granicus.if.org Git - shadow/blob - src/pwck.c

   1 /*
   2  * Copyright (c) 1992 - 1994, Julianne Frances Haugh
   3  * Copyright (c) 1996 - 2000, Marek Michałkiewicz
   4  * Copyright (c) 2001       , Michał Moskal
   5  * Copyright (c) 2001 - 2006, Tomasz Kłoczko
   6  * Copyright (c) 2007 - 2010, Nicolas François
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. The name of the copyright holders or contributors may not be used to
  18  *    endorse or promote products derived from this software without
  19  *    specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  24  * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT
  25  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <config.h>
  35
  36 #ident "$Id$"
  37
  38 #include <fcntl.h>
  39 #include <grp.h>
  40 #include <pwd.h>
  41 #include <stdio.h>
  42 #include "chkname.h"
  43 #include "commonio.h"
  44 #include "defines.h"
  45 #include "prototypes.h"
  46 #include "pwio.h"
  47 #include "shadowio.h"
  48 #include "getdef.h"
  49 #include "nscd.h"
  50 #ifdef WITH_TCB
  51 #include "tcbfuncs.h"
  52 #endif                          /* WITH_TCB */
  53
  54 /*
  55  * Exit codes
  56  */
  57 /*@-exitarg@*/
  58 #define E_OKAY          0
  59 #define E_USAGE         1
  60 #define E_BADENTRY      2
  61 #define E_CANTOPEN      3
  62 #define E_CANTLOCK      4
  63 #define E_CANTUPDATE    5
  64 #define E_CANTSORT      6
  65
  66 /*
  67  * Global variables
  68  */
  69 const char *Prog;
  70
  71 static bool use_system_pw_file = true;
  72 static bool use_system_spw_file = true;
  73
  74 static bool is_shadow = false;
  75
  76 static bool pw_opened  = false;
  77 static bool spw_opened = false;
  78
  79 static bool pw_locked  = false;
  80 static bool spw_locked = false;
  81
  82 /* Options */
  83 static bool read_only = false;
  84 static bool sort_mode = false;
  85 static bool quiet = false;              /* don't report warnings, only errors */
  86
  87 /* local function prototypes */
  88 static void fail_exit (int code);
  89 static void usage (void);
  90 static void process_flags (int argc, char **argv);
  91 static void open_files (void);
  92 static void close_files (bool changed);
  93 static void check_pw_file (int *errors, bool *changed);
  94 static void check_spw_file (int *errors, bool *changed);
  95
  96 /*
  97  * fail_exit - do some cleanup and exit with the given error code
  98  */
  99 static void fail_exit (int code)
 100 {
 101         if (spw_locked) {
 102                 if (spw_unlock () == 0) {
 103                         fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, spw_dbname ());
 104                         if (use_system_spw_file) {
 105                                 SYSLOG ((LOG_ERR, "failed to unlock %s",
 106                                          spw_dbname ()));
 107                         }
 108                         /* continue */
 109                 }
 110         }
 111
 112         if (pw_locked) {
 113                 if (pw_unlock () == 0) {
 114                         fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, pw_dbname ());
 115                         if (use_system_pw_file) {
 116                                 SYSLOG ((LOG_ERR, "failed to unlock %s",
 117                                          pw_dbname ()));
 118                         }
 119                         /* continue */
 120                 }
 121         }
 122
 123         closelog ();
 124
 125         exit (code);
 126 }
 127 /*
 128  * usage - print syntax message and exit
 129  */
 130 static void usage (void)
 131 {
 132 #ifdef WITH_TCB
 133         if (getdef_bool ("USE_TCB")) {
 134                 fprintf (stderr, _("Usage: %s [-q] [-r] [passwd]\n"),
 135                          Prog);
 136         } else
 137 #endif                          /* WITH_TCB */
 138         {
 139                 fprintf (stderr,
 140                          _("Usage: %s [-q] [-r] [-s] [passwd [shadow]]\n"),
 141                          Prog);
 142         }
 143         exit (E_USAGE);
 144 }
 145
 146 /*
 147  * process_flags - parse the command line options
 148  *
 149  *      It will not return if an error is encountered.
 150  */
 151 static void process_flags (int argc, char **argv)
 152 {
 153         int arg;
 154
 155         /*
 156          * Parse the command line arguments
 157          */
 158         while ((arg = getopt (argc, argv, "eqrs")) != EOF) {
 159                 switch (arg) {
 160                 case 'e':       /* added for Debian shadow-961025-2 compatibility */
 161                 case 'q':
 162                         quiet = true;
 163                         break;
 164                 case 'r':
 165                         read_only = true;
 166                         break;
 167                 case 's':
 168                         sort_mode = true;
 169                         break;
 170                 default:
 171                         usage ();
 172                 }
 173         }
 174
 175         if (sort_mode && read_only) {
 176                 fprintf (stderr, _("%s: -s and -r are incompatible\n"), Prog);
 177                 exit (E_USAGE);
 178         }
 179
 180         /*
 181          * Make certain we have the right number of arguments
 182          */
 183         if ((argc < optind) || (argc > (optind + 2))) {
 184                 usage ();
 185         }
 186
 187         /*
 188          * If there are two left over filenames, use those as the password
 189          * and shadow password filenames.
 190          */
 191         if (optind != argc) {
 192                 pw_setdbname (argv[optind]);
 193                 use_system_pw_file = false;
 194         }
 195         if ((optind + 2) == argc) {
 196 #ifdef WITH_TCB
 197                 if (getdef_bool ("USE_TCB")) {
 198                         fprintf (stderr,
 199                                  _("%s: no alternative shadow file allowed when USE_TCB is enabled.\n"),
 200                                  Prog);
 201                         usage ();
 202                 }
 203 #endif                          /* WITH_TCB */
 204                 spw_setdbname (argv[optind + 1]);
 205                 is_shadow = true;
 206                 use_system_spw_file = false;
 207         } else if (optind == argc) {
 208                 is_shadow = spw_file_present ();
 209         }
 210 }
 211
 212 /*
 213  * open_files - open the shadow database
 214  *
 215  *      In read-only mode, the databases are not locked and are opened
 216  *      only for reading.
 217  */
 218 static void open_files (void)
 219 {
 220         bool use_tcb = false;
 221 #ifdef WITH_TCB
 222         use_tcb = getdef_bool ("USE_TCB");
 223 #endif                          /* WITH_TCB */
 224
 225         /*
 226          * Lock the files if we aren't in "read-only" mode
 227          */
 228         if (!read_only) {
 229                 if (pw_lock () == 0) {
 230                         fprintf (stderr,
 231                                  _("%s: cannot lock %s; try again later.\n"),
 232                                  Prog, pw_dbname ());
 233                         fail_exit (E_CANTLOCK);
 234                 }
 235                 pw_locked = true;
 236                 if (is_shadow && !use_tcb) {
 237                         if (spw_lock () == 0) {
 238                                 fprintf (stderr,
 239                                          _("%s: cannot lock %s; try again later.\n"),
 240                                          Prog, spw_dbname ());
 241                                 fail_exit (E_CANTLOCK);
 242                         }
 243                         spw_locked = true;
 244                 }
 245         }
 246
 247         /*
 248          * Open the files. Use O_RDONLY if we are in read_only mode, O_RDWR
 249          * otherwise.
 250          */
 251         if (pw_open (read_only ? O_RDONLY : O_RDWR) == 0) {
 252                 fprintf (stderr, _("%s: cannot open %s\n"),
 253                          Prog, pw_dbname ());
 254                 if (use_system_pw_file) {
 255                         SYSLOG ((LOG_WARN, "cannot open %s", pw_dbname ()));
 256                 }
 257                 fail_exit (E_CANTOPEN);
 258         }
 259         pw_opened = true;
 260         if (is_shadow && !use_tcb) {
 261                 if (spw_open (read_only ? O_RDONLY : O_RDWR) == 0) {
 262                         fprintf (stderr, _("%s: cannot open %s\n"),
 263                                  Prog, spw_dbname ());
 264                         if (use_system_spw_file) {
 265                                 SYSLOG ((LOG_WARN, "cannot open %s",
 266                                          spw_dbname ()));
 267                         }
 268                         fail_exit (E_CANTOPEN);
 269                 }
 270                 spw_opened = true;
 271         }
 272 }
 273
 274 /*
 275  * close_files - close and unlock the password/shadow databases
 276  *
 277  *      If changed is not set, the databases are not closed, and no
 278  *      changes are committed in the databases. The databases are
 279  *      unlocked anyway.
 280  */
 281 static void close_files (bool changed)
 282 {
 283         /*
 284          * All done. If there were no change we can just abandon any
 285          * changes to the files.
 286          */
 287         if (changed) {
 288                 if (pw_opened && pw_close () == 0) {
 289                         fprintf (stderr,
 290                                  _("%s: failure while writing changes to %s\n"),
 291                                  Prog, pw_dbname ());
 292                         if (use_system_pw_file) {
 293                                 SYSLOG ((LOG_ERR,
 294                                          "failure while writing changes to %s",
 295                                          pw_dbname ()));
 296                         }
 297                         fail_exit (E_CANTUPDATE);
 298                 }
 299                 pw_opened = false;
 300                 if (is_shadow && spw_opened && (spw_close () == 0)) {
 301                         fprintf (stderr,
 302                                  _("%s: failure while writing changes to %s\n"),
 303                                  Prog, spw_dbname ());
 304                         if (use_system_spw_file) {
 305                                 SYSLOG ((LOG_ERR,
 306                                          "failure while writing changes to %s",
 307                                          spw_dbname ()));
 308                         }
 309                         fail_exit (E_CANTUPDATE);
 310                 }
 311                 spw_opened = false;
 312         }
 313
 314         /*
 315          * Don't be anti-social - unlock the files when you're done.
 316          */
 317         if (spw_locked) {
 318                 if (spw_unlock () == 0) {
 319                         fprintf (stderr,
 320                                  _("%s: failed to unlock %s\n"),
 321                                  Prog, spw_dbname ());
 322                         if (use_system_spw_file) {
 323                                 SYSLOG ((LOG_ERR, "failed to unlock %s",
 324                                          spw_dbname ()));
 325                         }
 326                         /* continue */
 327                 }
 328         }
 329         spw_locked = false;
 330         if (pw_locked) {
 331                 if (pw_unlock () == 0) {
 332                         fprintf (stderr,
 333                                  _("%s: failed to unlock %s\n"),
 334                                  Prog, pw_dbname ());
 335                         if (use_system_pw_file) {
 336                                 SYSLOG ((LOG_ERR, "failed to unlock %s",
 337                                          pw_dbname ()));
 338                         }
 339                         /* continue */
 340                 }
 341         }
 342         pw_locked = false;
 343 }
 344
 345 /*
 346  * check_pw_file - check the content of the passwd file
 347  */
 348 static void check_pw_file (int *errors, bool *changed)
 349 {
 350         struct commonio_entry *pfe, *tpfe;
 351         struct passwd *pwd;
 352         struct spwd *spw;
 353
 354         /*
 355          * Loop through the entire password file.
 356          */
 357         for (pfe = __pw_get_head (); NULL != pfe; pfe = pfe->next) {
 358                 /*
 359                  * If this is a NIS line, skip it. You can't "know" what NIS
 360                  * is going to do without directly asking NIS ...
 361                  */
 362                 if (('+' == pfe->line[0]) || ('-' == pfe->line[0])) {
 363                         continue;
 364                 }
 365
 366                 /*
 367                  * Start with the entries that are completely corrupt.  They
 368                  * have no (struct passwd) entry because they couldn't be
 369                  * parsed properly.
 370                  */
 371                 if (NULL == pfe->eptr) {
 372                         /*
 373                          * Tell the user this entire line is bogus and ask
 374                          * them to delete it.
 375                          */
 376                         puts (_("invalid password file entry"));
 377                         printf (_("delete line '%s'? "), pfe->line);
 378                         *errors += 1;
 379
 380                         /*
 381                          * prompt the user to delete the entry or not
 382                          */
 383                         if (!yes_or_no (read_only)) {
 384                                 continue;
 385                         }
 386
 387                         /*
 388                          * All password file deletions wind up here. This
 389                          * code removes the current entry from the linked
 390                          * list. When done, it skips back to the top of the
 391                          * loop to try out the next list element.
 392                          */
 393                       delete_pw:
 394                         if (use_system_pw_file) {
 395                                 SYSLOG ((LOG_INFO, "delete passwd line '%s'",
 396                                          pfe->line));
 397                         }
 398                         *changed = true;
 399
 400                         __pw_del_entry (pfe);
 401                         continue;
 402                 }
 403
 404                 /*
 405                  * Password structure is good, start using it.
 406                  */
 407                 pwd = pfe->eptr;
 408
 409                 /*
 410                  * Make sure this entry has a unique name.
 411                  */
 412                 for (tpfe = __pw_get_head (); NULL != tpfe; tpfe = tpfe->next) {
 413                         const struct passwd *ent = tpfe->eptr;
 414
 415                         /*
 416                          * Don't check this entry
 417                          */
 418                         if (tpfe == pfe) {
 419                                 continue;
 420                         }
 421
 422                         /*
 423                          * Don't check invalid entries.
 424                          */
 425                         if (NULL == ent) {
 426                                 continue;
 427                         }
 428
 429                         if (strcmp (pwd->pw_name, ent->pw_name) != 0) {
 430                                 continue;
 431                         }
 432
 433                         /*
 434                          * Tell the user this entry is a duplicate of
 435                          * another and ask them to delete it.
 436                          */
 437                         puts (_("duplicate password entry"));
 438                         printf (_("delete line '%s'? "), pfe->line);
 439                         *errors += 1;
 440
 441                         /*
 442                          * prompt the user to delete the entry or not
 443                          */
 444                         if (yes_or_no (read_only)) {
 445                                 goto delete_pw;
 446                         }
 447                 }
 448
 449                 /*
 450                  * Check for invalid usernames.  --marekm
 451                  */
 452                 if (!is_valid_user_name (pwd->pw_name)) {
 453                         printf (_("invalid user name '%s'\n"), pwd->pw_name);
 454                         *errors += 1;
 455                 }
 456
 457                 /*
 458                  * Check for invalid user ID.
 459                  */
 460                 if (pwd->pw_uid == (uid_t)-1) {
 461                         printf (_("invalid user ID '%lu'\n"), (long unsigned int)pwd->pw_uid);
 462                         *errors += 1;
 463                 }
 464
 465                 /*
 466                  * Make sure the primary group exists
 467                  */
 468                 /* local, no need for xgetgrgid */
 469                 if (!quiet && (NULL == getgrgid (pwd->pw_gid))) {
 470
 471                         /*
 472                          * No primary group, just give a warning
 473                          */
 474
 475                         printf (_("user '%s': no group %lu\n"),
 476                                 pwd->pw_name, (unsigned long) pwd->pw_gid);
 477                         *errors += 1;
 478                 }
 479
 480                 /*
 481                  * Make sure the home directory exists
 482                  */
 483                 if (!quiet && (access (pwd->pw_dir, F_OK) != 0)) {
 484                         /*
 485                          * Home directory doesn't exist, give a warning
 486                          */
 487                         printf (_("user '%s': directory '%s' does not exist\n"),
 488                                 pwd->pw_name, pwd->pw_dir);
 489                         *errors += 1;
 490                 }
 491
 492                 /*
 493                  * Make sure the login shell is executable
 494                  */
 495                 if (   !quiet
 496                     && ('\0' != pwd->pw_shell[0])
 497                     && (access (pwd->pw_shell, F_OK) != 0)) {
 498
 499                         /*
 500                          * Login shell doesn't exist, give a warning
 501                          */
 502                         printf (_("user '%s': program '%s' does not exist\n"),
 503                                 pwd->pw_name, pwd->pw_shell);
 504                         *errors += 1;
 505                 }
 506
 507                 /*
 508                  * Make sure this entry exists in the /etc/shadow file.
 509                  */
 510
 511                 if (is_shadow) {
 512 #ifdef WITH_TCB
 513                         if (getdef_bool ("USE_TCB")) {
 514                                 if (shadowtcb_set_user (pwd->pw_name) == SHADOWTCB_FAILURE) {
 515                                         printf (_("no tcb directory for %s\n"),
 516                                                 pwd->pw_name);
 517                                         printf (_("create tcb directory for %s?"),
 518                                                 pwd->pw_name);
 519                                         *errors += 1;
 520                                         if (yes_or_no (read_only)) {
 521                                                 if (shadowtcb_create (pwd->pw_name, pwd->pw_uid) == SHADOWTCB_FAILURE) {
 522                                                         *errors += 1;
 523                                                         printf (_("failed to create tcb directory for %s\n"), pwd->pw_name);
 524                                                         continue;
 525                                                 }
 526                                         } else {
 527                                                 continue;
 528                                         }
 529                                 }
 530                                 if (spw_lock () == 0) {
 531                                         *errors += 1;
 532                                         fprintf (stderr,
 533                                                  _("%s: cannot lock %s.\n"),
 534                                                  Prog, spw_dbname ());
 535                                         continue;
 536                                 }
 537                                 spw_locked = true;
 538                                 if (spw_open (read_only ? O_RDONLY : O_RDWR) == 0) {
 539                                         fprintf (stderr,
 540                                                  _("%s: cannot open %s\n"),
 541                                                  Prog, spw_dbname ());
 542                                         *errors += 1;
 543                                         if (spw_unlock () == 0) {
 544                                                 fprintf (stderr,
 545                                                          _("%s: failed to unlock %s\n"),
 546                                                          Prog, spw_dbname ());
 547                                                 if (use_system_spw_file) {
 548                                                         SYSLOG ((LOG_ERR,
 549                                                                  "failed to unlock %s",
 550                                                                  spw_dbname ()));
 551                                                 }
 552                                         }
 553                                         continue;
 554                                 }
 555                                 spw_opened = true;
 556                         }
 557 #endif                          /* WITH_TCB */
 558                         spw = (struct spwd *) spw_locate (pwd->pw_name);
 559                         if (NULL == spw) {
 560                                 printf (_("no matching password file entry in %s\n"),
 561                                         spw_dbname ());
 562                                 printf (_("add user '%s' in %s? "),
 563                                         pwd->pw_name, spw_dbname ());
 564                                 *errors += 1;
 565                                 if (yes_or_no (read_only)) {
 566                                         struct spwd sp;
 567                                         struct passwd pw;
 568
 569                                         sp.sp_namp   = pwd->pw_name;
 570                                         sp.sp_pwdp   = pwd->pw_passwd;
 571                                         sp.sp_min    =
 572                                             getdef_num ("PASS_MIN_DAYS", -1);
 573                                         sp.sp_max    =
 574                                             getdef_num ("PASS_MAX_DAYS", -1);
 575                                         sp.sp_warn   =
 576                                             getdef_num ("PASS_WARN_AGE", -1);
 577                                         sp.sp_inact  = -1;
 578                                         sp.sp_expire = -1;
 579                                         sp.sp_flag   = SHADOW_SP_FLAG_UNSET;
 580                                         sp.sp_lstchg = (long) time ((time_t *) 0) / SCALE;
 581                                         if (0 == sp.sp_lstchg) {
 582                                                 /* Better disable aging than
 583                                                  * requiring a password change
 584                                                  */
 585                                                 sp.sp_lstchg = -1;
 586                                         }
 587                                         *changed = true;
 588
 589                                         if (spw_update (&sp) == 0) {
 590                                                 fprintf (stderr,
 591                                                          _("%s: failed to prepare the new %s entry '%s'\n"),
 592                                                          Prog, spw_dbname (), sp.sp_namp);
 593                                                 fail_exit (E_CANTUPDATE);
 594                                         }
 595                                         /* remove password from /etc/passwd */
 596                                         pw = *pwd;
 597                                         pw.pw_passwd = SHADOW_PASSWD_STRING;    /* XXX warning: const */
 598                                         if (pw_update (&pw) == 0) {
 599                                                 fprintf (stderr,
 600                                                          _("%s: failed to prepare the new %s entry '%s'\n"),
 601                                                          Prog, pw_dbname (), pw.pw_name);
 602                                                 fail_exit (E_CANTUPDATE);
 603                                         }
 604                                 }
 605                         } else {
 606                                 /* The passwd entry has a shadow counterpart.
 607                                  * Make sure no passwords are in passwd.
 608                                  */
 609                                 if (strcmp (pwd->pw_passwd, SHADOW_PASSWD_STRING) != 0) {
 610                                         printf (_("user %s has an entry in %s, but its password field in %s is not set to 'x'\n"),
 611                                                 pwd->pw_name, spw_dbname (), pw_dbname ());
 612                                         *errors += 1;
 613                                 }
 614                         }
 615                 }
 616 #ifdef WITH_TCB
 617                 if (getdef_bool ("USE_TCB") && spw_locked) {
 618                         if (spw_opened && (spw_close () == 0)) {
 619                                 fprintf (stderr,
 620                                          _("%s: failure while writing changes to %s\n"),
 621                                          Prog, spw_dbname ());
 622                                 if (use_system_spw_file) {
 623                                         SYSLOG ((LOG_ERR,
 624                                                  "failure while writing changes to %s",
 625                                                  spw_dbname ()));
 626                                 }
 627                         } else {
 628                                 spw_opened = false;
 629                         }
 630                         if (spw_unlock () == 0) {
 631                                 fprintf (stderr,
 632                                          _("%s: failed to unlock %s\n"),
 633                                          Prog, spw_dbname ());
 634                                 if (use_system_spw_file) {
 635                                         SYSLOG ((LOG_ERR, "failed to unlock %s",
 636                                                  spw_dbname ()));
 637                                 }
 638                         } else {
 639                                 spw_locked = false;
 640                         }
 641                 }
 642 #endif                          /* WITH_TCB */
 643         }
 644 }
 645
 646 /*
 647  * check_spw_file - check the content of the shadowed password file (shadow)
 648  */
 649 static void check_spw_file (int *errors, bool *changed)
 650 {
 651         struct commonio_entry *spe, *tspe;
 652         struct spwd *spw;
 653
 654         /*
 655          * Loop through the entire shadow password file.
 656          */
 657         for (spe = __spw_get_head (); NULL != spe; spe = spe->next) {
 658                 /*
 659                  * Do not treat lines which were missing in shadow
 660                  * and were added earlier.
 661                  */
 662                 if (NULL == spe->line) {
 663                         continue;
 664                 }
 665
 666                 /*
 667                  * If this is a NIS line, skip it. You can't "know" what NIS
 668                  * is going to do without directly asking NIS ...
 669                  */
 670                 if (('+' == spe->line[0]) || ('-' == spe->line[0])) {
 671                         continue;
 672                 }
 673
 674                 /*
 675                  * Start with the entries that are completely corrupt. They
 676                  * have no (struct spwd) entry because they couldn't be
 677                  * parsed properly.
 678                  */
 679                 if (NULL == spe->eptr) {
 680                         /*
 681                          * Tell the user this entire line is bogus and ask
 682                          * them to delete it.
 683                          */
 684                         puts (_("invalid shadow password file entry"));
 685                         printf (_("delete line '%s'? "), spe->line);
 686                         *errors += 1;
 687
 688                         /*
 689                          * prompt the user to delete the entry or not
 690                          */
 691                         if (!yes_or_no (read_only)) {
 692                                 continue;
 693                         }
 694
 695                         /*
 696                          * All shadow file deletions wind up here. This code
 697                          * removes the current entry from the linked list.
 698                          * When done, it skips back to the top of the loop
 699                          * to try out the next list element.
 700                          */
 701                       delete_spw:
 702                         if (use_system_spw_file) {
 703                                 SYSLOG ((LOG_INFO, "delete shadow line '%s'",
 704                                          spe->line));
 705                         }
 706                         *changed = true;
 707
 708                         __spw_del_entry (spe);
 709                         continue;
 710                 }
 711
 712                 /*
 713                  * Shadow password structure is good, start using it.
 714                  */
 715                 spw = spe->eptr;
 716
 717                 /*
 718                  * Make sure this entry has a unique name.
 719                  */
 720                 for (tspe = __spw_get_head (); NULL != tspe; tspe = tspe->next) {
 721                         const struct spwd *ent = tspe->eptr;
 722
 723                         /*
 724                          * Don't check this entry
 725                          */
 726                         if (tspe == spe) {
 727                                 continue;
 728                         }
 729
 730                         /*
 731                          * Don't check invalid entries.
 732                          */
 733                         if (NULL == ent) {
 734                                 continue;
 735                         }
 736
 737                         if (strcmp (spw->sp_namp, ent->sp_namp) != 0) {
 738                                 continue;
 739                         }
 740
 741                         /*
 742                          * Tell the user this entry is a duplicate of
 743                          * another and ask them to delete it.
 744                          */
 745                         puts (_("duplicate shadow password entry"));
 746                         printf (_("delete line '%s'? "), spe->line);
 747                         *errors += 1;
 748
 749                         /*
 750                          * prompt the user to delete the entry or not
 751                          */
 752                         if (yes_or_no (read_only)) {
 753                                 goto delete_spw;
 754                         }
 755                 }
 756
 757                 /*
 758                  * Make sure this entry exists in the /etc/passwd
 759                  * file.
 760                  */
 761                 if (pw_locate (spw->sp_namp) == NULL) {
 762                         /*
 763                          * Tell the user this entry has no matching
 764                          * /etc/passwd entry and ask them to delete it.
 765                          */
 766                         printf (_("no matching password file entry in %s\n"),
 767                                 pw_dbname ());
 768                         printf (_("delete line '%s'? "), spe->line);
 769                         *errors += 1;
 770
 771                         /*
 772                          * prompt the user to delete the entry or not
 773                          */
 774                         if (yes_or_no (read_only)) {
 775                                 goto delete_spw;
 776                         }
 777                 }
 778
 779                 /*
 780                  * Warn if last password change in the future.  --marekm
 781                  */
 782                 if (   !quiet
 783                     && (spw->sp_lstchg > (long) time ((time_t *) 0) / SCALE)) {
 784                         printf (_("user %s: last password change in the future\n"),
 785                                 spw->sp_namp);
 786                         *errors += 1;
 787                 }
 788         }
 789 }
 790
 791 /*
 792  * pwck - verify password file integrity
 793  */
 794 int main (int argc, char **argv)
 795 {
 796         int errors = 0;
 797         bool changed = false;
 798
 799         /*
 800          * Get my name so that I can use it to report errors.
 801          */
 802         Prog = Basename (argv[0]);
 803
 804         (void) setlocale (LC_ALL, "");
 805         (void) bindtextdomain (PACKAGE, LOCALEDIR);
 806         (void) textdomain (PACKAGE);
 807
 808         OPENLOG ("pwck");
 809
 810         /* Parse the command line arguments */
 811         process_flags (argc, argv);
 812
 813         open_files ();
 814
 815         if (sort_mode) {
 816                 if (pw_sort () != 0) {
 817                         fprintf (stderr,
 818                                  _("%s: cannot sort entries in %s\n"),
 819                                  Prog, pw_dbname ());
 820                         fail_exit (E_CANTSORT);
 821                 }
 822                 if (is_shadow) {
 823                         if (spw_sort () != 0) {
 824                                 fprintf (stderr,
 825                                          _("%s: cannot sort entries in %s\n"),
 826                                          Prog, spw_dbname ());
 827                                 fail_exit (E_CANTSORT);
 828                         }
 829                 }
 830                 changed = true;
 831         } else {
 832                 check_pw_file (&errors, &changed);
 833
 834                 if (is_shadow) {
 835                         check_spw_file (&errors, &changed);
 836                 }
 837         }
 838
 839         close_files (changed);
 840
 841         nscd_flush_cache ("passwd");
 842
 843         /*
 844          * Tell the user what we did and exit.
 845          */
 846         if (0 != errors) {
 847                 printf (changed ?
 848                         _("%s: the files have been updated\n") :
 849                         _("%s: no changes\n"), Prog);
 850         }
 851
 852         closelog ();
 853         return ((0 != errors) ? E_BADENTRY : E_OKAY);
 854 }
 855