1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
5 * These ioctls can be used on filesystems that support fscrypt. See the
6 * "User API" section of Documentation/filesystems/fscrypt.rst.
8 #ifndef _UAPI_LINUX_FSCRYPT_H
9 #define _UAPI_LINUX_FSCRYPT_H
11 #include <linux/types.h>
13 /* Encryption policy flags */
14 #define FSCRYPT_POLICY_FLAGS_PAD_4 0x00
15 #define FSCRYPT_POLICY_FLAGS_PAD_8 0x01
16 #define FSCRYPT_POLICY_FLAGS_PAD_16 0x02
17 #define FSCRYPT_POLICY_FLAGS_PAD_32 0x03
18 #define FSCRYPT_POLICY_FLAGS_PAD_MASK 0x03
19 #define FSCRYPT_POLICY_FLAG_DIRECT_KEY 0x04
20 #define FSCRYPT_POLICY_FLAG_IV_INO_LBLK_64 0x08
21 #define FSCRYPT_POLICY_FLAGS_VALID 0x0F
23 /* Encryption algorithms */
24 #define FSCRYPT_MODE_AES_256_XTS 1
25 #define FSCRYPT_MODE_AES_256_CTS 4
26 #define FSCRYPT_MODE_AES_128_CBC 5
27 #define FSCRYPT_MODE_AES_128_CTS 6
28 #define FSCRYPT_MODE_ADIANTUM 9
29 #define __FSCRYPT_MODE_MAX 9
32 * Legacy policy version; ad-hoc KDF and no key verification.
33 * For new encrypted directories, use fscrypt_policy_v2 instead.
35 * Careful: the .version field for this is actually 0, not 1.
37 #define FSCRYPT_POLICY_V1 0
38 #define FSCRYPT_KEY_DESCRIPTOR_SIZE 8
39 struct fscrypt_policy_v1
{
41 __u8 contents_encryption_mode
;
42 __u8 filenames_encryption_mode
;
44 __u8 master_key_descriptor
[FSCRYPT_KEY_DESCRIPTOR_SIZE
];
46 #define fscrypt_policy fscrypt_policy_v1
49 * Process-subscribed "logon" key description prefix and payload format.
50 * Deprecated; prefer FS_IOC_ADD_ENCRYPTION_KEY instead.
52 #define FSCRYPT_KEY_DESC_PREFIX "fscrypt:"
53 #define FSCRYPT_KEY_DESC_PREFIX_SIZE 8
54 #define FSCRYPT_MAX_KEY_SIZE 64
57 __u8 raw
[FSCRYPT_MAX_KEY_SIZE
];
62 * New policy version with HKDF and key verification (recommended).
64 #define FSCRYPT_POLICY_V2 2
65 #define FSCRYPT_KEY_IDENTIFIER_SIZE 16
66 struct fscrypt_policy_v2
{
68 __u8 contents_encryption_mode
;
69 __u8 filenames_encryption_mode
;
72 __u8 master_key_identifier
[FSCRYPT_KEY_IDENTIFIER_SIZE
];
75 /* Struct passed to FS_IOC_GET_ENCRYPTION_POLICY_EX */
76 struct fscrypt_get_policy_ex_arg
{
77 __u64 policy_size
; /* input/output */
80 struct fscrypt_policy_v1 v1
;
81 struct fscrypt_policy_v2 v2
;
82 } policy
; /* output */
86 * v1 policy keys are specified by an arbitrary 8-byte key "descriptor",
87 * matching fscrypt_policy_v1::master_key_descriptor.
89 #define FSCRYPT_KEY_SPEC_TYPE_DESCRIPTOR 1
92 * v2 policy keys are specified by a 16-byte key "identifier" which the kernel
93 * calculates as a cryptographic hash of the key itself,
94 * matching fscrypt_policy_v2::master_key_identifier.
96 #define FSCRYPT_KEY_SPEC_TYPE_IDENTIFIER 2
99 * Specifies a key, either for v1 or v2 policies. This doesn't contain the
100 * actual key itself; this is just the "name" of the key.
102 struct fscrypt_key_specifier
{
103 __u32 type
; /* one of FSCRYPT_KEY_SPEC_TYPE_* */
106 __u8 __reserved
[32]; /* reserve some extra space */
107 __u8 descriptor
[FSCRYPT_KEY_DESCRIPTOR_SIZE
];
108 __u8 identifier
[FSCRYPT_KEY_IDENTIFIER_SIZE
];
112 /* Struct passed to FS_IOC_ADD_ENCRYPTION_KEY */
113 struct fscrypt_add_key_arg
{
114 struct fscrypt_key_specifier key_spec
;
120 /* Struct passed to FS_IOC_REMOVE_ENCRYPTION_KEY */
121 struct fscrypt_remove_key_arg
{
122 struct fscrypt_key_specifier key_spec
;
123 #define FSCRYPT_KEY_REMOVAL_STATUS_FLAG_FILES_BUSY 0x00000001
124 #define FSCRYPT_KEY_REMOVAL_STATUS_FLAG_OTHER_USERS 0x00000002
125 __u32 removal_status_flags
; /* output */
129 /* Struct passed to FS_IOC_GET_ENCRYPTION_KEY_STATUS */
130 struct fscrypt_get_key_status_arg
{
132 struct fscrypt_key_specifier key_spec
;
136 #define FSCRYPT_KEY_STATUS_ABSENT 1
137 #define FSCRYPT_KEY_STATUS_PRESENT 2
138 #define FSCRYPT_KEY_STATUS_INCOMPLETELY_REMOVED 3
140 #define FSCRYPT_KEY_STATUS_FLAG_ADDED_BY_SELF 0x00000001
143 __u32 __out_reserved
[13];
146 #define FS_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct fscrypt_policy)
147 #define FS_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16])
148 #define FS_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct fscrypt_policy)
149 #define FS_IOC_GET_ENCRYPTION_POLICY_EX _IOWR('f', 22, __u8[9]) /* size + version */
150 #define FS_IOC_ADD_ENCRYPTION_KEY _IOWR('f', 23, struct fscrypt_add_key_arg)
151 #define FS_IOC_REMOVE_ENCRYPTION_KEY _IOWR('f', 24, struct fscrypt_remove_key_arg)
152 #define FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS _IOWR('f', 25, struct fscrypt_remove_key_arg)
153 #define FS_IOC_GET_ENCRYPTION_KEY_STATUS _IOWR('f', 26, struct fscrypt_get_key_status_arg)
155 /**********************************************************************/
157 /* old names; don't add anything new here! */
159 #define FS_KEY_DESCRIPTOR_SIZE FSCRYPT_KEY_DESCRIPTOR_SIZE
160 #define FS_POLICY_FLAGS_PAD_4 FSCRYPT_POLICY_FLAGS_PAD_4
161 #define FS_POLICY_FLAGS_PAD_8 FSCRYPT_POLICY_FLAGS_PAD_8
162 #define FS_POLICY_FLAGS_PAD_16 FSCRYPT_POLICY_FLAGS_PAD_16
163 #define FS_POLICY_FLAGS_PAD_32 FSCRYPT_POLICY_FLAGS_PAD_32
164 #define FS_POLICY_FLAGS_PAD_MASK FSCRYPT_POLICY_FLAGS_PAD_MASK
165 #define FS_POLICY_FLAG_DIRECT_KEY FSCRYPT_POLICY_FLAG_DIRECT_KEY
166 #define FS_POLICY_FLAGS_VALID FSCRYPT_POLICY_FLAGS_VALID
167 #define FS_ENCRYPTION_MODE_INVALID 0 /* never used */
168 #define FS_ENCRYPTION_MODE_AES_256_XTS FSCRYPT_MODE_AES_256_XTS
169 #define FS_ENCRYPTION_MODE_AES_256_GCM 2 /* never used */
170 #define FS_ENCRYPTION_MODE_AES_256_CBC 3 /* never used */
171 #define FS_ENCRYPTION_MODE_AES_256_CTS FSCRYPT_MODE_AES_256_CTS
172 #define FS_ENCRYPTION_MODE_AES_128_CBC FSCRYPT_MODE_AES_128_CBC
173 #define FS_ENCRYPTION_MODE_AES_128_CTS FSCRYPT_MODE_AES_128_CTS
174 #define FS_ENCRYPTION_MODE_SPECK128_256_XTS 7 /* removed */
175 #define FS_ENCRYPTION_MODE_SPECK128_256_CTS 8 /* removed */
176 #define FS_ENCRYPTION_MODE_ADIANTUM FSCRYPT_MODE_ADIANTUM
177 #define FS_KEY_DESC_PREFIX FSCRYPT_KEY_DESC_PREFIX
178 #define FS_KEY_DESC_PREFIX_SIZE FSCRYPT_KEY_DESC_PREFIX_SIZE
179 #define FS_MAX_KEY_SIZE FSCRYPT_MAX_KEY_SIZE
180 #endif /* !__KERNEL__ */
182 #endif /* _UAPI_LINUX_FSCRYPT_H */