1 /* $OpenBSD: vipw.c,v 1.27 2023/08/11 04:45:05 guenther Exp $ */
2
3 /*
4 * Copyright (c) 1987, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/time.h>
33 #include <sys/stat.h>
34
35 #include <err.h>
36 #include <fcntl.h>
37 #include <paths.h>
38 #include <pwd.h>
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <unistd.h>
42 #include <util.h>
43
44 void copyfile(int, int, struct stat *);
45 __dead void usage(void);
46
47 int
main(int argc,char * argv[])48 main(int argc, char *argv[])
49 {
50 int pfd, tfd;
51 struct stat begin, end;
52 int ch;
53
54 while ((ch = getopt(argc, argv, "")) != -1) {
55 switch (ch) {
56 default:
57 usage();
58 }
59 }
60 argc -= optind;
61 argv += optind;
62
63 if (argc != 0)
64 usage();
65
66 if (unveil(_PATH_MASTERPASSWD_LOCK, "rwc") == -1)
67 err(1, "unveil %s", _PATH_MASTERPASSWD_LOCK);
68 if (unveil(_PATH_MASTERPASSWD, "r") == -1)
69 err(1, "unveil %s", _PATH_MASTERPASSWD);
70 if (unveil(_PATH_BSHELL, "x") == -1)
71 err(1, "unveil %s", _PATH_BSHELL);
72 if (unveil(_PATH_PWD_MKDB, "x") == -1)
73 err(1, "unveil %s", _PATH_PWD_MKDB);
74 if (pledge("stdio rpath wpath cpath fattr proc exec", NULL) == -1)
75 err(1, "pledge");
76
77 pw_init();
78 tfd = pw_lock(0);
79 if (tfd == -1)
80 errx(1, "the passwd file is busy or you cannot lock.");
81 pfd = open(_PATH_MASTERPASSWD, O_RDONLY);
82 if (pfd == -1)
83 pw_error(_PATH_MASTERPASSWD, 1, 1);
84 copyfile(pfd, tfd, &begin);
85 (void)close(tfd);
86
87 for (;;) {
88 pw_edit(0, NULL);
89 if (stat(_PATH_MASTERPASSWD_LOCK, &end))
90 pw_error(_PATH_MASTERPASSWD_LOCK, 1, 1);
91 if (timespeccmp(&begin.st_mtim, &end.st_mtim, ==) &&
92 begin.st_size == end.st_size) {
93 warnx("no changes made");
94 pw_error((char *)NULL, 0, 0);
95 }
96 if (pw_mkdb(NULL, 0) == 0)
97 break;
98 pw_prompt();
99 }
100
101 return 0;
102 }
103
104 void
copyfile(int from,int to,struct stat * sb)105 copyfile(int from, int to, struct stat *sb)
106 {
107 int nr, nw, off;
108 char buf[8*1024];
109 struct timespec ts[2];
110
111 if (fstat(from, sb) == -1)
112 pw_error(_PATH_MASTERPASSWD, 1, 1);
113 while ((nr = read(from, buf, sizeof(buf))) > 0)
114 for (off = 0; nr > 0; nr -= nw, off += nw)
115 if ((nw = write(to, buf + off, nr)) == -1)
116 pw_error(_PATH_MASTERPASSWD_LOCK, 1, 1);
117 if (nr == -1)
118 pw_error(_PATH_MASTERPASSWD, 1, 1);
119
120 ts[0] = sb->st_atim;
121 ts[1] = sb->st_mtim;
122 (void)futimens(to, ts);
123 }
124
125 __dead void
usage(void)126 usage(void)
127 {
128 extern char *__progname;
129
130 (void)fprintf(stderr, "usage: %s\n", __progname);
131 exit(1);
132 }
133