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Full Discussion: Restrict SUDO Access
Operating Systems Linux Ubuntu Restrict SUDO Access Post 302602004 by admin_xor on Saturday 25th of February 2012 01:29:25 PM
Old 02-25-2012
Looks like you have some kind of problem there. I tested this fully on my RHEL 6.2 box. It's working perfectly. Copying /usr/bin/passwd to another directory and executing does not even work in my case! What's going on in your Ubuntu box?

Here's the snippet in /etc/sudoers:
Code:
testuser ALL=(unixuser:unixuser)  ALL, ! /usr/bin/passwd

Here's what I tested:
Code:
[testuser@blue ~]$ sudo -u unixuser passwd
Sorry, user testuser is not allowed to execute '/usr/bin/passwd' as unixuser on blue.
[testuser@blue ~]$ cp `which passwd` .
[testuser@blue ~]$ ls -l
total 32
-rwxr-xr-x. 1 testuser testuser 32680 Feb 25 11:51 passwd
[testuser@blue ~]$ sudo -u unixuser ./passwd
[testuser@blue ~]$ sudo -u unixuser ./passwd unixuser

Can you check /var/log/secure? Also, make sure that you are using visudo to edit /etc/sudoers file as it will show you syntax error. Recheck all of the aliases you created and make sure there's no colliding rule which permits the user to execute passwd as another.
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LEARN ABOUT POSIX

mkpwdict

mkpwdict(1M)						  System Administration Commands					      mkpwdict(1M)

NAME

       mkpwdict - maintain password-strength checking database

SYNOPSIS

       /usr/sbin/mkpwdict [-s  dict1,... ,dictN] [-d destination-path]

DESCRIPTION

       The mkpwdict command adds words to the dictionary-lookup database used by pam_authtok_check(5) and passwd(1).

       Files containing words to be added to the database can be specified on the command-line using the -s flag. These source files should have a
       single word per line, much like /usr/share/lib/dict/words.

       If -s is omitted, mkpwdict will use the value of DICTIONLIST specified in /etc/default/passwd (see passwd(1)).

       The database is created in the directory specified by the -d option. If this option is omitted, mkpwdict uses  the  value  of  DICTIONDBDIR
       specified in /etc/default/passwd (see passwd(1)). The default location is /var/passwd.

OPTIONS

       The following options are supported:

       -s

	   Specifies a comma-separated list of files containing words to be added to the dictionary-lookup database.

       -d

	   Specifies the target location of the dictionary-database.

FILES

       /etc/default/passwd

	   See passwd(1).

       /var/passwd

	   default destination directory

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       passwd(1), attributes(5), pam_authtok_check(5)

SunOS 5.10							    1 Jun 2004							      mkpwdict(1M)
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