shadow/src/groupmems.c

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/*
* Copyright (c) 2000 , International Business Machines
* George Kraft IV, gk4@us.ibm.com, 03/23/2000
* Copyright (c) 2000 - 2006, Tomasz Kłoczko
* Copyright (c) 2007 - 2008, 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>
#include <fcntl.h>
#include <getopt.h>
#include <grp.h>
#include <stdio.h>
#include <sys/types.h>
#ifdef USE_PAM
#include "pam_defs.h"
#endif /* USE_PAM */
#include <pwd.h>
#include "defines.h"
#include "prototypes.h"
#include "groupio.h"
/* Exit Status Values */
#define EXIT_SUCCESS 0 /* success */
#define EXIT_USAGE 1 /* invalid command syntax */
#define EXIT_GROUP_FILE 2 /* group file access problems */
#define EXIT_NOT_ROOT 3 /* not superuser */
#define EXIT_NOT_EROOT 4 /* not effective superuser */
#define EXIT_NOT_PRIMARY 5 /* not primary owner of group */
#define EXIT_NOT_MEMBER 6 /* member of group does not exist */
#define EXIT_MEMBER_EXISTS 7 /* member of group already exists */
#define EXIT_INVALID_USER 8 /* specified user does not exist */
#define EXIT_INVALID_GROUP 9 /* specified group does not exist */
/*
* Global variables
*/
static char *adduser = NULL;
static char *deluser = NULL;
static char *thisgroup = NULL;
static bool purge = false;
static bool list = false;
static int exclusive = 0;
static char *Prog;
static bool group_locked = false;
static char *whoami (void);
static void members (char **members);
static void usage (void);
static void process_flags (int argc, char **argv);
static void check_perms (void);
static void fail_exit (int code);
#define isroot() (getuid () == 0)
static char *whoami (void)
{
* 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.
2007-11-19 04:45:26 +05:30
/* local, no need for xgetgrgid */
struct group *grp = getgrgid (getgid ());
* 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.
2007-11-19 04:45:26 +05:30
/* local, no need for xgetpwuid */
struct passwd *usr = getpwuid (getuid ());
if (0 == strcmp (usr->pw_name, grp->gr_name)) {
return strdup (usr->pw_name);
} else {
return NULL;
}
}
static void members (char **members)
{
int i;
for (i = 0; NULL != members[i]; i++) {
printf ("%s ", members[i]);
if (NULL == members[i + 1]) {
printf ("\n");
} else {
printf (" ");
}
}
}
static void usage (void)
{
fputs (_("Usage: groupmems -a username | -d username | -D | -l [-g groupname]\n"), stderr);
fail_exit (EXIT_USAGE);
}
/*
* process_flags - perform command line argument setting
*/
static void process_flags (int argc, char **argv)
{
int arg;
int option_index = 0;
static struct option long_options[] = {
{"add", required_argument, NULL, 'a'},
{"delete", required_argument, NULL, 'd'},
{"group", required_argument, NULL, 'g'},
{"list", no_argument, NULL, 'l'},
{"purge", no_argument, NULL, 'p'},
{NULL, 0, NULL, '\0'}
};
while ((arg = getopt_long (argc, argv, "a:d:g:lp", long_options,
&option_index)) != EOF) {
switch (arg) {
case 'a':
adduser = strdup (optarg);
++exclusive;
break;
case 'd':
deluser = strdup (optarg);
++exclusive;
break;
case 'p':
purge = true;
++exclusive;
break;
case 'g':
thisgroup = strdup (optarg);
break;
case 'l':
list = true;
++exclusive;
break;
default:
usage ();
}
}
if ((exclusive > 1) || (optind < argc)) {
usage ();
}
/* local, no need for xgetpwnam */
if (getpwnam (adduser) == NULL) {
fprintf (stderr, _("%s: user `%s' does not exist\n"),
Prog, adduser);
fail_exit (EXIT_INVALID_USER);
}
}
static void check_perms (void)
{
#ifdef USE_PAM
pam_handle_t *pamh = NULL;
int retval = PAM_SUCCESS;
struct passwd *pampw;
pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
if (NULL == pampw) {
retval = PAM_USER_UNKNOWN;
}
if (PAM_SUCCESS == retval) {
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);
}
(void) pam_end (pamh, retval);
if (PAM_SUCCESS != retval) {
fprintf (stderr, _("%s: PAM authentication failed\n"), Prog);
fail_exit (1);
}
#endif
}
static void fail_exit (int code)
{
if (group_locked) {
if (gr_unlock () == 0) {
fprintf (stderr,
_("%s: unable to unlock group file\n"),
Prog);
}
}
exit (code);
}
void main (int argc, char **argv)
{
char *name;
struct group *grp;
/*
* 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);
if (NULL == thisgroup) {
name = whoami ();
if (!list && (NULL == name)) {
fprintf (stderr, _("%s: your groupname does not match your username\n"), Prog);
fail_exit (EXIT_NOT_PRIMARY);
}
} else {
name = thisgroup;
if (!list && !isroot ()) {
fprintf (stderr, _("%s: only root can use the -g/--group option\n"), Prog);
fail_exit (EXIT_NOT_ROOT);
}
}
if (!list) {
check_perms ();
if (gr_lock () == 0) {
fprintf (stderr,
_("%s: unable to lock group file\n"), Prog);
fail_exit (EXIT_GROUP_FILE);
}
group_locked = true;
}
if (gr_open (list ? O_RDONLY : O_RDWR) == 0) {
fprintf (stderr, _("%s: unable to open group file\n"), Prog);
fail_exit (EXIT_GROUP_FILE);
}
grp = (struct group *) gr_locate (name);
if (NULL == grp) {
fprintf (stderr, _("%s: `%s' not found in /etc/group\n"),
Prog, name);
fail_exit (EXIT_INVALID_GROUP);
}
if (list) {
members (grp->gr_mem);
} else if (NULL != adduser) {
if (is_on_list (grp->gr_mem, adduser)) {
fprintf (stderr,
_("%s: user `%s' is already a member of `%s'\n"),
Prog, adduser, grp->gr_name);
fail_exit (EXIT_MEMBER_EXISTS);
}
grp->gr_mem = add_list (grp->gr_mem, adduser);
gr_update (grp);
} else if (NULL != deluser) {
if (!is_on_list (grp->gr_mem, adduser)) {
fprintf (stderr,
_("%s: user `%s' is not a member of `%s'\n"),
Prog, deluser, grp->gr_name);
fail_exit (EXIT_NOT_MEMBER);
}
grp->gr_mem = del_list (grp->gr_mem, deluser);
gr_update (grp);
} else if (purge) {
grp->gr_mem[0] = NULL;
gr_update (grp);
}
if (gr_close () == 0) {
fprintf (stderr, _("%s: unable to close group file\n"), Prog);
fail_exit (EXIT_GROUP_FILE);
}
fail_exit (EXIT_SUCCESS);
}