common.c revision e0b057b406a33501a656dc8d67ea945d7bcdad61
1/* 2 * security/tomoyo/common.c 3 * 4 * Copyright (C) 2005-2011 NTT DATA CORPORATION 5 */ 6 7#include <linux/uaccess.h> 8#include <linux/slab.h> 9#include <linux/security.h> 10#include "common.h" 11 12/* String table for operation mode. */ 13const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = { 14 [TOMOYO_CONFIG_DISABLED] = "disabled", 15 [TOMOYO_CONFIG_LEARNING] = "learning", 16 [TOMOYO_CONFIG_PERMISSIVE] = "permissive", 17 [TOMOYO_CONFIG_ENFORCING] = "enforcing" 18}; 19 20/* String table for /sys/kernel/security/tomoyo/profile */ 21const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX 22 + TOMOYO_MAX_MAC_CATEGORY_INDEX] = { 23 /* CONFIG::file group */ 24 [TOMOYO_MAC_FILE_EXECUTE] = "execute", 25 [TOMOYO_MAC_FILE_OPEN] = "open", 26 [TOMOYO_MAC_FILE_CREATE] = "create", 27 [TOMOYO_MAC_FILE_UNLINK] = "unlink", 28 [TOMOYO_MAC_FILE_GETATTR] = "getattr", 29 [TOMOYO_MAC_FILE_MKDIR] = "mkdir", 30 [TOMOYO_MAC_FILE_RMDIR] = "rmdir", 31 [TOMOYO_MAC_FILE_MKFIFO] = "mkfifo", 32 [TOMOYO_MAC_FILE_MKSOCK] = "mksock", 33 [TOMOYO_MAC_FILE_TRUNCATE] = "truncate", 34 [TOMOYO_MAC_FILE_SYMLINK] = "symlink", 35 [TOMOYO_MAC_FILE_MKBLOCK] = "mkblock", 36 [TOMOYO_MAC_FILE_MKCHAR] = "mkchar", 37 [TOMOYO_MAC_FILE_LINK] = "link", 38 [TOMOYO_MAC_FILE_RENAME] = "rename", 39 [TOMOYO_MAC_FILE_CHMOD] = "chmod", 40 [TOMOYO_MAC_FILE_CHOWN] = "chown", 41 [TOMOYO_MAC_FILE_CHGRP] = "chgrp", 42 [TOMOYO_MAC_FILE_IOCTL] = "ioctl", 43 [TOMOYO_MAC_FILE_CHROOT] = "chroot", 44 [TOMOYO_MAC_FILE_MOUNT] = "mount", 45 [TOMOYO_MAC_FILE_UMOUNT] = "unmount", 46 [TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root", 47 /* CONFIG::network group */ 48 [TOMOYO_MAC_NETWORK_INET_STREAM_BIND] = "inet_stream_bind", 49 [TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN] = "inet_stream_listen", 50 [TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT] = "inet_stream_connect", 51 [TOMOYO_MAC_NETWORK_INET_DGRAM_BIND] = "inet_dgram_bind", 52 [TOMOYO_MAC_NETWORK_INET_DGRAM_SEND] = "inet_dgram_send", 53 [TOMOYO_MAC_NETWORK_INET_RAW_BIND] = "inet_raw_bind", 54 [TOMOYO_MAC_NETWORK_INET_RAW_SEND] = "inet_raw_send", 55 [TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND] = "unix_stream_bind", 56 [TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN] = "unix_stream_listen", 57 [TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT] = "unix_stream_connect", 58 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND] = "unix_dgram_bind", 59 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND] = "unix_dgram_send", 60 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND] = "unix_seqpacket_bind", 61 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN] = "unix_seqpacket_listen", 62 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = "unix_seqpacket_connect", 63 /* CONFIG::misc group */ 64 [TOMOYO_MAC_ENVIRON] = "env", 65 /* CONFIG group */ 66 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file", 67 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_NETWORK] = "network", 68 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_MISC] = "misc", 69}; 70 71/* String table for conditions. */ 72const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = { 73 [TOMOYO_TASK_UID] = "task.uid", 74 [TOMOYO_TASK_EUID] = "task.euid", 75 [TOMOYO_TASK_SUID] = "task.suid", 76 [TOMOYO_TASK_FSUID] = "task.fsuid", 77 [TOMOYO_TASK_GID] = "task.gid", 78 [TOMOYO_TASK_EGID] = "task.egid", 79 [TOMOYO_TASK_SGID] = "task.sgid", 80 [TOMOYO_TASK_FSGID] = "task.fsgid", 81 [TOMOYO_TASK_PID] = "task.pid", 82 [TOMOYO_TASK_PPID] = "task.ppid", 83 [TOMOYO_EXEC_ARGC] = "exec.argc", 84 [TOMOYO_EXEC_ENVC] = "exec.envc", 85 [TOMOYO_TYPE_IS_SOCKET] = "socket", 86 [TOMOYO_TYPE_IS_SYMLINK] = "symlink", 87 [TOMOYO_TYPE_IS_FILE] = "file", 88 [TOMOYO_TYPE_IS_BLOCK_DEV] = "block", 89 [TOMOYO_TYPE_IS_DIRECTORY] = "directory", 90 [TOMOYO_TYPE_IS_CHAR_DEV] = "char", 91 [TOMOYO_TYPE_IS_FIFO] = "fifo", 92 [TOMOYO_MODE_SETUID] = "setuid", 93 [TOMOYO_MODE_SETGID] = "setgid", 94 [TOMOYO_MODE_STICKY] = "sticky", 95 [TOMOYO_MODE_OWNER_READ] = "owner_read", 96 [TOMOYO_MODE_OWNER_WRITE] = "owner_write", 97 [TOMOYO_MODE_OWNER_EXECUTE] = "owner_execute", 98 [TOMOYO_MODE_GROUP_READ] = "group_read", 99 [TOMOYO_MODE_GROUP_WRITE] = "group_write", 100 [TOMOYO_MODE_GROUP_EXECUTE] = "group_execute", 101 [TOMOYO_MODE_OTHERS_READ] = "others_read", 102 [TOMOYO_MODE_OTHERS_WRITE] = "others_write", 103 [TOMOYO_MODE_OTHERS_EXECUTE] = "others_execute", 104 [TOMOYO_EXEC_REALPATH] = "exec.realpath", 105 [TOMOYO_SYMLINK_TARGET] = "symlink.target", 106 [TOMOYO_PATH1_UID] = "path1.uid", 107 [TOMOYO_PATH1_GID] = "path1.gid", 108 [TOMOYO_PATH1_INO] = "path1.ino", 109 [TOMOYO_PATH1_MAJOR] = "path1.major", 110 [TOMOYO_PATH1_MINOR] = "path1.minor", 111 [TOMOYO_PATH1_PERM] = "path1.perm", 112 [TOMOYO_PATH1_TYPE] = "path1.type", 113 [TOMOYO_PATH1_DEV_MAJOR] = "path1.dev_major", 114 [TOMOYO_PATH1_DEV_MINOR] = "path1.dev_minor", 115 [TOMOYO_PATH2_UID] = "path2.uid", 116 [TOMOYO_PATH2_GID] = "path2.gid", 117 [TOMOYO_PATH2_INO] = "path2.ino", 118 [TOMOYO_PATH2_MAJOR] = "path2.major", 119 [TOMOYO_PATH2_MINOR] = "path2.minor", 120 [TOMOYO_PATH2_PERM] = "path2.perm", 121 [TOMOYO_PATH2_TYPE] = "path2.type", 122 [TOMOYO_PATH2_DEV_MAJOR] = "path2.dev_major", 123 [TOMOYO_PATH2_DEV_MINOR] = "path2.dev_minor", 124 [TOMOYO_PATH1_PARENT_UID] = "path1.parent.uid", 125 [TOMOYO_PATH1_PARENT_GID] = "path1.parent.gid", 126 [TOMOYO_PATH1_PARENT_INO] = "path1.parent.ino", 127 [TOMOYO_PATH1_PARENT_PERM] = "path1.parent.perm", 128 [TOMOYO_PATH2_PARENT_UID] = "path2.parent.uid", 129 [TOMOYO_PATH2_PARENT_GID] = "path2.parent.gid", 130 [TOMOYO_PATH2_PARENT_INO] = "path2.parent.ino", 131 [TOMOYO_PATH2_PARENT_PERM] = "path2.parent.perm", 132}; 133 134/* String table for PREFERENCE keyword. */ 135static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = { 136 [TOMOYO_PREF_MAX_AUDIT_LOG] = "max_audit_log", 137 [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry", 138}; 139 140/* String table for path operation. */ 141const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = { 142 [TOMOYO_TYPE_EXECUTE] = "execute", 143 [TOMOYO_TYPE_READ] = "read", 144 [TOMOYO_TYPE_WRITE] = "write", 145 [TOMOYO_TYPE_APPEND] = "append", 146 [TOMOYO_TYPE_UNLINK] = "unlink", 147 [TOMOYO_TYPE_GETATTR] = "getattr", 148 [TOMOYO_TYPE_RMDIR] = "rmdir", 149 [TOMOYO_TYPE_TRUNCATE] = "truncate", 150 [TOMOYO_TYPE_SYMLINK] = "symlink", 151 [TOMOYO_TYPE_CHROOT] = "chroot", 152 [TOMOYO_TYPE_UMOUNT] = "unmount", 153}; 154 155/* String table for socket's operation. */ 156const char * const tomoyo_socket_keyword[TOMOYO_MAX_NETWORK_OPERATION] = { 157 [TOMOYO_NETWORK_BIND] = "bind", 158 [TOMOYO_NETWORK_LISTEN] = "listen", 159 [TOMOYO_NETWORK_CONNECT] = "connect", 160 [TOMOYO_NETWORK_SEND] = "send", 161}; 162 163/* String table for categories. */ 164static const char * const tomoyo_category_keywords 165[TOMOYO_MAX_MAC_CATEGORY_INDEX] = { 166 [TOMOYO_MAC_CATEGORY_FILE] = "file", 167 [TOMOYO_MAC_CATEGORY_NETWORK] = "network", 168 [TOMOYO_MAC_CATEGORY_MISC] = "misc", 169}; 170 171/* Permit policy management by non-root user? */ 172static bool tomoyo_manage_by_non_root; 173 174/* Utility functions. */ 175 176/** 177 * tomoyo_yesno - Return "yes" or "no". 178 * 179 * @value: Bool value. 180 */ 181const char *tomoyo_yesno(const unsigned int value) 182{ 183 return value ? "yes" : "no"; 184} 185 186/** 187 * tomoyo_addprintf - strncat()-like-snprintf(). 188 * 189 * @buffer: Buffer to write to. Must be '\0'-terminated. 190 * @len: Size of @buffer. 191 * @fmt: The printf()'s format string, followed by parameters. 192 * 193 * Returns nothing. 194 */ 195static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...) 196{ 197 va_list args; 198 const int pos = strlen(buffer); 199 va_start(args, fmt); 200 vsnprintf(buffer + pos, len - pos - 1, fmt, args); 201 va_end(args); 202} 203 204/** 205 * tomoyo_flush - Flush queued string to userspace's buffer. 206 * 207 * @head: Pointer to "struct tomoyo_io_buffer". 208 * 209 * Returns true if all data was flushed, false otherwise. 210 */ 211static bool tomoyo_flush(struct tomoyo_io_buffer *head) 212{ 213 while (head->r.w_pos) { 214 const char *w = head->r.w[0]; 215 size_t len = strlen(w); 216 if (len) { 217 if (len > head->read_user_buf_avail) 218 len = head->read_user_buf_avail; 219 if (!len) 220 return false; 221 if (copy_to_user(head->read_user_buf, w, len)) 222 return false; 223 head->read_user_buf_avail -= len; 224 head->read_user_buf += len; 225 w += len; 226 } 227 head->r.w[0] = w; 228 if (*w) 229 return false; 230 /* Add '\0' for audit logs and query. */ 231 if (head->poll) { 232 if (!head->read_user_buf_avail || 233 copy_to_user(head->read_user_buf, "", 1)) 234 return false; 235 head->read_user_buf_avail--; 236 head->read_user_buf++; 237 } 238 head->r.w_pos--; 239 for (len = 0; len < head->r.w_pos; len++) 240 head->r.w[len] = head->r.w[len + 1]; 241 } 242 head->r.avail = 0; 243 return true; 244} 245 246/** 247 * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure. 248 * 249 * @head: Pointer to "struct tomoyo_io_buffer". 250 * @string: String to print. 251 * 252 * Note that @string has to be kept valid until @head is kfree()d. 253 * This means that char[] allocated on stack memory cannot be passed to 254 * this function. Use tomoyo_io_printf() for char[] allocated on stack memory. 255 */ 256static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string) 257{ 258 if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) { 259 head->r.w[head->r.w_pos++] = string; 260 tomoyo_flush(head); 261 } else 262 WARN_ON(1); 263} 264 265static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, 266 ...) __printf(2, 3); 267 268/** 269 * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure. 270 * 271 * @head: Pointer to "struct tomoyo_io_buffer". 272 * @fmt: The printf()'s format string, followed by parameters. 273 */ 274static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, 275 ...) 276{ 277 va_list args; 278 size_t len; 279 size_t pos = head->r.avail; 280 int size = head->readbuf_size - pos; 281 if (size <= 0) 282 return; 283 va_start(args, fmt); 284 len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1; 285 va_end(args); 286 if (pos + len >= head->readbuf_size) { 287 WARN_ON(1); 288 return; 289 } 290 head->r.avail += len; 291 tomoyo_set_string(head, head->read_buf + pos); 292} 293 294/** 295 * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure. 296 * 297 * @head: Pointer to "struct tomoyo_io_buffer". 298 * 299 * Returns nothing. 300 */ 301static void tomoyo_set_space(struct tomoyo_io_buffer *head) 302{ 303 tomoyo_set_string(head, " "); 304} 305 306/** 307 * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure. 308 * 309 * @head: Pointer to "struct tomoyo_io_buffer". 310 * 311 * Returns nothing. 312 */ 313static bool tomoyo_set_lf(struct tomoyo_io_buffer *head) 314{ 315 tomoyo_set_string(head, "\n"); 316 return !head->r.w_pos; 317} 318 319/** 320 * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure. 321 * 322 * @head: Pointer to "struct tomoyo_io_buffer". 323 * 324 * Returns nothing. 325 */ 326static void tomoyo_set_slash(struct tomoyo_io_buffer *head) 327{ 328 tomoyo_set_string(head, "/"); 329} 330 331/* List of namespaces. */ 332LIST_HEAD(tomoyo_namespace_list); 333/* True if namespace other than tomoyo_kernel_namespace is defined. */ 334static bool tomoyo_namespace_enabled; 335 336/** 337 * tomoyo_init_policy_namespace - Initialize namespace. 338 * 339 * @ns: Pointer to "struct tomoyo_policy_namespace". 340 * 341 * Returns nothing. 342 */ 343void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns) 344{ 345 unsigned int idx; 346 for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++) 347 INIT_LIST_HEAD(&ns->acl_group[idx]); 348 for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++) 349 INIT_LIST_HEAD(&ns->group_list[idx]); 350 for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++) 351 INIT_LIST_HEAD(&ns->policy_list[idx]); 352 ns->profile_version = 20110903; 353 tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list); 354 list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list); 355} 356 357/** 358 * tomoyo_print_namespace - Print namespace header. 359 * 360 * @head: Pointer to "struct tomoyo_io_buffer". 361 * 362 * Returns nothing. 363 */ 364static void tomoyo_print_namespace(struct tomoyo_io_buffer *head) 365{ 366 if (!tomoyo_namespace_enabled) 367 return; 368 tomoyo_set_string(head, 369 container_of(head->r.ns, 370 struct tomoyo_policy_namespace, 371 namespace_list)->name); 372 tomoyo_set_space(head); 373} 374 375/** 376 * tomoyo_print_name_union - Print a tomoyo_name_union. 377 * 378 * @head: Pointer to "struct tomoyo_io_buffer". 379 * @ptr: Pointer to "struct tomoyo_name_union". 380 */ 381static void tomoyo_print_name_union(struct tomoyo_io_buffer *head, 382 const struct tomoyo_name_union *ptr) 383{ 384 tomoyo_set_space(head); 385 if (ptr->group) { 386 tomoyo_set_string(head, "@"); 387 tomoyo_set_string(head, ptr->group->group_name->name); 388 } else { 389 tomoyo_set_string(head, ptr->filename->name); 390 } 391} 392 393/** 394 * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote. 395 * 396 * @head: Pointer to "struct tomoyo_io_buffer". 397 * @ptr: Pointer to "struct tomoyo_name_union". 398 * 399 * Returns nothing. 400 */ 401static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head, 402 const struct tomoyo_name_union *ptr) 403{ 404 if (ptr->group) { 405 tomoyo_set_string(head, "@"); 406 tomoyo_set_string(head, ptr->group->group_name->name); 407 } else { 408 tomoyo_set_string(head, "\""); 409 tomoyo_set_string(head, ptr->filename->name); 410 tomoyo_set_string(head, "\""); 411 } 412} 413 414/** 415 * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space. 416 * 417 * @head: Pointer to "struct tomoyo_io_buffer". 418 * @ptr: Pointer to "struct tomoyo_number_union". 419 * 420 * Returns nothing. 421 */ 422static void tomoyo_print_number_union_nospace 423(struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr) 424{ 425 if (ptr->group) { 426 tomoyo_set_string(head, "@"); 427 tomoyo_set_string(head, ptr->group->group_name->name); 428 } else { 429 int i; 430 unsigned long min = ptr->values[0]; 431 const unsigned long max = ptr->values[1]; 432 u8 min_type = ptr->value_type[0]; 433 const u8 max_type = ptr->value_type[1]; 434 char buffer[128]; 435 buffer[0] = '\0'; 436 for (i = 0; i < 2; i++) { 437 switch (min_type) { 438 case TOMOYO_VALUE_TYPE_HEXADECIMAL: 439 tomoyo_addprintf(buffer, sizeof(buffer), 440 "0x%lX", min); 441 break; 442 case TOMOYO_VALUE_TYPE_OCTAL: 443 tomoyo_addprintf(buffer, sizeof(buffer), 444 "0%lo", min); 445 break; 446 default: 447 tomoyo_addprintf(buffer, sizeof(buffer), "%lu", 448 min); 449 break; 450 } 451 if (min == max && min_type == max_type) 452 break; 453 tomoyo_addprintf(buffer, sizeof(buffer), "-"); 454 min_type = max_type; 455 min = max; 456 } 457 tomoyo_io_printf(head, "%s", buffer); 458 } 459} 460 461/** 462 * tomoyo_print_number_union - Print a tomoyo_number_union. 463 * 464 * @head: Pointer to "struct tomoyo_io_buffer". 465 * @ptr: Pointer to "struct tomoyo_number_union". 466 * 467 * Returns nothing. 468 */ 469static void tomoyo_print_number_union(struct tomoyo_io_buffer *head, 470 const struct tomoyo_number_union *ptr) 471{ 472 tomoyo_set_space(head); 473 tomoyo_print_number_union_nospace(head, ptr); 474} 475 476/** 477 * tomoyo_assign_profile - Create a new profile. 478 * 479 * @ns: Pointer to "struct tomoyo_policy_namespace". 480 * @profile: Profile number to create. 481 * 482 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise. 483 */ 484static struct tomoyo_profile *tomoyo_assign_profile 485(struct tomoyo_policy_namespace *ns, const unsigned int profile) 486{ 487 struct tomoyo_profile *ptr; 488 struct tomoyo_profile *entry; 489 if (profile >= TOMOYO_MAX_PROFILES) 490 return NULL; 491 ptr = ns->profile_ptr[profile]; 492 if (ptr) 493 return ptr; 494 entry = kzalloc(sizeof(*entry), GFP_NOFS); 495 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 496 goto out; 497 ptr = ns->profile_ptr[profile]; 498 if (!ptr && tomoyo_memory_ok(entry)) { 499 ptr = entry; 500 ptr->default_config = TOMOYO_CONFIG_DISABLED | 501 TOMOYO_CONFIG_WANT_GRANT_LOG | 502 TOMOYO_CONFIG_WANT_REJECT_LOG; 503 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT, 504 sizeof(ptr->config)); 505 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] = 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 */ 527struct 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 */ 545static 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 */ 567static 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 */ 584static 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 */ 660static 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 */ 713static 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 */ 728static 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 return; 753 head->r.step++; 754 break; 755 case 2: 756 { 757 u8 i; 758 const struct tomoyo_path_info *comment = 759 profile->comment; 760 tomoyo_print_namespace(head); 761 tomoyo_io_printf(head, "%u-COMMENT=", index); 762 tomoyo_set_string(head, comment ? comment->name : ""); 763 tomoyo_set_lf(head); 764 tomoyo_io_printf(head, "%u-PREFERENCE={ ", index); 765 for (i = 0; i < TOMOYO_MAX_PREF; i++) 766 tomoyo_io_printf(head, "%s=%u ", 767 tomoyo_pref_keywords[i], 768 profile->pref[i]); 769 tomoyo_set_string(head, "}\n"); 770 head->r.step++; 771 } 772 break; 773 case 3: 774 { 775 tomoyo_print_namespace(head); 776 tomoyo_io_printf(head, "%u-%s", index, "CONFIG"); 777 tomoyo_print_config(head, profile->default_config); 778 head->r.bit = 0; 779 head->r.step++; 780 } 781 break; 782 case 4: 783 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX 784 + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) { 785 const u8 i = head->r.bit; 786 const u8 config = profile->config[i]; 787 if (config == TOMOYO_CONFIG_USE_DEFAULT) 788 continue; 789 tomoyo_print_namespace(head); 790 if (i < TOMOYO_MAX_MAC_INDEX) 791 tomoyo_io_printf(head, "%u-CONFIG::%s::%s", 792 index, 793 tomoyo_category_keywords 794 [tomoyo_index2category[i]], 795 tomoyo_mac_keywords[i]); 796 else 797 tomoyo_io_printf(head, "%u-CONFIG::%s", index, 798 tomoyo_mac_keywords[i]); 799 tomoyo_print_config(head, config); 800 head->r.bit++; 801 break; 802 } 803 if (head->r.bit == TOMOYO_MAX_MAC_INDEX 804 + TOMOYO_MAX_MAC_CATEGORY_INDEX) { 805 head->r.index++; 806 head->r.step = 1; 807 } 808 break; 809 } 810 if (tomoyo_flush(head)) 811 goto next; 812} 813 814/** 815 * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry. 816 * 817 * @a: Pointer to "struct tomoyo_acl_head". 818 * @b: Pointer to "struct tomoyo_acl_head". 819 * 820 * Returns true if @a == @b, false otherwise. 821 */ 822static bool tomoyo_same_manager(const struct tomoyo_acl_head *a, 823 const struct tomoyo_acl_head *b) 824{ 825 return container_of(a, struct tomoyo_manager, head)->manager == 826 container_of(b, struct tomoyo_manager, head)->manager; 827} 828 829/** 830 * tomoyo_update_manager_entry - Add a manager entry. 831 * 832 * @manager: The path to manager or the domainnamme. 833 * @is_delete: True if it is a delete request. 834 * 835 * Returns 0 on success, negative value otherwise. 836 * 837 * Caller holds tomoyo_read_lock(). 838 */ 839static int tomoyo_update_manager_entry(const char *manager, 840 const bool is_delete) 841{ 842 struct tomoyo_manager e = { }; 843 struct tomoyo_acl_param param = { 844 /* .ns = &tomoyo_kernel_namespace, */ 845 .is_delete = is_delete, 846 .list = &tomoyo_kernel_namespace. 847 policy_list[TOMOYO_ID_MANAGER], 848 }; 849 int error = is_delete ? -ENOENT : -ENOMEM; 850 if (tomoyo_domain_def(manager)) { 851 if (!tomoyo_correct_domain(manager)) 852 return -EINVAL; 853 e.is_domain = true; 854 } else { 855 if (!tomoyo_correct_path(manager)) 856 return -EINVAL; 857 } 858 e.manager = tomoyo_get_name(manager); 859 if (e.manager) { 860 error = tomoyo_update_policy(&e.head, sizeof(e), ¶m, 861 tomoyo_same_manager); 862 tomoyo_put_name(e.manager); 863 } 864 return error; 865} 866 867/** 868 * tomoyo_write_manager - Write manager policy. 869 * 870 * @head: Pointer to "struct tomoyo_io_buffer". 871 * 872 * Returns 0 on success, negative value otherwise. 873 * 874 * Caller holds tomoyo_read_lock(). 875 */ 876static int tomoyo_write_manager(struct tomoyo_io_buffer *head) 877{ 878 char *data = head->write_buf; 879 880 if (!strcmp(data, "manage_by_non_root")) { 881 tomoyo_manage_by_non_root = !head->w.is_delete; 882 return 0; 883 } 884 return tomoyo_update_manager_entry(data, head->w.is_delete); 885} 886 887/** 888 * tomoyo_read_manager - Read manager policy. 889 * 890 * @head: Pointer to "struct tomoyo_io_buffer". 891 * 892 * Caller holds tomoyo_read_lock(). 893 */ 894static void tomoyo_read_manager(struct tomoyo_io_buffer *head) 895{ 896 if (head->r.eof) 897 return; 898 list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace. 899 policy_list[TOMOYO_ID_MANAGER]) { 900 struct tomoyo_manager *ptr = 901 list_entry(head->r.acl, typeof(*ptr), head.list); 902 if (ptr->head.is_deleted) 903 continue; 904 if (!tomoyo_flush(head)) 905 return; 906 tomoyo_set_string(head, ptr->manager->name); 907 tomoyo_set_lf(head); 908 } 909 head->r.eof = true; 910} 911 912/** 913 * tomoyo_manager - Check whether the current process is a policy manager. 914 * 915 * Returns true if the current process is permitted to modify policy 916 * via /sys/kernel/security/tomoyo/ interface. 917 * 918 * Caller holds tomoyo_read_lock(). 919 */ 920static bool tomoyo_manager(void) 921{ 922 struct tomoyo_manager *ptr; 923 const char *exe; 924 const struct task_struct *task = current; 925 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname; 926 bool found = false; 927 928 if (!tomoyo_policy_loaded) 929 return true; 930 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid)) 931 return false; 932 list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace. 933 policy_list[TOMOYO_ID_MANAGER], head.list) { 934 if (!ptr->head.is_deleted && ptr->is_domain 935 && !tomoyo_pathcmp(domainname, ptr->manager)) { 936 found = true; 937 break; 938 } 939 } 940 if (found) 941 return true; 942 exe = tomoyo_get_exe(); 943 if (!exe) 944 return false; 945 list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace. 946 policy_list[TOMOYO_ID_MANAGER], head.list) { 947 if (!ptr->head.is_deleted && !ptr->is_domain 948 && !strcmp(exe, ptr->manager->name)) { 949 found = true; 950 break; 951 } 952 } 953 if (!found) { /* Reduce error messages. */ 954 static pid_t last_pid; 955 const pid_t pid = current->pid; 956 if (last_pid != pid) { 957 printk(KERN_WARNING "%s ( %s ) is not permitted to " 958 "update policies.\n", domainname->name, exe); 959 last_pid = pid; 960 } 961 } 962 kfree(exe); 963 return found; 964} 965 966/** 967 * tomoyo_select_domain - Parse select command. 968 * 969 * @head: Pointer to "struct tomoyo_io_buffer". 970 * @data: String to parse. 971 * 972 * Returns true on success, false otherwise. 973 * 974 * Caller holds tomoyo_read_lock(). 975 */ 976static bool tomoyo_select_domain(struct tomoyo_io_buffer *head, 977 const char *data) 978{ 979 unsigned int pid; 980 struct tomoyo_domain_info *domain = NULL; 981 bool global_pid = false; 982 if (strncmp(data, "select ", 7)) 983 return false; 984 data += 7; 985 if (sscanf(data, "pid=%u", &pid) == 1 || 986 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { 987 struct task_struct *p; 988 rcu_read_lock(); 989 if (global_pid) 990 p = find_task_by_pid_ns(pid, &init_pid_ns); 991 else 992 p = find_task_by_vpid(pid); 993 if (p) 994 domain = tomoyo_real_domain(p); 995 rcu_read_unlock(); 996 } else if (!strncmp(data, "domain=", 7)) { 997 if (tomoyo_domain_def(data + 7)) 998 domain = tomoyo_find_domain(data + 7); 999 } else 1000 return false; 1001 head->w.domain = domain; 1002 /* Accessing read_buf is safe because head->io_sem is held. */ 1003 if (!head->read_buf) 1004 return true; /* Do nothing if open(O_WRONLY). */ 1005 memset(&head->r, 0, sizeof(head->r)); 1006 head->r.print_this_domain_only = true; 1007 if (domain) 1008 head->r.domain = &domain->list; 1009 else 1010 head->r.eof = 1; 1011 tomoyo_io_printf(head, "# select %s\n", data); 1012 if (domain && domain->is_deleted) 1013 tomoyo_io_printf(head, "# This is a deleted domain.\n"); 1014 return true; 1015} 1016 1017/** 1018 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry. 1019 * 1020 * @a: Pointer to "struct tomoyo_acl_info". 1021 * @b: Pointer to "struct tomoyo_acl_info". 1022 * 1023 * Returns true if @a == @b, false otherwise. 1024 */ 1025static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a, 1026 const struct tomoyo_acl_info *b) 1027{ 1028 const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head); 1029 const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head); 1030 return p1->domainname == p2->domainname; 1031} 1032 1033/** 1034 * tomoyo_write_task - Update task related list. 1035 * 1036 * @param: Pointer to "struct tomoyo_acl_param". 1037 * 1038 * Returns 0 on success, negative value otherwise. 1039 * 1040 * Caller holds tomoyo_read_lock(). 1041 */ 1042static int tomoyo_write_task(struct tomoyo_acl_param *param) 1043{ 1044 int error = -EINVAL; 1045 if (tomoyo_str_starts(¶m->data, "manual_domain_transition ")) { 1046 struct tomoyo_task_acl e = { 1047 .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL, 1048 .domainname = tomoyo_get_domainname(param), 1049 }; 1050 if (e.domainname) 1051 error = tomoyo_update_domain(&e.head, sizeof(e), param, 1052 tomoyo_same_task_acl, 1053 NULL); 1054 tomoyo_put_name(e.domainname); 1055 } 1056 return error; 1057} 1058 1059/** 1060 * tomoyo_delete_domain - Delete a domain. 1061 * 1062 * @domainname: The name of domain. 1063 * 1064 * Returns 0. 1065 * 1066 * Caller holds tomoyo_read_lock(). 1067 */ 1068static int tomoyo_delete_domain(char *domainname) 1069{ 1070 struct tomoyo_domain_info *domain; 1071 struct tomoyo_path_info name; 1072 1073 name.name = domainname; 1074 tomoyo_fill_path_info(&name); 1075 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 1076 return 0; 1077 /* Is there an active domain? */ 1078 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 1079 /* Never delete tomoyo_kernel_domain */ 1080 if (domain == &tomoyo_kernel_domain) 1081 continue; 1082 if (domain->is_deleted || 1083 tomoyo_pathcmp(domain->domainname, &name)) 1084 continue; 1085 domain->is_deleted = true; 1086 break; 1087 } 1088 mutex_unlock(&tomoyo_policy_lock); 1089 return 0; 1090} 1091 1092/** 1093 * tomoyo_write_domain2 - Write domain policy. 1094 * 1095 * @ns: Pointer to "struct tomoyo_policy_namespace". 1096 * @list: Pointer to "struct list_head". 1097 * @data: Policy to be interpreted. 1098 * @is_delete: True if it is a delete request. 1099 * 1100 * Returns 0 on success, negative value otherwise. 1101 * 1102 * Caller holds tomoyo_read_lock(). 1103 */ 1104static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns, 1105 struct list_head *list, char *data, 1106 const bool is_delete) 1107{ 1108 struct tomoyo_acl_param param = { 1109 .ns = ns, 1110 .list = list, 1111 .data = data, 1112 .is_delete = is_delete, 1113 }; 1114 static const struct { 1115 const char *keyword; 1116 int (*write) (struct tomoyo_acl_param *); 1117 } tomoyo_callback[5] = { 1118 { "file ", tomoyo_write_file }, 1119 { "network inet ", tomoyo_write_inet_network }, 1120 { "network unix ", tomoyo_write_unix_network }, 1121 { "misc ", tomoyo_write_misc }, 1122 { "task ", tomoyo_write_task }, 1123 }; 1124 u8 i; 1125 1126 for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) { 1127 if (!tomoyo_str_starts(¶m.data, 1128 tomoyo_callback[i].keyword)) 1129 continue; 1130 return tomoyo_callback[i].write(¶m); 1131 } 1132 return -EINVAL; 1133} 1134 1135/* String table for domain flags. */ 1136const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = { 1137 [TOMOYO_DIF_QUOTA_WARNED] = "quota_exceeded\n", 1138 [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n", 1139}; 1140 1141/** 1142 * tomoyo_write_domain - Write domain policy. 1143 * 1144 * @head: Pointer to "struct tomoyo_io_buffer". 1145 * 1146 * Returns 0 on success, negative value otherwise. 1147 * 1148 * Caller holds tomoyo_read_lock(). 1149 */ 1150static int tomoyo_write_domain(struct tomoyo_io_buffer *head) 1151{ 1152 char *data = head->write_buf; 1153 struct tomoyo_policy_namespace *ns; 1154 struct tomoyo_domain_info *domain = head->w.domain; 1155 const bool is_delete = head->w.is_delete; 1156 bool is_select = !is_delete && tomoyo_str_starts(&data, "select "); 1157 unsigned int profile; 1158 if (*data == '<') { 1159 domain = NULL; 1160 if (is_delete) 1161 tomoyo_delete_domain(data); 1162 else if (is_select) 1163 domain = tomoyo_find_domain(data); 1164 else 1165 domain = tomoyo_assign_domain(data, false); 1166 head->w.domain = domain; 1167 return 0; 1168 } 1169 if (!domain) 1170 return -EINVAL; 1171 ns = domain->ns; 1172 if (sscanf(data, "use_profile %u", &profile) == 1 1173 && profile < TOMOYO_MAX_PROFILES) { 1174 if (!tomoyo_policy_loaded || ns->profile_ptr[profile]) 1175 domain->profile = (u8) profile; 1176 return 0; 1177 } 1178 if (sscanf(data, "use_group %u\n", &profile) == 1 1179 && profile < TOMOYO_MAX_ACL_GROUPS) { 1180 if (!is_delete) 1181 domain->group = (u8) profile; 1182 return 0; 1183 } 1184 for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) { 1185 const char *cp = tomoyo_dif[profile]; 1186 if (strncmp(data, cp, strlen(cp) - 1)) 1187 continue; 1188 domain->flags[profile] = !is_delete; 1189 return 0; 1190 } 1191 return tomoyo_write_domain2(ns, &domain->acl_info_list, data, 1192 is_delete); 1193} 1194 1195/** 1196 * tomoyo_print_condition - Print condition part. 1197 * 1198 * @head: Pointer to "struct tomoyo_io_buffer". 1199 * @cond: Pointer to "struct tomoyo_condition". 1200 * 1201 * Returns true on success, false otherwise. 1202 */ 1203static bool tomoyo_print_condition(struct tomoyo_io_buffer *head, 1204 const struct tomoyo_condition *cond) 1205{ 1206 switch (head->r.cond_step) { 1207 case 0: 1208 head->r.cond_index = 0; 1209 head->r.cond_step++; 1210 if (cond->transit) { 1211 tomoyo_set_space(head); 1212 tomoyo_set_string(head, cond->transit->name); 1213 } 1214 /* fall through */ 1215 case 1: 1216 { 1217 const u16 condc = cond->condc; 1218 const struct tomoyo_condition_element *condp = 1219 (typeof(condp)) (cond + 1); 1220 const struct tomoyo_number_union *numbers_p = 1221 (typeof(numbers_p)) (condp + condc); 1222 const struct tomoyo_name_union *names_p = 1223 (typeof(names_p)) 1224 (numbers_p + cond->numbers_count); 1225 const struct tomoyo_argv *argv = 1226 (typeof(argv)) (names_p + cond->names_count); 1227 const struct tomoyo_envp *envp = 1228 (typeof(envp)) (argv + cond->argc); 1229 u16 skip; 1230 for (skip = 0; skip < head->r.cond_index; skip++) { 1231 const u8 left = condp->left; 1232 const u8 right = condp->right; 1233 condp++; 1234 switch (left) { 1235 case TOMOYO_ARGV_ENTRY: 1236 argv++; 1237 continue; 1238 case TOMOYO_ENVP_ENTRY: 1239 envp++; 1240 continue; 1241 case TOMOYO_NUMBER_UNION: 1242 numbers_p++; 1243 break; 1244 } 1245 switch (right) { 1246 case TOMOYO_NAME_UNION: 1247 names_p++; 1248 break; 1249 case TOMOYO_NUMBER_UNION: 1250 numbers_p++; 1251 break; 1252 } 1253 } 1254 while (head->r.cond_index < condc) { 1255 const u8 match = condp->equals; 1256 const u8 left = condp->left; 1257 const u8 right = condp->right; 1258 if (!tomoyo_flush(head)) 1259 return false; 1260 condp++; 1261 head->r.cond_index++; 1262 tomoyo_set_space(head); 1263 switch (left) { 1264 case TOMOYO_ARGV_ENTRY: 1265 tomoyo_io_printf(head, 1266 "exec.argv[%lu]%s=\"", 1267 argv->index, argv-> 1268 is_not ? "!" : ""); 1269 tomoyo_set_string(head, 1270 argv->value->name); 1271 tomoyo_set_string(head, "\""); 1272 argv++; 1273 continue; 1274 case TOMOYO_ENVP_ENTRY: 1275 tomoyo_set_string(head, 1276 "exec.envp[\""); 1277 tomoyo_set_string(head, 1278 envp->name->name); 1279 tomoyo_io_printf(head, "\"]%s=", envp-> 1280 is_not ? "!" : ""); 1281 if (envp->value) { 1282 tomoyo_set_string(head, "\""); 1283 tomoyo_set_string(head, envp-> 1284 value->name); 1285 tomoyo_set_string(head, "\""); 1286 } else { 1287 tomoyo_set_string(head, 1288 "NULL"); 1289 } 1290 envp++; 1291 continue; 1292 case TOMOYO_NUMBER_UNION: 1293 tomoyo_print_number_union_nospace 1294 (head, numbers_p++); 1295 break; 1296 default: 1297 tomoyo_set_string(head, 1298 tomoyo_condition_keyword[left]); 1299 break; 1300 } 1301 tomoyo_set_string(head, match ? "=" : "!="); 1302 switch (right) { 1303 case TOMOYO_NAME_UNION: 1304 tomoyo_print_name_union_quoted 1305 (head, names_p++); 1306 break; 1307 case TOMOYO_NUMBER_UNION: 1308 tomoyo_print_number_union_nospace 1309 (head, numbers_p++); 1310 break; 1311 default: 1312 tomoyo_set_string(head, 1313 tomoyo_condition_keyword[right]); 1314 break; 1315 } 1316 } 1317 } 1318 head->r.cond_step++; 1319 /* fall through */ 1320 case 2: 1321 if (!tomoyo_flush(head)) 1322 break; 1323 head->r.cond_step++; 1324 /* fall through */ 1325 case 3: 1326 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO) 1327 tomoyo_io_printf(head, " grant_log=%s", 1328 tomoyo_yesno(cond->grant_log == 1329 TOMOYO_GRANTLOG_YES)); 1330 tomoyo_set_lf(head); 1331 return true; 1332 } 1333 return false; 1334} 1335 1336/** 1337 * tomoyo_set_group - Print "acl_group " header keyword and category name. 1338 * 1339 * @head: Pointer to "struct tomoyo_io_buffer". 1340 * @category: Category name. 1341 * 1342 * Returns nothing. 1343 */ 1344static void tomoyo_set_group(struct tomoyo_io_buffer *head, 1345 const char *category) 1346{ 1347 if (head->type == TOMOYO_EXCEPTIONPOLICY) { 1348 tomoyo_print_namespace(head); 1349 tomoyo_io_printf(head, "acl_group %u ", 1350 head->r.acl_group_index); 1351 } 1352 tomoyo_set_string(head, category); 1353} 1354 1355/** 1356 * tomoyo_print_entry - Print an ACL entry. 1357 * 1358 * @head: Pointer to "struct tomoyo_io_buffer". 1359 * @acl: Pointer to an ACL entry. 1360 * 1361 * Returns true on success, false otherwise. 1362 */ 1363static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, 1364 struct tomoyo_acl_info *acl) 1365{ 1366 const u8 acl_type = acl->type; 1367 bool first = true; 1368 u8 bit; 1369 1370 if (head->r.print_cond_part) 1371 goto print_cond_part; 1372 if (acl->is_deleted) 1373 return true; 1374 if (!tomoyo_flush(head)) 1375 return false; 1376 else if (acl_type == TOMOYO_TYPE_PATH_ACL) { 1377 struct tomoyo_path_acl *ptr = 1378 container_of(acl, typeof(*ptr), head); 1379 const u16 perm = ptr->perm; 1380 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { 1381 if (!(perm & (1 << bit))) 1382 continue; 1383 if (head->r.print_transition_related_only && 1384 bit != TOMOYO_TYPE_EXECUTE) 1385 continue; 1386 if (first) { 1387 tomoyo_set_group(head, "file "); 1388 first = false; 1389 } else { 1390 tomoyo_set_slash(head); 1391 } 1392 tomoyo_set_string(head, tomoyo_path_keyword[bit]); 1393 } 1394 if (first) 1395 return true; 1396 tomoyo_print_name_union(head, &ptr->name); 1397 } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) { 1398 struct tomoyo_task_acl *ptr = 1399 container_of(acl, typeof(*ptr), head); 1400 tomoyo_set_group(head, "task "); 1401 tomoyo_set_string(head, "manual_domain_transition "); 1402 tomoyo_set_string(head, ptr->domainname->name); 1403 } else if (head->r.print_transition_related_only) { 1404 return true; 1405 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) { 1406 struct tomoyo_path2_acl *ptr = 1407 container_of(acl, typeof(*ptr), head); 1408 const u8 perm = ptr->perm; 1409 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) { 1410 if (!(perm & (1 << bit))) 1411 continue; 1412 if (first) { 1413 tomoyo_set_group(head, "file "); 1414 first = false; 1415 } else { 1416 tomoyo_set_slash(head); 1417 } 1418 tomoyo_set_string(head, tomoyo_mac_keywords 1419 [tomoyo_pp2mac[bit]]); 1420 } 1421 if (first) 1422 return true; 1423 tomoyo_print_name_union(head, &ptr->name1); 1424 tomoyo_print_name_union(head, &ptr->name2); 1425 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) { 1426 struct tomoyo_path_number_acl *ptr = 1427 container_of(acl, typeof(*ptr), head); 1428 const u8 perm = ptr->perm; 1429 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) { 1430 if (!(perm & (1 << bit))) 1431 continue; 1432 if (first) { 1433 tomoyo_set_group(head, "file "); 1434 first = false; 1435 } else { 1436 tomoyo_set_slash(head); 1437 } 1438 tomoyo_set_string(head, tomoyo_mac_keywords 1439 [tomoyo_pn2mac[bit]]); 1440 } 1441 if (first) 1442 return true; 1443 tomoyo_print_name_union(head, &ptr->name); 1444 tomoyo_print_number_union(head, &ptr->number); 1445 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) { 1446 struct tomoyo_mkdev_acl *ptr = 1447 container_of(acl, typeof(*ptr), head); 1448 const u8 perm = ptr->perm; 1449 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) { 1450 if (!(perm & (1 << bit))) 1451 continue; 1452 if (first) { 1453 tomoyo_set_group(head, "file "); 1454 first = false; 1455 } else { 1456 tomoyo_set_slash(head); 1457 } 1458 tomoyo_set_string(head, tomoyo_mac_keywords 1459 [tomoyo_pnnn2mac[bit]]); 1460 } 1461 if (first) 1462 return true; 1463 tomoyo_print_name_union(head, &ptr->name); 1464 tomoyo_print_number_union(head, &ptr->mode); 1465 tomoyo_print_number_union(head, &ptr->major); 1466 tomoyo_print_number_union(head, &ptr->minor); 1467 } else if (acl_type == TOMOYO_TYPE_INET_ACL) { 1468 struct tomoyo_inet_acl *ptr = 1469 container_of(acl, typeof(*ptr), head); 1470 const u8 perm = ptr->perm; 1471 1472 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) { 1473 if (!(perm & (1 << bit))) 1474 continue; 1475 if (first) { 1476 tomoyo_set_group(head, "network inet "); 1477 tomoyo_set_string(head, tomoyo_proto_keyword 1478 [ptr->protocol]); 1479 tomoyo_set_space(head); 1480 first = false; 1481 } else { 1482 tomoyo_set_slash(head); 1483 } 1484 tomoyo_set_string(head, tomoyo_socket_keyword[bit]); 1485 } 1486 if (first) 1487 return true; 1488 tomoyo_set_space(head); 1489 if (ptr->address.group) { 1490 tomoyo_set_string(head, "@"); 1491 tomoyo_set_string(head, ptr->address.group->group_name 1492 ->name); 1493 } else { 1494 char buf[128]; 1495 tomoyo_print_ip(buf, sizeof(buf), &ptr->address); 1496 tomoyo_io_printf(head, "%s", buf); 1497 } 1498 tomoyo_print_number_union(head, &ptr->port); 1499 } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) { 1500 struct tomoyo_unix_acl *ptr = 1501 container_of(acl, typeof(*ptr), head); 1502 const u8 perm = ptr->perm; 1503 1504 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) { 1505 if (!(perm & (1 << bit))) 1506 continue; 1507 if (first) { 1508 tomoyo_set_group(head, "network unix "); 1509 tomoyo_set_string(head, tomoyo_proto_keyword 1510 [ptr->protocol]); 1511 tomoyo_set_space(head); 1512 first = false; 1513 } else { 1514 tomoyo_set_slash(head); 1515 } 1516 tomoyo_set_string(head, tomoyo_socket_keyword[bit]); 1517 } 1518 if (first) 1519 return true; 1520 tomoyo_print_name_union(head, &ptr->name); 1521 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) { 1522 struct tomoyo_mount_acl *ptr = 1523 container_of(acl, typeof(*ptr), head); 1524 tomoyo_set_group(head, "file mount"); 1525 tomoyo_print_name_union(head, &ptr->dev_name); 1526 tomoyo_print_name_union(head, &ptr->dir_name); 1527 tomoyo_print_name_union(head, &ptr->fs_type); 1528 tomoyo_print_number_union(head, &ptr->flags); 1529 } else if (acl_type == TOMOYO_TYPE_ENV_ACL) { 1530 struct tomoyo_env_acl *ptr = 1531 container_of(acl, typeof(*ptr), head); 1532 1533 tomoyo_set_group(head, "misc env "); 1534 tomoyo_set_string(head, ptr->env->name); 1535 } 1536 if (acl->cond) { 1537 head->r.print_cond_part = true; 1538 head->r.cond_step = 0; 1539 if (!tomoyo_flush(head)) 1540 return false; 1541print_cond_part: 1542 if (!tomoyo_print_condition(head, acl->cond)) 1543 return false; 1544 head->r.print_cond_part = false; 1545 } else { 1546 tomoyo_set_lf(head); 1547 } 1548 return true; 1549} 1550 1551/** 1552 * tomoyo_read_domain2 - Read domain policy. 1553 * 1554 * @head: Pointer to "struct tomoyo_io_buffer". 1555 * @list: Pointer to "struct list_head". 1556 * 1557 * Caller holds tomoyo_read_lock(). 1558 * 1559 * Returns true on success, false otherwise. 1560 */ 1561static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head, 1562 struct list_head *list) 1563{ 1564 list_for_each_cookie(head->r.acl, list) { 1565 struct tomoyo_acl_info *ptr = 1566 list_entry(head->r.acl, typeof(*ptr), list); 1567 if (!tomoyo_print_entry(head, ptr)) 1568 return false; 1569 } 1570 head->r.acl = NULL; 1571 return true; 1572} 1573 1574/** 1575 * tomoyo_read_domain - Read domain policy. 1576 * 1577 * @head: Pointer to "struct tomoyo_io_buffer". 1578 * 1579 * Caller holds tomoyo_read_lock(). 1580 */ 1581static void tomoyo_read_domain(struct tomoyo_io_buffer *head) 1582{ 1583 if (head->r.eof) 1584 return; 1585 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) { 1586 struct tomoyo_domain_info *domain = 1587 list_entry(head->r.domain, typeof(*domain), list); 1588 switch (head->r.step) { 1589 u8 i; 1590 case 0: 1591 if (domain->is_deleted && 1592 !head->r.print_this_domain_only) 1593 continue; 1594 /* Print domainname and flags. */ 1595 tomoyo_set_string(head, domain->domainname->name); 1596 tomoyo_set_lf(head); 1597 tomoyo_io_printf(head, "use_profile %u\n", 1598 domain->profile); 1599 tomoyo_io_printf(head, "use_group %u\n", 1600 domain->group); 1601 for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++) 1602 if (domain->flags[i]) 1603 tomoyo_set_string(head, tomoyo_dif[i]); 1604 head->r.step++; 1605 tomoyo_set_lf(head); 1606 /* fall through */ 1607 case 1: 1608 if (!tomoyo_read_domain2(head, &domain->acl_info_list)) 1609 return; 1610 head->r.step++; 1611 if (!tomoyo_set_lf(head)) 1612 return; 1613 /* fall through */ 1614 case 2: 1615 head->r.step = 0; 1616 if (head->r.print_this_domain_only) 1617 goto done; 1618 } 1619 } 1620 done: 1621 head->r.eof = true; 1622} 1623 1624/** 1625 * tomoyo_write_pid: Specify PID to obtain domainname. 1626 * 1627 * @head: Pointer to "struct tomoyo_io_buffer". 1628 * 1629 * Returns 0. 1630 */ 1631static int tomoyo_write_pid(struct tomoyo_io_buffer *head) 1632{ 1633 head->r.eof = false; 1634 return 0; 1635} 1636 1637/** 1638 * tomoyo_read_pid - Get domainname of the specified PID. 1639 * 1640 * @head: Pointer to "struct tomoyo_io_buffer". 1641 * 1642 * Returns the domainname which the specified PID is in on success, 1643 * empty string otherwise. 1644 * The PID is specified by tomoyo_write_pid() so that the user can obtain 1645 * using read()/write() interface rather than sysctl() interface. 1646 */ 1647static void tomoyo_read_pid(struct tomoyo_io_buffer *head) 1648{ 1649 char *buf = head->write_buf; 1650 bool global_pid = false; 1651 unsigned int pid; 1652 struct task_struct *p; 1653 struct tomoyo_domain_info *domain = NULL; 1654 1655 /* Accessing write_buf is safe because head->io_sem is held. */ 1656 if (!buf) { 1657 head->r.eof = true; 1658 return; /* Do nothing if open(O_RDONLY). */ 1659 } 1660 if (head->r.w_pos || head->r.eof) 1661 return; 1662 head->r.eof = true; 1663 if (tomoyo_str_starts(&buf, "global-pid ")) 1664 global_pid = true; 1665 pid = (unsigned int) simple_strtoul(buf, NULL, 10); 1666 rcu_read_lock(); 1667 if (global_pid) 1668 p = find_task_by_pid_ns(pid, &init_pid_ns); 1669 else 1670 p = find_task_by_vpid(pid); 1671 if (p) 1672 domain = tomoyo_real_domain(p); 1673 rcu_read_unlock(); 1674 if (!domain) 1675 return; 1676 tomoyo_io_printf(head, "%u %u ", pid, domain->profile); 1677 tomoyo_set_string(head, domain->domainname->name); 1678} 1679 1680/* String table for domain transition control keywords. */ 1681static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = { 1682 [TOMOYO_TRANSITION_CONTROL_NO_RESET] = "no_reset_domain ", 1683 [TOMOYO_TRANSITION_CONTROL_RESET] = "reset_domain ", 1684 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ", 1685 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ", 1686 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ", 1687 [TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain ", 1688}; 1689 1690/* String table for grouping keywords. */ 1691static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = { 1692 [TOMOYO_PATH_GROUP] = "path_group ", 1693 [TOMOYO_NUMBER_GROUP] = "number_group ", 1694 [TOMOYO_ADDRESS_GROUP] = "address_group ", 1695}; 1696 1697/** 1698 * tomoyo_write_exception - Write exception policy. 1699 * 1700 * @head: Pointer to "struct tomoyo_io_buffer". 1701 * 1702 * Returns 0 on success, negative value otherwise. 1703 * 1704 * Caller holds tomoyo_read_lock(). 1705 */ 1706static int tomoyo_write_exception(struct tomoyo_io_buffer *head) 1707{ 1708 const bool is_delete = head->w.is_delete; 1709 struct tomoyo_acl_param param = { 1710 .ns = head->w.ns, 1711 .is_delete = is_delete, 1712 .data = head->write_buf, 1713 }; 1714 u8 i; 1715 if (tomoyo_str_starts(¶m.data, "aggregator ")) 1716 return tomoyo_write_aggregator(¶m); 1717 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++) 1718 if (tomoyo_str_starts(¶m.data, tomoyo_transition_type[i])) 1719 return tomoyo_write_transition_control(¶m, i); 1720 for (i = 0; i < TOMOYO_MAX_GROUP; i++) 1721 if (tomoyo_str_starts(¶m.data, tomoyo_group_name[i])) 1722 return tomoyo_write_group(¶m, i); 1723 if (tomoyo_str_starts(¶m.data, "acl_group ")) { 1724 unsigned int group; 1725 char *data; 1726 group = simple_strtoul(param.data, &data, 10); 1727 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ') 1728 return tomoyo_write_domain2 1729 (head->w.ns, &head->w.ns->acl_group[group], 1730 data, is_delete); 1731 } 1732 return -EINVAL; 1733} 1734 1735/** 1736 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list. 1737 * 1738 * @head: Pointer to "struct tomoyo_io_buffer". 1739 * @idx: Index number. 1740 * 1741 * Returns true on success, false otherwise. 1742 * 1743 * Caller holds tomoyo_read_lock(). 1744 */ 1745static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx) 1746{ 1747 struct tomoyo_policy_namespace *ns = 1748 container_of(head->r.ns, typeof(*ns), namespace_list); 1749 struct list_head *list = &ns->group_list[idx]; 1750 list_for_each_cookie(head->r.group, list) { 1751 struct tomoyo_group *group = 1752 list_entry(head->r.group, typeof(*group), head.list); 1753 list_for_each_cookie(head->r.acl, &group->member_list) { 1754 struct tomoyo_acl_head *ptr = 1755 list_entry(head->r.acl, typeof(*ptr), list); 1756 if (ptr->is_deleted) 1757 continue; 1758 if (!tomoyo_flush(head)) 1759 return false; 1760 tomoyo_print_namespace(head); 1761 tomoyo_set_string(head, tomoyo_group_name[idx]); 1762 tomoyo_set_string(head, group->group_name->name); 1763 if (idx == TOMOYO_PATH_GROUP) { 1764 tomoyo_set_space(head); 1765 tomoyo_set_string(head, container_of 1766 (ptr, struct tomoyo_path_group, 1767 head)->member_name->name); 1768 } else if (idx == TOMOYO_NUMBER_GROUP) { 1769 tomoyo_print_number_union(head, &container_of 1770 (ptr, 1771 struct tomoyo_number_group, 1772 head)->number); 1773 } else if (idx == TOMOYO_ADDRESS_GROUP) { 1774 char buffer[128]; 1775 1776 struct tomoyo_address_group *member = 1777 container_of(ptr, typeof(*member), 1778 head); 1779 tomoyo_print_ip(buffer, sizeof(buffer), 1780 &member->address); 1781 tomoyo_io_printf(head, " %s", buffer); 1782 } 1783 tomoyo_set_lf(head); 1784 } 1785 head->r.acl = NULL; 1786 } 1787 head->r.group = NULL; 1788 return true; 1789} 1790 1791/** 1792 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list. 1793 * 1794 * @head: Pointer to "struct tomoyo_io_buffer". 1795 * @idx: Index number. 1796 * 1797 * Returns true on success, false otherwise. 1798 * 1799 * Caller holds tomoyo_read_lock(). 1800 */ 1801static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx) 1802{ 1803 struct tomoyo_policy_namespace *ns = 1804 container_of(head->r.ns, typeof(*ns), namespace_list); 1805 struct list_head *list = &ns->policy_list[idx]; 1806 list_for_each_cookie(head->r.acl, list) { 1807 struct tomoyo_acl_head *acl = 1808 container_of(head->r.acl, typeof(*acl), list); 1809 if (acl->is_deleted) 1810 continue; 1811 if (!tomoyo_flush(head)) 1812 return false; 1813 switch (idx) { 1814 case TOMOYO_ID_TRANSITION_CONTROL: 1815 { 1816 struct tomoyo_transition_control *ptr = 1817 container_of(acl, typeof(*ptr), head); 1818 tomoyo_print_namespace(head); 1819 tomoyo_set_string(head, tomoyo_transition_type 1820 [ptr->type]); 1821 tomoyo_set_string(head, ptr->program ? 1822 ptr->program->name : "any"); 1823 tomoyo_set_string(head, " from "); 1824 tomoyo_set_string(head, ptr->domainname ? 1825 ptr->domainname->name : 1826 "any"); 1827 } 1828 break; 1829 case TOMOYO_ID_AGGREGATOR: 1830 { 1831 struct tomoyo_aggregator *ptr = 1832 container_of(acl, typeof(*ptr), head); 1833 tomoyo_print_namespace(head); 1834 tomoyo_set_string(head, "aggregator "); 1835 tomoyo_set_string(head, 1836 ptr->original_name->name); 1837 tomoyo_set_space(head); 1838 tomoyo_set_string(head, 1839 ptr->aggregated_name->name); 1840 } 1841 break; 1842 default: 1843 continue; 1844 } 1845 tomoyo_set_lf(head); 1846 } 1847 head->r.acl = NULL; 1848 return true; 1849} 1850 1851/** 1852 * tomoyo_read_exception - Read exception policy. 1853 * 1854 * @head: Pointer to "struct tomoyo_io_buffer". 1855 * 1856 * Caller holds tomoyo_read_lock(). 1857 */ 1858static void tomoyo_read_exception(struct tomoyo_io_buffer *head) 1859{ 1860 struct tomoyo_policy_namespace *ns = 1861 container_of(head->r.ns, typeof(*ns), namespace_list); 1862 if (head->r.eof) 1863 return; 1864 while (head->r.step < TOMOYO_MAX_POLICY && 1865 tomoyo_read_policy(head, head->r.step)) 1866 head->r.step++; 1867 if (head->r.step < TOMOYO_MAX_POLICY) 1868 return; 1869 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP && 1870 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY)) 1871 head->r.step++; 1872 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP) 1873 return; 1874 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP 1875 + TOMOYO_MAX_ACL_GROUPS) { 1876 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY 1877 - TOMOYO_MAX_GROUP; 1878 if (!tomoyo_read_domain2(head, &ns->acl_group 1879 [head->r.acl_group_index])) 1880 return; 1881 head->r.step++; 1882 } 1883 head->r.eof = true; 1884} 1885 1886/* Wait queue for kernel -> userspace notification. */ 1887static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait); 1888/* Wait queue for userspace -> kernel notification. */ 1889static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait); 1890 1891/* Structure for query. */ 1892struct tomoyo_query { 1893 struct list_head list; 1894 char *query; 1895 size_t query_len; 1896 unsigned int serial; 1897 u8 timer; 1898 u8 answer; 1899 u8 retry; 1900}; 1901 1902/* The list for "struct tomoyo_query". */ 1903static LIST_HEAD(tomoyo_query_list); 1904 1905/* Lock for manipulating tomoyo_query_list. */ 1906static DEFINE_SPINLOCK(tomoyo_query_list_lock); 1907 1908/* 1909 * Number of "struct file" referring /sys/kernel/security/tomoyo/query 1910 * interface. 1911 */ 1912static atomic_t tomoyo_query_observers = ATOMIC_INIT(0); 1913 1914/** 1915 * tomoyo_truncate - Truncate a line. 1916 * 1917 * @str: String to truncate. 1918 * 1919 * Returns length of truncated @str. 1920 */ 1921static int tomoyo_truncate(char *str) 1922{ 1923 char *start = str; 1924 while (*(unsigned char *) str > (unsigned char) ' ') 1925 str++; 1926 *str = '\0'; 1927 return strlen(start) + 1; 1928} 1929 1930/** 1931 * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode. 1932 * 1933 * @domain: Pointer to "struct tomoyo_domain_info". 1934 * @header: Lines containing ACL. 1935 * 1936 * Returns nothing. 1937 */ 1938static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header) 1939{ 1940 char *buffer; 1941 char *realpath = NULL; 1942 char *argv0 = NULL; 1943 char *symlink = NULL; 1944 char *cp = strchr(header, '\n'); 1945 int len; 1946 if (!cp) 1947 return; 1948 cp = strchr(cp + 1, '\n'); 1949 if (!cp) 1950 return; 1951 *cp++ = '\0'; 1952 len = strlen(cp) + 1; 1953 /* strstr() will return NULL if ordering is wrong. */ 1954 if (*cp == 'f') { 1955 argv0 = strstr(header, " argv[]={ \""); 1956 if (argv0) { 1957 argv0 += 10; 1958 len += tomoyo_truncate(argv0) + 14; 1959 } 1960 realpath = strstr(header, " exec={ realpath=\""); 1961 if (realpath) { 1962 realpath += 8; 1963 len += tomoyo_truncate(realpath) + 6; 1964 } 1965 symlink = strstr(header, " symlink.target=\""); 1966 if (symlink) 1967 len += tomoyo_truncate(symlink + 1) + 1; 1968 } 1969 buffer = kmalloc(len, GFP_NOFS); 1970 if (!buffer) 1971 return; 1972 snprintf(buffer, len - 1, "%s", cp); 1973 if (realpath) 1974 tomoyo_addprintf(buffer, len, " exec.%s", realpath); 1975 if (argv0) 1976 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0); 1977 if (symlink) 1978 tomoyo_addprintf(buffer, len, "%s", symlink); 1979 tomoyo_normalize_line(buffer); 1980 if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer, 1981 false)) 1982 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES); 1983 kfree(buffer); 1984} 1985 1986/** 1987 * tomoyo_supervisor - Ask for the supervisor's decision. 1988 * 1989 * @r: Pointer to "struct tomoyo_request_info". 1990 * @fmt: The printf()'s format string, followed by parameters. 1991 * 1992 * Returns 0 if the supervisor decided to permit the access request which 1993 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the 1994 * supervisor decided to retry the access request which violated the policy in 1995 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise. 1996 */ 1997int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) 1998{ 1999 va_list args; 2000 int error; 2001 int len; 2002 static unsigned int tomoyo_serial; 2003 struct tomoyo_query entry = { }; 2004 bool quota_exceeded = false; 2005 va_start(args, fmt); 2006 len = vsnprintf((char *) &len, 1, fmt, args) + 1; 2007 va_end(args); 2008 /* Write /sys/kernel/security/tomoyo/audit. */ 2009 va_start(args, fmt); 2010 tomoyo_write_log2(r, len, fmt, args); 2011 va_end(args); 2012 /* Nothing more to do if granted. */ 2013 if (r->granted) 2014 return 0; 2015 if (r->mode) 2016 tomoyo_update_stat(r->mode); 2017 switch (r->mode) { 2018 case TOMOYO_CONFIG_ENFORCING: 2019 error = -EPERM; 2020 if (atomic_read(&tomoyo_query_observers)) 2021 break; 2022 goto out; 2023 case TOMOYO_CONFIG_LEARNING: 2024 error = 0; 2025 /* Check max_learning_entry parameter. */ 2026 if (tomoyo_domain_quota_is_ok(r)) 2027 break; 2028 /* fall through */ 2029 default: 2030 return 0; 2031 } 2032 /* Get message. */ 2033 va_start(args, fmt); 2034 entry.query = tomoyo_init_log(r, len, fmt, args); 2035 va_end(args); 2036 if (!entry.query) 2037 goto out; 2038 entry.query_len = strlen(entry.query) + 1; 2039 if (!error) { 2040 tomoyo_add_entry(r->domain, entry.query); 2041 goto out; 2042 } 2043 len = tomoyo_round2(entry.query_len); 2044 spin_lock(&tomoyo_query_list_lock); 2045 if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] && 2046 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len 2047 >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) { 2048 quota_exceeded = true; 2049 } else { 2050 entry.serial = tomoyo_serial++; 2051 entry.retry = r->retry; 2052 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len; 2053 list_add_tail(&entry.list, &tomoyo_query_list); 2054 } 2055 spin_unlock(&tomoyo_query_list_lock); 2056 if (quota_exceeded) 2057 goto out; 2058 /* Give 10 seconds for supervisor's opinion. */ 2059 while (entry.timer < 10) { 2060 wake_up_all(&tomoyo_query_wait); 2061 if (wait_event_interruptible_timeout 2062 (tomoyo_answer_wait, entry.answer || 2063 !atomic_read(&tomoyo_query_observers), HZ)) 2064 break; 2065 else 2066 entry.timer++; 2067 } 2068 spin_lock(&tomoyo_query_list_lock); 2069 list_del(&entry.list); 2070 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len; 2071 spin_unlock(&tomoyo_query_list_lock); 2072 switch (entry.answer) { 2073 case 3: /* Asked to retry by administrator. */ 2074 error = TOMOYO_RETRY_REQUEST; 2075 r->retry++; 2076 break; 2077 case 1: 2078 /* Granted by administrator. */ 2079 error = 0; 2080 break; 2081 default: 2082 /* Timed out or rejected by administrator. */ 2083 break; 2084 } 2085out: 2086 kfree(entry.query); 2087 return error; 2088} 2089 2090/** 2091 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query. 2092 * 2093 * @file: Pointer to "struct file". 2094 * @wait: Pointer to "poll_table". 2095 * 2096 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. 2097 * 2098 * Waits for access requests which violated policy in enforcing mode. 2099 */ 2100static int tomoyo_poll_query(struct file *file, poll_table *wait) 2101{ 2102 struct list_head *tmp; 2103 bool found = false; 2104 u8 i; 2105 for (i = 0; i < 2; i++) { 2106 spin_lock(&tomoyo_query_list_lock); 2107 list_for_each(tmp, &tomoyo_query_list) { 2108 struct tomoyo_query *ptr = 2109 list_entry(tmp, typeof(*ptr), list); 2110 if (ptr->answer) 2111 continue; 2112 found = true; 2113 break; 2114 } 2115 spin_unlock(&tomoyo_query_list_lock); 2116 if (found) 2117 return POLLIN | POLLRDNORM; 2118 if (i) 2119 break; 2120 poll_wait(file, &tomoyo_query_wait, wait); 2121 } 2122 return 0; 2123} 2124 2125/** 2126 * tomoyo_read_query - Read access requests which violated policy in enforcing mode. 2127 * 2128 * @head: Pointer to "struct tomoyo_io_buffer". 2129 */ 2130static void tomoyo_read_query(struct tomoyo_io_buffer *head) 2131{ 2132 struct list_head *tmp; 2133 unsigned int pos = 0; 2134 size_t len = 0; 2135 char *buf; 2136 if (head->r.w_pos) 2137 return; 2138 if (head->read_buf) { 2139 kfree(head->read_buf); 2140 head->read_buf = NULL; 2141 } 2142 spin_lock(&tomoyo_query_list_lock); 2143 list_for_each(tmp, &tomoyo_query_list) { 2144 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2145 if (ptr->answer) 2146 continue; 2147 if (pos++ != head->r.query_index) 2148 continue; 2149 len = ptr->query_len; 2150 break; 2151 } 2152 spin_unlock(&tomoyo_query_list_lock); 2153 if (!len) { 2154 head->r.query_index = 0; 2155 return; 2156 } 2157 buf = kzalloc(len + 32, GFP_NOFS); 2158 if (!buf) 2159 return; 2160 pos = 0; 2161 spin_lock(&tomoyo_query_list_lock); 2162 list_for_each(tmp, &tomoyo_query_list) { 2163 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2164 if (ptr->answer) 2165 continue; 2166 if (pos++ != head->r.query_index) 2167 continue; 2168 /* 2169 * Some query can be skipped because tomoyo_query_list 2170 * can change, but I don't care. 2171 */ 2172 if (len == ptr->query_len) 2173 snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial, 2174 ptr->retry, ptr->query); 2175 break; 2176 } 2177 spin_unlock(&tomoyo_query_list_lock); 2178 if (buf[0]) { 2179 head->read_buf = buf; 2180 head->r.w[head->r.w_pos++] = buf; 2181 head->r.query_index++; 2182 } else { 2183 kfree(buf); 2184 } 2185} 2186 2187/** 2188 * tomoyo_write_answer - Write the supervisor's decision. 2189 * 2190 * @head: Pointer to "struct tomoyo_io_buffer". 2191 * 2192 * Returns 0 on success, -EINVAL otherwise. 2193 */ 2194static int tomoyo_write_answer(struct tomoyo_io_buffer *head) 2195{ 2196 char *data = head->write_buf; 2197 struct list_head *tmp; 2198 unsigned int serial; 2199 unsigned int answer; 2200 spin_lock(&tomoyo_query_list_lock); 2201 list_for_each(tmp, &tomoyo_query_list) { 2202 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2203 ptr->timer = 0; 2204 } 2205 spin_unlock(&tomoyo_query_list_lock); 2206 if (sscanf(data, "A%u=%u", &serial, &answer) != 2) 2207 return -EINVAL; 2208 spin_lock(&tomoyo_query_list_lock); 2209 list_for_each(tmp, &tomoyo_query_list) { 2210 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2211 if (ptr->serial != serial) 2212 continue; 2213 if (!ptr->answer) 2214 ptr->answer = answer; 2215 break; 2216 } 2217 spin_unlock(&tomoyo_query_list_lock); 2218 return 0; 2219} 2220 2221/** 2222 * tomoyo_read_version: Get version. 2223 * 2224 * @head: Pointer to "struct tomoyo_io_buffer". 2225 * 2226 * Returns version information. 2227 */ 2228static void tomoyo_read_version(struct tomoyo_io_buffer *head) 2229{ 2230 if (!head->r.eof) { 2231 tomoyo_io_printf(head, "2.5.0"); 2232 head->r.eof = true; 2233 } 2234} 2235 2236/* String table for /sys/kernel/security/tomoyo/stat interface. */ 2237static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = { 2238 [TOMOYO_STAT_POLICY_UPDATES] = "update:", 2239 [TOMOYO_STAT_POLICY_LEARNING] = "violation in learning mode:", 2240 [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:", 2241 [TOMOYO_STAT_POLICY_ENFORCING] = "violation in enforcing mode:", 2242}; 2243 2244/* String table for /sys/kernel/security/tomoyo/stat interface. */ 2245static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = { 2246 [TOMOYO_MEMORY_POLICY] = "policy:", 2247 [TOMOYO_MEMORY_AUDIT] = "audit log:", 2248 [TOMOYO_MEMORY_QUERY] = "query message:", 2249}; 2250 2251/* Timestamp counter for last updated. */ 2252static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT]; 2253/* Counter for number of updates. */ 2254static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT]; 2255 2256/** 2257 * tomoyo_update_stat - Update statistic counters. 2258 * 2259 * @index: Index for policy type. 2260 * 2261 * Returns nothing. 2262 */ 2263void tomoyo_update_stat(const u8 index) 2264{ 2265 struct timeval tv; 2266 do_gettimeofday(&tv); 2267 /* 2268 * I don't use atomic operations because race condition is not fatal. 2269 */ 2270 tomoyo_stat_updated[index]++; 2271 tomoyo_stat_modified[index] = tv.tv_sec; 2272} 2273 2274/** 2275 * tomoyo_read_stat - Read statistic data. 2276 * 2277 * @head: Pointer to "struct tomoyo_io_buffer". 2278 * 2279 * Returns nothing. 2280 */ 2281static void tomoyo_read_stat(struct tomoyo_io_buffer *head) 2282{ 2283 u8 i; 2284 unsigned int total = 0; 2285 if (head->r.eof) 2286 return; 2287 for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) { 2288 tomoyo_io_printf(head, "Policy %-30s %10u", 2289 tomoyo_policy_headers[i], 2290 tomoyo_stat_updated[i]); 2291 if (tomoyo_stat_modified[i]) { 2292 struct tomoyo_time stamp; 2293 tomoyo_convert_time(tomoyo_stat_modified[i], &stamp); 2294 tomoyo_io_printf(head, " (Last: %04u/%02u/%02u " 2295 "%02u:%02u:%02u)", 2296 stamp.year, stamp.month, stamp.day, 2297 stamp.hour, stamp.min, stamp.sec); 2298 } 2299 tomoyo_set_lf(head); 2300 } 2301 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) { 2302 unsigned int used = tomoyo_memory_used[i]; 2303 total += used; 2304 tomoyo_io_printf(head, "Memory used by %-22s %10u", 2305 tomoyo_memory_headers[i], used); 2306 used = tomoyo_memory_quota[i]; 2307 if (used) 2308 tomoyo_io_printf(head, " (Quota: %10u)", used); 2309 tomoyo_set_lf(head); 2310 } 2311 tomoyo_io_printf(head, "Total memory used: %10u\n", 2312 total); 2313 head->r.eof = true; 2314} 2315 2316/** 2317 * tomoyo_write_stat - Set memory quota. 2318 * 2319 * @head: Pointer to "struct tomoyo_io_buffer". 2320 * 2321 * Returns 0. 2322 */ 2323static int tomoyo_write_stat(struct tomoyo_io_buffer *head) 2324{ 2325 char *data = head->write_buf; 2326 u8 i; 2327 if (tomoyo_str_starts(&data, "Memory used by ")) 2328 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) 2329 if (tomoyo_str_starts(&data, tomoyo_memory_headers[i])) 2330 sscanf(data, "%u", &tomoyo_memory_quota[i]); 2331 return 0; 2332} 2333 2334/** 2335 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. 2336 * 2337 * @type: Type of interface. 2338 * @file: Pointer to "struct file". 2339 * 2340 * Returns 0 on success, negative value otherwise. 2341 */ 2342int tomoyo_open_control(const u8 type, struct file *file) 2343{ 2344 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS); 2345 2346 if (!head) 2347 return -ENOMEM; 2348 mutex_init(&head->io_sem); 2349 head->type = type; 2350 switch (type) { 2351 case TOMOYO_DOMAINPOLICY: 2352 /* /sys/kernel/security/tomoyo/domain_policy */ 2353 head->write = tomoyo_write_domain; 2354 head->read = tomoyo_read_domain; 2355 break; 2356 case TOMOYO_EXCEPTIONPOLICY: 2357 /* /sys/kernel/security/tomoyo/exception_policy */ 2358 head->write = tomoyo_write_exception; 2359 head->read = tomoyo_read_exception; 2360 break; 2361 case TOMOYO_AUDIT: 2362 /* /sys/kernel/security/tomoyo/audit */ 2363 head->poll = tomoyo_poll_log; 2364 head->read = tomoyo_read_log; 2365 break; 2366 case TOMOYO_PROCESS_STATUS: 2367 /* /sys/kernel/security/tomoyo/.process_status */ 2368 head->write = tomoyo_write_pid; 2369 head->read = tomoyo_read_pid; 2370 break; 2371 case TOMOYO_VERSION: 2372 /* /sys/kernel/security/tomoyo/version */ 2373 head->read = tomoyo_read_version; 2374 head->readbuf_size = 128; 2375 break; 2376 case TOMOYO_STAT: 2377 /* /sys/kernel/security/tomoyo/stat */ 2378 head->write = tomoyo_write_stat; 2379 head->read = tomoyo_read_stat; 2380 head->readbuf_size = 1024; 2381 break; 2382 case TOMOYO_PROFILE: 2383 /* /sys/kernel/security/tomoyo/profile */ 2384 head->write = tomoyo_write_profile; 2385 head->read = tomoyo_read_profile; 2386 break; 2387 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */ 2388 head->poll = tomoyo_poll_query; 2389 head->write = tomoyo_write_answer; 2390 head->read = tomoyo_read_query; 2391 break; 2392 case TOMOYO_MANAGER: 2393 /* /sys/kernel/security/tomoyo/manager */ 2394 head->write = tomoyo_write_manager; 2395 head->read = tomoyo_read_manager; 2396 break; 2397 } 2398 if (!(file->f_mode & FMODE_READ)) { 2399 /* 2400 * No need to allocate read_buf since it is not opened 2401 * for reading. 2402 */ 2403 head->read = NULL; 2404 head->poll = NULL; 2405 } else if (!head->poll) { 2406 /* Don't allocate read_buf for poll() access. */ 2407 if (!head->readbuf_size) 2408 head->readbuf_size = 4096 * 2; 2409 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS); 2410 if (!head->read_buf) { 2411 kfree(head); 2412 return -ENOMEM; 2413 } 2414 } 2415 if (!(file->f_mode & FMODE_WRITE)) { 2416 /* 2417 * No need to allocate write_buf since it is not opened 2418 * for writing. 2419 */ 2420 head->write = NULL; 2421 } else if (head->write) { 2422 head->writebuf_size = 4096 * 2; 2423 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS); 2424 if (!head->write_buf) { 2425 kfree(head->read_buf); 2426 kfree(head); 2427 return -ENOMEM; 2428 } 2429 } 2430 /* 2431 * If the file is /sys/kernel/security/tomoyo/query , increment the 2432 * observer counter. 2433 * The obserber counter is used by tomoyo_supervisor() to see if 2434 * there is some process monitoring /sys/kernel/security/tomoyo/query. 2435 */ 2436 if (type == TOMOYO_QUERY) 2437 atomic_inc(&tomoyo_query_observers); 2438 file->private_data = head; 2439 tomoyo_notify_gc(head, true); 2440 return 0; 2441} 2442 2443/** 2444 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface. 2445 * 2446 * @file: Pointer to "struct file". 2447 * @wait: Pointer to "poll_table". 2448 * 2449 * Waits for read readiness. 2450 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and 2451 * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd. 2452 */ 2453int tomoyo_poll_control(struct file *file, poll_table *wait) 2454{ 2455 struct tomoyo_io_buffer *head = file->private_data; 2456 if (!head->poll) 2457 return -ENOSYS; 2458 return head->poll(file, wait); 2459} 2460 2461/** 2462 * tomoyo_set_namespace_cursor - Set namespace to read. 2463 * 2464 * @head: Pointer to "struct tomoyo_io_buffer". 2465 * 2466 * Returns nothing. 2467 */ 2468static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head) 2469{ 2470 struct list_head *ns; 2471 if (head->type != TOMOYO_EXCEPTIONPOLICY && 2472 head->type != TOMOYO_PROFILE) 2473 return; 2474 /* 2475 * If this is the first read, or reading previous namespace finished 2476 * and has more namespaces to read, update the namespace cursor. 2477 */ 2478 ns = head->r.ns; 2479 if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) { 2480 /* Clearing is OK because tomoyo_flush() returned true. */ 2481 memset(&head->r, 0, sizeof(head->r)); 2482 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next; 2483 } 2484} 2485 2486/** 2487 * tomoyo_has_more_namespace - Check for unread namespaces. 2488 * 2489 * @head: Pointer to "struct tomoyo_io_buffer". 2490 * 2491 * Returns true if we have more entries to print, false otherwise. 2492 */ 2493static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head) 2494{ 2495 return (head->type == TOMOYO_EXCEPTIONPOLICY || 2496 head->type == TOMOYO_PROFILE) && head->r.eof && 2497 head->r.ns->next != &tomoyo_namespace_list; 2498} 2499 2500/** 2501 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. 2502 * 2503 * @head: Pointer to "struct tomoyo_io_buffer". 2504 * @buffer: Poiner to buffer to write to. 2505 * @buffer_len: Size of @buffer. 2506 * 2507 * Returns bytes read on success, negative value otherwise. 2508 */ 2509ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer, 2510 const int buffer_len) 2511{ 2512 int len; 2513 int idx; 2514 2515 if (!head->read) 2516 return -ENOSYS; 2517 if (mutex_lock_interruptible(&head->io_sem)) 2518 return -EINTR; 2519 head->read_user_buf = buffer; 2520 head->read_user_buf_avail = buffer_len; 2521 idx = tomoyo_read_lock(); 2522 if (tomoyo_flush(head)) 2523 /* Call the policy handler. */ 2524 do { 2525 tomoyo_set_namespace_cursor(head); 2526 head->read(head); 2527 } while (tomoyo_flush(head) && 2528 tomoyo_has_more_namespace(head)); 2529 tomoyo_read_unlock(idx); 2530 len = head->read_user_buf - buffer; 2531 mutex_unlock(&head->io_sem); 2532 return len; 2533} 2534 2535/** 2536 * tomoyo_parse_policy - Parse a policy line. 2537 * 2538 * @head: Poiter to "struct tomoyo_io_buffer". 2539 * @line: Line to parse. 2540 * 2541 * Returns 0 on success, negative value otherwise. 2542 * 2543 * Caller holds tomoyo_read_lock(). 2544 */ 2545static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line) 2546{ 2547 /* Delete request? */ 2548 head->w.is_delete = !strncmp(line, "delete ", 7); 2549 if (head->w.is_delete) 2550 memmove(line, line + 7, strlen(line + 7) + 1); 2551 /* Selecting namespace to update. */ 2552 if (head->type == TOMOYO_EXCEPTIONPOLICY || 2553 head->type == TOMOYO_PROFILE) { 2554 if (*line == '<') { 2555 char *cp = strchr(line, ' '); 2556 if (cp) { 2557 *cp++ = '\0'; 2558 head->w.ns = tomoyo_assign_namespace(line); 2559 memmove(line, cp, strlen(cp) + 1); 2560 } else 2561 head->w.ns = NULL; 2562 } else 2563 head->w.ns = &tomoyo_kernel_namespace; 2564 /* Don't allow updating if namespace is invalid. */ 2565 if (!head->w.ns) 2566 return -ENOENT; 2567 } 2568 /* Do the update. */ 2569 return head->write(head); 2570} 2571 2572/** 2573 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. 2574 * 2575 * @head: Pointer to "struct tomoyo_io_buffer". 2576 * @buffer: Pointer to buffer to read from. 2577 * @buffer_len: Size of @buffer. 2578 * 2579 * Returns @buffer_len on success, negative value otherwise. 2580 */ 2581ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head, 2582 const char __user *buffer, const int buffer_len) 2583{ 2584 int error = buffer_len; 2585 size_t avail_len = buffer_len; 2586 char *cp0 = head->write_buf; 2587 int idx; 2588 if (!head->write) 2589 return -ENOSYS; 2590 if (!access_ok(VERIFY_READ, buffer, buffer_len)) 2591 return -EFAULT; 2592 if (mutex_lock_interruptible(&head->io_sem)) 2593 return -EINTR; 2594 head->read_user_buf_avail = 0; 2595 idx = tomoyo_read_lock(); 2596 /* Read a line and dispatch it to the policy handler. */ 2597 while (avail_len > 0) { 2598 char c; 2599 if (head->w.avail >= head->writebuf_size - 1) { 2600 const int len = head->writebuf_size * 2; 2601 char *cp = kzalloc(len, GFP_NOFS); 2602 if (!cp) { 2603 error = -ENOMEM; 2604 break; 2605 } 2606 memmove(cp, cp0, head->w.avail); 2607 kfree(cp0); 2608 head->write_buf = cp; 2609 cp0 = cp; 2610 head->writebuf_size = len; 2611 } 2612 if (get_user(c, buffer)) { 2613 error = -EFAULT; 2614 break; 2615 } 2616 buffer++; 2617 avail_len--; 2618 cp0[head->w.avail++] = c; 2619 if (c != '\n') 2620 continue; 2621 cp0[head->w.avail - 1] = '\0'; 2622 head->w.avail = 0; 2623 tomoyo_normalize_line(cp0); 2624 if (!strcmp(cp0, "reset")) { 2625 head->w.ns = &tomoyo_kernel_namespace; 2626 head->w.domain = NULL; 2627 memset(&head->r, 0, sizeof(head->r)); 2628 continue; 2629 } 2630 /* Don't allow updating policies by non manager programs. */ 2631 switch (head->type) { 2632 case TOMOYO_PROCESS_STATUS: 2633 /* This does not write anything. */ 2634 break; 2635 case TOMOYO_DOMAINPOLICY: 2636 if (tomoyo_select_domain(head, cp0)) 2637 continue; 2638 /* fall through */ 2639 case TOMOYO_EXCEPTIONPOLICY: 2640 if (!strcmp(cp0, "select transition_only")) { 2641 head->r.print_transition_related_only = true; 2642 continue; 2643 } 2644 /* fall through */ 2645 default: 2646 if (!tomoyo_manager()) { 2647 error = -EPERM; 2648 goto out; 2649 } 2650 } 2651 switch (tomoyo_parse_policy(head, cp0)) { 2652 case -EPERM: 2653 error = -EPERM; 2654 goto out; 2655 case 0: 2656 switch (head->type) { 2657 case TOMOYO_DOMAINPOLICY: 2658 case TOMOYO_EXCEPTIONPOLICY: 2659 case TOMOYO_STAT: 2660 case TOMOYO_PROFILE: 2661 case TOMOYO_MANAGER: 2662 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES); 2663 break; 2664 default: 2665 break; 2666 } 2667 break; 2668 } 2669 } 2670out: 2671 tomoyo_read_unlock(idx); 2672 mutex_unlock(&head->io_sem); 2673 return error; 2674} 2675 2676/** 2677 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. 2678 * 2679 * @head: Pointer to "struct tomoyo_io_buffer". 2680 * 2681 * Returns 0. 2682 */ 2683int 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 return 0; 2694} 2695 2696/** 2697 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined. 2698 */ 2699void tomoyo_check_profile(void) 2700{ 2701 struct tomoyo_domain_info *domain; 2702 const int idx = tomoyo_read_lock(); 2703 tomoyo_policy_loaded = true; 2704 printk(KERN_INFO "TOMOYO: 2.5.0\n"); 2705 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 2706 const u8 profile = domain->profile; 2707 const struct tomoyo_policy_namespace *ns = domain->ns; 2708 if (ns->profile_version != 20110903) 2709 printk(KERN_ERR 2710 "Profile version %u is not supported.\n", 2711 ns->profile_version); 2712 else if (!ns->profile_ptr[profile]) 2713 printk(KERN_ERR 2714 "Profile %u (used by '%s') is not defined.\n", 2715 profile, domain->domainname->name); 2716 else 2717 continue; 2718 printk(KERN_ERR 2719 "Userland tools for TOMOYO 2.5 must be installed and " 2720 "policy must be initialized.\n"); 2721 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ " 2722 "for more information.\n"); 2723 panic("STOP!"); 2724 } 2725 tomoyo_read_unlock(idx); 2726 printk(KERN_INFO "Mandatory Access Control activated.\n"); 2727} 2728 2729/** 2730 * tomoyo_load_builtin_policy - Load built-in policy. 2731 * 2732 * Returns nothing. 2733 */ 2734void __init tomoyo_load_builtin_policy(void) 2735{ 2736 /* 2737 * This include file is manually created and contains built-in policy 2738 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy", 2739 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager", 2740 * "tomoyo_builtin_stat" in the form of "static char [] __initdata". 2741 */ 2742#include "builtin-policy.h" 2743 u8 i; 2744 const int idx = tomoyo_read_lock(); 2745 for (i = 0; i < 5; i++) { 2746 struct tomoyo_io_buffer head = { }; 2747 char *start = ""; 2748 switch (i) { 2749 case 0: 2750 start = tomoyo_builtin_profile; 2751 head.type = TOMOYO_PROFILE; 2752 head.write = tomoyo_write_profile; 2753 break; 2754 case 1: 2755 start = tomoyo_builtin_exception_policy; 2756 head.type = TOMOYO_EXCEPTIONPOLICY; 2757 head.write = tomoyo_write_exception; 2758 break; 2759 case 2: 2760 start = tomoyo_builtin_domain_policy; 2761 head.type = TOMOYO_DOMAINPOLICY; 2762 head.write = tomoyo_write_domain; 2763 break; 2764 case 3: 2765 start = tomoyo_builtin_manager; 2766 head.type = TOMOYO_MANAGER; 2767 head.write = tomoyo_write_manager; 2768 break; 2769 case 4: 2770 start = tomoyo_builtin_stat; 2771 head.type = TOMOYO_STAT; 2772 head.write = tomoyo_write_stat; 2773 break; 2774 } 2775 while (1) { 2776 char *end = strchr(start, '\n'); 2777 if (!end) 2778 break; 2779 *end = '\0'; 2780 tomoyo_normalize_line(start); 2781 head.write_buf = start; 2782 tomoyo_parse_policy(&head, start); 2783 start = end + 1; 2784 } 2785 } 2786 tomoyo_read_unlock(idx); 2787#ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER 2788 tomoyo_check_profile(); 2789#endif 2790} 2791