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 2006-2012 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($_POST);
 263 }
 264
 265
 266 /**
 267  * Strip any tags added to the url from PHP_SELF.
 268  * This fixes hand crafted url XXS expoits for any
 269  * page that uses PHP_SELF as the FORM action
 270  * Update: strip_tags() won't catch something like
 271  * src/right_main.php?sort=0&startMessage=1&mailbox=INBOX&xxx="><script>window.open("http://example.com")</script>
 272  * or
 273  * contrib/decrypt_headers.php/%22%20onmouseover=%22alert(%27hello%20world%27)%22%3E
 274  * because it doesn't bother with broken tags.
 275  * htmlspecialchars() is the preferred method.
 276  * QUERY_STRING also needs the same treatment since it is
 277  * used in php_self().
 278  * Update again: the encoding of ampersands that occurs
 279  * using htmlspecialchars() corrupts the query strings
 280  * in normal URIs, so we have to let those through.
 281 FIXME: will the de-sanitizing of ampersands create any security/XSS problems?
 282  */
 283 if (isset($_SERVER['REQUEST_URI']))
 284     $_SERVER['REQUEST_URI'] = str_replace('&amp;', '&', htmlspecialchars($_SERVER['REQUEST_URI']));
 285 if (isset($_SERVER['PHP_SELF']))
 286     $_SERVER['PHP_SELF'] = str_replace('&amp;', '&', htmlspecialchars($_SERVER['PHP_SELF']));
 287 if (isset($_SERVER['QUERY_STRING']))
 288     $_SERVER['QUERY_STRING'] = str_replace('&amp;', '&', htmlspecialchars($_SERVER['QUERY_STRING']));
 289
 290 $PHP_SELF = php_self();
 291
 292 /**
 293  * Initialize the session
 294  */
 295
 296 /** set the name of the session cookie */
 297 if (!isset($session_name) || !$session_name) {
 298     $session_name = 'SQMSESSID';
 299 }
 300
 301 /**
 302  * When session.auto_start is On we want to destroy/close the session
 303  */
 304 $sSessionAutostartName = session_name();
 305 $sSessionAutostartID = session_id();
 306 if (!empty($sSessionAutostartID) && $sSessionAutostartName !== $session_name) {
 307     $sCookiePath = ini_get('session.cookie_path');
 308     $sCookieDomain = ini_get('session.cookie_domain');
 309     // reset the cookie
 310     sqsetcookie($sSessionAutostartName,'',1,$sCookiePath,$sCookieDomain);
 311     @session_destroy();
 312     session_write_close();
 313 }
 314
 315 /**
 316  * includes from classes stored in the session
 317  */
 318 require(SM_PATH . 'class/mime.class.php');
 319
 320 ini_set('session.name' , $session_name);
 321 session_set_cookie_params (0, $base_uri);
 322 sqsession_is_active();
 323
 324 /**
 325  * When on login page, have to reset the user session, making
 326  * sure to save session restore data first
 327  */
 328 if (PAGE_NAME == 'login') {
 329     if (!sqGetGlobalVar('session_expired_post', $sep, SQ_SESSION))
 330         $sep = '';
 331     if (!sqGetGlobalVar('session_expired_location', $sel, SQ_SESSION))
 332         $sel = '';
 333     sqsession_destroy();
 334     session_write_close();
 335
 336     /**
 337      * in some rare instances, the session seems to stick
 338      * around even after destroying it (!!), so if it does,
 339      * we'll manually flatten the $_SESSION data
 340      */
 341     if (!empty($_SESSION))
 342         $_SESSION = array();
 343
 344     /**
 345      * Allow administrators to define custom session handlers
 346      * for SquirrelMail without needing to change anything in
 347      * php.ini (application-level).
 348      *
 349      * In config_local.php, admin needs to put:
 350      *
 351      *     $custom_session_handlers = array(
 352      *         'my_open_handler',
 353      *         'my_close_handler',
 354      *         'my_read_handler',
 355      *         'my_write_handler',
 356      *         'my_destroy_handler',
 357      *         'my_gc_handler',
 358      *     );
 359      *     session_module_name('user');
 360      *     session_set_save_handler(
 361      *         $custom_session_handlers[0],
 362      *         $custom_session_handlers[1],
 363      *         $custom_session_handlers[2],
 364      *         $custom_session_handlers[3],
 365      *         $custom_session_handlers[4],
 366      *         $custom_session_handlers[5]
 367      *     );
 368      *
 369      * We need to replicate that code once here because PHP has
 370      * long had a bug that resets the session handler mechanism
 371      * when the session data is also destroyed.  Because of this
 372      * bug, even administrators who define custom session handlers
 373      * via a PHP pre-load defined in php.ini (auto_prepend_file)
 374      * will still need to define the $custom_session_handlers array
 375      * in config_local.php.
 376      */
 377     global $custom_session_handlers;
 378     if (!empty($custom_session_handlers)) {
 379         $open    = $custom_session_handlers[0];
 380         $close   = $custom_session_handlers[1];
 381         $read    = $custom_session_handlers[2];
 382         $write   = $custom_session_handlers[3];
 383         $destroy = $custom_session_handlers[4];
 384         $gc      = $custom_session_handlers[5];
 385         session_module_name('user');
 386         session_set_save_handler($open, $close, $read, $write, $destroy, $gc);
 387     }
 388
 389     sqsession_is_active();
 390     session_regenerate_id();
 391
 392     // put session restore data back into session if necessary
 393     if (!empty($sel)) {
 394         sqsession_register($sel, 'session_expired_location');
 395         if (!empty($sep))
 396             sqsession_register($sep, 'session_expired_post');
 397     }
 398 }
 399
 400 /**
 401  * SquirrelMail internal version number -- DO NOT CHANGE
 402  * $sm_internal_version = array (release, major, minor)
 403  */
 404 $SQM_INTERNAL_VERSION = explode('.', SM_VERSION, 3);
 405 $SQM_INTERNAL_VERSION[2] = intval($SQM_INTERNAL_VERSION[2]);
 406
 407
 408 /* load prefs system; even when user not logged in, should be OK to do this here */
 409 require(SM_PATH . 'functions/prefs.php');
 410
 411
 412 /* if plugins are disabled only for one user and
 413  * the current user is NOT that user, turn them
 414  * back on
 415  */
 416 sqgetGlobalVar('username', $username, SQ_SESSION);
 417 if ($disable_plugins && !empty($disable_plugins_user)
 418  && $username != $disable_plugins_user) {
 419     $disable_plugins = false;
 420 }
 421
 422
 423 /* remove all plugins if they are disabled */
 424 if ($disable_plugins) {
 425    $plugins = array();
 426 }
 427
 428
 429 /**
 430  * Include Compatibility plugin if available.
 431  */
 432 if (!$disable_plugins && file_exists(SM_PATH . 'plugins/compatibility/functions.php'))
 433     include_once(SM_PATH . 'plugins/compatibility/functions.php');
 434
 435
 436 /**
 437  * MAIN PLUGIN LOADING CODE HERE
 438  * On init, we no longer need to load all plugin setup files.
 439  * Now, we load the statically generated hook registrations here
 440  * and let the hook calls include only the plugins needed.
 441  */
 442 $squirrelmail_plugin_hooks = array();
 443 if (!$disable_plugins && file_exists(SM_PATH . 'config/plugin_hooks.php')) {
 444 //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)
 445     require(SM_PATH . 'config/plugin_hooks.php');
 446 }
 447
 448
 449 /**
 450  * Plugin authors note that the "config_override" hook used to be
 451  * executed here, but please adapt your plugin to use this "prefs_backend"
 452  * hook instead, making sure that it does NOT return anything, since
 453  * doing so will interfere with proper prefs system functionality.
 454  * Of course, otherwise, this hook may be used to do any configuration
 455  * overrides as needed, as well as set up a custom preferences backend.
 456  */
 457 $prefs_backend = do_hook('prefs_backend', $null);
 458 if (isset($prefs_backend) && !empty($prefs_backend) && file_exists(SM_PATH . $prefs_backend)) {
 459     require(SM_PATH . $prefs_backend);
 460 } elseif (isset($prefs_dsn) && !empty($prefs_dsn)) {
 461     require(SM_PATH . 'functions/db_prefs.php');
 462 } else {
 463     require(SM_PATH . 'functions/file_prefs.php');
 464 }
 465
 466
 467
 468 /**
 469  * DISABLED.
 470  * Remove globalized session data in rg=on setups
 471  *
 472  * Code can be utilized when session is started, but data is not loaded.
 473  * We have already loaded configuration and other important vars. Can't
 474  * clean session globals here, beside, the cleanout of globals at the
 475  * top of this file will have removed anything this code would find anyway.
 476 if ((bool) @ini_get('register_globals') &&
 477     strtolower(ini_get('register_globals'))!='off') {
 478     foreach ($_SESSION as $key => $value) {
 479         unset($GLOBALS[$key]);
 480     }
 481 }
 482 */
 483
 484 sqsession_register(SM_BASE_URI,'base_uri');
 485
 486 /**
 487  * Retrieve the language cookie
 488  */
 489 if (! sqgetGlobalVar('squirrelmail_language',$squirrelmail_language,SQ_COOKIE)) {
 490     $squirrelmail_language = '';
 491 }
 492
 493
 494 /**
 495  * In some cases, buffering all output allows more complex functionality,
 496  * especially for plugins that want to add headers on hooks that are beyond
 497  * the point of output having been sent to the browser otherwise.
 498  *
 499  * Note that we don't turn this on any earlier since we want to allow plugins
 500  * to turn it on themselves via a configuration override on the prefs_backend
 501  * hook.
 502  *
 503  */
 504 if ($buffer_output) ob_start(!empty($buffered_output_handler) ? $buffered_output_handler : NULL);
 505
 506
 507 /**
 508  * Do something special for some pages. This is based on the PAGE_NAME constant
 509  * set at the top of every page.
 510  */
 511 $set_up_langage_after_template_setup = FALSE;
 512 switch (PAGE_NAME) {
 513     case 'style':
 514
 515         // need to get the right template set up
 516         //
 517         sqGetGlobalVar('templateid', $templateid, SQ_GET);
 518
 519         // sanitize just in case...
 520         //
 521         $templateid = preg_replace('/(\.\.\/){1,}/', '', $templateid);
 522
 523         // make sure given template actually is available
 524         //
 525         $found_templateset = false;
 526         for ($i = 0; $i < count($aTemplateSet); ++$i) {
 527             if ($aTemplateSet[$i]['ID'] == $templateid) {
 528                 $found_templateset = true;
 529                 break;
 530             }
 531         }
 532
 533 // FIXME: do we need/want to check here for actual (physical) presence of template sets?
 534         // selected template not available, fall back to default template
 535         //
 536         if (!$found_templateset) {
 537             $sTemplateID = Template::get_default_template_set();
 538         } else {
 539             $sTemplateID = $templateid;
 540         }
 541
 542         session_write_close();
 543         break;
 544
 545     case 'mailto':
 546         // nothing to do
 547         break;
 548
 549     case 'redirect':
 550         require(SM_PATH . 'functions/auth.php');
 551         //nobreak;
 552
 553     case 'login':
 554         require(SM_PATH . 'functions/display_messages.php' );
 555         require(SM_PATH . 'functions/page_header.php');
 556         require(SM_PATH . 'functions/html.php');
 557
 558         // reset template file cache
 559         //
 560         $sTemplateID = Template::get_default_template_set();
 561         Template::cache_template_file_hierarchy($sTemplateID, TRUE);
 562
 563         /**
 564          * Make sure icon variables are setup for the login page.
 565          */
 566         $icon_theme = $icon_themes[$icon_theme_def]['PATH'];
 567         /*
 568          * NOTE: The $icon_theme_path var should contain the path to the icon
 569          *       theme to use.  If the admin has disabled icons, or the user has
 570          *       set the icon theme to "None," no icons will be used.
 571          */
 572         $icon_theme_path = (!$use_icons || $icon_theme=='none') ? NULL : ($icon_theme == 'template' ? SM_PATH . Template::calculate_template_images_directory($sTemplateID) : $icon_theme);
 573
 574         break;
 575     default:
 576         require(SM_PATH . 'functions/display_messages.php' );
 577         require(SM_PATH . 'functions/page_header.php');
 578         require(SM_PATH . 'functions/html.php');
 579
 580
 581         /**
 582          * Check if we are logged in and does optional referrer check
 583          */
 584         require(SM_PATH . 'functions/auth.php');
 585
 586         global $check_referrer, $domain;
 587         if (!sqgetGlobalVar('HTTP_REFERER', $referrer, SQ_SERVER)) $referrer = '';
 588         if ($check_referrer == '###DOMAIN###') $check_referrer = $domain;
 589         if (!empty($check_referrer)) {
 590             $ssl_check_referrer = 'https://' . $check_referrer;
 591             $check_referrer = 'http://' . $check_referrer;
 592         }
 593         if (!sqsession_is_registered('user_is_logged_in')
 594          || ($check_referrer && !empty($referrer)
 595           && strpos(strtolower($referrer), strtolower($check_referrer)) !== 0
 596           && strpos(strtolower($referrer), strtolower($ssl_check_referrer)) !== 0)) {
 597
 598             // use $message to indicate what logout text the user
 599             // will see... if 0, typical "You must be logged in"
 600             // if 1, information that the user session was saved
 601             // and will be resumed after (re)login, if 2, there
 602             // seems to have been a XSS or phishing attack (bad
 603             // referrer)
 604             //
 605             $message = 0;
 606
 607             //  First we store some information in the new session to prevent
 608             //  information-loss.
 609             //
 610             $session_expired_post = $_POST;
 611             $session_expired_location = PAGE_NAME;
 612             if (!sqsession_is_registered('session_expired_post')) {
 613                 sqsession_register($session_expired_post,'session_expired_post');
 614             }
 615             if (!sqsession_is_registered('session_expired_location')) {
 616                 sqsession_register($session_expired_location,'session_expired_location');
 617                 if ($session_expired_location == 'compose')
 618                     $message = 1;
 619             }
 620
 621             // was bad referrer the reason we were rejected?
 622             //
 623             if (sqsession_is_registered('user_is_logged_in')
 624              && $check_referrer && !empty($referrer))
 625                 $message = 2;
 626
 627             // signout page will deal with users who aren't logged
 628             // in on its own; don't show error here
 629             //
 630             if ( PAGE_NAME == 'signout' ) {
 631                 return;
 632             }
 633
 634             /**
 635              * Initialize the template object (logout_error uses it)
 636              */
 637             /*
 638              * $sTemplateID is not initialized when a user is not logged in, so we
 639              * will use the config file defaults here.  If the neccesary variables
 640              * are not set, force a default value.
 641              */
 642             if (PAGE_NAME == 'squirrelmail_rpc') {
 643                 $sTemplateID = Template::get_rpc_template_set();
 644             } else {
 645                 $sTemplateID = Template::get_default_template_set();
 646             }
 647             $oTemplate = Template::construct_template($sTemplateID);
 648
 649             set_up_language($squirrelmail_language, true);
 650             if (!$message)
 651                 logout_error( _("You must be logged in to access this page.") );
 652             else if ($message == 1)
 653                 logout_error( _("Your session has expired, but will be resumed after logging in again.") );
 654             else if ($message == 2)
 655                 logout_error( _("The current page request appears to have originated from an unrecognized source.") );
 656             exit;
 657         }
 658
 659         sqgetGlobalVar('authz',$authz,SQ_SESSION);
 660
 661         /**
 662          * Setting the prefs backend
 663          */
 664         sqgetGlobalVar('prefs_cache', $prefs_cache, SQ_SESSION );
 665         sqgetGlobalVar('prefs_are_cached', $prefs_are_cached, SQ_SESSION );
 666
 667         if ( !sqsession_is_registered('prefs_are_cached') ||
 668             !isset( $prefs_cache) ||
 669             !is_array( $prefs_cache)) {
 670             $prefs_are_cached = false;
 671             $prefs_cache = false; //array();
 672         }
 673
 674         /**
 675          * initializing user settings
 676          */
 677         require(SM_PATH . 'include/load_prefs.php');
 678
 679         /**
 680          * We'll need this to later have a noframes version
 681          *
 682          * Check if the user has a language preference, but no cookie.
 683          * Send him a cookie with his language preference, if there is
 684          * such discrepancy.
 685          */
 686          $my_language = getPref($data_dir, $username, 'language');
 687          if ($my_language != $squirrelmail_language) {
 688              sqsetcookie('squirrelmail_language', $my_language, time()+2592000, $base_uri);
 689          }
 690
 691         $set_up_langage_after_template_setup = TRUE;
 692
 693         $timeZone = getPref($data_dir, $username, 'timezone');
 694
 695         /* Check to see if we are allowed to set the TZ environment variable.
 696          * We are able to do this if ...
 697          *   safe_mode is disabled OR
 698          *   safe_mode_allowed_env_vars is empty (you are allowed to set any) OR
 699          *   safe_mode_allowed_env_vars contains TZ
 700          */
 701         $tzChangeAllowed = (!ini_get('safe_mode')) ||
 702                             !strcmp(ini_get('safe_mode_allowed_env_vars'),'') ||
 703                             preg_match('/^([\w_]+,)*TZ/', ini_get('safe_mode_allowed_env_vars'));
 704
 705         if ( $timeZone != SMPREF_NONE && ($timeZone != "")
 706             && $tzChangeAllowed ) {
 707
 708             // get time zone key, if strict or custom strict timezones are used
 709             if (isset($time_zone_type) &&
 710                 ($time_zone_type == 1 || $time_zone_type == 3)) {
 711                 /* load time zone functions */
 712                 require(SM_PATH . 'include/timezones.php');
 713                 $realTimeZone = sq_get_tz_key($timeZone);
 714             } else {
 715                 $realTimeZone = $timeZone;
 716             }
 717
 718             // set time zone
 719             if ($realTimeZone) {
 720                 putenv("TZ=".$realTimeZone);
 721             }
 722         }
 723
 724         /**
 725          * php 5.1.0 added time zone functions. Set time zone with them in order
 726          * to prevent E_STRICT notices and allow time zone modifications in safe_mode.
 727          */
 728         if (function_exists('date_default_timezone_set')) {
 729             if ($timeZone != SMPREF_NONE && $timeZone != "") {
 730                 date_default_timezone_set($timeZone);
 731             } else {
 732                 // interface runs on server's time zone. Remove php E_STRICT complains
 733                 $default_timezone = @date_default_timezone_get();
 734                 date_default_timezone_set($default_timezone);
 735             }
 736         }
 737         break;
 738 }
 739
 740 /*
 741  * $sTemplateID is not initialized when a user is not logged in, so we
 742  * will use the config file defaults here.  If the neccesary variables
 743  * are not set, force a default value.
 744  *
 745  * If the user is logged in, $sTemplateID will be set in load_prefs.php,
 746  * so we shouldn't change it here.
 747  */
 748 if (!isset($sTemplateID)) {
 749     if (PAGE_NAME == 'squirrelmail_rpc') {
 750         $sTemplateID = Template::get_rpc_template_set();
 751     } else {
 752         $sTemplateID = Template::get_default_template_set();
 753     }
 754     $icon_theme_path = !$use_icons ? NULL : Template::calculate_template_images_directory($sTemplateID);
 755 }
 756
 757 // template object may have already been constructed in load_prefs.php
 758 //
 759 if (empty($oTemplate)) {
 760     $oTemplate = Template::construct_template($sTemplateID);
 761 }
 762
 763 // We want some variables to always be available to the template
 764 //
 765 $oTemplate->assign('javascript_on',
 766     (sqGetGlobalVar('user_is_logged_in', $user_is_logged_in, SQ_SESSION)
 767      ?  checkForJavascript() : 0));
 768 $oTemplate->assign('base_uri', sqm_baseuri());
 769 $always_include = array('sTemplateID', 'icon_theme_path');
 770 foreach ($always_include as $var) {
 771     $oTemplate->assign($var, (isset($$var) ? $$var : NULL));
 772 }
 773
 774 // A few output elements are used often, so just get them once here
 775 //
 776 $nbsp = $oTemplate->fetch('non_breaking_space.tpl');
 777 $br = $oTemplate->fetch('line_break.tpl');
 778
 779
 780 /**
 781  * Set up the language.
 782  *
 783  * This code block corresponds to the *default* block of the switch
 784  * statement above, but the language cannot be set up until after the
 785  * template is instantiated, so we set $set_up_langage_after_template_setup
 786  * above and do the linguistic stuff now.
 787  */
 788 if ($set_up_langage_after_template_setup) {
 789     $err=set_up_language(getPref($data_dir, $username, 'language'));
 790
 791     // Japanese translation used without mbstring support
 792     if ($err==2) {
 793         $sError = "<p>Your administrator needs to have PHP installed with the multibyte string extension enabled (using configure option --enable-mbstring).</p>\n"
 794                 . "<p>This system has assumed that you accidently switched to Japanese and has reverted your language preference to English.</p>\n"
 795                 . "<p>Please refresh this page in order to continue using your webmail.</p>\n";
 796         error_box($sError);
 797     }
 798 }
 799
 800
 801 /**
 802  * Initialize our custom error handler object
 803  */
 804 $oErrorHandler = new ErrorHandler($oTemplate,'error_message.tpl');
 805
 806
 807 /**
 808  * Activate custom error handling
 809  */
 810 if (version_compare(PHP_VERSION, "4.3.0", ">=")) {
 811     $oldErrorHandler = set_error_handler(array($oErrorHandler, 'SquirrelMailErrorhandler'));
 812 } else {
 813     $oldErrorHandler = set_error_handler('SquirrelMailErrorhandler');
 814 }
 815
 816
 817 // ============================================================================
 818 // ================= End of Live Code, Beginning of Functions =================
 819 // ============================================================================
 820
 821
 822 /**
 823  * Javascript support detection function
 824  * @param boolean $reset recheck javascript support if set to true.
 825  * @return integer SMPREF_JS_ON or SMPREF_JS_OFF ({@see include/constants.php})
 826  * @since 1.5.1
 827  */
 828 function checkForJavascript($reset = FALSE) {
 829   global $data_dir, $username, $javascript_on, $javascript_setting;
 830
 831   if ( !$reset && sqGetGlobalVar('javascript_on', $javascript_on, SQ_SESSION) )
 832     return $javascript_on;
 833
 834   //FIXME: this isn't used anywhere else in this function; can we remove it?  why is it here?
 835   $user_is_logged_in = FALSE;
 836   if ( $reset || !isset($javascript_setting) )
 837     $javascript_setting = getPref($data_dir, $username, 'javascript_setting', SMPREF_JS_AUTODETECT);
 838
 839   if ( !sqGetGlobalVar('new_js_autodetect_results', $js_autodetect_results) &&
 840        !sqGetGlobalVar('js_autodetect_results', $js_autodetect_results) )
 841     $js_autodetect_results = SMPREF_JS_OFF;
 842
 843   if ( $javascript_setting == SMPREF_JS_AUTODETECT )
 844     $javascript_on = $js_autodetect_results;
 845   else
 846     $javascript_on = $javascript_setting;
 847
 848   sqsession_register($javascript_on, 'javascript_on');
 849   return $javascript_on;
 850 }
 851
 852 function sqm_baseuri() {
 853     global $base_uri;
 854     return $base_uri;
 855 }