1602 lines
36 KiB
C
1602 lines
36 KiB
C
/*-
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* Copyright (c) 1999 Poul-Henning Kamp.
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* Copyright (c) 2008 Bjoern A. Zeeb.
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/errno.h>
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#include <sys/sysproto.h>
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#include <sys/malloc.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/taskqueue.h>
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#include <sys/fcntl.h>
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#include <sys/jail.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sx.h>
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#include <sys/namei.h>
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#include <sys/mount.h>
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <sys/vimage.h>
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#include <sys/osd.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#ifdef DDB
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#include <ddb/ddb.h>
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#ifdef INET6
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#include <netinet6/in6_var.h>
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#endif /* INET6 */
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#endif /* DDB */
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#include <security/mac/mac_framework.h>
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MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
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SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
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"Jail rules");
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int jail_set_hostname_allowed = 1;
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SYSCTL_INT(_security_jail, OID_AUTO, set_hostname_allowed, CTLFLAG_RW,
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&jail_set_hostname_allowed, 0,
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"Processes in jail can set their hostnames");
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int jail_socket_unixiproute_only = 1;
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SYSCTL_INT(_security_jail, OID_AUTO, socket_unixiproute_only, CTLFLAG_RW,
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&jail_socket_unixiproute_only, 0,
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"Processes in jail are limited to creating UNIX/IP/route sockets only");
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int jail_sysvipc_allowed = 0;
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SYSCTL_INT(_security_jail, OID_AUTO, sysvipc_allowed, CTLFLAG_RW,
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&jail_sysvipc_allowed, 0,
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"Processes in jail can use System V IPC primitives");
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static int jail_enforce_statfs = 2;
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SYSCTL_INT(_security_jail, OID_AUTO, enforce_statfs, CTLFLAG_RW,
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&jail_enforce_statfs, 0,
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"Processes in jail cannot see all mounted file systems");
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int jail_allow_raw_sockets = 0;
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SYSCTL_INT(_security_jail, OID_AUTO, allow_raw_sockets, CTLFLAG_RW,
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&jail_allow_raw_sockets, 0,
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"Prison root can create raw sockets");
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int jail_chflags_allowed = 0;
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SYSCTL_INT(_security_jail, OID_AUTO, chflags_allowed, CTLFLAG_RW,
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&jail_chflags_allowed, 0,
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"Processes in jail can alter system file flags");
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int jail_mount_allowed = 0;
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SYSCTL_INT(_security_jail, OID_AUTO, mount_allowed, CTLFLAG_RW,
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&jail_mount_allowed, 0,
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"Processes in jail can mount/unmount jail-friendly file systems");
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int jail_max_af_ips = 255;
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SYSCTL_INT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
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&jail_max_af_ips, 0,
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"Number of IP addresses a jail may have at most per address family");
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/* allprison, lastprid, and prisoncount are protected by allprison_lock. */
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struct prisonlist allprison;
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struct sx allprison_lock;
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int lastprid = 0;
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int prisoncount = 0;
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static void init_prison(void *);
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static void prison_complete(void *context, int pending);
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static int sysctl_jail_list(SYSCTL_HANDLER_ARGS);
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#ifdef INET
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static int _prison_check_ip4(struct prison *, struct in_addr *);
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#endif
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#ifdef INET6
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static int _prison_check_ip6(struct prison *, struct in6_addr *);
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#endif
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static void
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init_prison(void *data __unused)
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{
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sx_init(&allprison_lock, "allprison");
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LIST_INIT(&allprison);
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}
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SYSINIT(prison, SI_SUB_INTRINSIC, SI_ORDER_ANY, init_prison, NULL);
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#ifdef INET
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static int
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qcmp_v4(const void *ip1, const void *ip2)
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{
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in_addr_t iaa, iab;
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/*
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* We need to compare in HBO here to get the list sorted as expected
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* by the result of the code. Sorting NBO addresses gives you
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* interesting results. If you do not understand, do not try.
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*/
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iaa = ntohl(((const struct in_addr *)ip1)->s_addr);
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iab = ntohl(((const struct in_addr *)ip2)->s_addr);
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/*
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* Do not simply return the difference of the two numbers, the int is
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* not wide enough.
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*/
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if (iaa > iab)
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return (1);
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else if (iaa < iab)
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return (-1);
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else
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return (0);
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}
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#endif
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#ifdef INET6
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static int
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qcmp_v6(const void *ip1, const void *ip2)
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{
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const struct in6_addr *ia6a, *ia6b;
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int i, rc;
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ia6a = (const struct in6_addr *)ip1;
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ia6b = (const struct in6_addr *)ip2;
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rc = 0;
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for (i=0; rc == 0 && i < sizeof(struct in6_addr); i++) {
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if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
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rc = 1;
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else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
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rc = -1;
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}
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return (rc);
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}
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#endif
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#if defined(INET) || defined(INET6)
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static int
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prison_check_conflicting_ips(struct prison *p)
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{
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struct prison *pr;
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int i;
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sx_assert(&allprison_lock, SX_LOCKED);
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if (p->pr_ip4s == 0 && p->pr_ip6s == 0)
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return (0);
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LIST_FOREACH(pr, &allprison, pr_list) {
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/*
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* Skip 'dying' prisons to avoid problems when
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* restarting multi-IP jails.
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*/
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if (pr->pr_state == PRISON_STATE_DYING)
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continue;
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/*
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* We permit conflicting IPs if there is no
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* more than 1 IP on eeach jail.
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* In case there is one duplicate on a jail with
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* more than one IP stop checking and return error.
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*/
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#ifdef INET
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if ((p->pr_ip4s >= 1 && pr->pr_ip4s > 1) ||
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(p->pr_ip4s > 1 && pr->pr_ip4s >= 1)) {
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for (i = 0; i < p->pr_ip4s; i++) {
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if (_prison_check_ip4(pr, &p->pr_ip4[i]))
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return (EINVAL);
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}
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}
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#endif
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#ifdef INET6
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if ((p->pr_ip6s >= 1 && pr->pr_ip6s > 1) ||
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(p->pr_ip6s > 1 && pr->pr_ip6s >= 1)) {
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for (i = 0; i < p->pr_ip6s; i++) {
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if (_prison_check_ip6(pr, &p->pr_ip6[i]))
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return (EINVAL);
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}
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}
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#endif
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}
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return (0);
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}
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static int
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jail_copyin_ips(struct jail *j)
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{
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#ifdef INET
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struct in_addr *ip4;
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#endif
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#ifdef INET6
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struct in6_addr *ip6;
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#endif
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int error, i;
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/*
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* Copy in addresses, check for duplicate addresses and do some
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* simple 0 and broadcast checks. If users give other bogus addresses
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* it is their problem.
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*
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* IP addresses are all sorted but ip[0] to preserve the primary IP
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* address as given from userland. This special IP is used for
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* unbound outgoing connections as well for "loopback" traffic.
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*/
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#ifdef INET
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ip4 = NULL;
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#endif
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#ifdef INET6
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ip6 = NULL;
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#endif
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#ifdef INET
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if (j->ip4s > 0) {
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ip4 = (struct in_addr *)malloc(j->ip4s * sizeof(struct in_addr),
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M_PRISON, M_WAITOK | M_ZERO);
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error = copyin(j->ip4, ip4, j->ip4s * sizeof(struct in_addr));
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if (error)
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goto e_free_ip;
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/* Sort all but the first IPv4 address. */
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if (j->ip4s > 1)
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qsort((ip4 + 1), j->ip4s - 1,
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sizeof(struct in_addr), qcmp_v4);
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/*
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* We do not have to care about byte order for these checks
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* so we will do them in NBO.
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*/
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for (i=0; i<j->ip4s; i++) {
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if (ip4[i].s_addr == htonl(INADDR_ANY) ||
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ip4[i].s_addr == htonl(INADDR_BROADCAST)) {
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error = EINVAL;
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goto e_free_ip;
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}
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if ((i+1) < j->ip4s &&
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(ip4[0].s_addr == ip4[i+1].s_addr ||
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ip4[i].s_addr == ip4[i+1].s_addr)) {
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error = EINVAL;
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goto e_free_ip;
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}
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}
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j->ip4 = ip4;
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}
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#endif
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#ifdef INET6
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if (j->ip6s > 0) {
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ip6 = (struct in6_addr *)malloc(j->ip6s * sizeof(struct in6_addr),
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M_PRISON, M_WAITOK | M_ZERO);
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error = copyin(j->ip6, ip6, j->ip6s * sizeof(struct in6_addr));
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if (error)
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goto e_free_ip;
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/* Sort all but the first IPv6 address. */
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if (j->ip6s > 1)
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qsort((ip6 + 1), j->ip6s - 1,
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sizeof(struct in6_addr), qcmp_v6);
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for (i=0; i<j->ip6s; i++) {
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if (IN6_IS_ADDR_UNSPECIFIED(&ip6[i])) {
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error = EINVAL;
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goto e_free_ip;
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}
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if ((i+1) < j->ip6s &&
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(IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[i+1]) ||
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IN6_ARE_ADDR_EQUAL(&ip6[i], &ip6[i+1]))) {
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error = EINVAL;
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goto e_free_ip;
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}
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}
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j->ip6 = ip6;
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}
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#endif
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return (0);
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e_free_ip:
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#ifdef INET6
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free(ip6, M_PRISON);
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#endif
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#ifdef INET
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free(ip4, M_PRISON);
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#endif
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return (error);
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}
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#endif /* INET || INET6 */
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static int
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jail_handle_ips(struct jail *j)
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{
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#if defined(INET) || defined(INET6)
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int error;
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#endif
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/*
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* Finish conversion for older versions, copyin and setup IPs.
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*/
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switch (j->version) {
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case 0:
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{
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#ifdef INET
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/* FreeBSD single IPv4 jails. */
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struct in_addr *ip4;
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if (j->ip4s == INADDR_ANY || j->ip4s == INADDR_BROADCAST)
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return (EINVAL);
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ip4 = (struct in_addr *)malloc(sizeof(struct in_addr),
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M_PRISON, M_WAITOK | M_ZERO);
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/*
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* Jail version 0 still used HBO for the IPv4 address.
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*/
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ip4->s_addr = htonl(j->ip4s);
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j->ip4s = 1;
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j->ip4 = ip4;
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break;
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#else
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return (EINVAL);
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#endif
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}
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case 1:
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/*
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* Version 1 was used by multi-IPv4 jail implementations
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* that never made it into the official kernel.
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* We should never hit this here; jail() should catch it.
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*/
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return (EINVAL);
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case 2: /* JAIL_API_VERSION */
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/* FreeBSD multi-IPv4/IPv6,noIP jails. */
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#if defined(INET) || defined(INET6)
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#ifdef INET
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if (j->ip4s > jail_max_af_ips)
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return (EINVAL);
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#else
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if (j->ip4s != 0)
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return (EINVAL);
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#endif
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#ifdef INET6
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if (j->ip6s > jail_max_af_ips)
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return (EINVAL);
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#else
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if (j->ip6s != 0)
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return (EINVAL);
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#endif
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error = jail_copyin_ips(j);
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if (error)
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return (error);
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#endif
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break;
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default:
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/* Sci-Fi jails are not supported, sorry. */
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return (EINVAL);
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}
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return (0);
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}
|
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|
|
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/*
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* struct jail_args {
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* struct jail *jail;
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* };
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*/
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int
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jail(struct thread *td, struct jail_args *uap)
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{
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uint32_t version;
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int error;
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struct jail j;
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error = copyin(uap->jail, &version, sizeof(uint32_t));
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if (error)
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return (error);
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|
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switch (version) {
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case 0:
|
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/* FreeBSD single IPv4 jails. */
|
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{
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struct jail_v0 j0;
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bzero(&j, sizeof(struct jail));
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error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
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if (error)
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return (error);
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j.version = j0.version;
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j.path = j0.path;
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j.hostname = j0.hostname;
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j.ip4s = j0.ip_number;
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break;
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}
|
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|
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case 1:
|
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/*
|
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* Version 1 was used by multi-IPv4 jail implementations
|
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* that never made it into the official kernel.
|
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*/
|
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return (EINVAL);
|
|
|
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case 2: /* JAIL_API_VERSION */
|
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/* FreeBSD multi-IPv4/IPv6,noIP jails. */
|
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error = copyin(uap->jail, &j, sizeof(struct jail));
|
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if (error)
|
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return (error);
|
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break;
|
|
|
|
default:
|
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/* Sci-Fi jails are not supported, sorry. */
|
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return (EINVAL);
|
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}
|
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return (kern_jail(td, &j));
|
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}
|
|
|
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int
|
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kern_jail(struct thread *td, struct jail *j)
|
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{
|
|
struct nameidata nd;
|
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struct prison *pr, *tpr;
|
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struct jail_attach_args jaa;
|
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int vfslocked, error, tryprid;
|
|
|
|
KASSERT(j != NULL, ("%s: j is NULL", __func__));
|
|
|
|
/* Handle addresses - convert old structs, copyin, check IPs. */
|
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error = jail_handle_ips(j);
|
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if (error)
|
|
return (error);
|
|
|
|
/* Allocate struct prison and fill it with life. */
|
|
pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
|
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mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF);
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pr->pr_ref = 1;
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error = copyinstr(j->path, &pr->pr_path, sizeof(pr->pr_path), NULL);
|
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if (error)
|
|
goto e_killmtx;
|
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NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW | LOCKLEAF, UIO_SYSSPACE,
|
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pr->pr_path, td);
|
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error = namei(&nd);
|
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if (error)
|
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goto e_killmtx;
|
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vfslocked = NDHASGIANT(&nd);
|
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pr->pr_root = nd.ni_vp;
|
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VOP_UNLOCK(nd.ni_vp, 0);
|
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NDFREE(&nd, NDF_ONLY_PNBUF);
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VFS_UNLOCK_GIANT(vfslocked);
|
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error = copyinstr(j->hostname, &pr->pr_host, sizeof(pr->pr_host), NULL);
|
|
if (error)
|
|
goto e_dropvnref;
|
|
if (j->jailname != NULL) {
|
|
error = copyinstr(j->jailname, &pr->pr_name,
|
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sizeof(pr->pr_name), NULL);
|
|
if (error)
|
|
goto e_dropvnref;
|
|
}
|
|
if (j->ip4s > 0) {
|
|
pr->pr_ip4 = j->ip4;
|
|
pr->pr_ip4s = j->ip4s;
|
|
}
|
|
#ifdef INET6
|
|
if (j->ip6s > 0) {
|
|
pr->pr_ip6 = j->ip6;
|
|
pr->pr_ip6s = j->ip6s;
|
|
}
|
|
#endif
|
|
pr->pr_linux = NULL;
|
|
pr->pr_securelevel = securelevel;
|
|
bzero(&pr->pr_osd, sizeof(pr->pr_osd));
|
|
|
|
/*
|
|
* Pre-set prison state to ALIVE upon cration. This is needed so we
|
|
* can later attach the process to it, etc (avoiding another extra
|
|
* state for ther process of creation, complicating things).
|
|
*/
|
|
pr->pr_state = PRISON_STATE_ALIVE;
|
|
|
|
/* Allocate a dedicated cpuset for each jail. */
|
|
error = cpuset_create_root(td, &pr->pr_cpuset);
|
|
if (error)
|
|
goto e_dropvnref;
|
|
|
|
sx_xlock(&allprison_lock);
|
|
/* Make sure we cannot run into problems with ambiguous bind()ings. */
|
|
#if defined(INET) || defined(INET6)
|
|
error = prison_check_conflicting_ips(pr);
|
|
if (error) {
|
|
sx_xunlock(&allprison_lock);
|
|
goto e_dropcpuset;
|
|
}
|
|
#endif
|
|
|
|
/* Determine next pr_id and add prison to allprison list. */
|
|
tryprid = lastprid + 1;
|
|
if (tryprid == JAIL_MAX)
|
|
tryprid = 1;
|
|
next:
|
|
LIST_FOREACH(tpr, &allprison, pr_list) {
|
|
if (tpr->pr_id == tryprid) {
|
|
tryprid++;
|
|
if (tryprid == JAIL_MAX) {
|
|
sx_xunlock(&allprison_lock);
|
|
error = EAGAIN;
|
|
goto e_dropcpuset;
|
|
}
|
|
goto next;
|
|
}
|
|
}
|
|
pr->pr_id = jaa.jid = lastprid = tryprid;
|
|
LIST_INSERT_HEAD(&allprison, pr, pr_list);
|
|
prisoncount++;
|
|
sx_xunlock(&allprison_lock);
|
|
|
|
error = jail_attach(td, &jaa);
|
|
if (error)
|
|
goto e_dropprref;
|
|
mtx_lock(&pr->pr_mtx);
|
|
pr->pr_ref--;
|
|
mtx_unlock(&pr->pr_mtx);
|
|
td->td_retval[0] = jaa.jid;
|
|
return (0);
|
|
e_dropprref:
|
|
sx_xlock(&allprison_lock);
|
|
LIST_REMOVE(pr, pr_list);
|
|
prisoncount--;
|
|
sx_xunlock(&allprison_lock);
|
|
e_dropcpuset:
|
|
cpuset_rel(pr->pr_cpuset);
|
|
e_dropvnref:
|
|
vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount);
|
|
vrele(pr->pr_root);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
e_killmtx:
|
|
mtx_destroy(&pr->pr_mtx);
|
|
free(pr, M_PRISON);
|
|
#ifdef INET6
|
|
free(j->ip6, M_PRISON);
|
|
#endif
|
|
#ifdef INET
|
|
free(j->ip4, M_PRISON);
|
|
#endif
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* struct jail_attach_args {
|
|
* int jid;
|
|
* };
|
|
*/
|
|
int
|
|
jail_attach(struct thread *td, struct jail_attach_args *uap)
|
|
{
|
|
struct proc *p;
|
|
struct ucred *newcred, *oldcred;
|
|
struct prison *pr;
|
|
int vfslocked, error;
|
|
|
|
/*
|
|
* XXX: Note that there is a slight race here if two threads
|
|
* in the same privileged process attempt to attach to two
|
|
* different jails at the same time. It is important for
|
|
* user processes not to do this, or they might end up with
|
|
* a process root from one prison, but attached to the jail
|
|
* of another.
|
|
*/
|
|
error = priv_check(td, PRIV_JAIL_ATTACH);
|
|
if (error)
|
|
return (error);
|
|
|
|
p = td->td_proc;
|
|
sx_slock(&allprison_lock);
|
|
pr = prison_find(uap->jid);
|
|
if (pr == NULL) {
|
|
sx_sunlock(&allprison_lock);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Do not allow a process to attach to a prison that is not
|
|
* considered to be "ALIVE".
|
|
*/
|
|
if (pr->pr_state != PRISON_STATE_ALIVE) {
|
|
mtx_unlock(&pr->pr_mtx);
|
|
sx_sunlock(&allprison_lock);
|
|
return (EINVAL);
|
|
}
|
|
pr->pr_ref++;
|
|
mtx_unlock(&pr->pr_mtx);
|
|
sx_sunlock(&allprison_lock);
|
|
|
|
/*
|
|
* Reparent the newly attached process to this jail.
|
|
*/
|
|
error = cpuset_setproc_update_set(p, pr->pr_cpuset);
|
|
if (error)
|
|
goto e_unref;
|
|
|
|
vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount);
|
|
vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
|
|
if ((error = change_dir(pr->pr_root, td)) != 0)
|
|
goto e_unlock;
|
|
#ifdef MAC
|
|
if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
|
|
goto e_unlock;
|
|
#endif
|
|
VOP_UNLOCK(pr->pr_root, 0);
|
|
change_root(pr->pr_root, td);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
|
|
newcred = crget();
|
|
PROC_LOCK(p);
|
|
oldcred = p->p_ucred;
|
|
setsugid(p);
|
|
crcopy(newcred, oldcred);
|
|
newcred->cr_prison = pr;
|
|
p->p_ucred = newcred;
|
|
prison_proc_hold(pr);
|
|
PROC_UNLOCK(p);
|
|
crfree(oldcred);
|
|
return (0);
|
|
e_unlock:
|
|
VOP_UNLOCK(pr->pr_root, 0);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
e_unref:
|
|
mtx_lock(&pr->pr_mtx);
|
|
pr->pr_ref--;
|
|
mtx_unlock(&pr->pr_mtx);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Returns a locked prison instance, or NULL on failure.
|
|
*/
|
|
struct prison *
|
|
prison_find(int prid)
|
|
{
|
|
struct prison *pr;
|
|
|
|
sx_assert(&allprison_lock, SX_LOCKED);
|
|
LIST_FOREACH(pr, &allprison, pr_list) {
|
|
if (pr->pr_id == prid) {
|
|
mtx_lock(&pr->pr_mtx);
|
|
if (pr->pr_ref == 0) {
|
|
mtx_unlock(&pr->pr_mtx);
|
|
break;
|
|
}
|
|
return (pr);
|
|
}
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
void
|
|
prison_free_locked(struct prison *pr)
|
|
{
|
|
|
|
mtx_assert(&pr->pr_mtx, MA_OWNED);
|
|
pr->pr_ref--;
|
|
if (pr->pr_ref == 0) {
|
|
mtx_unlock(&pr->pr_mtx);
|
|
TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
|
|
taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
|
|
return;
|
|
}
|
|
mtx_unlock(&pr->pr_mtx);
|
|
}
|
|
|
|
void
|
|
prison_free(struct prison *pr)
|
|
{
|
|
|
|
mtx_lock(&pr->pr_mtx);
|
|
prison_free_locked(pr);
|
|
}
|
|
|
|
static void
|
|
prison_complete(void *context, int pending)
|
|
{
|
|
struct prison *pr;
|
|
int vfslocked;
|
|
|
|
pr = (struct prison *)context;
|
|
|
|
sx_xlock(&allprison_lock);
|
|
LIST_REMOVE(pr, pr_list);
|
|
prisoncount--;
|
|
sx_xunlock(&allprison_lock);
|
|
|
|
cpuset_rel(pr->pr_cpuset);
|
|
|
|
/* Free all OSD associated to this jail. */
|
|
osd_jail_exit(pr);
|
|
|
|
vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount);
|
|
vrele(pr->pr_root);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
|
|
mtx_destroy(&pr->pr_mtx);
|
|
free(pr->pr_linux, M_PRISON);
|
|
#ifdef INET6
|
|
free(pr->pr_ip6, M_PRISON);
|
|
#endif
|
|
#ifdef INET
|
|
free(pr->pr_ip4, M_PRISON);
|
|
#endif
|
|
free(pr, M_PRISON);
|
|
}
|
|
|
|
void
|
|
prison_hold_locked(struct prison *pr)
|
|
{
|
|
|
|
mtx_assert(&pr->pr_mtx, MA_OWNED);
|
|
KASSERT(pr->pr_ref > 0,
|
|
("Trying to hold dead prison (id=%d).", pr->pr_id));
|
|
pr->pr_ref++;
|
|
}
|
|
|
|
void
|
|
prison_hold(struct prison *pr)
|
|
{
|
|
|
|
mtx_lock(&pr->pr_mtx);
|
|
prison_hold_locked(pr);
|
|
mtx_unlock(&pr->pr_mtx);
|
|
}
|
|
|
|
void
|
|
prison_proc_hold(struct prison *pr)
|
|
{
|
|
|
|
mtx_lock(&pr->pr_mtx);
|
|
KASSERT(pr->pr_state == PRISON_STATE_ALIVE,
|
|
("Cannot add a process to a non-alive prison (id=%d).", pr->pr_id));
|
|
pr->pr_nprocs++;
|
|
mtx_unlock(&pr->pr_mtx);
|
|
}
|
|
|
|
void
|
|
prison_proc_free(struct prison *pr)
|
|
{
|
|
|
|
mtx_lock(&pr->pr_mtx);
|
|
KASSERT(pr->pr_state == PRISON_STATE_ALIVE && pr->pr_nprocs > 0,
|
|
("Trying to kill a process in a dead prison (id=%d).", pr->pr_id));
|
|
pr->pr_nprocs--;
|
|
if (pr->pr_nprocs == 0)
|
|
pr->pr_state = PRISON_STATE_DYING;
|
|
mtx_unlock(&pr->pr_mtx);
|
|
}
|
|
|
|
|
|
#ifdef INET
|
|
/*
|
|
* Pass back primary IPv4 address of this jail.
|
|
*
|
|
* If not jailed return success but do not alter the address. Caller has to
|
|
* make sure to intialize it correctly (INADDR_ANY).
|
|
*
|
|
* Returns 0 on success, 1 on error. Address returned in NBO.
|
|
*/
|
|
int
|
|
prison_getip4(struct ucred *cred, struct in_addr *ia)
|
|
{
|
|
|
|
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
|
|
KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
|
|
|
|
if (!jailed(cred))
|
|
/* Do not change address passed in. */
|
|
return (0);
|
|
|
|
if (cred->cr_prison->pr_ip4 == NULL)
|
|
return (1);
|
|
|
|
ia->s_addr = cred->cr_prison->pr_ip4[0].s_addr;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Make sure our (source) address is set to something meaningful to this
|
|
* jail.
|
|
*
|
|
* Returns 0 on success, 1 on error. Address passed in in NBO and returned
|
|
* in NBO.
|
|
*/
|
|
int
|
|
prison_local_ip4(struct ucred *cred, struct in_addr *ia)
|
|
{
|
|
struct in_addr ia0;
|
|
|
|
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
|
|
KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
|
|
|
|
if (!jailed(cred))
|
|
return (0);
|
|
if (cred->cr_prison->pr_ip4 == NULL)
|
|
return (1);
|
|
|
|
ia0.s_addr = ntohl(ia->s_addr);
|
|
if (ia0.s_addr == INADDR_LOOPBACK) {
|
|
ia->s_addr = cred->cr_prison->pr_ip4[0].s_addr;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* In case there is only 1 IPv4 address, bind directly.
|
|
*/
|
|
if (ia0.s_addr == INADDR_ANY && cred->cr_prison->pr_ip4s == 1) {
|
|
ia->s_addr = cred->cr_prison->pr_ip4[0].s_addr;
|
|
return (0);
|
|
}
|
|
|
|
if (ia0.s_addr == INADDR_ANY || prison_check_ip4(cred, ia))
|
|
return (0);
|
|
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Rewrite destination address in case we will connect to loopback address.
|
|
*
|
|
* Returns 0 on success, 1 on error. Address passed in in NBO and returned
|
|
* in NBO.
|
|
*/
|
|
int
|
|
prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
|
|
{
|
|
|
|
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
|
|
KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
|
|
|
|
if (!jailed(cred))
|
|
return (0);
|
|
if (cred->cr_prison->pr_ip4 == NULL)
|
|
return (1);
|
|
if (ntohl(ia->s_addr) == INADDR_LOOPBACK) {
|
|
ia->s_addr = cred->cr_prison->pr_ip4[0].s_addr;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return success because nothing had to be changed.
|
|
*/
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Check if given address belongs to the jail referenced by cred.
|
|
*
|
|
* Returns 1 if address belongs to jail, 0 if not. Address passed in in NBO.
|
|
*/
|
|
static int
|
|
_prison_check_ip4(struct prison *pr, struct in_addr *ia)
|
|
{
|
|
int i, a, z, d;
|
|
|
|
if (pr->pr_ip4 == NULL)
|
|
return (0);
|
|
|
|
/*
|
|
* Check the primary IP.
|
|
*/
|
|
if (pr->pr_ip4[0].s_addr == ia->s_addr)
|
|
return (1);
|
|
|
|
/*
|
|
* All the other IPs are sorted so we can do a binary search.
|
|
*/
|
|
a = 0;
|
|
z = pr->pr_ip4s - 2;
|
|
while (a <= z) {
|
|
i = (a + z) / 2;
|
|
d = qcmp_v4(&pr->pr_ip4[i+1], ia);
|
|
if (d > 0)
|
|
z = i - 1;
|
|
else if (d < 0)
|
|
a = i + 1;
|
|
else
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
prison_check_ip4(struct ucred *cred, struct in_addr *ia)
|
|
{
|
|
|
|
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
|
|
KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
|
|
|
|
if (!jailed(cred))
|
|
return (1);
|
|
|
|
return (_prison_check_ip4(cred->cr_prison, ia));
|
|
}
|
|
#endif
|
|
|
|
#ifdef INET6
|
|
/*
|
|
* Pass back primary IPv6 address for this jail.
|
|
*
|
|
* If not jailed return success but do not alter the address. Caller has to
|
|
* make sure to intialize it correctly (IN6ADDR_ANY_INIT).
|
|
*
|
|
* Returns 0 on success, 1 on error.
|
|
*/
|
|
int
|
|
prison_getip6(struct ucred *cred, struct in6_addr *ia6)
|
|
{
|
|
|
|
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
|
|
KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
|
|
|
|
if (!jailed(cred))
|
|
return (0);
|
|
if (cred->cr_prison->pr_ip6 == NULL)
|
|
return (1);
|
|
bcopy(&cred->cr_prison->pr_ip6[0], ia6, sizeof(struct in6_addr));
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Make sure our (source) address is set to something meaningful to this jail.
|
|
*
|
|
* v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
|
|
* when needed while binding.
|
|
*
|
|
* Returns 0 on success, 1 on error.
|
|
*/
|
|
int
|
|
prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
|
|
{
|
|
|
|
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
|
|
KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
|
|
|
|
if (!jailed(cred))
|
|
return (0);
|
|
if (cred->cr_prison->pr_ip6 == NULL)
|
|
return (1);
|
|
if (IN6_IS_ADDR_LOOPBACK(ia6)) {
|
|
bcopy(&cred->cr_prison->pr_ip6[0], ia6,
|
|
sizeof(struct in6_addr));
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* In case there is only 1 IPv6 address, and v6only is true, then
|
|
* bind directly.
|
|
*/
|
|
if (v6only != 0 && IN6_IS_ADDR_UNSPECIFIED(ia6) &&
|
|
cred->cr_prison->pr_ip6s == 1) {
|
|
bcopy(&cred->cr_prison->pr_ip6[0], ia6,
|
|
sizeof(struct in6_addr));
|
|
return (0);
|
|
}
|
|
if (IN6_IS_ADDR_UNSPECIFIED(ia6) || prison_check_ip6(cred, ia6))
|
|
return (0);
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Rewrite destination address in case we will connect to loopback address.
|
|
*
|
|
* Returns 0 on success, 1 on error.
|
|
*/
|
|
int
|
|
prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
|
|
{
|
|
|
|
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
|
|
KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
|
|
|
|
if (!jailed(cred))
|
|
return (0);
|
|
if (cred->cr_prison->pr_ip6 == NULL)
|
|
return (1);
|
|
if (IN6_IS_ADDR_LOOPBACK(ia6)) {
|
|
bcopy(&cred->cr_prison->pr_ip6[0], ia6,
|
|
sizeof(struct in6_addr));
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return success because nothing had to be changed.
|
|
*/
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Check if given address belongs to the jail referenced by cred.
|
|
*
|
|
* Returns 1 if address belongs to jail, 0 if not.
|
|
*/
|
|
static int
|
|
_prison_check_ip6(struct prison *pr, struct in6_addr *ia6)
|
|
{
|
|
int i, a, z, d;
|
|
|
|
if (pr->pr_ip6 == NULL)
|
|
return (0);
|
|
|
|
/*
|
|
* Check the primary IP.
|
|
*/
|
|
if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
|
|
return (1);
|
|
|
|
/*
|
|
* All the other IPs are sorted so we can do a binary search.
|
|
*/
|
|
a = 0;
|
|
z = pr->pr_ip6s - 2;
|
|
while (a <= z) {
|
|
i = (a + z) / 2;
|
|
d = qcmp_v6(&pr->pr_ip6[i+1], ia6);
|
|
if (d > 0)
|
|
z = i - 1;
|
|
else if (d < 0)
|
|
a = i + 1;
|
|
else
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
prison_check_ip6(struct ucred *cred, struct in6_addr *ia6)
|
|
{
|
|
|
|
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
|
|
KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
|
|
|
|
if (!jailed(cred))
|
|
return (1);
|
|
|
|
return (_prison_check_ip6(cred->cr_prison, ia6));
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Check if given address belongs to the jail referenced by cred (wrapper to
|
|
* prison_check_ip[46]).
|
|
*
|
|
* Returns 1 if address belongs to jail, 0 if not. IPv4 Address passed in in
|
|
* NBO.
|
|
*/
|
|
int
|
|
prison_if(struct ucred *cred, struct sockaddr *sa)
|
|
{
|
|
#ifdef INET
|
|
struct sockaddr_in *sai;
|
|
#endif
|
|
#ifdef INET6
|
|
struct sockaddr_in6 *sai6;
|
|
#endif
|
|
int ok;
|
|
|
|
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
|
|
KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
|
|
|
|
ok = 0;
|
|
switch(sa->sa_family)
|
|
{
|
|
#ifdef INET
|
|
case AF_INET:
|
|
sai = (struct sockaddr_in *)sa;
|
|
if (prison_check_ip4(cred, &sai->sin_addr))
|
|
ok = 1;
|
|
break;
|
|
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
sai6 = (struct sockaddr_in6 *)sa;
|
|
if (prison_check_ip6(cred, (struct in6_addr *)&sai6->sin6_addr))
|
|
ok = 1;
|
|
break;
|
|
|
|
#endif
|
|
default:
|
|
if (!jail_socket_unixiproute_only)
|
|
ok = 1;
|
|
}
|
|
return (ok);
|
|
}
|
|
|
|
/*
|
|
* Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
|
|
*/
|
|
int
|
|
prison_check(struct ucred *cred1, struct ucred *cred2)
|
|
{
|
|
|
|
if (jailed(cred1)) {
|
|
if (!jailed(cred2))
|
|
return (ESRCH);
|
|
if (cred2->cr_prison != cred1->cr_prison)
|
|
return (ESRCH);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return 1 if the passed credential is in a jail, otherwise 0.
|
|
*/
|
|
int
|
|
jailed(struct ucred *cred)
|
|
{
|
|
|
|
return (cred->cr_prison != NULL);
|
|
}
|
|
|
|
/*
|
|
* Return the correct hostname for the passed credential.
|
|
*/
|
|
void
|
|
getcredhostname(struct ucred *cred, char *buf, size_t size)
|
|
{
|
|
INIT_VPROCG(cred->cr_vimage->v_procg);
|
|
|
|
if (jailed(cred)) {
|
|
mtx_lock(&cred->cr_prison->pr_mtx);
|
|
strlcpy(buf, cred->cr_prison->pr_host, size);
|
|
mtx_unlock(&cred->cr_prison->pr_mtx);
|
|
} else {
|
|
mtx_lock(&hostname_mtx);
|
|
strlcpy(buf, V_hostname, size);
|
|
mtx_unlock(&hostname_mtx);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Determine whether the subject represented by cred can "see"
|
|
* status of a mount point.
|
|
* Returns: 0 for permitted, ENOENT otherwise.
|
|
* XXX: This function should be called cr_canseemount() and should be
|
|
* placed in kern_prot.c.
|
|
*/
|
|
int
|
|
prison_canseemount(struct ucred *cred, struct mount *mp)
|
|
{
|
|
struct prison *pr;
|
|
struct statfs *sp;
|
|
size_t len;
|
|
|
|
if (!jailed(cred) || jail_enforce_statfs == 0)
|
|
return (0);
|
|
pr = cred->cr_prison;
|
|
if (pr->pr_root->v_mount == mp)
|
|
return (0);
|
|
if (jail_enforce_statfs == 2)
|
|
return (ENOENT);
|
|
/*
|
|
* If jail's chroot directory is set to "/" we should be able to see
|
|
* all mount-points from inside a jail.
|
|
* This is ugly check, but this is the only situation when jail's
|
|
* directory ends with '/'.
|
|
*/
|
|
if (strcmp(pr->pr_path, "/") == 0)
|
|
return (0);
|
|
len = strlen(pr->pr_path);
|
|
sp = &mp->mnt_stat;
|
|
if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
|
|
return (ENOENT);
|
|
/*
|
|
* Be sure that we don't have situation where jail's root directory
|
|
* is "/some/path" and mount point is "/some/pathpath".
|
|
*/
|
|
if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
|
|
return (ENOENT);
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
|
|
{
|
|
char jpath[MAXPATHLEN];
|
|
struct prison *pr;
|
|
size_t len;
|
|
|
|
if (!jailed(cred) || jail_enforce_statfs == 0)
|
|
return;
|
|
pr = cred->cr_prison;
|
|
if (prison_canseemount(cred, mp) != 0) {
|
|
bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
|
|
strlcpy(sp->f_mntonname, "[restricted]",
|
|
sizeof(sp->f_mntonname));
|
|
return;
|
|
}
|
|
if (pr->pr_root->v_mount == mp) {
|
|
/*
|
|
* Clear current buffer data, so we are sure nothing from
|
|
* the valid path left there.
|
|
*/
|
|
bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
|
|
*sp->f_mntonname = '/';
|
|
return;
|
|
}
|
|
/*
|
|
* If jail's chroot directory is set to "/" we should be able to see
|
|
* all mount-points from inside a jail.
|
|
*/
|
|
if (strcmp(pr->pr_path, "/") == 0)
|
|
return;
|
|
len = strlen(pr->pr_path);
|
|
strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
|
|
/*
|
|
* Clear current buffer data, so we are sure nothing from
|
|
* the valid path left there.
|
|
*/
|
|
bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
|
|
if (*jpath == '\0') {
|
|
/* Should never happen. */
|
|
*sp->f_mntonname = '/';
|
|
} else {
|
|
strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check with permission for a specific privilege is granted within jail. We
|
|
* have a specific list of accepted privileges; the rest are denied.
|
|
*/
|
|
int
|
|
prison_priv_check(struct ucred *cred, int priv)
|
|
{
|
|
|
|
if (!jailed(cred))
|
|
return (0);
|
|
|
|
switch (priv) {
|
|
|
|
/*
|
|
* Allow ktrace privileges for root in jail.
|
|
*/
|
|
case PRIV_KTRACE:
|
|
|
|
#if 0
|
|
/*
|
|
* Allow jailed processes to configure audit identity and
|
|
* submit audit records (login, etc). In the future we may
|
|
* want to further refine the relationship between audit and
|
|
* jail.
|
|
*/
|
|
case PRIV_AUDIT_GETAUDIT:
|
|
case PRIV_AUDIT_SETAUDIT:
|
|
case PRIV_AUDIT_SUBMIT:
|
|
#endif
|
|
|
|
/*
|
|
* Allow jailed processes to manipulate process UNIX
|
|
* credentials in any way they see fit.
|
|
*/
|
|
case PRIV_CRED_SETUID:
|
|
case PRIV_CRED_SETEUID:
|
|
case PRIV_CRED_SETGID:
|
|
case PRIV_CRED_SETEGID:
|
|
case PRIV_CRED_SETGROUPS:
|
|
case PRIV_CRED_SETREUID:
|
|
case PRIV_CRED_SETREGID:
|
|
case PRIV_CRED_SETRESUID:
|
|
case PRIV_CRED_SETRESGID:
|
|
|
|
/*
|
|
* Jail implements visibility constraints already, so allow
|
|
* jailed root to override uid/gid-based constraints.
|
|
*/
|
|
case PRIV_SEEOTHERGIDS:
|
|
case PRIV_SEEOTHERUIDS:
|
|
|
|
/*
|
|
* Jail implements inter-process debugging limits already, so
|
|
* allow jailed root various debugging privileges.
|
|
*/
|
|
case PRIV_DEBUG_DIFFCRED:
|
|
case PRIV_DEBUG_SUGID:
|
|
case PRIV_DEBUG_UNPRIV:
|
|
|
|
/*
|
|
* Allow jail to set various resource limits and login
|
|
* properties, and for now, exceed process resource limits.
|
|
*/
|
|
case PRIV_PROC_LIMIT:
|
|
case PRIV_PROC_SETLOGIN:
|
|
case PRIV_PROC_SETRLIMIT:
|
|
|
|
/*
|
|
* System V and POSIX IPC privileges are granted in jail.
|
|
*/
|
|
case PRIV_IPC_READ:
|
|
case PRIV_IPC_WRITE:
|
|
case PRIV_IPC_ADMIN:
|
|
case PRIV_IPC_MSGSIZE:
|
|
case PRIV_MQ_ADMIN:
|
|
|
|
/*
|
|
* Jail implements its own inter-process limits, so allow
|
|
* root processes in jail to change scheduling on other
|
|
* processes in the same jail. Likewise for signalling.
|
|
*/
|
|
case PRIV_SCHED_DIFFCRED:
|
|
case PRIV_SCHED_CPUSET:
|
|
case PRIV_SIGNAL_DIFFCRED:
|
|
case PRIV_SIGNAL_SUGID:
|
|
|
|
/*
|
|
* Allow jailed processes to write to sysctls marked as jail
|
|
* writable.
|
|
*/
|
|
case PRIV_SYSCTL_WRITEJAIL:
|
|
|
|
/*
|
|
* Allow root in jail to manage a variety of quota
|
|
* properties. These should likely be conditional on a
|
|
* configuration option.
|
|
*/
|
|
case PRIV_VFS_GETQUOTA:
|
|
case PRIV_VFS_SETQUOTA:
|
|
|
|
/*
|
|
* Since Jail relies on chroot() to implement file system
|
|
* protections, grant many VFS privileges to root in jail.
|
|
* Be careful to exclude mount-related and NFS-related
|
|
* privileges.
|
|
*/
|
|
case PRIV_VFS_READ:
|
|
case PRIV_VFS_WRITE:
|
|
case PRIV_VFS_ADMIN:
|
|
case PRIV_VFS_EXEC:
|
|
case PRIV_VFS_LOOKUP:
|
|
case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
|
|
case PRIV_VFS_CHFLAGS_DEV:
|
|
case PRIV_VFS_CHOWN:
|
|
case PRIV_VFS_CHROOT:
|
|
case PRIV_VFS_RETAINSUGID:
|
|
case PRIV_VFS_FCHROOT:
|
|
case PRIV_VFS_LINK:
|
|
case PRIV_VFS_SETGID:
|
|
case PRIV_VFS_STAT:
|
|
case PRIV_VFS_STICKYFILE:
|
|
return (0);
|
|
|
|
/*
|
|
* Depending on the global setting, allow privilege of
|
|
* setting system flags.
|
|
*/
|
|
case PRIV_VFS_SYSFLAGS:
|
|
if (jail_chflags_allowed)
|
|
return (0);
|
|
else
|
|
return (EPERM);
|
|
|
|
/*
|
|
* Depending on the global setting, allow privilege of
|
|
* mounting/unmounting file systems.
|
|
*/
|
|
case PRIV_VFS_MOUNT:
|
|
case PRIV_VFS_UNMOUNT:
|
|
case PRIV_VFS_MOUNT_NONUSER:
|
|
case PRIV_VFS_MOUNT_OWNER:
|
|
if (jail_mount_allowed)
|
|
return (0);
|
|
else
|
|
return (EPERM);
|
|
|
|
/*
|
|
* Allow jailed root to bind reserved ports and reuse in-use
|
|
* ports.
|
|
*/
|
|
case PRIV_NETINET_RESERVEDPORT:
|
|
case PRIV_NETINET_REUSEPORT:
|
|
return (0);
|
|
|
|
/*
|
|
* Allow jailed root to set certian IPv4/6 (option) headers.
|
|
*/
|
|
case PRIV_NETINET_SETHDROPTS:
|
|
return (0);
|
|
|
|
/*
|
|
* Conditionally allow creating raw sockets in jail.
|
|
*/
|
|
case PRIV_NETINET_RAW:
|
|
if (jail_allow_raw_sockets)
|
|
return (0);
|
|
else
|
|
return (EPERM);
|
|
|
|
/*
|
|
* Since jail implements its own visibility limits on netstat
|
|
* sysctls, allow getcred. This allows identd to work in
|
|
* jail.
|
|
*/
|
|
case PRIV_NETINET_GETCRED:
|
|
return (0);
|
|
|
|
default:
|
|
/*
|
|
* In all remaining cases, deny the privilege request. This
|
|
* includes almost all network privileges, many system
|
|
* configuration privileges.
|
|
*/
|
|
return (EPERM);
|
|
}
|
|
}
|
|
|
|
static int
|
|
sysctl_jail_list(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct xprison *xp, *sxp;
|
|
struct prison *pr;
|
|
char *p;
|
|
size_t len;
|
|
int count, error;
|
|
|
|
if (jailed(req->td->td_ucred))
|
|
return (0);
|
|
|
|
sx_slock(&allprison_lock);
|
|
if ((count = prisoncount) == 0) {
|
|
sx_sunlock(&allprison_lock);
|
|
return (0);
|
|
}
|
|
|
|
len = sizeof(*xp) * count;
|
|
LIST_FOREACH(pr, &allprison, pr_list) {
|
|
#ifdef INET
|
|
len += pr->pr_ip4s * sizeof(struct in_addr);
|
|
#endif
|
|
#ifdef INET6
|
|
len += pr->pr_ip6s * sizeof(struct in6_addr);
|
|
#endif
|
|
}
|
|
|
|
sxp = xp = malloc(len, M_TEMP, M_WAITOK | M_ZERO);
|
|
|
|
LIST_FOREACH(pr, &allprison, pr_list) {
|
|
xp->pr_version = XPRISON_VERSION;
|
|
xp->pr_id = pr->pr_id;
|
|
xp->pr_state = pr->pr_state;
|
|
xp->pr_cpusetid = pr->pr_cpuset->cs_id;
|
|
strlcpy(xp->pr_path, pr->pr_path, sizeof(xp->pr_path));
|
|
mtx_lock(&pr->pr_mtx);
|
|
strlcpy(xp->pr_host, pr->pr_host, sizeof(xp->pr_host));
|
|
strlcpy(xp->pr_name, pr->pr_name, sizeof(xp->pr_name));
|
|
mtx_unlock(&pr->pr_mtx);
|
|
#ifdef INET
|
|
xp->pr_ip4s = pr->pr_ip4s;
|
|
#endif
|
|
#ifdef INET6
|
|
xp->pr_ip6s = pr->pr_ip6s;
|
|
#endif
|
|
p = (char *)(xp + 1);
|
|
#ifdef INET
|
|
if (pr->pr_ip4s > 0) {
|
|
bcopy(pr->pr_ip4, (struct in_addr *)p,
|
|
pr->pr_ip4s * sizeof(struct in_addr));
|
|
p += (pr->pr_ip4s * sizeof(struct in_addr));
|
|
}
|
|
#endif
|
|
#ifdef INET6
|
|
if (pr->pr_ip6s > 0) {
|
|
bcopy(pr->pr_ip6, (struct in6_addr *)p,
|
|
pr->pr_ip6s * sizeof(struct in6_addr));
|
|
p += (pr->pr_ip6s * sizeof(struct in6_addr));
|
|
}
|
|
#endif
|
|
xp = (struct xprison *)p;
|
|
}
|
|
sx_sunlock(&allprison_lock);
|
|
|
|
error = SYSCTL_OUT(req, sxp, len);
|
|
free(sxp, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_OID(_security_jail, OID_AUTO, list, CTLTYPE_STRUCT | CTLFLAG_RD,
|
|
NULL, 0, sysctl_jail_list, "S", "List of active jails");
|
|
|
|
static int
|
|
sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error, injail;
|
|
|
|
injail = jailed(req->td->td_ucred);
|
|
error = SYSCTL_OUT(req, &injail, sizeof(injail));
|
|
|
|
return (error);
|
|
}
|
|
SYSCTL_PROC(_security_jail, OID_AUTO, jailed, CTLTYPE_INT | CTLFLAG_RD,
|
|
NULL, 0, sysctl_jail_jailed, "I", "Process in jail?");
|
|
|
|
#ifdef DDB
|
|
DB_SHOW_COMMAND(jails, db_show_jails)
|
|
{
|
|
struct prison *pr;
|
|
#ifdef INET
|
|
struct in_addr ia;
|
|
#endif
|
|
#ifdef INET6
|
|
char ip6buf[INET6_ADDRSTRLEN];
|
|
#endif
|
|
const char *state;
|
|
#if defined(INET) || defined(INET6)
|
|
int i;
|
|
#endif
|
|
|
|
db_printf(
|
|
" JID pr_ref pr_nprocs pr_ip4s pr_ip6s\n");
|
|
db_printf(
|
|
" Hostname Path\n");
|
|
db_printf(
|
|
" Name State\n");
|
|
db_printf(
|
|
" Cpusetid\n");
|
|
db_printf(
|
|
" IP Address(es)\n");
|
|
LIST_FOREACH(pr, &allprison, pr_list) {
|
|
db_printf("%6d %6d %9d %7d %7d\n",
|
|
pr->pr_id, pr->pr_ref, pr->pr_nprocs,
|
|
pr->pr_ip4s, pr->pr_ip6s);
|
|
db_printf("%6s %-29.29s %.74s\n",
|
|
"", pr->pr_host, pr->pr_path);
|
|
if (pr->pr_state < 0 || pr->pr_state > (int)((sizeof(
|
|
prison_states) / sizeof(struct prison_state))))
|
|
state = "(bogus)";
|
|
else
|
|
state = prison_states[pr->pr_state].state_name;
|
|
db_printf("%6s %-29.29s %.74s\n",
|
|
"", (pr->pr_name != NULL) ? pr->pr_name : "", state);
|
|
db_printf("%6s %-6d\n",
|
|
"", pr->pr_cpuset->cs_id);
|
|
#ifdef INET
|
|
for (i=0; i < pr->pr_ip4s; i++) {
|
|
ia.s_addr = pr->pr_ip4[i].s_addr;
|
|
db_printf("%6s %s\n", "", inet_ntoa(ia));
|
|
}
|
|
#endif
|
|
#ifdef INET6
|
|
for (i=0; i < pr->pr_ip6s; i++)
|
|
db_printf("%6s %s\n",
|
|
"", ip6_sprintf(ip6buf, &pr->pr_ip6[i]));
|
|
#endif /* INET6 */
|
|
if (db_pager_quit)
|
|
break;
|
|
}
|
|
}
|
|
#endif /* DDB */
|