lib/pam_module/pam_echo/pam_echo.c

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