minix/usr.bin/newgrp/newgrp.c

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/*-
* Copyright (c) 2007 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Brian Ginsbach.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: newgrp.c,v 1.7 2011/09/16 15:39:27 joerg Exp $");
#endif /* not lint */
#include <sys/param.h>
#include <sys/types.h>
#include <err.h>
#include <grp.h>
#include <libgen.h>
#include <paths.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef LOGIN_CAP
#include <login_cap.h>
#endif
#include "grutil.h"
__dead static void
usage(void)
{
(void)fprintf(stderr, "usage: %s [-l] [group]\n", getprogname());
exit(EXIT_FAILURE);
}
int
main(int argc, char *argv[])
{
extern char **environ;
struct passwd *pwd;
int c, lflag;
char *shell, sbuf[MAXPATHLEN + 2];
uid_t uid;
#ifdef LOGIN_CAP
login_cap_t *lc;
u_int flags = LOGIN_SETUSER;
#endif
uid = getuid();
pwd = getpwuid(uid);
if (pwd == NULL)
errx(EXIT_FAILURE, "who are you?");
#ifdef LOGIN_CAP
if ((lc = login_getclass(pwd->pw_class)) == NULL)
errx(EXIT_FAILURE, "%s: unknown login class", pwd->pw_class);
#endif
(void)setprogname(argv[0]);
lflag = 0;
while ((c = getopt(argc, argv, "-l")) != -1) {
switch (c) {
case '-':
case 'l':
if (lflag)
usage();
lflag = 1;
break;
default:
usage();
break;
}
}
argc -= optind;
argv += optind;
if (argc > 0) {
#if 0
pwd->pw_gid = newgrp(*argv, pwd);
addgrp(pwd->pw_gid);
if (setgid(pwd->pw_gid) < 0)
err(1, "setgid");
#endif
#ifdef LOGIN_CAP
addgroup(lc, *argv, pwd, getuid(), "Password:");
#else
addgroup(*argv, pwd, getuid(), "Password:");
#endif
} else {
#ifdef LOGIN_CAP
flags |= LOGIN_SETGROUP;
#else
if (initgroups(pwd->pw_name, pwd->pw_gid) == -1)
err(EXIT_FAILURE, "initgroups");
if (setgid(pwd->pw_gid) == -1)
err(EXIT_FAILURE, "setgid");
#endif
}
#ifdef LOGIN_CAP
if (setusercontext(lc, pwd, uid, flags) == -1)
err(EXIT_FAILURE, "setusercontext");
if (!lflag)
login_close(lc);
#else
if (setuid(pwd->pw_uid) == -1)
err(EXIT_FAILURE, "setuid");
#endif
if (*pwd->pw_shell == '\0') {
#ifdef TRUST_ENV_SHELL
shell = getenv("SHELL");
if (shell != NULL)
pwd->pw_shell = shell;
else
#endif
pwd->pw_shell = __UNCONST(_PATH_BSHELL);
}
shell = pwd->pw_shell;
if (lflag) {
char *term;
#ifdef KERBEROS
char *krbtkfile;
#endif
if (chdir(pwd->pw_dir) == -1)
warn("%s", pwd->pw_dir);
term = getenv("TERM");
#ifdef KERBEROS
krbtkfile = getenv("KRBTKFILE");
#endif
/* create an empty environment */
if ((environ = malloc(sizeof(char *))) == NULL)
err(EXIT_FAILURE, NULL);
environ[0] = NULL;
#ifdef LOGIN_CAP
if (setusercontext(lc, pwd, uid, LOGIN_SETENV | LOGIN_SETPATH) == -1)
err(EXIT_FAILURE, "setusercontext");
login_close(lc);
#else
(void)setenv("PATH", _PATH_DEFPATH, 1);
#endif
if (term != NULL)
(void)setenv("TERM", term, 1);
#ifdef KERBEROS
if (krbtkfile != NULL)
(void)setenv("KRBTKFILE", krbtkfile, 1);
#endif
(void)setenv("LOGNAME", pwd->pw_name, 1);
(void)setenv("USER", pwd->pw_name, 1);
(void)setenv("HOME", pwd->pw_dir, 1);
(void)setenv("SHELL", pwd->pw_shell, 1);
sbuf[0] = '-';
(void)strlcpy(sbuf + 1, basename(pwd->pw_shell),
sizeof(sbuf) - 1);
shell = sbuf;
}
(void)execl(pwd->pw_shell, shell, NULL);
err(EXIT_FAILURE, "%s", pwd->pw_shell);
/* NOTREACHED */
}