Adding upstream version 1:4.8.1.upstream/1%4.8.1upstream

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

1 files changed, 885 insertions, 0 deletions

diff --git a/src/groupmod.c b/src/groupmod.c
new file mode 100644
index 0000000..1dca5fc
--- /dev/null
+++ b/src/groupmod.c
@@ -0,0 +1,885 @@
+/*
+ * Copyright (c) 1991 - 1994, Julianne Frances Haugh
+ * Copyright (c) 1996 - 2000, Marek Michałkiewicz
+ * Copyright (c) 2000 - 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 <ctype.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <grp.h>
+#include <stdio.h>
+#include <sys/types.h>
+#ifdef ACCT_TOOLS_SETUID
+#ifdef USE_PAM
+#include "pam_defs.h"
+#include <pwd.h>
+#endif				/* USE_PAM */
+#endif				/* ACCT_TOOLS_SETUID */
+#include "chkname.h"
+#include "defines.h"
+#include "groupio.h"
+#include "pwio.h"
+#include "nscd.h"
+#include "sssd.h"
+#include "prototypes.h"
+#ifdef	SHADOWGRP
+#include "sgroupio.h"
+#endif
+/*
+ * exit status values
+ */
+/*@-exitarg@*/
+#define E_SUCCESS	0	/* success */
+#define E_USAGE		2	/* invalid command syntax */
+#define E_BAD_ARG	3	/* invalid argument to option */
+#define E_GID_IN_USE	4	/* gid already in use (and no -o) */
+#define E_NOTFOUND	6	/* specified group doesn't exist */
+#define E_NAME_IN_USE	9	/* group name already in use */
+#define E_GRP_UPDATE	10	/* can't update group file */
+#define E_CLEANUP_SERVICE	11	/* can't setup cleanup service */
+#define E_PAM_USERNAME	12	/* can't determine your username for use with pam */
+#define E_PAM_ERROR	13	/* pam returned an error, see Syslog facility id groupmod */
+
+
+/*
+ * Global variables
+ */
+const char *Prog;
+
+#ifdef	SHADOWGRP
+static bool is_shadow_grp;
+#endif				/* SHADOWGRP */
+static char *group_name;
+static char *group_newname;
+static char *group_passwd;
+static gid_t group_id;
+static gid_t group_newid;
+
+static const char* prefix = "";
+
+static struct cleanup_info_mod info_passwd;
+static struct cleanup_info_mod info_group;
+#ifdef	SHADOWGRP
+static struct cleanup_info_mod info_gshadow;
+#endif
+
+static bool
+    oflg = false,		/* permit non-unique group ID to be specified with -g */
+    gflg = false,		/* new ID value for the group */
+    nflg = false,		/* a new name has been specified for the group */
+    pflg = false;		/* new encrypted password */
+
+/* local function prototypes */
+static void usage (int status);
+static void new_grent (struct group *);
+
+#ifdef SHADOWGRP
+static void new_sgent (struct sgrp *);
+#endif
+static void grp_update (void);
+static void check_new_gid (void);
+static void check_new_name (void);
+static void process_flags (int, char **);
+static void lock_files (void);
+static void prepare_failure_reports (void);
+static void open_files (void);
+static void close_files (void);
+static void update_primary_groups (gid_t ogid, gid_t ngid);
+
+/*
+ * usage - display usage message and exit
+ */
+
+static void usage (int status)
+{
+	FILE *usageout = (E_SUCCESS != status) ? stderr : stdout;
+	(void) fprintf (usageout,
+	                _("Usage: %s [options] GROUP\n"
+	                  "\n"
+	                  "Options:\n"),
+	                Prog);
+	(void) fputs (_("  -g, --gid GID                 change the group ID to GID\n"), usageout);
+	(void) fputs (_("  -h, --help                    display this help message and exit\n"), usageout);
+	(void) fputs (_("  -n, --new-name NEW_GROUP      change the name to NEW_GROUP\n"), usageout);
+	(void) fputs (_("  -o, --non-unique              allow to use a duplicate (non-unique) GID\n"), usageout);
+	(void) fputs (_("  -p, --password PASSWORD       change the password to this (encrypted)\n"
+	                "                                PASSWORD\n"), usageout);
+	(void) fputs (_("  -R, --root CHROOT_DIR         directory to chroot into\n"), usageout);
+	(void) fputs (_("  -P, --prefix PREFIX_DIR       prefix directory where are located the /etc/* files\n"), usageout);
+	(void) fputs ("\n", usageout);
+	exit (status);
+}
+
+/*
+ * new_grent - updates the values in a group file entry
+ *
+ *	new_grent() takes all of the values that have been entered and fills
+ *	in a (struct group) with them.
+ */
+static void new_grent (struct group *grent)
+{
+	if (nflg) {
+		grent->gr_name = xstrdup (group_newname);
+	}
+
+	if (gflg) {
+		grent->gr_gid = group_newid;
+	}
+
+	if (   pflg
+#ifdef SHADOWGRP
+	    && (   (!is_shadow_grp)
+	        || (strcmp (grent->gr_passwd, SHADOW_PASSWD_STRING) != 0))
+#endif
+		) {
+		/* Update the password in group if there is no gshadow
+		 * file or if the password is currently in group
+		 * (gr_passwd != "x").  We do not force the usage of
+		 * shadow passwords if it was not the case before.
+		 */
+		grent->gr_passwd = group_passwd;
+	}
+}
+
+#ifdef	SHADOWGRP
+/*
+ * new_sgent - updates the values in a shadow group file entry
+ *
+ *	new_sgent() takes all of the values that have been entered and fills
+ *	in a (struct sgrp) with them.
+ */
+static void new_sgent (struct sgrp *sgent)
+{
+	if (nflg) {
+		sgent->sg_name = xstrdup (group_newname);
+	}
+
+	/* Always update the shadowed password if there is a shadow entry
+	 * (even if shadowed passwords might not be enabled for this group
+	 * (gr_passwd != "x")).
+	 * It seems better to update the password in both places in case a
+	 * shadow and a non shadow entry exist.
+	 * This might occur only if there were already both entries.
+	 */
+	if (pflg) {
+		sgent->sg_passwd = group_passwd;
+	}
+}
+#endif				/* SHADOWGRP */
+
+/*
+ * grp_update - update group file entries
+ *
+ *	grp_update() updates the new records in the memory databases.
+ */
+static void grp_update (void)
+{
+	struct group grp;
+	const struct group *ogrp;
+
+#ifdef	SHADOWGRP
+	struct sgrp sgrp;
+	const struct sgrp *osgrp = NULL;
+#endif				/* SHADOWGRP */
+
+	/*
+	 * Get the current settings for this group.
+	 */
+	ogrp = gr_locate (group_name);
+	if (NULL == ogrp) {
+		fprintf (stderr,
+		         _("%s: group '%s' does not exist in %s\n"),
+		         Prog, group_name, gr_dbname ());
+		exit (E_GRP_UPDATE);
+	}
+	grp = *ogrp;
+	new_grent (&grp);
+#ifdef	SHADOWGRP
+	if (   is_shadow_grp
+	    && (pflg || nflg)) {
+		osgrp = sgr_locate (group_name);
+		if (NULL != osgrp) {
+			sgrp = *osgrp;
+			new_sgent (&sgrp);
+		} else if (   pflg
+		           && (strcmp (grp.gr_passwd, SHADOW_PASSWD_STRING) == 0)) {
+			static char *empty = NULL;
+			/* If there is a gshadow file with no entries for
+			 * the group, but the group file indicates a
+			 * shadowed password, we force the creation of a
+			 * gshadow entry when a new password is requested.
+			 */
+			memset (&sgrp, 0, sizeof sgrp);
+			sgrp.sg_name   = xstrdup (grp.gr_name);
+			sgrp.sg_passwd = xstrdup (grp.gr_passwd);
+			sgrp.sg_adm    = &empty;
+			sgrp.sg_mem    = dup_list (grp.gr_mem);
+			new_sgent (&sgrp);
+			osgrp = &sgrp; /* entry needs to be committed */
+		}
+	}
+#endif				/* SHADOWGRP */
+
+	if (gflg) {
+		update_primary_groups (ogrp->gr_gid, group_newid);
+	}
+
+	/*
+	 * Write out the new group file entry.
+	 */
+	if (gr_update (&grp) == 0) {
+		fprintf (stderr,
+		         _("%s: failed to prepare the new %s entry '%s'\n"),
+		         Prog, gr_dbname (), grp.gr_name);
+		exit (E_GRP_UPDATE);
+	}
+	if (nflg && (gr_remove (group_name) == 0)) {
+		fprintf (stderr,
+		         _("%s: cannot remove entry '%s' from %s\n"),
+		         Prog, grp.gr_name, gr_dbname ());
+		exit (E_GRP_UPDATE);
+	}
+
+#ifdef	SHADOWGRP
+	/*
+	 * Make sure there was a shadow entry to begin with.
+	 */
+	if (NULL != osgrp) {
+		/*
+		 * Write out the new shadow group entries as well.
+		 */
+		if (sgr_update (&sgrp) == 0) {
+			fprintf (stderr,
+			         _("%s: failed to prepare the new %s entry '%s'\n"),
+			         Prog, sgr_dbname (), sgrp.sg_name);
+			exit (E_GRP_UPDATE);
+		}
+		if (nflg && (sgr_remove (group_name) == 0)) {
+			fprintf (stderr,
+			         _("%s: cannot remove entry '%s' from %s\n"),
+			         Prog, group_name, sgr_dbname ());
+			exit (E_GRP_UPDATE);
+		}
+	}
+#endif				/* SHADOWGRP */
+}
+
+/*
+ * check_new_gid - check the new GID value for uniqueness
+ *
+ *	check_new_gid() insures that the new GID value is unique.
+ */
+static void check_new_gid (void)
+{
+	/*
+	 * First, the easy stuff. If the ID can be duplicated, or if the ID
+	 * didn't really change, just return. If the ID didn't change, turn
+	 * off those flags. No sense doing needless work.
+	 */
+	if (group_id == group_newid) {
+		gflg = 0;
+		return;
+	}
+
+	if (oflg ||
+	    (getgrgid (group_newid) == NULL) /* local, no need for xgetgrgid */
+	   ) {
+		return;
+	}
+
+	/*
+	 * Tell the user what they did wrong.
+	 */
+	fprintf (stderr,
+	         _("%s: GID '%lu' already exists\n"),
+	         Prog, (unsigned long int) group_newid);
+	exit (E_GID_IN_USE);
+}
+
+/*
+ * check_new_name - check the new name for uniqueness
+ *
+ *	check_new_name() insures that the new name does not exist already.
+ *	You can't have the same name twice, period.
+ */
+static void check_new_name (void)
+{
+	/*
+	 * Make sure they are actually changing the name.
+	 */
+	if (strcmp (group_name, group_newname) == 0) {
+		nflg = 0;
+		return;
+	}
+
+	if (is_valid_group_name (group_newname)) {
+
+		/*
+		 * If the entry is found, too bad.
+		 */
+		/* local, no need for xgetgrnam */
+		if (prefix_getgrnam (group_newname) != NULL) {
+			fprintf (stderr,
+			         _("%s: group '%s' already exists\n"),
+			         Prog, group_newname);
+			exit (E_NAME_IN_USE);
+		}
+		return;
+	}
+
+	/*
+	 * All invalid group names land here.
+	 */
+
+	fprintf (stderr,
+	         _("%s: invalid group name '%s'\n"),
+	         Prog, group_newname);
+	exit (E_BAD_ARG);
+}
+
+/*
+ * process_flags - perform command line argument setting
+ *
+ *	process_flags() interprets the command line arguments and sets the
+ *	values that the user will be created with accordingly. The values
+ *	are checked for sanity.
+ */
+static void process_flags (int argc, char **argv)
+{
+	int c;
+	static struct option long_options[] = {
+		{"gid",        required_argument, NULL, 'g'},
+		{"help",       no_argument,       NULL, 'h'},
+		{"new-name",   required_argument, NULL, 'n'},
+		{"non-unique", no_argument,       NULL, 'o'},
+		{"password",   required_argument, NULL, 'p'},
+		{"root",       required_argument, NULL, 'R'},
+		{"prefix",     required_argument, NULL, 'P'},
+		{NULL, 0, NULL, '\0'}
+	};
+	while ((c = getopt_long (argc, argv, "g:hn:op:R:P:",
+		                 long_options, NULL)) != -1) {
+		switch (c) {
+		case 'g':
+			gflg = true;
+			if (   (get_gid (optarg, &group_newid) == 0)
+			    || (group_newid == (gid_t)-1)) {
+				fprintf (stderr,
+				         _("%s: invalid group ID '%s'\n"),
+				         Prog, optarg);
+				exit (E_BAD_ARG);
+			}
+			break;
+		case 'h':
+			usage (E_SUCCESS);
+			break;
+		case 'n':
+			nflg = true;
+			group_newname = optarg;
+			break;
+		case 'o':
+			oflg = true;
+			break;
+		case 'p':
+			group_passwd = optarg;
+			pflg = true;
+			break;
+		case 'R': /* no-op, handled in process_root_flag () */
+			break;
+		case 'P': /* no-op, handled in process_prefix_flag () */
+			break;
+		default:
+			usage (E_USAGE);
+		}
+	}
+
+	if (oflg && !gflg) {
+		usage (E_USAGE);
+	}
+
+	if (optind != (argc - 1)) {
+		usage (E_USAGE);
+	}
+
+	group_name = argv[argc - 1];
+}
+
+/*
+ * close_files - close all of the files that were opened
+ *
+ *	close_files() closes all of the files that were opened for this new
+ *	group. This causes any modified entries to be written out.
+ */
+static void close_files (void)
+{
+	if (gr_close () == 0) {
+		fprintf (stderr,
+		         _("%s: failure while writing changes to %s\n"),
+		         Prog, gr_dbname ());
+		exit (E_GRP_UPDATE);
+	}
+#ifdef WITH_AUDIT
+	audit_logger (AUDIT_USER_ACCT, Prog,
+	              info_group.audit_msg,
+	              group_name, AUDIT_NO_ID,
+	              SHADOW_AUDIT_SUCCESS);
+#endif
+	SYSLOG ((LOG_INFO,
+	         "group changed in %s (%s)",
+	         gr_dbname (), info_group.action));
+	del_cleanup (cleanup_report_mod_group);
+
+	cleanup_unlock_group (NULL);
+	del_cleanup (cleanup_unlock_group);
+
+#ifdef	SHADOWGRP
+	if (   is_shadow_grp
+	    && (pflg || nflg)) {
+		if (sgr_close () == 0) {
+			fprintf (stderr,
+			         _("%s: failure while writing changes to %s\n"),
+			         Prog, sgr_dbname ());
+			exit (E_GRP_UPDATE);
+		}
+#ifdef WITH_AUDIT
+		audit_logger (AUDIT_USER_ACCT, Prog,
+		              info_gshadow.audit_msg,
+		              group_name, AUDIT_NO_ID,
+		              SHADOW_AUDIT_SUCCESS);
+#endif
+		SYSLOG ((LOG_INFO,
+		         "group changed in %s (%s)",
+		         sgr_dbname (), info_gshadow.action));
+		del_cleanup (cleanup_report_mod_gshadow);
+
+		cleanup_unlock_gshadow (NULL);
+		del_cleanup (cleanup_unlock_gshadow);
+	}
+#endif				/* SHADOWGRP */
+
+	if (gflg) {
+		if (pw_close () == 0) {
+			fprintf (stderr,
+			         _("%s: failure while writing changes to %s\n"),
+			         Prog, pw_dbname ());
+			exit (E_GRP_UPDATE);
+		}
+#ifdef WITH_AUDIT
+		audit_logger (AUDIT_USER_ACCT, Prog,
+		              info_passwd.audit_msg,
+		              group_name, AUDIT_NO_ID,
+		              SHADOW_AUDIT_SUCCESS);
+#endif
+		SYSLOG ((LOG_INFO,
+		         "group changed in %s (%s)",
+		         pw_dbname (), info_passwd.action));
+		del_cleanup (cleanup_report_mod_passwd);
+
+		cleanup_unlock_passwd (NULL);
+		del_cleanup (cleanup_unlock_passwd);
+	}
+
+#ifdef WITH_AUDIT
+	audit_logger (AUDIT_USER_ACCT, Prog,
+	              "modifying group",
+	              group_name, AUDIT_NO_ID,
+	              SHADOW_AUDIT_SUCCESS);
+#endif
+}
+
+/*
+ * prepare_failure_reports - Prepare the cleanup_info structure for logging
+ * of success and failure to syslog or audit.
+ */
+static void prepare_failure_reports (void)
+{
+	info_group.name   = group_name;
+#ifdef	SHADOWGRP
+	info_gshadow.name = group_name;
+#endif
+	info_passwd.name  = group_name;
+
+	info_group.audit_msg   = xmalloc (512);
+#ifdef	SHADOWGRP
+	info_gshadow.audit_msg = xmalloc (512);
+#endif
+	info_passwd.audit_msg  = xmalloc (512);
+
+	(void) snprintf (info_group.audit_msg, 511,
+	                 "changing %s; ", gr_dbname ());
+#ifdef	SHADOWGRP
+	(void) snprintf (info_gshadow.audit_msg, 511,
+	                 "changing %s; ", sgr_dbname ());
+#endif
+	(void) snprintf (info_passwd.audit_msg, 511,
+	                 "changing %s; ", pw_dbname ());
+
+	info_group.action   =   info_group.audit_msg
+	                      + strlen (info_group.audit_msg);
+#ifdef	SHADOWGRP
+	info_gshadow.action =   info_gshadow.audit_msg
+	                      + strlen (info_gshadow.audit_msg);
+#endif
+	info_passwd.action  =   info_passwd.audit_msg
+	                      + strlen (info_passwd.audit_msg);
+
+	(void) snprintf (info_group.action,
+	                 511 - strlen (info_group.audit_msg),
+	                 "group %s/%lu",
+	                 group_name, (unsigned long int) group_id);
+#ifdef	SHADOWGRP
+	(void) snprintf (info_gshadow.action,
+	                 511 - strlen (info_group.audit_msg),
+	                 "group %s", group_name);
+#endif
+	(void) snprintf (info_passwd.action,
+	                 511 - strlen (info_group.audit_msg),
+	                 "group %s/%lu",
+	                 group_name, (unsigned long int) group_id);
+
+	if (nflg) {
+		strncat (info_group.action, ", new name: ",
+		         511 - strlen (info_group.audit_msg));
+		strncat (info_group.action, group_newname,
+		         511 - strlen (info_group.audit_msg));
+
+#ifdef	SHADOWGRP
+		strncat (info_gshadow.action, ", new name: ",
+		         511 - strlen (info_gshadow.audit_msg));
+		strncat (info_gshadow.action, group_newname,
+		         511 - strlen (info_gshadow.audit_msg));
+#endif
+
+		strncat (info_passwd.action, ", new name: ",
+		         511 - strlen (info_passwd.audit_msg));
+		strncat (info_passwd.action, group_newname,
+		         511 - strlen (info_passwd.audit_msg));
+	}
+	if (pflg) {
+		strncat (info_group.action, ", new password",
+		         511 - strlen (info_group.audit_msg));
+
+#ifdef	SHADOWGRP
+		strncat (info_gshadow.action, ", new password",
+		         511 - strlen (info_gshadow.audit_msg));
+#endif
+	}
+	if (gflg) {
+		strncat (info_group.action, ", new gid: ",
+		         511 - strlen (info_group.audit_msg));
+		(void) snprintf (info_group.action+strlen (info_group.action),
+		                 511 - strlen (info_group.audit_msg),
+		                 "%lu", (unsigned long int) group_newid);
+
+		strncat (info_passwd.action, ", new gid: ",
+		         511 - strlen (info_passwd.audit_msg));
+		(void) snprintf (info_passwd.action+strlen (info_passwd.action),
+		                 511 - strlen (info_passwd.audit_msg),
+		                 "%lu", (unsigned long int) group_newid);
+	}
+	info_group.audit_msg[511]   = '\0';
+#ifdef	SHADOWGRP
+	info_gshadow.audit_msg[511] = '\0';
+#endif
+	info_passwd.audit_msg[511]  = '\0';
+
+// FIXME: add a system cleanup
+	add_cleanup (cleanup_report_mod_group, &info_group);
+#ifdef	SHADOWGRP
+	if (   is_shadow_grp
+	    && (pflg || nflg)) {
+		add_cleanup (cleanup_report_mod_gshadow, &info_gshadow);
+	}
+#endif
+	if (gflg) {
+		add_cleanup (cleanup_report_mod_passwd, &info_passwd);
+	}
+
+}
+
+/*
+ * lock_files - lock the accounts databases
+ *
+ *	lock_files() locks the group, gshadow, and passwd databases.
+ */
+static void lock_files (void)
+{
+	if (gr_lock () == 0) {
+		fprintf (stderr,
+		         _("%s: cannot lock %s; try again later.\n"),
+		         Prog, gr_dbname ());
+		exit (E_GRP_UPDATE);
+	}
+	add_cleanup (cleanup_unlock_group, NULL);
+
+#ifdef	SHADOWGRP
+	if (   is_shadow_grp
+	    && (pflg || nflg)) {
+		if (sgr_lock () == 0) {
+			fprintf (stderr,
+			         _("%s: cannot lock %s; try again later.\n"),
+			         Prog, sgr_dbname ());
+			exit (E_GRP_UPDATE);
+		}
+		add_cleanup (cleanup_unlock_gshadow, NULL);
+	}
+#endif
+
+	if (gflg) {
+		if (pw_lock () == 0) {
+			fprintf (stderr,
+			         _("%s: cannot lock %s; try again later.\n"),
+			         Prog, pw_dbname ());
+			exit (E_GRP_UPDATE);
+		}
+		add_cleanup (cleanup_unlock_passwd, NULL);
+	}
+}
+
+
+/*
+ * open_files - open the accounts databases
+ *
+ *	open_files() opens the group, gshadow, and passwd databases.
+ */
+static void open_files (void)
+{
+	if (gr_open (O_CREAT | O_RDWR) == 0) {
+		fprintf (stderr, _("%s: cannot open %s\n"), Prog, gr_dbname ());
+		SYSLOG ((LOG_WARN, "cannot open %s", gr_dbname ()));
+		exit (E_GRP_UPDATE);
+	}
+
+#ifdef	SHADOWGRP
+	if (   is_shadow_grp
+	    && (pflg || nflg)) {
+		if (sgr_open (O_CREAT | O_RDWR) == 0) {
+			fprintf (stderr,
+			         _("%s: cannot open %s\n"),
+			         Prog, sgr_dbname ());
+			SYSLOG ((LOG_WARN, "cannot open %s", sgr_dbname ()));
+			exit (E_GRP_UPDATE);
+		}
+	}
+#endif				/* SHADOWGRP */
+
+	if (gflg) {
+		if (pw_open (O_CREAT | O_RDWR) == 0) {
+			fprintf (stderr,
+			         _("%s: cannot open %s\n"),
+			         Prog, pw_dbname ());
+			SYSLOG ((LOG_WARN, "cannot open %s", gr_dbname ()));
+			exit (E_GRP_UPDATE);
+		}
+	}
+}
+
+void update_primary_groups (gid_t ogid, gid_t ngid)
+{
+	struct passwd *pwd;
+
+	prefix_setpwent ();
+	while ((pwd = prefix_getpwent ()) != NULL) {
+		if (pwd->pw_gid == ogid) {
+			const struct passwd *lpwd;
+			struct passwd npwd;
+			lpwd = pw_locate (pwd->pw_name);
+			if (NULL == lpwd) {
+				fprintf (stderr,
+				         _("%s: user '%s' does not exist in %s\n"),
+				         Prog, pwd->pw_name, pw_dbname ());
+				exit (E_GRP_UPDATE);
+			} else {
+				npwd = *lpwd;
+				npwd.pw_gid = ngid;
+				if (pw_update (&npwd) == 0) {
+					fprintf (stderr,
+					         _("%s: failed to prepare the new %s entry '%s'\n"),
+					         Prog, pw_dbname (), npwd.pw_name);
+					exit (E_GRP_UPDATE);
+				}
+			}
+		}
+	}
+	prefix_endpwent ();
+}
+
+/*
+ * main - groupmod command
+ *
+ */
+int main (int argc, char **argv)
+{
+#ifdef ACCT_TOOLS_SETUID
+#ifdef USE_PAM
+	pam_handle_t *pamh = NULL;
+	int retval;
+#endif				/* USE_PAM */
+#endif				/* ACCT_TOOLS_SETUID */
+
+	/*
+	 * 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);
+	prefix = process_prefix_flag ("-P", argc, argv);
+
+	OPENLOG ("groupmod");
+#ifdef WITH_AUDIT
+	audit_help_open ();
+#endif
+
+	if (atexit (do_cleanups) != 0) {
+		fprintf (stderr,
+		         _("%s: Cannot setup cleanup service.\n"),
+		         Prog);
+		exit (E_CLEANUP_SERVICE);
+	}
+
+	process_flags (argc, argv);
+
+#ifdef ACCT_TOOLS_SETUID
+#ifdef USE_PAM
+	{
+		struct passwd *pampw;
+		pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
+		if (NULL == pampw) {
+			fprintf (stderr,
+			         _("%s: Cannot determine your user name.\n"),
+			         Prog);
+			exit (E_PAM_USERNAME);
+		}
+
+		retval = pam_start ("groupmod", pampw->pw_name, &conv, &pamh);
+	}
+
+	if (PAM_SUCCESS == retval) {
+		retval = pam_authenticate (pamh, 0);
+	}
+
+	if (PAM_SUCCESS == retval) {
+		retval = pam_acct_mgmt (pamh, 0);
+	}
+
+	if (PAM_SUCCESS != retval) {
+		fprintf (stderr, _("%s: PAM: %s\n"),
+		         Prog, pam_strerror (pamh, retval));
+		SYSLOG((LOG_ERR, "%s", pam_strerror (pamh, retval)));
+		if (NULL != pamh) {
+			(void) pam_end (pamh, retval);
+		}
+		exit (E_PAM_ERROR);
+	}
+	(void) pam_end (pamh, retval);
+#endif				/* USE_PAM */
+#endif				/* ACCT_TOOLS_SETUID */
+
+#ifdef SHADOWGRP
+	is_shadow_grp = sgr_file_present ();
+#endif
+	{
+		struct group *grp;
+		/*
+		 * Start with a quick check to see if the group exists.
+		 */
+		grp = prefix_getgrnam (group_name); /* local, no need for xgetgrnam */
+		if (NULL == grp) {
+			fprintf (stderr,
+			         _("%s: group '%s' does not exist\n"),
+			         Prog, group_name);
+			exit (E_NOTFOUND);
+		} else {
+			group_id = grp->gr_gid;
+		}
+	}
+
+#ifdef	USE_NIS
+	/*
+	 * Now make sure it isn't an NIS group.
+	 */
+	if (__isgrNIS ()) {
+		char *nis_domain;
+		char *nis_master;
+
+		fprintf (stderr,
+		         _("%s: group %s is a NIS group\n"),
+		         Prog, group_name);
+
+		if (!yp_get_default_domain (&nis_domain) &&
+		    !yp_master (nis_domain, "group.byname", &nis_master)) {
+			fprintf (stderr,
+			         _("%s: %s is the NIS master\n"),
+			         Prog, nis_master);
+		}
+		exit (E_NOTFOUND);
+	}
+#endif
+
+	if (gflg) {
+		check_new_gid ();
+	}
+
+	if (nflg) {
+		check_new_name ();
+	}
+
+	lock_files ();
+
+	/*
+	 * Now if the group is not changed, it's our fault.
+	 * Make sure failures will be reported.
+	 */
+	prepare_failure_reports ();
+
+	/*
+	 * Do the hard stuff - open the files, create the group entries,
+	 * then close and update the files.
+	 */
+	open_files ();
+
+	grp_update ();
+
+	close_files ();
+
+	nscd_flush_cache ("group");
+	sssd_flush_cache (SSSD_DB_GROUP);
+
+	return E_SUCCESS;
+}
+