c75f0e95c9
If someone is both dumb enough to blindly save an API response and to then execute the resulting file, this can be used to attack their computer. We can mitigate this by disallowing PATH_INFO in api.php URLs (because we don't make any use of them anyway) and by setting a sensible filename using a Content-Disposition header so the browser won't go guessing at the filename based on what is in the URL. Issue reported by: Abdullah Hussam Bug: T128209 Change-Id: I8526f5cc506c551edb6138d68450b6acea065e93
129 lines
4.6 KiB
PHP
129 lines
4.6 KiB
PHP
<?php
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/**
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* This file is the entry point for all API queries.
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*
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* It begins by checking whether the API is enabled on this wiki; if not,
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* it informs the user that s/he should set $wgEnableAPI to true and exits.
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* Otherwise, it constructs a new ApiMain using the parameter passed to it
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* as an argument in the URL ('?action=') and with write-enabled set to the
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* value of $wgEnableWriteAPI as specified in LocalSettings.php.
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* It then invokes "execute()" on the ApiMain object instance, which
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* produces output in the format specified in the URL.
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*
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* Copyright © 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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*/
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use MediaWiki\Logger\LegacyLogger;
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// So extensions (and other code) can check whether they're running in API mode
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define( 'MW_API', true );
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require __DIR__ . '/includes/WebStart.php';
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$starttime = microtime( true );
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// URL safety checks
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if ( !$wgRequest->checkUrlExtension() ) {
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return;
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}
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// Pathinfo can be used for stupid things. We don't support it for api.php at
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// all, so error out if it's present.
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if ( isset( $_SERVER['PATH_INFO'] ) && $_SERVER['PATH_INFO'] != '' ) {
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$correctUrl = wfAppendQuery( wfScript( 'api' ), $wgRequest->getQueryValues() );
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$correctUrl = wfExpandUrl( $correctUrl, PROTO_CANONICAL );
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header( "Location: $correctUrl", true, 301 );
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echo 'This endpoint does not support "path info", i.e. extra text between "api.php"'
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. 'and the "?". Remove any such text and try again.';
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die( 1 );
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}
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// Verify that the API has not been disabled
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if ( !$wgEnableAPI ) {
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header( $_SERVER['SERVER_PROTOCOL'] . ' 500 MediaWiki configuration Error', true, 500 );
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echo 'MediaWiki API is not enabled for this site. Add the following line to your LocalSettings.php'
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. '<pre><b>$wgEnableAPI=true;</b></pre>';
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die( 1 );
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}
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// Set a dummy $wgTitle, because $wgTitle == null breaks various things
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// In a perfect world this wouldn't be necessary
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$wgTitle = Title::makeTitle( NS_SPECIAL, 'Badtitle/dummy title for API calls set in api.php' );
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// RequestContext will read from $wgTitle, but it will also whine about it.
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// In a perfect world this wouldn't be necessary either.
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RequestContext::getMain()->setTitle( $wgTitle );
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try {
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/* Construct an ApiMain with the arguments passed via the URL. What we get back
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* is some form of an ApiMain, possibly even one that produces an error message,
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* but we don't care here, as that is handled by the constructor.
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*/
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$processor = new ApiMain( RequestContext::getMain(), $wgEnableWriteAPI );
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// Last chance hook before executing the API
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Hooks::run( 'ApiBeforeMain', [ &$processor ] );
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if ( !$processor instanceof ApiMain ) {
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throw new MWException( 'ApiBeforeMain hook set $processor to a non-ApiMain class' );
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}
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} catch ( Exception $e ) {
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// Crap. Try to report the exception in API format to be friendly to clients.
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ApiMain::handleApiBeforeMainException( $e );
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$processor = false;
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}
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// Process data & print results
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if ( $processor ) {
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$processor->execute();
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}
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// Log what the user did, for book-keeping purposes.
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$endtime = microtime( true );
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// Log the request
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if ( $wgAPIRequestLog ) {
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$items = [
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wfTimestamp( TS_MW ),
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$endtime - $starttime,
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$wgRequest->getIP(),
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$wgRequest->getHeader( 'User-agent' )
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];
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$items[] = $wgRequest->wasPosted() ? 'POST' : 'GET';
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if ( $processor ) {
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try {
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$manager = $processor->getModuleManager();
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$module = $manager->getModule( $wgRequest->getVal( 'action' ), 'action' );
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} catch ( Exception $ex ) {
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$module = null;
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}
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if ( !$module || $module->mustBePosted() ) {
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$items[] = "action=" . $wgRequest->getVal( 'action' );
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} else {
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$items[] = wfArrayToCgi( $wgRequest->getValues() );
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}
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} else {
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$items[] = "failed in ApiBeforeMain";
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}
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LegacyLogger::emit( implode( ',', $items ) . "\n", $wgAPIRequestLog );
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wfDebug( "Logged API request to $wgAPIRequestLog\n" );
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}
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$mediawiki = new MediaWiki();
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$mediawiki->doPostOutputShutdown( 'fast' );
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