+<?php
+
+/**
+ * ejabberd extauth script for the integration with friendica
+ *
+ * Originally written for joomla by Dalibor Karlovic <dado@krizevci.info>
+ * modified for Friendica by Michael Vogel <icarus@dabo.de>
+ * published under GPL
+ *
+ * Latest version of the original script for joomla is available at:
+ * http://87.230.15.86/~dado/ejabberd/joomla-login
+ *
+ * Installation:
+ *
+ * - Change it's owner to whichever user is running the server, ie. ejabberd
+ * $ chown ejabberd:ejabberd /path/to/friendica/bin/auth_ejabberd.php
+ *
+ * - Change the access mode so it is readable only to the user ejabberd and has exec
+ * $ chmod 700 /path/to/friendica/bin/auth_ejabberd.php
+ *
+ * - Edit your ejabberd.cfg file, comment out your auth_method and add:
+ * {auth_method, external}.
+ * {extauth_program, "/path/to/friendica/bin/auth_ejabberd.php"}.
+ *
+ * - Restart your ejabberd service, you should be able to login with your friendica auth info
+ *
+ * Other hints:
+ * - if your users have a space or a @ in their nickname, they'll run into trouble
+ * registering with any client so they should be instructed to replace these chars
+ * " " (space) is replaced with "%20"
+ * "@" is replaced with "(a)"
+ *
+ */
+
+namespace Friendica\Security;
+
+use Exception;
+use Friendica\App;
+use Friendica\Core\Config\IConfig;
+use Friendica\Core\PConfig\IPConfig;
+use Friendica\Database\Database;
+use Friendica\DI;
+use Friendica\Model\User;
+use Friendica\Network\HTTPException;
+use Friendica\Util\PidFile;
+
+class ExAuth
+{
+ private $bDebug;
+ private $host;
+
+ /**
+ * @var App\Mode
+ */
+ private $appMode;
+ /**
+ * @var IConfig
+ */
+ private $config;
+ /**
+ * @var IPConfig
+ */
+ private $pConfig;
+ /**
+ * @var Database
+ */
+ private $dba;
+ /**
+ * @var App\BaseURL
+ */
+ private $baseURL;
+
+ /**
+ * @param App\Mode $appMode
+ * @param IConfig $config
+ * @param IPConfig $pConfig
+ * @param Database $dba
+ * @param App\BaseURL $baseURL
+ * @throws Exception
+ */
+ public function __construct(App\Mode $appMode, IConfig $config, IPConfig $pConfig, Database $dba, App\BaseURL $baseURL)
+ {
+ $this->appMode = $appMode;
+ $this->config = $config;
+ $this->pConfig = $pConfig;
+ $this->dba = $dba;
+ $this->baseURL = $baseURL;
+
+ $this->bDebug = (int)$config->get('jabber', 'debug');
+
+ openlog('auth_ejabberd', LOG_PID, LOG_USER);
+
+ $this->writeLog(LOG_NOTICE, 'start');
+ }
+
+ /**
+ * Standard input reading function, executes the auth with the provided
+ * parameters
+ *
+ * @throws HTTPException\InternalServerErrorException
+ */
+ public function readStdin()
+ {
+ if (!$this->appMode->isNormal()) {
+ $this->writeLog(LOG_ERR, 'The node isn\'t ready.');
+ return;
+ }
+
+ while (!feof(STDIN)) {
+ // Quit if the database connection went down
+ if (!$this->dba->isConnected()) {
+ $this->writeLog(LOG_ERR, 'the database connection went down');
+ return;
+ }
+
+ $iHeader = fgets(STDIN, 3);
+ if (empty($iHeader)) {
+ $this->writeLog(LOG_ERR, 'empty stdin');
+ return;
+ }
+
+ $aLength = unpack('n', $iHeader);
+ $iLength = $aLength['1'];
+
+ // No data? Then quit
+ if ($iLength == 0) {
+ $this->writeLog(LOG_ERR, 'we got no data, quitting');
+ return;
+ }
+
+ // Fetching the data
+ $sData = fgets(STDIN, $iLength + 1);
+ $this->writeLog(LOG_DEBUG, 'received data: ' . $sData);
+ $aCommand = explode(':', $sData);
+ if (is_array($aCommand)) {
+ switch ($aCommand[0]) {
+ case 'isuser':
+ // Check the existance of a given username
+ $this->isUser($aCommand);
+ break;
+ case 'auth':
+ // Check if the givven password is correct
+ $this->auth($aCommand);
+ break;
+ case 'setpass':
+ // We don't accept the setting of passwords here
+ $this->writeLog(LOG_NOTICE, 'setpass command disabled');
+ fwrite(STDOUT, pack('nn', 2, 0));
+ break;
+ default:
+ // We don't know the given command
+ $this->writeLog(LOG_NOTICE, 'unknown command ' . $aCommand[0]);
+ fwrite(STDOUT, pack('nn', 2, 0));
+ break;
+ }
+ } else {
+ $this->writeLog(LOG_NOTICE, 'invalid command string ' . $sData);
+ fwrite(STDOUT, pack('nn', 2, 0));
+ }
+ }
+ }
+
+ /**
+ * Check if the given username exists
+ *
+ * @param array $aCommand The command array
+ * @throws HTTPException\InternalServerErrorException
+ */
+ private function isUser(array $aCommand)
+ {
+ // Check if there is a username
+ if (!isset($aCommand[1])) {
+ $this->writeLog(LOG_NOTICE, 'invalid isuser command, no username given');
+ fwrite(STDOUT, pack('nn', 2, 0));
+ return;
+ }
+
+ // We only allow one process per hostname. So we set a lock file
+ // Problem: We get the firstname after the first auth - not before
+ $this->setHost($aCommand[2]);
+
+ // Now we check if the given user is valid
+ $sUser = str_replace(['%20', '(a)'], [' ', '@'], $aCommand[1]);
+
+ // Does the hostname match? So we try directly
+ if ($this->baseURL->getHostname() == $aCommand[2]) {
+ $this->writeLog(LOG_INFO, 'internal user check for ' . $sUser . '@' . $aCommand[2]);
+ $found = $this->dba->exists('user', ['nickname' => $sUser]);
+ } else {
+ $found = false;
+ }
+
+ // If the hostnames doesn't match or there is some failure, we try to check remotely
+ if (!$found) {
+ $found = $this->checkUser($aCommand[2], $aCommand[1], true);
+ }
+
+ if ($found) {
+ // The user is okay
+ $this->writeLog(LOG_NOTICE, 'valid user: ' . $sUser);
+ fwrite(STDOUT, pack('nn', 2, 1));
+ } else {
+ // The user isn't okay
+ $this->writeLog(LOG_WARNING, 'invalid user: ' . $sUser);
+ fwrite(STDOUT, pack('nn', 2, 0));
+ }
+ }
+
+ /**
+ * Check remote user existance via HTTP(S)
+ *
+ * @param string $host The hostname
+ * @param string $user Username
+ * @param boolean $ssl Should the check be done via SSL?
+ *
+ * @return boolean Was the user found?
+ * @throws HTTPException\InternalServerErrorException
+ */
+ private function checkUser($host, $user, $ssl)
+ {
+ $this->writeLog(LOG_INFO, 'external user check for ' . $user . '@' . $host);
+
+ $url = ($ssl ? 'https' : 'http') . '://' . $host . '/noscrape/' . $user;
+
+ $curlResult = DI::httpRequest()->get($url);
+
+ if (!$curlResult->isSuccess()) {
+ return false;
+ }
+
+ if ($curlResult->getReturnCode() != 200) {
+ return false;
+ }
+
+ $json = @json_decode($curlResult->getBody());
+ if (!is_object($json)) {
+ return false;
+ }
+
+ return $json->nick == $user;
+ }
+
+ /**
+ * Authenticate the given user and password
+ *
+ * @param array $aCommand The command array
+ * @throws Exception
+ */
+ private function auth(array $aCommand)
+ {
+ // check user authentication
+ if (sizeof($aCommand) != 4) {
+ $this->writeLog(LOG_NOTICE, 'invalid auth command, data missing');
+ fwrite(STDOUT, pack('nn', 2, 0));
+ return;
+ }
+
+ // We only allow one process per hostname. So we set a lock file
+ // Problem: We get the firstname after the first auth - not before
+ $this->setHost($aCommand[2]);
+
+ // We now check if the password match
+ $sUser = str_replace(['%20', '(a)'], [' ', '@'], $aCommand[1]);
+
+ $Error = false;
+ // Does the hostname match? So we try directly
+ if ($this->baseURL->getHostname() == $aCommand[2]) {
+ try {
+ $this->writeLog(LOG_INFO, 'internal auth for ' . $sUser . '@' . $aCommand[2]);
+ User::getIdFromPasswordAuthentication($sUser, $aCommand[3], true);
+ } catch (HTTPException\ForbiddenException $ex) {
+ // User exists, authentication failed
+ $this->writeLog(LOG_INFO, 'check against alternate password for ' . $sUser . '@' . $aCommand[2]);
+ $aUser = User::getByNickname($sUser, ['uid']);
+ $sPassword = $this->pConfig->get($aUser['uid'], 'xmpp', 'password', null, true);
+ $Error = ($aCommand[3] != $sPassword);
+ } catch (\Throwable $ex) {
+ // User doesn't exist and any other failure case
+ $this->writeLog(LOG_WARNING, $ex->getMessage() . ': ' . $sUser);
+ $Error = true;
+ }
+ } else {
+ $Error = true;
+ }
+
+ // If the hostnames doesn't match or there is some failure, we try to check remotely
+ if ($Error && !$this->checkCredentials($aCommand[2], $aCommand[1], $aCommand[3], true)) {
+ $this->writeLog(LOG_WARNING, 'authentification failed for user ' . $sUser . '@' . $aCommand[2]);
+ fwrite(STDOUT, pack('nn', 2, 0));
+ } else {
+ $this->writeLog(LOG_NOTICE, 'authentificated user ' . $sUser . '@' . $aCommand[2]);
+ fwrite(STDOUT, pack('nn', 2, 1));
+ }
+ }
+
+ /**
+ * Check remote credentials via HTTP(S)
+ *
+ * @param string $host The hostname
+ * @param string $user Username
+ * @param string $password Password
+ * @param boolean $ssl Should the check be done via SSL?
+ *
+ * @return boolean Are the credentials okay?
+ */
+ private function checkCredentials($host, $user, $password, $ssl)
+ {
+ $this->writeLog(LOG_INFO, 'external credential check for ' . $user . '@' . $host);
+
+ $url = ($ssl ? 'https' : 'http') . '://' . $host . '/api/account/verify_credentials.json?skip_status=true';
+
+ $ch = curl_init();
+ curl_setopt($ch, CURLOPT_URL, $url);
+ curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
+ curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
+ curl_setopt($ch, CURLOPT_HEADER, true);
+ curl_setopt($ch, CURLOPT_NOBODY, true);
+ curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
+ curl_setopt($ch, CURLOPT_USERPWD, $user . ':' . $password);
+
+ curl_exec($ch);
+ $curl_info = @curl_getinfo($ch);
+ $http_code = $curl_info['http_code'];
+ curl_close($ch);
+
+ $this->writeLog(LOG_INFO, 'external auth for ' . $user . '@' . $host . ' returned ' . $http_code);
+
+ return $http_code == 200;
+ }
+
+ /**
+ * Set the hostname for this process
+ *
+ * @param string $host The hostname
+ */
+ private function setHost($host)
+ {
+ if (!empty($this->host)) {
+ return;
+ }
+
+ $this->writeLog(LOG_INFO, 'Hostname for process ' . getmypid() . ' is ' . $host);
+
+ $this->host = $host;
+
+ $lockpath = $this->config->get('jabber', 'lockpath');
+ if (is_null($lockpath)) {
+ $this->writeLog(LOG_INFO, 'No lockpath defined.');
+ return;
+ }
+
+ $file = $lockpath . DIRECTORY_SEPARATOR . $host;
+ if (PidFile::isRunningProcess($file)) {
+ if (PidFile::killProcess($file)) {
+ $this->writeLog(LOG_INFO, 'Old process was successfully killed');
+ } else {
+ $this->writeLog(LOG_ERR, "The old Process wasn't killed in time. We now quit our process.");
+ die();
+ }
+ }
+
+ // Now it is safe to create the pid file
+ PidFile::create($file);
+ if (!file_exists($file)) {
+ $this->writeLog(LOG_WARNING, 'Logfile ' . $file . " couldn't be created.");
+ }
+ }
+
+ /**
+ * write data to the syslog
+ *
+ * @param integer $loglevel The syslog loglevel
+ * @param string $sMessage The syslog message
+ */
+ private function writeLog($loglevel, $sMessage)
+ {
+ if (!$this->bDebug && ($loglevel >= LOG_DEBUG)) {
+ return;
+ }
+ syslog($loglevel, $sMessage);
+ }
+
+ /**
+ * destroy the class, close the syslog connection.
+ */
+ public function __destruct()
+ {
+ $this->writeLog(LOG_NOTICE, 'stop');
+ closelog();
+ }
+}