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1 <?php 2 /*************************************************************************** 3 * sessions.php 4 * ------------------- 5 * begin : Saturday, Feb 13, 2001 6 * copyright : (C) 2001 The phpBB Group 7 * email : support@phpbb.com 8 * 9 * $Id: sessions.php 5930 2006-05-18 19:23:07Z grahamje $ 10 * 11 * 12 ***************************************************************************/ 13 14 /*************************************************************************** 15 * 16 * This program is free software; you can redistribute it and/or modify 17 * it under the terms of the GNU General Public License as published by 18 * the Free Software Foundation; either version 2 of the License, or 19 * (at your option) any later version. 20 * 21 ***************************************************************************/ 22 23 // 24 // Adds/updates a new session to the database for the given userid. 25 // Returns the new session ID on success. 26 // 27 function session_begin($user_id, $user_ip, $page_id, $auto_create = 0, $enable_autologin = 0, $admin = 0) 28 { 29 global $db, $board_config; 30 global $HTTP_COOKIE_VARS, $HTTP_GET_VARS, $SID; 31 32 $cookiename = $board_config['cookie_name']; 33 $cookiepath = $board_config['cookie_path']; 34 $cookiedomain = $board_config['cookie_domain']; 35 $cookiesecure = $board_config['cookie_secure']; 36 37 if ( isset($HTTP_COOKIE_VARS[$cookiename . '_sid']) || isset($HTTP_COOKIE_VARS[$cookiename . '_data']) ) 38 { 39 $session_id = isset($HTTP_COOKIE_VARS[$cookiename . '_sid']) ? $HTTP_COOKIE_VARS[$cookiename . '_sid'] : ''; 40 $sessiondata = isset($HTTP_COOKIE_VARS[$cookiename . '_data']) ? unserialize(stripslashes($HTTP_COOKIE_VARS[$cookiename . '_data'])) : array(); 41 $sessionmethod = SESSION_METHOD_COOKIE; 42 } 43 else 44 { 45 $sessiondata = array(); 46 $session_id = ( isset($HTTP_GET_VARS['sid']) ) ? $HTTP_GET_VARS['sid'] : ''; 47 $sessionmethod = SESSION_METHOD_GET; 48 } 49 50 // 51 if (!preg_match('/^[A-Za-z0-9]*$/', $session_id)) 52 { 53 $session_id = ''; 54 } 55 56 $page_id = (int) $page_id; 57 58 $last_visit = 0; 59 $current_time = time(); 60 61 // 62 // Are auto-logins allowed? 63 // If allow_autologin is not set or is true then they are 64 // (same behaviour as old 2.0.x session code) 65 // 66 if (isset($board_config['allow_autologin']) && !$board_config['allow_autologin']) 67 { 68 $enable_autologin = $sessiondata['autologinid'] = false; 69 } 70 71 // 72 // First off attempt to join with the autologin value if we have one 73 // If not, just use the user_id value 74 // 75 $userdata = array(); 76 77 if ($user_id != ANONYMOUS) 78 { 79 if (isset($sessiondata['autologinid']) && (string) $sessiondata['autologinid'] != '' && $user_id) 80 { 81 $sql = 'SELECT u.* 82 FROM ' . USERS_TABLE . ' u, ' . SESSIONS_KEYS_TABLE . ' k 83 WHERE u.user_id = ' . (int) $user_id . " 84 AND u.user_active = 1 85 AND k.user_id = u.user_id 86 AND k.key_id = '" . md5($sessiondata['autologinid']) . "'"; 87 if (!($result = $db->sql_query($sql))) 88 { 89 message_die(CRITICAL_ERROR, 'Error doing DB query userdata row fetch', '', __LINE__, __FILE__, $sql); 90 } 91 92 $userdata = $db->sql_fetchrow($result); 93 $db->sql_freeresult($result); 94 95 $enable_autologin = $login = 1; 96 } 97 else if (!$auto_create) 98 { 99 $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()); 181 182 $sql = "INSERT INTO " . SESSIONS_TABLE . " 183 (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) 184 VALUES ('$session_id', $user_id, $current_time, $current_time, '$user_ip', $page_id, $login, $admin)"; 185 if ( !$db->sql_query($sql) ) 186 { 187 message_die(CRITICAL_ERROR, 'Error creating new session', '', __LINE__, __FILE__, $sql); 188 } 189 } 190 191 if ( $user_id != ANONYMOUS ) 192 { 193 $last_visit = ( $userdata['user_session_time'] > 0 ) ? $userdata['user_session_time'] : $current_time; 194 195 if (!$admin) 196 { 197 $sql = "UPDATE " . USERS_TABLE . " 198 SET user_session_time = $current_time, user_session_page = $page_id, user_lastvisit = $last_visit 199 WHERE user_id = $user_id"; 200 if ( !$db->sql_query($sql) ) 201 { 202 message_die(CRITICAL_ERROR, 'Error updating last visit time', '', __LINE__, __FILE__, $sql); 203 } 204 } 205 206 $userdata['user_lastvisit'] = $last_visit; 207 208 // 209 // Regenerate the auto-login key 210 // 211 if ($enable_autologin) 212 { 213 $auto_login_key = dss_rand() . dss_rand(); 214 215 if (isset($sessiondata['autologinid']) && (string) $sessiondata['autologinid'] != '') 216 { 217 $sql = 'UPDATE ' . SESSIONS_KEYS_TABLE . " 218 SET last_ip = '$user_ip', key_id = '" . md5($auto_login_key) . "', last_login = $current_time 219 WHERE key_id = '" . md5($sessiondata['autologinid']) . "'"; 220 } 221 else 222 { 223 $sql = 'INSERT INTO ' . SESSIONS_KEYS_TABLE . "(key_id, user_id, last_ip, last_login) 224 VALUES ('" . md5($auto_login_key) . "', $user_id, '$user_ip', $current_time)"; 225 } 226 227 if ( !$db->sql_query($sql) ) 228 { 229 message_die(CRITICAL_ERROR, 'Error updating session key', '', __LINE__, __FILE__, $sql); 230 } 231 232 $sessiondata['autologinid'] = $auto_login_key; 233 unset($auto_login_key); 234 } 235 else 236 { 237 $sessiondata['autologinid'] = ''; 238 } 239 240 // $sessiondata['autologinid'] = (!$admin) ? (( $enable_autologin && $sessionmethod == SESSION_METHOD_COOKIE ) ? $auto_login_key : '') : $sessiondata['autologinid']; 241 $sessiondata['userid'] = $user_id; 242 } 243 244 $userdata['session_id'] = $session_id; 245 $userdata['session_ip'] = $user_ip; 246 $userdata['session_user_id'] = $user_id; 247 $userdata['session_logged_in'] = $login; 248 $userdata['session_page'] = $page_id; 249 $userdata['session_start'] = $current_time; 250 $userdata['session_time'] = $current_time; 251 $userdata['session_admin'] = $admin; 252 $userdata['session_key'] = $sessiondata['autologinid']; 253 254 setcookie($cookiename . '_data', serialize($sessiondata), $current_time + 31536000, $cookiepath, $cookiedomain, $cookiesecure); 255 setcookie($cookiename . '_sid', $session_id, 0, $cookiepath, $cookiedomain, $cookiesecure); 256 257 $SID = 'sid=' . $session_id; 258 259 return $userdata; 260 } 261 262 // 263 // Checks for a given user session, tidies session table and updates user 264 // sessions at each page refresh 265 // 266 function session_pagestart($user_ip, $thispage_id) 267 { 268 global $db, $lang, $board_config; 269 global $HTTP_COOKIE_VARS, $HTTP_GET_VARS, $SID; 270 271 $cookiename = $board_config['cookie_name']; 272 $cookiepath = $board_config['cookie_path']; 273 $cookiedomain = $board_config['cookie_domain']; 274 $cookiesecure = $board_config['cookie_secure']; 275 276 $current_time = time(); 277 unset($userdata); 278 279 if ( isset($HTTP_COOKIE_VARS[$cookiename . '_sid']) || isset($HTTP_COOKIE_VARS[$cookiename . '_data']) ) 280 { 281 $sessiondata = isset( $HTTP_COOKIE_VARS[$cookiename . '_data'] ) ? unserialize(stripslashes($HTTP_COOKIE_VARS[$cookiename . '_data'])) : array(); 282 $session_id = isset( $HTTP_COOKIE_VARS[$cookiename . '_sid'] ) ? $HTTP_COOKIE_VARS[$cookiename . '_sid'] : ''; 283 $sessionmethod = SESSION_METHOD_COOKIE; 284 } 285 else 286 { 287 $sessiondata = array(); 288 $session_id = ( isset($HTTP_GET_VARS['sid']) ) ? $HTTP_GET_VARS['sid'] : ''; 289 $sessionmethod = SESSION_METHOD_GET; 290 } 291 292 // 293 if (!preg_match('/^[A-Za-z0-9]*$/', $session_id)) 294 { 295 $session_id = ''; 296 } 297 298 $thispage_id = (int) $thispage_id; 299 300 // 301 // Does a session exist? 302 // 303 if ( !empty($session_id) ) 304 { 305 // 306 // session_id exists so go ahead and attempt to grab all 307 // data in preparation 308 // 309 $sql = "SELECT u.*, s.* 310 FROM " . SESSIONS_TABLE . " s, " . USERS_TABLE . " u 311 WHERE s.session_id = '$session_id' 312 AND u.user_id = s.session_user_id"; 313 if ( !($result = $db->sql_query($sql)) ) 314 { 315 message_die(CRITICAL_ERROR, 'Error doing DB query userdata row fetch', '', __LINE__, __FILE__, $sql); 316 } 317 318 $userdata = $db->sql_fetchrow($result); 319 320 // 321 // Did the session exist in the DB? 322 // 323 if ( isset($userdata['user_id']) ) 324 { 325 // 326 // Do not check IP assuming equivalence, if IPv4 we'll check only first 24 327 // bits ... I've been told (by vHiker) this should alleviate problems with 328 // load balanced et al proxies while retaining some reliance on IP security. 329 // 330 $ip_check_s = substr($userdata['session_ip'], 0, 6); 331 $ip_check_u = substr($user_ip, 0, 6); 332 333 if ($ip_check_s == $ip_check_u) 334 { 335 $SID = ($sessionmethod == SESSION_METHOD_GET || defined('IN_ADMIN')) ? 'sid=' . $session_id : ''; 336 337 // 338 // Only update session DB a minute or so after last update 339 // 340 if ( $current_time - $userdata['session_time'] > 60 ) 341 { 342 // A little trick to reset session_admin on session re-usage 343 $update_admin = (!defined('IN_ADMIN') && $current_time - $userdata['session_time'] > ($board_config['session_length']+60)) ? ', session_admin = 0' : ''; 344 345 $sql = "UPDATE " . SESSIONS_TABLE . " 346 SET session_time = $current_time, session_page = $thispage_id$update_admin 347 WHERE session_id = '" . $userdata['session_id'] . "'"; 348 if ( !$db->sql_query($sql) ) 349 { 350 message_die(CRITICAL_ERROR, 'Error updating sessions table', '', __LINE__, __FILE__, $sql); 351 } 352 353 if ( $userdata['user_id'] != ANONYMOUS ) 354 { 355 $sql = "UPDATE " . USERS_TABLE . " 356 SET user_session_time = $current_time, user_session_page = $thispage_id 357 WHERE user_id = " . $userdata['user_id']; 358 if ( !$db->sql_query($sql) ) 359 { 360 message_die(CRITICAL_ERROR, 'Error updating sessions table', '', __LINE__, __FILE__, $sql); 361 } 362 } 363 364 session_clean($userdata['session_id']); 365 366 setcookie($cookiename . '_data', serialize($sessiondata), $current_time + 31536000, $cookiepath, $cookiedomain, $cookiesecure); 367 setcookie($cookiename . '_sid', $session_id, 0, $cookiepath, $cookiedomain, $cookiesecure); 368 } 369 370 // Add the session_key to the userdata array if it is set 371 if ( isset($sessiondata['autologinid']) && $sessiondata['autologinid'] != '' ) 372 { 373 $userdata['session_key'] = $sessiondata['autologinid']; 374 } 375 376 return $userdata; 377 } 378 } 379 } 380 381 // 382 // If we reach here then no (valid) session exists. So we'll create a new one, 383 // using the cookie user_id if available to pull basic user prefs. 384 // 385 $user_id = ( isset($sessiondata['userid']) ) ? intval($sessiondata['userid']) : ANONYMOUS; 386 387 if ( !($userdata = session_begin($user_id, $user_ip, $thispage_id, TRUE)) ) 388 { 389 message_die(CRITICAL_ERROR, 'Error creating user session', '', __LINE__, __FILE__, $sql); 390 } 391 392 return $userdata; 393 394 } 395 396 /** 397 * Terminates the specified session 398 * It will delete the entry in the sessions table for this session, 399 * remove the corresponding auto-login key and reset the cookies 400 */ 401 function session_end($session_id, $user_id) 402 { 403 global $db, $lang, $board_config, $userdata; 404 global $HTTP_COOKIE_VARS, $HTTP_GET_VARS, $SID; 405 406 $cookiename = $board_config['cookie_name']; 407 $cookiepath = $board_config['cookie_path']; 408 $cookiedomain = $board_config['cookie_domain']; 409 $cookiesecure = $board_config['cookie_secure']; 410 411 $current_time = time(); 412 413 if (!preg_match('/^[A-Za-z0-9]*$/', $session_id)) 414 { 415 return; 416 } 417 418 // 419 // Delete existing session 420 // 421 $sql = 'DELETE FROM ' . SESSIONS_TABLE . " 422 WHERE session_id = '$session_id' 423 AND session_user_id = $user_id"; 424 if ( !$db->sql_query($sql) ) 425 { 426 message_die(CRITICAL_ERROR, 'Error removing user session', '', __LINE__, __FILE__, $sql); 427 } 428 429 // 430 // Remove this auto-login entry (if applicable) 431 // 432 if ( isset($userdata['session_key']) && $userdata['session_key'] != '' ) 433 { 434 $autologin_key = md5($userdata['session_key']); 435 $sql = 'DELETE FROM ' . SESSIONS_KEYS_TABLE . ' 436 WHERE user_id = ' . (int) $user_id . " 437 AND key_id = '$autologin_key'"; 438 if ( !$db->sql_query($sql) ) 439 { 440 message_die(CRITICAL_ERROR, 'Error removing auto-login key', '', __LINE__, __FILE__, $sql); 441 } 442 } 443 444 // 445 // We expect that message_die will be called after this function, 446 // but just in case it isn't, reset $userdata to the details for a guest 447 // 448 $sql = 'SELECT * 449 FROM ' . USERS_TABLE . ' 450 WHERE user_id = ' . ANONYMOUS; 451 if ( !($result = $db->sql_query($sql)) ) 452 { 453 message_die(CRITICAL_ERROR, 'Error obtaining user details', '', __LINE__, __FILE__, $sql); 454 } 455 if ( !($userdata = $db->sql_fetchrow($result)) ) 456 { 457 message_die(CRITICAL_ERROR, 'Error obtaining user details', '', __LINE__, __FILE__, $sql); 458 } 459 $db->sql_freeresult($result); 460 461 462 setcookie($cookiename . '_data', '', $current_time - 31536000, $cookiepath, $cookiedomain, $cookiesecure); 463 setcookie($cookiename . '_sid', '', $current_time - 31536000, $cookiepath, $cookiedomain, $cookiesecure); 464 465 return true; 466 } 467 468 /** 469 * Removes expired sessions and auto-login keys from the database 470 */ 471 function session_clean($session_id) 472 { 473 global $board_config, $db; 474 475 // 476 // Delete expired sessions 477 // 478 $sql = 'DELETE FROM ' . SESSIONS_TABLE . ' 479 WHERE session_time < ' . (time() - (int) $board_config['session_length']) . " 480 AND session_id <> '$session_id'"; 481 if ( !$db->sql_query($sql) ) 482 { 483 message_die(CRITICAL_ERROR, 'Error clearing sessions table', '', __LINE__, __FILE__, $sql); 484 } 485 486 // 487 // Delete expired auto-login keys 488 // If max_autologin_time is not set then keys will never be deleted 489 // (same behaviour as old 2.0.x session code) 490 // 491 if (!empty($board_config['max_autologin_time']) && $board_config['max_autologin_time'] > 0) 492 { 493 $sql = 'DELETE FROM ' . SESSIONS_KEYS_TABLE . ' 494 WHERE last_login < ' . (time() - (86400 * (int) $board_config['max_autologin_time'])); 495 $db->sql_query($sql); 496 } 497 498 return true; 499 } 500 501 /** 502 * Reset all login keys for the specified user 503 * Called on password changes 504 */ 505 function session_reset_keys($user_id, $user_ip) 506 { 507 global $db, $userdata, $board_config; 508 509 $key_sql = ($user_id == $userdata['user_id'] && !empty($userdata['session_key'])) ? "AND key_id != '" . md5($userdata['session_key']) . "'" : ''; 510 511 $sql = 'DELETE FROM ' . SESSIONS_KEYS_TABLE . ' 512 WHERE user_id = ' . (int) $user_id . " 513 $key_sql"; 514 515 if ( !$db->sql_query($sql) ) 516 { 517 message_die(CRITICAL_ERROR, 'Error removing auto-login keys', '', __LINE__, __FILE__, $sql); 518 } 519 520 $where_sql = 'session_user_id = ' . (int) $user_id; 521 $where_sql .= ($user_id == $userdata['user_id']) ? " AND session_id <> '" . $userdata['session_id'] . "'" : ''; 522 $sql = 'DELETE FROM ' . SESSIONS_TABLE . " 523 WHERE $where_sql"; 524 if ( !$db->sql_query($sql) ) 525 { 526 message_die(CRITICAL_ERROR, 'Error removing user session(s)', '', __LINE__, __FILE__, $sql); 527 } 528 529 if ( !empty($key_sql) ) 530 { 531 $auto_login_key = dss_rand() . dss_rand(); 532 533 $current_time = time(); 534 535 $sql = 'UPDATE ' . SESSIONS_KEYS_TABLE . " 536 SET last_ip = '$user_ip', key_id = '" . md5($auto_login_key) . "', last_login = $current_time 537 WHERE key_id = '" . md5($userdata['session_key']) . "'"; 538 539 if ( !$db->sql_query($sql) ) 540 { 541 message_die(CRITICAL_ERROR, 'Error updating session key', '', __LINE__, __FILE__, $sql); 542 } 543 544 // And now rebuild the cookie 545 $sessiondata['userid'] = $user_id; 546 $sessiondata['autologinid'] = $auto_login_key; 547 $cookiename = $board_config['cookie_name']; 548 $cookiepath = $board_config['cookie_path']; 549 $cookiedomain = $board_config['cookie_domain']; 550 $cookiesecure = $board_config['cookie_secure']; 551 552 setcookie($cookiename . '_data', serialize($sessiondata), $current_time + 31536000, $cookiepath, $cookiedomain, $cookiesecure); 553 554 $userdata['session_key'] = $auto_login_key; 555 unset($sessiondata); 556 unset($auto_login_key); 557 } 558 } 559 560 // 561 // Append $SID to a url. Borrowed from phplib and modified. This is an 562 // extra routine utilised by the session code above and acts as a wrapper 563 // around every single URL and form action. If you replace the session 564 // code you must include this routine, even if it's empty. 565 // 566 function append_sid($url, $non_html_amp = false) 567 { 568 global $SID; 569 570 if ( !empty($SID) && !preg_match('#sid=#', $url) ) 571 { 572 $url .= ( ( strpos($url, '?') !== false ) ? ( ( $non_html_amp ) ? '&' : '&' ) : '?' ) . $SID; 573 } 574 575 return $url; 576 } 577 578 ?>
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| Generated: Mon Jan 14 19:21:40 2013 | Cross-referenced by PHPXref 0.7.1 |