383 lines
8.8 KiB
C
383 lines
8.8 KiB
C
/*
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* Copyright (c) 1991 - 1994, Julianne Frances Haugh
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* Copyright (c) 1996 - 2000, Marek Michałkiewicz
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* Copyright (c) 2000 - 2006, Tomasz Kłoczko
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* Copyright (c) 2007 - 2008, Nicolas François
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the copyright holders or contributors may not be used to
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* endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <config.h>
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#ident "$Id$"
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#include <ctype.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <pwd.h>
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#ifdef USE_PAM
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#include "pam_defs.h"
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#endif /* USE_PAM */
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#include <stdio.h>
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#include <sys/types.h>
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#include "defines.h"
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#include "groupio.h"
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#include "nscd.h"
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#include "prototypes.h"
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#ifdef SHADOWGRP
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#include "sgroupio.h"
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#endif
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/*
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* Global variables
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*/
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static char *group_name;
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static char *Prog;
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static gid_t group_id = -1;
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#ifdef SHADOWGRP
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static bool is_shadow_grp;
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#endif
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/*
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* exit status values
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*/
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#define E_SUCCESS 0 /* success */
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#define E_USAGE 2 /* invalid command syntax */
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#define E_NOTFOUND 6 /* specified group doesn't exist */
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#define E_GROUP_BUSY 8 /* can't remove user's primary group */
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#define E_GRP_UPDATE 10 /* can't update group file */
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/* local function prototypes */
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static void usage (void);
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static void fail_exit (int);
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static void grp_update (void);
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static void close_files (void);
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static void open_files (void);
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static void group_busy (gid_t);
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/*
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* usage - display usage message and exit
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*/
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static void usage (void)
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{
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fputs (_("Usage: groupdel group\n"), stderr);
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exit (E_USAGE);
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}
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/*
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* fail_exit - exit with a failure code after unlocking the files
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*/
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static void fail_exit (int code)
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{
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(void) gr_unlock ();
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#ifdef SHADOWGRP
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if (is_shadow_grp) {
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sgr_unlock ();
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}
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#endif
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#ifdef WITH_AUDIT
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audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
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"deleting group",
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group_name, AUDIT_NO_ID, 0);
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#endif
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exit (code);
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}
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/*
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* grp_update - update group file entries
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*
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* grp_update() writes the new records to the group files.
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*/
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static void grp_update (void)
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{
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if (gr_remove (group_name) == 0) {
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fprintf (stderr, _("%s: cannot remove group '%s' from the group database\n"), Prog, group_name);
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fail_exit (E_GRP_UPDATE);
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}
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#ifdef SHADOWGRP
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/*
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* Delete the shadow group entries as well.
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*/
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if (is_shadow_grp && (sgr_locate (group_name) != NULL)) {
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if (sgr_remove (group_name) == 0) {
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fprintf (stderr,
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_("%s: cannot remove group '%s' from the shadow group database\n"),
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Prog, group_name);
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fail_exit (E_GRP_UPDATE);
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}
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}
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#endif /* SHADOWGRP */
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return;
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}
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/*
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* close_files - close all of the files that were opened
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*
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* close_files() closes all of the files that were opened for this
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* new group. This causes any modified entries to be written out.
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*/
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static void close_files (void)
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{
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#ifdef WITH_AUDIT
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audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
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"deleting group",
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group_name, (unsigned int) group_id, 1);
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#endif
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SYSLOG ((LOG_INFO, "remove group '%s'\n", group_name));
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if (gr_close () == 0) {
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fprintf (stderr, _("%s: cannot rewrite the group file\n"), Prog);
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fail_exit (E_GRP_UPDATE);
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}
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gr_unlock ();
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#ifdef SHADOWGRP
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if (is_shadow_grp && (sgr_close () == 0)) {
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fprintf (stderr,
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_("%s: cannot rewrite the shadow group file\n"), Prog);
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fail_exit (E_GRP_UPDATE);
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}
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if (is_shadow_grp)
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sgr_unlock ();
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#endif /* SHADOWGRP */
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}
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/*
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* open_files - lock and open the group files
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*
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* open_files() opens the two group files.
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*/
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static void open_files (void)
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{
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if (gr_lock () == 0) {
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fprintf (stderr, _("%s: cannot lock the group file\n"), Prog);
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fail_exit (E_GRP_UPDATE);
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}
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if (gr_open (O_RDWR) == 0) {
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fprintf (stderr, _("%s: cannot open the group file\n"), Prog);
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fail_exit (E_GRP_UPDATE);
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}
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#ifdef SHADOWGRP
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if (is_shadow_grp && (sgr_lock () == 0)) {
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fprintf (stderr,
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_("%s: cannot lock the shadow group file\n"), Prog);
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fail_exit (E_GRP_UPDATE);
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}
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if (is_shadow_grp && (sgr_open (O_RDWR) == 0)) {
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fprintf (stderr,
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_("%s: cannot open the shadow group file\n"), Prog);
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fail_exit (E_GRP_UPDATE);
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}
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#endif /* SHADOWGRP */
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}
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/*
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* group_busy - check if this is any user's primary group
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*
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* group_busy verifies that this group is not the primary group
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* for any user. You must remove all users before you remove
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* the group.
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*/
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static void group_busy (gid_t gid)
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{
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struct passwd *pwd;
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/*
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* Nice slow linear search.
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*/
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setpwent ();
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while ( ((pwd = getpwent ()) != NULL) && (pwd->pw_gid != gid) );
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endpwent ();
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/*
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* If pwd isn't NULL, it stopped because the gid's matched.
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*/
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if (pwd == (struct passwd *) 0)
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return;
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/*
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* Can't remove the group.
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*/
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fprintf (stderr, _("%s: cannot remove the primary group of user '%s'\n"), Prog, pwd->pw_name);
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fail_exit (E_GROUP_BUSY);
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}
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/*
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* main - groupdel command
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*
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* The syntax of the groupdel command is
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*
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* groupdel group
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*
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* The named group will be deleted.
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*/
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int main (int argc, char **argv)
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{
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#ifdef USE_PAM
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pam_handle_t *pamh = NULL;
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int retval;
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#endif
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#ifdef WITH_AUDIT
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audit_help_open ();
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#endif
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/*
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* Get my name so that I can use it to report errors.
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*/
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Prog = Basename (argv[0]);
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(void) setlocale (LC_ALL, "");
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(void) bindtextdomain (PACKAGE, LOCALEDIR);
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(void) textdomain (PACKAGE);
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if (argc != 2)
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usage ();
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group_name = argv[1];
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OPENLOG ("groupdel");
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#ifdef USE_PAM
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retval = PAM_SUCCESS;
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{
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struct passwd *pampw;
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pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
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if (pampw == NULL) {
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retval = PAM_USER_UNKNOWN;
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}
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if (PAM_SUCCESS == retval) {
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retval = pam_start ("groupdel", pampw->pw_name,
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&conv, &pamh);
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}
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}
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if (PAM_SUCCESS == retval) {
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retval = pam_authenticate (pamh, 0);
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if (PAM_SUCCESS != retval) {
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(void) pam_end (pamh, retval);
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}
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}
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if (PAM_SUCCESS == retval) {
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retval = pam_acct_mgmt (pamh, 0);
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if (PAM_SUCCESS != retval) {
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(void) pam_end (pamh, retval);
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}
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}
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if (PAM_SUCCESS != retval) {
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fprintf (stderr, _("%s: PAM authentication failed\n"), Prog);
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exit (1);
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}
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#endif /* USE_PAM */
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#ifdef SHADOWGRP
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is_shadow_grp = sgr_file_present ();
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#endif
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{
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struct group *grp;
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/*
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* Start with a quick check to see if the group exists.
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*/
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grp = getgrnam (group_name); /* local, no need for xgetgrnam */
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if (NULL == grp) {
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fprintf (stderr, _("%s: group '%s' does not exist\n"),
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Prog, group_name);
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#ifdef WITH_AUDIT
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audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
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"deleting group",
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group_name, AUDIT_NO_ID, 0);
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#endif
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exit (E_NOTFOUND);
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}
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group_id = grp->gr_gid; /* LAUS */
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}
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#ifdef USE_NIS
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/*
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* Make sure this isn't a NIS group
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*/
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if (__isgrNIS ()) {
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char *nis_domain;
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char *nis_master;
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fprintf (stderr, _("%s: group '%s' is a NIS group\n"),
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Prog, group_name);
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#ifdef WITH_AUDIT
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audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
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"deleting group",
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group_name, AUDIT_NO_ID, 0);
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#endif
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if (!yp_get_default_domain (&nis_domain) &&
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!yp_master (nis_domain, "group.byname", &nis_master)) {
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fprintf (stderr, _("%s: %s is the NIS master\n"),
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Prog, nis_master);
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}
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exit (E_NOTFOUND);
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}
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#endif
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/*
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* Now check to insure that this isn't the primary group of
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* anyone.
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*/
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group_busy (group_id);
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/*
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* Do the hard stuff - open the files, delete the group entries,
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* then close and update the files.
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*/
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open_files ();
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grp_update ();
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close_files ();
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nscd_flush_cache ("group");
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#ifdef USE_PAM
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if (PAM_SUCCESS == retval) {
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(void) pam_end (pamh, PAM_SUCCESS);
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}
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#endif /* USE_PAM */
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return E_SUCCESS;
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}
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