Green Sky
32a8dba185
38e4c82fe0 feat: add ngc events 8099d82397 diagnostic: get the number of close dht nodes with announce/store support d01c116764 cleanup: make it more clear that assert and uint32_t increment both only exist if NDEBUG is not defined 58fac53429 refactor: Add a `bin_unpack_bin_max` for max-length arrays. 6be29f01e5 chore: Add more logging to loading conferences from savedata. 1195271b7f Fix inversed return values 82276ef5ac cleanup: Fix GCC compatibility. REVERT: 82460b2124 feat: add ngc events git-subtree-dir: external/toxcore/c-toxcore git-subtree-split: 38e4c82fe0fc373b9d43ee9ad2b8fe5fd1d26810
8418 lines
244 KiB
C
8418 lines
244 KiB
C
/* SPDX-License-Identifier: GPL-3.0-or-later
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* Copyright © 2016-2020 The TokTok team.
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* Copyright © 2015 Tox project.
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*/
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/**
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* An implementation of massive text only group chats.
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*/
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#include "group_chats.h"
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#include <assert.h>
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#ifndef VANILLA_NACL
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#include <sodium.h>
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#endif
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#include <string.h>
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#include "DHT.h"
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#include "LAN_discovery.h"
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#include "Messenger.h"
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#include "TCP_connection.h"
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#include "ccompat.h"
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#include "friend_connection.h"
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#include "group_common.h"
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#include "group_moderation.h"
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#include "group_pack.h"
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#include "mono_time.h"
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#include "network.h"
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#include "util.h"
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#ifndef VANILLA_NACL
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/* The minimum size of a plaintext group handshake packet */
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#define GC_MIN_HS_PACKET_PAYLOAD_SIZE (1 + ENC_PUBLIC_KEY_SIZE + SIG_PUBLIC_KEY_SIZE + 1 + 1)
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/* The minimum size of an encrypted group handshake packet. */
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#define GC_MIN_ENCRYPTED_HS_PAYLOAD_SIZE (1 + ENC_PUBLIC_KEY_SIZE + ENC_PUBLIC_KEY_SIZE +\
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GC_MIN_HS_PACKET_PAYLOAD_SIZE + CRYPTO_NONCE_SIZE + CRYPTO_MAC_SIZE)
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/* Size of a group's shared state in packed format */
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#define GC_PACKED_SHARED_STATE_SIZE (EXT_PUBLIC_KEY_SIZE + sizeof(uint16_t) + MAX_GC_GROUP_NAME_SIZE +\
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sizeof(uint16_t) + 1 + sizeof(uint16_t) + MAX_GC_PASSWORD_SIZE +\
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MOD_MODERATION_HASH_SIZE + sizeof(uint32_t) + sizeof(uint32_t) + 1)
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/* Minimum size of a topic packet; includes topic length, public signature key, topic version and checksum */
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#define GC_MIN_PACKED_TOPIC_INFO_SIZE (sizeof(uint16_t) + SIG_PUBLIC_KEY_SIZE + sizeof(uint32_t) + sizeof(uint16_t))
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#define GC_SHARED_STATE_ENC_PACKET_SIZE (SIGNATURE_SIZE + GC_PACKED_SHARED_STATE_SIZE)
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/* Header information attached to all broadcast messages: broadcast_type */
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#define GC_BROADCAST_ENC_HEADER_SIZE 1
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/* Size of a group packet message ID */
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#define GC_MESSAGE_ID_BYTES sizeof(uint64_t)
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/* Size of a lossless ack packet */
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#define GC_LOSSLESS_ACK_PACKET_SIZE (GC_MESSAGE_ID_BYTES + 1)
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/* Smallest possible size of an encrypted lossless payload.
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*
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* Data includes the message_id, group packet type, and the nonce and MAC for decryption.
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*/
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#define GC_MIN_LOSSLESS_PAYLOAD_SIZE (GC_MESSAGE_ID_BYTES + CRYPTO_NONCE_SIZE + 1 + CRYPTO_MAC_SIZE)
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/* Smallest possible size of a lossy group packet */
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#define GC_MIN_LOSSY_PAYLOAD_SIZE (GC_MIN_LOSSLESS_PAYLOAD_SIZE - GC_MESSAGE_ID_BYTES)
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/* Maximum number of bytes to pad packets with.
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*
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* Packets are padded with a random number of zero bytes between zero and this value in order to hide
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* the true length of the message, which reduces the amount of metadata leaked through packet analysis.
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*
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* Note: This behaviour was copied from the toxcore encryption implementation in net_crypto.c.
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*/
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#define GC_MAX_PACKET_PADDING 8
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/* Minimum size of a ping packet, which contains the peer count, peer list checksum, shared state version,
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* sanctions list version, sanctions list checksum, topic version, and topic checksum
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*/
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#define GC_PING_PACKET_MIN_DATA_SIZE ((sizeof(uint16_t) * 4) + (sizeof(uint32_t) * 3))
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/* How often in seconds we can send a group sync request packet */
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#define GC_SYNC_REQUEST_LIMIT (GC_PING_TIMEOUT + 1)
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/* How often in seconds we can send the peer list to any peer in the group in a sync response */
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#define GC_SYNC_RESPONSE_PEER_LIST_LIMIT 3
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/* How often in seconds we try to handshake with an unconfirmed peer */
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#define GC_SEND_HANDSHAKE_INTERVAL 3
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/* How often in seconds we rotate session encryption keys with a peer */
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#define GC_KEY_ROTATION_TIMEOUT (5 * 60)
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/* How often in seconds we try to reconnect to peers that recently timed out */
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#define GC_TIMED_OUT_RECONN_TIMEOUT (GC_UNCONFIRMED_PEER_TIMEOUT * 3)
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/* How long in seconds before we stop trying to reconnect with a timed out peer */
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#define GC_TIMED_OUT_STALE_TIMEOUT (60 * 15)
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/* The value the topic lock is set to when the topic lock is enabled. */
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#define GC_TOPIC_LOCK_ENABLED 0
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static_assert(GCC_BUFFER_SIZE <= UINT16_MAX,
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"GCC_BUFFER_SIZE must be <= UINT16_MAX)");
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static_assert(MAX_GC_PACKET_CHUNK_SIZE < MAX_GC_PACKET_SIZE,
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"MAX_GC_PACKET_CHUNK_SIZE must be < MAX_GC_PACKET_SIZE");
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// size of a lossless handshake packet - lossless packets can't/shouldn't be split up
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static_assert(MAX_GC_PACKET_CHUNK_SIZE >= 171,
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"MAX_GC_PACKET_CHUNK_SIZE must be >= 171");
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// group_moderation constants assume this is the max packet size.
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static_assert(MAX_GC_PACKET_SIZE >= 50000,
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"MAX_GC_PACKET_SIZE doesn't match constants in group_moderation.h");
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static_assert(MAX_GC_PACKET_SIZE <= UINT16_MAX - MAX_GC_PACKET_CHUNK_SIZE,
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"MAX_GC_PACKET_SIZE must be <= UINT16_MAX - MAX_GC_PACKET_CHUNK_SIZE");
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/** Types of broadcast messages. */
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typedef enum Group_Message_Type {
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GC_MESSAGE_TYPE_NORMAL = 0x00,
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GC_MESSAGE_TYPE_ACTION = 0x01,
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} Group_Message_Type;
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/** Types of handshake request packets. */
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typedef enum Group_Handshake_Packet_Type {
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GH_REQUEST = 0x00, // Requests a handshake
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GH_RESPONSE = 0x01, // Responds to a handshake request
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} Group_Handshake_Packet_Type;
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/** Types of handshake requests (within a handshake request packet). */
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typedef enum Group_Handshake_Request_Type {
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HS_INVITE_REQUEST = 0x00, // Requests an invite to the group
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HS_PEER_INFO_EXCHANGE = 0x01, // Requests a peer info exchange
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} Group_Handshake_Request_Type;
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/** These bitmasks determine what group state info a peer is requesting in a sync request */
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typedef enum Group_Sync_Flags {
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GF_PEERS = (1 << 0), // 1
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GF_TOPIC = (1 << 1), // 2
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GF_STATE = (1 << 2), // 4
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} Group_Sync_Flags;
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non_null() static bool self_gc_is_founder(const GC_Chat *chat);
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non_null() static bool group_number_valid(const GC_Session *c, int group_number);
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non_null() static int peer_update(const GC_Chat *chat, const GC_Peer *peer, uint32_t peer_number);
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non_null() static void group_delete(GC_Session *c, GC_Chat *chat);
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non_null() static void group_cleanup(GC_Session *c, GC_Chat *chat);
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non_null() static bool group_exists(const GC_Session *c, const uint8_t *chat_id);
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non_null() static void add_tcp_relays_to_chat(const GC_Session *c, GC_Chat *chat);
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non_null(1, 2) nullable(4)
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static bool peer_delete(const GC_Session *c, GC_Chat *chat, uint32_t peer_number, void *userdata);
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non_null() static void create_gc_session_keypair(const Logger *log, const Random *rng, uint8_t *public_key,
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uint8_t *secret_key);
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non_null() static size_t load_gc_peers(GC_Chat *chat, const GC_SavedPeerInfo *addrs, uint16_t num_addrs);
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non_null() static bool saved_peer_is_valid(const GC_SavedPeerInfo *saved_peer);
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static const GC_Chat empty_gc_chat = {nullptr};
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non_null()
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static void kill_group_friend_connection(const GC_Session *c, const GC_Chat *chat)
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{
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if (chat->friend_connection_id != -1) {
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m_kill_group_connection(c->messenger, chat);
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}
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}
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uint16_t gc_get_wrapped_packet_size(uint16_t length, Net_Packet_Type packet_type)
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{
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assert(length <= MAX_GC_PACKET_CHUNK_SIZE);
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const uint16_t min_header_size = packet_type == NET_PACKET_GC_LOSSY
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? GC_MIN_LOSSY_PAYLOAD_SIZE
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: GC_MIN_LOSSLESS_PAYLOAD_SIZE;
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const uint16_t header_size = ENC_PUBLIC_KEY_SIZE + GC_MAX_PACKET_PADDING + min_header_size;
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assert(length <= UINT16_MAX - header_size);
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return length + header_size;
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}
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/** Return true if `peer_number` is our own. */
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static bool peer_number_is_self(int peer_number)
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{
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return peer_number == 0;
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}
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bool gc_peer_number_is_valid(const GC_Chat *chat, int peer_number)
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{
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return peer_number >= 0 && peer_number < (int)chat->numpeers;
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}
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non_null()
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static GC_Peer *get_gc_peer(const GC_Chat *chat, int peer_number)
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{
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if (!gc_peer_number_is_valid(chat, peer_number)) {
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return nullptr;
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}
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return &chat->group[peer_number];
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}
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GC_Connection *get_gc_connection(const GC_Chat *chat, int peer_number)
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{
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GC_Peer *peer = get_gc_peer(chat, peer_number);
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if (peer == nullptr) {
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return nullptr;
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}
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return &peer->gconn;
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}
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/** Returns the amount of empty padding a packet of designated length should have. */
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static uint16_t group_packet_padding_length(uint16_t length)
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{
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return (MAX_GC_PACKET_CHUNK_SIZE - length) % GC_MAX_PACKET_PADDING;
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}
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void gc_get_self_nick(const GC_Chat *chat, uint8_t *nick)
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{
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if (nick != nullptr) {
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const GC_Peer *peer = get_gc_peer(chat, 0);
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assert(peer != nullptr);
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assert(peer->nick_length > 0);
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memcpy(nick, peer->nick, peer->nick_length);
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}
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}
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uint16_t gc_get_self_nick_size(const GC_Chat *chat)
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{
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const GC_Peer *peer = get_gc_peer(chat, 0);
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assert(peer != nullptr);
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return peer->nick_length;
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}
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/** @brief Sets self nick to `nick`.
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*
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* Returns false if `nick` is null or `length` is greater than MAX_GC_NICK_SIZE.
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*/
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non_null()
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static bool self_gc_set_nick(const GC_Chat *chat, const uint8_t *nick, uint16_t length)
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{
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if (nick == nullptr || length > MAX_GC_NICK_SIZE) {
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return false;
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}
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GC_Peer *peer = get_gc_peer(chat, 0);
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assert(peer != nullptr);
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memcpy(peer->nick, nick, length);
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peer->nick_length = length;
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return true;
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}
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Group_Role gc_get_self_role(const GC_Chat *chat)
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{
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const GC_Peer *peer = get_gc_peer(chat, 0);
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assert(peer != nullptr);
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return peer->role;
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}
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/** Sets self role. If role is invalid this function has no effect. */
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non_null()
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static void self_gc_set_role(const GC_Chat *chat, Group_Role role)
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{
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if (role <= GR_OBSERVER) {
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GC_Peer *peer = get_gc_peer(chat, 0);
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assert(peer != nullptr);
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peer->role = role;
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}
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}
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uint8_t gc_get_self_status(const GC_Chat *chat)
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{
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const GC_Peer *peer = get_gc_peer(chat, 0);
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assert(peer != nullptr);
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return peer->status;
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}
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/** Sets self status. If status is invalid this function has no effect. */
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non_null()
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static void self_gc_set_status(const GC_Chat *chat, Group_Peer_Status status)
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{
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if (status == GS_NONE || status == GS_AWAY || status == GS_BUSY) {
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GC_Peer *peer = get_gc_peer(chat, 0);
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assert(peer != nullptr);
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peer->status = status;
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return;
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}
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LOGGER_WARNING(chat->log, "Attempting to set user status with invalid status: %u", (uint8_t)status);
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}
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uint32_t gc_get_self_peer_id(const GC_Chat *chat)
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{
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const GC_Peer *peer = get_gc_peer(chat, 0);
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assert(peer != nullptr);
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return peer->peer_id;
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}
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/** Sets self confirmed status. */
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non_null()
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static void self_gc_set_confirmed(const GC_Chat *chat, bool confirmed)
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{
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GC_Connection *gconn = get_gc_connection(chat, 0);
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assert(gconn != nullptr);
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gconn->confirmed = confirmed;
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}
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/** Returns true if self has the founder role */
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non_null()
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static bool self_gc_is_founder(const GC_Chat *chat)
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{
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return gc_get_self_role(chat) == GR_FOUNDER;
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}
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void gc_get_self_public_key(const GC_Chat *chat, uint8_t *public_key)
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{
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if (public_key != nullptr) {
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memcpy(public_key, chat->self_public_key, ENC_PUBLIC_KEY_SIZE);
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}
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}
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/** @brief Sets self extended public key to `ext_public_key`.
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*
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* If `ext_public_key` is null this function has no effect.
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*/
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non_null()
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static void self_gc_set_ext_public_key(const GC_Chat *chat, const uint8_t *ext_public_key)
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{
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if (ext_public_key != nullptr) {
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GC_Connection *gconn = get_gc_connection(chat, 0);
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assert(gconn != nullptr);
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memcpy(gconn->addr.public_key, ext_public_key, EXT_PUBLIC_KEY_SIZE);
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}
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}
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/**
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* Return true if `peer` has permission to speak according to the `voice_state`.
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*/
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non_null()
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static bool peer_has_voice(const GC_Peer *peer, Group_Voice_State voice_state)
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{
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const Group_Role role = peer->role;
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switch (voice_state) {
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case GV_ALL:
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return role <= GR_USER;
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case GV_MODS:
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return role <= GR_MODERATOR;
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case GV_FOUNDER:
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return role == GR_FOUNDER;
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default:
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return false;
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}
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}
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int pack_gc_saved_peers(const GC_Chat *chat, uint8_t *data, uint16_t length, uint16_t *processed)
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{
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uint16_t packed_len = 0;
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uint16_t count = 0;
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for (uint32_t i = 0; i < GC_MAX_SAVED_PEERS; ++i) {
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const GC_SavedPeerInfo *saved_peer = &chat->saved_peers[i];
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if (!saved_peer_is_valid(saved_peer)) {
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continue;
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}
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int packed_ipp_len = 0;
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int packed_tcp_len = 0;
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if (ipport_isset(&saved_peer->ip_port)) {
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if (packed_len > length) {
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return -1;
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}
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packed_ipp_len = pack_ip_port(chat->log, data + packed_len, length - packed_len, &saved_peer->ip_port);
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if (packed_ipp_len > 0) {
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packed_len += packed_ipp_len;
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}
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}
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if (ipport_isset(&saved_peer->tcp_relay.ip_port)) {
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if (packed_len > length) {
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return -1;
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}
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packed_tcp_len = pack_nodes(chat->log, data + packed_len, length - packed_len, &saved_peer->tcp_relay, 1);
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if (packed_tcp_len > 0) {
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packed_len += packed_tcp_len;
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}
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}
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if (packed_len + ENC_PUBLIC_KEY_SIZE > length) {
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return -1;
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}
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if (packed_tcp_len > 0 || packed_ipp_len > 0) {
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memcpy(data + packed_len, chat->saved_peers[i].public_key, ENC_PUBLIC_KEY_SIZE);
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packed_len += ENC_PUBLIC_KEY_SIZE;
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++count;
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} else {
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LOGGER_WARNING(chat->log, "Failed to pack saved peer");
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}
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}
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if (processed != nullptr) {
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*processed = packed_len;
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}
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return count;
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}
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int unpack_gc_saved_peers(GC_Chat *chat, const uint8_t *data, uint16_t length)
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{
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uint16_t count = 0;
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uint16_t unpacked_len = 0;
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for (size_t i = 0; unpacked_len < length; ++i) {
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GC_SavedPeerInfo *saved_peer = &chat->saved_peers[i];
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const int ipp_len = unpack_ip_port(&saved_peer->ip_port, data + unpacked_len, length - unpacked_len, false);
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if (ipp_len > 0) {
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unpacked_len += ipp_len;
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}
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if (unpacked_len > length) {
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return -1;
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}
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uint16_t tcp_len_processed = 0;
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const int tcp_len = unpack_nodes(&saved_peer->tcp_relay, 1, &tcp_len_processed, data + unpacked_len,
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length - unpacked_len, true);
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if (tcp_len == 1 && tcp_len_processed > 0) {
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unpacked_len += tcp_len_processed;
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} else if (ipp_len <= 0) {
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LOGGER_WARNING(chat->log, "Failed to unpack saved peer: Invalid connection info.");
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return -1;
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}
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if (unpacked_len + ENC_PUBLIC_KEY_SIZE > length) {
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return -1;
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}
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if (tcp_len > 0 || ipp_len > 0) {
|
|
memcpy(saved_peer->public_key, data + unpacked_len, ENC_PUBLIC_KEY_SIZE);
|
|
unpacked_len += ENC_PUBLIC_KEY_SIZE;
|
|
++count;
|
|
} else {
|
|
LOGGER_ERROR(chat->log, "Unpacked peer with bad connection info");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
/** Returns true if chat privacy state is set to public. */
|
|
non_null()
|
|
static bool is_public_chat(const GC_Chat *chat)
|
|
{
|
|
return chat->shared_state.privacy_state == GI_PUBLIC;
|
|
}
|
|
|
|
/** Returns true if group is password protected */
|
|
non_null()
|
|
static bool chat_is_password_protected(const GC_Chat *chat)
|
|
{
|
|
return chat->shared_state.password_length > 0;
|
|
}
|
|
|
|
/** Returns true if `password` matches the current group password. */
|
|
non_null()
|
|
static bool validate_password(const GC_Chat *chat, const uint8_t *password, uint16_t length)
|
|
{
|
|
if (length > MAX_GC_PASSWORD_SIZE) {
|
|
return false;
|
|
}
|
|
|
|
if (length != chat->shared_state.password_length) {
|
|
return false;
|
|
}
|
|
|
|
return memcmp(chat->shared_state.password, password, length) == 0;
|
|
}
|
|
|
|
/** @brief Returns the chat object that contains a peer with a public key equal to `id`.
|
|
*
|
|
* `id` must be at least ENC_PUBLIC_KEY_SIZE bytes in length.
|
|
*/
|
|
non_null()
|
|
static GC_Chat *get_chat_by_id(const GC_Session *c, const uint8_t *id)
|
|
{
|
|
if (c == nullptr) {
|
|
return nullptr;
|
|
}
|
|
|
|
for (uint32_t i = 0; i < c->chats_index; ++i) {
|
|
GC_Chat *chat = &c->chats[i];
|
|
|
|
if (chat->connection_state == CS_NONE) {
|
|
continue;
|
|
}
|
|
|
|
if (memcmp(id, chat->self_public_key, ENC_PUBLIC_KEY_SIZE) == 0) {
|
|
return chat;
|
|
}
|
|
|
|
if (get_peer_number_of_enc_pk(chat, id, false) != -1) {
|
|
return chat;
|
|
}
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
/** @brief Returns the jenkins hash of a 32 byte public encryption key. */
|
|
uint32_t gc_get_pk_jenkins_hash(const uint8_t *public_key)
|
|
{
|
|
return jenkins_one_at_a_time_hash(public_key, ENC_PUBLIC_KEY_SIZE);
|
|
}
|
|
|
|
/** @brief Sets the sum of the public_key_hash of all confirmed peers.
|
|
*
|
|
* Must be called every time a peer is confirmed or deleted.
|
|
*/
|
|
non_null()
|
|
static void set_gc_peerlist_checksum(GC_Chat *chat)
|
|
{
|
|
uint16_t sum = 0;
|
|
|
|
for (uint32_t i = 0; i < chat->numpeers; ++i) {
|
|
const GC_Connection *gconn = get_gc_connection(chat, i);
|
|
|
|
assert(gconn != nullptr);
|
|
|
|
if (gconn->confirmed) {
|
|
sum += gconn->public_key_hash;
|
|
}
|
|
}
|
|
|
|
chat->peers_checksum = sum;
|
|
}
|
|
|
|
/** Returns a checksum of the topic currently set in `topic_info`. */
|
|
non_null()
|
|
static uint16_t get_gc_topic_checksum(const GC_TopicInfo *topic_info)
|
|
{
|
|
return data_checksum(topic_info->topic, topic_info->length);
|
|
}
|
|
|
|
int get_peer_number_of_enc_pk(const GC_Chat *chat, const uint8_t *public_enc_key, bool confirmed)
|
|
{
|
|
for (uint32_t i = 0; i < chat->numpeers; ++i) {
|
|
const GC_Connection *gconn = get_gc_connection(chat, i);
|
|
|
|
assert(gconn != nullptr);
|
|
|
|
if (gconn->pending_delete) {
|
|
continue;
|
|
}
|
|
|
|
if (confirmed && !gconn->confirmed) {
|
|
continue;
|
|
}
|
|
|
|
if (memcmp(gconn->addr.public_key, public_enc_key, ENC_PUBLIC_KEY_SIZE) == 0) {
|
|
return i;
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/** @brief Check if peer associated with `public_sig_key` is in peer list.
|
|
*
|
|
* Returns the peer number if peer is in the peer list.
|
|
* Returns -1 if peer is not in the peer list.
|
|
*/
|
|
non_null()
|
|
static int get_peer_number_of_sig_pk(const GC_Chat *chat, const uint8_t *public_sig_key)
|
|
{
|
|
for (uint32_t i = 0; i < chat->numpeers; ++i) {
|
|
const GC_Connection *gconn = get_gc_connection(chat, i);
|
|
|
|
assert(gconn != nullptr);
|
|
|
|
if (memcmp(get_sig_pk(gconn->addr.public_key), public_sig_key, SIG_PUBLIC_KEY_SIZE) == 0) {
|
|
return i;
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
non_null()
|
|
static bool gc_get_enc_pk_from_sig_pk(const GC_Chat *chat, uint8_t *public_key, const uint8_t *public_sig_key)
|
|
{
|
|
for (uint32_t i = 0; i < chat->numpeers; ++i) {
|
|
const GC_Connection *gconn = get_gc_connection(chat, i);
|
|
|
|
assert(gconn != nullptr);
|
|
|
|
const uint8_t *full_pk = gconn->addr.public_key;
|
|
|
|
if (memcmp(public_sig_key, get_sig_pk(full_pk), SIG_PUBLIC_KEY_SIZE) == 0) {
|
|
memcpy(public_key, get_enc_key(full_pk), ENC_PUBLIC_KEY_SIZE);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
non_null()
|
|
static GC_Connection *random_gc_connection(const GC_Chat *chat)
|
|
{
|
|
if (chat->numpeers <= 1) {
|
|
return nullptr;
|
|
}
|
|
|
|
const uint32_t base = random_range_u32(chat->rng, chat->numpeers - 1);
|
|
|
|
for (uint32_t i = 0; i < chat->numpeers - 1; ++i) {
|
|
const uint32_t index = 1 + (base + i) % (chat->numpeers - 1);
|
|
GC_Connection *rand_gconn = get_gc_connection(chat, index);
|
|
|
|
if (rand_gconn == nullptr) {
|
|
return nullptr;
|
|
}
|
|
|
|
if (!rand_gconn->pending_delete && rand_gconn->confirmed) {
|
|
return rand_gconn;
|
|
}
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
/** @brief Returns the peer number associated with peer_id.
|
|
* Returns -1 if peer_id is invalid.
|
|
*/
|
|
non_null()
|
|
static int get_peer_number_of_peer_id(const GC_Chat *chat, uint32_t peer_id)
|
|
{
|
|
for (uint32_t i = 0; i < chat->numpeers; ++i) {
|
|
if (chat->group[i].peer_id == peer_id) {
|
|
return i;
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/** @brief Returns a unique peer ID.
|
|
* Returns UINT32_MAX if all possible peer ID's are taken.
|
|
*
|
|
* These ID's are permanently assigned to a peer when they join the group and should be
|
|
* considered arbitrary values.
|
|
*/
|
|
non_null()
|
|
static uint32_t get_new_peer_id(const GC_Chat *chat)
|
|
{
|
|
for (uint32_t i = 0; i < UINT32_MAX - 1; ++i) {
|
|
if (get_peer_number_of_peer_id(chat, i) == -1) {
|
|
return i;
|
|
}
|
|
}
|
|
|
|
return UINT32_MAX;
|
|
}
|
|
|
|
/** @brief Sets the password for the group (locally only).
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null(1) nullable(2)
|
|
static bool set_gc_password_local(GC_Chat *chat, const uint8_t *passwd, uint16_t length)
|
|
{
|
|
if (length > MAX_GC_PASSWORD_SIZE) {
|
|
return false;
|
|
}
|
|
|
|
if (passwd == nullptr || length == 0) {
|
|
chat->shared_state.password_length = 0;
|
|
memset(chat->shared_state.password, 0, MAX_GC_PASSWORD_SIZE);
|
|
} else {
|
|
chat->shared_state.password_length = length;
|
|
crypto_memlock(chat->shared_state.password, sizeof(chat->shared_state.password));
|
|
memcpy(chat->shared_state.password, passwd, length);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Sets the local shared state to `version`.
|
|
*
|
|
* This should always be called instead of setting the variables manually.
|
|
*/
|
|
non_null()
|
|
static void set_gc_shared_state_version(GC_Chat *chat, uint32_t version)
|
|
{
|
|
chat->shared_state.version = version;
|
|
chat->moderation.shared_state_version = version;
|
|
}
|
|
|
|
/** @brief Expands the chat_id into the extended chat public key (encryption key + signature key).
|
|
*
|
|
* @param dest must have room for EXT_PUBLIC_KEY_SIZE bytes.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null()
|
|
static bool expand_chat_id(uint8_t *dest, const uint8_t *chat_id)
|
|
{
|
|
assert(dest != nullptr);
|
|
|
|
const int ret = crypto_sign_ed25519_pk_to_curve25519(dest, chat_id);
|
|
memcpy(dest + ENC_PUBLIC_KEY_SIZE, chat_id, SIG_PUBLIC_KEY_SIZE);
|
|
|
|
return ret != -1;
|
|
}
|
|
|
|
/** Copies peer connect info from `gconn` to `addr`. */
|
|
non_null()
|
|
static void copy_gc_saved_peer(const Random *rng, const GC_Connection *gconn, GC_SavedPeerInfo *addr)
|
|
{
|
|
if (!gcc_copy_tcp_relay(rng, &addr->tcp_relay, gconn)) {
|
|
addr->tcp_relay = (Node_format) {
|
|
0
|
|
};
|
|
}
|
|
|
|
addr->ip_port = gconn->addr.ip_port;
|
|
memcpy(addr->public_key, gconn->addr.public_key, ENC_PUBLIC_KEY_SIZE);
|
|
}
|
|
|
|
/** Return true if `saved_peer` has either a valid IP_Port or a valid TCP relay. */
|
|
non_null()
|
|
static bool saved_peer_is_valid(const GC_SavedPeerInfo *saved_peer)
|
|
{
|
|
return ipport_isset(&saved_peer->ip_port) || ipport_isset(&saved_peer->tcp_relay.ip_port);
|
|
}
|
|
|
|
/** @brief Returns the index of the saved peers entry for `public_key`.
|
|
* Returns -1 if key is not found.
|
|
*/
|
|
non_null()
|
|
static int saved_peer_index(const GC_Chat *chat, const uint8_t *public_key)
|
|
{
|
|
for (uint16_t i = 0; i < GC_MAX_SAVED_PEERS; ++i) {
|
|
const GC_SavedPeerInfo *saved_peer = &chat->saved_peers[i];
|
|
|
|
if (memcmp(saved_peer->public_key, public_key, ENC_PUBLIC_KEY_SIZE) == 0) {
|
|
return i;
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/** @brief Returns the index of the first vacant entry in saved peers list.
|
|
*
|
|
* If `public_key` is non-null and already exists in the list, its index will be returned.
|
|
*
|
|
* A vacant entry is an entry that does not have either an IP_port or tcp relay set (invalid),
|
|
* or an entry containing info on a peer that is not presently online (offline).
|
|
*
|
|
* Invalid entries are given priority over offline entries.
|
|
*
|
|
* Returns -1 if there are no vacant indices.
|
|
*/
|
|
non_null(1) nullable(2)
|
|
static int saved_peers_get_new_index(const GC_Chat *chat, const uint8_t *public_key)
|
|
{
|
|
if (public_key != nullptr) {
|
|
const int idx = saved_peer_index(chat, public_key);
|
|
|
|
if (idx != -1) {
|
|
return idx;
|
|
}
|
|
}
|
|
|
|
// first check for invalid spots
|
|
for (uint16_t i = 0; i < GC_MAX_SAVED_PEERS; ++i) {
|
|
const GC_SavedPeerInfo *saved_peer = &chat->saved_peers[i];
|
|
|
|
if (!saved_peer_is_valid(saved_peer)) {
|
|
return i;
|
|
}
|
|
}
|
|
|
|
// now look for entries with offline peers
|
|
for (uint16_t i = 0; i < GC_MAX_SAVED_PEERS; ++i) {
|
|
const GC_SavedPeerInfo *saved_peer = &chat->saved_peers[i];
|
|
|
|
const int peernumber = get_peer_number_of_enc_pk(chat, saved_peer->public_key, true);
|
|
|
|
if (peernumber < 0) {
|
|
return i;
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/** @brief Attempts to add `gconn` to the saved peer list.
|
|
*
|
|
* If an entry already exists it will be updated.
|
|
*
|
|
* Older peers will only be overwritten if the peer is no longer
|
|
* present in the chat. This gives priority to more stable connections.
|
|
*
|
|
* This function should be called every time a new peer joins the group.
|
|
*/
|
|
non_null()
|
|
static void add_gc_saved_peers(GC_Chat *chat, const GC_Connection *gconn)
|
|
{
|
|
const int idx = saved_peers_get_new_index(chat, gconn->addr.public_key);
|
|
|
|
if (idx == -1) {
|
|
return;
|
|
}
|
|
|
|
GC_SavedPeerInfo *saved_peer = &chat->saved_peers[idx];
|
|
copy_gc_saved_peer(chat->rng, gconn, saved_peer);
|
|
}
|
|
|
|
/** @brief Finds the first vacant spot in the saved peers list and fills it with a present
|
|
* peer who isn't already in the list.
|
|
*
|
|
* This function should be called after a confirmed peer exits the group.
|
|
*/
|
|
non_null()
|
|
static void refresh_gc_saved_peers(GC_Chat *chat)
|
|
{
|
|
const int idx = saved_peers_get_new_index(chat, nullptr);
|
|
|
|
if (idx == -1) {
|
|
return;
|
|
}
|
|
|
|
for (uint32_t i = 1; i < chat->numpeers; ++i) {
|
|
const GC_Connection *gconn = get_gc_connection(chat, i);
|
|
|
|
if (gconn == nullptr) {
|
|
continue;
|
|
}
|
|
|
|
if (!gconn->confirmed) {
|
|
continue;
|
|
}
|
|
|
|
if (saved_peer_index(chat, gconn->addr.public_key) == -1) {
|
|
GC_SavedPeerInfo *saved_peer = &chat->saved_peers[idx];
|
|
copy_gc_saved_peer(chat->rng, gconn, saved_peer);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/** Returns the number of confirmed peers in peerlist. */
|
|
non_null()
|
|
static uint16_t get_gc_confirmed_numpeers(const GC_Chat *chat)
|
|
{
|
|
uint16_t count = 0;
|
|
|
|
for (uint32_t i = 0; i < chat->numpeers; ++i) {
|
|
const GC_Connection *gconn = get_gc_connection(chat, i);
|
|
|
|
assert(gconn != nullptr);
|
|
|
|
if (gconn->confirmed) {
|
|
++count;
|
|
}
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
non_null() static bool sign_gc_shared_state(GC_Chat *chat);
|
|
non_null() static bool broadcast_gc_mod_list(const GC_Chat *chat);
|
|
non_null() static bool broadcast_gc_shared_state(const GC_Chat *chat);
|
|
non_null() static bool update_gc_sanctions_list(GC_Chat *chat, const uint8_t *public_sig_key);
|
|
non_null() static bool update_gc_topic(GC_Chat *chat, const uint8_t *public_sig_key);
|
|
non_null() static bool send_gc_set_observer(const GC_Chat *chat, const uint8_t *target_ext_pk,
|
|
const uint8_t *sanction_data, uint16_t length, bool add_obs);
|
|
|
|
/** Returns true if peer designated by `peer_number` is in the sanctions list as an observer. */
|
|
non_null()
|
|
static bool peer_is_observer(const GC_Chat *chat, uint32_t peer_number)
|
|
{
|
|
const GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
return sanctions_list_is_observer(&chat->moderation, get_enc_key(gconn->addr.public_key));
|
|
}
|
|
|
|
/** Returns true if peer designated by `peer_number` is the group founder. */
|
|
non_null()
|
|
static bool peer_is_founder(const GC_Chat *chat, uint32_t peer_number)
|
|
{
|
|
|
|
const GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
return memcmp(chat->shared_state.founder_public_key, gconn->addr.public_key, ENC_PUBLIC_KEY_SIZE) == 0;
|
|
}
|
|
|
|
/** Returns true if peer designated by `peer_number` is in the moderator list or is the founder. */
|
|
non_null()
|
|
static bool peer_is_moderator(const GC_Chat *chat, uint32_t peer_number)
|
|
{
|
|
const GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
if (peer_is_founder(chat, peer_number)) {
|
|
return false;
|
|
}
|
|
|
|
return mod_list_verify_sig_pk(&chat->moderation, get_sig_pk(gconn->addr.public_key));
|
|
}
|
|
|
|
/** @brief Iterates through the peerlist and updates group roles according to the
|
|
* current group state.
|
|
*
|
|
* Also updates the roles checksum. If any role conflicts exist the shared state
|
|
* version is set to zero in order to force a sync update.
|
|
*
|
|
* This should be called every time the moderator list or sanctions list changes,
|
|
* and after a new peer is marked as confirmed.
|
|
*/
|
|
non_null()
|
|
static void update_gc_peer_roles(GC_Chat *chat)
|
|
{
|
|
chat->roles_checksum = 0;
|
|
bool conflicts = false;
|
|
|
|
for (uint32_t i = 0; i < chat->numpeers; ++i) {
|
|
const GC_Connection *gconn = get_gc_connection(chat, i);
|
|
|
|
if (gconn == nullptr) {
|
|
continue;
|
|
}
|
|
|
|
if (!gconn->confirmed) {
|
|
continue;
|
|
}
|
|
|
|
const uint8_t first_byte = gconn->addr.public_key[0];
|
|
const bool is_founder = peer_is_founder(chat, i);
|
|
|
|
if (is_founder) {
|
|
chat->group[i].role = GR_FOUNDER;
|
|
chat->roles_checksum += GR_FOUNDER + first_byte;
|
|
continue;
|
|
}
|
|
|
|
const bool is_observer = peer_is_observer(chat, i);
|
|
const bool is_moderator = peer_is_moderator(chat, i);
|
|
const bool is_user = !(is_founder || is_moderator || is_observer);
|
|
|
|
if (is_observer && is_moderator) {
|
|
conflicts = true;
|
|
}
|
|
|
|
if (is_user) {
|
|
chat->group[i].role = GR_USER;
|
|
chat->roles_checksum += GR_USER + first_byte;
|
|
continue;
|
|
}
|
|
|
|
if (is_moderator) {
|
|
chat->group[i].role = GR_MODERATOR;
|
|
chat->roles_checksum += GR_MODERATOR + first_byte;
|
|
continue;
|
|
}
|
|
|
|
if (is_observer) {
|
|
chat->group[i].role = GR_OBSERVER;
|
|
chat->roles_checksum += GR_OBSERVER + first_byte;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (conflicts && !self_gc_is_founder(chat)) {
|
|
set_gc_shared_state_version(chat, 0); // need a new shared state
|
|
}
|
|
}
|
|
|
|
/** @brief Removes the first found offline mod from the mod list.
|
|
*
|
|
* Broadcasts the shared state and moderator list on success, as well as the updated
|
|
* sanctions list if necessary.
|
|
*
|
|
* TODO(Jfreegman): Make this smarter in who to remove (e.g. the mod who hasn't been seen online in the longest time)
|
|
*
|
|
* Returns false on failure.
|
|
*/
|
|
non_null()
|
|
static bool prune_gc_mod_list(GC_Chat *chat)
|
|
{
|
|
if (chat->moderation.num_mods == 0) {
|
|
return true;
|
|
}
|
|
|
|
uint8_t public_sig_key[SIG_PUBLIC_KEY_SIZE];
|
|
bool pruned_mod = false;
|
|
|
|
for (uint16_t i = 0; i < chat->moderation.num_mods; ++i) {
|
|
if (get_peer_number_of_sig_pk(chat, chat->moderation.mod_list[i]) == -1) {
|
|
memcpy(public_sig_key, chat->moderation.mod_list[i], SIG_PUBLIC_KEY_SIZE);
|
|
|
|
if (!mod_list_remove_index(&chat->moderation, i)) {
|
|
continue;
|
|
}
|
|
|
|
pruned_mod = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return pruned_mod
|
|
&& mod_list_make_hash(&chat->moderation, chat->shared_state.mod_list_hash)
|
|
&& sign_gc_shared_state(chat)
|
|
&& broadcast_gc_shared_state(chat)
|
|
&& broadcast_gc_mod_list(chat)
|
|
&& update_gc_sanctions_list(chat, public_sig_key)
|
|
&& update_gc_topic(chat, public_sig_key);
|
|
}
|
|
|
|
/** @brief Removes the first found offline sanctioned peer from the sanctions list and sends the
|
|
* event to the rest of the group.
|
|
*
|
|
* @retval false on failure or if no presently sanctioned peer is offline.
|
|
*/
|
|
non_null()
|
|
static bool prune_gc_sanctions_list(GC_Chat *chat)
|
|
{
|
|
if (chat->moderation.num_sanctions == 0) {
|
|
return true;
|
|
}
|
|
|
|
const Mod_Sanction *sanction = nullptr;
|
|
uint8_t target_ext_pk[ENC_PUBLIC_KEY_SIZE + SIG_PUBLIC_KEY_SIZE];
|
|
|
|
for (uint16_t i = 0; i < chat->moderation.num_sanctions; ++i) {
|
|
const int peer_number = get_peer_number_of_enc_pk(chat, chat->moderation.sanctions[i].target_public_enc_key, true);
|
|
|
|
if (peer_number == -1) {
|
|
sanction = &chat->moderation.sanctions[i];
|
|
memcpy(target_ext_pk, sanction->target_public_enc_key, ENC_PUBLIC_KEY_SIZE);
|
|
memcpy(target_ext_pk + ENC_PUBLIC_KEY_SIZE, sanction->setter_public_sig_key, SIG_PUBLIC_KEY_SIZE);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (sanction == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
if (!sanctions_list_remove_observer(&chat->moderation, sanction->target_public_enc_key, nullptr)) {
|
|
LOGGER_WARNING(chat->log, "Failed to remove entry from observer list");
|
|
return false;
|
|
}
|
|
|
|
sanction = nullptr;
|
|
|
|
uint8_t data[MOD_SANCTIONS_CREDS_SIZE];
|
|
const uint16_t length = sanctions_creds_pack(&chat->moderation.sanctions_creds, data);
|
|
|
|
if (length != MOD_SANCTIONS_CREDS_SIZE) {
|
|
LOGGER_ERROR(chat->log, "Failed to pack credentials (invalid length: %u)", length);
|
|
return false;
|
|
}
|
|
|
|
if (!send_gc_set_observer(chat, target_ext_pk, data, length, false)) {
|
|
LOGGER_WARNING(chat->log, "Failed to broadcast set observer");
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Size of peer data that we pack for transfer (nick length must be accounted for separately).
|
|
* packed data consists of: nick length, nick, and status.
|
|
*/
|
|
#define PACKED_GC_PEER_SIZE (sizeof(uint16_t) + MAX_GC_NICK_SIZE + sizeof(uint8_t))
|
|
|
|
/** @brief Packs peer info into data of maxlength length.
|
|
*
|
|
* Return length of packed peer on success.
|
|
* Return -1 on failure.
|
|
*/
|
|
non_null()
|
|
static int pack_gc_peer(uint8_t *data, uint16_t length, const GC_Peer *peer)
|
|
{
|
|
if (PACKED_GC_PEER_SIZE > length) {
|
|
return -1;
|
|
}
|
|
|
|
uint32_t packed_len = 0;
|
|
|
|
net_pack_u16(data + packed_len, peer->nick_length);
|
|
packed_len += sizeof(uint16_t);
|
|
memcpy(data + packed_len, peer->nick, MAX_GC_NICK_SIZE);
|
|
packed_len += MAX_GC_NICK_SIZE;
|
|
memcpy(data + packed_len, &peer->status, sizeof(uint8_t));
|
|
packed_len += sizeof(uint8_t);
|
|
|
|
return packed_len;
|
|
}
|
|
|
|
/** @brief Unpacks peer info of size length into peer.
|
|
*
|
|
* Returns the length of processed data on success.
|
|
* Returns -1 on failure.
|
|
*/
|
|
non_null()
|
|
static int unpack_gc_peer(GC_Peer *peer, const uint8_t *data, uint16_t length)
|
|
{
|
|
if (PACKED_GC_PEER_SIZE > length) {
|
|
return -1;
|
|
}
|
|
|
|
uint16_t len_processed = 0;
|
|
|
|
net_unpack_u16(data + len_processed, &peer->nick_length);
|
|
len_processed += sizeof(uint16_t);
|
|
peer->nick_length = min_u16(MAX_GC_NICK_SIZE, peer->nick_length);
|
|
memcpy(peer->nick, data + len_processed, MAX_GC_NICK_SIZE);
|
|
len_processed += MAX_GC_NICK_SIZE;
|
|
memcpy(&peer->status, data + len_processed, sizeof(uint8_t));
|
|
len_processed += sizeof(uint8_t);
|
|
|
|
return len_processed;
|
|
}
|
|
|
|
/** @brief Packs shared_state into data.
|
|
*
|
|
* @param data must have room for at least GC_PACKED_SHARED_STATE_SIZE bytes.
|
|
*
|
|
* Returns packed data length.
|
|
*/
|
|
non_null()
|
|
static uint16_t pack_gc_shared_state(uint8_t *data, uint16_t length, const GC_SharedState *shared_state)
|
|
{
|
|
if (length < GC_PACKED_SHARED_STATE_SIZE) {
|
|
return 0;
|
|
}
|
|
|
|
const uint8_t privacy_state = shared_state->privacy_state;
|
|
const uint8_t voice_state = shared_state->voice_state;
|
|
|
|
uint16_t packed_len = 0;
|
|
|
|
// version is always first
|
|
net_pack_u32(data + packed_len, shared_state->version);
|
|
packed_len += sizeof(uint32_t);
|
|
|
|
memcpy(data + packed_len, shared_state->founder_public_key, EXT_PUBLIC_KEY_SIZE);
|
|
packed_len += EXT_PUBLIC_KEY_SIZE;
|
|
net_pack_u16(data + packed_len, shared_state->maxpeers);
|
|
packed_len += sizeof(uint16_t);
|
|
net_pack_u16(data + packed_len, shared_state->group_name_len);
|
|
packed_len += sizeof(uint16_t);
|
|
memcpy(data + packed_len, shared_state->group_name, MAX_GC_GROUP_NAME_SIZE);
|
|
packed_len += MAX_GC_GROUP_NAME_SIZE;
|
|
memcpy(data + packed_len, &privacy_state, sizeof(uint8_t));
|
|
packed_len += sizeof(uint8_t);
|
|
net_pack_u16(data + packed_len, shared_state->password_length);
|
|
packed_len += sizeof(uint16_t);
|
|
memcpy(data + packed_len, shared_state->password, MAX_GC_PASSWORD_SIZE);
|
|
packed_len += MAX_GC_PASSWORD_SIZE;
|
|
memcpy(data + packed_len, shared_state->mod_list_hash, MOD_MODERATION_HASH_SIZE);
|
|
packed_len += MOD_MODERATION_HASH_SIZE;
|
|
net_pack_u32(data + packed_len, shared_state->topic_lock);
|
|
packed_len += sizeof(uint32_t);
|
|
memcpy(data + packed_len, &voice_state, sizeof(uint8_t));
|
|
packed_len += sizeof(uint8_t);
|
|
|
|
return packed_len;
|
|
}
|
|
|
|
/** @brief Unpacks shared state data into shared_state.
|
|
*
|
|
* @param data must contain at least GC_PACKED_SHARED_STATE_SIZE bytes.
|
|
*
|
|
* Returns the length of processed data.
|
|
*/
|
|
non_null()
|
|
static uint16_t unpack_gc_shared_state(GC_SharedState *shared_state, const uint8_t *data, uint16_t length)
|
|
{
|
|
if (length < GC_PACKED_SHARED_STATE_SIZE) {
|
|
return 0;
|
|
}
|
|
|
|
uint16_t len_processed = 0;
|
|
|
|
// version is always first
|
|
net_unpack_u32(data + len_processed, &shared_state->version);
|
|
len_processed += sizeof(uint32_t);
|
|
|
|
memcpy(shared_state->founder_public_key, data + len_processed, EXT_PUBLIC_KEY_SIZE);
|
|
len_processed += EXT_PUBLIC_KEY_SIZE;
|
|
net_unpack_u16(data + len_processed, &shared_state->maxpeers);
|
|
len_processed += sizeof(uint16_t);
|
|
net_unpack_u16(data + len_processed, &shared_state->group_name_len);
|
|
shared_state->group_name_len = min_u16(shared_state->group_name_len, MAX_GC_GROUP_NAME_SIZE);
|
|
len_processed += sizeof(uint16_t);
|
|
memcpy(shared_state->group_name, data + len_processed, MAX_GC_GROUP_NAME_SIZE);
|
|
len_processed += MAX_GC_GROUP_NAME_SIZE;
|
|
|
|
uint8_t privacy_state;
|
|
memcpy(&privacy_state, data + len_processed, sizeof(uint8_t));
|
|
len_processed += sizeof(uint8_t);
|
|
|
|
net_unpack_u16(data + len_processed, &shared_state->password_length);
|
|
len_processed += sizeof(uint16_t);
|
|
memcpy(shared_state->password, data + len_processed, MAX_GC_PASSWORD_SIZE);
|
|
len_processed += MAX_GC_PASSWORD_SIZE;
|
|
memcpy(shared_state->mod_list_hash, data + len_processed, MOD_MODERATION_HASH_SIZE);
|
|
len_processed += MOD_MODERATION_HASH_SIZE;
|
|
net_unpack_u32(data + len_processed, &shared_state->topic_lock);
|
|
len_processed += sizeof(uint32_t);
|
|
|
|
uint8_t voice_state;
|
|
memcpy(&voice_state, data + len_processed, sizeof(uint8_t));
|
|
len_processed += sizeof(uint8_t);
|
|
|
|
shared_state->voice_state = (Group_Voice_State)voice_state;
|
|
shared_state->privacy_state = (Group_Privacy_State)privacy_state;
|
|
|
|
return len_processed;
|
|
}
|
|
|
|
/** @brief Packs topic info into data.
|
|
*
|
|
* @param data must have room for at least topic length + GC_MIN_PACKED_TOPIC_INFO_SIZE bytes.
|
|
*
|
|
* Returns packed data length.
|
|
*/
|
|
non_null()
|
|
static uint16_t pack_gc_topic_info(uint8_t *data, uint16_t length, const GC_TopicInfo *topic_info)
|
|
{
|
|
if (length < topic_info->length + GC_MIN_PACKED_TOPIC_INFO_SIZE) {
|
|
return 0;
|
|
}
|
|
|
|
uint16_t packed_len = 0;
|
|
|
|
net_pack_u32(data + packed_len, topic_info->version);
|
|
packed_len += sizeof(uint32_t);
|
|
net_pack_u16(data + packed_len, topic_info->checksum);
|
|
packed_len += sizeof(uint16_t);
|
|
net_pack_u16(data + packed_len, topic_info->length);
|
|
packed_len += sizeof(uint16_t);
|
|
memcpy(data + packed_len, topic_info->topic, topic_info->length);
|
|
packed_len += topic_info->length;
|
|
memcpy(data + packed_len, topic_info->public_sig_key, SIG_PUBLIC_KEY_SIZE);
|
|
packed_len += SIG_PUBLIC_KEY_SIZE;
|
|
|
|
return packed_len;
|
|
}
|
|
|
|
/** @brief Unpacks topic info into `topic_info`.
|
|
*
|
|
* Returns -1 on failure.
|
|
* Returns the length of the processed data on success.
|
|
*/
|
|
non_null()
|
|
static int unpack_gc_topic_info(GC_TopicInfo *topic_info, const uint8_t *data, uint16_t length)
|
|
{
|
|
if (length < sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t)) {
|
|
return -1;
|
|
}
|
|
|
|
uint16_t len_processed = 0;
|
|
|
|
net_unpack_u32(data + len_processed, &topic_info->version);
|
|
len_processed += sizeof(uint32_t);
|
|
net_unpack_u16(data + len_processed, &topic_info->checksum);
|
|
len_processed += sizeof(uint16_t);
|
|
net_unpack_u16(data + len_processed, &topic_info->length);
|
|
len_processed += sizeof(uint16_t);
|
|
|
|
if (topic_info->length > MAX_GC_TOPIC_SIZE) {
|
|
topic_info->length = MAX_GC_TOPIC_SIZE;
|
|
}
|
|
|
|
if (length - len_processed < topic_info->length + SIG_PUBLIC_KEY_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
if (topic_info->length > 0) {
|
|
memcpy(topic_info->topic, data + len_processed, topic_info->length);
|
|
len_processed += topic_info->length;
|
|
}
|
|
|
|
memcpy(topic_info->public_sig_key, data + len_processed, SIG_PUBLIC_KEY_SIZE);
|
|
len_processed += SIG_PUBLIC_KEY_SIZE;
|
|
|
|
return len_processed;
|
|
}
|
|
|
|
/** @brief Creates a shared state packet and puts it in data.
|
|
* Packet includes self pk hash, shared state signature, and packed shared state info.
|
|
* data must have room for at least GC_SHARED_STATE_ENC_PACKET_SIZE bytes.
|
|
*
|
|
* Returns packet length on success.
|
|
* Returns -1 on failure.
|
|
*/
|
|
non_null()
|
|
static int make_gc_shared_state_packet(const GC_Chat *chat, uint8_t *data, uint16_t length)
|
|
{
|
|
if (length < GC_SHARED_STATE_ENC_PACKET_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
memcpy(data, chat->shared_state_sig, SIGNATURE_SIZE);
|
|
const uint16_t header_len = SIGNATURE_SIZE;
|
|
|
|
const uint16_t packed_len = pack_gc_shared_state(data + header_len, length - header_len, &chat->shared_state);
|
|
|
|
if (packed_len != GC_PACKED_SHARED_STATE_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
return (int)(header_len + packed_len);
|
|
}
|
|
|
|
/** @brief Creates a signature for the group's shared state in packed form.
|
|
*
|
|
* This function only works for the Founder.
|
|
*
|
|
* Returns true on success and increments the shared state version.
|
|
*/
|
|
non_null()
|
|
static bool sign_gc_shared_state(GC_Chat *chat)
|
|
{
|
|
if (!self_gc_is_founder(chat)) {
|
|
LOGGER_ERROR(chat->log, "Failed to sign shared state (invalid permission)");
|
|
return false;
|
|
}
|
|
|
|
if (chat->shared_state.version != UINT32_MAX) {
|
|
/* improbable, but an overflow would break everything */
|
|
set_gc_shared_state_version(chat, chat->shared_state.version + 1);
|
|
} else {
|
|
LOGGER_WARNING(chat->log, "Shared state version wraparound");
|
|
}
|
|
|
|
uint8_t shared_state[GC_PACKED_SHARED_STATE_SIZE];
|
|
const uint16_t packed_len = pack_gc_shared_state(shared_state, sizeof(shared_state), &chat->shared_state);
|
|
|
|
if (packed_len != GC_PACKED_SHARED_STATE_SIZE) {
|
|
set_gc_shared_state_version(chat, chat->shared_state.version - 1);
|
|
LOGGER_ERROR(chat->log, "Failed to pack shared state");
|
|
return false;
|
|
}
|
|
|
|
const int ret = crypto_sign_detached(chat->shared_state_sig, nullptr, shared_state, packed_len,
|
|
get_sig_sk(chat->chat_secret_key));
|
|
|
|
if (ret != 0) {
|
|
set_gc_shared_state_version(chat, chat->shared_state.version - 1);
|
|
LOGGER_ERROR(chat->log, "Failed to sign shared state (%d)", ret);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Decrypts data using the shared key associated with `gconn`.
|
|
*
|
|
* The packet payload should begin with a nonce.
|
|
*
|
|
* @param message_id should be set to NULL for lossy packets.
|
|
*
|
|
* Returns length of the plaintext data on success.
|
|
* Return -1 if encrypted payload length is invalid.
|
|
* Return -2 on decryption failure.
|
|
* Return -3 if plaintext payload length is invalid.
|
|
*/
|
|
non_null(1, 2, 3, 5, 6) nullable(4)
|
|
static int group_packet_unwrap(const Logger *log, const GC_Connection *gconn, uint8_t *data, uint64_t *message_id,
|
|
uint8_t *packet_type, const uint8_t *packet, uint16_t length)
|
|
{
|
|
if (length <= CRYPTO_NONCE_SIZE) {
|
|
LOGGER_FATAL(log, "Invalid packet length: %u", length);
|
|
return -1;
|
|
}
|
|
|
|
uint8_t *plain = (uint8_t *)malloc(length);
|
|
|
|
if (plain == nullptr) {
|
|
LOGGER_ERROR(log, "Failed to allocate memory for plain data buffer");
|
|
return -1;
|
|
}
|
|
|
|
int plain_len = decrypt_data_symmetric(gconn->session_shared_key, packet, packet + CRYPTO_NONCE_SIZE,
|
|
length - CRYPTO_NONCE_SIZE, plain);
|
|
|
|
if (plain_len <= 0) {
|
|
free(plain);
|
|
return plain_len == 0 ? -3 : -2;
|
|
}
|
|
|
|
const int min_plain_len = message_id != nullptr ? 1 + GC_MESSAGE_ID_BYTES : 1;
|
|
|
|
/* remove padding */
|
|
const uint8_t *real_plain = plain;
|
|
|
|
while (real_plain[0] == 0) {
|
|
++real_plain;
|
|
--plain_len;
|
|
|
|
if (plain_len < min_plain_len) {
|
|
free(plain);
|
|
return -3;
|
|
}
|
|
}
|
|
|
|
uint32_t header_len = sizeof(uint8_t);
|
|
*packet_type = real_plain[0];
|
|
plain_len -= sizeof(uint8_t);
|
|
|
|
if (message_id != nullptr) {
|
|
net_unpack_u64(real_plain + sizeof(uint8_t), message_id);
|
|
plain_len -= GC_MESSAGE_ID_BYTES;
|
|
header_len += GC_MESSAGE_ID_BYTES;
|
|
}
|
|
|
|
memcpy(data, real_plain + header_len, plain_len);
|
|
|
|
free(plain);
|
|
|
|
return plain_len;
|
|
}
|
|
|
|
int group_packet_wrap(
|
|
const Logger *log, const Random *rng, const uint8_t *self_pk, const uint8_t *shared_key, uint8_t *packet,
|
|
uint16_t packet_size, const uint8_t *data, uint16_t length, uint64_t message_id,
|
|
uint8_t gp_packet_type, uint8_t net_packet_type)
|
|
{
|
|
const uint16_t padding_len = group_packet_padding_length(length);
|
|
const uint16_t min_packet_size = net_packet_type == NET_PACKET_GC_LOSSLESS
|
|
? length + padding_len + CRYPTO_MAC_SIZE + 1 + ENC_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE + GC_MESSAGE_ID_BYTES + 1
|
|
: length + padding_len + CRYPTO_MAC_SIZE + 1 + ENC_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE + 1;
|
|
|
|
if (min_packet_size > packet_size) {
|
|
LOGGER_ERROR(log, "Invalid packet buffer size: %u", packet_size);
|
|
return -1;
|
|
}
|
|
|
|
if (length > MAX_GC_PACKET_CHUNK_SIZE) {
|
|
LOGGER_ERROR(log, "Packet payload size (%u) exceeds maximum (%u)", length, MAX_GC_PACKET_CHUNK_SIZE);
|
|
return -1;
|
|
}
|
|
|
|
uint8_t *plain = (uint8_t *)malloc(packet_size);
|
|
|
|
if (plain == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
assert(padding_len < packet_size);
|
|
|
|
memset(plain, 0, padding_len);
|
|
|
|
uint16_t enc_header_len = sizeof(uint8_t);
|
|
plain[padding_len] = gp_packet_type;
|
|
|
|
if (net_packet_type == NET_PACKET_GC_LOSSLESS) {
|
|
net_pack_u64(plain + padding_len + sizeof(uint8_t), message_id);
|
|
enc_header_len += GC_MESSAGE_ID_BYTES;
|
|
}
|
|
|
|
if (length > 0 && data != nullptr) {
|
|
memcpy(plain + padding_len + enc_header_len, data, length);
|
|
}
|
|
|
|
uint8_t nonce[CRYPTO_NONCE_SIZE];
|
|
random_nonce(rng, nonce);
|
|
|
|
const uint16_t plain_len = padding_len + enc_header_len + length;
|
|
const uint16_t encrypt_buf_size = plain_len + CRYPTO_MAC_SIZE;
|
|
|
|
uint8_t *encrypt = (uint8_t *)malloc(encrypt_buf_size);
|
|
|
|
if (encrypt == nullptr) {
|
|
free(plain);
|
|
return -2;
|
|
}
|
|
|
|
const int enc_len = encrypt_data_symmetric(shared_key, nonce, plain, plain_len, encrypt);
|
|
|
|
free(plain);
|
|
|
|
if (enc_len != encrypt_buf_size) {
|
|
LOGGER_ERROR(log, "encryption failed. packet type: 0x%02x, enc_len: %d", gp_packet_type, enc_len);
|
|
free(encrypt);
|
|
return -3;
|
|
}
|
|
|
|
packet[0] = net_packet_type;
|
|
memcpy(packet + 1, self_pk, ENC_PUBLIC_KEY_SIZE);
|
|
memcpy(packet + 1 + ENC_PUBLIC_KEY_SIZE, nonce, CRYPTO_NONCE_SIZE);
|
|
memcpy(packet + 1 + ENC_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE, encrypt, enc_len);
|
|
|
|
free(encrypt);
|
|
|
|
return 1 + ENC_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE + enc_len;
|
|
}
|
|
|
|
/** @brief Sends a lossy packet to peer_number in chat instance.
|
|
*
|
|
* Returns true on success.
|
|
*/
|
|
non_null()
|
|
static bool send_lossy_group_packet(const GC_Chat *chat, const GC_Connection *gconn, const uint8_t *data,
|
|
uint16_t length, uint8_t packet_type)
|
|
{
|
|
assert(length <= MAX_GC_PACKET_CHUNK_SIZE);
|
|
|
|
if (!gconn->handshaked || gconn->pending_delete) {
|
|
return false;
|
|
}
|
|
|
|
if (data == nullptr || length == 0) {
|
|
return false;
|
|
}
|
|
|
|
const uint16_t packet_size = gc_get_wrapped_packet_size(length, NET_PACKET_GC_LOSSY);
|
|
uint8_t *packet = (uint8_t *)malloc(packet_size);
|
|
|
|
if (packet == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
const int len = group_packet_wrap(
|
|
chat->log, chat->rng, chat->self_public_key, gconn->session_shared_key, packet,
|
|
packet_size, data, length, 0, packet_type, NET_PACKET_GC_LOSSY);
|
|
|
|
if (len < 0) {
|
|
LOGGER_ERROR(chat->log, "Failed to encrypt packet (type: 0x%02x, error: %d)", packet_type, len);
|
|
free(packet);
|
|
return false;
|
|
}
|
|
|
|
const bool ret = gcc_send_packet(chat, gconn, packet, (uint16_t)len);
|
|
|
|
free(packet);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/** @brief Sends a lossless packet to peer_number in chat instance.
|
|
*
|
|
* Returns true on success.
|
|
*/
|
|
non_null(1, 2) nullable(3)
|
|
static bool send_lossless_group_packet(const GC_Chat *chat, GC_Connection *gconn, const uint8_t *data, uint16_t length,
|
|
uint8_t packet_type)
|
|
{
|
|
assert(length <= MAX_GC_PACKET_SIZE);
|
|
|
|
if (!gconn->handshaked || gconn->pending_delete) {
|
|
return false;
|
|
}
|
|
|
|
if (length > MAX_GC_PACKET_CHUNK_SIZE) {
|
|
return gcc_send_lossless_packet_fragments(chat, gconn, data, length, packet_type);
|
|
}
|
|
|
|
return gcc_send_lossless_packet(chat, gconn, data, length, packet_type) == 0;
|
|
}
|
|
|
|
/** @brief Sends a group sync request to peer.
|
|
*
|
|
* Returns true on success or if sync request timeout has not expired.
|
|
*/
|
|
non_null()
|
|
static bool send_gc_sync_request(GC_Chat *chat, GC_Connection *gconn, uint16_t sync_flags)
|
|
{
|
|
if (!mono_time_is_timeout(chat->mono_time, chat->last_sync_request, GC_SYNC_REQUEST_LIMIT)) {
|
|
return true;
|
|
}
|
|
|
|
chat->last_sync_request = mono_time_get(chat->mono_time);
|
|
|
|
uint8_t data[(sizeof(uint16_t) * 2) + MAX_GC_PASSWORD_SIZE];
|
|
uint16_t length = sizeof(uint16_t);
|
|
|
|
net_pack_u16(data, sync_flags);
|
|
|
|
if (chat_is_password_protected(chat)) {
|
|
net_pack_u16(data + length, chat->shared_state.password_length);
|
|
length += sizeof(uint16_t);
|
|
|
|
memcpy(data + length, chat->shared_state.password, MAX_GC_PASSWORD_SIZE);
|
|
length += MAX_GC_PASSWORD_SIZE;
|
|
}
|
|
|
|
return send_lossless_group_packet(chat, gconn, data, length, GP_SYNC_REQUEST);
|
|
}
|
|
|
|
/** @brief Sends a sync response packet to peer designated by `gconn`.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null(1, 2) nullable(3)
|
|
static bool send_gc_sync_response(const GC_Chat *chat, GC_Connection *gconn, const uint8_t *data, uint16_t length)
|
|
{
|
|
return send_lossless_group_packet(chat, gconn, data, length, GP_SYNC_RESPONSE);
|
|
}
|
|
|
|
non_null() static bool send_gc_peer_exchange(const GC_Chat *chat, GC_Connection *gconn);
|
|
non_null() static bool send_gc_handshake_packet(const GC_Chat *chat, GC_Connection *gconn, uint8_t handshake_type,
|
|
uint8_t request_type, uint8_t join_type);
|
|
non_null() static bool send_gc_oob_handshake_request(const GC_Chat *chat, const GC_Connection *gconn);
|
|
|
|
/** @brief Unpacks a sync announce.
|
|
*
|
|
* If the announced peer is not already in our peer list, we attempt to
|
|
* initiate a peer info exchange with them.
|
|
*
|
|
* Return true on success (whether or not the peer was added).
|
|
*/
|
|
non_null()
|
|
static bool unpack_gc_sync_announce(GC_Chat *chat, const uint8_t *data, const uint16_t length)
|
|
{
|
|
GC_Announce announce = {0};
|
|
|
|
const int unpacked_announces = gca_unpack_announces_list(chat->log, data, length, &announce, 1);
|
|
|
|
if (unpacked_announces <= 0) {
|
|
LOGGER_WARNING(chat->log, "Failed to unpack announces: %d", unpacked_announces);
|
|
return false;
|
|
}
|
|
|
|
if (memcmp(announce.peer_public_key, chat->self_public_key, ENC_PUBLIC_KEY_SIZE) == 0) {
|
|
LOGGER_WARNING(chat->log, "Attempted to unpack our own announce");
|
|
return true;
|
|
}
|
|
|
|
if (!gca_is_valid_announce(&announce)) {
|
|
LOGGER_WARNING(chat->log, "got invalid announce");
|
|
return false;
|
|
}
|
|
|
|
const IP_Port *ip_port = announce.ip_port_is_set ? &announce.ip_port : nullptr;
|
|
const int new_peer_number = peer_add(chat, ip_port, announce.peer_public_key);
|
|
|
|
if (new_peer_number == -1) {
|
|
LOGGER_ERROR(chat->log, "peer_add() failed");
|
|
return false;
|
|
}
|
|
|
|
if (new_peer_number == -2) { // peer already added
|
|
return true;
|
|
}
|
|
|
|
if (new_peer_number > 0) {
|
|
GC_Connection *new_gconn = get_gc_connection(chat, new_peer_number);
|
|
|
|
if (new_gconn == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
uint32_t added_tcp_relays = 0;
|
|
|
|
for (uint8_t i = 0; i < announce.tcp_relays_count; ++i) {
|
|
const int add_tcp_result = add_tcp_relay_connection(chat->tcp_conn, new_gconn->tcp_connection_num,
|
|
&announce.tcp_relays[i].ip_port,
|
|
announce.tcp_relays[i].public_key);
|
|
|
|
if (add_tcp_result == -1) {
|
|
continue;
|
|
}
|
|
|
|
if (gcc_save_tcp_relay(chat->rng, new_gconn, &announce.tcp_relays[i]) == 0) {
|
|
++added_tcp_relays;
|
|
}
|
|
}
|
|
|
|
if (!announce.ip_port_is_set && added_tcp_relays == 0) {
|
|
gcc_mark_for_deletion(new_gconn, chat->tcp_conn, GC_EXIT_TYPE_DISCONNECTED, nullptr, 0);
|
|
LOGGER_ERROR(chat->log, "Sync error: Invalid peer connection info");
|
|
return false;
|
|
}
|
|
|
|
new_gconn->pending_handshake_type = HS_PEER_INFO_EXCHANGE;
|
|
|
|
return true;
|
|
}
|
|
|
|
LOGGER_FATAL(chat->log, "got impossible return value %d", new_peer_number);
|
|
|
|
return false;
|
|
}
|
|
|
|
/** @brief Handles a sync response packet.
|
|
*
|
|
* Note: This function may change peer numbers.
|
|
*
|
|
* Return 0 on success.
|
|
* Return -1 if the group is full or the peer failed to unpack.
|
|
* Return -2 if `peer_number` does not designate a valid peer.
|
|
*/
|
|
non_null(1, 2, 4) nullable(6)
|
|
static int handle_gc_sync_response(const GC_Session *c, GC_Chat *chat, uint32_t peer_number, const uint8_t *data,
|
|
uint16_t length, void *userdata)
|
|
{
|
|
if (chat->connection_state == CS_CONNECTED && get_gc_confirmed_numpeers(chat) >= chat->shared_state.maxpeers
|
|
&& !peer_is_founder(chat, peer_number)) {
|
|
return -1;
|
|
}
|
|
|
|
if (length > 0) {
|
|
if (!unpack_gc_sync_announce(chat, data, length)) {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
chat->connection_state = CS_CONNECTED;
|
|
|
|
GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
return -2;
|
|
}
|
|
|
|
if (!send_gc_peer_exchange(chat, gconn)) {
|
|
LOGGER_WARNING(chat->log, "Failed to send peer exchange on sync response");
|
|
}
|
|
|
|
if (c->self_join != nullptr && chat->time_connected == 0) {
|
|
c->self_join(c->messenger, chat->group_number, userdata);
|
|
chat->time_connected = mono_time_get(chat->mono_time);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
non_null() static int get_gc_peer_public_key(const GC_Chat *chat, uint32_t peer_number, uint8_t *public_key);
|
|
non_null() static bool send_peer_shared_state(const GC_Chat *chat, GC_Connection *gconn);
|
|
non_null() static bool send_peer_mod_list(const GC_Chat *chat, GC_Connection *gconn);
|
|
non_null() static bool send_peer_sanctions_list(const GC_Chat *chat, GC_Connection *gconn);
|
|
non_null() static bool send_peer_topic(const GC_Chat *chat, GC_Connection *gconn);
|
|
|
|
|
|
/** @brief Creates a sync announce for peer designated by `gconn` and puts it in `announce`, which
|
|
* must be zeroed by the caller.
|
|
*
|
|
* Returns true if announce was successfully created.
|
|
*/
|
|
non_null()
|
|
static bool create_sync_announce(const GC_Chat *chat, const GC_Connection *gconn, uint32_t peer_number,
|
|
GC_Announce *announce)
|
|
{
|
|
if (chat == nullptr || gconn == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
if (gconn->tcp_relays_count > 0) {
|
|
if (gcc_copy_tcp_relay(chat->rng, &announce->tcp_relays[0], gconn)) {
|
|
announce->tcp_relays_count = 1;
|
|
}
|
|
}
|
|
|
|
get_gc_peer_public_key(chat, peer_number, announce->peer_public_key);
|
|
|
|
if (gcc_ip_port_is_set(gconn)) {
|
|
announce->ip_port = gconn->addr.ip_port;
|
|
announce->ip_port_is_set = true;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
non_null()
|
|
static bool sync_response_send_peers(GC_Chat *chat, GC_Connection *gconn, uint32_t peer_number, bool first_sync)
|
|
{
|
|
// Always respond to a peer's first sync request
|
|
if (!first_sync && !mono_time_is_timeout(chat->mono_time,
|
|
chat->last_sync_response_peer_list,
|
|
GC_SYNC_RESPONSE_PEER_LIST_LIMIT)) {
|
|
return true;
|
|
}
|
|
|
|
uint8_t *response = (uint8_t *)malloc(MAX_GC_PACKET_CHUNK_SIZE);
|
|
|
|
if (response == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
size_t num_announces = 0;
|
|
|
|
for (uint32_t i = 1; i < chat->numpeers; ++i) {
|
|
const GC_Connection *peer_gconn = get_gc_connection(chat, i);
|
|
|
|
if (peer_gconn == nullptr || !peer_gconn->confirmed) {
|
|
continue;
|
|
}
|
|
|
|
if (peer_gconn->public_key_hash == gconn->public_key_hash || i == peer_number) {
|
|
continue;
|
|
}
|
|
|
|
GC_Announce announce = {0};
|
|
|
|
if (!create_sync_announce(chat, peer_gconn, i, &announce)) {
|
|
continue;
|
|
}
|
|
|
|
const int packed_length = gca_pack_announce(chat->log, response, MAX_GC_PACKET_CHUNK_SIZE, &announce);
|
|
|
|
if (packed_length <= 0) {
|
|
LOGGER_WARNING(chat->log, "Failed to pack announce: %d", packed_length);
|
|
continue;
|
|
}
|
|
|
|
if (!send_gc_sync_response(chat, gconn, response, packed_length)) {
|
|
LOGGER_WARNING(chat->log, "Failed to send peer announce info");
|
|
continue;
|
|
}
|
|
|
|
++num_announces;
|
|
}
|
|
|
|
free(response);
|
|
|
|
if (num_announces == 0) {
|
|
// we send an empty sync response even if we didn't send any peers as an acknowledgement
|
|
if (!send_gc_sync_response(chat, gconn, nullptr, 0)) {
|
|
LOGGER_WARNING(chat->log, "Failed to send peer announce info");
|
|
return false;
|
|
}
|
|
} else {
|
|
chat->last_sync_response_peer_list = mono_time_get(chat->mono_time);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Sends group state specified by `sync_flags` peer designated by `peer_number`.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null()
|
|
static bool sync_response_send_state(GC_Chat *chat, GC_Connection *gconn, uint32_t peer_number,
|
|
uint16_t sync_flags)
|
|
{
|
|
const bool first_sync = gconn->last_sync_response == 0;
|
|
|
|
// Do not change the order of these four send calls. See: https://toktok.ltd/spec.html#sync_request-0xf8
|
|
if ((sync_flags & GF_STATE) > 0 && chat->shared_state.version > 0) {
|
|
if (!send_peer_shared_state(chat, gconn)) {
|
|
LOGGER_WARNING(chat->log, "Failed to send shared state");
|
|
return false;
|
|
}
|
|
|
|
if (!send_peer_mod_list(chat, gconn)) {
|
|
LOGGER_WARNING(chat->log, "Failed to send mod list");
|
|
return false;
|
|
}
|
|
|
|
if (!send_peer_sanctions_list(chat, gconn)) {
|
|
LOGGER_WARNING(chat->log, "Failed to send sanctions list");
|
|
return false;
|
|
}
|
|
|
|
gconn->last_sync_response = mono_time_get(chat->mono_time);
|
|
}
|
|
|
|
if ((sync_flags & GF_TOPIC) > 0 && chat->time_connected > 0 && chat->topic_info.version > 0) {
|
|
if (!send_peer_topic(chat, gconn)) {
|
|
LOGGER_WARNING(chat->log, "Failed to send topic");
|
|
return false;
|
|
}
|
|
|
|
gconn->last_sync_response = mono_time_get(chat->mono_time);
|
|
}
|
|
|
|
if ((sync_flags & GF_PEERS) > 0) {
|
|
if (!sync_response_send_peers(chat, gconn, peer_number, first_sync)) {
|
|
return false;
|
|
}
|
|
|
|
gconn->last_sync_response = mono_time_get(chat->mono_time);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Handles a sync request packet and sends a response containing the peer list.
|
|
*
|
|
* May send additional group info in separate packets, including the topic, shared state, mod list,
|
|
* and sanctions list, if respective sync flags are set.
|
|
*
|
|
* If the group is password protected the password in the request data must first be verified.
|
|
*
|
|
* Return 0 if packet is handled correctly.
|
|
* Return -1 if packet has invalid size.
|
|
* Return -2 if password is invalid.
|
|
* Return -3 if we fail to send a response packet.
|
|
* Return -4 if `peer_number` does not designate a valid peer.
|
|
*/
|
|
non_null()
|
|
static int handle_gc_sync_request(GC_Chat *chat, uint32_t peer_number, const uint8_t *data, uint16_t length)
|
|
{
|
|
GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
return -4;
|
|
}
|
|
|
|
if (length < sizeof(uint16_t)) {
|
|
return -1;
|
|
}
|
|
|
|
if (chat->numpeers <= 1) {
|
|
return 0;
|
|
}
|
|
|
|
if (chat->shared_state.version == 0) {
|
|
LOGGER_DEBUG(chat->log, "Got sync request with uninitialized state");
|
|
return 0;
|
|
}
|
|
|
|
if (!mono_time_is_timeout(chat->mono_time, gconn->last_sync_response, GC_PING_TIMEOUT)) {
|
|
LOGGER_DEBUG(chat->log, "sync request rate limit for peer %d", peer_number);
|
|
return 0;
|
|
}
|
|
|
|
uint16_t sync_flags;
|
|
net_unpack_u16(data, &sync_flags);
|
|
|
|
if (chat_is_password_protected(chat)) {
|
|
if (length < (sizeof(uint16_t) * 2) + MAX_GC_PASSWORD_SIZE) {
|
|
return -2;
|
|
}
|
|
|
|
uint16_t password_length;
|
|
net_unpack_u16(data + sizeof(uint16_t), &password_length);
|
|
|
|
const uint8_t *password = data + (sizeof(uint16_t) * 2);
|
|
|
|
if (!validate_password(chat, password, password_length)) {
|
|
LOGGER_DEBUG(chat->log, "Invalid password");
|
|
return -2;
|
|
}
|
|
}
|
|
|
|
if (!sync_response_send_state(chat, gconn, peer_number, sync_flags)) {
|
|
return -3;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
non_null() static void copy_self(const GC_Chat *chat, GC_Peer *peer);
|
|
non_null() static bool send_gc_peer_info_request(const GC_Chat *chat, GC_Connection *gconn);
|
|
|
|
|
|
/** @brief Shares our TCP relays with peer and adds shared relays to our connection with them.
|
|
*
|
|
* Returns true on success or if we're not connected to any TCP relays.
|
|
*/
|
|
non_null()
|
|
static bool send_gc_tcp_relays(const GC_Chat *chat, GC_Connection *gconn)
|
|
{
|
|
|
|
Node_format tcp_relays[GCC_MAX_TCP_SHARED_RELAYS];
|
|
uint8_t data[GCC_MAX_TCP_SHARED_RELAYS * PACKED_NODE_SIZE_IP6];
|
|
|
|
const uint32_t n = tcp_copy_connected_relays_index(chat->tcp_conn, tcp_relays, GCC_MAX_TCP_SHARED_RELAYS,
|
|
gconn->tcp_relay_share_index);
|
|
|
|
if (n == 0) {
|
|
return true;
|
|
}
|
|
|
|
gconn->tcp_relay_share_index += GCC_MAX_TCP_SHARED_RELAYS;
|
|
|
|
for (uint32_t i = 0; i < n; ++i) {
|
|
add_tcp_relay_connection(chat->tcp_conn, gconn->tcp_connection_num, &tcp_relays[i].ip_port,
|
|
tcp_relays[i].public_key);
|
|
}
|
|
|
|
const int nodes_len = pack_nodes(chat->log, data, sizeof(data), tcp_relays, n);
|
|
|
|
if (nodes_len <= 0 || (uint32_t)nodes_len > sizeof(data)) {
|
|
LOGGER_ERROR(chat->log, "Failed to pack tcp relays (nodes_len: %d)", nodes_len);
|
|
return false;
|
|
}
|
|
|
|
if (!send_lossless_group_packet(chat, gconn, data, (uint16_t)nodes_len, GP_TCP_RELAYS)) {
|
|
LOGGER_ERROR(chat->log, "Failed to send tcp relays");
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Adds a peer's shared TCP relays to our connection with them.
|
|
*
|
|
* Return 0 if packet is handled correctly.
|
|
* Return -1 if packet has invalid size.
|
|
* Return -2 if packet contains invalid data.
|
|
*/
|
|
non_null()
|
|
static int handle_gc_tcp_relays(GC_Chat *chat, GC_Connection *gconn, const uint8_t *data, uint16_t length)
|
|
{
|
|
if (length == 0) {
|
|
return -1;
|
|
}
|
|
|
|
Node_format tcp_relays[GCC_MAX_TCP_SHARED_RELAYS];
|
|
const int num_nodes = unpack_nodes(tcp_relays, GCC_MAX_TCP_SHARED_RELAYS, nullptr, data, length, true);
|
|
|
|
if (num_nodes <= 0) {
|
|
return -2;
|
|
}
|
|
|
|
for (int i = 0; i < num_nodes; ++i) {
|
|
const Node_format *tcp_node = &tcp_relays[i];
|
|
|
|
if (add_tcp_relay_connection(chat->tcp_conn, gconn->tcp_connection_num, &tcp_node->ip_port,
|
|
tcp_node->public_key) == 0) {
|
|
gcc_save_tcp_relay(chat->rng, gconn, tcp_node);
|
|
|
|
if (gconn->tcp_relays_count == 1) {
|
|
add_gc_saved_peers(chat, gconn); // make sure we save at least one tcp relay
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Send invite request to peer_number.
|
|
*
|
|
* If the group requires a password, the packet will
|
|
* contain the password supplied by the invite requestor.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null()
|
|
static bool send_gc_invite_request(const GC_Chat *chat, GC_Connection *gconn)
|
|
{
|
|
uint16_t length = 0;
|
|
uint8_t data[sizeof(uint16_t) + MAX_GC_PASSWORD_SIZE];
|
|
|
|
if (chat_is_password_protected(chat)) {
|
|
net_pack_u16(data, chat->shared_state.password_length);
|
|
length += sizeof(uint16_t);
|
|
|
|
memcpy(data + length, chat->shared_state.password, MAX_GC_PASSWORD_SIZE);
|
|
length += MAX_GC_PASSWORD_SIZE;
|
|
}
|
|
|
|
return send_lossless_group_packet(chat, gconn, data, length, GP_INVITE_REQUEST);
|
|
}
|
|
|
|
non_null()
|
|
static bool send_gc_invite_response(const GC_Chat *chat, GC_Connection *gconn)
|
|
{
|
|
return send_lossless_group_packet(chat, gconn, nullptr, 0, GP_INVITE_RESPONSE);
|
|
}
|
|
|
|
/** @brief Handles an invite response packet.
|
|
*
|
|
* Return 0 if packet is correctly handled.
|
|
* Return -1 if we fail to send a sync request.
|
|
*/
|
|
non_null()
|
|
static int handle_gc_invite_response(GC_Chat *chat, GC_Connection *gconn)
|
|
{
|
|
const uint16_t flags = GF_PEERS | GF_TOPIC | GF_STATE;
|
|
|
|
if (!send_gc_sync_request(chat, gconn, flags)) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @brief Handles an invite response reject packet.
|
|
*
|
|
* Return 0 if packet is handled correctly.
|
|
* Return -1 if packet has invalid size.
|
|
*/
|
|
non_null(1, 2, 3) nullable(5)
|
|
static int handle_gc_invite_response_reject(const GC_Session *c, GC_Chat *chat, const uint8_t *data, uint16_t length,
|
|
void *userdata)
|
|
{
|
|
if (length < sizeof(uint8_t)) {
|
|
return -1;
|
|
}
|
|
|
|
if (chat->connection_state == CS_CONNECTED) {
|
|
return 0;
|
|
}
|
|
|
|
if (gc_get_self_role(chat) == GR_FOUNDER) {
|
|
return 0;
|
|
}
|
|
|
|
uint8_t type = data[0];
|
|
|
|
if (type >= GJ_INVALID) {
|
|
type = GJ_INVITE_FAILED;
|
|
}
|
|
|
|
chat->connection_state = CS_DISCONNECTED;
|
|
|
|
if (c->rejected != nullptr) {
|
|
c->rejected(c->messenger, chat->group_number, type, userdata);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Sends an invite response rejection packet to peer designated by `gconn`.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null()
|
|
static bool send_gc_invite_response_reject(const GC_Chat *chat, const GC_Connection *gconn, uint8_t type)
|
|
{
|
|
if (type >= GJ_INVALID) {
|
|
type = GJ_INVITE_FAILED;
|
|
}
|
|
|
|
uint8_t data[1];
|
|
data[0] = type;
|
|
const uint16_t length = 1;
|
|
|
|
return send_lossy_group_packet(chat, gconn, data, length, GP_INVITE_RESPONSE_REJECT);
|
|
}
|
|
|
|
/** @brief Handles an invite request and verifies that the correct password has been supplied
|
|
* if the group is password protected.
|
|
*
|
|
* Return 0 if invite request is successfully handled.
|
|
* Return -1 if the group is full.
|
|
* Return -2 if the supplied password is invalid.
|
|
* Return -3 if we fail to send an invite response.
|
|
* Return -4 if peer_number does not designate a valid peer.
|
|
*/
|
|
non_null()
|
|
static int handle_gc_invite_request(GC_Chat *chat, uint32_t peer_number, const uint8_t *data, uint16_t length)
|
|
{
|
|
if (chat->shared_state.version == 0) { // we aren't synced yet; ignore request
|
|
return 0;
|
|
}
|
|
|
|
GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
return -4;
|
|
}
|
|
|
|
int ret = -1;
|
|
|
|
uint8_t invite_error;
|
|
|
|
if (get_gc_confirmed_numpeers(chat) >= chat->shared_state.maxpeers && !peer_is_founder(chat, peer_number)) {
|
|
invite_error = GJ_GROUP_FULL;
|
|
goto FAILED_INVITE;
|
|
}
|
|
|
|
if (chat_is_password_protected(chat)) {
|
|
invite_error = GJ_INVALID_PASSWORD;
|
|
ret = -2;
|
|
|
|
if (length < sizeof(uint16_t) + MAX_GC_PASSWORD_SIZE) {
|
|
goto FAILED_INVITE;
|
|
}
|
|
|
|
uint16_t password_length;
|
|
net_unpack_u16(data, &password_length);
|
|
|
|
const uint8_t *password = data + sizeof(uint16_t);
|
|
|
|
if (!validate_password(chat, password, password_length)) {
|
|
goto FAILED_INVITE;
|
|
}
|
|
}
|
|
|
|
if (!send_gc_invite_response(chat, gconn)) {
|
|
return -3;
|
|
}
|
|
|
|
return 0;
|
|
|
|
FAILED_INVITE:
|
|
send_gc_invite_response_reject(chat, gconn, invite_error);
|
|
gcc_mark_for_deletion(gconn, chat->tcp_conn, GC_EXIT_TYPE_DISCONNECTED, nullptr, 0);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/** @brief Sends a lossless packet of type and length to all confirmed peers. */
|
|
non_null()
|
|
static void send_gc_lossless_packet_all_peers(const GC_Chat *chat, const uint8_t *data, uint16_t length, uint8_t type)
|
|
{
|
|
for (uint32_t i = 1; i < chat->numpeers; ++i) {
|
|
GC_Connection *gconn = get_gc_connection(chat, i);
|
|
|
|
assert(gconn != nullptr);
|
|
|
|
if (gconn->confirmed) {
|
|
send_lossless_group_packet(chat, gconn, data, length, type);
|
|
}
|
|
}
|
|
}
|
|
|
|
/** @brief Sends a lossy packet of type and length to all confirmed peers. */
|
|
non_null()
|
|
static void send_gc_lossy_packet_all_peers(const GC_Chat *chat, const uint8_t *data, uint16_t length, uint8_t type)
|
|
{
|
|
for (uint32_t i = 1; i < chat->numpeers; ++i) {
|
|
const GC_Connection *gconn = get_gc_connection(chat, i);
|
|
|
|
assert(gconn != nullptr);
|
|
|
|
if (gconn->confirmed) {
|
|
send_lossy_group_packet(chat, gconn, data, length, type);
|
|
}
|
|
}
|
|
}
|
|
|
|
/** @brief Creates packet with broadcast header info followed by data of length.
|
|
*
|
|
* Returns length of packet including header.
|
|
*/
|
|
non_null(3) nullable(1)
|
|
static uint16_t make_gc_broadcast_header(const uint8_t *data, uint16_t length, uint8_t *packet, uint8_t bc_type)
|
|
{
|
|
packet[0] = bc_type;
|
|
const uint16_t header_len = sizeof(uint8_t);
|
|
|
|
if (data != nullptr && length > 0) {
|
|
memcpy(packet + header_len, data, length);
|
|
}
|
|
|
|
return length + header_len;
|
|
}
|
|
|
|
/** @brief sends a group broadcast packet to all confirmed peers.
|
|
*
|
|
* Returns true on success.
|
|
*/
|
|
non_null(1) nullable(2)
|
|
static bool send_gc_broadcast_message(const GC_Chat *chat, const uint8_t *data, uint16_t length, uint8_t bc_type)
|
|
{
|
|
if (length + GC_BROADCAST_ENC_HEADER_SIZE > MAX_GC_PACKET_SIZE) {
|
|
LOGGER_ERROR(chat->log, "Failed to broadcast message: invalid length %u", length);
|
|
return false;
|
|
}
|
|
|
|
uint8_t *packet = (uint8_t *)malloc(length + GC_BROADCAST_ENC_HEADER_SIZE);
|
|
|
|
if (packet == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
const uint16_t packet_len = make_gc_broadcast_header(data, length, packet, bc_type);
|
|
|
|
send_gc_lossless_packet_all_peers(chat, packet, packet_len, GP_BROADCAST);
|
|
|
|
free(packet);
|
|
|
|
return true;
|
|
}
|
|
|
|
non_null()
|
|
static bool group_topic_lock_enabled(const GC_Chat *chat);
|
|
|
|
/** @brief Compares the supplied values with our own state and returns the appropriate
|
|
* sync flags for a sync request.
|
|
*/
|
|
non_null()
|
|
static uint16_t get_sync_flags(const GC_Chat *chat, uint16_t peers_checksum, uint16_t peer_count,
|
|
uint32_t sstate_version, uint32_t screds_version, uint16_t roles_checksum,
|
|
uint32_t topic_version, uint16_t topic_checksum)
|
|
{
|
|
uint16_t sync_flags = 0;
|
|
|
|
if (peers_checksum != chat->peers_checksum && peer_count >= get_gc_confirmed_numpeers(chat)) {
|
|
sync_flags |= GF_PEERS;
|
|
}
|
|
|
|
if (sstate_version > 0) {
|
|
const uint16_t self_roles_checksum = chat->moderation.sanctions_creds.checksum + chat->roles_checksum;
|
|
|
|
if ((sstate_version > chat->shared_state.version || screds_version > chat->moderation.sanctions_creds.version)
|
|
|| (screds_version == chat->moderation.sanctions_creds.version
|
|
&& roles_checksum != self_roles_checksum)) {
|
|
sync_flags |= GF_STATE;
|
|
}
|
|
}
|
|
|
|
if (group_topic_lock_enabled(chat)) {
|
|
if (topic_version > chat->topic_info.version ||
|
|
(topic_version == chat->topic_info.version && topic_checksum > chat->topic_info.checksum)) {
|
|
sync_flags |= GF_TOPIC;
|
|
}
|
|
} else if (topic_checksum > chat->topic_info.checksum) {
|
|
sync_flags |= GF_TOPIC;
|
|
}
|
|
|
|
return sync_flags;
|
|
}
|
|
|
|
/** @brief Compares a peer's group sync info that we received in a ping packet to our own.
|
|
*
|
|
* If their info appears to be more recent than ours we send them a sync request.
|
|
*
|
|
* This function should only be called from `handle_gc_ping()`.
|
|
*
|
|
* Returns true if a sync request packet is successfully sent.
|
|
*/
|
|
non_null()
|
|
static bool do_gc_peer_state_sync(GC_Chat *chat, GC_Connection *gconn, const uint8_t *sync_data,
|
|
const uint16_t length)
|
|
{
|
|
if (length < GC_PING_PACKET_MIN_DATA_SIZE) {
|
|
return false;
|
|
}
|
|
|
|
uint16_t peers_checksum;
|
|
uint16_t peer_count;
|
|
uint32_t sstate_version;
|
|
uint32_t screds_version;
|
|
uint16_t roles_checksum;
|
|
uint32_t topic_version;
|
|
uint16_t topic_checksum;
|
|
|
|
size_t unpacked_len = 0;
|
|
|
|
net_unpack_u16(sync_data, &peers_checksum);
|
|
unpacked_len += sizeof(uint16_t);
|
|
|
|
net_unpack_u16(sync_data + unpacked_len, &peer_count);
|
|
unpacked_len += sizeof(uint16_t);
|
|
|
|
net_unpack_u32(sync_data + unpacked_len, &sstate_version);
|
|
unpacked_len += sizeof(uint32_t);
|
|
|
|
net_unpack_u32(sync_data + unpacked_len, &screds_version);
|
|
unpacked_len += sizeof(uint32_t);
|
|
|
|
net_unpack_u16(sync_data + unpacked_len, &roles_checksum);
|
|
unpacked_len += sizeof(uint16_t);
|
|
|
|
net_unpack_u32(sync_data + unpacked_len, &topic_version);
|
|
unpacked_len += sizeof(uint32_t);
|
|
|
|
net_unpack_u16(sync_data + unpacked_len, &topic_checksum);
|
|
unpacked_len += sizeof(uint16_t);
|
|
|
|
if (unpacked_len != GC_PING_PACKET_MIN_DATA_SIZE) {
|
|
LOGGER_FATAL(chat->log, "Unpacked length is impossible (%zu)", unpacked_len);
|
|
return false;
|
|
}
|
|
|
|
const uint16_t sync_flags = get_sync_flags(chat, peers_checksum, peer_count, sstate_version, screds_version,
|
|
roles_checksum, topic_version, topic_checksum);
|
|
|
|
if (sync_flags > 0) {
|
|
return send_gc_sync_request(chat, gconn, sync_flags);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/** @brief Handles a ping packet.
|
|
*
|
|
* The packet contains sync information including peer's peer list checksum,
|
|
* shared state version, topic version, and sanction credentials version.
|
|
*
|
|
* Return 0 if packet is handled correctly.
|
|
* Return -1 if packet has invalid size or peer is not confirmed.
|
|
*/
|
|
non_null()
|
|
static int handle_gc_ping(GC_Chat *chat, GC_Connection *gconn, const uint8_t *data, uint16_t length)
|
|
{
|
|
if (length < GC_PING_PACKET_MIN_DATA_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
if (!gconn->confirmed) {
|
|
return -1;
|
|
}
|
|
|
|
do_gc_peer_state_sync(chat, gconn, data, length);
|
|
|
|
if (length > GC_PING_PACKET_MIN_DATA_SIZE) {
|
|
IP_Port ip_port;
|
|
memset(&ip_port, 0, sizeof(IP_Port));
|
|
|
|
if (unpack_ip_port(&ip_port, data + GC_PING_PACKET_MIN_DATA_SIZE,
|
|
length - GC_PING_PACKET_MIN_DATA_SIZE, false) > 0) {
|
|
gcc_set_ip_port(gconn, &ip_port);
|
|
add_gc_saved_peers(chat, gconn);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gc_set_self_status(const Messenger *m, int group_number, Group_Peer_Status status)
|
|
{
|
|
const GC_Session *c = m->group_handler;
|
|
const GC_Chat *chat = gc_get_group(c, group_number);
|
|
|
|
if (chat == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
self_gc_set_status(chat, status);
|
|
|
|
uint8_t data[1];
|
|
data[0] = gc_get_self_status(chat);
|
|
|
|
if (!send_gc_broadcast_message(chat, data, 1, GM_STATUS)) {
|
|
return -2;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Handles a status broadcast from `peer`.
|
|
*
|
|
* Return 0 if packet is handled correctly.
|
|
* Return -1 if packet has invalid length.
|
|
*/
|
|
non_null(1, 2, 3, 4) nullable(6)
|
|
static int handle_gc_status(const GC_Session *c, const GC_Chat *chat, GC_Peer *peer, const uint8_t *data,
|
|
uint16_t length, void *userdata)
|
|
{
|
|
if (length < sizeof(uint8_t)) {
|
|
return -1;
|
|
}
|
|
|
|
const Group_Peer_Status status = (Group_Peer_Status)data[0];
|
|
|
|
if (status > GS_BUSY) {
|
|
LOGGER_WARNING(chat->log, "Received invalid status %u", status);
|
|
return 0;
|
|
}
|
|
|
|
peer->status = status;
|
|
|
|
if (c->status_change != nullptr) {
|
|
c->status_change(c->messenger, chat->group_number, peer->peer_id, status, userdata);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
uint8_t gc_get_status(const GC_Chat *chat, uint32_t peer_id)
|
|
{
|
|
const int peer_number = get_peer_number_of_peer_id(chat, peer_id);
|
|
|
|
const GC_Peer *peer = get_gc_peer(chat, peer_number);
|
|
|
|
if (peer == nullptr) {
|
|
return UINT8_MAX;
|
|
}
|
|
|
|
return peer->status;
|
|
}
|
|
|
|
uint8_t gc_get_role(const GC_Chat *chat, uint32_t peer_id)
|
|
{
|
|
const int peer_number = get_peer_number_of_peer_id(chat, peer_id);
|
|
|
|
const GC_Peer *peer = get_gc_peer(chat, peer_number);
|
|
|
|
if (peer == nullptr) {
|
|
return UINT8_MAX;
|
|
}
|
|
|
|
return peer->role;
|
|
}
|
|
|
|
void gc_get_chat_id(const GC_Chat *chat, uint8_t *dest)
|
|
{
|
|
if (dest != nullptr) {
|
|
memcpy(dest, get_chat_id(chat->chat_public_key), CHAT_ID_SIZE);
|
|
}
|
|
}
|
|
|
|
/** @brief Sends self peer info to `gconn`.
|
|
*
|
|
* If the group is password protected the request will contain the group
|
|
* password, which the recipient will validate in the respective
|
|
* group message handler.
|
|
*
|
|
* Returns true on success.
|
|
*/
|
|
non_null()
|
|
static bool send_self_to_peer(const GC_Chat *chat, GC_Connection *gconn)
|
|
{
|
|
GC_Peer *self = (GC_Peer *)calloc(1, sizeof(GC_Peer));
|
|
|
|
if (self == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
copy_self(chat, self);
|
|
|
|
const uint16_t data_size = PACKED_GC_PEER_SIZE + sizeof(uint16_t) + MAX_GC_PASSWORD_SIZE;
|
|
uint8_t *data = (uint8_t *)malloc(data_size);
|
|
|
|
if (data == nullptr) {
|
|
free(self);
|
|
return false;
|
|
}
|
|
|
|
uint16_t length = 0;
|
|
|
|
if (chat_is_password_protected(chat)) {
|
|
net_pack_u16(data, chat->shared_state.password_length);
|
|
length += sizeof(uint16_t);
|
|
|
|
memcpy(data + sizeof(uint16_t), chat->shared_state.password, MAX_GC_PASSWORD_SIZE);
|
|
length += MAX_GC_PASSWORD_SIZE;
|
|
}
|
|
|
|
const int packed_len = pack_gc_peer(data + length, data_size - length, self);
|
|
length += packed_len;
|
|
|
|
free(self);
|
|
|
|
if (packed_len <= 0) {
|
|
LOGGER_DEBUG(chat->log, "pack_gc_peer failed in handle_gc_peer_info_request_request %d", packed_len);
|
|
free(data);
|
|
return false;
|
|
}
|
|
|
|
const bool ret = send_lossless_group_packet(chat, gconn, data, length, GP_PEER_INFO_RESPONSE);
|
|
|
|
free(data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/** @brief Handles a peer info request packet.
|
|
*
|
|
* Return 0 on success.
|
|
* Return -1 if unconfirmed peer is trying to join a full group.
|
|
* Return -2 if response fails.
|
|
* Return -3 if `peer_number` does not designate a valid peer.
|
|
*/
|
|
non_null()
|
|
static int handle_gc_peer_info_request(const GC_Chat *chat, uint32_t peer_number)
|
|
{
|
|
GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
return -3;
|
|
}
|
|
|
|
if (!gconn->confirmed && get_gc_confirmed_numpeers(chat) >= chat->shared_state.maxpeers
|
|
&& !peer_is_founder(chat, peer_number)) {
|
|
return -1;
|
|
}
|
|
|
|
if (!send_self_to_peer(chat, gconn)) {
|
|
return -2;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Sends a peer info request to peer designated by `gconn`.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null()
|
|
static bool send_gc_peer_info_request(const GC_Chat *chat, GC_Connection *gconn)
|
|
{
|
|
return send_lossless_group_packet(chat, gconn, nullptr, 0, GP_PEER_INFO_REQUEST);
|
|
}
|
|
|
|
/** @brief Do peer info exchange with peer designated by `gconn`.
|
|
*
|
|
* This function sends two packets to a peer. The first packet is a peer info response containing our own info,
|
|
* and the second packet is a peer info request.
|
|
*
|
|
* Return false if either packet fails to send.
|
|
*/
|
|
static bool send_gc_peer_exchange(const GC_Chat *chat, GC_Connection *gconn)
|
|
{
|
|
return send_self_to_peer(chat, gconn) && send_gc_peer_info_request(chat, gconn);
|
|
}
|
|
|
|
/** @brief Updates peer's info, validates their group role, and sets them as a confirmed peer.
|
|
* If the group is password protected the password must first be validated.
|
|
*
|
|
* Return 0 if packet is handled correctly.
|
|
* Return -1 if packet has invalid size.
|
|
* Return -2 if group number is invalid.
|
|
* Return -3 if peer number is invalid.
|
|
* Return -4 if unconfirmed peer is trying to join a full group.
|
|
* Return -5 if supplied group password is invalid.
|
|
* Return -6 if we fail to add the peer to the peer list.
|
|
* Return -7 if peer's role cannot be validated.
|
|
* Return -8 if malloc fails.
|
|
*/
|
|
non_null(1, 2, 4) nullable(6)
|
|
static int handle_gc_peer_info_response(const GC_Session *c, GC_Chat *chat, uint32_t peer_number,
|
|
const uint8_t *data, uint16_t length, void *userdata)
|
|
{
|
|
if (length < PACKED_GC_PEER_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
GC_Peer *peer = get_gc_peer(chat, peer_number);
|
|
|
|
if (peer == nullptr) {
|
|
return -3;
|
|
}
|
|
|
|
GC_Connection *gconn = &peer->gconn;
|
|
|
|
if (!gconn->confirmed && get_gc_confirmed_numpeers(chat) >= chat->shared_state.maxpeers
|
|
&& !peer_is_founder(chat, peer_number)) {
|
|
return -4;
|
|
}
|
|
|
|
uint16_t unpacked_len = 0;
|
|
|
|
if (chat_is_password_protected(chat)) {
|
|
if (length < sizeof(uint16_t) + MAX_GC_PASSWORD_SIZE) {
|
|
return -5;
|
|
}
|
|
|
|
uint16_t password_length;
|
|
net_unpack_u16(data, &password_length);
|
|
unpacked_len += sizeof(uint16_t);
|
|
|
|
if (!validate_password(chat, data + unpacked_len, password_length)) {
|
|
return -5;
|
|
}
|
|
|
|
unpacked_len += MAX_GC_PASSWORD_SIZE;
|
|
}
|
|
|
|
if (length <= unpacked_len) {
|
|
return -1;
|
|
}
|
|
|
|
GC_Peer *peer_info = (GC_Peer *)calloc(1, sizeof(GC_Peer));
|
|
|
|
if (peer_info == nullptr) {
|
|
return -8;
|
|
}
|
|
|
|
if (unpack_gc_peer(peer_info, data + unpacked_len, length - unpacked_len) == -1) {
|
|
LOGGER_ERROR(chat->log, "unpack_gc_peer() failed");
|
|
free(peer_info);
|
|
return -6;
|
|
}
|
|
|
|
if (peer_update(chat, peer_info, peer_number) == -1) {
|
|
LOGGER_WARNING(chat->log, "peer_update() failed");
|
|
free(peer_info);
|
|
return -6;
|
|
}
|
|
|
|
free(peer_info);
|
|
|
|
const bool was_confirmed = gconn->confirmed;
|
|
gconn->confirmed = true;
|
|
|
|
update_gc_peer_roles(chat);
|
|
|
|
add_gc_saved_peers(chat, gconn);
|
|
|
|
set_gc_peerlist_checksum(chat);
|
|
|
|
if (c->peer_join != nullptr && !was_confirmed) {
|
|
c->peer_join(c->messenger, chat->group_number, peer->peer_id, userdata);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Sends the group shared state and its signature to peer_number.
|
|
*
|
|
* Returns true on success.
|
|
*/
|
|
non_null()
|
|
static bool send_peer_shared_state(const GC_Chat *chat, GC_Connection *gconn)
|
|
{
|
|
if (chat->shared_state.version == 0) {
|
|
return false;
|
|
}
|
|
|
|
uint8_t packet[GC_SHARED_STATE_ENC_PACKET_SIZE];
|
|
const int length = make_gc_shared_state_packet(chat, packet, sizeof(packet));
|
|
|
|
if (length != GC_SHARED_STATE_ENC_PACKET_SIZE) {
|
|
return false;
|
|
}
|
|
|
|
return send_lossless_group_packet(chat, gconn, packet, (uint16_t)length, GP_SHARED_STATE);
|
|
}
|
|
|
|
/** @brief Sends the group shared state and signature to all confirmed peers.
|
|
*
|
|
* Returns true on success.
|
|
*/
|
|
non_null()
|
|
static bool broadcast_gc_shared_state(const GC_Chat *chat)
|
|
{
|
|
uint8_t packet[GC_SHARED_STATE_ENC_PACKET_SIZE];
|
|
const int packet_len = make_gc_shared_state_packet(chat, packet, sizeof(packet));
|
|
|
|
if (packet_len != GC_SHARED_STATE_ENC_PACKET_SIZE) {
|
|
return false;
|
|
}
|
|
|
|
send_gc_lossless_packet_all_peers(chat, packet, (uint16_t)packet_len, GP_SHARED_STATE);
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Helper function for `do_gc_shared_state_changes()`.
|
|
*
|
|
* If the privacy state has been set to private, we kill our group's connection to the DHT.
|
|
* Otherwise, we create a new connection with the DHT and flag an announcement.
|
|
*/
|
|
non_null(1, 2) nullable(3)
|
|
static void do_privacy_state_change(const GC_Session *c, GC_Chat *chat, void *userdata)
|
|
{
|
|
if (is_public_chat(chat)) {
|
|
if (!m_create_group_connection(c->messenger, chat)) {
|
|
LOGGER_ERROR(chat->log, "Failed to initialize group friend connection");
|
|
} else {
|
|
chat->update_self_announces = true;
|
|
chat->join_type = HJ_PUBLIC;
|
|
}
|
|
} else {
|
|
kill_group_friend_connection(c, chat);
|
|
cleanup_gca(c->announces_list, get_chat_id(chat->chat_public_key));
|
|
chat->join_type = HJ_PRIVATE;
|
|
}
|
|
|
|
if (c->privacy_state != nullptr) {
|
|
c->privacy_state(c->messenger, chat->group_number, chat->shared_state.privacy_state, userdata);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Compares old_shared_state with the chat instance's current shared state and triggers the
|
|
* appropriate callbacks depending on what pieces of state information changed. Also
|
|
* handles DHT announcement/removal if the privacy state changed.
|
|
*
|
|
* The initial retrieval of the shared state on group join will be ignored by this function.
|
|
*/
|
|
non_null(1, 2, 3) nullable(4)
|
|
static void do_gc_shared_state_changes(const GC_Session *c, GC_Chat *chat, const GC_SharedState *old_shared_state,
|
|
void *userdata)
|
|
{
|
|
/* Max peers changed */
|
|
if (chat->shared_state.maxpeers != old_shared_state->maxpeers && c->peer_limit != nullptr) {
|
|
c->peer_limit(c->messenger, chat->group_number, chat->shared_state.maxpeers, userdata);
|
|
}
|
|
|
|
/* privacy state changed */
|
|
if (chat->shared_state.privacy_state != old_shared_state->privacy_state) {
|
|
do_privacy_state_change(c, chat, userdata);
|
|
}
|
|
|
|
/* password changed */
|
|
if (chat->shared_state.password_length != old_shared_state->password_length
|
|
|| memcmp(chat->shared_state.password, old_shared_state->password, old_shared_state->password_length) != 0) {
|
|
|
|
if (c->password != nullptr) {
|
|
c->password(c->messenger, chat->group_number, chat->shared_state.password,
|
|
chat->shared_state.password_length, userdata);
|
|
}
|
|
}
|
|
|
|
/* topic lock state changed */
|
|
if (chat->shared_state.topic_lock != old_shared_state->topic_lock && c->topic_lock != nullptr) {
|
|
const Group_Topic_Lock lock_state = group_topic_lock_enabled(chat) ? TL_ENABLED : TL_DISABLED;
|
|
c->topic_lock(c->messenger, chat->group_number, lock_state, userdata);
|
|
}
|
|
|
|
/* voice state changed */
|
|
if (chat->shared_state.voice_state != old_shared_state->voice_state && c->voice_state != nullptr) {
|
|
c->voice_state(c->messenger, chat->group_number, chat->shared_state.voice_state, userdata);
|
|
}
|
|
}
|
|
|
|
/** @brief Sends a sync request to a random peer in the group with the specificed sync flags.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null()
|
|
static bool send_gc_random_sync_request(GC_Chat *chat, uint16_t sync_flags)
|
|
{
|
|
GC_Connection *rand_gconn = random_gc_connection(chat);
|
|
|
|
if (rand_gconn == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
return send_gc_sync_request(chat, rand_gconn, sync_flags);
|
|
}
|
|
|
|
/** @brief Returns true if all shared state values are legal. */
|
|
non_null()
|
|
static bool validate_gc_shared_state(const GC_SharedState *state)
|
|
{
|
|
return state->maxpeers > 0
|
|
&& state->password_length <= MAX_GC_PASSWORD_SIZE
|
|
&& state->group_name_len > 0
|
|
&& state->group_name_len <= MAX_GC_GROUP_NAME_SIZE
|
|
&& state->privacy_state <= GI_PRIVATE
|
|
&& state->voice_state <= GV_FOUNDER;
|
|
}
|
|
|
|
/** @brief Handles a shared state error and attempts to send a sync request to a random peer.
|
|
*
|
|
* Return 0 if error is currectly handled.
|
|
* Return -1 on failure.
|
|
*/
|
|
non_null()
|
|
static int handle_gc_shared_state_error(GC_Chat *chat, GC_Connection *gconn)
|
|
{
|
|
gcc_mark_for_deletion(gconn, chat->tcp_conn, GC_EXIT_TYPE_SYNC_ERR, nullptr, 0);
|
|
|
|
if (chat->shared_state.version == 0) {
|
|
chat->connection_state = CS_CONNECTING;
|
|
return 0;
|
|
}
|
|
|
|
if (chat->numpeers <= 1) {
|
|
return 0;
|
|
}
|
|
|
|
if (!send_gc_random_sync_request(chat, GF_STATE)) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Handles a shared state packet and validates the new shared state.
|
|
*
|
|
* Return 0 if packet is successfully handled.
|
|
* Return -1 if packet is invalid and this is not successfully handled.
|
|
*/
|
|
non_null(1, 2, 3, 4) nullable(6)
|
|
static int handle_gc_shared_state(const GC_Session *c, GC_Chat *chat, GC_Connection *gconn, const uint8_t *data,
|
|
uint16_t length, void *userdata)
|
|
{
|
|
if (length < GC_SHARED_STATE_ENC_PACKET_SIZE) {
|
|
return handle_gc_shared_state_error(chat, gconn);
|
|
}
|
|
|
|
const uint8_t *signature = data;
|
|
const uint8_t *ss_data = data + SIGNATURE_SIZE;
|
|
const uint16_t ss_length = length - SIGNATURE_SIZE;
|
|
|
|
if (crypto_sign_verify_detached(signature, ss_data, GC_PACKED_SHARED_STATE_SIZE,
|
|
get_sig_pk(chat->chat_public_key)) == -1) {
|
|
LOGGER_DEBUG(chat->log, "Failed to validate shared state signature");
|
|
return handle_gc_shared_state_error(chat, gconn);
|
|
}
|
|
|
|
uint32_t version;
|
|
net_unpack_u32(ss_data, &version); // version is the first 4 bytes of shared state data payload
|
|
|
|
if (version == 0 || version < chat->shared_state.version) {
|
|
LOGGER_DEBUG(chat->log, "Invalid shared state version (got %u, expected >= %u)",
|
|
version, chat->shared_state.version);
|
|
return 0;
|
|
}
|
|
|
|
GC_SharedState old_shared_state = chat->shared_state;
|
|
GC_SharedState new_shared_state;
|
|
|
|
if (unpack_gc_shared_state(&new_shared_state, ss_data, ss_length) == 0) {
|
|
LOGGER_WARNING(chat->log, "Failed to unpack shared state");
|
|
return 0;
|
|
}
|
|
|
|
if (!validate_gc_shared_state(&new_shared_state)) {
|
|
LOGGER_WARNING(chat->log, "Failed to validate shared state");
|
|
return 0;
|
|
}
|
|
|
|
if (chat->shared_state.version == 0) { // init founder public sig key in moderation object
|
|
memcpy(chat->moderation.founder_public_sig_key,
|
|
get_sig_pk(new_shared_state.founder_public_key), SIG_PUBLIC_KEY_SIZE);
|
|
}
|
|
|
|
chat->shared_state = new_shared_state;
|
|
|
|
memcpy(chat->shared_state_sig, signature, sizeof(chat->shared_state_sig));
|
|
|
|
set_gc_shared_state_version(chat, chat->shared_state.version);
|
|
|
|
do_gc_shared_state_changes(c, chat, &old_shared_state, userdata);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Validates `data` containing a moderation list and unpacks it into the
|
|
* shared state of `chat`.
|
|
*
|
|
* Return 1 if data is valid but mod list doesn't match shared state.
|
|
* Return 0 if data is valid.
|
|
* Return -1 if data is invalid.
|
|
*/
|
|
non_null()
|
|
static int validate_unpack_mod_list(GC_Chat *chat, const uint8_t *data, uint16_t length, uint16_t num_mods)
|
|
{
|
|
if (num_mods > MOD_MAX_NUM_MODERATORS) {
|
|
return -1;
|
|
}
|
|
|
|
uint8_t mod_list_hash[MOD_MODERATION_HASH_SIZE] = {0};
|
|
|
|
if (length > 0) {
|
|
mod_list_get_data_hash(mod_list_hash, data, length);
|
|
}
|
|
|
|
// we make sure that this mod list's hash matches the one we got in our last shared state update
|
|
if (chat->shared_state.version > 0
|
|
&& memcmp(mod_list_hash, chat->shared_state.mod_list_hash, MOD_MODERATION_HASH_SIZE) != 0) {
|
|
LOGGER_WARNING(chat->log, "failed to validate mod list hash");
|
|
return 1;
|
|
}
|
|
|
|
if (mod_list_unpack(&chat->moderation, data, length, num_mods) == -1) {
|
|
LOGGER_WARNING(chat->log, "failed to unpack mod list");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Handles new mod_list and compares its hash against the mod_list_hash in the shared state.
|
|
*
|
|
* If the new list fails validation, we attempt to send a sync request to a random peer.
|
|
*
|
|
* Return 0 if packet is handled correctly.
|
|
* Return -1 if packet has invalid size.
|
|
* Return -2 if packet contained invalid data or validation failed.
|
|
*/
|
|
non_null(1, 2, 3) nullable(5)
|
|
static int handle_gc_mod_list(const GC_Session *c, GC_Chat *chat, const uint8_t *data, uint16_t length, void *userdata)
|
|
{
|
|
if (length < sizeof(uint16_t)) {
|
|
return -1;
|
|
}
|
|
|
|
// only the founder can modify the list; the founder can never be out of sync
|
|
if (self_gc_is_founder(chat)) {
|
|
return 0;
|
|
}
|
|
|
|
uint16_t num_mods;
|
|
net_unpack_u16(data, &num_mods);
|
|
|
|
const int unpack_ret = validate_unpack_mod_list(chat, data + sizeof(uint16_t), length - sizeof(uint16_t), num_mods);
|
|
|
|
if (unpack_ret == 0) {
|
|
update_gc_peer_roles(chat);
|
|
|
|
if (chat->connection_state == CS_CONNECTED && c->moderation != nullptr) {
|
|
c->moderation(c->messenger, chat->group_number, (uint32_t) -1, (uint32_t) -1, MV_MOD, userdata);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (unpack_ret == 1) {
|
|
return 0;
|
|
}
|
|
|
|
// unpack/validation failed: handle error
|
|
|
|
if (chat->shared_state.version == 0) {
|
|
chat->connection_state = CS_CONNECTING;
|
|
return -2;
|
|
}
|
|
|
|
if (chat->numpeers <= 1) {
|
|
return 0;
|
|
}
|
|
|
|
send_gc_random_sync_request(chat, GF_STATE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Handles a sanctions list validation error and attempts to send a sync request to a random peer.
|
|
*
|
|
* Return 0 on success.
|
|
* Return -1 on failure.
|
|
*/
|
|
non_null()
|
|
static int handle_gc_sanctions_list_error(GC_Chat *chat)
|
|
{
|
|
if (chat->moderation.sanctions_creds.version > 0) {
|
|
return 0;
|
|
}
|
|
|
|
if (chat->shared_state.version == 0) {
|
|
chat->connection_state = CS_CONNECTING;
|
|
return 0;
|
|
}
|
|
|
|
if (chat->numpeers <= 1) {
|
|
return 0;
|
|
}
|
|
|
|
if (!send_gc_random_sync_request(chat, GF_STATE)) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Handles a sanctions list packet.
|
|
*
|
|
* Return 0 if packet is handled correctly.
|
|
* Return -1 if we failed to gracefully handle a sanctions list error.
|
|
* Return -2 if packet has invalid size.
|
|
*/
|
|
non_null(1, 2, 3) nullable(5)
|
|
static int handle_gc_sanctions_list(const GC_Session *c, GC_Chat *chat, const uint8_t *data, uint16_t length,
|
|
void *userdata)
|
|
{
|
|
if (length < sizeof(uint16_t)) {
|
|
return -2;
|
|
}
|
|
|
|
uint16_t num_sanctions;
|
|
net_unpack_u16(data, &num_sanctions);
|
|
|
|
if (num_sanctions > MOD_MAX_NUM_SANCTIONS) {
|
|
LOGGER_DEBUG(chat->log, "num_sanctions: %u exceeds maximum", num_sanctions);
|
|
return handle_gc_sanctions_list_error(chat);
|
|
}
|
|
|
|
Mod_Sanction_Creds creds;
|
|
|
|
Mod_Sanction *sanctions = (Mod_Sanction *)calloc(num_sanctions, sizeof(Mod_Sanction));
|
|
|
|
if (sanctions == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
const int unpacked_num = sanctions_list_unpack(sanctions, &creds, num_sanctions, data + sizeof(uint16_t),
|
|
length - sizeof(uint16_t), nullptr);
|
|
|
|
if (unpacked_num != num_sanctions) {
|
|
LOGGER_WARNING(chat->log, "Failed to unpack sanctions list: %d", unpacked_num);
|
|
free(sanctions);
|
|
return handle_gc_sanctions_list_error(chat);
|
|
}
|
|
|
|
if (!sanctions_list_check_integrity(&chat->moderation, &creds, sanctions, num_sanctions)) {
|
|
LOGGER_WARNING(chat->log, "Sanctions list failed integrity check");
|
|
free(sanctions);
|
|
return handle_gc_sanctions_list_error(chat);
|
|
}
|
|
|
|
if (creds.version < chat->moderation.sanctions_creds.version) {
|
|
free(sanctions);
|
|
return 0;
|
|
}
|
|
|
|
// this may occur if two mods change the sanctions list at the exact same time
|
|
if (creds.version == chat->moderation.sanctions_creds.version
|
|
&& creds.checksum <= chat->moderation.sanctions_creds.checksum) {
|
|
free(sanctions);
|
|
return 0;
|
|
}
|
|
|
|
sanctions_list_cleanup(&chat->moderation);
|
|
|
|
chat->moderation.sanctions_creds = creds;
|
|
chat->moderation.sanctions = sanctions;
|
|
chat->moderation.num_sanctions = num_sanctions;
|
|
|
|
update_gc_peer_roles(chat);
|
|
|
|
if (chat->connection_state == CS_CONNECTED) {
|
|
if (c->moderation != nullptr) {
|
|
c->moderation(c->messenger, chat->group_number, (uint32_t) -1, (uint32_t) -1, MV_OBSERVER, userdata);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Makes a mod_list packet.
|
|
*
|
|
* Returns length of packet data on success.
|
|
* Returns -1 on failure.
|
|
*/
|
|
non_null()
|
|
static int make_gc_mod_list_packet(const GC_Chat *chat, uint8_t *data, uint32_t maxlen, uint16_t mod_list_size)
|
|
{
|
|
if (maxlen < sizeof(uint16_t) + mod_list_size) {
|
|
return -1;
|
|
}
|
|
|
|
net_pack_u16(data, chat->moderation.num_mods);
|
|
const uint16_t length = sizeof(uint16_t) + mod_list_size;
|
|
|
|
if (mod_list_size > 0) {
|
|
uint8_t *packed_mod_list = (uint8_t *)malloc(mod_list_size);
|
|
|
|
if (packed_mod_list == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
mod_list_pack(&chat->moderation, packed_mod_list);
|
|
memcpy(data + sizeof(uint16_t), packed_mod_list, mod_list_size);
|
|
|
|
free(packed_mod_list);
|
|
}
|
|
|
|
return length;
|
|
}
|
|
|
|
/** @brief Sends the moderator list to peer.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null()
|
|
static bool send_peer_mod_list(const GC_Chat *chat, GC_Connection *gconn)
|
|
{
|
|
const uint16_t mod_list_size = chat->moderation.num_mods * MOD_LIST_ENTRY_SIZE;
|
|
const uint16_t length = sizeof(uint16_t) + mod_list_size;
|
|
uint8_t *packet = (uint8_t *)malloc(length);
|
|
|
|
if (packet == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
const int packet_len = make_gc_mod_list_packet(chat, packet, length, mod_list_size);
|
|
|
|
if (packet_len != length) {
|
|
free(packet);
|
|
return false;
|
|
}
|
|
|
|
const bool ret = send_lossless_group_packet(chat, gconn, packet, length, GP_MOD_LIST);
|
|
|
|
free(packet);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/** @brief Makes a sanctions list packet.
|
|
*
|
|
* Returns packet length on success.
|
|
* Returns -1 on failure.
|
|
*/
|
|
non_null()
|
|
static int make_gc_sanctions_list_packet(const GC_Chat *chat, uint8_t *data, uint16_t maxlen)
|
|
{
|
|
if (maxlen < sizeof(uint16_t)) {
|
|
return -1;
|
|
}
|
|
|
|
net_pack_u16(data, chat->moderation.num_sanctions);
|
|
const uint16_t length = sizeof(uint16_t);
|
|
|
|
const int packed_len = sanctions_list_pack(data + length, maxlen - length, chat->moderation.sanctions,
|
|
chat->moderation.num_sanctions, &chat->moderation.sanctions_creds);
|
|
|
|
if (packed_len < 0) {
|
|
return -1;
|
|
}
|
|
|
|
return (int)(length + packed_len);
|
|
}
|
|
|
|
/** @brief Sends the sanctions list to peer.
|
|
*
|
|
* Returns true on success.
|
|
*/
|
|
non_null()
|
|
static bool send_peer_sanctions_list(const GC_Chat *chat, GC_Connection *gconn)
|
|
{
|
|
if (chat->moderation.sanctions_creds.version == 0) {
|
|
return true;
|
|
}
|
|
|
|
const uint16_t packet_size = MOD_SANCTION_PACKED_SIZE * chat->moderation.num_sanctions +
|
|
sizeof(uint16_t) + MOD_SANCTIONS_CREDS_SIZE;
|
|
|
|
uint8_t *packet = (uint8_t *)malloc(packet_size);
|
|
|
|
if (packet == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
const int packet_len = make_gc_sanctions_list_packet(chat, packet, packet_size);
|
|
|
|
if (packet_len == -1) {
|
|
free(packet);
|
|
return false;
|
|
}
|
|
|
|
const bool ret = send_lossless_group_packet(chat, gconn, packet, (uint16_t)packet_len, GP_SANCTIONS_LIST);
|
|
|
|
free(packet);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/** @brief Sends the sanctions list to all peers in group.
|
|
*
|
|
* Returns true on success.
|
|
*/
|
|
non_null()
|
|
static bool broadcast_gc_sanctions_list(const GC_Chat *chat)
|
|
{
|
|
const uint16_t packet_size = MOD_SANCTION_PACKED_SIZE * chat->moderation.num_sanctions +
|
|
sizeof(uint16_t) + MOD_SANCTIONS_CREDS_SIZE;
|
|
|
|
uint8_t *packet = (uint8_t *)malloc(packet_size);
|
|
|
|
if (packet == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
const int packet_len = make_gc_sanctions_list_packet(chat, packet, packet_size);
|
|
|
|
if (packet_len == -1) {
|
|
free(packet);
|
|
return false;
|
|
}
|
|
|
|
send_gc_lossless_packet_all_peers(chat, packet, (uint16_t)packet_len, GP_SANCTIONS_LIST);
|
|
|
|
free(packet);
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Re-signs all sanctions list entries signed by public_sig_key and broadcasts
|
|
* the updated sanctions list to all group peers.
|
|
*
|
|
* Returns true on success.
|
|
*/
|
|
non_null()
|
|
static bool update_gc_sanctions_list(GC_Chat *chat, const uint8_t *public_sig_key)
|
|
{
|
|
const uint16_t num_replaced = sanctions_list_replace_sig(&chat->moderation, public_sig_key);
|
|
|
|
if (num_replaced == 0) {
|
|
return true;
|
|
}
|
|
|
|
return broadcast_gc_sanctions_list(chat);
|
|
}
|
|
|
|
/** @brief Sends mod_list to all peers in group.
|
|
*
|
|
* Returns true on success.
|
|
*/
|
|
non_null()
|
|
static bool broadcast_gc_mod_list(const GC_Chat *chat)
|
|
{
|
|
const uint16_t mod_list_size = chat->moderation.num_mods * MOD_LIST_ENTRY_SIZE;
|
|
const uint16_t length = sizeof(uint16_t) + mod_list_size;
|
|
uint8_t *packet = (uint8_t *)malloc(length);
|
|
|
|
if (packet == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
const int packet_len = make_gc_mod_list_packet(chat, packet, length, mod_list_size);
|
|
|
|
if (packet_len != length) {
|
|
free(packet);
|
|
return false;
|
|
}
|
|
|
|
send_gc_lossless_packet_all_peers(chat, packet, length, GP_MOD_LIST);
|
|
|
|
free(packet);
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Sends a parting signal to the group.
|
|
*
|
|
* Returns 0 on success.
|
|
* Returns -1 if the message is too long.
|
|
* Returns -2 if the packet failed to send.
|
|
*/
|
|
non_null(1) nullable(2)
|
|
static int send_gc_self_exit(const GC_Chat *chat, const uint8_t *partmessage, uint16_t length)
|
|
{
|
|
if (length > MAX_GC_PART_MESSAGE_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
if (!send_gc_broadcast_message(chat, partmessage, length, GM_PEER_EXIT)) {
|
|
return -2;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Handles a peer exit broadcast. */
|
|
non_null(1, 2) nullable(3)
|
|
static void handle_gc_peer_exit(const GC_Chat *chat, GC_Connection *gconn, const uint8_t *data, uint16_t length)
|
|
{
|
|
if (length > MAX_GC_PART_MESSAGE_SIZE) {
|
|
length = MAX_GC_PART_MESSAGE_SIZE;
|
|
}
|
|
|
|
gcc_mark_for_deletion(gconn, chat->tcp_conn, GC_EXIT_TYPE_QUIT, data, length);
|
|
}
|
|
|
|
int gc_set_self_nick(const Messenger *m, int group_number, const uint8_t *nick, uint16_t length)
|
|
{
|
|
const GC_Session *c = m->group_handler;
|
|
const GC_Chat *chat = gc_get_group(c, group_number);
|
|
|
|
if (chat == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
if (length > MAX_GC_NICK_SIZE) {
|
|
return -2;
|
|
}
|
|
|
|
if (length == 0 || nick == nullptr) {
|
|
return -3;
|
|
}
|
|
|
|
if (!self_gc_set_nick(chat, nick, length)) {
|
|
return -2;
|
|
}
|
|
|
|
if (!send_gc_broadcast_message(chat, nick, length, GM_NICK)) {
|
|
return -4;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool gc_get_peer_nick(const GC_Chat *chat, uint32_t peer_id, uint8_t *name)
|
|
{
|
|
const int peer_number = get_peer_number_of_peer_id(chat, peer_id);
|
|
|
|
const GC_Peer *peer = get_gc_peer(chat, peer_number);
|
|
|
|
if (peer == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
if (name != nullptr) {
|
|
memcpy(name, peer->nick, peer->nick_length);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
int gc_get_peer_nick_size(const GC_Chat *chat, uint32_t peer_id)
|
|
{
|
|
const int peer_number = get_peer_number_of_peer_id(chat, peer_id);
|
|
|
|
const GC_Peer *peer = get_gc_peer(chat, peer_number);
|
|
|
|
if (peer == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
return peer->nick_length;
|
|
}
|
|
|
|
/** @brief Handles a nick change broadcast.
|
|
*
|
|
* Return 0 if packet is handled correctly.
|
|
* Return -1 on failure.
|
|
*/
|
|
non_null(1, 2, 3, 4) nullable(6)
|
|
static int handle_gc_nick(const GC_Session *c, GC_Chat *chat, GC_Peer *peer, const uint8_t *nick,
|
|
uint16_t length, void *userdata)
|
|
{
|
|
/* If this happens malicious behaviour is highly suspect */
|
|
if (length == 0 || length > MAX_GC_NICK_SIZE) {
|
|
GC_Connection *gconn = &peer->gconn;
|
|
gcc_mark_for_deletion(gconn, chat->tcp_conn, GC_EXIT_TYPE_SYNC_ERR, nullptr, 0);
|
|
LOGGER_WARNING(chat->log, "Invalid nick length for nick: %s (%u)", nick, length);
|
|
return -1;
|
|
}
|
|
|
|
memcpy(peer->nick, nick, length);
|
|
peer->nick_length = length;
|
|
|
|
if (c->nick_change != nullptr) {
|
|
c->nick_change(c->messenger, chat->group_number, peer->peer_id, nick, length, userdata);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Copies peer_number's public key to `public_key`.
|
|
*
|
|
* Returns 0 on success.
|
|
* Returns -1 if peer_number is invalid.
|
|
* Returns -2 if `public_key` is null.
|
|
*/
|
|
non_null()
|
|
static int get_gc_peer_public_key(const GC_Chat *chat, uint32_t peer_number, uint8_t *public_key)
|
|
{
|
|
const GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
if (public_key == nullptr) {
|
|
return -2;
|
|
}
|
|
|
|
memcpy(public_key, gconn->addr.public_key, ENC_PUBLIC_KEY_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gc_get_peer_public_key_by_peer_id(const GC_Chat *chat, uint32_t peer_id, uint8_t *public_key)
|
|
{
|
|
const int peer_number = get_peer_number_of_peer_id(chat, peer_id);
|
|
|
|
const GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
if (public_key == nullptr) {
|
|
return -2;
|
|
}
|
|
|
|
memcpy(public_key, gconn->addr.public_key, ENC_PUBLIC_KEY_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned int gc_get_peer_connection_status(const GC_Chat *chat, uint32_t peer_id)
|
|
{
|
|
const int peer_number = get_peer_number_of_peer_id(chat, peer_id);
|
|
|
|
if (peer_number_is_self(peer_number)) { // we cannot have a connection with ourselves
|
|
return 0;
|
|
}
|
|
|
|
const GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
return 0;
|
|
}
|
|
|
|
if (gcc_conn_is_direct(chat->mono_time, gconn)) {
|
|
return 2;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/** @brief Creates a topic packet and puts it in data.
|
|
*
|
|
* Packet includes the topic, topic length, public signature key of the
|
|
* setter, topic version, and the signature.
|
|
*
|
|
* Returns packet length on success.
|
|
* Returns -1 on failure.
|
|
*/
|
|
non_null()
|
|
static int make_gc_topic_packet(const GC_Chat *chat, uint8_t *data, uint16_t length)
|
|
{
|
|
if (length < SIGNATURE_SIZE + chat->topic_info.length + GC_MIN_PACKED_TOPIC_INFO_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
memcpy(data, chat->topic_sig, SIGNATURE_SIZE);
|
|
uint16_t data_length = SIGNATURE_SIZE;
|
|
|
|
const uint16_t packed_len = pack_gc_topic_info(data + data_length, length - data_length, &chat->topic_info);
|
|
data_length += packed_len;
|
|
|
|
if (packed_len != chat->topic_info.length + GC_MIN_PACKED_TOPIC_INFO_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
return data_length;
|
|
}
|
|
|
|
/** @brief Sends the group topic to peer.
|
|
*
|
|
* Returns true on success.
|
|
*/
|
|
non_null()
|
|
static bool send_peer_topic(const GC_Chat *chat, GC_Connection *gconn)
|
|
{
|
|
const uint16_t packet_buf_size = SIGNATURE_SIZE + chat->topic_info.length + GC_MIN_PACKED_TOPIC_INFO_SIZE;
|
|
uint8_t *packet = (uint8_t *)malloc(packet_buf_size);
|
|
|
|
if (packet == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
const int packet_len = make_gc_topic_packet(chat, packet, packet_buf_size);
|
|
|
|
if (packet_len != packet_buf_size) {
|
|
free(packet);
|
|
return false;
|
|
}
|
|
|
|
if (!send_lossless_group_packet(chat, gconn, packet, packet_buf_size, GP_TOPIC)) {
|
|
free(packet);
|
|
return false;
|
|
}
|
|
|
|
free(packet);
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @brief Initiates a session key rotation with peer designated by `gconn`.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null()
|
|
static bool send_peer_key_rotation_request(const GC_Chat *chat, GC_Connection *gconn)
|
|
{
|
|
// Only the peer closest to the chat_id sends requests. This is to prevent both peers from sending
|
|
// requests at the same time and ending up with a different resulting shared key
|
|
if (!gconn->self_is_closer) {
|
|
// if this peer hasn't sent us a rotation request in a reasonable timeframe we drop their connection
|
|
if (mono_time_is_timeout(chat->mono_time, gconn->last_key_rotation, GC_KEY_ROTATION_TIMEOUT + GC_PING_TIMEOUT)) {
|
|
gcc_mark_for_deletion(gconn, chat->tcp_conn, GC_EXIT_TYPE_TIMEOUT, nullptr, 0);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
uint8_t packet[1 + ENC_PUBLIC_KEY_SIZE];
|
|
|
|
net_pack_bool(&packet[0], false); // request type
|
|
|
|
create_gc_session_keypair(chat->log, chat->rng, gconn->session_public_key, gconn->session_secret_key);
|
|
|
|
// copy new session public key to packet
|
|
memcpy(packet + 1, gconn->session_public_key, ENC_PUBLIC_KEY_SIZE);
|
|
|
|
if (!send_lossless_group_packet(chat, gconn, packet, sizeof(packet), GP_KEY_ROTATION)) {
|
|
return false;
|
|
}
|
|
|
|
gconn->pending_key_rotation_request = true;
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Sends the group topic to all group members.
|
|
*
|
|
* Returns true on success.
|
|
*/
|
|
non_null()
|
|
static bool broadcast_gc_topic(const GC_Chat *chat)
|
|
{
|
|
const uint16_t packet_buf_size = SIGNATURE_SIZE + chat->topic_info.length + GC_MIN_PACKED_TOPIC_INFO_SIZE;
|
|
uint8_t *packet = (uint8_t *)malloc(packet_buf_size);
|
|
|
|
if (packet == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
const int packet_len = make_gc_topic_packet(chat, packet, packet_buf_size);
|
|
|
|
if (packet_len != packet_buf_size) {
|
|
free(packet);
|
|
return false;
|
|
}
|
|
|
|
send_gc_lossless_packet_all_peers(chat, packet, packet_buf_size, GP_TOPIC);
|
|
|
|
free(packet);
|
|
|
|
return true;
|
|
}
|
|
|
|
int gc_set_topic(GC_Chat *chat, const uint8_t *topic, uint16_t length)
|
|
{
|
|
if (length > MAX_GC_TOPIC_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
const bool topic_lock_enabled = group_topic_lock_enabled(chat);
|
|
|
|
if (topic_lock_enabled && gc_get_self_role(chat) > GR_MODERATOR) {
|
|
return -2;
|
|
}
|
|
|
|
if (gc_get_self_role(chat) > GR_USER) {
|
|
return -2;
|
|
}
|
|
|
|
const GC_TopicInfo old_topic_info = chat->topic_info;
|
|
|
|
uint8_t old_topic_sig[SIGNATURE_SIZE];
|
|
memcpy(old_topic_sig, chat->topic_sig, SIGNATURE_SIZE);
|
|
|
|
// TODO(jfreegman): improbable, but an overflow would break topic setting
|
|
if (chat->topic_info.version == UINT32_MAX) {
|
|
return -3;
|
|
}
|
|
|
|
// only increment topic version when lock is enabled
|
|
if (topic_lock_enabled) {
|
|
++chat->topic_info.version;
|
|
}
|
|
|
|
chat->topic_info.length = length;
|
|
|
|
if (length > 0) {
|
|
assert(topic != nullptr);
|
|
memcpy(chat->topic_info.topic, topic, length);
|
|
} else {
|
|
memset(chat->topic_info.topic, 0, sizeof(chat->topic_info.topic));
|
|
}
|
|
|
|
memcpy(chat->topic_info.public_sig_key, get_sig_pk(chat->self_public_key), SIG_PUBLIC_KEY_SIZE);
|
|
|
|
chat->topic_info.checksum = get_gc_topic_checksum(&chat->topic_info);
|
|
|
|
const uint16_t packet_buf_size = length + GC_MIN_PACKED_TOPIC_INFO_SIZE;
|
|
uint8_t *packed_topic = (uint8_t *)malloc(packet_buf_size);
|
|
|
|
if (packed_topic == nullptr) {
|
|
return -3;
|
|
}
|
|
|
|
int err = -3;
|
|
|
|
const uint16_t packed_len = pack_gc_topic_info(packed_topic, packet_buf_size, &chat->topic_info);
|
|
|
|
if (packed_len != packet_buf_size) {
|
|
goto ON_ERROR;
|
|
}
|
|
|
|
if (crypto_sign_detached(chat->topic_sig, nullptr, packed_topic, packet_buf_size,
|
|
get_sig_sk(chat->self_secret_key)) == -1) {
|
|
goto ON_ERROR;
|
|
}
|
|
|
|
if (!broadcast_gc_topic(chat)) {
|
|
err = -4;
|
|
goto ON_ERROR;
|
|
}
|
|
|
|
chat->topic_prev_checksum = old_topic_info.checksum;
|
|
chat->topic_time_set = mono_time_get(chat->mono_time);
|
|
|
|
free(packed_topic);
|
|
return 0;
|
|
|
|
ON_ERROR:
|
|
chat->topic_info = old_topic_info;
|
|
memcpy(chat->topic_sig, old_topic_sig, SIGNATURE_SIZE);
|
|
free(packed_topic);
|
|
return err;
|
|
}
|
|
|
|
void gc_get_topic(const GC_Chat *chat, uint8_t *topic)
|
|
{
|
|
if (topic != nullptr) {
|
|
memcpy(topic, chat->topic_info.topic, chat->topic_info.length);
|
|
}
|
|
}
|
|
|
|
uint16_t gc_get_topic_size(const GC_Chat *chat)
|
|
{
|
|
return chat->topic_info.length;
|
|
}
|
|
|
|
/**
|
|
* If public_sig_key is equal to the key of the topic setter, replaces topic credentials
|
|
* and re-broadcasts the updated topic info to the group.
|
|
*
|
|
* Returns true on success
|
|
*/
|
|
non_null()
|
|
static bool update_gc_topic(GC_Chat *chat, const uint8_t *public_sig_key)
|
|
{
|
|
if (memcmp(public_sig_key, chat->topic_info.public_sig_key, SIG_PUBLIC_KEY_SIZE) != 0) {
|
|
return true;
|
|
}
|
|
|
|
return gc_set_topic(chat, chat->topic_info.topic, chat->topic_info.length) == 0;
|
|
}
|
|
|
|
/** @brief Validates `topic_info`.
|
|
*
|
|
* Return true if topic info is valid.
|
|
*/
|
|
non_null()
|
|
static bool handle_gc_topic_validate(const GC_Chat *chat, const GC_Peer *peer, const GC_TopicInfo *topic_info,
|
|
bool topic_lock_enabled)
|
|
{
|
|
if (topic_info->checksum != get_gc_topic_checksum(topic_info)) {
|
|
LOGGER_WARNING(chat->log, "received invalid topic checksum");
|
|
return false;
|
|
}
|
|
|
|
if (topic_lock_enabled) {
|
|
if (!mod_list_verify_sig_pk(&chat->moderation, topic_info->public_sig_key)) {
|
|
LOGGER_DEBUG(chat->log, "Invalid topic signature (bad credentials)");
|
|
return false;
|
|
}
|
|
|
|
if (topic_info->version < chat->topic_info.version) {
|
|
return false;
|
|
}
|
|
} else {
|
|
uint8_t public_enc_key[ENC_PUBLIC_KEY_SIZE];
|
|
|
|
if (gc_get_enc_pk_from_sig_pk(chat, public_enc_key, topic_info->public_sig_key)) {
|
|
if (sanctions_list_is_observer(&chat->moderation, public_enc_key)) {
|
|
LOGGER_DEBUG(chat->log, "Invalid topic signature (sanctioned peer attempted to change topic)");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (topic_info->version == chat->shared_state.topic_lock) {
|
|
// always accept topic on initial connection
|
|
if (!mono_time_is_timeout(chat->mono_time, chat->time_connected, GC_PING_TIMEOUT)) {
|
|
return true;
|
|
}
|
|
|
|
if (chat->topic_prev_checksum == topic_info->checksum &&
|
|
!mono_time_is_timeout(chat->mono_time, chat->topic_time_set, GC_CONFIRMED_PEER_TIMEOUT)) {
|
|
LOGGER_DEBUG(chat->log, "Topic reversion (probable sync error)");
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// the topic version should never change when the topic lock is disabled except when
|
|
// the founder changes the topic prior to enabling the lock
|
|
if (!(peer->role == GR_FOUNDER && topic_info->version == chat->shared_state.topic_lock + 1)) {
|
|
LOGGER_ERROR(chat->log, "topic version %u differs from topic lock %u", topic_info->version,
|
|
chat->shared_state.topic_lock);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Handles a topic packet.
|
|
*
|
|
* Return 0 if packet is correctly handled.
|
|
* Return -1 if packet has invalid size.
|
|
*/
|
|
non_null(1, 2, 3, 4) nullable(6)
|
|
static int handle_gc_topic(const GC_Session *c, GC_Chat *chat, const GC_Peer *peer, const uint8_t *data,
|
|
uint16_t length, void *userdata)
|
|
{
|
|
if (length < SIGNATURE_SIZE + GC_MIN_PACKED_TOPIC_INFO_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
const uint16_t old_checksum = chat->topic_info.checksum;
|
|
|
|
GC_TopicInfo topic_info;
|
|
|
|
if (unpack_gc_topic_info(&topic_info, data + SIGNATURE_SIZE, length - SIGNATURE_SIZE) == -1) {
|
|
LOGGER_WARNING(chat->log, "failed to unpack topic");
|
|
return 0;
|
|
}
|
|
|
|
const uint8_t *signature = data;
|
|
|
|
if (crypto_sign_verify_detached(signature, data + SIGNATURE_SIZE, length - SIGNATURE_SIZE,
|
|
topic_info.public_sig_key) == -1) {
|
|
LOGGER_WARNING(chat->log, "failed to verify topic signature");
|
|
return 0;
|
|
}
|
|
|
|
const bool topic_lock_enabled = group_topic_lock_enabled(chat);
|
|
|
|
if (!handle_gc_topic_validate(chat, peer, &topic_info, topic_lock_enabled)) {
|
|
return 0;
|
|
}
|
|
|
|
// prevents sync issues from triggering the callback needlessly
|
|
const bool skip_callback = chat->topic_info.length == topic_info.length
|
|
&& memcmp(chat->topic_info.topic, topic_info.topic, topic_info.length) == 0;
|
|
|
|
chat->topic_prev_checksum = old_checksum;
|
|
chat->topic_time_set = mono_time_get(chat->mono_time);
|
|
chat->topic_info = topic_info;
|
|
memcpy(chat->topic_sig, signature, SIGNATURE_SIZE);
|
|
|
|
if (!skip_callback && chat->connection_state == CS_CONNECTED && c->topic_change != nullptr) {
|
|
const int setter_peer_number = get_peer_number_of_sig_pk(chat, topic_info.public_sig_key);
|
|
const uint32_t peer_id = setter_peer_number >= 0 ? chat->group[setter_peer_number].peer_id : 0;
|
|
|
|
c->topic_change(c->messenger, chat->group_number, peer_id, topic_info.topic, topic_info.length, userdata);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Handles a key exchange packet.
|
|
*
|
|
* Return 0 if packet is handled correctly.
|
|
* Return -1 if length is invalid.
|
|
* Return -2 if we fail to create a new session keypair.
|
|
* Return -3 if response packet fails to send.
|
|
*/
|
|
non_null()
|
|
static int handle_gc_key_exchange(const GC_Chat *chat, GC_Connection *gconn, const uint8_t *data, uint16_t length)
|
|
{
|
|
if (length < 1 + ENC_PUBLIC_KEY_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
bool is_response;
|
|
net_unpack_bool(&data[0], &is_response);
|
|
|
|
const uint8_t *sender_public_session_key = data + 1;
|
|
|
|
if (is_response) {
|
|
if (!gconn->pending_key_rotation_request) {
|
|
LOGGER_WARNING(chat->log, "got unsolicited key rotation response from peer %u", gconn->public_key_hash);
|
|
return 0;
|
|
}
|
|
|
|
// now that we have response we can compute our new shared key and begin using it
|
|
gcc_make_session_shared_key(gconn, sender_public_session_key);
|
|
|
|
gconn->pending_key_rotation_request = false;
|
|
|
|
return 0;
|
|
}
|
|
|
|
// key generation is pretty cpu intensive so we make sure a peer can't DOS us by spamming requests
|
|
if (!mono_time_is_timeout(chat->mono_time, gconn->last_key_rotation, GC_KEY_ROTATION_TIMEOUT / 2)) {
|
|
return 0;
|
|
}
|
|
|
|
uint8_t response[1 + ENC_PUBLIC_KEY_SIZE];
|
|
uint8_t new_session_pk[ENC_PUBLIC_KEY_SIZE];
|
|
uint8_t new_session_sk[ENC_SECRET_KEY_SIZE];
|
|
|
|
net_pack_bool(&response[0], true);
|
|
|
|
crypto_memlock(new_session_sk, sizeof(new_session_sk));
|
|
|
|
create_gc_session_keypair(chat->log, chat->rng, new_session_pk, new_session_sk);
|
|
|
|
memcpy(response + 1, new_session_pk, ENC_PUBLIC_KEY_SIZE);
|
|
|
|
if (!send_lossless_group_packet(chat, gconn, response, sizeof(response), GP_KEY_ROTATION)) {
|
|
return -3;
|
|
}
|
|
|
|
// save new keys and compute new shared key AFTER sending response packet with old key
|
|
memcpy(gconn->session_public_key, new_session_pk, sizeof(gconn->session_public_key));
|
|
memcpy(gconn->session_secret_key, new_session_sk, sizeof(gconn->session_secret_key));
|
|
|
|
gcc_make_session_shared_key(gconn, sender_public_session_key);
|
|
|
|
crypto_memunlock(new_session_sk, sizeof(new_session_sk));
|
|
|
|
gconn->last_key_rotation = mono_time_get(chat->mono_time);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void gc_get_group_name(const GC_Chat *chat, uint8_t *group_name)
|
|
{
|
|
if (group_name != nullptr) {
|
|
memcpy(group_name, chat->shared_state.group_name, chat->shared_state.group_name_len);
|
|
}
|
|
}
|
|
|
|
uint16_t gc_get_group_name_size(const GC_Chat *chat)
|
|
{
|
|
return chat->shared_state.group_name_len;
|
|
}
|
|
|
|
void gc_get_password(const GC_Chat *chat, uint8_t *password)
|
|
{
|
|
if (password != nullptr) {
|
|
memcpy(password, chat->shared_state.password, chat->shared_state.password_length);
|
|
}
|
|
}
|
|
|
|
uint16_t gc_get_password_size(const GC_Chat *chat)
|
|
{
|
|
return chat->shared_state.password_length;
|
|
}
|
|
|
|
int gc_founder_set_password(GC_Chat *chat, const uint8_t *password, uint16_t password_length)
|
|
{
|
|
if (!self_gc_is_founder(chat)) {
|
|
return -1;
|
|
}
|
|
|
|
uint8_t *oldpasswd = nullptr;
|
|
const uint16_t oldlen = chat->shared_state.password_length;
|
|
|
|
if (oldlen > 0) {
|
|
oldpasswd = (uint8_t *)malloc(oldlen);
|
|
|
|
if (oldpasswd == nullptr) {
|
|
return -4;
|
|
}
|
|
|
|
memcpy(oldpasswd, chat->shared_state.password, oldlen);
|
|
}
|
|
|
|
if (!set_gc_password_local(chat, password, password_length)) {
|
|
free(oldpasswd);
|
|
return -2;
|
|
}
|
|
|
|
if (!sign_gc_shared_state(chat)) {
|
|
set_gc_password_local(chat, oldpasswd, oldlen);
|
|
free(oldpasswd);
|
|
return -2;
|
|
}
|
|
|
|
free(oldpasswd);
|
|
|
|
if (!broadcast_gc_shared_state(chat)) {
|
|
return -3;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Validates change to moderator list and either adds or removes peer from our moderator list.
|
|
*
|
|
* Return target's peer number on success.
|
|
* Return -1 on packet handle failure.
|
|
* Return -2 if target peer is not online.
|
|
* Return -3 if target peer is not a valid role (probably indicates sync issues).
|
|
* Return -4 on validation failure.
|
|
*/
|
|
non_null()
|
|
static int validate_unpack_gc_set_mod(GC_Chat *chat, uint32_t peer_number, const uint8_t *data, uint16_t length,
|
|
bool add_mod)
|
|
{
|
|
int target_peer_number;
|
|
uint8_t mod_data[MOD_LIST_ENTRY_SIZE];
|
|
|
|
if (add_mod) {
|
|
if (length < 1 + MOD_LIST_ENTRY_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
memcpy(mod_data, data + 1, MOD_MODERATION_HASH_SIZE);
|
|
target_peer_number = get_peer_number_of_sig_pk(chat, mod_data);
|
|
|
|
if (!gc_peer_number_is_valid(chat, target_peer_number)) {
|
|
return -2;
|
|
}
|
|
|
|
const Group_Role target_role = chat->group[target_peer_number].role;
|
|
|
|
if (target_role != GR_USER) {
|
|
return -3;
|
|
}
|
|
|
|
if (!mod_list_add_entry(&chat->moderation, mod_data)) {
|
|
return -4;
|
|
}
|
|
} else {
|
|
memcpy(mod_data, data + 1, SIG_PUBLIC_KEY_SIZE);
|
|
target_peer_number = get_peer_number_of_sig_pk(chat, mod_data);
|
|
|
|
if (!gc_peer_number_is_valid(chat, target_peer_number)) {
|
|
return -2;
|
|
}
|
|
|
|
const Group_Role target_role = chat->group[target_peer_number].role;
|
|
|
|
if (target_role != GR_MODERATOR) {
|
|
return -3;
|
|
}
|
|
|
|
if (!mod_list_remove_entry(&chat->moderation, mod_data)) {
|
|
return -4;
|
|
}
|
|
}
|
|
|
|
update_gc_peer_roles(chat);
|
|
|
|
return target_peer_number;
|
|
}
|
|
|
|
/** @brief Handles a moderator set broadcast.
|
|
*
|
|
* Return 0 if packet is handled correctly.
|
|
* Return -1 if packet has invalid size.
|
|
* Return -2 if the packet contains invalid data.
|
|
* Return -3 if `peer_number` does not designate a valid peer.
|
|
*/
|
|
non_null(1, 2, 4) nullable(6)
|
|
static int handle_gc_set_mod(const GC_Session *c, GC_Chat *chat, uint32_t peer_number, const uint8_t *data,
|
|
uint16_t length, void *userdata)
|
|
{
|
|
if (length < 1 + SIG_PUBLIC_KEY_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
const GC_Peer *setter_peer = get_gc_peer(chat, peer_number);
|
|
|
|
if (setter_peer == nullptr) {
|
|
return -3;
|
|
}
|
|
|
|
if (setter_peer->role != GR_FOUNDER) {
|
|
return 0;
|
|
}
|
|
|
|
bool add_mod;
|
|
net_unpack_bool(&data[0], &add_mod);
|
|
|
|
const int target_peer_number = validate_unpack_gc_set_mod(chat, peer_number, data, length, add_mod);
|
|
|
|
if (target_peer_number == -1) {
|
|
return -2;
|
|
}
|
|
|
|
const GC_Peer *target_peer = get_gc_peer(chat, target_peer_number);
|
|
|
|
if (target_peer == nullptr) {
|
|
return 0;
|
|
}
|
|
|
|
if (c->moderation != nullptr) {
|
|
c->moderation(c->messenger, chat->group_number, setter_peer->peer_id, target_peer->peer_id,
|
|
add_mod ? MV_MOD : MV_USER, userdata);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Sends a set mod broadcast to the group.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null()
|
|
static bool send_gc_set_mod(const GC_Chat *chat, const GC_Connection *gconn, bool add_mod)
|
|
{
|
|
const uint16_t length = 1 + SIG_PUBLIC_KEY_SIZE;
|
|
uint8_t *data = (uint8_t *)malloc(length);
|
|
|
|
if (data == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
net_pack_bool(&data[0], add_mod);
|
|
|
|
memcpy(data + 1, get_sig_pk(gconn->addr.public_key), SIG_PUBLIC_KEY_SIZE);
|
|
|
|
if (!send_gc_broadcast_message(chat, data, length, GM_SET_MOD)) {
|
|
free(data);
|
|
return false;
|
|
}
|
|
|
|
free(data);
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Adds or removes the peer designated by gconn from moderator list if `add_mod` is true or false respectively.
|
|
* Re-signs and re-distributes an updated mod_list hash.
|
|
*
|
|
* Returns true on success.
|
|
*/
|
|
non_null()
|
|
static bool founder_gc_set_moderator(GC_Chat *chat, const GC_Connection *gconn, bool add_mod)
|
|
{
|
|
if (!self_gc_is_founder(chat)) {
|
|
return false;
|
|
}
|
|
|
|
if (add_mod) {
|
|
if (chat->moderation.num_mods >= MOD_MAX_NUM_MODERATORS) {
|
|
if (!prune_gc_mod_list(chat)) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (!mod_list_add_entry(&chat->moderation, get_sig_pk(gconn->addr.public_key))) {
|
|
return false;
|
|
}
|
|
} else {
|
|
if (!mod_list_remove_entry(&chat->moderation, get_sig_pk(gconn->addr.public_key))) {
|
|
return false;
|
|
}
|
|
|
|
if (!update_gc_sanctions_list(chat, get_sig_pk(gconn->addr.public_key))
|
|
|| !update_gc_topic(chat, get_sig_pk(gconn->addr.public_key))) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
uint8_t old_hash[MOD_MODERATION_HASH_SIZE];
|
|
memcpy(old_hash, chat->shared_state.mod_list_hash, MOD_MODERATION_HASH_SIZE);
|
|
|
|
if (!mod_list_make_hash(&chat->moderation, chat->shared_state.mod_list_hash)) {
|
|
return false;
|
|
}
|
|
|
|
if (!sign_gc_shared_state(chat) || !broadcast_gc_shared_state(chat)) {
|
|
memcpy(chat->shared_state.mod_list_hash, old_hash, MOD_MODERATION_HASH_SIZE);
|
|
return false;
|
|
}
|
|
|
|
return send_gc_set_mod(chat, gconn, add_mod);
|
|
}
|
|
|
|
/** @brief Validates `data` containing a change for the sanction list and unpacks it
|
|
* into the sanctions list for `chat`.
|
|
*
|
|
* if `add_obs` is true we're adding an observer to the list.
|
|
*
|
|
* Return 1 if sanctions list is not modified.
|
|
* Return 0 if data is valid and sanctions list is successfully modified.
|
|
* Return -1 if data is invalid format.
|
|
*/
|
|
non_null()
|
|
static int validate_unpack_observer_entry(GC_Chat *chat, const uint8_t *data, uint16_t length,
|
|
const uint8_t *public_key, bool add_obs)
|
|
{
|
|
Mod_Sanction_Creds creds;
|
|
|
|
if (add_obs) {
|
|
Mod_Sanction sanction;
|
|
|
|
if (sanctions_list_unpack(&sanction, &creds, 1, data, length, nullptr) != 1) {
|
|
return -1;
|
|
}
|
|
|
|
// this may occur if two mods change the sanctions list at the exact same time
|
|
if (creds.version == chat->moderation.sanctions_creds.version
|
|
&& creds.checksum <= chat->moderation.sanctions_creds.checksum) {
|
|
return 1;
|
|
}
|
|
|
|
if (sanctions_list_entry_exists(&chat->moderation, &sanction)
|
|
|| !sanctions_list_add_entry(&chat->moderation, &sanction, &creds)) {
|
|
return -1;
|
|
}
|
|
} else {
|
|
if (length < MOD_SANCTIONS_CREDS_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
if (sanctions_creds_unpack(&creds, data) != MOD_SANCTIONS_CREDS_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
if (creds.version == chat->moderation.sanctions_creds.version
|
|
&& creds.checksum <= chat->moderation.sanctions_creds.checksum) {
|
|
return 1;
|
|
}
|
|
|
|
if (!sanctions_list_is_observer(&chat->moderation, public_key)
|
|
|| !sanctions_list_remove_observer(&chat->moderation, public_key, &creds)) {
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Handles a set observer broadcast.
|
|
*
|
|
* Return 0 if packet is handled correctly.
|
|
* Return -1 if packet has invalid size.
|
|
* Return -2 if the packet contains invalid data.
|
|
* Return -3 if `peer_number` does not designate a valid peer.
|
|
*/
|
|
non_null(1, 2, 4) nullable(6)
|
|
static int handle_gc_set_observer(const GC_Session *c, GC_Chat *chat, uint32_t peer_number, const uint8_t *data,
|
|
uint16_t length, void *userdata)
|
|
{
|
|
if (length <= 1 + EXT_PUBLIC_KEY_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
const GC_Peer *setter_peer = get_gc_peer(chat, peer_number);
|
|
|
|
if (setter_peer == nullptr) {
|
|
return -3;
|
|
}
|
|
|
|
if (setter_peer->role > GR_MODERATOR) {
|
|
LOGGER_DEBUG(chat->log, "peer with insufficient permissions tried to modify sanctions list");
|
|
return 0;
|
|
}
|
|
|
|
bool add_obs;
|
|
net_unpack_bool(&data[0], &add_obs);
|
|
|
|
const uint8_t *public_key = data + 1;
|
|
|
|
const int target_peer_number = get_peer_number_of_enc_pk(chat, public_key, false);
|
|
|
|
if (target_peer_number >= 0 && (uint32_t)target_peer_number == peer_number) {
|
|
return -2;
|
|
}
|
|
|
|
const GC_Peer *target_peer = get_gc_peer(chat, target_peer_number);
|
|
|
|
if (target_peer != nullptr) {
|
|
if ((add_obs && target_peer->role != GR_USER) || (!add_obs && target_peer->role != GR_OBSERVER)) {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
const int ret = validate_unpack_observer_entry(chat,
|
|
data + 1 + EXT_PUBLIC_KEY_SIZE,
|
|
length - 1 - EXT_PUBLIC_KEY_SIZE,
|
|
public_key, add_obs);
|
|
|
|
if (ret == -1) {
|
|
return -2;
|
|
}
|
|
|
|
|
|
if (ret == 1) {
|
|
return 0;
|
|
}
|
|
|
|
update_gc_peer_roles(chat);
|
|
|
|
if (target_peer != nullptr) {
|
|
if (c->moderation != nullptr) {
|
|
c->moderation(c->messenger, chat->group_number, setter_peer->peer_id, target_peer->peer_id,
|
|
add_obs ? MV_OBSERVER : MV_USER, userdata);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Broadcasts observer role data to the group.
|
|
*
|
|
* Returns true on success.
|
|
*/
|
|
non_null()
|
|
static bool send_gc_set_observer(const GC_Chat *chat, const uint8_t *target_ext_pk, const uint8_t *sanction_data,
|
|
uint16_t length, bool add_obs)
|
|
{
|
|
const uint16_t packet_len = 1 + EXT_PUBLIC_KEY_SIZE + length;
|
|
uint8_t *packet = (uint8_t *)malloc(packet_len);
|
|
|
|
if (packet == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
net_pack_bool(&packet[0], add_obs);
|
|
|
|
memcpy(packet + 1, target_ext_pk, EXT_PUBLIC_KEY_SIZE);
|
|
memcpy(packet + 1 + EXT_PUBLIC_KEY_SIZE, sanction_data, length);
|
|
|
|
if (!send_gc_broadcast_message(chat, packet, packet_len, GM_SET_OBSERVER)) {
|
|
free(packet);
|
|
return false;
|
|
}
|
|
|
|
free(packet);
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Adds or removes peer_number from the observer list if add_obs is true or false respectively.
|
|
* Broadcasts this change to the entire group.
|
|
*
|
|
* Returns true on success.
|
|
*/
|
|
non_null()
|
|
static bool mod_gc_set_observer(GC_Chat *chat, uint32_t peer_number, bool add_obs)
|
|
{
|
|
const GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
if (gc_get_self_role(chat) >= GR_USER) {
|
|
return false;
|
|
}
|
|
|
|
uint8_t sanction_data[MOD_SANCTION_PACKED_SIZE + MOD_SANCTIONS_CREDS_SIZE];
|
|
uint16_t length = 0;
|
|
|
|
if (add_obs) {
|
|
if (chat->moderation.num_sanctions >= MOD_MAX_NUM_SANCTIONS) {
|
|
if (!prune_gc_sanctions_list(chat)) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// if sanctioned peer set the topic we need to overwrite his signature and redistribute
|
|
// topic info
|
|
const int setter_peer_number = get_peer_number_of_sig_pk(chat, chat->topic_info.public_sig_key);
|
|
|
|
if (setter_peer_number >= 0 && (uint32_t)setter_peer_number == peer_number) {
|
|
if (gc_set_topic(chat, chat->topic_info.topic, chat->topic_info.length) != 0) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
Mod_Sanction sanction;
|
|
|
|
if (!sanctions_list_make_entry(&chat->moderation, gconn->addr.public_key, &sanction, SA_OBSERVER)) {
|
|
LOGGER_WARNING(chat->log, "sanctions_list_make_entry failed in mod_gc_set_observer");
|
|
return false;
|
|
}
|
|
|
|
const int packed_len = sanctions_list_pack(sanction_data, sizeof(sanction_data), &sanction, 1,
|
|
&chat->moderation.sanctions_creds);
|
|
|
|
if (packed_len == -1) {
|
|
return false;
|
|
}
|
|
|
|
length += packed_len;
|
|
} else {
|
|
if (!sanctions_list_remove_observer(&chat->moderation, gconn->addr.public_key, nullptr)) {
|
|
LOGGER_WARNING(chat->log, "failed to remove sanction");
|
|
return false;
|
|
}
|
|
|
|
const uint16_t packed_len = sanctions_creds_pack(&chat->moderation.sanctions_creds, sanction_data);
|
|
|
|
if (packed_len != MOD_SANCTIONS_CREDS_SIZE) {
|
|
return false;
|
|
}
|
|
|
|
length += packed_len;
|
|
}
|
|
|
|
if (length > sizeof(sanction_data)) {
|
|
LOGGER_FATAL(chat->log, "Invalid sanction data length: %u", length);
|
|
return false;
|
|
}
|
|
|
|
update_gc_peer_roles(chat);
|
|
|
|
return send_gc_set_observer(chat, gconn->addr.public_key, sanction_data, length, add_obs);
|
|
}
|
|
|
|
/** @brief Sets the role of `peer_number` to `new_role`. If necessary this function will first
|
|
* remove the peer's current role before applying the new one.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null()
|
|
static bool apply_new_gc_role(GC_Chat *chat, uint32_t peer_number, Group_Role current_role, Group_Role new_role)
|
|
{
|
|
const GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
switch (current_role) {
|
|
case GR_MODERATOR: {
|
|
if (!founder_gc_set_moderator(chat, gconn, false)) {
|
|
return false;
|
|
}
|
|
|
|
update_gc_peer_roles(chat);
|
|
|
|
if (new_role == GR_OBSERVER) {
|
|
return mod_gc_set_observer(chat, peer_number, true);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case GR_OBSERVER: {
|
|
if (!mod_gc_set_observer(chat, peer_number, false)) {
|
|
return false;
|
|
}
|
|
|
|
update_gc_peer_roles(chat);
|
|
|
|
if (new_role == GR_MODERATOR) {
|
|
return founder_gc_set_moderator(chat, gconn, true);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case GR_USER: {
|
|
if (new_role == GR_MODERATOR) {
|
|
return founder_gc_set_moderator(chat, gconn, true);
|
|
} else if (new_role == GR_OBSERVER) {
|
|
return mod_gc_set_observer(chat, peer_number, true);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case GR_FOUNDER:
|
|
|
|
// Intentional fallthrough
|
|
default: {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
int gc_set_peer_role(const Messenger *m, int group_number, uint32_t peer_id, Group_Role new_role)
|
|
{
|
|
const GC_Session *c = m->group_handler;
|
|
GC_Chat *chat = gc_get_group(c, group_number);
|
|
|
|
if (chat == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
const int peer_number = get_peer_number_of_peer_id(chat, peer_id);
|
|
|
|
const GC_Peer *peer = get_gc_peer(chat, peer_number);
|
|
|
|
if (peer == nullptr) {
|
|
return -2;
|
|
}
|
|
|
|
const GC_Connection *gconn = &peer->gconn;
|
|
|
|
if (!gconn->confirmed) {
|
|
return -2;
|
|
}
|
|
|
|
const Group_Role current_role = peer->role;
|
|
|
|
if (new_role == GR_FOUNDER || peer->role == new_role) {
|
|
return -4;
|
|
}
|
|
|
|
if (peer_number_is_self(peer_number)) {
|
|
return -6;
|
|
}
|
|
|
|
if (current_role == GR_FOUNDER || gc_get_self_role(chat) >= GR_USER) {
|
|
return -3;
|
|
}
|
|
|
|
// moderators can't demote moderators or promote peers to moderator
|
|
if (!self_gc_is_founder(chat) && (new_role == GR_MODERATOR || current_role == GR_MODERATOR)) {
|
|
return -3;
|
|
}
|
|
|
|
if (!apply_new_gc_role(chat, peer_number, current_role, new_role)) {
|
|
return -5;
|
|
}
|
|
|
|
update_gc_peer_roles(chat);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Return true if topic lock is enabled */
|
|
non_null()
|
|
static bool group_topic_lock_enabled(const GC_Chat *chat)
|
|
{
|
|
return chat->shared_state.topic_lock == GC_TOPIC_LOCK_ENABLED;
|
|
}
|
|
|
|
Group_Privacy_State gc_get_privacy_state(const GC_Chat *chat)
|
|
{
|
|
return chat->shared_state.privacy_state;
|
|
}
|
|
|
|
Group_Topic_Lock gc_get_topic_lock_state(const GC_Chat *chat)
|
|
{
|
|
return group_topic_lock_enabled(chat) ? TL_ENABLED : TL_DISABLED;
|
|
}
|
|
|
|
Group_Voice_State gc_get_voice_state(const GC_Chat *chat)
|
|
{
|
|
return chat->shared_state.voice_state;
|
|
}
|
|
|
|
int gc_founder_set_topic_lock(const Messenger *m, int group_number, Group_Topic_Lock new_lock_state)
|
|
{
|
|
const GC_Session *c = m->group_handler;
|
|
GC_Chat *chat = gc_get_group(c, group_number);
|
|
|
|
if (chat == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
if (new_lock_state > TL_DISABLED) {
|
|
return -2;
|
|
}
|
|
|
|
if (!self_gc_is_founder(chat)) {
|
|
return -3;
|
|
}
|
|
|
|
if (chat->connection_state <= CS_DISCONNECTED) {
|
|
return -4;
|
|
}
|
|
|
|
const Group_Topic_Lock old_lock_state = gc_get_topic_lock_state(chat);
|
|
|
|
if (new_lock_state == old_lock_state) {
|
|
return 0;
|
|
}
|
|
|
|
const uint32_t old_topic_lock = chat->shared_state.topic_lock;
|
|
|
|
// If we're enabling the lock the founder needs to sign the current topic and re-broadcast
|
|
// it with a new version. This needs to happen before we re-broadcast the shared state because
|
|
// if it fails we don't want to enable the topic lock with an invalid topic signature or version.
|
|
if (new_lock_state == TL_ENABLED) {
|
|
chat->shared_state.topic_lock = GC_TOPIC_LOCK_ENABLED;
|
|
|
|
if (gc_set_topic(chat, chat->topic_info.topic, chat->topic_info.length) != 0) {
|
|
chat->shared_state.topic_lock = old_topic_lock;
|
|
return -6;
|
|
}
|
|
} else {
|
|
chat->shared_state.topic_lock = chat->topic_info.version;
|
|
}
|
|
|
|
if (!sign_gc_shared_state(chat)) {
|
|
chat->shared_state.topic_lock = old_topic_lock;
|
|
return -5;
|
|
}
|
|
|
|
if (!broadcast_gc_shared_state(chat)) {
|
|
return -6;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gc_founder_set_voice_state(const Messenger *m, int group_number, Group_Voice_State new_voice_state)
|
|
{
|
|
const GC_Session *c = m->group_handler;
|
|
GC_Chat *chat = gc_get_group(c, group_number);
|
|
|
|
if (chat == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
if (!self_gc_is_founder(chat)) {
|
|
return -2;
|
|
}
|
|
|
|
if (chat->connection_state == CS_DISCONNECTED || chat->connection_state == CS_NONE) {
|
|
return -3;
|
|
}
|
|
|
|
const Group_Voice_State old_voice_state = chat->shared_state.voice_state;
|
|
|
|
if (new_voice_state == old_voice_state) {
|
|
return 0;
|
|
}
|
|
|
|
chat->shared_state.voice_state = new_voice_state;
|
|
|
|
if (!sign_gc_shared_state(chat)) {
|
|
chat->shared_state.voice_state = old_voice_state;
|
|
return -4;
|
|
}
|
|
|
|
if (!broadcast_gc_shared_state(chat)) {
|
|
return -5;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gc_founder_set_privacy_state(const Messenger *m, int group_number, Group_Privacy_State new_privacy_state)
|
|
{
|
|
const GC_Session *c = m->group_handler;
|
|
GC_Chat *chat = gc_get_group(c, group_number);
|
|
|
|
if (chat == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
if (!self_gc_is_founder(chat)) {
|
|
return -2;
|
|
}
|
|
|
|
if (chat->connection_state == CS_DISCONNECTED || chat->connection_state == CS_NONE) {
|
|
return -3;
|
|
}
|
|
|
|
const Group_Privacy_State old_privacy_state = chat->shared_state.privacy_state;
|
|
|
|
if (new_privacy_state == old_privacy_state) {
|
|
return 0;
|
|
}
|
|
|
|
chat->shared_state.privacy_state = new_privacy_state;
|
|
|
|
if (!sign_gc_shared_state(chat)) {
|
|
chat->shared_state.privacy_state = old_privacy_state;
|
|
return -4;
|
|
}
|
|
|
|
if (new_privacy_state == GI_PRIVATE) {
|
|
cleanup_gca(c->announces_list, get_chat_id(chat->chat_public_key));
|
|
kill_group_friend_connection(c, chat);
|
|
chat->join_type = HJ_PRIVATE;
|
|
} else {
|
|
if (!m_create_group_connection(c->messenger, chat)) {
|
|
LOGGER_ERROR(chat->log, "Failed to initialize group friend connection");
|
|
} else {
|
|
chat->update_self_announces = true;
|
|
chat->join_type = HJ_PUBLIC;
|
|
}
|
|
}
|
|
|
|
if (!broadcast_gc_shared_state(chat)) {
|
|
return -5;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
uint16_t gc_get_max_peers(const GC_Chat *chat)
|
|
{
|
|
return chat->shared_state.maxpeers;
|
|
}
|
|
|
|
int gc_founder_set_max_peers(GC_Chat *chat, uint16_t max_peers)
|
|
{
|
|
if (!self_gc_is_founder(chat)) {
|
|
return -1;
|
|
}
|
|
|
|
const uint16_t old_maxpeers = chat->shared_state.maxpeers;
|
|
|
|
if (max_peers == chat->shared_state.maxpeers) {
|
|
return 0;
|
|
}
|
|
|
|
chat->shared_state.maxpeers = max_peers;
|
|
|
|
if (!sign_gc_shared_state(chat)) {
|
|
chat->shared_state.maxpeers = old_maxpeers;
|
|
return -2;
|
|
}
|
|
|
|
if (!broadcast_gc_shared_state(chat)) {
|
|
return -3;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gc_send_message(const GC_Chat *chat, const uint8_t *message, uint16_t length, uint8_t type, uint32_t *message_id)
|
|
{
|
|
if (length > MAX_GC_MESSAGE_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
if (message == nullptr || length == 0) {
|
|
return -2;
|
|
}
|
|
|
|
if (type != GC_MESSAGE_TYPE_NORMAL && type != GC_MESSAGE_TYPE_ACTION) {
|
|
return -3;
|
|
}
|
|
|
|
const GC_Peer *self = get_gc_peer(chat, 0);
|
|
assert(self != nullptr);
|
|
|
|
if (gc_get_self_role(chat) >= GR_OBSERVER || !peer_has_voice(self, chat->shared_state.voice_state)) {
|
|
return -4;
|
|
}
|
|
|
|
const uint8_t packet_type = type == GC_MESSAGE_TYPE_NORMAL ? GM_PLAIN_MESSAGE : GM_ACTION_MESSAGE;
|
|
|
|
const uint16_t length_raw = length + GC_MESSAGE_PSEUDO_ID_SIZE;
|
|
uint8_t *message_raw = (uint8_t *)malloc(length_raw);
|
|
|
|
if (message_raw == nullptr) {
|
|
return -5;
|
|
}
|
|
|
|
const uint32_t pseudo_msg_id = random_u32(chat->rng);
|
|
|
|
net_pack_u32(message_raw, pseudo_msg_id);
|
|
memcpy(message_raw + GC_MESSAGE_PSEUDO_ID_SIZE, message, length);
|
|
|
|
if (!send_gc_broadcast_message(chat, message_raw, length_raw, packet_type)) {
|
|
free(message_raw);
|
|
return -5;
|
|
}
|
|
|
|
if (message_id != nullptr) {
|
|
*message_id = pseudo_msg_id;
|
|
}
|
|
|
|
free(message_raw);
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Handles a message broadcast.
|
|
*
|
|
* Return 0 if packet is handled correctly.
|
|
* Return -1 if packet has invalid size.
|
|
*/
|
|
non_null(1, 2, 3, 4) nullable(7)
|
|
static int handle_gc_message(const GC_Session *c, const GC_Chat *chat, const GC_Peer *peer, const uint8_t *data,
|
|
uint16_t length, uint8_t type, void *userdata)
|
|
{
|
|
if (data == nullptr || length > MAX_GC_MESSAGE_RAW_SIZE || length <= GC_MESSAGE_PSEUDO_ID_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
if (peer->ignore || peer->role >= GR_OBSERVER || !peer_has_voice(peer, chat->shared_state.voice_state)) {
|
|
return 0;
|
|
}
|
|
|
|
if (type != GM_PLAIN_MESSAGE && type != GM_ACTION_MESSAGE) {
|
|
LOGGER_WARNING(chat->log, "received invalid message type: %u", type);
|
|
return 0;
|
|
}
|
|
|
|
const uint8_t cb_type = (type == GM_PLAIN_MESSAGE) ? MESSAGE_NORMAL : MESSAGE_ACTION;
|
|
|
|
uint32_t pseudo_msg_id;
|
|
net_unpack_u32(data, &pseudo_msg_id);
|
|
|
|
if (c->message != nullptr) {
|
|
c->message(c->messenger, chat->group_number, peer->peer_id, cb_type, data + GC_MESSAGE_PSEUDO_ID_SIZE,
|
|
length - GC_MESSAGE_PSEUDO_ID_SIZE, pseudo_msg_id, userdata);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gc_send_private_message(const GC_Chat *chat, uint32_t peer_id, uint8_t type, const uint8_t *message,
|
|
uint16_t length)
|
|
{
|
|
if (length > MAX_GC_MESSAGE_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
if (message == nullptr || length == 0) {
|
|
return -2;
|
|
}
|
|
|
|
const int peer_number = get_peer_number_of_peer_id(chat, peer_id);
|
|
|
|
GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
return -3;
|
|
}
|
|
|
|
if (type > MESSAGE_ACTION) {
|
|
return -4;
|
|
}
|
|
|
|
if (gc_get_self_role(chat) >= GR_OBSERVER) {
|
|
return -5;
|
|
}
|
|
|
|
uint8_t *message_with_type = (uint8_t *)malloc(length + 1);
|
|
|
|
if (message_with_type == nullptr) {
|
|
return -6;
|
|
}
|
|
|
|
message_with_type[0] = type;
|
|
memcpy(message_with_type + 1, message, length);
|
|
|
|
uint8_t *packet = (uint8_t *)malloc(length + 1 + GC_BROADCAST_ENC_HEADER_SIZE);
|
|
|
|
if (packet == nullptr) {
|
|
free(message_with_type);
|
|
return -6;
|
|
}
|
|
|
|
const uint16_t packet_len = make_gc_broadcast_header(message_with_type, length + 1, packet, GM_PRIVATE_MESSAGE);
|
|
|
|
free(message_with_type);
|
|
|
|
if (!send_lossless_group_packet(chat, gconn, packet, packet_len, GP_BROADCAST)) {
|
|
free(packet);
|
|
return -6;
|
|
}
|
|
|
|
free(packet);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Handles a private message.
|
|
*
|
|
* Return 0 if packet is handled correctly.
|
|
* Return -1 if packet has invalid size.
|
|
*/
|
|
non_null(1, 2, 3, 4) nullable(6)
|
|
static int handle_gc_private_message(const GC_Session *c, const GC_Chat *chat, const GC_Peer *peer, const uint8_t *data,
|
|
uint16_t length, void *userdata)
|
|
{
|
|
if (data == nullptr || length > MAX_GC_MESSAGE_SIZE || length <= 1) {
|
|
return -1;
|
|
}
|
|
|
|
if (peer->ignore || peer->role >= GR_OBSERVER) {
|
|
return 0;
|
|
}
|
|
|
|
const uint8_t message_type = data[0];
|
|
|
|
if (message_type > MESSAGE_ACTION) {
|
|
LOGGER_WARNING(chat->log, "Received invalid private message type: %u", message_type);
|
|
return 0;
|
|
}
|
|
|
|
if (c->private_message != nullptr) {
|
|
c->private_message(c->messenger, chat->group_number, peer->peer_id, message_type, data + 1, length - 1, userdata);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Returns false if a custom packet is too large. */
|
|
static bool custom_gc_packet_length_is_valid(uint16_t length, bool lossless)
|
|
{
|
|
if (lossless) {
|
|
if (length > MAX_GC_CUSTOM_LOSSLESS_PACKET_SIZE) {
|
|
return false;
|
|
}
|
|
} else {
|
|
if (length > MAX_GC_CUSTOM_LOSSY_PACKET_SIZE) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
int gc_send_custom_private_packet(const GC_Chat *chat, bool lossless, uint32_t peer_id, const uint8_t *message,
|
|
uint16_t length)
|
|
{
|
|
if (!custom_gc_packet_length_is_valid(length, lossless)) {
|
|
return -1;
|
|
}
|
|
|
|
if (message == nullptr || length == 0) {
|
|
return -2;
|
|
}
|
|
|
|
const int peer_number = get_peer_number_of_peer_id(chat, peer_id);
|
|
|
|
GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
return -3;
|
|
}
|
|
|
|
if (gc_get_self_role(chat) >= GR_OBSERVER) {
|
|
return -4;
|
|
}
|
|
|
|
bool ret;
|
|
|
|
if (lossless) {
|
|
ret = send_lossless_group_packet(chat, gconn, message, length, GP_CUSTOM_PRIVATE_PACKET);
|
|
} else {
|
|
ret = send_lossy_group_packet(chat, gconn, message, length, GP_CUSTOM_PRIVATE_PACKET);
|
|
}
|
|
|
|
return ret ? 0 : -5;
|
|
}
|
|
|
|
|
|
|
|
/** @brief Handles a custom private packet.
|
|
*
|
|
* @retval 0 if packet is handled correctly.
|
|
* @retval -1 if packet has invalid size.
|
|
*/
|
|
non_null(1, 2, 3, 4) nullable(7)
|
|
static int handle_gc_custom_private_packet(const GC_Session *c, const GC_Chat *chat, const GC_Peer *peer,
|
|
const uint8_t *data, uint16_t length, bool lossless, void *userdata)
|
|
{
|
|
if (!custom_gc_packet_length_is_valid(length, lossless)) {
|
|
return -1;
|
|
}
|
|
|
|
if (data == nullptr || length == 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (peer->ignore || peer->role >= GR_OBSERVER) {
|
|
return 0;
|
|
}
|
|
|
|
if (c->custom_private_packet != nullptr) {
|
|
c->custom_private_packet(c->messenger, chat->group_number, peer->peer_id, data, length, userdata);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gc_send_custom_packet(const GC_Chat *chat, bool lossless, const uint8_t *data, uint16_t length)
|
|
{
|
|
if (!custom_gc_packet_length_is_valid(length, lossless)) {
|
|
return -1;
|
|
}
|
|
|
|
if (data == nullptr || length == 0) {
|
|
return -2;
|
|
}
|
|
|
|
if (gc_get_self_role(chat) >= GR_OBSERVER) {
|
|
return -3;
|
|
}
|
|
|
|
if (lossless) {
|
|
send_gc_lossless_packet_all_peers(chat, data, length, GP_CUSTOM_PACKET);
|
|
} else {
|
|
send_gc_lossy_packet_all_peers(chat, data, length, GP_CUSTOM_PACKET);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Handles a custom packet.
|
|
*
|
|
* Return 0 if packet is handled correctly.
|
|
* Return -1 if packet has invalid size.
|
|
*/
|
|
non_null(1, 2, 3, 4) nullable(7)
|
|
static int handle_gc_custom_packet(const GC_Session *c, const GC_Chat *chat, const GC_Peer *peer, const uint8_t *data,
|
|
uint16_t length, bool lossless, void *userdata)
|
|
{
|
|
if (!custom_gc_packet_length_is_valid(length, lossless)) {
|
|
return -1;
|
|
}
|
|
|
|
if (data == nullptr || length == 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (peer->ignore || peer->role >= GR_OBSERVER) {
|
|
return 0;
|
|
}
|
|
|
|
if (c->custom_packet != nullptr) {
|
|
c->custom_packet(c->messenger, chat->group_number, peer->peer_id, data, length, userdata);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Handles a peer kick broadcast.
|
|
*
|
|
* Return 0 if packet is handled correctly.
|
|
* Return -1 if packet has invalid size.
|
|
*/
|
|
non_null(1, 2, 3, 4) nullable(6)
|
|
static int handle_gc_kick_peer(const GC_Session *c, GC_Chat *chat, const GC_Peer *setter_peer, const uint8_t *data,
|
|
uint16_t length, void *userdata)
|
|
{
|
|
if (length < ENC_PUBLIC_KEY_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
if (setter_peer->role >= GR_USER) {
|
|
return 0;
|
|
}
|
|
|
|
const uint8_t *target_pk = data;
|
|
|
|
const int target_peer_number = get_peer_number_of_enc_pk(chat, target_pk, false);
|
|
GC_Peer *target_peer = get_gc_peer(chat, target_peer_number);
|
|
|
|
if (target_peer != nullptr) {
|
|
if (target_peer->role != GR_USER) {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (peer_number_is_self(target_peer_number)) {
|
|
assert(target_peer != nullptr);
|
|
|
|
for (uint32_t i = 1; i < chat->numpeers; ++i) {
|
|
GC_Connection *gconn = get_gc_connection(chat, i);
|
|
assert(gconn != nullptr);
|
|
|
|
gcc_mark_for_deletion(gconn, chat->tcp_conn, GC_EXIT_TYPE_SELF_DISCONNECTED, nullptr, 0);
|
|
}
|
|
|
|
chat->connection_state = CS_DISCONNECTED;
|
|
|
|
if (c->moderation != nullptr) {
|
|
c->moderation(c->messenger, chat->group_number, setter_peer->peer_id, target_peer->peer_id,
|
|
MV_KICK, userdata);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (target_peer == nullptr) { /** we don't need to/can't kick a peer that isn't in our peerlist */
|
|
return 0;
|
|
}
|
|
|
|
gcc_mark_for_deletion(&target_peer->gconn, chat->tcp_conn, GC_EXIT_TYPE_KICKED, nullptr, 0);
|
|
|
|
if (c->moderation != nullptr) {
|
|
c->moderation(c->messenger, chat->group_number, setter_peer->peer_id, target_peer->peer_id, MV_KICK, userdata);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Sends a packet to instruct all peers to remove gconn from their peerlist.
|
|
*
|
|
* Returns true on success.
|
|
*/
|
|
non_null()
|
|
static bool send_gc_kick_peer(const GC_Chat *chat, const GC_Connection *gconn)
|
|
{
|
|
uint8_t packet[ENC_PUBLIC_KEY_SIZE];
|
|
memcpy(packet, gconn->addr.public_key, ENC_PUBLIC_KEY_SIZE);
|
|
|
|
return send_gc_broadcast_message(chat, packet, ENC_PUBLIC_KEY_SIZE, GM_KICK_PEER);
|
|
}
|
|
|
|
int gc_kick_peer(const Messenger *m, int group_number, uint32_t peer_id)
|
|
{
|
|
const GC_Session *c = m->group_handler;
|
|
GC_Chat *chat = gc_get_group(c, group_number);
|
|
|
|
if (chat == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
const int peer_number = get_peer_number_of_peer_id(chat, peer_id);
|
|
|
|
if (peer_number_is_self(peer_number)) {
|
|
return -6;
|
|
}
|
|
|
|
GC_Peer *peer = get_gc_peer(chat, peer_number);
|
|
|
|
if (peer == nullptr) {
|
|
return -2;
|
|
}
|
|
|
|
if (gc_get_self_role(chat) >= GR_USER || peer->role == GR_FOUNDER) {
|
|
return -3;
|
|
}
|
|
|
|
if (!self_gc_is_founder(chat) && peer->role == GR_MODERATOR) {
|
|
return -3;
|
|
}
|
|
|
|
if (peer->role == GR_MODERATOR || peer->role == GR_OBSERVER) {
|
|
// this first removes peer from any lists they're on and broadcasts new lists to group
|
|
if (gc_set_peer_role(c->messenger, chat->group_number, peer_id, GR_USER) < 0) {
|
|
return -4;
|
|
}
|
|
}
|
|
|
|
if (!send_gc_kick_peer(chat, &peer->gconn)) {
|
|
return -5;
|
|
}
|
|
|
|
gcc_mark_for_deletion(&peer->gconn, chat->tcp_conn, GC_EXIT_TYPE_NO_CALLBACK, nullptr, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool gc_send_message_ack(const GC_Chat *chat, GC_Connection *gconn, uint64_t message_id, Group_Message_Ack_Type type)
|
|
{
|
|
if (gconn->pending_delete) {
|
|
return true;
|
|
}
|
|
|
|
if (type == GR_ACK_REQ) {
|
|
const uint64_t tm = mono_time_get(chat->mono_time);
|
|
|
|
if (gconn->last_requested_packet_time == tm) {
|
|
return true;
|
|
}
|
|
|
|
gconn->last_requested_packet_time = tm;
|
|
} else if (type != GR_ACK_RECV) {
|
|
return false;
|
|
}
|
|
|
|
uint8_t data[GC_LOSSLESS_ACK_PACKET_SIZE];
|
|
data[0] = (uint8_t) type;
|
|
net_pack_u64(data + 1, message_id);
|
|
|
|
return send_lossy_group_packet(chat, gconn, data, GC_LOSSLESS_ACK_PACKET_SIZE, GP_MESSAGE_ACK);
|
|
}
|
|
|
|
/** @brief Handles a lossless message acknowledgement.
|
|
*
|
|
* If the type is GR_ACK_RECV we remove the packet from our
|
|
* send array. If the type is GR_ACK_REQ we re-send the packet
|
|
* associated with the requested message_id.
|
|
*
|
|
* Returns 0 if packet is handled correctly.
|
|
* Return -1 if packet has invalid size.
|
|
* Return -2 if we failed to handle the ack (may be caused by connection issues).
|
|
* Return -3 if we failed to re-send a requested packet.
|
|
*/
|
|
non_null()
|
|
static int handle_gc_message_ack(const GC_Chat *chat, GC_Connection *gconn, const uint8_t *data, uint16_t length)
|
|
{
|
|
if (length < GC_LOSSLESS_ACK_PACKET_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
uint64_t message_id;
|
|
net_unpack_u64(data + 1, &message_id);
|
|
|
|
const Group_Message_Ack_Type type = (Group_Message_Ack_Type) data[0];
|
|
|
|
if (type == GR_ACK_RECV) {
|
|
if (!gcc_handle_ack(chat->log, gconn, message_id)) {
|
|
return -2;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (type != GR_ACK_REQ) {
|
|
return 0;
|
|
}
|
|
|
|
const uint64_t tm = mono_time_get(chat->mono_time);
|
|
const uint16_t idx = gcc_get_array_index(message_id);
|
|
|
|
/* re-send requested packet */
|
|
if (gconn->send_array[idx].message_id == message_id) {
|
|
if (gcc_encrypt_and_send_lossless_packet(chat, gconn, gconn->send_array[idx].data,
|
|
gconn->send_array[idx].data_length,
|
|
gconn->send_array[idx].message_id,
|
|
gconn->send_array[idx].packet_type)) {
|
|
gconn->send_array[idx].last_send_try = tm;
|
|
LOGGER_DEBUG(chat->log, "Re-sent requested packet %llu", (unsigned long long)message_id);
|
|
} else {
|
|
return -3;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Sends a handshake response ack to peer.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null()
|
|
static bool send_gc_hs_response_ack(const GC_Chat *chat, GC_Connection *gconn)
|
|
{
|
|
return send_lossless_group_packet(chat, gconn, nullptr, 0, GP_HS_RESPONSE_ACK);
|
|
}
|
|
|
|
/** @brief Handles a handshake response ack.
|
|
*
|
|
* Return 0 if packet is handled correctly.
|
|
* Return -1 if we failed to respond with an invite request.
|
|
*/
|
|
non_null()
|
|
static int handle_gc_hs_response_ack(const GC_Chat *chat, GC_Connection *gconn)
|
|
{
|
|
gconn->handshaked = true; // has to be true before we can send a lossless packet
|
|
|
|
if (!send_gc_invite_request(chat, gconn)) {
|
|
gconn->handshaked = false;
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gc_set_ignore(const GC_Chat *chat, uint32_t peer_id, bool ignore)
|
|
{
|
|
const int peer_number = get_peer_number_of_peer_id(chat, peer_id);
|
|
|
|
GC_Peer *peer = get_gc_peer(chat, peer_number);
|
|
|
|
if (peer == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
if (peer_number_is_self(peer_number)) {
|
|
return -2;
|
|
}
|
|
|
|
peer->ignore = ignore;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Handles a broadcast packet.
|
|
*
|
|
* Returns 0 if packet is handled correctly.
|
|
* Returns -1 on failure.
|
|
*/
|
|
non_null(1, 2, 4) nullable(6)
|
|
static int handle_gc_broadcast(const GC_Session *c, GC_Chat *chat, uint32_t peer_number, const uint8_t *data,
|
|
uint16_t length, void *userdata)
|
|
{
|
|
if (length < GC_BROADCAST_ENC_HEADER_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
GC_Peer *peer = get_gc_peer(chat, peer_number);
|
|
|
|
if (peer == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
GC_Connection *gconn = &peer->gconn;
|
|
|
|
if (!gconn->confirmed) {
|
|
return -1;
|
|
}
|
|
|
|
const uint8_t broadcast_type = data[0];
|
|
|
|
const uint16_t m_len = length - 1;
|
|
const uint8_t *message = data + 1;
|
|
|
|
int ret = 0;
|
|
|
|
switch (broadcast_type) {
|
|
case GM_STATUS: {
|
|
ret = handle_gc_status(c, chat, peer, message, m_len, userdata);
|
|
break;
|
|
}
|
|
|
|
case GM_NICK: {
|
|
ret = handle_gc_nick(c, chat, peer, message, m_len, userdata);
|
|
break;
|
|
}
|
|
|
|
case GM_ACTION_MESSAGE:
|
|
|
|
// intentional fallthrough
|
|
case GM_PLAIN_MESSAGE: {
|
|
ret = handle_gc_message(c, chat, peer, message, m_len, broadcast_type, userdata);
|
|
break;
|
|
}
|
|
|
|
case GM_PRIVATE_MESSAGE: {
|
|
ret = handle_gc_private_message(c, chat, peer, message, m_len, userdata);
|
|
break;
|
|
}
|
|
|
|
case GM_PEER_EXIT: {
|
|
handle_gc_peer_exit(chat, gconn, message, m_len);
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
case GM_KICK_PEER: {
|
|
ret = handle_gc_kick_peer(c, chat, peer, message, m_len, userdata);
|
|
break;
|
|
}
|
|
|
|
case GM_SET_MOD: {
|
|
ret = handle_gc_set_mod(c, chat, peer_number, message, m_len, userdata);
|
|
break;
|
|
}
|
|
|
|
case GM_SET_OBSERVER: {
|
|
ret = handle_gc_set_observer(c, chat, peer_number, message, m_len, userdata);
|
|
break;
|
|
}
|
|
|
|
default: {
|
|
LOGGER_DEBUG(chat->log, "Received an invalid broadcast type 0x%02x", broadcast_type);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (ret < 0) {
|
|
LOGGER_DEBUG(chat->log, "Broadcast handle error %d: type: 0x%02x, peernumber: %u",
|
|
ret, broadcast_type, peer_number);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Decrypts data of size `length` using self secret key and sender's public key.
|
|
*
|
|
* The packet payload should begin with a nonce.
|
|
*
|
|
* Returns length of plaintext data on success.
|
|
* Return -1 if length is invalid.
|
|
* Return -2 if decryption fails.
|
|
*/
|
|
non_null()
|
|
static int unwrap_group_handshake_packet(const Logger *log, const uint8_t *self_sk, const uint8_t *sender_pk,
|
|
uint8_t *plain, size_t plain_size, const uint8_t *packet, uint16_t length)
|
|
{
|
|
if (length <= CRYPTO_NONCE_SIZE) {
|
|
LOGGER_FATAL(log, "Invalid handshake packet length %u", length);
|
|
return -1;
|
|
}
|
|
|
|
const int plain_len = decrypt_data(sender_pk, self_sk, packet, packet + CRYPTO_NONCE_SIZE,
|
|
length - CRYPTO_NONCE_SIZE, plain);
|
|
|
|
if (plain_len < 0 || (uint32_t)plain_len != plain_size) {
|
|
LOGGER_DEBUG(log, "decrypt handshake request failed: len: %d, size: %zu", plain_len, plain_size);
|
|
return -2;
|
|
}
|
|
|
|
return plain_len;
|
|
}
|
|
|
|
/** @brief Encrypts data of length using the peer's shared key a new nonce.
|
|
*
|
|
* Adds plaintext header consisting of: packet identifier, target public encryption key,
|
|
* self public encryption key, nonce.
|
|
*
|
|
* Return length of encrypted packet on success.
|
|
* Return -1 if packet size is invalid.
|
|
* Return -2 on malloc failure.
|
|
* Return -3 if encryption fails.
|
|
*/
|
|
non_null()
|
|
static int wrap_group_handshake_packet(
|
|
const Logger *log, const Random *rng, const uint8_t *self_pk, const uint8_t *self_sk,
|
|
const uint8_t *target_pk, uint8_t *packet, uint32_t packet_size,
|
|
const uint8_t *data, uint16_t length)
|
|
{
|
|
if (packet_size != GC_MIN_ENCRYPTED_HS_PAYLOAD_SIZE + sizeof(Node_format)) {
|
|
LOGGER_FATAL(log, "Invalid packet size: %u", packet_size);
|
|
return -1;
|
|
}
|
|
|
|
uint8_t nonce[CRYPTO_NONCE_SIZE];
|
|
random_nonce(rng, nonce);
|
|
|
|
const size_t encrypt_buf_size = length + CRYPTO_MAC_SIZE;
|
|
uint8_t *encrypt = (uint8_t *)malloc(encrypt_buf_size);
|
|
|
|
if (encrypt == nullptr) {
|
|
return -2;
|
|
}
|
|
|
|
const int enc_len = encrypt_data(target_pk, self_sk, nonce, data, length, encrypt);
|
|
|
|
if (enc_len < 0 || (size_t)enc_len != encrypt_buf_size) {
|
|
LOGGER_ERROR(log, "Failed to encrypt group handshake packet (len: %d)", enc_len);
|
|
free(encrypt);
|
|
return -3;
|
|
}
|
|
|
|
packet[0] = NET_PACKET_GC_HANDSHAKE;
|
|
memcpy(packet + 1, self_pk, ENC_PUBLIC_KEY_SIZE);
|
|
memcpy(packet + 1 + ENC_PUBLIC_KEY_SIZE, target_pk, ENC_PUBLIC_KEY_SIZE);
|
|
memcpy(packet + 1 + ENC_PUBLIC_KEY_SIZE + ENC_PUBLIC_KEY_SIZE, nonce, CRYPTO_NONCE_SIZE);
|
|
memcpy(packet + 1 + ENC_PUBLIC_KEY_SIZE + ENC_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE, encrypt, enc_len);
|
|
|
|
free(encrypt);
|
|
|
|
return 1 + ENC_PUBLIC_KEY_SIZE + ENC_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE + enc_len;
|
|
}
|
|
|
|
/** @brief Makes, wraps and encrypts a group handshake packet (both request and response are the same format).
|
|
*
|
|
* Packet contains the packet header, handshake type, self public encryption key, self public signature key,
|
|
* request type, and a single TCP relay node.
|
|
*
|
|
* Returns length of encrypted packet on success.
|
|
* Returns -1 on failure.
|
|
*/
|
|
non_null()
|
|
static int make_gc_handshake_packet(const GC_Chat *chat, const GC_Connection *gconn, uint8_t handshake_type,
|
|
uint8_t request_type, uint8_t join_type, uint8_t *packet, size_t packet_size,
|
|
const Node_format *node)
|
|
{
|
|
if (packet_size != GC_MIN_ENCRYPTED_HS_PAYLOAD_SIZE + sizeof(Node_format)) {
|
|
LOGGER_FATAL(chat->log, "invalid packet size: %zu", packet_size);
|
|
return -1;
|
|
}
|
|
|
|
if (chat == nullptr || gconn == nullptr || node == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
uint8_t data[GC_MIN_HS_PACKET_PAYLOAD_SIZE + sizeof(Node_format)];
|
|
|
|
uint16_t length = sizeof(uint8_t);
|
|
|
|
data[0] = handshake_type;
|
|
memcpy(data + length, gconn->session_public_key, ENC_PUBLIC_KEY_SIZE);
|
|
length += ENC_PUBLIC_KEY_SIZE;
|
|
memcpy(data + length, get_sig_pk(chat->self_public_key), SIG_PUBLIC_KEY_SIZE);
|
|
length += SIG_PUBLIC_KEY_SIZE;
|
|
memcpy(data + length, &request_type, sizeof(uint8_t));
|
|
length += sizeof(uint8_t);
|
|
memcpy(data + length, &join_type, sizeof(uint8_t));
|
|
length += sizeof(uint8_t);
|
|
|
|
int nodes_size = pack_nodes(chat->log, data + length, sizeof(Node_format), node, MAX_SENT_GC_NODES);
|
|
|
|
if (nodes_size > 0) {
|
|
length += nodes_size;
|
|
} else {
|
|
nodes_size = 0;
|
|
}
|
|
|
|
const int enc_len = wrap_group_handshake_packet(
|
|
chat->log, chat->rng, chat->self_public_key, chat->self_secret_key,
|
|
gconn->addr.public_key, packet, (uint16_t)packet_size, data, length);
|
|
|
|
if (enc_len != GC_MIN_ENCRYPTED_HS_PAYLOAD_SIZE + nodes_size) {
|
|
LOGGER_WARNING(chat->log, "Failed to wrap handshake packet: %d", enc_len);
|
|
return -1;
|
|
}
|
|
|
|
return enc_len;
|
|
}
|
|
|
|
/** @brief Sends a handshake packet to `gconn`.
|
|
*
|
|
* Handshake_type should be GH_REQUEST or GH_RESPONSE.
|
|
*
|
|
* Returns true on success.
|
|
*/
|
|
non_null()
|
|
static bool send_gc_handshake_packet(const GC_Chat *chat, GC_Connection *gconn, uint8_t handshake_type,
|
|
uint8_t request_type, uint8_t join_type)
|
|
{
|
|
if (gconn == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
Node_format node;
|
|
memset(&node, 0, sizeof(node));
|
|
|
|
if (!gcc_copy_tcp_relay(chat->rng, &node, gconn)) {
|
|
LOGGER_TRACE(chat->log, "Failed to copy TCP relay during handshake (%u TCP relays)", gconn->tcp_relays_count);
|
|
}
|
|
|
|
uint8_t packet[GC_MIN_ENCRYPTED_HS_PAYLOAD_SIZE + sizeof(Node_format)];
|
|
const int length = make_gc_handshake_packet(chat, gconn, handshake_type, request_type, join_type, packet,
|
|
sizeof(packet), &node);
|
|
|
|
if (length < 0) {
|
|
return false;
|
|
}
|
|
|
|
const bool try_tcp_fallback = gconn->handshake_attempts % 2 == 1 && gconn->tcp_relays_count > 0;
|
|
++gconn->handshake_attempts;
|
|
|
|
int ret = -1;
|
|
|
|
if (!try_tcp_fallback && gcc_direct_conn_is_possible(chat, gconn)) {
|
|
ret = sendpacket(chat->net, &gconn->addr.ip_port, packet, (uint16_t)length);
|
|
}
|
|
|
|
if (ret != length && gconn->tcp_relays_count == 0) {
|
|
LOGGER_WARNING(chat->log, "UDP handshake failed and no TCP relays to fall back on");
|
|
return false;
|
|
}
|
|
|
|
// Send a TCP handshake if UDP fails, or if UDP succeeded last time but we never got a response
|
|
if (gconn->tcp_relays_count > 0 && (ret != length || try_tcp_fallback)) {
|
|
if (send_packet_tcp_connection(chat->tcp_conn, gconn->tcp_connection_num, packet, (uint16_t)length) == -1) {
|
|
LOGGER_DEBUG(chat->log, "Send handshake packet failed. Type 0x%02x", request_type);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (gconn->is_pending_handshake_response) {
|
|
gcc_set_send_message_id(gconn, 3); // handshake response is always second packet
|
|
} else {
|
|
gcc_set_send_message_id(gconn, 2); // handshake request is always first packet
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Sends an out-of-band TCP handshake request packet to `gconn`.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
static bool send_gc_oob_handshake_request(const GC_Chat *chat, const GC_Connection *gconn)
|
|
{
|
|
if (gconn == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
Node_format node;
|
|
memset(&node, 0, sizeof(node));
|
|
|
|
if (!gcc_copy_tcp_relay(chat->rng, &node, gconn)) {
|
|
LOGGER_WARNING(chat->log, "Failed to copy TCP relay");
|
|
return false;
|
|
}
|
|
|
|
uint8_t packet[GC_MIN_ENCRYPTED_HS_PAYLOAD_SIZE + sizeof(Node_format)];
|
|
const int length = make_gc_handshake_packet(chat, gconn, GH_REQUEST, gconn->pending_handshake_type, chat->join_type,
|
|
packet, sizeof(packet), &node);
|
|
|
|
if (length < 0) {
|
|
LOGGER_WARNING(chat->log, "Failed to make handshake packet");
|
|
return false;
|
|
}
|
|
|
|
return tcp_send_oob_packet_using_relay(chat->tcp_conn, gconn->oob_relay_pk, gconn->addr.public_key,
|
|
packet, (uint16_t)length) == 0;
|
|
}
|
|
|
|
/** @brief Handles a handshake response packet and takes appropriate action depending on the value of request_type.
|
|
*
|
|
* This function assumes the length has already been validated.
|
|
*
|
|
* Returns peer_number of new connected peer on success.
|
|
* Returns -1 on failure.
|
|
*/
|
|
non_null()
|
|
static int handle_gc_handshake_response(const GC_Chat *chat, const uint8_t *sender_pk, const uint8_t *data,
|
|
uint16_t length)
|
|
{
|
|
// this should be checked at lower level; this is a redundant defense check. Ideally we should
|
|
// guarantee that this can never happen in the future.
|
|
if (length < ENC_PUBLIC_KEY_SIZE + SIG_PUBLIC_KEY_SIZE + 1) {
|
|
LOGGER_FATAL(chat->log, "Invalid handshake response size (%u)", length);
|
|
return -1;
|
|
}
|
|
|
|
const int peer_number = get_peer_number_of_enc_pk(chat, sender_pk, false);
|
|
|
|
if (peer_number == -1) {
|
|
return -1;
|
|
}
|
|
|
|
GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
const uint8_t *sender_session_pk = data;
|
|
|
|
gcc_make_session_shared_key(gconn, sender_session_pk);
|
|
|
|
set_sig_pk(gconn->addr.public_key, data + ENC_PUBLIC_KEY_SIZE);
|
|
|
|
gcc_set_recv_message_id(gconn, 2); // handshake response is always second packet
|
|
|
|
gconn->handshaked = true;
|
|
|
|
send_gc_hs_response_ack(chat, gconn);
|
|
|
|
const uint8_t request_type = data[ENC_PUBLIC_KEY_SIZE + SIG_PUBLIC_KEY_SIZE];
|
|
|
|
switch (request_type) {
|
|
case HS_INVITE_REQUEST: {
|
|
if (!send_gc_invite_request(chat, gconn)) {
|
|
return -1;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case HS_PEER_INFO_EXCHANGE: {
|
|
if (!send_gc_peer_exchange(chat, gconn)) {
|
|
return -1;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
default: {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return peer_number;
|
|
}
|
|
|
|
/** @brief Sends a handshake response packet of type `request_type` to `gconn`.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null()
|
|
static bool send_gc_handshake_response(const GC_Chat *chat, GC_Connection *gconn)
|
|
{
|
|
return send_gc_handshake_packet(chat, gconn, GH_RESPONSE, gconn->pending_handshake_type, 0);
|
|
}
|
|
|
|
/** @brief Handles handshake request packets.
|
|
*
|
|
* Peer is added to peerlist and a lossless connection is established.
|
|
*
|
|
* This function assumes the length has already been validated.
|
|
*
|
|
* Return new peer's peer_number on success.
|
|
* Return -1 on failure.
|
|
*/
|
|
#define GC_NEW_PEER_CONNECTION_LIMIT 10
|
|
non_null(1, 3, 4) nullable(2)
|
|
static int handle_gc_handshake_request(GC_Chat *chat, const IP_Port *ipp, const uint8_t *sender_pk,
|
|
const uint8_t *data, uint16_t length)
|
|
{
|
|
// this should be checked at lower level; this is a redundant defense check. Ideally we should
|
|
// guarantee that this can never happen in the future.
|
|
if (length < ENC_PUBLIC_KEY_SIZE + SIG_PUBLIC_KEY_SIZE + 1 + 1) {
|
|
LOGGER_FATAL(chat->log, "Invalid length (%u)", length);
|
|
return -1;
|
|
}
|
|
|
|
if (chat->connection_state <= CS_DISCONNECTED) {
|
|
LOGGER_DEBUG(chat->log, "Handshake request ignored; state is disconnected");
|
|
return -1;
|
|
}
|
|
|
|
if (chat->connection_o_metre >= GC_NEW_PEER_CONNECTION_LIMIT) {
|
|
chat->block_handshakes = true;
|
|
LOGGER_DEBUG(chat->log, "Handshake overflow. Blocking handshakes.");
|
|
return -1;
|
|
}
|
|
|
|
++chat->connection_o_metre;
|
|
|
|
const uint8_t *public_sig_key = data + ENC_PUBLIC_KEY_SIZE;
|
|
|
|
const uint8_t request_type = data[ENC_PUBLIC_KEY_SIZE + SIG_PUBLIC_KEY_SIZE];
|
|
const uint8_t join_type = data[ENC_PUBLIC_KEY_SIZE + SIG_PUBLIC_KEY_SIZE + 1];
|
|
|
|
int peer_number = get_peer_number_of_enc_pk(chat, sender_pk, false);
|
|
const bool is_new_peer = peer_number < 0;
|
|
|
|
if (is_new_peer) {
|
|
peer_number = peer_add(chat, ipp, sender_pk);
|
|
|
|
if (peer_number < 0) {
|
|
LOGGER_WARNING(chat->log, "Failed to add peer during handshake request");
|
|
return -1;
|
|
}
|
|
} else {
|
|
GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
LOGGER_WARNING(chat->log, "Invalid peer number");
|
|
return -1;
|
|
}
|
|
|
|
if (gconn->handshaked) {
|
|
gconn->handshaked = false;
|
|
LOGGER_DEBUG(chat->log, "Handshaked peer sent a handshake request");
|
|
return -1;
|
|
}
|
|
|
|
// peers sent handshake request at same time so the closer peer becomes the requestor
|
|
// and ignores the request packet while further peer continues on with the response
|
|
if (gconn->self_is_closer) {
|
|
LOGGER_DEBUG(chat->log, "Simultaneous handshake requests; other peer is closer");
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
LOGGER_DEBUG(chat->log, "Peer connection invalid");
|
|
return -1;
|
|
}
|
|
|
|
gcc_set_ip_port(gconn, ipp);
|
|
|
|
Node_format node[GCA_MAX_ANNOUNCED_TCP_RELAYS];
|
|
const int processed = ENC_PUBLIC_KEY_SIZE + SIG_PUBLIC_KEY_SIZE + 1 + 1;
|
|
|
|
const int nodes_count = unpack_nodes(node, GCA_MAX_ANNOUNCED_TCP_RELAYS, nullptr,
|
|
data + processed, length - processed, true);
|
|
|
|
if (nodes_count <= 0 && ipp == nullptr) {
|
|
if (is_new_peer) {
|
|
LOGGER_WARNING(chat->log, "Broken tcp relay for new peer");
|
|
gcc_mark_for_deletion(gconn, chat->tcp_conn, GC_EXIT_TYPE_DISCONNECTED, nullptr, 0);
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
if (nodes_count > 0) {
|
|
const int add_tcp_result = add_tcp_relay_connection(chat->tcp_conn, gconn->tcp_connection_num,
|
|
&node->ip_port, node->public_key);
|
|
|
|
if (add_tcp_result < 0 && is_new_peer && ipp == nullptr) {
|
|
LOGGER_WARNING(chat->log, "Broken tcp relay for new peer");
|
|
gcc_mark_for_deletion(gconn, chat->tcp_conn, GC_EXIT_TYPE_DISCONNECTED, nullptr, 0);
|
|
return -1;
|
|
}
|
|
|
|
if (add_tcp_result == 0) {
|
|
gcc_save_tcp_relay(chat->rng, gconn, node);
|
|
}
|
|
}
|
|
|
|
const uint8_t *sender_session_pk = data;
|
|
|
|
gcc_make_session_shared_key(gconn, sender_session_pk);
|
|
|
|
set_sig_pk(gconn->addr.public_key, public_sig_key);
|
|
|
|
if (join_type == HJ_PUBLIC && !is_public_chat(chat)) {
|
|
gcc_mark_for_deletion(gconn, chat->tcp_conn, GC_EXIT_TYPE_DISCONNECTED, nullptr, 0);
|
|
LOGGER_DEBUG(chat->log, "Ignoring invalid invite request");
|
|
return -1;
|
|
}
|
|
|
|
gcc_set_recv_message_id(gconn, 1); // handshake request is always first packet
|
|
|
|
gconn->is_pending_handshake_response = true;
|
|
gconn->pending_handshake_type = request_type;
|
|
|
|
return peer_number;
|
|
}
|
|
|
|
/** @brief Handles handshake request and handshake response packets.
|
|
*
|
|
* Returns the peer_number of the connecting peer on success.
|
|
* Returns -1 on failure.
|
|
*/
|
|
non_null(1, 2, 4) nullable(3, 7)
|
|
static int handle_gc_handshake_packet(GC_Chat *chat, const uint8_t *sender_pk, const IP_Port *ipp,
|
|
const uint8_t *packet, uint16_t length, bool direct_conn, void *userdata)
|
|
{
|
|
if (length < GC_MIN_HS_PACKET_PAYLOAD_SIZE + CRYPTO_MAC_SIZE + CRYPTO_NONCE_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
const size_t data_buf_size = length - CRYPTO_NONCE_SIZE - CRYPTO_MAC_SIZE;
|
|
uint8_t *data = (uint8_t *)malloc(data_buf_size);
|
|
|
|
if (data == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
const int plain_len = unwrap_group_handshake_packet(chat->log, chat->self_secret_key, sender_pk, data,
|
|
data_buf_size, packet, length);
|
|
|
|
if (plain_len < GC_MIN_HS_PACKET_PAYLOAD_SIZE) {
|
|
LOGGER_DEBUG(chat->log, "Failed to unwrap handshake packet (probably a stale request using an old key)");
|
|
free(data);
|
|
return -1;
|
|
}
|
|
|
|
const uint8_t handshake_type = data[0];
|
|
|
|
const uint8_t *real_data = data + 1;
|
|
const uint16_t real_len = (uint16_t)plain_len - 1;
|
|
|
|
int peer_number;
|
|
|
|
if (handshake_type == GH_REQUEST) {
|
|
peer_number = handle_gc_handshake_request(chat, ipp, sender_pk, real_data, real_len);
|
|
} else if (handshake_type == GH_RESPONSE) {
|
|
peer_number = handle_gc_handshake_response(chat, sender_pk, real_data, real_len);
|
|
} else {
|
|
free(data);
|
|
return -1;
|
|
}
|
|
|
|
free(data);
|
|
|
|
GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
if (direct_conn) {
|
|
gconn->last_received_direct_time = mono_time_get(chat->mono_time);
|
|
}
|
|
|
|
return peer_number;
|
|
}
|
|
|
|
bool handle_gc_lossless_helper(const GC_Session *c, GC_Chat *chat, uint32_t peer_number, const uint8_t *data,
|
|
uint16_t length, uint8_t packet_type, void *userdata)
|
|
{
|
|
GC_Peer *peer = get_gc_peer(chat, peer_number);
|
|
|
|
if (peer == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
GC_Connection *gconn = &peer->gconn;
|
|
|
|
int ret;
|
|
|
|
switch (packet_type) {
|
|
case GP_BROADCAST: {
|
|
ret = handle_gc_broadcast(c, chat, peer_number, data, length, userdata);
|
|
break;
|
|
}
|
|
|
|
case GP_PEER_INFO_REQUEST: {
|
|
ret = handle_gc_peer_info_request(chat, peer_number);
|
|
break;
|
|
}
|
|
|
|
case GP_PEER_INFO_RESPONSE: {
|
|
ret = handle_gc_peer_info_response(c, chat, peer_number, data, length, userdata);
|
|
break;
|
|
}
|
|
|
|
case GP_SYNC_REQUEST: {
|
|
ret = handle_gc_sync_request(chat, peer_number, data, length);
|
|
break;
|
|
}
|
|
|
|
case GP_SYNC_RESPONSE: {
|
|
ret = handle_gc_sync_response(c, chat, peer_number, data, length, userdata);
|
|
break;
|
|
}
|
|
|
|
case GP_INVITE_REQUEST: {
|
|
ret = handle_gc_invite_request(chat, peer_number, data, length);
|
|
break;
|
|
}
|
|
|
|
case GP_INVITE_RESPONSE: {
|
|
ret = handle_gc_invite_response(chat, gconn);
|
|
break;
|
|
}
|
|
|
|
case GP_TOPIC: {
|
|
ret = handle_gc_topic(c, chat, peer, data, length, userdata);
|
|
break;
|
|
}
|
|
|
|
case GP_SHARED_STATE: {
|
|
ret = handle_gc_shared_state(c, chat, gconn, data, length, userdata);
|
|
break;
|
|
}
|
|
|
|
case GP_MOD_LIST: {
|
|
ret = handle_gc_mod_list(c, chat, data, length, userdata);
|
|
break;
|
|
}
|
|
|
|
case GP_SANCTIONS_LIST: {
|
|
ret = handle_gc_sanctions_list(c, chat, data, length, userdata);
|
|
break;
|
|
}
|
|
|
|
case GP_HS_RESPONSE_ACK: {
|
|
ret = handle_gc_hs_response_ack(chat, gconn);
|
|
break;
|
|
}
|
|
|
|
case GP_TCP_RELAYS: {
|
|
ret = handle_gc_tcp_relays(chat, gconn, data, length);
|
|
break;
|
|
}
|
|
|
|
case GP_KEY_ROTATION: {
|
|
ret = handle_gc_key_exchange(chat, gconn, data, length);
|
|
break;
|
|
}
|
|
|
|
case GP_CUSTOM_PACKET: {
|
|
ret = handle_gc_custom_packet(c, chat, peer, data, length, true, userdata);
|
|
break;
|
|
}
|
|
|
|
case GP_CUSTOM_PRIVATE_PACKET: {
|
|
ret = handle_gc_custom_private_packet(c, chat, peer, data, length, true, userdata);
|
|
break;
|
|
}
|
|
|
|
default: {
|
|
LOGGER_DEBUG(chat->log, "Handling invalid lossless group packet type 0x%02x", packet_type);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (ret < 0) {
|
|
LOGGER_DEBUG(chat->log, "Lossless packet handle error %d: type: 0x%02x, peernumber: %d",
|
|
ret, packet_type, peer_number);
|
|
return false;
|
|
}
|
|
|
|
peer = get_gc_peer(chat, peer_number);
|
|
|
|
if (peer != nullptr) {
|
|
peer->gconn.last_requested_packet_time = mono_time_get(chat->mono_time);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Handles a packet fragment.
|
|
*
|
|
* If the fragment is the last one in a sequence we send an ack. Otherwise we
|
|
* store the fragment in the receive array and wait for the next segment.
|
|
*
|
|
* Segments must be processed in correct sequence, and we cannot handle
|
|
* non-fragment packets while a sequence is incomplete.
|
|
*
|
|
* Return true if packet is handled successfully.
|
|
*/
|
|
non_null(1, 2, 4) nullable(5, 9)
|
|
static bool handle_gc_packet_fragment(const GC_Session *c, GC_Chat *chat, uint32_t peer_number, GC_Connection *gconn,
|
|
const uint8_t *data, uint16_t length, uint8_t packet_type, uint64_t message_id,
|
|
void *userdata)
|
|
{
|
|
if (gconn->last_chunk_id != 0 && message_id != gconn->last_chunk_id + 1) {
|
|
return gc_send_message_ack(chat, gconn, gconn->last_chunk_id + 1, GR_ACK_REQ);
|
|
}
|
|
|
|
if (gconn->last_chunk_id == 0 && message_id != gconn->received_message_id + 1) {
|
|
return gc_send_message_ack(chat, gconn, gconn->received_message_id + 1, GR_ACK_REQ);
|
|
}
|
|
|
|
const int frag_ret = gcc_handle_packet_fragment(c, chat, peer_number, gconn, data, length, packet_type,
|
|
message_id, userdata);
|
|
|
|
if (frag_ret == -1) {
|
|
return false;
|
|
}
|
|
|
|
if (frag_ret == 0) {
|
|
gc_send_message_ack(chat, gconn, message_id, GR_ACK_RECV);
|
|
}
|
|
|
|
gconn->last_received_packet_time = mono_time_get(chat->mono_time);
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Handles lossless groupchat packets.
|
|
*
|
|
* This function assumes the length has already been validated.
|
|
*
|
|
* Returns true if packet is successfully handled.
|
|
*/
|
|
non_null(1, 2, 3, 4) nullable(7)
|
|
static bool handle_gc_lossless_packet(const GC_Session *c, GC_Chat *chat, const uint8_t *sender_pk,
|
|
const uint8_t *packet, uint16_t length, bool direct_conn, void *userdata)
|
|
{
|
|
if (length < GC_MIN_LOSSLESS_PAYLOAD_SIZE) {
|
|
return false;
|
|
}
|
|
|
|
int peer_number = get_peer_number_of_enc_pk(chat, sender_pk, false);
|
|
|
|
GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
if (gconn->pending_delete) {
|
|
return true;
|
|
}
|
|
|
|
uint8_t *data = (uint8_t *)malloc(length);
|
|
|
|
if (data == nullptr) {
|
|
LOGGER_DEBUG(chat->log, "Failed to allocate memory for packet data buffer");
|
|
return false;
|
|
}
|
|
|
|
uint8_t packet_type;
|
|
uint64_t message_id;
|
|
|
|
const int len = group_packet_unwrap(chat->log, gconn, data, &message_id, &packet_type, packet, length);
|
|
|
|
if (len < 0) {
|
|
Ip_Ntoa ip_str;
|
|
LOGGER_DEBUG(chat->log, "Failed to unwrap lossless packet from %s:%d: %d",
|
|
net_ip_ntoa(&gconn->addr.ip_port.ip, &ip_str), net_ntohs(gconn->addr.ip_port.port), len);
|
|
free(data);
|
|
return false;
|
|
}
|
|
|
|
if (!gconn->handshaked && (packet_type != GP_HS_RESPONSE_ACK && packet_type != GP_INVITE_REQUEST)) {
|
|
LOGGER_DEBUG(chat->log, "Got lossless packet type 0x%02x from unconfirmed peer", packet_type);
|
|
free(data);
|
|
return false;
|
|
}
|
|
|
|
const bool is_invite_packet = packet_type == GP_INVITE_REQUEST || packet_type == GP_INVITE_RESPONSE
|
|
|| packet_type == GP_INVITE_RESPONSE_REJECT;
|
|
|
|
if (message_id == 3 && is_invite_packet && gconn->received_message_id <= 1) {
|
|
// we missed initial handshake request. Drop this packet and wait for another handshake request.
|
|
LOGGER_DEBUG(chat->log, "Missed handshake packet, type: 0x%02x", packet_type);
|
|
free(data);
|
|
return false;
|
|
}
|
|
|
|
const int lossless_ret = gcc_handle_received_message(chat->log, chat->mono_time, gconn, data, (uint16_t) len,
|
|
packet_type, message_id, direct_conn);
|
|
|
|
if (packet_type == GP_INVITE_REQUEST && !gconn->handshaked) { // Both peers sent request at same time
|
|
free(data);
|
|
return true;
|
|
}
|
|
|
|
if (lossless_ret < 0) {
|
|
LOGGER_DEBUG(chat->log, "failed to handle packet %llu (type: 0x%02x, id: %llu)",
|
|
(unsigned long long)message_id, packet_type, (unsigned long long)message_id);
|
|
free(data);
|
|
return false;
|
|
}
|
|
|
|
/* Duplicate packet */
|
|
if (lossless_ret == 0) {
|
|
free(data);
|
|
return gc_send_message_ack(chat, gconn, message_id, GR_ACK_RECV);
|
|
}
|
|
|
|
/* request missing packet */
|
|
if (lossless_ret == 1) {
|
|
LOGGER_TRACE(chat->log, "received out of order packet from peer %u. expected %llu, got %llu", peer_number,
|
|
(unsigned long long)gconn->received_message_id + 1, (unsigned long long)message_id);
|
|
free(data);
|
|
return gc_send_message_ack(chat, gconn, gconn->received_message_id + 1, GR_ACK_REQ);
|
|
}
|
|
|
|
/* handle packet fragment */
|
|
if (lossless_ret == 3) {
|
|
const bool frag_ret = handle_gc_packet_fragment(c, chat, peer_number, gconn, data, (uint16_t)len, packet_type,
|
|
message_id, userdata);
|
|
free(data);
|
|
return frag_ret;
|
|
}
|
|
|
|
const bool ret = handle_gc_lossless_helper(c, chat, peer_number, data, (uint16_t)len, packet_type, userdata);
|
|
|
|
free(data);
|
|
|
|
if (!ret) {
|
|
return false;
|
|
}
|
|
|
|
/* peer number can change from peer add operations in packet handlers */
|
|
peer_number = get_peer_number_of_enc_pk(chat, sender_pk, false);
|
|
gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn != nullptr && lossless_ret == 2) {
|
|
gc_send_message_ack(chat, gconn, message_id, GR_ACK_RECV);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Handles lossy groupchat message packets.
|
|
*
|
|
* This function assumes the length has already been validated.
|
|
*
|
|
* Return true if packet is handled successfully.
|
|
*/
|
|
non_null(1, 2, 3, 4) nullable(7)
|
|
static bool handle_gc_lossy_packet(const GC_Session *c, GC_Chat *chat, const uint8_t *sender_pk,
|
|
const uint8_t *packet, uint16_t length, bool direct_conn, void *userdata)
|
|
{
|
|
if (length < GC_MIN_LOSSY_PAYLOAD_SIZE) {
|
|
return false;
|
|
}
|
|
|
|
const int peer_number = get_peer_number_of_enc_pk(chat, sender_pk, false);
|
|
|
|
GC_Peer *peer = get_gc_peer(chat, peer_number);
|
|
|
|
if (peer == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
GC_Connection *gconn = &peer->gconn;
|
|
|
|
if (!gconn->handshaked || gconn->pending_delete) {
|
|
LOGGER_DEBUG(chat->log, "Got lossy packet from invalid peer");
|
|
return false;
|
|
}
|
|
|
|
uint8_t *data = (uint8_t *)malloc(length);
|
|
|
|
if (data == nullptr) {
|
|
LOGGER_ERROR(chat->log, "Failed to allocate memory for packet buffer");
|
|
return false;
|
|
}
|
|
|
|
uint8_t packet_type;
|
|
|
|
const int len = group_packet_unwrap(chat->log, gconn, data, nullptr, &packet_type, packet, length);
|
|
|
|
if (len <= 0) {
|
|
Ip_Ntoa ip_str;
|
|
LOGGER_DEBUG(chat->log, "Failed to unwrap lossy packet from %s:%d: %d",
|
|
net_ip_ntoa(&gconn->addr.ip_port.ip, &ip_str), net_ntohs(gconn->addr.ip_port.port), len);
|
|
free(data);
|
|
return false;
|
|
}
|
|
|
|
int ret = -1;
|
|
const uint16_t payload_len = (uint16_t)len;
|
|
|
|
switch (packet_type) {
|
|
case GP_MESSAGE_ACK: {
|
|
ret = handle_gc_message_ack(chat, gconn, data, payload_len);
|
|
break;
|
|
}
|
|
|
|
case GP_PING: {
|
|
ret = handle_gc_ping(chat, gconn, data, payload_len);
|
|
break;
|
|
}
|
|
|
|
case GP_INVITE_RESPONSE_REJECT: {
|
|
ret = handle_gc_invite_response_reject(c, chat, data, payload_len, userdata);
|
|
break;
|
|
}
|
|
|
|
case GP_CUSTOM_PACKET: {
|
|
ret = handle_gc_custom_packet(c, chat, peer, data, payload_len, false, userdata);
|
|
break;
|
|
}
|
|
|
|
case GP_CUSTOM_PRIVATE_PACKET: {
|
|
ret = handle_gc_custom_private_packet(c, chat, peer, data, payload_len, false, userdata);
|
|
break;
|
|
}
|
|
|
|
default: {
|
|
LOGGER_WARNING(chat->log, "Warning: handling invalid lossy group packet type 0x%02x", packet_type);
|
|
free(data);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
free(data);
|
|
|
|
if (ret < 0) {
|
|
LOGGER_DEBUG(chat->log, "Lossy packet handle error %d: type: 0x%02x, peernumber %d", ret, packet_type,
|
|
peer_number);
|
|
return false;
|
|
}
|
|
|
|
const uint64_t tm = mono_time_get(chat->mono_time);
|
|
|
|
if (direct_conn) {
|
|
gconn->last_received_direct_time = tm;
|
|
}
|
|
|
|
gconn->last_received_packet_time = tm;
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Return true if group is either connected or attempting to connect. */
|
|
non_null()
|
|
static bool group_can_handle_packets(const GC_Chat *chat)
|
|
{
|
|
const GC_Conn_State state = chat->connection_state;
|
|
return state == CS_CONNECTING || state == CS_CONNECTED;
|
|
}
|
|
|
|
/** @brief Sends a group packet to appropriate handler function.
|
|
*
|
|
* Returns non-negative value on success.
|
|
* Returns -1 on failure.
|
|
*/
|
|
#define MIN_TCP_PACKET_SIZE (1 + ENC_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE + CRYPTO_MAC_SIZE)
|
|
non_null(1, 3) nullable(5)
|
|
static int handle_gc_tcp_packet(void *object, int id, const uint8_t *packet, uint16_t length, void *userdata)
|
|
{
|
|
const Messenger *m = (Messenger *)object;
|
|
|
|
if (m == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
if (length <= MIN_TCP_PACKET_SIZE) {
|
|
LOGGER_WARNING(m->log, "Got tcp packet with invalid length: %u (expected %u to %u)", length,
|
|
MIN_TCP_PACKET_SIZE, MAX_GC_PACKET_CHUNK_SIZE + MIN_TCP_PACKET_SIZE + ENC_PUBLIC_KEY_SIZE);
|
|
return -1;
|
|
}
|
|
|
|
if (length > MAX_GC_PACKET_CHUNK_SIZE + MIN_TCP_PACKET_SIZE + ENC_PUBLIC_KEY_SIZE) {
|
|
LOGGER_WARNING(m->log, "Got tcp packet with invalid length: %u (expected %u to %u)", length,
|
|
MIN_TCP_PACKET_SIZE, MAX_GC_PACKET_CHUNK_SIZE + MIN_TCP_PACKET_SIZE + ENC_PUBLIC_KEY_SIZE);
|
|
return -1;
|
|
}
|
|
|
|
const uint8_t packet_type = packet[0];
|
|
|
|
const uint8_t *sender_pk = packet + 1;
|
|
|
|
const GC_Session *c = m->group_handler;
|
|
GC_Chat *chat = nullptr;
|
|
|
|
if (packet_type == NET_PACKET_GC_HANDSHAKE) {
|
|
chat = get_chat_by_id(c, packet + 1 + ENC_PUBLIC_KEY_SIZE);
|
|
} else {
|
|
chat = get_chat_by_id(c, sender_pk);
|
|
}
|
|
|
|
if (chat == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
if (!group_can_handle_packets(chat)) {
|
|
return -1;
|
|
}
|
|
|
|
const uint8_t *payload = packet + 1 + ENC_PUBLIC_KEY_SIZE;
|
|
uint16_t payload_len = length - 1 - ENC_PUBLIC_KEY_SIZE;
|
|
|
|
switch (packet_type) {
|
|
case NET_PACKET_GC_LOSSLESS: {
|
|
if (!handle_gc_lossless_packet(c, chat, sender_pk, payload, payload_len, false, userdata)) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
case NET_PACKET_GC_LOSSY: {
|
|
if (!handle_gc_lossy_packet(c, chat, sender_pk, payload, payload_len, false, userdata)) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
case NET_PACKET_GC_HANDSHAKE: {
|
|
// handshake packets have an extra public key in plaintext header
|
|
if (length <= 1 + ENC_PUBLIC_KEY_SIZE + ENC_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE + CRYPTO_MAC_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
payload_len = payload_len - ENC_PUBLIC_KEY_SIZE;
|
|
payload = payload + ENC_PUBLIC_KEY_SIZE;
|
|
|
|
return handle_gc_handshake_packet(chat, sender_pk, nullptr, payload, payload_len, false, userdata);
|
|
}
|
|
|
|
default: {
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
non_null(1, 2, 4) nullable(6)
|
|
static int handle_gc_tcp_oob_packet(void *object, const uint8_t *public_key, unsigned int tcp_connections_number,
|
|
const uint8_t *packet, uint16_t length, void *userdata)
|
|
{
|
|
const Messenger *m = (Messenger *)object;
|
|
|
|
if (m == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
if (length <= GC_MIN_HS_PACKET_PAYLOAD_SIZE) {
|
|
LOGGER_WARNING(m->log, "Got tcp oob packet with invalid length: %u (expected %u to %u)", length,
|
|
GC_MIN_HS_PACKET_PAYLOAD_SIZE, MAX_GC_PACKET_CHUNK_SIZE + CRYPTO_MAC_SIZE + CRYPTO_NONCE_SIZE);
|
|
return -1;
|
|
}
|
|
|
|
if (length > MAX_GC_PACKET_CHUNK_SIZE + CRYPTO_MAC_SIZE + CRYPTO_NONCE_SIZE) {
|
|
LOGGER_WARNING(m->log, "Got tcp oob packet with invalid length: %u (expected %u to %u)", length,
|
|
GC_MIN_HS_PACKET_PAYLOAD_SIZE, MAX_GC_PACKET_CHUNK_SIZE + CRYPTO_MAC_SIZE + CRYPTO_NONCE_SIZE);
|
|
return -1;
|
|
}
|
|
|
|
const GC_Session *c = m->group_handler;
|
|
GC_Chat *chat = get_chat_by_id(c, packet + 1 + ENC_PUBLIC_KEY_SIZE);
|
|
|
|
if (chat == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
if (!group_can_handle_packets(chat)) {
|
|
return -1;
|
|
}
|
|
|
|
const uint8_t packet_type = packet[0];
|
|
|
|
if (packet_type != NET_PACKET_GC_HANDSHAKE) {
|
|
return -1;
|
|
}
|
|
|
|
const uint8_t *sender_pk = packet + 1;
|
|
|
|
const uint8_t *payload = packet + 1 + ENC_PUBLIC_KEY_SIZE + ENC_PUBLIC_KEY_SIZE;
|
|
const uint16_t payload_len = length - 1 - ENC_PUBLIC_KEY_SIZE - ENC_PUBLIC_KEY_SIZE;
|
|
|
|
if (payload_len < GC_MIN_HS_PACKET_PAYLOAD_SIZE + CRYPTO_MAC_SIZE + CRYPTO_NONCE_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
if (handle_gc_handshake_packet(chat, sender_pk, nullptr, payload, payload_len, false, userdata) == -1) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define MIN_UDP_PACKET_SIZE (1 + ENC_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE + CRYPTO_MAC_SIZE)
|
|
non_null(1, 2, 3) nullable(5)
|
|
static int handle_gc_udp_packet(void *object, const IP_Port *ipp, const uint8_t *packet, uint16_t length,
|
|
void *userdata)
|
|
{
|
|
const Messenger *m = (Messenger *)object;
|
|
|
|
if (m == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
if (length <= MIN_UDP_PACKET_SIZE) {
|
|
LOGGER_WARNING(m->log, "Got UDP packet with invalid length: %u (expected %u to %u)", length,
|
|
MIN_UDP_PACKET_SIZE, MAX_GC_PACKET_CHUNK_SIZE + MIN_UDP_PACKET_SIZE + ENC_PUBLIC_KEY_SIZE);
|
|
return -1;
|
|
}
|
|
|
|
if (length > MAX_GC_PACKET_CHUNK_SIZE + MIN_UDP_PACKET_SIZE + ENC_PUBLIC_KEY_SIZE) {
|
|
LOGGER_WARNING(m->log, "Got UDP packet with invalid length: %u (expected %u to %u)", length,
|
|
MIN_UDP_PACKET_SIZE, MAX_GC_PACKET_CHUNK_SIZE + MIN_UDP_PACKET_SIZE + ENC_PUBLIC_KEY_SIZE);
|
|
return -1;
|
|
}
|
|
|
|
const uint8_t packet_type = packet[0];
|
|
const uint8_t *sender_pk = packet + 1;
|
|
|
|
const GC_Session *c = m->group_handler;
|
|
GC_Chat *chat = nullptr;
|
|
|
|
if (packet_type == NET_PACKET_GC_HANDSHAKE) {
|
|
chat = get_chat_by_id(c, packet + 1 + ENC_PUBLIC_KEY_SIZE);
|
|
} else {
|
|
chat = get_chat_by_id(c, sender_pk);
|
|
}
|
|
|
|
if (chat == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
if (!group_can_handle_packets(chat)) {
|
|
return -1;
|
|
}
|
|
|
|
const uint8_t *payload = packet + 1 + ENC_PUBLIC_KEY_SIZE;
|
|
uint16_t payload_len = length - 1 - ENC_PUBLIC_KEY_SIZE;
|
|
bool ret = false;
|
|
|
|
switch (packet_type) {
|
|
case NET_PACKET_GC_LOSSLESS: {
|
|
ret = handle_gc_lossless_packet(c, chat, sender_pk, payload, payload_len, true, userdata);
|
|
break;
|
|
}
|
|
|
|
case NET_PACKET_GC_LOSSY: {
|
|
ret = handle_gc_lossy_packet(c, chat, sender_pk, payload, payload_len, true, userdata);
|
|
break;
|
|
}
|
|
|
|
case NET_PACKET_GC_HANDSHAKE: {
|
|
// handshake packets have an extra public key in plaintext header
|
|
if (length <= 1 + ENC_PUBLIC_KEY_SIZE + ENC_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE + CRYPTO_MAC_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
payload_len = payload_len - ENC_PUBLIC_KEY_SIZE;
|
|
payload = payload + ENC_PUBLIC_KEY_SIZE;
|
|
|
|
ret = handle_gc_handshake_packet(chat, sender_pk, ipp, payload, payload_len, true, userdata) != -1;
|
|
break;
|
|
}
|
|
|
|
default: {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return ret ? 0 : -1;
|
|
}
|
|
|
|
void gc_callback_message(const Messenger *m, gc_message_cb *function)
|
|
{
|
|
GC_Session *c = m->group_handler;
|
|
c->message = function;
|
|
}
|
|
|
|
void gc_callback_private_message(const Messenger *m, gc_private_message_cb *function)
|
|
{
|
|
GC_Session *c = m->group_handler;
|
|
c->private_message = function;
|
|
}
|
|
|
|
void gc_callback_custom_packet(const Messenger *m, gc_custom_packet_cb *function)
|
|
{
|
|
GC_Session *c = m->group_handler;
|
|
c->custom_packet = function;
|
|
}
|
|
|
|
void gc_callback_custom_private_packet(const Messenger *m, gc_custom_private_packet_cb *function)
|
|
{
|
|
GC_Session *c = m->group_handler;
|
|
c->custom_private_packet = function;
|
|
}
|
|
|
|
void gc_callback_moderation(const Messenger *m, gc_moderation_cb *function)
|
|
{
|
|
GC_Session *c = m->group_handler;
|
|
c->moderation = function;
|
|
}
|
|
|
|
void gc_callback_nick_change(const Messenger *m, gc_nick_change_cb *function)
|
|
{
|
|
GC_Session *c = m->group_handler;
|
|
c->nick_change = function;
|
|
}
|
|
|
|
void gc_callback_status_change(const Messenger *m, gc_status_change_cb *function)
|
|
{
|
|
GC_Session *c = m->group_handler;
|
|
c->status_change = function;
|
|
}
|
|
|
|
void gc_callback_topic_change(const Messenger *m, gc_topic_change_cb *function)
|
|
{
|
|
GC_Session *c = m->group_handler;
|
|
c->topic_change = function;
|
|
}
|
|
|
|
void gc_callback_topic_lock(const Messenger *m, gc_topic_lock_cb *function)
|
|
{
|
|
GC_Session *c = m->group_handler;
|
|
c->topic_lock = function;
|
|
}
|
|
|
|
void gc_callback_voice_state(const Messenger *m, gc_voice_state_cb *function)
|
|
{
|
|
GC_Session *c = m->group_handler;
|
|
c->voice_state = function;
|
|
}
|
|
|
|
void gc_callback_peer_limit(const Messenger *m, gc_peer_limit_cb *function)
|
|
{
|
|
GC_Session *c = m->group_handler;
|
|
c->peer_limit = function;
|
|
}
|
|
|
|
void gc_callback_privacy_state(const Messenger *m, gc_privacy_state_cb *function)
|
|
{
|
|
GC_Session *c = m->group_handler;
|
|
c->privacy_state = function;
|
|
}
|
|
|
|
void gc_callback_password(const Messenger *m, gc_password_cb *function)
|
|
{
|
|
GC_Session *c = m->group_handler;
|
|
c->password = function;
|
|
}
|
|
|
|
void gc_callback_peer_join(const Messenger *m, gc_peer_join_cb *function)
|
|
{
|
|
GC_Session *c = m->group_handler;
|
|
c->peer_join = function;
|
|
}
|
|
|
|
void gc_callback_peer_exit(const Messenger *m, gc_peer_exit_cb *function)
|
|
{
|
|
GC_Session *c = m->group_handler;
|
|
c->peer_exit = function;
|
|
}
|
|
|
|
void gc_callback_self_join(const Messenger *m, gc_self_join_cb *function)
|
|
{
|
|
GC_Session *c = m->group_handler;
|
|
c->self_join = function;
|
|
}
|
|
|
|
void gc_callback_rejected(const Messenger *m, gc_rejected_cb *function)
|
|
{
|
|
GC_Session *c = m->group_handler;
|
|
c->rejected = function;
|
|
}
|
|
|
|
/** @brief Deletes peer_number from group.
|
|
*
|
|
* `no_callback` should be set to true if the `peer_exit` callback
|
|
* should not be triggered.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
static bool peer_delete(const GC_Session *c, GC_Chat *chat, uint32_t peer_number, void *userdata)
|
|
{
|
|
GC_Peer *peer = get_gc_peer(chat, peer_number);
|
|
|
|
if (peer == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
// We need to save some peer info for the callback before deleting it
|
|
const bool peer_confirmed = peer->gconn.confirmed;
|
|
const uint32_t peer_id = peer->peer_id;
|
|
uint8_t nick[MAX_GC_NICK_SIZE];
|
|
const uint16_t nick_length = peer->nick_length;
|
|
const GC_Exit_Info exit_info = peer->gconn.exit_info;
|
|
|
|
assert(nick_length <= MAX_GC_NICK_SIZE);
|
|
memcpy(nick, peer->nick, nick_length);
|
|
|
|
gcc_peer_cleanup(&peer->gconn);
|
|
|
|
--chat->numpeers;
|
|
|
|
if (chat->numpeers != peer_number) {
|
|
chat->group[peer_number] = chat->group[chat->numpeers];
|
|
}
|
|
|
|
chat->group[chat->numpeers] = (GC_Peer) {
|
|
0
|
|
};
|
|
|
|
GC_Peer *tmp_group = (GC_Peer *)realloc(chat->group, chat->numpeers * sizeof(GC_Peer));
|
|
|
|
if (tmp_group == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
chat->group = tmp_group;
|
|
|
|
set_gc_peerlist_checksum(chat);
|
|
|
|
if (peer_confirmed) {
|
|
refresh_gc_saved_peers(chat);
|
|
}
|
|
|
|
if (exit_info.exit_type != GC_EXIT_TYPE_NO_CALLBACK && c->peer_exit != nullptr && peer_confirmed) {
|
|
c->peer_exit(c->messenger, chat->group_number, peer_id, exit_info.exit_type, nick,
|
|
nick_length, exit_info.part_message, exit_info.length, userdata);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Updates peer_number with info from `peer` and validates peer data.
|
|
*
|
|
* Returns peer_number on success.
|
|
* Returns -1 on failure.
|
|
*/
|
|
static int peer_update(const GC_Chat *chat, const GC_Peer *peer, uint32_t peer_number)
|
|
{
|
|
if (peer->nick_length == 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (peer->status > GS_BUSY) {
|
|
return -1;
|
|
}
|
|
|
|
if (peer->role > GR_OBSERVER) {
|
|
return -1;
|
|
}
|
|
|
|
GC_Peer *curr_peer = get_gc_peer(chat, peer_number);
|
|
assert(curr_peer != nullptr);
|
|
|
|
curr_peer->status = peer->status;
|
|
curr_peer->nick_length = peer->nick_length;
|
|
|
|
memcpy(curr_peer->nick, peer->nick, peer->nick_length);
|
|
|
|
return peer_number;
|
|
}
|
|
|
|
int peer_add(GC_Chat *chat, const IP_Port *ipp, const uint8_t *public_key)
|
|
{
|
|
if (get_peer_number_of_enc_pk(chat, public_key, false) != -1) {
|
|
return -2;
|
|
}
|
|
|
|
const uint32_t peer_id = get_new_peer_id(chat);
|
|
|
|
if (peer_id == UINT32_MAX) {
|
|
LOGGER_WARNING(chat->log, "Failed to add peer: all peer ID's are taken?");
|
|
return -1;
|
|
}
|
|
|
|
const int peer_number = chat->numpeers;
|
|
int tcp_connection_num = -1;
|
|
|
|
if (peer_number > 0) { // we don't need a connection to ourself
|
|
tcp_connection_num = new_tcp_connection_to(chat->tcp_conn, public_key, 0);
|
|
|
|
if (tcp_connection_num == -1) {
|
|
LOGGER_WARNING(chat->log, "Failed to init tcp connection for peer %d", peer_number);
|
|
}
|
|
}
|
|
|
|
GC_Message_Array_Entry *send = (GC_Message_Array_Entry *)calloc(GCC_BUFFER_SIZE, sizeof(GC_Message_Array_Entry));
|
|
GC_Message_Array_Entry *recv = (GC_Message_Array_Entry *)calloc(GCC_BUFFER_SIZE, sizeof(GC_Message_Array_Entry));
|
|
|
|
if (send == nullptr || recv == nullptr) {
|
|
LOGGER_ERROR(chat->log, "Failed to allocate memory for gconn buffers");
|
|
|
|
if (tcp_connection_num != -1) {
|
|
kill_tcp_connection_to(chat->tcp_conn, tcp_connection_num);
|
|
}
|
|
|
|
free(send);
|
|
free(recv);
|
|
return -1;
|
|
}
|
|
|
|
GC_Peer *tmp_group = (GC_Peer *)realloc(chat->group, (chat->numpeers + 1) * sizeof(GC_Peer));
|
|
|
|
if (tmp_group == nullptr) {
|
|
LOGGER_ERROR(chat->log, "Failed to allocate memory for group realloc");
|
|
|
|
if (tcp_connection_num != -1) {
|
|
kill_tcp_connection_to(chat->tcp_conn, tcp_connection_num);
|
|
}
|
|
|
|
free(send);
|
|
free(recv);
|
|
return -1;
|
|
}
|
|
|
|
++chat->numpeers;
|
|
chat->group = tmp_group;
|
|
|
|
chat->group[peer_number] = (GC_Peer) {
|
|
0
|
|
};
|
|
|
|
GC_Connection *gconn = &chat->group[peer_number].gconn;
|
|
|
|
gconn->send_array = send;
|
|
gconn->recv_array = recv;
|
|
|
|
gcc_set_ip_port(gconn, ipp);
|
|
chat->group[peer_number].role = GR_USER;
|
|
chat->group[peer_number].peer_id = peer_id;
|
|
chat->group[peer_number].ignore = false;
|
|
|
|
crypto_memlock(gconn->session_secret_key, sizeof(gconn->session_secret_key));
|
|
|
|
create_gc_session_keypair(chat->log, chat->rng, gconn->session_public_key, gconn->session_secret_key);
|
|
|
|
if (peer_number > 0) {
|
|
memcpy(gconn->addr.public_key, public_key, ENC_PUBLIC_KEY_SIZE); // we get the sig key in the handshake
|
|
} else {
|
|
memcpy(gconn->addr.public_key, chat->self_public_key, EXT_PUBLIC_KEY_SIZE);
|
|
}
|
|
|
|
const uint64_t tm = mono_time_get(chat->mono_time);
|
|
|
|
gcc_set_send_message_id(gconn, 1);
|
|
gconn->public_key_hash = gc_get_pk_jenkins_hash(public_key);
|
|
gconn->last_received_packet_time = tm;
|
|
gconn->last_key_rotation = tm;
|
|
gconn->tcp_connection_num = tcp_connection_num;
|
|
gconn->last_sent_ip_time = tm;
|
|
gconn->last_sent_ping_time = tm - (GC_PING_TIMEOUT / 2) + (peer_number % (GC_PING_TIMEOUT / 2));
|
|
gconn->self_is_closer = id_closest(get_chat_id(chat->chat_public_key),
|
|
get_enc_key(chat->self_public_key),
|
|
get_enc_key(gconn->addr.public_key)) == 1;
|
|
return peer_number;
|
|
}
|
|
|
|
/** @brief Copies own peer data to `peer`. */
|
|
non_null()
|
|
static void copy_self(const GC_Chat *chat, GC_Peer *peer)
|
|
{
|
|
*peer = (GC_Peer) {
|
|
0
|
|
};
|
|
|
|
peer->status = gc_get_self_status(chat);
|
|
gc_get_self_nick(chat, peer->nick);
|
|
peer->nick_length = gc_get_self_nick_size(chat);
|
|
peer->role = gc_get_self_role(chat);
|
|
}
|
|
|
|
/** @brief Returns true if we haven't received a ping from this peer after n seconds.
|
|
* n depends on whether or not the peer has been confirmed.
|
|
*/
|
|
non_null()
|
|
static bool peer_timed_out(const Mono_Time *mono_time, const GC_Connection *gconn)
|
|
{
|
|
return mono_time_is_timeout(mono_time, gconn->last_received_packet_time, gconn->confirmed
|
|
? GC_CONFIRMED_PEER_TIMEOUT
|
|
: GC_UNCONFIRMED_PEER_TIMEOUT);
|
|
}
|
|
|
|
/** @brief Attempts to send pending handshake packets to peer designated by `gconn`.
|
|
*
|
|
* One request of each type can be sent per `GC_SEND_HANDSHAKE_INTERVAL` seconds.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null()
|
|
static bool send_pending_handshake(const GC_Chat *chat, GC_Connection *gconn)
|
|
{
|
|
if (chat == nullptr || gconn == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
if (gconn->is_pending_handshake_response) {
|
|
if (!mono_time_is_timeout(chat->mono_time, gconn->last_handshake_response, GC_SEND_HANDSHAKE_INTERVAL)) {
|
|
return true;
|
|
}
|
|
|
|
gconn->last_handshake_response = mono_time_get(chat->mono_time);
|
|
|
|
return send_gc_handshake_response(chat, gconn);
|
|
}
|
|
|
|
if (!mono_time_is_timeout(chat->mono_time, gconn->last_handshake_request, GC_SEND_HANDSHAKE_INTERVAL)) {
|
|
return true;
|
|
}
|
|
|
|
gconn->last_handshake_request = mono_time_get(chat->mono_time);
|
|
|
|
if (gconn->is_oob_handshake) {
|
|
return send_gc_oob_handshake_request(chat, gconn);
|
|
}
|
|
|
|
return send_gc_handshake_packet(chat, gconn, GH_REQUEST, gconn->pending_handshake_type, chat->join_type);
|
|
}
|
|
|
|
#define GC_TCP_RELAY_SEND_INTERVAL (60 * 3)
|
|
non_null(1, 2) nullable(3)
|
|
static void do_peer_connections(const GC_Session *c, GC_Chat *chat, void *userdata)
|
|
{
|
|
for (uint32_t i = 1; i < chat->numpeers; ++i) {
|
|
GC_Connection *gconn = get_gc_connection(chat, i);
|
|
assert(gconn != nullptr);
|
|
|
|
if (gconn->pending_delete) {
|
|
continue;
|
|
}
|
|
|
|
if (peer_timed_out(chat->mono_time, gconn)) {
|
|
gcc_mark_for_deletion(gconn, chat->tcp_conn, GC_EXIT_TYPE_TIMEOUT, nullptr, 0);
|
|
continue;
|
|
}
|
|
|
|
gcc_resend_packets(chat, gconn);
|
|
|
|
if (gconn->tcp_relays_count > 0 &&
|
|
mono_time_is_timeout(chat->mono_time, gconn->last_sent_tcp_relays_time, GC_TCP_RELAY_SEND_INTERVAL)) {
|
|
if (gconn->confirmed) {
|
|
send_gc_tcp_relays(chat, gconn);
|
|
gconn->last_sent_tcp_relays_time = mono_time_get(chat->mono_time);
|
|
}
|
|
}
|
|
|
|
gcc_check_recv_array(c, chat, gconn, i, userdata); // may change peer numbers
|
|
}
|
|
}
|
|
|
|
/** @brief Executes pending handshakes for peers.
|
|
*
|
|
* If our peerlist is empty we periodically try to
|
|
* load peers from our saved peers list and initiate handshake requests with them.
|
|
*/
|
|
#define LOAD_PEERS_TIMEOUT (GC_UNCONFIRMED_PEER_TIMEOUT + 10)
|
|
non_null()
|
|
static void do_handshakes(GC_Chat *chat)
|
|
{
|
|
for (uint32_t i = 1; i < chat->numpeers; ++i) {
|
|
GC_Connection *gconn = get_gc_connection(chat, i);
|
|
assert(gconn != nullptr);
|
|
|
|
if (gconn->handshaked || gconn->pending_delete) {
|
|
continue;
|
|
}
|
|
|
|
send_pending_handshake(chat, gconn);
|
|
}
|
|
|
|
if (chat->numpeers <= 1) {
|
|
const uint64_t tm = mono_time_get(chat->mono_time);
|
|
|
|
if (mono_time_is_timeout(chat->mono_time, chat->last_time_peers_loaded, LOAD_PEERS_TIMEOUT)) {
|
|
load_gc_peers(chat, chat->saved_peers, GC_MAX_SAVED_PEERS);
|
|
chat->last_time_peers_loaded = tm;
|
|
}
|
|
}
|
|
}
|
|
|
|
/** @brief Adds `gconn` to the group timeout list. */
|
|
non_null()
|
|
static void add_gc_peer_timeout_list(GC_Chat *chat, const GC_Connection *gconn)
|
|
{
|
|
const size_t idx = chat->timeout_list_index;
|
|
const uint64_t tm = mono_time_get(chat->mono_time);
|
|
|
|
copy_gc_saved_peer(chat->rng, gconn, &chat->timeout_list[idx].addr);
|
|
|
|
chat->timeout_list[idx].last_seen = tm;
|
|
chat->timeout_list[idx].last_reconn_try = 0;
|
|
chat->timeout_list_index = (idx + 1) % MAX_GC_SAVED_TIMEOUTS;
|
|
}
|
|
|
|
non_null(1, 2) nullable(3)
|
|
static void do_peer_delete(const GC_Session *c, GC_Chat *chat, void *userdata)
|
|
{
|
|
for (uint32_t i = 1; i < chat->numpeers; ++i) {
|
|
const GC_Connection *gconn = get_gc_connection(chat, i);
|
|
assert(gconn != nullptr);
|
|
|
|
if (gconn->pending_delete) {
|
|
const GC_Exit_Info *exit_info = &gconn->exit_info;
|
|
|
|
if (exit_info->exit_type == GC_EXIT_TYPE_TIMEOUT && gconn->confirmed) {
|
|
add_gc_peer_timeout_list(chat, gconn);
|
|
}
|
|
|
|
if (!peer_delete(c, chat, i, userdata)) {
|
|
LOGGER_ERROR(chat->log, "Failed to delete peer %u", i);
|
|
}
|
|
|
|
if (i >= chat->numpeers) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/** @brief Constructs and sends a ping packet to `gconn` containing info needed for group syncing
|
|
* and connection maintenance.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null()
|
|
static bool ping_peer(const GC_Chat *chat, const GC_Connection *gconn)
|
|
{
|
|
const uint16_t buf_size = GC_PING_PACKET_MIN_DATA_SIZE + sizeof(IP_Port);
|
|
uint8_t *data = (uint8_t *)malloc(buf_size);
|
|
|
|
if (data == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
const uint16_t roles_checksum = chat->moderation.sanctions_creds.checksum + chat->roles_checksum;
|
|
uint16_t packed_len = 0;
|
|
|
|
net_pack_u16(data, chat->peers_checksum);
|
|
packed_len += sizeof(uint16_t);
|
|
|
|
net_pack_u16(data + packed_len, get_gc_confirmed_numpeers(chat));
|
|
packed_len += sizeof(uint16_t);
|
|
|
|
net_pack_u32(data + packed_len, chat->shared_state.version);
|
|
packed_len += sizeof(uint32_t);
|
|
|
|
net_pack_u32(data + packed_len, chat->moderation.sanctions_creds.version);
|
|
packed_len += sizeof(uint32_t);
|
|
|
|
net_pack_u16(data + packed_len, roles_checksum);
|
|
packed_len += sizeof(uint16_t);
|
|
|
|
net_pack_u32(data + packed_len, chat->topic_info.version);
|
|
packed_len += sizeof(uint32_t);
|
|
|
|
net_pack_u16(data + packed_len, chat->topic_info.checksum);
|
|
packed_len += sizeof(uint16_t);
|
|
|
|
if (packed_len != GC_PING_PACKET_MIN_DATA_SIZE) {
|
|
LOGGER_FATAL(chat->log, "Packed length is impossible");
|
|
}
|
|
|
|
if (chat->self_udp_status == SELF_UDP_STATUS_WAN && !gcc_conn_is_direct(chat->mono_time, gconn)
|
|
&& mono_time_is_timeout(chat->mono_time, gconn->last_sent_ip_time, GC_SEND_IP_PORT_INTERVAL)) {
|
|
|
|
const int packed_ipp_len = pack_ip_port(chat->log, data + buf_size - sizeof(IP_Port), sizeof(IP_Port),
|
|
&chat->self_ip_port);
|
|
|
|
if (packed_ipp_len > 0) {
|
|
packed_len += packed_ipp_len;
|
|
}
|
|
}
|
|
|
|
if (!send_lossy_group_packet(chat, gconn, data, packed_len, GP_PING)) {
|
|
free(data);
|
|
return false;
|
|
}
|
|
|
|
free(data);
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Sends a ping packet to peers that haven't been pinged in at least GC_PING_TIMEOUT seconds, and
|
|
* a key rotation request to peers with whom we haven't refreshed keys in at least GC_KEY_ROTATION_TIMEOUT
|
|
* seconds.
|
|
*
|
|
* Ping packet always includes your confirmed peer count, a peer list checksum, your shared state and sanctions
|
|
* list version for syncing purposes. We also occasionally try to send our own IP info to peers that we
|
|
* do not have a direct connection with.
|
|
*/
|
|
#define GC_DO_PINGS_INTERVAL 2
|
|
non_null()
|
|
static void do_gc_ping_and_key_rotation(GC_Chat *chat)
|
|
{
|
|
if (!mono_time_is_timeout(chat->mono_time, chat->last_ping_interval, GC_DO_PINGS_INTERVAL)) {
|
|
return;
|
|
}
|
|
|
|
const uint64_t tm = mono_time_get(chat->mono_time);
|
|
|
|
for (uint32_t i = 1; i < chat->numpeers; ++i) {
|
|
GC_Connection *gconn = get_gc_connection(chat, i);
|
|
assert(gconn != nullptr);
|
|
|
|
if (!gconn->confirmed) {
|
|
continue;
|
|
}
|
|
|
|
if (mono_time_is_timeout(chat->mono_time, gconn->last_sent_ping_time, GC_PING_TIMEOUT)) {
|
|
if (ping_peer(chat, gconn)) {
|
|
gconn->last_sent_ping_time = tm;
|
|
}
|
|
}
|
|
|
|
if (mono_time_is_timeout(chat->mono_time, gconn->last_key_rotation, GC_KEY_ROTATION_TIMEOUT)) {
|
|
if (send_peer_key_rotation_request(chat, gconn)) {
|
|
gconn->last_key_rotation = tm;
|
|
}
|
|
}
|
|
}
|
|
|
|
chat->last_ping_interval = tm;
|
|
}
|
|
|
|
non_null()
|
|
static void do_new_connection_cooldown(GC_Chat *chat)
|
|
{
|
|
if (chat->connection_o_metre == 0) {
|
|
return;
|
|
}
|
|
|
|
const uint64_t tm = mono_time_get(chat->mono_time);
|
|
|
|
if (chat->connection_cooldown_timer < tm) {
|
|
chat->connection_cooldown_timer = tm;
|
|
--chat->connection_o_metre;
|
|
|
|
if (chat->connection_o_metre == 0 && chat->block_handshakes) {
|
|
chat->block_handshakes = false;
|
|
LOGGER_DEBUG(chat->log, "Unblocking handshakes");
|
|
}
|
|
}
|
|
}
|
|
|
|
#define TCP_RELAYS_CHECK_INTERVAL 10
|
|
non_null(1, 2) nullable(3)
|
|
static void do_gc_tcp(const GC_Session *c, GC_Chat *chat, void *userdata)
|
|
{
|
|
if (chat->tcp_conn == nullptr || !group_can_handle_packets(chat)) {
|
|
return;
|
|
}
|
|
|
|
do_tcp_connections(chat->log, chat->tcp_conn, userdata);
|
|
|
|
for (uint32_t i = 1; i < chat->numpeers; ++i) {
|
|
const GC_Connection *gconn = get_gc_connection(chat, i);
|
|
assert(gconn != nullptr);
|
|
|
|
const bool tcp_set = !gcc_conn_is_direct(chat->mono_time, gconn);
|
|
set_tcp_connection_to_status(chat->tcp_conn, gconn->tcp_connection_num, tcp_set);
|
|
}
|
|
|
|
if (mono_time_is_timeout(chat->mono_time, chat->last_checked_tcp_relays, TCP_RELAYS_CHECK_INTERVAL)
|
|
&& tcp_connected_relays_count(chat->tcp_conn) != chat->connected_tcp_relays) {
|
|
add_tcp_relays_to_chat(c, chat);
|
|
chat->connected_tcp_relays = tcp_connected_relays_count(chat->tcp_conn);
|
|
chat->last_checked_tcp_relays = mono_time_get(chat->mono_time);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Updates our TCP and UDP connection status and flags a new announcement if our connection has
|
|
* changed and we have either a UDP or TCP connection.
|
|
*/
|
|
#define GC_SELF_CONNECTION_CHECK_INTERVAL 5 // how often in seconds we should run this function
|
|
#define GC_SELF_REFRESH_ANNOUNCE_INTERVAL (60 * 20) // how often in seconds we force refresh our group announcement
|
|
non_null()
|
|
static void do_self_connection(const GC_Session *c, GC_Chat *chat)
|
|
{
|
|
if (!mono_time_is_timeout(chat->mono_time, chat->last_self_announce_check, GC_SELF_CONNECTION_CHECK_INTERVAL)) {
|
|
return;
|
|
}
|
|
|
|
const unsigned int self_udp_status = ipport_self_copy(c->messenger->dht, &chat->self_ip_port);
|
|
const bool udp_change = (chat->self_udp_status != self_udp_status) && (self_udp_status != SELF_UDP_STATUS_NONE);
|
|
|
|
// We flag a group announce if our UDP status has changed since last run, or if our last announced TCP
|
|
// relay is no longer valid. Additionally, we will always flag an announce in the specified interval
|
|
// regardless of the prior conditions. Private groups are never announced.
|
|
if (is_public_chat(chat) &&
|
|
((udp_change || !tcp_relay_is_valid(chat->tcp_conn, chat->announced_tcp_relay_pk))
|
|
|| mono_time_is_timeout(chat->mono_time, chat->last_time_self_announce, GC_SELF_REFRESH_ANNOUNCE_INTERVAL))) {
|
|
chat->update_self_announces = true;
|
|
}
|
|
|
|
chat->self_udp_status = (Self_UDP_Status) self_udp_status;
|
|
chat->last_self_announce_check = mono_time_get(chat->mono_time);
|
|
}
|
|
|
|
/** @brief Attempts to initiate a new connection with peers in the timeout list.
|
|
*
|
|
* This function is not used for public groups as the DHT and group sync mechanism
|
|
* should automatically do this for us.
|
|
*/
|
|
#define TIMED_OUT_RECONN_INTERVAL 2
|
|
non_null()
|
|
static void do_timed_out_reconn(GC_Chat *chat)
|
|
{
|
|
if (is_public_chat(chat)) {
|
|
return;
|
|
}
|
|
|
|
if (!mono_time_is_timeout(chat->mono_time, chat->last_timed_out_reconn_try, TIMED_OUT_RECONN_INTERVAL)) {
|
|
return;
|
|
}
|
|
|
|
const uint64_t curr_time = mono_time_get(chat->mono_time);
|
|
|
|
for (size_t i = 0; i < MAX_GC_SAVED_TIMEOUTS; ++i) {
|
|
GC_TimedOutPeer *timeout = &chat->timeout_list[i];
|
|
|
|
if (timeout->last_seen == 0 || timeout->last_seen == curr_time) {
|
|
continue;
|
|
}
|
|
|
|
if (mono_time_is_timeout(chat->mono_time, timeout->last_seen, GC_TIMED_OUT_STALE_TIMEOUT)
|
|
|| get_peer_number_of_enc_pk(chat, timeout->addr.public_key, true) != -1) {
|
|
*timeout = (GC_TimedOutPeer) {
|
|
{{
|
|
0
|
|
}
|
|
}
|
|
};
|
|
continue;
|
|
}
|
|
|
|
if (mono_time_is_timeout(chat->mono_time, timeout->last_reconn_try, GC_TIMED_OUT_RECONN_TIMEOUT)) {
|
|
if (load_gc_peers(chat, &timeout->addr, 1) != 1) {
|
|
LOGGER_WARNING(chat->log, "Failed to load timed out peer");
|
|
}
|
|
|
|
timeout->last_reconn_try = curr_time;
|
|
}
|
|
}
|
|
|
|
chat->last_timed_out_reconn_try = curr_time;
|
|
}
|
|
|
|
void do_gc(GC_Session *c, void *userdata)
|
|
{
|
|
if (c == nullptr) {
|
|
return;
|
|
}
|
|
|
|
for (uint32_t i = 0; i < c->chats_index; ++i) {
|
|
GC_Chat *chat = &c->chats[i];
|
|
|
|
const GC_Conn_State state = chat->connection_state;
|
|
|
|
if (state == CS_NONE) {
|
|
continue;
|
|
}
|
|
|
|
if (state != CS_DISCONNECTED) {
|
|
do_peer_connections(c, chat, userdata);
|
|
do_gc_tcp(c, chat, userdata);
|
|
do_handshakes(chat);
|
|
do_self_connection(c, chat);
|
|
}
|
|
|
|
if (chat->connection_state == CS_CONNECTED) {
|
|
do_gc_ping_and_key_rotation(chat);
|
|
do_timed_out_reconn(chat);
|
|
}
|
|
|
|
do_new_connection_cooldown(chat);
|
|
do_peer_delete(c, chat, userdata);
|
|
}
|
|
}
|
|
|
|
/** @brief Set the size of the groupchat list to n.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null()
|
|
static bool realloc_groupchats(GC_Session *c, uint32_t n)
|
|
{
|
|
if (n == 0) {
|
|
free(c->chats);
|
|
c->chats = nullptr;
|
|
return true;
|
|
}
|
|
|
|
GC_Chat *temp = (GC_Chat *)realloc(c->chats, n * sizeof(GC_Chat));
|
|
|
|
if (temp == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
c->chats = temp;
|
|
return true;
|
|
}
|
|
|
|
non_null()
|
|
static int get_new_group_index(GC_Session *c)
|
|
{
|
|
if (c == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
for (uint32_t i = 0; i < c->chats_index; ++i) {
|
|
if (c->chats[i].connection_state == CS_NONE) {
|
|
return i;
|
|
}
|
|
}
|
|
|
|
if (!realloc_groupchats(c, c->chats_index + 1)) {
|
|
return -1;
|
|
}
|
|
|
|
const int new_index = c->chats_index;
|
|
|
|
c->chats[new_index] = empty_gc_chat;
|
|
|
|
memset(&c->chats[new_index].saved_invites, -1, sizeof(c->chats[new_index].saved_invites));
|
|
|
|
++c->chats_index;
|
|
|
|
return new_index;
|
|
}
|
|
|
|
/** Attempts to associate new TCP relays with our group connection. */
|
|
static void add_tcp_relays_to_chat(const GC_Session *c, GC_Chat *chat)
|
|
{
|
|
const Messenger *m = c->messenger;
|
|
|
|
const uint32_t num_relays = tcp_connections_count(nc_get_tcp_c(m->net_crypto));
|
|
|
|
if (num_relays == 0) {
|
|
return;
|
|
}
|
|
|
|
Node_format *tcp_relays = (Node_format *)calloc(num_relays, sizeof(Node_format));
|
|
|
|
if (tcp_relays == nullptr) {
|
|
return;
|
|
}
|
|
|
|
const uint32_t num_copied = tcp_copy_connected_relays(nc_get_tcp_c(m->net_crypto), tcp_relays, (uint16_t)num_relays);
|
|
|
|
for (uint32_t i = 0; i < num_copied; ++i) {
|
|
add_tcp_relay_global(chat->tcp_conn, &tcp_relays[i].ip_port, tcp_relays[i].public_key);
|
|
}
|
|
|
|
free(tcp_relays);
|
|
}
|
|
|
|
non_null()
|
|
static bool init_gc_tcp_connection(const GC_Session *c, GC_Chat *chat)
|
|
{
|
|
const Messenger *m = c->messenger;
|
|
|
|
chat->tcp_conn = new_tcp_connections(chat->log, chat->mem, chat->rng, m->ns, chat->mono_time, chat->self_secret_key,
|
|
&m->options.proxy_info);
|
|
|
|
if (chat->tcp_conn == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
add_tcp_relays_to_chat(c, chat);
|
|
|
|
set_packet_tcp_connection_callback(chat->tcp_conn, &handle_gc_tcp_packet, c->messenger);
|
|
set_oob_packet_tcp_connection_callback(chat->tcp_conn, &handle_gc_tcp_oob_packet, c->messenger);
|
|
|
|
return true;
|
|
}
|
|
|
|
/** Initializes default shared state values. */
|
|
non_null()
|
|
static void init_gc_shared_state(GC_Chat *chat, const Group_Privacy_State privacy_state)
|
|
{
|
|
chat->shared_state.maxpeers = MAX_GC_PEERS_DEFAULT;
|
|
chat->shared_state.privacy_state = privacy_state;
|
|
chat->shared_state.topic_lock = GC_TOPIC_LOCK_ENABLED;
|
|
chat->shared_state.voice_state = GV_ALL;
|
|
}
|
|
|
|
/** @brief Initializes the group shared state for the founder.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null()
|
|
static bool init_gc_shared_state_founder(GC_Chat *chat, Group_Privacy_State privacy_state, const uint8_t *group_name,
|
|
uint16_t name_length)
|
|
{
|
|
memcpy(chat->shared_state.founder_public_key, chat->self_public_key, EXT_PUBLIC_KEY_SIZE);
|
|
memcpy(chat->shared_state.group_name, group_name, name_length);
|
|
chat->shared_state.group_name_len = name_length;
|
|
chat->shared_state.privacy_state = privacy_state;
|
|
|
|
return sign_gc_shared_state(chat);
|
|
}
|
|
|
|
/** @brief Initializes shared state for moderation object.
|
|
*
|
|
* This must be called before any moderation
|
|
* or sanctions related operations.
|
|
*/
|
|
non_null()
|
|
static void init_gc_moderation(GC_Chat *chat)
|
|
{
|
|
memcpy(chat->moderation.founder_public_sig_key,
|
|
get_sig_pk(chat->shared_state.founder_public_key), SIG_PUBLIC_KEY_SIZE);
|
|
memcpy(chat->moderation.self_public_sig_key, get_sig_pk(chat->self_public_key), SIG_PUBLIC_KEY_SIZE);
|
|
memcpy(chat->moderation.self_secret_sig_key, get_sig_pk(chat->self_secret_key), SIG_SECRET_KEY_SIZE);
|
|
chat->moderation.shared_state_version = chat->shared_state.version;
|
|
chat->moderation.log = chat->log;
|
|
chat->moderation.mem = chat->mem;
|
|
}
|
|
|
|
non_null()
|
|
static bool create_new_chat_ext_keypair(GC_Chat *chat);
|
|
|
|
non_null()
|
|
static int create_new_group(GC_Session *c, const uint8_t *nick, size_t nick_length, bool founder,
|
|
const Group_Privacy_State privacy_state)
|
|
{
|
|
if (nick == nullptr || nick_length == 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (nick_length > MAX_GC_NICK_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
const int group_number = get_new_group_index(c);
|
|
|
|
if (group_number == -1) {
|
|
return -1;
|
|
}
|
|
|
|
Messenger *m = c->messenger;
|
|
GC_Chat *chat = &c->chats[group_number];
|
|
|
|
chat->log = m->log;
|
|
chat->mem = m->mem;
|
|
chat->rng = m->rng;
|
|
|
|
const uint64_t tm = mono_time_get(m->mono_time);
|
|
|
|
chat->group_number = group_number;
|
|
chat->numpeers = 0;
|
|
chat->connection_state = CS_CONNECTING;
|
|
chat->net = m->net;
|
|
chat->mono_time = m->mono_time;
|
|
chat->last_ping_interval = tm;
|
|
chat->friend_connection_id = -1;
|
|
|
|
if (!create_new_chat_ext_keypair(chat)) {
|
|
LOGGER_ERROR(chat->log, "Failed to create extended keypair");
|
|
group_delete(c, chat);
|
|
return -1;
|
|
}
|
|
|
|
if (!init_gc_tcp_connection(c, chat)) {
|
|
group_delete(c, chat);
|
|
return -1;
|
|
}
|
|
|
|
if (peer_add(chat, nullptr, chat->self_public_key) != 0) { /* you are always peer_number/index 0 */
|
|
group_delete(c, chat);
|
|
return -1;
|
|
}
|
|
|
|
if (!self_gc_set_nick(chat, nick, (uint16_t)nick_length)) {
|
|
group_delete(c, chat);
|
|
return -1;
|
|
}
|
|
|
|
self_gc_set_status(chat, GS_NONE);
|
|
self_gc_set_role(chat, founder ? GR_FOUNDER : GR_USER);
|
|
self_gc_set_confirmed(chat, true);
|
|
self_gc_set_ext_public_key(chat, chat->self_public_key);
|
|
|
|
init_gc_shared_state(chat, privacy_state);
|
|
init_gc_moderation(chat);
|
|
|
|
return group_number;
|
|
}
|
|
|
|
/** @brief Inits the sanctions list credentials.
|
|
*
|
|
* This should be called by the group founder on creation.
|
|
*
|
|
* This function must be called after `init_gc_moderation()`.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null()
|
|
static bool init_gc_sanctions_creds(GC_Chat *chat)
|
|
{
|
|
return sanctions_list_make_creds(&chat->moderation);
|
|
}
|
|
|
|
/** @brief Attempts to add `num_addrs` peers from `addrs` to our peerlist and initiate invite requests
|
|
* for all of them.
|
|
*
|
|
* Returns the number of peers successfully loaded.
|
|
*/
|
|
static size_t load_gc_peers(GC_Chat *chat, const GC_SavedPeerInfo *addrs, uint16_t num_addrs)
|
|
{
|
|
size_t count = 0;
|
|
|
|
for (size_t i = 0; i < num_addrs; ++i) {
|
|
if (!saved_peer_is_valid(&addrs[i])) {
|
|
continue;
|
|
}
|
|
|
|
const bool ip_port_is_set = ipport_isset(&addrs[i].ip_port);
|
|
const IP_Port *ip_port = ip_port_is_set ? &addrs[i].ip_port : nullptr;
|
|
|
|
const int peer_number = peer_add(chat, ip_port, addrs[i].public_key);
|
|
|
|
GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
continue;
|
|
}
|
|
|
|
add_tcp_relay_global(chat->tcp_conn, &addrs[i].tcp_relay.ip_port, addrs[i].tcp_relay.public_key);
|
|
|
|
const int add_tcp_result = add_tcp_relay_connection(chat->tcp_conn, gconn->tcp_connection_num,
|
|
&addrs[i].tcp_relay.ip_port,
|
|
addrs[i].tcp_relay.public_key);
|
|
|
|
if (add_tcp_result == -1 && !ip_port_is_set) {
|
|
gcc_mark_for_deletion(gconn, chat->tcp_conn, GC_EXIT_TYPE_DISCONNECTED, nullptr, 0);
|
|
continue;
|
|
}
|
|
|
|
if (add_tcp_result == 0) {
|
|
const int save_tcp_result = gcc_save_tcp_relay(chat->rng, gconn, &addrs[i].tcp_relay);
|
|
|
|
if (save_tcp_result == -1) {
|
|
gcc_mark_for_deletion(gconn, chat->tcp_conn, GC_EXIT_TYPE_DISCONNECTED, nullptr, 0);
|
|
continue;
|
|
}
|
|
|
|
memcpy(gconn->oob_relay_pk, addrs[i].tcp_relay.public_key, CRYPTO_PUBLIC_KEY_SIZE);
|
|
}
|
|
|
|
const uint64_t tm = mono_time_get(chat->mono_time);
|
|
|
|
gconn->is_oob_handshake = !gcc_direct_conn_is_possible(chat, gconn);
|
|
gconn->is_pending_handshake_response = false;
|
|
gconn->pending_handshake_type = HS_INVITE_REQUEST;
|
|
gconn->last_received_packet_time = tm;
|
|
gconn->last_key_rotation = tm;
|
|
|
|
++count;
|
|
}
|
|
|
|
update_gc_peer_roles(chat);
|
|
|
|
return count;
|
|
}
|
|
|
|
void gc_group_save(const GC_Chat *chat, Bin_Pack *bp)
|
|
{
|
|
gc_save_pack_group(chat, bp);
|
|
}
|
|
|
|
int gc_group_load(GC_Session *c, Bin_Unpack *bu)
|
|
{
|
|
const int group_number = get_new_group_index(c);
|
|
|
|
if (group_number < 0) {
|
|
return -1;
|
|
}
|
|
|
|
const uint64_t tm = mono_time_get(c->messenger->mono_time);
|
|
|
|
Messenger *m = c->messenger;
|
|
GC_Chat *chat = &c->chats[group_number];
|
|
|
|
chat->group_number = group_number;
|
|
chat->numpeers = 0;
|
|
chat->net = m->net;
|
|
chat->mono_time = m->mono_time;
|
|
chat->log = m->log;
|
|
chat->mem = m->mem;
|
|
chat->rng = m->rng;
|
|
chat->last_ping_interval = tm;
|
|
chat->friend_connection_id = -1;
|
|
|
|
// Initialise these first, because we may need to log/dealloc things on cleanup.
|
|
chat->moderation.log = m->log;
|
|
chat->moderation.mem = m->mem;
|
|
|
|
if (!gc_load_unpack_group(chat, bu)) {
|
|
LOGGER_ERROR(chat->log, "Failed to unpack group");
|
|
return -1;
|
|
}
|
|
|
|
init_gc_moderation(chat);
|
|
|
|
if (!init_gc_tcp_connection(c, chat)) {
|
|
LOGGER_ERROR(chat->log, "Failed to init tcp connection");
|
|
return -1;
|
|
}
|
|
|
|
if (chat->connection_state == CS_DISCONNECTED) {
|
|
return group_number;
|
|
}
|
|
|
|
if (is_public_chat(chat)) {
|
|
if (!m_create_group_connection(m, chat)) {
|
|
LOGGER_ERROR(chat->log, "Failed to initialize group friend connection");
|
|
}
|
|
}
|
|
|
|
return group_number;
|
|
}
|
|
|
|
int gc_group_add(GC_Session *c, Group_Privacy_State privacy_state, const uint8_t *group_name,
|
|
uint16_t group_name_length,
|
|
const uint8_t *nick, size_t nick_length)
|
|
{
|
|
if (group_name_length > MAX_GC_GROUP_NAME_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
if (nick_length > MAX_GC_NICK_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
if (group_name_length == 0 || group_name == nullptr) {
|
|
return -2;
|
|
}
|
|
|
|
if (nick_length == 0 || nick == nullptr) {
|
|
return -2;
|
|
}
|
|
|
|
const int group_number = create_new_group(c, nick, nick_length, true, privacy_state);
|
|
|
|
if (group_number == -1) {
|
|
return -3;
|
|
}
|
|
|
|
GC_Chat *chat = gc_get_group(c, group_number);
|
|
|
|
if (chat == nullptr) {
|
|
return -3;
|
|
}
|
|
|
|
crypto_memlock(chat->chat_secret_key, sizeof(chat->chat_secret_key));
|
|
|
|
create_extended_keypair(chat->chat_public_key, chat->chat_secret_key);
|
|
|
|
if (!init_gc_shared_state_founder(chat, privacy_state, group_name, group_name_length)) {
|
|
group_delete(c, chat);
|
|
return -4;
|
|
}
|
|
|
|
init_gc_moderation(chat);
|
|
|
|
if (!init_gc_sanctions_creds(chat)) {
|
|
group_delete(c, chat);
|
|
return -4;
|
|
}
|
|
|
|
if (gc_set_topic(chat, nullptr, 0) != 0) {
|
|
group_delete(c, chat);
|
|
return -4;
|
|
}
|
|
|
|
chat->join_type = HJ_PRIVATE;
|
|
chat->connection_state = CS_CONNECTED;
|
|
chat->time_connected = mono_time_get(c->messenger->mono_time);
|
|
|
|
if (is_public_chat(chat)) {
|
|
if (!m_create_group_connection(c->messenger, chat)) {
|
|
LOGGER_ERROR(chat->log, "Failed to initialize group friend connection");
|
|
group_delete(c, chat);
|
|
return -5;
|
|
}
|
|
|
|
chat->join_type = HJ_PUBLIC;
|
|
}
|
|
|
|
update_gc_peer_roles(chat);
|
|
|
|
return group_number;
|
|
}
|
|
|
|
int gc_group_join(GC_Session *c, const uint8_t *chat_id, const uint8_t *nick, size_t nick_length, const uint8_t *passwd,
|
|
uint16_t passwd_len)
|
|
{
|
|
if (chat_id == nullptr || group_exists(c, chat_id) || getfriend_id(c->messenger, chat_id) != -1) {
|
|
return -2;
|
|
}
|
|
|
|
if (nick_length > MAX_GC_NICK_SIZE) {
|
|
return -3;
|
|
}
|
|
|
|
if (nick == nullptr || nick_length == 0) {
|
|
return -4;
|
|
}
|
|
|
|
const int group_number = create_new_group(c, nick, nick_length, false, GI_PUBLIC);
|
|
|
|
if (group_number == -1) {
|
|
return -1;
|
|
}
|
|
|
|
GC_Chat *chat = gc_get_group(c, group_number);
|
|
|
|
if (chat == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
if (!expand_chat_id(chat->chat_public_key, chat_id)) {
|
|
group_delete(c, chat);
|
|
return -1;
|
|
}
|
|
|
|
chat->connection_state = CS_CONNECTING;
|
|
|
|
if (passwd != nullptr && passwd_len > 0) {
|
|
if (!set_gc_password_local(chat, passwd, passwd_len)) {
|
|
group_delete(c, chat);
|
|
return -5;
|
|
}
|
|
}
|
|
|
|
if (!m_create_group_connection(c->messenger, chat)) {
|
|
group_delete(c, chat);
|
|
return -6;
|
|
}
|
|
|
|
update_gc_peer_roles(chat);
|
|
|
|
return group_number;
|
|
}
|
|
|
|
bool gc_disconnect_from_group(const GC_Session *c, GC_Chat *chat)
|
|
{
|
|
if (c == nullptr || chat == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
chat->connection_state = CS_DISCONNECTED;
|
|
|
|
send_gc_broadcast_message(chat, nullptr, 0, GM_PEER_EXIT);
|
|
|
|
for (uint32_t i = 1; i < chat->numpeers; ++i) {
|
|
GC_Connection *gconn = get_gc_connection(chat, i);
|
|
assert(gconn != nullptr);
|
|
|
|
gcc_mark_for_deletion(gconn, chat->tcp_conn, GC_EXIT_TYPE_SELF_DISCONNECTED, nullptr, 0);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
int gc_rejoin_group(GC_Session *c, GC_Chat *chat)
|
|
{
|
|
if (c == nullptr || chat == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
chat->time_connected = 0;
|
|
|
|
if (group_can_handle_packets(chat)) {
|
|
send_gc_self_exit(chat, nullptr, 0);
|
|
}
|
|
|
|
for (uint32_t i = 1; i < chat->numpeers; ++i) {
|
|
GC_Connection *gconn = get_gc_connection(chat, i);
|
|
assert(gconn != nullptr);
|
|
|
|
gcc_mark_for_deletion(gconn, chat->tcp_conn, GC_EXIT_TYPE_SELF_DISCONNECTED, nullptr, 0);
|
|
}
|
|
|
|
if (is_public_chat(chat)) {
|
|
kill_group_friend_connection(c, chat);
|
|
|
|
if (!m_create_group_connection(c->messenger, chat)) {
|
|
LOGGER_WARNING(chat->log, "Failed to create new messenger connection for group");
|
|
return -2;
|
|
}
|
|
|
|
chat->update_self_announces = true;
|
|
}
|
|
|
|
chat->connection_state = CS_CONNECTING;
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool group_not_added(const GC_Session *c, const uint8_t *chat_id, uint32_t length)
|
|
{
|
|
if (length < CHAT_ID_SIZE) {
|
|
return false;
|
|
}
|
|
|
|
return !group_exists(c, chat_id);
|
|
}
|
|
|
|
int gc_invite_friend(const GC_Session *c, GC_Chat *chat, int32_t friend_number,
|
|
gc_send_group_invite_packet_cb *callback)
|
|
{
|
|
if (!friend_is_valid(c->messenger, friend_number)) {
|
|
return -1;
|
|
}
|
|
|
|
const uint16_t group_name_length = chat->shared_state.group_name_len;
|
|
|
|
assert(group_name_length <= MAX_GC_GROUP_NAME_SIZE);
|
|
|
|
uint8_t *packet = (uint8_t *)malloc(2 + CHAT_ID_SIZE + ENC_PUBLIC_KEY_SIZE + group_name_length);
|
|
|
|
if (packet == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
packet[0] = GP_FRIEND_INVITE;
|
|
packet[1] = GROUP_INVITE;
|
|
|
|
memcpy(packet + 2, get_chat_id(chat->chat_public_key), CHAT_ID_SIZE);
|
|
uint16_t length = 2 + CHAT_ID_SIZE;
|
|
|
|
memcpy(packet + length, chat->self_public_key, ENC_PUBLIC_KEY_SIZE);
|
|
length += ENC_PUBLIC_KEY_SIZE;
|
|
|
|
|
|
memcpy(packet + length, chat->shared_state.group_name, group_name_length);
|
|
length += group_name_length;
|
|
|
|
assert(length <= MAX_GC_PACKET_SIZE);
|
|
|
|
if (!callback(c->messenger, friend_number, packet, length)) {
|
|
free(packet);
|
|
return -2;
|
|
}
|
|
|
|
free(packet);
|
|
|
|
chat->saved_invites[chat->saved_invites_index] = friend_number;
|
|
chat->saved_invites_index = (chat->saved_invites_index + 1) % MAX_GC_SAVED_INVITES;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Sends an invite accepted packet to `friend_number`.
|
|
*
|
|
* Return 0 on success.
|
|
* Return -1 if `friend_number` does not designate a valid friend.
|
|
* Return -2 if `chat `is null.
|
|
* Return -3 if packet failed to send.
|
|
*/
|
|
non_null()
|
|
static int send_gc_invite_accepted_packet(const Messenger *m, const GC_Chat *chat, uint32_t friend_number)
|
|
{
|
|
if (!friend_is_valid(m, friend_number)) {
|
|
return -1;
|
|
}
|
|
|
|
if (chat == nullptr) {
|
|
return -2;
|
|
}
|
|
|
|
uint8_t packet[1 + 1 + CHAT_ID_SIZE + ENC_PUBLIC_KEY_SIZE];
|
|
packet[0] = GP_FRIEND_INVITE;
|
|
packet[1] = GROUP_INVITE_ACCEPTED;
|
|
|
|
memcpy(packet + 2, get_chat_id(chat->chat_public_key), CHAT_ID_SIZE);
|
|
uint16_t length = 2 + CHAT_ID_SIZE;
|
|
|
|
memcpy(packet + length, chat->self_public_key, ENC_PUBLIC_KEY_SIZE);
|
|
length += ENC_PUBLIC_KEY_SIZE;
|
|
|
|
if (!send_group_invite_packet(m, friend_number, packet, length)) {
|
|
LOGGER_ERROR(chat->log, "Failed to send group invite packet.");
|
|
return -3;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** @brief Sends an invite confirmed packet to friend designated by `friend_number`.
|
|
*
|
|
* `data` must contain the group's Chat ID, the sender's public encryption key,
|
|
* and either the sender's packed IP_Port, or at least one packed TCP node that
|
|
* the sender can be connected to through (or both).
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
non_null()
|
|
static bool send_gc_invite_confirmed_packet(const Messenger *m, const GC_Chat *chat, uint32_t friend_number,
|
|
const uint8_t *data, uint16_t length)
|
|
{
|
|
if (!friend_is_valid(m, friend_number)) {
|
|
return false;
|
|
}
|
|
|
|
if (chat == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
if (length > MAX_GC_PACKET_SIZE) {
|
|
return false;
|
|
}
|
|
|
|
const uint16_t packet_length = 2 + length;
|
|
uint8_t *packet = (uint8_t *)malloc(packet_length);
|
|
|
|
if (packet == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
packet[0] = GP_FRIEND_INVITE;
|
|
packet[1] = GROUP_INVITE_CONFIRMATION;
|
|
|
|
memcpy(packet + 2, data, length);
|
|
|
|
if (!send_group_invite_packet(m, friend_number, packet, packet_length)) {
|
|
free(packet);
|
|
return false;
|
|
}
|
|
|
|
free(packet);
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Adds `num_nodes` tcp relays from `tcp_relays` to tcp relays list associated with `gconn`
|
|
*
|
|
* Returns the number of relays successfully added.
|
|
*/
|
|
non_null()
|
|
static uint32_t add_gc_tcp_relays(const GC_Chat *chat, GC_Connection *gconn, const Node_format *tcp_relays,
|
|
size_t num_nodes)
|
|
{
|
|
uint32_t relays_added = 0;
|
|
|
|
for (size_t i = 0; i < num_nodes; ++i) {
|
|
const int add_tcp_result = add_tcp_relay_connection(chat->tcp_conn,
|
|
gconn->tcp_connection_num, &tcp_relays[i].ip_port,
|
|
tcp_relays[i].public_key);
|
|
|
|
if (add_tcp_result == 0) {
|
|
if (gcc_save_tcp_relay(chat->rng, gconn, &tcp_relays[i]) == 0) {
|
|
++relays_added;
|
|
}
|
|
}
|
|
}
|
|
|
|
return relays_added;
|
|
}
|
|
|
|
non_null()
|
|
static bool copy_friend_ip_port_to_gconn(const Messenger *m, int friend_number, GC_Connection *gconn)
|
|
{
|
|
if (!friend_is_valid(m, friend_number)) {
|
|
return false;
|
|
}
|
|
|
|
const Friend *f = &m->friendlist[friend_number];
|
|
const int friend_connection_id = f->friendcon_id;
|
|
const Friend_Conn *connection = get_conn(m->fr_c, friend_connection_id);
|
|
|
|
if (connection == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
const IP_Port *friend_ip_port = friend_conn_get_dht_ip_port(connection);
|
|
|
|
if (!ipport_isset(friend_ip_port)) {
|
|
return false;
|
|
}
|
|
|
|
gconn->addr.ip_port = *friend_ip_port;
|
|
|
|
return true;
|
|
}
|
|
|
|
int handle_gc_invite_confirmed_packet(const GC_Session *c, int friend_number, const uint8_t *data, uint16_t length)
|
|
{
|
|
if (length < GC_JOIN_DATA_LENGTH) {
|
|
return -1;
|
|
}
|
|
|
|
if (!friend_is_valid(c->messenger, friend_number)) {
|
|
return -4;
|
|
}
|
|
|
|
uint8_t chat_id[CHAT_ID_SIZE];
|
|
uint8_t invite_chat_pk[ENC_PUBLIC_KEY_SIZE];
|
|
|
|
memcpy(chat_id, data, CHAT_ID_SIZE);
|
|
memcpy(invite_chat_pk, data + CHAT_ID_SIZE, ENC_PUBLIC_KEY_SIZE);
|
|
|
|
const GC_Chat *chat = gc_get_group_by_public_key(c, chat_id);
|
|
|
|
if (chat == nullptr) {
|
|
return -2;
|
|
}
|
|
|
|
const int peer_number = get_peer_number_of_enc_pk(chat, invite_chat_pk, false);
|
|
|
|
GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
return -3;
|
|
}
|
|
|
|
Node_format tcp_relays[GCC_MAX_TCP_SHARED_RELAYS];
|
|
const int num_nodes = unpack_nodes(tcp_relays, GCC_MAX_TCP_SHARED_RELAYS,
|
|
nullptr, data + ENC_PUBLIC_KEY_SIZE + CHAT_ID_SIZE,
|
|
length - GC_JOIN_DATA_LENGTH, true);
|
|
|
|
const bool copy_ip_port_result = copy_friend_ip_port_to_gconn(c->messenger, friend_number, gconn);
|
|
|
|
uint32_t tcp_relays_added = 0;
|
|
|
|
if (num_nodes > 0) {
|
|
tcp_relays_added = add_gc_tcp_relays(chat, gconn, tcp_relays, num_nodes);
|
|
} else {
|
|
LOGGER_WARNING(chat->log, "Invite confirm packet did not contain any TCP relays");
|
|
}
|
|
|
|
if (tcp_relays_added == 0 && !copy_ip_port_result) {
|
|
LOGGER_ERROR(chat->log, "Got invalid connection info from peer");
|
|
return -5;
|
|
}
|
|
|
|
gconn->pending_handshake_type = HS_INVITE_REQUEST;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** Return true if we have a pending sent invite for our friend designated by `friend_number`. */
|
|
non_null()
|
|
static bool friend_was_invited(const Messenger *m, GC_Chat *chat, int friend_number)
|
|
{
|
|
for (size_t i = 0; i < MAX_GC_SAVED_INVITES; ++i) {
|
|
if (chat->saved_invites[i] == friend_number) {
|
|
chat->saved_invites[i] = -1;
|
|
return friend_is_valid(m, friend_number);
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool handle_gc_invite_accepted_packet(const GC_Session *c, int friend_number, const uint8_t *data, uint16_t length)
|
|
{
|
|
if (length < GC_JOIN_DATA_LENGTH) {
|
|
return false;
|
|
}
|
|
|
|
const Messenger *m = c->messenger;
|
|
|
|
const uint8_t *chat_id = data;
|
|
|
|
GC_Chat *chat = gc_get_group_by_public_key(c, chat_id);
|
|
|
|
if (chat == nullptr || !group_can_handle_packets(chat)) {
|
|
return false;
|
|
}
|
|
|
|
const uint8_t *invite_chat_pk = data + CHAT_ID_SIZE;
|
|
|
|
const int peer_number = peer_add(chat, nullptr, invite_chat_pk);
|
|
|
|
if (!friend_was_invited(m, chat, friend_number)) {
|
|
return false;
|
|
}
|
|
|
|
GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
Node_format tcp_relays[GCC_MAX_TCP_SHARED_RELAYS];
|
|
const uint32_t num_tcp_relays = tcp_copy_connected_relays(chat->tcp_conn, tcp_relays, GCC_MAX_TCP_SHARED_RELAYS);
|
|
|
|
const bool copy_ip_port_result = copy_friend_ip_port_to_gconn(m, friend_number, gconn);
|
|
|
|
if (num_tcp_relays == 0 && !copy_ip_port_result) {
|
|
return false;
|
|
}
|
|
|
|
uint16_t len = GC_JOIN_DATA_LENGTH;
|
|
uint8_t out_data[GC_JOIN_DATA_LENGTH + (GCC_MAX_TCP_SHARED_RELAYS * PACKED_NODE_SIZE_IP6)];
|
|
|
|
memcpy(out_data, chat_id, CHAT_ID_SIZE);
|
|
memcpy(out_data + CHAT_ID_SIZE, chat->self_public_key, ENC_PUBLIC_KEY_SIZE);
|
|
|
|
if (num_tcp_relays > 0) {
|
|
const uint32_t tcp_relays_added = add_gc_tcp_relays(chat, gconn, tcp_relays, num_tcp_relays);
|
|
|
|
if (tcp_relays_added == 0 && !copy_ip_port_result) {
|
|
LOGGER_ERROR(chat->log, "Got invalid connection info from peer");
|
|
return false;
|
|
}
|
|
|
|
const int nodes_len = pack_nodes(chat->log, out_data + len, sizeof(out_data) - len, tcp_relays,
|
|
(uint16_t)num_tcp_relays);
|
|
|
|
if (nodes_len <= 0 && !copy_ip_port_result) {
|
|
return false;
|
|
}
|
|
|
|
len += nodes_len;
|
|
}
|
|
|
|
return send_gc_invite_confirmed_packet(m, chat, friend_number, out_data, len);
|
|
}
|
|
|
|
int gc_accept_invite(GC_Session *c, int32_t friend_number, const uint8_t *data, uint16_t length, const uint8_t *nick,
|
|
size_t nick_length, const uint8_t *passwd, uint16_t passwd_len)
|
|
{
|
|
if (length < CHAT_ID_SIZE + ENC_PUBLIC_KEY_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
if (nick_length > MAX_GC_NICK_SIZE) {
|
|
return -3;
|
|
}
|
|
|
|
if (nick == nullptr || nick_length == 0) {
|
|
return -4;
|
|
}
|
|
|
|
if (!friend_is_valid(c->messenger, friend_number)) {
|
|
return -6;
|
|
}
|
|
|
|
const uint8_t *chat_id = data;
|
|
const uint8_t *invite_chat_pk = data + CHAT_ID_SIZE;
|
|
|
|
const int group_number = create_new_group(c, nick, nick_length, false, GI_PUBLIC);
|
|
|
|
if (group_number == -1) {
|
|
return -2;
|
|
}
|
|
|
|
GC_Chat *chat = gc_get_group(c, group_number);
|
|
|
|
if (chat == nullptr) {
|
|
return -2;
|
|
}
|
|
|
|
if (!expand_chat_id(chat->chat_public_key, chat_id)) {
|
|
group_delete(c, chat);
|
|
return -2;
|
|
}
|
|
|
|
if (passwd != nullptr && passwd_len > 0) {
|
|
if (!set_gc_password_local(chat, passwd, passwd_len)) {
|
|
group_delete(c, chat);
|
|
return -5;
|
|
}
|
|
}
|
|
|
|
const int peer_id = peer_add(chat, nullptr, invite_chat_pk);
|
|
|
|
if (peer_id < 0) {
|
|
return -2;
|
|
}
|
|
|
|
chat->join_type = HJ_PRIVATE;
|
|
|
|
if (send_gc_invite_accepted_packet(c->messenger, chat, friend_number) != 0) {
|
|
return -7;
|
|
}
|
|
|
|
return group_number;
|
|
}
|
|
|
|
non_null(1, 3) nullable(5)
|
|
static bool gc_handle_announce_response_callback(Onion_Client *onion_c, uint32_t sendback_num, const uint8_t *data,
|
|
size_t data_length, void *user_data);
|
|
|
|
GC_Session *new_dht_groupchats(Messenger *m)
|
|
{
|
|
if (m == nullptr) {
|
|
return nullptr;
|
|
}
|
|
|
|
GC_Session *c = (GC_Session *)calloc(1, sizeof(GC_Session));
|
|
|
|
if (c == nullptr) {
|
|
return nullptr;
|
|
}
|
|
|
|
c->messenger = m;
|
|
c->announces_list = m->group_announce;
|
|
|
|
networking_registerhandler(m->net, NET_PACKET_GC_LOSSLESS, &handle_gc_udp_packet, m);
|
|
networking_registerhandler(m->net, NET_PACKET_GC_LOSSY, &handle_gc_udp_packet, m);
|
|
networking_registerhandler(m->net, NET_PACKET_GC_HANDSHAKE, &handle_gc_udp_packet, m);
|
|
onion_group_announce_register(m->onion_c, gc_handle_announce_response_callback, c);
|
|
|
|
return c;
|
|
}
|
|
|
|
static void group_cleanup(GC_Session *c, GC_Chat *chat)
|
|
{
|
|
kill_group_friend_connection(c, chat);
|
|
|
|
mod_list_cleanup(&chat->moderation);
|
|
sanctions_list_cleanup(&chat->moderation);
|
|
|
|
if (chat->tcp_conn != nullptr) {
|
|
kill_tcp_connections(chat->tcp_conn);
|
|
}
|
|
|
|
gcc_cleanup(chat);
|
|
|
|
if (chat->group != nullptr) {
|
|
free(chat->group);
|
|
chat->group = nullptr;
|
|
}
|
|
|
|
crypto_memunlock(chat->self_secret_key, sizeof(chat->self_secret_key));
|
|
crypto_memunlock(chat->chat_secret_key, sizeof(chat->chat_secret_key));
|
|
crypto_memunlock(chat->shared_state.password, sizeof(chat->shared_state.password));
|
|
}
|
|
|
|
/** Deletes chat from group chat array and cleans up. */
|
|
static void group_delete(GC_Session *c, GC_Chat *chat)
|
|
{
|
|
if (c == nullptr || chat == nullptr) {
|
|
if (chat != nullptr) {
|
|
LOGGER_ERROR(chat->log, "Null pointer");
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
group_cleanup(c, chat);
|
|
|
|
c->chats[chat->group_number] = empty_gc_chat;
|
|
|
|
uint32_t i;
|
|
|
|
for (i = c->chats_index; i > 0; --i) {
|
|
if (c->chats[i - 1].connection_state != CS_NONE) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (c->chats_index != i) {
|
|
c->chats_index = i;
|
|
|
|
if (!realloc_groupchats(c, c->chats_index)) {
|
|
LOGGER_ERROR(chat->log, "Failed to reallocate groupchats array");
|
|
}
|
|
}
|
|
}
|
|
|
|
int gc_group_exit(GC_Session *c, GC_Chat *chat, const uint8_t *message, uint16_t length)
|
|
{
|
|
const int ret = group_can_handle_packets(chat) ? send_gc_self_exit(chat, message, length) : 0;
|
|
group_delete(c, chat);
|
|
return ret;
|
|
}
|
|
|
|
void kill_dht_groupchats(GC_Session *c)
|
|
{
|
|
if (c == nullptr) {
|
|
return;
|
|
}
|
|
|
|
for (uint32_t i = 0; i < c->chats_index; ++i) {
|
|
GC_Chat *chat = &c->chats[i];
|
|
|
|
if (chat->connection_state == CS_NONE) {
|
|
continue;
|
|
}
|
|
|
|
if (group_can_handle_packets(chat)) {
|
|
send_gc_self_exit(chat, nullptr, 0);
|
|
}
|
|
|
|
group_cleanup(c, chat);
|
|
}
|
|
|
|
networking_registerhandler(c->messenger->net, NET_PACKET_GC_LOSSY, nullptr, nullptr);
|
|
networking_registerhandler(c->messenger->net, NET_PACKET_GC_LOSSLESS, nullptr, nullptr);
|
|
networking_registerhandler(c->messenger->net, NET_PACKET_GC_HANDSHAKE, nullptr, nullptr);
|
|
onion_group_announce_register(c->messenger->onion_c, nullptr, nullptr);
|
|
|
|
free(c->chats);
|
|
free(c);
|
|
}
|
|
|
|
bool gc_group_is_valid(const GC_Chat *chat)
|
|
{
|
|
return chat->connection_state != CS_NONE && chat->shared_state.version > 0;
|
|
}
|
|
|
|
/** Return true if `group_number` designates an active group in session `c`. */
|
|
static bool group_number_valid(const GC_Session *c, int group_number)
|
|
{
|
|
if (group_number < 0 || group_number >= c->chats_index) {
|
|
return false;
|
|
}
|
|
|
|
if (c->chats == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
return c->chats[group_number].connection_state != CS_NONE;
|
|
}
|
|
|
|
uint32_t gc_count_groups(const GC_Session *c)
|
|
{
|
|
uint32_t count = 0;
|
|
|
|
for (uint32_t i = 0; i < c->chats_index; ++i) {
|
|
const GC_Chat *chat = &c->chats[i];
|
|
|
|
if (gc_group_is_valid(chat)) {
|
|
++count;
|
|
}
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
GC_Chat *gc_get_group(const GC_Session *c, int group_number)
|
|
{
|
|
if (!group_number_valid(c, group_number)) {
|
|
return nullptr;
|
|
}
|
|
|
|
return &c->chats[group_number];
|
|
}
|
|
|
|
GC_Chat *gc_get_group_by_public_key(const GC_Session *c, const uint8_t *public_key)
|
|
{
|
|
for (uint32_t i = 0; i < c->chats_index; ++i) {
|
|
GC_Chat *chat = &c->chats[i];
|
|
|
|
if (chat->connection_state == CS_NONE) {
|
|
continue;
|
|
}
|
|
|
|
if (memcmp(public_key, get_chat_id(chat->chat_public_key), CHAT_ID_SIZE) == 0) {
|
|
return chat;
|
|
}
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
/** Return True if chat_id exists in the session chat array */
|
|
static bool group_exists(const GC_Session *c, const uint8_t *chat_id)
|
|
{
|
|
for (uint32_t i = 0; i < c->chats_index; ++i) {
|
|
const GC_Chat *chat = &c->chats[i];
|
|
|
|
if (chat->connection_state == CS_NONE) {
|
|
continue;
|
|
}
|
|
|
|
if (memcmp(get_chat_id(chat->chat_public_key), chat_id, CHAT_ID_SIZE) == 0) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/** Creates a new 32-byte session encryption keypair and puts the results in `public_key` and `secret_key`. */
|
|
static void create_gc_session_keypair(const Logger *log, const Random *rng, uint8_t *public_key, uint8_t *secret_key)
|
|
{
|
|
if (crypto_new_keypair(rng, public_key, secret_key) != 0) {
|
|
LOGGER_FATAL(log, "Failed to create group session keypair");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Creates a new 64-byte extended keypair for `chat` and puts results in `self_public_key`
|
|
* and `self_secret_key` buffers. The first 32-bytes of the generated keys are used for
|
|
* encryption, while the remaining 32-bytes are used for signing.
|
|
*
|
|
* Return false if key generation fails.
|
|
*/
|
|
non_null()
|
|
static bool create_new_chat_ext_keypair(GC_Chat *chat)
|
|
{
|
|
crypto_memlock(chat->self_secret_key, sizeof(chat->self_secret_key));
|
|
|
|
if (!create_extended_keypair(chat->self_public_key, chat->self_secret_key)) {
|
|
crypto_memunlock(chat->self_secret_key, sizeof(chat->self_secret_key));
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/** @brief Handles a group announce onion response.
|
|
*
|
|
* Return true on success.
|
|
*/
|
|
static bool gc_handle_announce_response_callback(Onion_Client *onion_c, uint32_t sendback_num, const uint8_t *data,
|
|
size_t data_length, void *user_data)
|
|
{
|
|
const GC_Session *c = (GC_Session *)user_data;
|
|
|
|
if (c == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
if (sendback_num == 0) {
|
|
return false;
|
|
}
|
|
|
|
GC_Announce announces[GCA_MAX_SENT_ANNOUNCES];
|
|
const uint8_t *gc_public_key = onion_friend_get_gc_public_key_num(onion_c, sendback_num - 1);
|
|
GC_Chat *chat = gc_get_group_by_public_key(c, gc_public_key);
|
|
|
|
if (chat == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
const int gc_announces_count = gca_unpack_announces_list(chat->log, data, data_length,
|
|
announces, GCA_MAX_SENT_ANNOUNCES);
|
|
|
|
if (gc_announces_count == -1) {
|
|
return false;
|
|
}
|
|
|
|
const int added_peers = gc_add_peers_from_announces(chat, announces, gc_announces_count);
|
|
|
|
return added_peers >= 0;
|
|
}
|
|
|
|
/** @brief Adds TCP relays from `announce` to the TCP relays list for `gconn`.
|
|
*
|
|
* Returns the number of relays successfully added.
|
|
*/
|
|
non_null()
|
|
static uint32_t add_gc_tcp_relays_from_announce(const GC_Chat *chat, GC_Connection *gconn, const GC_Announce *announce)
|
|
{
|
|
uint32_t added_relays = 0;
|
|
|
|
for (uint8_t j = 0; j < announce->tcp_relays_count; ++j) {
|
|
const int add_tcp_result = add_tcp_relay_connection(chat->tcp_conn, gconn->tcp_connection_num,
|
|
&announce->tcp_relays[j].ip_port,
|
|
announce->tcp_relays[j].public_key);
|
|
|
|
if (add_tcp_result == -1) {
|
|
continue;
|
|
}
|
|
|
|
if (gcc_save_tcp_relay(chat->rng, gconn, &announce->tcp_relays[j]) == -1) {
|
|
continue;
|
|
}
|
|
|
|
if (added_relays == 0) {
|
|
memcpy(gconn->oob_relay_pk, announce->tcp_relays[j].public_key, CRYPTO_PUBLIC_KEY_SIZE);
|
|
}
|
|
|
|
++added_relays;
|
|
}
|
|
|
|
return added_relays;
|
|
}
|
|
|
|
int gc_add_peers_from_announces(GC_Chat *chat, const GC_Announce *announces, uint8_t gc_announces_count)
|
|
{
|
|
if (chat == nullptr || announces == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
if (!is_public_chat(chat)) {
|
|
return 0;
|
|
}
|
|
|
|
int added_peers = 0;
|
|
|
|
for (uint8_t i = 0; i < gc_announces_count; ++i) {
|
|
const GC_Announce *announce = &announces[i];
|
|
|
|
if (!gca_is_valid_announce(announce)) {
|
|
continue;
|
|
}
|
|
|
|
const bool ip_port_set = announce->ip_port_is_set;
|
|
const IP_Port *ip_port = ip_port_set ? &announce->ip_port : nullptr;
|
|
const int peer_number = peer_add(chat, ip_port, announce->peer_public_key);
|
|
|
|
GC_Connection *gconn = get_gc_connection(chat, peer_number);
|
|
|
|
if (gconn == nullptr) {
|
|
continue;
|
|
}
|
|
|
|
const uint32_t added_tcp_relays = add_gc_tcp_relays_from_announce(chat, gconn, announce);
|
|
|
|
if (!ip_port_set && added_tcp_relays == 0) {
|
|
LOGGER_ERROR(chat->log, "Got invalid announcement: %u relays, IPP set: %d",
|
|
added_tcp_relays, ip_port_set);
|
|
continue;
|
|
}
|
|
|
|
gconn->pending_handshake_type = HS_INVITE_REQUEST;
|
|
|
|
if (!ip_port_set) {
|
|
gconn->is_oob_handshake = true;
|
|
}
|
|
|
|
++added_peers;
|
|
}
|
|
|
|
return added_peers;
|
|
}
|
|
#endif // VANILLA_NACL
|