Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
297 lines
7.0 KiB
C
297 lines
7.0 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/sysctl.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 <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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#ifdef SUPPORT_OLD_XPRISON
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static
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char *lookup_xprison_v1(void *p, char *end, int *id)
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{
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struct xprison_v1 *xp;
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if (id == NULL)
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errx(1, "Internal error. Invalid ID pointer.");
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if ((char *)p + sizeof(struct xprison_v1) > end)
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errx(1, "Invalid length for jail");
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xp = (struct xprison_v1 *)p;
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*id = xp->pr_id;
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return ((char *)(xp + 1));
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}
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#endif
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static
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char *lookup_xprison_v3(void *p, char *end, int *id, char *jailname)
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{
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struct xprison *xp;
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char *q;
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int ok;
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if (id == NULL)
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errx(1, "Internal error. Invalid ID pointer.");
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if ((char *)p + sizeof(struct xprison) > end)
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errx(1, "Invalid length for jail");
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xp = (struct xprison *)p;
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ok = 1;
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/* Jail state and name. */
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if (xp->pr_state < 0 || xp->pr_state >
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(int)((sizeof(prison_states) / sizeof(struct prison_state))))
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errx(1, "Invalid jail state.");
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else if (xp->pr_state != PRISON_STATE_ALIVE)
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ok = 0;
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if (jailname != NULL) {
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if (xp->pr_name == NULL)
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ok = 0;
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else if (strcmp(jailname, xp->pr_name) != 0)
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ok = 0;
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}
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q = (char *)(xp + 1);
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/* IPv4 addresses. */
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q += (xp->pr_ip4s * sizeof(struct in_addr));
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if ((char *)q > end)
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errx(1, "Invalid length for jail");
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/* IPv6 addresses. */
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q += (xp->pr_ip6s * sizeof(struct in6_addr));
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if ((char *)q > end)
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errx(1, "Invalid length for jail");
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if (ok)
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*id = xp->pr_id;
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return (q);
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}
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static int
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lookup_jail(int jid, char *jailname)
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{
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size_t i, j, len;
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void *p, *q;
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int version, id, xid, count;
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if (sysctlbyname("security.jail.list", NULL, &len, NULL, 0) == -1)
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err(1, "sysctlbyname(): security.jail.list");
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j = len;
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for (i = 0; i < 4; i++) {
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if (len <= 0)
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exit(0);
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p = q = malloc(len);
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if (p == NULL)
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err(1, "malloc()");
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if (sysctlbyname("security.jail.list", q, &len, NULL, 0) == -1) {
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if (errno == ENOMEM) {
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free(p);
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p = NULL;
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len += j;
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continue;
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}
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err(1, "sysctlbyname(): security.jail.list");
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}
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break;
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}
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if (p == NULL)
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err(1, "sysctlbyname(): security.jail.list");
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if (len < sizeof(int))
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errx(1, "This is no prison. Kernel and userland out of sync?");
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version = *(int *)p;
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if (version > XPRISON_VERSION)
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errx(1, "Sci-Fi prison. Kernel/userland out of sync?");
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count = 0;
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xid = -1;
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for (; q != NULL && (char *)q + sizeof(int) < (char *)p + len;) {
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version = *(int *)q;
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if (version > XPRISON_VERSION)
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errx(1, "Sci-Fi prison. Kernel/userland out of sync?");
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id = -1;
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switch (version) {
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#ifdef SUPPORT_OLD_XPRISON
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case 1:
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if (jailname != NULL)
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errx(1, "Version 1 prisons did not "
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"support jail names.");
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q = lookup_xprison_v1(q, (char *)p + len, &id);
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break;
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case 2:
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errx(1, "Version 2 was used by multi-IPv4 jail "
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"implementations that never made it into the "
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"official kernel.");
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/* NOTREACHED */
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break;
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#endif
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case 3:
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q = lookup_xprison_v3(q, (char *)p + len, &id, jailname);
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break;
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default:
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errx(1, "Prison unknown. Kernel/userland out of sync?");
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/* NOTREACHED */
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break;
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}
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/* Possible match. */
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if (id > 0) {
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/* Do we have a jail ID to match as well? */
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if (jid > 0) {
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if (jid == id) {
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xid = id;
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count++;
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}
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} else {
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xid = id;
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count++;
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}
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}
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}
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free(p);
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if (count != 1)
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errx(1, "Could not uniquely identify the jail.");
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return (xid);
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}
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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; \
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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[NGROUPS];
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int ch, ngroups, uflag, Uflag;
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char *jailname, *username;
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ch = uflag = Uflag = 0;
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jailname = username = NULL;
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jid = -1;
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while ((ch = getopt(argc, argv, "i:n:u:U:")) != -1) {
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switch (ch) {
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case 'n':
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jailname = optarg;
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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 (strlen(argv[0]) > 0) {
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jid = (int)strtol(argv[0], NULL, 10);
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if (errno)
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err(1, "Unable to parse jail ID.");
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}
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if (jid <= 0 && jailname == NULL) {
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fprintf(stderr, "Neither jail ID nor jail name given.\n");
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usage();
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}
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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 = lookup_jail(jid, jailname);
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if (jid <= 0)
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errx(1, "Cannot identify jail.");
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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%s\n",
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"usage: jexec [-u username | -U username]",
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" [-n jailname] jid command ...");
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exit(1);
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}
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