Sudo

From Leo's Notes
Revision as of 19:58, 20 January 2015 by 136.159.16.240 (talk) (su instead of sudo)
This page was last edited on 20 January 2015, at 19:58.

In a Nutshell

In a nutshell, sudo permissions are defined in /etc/sudoers and /etc/sudoers.d/. Permissions are defined like so: 

%groupname workstation=/bin/command
username workstation=/bin/command
username workstation=(run-as user) /bin/command

Replace any of the above with ALL to have it match anyone. eg: 

ALL ALL=ALL

You can use NOPASSWD: /bin/command to have it not prompt for the user's password.

You can verify whether your changes worked by listing sudo access: 

sudo -l


Configure sudo to include /etc/sudoers.d/

For the configs in /etc/sudoers.d/ to work, you must place an existing file with perms set to 0440 into /etc/sudoers.d/.

You cannot create the file directly in /etc/sudoers.d/ because it will not work!

Also ensure the #includedir directive is defined in /etc/sudoers.

Troubleshooting

sudo: sorry, you must have a tty to run sudo

Ensure that you do not require tty. Either comment out or use !requiretty . 

# cat /etc/sudoers
Defaults   ! requiretty

If you want to run a command as another user, you could also try su. For example: 

su user -c 'whoami'

sudo: no tty present and no askpass program specified

make sure you have NOPASSWD set in your sudoers file. eg: 

 <USER> <host>=NOPASSWD:<command>