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Old 05-29-2017, 08:21 AM   #1
Kefijoo
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SSH script with SSH keys and sudo privileges


I have a additional questions regarding SSH keys:
If you connect using SSH with SSH keys and run commands which require sudo privileges, how do you do this? With a password, you would run the sudo command and enter a pwd for more privileges, but how to do this in a script?

This question is related to the following thread:
Quote:
Originally Posted by gsr_kashyap View Post
ssh login using a script
 
Old 05-29-2017, 08:43 AM   #2
Turbocapitalist
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Welcome.

You'll have to work through it in several steps, first manually then in a more automated fashion. You'll probably want to make a separate key for this activity, then add command="sudo something in the public key which you've placed in authorized_keys on the server. For that, see the manual page for sshd in the section on "authorized_keys file format"

Code:
man sshd
When that works manually, modify /etc/sudoers so that the command with its specific parameters (and only those parameters) can be run with no password. For that see the manual page for sudoers

Code:
man sudoers
And if you need more background, ask here. But also spend the time to go through the book sudo Mastery by Michael W Lucas or else his presentation:

The idea is to use sudo with the least amount of privilege possible to get the job done.
 
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Old 05-29-2017, 09:42 AM   #3
NevemTeve
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Guess the actual question is: how to configure /etc/sudoers
Here is an example:
Code:
teddy ALL=NOPASSWD: /sbin/halt "", /sbin/reboot "", /bin/umount /dev/cdrom
user teddy might execute the listed commands without password; e.gm sudo /sbin/halt (resulting /sbin/halt as root)

Last edited by NevemTeve; 05-29-2017 at 09:44 AM.
 
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Old 06-09-2017, 02:27 AM   #4
Kefijoo
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Thank you both, this helped me a lot. I wasn't sure if I had to modify sudoers, but it seems the way to go.
 
  


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