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, 2000, 2001, 2002 Robert N. M. Watson 3 * Copyright (c) 2001 Ilmar S. Habibulin 4 * Copyright (c) 2001, 2002, 2003 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/5.2/sys/security/mac/mac_internal.h 122820 2003-11-16 23:31:45Z 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_process; 66 extern int mac_enforce_sysv; 67 extern int mac_enforce_vm; 68 #ifndef MAC_ALWAYS_LABEL_MBUF 69 extern 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 */ 87 int mac_error_select(int error1, int error2); 88 89 void mac_policy_grab_exclusive(void); 90 void mac_policy_assert_exclusive(void); 91 void mac_policy_release_exclusive(void); 92 void mac_policy_list_busy(void); 93 int mac_policy_list_conditional_busy(void); 94 void mac_policy_list_unbusy(void); 95 96 struct label *mac_labelzone_alloc(int flags); 97 void mac_labelzone_free(struct label *label); 98 void mac_labelzone_init(void); 99 100 void mac_init_label(struct label *label); 101 void mac_destroy_label(struct label *label); 102 int mac_check_structmac_consistent(struct mac *mac); 103 int 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 */ 110 struct label *mac_pipe_label_alloc(void); 111 void mac_pipe_label_free(struct label *label); 112 struct label *mac_socket_label_alloc(int flag); 113 void mac_socket_label_free(struct label *label); 114 115 int mac_check_cred_relabel(struct ucred *cred, struct label *newlabel); 116 int mac_externalize_cred_label(struct label *label, char *elements, 117 char *outbuf, size_t outbuflen); 118 int mac_internalize_cred_label(struct label *label, char *string); 119 void mac_relabel_cred(struct ucred *cred, struct label *newlabel); 120 121 void mac_copy_pipe_label(struct label *src, struct label *dest); 122 int mac_externalize_pipe_label(struct label *label, char *elements, 123 char *outbuf, size_t outbuflen); 124 int mac_internalize_pipe_label(struct label *label, char *string); 125 126 int mac_socket_label_set(struct ucred *cred, struct socket *so, 127 struct label *label); 128 void mac_copy_socket_label(struct label *src, struct label *dest); 129 int mac_externalize_socket_label(struct label *label, char *elements, 130 char *outbuf, size_t outbuflen); 131 int mac_internalize_socket_label(struct label *label, char *string); 132 133 int mac_externalize_vnode_label(struct label *label, char *elements, 134 char *outbuf, size_t outbuflen); 135 int mac_internalize_vnode_label(struct label *label, char *string); 136 void mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, 137 int *prot); 138 int vn_setlabel(struct vnode *vp, struct label *intlabel, 139 struct ucred *cred); 140 141 /* 142 * MAC_CHECK performs the designated check by walking the policy module 143 * list and checking with each as to how it feels about the request. 144 * Note that it returns its value via 'error' in the scope of the caller. 145 */ 146 #define MAC_CHECK(check, args...) do { \ 147 struct mac_policy_conf *mpc; \ 148 int entrycount; \ 149 \ 150 error = 0; \ 151 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ 152 if (mpc->mpc_ops->mpo_ ## check != NULL) \ 153 error = mac_error_select( \ 154 mpc->mpc_ops->mpo_ ## check (args), \ 155 error); \ 156 } \ 157 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ 158 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 159 if (mpc->mpc_ops->mpo_ ## check != NULL) \ 160 error = mac_error_select( \ 161 mpc->mpc_ops->mpo_ ## check (args), \ 162 error); \ 163 } \ 164 mac_policy_list_unbusy(); \ 165 } \ 166 } while (0) 167 168 /* 169 * MAC_BOOLEAN performs the designated boolean composition by walking 170 * the module list, invoking each instance of the operation, and 171 * combining the results using the passed C operator. Note that it 172 * returns its value via 'result' in the scope of the caller, which 173 * should be initialized by the caller in a meaningful way to get 174 * a meaningful result. 175 */ 176 #define MAC_BOOLEAN(operation, composition, args...) do { \ 177 struct mac_policy_conf *mpc; \ 178 int entrycount; \ 179 \ 180 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ 181 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 182 result = result composition \ 183 mpc->mpc_ops->mpo_ ## operation (args); \ 184 } \ 185 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ 186 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 187 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 188 result = result composition \ 189 mpc->mpc_ops->mpo_ ## operation \ 190 (args); \ 191 } \ 192 mac_policy_list_unbusy(); \ 193 } \ 194 } while (0) 195 196 #define MAC_EXTERNALIZE(type, label, elementlist, outbuf, \ 197 outbuflen) do { \ 198 int claimed, first, ignorenotfound, savedlen; \ 199 char *element_name, *element_temp; \ 200 struct sbuf sb; \ 201 \ 202 error = 0; \ 203 first = 1; \ 204 sbuf_new(&sb, outbuf, outbuflen, SBUF_FIXEDLEN); \ 205 element_temp = elementlist; \ 206 while ((element_name = strsep(&element_temp, ",")) != NULL) { \ 207 if (element_name[0] == '?') { \ 208 element_name++; \ 209 ignorenotfound = 1; \ 210 } else \ 211 ignorenotfound = 0; \ 212 savedlen = sbuf_len(&sb); \ 213 if (first) \ 214 error = sbuf_printf(&sb, "%s/", element_name); \ 215 else \ 216 error = sbuf_printf(&sb, ",%s/", element_name); \ 217 if (error == -1) { \ 218 error = EINVAL; /* XXX: E2BIG? */ \ 219 break; \ 220 } \ 221 claimed = 0; \ 222 MAC_CHECK(externalize_ ## type ## _label, label, \ 223 element_name, &sb, &claimed); \ 224 if (error) \ 225 break; \ 226 if (claimed == 0 && ignorenotfound) { \ 227 /* Revert last label name. */ \ 228 sbuf_setpos(&sb, savedlen); \ 229 } else if (claimed != 1) { \ 230 error = EINVAL; /* XXX: ENOLABEL? */ \ 231 break; \ 232 } else { \ 233 first = 0; \ 234 } \ 235 } \ 236 sbuf_finish(&sb); \ 237 } while (0) 238 239 #define MAC_INTERNALIZE(type, label, instring) do { \ 240 char *element, *element_name, *element_data; \ 241 int claimed; \ 242 \ 243 error = 0; \ 244 element = instring; \ 245 while ((element_name = strsep(&element, ",")) != NULL) { \ 246 element_data = element_name; \ 247 element_name = strsep(&element_data, "/"); \ 248 if (element_data == NULL) { \ 249 error = EINVAL; \ 250 break; \ 251 } \ 252 claimed = 0; \ 253 MAC_CHECK(internalize_ ## type ## _label, label, \ 254 element_name, element_data, &claimed); \ 255 if (error) \ 256 break; \ 257 if (claimed != 1) { \ 258 /* XXXMAC: Another error here? */ \ 259 error = EINVAL; \ 260 break; \ 261 } \ 262 } \ 263 } while (0) 264 265 /* 266 * MAC_PERFORM performs the designated operation by walking the policy 267 * module list and invoking that operation for each policy. 268 */ 269 #define MAC_PERFORM(operation, args...) do { \ 270 struct mac_policy_conf *mpc; \ 271 int entrycount; \ 272 \ 273 LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ 274 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 275 mpc->mpc_ops->mpo_ ## operation (args); \ 276 } \ 277 if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ 278 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ 279 if (mpc->mpc_ops->mpo_ ## operation != NULL) \ 280 mpc->mpc_ops->mpo_ ## operation (args); \ 281 } \ 282 mac_policy_list_unbusy(); \ 283 } \ 284 } while (0)
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