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MadelineProto/src/VoIP/AuthKeyHandler.php

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<?php
declare(strict_types=1);
/**
* AuthKeyHandler module.
*
* This file is part of MadelineProto.
* 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.
* 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.
* See the GNU Affero General Public License for more details.
* You should have received a copy of the GNU General Public License along with MadelineProto.
* If not, see <http://www.gnu.org/licenses/>.
*
* @author Daniil Gentili <daniil@daniil.it>
* @copyright 2016-2023 Daniil Gentili <daniil@daniil.it>
* @license https://opensource.org/licenses/AGPL-3.0 AGPLv3
* @link https://docs.madelineproto.xyz MadelineProto documentation
*/
namespace danog\MadelineProto\VoIP;
use danog\MadelineProto\Exception;
use danog\MadelineProto\Lang;
use danog\MadelineProto\Logger;
use danog\MadelineProto\Loop\Update\UpdateLoop;
use danog\MadelineProto\Magic;
use danog\MadelineProto\MTProtoTools\Crypt;
use danog\MadelineProto\RPCErrorException;
use danog\MadelineProto\SecurityException;
use danog\MadelineProto\VoIP;
use phpseclib3\Math\BigInteger;
use const STR_PAD_LEFT;
/**
* Manages the creation of the authorization key.
*
* https://core.telegram.org/mtproto/auth_key
* https://core.telegram.org/mtproto/samples-auth_key
*
* @internal
*/
trait AuthKeyHandler
{
private array $calls = [];
/**
* Accept call from VoIP instance.
*
* @param VoIP $instance Call instance
* @param array $user User
* @internal
*/
public function acceptCallFrom(VoIP $instance, array $user): ?VoIP
{
if (!$this->acceptCall($user)) {
$instance->discard();
return null;
}
return $instance;
}
/**
* @param VoIP $instance Call instance
* @param array $call Call info
* @param array $reason Discard reason
* @param array $rating Rating
* @param boolean $need_debug Needs debug?
* @internal
*/
public function discardCallFrom(VoIP $instance, array $call, array $reason, array $rating = [], bool $need_debug = true): VoIP
{
$this->discardCall($call, $reason, $rating, $need_debug);
return $instance;
}
/**
* Request VoIP call.
*
* @param mixed $user User
*/
public function requestCall(mixed $user)
{
if (!\class_exists('\\danog\\MadelineProto\\VoIP')) {
throw Exception::extension('libtgvoip');
}
$user = ($this->getInfo($user));
if (!isset($user['InputUser']) || $user['InputUser']['_'] === 'inputUserSelf') {
throw new Exception(Lang::$current_lang['peer_not_in_db']);
}
$user = $user['InputUser'];
$this->logger->logger(\sprintf('Calling %s...', $user['user_id']), Logger::VERBOSE);
$dh_config = ($this->getDhConfig());
$this->logger->logger('Generating a...', Logger::VERBOSE);
$a = BigInteger::randomRange(Magic::$two, $dh_config['p']->subtract(Magic::$two));
$this->logger->logger('Generating g_a...', Logger::VERBOSE);
$g_a = $dh_config['g']->powMod($a, $dh_config['p']);
Crypt::checkG($g_a, $dh_config['p']);
$controller = new VoIP(true, $user['user_id'], $this, VoIP::CALL_STATE_REQUESTED);
$controller->storage = ['a' => $a, 'g_a' => \str_pad($g_a->toBytes(), 256, \chr(0), STR_PAD_LEFT)];
$res = $this->methodCallAsyncRead('phone.requestCall', ['user_id' => $user, 'g_a_hash' => \hash('sha256', $g_a->toBytes(), true), 'protocol' => ['_' => 'phoneCallProtocol', 'udp_p2p' => true, 'udp_reflector' => true, 'min_layer' => 65, 'max_layer' => VoIP::getConnectionMaxLayer()]]);
$controller->setCall($res['phone_call']);
$this->calls[$res['phone_call']['id']] = $controller;
$this->updaters[UpdateLoop::GENERIC]->resume();
return $controller;
}
/**
* Accept call.
*
* @param array $call Call
*/
public function acceptCall(array $call): bool
{
if (!\class_exists('\\danog\\MadelineProto\\VoIP')) {
throw new Exception();
}
if ($this->callStatus($call['id']) !== VoIP::CALL_STATE_ACCEPTED) {
$this->logger->logger(\sprintf(Lang::$current_lang['call_error_1'], $call['id']));
return false;
}
$this->logger->logger(\sprintf(Lang::$current_lang['accepting_call'], $this->calls[$call['id']]->getOtherID()), Logger::VERBOSE);
$dh_config = ($this->getDhConfig());
$this->logger->logger('Generating b...', Logger::VERBOSE);
$b = BigInteger::randomRange(Magic::$two, $dh_config['p']->subtract(Magic::$two));
$g_b = $dh_config['g']->powMod($b, $dh_config['p']);
Crypt::checkG($g_b, $dh_config['p']);
try {
$res = $this->methodCallAsyncRead('phone.acceptCall', ['peer' => ['id' => $call['id'], 'access_hash' => $call['access_hash'], '_' => 'inputPhoneCall'], 'g_b' => $g_b->toBytes(), 'protocol' => ['_' => 'phoneCallProtocol', 'udp_reflector' => true, 'udp_p2p' => true, 'min_layer' => 65, 'max_layer' => VoIP::getConnectionMaxLayer()]]);
} catch (RPCErrorException $e) {
if ($e->rpc === 'CALL_ALREADY_ACCEPTED') {
$this->logger->logger(\sprintf(Lang::$current_lang['call_already_accepted'], $call['id']));
return true;
}
if ($e->rpc === 'CALL_ALREADY_DECLINED') {
$this->logger->logger(Lang::$current_lang['call_already_declined']);
$this->discardCall($call['id'], ['_' => 'phoneCallDiscardReasonHangup']);
return false;
}
throw $e;
}
$this->calls[$res['phone_call']['id']]->storage['b'] = $b;
$this->updaters[UpdateLoop::GENERIC]->resume();
return true;
}
/**
* Confirm call.
*
* @param array $params Params
*/
public function confirmCall(array $params)
{
if (!\class_exists('\\danog\\MadelineProto\\VoIP')) {
throw Exception::extension('libtgvoip');
}
if ($this->callStatus($params['id']) !== VoIP::CALL_STATE_REQUESTED) {
$this->logger->logger(\sprintf(Lang::$current_lang['call_error_2'], $params['id']));
return false;
}
$this->logger->logger(\sprintf(Lang::$current_lang['call_confirming'], $this->calls[$params['id']]->getOtherID()), Logger::VERBOSE);
$dh_config = ($this->getDhConfig());
$params['g_b'] = new BigInteger((string) $params['g_b'], 256);
Crypt::checkG($params['g_b'], $dh_config['p']);
$key = \str_pad($params['g_b']->powMod($this->calls[$params['id']]->storage['a'], $dh_config['p'])->toBytes(), 256, \chr(0), STR_PAD_LEFT);
try {
$res = ($this->methodCallAsyncRead('phone.confirmCall', ['key_fingerprint' => \substr(\sha1($key, true), -8), 'peer' => ['id' => $params['id'], 'access_hash' => $params['access_hash'], '_' => 'inputPhoneCall'], 'g_a' => $this->calls[$params['id']]->storage['g_a'], 'protocol' => ['_' => 'phoneCallProtocol', 'udp_reflector' => true, 'min_layer' => 65, 'max_layer' => VoIP::getConnectionMaxLayer()]]))['phone_call'];
} catch (RPCErrorException $e) {
if ($e->rpc === 'CALL_ALREADY_ACCEPTED') {
$this->logger->logger(\sprintf(Lang::$current_lang['call_already_accepted'], $params['id']));
return true;
}
if ($e->rpc === 'CALL_ALREADY_DECLINED') {
$this->logger->logger(Lang::$current_lang['call_already_declined']);
$this->discardCall($params['id'], ['_' => 'phoneCallDiscardReasonHangup']);
return false;
}
throw $e;
}
$this->calls[$params['id']]->setCall($res);
$visualization = [];
$length = new BigInteger(\count(Magic::$emojis));
foreach (\str_split(\hash('sha256', $key.\str_pad($this->calls[$params['id']]->storage['g_a'], 256, \chr(0), STR_PAD_LEFT), true), 8) as $number) {
$number[0] = \chr(\ord($number[0]) & 0x7f);
$visualization[] = Magic::$emojis[(int) (new BigInteger($number, 256))->divide($length)[1]->toString()];
}
$this->calls[$params['id']]->setVisualization($visualization);
$this->calls[$params['id']]->configuration['endpoints'] = \array_merge($res['connections'], $this->calls[$params['id']]->configuration['endpoints']);
$this->calls[$params['id']]->configuration = \array_merge(['recv_timeout' => $this->config['call_receive_timeout_ms'] / 1000, 'init_timeout' => $this->config['call_connect_timeout_ms'] / 1000, 'data_saving' => VoIP::DATA_SAVING_NEVER, 'enable_NS' => true, 'enable_AEC' => true, 'enable_AGC' => true, 'auth_key' => $key, 'auth_key_id' => \substr(\sha1($key, true), -8), 'call_id' => \substr(\hash('sha256', $key, true), -16), 'network_type' => VoIP::NET_TYPE_ETHERNET], $this->calls[$params['id']]->configuration);
$this->calls[$params['id']]->parseConfig();
return $this->calls[$params['id']]->startTheMagic();
}
/**
* Complete call handshake.
*
* @param array $params Params
*/
public function completeCall(array $params)
{
if (!\class_exists('\\danog\\MadelineProto\\VoIP')) {
throw Exception::extension('libtgvoip');
}
if ($this->callStatus($params['id']) !== VoIP::CALL_STATE_ACCEPTED || !isset($this->calls[$params['id']]->storage['b'])) {
$this->logger->logger(\sprintf(Lang::$current_lang['call_error_3'], $params['id']));
return false;
}
$this->logger->logger(\sprintf(Lang::$current_lang['call_completing'], $this->calls[$params['id']]->getOtherID()), Logger::VERBOSE);
$dh_config = ($this->getDhConfig());
if (\hash('sha256', $params['g_a_or_b'], true) != $this->calls[$params['id']]->storage['g_a_hash']) {
throw new SecurityException('Invalid g_a!');
}
$params['g_a_or_b'] = new BigInteger((string) $params['g_a_or_b'], 256);
Crypt::checkG($params['g_a_or_b'], $dh_config['p']);
$key = \str_pad($params['g_a_or_b']->powMod($this->calls[$params['id']]->storage['b'], $dh_config['p'])->toBytes(), 256, \chr(0), STR_PAD_LEFT);
if (\substr(\sha1($key, true), -8) != $params['key_fingerprint']) {
throw new SecurityException(Lang::$current_lang['fingerprint_invalid']);
}
$visualization = [];
$length = new BigInteger(\count(Magic::$emojis));
foreach (\str_split(\hash('sha256', $key.\str_pad($params['g_a_or_b']->toBytes(), 256, \chr(0), STR_PAD_LEFT), true), 8) as $number) {
$number[0] = \chr(\ord($number[0]) & 0x7f);
$visualization[] = Magic::$emojis[(int) (new BigInteger($number, 256))->divide($length)[1]->toString()];
}
$this->calls[$params['id']]->setVisualization($visualization);
$this->calls[$params['id']]->configuration['endpoints'] = \array_merge($params['connections'], $this->calls[$params['id']]->configuration['endpoints']);
$this->calls[$params['id']]->configuration = \array_merge(['recv_timeout' => $this->config['call_receive_timeout_ms'] / 1000, 'init_timeout' => $this->config['call_connect_timeout_ms'] / 1000, 'data_saving' => VoIP::DATA_SAVING_NEVER, 'enable_NS' => true, 'enable_AEC' => true, 'enable_AGC' => true, 'auth_key' => $key, 'auth_key_id' => \substr(\sha1($key, true), -8), 'call_id' => \substr(\hash('sha256', $key, true), -16), 'network_type' => VoIP::NET_TYPE_ETHERNET], $this->calls[$params['id']]->configuration);
$this->calls[$params['id']]->parseConfig();
return $this->calls[$params['id']]->startTheMagic();
}
/**
* Get call status.
*
* @param int $id Call ID
*/
public function callStatus(int $id): int
{
if (!\class_exists('\\danog\\MadelineProto\\VoIP')) {
throw Exception::extension('libtgvoip');
}
if (isset($this->calls[$id])) {
return $this->calls[$id]->getCallState();
}
return VoIP::CALL_STATE_NONE;
}
/**
* Get call info.
*
* @param int $call Call ID
*/
public function getCall(int $call): array
{
if (!\class_exists('\\danog\\MadelineProto\\VoIP')) {
throw Exception::extension('libtgvoip');
}
return $this->calls[$call];
}
/**
* Discard call.
*
* @param array $call Call
* @param array $rating Rating
* @param boolean $need_debug Need debug?
*/
public function discardCall(array $call, array $reason, array $rating = [], bool $need_debug = true): ?VoIP
{
if (!\class_exists('\\danog\\MadelineProto\\VoIP')) {
throw Exception::extension('libtgvoip');
}
if (!isset($this->calls[$call['id']])) {
return null;
}
$this->logger->logger(\sprintf(Lang::$current_lang['call_discarding'], $call['id']), Logger::VERBOSE);
try {
$res = $this->methodCallAsyncRead('phone.discardCall', ['peer' => $call, 'duration' => \time() - $this->calls[$call['id']]->whenCreated(), 'connection_id' => $this->calls[$call['id']]->getPreferredRelayID(), 'reason' => $reason]);
} catch (RPCErrorException $e) {
if (!\in_array($e->rpc, ['CALL_ALREADY_DECLINED', 'CALL_ALREADY_ACCEPTED'])) {
throw $e;
}
}
if (!empty($rating)) {
$this->logger->logger(\sprintf('Setting rating for call %s...', $call['id']), Logger::VERBOSE);
$this->methodCallAsyncRead('phone.setCallRating', ['peer' => $call, 'rating' => $rating['rating'], 'comment' => $rating['comment']]);
}
if ($need_debug && isset($this->calls[$call['id']])) {
$this->logger->logger(\sprintf('Saving debug data for call %s...', $call['id']), Logger::VERBOSE);
$this->methodCallAsyncRead('phone.saveCallDebug', ['peer' => $call, 'debug' => $this->calls[$call['id']]->getDebugLog()]);
}
$c = $this->calls[$call['id']];
unset($this->calls[$call['id']]);
return $c;
}
/**
* Check state of calls.
*
* @internal
*/
public function checkCalls(): void
{
\array_walk($this->calls, function ($controller, $id): void {
if ($controller->getCallState() === VoIP::CALL_STATE_ENDED) {
$this->logger('Discarding ended call...');
$controller->discard();
unset($this->calls[$id]);
}
});
}
}
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