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 # bug 15461: Make IE8 turn off content sniffing. Everbody else should ignore this
  60 # We're adding it here so that it's *always* set, even for alternate entry
  61 # points and when $wgOut gets disabled or overridden.
  62 header( 'X-Content-Type-Options: nosniff' );
  63
  64 $wgRequestTime = microtime(true);
  65 # getrusage() does not exist on the Microsoft Windows platforms, catching this
  66 if ( function_exists ( 'getrusage' ) ) {
  67         $wgRUstart = getrusage();
  68 } else {
  69         $wgRUstart = array();
  70 }
  71 unset( $IP );
  72
  73 # Valid web server entry point, enable includes.
  74 # Please don't move this line to includes/Defines.php. This line essentially
  75 # defines a valid entry point. If you put it in includes/Defines.php, then
  76 # any script that includes it becomes an entry point, thereby defeating
  77 # its purpose.
  78 define( 'MEDIAWIKI', true );
  79
  80 # Full path to working directory.
  81 # Makes it possible to for example to have effective exclude path in apc.
  82 # Also doesn't break installations using symlinked includes, like
  83 # dirname( __FILE__ ) would do.
  84 $IP = getenv( 'MW_INSTALL_PATH' );
  85 if ( $IP === false ) {
  86         $IP = realpath( '.' );
  87 }
  88
  89 if ( wfDetectCompiledMode() ) {
  90         define( 'MW_COMPILED', 1 );
  91 }
  92
  93 if ( !defined( 'MW_COMPILED' ) ) {
  94         # Get MWInit class
  95         require_once( "$IP/includes/Init.php" );
  96
  97         # Start the autoloader, so that extensions can derive classes from core files
  98         require_once( "$IP/includes/AutoLoader.php" );
  99
 100         # Start profiler
 101         # @todo FIXME: Rewrite wfProfileIn/wfProfileOut so that they can work in compiled mode
 102         require_once( "$IP/includes/profiler/Profiler.php" );
 103         if ( file_exists( "$IP/StartProfiler.php" ) ) {
 104                 require_once( "$IP/StartProfiler.php" );
 105         }
 106
 107         # Load up some global defines.
 108         require_once( "$IP/includes/Defines.php" );
 109 }
 110
 111 wfProfileIn( 'WebStart.php-conf' );
 112
 113 # Load default settings
 114 require_once( MWInit::compiledPath( "includes/DefaultSettings.php" ) );
 115
 116 if ( defined( 'MW_CONFIG_CALLBACK' ) ) {
 117         # Use a callback function to configure MediaWiki
 118         MWFunction::call( MW_CONFIG_CALLBACK );
 119 } else {
 120         if ( !defined( 'MW_CONFIG_FILE' ) ) {
 121                 define('MW_CONFIG_FILE', MWInit::interpretedPath( 'LocalSettings.php' ) );
 122         }
 123
 124         # LocalSettings.php is the per site customization file. If it does not exist
 125         # the wiki installer needs to be launched or the generated file uploaded to
 126         # the root wiki directory
 127         if( !file_exists( MW_CONFIG_FILE ) ) {
 128                 $script = $_SERVER['SCRIPT_NAME'];
 129                 $path = htmlspecialchars( str_replace( '//', '/', pathinfo( $script, PATHINFO_DIRNAME ) ) );
 130                 $ext = htmlspecialchars( pathinfo( $script, PATHINFO_EXTENSION ) );
 131
 132                 # Check to see if the installer is running
 133                 if ( !function_exists( 'session_name' ) ) {
 134                         $installerStarted = false;
 135                 } else {
 136                         session_name( 'mw_installer_session' );
 137                         $oldReporting = error_reporting( E_ALL & ~E_NOTICE );
 138                         $success = session_start();
 139                         error_reporting( $oldReporting );
 140                         $installerStarted = ( $success && isset( $_SESSION['installData'] ) );
 141                 }
 142
 143                 $please = $installerStarted
 144                         ? "Please <a href=\"$path/mw-config/index.$ext\"> complete the installation</a> and download LocalSettings.php."
 145                         : "Please <a href=\"$path/mw-config/index.$ext\"> set up the wiki</a> first.";
 146
 147                 wfDie( "<p>LocalSettings.php not found.</p><p>$please</p>" );
 148         }
 149
 150         # Include site settings. $IP may be changed (hopefully before the AutoLoader is invoked)
 151         require_once( MW_CONFIG_FILE );
 152 }
 153
 154 if ( $wgEnableSelenium ) {
 155         require_once( MWInit::compiledPath( "includes/SeleniumWebSettings.php" ) );
 156 }
 157
 158 wfProfileOut( 'WebStart.php-conf' );
 159
 160 wfProfileIn( 'WebStart.php-ob_start' );
 161 # Initialise output buffering
 162 # Check that there is no previous output or previously set up buffers, because
 163 # that would cause us to potentially mix gzip and non-gzip output, creating a
 164 # big mess.
 165 if ( !defined( 'MW_NO_OUTPUT_BUFFER' ) && ob_get_level() == 0 ) {
 166         if ( !defined( 'MW_COMPILED' ) ) {
 167                 require_once( "$IP/includes/OutputHandler.php" );
 168         }
 169         ob_start( 'wfOutputHandler' );
 170 }
 171 wfProfileOut( 'WebStart.php-ob_start' );
 172
 173 if ( !defined( 'MW_NO_SETUP' ) ) {
 174         require_once( MWInit::compiledPath( "includes/Setup.php" ) );
 175 }
 176