fs/ecryptfs/ecryptfs_kernel.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /**
   3  * eCryptfs: Linux filesystem encryption layer
   4  * Kernel declarations.
   5  *
   6  * Copyright (C) 1997-2003 Erez Zadok
   7  * Copyright (C) 2001-2003 Stony Brook University
   8  * Copyright (C) 2004-2008 International Business Machines Corp.
   9  *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
  10  *              Trevor S. Highland <trevor.highland@gmail.com>
  11  *              Tyler Hicks <tyhicks@ou.edu>
  12  */
  13
  14 #ifndef ECRYPTFS_KERNEL_H
  15 #define ECRYPTFS_KERNEL_H
  16
  17 #include <crypto/skcipher.h>
  18 #include <keys/user-type.h>
  19 #include <keys/encrypted-type.h>
  20 #include <linux/kernel.h>
  21 #include <linux/fs.h>
  22 #include <linux/fs_stack.h>
  23 #include <linux/namei.h>
  24 #include <linux/scatterlist.h>
  25 #include <linux/hash.h>
  26 #include <linux/nsproxy.h>
  27 #include <linux/backing-dev.h>
  28 #include <linux/ecryptfs.h>
  29
  30 #define ECRYPTFS_DEFAULT_IV_BYTES 16
  31 #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096
  32 #define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192
  33 #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32
  34 #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ
  35 #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3)
  36 #define ECRYPTFS_DEFAULT_NUM_USERS 4
  37 #define ECRYPTFS_MAX_NUM_USERS 32768
  38 #define ECRYPTFS_XATTR_NAME "user.ecryptfs"
  39
  40 void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);
  41 static inline void
  42 ecryptfs_to_hex(char *dst, char *src, size_t src_size)
  43 {
  44         char *end = bin2hex(dst, src, src_size);
  45         *end = '\0';
  46 }
  47
  48 extern void ecryptfs_from_hex(char *dst, char *src, int dst_size);
  49
  50 struct ecryptfs_key_record {
  51         unsigned char type;
  52         size_t enc_key_size;
  53         unsigned char sig[ECRYPTFS_SIG_SIZE];
  54         unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
  55 };
  56
  57 struct ecryptfs_auth_tok_list {
  58         struct ecryptfs_auth_tok *auth_tok;
  59         struct list_head list;
  60 };
  61
  62 struct ecryptfs_crypt_stat;
  63 struct ecryptfs_mount_crypt_stat;
  64
  65 struct ecryptfs_page_crypt_context {
  66         struct page *page;
  67 #define ECRYPTFS_PREPARE_COMMIT_MODE 0
  68 #define ECRYPTFS_WRITEPAGE_MODE      1
  69         unsigned int mode;
  70         union {
  71                 struct file *lower_file;
  72                 struct writeback_control *wbc;
  73         } param;
  74 };
  75
  76 #if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
  77 static inline struct ecryptfs_auth_tok *
  78 ecryptfs_get_encrypted_key_payload_data(struct key *key)
  79 {
  80         struct encrypted_key_payload *payload;
  81
  82         if (key->type != &key_type_encrypted)
  83                 return NULL;
  84
  85         payload = key->payload.data[0];
  86         if (!payload)
  87                 return ERR_PTR(-EKEYREVOKED);
  88
  89         return (struct ecryptfs_auth_tok *)payload->payload_data;
  90 }
  91
  92 static inline struct key *ecryptfs_get_encrypted_key(char *sig)
  93 {
  94         return request_key(&key_type_encrypted, sig, NULL);
  95 }
  96
  97 #else
  98 static inline struct ecryptfs_auth_tok *
  99 ecryptfs_get_encrypted_key_payload_data(struct key *key)
 100 {
 101         return NULL;
 102 }
 103
 104 static inline struct key *ecryptfs_get_encrypted_key(char *sig)
 105 {
 106         return ERR_PTR(-ENOKEY);
 107 }
 108
 109 #endif /* CONFIG_ENCRYPTED_KEYS */
 110
 111 static inline struct ecryptfs_auth_tok *
 112 ecryptfs_get_key_payload_data(struct key *key)
 113 {
 114         struct ecryptfs_auth_tok *auth_tok;
 115         struct user_key_payload *ukp;
 116
 117         auth_tok = ecryptfs_get_encrypted_key_payload_data(key);
 118         if (auth_tok)
 119                 return auth_tok;
 120
 121         ukp = user_key_payload_locked(key);
 122         if (!ukp)
 123                 return ERR_PTR(-EKEYREVOKED);
 124
 125         return (struct ecryptfs_auth_tok *)ukp->data;
 126 }
 127
 128 #define ECRYPTFS_MAX_KEYSET_SIZE 1024
 129 #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 31
 130 #define ECRYPTFS_MAX_NUM_ENC_KEYS 64
 131 #define ECRYPTFS_MAX_IV_BYTES 16        /* 128 bits */
 132 #define ECRYPTFS_SALT_BYTES 2
 133 #define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5
 134 #define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8      /* 4*2 */
 135 #define ECRYPTFS_FILE_SIZE_BYTES (sizeof(u64))
 136 #define ECRYPTFS_SIZE_AND_MARKER_BYTES (ECRYPTFS_FILE_SIZE_BYTES \
 137                                         + MAGIC_ECRYPTFS_MARKER_SIZE_BYTES)
 138 #define ECRYPTFS_DEFAULT_CIPHER "aes"
 139 #define ECRYPTFS_DEFAULT_KEY_BYTES 16
 140 #define ECRYPTFS_DEFAULT_HASH "md5"
 141 #define ECRYPTFS_TAG_70_DIGEST ECRYPTFS_DEFAULT_HASH
 142 #define ECRYPTFS_TAG_1_PACKET_TYPE 0x01
 143 #define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C
 144 #define ECRYPTFS_TAG_11_PACKET_TYPE 0xED
 145 #define ECRYPTFS_TAG_64_PACKET_TYPE 0x40
 146 #define ECRYPTFS_TAG_65_PACKET_TYPE 0x41
 147 #define ECRYPTFS_TAG_66_PACKET_TYPE 0x42
 148 #define ECRYPTFS_TAG_67_PACKET_TYPE 0x43
 149 #define ECRYPTFS_TAG_70_PACKET_TYPE 0x46 /* FNEK-encrypted filename
 150                                           * as dentry name */
 151 #define ECRYPTFS_TAG_71_PACKET_TYPE 0x47 /* FNEK-encrypted filename in
 152                                           * metadata */
 153 #define ECRYPTFS_TAG_72_PACKET_TYPE 0x48 /* FEK-encrypted filename as
 154                                           * dentry name */
 155 #define ECRYPTFS_TAG_73_PACKET_TYPE 0x49 /* FEK-encrypted filename as
 156                                           * metadata */
 157 #define ECRYPTFS_MIN_PKT_LEN_SIZE 1 /* Min size to specify packet length */
 158 #define ECRYPTFS_MAX_PKT_LEN_SIZE 2 /* Pass at least this many bytes to
 159                                      * ecryptfs_parse_packet_length() and
 160                                      * ecryptfs_write_packet_length()
 161                                      */
 162 /* Constraint: ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES >=
 163  * ECRYPTFS_MAX_IV_BYTES */
 164 #define ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES 16
 165 #define ECRYPTFS_NON_NULL 0x42 /* A reasonable substitute for NULL */
 166 #define MD5_DIGEST_SIZE 16
 167 #define ECRYPTFS_TAG_70_DIGEST_SIZE MD5_DIGEST_SIZE
 168 #define ECRYPTFS_TAG_70_MIN_METADATA_SIZE (1 + ECRYPTFS_MIN_PKT_LEN_SIZE \
 169                                            + ECRYPTFS_SIG_SIZE + 1 + 1)
 170 #define ECRYPTFS_TAG_70_MAX_METADATA_SIZE (1 + ECRYPTFS_MAX_PKT_LEN_SIZE \
 171                                            + ECRYPTFS_SIG_SIZE + 1 + 1)
 172 #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FEK_ENCRYPTED."
 173 #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX_SIZE 23
 174 #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FNEK_ENCRYPTED."
 175 #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE 24
 176 #define ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN (18 + 1 + 4 + 1 + 32)
 177
 178 #ifdef CONFIG_ECRYPT_FS_MESSAGING
 179 # define ECRYPTFS_VERSIONING_MASK_MESSAGING (ECRYPTFS_VERSIONING_DEVMISC \
 180                                              | ECRYPTFS_VERSIONING_PUBKEY)
 181 #else
 182 # define ECRYPTFS_VERSIONING_MASK_MESSAGING 0
 183 #endif
 184
 185 #define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \
 186                                   | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \
 187                                   | ECRYPTFS_VERSIONING_XATTR \
 188                                   | ECRYPTFS_VERSIONING_MULTKEY \
 189                                   | ECRYPTFS_VERSIONING_MASK_MESSAGING \
 190                                   | ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION)
 191 struct ecryptfs_key_sig {
 192         struct list_head crypt_stat_list;
 193         char keysig[ECRYPTFS_SIG_SIZE_HEX + 1];
 194 };
 195
 196 struct ecryptfs_filename {
 197         struct list_head crypt_stat_list;
 198 #define ECRYPTFS_FILENAME_CONTAINS_DECRYPTED 0x00000001
 199         u32 flags;
 200         u32 seq_no;
 201         char *filename;
 202         char *encrypted_filename;
 203         size_t filename_size;
 204         size_t encrypted_filename_size;
 205         char fnek_sig[ECRYPTFS_SIG_SIZE_HEX];
 206         char dentry_name[ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN + 1];
 207 };
 208
 209 /**
 210  * This is the primary struct associated with each encrypted file.
 211  *
 212  * TODO: cache align/pack?
 213  */
 214 struct ecryptfs_crypt_stat {
 215 #define ECRYPTFS_STRUCT_INITIALIZED   0x00000001
 216 #define ECRYPTFS_POLICY_APPLIED       0x00000002
 217 #define ECRYPTFS_ENCRYPTED            0x00000004
 218 #define ECRYPTFS_SECURITY_WARNING     0x00000008
 219 #define ECRYPTFS_ENABLE_HMAC          0x00000010
 220 #define ECRYPTFS_ENCRYPT_IV_PAGES     0x00000020
 221 #define ECRYPTFS_KEY_VALID            0x00000040
 222 #define ECRYPTFS_METADATA_IN_XATTR    0x00000080
 223 #define ECRYPTFS_VIEW_AS_ENCRYPTED    0x00000100
 224 #define ECRYPTFS_KEY_SET              0x00000200
 225 #define ECRYPTFS_ENCRYPT_FILENAMES    0x00000400
 226 #define ECRYPTFS_ENCFN_USE_MOUNT_FNEK 0x00000800
 227 #define ECRYPTFS_ENCFN_USE_FEK        0x00001000
 228 #define ECRYPTFS_UNLINK_SIGS          0x00002000
 229 #define ECRYPTFS_I_SIZE_INITIALIZED   0x00004000
 230         u32 flags;
 231         unsigned int file_version;
 232         size_t iv_bytes;
 233         size_t metadata_size;
 234         size_t extent_size; /* Data extent size; default is 4096 */
 235         size_t key_size;
 236         size_t extent_shift;
 237         unsigned int extent_mask;
 238         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 239         struct crypto_skcipher *tfm;
 240         struct crypto_shash *hash_tfm; /* Crypto context for generating
 241                                         * the initialization vectors */
 242         unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
 243         unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
 244         unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
 245         struct list_head keysig_list;
 246         struct mutex keysig_list_mutex;
 247         struct mutex cs_tfm_mutex;
 248         struct mutex cs_mutex;
 249 };
 250
 251 /* inode private data. */
 252 struct ecryptfs_inode_info {
 253         struct inode vfs_inode;
 254         struct inode *wii_inode;
 255         struct mutex lower_file_mutex;
 256         atomic_t lower_file_count;
 257         struct file *lower_file;
 258         struct ecryptfs_crypt_stat crypt_stat;
 259 };
 260
 261 /* dentry private data. Each dentry must keep track of a lower
 262  * vfsmount too. */
 263 struct ecryptfs_dentry_info {
 264         struct path lower_path;
 265         union {
 266                 struct ecryptfs_crypt_stat *crypt_stat;
 267                 struct rcu_head rcu;
 268         };
 269 };
 270
 271 /**
 272  * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint
 273  * @flags: Status flags
 274  * @mount_crypt_stat_list: These auth_toks hang off the mount-wide
 275  *                         cryptographic context. Every time a new
 276  *                         inode comes into existence, eCryptfs copies
 277  *                         the auth_toks on that list to the set of
 278  *                         auth_toks on the inode's crypt_stat
 279  * @global_auth_tok_key: The key from the user's keyring for the sig
 280  * @global_auth_tok: The key contents
 281  * @sig: The key identifier
 282  *
 283  * ecryptfs_global_auth_tok structs refer to authentication token keys
 284  * in the user keyring that apply to newly created files. A list of
 285  * these objects hangs off of the mount_crypt_stat struct for any
 286  * given eCryptfs mount. This struct maintains a reference to both the
 287  * key contents and the key itself so that the key can be put on
 288  * unmount.
 289  */
 290 struct ecryptfs_global_auth_tok {
 291 #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001
 292 #define ECRYPTFS_AUTH_TOK_FNEK    0x00000002
 293         u32 flags;
 294         struct list_head mount_crypt_stat_list;
 295         struct key *global_auth_tok_key;
 296         unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1];
 297 };
 298
 299 /**
 300  * ecryptfs_key_tfm - Persistent key tfm
 301  * @key_tfm: crypto API handle to the key
 302  * @key_size: Key size in bytes
 303  * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is
 304  *                 using the persistent TFM at any point in time
 305  * @key_tfm_list: Handle to hang this off the module-wide TFM list
 306  * @cipher_name: String name for the cipher for this TFM
 307  *
 308  * Typically, eCryptfs will use the same ciphers repeatedly throughout
 309  * the course of its operations. In order to avoid unnecessarily
 310  * destroying and initializing the same cipher repeatedly, eCryptfs
 311  * keeps a list of crypto API contexts around to use when needed.
 312  */
 313 struct ecryptfs_key_tfm {
 314         struct crypto_skcipher *key_tfm;
 315         size_t key_size;
 316         struct mutex key_tfm_mutex;
 317         struct list_head key_tfm_list;
 318         unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
 319 };
 320
 321 extern struct mutex key_tfm_list_mutex;
 322
 323 /**
 324  * This struct is to enable a mount-wide passphrase/salt combo. This
 325  * is more or less a stopgap to provide similar functionality to other
 326  * crypto filesystems like EncFS or CFS until full policy support is
 327  * implemented in eCryptfs.
 328  */
 329 struct ecryptfs_mount_crypt_stat {
 330         /* Pointers to memory we do not own, do not free these */
 331 #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001
 332 #define ECRYPTFS_XATTR_METADATA_ENABLED        0x00000002
 333 #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED        0x00000004
 334 #define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED  0x00000008
 335 #define ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES      0x00000010
 336 #define ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK   0x00000020
 337 #define ECRYPTFS_GLOBAL_ENCFN_USE_FEK          0x00000040
 338 #define ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY    0x00000080
 339         u32 flags;
 340         struct list_head global_auth_tok_list;
 341         struct mutex global_auth_tok_list_mutex;
 342         size_t global_default_cipher_key_size;
 343         size_t global_default_fn_cipher_key_bytes;
 344         unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE
 345                                                  + 1];
 346         unsigned char global_default_fn_cipher_name[
 347                 ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
 348         char global_default_fnek_sig[ECRYPTFS_SIG_SIZE_HEX + 1];
 349 };
 350
 351 /* superblock private data. */
 352 struct ecryptfs_sb_info {
 353         struct super_block *wsi_sb;
 354         struct ecryptfs_mount_crypt_stat mount_crypt_stat;
 355 };
 356
 357 /* file private data. */
 358 struct ecryptfs_file_info {
 359         struct file *wfi_file;
 360         struct ecryptfs_crypt_stat *crypt_stat;
 361 };
 362
 363 /* auth_tok <=> encrypted_session_key mappings */
 364 struct ecryptfs_auth_tok_list_item {
 365         unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES];
 366         struct list_head list;
 367         struct ecryptfs_auth_tok auth_tok;
 368 };
 369
 370 struct ecryptfs_message {
 371         /* Can never be greater than ecryptfs_message_buf_len */
 372         /* Used to find the parent msg_ctx */
 373         /* Inherits from msg_ctx->index */
 374         u32 index;
 375         u32 data_len;
 376         u8 data[];
 377 };
 378
 379 struct ecryptfs_msg_ctx {
 380 #define ECRYPTFS_MSG_CTX_STATE_FREE     0x01
 381 #define ECRYPTFS_MSG_CTX_STATE_PENDING  0x02
 382 #define ECRYPTFS_MSG_CTX_STATE_DONE     0x03
 383 #define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04
 384         u8 state;
 385 #define ECRYPTFS_MSG_HELO 100
 386 #define ECRYPTFS_MSG_QUIT 101
 387 #define ECRYPTFS_MSG_REQUEST 102
 388 #define ECRYPTFS_MSG_RESPONSE 103
 389         u8 type;
 390         u32 index;
 391         /* Counter converts to a sequence number. Each message sent
 392          * out for which we expect a response has an associated
 393          * sequence number. The response must have the same sequence
 394          * number as the counter for the msg_stc for the message to be
 395          * valid. */
 396         u32 counter;
 397         size_t msg_size;
 398         struct ecryptfs_message *msg;
 399         struct task_struct *task;
 400         struct list_head node;
 401         struct list_head daemon_out_list;
 402         struct mutex mux;
 403 };
 404
 405 struct ecryptfs_daemon {
 406 #define ECRYPTFS_DAEMON_IN_READ      0x00000001
 407 #define ECRYPTFS_DAEMON_IN_POLL      0x00000002
 408 #define ECRYPTFS_DAEMON_ZOMBIE       0x00000004
 409 #define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008
 410         u32 flags;
 411         u32 num_queued_msg_ctx;
 412         struct file *file;
 413         struct mutex mux;
 414         struct list_head msg_ctx_out_queue;
 415         wait_queue_head_t wait;
 416         struct hlist_node euid_chain;
 417 };
 418
 419 #ifdef CONFIG_ECRYPT_FS_MESSAGING
 420 extern struct mutex ecryptfs_daemon_hash_mux;
 421 #endif
 422
 423 static inline size_t
 424 ecryptfs_lower_header_size(struct ecryptfs_crypt_stat *crypt_stat)
 425 {
 426         if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
 427                 return 0;
 428         return crypt_stat->metadata_size;
 429 }
 430
 431 static inline struct ecryptfs_file_info *
 432 ecryptfs_file_to_private(struct file *file)
 433 {
 434         return file->private_data;
 435 }
 436
 437 static inline void
 438 ecryptfs_set_file_private(struct file *file,
 439                           struct ecryptfs_file_info *file_info)
 440 {
 441         file->private_data = file_info;
 442 }
 443
 444 static inline struct file *ecryptfs_file_to_lower(struct file *file)
 445 {
 446         return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;
 447 }
 448
 449 static inline void
 450 ecryptfs_set_file_lower(struct file *file, struct file *lower_file)
 451 {
 452         ((struct ecryptfs_file_info *)file->private_data)->wfi_file =
 453                 lower_file;
 454 }
 455
 456 static inline struct ecryptfs_inode_info *
 457 ecryptfs_inode_to_private(struct inode *inode)
 458 {
 459         return container_of(inode, struct ecryptfs_inode_info, vfs_inode);
 460 }
 461
 462 static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode)
 463 {
 464         return ecryptfs_inode_to_private(inode)->wii_inode;
 465 }
 466
 467 static inline void
 468 ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode)
 469 {
 470         ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;
 471 }
 472
 473 static inline struct ecryptfs_sb_info *
 474 ecryptfs_superblock_to_private(struct super_block *sb)
 475 {
 476         return (struct ecryptfs_sb_info *)sb->s_fs_info;
 477 }
 478
 479 static inline void
 480 ecryptfs_set_superblock_private(struct super_block *sb,
 481                                 struct ecryptfs_sb_info *sb_info)
 482 {
 483         sb->s_fs_info = sb_info;
 484 }
 485
 486 static inline struct super_block *
 487 ecryptfs_superblock_to_lower(struct super_block *sb)
 488 {
 489         return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;
 490 }
 491
 492 static inline void
 493 ecryptfs_set_superblock_lower(struct super_block *sb,
 494                               struct super_block *lower_sb)
 495 {
 496         ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb;
 497 }
 498
 499 static inline struct ecryptfs_dentry_info *
 500 ecryptfs_dentry_to_private(struct dentry *dentry)
 501 {
 502         return (struct ecryptfs_dentry_info *)dentry->d_fsdata;
 503 }
 504
 505 static inline void
 506 ecryptfs_set_dentry_private(struct dentry *dentry,
 507                             struct ecryptfs_dentry_info *dentry_info)
 508 {
 509         dentry->d_fsdata = dentry_info;
 510 }
 511
 512 static inline struct dentry *
 513 ecryptfs_dentry_to_lower(struct dentry *dentry)
 514 {
 515         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
 516 }
 517
 518 static inline struct vfsmount *
 519 ecryptfs_dentry_to_lower_mnt(struct dentry *dentry)
 520 {
 521         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;
 522 }
 523
 524 static inline struct path *
 525 ecryptfs_dentry_to_lower_path(struct dentry *dentry)
 526 {
 527         return &((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path;
 528 }
 529
 530 #define ecryptfs_printk(type, fmt, arg...) \
 531         __ecryptfs_printk(type "%s: " fmt, __func__, ## arg);
 532 __printf(1, 2)
 533 void __ecryptfs_printk(const char *fmt, ...);
 534
 535 extern const struct file_operations ecryptfs_main_fops;
 536 extern const struct file_operations ecryptfs_dir_fops;
 537 extern const struct inode_operations ecryptfs_main_iops;
 538 extern const struct inode_operations ecryptfs_dir_iops;
 539 extern const struct inode_operations ecryptfs_symlink_iops;
 540 extern const struct super_operations ecryptfs_sops;
 541 extern const struct dentry_operations ecryptfs_dops;
 542 extern const struct address_space_operations ecryptfs_aops;
 543 extern int ecryptfs_verbosity;
 544 extern unsigned int ecryptfs_message_buf_len;
 545 extern signed long ecryptfs_message_wait_timeout;
 546 extern unsigned int ecryptfs_number_of_users;
 547
 548 extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;
 549 extern struct kmem_cache *ecryptfs_file_info_cache;
 550 extern struct kmem_cache *ecryptfs_dentry_info_cache;
 551 extern struct kmem_cache *ecryptfs_inode_info_cache;
 552 extern struct kmem_cache *ecryptfs_sb_info_cache;
 553 extern struct kmem_cache *ecryptfs_header_cache;
 554 extern struct kmem_cache *ecryptfs_xattr_cache;
 555 extern struct kmem_cache *ecryptfs_key_record_cache;
 556 extern struct kmem_cache *ecryptfs_key_sig_cache;
 557 extern struct kmem_cache *ecryptfs_global_auth_tok_cache;
 558 extern struct kmem_cache *ecryptfs_key_tfm_cache;
 559
 560 struct inode *ecryptfs_get_inode(struct inode *lower_inode,
 561                                  struct super_block *sb);
 562 void ecryptfs_i_size_init(const char *page_virt, struct inode *inode);
 563 int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
 564                              struct inode *ecryptfs_inode);
 565 int ecryptfs_decode_and_decrypt_filename(char **decrypted_name,
 566                                          size_t *decrypted_name_size,
 567                                          struct super_block *sb,
 568                                          const char *name, size_t name_size);
 569 int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
 570 int ecryptfs_encrypt_and_encode_filename(
 571         char **encoded_name,
 572         size_t *encoded_name_size,
 573         struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 574         const char *name, size_t name_size);
 575 struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);
 576 void ecryptfs_dump_hex(char *data, int bytes);
 577 int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
 578                         int sg_size);
 579 int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);
 580 void ecryptfs_rotate_iv(unsigned char *iv);
 581 int ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
 582 void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
 583 void ecryptfs_destroy_mount_crypt_stat(
 584         struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
 585 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
 586 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode);
 587 int ecryptfs_encrypt_page(struct page *page);
 588 int ecryptfs_decrypt_page(struct page *page);
 589 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry,
 590                             struct inode *ecryptfs_inode);
 591 int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry);
 592 int ecryptfs_new_file_context(struct inode *ecryptfs_inode);
 593 void ecryptfs_write_crypt_stat_flags(char *page_virt,
 594                                      struct ecryptfs_crypt_stat *crypt_stat,
 595                                      size_t *written);
 596 int ecryptfs_read_and_validate_header_region(struct inode *inode);
 597 int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry,
 598                                             struct inode *inode);
 599 u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes);
 600 int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code);
 601 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
 602 int ecryptfs_generate_key_packet_set(char *dest_base,
 603                                      struct ecryptfs_crypt_stat *crypt_stat,
 604                                      struct dentry *ecryptfs_dentry,
 605                                      size_t *len, size_t max);
 606 int
 607 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
 608                           unsigned char *src, struct dentry *ecryptfs_dentry);
 609 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
 610 ssize_t
 611 ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode,
 612                         const char *name, void *value, size_t size);
 613 int
 614 ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, const char *name,
 615                   const void *value, size_t size, int flags);
 616 int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode);
 617 #ifdef CONFIG_ECRYPT_FS_MESSAGING
 618 int ecryptfs_process_response(struct ecryptfs_daemon *daemon,
 619                               struct ecryptfs_message *msg, u32 seq);
 620 int ecryptfs_send_message(char *data, int data_len,
 621                           struct ecryptfs_msg_ctx **msg_ctx);
 622 int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
 623                                struct ecryptfs_message **emsg);
 624 int ecryptfs_init_messaging(void);
 625 void ecryptfs_release_messaging(void);
 626 #else
 627 static inline int ecryptfs_init_messaging(void)
 628 {
 629         return 0;
 630 }
 631 static inline void ecryptfs_release_messaging(void)
 632 { }
 633 static inline int ecryptfs_send_message(char *data, int data_len,
 634                                         struct ecryptfs_msg_ctx **msg_ctx)
 635 {
 636         return -ENOTCONN;
 637 }
 638 static inline int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
 639                                              struct ecryptfs_message **emsg)
 640 {
 641         return -ENOMSG;
 642 }
 643 #endif
 644
 645 void
 646 ecryptfs_write_header_metadata(char *virt,
 647                                struct ecryptfs_crypt_stat *crypt_stat,
 648                                size_t *written);
 649 int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig);
 650 int
 651 ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 652                            char *sig, u32 global_auth_tok_flags);
 653 int ecryptfs_get_global_auth_tok_for_sig(
 654         struct ecryptfs_global_auth_tok **global_auth_tok,
 655         struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig);
 656 int
 657 ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
 658                          size_t key_size);
 659 int ecryptfs_init_crypto(void);
 660 int ecryptfs_destroy_crypto(void);
 661 int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm);
 662 int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_skcipher **tfm,
 663                                                struct mutex **tfm_mutex,
 664                                                char *cipher_name);
 665 int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
 666                                       struct ecryptfs_auth_tok **auth_tok,
 667                                       char *sig);
 668 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
 669                          loff_t offset, size_t size);
 670 int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
 671                                       struct page *page_for_lower,
 672                                       size_t offset_in_page, size_t size);
 673 int ecryptfs_write(struct inode *inode, char *data, loff_t offset, size_t size);
 674 int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
 675                         struct inode *ecryptfs_inode);
 676 int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
 677                                      pgoff_t page_index,
 678                                      size_t offset_in_page, size_t size,
 679                                      struct inode *ecryptfs_inode);
 680 struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index);
 681 int ecryptfs_parse_packet_length(unsigned char *data, size_t *size,
 682                                  size_t *length_size);
 683 int ecryptfs_write_packet_length(char *dest, size_t size,
 684                                  size_t *packet_size_length);
 685 #ifdef CONFIG_ECRYPT_FS_MESSAGING
 686 int ecryptfs_init_ecryptfs_miscdev(void);
 687 void ecryptfs_destroy_ecryptfs_miscdev(void);
 688 int ecryptfs_send_miscdev(char *data, size_t data_size,
 689                           struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
 690                           u16 msg_flags, struct ecryptfs_daemon *daemon);
 691 void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx);
 692 int
 693 ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, struct file *file);
 694 int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon);
 695 int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon);
 696 #endif
 697 int ecryptfs_init_kthread(void);
 698 void ecryptfs_destroy_kthread(void);
 699 int ecryptfs_privileged_open(struct file **lower_file,
 700                              struct dentry *lower_dentry,
 701                              struct vfsmount *lower_mnt,
 702                              const struct cred *cred);
 703 int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode);
 704 void ecryptfs_put_lower_file(struct inode *inode);
 705 int
 706 ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
 707                              size_t *packet_size,
 708                              struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 709                              char *filename, size_t filename_size);
 710 int
 711 ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
 712                              size_t *packet_size,
 713                              struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 714                              char *data, size_t max_packet_size);
 715 int ecryptfs_set_f_namelen(long *namelen, long lower_namelen,
 716                            struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
 717 int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat,
 718                        loff_t offset);
 719
 720 extern const struct xattr_handler *ecryptfs_xattr_handlers[];
 721
 722 #endif /* #ifndef ECRYPTFS_KERNEL_H */