linux/include/linux/ecryptfs.h
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   1#ifndef _LINUX_ECRYPTFS_H
   2#define _LINUX_ECRYPTFS_H
   3
   4/* Version verification for shared data structures w/ userspace */
   5#define ECRYPTFS_VERSION_MAJOR 0x00
   6#define ECRYPTFS_VERSION_MINOR 0x04
   7#define ECRYPTFS_SUPPORTED_FILE_VERSION 0x03
   8/* These flags indicate which features are supported by the kernel
   9 * module; userspace tools such as the mount helper read the feature
  10 * bits from a sysfs handle in order to determine how to behave. */
  11#define ECRYPTFS_VERSIONING_PASSPHRASE            0x00000001
  12#define ECRYPTFS_VERSIONING_PUBKEY                0x00000002
  13#define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004
  14#define ECRYPTFS_VERSIONING_POLICY                0x00000008
  15#define ECRYPTFS_VERSIONING_XATTR                 0x00000010
  16#define ECRYPTFS_VERSIONING_MULTKEY               0x00000020
  17#define ECRYPTFS_VERSIONING_DEVMISC               0x00000040
  18#define ECRYPTFS_VERSIONING_HMAC                  0x00000080
  19#define ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION   0x00000100
  20#define ECRYPTFS_VERSIONING_GCM                   0x00000200
  21#define ECRYPTFS_MAX_PASSWORD_LENGTH 64
  22#define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH
  23#define ECRYPTFS_SALT_SIZE 8
  24#define ECRYPTFS_SALT_SIZE_HEX (ECRYPTFS_SALT_SIZE*2)
  25/* The original signature size is only for what is stored on disk; all
  26 * in-memory representations are expanded hex, so it better adapted to
  27 * be passed around or referenced on the command line */
  28#define ECRYPTFS_SIG_SIZE 8
  29#define ECRYPTFS_SIG_SIZE_HEX (ECRYPTFS_SIG_SIZE*2)
  30#define ECRYPTFS_PASSWORD_SIG_SIZE ECRYPTFS_SIG_SIZE_HEX
  31#define ECRYPTFS_MAX_KEY_BYTES 64
  32#define ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 512
  33#define ECRYPTFS_FILE_VERSION 0x03
  34#define ECRYPTFS_MAX_PKI_NAME_BYTES 16
  35
  36#define RFC2440_CIPHER_DES3_EDE 0x02
  37#define RFC2440_CIPHER_CAST_5 0x03
  38#define RFC2440_CIPHER_BLOWFISH 0x04
  39#define RFC2440_CIPHER_AES_128 0x07
  40#define RFC2440_CIPHER_AES_192 0x08
  41#define RFC2440_CIPHER_AES_256 0x09
  42#define RFC2440_CIPHER_TWOFISH 0x0a
  43#define RFC2440_CIPHER_CAST_6 0x0b
  44
  45#define RFC2440_CIPHER_RSA 0x01
  46
  47/**
  48 * For convenience, we may need to pass around the encrypted session
  49 * key between kernel and userspace because the authentication token
  50 * may not be extractable.  For example, the TPM may not release the
  51 * private key, instead requiring the encrypted data and returning the
  52 * decrypted data.
  53 */
  54struct ecryptfs_session_key {
  55#define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT 0x00000001
  56#define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT 0x00000002
  57#define ECRYPTFS_CONTAINS_DECRYPTED_KEY 0x00000004
  58#define ECRYPTFS_CONTAINS_ENCRYPTED_KEY 0x00000008
  59        u32 flags;
  60        u32 encrypted_key_size;
  61        u32 decrypted_key_size;
  62        u8 encrypted_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
  63        u8 decrypted_key[ECRYPTFS_MAX_KEY_BYTES];
  64};
  65
  66struct ecryptfs_password {
  67        u32 password_bytes;
  68        s32 hash_algo;
  69        u32 hash_iterations;
  70        u32 session_key_encryption_key_bytes;
  71#define ECRYPTFS_PERSISTENT_PASSWORD 0x01
  72#define ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET 0x02
  73        u32 flags;
  74        /* Iterated-hash concatenation of salt and passphrase */
  75        u8 session_key_encryption_key[ECRYPTFS_MAX_KEY_BYTES];
  76        u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
  77        /* Always in expanded hex */
  78        u8 salt[ECRYPTFS_SALT_SIZE];
  79};
  80
  81enum ecryptfs_token_types {ECRYPTFS_PASSWORD, ECRYPTFS_PRIVATE_KEY};
  82
  83struct ecryptfs_private_key {
  84        u32 key_size;
  85        u32 data_len;
  86        u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
  87        char pki_type[ECRYPTFS_MAX_PKI_NAME_BYTES + 1];
  88        u8 data[];
  89};
  90
  91/* May be a password or a private key */
  92struct ecryptfs_auth_tok {
  93        u16 version; /* 8-bit major and 8-bit minor */
  94        u16 token_type;
  95#define ECRYPTFS_ENCRYPT_ONLY 0x00000001
  96        u32 flags;
  97        struct ecryptfs_session_key session_key;
  98        u8 reserved[32];
  99        union {
 100                struct ecryptfs_password password;
 101                struct ecryptfs_private_key private_key;
 102        } token;
 103} __attribute__ ((packed));
 104
 105#endif /* _LINUX_ECRYPTFS_H */
 106
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