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289913e5ff
shadow/src/groupmod.c
nekral-guest 289913e5ff * NEWS, src/groupmod.c: Fixed groupmod when configured with 
--enable-account-tools-setuid.
2009-11-05 22:03:36 +00:00

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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 - 2009, 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 <getopt.h>
#include <grp.h>
#include <stdio.h>
#include <sys/types.h>
#ifdef ACCT_TOOLS_SETUID
#ifdef USE_PAM
#include "pam_defs.h"
#include <pwd.h>
#endif /* USE_PAM */
#endif /* ACCT_TOOLS_SETUID */
#include "chkname.h"
#include "defines.h"
#include "groupio.h"
#include "pwio.h"
#include "nscd.h"
#include "prototypes.h"
#ifdef SHADOWGRP
#include "sgroupio.h"
#endif
/*
* exit status values
*/
/*@-exitarg@*/
#define E_SUCCESS 0 /* success */
#define E_USAGE 2 /* invalid command syntax */
#define E_BAD_ARG 3 /* invalid argument to option */
#define E_GID_IN_USE 4 /* gid already in use (and no -o) */
#define E_NOTFOUND 6 /* specified group doesn't exist */
#define E_NAME_IN_USE 9 /* group name already in use */
#define E_GRP_UPDATE 10 /* can't update group file */
/*
* Global variables
*/
char *Prog;
#ifdef SHADOWGRP
static bool is_shadow_grp;
#endif /* SHADOWGRP */
static char *group_name;
static char *group_newname;
static char *group_passwd;
static gid_t group_id;
static gid_t group_newid;
struct cleanup_info_mod info_passwd;
struct cleanup_info_mod info_group;
#ifdef SHADOWGRP
struct cleanup_info_mod info_gshadow;
#endif
static bool
oflg = false, /* permit non-unique group ID to be specified with -g */
gflg = false, /* new ID value for the group */
nflg = false, /* a new name has been specified for the group */
pflg = false; /* new encrypted password */
/* local function prototypes */
static void usage (int status);
static void new_grent (struct group *);
#ifdef SHADOWGRP
static void new_sgent (struct sgrp *);
#endif
static void grp_update (void);
static void check_new_gid (void);
static void check_new_name (void);
static void process_flags (int, char **);
static void lock_files (void);
static void prepare_failure_reports (void);
static void open_files (void);
static void close_files (void);
static void update_primary_groups (gid_t ogid, gid_t ngid);
/*
* usage - display usage message and exit
*/
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 (_(" -g, --gid GID change the group ID to GID\n"), usageout);
(void) fputs (_(" -h, --help display this help message and exit\n"), usageout);
(void) fputs (_(" -n, --new-name NEW_GROUP change the name to NEW_GROUP\n"), usageout);
(void) fputs (_(" -o, --non-unique allow to use a duplicate (non-unique) GID\n"), usageout);
(void) fputs (_(" -p, --password PASSWORD change the password to this (encrypted)\n"
" PASSWORD\n"), usageout);
(void) fputs ("\n", usageout);
exit (status);
}
/*
* new_grent - updates the values in a group file entry
*
* new_grent() takes all of the values that have been entered and fills
* in a (struct group) with them.
*/
static void new_grent (struct group *grent)
{
if (nflg) {
grent->gr_name = xstrdup (group_newname);
}
if (gflg) {
grent->gr_gid = group_newid;
}
if (pflg) {
grent->gr_passwd = group_passwd;
}
}
#ifdef SHADOWGRP
/*
* new_sgent - updates the values in a shadow group file entry
*
* new_sgent() takes all of the values that have been entered and fills
* in a (struct sgrp) with them.
*/
static void new_sgent (struct sgrp *sgent)
{
if (nflg) {
sgent->sg_name = xstrdup (group_newname);
}
if (pflg) {
sgent->sg_passwd = group_passwd;
}
}
#endif /* SHADOWGRP */
/*
* grp_update - update group file entries
*
* grp_update() updates the new records in the memory databases.
*/
static void grp_update (void)
{
struct group grp;
const struct group *ogrp;
#ifdef SHADOWGRP
struct sgrp sgrp;
const struct sgrp *osgrp = NULL;
#endif /* SHADOWGRP */
/*
* Get the current settings for this group.
*/
ogrp = gr_locate (group_name);
if (!ogrp) {
fprintf (stderr,
_("%s: group '%s' does not exist in %s\n"),
Prog, group_name, gr_dbname ());
exit (E_GRP_UPDATE);
}
grp = *ogrp;
new_grent (&grp);
#ifdef SHADOWGRP
if ( is_shadow_grp
&& (pflg || nflg)) {
osgrp = sgr_locate (group_name);
if (NULL != osgrp) {
sgrp = *osgrp;
new_sgent (&sgrp);
if (pflg) {
grp.gr_passwd = SHADOW_PASSWD_STRING;
}
}
}
#endif /* SHADOWGRP */
if (gflg) {
update_primary_groups (ogrp->gr_gid, group_newid);
}
/*
* Write out the new group file entry.
*/
if (gr_update (&grp) == 0) {
fprintf (stderr,
_("%s: failed to prepare the new %s entry '%s'\n"),
Prog, gr_dbname (), grp.gr_name);
exit (E_GRP_UPDATE);
}
if (nflg && (gr_remove (group_name) == 0)) {
fprintf (stderr,
_("%s: cannot remove entry '%s' from %s\n"),
Prog, grp.gr_name, gr_dbname ());
exit (E_GRP_UPDATE);
}
#ifdef SHADOWGRP
/*
* Make sure there was a shadow entry to begin with.
*/
if ( (NULL != osgrp)
&& (pflg || nflg)) {
/*
* Write out the new shadow group entries as well.
*/
if (sgr_update (&sgrp) == 0) {
fprintf (stderr,
_("%s: failed to prepare the new %s entry '%s'\n"),
Prog, sgr_dbname (), sgrp.sg_name);
exit (E_GRP_UPDATE);
}
if (nflg && (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 */
}
/*
* check_new_gid - check the new GID value for uniqueness
*
* check_new_gid() insures that the new GID value is unique.
*/
static void check_new_gid (void)
{
/*
* First, the easy stuff. If the ID can be duplicated, or if the ID
* didn't really change, just return. If the ID didn't change, turn
* off those flags. No sense doing needless work.
*/
if (group_id == group_newid) {
gflg = 0;
return;
}
if (oflg ||
(getgrgid (group_newid) == NULL) /* local, no need for xgetgrgid */
) {
return;
}
/*
* Tell the user what they did wrong.
*/
fprintf (stderr,
_("%s: GID '%lu' already exists\n"),
Prog, (unsigned long int) group_newid);
exit (E_GID_IN_USE);
}
/*
* check_new_name - check the new name for uniqueness
*
* check_new_name() insures that the new name does not exist already.
* You can't have the same name twice, period.
*/
static void check_new_name (void)
{
/*
* Make sure they are actually changing the name.
*/
if (strcmp (group_name, group_newname) == 0) {
nflg = 0;
return;
}
if (is_valid_group_name (group_newname)) {
/*
* If the entry is found, too bad.
*/
/* local, no need for xgetgrnam */
if (getgrnam (group_newname) != NULL) {
fprintf (stderr,
_("%s: group '%s' already exists\n"),
Prog, group_newname);
exit (E_NAME_IN_USE);
}
return;
}
/*
* All invalid group names land here.
*/
fprintf (stderr,
_("%s: invalid group name '%s'\n"),
Prog, group_newname);
exit (E_BAD_ARG);
}
/*
* process_flags - perform command line argument setting
*
* process_flags() interprets the command line arguments and sets the
* values that the user will be created with accordingly. The values
* are checked for sanity.
*/
static void process_flags (int argc, char **argv)
{
int option_index = 0;
int c;
static struct option long_options[] = {
{"gid", required_argument, NULL, 'g'},
{"help", no_argument, NULL, 'h'},
{"new-name", required_argument, NULL, 'n'},
{"non-unique", no_argument, NULL, 'o'},
{"password", required_argument, NULL, 'p'},
{NULL, 0, NULL, '\0'}
};
while ((c =
getopt_long (argc, argv, "g:hn:op:",
long_options, &option_index)) != -1) {
switch (c) {
case 'g':
gflg = true;
if ( (get_gid (optarg, &group_newid) == 0)
|| (group_newid == (gid_t)-1)) {
fprintf (stderr,
_("%s: invalid group ID '%s'\n"),
Prog, optarg);
exit (E_BAD_ARG);
}
break;
case 'h':
usage (E_SUCCESS);
break;
case 'n':
nflg = true;
group_newname = optarg;
break;
case 'o':
oflg = true;
break;
case 'p':
group_passwd = optarg;
pflg = true;
break;
default:
usage (E_USAGE);
}
}
if (oflg && !gflg) {
usage (E_USAGE);
}
if (optind != (argc - 1)) {
usage (E_USAGE);
}
group_name = argv[argc - 1];
}
/*
* 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)
{
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_USER_ACCT, Prog,
info_group.audit_msg,
group_name, AUDIT_NO_ID,
SHADOW_AUDIT_SUCCESS);
#endif
SYSLOG ((LOG_INFO,
"group changed in %s (%s)",
gr_dbname (), info_group.action));
del_cleanup (cleanup_report_mod_group);
cleanup_unlock_group (NULL);
del_cleanup (cleanup_unlock_group);
#ifdef SHADOWGRP
if ( is_shadow_grp
&& (pflg || nflg)) {
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_USER_ACCT, Prog,
info_gshadow.audit_msg,
group_name, AUDIT_NO_ID,
SHADOW_AUDIT_SUCCESS);
#endif
SYSLOG ((LOG_INFO,
"group changed in %s (%s)",
sgr_dbname (), info_gshadow.action));
del_cleanup (cleanup_report_mod_gshadow);
cleanup_unlock_gshadow (NULL);
del_cleanup (cleanup_unlock_gshadow);
}
#endif /* SHADOWGRP */
if (gflg) {
if (pw_close () == 0) {
fprintf (stderr,
_("%s: failure while writing changes to %s\n"),
Prog, pw_dbname ());
exit (E_GRP_UPDATE);
}
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_ACCT, Prog,
info_passwd.audit_msg,
group_name, AUDIT_NO_ID,
SHADOW_AUDIT_SUCCESS);
#endif
SYSLOG ((LOG_INFO,
"group changed in %s (%s)",
pw_dbname (), info_passwd.action));
del_cleanup (cleanup_report_mod_passwd);
cleanup_unlock_passwd (NULL);
del_cleanup (cleanup_unlock_passwd);
}
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_ACCT, Prog,
"modifying group",
group_name, AUDIT_NO_ID,
SHADOW_AUDIT_SUCCESS);
#endif
}
/*
* prepare_failure_reports - Prepare the cleanup_info structure for logging
* of success and failure to syslog or audit.
*/
static void prepare_failure_reports (void)
{
info_group.name = group_name;
#ifdef SHADOWGRP
info_gshadow.name = group_name;
#endif
info_passwd.name = group_name;
info_group.audit_msg = xmalloc (512);
#ifdef SHADOWGRP
info_gshadow.audit_msg = xmalloc (512);
#endif
info_passwd.audit_msg = xmalloc (512);
snprintf (info_group.audit_msg, 511,
"changing %s; ", gr_dbname ());
#ifdef SHADOWGRP
snprintf (info_gshadow.audit_msg, 511,
"changing %s; ", sgr_dbname ());
#endif
snprintf (info_passwd.audit_msg, 511,
"changing %s; ", pw_dbname ());
info_group.action = info_group.audit_msg
+ strlen (info_group.audit_msg);
#ifdef SHADOWGRP
info_gshadow.action = info_gshadow.audit_msg
+ strlen (info_gshadow.audit_msg);
#endif
info_passwd.action = info_passwd.audit_msg
+ strlen (info_passwd.audit_msg);
snprintf (info_group.action, 511 - strlen (info_group.audit_msg),
"group %s/%lu", group_name, (unsigned long int) group_id);
#ifdef SHADOWGRP
snprintf (info_gshadow.action, 511 - strlen (info_group.audit_msg),
"group %s", group_name);
#endif
snprintf (info_passwd.action, 511 - strlen (info_group.audit_msg),
"group %s/%lu", group_name, (unsigned long int) group_id);
if (nflg) {
strncat (info_group.action, ", new name: ",
511 - strlen (info_group.audit_msg));
strncat (info_group.action, group_newname,
511 - strlen (info_group.audit_msg));
#ifdef SHADOWGRP
strncat (info_gshadow.action, ", new name: ",
511 - strlen (info_gshadow.audit_msg));
strncat (info_gshadow.action, group_newname,
511 - strlen (info_gshadow.audit_msg));
#endif
strncat (info_passwd.action, ", new name: ",
511 - strlen (info_passwd.audit_msg));
strncat (info_passwd.action, group_newname,
511 - strlen (info_passwd.audit_msg));
}
if (pflg) {
strncat (info_group.action, ", new password",
511 - strlen (info_group.audit_msg));
#ifdef SHADOWGRP
strncat (info_gshadow.action, ", new password",
511 - strlen (info_gshadow.audit_msg));
#endif
}
if (gflg) {
strncat (info_group.action, ", new gid: ",
511 - strlen (info_group.audit_msg));
snprintf (info_group.action+strlen (info_group.action),
511 - strlen (info_group.audit_msg),
"%lu", (unsigned long int) group_newid);
strncat (info_passwd.action, ", new gid: ",
511 - strlen (info_passwd.audit_msg));
snprintf (info_passwd.action+strlen (info_passwd.action),
511 - strlen (info_passwd.audit_msg),
"%lu", (unsigned long int) group_newid);
}
info_group.audit_msg[511] = '\0';
#ifdef SHADOWGRP
info_gshadow.audit_msg[511] = '\0';
#endif
info_passwd.audit_msg[511] = '\0';
// FIXME: add a system cleanup
add_cleanup (cleanup_report_mod_group, &info_group);
#ifdef SHADOWGRP
if ( is_shadow_grp
&& (pflg || nflg)) {
add_cleanup (cleanup_report_mod_gshadow, &info_gshadow);
}
#endif
if (gflg) {
add_cleanup (cleanup_report_mod_passwd, &info_passwd);
}
}
/*
* lock_files - lock the accounts databases
*
* lock_files() locks the group, gshadow, and passwd databases.
*/
static void lock_files (void)
{
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
&& (pflg || nflg)) {
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
if (gflg) {
if (pw_lock () == 0) {
fprintf (stderr,
_("%s: cannot lock %s; try again later.\n"),
Prog, pw_dbname ());
exit (E_GRP_UPDATE);
}
add_cleanup (cleanup_unlock_passwd, NULL);
}
}
/*
* open_files - open the accounts databases
*
* open_files() opens the group, gshadow, and passwd databases.
*/
static void open_files (void)
{
if (gr_open (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
&& (pflg || nflg)) {
if (sgr_open (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 */
if (gflg) {
if (pw_open (O_RDWR) == 0) {
fprintf (stderr,
_("%s: cannot open %s\n"),
Prog, pw_dbname ());
SYSLOG ((LOG_WARN, "cannot open %s", gr_dbname ()));
exit (E_GRP_UPDATE);
}
}
}
void update_primary_groups (gid_t ogid, gid_t ngid)
{
struct passwd *pwd;
setpwent ();
while ((pwd = getpwent ()) != NULL) {
if (pwd->pw_gid == ogid) {
const struct passwd *lpwd;
struct passwd npwd;
lpwd = pw_locate (pwd->pw_name);
if (NULL == lpwd) {
fprintf (stderr,
_("%s: user '%s' does not exist in %s\n"),
Prog, pwd->pw_name, pw_dbname ());
exit (E_GRP_UPDATE);
} else {
npwd = *lpwd;
npwd.pw_gid = ngid;
if (pw_update (&npwd) == 0) {
fprintf (stderr,
_("%s: failed to prepare the new %s entry '%s'\n"),
Prog, pw_dbname (), npwd.pw_name);
exit (E_GRP_UPDATE);
}
}
}
}
endpwent ();
}
/*
* main - groupmod command
*
*/
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 */
#ifdef WITH_AUDIT
audit_help_open ();
#endif
atexit (do_cleanups);
/*
* 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_flags (argc, argv);
OPENLOG ("groupmod");
#ifdef ACCT_TOOLS_SETUID
#ifdef USE_PAM
{
struct passwd *pampw;
pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
if (NULL == pampw) {
fprintf (stderr,
_("%s: Cannot determine your user name.\n"),
Prog);
exit (1);
}
retval = pam_start ("groupmod", 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 (NULL != pamh) {
(void) pam_end (pamh, retval);
}
if (PAM_SUCCESS != retval) {
fprintf (stderr, _("%s: PAM authentication failed\n"), Prog);
exit (1);
}
#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 = 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);
} else {
group_id = grp->gr_gid;
}
}
#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);
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 ();
}
lock_files ();
/*
* Now if the group is not changed, it's our fault.
* Make sure failures will be reported.
*/
prepare_failure_reports ();
/*
* 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");
return E_SUCCESS;
}
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