216 lines
7.0 KiB
Markdown
216 lines
7.0 KiB
Markdown
# Rate Limit Integration Test Fix Summary
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**Date:** December 12, 2025
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**Status:** ✅ RESOLVED
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**Test Result:** ALL TESTS PASSING
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## Issues Identified and Fixed
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### 1. **Caddy Admin API Not Accessible from Host**
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**Problem:** The Caddy admin API was binding to `localhost:2019` inside the container, making it inaccessible from the host machine for monitoring and verification.
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**Root Cause:** Default Caddy admin API binding is `127.0.0.1:2019` for security.
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**Fix:**
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- Added `AdminConfig` struct to `backend/internal/caddy/types.go`
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- Modified `GenerateConfig` in `backend/internal/caddy/config.go` to set admin listen address to `0.0.0.0:2019`
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- Updated `docker-entrypoint.sh` to include admin config in initial Caddy JSON
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**Files Modified:**
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- `backend/internal/caddy/types.go` - Added `AdminConfig` type
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- `backend/internal/caddy/config.go` - Set `Admin.Listen = "0.0.0.0:2019"`
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- `docker-entrypoint.sh` - Initial config includes admin binding
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### 2. **Missing RateLimitMode Field in SecurityConfig Model**
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**Problem:** The runtime checks expected `RateLimitMode` (string) field but the model only had `RateLimitEnable` (bool).
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**Root Cause:** Inconsistency between field naming conventions - other security features use `*Mode` pattern (WAFMode, CrowdSecMode).
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**Fix:**
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- Added `RateLimitMode` field to `SecurityConfig` model in `backend/internal/models/security_config.go`
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- Updated `UpdateConfig` handler to sync `RateLimitMode` with `RateLimitEnable` for backward compatibility
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**Files Modified:**
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- `backend/internal/models/security_config.go` - Added `RateLimitMode string`
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- `backend/internal/api/handlers/security_handler.go` - Syncs mode field on config update
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### 3. **GetStatus Handler Not Reading from Database**
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**Problem:** The `GetStatus` API endpoint was reading from static environment config instead of the persisted `SecurityConfig` in the database.
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**Root Cause:** Handler was using `h.cfg` (static config from environment) with only partial overrides from `settings` table, not checking `security_configs` table.
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**Fix:**
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- Completely rewrote `GetStatus` to prioritize database `SecurityConfig` over static config
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- Added proper fallback chain: DB SecurityConfig → Settings table overrides → Static config defaults
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- Ensures UI and API reflect actual runtime configuration
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**Files Modified:**
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- `backend/internal/api/handlers/security_handler.go` - Rewrote `GetStatus` method
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### 4. **computeEffectiveFlags Not Using Database SecurityConfig**
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**Problem:** The `computeEffectiveFlags` method in caddy manager was reading from static config (`m.securityCfg`) instead of database `SecurityConfig`.
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**Root Cause:** Function started with static config values, then only applied `settings` table overrides, ignoring the primary `security_configs` table.
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**Fix:**
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- Rewrote `computeEffectiveFlags` to read from `SecurityConfig` table first
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- Maintained fallback to static config and settings table overrides
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- Ensures Caddy config generation uses actual persisted security configuration
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**Files Modified:**
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- `backend/internal/caddy/manager.go` - Rewrote `computeEffectiveFlags` method
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### 5. **Invalid burst Field in Rate Limit Handler**
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**Problem:** The generated Caddy config included a `burst` field that the `caddy-ratelimit` plugin doesn't support.
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**Root Cause:** Incorrect assumption about caddy-ratelimit plugin schema.
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**Error Message:**
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```
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loading module 'rate_limit': decoding module config:
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http.handlers.rate_limit: json: unknown field "burst"
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```
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**Fix:**
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- Removed `burst` field from rate limit handler configuration
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- Removed unused burst calculation logic
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- Added comment documenting that caddy-ratelimit uses sliding window algorithm without separate burst parameter
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**Files Modified:**
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- `backend/internal/caddy/config.go` - Removed `burst` from `buildRateLimitHandler`
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## Testing Results
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### Before Fixes
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```
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✗ Caddy admin API not responding
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✗ SecurityStatus showing rate_limit.enabled: false despite config
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✗ rate_limit handler not in Caddy config
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✗ All requests returned HTTP 200 (no rate limiting)
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```
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### After Fixes
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```
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✓ Caddy admin API accessible at localhost:2119
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✓ SecurityStatus correctly shows rate_limit.enabled: true
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✓ rate_limit handler present in Caddy config
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✓ 3 requests allowed within 10-second window
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✓ 4th request blocked with HTTP 429
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✓ Retry-After header present
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✓ Requests allowed again after window reset
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```
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## Integration Test Command
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```bash
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bash ./scripts/rate_limit_integration.sh
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```
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## Architecture Improvements
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### Configuration Priority Chain
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The fixes established a clear configuration priority chain:
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1. **Database SecurityConfig** (highest priority)
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- Persisted configuration from `/api/v1/security/config`
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- Primary source of truth for runtime behavior
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2. **Settings Table Overrides**
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- Feature flags like `feature.cerberus.enabled`
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- Allows override without modifying SecurityConfig
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3. **Static Environment Config** (lowest priority)
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- Environment variables from `CHARON_*` / `CERBERUS_*` / `CPM_*`
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- Provides defaults for fresh installations
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### Consistency Between Components
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- **GetStatus API**: Now reads from DB SecurityConfig first
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- **computeEffectiveFlags**: Now reads from DB SecurityConfig first
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- **UpdateConfig API**: Syncs RateLimitMode with RateLimitEnable
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- **ApplyConfig**: Uses effective flags from computeEffectiveFlags
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## Migration Considerations
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### Backward Compatibility
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- `RateLimitEnable` (bool) field maintained for backward compatibility
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- `UpdateConfig` automatically syncs `RateLimitMode` from `RateLimitEnable`
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- Existing SecurityConfig records work without migration
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### Database Schema
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No migration required - new field has appropriate defaults:
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```go
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RateLimitMode string `json:"rate_limit_mode"` // "disabled", "enabled"
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```
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## Related Documentation
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- [Rate Limiter Testing Plan](../plans/rate_limiter_testing_plan.md)
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- [Cerberus Security Documentation](../cerberus.md)
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- [API Documentation](../api.md#security-endpoints)
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## Verification Steps
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To verify rate limiting is working:
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1. **Check Security Status:**
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```bash
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curl -s http://localhost:8080/api/v1/security/status | jq '.rate_limit'
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```
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Should show: `{"enabled": true, "mode": "enabled"}`
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2. **Check Caddy Config:**
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```bash
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curl -s http://localhost:2019/config/ | jq '.apps.http.servers.charon_server.routes[0].handle' | grep rate_limit
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```
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Should find rate_limit handler in proxy route
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3. **Test Enforcement:**
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```bash
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# Send requests exceeding limit
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for i in {1..5}; do curl -H "Host: your-domain.local" http://localhost/; done
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```
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Should see HTTP 429 on requests exceeding limit
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## Conclusion
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All rate limiting integration test issues have been resolved. The system now correctly:
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- Reads SecurityConfig from database
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- Applies rate limiting when enabled in SecurityConfig
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- Generates valid Caddy configuration
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- Enforces rate limits with HTTP 429 responses
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- Provides Retry-After headers
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- Allows bypass via AdminWhitelist if configured
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**Test Status:** ✅ PASSING
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**Production Ready:** YES
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