List firewall alias definitions (IP lists, port groups, GeoIP, URLs).
AI agents call opn_list_firewall_aliases to retrieve information from OPNsense MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries firewall alias configuration data without creating, modifying, deleting, or executing any operations. It has no side effects and returns informational data only. The blast radius of misuse is minimal, as an AI agent listing existing aliases cannot cause harm or gain unauthorized access to systems beyond information disclosure, which is inherent to a read operation.
From the tool's definition Tool name contains 'list' and description states it 'List[s] firewall alias definitions' with no modification or execution capability mentioned. Lists IP lists, port groups, GeoIP, and URLs—all read-only operations.
Documented attack patterns abuse exactly the kind of access opn_list_firewall_aliases gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and OPNsense MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for opn_list_firewall_aliases:
{
"version": "1",
"default": "deny",
"tools": {
"opn_list_firewall_aliases": {}
}
}opn_list_firewall_aliases is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
List firewall alias definitions (IP lists, port groups, GeoIP, URLs). It is categorised as a Read tool in the OPNsense MCP Server MCP Server, which means it retrieves data without modifying state.
Register the OPNsense MCP Server MCP server in PolicyLayer and add a rule for opn_list_firewall_aliases: 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 OPNsense MCP Server. Nothing to install.
opn_list_firewall_aliases is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the opn_list_firewall_aliases 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.
Set action: deny in the PolicyLayer policy for opn_list_firewall_aliases. 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.
opn_list_firewall_aliases is provided by the OPNsense MCP Server MCP server (lucamarien/opnsense-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from OPNsense MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
81 OPNsense MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.