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.
This page is part of the linux-pam (Pluggable Authentication
Modules for Linux) project. Information about the project can be
found at ⟨http://www.linux-pam.org/⟩. If you have a bug report
for this manual page, see ⟨//www.linux-pam.org/⟩. This page was
obtained from the project's upstream Git repository
⟨https://github.com/linux-pam/linux-pam.git⟩ on 2023-12-22. (At
that time, the date of the most recent commit that was found in
the repository was 2023-12-18.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
Linux-PAM Manual 12/22/2023 PWHISTORY_HELPER(8)