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 authenticate(\fpoirotte\Pssht\Messages\USERAUTH\REQUEST\Base $message, \fpoirotte\Pssht\Transport $transport, array &$context)
{
if (!$message instanceof \fpoirotte\Pssht\Messages\USERAUTH\REQUEST\HostBased) {
throw new \InvalidArgumentException();
}
$logging = \Plop\Plop::getInstance();
$reverse = gethostbyaddr($transport->getAddress());
$untrustedHost = rtrim($message->getHostname(), '.');
$algos = \fpoirotte\Pssht\Algorithms::factory();
$cls = $algos->getClass('PublicKey', $message->getAlgorithm());
if ($cls === null || !$this->store->exists($message->getUserName(), $message->getKey())) {
$logging->info('Rejected host based connection from %(ruser)s@%(rhost)s ' . '(%(ruser)s@%(reverse)s) to "%(luser)s" ' . '(unsupported key)', array('ruser' => escape($message->getRemoteUser()), 'luser' => escape($message->getUserName()), 'rhost' => escape($untrustedHost), 'reverse' => $reverse));
return self::AUTH_REMOVE;
}
$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());
$encoder->encodeString($message->getAlgorithm());
$encoder->encodeString($message->getKey());
$encoder->encodeString($message->getHostname());
$encoder->encodeString($message->getRemoteUser());
if (!$key->check($encoder->getBuffer()->get(0), $message->getSignature())) {
$logging->warn('Rejected host based connection from %(ruser)s@%(rhost)s ' . '(%(ruser)s@%(reverse)s) to "%(luser)s" (invalid signature)', array('ruser' => escape($message->getRemoteUser()), 'luser' => escape($message->getUserName()), 'rhost' => escape($untrustedHost), 'reverse' => $reverse));
return self::AUTH_REJECT;
}
if ($reverse !== $untrustedHost) {
$logging->warning('Ignored reverse lookup mismatch for %(address)s (' . '"%(reverse)s" vs. "%(untrusted)s")', array('address' => $transport->getAddress(), 'reverse' => $reverse, 'untrusted' => escape($untrustedHost)));
}
if ($message->getUserName() !== $message->getRemoteUser()) {
$logging->warning('Rejected host based connection from %(ruser)s@%(rhost)s ' . '(%(ruser)s@%(reverse)s): remote user does not match ' . 'local user (%(luser)s)', array('ruser' => escape($message->getRemoteUser()), 'luser' => escape($message->getUserName()), 'rhost' => escape($untrustedHost), 'reverse' => $reverse));
return self::AUTH_REMOVE;
}
$logging->info('Accepted host based connection ' . 'from "%(ruser)s@%(rhost)s" (%(ruser)s@%(reverse)s) ' . 'to "%(luser)s" (using "%(algorithm)s" algorithm)', array('ruser' => escape($message->getRemoteUser()), 'luser' => escape($message->getUserName()), 'rhost' => escape($untrustedHost), 'reverse' => $reverse, 'algorithm' => escape($message->getAlgorithm())));
return self::AUTH_ACCEPT;
}
