chpass/chpass.c

   1 /*-
   2  * Copyright (c) 1988, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 2002 Networks Associates Technology, Inc.
   5  * All rights reserved.
   6  *
   7  * Portions of this software were developed for the FreeBSD Project by
   8  * ThinkSec AS and NAI Labs, the Security Research Division of Network
   9  * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
  10  * ("CBOSS"), as part of the DARPA CHATS research program.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. All advertising materials mentioning features or use of this software
  21  *    must display the following acknowledgement:
  22  *      This product includes software developed by the University of
  23  *      California, Berkeley and its contributors.
  24  * 4. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  */
  40
  41 #if 0
  42 #ifndef lint
  43 static const char copyright[] =
  44 "@(#) Copyright (c) 1988, 1993, 1994\n\
  45         The Regents of the University of California.  All rights reserved.\n";
  46 #endif /* not lint */
  47
  48 #ifndef lint
  49 static char sccsid[] = "@(#)chpass.c    8.4 (Berkeley) 4/2/94";
  50 #endif /* not lint */
  51 #endif
  52 #include <sys/cdefs.h>
  53 __FBSDID("$FreeBSD$");
  54
  55 #include <sys/param.h>
  56
  57 #include <err.h>
  58 #include <errno.h>
  59 #include <pwd.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <string.h>
  63 #include <unistd.h>
  64 #ifdef YP
  65 #include <ypclnt.h>
  66 #endif
  67
  68 #include <pw_scan.h>
  69 #include <libutil.h>
  70
  71 #include "chpass.h"
  72
  73 int master_mode;
  74
  75 static void     baduser(void);
  76 static void     usage(void);
  77
  78 int
  79 main(int argc, char *argv[])
  80 {
  81         enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW, NEWEXP } op;
  82         struct passwd lpw, *old_pw, *pw;
  83         int ch, pfd, tfd;
  84         const char *password;
  85         char *arg = NULL;
  86         uid_t uid;
  87 #ifdef YP
  88         struct ypclnt *ypclnt;
  89         const char *yp_domain = NULL, *yp_host = NULL;
  90 #endif
  91
  92         pw = old_pw = NULL;
  93         op = EDITENTRY;
  94 #ifdef YP
  95         while ((ch = getopt(argc, argv, "a:p:s:e:d:h:loy")) != -1)
  96 #else
  97         while ((ch = getopt(argc, argv, "a:p:s:e:")) != -1)
  98 #endif
  99                 switch (ch) {
 100                 case 'a':
 101                         op = LOADENTRY;
 102                         arg = optarg;
 103                         break;
 104                 case 's':
 105                         op = NEWSH;
 106                         arg = optarg;
 107                         break;
 108                 case 'p':
 109                         op = NEWPW;
 110                         arg = optarg;
 111                         break;
 112                 case 'e':
 113                         op = NEWEXP;
 114                         arg = optarg;
 115                         break;
 116 #ifdef YP
 117                 case 'd':
 118                         yp_domain = optarg;
 119                         break;
 120                 case 'h':
 121                         yp_host = optarg;
 122                         break;
 123                 case 'l':
 124                 case 'o':
 125                 case 'y':
 126                         /* compatibility */
 127                         break;
 128 #endif
 129                 case '?':
 130                 default:
 131                         usage();
 132                 }
 133
 134         argc -= optind;
 135         argv += optind;
 136
 137         if (argc > 1)
 138                 usage();
 139
 140         uid = getuid();
 141
 142         if (op == EDITENTRY || op == NEWSH || op == NEWPW || op == NEWEXP) {
 143                 if (argc == 0) {
 144                         if ((pw = getpwuid(uid)) == NULL)
 145                                 errx(1, "unknown user: uid %lu",
 146                                     (unsigned long)uid);
 147                 } else {
 148                         if ((pw = getpwnam(*argv)) == NULL)
 149                                 errx(1, "unknown user: %s", *argv);
 150                         if (uid != 0 && uid != pw->pw_uid)
 151                                 baduser();
 152                 }
 153
 154                 /* Make a copy for later verification */
 155                 if ((pw = pw_dup(pw)) == NULL ||
 156                     (old_pw = pw_dup(pw)) == NULL)
 157                         err(1, "pw_dup");
 158         }
 159
 160 #ifdef YP
 161         if (pw != NULL && (pw->pw_fields & _PWF_SOURCE) == _PWF_NIS) {
 162                 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
 163                 master_mode = (ypclnt != NULL &&
 164                     ypclnt_connect(ypclnt) != -1 &&
 165                     ypclnt_havepasswdd(ypclnt) == 1);
 166                 ypclnt_free(ypclnt);
 167         } else
 168 #endif
 169         master_mode = (uid == 0);
 170
 171         if (op == NEWSH) {
 172                 /* protect p_shell -- it thinks NULL is /bin/sh */
 173                 if (!arg[0])
 174                         usage();
 175                 if (p_shell(arg, pw, (ENTRY *)NULL) == -1)
 176                         exit(1);
 177         }
 178
 179         if (op == NEWEXP) {
 180                 if (uid)        /* only root can change expire */
 181                         baduser();
 182                 if (p_expire(arg, pw, (ENTRY *)NULL) == -1)
 183                         exit(1);
 184         }
 185
 186         if (op == LOADENTRY) {
 187                 if (uid)
 188                         baduser();
 189                 pw = &lpw;
 190                 old_pw = NULL;
 191                 if (!__pw_scan(arg, pw, _PWSCAN_WARN|_PWSCAN_MASTER))
 192                         exit(1);
 193         }
 194
 195         if (op == NEWPW) {
 196                 if (uid)
 197                         baduser();
 198
 199                 if (strchr(arg, ':'))
 200                         errx(1, "invalid format for password");
 201                 pw->pw_passwd = arg;
 202         }
 203
 204         if (op == EDITENTRY) {
 205                 /*
 206                  * We don't really need pw_*() here, but pw_edit() (used
 207                  * by edit()) is just too useful...
 208                  */
 209                 if (pw_init(NULL, NULL))
 210                         err(1, "pw_init()");
 211                 if ((tfd = pw_tmp(-1)) == -1) {
 212                         pw_fini();
 213                         err(1, "pw_tmp()");
 214                 }
 215                 free(pw);
 216                 pw = edit(pw_tempname(), old_pw);
 217                 pw_fini();
 218                 if (pw == NULL)
 219                         err(1, "edit()");
 220                 /*
 221                  * pw_equal does not check for crypted passwords, so we
 222                  * should do it explicitly
 223                  */
 224                 if (pw_equal(old_pw, pw) &&
 225                     strcmp(old_pw->pw_passwd, pw->pw_passwd) == 0)
 226                         errx(0, "user information unchanged");
 227         }
 228
 229         if (old_pw && !master_mode) {
 230                 password = getpass("Password: ");
 231                 if (strcmp(crypt(password, old_pw->pw_passwd),
 232                     old_pw->pw_passwd) != 0)
 233                         baduser();
 234         } else {
 235                 password = "";
 236         }
 237
 238         if (old_pw != NULL)
 239                 pw->pw_fields |= (old_pw->pw_fields & _PWF_SOURCE);
 240         switch (pw->pw_fields & _PWF_SOURCE) {
 241 #ifdef YP
 242         case _PWF_NIS:
 243                 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
 244                 if (ypclnt == NULL ||
 245                     ypclnt_connect(ypclnt) == -1 ||
 246                     ypclnt_passwd(ypclnt, pw, password) == -1) {
 247                         warnx("%s", ypclnt->error);
 248                         ypclnt_free(ypclnt);
 249                         exit(1);
 250                 }
 251                 ypclnt_free(ypclnt);
 252                 errx(0, "NIS user information updated");
 253 #endif /* YP */
 254         case 0:
 255         case _PWF_FILES:
 256                 if (pw_init(NULL, NULL))
 257                         err(1, "pw_init()");
 258                 if ((pfd = pw_lock()) == -1) {
 259                         pw_fini();
 260                         err(1, "pw_lock()");
 261                 }
 262                 if ((tfd = pw_tmp(-1)) == -1) {
 263                         pw_fini();
 264                         err(1, "pw_tmp()");
 265                 }
 266                 if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
 267                         pw_fini();
 268                         err(1, "pw_copy");
 269                 }
 270                 if (pw_mkdb(pw->pw_name) == -1) {
 271                         pw_fini();
 272                         err(1, "pw_mkdb()");
 273                 }
 274                 pw_fini();
 275                 errx(0, "user information updated");
 276                 break;
 277         default:
 278                 errx(1, "unsupported passwd source");
 279         }
 280 }
 281
 282 static void
 283 baduser(void)
 284 {
 285
 286         errx(1, "%s", strerror(EACCES));
 287 }
 288
 289 static void
 290 usage(void)
 291 {
 292
 293         (void)fprintf(stderr,
 294             "usage: chpass%s %s [user]\n",
 295 #ifdef YP
 296             " [-d domain] [-h host]",
 297 #else
 298             "",
 299 #endif
 300             "[-a list] [-p encpass] [-s shell] [-e mmm dd yy]");
 301         exit(1);
 302 }