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1 /*-
2  * Copyright (c) 1988, 1993, 1994
3  *      The Regents of the University of California.  All rights reserved.
4  * Copyright (c) 2002 Networks Associates Technology, Inc.
5  * All rights reserved.
6  *
7  * Portions of this software were developed for the FreeBSD Project by
8  * ThinkSec AS and NAI Labs, the Security Research Division of Network
9  * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
10  * ("CBOSS"), as part of the 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. All advertising materials mentioning features or use of this software
21  *    must display the following acknowledgement:
22  *      This product includes software developed by the University of
23  *      California, Berkeley and its contributors.
24  * 4. Neither the name of the University nor the names of its contributors
25  *    may be used to endorse or promote products derived from this software
26  *    without specific prior written permission.
27  *
28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38  * SUCH DAMAGE.
39  */
40
41 #if 0
42 #ifndef lint
43 static const char copyright[] =
44 "@(#) Copyright (c) 1988, 1993, 1994\n\
45         The Regents of the University of California.  All rights reserved.\n";
46 #endif /* not lint */
47
48 #ifndef lint
49 static char sccsid[] = "@(#)chpass.c    8.4 (Berkeley) 4/2/94";
50 #endif /* not lint */
51 #endif
52 #include <sys/cdefs.h>
53 __FBSDID("$FreeBSD$");
54
55 #include <sys/param.h>
56
57 #include <err.h>
58 #include <errno.h>
59 #include <pwd.h>
60 #include <stdio.h>
61 #include <stdlib.h>
62 #include <string.h>
63 #include <unistd.h>
64 #ifdef YP
65 #include <ypclnt.h>
66 #endif
67
68 #include <pw_scan.h>
69 #include <libutil.h>
70
71 #include "chpass.h"
72
73 int master_mode;
74
75 static void     baduser(void);
76 static void     usage(void);
77
78 int
79 main(int argc, char *argv[])
80 {
81         enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW, NEWEXP } op;
82         struct passwd lpw, *old_pw, *pw;
83         int ch, pfd, tfd;
84         const char *password;
85         char *arg = NULL;
86         uid_t uid;
87 #ifdef YP
88         struct ypclnt *ypclnt;
89         const char *yp_domain = NULL, *yp_host = NULL;
90 #endif
91
92         pw = old_pw = NULL;
93         op = EDITENTRY;
94 #ifdef YP
95         while ((ch = getopt(argc, argv, "a:p:s:e:d:h:loy")) != -1)
96 #else
97         while ((ch = getopt(argc, argv, "a:p:s:e:")) != -1)
98 #endif
99                 switch (ch) {
100                 case 'a':
101                         op = LOADENTRY;
102                         arg = optarg;
103                         break;
104                 case 's':
105                         op = NEWSH;
106                         arg = optarg;
107                         break;
108                 case 'p':
109                         op = NEWPW;
110                         arg = optarg;
111                         break;
112                 case 'e':
113                         op = NEWEXP;
114                         arg = optarg;
115                         break;
116 #ifdef YP
117                 case 'd':
118                         yp_domain = optarg;
119                         break;
120                 case 'h':
121                         yp_host = optarg;
122                         break;
123                 case 'l':
124                 case 'o':
125                 case 'y':
126                         /* compatibility */
127                         break;
128 #endif
129                 case '?':
130                 default:
131                         usage();
132                 }
133
134         argc -= optind;
135         argv += optind;
136
137         if (argc > 1)
138                 usage();
139
140         uid = getuid();
141
142         if (op == EDITENTRY || op == NEWSH || op == NEWPW || op == NEWEXP) {
143                 if (argc == 0) {
144                         if ((pw = getpwuid(uid)) == NULL)
145                                 errx(1, "unknown user: uid %lu",
146                                     (unsigned long)uid);
147                 } else {
148                         if ((pw = getpwnam(*argv)) == NULL)
149                                 errx(1, "unknown user: %s", *argv);
150                         if (uid != 0 && uid != pw->pw_uid)
151                                 baduser();
152                 }
153
154                 /* Make a copy for later verification */
155                 if ((pw = pw_dup(pw)) == NULL ||
156                     (old_pw = pw_dup(pw)) == NULL)
157                         err(1, "pw_dup");
158         }
159
160 #ifdef YP
161         if (pw != NULL && (pw->pw_fields & _PWF_SOURCE) == _PWF_NIS) {
162                 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
163                 master_mode = (ypclnt != NULL &&
164                     ypclnt_connect(ypclnt) != -1 &&
165                     ypclnt_havepasswdd(ypclnt) == 1);
166                 ypclnt_free(ypclnt);
167         } else
168 #endif
169         master_mode = (uid == 0);
170
171         if (op == NEWSH) {
172                 /* protect p_shell -- it thinks NULL is /bin/sh */
173                 if (!arg[0])
174                         usage();
175                 if (p_shell(arg, pw, (ENTRY *)NULL) == -1)
176                         exit(1);
177         }
178
179         if (op == NEWEXP) {
180                 if (uid)        /* only root can change expire */
181                         baduser();
182                 if (p_expire(arg, pw, (ENTRY *)NULL) == -1)
183                         exit(1);
184         }
185
186         if (op == LOADENTRY) {
187                 if (uid)
188                         baduser();
189                 pw = &lpw;
190                 old_pw = NULL;
191                 if (!__pw_scan(arg, pw, _PWSCAN_WARN|_PWSCAN_MASTER))
192                         exit(1);
193         }
194
195         if (op == NEWPW) {
196                 if (uid)
197                         baduser();
198
199                 if (strchr(arg, ':'))
200                         errx(1, "invalid format for password");
201                 pw->pw_passwd = arg;
202         }
203
204         if (op == EDITENTRY) {
205                 /*
206                  * We don't really need pw_*() here, but pw_edit() (used
207                  * by edit()) is just too useful...
208                  */
209                 if (pw_init(NULL, NULL))
210                         err(1, "pw_init()");
211                 if ((tfd = pw_tmp(-1)) == -1) {
212                         pw_fini();
213                         err(1, "pw_tmp()");
214                 }
215                 free(pw);
216                 pw = edit(pw_tempname(), old_pw);
217                 pw_fini();
218                 if (pw == NULL)
219                         err(1, "edit()");
220                 /* 
221                  * pw_equal does not check for crypted passwords, so we
222                  * should do it explicitly
223                  */
224                 if (pw_equal(old_pw, pw) && 
225                     strcmp(old_pw->pw_passwd, pw->pw_passwd) == 0)
226                         errx(0, "user information unchanged");
227         }
228
229         if (old_pw && !master_mode) {
230                 password = getpass("Password: ");
231                 if (strcmp(crypt(password, old_pw->pw_passwd),
232                     old_pw->pw_passwd) != 0)
233                         baduser();
234         } else {
235                 password = "";
236         }
237
238         if (old_pw != NULL)
239                 pw->pw_fields |= (old_pw->pw_fields & _PWF_SOURCE);
240         switch (pw->pw_fields & _PWF_SOURCE) {
241 #ifdef YP
242         case _PWF_NIS:
243                 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
244                 if (ypclnt == NULL) {
245                         warnx("ypclnt_new failed");
246                         exit(1);
247                 }
248                 if (ypclnt_connect(ypclnt) == -1 ||
249                     ypclnt_passwd(ypclnt, pw, password) == -1) {
250                         warnx("%s", ypclnt->error);
251                         ypclnt_free(ypclnt);
252                         exit(1);
253                 }
254                 ypclnt_free(ypclnt);
255                 errx(0, "NIS user information updated");
256 #endif /* YP */
257         case 0:
258         case _PWF_FILES:
259                 if (pw_init(NULL, NULL))
260                         err(1, "pw_init()");
261                 if ((pfd = pw_lock()) == -1) {
262                         pw_fini();
263                         err(1, "pw_lock()");
264                 }
265                 if ((tfd = pw_tmp(-1)) == -1) {
266                         pw_fini();
267                         err(1, "pw_tmp()");
268                 }
269                 if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
270                         pw_fini();
271                         err(1, "pw_copy");
272                 }
273                 if (pw_mkdb(pw->pw_name) == -1) {
274                         pw_fini();
275                         err(1, "pw_mkdb()");
276                 }
277                 pw_fini();
278                 errx(0, "user information updated");
279                 break;
280         default:
281                 errx(1, "unsupported passwd source");
282         }
283 }
284
285 static void
286 baduser(void)
287 {
288
289         errx(1, "%s", strerror(EACCES));
290 }
291
292 static void
293 usage(void)
294 {
295
296         (void)fprintf(stderr,
297             "usage: chpass%s %s [user]\n",
298 #ifdef YP
299             " [-d domain] [-h host]",
300 #else
301             "",
302 #endif
303             "[-a list] [-p encpass] [-s shell] [-e mmm dd yy]");
304         exit(1);
305 }