1/*-
2 * Copyright (c) 2003-2004 Networks Associates Technology, Inc.
3 * Copyright (c) 2007 Robert N. M. Watson
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project in part by Network
7 * Associates Laboratories, the Security Research Division of Network
8 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
9 * as part of the DARPA CHATS research program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34#include "opt_mac.h"
35
36#include <sys/param.h>
37#include <sys/module.h>
38#include <sys/sysctl.h>
39#include <sys/systm.h>
40
41#include <vm/uma.h>
42
43#include <security/mac/mac_framework.h>
44#include <security/mac/mac_internal.h>
45#include <security/mac/mac_policy.h>
46
47/*
48 * zone_label is the UMA zone from which most labels are allocated.  Label
49 * structures are initialized to zero bytes so that policies see a NULL/0
50 * slot on first use, even if the policy is loaded after the label is
51 * allocated for an object.
52 */
53static uma_zone_t	zone_label;
54
55static int	mac_labelzone_ctor(void *mem, int size, void *arg, int flags);
56static void	mac_labelzone_dtor(void *mem, int size, void *arg);
57
58void
59mac_labelzone_init(void)
60{
61
62	zone_label = uma_zcreate("MAC labels", sizeof(struct label),
63	    mac_labelzone_ctor, mac_labelzone_dtor, NULL, NULL,
64	    UMA_ALIGN_PTR, 0);
65}
66
67/*
68 * mac_init_label() and mac_destroy_label() are exported so that they can be
69 * used in mbuf tag initialization, where labels are not slab allocated from
70 * the zone_label zone.
71 */
72void
73mac_init_label(struct label *label)
74{
75
76	bzero(label, sizeof(*label));
77	label->l_flags = MAC_FLAG_INITIALIZED;
78}
79
80void
81mac_destroy_label(struct label *label)
82{
83
84	KASSERT(label->l_flags & MAC_FLAG_INITIALIZED,
85	    ("destroying uninitialized label"));
86
87#ifdef DIAGNOSTIC
88	bzero(label, sizeof(*label));
89#else
90	label->l_flags &= ~MAC_FLAG_INITIALIZED;
91#endif
92}
93
94static int
95mac_labelzone_ctor(void *mem, int size, void *arg, int flags)
96{
97	struct label *label;
98
99	KASSERT(size == sizeof(*label), ("mac_labelzone_ctor: wrong size\n"));
100	label = mem;
101	mac_init_label(label);
102	return (0);
103}
104
105static void
106mac_labelzone_dtor(void *mem, int size, void *arg)
107{
108	struct label *label;
109
110	KASSERT(size == sizeof(*label), ("mac_labelzone_dtor: wrong size\n"));
111	label = mem;
112	mac_destroy_label(label);
113}
114
115struct label *
116mac_labelzone_alloc(int flags)
117{
118
119	return (uma_zalloc(zone_label, flags));
120}
121
122void
123mac_labelzone_free(struct label *label)
124{
125
126	uma_zfree(zone_label, label);
127}
128
129/*
130 * Functions used by policy modules to get and set label values.
131 */
132intptr_t
133mac_label_get(struct label *l, int slot)
134{
135
136	KASSERT(l != NULL, ("mac_label_get: NULL label"));
137
138	return (l->l_perpolicy[slot]);
139}
140
141void
142mac_label_set(struct label *l, int slot, intptr_t v)
143{
144
145	KASSERT(l != NULL, ("mac_label_set: NULL label"));
146
147	l->l_perpolicy[slot] = v;
148}
149