pfsense_replace_services_dns_resolver_host_overrides

WHAT IT DOES

What pfsense_replace_services_dns_resolver_host_overrides does on Pfsense

AI agents use pfsense_replace_services_dns_resolver_host_overrides to create or update resources in Pfsense — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Pfsense environment.

WHY IT NEEDS A POLICY

Why pfsense_replace_services_dns_resolver_host_overrides needs a policy

This tool modifies DNS resolver host overrides on a pfSense firewall, which can redirect DNS queries for arbitrary domains to specified IP addresses. While reversible via subsequent PUT or DELETE operations, this is a significant configuration change that affects network traffic for all clients relying on this DNS resolver.

From the tool's definition PUT /api/v2/services/dns_resolver/host_overrides — HTTP PUT method indicates modification of DNS resolver host override entries. The tool description explicitly uses PUT, which creates or overwrites existing DNS host override configurations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

pfsense_replace_services_dns_resolver_host_overrides Rate-limited

pfsense_replace_services_dns_resolver_host_overrides stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "pfsense_replace_services_dns_resolver_host_overrides": {
      "limits": [
        {
          "counter": "pfsense_replace_services_dns_resolver_host_overrides_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Pfsense, so you can run agents against it safely.

FAQ

Questions about pfsense_replace_services_dns_resolver_host_overrides

What does the pfsense_replace_services_dns_resolver_host_overrides tool do? +

PUT /api/v2/services/dns_resolver/host_overrides. It is categorised as a Write tool in the Pfsense MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on pfsense_replace_services_dns_resolver_host_overrides? +

Register the Pfsense MCP server in PolicyLayer and add a rule for pfsense_replace_services_dns_resolver_host_overrides: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Pfsense. Nothing to install.

What risk level is pfsense_replace_services_dns_resolver_host_overrides? +

pfsense_replace_services_dns_resolver_host_overrides is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit pfsense_replace_services_dns_resolver_host_overrides? +

Yes. Add a rate_limit block to the pfsense_replace_services_dns_resolver_host_overrides rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block pfsense_replace_services_dns_resolver_host_overrides completely? +

Set action: deny in the PolicyLayer policy for pfsense_replace_services_dns_resolver_host_overrides. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides pfsense_replace_services_dns_resolver_host_overrides? +

pfsense_replace_services_dns_resolver_host_overrides is provided by the Pfsense MCP server (abl030/pfsense-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.