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Support_Using_SSH_without_passwords

The following describes how to setup a key-based and thus passwordless SSH access.

Requirements

  • SSH (SSH is installed on CML Macs by default)
  • LDAP-Account (your account as project member)

SSH public and private keys

  • For passwordless SSH access each user needs to create a private and public key set.
  • On CML Macs both keys need to be placed in the $HOME/.ssh directory. If there is no such directory in your $HOME it needs to be created:
$:> mkdir $HOME/.ssh

  • (only the $HOME-directory owner should have access to this directory corresponding to access rights set to 700 using chmod).

  • Then create the private and public key:
$:> ssh-keygen -t dsa -f $HOME/.ssh/id_dsa -P ''

  • A key pair is created within the .ssh directory (id_dsa and id_dsa.pub). Then run the following command:
$:> cat id_dsa.pub >> $HOME/.ssh/authorized_keys2

That is it for CML Macs. For passwordless access from other than the CML Macs, the private key needs to be placed in the $HOME/.ssh directory on that particular machine. The public key (inside authorized_keys2) needs to stay in your LDAP account's $HOME-directory!!!

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