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  * E_STRICT = 2048
 227  * E_DEPRECATED = 8192
 228  */
 229 $error_level = 0;
 230 if ($sm_debug_mode & SM_DEBUG_MODE_SIMPLE)
 231     $error_level |= E_ERROR;
 232 if ($sm_debug_mode & SM_DEBUG_MODE_MODERATE
 233  || $sm_debug_mode & SM_DEBUG_MODE_ADVANCED)
 234     $error_level = ($error_level | E_ALL) & ~2048 & ~8192;
 235 if ($sm_debug_mode & SM_DEBUG_MODE_STRICT)
 236     $error_level |= 2048 | 8192;
 237 error_reporting($error_level);
 238
 239
 240 /**
 241  * Detect SSL connections
 242  */
 243 $is_secure_connection = is_ssl_secured_connection();
 244
 245
 246 require(SM_PATH . 'functions/plugin.php');
 247 require(SM_PATH . 'include/languages.php');
 248 require(SM_PATH . 'class/template/Template.class.php');
 249 require(SM_PATH . 'class/error.class.php');
 250
 251 /**
 252  * If magic_quotes_runtime is on, SquirrelMail breaks in new and creative ways.
 253  * Force magic_quotes_runtime off.
 254  * tassium@squirrelmail.org - I put it here in the hopes that all SM code includes this.
 255  * If there's a better place, please let me know.
 256  */
 257 ini_set('magic_quotes_runtime','0');
 258
 259
 260 /* if running with magic_quotes_gpc then strip the slashes
 261    from POST and GET global arrays */
 262 if (function_exists('get_magic_quotes_gpc') && @get_magic_quotes_gpc()) {
 263     sqstripslashes($_GET);
 264     sqstripslashes($_POST);
 265 }
 266
 267
 268 /**
 269  * Strip any tags added to the url from PHP_SELF.
 270  * This fixes hand crafted url XXS expoits for any
 271  * page that uses PHP_SELF as the FORM action
 272  * Update: strip_tags() won't catch something like
 273  * src/right_main.php?sort=0&startMessage=1&mailbox=INBOX&xxx="><script>window.open("http://example.com")</script>
 274  * or
 275  * contrib/decrypt_headers.php/%22%20onmouseover=%22alert(%27hello%20world%27)%22%3E
 276  * because it doesn't bother with broken tags.
 277  * htmlspecialchars() is the preferred method.
 278  * QUERY_STRING also needs the same treatment since it is
 279  * used in php_self().
 280  * Update again: the encoding of ampersands that occurs
 281  * using htmlspecialchars() corrupts the query strings
 282  * in normal URIs, so we have to let those through.
 283 FIXME: will the de-sanitizing of ampersands create any security/XSS problems?
 284  */
 285 if (isset($_SERVER['REQUEST_URI']))
 286     $_SERVER['REQUEST_URI'] = str_replace('&amp;', '&', htmlspecialchars($_SERVER['REQUEST_URI']));
 287 if (isset($_SERVER['PHP_SELF']))
 288     $_SERVER['PHP_SELF'] = str_replace('&amp;', '&', htmlspecialchars($_SERVER['PHP_SELF']));
 289 if (isset($_SERVER['QUERY_STRING']))
 290     $_SERVER['QUERY_STRING'] = str_replace('&amp;', '&', htmlspecialchars($_SERVER['QUERY_STRING']));
 291
 292 $PHP_SELF = php_self();
 293
 294 /**
 295  * Initialize the session
 296  */
 297
 298 /** set the name of the session cookie */
 299 if (!isset($session_name) || !$session_name) {
 300     $session_name = 'SQMSESSID';
 301 }
 302
 303 /**
 304  * When session.auto_start is On we want to destroy/close the session
 305  */
 306 $sSessionAutostartName = session_name();
 307 $sSessionAutostartID = session_id();
 308 if (!empty($sSessionAutostartID) && $sSessionAutostartName !== $session_name) {
 309     $sCookiePath = ini_get('session.cookie_path');
 310     $sCookieDomain = ini_get('session.cookie_domain');
 311     // reset the cookie
 312     sqsetcookie($sSessionAutostartName,'',1,$sCookiePath,$sCookieDomain);
 313     @session_destroy();
 314     session_write_close();
 315 }
 316
 317 /**
 318  * includes from classes stored in the session
 319  */
 320 require(SM_PATH . 'class/mime.class.php');
 321
 322 ini_set('session.name' , $session_name);
 323 session_set_cookie_params (0, $base_uri);
 324 sqsession_is_active();
 325
 326 /**
 327  * When on login page, have to reset the user session, making
 328  * sure to save session restore data first
 329  */
 330 if (PAGE_NAME == 'login') {
 331     if (!sqGetGlobalVar('session_expired_post', $sep, SQ_SESSION))
 332         $sep = '';
 333     if (!sqGetGlobalVar('session_expired_location', $sel, SQ_SESSION))
 334         $sel = '';
 335     sqsession_destroy();
 336     session_write_close();
 337
 338     /**
 339      * in some rare instances, the session seems to stick
 340      * around even after destroying it (!!), so if it does,
 341      * we'll manually flatten the $_SESSION data
 342      */
 343     if (!empty($_SESSION))
 344         $_SESSION = array();
 345
 346     /**
 347      * Allow administrators to define custom session handlers
 348      * for SquirrelMail without needing to change anything in
 349      * php.ini (application-level).
 350      *
 351      * In config_local.php, admin needs to put:
 352      *
 353      *     $custom_session_handlers = array(
 354      *         'my_open_handler',
 355      *         'my_close_handler',
 356      *         'my_read_handler',
 357      *         'my_write_handler',
 358      *         'my_destroy_handler',
 359      *         'my_gc_handler',
 360      *     );
 361      *     session_module_name('user');
 362      *     session_set_save_handler(
 363      *         $custom_session_handlers[0],
 364      *         $custom_session_handlers[1],
 365      *         $custom_session_handlers[2],
 366      *         $custom_session_handlers[3],
 367      *         $custom_session_handlers[4],
 368      *         $custom_session_handlers[5]
 369      *     );
 370      *
 371      * We need to replicate that code once here because PHP has
 372      * long had a bug that resets the session handler mechanism
 373      * when the session data is also destroyed.  Because of this
 374      * bug, even administrators who define custom session handlers
 375      * via a PHP pre-load defined in php.ini (auto_prepend_file)
 376      * will still need to define the $custom_session_handlers array
 377      * in config_local.php.
 378      */
 379     global $custom_session_handlers;
 380     if (!empty($custom_session_handlers)) {
 381         $open    = $custom_session_handlers[0];
 382         $close   = $custom_session_handlers[1];
 383         $read    = $custom_session_handlers[2];
 384         $write   = $custom_session_handlers[3];
 385         $destroy = $custom_session_handlers[4];
 386         $gc      = $custom_session_handlers[5];
 387         session_module_name('user');
 388         session_set_save_handler($open, $close, $read, $write, $destroy, $gc);
 389     }
 390
 391     sqsession_is_active();
 392     session_regenerate_id();
 393
 394     // put session restore data back into session if necessary
 395     if (!empty($sel)) {
 396         sqsession_register($sel, 'session_expired_location');
 397         if (!empty($sep))
 398             sqsession_register($sep, 'session_expired_post');
 399     }
 400 }
 401
 402 /**
 403  * SquirrelMail internal version number -- DO NOT CHANGE
 404  * $sm_internal_version = array (release, major, minor)
 405  */
 406 $SQM_INTERNAL_VERSION = explode('.', SM_VERSION, 3);
 407 $SQM_INTERNAL_VERSION[2] = intval($SQM_INTERNAL_VERSION[2]);
 408
 409
 410 /* load prefs system; even when user not logged in, should be OK to do this here */
 411 require(SM_PATH . 'functions/prefs.php');
 412
 413
 414 /* if plugins are disabled only for one user and
 415  * the current user is NOT that user, turn them
 416  * back on
 417  */
 418 sqgetGlobalVar('username', $username, SQ_SESSION);
 419 if ($disable_plugins && !empty($disable_plugins_user)
 420  && $username != $disable_plugins_user) {
 421     $disable_plugins = false;
 422 }
 423
 424
 425 /* remove all plugins if they are disabled */
 426 if ($disable_plugins) {
 427    $plugins = array();
 428 }
 429
 430
 431 /**
 432  * Include Compatibility plugin if available.
 433  */
 434 if (!$disable_plugins && file_exists(SM_PATH . 'plugins/compatibility/functions.php'))
 435     include_once(SM_PATH . 'plugins/compatibility/functions.php');
 436
 437
 438 /**
 439  * MAIN PLUGIN LOADING CODE HERE
 440  * On init, we no longer need to load all plugin setup files.
 441  * Now, we load the statically generated hook registrations here
 442  * and let the hook calls include only the plugins needed.
 443  */
 444 $squirrelmail_plugin_hooks = array();
 445 if (!$disable_plugins && file_exists(SM_PATH . 'config/plugin_hooks.php')) {
 446 //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)
 447     require(SM_PATH . 'config/plugin_hooks.php');
 448 }
 449
 450
 451 /**
 452  * Plugin authors note that the "config_override" hook used to be
 453  * executed here, but please adapt your plugin to use this "prefs_backend"
 454  * hook instead, making sure that it does NOT return anything, since
 455  * doing so will interfere with proper prefs system functionality.
 456  * Of course, otherwise, this hook may be used to do any configuration
 457  * overrides as needed, as well as set up a custom preferences backend.
 458  */
 459 $prefs_backend = do_hook('prefs_backend', $null);
 460 if (isset($prefs_backend) && !empty($prefs_backend) && file_exists(SM_PATH . $prefs_backend)) {
 461     require(SM_PATH . $prefs_backend);
 462 } elseif (isset($prefs_dsn) && !empty($prefs_dsn)) {
 463     require(SM_PATH . 'functions/db_prefs.php');
 464 } else {
 465     require(SM_PATH . 'functions/file_prefs.php');
 466 }
 467
 468
 469
 470 /**
 471  * DISABLED.
 472  * Remove globalized session data in rg=on setups
 473  *
 474  * Code can be utilized when session is started, but data is not loaded.
 475  * We have already loaded configuration and other important vars. Can't
 476  * clean session globals here, beside, the cleanout of globals at the
 477  * top of this file will have removed anything this code would find anyway.
 478 if ((bool) @ini_get('register_globals') &&
 479     strtolower(ini_get('register_globals'))!='off') {
 480     foreach ($_SESSION as $key => $value) {
 481         unset($GLOBALS[$key]);
 482     }
 483 }
 484 */
 485
 486 sqsession_register(SM_BASE_URI,'base_uri');
 487
 488 /**
 489  * Retrieve the language cookie
 490  */
 491 if (! sqgetGlobalVar('squirrelmail_language',$squirrelmail_language,SQ_COOKIE)) {
 492     $squirrelmail_language = '';
 493 }
 494
 495
 496 /**
 497  * In some cases, buffering all output allows more complex functionality,
 498  * especially for plugins that want to add headers on hooks that are beyond
 499  * the point of output having been sent to the browser otherwise.
 500  *
 501  * Note that we don't turn this on any earlier since we want to allow plugins
 502  * to turn it on themselves via a configuration override on the prefs_backend
 503  * hook.
 504  *
 505  */
 506 if ($buffer_output) ob_start(!empty($buffered_output_handler) ? $buffered_output_handler : NULL);
 507
 508
 509 /**
 510  * Do something special for some pages. This is based on the PAGE_NAME constant
 511  * set at the top of every page.
 512  */
 513 $set_up_langage_after_template_setup = FALSE;
 514 switch (PAGE_NAME) {
 515     case 'style':
 516
 517         // need to get the right template set up
 518         //
 519         sqGetGlobalVar('templateid', $templateid, SQ_GET);
 520
 521         // sanitize just in case...
 522         //
 523         $templateid = preg_replace('/(\.\.\/){1,}/', '', $templateid);
 524
 525         // make sure given template actually is available
 526         //
 527         $found_templateset = false;
 528         for ($i = 0; $i < count($aTemplateSet); ++$i) {
 529             if ($aTemplateSet[$i]['ID'] == $templateid) {
 530                 $found_templateset = true;
 531                 break;
 532             }
 533         }
 534
 535 // FIXME: do we need/want to check here for actual (physical) presence of template sets?
 536         // selected template not available, fall back to default template
 537         //
 538         if (!$found_templateset) {
 539             $sTemplateID = Template::get_default_template_set();
 540         } else {
 541             $sTemplateID = $templateid;
 542         }
 543
 544         session_write_close();
 545         break;
 546
 547     case 'mailto':
 548         // nothing to do
 549         break;
 550
 551     case 'redirect':
 552         require(SM_PATH . 'functions/auth.php');
 553         //nobreak;
 554
 555     case 'login':
 556         require(SM_PATH . 'functions/display_messages.php' );
 557         require(SM_PATH . 'functions/page_header.php');
 558         require(SM_PATH . 'functions/html.php');
 559
 560         // reset template file cache
 561         //
 562         $sTemplateID = Template::get_default_template_set();
 563         Template::cache_template_file_hierarchy($sTemplateID, TRUE);
 564
 565         /**
 566          * Make sure icon variables are setup for the login page.
 567          */
 568         $icon_theme = $icon_themes[$icon_theme_def]['PATH'];
 569         /*
 570          * NOTE: The $icon_theme_path var should contain the path to the icon
 571          *       theme to use.  If the admin has disabled icons, or the user has
 572          *       set the icon theme to "None," no icons will be used.
 573          */
 574         $icon_theme_path = (!$use_icons || $icon_theme=='none') ? NULL : ($icon_theme == 'template' ? SM_PATH . Template::calculate_template_images_directory($sTemplateID) : $icon_theme);
 575
 576         break;
 577     default:
 578         require(SM_PATH . 'functions/display_messages.php' );
 579         require(SM_PATH . 'functions/page_header.php');
 580         require(SM_PATH . 'functions/html.php');
 581
 582
 583         /**
 584          * Check if we are logged in and does optional referrer check
 585          */
 586         require(SM_PATH . 'functions/auth.php');
 587
 588         global $check_referrer, $domain;
 589         if (!sqgetGlobalVar('HTTP_REFERER', $referrer, SQ_SERVER)) $referrer = '';
 590         if ($check_referrer == '###DOMAIN###') $check_referrer = $domain;
 591         if (!empty($check_referrer)) {
 592             $ssl_check_referrer = 'https://' . $check_referrer;
 593             $check_referrer = 'http://' . $check_referrer;
 594         }
 595         if (!sqsession_is_registered('user_is_logged_in')
 596          || ($check_referrer && !empty($referrer)
 597           && strpos(strtolower($referrer), strtolower($check_referrer)) !== 0
 598           && strpos(strtolower($referrer), strtolower($ssl_check_referrer)) !== 0)) {
 599
 600             // use $message to indicate what logout text the user
 601             // will see... if 0, typical "You must be logged in"
 602             // if 1, information that the user session was saved
 603             // and will be resumed after (re)login, if 2, there
 604             // seems to have been a XSS or phishing attack (bad
 605             // referrer)
 606             //
 607             $message = 0;
 608
 609             //  First we store some information in the new session to prevent
 610             //  information-loss.
 611             //
 612             $session_expired_post = $_POST;
 613             $session_expired_location = PAGE_NAME;
 614             if (!sqsession_is_registered('session_expired_post')) {
 615                 sqsession_register($session_expired_post,'session_expired_post');
 616             }
 617             if (!sqsession_is_registered('session_expired_location')) {
 618                 sqsession_register($session_expired_location,'session_expired_location');
 619                 if ($session_expired_location == 'compose')
 620                     $message = 1;
 621             }
 622
 623             // was bad referrer the reason we were rejected?
 624             //
 625             if (sqsession_is_registered('user_is_logged_in')
 626              && $check_referrer && !empty($referrer))
 627                 $message = 2;
 628
 629             // signout page will deal with users who aren't logged
 630             // in on its own; don't show error here
 631             //
 632             if ( PAGE_NAME == 'signout' ) {
 633                 return;
 634             }
 635
 636             /**
 637              * Initialize the template object (logout_error uses it)
 638              */
 639             /*
 640              * $sTemplateID is not initialized when a user is not logged in, so we
 641              * will use the config file defaults here.  If the neccesary variables
 642              * are not set, force a default value.
 643              */
 644             if (PAGE_NAME == 'squirrelmail_rpc') {
 645                 $sTemplateID = Template::get_rpc_template_set();
 646             } else {
 647                 $sTemplateID = Template::get_default_template_set();
 648             }
 649             $oTemplate = Template::construct_template($sTemplateID);
 650
 651             set_up_language($squirrelmail_language, true);
 652             if (!$message)
 653                 logout_error( _("You must be logged in to access this page.") );
 654             else if ($message == 1)
 655                 logout_error( _("Your session has expired, but will be resumed after logging in again.") );
 656             else if ($message == 2)
 657                 logout_error( _("The current page request appears to have originated from an unrecognized source.") );
 658             exit;
 659         }
 660
 661         sqgetGlobalVar('authz',$authz,SQ_SESSION);
 662
 663         /**
 664          * Setting the prefs backend
 665          */
 666         sqgetGlobalVar('prefs_cache', $prefs_cache, SQ_SESSION );
 667         sqgetGlobalVar('prefs_are_cached', $prefs_are_cached, SQ_SESSION );
 668
 669         if ( !sqsession_is_registered('prefs_are_cached') ||
 670             !isset( $prefs_cache) ||
 671             !is_array( $prefs_cache)) {
 672             $prefs_are_cached = false;
 673             $prefs_cache = false; //array();
 674         }
 675
 676         /**
 677          * initializing user settings
 678          */
 679         require(SM_PATH . 'include/load_prefs.php');
 680
 681         /**
 682          * We'll need this to later have a noframes version
 683          *
 684          * Check if the user has a language preference, but no cookie.
 685          * Send him a cookie with his language preference, if there is
 686          * such discrepancy.
 687          */
 688          $my_language = getPref($data_dir, $username, 'language');
 689          if ($my_language != $squirrelmail_language) {
 690              sqsetcookie('squirrelmail_language', $my_language, time()+2592000, $base_uri);
 691          }
 692
 693         $set_up_langage_after_template_setup = TRUE;
 694
 695         $timeZone = getPref($data_dir, $username, 'timezone');
 696
 697         /* Check to see if we are allowed to set the TZ environment variable.
 698          * We are able to do this if ...
 699          *   safe_mode is disabled OR
 700          *   safe_mode_allowed_env_vars is empty (you are allowed to set any) OR
 701          *   safe_mode_allowed_env_vars contains TZ
 702          */
 703         $tzChangeAllowed = (!ini_get('safe_mode')) ||
 704                             !strcmp(ini_get('safe_mode_allowed_env_vars'),'') ||
 705                             preg_match('/^([\w_]+,)*TZ/', ini_get('safe_mode_allowed_env_vars'));
 706
 707         if ( $timeZone != SMPREF_NONE && ($timeZone != "")
 708             && $tzChangeAllowed ) {
 709
 710             // get time zone key, if strict or custom strict timezones are used
 711             if (isset($time_zone_type) &&
 712                 ($time_zone_type == 1 || $time_zone_type == 3)) {
 713                 /* load time zone functions */
 714                 require(SM_PATH . 'include/timezones.php');
 715                 $realTimeZone = sq_get_tz_key($timeZone);
 716             } else {
 717                 $realTimeZone = $timeZone;
 718             }
 719
 720             // set time zone
 721             if ($realTimeZone) {
 722                 putenv("TZ=".$realTimeZone);
 723             }
 724         }
 725
 726         /**
 727          * php 5.1.0 added time zone functions. Set time zone with them in order
 728          * to prevent E_STRICT notices and allow time zone modifications in safe_mode.
 729          */
 730         if (function_exists('date_default_timezone_set')) {
 731             if ($timeZone != SMPREF_NONE && $timeZone != "") {
 732                 date_default_timezone_set($timeZone);
 733             } else {
 734                 // interface runs on server's time zone. Remove php E_STRICT complains
 735                 $default_timezone = @date_default_timezone_get();
 736                 date_default_timezone_set($default_timezone);
 737             }
 738         }
 739         break;
 740 }
 741
 742 /*
 743  * $sTemplateID is not initialized when a user is not logged in, so we
 744  * will use the config file defaults here.  If the neccesary variables
 745  * are not set, force a default value.
 746  *
 747  * If the user is logged in, $sTemplateID will be set in load_prefs.php,
 748  * so we shouldn't change it here.
 749  */
 750 if (!isset($sTemplateID)) {
 751     if (PAGE_NAME == 'squirrelmail_rpc') {
 752         $sTemplateID = Template::get_rpc_template_set();
 753     } else {
 754         $sTemplateID = Template::get_default_template_set();
 755     }
 756     $icon_theme_path = !$use_icons ? NULL : Template::calculate_template_images_directory($sTemplateID);
 757 }
 758
 759 // template object may have already been constructed in load_prefs.php
 760 //
 761 if (empty($oTemplate)) {
 762     $oTemplate = Template::construct_template($sTemplateID);
 763 }
 764
 765 // We want some variables to always be available to the template
 766 //
 767 $oTemplate->assign('javascript_on',
 768     (sqGetGlobalVar('user_is_logged_in', $user_is_logged_in, SQ_SESSION)
 769      ?  checkForJavascript() : 0));
 770 $oTemplate->assign('base_uri', sqm_baseuri());
 771 $always_include = array('sTemplateID', 'icon_theme_path');
 772 foreach ($always_include as $var) {
 773     $oTemplate->assign($var, (isset($$var) ? $$var : NULL));
 774 }
 775
 776 // A few output elements are used often, so just get them once here
 777 //
 778 $nbsp = $oTemplate->fetch('non_breaking_space.tpl');
 779 $br = $oTemplate->fetch('line_break.tpl');
 780
 781
 782 /**
 783  * Set up the language.
 784  *
 785  * This code block corresponds to the *default* block of the switch
 786  * statement above, but the language cannot be set up until after the
 787  * template is instantiated, so we set $set_up_langage_after_template_setup
 788  * above and do the linguistic stuff now.
 789  */
 790 if ($set_up_langage_after_template_setup) {
 791     $err=set_up_language(getPref($data_dir, $username, 'language'));
 792
 793     // Japanese translation used without mbstring support
 794     if ($err==2) {
 795         $sError = "<p>Your administrator needs to have PHP installed with the multibyte string extension enabled (using configure option --enable-mbstring).</p>\n"
 796                 . "<p>This system has assumed that you accidently switched to Japanese and has reverted your language preference to English.</p>\n"
 797                 . "<p>Please refresh this page in order to continue using your webmail.</p>\n";
 798         error_box($sError);
 799     }
 800 }
 801
 802
 803 /**
 804  * Initialize our custom error handler object
 805  */
 806 $oErrorHandler = new ErrorHandler($oTemplate,'error_message.tpl');
 807
 808
 809 /**
 810  * Activate custom error handling
 811  */
 812 if (version_compare(PHP_VERSION, "4.3.0", ">=")) {
 813     $oldErrorHandler = set_error_handler(array($oErrorHandler, 'SquirrelMailErrorhandler'));
 814 } else {
 815     $oldErrorHandler = set_error_handler('SquirrelMailErrorhandler');
 816 }
 817
 818
 819 // ============================================================================
 820 // ================= End of Live Code, Beginning of Functions =================
 821 // ============================================================================
 822
 823
 824 /**
 825  * Javascript support detection function
 826  * @param boolean $reset recheck javascript support if set to true.
 827  * @return integer SMPREF_JS_ON or SMPREF_JS_OFF ({@see include/constants.php})
 828  * @since 1.5.1
 829  */
 830 function checkForJavascript($reset = FALSE) {
 831   global $data_dir, $username, $javascript_on, $javascript_setting;
 832
 833   if ( !$reset && sqGetGlobalVar('javascript_on', $javascript_on, SQ_SESSION) )
 834     return $javascript_on;
 835
 836   //FIXME: this isn't used anywhere else in this function; can we remove it?  why is it here?
 837   $user_is_logged_in = FALSE;
 838   if ( $reset || !isset($javascript_setting) )
 839     $javascript_setting = getPref($data_dir, $username, 'javascript_setting', SMPREF_JS_AUTODETECT);
 840
 841   if ( !sqGetGlobalVar('new_js_autodetect_results', $js_autodetect_results) &&
 842        !sqGetGlobalVar('js_autodetect_results', $js_autodetect_results) )
 843     $js_autodetect_results = SMPREF_JS_OFF;
 844
 845   if ( $javascript_setting == SMPREF_JS_AUTODETECT )
 846     $javascript_on = $js_autodetect_results;
 847   else
 848     $javascript_on = $javascript_setting;
 849
 850   sqsession_register($javascript_on, 'javascript_on');
 851   return $javascript_on;
 852 }
 853
 854 function sqm_baseuri() {
 855     global $base_uri;
 856     return $base_uri;
 857 }