common.c revision 1084307ca097745ed6e40a192329b133a49271ac
1/* 2 * security/tomoyo/common.c 3 * 4 * Common functions for TOMOYO. 5 * 6 * Copyright (C) 2005-2010 NTT DATA CORPORATION 7 */ 8 9#include <linux/uaccess.h> 10#include <linux/slab.h> 11#include <linux/security.h> 12#include <linux/hardirq.h> 13#include "common.h" 14 15/* String table for functionality that takes 4 modes. */ 16static const char *tomoyo_mode_4[4] = { 17 "disabled", "learning", "permissive", "enforcing" 18}; 19/* String table for functionality that takes 2 modes. */ 20static const char *tomoyo_mode_2[4] = { 21 "disabled", "enabled", "enabled", "enabled" 22}; 23 24/* 25 * tomoyo_control_array is a static data which contains 26 * 27 * (1) functionality name used by /sys/kernel/security/tomoyo/profile . 28 * (2) initial values for "struct tomoyo_profile". 29 * (3) max values for "struct tomoyo_profile". 30 */ 31static struct { 32 const char *keyword; 33 unsigned int current_value; 34 const unsigned int max_value; 35} tomoyo_control_array[TOMOYO_MAX_CONTROL_INDEX] = { 36 [TOMOYO_MAC_FOR_FILE] = { "MAC_FOR_FILE", 0, 3 }, 37 [TOMOYO_MAX_ACCEPT_ENTRY] = { "MAX_ACCEPT_ENTRY", 2048, INT_MAX }, 38 [TOMOYO_VERBOSE] = { "TOMOYO_VERBOSE", 1, 1 }, 39}; 40 41/* 42 * tomoyo_profile is a structure which is used for holding the mode of access 43 * controls. TOMOYO has 4 modes: disabled, learning, permissive, enforcing. 44 * An administrator can define up to 256 profiles. 45 * The ->profile of "struct tomoyo_domain_info" is used for remembering 46 * the profile's number (0 - 255) assigned to that domain. 47 */ 48static struct tomoyo_profile { 49 unsigned int value[TOMOYO_MAX_CONTROL_INDEX]; 50 const struct tomoyo_path_info *comment; 51} *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES]; 52 53/* Permit policy management by non-root user? */ 54static bool tomoyo_manage_by_non_root; 55 56/* Utility functions. */ 57 58/** 59 * tomoyo_print_name_union - Print a tomoyo_name_union. 60 * 61 * @head: Pointer to "struct tomoyo_io_buffer". 62 * @ptr: Pointer to "struct tomoyo_name_union". 63 * 64 * Returns true on success, false otherwise. 65 */ 66static bool tomoyo_print_name_union(struct tomoyo_io_buffer *head, 67 const struct tomoyo_name_union *ptr) 68{ 69 int pos = head->read_avail; 70 if (pos && head->read_buf[pos - 1] == ' ') 71 head->read_avail--; 72 if (ptr->is_group) 73 return tomoyo_io_printf(head, " @%s", 74 ptr->group->group_name->name); 75 return tomoyo_io_printf(head, " %s", ptr->filename->name); 76} 77 78/** 79 * tomoyo_print_number_union - Print a tomoyo_number_union. 80 * 81 * @head: Pointer to "struct tomoyo_io_buffer". 82 * @ptr: Pointer to "struct tomoyo_number_union". 83 * 84 * Returns true on success, false otherwise. 85 */ 86bool tomoyo_print_number_union(struct tomoyo_io_buffer *head, 87 const struct tomoyo_number_union *ptr) 88{ 89 unsigned long min; 90 unsigned long max; 91 u8 min_type; 92 u8 max_type; 93 if (!tomoyo_io_printf(head, " ")) 94 return false; 95 if (ptr->is_group) 96 return tomoyo_io_printf(head, "@%s", 97 ptr->group->group_name->name); 98 min_type = ptr->min_type; 99 max_type = ptr->max_type; 100 min = ptr->values[0]; 101 max = ptr->values[1]; 102 switch (min_type) { 103 case TOMOYO_VALUE_TYPE_HEXADECIMAL: 104 if (!tomoyo_io_printf(head, "0x%lX", min)) 105 return false; 106 break; 107 case TOMOYO_VALUE_TYPE_OCTAL: 108 if (!tomoyo_io_printf(head, "0%lo", min)) 109 return false; 110 break; 111 default: 112 if (!tomoyo_io_printf(head, "%lu", min)) 113 return false; 114 break; 115 } 116 if (min == max && min_type == max_type) 117 return true; 118 switch (max_type) { 119 case TOMOYO_VALUE_TYPE_HEXADECIMAL: 120 return tomoyo_io_printf(head, "-0x%lX", max); 121 case TOMOYO_VALUE_TYPE_OCTAL: 122 return tomoyo_io_printf(head, "-0%lo", max); 123 default: 124 return tomoyo_io_printf(head, "-%lu", max); 125 } 126} 127 128/** 129 * tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure. 130 * 131 * @head: Pointer to "struct tomoyo_io_buffer". 132 * @fmt: The printf()'s format string, followed by parameters. 133 * 134 * Returns true if output was written, false otherwise. 135 * 136 * The snprintf() will truncate, but tomoyo_io_printf() won't. 137 */ 138bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...) 139{ 140 va_list args; 141 int len; 142 int pos = head->read_avail; 143 int size = head->readbuf_size - pos; 144 145 if (size <= 0) 146 return false; 147 va_start(args, fmt); 148 len = vsnprintf(head->read_buf + pos, size, fmt, args); 149 va_end(args); 150 if (pos + len >= head->readbuf_size) 151 return false; 152 head->read_avail += len; 153 return true; 154} 155 156/** 157 * tomoyo_check_flags - Check mode for specified functionality. 158 * 159 * @domain: Pointer to "struct tomoyo_domain_info". 160 * @index: The functionality to check mode. 161 * 162 * TOMOYO checks only process context. 163 * This code disables TOMOYO's enforcement in case the function is called from 164 * interrupt context. 165 */ 166unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain, 167 const u8 index) 168{ 169 const u8 profile = domain->profile; 170 171 if (WARN_ON(in_interrupt())) 172 return 0; 173 return tomoyo_policy_loaded && index < TOMOYO_MAX_CONTROL_INDEX 174#if TOMOYO_MAX_PROFILES != 256 175 && profile < TOMOYO_MAX_PROFILES 176#endif 177 && tomoyo_profile_ptr[profile] ? 178 tomoyo_profile_ptr[profile]->value[index] : 0; 179} 180 181/** 182 * tomoyo_verbose_mode - Check whether TOMOYO is verbose mode. 183 * 184 * @domain: Pointer to "struct tomoyo_domain_info". 185 * 186 * Returns true if domain policy violation warning should be printed to 187 * console. 188 */ 189bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain) 190{ 191 return tomoyo_check_flags(domain, TOMOYO_VERBOSE) != 0; 192} 193 194/** 195 * tomoyo_find_or_assign_new_profile - Create a new profile. 196 * 197 * @profile: Profile number to create. 198 * 199 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise. 200 */ 201static struct tomoyo_profile *tomoyo_find_or_assign_new_profile(const unsigned 202 int profile) 203{ 204 struct tomoyo_profile *ptr = NULL; 205 int i; 206 207 if (profile >= TOMOYO_MAX_PROFILES) 208 return NULL; 209 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 210 return NULL; 211 ptr = tomoyo_profile_ptr[profile]; 212 if (ptr) 213 goto ok; 214 ptr = kmalloc(sizeof(*ptr), GFP_NOFS); 215 if (!tomoyo_memory_ok(ptr)) { 216 kfree(ptr); 217 ptr = NULL; 218 goto ok; 219 } 220 for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++) 221 ptr->value[i] = tomoyo_control_array[i].current_value; 222 mb(); /* Avoid out-of-order execution. */ 223 tomoyo_profile_ptr[profile] = ptr; 224 ok: 225 mutex_unlock(&tomoyo_policy_lock); 226 return ptr; 227} 228 229/** 230 * tomoyo_write_profile - Write to profile table. 231 * 232 * @head: Pointer to "struct tomoyo_io_buffer". 233 * 234 * Returns 0 on success, negative value otherwise. 235 */ 236static int tomoyo_write_profile(struct tomoyo_io_buffer *head) 237{ 238 char *data = head->write_buf; 239 unsigned int i; 240 unsigned int value; 241 char *cp; 242 struct tomoyo_profile *profile; 243 unsigned long num; 244 245 cp = strchr(data, '-'); 246 if (cp) 247 *cp = '\0'; 248 if (strict_strtoul(data, 10, &num)) 249 return -EINVAL; 250 if (cp) 251 data = cp + 1; 252 profile = tomoyo_find_or_assign_new_profile(num); 253 if (!profile) 254 return -EINVAL; 255 cp = strchr(data, '='); 256 if (!cp) 257 return -EINVAL; 258 *cp = '\0'; 259 if (!strcmp(data, "COMMENT")) { 260 const struct tomoyo_path_info *old_comment = profile->comment; 261 profile->comment = tomoyo_get_name(cp + 1); 262 tomoyo_put_name(old_comment); 263 return 0; 264 } 265 for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++) { 266 if (strcmp(data, tomoyo_control_array[i].keyword)) 267 continue; 268 if (sscanf(cp + 1, "%u", &value) != 1) { 269 int j; 270 const char **modes; 271 switch (i) { 272 case TOMOYO_VERBOSE: 273 modes = tomoyo_mode_2; 274 break; 275 default: 276 modes = tomoyo_mode_4; 277 break; 278 } 279 for (j = 0; j < 4; j++) { 280 if (strcmp(cp + 1, modes[j])) 281 continue; 282 value = j; 283 break; 284 } 285 if (j == 4) 286 return -EINVAL; 287 } else if (value > tomoyo_control_array[i].max_value) { 288 value = tomoyo_control_array[i].max_value; 289 } 290 profile->value[i] = value; 291 return 0; 292 } 293 return -EINVAL; 294} 295 296/** 297 * tomoyo_read_profile - Read from profile table. 298 * 299 * @head: Pointer to "struct tomoyo_io_buffer". 300 * 301 * Returns 0. 302 */ 303static int tomoyo_read_profile(struct tomoyo_io_buffer *head) 304{ 305 static const int total = TOMOYO_MAX_CONTROL_INDEX + 1; 306 int step; 307 308 if (head->read_eof) 309 return 0; 310 for (step = head->read_step; step < TOMOYO_MAX_PROFILES * total; 311 step++) { 312 const u8 index = step / total; 313 u8 type = step % total; 314 const struct tomoyo_profile *profile 315 = tomoyo_profile_ptr[index]; 316 head->read_step = step; 317 if (!profile) 318 continue; 319 if (!type) { /* Print profile' comment tag. */ 320 if (!tomoyo_io_printf(head, "%u-COMMENT=%s\n", 321 index, profile->comment ? 322 profile->comment->name : "")) 323 break; 324 continue; 325 } 326 type--; 327 if (type < TOMOYO_MAX_CONTROL_INDEX) { 328 const unsigned int value = profile->value[type]; 329 const char **modes = NULL; 330 const char *keyword 331 = tomoyo_control_array[type].keyword; 332 switch (tomoyo_control_array[type].max_value) { 333 case 3: 334 modes = tomoyo_mode_4; 335 break; 336 case 1: 337 modes = tomoyo_mode_2; 338 break; 339 } 340 if (modes) { 341 if (!tomoyo_io_printf(head, "%u-%s=%s\n", index, 342 keyword, modes[value])) 343 break; 344 } else { 345 if (!tomoyo_io_printf(head, "%u-%s=%u\n", index, 346 keyword, value)) 347 break; 348 } 349 } 350 } 351 if (step == TOMOYO_MAX_PROFILES * total) 352 head->read_eof = true; 353 return 0; 354} 355 356/* 357 * tomoyo_policy_manager_list is used for holding list of domainnames or 358 * programs which are permitted to modify configuration via 359 * /sys/kernel/security/tomoyo/ interface. 360 * 361 * An entry is added by 362 * 363 * # echo '<kernel> /sbin/mingetty /bin/login /bin/bash' > \ 364 * /sys/kernel/security/tomoyo/manager 365 * (if you want to specify by a domainname) 366 * 367 * or 368 * 369 * # echo '/usr/sbin/tomoyo-editpolicy' > /sys/kernel/security/tomoyo/manager 370 * (if you want to specify by a program's location) 371 * 372 * and is deleted by 373 * 374 * # echo 'delete <kernel> /sbin/mingetty /bin/login /bin/bash' > \ 375 * /sys/kernel/security/tomoyo/manager 376 * 377 * or 378 * 379 * # echo 'delete /usr/sbin/tomoyo-editpolicy' > \ 380 * /sys/kernel/security/tomoyo/manager 381 * 382 * and all entries are retrieved by 383 * 384 * # cat /sys/kernel/security/tomoyo/manager 385 */ 386LIST_HEAD(tomoyo_policy_manager_list); 387 388/** 389 * tomoyo_update_manager_entry - Add a manager entry. 390 * 391 * @manager: The path to manager or the domainnamme. 392 * @is_delete: True if it is a delete request. 393 * 394 * Returns 0 on success, negative value otherwise. 395 * 396 * Caller holds tomoyo_read_lock(). 397 */ 398static int tomoyo_update_manager_entry(const char *manager, 399 const bool is_delete) 400{ 401 struct tomoyo_policy_manager_entry *ptr; 402 struct tomoyo_policy_manager_entry e = { }; 403 int error = is_delete ? -ENOENT : -ENOMEM; 404 405 if (tomoyo_is_domain_def(manager)) { 406 if (!tomoyo_is_correct_domain(manager)) 407 return -EINVAL; 408 e.is_domain = true; 409 } else { 410 if (!tomoyo_is_correct_path(manager)) 411 return -EINVAL; 412 } 413 e.manager = tomoyo_get_name(manager); 414 if (!e.manager) 415 return -ENOMEM; 416 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 417 goto out; 418 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) { 419 if (ptr->manager != e.manager) 420 continue; 421 ptr->is_deleted = is_delete; 422 error = 0; 423 break; 424 } 425 if (!is_delete && error) { 426 struct tomoyo_policy_manager_entry *entry = 427 tomoyo_commit_ok(&e, sizeof(e)); 428 if (entry) { 429 list_add_tail_rcu(&entry->list, 430 &tomoyo_policy_manager_list); 431 error = 0; 432 } 433 } 434 mutex_unlock(&tomoyo_policy_lock); 435 out: 436 tomoyo_put_name(e.manager); 437 return error; 438} 439 440/** 441 * tomoyo_write_manager_policy - Write manager policy. 442 * 443 * @head: Pointer to "struct tomoyo_io_buffer". 444 * 445 * Returns 0 on success, negative value otherwise. 446 * 447 * Caller holds tomoyo_read_lock(). 448 */ 449static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head) 450{ 451 char *data = head->write_buf; 452 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); 453 454 if (!strcmp(data, "manage_by_non_root")) { 455 tomoyo_manage_by_non_root = !is_delete; 456 return 0; 457 } 458 return tomoyo_update_manager_entry(data, is_delete); 459} 460 461/** 462 * tomoyo_read_manager_policy - Read manager policy. 463 * 464 * @head: Pointer to "struct tomoyo_io_buffer". 465 * 466 * Returns 0. 467 * 468 * Caller holds tomoyo_read_lock(). 469 */ 470static int tomoyo_read_manager_policy(struct tomoyo_io_buffer *head) 471{ 472 struct list_head *pos; 473 bool done = true; 474 475 if (head->read_eof) 476 return 0; 477 list_for_each_cookie(pos, head->read_var2, 478 &tomoyo_policy_manager_list) { 479 struct tomoyo_policy_manager_entry *ptr; 480 ptr = list_entry(pos, struct tomoyo_policy_manager_entry, 481 list); 482 if (ptr->is_deleted) 483 continue; 484 done = tomoyo_io_printf(head, "%s\n", ptr->manager->name); 485 if (!done) 486 break; 487 } 488 head->read_eof = done; 489 return 0; 490} 491 492/** 493 * tomoyo_is_policy_manager - Check whether the current process is a policy manager. 494 * 495 * Returns true if the current process is permitted to modify policy 496 * via /sys/kernel/security/tomoyo/ interface. 497 * 498 * Caller holds tomoyo_read_lock(). 499 */ 500static bool tomoyo_is_policy_manager(void) 501{ 502 struct tomoyo_policy_manager_entry *ptr; 503 const char *exe; 504 const struct task_struct *task = current; 505 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname; 506 bool found = false; 507 508 if (!tomoyo_policy_loaded) 509 return true; 510 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid)) 511 return false; 512 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) { 513 if (!ptr->is_deleted && ptr->is_domain 514 && !tomoyo_pathcmp(domainname, ptr->manager)) { 515 found = true; 516 break; 517 } 518 } 519 if (found) 520 return true; 521 exe = tomoyo_get_exe(); 522 if (!exe) 523 return false; 524 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) { 525 if (!ptr->is_deleted && !ptr->is_domain 526 && !strcmp(exe, ptr->manager->name)) { 527 found = true; 528 break; 529 } 530 } 531 if (!found) { /* Reduce error messages. */ 532 static pid_t last_pid; 533 const pid_t pid = current->pid; 534 if (last_pid != pid) { 535 printk(KERN_WARNING "%s ( %s ) is not permitted to " 536 "update policies.\n", domainname->name, exe); 537 last_pid = pid; 538 } 539 } 540 kfree(exe); 541 return found; 542} 543 544/** 545 * tomoyo_is_select_one - Parse select command. 546 * 547 * @head: Pointer to "struct tomoyo_io_buffer". 548 * @data: String to parse. 549 * 550 * Returns true on success, false otherwise. 551 * 552 * Caller holds tomoyo_read_lock(). 553 */ 554static bool tomoyo_is_select_one(struct tomoyo_io_buffer *head, 555 const char *data) 556{ 557 unsigned int pid; 558 struct tomoyo_domain_info *domain = NULL; 559 bool global_pid = false; 560 561 if (sscanf(data, "pid=%u", &pid) == 1 || 562 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { 563 struct task_struct *p; 564 rcu_read_lock(); 565 read_lock(&tasklist_lock); 566 if (global_pid) 567 p = find_task_by_pid_ns(pid, &init_pid_ns); 568 else 569 p = find_task_by_vpid(pid); 570 if (p) 571 domain = tomoyo_real_domain(p); 572 read_unlock(&tasklist_lock); 573 rcu_read_unlock(); 574 } else if (!strncmp(data, "domain=", 7)) { 575 if (tomoyo_is_domain_def(data + 7)) 576 domain = tomoyo_find_domain(data + 7); 577 } else 578 return false; 579 head->write_var1 = domain; 580 /* Accessing read_buf is safe because head->io_sem is held. */ 581 if (!head->read_buf) 582 return true; /* Do nothing if open(O_WRONLY). */ 583 head->read_avail = 0; 584 tomoyo_io_printf(head, "# select %s\n", data); 585 head->read_single_domain = true; 586 head->read_eof = !domain; 587 if (domain) { 588 struct tomoyo_domain_info *d; 589 head->read_var1 = NULL; 590 list_for_each_entry_rcu(d, &tomoyo_domain_list, list) { 591 if (d == domain) 592 break; 593 head->read_var1 = &d->list; 594 } 595 head->read_var2 = NULL; 596 head->read_bit = 0; 597 head->read_step = 0; 598 if (domain->is_deleted) 599 tomoyo_io_printf(head, "# This is a deleted domain.\n"); 600 } 601 return true; 602} 603 604/** 605 * tomoyo_delete_domain - Delete a domain. 606 * 607 * @domainname: The name of domain. 608 * 609 * Returns 0. 610 * 611 * Caller holds tomoyo_read_lock(). 612 */ 613static int tomoyo_delete_domain(char *domainname) 614{ 615 struct tomoyo_domain_info *domain; 616 struct tomoyo_path_info name; 617 618 name.name = domainname; 619 tomoyo_fill_path_info(&name); 620 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 621 return 0; 622 /* Is there an active domain? */ 623 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 624 /* Never delete tomoyo_kernel_domain */ 625 if (domain == &tomoyo_kernel_domain) 626 continue; 627 if (domain->is_deleted || 628 tomoyo_pathcmp(domain->domainname, &name)) 629 continue; 630 domain->is_deleted = true; 631 break; 632 } 633 mutex_unlock(&tomoyo_policy_lock); 634 return 0; 635} 636 637/** 638 * tomoyo_write_domain_policy2 - Write domain policy. 639 * 640 * @head: Pointer to "struct tomoyo_io_buffer". 641 * 642 * Returns 0 on success, negative value otherwise. 643 * 644 * Caller holds tomoyo_read_lock(). 645 */ 646static int tomoyo_write_domain_policy2(char *data, 647 struct tomoyo_domain_info *domain, 648 const bool is_delete) 649{ 650 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT)) 651 return tomoyo_write_mount_policy(data, domain, is_delete); 652 return tomoyo_write_file_policy(data, domain, is_delete); 653} 654 655/** 656 * tomoyo_write_domain_policy - Write domain policy. 657 * 658 * @head: Pointer to "struct tomoyo_io_buffer". 659 * 660 * Returns 0 on success, negative value otherwise. 661 * 662 * Caller holds tomoyo_read_lock(). 663 */ 664static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head) 665{ 666 char *data = head->write_buf; 667 struct tomoyo_domain_info *domain = head->write_var1; 668 bool is_delete = false; 669 bool is_select = false; 670 unsigned int profile; 671 672 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE)) 673 is_delete = true; 674 else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT)) 675 is_select = true; 676 if (is_select && tomoyo_is_select_one(head, data)) 677 return 0; 678 /* Don't allow updating policies by non manager programs. */ 679 if (!tomoyo_is_policy_manager()) 680 return -EPERM; 681 if (tomoyo_is_domain_def(data)) { 682 domain = NULL; 683 if (is_delete) 684 tomoyo_delete_domain(data); 685 else if (is_select) 686 domain = tomoyo_find_domain(data); 687 else 688 domain = tomoyo_find_or_assign_new_domain(data, 0); 689 head->write_var1 = domain; 690 return 0; 691 } 692 if (!domain) 693 return -EINVAL; 694 695 if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1 696 && profile < TOMOYO_MAX_PROFILES) { 697 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded) 698 domain->profile = (u8) profile; 699 return 0; 700 } 701 if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) { 702 domain->ignore_global_allow_read = !is_delete; 703 return 0; 704 } 705 if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) { 706 domain->quota_warned = !is_delete; 707 return 0; 708 } 709 if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) { 710 domain->transition_failed = !is_delete; 711 return 0; 712 } 713 return tomoyo_write_domain_policy2(data, domain, is_delete); 714} 715 716/** 717 * tomoyo_print_path_acl - Print a single path ACL entry. 718 * 719 * @head: Pointer to "struct tomoyo_io_buffer". 720 * @ptr: Pointer to "struct tomoyo_path_acl". 721 * 722 * Returns true on success, false otherwise. 723 */ 724static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head, 725 struct tomoyo_path_acl *ptr) 726{ 727 int pos; 728 u8 bit; 729 const u16 perm = ptr->perm; 730 731 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { 732 if (!(perm & (1 << bit))) 733 continue; 734 /* Print "read/write" instead of "read" and "write". */ 735 if ((bit == TOMOYO_TYPE_READ || bit == TOMOYO_TYPE_WRITE) 736 && (perm & (1 << TOMOYO_TYPE_READ_WRITE))) 737 continue; 738 pos = head->read_avail; 739 if (!tomoyo_io_printf(head, "allow_%s ", 740 tomoyo_path2keyword(bit)) || 741 !tomoyo_print_name_union(head, &ptr->name) || 742 !tomoyo_io_printf(head, "\n")) 743 goto out; 744 } 745 head->read_bit = 0; 746 return true; 747 out: 748 head->read_bit = bit; 749 head->read_avail = pos; 750 return false; 751} 752 753/** 754 * tomoyo_print_path2_acl - Print a double path ACL entry. 755 * 756 * @head: Pointer to "struct tomoyo_io_buffer". 757 * @ptr: Pointer to "struct tomoyo_path2_acl". 758 * 759 * Returns true on success, false otherwise. 760 */ 761static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head, 762 struct tomoyo_path2_acl *ptr) 763{ 764 int pos; 765 const u8 perm = ptr->perm; 766 u8 bit; 767 768 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) { 769 if (!(perm & (1 << bit))) 770 continue; 771 pos = head->read_avail; 772 if (!tomoyo_io_printf(head, "allow_%s ", 773 tomoyo_path22keyword(bit)) || 774 !tomoyo_print_name_union(head, &ptr->name1) || 775 !tomoyo_print_name_union(head, &ptr->name2) || 776 !tomoyo_io_printf(head, "\n")) 777 goto out; 778 } 779 head->read_bit = 0; 780 return true; 781 out: 782 head->read_bit = bit; 783 head->read_avail = pos; 784 return false; 785} 786 787/** 788 * tomoyo_print_path_number_acl - Print a path_number ACL entry. 789 * 790 * @head: Pointer to "struct tomoyo_io_buffer". 791 * @ptr: Pointer to "struct tomoyo_path_number_acl". 792 * 793 * Returns true on success, false otherwise. 794 */ 795static bool tomoyo_print_path_number_acl(struct tomoyo_io_buffer *head, 796 struct tomoyo_path_number_acl *ptr) 797{ 798 int pos; 799 u8 bit; 800 const u8 perm = ptr->perm; 801 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; 802 bit++) { 803 if (!(perm & (1 << bit))) 804 continue; 805 pos = head->read_avail; 806 if (!tomoyo_io_printf(head, "allow_%s", 807 tomoyo_path_number2keyword(bit)) || 808 !tomoyo_print_name_union(head, &ptr->name) || 809 !tomoyo_print_number_union(head, &ptr->number) || 810 !tomoyo_io_printf(head, "\n")) 811 goto out; 812 } 813 head->read_bit = 0; 814 return true; 815 out: 816 head->read_bit = bit; 817 head->read_avail = pos; 818 return false; 819} 820 821/** 822 * tomoyo_print_path_number3_acl - Print a path_number3 ACL entry. 823 * 824 * @head: Pointer to "struct tomoyo_io_buffer". 825 * @ptr: Pointer to "struct tomoyo_path_number3_acl". 826 * 827 * Returns true on success, false otherwise. 828 */ 829static bool tomoyo_print_path_number3_acl(struct tomoyo_io_buffer *head, 830 struct tomoyo_path_number3_acl *ptr) 831{ 832 int pos; 833 u8 bit; 834 const u16 perm = ptr->perm; 835 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER3_OPERATION; 836 bit++) { 837 if (!(perm & (1 << bit))) 838 continue; 839 pos = head->read_avail; 840 if (!tomoyo_io_printf(head, "allow_%s", 841 tomoyo_path_number32keyword(bit)) || 842 !tomoyo_print_name_union(head, &ptr->name) || 843 !tomoyo_print_number_union(head, &ptr->mode) || 844 !tomoyo_print_number_union(head, &ptr->major) || 845 !tomoyo_print_number_union(head, &ptr->minor) || 846 !tomoyo_io_printf(head, "\n")) 847 goto out; 848 } 849 head->read_bit = 0; 850 return true; 851 out: 852 head->read_bit = bit; 853 head->read_avail = pos; 854 return false; 855} 856 857/** 858 * tomoyo_print_mount_acl - Print a mount ACL entry. 859 * 860 * @head: Pointer to "struct tomoyo_io_buffer". 861 * @ptr: Pointer to "struct tomoyo_mount_acl". 862 * 863 * Returns true on success, false otherwise. 864 */ 865static bool tomoyo_print_mount_acl(struct tomoyo_io_buffer *head, 866 struct tomoyo_mount_acl *ptr) 867{ 868 const int pos = head->read_avail; 869 if (ptr->is_deleted) 870 return true; 871 if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_MOUNT) || 872 !tomoyo_print_name_union(head, &ptr->dev_name) || 873 !tomoyo_print_name_union(head, &ptr->dir_name) || 874 !tomoyo_print_name_union(head, &ptr->fs_type) || 875 !tomoyo_print_number_union(head, &ptr->flags) || 876 !tomoyo_io_printf(head, "\n")) { 877 head->read_avail = pos; 878 return false; 879 } 880 return true; 881} 882 883/** 884 * tomoyo_print_entry - Print an ACL entry. 885 * 886 * @head: Pointer to "struct tomoyo_io_buffer". 887 * @ptr: Pointer to an ACL entry. 888 * 889 * Returns true on success, false otherwise. 890 */ 891static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, 892 struct tomoyo_acl_info *ptr) 893{ 894 const u8 acl_type = ptr->type; 895 896 if (acl_type == TOMOYO_TYPE_PATH_ACL) { 897 struct tomoyo_path_acl *acl 898 = container_of(ptr, struct tomoyo_path_acl, head); 899 return tomoyo_print_path_acl(head, acl); 900 } 901 if (acl_type == TOMOYO_TYPE_PATH2_ACL) { 902 struct tomoyo_path2_acl *acl 903 = container_of(ptr, struct tomoyo_path2_acl, head); 904 return tomoyo_print_path2_acl(head, acl); 905 } 906 if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) { 907 struct tomoyo_path_number_acl *acl 908 = container_of(ptr, struct tomoyo_path_number_acl, 909 head); 910 return tomoyo_print_path_number_acl(head, acl); 911 } 912 if (acl_type == TOMOYO_TYPE_PATH_NUMBER3_ACL) { 913 struct tomoyo_path_number3_acl *acl 914 = container_of(ptr, struct tomoyo_path_number3_acl, 915 head); 916 return tomoyo_print_path_number3_acl(head, acl); 917 } 918 if (acl_type == TOMOYO_TYPE_MOUNT_ACL) { 919 struct tomoyo_mount_acl *acl 920 = container_of(ptr, struct tomoyo_mount_acl, head); 921 return tomoyo_print_mount_acl(head, acl); 922 } 923 BUG(); /* This must not happen. */ 924 return false; 925} 926 927/** 928 * tomoyo_read_domain_policy - Read domain policy. 929 * 930 * @head: Pointer to "struct tomoyo_io_buffer". 931 * 932 * Returns 0. 933 * 934 * Caller holds tomoyo_read_lock(). 935 */ 936static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head) 937{ 938 struct list_head *dpos; 939 struct list_head *apos; 940 bool done = true; 941 942 if (head->read_eof) 943 return 0; 944 if (head->read_step == 0) 945 head->read_step = 1; 946 list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) { 947 struct tomoyo_domain_info *domain; 948 const char *quota_exceeded = ""; 949 const char *transition_failed = ""; 950 const char *ignore_global_allow_read = ""; 951 domain = list_entry(dpos, struct tomoyo_domain_info, list); 952 if (head->read_step != 1) 953 goto acl_loop; 954 if (domain->is_deleted && !head->read_single_domain) 955 continue; 956 /* Print domainname and flags. */ 957 if (domain->quota_warned) 958 quota_exceeded = "quota_exceeded\n"; 959 if (domain->transition_failed) 960 transition_failed = "transition_failed\n"; 961 if (domain->ignore_global_allow_read) 962 ignore_global_allow_read 963 = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n"; 964 done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE 965 "%u\n%s%s%s\n", 966 domain->domainname->name, 967 domain->profile, quota_exceeded, 968 transition_failed, 969 ignore_global_allow_read); 970 if (!done) 971 break; 972 head->read_step = 2; 973acl_loop: 974 if (head->read_step == 3) 975 goto tail_mark; 976 /* Print ACL entries in the domain. */ 977 list_for_each_cookie(apos, head->read_var2, 978 &domain->acl_info_list) { 979 struct tomoyo_acl_info *ptr 980 = list_entry(apos, struct tomoyo_acl_info, 981 list); 982 done = tomoyo_print_entry(head, ptr); 983 if (!done) 984 break; 985 } 986 if (!done) 987 break; 988 head->read_step = 3; 989tail_mark: 990 done = tomoyo_io_printf(head, "\n"); 991 if (!done) 992 break; 993 head->read_step = 1; 994 if (head->read_single_domain) 995 break; 996 } 997 head->read_eof = done; 998 return 0; 999} 1000 1001/** 1002 * tomoyo_write_domain_profile - Assign profile for specified domain. 1003 * 1004 * @head: Pointer to "struct tomoyo_io_buffer". 1005 * 1006 * Returns 0 on success, -EINVAL otherwise. 1007 * 1008 * This is equivalent to doing 1009 * 1010 * ( echo "select " $domainname; echo "use_profile " $profile ) | 1011 * /usr/sbin/tomoyo-loadpolicy -d 1012 * 1013 * Caller holds tomoyo_read_lock(). 1014 */ 1015static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head) 1016{ 1017 char *data = head->write_buf; 1018 char *cp = strchr(data, ' '); 1019 struct tomoyo_domain_info *domain; 1020 unsigned long profile; 1021 1022 if (!cp) 1023 return -EINVAL; 1024 *cp = '\0'; 1025 domain = tomoyo_find_domain(cp + 1); 1026 if (strict_strtoul(data, 10, &profile)) 1027 return -EINVAL; 1028 if (domain && profile < TOMOYO_MAX_PROFILES 1029 && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)) 1030 domain->profile = (u8) profile; 1031 return 0; 1032} 1033 1034/** 1035 * tomoyo_read_domain_profile - Read only domainname and profile. 1036 * 1037 * @head: Pointer to "struct tomoyo_io_buffer". 1038 * 1039 * Returns list of profile number and domainname pairs. 1040 * 1041 * This is equivalent to doing 1042 * 1043 * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy | 1044 * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) 1045 * domainname = $0; } else if ( $1 == "use_profile" ) { 1046 * print $2 " " domainname; domainname = ""; } } ; ' 1047 * 1048 * Caller holds tomoyo_read_lock(). 1049 */ 1050static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head) 1051{ 1052 struct list_head *pos; 1053 bool done = true; 1054 1055 if (head->read_eof) 1056 return 0; 1057 list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) { 1058 struct tomoyo_domain_info *domain; 1059 domain = list_entry(pos, struct tomoyo_domain_info, list); 1060 if (domain->is_deleted) 1061 continue; 1062 done = tomoyo_io_printf(head, "%u %s\n", domain->profile, 1063 domain->domainname->name); 1064 if (!done) 1065 break; 1066 } 1067 head->read_eof = done; 1068 return 0; 1069} 1070 1071/** 1072 * tomoyo_write_pid: Specify PID to obtain domainname. 1073 * 1074 * @head: Pointer to "struct tomoyo_io_buffer". 1075 * 1076 * Returns 0. 1077 */ 1078static int tomoyo_write_pid(struct tomoyo_io_buffer *head) 1079{ 1080 unsigned long pid; 1081 /* No error check. */ 1082 strict_strtoul(head->write_buf, 10, &pid); 1083 head->read_step = (int) pid; 1084 head->read_eof = false; 1085 return 0; 1086} 1087 1088/** 1089 * tomoyo_read_pid - Get domainname of the specified PID. 1090 * 1091 * @head: Pointer to "struct tomoyo_io_buffer". 1092 * 1093 * Returns the domainname which the specified PID is in on success, 1094 * empty string otherwise. 1095 * The PID is specified by tomoyo_write_pid() so that the user can obtain 1096 * using read()/write() interface rather than sysctl() interface. 1097 */ 1098static int tomoyo_read_pid(struct tomoyo_io_buffer *head) 1099{ 1100 if (head->read_avail == 0 && !head->read_eof) { 1101 const int pid = head->read_step; 1102 struct task_struct *p; 1103 struct tomoyo_domain_info *domain = NULL; 1104 rcu_read_lock(); 1105 read_lock(&tasklist_lock); 1106 p = find_task_by_vpid(pid); 1107 if (p) 1108 domain = tomoyo_real_domain(p); 1109 read_unlock(&tasklist_lock); 1110 rcu_read_unlock(); 1111 if (domain) 1112 tomoyo_io_printf(head, "%d %u %s", pid, domain->profile, 1113 domain->domainname->name); 1114 head->read_eof = true; 1115 } 1116 return 0; 1117} 1118 1119/** 1120 * tomoyo_write_exception_policy - Write exception policy. 1121 * 1122 * @head: Pointer to "struct tomoyo_io_buffer". 1123 * 1124 * Returns 0 on success, negative value otherwise. 1125 * 1126 * Caller holds tomoyo_read_lock(). 1127 */ 1128static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head) 1129{ 1130 char *data = head->write_buf; 1131 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); 1132 1133 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN)) 1134 return tomoyo_write_domain_keeper_policy(data, false, 1135 is_delete); 1136 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN)) 1137 return tomoyo_write_domain_keeper_policy(data, true, is_delete); 1138 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN)) 1139 return tomoyo_write_domain_initializer_policy(data, false, 1140 is_delete); 1141 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN)) 1142 return tomoyo_write_domain_initializer_policy(data, true, 1143 is_delete); 1144 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_AGGREGATOR)) 1145 return tomoyo_write_aggregator_policy(data, is_delete); 1146 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS)) 1147 return tomoyo_write_alias_policy(data, is_delete); 1148 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ)) 1149 return tomoyo_write_globally_readable_policy(data, is_delete); 1150 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN)) 1151 return tomoyo_write_pattern_policy(data, is_delete); 1152 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE)) 1153 return tomoyo_write_no_rewrite_policy(data, is_delete); 1154 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP)) 1155 return tomoyo_write_path_group_policy(data, is_delete); 1156 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP)) 1157 return tomoyo_write_number_group_policy(data, is_delete); 1158 return -EINVAL; 1159} 1160 1161/** 1162 * tomoyo_read_exception_policy - Read exception policy. 1163 * 1164 * @head: Pointer to "struct tomoyo_io_buffer". 1165 * 1166 * Returns 0 on success, -EINVAL otherwise. 1167 * 1168 * Caller holds tomoyo_read_lock(). 1169 */ 1170static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head) 1171{ 1172 if (!head->read_eof) { 1173 switch (head->read_step) { 1174 case 0: 1175 head->read_var2 = NULL; 1176 head->read_step = 1; 1177 case 1: 1178 if (!tomoyo_read_domain_keeper_policy(head)) 1179 break; 1180 head->read_var2 = NULL; 1181 head->read_step = 2; 1182 case 2: 1183 if (!tomoyo_read_globally_readable_policy(head)) 1184 break; 1185 head->read_var2 = NULL; 1186 head->read_step = 3; 1187 case 3: 1188 head->read_var2 = NULL; 1189 head->read_step = 4; 1190 case 4: 1191 if (!tomoyo_read_domain_initializer_policy(head)) 1192 break; 1193 head->read_var2 = NULL; 1194 head->read_step = 5; 1195 case 5: 1196 if (!tomoyo_read_alias_policy(head)) 1197 break; 1198 head->read_var2 = NULL; 1199 head->read_step = 6; 1200 case 6: 1201 if (!tomoyo_read_aggregator_policy(head)) 1202 break; 1203 head->read_var2 = NULL; 1204 head->read_step = 7; 1205 case 7: 1206 if (!tomoyo_read_file_pattern(head)) 1207 break; 1208 head->read_var2 = NULL; 1209 head->read_step = 8; 1210 case 8: 1211 if (!tomoyo_read_no_rewrite_policy(head)) 1212 break; 1213 head->read_var2 = NULL; 1214 head->read_step = 9; 1215 case 9: 1216 if (!tomoyo_read_path_group_policy(head)) 1217 break; 1218 head->read_var1 = NULL; 1219 head->read_var2 = NULL; 1220 head->read_step = 10; 1221 case 10: 1222 if (!tomoyo_read_number_group_policy(head)) 1223 break; 1224 head->read_var1 = NULL; 1225 head->read_var2 = NULL; 1226 head->read_step = 11; 1227 case 11: 1228 head->read_eof = true; 1229 break; 1230 default: 1231 return -EINVAL; 1232 } 1233 } 1234 return 0; 1235} 1236 1237/** 1238 * tomoyo_print_header - Get header line of audit log. 1239 * 1240 * @r: Pointer to "struct tomoyo_request_info". 1241 * 1242 * Returns string representation. 1243 * 1244 * This function uses kmalloc(), so caller must kfree() if this function 1245 * didn't return NULL. 1246 */ 1247static char *tomoyo_print_header(struct tomoyo_request_info *r) 1248{ 1249 static const char *tomoyo_mode_4[4] = { 1250 "disabled", "learning", "permissive", "enforcing" 1251 }; 1252 struct timeval tv; 1253 const pid_t gpid = task_pid_nr(current); 1254 static const int tomoyo_buffer_len = 4096; 1255 char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS); 1256 if (!buffer) 1257 return NULL; 1258 do_gettimeofday(&tv); 1259 snprintf(buffer, tomoyo_buffer_len - 1, 1260 "#timestamp=%lu profile=%u mode=%s (global-pid=%u)" 1261 " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u" 1262 " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }", 1263 tv.tv_sec, r->profile, tomoyo_mode_4[r->mode], gpid, 1264 (pid_t) sys_getpid(), (pid_t) sys_getppid(), 1265 current_uid(), current_gid(), current_euid(), 1266 current_egid(), current_suid(), current_sgid(), 1267 current_fsuid(), current_fsgid()); 1268 return buffer; 1269} 1270 1271/** 1272 * tomoyo_init_audit_log - Allocate buffer for audit logs. 1273 * 1274 * @len: Required size. 1275 * @r: Pointer to "struct tomoyo_request_info". 1276 * 1277 * Returns pointer to allocated memory. 1278 * 1279 * The @len is updated to add the header lines' size on success. 1280 * 1281 * This function uses kzalloc(), so caller must kfree() if this function 1282 * didn't return NULL. 1283 */ 1284static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r) 1285{ 1286 char *buf = NULL; 1287 const char *header; 1288 const char *domainname; 1289 if (!r->domain) 1290 r->domain = tomoyo_domain(); 1291 domainname = r->domain->domainname->name; 1292 header = tomoyo_print_header(r); 1293 if (!header) 1294 return NULL; 1295 *len += strlen(domainname) + strlen(header) + 10; 1296 buf = kzalloc(*len, GFP_NOFS); 1297 if (buf) 1298 snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname); 1299 kfree(header); 1300 return buf; 1301} 1302 1303/* Wait queue for tomoyo_query_list. */ 1304static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait); 1305 1306/* Lock for manipulating tomoyo_query_list. */ 1307static DEFINE_SPINLOCK(tomoyo_query_list_lock); 1308 1309/* Structure for query. */ 1310struct tomoyo_query_entry { 1311 struct list_head list; 1312 char *query; 1313 int query_len; 1314 unsigned int serial; 1315 int timer; 1316 int answer; 1317}; 1318 1319/* The list for "struct tomoyo_query_entry". */ 1320static LIST_HEAD(tomoyo_query_list); 1321 1322/* 1323 * Number of "struct file" referring /sys/kernel/security/tomoyo/query 1324 * interface. 1325 */ 1326static atomic_t tomoyo_query_observers = ATOMIC_INIT(0); 1327 1328/** 1329 * tomoyo_supervisor - Ask for the supervisor's decision. 1330 * 1331 * @r: Pointer to "struct tomoyo_request_info". 1332 * @fmt: The printf()'s format string, followed by parameters. 1333 * 1334 * Returns 0 if the supervisor decided to permit the access request which 1335 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the 1336 * supervisor decided to retry the access request which violated the policy in 1337 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise. 1338 */ 1339int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) 1340{ 1341 va_list args; 1342 int error = -EPERM; 1343 int pos; 1344 int len; 1345 static unsigned int tomoyo_serial; 1346 struct tomoyo_query_entry *tomoyo_query_entry = NULL; 1347 bool quota_exceeded = false; 1348 char *header; 1349 switch (r->mode) { 1350 char *buffer; 1351 case TOMOYO_CONFIG_LEARNING: 1352 if (!tomoyo_domain_quota_is_ok(r)) 1353 return 0; 1354 va_start(args, fmt); 1355 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4; 1356 va_end(args); 1357 buffer = kmalloc(len, GFP_NOFS); 1358 if (!buffer) 1359 return 0; 1360 va_start(args, fmt); 1361 vsnprintf(buffer, len - 1, fmt, args); 1362 va_end(args); 1363 tomoyo_normalize_line(buffer); 1364 tomoyo_write_domain_policy2(buffer, r->domain, false); 1365 kfree(buffer); 1366 /* fall through */ 1367 case TOMOYO_CONFIG_PERMISSIVE: 1368 return 0; 1369 } 1370 if (!r->domain) 1371 r->domain = tomoyo_domain(); 1372 if (!atomic_read(&tomoyo_query_observers)) 1373 return -EPERM; 1374 va_start(args, fmt); 1375 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32; 1376 va_end(args); 1377 header = tomoyo_init_audit_log(&len, r); 1378 if (!header) 1379 goto out; 1380 tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS); 1381 if (!tomoyo_query_entry) 1382 goto out; 1383 tomoyo_query_entry->query = kzalloc(len, GFP_NOFS); 1384 if (!tomoyo_query_entry->query) 1385 goto out; 1386 len = ksize(tomoyo_query_entry->query); 1387 INIT_LIST_HEAD(&tomoyo_query_entry->list); 1388 spin_lock(&tomoyo_query_list_lock); 1389 if (tomoyo_quota_for_query && tomoyo_query_memory_size + len + 1390 sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) { 1391 quota_exceeded = true; 1392 } else { 1393 tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry); 1394 tomoyo_query_entry->serial = tomoyo_serial++; 1395 } 1396 spin_unlock(&tomoyo_query_list_lock); 1397 if (quota_exceeded) 1398 goto out; 1399 pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s", 1400 tomoyo_query_entry->serial, r->retry, header); 1401 kfree(header); 1402 header = NULL; 1403 va_start(args, fmt); 1404 vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args); 1405 tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1; 1406 va_end(args); 1407 spin_lock(&tomoyo_query_list_lock); 1408 list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list); 1409 spin_unlock(&tomoyo_query_list_lock); 1410 /* Give 10 seconds for supervisor's opinion. */ 1411 for (tomoyo_query_entry->timer = 0; 1412 atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100; 1413 tomoyo_query_entry->timer++) { 1414 wake_up(&tomoyo_query_wait); 1415 set_current_state(TASK_INTERRUPTIBLE); 1416 schedule_timeout(HZ / 10); 1417 if (tomoyo_query_entry->answer) 1418 break; 1419 } 1420 spin_lock(&tomoyo_query_list_lock); 1421 list_del(&tomoyo_query_entry->list); 1422 tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry); 1423 spin_unlock(&tomoyo_query_list_lock); 1424 switch (tomoyo_query_entry->answer) { 1425 case 3: /* Asked to retry by administrator. */ 1426 error = TOMOYO_RETRY_REQUEST; 1427 r->retry++; 1428 break; 1429 case 1: 1430 /* Granted by administrator. */ 1431 error = 0; 1432 break; 1433 case 0: 1434 /* Timed out. */ 1435 break; 1436 default: 1437 /* Rejected by administrator. */ 1438 break; 1439 } 1440 out: 1441 if (tomoyo_query_entry) 1442 kfree(tomoyo_query_entry->query); 1443 kfree(tomoyo_query_entry); 1444 kfree(header); 1445 return error; 1446} 1447 1448/** 1449 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query. 1450 * 1451 * @file: Pointer to "struct file". 1452 * @wait: Pointer to "poll_table". 1453 * 1454 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. 1455 * 1456 * Waits for access requests which violated policy in enforcing mode. 1457 */ 1458static int tomoyo_poll_query(struct file *file, poll_table *wait) 1459{ 1460 struct list_head *tmp; 1461 bool found = false; 1462 u8 i; 1463 for (i = 0; i < 2; i++) { 1464 spin_lock(&tomoyo_query_list_lock); 1465 list_for_each(tmp, &tomoyo_query_list) { 1466 struct tomoyo_query_entry *ptr 1467 = list_entry(tmp, struct tomoyo_query_entry, 1468 list); 1469 if (ptr->answer) 1470 continue; 1471 found = true; 1472 break; 1473 } 1474 spin_unlock(&tomoyo_query_list_lock); 1475 if (found) 1476 return POLLIN | POLLRDNORM; 1477 if (i) 1478 break; 1479 poll_wait(file, &tomoyo_query_wait, wait); 1480 } 1481 return 0; 1482} 1483 1484/** 1485 * tomoyo_read_query - Read access requests which violated policy in enforcing mode. 1486 * 1487 * @head: Pointer to "struct tomoyo_io_buffer". 1488 * 1489 * Returns 0. 1490 */ 1491static int tomoyo_read_query(struct tomoyo_io_buffer *head) 1492{ 1493 struct list_head *tmp; 1494 int pos = 0; 1495 int len = 0; 1496 char *buf; 1497 if (head->read_avail) 1498 return 0; 1499 if (head->read_buf) { 1500 kfree(head->read_buf); 1501 head->read_buf = NULL; 1502 head->readbuf_size = 0; 1503 } 1504 spin_lock(&tomoyo_query_list_lock); 1505 list_for_each(tmp, &tomoyo_query_list) { 1506 struct tomoyo_query_entry *ptr 1507 = list_entry(tmp, struct tomoyo_query_entry, list); 1508 if (ptr->answer) 1509 continue; 1510 if (pos++ != head->read_step) 1511 continue; 1512 len = ptr->query_len; 1513 break; 1514 } 1515 spin_unlock(&tomoyo_query_list_lock); 1516 if (!len) { 1517 head->read_step = 0; 1518 return 0; 1519 } 1520 buf = kzalloc(len, GFP_NOFS); 1521 if (!buf) 1522 return 0; 1523 pos = 0; 1524 spin_lock(&tomoyo_query_list_lock); 1525 list_for_each(tmp, &tomoyo_query_list) { 1526 struct tomoyo_query_entry *ptr 1527 = list_entry(tmp, struct tomoyo_query_entry, list); 1528 if (ptr->answer) 1529 continue; 1530 if (pos++ != head->read_step) 1531 continue; 1532 /* 1533 * Some query can be skipped because tomoyo_query_list 1534 * can change, but I don't care. 1535 */ 1536 if (len == ptr->query_len) 1537 memmove(buf, ptr->query, len); 1538 break; 1539 } 1540 spin_unlock(&tomoyo_query_list_lock); 1541 if (buf[0]) { 1542 head->read_avail = len; 1543 head->readbuf_size = head->read_avail; 1544 head->read_buf = buf; 1545 head->read_step++; 1546 } else { 1547 kfree(buf); 1548 } 1549 return 0; 1550} 1551 1552/** 1553 * tomoyo_write_answer - Write the supervisor's decision. 1554 * 1555 * @head: Pointer to "struct tomoyo_io_buffer". 1556 * 1557 * Returns 0 on success, -EINVAL otherwise. 1558 */ 1559static int tomoyo_write_answer(struct tomoyo_io_buffer *head) 1560{ 1561 char *data = head->write_buf; 1562 struct list_head *tmp; 1563 unsigned int serial; 1564 unsigned int answer; 1565 spin_lock(&tomoyo_query_list_lock); 1566 list_for_each(tmp, &tomoyo_query_list) { 1567 struct tomoyo_query_entry *ptr 1568 = list_entry(tmp, struct tomoyo_query_entry, list); 1569 ptr->timer = 0; 1570 } 1571 spin_unlock(&tomoyo_query_list_lock); 1572 if (sscanf(data, "A%u=%u", &serial, &answer) != 2) 1573 return -EINVAL; 1574 spin_lock(&tomoyo_query_list_lock); 1575 list_for_each(tmp, &tomoyo_query_list) { 1576 struct tomoyo_query_entry *ptr 1577 = list_entry(tmp, struct tomoyo_query_entry, list); 1578 if (ptr->serial != serial) 1579 continue; 1580 if (!ptr->answer) 1581 ptr->answer = answer; 1582 break; 1583 } 1584 spin_unlock(&tomoyo_query_list_lock); 1585 return 0; 1586} 1587 1588/** 1589 * tomoyo_read_version: Get version. 1590 * 1591 * @head: Pointer to "struct tomoyo_io_buffer". 1592 * 1593 * Returns version information. 1594 */ 1595static int tomoyo_read_version(struct tomoyo_io_buffer *head) 1596{ 1597 if (!head->read_eof) { 1598 tomoyo_io_printf(head, "2.2.0"); 1599 head->read_eof = true; 1600 } 1601 return 0; 1602} 1603 1604/** 1605 * tomoyo_read_self_domain - Get the current process's domainname. 1606 * 1607 * @head: Pointer to "struct tomoyo_io_buffer". 1608 * 1609 * Returns the current process's domainname. 1610 */ 1611static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head) 1612{ 1613 if (!head->read_eof) { 1614 /* 1615 * tomoyo_domain()->domainname != NULL 1616 * because every process belongs to a domain and 1617 * the domain's name cannot be NULL. 1618 */ 1619 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name); 1620 head->read_eof = true; 1621 } 1622 return 0; 1623} 1624 1625/** 1626 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. 1627 * 1628 * @type: Type of interface. 1629 * @file: Pointer to "struct file". 1630 * 1631 * Associates policy handler and returns 0 on success, -ENOMEM otherwise. 1632 * 1633 * Caller acquires tomoyo_read_lock(). 1634 */ 1635int tomoyo_open_control(const u8 type, struct file *file) 1636{ 1637 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS); 1638 1639 if (!head) 1640 return -ENOMEM; 1641 mutex_init(&head->io_sem); 1642 head->type = type; 1643 switch (type) { 1644 case TOMOYO_DOMAINPOLICY: 1645 /* /sys/kernel/security/tomoyo/domain_policy */ 1646 head->write = tomoyo_write_domain_policy; 1647 head->read = tomoyo_read_domain_policy; 1648 break; 1649 case TOMOYO_EXCEPTIONPOLICY: 1650 /* /sys/kernel/security/tomoyo/exception_policy */ 1651 head->write = tomoyo_write_exception_policy; 1652 head->read = tomoyo_read_exception_policy; 1653 break; 1654 case TOMOYO_SELFDOMAIN: 1655 /* /sys/kernel/security/tomoyo/self_domain */ 1656 head->read = tomoyo_read_self_domain; 1657 break; 1658 case TOMOYO_DOMAIN_STATUS: 1659 /* /sys/kernel/security/tomoyo/.domain_status */ 1660 head->write = tomoyo_write_domain_profile; 1661 head->read = tomoyo_read_domain_profile; 1662 break; 1663 case TOMOYO_PROCESS_STATUS: 1664 /* /sys/kernel/security/tomoyo/.process_status */ 1665 head->write = tomoyo_write_pid; 1666 head->read = tomoyo_read_pid; 1667 break; 1668 case TOMOYO_VERSION: 1669 /* /sys/kernel/security/tomoyo/version */ 1670 head->read = tomoyo_read_version; 1671 head->readbuf_size = 128; 1672 break; 1673 case TOMOYO_MEMINFO: 1674 /* /sys/kernel/security/tomoyo/meminfo */ 1675 head->write = tomoyo_write_memory_quota; 1676 head->read = tomoyo_read_memory_counter; 1677 head->readbuf_size = 512; 1678 break; 1679 case TOMOYO_PROFILE: 1680 /* /sys/kernel/security/tomoyo/profile */ 1681 head->write = tomoyo_write_profile; 1682 head->read = tomoyo_read_profile; 1683 break; 1684 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */ 1685 head->poll = tomoyo_poll_query; 1686 head->write = tomoyo_write_answer; 1687 head->read = tomoyo_read_query; 1688 break; 1689 case TOMOYO_MANAGER: 1690 /* /sys/kernel/security/tomoyo/manager */ 1691 head->write = tomoyo_write_manager_policy; 1692 head->read = tomoyo_read_manager_policy; 1693 break; 1694 } 1695 if (!(file->f_mode & FMODE_READ)) { 1696 /* 1697 * No need to allocate read_buf since it is not opened 1698 * for reading. 1699 */ 1700 head->read = NULL; 1701 head->poll = NULL; 1702 } else if (!head->poll) { 1703 /* Don't allocate read_buf for poll() access. */ 1704 if (!head->readbuf_size) 1705 head->readbuf_size = 4096 * 2; 1706 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS); 1707 if (!head->read_buf) { 1708 kfree(head); 1709 return -ENOMEM; 1710 } 1711 } 1712 if (!(file->f_mode & FMODE_WRITE)) { 1713 /* 1714 * No need to allocate write_buf since it is not opened 1715 * for writing. 1716 */ 1717 head->write = NULL; 1718 } else if (head->write) { 1719 head->writebuf_size = 4096 * 2; 1720 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS); 1721 if (!head->write_buf) { 1722 kfree(head->read_buf); 1723 kfree(head); 1724 return -ENOMEM; 1725 } 1726 } 1727 if (type != TOMOYO_QUERY) 1728 head->reader_idx = tomoyo_read_lock(); 1729 file->private_data = head; 1730 /* 1731 * Call the handler now if the file is 1732 * /sys/kernel/security/tomoyo/self_domain 1733 * so that the user can use 1734 * cat < /sys/kernel/security/tomoyo/self_domain" 1735 * to know the current process's domainname. 1736 */ 1737 if (type == TOMOYO_SELFDOMAIN) 1738 tomoyo_read_control(file, NULL, 0); 1739 /* 1740 * If the file is /sys/kernel/security/tomoyo/query , increment the 1741 * observer counter. 1742 * The obserber counter is used by tomoyo_supervisor() to see if 1743 * there is some process monitoring /sys/kernel/security/tomoyo/query. 1744 */ 1745 else if (type == TOMOYO_QUERY) 1746 atomic_inc(&tomoyo_query_observers); 1747 return 0; 1748} 1749 1750/** 1751 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface. 1752 * 1753 * @file: Pointer to "struct file". 1754 * @wait: Pointer to "poll_table". 1755 * 1756 * Waits for read readiness. 1757 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd . 1758 */ 1759int tomoyo_poll_control(struct file *file, poll_table *wait) 1760{ 1761 struct tomoyo_io_buffer *head = file->private_data; 1762 if (!head->poll) 1763 return -ENOSYS; 1764 return head->poll(file, wait); 1765} 1766 1767/** 1768 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. 1769 * 1770 * @file: Pointer to "struct file". 1771 * @buffer: Poiner to buffer to write to. 1772 * @buffer_len: Size of @buffer. 1773 * 1774 * Returns bytes read on success, negative value otherwise. 1775 * 1776 * Caller holds tomoyo_read_lock(). 1777 */ 1778int tomoyo_read_control(struct file *file, char __user *buffer, 1779 const int buffer_len) 1780{ 1781 int len = 0; 1782 struct tomoyo_io_buffer *head = file->private_data; 1783 char *cp; 1784 1785 if (!head->read) 1786 return -ENOSYS; 1787 if (mutex_lock_interruptible(&head->io_sem)) 1788 return -EINTR; 1789 /* Call the policy handler. */ 1790 len = head->read(head); 1791 if (len < 0) 1792 goto out; 1793 /* Write to buffer. */ 1794 len = head->read_avail; 1795 if (len > buffer_len) 1796 len = buffer_len; 1797 if (!len) 1798 goto out; 1799 /* head->read_buf changes by some functions. */ 1800 cp = head->read_buf; 1801 if (copy_to_user(buffer, cp, len)) { 1802 len = -EFAULT; 1803 goto out; 1804 } 1805 head->read_avail -= len; 1806 memmove(cp, cp + len, head->read_avail); 1807 out: 1808 mutex_unlock(&head->io_sem); 1809 return len; 1810} 1811 1812/** 1813 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. 1814 * 1815 * @file: Pointer to "struct file". 1816 * @buffer: Pointer to buffer to read from. 1817 * @buffer_len: Size of @buffer. 1818 * 1819 * Returns @buffer_len on success, negative value otherwise. 1820 * 1821 * Caller holds tomoyo_read_lock(). 1822 */ 1823int tomoyo_write_control(struct file *file, const char __user *buffer, 1824 const int buffer_len) 1825{ 1826 struct tomoyo_io_buffer *head = file->private_data; 1827 int error = buffer_len; 1828 int avail_len = buffer_len; 1829 char *cp0 = head->write_buf; 1830 1831 if (!head->write) 1832 return -ENOSYS; 1833 if (!access_ok(VERIFY_READ, buffer, buffer_len)) 1834 return -EFAULT; 1835 /* Don't allow updating policies by non manager programs. */ 1836 if (head->write != tomoyo_write_pid && 1837 head->write != tomoyo_write_domain_policy && 1838 !tomoyo_is_policy_manager()) 1839 return -EPERM; 1840 if (mutex_lock_interruptible(&head->io_sem)) 1841 return -EINTR; 1842 /* Read a line and dispatch it to the policy handler. */ 1843 while (avail_len > 0) { 1844 char c; 1845 if (head->write_avail >= head->writebuf_size - 1) { 1846 error = -ENOMEM; 1847 break; 1848 } else if (get_user(c, buffer)) { 1849 error = -EFAULT; 1850 break; 1851 } 1852 buffer++; 1853 avail_len--; 1854 cp0[head->write_avail++] = c; 1855 if (c != '\n') 1856 continue; 1857 cp0[head->write_avail - 1] = '\0'; 1858 head->write_avail = 0; 1859 tomoyo_normalize_line(cp0); 1860 head->write(head); 1861 } 1862 mutex_unlock(&head->io_sem); 1863 return error; 1864} 1865 1866/** 1867 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. 1868 * 1869 * @file: Pointer to "struct file". 1870 * 1871 * Releases memory and returns 0. 1872 * 1873 * Caller looses tomoyo_read_lock(). 1874 */ 1875int tomoyo_close_control(struct file *file) 1876{ 1877 struct tomoyo_io_buffer *head = file->private_data; 1878 const bool is_write = !!head->write_buf; 1879 1880 /* 1881 * If the file is /sys/kernel/security/tomoyo/query , decrement the 1882 * observer counter. 1883 */ 1884 if (head->type == TOMOYO_QUERY) 1885 atomic_dec(&tomoyo_query_observers); 1886 else 1887 tomoyo_read_unlock(head->reader_idx); 1888 /* Release memory used for policy I/O. */ 1889 kfree(head->read_buf); 1890 head->read_buf = NULL; 1891 kfree(head->write_buf); 1892 head->write_buf = NULL; 1893 kfree(head); 1894 head = NULL; 1895 file->private_data = NULL; 1896 if (is_write) 1897 tomoyo_run_gc(); 1898 return 0; 1899} 1900 1901/** 1902 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined. 1903 */ 1904void tomoyo_check_profile(void) 1905{ 1906 struct tomoyo_domain_info *domain; 1907 const int idx = tomoyo_read_lock(); 1908 tomoyo_policy_loaded = true; 1909 /* Check all profiles currently assigned to domains are defined. */ 1910 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 1911 const u8 profile = domain->profile; 1912 if (tomoyo_profile_ptr[profile]) 1913 continue; 1914 panic("Profile %u (used by '%s') not defined.\n", 1915 profile, domain->domainname->name); 1916 } 1917 tomoyo_read_unlock(idx); 1918 printk(KERN_INFO "TOMOYO: 2.2.0 2009/04/01\n"); 1919 printk(KERN_INFO "Mandatory Access Control activated.\n"); 1920} 1921