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( $_FILES['GLOBALS'] ) ) {
  33                 die( '<a href="http://www.hardened-php.net/globals-problem">$GLOBALS overwrite vulnerability</a>' );
  34         }
  35         $verboten = array(
  36                 'GLOBALS',
  37                 '_SERVER',
  38                 'HTTP_SERVER_VARS',
  39                 '_GET',
  40                 'HTTP_GET_VARS',
  41                 '_POST',
  42                 'HTTP_POST_VARS',
  43                 '_COOKIE',
  44                 'HTTP_COOKIE_VARS',
  45                 '_FILES',
  46                 'HTTP_POST_FILES',
  47                 '_ENV',
  48                 'HTTP_ENV_VARS',
  49                 '_REQUEST',
  50                 '_SESSION',
  51                 'HTTP_SESSION_VARS'
  52         );
  53         foreach ( $_REQUEST as $name => $value ) {
  54                 if ( in_array( $name, $verboten ) ) {
  55                         header( "HTTP/1.1 500 Internal Server Error" );
  56                         echo "register_globals security paranoia: trying to overwrite superglobals, aborting.";
  57                         die( -1 );
  58                 }
  59                 unset( $GLOBALS[$name] );
  60         }
  61 }
  62
  63 # bug 15461: Make IE8 turn off content sniffing. Everybody else should ignore this
  64 # We're adding it here so that it's *always* set, even for alternate entry
  65 # points and when $wgOut gets disabled or overridden.
  66 header( 'X-Content-Type-Options: nosniff' );
  67
  68 $wgRequestTime = microtime( true );
  69 # getrusage() does not exist on the Microsoft Windows platforms, catching this
  70 if ( function_exists ( 'getrusage' ) ) {
  71         $wgRUstart = getrusage();
  72 } else {
  73         $wgRUstart = array();
  74 }
  75 unset( $IP );
  76
  77 # Valid web server entry point, enable includes.
  78 # Please don't move this line to includes/Defines.php. This line essentially
  79 # defines a valid entry point. If you put it in includes/Defines.php, then
  80 # any script that includes it becomes an entry point, thereby defeating
  81 # its purpose.
  82 define( 'MEDIAWIKI', true );
  83
  84 # Full path to working directory.
  85 # Makes it possible to for example to have effective exclude path in apc.
  86 # __DIR__ breaks symlinked includes, but realpath() returns false
  87 # if we don't have permissions on parent directories.
  88 $IP = getenv( 'MW_INSTALL_PATH' );
  89 if ( $IP === false ) {
  90         if ( realpath( '.' ) ) {
  91                 $IP = realpath( '.' );
  92         } else {
  93                 $IP = dirname( __DIR__ );
  94         }
  95 }
  96
  97 # Start the autoloader, so that extensions can derive classes from core files
  98 require_once "$IP/includes/AutoLoader.php";
  99
 100 # Load the profiler
 101 require_once "$IP/includes/profiler/Profiler.php";
 102
 103 # Load up some global defines.
 104 require_once "$IP/includes/Defines.php";
 105
 106 # Start the profiler
 107 $wgProfiler = array();
 108 if ( file_exists( "$IP/StartProfiler.php" ) ) {
 109         require "$IP/StartProfiler.php";
 110 }
 111
 112 wfProfileIn( 'WebStart.php-conf' );
 113
 114 # Load default settings
 115 require_once "$IP/includes/DefaultSettings.php";
 116
 117 # Load composer's autoloader if present
 118 if ( is_readable( "$IP/vendor/autoload.php" ) ) {
 119         require_once "$IP/vendor/autoload.php";
 120 }
 121
 122 if ( defined( 'MW_CONFIG_CALLBACK' ) ) {
 123         # Use a callback function to configure MediaWiki
 124         call_user_func( MW_CONFIG_CALLBACK );
 125 } else {
 126         if ( !defined( 'MW_CONFIG_FILE' ) ) {
 127                 define( 'MW_CONFIG_FILE', "$IP/LocalSettings.php" );
 128         }
 129
 130         # LocalSettings.php is the per site customization file. If it does not exist
 131         # the wiki installer needs to be launched or the generated file uploaded to
 132         # the root wiki directory. Give a hint, if it is not readable by the server.
 133         if ( !is_readable( MW_CONFIG_FILE ) ) {
 134                 require_once "$IP/includes/templates/NoLocalSettings.php";
 135                 die();
 136         }
 137
 138         # Include site settings. $IP may be changed (hopefully before the AutoLoader is invoked)
 139         require_once MW_CONFIG_FILE;
 140 }
 141
 142 wfProfileOut( 'WebStart.php-conf' );
 143
 144 wfProfileIn( 'WebStart.php-ob_start' );
 145 # Initialise output buffering
 146 # Check that there is no previous output or previously set up buffers, because
 147 # that would cause us to potentially mix gzip and non-gzip output, creating a
 148 # big mess.
 149 if ( !defined( 'MW_NO_OUTPUT_BUFFER' ) && ob_get_level() == 0 ) {
 150         require_once "$IP/includes/OutputHandler.php";
 151         ob_start( 'wfOutputHandler' );
 152 }
 153 wfProfileOut( 'WebStart.php-ob_start' );
 154
 155 if ( !defined( 'MW_NO_SETUP' ) ) {
 156         require_once "$IP/includes/Setup.php";
 157 }