You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
104 lines
3.2 KiB
104 lines
3.2 KiB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
|
|
/*
|
|
* fs-verity user API
|
|
*
|
|
* These ioctls can be used on filesystems that support fs-verity. See the
|
|
* "User API" section of Documentation/filesystems/fsverity.rst.
|
|
*
|
|
* Copyright 2019 Google LLC
|
|
*/
|
|
#ifndef _UAPI_LINUX_FSVERITY_H
|
|
#define _UAPI_LINUX_FSVERITY_H
|
|
|
|
#include <linux/ioctl.h>
|
|
#include <linux/types.h>
|
|
|
|
#define FS_VERITY_HASH_ALG_SHA256 1
|
|
#define FS_VERITY_HASH_ALG_SHA512 2
|
|
|
|
struct fsverity_enable_arg {
|
|
__u32 version;
|
|
__u32 hash_algorithm;
|
|
__u32 block_size;
|
|
__u32 salt_size;
|
|
__u64 salt_ptr;
|
|
__u32 sig_size;
|
|
__u32 __reserved1;
|
|
__u64 sig_ptr;
|
|
__u64 __reserved2[11];
|
|
};
|
|
|
|
struct fsverity_digest {
|
|
__u16 digest_algorithm;
|
|
__u16 digest_size; /* input/output */
|
|
__u8 digest[];
|
|
};
|
|
|
|
/*
|
|
* Struct containing a file's Merkle tree properties. The fs-verity file digest
|
|
* is the hash of this struct. A userspace program needs this struct only if it
|
|
* needs to compute fs-verity file digests itself, e.g. in order to sign files.
|
|
* It isn't needed just to enable fs-verity on a file.
|
|
*
|
|
* Note: when computing the file digest, 'sig_size' and 'signature' must be left
|
|
* zero and empty, respectively. These fields are present only because some
|
|
* filesystems reuse this struct as part of their on-disk format.
|
|
*/
|
|
struct fsverity_descriptor {
|
|
__u8 version; /* must be 1 */
|
|
__u8 hash_algorithm; /* Merkle tree hash algorithm */
|
|
__u8 log_blocksize; /* log2 of size of data and tree blocks */
|
|
__u8 salt_size; /* size of salt in bytes; 0 if none */
|
|
#ifdef __KERNEL__
|
|
__le32 sig_size;
|
|
#else
|
|
__le32 __reserved_0x04; /* must be 0 */
|
|
#endif
|
|
__le64 data_size; /* size of file the Merkle tree is built over */
|
|
__u8 root_hash[64]; /* Merkle tree root hash */
|
|
__u8 salt[32]; /* salt prepended to each hashed block */
|
|
__u8 __reserved[144]; /* must be 0's */
|
|
#ifdef __KERNEL__
|
|
__u8 signature[];
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* Format in which fs-verity file digests are signed in built-in signatures.
|
|
* This is the same as 'struct fsverity_digest', except here some magic bytes
|
|
* are prepended to provide some context about what is being signed in case the
|
|
* same key is used for non-fsverity purposes, and here the fields have fixed
|
|
* endianness.
|
|
*
|
|
* This struct is specific to the built-in signature verification support, which
|
|
* is optional. fs-verity users may also verify signatures in userspace, in
|
|
* which case userspace is responsible for deciding on what bytes are signed.
|
|
* This struct may still be used, but it doesn't have to be. For example,
|
|
* userspace could instead use a string like "sha256:$digest_as_hex_string".
|
|
*/
|
|
struct fsverity_formatted_digest {
|
|
char magic[8]; /* must be "FSVerity" */
|
|
__le16 digest_algorithm;
|
|
__le16 digest_size;
|
|
__u8 digest[];
|
|
};
|
|
|
|
#define FS_VERITY_METADATA_TYPE_MERKLE_TREE 1
|
|
#define FS_VERITY_METADATA_TYPE_DESCRIPTOR 2
|
|
#define FS_VERITY_METADATA_TYPE_SIGNATURE 3
|
|
|
|
struct fsverity_read_metadata_arg {
|
|
__u64 metadata_type;
|
|
__u64 offset;
|
|
__u64 length;
|
|
__u64 buf_ptr;
|
|
__u64 __reserved;
|
|
};
|
|
|
|
#define FS_IOC_ENABLE_VERITY _IOW('f', 133, struct fsverity_enable_arg)
|
|
#define FS_IOC_MEASURE_VERITY _IOWR('f', 134, struct fsverity_digest)
|
|
#define FS_IOC_READ_VERITY_METADATA \
|
|
_IOWR('f', 135, struct fsverity_read_metadata_arg)
|
|
|
|
#endif /* _UAPI_LINUX_FSVERITY_H */
|