DRAFT: Gitlab serve whitelist ips

[paolomainardi]

User description

refs #1166

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PR Type

Enhancement

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Description

• Implemented IP whitelisting functionality for the GitLab webhook server
• Added IPWhitelistMiddleware to check client IP against a whitelist
• Created a custom exception handler for HTTPException to return JSON responses
• Modified FastAPI app initialization to include the new middleware
• Added server_whitelisted_ips configuration option in configuration.toml
• Improved error handling and security for the webhook server

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Changes walkthrough 📝

	Relevant files
Enhancement	gitlab_webhook.py Implement IP whitelisting for GitLab webhook server            pr_agent/servers/gitlab_webhook.py Imported HTTPException and BaseHTTPMiddleware Implemented IPWhitelistMiddleware to restrict access based on client IP Added custom exception handler for HTTPException Modified FastAPI app initialization to include new middleware +28/-4
Configuration changes	configuration.toml Add whitelist IP configuration                                                      pr_agent/settings/configuration.toml Added server_whitelisted_ips configuration option +2/-0

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PR Reviewer Guide 🔍

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🏅 Score: 85

🧪 No relevant tests

🔒 Security concerns IP Whitelist Implementation: The current implementation of IP whitelisting in the IPWhitelistMiddleware class may have potential security issues. The code only handles IPv4 addresses with ports, but it doesn't account for IPv6 addresses or other possible formats. This could potentially allow unauthorized access if an attacker uses a different IP format. Additionally, the whitelist check is only performed if the whitelisted_ips list is not empty, which might not be the intended behavior if the list is accidentally left empty.

🔀 Multiple PR themes Sub-PR theme: Implement IP whitelisting for GitLab webhook server Relevant files: pr_agent/servers/gitlab_webhook.py Sub-PR theme: Update configuration settings and add server_whitelisted_ips option Relevant files: pr_agent/settings/configuration.toml

⚡ Key issues to review Security Concern The IP whitelisting implementation might not handle all possible IP formats, potentially allowing unauthorized access. Error Handling The custom exception handler for HTTPException might not cover all possible error scenarios.

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PR Code Suggestions ✨

Category	Suggestion	Score
Performance	Optimize IP whitelist checking for better performance The IP whitelist check is performed on every request, which could impact performance for high-traffic applications. Consider caching the whitelist or using a more efficient data structure for lookups if the list of whitelisted IPs is large. pr_agent/servers/gitlab_webhook.py [201-214] class IPWhitelistMiddleware(BaseHTTPMiddleware): + def __init__(self, app): + super().__init__(app) + self.whitelisted_ips = set(get_settings().get("CONFIG.WHITELISTED_IPS", [])) + async def dispatch(self, request: Request, call_next): - whitelisted_ips = get_settings().get("CONFIG.WHITELISTED_IPS", []) - client_ip = request.client.host + client_ip = request.client.host.split(":")[0] # Strip port if present + if self.whitelisted_ips and client_ip not in self.whitelisted_ips: + logging.warning(f"Client IP {client_ip} not in whitelisted IPs") + raise HTTPException(status_code=403, detail="Forbidden") + return await call_next(request) - # strip port from client_ip if present. - if ":" in client_ip: - client_ip = client_ip.split(":")[0] - - if client_ip not in whitelisted_ips and whitelisted_ips != []: - print (f"Client IP {client_ip} not in whitelisted IPs {whitelisted_ips}") - raise HTTPException(status_code=403, detail="Forbidden") - response = await call_next(request) - return response - Apply this suggestion Suggestion importance[1-10]: 9 Why: This suggestion significantly improves performance and efficiency, especially for high-traffic applications.	9
Possible issue	Improve IP address handling to support both IPv4 and IPv6 addresses correctly The current implementation doesn't handle IPv6 addresses properly. The string splitting method used to remove the port might not work correctly for IPv6 addresses. Consider using the ipaddress module for more robust IP address handling. pr_agent/servers/gitlab_webhook.py [204-208] -client_ip = request.client.host +from ipaddress import ip_address -# strip port from client_ip if present. -if ":" in client_ip: - client_ip = client_ip.split(":")[0] +try: + client_ip = ip_address(request.client.host.split('%')[0]) # Remove scope if present +except ValueError: + logging.error(f"Invalid IP address: {request.client.host}") + raise HTTPException(status_code=400, detail="Invalid IP address") Apply this suggestion Suggestion importance[1-10]: 9 Why: Proper handling of both IPv4 and IPv6 addresses is crucial for network compatibility and security.	9
Best practice	Replace print statement with proper logging for IP whitelist violations The print statement used for logging the IP whitelist violation is not suitable for production environments. Consider using a proper logging mechanism that allows for better control over log levels and output destinations. pr_agent/servers/gitlab_webhook.py [210-212] if client_ip not in whitelisted_ips and whitelisted_ips != []: - print (f"Client IP {client_ip} not in whitelisted IPs {whitelisted_ips}") + logging.warning(f"Client IP {client_ip} not in whitelisted IPs {whitelisted_ips}") raise HTTPException(status_code=403, detail="Forbidden") Apply this suggestion Suggestion importance[1-10]: 8 Why: Proper logging is a significant improvement for production environments, enhancing debugging and monitoring capabilities.	8
Enhancement	Use a custom exception for IP whitelist violations instead of a general HTTPException Consider using a more specific exception type instead of a general HTTPException for IP whitelist violations. This would provide clearer error handling and make it easier to distinguish between different types of errors. pr_agent/servers/gitlab_webhook.py [210-212] if client_ip not in whitelisted_ips and whitelisted_ips != []: - print (f"Client IP {client_ip} not in whitelisted IPs {whitelisted_ips}") - raise HTTPException(status_code=403, detail="Forbidden") + print(f"Client IP {client_ip} not in whitelisted IPs {whitelisted_ips}") + raise IPWhitelistViolation(status_code=403, detail="IP not in whitelist") Apply this suggestion Suggestion importance[1-10]: 7 Why: Using a custom exception improves error handling specificity and clarity, but it's not a critical change.	7

[paolomainardi]

/describe

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PR Description updated to latest commit (91bc229)

• Copy walkthrough table to "Files Changed" Tab

[mrT23]

closing, as this is ability should not be a part of pr-agent