1 /* $NetBSD: pam_echo.c,v 1.2 2004/12/12 08:18:44 christos Exp $ */
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: pam_echo.c,v 1.2 2004/12/12 08:18:44 christos Exp $");
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
_pam_echo(pam_handle_t * pamh,int flags,int argc,const char * argv[])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
pam_sm_authenticate(pam_handle_t * pamh,int flags,int argc,const char * argv[])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
pam_sm_setcred(pam_handle_t * pamh __unused,int flags __unused,int argc __unused,const char * argv[]__unused)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
pam_sm_acct_mgmt(pam_handle_t * pamh,int flags,int argc,const char * argv[])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
pam_sm_open_session(pam_handle_t * pamh,int flags,int argc,const char * argv[])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
pam_sm_close_session(pam_handle_t * pamh,int flags,int argc,const char * argv[])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
pam_sm_chauthtok(pam_handle_t * pamh,int flags,int argc,const char * argv[])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");
163