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shadow/src/groupdel.c

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/*
* SPDX-FileCopyrightText: 1991 - 1994, Julianne Frances Haugh
* SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
* SPDX-FileCopyrightText: 2000 - 2006, Tomasz Kłoczko
* SPDX-FileCopyrightText: 2007 - 2011, Nicolas François
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#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
#include "shadowlog.h"
/*
* 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 */
NORETURN static 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
*/
NORETURN
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 (_(" -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, 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, 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, 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 == NULL) {
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'},
{"force", no_argument, NULL, 'f'},
{"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]);
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);
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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