1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * security/tomoyo/common.c 4 * 5 * Copyright (C) 2005-2011 NTT DATA CORPORATION 6 */ 7 8 #include <linux/uaccess.h> 9 #include <linux/slab.h> 10 #include <linux/security.h> 11 #include "common.h" 12 13 /* String table for operation mode. */ 14 const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = { 15 [TOMOYO_CONFIG_DISABLED] = "disabled", 16 [TOMOYO_CONFIG_LEARNING] = "learning", 17 [TOMOYO_CONFIG_PERMISSIVE] = "permissive", 18 [TOMOYO_CONFIG_ENFORCING] = "enforcing" 19 }; 20 21 /* String table for /sys/kernel/security/tomoyo/profile */ 22 const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX 23 + TOMOYO_MAX_MAC_CATEGORY_INDEX] = { 24 /* CONFIG::file group */ 25 [TOMOYO_MAC_FILE_EXECUTE] = "execute", 26 [TOMOYO_MAC_FILE_OPEN] = "open", 27 [TOMOYO_MAC_FILE_CREATE] = "create", 28 [TOMOYO_MAC_FILE_UNLINK] = "unlink", 29 [TOMOYO_MAC_FILE_GETATTR] = "getattr", 30 [TOMOYO_MAC_FILE_MKDIR] = "mkdir", 31 [TOMOYO_MAC_FILE_RMDIR] = "rmdir", 32 [TOMOYO_MAC_FILE_MKFIFO] = "mkfifo", 33 [TOMOYO_MAC_FILE_MKSOCK] = "mksock", 34 [TOMOYO_MAC_FILE_TRUNCATE] = "truncate", 35 [TOMOYO_MAC_FILE_SYMLINK] = "symlink", 36 [TOMOYO_MAC_FILE_MKBLOCK] = "mkblock", 37 [TOMOYO_MAC_FILE_MKCHAR] = "mkchar", 38 [TOMOYO_MAC_FILE_LINK] = "link", 39 [TOMOYO_MAC_FILE_RENAME] = "rename", 40 [TOMOYO_MAC_FILE_CHMOD] = "chmod", 41 [TOMOYO_MAC_FILE_CHOWN] = "chown", 42 [TOMOYO_MAC_FILE_CHGRP] = "chgrp", 43 [TOMOYO_MAC_FILE_IOCTL] = "ioctl", 44 [TOMOYO_MAC_FILE_CHROOT] = "chroot", 45 [TOMOYO_MAC_FILE_MOUNT] = "mount", 46 [TOMOYO_MAC_FILE_UMOUNT] = "unmount", 47 [TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root", 48 /* CONFIG::network group */ 49 [TOMOYO_MAC_NETWORK_INET_STREAM_BIND] = "inet_stream_bind", 50 [TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN] = "inet_stream_listen", 51 [TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT] = "inet_stream_connect", 52 [TOMOYO_MAC_NETWORK_INET_DGRAM_BIND] = "inet_dgram_bind", 53 [TOMOYO_MAC_NETWORK_INET_DGRAM_SEND] = "inet_dgram_send", 54 [TOMOYO_MAC_NETWORK_INET_RAW_BIND] = "inet_raw_bind", 55 [TOMOYO_MAC_NETWORK_INET_RAW_SEND] = "inet_raw_send", 56 [TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND] = "unix_stream_bind", 57 [TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN] = "unix_stream_listen", 58 [TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT] = "unix_stream_connect", 59 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND] = "unix_dgram_bind", 60 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND] = "unix_dgram_send", 61 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND] = "unix_seqpacket_bind", 62 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN] = "unix_seqpacket_listen", 63 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = "unix_seqpacket_connect", 64 /* CONFIG::misc group */ 65 [TOMOYO_MAC_ENVIRON] = "env", 66 /* CONFIG group */ 67 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file", 68 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_NETWORK] = "network", 69 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_MISC] = "misc", 70 }; 71 72 /* String table for conditions. */ 73 const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = { 74 [TOMOYO_TASK_UID] = "task.uid", 75 [TOMOYO_TASK_EUID] = "task.euid", 76 [TOMOYO_TASK_SUID] = "task.suid", 77 [TOMOYO_TASK_FSUID] = "task.fsuid", 78 [TOMOYO_TASK_GID] = "task.gid", 79 [TOMOYO_TASK_EGID] = "task.egid", 80 [TOMOYO_TASK_SGID] = "task.sgid", 81 [TOMOYO_TASK_FSGID] = "task.fsgid", 82 [TOMOYO_TASK_PID] = "task.pid", 83 [TOMOYO_TASK_PPID] = "task.ppid", 84 [TOMOYO_EXEC_ARGC] = "exec.argc", 85 [TOMOYO_EXEC_ENVC] = "exec.envc", 86 [TOMOYO_TYPE_IS_SOCKET] = "socket", 87 [TOMOYO_TYPE_IS_SYMLINK] = "symlink", 88 [TOMOYO_TYPE_IS_FILE] = "file", 89 [TOMOYO_TYPE_IS_BLOCK_DEV] = "block", 90 [TOMOYO_TYPE_IS_DIRECTORY] = "directory", 91 [TOMOYO_TYPE_IS_CHAR_DEV] = "char", 92 [TOMOYO_TYPE_IS_FIFO] = "fifo", 93 [TOMOYO_MODE_SETUID] = "setuid", 94 [TOMOYO_MODE_SETGID] = "setgid", 95 [TOMOYO_MODE_STICKY] = "sticky", 96 [TOMOYO_MODE_OWNER_READ] = "owner_read", 97 [TOMOYO_MODE_OWNER_WRITE] = "owner_write", 98 [TOMOYO_MODE_OWNER_EXECUTE] = "owner_execute", 99 [TOMOYO_MODE_GROUP_READ] = "group_read", 100 [TOMOYO_MODE_GROUP_WRITE] = "group_write", 101 [TOMOYO_MODE_GROUP_EXECUTE] = "group_execute", 102 [TOMOYO_MODE_OTHERS_READ] = "others_read", 103 [TOMOYO_MODE_OTHERS_WRITE] = "others_write", 104 [TOMOYO_MODE_OTHERS_EXECUTE] = "others_execute", 105 [TOMOYO_EXEC_REALPATH] = "exec.realpath", 106 [TOMOYO_SYMLINK_TARGET] = "symlink.target", 107 [TOMOYO_PATH1_UID] = "path1.uid", 108 [TOMOYO_PATH1_GID] = "path1.gid", 109 [TOMOYO_PATH1_INO] = "path1.ino", 110 [TOMOYO_PATH1_MAJOR] = "path1.major", 111 [TOMOYO_PATH1_MINOR] = "path1.minor", 112 [TOMOYO_PATH1_PERM] = "path1.perm", 113 [TOMOYO_PATH1_TYPE] = "path1.type", 114 [TOMOYO_PATH1_DEV_MAJOR] = "path1.dev_major", 115 [TOMOYO_PATH1_DEV_MINOR] = "path1.dev_minor", 116 [TOMOYO_PATH2_UID] = "path2.uid", 117 [TOMOYO_PATH2_GID] = "path2.gid", 118 [TOMOYO_PATH2_INO] = "path2.ino", 119 [TOMOYO_PATH2_MAJOR] = "path2.major", 120 [TOMOYO_PATH2_MINOR] = "path2.minor", 121 [TOMOYO_PATH2_PERM] = "path2.perm", 122 [TOMOYO_PATH2_TYPE] = "path2.type", 123 [TOMOYO_PATH2_DEV_MAJOR] = "path2.dev_major", 124 [TOMOYO_PATH2_DEV_MINOR] = "path2.dev_minor", 125 [TOMOYO_PATH1_PARENT_UID] = "path1.parent.uid", 126 [TOMOYO_PATH1_PARENT_GID] = "path1.parent.gid", 127 [TOMOYO_PATH1_PARENT_INO] = "path1.parent.ino", 128 [TOMOYO_PATH1_PARENT_PERM] = "path1.parent.perm", 129 [TOMOYO_PATH2_PARENT_UID] = "path2.parent.uid", 130 [TOMOYO_PATH2_PARENT_GID] = "path2.parent.gid", 131 [TOMOYO_PATH2_PARENT_INO] = "path2.parent.ino", 132 [TOMOYO_PATH2_PARENT_PERM] = "path2.parent.perm", 133 }; 134 135 /* String table for PREFERENCE keyword. */ 136 static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = { 137 [TOMOYO_PREF_MAX_AUDIT_LOG] = "max_audit_log", 138 [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry", 139 }; 140 141 /* String table for path operation. */ 142 const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = { 143 [TOMOYO_TYPE_EXECUTE] = "execute", 144 [TOMOYO_TYPE_READ] = "read", 145 [TOMOYO_TYPE_WRITE] = "write", 146 [TOMOYO_TYPE_APPEND] = "append", 147 [TOMOYO_TYPE_UNLINK] = "unlink", 148 [TOMOYO_TYPE_GETATTR] = "getattr", 149 [TOMOYO_TYPE_RMDIR] = "rmdir", 150 [TOMOYO_TYPE_TRUNCATE] = "truncate", 151 [TOMOYO_TYPE_SYMLINK] = "symlink", 152 [TOMOYO_TYPE_CHROOT] = "chroot", 153 [TOMOYO_TYPE_UMOUNT] = "unmount", 154 }; 155 156 /* String table for socket's operation. */ 157 const char * const tomoyo_socket_keyword[TOMOYO_MAX_NETWORK_OPERATION] = { 158 [TOMOYO_NETWORK_BIND] = "bind", 159 [TOMOYO_NETWORK_LISTEN] = "listen", 160 [TOMOYO_NETWORK_CONNECT] = "connect", 161 [TOMOYO_NETWORK_SEND] = "send", 162 }; 163 164 /* String table for categories. */ 165 static const char * const tomoyo_category_keywords 166 [TOMOYO_MAX_MAC_CATEGORY_INDEX] = { 167 [TOMOYO_MAC_CATEGORY_FILE] = "file", 168 [TOMOYO_MAC_CATEGORY_NETWORK] = "network", 169 [TOMOYO_MAC_CATEGORY_MISC] = "misc", 170 }; 171 172 /* Permit policy management by non-root user? */ 173 static bool tomoyo_manage_by_non_root; 174 175 /* Utility functions. */ 176 177 /** 178 * tomoyo_yesno - Return "yes" or "no". 179 * 180 * @value: Bool value. 181 */ 182 const char *tomoyo_yesno(const unsigned int value) 183 { 184 return value ? "yes" : "no"; 185 } 186 187 /** 188 * tomoyo_addprintf - strncat()-like-snprintf(). 189 * 190 * @buffer: Buffer to write to. Must be '\0'-terminated. 191 * @len: Size of @buffer. 192 * @fmt: The printf()'s format string, followed by parameters. 193 * 194 * Returns nothing. 195 */ 196 static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...) 197 { 198 va_list args; 199 const int pos = strlen(buffer); 200 va_start(args, fmt); 201 vsnprintf(buffer + pos, len - pos - 1, fmt, args); 202 va_end(args); 203 } 204 205 /** 206 * tomoyo_flush - Flush queued string to userspace's buffer. 207 * 208 * @head: Pointer to "struct tomoyo_io_buffer". 209 * 210 * Returns true if all data was flushed, false otherwise. 211 */ 212 static bool tomoyo_flush(struct tomoyo_io_buffer *head) 213 { 214 while (head->r.w_pos) { 215 const char *w = head->r.w[0]; 216 size_t len = strlen(w); 217 if (len) { 218 if (len > head->read_user_buf_avail) 219 len = head->read_user_buf_avail; 220 if (!len) 221 return false; 222 if (copy_to_user(head->read_user_buf, w, len)) 223 return false; 224 head->read_user_buf_avail -= len; 225 head->read_user_buf += len; 226 w += len; 227 } 228 head->r.w[0] = w; 229 if (*w) 230 return false; 231 /* Add '\0' for audit logs and query. */ 232 if (head->poll) { 233 if (!head->read_user_buf_avail || 234 copy_to_user(head->read_user_buf, "", 1)) 235 return false; 236 head->read_user_buf_avail--; 237 head->read_user_buf++; 238 } 239 head->r.w_pos--; 240 for (len = 0; len < head->r.w_pos; len++) 241 head->r.w[len] = head->r.w[len + 1]; 242 } 243 head->r.avail = 0; 244 return true; 245 } 246 247 /** 248 * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure. 249 * 250 * @head: Pointer to "struct tomoyo_io_buffer". 251 * @string: String to print. 252 * 253 * Note that @string has to be kept valid until @head is kfree()d. 254 * This means that char[] allocated on stack memory cannot be passed to 255 * this function. Use tomoyo_io_printf() for char[] allocated on stack memory. 256 */ 257 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string) 258 { 259 if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) { 260 head->r.w[head->r.w_pos++] = string; 261 tomoyo_flush(head); 262 } else 263 WARN_ON(1); 264 } 265 266 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, 267 ...) __printf(2, 3); 268 269 /** 270 * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure. 271 * 272 * @head: Pointer to "struct tomoyo_io_buffer". 273 * @fmt: The printf()'s format string, followed by parameters. 274 */ 275 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, 276 ...) 277 { 278 va_list args; 279 size_t len; 280 size_t pos = head->r.avail; 281 int size = head->readbuf_size - pos; 282 if (size <= 0) 283 return; 284 va_start(args, fmt); 285 len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1; 286 va_end(args); 287 if (pos + len >= head->readbuf_size) { 288 WARN_ON(1); 289 return; 290 } 291 head->r.avail += len; 292 tomoyo_set_string(head, head->read_buf + pos); 293 } 294 295 /** 296 * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure. 297 * 298 * @head: Pointer to "struct tomoyo_io_buffer". 299 * 300 * Returns nothing. 301 */ 302 static void tomoyo_set_space(struct tomoyo_io_buffer *head) 303 { 304 tomoyo_set_string(head, " "); 305 } 306 307 /** 308 * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure. 309 * 310 * @head: Pointer to "struct tomoyo_io_buffer". 311 * 312 * Returns nothing. 313 */ 314 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head) 315 { 316 tomoyo_set_string(head, "\n"); 317 return !head->r.w_pos; 318 } 319 320 /** 321 * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure. 322 * 323 * @head: Pointer to "struct tomoyo_io_buffer". 324 * 325 * Returns nothing. 326 */ 327 static void tomoyo_set_slash(struct tomoyo_io_buffer *head) 328 { 329 tomoyo_set_string(head, "/"); 330 } 331 332 /* List of namespaces. */ 333 LIST_HEAD(tomoyo_namespace_list); 334 /* True if namespace other than tomoyo_kernel_namespace is defined. */ 335 static bool tomoyo_namespace_enabled; 336 337 /** 338 * tomoyo_init_policy_namespace - Initialize namespace. 339 * 340 * @ns: Pointer to "struct tomoyo_policy_namespace". 341 * 342 * Returns nothing. 343 */ 344 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns) 345 { 346 unsigned int idx; 347 for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++) 348 INIT_LIST_HEAD(&ns->acl_group[idx]); 349 for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++) 350 INIT_LIST_HEAD(&ns->group_list[idx]); 351 for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++) 352 INIT_LIST_HEAD(&ns->policy_list[idx]); 353 ns->profile_version = 20110903; 354 tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list); 355 list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list); 356 } 357 358 /** 359 * tomoyo_print_namespace - Print namespace header. 360 * 361 * @head: Pointer to "struct tomoyo_io_buffer". 362 * 363 * Returns nothing. 364 */ 365 static void tomoyo_print_namespace(struct tomoyo_io_buffer *head) 366 { 367 if (!tomoyo_namespace_enabled) 368 return; 369 tomoyo_set_string(head, 370 container_of(head->r.ns, 371 struct tomoyo_policy_namespace, 372 namespace_list)->name); 373 tomoyo_set_space(head); 374 } 375 376 /** 377 * tomoyo_print_name_union - Print a tomoyo_name_union. 378 * 379 * @head: Pointer to "struct tomoyo_io_buffer". 380 * @ptr: Pointer to "struct tomoyo_name_union". 381 */ 382 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head, 383 const struct tomoyo_name_union *ptr) 384 { 385 tomoyo_set_space(head); 386 if (ptr->group) { 387 tomoyo_set_string(head, "@"); 388 tomoyo_set_string(head, ptr->group->group_name->name); 389 } else { 390 tomoyo_set_string(head, ptr->filename->name); 391 } 392 } 393 394 /** 395 * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote. 396 * 397 * @head: Pointer to "struct tomoyo_io_buffer". 398 * @ptr: Pointer to "struct tomoyo_name_union". 399 * 400 * Returns nothing. 401 */ 402 static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head, 403 const struct tomoyo_name_union *ptr) 404 { 405 if (ptr->group) { 406 tomoyo_set_string(head, "@"); 407 tomoyo_set_string(head, ptr->group->group_name->name); 408 } else { 409 tomoyo_set_string(head, "\""); 410 tomoyo_set_string(head, ptr->filename->name); 411 tomoyo_set_string(head, "\""); 412 } 413 } 414 415 /** 416 * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space. 417 * 418 * @head: Pointer to "struct tomoyo_io_buffer". 419 * @ptr: Pointer to "struct tomoyo_number_union". 420 * 421 * Returns nothing. 422 */ 423 static void tomoyo_print_number_union_nospace 424 (struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr) 425 { 426 if (ptr->group) { 427 tomoyo_set_string(head, "@"); 428 tomoyo_set_string(head, ptr->group->group_name->name); 429 } else { 430 int i; 431 unsigned long min = ptr->values[0]; 432 const unsigned long max = ptr->values[1]; 433 u8 min_type = ptr->value_type[0]; 434 const u8 max_type = ptr->value_type[1]; 435 char buffer[128]; 436 buffer[0] = '\0'; 437 for (i = 0; i < 2; i++) { 438 switch (min_type) { 439 case TOMOYO_VALUE_TYPE_HEXADECIMAL: 440 tomoyo_addprintf(buffer, sizeof(buffer), 441 "0x%lX", min); 442 break; 443 case TOMOYO_VALUE_TYPE_OCTAL: 444 tomoyo_addprintf(buffer, sizeof(buffer), 445 "0%lo", min); 446 break; 447 default: 448 tomoyo_addprintf(buffer, sizeof(buffer), "%lu", 449 min); 450 break; 451 } 452 if (min == max && min_type == max_type) 453 break; 454 tomoyo_addprintf(buffer, sizeof(buffer), "-"); 455 min_type = max_type; 456 min = max; 457 } 458 tomoyo_io_printf(head, "%s", buffer); 459 } 460 } 461 462 /** 463 * tomoyo_print_number_union - Print a tomoyo_number_union. 464 * 465 * @head: Pointer to "struct tomoyo_io_buffer". 466 * @ptr: Pointer to "struct tomoyo_number_union". 467 * 468 * Returns nothing. 469 */ 470 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head, 471 const struct tomoyo_number_union *ptr) 472 { 473 tomoyo_set_space(head); 474 tomoyo_print_number_union_nospace(head, ptr); 475 } 476 477 /** 478 * tomoyo_assign_profile - Create a new profile. 479 * 480 * @ns: Pointer to "struct tomoyo_policy_namespace". 481 * @profile: Profile number to create. 482 * 483 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise. 484 */ 485 static struct tomoyo_profile *tomoyo_assign_profile 486 (struct tomoyo_policy_namespace *ns, const unsigned int profile) 487 { 488 struct tomoyo_profile *ptr; 489 struct tomoyo_profile *entry; 490 if (profile >= TOMOYO_MAX_PROFILES) 491 return NULL; 492 ptr = ns->profile_ptr[profile]; 493 if (ptr) 494 return ptr; 495 entry = kzalloc(sizeof(*entry), GFP_NOFS); 496 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 497 goto out; 498 ptr = ns->profile_ptr[profile]; 499 if (!ptr && tomoyo_memory_ok(entry)) { 500 ptr = entry; 501 ptr->default_config = TOMOYO_CONFIG_DISABLED | 502 TOMOYO_CONFIG_WANT_GRANT_LOG | 503 TOMOYO_CONFIG_WANT_REJECT_LOG; 504 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT, 505 sizeof(ptr->config)); 506 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] = 507 CONFIG_SECURITY_TOMOYO_MAX_AUDIT_LOG; 508 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] = 509 CONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY; 510 mb(); /* Avoid out-of-order execution. */ 511 ns->profile_ptr[profile] = ptr; 512 entry = NULL; 513 } 514 mutex_unlock(&tomoyo_policy_lock); 515 out: 516 kfree(entry); 517 return ptr; 518 } 519 520 /** 521 * tomoyo_profile - Find a profile. 522 * 523 * @ns: Pointer to "struct tomoyo_policy_namespace". 524 * @profile: Profile number to find. 525 * 526 * Returns pointer to "struct tomoyo_profile". 527 */ 528 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns, 529 const u8 profile) 530 { 531 static struct tomoyo_profile tomoyo_null_profile; 532 struct tomoyo_profile *ptr = ns->profile_ptr[profile]; 533 if (!ptr) 534 ptr = &tomoyo_null_profile; 535 return ptr; 536 } 537 538 /** 539 * tomoyo_find_yesno - Find values for specified keyword. 540 * 541 * @string: String to check. 542 * @find: Name of keyword. 543 * 544 * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise. 545 */ 546 static s8 tomoyo_find_yesno(const char *string, const char *find) 547 { 548 const char *cp = strstr(string, find); 549 if (cp) { 550 cp += strlen(find); 551 if (!strncmp(cp, "=yes", 4)) 552 return 1; 553 else if (!strncmp(cp, "=no", 3)) 554 return 0; 555 } 556 return -1; 557 } 558 559 /** 560 * tomoyo_set_uint - Set value for specified preference. 561 * 562 * @i: Pointer to "unsigned int". 563 * @string: String to check. 564 * @find: Name of keyword. 565 * 566 * Returns nothing. 567 */ 568 static void tomoyo_set_uint(unsigned int *i, const char *string, 569 const char *find) 570 { 571 const char *cp = strstr(string, find); 572 if (cp) 573 sscanf(cp + strlen(find), "=%u", i); 574 } 575 576 /** 577 * tomoyo_set_mode - Set mode for specified profile. 578 * 579 * @name: Name of functionality. 580 * @value: Mode for @name. 581 * @profile: Pointer to "struct tomoyo_profile". 582 * 583 * Returns 0 on success, negative value otherwise. 584 */ 585 static int tomoyo_set_mode(char *name, const char *value, 586 struct tomoyo_profile *profile) 587 { 588 u8 i; 589 u8 config; 590 if (!strcmp(name, "CONFIG")) { 591 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX; 592 config = profile->default_config; 593 } else if (tomoyo_str_starts(&name, "CONFIG::")) { 594 config = 0; 595 for (i = 0; i < TOMOYO_MAX_MAC_INDEX 596 + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) { 597 int len = 0; 598 if (i < TOMOYO_MAX_MAC_INDEX) { 599 const u8 c = tomoyo_index2category[i]; 600 const char *category = 601 tomoyo_category_keywords[c]; 602 len = strlen(category); 603 if (strncmp(name, category, len) || 604 name[len++] != ':' || name[len++] != ':') 605 continue; 606 } 607 if (strcmp(name + len, tomoyo_mac_keywords[i])) 608 continue; 609 config = profile->config[i]; 610 break; 611 } 612 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX) 613 return -EINVAL; 614 } else { 615 return -EINVAL; 616 } 617 if (strstr(value, "use_default")) { 618 config = TOMOYO_CONFIG_USE_DEFAULT; 619 } else { 620 u8 mode; 621 for (mode = 0; mode < 4; mode++) 622 if (strstr(value, tomoyo_mode[mode])) 623 /* 624 * Update lower 3 bits in order to distinguish 625 * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'. 626 */ 627 config = (config & ~7) | mode; 628 if (config != TOMOYO_CONFIG_USE_DEFAULT) { 629 switch (tomoyo_find_yesno(value, "grant_log")) { 630 case 1: 631 config |= TOMOYO_CONFIG_WANT_GRANT_LOG; 632 break; 633 case 0: 634 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG; 635 break; 636 } 637 switch (tomoyo_find_yesno(value, "reject_log")) { 638 case 1: 639 config |= TOMOYO_CONFIG_WANT_REJECT_LOG; 640 break; 641 case 0: 642 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG; 643 break; 644 } 645 } 646 } 647 if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX) 648 profile->config[i] = config; 649 else if (config != TOMOYO_CONFIG_USE_DEFAULT) 650 profile->default_config = config; 651 return 0; 652 } 653 654 /** 655 * tomoyo_write_profile - Write profile table. 656 * 657 * @head: Pointer to "struct tomoyo_io_buffer". 658 * 659 * Returns 0 on success, negative value otherwise. 660 */ 661 static int tomoyo_write_profile(struct tomoyo_io_buffer *head) 662 { 663 char *data = head->write_buf; 664 unsigned int i; 665 char *cp; 666 struct tomoyo_profile *profile; 667 if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version) 668 == 1) 669 return 0; 670 i = simple_strtoul(data, &cp, 10); 671 if (*cp != '-') 672 return -EINVAL; 673 data = cp + 1; 674 profile = tomoyo_assign_profile(head->w.ns, i); 675 if (!profile) 676 return -EINVAL; 677 cp = strchr(data, '='); 678 if (!cp) 679 return -EINVAL; 680 *cp++ = '\0'; 681 if (!strcmp(data, "COMMENT")) { 682 static DEFINE_SPINLOCK(lock); 683 const struct tomoyo_path_info *new_comment 684 = tomoyo_get_name(cp); 685 const struct tomoyo_path_info *old_comment; 686 if (!new_comment) 687 return -ENOMEM; 688 spin_lock(&lock); 689 old_comment = profile->comment; 690 profile->comment = new_comment; 691 spin_unlock(&lock); 692 tomoyo_put_name(old_comment); 693 return 0; 694 } 695 if (!strcmp(data, "PREFERENCE")) { 696 for (i = 0; i < TOMOYO_MAX_PREF; i++) 697 tomoyo_set_uint(&profile->pref[i], cp, 698 tomoyo_pref_keywords[i]); 699 return 0; 700 } 701 return tomoyo_set_mode(data, cp, profile); 702 } 703 704 /** 705 * tomoyo_print_config - Print mode for specified functionality. 706 * 707 * @head: Pointer to "struct tomoyo_io_buffer". 708 * @config: Mode for that functionality. 709 * 710 * Returns nothing. 711 * 712 * Caller prints functionality's name. 713 */ 714 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config) 715 { 716 tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n", 717 tomoyo_mode[config & 3], 718 tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG), 719 tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG)); 720 } 721 722 /** 723 * tomoyo_read_profile - Read profile table. 724 * 725 * @head: Pointer to "struct tomoyo_io_buffer". 726 * 727 * Returns nothing. 728 */ 729 static void tomoyo_read_profile(struct tomoyo_io_buffer *head) 730 { 731 u8 index; 732 struct tomoyo_policy_namespace *ns = 733 container_of(head->r.ns, typeof(*ns), namespace_list); 734 const struct tomoyo_profile *profile; 735 if (head->r.eof) 736 return; 737 next: 738 index = head->r.index; 739 profile = ns->profile_ptr[index]; 740 switch (head->r.step) { 741 case 0: 742 tomoyo_print_namespace(head); 743 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n", 744 ns->profile_version); 745 head->r.step++; 746 break; 747 case 1: 748 for ( ; head->r.index < TOMOYO_MAX_PROFILES; 749 head->r.index++) 750 if (ns->profile_ptr[head->r.index]) 751 break; 752 if (head->r.index == TOMOYO_MAX_PROFILES) { 753 head->r.eof = true; 754 return; 755 } 756 head->r.step++; 757 break; 758 case 2: 759 { 760 u8 i; 761 const struct tomoyo_path_info *comment = 762 profile->comment; 763 tomoyo_print_namespace(head); 764 tomoyo_io_printf(head, "%u-COMMENT=", index); 765 tomoyo_set_string(head, comment ? comment->name : ""); 766 tomoyo_set_lf(head); 767 tomoyo_print_namespace(head); 768 tomoyo_io_printf(head, "%u-PREFERENCE={ ", index); 769 for (i = 0; i < TOMOYO_MAX_PREF; i++) 770 tomoyo_io_printf(head, "%s=%u ", 771 tomoyo_pref_keywords[i], 772 profile->pref[i]); 773 tomoyo_set_string(head, "}\n"); 774 head->r.step++; 775 } 776 break; 777 case 3: 778 { 779 tomoyo_print_namespace(head); 780 tomoyo_io_printf(head, "%u-%s", index, "CONFIG"); 781 tomoyo_print_config(head, profile->default_config); 782 head->r.bit = 0; 783 head->r.step++; 784 } 785 break; 786 case 4: 787 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX 788 + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) { 789 const u8 i = head->r.bit; 790 const u8 config = profile->config[i]; 791 if (config == TOMOYO_CONFIG_USE_DEFAULT) 792 continue; 793 tomoyo_print_namespace(head); 794 if (i < TOMOYO_MAX_MAC_INDEX) 795 tomoyo_io_printf(head, "%u-CONFIG::%s::%s", 796 index, 797 tomoyo_category_keywords 798 [tomoyo_index2category[i]], 799 tomoyo_mac_keywords[i]); 800 else 801 tomoyo_io_printf(head, "%u-CONFIG::%s", index, 802 tomoyo_mac_keywords[i]); 803 tomoyo_print_config(head, config); 804 head->r.bit++; 805 break; 806 } 807 if (head->r.bit == TOMOYO_MAX_MAC_INDEX 808 + TOMOYO_MAX_MAC_CATEGORY_INDEX) { 809 head->r.index++; 810 head->r.step = 1; 811 } 812 break; 813 } 814 if (tomoyo_flush(head)) 815 goto next; 816 } 817 818 /** 819 * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry. 820 * 821 * @a: Pointer to "struct tomoyo_acl_head". 822 * @b: Pointer to "struct tomoyo_acl_head". 823 * 824 * Returns true if @a == @b, false otherwise. 825 */ 826 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a, 827 const struct tomoyo_acl_head *b) 828 { 829 return container_of(a, struct tomoyo_manager, head)->manager == 830 container_of(b, struct tomoyo_manager, head)->manager; 831 } 832 833 /** 834 * tomoyo_update_manager_entry - Add a manager entry. 835 * 836 * @manager: The path to manager or the domainnamme. 837 * @is_delete: True if it is a delete request. 838 * 839 * Returns 0 on success, negative value otherwise. 840 * 841 * Caller holds tomoyo_read_lock(). 842 */ 843 static int tomoyo_update_manager_entry(const char *manager, 844 const bool is_delete) 845 { 846 struct tomoyo_manager e = { }; 847 struct tomoyo_acl_param param = { 848 /* .ns = &tomoyo_kernel_namespace, */ 849 .is_delete = is_delete, 850 .list = &tomoyo_kernel_namespace. 851 policy_list[TOMOYO_ID_MANAGER], 852 }; 853 int error = is_delete ? -ENOENT : -ENOMEM; 854 if (!tomoyo_correct_domain(manager) && 855 !tomoyo_correct_word(manager)) 856 return -EINVAL; 857 e.manager = tomoyo_get_name(manager); 858 if (e.manager) { 859 error = tomoyo_update_policy(&e.head, sizeof(e), ¶m, 860 tomoyo_same_manager); 861 tomoyo_put_name(e.manager); 862 } 863 return error; 864 } 865 866 /** 867 * tomoyo_write_manager - Write manager policy. 868 * 869 * @head: Pointer to "struct tomoyo_io_buffer". 870 * 871 * Returns 0 on success, negative value otherwise. 872 * 873 * Caller holds tomoyo_read_lock(). 874 */ 875 static int tomoyo_write_manager(struct tomoyo_io_buffer *head) 876 { 877 char *data = head->write_buf; 878 879 if (!strcmp(data, "manage_by_non_root")) { 880 tomoyo_manage_by_non_root = !head->w.is_delete; 881 return 0; 882 } 883 return tomoyo_update_manager_entry(data, head->w.is_delete); 884 } 885 886 /** 887 * tomoyo_read_manager - Read manager policy. 888 * 889 * @head: Pointer to "struct tomoyo_io_buffer". 890 * 891 * Caller holds tomoyo_read_lock(). 892 */ 893 static void tomoyo_read_manager(struct tomoyo_io_buffer *head) 894 { 895 if (head->r.eof) 896 return; 897 list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace. 898 policy_list[TOMOYO_ID_MANAGER]) { 899 struct tomoyo_manager *ptr = 900 list_entry(head->r.acl, typeof(*ptr), head.list); 901 if (ptr->head.is_deleted) 902 continue; 903 if (!tomoyo_flush(head)) 904 return; 905 tomoyo_set_string(head, ptr->manager->name); 906 tomoyo_set_lf(head); 907 } 908 head->r.eof = true; 909 } 910 911 /** 912 * tomoyo_manager - Check whether the current process is a policy manager. 913 * 914 * Returns true if the current process is permitted to modify policy 915 * via /sys/kernel/security/tomoyo/ interface. 916 * 917 * Caller holds tomoyo_read_lock(). 918 */ 919 static bool tomoyo_manager(void) 920 { 921 struct tomoyo_manager *ptr; 922 const char *exe; 923 const struct task_struct *task = current; 924 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname; 925 bool found = false; 926 927 if (!tomoyo_policy_loaded) 928 return true; 929 if (!tomoyo_manage_by_non_root && 930 (!uid_eq(task->cred->uid, GLOBAL_ROOT_UID) || 931 !uid_eq(task->cred->euid, GLOBAL_ROOT_UID))) 932 return false; 933 exe = tomoyo_get_exe(); 934 if (!exe) 935 return false; 936 list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace. 937 policy_list[TOMOYO_ID_MANAGER], head.list) { 938 if (!ptr->head.is_deleted && 939 (!tomoyo_pathcmp(domainname, ptr->manager) || 940 !strcmp(exe, ptr->manager->name))) { 941 found = true; 942 break; 943 } 944 } 945 if (!found) { /* Reduce error messages. */ 946 static pid_t last_pid; 947 const pid_t pid = current->pid; 948 if (last_pid != pid) { 949 printk(KERN_WARNING "%s ( %s ) is not permitted to " 950 "update policies.\n", domainname->name, exe); 951 last_pid = pid; 952 } 953 } 954 kfree(exe); 955 return found; 956 } 957 958 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid 959 (unsigned int serial); 960 961 /** 962 * tomoyo_select_domain - Parse select command. 963 * 964 * @head: Pointer to "struct tomoyo_io_buffer". 965 * @data: String to parse. 966 * 967 * Returns true on success, false otherwise. 968 * 969 * Caller holds tomoyo_read_lock(). 970 */ 971 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head, 972 const char *data) 973 { 974 unsigned int pid; 975 struct tomoyo_domain_info *domain = NULL; 976 bool global_pid = false; 977 if (strncmp(data, "select ", 7)) 978 return false; 979 data += 7; 980 if (sscanf(data, "pid=%u", &pid) == 1 || 981 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { 982 struct task_struct *p; 983 rcu_read_lock(); 984 if (global_pid) 985 p = find_task_by_pid_ns(pid, &init_pid_ns); 986 else 987 p = find_task_by_vpid(pid); 988 if (p) 989 domain = tomoyo_real_domain(p); 990 rcu_read_unlock(); 991 } else if (!strncmp(data, "domain=", 7)) { 992 if (tomoyo_domain_def(data + 7)) 993 domain = tomoyo_find_domain(data + 7); 994 } else if (sscanf(data, "Q=%u", &pid) == 1) { 995 domain = tomoyo_find_domain_by_qid(pid); 996 } else 997 return false; 998 head->w.domain = domain; 999 /* Accessing read_buf is safe because head->io_sem is held. */ 1000 if (!head->read_buf) 1001 return true; /* Do nothing if open(O_WRONLY). */ 1002 memset(&head->r, 0, sizeof(head->r)); 1003 head->r.print_this_domain_only = true; 1004 if (domain) 1005 head->r.domain = &domain->list; 1006 else 1007 head->r.eof = 1; 1008 tomoyo_io_printf(head, "# select %s\n", data); 1009 if (domain && domain->is_deleted) 1010 tomoyo_io_printf(head, "# This is a deleted domain.\n"); 1011 return true; 1012 } 1013 1014 /** 1015 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry. 1016 * 1017 * @a: Pointer to "struct tomoyo_acl_info". 1018 * @b: Pointer to "struct tomoyo_acl_info". 1019 * 1020 * Returns true if @a == @b, false otherwise. 1021 */ 1022 static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a, 1023 const struct tomoyo_acl_info *b) 1024 { 1025 const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head); 1026 const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head); 1027 return p1->domainname == p2->domainname; 1028 } 1029 1030 /** 1031 * tomoyo_write_task - Update task related list. 1032 * 1033 * @param: Pointer to "struct tomoyo_acl_param". 1034 * 1035 * Returns 0 on success, negative value otherwise. 1036 * 1037 * Caller holds tomoyo_read_lock(). 1038 */ 1039 static int tomoyo_write_task(struct tomoyo_acl_param *param) 1040 { 1041 int error = -EINVAL; 1042 if (tomoyo_str_starts(¶m->data, "manual_domain_transition ")) { 1043 struct tomoyo_task_acl e = { 1044 .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL, 1045 .domainname = tomoyo_get_domainname(param), 1046 }; 1047 if (e.domainname) 1048 error = tomoyo_update_domain(&e.head, sizeof(e), param, 1049 tomoyo_same_task_acl, 1050 NULL); 1051 tomoyo_put_name(e.domainname); 1052 } 1053 return error; 1054 } 1055 1056 /** 1057 * tomoyo_delete_domain - Delete a domain. 1058 * 1059 * @domainname: The name of domain. 1060 * 1061 * Returns 0 on success, negative value otherwise. 1062 * 1063 * Caller holds tomoyo_read_lock(). 1064 */ 1065 static int tomoyo_delete_domain(char *domainname) 1066 { 1067 struct tomoyo_domain_info *domain; 1068 struct tomoyo_path_info name; 1069 1070 name.name = domainname; 1071 tomoyo_fill_path_info(&name); 1072 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 1073 return -EINTR; 1074 /* Is there an active domain? */ 1075 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 1076 /* Never delete tomoyo_kernel_domain */ 1077 if (domain == &tomoyo_kernel_domain) 1078 continue; 1079 if (domain->is_deleted || 1080 tomoyo_pathcmp(domain->domainname, &name)) 1081 continue; 1082 domain->is_deleted = true; 1083 break; 1084 } 1085 mutex_unlock(&tomoyo_policy_lock); 1086 return 0; 1087 } 1088 1089 /** 1090 * tomoyo_write_domain2 - Write domain policy. 1091 * 1092 * @ns: Pointer to "struct tomoyo_policy_namespace". 1093 * @list: Pointer to "struct list_head". 1094 * @data: Policy to be interpreted. 1095 * @is_delete: True if it is a delete request. 1096 * 1097 * Returns 0 on success, negative value otherwise. 1098 * 1099 * Caller holds tomoyo_read_lock(). 1100 */ 1101 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns, 1102 struct list_head *list, char *data, 1103 const bool is_delete) 1104 { 1105 struct tomoyo_acl_param param = { 1106 .ns = ns, 1107 .list = list, 1108 .data = data, 1109 .is_delete = is_delete, 1110 }; 1111 static const struct { 1112 const char *keyword; 1113 int (*write) (struct tomoyo_acl_param *); 1114 } tomoyo_callback[5] = { 1115 { "file ", tomoyo_write_file }, 1116 { "network inet ", tomoyo_write_inet_network }, 1117 { "network unix ", tomoyo_write_unix_network }, 1118 { "misc ", tomoyo_write_misc }, 1119 { "task ", tomoyo_write_task }, 1120 }; 1121 u8 i; 1122 1123 for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) { 1124 if (!tomoyo_str_starts(¶m.data, 1125 tomoyo_callback[i].keyword)) 1126 continue; 1127 return tomoyo_callback[i].write(¶m); 1128 } 1129 return -EINVAL; 1130 } 1131 1132 /* String table for domain flags. */ 1133 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = { 1134 [TOMOYO_DIF_QUOTA_WARNED] = "quota_exceeded\n", 1135 [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n", 1136 }; 1137 1138 /** 1139 * tomoyo_write_domain - Write domain policy. 1140 * 1141 * @head: Pointer to "struct tomoyo_io_buffer". 1142 * 1143 * Returns 0 on success, negative value otherwise. 1144 * 1145 * Caller holds tomoyo_read_lock(). 1146 */ 1147 static int tomoyo_write_domain(struct tomoyo_io_buffer *head) 1148 { 1149 char *data = head->write_buf; 1150 struct tomoyo_policy_namespace *ns; 1151 struct tomoyo_domain_info *domain = head->w.domain; 1152 const bool is_delete = head->w.is_delete; 1153 bool is_select = !is_delete && tomoyo_str_starts(&data, "select "); 1154 unsigned int profile; 1155 if (*data == '<') { 1156 int ret = 0; 1157 domain = NULL; 1158 if (is_delete) 1159 ret = tomoyo_delete_domain(data); 1160 else if (is_select) 1161 domain = tomoyo_find_domain(data); 1162 else 1163 domain = tomoyo_assign_domain(data, false); 1164 head->w.domain = domain; 1165 return ret; 1166 } 1167 if (!domain) 1168 return -EINVAL; 1169 ns = domain->ns; 1170 if (sscanf(data, "use_profile %u", &profile) == 1 1171 && profile < TOMOYO_MAX_PROFILES) { 1172 if (!tomoyo_policy_loaded || ns->profile_ptr[profile]) 1173 domain->profile = (u8) profile; 1174 return 0; 1175 } 1176 if (sscanf(data, "use_group %u\n", &profile) == 1 1177 && profile < TOMOYO_MAX_ACL_GROUPS) { 1178 if (!is_delete) 1179 domain->group = (u8) profile; 1180 return 0; 1181 } 1182 for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) { 1183 const char *cp = tomoyo_dif[profile]; 1184 if (strncmp(data, cp, strlen(cp) - 1)) 1185 continue; 1186 domain->flags[profile] = !is_delete; 1187 return 0; 1188 } 1189 return tomoyo_write_domain2(ns, &domain->acl_info_list, data, 1190 is_delete); 1191 } 1192 1193 /** 1194 * tomoyo_print_condition - Print condition part. 1195 * 1196 * @head: Pointer to "struct tomoyo_io_buffer". 1197 * @cond: Pointer to "struct tomoyo_condition". 1198 * 1199 * Returns true on success, false otherwise. 1200 */ 1201 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head, 1202 const struct tomoyo_condition *cond) 1203 { 1204 switch (head->r.cond_step) { 1205 case 0: 1206 head->r.cond_index = 0; 1207 head->r.cond_step++; 1208 if (cond->transit) { 1209 tomoyo_set_space(head); 1210 tomoyo_set_string(head, cond->transit->name); 1211 } 1212 /* fall through */ 1213 case 1: 1214 { 1215 const u16 condc = cond->condc; 1216 const struct tomoyo_condition_element *condp = 1217 (typeof(condp)) (cond + 1); 1218 const struct tomoyo_number_union *numbers_p = 1219 (typeof(numbers_p)) (condp + condc); 1220 const struct tomoyo_name_union *names_p = 1221 (typeof(names_p)) 1222 (numbers_p + cond->numbers_count); 1223 const struct tomoyo_argv *argv = 1224 (typeof(argv)) (names_p + cond->names_count); 1225 const struct tomoyo_envp *envp = 1226 (typeof(envp)) (argv + cond->argc); 1227 u16 skip; 1228 for (skip = 0; skip < head->r.cond_index; skip++) { 1229 const u8 left = condp->left; 1230 const u8 right = condp->right; 1231 condp++; 1232 switch (left) { 1233 case TOMOYO_ARGV_ENTRY: 1234 argv++; 1235 continue; 1236 case TOMOYO_ENVP_ENTRY: 1237 envp++; 1238 continue; 1239 case TOMOYO_NUMBER_UNION: 1240 numbers_p++; 1241 break; 1242 } 1243 switch (right) { 1244 case TOMOYO_NAME_UNION: 1245 names_p++; 1246 break; 1247 case TOMOYO_NUMBER_UNION: 1248 numbers_p++; 1249 break; 1250 } 1251 } 1252 while (head->r.cond_index < condc) { 1253 const u8 match = condp->equals; 1254 const u8 left = condp->left; 1255 const u8 right = condp->right; 1256 if (!tomoyo_flush(head)) 1257 return false; 1258 condp++; 1259 head->r.cond_index++; 1260 tomoyo_set_space(head); 1261 switch (left) { 1262 case TOMOYO_ARGV_ENTRY: 1263 tomoyo_io_printf(head, 1264 "exec.argv[%lu]%s=\"", 1265 argv->index, argv-> 1266 is_not ? "!" : ""); 1267 tomoyo_set_string(head, 1268 argv->value->name); 1269 tomoyo_set_string(head, "\""); 1270 argv++; 1271 continue; 1272 case TOMOYO_ENVP_ENTRY: 1273 tomoyo_set_string(head, 1274 "exec.envp[\""); 1275 tomoyo_set_string(head, 1276 envp->name->name); 1277 tomoyo_io_printf(head, "\"]%s=", envp-> 1278 is_not ? "!" : ""); 1279 if (envp->value) { 1280 tomoyo_set_string(head, "\""); 1281 tomoyo_set_string(head, envp-> 1282 value->name); 1283 tomoyo_set_string(head, "\""); 1284 } else { 1285 tomoyo_set_string(head, 1286 "NULL"); 1287 } 1288 envp++; 1289 continue; 1290 case TOMOYO_NUMBER_UNION: 1291 tomoyo_print_number_union_nospace 1292 (head, numbers_p++); 1293 break; 1294 default: 1295 tomoyo_set_string(head, 1296 tomoyo_condition_keyword[left]); 1297 break; 1298 } 1299 tomoyo_set_string(head, match ? "=" : "!="); 1300 switch (right) { 1301 case TOMOYO_NAME_UNION: 1302 tomoyo_print_name_union_quoted 1303 (head, names_p++); 1304 break; 1305 case TOMOYO_NUMBER_UNION: 1306 tomoyo_print_number_union_nospace 1307 (head, numbers_p++); 1308 break; 1309 default: 1310 tomoyo_set_string(head, 1311 tomoyo_condition_keyword[right]); 1312 break; 1313 } 1314 } 1315 } 1316 head->r.cond_step++; 1317 /* fall through */ 1318 case 2: 1319 if (!tomoyo_flush(head)) 1320 break; 1321 head->r.cond_step++; 1322 /* fall through */ 1323 case 3: 1324 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO) 1325 tomoyo_io_printf(head, " grant_log=%s", 1326 tomoyo_yesno(cond->grant_log == 1327 TOMOYO_GRANTLOG_YES)); 1328 tomoyo_set_lf(head); 1329 return true; 1330 } 1331 return false; 1332 } 1333 1334 /** 1335 * tomoyo_set_group - Print "acl_group " header keyword and category name. 1336 * 1337 * @head: Pointer to "struct tomoyo_io_buffer". 1338 * @category: Category name. 1339 * 1340 * Returns nothing. 1341 */ 1342 static void tomoyo_set_group(struct tomoyo_io_buffer *head, 1343 const char *category) 1344 { 1345 if (head->type == TOMOYO_EXCEPTIONPOLICY) { 1346 tomoyo_print_namespace(head); 1347 tomoyo_io_printf(head, "acl_group %u ", 1348 head->r.acl_group_index); 1349 } 1350 tomoyo_set_string(head, category); 1351 } 1352 1353 /** 1354 * tomoyo_print_entry - Print an ACL entry. 1355 * 1356 * @head: Pointer to "struct tomoyo_io_buffer". 1357 * @acl: Pointer to an ACL entry. 1358 * 1359 * Returns true on success, false otherwise. 1360 */ 1361 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, 1362 struct tomoyo_acl_info *acl) 1363 { 1364 const u8 acl_type = acl->type; 1365 bool first = true; 1366 u8 bit; 1367 1368 if (head->r.print_cond_part) 1369 goto print_cond_part; 1370 if (acl->is_deleted) 1371 return true; 1372 if (!tomoyo_flush(head)) 1373 return false; 1374 else if (acl_type == TOMOYO_TYPE_PATH_ACL) { 1375 struct tomoyo_path_acl *ptr = 1376 container_of(acl, typeof(*ptr), head); 1377 const u16 perm = ptr->perm; 1378 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { 1379 if (!(perm & (1 << bit))) 1380 continue; 1381 if (head->r.print_transition_related_only && 1382 bit != TOMOYO_TYPE_EXECUTE) 1383 continue; 1384 if (first) { 1385 tomoyo_set_group(head, "file "); 1386 first = false; 1387 } else { 1388 tomoyo_set_slash(head); 1389 } 1390 tomoyo_set_string(head, tomoyo_path_keyword[bit]); 1391 } 1392 if (first) 1393 return true; 1394 tomoyo_print_name_union(head, &ptr->name); 1395 } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) { 1396 struct tomoyo_task_acl *ptr = 1397 container_of(acl, typeof(*ptr), head); 1398 tomoyo_set_group(head, "task "); 1399 tomoyo_set_string(head, "manual_domain_transition "); 1400 tomoyo_set_string(head, ptr->domainname->name); 1401 } else if (head->r.print_transition_related_only) { 1402 return true; 1403 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) { 1404 struct tomoyo_path2_acl *ptr = 1405 container_of(acl, typeof(*ptr), head); 1406 const u8 perm = ptr->perm; 1407 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) { 1408 if (!(perm & (1 << bit))) 1409 continue; 1410 if (first) { 1411 tomoyo_set_group(head, "file "); 1412 first = false; 1413 } else { 1414 tomoyo_set_slash(head); 1415 } 1416 tomoyo_set_string(head, tomoyo_mac_keywords 1417 [tomoyo_pp2mac[bit]]); 1418 } 1419 if (first) 1420 return true; 1421 tomoyo_print_name_union(head, &ptr->name1); 1422 tomoyo_print_name_union(head, &ptr->name2); 1423 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) { 1424 struct tomoyo_path_number_acl *ptr = 1425 container_of(acl, typeof(*ptr), head); 1426 const u8 perm = ptr->perm; 1427 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) { 1428 if (!(perm & (1 << bit))) 1429 continue; 1430 if (first) { 1431 tomoyo_set_group(head, "file "); 1432 first = false; 1433 } else { 1434 tomoyo_set_slash(head); 1435 } 1436 tomoyo_set_string(head, tomoyo_mac_keywords 1437 [tomoyo_pn2mac[bit]]); 1438 } 1439 if (first) 1440 return true; 1441 tomoyo_print_name_union(head, &ptr->name); 1442 tomoyo_print_number_union(head, &ptr->number); 1443 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) { 1444 struct tomoyo_mkdev_acl *ptr = 1445 container_of(acl, typeof(*ptr), head); 1446 const u8 perm = ptr->perm; 1447 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) { 1448 if (!(perm & (1 << bit))) 1449 continue; 1450 if (first) { 1451 tomoyo_set_group(head, "file "); 1452 first = false; 1453 } else { 1454 tomoyo_set_slash(head); 1455 } 1456 tomoyo_set_string(head, tomoyo_mac_keywords 1457 [tomoyo_pnnn2mac[bit]]); 1458 } 1459 if (first) 1460 return true; 1461 tomoyo_print_name_union(head, &ptr->name); 1462 tomoyo_print_number_union(head, &ptr->mode); 1463 tomoyo_print_number_union(head, &ptr->major); 1464 tomoyo_print_number_union(head, &ptr->minor); 1465 } else if (acl_type == TOMOYO_TYPE_INET_ACL) { 1466 struct tomoyo_inet_acl *ptr = 1467 container_of(acl, typeof(*ptr), head); 1468 const u8 perm = ptr->perm; 1469 1470 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) { 1471 if (!(perm & (1 << bit))) 1472 continue; 1473 if (first) { 1474 tomoyo_set_group(head, "network inet "); 1475 tomoyo_set_string(head, tomoyo_proto_keyword 1476 [ptr->protocol]); 1477 tomoyo_set_space(head); 1478 first = false; 1479 } else { 1480 tomoyo_set_slash(head); 1481 } 1482 tomoyo_set_string(head, tomoyo_socket_keyword[bit]); 1483 } 1484 if (first) 1485 return true; 1486 tomoyo_set_space(head); 1487 if (ptr->address.group) { 1488 tomoyo_set_string(head, "@"); 1489 tomoyo_set_string(head, ptr->address.group->group_name 1490 ->name); 1491 } else { 1492 char buf[128]; 1493 tomoyo_print_ip(buf, sizeof(buf), &ptr->address); 1494 tomoyo_io_printf(head, "%s", buf); 1495 } 1496 tomoyo_print_number_union(head, &ptr->port); 1497 } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) { 1498 struct tomoyo_unix_acl *ptr = 1499 container_of(acl, typeof(*ptr), head); 1500 const u8 perm = ptr->perm; 1501 1502 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) { 1503 if (!(perm & (1 << bit))) 1504 continue; 1505 if (first) { 1506 tomoyo_set_group(head, "network unix "); 1507 tomoyo_set_string(head, tomoyo_proto_keyword 1508 [ptr->protocol]); 1509 tomoyo_set_space(head); 1510 first = false; 1511 } else { 1512 tomoyo_set_slash(head); 1513 } 1514 tomoyo_set_string(head, tomoyo_socket_keyword[bit]); 1515 } 1516 if (first) 1517 return true; 1518 tomoyo_print_name_union(head, &ptr->name); 1519 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) { 1520 struct tomoyo_mount_acl *ptr = 1521 container_of(acl, typeof(*ptr), head); 1522 tomoyo_set_group(head, "file mount"); 1523 tomoyo_print_name_union(head, &ptr->dev_name); 1524 tomoyo_print_name_union(head, &ptr->dir_name); 1525 tomoyo_print_name_union(head, &ptr->fs_type); 1526 tomoyo_print_number_union(head, &ptr->flags); 1527 } else if (acl_type == TOMOYO_TYPE_ENV_ACL) { 1528 struct tomoyo_env_acl *ptr = 1529 container_of(acl, typeof(*ptr), head); 1530 1531 tomoyo_set_group(head, "misc env "); 1532 tomoyo_set_string(head, ptr->env->name); 1533 } 1534 if (acl->cond) { 1535 head->r.print_cond_part = true; 1536 head->r.cond_step = 0; 1537 if (!tomoyo_flush(head)) 1538 return false; 1539 print_cond_part: 1540 if (!tomoyo_print_condition(head, acl->cond)) 1541 return false; 1542 head->r.print_cond_part = false; 1543 } else { 1544 tomoyo_set_lf(head); 1545 } 1546 return true; 1547 } 1548 1549 /** 1550 * tomoyo_read_domain2 - Read domain policy. 1551 * 1552 * @head: Pointer to "struct tomoyo_io_buffer". 1553 * @list: Pointer to "struct list_head". 1554 * 1555 * Caller holds tomoyo_read_lock(). 1556 * 1557 * Returns true on success, false otherwise. 1558 */ 1559 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head, 1560 struct list_head *list) 1561 { 1562 list_for_each_cookie(head->r.acl, list) { 1563 struct tomoyo_acl_info *ptr = 1564 list_entry(head->r.acl, typeof(*ptr), list); 1565 if (!tomoyo_print_entry(head, ptr)) 1566 return false; 1567 } 1568 head->r.acl = NULL; 1569 return true; 1570 } 1571 1572 /** 1573 * tomoyo_read_domain - Read domain policy. 1574 * 1575 * @head: Pointer to "struct tomoyo_io_buffer". 1576 * 1577 * Caller holds tomoyo_read_lock(). 1578 */ 1579 static void tomoyo_read_domain(struct tomoyo_io_buffer *head) 1580 { 1581 if (head->r.eof) 1582 return; 1583 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) { 1584 struct tomoyo_domain_info *domain = 1585 list_entry(head->r.domain, typeof(*domain), list); 1586 switch (head->r.step) { 1587 u8 i; 1588 case 0: 1589 if (domain->is_deleted && 1590 !head->r.print_this_domain_only) 1591 continue; 1592 /* Print domainname and flags. */ 1593 tomoyo_set_string(head, domain->domainname->name); 1594 tomoyo_set_lf(head); 1595 tomoyo_io_printf(head, "use_profile %u\n", 1596 domain->profile); 1597 tomoyo_io_printf(head, "use_group %u\n", 1598 domain->group); 1599 for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++) 1600 if (domain->flags[i]) 1601 tomoyo_set_string(head, tomoyo_dif[i]); 1602 head->r.step++; 1603 tomoyo_set_lf(head); 1604 /* fall through */ 1605 case 1: 1606 if (!tomoyo_read_domain2(head, &domain->acl_info_list)) 1607 return; 1608 head->r.step++; 1609 if (!tomoyo_set_lf(head)) 1610 return; 1611 /* fall through */ 1612 case 2: 1613 head->r.step = 0; 1614 if (head->r.print_this_domain_only) 1615 goto done; 1616 } 1617 } 1618 done: 1619 head->r.eof = true; 1620 } 1621 1622 /** 1623 * tomoyo_write_pid: Specify PID to obtain domainname. 1624 * 1625 * @head: Pointer to "struct tomoyo_io_buffer". 1626 * 1627 * Returns 0. 1628 */ 1629 static int tomoyo_write_pid(struct tomoyo_io_buffer *head) 1630 { 1631 head->r.eof = false; 1632 return 0; 1633 } 1634 1635 /** 1636 * tomoyo_read_pid - Get domainname of the specified PID. 1637 * 1638 * @head: Pointer to "struct tomoyo_io_buffer". 1639 * 1640 * Returns the domainname which the specified PID is in on success, 1641 * empty string otherwise. 1642 * The PID is specified by tomoyo_write_pid() so that the user can obtain 1643 * using read()/write() interface rather than sysctl() interface. 1644 */ 1645 static void tomoyo_read_pid(struct tomoyo_io_buffer *head) 1646 { 1647 char *buf = head->write_buf; 1648 bool global_pid = false; 1649 unsigned int pid; 1650 struct task_struct *p; 1651 struct tomoyo_domain_info *domain = NULL; 1652 1653 /* Accessing write_buf is safe because head->io_sem is held. */ 1654 if (!buf) { 1655 head->r.eof = true; 1656 return; /* Do nothing if open(O_RDONLY). */ 1657 } 1658 if (head->r.w_pos || head->r.eof) 1659 return; 1660 head->r.eof = true; 1661 if (tomoyo_str_starts(&buf, "global-pid ")) 1662 global_pid = true; 1663 if (kstrtouint(buf, 10, &pid)) 1664 return; 1665 rcu_read_lock(); 1666 if (global_pid) 1667 p = find_task_by_pid_ns(pid, &init_pid_ns); 1668 else 1669 p = find_task_by_vpid(pid); 1670 if (p) 1671 domain = tomoyo_real_domain(p); 1672 rcu_read_unlock(); 1673 if (!domain) 1674 return; 1675 tomoyo_io_printf(head, "%u %u ", pid, domain->profile); 1676 tomoyo_set_string(head, domain->domainname->name); 1677 } 1678 1679 /* String table for domain transition control keywords. */ 1680 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = { 1681 [TOMOYO_TRANSITION_CONTROL_NO_RESET] = "no_reset_domain ", 1682 [TOMOYO_TRANSITION_CONTROL_RESET] = "reset_domain ", 1683 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ", 1684 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ", 1685 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ", 1686 [TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain ", 1687 }; 1688 1689 /* String table for grouping keywords. */ 1690 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = { 1691 [TOMOYO_PATH_GROUP] = "path_group ", 1692 [TOMOYO_NUMBER_GROUP] = "number_group ", 1693 [TOMOYO_ADDRESS_GROUP] = "address_group ", 1694 }; 1695 1696 /** 1697 * tomoyo_write_exception - Write exception policy. 1698 * 1699 * @head: Pointer to "struct tomoyo_io_buffer". 1700 * 1701 * Returns 0 on success, negative value otherwise. 1702 * 1703 * Caller holds tomoyo_read_lock(). 1704 */ 1705 static int tomoyo_write_exception(struct tomoyo_io_buffer *head) 1706 { 1707 const bool is_delete = head->w.is_delete; 1708 struct tomoyo_acl_param param = { 1709 .ns = head->w.ns, 1710 .is_delete = is_delete, 1711 .data = head->write_buf, 1712 }; 1713 u8 i; 1714 if (tomoyo_str_starts(¶m.data, "aggregator ")) 1715 return tomoyo_write_aggregator(¶m); 1716 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++) 1717 if (tomoyo_str_starts(¶m.data, tomoyo_transition_type[i])) 1718 return tomoyo_write_transition_control(¶m, i); 1719 for (i = 0; i < TOMOYO_MAX_GROUP; i++) 1720 if (tomoyo_str_starts(¶m.data, tomoyo_group_name[i])) 1721 return tomoyo_write_group(¶m, i); 1722 if (tomoyo_str_starts(¶m.data, "acl_group ")) { 1723 unsigned int group; 1724 char *data; 1725 group = simple_strtoul(param.data, &data, 10); 1726 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ') 1727 return tomoyo_write_domain2 1728 (head->w.ns, &head->w.ns->acl_group[group], 1729 data, is_delete); 1730 } 1731 return -EINVAL; 1732 } 1733 1734 /** 1735 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list. 1736 * 1737 * @head: Pointer to "struct tomoyo_io_buffer". 1738 * @idx: Index number. 1739 * 1740 * Returns true on success, false otherwise. 1741 * 1742 * Caller holds tomoyo_read_lock(). 1743 */ 1744 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx) 1745 { 1746 struct tomoyo_policy_namespace *ns = 1747 container_of(head->r.ns, typeof(*ns), namespace_list); 1748 struct list_head *list = &ns->group_list[idx]; 1749 list_for_each_cookie(head->r.group, list) { 1750 struct tomoyo_group *group = 1751 list_entry(head->r.group, typeof(*group), head.list); 1752 list_for_each_cookie(head->r.acl, &group->member_list) { 1753 struct tomoyo_acl_head *ptr = 1754 list_entry(head->r.acl, typeof(*ptr), list); 1755 if (ptr->is_deleted) 1756 continue; 1757 if (!tomoyo_flush(head)) 1758 return false; 1759 tomoyo_print_namespace(head); 1760 tomoyo_set_string(head, tomoyo_group_name[idx]); 1761 tomoyo_set_string(head, group->group_name->name); 1762 if (idx == TOMOYO_PATH_GROUP) { 1763 tomoyo_set_space(head); 1764 tomoyo_set_string(head, container_of 1765 (ptr, struct tomoyo_path_group, 1766 head)->member_name->name); 1767 } else if (idx == TOMOYO_NUMBER_GROUP) { 1768 tomoyo_print_number_union(head, &container_of 1769 (ptr, 1770 struct tomoyo_number_group, 1771 head)->number); 1772 } else if (idx == TOMOYO_ADDRESS_GROUP) { 1773 char buffer[128]; 1774 1775 struct tomoyo_address_group *member = 1776 container_of(ptr, typeof(*member), 1777 head); 1778 tomoyo_print_ip(buffer, sizeof(buffer), 1779 &member->address); 1780 tomoyo_io_printf(head, " %s", buffer); 1781 } 1782 tomoyo_set_lf(head); 1783 } 1784 head->r.acl = NULL; 1785 } 1786 head->r.group = NULL; 1787 return true; 1788 } 1789 1790 /** 1791 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list. 1792 * 1793 * @head: Pointer to "struct tomoyo_io_buffer". 1794 * @idx: Index number. 1795 * 1796 * Returns true on success, false otherwise. 1797 * 1798 * Caller holds tomoyo_read_lock(). 1799 */ 1800 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx) 1801 { 1802 struct tomoyo_policy_namespace *ns = 1803 container_of(head->r.ns, typeof(*ns), namespace_list); 1804 struct list_head *list = &ns->policy_list[idx]; 1805 list_for_each_cookie(head->r.acl, list) { 1806 struct tomoyo_acl_head *acl = 1807 container_of(head->r.acl, typeof(*acl), list); 1808 if (acl->is_deleted) 1809 continue; 1810 if (!tomoyo_flush(head)) 1811 return false; 1812 switch (idx) { 1813 case TOMOYO_ID_TRANSITION_CONTROL: 1814 { 1815 struct tomoyo_transition_control *ptr = 1816 container_of(acl, typeof(*ptr), head); 1817 tomoyo_print_namespace(head); 1818 tomoyo_set_string(head, tomoyo_transition_type 1819 [ptr->type]); 1820 tomoyo_set_string(head, ptr->program ? 1821 ptr->program->name : "any"); 1822 tomoyo_set_string(head, " from "); 1823 tomoyo_set_string(head, ptr->domainname ? 1824 ptr->domainname->name : 1825 "any"); 1826 } 1827 break; 1828 case TOMOYO_ID_AGGREGATOR: 1829 { 1830 struct tomoyo_aggregator *ptr = 1831 container_of(acl, typeof(*ptr), head); 1832 tomoyo_print_namespace(head); 1833 tomoyo_set_string(head, "aggregator "); 1834 tomoyo_set_string(head, 1835 ptr->original_name->name); 1836 tomoyo_set_space(head); 1837 tomoyo_set_string(head, 1838 ptr->aggregated_name->name); 1839 } 1840 break; 1841 default: 1842 continue; 1843 } 1844 tomoyo_set_lf(head); 1845 } 1846 head->r.acl = NULL; 1847 return true; 1848 } 1849 1850 /** 1851 * tomoyo_read_exception - Read exception policy. 1852 * 1853 * @head: Pointer to "struct tomoyo_io_buffer". 1854 * 1855 * Caller holds tomoyo_read_lock(). 1856 */ 1857 static void tomoyo_read_exception(struct tomoyo_io_buffer *head) 1858 { 1859 struct tomoyo_policy_namespace *ns = 1860 container_of(head->r.ns, typeof(*ns), namespace_list); 1861 if (head->r.eof) 1862 return; 1863 while (head->r.step < TOMOYO_MAX_POLICY && 1864 tomoyo_read_policy(head, head->r.step)) 1865 head->r.step++; 1866 if (head->r.step < TOMOYO_MAX_POLICY) 1867 return; 1868 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP && 1869 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY)) 1870 head->r.step++; 1871 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP) 1872 return; 1873 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP 1874 + TOMOYO_MAX_ACL_GROUPS) { 1875 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY 1876 - TOMOYO_MAX_GROUP; 1877 if (!tomoyo_read_domain2(head, &ns->acl_group 1878 [head->r.acl_group_index])) 1879 return; 1880 head->r.step++; 1881 } 1882 head->r.eof = true; 1883 } 1884 1885 /* Wait queue for kernel -> userspace notification. */ 1886 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait); 1887 /* Wait queue for userspace -> kernel notification. */ 1888 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait); 1889 1890 /* Structure for query. */ 1891 struct tomoyo_query { 1892 struct list_head list; 1893 struct tomoyo_domain_info *domain; 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". */ 1903 static LIST_HEAD(tomoyo_query_list); 1904 1905 /* Lock for manipulating tomoyo_query_list. */ 1906 static DEFINE_SPINLOCK(tomoyo_query_list_lock); 1907 1908 /* 1909 * Number of "struct file" referring /sys/kernel/security/tomoyo/query 1910 * interface. 1911 */ 1912 static 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 */ 1921 static 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 */ 1938 static 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 */ 1997 int 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 entry.domain = r->domain; 2045 spin_lock(&tomoyo_query_list_lock); 2046 if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] && 2047 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len 2048 >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) { 2049 quota_exceeded = true; 2050 } else { 2051 entry.serial = tomoyo_serial++; 2052 entry.retry = r->retry; 2053 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len; 2054 list_add_tail(&entry.list, &tomoyo_query_list); 2055 } 2056 spin_unlock(&tomoyo_query_list_lock); 2057 if (quota_exceeded) 2058 goto out; 2059 /* Give 10 seconds for supervisor's opinion. */ 2060 while (entry.timer < 10) { 2061 wake_up_all(&tomoyo_query_wait); 2062 if (wait_event_interruptible_timeout 2063 (tomoyo_answer_wait, entry.answer || 2064 !atomic_read(&tomoyo_query_observers), HZ)) 2065 break; 2066 else 2067 entry.timer++; 2068 } 2069 spin_lock(&tomoyo_query_list_lock); 2070 list_del(&entry.list); 2071 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len; 2072 spin_unlock(&tomoyo_query_list_lock); 2073 switch (entry.answer) { 2074 case 3: /* Asked to retry by administrator. */ 2075 error = TOMOYO_RETRY_REQUEST; 2076 r->retry++; 2077 break; 2078 case 1: 2079 /* Granted by administrator. */ 2080 error = 0; 2081 break; 2082 default: 2083 /* Timed out or rejected by administrator. */ 2084 break; 2085 } 2086 out: 2087 kfree(entry.query); 2088 return error; 2089 } 2090 2091 /** 2092 * tomoyo_find_domain_by_qid - Get domain by query id. 2093 * 2094 * @serial: Query ID assigned by tomoyo_supervisor(). 2095 * 2096 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise. 2097 */ 2098 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid 2099 (unsigned int serial) 2100 { 2101 struct tomoyo_query *ptr; 2102 struct tomoyo_domain_info *domain = NULL; 2103 spin_lock(&tomoyo_query_list_lock); 2104 list_for_each_entry(ptr, &tomoyo_query_list, list) { 2105 if (ptr->serial != serial) 2106 continue; 2107 domain = ptr->domain; 2108 break; 2109 } 2110 spin_unlock(&tomoyo_query_list_lock); 2111 return domain; 2112 } 2113 2114 /** 2115 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query. 2116 * 2117 * @file: Pointer to "struct file". 2118 * @wait: Pointer to "poll_table". 2119 * 2120 * Returns EPOLLIN | EPOLLRDNORM when ready to read, 0 otherwise. 2121 * 2122 * Waits for access requests which violated policy in enforcing mode. 2123 */ 2124 static __poll_t tomoyo_poll_query(struct file *file, poll_table *wait) 2125 { 2126 if (!list_empty(&tomoyo_query_list)) 2127 return EPOLLIN | EPOLLRDNORM; 2128 poll_wait(file, &tomoyo_query_wait, wait); 2129 if (!list_empty(&tomoyo_query_list)) 2130 return EPOLLIN | EPOLLRDNORM; 2131 return 0; 2132 } 2133 2134 /** 2135 * tomoyo_read_query - Read access requests which violated policy in enforcing mode. 2136 * 2137 * @head: Pointer to "struct tomoyo_io_buffer". 2138 */ 2139 static void tomoyo_read_query(struct tomoyo_io_buffer *head) 2140 { 2141 struct list_head *tmp; 2142 unsigned int pos = 0; 2143 size_t len = 0; 2144 char *buf; 2145 if (head->r.w_pos) 2146 return; 2147 if (head->read_buf) { 2148 kfree(head->read_buf); 2149 head->read_buf = NULL; 2150 } 2151 spin_lock(&tomoyo_query_list_lock); 2152 list_for_each(tmp, &tomoyo_query_list) { 2153 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2154 if (pos++ != head->r.query_index) 2155 continue; 2156 len = ptr->query_len; 2157 break; 2158 } 2159 spin_unlock(&tomoyo_query_list_lock); 2160 if (!len) { 2161 head->r.query_index = 0; 2162 return; 2163 } 2164 buf = kzalloc(len + 32, GFP_NOFS); 2165 if (!buf) 2166 return; 2167 pos = 0; 2168 spin_lock(&tomoyo_query_list_lock); 2169 list_for_each(tmp, &tomoyo_query_list) { 2170 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2171 if (pos++ != head->r.query_index) 2172 continue; 2173 /* 2174 * Some query can be skipped because tomoyo_query_list 2175 * can change, but I don't care. 2176 */ 2177 if (len == ptr->query_len) 2178 snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial, 2179 ptr->retry, ptr->query); 2180 break; 2181 } 2182 spin_unlock(&tomoyo_query_list_lock); 2183 if (buf[0]) { 2184 head->read_buf = buf; 2185 head->r.w[head->r.w_pos++] = buf; 2186 head->r.query_index++; 2187 } else { 2188 kfree(buf); 2189 } 2190 } 2191 2192 /** 2193 * tomoyo_write_answer - Write the supervisor's decision. 2194 * 2195 * @head: Pointer to "struct tomoyo_io_buffer". 2196 * 2197 * Returns 0 on success, -EINVAL otherwise. 2198 */ 2199 static int tomoyo_write_answer(struct tomoyo_io_buffer *head) 2200 { 2201 char *data = head->write_buf; 2202 struct list_head *tmp; 2203 unsigned int serial; 2204 unsigned int answer; 2205 spin_lock(&tomoyo_query_list_lock); 2206 list_for_each(tmp, &tomoyo_query_list) { 2207 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2208 ptr->timer = 0; 2209 } 2210 spin_unlock(&tomoyo_query_list_lock); 2211 if (sscanf(data, "A%u=%u", &serial, &answer) != 2) 2212 return -EINVAL; 2213 spin_lock(&tomoyo_query_list_lock); 2214 list_for_each(tmp, &tomoyo_query_list) { 2215 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2216 if (ptr->serial != serial) 2217 continue; 2218 ptr->answer = answer; 2219 /* Remove from tomoyo_query_list. */ 2220 if (ptr->answer) 2221 list_del_init(&ptr->list); 2222 break; 2223 } 2224 spin_unlock(&tomoyo_query_list_lock); 2225 return 0; 2226 } 2227 2228 /** 2229 * tomoyo_read_version: Get version. 2230 * 2231 * @head: Pointer to "struct tomoyo_io_buffer". 2232 * 2233 * Returns version information. 2234 */ 2235 static void tomoyo_read_version(struct tomoyo_io_buffer *head) 2236 { 2237 if (!head->r.eof) { 2238 tomoyo_io_printf(head, "2.5.0"); 2239 head->r.eof = true; 2240 } 2241 } 2242 2243 /* String table for /sys/kernel/security/tomoyo/stat interface. */ 2244 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = { 2245 [TOMOYO_STAT_POLICY_UPDATES] = "update:", 2246 [TOMOYO_STAT_POLICY_LEARNING] = "violation in learning mode:", 2247 [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:", 2248 [TOMOYO_STAT_POLICY_ENFORCING] = "violation in enforcing mode:", 2249 }; 2250 2251 /* String table for /sys/kernel/security/tomoyo/stat interface. */ 2252 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = { 2253 [TOMOYO_MEMORY_POLICY] = "policy:", 2254 [TOMOYO_MEMORY_AUDIT] = "audit log:", 2255 [TOMOYO_MEMORY_QUERY] = "query message:", 2256 }; 2257 2258 /* Timestamp counter for last updated. */ 2259 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT]; 2260 /* Counter for number of updates. */ 2261 static time64_t tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT]; 2262 2263 /** 2264 * tomoyo_update_stat - Update statistic counters. 2265 * 2266 * @index: Index for policy type. 2267 * 2268 * Returns nothing. 2269 */ 2270 void tomoyo_update_stat(const u8 index) 2271 { 2272 /* 2273 * I don't use atomic operations because race condition is not fatal. 2274 */ 2275 tomoyo_stat_updated[index]++; 2276 tomoyo_stat_modified[index] = ktime_get_real_seconds(); 2277 } 2278 2279 /** 2280 * tomoyo_read_stat - Read statistic data. 2281 * 2282 * @head: Pointer to "struct tomoyo_io_buffer". 2283 * 2284 * Returns nothing. 2285 */ 2286 static void tomoyo_read_stat(struct tomoyo_io_buffer *head) 2287 { 2288 u8 i; 2289 unsigned int total = 0; 2290 if (head->r.eof) 2291 return; 2292 for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) { 2293 tomoyo_io_printf(head, "Policy %-30s %10u", 2294 tomoyo_policy_headers[i], 2295 tomoyo_stat_updated[i]); 2296 if (tomoyo_stat_modified[i]) { 2297 struct tomoyo_time stamp; 2298 tomoyo_convert_time(tomoyo_stat_modified[i], &stamp); 2299 tomoyo_io_printf(head, " (Last: %04u/%02u/%02u " 2300 "%02u:%02u:%02u)", 2301 stamp.year, stamp.month, stamp.day, 2302 stamp.hour, stamp.min, stamp.sec); 2303 } 2304 tomoyo_set_lf(head); 2305 } 2306 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) { 2307 unsigned int used = tomoyo_memory_used[i]; 2308 total += used; 2309 tomoyo_io_printf(head, "Memory used by %-22s %10u", 2310 tomoyo_memory_headers[i], used); 2311 used = tomoyo_memory_quota[i]; 2312 if (used) 2313 tomoyo_io_printf(head, " (Quota: %10u)", used); 2314 tomoyo_set_lf(head); 2315 } 2316 tomoyo_io_printf(head, "Total memory used: %10u\n", 2317 total); 2318 head->r.eof = true; 2319 } 2320 2321 /** 2322 * tomoyo_write_stat - Set memory quota. 2323 * 2324 * @head: Pointer to "struct tomoyo_io_buffer". 2325 * 2326 * Returns 0. 2327 */ 2328 static int tomoyo_write_stat(struct tomoyo_io_buffer *head) 2329 { 2330 char *data = head->write_buf; 2331 u8 i; 2332 if (tomoyo_str_starts(&data, "Memory used by ")) 2333 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) 2334 if (tomoyo_str_starts(&data, tomoyo_memory_headers[i])) 2335 sscanf(data, "%u", &tomoyo_memory_quota[i]); 2336 return 0; 2337 } 2338 2339 /** 2340 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. 2341 * 2342 * @type: Type of interface. 2343 * @file: Pointer to "struct file". 2344 * 2345 * Returns 0 on success, negative value otherwise. 2346 */ 2347 int tomoyo_open_control(const u8 type, struct file *file) 2348 { 2349 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS); 2350 2351 if (!head) 2352 return -ENOMEM; 2353 mutex_init(&head->io_sem); 2354 head->type = type; 2355 switch (type) { 2356 case TOMOYO_DOMAINPOLICY: 2357 /* /sys/kernel/security/tomoyo/domain_policy */ 2358 head->write = tomoyo_write_domain; 2359 head->read = tomoyo_read_domain; 2360 break; 2361 case TOMOYO_EXCEPTIONPOLICY: 2362 /* /sys/kernel/security/tomoyo/exception_policy */ 2363 head->write = tomoyo_write_exception; 2364 head->read = tomoyo_read_exception; 2365 break; 2366 case TOMOYO_AUDIT: 2367 /* /sys/kernel/security/tomoyo/audit */ 2368 head->poll = tomoyo_poll_log; 2369 head->read = tomoyo_read_log; 2370 break; 2371 case TOMOYO_PROCESS_STATUS: 2372 /* /sys/kernel/security/tomoyo/.process_status */ 2373 head->write = tomoyo_write_pid; 2374 head->read = tomoyo_read_pid; 2375 break; 2376 case TOMOYO_VERSION: 2377 /* /sys/kernel/security/tomoyo/version */ 2378 head->read = tomoyo_read_version; 2379 head->readbuf_size = 128; 2380 break; 2381 case TOMOYO_STAT: 2382 /* /sys/kernel/security/tomoyo/stat */ 2383 head->write = tomoyo_write_stat; 2384 head->read = tomoyo_read_stat; 2385 head->readbuf_size = 1024; 2386 break; 2387 case TOMOYO_PROFILE: 2388 /* /sys/kernel/security/tomoyo/profile */ 2389 head->write = tomoyo_write_profile; 2390 head->read = tomoyo_read_profile; 2391 break; 2392 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */ 2393 head->poll = tomoyo_poll_query; 2394 head->write = tomoyo_write_answer; 2395 head->read = tomoyo_read_query; 2396 break; 2397 case TOMOYO_MANAGER: 2398 /* /sys/kernel/security/tomoyo/manager */ 2399 head->write = tomoyo_write_manager; 2400 head->read = tomoyo_read_manager; 2401 break; 2402 } 2403 if (!(file->f_mode & FMODE_READ)) { 2404 /* 2405 * No need to allocate read_buf since it is not opened 2406 * for reading. 2407 */ 2408 head->read = NULL; 2409 head->poll = NULL; 2410 } else if (!head->poll) { 2411 /* Don't allocate read_buf for poll() access. */ 2412 if (!head->readbuf_size) 2413 head->readbuf_size = 4096 * 2; 2414 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS); 2415 if (!head->read_buf) { 2416 kfree(head); 2417 return -ENOMEM; 2418 } 2419 } 2420 if (!(file->f_mode & FMODE_WRITE)) { 2421 /* 2422 * No need to allocate write_buf since it is not opened 2423 * for writing. 2424 */ 2425 head->write = NULL; 2426 } else if (head->write) { 2427 head->writebuf_size = 4096 * 2; 2428 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS); 2429 if (!head->write_buf) { 2430 kfree(head->read_buf); 2431 kfree(head); 2432 return -ENOMEM; 2433 } 2434 } 2435 /* 2436 * If the file is /sys/kernel/security/tomoyo/query , increment the 2437 * observer counter. 2438 * The obserber counter is used by tomoyo_supervisor() to see if 2439 * there is some process monitoring /sys/kernel/security/tomoyo/query. 2440 */ 2441 if (type == TOMOYO_QUERY) 2442 atomic_inc(&tomoyo_query_observers); 2443 file->private_data = head; 2444 tomoyo_notify_gc(head, true); 2445 return 0; 2446 } 2447 2448 /** 2449 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface. 2450 * 2451 * @file: Pointer to "struct file". 2452 * @wait: Pointer to "poll_table". Maybe NULL. 2453 * 2454 * Returns EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM if ready to read/write, 2455 * EPOLLOUT | EPOLLWRNORM otherwise. 2456 */ 2457 __poll_t tomoyo_poll_control(struct file *file, poll_table *wait) 2458 { 2459 struct tomoyo_io_buffer *head = file->private_data; 2460 if (head->poll) 2461 return head->poll(file, wait) | EPOLLOUT | EPOLLWRNORM; 2462 return EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM; 2463 } 2464 2465 /** 2466 * tomoyo_set_namespace_cursor - Set namespace to read. 2467 * 2468 * @head: Pointer to "struct tomoyo_io_buffer". 2469 * 2470 * Returns nothing. 2471 */ 2472 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head) 2473 { 2474 struct list_head *ns; 2475 if (head->type != TOMOYO_EXCEPTIONPOLICY && 2476 head->type != TOMOYO_PROFILE) 2477 return; 2478 /* 2479 * If this is the first read, or reading previous namespace finished 2480 * and has more namespaces to read, update the namespace cursor. 2481 */ 2482 ns = head->r.ns; 2483 if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) { 2484 /* Clearing is OK because tomoyo_flush() returned true. */ 2485 memset(&head->r, 0, sizeof(head->r)); 2486 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next; 2487 } 2488 } 2489 2490 /** 2491 * tomoyo_has_more_namespace - Check for unread namespaces. 2492 * 2493 * @head: Pointer to "struct tomoyo_io_buffer". 2494 * 2495 * Returns true if we have more entries to print, false otherwise. 2496 */ 2497 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head) 2498 { 2499 return (head->type == TOMOYO_EXCEPTIONPOLICY || 2500 head->type == TOMOYO_PROFILE) && head->r.eof && 2501 head->r.ns->next != &tomoyo_namespace_list; 2502 } 2503 2504 /** 2505 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. 2506 * 2507 * @head: Pointer to "struct tomoyo_io_buffer". 2508 * @buffer: Poiner to buffer to write to. 2509 * @buffer_len: Size of @buffer. 2510 * 2511 * Returns bytes read on success, negative value otherwise. 2512 */ 2513 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer, 2514 const int buffer_len) 2515 { 2516 int len; 2517 int idx; 2518 2519 if (!head->read) 2520 return -ENOSYS; 2521 if (mutex_lock_interruptible(&head->io_sem)) 2522 return -EINTR; 2523 head->read_user_buf = buffer; 2524 head->read_user_buf_avail = buffer_len; 2525 idx = tomoyo_read_lock(); 2526 if (tomoyo_flush(head)) 2527 /* Call the policy handler. */ 2528 do { 2529 tomoyo_set_namespace_cursor(head); 2530 head->read(head); 2531 } while (tomoyo_flush(head) && 2532 tomoyo_has_more_namespace(head)); 2533 tomoyo_read_unlock(idx); 2534 len = head->read_user_buf - buffer; 2535 mutex_unlock(&head->io_sem); 2536 return len; 2537 } 2538 2539 /** 2540 * tomoyo_parse_policy - Parse a policy line. 2541 * 2542 * @head: Poiter to "struct tomoyo_io_buffer". 2543 * @line: Line to parse. 2544 * 2545 * Returns 0 on success, negative value otherwise. 2546 * 2547 * Caller holds tomoyo_read_lock(). 2548 */ 2549 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line) 2550 { 2551 /* Delete request? */ 2552 head->w.is_delete = !strncmp(line, "delete ", 7); 2553 if (head->w.is_delete) 2554 memmove(line, line + 7, strlen(line + 7) + 1); 2555 /* Selecting namespace to update. */ 2556 if (head->type == TOMOYO_EXCEPTIONPOLICY || 2557 head->type == TOMOYO_PROFILE) { 2558 if (*line == '<') { 2559 char *cp = strchr(line, ' '); 2560 if (cp) { 2561 *cp++ = '\0'; 2562 head->w.ns = tomoyo_assign_namespace(line); 2563 memmove(line, cp, strlen(cp) + 1); 2564 } else 2565 head->w.ns = NULL; 2566 } else 2567 head->w.ns = &tomoyo_kernel_namespace; 2568 /* Don't allow updating if namespace is invalid. */ 2569 if (!head->w.ns) 2570 return -ENOENT; 2571 } 2572 /* Do the update. */ 2573 return head->write(head); 2574 } 2575 2576 /** 2577 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. 2578 * 2579 * @head: Pointer to "struct tomoyo_io_buffer". 2580 * @buffer: Pointer to buffer to read from. 2581 * @buffer_len: Size of @buffer. 2582 * 2583 * Returns @buffer_len on success, negative value otherwise. 2584 */ 2585 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head, 2586 const char __user *buffer, const int buffer_len) 2587 { 2588 int error = buffer_len; 2589 size_t avail_len = buffer_len; 2590 char *cp0 = head->write_buf; 2591 int idx; 2592 if (!head->write) 2593 return -ENOSYS; 2594 if (!access_ok(buffer, buffer_len)) 2595 return -EFAULT; 2596 if (mutex_lock_interruptible(&head->io_sem)) 2597 return -EINTR; 2598 head->read_user_buf_avail = 0; 2599 idx = tomoyo_read_lock(); 2600 /* Read a line and dispatch it to the policy handler. */ 2601 while (avail_len > 0) { 2602 char c; 2603 if (head->w.avail >= head->writebuf_size - 1) { 2604 const int len = head->writebuf_size * 2; 2605 char *cp = kzalloc(len, GFP_NOFS); 2606 if (!cp) { 2607 error = -ENOMEM; 2608 break; 2609 } 2610 memmove(cp, cp0, head->w.avail); 2611 kfree(cp0); 2612 head->write_buf = cp; 2613 cp0 = cp; 2614 head->writebuf_size = len; 2615 } 2616 if (get_user(c, buffer)) { 2617 error = -EFAULT; 2618 break; 2619 } 2620 buffer++; 2621 avail_len--; 2622 cp0[head->w.avail++] = c; 2623 if (c != '\n') 2624 continue; 2625 cp0[head->w.avail - 1] = '\0'; 2626 head->w.avail = 0; 2627 tomoyo_normalize_line(cp0); 2628 if (!strcmp(cp0, "reset")) { 2629 head->w.ns = &tomoyo_kernel_namespace; 2630 head->w.domain = NULL; 2631 memset(&head->r, 0, sizeof(head->r)); 2632 continue; 2633 } 2634 /* Don't allow updating policies by non manager programs. */ 2635 switch (head->type) { 2636 case TOMOYO_PROCESS_STATUS: 2637 /* This does not write anything. */ 2638 break; 2639 case TOMOYO_DOMAINPOLICY: 2640 if (tomoyo_select_domain(head, cp0)) 2641 continue; 2642 /* fall through */ 2643 case TOMOYO_EXCEPTIONPOLICY: 2644 if (!strcmp(cp0, "select transition_only")) { 2645 head->r.print_transition_related_only = true; 2646 continue; 2647 } 2648 /* fall through */ 2649 default: 2650 if (!tomoyo_manager()) { 2651 error = -EPERM; 2652 goto out; 2653 } 2654 } 2655 switch (tomoyo_parse_policy(head, cp0)) { 2656 case -EPERM: 2657 error = -EPERM; 2658 goto out; 2659 case 0: 2660 switch (head->type) { 2661 case TOMOYO_DOMAINPOLICY: 2662 case TOMOYO_EXCEPTIONPOLICY: 2663 case TOMOYO_STAT: 2664 case TOMOYO_PROFILE: 2665 case TOMOYO_MANAGER: 2666 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES); 2667 break; 2668 default: 2669 break; 2670 } 2671 break; 2672 } 2673 } 2674 out: 2675 tomoyo_read_unlock(idx); 2676 mutex_unlock(&head->io_sem); 2677 return error; 2678 } 2679 2680 /** 2681 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. 2682 * 2683 * @head: Pointer to "struct tomoyo_io_buffer". 2684 */ 2685 void tomoyo_close_control(struct tomoyo_io_buffer *head) 2686 { 2687 /* 2688 * If the file is /sys/kernel/security/tomoyo/query , decrement the 2689 * observer counter. 2690 */ 2691 if (head->type == TOMOYO_QUERY && 2692 atomic_dec_and_test(&tomoyo_query_observers)) 2693 wake_up_all(&tomoyo_answer_wait); 2694 tomoyo_notify_gc(head, false); 2695 } 2696 2697 /** 2698 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined. 2699 */ 2700 void tomoyo_check_profile(void) 2701 { 2702 struct tomoyo_domain_info *domain; 2703 const int idx = tomoyo_read_lock(); 2704 tomoyo_policy_loaded = true; 2705 printk(KERN_INFO "TOMOYO: 2.5.0\n"); 2706 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 2707 const u8 profile = domain->profile; 2708 const struct tomoyo_policy_namespace *ns = domain->ns; 2709 if (ns->profile_version != 20110903) 2710 printk(KERN_ERR 2711 "Profile version %u is not supported.\n", 2712 ns->profile_version); 2713 else if (!ns->profile_ptr[profile]) 2714 printk(KERN_ERR 2715 "Profile %u (used by '%s') is not defined.\n", 2716 profile, domain->domainname->name); 2717 else 2718 continue; 2719 printk(KERN_ERR 2720 "Userland tools for TOMOYO 2.5 must be installed and " 2721 "policy must be initialized.\n"); 2722 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ " 2723 "for more information.\n"); 2724 panic("STOP!"); 2725 } 2726 tomoyo_read_unlock(idx); 2727 printk(KERN_INFO "Mandatory Access Control activated.\n"); 2728 } 2729 2730 /** 2731 * tomoyo_load_builtin_policy - Load built-in policy. 2732 * 2733 * Returns nothing. 2734 */ 2735 void __init tomoyo_load_builtin_policy(void) 2736 { 2737 /* 2738 * This include file is manually created and contains built-in policy 2739 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy", 2740 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager", 2741 * "tomoyo_builtin_stat" in the form of "static char [] __initdata". 2742 */ 2743 #include "builtin-policy.h" 2744 u8 i; 2745 const int idx = tomoyo_read_lock(); 2746 for (i = 0; i < 5; i++) { 2747 struct tomoyo_io_buffer head = { }; 2748 char *start = ""; 2749 switch (i) { 2750 case 0: 2751 start = tomoyo_builtin_profile; 2752 head.type = TOMOYO_PROFILE; 2753 head.write = tomoyo_write_profile; 2754 break; 2755 case 1: 2756 start = tomoyo_builtin_exception_policy; 2757 head.type = TOMOYO_EXCEPTIONPOLICY; 2758 head.write = tomoyo_write_exception; 2759 break; 2760 case 2: 2761 start = tomoyo_builtin_domain_policy; 2762 head.type = TOMOYO_DOMAINPOLICY; 2763 head.write = tomoyo_write_domain; 2764 break; 2765 case 3: 2766 start = tomoyo_builtin_manager; 2767 head.type = TOMOYO_MANAGER; 2768 head.write = tomoyo_write_manager; 2769 break; 2770 case 4: 2771 start = tomoyo_builtin_stat; 2772 head.type = TOMOYO_STAT; 2773 head.write = tomoyo_write_stat; 2774 break; 2775 } 2776 while (1) { 2777 char *end = strchr(start, '\n'); 2778 if (!end) 2779 break; 2780 *end = '\0'; 2781 tomoyo_normalize_line(start); 2782 head.write_buf = start; 2783 tomoyo_parse_policy(&head, start); 2784 start = end + 1; 2785 } 2786 } 2787 tomoyo_read_unlock(idx); 2788 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER 2789 tomoyo_check_profile(); 2790 #endif 2791 } 2792