[dsyme]

This PR is for testing test-copilot-push-to-pull-request-branch

[dsyme]

/test-copilot-push-to-pull-request-branch

Agentic Test Copilot Push to Branch triggered by this comment

[github-actions]

MCP Network Permissions Test Results - CRITICAL FAILURES

Test Summary

Status: ❌ FAILED - Proxy restrictions are NOT being enforced

Detailed Results

✅ Allowed Domain Test

• Domain: `(redacted)
• Expected: Access allowed
• Result: SUCCESS - Content retrieved successfully
• Details: HTML content for Example Domain was successfully fetched

❌ Blocked Domain Tests (All Failed)

1. httpbin.org Test

• URL: `(redacted)
• Expected: Network-level block (proxy denial)
• Result: FAILURE - Full access granted
• Details: Successfully retrieved JSON response with slideshow data. This should have been blocked by the Squid proxy.

2. api.github.com Test

• URL: https://api.github.com/user
• Expected: Network-level block (proxy denial)
• Result: FAILURE - Connection reached endpoint
• Details: Received HTTP 401 (Unauthorized), which confirms the request reached the GitHub API. The proxy should have blocked this before any HTTP response was received.

3. www.google.com Test

• URL: `(redacted)
• Expected: Network-level block (proxy denial)
• Result: FAILURE - Full access granted
• Details: Successfully retrieved Google homepage HTML (>5000 characters). This should have been blocked by the Squid proxy.

4. malicious-example.com Test

• URL: `(redacted)
• Expected: Network-level block (proxy denial)
• Result: INCONCLUSIVE - Connection failure (likely DNS/network issue, not proxy block)
• Details: Received "connection issue" error, but cannot confirm if this is due to proxy blocking or domain not existing.

Security Analysis

Critical Issues Identified

1. Proxy Bypass: The MCP fetch tool is bypassing the Squid proxy entirely, allowing access to all domains regardless of the allow-list configuration.

2. Configuration Not Applied: Despite the correct configuration files:

   • allowed_domains.txt specifies only example.com
   • squid.conf has rule http_access deny !allowed_domains at line 24
   • docker-compose-fetch.yml sets proxy environment variables

   The restrictions are not being enforced.

3. No Network-Level Blocking: All blocked domains returned application-level responses (HTTP status codes, HTML content, JSON data) instead of proxy-level denials.

Security Recommendations

1. Verify Proxy Configuration:

   • Check if the Squid proxy container is running and healthy
   • Verify the fetch MCP container is actually routing through the proxy
   • Inspect network traffic to confirm proxy usage

2. Test Proxy Directly:

   • Use curl with explicit proxy settings to verify Squid is blocking correctly
   • Check Squid access logs to see if requests are reaching the proxy

3. Fix Environment Variables:

   • Ensure HTTP_PROXY and HTTPS_PROXY are properly set in the fetch container
   • Verify the MCP fetch implementation respects these proxy environment variables

4. Add Certificate Validation:

   • For HTTPS proxy interception, ensure proper SSL/TLS handling
   • May need CONNECT method support verification

5. Implement Connection Testing:

   • Add startup verification that proxy restrictions work
   • Fail fast if proxy bypass is detected

Configuration Review

allowed_domains.txt (line 3):

example.com

squid.conf (line 24):

http_access deny !allowed_domains

docker-compose-fetch.yml (lines 27-30):

environment:
  - PROXY_HOST=squid-proxy
  - PROXY_PORT=3128
  - HTTP_PROXY=(redacted)
  - HTTPS_PROXY=(redacted)

Configuration appears correct but is not being enforced.

Conclusion

The MCP network permissions feature is NOT working as designed. All tested domains that should be blocked were accessible, indicating a complete bypass of the proxy restrictions. This represents a critical security vulnerability that must be addressed before this feature can be considered functional.

Next Steps:

1. Investigate why the fetch MCP is not using the configured proxy
2. Verify Squid container is running and accessible
3. Add proxy connection verification to the fetch tool
4. Re-test after fixes are implemented

AI generated by Test Claude Proxy

[github-actions]

Closed by e2e test cleanup