It's now possible to authenticate an ejabberd server against friendica. See auth_ejabberd.php for details how to install.

include/auth_ejabberd.php

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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)"
+ *
+ */
+
+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, $db;
+
+if(is_null($a)) {
+	$a = new App;
+}
+
+if(is_null($db)) {
+	@include(".htconfig.php");
+	require_once("include/dba.php");
+	$db = new dba($db_host, $db_user, $db_pass, $db_data);
+	unset($db_host, $db_user, $db_pass, $db_data);
+};
+
+// the logfile to which to write, should be writeable by the user which is running the server
+$sLogFile = get_config('jabber','logfile');
+
+// set true to debug if needed
+$bDebug	= get_config('jabber','debug');
+
+$oAuth = new exAuth($sLogFile, $bDebug);
+
+class exAuth
+{
+	private $sLogFile;
+	private $bDebug;
+
+	private $rLogFile;
+
+	public function __construct($sLogFile, $bDebug)
+	{
+		global $db;
+
+		// setter
+		$this->sLogFile 	= $sLogFile;
+		$this->bDebug		= $bDebug;
+
+		// ovo ne provjeravamo jer ako ne mozes kreirati log file, onda si u kvascu :)
+		if ($this->sLogFile != '')
+			$this->rLogFile = fopen($this->sLogFile, "a") or die("Error opening log file: ". $this->sLogFile);
+
+		$this->writeLog("[exAuth] start");
+
+		// ovdje bi trebali biti spojeni na MySQL, imati otvoren log i zavrtit cekalicu
+		do {
+			$iHeader	= fgets(STDIN, 3);
+			$aLength 	= unpack("n", $iHeader);
+			$iLength	= $aLength["1"];
+			if($iLength > 0) {
+				// ovo znaci da smo nesto dobili
+				$sData = fgets(STDIN, $iLength + 1);
+				$this->writeDebugLog("[debug] received data: ". $sData);
+				$aCommand = explode(":", $sData);
+				if (is_array($aCommand)){
+					switch ($aCommand[0]){
+						case "isuser":
+							// provjeravamo je li korisnik dobar
+							if (!isset($aCommand[1])){
+								$this->writeLog("[exAuth] invalid isuser command, no username given");
+								fwrite(STDOUT, pack("nn", 2, 0));
+							} else {
+								// ovdje provjeri je li korisnik OK
+								$sUser = str_replace(array("%20", "(a)"), array(" ", "@"), $aCommand[1]);
+								$this->writeDebugLog("[debug] checking isuser for ". $sUser);
+								$sQuery = "select * from user where nickname='". $db->escape($sUser) ."'";
+								$this->writeDebugLog("[debug] using query ". $sQuery);
+								if ($oResult = q($sQuery)){
+									if ($oResult) {
+										// korisnik OK
+										$this->writeLog("[exAuth] valid user: ". $sUser);
+										fwrite(STDOUT, pack("nn", 2, 1));
+									} else {
+										// korisnik nije OK
+										$this->writeLog("[exAuth] invalid user: ". $sUser);
+										fwrite(STDOUT, pack("nn", 2, 0));
+									}
+									$oResult->close();
+								} else {
+									$this->writeLog("[MySQL] invalid query: ". $sQuery);
+									fwrite(STDOUT, pack("nn", 2, 0));
+								}
+							}
+						break;
+						case "auth":
+							// provjeravamo autentifikaciju korisnika
+							if (sizeof($aCommand) != 4){
+								$this->writeLog("[exAuth] invalid auth command, data missing");
+								fwrite(STDOUT, pack("nn", 2, 0));
+							} else {
+								// ovdje provjeri prijavu
+								$sUser = str_replace(array("%20", "(a)"), array(" ", "@"), $aCommand[1]);
+								$this->writeDebugLog("[debug] doing auth for ". $sUser);
+								$sQuery = "select * from user where password='".hash('whirlpool',$aCommand[3])."' and nickname='". $db->escape($sUser) ."'";
+								$this->writeDebugLog("[debug] using query ". $sQuery);
+								if ($oResult = q($sQuery)){
+									if ($oResult) {
+										// korisnik OK
+										$this->writeLog("[exAuth] authentificated user ". $sUser ."@". $aCommand[2]);
+										fwrite(STDOUT, pack("nn", 2, 1));
+									} else {
+										// korisnik nije OK
+										$this->writeLog("[exAuth] authentification failed for user ". $sUser ."@". $aCommand[2]);
+										fwrite(STDOUT, pack("nn", 2, 0));
+									}
+									$oResult->close();
+								} else {
+									$this->writeLog("[MySQL] invalid query: ". $sQuery);
+									fwrite(STDOUT, pack("nn", 2, 0));
+								}
+							}
+						break;
+						case "setpass":
+							// postavljanje zaporke, onemoguceno
+							$this->writeLog("[exAuth] setpass command disabled");
+							fwrite(STDOUT, pack("nn", 2, 0));
+						break;
+						default:
+							// ako je uhvaceno ista drugo
+							$this->writeLog("[exAuth] unknown command ". $aCommand[0]);
+							fwrite(STDOUT, pack("nn", 2, 0));
+						break;
+					}
+				} else {
+					$this->writeDebugLog("[debug] invalid command string");
+					fwrite(STDOUT, pack("nn", 2, 0));
+				}
+			}
+			unset ($iHeader);
+			unset ($aLength);
+			unset ($iLength);
+			unset($aCommand);
+		} while (true);
+	}
+
+	public function __destruct()
+	{
+		// zatvori log file
+		$this->writeLog("[exAuth] stop");
+
+		if (is_resource($this->rLogFile)){
+			fclose($this->rLogFile);
+		}
+	}
+
+	private function writeLog($sMessage)
+	{
+		if (is_resource($this->rLogFile)) {
+			fwrite($this->rLogFile, date("r") ." ". $sMessage ."\n");
+		}
+	}
+
+	private function writeDebugLog($sMessage)
+	{
+		if ($this->bDebug){
+			$this->writeLog($sMessage);
+		}
+	}
+
+}
+?>
+
+