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🔴 MCP Network Permissions Test - CRITICAL FAILURES DETECTED

Test Summary

FAIL - The MCP network permissions feature is NOT working as intended. Multiple blocked domains were successfully accessed.

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Test Results

Domain	Expected Result	Actual Result	Status
`(redacted)	✅ Allow (whitelisted)	✅ Successfully accessed	PASS
`(redacted)	❌ Block	✅ Successfully accessed	FAIL 🔴
https://api.github.com/user	❌ Block	✅ Reached server (401 error)	FAIL 🔴
`(redacted)	❌ Block	✅ Successfully accessed	FAIL 🔴
`(redacted)	❌ Block	❌ Connection failed	INCONCLUSIVE ⚠️

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Critical Security Issues

1. Proxy Not Enforcing Domain Restrictions

The Squid proxy is NOT blocking unauthorized domains as configured. Three out of four blocked domains were successfully accessed:

• httpbin.org: Full JSON response received
• api.github.com: Request reached GitHub's servers (received 401 authentication error)
• www.google.com: Full HTML page retrieved

2. Network-Level Enforcement Failure

The expected behavior was that blocked requests would fail at the network level (proxy enforcement). Instead:

• Requests are passing through to external servers
• Only example.com should be accessible, but the proxy is allowing all domains
• The whitelist configuration is not being respected

3. Configuration Issues

Potential root causes:

1. The allowed_domains.txt file may not be properly loaded by Squid
2. Squid ACL rules may be misconfigured or not applied
3. The MCP fetch tool may not be routing through the proxy
4. Proxy environment variables may not be set correctly

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Detailed Error Messages

httpbin.org (SHOULD BE BLOCKED):

✅ Successfully fetched and received JSON content

api.github.com (SHOULD BE BLOCKED):

❌ Failed to fetch https://api.github.com/user - status code 401

Note: The 401 indicates the request reached GitHub's servers instead of being blocked by proxy

www.google.com (SHOULD BE BLOCKED):

✅ Successfully fetched and received HTML content

malicious-example.com (BLOCKED BUT INCONCLUSIVE):

❌ Failed to fetch robots.txt (redacted) due to a connection issue

Note: This failed due to DNS/connection issues, not proxy blocking

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Security Recommendations

1. IMMEDIATE: Verify Squid proxy configuration and ACL rules
2. IMMEDIATE: Ensure the MCP fetch tool is correctly configured to use the proxy
3. IMMEDIATE: Check that allowed_domains.txt is being read and applied
4. HIGH PRIORITY: Add logging to verify which requests are hitting the proxy
5. HIGH PRIORITY: Test proxy behavior with direct curl commands through the proxy
6. MEDIUM: Consider implementing network-level restrictions (iptables/firewall rules) as a backup
7. MEDIUM: Add integration tests that verify proxy enforcement before deployment

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Required Actions

• Investigate why Squid is not blocking unauthorized domains
• Verify MCP fetch tool proxy configuration
• Test proxy directly with curl/wget commands
• Review docker-compose network configuration
• Add proxy access logs for debugging
• Re-test after fixes are applied

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Test Environment

• Date: 2025-10-11
• Platform: Linux 6.11.0-1018-azure
• Branch: test-pr-1760182927
• Proxy: Squid (via docker-compose-fetch.yml)
• Allowed domains file: allowed_domains.txt

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⚠️ This is a critical security issue that must be resolved before this feature can be considered functional.

AI generated by Test Claude Proxy

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Closed by e2e test cleanup