security/mac_internal.h

   1 /*
   2  * Copyright (c) 2007 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 /*-
  30  * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
  31  * Copyright (c) 2001 Ilmar S. Habibulin
  32  * Copyright (c) 2001, 2002, 2003, 2004 Networks Associates Technology, Inc.
  33  * Copyright (c) 2005 SPARTA, Inc.
  34  * All rights reserved.
  35  *
  36  * This software was developed by Robert Watson and Ilmar Habibulin for the
  37  * TrustedBSD Project.
  38  *
  39  * This software was developed for the FreeBSD Project in part by Network
  40  * Associates Laboratories, the Security Research Division of Network
  41  * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
  42  * as part of the DARPA CHATS research program.
  43  *
  44  * Redistribution and use in source and binary forms, with or without
  45  * modification, are permitted provided that the following conditions
  46  * are met:
  47  * 1. Redistributions of source code must retain the above copyright
  48  *    notice, this list of conditions and the following disclaimer.
  49  * 2. Redistributions in binary form must reproduce the above copyright
  50  *    notice, this list of conditions and the following disclaimer in the
  51  *    documentation and/or other materials provided with the distribution.
  52  *
  53  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  54  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  55  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  56  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  57  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  58  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  59  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  61  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  62  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  63  * SUCH DAMAGE.
  64  *
  65  */
  66
  67 #ifndef _SECURITY_MAC_INTERNAL_H_
  68 #define _SECURITY_MAC_INTERNAL_H_
  69
  70 #ifndef PRIVATE
  71 #warning "MAC policy is not KPI, see Technical Q&A QA1574, this header will be removed in next version"
  72 #endif
  73
  74 #include <string.h>
  75 #include <sys/param.h>
  76 #include <sys/queue.h>
  77 #include <security/mac.h>
  78 #include <security/mac_framework.h>
  79 #include <security/mac_policy.h>
  80 #include <security/mac_data.h>
  81 #include <sys/sysctl.h>
  82 #include <kern/locks.h>
  83 #include <sys/kernel.h>
  84 #include <sys/lock.h>
  85 #include <sys/malloc.h>
  86 #include <sys/sbuf.h>
  87 #include <sys/proc.h>
  88 #include <sys/systm.h>
  89 #include <sys/socket.h>
  90 #include <sys/socketvar.h>
  91 #include <sys/vnode.h>
  92
  93 /*
  94  * MAC Framework sysctl namespace.
  95  */
  96
  97 SYSCTL_DECL(_security);
  98 SYSCTL_DECL(_security_mac);
  99
 100 extern int mac_late;
 101
 102 struct mac_policy_list_element {
 103         struct mac_policy_conf *mpc;
 104 };
 105
 106 struct mac_policy_list {
 107         u_int                           numloaded;
 108         u_int                           max;
 109         u_int                           maxindex;
 110         u_int                           staticmax;
 111         u_int                           chunks;
 112         u_int                           freehint;
 113         struct mac_policy_list_element  *entries;
 114 };
 115
 116 typedef struct mac_policy_list mac_policy_list_t;
 117
 118
 119 /*
 120  * Policy that has registered with the framework for a specific
 121  * label namespace name.
 122  */
 123 struct mac_label_listener {
 124         mac_policy_handle_t             mll_handle;
 125         LIST_ENTRY(mac_label_listener)  mll_list;
 126 };
 127
 128 LIST_HEAD(mac_label_listeners_t, mac_label_listener);
 129
 130 /*
 131  * Type of list used to manage label namespace names.
 132  */
 133 struct mac_label_element {
 134         char                            mle_name[MAC_MAX_LABEL_ELEMENT_NAME];
 135         struct mac_label_listeners_t    mle_listeners;
 136         LIST_ENTRY(mac_label_element)   mle_list;
 137 };
 138
 139 LIST_HEAD(mac_label_element_list_t, mac_label_element);
 140
 141 /*
 142  * MAC Framework global variables.
 143  */
 144
 145 extern struct mac_label_element_list_t mac_label_element_list;
 146 extern struct mac_label_element_list_t mac_static_label_element_list;
 147
 148 extern struct mac_policy_list mac_policy_list;
 149
 150 /*
 151  * global flags to control whether a MACF subsystem is configured
 152  * at all in the system.
 153  */
 154 extern unsigned int mac_device_enforce;
 155 extern unsigned int mac_pipe_enforce;
 156 extern unsigned int mac_posixsem_enforce;
 157 extern unsigned int mac_posixshm_enforce;
 158 extern unsigned int mac_proc_enforce;
 159 extern unsigned int mac_socket_enforce;
 160 extern unsigned int mac_system_enforce;
 161 extern unsigned int mac_sysvmsg_enforce;
 162 extern unsigned int mac_sysvsem_enforce;
 163 extern unsigned int mac_sysvshm_enforce;
 164 extern unsigned int mac_vm_enforce;
 165 extern unsigned int mac_vnode_enforce;
 166
 167 #if CONFIG_MACF_NET
 168 extern unsigned int mac_label_mbufs;
 169 #endif
 170
 171 extern unsigned int mac_label_vnodes;
 172
 173 static int mac_proc_check_enforce(proc_t p, int enforce_flags);
 174
 175 static __inline__ int mac_proc_check_enforce(proc_t p, int enforce_flags)
 176 {
 177 #if CONFIG_MACF
 178 #if SECURITY_MAC_CHECK_ENFORCE // 21167099 - only check if we allow write
 179     return ((p->p_mac_enforce & enforce_flags) != 0);
 180 #else
 181 #pragma unused(p,enforce_flags)
 182     return 1;
 183 #endif // SECURITY_MAC_CHECK_ENFORCE
 184 #else
 185 #pragma unused(p,enforce_flags)
 186         return 0;
 187 #endif // CONFIG_MACF
 188 }
 189
 190 static int mac_context_check_enforce(vfs_context_t ctx, int enforce_flags);
 191 static void mac_context_set_enforce(vfs_context_t ctx, int enforce_flags);
 192
 193 static __inline__ int mac_context_check_enforce(vfs_context_t ctx, int enforce_flags)
 194 {
 195         proc_t proc = vfs_context_proc(ctx);
 196
 197         if (proc == NULL)
 198                 return 0;
 199
 200         return (mac_proc_check_enforce(proc, enforce_flags));
 201 }
 202
 203 static __inline__ void mac_context_set_enforce(vfs_context_t ctx, int enforce_flags)
 204 {
 205 #if CONFIG_MACF
 206         proc_t proc = vfs_context_proc(ctx);
 207
 208         if (proc == NULL)
 209                 return;
 210
 211         mac_proc_set_enforce(proc, enforce_flags);
 212 #else
 213 #pragma unused(ctx,enforce_flags)
 214 #endif
 215 }
 216
 217
 218 /*
 219  * MAC Framework infrastructure functions.
 220  */
 221
 222 int mac_error_select(int error1, int error2);
 223
 224 void  mac_policy_list_busy(void);
 225 int   mac_policy_list_conditional_busy(void);
 226 void  mac_policy_list_unbusy(void);
 227
 228 void           mac_labelzone_init(void);
 229 struct label  *mac_labelzone_alloc(int flags);
 230 void           mac_labelzone_free(struct label *label);
 231
 232 void  mac_label_init(struct label *label);
 233 void  mac_label_destroy(struct label *label);
 234 #if KERNEL
 235 int   mac_check_structmac_consistent(struct user_mac *mac);
 236 #else
 237 int   mac_check_structmac_consistent(struct mac *mac);
 238 #endif
 239
 240 int mac_cred_label_externalize(struct label *, char *e, char *out, size_t olen, int flags);
 241 #if CONFIG_MACF_SOCKET
 242 int mac_socket_label_externalize(struct label *, char *e, char *out, size_t olen);
 243 #endif /* CONFIG_MACF_SOCKET */
 244 int mac_vnode_label_externalize(struct label *, char *e, char *out, size_t olen, int flags);
 245 int mac_pipe_label_externalize(struct label *label, char *elements,
 246  char *outbuf, size_t outbuflen);
 247
 248 int mac_cred_label_internalize(struct label *label, char *string);
 249 #if CONFIG_MACF_SOCKET
 250 int mac_socket_label_internalize(struct label *label, char *string);
 251 #endif /* CONFIG_MACF_SOCKET */
 252 int mac_vnode_label_internalize(struct label *label, char *string);
 253 int mac_pipe_label_internalize(struct label *label, char *string);
 254
 255 #if CONFIG_MACF_SOCKET
 256 /* internal socket label manipulation functions */
 257 struct  label *mac_socket_label_alloc(int flags);
 258 void    mac_socket_label_free(struct label *l);
 259 int     mac_socket_label_update(struct ucred *cred, struct socket *so, struct label *l);
 260 #endif /* MAC_SOCKET */
 261
 262 #if CONFIG_MACF_NET
 263 struct label *mac_mbuf_to_label(struct mbuf *m);
 264 #else
 265 #define mac_mbuf_to_label(m) (NULL)
 266 #endif
 267
 268 /*
 269  * MAC_CHECK performs the designated check by walking the policy
 270  * module list and checking with each as to how it feels about the
 271  * request.  Note that it returns its value via 'error' in the scope
 272  * of the caller.
 273  */
 274 #define MAC_CHECK(check, args...) do {                                  \
 275         struct mac_policy_conf *mpc;                                    \
 276         u_int i;                                                        \
 277                                                                         \
 278         error = 0;                                                      \
 279         for (i = 0; i < mac_policy_list.staticmax; i++) {               \
 280                 mpc = mac_policy_list.entries[i].mpc;                   \
 281                 if (mpc == NULL)                                        \
 282                         continue;                                       \
 283                                                                         \
 284                 if (mpc->mpc_ops->mpo_ ## check != NULL)                \
 285                         error = mac_error_select(                       \
 286                             mpc->mpc_ops->mpo_ ## check (args),         \
 287                             error);                                     \
 288         }                                                               \
 289         if (mac_policy_list_conditional_busy() != 0) {                  \
 290                 for (; i <= mac_policy_list.maxindex; i++) {            \
 291                         mpc = mac_policy_list.entries[i].mpc;           \
 292                         if (mpc == NULL)                                \
 293                                 continue;                               \
 294                                                                         \
 295                         if (mpc->mpc_ops->mpo_ ## check != NULL)        \
 296                                 error = mac_error_select(               \
 297                                     mpc->mpc_ops->mpo_ ## check (args), \
 298                                     error);                             \
 299                 }                                                       \
 300                 mac_policy_list_unbusy();                               \
 301         }                                                               \
 302 } while (0)
 303
 304 /*
 305  * MAC_GRANT performs the designated check by walking the policy
 306  * module list and checking with each as to how it feels about the
 307  * request.  Unlike MAC_CHECK, it grants if any policies return '0',
 308  * and otherwise returns EPERM.  Note that it returns its value via
 309  * 'error' in the scope of the caller.
 310  */
 311 #define MAC_GRANT(check, args...) do {                                  \
 312         struct mac_policy_conf *mpc;                                    \
 313         u_int i;                                                        \
 314                                                                         \
 315         error = EPERM;                                                  \
 316         for (i = 0; i < mac_policy_list.staticmax; i++) {               \
 317                 mpc = mac_policy_list.entries[i].mpc;                   \
 318                 if (mpc == NULL)                                        \
 319                         continue;                                       \
 320                                                                         \
 321                 if (mpc->mpc_ops->mpo_ ## check != NULL) {              \
 322                         if (mpc->mpc_ops->mpo_ ## check (args) == 0)    \
 323                                 error = 0;                              \
 324                 }                                                       \
 325         }                                                               \
 326         if (mac_policy_list_conditional_busy() != 0) {                  \
 327                 for (; i <= mac_policy_list.maxindex; i++) {            \
 328                         mpc = mac_policy_list.entries[i].mpc;           \
 329                         if (mpc == NULL)                                \
 330                                 continue;                               \
 331                                                                         \
 332                         if (mpc->mpc_ops->mpo_ ## check != NULL) {      \
 333                                 if (mpc->mpc_ops->mpo_ ## check (args)  \
 334                                     == 0)                               \
 335                                         error = 0;                      \
 336                         }                                               \
 337                 }                                                       \
 338                 mac_policy_list_unbusy();                               \
 339         }                                                               \
 340 } while (0)
 341
 342 /*
 343  * MAC_BOOLEAN performs the designated boolean composition by walking
 344  * the module list, invoking each instance of the operation, and
 345  * combining the results using the passed C operator.  Note that it
 346  * returns its value via 'result' in the scope of the caller, which
 347  * should be initialized by the caller in a meaningful way to get
 348  * a meaningful result.
 349  */
 350 #define MAC_BOOLEAN(operation, composition, args...) do {               \
 351         struct mac_policy_conf *mpc;                                    \
 352         u_int i;                                                        \
 353                                                                         \
 354         for (i = 0; i < mac_policy_list.staticmax; i++) {               \
 355                 mpc = mac_policy_list.entries[i].mpc;                   \
 356                 if (mpc == NULL)                                        \
 357                         continue;                                       \
 358                                                                         \
 359                 if (mpc->mpc_ops->mpo_ ## operation != NULL)            \
 360                         result = result composition                     \
 361                             mpc->mpc_ops->mpo_ ## operation             \
 362                             (args);                                     \
 363         }                                                               \
 364         if (mac_policy_list_conditional_busy() != 0) {                  \
 365                 for (; i <= mac_policy_list.maxindex; i++) {            \
 366                         mpc = mac_policy_list.entries[i].mpc;           \
 367                         if (mpc == NULL)                                \
 368                                 continue;                               \
 369                                                                         \
 370                         if (mpc->mpc_ops->mpo_ ## operation != NULL)    \
 371                                 result = result composition             \
 372                                     mpc->mpc_ops->mpo_ ## operation     \
 373                                     (args);                             \
 374                 }                                                       \
 375                 mac_policy_list_unbusy();                               \
 376         }                                                               \
 377 } while (0)
 378
 379 #define MAC_INTERNALIZE(obj, label, instring)                           \
 380         mac_internalize(offsetof(struct mac_policy_ops, mpo_ ## obj ## _label_internalize), label, instring)
 381
 382 #define MAC_EXTERNALIZE(obj, label, elementlist, outbuf, outbuflen)     \
 383         mac_externalize(offsetof(struct mac_policy_ops, mpo_ ## obj ## _label_externalize), label, elementlist, outbuf, outbuflen)
 384
 385 #define MAC_EXTERNALIZE_AUDIT(obj, label, outbuf, outbuflen)    \
 386         mac_externalize(offsetof(struct mac_policy_ops, mpo_ ## obj ## _label_externalize_audit), label, "*", outbuf, outbuflen)
 387
 388 /*
 389  * MAC_PERFORM performs the designated operation by walking the policy
 390  * module list and invoking that operation for each policy.
 391  */
 392 #define MAC_PERFORM(operation, args...) do {                            \
 393         struct mac_policy_conf *mpc;                                    \
 394         u_int i;                                                        \
 395                                                                         \
 396         for (i = 0; i < mac_policy_list.staticmax; i++) {               \
 397                 mpc = mac_policy_list.entries[i].mpc;                   \
 398                 if (mpc == NULL)                                        \
 399                         continue;                                       \
 400                                                                         \
 401                 if (mpc->mpc_ops->mpo_ ## operation != NULL)            \
 402                         mpc->mpc_ops->mpo_ ## operation (args);         \
 403         }                                                               \
 404         if (mac_policy_list_conditional_busy() != 0) {                  \
 405                 for (; i <= mac_policy_list.maxindex; i++) {            \
 406                         mpc = mac_policy_list.entries[i].mpc;           \
 407                         if (mpc == NULL)                                \
 408                                 continue;                               \
 409                                                                         \
 410                         if (mpc->mpc_ops->mpo_ ## operation != NULL)    \
 411                                 mpc->mpc_ops->mpo_ ## operation (args); \
 412                 }                                                       \
 413                 mac_policy_list_unbusy();                               \
 414         }                                                               \
 415 } while (0)
 416
 417 struct __mac_get_pid_args;
 418 struct __mac_get_proc_args;
 419 struct __mac_set_proc_args;
 420 struct __mac_get_lcid_args;
 421 struct __mac_get_fd_args;
 422 struct __mac_get_file_args;
 423 struct __mac_get_link_args;
 424 struct __mac_set_fd_args;
 425 struct __mac_set_file_args;
 426 struct __mac_syscall_args;
 427
 428 void mac_policy_addto_labellist(const mac_policy_handle_t, int);
 429 void mac_policy_removefrom_labellist(const mac_policy_handle_t);
 430
 431 int mac_externalize(size_t mpo_externalize_off, struct label *label,
 432     const char *elementlist, char *outbuf, size_t outbuflen);
 433 int mac_internalize(size_t mpo_internalize_off, struct label *label,
 434     char *elementlist);
 435 #endif  /* !_SECURITY_MAC_INTERNAL_H_ */