312 lines
7.0 KiB
C
312 lines
7.0 KiB
C
/*
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* Copyright 2000, International Business Machines
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* George Kraft IV, gk4@us.ibm.com, 03/23/2000
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <config.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <grp.h>
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#include <stdio.h>
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#include <sys/types.h>
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#ifdef USE_PAM
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#include "pam_defs.h"
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#endif /* USE_PAM */
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#include <pwd.h>
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#include "defines.h"
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#include "groupio.h"
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/* Exit Status Values */
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#define EXIT_SUCCESS 0 /* success */
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#define EXIT_USAGE 1 /* invalid command syntax */
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#define EXIT_GROUP_FILE 2 /* group file access problems */
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#define EXIT_NOT_ROOT 3 /* not superuser */
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#define EXIT_NOT_EROOT 4 /* not effective superuser */
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#define EXIT_NOT_PRIMARY 5 /* not primary owner of group */
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#define EXIT_NOT_MEMBER 6 /* member of group does not exist */
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#define EXIT_MEMBER_EXISTS 7 /* member of group already exists */
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#define TRUE 1
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#define FALSE 0
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/*
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* Global variables
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*/
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static char *adduser = NULL;
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static char *deluser = NULL;
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static char *thisgroup = NULL;
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static int purge = FALSE;
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static int list = FALSE;
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static int exclusive = 0;
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static int isroot (void)
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{
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return getuid ()? FALSE : TRUE;
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}
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static int isgroup (void)
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{
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gid_t g = getgid ();
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struct group *grp = getgrgid (g); /* local, no need for xgetgrgid */
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return TRUE;
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}
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static char *whoami (void)
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{
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/* local, no need for xgetgrgid */
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struct group *grp = getgrgid (getgid ());
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/* local, no need for xgetpwuid */
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struct passwd *usr = getpwuid (getuid ());
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if (0 == strcmp (usr->pw_name, grp->gr_name)) {
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return (char *) strdup (usr->pw_name);
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} else {
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return NULL;
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}
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}
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static void addtogroup (char *user, char **members)
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{
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int i;
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for (i = 0; NULL != members[i]; i++) {
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if (0 == strcmp (user, members[i])) {
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fputs (_("Member already exists\n"), stderr);
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exit (EXIT_MEMBER_EXISTS);
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}
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}
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members = (char **) realloc (members, sizeof (char *) * i);
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members[i] = user;
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members[i + 1] = NULL;
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}
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static void rmfromgroup (char *user, char **members)
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{
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int i;
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int found = FALSE;
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i = 0;
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while (!found && NULL != members[i]) {
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if (0 == strcmp (user, members[i])) {
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found = TRUE;
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} else {
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i++;
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}
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}
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while (found && NULL != members[i]) {
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members[i] = members[i+1];
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i++;
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}
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if (!found) {
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fputs (_("Member to remove could not be found\n"), stderr);
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exit (EXIT_NOT_MEMBER);
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}
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}
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static void nomembers (char **members)
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{
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int i;
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for (i = 0; NULL != members[i]; i++) {
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members[i] = NULL;
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}
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}
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static void members (char **members)
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{
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int i;
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for (i = 0; NULL != members[i]; i++) {
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printf ("%s ", members[i]);
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if (NULL == members[i + 1]) {
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printf ("\n");
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} else {
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printf (" ");
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}
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}
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}
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static void usage (void)
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{
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fputs (_("Usage: groupmems -a username | -d username | -D | -l [-g groupname]\n"), stderr);
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exit (EXIT_USAGE);
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}
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int main (int argc, char **argv)
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{
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int arg;
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char *name;
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struct group *grp;
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#ifdef USE_PAM
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pam_handle_t *pamh = NULL;
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int retval;
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#endif
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setlocale (LC_ALL, "");
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bindtextdomain (PACKAGE, LOCALEDIR);
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textdomain (PACKAGE);
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int option_index = 0;
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static struct option long_options[] = {
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{"add", required_argument, NULL, 'a'},
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{"delete", required_argument, NULL, 'd'},
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{"group", required_argument, NULL, 'g'},
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{"list", no_argument, NULL, 'l'},
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{"purge", no_argument, NULL, 'p'},
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{NULL, 0, NULL, '\0'}
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};
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while ((arg =
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getopt_long (argc, argv, "a:d:g:lp", long_options,
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&option_index)) != EOF) {
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switch (arg) {
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case 'a':
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adduser = strdup (optarg);
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++exclusive;
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break;
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case 'd':
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deluser = strdup (optarg);
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++exclusive;
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break;
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case 'p':
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purge = TRUE;
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++exclusive;
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break;
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case 'g':
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thisgroup = strdup (optarg);
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break;
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case 'l':
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list = TRUE;
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++exclusive;
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break;
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default:
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usage ();
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}
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}
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if (exclusive > 1 || optind < argc) {
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usage ();
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}
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if (!isroot () && NULL != thisgroup) {
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fputs (_("Only root can add members to different groups\n"),
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stderr);
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exit (EXIT_NOT_ROOT);
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} else if (isroot () && NULL != thisgroup) {
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name = thisgroup;
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} else if (!isgroup ()) {
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fputs (_("Group access is required\n"), stderr);
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exit (EXIT_NOT_EROOT);
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} else if (NULL == (name = whoami ())) {
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fputs (_("Not primary owner of current group\n"), stderr);
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exit (EXIT_NOT_PRIMARY);
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}
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#ifdef USE_PAM
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retval = PAM_SUCCESS;
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{
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struct passwd *pampw;
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pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
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if (pampw == NULL) {
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retval = PAM_USER_UNKNOWN;
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}
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if (retval == PAM_SUCCESS) {
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retval = pam_start ("groupmod", pampw->pw_name,
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&conv, &pamh);
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}
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}
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if (retval == PAM_SUCCESS) {
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retval = pam_authenticate (pamh, 0);
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if (retval != PAM_SUCCESS) {
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pam_end (pamh, retval);
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}
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}
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if (retval == PAM_SUCCESS) {
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retval = pam_acct_mgmt (pamh, 0);
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if (retval != PAM_SUCCESS) {
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pam_end (pamh, retval);
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}
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}
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if (retval != PAM_SUCCESS) {
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fputs (_("PAM authentication failed for\n"), stderr);
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exit (1);
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}
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#endif
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if (!gr_lock ()) {
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fputs (_("Unable to lock group file\n"), stderr);
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exit (EXIT_GROUP_FILE);
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}
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if (!gr_open (O_RDWR)) {
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fputs (_("Unable to open group file\n"), stderr);
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exit (EXIT_GROUP_FILE);
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}
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grp = (struct group *) gr_locate (name);
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if (NULL != adduser) {
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addtogroup (adduser, grp->gr_mem);
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gr_update (grp);
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} else if (NULL != deluser) {
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rmfromgroup (deluser, grp->gr_mem);
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gr_update (grp);
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} else if (purge) {
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nomembers (grp->gr_mem);
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gr_update (grp);
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} else if (list) {
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members (grp->gr_mem);
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}
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if (!gr_close ()) {
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fputs (_("Cannot close group file\n"), stderr);
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exit (EXIT_GROUP_FILE);
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}
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gr_unlock ();
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#ifdef USE_PAM
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if (retval == PAM_SUCCESS) {
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pam_end (pamh, PAM_SUCCESS);
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}
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#endif /* USE_PAM */
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exit (EXIT_SUCCESS);
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}
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