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+/*
+ * 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 <grp.h>
+#include <pwd.h>
+#ifdef ACCT_TOOLS_SETUID
+#ifdef USE_PAM
+#include "pam_defs.h"
+#endif /* USE_PAM */
+#endif /* ACCT_TOOLS_SETUID */
+#include <stdio.h>
+#include <sys/types.h>
+#include <getopt.h>
+#include "defines.h"
+#include "groupio.h"
+#include "nscd.h"
+#include "sssd.h"
+#include "prototypes.h"
+#ifdef SHADOWGRP
+#include "sgroupio.h"
+#endif
+/*
+ * Global variables
+ */
+const char *Prog;
+
+static char *group_name;
+static gid_t group_id = -1;
+static bool check_group_busy = true;
+
+static const char* prefix = "";
+
+#ifdef SHADOWGRP
+static bool is_shadow_grp;
+#endif
+
+/*
+ * exit status values
+ */
+/*@-exitarg@*/
+#define E_SUCCESS 0 /* success */
+#define E_USAGE 2 /* invalid command syntax */
+#define E_NOTFOUND 6 /* specified group doesn't exist */
+#define E_GROUP_BUSY 8 /* can't remove user's primary group */
+#define E_GRP_UPDATE 10 /* can't update group file */
+
+/* local function prototypes */
+static /*@noreturn@*/void usage (int status);
+static void grp_update (void);
+static void close_files (void);
+static void open_files (void);
+static void group_busy (gid_t gid);
+static void process_flags (int argc, char **argv);
+
+/*
+ * usage - display usage message and exit
+ */
+static /*@noreturn@*/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 (_(" -h, --help display this help message and exit\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 (_(" -f, --force delete group even if it is the primary group of a user\n"), usageout);
+ (void) fputs ("\n", usageout);
+ exit (status);
+}
+
+/*
+ * grp_update - update group file entries
+ *
+ * grp_update() writes the new records to the group files.
+ */
+static void grp_update (void)
+{
+ /*
+ * To add the group, we need to update /etc/group.
+ * Make sure failures will be reported.
+ */
+ add_cleanup (cleanup_report_del_group_group, group_name);
+#ifdef SHADOWGRP
+ if (is_shadow_grp) {
+ /* We also need to update /etc/gshadow */
+ add_cleanup (cleanup_report_del_group_gshadow, group_name);
+ }
+#endif
+
+ /*
+ * Delete the group entry.
+ */
+ if (gr_remove (group_name) == 0) {
+ fprintf (stderr,
+ _("%s: cannot remove entry '%s' from %s\n"),
+ Prog, group_name, gr_dbname ());
+ exit (E_GRP_UPDATE);
+ }
+
+#ifdef SHADOWGRP
+ /*
+ * Delete the shadow group entries as well.
+ */
+ if (is_shadow_grp && (sgr_locate (group_name) != NULL)) {
+ if (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 */
+}
+
+/*
+ * 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)
+{
+ /* First, write the changes in the regular group database */
+ 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_DEL_GROUP, Prog,
+ "removing group from /etc/group",
+ group_name, (unsigned int) group_id,
+ SHADOW_AUDIT_SUCCESS);
+#endif
+ SYSLOG ((LOG_INFO,
+ "group '%s' removed from %s",
+ group_name, gr_dbname ()));
+ del_cleanup (cleanup_report_del_group_group);
+
+ cleanup_unlock_group (NULL);
+ del_cleanup (cleanup_unlock_group);
+
+
+ /* Then, write the changes in the shadow database */
+#ifdef SHADOWGRP
+ if (is_shadow_grp) {
+ 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_DEL_GROUP, Prog,
+ "removing group from /etc/gshadow",
+ group_name, (unsigned int) group_id,
+ SHADOW_AUDIT_SUCCESS);
+#endif
+ SYSLOG ((LOG_INFO,
+ "group '%s' removed from %s",
+ group_name, sgr_dbname ()));
+ del_cleanup (cleanup_report_del_group_gshadow);
+
+ cleanup_unlock_gshadow (NULL);
+ del_cleanup (cleanup_unlock_gshadow);
+ }
+#endif /* SHADOWGRP */
+
+ /* Report success at the system level */
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_GROUP, Prog,
+ "",
+ group_name, (unsigned int) group_id,
+ SHADOW_AUDIT_SUCCESS);
+#endif
+ SYSLOG ((LOG_INFO, "group '%s' removed\n", group_name));
+ del_cleanup (cleanup_report_del_group);
+}
+
+/*
+ * open_files - lock and open the group files
+ *
+ * open_files() opens the two group files.
+ */
+static void open_files (void)
+{
+ /* First, lock the databases */
+ 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) {
+ 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
+
+ /*
+ * Now, if the group is not removed, it's our fault.
+ * Make sure failures will be reported.
+ */
+ add_cleanup (cleanup_report_del_group, group_name);
+
+ /* An now open the databases */
+ 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) {
+ 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 */
+}
+
+/*
+ * group_busy - check if this is any user's primary group
+ *
+ * group_busy verifies that this group is not the primary group
+ * for any user. You must remove all users before you remove
+ * the group.
+ */
+static void group_busy (gid_t gid)
+{
+ struct passwd *pwd;
+
+ /*
+ * Nice slow linear search.
+ */
+
+ prefix_setpwent ();
+
+ while ( ((pwd = prefix_getpwent ()) != NULL) && (pwd->pw_gid != gid) );
+
+ prefix_endpwent ();
+
+ /*
+ * If pwd isn't NULL, it stopped because the gid's matched.
+ */
+
+ if (pwd == (struct passwd *) 0) {
+ return;
+ }
+
+ /*
+ * Can't remove the group.
+ */
+ fprintf (stderr,
+ _("%s: cannot remove the primary group of user '%s'\n"),
+ Prog, pwd->pw_name);
+ exit (E_GROUP_BUSY);
+}
+
+/*
+ * process_flags - parse the command line options
+ *
+ * It will not return if an error is encountered.
+ */
+static void process_flags (int argc, char **argv)
+{
+ /*
+ * Parse the command line options.
+ */
+ int c;
+ static struct option long_options[] = {
+ {"help", no_argument, NULL, 'h'},
+ {"root", required_argument, NULL, 'R'},
+ {"prefix", required_argument, NULL, 'P'},
+ {NULL, 0, NULL, '\0'}
+ };
+
+ while ((c = getopt_long (argc, argv, "hfR:P:",
+ long_options, NULL)) != -1) {
+ switch (c) {
+ case 'h':
+ usage (E_SUCCESS);
+ /*@notreached@*/break;
+ case 'R': /* no-op, handled in process_root_flag () */
+ break;
+ case 'P': /* no-op, handled in process_prefix_flag () */
+ break;
+ case 'f':
+ check_group_busy = false;
+ break;
+ default:
+ usage (E_USAGE);
+ }
+ }
+
+ if (optind != argc - 1) {
+ usage (E_USAGE);
+ }
+ group_name = argv[optind];
+}
+
+/*
+ * main - groupdel command
+ *
+ * The syntax of the groupdel command is
+ *
+ * groupdel group
+ *
+ * The named group will be deleted.
+ */
+
+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 ("groupdel");
+#ifdef WITH_AUDIT
+ audit_help_open ();
+#endif
+
+ if (atexit (do_cleanups) != 0) {
+ fprintf (stderr,
+ _("%s: Cannot setup cleanup service.\n"),
+ Prog);
+ exit (1);
+ }
+
+ process_flags (argc, argv);
+
+#ifdef ACCT_TOOLS_SETUID
+#ifdef USE_PAM
+ {
+ struct passwd *pampw;
+ pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
+ if (pampw == NULL) {
+ fprintf (stderr,
+ _("%s: Cannot determine your user name.\n"),
+ Prog);
+ exit (1);
+ }
+
+ retval = pam_start ("groupdel", 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 (1);
+ }
+ (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);
+ }
+
+ group_id = grp->gr_gid;
+ }
+
+#ifdef USE_NIS
+ /*
+ * Make sure this isn't a 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
+
+ /*
+ * Make sure this isn't the primary group of anyone.
+ */
+ if (check_group_busy) {
+ group_busy (group_id);
+ }
+
+ /*
+ * Do the hard stuff - open the files, delete 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;
+}
+
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