usr.bin/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  * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California.  All rights reserved.
  41  * @(#)chpass.c 8.4 (Berkeley) 4/2/94
  42  * $FreeBSD: src/usr.bin/chpass/chpass.c,v 1.28 2006/09/25 15:06:24 marck Exp $
  43  * $DragonFly: src/usr.bin/chpass/chpass.c,v 1.4 2003/11/03 19:31:28 eirikn Exp $
  44  */
  45
  46 #include <sys/param.h>
  47
  48 #include <err.h>
  49 #include <errno.h>
  50 #include <pwd.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <unistd.h>
  55 #ifdef YP
  56 #include <ypclnt.h>
  57 #endif
  58
  59 #include <pw_scan.h>
  60 #include <libutil.h>
  61
  62 #include "chpass.h"
  63
  64 int master_mode;
  65
  66 static void     baduser(void);
  67 static void     usage(void);
  68
  69 int
  70 main(int argc, char **argv)
  71 {
  72         enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW, NEWEXP } op;
  73         struct passwd lpw, *old_pw, *pw;
  74         int ch, pfd, tfd;
  75         const char *password;
  76         char *arg = NULL;
  77         uid_t uid;
  78 #ifdef YP
  79         struct ypclnt *ypclnt;
  80         const char *yp_domain = NULL, *yp_host = NULL;
  81 #endif
  82
  83         pw = old_pw = NULL;
  84         op = EDITENTRY;
  85 #ifdef YP
  86         while ((ch = getopt(argc, argv, "a:p:s:e:d:h:loy")) != -1)
  87 #else
  88         while ((ch = getopt(argc, argv, "a:p:s:e:")) != -1)
  89 #endif
  90                 switch (ch) {
  91                 case 'a':
  92                         op = LOADENTRY;
  93                         arg = optarg;
  94                         break;
  95                 case 's':
  96                         op = NEWSH;
  97                         arg = optarg;
  98                         break;
  99                 case 'p':
 100                         op = NEWPW;
 101                         arg = optarg;
 102                         break;
 103                 case 'e':
 104                         op = NEWEXP;
 105                         arg = optarg;
 106                         break;
 107 #ifdef YP
 108                 case 'd':
 109                         yp_domain = optarg;
 110                         break;
 111                 case 'h':
 112                         yp_host = optarg;
 113                         break;
 114                 case 'l':
 115                 case 'o':
 116                 case 'y':
 117                         /* compatibility */
 118                         break;
 119 #endif
 120                 case '?':
 121                 default:
 122                         usage();
 123                 }
 124
 125         argc -= optind;
 126         argv += optind;
 127
 128         if (argc > 1)
 129                 usage();
 130
 131         uid = getuid();
 132
 133         if (op == EDITENTRY || op == NEWSH || op == NEWPW || op == NEWEXP) {
 134                 if (argc == 0) {
 135                         if ((pw = getpwuid(uid)) == NULL)
 136                                 errx(1, "unknown user: uid %lu",
 137                                     (unsigned long)uid);
 138                 } else {
 139                         if ((pw = getpwnam(*argv)) == NULL)
 140                                 errx(1, "unknown user: %s", *argv);
 141                         if (uid != 0 && uid != pw->pw_uid)
 142                                 baduser();
 143                 }
 144
 145                 /* Make a copy for later verification */
 146                 if ((pw = pw_dup(pw)) == NULL ||
 147                     (old_pw = pw_dup(pw)) == NULL)
 148                         err(1, "pw_dup");
 149         }
 150
 151 #ifdef YP
 152         if (pw != NULL && (pw->pw_fields & _PWF_SOURCE) == _PWF_NIS) {
 153                 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
 154                 master_mode = (ypclnt != NULL &&
 155                     ypclnt_connect(ypclnt) != -1 &&
 156                     ypclnt_havepasswdd(ypclnt) == 1);
 157                 ypclnt_free(ypclnt);
 158         } else
 159 #endif
 160         master_mode = (uid == 0);
 161
 162         if (op == NEWSH) {
 163                 /* protect p_shell -- it thinks NULL is /bin/sh */
 164                 if (!arg[0])
 165                         usage();
 166                 if (p_shell(arg, pw, NULL) == -1)
 167                         exit(1);
 168         }
 169
 170         if (op == NEWEXP) {
 171                 if (uid)        /* only root can change expire */
 172                         baduser();
 173                 if (p_expire(arg, pw, NULL) == -1)
 174                         exit(1);
 175         }
 176
 177         if (op == LOADENTRY) {
 178                 if (uid)
 179                         baduser();
 180                 pw = &lpw;
 181                 old_pw = NULL;
 182                 if (!__pw_scan(arg, pw, _PWSCAN_WARN|_PWSCAN_MASTER))
 183                         exit(1);
 184         }
 185
 186         if (op == NEWPW) {
 187                 if (uid)
 188                         baduser();
 189
 190                 if (strchr(arg, ':'))
 191                         errx(1, "invalid format for password");
 192                 pw->pw_passwd = arg;
 193         }
 194
 195         if (op == EDITENTRY) {
 196                 /*
 197                  * We don't really need pw_*() here, but pw_edit() (used
 198                  * by edit()) is just too useful...
 199                  */
 200                 if (pw_init(NULL, NULL))
 201                         err(1, "pw_init()");
 202                 if ((tfd = pw_tmp(-1)) == -1) {
 203                         pw_fini();
 204                         err(1, "pw_tmp()");
 205                 }
 206                 free(pw);
 207                 pw = edit(pw_tempname(), old_pw);
 208                 pw_fini();
 209                 if (pw == NULL)
 210                         err(1, "edit()");
 211                 /*
 212                  * pw_equal does not check for crypted passwords, so we
 213                  * should do it explicitly
 214                  */
 215                 if (pw_equal(old_pw, pw) &&
 216                     strcmp(old_pw->pw_passwd, pw->pw_passwd) == 0)
 217                         errx(0, "user information unchanged");
 218         }
 219
 220         if (old_pw && !master_mode) {
 221                 password = getpass("Password: ");
 222                 if (strcmp(crypt(password, old_pw->pw_passwd),
 223                     old_pw->pw_passwd) != 0)
 224                         baduser();
 225         } else {
 226                 password = "";
 227         }
 228
 229         if (old_pw != NULL)
 230                 pw->pw_fields |= (old_pw->pw_fields & _PWF_SOURCE);
 231         switch (pw->pw_fields & _PWF_SOURCE) {
 232 #ifdef YP
 233         case _PWF_NIS:
 234                 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
 235                 if (ypclnt == NULL ||
 236                     ypclnt_connect(ypclnt) == -1 ||
 237                     ypclnt_passwd(ypclnt, pw, password) == -1) {
 238                         warnx("%s", ypclnt->error);
 239                         ypclnt_free(ypclnt);
 240                         exit(1);
 241                 }
 242                 ypclnt_free(ypclnt);
 243                 errx(0, "NIS user information updated");
 244 #endif /* YP */
 245         case 0:
 246         case _PWF_FILES:
 247                 if (pw_init(NULL, NULL))
 248                         err(1, "pw_init()");
 249                 if ((pfd = pw_lock()) == -1) {
 250                         pw_fini();
 251                         err(1, "pw_lock()");
 252                 }
 253                 if ((tfd = pw_tmp(-1)) == -1) {
 254                         pw_fini();
 255                         err(1, "pw_tmp()");
 256                 }
 257                 if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
 258                         pw_fini();
 259                         err(1, "pw_copy");
 260                 }
 261                 if (pw_mkdb(pw->pw_name) == -1) {
 262                         pw_fini();
 263                         err(1, "pw_mkdb()");
 264                 }
 265                 pw_fini();
 266                 errx(0, "user information updated");
 267                 break;
 268         default:
 269                 errx(1, "unsupported passwd source");
 270         }
 271 }
 272
 273 static void
 274 baduser(void)
 275 {
 276
 277         errx(1, "%s", strerror(EACCES));
 278 }
 279
 280 static void
 281 usage(void)
 282 {
 283
 284         fprintf(stderr,
 285             "usage: chpass%s %s [user]\n",
 286 #ifdef YP
 287             " [-d domain] [-h host]",
 288 #else
 289             "",
 290 #endif
 291             "[-a list] [-p encpass] [-s shell] [-e mmm dd yy]");
 292         exit(1);
 293 }