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172 lines
3.9 KiB
C
172 lines
3.9 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* addgroup - add users to /etc/passwd and /etc/shadow
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*
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* Copyright (C) 1999 by Lineo, inc. and John Beppu
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* Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "busybox.h"
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#include "pwd_.h"
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#include "grp_.h"
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/* structs __________________________ */
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/* data _____________________________ */
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/* defaults : should this be in an external file? */
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static const char default_passwd[] = "x";
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/* make sure gr_name isn't taken, make sure gid is kosher
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* return 1 on failure */
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static int group_study(const char *filename, struct group *g)
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{
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FILE *etc_group;
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gid_t desired;
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struct group *grp;
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const int max = 65000;
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etc_group = bb_xfopen(filename, "r");
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/* make sure gr_name isn't taken, make sure gid is kosher */
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desired = g->gr_gid;
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while ((grp = fgetgrent(etc_group))) {
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if ((strcmp(grp->gr_name, g->gr_name)) == 0) {
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bb_error_msg_and_die("%s: group already in use\n", g->gr_name);
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}
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if ((desired) && grp->gr_gid == desired) {
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bb_error_msg_and_die("%d: gid has already been allocated\n",
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desired);
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}
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if ((grp->gr_gid > g->gr_gid) && (grp->gr_gid < max)) {
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g->gr_gid = grp->gr_gid;
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}
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}
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fclose(etc_group);
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/* gid */
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if (desired) {
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g->gr_gid = desired;
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} else {
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g->gr_gid++;
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}
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/* return 1; */
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return 0;
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}
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/* append a new user to the passwd file */
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static int addgroup(const char *filename, char *group, gid_t gid, const char *user)
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{
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FILE *etc_group;
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#ifdef CONFIG_FEATURE_SHADOWPASSWDS
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FILE *etc_gshadow;
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#endif
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struct group gr;
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/* group:passwd:gid:userlist */
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static const char entryfmt[] = "%s:%s:%d:%s\n";
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/* make sure gid and group haven't already been allocated */
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gr.gr_gid = gid;
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gr.gr_name = group;
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if (group_study(filename, &gr))
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return 1;
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/* add entry to group */
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etc_group = bb_xfopen(filename, "a");
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fprintf(etc_group, entryfmt, group, default_passwd, gr.gr_gid, user);
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fclose(etc_group);
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#ifdef CONFIG_FEATURE_SHADOWPASSWDS
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/* add entry to gshadow if necessary */
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if (access(bb_path_gshadow_file, F_OK|W_OK) == 0) {
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etc_gshadow = bb_xfopen(bb_path_gshadow_file, "a");
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fprintf(etc_gshadow, "%s:!::\n", group);
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fclose(etc_gshadow);
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}
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#endif
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/* return 1; */
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return 0;
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}
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#ifndef CONFIG_ADDUSER
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static inline void if_i_am_not_root(void)
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{
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if (geteuid()) {
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bb_error_msg_and_die( "Only root may add a user or group to the system.");
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}
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}
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#else
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extern void if_i_am_not_root(void);
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#endif
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/*
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* addgroup will take a login_name as its first parameter.
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*
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* gid
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*
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* can be customized via command-line parameters.
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* ________________________________________________________________________ */
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int addgroup_main(int argc, char **argv)
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{
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char *group;
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char *user;
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gid_t gid = 0;
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/* get remaining args */
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if(bb_getopt_ulflags(argc, argv, "g:", &group)) {
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gid = bb_xgetlarg(group, 10, 0, LONG_MAX);
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}
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if (optind < argc) {
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group = argv[optind];
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optind++;
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} else {
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bb_show_usage();
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}
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if (optind < argc) {
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user = argv[optind];
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} else {
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user = "";
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}
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if_i_am_not_root();
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/* werk */
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return addgroup(bb_path_group_file, group, gid, user);
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}
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