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 44void copyfile(int, int, struct stat *); 45__dead void usage(void); 46 47int 48main(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 104void 105copyfile(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 126usage(void) 127{ 128 extern char *__progname; 129 130 (void)fprintf(stderr, "usage: %s\n", __progname); 131 exit(1); 132} 133