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 */ 55 static uma_zone_t zone_label; 56 57 static int mac_labelzone_ctor(void *mem, int size, void *arg, int flags); 58 static void mac_labelzone_dtor(void *mem, int size, void *arg); 59 60 void 61 mac_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 */ 74 void 75 mac_init_label(struct label *label) 76 { 77 78 bzero(label, sizeof(*label)); 79 label->l_flags = MAC_FLAG_INITIALIZED; 80 } 81 82 void 83 mac_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 97 static int 98 mac_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 } 107 108 static void 109 mac_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 } 117 118 struct label * 119 mac_labelzone_alloc(int flags) 120 { 121 122 return (uma_zalloc(zone_label, flags)); 123 } 124 125 void 126 mac_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 */ 135 intptr_t 136 mac_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 } 143 144 void 145 mac_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