Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/security/mac/mac_internal.h
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1 /*- 2 * Copyright (c) 1999-2002, 2006 Robert N. M. Watson 3 * Copyright (c) 2001 Ilmar S. Habibulin 4 * Copyright (c) 2001-2004 Networks Associates Technology, Inc. 5 * Copyright (c) 2006 nCircle Network Security, Inc. 6 * All rights reserved. 7 * 8 * This software was developed by Robert Watson and Ilmar Habibulin for the 9 * TrustedBSD Project. 10 * 11 * This software was developed for the FreeBSD Project in part by Network 12 * Associates Laboratories, the Security Research Division of Network 13 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), 14 * as part of the DARPA CHATS research program. 15 * 16 * This software was developed by Robert N. M. Watson for the TrustedBSD 17 * Project under contract to nCircle Network Security, Inc. 18 * 19 * Redistribution and use in source and binary forms, with or without 20 * modification, are permitted provided that the following conditions 21 * are met: 22 * 1. Redistributions of source code must retain the above copyright 23 * notice, this list of conditions and the following disclaimer. 24 * 2. Redistributions in binary form must reproduce the above copyright 25 * notice, this list of conditions and the following disclaimer in the 26 * documentation and/or other materials provided with the distribution. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * $FreeBSD$ 41 */ 42 43 #ifndef _SECURITY_MAC_MAC_INTERNAL_H_ 44 #define _SECURITY_MAC_MAC_INTERNAL_H_ 45 46 #ifndef _KERNEL 47 #error "no user-serviceable parts inside" 48 #endif 49 50 /* 51 * MAC Framework sysctl namespace. 52 */ 53 #ifdef SYSCTL_DECL 54 SYSCTL_DECL(_security_mac); 55 #endif /* SYSCTL_DECL */ 56 57 /* 58 * MAC Framework global types and typedefs. 59 */ 60 LIST_HEAD(mac_policy_list_head, mac_policy_conf); 61 #ifdef MALLOC_DECLARE 62 MALLOC_DECLARE(M_MACTEMP); 63 #endif 64 65 /* 66 * MAC labels -- in-kernel storage format. 67 * 68 * In general, struct label pointers are embedded in kernel data structures 69 * representing objects that may be labeled (and protected). Struct label is 70 * opaque to both kernel services that invoke the MAC Framework and MAC 71 * policy modules. In particular, we do not wish to encode the layout of the 72 * label structure into any ABIs. Historically, the slot array contained 73 * unions of {long, void} but now contains uintptr_t. 74 */ 75 #define MAC_MAX_SLOTS 4 76 #define MAC_FLAG_INITIALIZED 0x0000001 /* Is initialized for use. */ 77 struct label { 78 int l_flags; 79 intptr_t l_perpolicy[MAC_MAX_SLOTS]; 80 }; 81 82 /* 83 * MAC Framework global variables. 84 */ 85 extern struct mac_policy_list_head mac_policy_list; 86 extern struct mac_policy_list_head mac_static_policy_list; 87 #ifndef MAC_ALWAYS_LABEL_MBUF 88 extern int mac_labelmbufs; 89 #endif 90 91 /* 92 * MAC Framework infrastructure functions. 93 */ 94 int mac_error_select(int error1, int error2); 95 96 void mac_policy_grab_exclusive(void); 97 void mac_policy_assert_exclusive(void); 98 void mac_policy_release_exclusive(void); 99 void mac_policy_list_busy(void); 100 int mac_policy_list_conditional_busy(void); 101 void mac_policy_list_unbusy(void); 102 103 struct label *mac_labelzone_alloc(int flags); 104 void mac_labelzone_free(struct label *label); 105 void mac_labelzone_init(void); 106 107 void mac_init_label(struct label *label); 108 void mac_destroy_label(struct label *label); 109 int mac_check_structmac_consistent(struct mac *mac); 110 int mac_allocate_slot(void); 111 112 /* 113 * MAC Framework per-object type functions. It's not yet clear how the 114 * namespaces, etc, should work for these, so for now, sort by object type. 115 */ 116 struct label *mac_pipe_label_alloc(void); 117 void mac_pipe_label_free(struct label *label); 118 struct label *mac_socket_label_alloc(int flag); 119 void mac_socket_label_free(struct label *label); 120 121 int mac_check_cred_relabel(struct ucred *cred, struct label *newlabel); 122 int mac_externalize_cred_label(struct label *label, char *elements, 123 char *outbuf, size_t outbuflen); 124 int mac_internalize_cred_label(struct label *label, char *string); 125 void mac_relabel_cred(struct ucred *cred, struct label *newlabel); 126 127 struct label *mac_mbuf_to_label(struct mbuf *m); 128 129 void mac_copy_pipe_label(struct label *src, struct label *dest); 130 int mac_externalize_pipe_label(struct label *label, char *elements, 131 char *outbuf, size_t outbuflen); 132 int mac_internalize_pipe_label(struct label *label, char *string); 133 134 int mac_socket_label_set(struct ucred *cred, struct socket *so, 135 struct label *label); 136 void mac_copy_socket_label(struct label *src, struct label *dest); 137 int mac_externalize_socket_label(struct label *label, char *elements, 138 char *outbuf, size_t outbuflen); 139 int mac_internalize_socket_label(struct label *label, char *string); 140 141 int mac_externalize_vnode_label(struct label *label, char *elements, 142 char *outbuf, size_t outbuflen); 143 int mac_internalize_vnode_label(struct label *label, char *string); 144 void mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, 145 int *prot); 146 int vn_setlabel(struct vnode *vp, struct label *intlabel, 147 struct ucred *cred); 148 149 /* 150 * MAC_CHECK performs the designated check by walking the policy module list 151 * and checking with each as to how it feels about the request. Note that it 152 * returns its value via 'error' in the scope of the caller. 153 */ 154 #define MAC_CHECK(check, args...) do { \ 155 struct mac_policy_conf *mpc; \ 156 int entrycount; \ 157 \ 158 error = 0; \ 159 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ 160 if (mpc->mpc_ops->mpo_ ## check != NULL) \ 161 error = mac_error_select( \ 162 mpc->mpc_ops->mpo_ ## check (args), \ 163 error); \ 164 } \ 165 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ 166 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 167 if (mpc->mpc_ops->mpo_ ## check != NULL) \ 168 error = mac_error_select( \ 169 mpc->mpc_ops->mpo_ ## check (args), \ 170 error); \ 171 } \ 172 mac_policy_list_unbusy(); \ 173 } \ 174 } while (0) 175 176 /* 177 * MAC_GRANT performs the designated check by walking the policy module list 178 * and checking with each as to how it feels about the request. Unlike 179 * MAC_CHECK, it grants if any policies return '', and otherwise returns 180 * EPERM. Note that it returns its value via 'error' in the scope of the 181 * caller. 182 */ 183 #define MAC_GRANT(check, args...) do { \ 184 struct mac_policy_conf *mpc; \ 185 int entrycount; \ 186 \ 187 error = EPERM; \ 188 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ 189 if (mpc->mpc_ops->mpo_ ## check != NULL) { \ 190 if (mpc->mpc_ops->mpo_ ## check(args) == 0) \ 191 error = 0; \ 192 } \ 193 } \ 194 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ 195 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 196 if (mpc->mpc_ops->mpo_ ## check != NULL) { \ 197 if (mpc->mpc_ops->mpo_ ## check (args) \ 198 == 0) \ 199 error = 0; \ 200 } \ 201 } \ 202 mac_policy_list_unbusy(); \ 203 } \ 204 } while (0) 205 206 /* 207 * MAC_BOOLEAN performs the designated boolean composition by walking the 208 * module list, invoking each instance of the operation, and combining the 209 * results using the passed C operator. Note that it returns its value via 210 * 'result' in the scope of the caller, which should be initialized by the 211 * caller in a meaningful way to get a meaningful result. 212 */ 213 #define MAC_BOOLEAN(operation, composition, args...) do { \ 214 struct mac_policy_conf *mpc; \ 215 int entrycount; \ 216 \ 217 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ 218 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 219 result = result composition \ 220 mpc->mpc_ops->mpo_ ## operation (args); \ 221 } \ 222 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ 223 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 224 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 225 result = result composition \ 226 mpc->mpc_ops->mpo_ ## operation \ 227 (args); \ 228 } \ 229 mac_policy_list_unbusy(); \ 230 } \ 231 } while (0) 232 233 /* 234 * MAC_EXTERNALIZE queries each policy to see if it can generate an 235 * externalized version of a label element by name. Policies declare whether 236 * they have matched a particular element name, parsed from the string by 237 * MAC_EXTERNALIZE, and an error is returned if any element is matched by no 238 * policy. 239 */ 240 #define MAC_EXTERNALIZE(type, label, elementlist, outbuf, \ 241 outbuflen) do { \ 242 int claimed, first, ignorenotfound, savedlen; \ 243 char *element_name, *element_temp; \ 244 struct sbuf sb; \ 245 \ 246 error = 0; \ 247 first = 1; \ 248 sbuf_new(&sb, outbuf, outbuflen, SBUF_FIXEDLEN); \ 249 element_temp = elementlist; \ 250 while ((element_name = strsep(&element_temp, ",")) != NULL) { \ 251 if (element_name[0] == '?') { \ 252 element_name++; \ 253 ignorenotfound = 1; \ 254 } else \ 255 ignorenotfound = 0; \ 256 savedlen = sbuf_len(&sb); \ 257 if (first) \ 258 error = sbuf_printf(&sb, "%s/", element_name); \ 259 else \ 260 error = sbuf_printf(&sb, ",%s/", element_name); \ 261 if (error == -1) { \ 262 error = EINVAL; /* XXX: E2BIG? */ \ 263 break; \ 264 } \ 265 claimed = 0; \ 266 MAC_CHECK(externalize_ ## type ## _label, label, \ 267 element_name, &sb, &claimed); \ 268 if (error) \ 269 break; \ 270 if (claimed == 0 && ignorenotfound) { \ 271 /* Revert last label name. */ \ 272 sbuf_setpos(&sb, savedlen); \ 273 } else if (claimed != 1) { \ 274 error = EINVAL; /* XXX: ENOLABEL? */ \ 275 break; \ 276 } else { \ 277 first = 0; \ 278 } \ 279 } \ 280 sbuf_finish(&sb); \ 281 } while (0) 282 283 /* 284 * MAC_INTERNALIZE presents parsed element names and data to each policy to 285 * see if any is willing to claim it and internalize the label data. If no 286 * policies match, an error is returned. 287 */ 288 #define MAC_INTERNALIZE(type, label, instring) do { \ 289 char *element, *element_name, *element_data; \ 290 int claimed; \ 291 \ 292 error = 0; \ 293 element = instring; \ 294 while ((element_name = strsep(&element, ",")) != NULL) { \ 295 element_data = element_name; \ 296 element_name = strsep(&element_data, "/"); \ 297 if (element_data == NULL) { \ 298 error = EINVAL; \ 299 break; \ 300 } \ 301 claimed = 0; \ 302 MAC_CHECK(internalize_ ## type ## _label, label, \ 303 element_name, element_data, &claimed); \ 304 if (error) \ 305 break; \ 306 if (claimed != 1) { \ 307 /* XXXMAC: Another error here? */ \ 308 error = EINVAL; \ 309 break; \ 310 } \ 311 } \ 312 } while (0) 313 314 /* 315 * MAC_PERFORM performs the designated operation by walking the policy module 316 * list and invoking that operation for each policy. 317 */ 318 #define MAC_PERFORM(operation, args...) do { \ 319 struct mac_policy_conf *mpc; \ 320 int entrycount; \ 321 \ 322 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ 323 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 324 mpc->mpc_ops->mpo_ ## operation (args); \ 325 } \ 326 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ 327 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 328 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 329 mpc->mpc_ops->mpo_ ## operation (args); \ 330 } \ 331 mac_policy_list_unbusy(); \ 332 } \ 333 } while (0) 334 335 #endif /* !_SECURITY_MAC_MAC_INTERNAL_H_ */
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