1 /** 2 * eCryptfs: Linux filesystem encryption layer 3 * Kernel declarations. 4 * 5 * Copyright (C) 1997-2003 Erez Zadok 6 * Copyright (C) 2001-2003 Stony Brook University 7 * Copyright (C) 2004-2008 International Business Machines Corp. 8 * Author(s): Michael A. Halcrow <[email protected]> 9 * Trevor S. Highland <[email protected]> 10 * Tyler Hicks <[email protected]> 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License as 14 * published by the Free Software Foundation; either version 2 of the 15 * License, or (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, but 18 * WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 20 * General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 25 * 02111-1307, USA. 26 */ 27 28 #ifndef ECRYPTFS_KERNEL_H 29 #define ECRYPTFS_KERNEL_H 30 31 #include <keys/user-type.h> 32 #include <linux/fs.h> 33 #include <linux/fs_stack.h> 34 #include <linux/namei.h> 35 #include <linux/scatterlist.h> 36 #include <linux/hash.h> 37 #include <linux/nsproxy.h> 38 #include <linux/backing-dev.h> 39 40 /* Version verification for shared data structures w/ userspace */ 41 #define ECRYPTFS_VERSION_MAJOR 0x00 42 #define ECRYPTFS_VERSION_MINOR 0x04 43 #define ECRYPTFS_SUPPORTED_FILE_VERSION 0x03 44 /* These flags indicate which features are supported by the kernel 45 * module; userspace tools such as the mount helper read 46 * ECRYPTFS_VERSIONING_MASK from a sysfs handle in order to determine 47 * how to behave. */ 48 #define ECRYPTFS_VERSIONING_PASSPHRASE 0x00000001 49 #define ECRYPTFS_VERSIONING_PUBKEY 0x00000002 50 #define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004 51 #define ECRYPTFS_VERSIONING_POLICY 0x00000008 52 #define ECRYPTFS_VERSIONING_XATTR 0x00000010 53 #define ECRYPTFS_VERSIONING_MULTKEY 0x00000020 54 #define ECRYPTFS_VERSIONING_DEVMISC 0x00000040 55 #define ECRYPTFS_VERSIONING_HMAC 0x00000080 56 #define ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION 0x00000100 57 #define ECRYPTFS_VERSIONING_GCM 0x00000200 58 #define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \ 59 | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \ 60 | ECRYPTFS_VERSIONING_PUBKEY \ 61 | ECRYPTFS_VERSIONING_XATTR \ 62 | ECRYPTFS_VERSIONING_MULTKEY \ 63 | ECRYPTFS_VERSIONING_DEVMISC \ 64 | ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION) 65 #define ECRYPTFS_MAX_PASSWORD_LENGTH 64 66 #define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH 67 #define ECRYPTFS_SALT_SIZE 8 68 #define ECRYPTFS_SALT_SIZE_HEX (ECRYPTFS_SALT_SIZE*2) 69 /* The original signature size is only for what is stored on disk; all 70 * in-memory representations are expanded hex, so it better adapted to 71 * be passed around or referenced on the command line */ 72 #define ECRYPTFS_SIG_SIZE 8 73 #define ECRYPTFS_SIG_SIZE_HEX (ECRYPTFS_SIG_SIZE*2) 74 #define ECRYPTFS_PASSWORD_SIG_SIZE ECRYPTFS_SIG_SIZE_HEX 75 #define ECRYPTFS_MAX_KEY_BYTES 64 76 #define ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 512 77 #define ECRYPTFS_DEFAULT_IV_BYTES 16 78 #define ECRYPTFS_FILE_VERSION 0x03 79 #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096 80 #define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192 81 #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32 82 #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ 83 #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3) 84 #define ECRYPTFS_MAX_PKI_NAME_BYTES 16 85 #define ECRYPTFS_DEFAULT_NUM_USERS 4 86 #define ECRYPTFS_MAX_NUM_USERS 32768 87 #define ECRYPTFS_XATTR_NAME "user.ecryptfs" 88 89 #define RFC2440_CIPHER_DES3_EDE 0x02 90 #define RFC2440_CIPHER_CAST_5 0x03 91 #define RFC2440_CIPHER_BLOWFISH 0x04 92 #define RFC2440_CIPHER_AES_128 0x07 93 #define RFC2440_CIPHER_AES_192 0x08 94 #define RFC2440_CIPHER_AES_256 0x09 95 #define RFC2440_CIPHER_TWOFISH 0x0a 96 #define RFC2440_CIPHER_CAST_6 0x0b 97 98 #define RFC2440_CIPHER_RSA 0x01 99 100 /** 101 * For convenience, we may need to pass around the encrypted session 102 * key between kernel and userspace because the authentication token 103 * may not be extractable. For example, the TPM may not release the 104 * private key, instead requiring the encrypted data and returning the 105 * decrypted data. 106 */ 107 struct ecryptfs_session_key { 108 #define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT 0x00000001 109 #define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT 0x00000002 110 #define ECRYPTFS_CONTAINS_DECRYPTED_KEY 0x00000004 111 #define ECRYPTFS_CONTAINS_ENCRYPTED_KEY 0x00000008 112 u32 flags; 113 u32 encrypted_key_size; 114 u32 decrypted_key_size; 115 u8 encrypted_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES]; 116 u8 decrypted_key[ECRYPTFS_MAX_KEY_BYTES]; 117 }; 118 119 struct ecryptfs_password { 120 u32 password_bytes; 121 s32 hash_algo; 122 u32 hash_iterations; 123 u32 session_key_encryption_key_bytes; 124 #define ECRYPTFS_PERSISTENT_PASSWORD 0x01 125 #define ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET 0x02 126 u32 flags; 127 /* Iterated-hash concatenation of salt and passphrase */ 128 u8 session_key_encryption_key[ECRYPTFS_MAX_KEY_BYTES]; 129 u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1]; 130 /* Always in expanded hex */ 131 u8 salt[ECRYPTFS_SALT_SIZE]; 132 }; 133 134 enum ecryptfs_token_types {ECRYPTFS_PASSWORD, ECRYPTFS_PRIVATE_KEY}; 135 136 struct ecryptfs_private_key { 137 u32 key_size; 138 u32 data_len; 139 u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1]; 140 char pki_type[ECRYPTFS_MAX_PKI_NAME_BYTES + 1]; 141 u8 data[]; 142 }; 143 144 /* May be a password or a private key */ 145 struct ecryptfs_auth_tok { 146 u16 version; /* 8-bit major and 8-bit minor */ 147 u16 token_type; 148 #define ECRYPTFS_ENCRYPT_ONLY 0x00000001 149 u32 flags; 150 struct ecryptfs_session_key session_key; 151 u8 reserved[32]; 152 union { 153 struct ecryptfs_password password; 154 struct ecryptfs_private_key private_key; 155 } token; 156 } __attribute__ ((packed)); 157 158 void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok); 159 extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size); 160 extern void ecryptfs_from_hex(char *dst, char *src, int dst_size); 161 162 struct ecryptfs_key_record { 163 unsigned char type; 164 size_t enc_key_size; 165 unsigned char sig[ECRYPTFS_SIG_SIZE]; 166 unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES]; 167 }; 168 169 struct ecryptfs_auth_tok_list { 170 struct ecryptfs_auth_tok *auth_tok; 171 struct list_head list; 172 }; 173 174 struct ecryptfs_crypt_stat; 175 struct ecryptfs_mount_crypt_stat; 176 177 struct ecryptfs_page_crypt_context { 178 struct page *page; 179 #define ECRYPTFS_PREPARE_COMMIT_MODE 0 180 #define ECRYPTFS_WRITEPAGE_MODE 1 181 unsigned int mode; 182 union { 183 struct file *lower_file; 184 struct writeback_control *wbc; 185 } param; 186 }; 187 188 static inline struct ecryptfs_auth_tok * 189 ecryptfs_get_key_payload_data(struct key *key) 190 { 191 return (struct ecryptfs_auth_tok *) 192 (((struct user_key_payload*)key->payload.data)->data); 193 } 194 195 #define ECRYPTFS_MAX_KEYSET_SIZE 1024 196 #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32 197 #define ECRYPTFS_MAX_NUM_ENC_KEYS 64 198 #define ECRYPTFS_MAX_IV_BYTES 16 /* 128 bits */ 199 #define ECRYPTFS_SALT_BYTES 2 200 #define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5 201 #define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8 /* 4*2 */ 202 #define ECRYPTFS_FILE_SIZE_BYTES (sizeof(u64)) 203 #define ECRYPTFS_DEFAULT_CIPHER "aes" 204 #define ECRYPTFS_DEFAULT_KEY_BYTES 16 205 #define ECRYPTFS_DEFAULT_HASH "md5" 206 #define ECRYPTFS_TAG_70_DIGEST ECRYPTFS_DEFAULT_HASH 207 #define ECRYPTFS_TAG_1_PACKET_TYPE 0x01 208 #define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C 209 #define ECRYPTFS_TAG_11_PACKET_TYPE 0xED 210 #define ECRYPTFS_TAG_64_PACKET_TYPE 0x40 211 #define ECRYPTFS_TAG_65_PACKET_TYPE 0x41 212 #define ECRYPTFS_TAG_66_PACKET_TYPE 0x42 213 #define ECRYPTFS_TAG_67_PACKET_TYPE 0x43 214 #define ECRYPTFS_TAG_70_PACKET_TYPE 0x46 /* FNEK-encrypted filename 215 * as dentry name */ 216 #define ECRYPTFS_TAG_71_PACKET_TYPE 0x47 /* FNEK-encrypted filename in 217 * metadata */ 218 #define ECRYPTFS_TAG_72_PACKET_TYPE 0x48 /* FEK-encrypted filename as 219 * dentry name */ 220 #define ECRYPTFS_TAG_73_PACKET_TYPE 0x49 /* FEK-encrypted filename as 221 * metadata */ 222 /* Constraint: ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES >= 223 * ECRYPTFS_MAX_IV_BYTES */ 224 #define ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES 16 225 #define ECRYPTFS_NON_NULL 0x42 /* A reasonable substitute for NULL */ 226 #define MD5_DIGEST_SIZE 16 227 #define ECRYPTFS_TAG_70_DIGEST_SIZE MD5_DIGEST_SIZE 228 #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FEK_ENCRYPTED." 229 #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX_SIZE 23 230 #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FNEK_ENCRYPTED." 231 #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE 24 232 #define ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN (18 + 1 + 4 + 1 + 32) 233 234 struct ecryptfs_key_sig { 235 struct list_head crypt_stat_list; 236 char keysig[ECRYPTFS_SIG_SIZE_HEX + 1]; 237 }; 238 239 struct ecryptfs_filename { 240 struct list_head crypt_stat_list; 241 #define ECRYPTFS_FILENAME_CONTAINS_DECRYPTED 0x00000001 242 u32 flags; 243 u32 seq_no; 244 char *filename; 245 char *encrypted_filename; 246 size_t filename_size; 247 size_t encrypted_filename_size; 248 char fnek_sig[ECRYPTFS_SIG_SIZE_HEX]; 249 char dentry_name[ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN + 1]; 250 }; 251 252 /** 253 * This is the primary struct associated with each encrypted file. 254 * 255 * TODO: cache align/pack? 256 */ 257 struct ecryptfs_crypt_stat { 258 #define ECRYPTFS_STRUCT_INITIALIZED 0x00000001 259 #define ECRYPTFS_POLICY_APPLIED 0x00000002 260 #define ECRYPTFS_ENCRYPTED 0x00000004 261 #define ECRYPTFS_SECURITY_WARNING 0x00000008 262 #define ECRYPTFS_ENABLE_HMAC 0x00000010 263 #define ECRYPTFS_ENCRYPT_IV_PAGES 0x00000020 264 #define ECRYPTFS_KEY_VALID 0x00000040 265 #define ECRYPTFS_METADATA_IN_XATTR 0x00000080 266 #define ECRYPTFS_VIEW_AS_ENCRYPTED 0x00000100 267 #define ECRYPTFS_KEY_SET 0x00000200 268 #define ECRYPTFS_ENCRYPT_FILENAMES 0x00000400 269 #define ECRYPTFS_ENCFN_USE_MOUNT_FNEK 0x00000800 270 #define ECRYPTFS_ENCFN_USE_FEK 0x00001000 271 #define ECRYPTFS_UNLINK_SIGS 0x00002000 272 u32 flags; 273 unsigned int file_version; 274 size_t iv_bytes; 275 size_t metadata_size; 276 size_t extent_size; /* Data extent size; default is 4096 */ 277 size_t key_size; 278 size_t extent_shift; 279 unsigned int extent_mask; 280 struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 281 struct crypto_blkcipher *tfm; 282 struct crypto_hash *hash_tfm; /* Crypto context for generating 283 * the initialization vectors */ 284 unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE]; 285 unsigned char key[ECRYPTFS_MAX_KEY_BYTES]; 286 unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES]; 287 struct list_head keysig_list; 288 struct mutex keysig_list_mutex; 289 struct mutex cs_tfm_mutex; 290 struct mutex cs_hash_tfm_mutex; 291 struct mutex cs_mutex; 292 }; 293 294 /* inode private data. */ 295 struct ecryptfs_inode_info { 296 struct inode vfs_inode; 297 struct inode *wii_inode; 298 struct file *lower_file; 299 struct ecryptfs_crypt_stat crypt_stat; 300 }; 301 302 /* dentry private data. Each dentry must keep track of a lower 303 * vfsmount too. */ 304 struct ecryptfs_dentry_info { 305 struct path lower_path; 306 struct ecryptfs_crypt_stat *crypt_stat; 307 }; 308 309 /** 310 * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint 311 * @flags: Status flags 312 * @mount_crypt_stat_list: These auth_toks hang off the mount-wide 313 * cryptographic context. Every time a new 314 * inode comes into existence, eCryptfs copies 315 * the auth_toks on that list to the set of 316 * auth_toks on the inode's crypt_stat 317 * @global_auth_tok_key: The key from the user's keyring for the sig 318 * @global_auth_tok: The key contents 319 * @sig: The key identifier 320 * 321 * ecryptfs_global_auth_tok structs refer to authentication token keys 322 * in the user keyring that apply to newly created files. A list of 323 * these objects hangs off of the mount_crypt_stat struct for any 324 * given eCryptfs mount. This struct maintains a reference to both the 325 * key contents and the key itself so that the key can be put on 326 * unmount. 327 */ 328 struct ecryptfs_global_auth_tok { 329 #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001 330 #define ECRYPTFS_AUTH_TOK_FNEK 0x00000002 331 u32 flags; 332 struct list_head mount_crypt_stat_list; 333 struct key *global_auth_tok_key; 334 unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1]; 335 }; 336 337 /** 338 * ecryptfs_key_tfm - Persistent key tfm 339 * @key_tfm: crypto API handle to the key 340 * @key_size: Key size in bytes 341 * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is 342 * using the persistent TFM at any point in time 343 * @key_tfm_list: Handle to hang this off the module-wide TFM list 344 * @cipher_name: String name for the cipher for this TFM 345 * 346 * Typically, eCryptfs will use the same ciphers repeatedly throughout 347 * the course of its operations. In order to avoid unnecessarily 348 * destroying and initializing the same cipher repeatedly, eCryptfs 349 * keeps a list of crypto API contexts around to use when needed. 350 */ 351 struct ecryptfs_key_tfm { 352 struct crypto_blkcipher *key_tfm; 353 size_t key_size; 354 struct mutex key_tfm_mutex; 355 struct list_head key_tfm_list; 356 unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; 357 }; 358 359 extern struct mutex key_tfm_list_mutex; 360 361 /** 362 * This struct is to enable a mount-wide passphrase/salt combo. This 363 * is more or less a stopgap to provide similar functionality to other 364 * crypto filesystems like EncFS or CFS until full policy support is 365 * implemented in eCryptfs. 366 */ 367 struct ecryptfs_mount_crypt_stat { 368 /* Pointers to memory we do not own, do not free these */ 369 #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001 370 #define ECRYPTFS_XATTR_METADATA_ENABLED 0x00000002 371 #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED 0x00000004 372 #define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED 0x00000008 373 #define ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES 0x00000010 374 #define ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK 0x00000020 375 #define ECRYPTFS_GLOBAL_ENCFN_USE_FEK 0x00000040 376 #define ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY 0x00000080 377 u32 flags; 378 struct list_head global_auth_tok_list; 379 struct mutex global_auth_tok_list_mutex; 380 size_t global_default_cipher_key_size; 381 size_t global_default_fn_cipher_key_bytes; 382 unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE 383 + 1]; 384 unsigned char global_default_fn_cipher_name[ 385 ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; 386 char global_default_fnek_sig[ECRYPTFS_SIG_SIZE_HEX + 1]; 387 }; 388 389 /* superblock private data. */ 390 struct ecryptfs_sb_info { 391 struct super_block *wsi_sb; 392 struct ecryptfs_mount_crypt_stat mount_crypt_stat; 393 struct backing_dev_info bdi; 394 }; 395 396 /* file private data. */ 397 struct ecryptfs_file_info { 398 struct file *wfi_file; 399 struct ecryptfs_crypt_stat *crypt_stat; 400 }; 401 402 /* auth_tok <=> encrypted_session_key mappings */ 403 struct ecryptfs_auth_tok_list_item { 404 unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES]; 405 struct list_head list; 406 struct ecryptfs_auth_tok auth_tok; 407 }; 408 409 struct ecryptfs_message { 410 /* Can never be greater than ecryptfs_message_buf_len */ 411 /* Used to find the parent msg_ctx */ 412 /* Inherits from msg_ctx->index */ 413 u32 index; 414 u32 data_len; 415 u8 data[]; 416 }; 417 418 struct ecryptfs_msg_ctx { 419 #define ECRYPTFS_MSG_CTX_STATE_FREE 0x01 420 #define ECRYPTFS_MSG_CTX_STATE_PENDING 0x02 421 #define ECRYPTFS_MSG_CTX_STATE_DONE 0x03 422 #define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04 423 u8 state; 424 #define ECRYPTFS_MSG_HELO 100 425 #define ECRYPTFS_MSG_QUIT 101 426 #define ECRYPTFS_MSG_REQUEST 102 427 #define ECRYPTFS_MSG_RESPONSE 103 428 u8 type; 429 u32 index; 430 /* Counter converts to a sequence number. Each message sent 431 * out for which we expect a response has an associated 432 * sequence number. The response must have the same sequence 433 * number as the counter for the msg_stc for the message to be 434 * valid. */ 435 u32 counter; 436 size_t msg_size; 437 struct ecryptfs_message *msg; 438 struct task_struct *task; 439 struct list_head node; 440 struct list_head daemon_out_list; 441 struct mutex mux; 442 }; 443 444 struct ecryptfs_daemon; 445 446 struct ecryptfs_daemon { 447 #define ECRYPTFS_DAEMON_IN_READ 0x00000001 448 #define ECRYPTFS_DAEMON_IN_POLL 0x00000002 449 #define ECRYPTFS_DAEMON_ZOMBIE 0x00000004 450 #define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008 451 u32 flags; 452 u32 num_queued_msg_ctx; 453 struct pid *pid; 454 uid_t euid; 455 struct user_namespace *user_ns; 456 struct task_struct *task; 457 struct mutex mux; 458 struct list_head msg_ctx_out_queue; 459 wait_queue_head_t wait; 460 struct hlist_node euid_chain; 461 }; 462 463 extern struct mutex ecryptfs_daemon_hash_mux; 464 465 static inline size_t 466 ecryptfs_lower_header_size(struct ecryptfs_crypt_stat *crypt_stat) 467 { 468 if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) 469 return 0; 470 return crypt_stat->metadata_size; 471 } 472 473 static inline struct ecryptfs_file_info * 474 ecryptfs_file_to_private(struct file *file) 475 { 476 return file->private_data; 477 } 478 479 static inline void 480 ecryptfs_set_file_private(struct file *file, 481 struct ecryptfs_file_info *file_info) 482 { 483 file->private_data = file_info; 484 } 485 486 static inline struct file *ecryptfs_file_to_lower(struct file *file) 487 { 488 return ((struct ecryptfs_file_info *)file->private_data)->wfi_file; 489 } 490 491 static inline void 492 ecryptfs_set_file_lower(struct file *file, struct file *lower_file) 493 { 494 ((struct ecryptfs_file_info *)file->private_data)->wfi_file = 495 lower_file; 496 } 497 498 static inline struct ecryptfs_inode_info * 499 ecryptfs_inode_to_private(struct inode *inode) 500 { 501 return container_of(inode, struct ecryptfs_inode_info, vfs_inode); 502 } 503 504 static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode) 505 { 506 return ecryptfs_inode_to_private(inode)->wii_inode; 507 } 508 509 static inline void 510 ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode) 511 { 512 ecryptfs_inode_to_private(inode)->wii_inode = lower_inode; 513 } 514 515 static inline struct ecryptfs_sb_info * 516 ecryptfs_superblock_to_private(struct super_block *sb) 517 { 518 return (struct ecryptfs_sb_info *)sb->s_fs_info; 519 } 520 521 static inline void 522 ecryptfs_set_superblock_private(struct super_block *sb, 523 struct ecryptfs_sb_info *sb_info) 524 { 525 sb->s_fs_info = sb_info; 526 } 527 528 static inline struct super_block * 529 ecryptfs_superblock_to_lower(struct super_block *sb) 530 { 531 return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb; 532 } 533 534 static inline void 535 ecryptfs_set_superblock_lower(struct super_block *sb, 536 struct super_block *lower_sb) 537 { 538 ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb; 539 } 540 541 static inline struct ecryptfs_dentry_info * 542 ecryptfs_dentry_to_private(struct dentry *dentry) 543 { 544 return (struct ecryptfs_dentry_info *)dentry->d_fsdata; 545 } 546 547 static inline void 548 ecryptfs_set_dentry_private(struct dentry *dentry, 549 struct ecryptfs_dentry_info *dentry_info) 550 { 551 dentry->d_fsdata = dentry_info; 552 } 553 554 static inline struct dentry * 555 ecryptfs_dentry_to_lower(struct dentry *dentry) 556 { 557 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry; 558 } 559 560 static inline void 561 ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry) 562 { 563 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry = 564 lower_dentry; 565 } 566 567 static inline struct vfsmount * 568 ecryptfs_dentry_to_lower_mnt(struct dentry *dentry) 569 { 570 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt; 571 } 572 573 static inline void 574 ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt) 575 { 576 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt = 577 lower_mnt; 578 } 579 580 #define ecryptfs_printk(type, fmt, arg...) \ 581 __ecryptfs_printk(type "%s: " fmt, __func__, ## arg); 582 __attribute__ ((format(printf, 1, 2))) 583 void __ecryptfs_printk(const char *fmt, ...); 584 585 extern const struct file_operations ecryptfs_main_fops; 586 extern const struct file_operations ecryptfs_dir_fops; 587 extern const struct inode_operations ecryptfs_main_iops; 588 extern const struct inode_operations ecryptfs_dir_iops; 589 extern const struct inode_operations ecryptfs_symlink_iops; 590 extern const struct super_operations ecryptfs_sops; 591 extern const struct dentry_operations ecryptfs_dops; 592 extern const struct address_space_operations ecryptfs_aops; 593 extern int ecryptfs_verbosity; 594 extern unsigned int ecryptfs_message_buf_len; 595 extern signed long ecryptfs_message_wait_timeout; 596 extern unsigned int ecryptfs_number_of_users; 597 598 extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache; 599 extern struct kmem_cache *ecryptfs_file_info_cache; 600 extern struct kmem_cache *ecryptfs_dentry_info_cache; 601 extern struct kmem_cache *ecryptfs_inode_info_cache; 602 extern struct kmem_cache *ecryptfs_sb_info_cache; 603 extern struct kmem_cache *ecryptfs_header_cache_1; 604 extern struct kmem_cache *ecryptfs_header_cache_2; 605 extern struct kmem_cache *ecryptfs_xattr_cache; 606 extern struct kmem_cache *ecryptfs_key_record_cache; 607 extern struct kmem_cache *ecryptfs_key_sig_cache; 608 extern struct kmem_cache *ecryptfs_global_auth_tok_cache; 609 extern struct kmem_cache *ecryptfs_key_tfm_cache; 610 extern struct kmem_cache *ecryptfs_open_req_cache; 611 612 struct ecryptfs_open_req { 613 #define ECRYPTFS_REQ_PROCESSED 0x00000001 614 #define ECRYPTFS_REQ_DROPPED 0x00000002 615 #define ECRYPTFS_REQ_ZOMBIE 0x00000004 616 u32 flags; 617 struct file **lower_file; 618 struct dentry *lower_dentry; 619 struct vfsmount *lower_mnt; 620 wait_queue_head_t wait; 621 struct mutex mux; 622 struct list_head kthread_ctl_list; 623 }; 624 625 #define ECRYPTFS_INTERPOSE_FLAG_D_ADD 0x00000001 626 int ecryptfs_interpose(struct dentry *hidden_dentry, 627 struct dentry *this_dentry, struct super_block *sb, 628 u32 flags); 629 int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, 630 struct dentry *lower_dentry, 631 struct inode *ecryptfs_dir_inode); 632 int ecryptfs_decode_and_decrypt_filename(char **decrypted_name, 633 size_t *decrypted_name_size, 634 struct dentry *ecryptfs_dentry, 635 const char *name, size_t name_size); 636 int ecryptfs_fill_zeros(struct file *file, loff_t new_length); 637 int ecryptfs_encrypt_and_encode_filename( 638 char **encoded_name, 639 size_t *encoded_name_size, 640 struct ecryptfs_crypt_stat *crypt_stat, 641 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, 642 const char *name, size_t name_size); 643 struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry); 644 void ecryptfs_dump_hex(char *data, int bytes); 645 int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg, 646 int sg_size); 647 int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat); 648 void ecryptfs_rotate_iv(unsigned char *iv); 649 void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); 650 void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); 651 void ecryptfs_destroy_mount_crypt_stat( 652 struct ecryptfs_mount_crypt_stat *mount_crypt_stat); 653 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat); 654 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode); 655 int ecryptfs_encrypt_page(struct page *page); 656 int ecryptfs_decrypt_page(struct page *page); 657 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry); 658 int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry); 659 int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry); 660 void ecryptfs_write_crypt_stat_flags(char *page_virt, 661 struct ecryptfs_crypt_stat *crypt_stat, 662 size_t *written); 663 int ecryptfs_read_and_validate_header_region(char *data, 664 struct inode *ecryptfs_inode); 665 int ecryptfs_read_and_validate_xattr_region(char *page_virt, 666 struct dentry *ecryptfs_dentry); 667 u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes); 668 int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code); 669 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat); 670 int ecryptfs_generate_key_packet_set(char *dest_base, 671 struct ecryptfs_crypt_stat *crypt_stat, 672 struct dentry *ecryptfs_dentry, 673 size_t *len, size_t max); 674 int 675 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat, 676 unsigned char *src, struct dentry *ecryptfs_dentry); 677 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length); 678 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode); 679 int ecryptfs_inode_set(struct inode *inode, void *lower_inode); 680 void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode); 681 ssize_t 682 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 683 void *value, size_t size); 684 int 685 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 686 size_t size, int flags); 687 int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode); 688 int ecryptfs_process_helo(uid_t euid, struct user_namespace *user_ns, 689 struct pid *pid); 690 int ecryptfs_process_quit(uid_t euid, struct user_namespace *user_ns, 691 struct pid *pid); 692 int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid, 693 struct user_namespace *user_ns, struct pid *pid, 694 u32 seq); 695 int ecryptfs_send_message(char *data, int data_len, 696 struct ecryptfs_msg_ctx **msg_ctx); 697 int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx, 698 struct ecryptfs_message **emsg); 699 int ecryptfs_init_messaging(void); 700 void ecryptfs_release_messaging(void); 701 702 void 703 ecryptfs_write_header_metadata(char *virt, 704 struct ecryptfs_crypt_stat *crypt_stat, 705 size_t *written); 706 int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig); 707 int 708 ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat, 709 char *sig, u32 global_auth_tok_flags); 710 int ecryptfs_get_global_auth_tok_for_sig( 711 struct ecryptfs_global_auth_tok **global_auth_tok, 712 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig); 713 int 714 ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name, 715 size_t key_size); 716 int ecryptfs_init_crypto(void); 717 int ecryptfs_destroy_crypto(void); 718 int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm); 719 int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm, 720 struct mutex **tfm_mutex, 721 char *cipher_name); 722 int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key, 723 struct ecryptfs_auth_tok **auth_tok, 724 char *sig); 725 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data, 726 loff_t offset, size_t size); 727 int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode, 728 struct page *page_for_lower, 729 size_t offset_in_page, size_t size); 730 int ecryptfs_write(struct inode *inode, char *data, loff_t offset, size_t size); 731 int ecryptfs_read_lower(char *data, loff_t offset, size_t size, 732 struct inode *ecryptfs_inode); 733 int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs, 734 pgoff_t page_index, 735 size_t offset_in_page, size_t size, 736 struct inode *ecryptfs_inode); 737 struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index); 738 int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon); 739 int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon, uid_t euid, 740 struct user_namespace *user_ns); 741 int ecryptfs_parse_packet_length(unsigned char *data, size_t *size, 742 size_t *length_size); 743 int ecryptfs_write_packet_length(char *dest, size_t size, 744 size_t *packet_size_length); 745 int ecryptfs_init_ecryptfs_miscdev(void); 746 void ecryptfs_destroy_ecryptfs_miscdev(void); 747 int ecryptfs_send_miscdev(char *data, size_t data_size, 748 struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type, 749 u16 msg_flags, struct ecryptfs_daemon *daemon); 750 void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx); 751 int 752 ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, uid_t euid, 753 struct user_namespace *user_ns, struct pid *pid); 754 int ecryptfs_init_kthread(void); 755 void ecryptfs_destroy_kthread(void); 756 int ecryptfs_privileged_open(struct file **lower_file, 757 struct dentry *lower_dentry, 758 struct vfsmount *lower_mnt, 759 const struct cred *cred); 760 int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry); 761 int 762 ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes, 763 size_t *packet_size, 764 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, 765 char *filename, size_t filename_size); 766 int 767 ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size, 768 size_t *packet_size, 769 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, 770 char *data, size_t max_packet_size); 771 int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat, 772 loff_t offset); 773 774 #endif /* #ifndef ECRYPTFS_KERNEL_H */ 775