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 <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 #include <linux/backing-dev.h>
  39
  40 /* Version verification for shared data structures w/ userspace */
  41 #define ECRYPTFS_VERSION_MAJOR 0x00
  42 #define ECRYPTFS_VERSION_MINOR 0x04
  43 #define ECRYPTFS_SUPPORTED_FILE_VERSION 0x03
  44 /* These flags indicate which features are supported by the kernel
  45  * module; userspace tools such as the mount helper read
  46  * ECRYPTFS_VERSIONING_MASK from a sysfs handle in order to determine
  47  * how to behave. */
  48 #define ECRYPTFS_VERSIONING_PASSPHRASE            0x00000001
  49 #define ECRYPTFS_VERSIONING_PUBKEY                0x00000002
  50 #define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004
  51 #define ECRYPTFS_VERSIONING_POLICY                0x00000008
  52 #define ECRYPTFS_VERSIONING_XATTR                 0x00000010
  53 #define ECRYPTFS_VERSIONING_MULTKEY               0x00000020
  54 #define ECRYPTFS_VERSIONING_DEVMISC               0x00000040
  55 #define ECRYPTFS_VERSIONING_HMAC                  0x00000080
  56 #define ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION   0x00000100
  57 #define ECRYPTFS_VERSIONING_GCM                   0x00000200
  58 #define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \
  59                                   | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \
  60                                   | ECRYPTFS_VERSIONING_PUBKEY \
  61                                   | ECRYPTFS_VERSIONING_XATTR \
  62                                   | ECRYPTFS_VERSIONING_MULTKEY \
  63                                   | ECRYPTFS_VERSIONING_DEVMISC \
  64                                   | ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION)
  65 #define ECRYPTFS_MAX_PASSWORD_LENGTH 64
  66 #define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH
  67 #define ECRYPTFS_SALT_SIZE 8
  68 #define ECRYPTFS_SALT_SIZE_HEX (ECRYPTFS_SALT_SIZE*2)
  69 /* The original signature size is only for what is stored on disk; all
  70  * in-memory representations are expanded hex, so it better adapted to
  71  * be passed around or referenced on the command line */
  72 #define ECRYPTFS_SIG_SIZE 8
  73 #define ECRYPTFS_SIG_SIZE_HEX (ECRYPTFS_SIG_SIZE*2)
  74 #define ECRYPTFS_PASSWORD_SIG_SIZE ECRYPTFS_SIG_SIZE_HEX
  75 #define ECRYPTFS_MAX_KEY_BYTES 64
  76 #define ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 512
  77 #define ECRYPTFS_DEFAULT_IV_BYTES 16
  78 #define ECRYPTFS_FILE_VERSION 0x03
  79 #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096
  80 #define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192
  81 #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32
  82 #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ
  83 #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3)
  84 #define ECRYPTFS_MAX_PKI_NAME_BYTES 16
  85 #define ECRYPTFS_DEFAULT_NUM_USERS 4
  86 #define ECRYPTFS_MAX_NUM_USERS 32768
  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_MAX_KEYSET_SIZE 1024
 196 #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32
 197 #define ECRYPTFS_MAX_NUM_ENC_KEYS 64
 198 #define ECRYPTFS_MAX_IV_BYTES 16        /* 128 bits */
 199 #define ECRYPTFS_SALT_BYTES 2
 200 #define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5
 201 #define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8      /* 4*2 */
 202 #define ECRYPTFS_FILE_SIZE_BYTES (sizeof(u64))
 203 #define ECRYPTFS_DEFAULT_CIPHER "aes"
 204 #define ECRYPTFS_DEFAULT_KEY_BYTES 16
 205 #define ECRYPTFS_DEFAULT_HASH "md5"
 206 #define ECRYPTFS_TAG_70_DIGEST ECRYPTFS_DEFAULT_HASH
 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 ECRYPTFS_TAG_70_PACKET_TYPE 0x46 /* FNEK-encrypted filename
 215                                           * as dentry name */
 216 #define ECRYPTFS_TAG_71_PACKET_TYPE 0x47 /* FNEK-encrypted filename in
 217                                           * metadata */
 218 #define ECRYPTFS_TAG_72_PACKET_TYPE 0x48 /* FEK-encrypted filename as
 219                                           * dentry name */
 220 #define ECRYPTFS_TAG_73_PACKET_TYPE 0x49 /* FEK-encrypted filename as
 221                                           * metadata */
 222 /* Constraint: ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES >=
 223  * ECRYPTFS_MAX_IV_BYTES */
 224 #define ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES 16
 225 #define ECRYPTFS_NON_NULL 0x42 /* A reasonable substitute for NULL */
 226 #define MD5_DIGEST_SIZE 16
 227 #define ECRYPTFS_TAG_70_DIGEST_SIZE MD5_DIGEST_SIZE
 228 #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FEK_ENCRYPTED."
 229 #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX_SIZE 23
 230 #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FNEK_ENCRYPTED."
 231 #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE 24
 232 #define ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN (18 + 1 + 4 + 1 + 32)
 233
 234 struct ecryptfs_key_sig {
 235         struct list_head crypt_stat_list;
 236         char keysig[ECRYPTFS_SIG_SIZE_HEX];
 237 };
 238
 239 struct ecryptfs_filename {
 240         struct list_head crypt_stat_list;
 241 #define ECRYPTFS_FILENAME_CONTAINS_DECRYPTED 0x00000001
 242         u32 flags;
 243         u32 seq_no;
 244         char *filename;
 245         char *encrypted_filename;
 246         size_t filename_size;
 247         size_t encrypted_filename_size;
 248         char fnek_sig[ECRYPTFS_SIG_SIZE_HEX];
 249         char dentry_name[ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN + 1];
 250 };
 251
 252 /**
 253  * This is the primary struct associated with each encrypted file.
 254  *
 255  * TODO: cache align/pack?
 256  */
 257 struct ecryptfs_crypt_stat {
 258 #define ECRYPTFS_STRUCT_INITIALIZED   0x00000001
 259 #define ECRYPTFS_POLICY_APPLIED       0x00000002
 260 #define ECRYPTFS_NEW_FILE             0x00000004
 261 #define ECRYPTFS_ENCRYPTED            0x00000008
 262 #define ECRYPTFS_SECURITY_WARNING     0x00000010
 263 #define ECRYPTFS_ENABLE_HMAC          0x00000020
 264 #define ECRYPTFS_ENCRYPT_IV_PAGES     0x00000040
 265 #define ECRYPTFS_KEY_VALID            0x00000080
 266 #define ECRYPTFS_METADATA_IN_XATTR    0x00000100
 267 #define ECRYPTFS_VIEW_AS_ENCRYPTED    0x00000200
 268 #define ECRYPTFS_KEY_SET              0x00000400
 269 #define ECRYPTFS_ENCRYPT_FILENAMES    0x00000800
 270 #define ECRYPTFS_ENCFN_USE_MOUNT_FNEK 0x00001000
 271 #define ECRYPTFS_ENCFN_USE_FEK        0x00002000
 272 #define ECRYPTFS_UNLINK_SIGS          0x00004000
 273         u32 flags;
 274         unsigned int file_version;
 275         size_t iv_bytes;
 276         size_t metadata_size;
 277         size_t extent_size; /* Data extent size; default is 4096 */
 278         size_t key_size;
 279         size_t extent_shift;
 280         unsigned int extent_mask;
 281         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 282         struct crypto_blkcipher *tfm;
 283         struct crypto_hash *hash_tfm; /* Crypto context for generating
 284                                        * the initialization vectors */
 285         unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE];
 286         unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
 287         unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
 288         struct list_head keysig_list;
 289         struct mutex keysig_list_mutex;
 290         struct mutex cs_tfm_mutex;
 291         struct mutex cs_hash_tfm_mutex;
 292         struct mutex cs_mutex;
 293 };
 294
 295 /* inode private data. */
 296 struct ecryptfs_inode_info {
 297         struct inode vfs_inode;
 298         struct inode *wii_inode;
 299         struct file *lower_file;
 300         struct mutex lower_file_mutex;
 301         struct ecryptfs_crypt_stat crypt_stat;
 302 };
 303
 304 /* dentry private data. Each dentry must keep track of a lower
 305  * vfsmount too. */
 306 struct ecryptfs_dentry_info {
 307         struct path lower_path;
 308         struct ecryptfs_crypt_stat *crypt_stat;
 309 };
 310
 311 /**
 312  * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint
 313  * @flags: Status flags
 314  * @mount_crypt_stat_list: These auth_toks hang off the mount-wide
 315  *                         cryptographic context. Every time a new
 316  *                         inode comes into existence, eCryptfs copies
 317  *                         the auth_toks on that list to the set of
 318  *                         auth_toks on the inode's crypt_stat
 319  * @global_auth_tok_key: The key from the user's keyring for the sig
 320  * @global_auth_tok: The key contents
 321  * @sig: The key identifier
 322  *
 323  * ecryptfs_global_auth_tok structs refer to authentication token keys
 324  * in the user keyring that apply to newly created files. A list of
 325  * these objects hangs off of the mount_crypt_stat struct for any
 326  * given eCryptfs mount. This struct maintains a reference to both the
 327  * key contents and the key itself so that the key can be put on
 328  * unmount.
 329  */
 330 struct ecryptfs_global_auth_tok {
 331 #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001
 332 #define ECRYPTFS_AUTH_TOK_FNEK    0x00000002
 333         u32 flags;
 334         struct list_head mount_crypt_stat_list;
 335         struct key *global_auth_tok_key;
 336         struct ecryptfs_auth_tok *global_auth_tok;
 337         unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1];
 338 };
 339
 340 /**
 341  * ecryptfs_key_tfm - Persistent key tfm
 342  * @key_tfm: crypto API handle to the key
 343  * @key_size: Key size in bytes
 344  * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is
 345  *                 using the persistent TFM at any point in time
 346  * @key_tfm_list: Handle to hang this off the module-wide TFM list
 347  * @cipher_name: String name for the cipher for this TFM
 348  *
 349  * Typically, eCryptfs will use the same ciphers repeatedly throughout
 350  * the course of its operations. In order to avoid unnecessarily
 351  * destroying and initializing the same cipher repeatedly, eCryptfs
 352  * keeps a list of crypto API contexts around to use when needed.
 353  */
 354 struct ecryptfs_key_tfm {
 355         struct crypto_blkcipher *key_tfm;
 356         size_t key_size;
 357         struct mutex key_tfm_mutex;
 358         struct list_head key_tfm_list;
 359         unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
 360 };
 361
 362 extern struct mutex key_tfm_list_mutex;
 363
 364 /**
 365  * This struct is to enable a mount-wide passphrase/salt combo. This
 366  * is more or less a stopgap to provide similar functionality to other
 367  * crypto filesystems like EncFS or CFS until full policy support is
 368  * implemented in eCryptfs.
 369  */
 370 struct ecryptfs_mount_crypt_stat {
 371         /* Pointers to memory we do not own, do not free these */
 372 #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001
 373 #define ECRYPTFS_XATTR_METADATA_ENABLED        0x00000002
 374 #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED        0x00000004
 375 #define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED  0x00000008
 376 #define ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES      0x00000010
 377 #define ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK   0x00000020
 378 #define ECRYPTFS_GLOBAL_ENCFN_USE_FEK          0x00000040
 379 #define ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY    0x00000080
 380         u32 flags;
 381         struct list_head global_auth_tok_list;
 382         struct mutex global_auth_tok_list_mutex;
 383         size_t num_global_auth_toks;
 384         size_t global_default_cipher_key_size;
 385         size_t global_default_fn_cipher_key_bytes;
 386         unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE
 387                                                  + 1];
 388         unsigned char global_default_fn_cipher_name[
 389                 ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
 390         char global_default_fnek_sig[ECRYPTFS_SIG_SIZE_HEX + 1];
 391 };
 392
 393 /* superblock private data. */
 394 struct ecryptfs_sb_info {
 395         struct super_block *wsi_sb;
 396         struct ecryptfs_mount_crypt_stat mount_crypt_stat;
 397         struct backing_dev_info bdi;
 398 };
 399
 400 /* file private data. */
 401 struct ecryptfs_file_info {
 402         struct file *wfi_file;
 403         struct ecryptfs_crypt_stat *crypt_stat;
 404 };
 405
 406 /* auth_tok <=> encrypted_session_key mappings */
 407 struct ecryptfs_auth_tok_list_item {
 408         unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES];
 409         struct list_head list;
 410         struct ecryptfs_auth_tok auth_tok;
 411 };
 412
 413 struct ecryptfs_message {
 414         /* Can never be greater than ecryptfs_message_buf_len */
 415         /* Used to find the parent msg_ctx */
 416         /* Inherits from msg_ctx->index */
 417         u32 index;
 418         u32 data_len;
 419         u8 data[];
 420 };
 421
 422 struct ecryptfs_msg_ctx {
 423 #define ECRYPTFS_MSG_CTX_STATE_FREE     0x01
 424 #define ECRYPTFS_MSG_CTX_STATE_PENDING  0x02
 425 #define ECRYPTFS_MSG_CTX_STATE_DONE     0x03
 426 #define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04
 427         u8 state;
 428 #define ECRYPTFS_MSG_HELO 100
 429 #define ECRYPTFS_MSG_QUIT 101
 430 #define ECRYPTFS_MSG_REQUEST 102
 431 #define ECRYPTFS_MSG_RESPONSE 103
 432         u8 type;
 433         u32 index;
 434         /* Counter converts to a sequence number. Each message sent
 435          * out for which we expect a response has an associated
 436          * sequence number. The response must have the same sequence
 437          * number as the counter for the msg_stc for the message to be
 438          * valid. */
 439         u32 counter;
 440         size_t msg_size;
 441         struct ecryptfs_message *msg;
 442         struct task_struct *task;
 443         struct list_head node;
 444         struct list_head daemon_out_list;
 445         struct mutex mux;
 446 };
 447
 448 struct ecryptfs_daemon;
 449
 450 struct ecryptfs_daemon {
 451 #define ECRYPTFS_DAEMON_IN_READ      0x00000001
 452 #define ECRYPTFS_DAEMON_IN_POLL      0x00000002
 453 #define ECRYPTFS_DAEMON_ZOMBIE       0x00000004
 454 #define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008
 455         u32 flags;
 456         u32 num_queued_msg_ctx;
 457         struct pid *pid;
 458         uid_t euid;
 459         struct user_namespace *user_ns;
 460         struct task_struct *task;
 461         struct mutex mux;
 462         struct list_head msg_ctx_out_queue;
 463         wait_queue_head_t wait;
 464         struct hlist_node euid_chain;
 465 };
 466
 467 extern struct mutex ecryptfs_daemon_hash_mux;
 468
 469 static inline size_t
 470 ecryptfs_lower_header_size(struct ecryptfs_crypt_stat *crypt_stat)
 471 {
 472         if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
 473                 return 0;
 474         return crypt_stat->metadata_size;
 475 }
 476
 477 static inline struct ecryptfs_file_info *
 478 ecryptfs_file_to_private(struct file *file)
 479 {
 480         return file->private_data;
 481 }
 482
 483 static inline void
 484 ecryptfs_set_file_private(struct file *file,
 485                           struct ecryptfs_file_info *file_info)
 486 {
 487         file->private_data = file_info;
 488 }
 489
 490 static inline struct file *ecryptfs_file_to_lower(struct file *file)
 491 {
 492         return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;
 493 }
 494
 495 static inline void
 496 ecryptfs_set_file_lower(struct file *file, struct file *lower_file)
 497 {
 498         ((struct ecryptfs_file_info *)file->private_data)->wfi_file =
 499                 lower_file;
 500 }
 501
 502 static inline struct ecryptfs_inode_info *
 503 ecryptfs_inode_to_private(struct inode *inode)
 504 {
 505         return container_of(inode, struct ecryptfs_inode_info, vfs_inode);
 506 }
 507
 508 static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode)
 509 {
 510         return ecryptfs_inode_to_private(inode)->wii_inode;
 511 }
 512
 513 static inline void
 514 ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode)
 515 {
 516         ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;
 517 }
 518
 519 static inline struct ecryptfs_sb_info *
 520 ecryptfs_superblock_to_private(struct super_block *sb)
 521 {
 522         return (struct ecryptfs_sb_info *)sb->s_fs_info;
 523 }
 524
 525 static inline void
 526 ecryptfs_set_superblock_private(struct super_block *sb,
 527                                 struct ecryptfs_sb_info *sb_info)
 528 {
 529         sb->s_fs_info = sb_info;
 530 }
 531
 532 static inline struct super_block *
 533 ecryptfs_superblock_to_lower(struct super_block *sb)
 534 {
 535         return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;
 536 }
 537
 538 static inline void
 539 ecryptfs_set_superblock_lower(struct super_block *sb,
 540                               struct super_block *lower_sb)
 541 {
 542         ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb;
 543 }
 544
 545 static inline struct ecryptfs_dentry_info *
 546 ecryptfs_dentry_to_private(struct dentry *dentry)
 547 {
 548         return (struct ecryptfs_dentry_info *)dentry->d_fsdata;
 549 }
 550
 551 static inline void
 552 ecryptfs_set_dentry_private(struct dentry *dentry,
 553                             struct ecryptfs_dentry_info *dentry_info)
 554 {
 555         dentry->d_fsdata = dentry_info;
 556 }
 557
 558 static inline struct dentry *
 559 ecryptfs_dentry_to_lower(struct dentry *dentry)
 560 {
 561         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
 562 }
 563
 564 static inline void
 565 ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry)
 566 {
 567         ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry =
 568                 lower_dentry;
 569 }
 570
 571 static inline struct vfsmount *
 572 ecryptfs_dentry_to_lower_mnt(struct dentry *dentry)
 573 {
 574         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;
 575 }
 576
 577 static inline void
 578 ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt)
 579 {
 580         ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt =
 581                 lower_mnt;
 582 }
 583
 584 #define ecryptfs_printk(type, fmt, arg...) \
 585         __ecryptfs_printk(type "%s: " fmt, __func__, ## arg);
 586 __attribute__ ((format(printf, 1, 2)))
 587 void __ecryptfs_printk(const char *fmt, ...);
 588
 589 extern const struct file_operations ecryptfs_main_fops;
 590 extern const struct file_operations ecryptfs_dir_fops;
 591 extern const struct inode_operations ecryptfs_main_iops;
 592 extern const struct inode_operations ecryptfs_dir_iops;
 593 extern const struct inode_operations ecryptfs_symlink_iops;
 594 extern const struct super_operations ecryptfs_sops;
 595 extern const struct dentry_operations ecryptfs_dops;
 596 extern const struct address_space_operations ecryptfs_aops;
 597 extern int ecryptfs_verbosity;
 598 extern unsigned int ecryptfs_message_buf_len;
 599 extern signed long ecryptfs_message_wait_timeout;
 600 extern unsigned int ecryptfs_number_of_users;
 601
 602 extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;
 603 extern struct kmem_cache *ecryptfs_file_info_cache;
 604 extern struct kmem_cache *ecryptfs_dentry_info_cache;
 605 extern struct kmem_cache *ecryptfs_inode_info_cache;
 606 extern struct kmem_cache *ecryptfs_sb_info_cache;
 607 extern struct kmem_cache *ecryptfs_header_cache_1;
 608 extern struct kmem_cache *ecryptfs_header_cache_2;
 609 extern struct kmem_cache *ecryptfs_xattr_cache;
 610 extern struct kmem_cache *ecryptfs_key_record_cache;
 611 extern struct kmem_cache *ecryptfs_key_sig_cache;
 612 extern struct kmem_cache *ecryptfs_global_auth_tok_cache;
 613 extern struct kmem_cache *ecryptfs_key_tfm_cache;
 614 extern struct kmem_cache *ecryptfs_open_req_cache;
 615
 616 struct ecryptfs_open_req {
 617 #define ECRYPTFS_REQ_PROCESSED 0x00000001
 618 #define ECRYPTFS_REQ_DROPPED   0x00000002
 619 #define ECRYPTFS_REQ_ZOMBIE    0x00000004
 620         u32 flags;
 621         struct file **lower_file;
 622         struct dentry *lower_dentry;
 623         struct vfsmount *lower_mnt;
 624         wait_queue_head_t wait;
 625         struct mutex mux;
 626         struct list_head kthread_ctl_list;
 627 };
 628
 629 #define ECRYPTFS_INTERPOSE_FLAG_D_ADD                 0x00000001
 630 int ecryptfs_interpose(struct dentry *hidden_dentry,
 631                        struct dentry *this_dentry, struct super_block *sb,
 632                        u32 flags);
 633 int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
 634                                         struct dentry *lower_dentry,
 635                                         struct inode *ecryptfs_dir_inode);
 636 int ecryptfs_decode_and_decrypt_filename(char **decrypted_name,
 637                                          size_t *decrypted_name_size,
 638                                          struct dentry *ecryptfs_dentry,
 639                                          const char *name, size_t name_size);
 640 int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
 641 int ecryptfs_encrypt_and_encode_filename(
 642         char **encoded_name,
 643         size_t *encoded_name_size,
 644         struct ecryptfs_crypt_stat *crypt_stat,
 645         struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 646         const char *name, size_t name_size);
 647 struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);
 648 void ecryptfs_dump_hex(char *data, int bytes);
 649 int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
 650                         int sg_size);
 651 int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);
 652 void ecryptfs_rotate_iv(unsigned char *iv);
 653 void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
 654 void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
 655 void ecryptfs_destroy_mount_crypt_stat(
 656         struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
 657 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
 658 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode);
 659 int ecryptfs_encrypt_page(struct page *page);
 660 int ecryptfs_decrypt_page(struct page *page);
 661 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry);
 662 int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry);
 663 int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry);
 664 void ecryptfs_write_crypt_stat_flags(char *page_virt,
 665                                      struct ecryptfs_crypt_stat *crypt_stat,
 666                                      size_t *written);
 667 int ecryptfs_read_and_validate_header_region(char *data,
 668                                              struct inode *ecryptfs_inode);
 669 int ecryptfs_read_and_validate_xattr_region(char *page_virt,
 670                                             struct dentry *ecryptfs_dentry);
 671 u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes);
 672 int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code);
 673 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
 674 int ecryptfs_generate_key_packet_set(char *dest_base,
 675                                      struct ecryptfs_crypt_stat *crypt_stat,
 676                                      struct dentry *ecryptfs_dentry,
 677                                      size_t *len, size_t max);
 678 int
 679 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
 680                           unsigned char *src, struct dentry *ecryptfs_dentry);
 681 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
 682 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode);
 683 int ecryptfs_inode_set(struct inode *inode, void *lower_inode);
 684 void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode);
 685 ssize_t
 686 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
 687                         void *value, size_t size);
 688 int
 689 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
 690                   size_t size, int flags);
 691 int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode);
 692 int ecryptfs_process_helo(uid_t euid, struct user_namespace *user_ns,
 693                           struct pid *pid);
 694 int ecryptfs_process_quit(uid_t euid, struct user_namespace *user_ns,
 695                           struct pid *pid);
 696 int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
 697                               struct user_namespace *user_ns, struct pid *pid,
 698                               u32 seq);
 699 int ecryptfs_send_message(char *data, int data_len,
 700                           struct ecryptfs_msg_ctx **msg_ctx);
 701 int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
 702                                struct ecryptfs_message **emsg);
 703 int ecryptfs_init_messaging(void);
 704 void ecryptfs_release_messaging(void);
 705
 706 void
 707 ecryptfs_write_header_metadata(char *virt,
 708                                struct ecryptfs_crypt_stat *crypt_stat,
 709                                size_t *written);
 710 int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig);
 711 int
 712 ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 713                            char *sig, u32 global_auth_tok_flags);
 714 int ecryptfs_get_global_auth_tok_for_sig(
 715         struct ecryptfs_global_auth_tok **global_auth_tok,
 716         struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig);
 717 int
 718 ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
 719                          size_t key_size);
 720 int ecryptfs_init_crypto(void);
 721 int ecryptfs_destroy_crypto(void);
 722 int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm);
 723 int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
 724                                                struct mutex **tfm_mutex,
 725                                                char *cipher_name);
 726 int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
 727                                       struct ecryptfs_auth_tok **auth_tok,
 728                                       char *sig);
 729 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
 730                          loff_t offset, size_t size);
 731 int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
 732                                       struct page *page_for_lower,
 733                                       size_t offset_in_page, size_t size);
 734 int ecryptfs_write(struct inode *inode, char *data, loff_t offset, size_t size);
 735 int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
 736                         struct inode *ecryptfs_inode);
 737 int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
 738                                      pgoff_t page_index,
 739                                      size_t offset_in_page, size_t size,
 740                                      struct inode *ecryptfs_inode);
 741 struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index);
 742 int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon);
 743 int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon, uid_t euid,
 744                                  struct user_namespace *user_ns);
 745 int ecryptfs_parse_packet_length(unsigned char *data, size_t *size,
 746                                  size_t *length_size);
 747 int ecryptfs_write_packet_length(char *dest, size_t size,
 748                                  size_t *packet_size_length);
 749 int ecryptfs_init_ecryptfs_miscdev(void);
 750 void ecryptfs_destroy_ecryptfs_miscdev(void);
 751 int ecryptfs_send_miscdev(char *data, size_t data_size,
 752                           struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
 753                           u16 msg_flags, struct ecryptfs_daemon *daemon);
 754 void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx);
 755 int
 756 ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, uid_t euid,
 757                       struct user_namespace *user_ns, struct pid *pid);
 758 int ecryptfs_init_kthread(void);
 759 void ecryptfs_destroy_kthread(void);
 760 int ecryptfs_privileged_open(struct file **lower_file,
 761                              struct dentry *lower_dentry,
 762                              struct vfsmount *lower_mnt,
 763                              const struct cred *cred);
 764 int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry);
 765 int
 766 ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
 767                              size_t *packet_size,
 768                              struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 769                              char *filename, size_t filename_size);
 770 int
 771 ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
 772                              size_t *packet_size,
 773                              struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 774                              char *data, size_t max_packet_size);
 775 int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat,
 776                        loff_t offset);
 777
 778 #endif /* #ifndef ECRYPTFS_KERNEL_H */