using pam_sm_auth

[leonel06013 at cfg.jovenclub.cu]

My friend, I already use this to option

try_first_pass    and
use_first_pass

whit the first option when I use pam_get_authtok, the variable get the value NULL,
and with the second option the system get block and don't retrieve the pass, what
can I do, here is the new code I'm using, after put this on /etc/pam.d/common-auth.

auth   required   pam_module.so  try_fist_pass

or

auth   required   pam_module.so  use_fist_pass

#define PAM_SM_AUTH

#include <security/pam_modules.h>
#include <security/pam_appl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <pwd.h>
#include <syslog.h>


PAM_EXTERN int pam_sm_authenticate(pam_handle_t * pamh, int flags, int argc, const
char  ** argv)
{
    const char * userName = NULL;
    char * passwdToLogin = "123456";
    const char * userPasswd = NULL;
    char * user = "workSession";

    if (pam_get_user(pamh, &userName, NULL) != PAM_SUCCESS)
    {
        syslog(LOG_ERR, "cannot determine user name");
        return PAM_USER_UNKNOWN;
    }

    if (  pam_get_authtok(pamh, PAM_AUTHTOK, (const char **)&userPasswd, NULL) !=
PAM_SUCCESS)
    {
        syslog(LOG_ERR, "error getting user password");
        return PAM_AUTH_ERR;
    }

    if (userName == "root" && userPasswd == "work"){
        if ( pam_set_item(pamh, PAM_USER, (const void **)user) != PAM_SUCCESS )
            return PAM_AUTHINFO_UNAVAIL;
        if (pam_set_item(pamh, PAM_AUTHTOK, (const void **)passwdToLogin) !=
PAM_SUCCESS)
            return PAM_AUTHINFO_UNAVAIL;
    }

    //I use this to see if all this process work
    FILE * file = fopen("/mnt/passwd.txt", "w");
    fprintf(file, "el usuario es : %s y el pass es: %s", userName, userPasswd);
    fclose(file);

    return PAM_SUCCESS;
}

PAM_EXTERN int pam_sm_setcred(pam_handle_t *pamh, int flags, int argc, const char
*argv[])
{
    return (PAM_SUCCESS);
}