fix: incomplete regex for stripped assets #614

Sainan · 2024-12-22T17:09:01-08:00

Sainan commented

2024-12-22 17:09:01 -08:00

No description provided.

coderabbitai[bot] commented

2024-12-22 17:09:07 -08:00

(Migrated from github.com)

Walkthrough

The pull request introduces a modification to the routing logic in the src/routes/cache.ts file, specifically focusing on the route handling mechanism for cache-related requests. The primary change involves updating the route's regex pattern for matching file paths.

The original route handler used a more generic regex pattern .bk2! for matching cache files. The new implementation replaces this with a more specific regex pattern ^\/0\/Lotus\/.+!$, which enforces a more strict matching criteria. This new pattern requires routes to:

Start with /0/Lotus/
Include additional characters after the Lotus directory
End with an exclamation mark

The core functionality of the route remains consistent, including:

Validating the request
Serving the appropriate cache file
Maintaining existing error handling mechanisms (returning a 404 status for non-existent files)

The change suggests a more targeted approach to routing, potentially aligning with a specific file structure or naming convention for cache files within the application's ecosystem.

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## Walkthrough The pull request introduces a modification to the routing logic in the `src/routes/cache.ts` file, specifically focusing on the route handling mechanism for cache-related requests. The primary change involves updating the route's regex pattern for matching file paths. The original route handler used a more generic regex pattern `.bk2!` for matching cache files. The new implementation replaces this with a more specific regex pattern `^\/0\/Lotus\/.+!$`, which enforces a more strict matching criteria. This new pattern requires routes to: - Start with `/0/Lotus/` - Include additional characters after the Lotus directory - End with an exclamation mark The core functionality of the route remains consistent, including: - Validating the request - Serving the appropriate cache file - Maintaining existing error handling mechanisms (returning a 404 status for non-existent files) The change suggests a more targeted approach to routing, potentially aligning with a specific file structure or naming convention for cache files within the application's ecosystem.      --- Thank you for using CodeRabbit. We offer it for free to the OSS community and would appreciate your support in helping us grow. If you find it useful, would you consider giving us a shout-out on your favorite social media? <details> <summary>❤️ Share</summary> - [X](https://twitter.com/intent/tweet?text=I%20just%20used%20%40coderabbitai%20for%20my%20code%20review%2C%20and%20it%27s%20fantastic%21%20It%27s%20free%20for%20OSS%20and%20offers%20a%20free%20trial%20for%20the%20proprietary%20code.%20Check%20it%20out%3A&url=https%3A//coderabbit.ai) - [Mastodon](https://mastodon.social/share?text=I%20just%20used%20%40coderabbitai%20for%20my%20code%20review%2C%20and%20it%27s%20fantastic%21%20It%27s%20free%20for%20OSS%20and%20offers%20a%20free%20trial%20for%20the%20proprietary%20code.%20Check%20it%20out%3A%20https%3A%2F%2Fcoderabbit.ai) - [Reddit](https://www.reddit.com/submit?title=Great%20tool%20for%20code%20review%20-%20CodeRabbit&text=I%20just%20used%20CodeRabbit%20for%20my%20code%20review%2C%20and%20it%27s%20fantastic%21%20It%27s%20free%20for%20OSS%20and%20offers%20a%20free%20trial%20for%20proprietary%20code.%20Check%20it%20out%3A%20https%3A//coderabbit.ai) - [LinkedIn](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fcoderabbit.ai&mini=true&title=Great%20tool%20for%20code%20review%20-%20CodeRabbit&summary=I%20just%20used%20CodeRabbit%20for%20my%20code%20review%2C%20and%20it%27s%20fantastic%21%20It%27s%20free%20for%20OSS%20and%20offers%20a%20free%20trial%20for%20proprietary%20code) </details> <details> <summary>🪧 Tips</summary> ### Chat There are 3 ways to chat with [CodeRabbit](https://coderabbit.ai): - Review comments: Directly reply to a review comment made by CodeRabbit. 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coderabbitai[bot] (Migrated from github.com) reviewed 2024-12-22 17:10:43 -08:00

coderabbitai[bot] (Migrated from github.com) left a comment

Actionable comments posted: 0

🔭 Outside diff range comments (1)

src/routes/cache.ts (1)
Based on the results, I can now generate the final response as we have confirmed:

The route pattern /^\/0\/Lotus\/.+!.+$/ allows any characters after /0/Lotus/

The path is used directly without any sanitization

No existing path normalization or validation is present

Path traversal vulnerability confirmed - immediate action required

The code is vulnerable to path traversal attacks as it:

Uses unsanitized req.path directly to construct file paths

Lacks path normalization to handle ../ sequences

Has no validation to ensure the path stays within intended directory

The suggested fix in the review comment is correct and necessary:

Normalizing the path using path.normalize()

Stripping ../ sequences

Validating the normalized path starts with /0/Lotus/
🔗 Analysis chain

Line range hint 15-28: Add path traversal protection.

The current implementation directly uses the request path to construct the file path without sanitization.

Consider adding path normalization and validation:
 cacheRouter.get(/^\/0\/Lotus\/.+!.+$/, async (req, res) => {
     try {
+        // Normalize and validate path
+        const normalizedPath = path.normalize(req.path).replace(/^(\.\.[\/\\])+/, '');
+        if (!normalizedPath.startsWith('/0/Lotus/')) {
+            return res.status(403).end();
+        }
+
-        const dir = req.path.substr(0, req.path.lastIndexOf("/"));
-        const file = req.path.substr(dir.length + 1);
+        const dir = normalizedPath.substr(0, normalizedPath.lastIndexOf("/"));
+        const file = normalizedPath.substr(dir.length + 1);
         const filePath = `static/data${dir}/${file}`;
Let's verify the potential for path traversal:

Let me gather more context about the route pattern and any existing path validations.
🏁 Scripts executed

The following scripts were executed for the analysis:

Script:
#!/bin/bash
# Check for potential path traversal vulnerabilities in route handlers
rg -l "req\.path" | xargs ast-grep --pattern 'req.path' -A 3
Length of output: 388

Script:
#!/bin/bash
# Check the route pattern and surrounding context
rg -A 10 "cacheRouter\.get" src/routes/cache.ts

# Look for any existing path validation or sanitization
rg -i "normalize|sanitize|validate|clean" src/routes/cache.ts
Length of output: 928

🧹 Nitpick comments (1)

src/routes/cache.ts (1)
15-15: Consider tightening the regex pattern further.

While the new pattern /^\/0\/Lotus\/.+!.+$/ is more specific than the previous one, it might still be too permissive:

.+!.+ matches any character after the exclamation mark

No validation for specific file extensions or patterns

Consider using a more specific pattern like:
-cacheRouter.get(/^\/0\/Lotus\/.+!.+$/, async (req, res) => {
+cacheRouter.get(/^\/0\/Lotus\/[^/]+!(?:stripped|original)$/, async (req, res) => {
This would:

Prevent directory traversal in the middle segment

Only allow specific suffixes after the exclamation mark

📜 Review details

Configuration used: .coderabbit.yaml
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between d5c829e4fe and b7cd3e0494.

📒 Files selected for processing (1)

src/routes/cache.ts (1 hunks)

**Actionable comments posted: 0** <details> <summary>🔭 Outside diff range comments (1)</summary><blockquote> <details> <summary>src/routes/cache.ts (1)</summary><blockquote> Based on the results, I can now generate the final response as we have confirmed: 1. The route pattern `/^\/0\/Lotus\/.+!.+$/` allows any characters after `/0/Lotus/` 2. The path is used directly without any sanitization 3. No existing path normalization or validation is present **Path traversal vulnerability confirmed - immediate action required** The code is vulnerable to path traversal attacks as it: - Uses unsanitized `req.path` directly to construct file paths - Lacks path normalization to handle `../` sequences - Has no validation to ensure the path stays within intended directory The suggested fix in the review comment is correct and necessary: - Normalizing the path using `path.normalize()` - Stripping `../` sequences - Validating the normalized path starts with `/0/Lotus/` <details> <summary>🔗 Analysis chain</summary> Line range hint `15-28`: **Add path traversal protection.** The current implementation directly uses the request path to construct the file path without sanitization. Consider adding path normalization and validation: ```diff cacheRouter.get(/^\/0\/Lotus\/.+!.+$/, async (req, res) => { try { + // Normalize and validate path + const normalizedPath = path.normalize(req.path).replace(/^(\.\.[\/\\])+/, ''); + if (!normalizedPath.startsWith('/0/Lotus/')) { + return res.status(403).end(); + } + - const dir = req.path.substr(0, req.path.lastIndexOf("/")); - const file = req.path.substr(dir.length + 1); + const dir = normalizedPath.substr(0, normalizedPath.lastIndexOf("/")); + const file = normalizedPath.substr(dir.length + 1); const filePath = `static/data${dir}/${file}`; ``` Let's verify the potential for path traversal: --- Let me gather more context about the route pattern and any existing path validations. </details> <details> <summary>🏁 Scripts executed</summary> The following scripts were executed for the analysis: Script: ```shell #!/bin/bash # Check for potential path traversal vulnerabilities in route handlers rg -l "req\.path" | xargs ast-grep --pattern 'req.path' -A 3 ``` Length of output: 388 --- Script: ```shell #!/bin/bash # Check the route pattern and surrounding context rg -A 10 "cacheRouter\.get" src/routes/cache.ts # Look for any existing path validation or sanitization rg -i "normalize|sanitize|validate|clean" src/routes/cache.ts ``` Length of output: 928 </details> </blockquote></details> </blockquote></details> <details> <summary>🧹 Nitpick comments (1)</summary><blockquote> <details> <summary>src/routes/cache.ts (1)</summary><blockquote> `15-15`: **Consider tightening the regex pattern further.** While the new pattern `/^\/0\/Lotus\/.+!.+$/` is more specific than the previous one, it might still be too permissive: 1. `.+!.+` matches any character after the exclamation mark 2. No validation for specific file extensions or patterns Consider using a more specific pattern like: ```diff -cacheRouter.get(/^\/0\/Lotus\/.+!.+$/, async (req, res) => { +cacheRouter.get(/^\/0\/Lotus\/[^/]+!(?:stripped|original)$/, async (req, res) => { ``` This would: - Prevent directory traversal in the middle segment - Only allow specific suffixes after the exclamation mark </blockquote></details> </blockquote></details> <details> <summary>📜 Review details</summary> **Configuration used: .coderabbit.yaml** **Review profile: CHILL** **Plan: Pro** <details> <summary>📥 Commits</summary> Reviewing files that changed from the base of the PR and between d5c829e4fe8118b7b85b1416105935110aa6dc8f and b7cd3e04944c8b2b5e9a51e12fb80d66fa1718b5. </details> <details> <summary>📒 Files selected for processing (1)</summary> * `src/routes/cache.ts` (1 hunks) </details> </details>

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Reference: OpenWF/SpaceNinjaServer#614