shadow/src/groupadd.c
2008-02-19 21:01:38 +00:00

584 lines
14 KiB
C

/*
* 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>
#ident "$Id$"
#include <assert.h>
#include <ctype.h>
#include <fcntl.h>
#include <getopt.h>
#include <grp.h>
#include <stdio.h>
#include <sys/types.h>
#ifdef USE_PAM
#include "pam_defs.h"
#include <pwd.h>
#endif /* USE_PAM */
#include "chkname.h"
#include "defines.h"
#include "getdef.h"
#include "groupio.h"
#include "nscd.h"
#include "prototypes.h"
#ifdef SHADOWGRP
#include "sgroupio.h"
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 */
/*
* Global variables
*/
static char *group_name;
static gid_t group_id;
static char *group_passwd;
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) */
static int rflg = 0; /* create a system account */
static int pflg = 0; /* new encrypted password */
#ifdef USE_PAM
static pam_handle_t *pamh = NULL;
#endif
/* local function prototypes */
static void usage (void);
static void new_grent (struct group *grent);
#ifdef SHADOWGRP
static void new_sgent (struct sgrp *sgent);
#endif
static void grp_update (void);
static void check_new_name (void);
static void close_files (void);
static void open_files (void);
static void fail_exit (int code);
static gid_t get_gid (const char *gidstr);
static void process_flags (int argc, char **argv);
static void check_flags (void);
static void check_perms (void);
/*
* usage - display usage message and exit
*/
static void usage (void)
{
fputs (_("Usage: groupadd [options] GROUP\n"
"\n"
"Options:\n"
" -f, --force force exit with success status if the\n"
" specified group already exists\n"
" -g, --gid GID use GID for the new group\n"
" -h, --help display this help message and exit\n"
" -K, --key KEY=VALUE overrides /etc/login.defs defaults\n"
" -o, --non-unique allow create group with duplicate\n"
" (non-unique) GID\n"
" -r, --system create a system account\n"
"\n"), stderr);
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;
if (pflg) {
grent->gr_passwd = group_passwd;
} else {
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;
if (pflg) {
sgent->sg_passwd = group_passwd;
} else {
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);
if (is_shadow_grp && pflg) {
grp.gr_passwd = SHADOW_PASSWD_STRING; /* XXX warning: const */
}
#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 */
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "adding group", group_name,
group_id, 1);
#endif
SYSLOG ((LOG_INFO, "new group: name=%s, GID=%u",
group_name, (unsigned int) group_id));
}
/*
* 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);
}
/*
* 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);
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "locking group file",
group_name, -1, 0);
#endif
exit (E_GRP_UPDATE);
}
if (!gr_open (O_RDWR)) {
fprintf (stderr, _("%s: unable to open group file\n"), Prog);
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "opening group file",
group_name, -1, 0);
#endif
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
#ifdef WITH_AUDIT
if (code != E_SUCCESS) {
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "adding group",
group_name, -1, 0);
}
#endif
#ifdef USE_PAM
if (NULL != pamh) {
/* If there is a PAM error, fail_exit is not called.
* We always end the pam transaction with PAM_SUCCESS here.
*/
pam_end (pamh, PAM_SUCCESS);
}
#endif
exit (code);
}
/*
* get_id - validate and get group ID
*/
static gid_t get_gid (const char *gidstr)
{
long val;
char *errptr;
val = strtol (gidstr, &errptr, 10);
if (('\0' != *errptr) || (errno == ERANGE) || (val < 0)) {
fprintf (stderr, _("%s: invalid numeric argument '%s'\n"),
Prog, gidstr);
exit (E_BAD_ARG);
}
return val;
}
/*
* process_flags - parse the command line options
*
* It will not return if an error is encountered.
*/
static void process_flags (int argc, char **argv)
{
/*
* Parse the command line options.
*/
char *cp;
int option_index = 0;
int c;
static struct option long_options[] = {
{"force", no_argument, NULL, 'f'},
{"gid", required_argument, NULL, 'g'},
{"help", no_argument, NULL, 'h'},
{"key", required_argument, NULL, 'K'},
{"non-unique", required_argument, NULL, 'o'},
{"password", required_argument, NULL, 'p'},
{"system", no_argument, NULL, 'r'},
{NULL, 0, NULL, '\0'}
};
while ((c =
getopt_long (argc, argv, "fg:hK:or", long_options,
&option_index)) != -1) {
switch (c) {
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;
case 'g':
gflg++;
group_id = get_gid (optarg);
break;
case 'h':
usage ();
break;
case 'K':
/*
* override login.defs defaults (-K name=value)
* example: -K GID_MIN=100 -K GID_MAX=499
* note: -K GID_MIN=10,GID_MAX=499 doesn't work yet
*/
cp = strchr (optarg, '=');
if (NULL == cp) {
fprintf (stderr,
_
("%s: -K requires KEY=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 'o':
oflg++;
break;
case 'p':
pflg++;
group_passwd = optarg;
break;
case 'r':
rflg++;
break;
default:
usage ();
}
}
/*
* Check the flags consistency
*/
if (optind != argc - 1) {
usage ();
}
group_name = argv[optind];
check_flags ();
}
/*
* check_flags - check flags and parameters consistency
*
* It will not return if an error is encountered.
*/
static void check_flags (void)
{
/* -o does not make sense without -g */
if (oflg && !gflg) {
usage ();
}
check_new_name ();
/*
* Check if the group already exist.
*/
/* local, no need for xgetgrnam */
if (getgrnam (group_name) != NULL) {
/* The group already exist */
if (fflg) {
/* OK, no need to do anything */
fail_exit (E_SUCCESS);
}
fprintf (stderr, _("%s: group %s exists\n"), Prog, group_name);
fail_exit (E_NAME_IN_USE);
}
if (gflg && (getgrgid (group_id) != NULL)) {
/* A GID was specified, and a group already exist with that GID
* - either we will use this GID anyway (-o)
* - either we ignore the specified GID and
* we will use another one(-f)
* - either it is a failure
*/
if (oflg) {
/* Continue with this GID */
} else if (fflg) {
/* Turn off -g, we can use any GID */
gflg = 0;
} else {
fprintf (stderr, _("%s: GID %u is not unique\n"),
Prog, (unsigned int) group_id);
fail_exit (E_GID_IN_USE);
}
}
}
/*
* check_perms - check if the caller is allowed to add a group
*
* With PAM support, the setuid bit can be set on groupadd to allow
* non-root users to groups.
* Without PAM support, only users who can write in the group databases
* can add groups.
*
* It will not return if the user is not allowed.
*/
static void check_perms (void)
{
#ifdef USE_PAM
int retval = PAM_SUCCESS;
struct passwd *pampw;
pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
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);
}
#endif /* USE_PAM */
}
/*
* main - groupadd command
*/
int main (int argc, char **argv)
{
#ifdef WITH_AUDIT
audit_help_open ();
#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");
/*
* Parse the command line options.
*/
process_flags (argc, argv);
check_perms ();
#ifdef SHADOWGRP
is_shadow_grp = sgr_file_present ();
#endif
/*
* Do the hard stuff - open the files, create the group entries,
* then close and update the files.
*/
open_files ();
if (!gflg) {
if (find_new_gid (rflg, &group_id, NULL) < 0) {
fprintf (stderr, _("%s: can't create group\n"), Prog);
fail_exit (E_GID_IN_USE);
}
}
grp_update ();
close_files ();
nscd_flush_cache ("group");
#ifdef USE_PAM
pam_end (pamh, PAM_SUCCESS);
#endif /* USE_PAM */
exit (E_SUCCESS);
/* NOT REACHED */
}