1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2002 Networks Associates Technologies, 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 <sys/param.h>
39
40 #include <err.h>
41 #include <pwd.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <syslog.h>
45 #include <unistd.h>
46
47 #include <security/pam_appl.h>
48 #include <security/openpam.h>
49
50 static pam_handle_t *pamh;
51 static struct pam_conv pamc = {
52 openpam_ttyconv,
53 NULL
54 };
55
56 static char *yp_domain;
57 static char *yp_host;
58
59 static void
usage(void)60 usage(void)
61 {
62 fprintf(stderr, "usage: passwd [-ly] [-d domain] [-h host] [user]\n");
63 exit(1);
64 }
65
66 int
main(int argc,char * argv[])67 main(int argc, char *argv[])
68 {
69 char hostname[MAXHOSTNAMELEN];
70 struct passwd *pwd = NULL; /* Keep compiler happy. */
71 int o, pam_err;
72 uid_t uid;
73
74 while ((o = getopt(argc, argv, "d:h:loy")) != -1)
75 switch (o) {
76 case 'd':
77 yp_domain = optarg;
78 break;
79 case 'h':
80 yp_host = optarg;
81 break;
82 case 'l':
83 case 'o':
84 case 'y':
85 /* compatibility */
86 break;
87 default:
88 usage();
89 }
90
91 argc -= optind;
92 argv += optind;
93
94 uid = getuid();
95
96 switch (argc) {
97 case 0:
98 if ((pwd = getpwuid(uid)) == NULL)
99 errx(1, "who are you?");
100 break;
101 case 1:
102 if ((pwd = getpwnam(*argv)) == NULL)
103 errx(1, "%s: no such user", *argv);
104 break;
105 default:
106 usage();
107 }
108
109 if (uid != 0 && uid != pwd->pw_uid)
110 errx(1, "permission denied");
111
112 /* check where the user's from */
113 switch (pwd->pw_fields & _PWF_SOURCE) {
114 case _PWF_FILES:
115 fprintf(stderr, "Changing local password for %s\n",
116 pwd->pw_name);
117 break;
118 case _PWF_NIS:
119 fprintf(stderr, "Changing NIS password for %s\n",
120 pwd->pw_name);
121 break;
122 default:
123 /* XXX: Green men ought to be supported via PAM. */
124 errx(1,
125 "Sorry, `passwd' can only change passwords for local or NIS users.");
126 }
127
128 #define pam_check(func) do { \
129 if (pam_err != PAM_SUCCESS) { \
130 if (pam_err == PAM_AUTH_ERR || pam_err == PAM_PERM_DENIED || \
131 pam_err == PAM_AUTHTOK_RECOVERY_ERR) \
132 warnx("sorry"); \
133 else \
134 warnx("%s(): %s", func, pam_strerror(pamh, pam_err)); \
135 goto end; \
136 } \
137 } while (0)
138
139 /* initialize PAM */
140 pam_err = pam_start("passwd", pwd->pw_name, &pamc, &pamh);
141 pam_check("pam_start");
142
143 pam_err = pam_set_item(pamh, PAM_TTY, ttyname(STDERR_FILENO));
144 pam_check("pam_set_item");
145 gethostname(hostname, sizeof hostname);
146 pam_err = pam_set_item(pamh, PAM_RHOST, hostname);
147 pam_check("pam_set_item");
148 pam_err = pam_set_item(pamh, PAM_RUSER, getlogin());
149 pam_check("pam_set_item");
150
151 /* set YP domain and host */
152 pam_err = pam_set_data(pamh, "yp_domain", yp_domain, NULL);
153 pam_check("pam_set_data");
154 pam_err = pam_set_data(pamh, "yp_server", yp_host, NULL);
155 pam_check("pam_set_data");
156
157 /* set new password */
158 pam_err = pam_chauthtok(pamh, 0);
159 pam_check("pam_chauthtok");
160
161 end:
162 pam_end(pamh, pam_err);
163 exit(pam_err == PAM_SUCCESS ? 0 : 1);
164 }
165