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. */ 13 const 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 */ 21 const 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. */ 72 const 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. */ 135 static 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. */ 141 const 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. */ 156 const 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. */ 164 static 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? */ 172 static 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 */ 181 const 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 */ 195 static 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 */ 211 static 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 */ 256 static 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 } 264 265 static 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 */ 274 static 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 */ 301 static 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 */ 313 static 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 */ 326 static void tomoyo_set_slash(struct tomoyo_io_buffer *head) 327 { 328 tomoyo_set_string(head, "/"); 329 } 330 331 /* List of namespaces. */ 332 LIST_HEAD(tomoyo_namespace_list); 333 /* True if namespace other than tomoyo_kernel_namespace is defined. */ 334 static 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 */ 343 void 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 */ 364 static 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 */ 381 static 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 */ 401 static 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 */ 422 static 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 */ 469 static 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 */ 484 static 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] = 506 CONFIG_SECURITY_TOMOYO_MAX_AUDIT_LOG; 507 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] = 508 CONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY; 509 mb(); /* Avoid out-of-order execution. */ 510 ns->profile_ptr[profile] = ptr; 511 entry = NULL; 512 } 513 mutex_unlock(&tomoyo_policy_lock); 514 out: 515 kfree(entry); 516 return ptr; 517 } 518 519 /** 520 * tomoyo_profile - Find a profile. 521 * 522 * @ns: Pointer to "struct tomoyo_policy_namespace". 523 * @profile: Profile number to find. 524 * 525 * Returns pointer to "struct tomoyo_profile". 526 */ 527 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns, 528 const u8 profile) 529 { 530 static struct tomoyo_profile tomoyo_null_profile; 531 struct tomoyo_profile *ptr = ns->profile_ptr[profile]; 532 if (!ptr) 533 ptr = &tomoyo_null_profile; 534 return ptr; 535 } 536 537 /** 538 * tomoyo_find_yesno - Find values for specified keyword. 539 * 540 * @string: String to check. 541 * @find: Name of keyword. 542 * 543 * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise. 544 */ 545 static s8 tomoyo_find_yesno(const char *string, const char *find) 546 { 547 const char *cp = strstr(string, find); 548 if (cp) { 549 cp += strlen(find); 550 if (!strncmp(cp, "=yes", 4)) 551 return 1; 552 else if (!strncmp(cp, "=no", 3)) 553 return 0; 554 } 555 return -1; 556 } 557 558 /** 559 * tomoyo_set_uint - Set value for specified preference. 560 * 561 * @i: Pointer to "unsigned int". 562 * @string: String to check. 563 * @find: Name of keyword. 564 * 565 * Returns nothing. 566 */ 567 static void tomoyo_set_uint(unsigned int *i, const char *string, 568 const char *find) 569 { 570 const char *cp = strstr(string, find); 571 if (cp) 572 sscanf(cp + strlen(find), "=%u", i); 573 } 574 575 /** 576 * tomoyo_set_mode - Set mode for specified profile. 577 * 578 * @name: Name of functionality. 579 * @value: Mode for @name. 580 * @profile: Pointer to "struct tomoyo_profile". 581 * 582 * Returns 0 on success, negative value otherwise. 583 */ 584 static int tomoyo_set_mode(char *name, const char *value, 585 struct tomoyo_profile *profile) 586 { 587 u8 i; 588 u8 config; 589 if (!strcmp(name, "CONFIG")) { 590 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX; 591 config = profile->default_config; 592 } else if (tomoyo_str_starts(&name, "CONFIG::")) { 593 config = 0; 594 for (i = 0; i < TOMOYO_MAX_MAC_INDEX 595 + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) { 596 int len = 0; 597 if (i < TOMOYO_MAX_MAC_INDEX) { 598 const u8 c = tomoyo_index2category[i]; 599 const char *category = 600 tomoyo_category_keywords[c]; 601 len = strlen(category); 602 if (strncmp(name, category, len) || 603 name[len++] != ':' || name[len++] != ':') 604 continue; 605 } 606 if (strcmp(name + len, tomoyo_mac_keywords[i])) 607 continue; 608 config = profile->config[i]; 609 break; 610 } 611 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX) 612 return -EINVAL; 613 } else { 614 return -EINVAL; 615 } 616 if (strstr(value, "use_default")) { 617 config = TOMOYO_CONFIG_USE_DEFAULT; 618 } else { 619 u8 mode; 620 for (mode = 0; mode < 4; mode++) 621 if (strstr(value, tomoyo_mode[mode])) 622 /* 623 * Update lower 3 bits in order to distinguish 624 * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'. 625 */ 626 config = (config & ~7) | mode; 627 if (config != TOMOYO_CONFIG_USE_DEFAULT) { 628 switch (tomoyo_find_yesno(value, "grant_log")) { 629 case 1: 630 config |= TOMOYO_CONFIG_WANT_GRANT_LOG; 631 break; 632 case 0: 633 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG; 634 break; 635 } 636 switch (tomoyo_find_yesno(value, "reject_log")) { 637 case 1: 638 config |= TOMOYO_CONFIG_WANT_REJECT_LOG; 639 break; 640 case 0: 641 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG; 642 break; 643 } 644 } 645 } 646 if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX) 647 profile->config[i] = config; 648 else if (config != TOMOYO_CONFIG_USE_DEFAULT) 649 profile->default_config = config; 650 return 0; 651 } 652 653 /** 654 * tomoyo_write_profile - Write profile table. 655 * 656 * @head: Pointer to "struct tomoyo_io_buffer". 657 * 658 * Returns 0 on success, negative value otherwise. 659 */ 660 static int tomoyo_write_profile(struct tomoyo_io_buffer *head) 661 { 662 char *data = head->write_buf; 663 unsigned int i; 664 char *cp; 665 struct tomoyo_profile *profile; 666 if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version) 667 == 1) 668 return 0; 669 i = simple_strtoul(data, &cp, 10); 670 if (*cp != '-') 671 return -EINVAL; 672 data = cp + 1; 673 profile = tomoyo_assign_profile(head->w.ns, i); 674 if (!profile) 675 return -EINVAL; 676 cp = strchr(data, '='); 677 if (!cp) 678 return -EINVAL; 679 *cp++ = '\0'; 680 if (!strcmp(data, "COMMENT")) { 681 static DEFINE_SPINLOCK(lock); 682 const struct tomoyo_path_info *new_comment 683 = tomoyo_get_name(cp); 684 const struct tomoyo_path_info *old_comment; 685 if (!new_comment) 686 return -ENOMEM; 687 spin_lock(&lock); 688 old_comment = profile->comment; 689 profile->comment = new_comment; 690 spin_unlock(&lock); 691 tomoyo_put_name(old_comment); 692 return 0; 693 } 694 if (!strcmp(data, "PREFERENCE")) { 695 for (i = 0; i < TOMOYO_MAX_PREF; i++) 696 tomoyo_set_uint(&profile->pref[i], cp, 697 tomoyo_pref_keywords[i]); 698 return 0; 699 } 700 return tomoyo_set_mode(data, cp, profile); 701 } 702 703 /** 704 * tomoyo_print_config - Print mode for specified functionality. 705 * 706 * @head: Pointer to "struct tomoyo_io_buffer". 707 * @config: Mode for that functionality. 708 * 709 * Returns nothing. 710 * 711 * Caller prints functionality's name. 712 */ 713 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config) 714 { 715 tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n", 716 tomoyo_mode[config & 3], 717 tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG), 718 tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG)); 719 } 720 721 /** 722 * tomoyo_read_profile - Read profile table. 723 * 724 * @head: Pointer to "struct tomoyo_io_buffer". 725 * 726 * Returns nothing. 727 */ 728 static void tomoyo_read_profile(struct tomoyo_io_buffer *head) 729 { 730 u8 index; 731 struct tomoyo_policy_namespace *ns = 732 container_of(head->r.ns, typeof(*ns), namespace_list); 733 const struct tomoyo_profile *profile; 734 if (head->r.eof) 735 return; 736 next: 737 index = head->r.index; 738 profile = ns->profile_ptr[index]; 739 switch (head->r.step) { 740 case 0: 741 tomoyo_print_namespace(head); 742 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n", 743 ns->profile_version); 744 head->r.step++; 745 break; 746 case 1: 747 for ( ; head->r.index < TOMOYO_MAX_PROFILES; 748 head->r.index++) 749 if (ns->profile_ptr[head->r.index]) 750 break; 751 if (head->r.index == TOMOYO_MAX_PROFILES) { 752 head->r.eof = true; 753 return; 754 } 755 head->r.step++; 756 break; 757 case 2: 758 { 759 u8 i; 760 const struct tomoyo_path_info *comment = 761 profile->comment; 762 tomoyo_print_namespace(head); 763 tomoyo_io_printf(head, "%u-COMMENT=", index); 764 tomoyo_set_string(head, comment ? comment->name : ""); 765 tomoyo_set_lf(head); 766 tomoyo_print_namespace(head); 767 tomoyo_io_printf(head, "%u-PREFERENCE={ ", index); 768 for (i = 0; i < TOMOYO_MAX_PREF; i++) 769 tomoyo_io_printf(head, "%s=%u ", 770 tomoyo_pref_keywords[i], 771 profile->pref[i]); 772 tomoyo_set_string(head, "}\n"); 773 head->r.step++; 774 } 775 break; 776 case 3: 777 { 778 tomoyo_print_namespace(head); 779 tomoyo_io_printf(head, "%u-%s", index, "CONFIG"); 780 tomoyo_print_config(head, profile->default_config); 781 head->r.bit = 0; 782 head->r.step++; 783 } 784 break; 785 case 4: 786 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX 787 + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) { 788 const u8 i = head->r.bit; 789 const u8 config = profile->config[i]; 790 if (config == TOMOYO_CONFIG_USE_DEFAULT) 791 continue; 792 tomoyo_print_namespace(head); 793 if (i < TOMOYO_MAX_MAC_INDEX) 794 tomoyo_io_printf(head, "%u-CONFIG::%s::%s", 795 index, 796 tomoyo_category_keywords 797 [tomoyo_index2category[i]], 798 tomoyo_mac_keywords[i]); 799 else 800 tomoyo_io_printf(head, "%u-CONFIG::%s", index, 801 tomoyo_mac_keywords[i]); 802 tomoyo_print_config(head, config); 803 head->r.bit++; 804 break; 805 } 806 if (head->r.bit == TOMOYO_MAX_MAC_INDEX 807 + TOMOYO_MAX_MAC_CATEGORY_INDEX) { 808 head->r.index++; 809 head->r.step = 1; 810 } 811 break; 812 } 813 if (tomoyo_flush(head)) 814 goto next; 815 } 816 817 /** 818 * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry. 819 * 820 * @a: Pointer to "struct tomoyo_acl_head". 821 * @b: Pointer to "struct tomoyo_acl_head". 822 * 823 * Returns true if @a == @b, false otherwise. 824 */ 825 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a, 826 const struct tomoyo_acl_head *b) 827 { 828 return container_of(a, struct tomoyo_manager, head)->manager == 829 container_of(b, struct tomoyo_manager, head)->manager; 830 } 831 832 /** 833 * tomoyo_update_manager_entry - Add a manager entry. 834 * 835 * @manager: The path to manager or the domainnamme. 836 * @is_delete: True if it is a delete request. 837 * 838 * Returns 0 on success, negative value otherwise. 839 * 840 * Caller holds tomoyo_read_lock(). 841 */ 842 static int tomoyo_update_manager_entry(const char *manager, 843 const bool is_delete) 844 { 845 struct tomoyo_manager e = { }; 846 struct tomoyo_acl_param param = { 847 /* .ns = &tomoyo_kernel_namespace, */ 848 .is_delete = is_delete, 849 .list = &tomoyo_kernel_namespace. 850 policy_list[TOMOYO_ID_MANAGER], 851 }; 852 int error = is_delete ? -ENOENT : -ENOMEM; 853 if (!tomoyo_correct_domain(manager) && 854 !tomoyo_correct_word(manager)) 855 return -EINVAL; 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 */ 874 static 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 */ 892 static 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 */ 918 static 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 && 929 (!uid_eq(task->cred->uid, GLOBAL_ROOT_UID) || 930 !uid_eq(task->cred->euid, GLOBAL_ROOT_UID))) 931 return false; 932 exe = tomoyo_get_exe(); 933 if (!exe) 934 return false; 935 list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace. 936 policy_list[TOMOYO_ID_MANAGER], head.list) { 937 if (!ptr->head.is_deleted && 938 (!tomoyo_pathcmp(domainname, ptr->manager) || 939 !strcmp(exe, ptr->manager->name))) { 940 found = true; 941 break; 942 } 943 } 944 if (!found) { /* Reduce error messages. */ 945 static pid_t last_pid; 946 const pid_t pid = current->pid; 947 if (last_pid != pid) { 948 printk(KERN_WARNING "%s ( %s ) is not permitted to " 949 "update policies.\n", domainname->name, exe); 950 last_pid = pid; 951 } 952 } 953 kfree(exe); 954 return found; 955 } 956 957 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid 958 (unsigned int serial); 959 960 /** 961 * tomoyo_select_domain - Parse select command. 962 * 963 * @head: Pointer to "struct tomoyo_io_buffer". 964 * @data: String to parse. 965 * 966 * Returns true on success, false otherwise. 967 * 968 * Caller holds tomoyo_read_lock(). 969 */ 970 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head, 971 const char *data) 972 { 973 unsigned int pid; 974 struct tomoyo_domain_info *domain = NULL; 975 bool global_pid = false; 976 if (strncmp(data, "select ", 7)) 977 return false; 978 data += 7; 979 if (sscanf(data, "pid=%u", &pid) == 1 || 980 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { 981 struct task_struct *p; 982 rcu_read_lock(); 983 if (global_pid) 984 p = find_task_by_pid_ns(pid, &init_pid_ns); 985 else 986 p = find_task_by_vpid(pid); 987 if (p) 988 domain = tomoyo_real_domain(p); 989 rcu_read_unlock(); 990 } else if (!strncmp(data, "domain=", 7)) { 991 if (tomoyo_domain_def(data + 7)) 992 domain = tomoyo_find_domain(data + 7); 993 } else if (sscanf(data, "Q=%u", &pid) == 1) { 994 domain = tomoyo_find_domain_by_qid(pid); 995 } else 996 return false; 997 head->w.domain = domain; 998 /* Accessing read_buf is safe because head->io_sem is held. */ 999 if (!head->read_buf) 1000 return true; /* Do nothing if open(O_WRONLY). */ 1001 memset(&head->r, 0, sizeof(head->r)); 1002 head->r.print_this_domain_only = true; 1003 if (domain) 1004 head->r.domain = &domain->list; 1005 else 1006 head->r.eof = 1; 1007 tomoyo_io_printf(head, "# select %s\n", data); 1008 if (domain && domain->is_deleted) 1009 tomoyo_io_printf(head, "# This is a deleted domain.\n"); 1010 return true; 1011 } 1012 1013 /** 1014 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry. 1015 * 1016 * @a: Pointer to "struct tomoyo_acl_info". 1017 * @b: Pointer to "struct tomoyo_acl_info". 1018 * 1019 * Returns true if @a == @b, false otherwise. 1020 */ 1021 static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a, 1022 const struct tomoyo_acl_info *b) 1023 { 1024 const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head); 1025 const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head); 1026 return p1->domainname == p2->domainname; 1027 } 1028 1029 /** 1030 * tomoyo_write_task - Update task related list. 1031 * 1032 * @param: Pointer to "struct tomoyo_acl_param". 1033 * 1034 * Returns 0 on success, negative value otherwise. 1035 * 1036 * Caller holds tomoyo_read_lock(). 1037 */ 1038 static int tomoyo_write_task(struct tomoyo_acl_param *param) 1039 { 1040 int error = -EINVAL; 1041 if (tomoyo_str_starts(¶m->data, "manual_domain_transition ")) { 1042 struct tomoyo_task_acl e = { 1043 .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL, 1044 .domainname = tomoyo_get_domainname(param), 1045 }; 1046 if (e.domainname) 1047 error = tomoyo_update_domain(&e.head, sizeof(e), param, 1048 tomoyo_same_task_acl, 1049 NULL); 1050 tomoyo_put_name(e.domainname); 1051 } 1052 return error; 1053 } 1054 1055 /** 1056 * tomoyo_delete_domain - Delete a domain. 1057 * 1058 * @domainname: The name of domain. 1059 * 1060 * Returns 0 on success, negative value otherwise. 1061 * 1062 * Caller holds tomoyo_read_lock(). 1063 */ 1064 static int tomoyo_delete_domain(char *domainname) 1065 { 1066 struct tomoyo_domain_info *domain; 1067 struct tomoyo_path_info name; 1068 1069 name.name = domainname; 1070 tomoyo_fill_path_info(&name); 1071 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 1072 return -EINTR; 1073 /* Is there an active domain? */ 1074 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 1075 /* Never delete tomoyo_kernel_domain */ 1076 if (domain == &tomoyo_kernel_domain) 1077 continue; 1078 if (domain->is_deleted || 1079 tomoyo_pathcmp(domain->domainname, &name)) 1080 continue; 1081 domain->is_deleted = true; 1082 break; 1083 } 1084 mutex_unlock(&tomoyo_policy_lock); 1085 return 0; 1086 } 1087 1088 /** 1089 * tomoyo_write_domain2 - Write domain policy. 1090 * 1091 * @ns: Pointer to "struct tomoyo_policy_namespace". 1092 * @list: Pointer to "struct list_head". 1093 * @data: Policy to be interpreted. 1094 * @is_delete: True if it is a delete request. 1095 * 1096 * Returns 0 on success, negative value otherwise. 1097 * 1098 * Caller holds tomoyo_read_lock(). 1099 */ 1100 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns, 1101 struct list_head *list, char *data, 1102 const bool is_delete) 1103 { 1104 struct tomoyo_acl_param param = { 1105 .ns = ns, 1106 .list = list, 1107 .data = data, 1108 .is_delete = is_delete, 1109 }; 1110 static const struct { 1111 const char *keyword; 1112 int (*write) (struct tomoyo_acl_param *); 1113 } tomoyo_callback[5] = { 1114 { "file ", tomoyo_write_file }, 1115 { "network inet ", tomoyo_write_inet_network }, 1116 { "network unix ", tomoyo_write_unix_network }, 1117 { "misc ", tomoyo_write_misc }, 1118 { "task ", tomoyo_write_task }, 1119 }; 1120 u8 i; 1121 1122 for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) { 1123 if (!tomoyo_str_starts(¶m.data, 1124 tomoyo_callback[i].keyword)) 1125 continue; 1126 return tomoyo_callback[i].write(¶m); 1127 } 1128 return -EINVAL; 1129 } 1130 1131 /* String table for domain flags. */ 1132 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = { 1133 [TOMOYO_DIF_QUOTA_WARNED] = "quota_exceeded\n", 1134 [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n", 1135 }; 1136 1137 /** 1138 * tomoyo_write_domain - Write domain policy. 1139 * 1140 * @head: Pointer to "struct tomoyo_io_buffer". 1141 * 1142 * Returns 0 on success, negative value otherwise. 1143 * 1144 * Caller holds tomoyo_read_lock(). 1145 */ 1146 static int tomoyo_write_domain(struct tomoyo_io_buffer *head) 1147 { 1148 char *data = head->write_buf; 1149 struct tomoyo_policy_namespace *ns; 1150 struct tomoyo_domain_info *domain = head->w.domain; 1151 const bool is_delete = head->w.is_delete; 1152 bool is_select = !is_delete && tomoyo_str_starts(&data, "select "); 1153 unsigned int profile; 1154 if (*data == '<') { 1155 int ret = 0; 1156 domain = NULL; 1157 if (is_delete) 1158 ret = tomoyo_delete_domain(data); 1159 else if (is_select) 1160 domain = tomoyo_find_domain(data); 1161 else 1162 domain = tomoyo_assign_domain(data, false); 1163 head->w.domain = domain; 1164 return ret; 1165 } 1166 if (!domain) 1167 return -EINVAL; 1168 ns = domain->ns; 1169 if (sscanf(data, "use_profile %u", &profile) == 1 1170 && profile < TOMOYO_MAX_PROFILES) { 1171 if (!tomoyo_policy_loaded || ns->profile_ptr[profile]) 1172 domain->profile = (u8) profile; 1173 return 0; 1174 } 1175 if (sscanf(data, "use_group %u\n", &profile) == 1 1176 && profile < TOMOYO_MAX_ACL_GROUPS) { 1177 if (!is_delete) 1178 domain->group = (u8) profile; 1179 return 0; 1180 } 1181 for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) { 1182 const char *cp = tomoyo_dif[profile]; 1183 if (strncmp(data, cp, strlen(cp) - 1)) 1184 continue; 1185 domain->flags[profile] = !is_delete; 1186 return 0; 1187 } 1188 return tomoyo_write_domain2(ns, &domain->acl_info_list, data, 1189 is_delete); 1190 } 1191 1192 /** 1193 * tomoyo_print_condition - Print condition part. 1194 * 1195 * @head: Pointer to "struct tomoyo_io_buffer". 1196 * @cond: Pointer to "struct tomoyo_condition". 1197 * 1198 * Returns true on success, false otherwise. 1199 */ 1200 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head, 1201 const struct tomoyo_condition *cond) 1202 { 1203 switch (head->r.cond_step) { 1204 case 0: 1205 head->r.cond_index = 0; 1206 head->r.cond_step++; 1207 if (cond->transit) { 1208 tomoyo_set_space(head); 1209 tomoyo_set_string(head, cond->transit->name); 1210 } 1211 /* fall through */ 1212 case 1: 1213 { 1214 const u16 condc = cond->condc; 1215 const struct tomoyo_condition_element *condp = 1216 (typeof(condp)) (cond + 1); 1217 const struct tomoyo_number_union *numbers_p = 1218 (typeof(numbers_p)) (condp + condc); 1219 const struct tomoyo_name_union *names_p = 1220 (typeof(names_p)) 1221 (numbers_p + cond->numbers_count); 1222 const struct tomoyo_argv *argv = 1223 (typeof(argv)) (names_p + cond->names_count); 1224 const struct tomoyo_envp *envp = 1225 (typeof(envp)) (argv + cond->argc); 1226 u16 skip; 1227 for (skip = 0; skip < head->r.cond_index; skip++) { 1228 const u8 left = condp->left; 1229 const u8 right = condp->right; 1230 condp++; 1231 switch (left) { 1232 case TOMOYO_ARGV_ENTRY: 1233 argv++; 1234 continue; 1235 case TOMOYO_ENVP_ENTRY: 1236 envp++; 1237 continue; 1238 case TOMOYO_NUMBER_UNION: 1239 numbers_p++; 1240 break; 1241 } 1242 switch (right) { 1243 case TOMOYO_NAME_UNION: 1244 names_p++; 1245 break; 1246 case TOMOYO_NUMBER_UNION: 1247 numbers_p++; 1248 break; 1249 } 1250 } 1251 while (head->r.cond_index < condc) { 1252 const u8 match = condp->equals; 1253 const u8 left = condp->left; 1254 const u8 right = condp->right; 1255 if (!tomoyo_flush(head)) 1256 return false; 1257 condp++; 1258 head->r.cond_index++; 1259 tomoyo_set_space(head); 1260 switch (left) { 1261 case TOMOYO_ARGV_ENTRY: 1262 tomoyo_io_printf(head, 1263 "exec.argv[%lu]%s=\"", 1264 argv->index, argv-> 1265 is_not ? "!" : ""); 1266 tomoyo_set_string(head, 1267 argv->value->name); 1268 tomoyo_set_string(head, "\""); 1269 argv++; 1270 continue; 1271 case TOMOYO_ENVP_ENTRY: 1272 tomoyo_set_string(head, 1273 "exec.envp[\""); 1274 tomoyo_set_string(head, 1275 envp->name->name); 1276 tomoyo_io_printf(head, "\"]%s=", envp-> 1277 is_not ? "!" : ""); 1278 if (envp->value) { 1279 tomoyo_set_string(head, "\""); 1280 tomoyo_set_string(head, envp-> 1281 value->name); 1282 tomoyo_set_string(head, "\""); 1283 } else { 1284 tomoyo_set_string(head, 1285 "NULL"); 1286 } 1287 envp++; 1288 continue; 1289 case TOMOYO_NUMBER_UNION: 1290 tomoyo_print_number_union_nospace 1291 (head, numbers_p++); 1292 break; 1293 default: 1294 tomoyo_set_string(head, 1295 tomoyo_condition_keyword[left]); 1296 break; 1297 } 1298 tomoyo_set_string(head, match ? "=" : "!="); 1299 switch (right) { 1300 case TOMOYO_NAME_UNION: 1301 tomoyo_print_name_union_quoted 1302 (head, names_p++); 1303 break; 1304 case TOMOYO_NUMBER_UNION: 1305 tomoyo_print_number_union_nospace 1306 (head, numbers_p++); 1307 break; 1308 default: 1309 tomoyo_set_string(head, 1310 tomoyo_condition_keyword[right]); 1311 break; 1312 } 1313 } 1314 } 1315 head->r.cond_step++; 1316 /* fall through */ 1317 case 2: 1318 if (!tomoyo_flush(head)) 1319 break; 1320 head->r.cond_step++; 1321 /* fall through */ 1322 case 3: 1323 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO) 1324 tomoyo_io_printf(head, " grant_log=%s", 1325 tomoyo_yesno(cond->grant_log == 1326 TOMOYO_GRANTLOG_YES)); 1327 tomoyo_set_lf(head); 1328 return true; 1329 } 1330 return false; 1331 } 1332 1333 /** 1334 * tomoyo_set_group - Print "acl_group " header keyword and category name. 1335 * 1336 * @head: Pointer to "struct tomoyo_io_buffer". 1337 * @category: Category name. 1338 * 1339 * Returns nothing. 1340 */ 1341 static void tomoyo_set_group(struct tomoyo_io_buffer *head, 1342 const char *category) 1343 { 1344 if (head->type == TOMOYO_EXCEPTIONPOLICY) { 1345 tomoyo_print_namespace(head); 1346 tomoyo_io_printf(head, "acl_group %u ", 1347 head->r.acl_group_index); 1348 } 1349 tomoyo_set_string(head, category); 1350 } 1351 1352 /** 1353 * tomoyo_print_entry - Print an ACL entry. 1354 * 1355 * @head: Pointer to "struct tomoyo_io_buffer". 1356 * @acl: Pointer to an ACL entry. 1357 * 1358 * Returns true on success, false otherwise. 1359 */ 1360 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, 1361 struct tomoyo_acl_info *acl) 1362 { 1363 const u8 acl_type = acl->type; 1364 bool first = true; 1365 u8 bit; 1366 1367 if (head->r.print_cond_part) 1368 goto print_cond_part; 1369 if (acl->is_deleted) 1370 return true; 1371 if (!tomoyo_flush(head)) 1372 return false; 1373 else if (acl_type == TOMOYO_TYPE_PATH_ACL) { 1374 struct tomoyo_path_acl *ptr = 1375 container_of(acl, typeof(*ptr), head); 1376 const u16 perm = ptr->perm; 1377 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { 1378 if (!(perm & (1 << bit))) 1379 continue; 1380 if (head->r.print_transition_related_only && 1381 bit != TOMOYO_TYPE_EXECUTE) 1382 continue; 1383 if (first) { 1384 tomoyo_set_group(head, "file "); 1385 first = false; 1386 } else { 1387 tomoyo_set_slash(head); 1388 } 1389 tomoyo_set_string(head, tomoyo_path_keyword[bit]); 1390 } 1391 if (first) 1392 return true; 1393 tomoyo_print_name_union(head, &ptr->name); 1394 } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) { 1395 struct tomoyo_task_acl *ptr = 1396 container_of(acl, typeof(*ptr), head); 1397 tomoyo_set_group(head, "task "); 1398 tomoyo_set_string(head, "manual_domain_transition "); 1399 tomoyo_set_string(head, ptr->domainname->name); 1400 } else if (head->r.print_transition_related_only) { 1401 return true; 1402 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) { 1403 struct tomoyo_path2_acl *ptr = 1404 container_of(acl, typeof(*ptr), head); 1405 const u8 perm = ptr->perm; 1406 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) { 1407 if (!(perm & (1 << bit))) 1408 continue; 1409 if (first) { 1410 tomoyo_set_group(head, "file "); 1411 first = false; 1412 } else { 1413 tomoyo_set_slash(head); 1414 } 1415 tomoyo_set_string(head, tomoyo_mac_keywords 1416 [tomoyo_pp2mac[bit]]); 1417 } 1418 if (first) 1419 return true; 1420 tomoyo_print_name_union(head, &ptr->name1); 1421 tomoyo_print_name_union(head, &ptr->name2); 1422 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) { 1423 struct tomoyo_path_number_acl *ptr = 1424 container_of(acl, typeof(*ptr), head); 1425 const u8 perm = ptr->perm; 1426 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) { 1427 if (!(perm & (1 << bit))) 1428 continue; 1429 if (first) { 1430 tomoyo_set_group(head, "file "); 1431 first = false; 1432 } else { 1433 tomoyo_set_slash(head); 1434 } 1435 tomoyo_set_string(head, tomoyo_mac_keywords 1436 [tomoyo_pn2mac[bit]]); 1437 } 1438 if (first) 1439 return true; 1440 tomoyo_print_name_union(head, &ptr->name); 1441 tomoyo_print_number_union(head, &ptr->number); 1442 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) { 1443 struct tomoyo_mkdev_acl *ptr = 1444 container_of(acl, typeof(*ptr), head); 1445 const u8 perm = ptr->perm; 1446 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) { 1447 if (!(perm & (1 << bit))) 1448 continue; 1449 if (first) { 1450 tomoyo_set_group(head, "file "); 1451 first = false; 1452 } else { 1453 tomoyo_set_slash(head); 1454 } 1455 tomoyo_set_string(head, tomoyo_mac_keywords 1456 [tomoyo_pnnn2mac[bit]]); 1457 } 1458 if (first) 1459 return true; 1460 tomoyo_print_name_union(head, &ptr->name); 1461 tomoyo_print_number_union(head, &ptr->mode); 1462 tomoyo_print_number_union(head, &ptr->major); 1463 tomoyo_print_number_union(head, &ptr->minor); 1464 } else if (acl_type == TOMOYO_TYPE_INET_ACL) { 1465 struct tomoyo_inet_acl *ptr = 1466 container_of(acl, typeof(*ptr), head); 1467 const u8 perm = ptr->perm; 1468 1469 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) { 1470 if (!(perm & (1 << bit))) 1471 continue; 1472 if (first) { 1473 tomoyo_set_group(head, "network inet "); 1474 tomoyo_set_string(head, tomoyo_proto_keyword 1475 [ptr->protocol]); 1476 tomoyo_set_space(head); 1477 first = false; 1478 } else { 1479 tomoyo_set_slash(head); 1480 } 1481 tomoyo_set_string(head, tomoyo_socket_keyword[bit]); 1482 } 1483 if (first) 1484 return true; 1485 tomoyo_set_space(head); 1486 if (ptr->address.group) { 1487 tomoyo_set_string(head, "@"); 1488 tomoyo_set_string(head, ptr->address.group->group_name 1489 ->name); 1490 } else { 1491 char buf[128]; 1492 tomoyo_print_ip(buf, sizeof(buf), &ptr->address); 1493 tomoyo_io_printf(head, "%s", buf); 1494 } 1495 tomoyo_print_number_union(head, &ptr->port); 1496 } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) { 1497 struct tomoyo_unix_acl *ptr = 1498 container_of(acl, typeof(*ptr), head); 1499 const u8 perm = ptr->perm; 1500 1501 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) { 1502 if (!(perm & (1 << bit))) 1503 continue; 1504 if (first) { 1505 tomoyo_set_group(head, "network unix "); 1506 tomoyo_set_string(head, tomoyo_proto_keyword 1507 [ptr->protocol]); 1508 tomoyo_set_space(head); 1509 first = false; 1510 } else { 1511 tomoyo_set_slash(head); 1512 } 1513 tomoyo_set_string(head, tomoyo_socket_keyword[bit]); 1514 } 1515 if (first) 1516 return true; 1517 tomoyo_print_name_union(head, &ptr->name); 1518 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) { 1519 struct tomoyo_mount_acl *ptr = 1520 container_of(acl, typeof(*ptr), head); 1521 tomoyo_set_group(head, "file mount"); 1522 tomoyo_print_name_union(head, &ptr->dev_name); 1523 tomoyo_print_name_union(head, &ptr->dir_name); 1524 tomoyo_print_name_union(head, &ptr->fs_type); 1525 tomoyo_print_number_union(head, &ptr->flags); 1526 } else if (acl_type == TOMOYO_TYPE_ENV_ACL) { 1527 struct tomoyo_env_acl *ptr = 1528 container_of(acl, typeof(*ptr), head); 1529 1530 tomoyo_set_group(head, "misc env "); 1531 tomoyo_set_string(head, ptr->env->name); 1532 } 1533 if (acl->cond) { 1534 head->r.print_cond_part = true; 1535 head->r.cond_step = 0; 1536 if (!tomoyo_flush(head)) 1537 return false; 1538 print_cond_part: 1539 if (!tomoyo_print_condition(head, acl->cond)) 1540 return false; 1541 head->r.print_cond_part = false; 1542 } else { 1543 tomoyo_set_lf(head); 1544 } 1545 return true; 1546 } 1547 1548 /** 1549 * tomoyo_read_domain2 - Read domain policy. 1550 * 1551 * @head: Pointer to "struct tomoyo_io_buffer". 1552 * @list: Pointer to "struct list_head". 1553 * 1554 * Caller holds tomoyo_read_lock(). 1555 * 1556 * Returns true on success, false otherwise. 1557 */ 1558 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head, 1559 struct list_head *list) 1560 { 1561 list_for_each_cookie(head->r.acl, list) { 1562 struct tomoyo_acl_info *ptr = 1563 list_entry(head->r.acl, typeof(*ptr), list); 1564 if (!tomoyo_print_entry(head, ptr)) 1565 return false; 1566 } 1567 head->r.acl = NULL; 1568 return true; 1569 } 1570 1571 /** 1572 * tomoyo_read_domain - Read domain policy. 1573 * 1574 * @head: Pointer to "struct tomoyo_io_buffer". 1575 * 1576 * Caller holds tomoyo_read_lock(). 1577 */ 1578 static void tomoyo_read_domain(struct tomoyo_io_buffer *head) 1579 { 1580 if (head->r.eof) 1581 return; 1582 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) { 1583 struct tomoyo_domain_info *domain = 1584 list_entry(head->r.domain, typeof(*domain), list); 1585 switch (head->r.step) { 1586 u8 i; 1587 case 0: 1588 if (domain->is_deleted && 1589 !head->r.print_this_domain_only) 1590 continue; 1591 /* Print domainname and flags. */ 1592 tomoyo_set_string(head, domain->domainname->name); 1593 tomoyo_set_lf(head); 1594 tomoyo_io_printf(head, "use_profile %u\n", 1595 domain->profile); 1596 tomoyo_io_printf(head, "use_group %u\n", 1597 domain->group); 1598 for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++) 1599 if (domain->flags[i]) 1600 tomoyo_set_string(head, tomoyo_dif[i]); 1601 head->r.step++; 1602 tomoyo_set_lf(head); 1603 /* fall through */ 1604 case 1: 1605 if (!tomoyo_read_domain2(head, &domain->acl_info_list)) 1606 return; 1607 head->r.step++; 1608 if (!tomoyo_set_lf(head)) 1609 return; 1610 /* fall through */ 1611 case 2: 1612 head->r.step = 0; 1613 if (head->r.print_this_domain_only) 1614 goto done; 1615 } 1616 } 1617 done: 1618 head->r.eof = true; 1619 } 1620 1621 /** 1622 * tomoyo_write_pid: Specify PID to obtain domainname. 1623 * 1624 * @head: Pointer to "struct tomoyo_io_buffer". 1625 * 1626 * Returns 0. 1627 */ 1628 static int tomoyo_write_pid(struct tomoyo_io_buffer *head) 1629 { 1630 head->r.eof = false; 1631 return 0; 1632 } 1633 1634 /** 1635 * tomoyo_read_pid - Get domainname of the specified PID. 1636 * 1637 * @head: Pointer to "struct tomoyo_io_buffer". 1638 * 1639 * Returns the domainname which the specified PID is in on success, 1640 * empty string otherwise. 1641 * The PID is specified by tomoyo_write_pid() so that the user can obtain 1642 * using read()/write() interface rather than sysctl() interface. 1643 */ 1644 static void tomoyo_read_pid(struct tomoyo_io_buffer *head) 1645 { 1646 char *buf = head->write_buf; 1647 bool global_pid = false; 1648 unsigned int pid; 1649 struct task_struct *p; 1650 struct tomoyo_domain_info *domain = NULL; 1651 1652 /* Accessing write_buf is safe because head->io_sem is held. */ 1653 if (!buf) { 1654 head->r.eof = true; 1655 return; /* Do nothing if open(O_RDONLY). */ 1656 } 1657 if (head->r.w_pos || head->r.eof) 1658 return; 1659 head->r.eof = true; 1660 if (tomoyo_str_starts(&buf, "global-pid ")) 1661 global_pid = true; 1662 pid = (unsigned int) simple_strtoul(buf, NULL, 10); 1663 rcu_read_lock(); 1664 if (global_pid) 1665 p = find_task_by_pid_ns(pid, &init_pid_ns); 1666 else 1667 p = find_task_by_vpid(pid); 1668 if (p) 1669 domain = tomoyo_real_domain(p); 1670 rcu_read_unlock(); 1671 if (!domain) 1672 return; 1673 tomoyo_io_printf(head, "%u %u ", pid, domain->profile); 1674 tomoyo_set_string(head, domain->domainname->name); 1675 } 1676 1677 /* String table for domain transition control keywords. */ 1678 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = { 1679 [TOMOYO_TRANSITION_CONTROL_NO_RESET] = "no_reset_domain ", 1680 [TOMOYO_TRANSITION_CONTROL_RESET] = "reset_domain ", 1681 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ", 1682 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ", 1683 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ", 1684 [TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain ", 1685 }; 1686 1687 /* String table for grouping keywords. */ 1688 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = { 1689 [TOMOYO_PATH_GROUP] = "path_group ", 1690 [TOMOYO_NUMBER_GROUP] = "number_group ", 1691 [TOMOYO_ADDRESS_GROUP] = "address_group ", 1692 }; 1693 1694 /** 1695 * tomoyo_write_exception - Write exception policy. 1696 * 1697 * @head: Pointer to "struct tomoyo_io_buffer". 1698 * 1699 * Returns 0 on success, negative value otherwise. 1700 * 1701 * Caller holds tomoyo_read_lock(). 1702 */ 1703 static int tomoyo_write_exception(struct tomoyo_io_buffer *head) 1704 { 1705 const bool is_delete = head->w.is_delete; 1706 struct tomoyo_acl_param param = { 1707 .ns = head->w.ns, 1708 .is_delete = is_delete, 1709 .data = head->write_buf, 1710 }; 1711 u8 i; 1712 if (tomoyo_str_starts(¶m.data, "aggregator ")) 1713 return tomoyo_write_aggregator(¶m); 1714 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++) 1715 if (tomoyo_str_starts(¶m.data, tomoyo_transition_type[i])) 1716 return tomoyo_write_transition_control(¶m, i); 1717 for (i = 0; i < TOMOYO_MAX_GROUP; i++) 1718 if (tomoyo_str_starts(¶m.data, tomoyo_group_name[i])) 1719 return tomoyo_write_group(¶m, i); 1720 if (tomoyo_str_starts(¶m.data, "acl_group ")) { 1721 unsigned int group; 1722 char *data; 1723 group = simple_strtoul(param.data, &data, 10); 1724 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ') 1725 return tomoyo_write_domain2 1726 (head->w.ns, &head->w.ns->acl_group[group], 1727 data, is_delete); 1728 } 1729 return -EINVAL; 1730 } 1731 1732 /** 1733 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list. 1734 * 1735 * @head: Pointer to "struct tomoyo_io_buffer". 1736 * @idx: Index number. 1737 * 1738 * Returns true on success, false otherwise. 1739 * 1740 * Caller holds tomoyo_read_lock(). 1741 */ 1742 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx) 1743 { 1744 struct tomoyo_policy_namespace *ns = 1745 container_of(head->r.ns, typeof(*ns), namespace_list); 1746 struct list_head *list = &ns->group_list[idx]; 1747 list_for_each_cookie(head->r.group, list) { 1748 struct tomoyo_group *group = 1749 list_entry(head->r.group, typeof(*group), head.list); 1750 list_for_each_cookie(head->r.acl, &group->member_list) { 1751 struct tomoyo_acl_head *ptr = 1752 list_entry(head->r.acl, typeof(*ptr), list); 1753 if (ptr->is_deleted) 1754 continue; 1755 if (!tomoyo_flush(head)) 1756 return false; 1757 tomoyo_print_namespace(head); 1758 tomoyo_set_string(head, tomoyo_group_name[idx]); 1759 tomoyo_set_string(head, group->group_name->name); 1760 if (idx == TOMOYO_PATH_GROUP) { 1761 tomoyo_set_space(head); 1762 tomoyo_set_string(head, container_of 1763 (ptr, struct tomoyo_path_group, 1764 head)->member_name->name); 1765 } else if (idx == TOMOYO_NUMBER_GROUP) { 1766 tomoyo_print_number_union(head, &container_of 1767 (ptr, 1768 struct tomoyo_number_group, 1769 head)->number); 1770 } else if (idx == TOMOYO_ADDRESS_GROUP) { 1771 char buffer[128]; 1772 1773 struct tomoyo_address_group *member = 1774 container_of(ptr, typeof(*member), 1775 head); 1776 tomoyo_print_ip(buffer, sizeof(buffer), 1777 &member->address); 1778 tomoyo_io_printf(head, " %s", buffer); 1779 } 1780 tomoyo_set_lf(head); 1781 } 1782 head->r.acl = NULL; 1783 } 1784 head->r.group = NULL; 1785 return true; 1786 } 1787 1788 /** 1789 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list. 1790 * 1791 * @head: Pointer to "struct tomoyo_io_buffer". 1792 * @idx: Index number. 1793 * 1794 * Returns true on success, false otherwise. 1795 * 1796 * Caller holds tomoyo_read_lock(). 1797 */ 1798 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx) 1799 { 1800 struct tomoyo_policy_namespace *ns = 1801 container_of(head->r.ns, typeof(*ns), namespace_list); 1802 struct list_head *list = &ns->policy_list[idx]; 1803 list_for_each_cookie(head->r.acl, list) { 1804 struct tomoyo_acl_head *acl = 1805 container_of(head->r.acl, typeof(*acl), list); 1806 if (acl->is_deleted) 1807 continue; 1808 if (!tomoyo_flush(head)) 1809 return false; 1810 switch (idx) { 1811 case TOMOYO_ID_TRANSITION_CONTROL: 1812 { 1813 struct tomoyo_transition_control *ptr = 1814 container_of(acl, typeof(*ptr), head); 1815 tomoyo_print_namespace(head); 1816 tomoyo_set_string(head, tomoyo_transition_type 1817 [ptr->type]); 1818 tomoyo_set_string(head, ptr->program ? 1819 ptr->program->name : "any"); 1820 tomoyo_set_string(head, " from "); 1821 tomoyo_set_string(head, ptr->domainname ? 1822 ptr->domainname->name : 1823 "any"); 1824 } 1825 break; 1826 case TOMOYO_ID_AGGREGATOR: 1827 { 1828 struct tomoyo_aggregator *ptr = 1829 container_of(acl, typeof(*ptr), head); 1830 tomoyo_print_namespace(head); 1831 tomoyo_set_string(head, "aggregator "); 1832 tomoyo_set_string(head, 1833 ptr->original_name->name); 1834 tomoyo_set_space(head); 1835 tomoyo_set_string(head, 1836 ptr->aggregated_name->name); 1837 } 1838 break; 1839 default: 1840 continue; 1841 } 1842 tomoyo_set_lf(head); 1843 } 1844 head->r.acl = NULL; 1845 return true; 1846 } 1847 1848 /** 1849 * tomoyo_read_exception - Read exception policy. 1850 * 1851 * @head: Pointer to "struct tomoyo_io_buffer". 1852 * 1853 * Caller holds tomoyo_read_lock(). 1854 */ 1855 static void tomoyo_read_exception(struct tomoyo_io_buffer *head) 1856 { 1857 struct tomoyo_policy_namespace *ns = 1858 container_of(head->r.ns, typeof(*ns), namespace_list); 1859 if (head->r.eof) 1860 return; 1861 while (head->r.step < TOMOYO_MAX_POLICY && 1862 tomoyo_read_policy(head, head->r.step)) 1863 head->r.step++; 1864 if (head->r.step < TOMOYO_MAX_POLICY) 1865 return; 1866 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP && 1867 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY)) 1868 head->r.step++; 1869 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP) 1870 return; 1871 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP 1872 + TOMOYO_MAX_ACL_GROUPS) { 1873 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY 1874 - TOMOYO_MAX_GROUP; 1875 if (!tomoyo_read_domain2(head, &ns->acl_group 1876 [head->r.acl_group_index])) 1877 return; 1878 head->r.step++; 1879 } 1880 head->r.eof = true; 1881 } 1882 1883 /* Wait queue for kernel -> userspace notification. */ 1884 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait); 1885 /* Wait queue for userspace -> kernel notification. */ 1886 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait); 1887 1888 /* Structure for query. */ 1889 struct tomoyo_query { 1890 struct list_head list; 1891 struct tomoyo_domain_info *domain; 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". */ 1901 static LIST_HEAD(tomoyo_query_list); 1902 1903 /* Lock for manipulating tomoyo_query_list. */ 1904 static DEFINE_SPINLOCK(tomoyo_query_list_lock); 1905 1906 /* 1907 * Number of "struct file" referring /sys/kernel/security/tomoyo/query 1908 * interface. 1909 */ 1910 static 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 */ 1919 static 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 */ 1936 static 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 */ 1995 int 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 entry.domain = r->domain; 2043 spin_lock(&tomoyo_query_list_lock); 2044 if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] && 2045 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len 2046 >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) { 2047 quota_exceeded = true; 2048 } else { 2049 entry.serial = tomoyo_serial++; 2050 entry.retry = r->retry; 2051 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len; 2052 list_add_tail(&entry.list, &tomoyo_query_list); 2053 } 2054 spin_unlock(&tomoyo_query_list_lock); 2055 if (quota_exceeded) 2056 goto out; 2057 /* Give 10 seconds for supervisor's opinion. */ 2058 while (entry.timer < 10) { 2059 wake_up_all(&tomoyo_query_wait); 2060 if (wait_event_interruptible_timeout 2061 (tomoyo_answer_wait, entry.answer || 2062 !atomic_read(&tomoyo_query_observers), HZ)) 2063 break; 2064 else 2065 entry.timer++; 2066 } 2067 spin_lock(&tomoyo_query_list_lock); 2068 list_del(&entry.list); 2069 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len; 2070 spin_unlock(&tomoyo_query_list_lock); 2071 switch (entry.answer) { 2072 case 3: /* Asked to retry by administrator. */ 2073 error = TOMOYO_RETRY_REQUEST; 2074 r->retry++; 2075 break; 2076 case 1: 2077 /* Granted by administrator. */ 2078 error = 0; 2079 break; 2080 default: 2081 /* Timed out or rejected by administrator. */ 2082 break; 2083 } 2084 out: 2085 kfree(entry.query); 2086 return error; 2087 } 2088 2089 /** 2090 * tomoyo_find_domain_by_qid - Get domain by query id. 2091 * 2092 * @serial: Query ID assigned by tomoyo_supervisor(). 2093 * 2094 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise. 2095 */ 2096 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid 2097 (unsigned int serial) 2098 { 2099 struct tomoyo_query *ptr; 2100 struct tomoyo_domain_info *domain = NULL; 2101 spin_lock(&tomoyo_query_list_lock); 2102 list_for_each_entry(ptr, &tomoyo_query_list, list) { 2103 if (ptr->serial != serial) 2104 continue; 2105 domain = ptr->domain; 2106 break; 2107 } 2108 spin_unlock(&tomoyo_query_list_lock); 2109 return domain; 2110 } 2111 2112 /** 2113 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query. 2114 * 2115 * @file: Pointer to "struct file". 2116 * @wait: Pointer to "poll_table". 2117 * 2118 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. 2119 * 2120 * Waits for access requests which violated policy in enforcing mode. 2121 */ 2122 static unsigned int tomoyo_poll_query(struct file *file, poll_table *wait) 2123 { 2124 if (!list_empty(&tomoyo_query_list)) 2125 return POLLIN | POLLRDNORM; 2126 poll_wait(file, &tomoyo_query_wait, wait); 2127 if (!list_empty(&tomoyo_query_list)) 2128 return POLLIN | POLLRDNORM; 2129 return 0; 2130 } 2131 2132 /** 2133 * tomoyo_read_query - Read access requests which violated policy in enforcing mode. 2134 * 2135 * @head: Pointer to "struct tomoyo_io_buffer". 2136 */ 2137 static void tomoyo_read_query(struct tomoyo_io_buffer *head) 2138 { 2139 struct list_head *tmp; 2140 unsigned int pos = 0; 2141 size_t len = 0; 2142 char *buf; 2143 if (head->r.w_pos) 2144 return; 2145 if (head->read_buf) { 2146 kfree(head->read_buf); 2147 head->read_buf = NULL; 2148 } 2149 spin_lock(&tomoyo_query_list_lock); 2150 list_for_each(tmp, &tomoyo_query_list) { 2151 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2152 if (pos++ != head->r.query_index) 2153 continue; 2154 len = ptr->query_len; 2155 break; 2156 } 2157 spin_unlock(&tomoyo_query_list_lock); 2158 if (!len) { 2159 head->r.query_index = 0; 2160 return; 2161 } 2162 buf = kzalloc(len + 32, GFP_NOFS); 2163 if (!buf) 2164 return; 2165 pos = 0; 2166 spin_lock(&tomoyo_query_list_lock); 2167 list_for_each(tmp, &tomoyo_query_list) { 2168 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2169 if (pos++ != head->r.query_index) 2170 continue; 2171 /* 2172 * Some query can be skipped because tomoyo_query_list 2173 * can change, but I don't care. 2174 */ 2175 if (len == ptr->query_len) 2176 snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial, 2177 ptr->retry, ptr->query); 2178 break; 2179 } 2180 spin_unlock(&tomoyo_query_list_lock); 2181 if (buf[0]) { 2182 head->read_buf = buf; 2183 head->r.w[head->r.w_pos++] = buf; 2184 head->r.query_index++; 2185 } else { 2186 kfree(buf); 2187 } 2188 } 2189 2190 /** 2191 * tomoyo_write_answer - Write the supervisor's decision. 2192 * 2193 * @head: Pointer to "struct tomoyo_io_buffer". 2194 * 2195 * Returns 0 on success, -EINVAL otherwise. 2196 */ 2197 static int tomoyo_write_answer(struct tomoyo_io_buffer *head) 2198 { 2199 char *data = head->write_buf; 2200 struct list_head *tmp; 2201 unsigned int serial; 2202 unsigned int answer; 2203 spin_lock(&tomoyo_query_list_lock); 2204 list_for_each(tmp, &tomoyo_query_list) { 2205 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2206 ptr->timer = 0; 2207 } 2208 spin_unlock(&tomoyo_query_list_lock); 2209 if (sscanf(data, "A%u=%u", &serial, &answer) != 2) 2210 return -EINVAL; 2211 spin_lock(&tomoyo_query_list_lock); 2212 list_for_each(tmp, &tomoyo_query_list) { 2213 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2214 if (ptr->serial != serial) 2215 continue; 2216 ptr->answer = answer; 2217 /* Remove from tomoyo_query_list. */ 2218 if (ptr->answer) 2219 list_del_init(&ptr->list); 2220 break; 2221 } 2222 spin_unlock(&tomoyo_query_list_lock); 2223 return 0; 2224 } 2225 2226 /** 2227 * tomoyo_read_version: Get version. 2228 * 2229 * @head: Pointer to "struct tomoyo_io_buffer". 2230 * 2231 * Returns version information. 2232 */ 2233 static void tomoyo_read_version(struct tomoyo_io_buffer *head) 2234 { 2235 if (!head->r.eof) { 2236 tomoyo_io_printf(head, "2.5.0"); 2237 head->r.eof = true; 2238 } 2239 } 2240 2241 /* String table for /sys/kernel/security/tomoyo/stat interface. */ 2242 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = { 2243 [TOMOYO_STAT_POLICY_UPDATES] = "update:", 2244 [TOMOYO_STAT_POLICY_LEARNING] = "violation in learning mode:", 2245 [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:", 2246 [TOMOYO_STAT_POLICY_ENFORCING] = "violation in enforcing mode:", 2247 }; 2248 2249 /* String table for /sys/kernel/security/tomoyo/stat interface. */ 2250 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = { 2251 [TOMOYO_MEMORY_POLICY] = "policy:", 2252 [TOMOYO_MEMORY_AUDIT] = "audit log:", 2253 [TOMOYO_MEMORY_QUERY] = "query message:", 2254 }; 2255 2256 /* Timestamp counter for last updated. */ 2257 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT]; 2258 /* Counter for number of updates. */ 2259 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT]; 2260 2261 /** 2262 * tomoyo_update_stat - Update statistic counters. 2263 * 2264 * @index: Index for policy type. 2265 * 2266 * Returns nothing. 2267 */ 2268 void tomoyo_update_stat(const u8 index) 2269 { 2270 /* 2271 * I don't use atomic operations because race condition is not fatal. 2272 */ 2273 tomoyo_stat_updated[index]++; 2274 tomoyo_stat_modified[index] = get_seconds(); 2275 } 2276 2277 /** 2278 * tomoyo_read_stat - Read statistic data. 2279 * 2280 * @head: Pointer to "struct tomoyo_io_buffer". 2281 * 2282 * Returns nothing. 2283 */ 2284 static void tomoyo_read_stat(struct tomoyo_io_buffer *head) 2285 { 2286 u8 i; 2287 unsigned int total = 0; 2288 if (head->r.eof) 2289 return; 2290 for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) { 2291 tomoyo_io_printf(head, "Policy %-30s %10u", 2292 tomoyo_policy_headers[i], 2293 tomoyo_stat_updated[i]); 2294 if (tomoyo_stat_modified[i]) { 2295 struct tomoyo_time stamp; 2296 tomoyo_convert_time(tomoyo_stat_modified[i], &stamp); 2297 tomoyo_io_printf(head, " (Last: %04u/%02u/%02u " 2298 "%02u:%02u:%02u)", 2299 stamp.year, stamp.month, stamp.day, 2300 stamp.hour, stamp.min, stamp.sec); 2301 } 2302 tomoyo_set_lf(head); 2303 } 2304 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) { 2305 unsigned int used = tomoyo_memory_used[i]; 2306 total += used; 2307 tomoyo_io_printf(head, "Memory used by %-22s %10u", 2308 tomoyo_memory_headers[i], used); 2309 used = tomoyo_memory_quota[i]; 2310 if (used) 2311 tomoyo_io_printf(head, " (Quota: %10u)", used); 2312 tomoyo_set_lf(head); 2313 } 2314 tomoyo_io_printf(head, "Total memory used: %10u\n", 2315 total); 2316 head->r.eof = true; 2317 } 2318 2319 /** 2320 * tomoyo_write_stat - Set memory quota. 2321 * 2322 * @head: Pointer to "struct tomoyo_io_buffer". 2323 * 2324 * Returns 0. 2325 */ 2326 static int tomoyo_write_stat(struct tomoyo_io_buffer *head) 2327 { 2328 char *data = head->write_buf; 2329 u8 i; 2330 if (tomoyo_str_starts(&data, "Memory used by ")) 2331 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) 2332 if (tomoyo_str_starts(&data, tomoyo_memory_headers[i])) 2333 sscanf(data, "%u", &tomoyo_memory_quota[i]); 2334 return 0; 2335 } 2336 2337 /** 2338 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. 2339 * 2340 * @type: Type of interface. 2341 * @file: Pointer to "struct file". 2342 * 2343 * Returns 0 on success, negative value otherwise. 2344 */ 2345 int tomoyo_open_control(const u8 type, struct file *file) 2346 { 2347 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS); 2348 2349 if (!head) 2350 return -ENOMEM; 2351 mutex_init(&head->io_sem); 2352 head->type = type; 2353 switch (type) { 2354 case TOMOYO_DOMAINPOLICY: 2355 /* /sys/kernel/security/tomoyo/domain_policy */ 2356 head->write = tomoyo_write_domain; 2357 head->read = tomoyo_read_domain; 2358 break; 2359 case TOMOYO_EXCEPTIONPOLICY: 2360 /* /sys/kernel/security/tomoyo/exception_policy */ 2361 head->write = tomoyo_write_exception; 2362 head->read = tomoyo_read_exception; 2363 break; 2364 case TOMOYO_AUDIT: 2365 /* /sys/kernel/security/tomoyo/audit */ 2366 head->poll = tomoyo_poll_log; 2367 head->read = tomoyo_read_log; 2368 break; 2369 case TOMOYO_PROCESS_STATUS: 2370 /* /sys/kernel/security/tomoyo/.process_status */ 2371 head->write = tomoyo_write_pid; 2372 head->read = tomoyo_read_pid; 2373 break; 2374 case TOMOYO_VERSION: 2375 /* /sys/kernel/security/tomoyo/version */ 2376 head->read = tomoyo_read_version; 2377 head->readbuf_size = 128; 2378 break; 2379 case TOMOYO_STAT: 2380 /* /sys/kernel/security/tomoyo/stat */ 2381 head->write = tomoyo_write_stat; 2382 head->read = tomoyo_read_stat; 2383 head->readbuf_size = 1024; 2384 break; 2385 case TOMOYO_PROFILE: 2386 /* /sys/kernel/security/tomoyo/profile */ 2387 head->write = tomoyo_write_profile; 2388 head->read = tomoyo_read_profile; 2389 break; 2390 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */ 2391 head->poll = tomoyo_poll_query; 2392 head->write = tomoyo_write_answer; 2393 head->read = tomoyo_read_query; 2394 break; 2395 case TOMOYO_MANAGER: 2396 /* /sys/kernel/security/tomoyo/manager */ 2397 head->write = tomoyo_write_manager; 2398 head->read = tomoyo_read_manager; 2399 break; 2400 } 2401 if (!(file->f_mode & FMODE_READ)) { 2402 /* 2403 * No need to allocate read_buf since it is not opened 2404 * for reading. 2405 */ 2406 head->read = NULL; 2407 head->poll = NULL; 2408 } else if (!head->poll) { 2409 /* Don't allocate read_buf for poll() access. */ 2410 if (!head->readbuf_size) 2411 head->readbuf_size = 4096 * 2; 2412 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS); 2413 if (!head->read_buf) { 2414 kfree(head); 2415 return -ENOMEM; 2416 } 2417 } 2418 if (!(file->f_mode & FMODE_WRITE)) { 2419 /* 2420 * No need to allocate write_buf since it is not opened 2421 * for writing. 2422 */ 2423 head->write = NULL; 2424 } else if (head->write) { 2425 head->writebuf_size = 4096 * 2; 2426 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS); 2427 if (!head->write_buf) { 2428 kfree(head->read_buf); 2429 kfree(head); 2430 return -ENOMEM; 2431 } 2432 } 2433 /* 2434 * If the file is /sys/kernel/security/tomoyo/query , increment the 2435 * observer counter. 2436 * The obserber counter is used by tomoyo_supervisor() to see if 2437 * there is some process monitoring /sys/kernel/security/tomoyo/query. 2438 */ 2439 if (type == TOMOYO_QUERY) 2440 atomic_inc(&tomoyo_query_observers); 2441 file->private_data = head; 2442 tomoyo_notify_gc(head, true); 2443 return 0; 2444 } 2445 2446 /** 2447 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface. 2448 * 2449 * @file: Pointer to "struct file". 2450 * @wait: Pointer to "poll_table". Maybe NULL. 2451 * 2452 * Returns POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM if ready to read/write, 2453 * POLLOUT | POLLWRNORM otherwise. 2454 */ 2455 unsigned int tomoyo_poll_control(struct file *file, poll_table *wait) 2456 { 2457 struct tomoyo_io_buffer *head = file->private_data; 2458 if (head->poll) 2459 return head->poll(file, wait) | POLLOUT | POLLWRNORM; 2460 return POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM; 2461 } 2462 2463 /** 2464 * tomoyo_set_namespace_cursor - Set namespace to read. 2465 * 2466 * @head: Pointer to "struct tomoyo_io_buffer". 2467 * 2468 * Returns nothing. 2469 */ 2470 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head) 2471 { 2472 struct list_head *ns; 2473 if (head->type != TOMOYO_EXCEPTIONPOLICY && 2474 head->type != TOMOYO_PROFILE) 2475 return; 2476 /* 2477 * If this is the first read, or reading previous namespace finished 2478 * and has more namespaces to read, update the namespace cursor. 2479 */ 2480 ns = head->r.ns; 2481 if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) { 2482 /* Clearing is OK because tomoyo_flush() returned true. */ 2483 memset(&head->r, 0, sizeof(head->r)); 2484 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next; 2485 } 2486 } 2487 2488 /** 2489 * tomoyo_has_more_namespace - Check for unread namespaces. 2490 * 2491 * @head: Pointer to "struct tomoyo_io_buffer". 2492 * 2493 * Returns true if we have more entries to print, false otherwise. 2494 */ 2495 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head) 2496 { 2497 return (head->type == TOMOYO_EXCEPTIONPOLICY || 2498 head->type == TOMOYO_PROFILE) && head->r.eof && 2499 head->r.ns->next != &tomoyo_namespace_list; 2500 } 2501 2502 /** 2503 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. 2504 * 2505 * @head: Pointer to "struct tomoyo_io_buffer". 2506 * @buffer: Poiner to buffer to write to. 2507 * @buffer_len: Size of @buffer. 2508 * 2509 * Returns bytes read on success, negative value otherwise. 2510 */ 2511 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer, 2512 const int buffer_len) 2513 { 2514 int len; 2515 int idx; 2516 2517 if (!head->read) 2518 return -ENOSYS; 2519 if (mutex_lock_interruptible(&head->io_sem)) 2520 return -EINTR; 2521 head->read_user_buf = buffer; 2522 head->read_user_buf_avail = buffer_len; 2523 idx = tomoyo_read_lock(); 2524 if (tomoyo_flush(head)) 2525 /* Call the policy handler. */ 2526 do { 2527 tomoyo_set_namespace_cursor(head); 2528 head->read(head); 2529 } while (tomoyo_flush(head) && 2530 tomoyo_has_more_namespace(head)); 2531 tomoyo_read_unlock(idx); 2532 len = head->read_user_buf - buffer; 2533 mutex_unlock(&head->io_sem); 2534 return len; 2535 } 2536 2537 /** 2538 * tomoyo_parse_policy - Parse a policy line. 2539 * 2540 * @head: Poiter to "struct tomoyo_io_buffer". 2541 * @line: Line to parse. 2542 * 2543 * Returns 0 on success, negative value otherwise. 2544 * 2545 * Caller holds tomoyo_read_lock(). 2546 */ 2547 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line) 2548 { 2549 /* Delete request? */ 2550 head->w.is_delete = !strncmp(line, "delete ", 7); 2551 if (head->w.is_delete) 2552 memmove(line, line + 7, strlen(line + 7) + 1); 2553 /* Selecting namespace to update. */ 2554 if (head->type == TOMOYO_EXCEPTIONPOLICY || 2555 head->type == TOMOYO_PROFILE) { 2556 if (*line == '<') { 2557 char *cp = strchr(line, ' '); 2558 if (cp) { 2559 *cp++ = '\0'; 2560 head->w.ns = tomoyo_assign_namespace(line); 2561 memmove(line, cp, strlen(cp) + 1); 2562 } else 2563 head->w.ns = NULL; 2564 } else 2565 head->w.ns = &tomoyo_kernel_namespace; 2566 /* Don't allow updating if namespace is invalid. */ 2567 if (!head->w.ns) 2568 return -ENOENT; 2569 } 2570 /* Do the update. */ 2571 return head->write(head); 2572 } 2573 2574 /** 2575 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. 2576 * 2577 * @head: Pointer to "struct tomoyo_io_buffer". 2578 * @buffer: Pointer to buffer to read from. 2579 * @buffer_len: Size of @buffer. 2580 * 2581 * Returns @buffer_len on success, negative value otherwise. 2582 */ 2583 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head, 2584 const char __user *buffer, const int buffer_len) 2585 { 2586 int error = buffer_len; 2587 size_t avail_len = buffer_len; 2588 char *cp0 = head->write_buf; 2589 int idx; 2590 if (!head->write) 2591 return -ENOSYS; 2592 if (!access_ok(VERIFY_READ, buffer, buffer_len)) 2593 return -EFAULT; 2594 if (mutex_lock_interruptible(&head->io_sem)) 2595 return -EINTR; 2596 head->read_user_buf_avail = 0; 2597 idx = tomoyo_read_lock(); 2598 /* Read a line and dispatch it to the policy handler. */ 2599 while (avail_len > 0) { 2600 char c; 2601 if (head->w.avail >= head->writebuf_size - 1) { 2602 const int len = head->writebuf_size * 2; 2603 char *cp = kzalloc(len, GFP_NOFS); 2604 if (!cp) { 2605 error = -ENOMEM; 2606 break; 2607 } 2608 memmove(cp, cp0, head->w.avail); 2609 kfree(cp0); 2610 head->write_buf = cp; 2611 cp0 = cp; 2612 head->writebuf_size = len; 2613 } 2614 if (get_user(c, buffer)) { 2615 error = -EFAULT; 2616 break; 2617 } 2618 buffer++; 2619 avail_len--; 2620 cp0[head->w.avail++] = c; 2621 if (c != '\n') 2622 continue; 2623 cp0[head->w.avail - 1] = '\0'; 2624 head->w.avail = 0; 2625 tomoyo_normalize_line(cp0); 2626 if (!strcmp(cp0, "reset")) { 2627 head->w.ns = &tomoyo_kernel_namespace; 2628 head->w.domain = NULL; 2629 memset(&head->r, 0, sizeof(head->r)); 2630 continue; 2631 } 2632 /* Don't allow updating policies by non manager programs. */ 2633 switch (head->type) { 2634 case TOMOYO_PROCESS_STATUS: 2635 /* This does not write anything. */ 2636 break; 2637 case TOMOYO_DOMAINPOLICY: 2638 if (tomoyo_select_domain(head, cp0)) 2639 continue; 2640 /* fall through */ 2641 case TOMOYO_EXCEPTIONPOLICY: 2642 if (!strcmp(cp0, "select transition_only")) { 2643 head->r.print_transition_related_only = true; 2644 continue; 2645 } 2646 /* fall through */ 2647 default: 2648 if (!tomoyo_manager()) { 2649 error = -EPERM; 2650 goto out; 2651 } 2652 } 2653 switch (tomoyo_parse_policy(head, cp0)) { 2654 case -EPERM: 2655 error = -EPERM; 2656 goto out; 2657 case 0: 2658 switch (head->type) { 2659 case TOMOYO_DOMAINPOLICY: 2660 case TOMOYO_EXCEPTIONPOLICY: 2661 case TOMOYO_STAT: 2662 case TOMOYO_PROFILE: 2663 case TOMOYO_MANAGER: 2664 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES); 2665 break; 2666 default: 2667 break; 2668 } 2669 break; 2670 } 2671 } 2672 out: 2673 tomoyo_read_unlock(idx); 2674 mutex_unlock(&head->io_sem); 2675 return error; 2676 } 2677 2678 /** 2679 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. 2680 * 2681 * @head: Pointer to "struct tomoyo_io_buffer". 2682 */ 2683 void tomoyo_close_control(struct tomoyo_io_buffer *head) 2684 { 2685 /* 2686 * If the file is /sys/kernel/security/tomoyo/query , decrement the 2687 * observer counter. 2688 */ 2689 if (head->type == TOMOYO_QUERY && 2690 atomic_dec_and_test(&tomoyo_query_observers)) 2691 wake_up_all(&tomoyo_answer_wait); 2692 tomoyo_notify_gc(head, false); 2693 } 2694 2695 /** 2696 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined. 2697 */ 2698 void tomoyo_check_profile(void) 2699 { 2700 struct tomoyo_domain_info *domain; 2701 const int idx = tomoyo_read_lock(); 2702 tomoyo_policy_loaded = true; 2703 printk(KERN_INFO "TOMOYO: 2.5.0\n"); 2704 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 2705 const u8 profile = domain->profile; 2706 const struct tomoyo_policy_namespace *ns = domain->ns; 2707 if (ns->profile_version != 20110903) 2708 printk(KERN_ERR 2709 "Profile version %u is not supported.\n", 2710 ns->profile_version); 2711 else if (!ns->profile_ptr[profile]) 2712 printk(KERN_ERR 2713 "Profile %u (used by '%s') is not defined.\n", 2714 profile, domain->domainname->name); 2715 else 2716 continue; 2717 printk(KERN_ERR 2718 "Userland tools for TOMOYO 2.5 must be installed and " 2719 "policy must be initialized.\n"); 2720 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ " 2721 "for more information.\n"); 2722 panic("STOP!"); 2723 } 2724 tomoyo_read_unlock(idx); 2725 printk(KERN_INFO "Mandatory Access Control activated.\n"); 2726 } 2727 2728 /** 2729 * tomoyo_load_builtin_policy - Load built-in policy. 2730 * 2731 * Returns nothing. 2732 */ 2733 void __init tomoyo_load_builtin_policy(void) 2734 { 2735 /* 2736 * This include file is manually created and contains built-in policy 2737 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy", 2738 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager", 2739 * "tomoyo_builtin_stat" in the form of "static char [] __initdata". 2740 */ 2741 #include "builtin-policy.h" 2742 u8 i; 2743 const int idx = tomoyo_read_lock(); 2744 for (i = 0; i < 5; i++) { 2745 struct tomoyo_io_buffer head = { }; 2746 char *start = ""; 2747 switch (i) { 2748 case 0: 2749 start = tomoyo_builtin_profile; 2750 head.type = TOMOYO_PROFILE; 2751 head.write = tomoyo_write_profile; 2752 break; 2753 case 1: 2754 start = tomoyo_builtin_exception_policy; 2755 head.type = TOMOYO_EXCEPTIONPOLICY; 2756 head.write = tomoyo_write_exception; 2757 break; 2758 case 2: 2759 start = tomoyo_builtin_domain_policy; 2760 head.type = TOMOYO_DOMAINPOLICY; 2761 head.write = tomoyo_write_domain; 2762 break; 2763 case 3: 2764 start = tomoyo_builtin_manager; 2765 head.type = TOMOYO_MANAGER; 2766 head.write = tomoyo_write_manager; 2767 break; 2768 case 4: 2769 start = tomoyo_builtin_stat; 2770 head.type = TOMOYO_STAT; 2771 head.write = tomoyo_write_stat; 2772 break; 2773 } 2774 while (1) { 2775 char *end = strchr(start, '\n'); 2776 if (!end) 2777 break; 2778 *end = '\0'; 2779 tomoyo_normalize_line(start); 2780 head.write_buf = start; 2781 tomoyo_parse_policy(&head, start); 2782 start = end + 1; 2783 } 2784 } 2785 tomoyo_read_unlock(idx); 2786 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER 2787 tomoyo_check_profile(); 2788 #endif 2789 } 2790