88 lines
4.2 KiB
PHP
88 lines
4.2 KiB
PHP
<?php
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/**
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* SeqNoHandler module.
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*
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* This file is part of MadelineProto.
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* MadelineProto is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
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* MadelineProto is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Affero General Public License for more details.
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* You should have received a copy of the GNU General Public License along with MadelineProto.
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* If not, see <http://www.gnu.org/licenses/>.
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*
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* @author Daniil Gentili <daniil@daniil.it>
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* @copyright 2016-2020 Daniil Gentili <daniil@daniil.it>
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* @license https://opensource.org/licenses/AGPL-3.0 AGPLv3
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*
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* @link https://docs.madelineproto.xyz MadelineProto documentation
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*/
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namespace danog\MadelineProto\SecretChats;
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use danog\MadelineProto\Logger;
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/**
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* Manages sequence numbers.
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*/
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trait SeqNoHandler
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{
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private function checkSecretInSeqNo($chat_id, $seqno): \Generator
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{
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$seqno = ($seqno - $this->secret_chats[$chat_id]['out_seq_no_x']) / 2;
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$last = 0;
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foreach ($this->secret_chats[$chat_id]['incoming'] as $message) {
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if (isset($message['decrypted_message']['in_seq_no'])) {
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if (($message['decrypted_message']['in_seq_no'] - $this->secret_chats[$chat_id]['out_seq_no_x']) / 2 < $last) {
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$this->logger->logger("Discarding secret chat $chat_id, in_seq_no is not increasing", Logger::LEVEL_FATAL);
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yield from $this->discardSecretChat($chat_id);
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throw new \danog\MadelineProto\SecurityException('in_seq_no is not increasing');
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}
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$last = ($message['decrypted_message']['in_seq_no'] - $this->secret_chats[$chat_id]['out_seq_no_x']) / 2;
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}
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}
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if ($seqno > $this->secret_chats[$chat_id]['out_seq_no'] + 1) {
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$this->logger->logger("Discarding secret chat $chat_id, in_seq_no is too big", Logger::LEVEL_FATAL);
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yield from $this->discardSecretChat($chat_id);
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throw new \danog\MadelineProto\SecurityException('in_seq_no is too big');
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}
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return true;
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}
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private function checkSecretOutSeqNo($chat_id, $seqno): \Generator
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{
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$seqno = ($seqno - $this->secret_chats[$chat_id]['in_seq_no_x']) / 2;
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$C = 0;
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foreach ($this->secret_chats[$chat_id]['incoming'] as $message) {
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if (isset($message['decrypted_message']['out_seq_no']) && $C < $this->secret_chats[$chat_id]['in_seq_no']) {
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$temp = ($message['decrypted_message']['out_seq_no'] - $this->secret_chats[$chat_id]['in_seq_no_x']) / 2;
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if ($temp !== $C) {
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$this->logger->logger("Discarding secret chat $chat_id, out_seq_no hole: should be $C, is $temp", Logger::LEVEL_FATAL);
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yield from $this->discardSecretChat($chat_id);
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throw new \danog\MadelineProto\SecurityException("out_seq_no hole: should be $C, is $temp");
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}
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$C++;
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}
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}
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//$this->logger->logger($C, $seqno);
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if ($seqno < $C) {
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// <= C
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$this->logger->logger('WARNING: dropping repeated message with seqno '.$seqno);
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return false;
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}
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if ($seqno > $C) {
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// > C+1
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$this->logger->logger("Discarding secret chat $chat_id, out_seq_no gap detected: ($seqno > $C)", Logger::LEVEL_FATAL);
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yield from $this->discardSecretChat($chat_id);
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throw new \danog\MadelineProto\SecurityException('WARNING: out_seq_no gap detected ('.$seqno.' > '.$C.')!');
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}
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return true;
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}
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private function generateSecretInSeqNo($chat)
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{
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return $this->secret_chats[$chat]['layer'] > 8 ? $this->secret_chats[$chat]['in_seq_no'] * 2 + $this->secret_chats[$chat]['in_seq_no_x'] : -1;
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}
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private function generateSecretOutSeqNo($chat)
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{
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return $this->secret_chats[$chat]['layer'] > 8 ? $this->secret_chats[$chat]['out_seq_no'] * 2 + $this->secret_chats[$chat]['out_seq_no_x'] : -1;
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}
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}
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