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 #ifndef lint
  42 static const char copyright[] =
  43 "@(#) Copyright (c) 1988, 1993, 1994\n\
  44         The Regents of the University of California.  All rights reserved.\n";
  45 #endif /* not lint */
  46
  47 #if 0
  48 #ifndef lint
  49 static char sccsid[] = "@(#)chpass.c    8.4 (Berkeley) 4/2/94";
  50 #endif /* not lint */
  51 #endif
  52
  53 #include <sys/cdefs.h>
  54 __FBSDID("$FreeBSD$");
  55
  56 #include <sys/param.h>
  57 #include <sys/stat.h>
  58 #include <sys/signal.h>
  59 #include <sys/time.h>
  60 #include <sys/resource.h>
  61
  62 #include <ctype.h>
  63 #include <err.h>
  64 #include <errno.h>
  65 #include <fcntl.h>
  66 #include <pwd.h>
  67 #include <stdio.h>
  68 #include <stdlib.h>
  69 #include <string.h>
  70 #include <unistd.h>
  71 #ifdef YP
  72 #include <ypclnt.h>
  73 #endif
  74
  75 #include <pw_scan.h>
  76 #include <libutil.h>
  77
  78 #include "chpass.h"
  79
  80 int master_mode;
  81
  82 static void     baduser(void);
  83 static void     usage(void);
  84
  85 int
  86 main(int argc, char *argv[])
  87 {
  88         enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW, NEWEXP } op;
  89         struct passwd lpw, *old_pw, *pw;
  90         int ch, pfd, tfd;
  91         const char *password;
  92         char *arg = NULL;
  93         uid_t uid;
  94 #ifdef YP
  95         struct ypclnt *ypclnt;
  96         const char *yp_domain = NULL, *yp_host = NULL;
  97 #endif
  98
  99         pw = old_pw = NULL;
 100         op = EDITENTRY;
 101 #ifdef YP
 102         while ((ch = getopt(argc, argv, "a:p:s:e:d:h:loy")) != -1)
 103 #else
 104         while ((ch = getopt(argc, argv, "a:p:s:e:")) != -1)
 105 #endif
 106                 switch (ch) {
 107                 case 'a':
 108                         op = LOADENTRY;
 109                         arg = optarg;
 110                         break;
 111                 case 's':
 112                         op = NEWSH;
 113                         arg = optarg;
 114                         break;
 115                 case 'p':
 116                         op = NEWPW;
 117                         arg = optarg;
 118                         break;
 119                 case 'e':
 120                         op = NEWEXP;
 121                         arg = optarg;
 122                         break;
 123 #ifdef YP
 124                 case 'd':
 125                         yp_domain = optarg;
 126                         break;
 127                 case 'h':
 128                         yp_host = optarg;
 129                         break;
 130                 case 'l':
 131                 case 'o':
 132                 case 'y':
 133                         /* compatibility */
 134                         break;
 135 #endif
 136                 case '?':
 137                 default:
 138                         usage();
 139                 }
 140
 141         argc -= optind;
 142         argv += optind;
 143
 144         if (argc > 1)
 145                 usage();
 146
 147         uid = getuid();
 148
 149         if (op == EDITENTRY || op == NEWSH || op == NEWPW || op == NEWEXP) {
 150                 if (argc == 0) {
 151                         if ((pw = getpwuid(uid)) == NULL)
 152                                 errx(1, "unknown user: uid %lu",
 153                                     (unsigned long)uid);
 154                 } else {
 155                         if ((pw = getpwnam(*argv)) == NULL)
 156                                 errx(1, "unknown user: %s", *argv);
 157                         if (uid != 0 && uid != pw->pw_uid)
 158                                 baduser();
 159                 }
 160
 161                 /* Make a copy for later verification */
 162                 if ((pw = pw_dup(pw)) == NULL ||
 163                     (old_pw = pw_dup(pw)) == NULL)
 164                         err(1, "pw_dup");
 165         }
 166
 167 #ifdef YP
 168         if (pw != NULL && (pw->pw_fields & _PWF_SOURCE) == _PWF_NIS) {
 169                 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
 170                 master_mode = (ypclnt != NULL &&
 171                     ypclnt_connect(ypclnt) != -1 &&
 172                     ypclnt_havepasswdd(ypclnt) == 1);
 173                 ypclnt_free(ypclnt);
 174         } else
 175 #endif
 176         master_mode = (uid == 0);
 177
 178         if (op == NEWSH) {
 179                 /* protect p_shell -- it thinks NULL is /bin/sh */
 180                 if (!arg[0])
 181                         usage();
 182                 if (p_shell(arg, pw, (ENTRY *)NULL) == -1)
 183                         exit(1);
 184         }
 185
 186         if (op == NEWEXP) {
 187                 if (uid)        /* only root can change expire */
 188                         baduser();
 189                 if (p_expire(arg, pw, (ENTRY *)NULL) == -1)
 190                         exit(1);
 191         }
 192
 193         if (op == LOADENTRY) {
 194                 if (uid)
 195                         baduser();
 196                 pw = &lpw;
 197                 old_pw = NULL;
 198                 if (!__pw_scan(arg, pw, _PWSCAN_WARN|_PWSCAN_MASTER))
 199                         exit(1);
 200         }
 201
 202         if (op == NEWPW) {
 203                 if (uid)
 204                         baduser();
 205
 206                 if (strchr(arg, ':'))
 207                         errx(1, "invalid format for password");
 208                 pw->pw_passwd = arg;
 209         }
 210
 211         if (op == EDITENTRY) {
 212                 /*
 213                  * We don't really need pw_*() here, but pw_edit() (used
 214                  * by edit()) is just too useful...
 215                  */
 216                 if (pw_init(NULL, NULL))
 217                         err(1, "pw_init()");
 218                 if ((tfd = pw_tmp(-1)) == -1) {
 219                         pw_fini();
 220                         err(1, "pw_tmp()");
 221                 }
 222                 free(pw);
 223                 pw = edit(pw_tempname(), old_pw);
 224                 pw_fini();
 225                 if (pw == NULL)
 226                         err(1, "edit()");
 227                 if (pw_equal(old_pw, pw))
 228                         errx(0, "user information unchanged");
 229         }
 230
 231         if (old_pw && !master_mode) {
 232                 password = getpass("Password: ");
 233                 if (strcmp(crypt(password, old_pw->pw_passwd),
 234                     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                     ypclnt_connect(ypclnt) == -1 ||
 248                     ypclnt_passwd(ypclnt, pw, password) == -1) {
 249                         warnx("%s", ypclnt->error);
 250                         ypclnt_free(ypclnt);
 251                         exit(1);
 252                 }
 253                 ypclnt_free(ypclnt);
 254                 errx(0, "NIS user information updated");
 255 #endif /* YP */
 256         case 0:
 257         case _PWF_FILES:
 258                 if (pw_init(NULL, NULL))
 259                         err(1, "pw_init()");
 260                 if ((pfd = pw_lock()) == -1) {
 261                         pw_fini();
 262                         err(1, "pw_lock()");
 263                 }
 264                 if ((tfd = pw_tmp(-1)) == -1) {
 265                         pw_fini();
 266                         err(1, "pw_tmp()");
 267                 }
 268                 if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
 269                         pw_fini();
 270                         err(1, "pw_copy");
 271                 }
 272                 if (pw_mkdb(pw->pw_name) == -1) {
 273                         pw_fini();
 274                         err(1, "pw_mkdb()");
 275                 }
 276                 pw_fini();
 277                 errx(0, "user information updated");
 278                 break;
 279         default:
 280                 errx(1, "unsupported passwd source");
 281         }
 282 }
 283
 284 static void
 285 baduser(void)
 286 {
 287
 288         errx(1, "%s", strerror(EACCES));
 289 }
 290
 291 static void
 292 usage(void)
 293 {
 294
 295         (void)fprintf(stderr,
 296             "Usage: chpass%s %s [user]\n",
 297 #ifdef YP
 298             " [-d domain] [-h host]",
 299 #else
 300             "",
 301 #endif
 302             "[-a list] [-p encpass] [-s shell] [-e mmm dd yy]");
 303         exit(1);
 304 }