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 __FBSDID("$FreeBSD$");
39
40 #include <sys/param.h>
41
42 #include <err.h>
43 #include <pwd.h>
44 #include <stdio.h>
45 #include <stdlib.h>
46 #include <syslog.h>
47 #include <unistd.h>
48
49 #include <security/pam_appl.h>
50 #include <security/openpam.h>
51
52 static pam_handle_t *pamh;
53 static struct pam_conv pamc = {
54 openpam_ttyconv,
55 NULL
56 };
57
58 static char *yp_domain;
59 static char *yp_host;
60
61 static void
usage(void)62 usage(void)
63 {
64 fprintf(stderr, "usage: passwd [-ly] [-d domain] [-h host] [user]\n");
65 exit(1);
66 }
67
68 int
main(int argc,char * argv[])69 main(int argc, char *argv[])
70 {
71 char hostname[MAXHOSTNAMELEN];
72 struct passwd *pwd = NULL; /* Keep compiler happy. */
73 int o, pam_err;
74 uid_t uid;
75
76 while ((o = getopt(argc, argv, "d:h:loy")) != -1)
77 switch (o) {
78 case 'd':
79 yp_domain = optarg;
80 break;
81 case 'h':
82 yp_host = optarg;
83 break;
84 case 'l':
85 case 'o':
86 case 'y':
87 /* compatibility */
88 break;
89 default:
90 usage();
91 }
92
93 argc -= optind;
94 argv += optind;
95
96 uid = getuid();
97
98 switch (argc) {
99 case 0:
100 if ((pwd = getpwuid(uid)) == NULL)
101 errx(1, "who are you?");
102 break;
103 case 1:
104 if ((pwd = getpwnam(*argv)) == NULL)
105 errx(1, "%s: no such user", *argv);
106 break;
107 default:
108 usage();
109 }
110
111 if (uid != 0 && uid != pwd->pw_uid)
112 errx(1, "permission denied");
113
114 /* check where the user's from */
115 switch (pwd->pw_fields & _PWF_SOURCE) {
116 case _PWF_FILES:
117 fprintf(stderr, "Changing local password for %s\n",
118 pwd->pw_name);
119 break;
120 case _PWF_NIS:
121 fprintf(stderr, "Changing NIS password for %s\n",
122 pwd->pw_name);
123 break;
124 default:
125 /* XXX: Green men ought to be supported via PAM. */
126 errx(1,
127 "Sorry, `passwd' can only change passwords for local or NIS users.");
128 }
129
130 #define pam_check(func) do { \
131 if (pam_err != PAM_SUCCESS) { \
132 if (pam_err == PAM_AUTH_ERR || pam_err == PAM_PERM_DENIED || \
133 pam_err == PAM_AUTHTOK_RECOVERY_ERR) \
134 warnx("sorry"); \
135 else \
136 warnx("%s(): %s", func, pam_strerror(pamh, pam_err)); \
137 goto end; \
138 } \
139 } while (0)
140
141 /* initialize PAM */
142 pam_err = pam_start("passwd", pwd->pw_name, &pamc, &pamh);
143 pam_check("pam_start");
144
145 pam_err = pam_set_item(pamh, PAM_TTY, ttyname(STDERR_FILENO));
146 pam_check("pam_set_item");
147 gethostname(hostname, sizeof hostname);
148 pam_err = pam_set_item(pamh, PAM_RHOST, hostname);
149 pam_check("pam_set_item");
150 pam_err = pam_set_item(pamh, PAM_RUSER, getlogin());
151 pam_check("pam_set_item");
152
153 /* set YP domain and host */
154 pam_err = pam_set_data(pamh, "yp_domain", yp_domain, NULL);
155 pam_check("pam_set_data");
156 pam_err = pam_set_data(pamh, "yp_server", yp_host, NULL);
157 pam_check("pam_set_data");
158
159 /* set new password */
160 pam_err = pam_chauthtok(pamh, 0);
161 pam_check("pam_chauthtok");
162
163 end:
164 pam_end(pamh, pam_err);
165 exit(pam_err == PAM_SUCCESS ? 0 : 1);
166 }
167