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. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California.  All rights reserved.
  37  * @(#)chpass.c 8.4 (Berkeley) 4/2/94
  38  * $FreeBSD: src/usr.bin/chpass/chpass.c,v 1.28 2006/09/25 15:06:24 marck Exp $
  39  * $DragonFly: src/usr.bin/chpass/chpass.c,v 1.4 2003/11/03 19:31:28 eirikn Exp $
  40  */
  41
  42 #include <sys/param.h>
  43
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <pwd.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51 #ifdef YP
  52 #include <ypclnt.h>
  53 #endif
  54
  55 #include <pw_scan.h>
  56 #include <libutil.h>
  57
  58 #include "chpass.h"
  59
  60 int master_mode;
  61
  62 static void     baduser(void);
  63 static void     usage(void);
  64
  65 int
  66 main(int argc, char **argv)
  67 {
  68         enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW, NEWEXP } op;
  69         struct passwd lpw, *old_pw, *pw;
  70         int ch, pfd, tfd;
  71         const char *password;
  72         char *cryptpw;
  73         char *arg = NULL;
  74         uid_t uid;
  75 #ifdef YP
  76         struct ypclnt *ypclnt;
  77         const char *yp_domain = NULL, *yp_host = NULL;
  78 #endif
  79
  80         pw = old_pw = NULL;
  81         op = EDITENTRY;
  82 #ifdef YP
  83         while ((ch = getopt(argc, argv, "a:p:s:e:d:h:loy")) != -1)
  84 #else
  85         while ((ch = getopt(argc, argv, "a:p:s:e:")) != -1)
  86 #endif
  87                 switch (ch) {
  88                 case 'a':
  89                         op = LOADENTRY;
  90                         arg = optarg;
  91                         break;
  92                 case 's':
  93                         op = NEWSH;
  94                         arg = optarg;
  95                         break;
  96                 case 'p':
  97                         op = NEWPW;
  98                         arg = optarg;
  99                         break;
 100                 case 'e':
 101                         op = NEWEXP;
 102                         arg = optarg;
 103                         break;
 104 #ifdef YP
 105                 case 'd':
 106                         yp_domain = optarg;
 107                         break;
 108                 case 'h':
 109                         yp_host = optarg;
 110                         break;
 111                 case 'l':
 112                 case 'o':
 113                 case 'y':
 114                         /* compatibility */
 115                         break;
 116 #endif
 117                 case '?':
 118                 default:
 119                         usage();
 120                 }
 121
 122         argc -= optind;
 123         argv += optind;
 124
 125         if (argc > 1)
 126                 usage();
 127
 128         uid = getuid();
 129
 130         if (op == EDITENTRY || op == NEWSH || op == NEWPW || op == NEWEXP) {
 131                 if (argc == 0) {
 132                         if ((pw = getpwuid(uid)) == NULL)
 133                                 errx(1, "unknown user: uid %lu",
 134                                     (unsigned long)uid);
 135                 } else {
 136                         if ((pw = getpwnam(*argv)) == NULL)
 137                                 errx(1, "unknown user: %s", *argv);
 138                         if (uid != 0 && uid != pw->pw_uid)
 139                                 baduser();
 140                 }
 141
 142                 /* Make a copy for later verification */
 143                 if ((pw = pw_dup(pw)) == NULL ||
 144                     (old_pw = pw_dup(pw)) == NULL)
 145                         err(1, "pw_dup");
 146         }
 147
 148 #ifdef YP
 149         if (pw != NULL && (pw->pw_fields & _PWF_SOURCE) == _PWF_NIS) {
 150                 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
 151                 master_mode = (ypclnt != NULL &&
 152                     ypclnt_connect(ypclnt) != -1 &&
 153                     ypclnt_havepasswdd(ypclnt) == 1);
 154                 ypclnt_free(ypclnt);
 155         } else
 156 #endif
 157         master_mode = (uid == 0);
 158
 159         if (op == NEWSH) {
 160                 /* protect p_shell -- it thinks NULL is /bin/sh */
 161                 if (!arg[0])
 162                         usage();
 163                 if (p_shell(arg, pw, NULL) == -1)
 164                         exit(1);
 165         }
 166
 167         if (op == NEWEXP) {
 168                 if (uid)        /* only root can change expire */
 169                         baduser();
 170                 if (p_expire(arg, pw, NULL) == -1)
 171                         exit(1);
 172         }
 173
 174         if (op == LOADENTRY) {
 175                 if (uid)
 176                         baduser();
 177                 pw = &lpw;
 178                 old_pw = NULL;
 179                 if (!__pw_scan(arg, pw, _PWSCAN_WARN|_PWSCAN_MASTER))
 180                         exit(1);
 181         }
 182
 183         if (op == NEWPW) {
 184                 if (uid)
 185                         baduser();
 186
 187                 if (strchr(arg, ':'))
 188                         errx(1, "invalid format for password");
 189                 pw->pw_passwd = arg;
 190         }
 191
 192         if (op == EDITENTRY) {
 193                 /*
 194                  * We don't really need pw_*() here, but pw_edit() (used
 195                  * by edit()) is just too useful...
 196                  */
 197                 if (pw_init(NULL, NULL))
 198                         err(1, "pw_init()");
 199                 if ((tfd = pw_tmp(-1)) == -1) {
 200                         pw_fini();
 201                         err(1, "pw_tmp()");
 202                 }
 203                 free(pw);
 204                 pw = edit(pw_tempname(), old_pw);
 205                 pw_fini();
 206                 if (pw == NULL)
 207                         err(1, "edit()");
 208                 /*
 209                  * pw_equal does not check for crypted passwords, so we
 210                  * should do it explicitly
 211                  */
 212                 if (pw_equal(old_pw, pw) &&
 213                     strcmp(old_pw->pw_passwd, pw->pw_passwd) == 0)
 214                         errx(0, "user information unchanged");
 215         }
 216
 217         if (old_pw && !master_mode) {
 218                 password = getpass("Password: ");
 219                 cryptpw = crypt(password, old_pw->pw_passwd);
 220                 if (cryptpw == NULL || strcmp(cryptpw, old_pw->pw_passwd) != 0)
 221                         baduser();
 222         } else {
 223                 password = "";
 224         }
 225
 226         if (old_pw != NULL)
 227                 pw->pw_fields |= (old_pw->pw_fields & _PWF_SOURCE);
 228         switch (pw->pw_fields & _PWF_SOURCE) {
 229 #ifdef YP
 230         case _PWF_NIS:
 231                 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
 232                 if (ypclnt == NULL ||
 233                     ypclnt_connect(ypclnt) == -1 ||
 234                     ypclnt_passwd(ypclnt, pw, password) == -1) {
 235                         warnx("%s", ypclnt->error);
 236                         ypclnt_free(ypclnt);
 237                         exit(1);
 238                 }
 239                 ypclnt_free(ypclnt);
 240                 errx(0, "NIS user information updated");
 241 #endif /* YP */
 242         case 0:
 243         case _PWF_FILES:
 244                 if (pw_init(NULL, NULL))
 245                         err(1, "pw_init()");
 246                 if ((pfd = pw_lock()) == -1) {
 247                         pw_fini();
 248                         err(1, "pw_lock()");
 249                 }
 250                 if ((tfd = pw_tmp(-1)) == -1) {
 251                         pw_fini();
 252                         err(1, "pw_tmp()");
 253                 }
 254                 if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
 255                         pw_fini();
 256                         err(1, "pw_copy");
 257                 }
 258                 if (pw_mkdb(pw->pw_name) == -1) {
 259                         pw_fini();
 260                         err(1, "pw_mkdb()");
 261                 }
 262                 pw_fini();
 263                 errx(0, "user information updated");
 264                 break;
 265         default:
 266                 errx(1, "unsupported passwd source");
 267         }
 268 }
 269
 270 static void
 271 baduser(void)
 272 {
 273
 274         errx(1, "%s", strerror(EACCES));
 275 }
 276
 277 static void
 278 usage(void)
 279 {
 280
 281         fprintf(stderr,
 282             "usage: chpass%s %s [user]\n",
 283 #ifdef YP
 284             " [-d domain] [-h host]",
 285 #else
 286             "",
 287 #endif
 288             "[-a list] [-p encpass] [-s shell] [-e mmm dd yy]");
 289         exit(1);
 290 }