common.h revision 0617c7ff34dc9b1d641640c3953274bb2dbe21a6
1/* 2 * security/tomoyo/common.h 3 * 4 * Header file for TOMOYO. 5 * 6 * Copyright (C) 2005-2010 NTT DATA CORPORATION 7 */ 8 9#ifndef _SECURITY_TOMOYO_COMMON_H 10#define _SECURITY_TOMOYO_COMMON_H 11 12#include <linux/ctype.h> 13#include <linux/string.h> 14#include <linux/mm.h> 15#include <linux/file.h> 16#include <linux/kmod.h> 17#include <linux/fs.h> 18#include <linux/sched.h> 19#include <linux/namei.h> 20#include <linux/mount.h> 21#include <linux/list.h> 22#include <linux/cred.h> 23#include <linux/poll.h> 24struct linux_binprm; 25 26/********** Constants definitions. **********/ 27 28/* 29 * TOMOYO uses this hash only when appending a string into the string 30 * table. Frequency of appending strings is very low. So we don't need 31 * large (e.g. 64k) hash size. 256 will be sufficient. 32 */ 33#define TOMOYO_HASH_BITS 8 34#define TOMOYO_MAX_HASH (1u<<TOMOYO_HASH_BITS) 35 36#define TOMOYO_EXEC_TMPSIZE 4096 37 38/* Profile number is an integer between 0 and 255. */ 39#define TOMOYO_MAX_PROFILES 256 40 41enum tomoyo_mode_index { 42 TOMOYO_CONFIG_DISABLED, 43 TOMOYO_CONFIG_LEARNING, 44 TOMOYO_CONFIG_PERMISSIVE, 45 TOMOYO_CONFIG_ENFORCING, 46 TOMOYO_CONFIG_USE_DEFAULT = 255 47}; 48 49enum tomoyo_policy_id { 50 TOMOYO_ID_GROUP, 51 TOMOYO_ID_PATH_GROUP, 52 TOMOYO_ID_NUMBER_GROUP, 53 TOMOYO_ID_DOMAIN_INITIALIZER, 54 TOMOYO_ID_DOMAIN_KEEPER, 55 TOMOYO_ID_AGGREGATOR, 56 TOMOYO_ID_GLOBALLY_READABLE, 57 TOMOYO_ID_PATTERN, 58 TOMOYO_ID_NO_REWRITE, 59 TOMOYO_ID_MANAGER, 60 TOMOYO_ID_NAME, 61 TOMOYO_ID_ACL, 62 TOMOYO_ID_DOMAIN, 63 TOMOYO_MAX_POLICY 64}; 65 66enum tomoyo_group_id { 67 TOMOYO_PATH_GROUP, 68 TOMOYO_NUMBER_GROUP, 69 TOMOYO_MAX_GROUP 70}; 71 72/* Keywords for ACLs. */ 73#define TOMOYO_KEYWORD_AGGREGATOR "aggregator " 74#define TOMOYO_KEYWORD_ALLOW_MOUNT "allow_mount " 75#define TOMOYO_KEYWORD_ALLOW_READ "allow_read " 76#define TOMOYO_KEYWORD_DELETE "delete " 77#define TOMOYO_KEYWORD_DENY_REWRITE "deny_rewrite " 78#define TOMOYO_KEYWORD_FILE_PATTERN "file_pattern " 79#define TOMOYO_KEYWORD_INITIALIZE_DOMAIN "initialize_domain " 80#define TOMOYO_KEYWORD_KEEP_DOMAIN "keep_domain " 81#define TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN "no_initialize_domain " 82#define TOMOYO_KEYWORD_NO_KEEP_DOMAIN "no_keep_domain " 83#define TOMOYO_KEYWORD_PATH_GROUP "path_group " 84#define TOMOYO_KEYWORD_NUMBER_GROUP "number_group " 85#define TOMOYO_KEYWORD_SELECT "select " 86#define TOMOYO_KEYWORD_USE_PROFILE "use_profile " 87#define TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "ignore_global_allow_read" 88#define TOMOYO_KEYWORD_QUOTA_EXCEEDED "quota_exceeded" 89#define TOMOYO_KEYWORD_TRANSITION_FAILED "transition_failed" 90/* A domain definition starts with <kernel>. */ 91#define TOMOYO_ROOT_NAME "<kernel>" 92#define TOMOYO_ROOT_NAME_LEN (sizeof(TOMOYO_ROOT_NAME) - 1) 93 94/* Value type definition. */ 95#define TOMOYO_VALUE_TYPE_INVALID 0 96#define TOMOYO_VALUE_TYPE_DECIMAL 1 97#define TOMOYO_VALUE_TYPE_OCTAL 2 98#define TOMOYO_VALUE_TYPE_HEXADECIMAL 3 99 100/* Index numbers for Access Controls. */ 101enum tomoyo_acl_entry_type_index { 102 TOMOYO_TYPE_PATH_ACL, 103 TOMOYO_TYPE_PATH2_ACL, 104 TOMOYO_TYPE_PATH_NUMBER_ACL, 105 TOMOYO_TYPE_MKDEV_ACL, 106 TOMOYO_TYPE_MOUNT_ACL, 107}; 108 109/* Index numbers for File Controls. */ 110 111/* 112 * TOMOYO_TYPE_READ_WRITE is special. TOMOYO_TYPE_READ_WRITE is automatically 113 * set if both TOMOYO_TYPE_READ and TOMOYO_TYPE_WRITE are set. 114 * Both TOMOYO_TYPE_READ and TOMOYO_TYPE_WRITE are automatically set if 115 * TOMOYO_TYPE_READ_WRITE is set. 116 * TOMOYO_TYPE_READ_WRITE is automatically cleared if either TOMOYO_TYPE_READ 117 * or TOMOYO_TYPE_WRITE is cleared. 118 * Both TOMOYO_TYPE_READ and TOMOYO_TYPE_WRITE are automatically cleared if 119 * TOMOYO_TYPE_READ_WRITE is cleared. 120 */ 121 122enum tomoyo_path_acl_index { 123 TOMOYO_TYPE_READ_WRITE, 124 TOMOYO_TYPE_EXECUTE, 125 TOMOYO_TYPE_READ, 126 TOMOYO_TYPE_WRITE, 127 TOMOYO_TYPE_UNLINK, 128 TOMOYO_TYPE_RMDIR, 129 TOMOYO_TYPE_TRUNCATE, 130 TOMOYO_TYPE_SYMLINK, 131 TOMOYO_TYPE_REWRITE, 132 TOMOYO_TYPE_CHROOT, 133 TOMOYO_TYPE_UMOUNT, 134 TOMOYO_MAX_PATH_OPERATION 135}; 136 137#define TOMOYO_RW_MASK ((1 << TOMOYO_TYPE_READ) | (1 << TOMOYO_TYPE_WRITE)) 138 139enum tomoyo_mkdev_acl_index { 140 TOMOYO_TYPE_MKBLOCK, 141 TOMOYO_TYPE_MKCHAR, 142 TOMOYO_MAX_MKDEV_OPERATION 143}; 144 145enum tomoyo_path2_acl_index { 146 TOMOYO_TYPE_LINK, 147 TOMOYO_TYPE_RENAME, 148 TOMOYO_TYPE_PIVOT_ROOT, 149 TOMOYO_MAX_PATH2_OPERATION 150}; 151 152enum tomoyo_path_number_acl_index { 153 TOMOYO_TYPE_CREATE, 154 TOMOYO_TYPE_MKDIR, 155 TOMOYO_TYPE_MKFIFO, 156 TOMOYO_TYPE_MKSOCK, 157 TOMOYO_TYPE_IOCTL, 158 TOMOYO_TYPE_CHMOD, 159 TOMOYO_TYPE_CHOWN, 160 TOMOYO_TYPE_CHGRP, 161 TOMOYO_MAX_PATH_NUMBER_OPERATION 162}; 163 164enum tomoyo_securityfs_interface_index { 165 TOMOYO_DOMAINPOLICY, 166 TOMOYO_EXCEPTIONPOLICY, 167 TOMOYO_DOMAIN_STATUS, 168 TOMOYO_PROCESS_STATUS, 169 TOMOYO_MEMINFO, 170 TOMOYO_SELFDOMAIN, 171 TOMOYO_VERSION, 172 TOMOYO_PROFILE, 173 TOMOYO_QUERY, 174 TOMOYO_MANAGER 175}; 176 177enum tomoyo_mac_index { 178 TOMOYO_MAC_FILE_EXECUTE, 179 TOMOYO_MAC_FILE_OPEN, 180 TOMOYO_MAC_FILE_CREATE, 181 TOMOYO_MAC_FILE_UNLINK, 182 TOMOYO_MAC_FILE_MKDIR, 183 TOMOYO_MAC_FILE_RMDIR, 184 TOMOYO_MAC_FILE_MKFIFO, 185 TOMOYO_MAC_FILE_MKSOCK, 186 TOMOYO_MAC_FILE_TRUNCATE, 187 TOMOYO_MAC_FILE_SYMLINK, 188 TOMOYO_MAC_FILE_REWRITE, 189 TOMOYO_MAC_FILE_MKBLOCK, 190 TOMOYO_MAC_FILE_MKCHAR, 191 TOMOYO_MAC_FILE_LINK, 192 TOMOYO_MAC_FILE_RENAME, 193 TOMOYO_MAC_FILE_CHMOD, 194 TOMOYO_MAC_FILE_CHOWN, 195 TOMOYO_MAC_FILE_CHGRP, 196 TOMOYO_MAC_FILE_IOCTL, 197 TOMOYO_MAC_FILE_CHROOT, 198 TOMOYO_MAC_FILE_MOUNT, 199 TOMOYO_MAC_FILE_UMOUNT, 200 TOMOYO_MAC_FILE_PIVOT_ROOT, 201 TOMOYO_MAX_MAC_INDEX 202}; 203 204enum tomoyo_mac_category_index { 205 TOMOYO_MAC_CATEGORY_FILE, 206 TOMOYO_MAX_MAC_CATEGORY_INDEX 207}; 208 209#define TOMOYO_RETRY_REQUEST 1 /* Retry this request. */ 210 211/********** Structure definitions. **********/ 212 213/* 214 * tomoyo_acl_head is a structure which is used for holding elements not in 215 * domain policy. 216 * It has following fields. 217 * 218 * (1) "list" which is linked to tomoyo_policy_list[] . 219 * (2) "is_deleted" is a bool which is true if marked as deleted, false 220 * otherwise. 221 */ 222struct tomoyo_acl_head { 223 struct list_head list; 224 bool is_deleted; 225} __packed; 226 227/* 228 * tomoyo_request_info is a structure which is used for holding 229 * 230 * (1) Domain information of current process. 231 * (2) How many retries are made for this request. 232 * (3) Profile number used for this request. 233 * (4) Access control mode of the profile. 234 */ 235struct tomoyo_request_info { 236 struct tomoyo_domain_info *domain; 237 /* For holding parameters. */ 238 union { 239 struct { 240 const struct tomoyo_path_info *filename; 241 u8 operation; 242 } path; 243 struct { 244 const struct tomoyo_path_info *filename1; 245 const struct tomoyo_path_info *filename2; 246 u8 operation; 247 } path2; 248 struct { 249 const struct tomoyo_path_info *filename; 250 unsigned int mode; 251 unsigned int major; 252 unsigned int minor; 253 u8 operation; 254 } mkdev; 255 struct { 256 const struct tomoyo_path_info *filename; 257 unsigned long number; 258 u8 operation; 259 } path_number; 260 struct { 261 const struct tomoyo_path_info *type; 262 const struct tomoyo_path_info *dir; 263 const struct tomoyo_path_info *dev; 264 unsigned long flags; 265 int need_dev; 266 } mount; 267 } param; 268 u8 param_type; 269 bool granted; 270 u8 retry; 271 u8 profile; 272 u8 mode; /* One of tomoyo_mode_index . */ 273 u8 type; 274}; 275 276/* 277 * tomoyo_path_info is a structure which is used for holding a string data 278 * used by TOMOYO. 279 * This structure has several fields for supporting pattern matching. 280 * 281 * (1) "name" is the '\0' terminated string data. 282 * (2) "hash" is full_name_hash(name, strlen(name)). 283 * This allows tomoyo_pathcmp() to compare by hash before actually compare 284 * using strcmp(). 285 * (3) "const_len" is the length of the initial segment of "name" which 286 * consists entirely of non wildcard characters. In other words, the length 287 * which we can compare two strings using strncmp(). 288 * (4) "is_dir" is a bool which is true if "name" ends with "/", 289 * false otherwise. 290 * TOMOYO distinguishes directory and non-directory. A directory ends with 291 * "/" and non-directory does not end with "/". 292 * (5) "is_patterned" is a bool which is true if "name" contains wildcard 293 * characters, false otherwise. This allows TOMOYO to use "hash" and 294 * strcmp() for string comparison if "is_patterned" is false. 295 */ 296struct tomoyo_path_info { 297 const char *name; 298 u32 hash; /* = full_name_hash(name, strlen(name)) */ 299 u16 const_len; /* = tomoyo_const_part_length(name) */ 300 bool is_dir; /* = tomoyo_strendswith(name, "/") */ 301 bool is_patterned; /* = tomoyo_path_contains_pattern(name) */ 302}; 303 304/* 305 * tomoyo_name_entry is a structure which is used for linking 306 * "struct tomoyo_path_info" into tomoyo_name_list . 307 */ 308struct tomoyo_name_entry { 309 struct list_head list; 310 atomic_t users; 311 struct tomoyo_path_info entry; 312}; 313 314struct tomoyo_name_union { 315 const struct tomoyo_path_info *filename; 316 struct tomoyo_group *group; 317 u8 is_group; 318}; 319 320struct tomoyo_number_union { 321 unsigned long values[2]; 322 struct tomoyo_group *group; 323 u8 min_type; 324 u8 max_type; 325 u8 is_group; 326}; 327 328/* Structure for "path_group"/"number_group" directive. */ 329struct tomoyo_group { 330 struct list_head list; 331 const struct tomoyo_path_info *group_name; 332 struct list_head member_list; 333 atomic_t users; 334}; 335 336/* Structure for "path_group" directive. */ 337struct tomoyo_path_group { 338 struct tomoyo_acl_head head; 339 const struct tomoyo_path_info *member_name; 340}; 341 342/* Structure for "number_group" directive. */ 343struct tomoyo_number_group { 344 struct tomoyo_acl_head head; 345 struct tomoyo_number_union number; 346}; 347 348/* 349 * tomoyo_acl_info is a structure which is used for holding 350 * 351 * (1) "list" which is linked to the ->acl_info_list of 352 * "struct tomoyo_domain_info" 353 * (2) "is_deleted" is a bool which is true if this domain is marked as 354 * "deleted", false otherwise. 355 * (3) "type" which tells type of the entry. 356 * 357 * Packing "struct tomoyo_acl_info" allows 358 * "struct tomoyo_path_acl" to embed "u16" and "struct tomoyo_path2_acl" 359 * "struct tomoyo_path_number_acl" "struct tomoyo_mkdev_acl" to embed 360 * "u8" without enlarging their structure size. 361 */ 362struct tomoyo_acl_info { 363 struct list_head list; 364 bool is_deleted; 365 u8 type; /* = one of values in "enum tomoyo_acl_entry_type_index". */ 366} __packed; 367 368/* 369 * tomoyo_domain_info is a structure which is used for holding permissions 370 * (e.g. "allow_read /lib/libc-2.5.so") given to each domain. 371 * It has following fields. 372 * 373 * (1) "list" which is linked to tomoyo_domain_list . 374 * (2) "acl_info_list" which is linked to "struct tomoyo_acl_info". 375 * (3) "domainname" which holds the name of the domain. 376 * (4) "profile" which remembers profile number assigned to this domain. 377 * (5) "is_deleted" is a bool which is true if this domain is marked as 378 * "deleted", false otherwise. 379 * (6) "quota_warned" is a bool which is used for suppressing warning message 380 * when learning mode learned too much entries. 381 * (7) "ignore_global_allow_read" is a bool which is true if this domain 382 * should ignore "allow_read" directive in exception policy. 383 * (8) "transition_failed" is a bool which is set to true when this domain was 384 * unable to create a new domain at tomoyo_find_next_domain() because the 385 * name of the domain to be created was too long or it could not allocate 386 * memory. If set to true, more than one process continued execve() 387 * without domain transition. 388 * (9) "users" is an atomic_t that holds how many "struct cred"->security 389 * are referring this "struct tomoyo_domain_info". If is_deleted == true 390 * and users == 0, this struct will be kfree()d upon next garbage 391 * collection. 392 * 393 * A domain's lifecycle is an analogy of files on / directory. 394 * Multiple domains with the same domainname cannot be created (as with 395 * creating files with the same filename fails with -EEXIST). 396 * If a process reached a domain, that process can reside in that domain after 397 * that domain is marked as "deleted" (as with a process can access an already 398 * open()ed file after that file was unlink()ed). 399 */ 400struct tomoyo_domain_info { 401 struct list_head list; 402 struct list_head acl_info_list; 403 /* Name of this domain. Never NULL. */ 404 const struct tomoyo_path_info *domainname; 405 u8 profile; /* Profile number to use. */ 406 bool is_deleted; /* Delete flag. */ 407 bool quota_warned; /* Quota warnning flag. */ 408 bool ignore_global_allow_read; /* Ignore "allow_read" flag. */ 409 bool transition_failed; /* Domain transition failed flag. */ 410 atomic_t users; /* Number of referring credentials. */ 411}; 412 413/* 414 * tomoyo_path_acl is a structure which is used for holding an 415 * entry with one pathname operation (e.g. open(), mkdir()). 416 * It has following fields. 417 * 418 * (1) "head" which is a "struct tomoyo_acl_info". 419 * (2) "perm" which is a bitmask of permitted operations. 420 * (3) "name" is the pathname. 421 * 422 * Directives held by this structure are "allow_read/write", "allow_execute", 423 * "allow_read", "allow_write", "allow_unlink", "allow_rmdir", 424 * "allow_truncate", "allow_symlink", "allow_rewrite", "allow_chroot" and 425 * "allow_unmount". 426 */ 427struct tomoyo_path_acl { 428 struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH_ACL */ 429 u16 perm; 430 struct tomoyo_name_union name; 431}; 432 433/* 434 * tomoyo_path_number_acl is a structure which is used for holding an 435 * entry with one pathname and one number operation. 436 * It has following fields. 437 * 438 * (1) "head" which is a "struct tomoyo_acl_info". 439 * (2) "perm" which is a bitmask of permitted operations. 440 * (3) "name" is the pathname. 441 * (4) "number" is the numeric value. 442 * 443 * Directives held by this structure are "allow_create", "allow_mkdir", 444 * "allow_ioctl", "allow_mkfifo", "allow_mksock", "allow_chmod", "allow_chown" 445 * and "allow_chgrp". 446 * 447 */ 448struct tomoyo_path_number_acl { 449 struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH_NUMBER_ACL */ 450 u8 perm; 451 struct tomoyo_name_union name; 452 struct tomoyo_number_union number; 453}; 454 455/* 456 * tomoyo_mkdev_acl is a structure which is used for holding an 457 * entry with one pathname and three numbers operation. 458 * It has following fields. 459 * 460 * (1) "head" which is a "struct tomoyo_acl_info". 461 * (2) "perm" which is a bitmask of permitted operations. 462 * (3) "mode" is the create mode. 463 * (4) "major" is the major number of device node. 464 * (5) "minor" is the minor number of device node. 465 * 466 * Directives held by this structure are "allow_mkchar", "allow_mkblock". 467 * 468 */ 469struct tomoyo_mkdev_acl { 470 struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_MKDEV_ACL */ 471 u8 perm; 472 struct tomoyo_name_union name; 473 struct tomoyo_number_union mode; 474 struct tomoyo_number_union major; 475 struct tomoyo_number_union minor; 476}; 477 478/* 479 * tomoyo_path2_acl is a structure which is used for holding an 480 * entry with two pathnames operation (i.e. link(), rename() and pivot_root()). 481 * It has following fields. 482 * 483 * (1) "head" which is a "struct tomoyo_acl_info". 484 * (2) "perm" which is a bitmask of permitted operations. 485 * (3) "name1" is the source/old pathname. 486 * (4) "name2" is the destination/new pathname. 487 * 488 * Directives held by this structure are "allow_rename", "allow_link" and 489 * "allow_pivot_root". 490 */ 491struct tomoyo_path2_acl { 492 struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH2_ACL */ 493 u8 perm; 494 struct tomoyo_name_union name1; 495 struct tomoyo_name_union name2; 496}; 497 498/* 499 * tomoyo_mount_acl is a structure which is used for holding an 500 * entry for mount operation. 501 * It has following fields. 502 * 503 * (1) "head" which is a "struct tomoyo_acl_info". 504 * (2) "dev_name" is the device name. 505 * (3) "dir_name" is the mount point. 506 * (4) "fs_type" is the filesystem type. 507 * (5) "flags" is the mount flags. 508 * 509 * Directive held by this structure is "allow_mount". 510 */ 511struct tomoyo_mount_acl { 512 struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_MOUNT_ACL */ 513 struct tomoyo_name_union dev_name; 514 struct tomoyo_name_union dir_name; 515 struct tomoyo_name_union fs_type; 516 struct tomoyo_number_union flags; 517}; 518 519/* 520 * tomoyo_io_buffer is a structure which is used for reading and modifying 521 * configuration via /sys/kernel/security/tomoyo/ interface. 522 * It has many fields. ->read_var1 , ->read_var2 , ->write_var1 are used as 523 * cursors. 524 * 525 * Since the content of /sys/kernel/security/tomoyo/domain_policy is a list of 526 * "struct tomoyo_domain_info" entries and each "struct tomoyo_domain_info" 527 * entry has a list of "struct tomoyo_acl_info", we need two cursors when 528 * reading (one is for traversing tomoyo_domain_list and the other is for 529 * traversing "struct tomoyo_acl_info"->acl_info_list ). 530 * 531 * If a line written to /sys/kernel/security/tomoyo/domain_policy starts with 532 * "select ", TOMOYO seeks the cursor ->read_var1 and ->write_var1 to the 533 * domain with the domainname specified by the rest of that line (NULL is set 534 * if seek failed). 535 * If a line written to /sys/kernel/security/tomoyo/domain_policy starts with 536 * "delete ", TOMOYO deletes an entry or a domain specified by the rest of that 537 * line (->write_var1 is set to NULL if a domain was deleted). 538 * If a line written to /sys/kernel/security/tomoyo/domain_policy starts with 539 * neither "select " nor "delete ", an entry or a domain specified by that line 540 * is appended. 541 */ 542struct tomoyo_io_buffer { 543 void (*read) (struct tomoyo_io_buffer *); 544 int (*write) (struct tomoyo_io_buffer *); 545 int (*poll) (struct file *file, poll_table *wait); 546 /* Exclusive lock for this structure. */ 547 struct mutex io_sem; 548 /* Index returned by tomoyo_read_lock(). */ 549 int reader_idx; 550 /* The position currently reading from. */ 551 struct list_head *read_var1; 552 /* Extra variables for reading. */ 553 struct list_head *read_var2; 554 /* The position currently writing to. */ 555 struct tomoyo_domain_info *write_var1; 556 /* The step for reading. */ 557 int read_step; 558 /* Buffer for reading. */ 559 char *read_buf; 560 /* EOF flag for reading. */ 561 bool read_eof; 562 /* Read domain ACL of specified PID? */ 563 bool read_single_domain; 564 /* Extra variable for reading. */ 565 u8 read_bit; 566 /* Bytes available for reading. */ 567 int read_avail; 568 /* Size of read buffer. */ 569 int readbuf_size; 570 /* Buffer for writing. */ 571 char *write_buf; 572 /* Bytes available for writing. */ 573 int write_avail; 574 /* Size of write buffer. */ 575 int writebuf_size; 576 /* Type of this interface. */ 577 u8 type; 578}; 579 580/* 581 * tomoyo_globally_readable_file_entry is a structure which is used for holding 582 * "allow_read" entries. 583 * It has following fields. 584 * 585 * (1) "head" is "struct tomoyo_acl_head". 586 * (2) "filename" is a pathname which is allowed to open(O_RDONLY). 587 */ 588struct tomoyo_globally_readable_file_entry { 589 struct tomoyo_acl_head head; 590 const struct tomoyo_path_info *filename; 591}; 592 593/* 594 * tomoyo_pattern_entry is a structure which is used for holding 595 * "file_pattern" entries. 596 * It has following fields. 597 * 598 * (1) "head" is "struct tomoyo_acl_head". 599 * (2) "pattern" is a pathname pattern which is used for converting pathnames 600 * to pathname patterns during learning mode. 601 */ 602struct tomoyo_pattern_entry { 603 struct tomoyo_acl_head head; 604 const struct tomoyo_path_info *pattern; 605}; 606 607/* 608 * tomoyo_no_rewrite_entry is a structure which is used for holding 609 * "deny_rewrite" entries. 610 * It has following fields. 611 * 612 * (1) "head" is "struct tomoyo_acl_head". 613 * (2) "pattern" is a pathname which is by default not permitted to modify 614 * already existing content. 615 */ 616struct tomoyo_no_rewrite_entry { 617 struct tomoyo_acl_head head; 618 const struct tomoyo_path_info *pattern; 619}; 620 621/* 622 * tomoyo_domain_initializer_entry is a structure which is used for holding 623 * "initialize_domain" and "no_initialize_domain" entries. 624 * It has following fields. 625 * 626 * (1) "head" is "struct tomoyo_acl_head". 627 * (2) "is_not" is a bool which is true if "no_initialize_domain", false 628 * otherwise. 629 * (3) "is_last_name" is a bool which is true if "domainname" is "the last 630 * component of a domainname", false otherwise. 631 * (4) "domainname" which is "a domainname" or "the last component of a 632 * domainname". This field is NULL if "from" clause is not specified. 633 * (5) "program" which is a program's pathname. 634 */ 635struct tomoyo_domain_initializer_entry { 636 struct tomoyo_acl_head head; 637 bool is_not; /* True if this entry is "no_initialize_domain". */ 638 /* True if the domainname is tomoyo_get_last_name(). */ 639 bool is_last_name; 640 const struct tomoyo_path_info *domainname; /* This may be NULL */ 641 const struct tomoyo_path_info *program; 642}; 643 644/* 645 * tomoyo_domain_keeper_entry is a structure which is used for holding 646 * "keep_domain" and "no_keep_domain" entries. 647 * It has following fields. 648 * 649 * (1) "head" is "struct tomoyo_acl_head". 650 * (2) "is_not" is a bool which is true if "no_initialize_domain", false 651 * otherwise. 652 * (3) "is_last_name" is a bool which is true if "domainname" is "the last 653 * component of a domainname", false otherwise. 654 * (4) "domainname" which is "a domainname" or "the last component of a 655 * domainname". 656 * (5) "program" which is a program's pathname. 657 * This field is NULL if "from" clause is not specified. 658 */ 659struct tomoyo_domain_keeper_entry { 660 struct tomoyo_acl_head head; 661 bool is_not; /* True if this entry is "no_keep_domain". */ 662 /* True if the domainname is tomoyo_get_last_name(). */ 663 bool is_last_name; 664 const struct tomoyo_path_info *domainname; 665 const struct tomoyo_path_info *program; /* This may be NULL */ 666}; 667 668/* 669 * tomoyo_aggregator_entry is a structure which is used for holding 670 * "aggregator" entries. 671 * It has following fields. 672 * 673 * (1) "head" is "struct tomoyo_acl_head". 674 * (2) "original_name" which is originally requested name. 675 * (3) "aggregated_name" which is name to rewrite. 676 */ 677struct tomoyo_aggregator_entry { 678 struct tomoyo_acl_head head; 679 const struct tomoyo_path_info *original_name; 680 const struct tomoyo_path_info *aggregated_name; 681}; 682 683/* 684 * tomoyo_policy_manager_entry is a structure which is used for holding list of 685 * domainnames or programs which are permitted to modify configuration via 686 * /sys/kernel/security/tomoyo/ interface. 687 * It has following fields. 688 * 689 * (1) "head" is "struct tomoyo_acl_head". 690 * (2) "is_domain" is a bool which is true if "manager" is a domainname, false 691 * otherwise. 692 * (3) "manager" is a domainname or a program's pathname. 693 */ 694struct tomoyo_policy_manager_entry { 695 struct tomoyo_acl_head head; 696 bool is_domain; /* True if manager is a domainname. */ 697 /* A path to program or a domainname. */ 698 const struct tomoyo_path_info *manager; 699}; 700 701struct tomoyo_preference { 702 unsigned int learning_max_entry; 703 bool enforcing_verbose; 704 bool learning_verbose; 705 bool permissive_verbose; 706}; 707 708struct tomoyo_profile { 709 const struct tomoyo_path_info *comment; 710 struct tomoyo_preference *learning; 711 struct tomoyo_preference *permissive; 712 struct tomoyo_preference *enforcing; 713 struct tomoyo_preference preference; 714 u8 default_config; 715 u8 config[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX]; 716}; 717 718/********** Function prototypes. **********/ 719 720extern asmlinkage long sys_getpid(void); 721extern asmlinkage long sys_getppid(void); 722 723/* Check whether the given string starts with the given keyword. */ 724bool tomoyo_str_starts(char **src, const char *find); 725/* Get tomoyo_realpath() of current process. */ 726const char *tomoyo_get_exe(void); 727/* Format string. */ 728void tomoyo_normalize_line(unsigned char *buffer); 729/* Print warning or error message on console. */ 730void tomoyo_warn_log(struct tomoyo_request_info *r, const char *fmt, ...) 731 __attribute__ ((format(printf, 2, 3))); 732/* Check all profiles currently assigned to domains are defined. */ 733void tomoyo_check_profile(void); 734/* Open operation for /sys/kernel/security/tomoyo/ interface. */ 735int tomoyo_open_control(const u8 type, struct file *file); 736/* Close /sys/kernel/security/tomoyo/ interface. */ 737int tomoyo_close_control(struct file *file); 738/* Read operation for /sys/kernel/security/tomoyo/ interface. */ 739int tomoyo_read_control(struct file *file, char __user *buffer, 740 const int buffer_len); 741/* Write operation for /sys/kernel/security/tomoyo/ interface. */ 742int tomoyo_write_control(struct file *file, const char __user *buffer, 743 const int buffer_len); 744/* Check whether the domain has too many ACL entries to hold. */ 745bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r); 746/* Print out of memory warning message. */ 747void tomoyo_warn_oom(const char *function); 748/* Check whether the given name matches the given name_union. */ 749bool tomoyo_compare_name_union(const struct tomoyo_path_info *name, 750 const struct tomoyo_name_union *ptr); 751/* Check whether the given number matches the given number_union. */ 752bool tomoyo_compare_number_union(const unsigned long value, 753 const struct tomoyo_number_union *ptr); 754int tomoyo_get_mode(const u8 profile, const u8 index); 755/* Transactional sprintf() for policy dump. */ 756bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...) 757 __attribute__ ((format(printf, 2, 3))); 758/* Check whether the domainname is correct. */ 759bool tomoyo_correct_domain(const unsigned char *domainname); 760/* Check whether the token is correct. */ 761bool tomoyo_correct_path(const char *filename); 762bool tomoyo_correct_word(const char *string); 763/* Check whether the token can be a domainname. */ 764bool tomoyo_domain_def(const unsigned char *buffer); 765bool tomoyo_parse_name_union(const char *filename, 766 struct tomoyo_name_union *ptr); 767/* Check whether the given filename matches the given path_group. */ 768bool tomoyo_path_matches_group(const struct tomoyo_path_info *pathname, 769 const struct tomoyo_group *group); 770/* Check whether the given value matches the given number_group. */ 771bool tomoyo_number_matches_group(const unsigned long min, 772 const unsigned long max, 773 const struct tomoyo_group *group); 774/* Check whether the given filename matches the given pattern. */ 775bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename, 776 const struct tomoyo_path_info *pattern); 777 778bool tomoyo_print_number_union(struct tomoyo_io_buffer *head, 779 const struct tomoyo_number_union *ptr); 780bool tomoyo_parse_number_union(char *data, struct tomoyo_number_union *num); 781/* Tokenize a line. */ 782bool tomoyo_tokenize(char *buffer, char *w[], size_t size); 783/* Write domain policy violation warning message to console? */ 784bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain); 785/* Get the last component of the given domainname. */ 786const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain); 787/* Fill "struct tomoyo_request_info". */ 788int tomoyo_init_request_info(struct tomoyo_request_info *r, 789 struct tomoyo_domain_info *domain, 790 const u8 index); 791/* Check permission for mount operation. */ 792int tomoyo_mount_permission(char *dev_name, struct path *path, char *type, 793 unsigned long flags, void *data_page); 794/* Create "aggregator" entry in exception policy. */ 795int tomoyo_write_aggregator_policy(char *data, const bool is_delete); 796/* 797 * Create "initialize_domain" and "no_initialize_domain" entry 798 * in exception policy. 799 */ 800int tomoyo_write_domain_initializer_policy(char *data, const bool is_not, 801 const bool is_delete); 802/* Create "keep_domain" and "no_keep_domain" entry in exception policy. */ 803int tomoyo_write_domain_keeper_policy(char *data, const bool is_not, 804 const bool is_delete); 805/* 806 * Create "allow_read/write", "allow_execute", "allow_read", "allow_write", 807 * "allow_create", "allow_unlink", "allow_mkdir", "allow_rmdir", 808 * "allow_mkfifo", "allow_mksock", "allow_mkblock", "allow_mkchar", 809 * "allow_truncate", "allow_symlink", "allow_rewrite", "allow_rename" and 810 * "allow_link" entry in domain policy. 811 */ 812int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, 813 const bool is_delete); 814/* Create "allow_read" entry in exception policy. */ 815int tomoyo_write_globally_readable_policy(char *data, const bool is_delete); 816/* Create "allow_mount" entry in domain policy. */ 817int tomoyo_write_mount_policy(char *data, struct tomoyo_domain_info *domain, 818 const bool is_delete); 819/* Create "deny_rewrite" entry in exception policy. */ 820int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete); 821/* Create "file_pattern" entry in exception policy. */ 822int tomoyo_write_pattern_policy(char *data, const bool is_delete); 823/* Create "path_group"/"number_group" entry in exception policy. */ 824int tomoyo_write_group(char *data, const bool is_delete, const u8 type); 825int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) 826 __attribute__ ((format(printf, 2, 3))); 827/* Find a domain by the given name. */ 828struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname); 829/* Find or create a domain by the given name. */ 830struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char * 831 domainname, 832 const u8 profile); 833struct tomoyo_profile *tomoyo_profile(const u8 profile); 834/* 835 * Allocate memory for "struct tomoyo_path_group"/"struct tomoyo_number_group". 836 */ 837struct tomoyo_group *tomoyo_get_group(const char *group_name, const u8 type); 838 839/* Check mode for specified functionality. */ 840unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain, 841 const u8 index); 842/* Fill in "struct tomoyo_path_info" members. */ 843void tomoyo_fill_path_info(struct tomoyo_path_info *ptr); 844/* Run policy loader when /sbin/init starts. */ 845void tomoyo_load_policy(const char *filename); 846 847void tomoyo_put_number_union(struct tomoyo_number_union *ptr); 848 849/* Convert binary string to ascii string. */ 850char *tomoyo_encode(const char *str); 851 852/* 853 * Returns realpath(3) of the given pathname except that 854 * ignores chroot'ed root and does not follow the final symlink. 855 */ 856char *tomoyo_realpath_nofollow(const char *pathname); 857/* 858 * Returns realpath(3) of the given pathname except that 859 * ignores chroot'ed root and the pathname is already solved. 860 */ 861char *tomoyo_realpath_from_path(struct path *path); 862/* Get patterned pathname. */ 863const char *tomoyo_file_pattern(const struct tomoyo_path_info *filename); 864 865/* Check memory quota. */ 866bool tomoyo_memory_ok(void *ptr); 867void *tomoyo_commit_ok(void *data, const unsigned int size); 868 869/* 870 * Keep the given name on the RAM. 871 * The RAM is shared, so NEVER try to modify or kfree() the returned name. 872 */ 873const struct tomoyo_path_info *tomoyo_get_name(const char *name); 874 875/* Check for memory usage. */ 876void tomoyo_read_memory_counter(struct tomoyo_io_buffer *head); 877 878/* Set memory quota. */ 879int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head); 880 881/* Initialize mm related code. */ 882void __init tomoyo_mm_init(void); 883int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation, 884 const struct tomoyo_path_info *filename); 885int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, 886 struct path *path, const int flag); 887int tomoyo_path_number_perm(const u8 operation, struct path *path, 888 unsigned long number); 889int tomoyo_mkdev_perm(const u8 operation, struct path *path, 890 const unsigned int mode, unsigned int dev); 891int tomoyo_path_perm(const u8 operation, struct path *path); 892int tomoyo_path2_perm(const u8 operation, struct path *path1, 893 struct path *path2); 894int tomoyo_find_next_domain(struct linux_binprm *bprm); 895 896void tomoyo_print_ulong(char *buffer, const int buffer_len, 897 const unsigned long value, const u8 type); 898 899/* Drop refcount on tomoyo_name_union. */ 900void tomoyo_put_name_union(struct tomoyo_name_union *ptr); 901 902/* Run garbage collector. */ 903void tomoyo_run_gc(void); 904 905void tomoyo_memory_free(void *ptr); 906 907int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size, 908 bool is_delete, struct tomoyo_domain_info *domain, 909 bool (*check_duplicate) (const struct tomoyo_acl_info 910 *, 911 const struct tomoyo_acl_info 912 *), 913 bool (*merge_duplicate) (struct tomoyo_acl_info *, 914 struct tomoyo_acl_info *, 915 const bool)); 916int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size, 917 bool is_delete, struct list_head *list, 918 bool (*check_duplicate) (const struct tomoyo_acl_head 919 *, 920 const struct tomoyo_acl_head 921 *)); 922void tomoyo_check_acl(struct tomoyo_request_info *r, 923 bool (*check_entry) (const struct tomoyo_request_info *, 924 const struct tomoyo_acl_info *)); 925 926/********** External variable definitions. **********/ 927 928/* Lock for GC. */ 929extern struct srcu_struct tomoyo_ss; 930 931/* The list for "struct tomoyo_domain_info". */ 932extern struct list_head tomoyo_domain_list; 933 934extern struct list_head tomoyo_policy_list[TOMOYO_MAX_POLICY]; 935extern struct list_head tomoyo_group_list[TOMOYO_MAX_GROUP]; 936extern struct list_head tomoyo_name_list[TOMOYO_MAX_HASH]; 937 938/* Lock for protecting policy. */ 939extern struct mutex tomoyo_policy_lock; 940 941/* Has /sbin/init started? */ 942extern bool tomoyo_policy_loaded; 943 944/* The kernel's domain. */ 945extern struct tomoyo_domain_info tomoyo_kernel_domain; 946 947extern const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION]; 948extern const char *tomoyo_mkdev_keyword[TOMOYO_MAX_MKDEV_OPERATION]; 949extern const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION]; 950extern const char *tomoyo_path_number_keyword[TOMOYO_MAX_PATH_NUMBER_OPERATION]; 951 952extern unsigned int tomoyo_quota_for_query; 953extern unsigned int tomoyo_query_memory_size; 954 955/********** Inlined functions. **********/ 956 957static inline int tomoyo_read_lock(void) 958{ 959 return srcu_read_lock(&tomoyo_ss); 960} 961 962static inline void tomoyo_read_unlock(int idx) 963{ 964 srcu_read_unlock(&tomoyo_ss, idx); 965} 966 967/* strcmp() for "struct tomoyo_path_info" structure. */ 968static inline bool tomoyo_pathcmp(const struct tomoyo_path_info *a, 969 const struct tomoyo_path_info *b) 970{ 971 return a->hash != b->hash || strcmp(a->name, b->name); 972} 973 974/** 975 * tomoyo_valid - Check whether the character is a valid char. 976 * 977 * @c: The character to check. 978 * 979 * Returns true if @c is a valid character, false otherwise. 980 */ 981static inline bool tomoyo_valid(const unsigned char c) 982{ 983 return c > ' ' && c < 127; 984} 985 986/** 987 * tomoyo_invalid - Check whether the character is an invalid char. 988 * 989 * @c: The character to check. 990 * 991 * Returns true if @c is an invalid character, false otherwise. 992 */ 993static inline bool tomoyo_invalid(const unsigned char c) 994{ 995 return c && (c <= ' ' || c >= 127); 996} 997 998static inline void tomoyo_put_name(const struct tomoyo_path_info *name) 999{ 1000 if (name) { 1001 struct tomoyo_name_entry *ptr = 1002 container_of(name, struct tomoyo_name_entry, entry); 1003 atomic_dec(&ptr->users); 1004 } 1005} 1006 1007static inline void tomoyo_put_group(struct tomoyo_group *group) 1008{ 1009 if (group) 1010 atomic_dec(&group->users); 1011} 1012 1013static inline struct tomoyo_domain_info *tomoyo_domain(void) 1014{ 1015 return current_cred()->security; 1016} 1017 1018static inline struct tomoyo_domain_info *tomoyo_real_domain(struct task_struct 1019 *task) 1020{ 1021 return task_cred_xxx(task, security); 1022} 1023 1024static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *p1, 1025 const struct tomoyo_acl_info *p2) 1026{ 1027 return p1->type == p2->type; 1028} 1029 1030static inline bool tomoyo_same_name_union 1031(const struct tomoyo_name_union *p1, const struct tomoyo_name_union *p2) 1032{ 1033 return p1->filename == p2->filename && p1->group == p2->group && 1034 p1->is_group == p2->is_group; 1035} 1036 1037static inline bool tomoyo_same_number_union 1038(const struct tomoyo_number_union *p1, const struct tomoyo_number_union *p2) 1039{ 1040 return p1->values[0] == p2->values[0] && p1->values[1] == p2->values[1] 1041 && p1->group == p2->group && p1->min_type == p2->min_type && 1042 p1->max_type == p2->max_type && p1->is_group == p2->is_group; 1043} 1044 1045/** 1046 * list_for_each_cookie - iterate over a list with cookie. 1047 * @pos: the &struct list_head to use as a loop cursor. 1048 * @cookie: the &struct list_head to use as a cookie. 1049 * @head: the head for your list. 1050 * 1051 * Same with list_for_each_rcu() except that this primitive uses @cookie 1052 * so that we can continue iteration. 1053 * @cookie must be NULL when iteration starts, and @cookie will become 1054 * NULL when iteration finishes. 1055 */ 1056#define list_for_each_cookie(pos, cookie, head) \ 1057 for (({ if (!cookie) \ 1058 cookie = head; }), \ 1059 pos = rcu_dereference((cookie)->next); \ 1060 prefetch(pos->next), pos != (head) || ((cookie) = NULL); \ 1061 (cookie) = pos, pos = rcu_dereference(pos->next)) 1062 1063#endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */ 1064