/*      $NetBSD: pam_echo.c,v 1.2 2004/12/12 08:18:44 christos Exp $    */

/*-
* Copyright (c) 2001,2003 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project by ThinkSec AS and
* NAI Labs, the Security Research Division of Network Associates, Inc.
* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
* DARPA CHATS research program.
*
* 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.
* 3. The name of the author may not be used to endorse or promote
*    products derived from this software without specific prior written
*    permission.
*
* 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>
#ifdef __FreeBSD__
__FBSDID("$FreeBSD: src/lib/libpam/modules/pam_echo/pam_echo.c,v 1.4 2003/12/11 13:55:15 des Exp $");
#else
__RCSID("$NetBSD: pam_echo.c,v 1.2 2004/12/12 08:18:44 christos Exp $");
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

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

static int
_pam_echo(pam_handle_t *pamh, int flags,
   int argc, const char *argv[])
{
       char msg[PAM_MAX_MSG_SIZE];
       const void *str;
       const char *p, *q;
       int err, i, item;
       size_t len;

       if (flags & PAM_SILENT)
               return (PAM_SUCCESS);
       for (i = 0, len = 0; i < argc && len < sizeof(msg) - 1; ++i) {
               if (i > 0)
                       msg[len++] = ' ';
               for (p = argv[i]; *p != '\0' && len < sizeof(msg) - 1; ++p) {
                       if (*p != '%' || p[1] == '\0') {
                               msg[len++] = *p;
                               continue;
                       }
                       switch (*++p) {
                       case 'H':
                               item = PAM_RHOST;
                               break;
                       case 'h':
                               /* not implemented */
                               item = -1;
                               break;
                       case 's':
                               item = PAM_SERVICE;
                               break;
                       case 't':
                               item = PAM_TTY;
                               break;
                       case 'U':
                               item = PAM_RUSER;
                               break;
                       case 'u':
                               item = PAM_USER;
                               break;
                       default:
                               item = -1;
                               msg[len++] = *p;
                               break;
                       }
                       if (item == -1)
                               continue;
                       err = pam_get_item(pamh, item, &str);
                       if (err != PAM_SUCCESS)
                               return (err);
                       if (str == NULL)
                               str = "(null)";
                       for (q = str; *q != '\0' && len < sizeof(msg) - 1; ++q)
                               msg[len++] = *q;
               }
       }
       msg[len] = '\0';
       return (pam_info(pamh, "%s", msg));
}

PAM_EXTERN int
pam_sm_authenticate(pam_handle_t *pamh, int flags,
   int argc, const char *argv[])
{

       return (_pam_echo(pamh, flags, argc, argv));
}

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

       return (PAM_SUCCESS);
}

PAM_EXTERN int
pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
   int argc, const char *argv[])
{

       return (_pam_echo(pamh, flags, argc, argv));
}

PAM_EXTERN int
pam_sm_open_session(pam_handle_t *pamh, int flags,
   int argc, const char *argv[])
{

       return (_pam_echo(pamh, flags, argc, argv));
}

PAM_EXTERN int
pam_sm_close_session(pam_handle_t *pamh, int flags,
   int argc, const char *argv[])
{

       return (_pam_echo(pamh, flags, argc, argv));
}

PAM_EXTERN int
pam_sm_chauthtok(pam_handle_t *pamh, int flags,
   int argc, const char *argv[])
{

       if (flags & PAM_PRELIM_CHECK)
               return (PAM_SUCCESS);
       return (_pam_echo(pamh, flags, argc, argv));
}

PAM_MODULE_ENTRY("pam_echo");