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8장. Authenticating to sudo remotely using smart cards

You can authenticate to sudo remotely using smart cards. After the ssh-agent service is running locally and can forward the ssh-agent socket to a remote machine, you can use the SSH authentication protocol in the sudo PAM module to authenticate users remotely.

After logging in locally using a smart card, you can log in through SSH to the remote machine and run the sudo command without being prompted for a password by using SSH forwarding of the smart card authentication.

For the purposes of this example, a client is connecting to the IPA server through SSH and running the sudo command on the IPA server with credentials stored on a smart card.

8.1. Creating sudo rules in IdM
링크 복사

Follow this procedure to create sudo rules in IdM to give <idm_user> permission to run sudo on the remote host.

For the purposes of this example, the less and whoami commands are added as sudo commands to test the procedure.

Prerequisites

  • The IdM user has been created. For the purpose of this example, the user is <idm_user>.
  • You have the hostname of the system where you are running sudo remotely. For the purpose of this example, the host is server.ipa.test.

Procedure

  1. Create a sudo rule named <sudorule_name> to allow a user to run commands. Replace <sudorule_name> with the actual name of the sudo rule you want to create. 

    # ipa sudorule-add <sudorule_name>

  2. Add less and whoami as sudo commands: 

    # ipa sudocmd-add /usr/bin/less
# ipa sudocmd-add /usr/bin/whoami

  3. Add the less and whoami commands to the <sudorule_name>: 

    # ipa sudorule-add-allow-command <sudorule_name> --sudocmds /usr/bin/less
# ipa sudorule-add-allow-command <sudorule_name> --sudocmds /usr/bin/whoami

  4. Add the <idm_user> user to the <sudorule_name>: 

    # ipa sudorule-add-user <sudorule_name> --users <idm_user>

  5. Add the host on which you are running sudo to the <sudorule_name>: 

    # ipa sudorule-add-host <sudorule_name> --hosts server.ipa.test
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