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__FBSDID("$FreeBSD$");
35
36#include "opt_mac.h"
37
38#include <sys/param.h>
39#include <sys/module.h>
40#include <sys/sysctl.h>
41#include <sys/systm.h>
42
43#include <vm/uma.h>
44
45#include <security/mac/mac_framework.h>
46#include <security/mac/mac_internal.h>
47#include <security/mac/mac_policy.h>
48
49/*
50 * zone_label is the UMA zone from which most labels are allocated.  Label
51 * structures are initialized to zero bytes so that policies see a NULL/0
52 * slot on first use, even if the policy is loaded after the label is
53 * allocated for an object.
54 */
55static uma_zone_t	zone_label;
56
57static int	mac_labelzone_ctor(void *mem, int size, void *arg, int flags);
58static void	mac_labelzone_dtor(void *mem, int size, void *arg);
59
60void
61mac_labelzone_init(void)
62{
63
64	zone_label = uma_zcreate("MAC labels", sizeof(struct label),
65	    mac_labelzone_ctor, mac_labelzone_dtor, NULL, NULL,
66	    UMA_ALIGN_PTR, 0);
67}
68
69/*
70 * mac_init_label() and mac_destroy_label() are exported so that they can be
71 * used in mbuf tag initialization, where labels are not slab allocated from
72 * the zone_label zone.
73 */
74void
75mac_init_label(struct label *label)
76{
77
78	bzero(label, sizeof(*label));
79	label->l_flags = MAC_FLAG_INITIALIZED;
80}
81
82void
83mac_destroy_label(struct label *label)
84{
85
86	KASSERT(label->l_flags & MAC_FLAG_INITIALIZED,
87	    ("destroying uninitialized label"));
88
89#ifdef DIAGNOSTIC
90	bzero(label, sizeof(*label));
91#else
92	label->l_flags &= ~MAC_FLAG_INITIALIZED;
93#endif
94}
95
96
97static int
98mac_labelzone_ctor(void *mem, int size, void *arg, int flags)
99{
100	struct label *label;
101
102	KASSERT(size == sizeof(*label), ("mac_labelzone_ctor: wrong size\n"));
103	label = mem;
104	mac_init_label(label);
105	return (0);
106}
107
108static void
109mac_labelzone_dtor(void *mem, int size, void *arg)
110{
111	struct label *label;
112
113	KASSERT(size == sizeof(*label), ("mac_labelzone_dtor: wrong size\n"));
114	label = mem;
115	mac_destroy_label(label);
116}
117
118struct label *
119mac_labelzone_alloc(int flags)
120{
121
122	return (uma_zalloc(zone_label, flags));
123}
124
125void
126mac_labelzone_free(struct label *label)
127{
128
129	uma_zfree(zone_label, label);
130}
131
132/*
133 * Functions used by policy modules to get and set label values.
134 */
135intptr_t
136mac_label_get(struct label *l, int slot)
137{
138
139	KASSERT(l != NULL, ("mac_label_get: NULL label"));
140
141	return (l->l_perpolicy[slot]);
142}
143
144void
145mac_label_set(struct label *l, int slot, intptr_t v)
146{
147
148	KASSERT(l != NULL, ("mac_label_set: NULL label"));
149
150	l->l_perpolicy[slot] = v;
151}
152