The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch up to that fact and revert to their recommended match of BSD-2-Clause. Discussed with: pfg MFC After: 3 days Sponsored by: Netflix
194 lines
4.8 KiB
C
194 lines
4.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
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* Copyright (c) 2008 Bjoern A. Zeeb <bz@FreeBSD.org>
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR 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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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/jail.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <err.h>
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#include <errno.h>
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#include <jail.h>
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#include <limits.h>
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#include <login_cap.h>
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#include <paths.h>
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#include <pwd.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 <unistd.h>
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extern char **environ;
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static void get_user_info(const char *username, const struct passwd **pwdp,
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login_cap_t **lcapp);
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static void usage(void);
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int
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main(int argc, char *argv[])
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{
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int jid;
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login_cap_t *lcap = NULL;
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int ch, clean, uflag, Uflag;
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char *cleanenv;
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const struct passwd *pwd = NULL;
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const char *username, *shell, *term;
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ch = clean = uflag = Uflag = 0;
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username = NULL;
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while ((ch = getopt(argc, argv, "lnu:U:")) != -1) {
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switch (ch) {
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case 'l':
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clean = 1;
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break;
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case 'n':
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/* Specified name, now unused */
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break;
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case 'u':
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username = optarg;
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uflag = 1;
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break;
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case 'U':
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username = optarg;
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Uflag = 1;
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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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argc -= optind;
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argv += optind;
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if (argc < 1)
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usage();
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if (uflag && Uflag)
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usage();
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if (uflag || (clean && !Uflag))
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/* User info from the home environment */
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get_user_info(username, &pwd, &lcap);
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/* Attach to the jail */
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jid = jail_getid(argv[0]);
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if (jid < 0)
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errx(1, "%s", jail_errmsg);
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if (jail_attach(jid) == -1)
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err(1, "jail_attach(%d)", jid);
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if (chdir("/") == -1)
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err(1, "chdir(): /");
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/* Set up user environment */
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if (clean || username != NULL) {
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if (Uflag)
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/* User info from the jail environment */
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get_user_info(username, &pwd, &lcap);
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if (clean) {
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term = getenv("TERM");
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cleanenv = NULL;
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environ = &cleanenv;
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setenv("PATH", "/bin:/usr/bin", 1);
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if (term != NULL)
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setenv("TERM", term, 1);
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}
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if (setgid(pwd->pw_gid) != 0)
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err(1, "setgid");
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if (setusercontext(lcap, pwd, pwd->pw_uid, username
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? LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN
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: LOGIN_SETPATH | LOGIN_SETENV) != 0)
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err(1, "setusercontext");
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login_close(lcap);
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setenv("USER", pwd->pw_name, 1);
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setenv("HOME", pwd->pw_dir, 1);
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setenv("SHELL",
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*pwd->pw_shell ? pwd->pw_shell : _PATH_BSHELL, 1);
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if (clean && chdir(pwd->pw_dir) < 0)
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err(1, "chdir: %s", pwd->pw_dir);
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endpwent();
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}
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/* Run the specified command, or the shell */
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if (argc > 1) {
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if (execvp(argv[1], argv + 1) < 0)
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err(1, "execvp: %s", argv[1]);
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} else {
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if (!(shell = getenv("SHELL")))
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shell = _PATH_BSHELL;
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if (execlp(shell, shell, "-i", NULL) < 0)
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err(1, "execlp: %s", shell);
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}
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exit(0);
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}
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static void
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get_user_info(const char *username, const struct passwd **pwdp,
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login_cap_t **lcapp)
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{
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uid_t uid;
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const struct passwd *pwd;
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errno = 0;
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if (username) {
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pwd = getpwnam(username);
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if (pwd == NULL) {
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if (errno)
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err(1, "getpwnam: %s", username);
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else
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errx(1, "%s: no such user", username);
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}
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} else {
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uid = getuid();
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pwd = getpwuid(uid);
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if (pwd == NULL) {
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if (errno)
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err(1, "getpwuid: %d", uid);
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else
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errx(1, "unknown uid: %d", uid);
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}
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}
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*pwdp = pwd;
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*lcapp = login_getpwclass(pwd);
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if (*lcapp == NULL)
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err(1, "getpwclass: %s", pwd->pw_name);
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if (initgroups(pwd->pw_name, pwd->pw_gid) < 0)
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err(1, "initgroups: %s", pwd->pw_name);
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}
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static void
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usage(void)
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{
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fprintf(stderr, "%s\n",
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"usage: jexec [-l] [-u username | -U username] jail [command ...]");
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exit(1);
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}
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