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