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Operating Systems Linux Red Hat changing which password is prompted for in sudoers Post 302714473 by thmnetwork on Friday 12th of October 2012 08:11:05 AM
Old 10-12-2012
changing which password is prompted for in sudoers

Basically I only want particular users to know the root password, but I also want power users to be able to run certain commands with root privileges. All admins for this box will be authenticating initially through winbind (I do have a backdoor account in case winbind goes wonky)

I want members of the "domain admins" group to be prompted for the root password but have unrestricted sudo access, while members of the "JSNNUsers" group be able to execute the list of commands I've specified, being prompted only for their own password (in case they leave themselves logged in and someone comes up behind them before the console times out, 15 minutes).

I know I can change this behavior on a per-user basis by doing something like:

Defaults:targetUser   targetpw

But I was interested in getting it to work work when specifying a group with a space in it. I'd rather not create a second group since all domain admins should be allowed root access to this box and the AD side may not necessarily remember to add them to an additional group when new domain admins are created (not to mention it seems redundant).

I got around the space issue in the actual rule itself by escaping the space:

%domain\ admins   ALL=(ALL)    PASSWD: ALL

But apparently this doesn't also work for changing defaults.

So it basically boils down to this: how do I change the default behavior for the "domain admins" group's password prompt without changing it so that everybody is prompted for the root password.

- Joel

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GSHADOW(5)						   File Formats and Conversions 						GSHADOW(5)

gshadow - shadowed group file DESCRIPTION
/etc/gshadow contains the shadowed information for group accounts. This file must not be readable by regular users if password security is to be maintained. Each line of this file contains the following colon-separated fields: group name It must be a valid group name, which exist on the system. encrypted password Refer to crypt(3) for details on how this string is interpreted. If the password field contains some string that is not a valid result of crypt(3), for instance ! or *, users will not be able to use a unix password to access the group (but group members do not need the password). The password is used when a user who is not a member of the group wants to gain the permissions of this group (see newgrp(1)). This field may be empty, in which case only the group members can gain the group permissions. A password field which starts with an exclamation mark means that the password is locked. The remaining characters on the line represent the password field before the password was locked. This password supersedes any password specified in /etc/group. administrators It must be a comma-separated list of user names. Administrators can change the password or the members of the group. Administrators also have the same permissions as the members (see below). members It must be a comma-separated list of user names. Members can access the group without being prompted for a password. You should use the same list of users as in /etc/group. FILES
/etc/group Group account information. /etc/gshadow Secure group account information. SEE ALSO
gpasswd(5), group(5), grpck(8), grpconv(8), newgrp(1). shadow-utils 4.5 01/25/2018 GSHADOW(5)

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