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 /**
  12  * Detect compiled mode by looking for a function that only exists if compiled
  13  * in. Note that we can't use function_exists(), because it is terribly broken
  14  * under HipHop due to the "volatile" feature.
  15  */
  16 function wfDetectCompiledMode() {
  17         try {
  18                 $r = new ReflectionFunction( 'wfHipHopCompilerVersion' );
  19         } catch ( ReflectionException $e ) {
  20                 $r = false;
  21         }
  22         return $r !== false;
  23 }
  24
  25 # Protect against register_globals
  26 # This must be done before any globals are set by the code
  27 if ( ini_get( 'register_globals' ) ) {
  28         if ( isset( $_REQUEST['GLOBALS'] ) ) {
  29                 die( '<a href="http://www.hardened-php.net/globals-problem">$GLOBALS overwrite vulnerability</a>');
  30         }
  31         $verboten = array(
  32                 'GLOBALS',
  33                 '_SERVER',
  34                 'HTTP_SERVER_VARS',
  35                 '_GET',
  36                 'HTTP_GET_VARS',
  37                 '_POST',
  38                 'HTTP_POST_VARS',
  39                 '_COOKIE',
  40                 'HTTP_COOKIE_VARS',
  41                 '_FILES',
  42                 'HTTP_POST_FILES',
  43                 '_ENV',
  44                 'HTTP_ENV_VARS',
  45                 '_REQUEST',
  46                 '_SESSION',
  47                 'HTTP_SESSION_VARS'
  48         );
  49         foreach ( $_REQUEST as $name => $value ) {
  50                 if( in_array( $name, $verboten ) ) {
  51                         header( "HTTP/1.1 500 Internal Server Error" );
  52                         echo "register_globals security paranoia: trying to overwrite superglobals, aborting.";
  53                         die( -1 );
  54                 }
  55                 unset( $GLOBALS[$name] );
  56         }
  57 }
  58
  59 $wgRequestTime = microtime(true);
  60 # getrusage() does not exist on the Microsoft Windows platforms, catching this
  61 if ( function_exists ( 'getrusage' ) ) {
  62         $wgRUstart = getrusage();
  63 } else {
  64         $wgRUstart = array();
  65 }
  66 unset( $IP );
  67
  68 # Valid web server entry point, enable includes.
  69 # Please don't move this line to includes/Defines.php. This line essentially
  70 # defines a valid entry point. If you put it in includes/Defines.php, then
  71 # any script that includes it becomes an entry point, thereby defeating
  72 # its purpose.
  73 define( 'MEDIAWIKI', true );
  74
  75 # Full path to working directory.
  76 # Makes it possible to for example to have effective exclude path in apc.
  77 # Also doesn't break installations using symlinked includes, like
  78 # dirname( __FILE__ ) would do.
  79 $IP = getenv( 'MW_INSTALL_PATH' );
  80 if ( $IP === false ) {
  81         $IP = realpath( '.' );
  82 }
  83
  84 if ( wfDetectCompiledMode() ) {
  85         define( 'MW_COMPILED', 1 );
  86 }
  87
  88 if ( !defined( 'MW_COMPILED' ) ) {
  89         # Get MWInit class
  90         require_once( "$IP/includes/Init.php" );
  91
  92         # Start profiler
  93         # FIXME: rewrite wfProfileIn/wfProfileOut so that they can work in compiled mode
  94         if ( file_exists( "$IP/StartProfiler.php" ) ) {
  95                 require_once( "$IP/StartProfiler.php" );
  96         } else {
  97                 require_once( "$IP/includes/ProfilerStub.php" );
  98         }
  99
 100         # Load up some global defines.
 101         require_once( "$IP/includes/Defines.php" );
 102
 103         # Check for PHP 5
 104         if ( !function_exists( 'version_compare' )
 105                 || version_compare( phpversion(), '5.0.0' ) < 0
 106         ) {
 107                 define( 'MW_PHP4', '1' );
 108                 require( "$IP/includes/DefaultSettings.php" );
 109                 require( "$IP/includes/templates/PHP4.php" );
 110                 exit;
 111         }
 112
 113         # Start the autoloader, so that extensions can derive classes from core files
 114         require_once( "$IP/includes/AutoLoader.php" );
 115 }
 116
 117 wfProfileIn( 'WebStart.php-conf' );
 118
 119 # Load default settings
 120 require_once( MWInit::compiledPath( "includes/DefaultSettings.php" ) );
 121
 122 if ( defined( 'MW_CONFIG_CALLBACK' ) ) {
 123         # Use a callback function to configure MediaWiki
 124         MWFunction::call( MW_CONFIG_CALLBACK );
 125 } else {
 126         if ( !defined( 'MW_CONFIG_FILE' ) ) {
 127                 define('MW_CONFIG_FILE', MWInit::interpretedPath( 'LocalSettings.php' ) );
 128         }
 129
 130         # LocalSettings.php is the per site customization file. If it does not exist
 131         # the wiki installer needs to be launched or the generated file uploaded to
 132         # the root wiki directory
 133         if( !file_exists( MW_CONFIG_FILE ) ) {
 134                 require_once( "$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 if ( $wgEnableSelenium ) {
 143         require_once( MWInit::compiledPath( "includes/SeleniumWebSettings.php" ) );
 144 }
 145
 146 wfProfileOut( 'WebStart.php-conf' );
 147
 148 wfProfileIn( 'WebStart.php-ob_start' );
 149 # Initialise output buffering
 150 # Check that there is no previous output or previously set up buffers, because
 151 # that would cause us to potentially mix gzip and non-gzip output, creating a
 152 # big mess.
 153 if ( !defined( 'MW_NO_OUTPUT_BUFFER' ) && ob_get_level() == 0 ) {
 154         if ( !defined( 'MW_COMPILED' ) ) {
 155                 require_once( "$IP/includes/OutputHandler.php" );
 156         }
 157         ob_start( 'wfOutputHandler' );
 158 }
 159 wfProfileOut( 'WebStart.php-ob_start' );
 160
 161 if ( !defined( 'MW_NO_SETUP' ) ) {
 162         require_once( MWInit::compiledPath( "includes/Setup.php" ) );
 163 }
 164