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
  39 /* Version verification for shared data structures w/ userspace */
  40 #define ECRYPTFS_VERSION_MAJOR 0x00
  41 #define ECRYPTFS_VERSION_MINOR 0x04
  42 #define ECRYPTFS_SUPPORTED_FILE_VERSION 0x03
  43 /* These flags indicate which features are supported by the kernel
  44  * module; userspace tools such as the mount helper read
  45  * ECRYPTFS_VERSIONING_MASK from a sysfs handle in order to determine
  46  * how to behave. */
  47 #define ECRYPTFS_VERSIONING_PASSPHRASE            0x00000001
  48 #define ECRYPTFS_VERSIONING_PUBKEY                0x00000002
  49 #define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004
  50 #define ECRYPTFS_VERSIONING_POLICY                0x00000008
  51 #define ECRYPTFS_VERSIONING_XATTR                 0x00000010
  52 #define ECRYPTFS_VERSIONING_MULTKEY               0x00000020
  53 #define ECRYPTFS_VERSIONING_DEVMISC               0x00000040
  54 #define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \
  55                                   | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \
  56                                   | ECRYPTFS_VERSIONING_PUBKEY \
  57                                   | ECRYPTFS_VERSIONING_XATTR \
  58                                   | ECRYPTFS_VERSIONING_MULTKEY \
  59                                   | ECRYPTFS_VERSIONING_DEVMISC)
  60 #define ECRYPTFS_MAX_PASSWORD_LENGTH 64
  61 #define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH
  62 #define ECRYPTFS_SALT_SIZE 8
  63 #define ECRYPTFS_SALT_SIZE_HEX (ECRYPTFS_SALT_SIZE*2)
  64 /* The original signature size is only for what is stored on disk; all
  65  * in-memory representations are expanded hex, so it better adapted to
  66  * be passed around or referenced on the command line */
  67 #define ECRYPTFS_SIG_SIZE 8
  68 #define ECRYPTFS_SIG_SIZE_HEX (ECRYPTFS_SIG_SIZE*2)
  69 #define ECRYPTFS_PASSWORD_SIG_SIZE ECRYPTFS_SIG_SIZE_HEX
  70 #define ECRYPTFS_MAX_KEY_BYTES 64
  71 #define ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 512
  72 #define ECRYPTFS_DEFAULT_IV_BYTES 16
  73 #define ECRYPTFS_FILE_VERSION 0x03
  74 #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096
  75 #define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192
  76 #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32
  77 #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ
  78 #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3)
  79 #define ECRYPTFS_MAX_PKI_NAME_BYTES 16
  80 #define ECRYPTFS_DEFAULT_NUM_USERS 4
  81 #define ECRYPTFS_MAX_NUM_USERS 32768
  82 #define ECRYPTFS_TRANSPORT_NETLINK 0
  83 #define ECRYPTFS_TRANSPORT_CONNECTOR 1
  84 #define ECRYPTFS_TRANSPORT_RELAYFS 2
  85 #define ECRYPTFS_TRANSPORT_MISCDEV 3
  86 #define ECRYPTFS_DEFAULT_TRANSPORT ECRYPTFS_TRANSPORT_MISCDEV
  87 #define ECRYPTFS_XATTR_NAME "user.ecryptfs"
  88
  89 #define RFC2440_CIPHER_DES3_EDE 0x02
  90 #define RFC2440_CIPHER_CAST_5 0x03
  91 #define RFC2440_CIPHER_BLOWFISH 0x04
  92 #define RFC2440_CIPHER_AES_128 0x07
  93 #define RFC2440_CIPHER_AES_192 0x08
  94 #define RFC2440_CIPHER_AES_256 0x09
  95 #define RFC2440_CIPHER_TWOFISH 0x0a
  96 #define RFC2440_CIPHER_CAST_6 0x0b
  97
  98 #define RFC2440_CIPHER_RSA 0x01
  99
 100 /**
 101  * For convenience, we may need to pass around the encrypted session
 102  * key between kernel and userspace because the authentication token
 103  * may not be extractable.  For example, the TPM may not release the
 104  * private key, instead requiring the encrypted data and returning the
 105  * decrypted data.
 106  */
 107 struct ecryptfs_session_key {
 108 #define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT 0x00000001
 109 #define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT 0x00000002
 110 #define ECRYPTFS_CONTAINS_DECRYPTED_KEY 0x00000004
 111 #define ECRYPTFS_CONTAINS_ENCRYPTED_KEY 0x00000008
 112         u32 flags;
 113         u32 encrypted_key_size;
 114         u32 decrypted_key_size;
 115         u8 encrypted_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
 116         u8 decrypted_key[ECRYPTFS_MAX_KEY_BYTES];
 117 };
 118
 119 struct ecryptfs_password {
 120         u32 password_bytes;
 121         s32 hash_algo;
 122         u32 hash_iterations;
 123         u32 session_key_encryption_key_bytes;
 124 #define ECRYPTFS_PERSISTENT_PASSWORD 0x01
 125 #define ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET 0x02
 126         u32 flags;
 127         /* Iterated-hash concatenation of salt and passphrase */
 128         u8 session_key_encryption_key[ECRYPTFS_MAX_KEY_BYTES];
 129         u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
 130         /* Always in expanded hex */
 131         u8 salt[ECRYPTFS_SALT_SIZE];
 132 };
 133
 134 enum ecryptfs_token_types {ECRYPTFS_PASSWORD, ECRYPTFS_PRIVATE_KEY};
 135
 136 struct ecryptfs_private_key {
 137         u32 key_size;
 138         u32 data_len;
 139         u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
 140         char pki_type[ECRYPTFS_MAX_PKI_NAME_BYTES + 1];
 141         u8 data[];
 142 };
 143
 144 /* May be a password or a private key */
 145 struct ecryptfs_auth_tok {
 146         u16 version; /* 8-bit major and 8-bit minor */
 147         u16 token_type;
 148 #define ECRYPTFS_ENCRYPT_ONLY 0x00000001
 149         u32 flags;
 150         struct ecryptfs_session_key session_key;
 151         u8 reserved[32];
 152         union {
 153                 struct ecryptfs_password password;
 154                 struct ecryptfs_private_key private_key;
 155         } token;
 156 } __attribute__ ((packed));
 157
 158 void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);
 159 extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size);
 160 extern void ecryptfs_from_hex(char *dst, char *src, int dst_size);
 161
 162 struct ecryptfs_key_record {
 163         unsigned char type;
 164         size_t enc_key_size;
 165         unsigned char sig[ECRYPTFS_SIG_SIZE];
 166         unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
 167 };
 168
 169 struct ecryptfs_auth_tok_list {
 170         struct ecryptfs_auth_tok *auth_tok;
 171         struct list_head list;
 172 };
 173
 174 struct ecryptfs_crypt_stat;
 175 struct ecryptfs_mount_crypt_stat;
 176
 177 struct ecryptfs_page_crypt_context {
 178         struct page *page;
 179 #define ECRYPTFS_PREPARE_COMMIT_MODE 0
 180 #define ECRYPTFS_WRITEPAGE_MODE      1
 181         unsigned int mode;
 182         union {
 183                 struct file *lower_file;
 184                 struct writeback_control *wbc;
 185         } param;
 186 };
 187
 188 static inline struct ecryptfs_auth_tok *
 189 ecryptfs_get_key_payload_data(struct key *key)
 190 {
 191         return (struct ecryptfs_auth_tok *)
 192                 (((struct user_key_payload*)key->payload.data)->data);
 193 }
 194
 195 #define ECRYPTFS_SUPER_MAGIC 0xf15f
 196 #define ECRYPTFS_MAX_KEYSET_SIZE 1024
 197 #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32
 198 #define ECRYPTFS_MAX_NUM_ENC_KEYS 64
 199 #define ECRYPTFS_MAX_IV_BYTES 16        /* 128 bits */
 200 #define ECRYPTFS_SALT_BYTES 2
 201 #define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5
 202 #define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8      /* 4*2 */
 203 #define ECRYPTFS_FILE_SIZE_BYTES (sizeof(u64))
 204 #define ECRYPTFS_DEFAULT_CIPHER "aes"
 205 #define ECRYPTFS_DEFAULT_KEY_BYTES 16
 206 #define ECRYPTFS_DEFAULT_HASH "md5"
 207 #define ECRYPTFS_TAG_1_PACKET_TYPE 0x01
 208 #define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C
 209 #define ECRYPTFS_TAG_11_PACKET_TYPE 0xED
 210 #define ECRYPTFS_TAG_64_PACKET_TYPE 0x40
 211 #define ECRYPTFS_TAG_65_PACKET_TYPE 0x41
 212 #define ECRYPTFS_TAG_66_PACKET_TYPE 0x42
 213 #define ECRYPTFS_TAG_67_PACKET_TYPE 0x43
 214 #define MD5_DIGEST_SIZE 16
 215
 216 struct ecryptfs_key_sig {
 217         struct list_head crypt_stat_list;
 218         char keysig[ECRYPTFS_SIG_SIZE_HEX];
 219 };
 220
 221 /**
 222  * This is the primary struct associated with each encrypted file.
 223  *
 224  * TODO: cache align/pack?
 225  */
 226 struct ecryptfs_crypt_stat {
 227 #define ECRYPTFS_STRUCT_INITIALIZED 0x00000001
 228 #define ECRYPTFS_POLICY_APPLIED     0x00000002
 229 #define ECRYPTFS_NEW_FILE           0x00000004
 230 #define ECRYPTFS_ENCRYPTED          0x00000008
 231 #define ECRYPTFS_SECURITY_WARNING   0x00000010
 232 #define ECRYPTFS_ENABLE_HMAC        0x00000020
 233 #define ECRYPTFS_ENCRYPT_IV_PAGES   0x00000040
 234 #define ECRYPTFS_KEY_VALID          0x00000080
 235 #define ECRYPTFS_METADATA_IN_XATTR  0x00000100
 236 #define ECRYPTFS_VIEW_AS_ENCRYPTED  0x00000200
 237 #define ECRYPTFS_KEY_SET            0x00000400
 238         u32 flags;
 239         unsigned int file_version;
 240         size_t iv_bytes;
 241         size_t num_header_bytes_at_front;
 242         size_t extent_size; /* Data extent size; default is 4096 */
 243         size_t key_size;
 244         size_t extent_shift;
 245         unsigned int extent_mask;
 246         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 247         struct crypto_blkcipher *tfm;
 248         struct crypto_hash *hash_tfm; /* Crypto context for generating
 249                                        * the initialization vectors */
 250         unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE];
 251         unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
 252         unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
 253         struct list_head keysig_list;
 254         struct mutex keysig_list_mutex;
 255         struct mutex cs_tfm_mutex;
 256         struct mutex cs_hash_tfm_mutex;
 257         struct mutex cs_mutex;
 258 };
 259
 260 /* inode private data. */
 261 struct ecryptfs_inode_info {
 262         struct inode vfs_inode;
 263         struct inode *wii_inode;
 264         struct file *lower_file;
 265         struct mutex lower_file_mutex;
 266         struct ecryptfs_crypt_stat crypt_stat;
 267 };
 268
 269 /* dentry private data. Each dentry must keep track of a lower
 270  * vfsmount too. */
 271 struct ecryptfs_dentry_info {
 272         struct path lower_path;
 273         struct ecryptfs_crypt_stat *crypt_stat;
 274 };
 275
 276 /**
 277  * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint
 278  * @flags: Status flags
 279  * @mount_crypt_stat_list: These auth_toks hang off the mount-wide
 280  *                         cryptographic context. Every time a new
 281  *                         inode comes into existence, eCryptfs copies
 282  *                         the auth_toks on that list to the set of
 283  *                         auth_toks on the inode's crypt_stat
 284  * @global_auth_tok_key: The key from the user's keyring for the sig
 285  * @global_auth_tok: The key contents
 286  * @sig: The key identifier
 287  *
 288  * ecryptfs_global_auth_tok structs refer to authentication token keys
 289  * in the user keyring that apply to newly created files. A list of
 290  * these objects hangs off of the mount_crypt_stat struct for any
 291  * given eCryptfs mount. This struct maintains a reference to both the
 292  * key contents and the key itself so that the key can be put on
 293  * unmount.
 294  */
 295 struct ecryptfs_global_auth_tok {
 296 #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001
 297         u32 flags;
 298         struct list_head mount_crypt_stat_list;
 299         struct key *global_auth_tok_key;
 300         struct ecryptfs_auth_tok *global_auth_tok;
 301         unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1];
 302 };
 303
 304 /**
 305  * ecryptfs_key_tfm - Persistent key tfm
 306  * @key_tfm: crypto API handle to the key
 307  * @key_size: Key size in bytes
 308  * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is
 309  *                 using the persistent TFM at any point in time
 310  * @key_tfm_list: Handle to hang this off the module-wide TFM list
 311  * @cipher_name: String name for the cipher for this TFM
 312  *
 313  * Typically, eCryptfs will use the same ciphers repeatedly throughout
 314  * the course of its operations. In order to avoid unnecessarily
 315  * destroying and initializing the same cipher repeatedly, eCryptfs
 316  * keeps a list of crypto API contexts around to use when needed.
 317  */
 318 struct ecryptfs_key_tfm {
 319         struct crypto_blkcipher *key_tfm;
 320         size_t key_size;
 321         struct mutex key_tfm_mutex;
 322         struct list_head key_tfm_list;
 323         unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
 324 };
 325
 326 extern struct mutex key_tfm_list_mutex;
 327
 328 /**
 329  * This struct is to enable a mount-wide passphrase/salt combo. This
 330  * is more or less a stopgap to provide similar functionality to other
 331  * crypto filesystems like EncFS or CFS until full policy support is
 332  * implemented in eCryptfs.
 333  */
 334 struct ecryptfs_mount_crypt_stat {
 335         /* Pointers to memory we do not own, do not free these */
 336 #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001
 337 #define ECRYPTFS_XATTR_METADATA_ENABLED        0x00000002
 338 #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED        0x00000004
 339 #define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED  0x00000008
 340         u32 flags;
 341         struct list_head global_auth_tok_list;
 342         struct mutex global_auth_tok_list_mutex;
 343         size_t num_global_auth_toks;
 344         size_t global_default_cipher_key_size;
 345         unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE
 346                                                  + 1];
 347 };
 348
 349 /* superblock private data. */
 350 struct ecryptfs_sb_info {
 351         struct super_block *wsi_sb;
 352         struct ecryptfs_mount_crypt_stat mount_crypt_stat;
 353 };
 354
 355 /* file private data. */
 356 struct ecryptfs_file_info {
 357         struct file *wfi_file;
 358         struct ecryptfs_crypt_stat *crypt_stat;
 359 };
 360
 361 /* auth_tok <=> encrypted_session_key mappings */
 362 struct ecryptfs_auth_tok_list_item {
 363         unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES];
 364         struct list_head list;
 365         struct ecryptfs_auth_tok auth_tok;
 366 };
 367
 368 struct ecryptfs_message {
 369         /* Can never be greater than ecryptfs_message_buf_len */
 370         /* Used to find the parent msg_ctx */
 371         /* Inherits from msg_ctx->index */
 372         u32 index;
 373         u32 data_len;
 374         u8 data[];
 375 };
 376
 377 struct ecryptfs_msg_ctx {
 378 #define ECRYPTFS_MSG_CTX_STATE_FREE     0x01
 379 #define ECRYPTFS_MSG_CTX_STATE_PENDING  0x02
 380 #define ECRYPTFS_MSG_CTX_STATE_DONE     0x03
 381 #define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04
 382         u8 state;
 383 #define ECRYPTFS_MSG_HELO 100
 384 #define ECRYPTFS_MSG_QUIT 101
 385 #define ECRYPTFS_MSG_REQUEST 102
 386 #define ECRYPTFS_MSG_RESPONSE 103
 387         u8 type;
 388         u32 index;
 389         /* Counter converts to a sequence number. Each message sent
 390          * out for which we expect a response has an associated
 391          * sequence number. The response must have the same sequence
 392          * number as the counter for the msg_stc for the message to be
 393          * valid. */
 394         u32 counter;
 395         size_t msg_size;
 396         struct ecryptfs_message *msg;
 397         struct task_struct *task;
 398         struct list_head node;
 399         struct list_head daemon_out_list;
 400         struct mutex mux;
 401 };
 402
 403 extern unsigned int ecryptfs_transport;
 404
 405 struct ecryptfs_daemon;
 406
 407 struct ecryptfs_daemon {
 408 #define ECRYPTFS_DAEMON_IN_READ      0x00000001
 409 #define ECRYPTFS_DAEMON_IN_POLL      0x00000002
 410 #define ECRYPTFS_DAEMON_ZOMBIE       0x00000004
 411 #define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008
 412         u32 flags;
 413         u32 num_queued_msg_ctx;
 414         struct pid *pid;
 415         uid_t euid;
 416         struct user_namespace *user_ns;
 417         struct task_struct *task;
 418         struct mutex mux;
 419         struct list_head msg_ctx_out_queue;
 420         wait_queue_head_t wait;
 421         struct hlist_node euid_chain;
 422 };
 423
 424 extern struct mutex ecryptfs_daemon_hash_mux;
 425
 426 static inline struct ecryptfs_file_info *
 427 ecryptfs_file_to_private(struct file *file)
 428 {
 429         return (struct ecryptfs_file_info *)file->private_data;
 430 }
 431
 432 static inline void
 433 ecryptfs_set_file_private(struct file *file,
 434                           struct ecryptfs_file_info *file_info)
 435 {
 436         file->private_data = file_info;
 437 }
 438
 439 static inline struct file *ecryptfs_file_to_lower(struct file *file)
 440 {
 441         return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;
 442 }
 443
 444 static inline void
 445 ecryptfs_set_file_lower(struct file *file, struct file *lower_file)
 446 {
 447         ((struct ecryptfs_file_info *)file->private_data)->wfi_file =
 448                 lower_file;
 449 }
 450
 451 static inline struct ecryptfs_inode_info *
 452 ecryptfs_inode_to_private(struct inode *inode)
 453 {
 454         return container_of(inode, struct ecryptfs_inode_info, vfs_inode);
 455 }
 456
 457 static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode)
 458 {
 459         return ecryptfs_inode_to_private(inode)->wii_inode;
 460 }
 461
 462 static inline void
 463 ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode)
 464 {
 465         ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;
 466 }
 467
 468 static inline struct ecryptfs_sb_info *
 469 ecryptfs_superblock_to_private(struct super_block *sb)
 470 {
 471         return (struct ecryptfs_sb_info *)sb->s_fs_info;
 472 }
 473
 474 static inline void
 475 ecryptfs_set_superblock_private(struct super_block *sb,
 476                                 struct ecryptfs_sb_info *sb_info)
 477 {
 478         sb->s_fs_info = sb_info;
 479 }
 480
 481 static inline struct super_block *
 482 ecryptfs_superblock_to_lower(struct super_block *sb)
 483 {
 484         return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;
 485 }
 486
 487 static inline void
 488 ecryptfs_set_superblock_lower(struct super_block *sb,
 489                               struct super_block *lower_sb)
 490 {
 491         ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb;
 492 }
 493
 494 static inline struct ecryptfs_dentry_info *
 495 ecryptfs_dentry_to_private(struct dentry *dentry)
 496 {
 497         return (struct ecryptfs_dentry_info *)dentry->d_fsdata;
 498 }
 499
 500 static inline void
 501 ecryptfs_set_dentry_private(struct dentry *dentry,
 502                             struct ecryptfs_dentry_info *dentry_info)
 503 {
 504         dentry->d_fsdata = dentry_info;
 505 }
 506
 507 static inline struct dentry *
 508 ecryptfs_dentry_to_lower(struct dentry *dentry)
 509 {
 510         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
 511 }
 512
 513 static inline void
 514 ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry)
 515 {
 516         ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry =
 517                 lower_dentry;
 518 }
 519
 520 static inline struct vfsmount *
 521 ecryptfs_dentry_to_lower_mnt(struct dentry *dentry)
 522 {
 523         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;
 524 }
 525
 526 static inline void
 527 ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt)
 528 {
 529         ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt =
 530                 lower_mnt;
 531 }
 532
 533 #define ecryptfs_printk(type, fmt, arg...) \
 534         __ecryptfs_printk(type "%s: " fmt, __func__, ## arg);
 535 void __ecryptfs_printk(const char *fmt, ...);
 536
 537 extern const struct file_operations ecryptfs_main_fops;
 538 extern const struct file_operations ecryptfs_dir_fops;
 539 extern const struct inode_operations ecryptfs_main_iops;
 540 extern const struct inode_operations ecryptfs_dir_iops;
 541 extern const struct inode_operations ecryptfs_symlink_iops;
 542 extern const struct super_operations ecryptfs_sops;
 543 extern struct dentry_operations ecryptfs_dops;
 544 extern struct address_space_operations ecryptfs_aops;
 545 extern int ecryptfs_verbosity;
 546 extern unsigned int ecryptfs_message_buf_len;
 547 extern signed long ecryptfs_message_wait_timeout;
 548 extern unsigned int ecryptfs_number_of_users;
 549
 550 extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;
 551 extern struct kmem_cache *ecryptfs_file_info_cache;
 552 extern struct kmem_cache *ecryptfs_dentry_info_cache;
 553 extern struct kmem_cache *ecryptfs_inode_info_cache;
 554 extern struct kmem_cache *ecryptfs_sb_info_cache;
 555 extern struct kmem_cache *ecryptfs_header_cache_1;
 556 extern struct kmem_cache *ecryptfs_header_cache_2;
 557 extern struct kmem_cache *ecryptfs_xattr_cache;
 558 extern struct kmem_cache *ecryptfs_key_record_cache;
 559 extern struct kmem_cache *ecryptfs_key_sig_cache;
 560 extern struct kmem_cache *ecryptfs_global_auth_tok_cache;
 561 extern struct kmem_cache *ecryptfs_key_tfm_cache;
 562 extern struct kmem_cache *ecryptfs_open_req_cache;
 563
 564 struct ecryptfs_open_req {
 565 #define ECRYPTFS_REQ_PROCESSED 0x00000001
 566 #define ECRYPTFS_REQ_DROPPED   0x00000002
 567 #define ECRYPTFS_REQ_ZOMBIE    0x00000004
 568         u32 flags;
 569         struct file **lower_file;
 570         struct dentry *lower_dentry;
 571         struct vfsmount *lower_mnt;
 572         wait_queue_head_t wait;
 573         struct mutex mux;
 574         struct list_head kthread_ctl_list;
 575 };
 576
 577 #define ECRYPTFS_INTERPOSE_FLAG_D_ADD                 0x00000001
 578 int ecryptfs_interpose(struct dentry *hidden_dentry,
 579                        struct dentry *this_dentry, struct super_block *sb,
 580                        u32 flags);
 581 int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
 582 int ecryptfs_decode_filename(struct ecryptfs_crypt_stat *crypt_stat,
 583                              const char *name, int length,
 584                              char **decrypted_name);
 585 int ecryptfs_encode_filename(struct ecryptfs_crypt_stat *crypt_stat,
 586                              const char *name, int length,
 587                              char **encoded_name);
 588 struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);
 589 void ecryptfs_dump_hex(char *data, int bytes);
 590 int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
 591                         int sg_size);
 592 int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);
 593 void ecryptfs_rotate_iv(unsigned char *iv);
 594 void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
 595 void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
 596 void ecryptfs_destroy_mount_crypt_stat(
 597         struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
 598 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
 599 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode);
 600 int ecryptfs_encrypt_page(struct page *page);
 601 int ecryptfs_decrypt_page(struct page *page);
 602 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry);
 603 int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry);
 604 int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry);
 605 int ecryptfs_read_and_validate_header_region(char *data,
 606                                              struct inode *ecryptfs_inode);
 607 int ecryptfs_read_and_validate_xattr_region(char *page_virt,
 608                                             struct dentry *ecryptfs_dentry);
 609 u8 ecryptfs_code_for_cipher_string(struct ecryptfs_crypt_stat *crypt_stat);
 610 int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code);
 611 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
 612 int ecryptfs_generate_key_packet_set(char *dest_base,
 613                                      struct ecryptfs_crypt_stat *crypt_stat,
 614                                      struct dentry *ecryptfs_dentry,
 615                                      size_t *len, size_t max);
 616 int
 617 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
 618                           unsigned char *src, struct dentry *ecryptfs_dentry);
 619 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
 620 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode);
 621 int ecryptfs_inode_set(struct inode *inode, void *lower_inode);
 622 void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode);
 623 ssize_t
 624 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
 625                         void *value, size_t size);
 626 int
 627 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
 628                   size_t size, int flags);
 629 int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode);
 630 int ecryptfs_process_helo(unsigned int transport, uid_t euid,
 631                           struct user_namespace *user_ns, struct pid *pid);
 632 int ecryptfs_process_quit(uid_t euid, struct user_namespace *user_ns,
 633                           struct pid *pid);
 634 int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
 635                               struct user_namespace *user_ns, struct pid *pid,
 636                               u32 seq);
 637 int ecryptfs_send_message(unsigned int transport, char *data, int data_len,
 638                           struct ecryptfs_msg_ctx **msg_ctx);
 639 int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
 640                                struct ecryptfs_message **emsg);
 641 int ecryptfs_init_messaging(unsigned int transport);
 642 void ecryptfs_release_messaging(unsigned int transport);
 643
 644 int ecryptfs_send_netlink(char *data, int data_len,
 645                           struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
 646                           u16 msg_flags, struct pid *daemon_pid);
 647 int ecryptfs_init_netlink(void);
 648 void ecryptfs_release_netlink(void);
 649
 650 int ecryptfs_send_connector(char *data, int data_len,
 651                             struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
 652                             u16 msg_flags, struct pid *daemon_pid);
 653 int ecryptfs_init_connector(void);
 654 void ecryptfs_release_connector(void);
 655 void
 656 ecryptfs_write_header_metadata(char *virt,
 657                                struct ecryptfs_crypt_stat *crypt_stat,
 658                                size_t *written);
 659 int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig);
 660 int
 661 ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 662                            char *sig);
 663 int ecryptfs_get_global_auth_tok_for_sig(
 664         struct ecryptfs_global_auth_tok **global_auth_tok,
 665         struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig);
 666 int
 667 ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
 668                          size_t key_size);
 669 int ecryptfs_init_crypto(void);
 670 int ecryptfs_destroy_crypto(void);
 671 int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm);
 672 int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
 673                                                struct mutex **tfm_mutex,
 674                                                char *cipher_name);
 675 int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
 676                                       struct ecryptfs_auth_tok **auth_tok,
 677                                       char *sig);
 678 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
 679                          loff_t offset, size_t size);
 680 int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
 681                                       struct page *page_for_lower,
 682                                       size_t offset_in_page, size_t size);
 683 int ecryptfs_write(struct file *ecryptfs_file, char *data, loff_t offset,
 684                    size_t size);
 685 int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
 686                         struct inode *ecryptfs_inode);
 687 int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
 688                                      pgoff_t page_index,
 689                                      size_t offset_in_page, size_t size,
 690                                      struct inode *ecryptfs_inode);
 691 struct page *ecryptfs_get_locked_page(struct file *file, loff_t index);
 692 int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon);
 693 int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon, uid_t euid,
 694                                  struct user_namespace *user_ns);
 695 int ecryptfs_parse_packet_length(unsigned char *data, size_t *size,
 696                                  size_t *length_size);
 697 int ecryptfs_write_packet_length(char *dest, size_t size,
 698                                  size_t *packet_size_length);
 699 int ecryptfs_init_ecryptfs_miscdev(void);
 700 void ecryptfs_destroy_ecryptfs_miscdev(void);
 701 int ecryptfs_send_miscdev(char *data, size_t data_size,
 702                           struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
 703                           u16 msg_flags, struct ecryptfs_daemon *daemon);
 704 void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx);
 705 int
 706 ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, uid_t euid,
 707                       struct user_namespace *user_ns, struct pid *pid);
 708 int ecryptfs_init_kthread(void);
 709 void ecryptfs_destroy_kthread(void);
 710 int ecryptfs_privileged_open(struct file **lower_file,
 711                              struct dentry *lower_dentry,
 712                              struct vfsmount *lower_mnt);
 713 int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry);
 714
 715 #endif /* #ifndef ECRYPTFS_KERNEL_H */