SSH with passphrase
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The following recipe works on both Mac OSX and Linux.
First log in on computer A as user a and generate a pair of authentication keys, open Terminal:
A:~ a$ ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/Users/a/.ssh/id_rsa): Created directory '/Users/a/.ssh'. Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /Users/a/.ssh/id_rsa. Your public key has been saved in /Users/a/.ssh/id_rsa.pub. The key fingerprint is: 95:9f:a5:6a:d0:2d:82:68:6f:9c:c5:38:20:e4:e5:7c a@A.phys.uu.nl
Now use ssh to create a directory ~/.ssh as user ‘solisid’ on staff.science.uu.nl (the directory may already exist)
A:~ a$ ssh ‘solisid’@staff.science.uu.nl mkdir –p .ssh ‘solisid’@staff.science.uu.nl's password:
Finally append a’s new public key to
‘solisid’@staff.science.uu.nl:.ssh/authorized_keys2
and enter password for ‘solisid’@staff.science.uu.nl (not passphrase)
A:~ a$ cat .ssh/id_rsa.pub | ssh ‘solisid’@staff.science.uu.nl 'cat >> .ssh/authorized_keys2' ‘solisid’@staff.science.uu.nl's password:
From now on you can log into staff.science.uu.nl from A with passphrase (image on right for Mac OSX only).
A:~ A$ ssh ‘solisid’@staff.science.uu.nl Last login: Wed Sep 18 12:41:48 2013 from A.phys.uu.nl ********************************************************************* * Welcome to staff.science.uu.nl * * * * This is Scientific Linux 5.5 (www.scientificlinux.org) * * Hardware: Dual Quad Core AMD 2378 @2.4 GHz, 32 Gb memory * * * * Questions and software requests: * * https://ict-servicedesk.uu.nl * ********************************************************************* * Do you want to run multiple "background-jobs" ? * * ALWAYS USE THE BATCH SYSTEM ! (bonus is higher Prio!) * * Please read the man-pages first * * % man sge_intro ; for usage of the batch system * * % man qsub ; for job submission * * * * Check current queue status * * % qstat -f -ne -u "*" * ********************************************************************* * HISTORY: * * <> * * 26-03-2013 : Matlab R2013a (/usr/local/MATLAB/R2013a/bin) * * 26-03-2013 : Maple17 (/usr/local/maple/maple17/bin) * * 31-05-2013 : R (V3.0.1) (/usr/local/R-3.0.1/bin/R) * ********************************************************************* -bash-3.2
Change the permissions of .ssh to 700
-bash-3.2$ chmod 700 .ssh
Change the permissions of .ssh/authorized_keys2 to 600
-bash-3.2$ chmod 600 .ssh/authorized_keys2