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/*-
* Copyright 2000 James Bloom
* All rights reserved.
* Based upon code Copyright 1998 Juniper Networks, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <opie.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#define PAM_SM_AUTH
#include <security/pam_modules.h>
#include "pam_mod_misc.h"
enum { PAM_OPT_AUTH_AS_SELF=PAM_OPT_STD_MAX };
static struct opttab other_options[] = {
{ "auth_as_self", PAM_OPT_AUTH_AS_SELF },
{ NULL, 0 }
};
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.
*/
retval = opieverify(&opie, resp) == 0 ? PAM_SUCCESS : PAM_AUTH_ERR;
PAM_RETURN(retval);
}
PAM_EXTERN int
pam_sm_setcred(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
struct options options;
pam_std_option(&options, other_options, argc, argv);
PAM_LOG("Options processed");
PAM_RETURN(PAM_SUCCESS);
}
PAM_MODULE_ENTRY("pam_opie");
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