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

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

1 files changed, 887 insertions, 0 deletions

diff --git a/src/grpck.c b/src/grpck.c
new file mode 100644
index 0000000..ea5d3b3
--- /dev/null
+++ b/src/grpck.c
@@ -0,0 +1,887 @@
+/*
+ * 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 "groupio.h"
+#include "nscd.h"
+#include "prototypes.h"
+
+#ifdef SHADOWGRP
+#include "sgroupio.h"
+#endif
+
+/*
+ * Exit codes
+ */
+/*@-exitarg@*/
+#define	E_OKAY		0
+#define	E_SUCCESS	0
+#define	E_USAGE		1
+#define	E_BAD_ENTRY	2
+#define	E_CANT_OPEN	3
+#define	E_CANT_LOCK	4
+#define	E_CANT_UPDATE	5
+
+/*
+ * Global variables
+ */
+const char *Prog;
+
+static const char *grp_file = GROUP_FILE;
+static bool use_system_grp_file = true;
+
+#ifdef	SHADOWGRP
+static const char *sgr_file = SGROUP_FILE;
+static bool use_system_sgr_file = true;
+static bool is_shadow = false;
+static bool sgr_locked = false;
+#endif
+static bool gr_locked = false;
+/* Options */
+static bool read_only = false;
+static bool sort_mode = false;
+
+/* local function prototypes */
+static void fail_exit (int status);
+static /*@noreturn@*/void usage (int status);
+static void delete_member (char **, const char *);
+static void process_flags (int argc, char **argv);
+static void open_files (void);
+static void close_files (bool changed);
+static int check_members (const char *groupname,
+                          char **members,
+                          const char *fmt_info,
+                          const char *fmt_prompt,
+                          const char *fmt_syslog,
+                          int *errors);
+static void check_grp_file (int *errors, bool *changed);
+#ifdef SHADOWGRP
+static void compare_members_lists (const char *groupname,
+                                   char **members,
+                                   char **other_members,
+                                   const char *file,
+                                   const char *other_file);
+static void check_sgr_file (int *errors, bool *changed);
+#endif
+
+/*
+ * fail_exit - exit with an error code after unlocking files
+ */
+static void fail_exit (int status)
+{
+	if (gr_locked) {
+		if (gr_unlock () == 0) {
+			fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, gr_dbname ());
+			SYSLOG ((LOG_ERR, "failed to unlock %s", gr_dbname ()));
+			/* continue */
+		}
+	}
+
+#ifdef	SHADOWGRP
+	if (sgr_locked) {
+		if (sgr_unlock () == 0) {
+			fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sgr_dbname ());
+			SYSLOG ((LOG_ERR, "failed to unlock %s", sgr_dbname ()));
+			/* continue */
+		}
+	}
+#endif
+
+	closelog ();
+
+	exit (status);
+}
+
+/*
+ * usage - print syntax message and exit
+ */
+static /*@noreturn@*/void usage (int status)
+{
+	FILE *usageout = (E_SUCCESS != status) ? stderr : stdout;
+#ifdef	SHADOWGRP
+	(void) fprintf (usageout,
+	                _("Usage: %s [options] [group [gshadow]]\n"
+	                  "\n"
+	                  "Options:\n"),
+	                Prog);
+#else				/* !SHADOWGRP */
+	(void) fprintf (usageout,
+	                _("Usage: %s [options] [group]\n"
+	                  "\n"
+	                  "Options:\n"),
+	                Prog);
+#endif				/* !SHADOWGRP */
+	(void) fputs (_("  -h, --help                    display this help message and exit\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);
+	(void) fputs (_("  -s, --sort                    sort entries by UID\n"), usageout);
+	(void) fputs ("\n", usageout);
+	exit (status);
+}
+
+/*
+ * delete_member - delete an entry in a list of members
+ *
+ * It only deletes the first entry with the given name.
+ * The member is defined by its address, no string comparison are
+ * performed.
+ */
+static void delete_member (char **list, const char *member)
+{
+	int i;
+
+	for (i = 0; NULL != list[i]; i++) {
+		if (list[i] == member) {
+			break;
+		}
+	}
+
+	for (; NULL != list[i]; i++) {
+		list[i] = list[i + 1];
+	}
+}
+
+/*
+ * 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, "hqrR:s",
+	                         long_options, NULL)) != -1) {
+		switch (c) {
+		case 'h':
+			usage (E_SUCCESS);
+			/*@notreached@*/break;
+		case 'q':
+			/* quiet - ignored for now */
+			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
+	 */
+#ifdef	SHADOWGRP
+	if (argc > (optind + 2))
+#else
+	if (argc > (optind + 1))
+#endif
+	{
+		usage (E_USAGE);
+	}
+
+	/*
+	 * If there are two left over filenames, use those as the group and
+	 * group password filenames.
+	 */
+	if (optind != argc) {
+		grp_file = argv[optind];
+		gr_setdbname (grp_file);
+		use_system_grp_file = false;
+	}
+#ifdef	SHADOWGRP
+	if ((optind + 2) == argc) {
+		sgr_file = argv[optind + 1];
+		sgr_setdbname (sgr_file);
+		is_shadow = true;
+		use_system_sgr_file = false;
+	} else if (optind == argc) {
+		is_shadow = sgr_file_present ();
+	}
+#endif
+}
+
+/*
+ * 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)
+{
+	/*
+	 * Lock the files if we aren't in "read-only" mode
+	 */
+	if (!read_only) {
+		if (gr_lock () == 0) {
+			fprintf (stderr,
+			         _("%s: cannot lock %s; try again later.\n"),
+			         Prog, grp_file);
+			fail_exit (E_CANT_LOCK);
+		}
+		gr_locked = true;
+#ifdef	SHADOWGRP
+		if (is_shadow) {
+			if (sgr_lock () == 0) {
+				fprintf (stderr,
+				         _("%s: cannot lock %s; try again later.\n"),
+				         Prog, sgr_file);
+				fail_exit (E_CANT_LOCK);
+			}
+			sgr_locked = true;
+		}
+#endif
+	}
+
+	/*
+	 * Open the files. Use O_RDONLY if we are in read_only mode,
+	 * O_RDWR otherwise.
+	 */
+	if (gr_open (read_only ? O_RDONLY : O_CREAT | O_RDWR) == 0) {
+		fprintf (stderr, _("%s: cannot open %s\n"), Prog,
+		         grp_file);
+		if (use_system_grp_file) {
+			SYSLOG ((LOG_WARN, "cannot open %s", grp_file));
+		}
+		fail_exit (E_CANT_OPEN);
+	}
+#ifdef	SHADOWGRP
+	if (is_shadow && (sgr_open (read_only ? O_RDONLY : O_CREAT | O_RDWR) == 0)) {
+		fprintf (stderr, _("%s: cannot open %s\n"), Prog,
+		         sgr_file);
+		if (use_system_sgr_file) {
+			SYSLOG ((LOG_WARN, "cannot open %s", sgr_file));
+		}
+		fail_exit (E_CANT_OPEN);
+	}
+#endif
+}
+
+/*
+ * close_files - close and unlock the group/gshadow 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 (gr_close () == 0) {
+			fprintf (stderr, _("%s: failure while writing changes to %s\n"),
+			         Prog, grp_file);
+			fail_exit (E_CANT_UPDATE);
+		}
+#ifdef	SHADOWGRP
+		if (is_shadow && (sgr_close () == 0)) {
+			fprintf (stderr, _("%s: failure while writing changes to %s\n"),
+			         Prog, sgr_file);
+			fail_exit (E_CANT_UPDATE);
+		}
+#endif
+	}
+
+	/*
+	 * Don't be anti-social - unlock the files when you're done.
+	 */
+#ifdef	SHADOWGRP
+	if (sgr_locked) {
+		if (sgr_unlock () == 0) {
+			fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sgr_dbname ());
+			SYSLOG ((LOG_ERR, "failed to unlock %s", sgr_dbname ()));
+			/* continue */
+		}
+		sgr_locked = false;
+	}
+#endif
+	if (gr_locked) {
+		if (gr_unlock () == 0) {
+			fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, gr_dbname ());
+			SYSLOG ((LOG_ERR, "failed to unlock %s", gr_dbname ()));
+			/* continue */
+		}
+		gr_locked = false;
+	}
+}
+
+/*
+ * check_members - check that every members of a group exist
+ *
+ *	If an error is detected, *errors is incremented.
+ *
+ *	The user will be prompted for the removal of the non-existent
+ *	user.
+ *
+ *	If any changes are performed, the return value will be 1,
+ *	otherwise check_members() returns 0.
+ *
+ *	fmt_info, fmt_prompt, and fmt_syslog are used for logging.
+ *	  * fmt_info must contain two string flags (%s): for the group's
+ *	    name and the missing member.
+ *	  * fmt_prompt must contain one string flags (%s): the missing
+ *	    member.
+ *	  * fmt_syslog must contain two string flags (%s): for the
+ *	    group's name and the missing member.
+ */
+static int check_members (const char *groupname,
+                          char **members,
+                          const char *fmt_info,
+                          const char *fmt_prompt,
+                          const char *fmt_syslog,
+                          int *errors)
+{
+	int i;
+	int members_changed = 0;
+
+	/*
+	 * Make sure each member exists
+	 */
+	for (i = 0; NULL != members[i]; i++) {
+		/* local, no need for xgetpwnam */
+		if (getpwnam (members[i]) != NULL) {
+			continue;
+		}
+		/*
+		 * Can't find this user. Remove them
+		 * from the list.
+		 */
+		*errors += 1;
+		printf (fmt_info, groupname, members[i]);
+		printf (fmt_prompt, members[i]);
+
+		if (!yes_or_no (read_only)) {
+			continue;
+		}
+
+		SYSLOG ((LOG_INFO, fmt_syslog, members[i], groupname));
+		members_changed = 1;
+		delete_member (members, members[i]);
+
+		/* Rewind in case of removal */
+		i--;
+	}
+
+	return members_changed;
+}
+
+#ifdef SHADOWGRP
+/*
+ * compare_members_lists - make sure the list of members is contained in
+ *                         another list.
+ *
+ *	compare_members_lists() checks that all the members of members are
+ *	also in other_members.
+ *	file and other_file are used for logging.
+ *
+ *	TODO: No changes are performed on the lists.
+ */
+static void compare_members_lists (const char *groupname,
+                                   char **members,
+                                   char **other_members,
+                                   const char *file,
+                                   const char *other_file)
+{
+	char **pmem, **other_pmem;
+
+	for (pmem = members; NULL != *pmem; pmem++) {
+		for (other_pmem = other_members; NULL != *other_pmem; other_pmem++) {
+			if (strcmp (*pmem, *other_pmem) == 0) {
+				break;
+			}
+		}
+		if (*other_pmem == NULL) {
+			printf
+			    ("'%s' is a member of the '%s' group in %s but not in %s\n",
+			     *pmem, groupname, file, other_file);
+		}
+	}
+}
+#endif				/* SHADOWGRP */
+
+/*
+ * check_grp_file - check the content of the group file
+ */
+static void check_grp_file (int *errors, bool *changed)
+{
+	struct commonio_entry *gre, *tgre;
+	struct group *grp;
+#ifdef SHADOWGRP
+	struct sgrp *sgr;
+#endif
+
+	/*
+	 * Loop through the entire group file.
+	 */
+	for (gre = __gr_get_head (); NULL != gre; gre = gre->next) {
+		/*
+		 * Skip all NIS entries.
+		 */
+
+		if ((gre->line[0] == '+') || (gre->line[0] == '-')) {
+			continue;
+		}
+
+		/*
+		 * Start with the entries that are completely corrupt. They
+		 * have no (struct group) entry because they couldn't be
+		 * parsed properly.
+		 */
+		if (NULL == gre->eptr) {
+
+			/*
+			 * Tell the user this entire line is bogus and ask
+			 * them to delete it.
+			 */
+			(void) puts (_("invalid group file entry"));
+			printf (_("delete line '%s'? "), gre->line);
+			*errors += 1;
+
+			/*
+			 * prompt the user to delete the entry or not
+			 */
+			if (!yes_or_no (read_only)) {
+				continue;
+			}
+
+			/*
+			 * All group 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_gr:
+			SYSLOG ((LOG_INFO, "delete group line '%s'",
+			         gre->line));
+			*changed = true;
+
+			__gr_del_entry (gre);
+			continue;
+		}
+
+		/*
+		 * Group structure is good, start using it.
+		 */
+		grp = gre->eptr;
+
+		/*
+		 * Make sure this entry has a unique name.
+		 */
+		for (tgre = __gr_get_head (); NULL != tgre; tgre = tgre->next) {
+
+			const struct group *ent = tgre->eptr;
+
+			/*
+			 * Don't check this entry
+			 */
+			if (tgre == gre) {
+				continue;
+			}
+
+			/*
+			 * Don't check invalid entries.
+			 */
+			if (NULL == ent) {
+				continue;
+			}
+
+			if (strcmp (grp->gr_name, ent->gr_name) != 0) {
+				continue;
+			}
+
+			/*
+			 * Tell the user this entry is a duplicate of
+			 * another and ask them to delete it.
+			 */
+			(void) puts (_("duplicate group entry"));
+			printf (_("delete line '%s'? "), gre->line);
+			*errors += 1;
+
+			/*
+			 * prompt the user to delete the entry or not
+			 */
+			if (yes_or_no (read_only)) {
+				goto delete_gr;
+			}
+		}
+
+		/*
+		 * Check for invalid group names.  --marekm
+		 */
+		if (!is_valid_group_name (grp->gr_name)) {
+			*errors += 1;
+			printf (_("invalid group name '%s'\n"), grp->gr_name);
+		}
+
+		/*
+		 * Check for invalid group ID.
+		 */
+		if (grp->gr_gid == (gid_t)-1) {
+			printf (_("invalid group ID '%lu'\n"), (long unsigned int)grp->gr_gid);
+			*errors += 1;
+		}
+
+		/*
+		 * Workaround for a NYS libc 5.3.12 bug on RedHat 4.2 -
+		 * groups with no members are returned as groups with one
+		 * member "", causing grpck to fail.  --marekm
+		 */
+		if (   (NULL != grp->gr_mem[0])
+		    && (NULL == grp->gr_mem[1])
+		    && ('\0' == grp->gr_mem[0][0])) {
+			grp->gr_mem[0] = NULL;
+		}
+
+		if (check_members (grp->gr_name, grp->gr_mem,
+		                   _("group %s: no user %s\n"),
+		                   _("delete member '%s'? "),
+		                   "delete member '%s' from group '%s'",
+		                   errors) == 1) {
+			*changed = true;
+			gre->changed = true;
+			__gr_set_changed ();
+		}
+
+#ifdef	SHADOWGRP
+		/*
+		 * Make sure this entry exists in the /etc/gshadow file.
+		 */
+
+		if (is_shadow) {
+			sgr = (struct sgrp *) sgr_locate (grp->gr_name);
+			if (sgr == NULL) {
+				printf (_("no matching group file entry in %s\n"),
+				        sgr_file);
+				printf (_("add group '%s' in %s? "),
+				        grp->gr_name, sgr_file);
+				*errors += 1;
+				if (yes_or_no (read_only)) {
+					struct sgrp sg;
+					struct group gr;
+					static char *empty = NULL;
+
+					sg.sg_name = grp->gr_name;
+					sg.sg_passwd = grp->gr_passwd;
+					sg.sg_adm = &empty;
+					sg.sg_mem = grp->gr_mem;
+					SYSLOG ((LOG_INFO,
+					         "add group '%s' to '%s'",
+					         grp->gr_name, sgr_file));
+					*changed = true;
+
+					if (sgr_update (&sg) == 0) {
+						fprintf (stderr,
+						         _("%s: failed to prepare the new %s entry '%s'\n"),
+						         Prog, sgr_dbname (), sg.sg_name);
+						fail_exit (E_CANT_UPDATE);
+					}
+					/* remove password from /etc/group */
+					gr = *grp;
+					gr.gr_passwd = SHADOW_PASSWD_STRING;	/* XXX warning: const */
+					if (gr_update (&gr) == 0) {
+						fprintf (stderr,
+						         _("%s: failed to prepare the new %s entry '%s'\n"),
+						         Prog, gr_dbname (), gr.gr_name);
+						fail_exit (E_CANT_UPDATE);
+					}
+				}
+			} else {
+				/**
+				 * Verify that all the members defined in /etc/group are also
+				 * present in /etc/gshadow.
+				 */
+				compare_members_lists (grp->gr_name,
+				                       grp->gr_mem, sgr->sg_mem,
+				                       grp_file, sgr_file);
+
+				/* The group entry has a gshadow counterpart.
+				 * Make sure no passwords are in group.
+				 */
+				if (strcmp (grp->gr_passwd, SHADOW_PASSWD_STRING) != 0) {
+					printf (_("group %s has an entry in %s, but its password field in %s is not set to 'x'\n"),
+					        grp->gr_name, sgr_file, grp_file);
+					*errors += 1;
+				}
+			}
+		}
+#endif
+
+	}
+}
+
+#ifdef SHADOWGRP
+/*
+ * check_sgr_file - check the content of the shadowed group file (gshadow)
+ */
+static void check_sgr_file (int *errors, bool *changed)
+{
+	struct group *grp;
+	struct commonio_entry *sge, *tsge;
+	struct sgrp *sgr;
+
+	/*
+	 * Loop through the entire shadow group file.
+	 */
+	for (sge = __sgr_get_head (); NULL != sge; sge = sge->next) {
+
+		/*
+		 * Start with the entries that are completely corrupt. They
+		 * have no (struct sgrp) entry because they couldn't be
+		 * parsed properly.
+		 */
+		if (NULL == sge->eptr) {
+
+			/*
+			 * Tell the user this entire line is bogus and ask
+			 * them to delete it.
+			 */
+			(void) puts (_("invalid shadow group file entry"));
+			printf (_("delete line '%s'? "), sge->line);
+			*errors += 1;
+
+			/*
+			 * prompt the user to delete the entry or not
+			 */
+			if (!yes_or_no (read_only)) {
+				continue;
+			}
+
+			/*
+			 * All shadow group 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_sg:
+			SYSLOG ((LOG_INFO, "delete shadow line '%s'",
+			         sge->line));
+			*changed = true;
+
+			__sgr_del_entry (sge);
+			continue;
+		}
+
+		/*
+		 * Shadow group structure is good, start using it.
+		 */
+		sgr = sge->eptr;
+
+		/*
+		 * Make sure this entry has a unique name.
+		 */
+		for (tsge = __sgr_get_head (); NULL != tsge; tsge = tsge->next) {
+
+			const struct sgrp *ent = tsge->eptr;
+
+			/*
+			 * Don't check this entry
+			 */
+			if (tsge == sge) {
+				continue;
+			}
+
+			/*
+			 * Don't check invalid entries.
+			 */
+			if (NULL == ent) {
+				continue;
+			}
+
+			if (strcmp (sgr->sg_name, ent->sg_name) != 0) {
+				continue;
+			}
+
+			/*
+			 * Tell the user this entry is a duplicate of
+			 * another and ask them to delete it.
+			 */
+			(void) puts (_("duplicate shadow group entry"));
+			printf (_("delete line '%s'? "), sge->line);
+			*errors += 1;
+
+			/*
+			 * prompt the user to delete the entry or not
+			 */
+			if (yes_or_no (read_only)) {
+				goto delete_sg;
+			}
+		}
+
+		/*
+		 * Make sure this entry exists in the /etc/group file.
+		 */
+		grp = (struct group *) gr_locate (sgr->sg_name);
+		if (grp == NULL) {
+			printf (_("no matching group file entry in %s\n"),
+			        grp_file);
+			printf (_("delete line '%s'? "), sge->line);
+			*errors += 1;
+			if (yes_or_no (read_only)) {
+				goto delete_sg;
+			}
+		} else {
+			/**
+			 * Verify that the all members defined in /etc/gshadow are also
+			 * present in /etc/group.
+			 */
+			compare_members_lists (sgr->sg_name,
+			                       sgr->sg_mem, grp->gr_mem,
+			                       sgr_file, grp_file);
+		}
+
+		/*
+		 * Make sure each administrator exists
+		 */
+		if (check_members (sgr->sg_name, sgr->sg_adm,
+		                   _("shadow group %s: no administrative user %s\n"),
+		                   _("delete administrative member '%s'? "),
+		                   "delete admin '%s' from shadow group '%s'",
+		                   errors) == 1) {
+			*changed = true;
+			sge->changed = true;
+			__sgr_set_changed ();
+		}
+
+		/*
+		 * Make sure each member exists
+		 */
+		if (check_members (sgr->sg_name, sgr->sg_mem,
+		                   _("shadow group %s: no user %s\n"),
+		                   _("delete member '%s'? "),
+		                   "delete member '%s' from shadow group '%s'",
+		                   errors) == 1) {
+			*changed = true;
+			sge->changed = true;
+			__sgr_set_changed ();
+		}
+	}
+}
+#endif				/* SHADOWGRP */
+
+/*
+ * grpck - verify group 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 ("grpck");
+
+	/* Parse the command line arguments */
+	process_flags (argc, argv);
+
+	open_files ();
+
+	if (sort_mode) {
+		gr_sort ();
+#ifdef	SHADOWGRP
+		if (is_shadow) {
+			sgr_sort ();
+		}
+		changed = true;
+#endif
+	} else {
+		check_grp_file (&errors, &changed);
+#ifdef	SHADOWGRP
+		if (is_shadow) {
+			check_sgr_file (&errors, &changed);
+		}
+#endif
+	}
+
+	/* Commit the change in the database if needed */
+	close_files (changed);
+
+	nscd_flush_cache ("group");
+
+	/*
+	 * Tell the user what we did and exit.
+	 */
+	if (0 != errors) {
+		if (changed) {
+			printf (_("%s: the files have been updated\n"), Prog);
+		} else {
+			printf (_("%s: no changes\n"), Prog);
+		}
+	}
+
+	return ((0 != errors) ? E_BAD_ENTRY : E_OKAY);
+}
+