1/*-
2 * Copyright (c) 2002 Networks Associates Technologies, Inc.
3 * All rights reserved.
4 *
5 * This software was developed for the FreeBSD Project by ThinkSec AS and
6 * NAI Labs, the Security Research Division of Network Associates, Inc.
7 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
8 * DARPA CHATS research program.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote
19 *    products derived from this software without specific prior written
20 *    permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD$");
37
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
50static pam_handle_t *pamh;
51static struct pam_conv pamc = {
52	openpam_ttyconv,
53	NULL
54};
55
56static char	*yp_domain;
57static char	*yp_host;
58
59static void
60usage(void)
61{
62	fprintf(stderr, "usage: passwd [-ly] [-d domain] [-h host] [user]\n");
63	exit(1);
64}
65
66int
67main(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