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Summary

Passwords alone are no longer sufficient. To address this RIT has moved to Duo's MFA service for the majority of services. Admins and developers, however, have access to large amounts of information and have privileges on servers that can cause significant damage if their credentials are compromised. Because of those risks, stronger and more efficient MFA is required for certain accounts. To achieve this, ITS has historically used OATH (One Time Passwords) for SSH and sudo access on linux servers and recently started requiring either certificates + PIN or Duo for Windows logons.

OATH is deprecated and all OATH users are being moved to certificate-based authentication. ITS is issuing YubKeys that will be used to securely generate and store these certificates.

Requirements

• YubiKey 4.3 or later (Typically this is a YubiKey 4 or newer)
• Latest version of OS
• Yubikey Manager
  • Download direct from Yubico: https://www.yubico.com/support/download/yubikey-manager/#h-downloads
  • Windows
    • https://developers.yubico.com/yubikey-manager-qt/Releases/yubikey-manager-qt-latest-win64.exe

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      title SCCM Software Center

      
      

  • Mac
    • https://developers.yubico.com/yubikey-manager-qt/Releases/yubikey-manager-qt-latest-mac.pkg
  • Linux
    • AppImage - https://developers.yubico.com/yubikey-manager-qt/Releases/yubikey-manager-qt-latest-linux.AppImage
    • Src - https://developers.yubico.com/yubikey-manager-qt/Releases/yubikey-manager-qt-latest.tar.gz

Considerations

• These docs are not the only way to accomplish the goal nor are YubiKeys required however the further you deviate from these docs the less knowledge ITS has to assist you.
• The OS requires a lock on the YubiKey. If using multiple computers, even if a computer is virtual, multiple devices will be needed – one device per instance of the OS.
  • A YubiKey can be passed through RDP session(s)
• Each device will have a different certificate. A certificate can, however, be used for access to both Linux and Windows servers.
• Expert mode: While a YubiKey (i.e. a Yubico device) is not required the docs and process are built assuming a Yubikey is being used. Any device that can securely generate and store keys in a way that can be cryptographically verified will work.

Process Overview

1. Initialize/Configure Yubikey
2. Which Certificate Is Right For Me?
3. Generate certificate
4. Submit certificate for verification
5. Configure clients to use certificates

Initialize/Configure Yubikey

Which Certificate Is Right For Me?

If you primarily log into and work mainly with Windows machines, please follow the process below:

Else, follow this process below:

Submit certificate for verification

Configure clients to use certificates

Other uses of Yubikeys

• Register the YubiKey as a security key within Duo by enrolling the device at start.rit.edu/Duo
• Configure the YubiKey as a safe place to store OTP (one time passcodes) for non-RIT services instead of using a phone app
• Register the Yubikey to provide passwordless authentication in Azure/M365 services

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Generating and distributing(?) certificates

Windows

Enroll certificates using the following Guide:

• Yubikey Smartcard Setup via Windows CA-issued Certificate (Yubikey Manager) - ITS Operations - RIT Wiki

Configure Windows to automatically load certificates from the Yubikey for SSH use:

• Yubikey Windows SSH Agent Configuration - ITS Operations - RIT Wiki

macOS

Linux

Using certificates