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>
#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 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 find_new_gid (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)
{
fprintf (stderr, _("Usage: groupadd [options] GROUP\n"
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"\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"
"\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;
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) {
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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,
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group_id, 1);
#endif
SYSLOG ((LOG_INFO, "new group: name=%s, GID=%u",
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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.
*/
static void find_new_gid (void)
{
const struct group *grp;
gid_t gid_min, gid_max;
/*
* It doesn't make sense to use find_new_gid(),
* if a GID is specified via "-g" option.
*/
assert (!gflg);
gid_min = getdef_unum ("GID_MIN", 1000);
gid_max = getdef_unum ("GID_MAX", 60000);
/*
* Start with the lowest GID.
*/
group_id = gid_min;
/*
* Search the entire group file, looking for the largest unused
* value.
*/
setgrent ();
while ((grp = getgrent ())) {
if ((grp->gr_gid >= group_id) && (grp->gr_gid <= gid_max)) {
group_id = grp->gr_gid + 1;
}
}
if (group_id == (gid_max + 1)) {
for (group_id = gid_min; group_id < gid_max; group_id++) {
* lib/prototypes.h, configure.in, libmisc/Makefile.am, libmisc/xgetXXbyYY.c, libmisc/xgetpwnam.c, libmisc/xgetpwuid.c, libmisc/xgetgrnam.c, libmisc/xgetgrgid.c, libmisc/xgetspnam.c: Added functions xgetpwnam(), xgetpwuid(), xgetgrnam(), xgetgrgid(), and xgetspnam(). They allocate memory for the returned structure and are more robust to successive calls. They are implemented with the libc's getxxyyy_r() functions if available. * libmisc/limits.c, libmisc/entry.c, libmisc/chowntty.c, libmisc/addgrps.c, libmisc/myname.c, libmisc/rlogin.c, libmisc/pwdcheck.c, src/newgrp.c, src/login_nopam.c, src/userdel.c, src/lastlog.c, src/grpck.c, src/gpasswd.c, src/newusers.c, src/chpasswd.c, src/chfn.c, src/groupmems.c, src/usermod.c, src/expiry.c, src/groupdel.c, src/chgpasswd.c, src/su.c, src/useradd.c, src/groupmod.c, src/passwd.c, src/pwck.c, src/groupadd.c, src/chage.c, src/login.c, src/suauth.c, src/faillog.c, src/groups.c, src/chsh.c, src/id.c: Review all the usage of one of the getpwnam(), getpwuid(), getgrnam(), getgrgid(), and getspnam() functions. It was noticed on http://bugs.debian.org/341230 that chfn and chsh use a passwd structure after calling a pam function, which result in using information from the passwd structure requested by pam, not the original one. It is much easier to use the new xget... functions to avoid these issues. I've checked which call to the original get... functions could be left (reducing the scope of the structure if possible), and I've left comments to ease future reviews (e.g. /* local, no need for xgetpwnam */). Note: the getpwent/getgrent calls should probably be checked also. * src/groupdel.c, src/expiry.c: Fix typos in comments. * src/groupmod.c: Re-indent. * libmisc/Makefile.am, lib/groupmem.c, lib/groupio.c, lib/pwmem.c, lib/pwio.c, lib/shadowmem.c, lib/shadowio.c: Move the __<xx>_dup functions (used by the xget... functions) from the <xx>io.c files to the new <xx>mem.c files. This avoid linking some utils against the SELinux library.
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/* local, no need for xgetgrgid */
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if (!getgrgid (group_id)) {
break;
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}
}
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)
{
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if (check_group_name (group_name)) {
return;
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}
/*
* All invalid group names land here.
*/
fprintf (stderr, _("%s: %s is not a valid group name\n"),
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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,
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_("%s: cannot rewrite shadow group file\n"), Prog);
fail_exit (E_GRP_UPDATE);
}
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if (is_shadow_grp) {
sgr_unlock ();
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}
#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",
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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",
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group_name, -1, 0);
#endif
fail_exit (E_GRP_UPDATE);
}
#ifdef SHADOWGRP
if (is_shadow_grp && !sgr_lock ()) {
fprintf (stderr,
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_("%s: unable to lock shadow group file\n"), Prog);
fail_exit (E_GRP_UPDATE);
}
if (is_shadow_grp && !sgr_open (O_RDWR)) {
fprintf (stderr,
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_("%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
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if (is_shadow_grp) {
sgr_unlock ();
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}
#endif
#ifdef WITH_AUDIT
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if (code != E_SUCCESS) {
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "adding group",
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group_name, -1, 0);
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}
#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);
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if (('\0' != *errptr) || (errno == ERANGE) || (val < 0)) {
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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'},
{NULL, 0, NULL, '\0'}
};
while ((c =
getopt_long (argc, argv, "fg:hK:o", long_options,
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&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,
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_
("%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':
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pflg++;
group_passwd = optarg;
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) {
find_new_gid ();
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}
grp_update ();
close_files ();
nscd_flush_cache ("group");
#ifdef USE_PAM
pam_end (pamh, PAM_SUCCESS);
#endif /* USE_PAM */
exit (E_SUCCESS);
/* NOT REACHED */
}
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