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( "$IP/includes/AutoLoader.php" );
  83
  84         # Start profiler
  85         # @todo FIXME: Rewrite wfProfileIn/wfProfileOut so that they can work in compiled mode
  86         require_once( "$IP/includes/profiler/Profiler.php" );
  87         if ( file_exists( "$IP/StartProfiler.php" ) ) {
  88                 require_once( "$IP/StartProfiler.php" );
  89         }
  90
  91         # Load up some global defines.
  92         require_once( "$IP/includes/Defines.php" );
  93 }
  94
  95 wfProfileIn( 'WebStart.php-conf' );
  96
  97 # Load default settings
  98 require_once( MWInit::compiledPath( "includes/DefaultSettings.php" ) );
  99
 100 if ( defined( 'MW_CONFIG_CALLBACK' ) ) {
 101         # Use a callback function to configure MediaWiki
 102         MWFunction::call( MW_CONFIG_CALLBACK );
 103 } else {
 104         if ( !defined( 'MW_CONFIG_FILE' ) ) {
 105                 define('MW_CONFIG_FILE', MWInit::interpretedPath( 'LocalSettings.php' ) );
 106         }
 107
 108         # LocalSettings.php is the per site customization file. If it does not exist
 109         # the wiki installer needs to be launched or the generated file uploaded to
 110         # the root wiki directory
 111         if( !file_exists( MW_CONFIG_FILE ) ) {
 112                 $script = $_SERVER['SCRIPT_NAME'];
 113                 $path = htmlspecialchars( str_replace( '//', '/', pathinfo( $script, PATHINFO_DIRNAME ) ) );
 114                 $ext = htmlspecialchars( pathinfo( $script, PATHINFO_EXTENSION ) );
 115
 116                 # Check to see if the installer is running
 117                 if ( !function_exists( 'session_name' ) ) {
 118                         $installerStarted = false;
 119                 } else {
 120                         session_name( 'mw_installer_session' );
 121                         $oldReporting = error_reporting( E_ALL & ~E_NOTICE );
 122                         $success = session_start();
 123                         error_reporting( $oldReporting );
 124                         $installerStarted = ( $success && isset( $_SESSION['installData'] ) );
 125                 }
 126
 127                 $please = $installerStarted
 128                         ? "Please <a href=\"$path/mw-config/index.$ext\"> complete the installation</a> and download LocalSettings.php."
 129                         : "Please <a href=\"$path/mw-config/index.$ext\"> set up the wiki</a> first.";
 130
 131                 wfDie( "<p>LocalSettings.php not found.</p><p>$please</p>" );
 132         }
 133
 134         # Include site settings. $IP may be changed (hopefully before the AutoLoader is invoked)
 135         require_once( MW_CONFIG_FILE );
 136 }
 137
 138 if ( $wgEnableSelenium ) {
 139         require_once( MWInit::compiledPath( "includes/SeleniumWebSettings.php" ) );
 140 }
 141
 142 wfProfileOut( 'WebStart.php-conf' );
 143
 144 wfProfileIn( 'WebStart.php-ob_start' );
 145 # Initialise output buffering
 146 # Check that there is no previous output or previously set up buffers, because
 147 # that would cause us to potentially mix gzip and non-gzip output, creating a
 148 # big mess.
 149 if ( !defined( 'MW_NO_OUTPUT_BUFFER' ) && ob_get_level() == 0 ) {
 150         if ( !defined( 'MW_COMPILED' ) ) {
 151                 require_once( "$IP/includes/OutputHandler.php" );
 152         }
 153         ob_start( 'wfOutputHandler' );
 154 }
 155 wfProfileOut( 'WebStart.php-ob_start' );
 156
 157 if ( !defined( 'MW_NO_SETUP' ) ) {
 158         require_once( MWInit::compiledPath( "includes/Setup.php" ) );
 159 }
 160