Managing SSH Client Public Keys

You can import SSH client public keys to establish an authenticated log in to the device from an external ssh client. You can also delete the key from the device to prevent it from being used for an authenticated log in.

To manage the SSH client public keys, perform the following steps.

Import an SSH client public key to the device.
```
device# certutil import sshkey directory /root/.ssh/ file id_rsa.pub 
host 10.20.238.152 login root password pass protocol SCP user admin
```
This example imports the SSH client public key for the admin user from the remote 10.20.238.152 host using the directory and file information for the key and using SCP log-in credentials.
You can also copy the public key directly. For example:
```
device# certutil sshkey user admin pubkey “ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQ
Dnim+Ofjx/id3z2jDxXu9DcMuQqVq/NKi2Lms+q7dA5Dqww8jlrOGawG8tMySOvnB1ZEvJt1kqNneRi4l6Ot4/7hfd
99rIOPGBP/NJs6xTLUrQhDgxB78ddTg+6euBtkYLTAaTC7kbXGXcO8VVB9+4xrH+0bkvjU9RRvGJguUfdiFKEfIGVOy
t0atdHi1dmgQ9BE0cO65nc/i9MjMJedBe174/QT4TxeGeEgaQ57c2AL5It2V4CzrZBDtnixdnHUO5w2vmBR61LZIDVT1
fuX/xYxDAm9H8SDpDX8pZlfFpQBy/wrkIYPZ/p4OLrUApB/XAJGujrlNlZLEu9U9MPVM/ root@ldap.hc-fusion.in”
```
After the public key is imported or copied for a user, password-based authentication becomes a fallback option for that particular user. This user can log in using the public key. If a user tries to log in from a device on which the public key is not present, then the user is prompted for a password. When the public key is removed for the user, only password-based authentication is enabled for that particular user.

Note
When the public key is imported or removed, the SSH server is automatically rebooted and all active SSH connections are terminated.

Enter the password for the user.

Password: ***********

When the SSH key is imported, the following message is displayed.

device# 2019/01/14-10:28:58, [SEC-3050], 75, INFO, SLX9540, 
Event: sshutil, Status: success, Info: Imported SSH public key from 10.70.4.106 for user 'admin'.

Delete an SSH public key from the device.
This action resets the device to a password-based login.
```
device# no certutil sshkey user admin
```
This example deletes the SSH client key for the admin user.
Note
When the public key is imported or removed, the SSH server is automatically rebooted and all active SSH connections are terminated.