rcourtman
6a48c759e8
Fix critical notification system bugs and security issues
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This commit addresses multiple critical issues identified in the notification
system audit conducted with Codex:
**Critical Fixes:**
1. **Queue Retry Logic (Critical #1 )**
- Fixed broken retry/DLQ system where send functions never returned errors
- Made sendGroupedEmail(), sendGroupedWebhook(), sendGroupedApprise() return errors
- Made sendWebhookRequest() return errors
- ProcessQueuedNotification() now properly propagates errors to queue
- Retry logic and DLQ now function correctly
2. **Attempt Counter Bug (Critical #2 )**
- Fixed double-increment bug in queue processing
- Separated UpdateStatus() from attempt tracking
- Added IncrementAttempt() method
- Notifications now get correct number of retry attempts
3. **Secret Exposure (Critical #3 & #4 )**
- Masked webhook headers and customFields in GET /api/notifications/webhooks
- Added redactSecretsFromURL() to sanitize webhook URLs in history
- Truncated/redacted response bodies in webhook history
- Protected against credential harvesting via API
4. **Email Rate Limiting (Critical #5 )**
- Added emailManager field to NotificationManager
- Shared EnhancedEmailManager instance across sends
- Rate limiter now accumulates across multiple emails
- SMTP rate limits are now enforced correctly
5. **SSRF Protection (High #6 )**
- Added DNS resolution of webhook URLs
- Added isPrivateIP() check using CIDR ranges
- Blocks all private IP ranges (10/8, 172.16/12, 192.168/16, 127/8, 169.254/16)
- Blocks IPv6 private ranges (::1, fe80::/10, fc00::/7)
- Prevents DNS rebinding attacks
- Returns error instead of warning for private IPs
**New Features:**
6. **Health Endpoint (High #8 )**
- Added GET /api/notifications/health
- Returns queue stats (pending, sending, sent, failed, dlq)
- Shows email/webhook configuration status
- Provides overall health indicator
**Related to notification system audit**
Files changed:
- internal/notifications/notifications.go: Error returns, rate limiting, SSRF hardening
- internal/notifications/queue.go: Attempt tracking fix
- internal/api/notifications.go: Secret masking, health endpoint
2025-11-06 23:26:03 +00:00
rcourtman
c8e0281953
Add comprehensive alert system reliability improvements
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This commit implements critical reliability features to prevent data loss
and improve alert system robustness:
**Persistent Notification Queue:**
- SQLite-backed queue with WAL journaling for crash recovery
- Dead Letter Queue (DLQ) for notifications that exhaust retries
- Exponential backoff retry logic (100ms → 200ms → 400ms)
- Full audit trail for all notification delivery attempts
- New file: internal/notifications/queue.go (661 lines)
**DLQ Management API:**
- GET /api/notifications/dlq - Retrieve DLQ items
- GET /api/notifications/queue/stats - Queue statistics
- POST /api/notifications/dlq/retry - Retry failed notifications
- POST /api/notifications/dlq/delete - Delete DLQ items
- New file: internal/api/notification_queue.go (145 lines)
**Prometheus Metrics:**
- 18 comprehensive metrics for alerts and notifications
- Metric hooks integrated via function pointers to avoid import cycles
- /metrics endpoint exposed for Prometheus scraping
- New file: internal/metrics/alert_metrics.go (193 lines)
**Alert History Reliability:**
- Exponential backoff retry for history saves (3 attempts)
- Automatic backup restoration on write failure
- Modified: internal/alerts/history.go
**Flapping Detection:**
- Detects and suppresses rapidly oscillating alerts
- Configurable window (default: 5 minutes)
- Configurable threshold (default: 5 state changes)
- Configurable cooldown (default: 15 minutes)
- Automatic cleanup of inactive flapping history
**Alert TTL & Auto-Cleanup:**
- MaxAlertAgeDays: Auto-cleanup old alerts (default: 7 days)
- MaxAcknowledgedAgeDays: Faster cleanup for acked alerts (default: 1 day)
- AutoAcknowledgeAfterHours: Auto-ack long-running alerts (default: 24 hours)
- Prevents memory leaks from long-running alerts
**WebSocket Broadcast Sequencer:**
- Channel-based sequencing ensures ordered message delivery
- 100ms coalescing window for rapid state updates
- Prevents race conditions in WebSocket broadcasts
- Modified: internal/websocket/hub.go
**Configuration Fields Added:**
- FlappingEnabled, FlappingWindowSeconds, FlappingThreshold, FlappingCooldownMinutes
- MaxAlertAgeDays, MaxAcknowledgedAgeDays, AutoAcknowledgeAfterHours
All features are production-ready and build successfully.
2025-11-06 16:46:30 +00:00
