diff options
author | Yaco <franco@reevo.org> | 2020-06-04 11:01:00 -0300 |
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committer | Yaco <franco@reevo.org> | 2020-06-04 11:01:00 -0300 |
commit | fc7369835258467bf97eb64f184b93691f9a9fd5 (patch) | |
tree | daabd60089d2dd76d9f5fb416b005fbe159c799d /www/wiki/img_auth.php |
first commit
Diffstat (limited to 'www/wiki/img_auth.php')
-rw-r--r-- | www/wiki/img_auth.php | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/www/wiki/img_auth.php b/www/wiki/img_auth.php new file mode 100644 index 00000000..20528090 --- /dev/null +++ b/www/wiki/img_auth.php @@ -0,0 +1,222 @@ +<?php +/** + * Image authorisation script + * + * To use this, see https://www.mediawiki.org/wiki/Manual:Image_Authorization + * + * - Set $wgUploadDirectory to a non-public directory (not web accessible) + * - Set $wgUploadPath to point to this file + * + * Optional Parameters + * + * - Set $wgImgAuthDetails = true if you want the reason the access was denied messages to + * be displayed instead of just the 403 error (doesn't work on IE anyway), + * otherwise it will only appear in error logs + * + * For security reasons, you usually don't want your user to know *why* access was denied, + * just that it was. If you want to change this, you can set $wgImgAuthDetails to 'true' + * in localsettings.php and it will give the user the reason why access was denied. + * + * Your server needs to support PATH_INFO; CGI-based configurations usually don't. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * http://www.gnu.org/copyleft/gpl.html + * + * @file + */ + +define( 'MW_NO_OUTPUT_COMPRESSION', 1 ); +require __DIR__ . '/includes/WebStart.php'; + +# Set action base paths so that WebRequest::getPathInfo() +# recognizes the "X" as the 'title' in ../img_auth.php/X urls. +$wgArticlePath = false; # Don't let a "/*" article path clober our action path +$wgActionPaths = [ "$wgUploadPath/" ]; + +wfImageAuthMain(); + +$mediawiki = new MediaWiki(); +$mediawiki->doPostOutputShutdown( 'fast' ); + +function wfImageAuthMain() { + global $wgImgAuthUrlPathMap; + + $request = RequestContext::getMain()->getRequest(); + $publicWiki = in_array( 'read', User::getGroupPermissions( [ '*' ] ), true ); + + // Get the requested file path (source file or thumbnail) + $matches = WebRequest::getPathInfo(); + if ( !isset( $matches['title'] ) ) { + wfForbidden( 'img-auth-accessdenied', 'img-auth-nopathinfo' ); + return; + } + $path = $matches['title']; + if ( $path && $path[0] !== '/' ) { + // Make sure $path has a leading / + $path = "/" . $path; + } + + // Check for T30235: QUERY_STRING overriding the correct extension + $whitelist = []; + $extension = FileBackend::extensionFromPath( $path, 'rawcase' ); + if ( $extension != '' ) { + $whitelist[] = $extension; + } + if ( !$request->checkUrlExtension( $whitelist ) ) { + return; + } + + // Various extensions may have their own backends that need access. + // Check if there is a special backend and storage base path for this file. + foreach ( $wgImgAuthUrlPathMap as $prefix => $storageDir ) { + $prefix = rtrim( $prefix, '/' ) . '/'; // implicit trailing slash + if ( strpos( $path, $prefix ) === 0 ) { + $be = FileBackendGroup::singleton()->backendFromPath( $storageDir ); + $filename = $storageDir . substr( $path, strlen( $prefix ) ); // strip prefix + // Check basic user authorization + if ( !RequestContext::getMain()->getUser()->isAllowed( 'read' ) ) { + wfForbidden( 'img-auth-accessdenied', 'img-auth-noread', $path ); + return; + } + if ( $be->fileExists( [ 'src' => $filename ] ) ) { + wfDebugLog( 'img_auth', "Streaming `" . $filename . "`." ); + $be->streamFile( [ 'src' => $filename ], + [ 'Cache-Control: private', 'Vary: Cookie' ] ); + } else { + wfForbidden( 'img-auth-accessdenied', 'img-auth-nofile', $path ); + } + return; + } + } + + // Get the local file repository + $repo = RepoGroup::singleton()->getRepo( 'local' ); + $zone = strstr( ltrim( $path, '/' ), '/', true ); + + // Get the full file storage path and extract the source file name. + // (e.g. 120px-Foo.png => Foo.png or page2-120px-Foo.png => Foo.png). + // This only applies to thumbnails/transcoded, and each of them should + // be under a folder that has the source file name. + if ( $zone === 'thumb' || $zone === 'transcoded' ) { + $name = wfBaseName( dirname( $path ) ); + $filename = $repo->getZonePath( $zone ) . substr( $path, strlen( "/" . $zone ) ); + // Check to see if the file exists + if ( !$repo->fileExists( $filename ) ) { + wfForbidden( 'img-auth-accessdenied', 'img-auth-nofile', $filename ); + return; + } + } else { + $name = wfBaseName( $path ); // file is a source file + $filename = $repo->getZonePath( 'public' ) . $path; + // Check to see if the file exists and is not deleted + $bits = explode( '!', $name, 2 ); + if ( substr( $path, 0, 9 ) === '/archive/' && count( $bits ) == 2 ) { + $file = $repo->newFromArchiveName( $bits[1], $name ); + } else { + $file = $repo->newFile( $name ); + } + if ( !$file->exists() || $file->isDeleted( File::DELETED_FILE ) ) { + wfForbidden( 'img-auth-accessdenied', 'img-auth-nofile', $filename ); + return; + } + } + + $headers = []; // extra HTTP headers to send + + if ( !$publicWiki ) { + // For private wikis, run extra auth checks and set cache control headers + $headers[] = 'Cache-Control: private'; + $headers[] = 'Vary: Cookie'; + + $title = Title::makeTitleSafe( NS_FILE, $name ); + if ( !$title instanceof Title ) { // files have valid titles + wfForbidden( 'img-auth-accessdenied', 'img-auth-badtitle', $name ); + return; + } + + // Run hook for extension authorization plugins + /** @var $result array */ + $result = null; + if ( !Hooks::run( 'ImgAuthBeforeStream', [ &$title, &$path, &$name, &$result ] ) ) { + wfForbidden( $result[0], $result[1], array_slice( $result, 2 ) ); + return; + } + + // Check user authorization for this title + // Checks Whitelist too + if ( !$title->userCan( 'read' ) ) { + wfForbidden( 'img-auth-accessdenied', 'img-auth-noread', $name ); + return; + } + } + + $options = []; // HTTP header options + if ( isset( $_SERVER['HTTP_RANGE'] ) ) { + $options['range'] = $_SERVER['HTTP_RANGE']; + } + if ( isset( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) { + $options['if-modified-since'] = $_SERVER['HTTP_IF_MODIFIED_SINCE']; + } + + if ( $request->getCheck( 'download' ) ) { + $headers[] = 'Content-Disposition: attachment'; + } + + // Stream the requested file + wfDebugLog( 'img_auth', "Streaming `" . $filename . "`." ); + $repo->streamFile( $filename, $headers, $options ); +} + +/** + * Issue a standard HTTP 403 Forbidden header ($msg1-a message index, not a message) and an + * error message ($msg2, also a message index), (both required) then end the script + * subsequent arguments to $msg2 will be passed as parameters only for replacing in $msg2 + * @param string $msg1 + * @param string $msg2 + */ +function wfForbidden( $msg1, $msg2 ) { + global $wgImgAuthDetails; + + $args = func_get_args(); + array_shift( $args ); + array_shift( $args ); + $args = ( isset( $args[0] ) && is_array( $args[0] ) ) ? $args[0] : $args; + + $msgHdr = wfMessage( $msg1 )->escaped(); + $detailMsgKey = $wgImgAuthDetails ? $msg2 : 'badaccess-group0'; + $detailMsg = wfMessage( $detailMsgKey, $args )->escaped(); + + wfDebugLog( 'img_auth', + "wfForbidden Hdr: " . wfMessage( $msg1 )->inLanguage( 'en' )->text() . " Msg: " . + wfMessage( $msg2, $args )->inLanguage( 'en' )->text() + ); + + HttpStatus::header( 403 ); + header( 'Cache-Control: no-cache' ); + header( 'Content-Type: text/html; charset=utf-8' ); + echo <<<ENDS +<!DOCTYPE html> +<html> +<head> +<meta charset="UTF-8" /> +<title>$msgHdr</title> +</head> +<body> +<h1>$msgHdr</h1> +<p>$detailMsg</p> +</body> +</html> +ENDS; +} |