11-04-2001
The su program needs to have its effective uid set to zero as it runs. Changing the permissions to 550 creates an su program that only root can use. You need to do:
chmod 4550 su
if you're going to do this. And you could create a wheel group while you're at it. This is how bsd did it. They just create the wheel group, set the su program to be group wheel and the mode to be 4550.
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LEARN ABOUT OSX
pam_group
pam_group(8) BSD System Manager's Manual pam_group(8)
NAME
pam_group -- Group PAM module
SYNOPSIS
[service-name] function-class control-flag pam_group [options]
DESCRIPTION
The Group PAM module supports the account management function class. In terms of the function-class parameter, this is the ``account''
class.
The Group account management module permits or denies users based on their membership to a particular group (or groups) specified with the
group option. If no groups are specified the default group (``wheel'') will be used.
The following options may be passed to this account management module:
deny Reverse the meaning of the test, i.e., reject the applicant if and only if he or she is a member of the specified group. This
can be useful to exclude certain groups of users from certain services.
fail_safe If the specified group does not exist, or has no members, act as if it does exist and the applicant is a member.
group=groupname
Specify the name of the group to check. This can be a comma-separated list (i.e. ``group=admin,wheel'').
root_only Skip this module entirely if the target account is not the superuser account.
ruser Check the membership of the applicant (PAM_RUSER), rather than the target account (PAM_USER)
SEE ALSO
pam_get_item(3), pam.conf(5), pam(8), DirectoryService(8)
AUTHORS
The pam_group module and this manual page were developed for the FreeBSD Project by ThinkSec AS and NAI Labs, the Security Research Division
of Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 (``CBOSS''), as part of the DARPA CHATS research program.
BSD
February 7, 2009 BSD