/*
* opie_keyinfo()
*
* Returns the current sequence number and
* seed for the passed user.
*
*/
char *
opie_keyinfo(char *username)
{
int i;
static char str[OPIE_CHALLENGE_MAX];
struct opie opie;
i = opiechallenge(&opie, username, str);
if (i == -1)
return(0);
return(str);
}
PAM_EXTERN int
pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
struct opie opie;
struct options options;
struct passwd *pwd;
int retval, i;
char *(promptstr[]) = { "%s\nPassword: "******"%s\nPassword [echo on]: "};
char challenge[OPIE_CHALLENGE_MAX];
char prompt[OPIE_CHALLENGE_MAX+22];
char resp[OPIE_SECRET_MAX];
const char *user;
const char *response;
pam_std_option(&options, other_options, argc, argv);
PAM_LOG("Options processed");
/*
* It doesn't make sense to use a password that has already been
* typed in, since we haven't presented the challenge to the user
* yet.
*/
if (pam_test_option(&options, PAM_OPT_USE_FIRST_PASS, NULL) ||
pam_test_option(&options, PAM_OPT_TRY_FIRST_PASS, NULL))
PAM_RETURN(PAM_AUTH_ERR);
user = NULL;
if (pam_test_option(&options, PAM_OPT_AUTH_AS_SELF, NULL)) {
pwd = getpwnam(getlogin());
user = pwd->pw_name;
}
else {
retval = pam_get_user(pamh, (const char **)&user, NULL);
if (retval != PAM_SUCCESS)
PAM_RETURN(retval);
}
PAM_LOG("Got user: %s", user);
/*
* Don't call the OPIE atexit() handler when our program exits,
* since the module has been unloaded and we will SEGV.
*/
opiedisableaeh();
opiechallenge(&opie, (char *)user, challenge);
for (i = 0; i < 2; i++) {
snprintf(prompt, sizeof prompt, promptstr[i], challenge);
retval = pam_get_pass(pamh, &response, prompt, &options);
if (retval != PAM_SUCCESS) {
opieunlock();
PAM_RETURN(retval);
}
PAM_LOG("Completed challenge %d: %s", i, response);
if (response[0] != '\0')
break;
/* Second time round, echo the password */
pam_set_option(&options, PAM_OPT_ECHO_PASS);
}
/* We have to copy the response, because opieverify mucks with it. */
snprintf(resp, sizeof resp, "%s", response);
/*
* Opieverify is supposed to return -1 only if an error occurs.
* But it returns -1 even if the response string isn't in the form
* it expects. Thus we can't log an error and can only check for
* success or lack thereof.
*/
PAM_RETURN(opieverify(&opie, resp) == 0 ? PAM_SUCCESS : PAM_AUTH_ERR);
}