PAM_CHAUTHTOK(3) App. Programmers' Manual PAM_CHAUTHTOK(3)
pam_chauthtok - updating authentication tokens
int pam_chauthtok(pam_handle_t *pamh, int flags);
Use this function to rejuvenate the authentication tokens (passwords etc.) of an applicant user.
Note, the application should not pre-authenticate the user, as this is performed (if required) by the Linux-PAM framework.
The flags argument can optionally take the value, PAM_CHANGE_EXPIRED_AUTHTOK. In such cases the framework is only required to update those
authentication tokens that have expired. Without this argument, the framework will attempt to obtain new tokens for all configured authen-
tication mechanisms. The details of the types and number of such schemes should not concern the calling application.
A successful return from this function will be indicated with PAM_SUCCESS.
Specific errors of special interest when calling this function are
PAM_AUTHTOK_ERROR - a valid new token was not obtained
PAM_AUTHTOK_RECOVERY_ERR - old authentication token was not available
PAM_AUTHTOK_LOCK_BUSY - a resource needed to update the token was locked (try again later)
PAM_AUTHTOK_DISABLE_AGING - one or more of the authentication modules does not honor authentication token aging
PAM_TRY_AGAIN - one or more authentication mechanism is not prepared to update a token at this time
In general other return values may be returned. They should be treated as indicating failure.
May be translated to text with pam_strerror(3).
DCE-RFC 86.0, October 1995.
pam_start(3), pam_authenticate(3), pam_setcred(3), pam_get_item(3), pam_strerror(3) and pam(8).
Also, see the three Linux-PAM Guides, for System administrators, module developers, and application developers.
Linux-PAM 0.55 1997 Jan 4 PAM_CHAUTHTOK(3)