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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 ?>