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) 2004-2007 International Business Machines Corp. 8 * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> 9 * Trevor S. Highland <trevor.highland@gmail.com> 10 * Tyler Hicks <tyhicks@ou.edu> 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 38 /* Version verification for shared data structures w/ userspace */ 39 #define ECRYPTFS_VERSION_MAJOR 0x00 40 #define ECRYPTFS_VERSION_MINOR 0x04 41 #define ECRYPTFS_SUPPORTED_FILE_VERSION 0x03 42 /* These flags indicate which features are supported by the kernel 43 * module; userspace tools such as the mount helper read 44 * ECRYPTFS_VERSIONING_MASK from a sysfs handle in order to determine 45 * how to behave. */ 46 #define ECRYPTFS_VERSIONING_PASSPHRASE 0x00000001 47 #define ECRYPTFS_VERSIONING_PUBKEY 0x00000002 48 #define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004 49 #define ECRYPTFS_VERSIONING_POLICY 0x00000008 50 #define ECRYPTFS_VERSIONING_XATTR 0x00000010 51 #define ECRYPTFS_VERSIONING_MULTKEY 0x00000020 52 #define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \ 53 | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \ 54 | ECRYPTFS_VERSIONING_PUBKEY \ 55 | ECRYPTFS_VERSIONING_XATTR \ 56 | ECRYPTFS_VERSIONING_MULTKEY) 57 #define ECRYPTFS_MAX_PASSWORD_LENGTH 64 58 #define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH 59 #define ECRYPTFS_SALT_SIZE 8 60 #define ECRYPTFS_SALT_SIZE_HEX (ECRYPTFS_SALT_SIZE*2) 61 /* The original signature size is only for what is stored on disk; all 62 * in-memory representations are expanded hex, so it better adapted to 63 * be passed around or referenced on the command line */ 64 #define ECRYPTFS_SIG_SIZE 8 65 #define ECRYPTFS_SIG_SIZE_HEX (ECRYPTFS_SIG_SIZE*2) 66 #define ECRYPTFS_PASSWORD_SIG_SIZE ECRYPTFS_SIG_SIZE_HEX 67 #define ECRYPTFS_MAX_KEY_BYTES 64 68 #define ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 512 69 #define ECRYPTFS_DEFAULT_IV_BYTES 16 70 #define ECRYPTFS_FILE_VERSION 0x03 71 #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096 72 #define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192 73 #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32 74 #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ 75 #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3) 76 #define ECRYPTFS_NLMSG_HELO 100 77 #define ECRYPTFS_NLMSG_QUIT 101 78 #define ECRYPTFS_NLMSG_REQUEST 102 79 #define ECRYPTFS_NLMSG_RESPONSE 103 80 #define ECRYPTFS_MAX_PKI_NAME_BYTES 16 81 #define ECRYPTFS_DEFAULT_NUM_USERS 4 82 #define ECRYPTFS_MAX_NUM_USERS 32768 83 #define ECRYPTFS_TRANSPORT_NETLINK 0 84 #define ECRYPTFS_TRANSPORT_CONNECTOR 1 85 #define ECRYPTFS_TRANSPORT_RELAYFS 2 86 #define ECRYPTFS_DEFAULT_TRANSPORT ECRYPTFS_TRANSPORT_NETLINK 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_SUPER_MAGIC 0xf15f 196 #define ECRYPTFS_MAX_KEYSET_SIZE 1024 197 #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32 198 #define ECRYPTFS_MAX_NUM_ENC_KEYS 64 199 #define ECRYPTFS_MAX_IV_BYTES 16 /* 128 bits */ 200 #define ECRYPTFS_SALT_BYTES 2 201 #define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5 202 #define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8 /* 4*2 */ 203 #define ECRYPTFS_FILE_SIZE_BYTES (sizeof(u64)) 204 #define ECRYPTFS_DEFAULT_CIPHER "aes" 205 #define ECRYPTFS_DEFAULT_KEY_BYTES 16 206 #define ECRYPTFS_DEFAULT_HASH "md5" 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 MD5_DIGEST_SIZE 16 215 216 struct ecryptfs_key_sig { 217 struct list_head crypt_stat_list; 218 char keysig[ECRYPTFS_SIG_SIZE_HEX]; 219 }; 220 221 /** 222 * This is the primary struct associated with each encrypted file. 223 * 224 * TODO: cache align/pack? 225 */ 226 struct ecryptfs_crypt_stat { 227 #define ECRYPTFS_STRUCT_INITIALIZED 0x00000001 228 #define ECRYPTFS_POLICY_APPLIED 0x00000002 229 #define ECRYPTFS_NEW_FILE 0x00000004 230 #define ECRYPTFS_ENCRYPTED 0x00000008 231 #define ECRYPTFS_SECURITY_WARNING 0x00000010 232 #define ECRYPTFS_ENABLE_HMAC 0x00000020 233 #define ECRYPTFS_ENCRYPT_IV_PAGES 0x00000040 234 #define ECRYPTFS_KEY_VALID 0x00000080 235 #define ECRYPTFS_METADATA_IN_XATTR 0x00000100 236 #define ECRYPTFS_VIEW_AS_ENCRYPTED 0x00000200 237 #define ECRYPTFS_KEY_SET 0x00000400 238 u32 flags; 239 unsigned int file_version; 240 size_t iv_bytes; 241 size_t num_header_bytes_at_front; 242 size_t extent_size; /* Data extent size; default is 4096 */ 243 size_t key_size; 244 size_t extent_shift; 245 unsigned int extent_mask; 246 struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 247 struct crypto_blkcipher *tfm; 248 struct crypto_hash *hash_tfm; /* Crypto context for generating 249 * the initialization vectors */ 250 unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE]; 251 unsigned char key[ECRYPTFS_MAX_KEY_BYTES]; 252 unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES]; 253 struct list_head keysig_list; 254 struct mutex keysig_list_mutex; 255 struct mutex cs_tfm_mutex; 256 struct mutex cs_hash_tfm_mutex; 257 struct mutex cs_mutex; 258 }; 259 260 /* inode private data. */ 261 struct ecryptfs_inode_info { 262 struct inode vfs_inode; 263 struct inode *wii_inode; 264 struct file *lower_file; 265 struct mutex lower_file_mutex; 266 struct ecryptfs_crypt_stat crypt_stat; 267 }; 268 269 /* dentry private data. Each dentry must keep track of a lower 270 * vfsmount too. */ 271 struct ecryptfs_dentry_info { 272 struct path lower_path; 273 struct ecryptfs_crypt_stat *crypt_stat; 274 }; 275 276 /** 277 * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint 278 * @flags: Status flags 279 * @mount_crypt_stat_list: These auth_toks hang off the mount-wide 280 * cryptographic context. Every time a new 281 * inode comes into existence, eCryptfs copies 282 * the auth_toks on that list to the set of 283 * auth_toks on the inode's crypt_stat 284 * @global_auth_tok_key: The key from the user's keyring for the sig 285 * @global_auth_tok: The key contents 286 * @sig: The key identifier 287 * 288 * ecryptfs_global_auth_tok structs refer to authentication token keys 289 * in the user keyring that apply to newly created files. A list of 290 * these objects hangs off of the mount_crypt_stat struct for any 291 * given eCryptfs mount. This struct maintains a reference to both the 292 * key contents and the key itself so that the key can be put on 293 * unmount. 294 */ 295 struct ecryptfs_global_auth_tok { 296 #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001 297 u32 flags; 298 struct list_head mount_crypt_stat_list; 299 struct key *global_auth_tok_key; 300 struct ecryptfs_auth_tok *global_auth_tok; 301 unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1]; 302 }; 303 304 /** 305 * ecryptfs_key_tfm - Persistent key tfm 306 * @key_tfm: crypto API handle to the key 307 * @key_size: Key size in bytes 308 * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is 309 * using the persistent TFM at any point in time 310 * @key_tfm_list: Handle to hang this off the module-wide TFM list 311 * @cipher_name: String name for the cipher for this TFM 312 * 313 * Typically, eCryptfs will use the same ciphers repeatedly throughout 314 * the course of its operations. In order to avoid unnecessarily 315 * destroying and initializing the same cipher repeatedly, eCryptfs 316 * keeps a list of crypto API contexts around to use when needed. 317 */ 318 struct ecryptfs_key_tfm { 319 struct crypto_blkcipher *key_tfm; 320 size_t key_size; 321 struct mutex key_tfm_mutex; 322 struct list_head key_tfm_list; 323 unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; 324 }; 325 326 extern struct mutex key_tfm_list_mutex; 327 328 /** 329 * This struct is to enable a mount-wide passphrase/salt combo. This 330 * is more or less a stopgap to provide similar functionality to other 331 * crypto filesystems like EncFS or CFS until full policy support is 332 * implemented in eCryptfs. 333 */ 334 struct ecryptfs_mount_crypt_stat { 335 /* Pointers to memory we do not own, do not free these */ 336 #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001 337 #define ECRYPTFS_XATTR_METADATA_ENABLED 0x00000002 338 #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED 0x00000004 339 #define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED 0x00000008 340 u32 flags; 341 struct list_head global_auth_tok_list; 342 struct mutex global_auth_tok_list_mutex; 343 size_t num_global_auth_toks; 344 size_t global_default_cipher_key_size; 345 unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE 346 + 1]; 347 }; 348 349 /* superblock private data. */ 350 struct ecryptfs_sb_info { 351 struct super_block *wsi_sb; 352 struct ecryptfs_mount_crypt_stat mount_crypt_stat; 353 }; 354 355 /* file private data. */ 356 struct ecryptfs_file_info { 357 struct file *wfi_file; 358 struct ecryptfs_crypt_stat *crypt_stat; 359 }; 360 361 /* auth_tok <=> encrypted_session_key mappings */ 362 struct ecryptfs_auth_tok_list_item { 363 unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES]; 364 struct list_head list; 365 struct ecryptfs_auth_tok auth_tok; 366 }; 367 368 struct ecryptfs_message { 369 u32 index; 370 u32 data_len; 371 u8 data[]; 372 }; 373 374 struct ecryptfs_msg_ctx { 375 #define ECRYPTFS_MSG_CTX_STATE_FREE 0x0001 376 #define ECRYPTFS_MSG_CTX_STATE_PENDING 0x0002 377 #define ECRYPTFS_MSG_CTX_STATE_DONE 0x0003 378 u32 state; 379 unsigned int index; 380 unsigned int counter; 381 struct ecryptfs_message *msg; 382 struct task_struct *task; 383 struct list_head node; 384 struct mutex mux; 385 }; 386 387 extern unsigned int ecryptfs_transport; 388 389 struct ecryptfs_daemon_id { 390 pid_t pid; 391 uid_t uid; 392 struct hlist_node id_chain; 393 }; 394 395 static inline struct ecryptfs_file_info * 396 ecryptfs_file_to_private(struct file *file) 397 { 398 return (struct ecryptfs_file_info *)file->private_data; 399 } 400 401 static inline void 402 ecryptfs_set_file_private(struct file *file, 403 struct ecryptfs_file_info *file_info) 404 { 405 file->private_data = file_info; 406 } 407 408 static inline struct file *ecryptfs_file_to_lower(struct file *file) 409 { 410 return ((struct ecryptfs_file_info *)file->private_data)->wfi_file; 411 } 412 413 static inline void 414 ecryptfs_set_file_lower(struct file *file, struct file *lower_file) 415 { 416 ((struct ecryptfs_file_info *)file->private_data)->wfi_file = 417 lower_file; 418 } 419 420 static inline struct ecryptfs_inode_info * 421 ecryptfs_inode_to_private(struct inode *inode) 422 { 423 return container_of(inode, struct ecryptfs_inode_info, vfs_inode); 424 } 425 426 static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode) 427 { 428 return ecryptfs_inode_to_private(inode)->wii_inode; 429 } 430 431 static inline void 432 ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode) 433 { 434 ecryptfs_inode_to_private(inode)->wii_inode = lower_inode; 435 } 436 437 static inline struct ecryptfs_sb_info * 438 ecryptfs_superblock_to_private(struct super_block *sb) 439 { 440 return (struct ecryptfs_sb_info *)sb->s_fs_info; 441 } 442 443 static inline void 444 ecryptfs_set_superblock_private(struct super_block *sb, 445 struct ecryptfs_sb_info *sb_info) 446 { 447 sb->s_fs_info = sb_info; 448 } 449 450 static inline struct super_block * 451 ecryptfs_superblock_to_lower(struct super_block *sb) 452 { 453 return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb; 454 } 455 456 static inline void 457 ecryptfs_set_superblock_lower(struct super_block *sb, 458 struct super_block *lower_sb) 459 { 460 ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb; 461 } 462 463 static inline struct ecryptfs_dentry_info * 464 ecryptfs_dentry_to_private(struct dentry *dentry) 465 { 466 return (struct ecryptfs_dentry_info *)dentry->d_fsdata; 467 } 468 469 static inline void 470 ecryptfs_set_dentry_private(struct dentry *dentry, 471 struct ecryptfs_dentry_info *dentry_info) 472 { 473 dentry->d_fsdata = dentry_info; 474 } 475 476 static inline struct dentry * 477 ecryptfs_dentry_to_lower(struct dentry *dentry) 478 { 479 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry; 480 } 481 482 static inline void 483 ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry) 484 { 485 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry = 486 lower_dentry; 487 } 488 489 static inline struct vfsmount * 490 ecryptfs_dentry_to_lower_mnt(struct dentry *dentry) 491 { 492 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt; 493 } 494 495 static inline void 496 ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt) 497 { 498 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt = 499 lower_mnt; 500 } 501 502 #define ecryptfs_printk(type, fmt, arg...) \ 503 __ecryptfs_printk(type "%s: " fmt, __FUNCTION__, ## arg); 504 void __ecryptfs_printk(const char *fmt, ...); 505 506 extern const struct file_operations ecryptfs_main_fops; 507 extern const struct file_operations ecryptfs_dir_fops; 508 extern const struct inode_operations ecryptfs_main_iops; 509 extern const struct inode_operations ecryptfs_dir_iops; 510 extern const struct inode_operations ecryptfs_symlink_iops; 511 extern const struct super_operations ecryptfs_sops; 512 extern struct dentry_operations ecryptfs_dops; 513 extern struct address_space_operations ecryptfs_aops; 514 extern int ecryptfs_verbosity; 515 extern unsigned int ecryptfs_message_buf_len; 516 extern signed long ecryptfs_message_wait_timeout; 517 extern unsigned int ecryptfs_number_of_users; 518 519 extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache; 520 extern struct kmem_cache *ecryptfs_file_info_cache; 521 extern struct kmem_cache *ecryptfs_dentry_info_cache; 522 extern struct kmem_cache *ecryptfs_inode_info_cache; 523 extern struct kmem_cache *ecryptfs_sb_info_cache; 524 extern struct kmem_cache *ecryptfs_header_cache_1; 525 extern struct kmem_cache *ecryptfs_header_cache_2; 526 extern struct kmem_cache *ecryptfs_xattr_cache; 527 extern struct kmem_cache *ecryptfs_key_record_cache; 528 extern struct kmem_cache *ecryptfs_key_sig_cache; 529 extern struct kmem_cache *ecryptfs_global_auth_tok_cache; 530 extern struct kmem_cache *ecryptfs_key_tfm_cache; 531 532 int ecryptfs_interpose(struct dentry *hidden_dentry, 533 struct dentry *this_dentry, struct super_block *sb, 534 int flag); 535 int ecryptfs_fill_zeros(struct file *file, loff_t new_length); 536 int ecryptfs_decode_filename(struct ecryptfs_crypt_stat *crypt_stat, 537 const char *name, int length, 538 char **decrypted_name); 539 int ecryptfs_encode_filename(struct ecryptfs_crypt_stat *crypt_stat, 540 const char *name, int length, 541 char **encoded_name); 542 struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry); 543 void ecryptfs_dump_hex(char *data, int bytes); 544 int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg, 545 int sg_size); 546 int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat); 547 void ecryptfs_rotate_iv(unsigned char *iv); 548 void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); 549 void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); 550 void ecryptfs_destroy_mount_crypt_stat( 551 struct ecryptfs_mount_crypt_stat *mount_crypt_stat); 552 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat); 553 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode); 554 int ecryptfs_encrypt_page(struct page *page); 555 int ecryptfs_decrypt_page(struct page *page); 556 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry); 557 int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry); 558 int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry); 559 int ecryptfs_read_and_validate_header_region(char *data, 560 struct inode *ecryptfs_inode); 561 int ecryptfs_read_and_validate_xattr_region(char *page_virt, 562 struct dentry *ecryptfs_dentry); 563 u8 ecryptfs_code_for_cipher_string(struct ecryptfs_crypt_stat *crypt_stat); 564 int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code); 565 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat); 566 int ecryptfs_generate_key_packet_set(char *dest_base, 567 struct ecryptfs_crypt_stat *crypt_stat, 568 struct dentry *ecryptfs_dentry, 569 size_t *len, size_t max); 570 int 571 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat, 572 unsigned char *src, struct dentry *ecryptfs_dentry); 573 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length); 574 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode); 575 int ecryptfs_inode_set(struct inode *inode, void *lower_inode); 576 void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode); 577 ssize_t 578 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 579 void *value, size_t size); 580 int 581 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 582 size_t size, int flags); 583 int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode); 584 int ecryptfs_process_helo(unsigned int transport, uid_t uid, pid_t pid); 585 int ecryptfs_process_quit(uid_t uid, pid_t pid); 586 int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t uid, 587 pid_t pid, u32 seq); 588 int ecryptfs_send_message(unsigned int transport, char *data, int data_len, 589 struct ecryptfs_msg_ctx **msg_ctx); 590 int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx, 591 struct ecryptfs_message **emsg); 592 int ecryptfs_init_messaging(unsigned int transport); 593 void ecryptfs_release_messaging(unsigned int transport); 594 595 int ecryptfs_send_netlink(char *data, int data_len, 596 struct ecryptfs_msg_ctx *msg_ctx, u16 msg_type, 597 u16 msg_flags, pid_t daemon_pid); 598 int ecryptfs_init_netlink(void); 599 void ecryptfs_release_netlink(void); 600 601 int ecryptfs_send_connector(char *data, int data_len, 602 struct ecryptfs_msg_ctx *msg_ctx, u16 msg_type, 603 u16 msg_flags, pid_t daemon_pid); 604 int ecryptfs_init_connector(void); 605 void ecryptfs_release_connector(void); 606 void 607 ecryptfs_write_header_metadata(char *virt, 608 struct ecryptfs_crypt_stat *crypt_stat, 609 size_t *written); 610 int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig); 611 int 612 ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat, 613 char *sig); 614 int ecryptfs_get_global_auth_tok_for_sig( 615 struct ecryptfs_global_auth_tok **global_auth_tok, 616 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig); 617 int 618 ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name, 619 size_t key_size); 620 int ecryptfs_init_crypto(void); 621 int ecryptfs_destroy_crypto(void); 622 int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm); 623 int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm, 624 struct mutex **tfm_mutex, 625 char *cipher_name); 626 int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key, 627 struct ecryptfs_auth_tok **auth_tok, 628 char *sig); 629 int ecryptfs_write_zeros(struct file *file, pgoff_t index, int start, 630 int num_zeros); 631 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data, 632 loff_t offset, size_t size); 633 int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode, 634 struct page *page_for_lower, 635 size_t offset_in_page, size_t size); 636 int ecryptfs_write(struct file *ecryptfs_file, char *data, loff_t offset, 637 size_t size); 638 int ecryptfs_read_lower(char *data, loff_t offset, size_t size, 639 struct inode *ecryptfs_inode); 640 int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs, 641 pgoff_t page_index, 642 size_t offset_in_page, size_t size, 643 struct inode *ecryptfs_inode); 644 struct page *ecryptfs_get_locked_page(struct file *file, loff_t index); 645 646 #endif /* #ifndef ECRYPTFS_KERNEL_H */ 647