common.c revision e2b8b25a6795488eba7bb757706b3ac725c31fac
1/* 2 * security/tomoyo/common.c 3 * 4 * Copyright (C) 2005-2011 NTT DATA CORPORATION 5 */ 6 7#include <linux/uaccess.h> 8#include <linux/slab.h> 9#include <linux/security.h> 10#include "common.h" 11 12/* String table for operation mode. */ 13const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = { 14 [TOMOYO_CONFIG_DISABLED] = "disabled", 15 [TOMOYO_CONFIG_LEARNING] = "learning", 16 [TOMOYO_CONFIG_PERMISSIVE] = "permissive", 17 [TOMOYO_CONFIG_ENFORCING] = "enforcing" 18}; 19 20/* String table for /sys/kernel/security/tomoyo/profile */ 21const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX 22 + TOMOYO_MAX_MAC_CATEGORY_INDEX] = { 23 /* CONFIG::file group */ 24 [TOMOYO_MAC_FILE_EXECUTE] = "execute", 25 [TOMOYO_MAC_FILE_OPEN] = "open", 26 [TOMOYO_MAC_FILE_CREATE] = "create", 27 [TOMOYO_MAC_FILE_UNLINK] = "unlink", 28 [TOMOYO_MAC_FILE_GETATTR] = "getattr", 29 [TOMOYO_MAC_FILE_MKDIR] = "mkdir", 30 [TOMOYO_MAC_FILE_RMDIR] = "rmdir", 31 [TOMOYO_MAC_FILE_MKFIFO] = "mkfifo", 32 [TOMOYO_MAC_FILE_MKSOCK] = "mksock", 33 [TOMOYO_MAC_FILE_TRUNCATE] = "truncate", 34 [TOMOYO_MAC_FILE_SYMLINK] = "symlink", 35 [TOMOYO_MAC_FILE_MKBLOCK] = "mkblock", 36 [TOMOYO_MAC_FILE_MKCHAR] = "mkchar", 37 [TOMOYO_MAC_FILE_LINK] = "link", 38 [TOMOYO_MAC_FILE_RENAME] = "rename", 39 [TOMOYO_MAC_FILE_CHMOD] = "chmod", 40 [TOMOYO_MAC_FILE_CHOWN] = "chown", 41 [TOMOYO_MAC_FILE_CHGRP] = "chgrp", 42 [TOMOYO_MAC_FILE_IOCTL] = "ioctl", 43 [TOMOYO_MAC_FILE_CHROOT] = "chroot", 44 [TOMOYO_MAC_FILE_MOUNT] = "mount", 45 [TOMOYO_MAC_FILE_UMOUNT] = "unmount", 46 [TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root", 47 /* CONFIG::network group */ 48 [TOMOYO_MAC_NETWORK_INET_STREAM_BIND] = "inet_stream_bind", 49 [TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN] = "inet_stream_listen", 50 [TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT] = "inet_stream_connect", 51 [TOMOYO_MAC_NETWORK_INET_DGRAM_BIND] = "inet_dgram_bind", 52 [TOMOYO_MAC_NETWORK_INET_DGRAM_SEND] = "inet_dgram_send", 53 [TOMOYO_MAC_NETWORK_INET_RAW_BIND] = "inet_raw_bind", 54 [TOMOYO_MAC_NETWORK_INET_RAW_SEND] = "inet_raw_send", 55 [TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND] = "unix_stream_bind", 56 [TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN] = "unix_stream_listen", 57 [TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT] = "unix_stream_connect", 58 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND] = "unix_dgram_bind", 59 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND] = "unix_dgram_send", 60 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND] = "unix_seqpacket_bind", 61 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN] = "unix_seqpacket_listen", 62 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = "unix_seqpacket_connect", 63 /* CONFIG::misc group */ 64 [TOMOYO_MAC_ENVIRON] = "env", 65 /* CONFIG group */ 66 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file", 67 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_NETWORK] = "network", 68 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_MISC] = "misc", 69}; 70 71/* String table for conditions. */ 72const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = { 73 [TOMOYO_TASK_UID] = "task.uid", 74 [TOMOYO_TASK_EUID] = "task.euid", 75 [TOMOYO_TASK_SUID] = "task.suid", 76 [TOMOYO_TASK_FSUID] = "task.fsuid", 77 [TOMOYO_TASK_GID] = "task.gid", 78 [TOMOYO_TASK_EGID] = "task.egid", 79 [TOMOYO_TASK_SGID] = "task.sgid", 80 [TOMOYO_TASK_FSGID] = "task.fsgid", 81 [TOMOYO_TASK_PID] = "task.pid", 82 [TOMOYO_TASK_PPID] = "task.ppid", 83 [TOMOYO_EXEC_ARGC] = "exec.argc", 84 [TOMOYO_EXEC_ENVC] = "exec.envc", 85 [TOMOYO_TYPE_IS_SOCKET] = "socket", 86 [TOMOYO_TYPE_IS_SYMLINK] = "symlink", 87 [TOMOYO_TYPE_IS_FILE] = "file", 88 [TOMOYO_TYPE_IS_BLOCK_DEV] = "block", 89 [TOMOYO_TYPE_IS_DIRECTORY] = "directory", 90 [TOMOYO_TYPE_IS_CHAR_DEV] = "char", 91 [TOMOYO_TYPE_IS_FIFO] = "fifo", 92 [TOMOYO_MODE_SETUID] = "setuid", 93 [TOMOYO_MODE_SETGID] = "setgid", 94 [TOMOYO_MODE_STICKY] = "sticky", 95 [TOMOYO_MODE_OWNER_READ] = "owner_read", 96 [TOMOYO_MODE_OWNER_WRITE] = "owner_write", 97 [TOMOYO_MODE_OWNER_EXECUTE] = "owner_execute", 98 [TOMOYO_MODE_GROUP_READ] = "group_read", 99 [TOMOYO_MODE_GROUP_WRITE] = "group_write", 100 [TOMOYO_MODE_GROUP_EXECUTE] = "group_execute", 101 [TOMOYO_MODE_OTHERS_READ] = "others_read", 102 [TOMOYO_MODE_OTHERS_WRITE] = "others_write", 103 [TOMOYO_MODE_OTHERS_EXECUTE] = "others_execute", 104 [TOMOYO_EXEC_REALPATH] = "exec.realpath", 105 [TOMOYO_SYMLINK_TARGET] = "symlink.target", 106 [TOMOYO_PATH1_UID] = "path1.uid", 107 [TOMOYO_PATH1_GID] = "path1.gid", 108 [TOMOYO_PATH1_INO] = "path1.ino", 109 [TOMOYO_PATH1_MAJOR] = "path1.major", 110 [TOMOYO_PATH1_MINOR] = "path1.minor", 111 [TOMOYO_PATH1_PERM] = "path1.perm", 112 [TOMOYO_PATH1_TYPE] = "path1.type", 113 [TOMOYO_PATH1_DEV_MAJOR] = "path1.dev_major", 114 [TOMOYO_PATH1_DEV_MINOR] = "path1.dev_minor", 115 [TOMOYO_PATH2_UID] = "path2.uid", 116 [TOMOYO_PATH2_GID] = "path2.gid", 117 [TOMOYO_PATH2_INO] = "path2.ino", 118 [TOMOYO_PATH2_MAJOR] = "path2.major", 119 [TOMOYO_PATH2_MINOR] = "path2.minor", 120 [TOMOYO_PATH2_PERM] = "path2.perm", 121 [TOMOYO_PATH2_TYPE] = "path2.type", 122 [TOMOYO_PATH2_DEV_MAJOR] = "path2.dev_major", 123 [TOMOYO_PATH2_DEV_MINOR] = "path2.dev_minor", 124 [TOMOYO_PATH1_PARENT_UID] = "path1.parent.uid", 125 [TOMOYO_PATH1_PARENT_GID] = "path1.parent.gid", 126 [TOMOYO_PATH1_PARENT_INO] = "path1.parent.ino", 127 [TOMOYO_PATH1_PARENT_PERM] = "path1.parent.perm", 128 [TOMOYO_PATH2_PARENT_UID] = "path2.parent.uid", 129 [TOMOYO_PATH2_PARENT_GID] = "path2.parent.gid", 130 [TOMOYO_PATH2_PARENT_INO] = "path2.parent.ino", 131 [TOMOYO_PATH2_PARENT_PERM] = "path2.parent.perm", 132}; 133 134/* String table for PREFERENCE keyword. */ 135static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = { 136 [TOMOYO_PREF_MAX_AUDIT_LOG] = "max_audit_log", 137 [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry", 138}; 139 140/* String table for path operation. */ 141const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = { 142 [TOMOYO_TYPE_EXECUTE] = "execute", 143 [TOMOYO_TYPE_READ] = "read", 144 [TOMOYO_TYPE_WRITE] = "write", 145 [TOMOYO_TYPE_APPEND] = "append", 146 [TOMOYO_TYPE_UNLINK] = "unlink", 147 [TOMOYO_TYPE_GETATTR] = "getattr", 148 [TOMOYO_TYPE_RMDIR] = "rmdir", 149 [TOMOYO_TYPE_TRUNCATE] = "truncate", 150 [TOMOYO_TYPE_SYMLINK] = "symlink", 151 [TOMOYO_TYPE_CHROOT] = "chroot", 152 [TOMOYO_TYPE_UMOUNT] = "unmount", 153}; 154 155/* String table for socket's operation. */ 156const char * const tomoyo_socket_keyword[TOMOYO_MAX_NETWORK_OPERATION] = { 157 [TOMOYO_NETWORK_BIND] = "bind", 158 [TOMOYO_NETWORK_LISTEN] = "listen", 159 [TOMOYO_NETWORK_CONNECT] = "connect", 160 [TOMOYO_NETWORK_SEND] = "send", 161}; 162 163/* String table for categories. */ 164static const char * const tomoyo_category_keywords 165[TOMOYO_MAX_MAC_CATEGORY_INDEX] = { 166 [TOMOYO_MAC_CATEGORY_FILE] = "file", 167 [TOMOYO_MAC_CATEGORY_NETWORK] = "network", 168 [TOMOYO_MAC_CATEGORY_MISC] = "misc", 169}; 170 171/* Permit policy management by non-root user? */ 172static bool tomoyo_manage_by_non_root; 173 174/* Utility functions. */ 175 176/** 177 * tomoyo_yesno - Return "yes" or "no". 178 * 179 * @value: Bool value. 180 */ 181const char *tomoyo_yesno(const unsigned int value) 182{ 183 return value ? "yes" : "no"; 184} 185 186/** 187 * tomoyo_addprintf - strncat()-like-snprintf(). 188 * 189 * @buffer: Buffer to write to. Must be '\0'-terminated. 190 * @len: Size of @buffer. 191 * @fmt: The printf()'s format string, followed by parameters. 192 * 193 * Returns nothing. 194 */ 195static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...) 196{ 197 va_list args; 198 const int pos = strlen(buffer); 199 va_start(args, fmt); 200 vsnprintf(buffer + pos, len - pos - 1, fmt, args); 201 va_end(args); 202} 203 204/** 205 * tomoyo_flush - Flush queued string to userspace's buffer. 206 * 207 * @head: Pointer to "struct tomoyo_io_buffer". 208 * 209 * Returns true if all data was flushed, false otherwise. 210 */ 211static bool tomoyo_flush(struct tomoyo_io_buffer *head) 212{ 213 while (head->r.w_pos) { 214 const char *w = head->r.w[0]; 215 size_t len = strlen(w); 216 if (len) { 217 if (len > head->read_user_buf_avail) 218 len = head->read_user_buf_avail; 219 if (!len) 220 return false; 221 if (copy_to_user(head->read_user_buf, w, len)) 222 return false; 223 head->read_user_buf_avail -= len; 224 head->read_user_buf += len; 225 w += len; 226 } 227 head->r.w[0] = w; 228 if (*w) 229 return false; 230 /* Add '\0' for audit logs and query. */ 231 if (head->poll) { 232 if (!head->read_user_buf_avail || 233 copy_to_user(head->read_user_buf, "", 1)) 234 return false; 235 head->read_user_buf_avail--; 236 head->read_user_buf++; 237 } 238 head->r.w_pos--; 239 for (len = 0; len < head->r.w_pos; len++) 240 head->r.w[len] = head->r.w[len + 1]; 241 } 242 head->r.avail = 0; 243 return true; 244} 245 246/** 247 * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure. 248 * 249 * @head: Pointer to "struct tomoyo_io_buffer". 250 * @string: String to print. 251 * 252 * Note that @string has to be kept valid until @head is kfree()d. 253 * This means that char[] allocated on stack memory cannot be passed to 254 * this function. Use tomoyo_io_printf() for char[] allocated on stack memory. 255 */ 256static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string) 257{ 258 if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) { 259 head->r.w[head->r.w_pos++] = string; 260 tomoyo_flush(head); 261 } else 262 WARN_ON(1); 263} 264 265static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, 266 ...) __printf(2, 3); 267 268/** 269 * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure. 270 * 271 * @head: Pointer to "struct tomoyo_io_buffer". 272 * @fmt: The printf()'s format string, followed by parameters. 273 */ 274static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, 275 ...) 276{ 277 va_list args; 278 size_t len; 279 size_t pos = head->r.avail; 280 int size = head->readbuf_size - pos; 281 if (size <= 0) 282 return; 283 va_start(args, fmt); 284 len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1; 285 va_end(args); 286 if (pos + len >= head->readbuf_size) { 287 WARN_ON(1); 288 return; 289 } 290 head->r.avail += len; 291 tomoyo_set_string(head, head->read_buf + pos); 292} 293 294/** 295 * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure. 296 * 297 * @head: Pointer to "struct tomoyo_io_buffer". 298 * 299 * Returns nothing. 300 */ 301static void tomoyo_set_space(struct tomoyo_io_buffer *head) 302{ 303 tomoyo_set_string(head, " "); 304} 305 306/** 307 * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure. 308 * 309 * @head: Pointer to "struct tomoyo_io_buffer". 310 * 311 * Returns nothing. 312 */ 313static bool tomoyo_set_lf(struct tomoyo_io_buffer *head) 314{ 315 tomoyo_set_string(head, "\n"); 316 return !head->r.w_pos; 317} 318 319/** 320 * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure. 321 * 322 * @head: Pointer to "struct tomoyo_io_buffer". 323 * 324 * Returns nothing. 325 */ 326static void tomoyo_set_slash(struct tomoyo_io_buffer *head) 327{ 328 tomoyo_set_string(head, "/"); 329} 330 331/* List of namespaces. */ 332LIST_HEAD(tomoyo_namespace_list); 333/* True if namespace other than tomoyo_kernel_namespace is defined. */ 334static bool tomoyo_namespace_enabled; 335 336/** 337 * tomoyo_init_policy_namespace - Initialize namespace. 338 * 339 * @ns: Pointer to "struct tomoyo_policy_namespace". 340 * 341 * Returns nothing. 342 */ 343void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns) 344{ 345 unsigned int idx; 346 for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++) 347 INIT_LIST_HEAD(&ns->acl_group[idx]); 348 for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++) 349 INIT_LIST_HEAD(&ns->group_list[idx]); 350 for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++) 351 INIT_LIST_HEAD(&ns->policy_list[idx]); 352 ns->profile_version = 20110903; 353 tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list); 354 list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list); 355} 356 357/** 358 * tomoyo_print_namespace - Print namespace header. 359 * 360 * @head: Pointer to "struct tomoyo_io_buffer". 361 * 362 * Returns nothing. 363 */ 364static void tomoyo_print_namespace(struct tomoyo_io_buffer *head) 365{ 366 if (!tomoyo_namespace_enabled) 367 return; 368 tomoyo_set_string(head, 369 container_of(head->r.ns, 370 struct tomoyo_policy_namespace, 371 namespace_list)->name); 372 tomoyo_set_space(head); 373} 374 375/** 376 * tomoyo_print_name_union - Print a tomoyo_name_union. 377 * 378 * @head: Pointer to "struct tomoyo_io_buffer". 379 * @ptr: Pointer to "struct tomoyo_name_union". 380 */ 381static void tomoyo_print_name_union(struct tomoyo_io_buffer *head, 382 const struct tomoyo_name_union *ptr) 383{ 384 tomoyo_set_space(head); 385 if (ptr->group) { 386 tomoyo_set_string(head, "@"); 387 tomoyo_set_string(head, ptr->group->group_name->name); 388 } else { 389 tomoyo_set_string(head, ptr->filename->name); 390 } 391} 392 393/** 394 * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote. 395 * 396 * @head: Pointer to "struct tomoyo_io_buffer". 397 * @ptr: Pointer to "struct tomoyo_name_union". 398 * 399 * Returns nothing. 400 */ 401static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head, 402 const struct tomoyo_name_union *ptr) 403{ 404 if (ptr->group) { 405 tomoyo_set_string(head, "@"); 406 tomoyo_set_string(head, ptr->group->group_name->name); 407 } else { 408 tomoyo_set_string(head, "\""); 409 tomoyo_set_string(head, ptr->filename->name); 410 tomoyo_set_string(head, "\""); 411 } 412} 413 414/** 415 * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space. 416 * 417 * @head: Pointer to "struct tomoyo_io_buffer". 418 * @ptr: Pointer to "struct tomoyo_number_union". 419 * 420 * Returns nothing. 421 */ 422static void tomoyo_print_number_union_nospace 423(struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr) 424{ 425 if (ptr->group) { 426 tomoyo_set_string(head, "@"); 427 tomoyo_set_string(head, ptr->group->group_name->name); 428 } else { 429 int i; 430 unsigned long min = ptr->values[0]; 431 const unsigned long max = ptr->values[1]; 432 u8 min_type = ptr->value_type[0]; 433 const u8 max_type = ptr->value_type[1]; 434 char buffer[128]; 435 buffer[0] = '\0'; 436 for (i = 0; i < 2; i++) { 437 switch (min_type) { 438 case TOMOYO_VALUE_TYPE_HEXADECIMAL: 439 tomoyo_addprintf(buffer, sizeof(buffer), 440 "0x%lX", min); 441 break; 442 case TOMOYO_VALUE_TYPE_OCTAL: 443 tomoyo_addprintf(buffer, sizeof(buffer), 444 "0%lo", min); 445 break; 446 default: 447 tomoyo_addprintf(buffer, sizeof(buffer), "%lu", 448 min); 449 break; 450 } 451 if (min == max && min_type == max_type) 452 break; 453 tomoyo_addprintf(buffer, sizeof(buffer), "-"); 454 min_type = max_type; 455 min = max; 456 } 457 tomoyo_io_printf(head, "%s", buffer); 458 } 459} 460 461/** 462 * tomoyo_print_number_union - Print a tomoyo_number_union. 463 * 464 * @head: Pointer to "struct tomoyo_io_buffer". 465 * @ptr: Pointer to "struct tomoyo_number_union". 466 * 467 * Returns nothing. 468 */ 469static void tomoyo_print_number_union(struct tomoyo_io_buffer *head, 470 const struct tomoyo_number_union *ptr) 471{ 472 tomoyo_set_space(head); 473 tomoyo_print_number_union_nospace(head, ptr); 474} 475 476/** 477 * tomoyo_assign_profile - Create a new profile. 478 * 479 * @ns: Pointer to "struct tomoyo_policy_namespace". 480 * @profile: Profile number to create. 481 * 482 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise. 483 */ 484static struct tomoyo_profile *tomoyo_assign_profile 485(struct tomoyo_policy_namespace *ns, const unsigned int profile) 486{ 487 struct tomoyo_profile *ptr; 488 struct tomoyo_profile *entry; 489 if (profile >= TOMOYO_MAX_PROFILES) 490 return NULL; 491 ptr = ns->profile_ptr[profile]; 492 if (ptr) 493 return ptr; 494 entry = kzalloc(sizeof(*entry), GFP_NOFS); 495 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 496 goto out; 497 ptr = ns->profile_ptr[profile]; 498 if (!ptr && tomoyo_memory_ok(entry)) { 499 ptr = entry; 500 ptr->default_config = TOMOYO_CONFIG_DISABLED | 501 TOMOYO_CONFIG_WANT_GRANT_LOG | 502 TOMOYO_CONFIG_WANT_REJECT_LOG; 503 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT, 504 sizeof(ptr->config)); 505 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] = 1024; 506 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] = 2048; 507 mb(); /* Avoid out-of-order execution. */ 508 ns->profile_ptr[profile] = ptr; 509 entry = NULL; 510 } 511 mutex_unlock(&tomoyo_policy_lock); 512 out: 513 kfree(entry); 514 return ptr; 515} 516 517/** 518 * tomoyo_profile - Find a profile. 519 * 520 * @ns: Pointer to "struct tomoyo_policy_namespace". 521 * @profile: Profile number to find. 522 * 523 * Returns pointer to "struct tomoyo_profile". 524 */ 525struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns, 526 const u8 profile) 527{ 528 static struct tomoyo_profile tomoyo_null_profile; 529 struct tomoyo_profile *ptr = ns->profile_ptr[profile]; 530 if (!ptr) 531 ptr = &tomoyo_null_profile; 532 return ptr; 533} 534 535/** 536 * tomoyo_find_yesno - Find values for specified keyword. 537 * 538 * @string: String to check. 539 * @find: Name of keyword. 540 * 541 * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise. 542 */ 543static s8 tomoyo_find_yesno(const char *string, const char *find) 544{ 545 const char *cp = strstr(string, find); 546 if (cp) { 547 cp += strlen(find); 548 if (!strncmp(cp, "=yes", 4)) 549 return 1; 550 else if (!strncmp(cp, "=no", 3)) 551 return 0; 552 } 553 return -1; 554} 555 556/** 557 * tomoyo_set_uint - Set value for specified preference. 558 * 559 * @i: Pointer to "unsigned int". 560 * @string: String to check. 561 * @find: Name of keyword. 562 * 563 * Returns nothing. 564 */ 565static void tomoyo_set_uint(unsigned int *i, const char *string, 566 const char *find) 567{ 568 const char *cp = strstr(string, find); 569 if (cp) 570 sscanf(cp + strlen(find), "=%u", i); 571} 572 573/** 574 * tomoyo_set_mode - Set mode for specified profile. 575 * 576 * @name: Name of functionality. 577 * @value: Mode for @name. 578 * @profile: Pointer to "struct tomoyo_profile". 579 * 580 * Returns 0 on success, negative value otherwise. 581 */ 582static int tomoyo_set_mode(char *name, const char *value, 583 struct tomoyo_profile *profile) 584{ 585 u8 i; 586 u8 config; 587 if (!strcmp(name, "CONFIG")) { 588 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX; 589 config = profile->default_config; 590 } else if (tomoyo_str_starts(&name, "CONFIG::")) { 591 config = 0; 592 for (i = 0; i < TOMOYO_MAX_MAC_INDEX 593 + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) { 594 int len = 0; 595 if (i < TOMOYO_MAX_MAC_INDEX) { 596 const u8 c = tomoyo_index2category[i]; 597 const char *category = 598 tomoyo_category_keywords[c]; 599 len = strlen(category); 600 if (strncmp(name, category, len) || 601 name[len++] != ':' || name[len++] != ':') 602 continue; 603 } 604 if (strcmp(name + len, tomoyo_mac_keywords[i])) 605 continue; 606 config = profile->config[i]; 607 break; 608 } 609 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX) 610 return -EINVAL; 611 } else { 612 return -EINVAL; 613 } 614 if (strstr(value, "use_default")) { 615 config = TOMOYO_CONFIG_USE_DEFAULT; 616 } else { 617 u8 mode; 618 for (mode = 0; mode < 4; mode++) 619 if (strstr(value, tomoyo_mode[mode])) 620 /* 621 * Update lower 3 bits in order to distinguish 622 * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'. 623 */ 624 config = (config & ~7) | mode; 625 if (config != TOMOYO_CONFIG_USE_DEFAULT) { 626 switch (tomoyo_find_yesno(value, "grant_log")) { 627 case 1: 628 config |= TOMOYO_CONFIG_WANT_GRANT_LOG; 629 break; 630 case 0: 631 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG; 632 break; 633 } 634 switch (tomoyo_find_yesno(value, "reject_log")) { 635 case 1: 636 config |= TOMOYO_CONFIG_WANT_REJECT_LOG; 637 break; 638 case 0: 639 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG; 640 break; 641 } 642 } 643 } 644 if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX) 645 profile->config[i] = config; 646 else if (config != TOMOYO_CONFIG_USE_DEFAULT) 647 profile->default_config = config; 648 return 0; 649} 650 651/** 652 * tomoyo_write_profile - Write profile table. 653 * 654 * @head: Pointer to "struct tomoyo_io_buffer". 655 * 656 * Returns 0 on success, negative value otherwise. 657 */ 658static int tomoyo_write_profile(struct tomoyo_io_buffer *head) 659{ 660 char *data = head->write_buf; 661 unsigned int i; 662 char *cp; 663 struct tomoyo_profile *profile; 664 if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version) 665 == 1) 666 return 0; 667 i = simple_strtoul(data, &cp, 10); 668 if (*cp != '-') 669 return -EINVAL; 670 data = cp + 1; 671 profile = tomoyo_assign_profile(head->w.ns, i); 672 if (!profile) 673 return -EINVAL; 674 cp = strchr(data, '='); 675 if (!cp) 676 return -EINVAL; 677 *cp++ = '\0'; 678 if (!strcmp(data, "COMMENT")) { 679 static DEFINE_SPINLOCK(lock); 680 const struct tomoyo_path_info *new_comment 681 = tomoyo_get_name(cp); 682 const struct tomoyo_path_info *old_comment; 683 if (!new_comment) 684 return -ENOMEM; 685 spin_lock(&lock); 686 old_comment = profile->comment; 687 profile->comment = new_comment; 688 spin_unlock(&lock); 689 tomoyo_put_name(old_comment); 690 return 0; 691 } 692 if (!strcmp(data, "PREFERENCE")) { 693 for (i = 0; i < TOMOYO_MAX_PREF; i++) 694 tomoyo_set_uint(&profile->pref[i], cp, 695 tomoyo_pref_keywords[i]); 696 return 0; 697 } 698 return tomoyo_set_mode(data, cp, profile); 699} 700 701/** 702 * tomoyo_print_config - Print mode for specified functionality. 703 * 704 * @head: Pointer to "struct tomoyo_io_buffer". 705 * @config: Mode for that functionality. 706 * 707 * Returns nothing. 708 * 709 * Caller prints functionality's name. 710 */ 711static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config) 712{ 713 tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n", 714 tomoyo_mode[config & 3], 715 tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG), 716 tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG)); 717} 718 719/** 720 * tomoyo_read_profile - Read profile table. 721 * 722 * @head: Pointer to "struct tomoyo_io_buffer". 723 * 724 * Returns nothing. 725 */ 726static void tomoyo_read_profile(struct tomoyo_io_buffer *head) 727{ 728 u8 index; 729 struct tomoyo_policy_namespace *ns = 730 container_of(head->r.ns, typeof(*ns), namespace_list); 731 const struct tomoyo_profile *profile; 732 if (head->r.eof) 733 return; 734 next: 735 index = head->r.index; 736 profile = ns->profile_ptr[index]; 737 switch (head->r.step) { 738 case 0: 739 tomoyo_print_namespace(head); 740 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n", 741 ns->profile_version); 742 head->r.step++; 743 break; 744 case 1: 745 for ( ; head->r.index < TOMOYO_MAX_PROFILES; 746 head->r.index++) 747 if (ns->profile_ptr[head->r.index]) 748 break; 749 if (head->r.index == TOMOYO_MAX_PROFILES) 750 return; 751 head->r.step++; 752 break; 753 case 2: 754 { 755 u8 i; 756 const struct tomoyo_path_info *comment = 757 profile->comment; 758 tomoyo_print_namespace(head); 759 tomoyo_io_printf(head, "%u-COMMENT=", index); 760 tomoyo_set_string(head, comment ? comment->name : ""); 761 tomoyo_set_lf(head); 762 tomoyo_io_printf(head, "%u-PREFERENCE={ ", index); 763 for (i = 0; i < TOMOYO_MAX_PREF; i++) 764 tomoyo_io_printf(head, "%s=%u ", 765 tomoyo_pref_keywords[i], 766 profile->pref[i]); 767 tomoyo_set_string(head, "}\n"); 768 head->r.step++; 769 } 770 break; 771 case 3: 772 { 773 tomoyo_print_namespace(head); 774 tomoyo_io_printf(head, "%u-%s", index, "CONFIG"); 775 tomoyo_print_config(head, profile->default_config); 776 head->r.bit = 0; 777 head->r.step++; 778 } 779 break; 780 case 4: 781 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX 782 + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) { 783 const u8 i = head->r.bit; 784 const u8 config = profile->config[i]; 785 if (config == TOMOYO_CONFIG_USE_DEFAULT) 786 continue; 787 tomoyo_print_namespace(head); 788 if (i < TOMOYO_MAX_MAC_INDEX) 789 tomoyo_io_printf(head, "%u-CONFIG::%s::%s", 790 index, 791 tomoyo_category_keywords 792 [tomoyo_index2category[i]], 793 tomoyo_mac_keywords[i]); 794 else 795 tomoyo_io_printf(head, "%u-CONFIG::%s", index, 796 tomoyo_mac_keywords[i]); 797 tomoyo_print_config(head, config); 798 head->r.bit++; 799 break; 800 } 801 if (head->r.bit == TOMOYO_MAX_MAC_INDEX 802 + TOMOYO_MAX_MAC_CATEGORY_INDEX) { 803 head->r.index++; 804 head->r.step = 1; 805 } 806 break; 807 } 808 if (tomoyo_flush(head)) 809 goto next; 810} 811 812/** 813 * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry. 814 * 815 * @a: Pointer to "struct tomoyo_acl_head". 816 * @b: Pointer to "struct tomoyo_acl_head". 817 * 818 * Returns true if @a == @b, false otherwise. 819 */ 820static bool tomoyo_same_manager(const struct tomoyo_acl_head *a, 821 const struct tomoyo_acl_head *b) 822{ 823 return container_of(a, struct tomoyo_manager, head)->manager == 824 container_of(b, struct tomoyo_manager, head)->manager; 825} 826 827/** 828 * tomoyo_update_manager_entry - Add a manager entry. 829 * 830 * @manager: The path to manager or the domainnamme. 831 * @is_delete: True if it is a delete request. 832 * 833 * Returns 0 on success, negative value otherwise. 834 * 835 * Caller holds tomoyo_read_lock(). 836 */ 837static int tomoyo_update_manager_entry(const char *manager, 838 const bool is_delete) 839{ 840 struct tomoyo_manager e = { }; 841 struct tomoyo_acl_param param = { 842 /* .ns = &tomoyo_kernel_namespace, */ 843 .is_delete = is_delete, 844 .list = &tomoyo_kernel_namespace. 845 policy_list[TOMOYO_ID_MANAGER], 846 }; 847 int error = is_delete ? -ENOENT : -ENOMEM; 848 if (tomoyo_domain_def(manager)) { 849 if (!tomoyo_correct_domain(manager)) 850 return -EINVAL; 851 e.is_domain = true; 852 } else { 853 if (!tomoyo_correct_path(manager)) 854 return -EINVAL; 855 } 856 e.manager = tomoyo_get_name(manager); 857 if (e.manager) { 858 error = tomoyo_update_policy(&e.head, sizeof(e), ¶m, 859 tomoyo_same_manager); 860 tomoyo_put_name(e.manager); 861 } 862 return error; 863} 864 865/** 866 * tomoyo_write_manager - Write manager policy. 867 * 868 * @head: Pointer to "struct tomoyo_io_buffer". 869 * 870 * Returns 0 on success, negative value otherwise. 871 * 872 * Caller holds tomoyo_read_lock(). 873 */ 874static int tomoyo_write_manager(struct tomoyo_io_buffer *head) 875{ 876 char *data = head->write_buf; 877 878 if (!strcmp(data, "manage_by_non_root")) { 879 tomoyo_manage_by_non_root = !head->w.is_delete; 880 return 0; 881 } 882 return tomoyo_update_manager_entry(data, head->w.is_delete); 883} 884 885/** 886 * tomoyo_read_manager - Read manager policy. 887 * 888 * @head: Pointer to "struct tomoyo_io_buffer". 889 * 890 * Caller holds tomoyo_read_lock(). 891 */ 892static void tomoyo_read_manager(struct tomoyo_io_buffer *head) 893{ 894 if (head->r.eof) 895 return; 896 list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace. 897 policy_list[TOMOYO_ID_MANAGER]) { 898 struct tomoyo_manager *ptr = 899 list_entry(head->r.acl, typeof(*ptr), head.list); 900 if (ptr->head.is_deleted) 901 continue; 902 if (!tomoyo_flush(head)) 903 return; 904 tomoyo_set_string(head, ptr->manager->name); 905 tomoyo_set_lf(head); 906 } 907 head->r.eof = true; 908} 909 910/** 911 * tomoyo_manager - Check whether the current process is a policy manager. 912 * 913 * Returns true if the current process is permitted to modify policy 914 * via /sys/kernel/security/tomoyo/ interface. 915 * 916 * Caller holds tomoyo_read_lock(). 917 */ 918static bool tomoyo_manager(void) 919{ 920 struct tomoyo_manager *ptr; 921 const char *exe; 922 const struct task_struct *task = current; 923 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname; 924 bool found = false; 925 926 if (!tomoyo_policy_loaded) 927 return true; 928 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid)) 929 return false; 930 list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace. 931 policy_list[TOMOYO_ID_MANAGER], head.list) { 932 if (!ptr->head.is_deleted && ptr->is_domain 933 && !tomoyo_pathcmp(domainname, ptr->manager)) { 934 found = true; 935 break; 936 } 937 } 938 if (found) 939 return true; 940 exe = tomoyo_get_exe(); 941 if (!exe) 942 return false; 943 list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace. 944 policy_list[TOMOYO_ID_MANAGER], head.list) { 945 if (!ptr->head.is_deleted && !ptr->is_domain 946 && !strcmp(exe, ptr->manager->name)) { 947 found = true; 948 break; 949 } 950 } 951 if (!found) { /* Reduce error messages. */ 952 static pid_t last_pid; 953 const pid_t pid = current->pid; 954 if (last_pid != pid) { 955 printk(KERN_WARNING "%s ( %s ) is not permitted to " 956 "update policies.\n", domainname->name, exe); 957 last_pid = pid; 958 } 959 } 960 kfree(exe); 961 return found; 962} 963 964/** 965 * tomoyo_select_domain - Parse select command. 966 * 967 * @head: Pointer to "struct tomoyo_io_buffer". 968 * @data: String to parse. 969 * 970 * Returns true on success, false otherwise. 971 * 972 * Caller holds tomoyo_read_lock(). 973 */ 974static bool tomoyo_select_domain(struct tomoyo_io_buffer *head, 975 const char *data) 976{ 977 unsigned int pid; 978 struct tomoyo_domain_info *domain = NULL; 979 bool global_pid = false; 980 if (strncmp(data, "select ", 7)) 981 return false; 982 data += 7; 983 if (sscanf(data, "pid=%u", &pid) == 1 || 984 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { 985 struct task_struct *p; 986 rcu_read_lock(); 987 if (global_pid) 988 p = find_task_by_pid_ns(pid, &init_pid_ns); 989 else 990 p = find_task_by_vpid(pid); 991 if (p) 992 domain = tomoyo_real_domain(p); 993 rcu_read_unlock(); 994 } else if (!strncmp(data, "domain=", 7)) { 995 if (tomoyo_domain_def(data + 7)) 996 domain = tomoyo_find_domain(data + 7); 997 } else 998 return false; 999 head->w.domain = domain; 1000 /* Accessing read_buf is safe because head->io_sem is held. */ 1001 if (!head->read_buf) 1002 return true; /* Do nothing if open(O_WRONLY). */ 1003 memset(&head->r, 0, sizeof(head->r)); 1004 head->r.print_this_domain_only = true; 1005 if (domain) 1006 head->r.domain = &domain->list; 1007 else 1008 head->r.eof = 1; 1009 tomoyo_io_printf(head, "# select %s\n", data); 1010 if (domain && domain->is_deleted) 1011 tomoyo_io_printf(head, "# This is a deleted domain.\n"); 1012 return true; 1013} 1014 1015/** 1016 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry. 1017 * 1018 * @a: Pointer to "struct tomoyo_acl_info". 1019 * @b: Pointer to "struct tomoyo_acl_info". 1020 * 1021 * Returns true if @a == @b, false otherwise. 1022 */ 1023static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a, 1024 const struct tomoyo_acl_info *b) 1025{ 1026 const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head); 1027 const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head); 1028 return p1->domainname == p2->domainname; 1029} 1030 1031/** 1032 * tomoyo_write_task - Update task related list. 1033 * 1034 * @param: Pointer to "struct tomoyo_acl_param". 1035 * 1036 * Returns 0 on success, negative value otherwise. 1037 * 1038 * Caller holds tomoyo_read_lock(). 1039 */ 1040static int tomoyo_write_task(struct tomoyo_acl_param *param) 1041{ 1042 int error = -EINVAL; 1043 if (tomoyo_str_starts(¶m->data, "manual_domain_transition ")) { 1044 struct tomoyo_task_acl e = { 1045 .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL, 1046 .domainname = tomoyo_get_domainname(param), 1047 }; 1048 if (e.domainname) 1049 error = tomoyo_update_domain(&e.head, sizeof(e), param, 1050 tomoyo_same_task_acl, 1051 NULL); 1052 tomoyo_put_name(e.domainname); 1053 } 1054 return error; 1055} 1056 1057/** 1058 * tomoyo_delete_domain - Delete a domain. 1059 * 1060 * @domainname: The name of domain. 1061 * 1062 * Returns 0. 1063 * 1064 * Caller holds tomoyo_read_lock(). 1065 */ 1066static int tomoyo_delete_domain(char *domainname) 1067{ 1068 struct tomoyo_domain_info *domain; 1069 struct tomoyo_path_info name; 1070 1071 name.name = domainname; 1072 tomoyo_fill_path_info(&name); 1073 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 1074 return 0; 1075 /* Is there an active domain? */ 1076 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 1077 /* Never delete tomoyo_kernel_domain */ 1078 if (domain == &tomoyo_kernel_domain) 1079 continue; 1080 if (domain->is_deleted || 1081 tomoyo_pathcmp(domain->domainname, &name)) 1082 continue; 1083 domain->is_deleted = true; 1084 break; 1085 } 1086 mutex_unlock(&tomoyo_policy_lock); 1087 return 0; 1088} 1089 1090/** 1091 * tomoyo_write_domain2 - Write domain policy. 1092 * 1093 * @ns: Pointer to "struct tomoyo_policy_namespace". 1094 * @list: Pointer to "struct list_head". 1095 * @data: Policy to be interpreted. 1096 * @is_delete: True if it is a delete request. 1097 * 1098 * Returns 0 on success, negative value otherwise. 1099 * 1100 * Caller holds tomoyo_read_lock(). 1101 */ 1102static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns, 1103 struct list_head *list, char *data, 1104 const bool is_delete) 1105{ 1106 struct tomoyo_acl_param param = { 1107 .ns = ns, 1108 .list = list, 1109 .data = data, 1110 .is_delete = is_delete, 1111 }; 1112 static const struct { 1113 const char *keyword; 1114 int (*write) (struct tomoyo_acl_param *); 1115 } tomoyo_callback[5] = { 1116 { "file ", tomoyo_write_file }, 1117 { "network inet ", tomoyo_write_inet_network }, 1118 { "network unix ", tomoyo_write_unix_network }, 1119 { "misc ", tomoyo_write_misc }, 1120 { "task ", tomoyo_write_task }, 1121 }; 1122 u8 i; 1123 1124 for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) { 1125 if (!tomoyo_str_starts(¶m.data, 1126 tomoyo_callback[i].keyword)) 1127 continue; 1128 return tomoyo_callback[i].write(¶m); 1129 } 1130 return -EINVAL; 1131} 1132 1133/* String table for domain flags. */ 1134const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = { 1135 [TOMOYO_DIF_QUOTA_WARNED] = "quota_exceeded\n", 1136 [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n", 1137}; 1138 1139/** 1140 * tomoyo_write_domain - Write domain policy. 1141 * 1142 * @head: Pointer to "struct tomoyo_io_buffer". 1143 * 1144 * Returns 0 on success, negative value otherwise. 1145 * 1146 * Caller holds tomoyo_read_lock(). 1147 */ 1148static int tomoyo_write_domain(struct tomoyo_io_buffer *head) 1149{ 1150 char *data = head->write_buf; 1151 struct tomoyo_policy_namespace *ns; 1152 struct tomoyo_domain_info *domain = head->w.domain; 1153 const bool is_delete = head->w.is_delete; 1154 bool is_select = !is_delete && tomoyo_str_starts(&data, "select "); 1155 unsigned int profile; 1156 if (*data == '<') { 1157 domain = NULL; 1158 if (is_delete) 1159 tomoyo_delete_domain(data); 1160 else if (is_select) 1161 domain = tomoyo_find_domain(data); 1162 else 1163 domain = tomoyo_assign_domain(data, false); 1164 head->w.domain = domain; 1165 return 0; 1166 } 1167 if (!domain) 1168 return -EINVAL; 1169 ns = domain->ns; 1170 if (sscanf(data, "use_profile %u", &profile) == 1 1171 && profile < TOMOYO_MAX_PROFILES) { 1172 if (!tomoyo_policy_loaded || ns->profile_ptr[profile]) 1173 domain->profile = (u8) profile; 1174 return 0; 1175 } 1176 if (sscanf(data, "use_group %u\n", &profile) == 1 1177 && profile < TOMOYO_MAX_ACL_GROUPS) { 1178 if (!is_delete) 1179 domain->group = (u8) profile; 1180 return 0; 1181 } 1182 for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) { 1183 const char *cp = tomoyo_dif[profile]; 1184 if (strncmp(data, cp, strlen(cp) - 1)) 1185 continue; 1186 domain->flags[profile] = !is_delete; 1187 return 0; 1188 } 1189 return tomoyo_write_domain2(ns, &domain->acl_info_list, data, 1190 is_delete); 1191} 1192 1193/** 1194 * tomoyo_print_condition - Print condition part. 1195 * 1196 * @head: Pointer to "struct tomoyo_io_buffer". 1197 * @cond: Pointer to "struct tomoyo_condition". 1198 * 1199 * Returns true on success, false otherwise. 1200 */ 1201static bool tomoyo_print_condition(struct tomoyo_io_buffer *head, 1202 const struct tomoyo_condition *cond) 1203{ 1204 switch (head->r.cond_step) { 1205 case 0: 1206 head->r.cond_index = 0; 1207 head->r.cond_step++; 1208 if (cond->transit) { 1209 tomoyo_set_space(head); 1210 tomoyo_set_string(head, cond->transit->name); 1211 } 1212 /* fall through */ 1213 case 1: 1214 { 1215 const u16 condc = cond->condc; 1216 const struct tomoyo_condition_element *condp = 1217 (typeof(condp)) (cond + 1); 1218 const struct tomoyo_number_union *numbers_p = 1219 (typeof(numbers_p)) (condp + condc); 1220 const struct tomoyo_name_union *names_p = 1221 (typeof(names_p)) 1222 (numbers_p + cond->numbers_count); 1223 const struct tomoyo_argv *argv = 1224 (typeof(argv)) (names_p + cond->names_count); 1225 const struct tomoyo_envp *envp = 1226 (typeof(envp)) (argv + cond->argc); 1227 u16 skip; 1228 for (skip = 0; skip < head->r.cond_index; skip++) { 1229 const u8 left = condp->left; 1230 const u8 right = condp->right; 1231 condp++; 1232 switch (left) { 1233 case TOMOYO_ARGV_ENTRY: 1234 argv++; 1235 continue; 1236 case TOMOYO_ENVP_ENTRY: 1237 envp++; 1238 continue; 1239 case TOMOYO_NUMBER_UNION: 1240 numbers_p++; 1241 break; 1242 } 1243 switch (right) { 1244 case TOMOYO_NAME_UNION: 1245 names_p++; 1246 break; 1247 case TOMOYO_NUMBER_UNION: 1248 numbers_p++; 1249 break; 1250 } 1251 } 1252 while (head->r.cond_index < condc) { 1253 const u8 match = condp->equals; 1254 const u8 left = condp->left; 1255 const u8 right = condp->right; 1256 if (!tomoyo_flush(head)) 1257 return false; 1258 condp++; 1259 head->r.cond_index++; 1260 tomoyo_set_space(head); 1261 switch (left) { 1262 case TOMOYO_ARGV_ENTRY: 1263 tomoyo_io_printf(head, 1264 "exec.argv[%lu]%s=\"", 1265 argv->index, argv-> 1266 is_not ? "!" : ""); 1267 tomoyo_set_string(head, 1268 argv->value->name); 1269 tomoyo_set_string(head, "\""); 1270 argv++; 1271 continue; 1272 case TOMOYO_ENVP_ENTRY: 1273 tomoyo_set_string(head, 1274 "exec.envp[\""); 1275 tomoyo_set_string(head, 1276 envp->name->name); 1277 tomoyo_io_printf(head, "\"]%s=", envp-> 1278 is_not ? "!" : ""); 1279 if (envp->value) { 1280 tomoyo_set_string(head, "\""); 1281 tomoyo_set_string(head, envp-> 1282 value->name); 1283 tomoyo_set_string(head, "\""); 1284 } else { 1285 tomoyo_set_string(head, 1286 "NULL"); 1287 } 1288 envp++; 1289 continue; 1290 case TOMOYO_NUMBER_UNION: 1291 tomoyo_print_number_union_nospace 1292 (head, numbers_p++); 1293 break; 1294 default: 1295 tomoyo_set_string(head, 1296 tomoyo_condition_keyword[left]); 1297 break; 1298 } 1299 tomoyo_set_string(head, match ? "=" : "!="); 1300 switch (right) { 1301 case TOMOYO_NAME_UNION: 1302 tomoyo_print_name_union_quoted 1303 (head, names_p++); 1304 break; 1305 case TOMOYO_NUMBER_UNION: 1306 tomoyo_print_number_union_nospace 1307 (head, numbers_p++); 1308 break; 1309 default: 1310 tomoyo_set_string(head, 1311 tomoyo_condition_keyword[right]); 1312 break; 1313 } 1314 } 1315 } 1316 head->r.cond_step++; 1317 /* fall through */ 1318 case 2: 1319 if (!tomoyo_flush(head)) 1320 break; 1321 head->r.cond_step++; 1322 /* fall through */ 1323 case 3: 1324 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO) 1325 tomoyo_io_printf(head, " grant_log=%s", 1326 tomoyo_yesno(cond->grant_log == 1327 TOMOYO_GRANTLOG_YES)); 1328 tomoyo_set_lf(head); 1329 return true; 1330 } 1331 return false; 1332} 1333 1334/** 1335 * tomoyo_set_group - Print "acl_group " header keyword and category name. 1336 * 1337 * @head: Pointer to "struct tomoyo_io_buffer". 1338 * @category: Category name. 1339 * 1340 * Returns nothing. 1341 */ 1342static void tomoyo_set_group(struct tomoyo_io_buffer *head, 1343 const char *category) 1344{ 1345 if (head->type == TOMOYO_EXCEPTIONPOLICY) { 1346 tomoyo_print_namespace(head); 1347 tomoyo_io_printf(head, "acl_group %u ", 1348 head->r.acl_group_index); 1349 } 1350 tomoyo_set_string(head, category); 1351} 1352 1353/** 1354 * tomoyo_print_entry - Print an ACL entry. 1355 * 1356 * @head: Pointer to "struct tomoyo_io_buffer". 1357 * @acl: Pointer to an ACL entry. 1358 * 1359 * Returns true on success, false otherwise. 1360 */ 1361static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, 1362 struct tomoyo_acl_info *acl) 1363{ 1364 const u8 acl_type = acl->type; 1365 bool first = true; 1366 u8 bit; 1367 1368 if (head->r.print_cond_part) 1369 goto print_cond_part; 1370 if (acl->is_deleted) 1371 return true; 1372 if (!tomoyo_flush(head)) 1373 return false; 1374 else if (acl_type == TOMOYO_TYPE_PATH_ACL) { 1375 struct tomoyo_path_acl *ptr = 1376 container_of(acl, typeof(*ptr), head); 1377 const u16 perm = ptr->perm; 1378 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { 1379 if (!(perm & (1 << bit))) 1380 continue; 1381 if (head->r.print_transition_related_only && 1382 bit != TOMOYO_TYPE_EXECUTE) 1383 continue; 1384 if (first) { 1385 tomoyo_set_group(head, "file "); 1386 first = false; 1387 } else { 1388 tomoyo_set_slash(head); 1389 } 1390 tomoyo_set_string(head, tomoyo_path_keyword[bit]); 1391 } 1392 if (first) 1393 return true; 1394 tomoyo_print_name_union(head, &ptr->name); 1395 } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) { 1396 struct tomoyo_task_acl *ptr = 1397 container_of(acl, typeof(*ptr), head); 1398 tomoyo_set_group(head, "task "); 1399 tomoyo_set_string(head, "manual_domain_transition "); 1400 tomoyo_set_string(head, ptr->domainname->name); 1401 } else if (head->r.print_transition_related_only) { 1402 return true; 1403 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) { 1404 struct tomoyo_path2_acl *ptr = 1405 container_of(acl, typeof(*ptr), head); 1406 const u8 perm = ptr->perm; 1407 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) { 1408 if (!(perm & (1 << bit))) 1409 continue; 1410 if (first) { 1411 tomoyo_set_group(head, "file "); 1412 first = false; 1413 } else { 1414 tomoyo_set_slash(head); 1415 } 1416 tomoyo_set_string(head, tomoyo_mac_keywords 1417 [tomoyo_pp2mac[bit]]); 1418 } 1419 if (first) 1420 return true; 1421 tomoyo_print_name_union(head, &ptr->name1); 1422 tomoyo_print_name_union(head, &ptr->name2); 1423 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) { 1424 struct tomoyo_path_number_acl *ptr = 1425 container_of(acl, typeof(*ptr), head); 1426 const u8 perm = ptr->perm; 1427 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) { 1428 if (!(perm & (1 << bit))) 1429 continue; 1430 if (first) { 1431 tomoyo_set_group(head, "file "); 1432 first = false; 1433 } else { 1434 tomoyo_set_slash(head); 1435 } 1436 tomoyo_set_string(head, tomoyo_mac_keywords 1437 [tomoyo_pn2mac[bit]]); 1438 } 1439 if (first) 1440 return true; 1441 tomoyo_print_name_union(head, &ptr->name); 1442 tomoyo_print_number_union(head, &ptr->number); 1443 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) { 1444 struct tomoyo_mkdev_acl *ptr = 1445 container_of(acl, typeof(*ptr), head); 1446 const u8 perm = ptr->perm; 1447 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) { 1448 if (!(perm & (1 << bit))) 1449 continue; 1450 if (first) { 1451 tomoyo_set_group(head, "file "); 1452 first = false; 1453 } else { 1454 tomoyo_set_slash(head); 1455 } 1456 tomoyo_set_string(head, tomoyo_mac_keywords 1457 [tomoyo_pnnn2mac[bit]]); 1458 } 1459 if (first) 1460 return true; 1461 tomoyo_print_name_union(head, &ptr->name); 1462 tomoyo_print_number_union(head, &ptr->mode); 1463 tomoyo_print_number_union(head, &ptr->major); 1464 tomoyo_print_number_union(head, &ptr->minor); 1465 } else if (acl_type == TOMOYO_TYPE_INET_ACL) { 1466 struct tomoyo_inet_acl *ptr = 1467 container_of(acl, typeof(*ptr), head); 1468 const u8 perm = ptr->perm; 1469 1470 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) { 1471 if (!(perm & (1 << bit))) 1472 continue; 1473 if (first) { 1474 tomoyo_set_group(head, "network inet "); 1475 tomoyo_set_string(head, tomoyo_proto_keyword 1476 [ptr->protocol]); 1477 tomoyo_set_space(head); 1478 first = false; 1479 } else { 1480 tomoyo_set_slash(head); 1481 } 1482 tomoyo_set_string(head, tomoyo_socket_keyword[bit]); 1483 } 1484 if (first) 1485 return true; 1486 tomoyo_set_space(head); 1487 if (ptr->address.group) { 1488 tomoyo_set_string(head, "@"); 1489 tomoyo_set_string(head, ptr->address.group->group_name 1490 ->name); 1491 } else { 1492 char buf[128]; 1493 tomoyo_print_ip(buf, sizeof(buf), &ptr->address); 1494 tomoyo_io_printf(head, "%s", buf); 1495 } 1496 tomoyo_print_number_union(head, &ptr->port); 1497 } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) { 1498 struct tomoyo_unix_acl *ptr = 1499 container_of(acl, typeof(*ptr), head); 1500 const u8 perm = ptr->perm; 1501 1502 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) { 1503 if (!(perm & (1 << bit))) 1504 continue; 1505 if (first) { 1506 tomoyo_set_group(head, "network unix "); 1507 tomoyo_set_string(head, tomoyo_proto_keyword 1508 [ptr->protocol]); 1509 tomoyo_set_space(head); 1510 first = false; 1511 } else { 1512 tomoyo_set_slash(head); 1513 } 1514 tomoyo_set_string(head, tomoyo_socket_keyword[bit]); 1515 } 1516 if (first) 1517 return true; 1518 tomoyo_print_name_union(head, &ptr->name); 1519 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) { 1520 struct tomoyo_mount_acl *ptr = 1521 container_of(acl, typeof(*ptr), head); 1522 tomoyo_set_group(head, "file mount"); 1523 tomoyo_print_name_union(head, &ptr->dev_name); 1524 tomoyo_print_name_union(head, &ptr->dir_name); 1525 tomoyo_print_name_union(head, &ptr->fs_type); 1526 tomoyo_print_number_union(head, &ptr->flags); 1527 } else if (acl_type == TOMOYO_TYPE_ENV_ACL) { 1528 struct tomoyo_env_acl *ptr = 1529 container_of(acl, typeof(*ptr), head); 1530 1531 tomoyo_set_group(head, "misc env "); 1532 tomoyo_set_string(head, ptr->env->name); 1533 } 1534 if (acl->cond) { 1535 head->r.print_cond_part = true; 1536 head->r.cond_step = 0; 1537 if (!tomoyo_flush(head)) 1538 return false; 1539print_cond_part: 1540 if (!tomoyo_print_condition(head, acl->cond)) 1541 return false; 1542 head->r.print_cond_part = false; 1543 } else { 1544 tomoyo_set_lf(head); 1545 } 1546 return true; 1547} 1548 1549/** 1550 * tomoyo_read_domain2 - Read domain policy. 1551 * 1552 * @head: Pointer to "struct tomoyo_io_buffer". 1553 * @list: Pointer to "struct list_head". 1554 * 1555 * Caller holds tomoyo_read_lock(). 1556 * 1557 * Returns true on success, false otherwise. 1558 */ 1559static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head, 1560 struct list_head *list) 1561{ 1562 list_for_each_cookie(head->r.acl, list) { 1563 struct tomoyo_acl_info *ptr = 1564 list_entry(head->r.acl, typeof(*ptr), list); 1565 if (!tomoyo_print_entry(head, ptr)) 1566 return false; 1567 } 1568 head->r.acl = NULL; 1569 return true; 1570} 1571 1572/** 1573 * tomoyo_read_domain - Read domain policy. 1574 * 1575 * @head: Pointer to "struct tomoyo_io_buffer". 1576 * 1577 * Caller holds tomoyo_read_lock(). 1578 */ 1579static void tomoyo_read_domain(struct tomoyo_io_buffer *head) 1580{ 1581 if (head->r.eof) 1582 return; 1583 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) { 1584 struct tomoyo_domain_info *domain = 1585 list_entry(head->r.domain, typeof(*domain), list); 1586 switch (head->r.step) { 1587 u8 i; 1588 case 0: 1589 if (domain->is_deleted && 1590 !head->r.print_this_domain_only) 1591 continue; 1592 /* Print domainname and flags. */ 1593 tomoyo_set_string(head, domain->domainname->name); 1594 tomoyo_set_lf(head); 1595 tomoyo_io_printf(head, "use_profile %u\n", 1596 domain->profile); 1597 tomoyo_io_printf(head, "use_group %u\n", 1598 domain->group); 1599 for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++) 1600 if (domain->flags[i]) 1601 tomoyo_set_string(head, tomoyo_dif[i]); 1602 head->r.step++; 1603 tomoyo_set_lf(head); 1604 /* fall through */ 1605 case 1: 1606 if (!tomoyo_read_domain2(head, &domain->acl_info_list)) 1607 return; 1608 head->r.step++; 1609 if (!tomoyo_set_lf(head)) 1610 return; 1611 /* fall through */ 1612 case 2: 1613 head->r.step = 0; 1614 if (head->r.print_this_domain_only) 1615 goto done; 1616 } 1617 } 1618 done: 1619 head->r.eof = true; 1620} 1621 1622/** 1623 * tomoyo_write_pid: Specify PID to obtain domainname. 1624 * 1625 * @head: Pointer to "struct tomoyo_io_buffer". 1626 * 1627 * Returns 0. 1628 */ 1629static int tomoyo_write_pid(struct tomoyo_io_buffer *head) 1630{ 1631 head->r.eof = false; 1632 return 0; 1633} 1634 1635/** 1636 * tomoyo_read_pid - Get domainname of the specified PID. 1637 * 1638 * @head: Pointer to "struct tomoyo_io_buffer". 1639 * 1640 * Returns the domainname which the specified PID is in on success, 1641 * empty string otherwise. 1642 * The PID is specified by tomoyo_write_pid() so that the user can obtain 1643 * using read()/write() interface rather than sysctl() interface. 1644 */ 1645static void tomoyo_read_pid(struct tomoyo_io_buffer *head) 1646{ 1647 char *buf = head->write_buf; 1648 bool global_pid = false; 1649 unsigned int pid; 1650 struct task_struct *p; 1651 struct tomoyo_domain_info *domain = NULL; 1652 1653 /* Accessing write_buf is safe because head->io_sem is held. */ 1654 if (!buf) { 1655 head->r.eof = true; 1656 return; /* Do nothing if open(O_RDONLY). */ 1657 } 1658 if (head->r.w_pos || head->r.eof) 1659 return; 1660 head->r.eof = true; 1661 if (tomoyo_str_starts(&buf, "global-pid ")) 1662 global_pid = true; 1663 pid = (unsigned int) simple_strtoul(buf, NULL, 10); 1664 rcu_read_lock(); 1665 if (global_pid) 1666 p = find_task_by_pid_ns(pid, &init_pid_ns); 1667 else 1668 p = find_task_by_vpid(pid); 1669 if (p) 1670 domain = tomoyo_real_domain(p); 1671 rcu_read_unlock(); 1672 if (!domain) 1673 return; 1674 tomoyo_io_printf(head, "%u %u ", pid, domain->profile); 1675 tomoyo_set_string(head, domain->domainname->name); 1676} 1677 1678/* String table for domain transition control keywords. */ 1679static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = { 1680 [TOMOYO_TRANSITION_CONTROL_NO_RESET] = "no_reset_domain ", 1681 [TOMOYO_TRANSITION_CONTROL_RESET] = "reset_domain ", 1682 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ", 1683 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ", 1684 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ", 1685 [TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain ", 1686}; 1687 1688/* String table for grouping keywords. */ 1689static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = { 1690 [TOMOYO_PATH_GROUP] = "path_group ", 1691 [TOMOYO_NUMBER_GROUP] = "number_group ", 1692 [TOMOYO_ADDRESS_GROUP] = "address_group ", 1693}; 1694 1695/** 1696 * tomoyo_write_exception - Write exception policy. 1697 * 1698 * @head: Pointer to "struct tomoyo_io_buffer". 1699 * 1700 * Returns 0 on success, negative value otherwise. 1701 * 1702 * Caller holds tomoyo_read_lock(). 1703 */ 1704static int tomoyo_write_exception(struct tomoyo_io_buffer *head) 1705{ 1706 const bool is_delete = head->w.is_delete; 1707 struct tomoyo_acl_param param = { 1708 .ns = head->w.ns, 1709 .is_delete = is_delete, 1710 .data = head->write_buf, 1711 }; 1712 u8 i; 1713 if (tomoyo_str_starts(¶m.data, "aggregator ")) 1714 return tomoyo_write_aggregator(¶m); 1715 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++) 1716 if (tomoyo_str_starts(¶m.data, tomoyo_transition_type[i])) 1717 return tomoyo_write_transition_control(¶m, i); 1718 for (i = 0; i < TOMOYO_MAX_GROUP; i++) 1719 if (tomoyo_str_starts(¶m.data, tomoyo_group_name[i])) 1720 return tomoyo_write_group(¶m, i); 1721 if (tomoyo_str_starts(¶m.data, "acl_group ")) { 1722 unsigned int group; 1723 char *data; 1724 group = simple_strtoul(param.data, &data, 10); 1725 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ') 1726 return tomoyo_write_domain2 1727 (head->w.ns, &head->w.ns->acl_group[group], 1728 data, is_delete); 1729 } 1730 return -EINVAL; 1731} 1732 1733/** 1734 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list. 1735 * 1736 * @head: Pointer to "struct tomoyo_io_buffer". 1737 * @idx: Index number. 1738 * 1739 * Returns true on success, false otherwise. 1740 * 1741 * Caller holds tomoyo_read_lock(). 1742 */ 1743static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx) 1744{ 1745 struct tomoyo_policy_namespace *ns = 1746 container_of(head->r.ns, typeof(*ns), namespace_list); 1747 struct list_head *list = &ns->group_list[idx]; 1748 list_for_each_cookie(head->r.group, list) { 1749 struct tomoyo_group *group = 1750 list_entry(head->r.group, typeof(*group), head.list); 1751 list_for_each_cookie(head->r.acl, &group->member_list) { 1752 struct tomoyo_acl_head *ptr = 1753 list_entry(head->r.acl, typeof(*ptr), list); 1754 if (ptr->is_deleted) 1755 continue; 1756 if (!tomoyo_flush(head)) 1757 return false; 1758 tomoyo_print_namespace(head); 1759 tomoyo_set_string(head, tomoyo_group_name[idx]); 1760 tomoyo_set_string(head, group->group_name->name); 1761 if (idx == TOMOYO_PATH_GROUP) { 1762 tomoyo_set_space(head); 1763 tomoyo_set_string(head, container_of 1764 (ptr, struct tomoyo_path_group, 1765 head)->member_name->name); 1766 } else if (idx == TOMOYO_NUMBER_GROUP) { 1767 tomoyo_print_number_union(head, &container_of 1768 (ptr, 1769 struct tomoyo_number_group, 1770 head)->number); 1771 } else if (idx == TOMOYO_ADDRESS_GROUP) { 1772 char buffer[128]; 1773 1774 struct tomoyo_address_group *member = 1775 container_of(ptr, typeof(*member), 1776 head); 1777 tomoyo_print_ip(buffer, sizeof(buffer), 1778 &member->address); 1779 tomoyo_io_printf(head, " %s", buffer); 1780 } 1781 tomoyo_set_lf(head); 1782 } 1783 head->r.acl = NULL; 1784 } 1785 head->r.group = NULL; 1786 return true; 1787} 1788 1789/** 1790 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list. 1791 * 1792 * @head: Pointer to "struct tomoyo_io_buffer". 1793 * @idx: Index number. 1794 * 1795 * Returns true on success, false otherwise. 1796 * 1797 * Caller holds tomoyo_read_lock(). 1798 */ 1799static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx) 1800{ 1801 struct tomoyo_policy_namespace *ns = 1802 container_of(head->r.ns, typeof(*ns), namespace_list); 1803 struct list_head *list = &ns->policy_list[idx]; 1804 list_for_each_cookie(head->r.acl, list) { 1805 struct tomoyo_acl_head *acl = 1806 container_of(head->r.acl, typeof(*acl), list); 1807 if (acl->is_deleted) 1808 continue; 1809 if (!tomoyo_flush(head)) 1810 return false; 1811 switch (idx) { 1812 case TOMOYO_ID_TRANSITION_CONTROL: 1813 { 1814 struct tomoyo_transition_control *ptr = 1815 container_of(acl, typeof(*ptr), head); 1816 tomoyo_print_namespace(head); 1817 tomoyo_set_string(head, tomoyo_transition_type 1818 [ptr->type]); 1819 tomoyo_set_string(head, ptr->program ? 1820 ptr->program->name : "any"); 1821 tomoyo_set_string(head, " from "); 1822 tomoyo_set_string(head, ptr->domainname ? 1823 ptr->domainname->name : 1824 "any"); 1825 } 1826 break; 1827 case TOMOYO_ID_AGGREGATOR: 1828 { 1829 struct tomoyo_aggregator *ptr = 1830 container_of(acl, typeof(*ptr), head); 1831 tomoyo_print_namespace(head); 1832 tomoyo_set_string(head, "aggregator "); 1833 tomoyo_set_string(head, 1834 ptr->original_name->name); 1835 tomoyo_set_space(head); 1836 tomoyo_set_string(head, 1837 ptr->aggregated_name->name); 1838 } 1839 break; 1840 default: 1841 continue; 1842 } 1843 tomoyo_set_lf(head); 1844 } 1845 head->r.acl = NULL; 1846 return true; 1847} 1848 1849/** 1850 * tomoyo_read_exception - Read exception policy. 1851 * 1852 * @head: Pointer to "struct tomoyo_io_buffer". 1853 * 1854 * Caller holds tomoyo_read_lock(). 1855 */ 1856static void tomoyo_read_exception(struct tomoyo_io_buffer *head) 1857{ 1858 struct tomoyo_policy_namespace *ns = 1859 container_of(head->r.ns, typeof(*ns), namespace_list); 1860 if (head->r.eof) 1861 return; 1862 while (head->r.step < TOMOYO_MAX_POLICY && 1863 tomoyo_read_policy(head, head->r.step)) 1864 head->r.step++; 1865 if (head->r.step < TOMOYO_MAX_POLICY) 1866 return; 1867 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP && 1868 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY)) 1869 head->r.step++; 1870 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP) 1871 return; 1872 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP 1873 + TOMOYO_MAX_ACL_GROUPS) { 1874 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY 1875 - TOMOYO_MAX_GROUP; 1876 if (!tomoyo_read_domain2(head, &ns->acl_group 1877 [head->r.acl_group_index])) 1878 return; 1879 head->r.step++; 1880 } 1881 head->r.eof = true; 1882} 1883 1884/* Wait queue for kernel -> userspace notification. */ 1885static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait); 1886/* Wait queue for userspace -> kernel notification. */ 1887static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait); 1888 1889/* Structure for query. */ 1890struct tomoyo_query { 1891 struct list_head list; 1892 char *query; 1893 size_t query_len; 1894 unsigned int serial; 1895 u8 timer; 1896 u8 answer; 1897 u8 retry; 1898}; 1899 1900/* The list for "struct tomoyo_query". */ 1901static LIST_HEAD(tomoyo_query_list); 1902 1903/* Lock for manipulating tomoyo_query_list. */ 1904static DEFINE_SPINLOCK(tomoyo_query_list_lock); 1905 1906/* 1907 * Number of "struct file" referring /sys/kernel/security/tomoyo/query 1908 * interface. 1909 */ 1910static atomic_t tomoyo_query_observers = ATOMIC_INIT(0); 1911 1912/** 1913 * tomoyo_truncate - Truncate a line. 1914 * 1915 * @str: String to truncate. 1916 * 1917 * Returns length of truncated @str. 1918 */ 1919static int tomoyo_truncate(char *str) 1920{ 1921 char *start = str; 1922 while (*(unsigned char *) str > (unsigned char) ' ') 1923 str++; 1924 *str = '\0'; 1925 return strlen(start) + 1; 1926} 1927 1928/** 1929 * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode. 1930 * 1931 * @domain: Pointer to "struct tomoyo_domain_info". 1932 * @header: Lines containing ACL. 1933 * 1934 * Returns nothing. 1935 */ 1936static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header) 1937{ 1938 char *buffer; 1939 char *realpath = NULL; 1940 char *argv0 = NULL; 1941 char *symlink = NULL; 1942 char *cp = strchr(header, '\n'); 1943 int len; 1944 if (!cp) 1945 return; 1946 cp = strchr(cp + 1, '\n'); 1947 if (!cp) 1948 return; 1949 *cp++ = '\0'; 1950 len = strlen(cp) + 1; 1951 /* strstr() will return NULL if ordering is wrong. */ 1952 if (*cp == 'f') { 1953 argv0 = strstr(header, " argv[]={ \""); 1954 if (argv0) { 1955 argv0 += 10; 1956 len += tomoyo_truncate(argv0) + 14; 1957 } 1958 realpath = strstr(header, " exec={ realpath=\""); 1959 if (realpath) { 1960 realpath += 8; 1961 len += tomoyo_truncate(realpath) + 6; 1962 } 1963 symlink = strstr(header, " symlink.target=\""); 1964 if (symlink) 1965 len += tomoyo_truncate(symlink + 1) + 1; 1966 } 1967 buffer = kmalloc(len, GFP_NOFS); 1968 if (!buffer) 1969 return; 1970 snprintf(buffer, len - 1, "%s", cp); 1971 if (realpath) 1972 tomoyo_addprintf(buffer, len, " exec.%s", realpath); 1973 if (argv0) 1974 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0); 1975 if (symlink) 1976 tomoyo_addprintf(buffer, len, "%s", symlink); 1977 tomoyo_normalize_line(buffer); 1978 if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer, 1979 false)) 1980 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES); 1981 kfree(buffer); 1982} 1983 1984/** 1985 * tomoyo_supervisor - Ask for the supervisor's decision. 1986 * 1987 * @r: Pointer to "struct tomoyo_request_info". 1988 * @fmt: The printf()'s format string, followed by parameters. 1989 * 1990 * Returns 0 if the supervisor decided to permit the access request which 1991 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the 1992 * supervisor decided to retry the access request which violated the policy in 1993 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise. 1994 */ 1995int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) 1996{ 1997 va_list args; 1998 int error; 1999 int len; 2000 static unsigned int tomoyo_serial; 2001 struct tomoyo_query entry = { }; 2002 bool quota_exceeded = false; 2003 va_start(args, fmt); 2004 len = vsnprintf((char *) &len, 1, fmt, args) + 1; 2005 va_end(args); 2006 /* Write /sys/kernel/security/tomoyo/audit. */ 2007 va_start(args, fmt); 2008 tomoyo_write_log2(r, len, fmt, args); 2009 va_end(args); 2010 /* Nothing more to do if granted. */ 2011 if (r->granted) 2012 return 0; 2013 if (r->mode) 2014 tomoyo_update_stat(r->mode); 2015 switch (r->mode) { 2016 case TOMOYO_CONFIG_ENFORCING: 2017 error = -EPERM; 2018 if (atomic_read(&tomoyo_query_observers)) 2019 break; 2020 goto out; 2021 case TOMOYO_CONFIG_LEARNING: 2022 error = 0; 2023 /* Check max_learning_entry parameter. */ 2024 if (tomoyo_domain_quota_is_ok(r)) 2025 break; 2026 /* fall through */ 2027 default: 2028 return 0; 2029 } 2030 /* Get message. */ 2031 va_start(args, fmt); 2032 entry.query = tomoyo_init_log(r, len, fmt, args); 2033 va_end(args); 2034 if (!entry.query) 2035 goto out; 2036 entry.query_len = strlen(entry.query) + 1; 2037 if (!error) { 2038 tomoyo_add_entry(r->domain, entry.query); 2039 goto out; 2040 } 2041 len = tomoyo_round2(entry.query_len); 2042 spin_lock(&tomoyo_query_list_lock); 2043 if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] && 2044 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len 2045 >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) { 2046 quota_exceeded = true; 2047 } else { 2048 entry.serial = tomoyo_serial++; 2049 entry.retry = r->retry; 2050 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len; 2051 list_add_tail(&entry.list, &tomoyo_query_list); 2052 } 2053 spin_unlock(&tomoyo_query_list_lock); 2054 if (quota_exceeded) 2055 goto out; 2056 /* Give 10 seconds for supervisor's opinion. */ 2057 while (entry.timer < 10) { 2058 wake_up_all(&tomoyo_query_wait); 2059 if (wait_event_interruptible_timeout 2060 (tomoyo_answer_wait, entry.answer || 2061 !atomic_read(&tomoyo_query_observers), HZ)) 2062 break; 2063 else 2064 entry.timer++; 2065 } 2066 spin_lock(&tomoyo_query_list_lock); 2067 list_del(&entry.list); 2068 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len; 2069 spin_unlock(&tomoyo_query_list_lock); 2070 switch (entry.answer) { 2071 case 3: /* Asked to retry by administrator. */ 2072 error = TOMOYO_RETRY_REQUEST; 2073 r->retry++; 2074 break; 2075 case 1: 2076 /* Granted by administrator. */ 2077 error = 0; 2078 break; 2079 default: 2080 /* Timed out or rejected by administrator. */ 2081 break; 2082 } 2083out: 2084 kfree(entry.query); 2085 return error; 2086} 2087 2088/** 2089 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query. 2090 * 2091 * @file: Pointer to "struct file". 2092 * @wait: Pointer to "poll_table". 2093 * 2094 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. 2095 * 2096 * Waits for access requests which violated policy in enforcing mode. 2097 */ 2098static int tomoyo_poll_query(struct file *file, poll_table *wait) 2099{ 2100 struct list_head *tmp; 2101 bool found = false; 2102 u8 i; 2103 for (i = 0; i < 2; i++) { 2104 spin_lock(&tomoyo_query_list_lock); 2105 list_for_each(tmp, &tomoyo_query_list) { 2106 struct tomoyo_query *ptr = 2107 list_entry(tmp, typeof(*ptr), list); 2108 if (ptr->answer) 2109 continue; 2110 found = true; 2111 break; 2112 } 2113 spin_unlock(&tomoyo_query_list_lock); 2114 if (found) 2115 return POLLIN | POLLRDNORM; 2116 if (i) 2117 break; 2118 poll_wait(file, &tomoyo_query_wait, wait); 2119 } 2120 return 0; 2121} 2122 2123/** 2124 * tomoyo_read_query - Read access requests which violated policy in enforcing mode. 2125 * 2126 * @head: Pointer to "struct tomoyo_io_buffer". 2127 */ 2128static void tomoyo_read_query(struct tomoyo_io_buffer *head) 2129{ 2130 struct list_head *tmp; 2131 unsigned int pos = 0; 2132 size_t len = 0; 2133 char *buf; 2134 if (head->r.w_pos) 2135 return; 2136 if (head->read_buf) { 2137 kfree(head->read_buf); 2138 head->read_buf = NULL; 2139 } 2140 spin_lock(&tomoyo_query_list_lock); 2141 list_for_each(tmp, &tomoyo_query_list) { 2142 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2143 if (ptr->answer) 2144 continue; 2145 if (pos++ != head->r.query_index) 2146 continue; 2147 len = ptr->query_len; 2148 break; 2149 } 2150 spin_unlock(&tomoyo_query_list_lock); 2151 if (!len) { 2152 head->r.query_index = 0; 2153 return; 2154 } 2155 buf = kzalloc(len + 32, GFP_NOFS); 2156 if (!buf) 2157 return; 2158 pos = 0; 2159 spin_lock(&tomoyo_query_list_lock); 2160 list_for_each(tmp, &tomoyo_query_list) { 2161 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2162 if (ptr->answer) 2163 continue; 2164 if (pos++ != head->r.query_index) 2165 continue; 2166 /* 2167 * Some query can be skipped because tomoyo_query_list 2168 * can change, but I don't care. 2169 */ 2170 if (len == ptr->query_len) 2171 snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial, 2172 ptr->retry, ptr->query); 2173 break; 2174 } 2175 spin_unlock(&tomoyo_query_list_lock); 2176 if (buf[0]) { 2177 head->read_buf = buf; 2178 head->r.w[head->r.w_pos++] = buf; 2179 head->r.query_index++; 2180 } else { 2181 kfree(buf); 2182 } 2183} 2184 2185/** 2186 * tomoyo_write_answer - Write the supervisor's decision. 2187 * 2188 * @head: Pointer to "struct tomoyo_io_buffer". 2189 * 2190 * Returns 0 on success, -EINVAL otherwise. 2191 */ 2192static int tomoyo_write_answer(struct tomoyo_io_buffer *head) 2193{ 2194 char *data = head->write_buf; 2195 struct list_head *tmp; 2196 unsigned int serial; 2197 unsigned int answer; 2198 spin_lock(&tomoyo_query_list_lock); 2199 list_for_each(tmp, &tomoyo_query_list) { 2200 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2201 ptr->timer = 0; 2202 } 2203 spin_unlock(&tomoyo_query_list_lock); 2204 if (sscanf(data, "A%u=%u", &serial, &answer) != 2) 2205 return -EINVAL; 2206 spin_lock(&tomoyo_query_list_lock); 2207 list_for_each(tmp, &tomoyo_query_list) { 2208 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2209 if (ptr->serial != serial) 2210 continue; 2211 if (!ptr->answer) 2212 ptr->answer = answer; 2213 break; 2214 } 2215 spin_unlock(&tomoyo_query_list_lock); 2216 return 0; 2217} 2218 2219/** 2220 * tomoyo_read_version: Get version. 2221 * 2222 * @head: Pointer to "struct tomoyo_io_buffer". 2223 * 2224 * Returns version information. 2225 */ 2226static void tomoyo_read_version(struct tomoyo_io_buffer *head) 2227{ 2228 if (!head->r.eof) { 2229 tomoyo_io_printf(head, "2.5.0"); 2230 head->r.eof = true; 2231 } 2232} 2233 2234/* String table for /sys/kernel/security/tomoyo/stat interface. */ 2235static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = { 2236 [TOMOYO_STAT_POLICY_UPDATES] = "update:", 2237 [TOMOYO_STAT_POLICY_LEARNING] = "violation in learning mode:", 2238 [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:", 2239 [TOMOYO_STAT_POLICY_ENFORCING] = "violation in enforcing mode:", 2240}; 2241 2242/* String table for /sys/kernel/security/tomoyo/stat interface. */ 2243static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = { 2244 [TOMOYO_MEMORY_POLICY] = "policy:", 2245 [TOMOYO_MEMORY_AUDIT] = "audit log:", 2246 [TOMOYO_MEMORY_QUERY] = "query message:", 2247}; 2248 2249/* Timestamp counter for last updated. */ 2250static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT]; 2251/* Counter for number of updates. */ 2252static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT]; 2253 2254/** 2255 * tomoyo_update_stat - Update statistic counters. 2256 * 2257 * @index: Index for policy type. 2258 * 2259 * Returns nothing. 2260 */ 2261void tomoyo_update_stat(const u8 index) 2262{ 2263 struct timeval tv; 2264 do_gettimeofday(&tv); 2265 /* 2266 * I don't use atomic operations because race condition is not fatal. 2267 */ 2268 tomoyo_stat_updated[index]++; 2269 tomoyo_stat_modified[index] = tv.tv_sec; 2270} 2271 2272/** 2273 * tomoyo_read_stat - Read statistic data. 2274 * 2275 * @head: Pointer to "struct tomoyo_io_buffer". 2276 * 2277 * Returns nothing. 2278 */ 2279static void tomoyo_read_stat(struct tomoyo_io_buffer *head) 2280{ 2281 u8 i; 2282 unsigned int total = 0; 2283 if (head->r.eof) 2284 return; 2285 for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) { 2286 tomoyo_io_printf(head, "Policy %-30s %10u", 2287 tomoyo_policy_headers[i], 2288 tomoyo_stat_updated[i]); 2289 if (tomoyo_stat_modified[i]) { 2290 struct tomoyo_time stamp; 2291 tomoyo_convert_time(tomoyo_stat_modified[i], &stamp); 2292 tomoyo_io_printf(head, " (Last: %04u/%02u/%02u " 2293 "%02u:%02u:%02u)", 2294 stamp.year, stamp.month, stamp.day, 2295 stamp.hour, stamp.min, stamp.sec); 2296 } 2297 tomoyo_set_lf(head); 2298 } 2299 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) { 2300 unsigned int used = tomoyo_memory_used[i]; 2301 total += used; 2302 tomoyo_io_printf(head, "Memory used by %-22s %10u", 2303 tomoyo_memory_headers[i], used); 2304 used = tomoyo_memory_quota[i]; 2305 if (used) 2306 tomoyo_io_printf(head, " (Quota: %10u)", used); 2307 tomoyo_set_lf(head); 2308 } 2309 tomoyo_io_printf(head, "Total memory used: %10u\n", 2310 total); 2311 head->r.eof = true; 2312} 2313 2314/** 2315 * tomoyo_write_stat - Set memory quota. 2316 * 2317 * @head: Pointer to "struct tomoyo_io_buffer". 2318 * 2319 * Returns 0. 2320 */ 2321static int tomoyo_write_stat(struct tomoyo_io_buffer *head) 2322{ 2323 char *data = head->write_buf; 2324 u8 i; 2325 if (tomoyo_str_starts(&data, "Memory used by ")) 2326 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) 2327 if (tomoyo_str_starts(&data, tomoyo_memory_headers[i])) 2328 sscanf(data, "%u", &tomoyo_memory_quota[i]); 2329 return 0; 2330} 2331 2332/** 2333 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. 2334 * 2335 * @type: Type of interface. 2336 * @file: Pointer to "struct file". 2337 * 2338 * Returns 0 on success, negative value otherwise. 2339 */ 2340int tomoyo_open_control(const u8 type, struct file *file) 2341{ 2342 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS); 2343 2344 if (!head) 2345 return -ENOMEM; 2346 mutex_init(&head->io_sem); 2347 head->type = type; 2348 switch (type) { 2349 case TOMOYO_DOMAINPOLICY: 2350 /* /sys/kernel/security/tomoyo/domain_policy */ 2351 head->write = tomoyo_write_domain; 2352 head->read = tomoyo_read_domain; 2353 break; 2354 case TOMOYO_EXCEPTIONPOLICY: 2355 /* /sys/kernel/security/tomoyo/exception_policy */ 2356 head->write = tomoyo_write_exception; 2357 head->read = tomoyo_read_exception; 2358 break; 2359 case TOMOYO_AUDIT: 2360 /* /sys/kernel/security/tomoyo/audit */ 2361 head->poll = tomoyo_poll_log; 2362 head->read = tomoyo_read_log; 2363 break; 2364 case TOMOYO_PROCESS_STATUS: 2365 /* /sys/kernel/security/tomoyo/.process_status */ 2366 head->write = tomoyo_write_pid; 2367 head->read = tomoyo_read_pid; 2368 break; 2369 case TOMOYO_VERSION: 2370 /* /sys/kernel/security/tomoyo/version */ 2371 head->read = tomoyo_read_version; 2372 head->readbuf_size = 128; 2373 break; 2374 case TOMOYO_STAT: 2375 /* /sys/kernel/security/tomoyo/stat */ 2376 head->write = tomoyo_write_stat; 2377 head->read = tomoyo_read_stat; 2378 head->readbuf_size = 1024; 2379 break; 2380 case TOMOYO_PROFILE: 2381 /* /sys/kernel/security/tomoyo/profile */ 2382 head->write = tomoyo_write_profile; 2383 head->read = tomoyo_read_profile; 2384 break; 2385 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */ 2386 head->poll = tomoyo_poll_query; 2387 head->write = tomoyo_write_answer; 2388 head->read = tomoyo_read_query; 2389 break; 2390 case TOMOYO_MANAGER: 2391 /* /sys/kernel/security/tomoyo/manager */ 2392 head->write = tomoyo_write_manager; 2393 head->read = tomoyo_read_manager; 2394 break; 2395 } 2396 if (!(file->f_mode & FMODE_READ)) { 2397 /* 2398 * No need to allocate read_buf since it is not opened 2399 * for reading. 2400 */ 2401 head->read = NULL; 2402 head->poll = NULL; 2403 } else if (!head->poll) { 2404 /* Don't allocate read_buf for poll() access. */ 2405 if (!head->readbuf_size) 2406 head->readbuf_size = 4096 * 2; 2407 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS); 2408 if (!head->read_buf) { 2409 kfree(head); 2410 return -ENOMEM; 2411 } 2412 } 2413 if (!(file->f_mode & FMODE_WRITE)) { 2414 /* 2415 * No need to allocate write_buf since it is not opened 2416 * for writing. 2417 */ 2418 head->write = NULL; 2419 } else if (head->write) { 2420 head->writebuf_size = 4096 * 2; 2421 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS); 2422 if (!head->write_buf) { 2423 kfree(head->read_buf); 2424 kfree(head); 2425 return -ENOMEM; 2426 } 2427 } 2428 /* 2429 * If the file is /sys/kernel/security/tomoyo/query , increment the 2430 * observer counter. 2431 * The obserber counter is used by tomoyo_supervisor() to see if 2432 * there is some process monitoring /sys/kernel/security/tomoyo/query. 2433 */ 2434 if (type == TOMOYO_QUERY) 2435 atomic_inc(&tomoyo_query_observers); 2436 file->private_data = head; 2437 tomoyo_notify_gc(head, true); 2438 return 0; 2439} 2440 2441/** 2442 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface. 2443 * 2444 * @file: Pointer to "struct file". 2445 * @wait: Pointer to "poll_table". 2446 * 2447 * Waits for read readiness. 2448 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and 2449 * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd. 2450 */ 2451int tomoyo_poll_control(struct file *file, poll_table *wait) 2452{ 2453 struct tomoyo_io_buffer *head = file->private_data; 2454 if (!head->poll) 2455 return -ENOSYS; 2456 return head->poll(file, wait); 2457} 2458 2459/** 2460 * tomoyo_set_namespace_cursor - Set namespace to read. 2461 * 2462 * @head: Pointer to "struct tomoyo_io_buffer". 2463 * 2464 * Returns nothing. 2465 */ 2466static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head) 2467{ 2468 struct list_head *ns; 2469 if (head->type != TOMOYO_EXCEPTIONPOLICY && 2470 head->type != TOMOYO_PROFILE) 2471 return; 2472 /* 2473 * If this is the first read, or reading previous namespace finished 2474 * and has more namespaces to read, update the namespace cursor. 2475 */ 2476 ns = head->r.ns; 2477 if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) { 2478 /* Clearing is OK because tomoyo_flush() returned true. */ 2479 memset(&head->r, 0, sizeof(head->r)); 2480 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next; 2481 } 2482} 2483 2484/** 2485 * tomoyo_has_more_namespace - Check for unread namespaces. 2486 * 2487 * @head: Pointer to "struct tomoyo_io_buffer". 2488 * 2489 * Returns true if we have more entries to print, false otherwise. 2490 */ 2491static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head) 2492{ 2493 return (head->type == TOMOYO_EXCEPTIONPOLICY || 2494 head->type == TOMOYO_PROFILE) && head->r.eof && 2495 head->r.ns->next != &tomoyo_namespace_list; 2496} 2497 2498/** 2499 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. 2500 * 2501 * @head: Pointer to "struct tomoyo_io_buffer". 2502 * @buffer: Poiner to buffer to write to. 2503 * @buffer_len: Size of @buffer. 2504 * 2505 * Returns bytes read on success, negative value otherwise. 2506 */ 2507ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer, 2508 const int buffer_len) 2509{ 2510 int len; 2511 int idx; 2512 2513 if (!head->read) 2514 return -ENOSYS; 2515 if (mutex_lock_interruptible(&head->io_sem)) 2516 return -EINTR; 2517 head->read_user_buf = buffer; 2518 head->read_user_buf_avail = buffer_len; 2519 idx = tomoyo_read_lock(); 2520 if (tomoyo_flush(head)) 2521 /* Call the policy handler. */ 2522 do { 2523 tomoyo_set_namespace_cursor(head); 2524 head->read(head); 2525 } while (tomoyo_flush(head) && 2526 tomoyo_has_more_namespace(head)); 2527 tomoyo_read_unlock(idx); 2528 len = head->read_user_buf - buffer; 2529 mutex_unlock(&head->io_sem); 2530 return len; 2531} 2532 2533/** 2534 * tomoyo_parse_policy - Parse a policy line. 2535 * 2536 * @head: Poiter to "struct tomoyo_io_buffer". 2537 * @line: Line to parse. 2538 * 2539 * Returns 0 on success, negative value otherwise. 2540 * 2541 * Caller holds tomoyo_read_lock(). 2542 */ 2543static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line) 2544{ 2545 /* Delete request? */ 2546 head->w.is_delete = !strncmp(line, "delete ", 7); 2547 if (head->w.is_delete) 2548 memmove(line, line + 7, strlen(line + 7) + 1); 2549 /* Selecting namespace to update. */ 2550 if (head->type == TOMOYO_EXCEPTIONPOLICY || 2551 head->type == TOMOYO_PROFILE) { 2552 if (*line == '<') { 2553 char *cp = strchr(line, ' '); 2554 if (cp) { 2555 *cp++ = '\0'; 2556 head->w.ns = tomoyo_assign_namespace(line); 2557 memmove(line, cp, strlen(cp) + 1); 2558 } else 2559 head->w.ns = NULL; 2560 } else 2561 head->w.ns = &tomoyo_kernel_namespace; 2562 /* Don't allow updating if namespace is invalid. */ 2563 if (!head->w.ns) 2564 return -ENOENT; 2565 } 2566 /* Do the update. */ 2567 return head->write(head); 2568} 2569 2570/** 2571 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. 2572 * 2573 * @head: Pointer to "struct tomoyo_io_buffer". 2574 * @buffer: Pointer to buffer to read from. 2575 * @buffer_len: Size of @buffer. 2576 * 2577 * Returns @buffer_len on success, negative value otherwise. 2578 */ 2579ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head, 2580 const char __user *buffer, const int buffer_len) 2581{ 2582 int error = buffer_len; 2583 size_t avail_len = buffer_len; 2584 char *cp0 = head->write_buf; 2585 int idx; 2586 if (!head->write) 2587 return -ENOSYS; 2588 if (!access_ok(VERIFY_READ, buffer, buffer_len)) 2589 return -EFAULT; 2590 if (mutex_lock_interruptible(&head->io_sem)) 2591 return -EINTR; 2592 idx = tomoyo_read_lock(); 2593 /* Read a line and dispatch it to the policy handler. */ 2594 while (avail_len > 0) { 2595 char c; 2596 if (head->w.avail >= head->writebuf_size - 1) { 2597 const int len = head->writebuf_size * 2; 2598 char *cp = kzalloc(len, GFP_NOFS); 2599 if (!cp) { 2600 error = -ENOMEM; 2601 break; 2602 } 2603 memmove(cp, cp0, head->w.avail); 2604 kfree(cp0); 2605 head->write_buf = cp; 2606 cp0 = cp; 2607 head->writebuf_size = len; 2608 } 2609 if (get_user(c, buffer)) { 2610 error = -EFAULT; 2611 break; 2612 } 2613 buffer++; 2614 avail_len--; 2615 cp0[head->w.avail++] = c; 2616 if (c != '\n') 2617 continue; 2618 cp0[head->w.avail - 1] = '\0'; 2619 head->w.avail = 0; 2620 tomoyo_normalize_line(cp0); 2621 if (!strcmp(cp0, "reset")) { 2622 head->w.ns = &tomoyo_kernel_namespace; 2623 head->w.domain = NULL; 2624 memset(&head->r, 0, sizeof(head->r)); 2625 continue; 2626 } 2627 /* Don't allow updating policies by non manager programs. */ 2628 switch (head->type) { 2629 case TOMOYO_PROCESS_STATUS: 2630 /* This does not write anything. */ 2631 break; 2632 case TOMOYO_DOMAINPOLICY: 2633 if (tomoyo_select_domain(head, cp0)) 2634 continue; 2635 /* fall through */ 2636 case TOMOYO_EXCEPTIONPOLICY: 2637 if (!strcmp(cp0, "select transition_only")) { 2638 head->r.print_transition_related_only = true; 2639 continue; 2640 } 2641 /* fall through */ 2642 default: 2643 if (!tomoyo_manager()) { 2644 error = -EPERM; 2645 goto out; 2646 } 2647 } 2648 switch (tomoyo_parse_policy(head, cp0)) { 2649 case -EPERM: 2650 error = -EPERM; 2651 goto out; 2652 case 0: 2653 switch (head->type) { 2654 case TOMOYO_DOMAINPOLICY: 2655 case TOMOYO_EXCEPTIONPOLICY: 2656 case TOMOYO_STAT: 2657 case TOMOYO_PROFILE: 2658 case TOMOYO_MANAGER: 2659 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES); 2660 break; 2661 default: 2662 break; 2663 } 2664 break; 2665 } 2666 } 2667out: 2668 tomoyo_read_unlock(idx); 2669 mutex_unlock(&head->io_sem); 2670 return error; 2671} 2672 2673/** 2674 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. 2675 * 2676 * @head: Pointer to "struct tomoyo_io_buffer". 2677 * 2678 * Returns 0. 2679 */ 2680int tomoyo_close_control(struct tomoyo_io_buffer *head) 2681{ 2682 /* 2683 * If the file is /sys/kernel/security/tomoyo/query , decrement the 2684 * observer counter. 2685 */ 2686 if (head->type == TOMOYO_QUERY && 2687 atomic_dec_and_test(&tomoyo_query_observers)) 2688 wake_up_all(&tomoyo_answer_wait); 2689 tomoyo_notify_gc(head, false); 2690 return 0; 2691} 2692 2693/** 2694 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined. 2695 */ 2696void tomoyo_check_profile(void) 2697{ 2698 struct tomoyo_domain_info *domain; 2699 const int idx = tomoyo_read_lock(); 2700 tomoyo_policy_loaded = true; 2701 printk(KERN_INFO "TOMOYO: 2.5.0\n"); 2702 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 2703 const u8 profile = domain->profile; 2704 const struct tomoyo_policy_namespace *ns = domain->ns; 2705 if (ns->profile_version != 20110903) 2706 printk(KERN_ERR 2707 "Profile version %u is not supported.\n", 2708 ns->profile_version); 2709 else if (!ns->profile_ptr[profile]) 2710 printk(KERN_ERR 2711 "Profile %u (used by '%s') is not defined.\n", 2712 profile, domain->domainname->name); 2713 else 2714 continue; 2715 printk(KERN_ERR 2716 "Userland tools for TOMOYO 2.5 must be installed and " 2717 "policy must be initialized.\n"); 2718 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ " 2719 "for more information.\n"); 2720 panic("STOP!"); 2721 } 2722 tomoyo_read_unlock(idx); 2723 printk(KERN_INFO "Mandatory Access Control activated.\n"); 2724} 2725 2726/** 2727 * tomoyo_load_builtin_policy - Load built-in policy. 2728 * 2729 * Returns nothing. 2730 */ 2731void __init tomoyo_load_builtin_policy(void) 2732{ 2733 /* 2734 * This include file is manually created and contains built-in policy 2735 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy", 2736 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager", 2737 * "tomoyo_builtin_stat" in the form of "static char [] __initdata". 2738 */ 2739#include "builtin-policy.h" 2740 u8 i; 2741 const int idx = tomoyo_read_lock(); 2742 for (i = 0; i < 5; i++) { 2743 struct tomoyo_io_buffer head = { }; 2744 char *start = ""; 2745 switch (i) { 2746 case 0: 2747 start = tomoyo_builtin_profile; 2748 head.type = TOMOYO_PROFILE; 2749 head.write = tomoyo_write_profile; 2750 break; 2751 case 1: 2752 start = tomoyo_builtin_exception_policy; 2753 head.type = TOMOYO_EXCEPTIONPOLICY; 2754 head.write = tomoyo_write_exception; 2755 break; 2756 case 2: 2757 start = tomoyo_builtin_domain_policy; 2758 head.type = TOMOYO_DOMAINPOLICY; 2759 head.write = tomoyo_write_domain; 2760 break; 2761 case 3: 2762 start = tomoyo_builtin_manager; 2763 head.type = TOMOYO_MANAGER; 2764 head.write = tomoyo_write_manager; 2765 break; 2766 case 4: 2767 start = tomoyo_builtin_stat; 2768 head.type = TOMOYO_STAT; 2769 head.write = tomoyo_write_stat; 2770 break; 2771 } 2772 while (1) { 2773 char *end = strchr(start, '\n'); 2774 if (!end) 2775 break; 2776 *end = '\0'; 2777 tomoyo_normalize_line(start); 2778 head.write_buf = start; 2779 tomoyo_parse_policy(&head, start); 2780 start = end + 1; 2781 } 2782 } 2783 tomoyo_read_unlock(idx); 2784#ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER 2785 tomoyo_check_profile(); 2786#endif 2787} 2788