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  * @uses    session_name()
  10  * @uses    session_start()
  11  * @uses    ini_set()
  12  * @package phpMyAdmin
  13  */
  14 if (! defined('PHPMYADMIN')) {
  15     exit;
  16 }
  17
  18 // verify if PHP supports session, die if it does not
  19
  20 if (!@function_exists('session_name')) {
  21     PMA_warnMissingExtension('session', true);
  22 } elseif (ini_get('session.auto_start') == true && session_name() != 'phpMyAdmin') {
  23     // Do not delete the existing session, it might be used by other
  24     // applications; instead just close it.
  25     session_write_close();
  26 }
  27
  28 // disable starting of sessions before all settings are done
  29 // does not work, besides how it is written in php manual
  30 //ini_set('session.auto_start', 0);
  31
  32 // session cookie settings
  33 session_set_cookie_params(0, $GLOBALS['PMA_Config']->getCookiePath(),
  34     '', $GLOBALS['PMA_Config']->isHttps(), true);
  35
  36 // cookies are safer (use @ini_set() in case this function is disabled)
  37 @ini_set('session.use_cookies', true);
  38
  39 // optionally set session_save_path
  40 $path = $GLOBALS['PMA_Config']->get('SessionSavePath');
  41 if (!empty($path)) {
  42     session_save_path($path);
  43 }
  44
  45 // but not all user allow cookies
  46 @ini_set('session.use_only_cookies', false);
  47 @ini_set('session.use_trans_sid', true);
  48 @ini_set('url_rewriter.tags',
  49     'a=href,frame=src,input=src,form=fakeentry,fieldset=');
  50 //ini_set('arg_separator.output', '&amp;');
  51
  52 // delete session/cookies when browser is closed
  53 @ini_set('session.cookie_lifetime', 0);
  54
  55 // warn but dont work with bug
  56 @ini_set('session.bug_compat_42', false);
  57 @ini_set('session.bug_compat_warn', true);
  58
  59 // use more secure session ids
  60 @ini_set('session.hash_function', 1);
  61
  62 // some pages (e.g. stylesheet) may be cached on clients, but not in shared
  63 // proxy servers
  64 session_cache_limiter('private');
  65
  66 // start the session
  67 // on some servers (for example, sourceforge.net), we get a permission error
  68 // on the session data directory, so I add some "@"
  69
  70 // See bug #1538132. This would block normal behavior on a cluster
  71 //ini_set('session.save_handler', 'files');
  72
  73 $session_name = 'phpMyAdmin';
  74 @session_name($session_name);
  75
  76 if (! isset($_COOKIE[$session_name])) {
  77     // on first start of session we check for errors
  78     // f.e. session dir cannot be accessed - session file not created
  79     $orig_error_count = $GLOBALS['error_handler']->countErrors();
  80     $r = session_start();
  81     if ($r !== true || $orig_error_count != $GLOBALS['error_handler']->countErrors()) {
  82         setcookie($session_name, '', 1);
  83         /*
  84          * Session initialization is done before selecting language, so we
  85          * can not use translations here.
  86          */
  87         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.');
  88     }
  89     unset($orig_error_count);
  90 } else {
  91     session_start();
  92 }
  93
  94 /**
  95  * Token which is used for authenticating access queries.
  96  * (we use "space PMA_token space" to prevent overwriting)
  97  */
  98 if (!isset($_SESSION[' PMA_token '])) {
  99     $_SESSION[' PMA_token '] = md5(uniqid(rand(), true));
 100 }
 101
 102 /**
 103  * tries to secure session from hijacking and fixation
 104  * should be called before login and after successfull login
 105  * (only required if sensitive information stored in session)
 106  *
 107  * @uses    session_regenerate_id() to secure session from fixation
 108  */
 109 function PMA_secureSession()
 110 {
 111     // prevent session fixation and XSS
 112     session_regenerate_id(true);
 113     $_SESSION[' PMA_token '] = md5(uniqid(rand(), true));
 114 }
 115 ?>