keychaincredential_generate_ssh_key

THE RISK

Medium Risk

Why keychaincredential_generate_ssh_key needs a policy

This tool creates and stores new cryptographic credentials (SSH keys) in the TrueNAS keychain. While generation is reversible (keys can be deleted), it modifies system state by adding authentication material. This is a Write operation rather than Execute because it performs a standard credential generation function without executing arbitrary code.

From the tool's definition Tool generates (creates) new SSH key pair artifacts in the system keychain. Description states 'Generate a new SSH key pair' which is a creation/write operation that adds cryptographic credentials to the system.

Documented attack patterns abuse exactly the kind of access keychaincredential_generate_ssh_key gives an agent:

POLICY

How to control keychaincredential_generate_ssh_key

PolicyLayer is an MCP gateway — it sits between your AI agents and Truenas, and nothing reaches the server without passing your rules. This is the rule we recommend for keychaincredential_generate_ssh_key:

policy.json

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

keychaincredential_generate_ssh_key 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.

Create a free account and register Truenas — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about keychaincredential_generate_ssh_key

What does the keychaincredential_generate_ssh_key tool do? +

Generate a new SSH key pair. It is categorised as a Write tool in the Truenas MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on keychaincredential_generate_ssh_key? +

Register the Truenas MCP server in PolicyLayer and add a rule for keychaincredential_generate_ssh_key: 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 Truenas. Nothing to install.

What risk level is keychaincredential_generate_ssh_key? +

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

Can I rate-limit keychaincredential_generate_ssh_key? +

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

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

keychaincredential_generate_ssh_key is provided by the Truenas MCP server (spranab/truenas-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Truenas tool call.

Start from Truenas, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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