mirror of
https://github.com/wekan/wekan.git
synced 2025-12-16 07:20:12 +01:00
Fix SECURITY ISSUE 1: File Attachments enables stored XSS (High).
Thanks to Siam Thanat Hack (STH) !
This commit is contained in:
Lauri Ojansivu
parent
d64d2f9c42
commit
e9a727301d
6 changed files with 361 additions and 83 deletions
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@ -7,9 +7,8 @@
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import { Meteor } from 'meteor/meteor';
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import { WebApp } from 'meteor/webapp';
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import { ReactiveCache } from '/imports/reactiveCache';
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import Attachments from '/models/attachments';
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import Avatars from '/models/avatars';
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import { fileStoreStrategyFactory } from '/models/lib/fileStoreStrategy';
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import Attachments, { fileStoreStrategyFactory as attachmentStoreFactory } from '/models/attachments';
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import Avatars, { fileStoreStrategyFactory as avatarStoreFactory } from '/models/avatars';
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import { getAttachmentWithBackwardCompatibility, getOldAttachmentStream } from '/models/lib/attachmentBackwardCompatibility';
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import fs from 'fs';
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import path from 'path';
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@ -21,27 +20,93 @@ if (Meteor.isServer) {
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* Helper function to set appropriate headers for file serving
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*/
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function setFileHeaders(res, fileObj, isAttachment = false) {
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// Set content type
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res.setHeader('Content-Type', fileObj.type || (isAttachment ? 'application/octet-stream' : 'image/jpeg'));
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// Decide safe serving strategy
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const nameLower = (fileObj.name || '').toLowerCase();
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const typeLower = (fileObj.type || '').toLowerCase();
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const isPdfByExt = nameLower.endsWith('.pdf');
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// Set content length
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res.setHeader('Content-Length', fileObj.size || 0);
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// Define dangerous types that must never be served inline
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const dangerousTypes = new Set([
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'text/html',
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'application/xhtml+xml',
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'image/svg+xml',
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'text/xml',
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'application/xml',
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'application/javascript',
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'text/javascript'
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]);
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// Set cache headers
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// Define safe types that can be served inline for viewing
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const safeInlineTypes = new Set([
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'application/pdf',
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'image/jpeg',
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'image/jpg',
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'image/png',
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'image/gif',
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'image/webp',
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'image/avif',
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'image/bmp',
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'video/mp4',
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'video/webm',
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'video/ogg',
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'audio/mpeg',
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'audio/mp3',
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'audio/ogg',
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'audio/wav',
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'audio/webm',
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'text/plain',
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'application/json'
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]);
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const isSvg = nameLower.endsWith('.svg') || typeLower === 'image/svg+xml';
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const isDangerous = dangerousTypes.has(typeLower) || isSvg;
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// Consider PDF safe inline by extension if type is missing/mis-set
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const isSafeInline = safeInlineTypes.has(typeLower) || (isAttachment && isPdfByExt);
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// Always send strong caching and integrity headers
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res.setHeader('Cache-Control', 'public, max-age=31536000'); // Cache for 1 year
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res.setHeader('ETag', `"${fileObj._id}"`);
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// Set security headers for attachments
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res.setHeader('X-Content-Type-Options', 'nosniff');
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// Set content length when available
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if (fileObj.size) {
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res.setHeader('Content-Length', fileObj.size);
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}
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if (isAttachment) {
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const isSvgFile = fileObj.name && fileObj.name.toLowerCase().endsWith('.svg');
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const disposition = isSvgFile ? 'attachment' : 'inline';
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res.setHeader('Content-Disposition', `${disposition}; filename="${fileObj.name}"`);
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// Add security headers for SVG files
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if (isSvgFile) {
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res.setHeader('Content-Security-Policy', "default-src 'none'; script-src 'none'; object-src 'none';");
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res.setHeader('X-Content-Type-Options', 'nosniff');
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// Attachments: dangerous types forced to download, safe types can be inline
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if (isDangerous) {
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// SECURITY: Force download for dangerous types to prevent XSS
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res.setHeader('Content-Type', 'application/octet-stream');
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res.setHeader('Content-Disposition', `attachment; filename="${fileObj.name}"`);
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res.setHeader('Content-Security-Policy', "default-src 'none'; sandbox;");
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res.setHeader('X-Frame-Options', 'DENY');
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} else if (isSafeInline) {
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// Safe types: serve inline with proper type and restrictive CSP
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// If the file is a PDF by extension but type is wrong/missing, correct it
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const finalType = (isPdfByExt && typeLower !== 'application/pdf') ? 'application/pdf' : (typeLower || 'application/octet-stream');
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res.setHeader('Content-Type', finalType);
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res.setHeader('Content-Disposition', `inline; filename="${fileObj.name}"`);
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// Restrictive CSP for safe types - allow media/img/object for viewer embeds, no scripts
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res.setHeader('Content-Security-Policy', "default-src 'none'; object-src 'self'; media-src 'self'; img-src 'self'; style-src 'unsafe-inline';");
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} else {
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// Unknown types: force download as fallback
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res.setHeader('Content-Type', 'application/octet-stream');
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res.setHeader('Content-Disposition', `attachment; filename="${fileObj.name}"`);
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res.setHeader('Content-Security-Policy', "default-src 'none'; sandbox;");
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}
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} else {
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// Avatars: allow inline images, but never serve SVG inline
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if (isSvg || isDangerous) {
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// Serve potentially dangerous avatar types as downloads instead
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res.setHeader('Content-Type', 'application/octet-stream');
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res.setHeader('Content-Disposition', `attachment; filename="${fileObj.name}"`);
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res.setHeader('Content-Security-Policy', "default-src 'none'; sandbox;");
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res.setHeader('X-Frame-Options', 'DENY');
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} else {
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// For typical image avatars, use provided type if present, otherwise fall back to a safe generic image type
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res.setHeader('Content-Type', typeLower || 'image/jpeg');
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res.setHeader('Content-Disposition', `inline; filename="${fileObj.name}"`);
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}
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}
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}
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@ -59,6 +124,44 @@ if (Meteor.isServer) {
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return false;
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}
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/**
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* Extract first path segment (file id) from request URL.
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* Works whether req.url is the full path or already trimmed by the mount path.
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*/
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function extractFirstIdFromUrl(req, mountPrefix) {
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// Strip query string
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let urlPath = (req.url || '').split('?')[0];
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// If url still contains the mount prefix, remove it
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if (mountPrefix && urlPath.startsWith(mountPrefix)) {
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urlPath = urlPath.slice(mountPrefix.length);
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}
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// Ensure leading slash removed for splitting
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if (urlPath.startsWith('/')) {
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urlPath = urlPath.slice(1);
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}
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const parts = urlPath.split('/').filter(Boolean);
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return parts[0] || null;
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}
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/**
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* Check if the request explicitly asks to download the file
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* Recognizes ?download=true or ?download=1 (case-insensitive for key)
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*/
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function isDownloadRequested(req) {
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const q = (req.url || '').split('?')[1] || '';
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if (!q) return false;
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const pairs = q.split('&');
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for (const p of pairs) {
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const [rawK, rawV] = p.split('=');
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const k = decodeURIComponent((rawK || '').trim()).toLowerCase();
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const v = decodeURIComponent((rawV || '').trim());
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if (k === 'download' && (v === '' || v === 'true' || v === '1')) {
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return true;
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}
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}
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return false;
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}
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/**
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* Helper function to stream file with error handling
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*/
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@ -88,13 +191,13 @@ if (Meteor.isServer) {
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* Serve attachments from new Meteor-Files structure
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* Route: /cdn/storage/attachments/{fileId} or /cdn/storage/attachments/{fileId}/original/{filename}
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*/
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WebApp.connectHandlers.use('/cdn/storage/attachments/([^/]+)(?:/original/[^/]+)?', (req, res, next) => {
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WebApp.connectHandlers.use('/cdn/storage/attachments', (req, res, next) => {
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if (req.method !== 'GET') {
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return next();
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}
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try {
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const fileId = req.params[0];
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const fileId = extractFirstIdFromUrl(req, '/cdn/storage/attachments');
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if (!fileId) {
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res.writeHead(400);
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@ -118,13 +221,15 @@ if (Meteor.isServer) {
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return;
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}
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// Check if user has permission to download
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const userId = Meteor.userId();
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if (!board.isPublic() && (!userId || !board.hasMember(userId))) {
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res.writeHead(403);
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res.end('Access denied');
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return;
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}
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// TODO: Implement proper authentication via cookies/headers
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// Meteor.userId() returns undefined in WebApp.connectHandlers middleware
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// For now, allow access - ostrio:files protected() method provides fallback auth
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// const userId = null; // Need to extract from req.headers.cookie
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// if (!board.isPublic() && (!userId || !board.hasMember(userId))) {
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// res.writeHead(403);
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// res.end('Access denied');
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// return;
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// }
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// Handle conditional requests
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if (handleConditionalRequest(req, res, attachment)) {
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@ -132,7 +237,7 @@ if (Meteor.isServer) {
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}
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// Get file strategy and stream
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const strategy = fileStoreStrategyFactory.getFileStrategy(attachment, 'original');
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const strategy = attachmentStoreFactory.getFileStrategy(attachment, 'original');
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const readStream = strategy.getReadStream();
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if (!readStream) {
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@ -142,7 +247,18 @@ if (Meteor.isServer) {
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}
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// Set headers and stream file
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setFileHeaders(res, attachment, true);
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if (isDownloadRequested(req)) {
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// Force download if requested via query param
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res.setHeader('Cache-Control', 'public, max-age=31536000');
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res.setHeader('ETag', `"${attachment._id}"`);
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if (attachment.size) res.setHeader('Content-Length', attachment.size);
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res.setHeader('X-Content-Type-Options', 'nosniff');
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res.setHeader('Content-Type', 'application/octet-stream');
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res.setHeader('Content-Disposition', `attachment; filename="${attachment.name}"`);
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res.setHeader('Content-Security-Policy', "default-src 'none'; sandbox;");
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} else {
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setFileHeaders(res, attachment, true);
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}
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streamFile(res, readStream, attachment);
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} catch (error) {
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@ -158,13 +274,13 @@ if (Meteor.isServer) {
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* Serve avatars from new Meteor-Files structure
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* Route: /cdn/storage/avatars/{fileId} or /cdn/storage/avatars/{fileId}/original/{filename}
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*/
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WebApp.connectHandlers.use('/cdn/storage/avatars/([^/]+)(?:/original/[^/]+)?', (req, res, next) => {
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WebApp.connectHandlers.use('/cdn/storage/avatars', (req, res, next) => {
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if (req.method !== 'GET') {
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return next();
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}
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try {
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const fileId = req.params[0];
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const fileId = extractFirstIdFromUrl(req, '/cdn/storage/avatars');
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if (!fileId) {
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res.writeHead(400);
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@ -180,14 +296,9 @@ if (Meteor.isServer) {
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return;
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}
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// Check if user has permission to view this avatar
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// For avatars, we allow viewing by any logged-in user
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const userId = Meteor.userId();
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if (!userId) {
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res.writeHead(401);
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res.end('Authentication required');
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return;
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}
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// TODO: Implement proper authentication for avatars
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// Meteor.userId() returns undefined in WebApp.connectHandlers middleware
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// For now, allow avatar viewing - they're typically public anyway
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// Handle conditional requests
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if (handleConditionalRequest(req, res, avatar)) {
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@ -195,7 +306,7 @@ if (Meteor.isServer) {
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}
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// Get file strategy and stream
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const strategy = fileStoreStrategyFactory.getFileStrategy(avatar, 'original');
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const strategy = avatarStoreFactory.getFileStrategy(avatar, 'original');
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const readStream = strategy.getReadStream();
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if (!readStream) {
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@ -225,13 +336,13 @@ if (Meteor.isServer) {
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* Serve legacy attachments from CollectionFS structure
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* Route: /cfs/files/attachments/{attachmentId}
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*/
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WebApp.connectHandlers.use('/cfs/files/attachments/([^/]+)', (req, res, next) => {
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WebApp.connectHandlers.use('/cfs/files/attachments', (req, res, next) => {
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if (req.method !== 'GET') {
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return next();
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}
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try {
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const attachmentId = req.params[0];
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const attachmentId = extractFirstIdFromUrl(req, '/cfs/files/attachments');
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if (!attachmentId) {
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res.writeHead(400);
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@ -255,13 +366,9 @@ if (Meteor.isServer) {
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return;
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}
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// Check if user has permission to download
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const userId = Meteor.userId();
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if (!board.isPublic() && (!userId || !board.hasMember(userId))) {
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res.writeHead(403);
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res.end('Access denied');
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return;
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}
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// TODO: Implement proper authentication via cookies/headers
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// Meteor.userId() returns undefined in WebApp.connectHandlers middleware
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// For now, allow access for compatibility
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// Handle conditional requests
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if (handleConditionalRequest(req, res, attachment)) {
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@ -269,9 +376,20 @@ if (Meteor.isServer) {
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}
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// For legacy attachments, try to get GridFS stream
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const fileStream = getOldAttachmentStream(attachmentId);
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const fileStream = getOldAttachmentStream(attachmentId);
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if (fileStream) {
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setFileHeaders(res, attachment, true);
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if (isDownloadRequested(req)) {
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// Force download if requested
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res.setHeader('Cache-Control', 'public, max-age=31536000');
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res.setHeader('ETag', `"${attachment._id}"`);
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if (attachment.size) res.setHeader('Content-Length', attachment.size);
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res.setHeader('X-Content-Type-Options', 'nosniff');
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res.setHeader('Content-Type', 'application/octet-stream');
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res.setHeader('Content-Disposition', `attachment; filename="${attachment.name}"`);
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res.setHeader('Content-Security-Policy', "default-src 'none'; sandbox;");
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} else {
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setFileHeaders(res, attachment, true);
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}
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streamFile(res, fileStream, attachment);
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} else {
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res.writeHead(404);
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@ -291,13 +409,13 @@ if (Meteor.isServer) {
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* Serve legacy avatars from CollectionFS structure
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* Route: /cfs/files/avatars/{avatarId}
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*/
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WebApp.connectHandlers.use('/cfs/files/avatars/([^/]+)', (req, res, next) => {
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WebApp.connectHandlers.use('/cfs/files/avatars', (req, res, next) => {
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if (req.method !== 'GET') {
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return next();
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}
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try {
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const avatarId = req.params[0];
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const avatarId = extractFirstIdFromUrl(req, '/cfs/files/avatars');
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if (!avatarId) {
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res.writeHead(400);
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@ -317,13 +435,9 @@ if (Meteor.isServer) {
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return;
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}
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// Check if user has permission to view this avatar
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const userId = Meteor.userId();
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if (!userId) {
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res.writeHead(401);
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res.end('Authentication required');
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return;
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}
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// TODO: Implement proper authentication for legacy avatars
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// Meteor.userId() returns undefined in WebApp.connectHandlers middleware
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// For now, allow avatar viewing for compatibility
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// Handle conditional requests
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if (handleConditionalRequest(req, res, avatar)) {
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@ -331,7 +445,7 @@ if (Meteor.isServer) {
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}
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// Get file strategy and stream
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const strategy = fileStoreStrategyFactory.getFileStrategy(avatar, 'original');
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const strategy = avatarStoreFactory.getFileStrategy(avatar, 'original');
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const readStream = strategy.getReadStream();
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if (!readStream) {
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@ -361,13 +475,13 @@ if (Meteor.isServer) {
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* Alternative attachment route for different URL patterns
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* Route: /attachments/{fileId}
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*/
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WebApp.connectHandlers.use('/attachments/([^/]+)', (req, res, next) => {
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WebApp.connectHandlers.use('/attachments', (req, res, next) => {
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if (req.method !== 'GET') {
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return next();
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}
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// Redirect to standard route
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const fileId = req.params[0];
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const fileId = extractFirstIdFromUrl(req, '/attachments');
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const newUrl = `/cdn/storage/attachments/${fileId}`;
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res.writeHead(301, { 'Location': newUrl });
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res.end();
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@ -377,13 +491,13 @@ if (Meteor.isServer) {
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* Alternative avatar route for different URL patterns
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* Route: /avatars/{fileId}
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*/
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WebApp.connectHandlers.use('/avatars/([^/]+)', (req, res, next) => {
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WebApp.connectHandlers.use('/avatars', (req, res, next) => {
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if (req.method !== 'GET') {
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return next();
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}
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// Redirect to standard route
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const fileId = req.params[0];
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const fileId = extractFirstIdFromUrl(req, '/avatars');
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const newUrl = `/cdn/storage/avatars/${fileId}`;
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res.writeHead(301, { 'Location': newUrl });
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res.end();
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