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  * @file
   9  */
  10
  11 # Protect against register_globals
  12 # This must be done before any globals are set by the code
  13 if ( ini_get( 'register_globals' ) ) {
  14         if ( isset( $_REQUEST['GLOBALS'] ) ) {
  15                 die( '<a href="http://www.hardened-php.net/globals-problem">$GLOBALS overwrite vulnerability</a>');
  16         }
  17         $verboten = array(
  18                 'GLOBALS',
  19                 '_SERVER',
  20                 'HTTP_SERVER_VARS',
  21                 '_GET',
  22                 'HTTP_GET_VARS',
  23                 '_POST',
  24                 'HTTP_POST_VARS',
  25                 '_COOKIE',
  26                 'HTTP_COOKIE_VARS',
  27                 '_FILES',
  28                 'HTTP_POST_FILES',
  29                 '_ENV',
  30                 'HTTP_ENV_VARS',
  31                 '_REQUEST',
  32                 '_SESSION',
  33                 'HTTP_SESSION_VARS'
  34         );
  35         foreach ( $_REQUEST as $name => $value ) {
  36                 if( in_array( $name, $verboten ) ) {
  37                         header( "HTTP/1.1 500 Internal Server Error" );
  38                         echo "register_globals security paranoia: trying to overwrite superglobals, aborting.";
  39                         die( -1 );
  40                 }
  41                 unset( $GLOBALS[$name] );
  42         }
  43 }
  44
  45 # bug 15461: Make IE8 turn off content sniffing. Everbody else should ignore this
  46 # We're adding it here so that it's *always* set, even for alternate entry
  47 # points and when $wgOut gets disabled or overridden.
  48 header( 'X-Content-Type-Options: nosniff' );
  49
  50 $wgRequestTime = microtime(true);
  51 # getrusage() does not exist on the Microsoft Windows platforms, catching this
  52 if ( function_exists ( 'getrusage' ) ) {
  53         $wgRUstart = getrusage();
  54 } else {
  55         $wgRUstart = array();
  56 }
  57 unset( $IP );
  58
  59 # Valid web server entry point, enable includes.
  60 # Please don't move this line to includes/Defines.php. This line essentially
  61 # defines a valid entry point. If you put it in includes/Defines.php, then
  62 # any script that includes it becomes an entry point, thereby defeating
  63 # its purpose.
  64 define( 'MEDIAWIKI', true );
  65
  66 # Full path to working directory.
  67 # Makes it possible to for example to have effective exclude path in apc.
  68 # Also doesn't break installations using symlinked includes, like
  69 # dirname( __FILE__ ) would do.
  70 $IP = getenv( 'MW_INSTALL_PATH' );
  71 if ( $IP === false ) {
  72         $IP = realpath( '.' );
  73 }
  74
  75 if ( isset( $_SERVER['MW_COMPILED'] ) ) {
  76         define( 'MW_COMPILED', 1 );
  77 } else {
  78         # Get MWInit class
  79         require_once( "$IP/includes/Init.php" );
  80
  81         # Start the autoloader, so that extensions can derive classes from core files
  82         require_once( "$IP/includes/AutoLoader.php" );
  83
  84         # Load the profiler
  85         require_once( "$IP/includes/profiler/Profiler.php" );
  86
  87         # Load up some global defines.
  88         require_once( "$IP/includes/Defines.php" );
  89 }
  90
  91 # Start the profiler
  92 $wgProfiler = array();
  93 if ( file_exists( "$IP/StartProfiler.php" ) ) {
  94         require( "$IP/StartProfiler.php" );
  95 }
  96
  97 wfProfileIn( 'WebStart.php-conf' );
  98
  99 # Load default settings
 100 require_once( MWInit::compiledPath( "includes/DefaultSettings.php" ) );
 101
 102 if ( defined( 'MW_CONFIG_CALLBACK' ) ) {
 103         # Use a callback function to configure MediaWiki
 104         MWFunction::call( MW_CONFIG_CALLBACK );
 105 } else {
 106         if ( !defined( 'MW_CONFIG_FILE' ) ) {
 107                 define('MW_CONFIG_FILE', MWInit::interpretedPath( 'LocalSettings.php' ) );
 108         }
 109
 110         # LocalSettings.php is the per site customization file. If it does not exist
 111         # the wiki installer needs to be launched or the generated file uploaded to
 112         # the root wiki directory
 113         if( !file_exists( MW_CONFIG_FILE ) ) {
 114                 require_once( "$IP/includes/templates/NoLocalSettings.php" );
 115                 die();
 116         }
 117
 118         # Include site settings. $IP may be changed (hopefully before the AutoLoader is invoked)
 119         require_once( MW_CONFIG_FILE );
 120 }
 121
 122 if ( $wgEnableSelenium ) {
 123         require_once( MWInit::compiledPath( "includes/SeleniumWebSettings.php" ) );
 124 }
 125
 126 wfProfileOut( 'WebStart.php-conf' );
 127
 128 wfProfileIn( 'WebStart.php-ob_start' );
 129 # Initialise output buffering
 130 # Check that there is no previous output or previously set up buffers, because
 131 # that would cause us to potentially mix gzip and non-gzip output, creating a
 132 # big mess.
 133 if ( !defined( 'MW_NO_OUTPUT_BUFFER' ) && ob_get_level() == 0 ) {
 134         if ( !defined( 'MW_COMPILED' ) ) {
 135                 require_once( "$IP/includes/OutputHandler.php" );
 136         }
 137         ob_start( 'wfOutputHandler' );
 138 }
 139 wfProfileOut( 'WebStart.php-ob_start' );
 140
 141 if ( !defined( 'MW_NO_SETUP' ) ) {
 142         require_once( MWInit::compiledPath( "includes/Setup.php" ) );
 143 }
 144