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 MOJAVE
dsmemberutil
dsmemberutil(1) BSD General Commands Manual dsmemberutil(1)
NAME
dsmemberutil -- various operations for the membership APIs, including state dump, check memberships, UUIDs, etc.
SYNOPSIS
dsmemberutil [-v] [-h] command [options]
DESCRIPTION
dsmemberutil is a program that implements the membership API calls in a command line utility.
FLAGS
A list of flags and their descriptions:
-h Lists the options for calling dsmemberutil
-v Causes dsmemberutil to operate in verbose mode.
COMMANDS
The action of each command is described below:
getuuid -ugUGsS value
Takes any of the options and returns the associated UUID.
getid -UGsSX value
Takes any of the options and returns the associated UID or GID depending on option provided.
getsid -ugUGX value
Takes any of the options and returns the associated SID.
checkmembership -uUxs param -gGXS param
Returns if a user or group with the associated option is a member of the group.
flushcache Flushes the current membership cache.
Legacy commands such as dumpstate and statistics are gone. See odutil(1) for show cache and statistics operations.
A list of options available. In some cases -xX and -sS can be used synonymously due to nature of the value.
-u uid Using user with UID
-U name Using user with name
-s sid Using user with SID
-x uuid Using user with UUID
-g gid Using group with GID
-G name Using group with name
-S sid Using group with SID
-X uuid Using group with UUID
EXAMPLES
Get a user's uuid:
% dsmemberutil getuuid -u 501
EEA4F2F6-B268-49E7-9C6F-E3C4A37DA4FD
Get a group's uuid
% dsmemberutil getuuid -g 0
ABCDEFAB-CDEF-ABCD-EFAB-CDEF00000000
Get a user's or group's id from a uuid
% dsmemberutil getid -X ABCDEFAB-CDEF-ABCD-EFAB-CDEF0000000C
gid: 12
Check a user's membership in a group (using UID and GID)
% dsmemberutil checkmembership -u 501 -g 0
user is not a member of the group
Check a user's membership in a group (using names)
% dsmemberutil checkmembership -U root -G wheel
user is a member of the group
SEE ALSO
odutil(1), dseditgroup(1), dscacheutil(1)
Darwin Jan 1, 2007 Darwin