includes/WebStart.php

   1 <?php
   2 /**
   3  * This does the initial set up for a web request.
   4  * It does some security checks, starts the profiler and loads the
   5  * configuration, and optionally loads Setup.php depending on whether
   6  * MW_NO_SETUP is defined.
   7  *
   8  * Setup.php (if loaded) then sets up GlobalFunctions, the AutoLoader,
   9  * and the configuration globals (though not $wgTitle).
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; if not, write to the Free Software Foundation, Inc.,
  23  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  24  * http://www.gnu.org/copyleft/gpl.html
  25  *
  26  * @file
  27  */
  28
  29 # Protect against register_globals
  30 # This must be done before any globals are set by the code
  31 if ( ini_get( 'register_globals' ) ) {
  32         if ( isset( $_REQUEST['GLOBALS'] ) || isset( $_FILES['GLOBALS'] ) ) {
  33                 die( '<a href="http://www.hardened-php.net/globals-problem">'
  34                         . '$GLOBALS overwrite vulnerability</a>' );
  35         }
  36
  37         $verboten = array(
  38                 'GLOBALS',
  39                 '_SERVER',
  40                 'HTTP_SERVER_VARS',
  41                 '_GET',
  42                 'HTTP_GET_VARS',
  43                 '_POST',
  44                 'HTTP_POST_VARS',
  45                 '_COOKIE',
  46                 'HTTP_COOKIE_VARS',
  47                 '_FILES',
  48                 'HTTP_POST_FILES',
  49                 '_ENV',
  50                 'HTTP_ENV_VARS',
  51                 '_REQUEST',
  52                 '_SESSION',
  53                 'HTTP_SESSION_VARS'
  54         );
  55
  56         foreach ( $_REQUEST as $name => $value ) {
  57                 if ( in_array( $name, $verboten ) ) {
  58                         header( "HTTP/1.1 500 Internal Server Error" );
  59                         echo "register_globals security paranoia: trying to overwrite superglobals, aborting.";
  60                         die( -1 );
  61                 }
  62                 unset( $GLOBALS[$name] );
  63         }
  64 }
  65
  66 # bug 15461: Make IE8 turn off content sniffing. Everybody else should ignore this
  67 # We're adding it here so that it's *always* set, even for alternate entry
  68 # points and when $wgOut gets disabled or overridden.
  69 header( 'X-Content-Type-Options: nosniff' );
  70
  71 $wgRequestTime = microtime( true );
  72 # getrusage() does not exist on the Microsoft Windows platforms, catching this
  73 if ( function_exists ( 'getrusage' ) ) {
  74         $wgRUstart = getrusage();
  75 } else {
  76         $wgRUstart = array();
  77 }
  78 unset( $IP );
  79
  80 # Valid web server entry point, enable includes.
  81 # Please don't move this line to includes/Defines.php. This line essentially
  82 # defines a valid entry point. If you put it in includes/Defines.php, then
  83 # any script that includes it becomes an entry point, thereby defeating
  84 # its purpose.
  85 define( 'MEDIAWIKI', true );
  86
  87 # Full path to working directory.
  88 # Makes it possible to for example to have effective exclude path in apc.
  89 # __DIR__ breaks symlinked includes, but realpath() returns false
  90 # if we don't have permissions on parent directories.
  91 $IP = getenv( 'MW_INSTALL_PATH' );
  92 if ( $IP === false ) {
  93         if ( realpath( '.' ) ) {
  94                 $IP = realpath( '.' );
  95         } else {
  96                 $IP = dirname( __DIR__ );
  97         }
  98 }
  99
 100 # Start the autoloader, so that extensions can derive classes from core files
 101 require_once "$IP/includes/AutoLoader.php";
 102
 103 # Load the profiler
 104 require_once "$IP/includes/profiler/Profiler.php";
 105
 106 # Load up some global defines.
 107 require_once "$IP/includes/Defines.php";
 108
 109 # Start the profiler
 110 $wgProfiler = array();
 111 if ( file_exists( "$IP/StartProfiler.php" ) ) {
 112         require "$IP/StartProfiler.php";
 113 }
 114
 115 wfProfileIn( 'WebStart.php-conf' );
 116
 117 # Load default settings
 118 require_once "$IP/includes/DefaultSettings.php";
 119
 120 # Load composer's autoloader if present
 121 if ( is_readable( "$IP/vendor/autoload.php" ) ) {
 122         require_once "$IP/vendor/autoload.php";
 123 }
 124
 125 if ( defined( 'MW_CONFIG_CALLBACK' ) ) {
 126         # Use a callback function to configure MediaWiki
 127         call_user_func( MW_CONFIG_CALLBACK );
 128 } else {
 129         if ( !defined( 'MW_CONFIG_FILE' ) ) {
 130                 define( 'MW_CONFIG_FILE', "$IP/LocalSettings.php" );
 131         }
 132
 133         # LocalSettings.php is the per site customization file. If it does not exist
 134         # the wiki installer needs to be launched or the generated file uploaded to
 135         # the root wiki directory. Give a hint, if it is not readable by the server.
 136         if ( !is_readable( MW_CONFIG_FILE ) ) {
 137                 require_once "$IP/includes/templates/NoLocalSettings.php";
 138                 die();
 139         }
 140
 141         # Include site settings. $IP may be changed (hopefully before the AutoLoader is invoked)
 142         require_once MW_CONFIG_FILE;
 143 }
 144
 145 wfProfileOut( 'WebStart.php-conf' );
 146
 147 wfProfileIn( 'WebStart.php-ob_start' );
 148 # Initialise output buffering
 149 # Check that there is no previous output or previously set up buffers, because
 150 # that would cause us to potentially mix gzip and non-gzip output, creating a
 151 # big mess.
 152 if ( !defined( 'MW_NO_OUTPUT_BUFFER' ) && ob_get_level() == 0 ) {
 153         require_once "$IP/includes/OutputHandler.php";
 154         ob_start( 'wfOutputHandler' );
 155 }
 156 wfProfileOut( 'WebStart.php-ob_start' );
 157
 158 if ( !defined( 'MW_NO_SETUP' ) ) {
 159         require_once "$IP/includes/Setup.php";
 160 }