chpass.c revision 5628
1/*- 2 * Copyright (c) 1988, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifndef lint 35static char copyright[] = 36"@(#) Copyright (c) 1988, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41static char sccsid[] = "From: @(#)chpass.c 8.4 (Berkeley) 4/2/94"; 42static char rcsid[] = 43 "$Id$"; 44#endif /* not lint */ 45 46#include <sys/param.h> 47#include <sys/stat.h> 48#include <sys/signal.h> 49#include <sys/time.h> 50#include <sys/resource.h> 51 52#include <ctype.h> 53#include <err.h> 54#include <errno.h> 55#include <fcntl.h> 56#include <pwd.h> 57#include <stdio.h> 58#include <stdlib.h> 59#include <string.h> 60#include <unistd.h> 61 62#include <pw_scan.h> 63#include <pw_util.h> 64#include "pw_copy.h" 65 66#include "chpass.h" 67#include "pathnames.h" 68 69char *progname = "chpass"; 70char *tempname; 71uid_t uid; 72 73void baduser __P((void)); 74void usage __P((void)); 75 76int 77main(argc, argv) 78 int argc; 79 char **argv; 80{ 81 enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW } op; 82 struct passwd *pw, lpw; 83 int ch, pfd, tfd; 84 char *arg; 85 86 op = EDITENTRY; 87 while ((ch = getopt(argc, argv, "a:p:s:")) != EOF) 88 switch(ch) { 89 case 'a': 90 op = LOADENTRY; 91 arg = optarg; 92 break; 93 case 's': 94 op = NEWSH; 95 arg = optarg; 96 break; 97 case 'p': 98 op = NEWPW; 99 arg = optarg; 100 break; 101 case '?': 102 default: 103 usage(); 104 } 105 argc -= optind; 106 argv += optind; 107 108 uid = getuid(); 109 110 if (op == EDITENTRY || op == NEWSH || op == NEWPW) 111 switch(argc) { 112 case 0: 113 if (!(pw = getpwuid(uid))) 114 errx(1, "unknown user: uid %u", uid); 115 break; 116 case 1: 117 if (!(pw = getpwnam(*argv))) 118 errx(1, "unknown user: %s", *argv); 119 if (uid && uid != pw->pw_uid) 120 baduser(); 121 break; 122 default: 123 usage(); 124 } 125 126 if (op == NEWSH) { 127 /* protect p_shell -- it thinks NULL is /bin/sh */ 128 if (!arg[0]) 129 usage(); 130 if (p_shell(arg, pw, (ENTRY *)NULL)) 131 pw_error((char *)NULL, 0, 1); 132 } 133 134 if (op == LOADENTRY) { 135 if (uid) 136 baduser(); 137 pw = &lpw; 138 if (!pw_scan(arg, pw)) 139 exit(1); 140 } 141 142 if (op == NEWPW) { 143 if (uid) 144 baduser(); 145 146 if(strchr(arg, ':')) { 147 errx(1, "invalid format for password"); 148 } 149 pw->pw_passwd = arg; 150 } 151 152 /* 153 * The temporary file/file descriptor usage is a little tricky here. 154 * 1: We start off with two fd's, one for the master password 155 * file (used to lock everything), and one for a temporary file. 156 * 2: Display() gets an fp for the temporary file, and copies the 157 * user's information into it. It then gives the temporary file 158 * to the user and closes the fp, closing the underlying fd. 159 * 3: The user edits the temporary file some number of times. 160 * 4: Verify() gets an fp for the temporary file, and verifies the 161 * contents. It can't use an fp derived from the step #2 fd, 162 * because the user's editor may have created a new instance of 163 * the file. Once the file is verified, its contents are stored 164 * in a password structure. The verify routine closes the fp, 165 * closing the underlying fd. 166 * 5: Delete the temporary file. 167 * 6: Get a new temporary file/fd. Pw_copy() gets an fp for it 168 * file and copies the master password file into it, replacing 169 * the user record with a new one. We can't use the first 170 * temporary file for this because it was owned by the user. 171 * Pw_copy() closes its fp, flushing the data and closing the 172 * underlying file descriptor. We can't close the master 173 * password fp, or we'd lose the lock. 174 * 7: Call pw_mkdb() (which renames the temporary file) and exit. 175 * The exit closes the master passwd fp/fd. 176 */ 177 pw_init(); 178 pfd = pw_lock(); 179 tfd = pw_tmp(); 180 181 if (op == EDITENTRY) { 182 display(tfd, pw); 183 edit(pw); 184 (void)unlink(tempname); 185 tfd = pw_tmp(); 186 } 187 188 pw_copy(pfd, tfd, pw); 189 190 if (!pw_mkdb()) 191 pw_error((char *)NULL, 0, 1); 192 exit(0); 193} 194 195void 196baduser() 197{ 198 errx(1, "%s", strerror(EACCES)); 199} 200 201void 202usage() 203{ 204 205 (void)fprintf(stderr, 206 "usage: chpass [-a list] [-p encpass] [-s shell] [user]\n"); 207 exit(1); 208} 209