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 */
53 static uma_zone_t zone_label;
54
55 static int mac_labelzone_ctor(void *mem, int size, void *arg, int flags);
56 static void mac_labelzone_dtor(void *mem, int size, void *arg);
57
58 void
mac_labelzone_init(void)59 mac_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 */
72 void
mac_init_label(struct label * label)73 mac_init_label(struct label *label)
74 {
75
76 bzero(label, sizeof(*label));
77 label->l_flags = MAC_FLAG_INITIALIZED;
78 }
79
80 void
mac_destroy_label(struct label * label)81 mac_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
94 static int
mac_labelzone_ctor(void * mem,int size,void * arg,int flags)95 mac_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
105 static void
mac_labelzone_dtor(void * mem,int size,void * arg)106 mac_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
115 struct label *
mac_labelzone_alloc(int flags)116 mac_labelzone_alloc(int flags)
117 {
118
119 return (uma_zalloc(zone_label, flags));
120 }
121
122 void
mac_labelzone_free(struct label * label)123 mac_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 */
132 intptr_t
mac_label_get(struct label * l,int slot)133 mac_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
141 void
mac_label_set(struct label * l,int slot,intptr_t v)142 mac_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