CService

The `CService` ZNC module provides secure login functionality for X on UnderNet, including support for 2FA/TOTP authentication and LoC (Login on Connect). It allows users to configure login details, enable/disable 2FA, and specify user modes. Sensitive data, such as passwords and 2FA secrets, are encrypted using AES-256 encryption for enhanced security.

Features

1. **Secure Login**: Authenticate securely with UnderNet using your username, password, and optional TOTP-based 2FA.
2. **2FA/TOTP Support**: Enhance security by adding time-based one-time passwords to your login process.
3. **LoC (Login on Connect)**: Seamlessly log in to UnderNet using their LoC feature. Learn more: [UnderNet LoC](https://www.undernet.org/loc/).
4. **Custom User Modes**: Set your preferred user mode prefix (`-x!`, `+x!`, or `-!+x`) during server connection.
5. **Encrypted Credentials**: Protect your password and 2FA secret with AES-256 encryption, ensuring that sensitive data is stored securely.
   
   

Installation

1. Clone the repository:

git clone https://github.com/your-repository/cservice-znc-module.git  
cd cservice-znc-module

2. Generate your `MASTER_KEY` for encrypting sensitive data (password and 2FA secret):

openssl rand -hex 32

Replace the placeholder `MASTER_KEY` in the module code with the generated key:

const std::string MASTER_KEY = "REPLACE_WITH_YOUR_OWN_SECURE_KEY";

3. Build the module:

znc-buildmod cservice.cpp

4. Place the compiled module in your ZNC modules directory:

mv cservice.so ~/.znc/modules/

5. Load the module in ZNC:

/znc loadmod cservice

Configuration

After loading the module, run the following command for help and configuration options:

/msg *cservice help

You can set:
- Your UnderNet username and password.
- Your 2FA secret for TOTP.
- Enable or disable 2FA.
- Your preferred user mode (`-x!`, `+x!`, or `-!+x`)

Formatting the 2FA Secret Key

The CService website provides the 2FA secret key in eight groups separated by spaces, like this:

a1b2 c3d4 e5f6 g7h8 i9j0 k1l2 m3n4 o5p6

Before entering the key into the module, you must:
1. Remove all spaces.
2. Convert all lowercase letters to uppercase.

For example, if CService gives you `a1b2 c3d4 e5f6 g7h8 i9j0 k1l2 m3n4 o5p6`, you should enter it as:

A1B2C3D4E5F6G7H8I9J0K1L2M3N4O5P6

This ensures compatibility with the module.

You can use the following Linux command to reformat the key automatically:

echo "a1b2 c3d4 e5f6 g7h8 i9j0 k1l2 m3n4 o5p6" | tr -d ' ' | tr '[:lower:]' '[:upper:]'

Password and 2FA Encryption

This module encrypts sensitive data (password and 2FA secret) using AES-256 encryption. Each user must generate their own encryption key (referred to as `MASTER_KEY`) and update the module code before building it.

Generating a Secure Encryption Key

To generate a secure 256-bit (32-byte) hexadecimal key, use the following OpenSSL command:

openssl rand -hex 32

Replace the placeholder `MASTER_KEY` in the module code with the generated key:

const std::string MASTER_KEY = "REPLACE_WITH_YOUR_OWN_SECURE_KEY";

Notes

• **Security Warning**: Always keep your `MASTER_KEY` private. If the key is exposed, encrypted data can be compromised. If the `MASTER_KEY` is lost, the encrypted password and 2FA secret will no longer work, and you will have to reconfigure the module.
  
• For changes to take effect, reload the module after updating configuration or code:

/znc unloadmod cservice  
/znc loadmod cservice

See Also

For more information on UnderNet's Login on Connect (LoC) feature, visit UnderNet LoC.

Enjoy secure and seamless logins with the `CService` ZNC module!