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 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 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 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 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 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 * 116 mac_labelzone_alloc(int flags) 117 { 118 119 return (uma_zalloc(zone_label, flags)); 120 } 121 122 void 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 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 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