Helper binary that updates the password of a given user
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is a helper program for the pam_unix module that
updates the password of a given user. It is not intended to
be run directly from the command line and logs a security
violation if done so.
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 and in the enforcing mode on the
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.
Tomas Mraz and other various people.