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Full Discussion: Restrict SUDO Access
Operating Systems Linux Ubuntu Restrict SUDO Access Post 302601911 by explorer007 on Friday 24th of February 2012 09:39:03 PM
Old 02-24-2012
Restrict SUDO Access

Linux ubuntu 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:56:25 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
Hi Folks,

Please help me. I am bit struck here.

Here is the OS info.
Linux ubuntu 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:56:25 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

I have a user Alex( userif alex:admin) and trying to grant him sudo access to a userid (cbttest:sytgrp) i.e granting sudo to ID cbttest

I have added the following info to /etc/sudoers file.

alex ALL=(cbttest:sytgrp) ALL

It was working fine, alex was able to sudo to cbttest.

Now I want to restrict alex not to execute passwd change so tried the below options none worked.

alex ALL=(cbttest:sytgrp) ALL, !/usr/bin/passwd

Cmnd_Alias PASSWD=/usr/bin/passwd
alex ALL=(cbttest:sytgrp) ALL, !PASSWD

alex ALL=(cbttest:sytgrp) !/usr/bin/passwd

alex ALL=(cbttest:sytgrp) ALL, !/usr/bin/pass*

none of the above options worked. Please helpme in restricting the user to execute all like cbttest except passwd
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UPDATE-PASSWD(8)					      System Manager's Manual						  UPDATE-PASSWD(8)

NAME
update-passwd - safely update /etc/passwd, /etc/shadow and /etc/group SYNOPSIS
update-passwd [options] DESCRIPTION
update-passwd handles updates of /etc/passwd, /etc/shadow and /etc/group on running Debian systems. It compares the current files to mas- ter copies, distributed in the base-passwd package, and updates all entries in the global system range (that is, 0-99). OPTIONS
update-passwd follows the usual GNU command line syntax, with long options starting with two dashes ('-'). -p, --passwd-master=FILE Use FILE as the master copy of the passwd database. The default value is /usr/share/base-passwd/passwd.master. -g, --group-master=FILE Use FILE as the master copy of the group database. The default value is /usr/share/base-passwd/group.master. -P, --passwd=FILE Use FILE as the system passwd database. The default value is /etc/passwd. -S, --shadow=FILE Use FILE as the system shadow database. The default value is /etc/shadow. -G, --group=FILE Use FILE as the system group database. The default value is /etc/group. -s, --sanity-check Only perform sanity-checks but don't do anything. -v, --verbose Give detailed information about what we are doing. A second -v gives additional detail. -n, --dry-run Don't do anything but only show what we would do. -L, --no-locking Don't attempt to lock the account database. This should only be used for debugging purposes. I repeat: do not do this unless you are really sure you need this! -h, --help Show a summary of how to use update-passwd. -V, --version Show the version number BUGS
At this moment update-passwd does not verify the shadow-file. It should check if the entries in the passwd are also in shadow and vice versa, and that passwords are not present in both files. AUTHOR
Wichert Akkerman <wakkerma@debian.org> This program was written for the Debian project, and is copyright 1999-2002 Wichert Akkerman and copyright 2002, 2003 Colin Watson. It is distributed under version 2 of the GNU General Public License. DEBIAN
Debian tools UPDATE-PASSWD(8)
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