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 #include <string.h>
  71 #include <sys/param.h>
  72 #include <sys/queue.h>
  73 #include <security/mac.h>
  74 #include <security/mac_framework.h>
  75 #include <security/mac_policy.h>
  76 #include <security/mac_data.h>
  77 #include <sys/sysctl.h>
  78 #include <kern/wait_queue.h>
  79 #include <kern/locks.h>
  80 #include <sys/kernel.h>
  81 #include <sys/lock.h>
  82 #include <sys/malloc.h>
  83 #include <sys/sbuf.h>
  84 #include <sys/proc.h>
  85 #include <sys/systm.h>
  86 #include <sys/socket.h>
  87 #include <sys/socketvar.h>
  88 #include <sys/vnode.h>
  89
  90 /*
  91  * MAC Framework sysctl namespace.
  92  */
  93
  94 SYSCTL_DECL(_security);
  95 SYSCTL_DECL(_security_mac);
  96
  97 extern int mac_late;
  98
  99 struct mac_policy_list_element {
 100         struct mac_policy_conf *mpc;
 101 };
 102
 103 struct mac_policy_list {
 104         u_int                           numloaded;
 105         u_int                           max;
 106         u_int                           maxindex;
 107         u_int                           staticmax;
 108         u_int                           chunks;
 109         u_int                           freehint;
 110         struct mac_policy_list_element  *entries;
 111 };
 112
 113 typedef struct mac_policy_list mac_policy_list_t;
 114
 115
 116 /*
 117  * Policy that has registered with the framework for a specific
 118  * label namespace name.
 119  */
 120 struct mac_label_listener {
 121         mac_policy_handle_t             mll_handle;
 122         LIST_ENTRY(mac_label_listener)  mll_list;
 123 };
 124
 125 LIST_HEAD(mac_label_listeners_t, mac_label_listener);
 126
 127 /*
 128  * Type of list used to manage label namespace names.
 129  */
 130 struct mac_label_element {
 131         char                            mle_name[MAC_MAX_LABEL_ELEMENT_NAME];
 132         struct mac_label_listeners_t    mle_listeners;
 133         LIST_ENTRY(mac_label_element)   mle_list;
 134 };
 135
 136 LIST_HEAD(mac_label_element_list_t, mac_label_element);
 137
 138 /*
 139  * Journal operations
 140  */
 141
 142 #define MLJ_TYPE_PORT           1
 143 #define MLJ_TYPE_TASK           2
 144
 145 #define MLJ_PORT_OP_INIT        0x0001
 146 #define MLJ_PORT_OP_CREATE_K    0x0002
 147 #define MLJ_PORT_OP_CREATE      0x0004
 148 #define MLJ_PORT_OP_UPDATE      0x0008
 149
 150 #define MLJ_TASK_OP_INIT        0x0001
 151 #define MLJ_TASK_OP_CREATE_K    0x0002
 152
 153 struct mac_label_journal {
 154         struct label *l;
 155         int type;
 156         int ops;
 157
 158         int kotype;     /* Kernel Port */
 159
 160         TAILQ_ENTRY(mac_label_journal) link;
 161 };
 162 TAILQ_HEAD(mac_label_journal_list_t, mac_label_journal);
 163
 164 int     mac_label_journal_add   (struct label *, int);
 165 int     mac_label_journal_remove(struct label *);
 166 struct mac_label_journal *
 167         mac_label_journal_find  (struct label *);
 168 int     mac_label_journal       (struct label *, int, ...);
 169 void    mac_label_journal_replay(void);
 170
 171
 172 /*
 173  * MAC Framework global variables.
 174  */
 175
 176 extern struct mac_label_element_list_t mac_label_element_list;
 177 extern struct mac_label_element_list_t mac_static_label_element_list;
 178 extern struct mac_label_journal_list_t mac_label_journal_list;
 179
 180 extern struct mac_policy_list mac_policy_list;
 181
 182 /*
 183  * global flags to control whether a MACF subsystem is configured
 184  * at all in the system.
 185  */
 186 extern unsigned int mac_device_enforce;
 187 extern unsigned int mac_file_enforce;
 188 extern unsigned int mac_iokit_enforce;
 189 extern unsigned int mac_pipe_enforce;
 190 extern unsigned int mac_posixsem_enforce;
 191 extern unsigned int mac_posixshm_enforce;
 192 extern unsigned int mac_proc_enforce;
 193 extern unsigned int mac_socket_enforce;
 194 extern unsigned int mac_system_enforce;
 195 extern unsigned int mac_sysvmsg_enforce;
 196 extern unsigned int mac_sysvsem_enforce;
 197 extern unsigned int mac_sysvshm_enforce;
 198 extern unsigned int mac_vm_enforce;
 199 extern unsigned int mac_vnode_enforce;
 200
 201 #if CONFIG_MACF_MACH
 202 extern unsigned int mac_port_enforce;
 203 extern unsigned int mac_task_enforce;
 204 #endif
 205
 206 #if CONFIG_MACF_NET
 207 extern unsigned int mac_label_mbufs;
 208 #endif
 209
 210 extern unsigned int mac_label_vnodes;
 211
 212 static int mac_proc_check_enforce(proc_t p, int enforce_flag);
 213
 214 static __inline__ int mac_proc_check_enforce(proc_t p, int enforce_flags)
 215 {
 216 #if CONFIG_MACF
 217         return ((p->p_mac_enforce & enforce_flags) != 0);
 218 #else
 219         return 0;
 220 #endif
 221 }
 222
 223 static int mac_context_check_enforce(vfs_context_t ctx, int enforce_flags);
 224 static void mac_context_set_enforce(vfs_context_t ctx, int enforce_flags);
 225
 226 static __inline__ int mac_context_check_enforce(vfs_context_t ctx, int enforce_flags)
 227 {
 228         proc_t proc = vfs_context_proc(ctx);
 229
 230         if (proc == NULL)
 231                 return 0;
 232
 233         return (mac_proc_check_enforce(proc, enforce_flags));
 234 }
 235
 236 static __inline__ void mac_context_set_enforce(vfs_context_t ctx, int enforce_flags)
 237 {
 238         proc_t proc = vfs_context_proc(ctx);
 239
 240         if (proc == NULL)
 241                 return;
 242
 243         mac_proc_set_enforce(proc, enforce_flags);
 244 }
 245
 246
 247 /*
 248  * MAC Framework infrastructure functions.
 249  */
 250
 251 int mac_error_select(int error1, int error2);
 252
 253 void  mac_policy_list_busy(void);
 254 int   mac_policy_list_conditional_busy(void);
 255 void  mac_policy_list_unbusy(void);
 256
 257 void           mac_labelzone_init(void);
 258 struct label  *mac_labelzone_alloc(int flags);
 259 void           mac_labelzone_free(struct label *label);
 260
 261 void  mac_label_init(struct label *label);
 262 void  mac_label_destroy(struct label *label);
 263 #if KERNEL
 264 int   mac_check_structmac_consistent(struct user_mac *mac);
 265 #else
 266 int   mac_check_structmac_consistent(struct mac *mac);
 267 #endif
 268
 269 int mac_cred_label_externalize(struct label *, char *e, char *out, size_t olen, int flags);
 270 int mac_lctx_label_externalize(struct label *, char *e, char *out, size_t olen);
 271 #if CONFIG_MACF_SOCKET
 272 int mac_socket_label_externalize(struct label *, char *e, char *out, size_t olen);
 273 #endif /* CONFIG_MACF_SOCKET */
 274 int mac_vnode_label_externalize(struct label *, char *e, char *out, size_t olen, int flags);
 275 int mac_pipe_label_externalize(struct label *label, char *elements,
 276  char *outbuf, size_t outbuflen);
 277
 278 int mac_cred_label_internalize(struct label *label, char *string);
 279 int mac_lctx_label_internalize(struct label *label, char *string);
 280 #if CONFIG_MACF_SOCKET
 281 int mac_socket_label_internalize(struct label *label, char *string);
 282 #endif /* CONFIG_MACF_SOCKET */
 283 int mac_vnode_label_internalize(struct label *label, char *string);
 284 int mac_pipe_label_internalize(struct label *label, char *string);
 285
 286 #if CONFIG_MACF_SOCKET
 287 /* internal socket label manipulation functions */
 288 struct  label *mac_socket_label_alloc(int flags);
 289 void    mac_socket_label_free(struct label *l);
 290 int     mac_socket_label_update(struct ucred *cred, struct socket *so, struct label *l);
 291 #endif /* MAC_SOCKET */
 292
 293 #if CONFIG_MACF_NET
 294 struct label *mac_mbuf_to_label(struct mbuf *m);
 295 #else
 296 #define mac_mbuf_to_label(m) (NULL)
 297 #endif
 298
 299 /*
 300  * MAC_CHECK performs the designated check by walking the policy
 301  * module list and checking with each as to how it feels about the
 302  * request.  Note that it returns its value via 'error' in the scope
 303  * of the caller.
 304  */
 305 #define MAC_CHECK(check, args...) do {                                  \
 306         struct mac_policy_conf *mpc;                                    \
 307         u_int i;                                                        \
 308                                                                         \
 309         error = 0;                                                      \
 310         for (i = 0; i < mac_policy_list.staticmax; i++) {               \
 311                 mpc = mac_policy_list.entries[i].mpc;                   \
 312                 if (mpc == NULL)                                        \
 313                         continue;                                       \
 314                                                                         \
 315                 if (mpc->mpc_ops->mpo_ ## check != NULL)                \
 316                         error = mac_error_select(                       \
 317                             mpc->mpc_ops->mpo_ ## check (args),         \
 318                             error);                                     \
 319         }                                                               \
 320         if (mac_policy_list_conditional_busy() != 0) {                  \
 321                 for (; i <= mac_policy_list.maxindex; i++) {            \
 322                         mpc = mac_policy_list.entries[i].mpc;           \
 323                         if (mpc == NULL)                                \
 324                                 continue;                               \
 325                                                                         \
 326                         if (mpc->mpc_ops->mpo_ ## check != NULL)        \
 327                                 error = mac_error_select(               \
 328                                     mpc->mpc_ops->mpo_ ## check (args), \
 329                                     error);                             \
 330                 }                                                       \
 331                 mac_policy_list_unbusy();                               \
 332         }                                                               \
 333 } while (0)
 334
 335 /*
 336  * MAC_GRANT performs the designated check by walking the policy
 337  * module list and checking with each as to how it feels about the
 338  * request.  Unlike MAC_CHECK, it grants if any policies return '0',
 339  * and otherwise returns EPERM.  Note that it returns its value via
 340  * 'error' in the scope of the caller.
 341  */
 342 #define MAC_GRANT(check, args...) do {                                  \
 343         struct mac_policy_conf *mpc;                                    \
 344         u_int i;                                                        \
 345                                                                         \
 346         error = EPERM;                                                  \
 347         for (i = 0; i < mac_policy_list.staticmax; i++) {               \
 348                 mpc = mac_policy_list.entries[i].mpc;                   \
 349                 if (mpc == NULL)                                        \
 350                         continue;                                       \
 351                                                                         \
 352                 if (mpc->mpc_ops->mpo_ ## check != NULL) {              \
 353                         if (mpc->mpc_ops->mpo_ ## check (args) == 0)    \
 354                                 error = 0;                              \
 355                 }                                                       \
 356         }                                                               \
 357         if (mac_policy_list_conditional_busy() != 0) {                  \
 358                 for (; i <= mac_policy_list.maxindex; i++) {            \
 359                         mpc = mac_policy_list.entries[i].mpc;           \
 360                         if (mpc == NULL)                                \
 361                                 continue;                               \
 362                                                                         \
 363                         if (mpc->mpc_ops->mpo_ ## check != NULL) {      \
 364                                 if (mpc->mpc_ops->mpo_ ## check (args)  \
 365                                     == 0)                               \
 366                                         error = 0;                      \
 367                         }                                               \
 368                 }                                                       \
 369                 mac_policy_list_unbusy();                               \
 370         }                                                               \
 371 } while (0)
 372
 373 /*
 374  * MAC_BOOLEAN performs the designated boolean composition by walking
 375  * the module list, invoking each instance of the operation, and
 376  * combining the results using the passed C operator.  Note that it
 377  * returns its value via 'result' in the scope of the caller, which
 378  * should be initialized by the caller in a meaningful way to get
 379  * a meaningful result.
 380  */
 381 #define MAC_BOOLEAN(operation, composition, args...) do {               \
 382         struct mac_policy_conf *mpc;                                    \
 383         u_int i;                                                        \
 384                                                                         \
 385         for (i = 0; i < mac_policy_list.staticmax; i++) {               \
 386                 mpc = mac_policy_list.entries[i].mpc;                   \
 387                 if (mpc == NULL)                                        \
 388                         continue;                                       \
 389                                                                         \
 390                 if (mpc->mpc_ops->mpo_ ## operation != NULL)            \
 391                         result = result composition                     \
 392                             mpc->mpc_ops->mpo_ ## operation             \
 393                             (args);                                     \
 394         }                                                               \
 395         if (mac_policy_list_conditional_busy() != 0) {                  \
 396                 for (; i <= mac_policy_list.maxindex; 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                                 result = result composition             \
 403                                     mpc->mpc_ops->mpo_ ## operation     \
 404                                     (args);                             \
 405                 }                                                       \
 406                 mac_policy_list_unbusy();                               \
 407         }                                                               \
 408 } while (0)
 409
 410 #define MAC_INTERNALIZE(obj, label, instring)                           \
 411         mac_internalize(offsetof(struct mac_policy_ops, mpo_ ## obj ## _label_internalize), label, instring)
 412
 413 #define MAC_EXTERNALIZE(obj, label, elementlist, outbuf, outbuflen)     \
 414         mac_externalize(offsetof(struct mac_policy_ops, mpo_ ## obj ## _label_externalize), label, elementlist, outbuf, outbuflen)
 415
 416 #define MAC_EXTERNALIZE_AUDIT(obj, label, outbuf, outbuflen)    \
 417         mac_externalize(offsetof(struct mac_policy_ops, mpo_ ## obj ## _label_externalize_audit), label, "*", outbuf, outbuflen)
 418
 419 /*
 420  * MAC_PERFORM performs the designated operation by walking the policy
 421  * module list and invoking that operation for each policy.
 422  */
 423 #define MAC_PERFORM(operation, args...) do {                            \
 424         struct mac_policy_conf *mpc;                                    \
 425         u_int i;                                                        \
 426                                                                         \
 427         for (i = 0; i < mac_policy_list.staticmax; i++) {               \
 428                 mpc = mac_policy_list.entries[i].mpc;                   \
 429                 if (mpc == NULL)                                        \
 430                         continue;                                       \
 431                                                                         \
 432                 if (mpc->mpc_ops->mpo_ ## operation != NULL)            \
 433                         mpc->mpc_ops->mpo_ ## operation (args);         \
 434         }                                                               \
 435         if (mac_policy_list_conditional_busy() != 0) {                  \
 436                 for (; i <= mac_policy_list.maxindex; i++) {            \
 437                         mpc = mac_policy_list.entries[i].mpc;           \
 438                         if (mpc == NULL)                                \
 439                                 continue;                               \
 440                                                                         \
 441                         if (mpc->mpc_ops->mpo_ ## operation != NULL)    \
 442                                 mpc->mpc_ops->mpo_ ## operation (args); \
 443                 }                                                       \
 444                 mac_policy_list_unbusy();                               \
 445         }                                                               \
 446 } while (0)
 447
 448 struct __mac_get_pid_args;
 449 struct __mac_get_proc_args;
 450 struct __mac_set_proc_args;
 451 struct __mac_get_lcid_args;
 452 struct __mac_get_lctx_args;
 453 struct __mac_set_lctx_args;
 454 struct __mac_get_fd_args;
 455 struct __mac_get_file_args;
 456 struct __mac_get_link_args;
 457 struct __mac_set_fd_args;
 458 struct __mac_set_file_args;
 459 struct __mac_syscall_args;
 460
 461 void mac_policy_addto_labellist(const mac_policy_handle_t, int);
 462 void mac_policy_removefrom_labellist(const mac_policy_handle_t);
 463
 464 int mac_externalize(size_t mpo_externalize_off, struct label *label,
 465     const char *elementlist, char *outbuf, size_t outbuflen);
 466 int mac_internalize(size_t mpo_internalize_off, struct label *label,
 467     char *elementlist);
 468 #endif  /* !_SECURITY_MAC_INTERNAL_H_ */