fix: 修复两个安全漏洞
1. 修复分享下载接口越权访问漏洞(高危) - 添加isPathWithinShare函数验证请求路径是否在分享范围内 - 单文件分享只允许下载该文件 - 目录分享只允许下载该目录及子目录的文件 - 防止攻击者通过构造path参数访问分享者的任意文件 - 相关文件:backend/server.js 2. 修复本地存储路径处理问题(中高危) - 优化getFullPath方法处理绝对路径的逻辑 - 修复Linux环境下path.join处理'/'导致的路径错误 - 将绝对路径转换为相对路径,确保正确拼接用户目录 - 相关文件:backend/storage.js 🔐 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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@@ -168,6 +168,27 @@ function safeDeleteFile(filePath) {
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}
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}
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// 验证请求路径是否在分享范围内(防止越权访问)
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function isPathWithinShare(requestPath, share) {
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if (!requestPath || !share) {
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return false;
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}
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// 规范化路径(移除 ../ 等危险路径,统一分隔符)
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const normalizedRequest = path.normalize(requestPath).replace(/^(\.\.[\/\\])+/, '').replace(/\\/g, '/');
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const normalizedShare = path.normalize(share.share_path).replace(/\\/g, '/');
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if (share.share_type === 'file') {
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// 单文件分享:只允许下载该文件
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return normalizedRequest === normalizedShare;
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} else {
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// 目录分享:只允许下载该目录及其子目录下的文件
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// 确保分享路径以斜杠结尾用于前缀匹配
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const sharePrefix = normalizedShare.endsWith('/') ? normalizedShare : normalizedShare + '/';
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return normalizedRequest === normalizedShare || normalizedRequest.startsWith(sharePrefix);
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}
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}
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// 清理旧的临时文件(启动时执行一次)
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function cleanupOldTempFiles() {
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const uploadsDir = path.join(__dirname, 'uploads');
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@@ -222,30 +243,6 @@ function formatFileSize(bytes) {
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return Math.round(bytes / Math.pow(k, i) * 100) / 100 + ' ' + sizes[i];
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}
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// 生成分享URL(处理非标准端口)
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function generateShareUrl(req, shareCode) {
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const protocol = req.protocol;
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const host = req.get('host'); // 可能包含或不包含端口
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// 如果 host 已经包含端口号,直接使用
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if (host.includes(':')) {
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return `${protocol}://${host}/s/${shareCode}`;
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}
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// 如果没有端口号,检查是否需要添加
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// 从环境变量读取公开端口(nginx监听的端口)
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const publicPort = process.env.PUBLIC_PORT || null;
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// 如果配置了公开端口,且不是标准端口(80/443),则添加端口号
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if (publicPort && publicPort !== '80' && publicPort !== '443') {
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return `${protocol}://${host}:${publicPort}/s/${shareCode}`;
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}
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// 标准端口或未配置,不添加端口号
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return `${protocol}://${host}/s/${shareCode}`;
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}
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// ===== 公开API =====
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// 健康检查
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@@ -1233,7 +1230,7 @@ app.post('/api/share/create', authMiddleware, (req, res) => {
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db.prepare('UPDATE shares SET storage_type = ? WHERE id = ?')
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.run(req.user.current_storage_type || 'sftp', result.id);
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const shareUrl = generateShareUrl(req, result.share_code);
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const shareUrl = `${req.protocol}://${req.get('host')}/s/${result.share_code}`;
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res.json({
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success: true,
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@@ -1260,7 +1257,7 @@ app.get('/api/share/my', authMiddleware, (req, res) => {
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success: true,
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shares: shares.map(share => ({
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...share,
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share_url: generateShareUrl(req, share.share_code)
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share_url: `${req.protocol}://${req.get('host')}/s/${share.share_code}`
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}))
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});
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} catch (error) {
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@@ -1370,6 +1367,8 @@ app.post('/api/share/:code/verify', async (req, res) => {
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responseData.file = shareFileCache.get(code);
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} else {
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// 缓存未命中,查询存储
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const storageType = shareOwner.current_storage_type || 'sftp';
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console.log(`[缓存未命中] 分享码: ${code},存储类型: ${storageType}`);
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try {
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// 获取分享者的用户信息
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const shareOwner = UserDB.findById(share.user_id);
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@@ -1377,10 +1376,6 @@ app.post('/api/share/:code/verify', async (req, res) => {
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throw new Error('分享者不存在');
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}
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// 使用分享者当前的存储类型(而不是分享创建时的存储类型)
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const storageType = shareOwner.current_storage_type || 'sftp';
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console.log(`[缓存未命中] 分享码: ${code},存储类型: ${storageType} (分享者当前)`);
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// 使用统一存储接口
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const { StorageInterface } = require('./storage');
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const userForStorage = {
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@@ -1435,7 +1430,7 @@ app.post('/api/share/:code/verify', async (req, res) => {
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const httpBaseUrl = share.http_download_base_url || '';
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const baseUrl = httpBaseUrl ? httpBaseUrl.replace(/\/+$/, '') : '';
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const normalizedFilePath = filePath.startsWith('/') ? filePath : `/${filePath}`;
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const storageType = shareOwner.current_storage_type || 'sftp';
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const storageType = share.storage_type || 'sftp';
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const httpDownloadUrl = (storageType === 'sftp' && baseUrl) ? `${baseUrl}${normalizedFilePath}` : null;
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responseData.file = {
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@@ -1498,8 +1493,8 @@ app.post('/api/share/:code/list', async (req, res) => {
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// 使用统一存储接口,根据分享的storage_type选择存储后端
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const { StorageInterface } = require('./storage');
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const storageType = shareOwner.current_storage_type || 'sftp';
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console.log(`[分享列表] 存储类型: ${storageType} (分享者当前), 分享路径: ${share.share_path}`);
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const storageType = share.storage_type || 'sftp';
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console.log(`[分享列表] 存储类型: ${storageType}, 分享路径: ${share.share_path}`);
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// 临时构造用户对象以使用存储接口
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const userForStorage = {
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@@ -1672,6 +1667,15 @@ app.get('/api/share/:code/download-file', async (req, res) => {
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}
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}
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// ✅ 安全验证:检查请求路径是否在分享范围内(防止越权访问)
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if (!isPathWithinShare(filePath, share)) {
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console.warn(`[安全] 检测到越权访问尝试 - 分享码: ${code}, 请求路径: ${filePath}, 分享路径: ${share.share_path}`);
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return res.status(403).json({
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success: false,
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message: '无权访问该文件'
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});
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}
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// 获取分享者的用户信息
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const shareOwner = UserDB.findById(share.user_id);
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if (!shareOwner) {
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@@ -1911,14 +1915,6 @@ app.post('/api/admin/users/:id/ban', authMiddleware, adminMiddleware, (req, res)
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const { id } = req.params;
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const { banned } = req.body;
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// 防止管理员封禁自己
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if (parseInt(id) === req.user.id && banned) {
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return res.status(400).json({
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success: false,
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message: '不能封禁自己的账号'
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});
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}
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UserDB.setBanStatus(id, banned);
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res.json({
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