[apple/xnu.git] / security / mac_posix_shm.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) 2003-2005 Networks Associates Technology, Inc.
 * All rights reserved.
 *
 * 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.
 *
 * 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 <sys/param.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/posix_shm.h>
#include <sys/sbuf.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/vnode.h>

#include <security/mac_internal.h>

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

	label = mac_labelzone_alloc(MAC_WAITOK);
	if (label == NULL)
		return (NULL);
	MAC_PERFORM(posixshm_label_init, label);
	return (label);
}

void
mac_posixshm_label_init(struct pshminfo *pshm)
{

	pshm->pshm_label = mac_posixshm_label_alloc();
}

static void
mac_posixshm_label_free(struct label *label)
{

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

void
mac_posixshm_label_destroy(struct pshminfo *pshm)
{

	mac_posixshm_label_free(pshm->pshm_label);
	pshm->pshm_label = NULL;
}

void
mac_posixshm_vnode_label_associate(kauth_cred_t cred,
	struct pshminfo *pshm, struct label *plabel,
	vnode_t vp, struct label *vlabel)
{
	MAC_PERFORM(vnode_label_associate_posixshm, cred, 
		    pshm, plabel, vp, vlabel);
}

void
mac_posixshm_label_associate(kauth_cred_t cred, struct pshminfo *pshm,
    const char *name)
{

	MAC_PERFORM(posixshm_label_associate, cred, pshm, pshm->pshm_label, name);
}

int
mac_posixshm_check_create(kauth_cred_t cred, const char *name)
{
	int error = 0;

#if SECURITY_MAC_CHECK_ENFORCE
    /* 21167099 - only check if we allow write */
    if (!mac_posixshm_enforce)
        return 0;
#endif

	MAC_CHECK(posixshm_check_create, cred, name);

	return error;
}

int
mac_posixshm_check_open(kauth_cred_t cred, struct pshminfo *shm, int fflags)
{
	int error = 0;

#if SECURITY_MAC_CHECK_ENFORCE
    /* 21167099 - only check if we allow write */
    if (!mac_posixshm_enforce)
        return 0;
#endif

	MAC_CHECK(posixshm_check_open, cred, shm, shm->pshm_label, fflags);

	return (error);
}

int
mac_posixshm_check_mmap(kauth_cred_t cred, struct pshminfo *shm,
    int prot, int flags)
{
	int error = 0;

#if SECURITY_MAC_CHECK_ENFORCE
    /* 21167099 - only check if we allow write */
    if (!mac_posixshm_enforce)
        return 0;
#endif

	MAC_CHECK(posixshm_check_mmap, cred, shm, shm->pshm_label,
            prot, flags);

	return (error);
}

int
mac_posixshm_check_stat(kauth_cred_t cred, struct pshminfo *shm)
{
	int error = 0;

#if SECURITY_MAC_CHECK_ENFORCE
    /* 21167099 - only check if we allow write */
    if (!mac_posixshm_enforce)
        return 0;
#endif

	MAC_CHECK(posixshm_check_stat, cred, shm, shm->pshm_label);

	return (error);
}

int
mac_posixshm_check_truncate(kauth_cred_t cred, struct pshminfo *shm,
    off_t size)
{
	int error = 0;

#if SECURITY_MAC_CHECK_ENFORCE
    /* 21167099 - only check if we allow write */
    if (!mac_posixshm_enforce)
        return 0;
#endif

	MAC_CHECK(posixshm_check_truncate, cred, shm, shm->pshm_label, size);

	return (error);
}

int
mac_posixshm_check_unlink(kauth_cred_t cred, struct pshminfo *shm,
    const char *name)
{
	int error = 0;

#if SECURITY_MAC_CHECK_ENFORCE
    /* 21167099 - only check if we allow write */
    if (!mac_posixshm_enforce)
        return 0;
#endif

	MAC_CHECK(posixshm_check_unlink, cred, shm, shm->pshm_label, name);

	return (error);
}
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) 2003-2005 Networks Associates Technology, Inc.
	30	* All rights reserved.
	31	*
	32	* This software was developed for the FreeBSD Project in part by Network
	33	* Associates Laboratories, the Security Research Division of Network
	34	* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
	35	* as part of the DARPA CHATS research program.
	36	*
	37	* Redistribution and use in source and binary forms, with or without
	38	* modification, are permitted provided that the following conditions
	39	* are met:
	40	* 1. Redistributions of source code must retain the above copyright
	41	* notice, this list of conditions and the following disclaimer.
	42	* 2. Redistributions in binary form must reproduce the above copyright
	43	* notice, this list of conditions and the following disclaimer in the
	44	* documentation and/or other materials provided with the distribution.
	45	*
	46	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	47	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	48	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	49	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	50	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	51	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	52	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	53	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	54	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	55	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	56	* SUCH DAMAGE.
	57	*/
	58
	59	#include <sys/cdefs.h>
	60
	61	#include <sys/param.h>
	62	#include <sys/kernel.h>
	63	#include <sys/lock.h>
	64	#include <sys/malloc.h>
65	#include <sys/posix_shm.h>
66	#include <sys/sbuf.h>
67	#include <sys/systm.h>
68	#include <sys/sysctl.h>
69	#include <sys/vnode.h>
70
71	#include <security/mac_internal.h>
72
73	static struct label *
74	mac_posixshm_label_alloc(void)
75	{
76	struct label *label;
77
78	label = mac_labelzone_alloc(MAC_WAITOK);
79	if (label == NULL)
80	return (NULL);
81	MAC_PERFORM(posixshm_label_init, label);
82	return (label);
83	}
84
85	void
86	mac_posixshm_label_init(struct pshminfo *pshm)
87	{
88
89	pshm->pshm_label = mac_posixshm_label_alloc();
90	}
91
92	static void
93	mac_posixshm_label_free(struct label *label)
94	{
95
96	MAC_PERFORM(posixshm_label_destroy, label);
97	mac_labelzone_free(label);
98	}
99
100	void
101	mac_posixshm_label_destroy(struct pshminfo *pshm)
102	{
103
104	mac_posixshm_label_free(pshm->pshm_label);
105	pshm->pshm_label = NULL;
106	}
107
108	void
109	mac_posixshm_vnode_label_associate(kauth_cred_t cred,
110	struct pshminfo pshm, struct label plabel,
111	vnode_t vp, struct label *vlabel)
112	{
113	MAC_PERFORM(vnode_label_associate_posixshm, cred,
114	pshm, plabel, vp, vlabel);
115	}
116
117	void
118	mac_posixshm_label_associate(kauth_cred_t cred, struct pshminfo *pshm,
119	const char *name)
120	{
121
122	MAC_PERFORM(posixshm_label_associate, cred, pshm, pshm->pshm_label, name);
123	}
124
125	int
126	mac_posixshm_check_create(kauth_cred_t cred, const char *name)
127	{
128	int error = 0;
129
3e170ce0 A	130	#if SECURITY_MAC_CHECK_ENFORCE
	131	/* 21167099 - only check if we allow write */
	132	if (!mac_posixshm_enforce)
	133	return 0;
	134	#endif
2d21ac55 A	135
	136	MAC_CHECK(posixshm_check_create, cred, name);
	137
	138	return error;
	139	}
	140
	141	int
316670eb	142	mac_posixshm_check_open(kauth_cred_t cred, struct pshminfo *shm, int fflags)
2d21ac55 A	143	{
	144	int error = 0;
	145
3e170ce0 A	146	#if SECURITY_MAC_CHECK_ENFORCE
	147	/* 21167099 - only check if we allow write */
	148	if (!mac_posixshm_enforce)
	149	return 0;
	150	#endif
2d21ac55	151
316670eb	152	MAC_CHECK(posixshm_check_open, cred, shm, shm->pshm_label, fflags);
2d21ac55 A	153
	154	return (error);
	155	}
	156
	157	int
	158	mac_posixshm_check_mmap(kauth_cred_t cred, struct pshminfo *shm,
	159	int prot, int flags)
	160	{
	161	int error = 0;
	162
3e170ce0 A	163	#if SECURITY_MAC_CHECK_ENFORCE
	164	/* 21167099 - only check if we allow write */
	165	if (!mac_posixshm_enforce)
	166	return 0;
	167	#endif
2d21ac55 A	168
	169	MAC_CHECK(posixshm_check_mmap, cred, shm, shm->pshm_label,
	170	prot, flags);
	171
	172	return (error);
	173	}
	174
	175	int
	176	mac_posixshm_check_stat(kauth_cred_t cred, struct pshminfo *shm)
	177	{
	178	int error = 0;
	179
3e170ce0 A	180	#if SECURITY_MAC_CHECK_ENFORCE
	181	/* 21167099 - only check if we allow write */
	182	if (!mac_posixshm_enforce)
	183	return 0;
	184	#endif
2d21ac55 A	185
	186	MAC_CHECK(posixshm_check_stat, cred, shm, shm->pshm_label);
	187
	188	return (error);
	189	}
	190
	191	int
	192	mac_posixshm_check_truncate(kauth_cred_t cred, struct pshminfo *shm,
6d2010ae	193	off_t size)
2d21ac55 A	194	{
	195	int error = 0;
	196
3e170ce0 A	197	#if SECURITY_MAC_CHECK_ENFORCE
	198	/* 21167099 - only check if we allow write */
	199	if (!mac_posixshm_enforce)
	200	return 0;
	201	#endif
2d21ac55 A	202
	203	MAC_CHECK(posixshm_check_truncate, cred, shm, shm->pshm_label, size);
	204
	205	return (error);
	206	}
	207
	208	int
	209	mac_posixshm_check_unlink(kauth_cred_t cred, struct pshminfo *shm,
	210	const char *name)
	211	{
	212	int error = 0;
	213
3e170ce0 A	214	#if SECURITY_MAC_CHECK_ENFORCE
	215	/* 21167099 - only check if we allow write */
	216	if (!mac_posixshm_enforce)
	217	return 0;
	218	#endif
2d21ac55 A	219
	220	MAC_CHECK(posixshm_check_unlink, cred, shm, shm->pshm_label, name);
	221
	222	return (error);
	223	}