fs/ecryptfs/ecryptfs_kernel.h

   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 };
 353
 354 /* file private data. */
 355 struct ecryptfs_file_info {
 356         struct file *wfi_file;
 357         struct ecryptfs_crypt_stat *crypt_stat;
 358 };
 359
 360 /* auth_tok <=> encrypted_session_key mappings */
 361 struct ecryptfs_auth_tok_list_item {
 362         unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES];
 363         struct list_head list;
 364         struct ecryptfs_auth_tok auth_tok;
 365 };
 366
 367 struct ecryptfs_message {
 368         /* Can never be greater than ecryptfs_message_buf_len */
 369         /* Used to find the parent msg_ctx */
 370         /* Inherits from msg_ctx->index */
 371         u32 index;
 372         u32 data_len;
 373         u8 data[];
 374 };
 375
 376 struct ecryptfs_msg_ctx {
 377 #define ECRYPTFS_MSG_CTX_STATE_FREE     0x01
 378 #define ECRYPTFS_MSG_CTX_STATE_PENDING  0x02
 379 #define ECRYPTFS_MSG_CTX_STATE_DONE     0x03
 380 #define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04
 381         u8 state;
 382 #define ECRYPTFS_MSG_HELO 100
 383 #define ECRYPTFS_MSG_QUIT 101
 384 #define ECRYPTFS_MSG_REQUEST 102
 385 #define ECRYPTFS_MSG_RESPONSE 103
 386         u8 type;
 387         u32 index;
 388         /* Counter converts to a sequence number. Each message sent
 389          * out for which we expect a response has an associated
 390          * sequence number. The response must have the same sequence
 391          * number as the counter for the msg_stc for the message to be
 392          * valid. */
 393         u32 counter;
 394         size_t msg_size;
 395         struct ecryptfs_message *msg;
 396         struct task_struct *task;
 397         struct list_head node;
 398         struct list_head daemon_out_list;
 399         struct mutex mux;
 400 };
 401
 402 struct ecryptfs_daemon {
 403 #define ECRYPTFS_DAEMON_IN_READ      0x00000001
 404 #define ECRYPTFS_DAEMON_IN_POLL      0x00000002
 405 #define ECRYPTFS_DAEMON_ZOMBIE       0x00000004
 406 #define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008
 407         u32 flags;
 408         u32 num_queued_msg_ctx;
 409         struct file *file;
 410         struct mutex mux;
 411         struct list_head msg_ctx_out_queue;
 412         wait_queue_head_t wait;
 413         struct hlist_node euid_chain;
 414 };
 415
 416 #ifdef CONFIG_ECRYPT_FS_MESSAGING
 417 extern struct mutex ecryptfs_daemon_hash_mux;
 418 #endif
 419
 420 static inline size_t
 421 ecryptfs_lower_header_size(struct ecryptfs_crypt_stat *crypt_stat)
 422 {
 423         if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
 424                 return 0;
 425         return crypt_stat->metadata_size;
 426 }
 427
 428 static inline struct ecryptfs_file_info *
 429 ecryptfs_file_to_private(struct file *file)
 430 {
 431         return file->private_data;
 432 }
 433
 434 static inline void
 435 ecryptfs_set_file_private(struct file *file,
 436                           struct ecryptfs_file_info *file_info)
 437 {
 438         file->private_data = file_info;
 439 }
 440
 441 static inline struct file *ecryptfs_file_to_lower(struct file *file)
 442 {
 443         return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;
 444 }
 445
 446 static inline void
 447 ecryptfs_set_file_lower(struct file *file, struct file *lower_file)
 448 {
 449         ((struct ecryptfs_file_info *)file->private_data)->wfi_file =
 450                 lower_file;
 451 }
 452
 453 static inline struct ecryptfs_inode_info *
 454 ecryptfs_inode_to_private(struct inode *inode)
 455 {
 456         return container_of(inode, struct ecryptfs_inode_info, vfs_inode);
 457 }
 458
 459 static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode)
 460 {
 461         return ecryptfs_inode_to_private(inode)->wii_inode;
 462 }
 463
 464 static inline void
 465 ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode)
 466 {
 467         ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;
 468 }
 469
 470 static inline struct ecryptfs_sb_info *
 471 ecryptfs_superblock_to_private(struct super_block *sb)
 472 {
 473         return (struct ecryptfs_sb_info *)sb->s_fs_info;
 474 }
 475
 476 static inline void
 477 ecryptfs_set_superblock_private(struct super_block *sb,
 478                                 struct ecryptfs_sb_info *sb_info)
 479 {
 480         sb->s_fs_info = sb_info;
 481 }
 482
 483 static inline struct super_block *
 484 ecryptfs_superblock_to_lower(struct super_block *sb)
 485 {
 486         return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;
 487 }
 488
 489 static inline void
 490 ecryptfs_set_superblock_lower(struct super_block *sb,
 491                               struct super_block *lower_sb)
 492 {
 493         ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb;
 494 }
 495
 496 static inline struct ecryptfs_dentry_info *
 497 ecryptfs_dentry_to_private(struct dentry *dentry)
 498 {
 499         return (struct ecryptfs_dentry_info *)dentry->d_fsdata;
 500 }
 501
 502 static inline void
 503 ecryptfs_set_dentry_private(struct dentry *dentry,
 504                             struct ecryptfs_dentry_info *dentry_info)
 505 {
 506         dentry->d_fsdata = dentry_info;
 507 }
 508
 509 static inline struct dentry *
 510 ecryptfs_dentry_to_lower(struct dentry *dentry)
 511 {
 512         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
 513 }
 514
 515 static inline struct vfsmount *
 516 ecryptfs_dentry_to_lower_mnt(struct dentry *dentry)
 517 {
 518         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;
 519 }
 520
 521 static inline struct path *
 522 ecryptfs_dentry_to_lower_path(struct dentry *dentry)
 523 {
 524         return &((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path;
 525 }
 526
 527 #define ecryptfs_printk(type, fmt, arg...) \
 528         __ecryptfs_printk(type "%s: " fmt, __func__, ## arg);
 529 __printf(1, 2)
 530 void __ecryptfs_printk(const char *fmt, ...);
 531
 532 extern const struct file_operations ecryptfs_main_fops;
 533 extern const struct file_operations ecryptfs_dir_fops;
 534 extern const struct inode_operations ecryptfs_main_iops;
 535 extern const struct inode_operations ecryptfs_dir_iops;
 536 extern const struct inode_operations ecryptfs_symlink_iops;
 537 extern const struct super_operations ecryptfs_sops;
 538 extern const struct dentry_operations ecryptfs_dops;
 539 extern const struct address_space_operations ecryptfs_aops;
 540 extern int ecryptfs_verbosity;
 541 extern unsigned int ecryptfs_message_buf_len;
 542 extern signed long ecryptfs_message_wait_timeout;
 543 extern unsigned int ecryptfs_number_of_users;
 544
 545 extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;
 546 extern struct kmem_cache *ecryptfs_file_info_cache;
 547 extern struct kmem_cache *ecryptfs_dentry_info_cache;
 548 extern struct kmem_cache *ecryptfs_inode_info_cache;
 549 extern struct kmem_cache *ecryptfs_sb_info_cache;
 550 extern struct kmem_cache *ecryptfs_header_cache;
 551 extern struct kmem_cache *ecryptfs_xattr_cache;
 552 extern struct kmem_cache *ecryptfs_key_record_cache;
 553 extern struct kmem_cache *ecryptfs_key_sig_cache;
 554 extern struct kmem_cache *ecryptfs_global_auth_tok_cache;
 555 extern struct kmem_cache *ecryptfs_key_tfm_cache;
 556
 557 struct inode *ecryptfs_get_inode(struct inode *lower_inode,
 558                                  struct super_block *sb);
 559 void ecryptfs_i_size_init(const char *page_virt, struct inode *inode);
 560 int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
 561                              struct inode *ecryptfs_inode);
 562 int ecryptfs_decode_and_decrypt_filename(char **decrypted_name,
 563                                          size_t *decrypted_name_size,
 564                                          struct super_block *sb,
 565                                          const char *name, size_t name_size);
 566 int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
 567 int ecryptfs_encrypt_and_encode_filename(
 568         char **encoded_name,
 569         size_t *encoded_name_size,
 570         struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 571         const char *name, size_t name_size);
 572 struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);
 573 void ecryptfs_dump_hex(char *data, int bytes);
 574 int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
 575                         int sg_size);
 576 int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);
 577 void ecryptfs_rotate_iv(unsigned char *iv);
 578 int ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
 579 void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
 580 void ecryptfs_destroy_mount_crypt_stat(
 581         struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
 582 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
 583 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode);
 584 int ecryptfs_encrypt_page(struct page *page);
 585 int ecryptfs_decrypt_page(struct page *page);
 586 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry,
 587                             struct inode *ecryptfs_inode);
 588 int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry);
 589 int ecryptfs_new_file_context(struct inode *ecryptfs_inode);
 590 void ecryptfs_write_crypt_stat_flags(char *page_virt,
 591                                      struct ecryptfs_crypt_stat *crypt_stat,
 592                                      size_t *written);
 593 int ecryptfs_read_and_validate_header_region(struct inode *inode);
 594 int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry,
 595                                             struct inode *inode);
 596 u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes);
 597 int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code);
 598 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
 599 int ecryptfs_generate_key_packet_set(char *dest_base,
 600                                      struct ecryptfs_crypt_stat *crypt_stat,
 601                                      struct dentry *ecryptfs_dentry,
 602                                      size_t *len, size_t max);
 603 int
 604 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
 605                           unsigned char *src, struct dentry *ecryptfs_dentry);
 606 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
 607 ssize_t
 608 ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode,
 609                         const char *name, void *value, size_t size);
 610 int
 611 ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, const char *name,
 612                   const void *value, size_t size, int flags);
 613 int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode);
 614 #ifdef CONFIG_ECRYPT_FS_MESSAGING
 615 int ecryptfs_process_response(struct ecryptfs_daemon *daemon,
 616                               struct ecryptfs_message *msg, u32 seq);
 617 int ecryptfs_send_message(char *data, int data_len,
 618                           struct ecryptfs_msg_ctx **msg_ctx);
 619 int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
 620                                struct ecryptfs_message **emsg);
 621 int ecryptfs_init_messaging(void);
 622 void ecryptfs_release_messaging(void);
 623 #else
 624 static inline int ecryptfs_init_messaging(void)
 625 {
 626         return 0;
 627 }
 628 static inline void ecryptfs_release_messaging(void)
 629 { }
 630 static inline int ecryptfs_send_message(char *data, int data_len,
 631                                         struct ecryptfs_msg_ctx **msg_ctx)
 632 {
 633         return -ENOTCONN;
 634 }
 635 static inline int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
 636                                              struct ecryptfs_message **emsg)
 637 {
 638         return -ENOMSG;
 639 }
 640 #endif
 641
 642 void
 643 ecryptfs_write_header_metadata(char *virt,
 644                                struct ecryptfs_crypt_stat *crypt_stat,
 645                                size_t *written);
 646 int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig);
 647 int
 648 ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 649                            char *sig, u32 global_auth_tok_flags);
 650 int ecryptfs_get_global_auth_tok_for_sig(
 651         struct ecryptfs_global_auth_tok **global_auth_tok,
 652         struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig);
 653 int
 654 ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
 655                          size_t key_size);
 656 int ecryptfs_init_crypto(void);
 657 int ecryptfs_destroy_crypto(void);
 658 int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm);
 659 int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_skcipher **tfm,
 660                                                struct mutex **tfm_mutex,
 661                                                char *cipher_name);
 662 int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
 663                                       struct ecryptfs_auth_tok **auth_tok,
 664                                       char *sig);
 665 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
 666                          loff_t offset, size_t size);
 667 int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
 668                                       struct page *page_for_lower,
 669                                       size_t offset_in_page, size_t size);
 670 int ecryptfs_write(struct inode *inode, char *data, loff_t offset, size_t size);
 671 int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
 672                         struct inode *ecryptfs_inode);
 673 int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
 674                                      pgoff_t page_index,
 675                                      size_t offset_in_page, size_t size,
 676                                      struct inode *ecryptfs_inode);
 677 struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index);
 678 int ecryptfs_parse_packet_length(unsigned char *data, size_t *size,
 679                                  size_t *length_size);
 680 int ecryptfs_write_packet_length(char *dest, size_t size,
 681                                  size_t *packet_size_length);
 682 #ifdef CONFIG_ECRYPT_FS_MESSAGING
 683 int ecryptfs_init_ecryptfs_miscdev(void);
 684 void ecryptfs_destroy_ecryptfs_miscdev(void);
 685 int ecryptfs_send_miscdev(char *data, size_t data_size,
 686                           struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
 687                           u16 msg_flags, struct ecryptfs_daemon *daemon);
 688 void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx);
 689 int
 690 ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, struct file *file);
 691 int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon);
 692 int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon);
 693 #endif
 694 int ecryptfs_init_kthread(void);
 695 void ecryptfs_destroy_kthread(void);
 696 int ecryptfs_privileged_open(struct file **lower_file,
 697                              struct dentry *lower_dentry,
 698                              struct vfsmount *lower_mnt,
 699                              const struct cred *cred);
 700 int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode);
 701 void ecryptfs_put_lower_file(struct inode *inode);
 702 int
 703 ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
 704                              size_t *packet_size,
 705                              struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 706                              char *filename, size_t filename_size);
 707 int
 708 ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
 709                              size_t *packet_size,
 710                              struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 711                              char *data, size_t max_packet_size);
 712 int ecryptfs_set_f_namelen(long *namelen, long lower_namelen,
 713                            struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
 714 int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat,
 715                        loff_t offset);
 716
 717 extern const struct xattr_handler *ecryptfs_xattr_handlers[];
 718
 719 #endif /* #ifndef ECRYPTFS_KERNEL_H */