Unable to point to ssh keys in ~/.ssh on Jenkins host

Question

I've installed SSH Agent Plugin to pull Git repository using SSH authentication. I'd like to use SSH keys located in system file (from the Jenkins master ~/.ssh option). It's screenshot taken from official plugin's page:

Unfortunately I don't see this option. I can select only "Enter directly". Please check out my screenshot.

Did I configure something wrong?

Answer 1

This is a reletively recent change, explained in security advisory 440 : https://jenkins.io/security/advisory/2018-06-25/

SECURITY-440 / CVE-2018-1000601 SSH Credentials Plugin allowed the creation of SSH credentials with keys "From a file on Jenkins master". Credentials Binding Plugin 1.13 and newer allows binding SSH credentials to environment variables. In combination, these two features allow users with the permission to configure a job to read arbitrary files on the Jenkins master by creating an SSH credential referencing an arbitrary file on the Jenkins master, and binding it to an environment variable in a job.

SSH Credentials Plugin no longer supports SSH credentials from files on the Jenkins master file system, neither user-specified file paths nor ~/.ssh. Existing SSH credentials of these kinds are migrated to "directly entered" SSH credentials.