Nola Tool — Run_command

The workflow JSON

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{
  "name": "nola tool \u2014 run_command",
  "nodes": [
    {
      "parameters": {},
      "id": "workflow-trigger",
      "name": "Execute Workflow Trigger",
      "type": "n8n-nodes-base.executeWorkflowTrigger",
      "typeVersion": 1,
      "position": [
        220,
        300
      ]
    },
    {
      "parameters": {
        "jsCode": "// Safety check: validate host and command before SSH\nconst allowedHosts = (process.env.SSH_ALLOWED_HOSTS || '').split(',').map(h => h.trim().toLowerCase()).filter(Boolean);\nconst host = ($input.first().json.host || '').trim().toLowerCase();\nconst command = ($input.first().json.command || '').trim();\n\n// Blocked command patterns \u2014 destructive or dangerous operations\nconst blockedPatterns = [\n  /rm\\s+-rf/i,\n  /mkfs/i,\n  /dd\\s+if/i,\n  /:\\(\\)/,           // fork bomb\n  />\\s*\\/dev\\/sd/i,  // disk overwrite\n  /shutdown/i,\n  /reboot/i,\n  /halt/i,\n  /poweroff/i,\n  /passwd/i,\n  /userdel/i,\n  /chmod\\s+777/i,\n  /curl.*\\|.*sh/i,   // curl pipe to shell\n  /wget.*\\|.*sh/i,\n];\n\nif (!host) throw new Error('run_command: no host specified');\nif (!command) throw new Error('run_command: no command specified');\nif (!allowedHosts.includes(host)) {\n  throw new Error(`run_command: host '${host}' is not in SSH_ALLOWED_HOSTS (${allowedHosts.join(', ')})`);\n}\nfor (const pattern of blockedPatterns) {\n  if (pattern.test(command)) {\n    throw new Error(`run_command: command blocked by safety filter: ${command}`);\n  }\n}\n\nreturn [{ json: { host, command } }];"
      },
      "id": "safety-check",
      "name": "Safety Check",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [
        440,
        300
      ]
    },
    {
      "parameters": {
        "jsCode": "// Resolve SSH connection details from env vars\nconst host = $input.first().json.host.toUpperCase();\nconst sshHost = process.env[`SSH_HOST_${host}`];\nconst sshUser = process.env[`SSH_USER_${host}`];\nconst sshKey  = process.env[`SSH_KEY_${host}`];\n\nif (!sshHost) throw new Error(`run_command: SSH_HOST_${host} not set in environment`);\nif (!sshUser) throw new Error(`run_command: SSH_USER_${host} not set in environment`);\n\nreturn [{ json: {\n  host: $input.first().json.host,\n  command: $input.first().json.command,\n  sshHost,\n  sshUser,\n  sshKey: sshKey || null\n} }];"
      },
      "id": "resolve-connection",
      "name": "Resolve SSH Connection",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [
        660,
        300
      ]
    },
    {
      "parameters": {
        "authentication": "privateKey",
        "host": "={{ $json.sshHost }}",
        "port": 22,
        "username": "={{ $json.sshUser }}",
        "privateKey": "={{ $json.sshKey }}",
        "command": "={{ $json.command }}",
        "options": {
          "executeCommandAs": "={{ $json.sshUser }}"
        }
      },
      "id": "ssh-execute",
      "name": "SSH Execute",
      "type": "n8n-nodes-base.ssh",
      "typeVersion": 1,
      "position": [
        880,
        300
      ]
    },
    {
      "parameters": {
        "jsCode": "const result = $input.first().json;\nconst stdout = result.stdout || '';\nconst stderr = result.stderr || '';\nconst exitCode = result.code ?? 0;\n\nlet output = stdout.trim();\nif (stderr.trim()) output += (output ? '\\n' : '') + `STDERR: ${stderr.trim()}`;\nif (exitCode !== 0) output += `\\nExit code: ${exitCode}`;\n\nreturn [{ json: { output: output || '(no output)' } }];"
      },
      "id": "format-output",
      "name": "Format Output",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [
        1100,
        300
      ]
    }
  ],
  "connections": {
    "Execute Workflow Trigger": {
      "main": [
        [
          {
            "node": "Safety Check",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Safety Check": {
      "main": [
        [
          {
            "node": "Resolve SSH Connection",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Resolve SSH Connection": {
      "main": [
        [
          {
            "node": "SSH Execute",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "SSH Execute": {
      "main": [
        [
          {
            "node": "Format Output",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "active": false,
  "settings": {
    "executionOrder": "v1"
  },
  "tags": [
    "nola",
    "tool"
  ]
}

About this workflow

nola tool — run_command. Uses executeWorkflowTrigger, ssh. Event-driven trigger; 5 nodes.

Source: https://github.com/iamgadgetman/nola/blob/main/workflows/tool-run-command.json — original creator credit. Request a take-down →

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