Verzeichnisstruktur phpBB-2.0.0
- Veröffentlicht
- 03.04.2002
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sessions.php
001 <?php
002 /***************************************************************************
003 * sessions.php
004 * -------------------
005 * begin : Saturday, Feb 13, 2001
006 * copyright : (C) 2001 The phpBB Group
007 * email : support@phpbb.com
008 *
009 * $Id$
010 *
011 *
012 ***************************************************************************/
013
014 /***************************************************************************
015 *
016 * This program is free software; you can redistribute it and/or modify
017 * it under the terms of the GNU General Public License as published by
018 * the Free Software Foundation; either version 2 of the License, or
019 * (at your option) any later version.
020 *
021 ***************************************************************************/
022
023 //
024 // Adds/updates a new session to the database for the given userid.
025 // Returns the new session ID on success.
026 //
027 function session_begin($user_id, $user_ip, $page_id, $auto_create = 0, $enable_autologin = 0, $admin = 0)
028 {
029 global $db, $board_config;
030 global $HTTP_COOKIE_VARS, $HTTP_GET_VARS, $SID;
031
032 $cookiename = $board_config['cookie_name'];
033 $cookiepath = $board_config['cookie_path'];
034 $cookiedomain = $board_config['cookie_domain'];
035 $cookiesecure = $board_config['cookie_secure'];
036
037 if ( isset($HTTP_COOKIE_VARS[$cookiename . '_sid']) || isset($HTTP_COOKIE_VARS[$cookiename . '_data']) )
038 {
039 $session_id = isset($HTTP_COOKIE_VARS[$cookiename . '_sid']) ? $HTTP_COOKIE_VARS[$cookiename . '_sid'] : '';
040 $sessiondata = isset($HTTP_COOKIE_VARS[$cookiename . '_data']) ? unserialize(stripslashes($HTTP_COOKIE_VARS[$cookiename . '_data'])) : array();
041 $sessionmethod = SESSION_METHOD_COOKIE;
042 }
043 else
044 {
045 $sessiondata = array();
046 $session_id = ( isset($HTTP_GET_VARS['sid']) ) ? $HTTP_GET_VARS['sid'] : '';
047 $sessionmethod = SESSION_METHOD_GET;
048 }
049
050 //
051 if (!preg_match('/^[A-Za-z0-9]*$/', $session_id))
052 {
053 $session_id = '';
054 }
055
056 $page_id = (int) $page_id;
057
058 $last_visit = 0;
059 $current_time = time();
060
061 //
062 // Are auto-logins allowed?
063 // If allow_autologin is not set or is true then they are
064 // (same behaviour as old 2.0.x session code)
065 //
066 if (isset($board_config['allow_autologin']) && !$board_config['allow_autologin'])
067 {
068 $enable_autologin = $sessiondata['autologinid'] = false;
069 }
070
071 //
072 // First off attempt to join with the autologin value if we have one
073 // If not, just use the user_id value
074 //
075 $userdata = array();
076
077 if ($user_id != ANONYMOUS)
078 {
079 if (isset($sessiondata['autologinid']) && (string) $sessiondata['autologinid'] != '' && $user_id)
080 {
081 $sql = 'SELECT u.*
082 FROM ' . USERS_TABLE . ' u, ' . SESSIONS_KEYS_TABLE . ' k
083 WHERE u.user_id = ' . (int) $user_id . "
084 AND u.user_active = 1
085 AND k.user_id = u.user_id
086 AND k.key_id = '" . md5($sessiondata['autologinid']) . "'";
087 if (!($result = $db->sql_query($sql)))
088 {
089 message_die(CRITICAL_ERROR, 'Error doing DB query userdata row fetch', '', __LINE__, __FILE__, $sql);
090 }
091
092 $userdata = $db->sql_fetchrow($result);
093 $db->sql_freeresult($result);
094
095 $enable_autologin = $login = 1;
096 }
097 else if (!$auto_create)
098 {
099 $sessiondata['autologinid'] = '';
100 $sessiondata['userid'] = $user_id;
101
102 $sql = 'SELECT *
103 FROM ' . USERS_TABLE . '
104 WHERE user_id = ' . (int) $user_id . '
105 AND user_active = 1';
106 if (!($result = $db->sql_query($sql)))
107 {
108 message_die(CRITICAL_ERROR, 'Error doing DB query userdata row fetch', '', __LINE__, __FILE__, $sql);
109 }
110
111 $userdata = $db->sql_fetchrow($result);
112 $db->sql_freeresult($result);
113
114 $login = 1;
115 }
116 }
117
118 //
119 // At this point either $userdata should be populated or
120 // one of the below is true
121 // * Key didn't match one in the DB
122 // * User does not exist
123 // * User is inactive
124 //
125 if (!sizeof($userdata) || !is_array($userdata) || !$userdata)
126 {
127 $sessiondata['autologinid'] = '';
128 $sessiondata['userid'] = $user_id = ANONYMOUS;
129 $enable_autologin = $login = 0;
130
131 $sql = 'SELECT *
132 FROM ' . USERS_TABLE . '
133 WHERE user_id = ' . (int) $user_id;
134 if (!($result = $db->sql_query($sql)))
135 {
136 message_die(CRITICAL_ERROR, 'Error doing DB query userdata row fetch', '', __LINE__, __FILE__, $sql);
137 }
138
139 $userdata = $db->sql_fetchrow($result);
140 $db->sql_freeresult($result);
141 }
142
143
144 //
145 // Initial ban check against user id, IP and email address
146 //
147 preg_match('/(..)(..)(..)(..)/', $user_ip, $user_ip_parts);
148
149 $sql = "SELECT ban_ip, ban_userid, ban_email
150 FROM " . BANLIST_TABLE . "
151 WHERE ban_ip IN ('" . $user_ip_parts[1] . $user_ip_parts[2] . $user_ip_parts[3] . $user_ip_parts[4] . "', '" . $user_ip_parts[1] . $user_ip_parts[2] . $user_ip_parts[3] . "ff', '" . $user_ip_parts[1] . $user_ip_parts[2] . "ffff', '" . $user_ip_parts[1] . "ffffff')
152 OR ban_userid = $user_id";
153 if ( $user_id != ANONYMOUS )
154 {
155 $sql .= " OR ban_email LIKE '" . str_replace("\'", "''", $userdata['user_email']) . "'
156 OR ban_email LIKE '" . substr(str_replace("\'", "''", $userdata['user_email']), strpos(str_replace("\'", "''", $userdata['user_email']), "@")) . "'";
157 }
158 if ( !($result = $db->sql_query($sql)) )
159 {
160 message_die(CRITICAL_ERROR, 'Could not obtain ban information', '', __LINE__, __FILE__, $sql);
161 }
162
163 if ( $ban_info = $db->sql_fetchrow($result) )
164 {
165 if ( $ban_info['ban_ip'] || $ban_info['ban_userid'] || $ban_info['ban_email'] )
166 {
167 message_die(CRITICAL_MESSAGE, 'You_been_banned');
168 }
169 }
170
171 //
172 // Create or update the session
173 //
174 $sql = "UPDATE " . SESSIONS_TABLE . "
175 SET session_user_id = $user_id, session_start = $current_time, session_time = $current_time, session_page = $page_id, session_logged_in = $login, session_admin = $admin
176 WHERE session_id = '" . $session_id . "'
177 AND session_ip = '$user_ip'";
178 if ( !$db->sql_query($sql) || !$db->sql_affectedrows() )
179 {
180 $session_id = md5(dss_rand());
181 $priv_session_id = md5(dss_rand());
182
183 $sql = "INSERT INTO " . SESSIONS_TABLE . "
184 (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin, priv_session_id)
185 VALUES ('$session_id', $user_id, $current_time, $current_time, '$user_ip', $page_id, $login, $admin, '$priv_session_id')";
186 if ( !$db->sql_query($sql) )
187 {
188 message_die(CRITICAL_ERROR, 'Error creating new session', '', __LINE__, __FILE__, $sql);
189 }
190 }
191
192 if ( $user_id != ANONYMOUS )
193 {
194 $last_visit = ( $userdata['user_session_time'] > 0 ) ? $userdata['user_session_time'] : $current_time;
195
196 if (!$admin)
197 {
198 $sql = "UPDATE " . USERS_TABLE . "
199 SET user_session_time = $current_time, user_session_page = $page_id, user_lastvisit = $last_visit
200 WHERE user_id = $user_id";
201 if ( !$db->sql_query($sql) )
202 {
203 message_die(CRITICAL_ERROR, 'Error updating last visit time', '', __LINE__, __FILE__, $sql);
204 }
205 }
206
207 $userdata['user_lastvisit'] = $last_visit;
208
209 //
210 // Regenerate the auto-login key
211 //
212 if ($enable_autologin)
213 {
214 $auto_login_key = dss_rand() . dss_rand();
215
216 if (isset($sessiondata['autologinid']) && (string) $sessiondata['autologinid'] != '')
217 {
218 $sql = 'UPDATE ' . SESSIONS_KEYS_TABLE . "
219 SET last_ip = '$user_ip', key_id = '" . md5($auto_login_key) . "', last_login = $current_time
220 WHERE key_id = '" . md5($sessiondata['autologinid']) . "'";
221 }
222 else
223 {
224 $sql = 'INSERT INTO ' . SESSIONS_KEYS_TABLE . "(key_id, user_id, last_ip, last_login)
225 VALUES ('" . md5($auto_login_key) . "', $user_id, '$user_ip', $current_time)";
226 }
227
228 if ( !$db->sql_query($sql) )
229 {
230 message_die(CRITICAL_ERROR, 'Error updating session key', '', __LINE__, __FILE__, $sql);
231 }
232
233 $sessiondata['autologinid'] = $auto_login_key;
234 unset($auto_login_key);
235 }
236 else
237 {
238 $sessiondata['autologinid'] = '';
239 }
240
241 // $sessiondata['autologinid'] = (!$admin) ? (( $enable_autologin && $sessionmethod == SESSION_METHOD_COOKIE ) ? $auto_login_key : '') : $sessiondata['autologinid'];
242 $sessiondata['userid'] = $user_id;
243 }
244
245 $userdata['session_id'] = $session_id;
246 $userdata['priv_session_id'] = $priv_session_id;
247 $userdata['session_ip'] = $user_ip;
248 $userdata['session_user_id'] = $user_id;
249 $userdata['session_logged_in'] = $login;
250 $userdata['session_page'] = $page_id;
251 $userdata['session_start'] = $current_time;
252 $userdata['session_time'] = $current_time;
253 $userdata['session_admin'] = $admin;
254 $userdata['session_key'] = $sessiondata['autologinid'];
255
256 setcookie($cookiename . '_data', serialize($sessiondata), $current_time + 31536000, $cookiepath, $cookiedomain, $cookiesecure);
257 setcookie($cookiename . '_sid', $session_id, 0, $cookiepath, $cookiedomain, $cookiesecure);
258
259 $SID = 'sid=' . $session_id;
260
261 return $userdata;
262 }
263
264 //
265 // Checks for a given user session, tidies session table and updates user
266 // sessions at each page refresh
267 //
268 function session_pagestart($user_ip, $thispage_id)
269 {
270 global $db, $lang, $board_config;
271 global $HTTP_COOKIE_VARS, $HTTP_GET_VARS, $SID, $P_SID;
272
273 $cookiename = $board_config['cookie_name'];
274 $cookiepath = $board_config['cookie_path'];
275 $cookiedomain = $board_config['cookie_domain'];
276 $cookiesecure = $board_config['cookie_secure'];
277
278 $current_time = time();
279 unset($userdata);
280
281 if ( isset($HTTP_COOKIE_VARS[$cookiename . '_sid']) || isset($HTTP_COOKIE_VARS[$cookiename . '_data']) )
282 {
283 $sessiondata = isset( $HTTP_COOKIE_VARS[$cookiename . '_data'] ) ? unserialize(stripslashes($HTTP_COOKIE_VARS[$cookiename . '_data'])) : array();
284 $session_id = isset( $HTTP_COOKIE_VARS[$cookiename . '_sid'] ) ? $HTTP_COOKIE_VARS[$cookiename . '_sid'] : '';
285 $sessionmethod = SESSION_METHOD_COOKIE;
286 }
287 else
288 {
289 $sessiondata = array();
290 $session_id = ( isset($HTTP_GET_VARS['sid']) ) ? $HTTP_GET_VARS['sid'] : '';
291 $sessionmethod = SESSION_METHOD_GET;
292 }
293
294 //
295 if (!preg_match('/^[A-Za-z0-9]*$/', $session_id))
296 {
297 $session_id = '';
298 }
299
300 $thispage_id = (int) $thispage_id;
301
302 //
303 // Does a session exist?
304 //
305 if ( !empty($session_id) )
306 {
307 //
308 // session_id exists so go ahead and attempt to grab all
309 // data in preparation
310 //
311 $sql = "SELECT u.*, s.*
312 FROM " . SESSIONS_TABLE . " s, " . USERS_TABLE . " u
313 WHERE s.session_id = '$session_id'
314 AND u.user_id = s.session_user_id";
315 if ( !($result = $db->sql_query($sql)) )
316 {
317 message_die(CRITICAL_ERROR, 'Error doing DB query userdata row fetch', '', __LINE__, __FILE__, $sql);
318 }
319
320 $userdata = $db->sql_fetchrow($result);
321
322 //
323 // Did the session exist in the DB?
324 //
325 if ( isset($userdata['user_id']) )
326 {
327 //
328 // Do not check IP assuming equivalence, if IPv4 we'll check only first 24
329 // bits ... I've been told (by vHiker) this should alleviate problems with
330 // load balanced et al proxies while retaining some reliance on IP security.
331 //
332 $ip_check_s = substr($userdata['session_ip'], 0, 6);
333 $ip_check_u = substr($user_ip, 0, 6);
334
335 if ($ip_check_s == $ip_check_u)
336 {
337 $SID = ($sessionmethod == SESSION_METHOD_GET || defined('IN_ADMIN')) ? 'sid=' . $session_id : '';
338 $P_SID = (defined('IN_ADMIN')) ? 'p_sid=' . $userdata['priv_session_id'] : '';
339 //
340 // Only update session DB a minute or so after last update
341 //
342 if ( $current_time - $userdata['session_time'] > 60 )
343 {
344 // A little trick to reset session_admin on session re-usage
345 $update_admin = (!defined('IN_ADMIN') && $current_time - $userdata['session_time'] > ($board_config['session_length']+60)) ? ', session_admin = 0' : '';
346
347 $sql = "UPDATE " . SESSIONS_TABLE . "
348 SET session_time = $current_time, session_page = $thispage_id$update_admin
349 WHERE session_id = '" . $userdata['session_id'] . "'";
350 if ( !$db->sql_query($sql) )
351 {
352 message_die(CRITICAL_ERROR, 'Error updating sessions table', '', __LINE__, __FILE__, $sql);
353 }
354
355 if ( $userdata['user_id'] != ANONYMOUS )
356 {
357 $sql = "UPDATE " . USERS_TABLE . "
358 SET user_session_time = $current_time, user_session_page = $thispage_id
359 WHERE user_id = " . $userdata['user_id'];
360 if ( !$db->sql_query($sql) )
361 {
362 message_die(CRITICAL_ERROR, 'Error updating sessions table', '', __LINE__, __FILE__, $sql);
363 }
364 }
365
366 session_clean($userdata['session_id']);
367
368 setcookie($cookiename . '_data', serialize($sessiondata), $current_time + 31536000, $cookiepath, $cookiedomain, $cookiesecure);
369 setcookie($cookiename . '_sid', $session_id, 0, $cookiepath, $cookiedomain, $cookiesecure);
370 }
371
372 // Add the session_key to the userdata array if it is set
373 if ( isset($sessiondata['autologinid']) && $sessiondata['autologinid'] != '' )
374 {
375 $userdata['session_key'] = $sessiondata['autologinid'];
376 }
377
378 return $userdata;
379 }
380 }
381 }
382
383 //
384 // If we reach here then no (valid) session exists. So we'll create a new one,
385 // using the cookie user_id if available to pull basic user prefs.
386 //
387 $user_id = ( isset($sessiondata['userid']) ) ? intval($sessiondata['userid']) : ANONYMOUS;
388
389 if ( !($userdata = session_begin($user_id, $user_ip, $thispage_id, TRUE)) )
390 {
391 message_die(CRITICAL_ERROR, 'Error creating user session', '', __LINE__, __FILE__, $sql);
392 }
393
394 return $userdata;
395
396 }
397
398 /**
399 * Terminates the specified session
400 * It will delete the entry in the sessions table for this session,
401 * remove the corresponding auto-login key and reset the cookies
402 */
403 function session_end($session_id, $user_id)
404 {
405 global $db, $lang, $board_config, $userdata;
406 global $HTTP_COOKIE_VARS, $HTTP_GET_VARS, $SID;
407
408 $cookiename = $board_config['cookie_name'];
409 $cookiepath = $board_config['cookie_path'];
410 $cookiedomain = $board_config['cookie_domain'];
411 $cookiesecure = $board_config['cookie_secure'];
412
413 $current_time = time();
414
415 if (!preg_match('/^[A-Za-z0-9]*$/', $session_id))
416 {
417 return;
418 }
419
420 //
421 // Delete existing session
422 //
423 $sql = 'DELETE FROM ' . SESSIONS_TABLE . "
424 WHERE session_id = '$session_id'
425 AND session_user_id = $user_id";
426 if ( !$db->sql_query($sql) )
427 {
428 message_die(CRITICAL_ERROR, 'Error removing user session', '', __LINE__, __FILE__, $sql);
429 }
430
431 //
432 // Remove this auto-login entry (if applicable)
433 //
434 if ( isset($userdata['session_key']) && $userdata['session_key'] != '' )
435 {
436 $autologin_key = md5($userdata['session_key']);
437 $sql = 'DELETE FROM ' . SESSIONS_KEYS_TABLE . '
438 WHERE user_id = ' . (int) $user_id . "
439 AND key_id = '$autologin_key'";
440 if ( !$db->sql_query($sql) )
441 {
442 message_die(CRITICAL_ERROR, 'Error removing auto-login key', '', __LINE__, __FILE__, $sql);
443 }
444 }
445
446 //
447 // We expect that message_die will be called after this function,
448 // but just in case it isn't, reset $userdata to the details for a guest
449 //
450 $sql = 'SELECT *
451 FROM ' . USERS_TABLE . '
452 WHERE user_id = ' . ANONYMOUS;
453 if ( !($result = $db->sql_query($sql)) )
454 {
455 message_die(CRITICAL_ERROR, 'Error obtaining user details', '', __LINE__, __FILE__, $sql);
456 }
457 if ( !($userdata = $db->sql_fetchrow($result)) )
458 {
459 message_die(CRITICAL_ERROR, 'Error obtaining user details', '', __LINE__, __FILE__, $sql);
460 }
461 $db->sql_freeresult($result);
462
463
464 setcookie($cookiename . '_data', '', $current_time - 31536000, $cookiepath, $cookiedomain, $cookiesecure);
465 setcookie($cookiename . '_sid', '', $current_time - 31536000, $cookiepath, $cookiedomain, $cookiesecure);
466
467 return true;
468 }
469
470 /**
471 * Removes expired sessions and auto-login keys from the database
472 */
473 function session_clean($session_id)
474 {
475 global $board_config, $db;
476
477 //
478 // Delete expired sessions
479 //
480 $sql = 'DELETE FROM ' . SESSIONS_TABLE . '
481 WHERE session_time < ' . (time() - (int) $board_config['session_length']) . "
482 AND session_id <> '$session_id'";
483 if ( !$db->sql_query($sql) )
484 {
485 message_die(CRITICAL_ERROR, 'Error clearing sessions table', '', __LINE__, __FILE__, $sql);
486 }
487
488 //
489 // Delete expired auto-login keys
490 // If max_autologin_time is not set then keys will never be deleted
491 // (same behaviour as old 2.0.x session code)
492 //
493 if (!empty($board_config['max_autologin_time']) && $board_config['max_autologin_time'] > 0)
494 {
495 $sql = 'DELETE FROM ' . SESSIONS_KEYS_TABLE . '
496 WHERE last_login < ' . (time() - (86400 * (int) $board_config['max_autologin_time']));
497 $db->sql_query($sql);
498 }
499
500 return true;
501 }
502
503 /**
504 * Reset all login keys for the specified user
505 * Called on password changes
506 */
507 function session_reset_keys($user_id, $user_ip)
508 {
509 global $db, $userdata, $board_config;
510
511 $key_sql = ($user_id == $userdata['user_id'] && !empty($userdata['session_key'])) ? "AND key_id != '" . md5($userdata['session_key']) . "'" : '';
512
513 $sql = 'DELETE FROM ' . SESSIONS_KEYS_TABLE . '
514 WHERE user_id = ' . (int) $user_id . "
515 $key_sql";
516
517 if ( !$db->sql_query($sql) )
518 {
519 message_die(CRITICAL_ERROR, 'Error removing auto-login keys', '', __LINE__, __FILE__, $sql);
520 }
521
522 $where_sql = 'session_user_id = ' . (int) $user_id;
523 $where_sql .= ($user_id == $userdata['user_id']) ? " AND session_id <> '" . $userdata['session_id'] . "'" : '';
524 $sql = 'DELETE FROM ' . SESSIONS_TABLE . "
525 WHERE $where_sql";
526 if ( !$db->sql_query($sql) )
527 {
528 message_die(CRITICAL_ERROR, 'Error removing user session(s)', '', __LINE__, __FILE__, $sql);
529 }
530
531 if ( !empty($key_sql) )
532 {
533 $auto_login_key = dss_rand() . dss_rand();
534
535 $current_time = time();
536
537 $sql = 'UPDATE ' . SESSIONS_KEYS_TABLE . "
538 SET last_ip = '$user_ip', key_id = '" . md5($auto_login_key) . "', last_login = $current_time
539 WHERE key_id = '" . md5($userdata['session_key']) . "'";
540
541 if ( !$db->sql_query($sql) )
542 {
543 message_die(CRITICAL_ERROR, 'Error updating session key', '', __LINE__, __FILE__, $sql);
544 }
545
546 // And now rebuild the cookie
547 $sessiondata['userid'] = $user_id;
548 $sessiondata['autologinid'] = $auto_login_key;
549 $cookiename = $board_config['cookie_name'];
550 $cookiepath = $board_config['cookie_path'];
551 $cookiedomain = $board_config['cookie_domain'];
552 $cookiesecure = $board_config['cookie_secure'];
553
554 setcookie($cookiename . '_data', serialize($sessiondata), $current_time + 31536000, $cookiepath, $cookiedomain, $cookiesecure);
555
556 $userdata['session_key'] = $auto_login_key;
557 unset($sessiondata);
558 unset($auto_login_key);
559 }
560 }
561
562 //
563 // Append $SID to a url. Borrowed from phplib and modified. This is an
564 // extra routine utilised by the session code above and acts as a wrapper
565 // around every single URL and form action. If you replace the session
566 // code you must include this routine, even if it's empty.
567 //
568 function append_sid($url, $non_html_amp = false)
569 {
570 global $SID, $P_SID;
571
572 if ( !empty($SID) && !preg_match('#sid=#', $url) )
573 {
574 $url .= ( ( strpos($url, '?') !== false ) ? ( ( $non_html_amp ) ? '&' : '&' ) : '?' ) . $SID;
575 }
576 if ( !empty($P_SID) && !preg_match('#p_sid=#', $url) )
577 {
578 $url .= ( ( strpos($url, '?') !== false ) ? ( ( $non_html_amp ) ? '&' : '&' ) : '?' ) . $P_SID;
579 }
580
581 return $url;
582 }
583
584 ?>