common.h revision a98aa4debe2728abb3353e35fc5d110dcc0d7f0d
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 49/* Keywords for ACLs. */ 50#define TOMOYO_KEYWORD_AGGREGATOR "aggregator " 51#define TOMOYO_KEYWORD_ALIAS "alias " 52#define TOMOYO_KEYWORD_ALLOW_MOUNT "allow_mount " 53#define TOMOYO_KEYWORD_ALLOW_READ "allow_read " 54#define TOMOYO_KEYWORD_DELETE "delete " 55#define TOMOYO_KEYWORD_DENY_REWRITE "deny_rewrite " 56#define TOMOYO_KEYWORD_FILE_PATTERN "file_pattern " 57#define TOMOYO_KEYWORD_INITIALIZE_DOMAIN "initialize_domain " 58#define TOMOYO_KEYWORD_KEEP_DOMAIN "keep_domain " 59#define TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN "no_initialize_domain " 60#define TOMOYO_KEYWORD_NO_KEEP_DOMAIN "no_keep_domain " 61#define TOMOYO_KEYWORD_PATH_GROUP "path_group " 62#define TOMOYO_KEYWORD_NUMBER_GROUP "number_group " 63#define TOMOYO_KEYWORD_SELECT "select " 64#define TOMOYO_KEYWORD_USE_PROFILE "use_profile " 65#define TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "ignore_global_allow_read" 66#define TOMOYO_KEYWORD_QUOTA_EXCEEDED "quota_exceeded" 67#define TOMOYO_KEYWORD_TRANSITION_FAILED "transition_failed" 68/* A domain definition starts with <kernel>. */ 69#define TOMOYO_ROOT_NAME "<kernel>" 70#define TOMOYO_ROOT_NAME_LEN (sizeof(TOMOYO_ROOT_NAME) - 1) 71 72/* Value type definition. */ 73#define TOMOYO_VALUE_TYPE_INVALID 0 74#define TOMOYO_VALUE_TYPE_DECIMAL 1 75#define TOMOYO_VALUE_TYPE_OCTAL 2 76#define TOMOYO_VALUE_TYPE_HEXADECIMAL 3 77 78/* Index numbers for Access Controls. */ 79enum tomoyo_acl_entry_type_index { 80 TOMOYO_TYPE_PATH_ACL, 81 TOMOYO_TYPE_PATH2_ACL, 82 TOMOYO_TYPE_PATH_NUMBER_ACL, 83 TOMOYO_TYPE_MKDEV_ACL, 84 TOMOYO_TYPE_MOUNT_ACL, 85}; 86 87/* Index numbers for File Controls. */ 88 89/* 90 * TOMOYO_TYPE_READ_WRITE is special. TOMOYO_TYPE_READ_WRITE is automatically 91 * set if both TOMOYO_TYPE_READ and TOMOYO_TYPE_WRITE are set. 92 * Both TOMOYO_TYPE_READ and TOMOYO_TYPE_WRITE are automatically set if 93 * TOMOYO_TYPE_READ_WRITE is set. 94 * TOMOYO_TYPE_READ_WRITE is automatically cleared if either TOMOYO_TYPE_READ 95 * or TOMOYO_TYPE_WRITE is cleared. 96 * Both TOMOYO_TYPE_READ and TOMOYO_TYPE_WRITE are automatically cleared if 97 * TOMOYO_TYPE_READ_WRITE is cleared. 98 */ 99 100enum tomoyo_path_acl_index { 101 TOMOYO_TYPE_READ_WRITE, 102 TOMOYO_TYPE_EXECUTE, 103 TOMOYO_TYPE_READ, 104 TOMOYO_TYPE_WRITE, 105 TOMOYO_TYPE_UNLINK, 106 TOMOYO_TYPE_RMDIR, 107 TOMOYO_TYPE_TRUNCATE, 108 TOMOYO_TYPE_SYMLINK, 109 TOMOYO_TYPE_REWRITE, 110 TOMOYO_TYPE_CHROOT, 111 TOMOYO_TYPE_UMOUNT, 112 TOMOYO_MAX_PATH_OPERATION 113}; 114 115#define TOMOYO_RW_MASK ((1 << TOMOYO_TYPE_READ) | (1 << TOMOYO_TYPE_WRITE)) 116 117enum tomoyo_mkdev_acl_index { 118 TOMOYO_TYPE_MKBLOCK, 119 TOMOYO_TYPE_MKCHAR, 120 TOMOYO_MAX_MKDEV_OPERATION 121}; 122 123enum tomoyo_path2_acl_index { 124 TOMOYO_TYPE_LINK, 125 TOMOYO_TYPE_RENAME, 126 TOMOYO_TYPE_PIVOT_ROOT, 127 TOMOYO_MAX_PATH2_OPERATION 128}; 129 130enum tomoyo_path_number_acl_index { 131 TOMOYO_TYPE_CREATE, 132 TOMOYO_TYPE_MKDIR, 133 TOMOYO_TYPE_MKFIFO, 134 TOMOYO_TYPE_MKSOCK, 135 TOMOYO_TYPE_IOCTL, 136 TOMOYO_TYPE_CHMOD, 137 TOMOYO_TYPE_CHOWN, 138 TOMOYO_TYPE_CHGRP, 139 TOMOYO_MAX_PATH_NUMBER_OPERATION 140}; 141 142enum tomoyo_securityfs_interface_index { 143 TOMOYO_DOMAINPOLICY, 144 TOMOYO_EXCEPTIONPOLICY, 145 TOMOYO_DOMAIN_STATUS, 146 TOMOYO_PROCESS_STATUS, 147 TOMOYO_MEMINFO, 148 TOMOYO_SELFDOMAIN, 149 TOMOYO_VERSION, 150 TOMOYO_PROFILE, 151 TOMOYO_QUERY, 152 TOMOYO_MANAGER 153}; 154 155enum tomoyo_mac_index { 156 TOMOYO_MAC_FILE_EXECUTE, 157 TOMOYO_MAC_FILE_OPEN, 158 TOMOYO_MAC_FILE_CREATE, 159 TOMOYO_MAC_FILE_UNLINK, 160 TOMOYO_MAC_FILE_MKDIR, 161 TOMOYO_MAC_FILE_RMDIR, 162 TOMOYO_MAC_FILE_MKFIFO, 163 TOMOYO_MAC_FILE_MKSOCK, 164 TOMOYO_MAC_FILE_TRUNCATE, 165 TOMOYO_MAC_FILE_SYMLINK, 166 TOMOYO_MAC_FILE_REWRITE, 167 TOMOYO_MAC_FILE_MKBLOCK, 168 TOMOYO_MAC_FILE_MKCHAR, 169 TOMOYO_MAC_FILE_LINK, 170 TOMOYO_MAC_FILE_RENAME, 171 TOMOYO_MAC_FILE_CHMOD, 172 TOMOYO_MAC_FILE_CHOWN, 173 TOMOYO_MAC_FILE_CHGRP, 174 TOMOYO_MAC_FILE_IOCTL, 175 TOMOYO_MAC_FILE_CHROOT, 176 TOMOYO_MAC_FILE_MOUNT, 177 TOMOYO_MAC_FILE_UMOUNT, 178 TOMOYO_MAC_FILE_PIVOT_ROOT, 179 TOMOYO_MAX_MAC_INDEX 180}; 181 182enum tomoyo_mac_category_index { 183 TOMOYO_MAC_CATEGORY_FILE, 184 TOMOYO_MAX_MAC_CATEGORY_INDEX 185}; 186 187#define TOMOYO_RETRY_REQUEST 1 /* Retry this request. */ 188 189/********** Structure definitions. **********/ 190 191/* 192 * tomoyo_acl_head is a structure which is used for holding elements not in 193 * domain policy. 194 * It has following fields. 195 * 196 * (1) "list" which is linked to tomoyo_policy_list[] . 197 * (2) "is_deleted" is a bool which is true if marked as deleted, false 198 * otherwise. 199 */ 200struct tomoyo_acl_head { 201 struct list_head list; 202 bool is_deleted; 203} __packed; 204 205/* 206 * tomoyo_request_info is a structure which is used for holding 207 * 208 * (1) Domain information of current process. 209 * (2) How many retries are made for this request. 210 * (3) Profile number used for this request. 211 * (4) Access control mode of the profile. 212 */ 213struct tomoyo_request_info { 214 struct tomoyo_domain_info *domain; 215 /* For holding parameters. */ 216 union { 217 struct { 218 const struct tomoyo_path_info *filename; 219 u8 operation; 220 } path; 221 struct { 222 const struct tomoyo_path_info *filename1; 223 const struct tomoyo_path_info *filename2; 224 u8 operation; 225 } path2; 226 struct { 227 const struct tomoyo_path_info *filename; 228 unsigned int mode; 229 unsigned int major; 230 unsigned int minor; 231 u8 operation; 232 } mkdev; 233 struct { 234 const struct tomoyo_path_info *filename; 235 unsigned long number; 236 u8 operation; 237 } path_number; 238 struct { 239 const struct tomoyo_path_info *type; 240 const struct tomoyo_path_info *dir; 241 const struct tomoyo_path_info *dev; 242 unsigned long flags; 243 int need_dev; 244 } mount; 245 } param; 246 u8 param_type; 247 bool granted; 248 u8 retry; 249 u8 profile; 250 u8 mode; /* One of tomoyo_mode_index . */ 251 u8 type; 252}; 253 254/* 255 * tomoyo_path_info is a structure which is used for holding a string data 256 * used by TOMOYO. 257 * This structure has several fields for supporting pattern matching. 258 * 259 * (1) "name" is the '\0' terminated string data. 260 * (2) "hash" is full_name_hash(name, strlen(name)). 261 * This allows tomoyo_pathcmp() to compare by hash before actually compare 262 * using strcmp(). 263 * (3) "const_len" is the length of the initial segment of "name" which 264 * consists entirely of non wildcard characters. In other words, the length 265 * which we can compare two strings using strncmp(). 266 * (4) "is_dir" is a bool which is true if "name" ends with "/", 267 * false otherwise. 268 * TOMOYO distinguishes directory and non-directory. A directory ends with 269 * "/" and non-directory does not end with "/". 270 * (5) "is_patterned" is a bool which is true if "name" contains wildcard 271 * characters, false otherwise. This allows TOMOYO to use "hash" and 272 * strcmp() for string comparison if "is_patterned" is false. 273 */ 274struct tomoyo_path_info { 275 const char *name; 276 u32 hash; /* = full_name_hash(name, strlen(name)) */ 277 u16 const_len; /* = tomoyo_const_part_length(name) */ 278 bool is_dir; /* = tomoyo_strendswith(name, "/") */ 279 bool is_patterned; /* = tomoyo_path_contains_pattern(name) */ 280}; 281 282/* 283 * tomoyo_name_entry is a structure which is used for linking 284 * "struct tomoyo_path_info" into tomoyo_name_list . 285 */ 286struct tomoyo_name_entry { 287 struct list_head list; 288 atomic_t users; 289 struct tomoyo_path_info entry; 290}; 291 292struct tomoyo_name_union { 293 const struct tomoyo_path_info *filename; 294 struct tomoyo_group *group; 295 u8 is_group; 296}; 297 298struct tomoyo_number_union { 299 unsigned long values[2]; 300 struct tomoyo_group *group; 301 u8 min_type; 302 u8 max_type; 303 u8 is_group; 304}; 305 306/* Structure for "path_group"/"number_group" directive. */ 307struct tomoyo_group { 308 struct list_head list; 309 const struct tomoyo_path_info *group_name; 310 struct list_head member_list; 311 atomic_t users; 312}; 313 314/* Structure for "path_group" directive. */ 315struct tomoyo_path_group { 316 struct tomoyo_acl_head head; 317 const struct tomoyo_path_info *member_name; 318}; 319 320/* Structure for "number_group" directive. */ 321struct tomoyo_number_group { 322 struct tomoyo_acl_head head; 323 struct tomoyo_number_union number; 324}; 325 326/* 327 * tomoyo_acl_info is a structure which is used for holding 328 * 329 * (1) "list" which is linked to the ->acl_info_list of 330 * "struct tomoyo_domain_info" 331 * (2) "is_deleted" is a bool which is true if this domain is marked as 332 * "deleted", false otherwise. 333 * (3) "type" which tells type of the entry. 334 * 335 * Packing "struct tomoyo_acl_info" allows 336 * "struct tomoyo_path_acl" to embed "u16" and "struct tomoyo_path2_acl" 337 * "struct tomoyo_path_number_acl" "struct tomoyo_mkdev_acl" to embed 338 * "u8" without enlarging their structure size. 339 */ 340struct tomoyo_acl_info { 341 struct list_head list; 342 bool is_deleted; 343 u8 type; /* = one of values in "enum tomoyo_acl_entry_type_index". */ 344} __packed; 345 346/* 347 * tomoyo_domain_info is a structure which is used for holding permissions 348 * (e.g. "allow_read /lib/libc-2.5.so") given to each domain. 349 * It has following fields. 350 * 351 * (1) "list" which is linked to tomoyo_domain_list . 352 * (2) "acl_info_list" which is linked to "struct tomoyo_acl_info". 353 * (3) "domainname" which holds the name of the domain. 354 * (4) "profile" which remembers profile number assigned to this domain. 355 * (5) "is_deleted" is a bool which is true if this domain is marked as 356 * "deleted", false otherwise. 357 * (6) "quota_warned" is a bool which is used for suppressing warning message 358 * when learning mode learned too much entries. 359 * (7) "ignore_global_allow_read" is a bool which is true if this domain 360 * should ignore "allow_read" directive in exception policy. 361 * (8) "transition_failed" is a bool which is set to true when this domain was 362 * unable to create a new domain at tomoyo_find_next_domain() because the 363 * name of the domain to be created was too long or it could not allocate 364 * memory. If set to true, more than one process continued execve() 365 * without domain transition. 366 * (9) "users" is an atomic_t that holds how many "struct cred"->security 367 * are referring this "struct tomoyo_domain_info". If is_deleted == true 368 * and users == 0, this struct will be kfree()d upon next garbage 369 * collection. 370 * 371 * A domain's lifecycle is an analogy of files on / directory. 372 * Multiple domains with the same domainname cannot be created (as with 373 * creating files with the same filename fails with -EEXIST). 374 * If a process reached a domain, that process can reside in that domain after 375 * that domain is marked as "deleted" (as with a process can access an already 376 * open()ed file after that file was unlink()ed). 377 */ 378struct tomoyo_domain_info { 379 struct list_head list; 380 struct list_head acl_info_list; 381 /* Name of this domain. Never NULL. */ 382 const struct tomoyo_path_info *domainname; 383 u8 profile; /* Profile number to use. */ 384 bool is_deleted; /* Delete flag. */ 385 bool quota_warned; /* Quota warnning flag. */ 386 bool ignore_global_allow_read; /* Ignore "allow_read" flag. */ 387 bool transition_failed; /* Domain transition failed flag. */ 388 atomic_t users; /* Number of referring credentials. */ 389}; 390 391/* 392 * tomoyo_path_acl is a structure which is used for holding an 393 * entry with one pathname operation (e.g. open(), mkdir()). 394 * It has following fields. 395 * 396 * (1) "head" which is a "struct tomoyo_acl_info". 397 * (2) "perm" which is a bitmask of permitted operations. 398 * (3) "name" is the pathname. 399 * 400 * Directives held by this structure are "allow_read/write", "allow_execute", 401 * "allow_read", "allow_write", "allow_unlink", "allow_rmdir", 402 * "allow_truncate", "allow_symlink", "allow_rewrite", "allow_chroot" and 403 * "allow_unmount". 404 */ 405struct tomoyo_path_acl { 406 struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH_ACL */ 407 u16 perm; 408 struct tomoyo_name_union name; 409}; 410 411/* 412 * tomoyo_path_number_acl is a structure which is used for holding an 413 * entry with one pathname and one number operation. 414 * It has following fields. 415 * 416 * (1) "head" which is a "struct tomoyo_acl_info". 417 * (2) "perm" which is a bitmask of permitted operations. 418 * (3) "name" is the pathname. 419 * (4) "number" is the numeric value. 420 * 421 * Directives held by this structure are "allow_create", "allow_mkdir", 422 * "allow_ioctl", "allow_mkfifo", "allow_mksock", "allow_chmod", "allow_chown" 423 * and "allow_chgrp". 424 * 425 */ 426struct tomoyo_path_number_acl { 427 struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH_NUMBER_ACL */ 428 u8 perm; 429 struct tomoyo_name_union name; 430 struct tomoyo_number_union number; 431}; 432 433/* 434 * tomoyo_mkdev_acl is a structure which is used for holding an 435 * entry with one pathname and three numbers 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) "mode" is the create mode. 441 * (4) "major" is the major number of device node. 442 * (5) "minor" is the minor number of device node. 443 * 444 * Directives held by this structure are "allow_mkchar", "allow_mkblock". 445 * 446 */ 447struct tomoyo_mkdev_acl { 448 struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_MKDEV_ACL */ 449 u8 perm; 450 struct tomoyo_name_union name; 451 struct tomoyo_number_union mode; 452 struct tomoyo_number_union major; 453 struct tomoyo_number_union minor; 454}; 455 456/* 457 * tomoyo_path2_acl is a structure which is used for holding an 458 * entry with two pathnames operation (i.e. link(), rename() and pivot_root()). 459 * It has following fields. 460 * 461 * (1) "head" which is a "struct tomoyo_acl_info". 462 * (2) "perm" which is a bitmask of permitted operations. 463 * (3) "name1" is the source/old pathname. 464 * (4) "name2" is the destination/new pathname. 465 * 466 * Directives held by this structure are "allow_rename", "allow_link" and 467 * "allow_pivot_root". 468 */ 469struct tomoyo_path2_acl { 470 struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH2_ACL */ 471 u8 perm; 472 struct tomoyo_name_union name1; 473 struct tomoyo_name_union name2; 474}; 475 476/* 477 * tomoyo_mount_acl is a structure which is used for holding an 478 * entry for mount operation. 479 * It has following fields. 480 * 481 * (1) "head" which is a "struct tomoyo_acl_info". 482 * (2) "dev_name" is the device name. 483 * (3) "dir_name" is the mount point. 484 * (4) "fs_type" is the filesystem type. 485 * (5) "flags" is the mount flags. 486 * 487 * Directive held by this structure is "allow_mount". 488 */ 489struct tomoyo_mount_acl { 490 struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_MOUNT_ACL */ 491 struct tomoyo_name_union dev_name; 492 struct tomoyo_name_union dir_name; 493 struct tomoyo_name_union fs_type; 494 struct tomoyo_number_union flags; 495}; 496 497/* 498 * tomoyo_io_buffer is a structure which is used for reading and modifying 499 * configuration via /sys/kernel/security/tomoyo/ interface. 500 * It has many fields. ->read_var1 , ->read_var2 , ->write_var1 are used as 501 * cursors. 502 * 503 * Since the content of /sys/kernel/security/tomoyo/domain_policy is a list of 504 * "struct tomoyo_domain_info" entries and each "struct tomoyo_domain_info" 505 * entry has a list of "struct tomoyo_acl_info", we need two cursors when 506 * reading (one is for traversing tomoyo_domain_list and the other is for 507 * traversing "struct tomoyo_acl_info"->acl_info_list ). 508 * 509 * If a line written to /sys/kernel/security/tomoyo/domain_policy starts with 510 * "select ", TOMOYO seeks the cursor ->read_var1 and ->write_var1 to the 511 * domain with the domainname specified by the rest of that line (NULL is set 512 * if seek failed). 513 * If a line written to /sys/kernel/security/tomoyo/domain_policy starts with 514 * "delete ", TOMOYO deletes an entry or a domain specified by the rest of that 515 * line (->write_var1 is set to NULL if a domain was deleted). 516 * If a line written to /sys/kernel/security/tomoyo/domain_policy starts with 517 * neither "select " nor "delete ", an entry or a domain specified by that line 518 * is appended. 519 */ 520struct tomoyo_io_buffer { 521 void (*read) (struct tomoyo_io_buffer *); 522 int (*write) (struct tomoyo_io_buffer *); 523 int (*poll) (struct file *file, poll_table *wait); 524 /* Exclusive lock for this structure. */ 525 struct mutex io_sem; 526 /* Index returned by tomoyo_read_lock(). */ 527 int reader_idx; 528 /* The position currently reading from. */ 529 struct list_head *read_var1; 530 /* Extra variables for reading. */ 531 struct list_head *read_var2; 532 /* The position currently writing to. */ 533 struct tomoyo_domain_info *write_var1; 534 /* The step for reading. */ 535 int read_step; 536 /* Buffer for reading. */ 537 char *read_buf; 538 /* EOF flag for reading. */ 539 bool read_eof; 540 /* Read domain ACL of specified PID? */ 541 bool read_single_domain; 542 /* Extra variable for reading. */ 543 u8 read_bit; 544 /* Bytes available for reading. */ 545 int read_avail; 546 /* Size of read buffer. */ 547 int readbuf_size; 548 /* Buffer for writing. */ 549 char *write_buf; 550 /* Bytes available for writing. */ 551 int write_avail; 552 /* Size of write buffer. */ 553 int writebuf_size; 554 /* Type of this interface. */ 555 u8 type; 556}; 557 558/* 559 * tomoyo_globally_readable_file_entry is a structure which is used for holding 560 * "allow_read" entries. 561 * It has following fields. 562 * 563 * (1) "head" is "struct tomoyo_acl_head". 564 * (2) "filename" is a pathname which is allowed to open(O_RDONLY). 565 */ 566struct tomoyo_globally_readable_file_entry { 567 struct tomoyo_acl_head head; 568 const struct tomoyo_path_info *filename; 569}; 570 571/* 572 * tomoyo_pattern_entry is a structure which is used for holding 573 * "tomoyo_pattern_list" entries. 574 * It has following fields. 575 * 576 * (1) "head" is "struct tomoyo_acl_head". 577 * (2) "pattern" is a pathname pattern which is used for converting pathnames 578 * to pathname patterns during learning mode. 579 */ 580struct tomoyo_pattern_entry { 581 struct tomoyo_acl_head head; 582 const struct tomoyo_path_info *pattern; 583}; 584 585/* 586 * tomoyo_no_rewrite_entry is a structure which is used for holding 587 * "deny_rewrite" entries. 588 * It has following fields. 589 * 590 * (1) "head" is "struct tomoyo_acl_head". 591 * (2) "pattern" is a pathname which is by default not permitted to modify 592 * already existing content. 593 */ 594struct tomoyo_no_rewrite_entry { 595 struct tomoyo_acl_head head; 596 const struct tomoyo_path_info *pattern; 597}; 598 599/* 600 * tomoyo_domain_initializer_entry is a structure which is used for holding 601 * "initialize_domain" and "no_initialize_domain" entries. 602 * It has following fields. 603 * 604 * (1) "head" is "struct tomoyo_acl_head". 605 * (2) "is_not" is a bool which is true if "no_initialize_domain", false 606 * otherwise. 607 * (3) "is_last_name" is a bool which is true if "domainname" is "the last 608 * component of a domainname", false otherwise. 609 * (4) "domainname" which is "a domainname" or "the last component of a 610 * domainname". This field is NULL if "from" clause is not specified. 611 * (5) "program" which is a program's pathname. 612 */ 613struct tomoyo_domain_initializer_entry { 614 struct tomoyo_acl_head head; 615 bool is_not; /* True if this entry is "no_initialize_domain". */ 616 /* True if the domainname is tomoyo_get_last_name(). */ 617 bool is_last_name; 618 const struct tomoyo_path_info *domainname; /* This may be NULL */ 619 const struct tomoyo_path_info *program; 620}; 621 622/* 623 * tomoyo_domain_keeper_entry is a structure which is used for holding 624 * "keep_domain" and "no_keep_domain" entries. 625 * It has following fields. 626 * 627 * (1) "head" is "struct tomoyo_acl_head". 628 * (2) "is_not" is a bool which is true if "no_initialize_domain", false 629 * otherwise. 630 * (3) "is_last_name" is a bool which is true if "domainname" is "the last 631 * component of a domainname", false otherwise. 632 * (4) "domainname" which is "a domainname" or "the last component of a 633 * domainname". 634 * (5) "program" which is a program's pathname. 635 * This field is NULL if "from" clause is not specified. 636 */ 637struct tomoyo_domain_keeper_entry { 638 struct tomoyo_acl_head head; 639 bool is_not; /* True if this entry is "no_keep_domain". */ 640 /* True if the domainname is tomoyo_get_last_name(). */ 641 bool is_last_name; 642 const struct tomoyo_path_info *domainname; 643 const struct tomoyo_path_info *program; /* This may be NULL */ 644}; 645 646/* 647 * tomoyo_aggregator_entry is a structure which is used for holding 648 * "aggregator" entries. 649 * It has following fields. 650 * 651 * (1) "head" is "struct tomoyo_acl_head". 652 * (2) "original_name" which is originally requested name. 653 * (3) "aggregated_name" which is name to rewrite. 654 */ 655struct tomoyo_aggregator_entry { 656 struct tomoyo_acl_head head; 657 const struct tomoyo_path_info *original_name; 658 const struct tomoyo_path_info *aggregated_name; 659}; 660 661/* 662 * tomoyo_alias_entry is a structure which is used for holding "alias" entries. 663 * It has following fields. 664 * 665 * (1) "head" is "struct tomoyo_acl_head". 666 * (2) "original_name" which is a dereferenced pathname. 667 * (3) "aliased_name" which is a symlink's pathname. 668 */ 669struct tomoyo_alias_entry { 670 struct tomoyo_acl_head head; 671 const struct tomoyo_path_info *original_name; 672 const struct tomoyo_path_info *aliased_name; 673}; 674 675/* 676 * tomoyo_policy_manager_entry is a structure which is used for holding list of 677 * domainnames or programs which are permitted to modify configuration via 678 * /sys/kernel/security/tomoyo/ interface. 679 * It has following fields. 680 * 681 * (1) "head" is "struct tomoyo_acl_head". 682 * (2) "is_domain" is a bool which is true if "manager" is a domainname, false 683 * otherwise. 684 * (3) "manager" is a domainname or a program's pathname. 685 */ 686struct tomoyo_policy_manager_entry { 687 struct tomoyo_acl_head head; 688 bool is_domain; /* True if manager is a domainname. */ 689 /* A path to program or a domainname. */ 690 const struct tomoyo_path_info *manager; 691}; 692 693struct tomoyo_preference { 694 unsigned int learning_max_entry; 695 bool enforcing_verbose; 696 bool learning_verbose; 697 bool permissive_verbose; 698}; 699 700struct tomoyo_profile { 701 const struct tomoyo_path_info *comment; 702 struct tomoyo_preference *learning; 703 struct tomoyo_preference *permissive; 704 struct tomoyo_preference *enforcing; 705 struct tomoyo_preference preference; 706 u8 default_config; 707 u8 config[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX]; 708}; 709 710/********** Function prototypes. **********/ 711 712extern asmlinkage long sys_getpid(void); 713extern asmlinkage long sys_getppid(void); 714 715/* Check whether the given string starts with the given keyword. */ 716bool tomoyo_str_starts(char **src, const char *find); 717/* Get tomoyo_realpath() of current process. */ 718const char *tomoyo_get_exe(void); 719/* Format string. */ 720void tomoyo_normalize_line(unsigned char *buffer); 721/* Print warning or error message on console. */ 722void tomoyo_warn_log(struct tomoyo_request_info *r, const char *fmt, ...) 723 __attribute__ ((format(printf, 2, 3))); 724/* Check all profiles currently assigned to domains are defined. */ 725void tomoyo_check_profile(void); 726/* Open operation for /sys/kernel/security/tomoyo/ interface. */ 727int tomoyo_open_control(const u8 type, struct file *file); 728/* Close /sys/kernel/security/tomoyo/ interface. */ 729int tomoyo_close_control(struct file *file); 730/* Read operation for /sys/kernel/security/tomoyo/ interface. */ 731int tomoyo_read_control(struct file *file, char __user *buffer, 732 const int buffer_len); 733/* Write operation for /sys/kernel/security/tomoyo/ interface. */ 734int tomoyo_write_control(struct file *file, const char __user *buffer, 735 const int buffer_len); 736/* Check whether the domain has too many ACL entries to hold. */ 737bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r); 738/* Print out of memory warning message. */ 739void tomoyo_warn_oom(const char *function); 740/* Check whether the given name matches the given name_union. */ 741bool tomoyo_compare_name_union(const struct tomoyo_path_info *name, 742 const struct tomoyo_name_union *ptr); 743/* Check whether the given number matches the given number_union. */ 744bool tomoyo_compare_number_union(const unsigned long value, 745 const struct tomoyo_number_union *ptr); 746int tomoyo_get_mode(const u8 profile, const u8 index); 747/* Transactional sprintf() for policy dump. */ 748bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...) 749 __attribute__ ((format(printf, 2, 3))); 750/* Check whether the domainname is correct. */ 751bool tomoyo_correct_domain(const unsigned char *domainname); 752/* Check whether the token is correct. */ 753bool tomoyo_correct_path(const char *filename); 754bool tomoyo_correct_word(const char *string); 755/* Check whether the token can be a domainname. */ 756bool tomoyo_domain_def(const unsigned char *buffer); 757bool tomoyo_parse_name_union(const char *filename, 758 struct tomoyo_name_union *ptr); 759/* Check whether the given filename matches the given path_group. */ 760bool tomoyo_path_matches_group(const struct tomoyo_path_info *pathname, 761 const struct tomoyo_group *group); 762/* Check whether the given value matches the given number_group. */ 763bool tomoyo_number_matches_group(const unsigned long min, 764 const unsigned long max, 765 const struct tomoyo_group *group); 766/* Check whether the given filename matches the given pattern. */ 767bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename, 768 const struct tomoyo_path_info *pattern); 769 770bool tomoyo_print_number_union(struct tomoyo_io_buffer *head, 771 const struct tomoyo_number_union *ptr); 772bool tomoyo_parse_number_union(char *data, struct tomoyo_number_union *num); 773 774/* Read "aggregator" entry in exception policy. */ 775bool tomoyo_read_aggregator_policy(struct tomoyo_io_buffer *head); 776/* Read "alias" entry in exception policy. */ 777bool tomoyo_read_alias_policy(struct tomoyo_io_buffer *head); 778/* 779 * Read "initialize_domain" and "no_initialize_domain" entry 780 * in exception policy. 781 */ 782bool tomoyo_read_domain_initializer_policy(struct tomoyo_io_buffer *head); 783/* Read "keep_domain" and "no_keep_domain" entry in exception policy. */ 784bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head); 785/* Read "file_pattern" entry in exception policy. */ 786bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head); 787/* Read "path_group" entry in exception policy. */ 788bool tomoyo_read_path_group_policy(struct tomoyo_io_buffer *head); 789/* Read "number_group" entry in exception policy. */ 790bool tomoyo_read_number_group_policy(struct tomoyo_io_buffer *head); 791/* Read "allow_read" entry in exception policy. */ 792bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head); 793/* Read "deny_rewrite" entry in exception policy. */ 794bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head); 795/* Tokenize a line. */ 796bool tomoyo_tokenize(char *buffer, char *w[], size_t size); 797/* Write domain policy violation warning message to console? */ 798bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain); 799/* Get the last component of the given domainname. */ 800const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain); 801/* Fill "struct tomoyo_request_info". */ 802int tomoyo_init_request_info(struct tomoyo_request_info *r, 803 struct tomoyo_domain_info *domain, 804 const u8 index); 805/* Check permission for mount operation. */ 806int tomoyo_mount_permission(char *dev_name, struct path *path, char *type, 807 unsigned long flags, void *data_page); 808/* Create "aggregator" entry in exception policy. */ 809int tomoyo_write_aggregator_policy(char *data, const bool is_delete); 810/* Create "alias" entry in exception policy. */ 811int tomoyo_write_alias_policy(char *data, const bool is_delete); 812/* 813 * Create "initialize_domain" and "no_initialize_domain" entry 814 * in exception policy. 815 */ 816int tomoyo_write_domain_initializer_policy(char *data, const bool is_not, 817 const bool is_delete); 818/* Create "keep_domain" and "no_keep_domain" entry in exception policy. */ 819int tomoyo_write_domain_keeper_policy(char *data, const bool is_not, 820 const bool is_delete); 821/* 822 * Create "allow_read/write", "allow_execute", "allow_read", "allow_write", 823 * "allow_create", "allow_unlink", "allow_mkdir", "allow_rmdir", 824 * "allow_mkfifo", "allow_mksock", "allow_mkblock", "allow_mkchar", 825 * "allow_truncate", "allow_symlink", "allow_rewrite", "allow_rename" and 826 * "allow_link" entry in domain policy. 827 */ 828int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, 829 const bool is_delete); 830/* Create "allow_read" entry in exception policy. */ 831int tomoyo_write_globally_readable_policy(char *data, const bool is_delete); 832/* Create "allow_mount" entry in domain policy. */ 833int tomoyo_write_mount_policy(char *data, struct tomoyo_domain_info *domain, 834 const bool is_delete); 835/* Create "deny_rewrite" entry in exception policy. */ 836int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete); 837/* Create "file_pattern" entry in exception policy. */ 838int tomoyo_write_pattern_policy(char *data, const bool is_delete); 839/* Create "path_group" entry in exception policy. */ 840int tomoyo_write_path_group_policy(char *data, const bool is_delete); 841int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) 842 __attribute__ ((format(printf, 2, 3))); 843/* Create "number_group" entry in exception policy. */ 844int tomoyo_write_number_group_policy(char *data, const bool is_delete); 845/* Find a domain by the given name. */ 846struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname); 847/* Find or create a domain by the given name. */ 848struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char * 849 domainname, 850 const u8 profile); 851struct tomoyo_profile *tomoyo_profile(const u8 profile); 852/* Allocate memory for "struct tomoyo_path_group". */ 853struct tomoyo_group *tomoyo_get_path_group(const char *group_name); 854struct tomoyo_group *tomoyo_get_number_group(const char *group_name); 855 856/* Check mode for specified functionality. */ 857unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain, 858 const u8 index); 859/* Fill in "struct tomoyo_path_info" members. */ 860void tomoyo_fill_path_info(struct tomoyo_path_info *ptr); 861/* Run policy loader when /sbin/init starts. */ 862void tomoyo_load_policy(const char *filename); 863 864void tomoyo_put_number_union(struct tomoyo_number_union *ptr); 865 866/* Convert binary string to ascii string. */ 867char *tomoyo_encode(const char *str); 868 869/* 870 * Returns realpath(3) of the given pathname but ignores chroot'ed root. 871 * These functions use kzalloc(), so the caller must call kfree() 872 * if these functions didn't return NULL. 873 */ 874char *tomoyo_realpath(const char *pathname); 875/* 876 * Same with tomoyo_realpath() except that it doesn't follow the final symlink. 877 */ 878char *tomoyo_realpath_nofollow(const char *pathname); 879/* Same with tomoyo_realpath() except that the pathname is already solved. */ 880char *tomoyo_realpath_from_path(struct path *path); 881/* Get patterned pathname. */ 882const char *tomoyo_file_pattern(const struct tomoyo_path_info *filename); 883 884/* Check memory quota. */ 885bool tomoyo_memory_ok(void *ptr); 886void *tomoyo_commit_ok(void *data, const unsigned int size); 887 888/* 889 * Keep the given name on the RAM. 890 * The RAM is shared, so NEVER try to modify or kfree() the returned name. 891 */ 892const struct tomoyo_path_info *tomoyo_get_name(const char *name); 893 894/* Check for memory usage. */ 895void tomoyo_read_memory_counter(struct tomoyo_io_buffer *head); 896 897/* Set memory quota. */ 898int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head); 899 900/* Initialize mm related code. */ 901void __init tomoyo_mm_init(void); 902int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation, 903 const struct tomoyo_path_info *filename); 904int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, 905 struct path *path, const int flag); 906int tomoyo_path_number_perm(const u8 operation, struct path *path, 907 unsigned long number); 908int tomoyo_mkdev_perm(const u8 operation, struct path *path, 909 const unsigned int mode, unsigned int dev); 910int tomoyo_path_perm(const u8 operation, struct path *path); 911int tomoyo_path2_perm(const u8 operation, struct path *path1, 912 struct path *path2); 913int tomoyo_find_next_domain(struct linux_binprm *bprm); 914 915void tomoyo_print_ulong(char *buffer, const int buffer_len, 916 const unsigned long value, const u8 type); 917 918/* Drop refcount on tomoyo_name_union. */ 919void tomoyo_put_name_union(struct tomoyo_name_union *ptr); 920 921/* Run garbage collector. */ 922void tomoyo_run_gc(void); 923 924void tomoyo_memory_free(void *ptr); 925 926int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size, 927 bool is_delete, struct tomoyo_domain_info *domain, 928 bool (*check_duplicate) (const struct tomoyo_acl_info 929 *, 930 const struct tomoyo_acl_info 931 *), 932 bool (*merge_duplicate) (struct tomoyo_acl_info *, 933 struct tomoyo_acl_info *, 934 const bool)); 935int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size, 936 bool is_delete, struct list_head *list, 937 bool (*check_duplicate) (const struct tomoyo_acl_head 938 *, 939 const struct tomoyo_acl_head 940 *)); 941void tomoyo_check_acl(struct tomoyo_request_info *r, 942 bool (*check_entry) (const struct tomoyo_request_info *, 943 const struct tomoyo_acl_info *)); 944 945/********** External variable definitions. **********/ 946 947/* Lock for GC. */ 948extern struct srcu_struct tomoyo_ss; 949 950/* The list for "struct tomoyo_domain_info". */ 951extern struct list_head tomoyo_domain_list; 952 953extern struct list_head tomoyo_path_group_list; 954extern struct list_head tomoyo_number_group_list; 955extern struct list_head tomoyo_domain_initializer_list; 956extern struct list_head tomoyo_domain_keeper_list; 957extern struct list_head tomoyo_aggregator_list; 958extern struct list_head tomoyo_alias_list; 959extern struct list_head tomoyo_globally_readable_list; 960extern struct list_head tomoyo_pattern_list; 961extern struct list_head tomoyo_no_rewrite_list; 962extern struct list_head tomoyo_policy_manager_list; 963extern struct list_head tomoyo_name_list[TOMOYO_MAX_HASH]; 964 965/* Lock for protecting policy. */ 966extern struct mutex tomoyo_policy_lock; 967 968/* Has /sbin/init started? */ 969extern bool tomoyo_policy_loaded; 970 971/* The kernel's domain. */ 972extern struct tomoyo_domain_info tomoyo_kernel_domain; 973 974extern const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION]; 975extern const char *tomoyo_mkdev_keyword[TOMOYO_MAX_MKDEV_OPERATION]; 976extern const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION]; 977extern const char *tomoyo_path_number_keyword[TOMOYO_MAX_PATH_NUMBER_OPERATION]; 978 979extern unsigned int tomoyo_quota_for_query; 980extern unsigned int tomoyo_query_memory_size; 981 982/********** Inlined functions. **********/ 983 984static inline int tomoyo_read_lock(void) 985{ 986 return srcu_read_lock(&tomoyo_ss); 987} 988 989static inline void tomoyo_read_unlock(int idx) 990{ 991 srcu_read_unlock(&tomoyo_ss, idx); 992} 993 994/* strcmp() for "struct tomoyo_path_info" structure. */ 995static inline bool tomoyo_pathcmp(const struct tomoyo_path_info *a, 996 const struct tomoyo_path_info *b) 997{ 998 return a->hash != b->hash || strcmp(a->name, b->name); 999} 1000 1001/** 1002 * tomoyo_valid - Check whether the character is a valid char. 1003 * 1004 * @c: The character to check. 1005 * 1006 * Returns true if @c is a valid character, false otherwise. 1007 */ 1008static inline bool tomoyo_valid(const unsigned char c) 1009{ 1010 return c > ' ' && c < 127; 1011} 1012 1013/** 1014 * tomoyo_invalid - Check whether the character is an invalid char. 1015 * 1016 * @c: The character to check. 1017 * 1018 * Returns true if @c is an invalid character, false otherwise. 1019 */ 1020static inline bool tomoyo_invalid(const unsigned char c) 1021{ 1022 return c && (c <= ' ' || c >= 127); 1023} 1024 1025static inline void tomoyo_put_name(const struct tomoyo_path_info *name) 1026{ 1027 if (name) { 1028 struct tomoyo_name_entry *ptr = 1029 container_of(name, struct tomoyo_name_entry, entry); 1030 atomic_dec(&ptr->users); 1031 } 1032} 1033 1034static inline void tomoyo_put_group(struct tomoyo_group *group) 1035{ 1036 if (group) 1037 atomic_dec(&group->users); 1038} 1039 1040static inline struct tomoyo_domain_info *tomoyo_domain(void) 1041{ 1042 return current_cred()->security; 1043} 1044 1045static inline struct tomoyo_domain_info *tomoyo_real_domain(struct task_struct 1046 *task) 1047{ 1048 return task_cred_xxx(task, security); 1049} 1050 1051static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *p1, 1052 const struct tomoyo_acl_info *p2) 1053{ 1054 return p1->type == p2->type; 1055} 1056 1057static inline bool tomoyo_same_name_union 1058(const struct tomoyo_name_union *p1, const struct tomoyo_name_union *p2) 1059{ 1060 return p1->filename == p2->filename && p1->group == p2->group && 1061 p1->is_group == p2->is_group; 1062} 1063 1064static inline bool tomoyo_same_number_union 1065(const struct tomoyo_number_union *p1, const struct tomoyo_number_union *p2) 1066{ 1067 return p1->values[0] == p2->values[0] && p1->values[1] == p2->values[1] 1068 && p1->group == p2->group && p1->min_type == p2->min_type && 1069 p1->max_type == p2->max_type && p1->is_group == p2->is_group; 1070} 1071 1072/** 1073 * list_for_each_cookie - iterate over a list with cookie. 1074 * @pos: the &struct list_head to use as a loop cursor. 1075 * @cookie: the &struct list_head to use as a cookie. 1076 * @head: the head for your list. 1077 * 1078 * Same with list_for_each_rcu() except that this primitive uses @cookie 1079 * so that we can continue iteration. 1080 * @cookie must be NULL when iteration starts, and @cookie will become 1081 * NULL when iteration finishes. 1082 */ 1083#define list_for_each_cookie(pos, cookie, head) \ 1084 for (({ if (!cookie) \ 1085 cookie = head; }), \ 1086 pos = rcu_dereference((cookie)->next); \ 1087 prefetch(pos->next), pos != (head) || ((cookie) = NULL); \ 1088 (cookie) = pos, pos = rcu_dereference(pos->next)) 1089 1090#endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */ 1091