/*      $NetBSD: pam_skey.c,v 1.3 2008/04/28 20:23:01 martin Exp $      */

/*-
* Copyright (c) 2005 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
__RCSID("$NetBSD: pam_skey.c,v 1.3 2008/04/28 20:23:01 martin Exp $");

#include <sys/types.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <skey.h>

#define PAM_SM_AUTH

#include <security/pam_appl.h>
#include <security/pam_modules.h>
#include <security/pam_mod_misc.h>

/*
* authentication management
*/
PAM_EXTERN int
/*ARGSUSED*/
pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
   int argc __unused, const char *argv[] __unused)
{
       const char *user, *skinfo, *pass;
       char *response;
       int retval;
       char skprompt[80];

       if (openpam_get_option(pamh, PAM_OPT_AUTH_AS_SELF)) {
               user = getlogin();
       } else {
               retval = pam_get_user(pamh, &user, NULL);
               if (retval != PAM_SUCCESS)
                       return (retval);
               PAM_LOG("Got user: %s", user);
       }

       if (skey_haskey(user) != 0)
               return (PAM_SERVICE_ERR);       /* XXX PAM_AUTHINFO_UNAVAIL? */

       skinfo = skey_keyinfo(user);
       if (skinfo == NULL) {
               PAM_VERBOSE_ERROR("Error getting S/Key challenge");
               return (PAM_SERVICE_ERR);
       }

       (void) snprintf(skprompt, sizeof(skprompt),
           "Password [ %s ]:", skinfo);

       retval = pam_get_authtok(pamh, PAM_AUTHTOK, &pass, skprompt);
       if (retval != PAM_SUCCESS)
               return (retval);

       response = strdup(pass);
       if (response == NULL) {
               pam_error(pamh, "Unable to copy S/Key response");
               return (PAM_SERVICE_ERR);
       }

       retval = skey_passcheck(user, response) == -1 ?
           PAM_AUTH_ERR : PAM_SUCCESS;

       free(response);

       return (retval);
}

PAM_EXTERN int
/*ARGSUSED*/
pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
   int argc __unused, const char *argv[] __unused)
{

       return (PAM_SUCCESS);
}

PAM_MODULE_ENTRY("pam_skey");