includes/WebStart.php

   1 <?php
   2 /**
   3  * This does the initial setup 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  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  * http://www.gnu.org/copyleft/gpl.html
  22  *
  23  * @file
  24  */
  25
  26 # Protect against register_globals
  27 # This must be done before any globals are set by the code
  28 if ( ini_get( 'register_globals' ) ) {
  29         if ( isset( $_REQUEST['GLOBALS'] ) || isset( $_FILES['GLOBALS'] ) ) {
  30                 die( '<a href="http://www.hardened-php.net/globals-problem">$GLOBALS overwrite vulnerability</a>' );
  31         }
  32         $verboten = array(
  33                 'GLOBALS',
  34                 '_SERVER',
  35                 'HTTP_SERVER_VARS',
  36                 '_GET',
  37                 'HTTP_GET_VARS',
  38                 '_POST',
  39                 'HTTP_POST_VARS',
  40                 '_COOKIE',
  41                 'HTTP_COOKIE_VARS',
  42                 '_FILES',
  43                 'HTTP_POST_FILES',
  44                 '_ENV',
  45                 'HTTP_ENV_VARS',
  46                 '_REQUEST',
  47                 '_SESSION',
  48                 'HTTP_SESSION_VARS'
  49         );
  50         foreach ( $_REQUEST as $name => $value ) {
  51                 if( in_array( $name, $verboten ) ) {
  52                         header( "HTTP/1.1 500 Internal Server Error" );
  53                         echo "register_globals security paranoia: trying to overwrite superglobals, aborting.";
  54                         die( -1 );
  55                 }
  56                 unset( $GLOBALS[$name] );
  57         }
  58 }
  59
  60 # bug 15461: Make IE8 turn off content sniffing. Everbody else should ignore this
  61 # We're adding it here so that it's *always* set, even for alternate entry
  62 # points and when $wgOut gets disabled or overridden.
  63 header( 'X-Content-Type-Options: nosniff' );
  64
  65 $wgRequestTime = microtime( true );
  66 # getrusage() does not exist on the Microsoft Windows platforms, catching this
  67 if ( function_exists ( 'getrusage' ) ) {
  68         $wgRUstart = getrusage();
  69 } else {
  70         $wgRUstart = array();
  71 }
  72 unset( $IP );
  73
  74 # Valid web server entry point, enable includes.
  75 # Please don't move this line to includes/Defines.php. This line essentially
  76 # defines a valid entry point. If you put it in includes/Defines.php, then
  77 # any script that includes it becomes an entry point, thereby defeating
  78 # its purpose.
  79 define( 'MEDIAWIKI', true );
  80
  81 # Full path to working directory.
  82 # Makes it possible to for example to have effective exclude path in apc.
  83 # __DIR__ breaks symlinked includes, but realpath() returns false
  84 # if we don't have permissions on parent directories.
  85 $IP = getenv( 'MW_INSTALL_PATH' );
  86 if ( $IP === false ) {
  87         if( realpath( '.' ) ) {
  88                 $IP = realpath( '.' );
  89         } else {
  90                 $IP = dirname( __DIR__ );
  91         }
  92 }
  93
  94 if ( isset( $_SERVER['MW_COMPILED'] ) ) {
  95         define( 'MW_COMPILED', 1 );
  96 } else {
  97         # Get MWInit class
  98         require_once( "$IP/includes/Init.php" );
  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
 110 # Start the profiler
 111 $wgProfiler = array();
 112 if ( file_exists( "$IP/StartProfiler.php" ) ) {
 113         require( "$IP/StartProfiler.php" );
 114 }
 115
 116 wfProfileIn( 'WebStart.php-conf' );
 117
 118 # Load default settings
 119 require_once( MWInit::compiledPath( "includes/DefaultSettings.php" ) );
 120
 121 if ( defined( 'MW_CONFIG_CALLBACK' ) ) {
 122         # Use a callback function to configure MediaWiki
 123         MWFunction::call( MW_CONFIG_CALLBACK );
 124 } else {
 125         if ( !defined( 'MW_CONFIG_FILE' ) ) {
 126                 define( 'MW_CONFIG_FILE', MWInit::interpretedPath( 'LocalSettings.php' ) );
 127         }
 128
 129         # LocalSettings.php is the per site customization file. If it does not exist
 130         # the wiki installer needs to be launched or the generated file uploaded to
 131         # the root wiki directory
 132         if( !file_exists( MW_CONFIG_FILE ) ) {
 133                 require_once( "$IP/includes/templates/NoLocalSettings.php" );
 134                 die();
 135         }
 136
 137         # Include site settings. $IP may be changed (hopefully before the AutoLoader is invoked)
 138         require_once( MW_CONFIG_FILE );
 139 }
 140
 141 if ( $wgEnableSelenium ) {
 142         require_once( MWInit::compiledPath( "includes/SeleniumWebSettings.php" ) );
 143 }
 144
 145 wfProfileOut( 'WebStart.php-conf' );
 146
 147 wfProfileIn( 'WebStart.php-ob_start' );
 148 # Initialise output buffering
 149 # Check that there is no previous output or previously set up buffers, because
 150 # that would cause us to potentially mix gzip and non-gzip output, creating a
 151 # big mess.
 152 if ( !defined( 'MW_NO_OUTPUT_BUFFER' ) && ob_get_level() == 0 ) {
 153         if ( !defined( 'MW_COMPILED' ) ) {
 154                 require_once( "$IP/includes/OutputHandler.php" );
 155         }
 156         ob_start( 'wfOutputHandler' );
 157 }
 158 wfProfileOut( 'WebStart.php-ob_start' );
 159
 160 if ( !defined( 'MW_NO_SETUP' ) ) {
 161         require_once( MWInit::compiledPath( "includes/Setup.php" ) );
 162 }