# PWHISTORY_HELPER - Helper binary that transfers password hashes from pass... - man(8) - [phpMan]

[_PWHISTORY_HELPER_(8)](https://www.chedong.com/phpMan.php/man/PWHISTORYHELPER/8/markdown)                       Linux-PAM Manual                       [_PWHISTORY_HELPER_(8)](https://www.chedong.com/phpMan.php/man/PWHISTORYHELPER/8/markdown)

## NAME
       pwhistory_helper - Helper binary that transfers password hashes from passwd or shadow to
       opasswd

## SYNOPSIS


       **pwhistory_helper **[...]

## DESCRIPTION
       _pwhistory_helper_ is a helper program for the _pam_pwhistory_ module that transfers password
       hashes from passwd or shadow file to the opasswd file and checks a password supplied by user
       against the existing hashes in the opasswd file.

       The purpose of the helper is to enable tighter confinement of login and password changing
       services. The helper is thus called only when SELinux is enabled on the system.

       The interface of the helper - command line options, and input/output data format are internal
       to the _pam_pwhistory_ module and it should not be called directly from applications.

## SEE ALSO
       [**pam_pwhistory**(8)](https://www.chedong.com/phpMan.php/man/pampwhistory/8/markdown)

## AUTHOR
       Written by Tomas Mraz based on the code originally in _pam_pwhistory_ _and_ _pam_unix_ modules.

Linux-PAM                                    05/07/2023                          [_PWHISTORY_HELPER_(8)](https://www.chedong.com/phpMan.php/man/PWHISTORYHELPER/8/markdown)