# pfSense MCP

Model Context Protocol server for [pfSense](https://www.pfsense.org/) firewall management via the [REST API v2 package](https://pfrest.org/) (`pfSense-pkg-RESTAPI`). Sibling project to `opnsense-mcp` with the same safety model.

## Features

- **55+ tools** covering system status, interfaces, firewall rules, aliases, NAT, DHCP, diagnostics, routing, VPN (OpenVPN/IPsec/WireGuard), and DNS resolver
- **Safety guardrails**: writes disabled by default, dry-run mode, WAN any/any rule blocking, required description prefix
- **Audit logging**: all mutations logged to JSONL
- **`apply` control**: write tools accept `apply=true` to apply immediately, or batch changes and call the apply tool

## Prerequisites

pfSense does not ship a REST API. Install the free **REST API v2 package** on the firewall first:

```sh
# On the pfSense shell (adjust version to your pfSense release — see pfrest.org)
pkg-static add https://github.com/jaredhendrickson13/pfsense-api/releases/latest/download/pfSense-2.8.0-pkg-RESTAPI.pkg
```

Then in the web UI: **System → REST API → Settings** (enable), and **System → REST API → Keys** to generate an API key.

## Quick Start

### 1. Install

```bash
pip install -e /path/to/pfsense-mcp
```

Or with the Hermes venv:

```bash
/usr/local/lib/hermes-agent/venv/bin/pip install -e /root/projects/pfsense-mcp
```

### 2. Configure environment

```bash
cp .env.example .env
```

| Variable | Default | Description |
|----------|---------|-------------|
| `PFSENSE_URL` | `https://192.168.1.1` | Firewall base URL |
| `PFSENSE_API_KEY` | — | REST API key (preferred) |
| `PFSENSE_USERNAME` / `PFSENSE_PASSWORD` | — | Basic auth fallback |
| `PFSENSE_VERIFY_SSL` | `false` | Verify TLS certificate |
| `PFSENSE_ALLOW_WRITES` | `false` | Enable mutating operations |
| `PFSENSE_DRY_RUN` | `false` | Log writes without executing |
| `PFSENSE_REQUIRE_DESCRIPTION_PREFIX` | `mcp:` | Prefix for new firewall rules (`descr`) |
| `PFSENSE_BLOCK_WAN_INBOUND_ANY` | `true` | Block WAN any→any pass rules |

### 3. Register with Hermes

```yaml
mcp_servers:
  pfsense:
    command: /usr/local/lib/hermes-agent/venv/bin/pfsense-mcp
    timeout: 120
    enabled: true
    env:
      PFSENSE_URL: "https://your-pfsense"
      PFSENSE_API_KEY: "your-api-key"
      PFSENSE_VERIFY_SSL: "false"
      PFSENSE_ALLOW_WRITES: "false"
```

Then `hermes mcp test pfsense` and `hermes gateway restart`.

### 4. Register with Cursor (`~/.cursor/mcp.json`)

```json
{
  "mcpServers": {
    "pfsense": {
      "command": "pfsense-mcp",
      "env": {
        "PFSENSE_URL": "https://your-pfsense",
        "PFSENSE_API_KEY": "your-api-key"
      }
    }
  }
}
```

## Tool Categories

### Read-only (always available with valid credentials)

| Tool | Description |
|------|-------------|
| `pfsense_test_connection` | Verify API auth and connectivity |
| `pfsense_get_system_status` | CPU, memory, disk, uptime |
| `pfsense_get_interface_status` | Live interface status |
| `pfsense_list_firewall_rules` | Filter rules (with query filters) |
| `pfsense_list_firewall_states` | Active state table |
| `pfsense_list_aliases` | Firewall aliases |
| `pfsense_list_port_forwards` | Destination NAT rules |
| `pfsense_list_dhcp_leases` | DHCP lease table |
| `pfsense_get_arp_table` | ARP / IP→MAC |
| `pfsense_get_gateway_status` | Gateway health |
| `pfsense_get_firewall_log` | Firewall log |
| `pfsense_get_openvpn_status` | OpenVPN connected clients |
| `pfsense_get_ipsec_status` | IPsec SAs |
| `pfsense_list_wireguard_tunnels` | WireGuard (plugin) |
| `pfsense_list_dns_host_overrides` | Local DNS records |
| `pfsense_get_config_history` | Config change audit trail |

### Write operations (require `PFSENSE_ALLOW_WRITES=true`)

| Tool | Description |
|------|-------------|
| `pfsense_add_firewall_rule` | Add filter rule (descr prefix required) |
| `pfsense_toggle_firewall_rule` | Enable/disable rule |
| `pfsense_apply_firewall` | Apply pending changes |
| `pfsense_add_alias` / `pfsense_update_alias` | Manage aliases |
| `pfsense_add_port_forward` | Add destination NAT |
| `pfsense_add_dhcp_static_mapping` | DHCP reservation |
| `pfsense_add_dns_host_override` | Local DNS record |
| `pfsense_add_static_route` | Static route |
| `pfsense_service_action` | Start/stop/restart services |
| `pfsense_kill_firewall_states` | Kill states by source |
| `pfsense_reboot` | Reboot (double confirm) |

### Query filtering

List tools accept a `query` parameter with pfSense REST v2 query syntax:

```text
query="interface=wan"                 exact match
query="descr__contains=mcp"           substring
query="ip__startswith=10.77"          prefix
query="interface=wan,protocol=tcp"    multiple conditions
```

## Differences vs opnsense-mcp

| Aspect | OPNsense | pfSense |
|--------|----------|---------|
| API | Built-in (`/api/module/controller/command`) | Package required (`/api/v2/...`) |
| Auth | key+secret basic auth | `X-API-Key` header or basic auth |
| IDs | UUIDs | Numeric ids (positional) |
| Apply | Savepoint + rollback workflow | `apply=true` param or apply endpoints |
| Rule description field | `description` | `descr` |

## Security Notes

- Never commit API keys; use environment variables or Hermes secrets.
- Start read-only (`PFSENSE_ALLOW_WRITES=false`).
- Create a dedicated pfSense user + API key with minimal privileges.
- Review the audit log at `PFSENSE_AUDIT_LOG_PATH`.
- pfSense numeric ids shift when objects are deleted — always list immediately before mutating by id.

## License

MIT