/*
 * SPDX-FileCopyrightText: 1996       , Michael Meskes
 * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
 * SPDX-FileCopyrightText: 2002 - 2006, Tomasz Kłoczko
 * SPDX-FileCopyrightText: 2008 - 2011, Nicolas François
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

/*
 * grpunconv - update /etc/group with information from /etc/gshadow.
 *
 */

#include "config.h"

#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <time.h>
#include <unistd.h>
#include <grp.h>
#include <getopt.h>

#include "attr.h"
/*@-exitarg@*/
#include "exitcodes.h"
#include "io/fprintf.h"
#include "nscd.h"
#include "prototypes.h"
#include "sssd.h"
#include "string/strcmp/streq.h"

#ifdef SHADOWGRP
#include "groupio.h"
#include "sgroupio.h"
#include "shadow/gshadow/gshadow.h"
#include "shadow/gshadow/sgrp.h"
#include "shadowlog.h"

/*
 * Structures
 */
struct option_flags {
	bool chroot;
};

/*
 * Global variables
 */
static const char Prog[] = "grpunconv";

static bool gr_locked  = false;
static bool sgr_locked = false;

/* local function prototypes */
static void fail_exit (int status, bool process_selinux);
static void usage (int status);
static void process_flags (int argc, char **argv, struct option_flags *flags);

static void fail_exit (int status, bool process_selinux)
{
	if (gr_locked) {
		if (gr_unlock (process_selinux) == 0) {
			eprintf(_("%s: failed to unlock %s\n"), Prog, gr_dbname());
			SYSLOG(LOG_ERR, "failed to unlock %s", gr_dbname());
			/* continue */
		}
	}

	if (sgr_locked) {
		if (sgr_unlock (process_selinux) == 0) {
			eprintf(_("%s: failed to unlock %s\n"), Prog, sgr_dbname());
			SYSLOG(LOG_ERR, "failed to unlock %s", sgr_dbname());
			/* continue */
		}
	}

	exit (status);
}

static void usage (int status)
{
	FILE *usageout = (E_SUCCESS != status) ? stderr : stdout;
	(void) fprintf (usageout,
	                _("Usage: %s [options]\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 ("\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, struct option_flags *flags)
{
	/*
	 * Parse the command line options.
	 */
	int c;
	static struct option long_options[] = {
		{"help", no_argument,       NULL, 'h'},
		{"root", required_argument, NULL, 'R'},
		{NULL, 0, NULL, '\0'}
	};

	while ((c = getopt_long (argc, argv, "hR:",
	                         long_options, NULL)) != -1) {
		switch (c) {
		case 'h':
			usage (E_SUCCESS);
			/*@notreached@*/break;
		case 'R': /* no-op, handled in process_root_flag () */
			flags->chroot = true;
			break;
		default:
			usage (E_USAGE);
		}
	}

	if (optind != argc) {
		usage (E_USAGE);
	}
}

int main (int argc, char **argv)
{
	const struct group *gr;
	struct group grent;
	const struct sgrp *sg;
	struct option_flags  flags = {.chroot = false};
	bool process_selinux;

	log_set_progname(Prog);
	log_set_logfd(stderr);

	(void) setlocale (LC_ALL, "");
	(void) bindtextdomain (PACKAGE, LOCALEDIR);
	(void) textdomain (PACKAGE);

	process_root_flag ("-R", argc, argv);

	OPENLOG (Prog);

	process_flags (argc, argv, &flags);
	process_selinux = !flags.chroot;

	if (sgr_file_present () == 0) {
		exit (0);	/* no /etc/gshadow, nothing to do */
	}

	if (gr_lock () == 0) {
		eprintf(_("%s: cannot lock %s; try again later.\n"),
		         Prog, gr_dbname ());
		fail_exit (5, process_selinux);
	}
	gr_locked = true;
	if (gr_open (O_CREAT | O_RDWR) == 0) {
		eprintf(_("%s: cannot open %s\n"), Prog, gr_dbname());
		fail_exit (1, process_selinux);
	}

	if (sgr_lock () == 0) {
		eprintf(_("%s: cannot lock %s; try again later.\n"),
		         Prog, sgr_dbname ());
		fail_exit (5, process_selinux);
	}
	sgr_locked = true;
	if (sgr_open (O_RDONLY) == 0) {
		eprintf(_("%s: cannot open %s\n"), Prog, sgr_dbname());
		fail_exit (1, process_selinux);
	}

	/*
	 * Update group passwords if non-shadow password is "x".
	 */
	(void) gr_rewind ();
	while (NULL != (gr = gr_next())) {
		sg = sgr_locate (gr->gr_name);
		if (   (NULL != sg)
		    && streq(gr->gr_passwd, SHADOW_PASSWD_STRING)) {
			/* add password to /etc/group */
			grent = *gr;
			grent.gr_passwd = sg->sg_passwd;
			if (gr_update (&grent) == 0) {
				eprintf(_("%s: failed to prepare the new %s entry '%s'\n"),
				         Prog, gr_dbname (), grent.gr_name);
				fail_exit (3, process_selinux);
			}
		}
	}

	(void) sgr_close (process_selinux); /* was only open O_RDONLY */

	if (gr_close (process_selinux) == 0) {
		eprintf(_("%s: failure while writing changes to %s\n"),
		         Prog, gr_dbname ());
		SYSLOG(LOG_ERR, "failure while writing changes to %s", gr_dbname());
		fail_exit (3, process_selinux);
	}

	if (unlink(_PATH_GSHADOW) != 0) {
		eprintf(_("%s: cannot delete %s\n"), Prog, _PATH_GSHADOW);
		SYSLOG(LOG_ERR, "cannot delete %s", _PATH_GSHADOW);
		fail_exit (3, process_selinux);
	}

	if (gr_unlock (process_selinux) == 0) {
		eprintf(_("%s: failed to unlock %s\n"), Prog, gr_dbname());
		SYSLOG(LOG_ERR, "failed to unlock %s", gr_dbname());
		/* continue */
	}

	if (sgr_unlock (process_selinux) == 0) {
		eprintf(_("%s: failed to unlock %s\n"), Prog, sgr_dbname());
		SYSLOG(LOG_ERR, "failed to unlock %s", sgr_dbname());
		/* continue */
	}

	nscd_flush_cache ("group");
	sssd_flush_cache (SSSD_DB_GROUP);

	return 0;
}
#else				/* !SHADOWGRP */
int
main(MAYBE_UNUSED int _1, char **argv)
{
	eprintf("%s: not configured for shadow group support.\n", argv[0]);
	exit (1);
}
#endif				/* !SHADOWGRP */

