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 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: releng/5.4/sys/security/mac/mac_internal.h 140976 2005-01-29 20:18:32Z rwatson $ 37 */ 38 39 /* 40 * MAC Framework sysctl namespace. 41 */ 42 #ifdef SYSCTL_DECL 43 SYSCTL_DECL(_security); 44 SYSCTL_DECL(_security_mac); 45 #ifdef MAC_DEBUG 46 SYSCTL_DECL(_security_mac_debug); 47 SYSCTL_DECL(_security_mac_debug_counters); 48 #endif 49 #endif /* SYSCTL_DECL */ 50 51 /* 52 * MAC Framework global types and typedefs. 53 */ 54 LIST_HEAD(mac_policy_list_head, mac_policy_conf); 55 #ifdef MALLOC_DECLARE 56 MALLOC_DECLARE(M_MACTEMP); 57 #endif 58 59 /* 60 * MAC Framework global variables. 61 */ 62 extern struct mac_policy_list_head mac_policy_list; 63 extern struct mac_policy_list_head mac_static_policy_list; 64 extern int mac_late; 65 extern int mac_enforce_network; 66 extern int mac_enforce_process; 67 extern int mac_enforce_socket; 68 extern int mac_enforce_vm; 69 #ifndef MAC_ALWAYS_LABEL_MBUF 70 extern int mac_labelmbufs; 71 #endif 72 73 /* 74 * MAC Framework object/access counter primitives, conditionally 75 * compiled. 76 */ 77 #ifdef MAC_DEBUG 78 #define MAC_DEBUG_COUNTER_INC(x) atomic_add_int(x, 1); 79 #define MAC_DEBUG_COUNTER_DEC(x) atomic_subtract_int(x, 1); 80 #else 81 #define MAC_DEBUG_COUNTER_INC(x) 82 #define MAC_DEBUG_COUNTER_DEC(x) 83 #endif 84 85 /* 86 * MAC Framework infrastructure functions. 87 */ 88 int mac_error_select(int error1, int error2); 89 90 void mac_policy_grab_exclusive(void); 91 void mac_policy_assert_exclusive(void); 92 void mac_policy_release_exclusive(void); 93 void mac_policy_list_busy(void); 94 int mac_policy_list_conditional_busy(void); 95 void mac_policy_list_unbusy(void); 96 97 struct label *mac_labelzone_alloc(int flags); 98 void mac_labelzone_free(struct label *label); 99 void mac_labelzone_init(void); 100 101 void mac_init_label(struct label *label); 102 void mac_destroy_label(struct label *label); 103 int mac_check_structmac_consistent(struct mac *mac); 104 int mac_allocate_slot(void); 105 106 /* 107 * MAC Framework per-object type functions. It's not yet clear how 108 * the namespaces, etc, should work for these, so for now, sort by 109 * object type. 110 */ 111 struct label *mac_pipe_label_alloc(void); 112 void mac_pipe_label_free(struct label *label); 113 struct label *mac_socket_label_alloc(int flag); 114 void mac_socket_label_free(struct label *label); 115 116 int mac_check_cred_relabel(struct ucred *cred, struct label *newlabel); 117 int mac_externalize_cred_label(struct label *label, char *elements, 118 char *outbuf, size_t outbuflen); 119 int mac_internalize_cred_label(struct label *label, char *string); 120 void mac_relabel_cred(struct ucred *cred, struct label *newlabel); 121 122 struct label *mac_mbuf_to_label(struct mbuf *m); 123 124 void mac_copy_pipe_label(struct label *src, struct label *dest); 125 int mac_externalize_pipe_label(struct label *label, char *elements, 126 char *outbuf, size_t outbuflen); 127 int mac_internalize_pipe_label(struct label *label, char *string); 128 129 int mac_socket_label_set(struct ucred *cred, struct socket *so, 130 struct label *label); 131 void mac_copy_socket_label(struct label *src, struct label *dest); 132 int mac_externalize_socket_label(struct label *label, char *elements, 133 char *outbuf, size_t outbuflen); 134 int mac_internalize_socket_label(struct label *label, char *string); 135 136 int mac_externalize_vnode_label(struct label *label, char *elements, 137 char *outbuf, size_t outbuflen); 138 int mac_internalize_vnode_label(struct label *label, char *string); 139 void mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, 140 int *prot); 141 int vn_setlabel(struct vnode *vp, struct label *intlabel, 142 struct ucred *cred); 143 144 /* 145 * MAC_CHECK performs the designated check by walking the policy module 146 * list and checking with each as to how it feels about the request. 147 * Note that it returns its value via 'error' in the scope of the caller. 148 */ 149 #define MAC_CHECK(check, args...) do { \ 150 struct mac_policy_conf *mpc; \ 151 int entrycount; \ 152 \ 153 error = 0; \ 154 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ 155 if (mpc->mpc_ops->mpo_ ## check != NULL) \ 156 error = mac_error_select( \ 157 mpc->mpc_ops->mpo_ ## check (args), \ 158 error); \ 159 } \ 160 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ 161 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 162 if (mpc->mpc_ops->mpo_ ## check != NULL) \ 163 error = mac_error_select( \ 164 mpc->mpc_ops->mpo_ ## check (args), \ 165 error); \ 166 } \ 167 mac_policy_list_unbusy(); \ 168 } \ 169 } while (0) 170 171 /* 172 * MAC_BOOLEAN performs the designated boolean composition by walking 173 * the module list, invoking each instance of the operation, and 174 * combining the results using the passed C operator. Note that it 175 * returns its value via 'result' in the scope of the caller, which 176 * should be initialized by the caller in a meaningful way to get 177 * a meaningful result. 178 */ 179 #define MAC_BOOLEAN(operation, composition, args...) do { \ 180 struct mac_policy_conf *mpc; \ 181 int entrycount; \ 182 \ 183 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ 184 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 185 result = result composition \ 186 mpc->mpc_ops->mpo_ ## operation (args); \ 187 } \ 188 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ 189 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 190 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 191 result = result composition \ 192 mpc->mpc_ops->mpo_ ## operation \ 193 (args); \ 194 } \ 195 mac_policy_list_unbusy(); \ 196 } \ 197 } while (0) 198 199 #define MAC_EXTERNALIZE(type, label, elementlist, outbuf, \ 200 outbuflen) do { \ 201 int claimed, first, ignorenotfound, savedlen; \ 202 char *element_name, *element_temp; \ 203 struct sbuf sb; \ 204 \ 205 error = 0; \ 206 first = 1; \ 207 sbuf_new(&sb, outbuf, outbuflen, SBUF_FIXEDLEN); \ 208 element_temp = elementlist; \ 209 while ((element_name = strsep(&element_temp, ",")) != NULL) { \ 210 if (element_name[0] == '?') { \ 211 element_name++; \ 212 ignorenotfound = 1; \ 213 } else \ 214 ignorenotfound = 0; \ 215 savedlen = sbuf_len(&sb); \ 216 if (first) \ 217 error = sbuf_printf(&sb, "%s/", element_name); \ 218 else \ 219 error = sbuf_printf(&sb, ",%s/", element_name); \ 220 if (error == -1) { \ 221 error = EINVAL; /* XXX: E2BIG? */ \ 222 break; \ 223 } \ 224 claimed = 0; \ 225 MAC_CHECK(externalize_ ## type ## _label, label, \ 226 element_name, &sb, &claimed); \ 227 if (error) \ 228 break; \ 229 if (claimed == 0 && ignorenotfound) { \ 230 /* Revert last label name. */ \ 231 sbuf_setpos(&sb, savedlen); \ 232 } else if (claimed != 1) { \ 233 error = EINVAL; /* XXX: ENOLABEL? */ \ 234 break; \ 235 } else { \ 236 first = 0; \ 237 } \ 238 } \ 239 sbuf_finish(&sb); \ 240 } while (0) 241 242 #define MAC_INTERNALIZE(type, label, instring) do { \ 243 char *element, *element_name, *element_data; \ 244 int claimed; \ 245 \ 246 error = 0; \ 247 element = instring; \ 248 while ((element_name = strsep(&element, ",")) != NULL) { \ 249 element_data = element_name; \ 250 element_name = strsep(&element_data, "/"); \ 251 if (element_data == NULL) { \ 252 error = EINVAL; \ 253 break; \ 254 } \ 255 claimed = 0; \ 256 MAC_CHECK(internalize_ ## type ## _label, label, \ 257 element_name, element_data, &claimed); \ 258 if (error) \ 259 break; \ 260 if (claimed != 1) { \ 261 /* XXXMAC: Another error here? */ \ 262 error = EINVAL; \ 263 break; \ 264 } \ 265 } \ 266 } while (0) 267 268 /* 269 * MAC_PERFORM performs the designated operation by walking the policy 270 * module list and invoking that operation for each policy. 271 */ 272 #define MAC_PERFORM(operation, args...) do { \ 273 struct mac_policy_conf *mpc; \ 274 int entrycount; \ 275 \ 276 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ 277 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 278 mpc->mpc_ops->mpo_ ## operation (args); \ 279 } \ 280 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ 281 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 282 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 283 mpc->mpc_ops->mpo_ ## operation (args); \ 284 } \ 285 mac_policy_list_unbusy(); \ 286 } \ 287 } while (0)
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