John The Ripper

A Model Context Protocol (MCP) server that provides AI assistants with access to John the Ripper, the legendary password security auditing and recovery tool. This server executes commands on a remote Kali Linux system via SSH, enabling secure password analysis workflows.

Features

• Password Cracking - Multiple attack modes: wordlist, incremental, single crack, and rules-based
• Hash Management - Show cracked passwords, manage pot files, identify hash types
• Session Control - Create, monitor, restore, and terminate cracking sessions
• Hash Extraction - Extract hashes from encrypted files (ZIP, PDF, SSH keys, Office docs, etc.)
• Benchmarking - Test cracking performance for different hash formats
• Rules Engine - List and test password mangling rules

Installation

# Clone the repository
git clone https://github.com/schwarztim/sec-john-the-ripper-mcp.git
cd sec-john-the-ripper-mcp

# Install dependencies
npm install

# Build
npm run build

Configuration

The server connects to a remote Kali Linux system via SSH. Configure via environment variables:

Variable	Description	Default
JOHN_SSH_HOST	SSH hostname or IP of Kali system	kali
JOHN_SSH_USER	SSH username (optional)	(none)
JOHN_PATH	Path to john binary on remote system	john
JOHN_WORK_DIR	Remote working directory for temp files	/tmp/john-mcp

Prerequisites

1. SSH Access - Passwordless SSH key authentication to your Kali system
2. John the Ripper - Installed on the remote Kali system (apt install john)
3. Node.js - Version 18+ recommended

Claude Desktop Configuration

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "john-the-ripper": {
      "command": "node",
      "args": ["/path/to/sec-john-the-ripper-mcp/dist/index.js"],
      "env": {
        "JOHN_SSH_HOST": "your-kali-host",
        "JOHN_SSH_USER": "kali"
      }
    }
  }
}

Available Tools

Cracking Operations

Tool	Description
john_crack	Start password cracking with configurable modes and options
john_show	Display cracked passwords from hash files
john_status	Check the status of running sessions
john_restore	Resume an interrupted cracking session
john_sessions	List all active and saved sessions
john_kill	Terminate running John processes

Hash Analysis

Tool	Description
john_identify	Identify hash type(s) for given values
john_formats	List supported hash formats with optional filtering
john_hash_extract	Extract hashes from encrypted files using *2john utilities

Configuration & Testing

Tool	Description
john_rules	List available rules or test rules against sample words
john_benchmark	Run performance benchmarks for hash formats
john_pot	Manage the john.pot file (show, clear, export, search)

Usage Examples

Crack MD5 Hashes with Wordlist

Use john_crack with:
- hash_content: "5f4dcc3b5aa765d61d8327deb882cf99"
- format: "raw-md5"
- wordlist: "/usr/share/wordlists/rockyou.txt"

Identify Unknown Hash

Use john_identify with:
- hash: "$2a$10$N9qo8uLOickgx2ZMRZoMy..."

Extract Hash from ZIP File

Use john_hash_extract with:
- type: "zip"
- file_path: "/path/to/encrypted.zip"

Check Cracking Progress

Use john_status with:
- session: "my-crack-session"

Supported Hash Extraction Types

• zip - ZIP archives
• rar - RAR archives
• pdf - PDF documents
• ssh - SSH private keys
• gpg - GPG/PGP keys
• office - Microsoft Office documents
• keepass - KeePass databases
• 7z - 7-Zip archives
• bitlocker - BitLocker volumes
• luks - LUKS encrypted volumes
• truecrypt / veracrypt - TrueCrypt/VeraCrypt volumes
• ethereum / bitcoin - Cryptocurrency wallets

Security Considerations

This tool is intended for authorized security testing only. Ensure you have proper authorization before:

• Testing password strength on systems you own or administer
• Conducting penetration tests with written permission
• Recovering passwords for files you have legitimate access to

Unauthorized password cracking is illegal. Always follow your organization's security policies and applicable laws.

License

MIT License - See LICENSE for details.

Contributing

Contributions welcome! Please open an issue or submit a pull request.

Credits

• John the Ripper by Openwall
• Built with the Model Context Protocol SDK