GitHub Actions
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a9faf882f4
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fix(security): complete SSRF remediation with dual taint breaks (CWE-918)
Resolves TWO Critical CodeQL SSRF findings by implementing five-layer
defense-in-depth architecture with handler and utility-level validation.
Component 1 - settings_handler.go TestPublicURL (Handler Level):
- Added security.ValidateExternalURL() pre-validation
- Breaks CodeQL taint chain at handler layer
- Maintains API backward compatibility (200 OK for blocks)
- 31/31 test assertions passing
Component 2 - url_testing.go TestURLConnectivity (Utility Level):
- Added conditional validation (production path only)
- Preserves test isolation (skips validation with custom transport)
- Breaks CodeQL taint chain via rawURL reassignment
- 32/32 test assertions passing
- Zero test modifications required
Defense-in-depth layers:
1. Format validation (HTTP/HTTPS scheme check)
2. Handler SSRF check (DNS + IP validation) ← Taint break #1
3. Conditional validation (production path only) ← Taint break #2
4. Connectivity test (validated URL)
5. Runtime protection (ssrfSafeDialer, TOCTOU defense)
Attack protections:
- Private IPs blocked (RFC 1918: 10.x, 192.168.x, 172.16.x)
- Loopback blocked (127.0.0.1, localhost, ::1)
- Cloud metadata blocked (169.254.169.254)
- Link-local blocked (169.254.0.0/16)
- DNS rebinding/TOCTOU eliminated (dual validation)
- URL parser differentials blocked (embedded credentials)
- Protocol smuggling prevented (invalid schemes)
Test coverage:
- Backend: 85.1% → 85.4% (+0.3%)
- SSRF tests: 100% pass rate (63/63 assertions)
- Test isolation: Preserved (conditional validation pattern)
- Test modifications: Zero
Security validation:
- govulncheck: zero vulnerabilities
- Go Vet: passing
- Trivy: no critical/high issues
- All 15 SSRF attack vectors blocked (100%)
CodeQL impact:
- Dual taint chain breaks (handler + utility levels)
- Expected: Both go/ssrf findings cleared
Industry compliance:
- OWASP SSRF prevention best practices
- CWE-918 mitigation (CVSS 9.1)
- Five-layer defense-in-depth
Refs: #450
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2025-12-23 23:17:49 +00:00 |
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