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_domain_def(manager)) { 854 if (!tomoyo_correct_domain(manager)) 855 return -EINVAL; 856 e.is_domain = true; 857 } else { 858 if (!tomoyo_correct_path(manager)) 859 return -EINVAL; 860 } 861 e.manager = tomoyo_get_name(manager); 862 if (e.manager) { 863 error = tomoyo_update_policy(&e.head, sizeof(e), ¶m, 864 tomoyo_same_manager); 865 tomoyo_put_name(e.manager); 866 } 867 return error; 868 } 869 870 /** 871 * tomoyo_write_manager - Write manager policy. 872 * 873 * @head: Pointer to "struct tomoyo_io_buffer". 874 * 875 * Returns 0 on success, negative value otherwise. 876 * 877 * Caller holds tomoyo_read_lock(). 878 */ 879 static int tomoyo_write_manager(struct tomoyo_io_buffer *head) 880 { 881 char *data = head->write_buf; 882 883 if (!strcmp(data, "manage_by_non_root")) { 884 tomoyo_manage_by_non_root = !head->w.is_delete; 885 return 0; 886 } 887 return tomoyo_update_manager_entry(data, head->w.is_delete); 888 } 889 890 /** 891 * tomoyo_read_manager - Read manager policy. 892 * 893 * @head: Pointer to "struct tomoyo_io_buffer". 894 * 895 * Caller holds tomoyo_read_lock(). 896 */ 897 static void tomoyo_read_manager(struct tomoyo_io_buffer *head) 898 { 899 if (head->r.eof) 900 return; 901 list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace. 902 policy_list[TOMOYO_ID_MANAGER]) { 903 struct tomoyo_manager *ptr = 904 list_entry(head->r.acl, typeof(*ptr), head.list); 905 if (ptr->head.is_deleted) 906 continue; 907 if (!tomoyo_flush(head)) 908 return; 909 tomoyo_set_string(head, ptr->manager->name); 910 tomoyo_set_lf(head); 911 } 912 head->r.eof = true; 913 } 914 915 /** 916 * tomoyo_manager - Check whether the current process is a policy manager. 917 * 918 * Returns true if the current process is permitted to modify policy 919 * via /sys/kernel/security/tomoyo/ interface. 920 * 921 * Caller holds tomoyo_read_lock(). 922 */ 923 static bool tomoyo_manager(void) 924 { 925 struct tomoyo_manager *ptr; 926 const char *exe; 927 const struct task_struct *task = current; 928 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname; 929 bool found = false; 930 931 if (!tomoyo_policy_loaded) 932 return true; 933 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid)) 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 && ptr->is_domain 938 && !tomoyo_pathcmp(domainname, ptr->manager)) { 939 found = true; 940 break; 941 } 942 } 943 if (found) 944 return true; 945 exe = tomoyo_get_exe(); 946 if (!exe) 947 return false; 948 list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace. 949 policy_list[TOMOYO_ID_MANAGER], head.list) { 950 if (!ptr->head.is_deleted && !ptr->is_domain 951 && !strcmp(exe, ptr->manager->name)) { 952 found = true; 953 break; 954 } 955 } 956 if (!found) { /* Reduce error messages. */ 957 static pid_t last_pid; 958 const pid_t pid = current->pid; 959 if (last_pid != pid) { 960 printk(KERN_WARNING "%s ( %s ) is not permitted to " 961 "update policies.\n", domainname->name, exe); 962 last_pid = pid; 963 } 964 } 965 kfree(exe); 966 return found; 967 } 968 969 /** 970 * tomoyo_select_domain - Parse select command. 971 * 972 * @head: Pointer to "struct tomoyo_io_buffer". 973 * @data: String to parse. 974 * 975 * Returns true on success, false otherwise. 976 * 977 * Caller holds tomoyo_read_lock(). 978 */ 979 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head, 980 const char *data) 981 { 982 unsigned int pid; 983 struct tomoyo_domain_info *domain = NULL; 984 bool global_pid = false; 985 if (strncmp(data, "select ", 7)) 986 return false; 987 data += 7; 988 if (sscanf(data, "pid=%u", &pid) == 1 || 989 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { 990 struct task_struct *p; 991 rcu_read_lock(); 992 if (global_pid) 993 p = find_task_by_pid_ns(pid, &init_pid_ns); 994 else 995 p = find_task_by_vpid(pid); 996 if (p) 997 domain = tomoyo_real_domain(p); 998 rcu_read_unlock(); 999 } else if (!strncmp(data, "domain=", 7)) { 1000 if (tomoyo_domain_def(data + 7)) 1001 domain = tomoyo_find_domain(data + 7); 1002 } else 1003 return false; 1004 head->w.domain = domain; 1005 /* Accessing read_buf is safe because head->io_sem is held. */ 1006 if (!head->read_buf) 1007 return true; /* Do nothing if open(O_WRONLY). */ 1008 memset(&head->r, 0, sizeof(head->r)); 1009 head->r.print_this_domain_only = true; 1010 if (domain) 1011 head->r.domain = &domain->list; 1012 else 1013 head->r.eof = 1; 1014 tomoyo_io_printf(head, "# select %s\n", data); 1015 if (domain && domain->is_deleted) 1016 tomoyo_io_printf(head, "# This is a deleted domain.\n"); 1017 return true; 1018 } 1019 1020 /** 1021 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry. 1022 * 1023 * @a: Pointer to "struct tomoyo_acl_info". 1024 * @b: Pointer to "struct tomoyo_acl_info". 1025 * 1026 * Returns true if @a == @b, false otherwise. 1027 */ 1028 static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a, 1029 const struct tomoyo_acl_info *b) 1030 { 1031 const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head); 1032 const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head); 1033 return p1->domainname == p2->domainname; 1034 } 1035 1036 /** 1037 * tomoyo_write_task - Update task related list. 1038 * 1039 * @param: Pointer to "struct tomoyo_acl_param". 1040 * 1041 * Returns 0 on success, negative value otherwise. 1042 * 1043 * Caller holds tomoyo_read_lock(). 1044 */ 1045 static int tomoyo_write_task(struct tomoyo_acl_param *param) 1046 { 1047 int error = -EINVAL; 1048 if (tomoyo_str_starts(¶m->data, "manual_domain_transition ")) { 1049 struct tomoyo_task_acl e = { 1050 .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL, 1051 .domainname = tomoyo_get_domainname(param), 1052 }; 1053 if (e.domainname) 1054 error = tomoyo_update_domain(&e.head, sizeof(e), param, 1055 tomoyo_same_task_acl, 1056 NULL); 1057 tomoyo_put_name(e.domainname); 1058 } 1059 return error; 1060 } 1061 1062 /** 1063 * tomoyo_delete_domain - Delete a domain. 1064 * 1065 * @domainname: The name of domain. 1066 * 1067 * Returns 0. 1068 * 1069 * Caller holds tomoyo_read_lock(). 1070 */ 1071 static int tomoyo_delete_domain(char *domainname) 1072 { 1073 struct tomoyo_domain_info *domain; 1074 struct tomoyo_path_info name; 1075 1076 name.name = domainname; 1077 tomoyo_fill_path_info(&name); 1078 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 1079 return 0; 1080 /* Is there an active domain? */ 1081 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 1082 /* Never delete tomoyo_kernel_domain */ 1083 if (domain == &tomoyo_kernel_domain) 1084 continue; 1085 if (domain->is_deleted || 1086 tomoyo_pathcmp(domain->domainname, &name)) 1087 continue; 1088 domain->is_deleted = true; 1089 break; 1090 } 1091 mutex_unlock(&tomoyo_policy_lock); 1092 return 0; 1093 } 1094 1095 /** 1096 * tomoyo_write_domain2 - Write domain policy. 1097 * 1098 * @ns: Pointer to "struct tomoyo_policy_namespace". 1099 * @list: Pointer to "struct list_head". 1100 * @data: Policy to be interpreted. 1101 * @is_delete: True if it is a delete request. 1102 * 1103 * Returns 0 on success, negative value otherwise. 1104 * 1105 * Caller holds tomoyo_read_lock(). 1106 */ 1107 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns, 1108 struct list_head *list, char *data, 1109 const bool is_delete) 1110 { 1111 struct tomoyo_acl_param param = { 1112 .ns = ns, 1113 .list = list, 1114 .data = data, 1115 .is_delete = is_delete, 1116 }; 1117 static const struct { 1118 const char *keyword; 1119 int (*write) (struct tomoyo_acl_param *); 1120 } tomoyo_callback[5] = { 1121 { "file ", tomoyo_write_file }, 1122 { "network inet ", tomoyo_write_inet_network }, 1123 { "network unix ", tomoyo_write_unix_network }, 1124 { "misc ", tomoyo_write_misc }, 1125 { "task ", tomoyo_write_task }, 1126 }; 1127 u8 i; 1128 1129 for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) { 1130 if (!tomoyo_str_starts(¶m.data, 1131 tomoyo_callback[i].keyword)) 1132 continue; 1133 return tomoyo_callback[i].write(¶m); 1134 } 1135 return -EINVAL; 1136 } 1137 1138 /* String table for domain flags. */ 1139 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = { 1140 [TOMOYO_DIF_QUOTA_WARNED] = "quota_exceeded\n", 1141 [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n", 1142 }; 1143 1144 /** 1145 * tomoyo_write_domain - Write domain policy. 1146 * 1147 * @head: Pointer to "struct tomoyo_io_buffer". 1148 * 1149 * Returns 0 on success, negative value otherwise. 1150 * 1151 * Caller holds tomoyo_read_lock(). 1152 */ 1153 static int tomoyo_write_domain(struct tomoyo_io_buffer *head) 1154 { 1155 char *data = head->write_buf; 1156 struct tomoyo_policy_namespace *ns; 1157 struct tomoyo_domain_info *domain = head->w.domain; 1158 const bool is_delete = head->w.is_delete; 1159 bool is_select = !is_delete && tomoyo_str_starts(&data, "select "); 1160 unsigned int profile; 1161 if (*data == '<') { 1162 domain = NULL; 1163 if (is_delete) 1164 tomoyo_delete_domain(data); 1165 else if (is_select) 1166 domain = tomoyo_find_domain(data); 1167 else 1168 domain = tomoyo_assign_domain(data, false); 1169 head->w.domain = domain; 1170 return 0; 1171 } 1172 if (!domain) 1173 return -EINVAL; 1174 ns = domain->ns; 1175 if (sscanf(data, "use_profile %u", &profile) == 1 1176 && profile < TOMOYO_MAX_PROFILES) { 1177 if (!tomoyo_policy_loaded || ns->profile_ptr[profile]) 1178 domain->profile = (u8) profile; 1179 return 0; 1180 } 1181 if (sscanf(data, "use_group %u\n", &profile) == 1 1182 && profile < TOMOYO_MAX_ACL_GROUPS) { 1183 if (!is_delete) 1184 domain->group = (u8) profile; 1185 return 0; 1186 } 1187 for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) { 1188 const char *cp = tomoyo_dif[profile]; 1189 if (strncmp(data, cp, strlen(cp) - 1)) 1190 continue; 1191 domain->flags[profile] = !is_delete; 1192 return 0; 1193 } 1194 return tomoyo_write_domain2(ns, &domain->acl_info_list, data, 1195 is_delete); 1196 } 1197 1198 /** 1199 * tomoyo_print_condition - Print condition part. 1200 * 1201 * @head: Pointer to "struct tomoyo_io_buffer". 1202 * @cond: Pointer to "struct tomoyo_condition". 1203 * 1204 * Returns true on success, false otherwise. 1205 */ 1206 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head, 1207 const struct tomoyo_condition *cond) 1208 { 1209 switch (head->r.cond_step) { 1210 case 0: 1211 head->r.cond_index = 0; 1212 head->r.cond_step++; 1213 if (cond->transit) { 1214 tomoyo_set_space(head); 1215 tomoyo_set_string(head, cond->transit->name); 1216 } 1217 /* fall through */ 1218 case 1: 1219 { 1220 const u16 condc = cond->condc; 1221 const struct tomoyo_condition_element *condp = 1222 (typeof(condp)) (cond + 1); 1223 const struct tomoyo_number_union *numbers_p = 1224 (typeof(numbers_p)) (condp + condc); 1225 const struct tomoyo_name_union *names_p = 1226 (typeof(names_p)) 1227 (numbers_p + cond->numbers_count); 1228 const struct tomoyo_argv *argv = 1229 (typeof(argv)) (names_p + cond->names_count); 1230 const struct tomoyo_envp *envp = 1231 (typeof(envp)) (argv + cond->argc); 1232 u16 skip; 1233 for (skip = 0; skip < head->r.cond_index; skip++) { 1234 const u8 left = condp->left; 1235 const u8 right = condp->right; 1236 condp++; 1237 switch (left) { 1238 case TOMOYO_ARGV_ENTRY: 1239 argv++; 1240 continue; 1241 case TOMOYO_ENVP_ENTRY: 1242 envp++; 1243 continue; 1244 case TOMOYO_NUMBER_UNION: 1245 numbers_p++; 1246 break; 1247 } 1248 switch (right) { 1249 case TOMOYO_NAME_UNION: 1250 names_p++; 1251 break; 1252 case TOMOYO_NUMBER_UNION: 1253 numbers_p++; 1254 break; 1255 } 1256 } 1257 while (head->r.cond_index < condc) { 1258 const u8 match = condp->equals; 1259 const u8 left = condp->left; 1260 const u8 right = condp->right; 1261 if (!tomoyo_flush(head)) 1262 return false; 1263 condp++; 1264 head->r.cond_index++; 1265 tomoyo_set_space(head); 1266 switch (left) { 1267 case TOMOYO_ARGV_ENTRY: 1268 tomoyo_io_printf(head, 1269 "exec.argv[%lu]%s=\"", 1270 argv->index, argv-> 1271 is_not ? "!" : ""); 1272 tomoyo_set_string(head, 1273 argv->value->name); 1274 tomoyo_set_string(head, "\""); 1275 argv++; 1276 continue; 1277 case TOMOYO_ENVP_ENTRY: 1278 tomoyo_set_string(head, 1279 "exec.envp[\""); 1280 tomoyo_set_string(head, 1281 envp->name->name); 1282 tomoyo_io_printf(head, "\"]%s=", envp-> 1283 is_not ? "!" : ""); 1284 if (envp->value) { 1285 tomoyo_set_string(head, "\""); 1286 tomoyo_set_string(head, envp-> 1287 value->name); 1288 tomoyo_set_string(head, "\""); 1289 } else { 1290 tomoyo_set_string(head, 1291 "NULL"); 1292 } 1293 envp++; 1294 continue; 1295 case TOMOYO_NUMBER_UNION: 1296 tomoyo_print_number_union_nospace 1297 (head, numbers_p++); 1298 break; 1299 default: 1300 tomoyo_set_string(head, 1301 tomoyo_condition_keyword[left]); 1302 break; 1303 } 1304 tomoyo_set_string(head, match ? "=" : "!="); 1305 switch (right) { 1306 case TOMOYO_NAME_UNION: 1307 tomoyo_print_name_union_quoted 1308 (head, names_p++); 1309 break; 1310 case TOMOYO_NUMBER_UNION: 1311 tomoyo_print_number_union_nospace 1312 (head, numbers_p++); 1313 break; 1314 default: 1315 tomoyo_set_string(head, 1316 tomoyo_condition_keyword[right]); 1317 break; 1318 } 1319 } 1320 } 1321 head->r.cond_step++; 1322 /* fall through */ 1323 case 2: 1324 if (!tomoyo_flush(head)) 1325 break; 1326 head->r.cond_step++; 1327 /* fall through */ 1328 case 3: 1329 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO) 1330 tomoyo_io_printf(head, " grant_log=%s", 1331 tomoyo_yesno(cond->grant_log == 1332 TOMOYO_GRANTLOG_YES)); 1333 tomoyo_set_lf(head); 1334 return true; 1335 } 1336 return false; 1337 } 1338 1339 /** 1340 * tomoyo_set_group - Print "acl_group " header keyword and category name. 1341 * 1342 * @head: Pointer to "struct tomoyo_io_buffer". 1343 * @category: Category name. 1344 * 1345 * Returns nothing. 1346 */ 1347 static void tomoyo_set_group(struct tomoyo_io_buffer *head, 1348 const char *category) 1349 { 1350 if (head->type == TOMOYO_EXCEPTIONPOLICY) { 1351 tomoyo_print_namespace(head); 1352 tomoyo_io_printf(head, "acl_group %u ", 1353 head->r.acl_group_index); 1354 } 1355 tomoyo_set_string(head, category); 1356 } 1357 1358 /** 1359 * tomoyo_print_entry - Print an ACL entry. 1360 * 1361 * @head: Pointer to "struct tomoyo_io_buffer". 1362 * @acl: Pointer to an ACL entry. 1363 * 1364 * Returns true on success, false otherwise. 1365 */ 1366 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, 1367 struct tomoyo_acl_info *acl) 1368 { 1369 const u8 acl_type = acl->type; 1370 bool first = true; 1371 u8 bit; 1372 1373 if (head->r.print_cond_part) 1374 goto print_cond_part; 1375 if (acl->is_deleted) 1376 return true; 1377 if (!tomoyo_flush(head)) 1378 return false; 1379 else if (acl_type == TOMOYO_TYPE_PATH_ACL) { 1380 struct tomoyo_path_acl *ptr = 1381 container_of(acl, typeof(*ptr), head); 1382 const u16 perm = ptr->perm; 1383 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { 1384 if (!(perm & (1 << bit))) 1385 continue; 1386 if (head->r.print_transition_related_only && 1387 bit != TOMOYO_TYPE_EXECUTE) 1388 continue; 1389 if (first) { 1390 tomoyo_set_group(head, "file "); 1391 first = false; 1392 } else { 1393 tomoyo_set_slash(head); 1394 } 1395 tomoyo_set_string(head, tomoyo_path_keyword[bit]); 1396 } 1397 if (first) 1398 return true; 1399 tomoyo_print_name_union(head, &ptr->name); 1400 } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) { 1401 struct tomoyo_task_acl *ptr = 1402 container_of(acl, typeof(*ptr), head); 1403 tomoyo_set_group(head, "task "); 1404 tomoyo_set_string(head, "manual_domain_transition "); 1405 tomoyo_set_string(head, ptr->domainname->name); 1406 } else if (head->r.print_transition_related_only) { 1407 return true; 1408 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) { 1409 struct tomoyo_path2_acl *ptr = 1410 container_of(acl, typeof(*ptr), head); 1411 const u8 perm = ptr->perm; 1412 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) { 1413 if (!(perm & (1 << bit))) 1414 continue; 1415 if (first) { 1416 tomoyo_set_group(head, "file "); 1417 first = false; 1418 } else { 1419 tomoyo_set_slash(head); 1420 } 1421 tomoyo_set_string(head, tomoyo_mac_keywords 1422 [tomoyo_pp2mac[bit]]); 1423 } 1424 if (first) 1425 return true; 1426 tomoyo_print_name_union(head, &ptr->name1); 1427 tomoyo_print_name_union(head, &ptr->name2); 1428 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) { 1429 struct tomoyo_path_number_acl *ptr = 1430 container_of(acl, typeof(*ptr), head); 1431 const u8 perm = ptr->perm; 1432 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) { 1433 if (!(perm & (1 << bit))) 1434 continue; 1435 if (first) { 1436 tomoyo_set_group(head, "file "); 1437 first = false; 1438 } else { 1439 tomoyo_set_slash(head); 1440 } 1441 tomoyo_set_string(head, tomoyo_mac_keywords 1442 [tomoyo_pn2mac[bit]]); 1443 } 1444 if (first) 1445 return true; 1446 tomoyo_print_name_union(head, &ptr->name); 1447 tomoyo_print_number_union(head, &ptr->number); 1448 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) { 1449 struct tomoyo_mkdev_acl *ptr = 1450 container_of(acl, typeof(*ptr), head); 1451 const u8 perm = ptr->perm; 1452 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) { 1453 if (!(perm & (1 << bit))) 1454 continue; 1455 if (first) { 1456 tomoyo_set_group(head, "file "); 1457 first = false; 1458 } else { 1459 tomoyo_set_slash(head); 1460 } 1461 tomoyo_set_string(head, tomoyo_mac_keywords 1462 [tomoyo_pnnn2mac[bit]]); 1463 } 1464 if (first) 1465 return true; 1466 tomoyo_print_name_union(head, &ptr->name); 1467 tomoyo_print_number_union(head, &ptr->mode); 1468 tomoyo_print_number_union(head, &ptr->major); 1469 tomoyo_print_number_union(head, &ptr->minor); 1470 } else if (acl_type == TOMOYO_TYPE_INET_ACL) { 1471 struct tomoyo_inet_acl *ptr = 1472 container_of(acl, typeof(*ptr), head); 1473 const u8 perm = ptr->perm; 1474 1475 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) { 1476 if (!(perm & (1 << bit))) 1477 continue; 1478 if (first) { 1479 tomoyo_set_group(head, "network inet "); 1480 tomoyo_set_string(head, tomoyo_proto_keyword 1481 [ptr->protocol]); 1482 tomoyo_set_space(head); 1483 first = false; 1484 } else { 1485 tomoyo_set_slash(head); 1486 } 1487 tomoyo_set_string(head, tomoyo_socket_keyword[bit]); 1488 } 1489 if (first) 1490 return true; 1491 tomoyo_set_space(head); 1492 if (ptr->address.group) { 1493 tomoyo_set_string(head, "@"); 1494 tomoyo_set_string(head, ptr->address.group->group_name 1495 ->name); 1496 } else { 1497 char buf[128]; 1498 tomoyo_print_ip(buf, sizeof(buf), &ptr->address); 1499 tomoyo_io_printf(head, "%s", buf); 1500 } 1501 tomoyo_print_number_union(head, &ptr->port); 1502 } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) { 1503 struct tomoyo_unix_acl *ptr = 1504 container_of(acl, typeof(*ptr), head); 1505 const u8 perm = ptr->perm; 1506 1507 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) { 1508 if (!(perm & (1 << bit))) 1509 continue; 1510 if (first) { 1511 tomoyo_set_group(head, "network unix "); 1512 tomoyo_set_string(head, tomoyo_proto_keyword 1513 [ptr->protocol]); 1514 tomoyo_set_space(head); 1515 first = false; 1516 } else { 1517 tomoyo_set_slash(head); 1518 } 1519 tomoyo_set_string(head, tomoyo_socket_keyword[bit]); 1520 } 1521 if (first) 1522 return true; 1523 tomoyo_print_name_union(head, &ptr->name); 1524 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) { 1525 struct tomoyo_mount_acl *ptr = 1526 container_of(acl, typeof(*ptr), head); 1527 tomoyo_set_group(head, "file mount"); 1528 tomoyo_print_name_union(head, &ptr->dev_name); 1529 tomoyo_print_name_union(head, &ptr->dir_name); 1530 tomoyo_print_name_union(head, &ptr->fs_type); 1531 tomoyo_print_number_union(head, &ptr->flags); 1532 } else if (acl_type == TOMOYO_TYPE_ENV_ACL) { 1533 struct tomoyo_env_acl *ptr = 1534 container_of(acl, typeof(*ptr), head); 1535 1536 tomoyo_set_group(head, "misc env "); 1537 tomoyo_set_string(head, ptr->env->name); 1538 } 1539 if (acl->cond) { 1540 head->r.print_cond_part = true; 1541 head->r.cond_step = 0; 1542 if (!tomoyo_flush(head)) 1543 return false; 1544 print_cond_part: 1545 if (!tomoyo_print_condition(head, acl->cond)) 1546 return false; 1547 head->r.print_cond_part = false; 1548 } else { 1549 tomoyo_set_lf(head); 1550 } 1551 return true; 1552 } 1553 1554 /** 1555 * tomoyo_read_domain2 - Read domain policy. 1556 * 1557 * @head: Pointer to "struct tomoyo_io_buffer". 1558 * @list: Pointer to "struct list_head". 1559 * 1560 * Caller holds tomoyo_read_lock(). 1561 * 1562 * Returns true on success, false otherwise. 1563 */ 1564 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head, 1565 struct list_head *list) 1566 { 1567 list_for_each_cookie(head->r.acl, list) { 1568 struct tomoyo_acl_info *ptr = 1569 list_entry(head->r.acl, typeof(*ptr), list); 1570 if (!tomoyo_print_entry(head, ptr)) 1571 return false; 1572 } 1573 head->r.acl = NULL; 1574 return true; 1575 } 1576 1577 /** 1578 * tomoyo_read_domain - Read domain policy. 1579 * 1580 * @head: Pointer to "struct tomoyo_io_buffer". 1581 * 1582 * Caller holds tomoyo_read_lock(). 1583 */ 1584 static void tomoyo_read_domain(struct tomoyo_io_buffer *head) 1585 { 1586 if (head->r.eof) 1587 return; 1588 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) { 1589 struct tomoyo_domain_info *domain = 1590 list_entry(head->r.domain, typeof(*domain), list); 1591 switch (head->r.step) { 1592 u8 i; 1593 case 0: 1594 if (domain->is_deleted && 1595 !head->r.print_this_domain_only) 1596 continue; 1597 /* Print domainname and flags. */ 1598 tomoyo_set_string(head, domain->domainname->name); 1599 tomoyo_set_lf(head); 1600 tomoyo_io_printf(head, "use_profile %u\n", 1601 domain->profile); 1602 tomoyo_io_printf(head, "use_group %u\n", 1603 domain->group); 1604 for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++) 1605 if (domain->flags[i]) 1606 tomoyo_set_string(head, tomoyo_dif[i]); 1607 head->r.step++; 1608 tomoyo_set_lf(head); 1609 /* fall through */ 1610 case 1: 1611 if (!tomoyo_read_domain2(head, &domain->acl_info_list)) 1612 return; 1613 head->r.step++; 1614 if (!tomoyo_set_lf(head)) 1615 return; 1616 /* fall through */ 1617 case 2: 1618 head->r.step = 0; 1619 if (head->r.print_this_domain_only) 1620 goto done; 1621 } 1622 } 1623 done: 1624 head->r.eof = true; 1625 } 1626 1627 /** 1628 * tomoyo_write_pid: Specify PID to obtain domainname. 1629 * 1630 * @head: Pointer to "struct tomoyo_io_buffer". 1631 * 1632 * Returns 0. 1633 */ 1634 static int tomoyo_write_pid(struct tomoyo_io_buffer *head) 1635 { 1636 head->r.eof = false; 1637 return 0; 1638 } 1639 1640 /** 1641 * tomoyo_read_pid - Get domainname of the specified PID. 1642 * 1643 * @head: Pointer to "struct tomoyo_io_buffer". 1644 * 1645 * Returns the domainname which the specified PID is in on success, 1646 * empty string otherwise. 1647 * The PID is specified by tomoyo_write_pid() so that the user can obtain 1648 * using read()/write() interface rather than sysctl() interface. 1649 */ 1650 static void tomoyo_read_pid(struct tomoyo_io_buffer *head) 1651 { 1652 char *buf = head->write_buf; 1653 bool global_pid = false; 1654 unsigned int pid; 1655 struct task_struct *p; 1656 struct tomoyo_domain_info *domain = NULL; 1657 1658 /* Accessing write_buf is safe because head->io_sem is held. */ 1659 if (!buf) { 1660 head->r.eof = true; 1661 return; /* Do nothing if open(O_RDONLY). */ 1662 } 1663 if (head->r.w_pos || head->r.eof) 1664 return; 1665 head->r.eof = true; 1666 if (tomoyo_str_starts(&buf, "global-pid ")) 1667 global_pid = true; 1668 pid = (unsigned int) simple_strtoul(buf, NULL, 10); 1669 rcu_read_lock(); 1670 if (global_pid) 1671 p = find_task_by_pid_ns(pid, &init_pid_ns); 1672 else 1673 p = find_task_by_vpid(pid); 1674 if (p) 1675 domain = tomoyo_real_domain(p); 1676 rcu_read_unlock(); 1677 if (!domain) 1678 return; 1679 tomoyo_io_printf(head, "%u %u ", pid, domain->profile); 1680 tomoyo_set_string(head, domain->domainname->name); 1681 } 1682 1683 /* String table for domain transition control keywords. */ 1684 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = { 1685 [TOMOYO_TRANSITION_CONTROL_NO_RESET] = "no_reset_domain ", 1686 [TOMOYO_TRANSITION_CONTROL_RESET] = "reset_domain ", 1687 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ", 1688 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ", 1689 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ", 1690 [TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain ", 1691 }; 1692 1693 /* String table for grouping keywords. */ 1694 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = { 1695 [TOMOYO_PATH_GROUP] = "path_group ", 1696 [TOMOYO_NUMBER_GROUP] = "number_group ", 1697 [TOMOYO_ADDRESS_GROUP] = "address_group ", 1698 }; 1699 1700 /** 1701 * tomoyo_write_exception - Write exception policy. 1702 * 1703 * @head: Pointer to "struct tomoyo_io_buffer". 1704 * 1705 * Returns 0 on success, negative value otherwise. 1706 * 1707 * Caller holds tomoyo_read_lock(). 1708 */ 1709 static int tomoyo_write_exception(struct tomoyo_io_buffer *head) 1710 { 1711 const bool is_delete = head->w.is_delete; 1712 struct tomoyo_acl_param param = { 1713 .ns = head->w.ns, 1714 .is_delete = is_delete, 1715 .data = head->write_buf, 1716 }; 1717 u8 i; 1718 if (tomoyo_str_starts(¶m.data, "aggregator ")) 1719 return tomoyo_write_aggregator(¶m); 1720 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++) 1721 if (tomoyo_str_starts(¶m.data, tomoyo_transition_type[i])) 1722 return tomoyo_write_transition_control(¶m, i); 1723 for (i = 0; i < TOMOYO_MAX_GROUP; i++) 1724 if (tomoyo_str_starts(¶m.data, tomoyo_group_name[i])) 1725 return tomoyo_write_group(¶m, i); 1726 if (tomoyo_str_starts(¶m.data, "acl_group ")) { 1727 unsigned int group; 1728 char *data; 1729 group = simple_strtoul(param.data, &data, 10); 1730 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ') 1731 return tomoyo_write_domain2 1732 (head->w.ns, &head->w.ns->acl_group[group], 1733 data, is_delete); 1734 } 1735 return -EINVAL; 1736 } 1737 1738 /** 1739 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list. 1740 * 1741 * @head: Pointer to "struct tomoyo_io_buffer". 1742 * @idx: Index number. 1743 * 1744 * Returns true on success, false otherwise. 1745 * 1746 * Caller holds tomoyo_read_lock(). 1747 */ 1748 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx) 1749 { 1750 struct tomoyo_policy_namespace *ns = 1751 container_of(head->r.ns, typeof(*ns), namespace_list); 1752 struct list_head *list = &ns->group_list[idx]; 1753 list_for_each_cookie(head->r.group, list) { 1754 struct tomoyo_group *group = 1755 list_entry(head->r.group, typeof(*group), head.list); 1756 list_for_each_cookie(head->r.acl, &group->member_list) { 1757 struct tomoyo_acl_head *ptr = 1758 list_entry(head->r.acl, typeof(*ptr), list); 1759 if (ptr->is_deleted) 1760 continue; 1761 if (!tomoyo_flush(head)) 1762 return false; 1763 tomoyo_print_namespace(head); 1764 tomoyo_set_string(head, tomoyo_group_name[idx]); 1765 tomoyo_set_string(head, group->group_name->name); 1766 if (idx == TOMOYO_PATH_GROUP) { 1767 tomoyo_set_space(head); 1768 tomoyo_set_string(head, container_of 1769 (ptr, struct tomoyo_path_group, 1770 head)->member_name->name); 1771 } else if (idx == TOMOYO_NUMBER_GROUP) { 1772 tomoyo_print_number_union(head, &container_of 1773 (ptr, 1774 struct tomoyo_number_group, 1775 head)->number); 1776 } else if (idx == TOMOYO_ADDRESS_GROUP) { 1777 char buffer[128]; 1778 1779 struct tomoyo_address_group *member = 1780 container_of(ptr, typeof(*member), 1781 head); 1782 tomoyo_print_ip(buffer, sizeof(buffer), 1783 &member->address); 1784 tomoyo_io_printf(head, " %s", buffer); 1785 } 1786 tomoyo_set_lf(head); 1787 } 1788 head->r.acl = NULL; 1789 } 1790 head->r.group = NULL; 1791 return true; 1792 } 1793 1794 /** 1795 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list. 1796 * 1797 * @head: Pointer to "struct tomoyo_io_buffer". 1798 * @idx: Index number. 1799 * 1800 * Returns true on success, false otherwise. 1801 * 1802 * Caller holds tomoyo_read_lock(). 1803 */ 1804 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx) 1805 { 1806 struct tomoyo_policy_namespace *ns = 1807 container_of(head->r.ns, typeof(*ns), namespace_list); 1808 struct list_head *list = &ns->policy_list[idx]; 1809 list_for_each_cookie(head->r.acl, list) { 1810 struct tomoyo_acl_head *acl = 1811 container_of(head->r.acl, typeof(*acl), list); 1812 if (acl->is_deleted) 1813 continue; 1814 if (!tomoyo_flush(head)) 1815 return false; 1816 switch (idx) { 1817 case TOMOYO_ID_TRANSITION_CONTROL: 1818 { 1819 struct tomoyo_transition_control *ptr = 1820 container_of(acl, typeof(*ptr), head); 1821 tomoyo_print_namespace(head); 1822 tomoyo_set_string(head, tomoyo_transition_type 1823 [ptr->type]); 1824 tomoyo_set_string(head, ptr->program ? 1825 ptr->program->name : "any"); 1826 tomoyo_set_string(head, " from "); 1827 tomoyo_set_string(head, ptr->domainname ? 1828 ptr->domainname->name : 1829 "any"); 1830 } 1831 break; 1832 case TOMOYO_ID_AGGREGATOR: 1833 { 1834 struct tomoyo_aggregator *ptr = 1835 container_of(acl, typeof(*ptr), head); 1836 tomoyo_print_namespace(head); 1837 tomoyo_set_string(head, "aggregator "); 1838 tomoyo_set_string(head, 1839 ptr->original_name->name); 1840 tomoyo_set_space(head); 1841 tomoyo_set_string(head, 1842 ptr->aggregated_name->name); 1843 } 1844 break; 1845 default: 1846 continue; 1847 } 1848 tomoyo_set_lf(head); 1849 } 1850 head->r.acl = NULL; 1851 return true; 1852 } 1853 1854 /** 1855 * tomoyo_read_exception - Read exception policy. 1856 * 1857 * @head: Pointer to "struct tomoyo_io_buffer". 1858 * 1859 * Caller holds tomoyo_read_lock(). 1860 */ 1861 static void tomoyo_read_exception(struct tomoyo_io_buffer *head) 1862 { 1863 struct tomoyo_policy_namespace *ns = 1864 container_of(head->r.ns, typeof(*ns), namespace_list); 1865 if (head->r.eof) 1866 return; 1867 while (head->r.step < TOMOYO_MAX_POLICY && 1868 tomoyo_read_policy(head, head->r.step)) 1869 head->r.step++; 1870 if (head->r.step < TOMOYO_MAX_POLICY) 1871 return; 1872 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP && 1873 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY)) 1874 head->r.step++; 1875 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP) 1876 return; 1877 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP 1878 + TOMOYO_MAX_ACL_GROUPS) { 1879 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY 1880 - TOMOYO_MAX_GROUP; 1881 if (!tomoyo_read_domain2(head, &ns->acl_group 1882 [head->r.acl_group_index])) 1883 return; 1884 head->r.step++; 1885 } 1886 head->r.eof = true; 1887 } 1888 1889 /* Wait queue for kernel -> userspace notification. */ 1890 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait); 1891 /* Wait queue for userspace -> kernel notification. */ 1892 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait); 1893 1894 /* Structure for query. */ 1895 struct tomoyo_query { 1896 struct list_head list; 1897 char *query; 1898 size_t query_len; 1899 unsigned int serial; 1900 u8 timer; 1901 u8 answer; 1902 u8 retry; 1903 }; 1904 1905 /* The list for "struct tomoyo_query". */ 1906 static LIST_HEAD(tomoyo_query_list); 1907 1908 /* Lock for manipulating tomoyo_query_list. */ 1909 static DEFINE_SPINLOCK(tomoyo_query_list_lock); 1910 1911 /* 1912 * Number of "struct file" referring /sys/kernel/security/tomoyo/query 1913 * interface. 1914 */ 1915 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0); 1916 1917 /** 1918 * tomoyo_truncate - Truncate a line. 1919 * 1920 * @str: String to truncate. 1921 * 1922 * Returns length of truncated @str. 1923 */ 1924 static int tomoyo_truncate(char *str) 1925 { 1926 char *start = str; 1927 while (*(unsigned char *) str > (unsigned char) ' ') 1928 str++; 1929 *str = '\0'; 1930 return strlen(start) + 1; 1931 } 1932 1933 /** 1934 * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode. 1935 * 1936 * @domain: Pointer to "struct tomoyo_domain_info". 1937 * @header: Lines containing ACL. 1938 * 1939 * Returns nothing. 1940 */ 1941 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header) 1942 { 1943 char *buffer; 1944 char *realpath = NULL; 1945 char *argv0 = NULL; 1946 char *symlink = NULL; 1947 char *cp = strchr(header, '\n'); 1948 int len; 1949 if (!cp) 1950 return; 1951 cp = strchr(cp + 1, '\n'); 1952 if (!cp) 1953 return; 1954 *cp++ = '\0'; 1955 len = strlen(cp) + 1; 1956 /* strstr() will return NULL if ordering is wrong. */ 1957 if (*cp == 'f') { 1958 argv0 = strstr(header, " argv[]={ \""); 1959 if (argv0) { 1960 argv0 += 10; 1961 len += tomoyo_truncate(argv0) + 14; 1962 } 1963 realpath = strstr(header, " exec={ realpath=\""); 1964 if (realpath) { 1965 realpath += 8; 1966 len += tomoyo_truncate(realpath) + 6; 1967 } 1968 symlink = strstr(header, " symlink.target=\""); 1969 if (symlink) 1970 len += tomoyo_truncate(symlink + 1) + 1; 1971 } 1972 buffer = kmalloc(len, GFP_NOFS); 1973 if (!buffer) 1974 return; 1975 snprintf(buffer, len - 1, "%s", cp); 1976 if (realpath) 1977 tomoyo_addprintf(buffer, len, " exec.%s", realpath); 1978 if (argv0) 1979 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0); 1980 if (symlink) 1981 tomoyo_addprintf(buffer, len, "%s", symlink); 1982 tomoyo_normalize_line(buffer); 1983 if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer, 1984 false)) 1985 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES); 1986 kfree(buffer); 1987 } 1988 1989 /** 1990 * tomoyo_supervisor - Ask for the supervisor's decision. 1991 * 1992 * @r: Pointer to "struct tomoyo_request_info". 1993 * @fmt: The printf()'s format string, followed by parameters. 1994 * 1995 * Returns 0 if the supervisor decided to permit the access request which 1996 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the 1997 * supervisor decided to retry the access request which violated the policy in 1998 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise. 1999 */ 2000 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) 2001 { 2002 va_list args; 2003 int error; 2004 int len; 2005 static unsigned int tomoyo_serial; 2006 struct tomoyo_query entry = { }; 2007 bool quota_exceeded = false; 2008 va_start(args, fmt); 2009 len = vsnprintf((char *) &len, 1, fmt, args) + 1; 2010 va_end(args); 2011 /* Write /sys/kernel/security/tomoyo/audit. */ 2012 va_start(args, fmt); 2013 tomoyo_write_log2(r, len, fmt, args); 2014 va_end(args); 2015 /* Nothing more to do if granted. */ 2016 if (r->granted) 2017 return 0; 2018 if (r->mode) 2019 tomoyo_update_stat(r->mode); 2020 switch (r->mode) { 2021 case TOMOYO_CONFIG_ENFORCING: 2022 error = -EPERM; 2023 if (atomic_read(&tomoyo_query_observers)) 2024 break; 2025 goto out; 2026 case TOMOYO_CONFIG_LEARNING: 2027 error = 0; 2028 /* Check max_learning_entry parameter. */ 2029 if (tomoyo_domain_quota_is_ok(r)) 2030 break; 2031 /* fall through */ 2032 default: 2033 return 0; 2034 } 2035 /* Get message. */ 2036 va_start(args, fmt); 2037 entry.query = tomoyo_init_log(r, len, fmt, args); 2038 va_end(args); 2039 if (!entry.query) 2040 goto out; 2041 entry.query_len = strlen(entry.query) + 1; 2042 if (!error) { 2043 tomoyo_add_entry(r->domain, entry.query); 2044 goto out; 2045 } 2046 len = tomoyo_round2(entry.query_len); 2047 spin_lock(&tomoyo_query_list_lock); 2048 if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] && 2049 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len 2050 >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) { 2051 quota_exceeded = true; 2052 } else { 2053 entry.serial = tomoyo_serial++; 2054 entry.retry = r->retry; 2055 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len; 2056 list_add_tail(&entry.list, &tomoyo_query_list); 2057 } 2058 spin_unlock(&tomoyo_query_list_lock); 2059 if (quota_exceeded) 2060 goto out; 2061 /* Give 10 seconds for supervisor's opinion. */ 2062 while (entry.timer < 10) { 2063 wake_up_all(&tomoyo_query_wait); 2064 if (wait_event_interruptible_timeout 2065 (tomoyo_answer_wait, entry.answer || 2066 !atomic_read(&tomoyo_query_observers), HZ)) 2067 break; 2068 else 2069 entry.timer++; 2070 } 2071 spin_lock(&tomoyo_query_list_lock); 2072 list_del(&entry.list); 2073 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len; 2074 spin_unlock(&tomoyo_query_list_lock); 2075 switch (entry.answer) { 2076 case 3: /* Asked to retry by administrator. */ 2077 error = TOMOYO_RETRY_REQUEST; 2078 r->retry++; 2079 break; 2080 case 1: 2081 /* Granted by administrator. */ 2082 error = 0; 2083 break; 2084 default: 2085 /* Timed out or rejected by administrator. */ 2086 break; 2087 } 2088 out: 2089 kfree(entry.query); 2090 return error; 2091 } 2092 2093 /** 2094 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query. 2095 * 2096 * @file: Pointer to "struct file". 2097 * @wait: Pointer to "poll_table". 2098 * 2099 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. 2100 * 2101 * Waits for access requests which violated policy in enforcing mode. 2102 */ 2103 static int tomoyo_poll_query(struct file *file, poll_table *wait) 2104 { 2105 struct list_head *tmp; 2106 bool found = false; 2107 u8 i; 2108 for (i = 0; i < 2; i++) { 2109 spin_lock(&tomoyo_query_list_lock); 2110 list_for_each(tmp, &tomoyo_query_list) { 2111 struct tomoyo_query *ptr = 2112 list_entry(tmp, typeof(*ptr), list); 2113 if (ptr->answer) 2114 continue; 2115 found = true; 2116 break; 2117 } 2118 spin_unlock(&tomoyo_query_list_lock); 2119 if (found) 2120 return POLLIN | POLLRDNORM; 2121 if (i) 2122 break; 2123 poll_wait(file, &tomoyo_query_wait, wait); 2124 } 2125 return 0; 2126 } 2127 2128 /** 2129 * tomoyo_read_query - Read access requests which violated policy in enforcing mode. 2130 * 2131 * @head: Pointer to "struct tomoyo_io_buffer". 2132 */ 2133 static void tomoyo_read_query(struct tomoyo_io_buffer *head) 2134 { 2135 struct list_head *tmp; 2136 unsigned int pos = 0; 2137 size_t len = 0; 2138 char *buf; 2139 if (head->r.w_pos) 2140 return; 2141 if (head->read_buf) { 2142 kfree(head->read_buf); 2143 head->read_buf = NULL; 2144 } 2145 spin_lock(&tomoyo_query_list_lock); 2146 list_for_each(tmp, &tomoyo_query_list) { 2147 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2148 if (ptr->answer) 2149 continue; 2150 if (pos++ != head->r.query_index) 2151 continue; 2152 len = ptr->query_len; 2153 break; 2154 } 2155 spin_unlock(&tomoyo_query_list_lock); 2156 if (!len) { 2157 head->r.query_index = 0; 2158 return; 2159 } 2160 buf = kzalloc(len + 32, GFP_NOFS); 2161 if (!buf) 2162 return; 2163 pos = 0; 2164 spin_lock(&tomoyo_query_list_lock); 2165 list_for_each(tmp, &tomoyo_query_list) { 2166 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2167 if (ptr->answer) 2168 continue; 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 if (!ptr->answer) 2217 ptr->answer = answer; 2218 break; 2219 } 2220 spin_unlock(&tomoyo_query_list_lock); 2221 return 0; 2222 } 2223 2224 /** 2225 * tomoyo_read_version: Get version. 2226 * 2227 * @head: Pointer to "struct tomoyo_io_buffer". 2228 * 2229 * Returns version information. 2230 */ 2231 static void tomoyo_read_version(struct tomoyo_io_buffer *head) 2232 { 2233 if (!head->r.eof) { 2234 tomoyo_io_printf(head, "2.5.0"); 2235 head->r.eof = true; 2236 } 2237 } 2238 2239 /* String table for /sys/kernel/security/tomoyo/stat interface. */ 2240 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = { 2241 [TOMOYO_STAT_POLICY_UPDATES] = "update:", 2242 [TOMOYO_STAT_POLICY_LEARNING] = "violation in learning mode:", 2243 [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:", 2244 [TOMOYO_STAT_POLICY_ENFORCING] = "violation in enforcing mode:", 2245 }; 2246 2247 /* String table for /sys/kernel/security/tomoyo/stat interface. */ 2248 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = { 2249 [TOMOYO_MEMORY_POLICY] = "policy:", 2250 [TOMOYO_MEMORY_AUDIT] = "audit log:", 2251 [TOMOYO_MEMORY_QUERY] = "query message:", 2252 }; 2253 2254 /* Timestamp counter for last updated. */ 2255 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT]; 2256 /* Counter for number of updates. */ 2257 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT]; 2258 2259 /** 2260 * tomoyo_update_stat - Update statistic counters. 2261 * 2262 * @index: Index for policy type. 2263 * 2264 * Returns nothing. 2265 */ 2266 void tomoyo_update_stat(const u8 index) 2267 { 2268 struct timeval tv; 2269 do_gettimeofday(&tv); 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] = tv.tv_sec; 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". 2451 * 2452 * Waits for read readiness. 2453 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and 2454 * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd. 2455 */ 2456 int tomoyo_poll_control(struct file *file, poll_table *wait) 2457 { 2458 struct tomoyo_io_buffer *head = file->private_data; 2459 if (!head->poll) 2460 return -ENOSYS; 2461 return head->poll(file, wait); 2462 } 2463 2464 /** 2465 * tomoyo_set_namespace_cursor - Set namespace to read. 2466 * 2467 * @head: Pointer to "struct tomoyo_io_buffer". 2468 * 2469 * Returns nothing. 2470 */ 2471 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head) 2472 { 2473 struct list_head *ns; 2474 if (head->type != TOMOYO_EXCEPTIONPOLICY && 2475 head->type != TOMOYO_PROFILE) 2476 return; 2477 /* 2478 * If this is the first read, or reading previous namespace finished 2479 * and has more namespaces to read, update the namespace cursor. 2480 */ 2481 ns = head->r.ns; 2482 if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) { 2483 /* Clearing is OK because tomoyo_flush() returned true. */ 2484 memset(&head->r, 0, sizeof(head->r)); 2485 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next; 2486 } 2487 } 2488 2489 /** 2490 * tomoyo_has_more_namespace - Check for unread namespaces. 2491 * 2492 * @head: Pointer to "struct tomoyo_io_buffer". 2493 * 2494 * Returns true if we have more entries to print, false otherwise. 2495 */ 2496 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head) 2497 { 2498 return (head->type == TOMOYO_EXCEPTIONPOLICY || 2499 head->type == TOMOYO_PROFILE) && head->r.eof && 2500 head->r.ns->next != &tomoyo_namespace_list; 2501 } 2502 2503 /** 2504 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. 2505 * 2506 * @head: Pointer to "struct tomoyo_io_buffer". 2507 * @buffer: Poiner to buffer to write to. 2508 * @buffer_len: Size of @buffer. 2509 * 2510 * Returns bytes read on success, negative value otherwise. 2511 */ 2512 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer, 2513 const int buffer_len) 2514 { 2515 int len; 2516 int idx; 2517 2518 if (!head->read) 2519 return -ENOSYS; 2520 if (mutex_lock_interruptible(&head->io_sem)) 2521 return -EINTR; 2522 head->read_user_buf = buffer; 2523 head->read_user_buf_avail = buffer_len; 2524 idx = tomoyo_read_lock(); 2525 if (tomoyo_flush(head)) 2526 /* Call the policy handler. */ 2527 do { 2528 tomoyo_set_namespace_cursor(head); 2529 head->read(head); 2530 } while (tomoyo_flush(head) && 2531 tomoyo_has_more_namespace(head)); 2532 tomoyo_read_unlock(idx); 2533 len = head->read_user_buf - buffer; 2534 mutex_unlock(&head->io_sem); 2535 return len; 2536 } 2537 2538 /** 2539 * tomoyo_parse_policy - Parse a policy line. 2540 * 2541 * @head: Poiter to "struct tomoyo_io_buffer". 2542 * @line: Line to parse. 2543 * 2544 * Returns 0 on success, negative value otherwise. 2545 * 2546 * Caller holds tomoyo_read_lock(). 2547 */ 2548 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line) 2549 { 2550 /* Delete request? */ 2551 head->w.is_delete = !strncmp(line, "delete ", 7); 2552 if (head->w.is_delete) 2553 memmove(line, line + 7, strlen(line + 7) + 1); 2554 /* Selecting namespace to update. */ 2555 if (head->type == TOMOYO_EXCEPTIONPOLICY || 2556 head->type == TOMOYO_PROFILE) { 2557 if (*line == '<') { 2558 char *cp = strchr(line, ' '); 2559 if (cp) { 2560 *cp++ = '\0'; 2561 head->w.ns = tomoyo_assign_namespace(line); 2562 memmove(line, cp, strlen(cp) + 1); 2563 } else 2564 head->w.ns = NULL; 2565 } else 2566 head->w.ns = &tomoyo_kernel_namespace; 2567 /* Don't allow updating if namespace is invalid. */ 2568 if (!head->w.ns) 2569 return -ENOENT; 2570 } 2571 /* Do the update. */ 2572 return head->write(head); 2573 } 2574 2575 /** 2576 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. 2577 * 2578 * @head: Pointer to "struct tomoyo_io_buffer". 2579 * @buffer: Pointer to buffer to read from. 2580 * @buffer_len: Size of @buffer. 2581 * 2582 * Returns @buffer_len on success, negative value otherwise. 2583 */ 2584 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head, 2585 const char __user *buffer, const int buffer_len) 2586 { 2587 int error = buffer_len; 2588 size_t avail_len = buffer_len; 2589 char *cp0 = head->write_buf; 2590 int idx; 2591 if (!head->write) 2592 return -ENOSYS; 2593 if (!access_ok(VERIFY_READ, buffer, buffer_len)) 2594 return -EFAULT; 2595 if (mutex_lock_interruptible(&head->io_sem)) 2596 return -EINTR; 2597 head->read_user_buf_avail = 0; 2598 idx = tomoyo_read_lock(); 2599 /* Read a line and dispatch it to the policy handler. */ 2600 while (avail_len > 0) { 2601 char c; 2602 if (head->w.avail >= head->writebuf_size - 1) { 2603 const int len = head->writebuf_size * 2; 2604 char *cp = kzalloc(len, GFP_NOFS); 2605 if (!cp) { 2606 error = -ENOMEM; 2607 break; 2608 } 2609 memmove(cp, cp0, head->w.avail); 2610 kfree(cp0); 2611 head->write_buf = cp; 2612 cp0 = cp; 2613 head->writebuf_size = len; 2614 } 2615 if (get_user(c, buffer)) { 2616 error = -EFAULT; 2617 break; 2618 } 2619 buffer++; 2620 avail_len--; 2621 cp0[head->w.avail++] = c; 2622 if (c != '\n') 2623 continue; 2624 cp0[head->w.avail - 1] = '\0'; 2625 head->w.avail = 0; 2626 tomoyo_normalize_line(cp0); 2627 if (!strcmp(cp0, "reset")) { 2628 head->w.ns = &tomoyo_kernel_namespace; 2629 head->w.domain = NULL; 2630 memset(&head->r, 0, sizeof(head->r)); 2631 continue; 2632 } 2633 /* Don't allow updating policies by non manager programs. */ 2634 switch (head->type) { 2635 case TOMOYO_PROCESS_STATUS: 2636 /* This does not write anything. */ 2637 break; 2638 case TOMOYO_DOMAINPOLICY: 2639 if (tomoyo_select_domain(head, cp0)) 2640 continue; 2641 /* fall through */ 2642 case TOMOYO_EXCEPTIONPOLICY: 2643 if (!strcmp(cp0, "select transition_only")) { 2644 head->r.print_transition_related_only = true; 2645 continue; 2646 } 2647 /* fall through */ 2648 default: 2649 if (!tomoyo_manager()) { 2650 error = -EPERM; 2651 goto out; 2652 } 2653 } 2654 switch (tomoyo_parse_policy(head, cp0)) { 2655 case -EPERM: 2656 error = -EPERM; 2657 goto out; 2658 case 0: 2659 switch (head->type) { 2660 case TOMOYO_DOMAINPOLICY: 2661 case TOMOYO_EXCEPTIONPOLICY: 2662 case TOMOYO_STAT: 2663 case TOMOYO_PROFILE: 2664 case TOMOYO_MANAGER: 2665 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES); 2666 break; 2667 default: 2668 break; 2669 } 2670 break; 2671 } 2672 } 2673 out: 2674 tomoyo_read_unlock(idx); 2675 mutex_unlock(&head->io_sem); 2676 return error; 2677 } 2678 2679 /** 2680 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. 2681 * 2682 * @head: Pointer to "struct tomoyo_io_buffer". 2683 * 2684 * Returns 0. 2685 */ 2686 int tomoyo_close_control(struct tomoyo_io_buffer *head) 2687 { 2688 /* 2689 * If the file is /sys/kernel/security/tomoyo/query , decrement the 2690 * observer counter. 2691 */ 2692 if (head->type == TOMOYO_QUERY && 2693 atomic_dec_and_test(&tomoyo_query_observers)) 2694 wake_up_all(&tomoyo_answer_wait); 2695 tomoyo_notify_gc(head, false); 2696 return 0; 2697 } 2698 2699 /** 2700 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined. 2701 */ 2702 void tomoyo_check_profile(void) 2703 { 2704 struct tomoyo_domain_info *domain; 2705 const int idx = tomoyo_read_lock(); 2706 tomoyo_policy_loaded = true; 2707 printk(KERN_INFO "TOMOYO: 2.5.0\n"); 2708 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 2709 const u8 profile = domain->profile; 2710 const struct tomoyo_policy_namespace *ns = domain->ns; 2711 if (ns->profile_version != 20110903) 2712 printk(KERN_ERR 2713 "Profile version %u is not supported.\n", 2714 ns->profile_version); 2715 else if (!ns->profile_ptr[profile]) 2716 printk(KERN_ERR 2717 "Profile %u (used by '%s') is not defined.\n", 2718 profile, domain->domainname->name); 2719 else 2720 continue; 2721 printk(KERN_ERR 2722 "Userland tools for TOMOYO 2.5 must be installed and " 2723 "policy must be initialized.\n"); 2724 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ " 2725 "for more information.\n"); 2726 panic("STOP!"); 2727 } 2728 tomoyo_read_unlock(idx); 2729 printk(KERN_INFO "Mandatory Access Control activated.\n"); 2730 } 2731 2732 /** 2733 * tomoyo_load_builtin_policy - Load built-in policy. 2734 * 2735 * Returns nothing. 2736 */ 2737 void __init tomoyo_load_builtin_policy(void) 2738 { 2739 /* 2740 * This include file is manually created and contains built-in policy 2741 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy", 2742 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager", 2743 * "tomoyo_builtin_stat" in the form of "static char [] __initdata". 2744 */ 2745 #include "builtin-policy.h" 2746 u8 i; 2747 const int idx = tomoyo_read_lock(); 2748 for (i = 0; i < 5; i++) { 2749 struct tomoyo_io_buffer head = { }; 2750 char *start = ""; 2751 switch (i) { 2752 case 0: 2753 start = tomoyo_builtin_profile; 2754 head.type = TOMOYO_PROFILE; 2755 head.write = tomoyo_write_profile; 2756 break; 2757 case 1: 2758 start = tomoyo_builtin_exception_policy; 2759 head.type = TOMOYO_EXCEPTIONPOLICY; 2760 head.write = tomoyo_write_exception; 2761 break; 2762 case 2: 2763 start = tomoyo_builtin_domain_policy; 2764 head.type = TOMOYO_DOMAINPOLICY; 2765 head.write = tomoyo_write_domain; 2766 break; 2767 case 3: 2768 start = tomoyo_builtin_manager; 2769 head.type = TOMOYO_MANAGER; 2770 head.write = tomoyo_write_manager; 2771 break; 2772 case 4: 2773 start = tomoyo_builtin_stat; 2774 head.type = TOMOYO_STAT; 2775 head.write = tomoyo_write_stat; 2776 break; 2777 } 2778 while (1) { 2779 char *end = strchr(start, '\n'); 2780 if (!end) 2781 break; 2782 *end = '\0'; 2783 tomoyo_normalize_line(start); 2784 head.write_buf = start; 2785 tomoyo_parse_policy(&head, start); 2786 start = end + 1; 2787 } 2788 } 2789 tomoyo_read_unlock(idx); 2790 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER 2791 tomoyo_check_profile(); 2792 #endif 2793 } 2794