pg_security_firewall_rules

List detailed pg_hba.conf authentication rules with optional filtering by user or rule type.

SERVERPostgreSQL MCP Server SOURCE@neverinfamous/postgres-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-neverinfamous-postgres-mcp/pg-security-firewall-rules.md

WHAT IT DOES

What pg_security_firewall_rules does on PostgreSQL MCP Server

AI agents call pg_security_firewall_rules to retrieve information from PostgreSQL MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why pg_security_firewall_rules is rated Low

This tool retrieves and displays authentication configuration data without side effects. While the data exposed (authentication rules, user access patterns) is sensitive and could inform attack planning if misused by a compromised agent, the tool itself performs no state changes.

From the tool's definition Tool description states 'List detailed pg_hba.conf authentication rules' — pg_hba.conf is PostgreSQL's host-based authentication configuration file.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pg_security_firewall_rules safely

PolicyLayer is an MCP gateway: it sits between your AI agents and PostgreSQL MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For pg_security_firewall_rules, this is the rule to start with:

pg_security_firewall_rules Allowed

pg_security_firewall_rules is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "pg_security_firewall_rules": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect PostgreSQL MCP Server, apply this rule, and every pg_security_firewall_rules call is checked against it from then on.

FAQ

Questions about pg_security_firewall_rules

What does the pg_security_firewall_rules tool do? +

List detailed pg_hba.conf authentication rules with optional filtering by user or rule type. It is categorised as a Read tool in the PostgreSQL MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on pg_security_firewall_rules? +

Register the PostgreSQL MCP Server MCP server in PolicyLayer and add a rule for pg_security_firewall_rules: 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 PostgreSQL MCP Server. Nothing to install.

What risk level is pg_security_firewall_rules? +

pg_security_firewall_rules is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit pg_security_firewall_rules? +

Yes. Add a rate_limit block to the pg_security_firewall_rules 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 pg_security_firewall_rules completely? +

Set action: deny in the PolicyLayer policy for pg_security_firewall_rules. 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 pg_security_firewall_rules? +

pg_security_firewall_rules is provided by the PostgreSQL MCP Server MCP server (@neverinfamous/postgres-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

What pg_security_firewall_rules does on PostgreSQL MCP Server

Why pg_security_firewall_rules is rated Low

The rule that runs pg_security_firewall_rules safely

Questions about pg_security_firewall_rules

More on PostgreSQL MCP Server, and thousands of servers like it.