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Hermes Agent 7994aad8d8 security: harden lazyworkhorse with firewall, fail2ban, SSH hardening

- Firewall (default deny):
  - Allow only essential ports: SSH(2424), Gitea(2222), HTTP(80), HTTPS(443)
  - Rate limit SSH (max 4 new connections/60s)
  - Rate limit HTTP/HTTPS (25/minute)
  - Drop invalid packets, log dropped packets

- Fail2ban (auto-ban attackers):
  - SSH jail: 3 strikes = 1 hour ban
  - HTTP auth failures: 5 strikes = 1 hour ban
  - HTTP scanning: 2 strikes = 2 hour ban
  - Recidive jail: repeat offenders = 1 week ban

- SSH hardening:
  - No root login
  - Max 3 auth tries, 5 sessions
  - 30s login grace time
  - No X11/TCP/agent forwarding
  - Verbose logging

- Kernel network hardening:
  - SYN flood protection (syncookies)
  - IP spoofing protection (rp_filter)
  - Disable source routing, redirects
  - Log martian packets
  - Connection tuning for high load

- Audit logging enabled

Ports commented for review (likely internal-only):
- 8000 (Portainer), 4242 (Coms), 5000/8087/8089 (TAK)

2026-04-30 17:46:39 +00:00