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 <keys/encrypted-type.h> 33 #include <linux/fs.h> 34 #include <linux/fs_stack.h> 35 #include <linux/namei.h> 36 #include <linux/scatterlist.h> 37 #include <linux/hash.h> 38 #include <linux/nsproxy.h> 39 #include <linux/backing-dev.h> 40 #include <linux/ecryptfs.h> 41 42 #define ECRYPTFS_DEFAULT_IV_BYTES 16 43 #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096 44 #define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192 45 #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32 46 #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ 47 #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3) 48 #define ECRYPTFS_DEFAULT_NUM_USERS 4 49 #define ECRYPTFS_MAX_NUM_USERS 32768 50 #define ECRYPTFS_XATTR_NAME "user.ecryptfs" 51 52 void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok); 53 extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size); 54 extern void ecryptfs_from_hex(char *dst, char *src, int dst_size); 55 56 struct ecryptfs_key_record { 57 unsigned char type; 58 size_t enc_key_size; 59 unsigned char sig[ECRYPTFS_SIG_SIZE]; 60 unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES]; 61 }; 62 63 struct ecryptfs_auth_tok_list { 64 struct ecryptfs_auth_tok *auth_tok; 65 struct list_head list; 66 }; 67 68 struct ecryptfs_crypt_stat; 69 struct ecryptfs_mount_crypt_stat; 70 71 struct ecryptfs_page_crypt_context { 72 struct page *page; 73 #define ECRYPTFS_PREPARE_COMMIT_MODE 0 74 #define ECRYPTFS_WRITEPAGE_MODE 1 75 unsigned int mode; 76 union { 77 struct file *lower_file; 78 struct writeback_control *wbc; 79 } param; 80 }; 81 82 #if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE) 83 static inline struct ecryptfs_auth_tok * 84 ecryptfs_get_encrypted_key_payload_data(struct key *key) 85 { 86 if (key->type == &key_type_encrypted) 87 return (struct ecryptfs_auth_tok *) 88 (&((struct encrypted_key_payload *)key->payload.data)->payload_data); 89 else 90 return NULL; 91 } 92 93 static inline struct key *ecryptfs_get_encrypted_key(char *sig) 94 { 95 return request_key(&key_type_encrypted, sig, NULL); 96 } 97 98 #else 99 static inline struct ecryptfs_auth_tok * 100 ecryptfs_get_encrypted_key_payload_data(struct key *key) 101 { 102 return NULL; 103 } 104 105 static inline struct key *ecryptfs_get_encrypted_key(char *sig) 106 { 107 return ERR_PTR(-ENOKEY); 108 } 109 110 #endif /* CONFIG_ENCRYPTED_KEYS */ 111 112 static inline struct ecryptfs_auth_tok * 113 ecryptfs_get_key_payload_data(struct key *key) 114 { 115 struct ecryptfs_auth_tok *auth_tok; 116 117 auth_tok = ecryptfs_get_encrypted_key_payload_data(key); 118 if (!auth_tok) 119 return (struct ecryptfs_auth_tok *) 120 (((struct user_key_payload *)key->payload.data)->data); 121 else 122 return auth_tok; 123 } 124 125 #define ECRYPTFS_MAX_KEYSET_SIZE 1024 126 #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32 127 #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 struct ecryptfs_key_sig { 176 struct list_head crypt_stat_list; 177 char keysig[ECRYPTFS_SIG_SIZE_HEX + 1]; 178 }; 179 180 struct ecryptfs_filename { 181 struct list_head crypt_stat_list; 182 #define ECRYPTFS_FILENAME_CONTAINS_DECRYPTED 0x00000001 183 u32 flags; 184 u32 seq_no; 185 char *filename; 186 char *encrypted_filename; 187 size_t filename_size; 188 size_t encrypted_filename_size; 189 char fnek_sig[ECRYPTFS_SIG_SIZE_HEX]; 190 char dentry_name[ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN + 1]; 191 }; 192 193 /** 194 * This is the primary struct associated with each encrypted file. 195 * 196 * TODO: cache align/pack? 197 */ 198 struct ecryptfs_crypt_stat { 199 #define ECRYPTFS_STRUCT_INITIALIZED 0x00000001 200 #define ECRYPTFS_POLICY_APPLIED 0x00000002 201 #define ECRYPTFS_ENCRYPTED 0x00000004 202 #define ECRYPTFS_SECURITY_WARNING 0x00000008 203 #define ECRYPTFS_ENABLE_HMAC 0x00000010 204 #define ECRYPTFS_ENCRYPT_IV_PAGES 0x00000020 205 #define ECRYPTFS_KEY_VALID 0x00000040 206 #define ECRYPTFS_METADATA_IN_XATTR 0x00000080 207 #define ECRYPTFS_VIEW_AS_ENCRYPTED 0x00000100 208 #define ECRYPTFS_KEY_SET 0x00000200 209 #define ECRYPTFS_ENCRYPT_FILENAMES 0x00000400 210 #define ECRYPTFS_ENCFN_USE_MOUNT_FNEK 0x00000800 211 #define ECRYPTFS_ENCFN_USE_FEK 0x00001000 212 #define ECRYPTFS_UNLINK_SIGS 0x00002000 213 #define ECRYPTFS_I_SIZE_INITIALIZED 0x00004000 214 u32 flags; 215 unsigned int file_version; 216 size_t iv_bytes; 217 size_t metadata_size; 218 size_t extent_size; /* Data extent size; default is 4096 */ 219 size_t key_size; 220 size_t extent_shift; 221 unsigned int extent_mask; 222 struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 223 struct crypto_blkcipher *tfm; 224 struct crypto_hash *hash_tfm; /* Crypto context for generating 225 * the initialization vectors */ 226 unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE]; 227 unsigned char key[ECRYPTFS_MAX_KEY_BYTES]; 228 unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES]; 229 struct list_head keysig_list; 230 struct mutex keysig_list_mutex; 231 struct mutex cs_tfm_mutex; 232 struct mutex cs_hash_tfm_mutex; 233 struct mutex cs_mutex; 234 }; 235 236 /* inode private data. */ 237 struct ecryptfs_inode_info { 238 struct inode vfs_inode; 239 struct inode *wii_inode; 240 struct mutex lower_file_mutex; 241 atomic_t lower_file_count; 242 struct file *lower_file; 243 struct ecryptfs_crypt_stat crypt_stat; 244 }; 245 246 /* dentry private data. Each dentry must keep track of a lower 247 * vfsmount too. */ 248 struct ecryptfs_dentry_info { 249 struct path lower_path; 250 struct ecryptfs_crypt_stat *crypt_stat; 251 }; 252 253 /** 254 * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint 255 * @flags: Status flags 256 * @mount_crypt_stat_list: These auth_toks hang off the mount-wide 257 * cryptographic context. Every time a new 258 * inode comes into existence, eCryptfs copies 259 * the auth_toks on that list to the set of 260 * auth_toks on the inode's crypt_stat 261 * @global_auth_tok_key: The key from the user's keyring for the sig 262 * @global_auth_tok: The key contents 263 * @sig: The key identifier 264 * 265 * ecryptfs_global_auth_tok structs refer to authentication token keys 266 * in the user keyring that apply to newly created files. A list of 267 * these objects hangs off of the mount_crypt_stat struct for any 268 * given eCryptfs mount. This struct maintains a reference to both the 269 * key contents and the key itself so that the key can be put on 270 * unmount. 271 */ 272 struct ecryptfs_global_auth_tok { 273 #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001 274 #define ECRYPTFS_AUTH_TOK_FNEK 0x00000002 275 u32 flags; 276 struct list_head mount_crypt_stat_list; 277 struct key *global_auth_tok_key; 278 unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1]; 279 }; 280 281 /** 282 * ecryptfs_key_tfm - Persistent key tfm 283 * @key_tfm: crypto API handle to the key 284 * @key_size: Key size in bytes 285 * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is 286 * using the persistent TFM at any point in time 287 * @key_tfm_list: Handle to hang this off the module-wide TFM list 288 * @cipher_name: String name for the cipher for this TFM 289 * 290 * Typically, eCryptfs will use the same ciphers repeatedly throughout 291 * the course of its operations. In order to avoid unnecessarily 292 * destroying and initializing the same cipher repeatedly, eCryptfs 293 * keeps a list of crypto API contexts around to use when needed. 294 */ 295 struct ecryptfs_key_tfm { 296 struct crypto_blkcipher *key_tfm; 297 size_t key_size; 298 struct mutex key_tfm_mutex; 299 struct list_head key_tfm_list; 300 unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; 301 }; 302 303 extern struct mutex key_tfm_list_mutex; 304 305 /** 306 * This struct is to enable a mount-wide passphrase/salt combo. This 307 * is more or less a stopgap to provide similar functionality to other 308 * crypto filesystems like EncFS or CFS until full policy support is 309 * implemented in eCryptfs. 310 */ 311 struct ecryptfs_mount_crypt_stat { 312 /* Pointers to memory we do not own, do not free these */ 313 #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001 314 #define ECRYPTFS_XATTR_METADATA_ENABLED 0x00000002 315 #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED 0x00000004 316 #define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED 0x00000008 317 #define ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES 0x00000010 318 #define ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK 0x00000020 319 #define ECRYPTFS_GLOBAL_ENCFN_USE_FEK 0x00000040 320 #define ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY 0x00000080 321 u32 flags; 322 struct list_head global_auth_tok_list; 323 struct mutex global_auth_tok_list_mutex; 324 size_t global_default_cipher_key_size; 325 size_t global_default_fn_cipher_key_bytes; 326 unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE 327 + 1]; 328 unsigned char global_default_fn_cipher_name[ 329 ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; 330 char global_default_fnek_sig[ECRYPTFS_SIG_SIZE_HEX + 1]; 331 }; 332 333 /* superblock private data. */ 334 struct ecryptfs_sb_info { 335 struct super_block *wsi_sb; 336 struct ecryptfs_mount_crypt_stat mount_crypt_stat; 337 struct backing_dev_info bdi; 338 }; 339 340 /* file private data. */ 341 struct ecryptfs_file_info { 342 struct file *wfi_file; 343 struct ecryptfs_crypt_stat *crypt_stat; 344 }; 345 346 /* auth_tok <=> encrypted_session_key mappings */ 347 struct ecryptfs_auth_tok_list_item { 348 unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES]; 349 struct list_head list; 350 struct ecryptfs_auth_tok auth_tok; 351 }; 352 353 struct ecryptfs_message { 354 /* Can never be greater than ecryptfs_message_buf_len */ 355 /* Used to find the parent msg_ctx */ 356 /* Inherits from msg_ctx->index */ 357 u32 index; 358 u32 data_len; 359 u8 data[]; 360 }; 361 362 struct ecryptfs_msg_ctx { 363 #define ECRYPTFS_MSG_CTX_STATE_FREE 0x01 364 #define ECRYPTFS_MSG_CTX_STATE_PENDING 0x02 365 #define ECRYPTFS_MSG_CTX_STATE_DONE 0x03 366 #define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04 367 u8 state; 368 #define ECRYPTFS_MSG_HELO 100 369 #define ECRYPTFS_MSG_QUIT 101 370 #define ECRYPTFS_MSG_REQUEST 102 371 #define ECRYPTFS_MSG_RESPONSE 103 372 u8 type; 373 u32 index; 374 /* Counter converts to a sequence number. Each message sent 375 * out for which we expect a response has an associated 376 * sequence number. The response must have the same sequence 377 * number as the counter for the msg_stc for the message to be 378 * valid. */ 379 u32 counter; 380 size_t msg_size; 381 struct ecryptfs_message *msg; 382 struct task_struct *task; 383 struct list_head node; 384 struct list_head daemon_out_list; 385 struct mutex mux; 386 }; 387 388 struct ecryptfs_daemon; 389 390 struct ecryptfs_daemon { 391 #define ECRYPTFS_DAEMON_IN_READ 0x00000001 392 #define ECRYPTFS_DAEMON_IN_POLL 0x00000002 393 #define ECRYPTFS_DAEMON_ZOMBIE 0x00000004 394 #define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008 395 u32 flags; 396 u32 num_queued_msg_ctx; 397 struct pid *pid; 398 uid_t euid; 399 struct user_namespace *user_ns; 400 struct task_struct *task; 401 struct mutex mux; 402 struct list_head msg_ctx_out_queue; 403 wait_queue_head_t wait; 404 struct hlist_node euid_chain; 405 }; 406 407 extern struct mutex ecryptfs_daemon_hash_mux; 408 409 static inline size_t 410 ecryptfs_lower_header_size(struct ecryptfs_crypt_stat *crypt_stat) 411 { 412 if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) 413 return 0; 414 return crypt_stat->metadata_size; 415 } 416 417 static inline struct ecryptfs_file_info * 418 ecryptfs_file_to_private(struct file *file) 419 { 420 return file->private_data; 421 } 422 423 static inline void 424 ecryptfs_set_file_private(struct file *file, 425 struct ecryptfs_file_info *file_info) 426 { 427 file->private_data = file_info; 428 } 429 430 static inline struct file *ecryptfs_file_to_lower(struct file *file) 431 { 432 return ((struct ecryptfs_file_info *)file->private_data)->wfi_file; 433 } 434 435 static inline void 436 ecryptfs_set_file_lower(struct file *file, struct file *lower_file) 437 { 438 ((struct ecryptfs_file_info *)file->private_data)->wfi_file = 439 lower_file; 440 } 441 442 static inline struct ecryptfs_inode_info * 443 ecryptfs_inode_to_private(struct inode *inode) 444 { 445 return container_of(inode, struct ecryptfs_inode_info, vfs_inode); 446 } 447 448 static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode) 449 { 450 return ecryptfs_inode_to_private(inode)->wii_inode; 451 } 452 453 static inline void 454 ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode) 455 { 456 ecryptfs_inode_to_private(inode)->wii_inode = lower_inode; 457 } 458 459 static inline struct ecryptfs_sb_info * 460 ecryptfs_superblock_to_private(struct super_block *sb) 461 { 462 return (struct ecryptfs_sb_info *)sb->s_fs_info; 463 } 464 465 static inline void 466 ecryptfs_set_superblock_private(struct super_block *sb, 467 struct ecryptfs_sb_info *sb_info) 468 { 469 sb->s_fs_info = sb_info; 470 } 471 472 static inline struct super_block * 473 ecryptfs_superblock_to_lower(struct super_block *sb) 474 { 475 return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb; 476 } 477 478 static inline void 479 ecryptfs_set_superblock_lower(struct super_block *sb, 480 struct super_block *lower_sb) 481 { 482 ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb; 483 } 484 485 static inline struct ecryptfs_dentry_info * 486 ecryptfs_dentry_to_private(struct dentry *dentry) 487 { 488 return (struct ecryptfs_dentry_info *)dentry->d_fsdata; 489 } 490 491 static inline void 492 ecryptfs_set_dentry_private(struct dentry *dentry, 493 struct ecryptfs_dentry_info *dentry_info) 494 { 495 dentry->d_fsdata = dentry_info; 496 } 497 498 static inline struct dentry * 499 ecryptfs_dentry_to_lower(struct dentry *dentry) 500 { 501 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry; 502 } 503 504 static inline void 505 ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry) 506 { 507 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry = 508 lower_dentry; 509 } 510 511 static inline struct vfsmount * 512 ecryptfs_dentry_to_lower_mnt(struct dentry *dentry) 513 { 514 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt; 515 } 516 517 static inline void 518 ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt) 519 { 520 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt = 521 lower_mnt; 522 } 523 524 #define ecryptfs_printk(type, fmt, arg...) \ 525 __ecryptfs_printk(type "%s: " fmt, __func__, ## arg); 526 __printf(1, 2) 527 void __ecryptfs_printk(const char *fmt, ...); 528 529 extern const struct file_operations ecryptfs_main_fops; 530 extern const struct file_operations ecryptfs_dir_fops; 531 extern const struct inode_operations ecryptfs_main_iops; 532 extern const struct inode_operations ecryptfs_dir_iops; 533 extern const struct inode_operations ecryptfs_symlink_iops; 534 extern const struct super_operations ecryptfs_sops; 535 extern const struct dentry_operations ecryptfs_dops; 536 extern const struct address_space_operations ecryptfs_aops; 537 extern int ecryptfs_verbosity; 538 extern unsigned int ecryptfs_message_buf_len; 539 extern signed long ecryptfs_message_wait_timeout; 540 extern unsigned int ecryptfs_number_of_users; 541 542 extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache; 543 extern struct kmem_cache *ecryptfs_file_info_cache; 544 extern struct kmem_cache *ecryptfs_dentry_info_cache; 545 extern struct kmem_cache *ecryptfs_inode_info_cache; 546 extern struct kmem_cache *ecryptfs_sb_info_cache; 547 extern struct kmem_cache *ecryptfs_header_cache; 548 extern struct kmem_cache *ecryptfs_xattr_cache; 549 extern struct kmem_cache *ecryptfs_key_record_cache; 550 extern struct kmem_cache *ecryptfs_key_sig_cache; 551 extern struct kmem_cache *ecryptfs_global_auth_tok_cache; 552 extern struct kmem_cache *ecryptfs_key_tfm_cache; 553 extern struct kmem_cache *ecryptfs_open_req_cache; 554 555 struct ecryptfs_open_req { 556 #define ECRYPTFS_REQ_PROCESSED 0x00000001 557 #define ECRYPTFS_REQ_DROPPED 0x00000002 558 #define ECRYPTFS_REQ_ZOMBIE 0x00000004 559 u32 flags; 560 struct file **lower_file; 561 struct dentry *lower_dentry; 562 struct vfsmount *lower_mnt; 563 wait_queue_head_t wait; 564 struct mutex mux; 565 struct list_head kthread_ctl_list; 566 }; 567 568 struct inode *ecryptfs_get_inode(struct inode *lower_inode, 569 struct super_block *sb); 570 void ecryptfs_i_size_init(const char *page_virt, struct inode *inode); 571 int ecryptfs_decode_and_decrypt_filename(char **decrypted_name, 572 size_t *decrypted_name_size, 573 struct dentry *ecryptfs_dentry, 574 const char *name, size_t name_size); 575 int ecryptfs_fill_zeros(struct file *file, loff_t new_length); 576 int ecryptfs_encrypt_and_encode_filename( 577 char **encoded_name, 578 size_t *encoded_name_size, 579 struct ecryptfs_crypt_stat *crypt_stat, 580 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, 581 const char *name, size_t name_size); 582 struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry); 583 void ecryptfs_dump_hex(char *data, int bytes); 584 int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg, 585 int sg_size); 586 int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat); 587 void ecryptfs_rotate_iv(unsigned char *iv); 588 void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); 589 void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); 590 void ecryptfs_destroy_mount_crypt_stat( 591 struct ecryptfs_mount_crypt_stat *mount_crypt_stat); 592 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat); 593 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode); 594 int ecryptfs_encrypt_page(struct page *page); 595 int ecryptfs_decrypt_page(struct page *page); 596 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry, 597 struct inode *ecryptfs_inode); 598 int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry); 599 int ecryptfs_new_file_context(struct inode *ecryptfs_inode); 600 void ecryptfs_write_crypt_stat_flags(char *page_virt, 601 struct ecryptfs_crypt_stat *crypt_stat, 602 size_t *written); 603 int ecryptfs_read_and_validate_header_region(struct inode *inode); 604 int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry, 605 struct inode *inode); 606 u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes); 607 int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code); 608 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat); 609 int ecryptfs_generate_key_packet_set(char *dest_base, 610 struct ecryptfs_crypt_stat *crypt_stat, 611 struct dentry *ecryptfs_dentry, 612 size_t *len, size_t max); 613 int 614 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat, 615 unsigned char *src, struct dentry *ecryptfs_dentry); 616 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length); 617 ssize_t 618 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 619 void *value, size_t size); 620 int 621 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 622 size_t size, int flags); 623 int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode); 624 int ecryptfs_process_helo(uid_t euid, struct user_namespace *user_ns, 625 struct pid *pid); 626 int ecryptfs_process_quit(uid_t euid, struct user_namespace *user_ns, 627 struct pid *pid); 628 int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid, 629 struct user_namespace *user_ns, struct pid *pid, 630 u32 seq); 631 int ecryptfs_send_message(char *data, int data_len, 632 struct ecryptfs_msg_ctx **msg_ctx); 633 int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx, 634 struct ecryptfs_message **emsg); 635 int ecryptfs_init_messaging(void); 636 void ecryptfs_release_messaging(void); 637 638 void 639 ecryptfs_write_header_metadata(char *virt, 640 struct ecryptfs_crypt_stat *crypt_stat, 641 size_t *written); 642 int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig); 643 int 644 ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat, 645 char *sig, u32 global_auth_tok_flags); 646 int ecryptfs_get_global_auth_tok_for_sig( 647 struct ecryptfs_global_auth_tok **global_auth_tok, 648 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig); 649 int 650 ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name, 651 size_t key_size); 652 int ecryptfs_init_crypto(void); 653 int ecryptfs_destroy_crypto(void); 654 int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm); 655 int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm, 656 struct mutex **tfm_mutex, 657 char *cipher_name); 658 int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key, 659 struct ecryptfs_auth_tok **auth_tok, 660 char *sig); 661 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data, 662 loff_t offset, size_t size); 663 int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode, 664 struct page *page_for_lower, 665 size_t offset_in_page, size_t size); 666 int ecryptfs_write(struct inode *inode, char *data, loff_t offset, size_t size); 667 int ecryptfs_read_lower(char *data, loff_t offset, size_t size, 668 struct inode *ecryptfs_inode); 669 int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs, 670 pgoff_t page_index, 671 size_t offset_in_page, size_t size, 672 struct inode *ecryptfs_inode); 673 struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index); 674 int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon); 675 int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon, uid_t euid, 676 struct user_namespace *user_ns); 677 int ecryptfs_parse_packet_length(unsigned char *data, size_t *size, 678 size_t *length_size); 679 int ecryptfs_write_packet_length(char *dest, size_t size, 680 size_t *packet_size_length); 681 int ecryptfs_init_ecryptfs_miscdev(void); 682 void ecryptfs_destroy_ecryptfs_miscdev(void); 683 int ecryptfs_send_miscdev(char *data, size_t data_size, 684 struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type, 685 u16 msg_flags, struct ecryptfs_daemon *daemon); 686 void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx); 687 int 688 ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, uid_t euid, 689 struct user_namespace *user_ns, struct pid *pid); 690 int ecryptfs_init_kthread(void); 691 void ecryptfs_destroy_kthread(void); 692 int ecryptfs_privileged_open(struct file **lower_file, 693 struct dentry *lower_dentry, 694 struct vfsmount *lower_mnt, 695 const struct cred *cred); 696 int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode); 697 void ecryptfs_put_lower_file(struct inode *inode); 698 int 699 ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes, 700 size_t *packet_size, 701 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, 702 char *filename, size_t filename_size); 703 int 704 ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size, 705 size_t *packet_size, 706 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, 707 char *data, size_t max_packet_size); 708 int ecryptfs_set_f_namelen(long *namelen, long lower_namelen, 709 struct ecryptfs_mount_crypt_stat *mount_crypt_stat); 710 int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat, 711 loff_t offset); 712 713 #endif /* #ifndef ECRYPTFS_KERNEL_H */ 714