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
  73 #include "chpass.h"
  74
  75 int master_mode;
  76
  77 static void     baduser(void);
  78 static void     usage(void);
  79
  80 int
  81 main(int argc, char *argv[])
  82 {
  83         enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW, NEWEXP } op;
  84         struct passwd lpw, *old_pw, *pw;
  85         int ch, pfd, tfd;
  86         const char *password;
  87         char *arg = NULL, *cryptpw;
  88         uid_t uid;
  89 #ifdef YP
  90         struct ypclnt *ypclnt;
  91         const char *yp_domain = NULL, *yp_host = NULL;
  92 #endif
  93
  94         pw = old_pw = NULL;
  95         op = EDITENTRY;
  96 #ifdef YP
  97         while ((ch = getopt(argc, argv, "a:p:s:e:d:h:loy")) != -1)
  98 #else
  99         while ((ch = getopt(argc, argv, "a:p:s:e:")) != -1)
 100 #endif
 101                 switch (ch) {
 102                 case 'a':
 103                         op = LOADENTRY;
 104                         arg = optarg;
 105                         break;
 106                 case 's':
 107                         op = NEWSH;
 108                         arg = optarg;
 109                         break;
 110                 case 'p':
 111                         op = NEWPW;
 112                         arg = optarg;
 113                         break;
 114                 case 'e':
 115                         op = NEWEXP;
 116                         arg = optarg;
 117                         break;
 118 #ifdef YP
 119                 case 'd':
 120                         yp_domain = optarg;
 121                         break;
 122                 case 'h':
 123                         yp_host = optarg;
 124                         break;
 125                 case 'l':
 126                 case 'o':
 127                 case 'y':
 128                         /* compatibility */
 129                         break;
 130 #endif
 131                 case '?':
 132                 default:
 133                         usage();
 134                 }
 135
 136         argc -= optind;
 137         argv += optind;
 138
 139         if (argc > 1)
 140                 usage();
 141
 142         uid = getuid();
 143
 144         if (op == EDITENTRY || op == NEWSH || op == NEWPW || op == NEWEXP) {
 145                 if (argc == 0) {
 146                         if ((pw = getpwuid(uid)) == NULL)
 147                                 errx(1, "unknown user: uid %lu",
 148                                     (unsigned long)uid);
 149                 } else {
 150                         if ((pw = getpwnam(*argv)) == NULL)
 151                                 errx(1, "unknown user: %s", *argv);
 152                         if (uid != 0 && uid != pw->pw_uid)
 153                                 baduser();
 154                 }
 155
 156                 /* Make a copy for later verification */
 157                 if ((pw = pw_dup(pw)) == NULL ||
 158                     (old_pw = pw_dup(pw)) == NULL)
 159                         err(1, "pw_dup");
 160         }
 161
 162 #ifdef YP
 163         if (pw != NULL && (pw->pw_fields & _PWF_SOURCE) == _PWF_NIS) {
 164                 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
 165                 master_mode = (ypclnt != NULL &&
 166                     ypclnt_connect(ypclnt) != -1 &&
 167                     ypclnt_havepasswdd(ypclnt) == 1);
 168                 ypclnt_free(ypclnt);
 169         } else
 170 #endif
 171         master_mode = (uid == 0);
 172
 173         if (op == NEWSH) {
 174                 /* protect p_shell -- it thinks NULL is /bin/sh */
 175                 if (!arg[0])
 176                         usage();
 177                 if (p_shell(arg, pw, (ENTRY *)NULL) == -1)
 178                         exit(1);
 179         }
 180
 181         if (op == NEWEXP) {
 182                 if (uid)        /* only root can change expire */
 183                         baduser();
 184                 if (p_expire(arg, pw, (ENTRY *)NULL) == -1)
 185                         exit(1);
 186         }
 187
 188         if (op == LOADENTRY) {
 189                 if (uid)
 190                         baduser();
 191                 pw = &lpw;
 192                 old_pw = NULL;
 193                 if (!__pw_scan(arg, pw, _PWSCAN_WARN|_PWSCAN_MASTER))
 194                         exit(1);
 195         }
 196
 197         if (op == NEWPW) {
 198                 if (uid)
 199                         baduser();
 200
 201                 if (strchr(arg, ':'))
 202                         errx(1, "invalid format for password");
 203                 pw->pw_passwd = arg;
 204         }
 205
 206         if (op == EDITENTRY) {
 207                 /*
 208                  * We don't really need pw_*() here, but pw_edit() (used
 209                  * by edit()) is just too useful...
 210                  */
 211                 if (pw_init(NULL, NULL))
 212                         err(1, "pw_init()");
 213                 if ((tfd = pw_tmp(-1)) == -1) {
 214                         pw_fini();
 215                         err(1, "pw_tmp()");
 216                 }
 217                 free(pw);
 218                 pw = edit(pw_tempname(), old_pw);
 219                 pw_fini();
 220                 if (pw == NULL)
 221                         err(1, "edit()");
 222                 /*
 223                  * pw_equal does not check for crypted passwords, so we
 224                  * should do it explicitly
 225                  */
 226                 if (pw_equal(old_pw, pw) &&
 227                     strcmp(old_pw->pw_passwd, pw->pw_passwd) == 0)
 228                         errx(0, "user information unchanged");
 229         }
 230
 231         if (old_pw && !master_mode) {
 232                 password = getpass("Password: ");
 233                 cryptpw = crypt(password, old_pw->pw_passwd);
 234                 if (cryptpw == NULL || strcmp(cryptpw, old_pw->pw_passwd) != 0)
 235                         baduser();
 236         } else {
 237                 password = "";
 238         }
 239
 240         if (old_pw != NULL)
 241                 pw->pw_fields |= (old_pw->pw_fields & _PWF_SOURCE);
 242         switch (pw->pw_fields & _PWF_SOURCE) {
 243 #ifdef YP
 244         case _PWF_NIS:
 245                 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
 246                 if (ypclnt == NULL) {
 247                         warnx("ypclnt_new failed");
 248                         exit(1);
 249                 }
 250                 if (ypclnt_connect(ypclnt) == -1 ||
 251                     ypclnt_passwd(ypclnt, pw, password) == -1) {
 252                         warnx("%s", ypclnt->error);
 253                         ypclnt_free(ypclnt);
 254                         exit(1);
 255                 }
 256                 ypclnt_free(ypclnt);
 257                 errx(0, "NIS user information updated");
 258 #endif /* YP */
 259         case 0:
 260         case _PWF_FILES:
 261                 if (pw_init(NULL, NULL))
 262                         err(1, "pw_init()");
 263                 if ((pfd = pw_lock()) == -1) {
 264                         pw_fini();
 265                         err(1, "pw_lock()");
 266                 }
 267                 if ((tfd = pw_tmp(-1)) == -1) {
 268                         pw_fini();
 269                         err(1, "pw_tmp()");
 270                 }
 271                 if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
 272                         pw_fini();
 273                         err(1, "pw_copy");
 274                 }
 275                 if (pw_mkdb(pw->pw_name) == -1) {
 276                         pw_fini();
 277                         err(1, "pw_mkdb()");
 278                 }
 279                 pw_fini();
 280                 errx(0, "user information updated");
 281                 break;
 282         default:
 283                 errx(1, "unsupported passwd source");
 284         }
 285 }
 286
 287 static void
 288 baduser(void)
 289 {
 290
 291         errx(1, "%s", strerror(EACCES));
 292 }
 293
 294 static void
 295 usage(void)
 296 {
 297
 298         (void)fprintf(stderr,
 299             "usage: chpass%s %s [user]\n",
 300 #ifdef YP
 301             " [-d domain] [-h host]",
 302 #else
 303             "",
 304 #endif
 305             "[-a list] [-p encpass] [-s shell] [-e mmm dd yy]");
 306         exit(1);
 307 }