cregit-Linux how code gets into the kernel

Release 4.7 include/linux/ecryptfs.h

Directory: include/linux
#ifndef _LINUX_ECRYPTFS_H

#define _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 the feature
 * bits 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_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_FILE_VERSION 0x03

#define ECRYPTFS_MAX_PKI_NAME_BYTES 16


#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));

#endif /* _LINUX_ECRYPTFS_H */

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Directory: include/linux
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