ssh_config_update

Update SSH service configuration. All fields are optional — only provide the ones you want to change. Restart the SSH service after changes.

SERVERTruenas SOURCEspranab/truenas-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/spranab-truenas-mcp/ssh-config-update.md

WHAT IT DOES

What ssh_config_update does on Truenas

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

RISK

Why ssh_config_update is rated Medium

The tool modifies system configuration (SSH settings) and triggers a service restart, which are reversible write operations. However, misconfiguration of SSH could disable remote access entirely, leading to loss of system administration capability—hence 'high' severity.

From the tool's definition Tool description states 'Update SSH service configuration' and 'Restart the SSH service after changes'. These are modification and service restart operations.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs ssh_config_update safely

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

ssh_config_update Rate-limited

ssh_config_update 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": {
    "ssh_config_update": {
      "limits": [
        {
          "counter": "ssh_config_update_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about ssh_config_update

What does the ssh_config_update tool do? +

Update SSH service configuration. All fields are optional — only provide the ones you want to change. Restart the SSH service after changes. 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 ssh_config_update? +

Register the Truenas MCP server in PolicyLayer and add a rule for ssh_config_update: 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 ssh_config_update? +

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

Can I rate-limit ssh_config_update? +

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

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

ssh_config_update 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.

KEEP EXPLORING

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aroflo_create_or_update_record on AroFlo MCP →team_manager_update_budget on Team Manager MCP → The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →