Validate file path in serve_docs function to enhance security #52
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Zingzy
added
backend
1 task
Reviewer's Guide by SourceryThe PR implements a security enhancement for the serve_docs function by adding input validation for file paths. It uses regex pattern matching to ensure only alphanumeric characters, underscores, and hyphens are allowed in the file path parameter. Sequence diagram for serve_docs function with file path validationsequenceDiagram
participant User
participant Server
User->>Server: Request serve_docs(file_path)
Server->>Server: Validate file_path with regex
alt Valid file_path
Server->>Server: Check if file exists
alt File exists
Server->>User: Render requested document
else File not found
Server->>User: Render error.html
end
else Invalid file_path
Server->>User: Render error.html
end
File-Level Changes
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Hey @Zingzy - I've reviewed your changes - here's some feedback:
Overall Comments:
- The file path validation regex is too restrictive and doesn't support subdirectories. Consider using a more robust path validation approach that can safely handle nested paths while preventing traversal attacks.
- Catching all exceptions generically can mask security issues. Consider catching and handling specific exceptions (ValueError, FileNotFoundError) separately and logging them appropriately.
Here's what I looked at during the review
- 🟡 General issues: 1 issue found
- 🟡 Security: 1 issue found
- 🟢 Testing: all looks good
- 🟢 Complexity: all looks good
- 🟢 Documentation: all looks good
Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.
blueprints/docs.py
Outdated
| @@ -16,10 +17,13 @@ def serve_docs_index(): | |||
| @limiter.exempt | |||
| def serve_docs(file_path): | |||
| try: | |||
| # Validate file_path | |||
| if not re.match(r'^[a-zA-Z0-9_-]+$', file_path): | |||
| raise ValueError("Invalid file path") | |||
| if not os.path.exists(f"templates/docs/{file_path}.html"): | |||
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🚨 issue (security): Use os.path.join() instead of f-string concatenation for file paths to prevent path traversal vulnerabilities
String concatenation with file paths can be dangerous. Use os.path.join('templates', 'docs', f'{file_path}.html') for safer path handling.
| if not os.path.exists(f"templates/docs/{file_path}.html"): | ||
| raise FileNotFoundError | ||
| return render_template(f"docs/{file_path}.html", host_url=request.host_url) | ||
| except: | ||
| except Exception: |
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suggestion (bug_risk): Consider catching specific exceptions instead of generic Exception
Catching specific exceptions (ValueError, FileNotFoundError) would make error handling more predictable and prevent masking of unexpected errors.
except (FileNotFoundError, TemplateNotFound):![github-advanced-security[bot]](https://avatars.githubusercontent.com/in/57789?s=60&v=4){kind=small}
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This PR addresses Issue #47
Summary by Sourcery
Bug Fixes: