2016-08-09 02:16:21 +00:00
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/*-
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* Copyright (c) 1999 Poul-Henning Kamp.
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* Copyright (c) 2008 Bjoern A. Zeeb.
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* Copyright (c) 2009 James Gritton.
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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 <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/osd.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/racct.h>
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#include <sys/refcount.h>
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#include <sys/sx.h>
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#include <sys/sysent.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 <net/if.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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int
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prison_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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/*
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* Restrict a prison's IP address list with its parent's, possibly replacing
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* it. Return true if the replacement buffer was used (or would have been).
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*/
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int
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prison_restrict_ip4(struct prison *pr, struct in_addr *newip4)
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{
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int ii, ij, used;
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struct prison *ppr;
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ppr = pr->pr_parent;
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if (!(pr->pr_flags & PR_IP4_USER)) {
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/* This has no user settings, so just copy the parent's list. */
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if (pr->pr_ip4s < ppr->pr_ip4s) {
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/*
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* There's no room for the parent's list. Use the
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* new list buffer, which is assumed to be big enough
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* (if it was passed). If there's no buffer, try to
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* allocate one.
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*/
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used = 1;
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if (newip4 == NULL) {
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newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4),
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M_PRISON, M_NOWAIT);
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if (newip4 != NULL)
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used = 0;
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}
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if (newip4 != NULL) {
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bcopy(ppr->pr_ip4, newip4,
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ppr->pr_ip4s * sizeof(*newip4));
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free(pr->pr_ip4, M_PRISON);
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pr->pr_ip4 = newip4;
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pr->pr_ip4s = ppr->pr_ip4s;
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}
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return (used);
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}
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pr->pr_ip4s = ppr->pr_ip4s;
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if (pr->pr_ip4s > 0)
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bcopy(ppr->pr_ip4, pr->pr_ip4,
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pr->pr_ip4s * sizeof(*newip4));
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else if (pr->pr_ip4 != NULL) {
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free(pr->pr_ip4, M_PRISON);
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pr->pr_ip4 = NULL;
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}
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} else if (pr->pr_ip4s > 0) {
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/* Remove addresses that aren't in the parent. */
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for (ij = 0; ij < ppr->pr_ip4s; ij++)
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if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
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break;
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if (ij < ppr->pr_ip4s)
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ii = 1;
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else {
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bcopy(pr->pr_ip4 + 1, pr->pr_ip4,
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--pr->pr_ip4s * sizeof(*pr->pr_ip4));
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ii = 0;
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}
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for (ij = 1; ii < pr->pr_ip4s; ) {
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if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) {
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ii++;
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continue;
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}
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switch (ij >= ppr->pr_ip4s ? -1 :
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prison_qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) {
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case -1:
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bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii,
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(--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4));
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break;
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case 0:
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ii++;
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ij++;
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break;
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case 1:
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ij++;
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break;
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}
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}
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if (pr->pr_ip4s == 0) {
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free(pr->pr_ip4, M_PRISON);
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pr->pr_ip4 = NULL;
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}
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}
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return (0);
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}
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/*
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* Pass back primary IPv4 address of this jail.
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*
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* If not restricted return success but do not alter the address. Caller has
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* to make sure to initialize it correctly (e.g. INADDR_ANY).
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*
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* Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
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* Address returned in NBO.
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*/
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int
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prison_get_ip4(struct ucred *cred, struct in_addr *ia)
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{
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struct prison *pr;
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KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
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KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
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pr = cred->cr_prison;
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if (!(pr->pr_flags & PR_IP4))
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return (0);
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mtx_lock(&pr->pr_mtx);
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if (!(pr->pr_flags & PR_IP4)) {
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mtx_unlock(&pr->pr_mtx);
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return (0);
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}
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if (pr->pr_ip4 == NULL) {
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mtx_unlock(&pr->pr_mtx);
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return (EAFNOSUPPORT);
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}
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ia->s_addr = pr->pr_ip4[0].s_addr;
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mtx_unlock(&pr->pr_mtx);
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return (0);
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}
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/*
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* Return 1 if we should do proper source address selection or are not jailed.
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* We will return 0 if we should bypass source address selection in favour
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* of the primary jail IPv4 address. Only in this case *ia will be updated and
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* returned in NBO.
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* Return EAFNOSUPPORT, in case this jail does not allow IPv4.
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*/
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int
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prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
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{
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struct prison *pr;
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struct in_addr lia;
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int error;
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KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
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KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
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if (!jailed(cred))
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return (1);
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pr = cred->cr_prison;
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if (pr->pr_flags & PR_IP4_SADDRSEL)
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return (1);
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lia.s_addr = INADDR_ANY;
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error = prison_get_ip4(cred, &lia);
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if (error)
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return (error);
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if (lia.s_addr == INADDR_ANY)
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return (1);
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ia->s_addr = lia.s_addr;
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return (0);
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}
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/*
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* Return true if pr1 and pr2 have the same IPv4 address restrictions.
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*/
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int
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prison_equal_ip4(struct prison *pr1, struct prison *pr2)
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{
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if (pr1 == pr2)
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return (1);
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/*
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* No need to lock since the PR_IP4_USER flag can't be altered for
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* existing prisons.
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*/
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while (pr1 != &prison0 &&
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#ifdef VIMAGE
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!(pr1->pr_flags & PR_VNET) &&
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#endif
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!(pr1->pr_flags & PR_IP4_USER))
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pr1 = pr1->pr_parent;
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while (pr2 != &prison0 &&
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#ifdef VIMAGE
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!(pr2->pr_flags & PR_VNET) &&
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#endif
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!(pr2->pr_flags & PR_IP4_USER))
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pr2 = pr2->pr_parent;
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return (pr1 == pr2);
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}
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/*
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* Make sure our (source) address is set to something meaningful to this
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* jail.
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*
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* Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
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* EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
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* doesn't allow IPv4. Address passed in in NBO and returned in NBO.
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*/
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int
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prison_local_ip4(struct ucred *cred, struct in_addr *ia)
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{
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struct prison *pr;
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struct in_addr ia0;
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int error;
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KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
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KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
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pr = cred->cr_prison;
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if (!(pr->pr_flags & PR_IP4))
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return (0);
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mtx_lock(&pr->pr_mtx);
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if (!(pr->pr_flags & PR_IP4)) {
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mtx_unlock(&pr->pr_mtx);
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return (0);
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}
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if (pr->pr_ip4 == NULL) {
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mtx_unlock(&pr->pr_mtx);
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return (EAFNOSUPPORT);
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}
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ia0.s_addr = ntohl(ia->s_addr);
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if (ia0.s_addr == INADDR_ANY) {
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/*
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* In case there is only 1 IPv4 address, bind directly.
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*/
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if (pr->pr_ip4s == 1)
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ia->s_addr = pr->pr_ip4[0].s_addr;
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mtx_unlock(&pr->pr_mtx);
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return (0);
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}
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error = prison_check_ip4_locked(pr, ia);
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if (error == EADDRNOTAVAIL && ia0.s_addr == INADDR_LOOPBACK) {
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ia->s_addr = pr->pr_ip4[0].s_addr;
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error = 0;
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}
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2016-08-09 02:16:21 +00:00
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mtx_unlock(&pr->pr_mtx);
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return (error);
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}
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/*
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* Rewrite destination address in case we will connect to loopback address.
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*
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* Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
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* Address passed in in NBO and returned in NBO.
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*/
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int
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prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
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{
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struct prison *pr;
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KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
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KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
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pr = cred->cr_prison;
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if (!(pr->pr_flags & PR_IP4))
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return (0);
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mtx_lock(&pr->pr_mtx);
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if (!(pr->pr_flags & PR_IP4)) {
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mtx_unlock(&pr->pr_mtx);
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return (0);
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}
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if (pr->pr_ip4 == NULL) {
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mtx_unlock(&pr->pr_mtx);
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return (EAFNOSUPPORT);
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}
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2017-03-31 00:41:54 +00:00
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if (ntohl(ia->s_addr) == INADDR_LOOPBACK &&
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prison_check_ip4_locked(pr, ia) == EADDRNOTAVAIL) {
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2016-08-09 02:16:21 +00:00
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ia->s_addr = pr->pr_ip4[0].s_addr;
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mtx_unlock(&pr->pr_mtx);
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return (0);
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}
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/*
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* Return success because nothing had to be changed.
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*/
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|
mtx_unlock(&pr->pr_mtx);
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check if given address belongs to the jail referenced by cred/prison.
|
|
|
|
*
|
2017-03-31 00:41:54 +00:00
|
|
|
* Returns 0 if address belongs to jail,
|
|
|
|
* EADDRNOTAVAIL if the address doesn't belong to the jail.
|
2016-08-09 02:16:21 +00:00
|
|
|
*/
|
|
|
|
int
|
|
|
|
prison_check_ip4_locked(const struct prison *pr, const struct in_addr *ia)
|
|
|
|
{
|
|
|
|
int i, a, z, d;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check the primary IP.
|
|
|
|
*/
|
|
|
|
if (pr->pr_ip4[0].s_addr == ia->s_addr)
|
|
|
|
return (0);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 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 = prison_qcmp_v4(&pr->pr_ip4[i+1], ia);
|
|
|
|
if (d > 0)
|
|
|
|
z = i - 1;
|
|
|
|
else if (d < 0)
|
|
|
|
a = i + 1;
|
|
|
|
else
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
return (EADDRNOTAVAIL);
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
prison_check_ip4(const struct ucred *cred, const struct in_addr *ia)
|
|
|
|
{
|
|
|
|
struct prison *pr;
|
|
|
|
int error;
|
|
|
|
|
|
|
|
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
|
|
|
|
KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
|
|
|
|
|
|
|
|
pr = cred->cr_prison;
|
|
|
|
if (!(pr->pr_flags & PR_IP4))
|
|
|
|
return (0);
|
|
|
|
mtx_lock(&pr->pr_mtx);
|
|
|
|
if (!(pr->pr_flags & PR_IP4)) {
|
|
|
|
mtx_unlock(&pr->pr_mtx);
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
if (pr->pr_ip4 == NULL) {
|
|
|
|
mtx_unlock(&pr->pr_mtx);
|
|
|
|
return (EAFNOSUPPORT);
|
|
|
|
}
|
|
|
|
|
|
|
|
error = prison_check_ip4_locked(pr, ia);
|
|
|
|
mtx_unlock(&pr->pr_mtx);
|
|
|
|
return (error);
|
|
|
|
}
|