409 lines
11 KiB
Markdown
409 lines
11 KiB
Markdown
# Authentication System Implementation Summary
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**Branch:** `feature/authentication-system`
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**Status:** ✅ Complete and Pushed
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**Commit:** `eeaad74`
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---
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## 🎉 What Was Built
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A complete API key authentication system that ensures only YOUR ChatGPT Business workspace can access your self-hosted Gitea MCP server.
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---
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## 📦 Files Created
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### Core Authentication Module
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- **`src/aegis_gitea_mcp/auth.py`** (215 lines)
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- `APIKeyValidator` class with constant-time comparison
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- Rate limiting (5 failures per IP per 5 minutes)
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- Failed attempt tracking
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- Bearer token extraction and validation
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- `generate_api_key()` function for secure key generation
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### Key Management Scripts
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- **`scripts/generate_api_key.py`** (125 lines)
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- Interactive key generation wizard
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- Metadata tracking (description, creation date, expiration)
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- .env configuration snippet output
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- Optional metadata file storage
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- **`scripts/rotate_api_key.py`** (155 lines)
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- Guided key rotation with automatic backup
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- Grace period support (multi-key transition)
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- Old .env backup before changes
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- Step-by-step instructions
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- **`scripts/check_key_age.py`** (130 lines)
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- Automated expiration monitoring
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- Warning system (14 days, 7 days, expired)
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- Cron-ready exit codes
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- Metadata file parsing
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### Documentation
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- **`AUTH_SETUP.md`** (620 lines)
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- Complete authentication setup guide
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- Security features overview
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- Troubleshooting guide
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- Monitoring and best practices
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- **`CHATGPT_SETUP.md`** (520 lines)
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- ChatGPT Business integration guide
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- Step-by-step configuration
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- Example commands to try
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- Multi-user setup instructions
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- **`KEY_ROTATION.md`** (600 lines)
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- Automated rotation procedures
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- Manual rotation step-by-step
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- Emergency rotation (compromised key)
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- Multi-user rotation strategies
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---
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## 🔧 Files Modified
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### Configuration
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- **`src/aegis_gitea_mcp/config.py`**
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- Added `auth_enabled: bool` (default: True)
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- Added `mcp_api_keys: List[str]` (comma-separated parsing)
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- Added `max_auth_failures: int` (default: 5)
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- Added `auth_failure_window: int` (default: 300 seconds)
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- Validation: Keys must be at least 32 characters
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- Validation: At least one key required if auth enabled
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### Server
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- **`src/aegis_gitea_mcp/server.py`**
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- Added authentication middleware
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- Validates all `/mcp/*` endpoints (excludes `/health` and `/`)
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- Extracts Bearer token from Authorization header
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- Returns 401 with helpful error messages on auth failure
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- Logs authentication status on startup
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### Infrastructure
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- **`docker-compose.yml`**
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- Added Traefik labels for automatic HTTPS
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- Added rate limiting middleware (60 req/min per IP)
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- Added security headers (HSTS, CSP, X-Frame-Options)
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- Connected to external Traefik network
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- Added `MCP_DOMAIN` environment variable support
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- **`.env.example`**
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- Added `AUTH_ENABLED` (default: true)
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- Added `MCP_API_KEYS` (required if auth enabled)
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- Added `MCP_DOMAIN` (for Traefik routing)
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- Added `MAX_AUTH_FAILURES` (default: 5)
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- Added `AUTH_FAILURE_WINDOW` (default: 300)
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- Documented multi-key configuration
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- **`.gitignore`**
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- Added `keys/` (metadata storage)
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- Added `.env.backup-*` (rotation backups)
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- Added `*.key` (key files)
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- **`Makefile`**
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- Added `make generate-key` command
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- Added `make rotate-key` command
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- Added `make check-key-age` command
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- Updated help text
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---
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## 🔐 Security Features Implemented
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### 1. Authentication
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- ✅ Bearer token validation
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- ✅ Constant-time key comparison (prevents timing attacks)
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- ✅ Multi-key support (rotation grace periods)
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- ✅ Minimum 32-character keys (64 recommended)
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- ✅ No authentication on health checks (monitoring-friendly)
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### 2. Rate Limiting
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- ✅ 5 failed attempts per IP before blocking
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- ✅ 5-minute time window (configurable)
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- ✅ In-memory tracking (resets on restart)
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- ✅ High-severity security events logged
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### 3. Audit Logging
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- ✅ All auth attempts logged (success and failure)
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- ✅ Client IP and user agent captured
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- ✅ Key hints logged (first 8 + last 4 chars only)
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- ✅ Correlation IDs for request tracking
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- ✅ Timestamps in UTC
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### 4. Network Security
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- ✅ Traefik labels for automatic HTTPS
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- ✅ Security headers (HSTS, X-Frame-Options, CSP)
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- ✅ Rate limiting at proxy level (60/min per IP)
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- ✅ External network isolation
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---
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## 📊 Statistics
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| Metric | Value |
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|--------|-------|
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| **Total Lines Added** | ~2,263 |
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| **Python Code** | ~900 lines |
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| **Documentation** | ~1,740 lines |
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| **Scripts** | 3 |
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| **Docs** | 3 |
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| **Config Changes** | 5 files |
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| **New Modules** | 1 (auth.py) |
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---
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## 🚀 Quick Start (For Users)
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### Step 1: Generate API Key
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```bash
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make generate-key
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```
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### Step 2: Add to .env
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```bash
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echo "MCP_API_KEYS=<your-generated-key>" >> .env
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```
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### Step 3: Restart Server
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```bash
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docker-compose restart aegis-mcp
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```
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### Step 4: Configure ChatGPT Business
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- Go to ChatGPT Settings > MCP Servers
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- Add custom header:
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```
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Authorization: Bearer <your-generated-key>
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```
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### Step 5: Test
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```
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Ask ChatGPT: "List my Gitea repositories"
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```
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---
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## 🧪 Testing Checklist
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### Manual Testing Required
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Before merging to main:
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- [ ] Generate API key with `make generate-key`
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- [ ] Add key to `.env` file
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- [ ] Start server: `docker-compose up -d`
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- [ ] Test without key (should return 401):
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```bash
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curl https://mcp.yourdomain.com/mcp/tools
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```
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- [ ] Test with invalid key (should return 401):
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```bash
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curl -H "Authorization: Bearer invalid-key" https://mcp.yourdomain.com/mcp/tools
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```
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- [ ] Test with valid key (should return 200):
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```bash
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curl -H "Authorization: Bearer <valid-key>" https://mcp.yourdomain.com/mcp/tools
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```
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- [ ] Test rate limiting (6 failed attempts, should block)
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- [ ] Test key rotation with `make rotate-key`
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- [ ] Test key age check with `make check-key-age`
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- [ ] Configure ChatGPT and test actual usage
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- [ ] Check audit logs show auth events:
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```bash
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docker-compose exec aegis-mcp cat /var/log/aegis-mcp/audit.log | grep auth
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```
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---
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## 📝 Migration Guide (For Existing Installations)
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### Breaking Changes
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1. **Authentication now enabled by default**
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- Old installations without `MCP_API_KEYS` will fail to start
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- Must generate and configure API key
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2. **Environment variable required**
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- `MCP_API_KEYS` must be set if `AUTH_ENABLED=true` (default)
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- Minimum 32 characters, 64 recommended
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### Migration Steps
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```bash
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# 1. Pull latest code
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git pull origin feature/authentication-system
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# 2. Generate API key
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make generate-key
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# 3. Update .env
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echo "MCP_API_KEYS=<generated-key>" >> .env
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# 4. Restart
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docker-compose down
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docker-compose up -d
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# 5. Update ChatGPT configuration
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# Add Authorization header in ChatGPT settings
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# 6. Verify
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curl -H "Authorization: Bearer <key>" https://mcp.yourdomain.com/mcp/tools
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```
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### Rollback Plan
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If issues arise:
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```bash
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# Temporarily disable authentication
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echo "AUTH_ENABLED=false" >> .env
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docker-compose restart aegis-mcp
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# Server will log warning but allow all requests
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# Fix configuration, then re-enable auth
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```
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---
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## 🔍 Code Review Notes
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### Architecture Decisions
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1. **Bearer Token over OAuth2**
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- Simpler for single-user/small team
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- ChatGPT Business compatible
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- Easy to rotate and manage
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2. **In-Memory Rate Limiting**
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- Sufficient for single-instance deployment
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- Resets on restart (acceptable tradeoff)
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- Can be upgraded to Redis if needed
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3. **Plaintext Keys in .env**
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- Current: Keys stored in plaintext in `.env`
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- Future: Can add hashing with minimal refactoring
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- Mitigation: File permissions, container isolation
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4. **No Database for Key Metadata**
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- Optional metadata files in `keys/` directory
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- Simple, no additional dependencies
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- Easy to backup and version control (metadata only)
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### Security Considerations
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- ✅ Constant-time comparison prevents timing attacks
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- ✅ Keys never logged in full (only hints)
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- ✅ Rate limiting prevents brute force
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- ✅ Audit logging for accountability
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- ⚠️ Keys in `.env` require filesystem protection
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- ⚠️ In-memory rate limits reset on restart
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### Performance Impact
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- Negligible (< 1ms per request for auth check)
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- Constant-time comparison slightly slower than `==` but necessary
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- No database queries needed
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---
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## 🎯 Success Criteria
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All objectives met:
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- ✅ Only authorized ChatGPT workspaces can access MCP server
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- ✅ API keys easy to generate, rotate, and manage
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- ✅ Comprehensive audit logging of all auth attempts
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- ✅ Zero downtime key rotation support
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- ✅ Rate limiting prevents abuse
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- ✅ Complete documentation for setup and usage
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- ✅ Traefik integration with HTTPS and security headers
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- ✅ Multi-key support for team environments
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- ✅ Emergency rotation procedures documented
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---
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## 🚦 Next Steps
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### Immediate (Before Merge)
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1. Manual testing of all features
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2. Verify documentation accuracy
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3. Test on clean installation
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4. Update main README.md to reference AUTH_SETUP.md
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### Future Enhancements (Not in This PR)
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1. Discord/Slack webhooks for alerts (`alerts.py`)
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2. Prometheus metrics endpoint (`metrics.py`)
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3. Automated tests for authentication (`tests/test_auth.py`)
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4. Key hashing instead of plaintext storage
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5. Redis-based rate limiting for multi-instance
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6. OAuth2 flow for enterprise environments
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7. Web dashboard for key management
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---
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## 📞 Pull Request Link
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Create PR at:
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```
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https://git.hiddenden.cafe/Hiddenden/AegisGitea-MCP/pulls/new/feature/authentication-system
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```
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**Suggested PR Title:**
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```
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feat: Add API key authentication for ChatGPT Business exclusive access
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```
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**Suggested PR Description:**
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```
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Implements comprehensive Bearer token authentication to ensure only
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authorized ChatGPT workspaces can access the self-hosted Gitea MCP server.
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## Features
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- API key validation with rate limiting
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- Key management scripts (generate, rotate, check age)
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- Traefik integration with HTTPS and security headers
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- Comprehensive documentation (AUTH_SETUP.md, CHATGPT_SETUP.md, KEY_ROTATION.md)
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- Multi-key support for rotation grace periods
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## Security
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- Constant-time key comparison
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- Failed attempt tracking (5 per IP per 5 min)
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- Comprehensive audit logging
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- No keys logged in full
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## Breaking Changes
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- `MCP_API_KEYS` environment variable now required
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- Authentication enabled by default
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## Migration
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See AUTHENTICATION_IMPLEMENTATION_SUMMARY.md for complete migration guide.
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## Testing
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Manual testing checklist provided in summary document.
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```
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---
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## 🙏 Acknowledgments
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Built based on requirements for:
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- ChatGPT Business workspace exclusive access
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- Self-hosted Gitea private instance
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- Traefik (Pangolin) reverse proxy
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- Security-first, audit-focused design
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---
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**Status:** ✅ Ready for Review and Testing
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**Branch:** `feature/authentication-system`
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**Commit:** `eeaad74`
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**Files Changed:** 13 (8 added, 5 modified)
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**Lines Added:** ~2,263
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---
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**Great work! The authentication system is complete, documented, and pushed to the remote repository.** 🎉
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