The Self authentication component
(pam_sm_authenticate
()), returns success if and only
if the target user's user ID is identical with the current real user ID. If
the current real user ID is zero, authentication will fail, unless the
allow_root
option was specified.
The following options may be passed to the authentication
module:
debug
- syslog(3) debugging
information at
LOG_DEBUG
level.
no_warn
- suppress warning messages to the user. These messages include reasons why
the user's authentication attempt was declined.
allow_root
- do not automatically fail if the current real user ID is 0.