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 <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 39 /* Version verification for shared data structures w/ userspace */ 40 #define ECRYPTFS_VERSION_MAJOR 0x00 41 #define ECRYPTFS_VERSION_MINOR 0x04 42 #define ECRYPTFS_SUPPORTED_FILE_VERSION 0x03 43 /* These flags indicate which features are supported by the kernel 44 * module; userspace tools such as the mount helper read 45 * ECRYPTFS_VERSIONING_MASK from a sysfs handle in order to determine 46 * how to behave. */ 47 #define ECRYPTFS_VERSIONING_PASSPHRASE 0x00000001 48 #define ECRYPTFS_VERSIONING_PUBKEY 0x00000002 49 #define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004 50 #define ECRYPTFS_VERSIONING_POLICY 0x00000008 51 #define ECRYPTFS_VERSIONING_XATTR 0x00000010 52 #define ECRYPTFS_VERSIONING_MULTKEY 0x00000020 53 #define ECRYPTFS_VERSIONING_DEVMISC 0x00000040 54 #define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \ 55 | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \ 56 | ECRYPTFS_VERSIONING_PUBKEY \ 57 | ECRYPTFS_VERSIONING_XATTR \ 58 | ECRYPTFS_VERSIONING_MULTKEY \ 59 | ECRYPTFS_VERSIONING_DEVMISC) 60 #define ECRYPTFS_MAX_PASSWORD_LENGTH 64 61 #define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH 62 #define ECRYPTFS_SALT_SIZE 8 63 #define ECRYPTFS_SALT_SIZE_HEX (ECRYPTFS_SALT_SIZE*2) 64 /* The original signature size is only for what is stored on disk; all 65 * in-memory representations are expanded hex, so it better adapted to 66 * be passed around or referenced on the command line */ 67 #define ECRYPTFS_SIG_SIZE 8 68 #define ECRYPTFS_SIG_SIZE_HEX (ECRYPTFS_SIG_SIZE*2) 69 #define ECRYPTFS_PASSWORD_SIG_SIZE ECRYPTFS_SIG_SIZE_HEX 70 #define ECRYPTFS_MAX_KEY_BYTES 64 71 #define ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 512 72 #define ECRYPTFS_DEFAULT_IV_BYTES 16 73 #define ECRYPTFS_FILE_VERSION 0x03 74 #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096 75 #define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192 76 #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32 77 #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ 78 #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3) 79 #define ECRYPTFS_MAX_PKI_NAME_BYTES 16 80 #define ECRYPTFS_DEFAULT_NUM_USERS 4 81 #define ECRYPTFS_MAX_NUM_USERS 32768 82 #define ECRYPTFS_TRANSPORT_NETLINK 0 83 #define ECRYPTFS_TRANSPORT_CONNECTOR 1 84 #define ECRYPTFS_TRANSPORT_RELAYFS 2 85 #define ECRYPTFS_TRANSPORT_MISCDEV 3 86 #define ECRYPTFS_DEFAULT_TRANSPORT ECRYPTFS_TRANSPORT_MISCDEV 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 #define ECRYPTFS_DELAY_PERSISTENT 0x00000800 239 u32 flags; 240 unsigned int file_version; 241 size_t iv_bytes; 242 size_t num_header_bytes_at_front; 243 size_t extent_size; /* Data extent size; default is 4096 */ 244 size_t key_size; 245 size_t extent_shift; 246 unsigned int extent_mask; 247 struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 248 struct crypto_blkcipher *tfm; 249 struct crypto_hash *hash_tfm; /* Crypto context for generating 250 * the initialization vectors */ 251 unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE]; 252 unsigned char key[ECRYPTFS_MAX_KEY_BYTES]; 253 unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES]; 254 struct list_head keysig_list; 255 struct mutex keysig_list_mutex; 256 struct mutex cs_tfm_mutex; 257 struct mutex cs_hash_tfm_mutex; 258 struct mutex cs_mutex; 259 }; 260 261 /* inode private data. */ 262 struct ecryptfs_inode_info { 263 struct inode vfs_inode; 264 struct inode *wii_inode; 265 struct file *lower_file; 266 struct mutex lower_file_mutex; 267 struct ecryptfs_crypt_stat crypt_stat; 268 }; 269 270 /* dentry private data. Each dentry must keep track of a lower 271 * vfsmount too. */ 272 struct ecryptfs_dentry_info { 273 struct path lower_path; 274 struct ecryptfs_crypt_stat *crypt_stat; 275 }; 276 277 /** 278 * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint 279 * @flags: Status flags 280 * @mount_crypt_stat_list: These auth_toks hang off the mount-wide 281 * cryptographic context. Every time a new 282 * inode comes into existence, eCryptfs copies 283 * the auth_toks on that list to the set of 284 * auth_toks on the inode's crypt_stat 285 * @global_auth_tok_key: The key from the user's keyring for the sig 286 * @global_auth_tok: The key contents 287 * @sig: The key identifier 288 * 289 * ecryptfs_global_auth_tok structs refer to authentication token keys 290 * in the user keyring that apply to newly created files. A list of 291 * these objects hangs off of the mount_crypt_stat struct for any 292 * given eCryptfs mount. This struct maintains a reference to both the 293 * key contents and the key itself so that the key can be put on 294 * unmount. 295 */ 296 struct ecryptfs_global_auth_tok { 297 #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001 298 u32 flags; 299 struct list_head mount_crypt_stat_list; 300 struct key *global_auth_tok_key; 301 struct ecryptfs_auth_tok *global_auth_tok; 302 unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1]; 303 }; 304 305 /** 306 * ecryptfs_key_tfm - Persistent key tfm 307 * @key_tfm: crypto API handle to the key 308 * @key_size: Key size in bytes 309 * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is 310 * using the persistent TFM at any point in time 311 * @key_tfm_list: Handle to hang this off the module-wide TFM list 312 * @cipher_name: String name for the cipher for this TFM 313 * 314 * Typically, eCryptfs will use the same ciphers repeatedly throughout 315 * the course of its operations. In order to avoid unnecessarily 316 * destroying and initializing the same cipher repeatedly, eCryptfs 317 * keeps a list of crypto API contexts around to use when needed. 318 */ 319 struct ecryptfs_key_tfm { 320 struct crypto_blkcipher *key_tfm; 321 size_t key_size; 322 struct mutex key_tfm_mutex; 323 struct list_head key_tfm_list; 324 unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; 325 }; 326 327 extern struct mutex key_tfm_list_mutex; 328 329 /** 330 * This struct is to enable a mount-wide passphrase/salt combo. This 331 * is more or less a stopgap to provide similar functionality to other 332 * crypto filesystems like EncFS or CFS until full policy support is 333 * implemented in eCryptfs. 334 */ 335 struct ecryptfs_mount_crypt_stat { 336 /* Pointers to memory we do not own, do not free these */ 337 #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001 338 #define ECRYPTFS_XATTR_METADATA_ENABLED 0x00000002 339 #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED 0x00000004 340 #define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED 0x00000008 341 u32 flags; 342 struct list_head global_auth_tok_list; 343 struct mutex global_auth_tok_list_mutex; 344 size_t num_global_auth_toks; 345 size_t global_default_cipher_key_size; 346 unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE 347 + 1]; 348 }; 349 350 /* superblock private data. */ 351 struct ecryptfs_sb_info { 352 struct super_block *wsi_sb; 353 struct ecryptfs_mount_crypt_stat mount_crypt_stat; 354 }; 355 356 /* file private data. */ 357 struct ecryptfs_file_info { 358 struct file *wfi_file; 359 struct ecryptfs_crypt_stat *crypt_stat; 360 }; 361 362 /* auth_tok <=> encrypted_session_key mappings */ 363 struct ecryptfs_auth_tok_list_item { 364 unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES]; 365 struct list_head list; 366 struct ecryptfs_auth_tok auth_tok; 367 }; 368 369 struct ecryptfs_message { 370 /* Can never be greater than ecryptfs_message_buf_len */ 371 /* Used to find the parent msg_ctx */ 372 /* Inherits from msg_ctx->index */ 373 u32 index; 374 u32 data_len; 375 u8 data[]; 376 }; 377 378 struct ecryptfs_msg_ctx { 379 #define ECRYPTFS_MSG_CTX_STATE_FREE 0x01 380 #define ECRYPTFS_MSG_CTX_STATE_PENDING 0x02 381 #define ECRYPTFS_MSG_CTX_STATE_DONE 0x03 382 #define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04 383 u8 state; 384 #define ECRYPTFS_MSG_HELO 100 385 #define ECRYPTFS_MSG_QUIT 101 386 #define ECRYPTFS_MSG_REQUEST 102 387 #define ECRYPTFS_MSG_RESPONSE 103 388 u8 type; 389 u32 index; 390 /* Counter converts to a sequence number. Each message sent 391 * out for which we expect a response has an associated 392 * sequence number. The response must have the same sequence 393 * number as the counter for the msg_stc for the message to be 394 * valid. */ 395 u32 counter; 396 size_t msg_size; 397 struct ecryptfs_message *msg; 398 struct task_struct *task; 399 struct list_head node; 400 struct list_head daemon_out_list; 401 struct mutex mux; 402 }; 403 404 extern unsigned int ecryptfs_transport; 405 406 struct ecryptfs_daemon; 407 408 struct ecryptfs_daemon { 409 #define ECRYPTFS_DAEMON_IN_READ 0x00000001 410 #define ECRYPTFS_DAEMON_IN_POLL 0x00000002 411 #define ECRYPTFS_DAEMON_ZOMBIE 0x00000004 412 #define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008 413 u32 flags; 414 u32 num_queued_msg_ctx; 415 struct pid *pid; 416 uid_t euid; 417 struct user_namespace *user_ns; 418 struct task_struct *task; 419 struct mutex mux; 420 struct list_head msg_ctx_out_queue; 421 wait_queue_head_t wait; 422 struct hlist_node euid_chain; 423 }; 424 425 extern struct mutex ecryptfs_daemon_hash_mux; 426 427 static inline struct ecryptfs_file_info * 428 ecryptfs_file_to_private(struct file *file) 429 { 430 return (struct ecryptfs_file_info *)file->private_data; 431 } 432 433 static inline void 434 ecryptfs_set_file_private(struct file *file, 435 struct ecryptfs_file_info *file_info) 436 { 437 file->private_data = file_info; 438 } 439 440 static inline struct file *ecryptfs_file_to_lower(struct file *file) 441 { 442 return ((struct ecryptfs_file_info *)file->private_data)->wfi_file; 443 } 444 445 static inline void 446 ecryptfs_set_file_lower(struct file *file, struct file *lower_file) 447 { 448 ((struct ecryptfs_file_info *)file->private_data)->wfi_file = 449 lower_file; 450 } 451 452 static inline struct ecryptfs_inode_info * 453 ecryptfs_inode_to_private(struct inode *inode) 454 { 455 return container_of(inode, struct ecryptfs_inode_info, vfs_inode); 456 } 457 458 static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode) 459 { 460 return ecryptfs_inode_to_private(inode)->wii_inode; 461 } 462 463 static inline void 464 ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode) 465 { 466 ecryptfs_inode_to_private(inode)->wii_inode = lower_inode; 467 } 468 469 static inline struct ecryptfs_sb_info * 470 ecryptfs_superblock_to_private(struct super_block *sb) 471 { 472 return (struct ecryptfs_sb_info *)sb->s_fs_info; 473 } 474 475 static inline void 476 ecryptfs_set_superblock_private(struct super_block *sb, 477 struct ecryptfs_sb_info *sb_info) 478 { 479 sb->s_fs_info = sb_info; 480 } 481 482 static inline struct super_block * 483 ecryptfs_superblock_to_lower(struct super_block *sb) 484 { 485 return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb; 486 } 487 488 static inline void 489 ecryptfs_set_superblock_lower(struct super_block *sb, 490 struct super_block *lower_sb) 491 { 492 ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb; 493 } 494 495 static inline struct ecryptfs_dentry_info * 496 ecryptfs_dentry_to_private(struct dentry *dentry) 497 { 498 return (struct ecryptfs_dentry_info *)dentry->d_fsdata; 499 } 500 501 static inline void 502 ecryptfs_set_dentry_private(struct dentry *dentry, 503 struct ecryptfs_dentry_info *dentry_info) 504 { 505 dentry->d_fsdata = dentry_info; 506 } 507 508 static inline struct dentry * 509 ecryptfs_dentry_to_lower(struct dentry *dentry) 510 { 511 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry; 512 } 513 514 static inline void 515 ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry) 516 { 517 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry = 518 lower_dentry; 519 } 520 521 static inline struct vfsmount * 522 ecryptfs_dentry_to_lower_mnt(struct dentry *dentry) 523 { 524 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt; 525 } 526 527 static inline void 528 ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt) 529 { 530 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt = 531 lower_mnt; 532 } 533 534 #define ecryptfs_printk(type, fmt, arg...) \ 535 __ecryptfs_printk(type "%s: " fmt, __func__, ## arg); 536 void __ecryptfs_printk(const char *fmt, ...); 537 538 extern const struct file_operations ecryptfs_main_fops; 539 extern const struct file_operations ecryptfs_dir_fops; 540 extern const struct inode_operations ecryptfs_main_iops; 541 extern const struct inode_operations ecryptfs_dir_iops; 542 extern const struct inode_operations ecryptfs_symlink_iops; 543 extern const struct super_operations ecryptfs_sops; 544 extern struct dentry_operations ecryptfs_dops; 545 extern struct address_space_operations ecryptfs_aops; 546 extern int ecryptfs_verbosity; 547 extern unsigned int ecryptfs_message_buf_len; 548 extern signed long ecryptfs_message_wait_timeout; 549 extern unsigned int ecryptfs_number_of_users; 550 551 extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache; 552 extern struct kmem_cache *ecryptfs_file_info_cache; 553 extern struct kmem_cache *ecryptfs_dentry_info_cache; 554 extern struct kmem_cache *ecryptfs_inode_info_cache; 555 extern struct kmem_cache *ecryptfs_sb_info_cache; 556 extern struct kmem_cache *ecryptfs_header_cache_1; 557 extern struct kmem_cache *ecryptfs_header_cache_2; 558 extern struct kmem_cache *ecryptfs_xattr_cache; 559 extern struct kmem_cache *ecryptfs_key_record_cache; 560 extern struct kmem_cache *ecryptfs_key_sig_cache; 561 extern struct kmem_cache *ecryptfs_global_auth_tok_cache; 562 extern struct kmem_cache *ecryptfs_key_tfm_cache; 563 extern struct kmem_cache *ecryptfs_open_req_cache; 564 565 struct ecryptfs_open_req { 566 #define ECRYPTFS_REQ_PROCESSED 0x00000001 567 #define ECRYPTFS_REQ_DROPPED 0x00000002 568 #define ECRYPTFS_REQ_ZOMBIE 0x00000004 569 u32 flags; 570 struct file **lower_file; 571 struct dentry *lower_dentry; 572 struct vfsmount *lower_mnt; 573 wait_queue_head_t wait; 574 struct mutex mux; 575 struct list_head kthread_ctl_list; 576 }; 577 578 #define ECRYPTFS_INTERPOSE_FLAG_D_ADD 0x00000001 579 #define ECRYPTFS_INTERPOSE_FLAG_DELAY_PERSISTENT_FILE 0x00000002 580 int ecryptfs_interpose(struct dentry *hidden_dentry, 581 struct dentry *this_dentry, struct super_block *sb, 582 u32 flags); 583 int ecryptfs_fill_zeros(struct file *file, loff_t new_length); 584 int ecryptfs_decode_filename(struct ecryptfs_crypt_stat *crypt_stat, 585 const char *name, int length, 586 char **decrypted_name); 587 int ecryptfs_encode_filename(struct ecryptfs_crypt_stat *crypt_stat, 588 const char *name, int length, 589 char **encoded_name); 590 struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry); 591 void ecryptfs_dump_hex(char *data, int bytes); 592 int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg, 593 int sg_size); 594 int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat); 595 void ecryptfs_rotate_iv(unsigned char *iv); 596 void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); 597 void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); 598 void ecryptfs_destroy_mount_crypt_stat( 599 struct ecryptfs_mount_crypt_stat *mount_crypt_stat); 600 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat); 601 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode); 602 int ecryptfs_encrypt_page(struct page *page); 603 int ecryptfs_decrypt_page(struct page *page); 604 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry); 605 int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry); 606 int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry); 607 int ecryptfs_read_and_validate_header_region(char *data, 608 struct inode *ecryptfs_inode); 609 int ecryptfs_read_and_validate_xattr_region(char *page_virt, 610 struct dentry *ecryptfs_dentry); 611 u8 ecryptfs_code_for_cipher_string(struct ecryptfs_crypt_stat *crypt_stat); 612 int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code); 613 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat); 614 int ecryptfs_generate_key_packet_set(char *dest_base, 615 struct ecryptfs_crypt_stat *crypt_stat, 616 struct dentry *ecryptfs_dentry, 617 size_t *len, size_t max); 618 int 619 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat, 620 unsigned char *src, struct dentry *ecryptfs_dentry); 621 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length); 622 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode); 623 int ecryptfs_inode_set(struct inode *inode, void *lower_inode); 624 void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode); 625 ssize_t 626 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 627 void *value, size_t size); 628 int 629 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 630 size_t size, int flags); 631 int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode); 632 int ecryptfs_process_helo(unsigned int transport, uid_t euid, 633 struct user_namespace *user_ns, struct pid *pid); 634 int ecryptfs_process_quit(uid_t euid, struct user_namespace *user_ns, 635 struct pid *pid); 636 int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid, 637 struct user_namespace *user_ns, struct pid *pid, 638 u32 seq); 639 int ecryptfs_send_message(unsigned int transport, char *data, int data_len, 640 struct ecryptfs_msg_ctx **msg_ctx); 641 int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx, 642 struct ecryptfs_message **emsg); 643 int ecryptfs_init_messaging(unsigned int transport); 644 void ecryptfs_release_messaging(unsigned int transport); 645 646 int ecryptfs_send_netlink(char *data, int data_len, 647 struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type, 648 u16 msg_flags, struct pid *daemon_pid); 649 int ecryptfs_init_netlink(void); 650 void ecryptfs_release_netlink(void); 651 652 int ecryptfs_send_connector(char *data, int data_len, 653 struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type, 654 u16 msg_flags, struct pid *daemon_pid); 655 int ecryptfs_init_connector(void); 656 void ecryptfs_release_connector(void); 657 void 658 ecryptfs_write_header_metadata(char *virt, 659 struct ecryptfs_crypt_stat *crypt_stat, 660 size_t *written); 661 int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig); 662 int 663 ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat, 664 char *sig); 665 int ecryptfs_get_global_auth_tok_for_sig( 666 struct ecryptfs_global_auth_tok **global_auth_tok, 667 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig); 668 int 669 ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name, 670 size_t key_size); 671 int ecryptfs_init_crypto(void); 672 int ecryptfs_destroy_crypto(void); 673 int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm); 674 int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm, 675 struct mutex **tfm_mutex, 676 char *cipher_name); 677 int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key, 678 struct ecryptfs_auth_tok **auth_tok, 679 char *sig); 680 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data, 681 loff_t offset, size_t size); 682 int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode, 683 struct page *page_for_lower, 684 size_t offset_in_page, size_t size); 685 int ecryptfs_write(struct file *ecryptfs_file, char *data, loff_t offset, 686 size_t size); 687 int ecryptfs_read_lower(char *data, loff_t offset, size_t size, 688 struct inode *ecryptfs_inode); 689 int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs, 690 pgoff_t page_index, 691 size_t offset_in_page, size_t size, 692 struct inode *ecryptfs_inode); 693 struct page *ecryptfs_get_locked_page(struct file *file, loff_t index); 694 int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon); 695 int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon, uid_t euid, 696 struct user_namespace *user_ns); 697 int ecryptfs_parse_packet_length(unsigned char *data, size_t *size, 698 size_t *length_size); 699 int ecryptfs_write_packet_length(char *dest, size_t size, 700 size_t *packet_size_length); 701 int ecryptfs_init_ecryptfs_miscdev(void); 702 void ecryptfs_destroy_ecryptfs_miscdev(void); 703 int ecryptfs_send_miscdev(char *data, size_t data_size, 704 struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type, 705 u16 msg_flags, struct ecryptfs_daemon *daemon); 706 void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx); 707 int 708 ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, uid_t euid, 709 struct user_namespace *user_ns, struct pid *pid); 710 int ecryptfs_init_kthread(void); 711 void ecryptfs_destroy_kthread(void); 712 int ecryptfs_privileged_open(struct file **lower_file, 713 struct dentry *lower_dentry, 714 struct vfsmount *lower_mnt); 715 int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry); 716 717 #endif /* #ifndef ECRYPTFS_KERNEL_H */ 718