shadow/src/groupadd.c

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/*
* Copyright 1991 - 1993, Julianne Frances Haugh
* 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. Neither the name of Julianne F. Haugh nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH 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 JULIE HAUGH 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>
#include "rcsid.h"
RCSID (PKG_VER "$Id: groupadd.c,v 1.31 2005/04/06 04:26:06 kloczek Exp $")
#include <sys/types.h>
#include <stdio.h>
#include <grp.h>
#include <ctype.h>
#include <fcntl.h>
#include "defines.h"
#include "prototypes.h"
#include "chkname.h"
#include "getdef.h"
#include "groupio.h"
#include "nscd.h"
#ifdef SHADOWGRP
#include "sgroupio.h"
#ifdef USE_PAM
#include <security/pam_appl.h>
#include <security/pam_misc.h>
#include <pwd.h>
#endif /* USE_PAM */
static int is_shadow_grp;
#endif
/*
* exit status values
*/
#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 not unique (when -o not used) */
#define E_NAME_IN_USE 9 /* group name not unique */
#define E_GRP_UPDATE 10 /* can't update group file */
static char *group_name;
static gid_t group_id;
static char *empty_list = NULL;
static char *Prog;
static int oflg = 0; /* permit non-unique group ID to be specified with -g */
static int gflg = 0; /* ID value for the new group */
static int fflg = 0; /* if group already exists, do nothing and exit(0) */
/* local function prototypes */
static void usage (void);
static void new_grent (struct group *);
#ifdef SHADOWGRP
static void new_sgent (struct sgrp *);
#endif
static void grp_update (void);
static void find_new_gid (void);
static void check_new_name (void);
static void process_flags (int, char **);
static void close_files (void);
static void open_files (void);
static void fail_exit (int);
/*
* usage - display usage message and exit
*/
static void usage (void)
{
fprintf (stderr, _("Usage: groupadd [-g gid [-o]] [-f] group\n"));
exit (E_USAGE);
}
/*
* new_grent - initialize 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)
{
memzero (grent, sizeof *grent);
grent->gr_name = group_name;
grent->gr_passwd = SHADOW_PASSWD_STRING; /* XXX warning: const */
grent->gr_gid = group_id;
grent->gr_mem = &empty_list;
}
#ifdef SHADOWGRP
/*
* new_sgent - initialize 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)
{
memzero (sgent, sizeof *sgent);
sgent->sg_name = group_name;
sgent->sg_passwd = "!"; /* XXX warning: const */
sgent->sg_adm = &empty_list;
sgent->sg_mem = &empty_list;
}
#endif /* SHADOWGRP */
/*
* grp_update - add new group file entries
*
* grp_update() writes the new records to the group files.
*/
static void grp_update (void)
{
struct group grp;
#ifdef SHADOWGRP
struct sgrp sgrp;
#endif /* SHADOWGRP */
/*
* Create the initial entries for this new group.
*/
new_grent (&grp);
#ifdef SHADOWGRP
new_sgent (&sgrp);
#endif /* SHADOWGRP */
/*
* Write out the new group file entry.
*/
if (!gr_update (&grp)) {
fprintf (stderr, _("%s: error adding new group entry\n"), Prog);
fail_exit (E_GRP_UPDATE);
}
#ifdef SHADOWGRP
/*
* Write out the new shadow group entries as well.
*/
if (is_shadow_grp && !sgr_update (&sgrp)) {
fprintf (stderr, _("%s: error adding new group entry\n"), Prog);
fail_exit (E_GRP_UPDATE);
}
#endif /* SHADOWGRP */
SYSLOG ((LOG_INFO, "new group: name=%s, gid=%u",
group_name, (unsigned int) group_id));
}
/*
* find_new_gid - find the next available GID
*
* find_new_gid() locates the next highest unused GID in the group
* file, or checks the given group ID against the existing ones for
* uniqueness.
*/
static void find_new_gid (void)
{
const struct group *grp;
gid_t gid_min, gid_max;
gid_min = getdef_unum ("GID_MIN", 100);
gid_max = getdef_unum ("GID_MAX", 60000);
/*
* Start with some GID value if the user didn't provide us with
* one already.
*/
if (!gflg)
group_id = gid_min;
/*
* Search the entire group file, either looking for this GID (if the
* user specified one with -g) or looking for the largest unused
* value.
*/
#ifdef NO_GETGRENT
gr_rewind ();
while ((grp = gr_next ())) {
#else
setgrent ();
while ((grp = getgrent ())) {
#endif
if (strcmp (group_name, grp->gr_name) == 0) {
if (fflg) {
fail_exit (E_SUCCESS);
}
fprintf (stderr, _("%s: name %s is not unique\n"),
Prog, group_name);
fail_exit (E_NAME_IN_USE);
}
if (gflg && group_id == grp->gr_gid) {
if (fflg) {
/* turn off -g and search again */
gflg = 0;
#ifdef NO_GETGRENT
gr_rewind ();
#else
setgrent ();
#endif
continue;
}
fprintf (stderr, _("%s: gid %u is not unique\n"),
Prog, (unsigned int) group_id);
fail_exit (E_GID_IN_USE);
}
if (!gflg && grp->gr_gid >= group_id) {
if (grp->gr_gid > gid_max)
continue;
group_id = grp->gr_gid + 1;
}
}
if (!gflg && group_id == gid_max + 1) {
for (group_id = gid_min; group_id < gid_max; group_id++) {
#ifdef NO_GETGRENT
gr_rewind ();
while ((grp = gr_next ())
&& grp->gr_gid != group_id);
if (!grp)
break;
#else
if (!getgrgid (group_id))
break;
#endif
}
if (group_id == gid_max) {
fprintf (stderr, _("%s: can't get unique gid\n"), Prog);
fail_exit (E_GID_IN_USE);
}
}
}
/*
* check_new_name - check the new name for validity
*
* check_new_name() insures that the new name doesn't contain any
* illegal characters.
*/
static void check_new_name (void)
{
if (check_group_name (group_name))
return;
/*
* All invalid group names land here.
*/
fprintf (stderr, _("%s: %s is not a valid group name\n"),
Prog, group_name);
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)
{
char *cp;
int arg;
while ((arg = getopt (argc, argv, "og:O:f")) != EOF) {
switch (arg) {
case 'g':
gflg++;
if (!isdigit (optarg[0]))
usage ();
group_id = strtoul (optarg, &cp, 10);
if (*cp != '\0') {
fprintf (stderr,
_("%s: invalid group %s\n"), Prog,
optarg);
fail_exit (E_BAD_ARG);
}
break;
case 'o':
oflg++;
break;
case 'O':
/*
* override login.defs defaults (-O name=value)
* example: -O GID_MIN=100 -O GID_MAX=499
* note: -O GID_MIN=10,GID_MAX=499 doesn't work yet
*/
cp = strchr (optarg, '=');
if (!cp) {
fprintf (stderr,
_("%s: -O requires NAME=VALUE\n"),
Prog);
exit (E_BAD_ARG);
}
/* terminate name, point to value */
*cp++ = '\0';
if (putdef_str (optarg, cp) < 0)
exit (E_BAD_ARG);
break;
case 'f':
/*
* "force" - do nothing, just exit(0), if the
* specified group already exists. With -g, if
* specified gid already exists, choose another
* (unique) gid (turn off -g). Based on the RedHat's
* patch from shadow-utils-970616-9.
*/
fflg++;
break;
default:
usage ();
}
}
if (oflg && !gflg)
usage ();
if (optind != argc - 1)
usage ();
group_name = argv[argc - 1];
check_new_name ();
}
/*
* 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 ()) {
fprintf (stderr, _("%s: cannot rewrite group file\n"), Prog);
fail_exit (E_GRP_UPDATE);
}
gr_unlock ();
#ifdef SHADOWGRP
if (is_shadow_grp && !sgr_close ()) {
fprintf (stderr,
_("%s: cannot rewrite shadow group file\n"), Prog);
fail_exit (E_GRP_UPDATE);
}
if (is_shadow_grp)
sgr_unlock ();
#endif /* SHADOWGRP */
}
/*
* open_files - lock and open the group files
*
* open_files() opens the two group files.
*/
static void open_files (void)
{
if (!gr_lock ()) {
fprintf (stderr, _("%s: unable to lock group file\n"), Prog);
exit (E_GRP_UPDATE);
}
if (!gr_open (O_RDWR)) {
fprintf (stderr, _("%s: unable to open group file\n"), Prog);
fail_exit (E_GRP_UPDATE);
}
#ifdef SHADOWGRP
if (is_shadow_grp && !sgr_lock ()) {
fprintf (stderr,
_("%s: unable to lock shadow group file\n"), Prog);
fail_exit (E_GRP_UPDATE);
}
if (is_shadow_grp && !sgr_open (O_RDWR)) {
fprintf (stderr,
_("%s: unable to open shadow group file\n"), Prog);
fail_exit (E_GRP_UPDATE);
}
#endif /* SHADOWGRP */
}
/*
* fail_exit - exit with an error code after unlocking files
*/
static void fail_exit (int code)
{
(void) gr_unlock ();
#ifdef SHADOWGRP
if (is_shadow_grp)
sgr_unlock ();
#endif
exit (code);
}
#ifdef USE_PAM
static struct pam_conv conv = {
misc_conv,
NULL
};
#endif /* USE_PAM */
/*
* main - groupadd command
*/
int main (int argc, char **argv)
{
#ifdef USE_PAM
pam_handle_t *pamh = NULL;
struct passwd *pampw;
int retval;
#endif
/*
* Get my name so that I can use it to report errors.
*/
Prog = Basename (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
OPENLOG ("groupadd");
process_flags (argc, argv);
#ifdef USE_PAM
retval = PAM_SUCCESS;
pampw = getpwuid (getuid ());
if (pampw == NULL) {
retval = PAM_USER_UNKNOWN;
}
if (retval == PAM_SUCCESS) {
retval = pam_start ("groupadd", pampw->pw_name, &conv, &pamh);
}
if (retval == PAM_SUCCESS) {
retval = pam_authenticate (pamh, 0);
if (retval != PAM_SUCCESS) {
pam_end (pamh, retval);
}
}
if (retval == PAM_SUCCESS) {
retval = pam_acct_mgmt (pamh, 0);
if (retval != PAM_SUCCESS) {
pam_end (pamh, retval);
}
}
if (retval != PAM_SUCCESS) {
fprintf (stderr, _("%s: PAM authentication failed\n"), Prog);
exit (1);
}
OPENLOG ("groupadd");
#endif /* USE_PAM */
#ifdef SHADOWGRP
is_shadow_grp = sgr_file_present ();
#endif
/*
* Start with a quick check to see if the group exists.
*/
if (getgrnam (group_name)) {
if (fflg) {
exit (E_SUCCESS);
}
fprintf (stderr, _("%s: group %s exists\n"), Prog, group_name);
exit (E_NAME_IN_USE);
}
/*
* Do the hard stuff - open the files, create the group entries,
* then close and update the files.
*/
open_files ();
if (!gflg || !oflg)
find_new_gid ();
grp_update ();
nscd_flush_cache ("group");
close_files ();
#ifdef USE_PAM
if (retval == PAM_SUCCESS) {
retval = pam_chauthtok (pamh, 0);
if (retval != PAM_SUCCESS) {
pam_end (pamh, retval);
}
}
if (retval != PAM_SUCCESS) {
fprintf (stderr, _("%s: PAM chauthtok failed\n"), Prog);
exit (1);
}
if (retval == PAM_SUCCESS)
pam_end (pamh, PAM_SUCCESS);
#endif /* USE_PAM */
exit (E_SUCCESS);
/* NOT REACHED */
}