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Top Forums UNIX for Advanced & Expert Users ssh: require passphrase from some servers but not others Post 302333558 by jim mcnamara on Monday 13th of July 2009 11:20:34 AM
Old 07-13-2009
Do you mean ssh access sometimes w/key and sometimes wo/key from the same account and node?

No. You cannot decide to turn/off/on passwordless key for some jobs and not others for one single account. Access is on a per user account basis, not per job.

You should consider creating protected key-only account(s), and grant only certain users sudo to that account(s). Which is akin to your idea of 'session-level'

You could also create one or more remote ssh-only account, example dummy, then give the keys to certain users and not others. Those with the key can go in with
Code:
ssh dummy@somenode

You can create different remote user accounts which are job specific, granting code access by chrooting each account and having links in /usr/bin (or wherever) that give access only to the code/scripts needed to run just that job.
 

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SSH-COPY-ID(1)						      General Commands Manual						    SSH-COPY-ID(1)

NAME
ssh-copy-id - install your public key in a remote machine's authorized_keys SYNOPSIS
ssh-copy-id [-i [identity_file]] [user@]machine DESCRIPTION
ssh-copy-id is a script that uses ssh to log into a remote machine and append the indicated identity file to that machine's ~/.ssh/autho- rized_keys file. If the -i option is given then the identity file (defaults to ~/.ssh/id_rsa.pub) is used, regardless of whether there are any keys in your ssh-agent. Otherwise, if this: ssh-add -L provides any output, it uses that in preference to the identity file. If the -i option is used, or the ssh-add produced no output, then it uses the contents of the identity file. Once it has one or more fin- gerprints (by whatever means) it uses ssh to append them to ~/.ssh/authorized_keys on the remote machine (creating the file, and directory, if necessary.) NOTES
This program does not modify the permissions of any pre-existing files or directories. Therefore, if the remote sshd has StrictModes set in its configuration, then the user's home, ~/.ssh folder, and ~/.ssh/authorized_keys file may need to have group writability disabled manu- ally, e.g. via chmod go-w ~ ~/.ssh ~/.ssh/authorized_keys on the remote machine. SEE ALSO
ssh(1), ssh-agent(1), sshd(8) OpenSSH 14 November 1999 SSH-COPY-ID(1)
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