1 /* 2 * security/tomoyo/domain.c 3 * 4 * Copyright (C) 2005-2011 NTT DATA CORPORATION 5 */ 6 7 #include "common.h" 8 #include <linux/binfmts.h> 9 #include <linux/slab.h> 10 11 /* Variables definitions.*/ 12 13 /* The initial domain. */ 14 struct tomoyo_domain_info tomoyo_kernel_domain; 15 16 /** 17 * tomoyo_update_policy - Update an entry for exception policy. 18 * 19 * @new_entry: Pointer to "struct tomoyo_acl_info". 20 * @size: Size of @new_entry in bytes. 21 * @param: Pointer to "struct tomoyo_acl_param". 22 * @check_duplicate: Callback function to find duplicated entry. 23 * 24 * Returns 0 on success, negative value otherwise. 25 * 26 * Caller holds tomoyo_read_lock(). 27 */ 28 int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size, 29 struct tomoyo_acl_param *param, 30 bool (*check_duplicate) (const struct tomoyo_acl_head 31 *, 32 const struct tomoyo_acl_head 33 *)) 34 { 35 int error = param->is_delete ? -ENOENT : -ENOMEM; 36 struct tomoyo_acl_head *entry; 37 struct list_head *list = param->list; 38 39 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 40 return -ENOMEM; 41 list_for_each_entry_rcu(entry, list, list) { 42 if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS) 43 continue; 44 if (!check_duplicate(entry, new_entry)) 45 continue; 46 entry->is_deleted = param->is_delete; 47 error = 0; 48 break; 49 } 50 if (error && !param->is_delete) { 51 entry = tomoyo_commit_ok(new_entry, size); 52 if (entry) { 53 list_add_tail_rcu(&entry->list, list); 54 error = 0; 55 } 56 } 57 mutex_unlock(&tomoyo_policy_lock); 58 return error; 59 } 60 61 /** 62 * tomoyo_same_acl_head - Check for duplicated "struct tomoyo_acl_info" entry. 63 * 64 * @a: Pointer to "struct tomoyo_acl_info". 65 * @b: Pointer to "struct tomoyo_acl_info". 66 * 67 * Returns true if @a == @b, false otherwise. 68 */ 69 static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *a, 70 const struct tomoyo_acl_info *b) 71 { 72 return a->type == b->type && a->cond == b->cond; 73 } 74 75 /** 76 * tomoyo_update_domain - Update an entry for domain policy. 77 * 78 * @new_entry: Pointer to "struct tomoyo_acl_info". 79 * @size: Size of @new_entry in bytes. 80 * @param: Pointer to "struct tomoyo_acl_param". 81 * @check_duplicate: Callback function to find duplicated entry. 82 * @merge_duplicate: Callback function to merge duplicated entry. 83 * 84 * Returns 0 on success, negative value otherwise. 85 * 86 * Caller holds tomoyo_read_lock(). 87 */ 88 int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size, 89 struct tomoyo_acl_param *param, 90 bool (*check_duplicate) (const struct tomoyo_acl_info 91 *, 92 const struct tomoyo_acl_info 93 *), 94 bool (*merge_duplicate) (struct tomoyo_acl_info *, 95 struct tomoyo_acl_info *, 96 const bool)) 97 { 98 const bool is_delete = param->is_delete; 99 int error = is_delete ? -ENOENT : -ENOMEM; 100 struct tomoyo_acl_info *entry; 101 struct list_head * const list = param->list; 102 103 if (param->data[0]) { 104 new_entry->cond = tomoyo_get_condition(param); 105 if (!new_entry->cond) 106 return -EINVAL; 107 /* 108 * Domain transition preference is allowed for only 109 * "file execute" entries. 110 */ 111 if (new_entry->cond->transit && 112 !(new_entry->type == TOMOYO_TYPE_PATH_ACL && 113 container_of(new_entry, struct tomoyo_path_acl, head) 114 ->perm == 1 << TOMOYO_TYPE_EXECUTE)) 115 goto out; 116 } 117 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 118 goto out; 119 list_for_each_entry_rcu(entry, list, list) { 120 if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS) 121 continue; 122 if (!tomoyo_same_acl_head(entry, new_entry) || 123 !check_duplicate(entry, new_entry)) 124 continue; 125 if (merge_duplicate) 126 entry->is_deleted = merge_duplicate(entry, new_entry, 127 is_delete); 128 else 129 entry->is_deleted = is_delete; 130 error = 0; 131 break; 132 } 133 if (error && !is_delete) { 134 entry = tomoyo_commit_ok(new_entry, size); 135 if (entry) { 136 list_add_tail_rcu(&entry->list, list); 137 error = 0; 138 } 139 } 140 mutex_unlock(&tomoyo_policy_lock); 141 out: 142 tomoyo_put_condition(new_entry->cond); 143 return error; 144 } 145 146 /** 147 * tomoyo_check_acl - Do permission check. 148 * 149 * @r: Pointer to "struct tomoyo_request_info". 150 * @check_entry: Callback function to check type specific parameters. 151 * 152 * Returns 0 on success, negative value otherwise. 153 * 154 * Caller holds tomoyo_read_lock(). 155 */ 156 void tomoyo_check_acl(struct tomoyo_request_info *r, 157 bool (*check_entry) (struct tomoyo_request_info *, 158 const struct tomoyo_acl_info *)) 159 { 160 const struct tomoyo_domain_info *domain = r->domain; 161 struct tomoyo_acl_info *ptr; 162 bool retried = false; 163 const struct list_head *list = &domain->acl_info_list; 164 165 retry: 166 list_for_each_entry_rcu(ptr, list, list) { 167 if (ptr->is_deleted || ptr->type != r->param_type) 168 continue; 169 if (!check_entry(r, ptr)) 170 continue; 171 if (!tomoyo_condition(r, ptr->cond)) 172 continue; 173 r->matched_acl = ptr; 174 r->granted = true; 175 return; 176 } 177 if (!retried) { 178 retried = true; 179 list = &domain->ns->acl_group[domain->group]; 180 goto retry; 181 } 182 r->granted = false; 183 } 184 185 /* The list for "struct tomoyo_domain_info". */ 186 LIST_HEAD(tomoyo_domain_list); 187 188 /** 189 * tomoyo_last_word - Get last component of a domainname. 190 * 191 * @name: Domainname to check. 192 * 193 * Returns the last word of @domainname. 194 */ 195 static const char *tomoyo_last_word(const char *name) 196 { 197 const char *cp = strrchr(name, ' '); 198 if (cp) 199 return cp + 1; 200 return name; 201 } 202 203 /** 204 * tomoyo_same_transition_control - Check for duplicated "struct tomoyo_transition_control" entry. 205 * 206 * @a: Pointer to "struct tomoyo_acl_head". 207 * @b: Pointer to "struct tomoyo_acl_head". 208 * 209 * Returns true if @a == @b, false otherwise. 210 */ 211 static bool tomoyo_same_transition_control(const struct tomoyo_acl_head *a, 212 const struct tomoyo_acl_head *b) 213 { 214 const struct tomoyo_transition_control *p1 = container_of(a, 215 typeof(*p1), 216 head); 217 const struct tomoyo_transition_control *p2 = container_of(b, 218 typeof(*p2), 219 head); 220 return p1->type == p2->type && p1->is_last_name == p2->is_last_name 221 && p1->domainname == p2->domainname 222 && p1->program == p2->program; 223 } 224 225 /** 226 * tomoyo_write_transition_control - Write "struct tomoyo_transition_control" list. 227 * 228 * @param: Pointer to "struct tomoyo_acl_param". 229 * @type: Type of this entry. 230 * 231 * Returns 0 on success, negative value otherwise. 232 */ 233 int tomoyo_write_transition_control(struct tomoyo_acl_param *param, 234 const u8 type) 235 { 236 struct tomoyo_transition_control e = { .type = type }; 237 int error = param->is_delete ? -ENOENT : -ENOMEM; 238 char *program = param->data; 239 char *domainname = strstr(program, " from "); 240 if (domainname) { 241 *domainname = '\0'; 242 domainname += 6; 243 } else if (type == TOMOYO_TRANSITION_CONTROL_NO_KEEP || 244 type == TOMOYO_TRANSITION_CONTROL_KEEP) { 245 domainname = program; 246 program = NULL; 247 } 248 if (program && strcmp(program, "any")) { 249 if (!tomoyo_correct_path(program)) 250 return -EINVAL; 251 e.program = tomoyo_get_name(program); 252 if (!e.program) 253 goto out; 254 } 255 if (domainname && strcmp(domainname, "any")) { 256 if (!tomoyo_correct_domain(domainname)) { 257 if (!tomoyo_correct_path(domainname)) 258 goto out; 259 e.is_last_name = true; 260 } 261 e.domainname = tomoyo_get_name(domainname); 262 if (!e.domainname) 263 goto out; 264 } 265 param->list = ¶m->ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL]; 266 error = tomoyo_update_policy(&e.head, sizeof(e), param, 267 tomoyo_same_transition_control); 268 out: 269 tomoyo_put_name(e.domainname); 270 tomoyo_put_name(e.program); 271 return error; 272 } 273 274 /** 275 * tomoyo_scan_transition - Try to find specific domain transition type. 276 * 277 * @list: Pointer to "struct list_head". 278 * @domainname: The name of current domain. 279 * @program: The name of requested program. 280 * @last_name: The last component of @domainname. 281 * @type: One of values in "enum tomoyo_transition_type". 282 * 283 * Returns true if found one, false otherwise. 284 * 285 * Caller holds tomoyo_read_lock(). 286 */ 287 static inline bool tomoyo_scan_transition 288 (const struct list_head *list, const struct tomoyo_path_info *domainname, 289 const struct tomoyo_path_info *program, const char *last_name, 290 const enum tomoyo_transition_type type) 291 { 292 const struct tomoyo_transition_control *ptr; 293 list_for_each_entry_rcu(ptr, list, head.list) { 294 if (ptr->head.is_deleted || ptr->type != type) 295 continue; 296 if (ptr->domainname) { 297 if (!ptr->is_last_name) { 298 if (ptr->domainname != domainname) 299 continue; 300 } else { 301 /* 302 * Use direct strcmp() since this is 303 * unlikely used. 304 */ 305 if (strcmp(ptr->domainname->name, last_name)) 306 continue; 307 } 308 } 309 if (ptr->program && tomoyo_pathcmp(ptr->program, program)) 310 continue; 311 return true; 312 } 313 return false; 314 } 315 316 /** 317 * tomoyo_transition_type - Get domain transition type. 318 * 319 * @ns: Pointer to "struct tomoyo_policy_namespace". 320 * @domainname: The name of current domain. 321 * @program: The name of requested program. 322 * 323 * Returns TOMOYO_TRANSITION_CONTROL_TRANSIT if executing @program causes 324 * domain transition across namespaces, TOMOYO_TRANSITION_CONTROL_INITIALIZE if 325 * executing @program reinitializes domain transition within that namespace, 326 * TOMOYO_TRANSITION_CONTROL_KEEP if executing @program stays at @domainname , 327 * others otherwise. 328 * 329 * Caller holds tomoyo_read_lock(). 330 */ 331 static enum tomoyo_transition_type tomoyo_transition_type 332 (const struct tomoyo_policy_namespace *ns, 333 const struct tomoyo_path_info *domainname, 334 const struct tomoyo_path_info *program) 335 { 336 const char *last_name = tomoyo_last_word(domainname->name); 337 enum tomoyo_transition_type type = TOMOYO_TRANSITION_CONTROL_NO_RESET; 338 while (type < TOMOYO_MAX_TRANSITION_TYPE) { 339 const struct list_head * const list = 340 &ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL]; 341 if (!tomoyo_scan_transition(list, domainname, program, 342 last_name, type)) { 343 type++; 344 continue; 345 } 346 if (type != TOMOYO_TRANSITION_CONTROL_NO_RESET && 347 type != TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE) 348 break; 349 /* 350 * Do not check for reset_domain if no_reset_domain matched. 351 * Do not check for initialize_domain if no_initialize_domain 352 * matched. 353 */ 354 type++; 355 type++; 356 } 357 return type; 358 } 359 360 /** 361 * tomoyo_same_aggregator - Check for duplicated "struct tomoyo_aggregator" entry. 362 * 363 * @a: Pointer to "struct tomoyo_acl_head". 364 * @b: Pointer to "struct tomoyo_acl_head". 365 * 366 * Returns true if @a == @b, false otherwise. 367 */ 368 static bool tomoyo_same_aggregator(const struct tomoyo_acl_head *a, 369 const struct tomoyo_acl_head *b) 370 { 371 const struct tomoyo_aggregator *p1 = container_of(a, typeof(*p1), 372 head); 373 const struct tomoyo_aggregator *p2 = container_of(b, typeof(*p2), 374 head); 375 return p1->original_name == p2->original_name && 376 p1->aggregated_name == p2->aggregated_name; 377 } 378 379 /** 380 * tomoyo_write_aggregator - Write "struct tomoyo_aggregator" list. 381 * 382 * @param: Pointer to "struct tomoyo_acl_param". 383 * 384 * Returns 0 on success, negative value otherwise. 385 * 386 * Caller holds tomoyo_read_lock(). 387 */ 388 int tomoyo_write_aggregator(struct tomoyo_acl_param *param) 389 { 390 struct tomoyo_aggregator e = { }; 391 int error = param->is_delete ? -ENOENT : -ENOMEM; 392 const char *original_name = tomoyo_read_token(param); 393 const char *aggregated_name = tomoyo_read_token(param); 394 if (!tomoyo_correct_word(original_name) || 395 !tomoyo_correct_path(aggregated_name)) 396 return -EINVAL; 397 e.original_name = tomoyo_get_name(original_name); 398 e.aggregated_name = tomoyo_get_name(aggregated_name); 399 if (!e.original_name || !e.aggregated_name || 400 e.aggregated_name->is_patterned) /* No patterns allowed. */ 401 goto out; 402 param->list = ¶m->ns->policy_list[TOMOYO_ID_AGGREGATOR]; 403 error = tomoyo_update_policy(&e.head, sizeof(e), param, 404 tomoyo_same_aggregator); 405 out: 406 tomoyo_put_name(e.original_name); 407 tomoyo_put_name(e.aggregated_name); 408 return error; 409 } 410 411 /** 412 * tomoyo_find_namespace - Find specified namespace. 413 * 414 * @name: Name of namespace to find. 415 * @len: Length of @name. 416 * 417 * Returns pointer to "struct tomoyo_policy_namespace" if found, 418 * NULL otherwise. 419 * 420 * Caller holds tomoyo_read_lock(). 421 */ 422 static struct tomoyo_policy_namespace *tomoyo_find_namespace 423 (const char *name, const unsigned int len) 424 { 425 struct tomoyo_policy_namespace *ns; 426 list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) { 427 if (strncmp(name, ns->name, len) || 428 (name[len] && name[len] != ' ')) 429 continue; 430 return ns; 431 } 432 return NULL; 433 } 434 435 /** 436 * tomoyo_assign_namespace - Create a new namespace. 437 * 438 * @domainname: Name of namespace to create. 439 * 440 * Returns pointer to "struct tomoyo_policy_namespace" on success, 441 * NULL otherwise. 442 * 443 * Caller holds tomoyo_read_lock(). 444 */ 445 struct tomoyo_policy_namespace *tomoyo_assign_namespace(const char *domainname) 446 { 447 struct tomoyo_policy_namespace *ptr; 448 struct tomoyo_policy_namespace *entry; 449 const char *cp = domainname; 450 unsigned int len = 0; 451 while (*cp && *cp++ != ' ') 452 len++; 453 ptr = tomoyo_find_namespace(domainname, len); 454 if (ptr) 455 return ptr; 456 if (len >= TOMOYO_EXEC_TMPSIZE - 10 || !tomoyo_domain_def(domainname)) 457 return NULL; 458 entry = kzalloc(sizeof(*entry) + len + 1, GFP_NOFS); 459 if (!entry) 460 return NULL; 461 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 462 goto out; 463 ptr = tomoyo_find_namespace(domainname, len); 464 if (!ptr && tomoyo_memory_ok(entry)) { 465 char *name = (char *) (entry + 1); 466 ptr = entry; 467 memmove(name, domainname, len); 468 name[len] = '\0'; 469 entry->name = name; 470 tomoyo_init_policy_namespace(entry); 471 entry = NULL; 472 } 473 mutex_unlock(&tomoyo_policy_lock); 474 out: 475 kfree(entry); 476 return ptr; 477 } 478 479 /** 480 * tomoyo_namespace_jump - Check for namespace jump. 481 * 482 * @domainname: Name of domain. 483 * 484 * Returns true if namespace differs, false otherwise. 485 */ 486 static bool tomoyo_namespace_jump(const char *domainname) 487 { 488 const char *namespace = tomoyo_current_namespace()->name; 489 const int len = strlen(namespace); 490 return strncmp(domainname, namespace, len) || 491 (domainname[len] && domainname[len] != ' '); 492 } 493 494 /** 495 * tomoyo_assign_domain - Create a domain or a namespace. 496 * 497 * @domainname: The name of domain. 498 * @transit: True if transit to domain found or created. 499 * 500 * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. 501 * 502 * Caller holds tomoyo_read_lock(). 503 */ 504 struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname, 505 const bool transit) 506 { 507 struct tomoyo_domain_info e = { }; 508 struct tomoyo_domain_info *entry = tomoyo_find_domain(domainname); 509 bool created = false; 510 if (entry) { 511 if (transit) { 512 /* 513 * Since namespace is created at runtime, profiles may 514 * not be created by the moment the process transits to 515 * that domain. Do not perform domain transition if 516 * profile for that domain is not yet created. 517 */ 518 if (tomoyo_policy_loaded && 519 !entry->ns->profile_ptr[entry->profile]) 520 return NULL; 521 } 522 return entry; 523 } 524 /* Requested domain does not exist. */ 525 /* Don't create requested domain if domainname is invalid. */ 526 if (strlen(domainname) >= TOMOYO_EXEC_TMPSIZE - 10 || 527 !tomoyo_correct_domain(domainname)) 528 return NULL; 529 /* 530 * Since definition of profiles and acl_groups may differ across 531 * namespaces, do not inherit "use_profile" and "use_group" settings 532 * by automatically creating requested domain upon domain transition. 533 */ 534 if (transit && tomoyo_namespace_jump(domainname)) 535 return NULL; 536 e.ns = tomoyo_assign_namespace(domainname); 537 if (!e.ns) 538 return NULL; 539 /* 540 * "use_profile" and "use_group" settings for automatically created 541 * domains are inherited from current domain. These are 0 for manually 542 * created domains. 543 */ 544 if (transit) { 545 const struct tomoyo_domain_info *domain = tomoyo_domain(); 546 e.profile = domain->profile; 547 e.group = domain->group; 548 } 549 e.domainname = tomoyo_get_name(domainname); 550 if (!e.domainname) 551 return NULL; 552 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 553 goto out; 554 entry = tomoyo_find_domain(domainname); 555 if (!entry) { 556 entry = tomoyo_commit_ok(&e, sizeof(e)); 557 if (entry) { 558 INIT_LIST_HEAD(&entry->acl_info_list); 559 list_add_tail_rcu(&entry->list, &tomoyo_domain_list); 560 created = true; 561 } 562 } 563 mutex_unlock(&tomoyo_policy_lock); 564 out: 565 tomoyo_put_name(e.domainname); 566 if (entry && transit) { 567 if (created) { 568 struct tomoyo_request_info r; 569 tomoyo_init_request_info(&r, entry, 570 TOMOYO_MAC_FILE_EXECUTE); 571 r.granted = false; 572 tomoyo_write_log(&r, "use_profile %u\n", 573 entry->profile); 574 tomoyo_write_log(&r, "use_group %u\n", entry->group); 575 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES); 576 } 577 } 578 return entry; 579 } 580 581 /** 582 * tomoyo_environ - Check permission for environment variable names. 583 * 584 * @ee: Pointer to "struct tomoyo_execve". 585 * 586 * Returns 0 on success, negative value otherwise. 587 */ 588 static int tomoyo_environ(struct tomoyo_execve *ee) 589 { 590 struct tomoyo_request_info *r = &ee->r; 591 struct linux_binprm *bprm = ee->bprm; 592 /* env_page.data is allocated by tomoyo_dump_page(). */ 593 struct tomoyo_page_dump env_page = { }; 594 char *arg_ptr; /* Size is TOMOYO_EXEC_TMPSIZE bytes */ 595 int arg_len = 0; 596 unsigned long pos = bprm->p; 597 int offset = pos % PAGE_SIZE; 598 int argv_count = bprm->argc; 599 int envp_count = bprm->envc; 600 int error = -ENOMEM; 601 602 ee->r.type = TOMOYO_MAC_ENVIRON; 603 ee->r.profile = r->domain->profile; 604 ee->r.mode = tomoyo_get_mode(r->domain->ns, ee->r.profile, 605 TOMOYO_MAC_ENVIRON); 606 if (!r->mode || !envp_count) 607 return 0; 608 arg_ptr = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); 609 if (!arg_ptr) 610 goto out; 611 while (error == -ENOMEM) { 612 if (!tomoyo_dump_page(bprm, pos, &env_page)) 613 goto out; 614 pos += PAGE_SIZE - offset; 615 /* Read. */ 616 while (argv_count && offset < PAGE_SIZE) { 617 if (!env_page.data[offset++]) 618 argv_count--; 619 } 620 if (argv_count) { 621 offset = 0; 622 continue; 623 } 624 while (offset < PAGE_SIZE) { 625 const unsigned char c = env_page.data[offset++]; 626 627 if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) { 628 if (c == '=') { 629 arg_ptr[arg_len++] = '\0'; 630 } else if (c == '\\') { 631 arg_ptr[arg_len++] = '\\'; 632 arg_ptr[arg_len++] = '\\'; 633 } else if (c > ' ' && c < 127) { 634 arg_ptr[arg_len++] = c; 635 } else { 636 arg_ptr[arg_len++] = '\\'; 637 arg_ptr[arg_len++] = (c >> 6) + '0'; 638 arg_ptr[arg_len++] 639 = ((c >> 3) & 7) + '0'; 640 arg_ptr[arg_len++] = (c & 7) + '0'; 641 } 642 } else { 643 arg_ptr[arg_len] = '\0'; 644 } 645 if (c) 646 continue; 647 if (tomoyo_env_perm(r, arg_ptr)) { 648 error = -EPERM; 649 break; 650 } 651 if (!--envp_count) { 652 error = 0; 653 break; 654 } 655 arg_len = 0; 656 } 657 offset = 0; 658 } 659 out: 660 if (r->mode != TOMOYO_CONFIG_ENFORCING) 661 error = 0; 662 kfree(env_page.data); 663 kfree(arg_ptr); 664 return error; 665 } 666 667 /** 668 * tomoyo_find_next_domain - Find a domain. 669 * 670 * @bprm: Pointer to "struct linux_binprm". 671 * 672 * Returns 0 on success, negative value otherwise. 673 * 674 * Caller holds tomoyo_read_lock(). 675 */ 676 int tomoyo_find_next_domain(struct linux_binprm *bprm) 677 { 678 struct tomoyo_domain_info *old_domain = tomoyo_domain(); 679 struct tomoyo_domain_info *domain = NULL; 680 const char *original_name = bprm->filename; 681 int retval = -ENOMEM; 682 bool reject_on_transition_failure = false; 683 const struct tomoyo_path_info *candidate; 684 struct tomoyo_path_info exename; 685 struct tomoyo_execve *ee = kzalloc(sizeof(*ee), GFP_NOFS); 686 687 if (!ee) 688 return -ENOMEM; 689 ee->tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); 690 if (!ee->tmp) { 691 kfree(ee); 692 return -ENOMEM; 693 } 694 /* ee->dump->data is allocated by tomoyo_dump_page(). */ 695 tomoyo_init_request_info(&ee->r, NULL, TOMOYO_MAC_FILE_EXECUTE); 696 ee->r.ee = ee; 697 ee->bprm = bprm; 698 ee->r.obj = &ee->obj; 699 ee->obj.path1 = bprm->file->f_path; 700 /* Get symlink's pathname of program. */ 701 retval = -ENOENT; 702 exename.name = tomoyo_realpath_nofollow(original_name); 703 if (!exename.name) 704 goto out; 705 tomoyo_fill_path_info(&exename); 706 retry: 707 /* Check 'aggregator' directive. */ 708 { 709 struct tomoyo_aggregator *ptr; 710 struct list_head *list = 711 &old_domain->ns->policy_list[TOMOYO_ID_AGGREGATOR]; 712 /* Check 'aggregator' directive. */ 713 candidate = &exename; 714 list_for_each_entry_rcu(ptr, list, head.list) { 715 if (ptr->head.is_deleted || 716 !tomoyo_path_matches_pattern(&exename, 717 ptr->original_name)) 718 continue; 719 candidate = ptr->aggregated_name; 720 break; 721 } 722 } 723 724 /* Check execute permission. */ 725 retval = tomoyo_execute_permission(&ee->r, candidate); 726 if (retval == TOMOYO_RETRY_REQUEST) 727 goto retry; 728 if (retval < 0) 729 goto out; 730 /* 731 * To be able to specify domainnames with wildcards, use the 732 * pathname specified in the policy (which may contain 733 * wildcard) rather than the pathname passed to execve() 734 * (which never contains wildcard). 735 */ 736 if (ee->r.param.path.matched_path) 737 candidate = ee->r.param.path.matched_path; 738 739 /* 740 * Check for domain transition preference if "file execute" matched. 741 * If preference is given, make do_execve() fail if domain transition 742 * has failed, for domain transition preference should be used with 743 * destination domain defined. 744 */ 745 if (ee->transition) { 746 const char *domainname = ee->transition->name; 747 reject_on_transition_failure = true; 748 if (!strcmp(domainname, "keep")) 749 goto force_keep_domain; 750 if (!strcmp(domainname, "child")) 751 goto force_child_domain; 752 if (!strcmp(domainname, "reset")) 753 goto force_reset_domain; 754 if (!strcmp(domainname, "initialize")) 755 goto force_initialize_domain; 756 if (!strcmp(domainname, "parent")) { 757 char *cp; 758 strncpy(ee->tmp, old_domain->domainname->name, 759 TOMOYO_EXEC_TMPSIZE - 1); 760 cp = strrchr(ee->tmp, ' '); 761 if (cp) 762 *cp = '\0'; 763 } else if (*domainname == '<') 764 strncpy(ee->tmp, domainname, TOMOYO_EXEC_TMPSIZE - 1); 765 else 766 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", 767 old_domain->domainname->name, domainname); 768 goto force_jump_domain; 769 } 770 /* 771 * No domain transition preference specified. 772 * Calculate domain to transit to. 773 */ 774 switch (tomoyo_transition_type(old_domain->ns, old_domain->domainname, 775 candidate)) { 776 case TOMOYO_TRANSITION_CONTROL_RESET: 777 force_reset_domain: 778 /* Transit to the root of specified namespace. */ 779 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>", 780 candidate->name); 781 /* 782 * Make do_execve() fail if domain transition across namespaces 783 * has failed. 784 */ 785 reject_on_transition_failure = true; 786 break; 787 case TOMOYO_TRANSITION_CONTROL_INITIALIZE: 788 force_initialize_domain: 789 /* Transit to the child of current namespace's root. */ 790 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", 791 old_domain->ns->name, candidate->name); 792 break; 793 case TOMOYO_TRANSITION_CONTROL_KEEP: 794 force_keep_domain: 795 /* Keep current domain. */ 796 domain = old_domain; 797 break; 798 default: 799 if (old_domain == &tomoyo_kernel_domain && 800 !tomoyo_policy_loaded) { 801 /* 802 * Needn't to transit from kernel domain before 803 * starting /sbin/init. But transit from kernel domain 804 * if executing initializers because they might start 805 * before /sbin/init. 806 */ 807 domain = old_domain; 808 break; 809 } 810 force_child_domain: 811 /* Normal domain transition. */ 812 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", 813 old_domain->domainname->name, candidate->name); 814 break; 815 } 816 force_jump_domain: 817 if (!domain) 818 domain = tomoyo_assign_domain(ee->tmp, true); 819 if (domain) 820 retval = 0; 821 else if (reject_on_transition_failure) { 822 printk(KERN_WARNING "ERROR: Domain '%s' not ready.\n", 823 ee->tmp); 824 retval = -ENOMEM; 825 } else if (ee->r.mode == TOMOYO_CONFIG_ENFORCING) 826 retval = -ENOMEM; 827 else { 828 retval = 0; 829 if (!old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED]) { 830 old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED] = true; 831 ee->r.granted = false; 832 tomoyo_write_log(&ee->r, "%s", tomoyo_dif 833 [TOMOYO_DIF_TRANSITION_FAILED]); 834 printk(KERN_WARNING 835 "ERROR: Domain '%s' not defined.\n", ee->tmp); 836 } 837 } 838 out: 839 if (!domain) 840 domain = old_domain; 841 /* Update reference count on "struct tomoyo_domain_info". */ 842 atomic_inc(&domain->users); 843 bprm->cred->security = domain; 844 kfree(exename.name); 845 if (!retval) { 846 ee->r.domain = domain; 847 retval = tomoyo_environ(ee); 848 } 849 kfree(ee->tmp); 850 kfree(ee->dump.data); 851 kfree(ee); 852 return retval; 853 } 854 855 /** 856 * tomoyo_dump_page - Dump a page to buffer. 857 * 858 * @bprm: Pointer to "struct linux_binprm". 859 * @pos: Location to dump. 860 * @dump: Poiner to "struct tomoyo_page_dump". 861 * 862 * Returns true on success, false otherwise. 863 */ 864 bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos, 865 struct tomoyo_page_dump *dump) 866 { 867 struct page *page; 868 869 /* dump->data is released by tomoyo_find_next_domain(). */ 870 if (!dump->data) { 871 dump->data = kzalloc(PAGE_SIZE, GFP_NOFS); 872 if (!dump->data) 873 return false; 874 } 875 /* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ 876 #ifdef CONFIG_MMU 877 if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) 878 return false; 879 #else 880 page = bprm->page[pos / PAGE_SIZE]; 881 #endif 882 if (page != dump->page) { 883 const unsigned int offset = pos % PAGE_SIZE; 884 /* 885 * Maybe kmap()/kunmap() should be used here. 886 * But remove_arg_zero() uses kmap_atomic()/kunmap_atomic(). 887 * So do I. 888 */ 889 char *kaddr = kmap_atomic(page, KM_USER0); 890 891 dump->page = page; 892 memcpy(dump->data + offset, kaddr + offset, 893 PAGE_SIZE - offset); 894 kunmap_atomic(kaddr, KM_USER0); 895 } 896 /* Same with put_arg_page(page) in fs/exec.c */ 897 #ifdef CONFIG_MMU 898 put_page(page); 899 #endif 900 return true; 901 } 902