Manual: unix_chkpwd

UNIX_CHKPWD(8)					      Linux-PAM Manual					      UNIX_CHKPWD(8)

NAME
       unix_chkpwd - Helper binary that verifies the password of the current user

SYNOPSIS

       unix_chkpwd [...]

DESCRIPTION
       unix_chkpwd is a helper program for the pam_unix module that 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.

SEE ALSO
       pam_unix(8)

AUTHOR
       Written by Andrew Morgan and other various people.

Linux-PAM						 07/16/2026					      UNIX_CHKPWD(8)