common.c revision 59df3166ef293288d164ab3362a717743e62d20c
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 966static struct tomoyo_domain_info *tomoyo_find_domain_by_qid 967(unsigned int serial); 968 969/** 970 * tomoyo_select_domain - Parse select command. 971 * 972 * @head: Pointer to "struct tomoyo_io_buffer". 973 * @data: String to parse. 974 * 975 * Returns true on success, false otherwise. 976 * 977 * Caller holds tomoyo_read_lock(). 978 */ 979static bool tomoyo_select_domain(struct tomoyo_io_buffer *head, 980 const char *data) 981{ 982 unsigned int pid; 983 struct tomoyo_domain_info *domain = NULL; 984 bool global_pid = false; 985 if (strncmp(data, "select ", 7)) 986 return false; 987 data += 7; 988 if (sscanf(data, "pid=%u", &pid) == 1 || 989 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { 990 struct task_struct *p; 991 rcu_read_lock(); 992 if (global_pid) 993 p = find_task_by_pid_ns(pid, &init_pid_ns); 994 else 995 p = find_task_by_vpid(pid); 996 if (p) 997 domain = tomoyo_real_domain(p); 998 rcu_read_unlock(); 999 } else if (!strncmp(data, "domain=", 7)) { 1000 if (tomoyo_domain_def(data + 7)) 1001 domain = tomoyo_find_domain(data + 7); 1002 } else if (sscanf(data, "Q=%u", &pid) == 1) { 1003 domain = tomoyo_find_domain_by_qid(pid); 1004 } else 1005 return false; 1006 head->w.domain = domain; 1007 /* Accessing read_buf is safe because head->io_sem is held. */ 1008 if (!head->read_buf) 1009 return true; /* Do nothing if open(O_WRONLY). */ 1010 memset(&head->r, 0, sizeof(head->r)); 1011 head->r.print_this_domain_only = true; 1012 if (domain) 1013 head->r.domain = &domain->list; 1014 else 1015 head->r.eof = 1; 1016 tomoyo_io_printf(head, "# select %s\n", data); 1017 if (domain && domain->is_deleted) 1018 tomoyo_io_printf(head, "# This is a deleted domain.\n"); 1019 return true; 1020} 1021 1022/** 1023 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry. 1024 * 1025 * @a: Pointer to "struct tomoyo_acl_info". 1026 * @b: Pointer to "struct tomoyo_acl_info". 1027 * 1028 * Returns true if @a == @b, false otherwise. 1029 */ 1030static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a, 1031 const struct tomoyo_acl_info *b) 1032{ 1033 const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head); 1034 const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head); 1035 return p1->domainname == p2->domainname; 1036} 1037 1038/** 1039 * tomoyo_write_task - Update task related list. 1040 * 1041 * @param: Pointer to "struct tomoyo_acl_param". 1042 * 1043 * Returns 0 on success, negative value otherwise. 1044 * 1045 * Caller holds tomoyo_read_lock(). 1046 */ 1047static int tomoyo_write_task(struct tomoyo_acl_param *param) 1048{ 1049 int error = -EINVAL; 1050 if (tomoyo_str_starts(¶m->data, "manual_domain_transition ")) { 1051 struct tomoyo_task_acl e = { 1052 .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL, 1053 .domainname = tomoyo_get_domainname(param), 1054 }; 1055 if (e.domainname) 1056 error = tomoyo_update_domain(&e.head, sizeof(e), param, 1057 tomoyo_same_task_acl, 1058 NULL); 1059 tomoyo_put_name(e.domainname); 1060 } 1061 return error; 1062} 1063 1064/** 1065 * tomoyo_delete_domain - Delete a domain. 1066 * 1067 * @domainname: The name of domain. 1068 * 1069 * Returns 0. 1070 * 1071 * Caller holds tomoyo_read_lock(). 1072 */ 1073static int tomoyo_delete_domain(char *domainname) 1074{ 1075 struct tomoyo_domain_info *domain; 1076 struct tomoyo_path_info name; 1077 1078 name.name = domainname; 1079 tomoyo_fill_path_info(&name); 1080 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 1081 return 0; 1082 /* Is there an active domain? */ 1083 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 1084 /* Never delete tomoyo_kernel_domain */ 1085 if (domain == &tomoyo_kernel_domain) 1086 continue; 1087 if (domain->is_deleted || 1088 tomoyo_pathcmp(domain->domainname, &name)) 1089 continue; 1090 domain->is_deleted = true; 1091 break; 1092 } 1093 mutex_unlock(&tomoyo_policy_lock); 1094 return 0; 1095} 1096 1097/** 1098 * tomoyo_write_domain2 - Write domain policy. 1099 * 1100 * @ns: Pointer to "struct tomoyo_policy_namespace". 1101 * @list: Pointer to "struct list_head". 1102 * @data: Policy to be interpreted. 1103 * @is_delete: True if it is a delete request. 1104 * 1105 * Returns 0 on success, negative value otherwise. 1106 * 1107 * Caller holds tomoyo_read_lock(). 1108 */ 1109static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns, 1110 struct list_head *list, char *data, 1111 const bool is_delete) 1112{ 1113 struct tomoyo_acl_param param = { 1114 .ns = ns, 1115 .list = list, 1116 .data = data, 1117 .is_delete = is_delete, 1118 }; 1119 static const struct { 1120 const char *keyword; 1121 int (*write) (struct tomoyo_acl_param *); 1122 } tomoyo_callback[5] = { 1123 { "file ", tomoyo_write_file }, 1124 { "network inet ", tomoyo_write_inet_network }, 1125 { "network unix ", tomoyo_write_unix_network }, 1126 { "misc ", tomoyo_write_misc }, 1127 { "task ", tomoyo_write_task }, 1128 }; 1129 u8 i; 1130 1131 for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) { 1132 if (!tomoyo_str_starts(¶m.data, 1133 tomoyo_callback[i].keyword)) 1134 continue; 1135 return tomoyo_callback[i].write(¶m); 1136 } 1137 return -EINVAL; 1138} 1139 1140/* String table for domain flags. */ 1141const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = { 1142 [TOMOYO_DIF_QUOTA_WARNED] = "quota_exceeded\n", 1143 [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n", 1144}; 1145 1146/** 1147 * tomoyo_write_domain - Write domain policy. 1148 * 1149 * @head: Pointer to "struct tomoyo_io_buffer". 1150 * 1151 * Returns 0 on success, negative value otherwise. 1152 * 1153 * Caller holds tomoyo_read_lock(). 1154 */ 1155static int tomoyo_write_domain(struct tomoyo_io_buffer *head) 1156{ 1157 char *data = head->write_buf; 1158 struct tomoyo_policy_namespace *ns; 1159 struct tomoyo_domain_info *domain = head->w.domain; 1160 const bool is_delete = head->w.is_delete; 1161 bool is_select = !is_delete && tomoyo_str_starts(&data, "select "); 1162 unsigned int profile; 1163 if (*data == '<') { 1164 domain = NULL; 1165 if (is_delete) 1166 tomoyo_delete_domain(data); 1167 else if (is_select) 1168 domain = tomoyo_find_domain(data); 1169 else 1170 domain = tomoyo_assign_domain(data, false); 1171 head->w.domain = domain; 1172 return 0; 1173 } 1174 if (!domain) 1175 return -EINVAL; 1176 ns = domain->ns; 1177 if (sscanf(data, "use_profile %u", &profile) == 1 1178 && profile < TOMOYO_MAX_PROFILES) { 1179 if (!tomoyo_policy_loaded || ns->profile_ptr[profile]) 1180 domain->profile = (u8) profile; 1181 return 0; 1182 } 1183 if (sscanf(data, "use_group %u\n", &profile) == 1 1184 && profile < TOMOYO_MAX_ACL_GROUPS) { 1185 if (!is_delete) 1186 domain->group = (u8) profile; 1187 return 0; 1188 } 1189 for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) { 1190 const char *cp = tomoyo_dif[profile]; 1191 if (strncmp(data, cp, strlen(cp) - 1)) 1192 continue; 1193 domain->flags[profile] = !is_delete; 1194 return 0; 1195 } 1196 return tomoyo_write_domain2(ns, &domain->acl_info_list, data, 1197 is_delete); 1198} 1199 1200/** 1201 * tomoyo_print_condition - Print condition part. 1202 * 1203 * @head: Pointer to "struct tomoyo_io_buffer". 1204 * @cond: Pointer to "struct tomoyo_condition". 1205 * 1206 * Returns true on success, false otherwise. 1207 */ 1208static bool tomoyo_print_condition(struct tomoyo_io_buffer *head, 1209 const struct tomoyo_condition *cond) 1210{ 1211 switch (head->r.cond_step) { 1212 case 0: 1213 head->r.cond_index = 0; 1214 head->r.cond_step++; 1215 if (cond->transit) { 1216 tomoyo_set_space(head); 1217 tomoyo_set_string(head, cond->transit->name); 1218 } 1219 /* fall through */ 1220 case 1: 1221 { 1222 const u16 condc = cond->condc; 1223 const struct tomoyo_condition_element *condp = 1224 (typeof(condp)) (cond + 1); 1225 const struct tomoyo_number_union *numbers_p = 1226 (typeof(numbers_p)) (condp + condc); 1227 const struct tomoyo_name_union *names_p = 1228 (typeof(names_p)) 1229 (numbers_p + cond->numbers_count); 1230 const struct tomoyo_argv *argv = 1231 (typeof(argv)) (names_p + cond->names_count); 1232 const struct tomoyo_envp *envp = 1233 (typeof(envp)) (argv + cond->argc); 1234 u16 skip; 1235 for (skip = 0; skip < head->r.cond_index; skip++) { 1236 const u8 left = condp->left; 1237 const u8 right = condp->right; 1238 condp++; 1239 switch (left) { 1240 case TOMOYO_ARGV_ENTRY: 1241 argv++; 1242 continue; 1243 case TOMOYO_ENVP_ENTRY: 1244 envp++; 1245 continue; 1246 case TOMOYO_NUMBER_UNION: 1247 numbers_p++; 1248 break; 1249 } 1250 switch (right) { 1251 case TOMOYO_NAME_UNION: 1252 names_p++; 1253 break; 1254 case TOMOYO_NUMBER_UNION: 1255 numbers_p++; 1256 break; 1257 } 1258 } 1259 while (head->r.cond_index < condc) { 1260 const u8 match = condp->equals; 1261 const u8 left = condp->left; 1262 const u8 right = condp->right; 1263 if (!tomoyo_flush(head)) 1264 return false; 1265 condp++; 1266 head->r.cond_index++; 1267 tomoyo_set_space(head); 1268 switch (left) { 1269 case TOMOYO_ARGV_ENTRY: 1270 tomoyo_io_printf(head, 1271 "exec.argv[%lu]%s=\"", 1272 argv->index, argv-> 1273 is_not ? "!" : ""); 1274 tomoyo_set_string(head, 1275 argv->value->name); 1276 tomoyo_set_string(head, "\""); 1277 argv++; 1278 continue; 1279 case TOMOYO_ENVP_ENTRY: 1280 tomoyo_set_string(head, 1281 "exec.envp[\""); 1282 tomoyo_set_string(head, 1283 envp->name->name); 1284 tomoyo_io_printf(head, "\"]%s=", envp-> 1285 is_not ? "!" : ""); 1286 if (envp->value) { 1287 tomoyo_set_string(head, "\""); 1288 tomoyo_set_string(head, envp-> 1289 value->name); 1290 tomoyo_set_string(head, "\""); 1291 } else { 1292 tomoyo_set_string(head, 1293 "NULL"); 1294 } 1295 envp++; 1296 continue; 1297 case TOMOYO_NUMBER_UNION: 1298 tomoyo_print_number_union_nospace 1299 (head, numbers_p++); 1300 break; 1301 default: 1302 tomoyo_set_string(head, 1303 tomoyo_condition_keyword[left]); 1304 break; 1305 } 1306 tomoyo_set_string(head, match ? "=" : "!="); 1307 switch (right) { 1308 case TOMOYO_NAME_UNION: 1309 tomoyo_print_name_union_quoted 1310 (head, names_p++); 1311 break; 1312 case TOMOYO_NUMBER_UNION: 1313 tomoyo_print_number_union_nospace 1314 (head, numbers_p++); 1315 break; 1316 default: 1317 tomoyo_set_string(head, 1318 tomoyo_condition_keyword[right]); 1319 break; 1320 } 1321 } 1322 } 1323 head->r.cond_step++; 1324 /* fall through */ 1325 case 2: 1326 if (!tomoyo_flush(head)) 1327 break; 1328 head->r.cond_step++; 1329 /* fall through */ 1330 case 3: 1331 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO) 1332 tomoyo_io_printf(head, " grant_log=%s", 1333 tomoyo_yesno(cond->grant_log == 1334 TOMOYO_GRANTLOG_YES)); 1335 tomoyo_set_lf(head); 1336 return true; 1337 } 1338 return false; 1339} 1340 1341/** 1342 * tomoyo_set_group - Print "acl_group " header keyword and category name. 1343 * 1344 * @head: Pointer to "struct tomoyo_io_buffer". 1345 * @category: Category name. 1346 * 1347 * Returns nothing. 1348 */ 1349static void tomoyo_set_group(struct tomoyo_io_buffer *head, 1350 const char *category) 1351{ 1352 if (head->type == TOMOYO_EXCEPTIONPOLICY) { 1353 tomoyo_print_namespace(head); 1354 tomoyo_io_printf(head, "acl_group %u ", 1355 head->r.acl_group_index); 1356 } 1357 tomoyo_set_string(head, category); 1358} 1359 1360/** 1361 * tomoyo_print_entry - Print an ACL entry. 1362 * 1363 * @head: Pointer to "struct tomoyo_io_buffer". 1364 * @acl: Pointer to an ACL entry. 1365 * 1366 * Returns true on success, false otherwise. 1367 */ 1368static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, 1369 struct tomoyo_acl_info *acl) 1370{ 1371 const u8 acl_type = acl->type; 1372 bool first = true; 1373 u8 bit; 1374 1375 if (head->r.print_cond_part) 1376 goto print_cond_part; 1377 if (acl->is_deleted) 1378 return true; 1379 if (!tomoyo_flush(head)) 1380 return false; 1381 else if (acl_type == TOMOYO_TYPE_PATH_ACL) { 1382 struct tomoyo_path_acl *ptr = 1383 container_of(acl, typeof(*ptr), head); 1384 const u16 perm = ptr->perm; 1385 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { 1386 if (!(perm & (1 << bit))) 1387 continue; 1388 if (head->r.print_transition_related_only && 1389 bit != TOMOYO_TYPE_EXECUTE) 1390 continue; 1391 if (first) { 1392 tomoyo_set_group(head, "file "); 1393 first = false; 1394 } else { 1395 tomoyo_set_slash(head); 1396 } 1397 tomoyo_set_string(head, tomoyo_path_keyword[bit]); 1398 } 1399 if (first) 1400 return true; 1401 tomoyo_print_name_union(head, &ptr->name); 1402 } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) { 1403 struct tomoyo_task_acl *ptr = 1404 container_of(acl, typeof(*ptr), head); 1405 tomoyo_set_group(head, "task "); 1406 tomoyo_set_string(head, "manual_domain_transition "); 1407 tomoyo_set_string(head, ptr->domainname->name); 1408 } else if (head->r.print_transition_related_only) { 1409 return true; 1410 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) { 1411 struct tomoyo_path2_acl *ptr = 1412 container_of(acl, typeof(*ptr), head); 1413 const u8 perm = ptr->perm; 1414 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) { 1415 if (!(perm & (1 << bit))) 1416 continue; 1417 if (first) { 1418 tomoyo_set_group(head, "file "); 1419 first = false; 1420 } else { 1421 tomoyo_set_slash(head); 1422 } 1423 tomoyo_set_string(head, tomoyo_mac_keywords 1424 [tomoyo_pp2mac[bit]]); 1425 } 1426 if (first) 1427 return true; 1428 tomoyo_print_name_union(head, &ptr->name1); 1429 tomoyo_print_name_union(head, &ptr->name2); 1430 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) { 1431 struct tomoyo_path_number_acl *ptr = 1432 container_of(acl, typeof(*ptr), head); 1433 const u8 perm = ptr->perm; 1434 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) { 1435 if (!(perm & (1 << bit))) 1436 continue; 1437 if (first) { 1438 tomoyo_set_group(head, "file "); 1439 first = false; 1440 } else { 1441 tomoyo_set_slash(head); 1442 } 1443 tomoyo_set_string(head, tomoyo_mac_keywords 1444 [tomoyo_pn2mac[bit]]); 1445 } 1446 if (first) 1447 return true; 1448 tomoyo_print_name_union(head, &ptr->name); 1449 tomoyo_print_number_union(head, &ptr->number); 1450 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) { 1451 struct tomoyo_mkdev_acl *ptr = 1452 container_of(acl, typeof(*ptr), head); 1453 const u8 perm = ptr->perm; 1454 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) { 1455 if (!(perm & (1 << bit))) 1456 continue; 1457 if (first) { 1458 tomoyo_set_group(head, "file "); 1459 first = false; 1460 } else { 1461 tomoyo_set_slash(head); 1462 } 1463 tomoyo_set_string(head, tomoyo_mac_keywords 1464 [tomoyo_pnnn2mac[bit]]); 1465 } 1466 if (first) 1467 return true; 1468 tomoyo_print_name_union(head, &ptr->name); 1469 tomoyo_print_number_union(head, &ptr->mode); 1470 tomoyo_print_number_union(head, &ptr->major); 1471 tomoyo_print_number_union(head, &ptr->minor); 1472 } else if (acl_type == TOMOYO_TYPE_INET_ACL) { 1473 struct tomoyo_inet_acl *ptr = 1474 container_of(acl, typeof(*ptr), head); 1475 const u8 perm = ptr->perm; 1476 1477 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) { 1478 if (!(perm & (1 << bit))) 1479 continue; 1480 if (first) { 1481 tomoyo_set_group(head, "network inet "); 1482 tomoyo_set_string(head, tomoyo_proto_keyword 1483 [ptr->protocol]); 1484 tomoyo_set_space(head); 1485 first = false; 1486 } else { 1487 tomoyo_set_slash(head); 1488 } 1489 tomoyo_set_string(head, tomoyo_socket_keyword[bit]); 1490 } 1491 if (first) 1492 return true; 1493 tomoyo_set_space(head); 1494 if (ptr->address.group) { 1495 tomoyo_set_string(head, "@"); 1496 tomoyo_set_string(head, ptr->address.group->group_name 1497 ->name); 1498 } else { 1499 char buf[128]; 1500 tomoyo_print_ip(buf, sizeof(buf), &ptr->address); 1501 tomoyo_io_printf(head, "%s", buf); 1502 } 1503 tomoyo_print_number_union(head, &ptr->port); 1504 } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) { 1505 struct tomoyo_unix_acl *ptr = 1506 container_of(acl, typeof(*ptr), head); 1507 const u8 perm = ptr->perm; 1508 1509 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) { 1510 if (!(perm & (1 << bit))) 1511 continue; 1512 if (first) { 1513 tomoyo_set_group(head, "network unix "); 1514 tomoyo_set_string(head, tomoyo_proto_keyword 1515 [ptr->protocol]); 1516 tomoyo_set_space(head); 1517 first = false; 1518 } else { 1519 tomoyo_set_slash(head); 1520 } 1521 tomoyo_set_string(head, tomoyo_socket_keyword[bit]); 1522 } 1523 if (first) 1524 return true; 1525 tomoyo_print_name_union(head, &ptr->name); 1526 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) { 1527 struct tomoyo_mount_acl *ptr = 1528 container_of(acl, typeof(*ptr), head); 1529 tomoyo_set_group(head, "file mount"); 1530 tomoyo_print_name_union(head, &ptr->dev_name); 1531 tomoyo_print_name_union(head, &ptr->dir_name); 1532 tomoyo_print_name_union(head, &ptr->fs_type); 1533 tomoyo_print_number_union(head, &ptr->flags); 1534 } else if (acl_type == TOMOYO_TYPE_ENV_ACL) { 1535 struct tomoyo_env_acl *ptr = 1536 container_of(acl, typeof(*ptr), head); 1537 1538 tomoyo_set_group(head, "misc env "); 1539 tomoyo_set_string(head, ptr->env->name); 1540 } 1541 if (acl->cond) { 1542 head->r.print_cond_part = true; 1543 head->r.cond_step = 0; 1544 if (!tomoyo_flush(head)) 1545 return false; 1546print_cond_part: 1547 if (!tomoyo_print_condition(head, acl->cond)) 1548 return false; 1549 head->r.print_cond_part = false; 1550 } else { 1551 tomoyo_set_lf(head); 1552 } 1553 return true; 1554} 1555 1556/** 1557 * tomoyo_read_domain2 - Read domain policy. 1558 * 1559 * @head: Pointer to "struct tomoyo_io_buffer". 1560 * @list: Pointer to "struct list_head". 1561 * 1562 * Caller holds tomoyo_read_lock(). 1563 * 1564 * Returns true on success, false otherwise. 1565 */ 1566static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head, 1567 struct list_head *list) 1568{ 1569 list_for_each_cookie(head->r.acl, list) { 1570 struct tomoyo_acl_info *ptr = 1571 list_entry(head->r.acl, typeof(*ptr), list); 1572 if (!tomoyo_print_entry(head, ptr)) 1573 return false; 1574 } 1575 head->r.acl = NULL; 1576 return true; 1577} 1578 1579/** 1580 * tomoyo_read_domain - Read domain policy. 1581 * 1582 * @head: Pointer to "struct tomoyo_io_buffer". 1583 * 1584 * Caller holds tomoyo_read_lock(). 1585 */ 1586static void tomoyo_read_domain(struct tomoyo_io_buffer *head) 1587{ 1588 if (head->r.eof) 1589 return; 1590 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) { 1591 struct tomoyo_domain_info *domain = 1592 list_entry(head->r.domain, typeof(*domain), list); 1593 switch (head->r.step) { 1594 u8 i; 1595 case 0: 1596 if (domain->is_deleted && 1597 !head->r.print_this_domain_only) 1598 continue; 1599 /* Print domainname and flags. */ 1600 tomoyo_set_string(head, domain->domainname->name); 1601 tomoyo_set_lf(head); 1602 tomoyo_io_printf(head, "use_profile %u\n", 1603 domain->profile); 1604 tomoyo_io_printf(head, "use_group %u\n", 1605 domain->group); 1606 for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++) 1607 if (domain->flags[i]) 1608 tomoyo_set_string(head, tomoyo_dif[i]); 1609 head->r.step++; 1610 tomoyo_set_lf(head); 1611 /* fall through */ 1612 case 1: 1613 if (!tomoyo_read_domain2(head, &domain->acl_info_list)) 1614 return; 1615 head->r.step++; 1616 if (!tomoyo_set_lf(head)) 1617 return; 1618 /* fall through */ 1619 case 2: 1620 head->r.step = 0; 1621 if (head->r.print_this_domain_only) 1622 goto done; 1623 } 1624 } 1625 done: 1626 head->r.eof = true; 1627} 1628 1629/** 1630 * tomoyo_write_pid: Specify PID to obtain domainname. 1631 * 1632 * @head: Pointer to "struct tomoyo_io_buffer". 1633 * 1634 * Returns 0. 1635 */ 1636static int tomoyo_write_pid(struct tomoyo_io_buffer *head) 1637{ 1638 head->r.eof = false; 1639 return 0; 1640} 1641 1642/** 1643 * tomoyo_read_pid - Get domainname of the specified PID. 1644 * 1645 * @head: Pointer to "struct tomoyo_io_buffer". 1646 * 1647 * Returns the domainname which the specified PID is in on success, 1648 * empty string otherwise. 1649 * The PID is specified by tomoyo_write_pid() so that the user can obtain 1650 * using read()/write() interface rather than sysctl() interface. 1651 */ 1652static void tomoyo_read_pid(struct tomoyo_io_buffer *head) 1653{ 1654 char *buf = head->write_buf; 1655 bool global_pid = false; 1656 unsigned int pid; 1657 struct task_struct *p; 1658 struct tomoyo_domain_info *domain = NULL; 1659 1660 /* Accessing write_buf is safe because head->io_sem is held. */ 1661 if (!buf) { 1662 head->r.eof = true; 1663 return; /* Do nothing if open(O_RDONLY). */ 1664 } 1665 if (head->r.w_pos || head->r.eof) 1666 return; 1667 head->r.eof = true; 1668 if (tomoyo_str_starts(&buf, "global-pid ")) 1669 global_pid = true; 1670 pid = (unsigned int) simple_strtoul(buf, NULL, 10); 1671 rcu_read_lock(); 1672 if (global_pid) 1673 p = find_task_by_pid_ns(pid, &init_pid_ns); 1674 else 1675 p = find_task_by_vpid(pid); 1676 if (p) 1677 domain = tomoyo_real_domain(p); 1678 rcu_read_unlock(); 1679 if (!domain) 1680 return; 1681 tomoyo_io_printf(head, "%u %u ", pid, domain->profile); 1682 tomoyo_set_string(head, domain->domainname->name); 1683} 1684 1685/* String table for domain transition control keywords. */ 1686static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = { 1687 [TOMOYO_TRANSITION_CONTROL_NO_RESET] = "no_reset_domain ", 1688 [TOMOYO_TRANSITION_CONTROL_RESET] = "reset_domain ", 1689 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ", 1690 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ", 1691 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ", 1692 [TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain ", 1693}; 1694 1695/* String table for grouping keywords. */ 1696static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = { 1697 [TOMOYO_PATH_GROUP] = "path_group ", 1698 [TOMOYO_NUMBER_GROUP] = "number_group ", 1699 [TOMOYO_ADDRESS_GROUP] = "address_group ", 1700}; 1701 1702/** 1703 * tomoyo_write_exception - Write exception policy. 1704 * 1705 * @head: Pointer to "struct tomoyo_io_buffer". 1706 * 1707 * Returns 0 on success, negative value otherwise. 1708 * 1709 * Caller holds tomoyo_read_lock(). 1710 */ 1711static int tomoyo_write_exception(struct tomoyo_io_buffer *head) 1712{ 1713 const bool is_delete = head->w.is_delete; 1714 struct tomoyo_acl_param param = { 1715 .ns = head->w.ns, 1716 .is_delete = is_delete, 1717 .data = head->write_buf, 1718 }; 1719 u8 i; 1720 if (tomoyo_str_starts(¶m.data, "aggregator ")) 1721 return tomoyo_write_aggregator(¶m); 1722 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++) 1723 if (tomoyo_str_starts(¶m.data, tomoyo_transition_type[i])) 1724 return tomoyo_write_transition_control(¶m, i); 1725 for (i = 0; i < TOMOYO_MAX_GROUP; i++) 1726 if (tomoyo_str_starts(¶m.data, tomoyo_group_name[i])) 1727 return tomoyo_write_group(¶m, i); 1728 if (tomoyo_str_starts(¶m.data, "acl_group ")) { 1729 unsigned int group; 1730 char *data; 1731 group = simple_strtoul(param.data, &data, 10); 1732 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ') 1733 return tomoyo_write_domain2 1734 (head->w.ns, &head->w.ns->acl_group[group], 1735 data, is_delete); 1736 } 1737 return -EINVAL; 1738} 1739 1740/** 1741 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list. 1742 * 1743 * @head: Pointer to "struct tomoyo_io_buffer". 1744 * @idx: Index number. 1745 * 1746 * Returns true on success, false otherwise. 1747 * 1748 * Caller holds tomoyo_read_lock(). 1749 */ 1750static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx) 1751{ 1752 struct tomoyo_policy_namespace *ns = 1753 container_of(head->r.ns, typeof(*ns), namespace_list); 1754 struct list_head *list = &ns->group_list[idx]; 1755 list_for_each_cookie(head->r.group, list) { 1756 struct tomoyo_group *group = 1757 list_entry(head->r.group, typeof(*group), head.list); 1758 list_for_each_cookie(head->r.acl, &group->member_list) { 1759 struct tomoyo_acl_head *ptr = 1760 list_entry(head->r.acl, typeof(*ptr), list); 1761 if (ptr->is_deleted) 1762 continue; 1763 if (!tomoyo_flush(head)) 1764 return false; 1765 tomoyo_print_namespace(head); 1766 tomoyo_set_string(head, tomoyo_group_name[idx]); 1767 tomoyo_set_string(head, group->group_name->name); 1768 if (idx == TOMOYO_PATH_GROUP) { 1769 tomoyo_set_space(head); 1770 tomoyo_set_string(head, container_of 1771 (ptr, struct tomoyo_path_group, 1772 head)->member_name->name); 1773 } else if (idx == TOMOYO_NUMBER_GROUP) { 1774 tomoyo_print_number_union(head, &container_of 1775 (ptr, 1776 struct tomoyo_number_group, 1777 head)->number); 1778 } else if (idx == TOMOYO_ADDRESS_GROUP) { 1779 char buffer[128]; 1780 1781 struct tomoyo_address_group *member = 1782 container_of(ptr, typeof(*member), 1783 head); 1784 tomoyo_print_ip(buffer, sizeof(buffer), 1785 &member->address); 1786 tomoyo_io_printf(head, " %s", buffer); 1787 } 1788 tomoyo_set_lf(head); 1789 } 1790 head->r.acl = NULL; 1791 } 1792 head->r.group = NULL; 1793 return true; 1794} 1795 1796/** 1797 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list. 1798 * 1799 * @head: Pointer to "struct tomoyo_io_buffer". 1800 * @idx: Index number. 1801 * 1802 * Returns true on success, false otherwise. 1803 * 1804 * Caller holds tomoyo_read_lock(). 1805 */ 1806static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx) 1807{ 1808 struct tomoyo_policy_namespace *ns = 1809 container_of(head->r.ns, typeof(*ns), namespace_list); 1810 struct list_head *list = &ns->policy_list[idx]; 1811 list_for_each_cookie(head->r.acl, list) { 1812 struct tomoyo_acl_head *acl = 1813 container_of(head->r.acl, typeof(*acl), list); 1814 if (acl->is_deleted) 1815 continue; 1816 if (!tomoyo_flush(head)) 1817 return false; 1818 switch (idx) { 1819 case TOMOYO_ID_TRANSITION_CONTROL: 1820 { 1821 struct tomoyo_transition_control *ptr = 1822 container_of(acl, typeof(*ptr), head); 1823 tomoyo_print_namespace(head); 1824 tomoyo_set_string(head, tomoyo_transition_type 1825 [ptr->type]); 1826 tomoyo_set_string(head, ptr->program ? 1827 ptr->program->name : "any"); 1828 tomoyo_set_string(head, " from "); 1829 tomoyo_set_string(head, ptr->domainname ? 1830 ptr->domainname->name : 1831 "any"); 1832 } 1833 break; 1834 case TOMOYO_ID_AGGREGATOR: 1835 { 1836 struct tomoyo_aggregator *ptr = 1837 container_of(acl, typeof(*ptr), head); 1838 tomoyo_print_namespace(head); 1839 tomoyo_set_string(head, "aggregator "); 1840 tomoyo_set_string(head, 1841 ptr->original_name->name); 1842 tomoyo_set_space(head); 1843 tomoyo_set_string(head, 1844 ptr->aggregated_name->name); 1845 } 1846 break; 1847 default: 1848 continue; 1849 } 1850 tomoyo_set_lf(head); 1851 } 1852 head->r.acl = NULL; 1853 return true; 1854} 1855 1856/** 1857 * tomoyo_read_exception - Read exception policy. 1858 * 1859 * @head: Pointer to "struct tomoyo_io_buffer". 1860 * 1861 * Caller holds tomoyo_read_lock(). 1862 */ 1863static void tomoyo_read_exception(struct tomoyo_io_buffer *head) 1864{ 1865 struct tomoyo_policy_namespace *ns = 1866 container_of(head->r.ns, typeof(*ns), namespace_list); 1867 if (head->r.eof) 1868 return; 1869 while (head->r.step < TOMOYO_MAX_POLICY && 1870 tomoyo_read_policy(head, head->r.step)) 1871 head->r.step++; 1872 if (head->r.step < TOMOYO_MAX_POLICY) 1873 return; 1874 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP && 1875 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY)) 1876 head->r.step++; 1877 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP) 1878 return; 1879 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP 1880 + TOMOYO_MAX_ACL_GROUPS) { 1881 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY 1882 - TOMOYO_MAX_GROUP; 1883 if (!tomoyo_read_domain2(head, &ns->acl_group 1884 [head->r.acl_group_index])) 1885 return; 1886 head->r.step++; 1887 } 1888 head->r.eof = true; 1889} 1890 1891/* Wait queue for kernel -> userspace notification. */ 1892static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait); 1893/* Wait queue for userspace -> kernel notification. */ 1894static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait); 1895 1896/* Structure for query. */ 1897struct tomoyo_query { 1898 struct list_head list; 1899 struct tomoyo_domain_info *domain; 1900 char *query; 1901 size_t query_len; 1902 unsigned int serial; 1903 u8 timer; 1904 u8 answer; 1905 u8 retry; 1906}; 1907 1908/* The list for "struct tomoyo_query". */ 1909static LIST_HEAD(tomoyo_query_list); 1910 1911/* Lock for manipulating tomoyo_query_list. */ 1912static DEFINE_SPINLOCK(tomoyo_query_list_lock); 1913 1914/* 1915 * Number of "struct file" referring /sys/kernel/security/tomoyo/query 1916 * interface. 1917 */ 1918static atomic_t tomoyo_query_observers = ATOMIC_INIT(0); 1919 1920/** 1921 * tomoyo_truncate - Truncate a line. 1922 * 1923 * @str: String to truncate. 1924 * 1925 * Returns length of truncated @str. 1926 */ 1927static int tomoyo_truncate(char *str) 1928{ 1929 char *start = str; 1930 while (*(unsigned char *) str > (unsigned char) ' ') 1931 str++; 1932 *str = '\0'; 1933 return strlen(start) + 1; 1934} 1935 1936/** 1937 * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode. 1938 * 1939 * @domain: Pointer to "struct tomoyo_domain_info". 1940 * @header: Lines containing ACL. 1941 * 1942 * Returns nothing. 1943 */ 1944static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header) 1945{ 1946 char *buffer; 1947 char *realpath = NULL; 1948 char *argv0 = NULL; 1949 char *symlink = NULL; 1950 char *cp = strchr(header, '\n'); 1951 int len; 1952 if (!cp) 1953 return; 1954 cp = strchr(cp + 1, '\n'); 1955 if (!cp) 1956 return; 1957 *cp++ = '\0'; 1958 len = strlen(cp) + 1; 1959 /* strstr() will return NULL if ordering is wrong. */ 1960 if (*cp == 'f') { 1961 argv0 = strstr(header, " argv[]={ \""); 1962 if (argv0) { 1963 argv0 += 10; 1964 len += tomoyo_truncate(argv0) + 14; 1965 } 1966 realpath = strstr(header, " exec={ realpath=\""); 1967 if (realpath) { 1968 realpath += 8; 1969 len += tomoyo_truncate(realpath) + 6; 1970 } 1971 symlink = strstr(header, " symlink.target=\""); 1972 if (symlink) 1973 len += tomoyo_truncate(symlink + 1) + 1; 1974 } 1975 buffer = kmalloc(len, GFP_NOFS); 1976 if (!buffer) 1977 return; 1978 snprintf(buffer, len - 1, "%s", cp); 1979 if (realpath) 1980 tomoyo_addprintf(buffer, len, " exec.%s", realpath); 1981 if (argv0) 1982 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0); 1983 if (symlink) 1984 tomoyo_addprintf(buffer, len, "%s", symlink); 1985 tomoyo_normalize_line(buffer); 1986 if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer, 1987 false)) 1988 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES); 1989 kfree(buffer); 1990} 1991 1992/** 1993 * tomoyo_supervisor - Ask for the supervisor's decision. 1994 * 1995 * @r: Pointer to "struct tomoyo_request_info". 1996 * @fmt: The printf()'s format string, followed by parameters. 1997 * 1998 * Returns 0 if the supervisor decided to permit the access request which 1999 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the 2000 * supervisor decided to retry the access request which violated the policy in 2001 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise. 2002 */ 2003int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) 2004{ 2005 va_list args; 2006 int error; 2007 int len; 2008 static unsigned int tomoyo_serial; 2009 struct tomoyo_query entry = { }; 2010 bool quota_exceeded = false; 2011 va_start(args, fmt); 2012 len = vsnprintf((char *) &len, 1, fmt, args) + 1; 2013 va_end(args); 2014 /* Write /sys/kernel/security/tomoyo/audit. */ 2015 va_start(args, fmt); 2016 tomoyo_write_log2(r, len, fmt, args); 2017 va_end(args); 2018 /* Nothing more to do if granted. */ 2019 if (r->granted) 2020 return 0; 2021 if (r->mode) 2022 tomoyo_update_stat(r->mode); 2023 switch (r->mode) { 2024 case TOMOYO_CONFIG_ENFORCING: 2025 error = -EPERM; 2026 if (atomic_read(&tomoyo_query_observers)) 2027 break; 2028 goto out; 2029 case TOMOYO_CONFIG_LEARNING: 2030 error = 0; 2031 /* Check max_learning_entry parameter. */ 2032 if (tomoyo_domain_quota_is_ok(r)) 2033 break; 2034 /* fall through */ 2035 default: 2036 return 0; 2037 } 2038 /* Get message. */ 2039 va_start(args, fmt); 2040 entry.query = tomoyo_init_log(r, len, fmt, args); 2041 va_end(args); 2042 if (!entry.query) 2043 goto out; 2044 entry.query_len = strlen(entry.query) + 1; 2045 if (!error) { 2046 tomoyo_add_entry(r->domain, entry.query); 2047 goto out; 2048 } 2049 len = tomoyo_round2(entry.query_len); 2050 entry.domain = r->domain; 2051 spin_lock(&tomoyo_query_list_lock); 2052 if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] && 2053 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len 2054 >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) { 2055 quota_exceeded = true; 2056 } else { 2057 entry.serial = tomoyo_serial++; 2058 entry.retry = r->retry; 2059 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len; 2060 list_add_tail(&entry.list, &tomoyo_query_list); 2061 } 2062 spin_unlock(&tomoyo_query_list_lock); 2063 if (quota_exceeded) 2064 goto out; 2065 /* Give 10 seconds for supervisor's opinion. */ 2066 while (entry.timer < 10) { 2067 wake_up_all(&tomoyo_query_wait); 2068 if (wait_event_interruptible_timeout 2069 (tomoyo_answer_wait, entry.answer || 2070 !atomic_read(&tomoyo_query_observers), HZ)) 2071 break; 2072 else 2073 entry.timer++; 2074 } 2075 spin_lock(&tomoyo_query_list_lock); 2076 list_del(&entry.list); 2077 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len; 2078 spin_unlock(&tomoyo_query_list_lock); 2079 switch (entry.answer) { 2080 case 3: /* Asked to retry by administrator. */ 2081 error = TOMOYO_RETRY_REQUEST; 2082 r->retry++; 2083 break; 2084 case 1: 2085 /* Granted by administrator. */ 2086 error = 0; 2087 break; 2088 default: 2089 /* Timed out or rejected by administrator. */ 2090 break; 2091 } 2092out: 2093 kfree(entry.query); 2094 return error; 2095} 2096 2097/** 2098 * tomoyo_find_domain_by_qid - Get domain by query id. 2099 * 2100 * @serial: Query ID assigned by tomoyo_supervisor(). 2101 * 2102 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise. 2103 */ 2104static struct tomoyo_domain_info *tomoyo_find_domain_by_qid 2105(unsigned int serial) 2106{ 2107 struct tomoyo_query *ptr; 2108 struct tomoyo_domain_info *domain = NULL; 2109 spin_lock(&tomoyo_query_list_lock); 2110 list_for_each_entry(ptr, &tomoyo_query_list, list) { 2111 if (ptr->serial != serial || ptr->answer) 2112 continue; 2113 domain = ptr->domain; 2114 break; 2115 } 2116 spin_unlock(&tomoyo_query_list_lock); 2117 return domain; 2118} 2119 2120/** 2121 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query. 2122 * 2123 * @file: Pointer to "struct file". 2124 * @wait: Pointer to "poll_table". 2125 * 2126 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. 2127 * 2128 * Waits for access requests which violated policy in enforcing mode. 2129 */ 2130static int tomoyo_poll_query(struct file *file, poll_table *wait) 2131{ 2132 struct list_head *tmp; 2133 bool found = false; 2134 u8 i; 2135 for (i = 0; i < 2; i++) { 2136 spin_lock(&tomoyo_query_list_lock); 2137 list_for_each(tmp, &tomoyo_query_list) { 2138 struct tomoyo_query *ptr = 2139 list_entry(tmp, typeof(*ptr), list); 2140 if (ptr->answer) 2141 continue; 2142 found = true; 2143 break; 2144 } 2145 spin_unlock(&tomoyo_query_list_lock); 2146 if (found) 2147 return POLLIN | POLLRDNORM; 2148 if (i) 2149 break; 2150 poll_wait(file, &tomoyo_query_wait, wait); 2151 } 2152 return 0; 2153} 2154 2155/** 2156 * tomoyo_read_query - Read access requests which violated policy in enforcing mode. 2157 * 2158 * @head: Pointer to "struct tomoyo_io_buffer". 2159 */ 2160static void tomoyo_read_query(struct tomoyo_io_buffer *head) 2161{ 2162 struct list_head *tmp; 2163 unsigned int pos = 0; 2164 size_t len = 0; 2165 char *buf; 2166 if (head->r.w_pos) 2167 return; 2168 if (head->read_buf) { 2169 kfree(head->read_buf); 2170 head->read_buf = NULL; 2171 } 2172 spin_lock(&tomoyo_query_list_lock); 2173 list_for_each(tmp, &tomoyo_query_list) { 2174 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2175 if (ptr->answer) 2176 continue; 2177 if (pos++ != head->r.query_index) 2178 continue; 2179 len = ptr->query_len; 2180 break; 2181 } 2182 spin_unlock(&tomoyo_query_list_lock); 2183 if (!len) { 2184 head->r.query_index = 0; 2185 return; 2186 } 2187 buf = kzalloc(len + 32, GFP_NOFS); 2188 if (!buf) 2189 return; 2190 pos = 0; 2191 spin_lock(&tomoyo_query_list_lock); 2192 list_for_each(tmp, &tomoyo_query_list) { 2193 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2194 if (ptr->answer) 2195 continue; 2196 if (pos++ != head->r.query_index) 2197 continue; 2198 /* 2199 * Some query can be skipped because tomoyo_query_list 2200 * can change, but I don't care. 2201 */ 2202 if (len == ptr->query_len) 2203 snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial, 2204 ptr->retry, ptr->query); 2205 break; 2206 } 2207 spin_unlock(&tomoyo_query_list_lock); 2208 if (buf[0]) { 2209 head->read_buf = buf; 2210 head->r.w[head->r.w_pos++] = buf; 2211 head->r.query_index++; 2212 } else { 2213 kfree(buf); 2214 } 2215} 2216 2217/** 2218 * tomoyo_write_answer - Write the supervisor's decision. 2219 * 2220 * @head: Pointer to "struct tomoyo_io_buffer". 2221 * 2222 * Returns 0 on success, -EINVAL otherwise. 2223 */ 2224static int tomoyo_write_answer(struct tomoyo_io_buffer *head) 2225{ 2226 char *data = head->write_buf; 2227 struct list_head *tmp; 2228 unsigned int serial; 2229 unsigned int answer; 2230 spin_lock(&tomoyo_query_list_lock); 2231 list_for_each(tmp, &tomoyo_query_list) { 2232 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2233 ptr->timer = 0; 2234 } 2235 spin_unlock(&tomoyo_query_list_lock); 2236 if (sscanf(data, "A%u=%u", &serial, &answer) != 2) 2237 return -EINVAL; 2238 spin_lock(&tomoyo_query_list_lock); 2239 list_for_each(tmp, &tomoyo_query_list) { 2240 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); 2241 if (ptr->serial != serial) 2242 continue; 2243 if (!ptr->answer) 2244 ptr->answer = answer; 2245 break; 2246 } 2247 spin_unlock(&tomoyo_query_list_lock); 2248 return 0; 2249} 2250 2251/** 2252 * tomoyo_read_version: Get version. 2253 * 2254 * @head: Pointer to "struct tomoyo_io_buffer". 2255 * 2256 * Returns version information. 2257 */ 2258static void tomoyo_read_version(struct tomoyo_io_buffer *head) 2259{ 2260 if (!head->r.eof) { 2261 tomoyo_io_printf(head, "2.5.0"); 2262 head->r.eof = true; 2263 } 2264} 2265 2266/* String table for /sys/kernel/security/tomoyo/stat interface. */ 2267static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = { 2268 [TOMOYO_STAT_POLICY_UPDATES] = "update:", 2269 [TOMOYO_STAT_POLICY_LEARNING] = "violation in learning mode:", 2270 [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:", 2271 [TOMOYO_STAT_POLICY_ENFORCING] = "violation in enforcing mode:", 2272}; 2273 2274/* String table for /sys/kernel/security/tomoyo/stat interface. */ 2275static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = { 2276 [TOMOYO_MEMORY_POLICY] = "policy:", 2277 [TOMOYO_MEMORY_AUDIT] = "audit log:", 2278 [TOMOYO_MEMORY_QUERY] = "query message:", 2279}; 2280 2281/* Timestamp counter for last updated. */ 2282static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT]; 2283/* Counter for number of updates. */ 2284static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT]; 2285 2286/** 2287 * tomoyo_update_stat - Update statistic counters. 2288 * 2289 * @index: Index for policy type. 2290 * 2291 * Returns nothing. 2292 */ 2293void tomoyo_update_stat(const u8 index) 2294{ 2295 struct timeval tv; 2296 do_gettimeofday(&tv); 2297 /* 2298 * I don't use atomic operations because race condition is not fatal. 2299 */ 2300 tomoyo_stat_updated[index]++; 2301 tomoyo_stat_modified[index] = tv.tv_sec; 2302} 2303 2304/** 2305 * tomoyo_read_stat - Read statistic data. 2306 * 2307 * @head: Pointer to "struct tomoyo_io_buffer". 2308 * 2309 * Returns nothing. 2310 */ 2311static void tomoyo_read_stat(struct tomoyo_io_buffer *head) 2312{ 2313 u8 i; 2314 unsigned int total = 0; 2315 if (head->r.eof) 2316 return; 2317 for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) { 2318 tomoyo_io_printf(head, "Policy %-30s %10u", 2319 tomoyo_policy_headers[i], 2320 tomoyo_stat_updated[i]); 2321 if (tomoyo_stat_modified[i]) { 2322 struct tomoyo_time stamp; 2323 tomoyo_convert_time(tomoyo_stat_modified[i], &stamp); 2324 tomoyo_io_printf(head, " (Last: %04u/%02u/%02u " 2325 "%02u:%02u:%02u)", 2326 stamp.year, stamp.month, stamp.day, 2327 stamp.hour, stamp.min, stamp.sec); 2328 } 2329 tomoyo_set_lf(head); 2330 } 2331 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) { 2332 unsigned int used = tomoyo_memory_used[i]; 2333 total += used; 2334 tomoyo_io_printf(head, "Memory used by %-22s %10u", 2335 tomoyo_memory_headers[i], used); 2336 used = tomoyo_memory_quota[i]; 2337 if (used) 2338 tomoyo_io_printf(head, " (Quota: %10u)", used); 2339 tomoyo_set_lf(head); 2340 } 2341 tomoyo_io_printf(head, "Total memory used: %10u\n", 2342 total); 2343 head->r.eof = true; 2344} 2345 2346/** 2347 * tomoyo_write_stat - Set memory quota. 2348 * 2349 * @head: Pointer to "struct tomoyo_io_buffer". 2350 * 2351 * Returns 0. 2352 */ 2353static int tomoyo_write_stat(struct tomoyo_io_buffer *head) 2354{ 2355 char *data = head->write_buf; 2356 u8 i; 2357 if (tomoyo_str_starts(&data, "Memory used by ")) 2358 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) 2359 if (tomoyo_str_starts(&data, tomoyo_memory_headers[i])) 2360 sscanf(data, "%u", &tomoyo_memory_quota[i]); 2361 return 0; 2362} 2363 2364/** 2365 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. 2366 * 2367 * @type: Type of interface. 2368 * @file: Pointer to "struct file". 2369 * 2370 * Returns 0 on success, negative value otherwise. 2371 */ 2372int tomoyo_open_control(const u8 type, struct file *file) 2373{ 2374 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS); 2375 2376 if (!head) 2377 return -ENOMEM; 2378 mutex_init(&head->io_sem); 2379 head->type = type; 2380 switch (type) { 2381 case TOMOYO_DOMAINPOLICY: 2382 /* /sys/kernel/security/tomoyo/domain_policy */ 2383 head->write = tomoyo_write_domain; 2384 head->read = tomoyo_read_domain; 2385 break; 2386 case TOMOYO_EXCEPTIONPOLICY: 2387 /* /sys/kernel/security/tomoyo/exception_policy */ 2388 head->write = tomoyo_write_exception; 2389 head->read = tomoyo_read_exception; 2390 break; 2391 case TOMOYO_AUDIT: 2392 /* /sys/kernel/security/tomoyo/audit */ 2393 head->poll = tomoyo_poll_log; 2394 head->read = tomoyo_read_log; 2395 break; 2396 case TOMOYO_PROCESS_STATUS: 2397 /* /sys/kernel/security/tomoyo/.process_status */ 2398 head->write = tomoyo_write_pid; 2399 head->read = tomoyo_read_pid; 2400 break; 2401 case TOMOYO_VERSION: 2402 /* /sys/kernel/security/tomoyo/version */ 2403 head->read = tomoyo_read_version; 2404 head->readbuf_size = 128; 2405 break; 2406 case TOMOYO_STAT: 2407 /* /sys/kernel/security/tomoyo/stat */ 2408 head->write = tomoyo_write_stat; 2409 head->read = tomoyo_read_stat; 2410 head->readbuf_size = 1024; 2411 break; 2412 case TOMOYO_PROFILE: 2413 /* /sys/kernel/security/tomoyo/profile */ 2414 head->write = tomoyo_write_profile; 2415 head->read = tomoyo_read_profile; 2416 break; 2417 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */ 2418 head->poll = tomoyo_poll_query; 2419 head->write = tomoyo_write_answer; 2420 head->read = tomoyo_read_query; 2421 break; 2422 case TOMOYO_MANAGER: 2423 /* /sys/kernel/security/tomoyo/manager */ 2424 head->write = tomoyo_write_manager; 2425 head->read = tomoyo_read_manager; 2426 break; 2427 } 2428 if (!(file->f_mode & FMODE_READ)) { 2429 /* 2430 * No need to allocate read_buf since it is not opened 2431 * for reading. 2432 */ 2433 head->read = NULL; 2434 head->poll = NULL; 2435 } else if (!head->poll) { 2436 /* Don't allocate read_buf for poll() access. */ 2437 if (!head->readbuf_size) 2438 head->readbuf_size = 4096 * 2; 2439 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS); 2440 if (!head->read_buf) { 2441 kfree(head); 2442 return -ENOMEM; 2443 } 2444 } 2445 if (!(file->f_mode & FMODE_WRITE)) { 2446 /* 2447 * No need to allocate write_buf since it is not opened 2448 * for writing. 2449 */ 2450 head->write = NULL; 2451 } else if (head->write) { 2452 head->writebuf_size = 4096 * 2; 2453 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS); 2454 if (!head->write_buf) { 2455 kfree(head->read_buf); 2456 kfree(head); 2457 return -ENOMEM; 2458 } 2459 } 2460 /* 2461 * If the file is /sys/kernel/security/tomoyo/query , increment the 2462 * observer counter. 2463 * The obserber counter is used by tomoyo_supervisor() to see if 2464 * there is some process monitoring /sys/kernel/security/tomoyo/query. 2465 */ 2466 if (type == TOMOYO_QUERY) 2467 atomic_inc(&tomoyo_query_observers); 2468 file->private_data = head; 2469 tomoyo_notify_gc(head, true); 2470 return 0; 2471} 2472 2473/** 2474 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface. 2475 * 2476 * @file: Pointer to "struct file". 2477 * @wait: Pointer to "poll_table". 2478 * 2479 * Waits for read readiness. 2480 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and 2481 * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd. 2482 */ 2483int tomoyo_poll_control(struct file *file, poll_table *wait) 2484{ 2485 struct tomoyo_io_buffer *head = file->private_data; 2486 if (!head->poll) 2487 return -ENOSYS; 2488 return head->poll(file, wait); 2489} 2490 2491/** 2492 * tomoyo_set_namespace_cursor - Set namespace to read. 2493 * 2494 * @head: Pointer to "struct tomoyo_io_buffer". 2495 * 2496 * Returns nothing. 2497 */ 2498static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head) 2499{ 2500 struct list_head *ns; 2501 if (head->type != TOMOYO_EXCEPTIONPOLICY && 2502 head->type != TOMOYO_PROFILE) 2503 return; 2504 /* 2505 * If this is the first read, or reading previous namespace finished 2506 * and has more namespaces to read, update the namespace cursor. 2507 */ 2508 ns = head->r.ns; 2509 if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) { 2510 /* Clearing is OK because tomoyo_flush() returned true. */ 2511 memset(&head->r, 0, sizeof(head->r)); 2512 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next; 2513 } 2514} 2515 2516/** 2517 * tomoyo_has_more_namespace - Check for unread namespaces. 2518 * 2519 * @head: Pointer to "struct tomoyo_io_buffer". 2520 * 2521 * Returns true if we have more entries to print, false otherwise. 2522 */ 2523static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head) 2524{ 2525 return (head->type == TOMOYO_EXCEPTIONPOLICY || 2526 head->type == TOMOYO_PROFILE) && head->r.eof && 2527 head->r.ns->next != &tomoyo_namespace_list; 2528} 2529 2530/** 2531 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. 2532 * 2533 * @head: Pointer to "struct tomoyo_io_buffer". 2534 * @buffer: Poiner to buffer to write to. 2535 * @buffer_len: Size of @buffer. 2536 * 2537 * Returns bytes read on success, negative value otherwise. 2538 */ 2539ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer, 2540 const int buffer_len) 2541{ 2542 int len; 2543 int idx; 2544 2545 if (!head->read) 2546 return -ENOSYS; 2547 if (mutex_lock_interruptible(&head->io_sem)) 2548 return -EINTR; 2549 head->read_user_buf = buffer; 2550 head->read_user_buf_avail = buffer_len; 2551 idx = tomoyo_read_lock(); 2552 if (tomoyo_flush(head)) 2553 /* Call the policy handler. */ 2554 do { 2555 tomoyo_set_namespace_cursor(head); 2556 head->read(head); 2557 } while (tomoyo_flush(head) && 2558 tomoyo_has_more_namespace(head)); 2559 tomoyo_read_unlock(idx); 2560 len = head->read_user_buf - buffer; 2561 mutex_unlock(&head->io_sem); 2562 return len; 2563} 2564 2565/** 2566 * tomoyo_parse_policy - Parse a policy line. 2567 * 2568 * @head: Poiter to "struct tomoyo_io_buffer". 2569 * @line: Line to parse. 2570 * 2571 * Returns 0 on success, negative value otherwise. 2572 * 2573 * Caller holds tomoyo_read_lock(). 2574 */ 2575static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line) 2576{ 2577 /* Delete request? */ 2578 head->w.is_delete = !strncmp(line, "delete ", 7); 2579 if (head->w.is_delete) 2580 memmove(line, line + 7, strlen(line + 7) + 1); 2581 /* Selecting namespace to update. */ 2582 if (head->type == TOMOYO_EXCEPTIONPOLICY || 2583 head->type == TOMOYO_PROFILE) { 2584 if (*line == '<') { 2585 char *cp = strchr(line, ' '); 2586 if (cp) { 2587 *cp++ = '\0'; 2588 head->w.ns = tomoyo_assign_namespace(line); 2589 memmove(line, cp, strlen(cp) + 1); 2590 } else 2591 head->w.ns = NULL; 2592 } else 2593 head->w.ns = &tomoyo_kernel_namespace; 2594 /* Don't allow updating if namespace is invalid. */ 2595 if (!head->w.ns) 2596 return -ENOENT; 2597 } 2598 /* Do the update. */ 2599 return head->write(head); 2600} 2601 2602/** 2603 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. 2604 * 2605 * @head: Pointer to "struct tomoyo_io_buffer". 2606 * @buffer: Pointer to buffer to read from. 2607 * @buffer_len: Size of @buffer. 2608 * 2609 * Returns @buffer_len on success, negative value otherwise. 2610 */ 2611ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head, 2612 const char __user *buffer, const int buffer_len) 2613{ 2614 int error = buffer_len; 2615 size_t avail_len = buffer_len; 2616 char *cp0 = head->write_buf; 2617 int idx; 2618 if (!head->write) 2619 return -ENOSYS; 2620 if (!access_ok(VERIFY_READ, buffer, buffer_len)) 2621 return -EFAULT; 2622 if (mutex_lock_interruptible(&head->io_sem)) 2623 return -EINTR; 2624 head->read_user_buf_avail = 0; 2625 idx = tomoyo_read_lock(); 2626 /* Read a line and dispatch it to the policy handler. */ 2627 while (avail_len > 0) { 2628 char c; 2629 if (head->w.avail >= head->writebuf_size - 1) { 2630 const int len = head->writebuf_size * 2; 2631 char *cp = kzalloc(len, GFP_NOFS); 2632 if (!cp) { 2633 error = -ENOMEM; 2634 break; 2635 } 2636 memmove(cp, cp0, head->w.avail); 2637 kfree(cp0); 2638 head->write_buf = cp; 2639 cp0 = cp; 2640 head->writebuf_size = len; 2641 } 2642 if (get_user(c, buffer)) { 2643 error = -EFAULT; 2644 break; 2645 } 2646 buffer++; 2647 avail_len--; 2648 cp0[head->w.avail++] = c; 2649 if (c != '\n') 2650 continue; 2651 cp0[head->w.avail - 1] = '\0'; 2652 head->w.avail = 0; 2653 tomoyo_normalize_line(cp0); 2654 if (!strcmp(cp0, "reset")) { 2655 head->w.ns = &tomoyo_kernel_namespace; 2656 head->w.domain = NULL; 2657 memset(&head->r, 0, sizeof(head->r)); 2658 continue; 2659 } 2660 /* Don't allow updating policies by non manager programs. */ 2661 switch (head->type) { 2662 case TOMOYO_PROCESS_STATUS: 2663 /* This does not write anything. */ 2664 break; 2665 case TOMOYO_DOMAINPOLICY: 2666 if (tomoyo_select_domain(head, cp0)) 2667 continue; 2668 /* fall through */ 2669 case TOMOYO_EXCEPTIONPOLICY: 2670 if (!strcmp(cp0, "select transition_only")) { 2671 head->r.print_transition_related_only = true; 2672 continue; 2673 } 2674 /* fall through */ 2675 default: 2676 if (!tomoyo_manager()) { 2677 error = -EPERM; 2678 goto out; 2679 } 2680 } 2681 switch (tomoyo_parse_policy(head, cp0)) { 2682 case -EPERM: 2683 error = -EPERM; 2684 goto out; 2685 case 0: 2686 switch (head->type) { 2687 case TOMOYO_DOMAINPOLICY: 2688 case TOMOYO_EXCEPTIONPOLICY: 2689 case TOMOYO_STAT: 2690 case TOMOYO_PROFILE: 2691 case TOMOYO_MANAGER: 2692 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES); 2693 break; 2694 default: 2695 break; 2696 } 2697 break; 2698 } 2699 } 2700out: 2701 tomoyo_read_unlock(idx); 2702 mutex_unlock(&head->io_sem); 2703 return error; 2704} 2705 2706/** 2707 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. 2708 * 2709 * @head: Pointer to "struct tomoyo_io_buffer". 2710 * 2711 * Returns 0. 2712 */ 2713int tomoyo_close_control(struct tomoyo_io_buffer *head) 2714{ 2715 /* 2716 * If the file is /sys/kernel/security/tomoyo/query , decrement the 2717 * observer counter. 2718 */ 2719 if (head->type == TOMOYO_QUERY && 2720 atomic_dec_and_test(&tomoyo_query_observers)) 2721 wake_up_all(&tomoyo_answer_wait); 2722 tomoyo_notify_gc(head, false); 2723 return 0; 2724} 2725 2726/** 2727 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined. 2728 */ 2729void tomoyo_check_profile(void) 2730{ 2731 struct tomoyo_domain_info *domain; 2732 const int idx = tomoyo_read_lock(); 2733 tomoyo_policy_loaded = true; 2734 printk(KERN_INFO "TOMOYO: 2.5.0\n"); 2735 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 2736 const u8 profile = domain->profile; 2737 const struct tomoyo_policy_namespace *ns = domain->ns; 2738 if (ns->profile_version != 20110903) 2739 printk(KERN_ERR 2740 "Profile version %u is not supported.\n", 2741 ns->profile_version); 2742 else if (!ns->profile_ptr[profile]) 2743 printk(KERN_ERR 2744 "Profile %u (used by '%s') is not defined.\n", 2745 profile, domain->domainname->name); 2746 else 2747 continue; 2748 printk(KERN_ERR 2749 "Userland tools for TOMOYO 2.5 must be installed and " 2750 "policy must be initialized.\n"); 2751 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ " 2752 "for more information.\n"); 2753 panic("STOP!"); 2754 } 2755 tomoyo_read_unlock(idx); 2756 printk(KERN_INFO "Mandatory Access Control activated.\n"); 2757} 2758 2759/** 2760 * tomoyo_load_builtin_policy - Load built-in policy. 2761 * 2762 * Returns nothing. 2763 */ 2764void __init tomoyo_load_builtin_policy(void) 2765{ 2766 /* 2767 * This include file is manually created and contains built-in policy 2768 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy", 2769 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager", 2770 * "tomoyo_builtin_stat" in the form of "static char [] __initdata". 2771 */ 2772#include "builtin-policy.h" 2773 u8 i; 2774 const int idx = tomoyo_read_lock(); 2775 for (i = 0; i < 5; i++) { 2776 struct tomoyo_io_buffer head = { }; 2777 char *start = ""; 2778 switch (i) { 2779 case 0: 2780 start = tomoyo_builtin_profile; 2781 head.type = TOMOYO_PROFILE; 2782 head.write = tomoyo_write_profile; 2783 break; 2784 case 1: 2785 start = tomoyo_builtin_exception_policy; 2786 head.type = TOMOYO_EXCEPTIONPOLICY; 2787 head.write = tomoyo_write_exception; 2788 break; 2789 case 2: 2790 start = tomoyo_builtin_domain_policy; 2791 head.type = TOMOYO_DOMAINPOLICY; 2792 head.write = tomoyo_write_domain; 2793 break; 2794 case 3: 2795 start = tomoyo_builtin_manager; 2796 head.type = TOMOYO_MANAGER; 2797 head.write = tomoyo_write_manager; 2798 break; 2799 case 4: 2800 start = tomoyo_builtin_stat; 2801 head.type = TOMOYO_STAT; 2802 head.write = tomoyo_write_stat; 2803 break; 2804 } 2805 while (1) { 2806 char *end = strchr(start, '\n'); 2807 if (!end) 2808 break; 2809 *end = '\0'; 2810 tomoyo_normalize_line(start); 2811 head.write_buf = start; 2812 tomoyo_parse_policy(&head, start); 2813 start = end + 1; 2814 } 2815 } 2816 tomoyo_read_unlock(idx); 2817#ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER 2818 tomoyo_check_profile(); 2819#endif 2820} 2821