/* * Copyright 1992 - 1994, Julianne Frances Haugh * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of Julianne F. Haugh nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #ident "$Id: pwck.c,v 1.33 2006/01/18 19:55:15 kloczek Exp $" #include #include #include #include #include "chkname.h" #include "commonio.h" #include "defines.h" #include "prototypes.h" #include "pwio.h" #include "shadowio.h" #include "nscd.h" extern void __pw_del_entry (const struct commonio_entry *); extern struct commonio_entry *__pw_get_head (void); extern void __spw_del_entry (const struct commonio_entry *); extern struct commonio_entry *__spw_get_head (void); /* * Exit codes */ #define E_OKAY 0 #define E_USAGE 1 #define E_BADENTRY 2 #define E_CANTOPEN 3 #define E_CANTLOCK 4 #define E_CANTUPDATE 5 /* * Global variables */ static char *Prog; static const char *pwd_file = PASSWD_FILE; static const char *spw_file = SHADOW_FILE; static int read_only = 0; static int quiet = 0; /* don't report warnings, only errors */ /* local function prototypes */ static void usage (void); static int yes_or_no (void); /* * usage - print syntax message and exit */ static void usage (void) { fprintf (stderr, _("Usage: %s [-q] [-r] [-s] [passwd [shadow]]\n"), Prog); exit (E_USAGE); } /* * yes_or_no - get answer to question from the user */ static int yes_or_no (void) { char buf[80]; /* * In read-only mode all questions are answered "no". */ if (read_only) { printf (_("No\n")); return 0; } /* * Get a line and see what the first character is. */ if (fgets (buf, sizeof buf, stdin)) return buf[0] == 'y' || buf[0] == 'Y'; return 0; } /* * pwck - verify password file integrity */ int main (int argc, char **argv) { int arg; int errors = 0; int deleted = 0; struct commonio_entry *pfe, *tpfe; struct passwd *pwd; int sort_mode = 0; struct commonio_entry *spe, *tspe; struct spwd *spw; int is_shadow = 0; /* * Get my name so that I can use it to report errors. */ Prog = Basename (argv[0]); setlocale (LC_ALL, ""); bindtextdomain (PACKAGE, LOCALEDIR); textdomain (PACKAGE); OPENLOG ("pwck"); /* * Parse the command line arguments */ while ((arg = getopt (argc, argv, "eqrs")) != EOF) { switch (arg) { case 'e': /* added for Debian shadow-961025-2 compatibility */ case 'q': quiet = 1; break; case 'r': read_only = 1; break; case 's': sort_mode = 1; break; default: usage (); } } if (sort_mode && read_only) { fprintf (stderr, _("%s: -s and -r are incompatibile\n"), Prog); exit (E_USAGE); } /* * Make certain we have the right number of arguments */ if (optind != argc && optind + 1 != argc && optind + 2 != argc) usage (); /* * If there are two left over filenames, use those as the password * and shadow password filenames. */ if (optind != argc) { pwd_file = argv[optind]; pw_name (pwd_file); } if (optind + 2 == argc) { spw_file = argv[optind + 1]; spw_name (spw_file); is_shadow = 1; } else if (optind == argc) is_shadow = spw_file_present (); /* * Lock the files if we aren't in "read-only" mode */ if (!read_only) { if (!pw_lock ()) { fprintf (stderr, _("%s: cannot lock file %s\n"), Prog, pwd_file); if (optind == argc) SYSLOG ((LOG_WARN, "cannot lock %s", pwd_file)); closelog (); exit (E_CANTLOCK); } if (is_shadow && !spw_lock ()) { fprintf (stderr, _("%s: cannot lock file %s\n"), Prog, spw_file); if (optind == argc) SYSLOG ((LOG_WARN, "cannot lock %s", spw_file)); closelog (); exit (E_CANTLOCK); } } /* * Open the files. Use O_RDONLY if we are in read_only mode, O_RDWR * otherwise. */ if (!pw_open (read_only ? O_RDONLY : O_RDWR)) { fprintf (stderr, _("%s: cannot open file %s\n"), Prog, pwd_file); if (optind == argc) SYSLOG ((LOG_WARN, "cannot open %s", pwd_file)); closelog (); exit (E_CANTOPEN); } if (is_shadow && !spw_open (read_only ? O_RDONLY : O_RDWR)) { fprintf (stderr, _("%s: cannot open file %s\n"), Prog, spw_file); if (optind == argc) SYSLOG ((LOG_WARN, "cannot open %s", spw_file)); closelog (); exit (E_CANTOPEN); } if (sort_mode) { pw_sort (); if (is_shadow) spw_sort (); goto write_and_bye; } /* * Loop through the entire password file. */ for (pfe = __pw_get_head (); pfe; pfe = pfe->next) { /* * If this is a NIS line, skip it. You can't "know" what NIS * is going to do without directly asking NIS ... */ if (pfe->line[0] == '+' || pfe->line[0] == '-') continue; /* * Start with the entries that are completely corrupt. They * have no (struct passwd) entry because they couldn't be * parsed properly. */ if (!pfe->eptr) { /* * Tell the user this entire line is bogus and ask * them to delete it. */ printf (_("invalid password file entry\n")); printf (_("delete line `%s'? "), pfe->line); errors++; /* * prompt the user to delete the entry or not */ if (!yes_or_no ()) continue; /* * All password file deletions wind up here. This * code removes the current entry from the linked * list. When done, it skips back to the top of the * loop to try out the next list element. */ delete_pw: SYSLOG ((LOG_INFO, "delete passwd line `%s'", pfe->line)); deleted++; __pw_del_entry (pfe); continue; } /* * Password structure is good, start using it. */ pwd = pfe->eptr; /* * Make sure this entry has a unique name. */ for (tpfe = __pw_get_head (); tpfe; tpfe = tpfe->next) { const struct passwd *ent = tpfe->eptr; /* * Don't check this entry */ if (tpfe == pfe) continue; /* * Don't check invalid entries. */ if (!ent) continue; if (strcmp (pwd->pw_name, ent->pw_name) != 0) continue; /* * Tell the user this entry is a duplicate of * another and ask them to delete it. */ printf (_("duplicate password entry\n")); printf (_("delete line `%s'? "), pfe->line); errors++; /* * prompt the user to delete the entry or not */ if (yes_or_no ()) goto delete_pw; } /* * Check for invalid usernames. --marekm */ if (!check_user_name (pwd->pw_name)) { printf (_("invalid user name '%s'\n"), pwd->pw_name); errors++; } /* * Make sure the primary group exists */ if (!quiet && !getgrgid (pwd->pw_gid)) { /* * No primary group, just give a warning */ printf (_("user %s: no group %u\n"), pwd->pw_name, pwd->pw_gid); errors++; } /* * Make sure the home directory exists */ if (!quiet && access (pwd->pw_dir, F_OK)) { /* * Home directory doesn't exist, give a warning */ printf (_ ("user %s: directory %s does not exist\n"), pwd->pw_name, pwd->pw_dir); errors++; } /* * Make sure the login shell is executable */ if (!quiet && pwd->pw_shell[0] && access (pwd->pw_shell, F_OK)) { /* * Login shell doesn't exist, give a warning */ printf (_("user %s: program %s does not exist\n"), pwd->pw_name, pwd->pw_shell); errors++; } } if (!is_shadow) goto shadow_done; /* * Loop through the entire shadow password file. */ for (spe = __spw_get_head (); spe; spe = spe->next) { /* * If this is a NIS line, skip it. You can't "know" what NIS * is going to do without directly asking NIS ... */ if (spe->line[0] == '+' || spe->line[0] == '-') continue; /* * Start with the entries that are completely corrupt. They * have no (struct spwd) entry because they couldn't be * parsed properly. */ if (!spe->eptr) { /* * Tell the user this entire line is bogus and ask * them to delete it. */ printf (_("invalid shadow password file entry\n")); printf (_("delete line `%s'? "), spe->line); errors++; /* * prompt the user to delete the entry or not */ if (!yes_or_no ()) continue; /* * All shadow file deletions wind up here. This code * removes the current entry from the linked list. * When done, it skips back to the top of the loop * to try out the next list element. */ delete_spw: SYSLOG ((LOG_INFO, "delete shadow line `%s'", spe->line)); deleted++; __spw_del_entry (spe); continue; } /* * Shadow password structure is good, start using it. */ spw = spe->eptr; /* * Make sure this entry has a unique name. */ for (tspe = __spw_get_head (); tspe; tspe = tspe->next) { const struct spwd *ent = tspe->eptr; /* * Don't check this entry */ if (tspe == spe) continue; /* * Don't check invalid entries. */ if (!ent) continue; if (strcmp (spw->sp_namp, ent->sp_namp) != 0) continue; /* * Tell the user this entry is a duplicate of * another and ask them to delete it. */ printf (_("duplicate shadow password entry\n")); printf (_("delete line `%s'? "), spe->line); errors++; /* * prompt the user to delete the entry or not */ if (yes_or_no ()) goto delete_spw; } /* * Make sure this entry exists in the /etc/passwd * file. */ if (!pw_locate (spw->sp_namp)) { /* * Tell the user this entry has no matching * /etc/passwd entry and ask them to delete it. */ printf (_("no matching password file entry\n")); printf (_("delete line `%s'? "), spe->line); errors++; /* * prompt the user to delete the entry or not */ if (yes_or_no ()) goto delete_spw; } /* * Warn if last password change in the future. --marekm */ if (!quiet && spw->sp_lstchg > time ((time_t *) 0) / SCALE) { printf (_ ("user %s: last password change in the future\n"), spw->sp_namp); errors++; } } shadow_done: /* * All done. If there were no deletions we can just abandon any * changes to the files. */ if (deleted) { write_and_bye: if (!pw_close ()) { fprintf (stderr, _("%s: cannot update file %s\n"), Prog, pwd_file); SYSLOG ((LOG_WARN, "cannot update %s", pwd_file)); closelog (); exit (E_CANTUPDATE); } if (is_shadow && !spw_close ()) { fprintf (stderr, _("%s: cannot update file %s\n"), Prog, spw_file); SYSLOG ((LOG_WARN, "cannot update %s", spw_file)); closelog (); exit (E_CANTUPDATE); } } /* * Don't be anti-social - unlock the files when you're done. */ if (is_shadow) spw_unlock (); (void) pw_unlock (); nscd_flush_cache ("passwd"); /* * Tell the user what we did and exit. */ if (errors) printf (deleted ? _("%s: the files have been updated\n") : _("%s: no changes\n"), Prog); closelog (); exit (errors ? E_BADENTRY : E_OKAY); }