include/init.php

   1 <?php
   2
   3 /**
   4  * init.php -- initialisation file
   5  *
   6  * File should be loaded in every file in src/ or plugins that occupate an entire frame
   7  *
   8  * @copyright 2006-2010 The SquirrelMail Project Team
   9  * @license http://opensource.org/licenses/gpl-license.php GNU Public License
  10  * @version $Id$
  11  * @package squirrelmail
  12  */
  13
  14 /**
  15  * This is a development version so in order to track programmer mistakes we
  16  * set the error reporting to E_ALL
  17 FIXME: disabling this for now, because we now have $sm_debug_mode, but the problem with that is that we don't know what it will be until we have loaded the config file, a good 175 lines below after several important files have been included, etc.  For now, we'll trust that developers have turned on E_ALL in php.ini anyway, but this can be uncommented if not.
  18  */
  19 //error_reporting(E_ALL);
  20
  21
  22 /**
  23  * Make sure we have a page name
  24  *
  25  */
  26 if ( !defined('PAGE_NAME') ) define('PAGE_NAME', NULL);
  27
  28
  29 /**
  30  * If register_globals are on, unregister globals.
  31  * Second test covers boolean set as string (php_value register_globals off).
  32  */
  33 if ((bool) ini_get('register_globals') &&
  34     strtolower(ini_get('register_globals'))!='off') {
  35     /**
  36      * Remove all globals that are not reserved by PHP
  37      * 'value' and 'key' are used by foreach. Don't unset them inside foreach.
  38      */
  39     foreach ($GLOBALS as $key => $value) {
  40         switch($key) {
  41         case 'HTTP_POST_VARS':
  42         case '_POST':
  43         case 'HTTP_GET_VARS':
  44         case '_GET':
  45         case 'HTTP_COOKIE_VARS':
  46         case '_COOKIE':
  47         case 'HTTP_SERVER_VARS':
  48         case '_SERVER':
  49         case 'HTTP_ENV_VARS':
  50         case '_ENV':
  51         case 'HTTP_POST_FILES':
  52         case '_FILES':
  53         case '_REQUEST':
  54         case 'HTTP_SESSION_VARS':
  55         case '_SESSION':
  56         case 'GLOBALS':
  57         case 'key':
  58         case 'value':
  59             break;
  60         default:
  61             unset($GLOBALS[$key]);
  62         }
  63     }
  64     // Unset variables used in foreach
  65     unset($GLOBALS['key']);
  66     unset($GLOBALS['value']);
  67 }
  68
  69 /**
  70  * Used as a dummy value, e.g., for passing as an empty
  71  * hook argument (where the value is passed by reference,
  72  * and therefore NULL itself is not acceptable).
  73  */
  74 global $null;
  75 $null = NULL;
  76
  77 /**
  78  * The global $server_os variable will be "windows" if
  79  * we are working in a Windows environment or "*nix"
  80  * otherwise.
  81  */
  82 global $server_os;
  83 if (DIRECTORY_SEPARATOR == '\\') $server_os = 'windows'; else $server_os = '*nix';
  84
  85 /**
  86  * [#1518885] session.use_cookies = off breaks SquirrelMail
  87  *
  88  * When session cookies are not used, all http redirects, meta refreshes,
  89  * src/download.php and javascript URLs are broken. Setting must be set
  90  * before session is started.
  91  */
  92 if (!(bool)ini_get('session.use_cookies') ||
  93     ini_get('session.use_cookies') == 'off') {
  94     ini_set('session.use_cookies','1');
  95 }
  96
  97 /**
  98  * Initialize seed of random number generator.
  99  * We use a number of things to randomize input: current time in ms,
 100  * info about the remote client, info about the current process, the
 101  * randomness of uniqid and stat of the current file.
 102  *
 103  * We seed this here only once per init, not only to save cycles
 104  * but also to make the result of mt_rand more random (it now also
 105  * depends on the number of times mt_rand was called before in this
 106  * execution.
 107  */
 108 $seed = microtime() . $_SERVER['REMOTE_PORT'] . $_SERVER['REMOTE_ADDR'] . getmypid();
 109
 110 if (function_exists('getrusage')) {
 111     /* Avoid warnings with Win32 */
 112     $dat = @getrusage();
 113     if (isset($dat) && is_array($dat)) { $seed .= implode('', $dat); }
 114 }
 115
 116 if(!empty($_SERVER['UNIQUE_ID'])) {
 117     $seed .= $_SERVER['UNIQUE_ID'];
 118 }
 119
 120 $seed .= uniqid(mt_rand(),TRUE);
 121 $seed .= implode('', stat( __FILE__));
 122
 123 // mt_srand() uses an integer to seed, so we need to distill our
 124 // very large seed to something useful (without taking a sub-string,
 125 // the integer conversion of such a large number is always 0 on
 126 // many systems, but strangely, 9 hex numbers - even if larger
 127 // than a signed 32 bit integer - seem to be an acceptable "integer"
 128 // seed (perhaps it is used as unsigned?)...
 129 // we may want to revisit this and always force it to be less than
 130 // 2,147,483,647
 131 //
 132 $seed = hexdec(substr(md5($seed), 0, 9));
 133
 134 // PHP 4.2 and up don't require seeding, but their used seed algorithm
 135 // is of questionable quality, so we keep doing it ourselves. */
 136 mt_srand($seed);
 137
 138 /**
 139  * calculate SM_PATH and calculate the base_uri
 140  * assumptions made: init.php is only called from plugins or from the src dir.
 141  * files in the plugin directory may not be part of a subdirectory called "src"
 142  *
 143  */
 144 if (isset($_SERVER['SCRIPT_NAME'])) {
 145     $a = explode('/', $_SERVER['SCRIPT_NAME']);
 146 } elseif (isset($HTTP_SERVER_VARS['SCRIPT_NAME'])) {
 147     $a = explode('/', $HTTP_SERVER_VARS['SCRIPT_NAME']);
 148 } else {
 149     $error = 'Unable to detect script environment. Please test your PHP '
 150            . 'settings and send your PHP core configuration, $_SERVER and '
 151            . '$HTTP_SERVER_VARS contents to the SquirrelMail developers.';
 152     die($error);
 153 }
 154 $sSM_PATH = '';
 155 for($i = count($a) -2; $i > -1; --$i) {
 156     $sSM_PATH .= '../';
 157     if ($a[$i] === 'src' || $a[$i] === 'plugins') {
 158         break;
 159     }
 160 }
 161
 162 $base_uri = implode('/', array_slice($a, 0, $i)). '/';
 163
 164 define('SM_PATH',$sSM_PATH);
 165 define('SM_BASE_URI', $base_uri);
 166
 167
 168 /**
 169  * global var $bInit is used to check if initialisation took place.
 170  * At this moment it's a workarounf for the include of addrbook_search_html
 171  * inside compose.php. If we found a better way then remove this. Do only use
 172  * this var if you know for sure a page can be called stand alone and be included
 173  * in another file.
 174  */
 175 $bInit = true;
 176
 177 /**
 178  * This theme as a failsafe if no themes were found, or if we error
 179  * out before anything could be initialised.
 180  */
 181 $color = array();
 182 $color[0]  = '#DCDCDC';  /* light gray    TitleBar               */
 183 $color[1]  = '#800000';  /* red                                  */
 184 $color[2]  = '#CC0000';  /* light red     Warning/Error Messages */
 185 $color[3]  = '#A0B8C8';  /* green-blue    Left Bar Background    */
 186 $color[4]  = '#FFFFFF';  /* white         Normal Background      */
 187 $color[5]  = '#FFFFCC';  /* light yellow  Table Headers          */
 188 $color[6]  = '#000000';  /* black         Text on left bar       */
 189 $color[7]  = '#0000CC';  /* blue          Links                  */
 190 $color[8]  = '#000000';  /* black         Normal text            */
 191 $color[9]  = '#ABABAB';  /* mid-gray      Darker version of #0   */
 192 $color[10] = '#666666';  /* dark gray     Darker version of #9   */
 193 $color[11] = '#770000';  /* dark red      Special Folders color  */
 194 $color[12] = '#EDEDED';
 195 $color[13] = '#800000';  /* (dark red)    Color for quoted text -- > 1 quote */
 196 $color[14] = '#ff0000';  /* (red)         Color for quoted text -- >> 2 or more */
 197 $color[15] = '#002266';  /* (dark blue)   Unselectable folders */
 198 $color[16] = '#ff9933';  /* (orange)      Highlight color */
 199
 200 require(SM_PATH . 'include/constants.php');
 201 require(SM_PATH . 'functions/global.php');
 202 require(SM_PATH . 'functions/strings.php');
 203 require(SM_PATH . 'functions/arrays.php');
 204 require(SM_PATH . 'functions/files.php');
 205
 206 /* load default configuration */
 207 require(SM_PATH . 'config/config_default.php');
 208 /* reset arrays in default configuration */
 209 $ldap_server = array();
 210 $plugins = array();
 211 $fontsets = array();
 212 $aTemplateSet = array();
 213 $aTemplateSet[0]['ID'] = 'default';
 214 $aTemplateSet[0]['NAME'] = 'Default';
 215
 216 /* load site configuration */
 217 require(SM_PATH . 'config/config.php');
 218 /* load local configuration overrides */
 219 if (file_exists(SM_PATH . 'config/config_local.php')) {
 220     require(SM_PATH . 'config/config_local.php');
 221 }
 222
 223
 224 /**
 225  * Set PHP error reporting level based on the SquirrelMail debug mode
 226  */
 227 $error_level = 0;
 228 if ($sm_debug_mode & SM_DEBUG_MODE_SIMPLE)
 229     $error_level |= E_ERROR;
 230 if ($sm_debug_mode & SM_DEBUG_MODE_MODERATE
 231  || $sm_debug_mode & SM_DEBUG_MODE_ADVANCED)
 232     $error_level |= E_ALL;
 233 if ($sm_debug_mode & SM_DEBUG_MODE_STRICT)
 234     $error_level |= E_STRICT;
 235 error_reporting($error_level);
 236
 237
 238 /**
 239  * Detect SSL connections
 240  */
 241 $is_secure_connection = is_ssl_secured_connection();
 242
 243
 244 require(SM_PATH . 'functions/plugin.php');
 245 require(SM_PATH . 'include/languages.php');
 246 require(SM_PATH . 'class/template/Template.class.php');
 247 require(SM_PATH . 'class/error.class.php');
 248
 249 /**
 250  * If magic_quotes_runtime is on, SquirrelMail breaks in new and creative ways.
 251  * Force magic_quotes_runtime off.
 252  * tassium@squirrelmail.org - I put it here in the hopes that all SM code includes this.
 253  * If there's a better place, please let me know.
 254  */
 255 ini_set('magic_quotes_runtime','0');
 256
 257
 258 /* if running with magic_quotes_gpc then strip the slashes
 259    from POST and GET global arrays */
 260 if (function_exists('get_magic_quotes_gpc') && @get_magic_quotes_gpc()) {
 261     sqstripslashes($_GET);
 262     sqstripslashes($_POST);
 263 }
 264
 265
 266 /**
 267  * Strip any tags added to the url from PHP_SELF.
 268  * This fixes hand crafted url XXS expoits for any
 269  * page that uses PHP_SELF as the FORM action
 270  * Update: strip_tags() won't catch something like
 271  * src/right_main.php?sort=0&startMessage=1&mailbox=INBOX&xxx="><script>window.open("http://example.com")</script>
 272  * or
 273  * contrib/decrypt_headers.php/%22%20onmouseover=%22alert(%27hello%20world%27)%22%3E
 274  * because it doesn't bother with broken tags.
 275  * htmlspecialchars() is the preferred method.
 276  * QUERY_STRING also needs the same treatment since it is
 277  * used in php_self().
 278  */
 279 if (isset($_SERVER['REQUEST_URI']))
 280     $_SERVER['REQUEST_URI'] = htmlspecialchars($_SERVER['REQUEST_URI']);
 281 if (isset($_SERVER['PHP_SELF']))
 282     $_SERVER['PHP_SELF'] = htmlspecialchars($_SERVER['PHP_SELF']);
 283 if (isset($_SERVER['QUERY_STRING']))
 284     $_SERVER['QUERY_STRING'] = htmlspecialchars($_SERVER['QUERY_STRING']);
 285
 286 $PHP_SELF = php_self();
 287
 288 /**
 289  * Initialize the session
 290  */
 291
 292 /** set the name of the session cookie */
 293 if (!isset($session_name) || !$session_name) {
 294     $session_name = 'SQMSESSID';
 295 }
 296
 297 /**
 298  * When session.auto_start is On we want to destroy/close the session
 299  */
 300 $sSessionAutostartName = session_name();
 301 $sSessionAutostartID = session_id();
 302 if (!empty($sSessionAutostartID) && $sSessionAutostartName !== $session_name) {
 303     $sCookiePath = ini_get('session.cookie_path');
 304     $sCookieDomain = ini_get('session.cookie_domain');
 305     // reset the cookie
 306     sqsetcookie($sSessionAutostartName,'',1,$sCookiePath,$sCookieDomain);
 307     @session_destroy();
 308     session_write_close();
 309 }
 310
 311 /**
 312  * includes from classes stored in the session
 313  */
 314 require(SM_PATH . 'class/mime.class.php');
 315
 316 ini_set('session.name' , $session_name);
 317 session_set_cookie_params (0, $base_uri);
 318 sqsession_is_active();
 319
 320 /**
 321  * When on login page, have to reset the user session, making
 322  * sure to save session restore data first
 323  */
 324 if (PAGE_NAME == 'login') {
 325     if (!sqGetGlobalVar('session_expired_post', $sep, SQ_SESSION))
 326         $sep = '';
 327     if (!sqGetGlobalVar('session_expired_location', $sel, SQ_SESSION))
 328         $sel = '';
 329     sqsession_destroy();
 330     session_write_close();
 331
 332     /**
 333      * in some rare instances, the session seems to stick
 334      * around even after destroying it (!!), so if it does,
 335      * we'll manually flatten the $_SESSION data
 336      */
 337     if (!empty($_SESSION))
 338         $_SESSION = array();
 339
 340     /**
 341      * Allow administrators to define custom session handlers
 342      * for SquirrelMail without needing to change anything in
 343      * php.ini (application-level).
 344      *
 345      * In config_local.php, admin needs to put:
 346      *
 347      *     $custom_session_handlers = array(
 348      *         'my_open_handler',
 349      *         'my_close_handler',
 350      *         'my_read_handler',
 351      *         'my_write_handler',
 352      *         'my_destroy_handler',
 353      *         'my_gc_handler',
 354      *     );
 355      *     session_module_name('user');
 356      *     session_set_save_handler(
 357      *         $custom_session_handlers[0],
 358      *         $custom_session_handlers[1],
 359      *         $custom_session_handlers[2],
 360      *         $custom_session_handlers[3],
 361      *         $custom_session_handlers[4],
 362      *         $custom_session_handlers[5]
 363      *     );
 364      *
 365      * We need to replicate that code once here because PHP has
 366      * long had a bug that resets the session handler mechanism
 367      * when the session data is also destroyed.  Because of this
 368      * bug, even administrators who define custom session handlers
 369      * via a PHP pre-load defined in php.ini (auto_prepend_file)
 370      * will still need to define the $custom_session_handlers array
 371      * in config_local.php.
 372      */
 373     global $custom_session_handlers;
 374     if (!empty($custom_session_handlers)) {
 375         $open    = $custom_session_handlers[0];
 376         $close   = $custom_session_handlers[1];
 377         $read    = $custom_session_handlers[2];
 378         $write   = $custom_session_handlers[3];
 379         $destroy = $custom_session_handlers[4];
 380         $gc      = $custom_session_handlers[5];
 381         session_module_name('user');
 382         session_set_save_handler($open, $close, $read, $write, $destroy, $gc);
 383     }
 384
 385     sqsession_is_active();
 386     session_regenerate_id();
 387
 388     // put session restore data back into session if necessary
 389     if (!empty($sel)) {
 390         sqsession_register($sel, 'session_expired_location');
 391         if (!empty($sep))
 392             sqsession_register($sep, 'session_expired_post');
 393     }
 394 }
 395
 396 /**
 397  * SquirrelMail internal version number -- DO NOT CHANGE
 398  * $sm_internal_version = array (release, major, minor)
 399  */
 400 $SQM_INTERNAL_VERSION = explode('.', SM_VERSION, 3);
 401 $SQM_INTERNAL_VERSION[2] = intval($SQM_INTERNAL_VERSION[2]);
 402
 403
 404 /* load prefs system; even when user not logged in, should be OK to do this here */
 405 require(SM_PATH . 'functions/prefs.php');
 406
 407
 408 /* if plugins are disabled only for one user and
 409  * the current user is NOT that user, turn them
 410  * back on
 411  */
 412 sqgetGlobalVar('username', $username, SQ_SESSION);
 413 if ($disable_plugins && !empty($disable_plugins_user)
 414  && $username != $disable_plugins_user) {
 415     $disable_plugins = false;
 416 }
 417
 418
 419 /* remove all plugins if they are disabled */
 420 if ($disable_plugins) {
 421    $plugins = array();
 422 }
 423
 424
 425 /**
 426  * Include Compatibility plugin if available.
 427  */
 428 if (!$disable_plugins && file_exists(SM_PATH . 'plugins/compatibility/functions.php'))
 429     include_once(SM_PATH . 'plugins/compatibility/functions.php');
 430
 431
 432 /**
 433  * MAIN PLUGIN LOADING CODE HERE
 434  * On init, we no longer need to load all plugin setup files.
 435  * Now, we load the statically generated hook registrations here
 436  * and let the hook calls include only the plugins needed.
 437  */
 438 $squirrelmail_plugin_hooks = array();
 439 if (!$disable_plugins && file_exists(SM_PATH . 'config/plugin_hooks.php')) {
 440 //FIXME: if we keep the plugin hooks array static like this, it seems like we should also keep the template files list in a static file too (when a new user session is started or the template set is changed, the code will dynamically iterate through the directory heirarchy of the template directory and catalog all the template files therein (and store the "catalog" in PHP session) -- instead, we could do that once at config-time and keep that static so SM can just include the file just like the line below)
 441     require(SM_PATH . 'config/plugin_hooks.php');
 442 }
 443
 444
 445 /**
 446  * Plugin authors note that the "config_override" hook used to be
 447  * executed here, but please adapt your plugin to use this "prefs_backend"
 448  * hook instead, making sure that it does NOT return anything, since
 449  * doing so will interfere with proper prefs system functionality.
 450  * Of course, otherwise, this hook may be used to do any configuration
 451  * overrides as needed, as well as set up a custom preferences backend.
 452  */
 453 $prefs_backend = do_hook('prefs_backend', $null);
 454 if (isset($prefs_backend) && !empty($prefs_backend) && file_exists(SM_PATH . $prefs_backend)) {
 455     require(SM_PATH . $prefs_backend);
 456 } elseif (isset($prefs_dsn) && !empty($prefs_dsn)) {
 457     require(SM_PATH . 'functions/db_prefs.php');
 458 } else {
 459     require(SM_PATH . 'functions/file_prefs.php');
 460 }
 461
 462
 463
 464 /**
 465  * DISABLED.
 466  * Remove globalized session data in rg=on setups
 467  *
 468  * Code can be utilized when session is started, but data is not loaded.
 469  * We have already loaded configuration and other important vars. Can't
 470  * clean session globals here, beside, the cleanout of globals at the
 471  * top of this file will have removed anything this code would find anyway.
 472 if ((bool) @ini_get('register_globals') &&
 473     strtolower(ini_get('register_globals'))!='off') {
 474     foreach ($_SESSION as $key => $value) {
 475         unset($GLOBALS[$key]);
 476     }
 477 }
 478 */
 479
 480 sqsession_register(SM_BASE_URI,'base_uri');
 481
 482 /**
 483  * Retrieve the language cookie
 484  */
 485 if (! sqgetGlobalVar('squirrelmail_language',$squirrelmail_language,SQ_COOKIE)) {
 486     $squirrelmail_language = '';
 487 }
 488
 489
 490 /**
 491  * In some cases, buffering all output allows more complex functionality,
 492  * especially for plugins that want to add headers on hooks that are beyond
 493  * the point of output having been sent to the browser otherwise.
 494  *
 495  * Note that we don't turn this on any earlier since we want to allow plugins
 496  * to turn it on themselves via a configuration override on the prefs_backend
 497  * hook.
 498  *
 499  */
 500 if ($buffer_output) ob_start(!empty($buffered_output_handler) ? $buffered_output_handler : NULL);
 501
 502
 503 /**
 504  * Do something special for some pages. This is based on the PAGE_NAME constant
 505  * set at the top of every page.
 506  */
 507 $set_up_langage_after_template_setup = FALSE;
 508 switch (PAGE_NAME) {
 509     case 'style':
 510
 511         // need to get the right template set up
 512         //
 513         sqGetGlobalVar('templateid', $templateid, SQ_GET);
 514
 515         // sanitize just in case...
 516         //
 517         $templateid = preg_replace('/(\.\.\/){1,}/', '', $templateid);
 518
 519         // make sure given template actually is available
 520         //
 521         $found_templateset = false;
 522         for ($i = 0; $i < count($aTemplateSet); ++$i) {
 523             if ($aTemplateSet[$i]['ID'] == $templateid) {
 524                 $found_templateset = true;
 525                 break;
 526             }
 527         }
 528
 529 // FIXME: do we need/want to check here for actual (physical) presence of template sets?
 530         // selected template not available, fall back to default template
 531         //
 532         if (!$found_templateset) {
 533             $sTemplateID = Template::get_default_template_set();
 534         } else {
 535             $sTemplateID = $templateid;
 536         }
 537
 538         session_write_close();
 539         break;
 540
 541     case 'mailto':
 542         // nothing to do
 543         break;
 544
 545     case 'redirect':
 546         require(SM_PATH . 'functions/auth.php');
 547         //nobreak;
 548
 549     case 'login':
 550         require(SM_PATH . 'functions/display_messages.php' );
 551         require(SM_PATH . 'functions/page_header.php');
 552         require(SM_PATH . 'functions/html.php');
 553
 554         // reset template file cache
 555         //
 556         $sTemplateID = Template::get_default_template_set();
 557         Template::cache_template_file_hierarchy($sTemplateID, TRUE);
 558
 559         /**
 560          * Make sure icon variables are setup for the login page.
 561          */
 562         $icon_theme = $icon_themes[$icon_theme_def]['PATH'];
 563         /*
 564          * NOTE: The $icon_theme_path var should contain the path to the icon
 565          *       theme to use.  If the admin has disabled icons, or the user has
 566          *       set the icon theme to "None," no icons will be used.
 567          */
 568         $icon_theme_path = (!$use_icons || $icon_theme=='none') ? NULL : ($icon_theme == 'template' ? SM_PATH . Template::calculate_template_images_directory($sTemplateID) : $icon_theme);
 569
 570         break;
 571     default:
 572         require(SM_PATH . 'functions/display_messages.php' );
 573         require(SM_PATH . 'functions/page_header.php');
 574         require(SM_PATH . 'functions/html.php');
 575
 576
 577         /**
 578          * Check if we are logged in and does optional referrer check
 579          */
 580         require(SM_PATH . 'functions/auth.php');
 581
 582         global $check_referrer, $domain;
 583         if (!sqgetGlobalVar('HTTP_REFERER', $referrer, SQ_SERVER)) $referrer = '';
 584         if ($check_referrer == '###DOMAIN###') $check_referrer = $domain;
 585         if (!empty($check_referrer)) {
 586             $ssl_check_referrer = 'https://' . $check_referrer;
 587             $check_referrer = 'http://' . $check_referrer;
 588         }
 589         if (!sqsession_is_registered('user_is_logged_in')
 590          || ($check_referrer && !empty($referrer)
 591           && strpos(strtolower($referrer), strtolower($check_referrer)) !== 0
 592           && strpos(strtolower($referrer), strtolower($ssl_check_referrer)) !== 0)) {
 593
 594             // use $message to indicate what logout text the user
 595             // will see... if 0, typical "You must be logged in"
 596             // if 1, information that the user session was saved
 597             // and will be resumed after (re)login, if 2, there
 598             // seems to have been a XSS or phishing attack (bad
 599             // referrer)
 600             //
 601             $message = 0;
 602
 603             //  First we store some information in the new session to prevent
 604             //  information-loss.
 605             //
 606             $session_expired_post = $_POST;
 607             $session_expired_location = PAGE_NAME;
 608             if (!sqsession_is_registered('session_expired_post')) {
 609                 sqsession_register($session_expired_post,'session_expired_post');
 610             }
 611             if (!sqsession_is_registered('session_expired_location')) {
 612                 sqsession_register($session_expired_location,'session_expired_location');
 613                 if ($session_expired_location == 'compose')
 614                     $message = 1;
 615             }
 616
 617             // was bad referrer the reason we were rejected?
 618             //
 619             if (sqsession_is_registered('user_is_logged_in')
 620              && $check_referrer && !empty($referrer))
 621                 $message = 2;
 622
 623             // signout page will deal with users who aren't logged
 624             // in on its own; don't show error here
 625             //
 626             if ( PAGE_NAME == 'signout' ) {
 627                 return;
 628             }
 629
 630             /**
 631              * Initialize the template object (logout_error uses it)
 632              */
 633             /*
 634              * $sTemplateID is not initialized when a user is not logged in, so we
 635              * will use the config file defaults here.  If the neccesary variables
 636              * are not set, force a default value.
 637              */
 638             if (PAGE_NAME == 'squirrelmail_rpc') {
 639                 $sTemplateID = Template::get_rpc_template_set();
 640             } else {
 641                 $sTemplateID = Template::get_default_template_set();
 642             }
 643             $oTemplate = Template::construct_template($sTemplateID);
 644
 645             set_up_language($squirrelmail_language, true);
 646             if (!$message)
 647                 logout_error( _("You must be logged in to access this page.") );
 648             else if ($message == 1)
 649                 logout_error( _("Your session has expired, but will be resumed after logging in again.") );
 650             else if ($message == 2)
 651                 logout_error( _("The current page request appears to have originated from an unrecognized source.") );
 652             exit;
 653         }
 654
 655         sqgetGlobalVar('authz',$authz,SQ_SESSION);
 656
 657         /**
 658          * Setting the prefs backend
 659          */
 660         sqgetGlobalVar('prefs_cache', $prefs_cache, SQ_SESSION );
 661         sqgetGlobalVar('prefs_are_cached', $prefs_are_cached, SQ_SESSION );
 662
 663         if ( !sqsession_is_registered('prefs_are_cached') ||
 664             !isset( $prefs_cache) ||
 665             !is_array( $prefs_cache)) {
 666             $prefs_are_cached = false;
 667             $prefs_cache = false; //array();
 668         }
 669
 670         /**
 671          * initializing user settings
 672          */
 673         require(SM_PATH . 'include/load_prefs.php');
 674
 675         /**
 676          * We'll need this to later have a noframes version
 677          *
 678          * Check if the user has a language preference, but no cookie.
 679          * Send him a cookie with his language preference, if there is
 680          * such discrepancy.
 681          */
 682          $my_language = getPref($data_dir, $username, 'language');
 683          if ($my_language != $squirrelmail_language) {
 684              sqsetcookie('squirrelmail_language', $my_language, time()+2592000, $base_uri);
 685          }
 686
 687         $set_up_langage_after_template_setup = TRUE;
 688
 689         $timeZone = getPref($data_dir, $username, 'timezone');
 690
 691         /* Check to see if we are allowed to set the TZ environment variable.
 692          * We are able to do this if ...
 693          *   safe_mode is disabled OR
 694          *   safe_mode_allowed_env_vars is empty (you are allowed to set any) OR
 695          *   safe_mode_allowed_env_vars contains TZ
 696          */
 697         $tzChangeAllowed = (!ini_get('safe_mode')) ||
 698                             !strcmp(ini_get('safe_mode_allowed_env_vars'),'') ||
 699                             preg_match('/^([\w_]+,)*TZ/', ini_get('safe_mode_allowed_env_vars'));
 700
 701         if ( $timeZone != SMPREF_NONE && ($timeZone != "")
 702             && $tzChangeAllowed ) {
 703
 704             // get time zone key, if strict or custom strict timezones are used
 705             if (isset($time_zone_type) &&
 706                 ($time_zone_type == 1 || $time_zone_type == 3)) {
 707                 /* load time zone functions */
 708                 require(SM_PATH . 'include/timezones.php');
 709                 $realTimeZone = sq_get_tz_key($timeZone);
 710             } else {
 711                 $realTimeZone = $timeZone;
 712             }
 713
 714             // set time zone
 715             if ($realTimeZone) {
 716                 putenv("TZ=".$realTimeZone);
 717             }
 718         }
 719
 720         /**
 721          * php 5.1.0 added time zone functions. Set time zone with them in order
 722          * to prevent E_STRICT notices and allow time zone modifications in safe_mode.
 723          */
 724         if (function_exists('date_default_timezone_set')) {
 725             if ($timeZone != SMPREF_NONE && $timeZone != "") {
 726                 date_default_timezone_set($timeZone);
 727             } else {
 728                 // interface runs on server's time zone. Remove php E_STRICT complains
 729                 $default_timezone = @date_default_timezone_get();
 730                 date_default_timezone_set($default_timezone);
 731             }
 732         }
 733         break;
 734 }
 735
 736 /*
 737  * $sTemplateID is not initialized when a user is not logged in, so we
 738  * will use the config file defaults here.  If the neccesary variables
 739  * are not set, force a default value.
 740  *
 741  * If the user is logged in, $sTemplateID will be set in load_prefs.php,
 742  * so we shouldn't change it here.
 743  */
 744 if (!isset($sTemplateID)) {
 745     if (PAGE_NAME == 'squirrelmail_rpc') {
 746         $sTemplateID = Template::get_rpc_template_set();
 747     } else {
 748         $sTemplateID = Template::get_default_template_set();
 749     }
 750     $icon_theme_path = !$use_icons ? NULL : Template::calculate_template_images_directory($sTemplateID);
 751 }
 752
 753 // template object may have already been constructed in load_prefs.php
 754 //
 755 if (empty($oTemplate)) {
 756     $oTemplate = Template::construct_template($sTemplateID);
 757 }
 758
 759 // We want some variables to always be available to the template
 760 //
 761 $oTemplate->assign('javascript_on',
 762     (sqGetGlobalVar('user_is_logged_in', $user_is_logged_in, SQ_SESSION)
 763      ?  checkForJavascript() : 0));
 764 $oTemplate->assign('base_uri', sqm_baseuri());
 765 $always_include = array('sTemplateID', 'icon_theme_path');
 766 foreach ($always_include as $var) {
 767     $oTemplate->assign($var, (isset($$var) ? $$var : NULL));
 768 }
 769
 770 // A few output elements are used often, so just get them once here
 771 //
 772 $nbsp = $oTemplate->fetch('non_breaking_space.tpl');
 773 $br = $oTemplate->fetch('line_break.tpl');
 774
 775
 776 /**
 777  * Set up the language.
 778  *
 779  * This code block corresponds to the *default* block of the switch
 780  * statement above, but the language cannot be set up until after the
 781  * template is instantiated, so we set $set_up_langage_after_template_setup
 782  * above and do the linguistic stuff now.
 783  */
 784 if ($set_up_langage_after_template_setup) {
 785     $err=set_up_language(getPref($data_dir, $username, 'language'));
 786
 787     // Japanese translation used without mbstring support
 788     if ($err==2) {
 789         $sError = "<p>Your administrator needs to have PHP installed with the multibyte string extension enabled (using configure option --enable-mbstring).</p>\n"
 790                 . "<p>This system has assumed that you accidently switched to Japanese and has reverted your language preference to English.</p>\n"
 791                 . "<p>Please refresh this page in order to continue using your webmail.</p>\n";
 792         error_box($sError);
 793     }
 794 }
 795
 796
 797 /**
 798  * Initialize our custom error handler object
 799  */
 800 $oErrorHandler = new ErrorHandler($oTemplate,'error_message.tpl');
 801
 802
 803 /**
 804  * Activate custom error handling
 805  */
 806 if (version_compare(PHP_VERSION, "4.3.0", ">=")) {
 807     $oldErrorHandler = set_error_handler(array($oErrorHandler, 'SquirrelMailErrorhandler'));
 808 } else {
 809     $oldErrorHandler = set_error_handler('SquirrelMailErrorhandler');
 810 }
 811
 812
 813 // ============================================================================
 814 // ================= End of Live Code, Beginning of Functions =================
 815 // ============================================================================
 816
 817
 818 /**
 819  * Javascript support detection function
 820  * @param boolean $reset recheck javascript support if set to true.
 821  * @return integer SMPREF_JS_ON or SMPREF_JS_OFF ({@see include/constants.php})
 822  * @since 1.5.1
 823  */
 824 function checkForJavascript($reset = FALSE) {
 825   global $data_dir, $username, $javascript_on, $javascript_setting;
 826
 827   if ( !$reset && sqGetGlobalVar('javascript_on', $javascript_on, SQ_SESSION) )
 828     return $javascript_on;
 829
 830   //FIXME: this isn't used anywhere else in this function; can we remove it?  why is it here?
 831   $user_is_logged_in = FALSE;
 832   if ( $reset || !isset($javascript_setting) )
 833     $javascript_setting = getPref($data_dir, $username, 'javascript_setting', SMPREF_JS_AUTODETECT);
 834
 835   if ( !sqGetGlobalVar('new_js_autodetect_results', $js_autodetect_results) &&
 836        !sqGetGlobalVar('js_autodetect_results', $js_autodetect_results) )
 837     $js_autodetect_results = SMPREF_JS_OFF;
 838
 839   if ( $javascript_setting == SMPREF_JS_AUTODETECT )
 840     $javascript_on = $js_autodetect_results;
 841   else
 842     $javascript_on = $javascript_setting;
 843
 844   sqsession_register($javascript_on, 'javascript_on');
 845   return $javascript_on;
 846 }
 847
 848 function sqm_baseuri() {
 849     global $base_uri;
 850     return $base_uri;
 851 }