diff options
Diffstat (limited to 'fs/ecryptfs/ecryptfs_kernel.h')
| -rw-r--r-- | fs/ecryptfs/ecryptfs_kernel.h | 150 |
1 files changed, 40 insertions, 110 deletions
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h index 43c7c43b06f5..b36c5572b3f3 100644 --- a/fs/ecryptfs/ecryptfs_kernel.h +++ b/fs/ecryptfs/ecryptfs_kernel.h @@ -29,6 +29,7 @@ #define ECRYPTFS_KERNEL_H #include <keys/user-type.h> +#include <keys/encrypted-type.h> #include <linux/fs.h> #include <linux/fs_stack.h> #include <linux/namei.h> @@ -36,125 +37,18 @@ #include <linux/hash.h> #include <linux/nsproxy.h> #include <linux/backing-dev.h> +#include <linux/ecryptfs.h> -/* Version verification for shared data structures w/ userspace */ -#define ECRYPTFS_VERSION_MAJOR 0x00 -#define ECRYPTFS_VERSION_MINOR 0x04 -#define ECRYPTFS_SUPPORTED_FILE_VERSION 0x03 -/* These flags indicate which features are supported by the kernel - * module; userspace tools such as the mount helper read - * ECRYPTFS_VERSIONING_MASK from a sysfs handle in order to determine - * how to behave. */ -#define ECRYPTFS_VERSIONING_PASSPHRASE 0x00000001 -#define ECRYPTFS_VERSIONING_PUBKEY 0x00000002 -#define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004 -#define ECRYPTFS_VERSIONING_POLICY 0x00000008 -#define ECRYPTFS_VERSIONING_XATTR 0x00000010 -#define ECRYPTFS_VERSIONING_MULTKEY 0x00000020 -#define ECRYPTFS_VERSIONING_DEVMISC 0x00000040 -#define ECRYPTFS_VERSIONING_HMAC 0x00000080 -#define ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION 0x00000100 -#define ECRYPTFS_VERSIONING_GCM 0x00000200 -#define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \ - | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \ - | ECRYPTFS_VERSIONING_PUBKEY \ - | ECRYPTFS_VERSIONING_XATTR \ - | ECRYPTFS_VERSIONING_MULTKEY \ - | ECRYPTFS_VERSIONING_DEVMISC \ - | ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION) -#define ECRYPTFS_MAX_PASSWORD_LENGTH 64 -#define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH -#define ECRYPTFS_SALT_SIZE 8 -#define ECRYPTFS_SALT_SIZE_HEX (ECRYPTFS_SALT_SIZE*2) -/* The original signature size is only for what is stored on disk; all - * in-memory representations are expanded hex, so it better adapted to - * be passed around or referenced on the command line */ -#define ECRYPTFS_SIG_SIZE 8 -#define ECRYPTFS_SIG_SIZE_HEX (ECRYPTFS_SIG_SIZE*2) -#define ECRYPTFS_PASSWORD_SIG_SIZE ECRYPTFS_SIG_SIZE_HEX -#define ECRYPTFS_MAX_KEY_BYTES 64 -#define ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 512 #define ECRYPTFS_DEFAULT_IV_BYTES 16 -#define ECRYPTFS_FILE_VERSION 0x03 #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096 #define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192 #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32 #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3) -#define ECRYPTFS_MAX_PKI_NAME_BYTES 16 #define ECRYPTFS_DEFAULT_NUM_USERS 4 #define ECRYPTFS_MAX_NUM_USERS 32768 #define ECRYPTFS_XATTR_NAME "user.ecryptfs" -#define RFC2440_CIPHER_DES3_EDE 0x02 -#define RFC2440_CIPHER_CAST_5 0x03 -#define RFC2440_CIPHER_BLOWFISH 0x04 -#define RFC2440_CIPHER_AES_128 0x07 -#define RFC2440_CIPHER_AES_192 0x08 -#define RFC2440_CIPHER_AES_256 0x09 -#define RFC2440_CIPHER_TWOFISH 0x0a -#define RFC2440_CIPHER_CAST_6 0x0b - -#define RFC2440_CIPHER_RSA 0x01 - -/** - * For convenience, we may need to pass around the encrypted session - * key between kernel and userspace because the authentication token - * may not be extractable. For example, the TPM may not release the - * private key, instead requiring the encrypted data and returning the - * decrypted data. - */ -struct ecryptfs_session_key { -#define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT 0x00000001 -#define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT 0x00000002 -#define ECRYPTFS_CONTAINS_DECRYPTED_KEY 0x00000004 -#define ECRYPTFS_CONTAINS_ENCRYPTED_KEY 0x00000008 - u32 flags; - u32 encrypted_key_size; - u32 decrypted_key_size; - u8 encrypted_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES]; - u8 decrypted_key[ECRYPTFS_MAX_KEY_BYTES]; -}; - -struct ecryptfs_password { - u32 password_bytes; - s32 hash_algo; - u32 hash_iterations; - u32 session_key_encryption_key_bytes; -#define ECRYPTFS_PERSISTENT_PASSWORD 0x01 -#define ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET 0x02 - u32 flags; - /* Iterated-hash concatenation of salt and passphrase */ - u8 session_key_encryption_key[ECRYPTFS_MAX_KEY_BYTES]; - u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1]; - /* Always in expanded hex */ - u8 salt[ECRYPTFS_SALT_SIZE]; -}; - -enum ecryptfs_token_types {ECRYPTFS_PASSWORD, ECRYPTFS_PRIVATE_KEY}; - -struct ecryptfs_private_key { - u32 key_size; - u32 data_len; - u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1]; - char pki_type[ECRYPTFS_MAX_PKI_NAME_BYTES + 1]; - u8 data[]; -}; - -/* May be a password or a private key */ -struct ecryptfs_auth_tok { - u16 version; /* 8-bit major and 8-bit minor */ - u16 token_type; -#define ECRYPTFS_ENCRYPT_ONLY 0x00000001 - u32 flags; - struct ecryptfs_session_key session_key; - u8 reserved[32]; - union { - struct ecryptfs_password password; - struct ecryptfs_private_key private_key; - } token; -} __attribute__ ((packed)); - void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok); extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size); extern void ecryptfs_from_hex(char *dst, char *src, int dst_size); @@ -185,11 +79,47 @@ struct ecryptfs_page_crypt_context { } param; }; +#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE) +static inline struct ecryptfs_auth_tok * +ecryptfs_get_encrypted_key_payload_data(struct key *key) +{ + if (key->type == &key_type_encrypted) + return (struct ecryptfs_auth_tok *) + (&((struct encrypted_key_payload *)key->payload.data)->payload_data); + else + return NULL; +} + +static inline struct key *ecryptfs_get_encrypted_key(char *sig) +{ + return request_key(&key_type_encrypted, sig, NULL); +} + +#else +static inline struct ecryptfs_auth_tok * +ecryptfs_get_encrypted_key_payload_data(struct key *key) +{ + return NULL; +} + +static inline struct key *ecryptfs_get_encrypted_key(char *sig) +{ + return ERR_PTR(-ENOKEY); +} + +#endif /* CONFIG_ENCRYPTED_KEYS */ + static inline struct ecryptfs_auth_tok * ecryptfs_get_key_payload_data(struct key *key) { - return (struct ecryptfs_auth_tok *) - (((struct user_key_payload*)key->payload.data)->data); + struct ecryptfs_auth_tok *auth_tok; + + auth_tok = ecryptfs_get_encrypted_key_payload_data(key); + if (!auth_tok) + return (struct ecryptfs_auth_tok *) + (((struct user_key_payload *)key->payload.data)->data); + else + return auth_tok; } #define ECRYPTFS_MAX_KEYSET_SIZE 1024 |