mac_internal.h revision 162383
1/*- 2 * Copyright (c) 1999-2002 Robert N. M. Watson 3 * Copyright (c) 2001 Ilmar S. Habibulin 4 * Copyright (c) 2001-2004 Networks Associates Technology, Inc. 5 * All rights reserved. 6 * 7 * This software was developed by Robert Watson and Ilmar Habibulin for the 8 * TrustedBSD Project. 9 * 10 * This software was developed for the FreeBSD Project in part by Network 11 * Associates Laboratories, the Security Research Division of Network 12 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), 13 * as part of the DARPA CHATS research program. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * $FreeBSD: head/sys/security/mac/mac_internal.h 162383 2006-09-17 20:00:36Z rwatson $ 37 */ 38 39/* 40 * MAC Framework sysctl namespace. 41 */ 42#ifdef SYSCTL_DECL 43SYSCTL_DECL(_security_mac); 44#ifdef MAC_DEBUG 45SYSCTL_DECL(_security_mac_debug); 46SYSCTL_DECL(_security_mac_debug_counters); 47#endif 48#endif /* SYSCTL_DECL */ 49 50/* 51 * MAC Framework global types and typedefs. 52 */ 53LIST_HEAD(mac_policy_list_head, mac_policy_conf); 54#ifdef MALLOC_DECLARE 55MALLOC_DECLARE(M_MACTEMP); 56#endif 57 58/* 59 * MAC Framework global variables. 60 */ 61extern struct mac_policy_list_head mac_policy_list; 62extern struct mac_policy_list_head mac_static_policy_list; 63extern int mac_late; 64extern int mac_enforce_network; 65extern int mac_enforce_process; 66extern int mac_enforce_socket; 67extern int mac_enforce_vm; 68#ifndef MAC_ALWAYS_LABEL_MBUF 69extern int mac_labelmbufs; 70#endif 71 72/* 73 * MAC Framework object/access counter primitives, conditionally 74 * compiled. 75 */ 76#ifdef MAC_DEBUG 77#define MAC_DEBUG_COUNTER_INC(x) atomic_add_int(x, 1); 78#define MAC_DEBUG_COUNTER_DEC(x) atomic_subtract_int(x, 1); 79#else 80#define MAC_DEBUG_COUNTER_INC(x) 81#define MAC_DEBUG_COUNTER_DEC(x) 82#endif 83 84/* 85 * MAC Framework infrastructure functions. 86 */ 87int mac_error_select(int error1, int error2); 88 89void mac_policy_grab_exclusive(void); 90void mac_policy_assert_exclusive(void); 91void mac_policy_release_exclusive(void); 92void mac_policy_list_busy(void); 93int mac_policy_list_conditional_busy(void); 94void mac_policy_list_unbusy(void); 95 96struct label *mac_labelzone_alloc(int flags); 97void mac_labelzone_free(struct label *label); 98void mac_labelzone_init(void); 99 100void mac_init_label(struct label *label); 101void mac_destroy_label(struct label *label); 102int mac_check_structmac_consistent(struct mac *mac); 103int mac_allocate_slot(void); 104 105/* 106 * MAC Framework per-object type functions. It's not yet clear how 107 * the namespaces, etc, should work for these, so for now, sort by 108 * object type. 109 */ 110struct label *mac_pipe_label_alloc(void); 111void mac_pipe_label_free(struct label *label); 112struct label *mac_socket_label_alloc(int flag); 113void mac_socket_label_free(struct label *label); 114 115int mac_check_cred_relabel(struct ucred *cred, struct label *newlabel); 116int mac_externalize_cred_label(struct label *label, char *elements, 117 char *outbuf, size_t outbuflen); 118int mac_internalize_cred_label(struct label *label, char *string); 119void mac_relabel_cred(struct ucred *cred, struct label *newlabel); 120 121struct label *mac_mbuf_to_label(struct mbuf *m); 122 123void mac_copy_pipe_label(struct label *src, struct label *dest); 124int mac_externalize_pipe_label(struct label *label, char *elements, 125 char *outbuf, size_t outbuflen); 126int mac_internalize_pipe_label(struct label *label, char *string); 127 128int mac_socket_label_set(struct ucred *cred, struct socket *so, 129 struct label *label); 130void mac_copy_socket_label(struct label *src, struct label *dest); 131int mac_externalize_socket_label(struct label *label, char *elements, 132 char *outbuf, size_t outbuflen); 133int mac_internalize_socket_label(struct label *label, char *string); 134 135int mac_externalize_vnode_label(struct label *label, char *elements, 136 char *outbuf, size_t outbuflen); 137int mac_internalize_vnode_label(struct label *label, char *string); 138void mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, 139 int *prot); 140int vn_setlabel(struct vnode *vp, struct label *intlabel, 141 struct ucred *cred); 142 143/* 144 * MAC_CHECK performs the designated check by walking the policy module 145 * list and checking with each as to how it feels about the request. 146 * Note that it returns its value via 'error' in the scope of the caller. 147 */ 148#define MAC_CHECK(check, args...) do { \ 149 struct mac_policy_conf *mpc; \ 150 int entrycount; \ 151 \ 152 error = 0; \ 153 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ 154 if (mpc->mpc_ops->mpo_ ## check != NULL) \ 155 error = mac_error_select( \ 156 mpc->mpc_ops->mpo_ ## check (args), \ 157 error); \ 158 } \ 159 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ 160 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 161 if (mpc->mpc_ops->mpo_ ## check != NULL) \ 162 error = mac_error_select( \ 163 mpc->mpc_ops->mpo_ ## check (args), \ 164 error); \ 165 } \ 166 mac_policy_list_unbusy(); \ 167 } \ 168} while (0) 169 170/* 171 * MAC_BOOLEAN performs the designated boolean composition by walking 172 * the module list, invoking each instance of the operation, and 173 * combining the results using the passed C operator. Note that it 174 * returns its value via 'result' in the scope of the caller, which 175 * should be initialized by the caller in a meaningful way to get 176 * a meaningful result. 177 */ 178#define MAC_BOOLEAN(operation, composition, args...) do { \ 179 struct mac_policy_conf *mpc; \ 180 int entrycount; \ 181 \ 182 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ 183 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 184 result = result composition \ 185 mpc->mpc_ops->mpo_ ## operation (args); \ 186 } \ 187 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ 188 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 189 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 190 result = result composition \ 191 mpc->mpc_ops->mpo_ ## operation \ 192 (args); \ 193 } \ 194 mac_policy_list_unbusy(); \ 195 } \ 196} while (0) 197 198#define MAC_EXTERNALIZE(type, label, elementlist, outbuf, \ 199 outbuflen) do { \ 200 int claimed, first, ignorenotfound, savedlen; \ 201 char *element_name, *element_temp; \ 202 struct sbuf sb; \ 203 \ 204 error = 0; \ 205 first = 1; \ 206 sbuf_new(&sb, outbuf, outbuflen, SBUF_FIXEDLEN); \ 207 element_temp = elementlist; \ 208 while ((element_name = strsep(&element_temp, ",")) != NULL) { \ 209 if (element_name[0] == '?') { \ 210 element_name++; \ 211 ignorenotfound = 1; \ 212 } else \ 213 ignorenotfound = 0; \ 214 savedlen = sbuf_len(&sb); \ 215 if (first) \ 216 error = sbuf_printf(&sb, "%s/", element_name); \ 217 else \ 218 error = sbuf_printf(&sb, ",%s/", element_name); \ 219 if (error == -1) { \ 220 error = EINVAL; /* XXX: E2BIG? */ \ 221 break; \ 222 } \ 223 claimed = 0; \ 224 MAC_CHECK(externalize_ ## type ## _label, label, \ 225 element_name, &sb, &claimed); \ 226 if (error) \ 227 break; \ 228 if (claimed == 0 && ignorenotfound) { \ 229 /* Revert last label name. */ \ 230 sbuf_setpos(&sb, savedlen); \ 231 } else if (claimed != 1) { \ 232 error = EINVAL; /* XXX: ENOLABEL? */ \ 233 break; \ 234 } else { \ 235 first = 0; \ 236 } \ 237 } \ 238 sbuf_finish(&sb); \ 239} while (0) 240 241#define MAC_INTERNALIZE(type, label, instring) do { \ 242 char *element, *element_name, *element_data; \ 243 int claimed; \ 244 \ 245 error = 0; \ 246 element = instring; \ 247 while ((element_name = strsep(&element, ",")) != NULL) { \ 248 element_data = element_name; \ 249 element_name = strsep(&element_data, "/"); \ 250 if (element_data == NULL) { \ 251 error = EINVAL; \ 252 break; \ 253 } \ 254 claimed = 0; \ 255 MAC_CHECK(internalize_ ## type ## _label, label, \ 256 element_name, element_data, &claimed); \ 257 if (error) \ 258 break; \ 259 if (claimed != 1) { \ 260 /* XXXMAC: Another error here? */ \ 261 error = EINVAL; \ 262 break; \ 263 } \ 264 } \ 265} while (0) 266 267/* 268 * MAC_PERFORM performs the designated operation by walking the policy 269 * module list and invoking that operation for each policy. 270 */ 271#define MAC_PERFORM(operation, args...) do { \ 272 struct mac_policy_conf *mpc; \ 273 int entrycount; \ 274 \ 275 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ 276 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 277 mpc->mpc_ops->mpo_ ## operation (args); \ 278 } \ 279 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ 280 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 281 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 282 mpc->mpc_ops->mpo_ ## operation (args); \ 283 } \ 284 mac_policy_list_unbusy(); \ 285 } \ 286} while (0) 287