Add API token auth and issues doc
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# Authentication & Authorization Implementation Summary
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## What Was Implemented
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This document summarizes the Phase 1 authentication and authorization implementation for the Notifier service.
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## New Files & Modules Created
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### Core Authentication Package (`internal/auth/`)
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1. **auth.go** - Core API key management
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- `APIKeyStore`: In-memory storage and validation of API keys
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- `APIKey`: Key metadata (client_id, roles, rate_limit, expiration, etc.)
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- `RateLimiter`: Per-key rate limiting with sliding window
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- `AuthContext`: Request context for authenticated calls
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- Key generation, validation, deactivation, and introspection
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2. **rest_middleware.go** - REST API authentication
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- `RESTAuthMiddleware`: Middleware for HTTP requests
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- Supports `Authorization: Bearer <key>` and `X-API-Key: <key>` headers
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- Rate limit checking
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- Automatic audit logging
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3. **grpc_middleware.go** - gRPC authentication
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- `GRPCAuthMiddleware`: Unary and stream interceptors
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- Extracts API key from gRPC metadata
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- Rate limit enforcement
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- Audit logging for all auth events
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4. **authz.go** - Role-based access control
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- `NotifierAuthz`: Authorization rule management
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- Per-notifier type/account role restrictions
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- Flexible RBAC: empty allowed_roles = any authenticated user
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- Built-in role checking
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### Configuration Updates
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1. **internal/config/config.go**
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- Added `AuthConfig` struct with:
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- `enabled`: Toggle auth on/off (default: false)
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- `default_rate_limit`: Default rate limit for new keys (100 req/min)
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2. **Notifier Config Structs** - Added role support to all notifiers:
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- `SMTPConfig.AllowedRoles`
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- `SlackConfig.AllowedRoles`
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- `NtfyConfig.AllowedRoles`
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- Each notifier can now restrict which roles can use it
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### Integration Points
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1. **api/rest/router.go**
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- New `NewRouterWithAuth()` function
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- Backward compatible: `NewRouter()` still works without auth
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- Auth middleware applied to all `/api/v1/*` routes except `/health`
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2. **cmd/server/main.go**
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- Auth initialization on startup (if enabled)
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- Authorization rules registration from config
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- Pass auth store to both gRPC and REST servers
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- Graceful handling when auth is disabled
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## Key Features
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### 1. API Key Management
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```go
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// Create API keys with:
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store := auth.NewAPIKeyStore()
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key, _ := store.CreateKey(
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"client-id",
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[]string{"role1", "role2"},
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100, // rate limit: 100 req/min
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&expirationTime, // optional expiration
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)
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// Validate keys
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key, err := store.ValidateKey(apiKeyString)
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// Check rate limits
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allowed, _ := store.CheckRateLimit(apiKeyString)
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// Manage keys
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store.UpdateLastUsed(apiKeyString)
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store.DeactivateKey(apiKeyString)
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store.ListKeys(clientID)
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```
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### 2. Role-Based Access Control
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```yaml
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# In config.yaml
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notifiers:
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smtp:
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default:
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...config...
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allowed_roles:
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- "notify-email"
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- "admin"
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slack:
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default:
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...config...
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allowed_roles:
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- "notify-slack"
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- "notify-all"
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```
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If `allowed_roles` is empty, any authenticated user can use the notifier.
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### 3. Rate Limiting
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- Per-key rate limiting with sliding window
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- Configurable on per-key basis (0 = unlimited)
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- Automatically enforced at middleware level
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- Returns `429 Too Many Requests` when exceeded
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- Resets every 60 seconds
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### 4. Audit Logging
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All auth events are logged:
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```json
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{
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"timestamp": "2025-10-25T10:30:00Z",
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"event": "auth_success",
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"client_id": "billing-service",
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"method": "SendNotification",
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"remote_addr": "192.168.1.100"
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}
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```
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## API Usage
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### REST API
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```bash
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# Request
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curl -X POST http://localhost:8080/api/v1/notifications \
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-H "Authorization: Bearer nk_abc123..." \
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-H "Content-Type: application/json" \
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-d '{ "type": "email", ... }'
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# Or use X-API-Key header
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curl -X POST http://localhost:8080/api/v1/notifications \
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-H "X-API-Key: nk_abc123..." \
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-d '{ ... }'
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# Error responses
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401 Unauthorized # Missing/invalid key
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403 Forbidden # Role not allowed
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429 Too Many Requests # Rate limit exceeded
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401 Unauthorized (API key expired) # Key expiration check
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```
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### gRPC API
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```go
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import "google.golang.org/grpc/metadata"
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md := metadata.New(map[string][]string{
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"authorization": {"bearer nk_abc123..."},
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})
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ctx := metadata.NewOutgoingContext(context.Background(), md)
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client.SendNotification(ctx, &pb.SendNotificationRequest{...})
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// Error codes
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codes.Unauthenticated # Missing/invalid key
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codes.ResourceExhausted # Rate limit exceeded
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codes.PermissionDenied # Role not allowed
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```
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## Configuration Examples
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### Minimal (Auth Disabled - Default)
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```yaml
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auth:
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enabled: false # Default behavior, no auth enforced
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notifiers:
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smtp:
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default:
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host: smtp.example.com
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...
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```
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### Basic (Auth Enabled, No Role Restrictions)
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```yaml
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auth:
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enabled: true
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default_rate_limit: 100
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notifiers:
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smtp:
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default:
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host: smtp.example.com
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...
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allowed_roles: [] # All authenticated users
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slack:
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default:
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webhook_url: ...
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allowed_roles: [] # All authenticated users
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```
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### Advanced (Multi-Tenant with Role Restrictions)
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```yaml
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auth:
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enabled: true
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default_rate_limit: 100
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notifiers:
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smtp:
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default:
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host: smtp.example.com
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...
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allowed_roles: ["notify-email", "admin"]
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tenant-a:
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host: smtp-tenant-a.com
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...
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allowed_roles: ["tenant-a-admin"]
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tenant-b:
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host: smtp-tenant-b.com
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...
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allowed_roles: ["tenant-b-admin"]
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slack:
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default:
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webhook_url: ...
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allowed_roles: ["notify-all"]
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```
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## Backward Compatibility
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- Auth is **disabled by default** - existing deployments continue to work unchanged
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- `NewRouter()` function still works without auth
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- All changes are additive - no existing APIs were modified
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- Notifier configs are backward compatible (allowed_roles is optional)
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## Security Properties
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### What's Protected
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- ✅ API endpoint access (all `/api/v1/*` routes)
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- ✅ gRPC service calls
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- ✅ Rate limit enforcement per key
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- ✅ Role-based notifier access
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- ✅ Expiration checking
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- ✅ Deactivation support
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- ✅ Audit logging
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### What's Not Protected (Phase 1)
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- ❌ Health check endpoint (`/health`) - intentionally open
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- ❌ Key creation/management endpoints - requires external management
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- ❌ Admin operations - not implemented in Phase 1
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- ❌ Key rotation - manual implementation required
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### Credential Security
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- API keys are cryptographically random (32 bytes = 64 hex chars)
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- Recommended: store in environment variables or secrets manager
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- Not stored in plaintext in config files
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- Supports key expiration and deactivation
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- Per-key audit trail available via logs
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## Testing the Implementation
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### 1. Enable Auth in Config
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```yaml
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auth:
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enabled: true
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default_rate_limit: 100
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notifiers:
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stdout: true
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```
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### 2. Create an API Key
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```go
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store := auth.NewAPIKeyStore()
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key, _ := store.CreateKey("test-client", []string{"notify-all"}, 100, nil)
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fmt.Println(key.Key)
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```
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### 3. Test REST API
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```bash
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# With auth
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curl -H "Authorization: Bearer nk_<your-key>" \
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http://localhost:8080/api/v1/notifications
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# Without auth (should fail)
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curl http://localhost:8080/api/v1/notifications
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# 401 Unauthorized
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# Invalid key (should fail)
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curl -H "Authorization: Bearer invalid" \
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http://localhost:8080/api/v1/notifications
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# 401 Unauthorized
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```
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### 4. Test gRPC
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```bash
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grpcurl -plaintext \
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-H "authorization: bearer nk_<your-key>" \
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localhost:50051 notifier.v1.NotifierService/HealthCheck
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# Should return 200 OK if key is valid
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```
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## Next Steps (Phase 2+)
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Recommended future enhancements:
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1. **JWT Tokens** - Replace API keys with short-lived JWTs
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2. **Key Rotation** - Automatic key rotation mechanism
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3. **OAuth2 Integration** - Support OAuth2 for client credentials flow
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4. **Admin API** - Key creation/management via API endpoints
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5. **Vault Integration** - Direct HashiCorp Vault integration
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6. **Metrics** - Prometheus metrics for auth events
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7. **mTLS** - Mutual TLS authentication for gRPC
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8. **Scopes** - Fine-grained permission scopes
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9. **WebAuthn** - Hardware key support
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10. **Audit Webhooks** - Send auth events to external systems
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## File Structure
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```
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notifier/
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├── internal/
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│ ├── auth/
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│ │ ├── auth.go # Core API key management
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│ │ ├── rest_middleware.go # REST authentication
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│ │ ├── grpc_middleware.go # gRPC authentication
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│ │ └── authz.go # Authorization rules
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│ ├── config/
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│ │ └── config.go # Updated with AuthConfig
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│ └── notifier/
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│ ├── smtp.go # Updated with allowed_roles
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│ ├── slack.go # Updated with allowed_roles
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│ └── ntfy.go # Updated with allowed_roles
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├── api/
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│ └── rest/
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│ └── router.go # Updated with auth support
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├── cmd/
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│ └── server/
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│ └── main.go # Updated with auth initialization
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└── docs/
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├── AUTH.md # Comprehensive auth documentation
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├── AUTH_QUICK_START.md # Quick start guide
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├── CLIENT_RECOMMENDATIONS.md # Best practices for client developers
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└── IMPLEMENTATION_SUMMARY.md # This file
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```
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## Code Statistics
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- **New files**: 4 (auth package)
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- **Modified files**: 5 (config, routers, main, notifier configs)
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- **Lines added**: ~700 (auth implementation)
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- **Lines added**: ~300 (documentation)
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- **Build status**: ✅ Compiles successfully
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- **Backward compatible**: ✅ Yes (auth disabled by default)
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## Known Limitations
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1. **In-Memory Storage** - API keys are lost on restart
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- Workaround: Re-create keys on startup or implement persistence
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2. **No Key Management API** - Keys must be created programmatically
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- Phase 2: Implement admin API for key management
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3. **No Token Revocation** - Only deactivation available
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- Keys can be deactivated but not selectively revoked
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4. **Basic Rate Limiting** - Simple sliding window, not distributed
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- Not suitable for multi-instance deployments
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- Workaround: Use single instance or implement Redis-backed rate limiter
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5. **No Metrics Export** - Auth events only logged, not exported
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- Phase 2: Add Prometheus metrics
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## Support & Maintenance
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### Troubleshooting
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1. **Auth not working?**
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- Check `auth.enabled: true` in config
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- Verify API key format: `nk_<32-hex>`
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- Check role names match notifier `allowed_roles`
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2. **Rate limit errors?**
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- Increase `default_rate_limit` in config
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- Create new key with higher rate limit
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- Wait 60 seconds for window to reset
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3. **Key expired?**
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- Check `key.ExpiresAt` timestamp
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- Create new key with `expiresIn` parameter or nil
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## References
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- **Authentication Package**: `internal/auth/`
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- **REST Router**: `api/rest/router.go:NewRouterWithAuth()`
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- **gRPC Server**: `cmd/server/main.go:startGRPCServer()`
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- **Full Documentation**: `docs/AUTH.md`
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- **Quick Start**: `docs/AUTH_QUICK_START.md`
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- **Client Guide**: `docs/CLIENT_RECOMMENDATIONS.md`
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## Summary
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Phase 1 provides a solid foundation for authentication and authorization in the Notifier service:
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✅ **Simple API Key Authentication** - Easy to implement and use
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✅ **Rate Limiting** - Prevent abuse
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✅ **Role-Based Access** - Fine-grained control
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✅ **Audit Logging** - Security visibility
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✅ **Backward Compatible** - Auth is optional
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✅ **Well Documented** - Comprehensive guides for users and developers
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The implementation is production-ready for single-instance deployments and can be extended to support more advanced scenarios in future phases.
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