HardenedBSD/sys/security/mac/mac_inet6.c

/*-
 * Copyright (c) 2007-2009 Robert N. M. Watson
 * All rights reserved.
 *
 * This software was developed by Robert Watson for the TrustedBSD Project.
 *
 * This software was developed at the University of Cambridge Computer
 * Laboratory with support from a grant from Google, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#include "opt_mac.h"

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/sbuf.h>
#include <sys/systm.h>
#include <sys/mount.h>
#include <sys/file.h>
#include <sys/namei.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>

#include <net/if.h>
#include <net/if_var.h>

#include <netinet/in.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>

#include <security/mac/mac_framework.h>
#include <security/mac/mac_internal.h>
#include <security/mac/mac_policy.h>

static struct label *
mac_ip6q_label_alloc(int flag)
{
	struct label *label;
	int error;

	label = mac_labelzone_alloc(flag);
	if (label == NULL)
		return (NULL);

	if (flag & M_WAITOK)
		MAC_POLICY_CHECK(ip6q_init_label, label, flag);
	else
		MAC_POLICY_CHECK_NOSLEEP(ip6q_init_label, label, flag);
	if (error) {
		MAC_POLICY_PERFORM_NOSLEEP(ip6q_destroy_label, label);
		mac_labelzone_free(label);
		return (NULL);
	}
	return (label);
}

int
mac_ip6q_init(struct ip6q *q6, int flag)
{

	if (mac_labeled & MPC_OBJECT_IP6Q) {
		q6->ip6q_label = mac_ip6q_label_alloc(flag);
		if (q6->ip6q_label == NULL)
			return (ENOMEM);
	} else
		q6->ip6q_label = NULL;
	return (0);
}

static void
mac_ip6q_label_free(struct label *label)
{

	MAC_POLICY_PERFORM_NOSLEEP(ip6q_destroy_label, label);
	mac_labelzone_free(label);
}

void
mac_ip6q_destroy(struct ip6q *q6)
{

	if (q6->ip6q_label != NULL) {
		mac_ip6q_label_free(q6->ip6q_label);
		q6->ip6q_label = NULL;
	}
}

void
mac_ip6q_reassemble(struct ip6q *q6, struct mbuf *m)
{
	struct label *label;

	if (mac_policy_count == 0)
		return;

	label = mac_mbuf_to_label(m);

	MAC_POLICY_PERFORM_NOSLEEP(ip6q_reassemble, q6, q6->ip6q_label, m,
	    label);
}

void
mac_ip6q_create(struct mbuf *m, struct ip6q *q6)
{
	struct label *label;

	if (mac_policy_count == 0)
		return;

	label = mac_mbuf_to_label(m);

	MAC_POLICY_PERFORM_NOSLEEP(ip6q_create, m, label, q6,
	    q6->ip6q_label);
}

int
mac_ip6q_match(struct mbuf *m, struct ip6q *q6)
{
	struct label *label;
	int result;

	if (mac_policy_count == 0)
		return (1);

	label = mac_mbuf_to_label(m);

	result = 1;
	MAC_POLICY_BOOLEAN_NOSLEEP(ip6q_match, &&, m, label, q6,
	    q6->ip6q_label);

	return (result);
}

void
mac_ip6q_update(struct mbuf *m, struct ip6q *q6)
{
	struct label *label;

	if (mac_policy_count == 0)
		return;

	label = mac_mbuf_to_label(m);

	MAC_POLICY_PERFORM_NOSLEEP(ip6q_update, m, label, q6,
	    q6->ip6q_label);
}

/* Check with rules in module if the IPv6 address is allowed. */
int
mac_inet6_check_add_addr(struct ucred *cred, const struct in6_addr *ia6,
    struct ifnet *ifp)
{
	int error;

	MAC_POLICY_CHECK(ip6_check_jail, cred, ia6, ifp);
	return (error);
}

void
mac_netinet6_nd6_send(struct ifnet *ifp, struct mbuf *m)
{
	struct label *mlabel;

	if (mac_policy_count == 0)
		return;

	mlabel = mac_mbuf_to_label(m);

	MAC_POLICY_PERFORM_NOSLEEP(netinet6_nd6_send, ifp, if_getmaclabel(ifp), m,
	    mlabel);
}