[apple/xnu.git] / security / mac_net.c

/*
 * Copyright (c) 2007 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*-
 * Copyright (c) 1999-2002 Robert N. M. Watson
 * Copyright (c) 2001 Ilmar S. Habibulin
 * Copyright (c) 2001-2004 Networks Associates Technology, Inc.
 * Copyright (c) 2006 SPARTA, Inc.
 * All rights reserved.
 *
 * This software was developed by Robert Watson and Ilmar Habibulin for the
 * TrustedBSD Project.
 *
 * This software was developed for the FreeBSD Project in part by Network
 * Associates Laboratories, the Security Research Division of Network
 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
 * as part of the DARPA CHATS research program.
 *
 * This software was enhanced by SPARTA ISSO under SPAWAR contract
 * N66001-04-C-6019 ("SEFOS").
 *
 * 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/param.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>

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

#include <bsd/bsm/audit.h>
#include <bsd/security/audit/audit.h>

#include <security/mac_internal.h>

struct label *
mac_mbuf_to_label(struct mbuf *mbuf)
{
	struct m_tag *tag;
	struct label *label;

	if (mbuf == NULL)
		return (NULL);

	if ((mbuf->m_flags & M_PKTHDR) == 0) {
		printf("%s() got non-header MBUF!\n", __func__);
		return (NULL);
	}

	tag = m_tag_locate(mbuf, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_MACLABEL,
			   NULL);
	if (tag == NULL) {
		printf("%s() m_tag_locate() returned NULL! (m->flags %04x)\n",
			__func__, mbuf->m_flags);
		return (NULL);
	}
	label = (struct label *)(tag+1);
	return (label);
}

static struct label *
mac_bpfdesc_label_alloc(void)
{
	struct label *label;

	label = mac_labelzone_alloc(M_WAITOK);
	if (label == NULL)
		return (NULL);
	MAC_PERFORM(bpfdesc_label_init, label);
	return (label);
}

void
mac_bpfdesc_label_init(struct bpf_d *bpf_d)
{
	struct label *label;

	label = mac_bpfdesc_label_alloc();
	mac_bpfdesc_label_set(bpf_d, label);
}

static struct label *
mac_ifnet_label_alloc(void)
{
	struct label *label;

	label = mac_labelzone_alloc(M_WAITOK);
	if (label == NULL)
		return (NULL);
	MAC_PERFORM(ifnet_label_init, label);
	return (label);
}

void
mac_ifnet_label_init(struct ifnet *ifp)
{

	ifp->if_label = mac_ifnet_label_alloc();
}

/*
 * On failure, caller should cleanup with m_tag_free().
 */
int
mac_mbuf_tag_init(struct m_tag *tag, int flag)
{
	struct label *label;
	int error;

	label = (struct label *) (tag + 1);
	mac_label_init(label);

	MAC_CHECK(mbuf_label_init, label, flag);
	if (error)
		printf("%s(): mpo_mbuf_label_init() failed!\n", __func__);

	return (error);
}

static void
mac_bpfdesc_label_free(struct label *label)
{

	MAC_PERFORM(bpfdesc_label_destroy, label);
	mac_labelzone_free(label);
}

void
mac_bpfdesc_label_destroy(struct bpf_d *bpf_d)
{
	struct label *label;

	label = mac_bpfdesc_label_get(bpf_d);
	mac_bpfdesc_label_free(label);
	mac_bpfdesc_label_set(bpf_d, NULL);
}

static void
mac_ifnet_label_free(struct label *label)
{

	MAC_PERFORM(ifnet_label_destroy, label);
	mac_labelzone_free(label);
}

void
mac_ifnet_label_destroy(struct ifnet *ifp)
{

	mac_ifnet_label_free(ifp->if_label);
	ifp->if_label = NULL;
}

void
mac_ifnet_label_recycle(struct ifnet *ifp)
{

	MAC_PERFORM(ifnet_label_recycle, ifp->if_label);
}

void
mac_mbuf_tag_destroy(struct m_tag *tag)
{
	struct label *label;

	label = (struct label *)(tag + 1);
	MAC_PERFORM(mbuf_label_destroy, label);
	mac_label_destroy(label);

	return;
}

void
mac_mbuf_tag_copy(struct m_tag *src, struct m_tag *dest)
{
	struct label *src_label, *dest_label;

	src_label = (struct label *)(src + 1);
	dest_label = (struct label *)(dest + 1);

	if (src_label == NULL || dest_label == NULL)
		return;

	/*
	 * mac_mbuf_tag_init() is called on the target tag
	 * in m_tag_copy(), so we don't need to call it here.
	 */
	MAC_PERFORM(mbuf_label_copy, src_label, dest_label);

	return;
}

void
mac_mbuf_label_copy(struct mbuf *m_from, struct mbuf *m_to)
{
	struct label *src_label, *dest_label;

	src_label = mac_mbuf_to_label(m_from);
	dest_label = mac_mbuf_to_label(m_to);

	MAC_PERFORM(mbuf_label_copy, src_label, dest_label);
}

static void
mac_ifnet_label_copy(struct label *src, struct label *dest)
{

	MAC_PERFORM(ifnet_label_copy, src, dest);
}

static int
mac_ifnet_label_externalize(struct label *label, char *elements,
    char *outbuf, size_t outbuflen)
{

	return (MAC_EXTERNALIZE(ifnet, label, elements, outbuf, outbuflen));
}

static int
mac_ifnet_label_internalize(struct label *label, char *string)
{

	return (MAC_INTERNALIZE(ifnet, label, string));
}

void
mac_ifnet_label_associate(struct ifnet *ifp)
{

	MAC_PERFORM(ifnet_label_associate, ifp, ifp->if_label);
}

void
mac_bpfdesc_label_associate(struct ucred *cred, struct bpf_d *bpf_d)
{
	struct label *label;

	label = mac_bpfdesc_label_get(bpf_d);
	MAC_PERFORM(bpfdesc_label_associate, cred, bpf_d, label);
}

int
mac_bpfdesc_check_receive(struct bpf_d *bpf_d, struct ifnet *ifp)
{
	struct label *label;
	int error;

	label = mac_bpfdesc_label_get(bpf_d);
	ifnet_lock_shared(ifp);
	MAC_CHECK(bpfdesc_check_receive, bpf_d, label, ifp,
	    ifp->if_label);
	ifnet_lock_done(ifp);

	return (error);
}

int
mac_mbuf_label_init(struct mbuf *m, int flag)
{
	struct m_tag *tag;
	int error;

	if (mac_label_mbufs == 0)
		return (0);

	tag = m_tag_create(KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_MACLABEL,
			  sizeof(struct label), flag, m);
	if (tag == NULL) {
		printf("%s(): m_tag_alloc() failed!\n", __func__);
		return (ENOBUFS);
	}
	error = mac_mbuf_tag_init(tag, flag);
	if (error) {
		printf("%s(): mac_mbuf_tag_init() failed!\n", __func__);
		m_tag_free(tag);
		return (error);
	}
	m_tag_prepend(m, tag);
	return (0);
}

void
mac_mbuf_label_associate_bpfdesc(struct bpf_d *bpf_d, struct mbuf *mbuf)
{
	struct label *m_label, *b_label;

	/* bpf_d must be locked */

	m_label = mac_mbuf_to_label(mbuf);
	b_label = mac_bpfdesc_label_get(bpf_d);

	MAC_PERFORM(mbuf_label_associate_bpfdesc, bpf_d, b_label, mbuf,
	    m_label);
}

void
mac_mbuf_label_associate_ifnet(struct ifnet *ifp, struct mbuf *mbuf)
{
	struct label *m_label;

	/* ifp must be locked */

	m_label = mac_mbuf_to_label(mbuf);

	MAC_PERFORM(mbuf_label_associate_ifnet, ifp, ifp->if_label, mbuf,
	    m_label);
}

void
mac_mbuf_label_associate_linklayer(struct ifnet *ifp, struct mbuf *mbuf)
{
	struct label *m_label;

	/* ifp must be locked */

	m_label = mac_mbuf_to_label(mbuf);

	MAC_PERFORM(mbuf_label_associate_linklayer, ifp, ifp->if_label, mbuf,
	    m_label);
}

void
mac_mbuf_label_associate_multicast_encap(struct mbuf *oldmbuf,
    struct ifnet *ifp, struct mbuf *newmbuf)
{
	struct label *oldmbuflabel, *newmbuflabel;

	oldmbuflabel = mac_mbuf_to_label(oldmbuf);
	newmbuflabel = mac_mbuf_to_label(newmbuf);

	/* ifp must be locked */

	MAC_PERFORM(mbuf_label_associate_multicast_encap, oldmbuf, oldmbuflabel,
	    ifp, ifp->if_label, newmbuf, newmbuflabel);
}

void
mac_mbuf_label_associate_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf)
{
	struct label *oldmbuflabel, *newmbuflabel;

	oldmbuflabel = mac_mbuf_to_label(oldmbuf);
	newmbuflabel = mac_mbuf_to_label(newmbuf);

	MAC_PERFORM(mbuf_label_associate_netlayer, oldmbuf, oldmbuflabel,
	    newmbuf, newmbuflabel);
}

void
mac_mbuf_label_associate_socket(struct socket *socket, struct mbuf *mbuf)
{
	struct label *label;
	struct xsocket xso;

	/* socket must be locked */

	label = mac_mbuf_to_label(mbuf);

	sotoxsocket(socket, &xso);
	MAC_PERFORM(mbuf_label_associate_socket, &xso, socket->so_label,
		    mbuf, label);
}

int
mac_ifnet_check_transmit(struct ifnet *ifp, struct mbuf *mbuf, int family,
    int type)
{
	struct label *label;
	int error;

	label = mac_mbuf_to_label(mbuf);

	ifnet_lock_shared(ifp);
	MAC_CHECK(ifnet_check_transmit, ifp, ifp->if_label, mbuf, label,
	    family, type);
	ifnet_lock_done(ifp);

	return (error);
}

int
mac_ifnet_label_get(__unused struct ucred *cred, struct ifreq *ifr,
    struct ifnet *ifp)
{
	char *elements, *buffer;
	struct label *intlabel;
	struct mac mac;
	int error;
	size_t len;

	error = copyin(CAST_USER_ADDR_T(ifr->ifr_ifru.ifru_data),
	    &mac, sizeof(mac));
	if (error)
		return (error);

	error = mac_check_structmac_consistent(&mac);
	if (error)
		return (error);

	MALLOC(elements, char *, mac.m_buflen, M_MACTEMP, M_WAITOK);
	error = copyinstr(CAST_USER_ADDR_T(mac.m_string), elements,
	    mac.m_buflen, &len);
	if (error) {
		FREE(elements, M_MACTEMP);
		return (error);
	}
	AUDIT_ARG(mac_string, elements);

	MALLOC(buffer, char *, mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO);
	intlabel = mac_ifnet_label_alloc();
	ifnet_lock_shared(ifp);
	mac_ifnet_label_copy(ifp->if_label, intlabel);
	ifnet_lock_done(ifp);
	error = mac_ifnet_label_externalize(intlabel, elements,
	    buffer, mac.m_buflen);
	mac_ifnet_label_free(intlabel);
	FREE(elements, M_MACTEMP);

	if (error == 0)
		error = copyout(buffer, CAST_USER_ADDR_T(mac.m_string),
		    strlen(buffer) + 1);
	FREE(buffer, M_MACTEMP);

	return (error);
}

int
mac_ifnet_label_set(struct ucred *cred, struct ifreq *ifr,
    struct ifnet *ifp)
{
	struct label *intlabel;
	struct mac mac;
	char *buffer;
	int error;
	size_t len;

	error = copyin(CAST_USER_ADDR_T(ifr->ifr_ifru.ifru_data),
	    &mac, sizeof(mac));
	if (error)
		return (error);

	error = mac_check_structmac_consistent(&mac);
	if (error)
		return (error);

	MALLOC(buffer, char *, mac.m_buflen, M_MACTEMP, M_WAITOK);
	error = copyinstr(CAST_USER_ADDR_T(mac.m_string), buffer,
	    mac.m_buflen, &len);
	if (error) {
		FREE(buffer, M_MACTEMP);
		return (error);
	}
	AUDIT_ARG(mac_string, buffer);

	intlabel = mac_ifnet_label_alloc();
	error = mac_ifnet_label_internalize(intlabel, buffer);
	FREE(buffer, M_MACTEMP);
	if (error) {
		mac_ifnet_label_free(intlabel);
		return (error);
	}

	/*
	 * XXX: Note that this is a redundant privilege check, since
	 * policies impose this check themselves if required by the
	 * policy.  Eventually, this should go away.
	 */
	error = suser(cred, NULL);
	if (error) {
		mac_ifnet_label_free(intlabel);
		return (error);
	}

	ifnet_lock_exclusive(ifp);
	MAC_CHECK(ifnet_check_label_update, cred, ifp, ifp->if_label,
	    intlabel);
	if (error) {
		ifnet_lock_done(ifp);
		mac_ifnet_label_free(intlabel);
		return (error);
	}

	MAC_PERFORM(ifnet_label_update, cred, ifp, ifp->if_label, intlabel);
	ifnet_lock_done(ifp);
	mac_ifnet_label_free(intlabel);

	return (0);
}
Commit	Line	Data
2d21ac55 A	1	/*
	2	* Copyright (c) 2007 Apple Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28	/*-
	29	* Copyright (c) 1999-2002 Robert N. M. Watson
	30	* Copyright (c) 2001 Ilmar S. Habibulin
	31	* Copyright (c) 2001-2004 Networks Associates Technology, Inc.
	32	* Copyright (c) 2006 SPARTA, Inc.
	33	* All rights reserved.
	34	*
	35	* This software was developed by Robert Watson and Ilmar Habibulin for the
	36	* TrustedBSD Project.
	37	*
	38	* This software was developed for the FreeBSD Project in part by Network
	39	* Associates Laboratories, the Security Research Division of Network
	40	* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
	41	* as part of the DARPA CHATS research program.
	42	*
	43	* This software was enhanced by SPARTA ISSO under SPAWAR contract
	44	* N66001-04-C-6019 ("SEFOS").
	45	*
	46	* Redistribution and use in source and binary forms, with or without
	47	* modification, are permitted provided that the following conditions
	48	* are met:
	49	* 1. Redistributions of source code must retain the above copyright
	50	* notice, this list of conditions and the following disclaimer.
	51	* 2. Redistributions in binary form must reproduce the above copyright
	52	* notice, this list of conditions and the following disclaimer in the
	53	* documentation and/or other materials provided with the distribution.
	54	*
	55	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	56	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	57	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	58	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	59	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	60	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	61	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	62	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	63	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	64	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
65	* SUCH DAMAGE.
66	*/
67
68	#include <sys/param.h>
69	#include <sys/kernel.h>
70	#include <sys/mbuf.h>
71
72	#include <net/bpf.h>
73	#include <net/if.h>
74
75	#include <bsd/bsm/audit.h>
b0d623f7	76	#include <bsd/security/audit/audit.h>
2d21ac55 A	77
	78	#include <security/mac_internal.h>
	79
	80	struct label *
	81	mac_mbuf_to_label(struct mbuf *mbuf)
	82	{
	83	struct m_tag *tag;
	84	struct label *label;
	85
	86	if (mbuf == NULL)
	87	return (NULL);
	88
	89	if ((mbuf->m_flags & M_PKTHDR) == 0) {
	90	printf("%s() got non-header MBUF!\n", __func__);
	91	return (NULL);
	92	}
	93
	94	tag = m_tag_locate(mbuf, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_MACLABEL,
	95	NULL);
	96	if (tag == NULL) {
	97	printf("%s() m_tag_locate() returned NULL! (m->flags %04x)\n",
	98	__func__, mbuf->m_flags);
	99	return (NULL);
	100	}
	101	label = (struct label *)(tag+1);
	102	return (label);
	103	}
	104
	105	static struct label *
	106	mac_bpfdesc_label_alloc(void)
	107	{
	108	struct label *label;
	109
	110	label = mac_labelzone_alloc(M_WAITOK);
	111	if (label == NULL)
	112	return (NULL);
	113	MAC_PERFORM(bpfdesc_label_init, label);
	114	return (label);
	115	}
	116
	117	void
	118	mac_bpfdesc_label_init(struct bpf_d *bpf_d)
	119	{
	120	struct label *label;
	121
	122	label = mac_bpfdesc_label_alloc();
	123	mac_bpfdesc_label_set(bpf_d, label);
	124	}
	125
	126	static struct label *
	127	mac_ifnet_label_alloc(void)
	128	{
	129	struct label *label;
	130
	131	label = mac_labelzone_alloc(M_WAITOK);
	132	if (label == NULL)
	133	return (NULL);
	134	MAC_PERFORM(ifnet_label_init, label);
	135	return (label);
	136	}
	137
	138	void
	139	mac_ifnet_label_init(struct ifnet *ifp)
	140	{
141
142	ifp->if_label = mac_ifnet_label_alloc();
143	}
144
145	/*
146	* On failure, caller should cleanup with m_tag_free().
147	*/
148	int
149	mac_mbuf_tag_init(struct m_tag *tag, int flag)
150	{
151	struct label *label;
152	int error;
153
154	label = (struct label *) (tag + 1);
155	mac_label_init(label);
156
157	MAC_CHECK(mbuf_label_init, label, flag);
158	if (error)
159	printf("%s(): mpo_mbuf_label_init() failed!\n", __func__);
160
161	return (error);
162	}
163
164	static void
165	mac_bpfdesc_label_free(struct label *label)
166	{
167
168	MAC_PERFORM(bpfdesc_label_destroy, label);
169	mac_labelzone_free(label);
170	}
171
172	void
173	mac_bpfdesc_label_destroy(struct bpf_d *bpf_d)
174	{
175	struct label *label;
176
177	label = mac_bpfdesc_label_get(bpf_d);
178	mac_bpfdesc_label_free(label);
179	mac_bpfdesc_label_set(bpf_d, NULL);
180	}
181
182	static void
183	mac_ifnet_label_free(struct label *label)
184	{
185
186	MAC_PERFORM(ifnet_label_destroy, label);
187	mac_labelzone_free(label);
188	}
189
190	void
191	mac_ifnet_label_destroy(struct ifnet *ifp)
192	{
193
194	mac_ifnet_label_free(ifp->if_label);
195	ifp->if_label = NULL;
196	}
197
198	void
199	mac_ifnet_label_recycle(struct ifnet *ifp)
200	{
201
202	MAC_PERFORM(ifnet_label_recycle, ifp->if_label);
203	}
204
205	void
206	mac_mbuf_tag_destroy(struct m_tag *tag)
207	{
208	struct label *label;
209
210	label = (struct label *)(tag + 1);
211	MAC_PERFORM(mbuf_label_destroy, label);
212	mac_label_destroy(label);
213
214	return;
215	}
216
217	void
218	mac_mbuf_tag_copy(struct m_tag src, struct m_tag dest)
219	{
220	struct label src_label, dest_label;
221
222	src_label = (struct label *)(src + 1);
223	dest_label = (struct label *)(dest + 1);
224
225	if (src_label == NULL \|\| dest_label == NULL)
226	return;
227
228	/*
229	* mac_mbuf_tag_init() is called on the target tag
230	* in m_tag_copy(), so we don't need to call it here.
231	*/
232	MAC_PERFORM(mbuf_label_copy, src_label, dest_label);
233
234	return;
235	}
236
237	void
238	mac_mbuf_label_copy(struct mbuf m_from, struct mbuf m_to)
239	{
240	struct label src_label, dest_label;
241
242	src_label = mac_mbuf_to_label(m_from);
243	dest_label = mac_mbuf_to_label(m_to);
244
245	MAC_PERFORM(mbuf_label_copy, src_label, dest_label);
246	}
247
248	static void
249	mac_ifnet_label_copy(struct label src, struct label dest)
250	{
251
252	MAC_PERFORM(ifnet_label_copy, src, dest);
253	}
254
255	static int
256	mac_ifnet_label_externalize(struct label label, char elements,
257	char *outbuf, size_t outbuflen)
258	{
259
260	return (MAC_EXTERNALIZE(ifnet, label, elements, outbuf, outbuflen));
261	}
262
263	static int
264	mac_ifnet_label_internalize(struct label label, char string)
265	{
266
267	return (MAC_INTERNALIZE(ifnet, label, string));
268	}
269
270	void
271	mac_ifnet_label_associate(struct ifnet *ifp)
272	{
273
274	MAC_PERFORM(ifnet_label_associate, ifp, ifp->if_label);
275	}
276
277	void
278	mac_bpfdesc_label_associate(struct ucred cred, struct bpf_d bpf_d)
279	{
280	struct label *label;
281
282	label = mac_bpfdesc_label_get(bpf_d);
283	MAC_PERFORM(bpfdesc_label_associate, cred, bpf_d, label);
284	}
285
286	int
287	mac_bpfdesc_check_receive(struct bpf_d bpf_d, struct ifnet ifp)
288	{
289	struct label *label;
290	int error;
291
292	label = mac_bpfdesc_label_get(bpf_d);
293	ifnet_lock_shared(ifp);
294	MAC_CHECK(bpfdesc_check_receive, bpf_d, label, ifp,
295	ifp->if_label);
296	ifnet_lock_done(ifp);
297
298	return (error);
299	}
300
301	int
302	mac_mbuf_label_init(struct mbuf *m, int flag)
303	{
304	struct m_tag *tag;
305	int error;
306
307	if (mac_label_mbufs == 0)
308	return (0);
309
6d2010ae A	310	tag = m_tag_create(KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_MACLABEL,
6d2010ae A	311	sizeof(struct label), flag, m);
2d21ac55 A	312	if (tag == NULL) {
	313	printf("%s(): m_tag_alloc() failed!\n", __func__);
	314	return (ENOBUFS);
	315	}
	316	error = mac_mbuf_tag_init(tag, flag);
	317	if (error) {
	318	printf("%s(): mac_mbuf_tag_init() failed!\n", __func__);
	319	m_tag_free(tag);
	320	return (error);
	321	}
	322	m_tag_prepend(m, tag);
	323	return (0);
	324	}
	325
	326	void
	327	mac_mbuf_label_associate_bpfdesc(struct bpf_d bpf_d, struct mbuf mbuf)
	328	{
	329	struct label m_label, b_label;
	330
	331	/* bpf_d must be locked */
	332
	333	m_label = mac_mbuf_to_label(mbuf);
	334	b_label = mac_bpfdesc_label_get(bpf_d);
	335
	336	MAC_PERFORM(mbuf_label_associate_bpfdesc, bpf_d, b_label, mbuf,
	337	m_label);
	338	}
	339
	340	void
	341	mac_mbuf_label_associate_ifnet(struct ifnet ifp, struct mbuf mbuf)
	342	{
	343	struct label *m_label;
	344
	345	/* ifp must be locked */
	346
	347	m_label = mac_mbuf_to_label(mbuf);
	348
	349	MAC_PERFORM(mbuf_label_associate_ifnet, ifp, ifp->if_label, mbuf,
	350	m_label);
	351	}
	352
	353	void
	354	mac_mbuf_label_associate_linklayer(struct ifnet ifp, struct mbuf mbuf)
	355	{
	356	struct label *m_label;
	357
	358	/* ifp must be locked */
	359
	360	m_label = mac_mbuf_to_label(mbuf);
	361
	362	MAC_PERFORM(mbuf_label_associate_linklayer, ifp, ifp->if_label, mbuf,
	363	m_label);
	364	}
	365
	366	void
	367	mac_mbuf_label_associate_multicast_encap(struct mbuf *oldmbuf,
	368	struct ifnet ifp, struct mbuf newmbuf)
	369	{
	370	struct label oldmbuflabel, newmbuflabel;
	371
	372	oldmbuflabel = mac_mbuf_to_label(oldmbuf);
	373	newmbuflabel = mac_mbuf_to_label(newmbuf);
	374
	375	/* ifp must be locked */
376
377	MAC_PERFORM(mbuf_label_associate_multicast_encap, oldmbuf, oldmbuflabel,
378	ifp, ifp->if_label, newmbuf, newmbuflabel);
379	}
380
381	void
382	mac_mbuf_label_associate_netlayer(struct mbuf oldmbuf, struct mbuf newmbuf)
383	{
384	struct label oldmbuflabel, newmbuflabel;
385
386	oldmbuflabel = mac_mbuf_to_label(oldmbuf);
387	newmbuflabel = mac_mbuf_to_label(newmbuf);
388
389	MAC_PERFORM(mbuf_label_associate_netlayer, oldmbuf, oldmbuflabel,
390	newmbuf, newmbuflabel);
391	}
392
393	void
394	mac_mbuf_label_associate_socket(struct socket socket, struct mbuf mbuf)
395	{
396	struct label *label;
397	struct xsocket xso;
398
399	/* socket must be locked */
400
401	label = mac_mbuf_to_label(mbuf);
402
403	sotoxsocket(socket, &xso);
404	MAC_PERFORM(mbuf_label_associate_socket, &xso, socket->so_label,
405	mbuf, label);
406	}
407
408	int
409	mac_ifnet_check_transmit(struct ifnet ifp, struct mbuf mbuf, int family,
410	int type)
411	{
412	struct label *label;
413	int error;
414
415	label = mac_mbuf_to_label(mbuf);
416
417	ifnet_lock_shared(ifp);
418	MAC_CHECK(ifnet_check_transmit, ifp, ifp->if_label, mbuf, label,
419	family, type);
420	ifnet_lock_done(ifp);
421
422	return (error);
423	}
424
425	int
426	mac_ifnet_label_get(__unused struct ucred cred, struct ifreq ifr,
427	struct ifnet *ifp)
428	{
429	char elements, buffer;
430	struct label *intlabel;
431	struct mac mac;
432	int error;
433	size_t len;
434
435	error = copyin(CAST_USER_ADDR_T(ifr->ifr_ifru.ifru_data),
436	&mac, sizeof(mac));
437	if (error)
438	return (error);
439
440	error = mac_check_structmac_consistent(&mac);
441	if (error)
442	return (error);
443
444	MALLOC(elements, char *, mac.m_buflen, M_MACTEMP, M_WAITOK);
445	error = copyinstr(CAST_USER_ADDR_T(mac.m_string), elements,
446	mac.m_buflen, &len);
447	if (error) {
448	FREE(elements, M_MACTEMP);
449	return (error);
450	}
451	AUDIT_ARG(mac_string, elements);
452
453	MALLOC(buffer, char *, mac.m_buflen, M_MACTEMP, M_WAITOK \| M_ZERO);
454	intlabel = mac_ifnet_label_alloc();
455	ifnet_lock_shared(ifp);
456	mac_ifnet_label_copy(ifp->if_label, intlabel);
457	ifnet_lock_done(ifp);
458	error = mac_ifnet_label_externalize(intlabel, elements,
459	buffer, mac.m_buflen);
460	mac_ifnet_label_free(intlabel);
461	FREE(elements, M_MACTEMP);
462
463	if (error == 0)
464	error = copyout(buffer, CAST_USER_ADDR_T(mac.m_string),
465	strlen(buffer) + 1);
466	FREE(buffer, M_MACTEMP);
467
468	return (error);
469	}
470
471	int
472	mac_ifnet_label_set(struct ucred cred, struct ifreq ifr,
473	struct ifnet *ifp)
474	{
475	struct label *intlabel;
476	struct mac mac;
477	char *buffer;
478	int error;
479	size_t len;
480
481	error = copyin(CAST_USER_ADDR_T(ifr->ifr_ifru.ifru_data),
482	&mac, sizeof(mac));
483	if (error)
484	return (error);
485
486	error = mac_check_structmac_consistent(&mac);
487	if (error)
488	return (error);
489
490	MALLOC(buffer, char *, mac.m_buflen, M_MACTEMP, M_WAITOK);
491	error = copyinstr(CAST_USER_ADDR_T(mac.m_string), buffer,
492	mac.m_buflen, &len);
493	if (error) {
494	FREE(buffer, M_MACTEMP);
495	return (error);
496	}
497	AUDIT_ARG(mac_string, buffer);
498
499	intlabel = mac_ifnet_label_alloc();
500	error = mac_ifnet_label_internalize(intlabel, buffer);
501	FREE(buffer, M_MACTEMP);
502	if (error) {
503	mac_ifnet_label_free(intlabel);
504	return (error);
505	}
506
507	/*
508	* XXX: Note that this is a redundant privilege check, since
509	* policies impose this check themselves if required by the
510	* policy. Eventually, this should go away.
511	*/
512	error = suser(cred, NULL);
513	if (error) {
514	mac_ifnet_label_free(intlabel);
515	return (error);
516	}
517
518	ifnet_lock_exclusive(ifp);
519	MAC_CHECK(ifnet_check_label_update, cred, ifp, ifp->if_label,
520	intlabel);
521	if (error) {
522	ifnet_lock_done(ifp);
523	mac_ifnet_label_free(intlabel);
524	return (error);
525	}
526
527	MAC_PERFORM(ifnet_label_update, cred, ifp, ifp->if_label, intlabel);
528	ifnet_lock_done(ifp);
529	mac_ifnet_label_free(intlabel);
530
531	return (0);
532	}