Adding upstream version 1:4.5.upstream/1%4.5upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 893 insertions, 0 deletions

diff --git a/src/pwck.c b/src/pwck.c
new file mode 100644
index 0000000..523135f
--- /dev/null
+++ b/src/pwck.c
@@ -0,0 +1,893 @@
+/*
+ * Copyright (c) 1992 - 1994, Julianne Frances Haugh
+ * Copyright (c) 1996 - 2000, Marek Michałkiewicz
+ * Copyright (c) 2001       , Michał Moskal
+ * Copyright (c) 2001 - 2006, Tomasz Kłoczko
+ * Copyright (c) 2007 - 2011, Nicolas François
+ * 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. The name of the copyright holders or contributors may not be used to
+ *    endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 THE COPYRIGHT
+ * HOLDERS 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 <config.h>
+
+#ident "$Id$"
+
+#include <fcntl.h>
+#include <grp.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <getopt.h>
+#include "chkname.h"
+#include "commonio.h"
+#include "defines.h"
+#include "prototypes.h"
+#include "pwio.h"
+#include "shadowio.h"
+#include "getdef.h"
+#include "nscd.h"
+#ifdef WITH_TCB
+#include "tcbfuncs.h"
+#endif				/* WITH_TCB */
+
+/*
+ * Exit codes
+ */
+/*@-exitarg@*/
+#define	E_OKAY		0
+#define	E_SUCCESS	0
+#define	E_USAGE		1
+#define	E_BADENTRY	2
+#define	E_CANTOPEN	3
+#define	E_CANTLOCK	4
+#define	E_CANTUPDATE	5
+#define	E_CANTSORT	6
+
+/*
+ * Global variables
+ */
+const char *Prog;
+
+static bool use_system_pw_file = true;
+static bool use_system_spw_file = true;
+
+static bool is_shadow = false;
+
+static bool spw_opened = false;
+
+static bool pw_locked  = false;
+static bool spw_locked = false;
+
+/* Options */
+static bool read_only = false;
+static bool sort_mode = false;
+static bool quiet = false;		/* don't report warnings, only errors */
+
+/* local function prototypes */
+static void fail_exit (int code);
+static /*@noreturn@*/void usage (int status);
+static void process_flags (int argc, char **argv);
+static void open_files (void);
+static void close_files (bool changed);
+static void check_pw_file (int *errors, bool *changed);
+static void check_spw_file (int *errors, bool *changed);
+
+/*
+ * fail_exit - do some cleanup and exit with the given error code
+ */
+static void fail_exit (int code)
+{
+	if (spw_locked) {
+		if (spw_unlock () == 0) {
+			fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, spw_dbname ());
+			if (use_system_spw_file) {
+				SYSLOG ((LOG_ERR, "failed to unlock %s",
+				         spw_dbname ()));
+			}
+			/* continue */
+		}
+	}
+
+	if (pw_locked) {
+		if (pw_unlock () == 0) {
+			fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, pw_dbname ());
+			if (use_system_pw_file) {
+				SYSLOG ((LOG_ERR, "failed to unlock %s",
+				         pw_dbname ()));
+			}
+			/* continue */
+		}
+	}
+
+	closelog ();
+
+	exit (code);
+}
+/*
+ * usage - print syntax message and exit
+ */
+static /*@noreturn@*/void usage (int status)
+{
+	FILE *usageout = (E_SUCCESS != status) ? stderr : stdout;
+#ifdef WITH_TCB
+	if (getdef_bool ("USE_TCB")) {
+		(void) fprintf (usageout,
+		                _("Usage: %s [options] [passwd]\n"
+		                  "\n"
+		                  "Options:\n"),
+		                Prog);
+	} else
+#endif				/* WITH_TCB */
+	{
+		(void) fprintf (usageout,
+		                _("Usage: %s [options] [passwd [shadow]]\n"
+		                  "\n"
+		                  "Options:\n"),
+		                Prog);
+	}
+	(void) fputs (_("  -h, --help                    display this help message and exit\n"), usageout);
+	(void) fputs (_("  -q, --quiet                   report errors only\n"), usageout);
+	(void) fputs (_("  -r, --read-only               display errors and warnings\n"
+	                "                                but do not change files\n"), usageout);
+	(void) fputs (_("  -R, --root CHROOT_DIR         directory to chroot into\n"), usageout);
+#ifdef WITH_TCB
+	if (!getdef_bool ("USE_TCB"))
+#endif				/* !WITH_TCB */
+	{
+		(void) fputs (_("  -s, --sort                    sort entries by UID\n"), usageout);
+	}
+	(void) fputs ("\n", usageout);
+	exit (status);
+}
+
+/*
+ * process_flags - parse the command line options
+ *
+ *	It will not return if an error is encountered.
+ */
+static void process_flags (int argc, char **argv)
+{
+	int c;
+	static struct option long_options[] = {
+		{"help",      no_argument,       NULL, 'h'},
+		{"quiet",     no_argument,       NULL, 'q'},
+		{"read-only", no_argument,       NULL, 'r'},
+		{"root",      required_argument, NULL, 'R'},
+		{"sort",      no_argument,       NULL, 's'},
+		{NULL, 0, NULL, '\0'}
+	};
+
+	/*
+	 * Parse the command line arguments
+	 */
+	while ((c = getopt_long (argc, argv, "ehqrR:s",
+	                         long_options, NULL)) != -1) {
+		switch (c) {
+		case 'h':
+			usage (E_SUCCESS);
+			/*@notreached@*/break;
+		case 'e':	/* added for Debian shadow-961025-2 compatibility */
+		case 'q':
+			quiet = true;
+			break;
+		case 'r':
+			read_only = true;
+			break;
+		case 'R': /* no-op, handled in process_root_flag () */
+			break;
+		case 's':
+			sort_mode = true;
+			break;
+		default:
+			usage (E_USAGE);
+		}
+	}
+
+	if (sort_mode && read_only) {
+		fprintf (stderr, _("%s: -s and -r are incompatible\n"), Prog);
+		exit (E_USAGE);
+	}
+
+	/*
+	 * Make certain we have the right number of arguments
+	 */
+	if (argc > (optind + 2)) {
+		usage (E_USAGE);
+	}
+
+	/*
+	 * If there are two left over filenames, use those as the password
+	 * and shadow password filenames.
+	 */
+	if (optind != argc) {
+		pw_setdbname (argv[optind]);
+		use_system_pw_file = false;
+	}
+	if ((optind + 2) == argc) {
+#ifdef WITH_TCB
+		if (getdef_bool ("USE_TCB")) {
+			fprintf (stderr,
+			         _("%s: no alternative shadow file allowed when USE_TCB is enabled.\n"),
+			         Prog);
+			usage (E_USAGE);
+		}
+#endif				/* WITH_TCB */
+		spw_setdbname (argv[optind + 1]);
+		is_shadow = true;
+		use_system_spw_file = false;
+	} else if (optind == argc) {
+		is_shadow = spw_file_present ();
+	}
+}
+
+/*
+ * open_files - open the shadow database
+ *
+ *	In read-only mode, the databases are not locked and are opened
+ *	only for reading.
+ */
+static void open_files (void)
+{
+	bool use_tcb = false;
+#ifdef WITH_TCB
+	use_tcb = getdef_bool ("USE_TCB");
+#endif				/* WITH_TCB */
+
+	/*
+	 * Lock the files if we aren't in "read-only" mode
+	 */
+	if (!read_only) {
+		if (pw_lock () == 0) {
+			fprintf (stderr,
+			         _("%s: cannot lock %s; try again later.\n"),
+			         Prog, pw_dbname ());
+			fail_exit (E_CANTLOCK);
+		}
+		pw_locked = true;
+		if (is_shadow && !use_tcb) {
+			if (spw_lock () == 0) {
+				fprintf (stderr,
+				         _("%s: cannot lock %s; try again later.\n"),
+				         Prog, spw_dbname ());
+				fail_exit (E_CANTLOCK);
+			}
+			spw_locked = true;
+		}
+	}
+
+	/*
+	 * Open the files. Use O_RDONLY if we are in read_only mode, O_RDWR
+	 * otherwise.
+	 */
+	if (pw_open (read_only ? O_RDONLY : O_CREAT | O_RDWR) == 0) {
+		fprintf (stderr, _("%s: cannot open %s\n"),
+		         Prog, pw_dbname ());
+		if (use_system_pw_file) {
+			SYSLOG ((LOG_WARN, "cannot open %s", pw_dbname ()));
+		}
+		fail_exit (E_CANTOPEN);
+	}
+	if (is_shadow && !use_tcb) {
+		if (spw_open (read_only ? O_RDONLY : O_CREAT | O_RDWR) == 0) {
+			fprintf (stderr, _("%s: cannot open %s\n"),
+			         Prog, spw_dbname ());
+			if (use_system_spw_file) {
+				SYSLOG ((LOG_WARN, "cannot open %s",
+				         spw_dbname ()));
+			}
+			fail_exit (E_CANTOPEN);
+		}
+		spw_opened = true;
+	}
+}
+
+/*
+ * close_files - close and unlock the password/shadow databases
+ *
+ *	If changed is not set, the databases are not closed, and no
+ *	changes are committed in the databases. The databases are
+ *	unlocked anyway.
+ */
+static void close_files (bool changed)
+{
+	/*
+	 * All done. If there were no change we can just abandon any
+	 * changes to the files.
+	 */
+	if (changed) {
+		if (pw_close () == 0) {
+			fprintf (stderr,
+			         _("%s: failure while writing changes to %s\n"),
+			         Prog, pw_dbname ());
+			if (use_system_pw_file) {
+				SYSLOG ((LOG_ERR,
+				         "failure while writing changes to %s",
+				         pw_dbname ()));
+			}
+			fail_exit (E_CANTUPDATE);
+		}
+		if (spw_opened && (spw_close () == 0)) {
+			fprintf (stderr,
+			         _("%s: failure while writing changes to %s\n"),
+			         Prog, spw_dbname ());
+			if (use_system_spw_file) {
+				SYSLOG ((LOG_ERR,
+				         "failure while writing changes to %s",
+				         spw_dbname ()));
+			}
+			fail_exit (E_CANTUPDATE);
+		}
+		spw_opened = false;
+	}
+
+	/*
+	 * Don't be anti-social - unlock the files when you're done.
+	 */
+	if (spw_locked) {
+		if (spw_unlock () == 0) {
+			fprintf (stderr,
+			         _("%s: failed to unlock %s\n"),
+			         Prog, spw_dbname ());
+			if (use_system_spw_file) {
+				SYSLOG ((LOG_ERR, "failed to unlock %s",
+				         spw_dbname ()));
+			}
+			/* continue */
+		}
+	}
+	spw_locked = false;
+	if (pw_locked) {
+		if (pw_unlock () == 0) {
+			fprintf (stderr,
+			         _("%s: failed to unlock %s\n"),
+			         Prog, pw_dbname ());
+			if (use_system_pw_file) {
+				SYSLOG ((LOG_ERR, "failed to unlock %s",
+				         pw_dbname ()));
+			}
+			/* continue */
+		}
+	}
+	pw_locked = false;
+}
+
+/*
+ * check_pw_file - check the content of the passwd file
+ */
+static void check_pw_file (int *errors, bool *changed)
+{
+	struct commonio_entry *pfe, *tpfe;
+	struct passwd *pwd;
+	struct spwd *spw;
+
+	/*
+	 * Loop through the entire password file.
+	 */
+	for (pfe = __pw_get_head (); NULL != 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 (NULL == pfe->eptr) {
+			/*
+			 * Tell the user this entire line is bogus and ask
+			 * them to delete it.
+			 */
+			puts (_("invalid password file entry"));
+			printf (_("delete line '%s'? "), pfe->line);
+			*errors += 1;
+
+			/*
+			 * prompt the user to delete the entry or not
+			 */
+			if (!yes_or_no (read_only)) {
+				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:
+			if (use_system_pw_file) {
+				SYSLOG ((LOG_INFO, "delete passwd line '%s'",
+				         pfe->line));
+			}
+			*changed = true;
+
+			__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 (); NULL != 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 (NULL == 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.
+			 */
+			puts (_("duplicate password entry"));
+			printf (_("delete line '%s'? "), pfe->line);
+			*errors += 1;
+
+			/*
+			 * prompt the user to delete the entry or not
+			 */
+			if (yes_or_no (read_only)) {
+				goto delete_pw;
+			}
+		}
+
+		/*
+		 * Check for invalid usernames.  --marekm
+		 */
+		if (!is_valid_user_name (pwd->pw_name)) {
+			printf (_("invalid user name '%s'\n"), pwd->pw_name);
+			*errors += 1;
+		}
+
+		/*
+		 * Check for invalid user ID.
+		 */
+		if (pwd->pw_uid == (uid_t)-1) {
+			printf (_("invalid user ID '%lu'\n"), (long unsigned int)pwd->pw_uid);
+			*errors += 1;
+		}
+
+		/*
+		 * Make sure the primary group exists
+		 */
+		/* local, no need for xgetgrgid */
+		if (!quiet && (NULL == getgrgid (pwd->pw_gid))) {
+
+			/*
+			 * No primary group, just give a warning
+			 */
+
+			printf (_("user '%s': no group %lu\n"),
+			        pwd->pw_name, (unsigned long) pwd->pw_gid);
+			*errors += 1;
+		}
+
+		/*
+		 * Make sure the home directory exists
+		 */
+		if (!quiet && (access (pwd->pw_dir, F_OK) != 0)) {
+			/*
+			 * Home directory doesn't exist, give a warning
+			 */
+			printf (_("user '%s': directory '%s' does not exist\n"),
+			        pwd->pw_name, pwd->pw_dir);
+			*errors += 1;
+		}
+
+		/*
+		 * Make sure the login shell is executable
+		 */
+		if (   !quiet
+		    && ('\0' != pwd->pw_shell[0])
+		    && (access (pwd->pw_shell, F_OK) != 0)) {
+
+			/*
+			 * Login shell doesn't exist, give a warning
+			 */
+			printf (_("user '%s': program '%s' does not exist\n"),
+			        pwd->pw_name, pwd->pw_shell);
+			*errors += 1;
+		}
+
+		/*
+		 * Make sure this entry exists in the /etc/shadow file.
+		 */
+
+		if (is_shadow) {
+#ifdef WITH_TCB
+			if (getdef_bool ("USE_TCB")) {
+				if (shadowtcb_set_user (pwd->pw_name) == SHADOWTCB_FAILURE) {
+					printf (_("no tcb directory for %s\n"),
+					        pwd->pw_name);
+					printf (_("create tcb directory for %s?"),
+					        pwd->pw_name);
+					*errors += 1;
+					if (yes_or_no (read_only)) {
+						if (shadowtcb_create (pwd->pw_name, pwd->pw_uid) == SHADOWTCB_FAILURE) {
+							*errors += 1;
+							printf (_("failed to create tcb directory for %s\n"), pwd->pw_name);
+							continue;
+						}
+					} else {
+						continue;
+					}
+				}
+				if (spw_lock () == 0) {
+					*errors += 1;
+					fprintf (stderr,
+					         _("%s: cannot lock %s.\n"),
+					         Prog, spw_dbname ());
+					continue;
+				}
+				spw_locked = true;
+				if (spw_open (read_only ? O_RDONLY : O_CREAT | O_RDWR) == 0) {
+					fprintf (stderr,
+					         _("%s: cannot open %s\n"),
+					         Prog, spw_dbname ());
+					*errors += 1;
+					if (spw_unlock () == 0) {
+						fprintf (stderr,
+						         _("%s: failed to unlock %s\n"),
+						         Prog, spw_dbname ());
+						if (use_system_spw_file) {
+							SYSLOG ((LOG_ERR,
+							         "failed to unlock %s",
+							         spw_dbname ()));
+						}
+					}
+					continue;
+				}
+				spw_opened = true;
+			}
+#endif				/* WITH_TCB */
+			spw = (struct spwd *) spw_locate (pwd->pw_name);
+			if (NULL == spw) {
+				printf (_("no matching password file entry in %s\n"),
+				        spw_dbname ());
+				printf (_("add user '%s' in %s? "),
+				        pwd->pw_name, spw_dbname ());
+				*errors += 1;
+				if (yes_or_no (read_only)) {
+					struct spwd sp;
+					struct passwd pw;
+
+					sp.sp_namp   = pwd->pw_name;
+					sp.sp_pwdp   = pwd->pw_passwd;
+					sp.sp_min    =
+					    getdef_num ("PASS_MIN_DAYS", -1);
+					sp.sp_max    =
+					    getdef_num ("PASS_MAX_DAYS", -1);
+					sp.sp_warn   =
+					    getdef_num ("PASS_WARN_AGE", -1);
+					sp.sp_inact  = -1;
+					sp.sp_expire = -1;
+					sp.sp_flag   = SHADOW_SP_FLAG_UNSET;
+					sp.sp_lstchg = (long) time ((time_t *) 0) / SCALE;
+					if (0 == sp.sp_lstchg) {
+						/* Better disable aging than
+						 * requiring a password change
+						 */
+						sp.sp_lstchg = -1;
+					}
+					*changed = true;
+
+					if (spw_update (&sp) == 0) {
+						fprintf (stderr,
+						         _("%s: failed to prepare the new %s entry '%s'\n"),
+						         Prog, spw_dbname (), sp.sp_namp);
+						fail_exit (E_CANTUPDATE);
+					}
+					/* remove password from /etc/passwd */
+					pw = *pwd;
+					pw.pw_passwd = SHADOW_PASSWD_STRING;	/* XXX warning: const */
+					if (pw_update (&pw) == 0) {
+						fprintf (stderr,
+						         _("%s: failed to prepare the new %s entry '%s'\n"),
+						         Prog, pw_dbname (), pw.pw_name);
+						fail_exit (E_CANTUPDATE);
+					}
+				}
+			} else {
+				/* The passwd entry has a shadow counterpart.
+				 * Make sure no passwords are in passwd.
+				 */
+				if (   !quiet
+				    && (strcmp (pwd->pw_passwd,
+				                SHADOW_PASSWD_STRING) != 0)) {
+					printf (_("user %s has an entry in %s, but its password field in %s is not set to 'x'\n"),
+					        pwd->pw_name, spw_dbname (), pw_dbname ());
+					*errors += 1;
+				}
+			}
+		}
+#ifdef WITH_TCB
+		if (getdef_bool ("USE_TCB") && spw_locked) {
+			if (spw_opened && (spw_close () == 0)) {
+				fprintf (stderr,
+				         _("%s: failure while writing changes to %s\n"),
+				         Prog, spw_dbname ());
+				if (use_system_spw_file) {
+					SYSLOG ((LOG_ERR,
+					         "failure while writing changes to %s",
+					         spw_dbname ()));
+				}
+			} else {
+				spw_opened = false;
+			}
+			if (spw_unlock () == 0) {
+				fprintf (stderr,
+				         _("%s: failed to unlock %s\n"),
+				         Prog, spw_dbname ());
+				if (use_system_spw_file) {
+					SYSLOG ((LOG_ERR, "failed to unlock %s",
+					         spw_dbname ()));
+				}
+			} else {
+				spw_locked = false;
+			}
+		}
+#endif				/* WITH_TCB */
+	}
+}
+
+/*
+ * check_spw_file - check the content of the shadowed password file (shadow)
+ */
+static void check_spw_file (int *errors, bool *changed)
+{
+	struct commonio_entry *spe, *tspe;
+	struct spwd *spw;
+
+	/*
+	 * Loop through the entire shadow password file.
+	 */
+	for (spe = __spw_get_head (); NULL != spe; spe = spe->next) {
+		/*
+		 * Do not treat lines which were missing in shadow
+		 * and were added earlier.
+		 */
+		if (NULL == spe->line) {
+			continue;
+		}
+
+		/*
+		 * 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 (NULL == spe->eptr) {
+			/*
+			 * Tell the user this entire line is bogus and ask
+			 * them to delete it.
+			 */
+			puts (_("invalid shadow password file entry"));
+			printf (_("delete line '%s'? "), spe->line);
+			*errors += 1;
+
+			/*
+			 * prompt the user to delete the entry or not
+			 */
+			if (!yes_or_no (read_only)) {
+				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:
+			if (use_system_spw_file) {
+				SYSLOG ((LOG_INFO, "delete shadow line '%s'",
+				         spe->line));
+			}
+			*changed = true;
+
+			__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 (); NULL != 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 (NULL == 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.
+			 */
+			puts (_("duplicate shadow password entry"));
+			printf (_("delete line '%s'? "), spe->line);
+			*errors += 1;
+
+			/*
+			 * prompt the user to delete the entry or not
+			 */
+			if (yes_or_no (read_only)) {
+				goto delete_spw;
+			}
+		}
+
+		/*
+		 * Make sure this entry exists in the /etc/passwd
+		 * file.
+		 */
+		if (pw_locate (spw->sp_namp) == NULL) {
+			/*
+			 * Tell the user this entry has no matching
+			 * /etc/passwd entry and ask them to delete it.
+			 */
+			printf (_("no matching password file entry in %s\n"),
+			        pw_dbname ());
+			printf (_("delete line '%s'? "), spe->line);
+			*errors += 1;
+
+			/*
+			 * prompt the user to delete the entry or not
+			 */
+			if (yes_or_no (read_only)) {
+				goto delete_spw;
+			}
+		}
+
+		/*
+		 * Warn if last password change in the future.  --marekm
+		 */
+		if (!quiet) {
+			time_t t = time ((time_t *) 0);
+			if (   (t != 0)
+			    && (spw->sp_lstchg > (long) t / SCALE)) {
+				printf (_("user %s: last password change in the future\n"),
+			                spw->sp_namp);
+				*errors += 1;
+			}
+		}
+	}
+}
+
+/*
+ * pwck - verify password file integrity
+ */
+int main (int argc, char **argv)
+{
+	int errors = 0;
+	bool changed = false;
+
+	/*
+	 * Get my name so that I can use it to report errors.
+	 */
+	Prog = Basename (argv[0]);
+
+	(void) setlocale (LC_ALL, "");
+	(void) bindtextdomain (PACKAGE, LOCALEDIR);
+	(void) textdomain (PACKAGE);
+
+	process_root_flag ("-R", argc, argv);
+
+	OPENLOG ("pwck");
+
+	/* Parse the command line arguments */
+	process_flags (argc, argv);
+
+	open_files ();
+
+	if (sort_mode) {
+		if (pw_sort () != 0) {
+			fprintf (stderr,
+			         _("%s: cannot sort entries in %s\n"),
+			         Prog, pw_dbname ());
+			fail_exit (E_CANTSORT);
+		}
+		if (is_shadow) {
+			if (spw_sort () != 0) {
+				fprintf (stderr,
+				         _("%s: cannot sort entries in %s\n"),
+				         Prog, spw_dbname ());
+				fail_exit (E_CANTSORT);
+			}
+		}
+		changed = true;
+	} else {
+		check_pw_file (&errors, &changed);
+
+		if (is_shadow) {
+			check_spw_file (&errors, &changed);
+		}
+	}
+
+	close_files (changed);
+
+	nscd_flush_cache ("passwd");
+
+	/*
+	 * Tell the user what we did and exit.
+	 */
+	if (0 != errors) {
+		printf (changed ?
+		        _("%s: the files have been updated\n") :
+		        _("%s: no changes\n"), Prog);
+	}
+
+	closelog ();
+	return ((0 != errors) ? E_BADENTRY : E_OKAY);
+}
+