1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
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 * $FreeBSD: head/lib/libpam/modules/pam_echo/pam_echo.c 326219 2017-11-26 02:00:33Z pfg $
37 */
38
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <string.h>
42
43 #include <security/pam_appl.h>
44 #include <security/pam_modules.h>
45 #include <security/openpam.h>
46
47 static int
_pam_echo(pam_handle_t * pamh,int flags,int argc,const char * argv[])48 _pam_echo(pam_handle_t *pamh, int flags,
49 int argc, const char *argv[])
50 {
51 char msg[PAM_MAX_MSG_SIZE];
52 const void *str;
53 const char *p, *q;
54 int err, i, item;
55 size_t len;
56
57 if (flags & PAM_SILENT)
58 return (PAM_SUCCESS);
59 for (i = 0, len = 0; i < argc && len < sizeof(msg) - 1; ++i) {
60 if (i > 0)
61 msg[len++] = ' ';
62 for (p = argv[i]; *p != '\0' && len < sizeof(msg) - 1; ++p) {
63 if (*p != '%' || p[1] == '\0') {
64 msg[len++] = *p;
65 continue;
66 }
67 switch (*++p) {
68 case 'H':
69 item = PAM_RHOST;
70 break;
71 case 'h':
72 /* not implemented */
73 item = -1;
74 break;
75 case 's':
76 item = PAM_SERVICE;
77 break;
78 case 't':
79 item = PAM_TTY;
80 break;
81 case 'U':
82 item = PAM_RUSER;
83 break;
84 case 'u':
85 item = PAM_USER;
86 break;
87 default:
88 item = -1;
89 msg[len++] = *p;
90 break;
91 }
92 if (item == -1)
93 continue;
94 err = pam_get_item(pamh, item, &str);
95 if (err != PAM_SUCCESS)
96 return (err);
97 if (str == NULL)
98 str = "(null)";
99 for (q = str; *q != '\0' && len < sizeof(msg) - 1; ++q)
100 msg[len++] = *q;
101 }
102 }
103 msg[len] = '\0';
104 return (pam_info(pamh, "%s", msg));
105 }
106
107 PAM_EXTERN int
pam_sm_authenticate(pam_handle_t * pamh,int flags,int argc,const char * argv[])108 pam_sm_authenticate(pam_handle_t *pamh, int flags,
109 int argc, const char *argv[])
110 {
111
112 return (_pam_echo(pamh, flags, argc, argv));
113 }
114
115 PAM_EXTERN int
pam_sm_setcred(pam_handle_t * pamh __unused,int flags __unused,int argc __unused,const char * argv[]__unused)116 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
117 int argc __unused, const char *argv[] __unused)
118 {
119
120 return (PAM_SUCCESS);
121 }
122
123 PAM_EXTERN int
pam_sm_acct_mgmt(pam_handle_t * pamh,int flags,int argc,const char * argv[])124 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
125 int argc, const char *argv[])
126 {
127
128 return (_pam_echo(pamh, flags, argc, argv));
129 }
130
131 PAM_EXTERN int
pam_sm_open_session(pam_handle_t * pamh,int flags,int argc,const char * argv[])132 pam_sm_open_session(pam_handle_t *pamh, int flags,
133 int argc, const char *argv[])
134 {
135
136 return (_pam_echo(pamh, flags, argc, argv));
137 }
138
139 PAM_EXTERN int
pam_sm_close_session(pam_handle_t * pamh,int flags,int argc,const char * argv[])140 pam_sm_close_session(pam_handle_t *pamh, int flags,
141 int argc, const char *argv[])
142 {
143
144 return (_pam_echo(pamh, flags, argc, argv));
145 }
146
147 PAM_EXTERN int
pam_sm_chauthtok(pam_handle_t * pamh,int flags,int argc,const char * argv[])148 pam_sm_chauthtok(pam_handle_t *pamh, int flags,
149 int argc, const char *argv[])
150 {
151
152 if (flags & PAM_PRELIM_CHECK)
153 return (PAM_SUCCESS);
154 return (_pam_echo(pamh, flags, argc, argv));
155 }
156
157 PAM_MODULE_ENTRY("pam_echo");
158