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 <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 <crypto/skcipher.h> 32 #include <keys/user-type.h> 33 #include <keys/encrypted-type.h> 34 #include <linux/fs.h> 35 #include <linux/fs_stack.h> 36 #include <linux/namei.h> 37 #include <linux/scatterlist.h> 38 #include <linux/hash.h> 39 #include <linux/nsproxy.h> 40 #include <linux/backing-dev.h> 41 #include <linux/ecryptfs.h> 42 43 #define ECRYPTFS_DEFAULT_IV_BYTES 16 44 #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096 45 #define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192 46 #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32 47 #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ 48 #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3) 49 #define ECRYPTFS_DEFAULT_NUM_USERS 4 50 #define ECRYPTFS_MAX_NUM_USERS 32768 51 #define ECRYPTFS_XATTR_NAME "user.ecryptfs" 52 53 void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok); 54 extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size); 55 extern void ecryptfs_from_hex(char *dst, char *src, int dst_size); 56 57 struct ecryptfs_key_record { 58 unsigned char type; 59 size_t enc_key_size; 60 unsigned char sig[ECRYPTFS_SIG_SIZE]; 61 unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES]; 62 }; 63 64 struct ecryptfs_auth_tok_list { 65 struct ecryptfs_auth_tok *auth_tok; 66 struct list_head list; 67 }; 68 69 struct ecryptfs_crypt_stat; 70 struct ecryptfs_mount_crypt_stat; 71 72 struct ecryptfs_page_crypt_context { 73 struct page *page; 74 #define ECRYPTFS_PREPARE_COMMIT_MODE 0 75 #define ECRYPTFS_WRITEPAGE_MODE 1 76 unsigned int mode; 77 union { 78 struct file *lower_file; 79 struct writeback_control *wbc; 80 } param; 81 }; 82 83 #if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE) 84 static inline struct ecryptfs_auth_tok * 85 ecryptfs_get_encrypted_key_payload_data(struct key *key) 86 { 87 if (key->type == &key_type_encrypted) 88 return (struct ecryptfs_auth_tok *) 89 (&((struct encrypted_key_payload *)key->payload.data[0])->payload_data); 90 else 91 return NULL; 92 } 93 94 static inline struct key *ecryptfs_get_encrypted_key(char *sig) 95 { 96 return request_key(&key_type_encrypted, sig, NULL); 97 } 98 99 #else 100 static inline struct ecryptfs_auth_tok * 101 ecryptfs_get_encrypted_key_payload_data(struct key *key) 102 { 103 return NULL; 104 } 105 106 static inline struct key *ecryptfs_get_encrypted_key(char *sig) 107 { 108 return ERR_PTR(-ENOKEY); 109 } 110 111 #endif /* CONFIG_ENCRYPTED_KEYS */ 112 113 static inline struct ecryptfs_auth_tok * 114 ecryptfs_get_key_payload_data(struct key *key) 115 { 116 struct ecryptfs_auth_tok *auth_tok; 117 118 auth_tok = ecryptfs_get_encrypted_key_payload_data(key); 119 if (!auth_tok) 120 return (struct ecryptfs_auth_tok *)user_key_payload_locked(key)->data; 121 else 122 return auth_tok; 123 } 124 125 #define ECRYPTFS_MAX_KEYSET_SIZE 1024 126 #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 31 127 #define ECRYPTFS_MAX_NUM_ENC_KEYS 64 128 #define ECRYPTFS_MAX_IV_BYTES 16 /* 128 bits */ 129 #define ECRYPTFS_SALT_BYTES 2 130 #define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5 131 #define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8 /* 4*2 */ 132 #define ECRYPTFS_FILE_SIZE_BYTES (sizeof(u64)) 133 #define ECRYPTFS_SIZE_AND_MARKER_BYTES (ECRYPTFS_FILE_SIZE_BYTES \ 134 + MAGIC_ECRYPTFS_MARKER_SIZE_BYTES) 135 #define ECRYPTFS_DEFAULT_CIPHER "aes" 136 #define ECRYPTFS_DEFAULT_KEY_BYTES 16 137 #define ECRYPTFS_DEFAULT_HASH "md5" 138 #define ECRYPTFS_TAG_70_DIGEST ECRYPTFS_DEFAULT_HASH 139 #define ECRYPTFS_TAG_1_PACKET_TYPE 0x01 140 #define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C 141 #define ECRYPTFS_TAG_11_PACKET_TYPE 0xED 142 #define ECRYPTFS_TAG_64_PACKET_TYPE 0x40 143 #define ECRYPTFS_TAG_65_PACKET_TYPE 0x41 144 #define ECRYPTFS_TAG_66_PACKET_TYPE 0x42 145 #define ECRYPTFS_TAG_67_PACKET_TYPE 0x43 146 #define ECRYPTFS_TAG_70_PACKET_TYPE 0x46 /* FNEK-encrypted filename 147 * as dentry name */ 148 #define ECRYPTFS_TAG_71_PACKET_TYPE 0x47 /* FNEK-encrypted filename in 149 * metadata */ 150 #define ECRYPTFS_TAG_72_PACKET_TYPE 0x48 /* FEK-encrypted filename as 151 * dentry name */ 152 #define ECRYPTFS_TAG_73_PACKET_TYPE 0x49 /* FEK-encrypted filename as 153 * metadata */ 154 #define ECRYPTFS_MIN_PKT_LEN_SIZE 1 /* Min size to specify packet length */ 155 #define ECRYPTFS_MAX_PKT_LEN_SIZE 2 /* Pass at least this many bytes to 156 * ecryptfs_parse_packet_length() and 157 * ecryptfs_write_packet_length() 158 */ 159 /* Constraint: ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES >= 160 * ECRYPTFS_MAX_IV_BYTES */ 161 #define ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES 16 162 #define ECRYPTFS_NON_NULL 0x42 /* A reasonable substitute for NULL */ 163 #define MD5_DIGEST_SIZE 16 164 #define ECRYPTFS_TAG_70_DIGEST_SIZE MD5_DIGEST_SIZE 165 #define ECRYPTFS_TAG_70_MIN_METADATA_SIZE (1 + ECRYPTFS_MIN_PKT_LEN_SIZE \ 166 + ECRYPTFS_SIG_SIZE + 1 + 1) 167 #define ECRYPTFS_TAG_70_MAX_METADATA_SIZE (1 + ECRYPTFS_MAX_PKT_LEN_SIZE \ 168 + ECRYPTFS_SIG_SIZE + 1 + 1) 169 #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FEK_ENCRYPTED." 170 #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX_SIZE 23 171 #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FNEK_ENCRYPTED." 172 #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE 24 173 #define ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN (18 + 1 + 4 + 1 + 32) 174 175 #ifdef CONFIG_ECRYPT_FS_MESSAGING 176 # define ECRYPTFS_VERSIONING_MASK_MESSAGING (ECRYPTFS_VERSIONING_DEVMISC \ 177 | ECRYPTFS_VERSIONING_PUBKEY) 178 #else 179 # define ECRYPTFS_VERSIONING_MASK_MESSAGING 0 180 #endif 181 182 #define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \ 183 | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \ 184 | ECRYPTFS_VERSIONING_XATTR \ 185 | ECRYPTFS_VERSIONING_MULTKEY \ 186 | ECRYPTFS_VERSIONING_MASK_MESSAGING \ 187 | ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION) 188 struct ecryptfs_key_sig { 189 struct list_head crypt_stat_list; 190 char keysig[ECRYPTFS_SIG_SIZE_HEX + 1]; 191 }; 192 193 struct ecryptfs_filename { 194 struct list_head crypt_stat_list; 195 #define ECRYPTFS_FILENAME_CONTAINS_DECRYPTED 0x00000001 196 u32 flags; 197 u32 seq_no; 198 char *filename; 199 char *encrypted_filename; 200 size_t filename_size; 201 size_t encrypted_filename_size; 202 char fnek_sig[ECRYPTFS_SIG_SIZE_HEX]; 203 char dentry_name[ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN + 1]; 204 }; 205 206 /** 207 * This is the primary struct associated with each encrypted file. 208 * 209 * TODO: cache align/pack? 210 */ 211 struct ecryptfs_crypt_stat { 212 #define ECRYPTFS_STRUCT_INITIALIZED 0x00000001 213 #define ECRYPTFS_POLICY_APPLIED 0x00000002 214 #define ECRYPTFS_ENCRYPTED 0x00000004 215 #define ECRYPTFS_SECURITY_WARNING 0x00000008 216 #define ECRYPTFS_ENABLE_HMAC 0x00000010 217 #define ECRYPTFS_ENCRYPT_IV_PAGES 0x00000020 218 #define ECRYPTFS_KEY_VALID 0x00000040 219 #define ECRYPTFS_METADATA_IN_XATTR 0x00000080 220 #define ECRYPTFS_VIEW_AS_ENCRYPTED 0x00000100 221 #define ECRYPTFS_KEY_SET 0x00000200 222 #define ECRYPTFS_ENCRYPT_FILENAMES 0x00000400 223 #define ECRYPTFS_ENCFN_USE_MOUNT_FNEK 0x00000800 224 #define ECRYPTFS_ENCFN_USE_FEK 0x00001000 225 #define ECRYPTFS_UNLINK_SIGS 0x00002000 226 #define ECRYPTFS_I_SIZE_INITIALIZED 0x00004000 227 u32 flags; 228 unsigned int file_version; 229 size_t iv_bytes; 230 size_t metadata_size; 231 size_t extent_size; /* Data extent size; default is 4096 */ 232 size_t key_size; 233 size_t extent_shift; 234 unsigned int extent_mask; 235 struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 236 struct crypto_skcipher *tfm; 237 struct crypto_shash *hash_tfm; /* Crypto context for generating 238 * the initialization vectors */ 239 unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; 240 unsigned char key[ECRYPTFS_MAX_KEY_BYTES]; 241 unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES]; 242 struct list_head keysig_list; 243 struct mutex keysig_list_mutex; 244 struct mutex cs_tfm_mutex; 245 struct mutex cs_mutex; 246 }; 247 248 /* inode private data. */ 249 struct ecryptfs_inode_info { 250 struct inode vfs_inode; 251 struct inode *wii_inode; 252 struct mutex lower_file_mutex; 253 atomic_t lower_file_count; 254 struct file *lower_file; 255 struct ecryptfs_crypt_stat crypt_stat; 256 }; 257 258 /* dentry private data. Each dentry must keep track of a lower 259 * vfsmount too. */ 260 struct ecryptfs_dentry_info { 261 struct path lower_path; 262 union { 263 struct ecryptfs_crypt_stat *crypt_stat; 264 struct rcu_head rcu; 265 }; 266 }; 267 268 /** 269 * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint 270 * @flags: Status flags 271 * @mount_crypt_stat_list: These auth_toks hang off the mount-wide 272 * cryptographic context. Every time a new 273 * inode comes into existence, eCryptfs copies 274 * the auth_toks on that list to the set of 275 * auth_toks on the inode's crypt_stat 276 * @global_auth_tok_key: The key from the user's keyring for the sig 277 * @global_auth_tok: The key contents 278 * @sig: The key identifier 279 * 280 * ecryptfs_global_auth_tok structs refer to authentication token keys 281 * in the user keyring that apply to newly created files. A list of 282 * these objects hangs off of the mount_crypt_stat struct for any 283 * given eCryptfs mount. This struct maintains a reference to both the 284 * key contents and the key itself so that the key can be put on 285 * unmount. 286 */ 287 struct ecryptfs_global_auth_tok { 288 #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001 289 #define ECRYPTFS_AUTH_TOK_FNEK 0x00000002 290 u32 flags; 291 struct list_head mount_crypt_stat_list; 292 struct key *global_auth_tok_key; 293 unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1]; 294 }; 295 296 /** 297 * ecryptfs_key_tfm - Persistent key tfm 298 * @key_tfm: crypto API handle to the key 299 * @key_size: Key size in bytes 300 * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is 301 * using the persistent TFM at any point in time 302 * @key_tfm_list: Handle to hang this off the module-wide TFM list 303 * @cipher_name: String name for the cipher for this TFM 304 * 305 * Typically, eCryptfs will use the same ciphers repeatedly throughout 306 * the course of its operations. In order to avoid unnecessarily 307 * destroying and initializing the same cipher repeatedly, eCryptfs 308 * keeps a list of crypto API contexts around to use when needed. 309 */ 310 struct ecryptfs_key_tfm { 311 struct crypto_skcipher *key_tfm; 312 size_t key_size; 313 struct mutex key_tfm_mutex; 314 struct list_head key_tfm_list; 315 unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; 316 }; 317 318 extern struct mutex key_tfm_list_mutex; 319 320 /** 321 * This struct is to enable a mount-wide passphrase/salt combo. This 322 * is more or less a stopgap to provide similar functionality to other 323 * crypto filesystems like EncFS or CFS until full policy support is 324 * implemented in eCryptfs. 325 */ 326 struct ecryptfs_mount_crypt_stat { 327 /* Pointers to memory we do not own, do not free these */ 328 #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001 329 #define ECRYPTFS_XATTR_METADATA_ENABLED 0x00000002 330 #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED 0x00000004 331 #define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED 0x00000008 332 #define ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES 0x00000010 333 #define ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK 0x00000020 334 #define ECRYPTFS_GLOBAL_ENCFN_USE_FEK 0x00000040 335 #define ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY 0x00000080 336 u32 flags; 337 struct list_head global_auth_tok_list; 338 struct mutex global_auth_tok_list_mutex; 339 size_t global_default_cipher_key_size; 340 size_t global_default_fn_cipher_key_bytes; 341 unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE 342 + 1]; 343 unsigned char global_default_fn_cipher_name[ 344 ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; 345 char global_default_fnek_sig[ECRYPTFS_SIG_SIZE_HEX + 1]; 346 }; 347 348 /* superblock private data. */ 349 struct ecryptfs_sb_info { 350 struct super_block *wsi_sb; 351 struct ecryptfs_mount_crypt_stat mount_crypt_stat; 352 struct backing_dev_info bdi; 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 /* Can never be greater than ecryptfs_message_buf_len */ 370 /* Used to find the parent msg_ctx */ 371 /* Inherits from msg_ctx->index */ 372 u32 index; 373 u32 data_len; 374 u8 data[]; 375 }; 376 377 struct ecryptfs_msg_ctx { 378 #define ECRYPTFS_MSG_CTX_STATE_FREE 0x01 379 #define ECRYPTFS_MSG_CTX_STATE_PENDING 0x02 380 #define ECRYPTFS_MSG_CTX_STATE_DONE 0x03 381 #define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04 382 u8 state; 383 #define ECRYPTFS_MSG_HELO 100 384 #define ECRYPTFS_MSG_QUIT 101 385 #define ECRYPTFS_MSG_REQUEST 102 386 #define ECRYPTFS_MSG_RESPONSE 103 387 u8 type; 388 u32 index; 389 /* Counter converts to a sequence number. Each message sent 390 * out for which we expect a response has an associated 391 * sequence number. The response must have the same sequence 392 * number as the counter for the msg_stc for the message to be 393 * valid. */ 394 u32 counter; 395 size_t msg_size; 396 struct ecryptfs_message *msg; 397 struct task_struct *task; 398 struct list_head node; 399 struct list_head daemon_out_list; 400 struct mutex mux; 401 }; 402 403 struct ecryptfs_daemon { 404 #define ECRYPTFS_DAEMON_IN_READ 0x00000001 405 #define ECRYPTFS_DAEMON_IN_POLL 0x00000002 406 #define ECRYPTFS_DAEMON_ZOMBIE 0x00000004 407 #define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008 408 u32 flags; 409 u32 num_queued_msg_ctx; 410 struct file *file; 411 struct mutex mux; 412 struct list_head msg_ctx_out_queue; 413 wait_queue_head_t wait; 414 struct hlist_node euid_chain; 415 }; 416 417 #ifdef CONFIG_ECRYPT_FS_MESSAGING 418 extern struct mutex ecryptfs_daemon_hash_mux; 419 #endif 420 421 static inline size_t 422 ecryptfs_lower_header_size(struct ecryptfs_crypt_stat *crypt_stat) 423 { 424 if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) 425 return 0; 426 return crypt_stat->metadata_size; 427 } 428 429 static inline struct ecryptfs_file_info * 430 ecryptfs_file_to_private(struct file *file) 431 { 432 return file->private_data; 433 } 434 435 static inline void 436 ecryptfs_set_file_private(struct file *file, 437 struct ecryptfs_file_info *file_info) 438 { 439 file->private_data = file_info; 440 } 441 442 static inline struct file *ecryptfs_file_to_lower(struct file *file) 443 { 444 return ((struct ecryptfs_file_info *)file->private_data)->wfi_file; 445 } 446 447 static inline void 448 ecryptfs_set_file_lower(struct file *file, struct file *lower_file) 449 { 450 ((struct ecryptfs_file_info *)file->private_data)->wfi_file = 451 lower_file; 452 } 453 454 static inline struct ecryptfs_inode_info * 455 ecryptfs_inode_to_private(struct inode *inode) 456 { 457 return container_of(inode, struct ecryptfs_inode_info, vfs_inode); 458 } 459 460 static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode) 461 { 462 return ecryptfs_inode_to_private(inode)->wii_inode; 463 } 464 465 static inline void 466 ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode) 467 { 468 ecryptfs_inode_to_private(inode)->wii_inode = lower_inode; 469 } 470 471 static inline struct ecryptfs_sb_info * 472 ecryptfs_superblock_to_private(struct super_block *sb) 473 { 474 return (struct ecryptfs_sb_info *)sb->s_fs_info; 475 } 476 477 static inline void 478 ecryptfs_set_superblock_private(struct super_block *sb, 479 struct ecryptfs_sb_info *sb_info) 480 { 481 sb->s_fs_info = sb_info; 482 } 483 484 static inline struct super_block * 485 ecryptfs_superblock_to_lower(struct super_block *sb) 486 { 487 return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb; 488 } 489 490 static inline void 491 ecryptfs_set_superblock_lower(struct super_block *sb, 492 struct super_block *lower_sb) 493 { 494 ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb; 495 } 496 497 static inline struct ecryptfs_dentry_info * 498 ecryptfs_dentry_to_private(struct dentry *dentry) 499 { 500 return (struct ecryptfs_dentry_info *)dentry->d_fsdata; 501 } 502 503 static inline void 504 ecryptfs_set_dentry_private(struct dentry *dentry, 505 struct ecryptfs_dentry_info *dentry_info) 506 { 507 dentry->d_fsdata = dentry_info; 508 } 509 510 static inline struct dentry * 511 ecryptfs_dentry_to_lower(struct dentry *dentry) 512 { 513 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry; 514 } 515 516 static inline struct vfsmount * 517 ecryptfs_dentry_to_lower_mnt(struct dentry *dentry) 518 { 519 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt; 520 } 521 522 static inline struct path * 523 ecryptfs_dentry_to_lower_path(struct dentry *dentry) 524 { 525 return &((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path; 526 } 527 528 #define ecryptfs_printk(type, fmt, arg...) \ 529 __ecryptfs_printk(type "%s: " fmt, __func__, ## arg); 530 __printf(1, 2) 531 void __ecryptfs_printk(const char *fmt, ...); 532 533 extern const struct file_operations ecryptfs_main_fops; 534 extern const struct file_operations ecryptfs_dir_fops; 535 extern const struct inode_operations ecryptfs_main_iops; 536 extern const struct inode_operations ecryptfs_dir_iops; 537 extern const struct inode_operations ecryptfs_symlink_iops; 538 extern const struct super_operations ecryptfs_sops; 539 extern const struct dentry_operations ecryptfs_dops; 540 extern const struct address_space_operations ecryptfs_aops; 541 extern int ecryptfs_verbosity; 542 extern unsigned int ecryptfs_message_buf_len; 543 extern signed long ecryptfs_message_wait_timeout; 544 extern unsigned int ecryptfs_number_of_users; 545 546 extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache; 547 extern struct kmem_cache *ecryptfs_file_info_cache; 548 extern struct kmem_cache *ecryptfs_dentry_info_cache; 549 extern struct kmem_cache *ecryptfs_inode_info_cache; 550 extern struct kmem_cache *ecryptfs_sb_info_cache; 551 extern struct kmem_cache *ecryptfs_header_cache; 552 extern struct kmem_cache *ecryptfs_xattr_cache; 553 extern struct kmem_cache *ecryptfs_key_record_cache; 554 extern struct kmem_cache *ecryptfs_key_sig_cache; 555 extern struct kmem_cache *ecryptfs_global_auth_tok_cache; 556 extern struct kmem_cache *ecryptfs_key_tfm_cache; 557 558 struct inode *ecryptfs_get_inode(struct inode *lower_inode, 559 struct super_block *sb); 560 void ecryptfs_i_size_init(const char *page_virt, struct inode *inode); 561 int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, 562 struct inode *ecryptfs_inode); 563 int ecryptfs_decode_and_decrypt_filename(char **decrypted_name, 564 size_t *decrypted_name_size, 565 struct super_block *sb, 566 const char *name, size_t name_size); 567 int ecryptfs_fill_zeros(struct file *file, loff_t new_length); 568 int ecryptfs_encrypt_and_encode_filename( 569 char **encoded_name, 570 size_t *encoded_name_size, 571 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, 572 const char *name, size_t name_size); 573 struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry); 574 void ecryptfs_dump_hex(char *data, int bytes); 575 int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg, 576 int sg_size); 577 int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat); 578 void ecryptfs_rotate_iv(unsigned char *iv); 579 int ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); 580 void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); 581 void ecryptfs_destroy_mount_crypt_stat( 582 struct ecryptfs_mount_crypt_stat *mount_crypt_stat); 583 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat); 584 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode); 585 int ecryptfs_encrypt_page(struct page *page); 586 int ecryptfs_decrypt_page(struct page *page); 587 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry, 588 struct inode *ecryptfs_inode); 589 int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry); 590 int ecryptfs_new_file_context(struct inode *ecryptfs_inode); 591 void ecryptfs_write_crypt_stat_flags(char *page_virt, 592 struct ecryptfs_crypt_stat *crypt_stat, 593 size_t *written); 594 int ecryptfs_read_and_validate_header_region(struct inode *inode); 595 int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry, 596 struct inode *inode); 597 u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes); 598 int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code); 599 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat); 600 int ecryptfs_generate_key_packet_set(char *dest_base, 601 struct ecryptfs_crypt_stat *crypt_stat, 602 struct dentry *ecryptfs_dentry, 603 size_t *len, size_t max); 604 int 605 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat, 606 unsigned char *src, struct dentry *ecryptfs_dentry); 607 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length); 608 ssize_t 609 ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode, 610 const char *name, void *value, size_t size); 611 int 612 ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, const char *name, 613 const void *value, size_t size, int flags); 614 int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode); 615 #ifdef CONFIG_ECRYPT_FS_MESSAGING 616 int ecryptfs_process_response(struct ecryptfs_daemon *daemon, 617 struct ecryptfs_message *msg, u32 seq); 618 int ecryptfs_send_message(char *data, int data_len, 619 struct ecryptfs_msg_ctx **msg_ctx); 620 int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx, 621 struct ecryptfs_message **emsg); 622 int ecryptfs_init_messaging(void); 623 void ecryptfs_release_messaging(void); 624 #else 625 static inline int ecryptfs_init_messaging(void) 626 { 627 return 0; 628 } 629 static inline void ecryptfs_release_messaging(void) 630 { } 631 static inline int ecryptfs_send_message(char *data, int data_len, 632 struct ecryptfs_msg_ctx **msg_ctx) 633 { 634 return -ENOTCONN; 635 } 636 static inline int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx, 637 struct ecryptfs_message **emsg) 638 { 639 return -ENOMSG; 640 } 641 #endif 642 643 void 644 ecryptfs_write_header_metadata(char *virt, 645 struct ecryptfs_crypt_stat *crypt_stat, 646 size_t *written); 647 int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig); 648 int 649 ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat, 650 char *sig, u32 global_auth_tok_flags); 651 int ecryptfs_get_global_auth_tok_for_sig( 652 struct ecryptfs_global_auth_tok **global_auth_tok, 653 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig); 654 int 655 ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name, 656 size_t key_size); 657 int ecryptfs_init_crypto(void); 658 int ecryptfs_destroy_crypto(void); 659 int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm); 660 int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_skcipher **tfm, 661 struct mutex **tfm_mutex, 662 char *cipher_name); 663 int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key, 664 struct ecryptfs_auth_tok **auth_tok, 665 char *sig); 666 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data, 667 loff_t offset, size_t size); 668 int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode, 669 struct page *page_for_lower, 670 size_t offset_in_page, size_t size); 671 int ecryptfs_write(struct inode *inode, char *data, loff_t offset, size_t size); 672 int ecryptfs_read_lower(char *data, loff_t offset, size_t size, 673 struct inode *ecryptfs_inode); 674 int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs, 675 pgoff_t page_index, 676 size_t offset_in_page, size_t size, 677 struct inode *ecryptfs_inode); 678 struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index); 679 int ecryptfs_parse_packet_length(unsigned char *data, size_t *size, 680 size_t *length_size); 681 int ecryptfs_write_packet_length(char *dest, size_t size, 682 size_t *packet_size_length); 683 #ifdef CONFIG_ECRYPT_FS_MESSAGING 684 int ecryptfs_init_ecryptfs_miscdev(void); 685 void ecryptfs_destroy_ecryptfs_miscdev(void); 686 int ecryptfs_send_miscdev(char *data, size_t data_size, 687 struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type, 688 u16 msg_flags, struct ecryptfs_daemon *daemon); 689 void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx); 690 int 691 ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, struct file *file); 692 int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon); 693 int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon); 694 #endif 695 int ecryptfs_init_kthread(void); 696 void ecryptfs_destroy_kthread(void); 697 int ecryptfs_privileged_open(struct file **lower_file, 698 struct dentry *lower_dentry, 699 struct vfsmount *lower_mnt, 700 const struct cred *cred); 701 int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode); 702 void ecryptfs_put_lower_file(struct inode *inode); 703 int 704 ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes, 705 size_t *packet_size, 706 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, 707 char *filename, size_t filename_size); 708 int 709 ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size, 710 size_t *packet_size, 711 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, 712 char *data, size_t max_packet_size); 713 int ecryptfs_set_f_namelen(long *namelen, long lower_namelen, 714 struct ecryptfs_mount_crypt_stat *mount_crypt_stat); 715 int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat, 716 loff_t offset); 717 718 extern const struct xattr_handler *ecryptfs_xattr_handlers[]; 719 720 #endif /* #ifndef ECRYPTFS_KERNEL_H */ 721