596 lines
14 KiB
C
596 lines
14 KiB
C
/*
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* Copyright 1991 - 1994, Julianne Frances Haugh
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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. Neither the name of Julianne F. Haugh nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* 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 <getopt.h>
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#include <grp.h>
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#include <stdio.h>
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#include <sys/types.h>
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#ifdef USE_PAM
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#include "pam_defs.h"
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#include <pwd.h>
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#endif /* USE_PAM */
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#include "chkname.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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* 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_BAD_ARG 3 /* invalid argument to option */
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#define E_GID_IN_USE 4 /* gid already in use (and no -o) */
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#define E_NOTFOUND 6 /* specified group doesn't exist */
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#define E_NAME_IN_USE 9 /* group name already in use */
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#define E_GRP_UPDATE 10 /* can't update group file */
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/*
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* Global variables
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*/
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#ifdef SHADOWGRP
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static int is_shadow_grp;
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#endif
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static char *group_name;
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static char *group_newname;
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static gid_t group_id;
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static gid_t group_newid;
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static char *Prog;
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static int
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oflg = 0, /* permit non-unique group ID to be specified with -g */
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gflg = 0, /* new ID value for the group */
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nflg = 0; /* a new name has been specified for the group */
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/* local function prototypes */
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static void usage (void);
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static void new_grent (struct group *);
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#ifdef SHADOWGRP
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static void new_sgent (struct sgrp *);
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#endif
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static void grp_update (void);
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static void check_new_gid (void);
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static void check_new_name (void);
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static void process_flags (int, char **);
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static void close_files (void);
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static void open_files (void);
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static gid_t get_gid (const char *gidstr);
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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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fprintf (stderr, _("Usage: groupmod [options] GROUP\n"
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"\n"
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"Options:\n"
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" -g, --gid GID force use new GID by GROUP\n"
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" -h, --help display this help message and exit\n"
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" -n, --new-name NEW_GROUP force use NEW_GROUP name by GROUP\n"
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" -o, --non-unique allow using duplicate (non-unique) GID by GROUP\n"
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"\n"));
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exit (E_USAGE);
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}
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/*
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* new_grent - updates the values in a group file entry
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*
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* new_grent() takes all of the values that have been entered and fills
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* in a (struct group) with them.
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*/
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static void new_grent (struct group *grent)
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{
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if (nflg)
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grent->gr_name = xstrdup (group_newname);
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if (gflg)
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grent->gr_gid = group_newid;
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}
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#ifdef SHADOWGRP
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/*
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* new_sgent - updates the values in a shadow group file entry
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*
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* new_sgent() takes all of the values that have been entered and fills
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* in a (struct sgrp) with them.
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*/
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static void new_sgent (struct sgrp *sgent)
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{
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if (nflg)
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sgent->sg_name = xstrdup (group_newname);
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}
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#endif /* SHADOWGRP */
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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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struct group grp;
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const struct group *ogrp;
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#ifdef SHADOWGRP
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struct sgrp sgrp;
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const struct sgrp *osgrp = NULL;
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#endif /* SHADOWGRP */
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/*
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* Get the current settings for this group.
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*/
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ogrp = gr_locate (group_name);
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if (!ogrp) {
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fprintf (stderr,
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_("%s: %s not found in /etc/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, "modifying group",
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group_name, -1, 0);
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#endif
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exit (E_GRP_UPDATE);
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}
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grp = *ogrp;
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new_grent (&grp);
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#ifdef SHADOWGRP
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if (is_shadow_grp && (osgrp = sgr_locate (group_name))) {
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sgrp = *osgrp;
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new_sgent (&sgrp);
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}
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#endif /* SHADOWGRP */
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/*
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* Write out the new group file entry.
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*/
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if (!gr_update (&grp)) {
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fprintf (stderr, _("%s: error adding new group entry\n"), Prog);
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#ifdef WITH_AUDIT
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audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "adding group",
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group_name, -1, 0);
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#endif
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exit (E_GRP_UPDATE);
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}
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if (nflg && !gr_remove (group_name)) {
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fprintf (stderr, _("%s: error removing group entry\n"), Prog);
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#ifdef WITH_AUDIT
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audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "deleting group",
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group_name, -1, 0);
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#endif
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exit (E_GRP_UPDATE);
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}
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#ifdef SHADOWGRP
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/*
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* Make sure there was a shadow entry to begin with. Skip down to
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* "out" if there wasn't. Can't just return because there might be
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* some syslogging to do.
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*/
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if (!osgrp)
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goto out;
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/*
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* Write out the new shadow group entries as well.
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*/
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if (!sgr_update (&sgrp)) {
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fprintf (stderr, _("%s: error adding new group entry\n"), Prog);
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#ifdef WITH_AUDIT
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audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "adding group",
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group_name, -1, 0);
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#endif
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exit (E_GRP_UPDATE);
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}
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if (nflg && !sgr_remove (group_name)) {
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fprintf (stderr, _("%s: error removing group entry\n"), Prog);
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#ifdef WITH_AUDIT
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audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "deleting group",
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group_name, -1, 0);
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#endif
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exit (E_GRP_UPDATE);
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}
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out:
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#endif /* SHADOWGRP */
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#ifdef WITH_AUDIT
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audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "modifing group", group_name,
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group_id, 1);
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#endif
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if (nflg)
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SYSLOG ((LOG_INFO, "change group `%s' to `%s'",
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group_name, group_newname));
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if (gflg)
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SYSLOG ((LOG_INFO, "change GID for `%s' to %u",
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nflg ? group_newname : group_name, group_newid));
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}
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/*
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* check_new_gid - check the new GID value for uniqueness
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*
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* check_new_gid() insures that the new GID value is unique.
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*/
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static void check_new_gid (void)
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{
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/*
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* First, the easy stuff. If the ID can be duplicated, or if the ID
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* didn't really change, just return. If the ID didn't change, turn
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* off those flags. No sense doing needless work.
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*/
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if (group_id == group_newid) {
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gflg = 0;
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return;
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}
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if (oflg || !getgrgid (group_newid)) /* local, no need for xgetgrgid */
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return;
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/*
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* Tell the user what they did wrong.
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*/
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fprintf (stderr, _("%s: %u is not a unique GID\n"), Prog, group_newid);
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#ifdef WITH_AUDIT
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audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "modify gid", NULL,
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group_newid, 0);
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#endif
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exit (E_GID_IN_USE);
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}
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/*
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* check_new_name - check the new name for uniqueness
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*
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* check_new_name() insures that the new name does not exist already.
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* You can't have the same name twice, period.
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*/
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static void check_new_name (void)
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{
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/*
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* Make sure they are actually changing the name.
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*/
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if (strcmp (group_name, group_newname) == 0) {
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nflg = 0;
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return;
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}
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if (check_group_name (group_newname)) {
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/*
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* If the entry is found, too bad.
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*/
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/* local, no need for xgetgrnam */
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if (getgrnam (group_newname)) {
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fprintf (stderr,
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_("%s: %s is not a unique name\n"), Prog,
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group_newname);
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#ifdef WITH_AUDIT
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audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
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"modifying group", group_name, -1, 0);
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#endif
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exit (E_NAME_IN_USE);
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}
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return;
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}
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/*
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* All invalid group names land here.
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*/
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fprintf (stderr, _("%s: %s is not a valid group name\n"),
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Prog, group_newname);
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#ifdef WITH_AUDIT
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audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "modifying group", group_name,
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-1, 0);
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#endif
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exit (E_BAD_ARG);
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}
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/*
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* get_id - validate and get group ID
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*/
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static gid_t get_gid (const char *gidstr)
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{
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long val;
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char *errptr;
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val = strtol (gidstr, &errptr, 10);
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if (*errptr || errno == ERANGE || val < 0) {
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fprintf (stderr, _("%s: invalid numeric argument '%s'\n"), Prog,
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gidstr);
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exit (E_BAD_ARG);
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}
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return val;
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}
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/*
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* process_flags - perform command line argument setting
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*
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* process_flags() interprets the command line arguments and sets the
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* values that the user will be created with accordingly. The values
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* are checked for sanity.
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*/
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static void process_flags (int argc, char **argv)
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{
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{
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int option_index = 0;
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int c;
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static struct option long_options[] = {
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{"gid", required_argument, NULL, 'g'},
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{"help", no_argument, NULL, 'h'},
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{"new-name", required_argument, NULL, 'n'},
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{"non-unique", no_argument, NULL, 'o'},
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{NULL, 0, NULL, '\0'}
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};
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while ((c =
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getopt_long (argc, argv, "g:hn:o",
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long_options, &option_index)) != -1) {
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switch (c) {
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case 'g':
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gflg++;
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group_newid = get_gid (optarg);
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#ifdef WITH_AUDIT
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audit_logger (AUDIT_USER_CHAUTHTOK,
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Prog, "modifying group",
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NULL, group_newid, 0);
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#endif
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break;
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case 'n':
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nflg++;
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group_newname = optarg;
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break;
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case 'o':
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oflg++;
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break;
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default:
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usage ();
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}
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}
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}
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if (oflg && !gflg)
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usage ();
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if (optind != argc - 1)
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usage ();
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group_name = argv[argc - 1];
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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 new
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* 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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if (!gr_close ()) {
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fprintf (stderr, _("%s: cannot rewrite group file\n"), Prog);
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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 ()) {
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fprintf (stderr,
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_("%s: cannot rewrite shadow group file\n"), Prog);
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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 ()) {
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fprintf (stderr, _("%s: unable to lock group file\n"), Prog);
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exit (E_GRP_UPDATE);
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}
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if (!gr_open (O_RDWR)) {
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fprintf (stderr, _("%s: unable to open group file\n"), Prog);
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exit (E_GRP_UPDATE);
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}
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#ifdef SHADOWGRP
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if (is_shadow_grp && !sgr_lock ()) {
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fprintf (stderr,
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_("%s: unable to lock shadow group file\n"), Prog);
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exit (E_GRP_UPDATE);
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}
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if (is_shadow_grp && !sgr_open (O_RDWR)) {
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fprintf (stderr,
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_("%s: unable to open shadow group file\n"), Prog);
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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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* main - groupmod command
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*
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* The syntax of the groupmod command is
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*
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* groupmod [ -g gid [ -o ]] [ -n name ] group
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*
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* The flags are
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* -g - specify a new group ID value
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* -o - permit the group ID value to be non-unique
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* -n - specify a new group name
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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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setlocale (LC_ALL, "");
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bindtextdomain (PACKAGE, LOCALEDIR);
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textdomain (PACKAGE);
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process_flags (argc, argv);
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OPENLOG ("groupmod");
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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 (retval == PAM_SUCCESS) {
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retval = pam_start ("groupmod", pampw->pw_name,
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&conv, &pamh);
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}
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}
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if (retval == PAM_SUCCESS) {
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retval = pam_authenticate (pamh, 0);
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if (retval != PAM_SUCCESS) {
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pam_end (pamh, retval);
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}
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}
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if (retval == PAM_SUCCESS) {
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retval = pam_acct_mgmt (pamh, 0);
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if (retval != PAM_SUCCESS) {
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pam_end (pamh, retval);
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}
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}
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if (retval != PAM_SUCCESS) {
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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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/* local, no need for xgetgrnam */
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if (!(grp = getgrnam (group_name))) {
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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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"modifying group", group_name, -1, 0);
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#endif
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exit (E_NOTFOUND);
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} else
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group_id = grp->gr_gid;
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}
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#ifdef WITH_AUDIT
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/* Set new name/id to original if not specified on command line */
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if (nflg == 0)
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|
group_newname = group_name;
|
|
if (gflg == 0)
|
|
group_newid = group_id;
|
|
#endif
|
|
|
|
#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);
|
|
|
|
#ifdef WITH_AUDIT
|
|
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "modifying group",
|
|
group_name, -1, 0);
|
|
#endif
|
|
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 ();
|
|
|
|
/*
|
|
* 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");
|
|
|
|
#ifdef USE_PAM
|
|
if (retval == PAM_SUCCESS)
|
|
pam_end (pamh, PAM_SUCCESS);
|
|
#endif /* USE_PAM */
|
|
exit (E_SUCCESS);
|
|
/* NOT REACHED */
|
|
}
|