6.4. Configuring SSH access using smart card authentication

Procedure

1. Create a new directory for SSH keys in the home directory of the user who uses smart card authentication:

   # mkdir /home/<example_user>/.ssh

2. Run the ssh-keygen -D command with the opensc library to retrieve the existing public key paired with the private key on the smart card, and add it to the authorized_keys list of the user’s SSH keys directory to enable SSH access with smart card authentication.

   # ssh-keygen -D /usr/lib64/pkcs11/opensc-pkcs11.so >> ~<example_user>/.ssh/authorized_keys

3. SSH requires access right configuration for the /.ssh directory and the authorized_keys file. To set or change the access rights, enter:

   # chown -R <example_user:example_user> ~<example_user>/.ssh/
   # chmod 700 ~<example_user>/.ssh/
   # chmod 600 ~<example_user>/.ssh/authorized_keys

Verification

1. Display the keys:

   # cat ~<example_user>/.ssh/authorized_keys

   The terminal displays the keys.