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 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 /* 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 extern unsigned int ecryptfs_transport; 404 405 struct ecryptfs_daemon; 406 407 struct ecryptfs_daemon { 408 #define ECRYPTFS_DAEMON_IN_READ 0x00000001 409 #define ECRYPTFS_DAEMON_IN_POLL 0x00000002 410 #define ECRYPTFS_DAEMON_ZOMBIE 0x00000004 411 #define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008 412 u32 flags; 413 u32 num_queued_msg_ctx; 414 struct pid *pid; 415 uid_t euid; 416 struct user_namespace *user_ns; 417 struct task_struct *task; 418 struct mutex mux; 419 struct list_head msg_ctx_out_queue; 420 wait_queue_head_t wait; 421 struct hlist_node euid_chain; 422 }; 423 424 extern struct mutex ecryptfs_daemon_hash_mux; 425 426 static inline struct ecryptfs_file_info * 427 ecryptfs_file_to_private(struct file *file) 428 { 429 return (struct ecryptfs_file_info *)file->private_data; 430 } 431 432 static inline void 433 ecryptfs_set_file_private(struct file *file, 434 struct ecryptfs_file_info *file_info) 435 { 436 file->private_data = file_info; 437 } 438 439 static inline struct file *ecryptfs_file_to_lower(struct file *file) 440 { 441 return ((struct ecryptfs_file_info *)file->private_data)->wfi_file; 442 } 443 444 static inline void 445 ecryptfs_set_file_lower(struct file *file, struct file *lower_file) 446 { 447 ((struct ecryptfs_file_info *)file->private_data)->wfi_file = 448 lower_file; 449 } 450 451 static inline struct ecryptfs_inode_info * 452 ecryptfs_inode_to_private(struct inode *inode) 453 { 454 return container_of(inode, struct ecryptfs_inode_info, vfs_inode); 455 } 456 457 static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode) 458 { 459 return ecryptfs_inode_to_private(inode)->wii_inode; 460 } 461 462 static inline void 463 ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode) 464 { 465 ecryptfs_inode_to_private(inode)->wii_inode = lower_inode; 466 } 467 468 static inline struct ecryptfs_sb_info * 469 ecryptfs_superblock_to_private(struct super_block *sb) 470 { 471 return (struct ecryptfs_sb_info *)sb->s_fs_info; 472 } 473 474 static inline void 475 ecryptfs_set_superblock_private(struct super_block *sb, 476 struct ecryptfs_sb_info *sb_info) 477 { 478 sb->s_fs_info = sb_info; 479 } 480 481 static inline struct super_block * 482 ecryptfs_superblock_to_lower(struct super_block *sb) 483 { 484 return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb; 485 } 486 487 static inline void 488 ecryptfs_set_superblock_lower(struct super_block *sb, 489 struct super_block *lower_sb) 490 { 491 ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb; 492 } 493 494 static inline struct ecryptfs_dentry_info * 495 ecryptfs_dentry_to_private(struct dentry *dentry) 496 { 497 return (struct ecryptfs_dentry_info *)dentry->d_fsdata; 498 } 499 500 static inline void 501 ecryptfs_set_dentry_private(struct dentry *dentry, 502 struct ecryptfs_dentry_info *dentry_info) 503 { 504 dentry->d_fsdata = dentry_info; 505 } 506 507 static inline struct dentry * 508 ecryptfs_dentry_to_lower(struct dentry *dentry) 509 { 510 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry; 511 } 512 513 static inline void 514 ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry) 515 { 516 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry = 517 lower_dentry; 518 } 519 520 static inline struct vfsmount * 521 ecryptfs_dentry_to_lower_mnt(struct dentry *dentry) 522 { 523 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt; 524 } 525 526 static inline void 527 ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt) 528 { 529 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt = 530 lower_mnt; 531 } 532 533 #define ecryptfs_printk(type, fmt, arg...) \ 534 __ecryptfs_printk(type "%s: " fmt, __func__, ## arg); 535 void __ecryptfs_printk(const char *fmt, ...); 536 537 extern const struct file_operations ecryptfs_main_fops; 538 extern const struct file_operations ecryptfs_dir_fops; 539 extern const struct inode_operations ecryptfs_main_iops; 540 extern const struct inode_operations ecryptfs_dir_iops; 541 extern const struct inode_operations ecryptfs_symlink_iops; 542 extern const struct super_operations ecryptfs_sops; 543 extern struct dentry_operations ecryptfs_dops; 544 extern struct address_space_operations ecryptfs_aops; 545 extern int ecryptfs_verbosity; 546 extern unsigned int ecryptfs_message_buf_len; 547 extern signed long ecryptfs_message_wait_timeout; 548 extern unsigned int ecryptfs_number_of_users; 549 550 extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache; 551 extern struct kmem_cache *ecryptfs_file_info_cache; 552 extern struct kmem_cache *ecryptfs_dentry_info_cache; 553 extern struct kmem_cache *ecryptfs_inode_info_cache; 554 extern struct kmem_cache *ecryptfs_sb_info_cache; 555 extern struct kmem_cache *ecryptfs_header_cache_1; 556 extern struct kmem_cache *ecryptfs_header_cache_2; 557 extern struct kmem_cache *ecryptfs_xattr_cache; 558 extern struct kmem_cache *ecryptfs_key_record_cache; 559 extern struct kmem_cache *ecryptfs_key_sig_cache; 560 extern struct kmem_cache *ecryptfs_global_auth_tok_cache; 561 extern struct kmem_cache *ecryptfs_key_tfm_cache; 562 extern struct kmem_cache *ecryptfs_open_req_cache; 563 564 struct ecryptfs_open_req { 565 #define ECRYPTFS_REQ_PROCESSED 0x00000001 566 #define ECRYPTFS_REQ_DROPPED 0x00000002 567 #define ECRYPTFS_REQ_ZOMBIE 0x00000004 568 u32 flags; 569 struct file **lower_file; 570 struct dentry *lower_dentry; 571 struct vfsmount *lower_mnt; 572 wait_queue_head_t wait; 573 struct mutex mux; 574 struct list_head kthread_ctl_list; 575 }; 576 577 #define ECRYPTFS_INTERPOSE_FLAG_D_ADD 0x00000001 578 int ecryptfs_interpose(struct dentry *hidden_dentry, 579 struct dentry *this_dentry, struct super_block *sb, 580 u32 flags); 581 int ecryptfs_fill_zeros(struct file *file, loff_t new_length); 582 int ecryptfs_decode_filename(struct ecryptfs_crypt_stat *crypt_stat, 583 const char *name, int length, 584 char **decrypted_name); 585 int ecryptfs_encode_filename(struct ecryptfs_crypt_stat *crypt_stat, 586 const char *name, int length, 587 char **encoded_name); 588 struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry); 589 void ecryptfs_dump_hex(char *data, int bytes); 590 int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg, 591 int sg_size); 592 int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat); 593 void ecryptfs_rotate_iv(unsigned char *iv); 594 void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); 595 void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); 596 void ecryptfs_destroy_mount_crypt_stat( 597 struct ecryptfs_mount_crypt_stat *mount_crypt_stat); 598 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat); 599 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode); 600 int ecryptfs_encrypt_page(struct page *page); 601 int ecryptfs_decrypt_page(struct page *page); 602 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry); 603 int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry); 604 int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry); 605 int ecryptfs_read_and_validate_header_region(char *data, 606 struct inode *ecryptfs_inode); 607 int ecryptfs_read_and_validate_xattr_region(char *page_virt, 608 struct dentry *ecryptfs_dentry); 609 u8 ecryptfs_code_for_cipher_string(struct ecryptfs_crypt_stat *crypt_stat); 610 int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code); 611 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat); 612 int ecryptfs_generate_key_packet_set(char *dest_base, 613 struct ecryptfs_crypt_stat *crypt_stat, 614 struct dentry *ecryptfs_dentry, 615 size_t *len, size_t max); 616 int 617 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat, 618 unsigned char *src, struct dentry *ecryptfs_dentry); 619 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length); 620 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode); 621 int ecryptfs_inode_set(struct inode *inode, void *lower_inode); 622 void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode); 623 ssize_t 624 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 625 void *value, size_t size); 626 int 627 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 628 size_t size, int flags); 629 int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode); 630 int ecryptfs_process_helo(unsigned int transport, uid_t euid, 631 struct user_namespace *user_ns, struct pid *pid); 632 int ecryptfs_process_quit(uid_t euid, struct user_namespace *user_ns, 633 struct pid *pid); 634 int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid, 635 struct user_namespace *user_ns, struct pid *pid, 636 u32 seq); 637 int ecryptfs_send_message(unsigned int transport, char *data, int data_len, 638 struct ecryptfs_msg_ctx **msg_ctx); 639 int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx, 640 struct ecryptfs_message **emsg); 641 int ecryptfs_init_messaging(unsigned int transport); 642 void ecryptfs_release_messaging(unsigned int transport); 643 644 int ecryptfs_send_netlink(char *data, int data_len, 645 struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type, 646 u16 msg_flags, struct pid *daemon_pid); 647 int ecryptfs_init_netlink(void); 648 void ecryptfs_release_netlink(void); 649 650 int ecryptfs_send_connector(char *data, int data_len, 651 struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type, 652 u16 msg_flags, struct pid *daemon_pid); 653 int ecryptfs_init_connector(void); 654 void ecryptfs_release_connector(void); 655 void 656 ecryptfs_write_header_metadata(char *virt, 657 struct ecryptfs_crypt_stat *crypt_stat, 658 size_t *written); 659 int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig); 660 int 661 ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat, 662 char *sig); 663 int ecryptfs_get_global_auth_tok_for_sig( 664 struct ecryptfs_global_auth_tok **global_auth_tok, 665 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig); 666 int 667 ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name, 668 size_t key_size); 669 int ecryptfs_init_crypto(void); 670 int ecryptfs_destroy_crypto(void); 671 int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm); 672 int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm, 673 struct mutex **tfm_mutex, 674 char *cipher_name); 675 int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key, 676 struct ecryptfs_auth_tok **auth_tok, 677 char *sig); 678 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data, 679 loff_t offset, size_t size); 680 int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode, 681 struct page *page_for_lower, 682 size_t offset_in_page, size_t size); 683 int ecryptfs_write(struct file *ecryptfs_file, char *data, loff_t offset, 684 size_t size); 685 int ecryptfs_read_lower(char *data, loff_t offset, size_t size, 686 struct inode *ecryptfs_inode); 687 int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs, 688 pgoff_t page_index, 689 size_t offset_in_page, size_t size, 690 struct inode *ecryptfs_inode); 691 struct page *ecryptfs_get_locked_page(struct file *file, loff_t index); 692 int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon); 693 int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon, uid_t euid, 694 struct user_namespace *user_ns); 695 int ecryptfs_parse_packet_length(unsigned char *data, size_t *size, 696 size_t *length_size); 697 int ecryptfs_write_packet_length(char *dest, size_t size, 698 size_t *packet_size_length); 699 int ecryptfs_init_ecryptfs_miscdev(void); 700 void ecryptfs_destroy_ecryptfs_miscdev(void); 701 int ecryptfs_send_miscdev(char *data, size_t data_size, 702 struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type, 703 u16 msg_flags, struct ecryptfs_daemon *daemon); 704 void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx); 705 int 706 ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, uid_t euid, 707 struct user_namespace *user_ns, struct pid *pid); 708 int ecryptfs_init_kthread(void); 709 void ecryptfs_destroy_kthread(void); 710 int ecryptfs_privileged_open(struct file **lower_file, 711 struct dentry *lower_dentry, 712 struct vfsmount *lower_mnt); 713 int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry); 714 715 #endif /* #ifndef ECRYPTFS_KERNEL_H */ 716