The pam_chauthtok function is used to change the authentication token
for a given user (as indicated by the state associated with the
The pamh argument is an authentication handle obtained by a prior
call to pam_start(). The flags argument is the binary or of zero or
more of the following values:
Do not emit any messages.
This argument indicates to the modules that the user's
authentication token (password) should only be changed if it has
expired. If this argument is not passed, the application requires
that all authentication tokens are to be changed.
A module was unable to obtain the new authentication token.
A module was unable to obtain the old authentication token.
One or more of the modules was unable to change the
authentication token since it is currently locked.
Authentication token aging has been disabled for at least one of
The authentication token was successfully updated.
Not all of the modules were in a position to update the
authentication token(s). In such a case none of the user's
authentication tokens are updated.
User unknown to password service.
This page is part of the linux-pam (Pluggable Authentication Modules
for Linux) project. Information about the project can be found at
⟨https://fedorahosted.org/linux-pam/⟩. If you have a bug report for
this manual page, see ⟨https://fedorahosted.org/linux-pam/report⟩.
This page was obtained from the tarball Linux-PAM-1.3.0.tar.gz
fetched from ⟨http://www.linux-pam.org/library/⟩ on 2017-03-13. 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
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mail to firstname.lastname@example.org
Linux-PAM Manual 04/01/2016 PAM_CHAUTHTOK(3)