public function authenticate(\fpoirotte\Pssht\Messages\USERAUTH\REQUEST\Base $message, \fpoirotte\Pssht\Transport $transport, array &$context)
{
if (!$message instanceof \fpoirotte\Pssht\Messages\USERAUTH\REQUEST\PublicKey) {
throw new \InvalidArgumentException();
}
if ($message->getSignature() === null) {
return self::AUTH_REJECT;
}
$logging = \Plop\Plop::getInstance();
$reverse = gethostbyaddr($transport->getAddress());
$algos = \fpoirotte\Pssht\Algorithms::factory();
$cls = $algos->getClass('PublicKey', $message->getAlgorithm());
if ($cls === null || !$this->store->exists($message->getUserName(), $message->getKey())) {
$logging->info('Rejected public key connection from remote host "%(reverse)s" ' . 'to "%(luser)s" (unsupported key)', array('luser' => escape($message->getUserName()), 'reverse' => $reverse));
return self::AUTH_REJECT;
}
$key = $cls::loadPublic(base64_encode($message->getKey()));
$encoder = new \fpoirotte\Pssht\Wire\Encoder();
$encoder->encodeString($context['DH']->getExchangeHash());
$encoder->encodeBytes(chr(\fpoirotte\Pssht\Messages\USERAUTH\REQUEST\Base::getMessageId()));
$encoder->encodeString($message->getUserName());
$encoder->encodeString($message->getServiceName());
$encoder->encodeString(static::getName());
$encoder->encodeBoolean(true);
$encoder->encodeString($message->getAlgorithm());
$encoder->encodeString($message->getKey());
if ($key->check($encoder->getBuffer()->get(0), $message->getSignature())) {
$logging->info('Accepted public key connection from remote host "%(reverse)s" ' . 'to "%(luser)s" (using "%(algorithm)s" algorithm)', array('luser' => escape($message->getUserName()), 'reverse' => $reverse, 'algorithm' => escape($message->getAlgorithm())));
return self::AUTH_ACCEPT;
}
$logging->info('Rejected public key connection from remote host "%(reverse)s" ' . 'to "%(luser)s" (invalid signature)', array('luser' => escape($message->getUserName()), 'reverse' => $reverse));
return self::AUTH_REJECT;
}
public function handle($msgType, \fpoirotte\Pssht\Wire\Decoder $decoder, \fpoirotte\Pssht\Transport $transport, array &$context)
{
$encoder = new \fpoirotte\Pssht\Wire\Encoder();
$channel = $decoder->decodeUint32();
$type = $decoder->decodeString();
$wantsReply = $decoder->decodeBoolean();
$encoder->encodeUint32($channel);
$encoder->encodeString($type);
$encoder->encodeBoolean($wantsReply);
$decoder->getBuffer()->unget($encoder->getBuffer()->get(0));
$remoteChannel = $this->connection->getChannel($channel);
switch ($type) {
case 'exec':
case 'shell':
case 'pty-req':
// Normalize the name.
// Eg. "pty-req" becomes "PtyReq".
$cls = str_replace(' ', '', ucwords(str_replace('-', ' ', $type)));
$cls = '\\fpoirotte\\Pssht\\Messages\\CHANNEL\\REQUEST\\' . $cls;
$message = $cls::unserialize($decoder);
break;
default:
if ($wantsReply) {
$response = new \fpoirotte\Pssht\Messages\CHANNEL\FAILURE($remoteChannel);
$transport->writeMessage($response);
}
return true;
}
if (!$wantsReply) {
return true;
}
if (in_array($type, array('shell', 'exec'), true)) {
$response = new \fpoirotte\Pssht\Messages\CHANNEL\SUCCESS($remoteChannel);
} else {
$response = new \fpoirotte\Pssht\Messages\CHANNEL\FAILURE($remoteChannel);
}
$transport->writeMessage($response);
if (in_array($type, array('shell', 'exec'), true)) {
$callable = $transport->getApplicationFactory();
if ($callable !== null) {
call_user_func($callable, $transport, $this->connection, $message);
}
}
return true;
}
