unix_chkpwd - Helper binary that verifies the password of the current user
is a helper program for the pam_unix
verifies the password of the current user. It also checks password and account
expiration dates in shadow
. It is not intended to be run directly from
the command line and logs a security violation if done so.
It is typically installed setuid root or setgid shadow.
The interface of the helper - command line options, and input/output data format
are internal to the pam_unix
module and it should not be called
directly from applications.
Written by Andrew Morgan and other various people.