Yubikey Two Factor 1.0.1

This refers to a specific version of an add-on for the XenForo 1 forum software that adds Two-Factor Authentication (2FA) using YubiKey hardware security keys.

1. What is this Add-on?​

  • XenForo 1: The forum software platform (version 1.x series, which is now outdated).
  • Two Factor: The category of the add-on, which enhances login security.
  • Yubikey: The specific type of 2FA it implements. YubiKeys are physical USB (or NFC) devices that generate one-time passwords.
  • Version 1.0.1: The specific version of this add-on. This is an early release and is considered very old.

2. Key Features (What it does)​

When this add-on is installed and enabled on a XenForo 1 forum, it allows users (and/or administrators) to:

  1. Register their YubiKey: Link their physical YubiKey to their forum account in the security settings.
  2. 2FA Challenge: After entering their correct username and password, they will be prompted to press the button on their YubiKey.
  3. Secure Login: The YubiKey generates a one-time password (OTP) which is sent to the forum. If it matches, access is granted.
This provides a very high level of security, as an attacker would need to both know the password and possess the physical YubiKey to log in.

3. Important Warnings & Critical Information​

Warning #1: XenForo 1 is End-of-Life (EOL)​

XenForo 1.x is no longer supported, maintained, or receiving security updates by XenForo Ltd. Running a forum on an EOL platform is a major security risk. It likely has unpatched vulnerabilities that can be exploited.

Warning #2: The Add-on is Likely Incompatible and Unsupported​

An add-on of version 1.0.1 is ancient. It was almost certainly built for an early version of XenForo 1. It will most likely:

  • Not work correctly with the final versions of XenForo 1.5.x.
  • Cause errors or break parts of your forum.
  • Have its own unpatched security vulnerabilities.
  • Have no available support from the original developer.

4. The Modern Solution: Upgrading​

The only recommended course of action is to upgrade your entire forum.

  1. Upgrade to XenForo 2: Purchase a XenForo 2 license and migrate your forum from XF1 to XF2. This is a standard process with official importers.
  2. Use Native Yubikey/2FA in XenForo 2: The excellent news is that XenForo 2 has built-in, robust Two-Factor Authentication support, including YubiKey (OATH).
You do not need a separate add-on for YubiKey in XenForo 2. The functionality is core to the software.

How to use YubiKey in XenForo 2:

  • Go to your account -> Security & privacy -> Two-step verification.
  • You can set up multiple methods: Authenticator app (TOTP), Email, and Security keys (which includes FIDO2 and YubiKey OTP).
  • Users can register their YubiKeys here seamlessly.

5. If You Insist on Using XF1 and this Add-on​

This is highly discouraged for production sites. Only consider this for a test/development environment.

  1. Source the File: You would need to find the YubikeyTwoFactor-1.0.1.zip (or similar) file. It's no longer available on official channels, so you'd be relying on third-party archives, which is a security risk in itself.
  2. Installation:
    • Log in to your XenForo 1 Admin Control Panel (ACP).
    • Go to Add-ons -> Install Add-on.
    • Upload the ZIP file.
  3. Configuration:
    • After installation, go to Options -> Options -> Yubikey Two Factor.
    • You will need a Client ID and a Secret Key from the Yubico API. This is required for the add-on to validate the OTPs with Yubico's servers.
    • Configure which user groups are required or allowed to use it.

Conclusion​

Do not use "Yubikey Two Factor 1.0.1" on a live XenForo 1 forum. The combination of an outdated forum platform and an outdated security add-on creates an extremely vulnerable system.

The correct and secure path is to upgrade your forum to XenForo 2 and utilize its modern, built-in two-factor authentication system, which includes full support for YubiKeys and other security standards.
 

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