chpass/chpass.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-4-Clause
   3  *
   4  * Copyright (c) 1988, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  * Copyright (c) 2002 Networks Associates Technology, Inc.
   7  * All rights reserved.
   8  *
   9  * Portions of this software were developed for the FreeBSD Project by
  10  * ThinkSec AS and NAI Labs, the Security Research Division of Network
  11  * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
  12  * ("CBOSS"), as part of the DARPA CHATS research program.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  * 3. All advertising materials mentioning features or use of this software
  23  *    must display the following acknowledgement:
  24  *      This product includes software developed by the University of
  25  *      California, Berkeley and its contributors.
  26  * 4. Neither the name of the University nor the names of its contributors
  27  *    may be used to endorse or promote products derived from this software
  28  *    without specific prior written permission.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  31  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  32  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  34  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  35  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  36  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  37  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  38  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  39  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  40  * SUCH DAMAGE.
  41  */
  42
  43 #if 0
  44 #ifndef lint
  45 static const char copyright[] =
  46 "@(#) Copyright (c) 1988, 1993, 1994\n\
  47         The Regents of the University of California.  All rights reserved.\n";
  48 #endif /* not lint */
  49
  50 #ifndef lint
  51 static char sccsid[] = "@(#)chpass.c    8.4 (Berkeley) 4/2/94";
  52 #endif /* not lint */
  53 #endif
  54 #include <sys/cdefs.h>
  55 __FBSDID("$FreeBSD$");
  56
  57 #include <sys/param.h>
  58
  59 #include <err.h>
  60 #include <errno.h>
  61 #include <pwd.h>
  62 #include <stdio.h>
  63 #include <stdlib.h>
  64 #include <string.h>
  65 #include <unistd.h>
  66 #ifdef YP
  67 #include <ypclnt.h>
  68 #endif
  69
  70 #include <pw_scan.h>
  71 #include <libutil.h>
  72 #include <crypt.h>
  73
  74 #include "chpass.h"
  75
  76 int master_mode;
  77
  78 static void     baduser(void);
  79 static void     usage(void);
  80
  81 int
  82 main(int argc, char *argv[])
  83 {
  84         enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW, NEWEXP } op;
  85         struct passwd lpw, *old_pw, *pw;
  86         int ch, pfd, tfd;
  87         const char *password;
  88         char *arg = NULL, *cryptpw;
  89         uid_t uid;
  90 #ifdef YP
  91         struct ypclnt *ypclnt;
  92         const char *yp_domain = NULL, *yp_host = NULL;
  93 #endif
  94
  95         pw = old_pw = NULL;
  96         op = EDITENTRY;
  97 #ifdef YP
  98         while ((ch = getopt(argc, argv, "a:p:s:e:d:h:loy")) != -1)
  99 #else
 100         while ((ch = getopt(argc, argv, "a:p:s:e:")) != -1)
 101 #endif
 102                 switch (ch) {
 103                 case 'a':
 104                         op = LOADENTRY;
 105                         arg = optarg;
 106                         break;
 107                 case 's':
 108                         op = NEWSH;
 109                         arg = optarg;
 110                         break;
 111                 case 'p':
 112                         op = NEWPW;
 113                         arg = optarg;
 114                         break;
 115                 case 'e':
 116                         op = NEWEXP;
 117                         arg = optarg;
 118                         break;
 119 #ifdef YP
 120                 case 'd':
 121                         yp_domain = optarg;
 122                         break;
 123                 case 'h':
 124                         yp_host = optarg;
 125                         break;
 126                 case 'l':
 127                 case 'o':
 128                 case 'y':
 129                         /* compatibility */
 130                         break;
 131 #endif
 132                 case '?':
 133                 default:
 134                         usage();
 135                 }
 136
 137         argc -= optind;
 138         argv += optind;
 139
 140         if (argc > 1)
 141                 usage();
 142
 143         uid = getuid();
 144
 145         if (op == EDITENTRY || op == NEWSH || op == NEWPW || op == NEWEXP) {
 146                 if (argc == 0) {
 147                         if ((pw = getpwuid(uid)) == NULL)
 148                                 errx(1, "unknown user: uid %lu",
 149                                     (unsigned long)uid);
 150                 } else {
 151                         if ((pw = getpwnam(*argv)) == NULL)
 152                                 errx(1, "unknown user: %s", *argv);
 153                         if (uid != 0 && uid != pw->pw_uid)
 154                                 baduser();
 155                 }
 156
 157                 /* Make a copy for later verification */
 158                 if ((pw = pw_dup(pw)) == NULL ||
 159                     (old_pw = pw_dup(pw)) == NULL)
 160                         err(1, "pw_dup");
 161         }
 162
 163 #ifdef YP
 164         if (pw != NULL && (pw->pw_fields & _PWF_SOURCE) == _PWF_NIS) {
 165                 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
 166                 master_mode = (ypclnt != NULL &&
 167                     ypclnt_connect(ypclnt) != -1 &&
 168                     ypclnt_havepasswdd(ypclnt) == 1);
 169                 ypclnt_free(ypclnt);
 170         } else
 171 #endif
 172         master_mode = (uid == 0);
 173
 174         if (op == NEWSH) {
 175                 /* protect p_shell -- it thinks NULL is /bin/sh */
 176                 if (!arg[0])
 177                         usage();
 178                 if (p_shell(arg, pw, (ENTRY *)NULL) == -1)
 179                         exit(1);
 180         }
 181
 182         if (op == NEWEXP) {
 183                 if (uid)        /* only root can change expire */
 184                         baduser();
 185                 if (p_expire(arg, pw, (ENTRY *)NULL) == -1)
 186                         exit(1);
 187         }
 188
 189         if (op == LOADENTRY) {
 190                 if (uid)
 191                         baduser();
 192                 pw = &lpw;
 193                 old_pw = NULL;
 194                 if (!__pw_scan(arg, pw, _PWSCAN_WARN|_PWSCAN_MASTER))
 195                         exit(1);
 196         }
 197
 198         if (op == NEWPW) {
 199                 if (uid)
 200                         baduser();
 201
 202                 if (strchr(arg, ':'))
 203                         errx(1, "invalid format for password");
 204                 pw->pw_passwd = arg;
 205         }
 206
 207         if (op == EDITENTRY) {
 208                 /*
 209                  * We don't really need pw_*() here, but pw_edit() (used
 210                  * by edit()) is just too useful...
 211                  */
 212                 if (pw_init(NULL, NULL))
 213                         err(1, "pw_init()");
 214                 if ((tfd = pw_tmp(-1)) == -1) {
 215                         pw_fini();
 216                         err(1, "pw_tmp()");
 217                 }
 218                 free(pw);
 219                 pw = edit(pw_tempname(), old_pw);
 220                 pw_fini();
 221                 if (pw == NULL)
 222                         err(1, "edit()");
 223                 /*
 224                  * pw_equal does not check for crypted passwords, so we
 225                  * should do it explicitly
 226                  */
 227                 if (pw_equal(old_pw, pw) &&
 228                     strcmp(old_pw->pw_passwd, pw->pw_passwd) == 0)
 229                         errx(0, "user information unchanged");
 230         }
 231
 232         if (old_pw && !master_mode) {
 233                 password = getpass("Password: ");
 234                 cryptpw = crypt(password, old_pw->pw_passwd);
 235                 if (cryptpw == NULL || strcmp(cryptpw, old_pw->pw_passwd) != 0)
 236                         baduser();
 237         } else {
 238                 password = "";
 239         }
 240
 241         if (pw_init(NULL, NULL))
 242                 err(1, "pw_init()");
 243         if ((pfd = pw_lock()) == -1) {
 244                 pw_fini();
 245                 err(1, "pw_lock()");
 246         }
 247         if ((tfd = pw_tmp(-1)) == -1) {
 248                 pw_fini();
 249                 err(1, "pw_tmp()");
 250         }
 251         if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
 252                 pw_fini();
 253                 err(1, "pw_copy");
 254         }
 255         if (pw_mkdb(pw->pw_name) == -1) {
 256                 pw_fini();
 257                 err(1, "pw_mkdb()");
 258         }
 259         pw_fini();
 260         errx(0, "user information updated");
 261 }
 262
 263 static void
 264 baduser(void)
 265 {
 266
 267         errx(1, "%s", strerror(EACCES));
 268 }
 269
 270 static void
 271 usage(void)
 272 {
 273
 274         (void)fprintf(stderr,
 275             "usage: chpass%s %s [user]\n",
 276 #ifdef YP
 277             " [-d domain] [-h host]",
 278 #else
 279             "",
 280 #endif
 281             "[-a list] [-p encpass] [-s shell] [-e mmm dd yy]");
 282         exit(1);
 283 }