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