193 lines
6.4 KiB
C
193 lines
6.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* fscrypt user API
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*
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* These ioctls can be used on filesystems that support fscrypt. See the
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* "User API" section of Documentation/filesystems/fscrypt.rst.
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*/
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#ifndef _LINUX_FSCRYPT_H
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#define _LINUX_FSCRYPT_H
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#include <linux/ioctl.h>
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#include <linux/types.h>
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/* Encryption policy flags */
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#define FSCRYPT_POLICY_FLAGS_PAD_4 0x00
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#define FSCRYPT_POLICY_FLAGS_PAD_8 0x01
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#define FSCRYPT_POLICY_FLAGS_PAD_16 0x02
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#define FSCRYPT_POLICY_FLAGS_PAD_32 0x03
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#define FSCRYPT_POLICY_FLAGS_PAD_MASK 0x03
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#define FSCRYPT_POLICY_FLAG_DIRECT_KEY 0x04
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#define FSCRYPT_POLICY_FLAG_IV_INO_LBLK_64 0x08
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#define FSCRYPT_POLICY_FLAG_IV_INO_LBLK_32 0x10
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/* Encryption algorithms */
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#define FSCRYPT_MODE_AES_256_XTS 1
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#define FSCRYPT_MODE_AES_256_CTS 4
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#define FSCRYPT_MODE_AES_128_CBC 5
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#define FSCRYPT_MODE_AES_128_CTS 6
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#define FSCRYPT_MODE_ADIANTUM 9
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/* If adding a mode number > 9, update FSCRYPT_MODE_MAX in fscrypt_private.h */
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/*
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* Legacy policy version; ad-hoc KDF and no key verification.
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* For new encrypted directories, use fscrypt_policy_v2 instead.
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*
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* Careful: the .version field for this is actually 0, not 1.
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*/
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#define FSCRYPT_POLICY_V1 0
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#define FSCRYPT_KEY_DESCRIPTOR_SIZE 8
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struct fscrypt_policy_v1 {
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__u8 version;
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__u8 contents_encryption_mode;
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__u8 filenames_encryption_mode;
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__u8 flags;
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__u8 master_key_descriptor[FSCRYPT_KEY_DESCRIPTOR_SIZE];
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};
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/*
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* Process-subscribed "logon" key description prefix and payload format.
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* Deprecated; prefer FS_IOC_ADD_ENCRYPTION_KEY instead.
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*/
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#define FSCRYPT_KEY_DESC_PREFIX "fscrypt:"
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#define FSCRYPT_KEY_DESC_PREFIX_SIZE 8
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#define FSCRYPT_MAX_KEY_SIZE 64
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struct fscrypt_key {
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__u32 mode;
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__u8 raw[FSCRYPT_MAX_KEY_SIZE];
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__u32 size;
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};
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/*
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* New policy version with HKDF and key verification (recommended).
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*/
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#define FSCRYPT_POLICY_V2 2
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#define FSCRYPT_KEY_IDENTIFIER_SIZE 16
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struct fscrypt_policy_v2 {
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__u8 version;
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__u8 contents_encryption_mode;
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__u8 filenames_encryption_mode;
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__u8 flags;
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__u8 __reserved[4];
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__u8 master_key_identifier[FSCRYPT_KEY_IDENTIFIER_SIZE];
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};
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/* Struct passed to FS_IOC_GET_ENCRYPTION_POLICY_EX */
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struct fscrypt_get_policy_ex_arg {
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__u64 policy_size; /* input/output */
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union {
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__u8 version;
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struct fscrypt_policy_v1 v1;
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struct fscrypt_policy_v2 v2;
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} policy; /* output */
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};
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/*
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* v1 policy keys are specified by an arbitrary 8-byte key "descriptor",
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* matching fscrypt_policy_v1::master_key_descriptor.
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*/
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#define FSCRYPT_KEY_SPEC_TYPE_DESCRIPTOR 1
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/*
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* v2 policy keys are specified by a 16-byte key "identifier" which the kernel
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* calculates as a cryptographic hash of the key itself,
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* matching fscrypt_policy_v2::master_key_identifier.
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*/
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#define FSCRYPT_KEY_SPEC_TYPE_IDENTIFIER 2
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/*
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* Specifies a key, either for v1 or v2 policies. This doesn't contain the
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* actual key itself; this is just the "name" of the key.
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*/
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struct fscrypt_key_specifier {
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__u32 type; /* one of FSCRYPT_KEY_SPEC_TYPE_* */
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__u32 __reserved;
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union {
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__u8 __reserved[32]; /* reserve some extra space */
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__u8 descriptor[FSCRYPT_KEY_DESCRIPTOR_SIZE];
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__u8 identifier[FSCRYPT_KEY_IDENTIFIER_SIZE];
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} u;
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};
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/*
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* Payload of Linux keyring key of type "fscrypt-provisioning", referenced by
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* fscrypt_add_key_arg::key_id as an alternative to fscrypt_add_key_arg::raw.
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*/
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struct fscrypt_provisioning_key_payload {
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__u32 type;
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__u32 __reserved;
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__u8 raw[];
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};
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/* Struct passed to FS_IOC_ADD_ENCRYPTION_KEY */
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struct fscrypt_add_key_arg {
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struct fscrypt_key_specifier key_spec;
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__u32 raw_size;
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__u32 key_id;
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__u32 __reserved[8];
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__u8 raw[];
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};
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/* Struct passed to FS_IOC_REMOVE_ENCRYPTION_KEY */
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struct fscrypt_remove_key_arg {
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struct fscrypt_key_specifier key_spec;
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#define FSCRYPT_KEY_REMOVAL_STATUS_FLAG_FILES_BUSY 0x00000001
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#define FSCRYPT_KEY_REMOVAL_STATUS_FLAG_OTHER_USERS 0x00000002
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__u32 removal_status_flags; /* output */
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__u32 __reserved[5];
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};
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/* Struct passed to FS_IOC_GET_ENCRYPTION_KEY_STATUS */
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struct fscrypt_get_key_status_arg {
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/* input */
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struct fscrypt_key_specifier key_spec;
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__u32 __reserved[6];
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/* output */
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#define FSCRYPT_KEY_STATUS_ABSENT 1
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#define FSCRYPT_KEY_STATUS_PRESENT 2
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#define FSCRYPT_KEY_STATUS_INCOMPLETELY_REMOVED 3
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__u32 status;
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#define FSCRYPT_KEY_STATUS_FLAG_ADDED_BY_SELF 0x00000001
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__u32 status_flags;
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__u32 user_count;
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__u32 __out_reserved[13];
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};
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#define FS_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct fscrypt_policy_v1)
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#define FS_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16])
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#define FS_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct fscrypt_policy_v1)
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#define FS_IOC_GET_ENCRYPTION_POLICY_EX _IOWR('f', 22, __u8[9]) /* size + version */
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#define FS_IOC_ADD_ENCRYPTION_KEY _IOWR('f', 23, struct fscrypt_add_key_arg)
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#define FS_IOC_REMOVE_ENCRYPTION_KEY _IOWR('f', 24, struct fscrypt_remove_key_arg)
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#define FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS _IOWR('f', 25, struct fscrypt_remove_key_arg)
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#define FS_IOC_GET_ENCRYPTION_KEY_STATUS _IOWR('f', 26, struct fscrypt_get_key_status_arg)
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#define FS_IOC_GET_ENCRYPTION_NONCE _IOR('f', 27, __u8[16])
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/**********************************************************************/
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/* old names; don't add anything new here! */
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#define fscrypt_policy fscrypt_policy_v1
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#define FS_KEY_DESCRIPTOR_SIZE FSCRYPT_KEY_DESCRIPTOR_SIZE
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#define FS_POLICY_FLAGS_PAD_4 FSCRYPT_POLICY_FLAGS_PAD_4
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#define FS_POLICY_FLAGS_PAD_8 FSCRYPT_POLICY_FLAGS_PAD_8
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#define FS_POLICY_FLAGS_PAD_16 FSCRYPT_POLICY_FLAGS_PAD_16
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#define FS_POLICY_FLAGS_PAD_32 FSCRYPT_POLICY_FLAGS_PAD_32
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#define FS_POLICY_FLAGS_PAD_MASK FSCRYPT_POLICY_FLAGS_PAD_MASK
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#define FS_POLICY_FLAG_DIRECT_KEY FSCRYPT_POLICY_FLAG_DIRECT_KEY
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#define FS_POLICY_FLAGS_VALID 0x07 /* contains old flags only */
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#define FS_ENCRYPTION_MODE_INVALID 0 /* never used */
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#define FS_ENCRYPTION_MODE_AES_256_XTS FSCRYPT_MODE_AES_256_XTS
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#define FS_ENCRYPTION_MODE_AES_256_GCM 2 /* never used */
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#define FS_ENCRYPTION_MODE_AES_256_CBC 3 /* never used */
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#define FS_ENCRYPTION_MODE_AES_256_CTS FSCRYPT_MODE_AES_256_CTS
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#define FS_ENCRYPTION_MODE_AES_128_CBC FSCRYPT_MODE_AES_128_CBC
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#define FS_ENCRYPTION_MODE_AES_128_CTS FSCRYPT_MODE_AES_128_CTS
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#define FS_ENCRYPTION_MODE_SPECK128_256_XTS 7 /* removed */
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#define FS_ENCRYPTION_MODE_SPECK128_256_CTS 8 /* removed */
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#define FS_ENCRYPTION_MODE_ADIANTUM FSCRYPT_MODE_ADIANTUM
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#define FS_KEY_DESC_PREFIX FSCRYPT_KEY_DESC_PREFIX
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#define FS_KEY_DESC_PREFIX_SIZE FSCRYPT_KEY_DESC_PREFIX_SIZE
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#define FS_MAX_KEY_SIZE FSCRYPT_MAX_KEY_SIZE
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#endif /* _LINUX_FSCRYPT_H */
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