phpmyadmin/libraries/session.inc.php

   1 <?php
   2 /* vim: set expandtab sw=4 ts=4 sts=4: */
   3 /**
   4  * session handling
   5  *
   6  * @version $Id$
   7  * @todo    add failover or warn if sessions are not configured properly
   8  * @todo    add an option to use mm-module for session handler
   9  * @see     http://www.php.net/session
  10  * @uses    session_name()
  11  * @uses    session_start()
  12  * @uses    ini_set()
  13  * @uses    version_compare()
  14  * @uses    PHP_VERSION
  15  */
  16 if (! defined('PHPMYADMIN')) {
  17     exit;
  18 }
  19
  20 // verify if PHP supports session, die if it does not
  21
  22 if (!@function_exists('session_name')) {
  23     PMA_fatalError('strCantLoad', 'session');
  24 } elseif (ini_get('session.auto_start') == true && session_name() != 'phpMyAdmin') {
  25     // Do not delete the existing session, it might be used by other
  26     // applications; instead just close it.
  27     session_write_close();
  28 }
  29
  30 // disable starting of sessions before all settings are done
  31 // does not work, besides how it is written in php manual
  32 //ini_set('session.auto_start', 0);
  33
  34 // session cookie settings
  35 session_set_cookie_params(0, PMA_Config::getCookiePath() . '; HttpOnly',
  36     '', PMA_Config::isHttps());
  37
  38 // cookies are safer (use @ini_set() in case this function is disabled)
  39 @ini_set('session.use_cookies', true);
  40
  41 // but not all user allow cookies
  42 @ini_set('session.use_only_cookies', false);
  43 @ini_set('session.use_trans_sid', true);
  44 @ini_set('url_rewriter.tags',
  45     'a=href,frame=src,input=src,form=fakeentry,fieldset=');
  46 //ini_set('arg_separator.output', '&amp;');
  47
  48 // delete session/cookies when browser is closed
  49 @ini_set('session.cookie_lifetime', 0);
  50
  51 // warn but dont work with bug
  52 @ini_set('session.bug_compat_42', false);
  53 @ini_set('session.bug_compat_warn', true);
  54
  55 // use more secure session ids (with PHP 5)
  56 if (version_compare(PHP_VERSION, '5.0.0', 'ge')) {
  57     @ini_set('session.hash_function', 1);
  58 }
  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 $session_name = 'OpenEMR';
  72 @session_name($session_name);
  73 // strictly, PHP 4 since 4.4.2 would not need a verification
  74 if (version_compare(PHP_VERSION, '5.1.2', 'lt')
  75  && isset($_COOKIE[$session_name])
  76  && eregi("\r|\n", $_COOKIE[$session_name])) {
  77     die('attacked');
  78 }
  79
  80 if (! isset($_COOKIE[$session_name])) {
  81     // on first start of session we will check for errors
  82     // f.e. session dir cannot be accessed - session file not created
  83     ob_start();
  84     $old_display_errors = ini_get('display_errors');
  85     $old_error_reporting = error_reporting(E_ALL);
  86     @ini_set('display_errors', 1);
  87     $r = session_start();
  88     @ini_set('display_errors', $old_display_errors);
  89     error_reporting($old_error_reporting);
  90     unset($old_display_errors, $old_error_reporting);
  91     $session_error = ob_get_contents();
  92     ob_end_clean();
  93     if ($r !== true || ! empty($session_error)) {
  94         setcookie($session_name, '', 1);
  95         PMA_fatalError('strSessionStartupErrorGeneral');
  96     }
  97 } else {
  98     @session_start();
  99 }
 100
 101 /**
 102  * Token which is used for authenticating access queries.
 103  * (we use "space PMA_token space" to prevent overwriting)
 104  */
 105 if (!isset($_SESSION[' PMA_token '])) {
 106     $_SESSION[' PMA_token '] = md5(uniqid(rand(), true));
 107 }
 108
 109 /**
 110  * tries to secure session from hijacking and fixation
 111  * should be called before login and after successfull login
 112  * (only required if sensitive information stored in session)
 113  *
 114  * @uses    session_regenerate_id() to secure session from fixation
 115  * @uses    session_id()            to set new session id
 116  * @uses    strip_tags()            to prevent XSS attacks in SID
 117  * @uses    function_exists()       for session_regenerate_id()
 118  */
 119 function PMA_secureSession()
 120 {
 121     // prevent session fixation and XSS
 122     if (function_exists('session_regenerate_id')) {
 123         session_regenerate_id(true);
 124     } else {
 125         session_id(strip_tags(session_id()));
 126     }
 127 }
 128 ?>