libraries/session.inc.php

   1 <?php
   2 /* vim: set expandtab sw=4 ts=4 sts=4: */
   3 /**
   4  * session handling
   5  *
   6  * @todo    add failover or warn if sessions are not configured properly
   7  * @todo    add an option to use mm-module for session handler
   8  * @see     http://www.php.net/session
   9  * @package PhpMyAdmin
  10  */
  11 if (! defined('PHPMYADMIN')) {
  12     exit;
  13 }
  14
  15 // verify if PHP supports session, die if it does not
  16
  17 if (!@function_exists('session_name')) {
  18     PMA_warnMissingExtension('session', true);
  19 } elseif (ini_get('session.auto_start') == true && session_name() != 'phpMyAdmin') {
  20     // Do not delete the existing session, it might be used by other
  21     // applications; instead just close it.
  22     session_write_close();
  23 }
  24
  25 // disable starting of sessions before all settings are done
  26 // does not work, besides how it is written in php manual
  27 //ini_set('session.auto_start', 0);
  28
  29 // session cookie settings
  30 session_set_cookie_params(0, $GLOBALS['PMA_Config']->getCookiePath(),
  31     '', $GLOBALS['PMA_Config']->isHttps(), true);
  32
  33 // cookies are safer (use @ini_set() in case this function is disabled)
  34 @ini_set('session.use_cookies', true);
  35
  36 // optionally set session_save_path
  37 $path = $GLOBALS['PMA_Config']->get('SessionSavePath');
  38 if (!empty($path)) {
  39     session_save_path($path);
  40 }
  41
  42 // but not all user allow cookies
  43 @ini_set('session.use_only_cookies', false);
  44 // do not force transparent session ids, see bug #3398788
  45 //@ini_set('session.use_trans_sid', true);
  46 @ini_set('url_rewriter.tags',
  47     'a=href,frame=src,input=src,form=fakeentry,fieldset=');
  48 //ini_set('arg_separator.output', '&amp;');
  49
  50 // delete session/cookies when browser is closed
  51 @ini_set('session.cookie_lifetime', 0);
  52
  53 // warn but dont work with bug
  54 @ini_set('session.bug_compat_42', false);
  55 @ini_set('session.bug_compat_warn', true);
  56
  57 // use more secure session ids
  58 @ini_set('session.hash_function', 1);
  59
  60 // some pages (e.g. stylesheet) may be cached on clients, but not in shared
  61 // proxy servers
  62 session_cache_limiter('private');
  63
  64 // start the session
  65 // on some servers (for example, sourceforge.net), we get a permission error
  66 // on the session data directory, so I add some "@"
  67
  68 // See bug #1538132. This would block normal behavior on a cluster
  69 //ini_set('session.save_handler', 'files');
  70
  71 $session_name = 'phpMyAdmin';
  72 @session_name($session_name);
  73
  74 if (! isset($_COOKIE[$session_name])) {
  75     // on first start of session we check for errors
  76     // f.e. session dir cannot be accessed - session file not created
  77     $orig_error_count = $GLOBALS['error_handler']->countErrors();
  78     $r = session_start();
  79     if ($r !== true || $orig_error_count != $GLOBALS['error_handler']->countErrors()) {
  80         setcookie($session_name, '', 1);
  81         /*
  82          * Session initialization is done before selecting language, so we
  83          * can not use translations here.
  84          */
  85         PMA_fatalError('Cannot start session without errors, please check errors given in your PHP and/or webserver log file and configure your PHP installation properly.');
  86     }
  87     unset($orig_error_count);
  88 } else {
  89     session_start();
  90 }
  91
  92 /**
  93  * Token which is used for authenticating access queries.
  94  * (we use "space PMA_token space" to prevent overwriting)
  95  */
  96 if (! isset($_SESSION[' PMA_token '])) {
  97     $_SESSION[' PMA_token '] = md5(uniqid(rand(), true));
  98 }
  99
 100 /**
 101  * tries to secure session from hijacking and fixation
 102  * should be called before login and after successfull login
 103  * (only required if sensitive information stored in session)
 104  *
 105  */
 106 function PMA_secureSession()
 107 {
 108     // prevent session fixation and XSS
 109     session_regenerate_id(true);
 110     $_SESSION[' PMA_token '] = md5(uniqid(rand(), true));
 111 }
 112 ?>