mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-01-15 17:43:59 +00:00
46f47e4800
Previously, each filesystem configured without encryption support would define all the public fscrypt functions to their notsupp_* stubs. This list of #defines had to be updated in every filesystem whenever a change was made to the public fscrypt functions. To make things more maintainable now that we have three filesystems using fscrypt, split the old header fscrypto.h into several new headers. fscrypt_supp.h contains the real declarations and is included by filesystems when configured with encryption support, whereas fscrypt_notsupp.h contains the inline stubs and is included by filesystems when configured without encryption support. fscrypt_common.h contains common declarations needed by both. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/*
|
|
* fscrypt_private.h
|
|
*
|
|
* Copyright (C) 2015, Google, Inc.
|
|
*
|
|
* This contains encryption key functions.
|
|
*
|
|
* Written by Michael Halcrow, Ildar Muslukhov, and Uday Savagaonkar, 2015.
|
|
*/
|
|
|
|
#ifndef _FSCRYPT_PRIVATE_H
|
|
#define _FSCRYPT_PRIVATE_H
|
|
|
|
#include <linux/fscrypt_supp.h>
|
|
|
|
#define FS_FNAME_CRYPTO_DIGEST_SIZE 32
|
|
|
|
/* Encryption parameters */
|
|
#define FS_XTS_TWEAK_SIZE 16
|
|
#define FS_AES_128_ECB_KEY_SIZE 16
|
|
#define FS_AES_256_GCM_KEY_SIZE 32
|
|
#define FS_AES_256_CBC_KEY_SIZE 32
|
|
#define FS_AES_256_CTS_KEY_SIZE 32
|
|
#define FS_AES_256_XTS_KEY_SIZE 64
|
|
#define FS_MAX_KEY_SIZE 64
|
|
|
|
#define FS_KEY_DESC_PREFIX "fscrypt:"
|
|
#define FS_KEY_DESC_PREFIX_SIZE 8
|
|
|
|
#define FS_KEY_DERIVATION_NONCE_SIZE 16
|
|
|
|
/**
|
|
* Encryption context for inode
|
|
*
|
|
* Protector format:
|
|
* 1 byte: Protector format (1 = this version)
|
|
* 1 byte: File contents encryption mode
|
|
* 1 byte: File names encryption mode
|
|
* 1 byte: Flags
|
|
* 8 bytes: Master Key descriptor
|
|
* 16 bytes: Encryption Key derivation nonce
|
|
*/
|
|
struct fscrypt_context {
|
|
u8 format;
|
|
u8 contents_encryption_mode;
|
|
u8 filenames_encryption_mode;
|
|
u8 flags;
|
|
u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE];
|
|
u8 nonce[FS_KEY_DERIVATION_NONCE_SIZE];
|
|
} __packed;
|
|
|
|
#define FS_ENCRYPTION_CONTEXT_FORMAT_V1 1
|
|
|
|
/* This is passed in from userspace into the kernel keyring */
|
|
struct fscrypt_key {
|
|
u32 mode;
|
|
u8 raw[FS_MAX_KEY_SIZE];
|
|
u32 size;
|
|
} __packed;
|
|
|
|
/*
|
|
* A pointer to this structure is stored in the file system's in-core
|
|
* representation of an inode.
|
|
*/
|
|
struct fscrypt_info {
|
|
u8 ci_data_mode;
|
|
u8 ci_filename_mode;
|
|
u8 ci_flags;
|
|
struct crypto_skcipher *ci_ctfm;
|
|
struct key *ci_keyring_key;
|
|
u8 ci_master_key[FS_KEY_DESCRIPTOR_SIZE];
|
|
};
|
|
|
|
typedef enum {
|
|
FS_DECRYPT = 0,
|
|
FS_ENCRYPT,
|
|
} fscrypt_direction_t;
|
|
|
|
#define FS_CTX_REQUIRES_FREE_ENCRYPT_FL 0x00000001
|
|
#define FS_CTX_HAS_BOUNCE_BUFFER_FL 0x00000002
|
|
|
|
struct fscrypt_completion_result {
|
|
struct completion completion;
|
|
int res;
|
|
};
|
|
|
|
#define DECLARE_FS_COMPLETION_RESULT(ecr) \
|
|
struct fscrypt_completion_result ecr = { \
|
|
COMPLETION_INITIALIZER((ecr).completion), 0 }
|
|
|
|
|
|
/* crypto.c */
|
|
extern int fscrypt_initialize(unsigned int cop_flags);
|
|
extern struct workqueue_struct *fscrypt_read_workqueue;
|
|
extern int fscrypt_do_page_crypto(const struct inode *inode,
|
|
fscrypt_direction_t rw, u64 lblk_num,
|
|
struct page *src_page,
|
|
struct page *dest_page,
|
|
unsigned int len, unsigned int offs,
|
|
gfp_t gfp_flags);
|
|
extern struct page *fscrypt_alloc_bounce_page(struct fscrypt_ctx *ctx,
|
|
gfp_t gfp_flags);
|
|
|
|
/* keyinfo.c */
|
|
extern int fscrypt_get_crypt_info(struct inode *);
|
|
|
|
#endif /* _FSCRYPT_PRIVATE_H */
|