PAM_CHAUTHTOK(3)              Linux-PAM Manual              PAM_CHAUTHTOK(3)

NAME         top

       pam_chauthtok - updating authentication tokens

SYNOPSIS         top

       #include <security/pam_appl.h>

       int pam_chauthtok(pam_handle_t *pamh, int flags);

DESCRIPTION         top

       The pam_chauthtok function is used to change the authentication token
       for a given user (as indicated by the state associated with the
       handle pamh).

       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.

RETURN VALUES         top

           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 modules.

           Permission denied.

           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.

SEE ALSO         top

       pam_start(3), pam_authenticate(3), pam_setcred(3), pam_get_item(3),
       pam_strerror(3), pam(8)

COLOPHON         top

       This page is part of the linux-pam (Pluggable Authentication Modules
       for Linux) project.  Information about the project can be found at 
       ⟨⟩.  If you have a bug report for
       this manual page, see ⟨⟩.
       This page was obtained from the tarball Linux-PAM-1.3.0.tar.gz
       fetched from ⟨⟩ 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
       this COLOPHON (which is not part of the original manual page), send a
       mail to

Linux-PAM Manual                 04/01/2016                 PAM_CHAUTHTOK(3)