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Created: 2022-06-25 | Last update: 2022-06-25

UDM Persistent SSH Keys

UDM will discard any Authorized Keys for SSH every reboot or firmware upgrade. This script will allow you to persist your SSH keys in the UDM and survive reboots.

Github Repository: UDM Persistent SSH Keys

Persistence on Reboot

This script need to run every time the system is rebooted since the /root/.ssh/authorized_keys overwrites every boot.
This can be accomplished with a boot script. Flow this guide: UDM / UDMPro Boot Script

Compatibility

  • Tested on UDM PRO
  • UDM Pro doesn't support ed25519 SSH Keys

Installation

The script was tested on UDM PRO

curl https://raw.githubusercontent.com/fire1ce/UDM-Persistent-SSH-Keys/main/install.sh | sh

Add you public RSA keys to:

/mnt/data/ssh/authorized_keys

Uninstall

Delete the 99-ssh-keys.sh file

rm -rf /mnt/data/on_boot.d/99-ssh-keys.sh

Delete your authorized_keys file

rm -rf /mnt/data/ssh/authorized_keys

Usage

At boot the script with read the /mnt/data/ssh/authorized_keys file and add the content to UDM's /root/.ssh/authorized_keys

Manual run:

/mnt/data/on_boot.d/99-ssh-keys.sh

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