pam_succeed_if - test account characteristics
pam_succeed_if.so [flag...] [condition...]
pam_succeed_if.so is designed to succeed or fail authentication based on characteristics of the account belonging to the user being authenticated or values of other PAM items. One use is to select whether to load other modules based on this test.
The module should be given one or more conditions as module arguments, and authentication will succeed only if all of the conditions are met.
The following flags are supported:
Conditions are three words: a field, a test, and a value to test for.
Available fields are user, uid, gid, shell, home, ruser, rhost, tty and service:
field < number
field <= number
field eq number
field >= number
field > number
field ne number
field = string
field != string
field =~ glob
field !~ glob
field in item:item:...
field notin item:item:...
user ingroup group[:group:....]
user notingroup group[:group:....]
user innetgr netgroup
user notinnetgr group
All module types (account, auth, password and session) are provided.
To emulate the behaviour of pam_wheel, except there is no fallback to group 0 being only approximated by checking also the root group membership:
auth required pam_succeed_if.so quiet user ingroup wheel:root
Given that the type matches, only loads the othermodule rule if the UID is over 500. Adjust the number after default to skip several rules.
type [default=1 success=ignore] pam_succeed_if.so quiet uid > 500 type required othermodule.so arguments...
Nalin Dahyabhai <email@example.com>