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