Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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#!/usr/bin/php
<?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/include/auth_ejabberd.php
*
* - Change the access mode so it is readable only to the user ejabberd and has exec
* $ chmod 700 /path/to/friendica/include/auth_ejabberd.php
*
* - Edit your ejabberd.cfg file, comment out your auth_method and add:
* {auth_method, external}.
* {extauth_program, "/path/to/friendica/include/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)"
*
*/
use Friendica\App;
use Friendica\Core\Config;
if (sizeof($_SERVER["argv"]) == 0)
die();
$directory = dirname($_SERVER["argv"][0]);
if (substr($directory, 0, 1) != "/")
$directory = $_SERVER["PWD"]."/".$directory;
$directory = realpath($directory."/..");
chdir($directory);
require_once("boot.php");
global $a;
if (empty($a)) {
$a = new App(dirname(__DIR__));
}
@include(".htconfig.php");
require_once("include/dba.php");
dba::connect($db_host, $db_user, $db_pass, $db_data);
unset($db_host, $db_user, $db_pass, $db_data);
$oAuth = new exAuth();
class exAuth {
private $bDebug;
/**
* @brief Create the class and do the authentification studd
*
* @param boolean $bDebug Debug mode
*/
public function __construct() {
// setter
$this->bDebug = (int)Config::get('jabber', 'debug');
openlog('auth_ejabberd', LOG_PID, LOG_USER);
$this->writeLog(LOG_NOTICE, "start");
// We are connected to the SQL server.
do {
// Quit if the database connection went down
if (!dba::connected()) {
$this->writeLog(LOG_ERR, "the database connection went down");
return;
}
$iHeader = fgets(STDIN, 3);
$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));
}
} while (true);
}
/**
* @brief Check if the given username exists
*
* @param array $aCommand The command array
*/
private function isuser($aCommand) {
$a = get_app();
// Check if there is a username
if (!isset($aCommand[1])) {
$this->writeLog(LOG_NOTICE, "invalid isuser command, no username given");
fwrite(STDOUT, pack("nn", 2, 0));
return;
}
// Now we check if the given user is valid
$sUser = str_replace(array("%20", "(a)"), array(" ", "@"), $aCommand[1]);
// Does the hostname match? So we try directly
if ($a->get_hostname() == $aCommand[2]) {
$this->writeLog(LOG_INFO, "internal user check for ". $sUser."@".$aCommand[2]);
$sQuery = "SELECT `uid` FROM `user` WHERE `nickname`='".dbesc($sUser)."'";
$this->writeLog(LOG_DEBUG, "using query ". $sQuery);
$r = q($sQuery);
$found = dbm::is_result($r);
} else {
$found = false;
}
// If the hostnames doesn't match or there is some failure, we try to check remotely
if (!$found) {
$found = $this->check_user($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));
}
}
/**
* @brief Check remote user existance via HTTP(S)
*
* @param string $host The hostname
* @param string $user Username
* @param boolean $ssl Should the check be done via SSL?
*
* @return boolean Was the user found?
*/
private function check_user($host, $user, $ssl) {
$this->writeLog(LOG_INFO, "external user check for ".$user."@".$host);
$url = ($ssl ? "https":"http")."://".$host."/noscrape/".$user;
$data = z_fetch_url($url);
if (!is_array($data))
return(false);
if ($data["return_code"] != "200")
return(false);
$json = @json_decode($data["body"]);
if (!is_object($json))
return(false);
return($json->nick == $user);
}
/**
* @brief Authenticate the givven user and password
*
* @param array $aCommand The command array
*/
private function auth($aCommand) {
$a = get_app();
// check user authentication
if (sizeof($aCommand) != 4) {
$this->writeLog(LOG_NOTICE, "invalid auth command, data missing");
fwrite(STDOUT, pack("nn", 2, 0));
return;
}
// We now check if the password match
$sUser = str_replace(array("%20", "(a)"), array(" ", "@"), $aCommand[1]);
// Does the hostname match? So we try directly
if ($a->get_hostname() == $aCommand[2]) {
$this->writeLog(LOG_INFO, "internal auth for ".$sUser."@".$aCommand[2]);
$sQuery = "SELECT `uid`, `password` FROM `user` WHERE `nickname`='".dbesc($sUser)."'";
$this->writeLog(LOG_DEBUG, "using query ". $sQuery);
if ($oResult = q($sQuery)) {
$uid = $oResult[0]["uid"];
$Error = ($oResult[0]["password"] != hash('whirlpool',$aCommand[3]));
} else {
$this->writeLog(LOG_WARNING, "invalid query: ". $sQuery);
$Error = true;
$uid = -1;
}
if ($Error) {
$oConfig = q("SELECT `v` FROM `pconfig` WHERE `uid` = %d AND `cat` = 'xmpp' AND `k`='password' LIMIT 1;", intval($uid));
$this->writeLog(LOG_INFO, "check against alternate password for ".$sUser."@".$aCommand[2]);
$Error = ($aCommand[3] != $oConfig[0]["v"]);
}
} else {
$Error = true;
}
// If the hostnames doesn't match or there is some failure, we try to check remotely
if ($Error) {
$Error = !$this->check_credentials($aCommand[2], $aCommand[1], $aCommand[3], true);
}
if ($Error) {
$this->writeLog(LOG_WARNING, "authentification failed for user ".$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));
}
}
/**
* @brief Check remote credentials via HTTP(S)
*
* @param string $host The hostname
* @param string $user Username
* @param string $password Password
* @param boolean $ssl Should the check be done via SSL?
*
* @return boolean Are the credentials okay?
*/
private function check_credentials($host, $user, $password, $ssl) {
$url = ($ssl ? "https":"http")."://".$host."/api/account/verify_credentials.json";
$ch = curl_init();
curl_setopt($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);
$header = curl_exec($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);
}
/**
* @brief 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);
}
/**
* @brief destroy the class, close the syslog connection.
*/
public function __destruct() {
$this->writeLog(LOG_NOTICE, "stop");
closelog();
}
}