I'm new to UNIX programming.

I have a small program which simply ask the user to enter a longinID and password, then, use pam_authenticate(...) to do the authentication.
It executed fine with userID that do not have a password, (i.e. the password is set to NULL in the passwd file).
However, with userID that has a none NULL value or with a userID that does not exist in the system, it gave me a coredump.

I compiled and ran the program on a Solaris 2.6 (SunOS 5.6 Generic_105181-05 ... , Ultra-5_10).

If any can give me tip as to how to fix this or where can I get the answer, your help is much appreciated.

Thanks,

Here is the program:

#include <stdio.h>
#include <security/pam_appl.h>

int authConv(int num_msg, struct pam_message **msg, struct pam_response **res, void *pAppData);
struct pam_conv pamConv = {authConv, NULL};

int main()
{
 char uid[15];
 char passwd[20];
 pam_handle_t* pHPam;
 int iPamError = 0;

 fprintf(stderr, "Login ID: ");
 scanf("%s", uid);
 fprintf(stderr, "Password: ");
 scanf("%s", passwd);

 fprintf(stderr, "%s, %s\n", uid, passwd);
 if (pam_start("login", uid, &pamConv, &pHPam) != PAM_SUCCESS)
 {
  fprintf(stderr, "pam_start() failed.\n");
  return 1;
 }

 fprintf(stderr, "pam started.\n");
 pam_set_item(pHPam, PAM_AUTHTOK, (void*) passwd);

 fprintf(stderr, "token is set\n");
 iPamError = pam_authenticate(pHPam, 0);

 if (PAM_SUCCESS == iPamError)
 {
  fprintf(stderr, "login succeeded!.\n");
 }
 else
 {
  fprintf(stderr, "login failed: %s\n", pam_strerror(pHPam, iPamError));
 }
 
 pam_end(pHPam, PAM_SUCCESS);

 return PAM_SUCCESS;
}

int authConv(int num_msg, struct pam_message **msg, struct pam_response **res, void *pAppData)
{
 return PAM_SUCCESS;
}

-Hay

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