include/auth_ejabberd.php

   1 #!/usr/bin/php
   2 <?php
   3 /*
   4  * ejabberd extauth script for the integration with friendica
   5  *
   6  * Originally written for joomla by Dalibor Karlovic <dado@krizevci.info>
   7  * modified for Friendica by Michael Vogel <icarus@dabo.de>
   8  * published under GPL
   9  *
  10  * Latest version of the original script for joomla is available at:
  11  * http://87.230.15.86/~dado/ejabberd/joomla-login
  12  *
  13  * Installation:
  14  *
  15  *      - Change it's owner to whichever user is running the server, ie. ejabberd
  16  *        $ chown ejabberd:ejabberd /path/to/friendica/include/auth_ejabberd.php
  17  *
  18  *      - Change the access mode so it is readable only to the user ejabberd and has exec
  19  *        $ chmod 700 /path/to/friendica/include/auth_ejabberd.php
  20  *
  21  *      - Edit your ejabberd.cfg file, comment out your auth_method and add:
  22  *        {auth_method, external}.
  23  *        {extauth_program, "/path/to/friendica/include/auth_ejabberd.php"}.
  24  *
  25  *      - Restart your ejabberd service, you should be able to login with your friendica auth info
  26  *
  27  * Other hints:
  28  *      - if your users have a space or a @ in their nickname, they'll run into trouble
  29  *        registering with any client so they should be instructed to replace these chars
  30  *        " " (space) is replaced with "%20"
  31  *        "@" is replaced with "(a)"
  32  *
  33  */
  34
  35 if (sizeof($_SERVER["argv"]) == 0)
  36         die();
  37
  38 $directory = dirname($_SERVER["argv"][0]);
  39
  40 if (substr($directory, 0, 1) != "/")
  41         $directory = $_SERVER["PWD"]."/".$directory;
  42
  43 $directory = realpath($directory."/..");
  44
  45 chdir($directory);
  46 require_once("boot.php");
  47
  48 global $a, $db;
  49
  50 if (is_null($a))
  51         $a = new App;
  52
  53 if (is_null($db)) {
  54         @include(".htconfig.php");
  55         require_once("include/dba.php");
  56         $db = new dba($db_host, $db_user, $db_pass, $db_data);
  57         unset($db_host, $db_user, $db_pass, $db_data);
  58 };
  59
  60 // the logfile to which to write, should be writeable by the user which is running the server
  61 $sLogFile = get_config('jabber','logfile');
  62
  63 // set true to debug if needed
  64 $bDebug = get_config('jabber','debug');
  65
  66 $oAuth = new exAuth($sLogFile, $bDebug);
  67
  68 class exAuth {
  69         private $sLogFile;
  70         private $bDebug;
  71
  72         private $rLogFile;
  73
  74         /**
  75          * @brief Create the class and do the authentification studd
  76          *
  77          * @param string $sLogFile The logfile name
  78          * @param boolean $bDebug Debug mode
  79          */
  80         public function __construct($sLogFile, $bDebug) {
  81                 global $db;
  82
  83                 // setter
  84                 $this->sLogFile         = $sLogFile;
  85                 $this->bDebug           = $bDebug;
  86
  87                 // Open the logfile if the logfile name is defined
  88                 if ($this->sLogFile != '')
  89                         $this->rLogFile = fopen($this->sLogFile, "a") or die("Error opening log file: ". $this->sLogFile);
  90
  91                 $this->writeLog("[exAuth] start");
  92
  93                 // We are connected to the SQL server and are having a log file.
  94                 do {
  95                         // Quit if the database connection went down
  96                         if (!$db->connected()) {
  97                                 $this->writeDebugLog("[debug] the database connection went down");
  98                                 return;
  99                         }
 100
 101                         $iHeader = fgets(STDIN, 3);
 102                         $aLength = unpack("n", $iHeader);
 103                         $iLength = $aLength["1"];
 104
 105                         // No data? Then quit
 106                         if ($iLength == 0) {
 107                                 $this->writeDebugLog("[debug] we got no data");
 108                                 return;
 109                         }
 110
 111                         // Fetching the data
 112                         $sData = fgets(STDIN, $iLength + 1);
 113                         $this->writeDebugLog("[debug] received data: ". $sData);
 114                         $aCommand = explode(":", $sData);
 115                         if (is_array($aCommand)) {
 116                                 switch ($aCommand[0]) {
 117                                         case "isuser":
 118                                                 // Check the existance of a given username
 119                                                 $this->isuser($aCommand);
 120                                                 break;
 121                                         case "auth":
 122                                                 // Check if the givven password is correct
 123                                                 $this->auth($aCommand);
 124                                                 break;
 125                                         case "setpass":
 126                                                 // We don't accept the setting of passwords here
 127                                                 $this->writeLog("[exAuth] setpass command disabled");
 128                                                 fwrite(STDOUT, pack("nn", 2, 0));
 129                                                 break;
 130                                         default:
 131                                                 // We don't know the given command
 132                                                 $this->writeLog("[exAuth] unknown command ". $aCommand[0]);
 133                                                 fwrite(STDOUT, pack("nn", 2, 0));
 134                                                 break;
 135                                 }
 136                         } else {
 137                                 $this->writeDebugLog("[debug] invalid command string");
 138                                 fwrite(STDOUT, pack("nn", 2, 0));
 139                         }
 140                 } while (true);
 141         }
 142
 143         /**
 144          * @brief Check if the given username exists
 145          *
 146          * @param array $aCommand The command array
 147          */
 148         private function isuser($aCommand) {
 149                 global $a;
 150
 151                 // Check if there is a username
 152                 if (!isset($aCommand[1])) {
 153                         $this->writeLog("[exAuth] invalid isuser command, no username given");
 154                         fwrite(STDOUT, pack("nn", 2, 0));
 155                         return;
 156                 }
 157
 158                 // Now we check if the given user is valid
 159                 $sUser = str_replace(array("%20", "(a)"), array(" ", "@"), $aCommand[1]);
 160                 $this->writeDebugLog("[debug] checking isuser for ". $sUser."@".$aCommand[2]);
 161
 162                 // If the hostnames doesn't match, we try to check remotely
 163                 if ($a->get_hostname() != $aCommand[2])
 164                         $found = $this->check_user($aCommand[2], $aCommand[1], true);
 165                 else {
 166                         $sQuery = "SELECT `uid` FROM `user` WHERE `nickname`='".dbesc($sUser)."'";
 167                         $this->writeDebugLog("[debug] using query ". $sQuery);
 168                         $r = q($sQuery);
 169                         $found = dbm::is_result($r);
 170                 }
 171
 172                 if ($found) {
 173                         // The user is okay
 174                         $this->writeLog("[exAuth] valid user: ". $sUser);
 175                         fwrite(STDOUT, pack("nn", 2, 1));
 176                 } else {
 177                         // The user isn't okay
 178                         $this->writeLog("[exAuth] invalid user: ". $sUser);
 179                         fwrite(STDOUT, pack("nn", 2, 0));
 180                 }
 181         }
 182
 183         /**
 184          * @brief Check remote user existance via HTTP(S)
 185          *
 186          * @param string $host The hostname
 187          * @param string $user Username
 188          * @param boolean $ssl Should the check be done via SSL?
 189          *
 190          * @return boolean Was the user found?
 191          */
 192         private function check_user($host, $user, $ssl) {
 193
 194                 $url = ($ssl ? "https":"http")."://".$host."/noscrape/".$user;
 195
 196                 $data = z_fetch_url($url);
 197
 198                 if (!is_array($data))
 199                         return(false);
 200
 201                 if ($data["return_code"] != "200")
 202                         return(false);
 203
 204                 $json = @json_decode($data["body"]);
 205                 if (!is_object($json))
 206                         return(false);
 207
 208                 return($json->nick == $user);
 209         }
 210
 211         /**
 212          * @brief Authenticate the givven user and password
 213          *
 214          * @param array $aCommand The command array
 215          */
 216         private function auth($aCommand) {
 217                 global $a;
 218
 219                 // check user authentication
 220                 if (sizeof($aCommand) != 4) {
 221                         $this->writeLog("[exAuth] invalid auth command, data missing");
 222                         fwrite(STDOUT, pack("nn", 2, 0));
 223                         return;
 224                 }
 225
 226                 // We now check if the password match
 227                 $sUser = str_replace(array("%20", "(a)"), array(" ", "@"), $aCommand[1]);
 228                 $this->writeDebugLog("[debug] doing auth for ".$sUser."@".$aCommand[2]);
 229
 230                 // If the hostnames doesn't match, we try to authenticate remotely
 231                 if ($a->get_hostname() != $aCommand[2])
 232                         $Error = !$this->check_credentials($aCommand[2], $aCommand[1], $aCommand[3], true);
 233                 else {
 234                         $sQuery = "SELECT `uid`, `password` FROM `user` WHERE `nickname`='".dbesc($sUser)."'";
 235                         $this->writeDebugLog("[debug] using query ". $sQuery);
 236                         if ($oResult = q($sQuery)) {
 237                                 $uid = $oResult[0]["uid"];
 238                                 $Error = ($oResult[0]["password"] != hash('whirlpool',$aCommand[3]));
 239                         } else {
 240                                 $this->writeLog("[MySQL] invalid query: ". $sQuery);
 241                                 $Error = true;
 242                                 $uid = -1;
 243                         }
 244                         if ($Error) {
 245                                 $oConfig = q("SELECT `v` FROM `pconfig` WHERE `uid` = %d AND `cat` = 'xmpp' AND `k`='password' LIMIT 1;", intval($uid));
 246                                 $this->writeLog("[exAuth] got password ".$oConfig[0]["v"]);
 247                                 $Error = ($aCommand[3] != $oConfig[0]["v"]);
 248                         }
 249                 }
 250
 251                 if ($Error) {
 252                         $this->writeLog("[exAuth] authentification failed for user ".$sUser."@". $aCommand[2]);
 253                         fwrite(STDOUT, pack("nn", 2, 0));
 254                 } else {
 255                         $this->writeLog("[exAuth] authentificated user ".$sUser."@".$aCommand[2]);
 256                         fwrite(STDOUT, pack("nn", 2, 1));
 257                 }
 258         }
 259
 260         /**
 261          * @brief Check remote credentials via HTTP(S)
 262          *
 263          * @param string $host The hostname
 264          * @param string $user Username
 265          * @param string $password Password
 266          * @param boolean $ssl Should the check be done via SSL?
 267          *
 268          * @return boolean Are the credentials okay?
 269          */
 270         private function check_credentials($host, $user, $password, $ssl) {
 271                 $this->writeDebugLog("[debug] check credentials for user ".$user." on ".$host);
 272
 273                 $url = ($ssl ? "https":"http")."://".$host."/api/account/verify_credentials.json";
 274
 275                 $ch = curl_init();
 276                 curl_setopt($ch, CURLOPT_URL, $url);
 277                 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 278                 curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
 279                 curl_setopt($ch, CURLOPT_HEADER, true);
 280                 curl_setopt($ch, CURLOPT_NOBODY, true);
 281                 curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
 282                 curl_setopt($ch, CURLOPT_USERPWD, $user.':'.$password);
 283
 284                 $header = curl_exec($ch);
 285                 $curl_info = @curl_getinfo($ch);
 286                 $http_code = $curl_info["http_code"];
 287                 curl_close($ch);
 288
 289                 $this->writeDebugLog("[debug] got HTTP code ".$http_code);
 290
 291                 return ($http_code == 200);
 292         }
 293
 294         /**
 295          * @brief write data to the logfile
 296          *
 297          * @param string $sMessage The logfile message
 298          */
 299         private function writeLog($sMessage) {
 300                 if (is_resource($this->rLogFile))
 301                         fwrite($this->rLogFile, date("r")." ".$sMessage."\n");
 302         }
 303
 304         /**
 305          * @brief write debug data to the logfile
 306          *
 307          * @param string $sMessage The logfile message
 308          */
 309         private function writeDebugLog($sMessage) {
 310                 if ($this->bDebug)
 311                         $this->writeLog($sMessage);
 312         }
 313
 314         /**
 315          * @brief destroy the class
 316          */
 317         public function __destruct() {
 318                 // close the log file
 319                 $this->writeLog("[exAuth] stop");
 320
 321                 if (is_resource($this->rLogFile))
 322                         fclose($this->rLogFile);
 323         }
 324 }
 325 ?>