attempt_krb5_auth
result = attempt_krb5_auth(pamh, kmd, user, &password, 1);
int attempt_krb5_auth(pam_handle_t *, krb5_module_data_t *, const char *,
login_result = attempt_krb5_auth(pamh, kmd, user, &newpass, 0);
extern int attempt_krb5_auth(pam_handle_t *, krb5_module_data_t *, const char *,