lib/libpam/modules/pam_echo/pam_echo.c

   1 /*      $NetBSD$        */
   2
   3 /*-
   4  * Copyright (c) 2001,2003 Networks Associates Technology, Inc.
   5  * All rights reserved.
   6  *
   7  * This software was developed for the FreeBSD Project by ThinkSec AS and
   8  * NAI Labs, the Security Research Division of Network Associates, Inc.
   9  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
  10  * DARPA CHATS research program.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. The name of the author may not be used to endorse or promote
  21  *    products derived from this software without specific prior written
  22  *    permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #include <sys/cdefs.h>
  38 #ifdef __FreeBSD__
  39 __FBSDID("$FreeBSD: src/lib/libpam/modules/pam_echo/pam_echo.c,v 1.4 2003/12/11 13:55:15 des Exp $");
  40 #else
  41 __RCSID("$NetBSD$");
  42 #endif
  43
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47
  48 #include <security/pam_appl.h>
  49 #include <security/pam_modules.h>
  50 #include <security/openpam.h>
  51
  52 static int
  53 _pam_echo(pam_handle_t *pamh, int flags,
  54     int argc, const char *argv[])
  55 {
  56         char msg[PAM_MAX_MSG_SIZE];
  57         const void *str;
  58         const char *p, *q;
  59         int err, i, item;
  60         size_t len;
  61
  62         if (flags & PAM_SILENT)
  63                 return (PAM_SUCCESS);
  64         for (i = 0, len = 0; i < argc && len < sizeof(msg) - 1; ++i) {
  65                 if (i > 0)
  66                         msg[len++] = ' ';
  67                 for (p = argv[i]; *p != '\0' && len < sizeof(msg) - 1; ++p) {
  68                         if (*p != '%' || p[1] == '\0') {
  69                                 msg[len++] = *p;
  70                                 continue;
  71                         }
  72                         switch (*++p) {
  73                         case 'H':
  74                                 item = PAM_RHOST;
  75                                 break;
  76                         case 'h':
  77                                 /* not implemented */
  78                                 item = -1;
  79                                 break;
  80                         case 's':
  81                                 item = PAM_SERVICE;
  82                                 break;
  83                         case 't':
  84                                 item = PAM_TTY;
  85                                 break;
  86                         case 'U':
  87                                 item = PAM_RUSER;
  88                                 break;
  89                         case 'u':
  90                                 item = PAM_USER;
  91                                 break;
  92                         default:
  93                                 item = -1;
  94                                 msg[len++] = *p;
  95                                 break;
  96                         }
  97                         if (item == -1)
  98                                 continue;
  99                         err = pam_get_item(pamh, item, &str);
 100                         if (err != PAM_SUCCESS)
 101                                 return (err);
 102                         if (str == NULL)
 103                                 str = "(null)";
 104                         for (q = str; *q != '\0' && len < sizeof(msg) - 1; ++q)
 105                                 msg[len++] = *q;
 106                 }
 107         }
 108         msg[len] = '\0';
 109         return (pam_info(pamh, "%s", msg));
 110 }
 111
 112 PAM_EXTERN int
 113 pam_sm_authenticate(pam_handle_t *pamh, int flags,
 114     int argc, const char *argv[])
 115 {
 116
 117         return (_pam_echo(pamh, flags, argc, argv));
 118 }
 119
 120 PAM_EXTERN int
 121 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
 122     int argc __unused, const char *argv[] __unused)
 123 {
 124
 125         return (PAM_SUCCESS);
 126 }
 127
 128 PAM_EXTERN int
 129 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
 130     int argc, const char *argv[])
 131 {
 132
 133         return (_pam_echo(pamh, flags, argc, argv));
 134 }
 135
 136 PAM_EXTERN int
 137 pam_sm_open_session(pam_handle_t *pamh, int flags,
 138     int argc, const char *argv[])
 139 {
 140
 141         return (_pam_echo(pamh, flags, argc, argv));
 142 }
 143
 144 PAM_EXTERN int
 145 pam_sm_close_session(pam_handle_t *pamh, int flags,
 146     int argc, const char *argv[])
 147 {
 148
 149         return (_pam_echo(pamh, flags, argc, argv));
 150 }
 151
 152 PAM_EXTERN int
 153 pam_sm_chauthtok(pam_handle_t *pamh, int flags,
 154     int argc, const char *argv[])
 155 {
 156
 157         if (flags & PAM_PRELIM_CHECK)
 158                 return (PAM_SUCCESS);
 159         return (_pam_echo(pamh, flags, argc, argv));
 160 }
 161
 162 PAM_MODULE_ENTRY("pam_echo");