chpass.tproj/chpass.c

   1 /*
   2  * Copyright (c) 1999-2016 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*-
  24  * Copyright (c) 1988, 1993, 1994
  25  *      The Regents of the University of California.  All rights reserved.
  26  * Copyright (c) 2002 Networks Associates Technology, Inc.
  27  * All rights reserved.
  28  *
  29  * Portions of this software were developed for the FreeBSD Project by
  30  * ThinkSec AS and NAI Labs, the Security Research Division of Network
  31  * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
  32  * ("CBOSS"), as part of the DARPA CHATS research program.
  33  *
  34  * Redistribution and use in source and binary forms, with or without
  35  * modification, are permitted provided that the following conditions
  36  * are met:
  37  * 1. Redistributions of source code must retain the above copyright
  38  *    notice, this list of conditions and the following disclaimer.
  39  * 2. Redistributions in binary form must reproduce the above copyright
  40  *    notice, this list of conditions and the following disclaimer in the
  41  *    documentation and/or other materials provided with the distribution.
  42  * 3. All advertising materials mentioning features or use of this software
  43  *    must display the following acknowledgement:
  44  *      This product includes software developed by the University of
  45  *      California, Berkeley and its contributors.
  46  * 4. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  */
  62
  63 #if 0
  64 #if 0
  65 #ifndef lint
  66 static const char copyright[] =
  67 "@(#) Copyright (c) 1988, 1993, 1994\n\
  68         The Regents of the University of California.  All rights reserved.\n";
  69 #endif /* not lint */
  70
  71 #ifndef lint
  72 static char sccsid[] = "@(#)chpass.c    8.4 (Berkeley) 4/2/94";
  73 #endif /* not lint */
  74 #endif
  75 #include <sys/cdefs.h>
  76 __FBSDID("$FreeBSD: src/usr.bin/chpass/chpass.c,v 1.27.8.1 2006/09/29 06:13:20 marck Exp $");
  77 #endif
  78
  79 #include <sys/param.h>
  80 #include <sys/stat.h>
  81 #include <sys/signal.h>
  82 #include <sys/time.h>
  83 #include <sys/resource.h>
  84
  85 #include <err.h>
  86 #include <errno.h>
  87 #include <pwd.h>
  88 #include <stdio.h>
  89 #include <stdlib.h>
  90 #include <string.h>
  91 #include <unistd.h>
  92 #ifdef YP
  93 #include <ypclnt.h>
  94 #endif
  95
  96 #ifndef OPEN_DIRECTORY
  97 #include <pw_scan.h>
  98 #include <libutil.h>
  99 #endif
 100
 101 #include "chpass.h"
 102
 103 int master_mode;
 104
 105 #ifdef OPEN_DIRECTORY
 106 #include "open_directory.h"
 107 char *progname = NULL;
 108 CFStringRef DSPath = NULL;
 109 #endif /* OPEN_DIRECTORY */
 110
 111 static void     baduser(void);
 112 static void     usage(void);
 113
 114 int
 115 main(int argc, char *argv[])
 116 {
 117         enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW, NEWEXP } op;
 118 #ifndef OPEN_DIRECTORY
 119         struct passwd lpw, *old_pw, *pw;
 120         int ch, pfd, tfd;
 121         const char *password;
 122 #else
 123         struct passwd *old_pw, *pw;
 124         int ch, tfd;
 125         char tfn[MAXPATHLEN];
 126         char *tmpdir;
 127 #endif
 128         char *arg = NULL;
 129         uid_t uid;
 130 #ifdef YP
 131         struct ypclnt *ypclnt;
 132         const char *yp_domain = NULL, *yp_host = NULL;
 133 #endif
 134 #ifdef OPEN_DIRECTORY
 135         CFStringRef username = NULL;
 136         CFStringRef authname = NULL;
 137         CFStringRef location = NULL;
 138
 139         progname = strrchr(argv[0], '/');
 140         if (progname) progname++;
 141         else progname = argv[0];
 142 #endif /* OPEN_DIRECTORY */
 143
 144         pw = old_pw = NULL;
 145         op = EDITENTRY;
 146 #ifdef OPEN_DIRECTORY
 147         while ((ch = getopt(argc, argv, "a:s:l:u:")) != -1)
 148 #else /* OPEN_DIRECTORY */
 149 #ifdef YP
 150         while ((ch = getopt(argc, argv, "a:p:s:e:d:h:loy")) != -1)
 151 #else
 152         while ((ch = getopt(argc, argv, "a:p:s:e:")) != -1)
 153 #endif
 154 #endif /* OPEN_DIRECTORY */
 155                 switch (ch) {
 156                 case 'a':
 157                         op = LOADENTRY;
 158                         arg = optarg;
 159                         break;
 160                 case 's':
 161                         op = NEWSH;
 162                         arg = optarg;
 163                         break;
 164 #ifndef OPEN_DIRECTORY
 165                 case 'p':
 166                         op = NEWPW;
 167                         arg = optarg;
 168                         break;
 169                 case 'e':
 170                         op = NEWEXP;
 171                         arg = optarg;
 172                         break;
 173 #ifdef YP
 174                 case 'd':
 175                         yp_domain = optarg;
 176                         break;
 177                 case 'h':
 178                         yp_host = optarg;
 179                         break;
 180                 case 'l':
 181                 case 'o':
 182                 case 'y':
 183                         /* compatibility */
 184                         break;
 185 #endif
 186 #else /* OPEN_DIRECTORY */
 187                 case 'l':
 188                         location = CFStringCreateWithCString(NULL, optarg, kCFStringEncodingUTF8);
 189                         break;
 190                 case 'u':
 191                         authname = CFStringCreateWithCString(NULL, optarg, kCFStringEncodingUTF8);
 192                         break;
 193 #endif
 194                 case '?':
 195                 default:
 196                         usage();
 197                 }
 198
 199         argc -= optind;
 200         argv += optind;
 201
 202         if (argc > 1)
 203                 usage();
 204
 205         uid = getuid();
 206
 207         if (op == EDITENTRY || op == NEWSH || op == NEWPW || op == NEWEXP) {
 208                 if (argc == 0) {
 209                         if ((pw = getpwuid(uid)) == NULL)
 210                                 errx(1, "unknown user: uid %lu",
 211                                     (unsigned long)uid);
 212                 } else {
 213                         if ((pw = getpwnam(*argv)) == NULL)
 214                                 errx(1, "unknown user: %s", *argv);
 215 #ifndef OPEN_DIRECTORY
 216                         if (uid != 0 && uid != pw->pw_uid)
 217                                 baduser();
 218 #endif
 219                 }
 220
 221 #ifndef OPEN_DIRECTORY
 222                 /* Make a copy for later verification */
 223                 if ((pw = pw_dup(pw)) == NULL ||
 224                     (old_pw = pw_dup(pw)) == NULL)
 225                         err(1, "pw_dup");
 226 #endif
 227         }
 228
 229 #if OPEN_DIRECTORY
 230         master_mode = (uid == 0);
 231
 232         /*
 233          * Find the user record and copy its details.
 234          */
 235         username = CFStringCreateWithCString(NULL, pw->pw_name, kCFStringEncodingUTF8);
 236
 237         if (strcmp(progname, "chsh") == 0 || op == NEWSH) {
 238                 cfprintf(stderr, "Changing shell for %@.\n", username);
 239         } else if (strcmp(progname, "chfn") == 0) {
 240                 cfprintf(stderr, "Changing finger information for %@.\n", username);
 241         } else if (strcmp(progname, "chpass") == 0) {
 242                 cfprintf(stderr, "Changing account information for %@.\n", username);
 243         }
 244
 245         /*
 246          * odGetUser updates DSPath global variable, performs authentication
 247          * if necessary, and extracts the attributes.
 248          */
 249         CFDictionaryRef attrs_orig = NULL;
 250         CFDictionaryRef attrs = NULL;
 251         ODRecordRef rec = odGetUser(location, authname, username, &attrs_orig);
 252
 253         if (!rec || !attrs_orig) exit(1);
 254 #endif /* OPEN_DIRECTORY */
 255
 256 #ifdef YP
 257         if (pw != NULL && (pw->pw_fields & _PWF_SOURCE) == _PWF_NIS) {
 258                 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
 259                 master_mode = (ypclnt != NULL &&
 260                     ypclnt_connect(ypclnt) != -1 &&
 261                     ypclnt_havepasswdd(ypclnt) == 1);
 262                 ypclnt_free(ypclnt);
 263         } else
 264 #endif
 265         master_mode = (uid == 0);
 266
 267         if (op == NEWSH) {
 268                 /* protect p_shell -- it thinks NULL is /bin/sh */
 269                 if (!arg[0])
 270                         usage();
 271                 if (p_shell(arg, pw, (ENTRY *)NULL) == -1)
 272                         exit(1);
 273 #ifdef OPEN_DIRECTORY
 274                 else {
 275                         ENTRY* ep;
 276
 277                         setrestricted(attrs_orig);
 278
 279                         for (ep = list; ep->prompt; ep++) {
 280                                 if (strncasecmp(ep->prompt, "shell", ep->len) == 0) {
 281                                         if (!ep->restricted) {
 282                                                 CFStringRef shell = CFStringCreateWithCString(NULL, arg, kCFStringEncodingUTF8);
 283                                                 if (shell) {
 284                                                         attrs = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
 285                                                         if (attrs) CFDictionarySetValue((CFMutableDictionaryRef)attrs, kODAttributeTypeUserShell, shell);
 286                                                         CFRelease(shell);
 287                                                 }
 288                                         } else {
 289                                                 warnx("shell is restricted");
 290                                                 exit(1);
 291                                         }
 292                                 }
 293                         }
 294                 }
 295 #endif
 296         }
 297
 298 #ifndef OPEN_DIRECTORY
 299         if (op == NEWEXP) {
 300                 if (uid)        /* only root can change expire */
 301                         baduser();
 302                 if (p_expire(arg, pw, (ENTRY *)NULL) == -1)
 303                         exit(1);
 304         }
 305 #endif
 306
 307         if (op == LOADENTRY) {
 308                 if (uid)
 309                         baduser();
 310 #ifdef OPEN_DIRECTORY
 311                 warnx("-a is not supported for Open Directory.");
 312                 exit(1);
 313 #else
 314                 pw = &lpw;
 315                 old_pw = NULL;
 316                 if (!__pw_scan(arg, pw, _PWSCAN_WARN|_PWSCAN_MASTER))
 317                         exit(1);
 318 #endif /* OPEN_DIRECTORY */
 319         }
 320
 321 #ifndef OPEN_DIRECTORY
 322         if (op == NEWPW) {
 323                 if (uid)
 324                         baduser();
 325
 326                 if (strchr(arg, ':'))
 327                         errx(1, "invalid format for password");
 328                 pw->pw_passwd = arg;
 329         }
 330 #endif /* OPEN_DIRECTORY */
 331
 332         if (op == EDITENTRY) {
 333 #ifdef OPEN_DIRECTORY
 334                 setrestricted(attrs_orig);
 335                 tmpdir = getenv("TMPDIR");
 336                 if (!tmpdir)
 337                         tmpdir = P_tmpdir; // defined in the system headers, defaults to /tmp
 338                 snprintf(tfn, sizeof(tfn), "%s/%s.XXXXXX", tmpdir, progname);
 339                 if ((tfd = mkstemp(tfn)) == -1)
 340                         err(1, "%s", tfn);
 341                 attrs = (CFMutableDictionaryRef)edit(tfn, attrs_orig);
 342                 (void)unlink(tfn);
 343 #else
 344                 /*
 345                  * We don't really need pw_*() here, but pw_edit() (used
 346                  * by edit()) is just too useful...
 347                  */
 348                 if (pw_init(NULL, NULL))
 349                         err(1, "pw_init()");
 350                 if ((tfd = pw_tmp(-1)) == -1) {
 351                         pw_fini();
 352                         err(1, "pw_tmp()");
 353                 }
 354                 free(pw);
 355                 pw = edit(pw_tempname(), old_pw);
 356                 pw_fini();
 357                 if (pw == NULL)
 358                         err(1, "edit()");
 359                 /*
 360                  * pw_equal does not check for crypted passwords, so we
 361                  * should do it explicitly
 362                  */
 363                 if (pw_equal(old_pw, pw) &&
 364                     strcmp(old_pw->pw_passwd, pw->pw_passwd) == 0)
 365                         errx(0, "user information unchanged");
 366 #endif /* OPEN_DIRECTORY */
 367         }
 368
 369 #ifndef OPEN_DIRECTORY
 370         if (old_pw && !master_mode) {
 371                 password = getpass("Password: ");
 372                 if (strcmp(crypt(password, old_pw->pw_passwd),
 373                     old_pw->pw_passwd) != 0)
 374                         baduser();
 375         } else {
 376                 password = "";
 377         }
 378 #endif
 379
 380 #ifdef OPEN_DIRECTORY
 381         odUpdateUser(rec, attrs_orig, attrs);
 382
 383         if (rec) CFRelease(rec);
 384
 385         exit(0);
 386         return 0;
 387 #else /* OPEN_DIRECTORY */
 388         exit(0);
 389         if (old_pw != NULL)
 390                 pw->pw_fields |= (old_pw->pw_fields & _PWF_SOURCE);
 391         switch (pw->pw_fields & _PWF_SOURCE) {
 392 #ifdef YP
 393         case _PWF_NIS:
 394                 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
 395                 if (ypclnt == NULL ||
 396                     ypclnt_connect(ypclnt) == -1 ||
 397                     ypclnt_passwd(ypclnt, pw, password) == -1) {
 398                         warnx("%s", ypclnt->error);
 399                         ypclnt_free(ypclnt);
 400                         exit(1);
 401                 }
 402                 ypclnt_free(ypclnt);
 403                 errx(0, "NIS user information updated");
 404 #endif /* YP */
 405         case 0:
 406         case _PWF_FILES:
 407                 if (pw_init(NULL, NULL))
 408                         err(1, "pw_init()");
 409                 if ((pfd = pw_lock()) == -1) {
 410                         pw_fini();
 411                         err(1, "pw_lock()");
 412                 }
 413                 if ((tfd = pw_tmp(-1)) == -1) {
 414                         pw_fini();
 415                         err(1, "pw_tmp()");
 416                 }
 417                 if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
 418                         pw_fini();
 419                         err(1, "pw_copy");
 420                 }
 421                 if (pw_mkdb(pw->pw_name) == -1) {
 422                         pw_fini();
 423                         err(1, "pw_mkdb()");
 424                 }
 425                 pw_fini();
 426                 errx(0, "user information updated");
 427                 break;
 428         default:
 429                 errx(1, "unsupported passwd source");
 430         }
 431 #endif /* OPEN_DIRECTORY */
 432 }
 433
 434 static void
 435 baduser(void)
 436 {
 437         errx(1, "%s", strerror(EACCES));
 438 }
 439
 440 static void
 441 usage(void)
 442 {
 443         (void)fprintf(stderr,
 444             "usage: chpass%s %s [user]\n",
 445 #ifdef OPEN_DIRECTORY
 446                 "",
 447                 "[-l location] [-u authname] [-s shell]");
 448 #else /* OPEN_DIRECTORY */
 449 #ifdef YP
 450             " [-d domain] [-h host]",
 451 #else
 452             "",
 453 #endif
 454             "[-a list] [-p encpass] [-s shell] [-e mmm dd yy]");
 455 #endif /* OPEN_DIRECTORY */
 456         exit(1);
 457 }