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.x 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 $wgRequestTime = microtime(true);
  46 # getrusage() does not exist on the Microsoft Windows platforms, catching this
  47 if ( function_exists ( 'getrusage' ) ) {
  48         $wgRUstart = getrusage();
  49 } else {
  50         $wgRUstart = array();
  51 }
  52 unset( $IP );
  53
  54 # Valid web server entry point, enable includes.
  55 # Please don't move this line to includes/Defines.php. This line essentially
  56 # defines a valid entry point. If you put it in includes/Defines.php, then
  57 # any script that includes it becomes an entry point, thereby defeating
  58 # its purpose.
  59 define( 'MEDIAWIKI', true );
  60
  61 # Full path to working directory.
  62 # Makes it possible to for example to have effective exclude path in apc.
  63 # Also doesn't break installations using symlinked includes, like
  64 # dirname( __FILE__ ) would do.
  65 $IP = getenv( 'MW_INSTALL_PATH' );
  66 if ( $IP === false ) {
  67         $IP = realpath( '.' );
  68 }
  69
  70
  71 # Start profiler
  72 if( file_exists("$IP/StartProfiler.php") ) {
  73         require_once( "$IP/StartProfiler.php" );
  74 } else {
  75         require_once( "$IP/includes/ProfilerStub.php" );
  76 }
  77 wfProfileIn( 'WebStart.php-conf' );
  78
  79 # Load up some global defines.
  80 require_once( "$IP/includes/Defines.php" );
  81
  82 # Check for PHP 5
  83 if ( !function_exists( 'version_compare' )
  84         || version_compare( phpversion(), '5.0.0' ) < 0
  85 ) {
  86         define( 'MW_PHP4', '1' );
  87         require( "$IP/includes/DefaultSettings.php" );
  88         require( "$IP/includes/templates/PHP4.php" );
  89         exit;
  90 }
  91
  92 # Test for PHP bug which breaks PHP 5.0.x on 64-bit...
  93 # As of 1.8 this breaks lots of common operations instead
  94 # of just some rare ones like export.
  95 $borked = str_replace( 'a', 'b', array( -1 => -1 ) );
  96 if( !isset( $borked[-1] ) ) {
  97         echo "PHP 5.0.x is buggy on your 64-bit system; you must upgrade to PHP 5.1.x\n" .
  98              "or higher. ABORTING. (http://bugs.php.net/bug.php?id=34879 for details)\n";
  99         exit;
 100 }
 101
 102 # Start the autoloader, so that extensions can derive classes from core files
 103 require_once( "$IP/includes/AutoLoader.php" );
 104
 105 if ( defined( 'MW_CONFIG_CALLBACK' ) ) {
 106         # Use a callback function to configure MediaWiki
 107         require_once( "$IP/includes/DefaultSettings.php" );
 108
 109         $callback = MW_CONFIG_CALLBACK;
 110         if ( strpos( $callback, '::' ) !== false ) {
 111                 $callback = explode( '::', $callback, 2);
 112         }
 113         call_user_func( $callback );
 114 } else {
 115         # LocalSettings.php is the per site customization file. If it does not exit
 116         # the wiki installer need to be launched or the generated file moved from
 117         # ./config/ to ./
 118         if( !file_exists( "$IP/LocalSettings.php" ) ) {
 119                 require_once( "$IP/includes/DefaultSettings.php" ); # used for printing the version
 120                 require_once( "$IP/includes/templates/NoLocalSettings.php" );
 121                 die();
 122         }
 123
 124         # Include site settings. $IP may be changed (hopefully before the AutoLoader is invoked)
 125         require_once( "$IP/LocalSettings.php" );
 126 }
 127 wfProfileOut( 'WebStart.php-conf' );
 128
 129 wfProfileIn( 'WebStart.php-ob_start' );
 130 # Initialise output buffering
 131
 132 # Check that there is no previous output or previously set up buffers, because
 133 # that would cause us to potentially mix gzip and non-gzip output, creating a
 134 # big mess.
 135 # In older versions of PHP ob_get_level() returns 0 if there is no buffering or
 136 # previous output, in newer versions the default output buffer is always set up
 137 # and ob_get_level() returns 1. In this case we check that the buffer is empty.
 138 # FIXME: Check that this is the right way to handle this
 139 if ( !defined( 'MW_NO_OUTPUT_BUFFER' ) && ( ob_get_level() == 0 || ( ob_get_level() == 1 && ob_get_contents() === '' ) ) ) {
 140         require_once( "$IP/includes/OutputHandler.php" );
 141         ob_start( 'wfOutputHandler' );
 142 }
 143 wfProfileOut( 'WebStart.php-ob_start' );
 144
 145 if ( !defined( 'MW_NO_SETUP' ) ) {
 146         require_once( "$IP/includes/Setup.php" );
 147 }