OPNsense / pfSense Firewall Operations

OPNsense / pfSense Firewall Operations

Audit availability: Real writes require a committed pending audit row and stop before contacting the platform if storage is unavailable. Reads and previews may continue with a warning; new audit rows store outcome summaries rather than full responses.

Governed, audited AI-ops for OPNsense and pfSense firewalls — for AI agents (via MCP) and humans (via CLI).

Disclaimer: Community-maintained open-source project. Not affiliated with, endorsed by, or sponsored by the OPNsense project, Deciso, Netgate, or the pfSense project. OPNsense, pfSense and Netgate are trademarks of their respective owners. MIT licensed.

firewall-aiops speaks to two firewall platforms behind one MCP server — OPNsense (REST API under /api/..., API key+secret via HTTP Basic auth) and pfSense (REST API v2 under /api/v2/... from the pfSense-pkg-RESTAPI package, API key via an X-API-Key header) — with the same tools working on both. Each target in the config names its own platform; a name-keyed platform registry selects the API shape (auth + resource paths), so an agent never has to know which firewall it is talking to.

Every tool runs through a built-in governance harness (vendored, zero external dependency): audit log, token/call budget with runaway circuit-breaker, descriptive risk-tier labelling, undo-token recording, and prompt-injection sanitisation.

Why this exists

• One server, both firewalls — OPNsense and pfSense in a mixed estate, spoken to through identical tool names. Adding a third firewall later is a new platform descriptor, not a rewrite.
• Read the whole firewall — firmware/health, interfaces & gateways, filter rules (with hit counts and state table), NAT (port-forward / outbound / 1:1), aliases, VPN (WireGuard / OpenVPN / IPsec), DHCP leases & reservations, and the firewall log.
• Flagship RCA analyses — transparent heuristics that show their numbers, never a black-box verdict: gateway_health_rca (WAN loss/latency/down → cause + action), rule_hit_and_shadow_analysis (never-hit + shadowed/redundant rules), and blocked_traffic_rca (top blocked sources/ports → scan / brute-force / probe).
• Governed writes — toggle a rule, add/remove an alias entry (reversible, undo-recorded from the fetched before-state), flush states, restart a service, and the "make it live" commit (apply_changes / reconfigure) and reboot at risk=high with a dry-run preview. Every write, reversible or not, lands an audit row.

What this tool does, and does not, decide

It delivers firewall operations — reads and writes — accurately and efficiently, and records every one of them. It does not decide whether a write is allowed to happen. That is the agent's judgement, or the permission of the account you connect it with: give the OPNsense/pfSense API user a read-only role, and the writes fail at the server — the place that actually owns the permission.

So there is no read-only switch, no policy file, no approval gate to configure. The one thing the tool guarantees is that nothing is silent: every call, over MCP and over the CLI alike, lands an audit row in ~/.firewall-aiops/audit.db, and reversible writes still capture their before-state and record an inverse where one exists.

Each tool declares a risk_level, matched to its [READ]/[WRITE]

documentation tag, and carried into the audit row as a descriptive tier — so a

reviewer can see at a glance that a row was a high-risk write. It is a label,

not a gate.

Running a smaller / local model? See agent-guardrails.md — it lists the guardrails this tool now enforces for you (so you don't spend prompt budget restating them) and gives a ready-made system prompt for what's left.

Tool inventory (35 tools)

Reversible writes record an inverse undo descriptor built from the real fetched before-state (toggle_rule restores the rule's prior enabled flag; alias add/remove invert). apply_changes / reconfigure / reboot are high-risk with dry_run; reboot is irreversible (audit only).

Install

uv tool install firewall-aiops        # or: pipx install firewall-aiops

Quick start

As a Claude Code plugin

One install gives an agent both the skill and the MCP server:

/plugin marketplace add AIops-tools/marketplace

/plugin install firewall-aiops@aiops-tools

The MCP server is fetched with uv and pinned to the package version this plugin declares, so an audit row can be traced back to the code that wrote it. Credentials are still configured with firewall-aiops init — see below.

As an OpenClaw plugin

The same bundle is published on ClawHub, where one install delivers the skill and its MCP server together:

openclaw plugins install clawhub:@zw008/firewall-aiops

openclaw skills info firewall-aiops # expect: Visible to model: yes

Restart the OpenClaw gateway afterwards so it loads the plugin. The MCP server is fetched with uv, pinned to this exact release, so uvx has to be on PATH — without it the skill still installs but reports Visible to model: no. Credentials are configured exactly as below.

As a CLI or standalone MCP server

firewall-aiops init                     # wizard: pick platform (opnsense/pfsense) + store the secret (encrypted)

firewall-aiops doctor # verify config, secrets, and connectivity firewall-aiops overview # one-shot: version + gateway/interface health + rule count firewall-aiops rules list # list filter rules firewall-aiops rules toggle --disable # dry-run + double-confirm governed write firewall-aiops log --action block -n 50 # recent blocked traffic

Run the MCP server (stdio) for an agent:

firewall-aiops mcp                      # or: firewall-aiops-mcp

MCP client config

{

"mcpServers": { "firewall-aiops": { "command": "uvx", "args": ["--from", "firewall-aiops", "firewall-aiops-mcp"], "env": { "FIREWALL_AIOPS_MASTER_PASSWORD": "your-master-password" } } } }

Configuration

~/.firewall-aiops/config.yaml (non-secret connection details only):

targets:

• name: fw1 platform: opnsense # opnsense | pfsense host: 192.0.2.1 port: 443 username: # OPNsense API key (unused for pfSense) verify_ssl: true # the default; false ONLY for self-signed lab certs
• name: edge platform: pfsense host: 192.0.2.2 verify_ssl: true

scheme: http # https is the default; http ONLY for a GUI behind a

# proxy that terminates TLS for it

The secret — the OPNsense API *secret* (paired with the key for HTTP Basic auth) or the pfSense API key — is stored encrypted in ~/.firewall-aiops/secrets.enc (Fernet + scrypt-derived key), never plaintext on disk. Set it with firewall-aiops secret set or the init wizard. The store is unlocked by a master password from FIREWALL_AIOPS_MASTER_PASSWORD (non-interactive/MCP/CI) or an interactive prompt (CLI on a TTY). A legacy plaintext env var FIREWALL_ _SECRET is honoured as a fallback (migrate with firewall-aiops secret migrate).

Governance

Every MCP tool is wrapped by @governed_tool:

• Audit — every call is logged to ~/.firewall-aiops/audit.db (tool, params with secrets redacted, status, duration, risk tier, approver, rationale).
• Budget / runaway guard — per-process token/call caps and a repeat-call circuit breaker (FIREWALL_MAX_TOOL_CALLS, FIREWALL_RUNAWAY_MAX, …).
• Risk-tier labelling — each tool's declared risk_level is recorded on its audit row as a descriptive tier (a label, not a gate); there is no read-only switch, policy file, or approval gate. FIREWALL_AUDIT_APPROVED_BY and FIREWALL_AUDIT_RATIONALE are optional audit annotations, recorded when set but never required.
• Undo recording — reversible writes record an inverse descriptor to ~/.firewall-aiops/undo.db from the fetched before-state (recording only; an external orchestrator executes it).
• Sanitisation — all firewall-returned text is bounded + injection-sanitised before it reaches the agent.

Platform support & verification status

• Platforms: OPNsense (REST API) and pfSense (REST API v2, pfSense-pkg-RESTAPI).
• Test coverage: behaviour is validated against mocked OPNsense/pfSense JSON responses — every module imports, every MCP tool carries the governance marker, the RCA heuristics are unit-tested against synthetic telemetry, and reversible writes are asserted to record the correct inverse undo descriptor. The concrete REST paths are modelled from each project's public API and have not yet been exercised against a live firewall. See docs/VERIFICATION.md for the checklist a live run must satisfy; firewall-aiops doctor (a firmware/version query on both platforms) is the fastest connectivity check. Both platforms are free and self-hostable (OPNsense is fully open-source; pfSense CE is free), so a home lab is the easiest place to run it.
• Missing a capability? Open an issue or PR at github.com/AIops-tools/Firewall-AIops — contributions and feedback welcome.

License

MIT — see LICENSE.