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141 lines
3.7 KiB
C
141 lines
3.7 KiB
C
/*-
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <pwd.h>
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#include <unistd.h>
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static void usage(void);
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#define GET_USER_INFO do { \
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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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lcap = login_getpwclass(pwd); \
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if (lcap == NULL) \
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err(1, "getpwclass: %s", username); \
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ngroups = ngroups_max; \
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if (getgrouplist(username, pwd->pw_gid, groups, &ngroups) != 0) \
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err(1, "getgrouplist: %s", username); \
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} while (0)
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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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struct passwd *pwd = NULL;
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gid_t *groups = NULL;
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int ch, ngroups, uflag, Uflag;
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long ngroups_max;
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char *username;
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ch = uflag = Uflag = 0;
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username = NULL;
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ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1;
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if ((groups = malloc(sizeof(gid_t) * ngroups_max)) == NULL)
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err(1, "malloc");
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while ((ch = getopt(argc, argv, "nu:U:")) != -1) {
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switch (ch) {
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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 < 2)
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usage();
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if (uflag && Uflag)
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usage();
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if (uflag)
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GET_USER_INFO;
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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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if (username != NULL) {
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if (Uflag)
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GET_USER_INFO;
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if (setgroups(ngroups, groups) != 0)
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err(1, "setgroups");
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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,
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LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN) != 0)
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err(1, "setusercontext");
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login_close(lcap);
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}
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if (execvp(argv[1], argv + 1) == -1)
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err(1, "execvp(): %s", argv[1]);
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exit(0);
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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 [-u username | -U username] jail command ...");
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exit(1);
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}
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