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fscrypt.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ /* * fscrypt user API * * These ioctls can be used on filesystems that support fscrypt. See the * "User API" section of Documentation/filesystems/fscrypt.rst. */ #ifndef _LINUX_FSCRYPT_H #define _LINUX_FSCRYPT_H #include <linux/ioctl.h> #include <linux/types.h> /* Encryption policy flags */ #define FSCRYPT_POLICY_FLAGS_PAD_4 0x00 #define FSCRYPT_POLICY_FLAGS_PAD_8 0x01 #define FSCRYPT_POLICY_FLAGS_PAD_16 0x02 #define FSCRYPT_POLICY_FLAGS_PAD_32 0x03 #define FSCRYPT_POLICY_FLAGS_PAD_MASK 0x03 #define FSCRYPT_POLICY_FLAG_DIRECT_KEY 0x04 #define FSCRYPT_POLICY_FLAG_IV_INO_LBLK_64 0x08 #define FSCRYPT_POLICY_FLAG_IV_INO_LBLK_32 0x10 /* Encryption algorithms */ #define FSCRYPT_MODE_AES_256_XTS 1 #define FSCRYPT_MODE_AES_256_CTS 4 #define FSCRYPT_MODE_AES_128_CBC 5 #define FSCRYPT_MODE_AES_128_CTS 6 #define FSCRYPT_MODE_SM4_XTS 7 #define FSCRYPT_MODE_SM4_CTS 8 #define FSCRYPT_MODE_ADIANTUM 9 #define FSCRYPT_MODE_AES_256_HCTR2 10 /* If adding a mode number > 10, update FSCRYPT_MODE_MAX in fscrypt_private.h */ /* * Legacy policy version; ad-hoc KDF and no key verification. * For new encrypted directories, use fscrypt_policy_v2 instead. * * Careful: the .version field for this is actually 0, not 1. */ #define FSCRYPT_POLICY_V1 0 #define FSCRYPT_KEY_DESCRIPTOR_SIZE 8 struct fscrypt_policy_v1 { __u8 version; __u8 contents_encryption_mode; __u8 filenames_encryption_mode; __u8 flags; __u8 master_key_descriptor[FSCRYPT_KEY_DESCRIPTOR_SIZE]; }; /* * Process-subscribed "logon" key description prefix and payload format. * Deprecated; prefer FS_IOC_ADD_ENCRYPTION_KEY instead. */ #define FSCRYPT_KEY_DESC_PREFIX "fscrypt:" #define FSCRYPT_KEY_DESC_PREFIX_SIZE 8 #define FSCRYPT_MAX_KEY_SIZE 64 struct fscrypt_key { __u32 mode; __u8 raw[FSCRYPT_MAX_KEY_SIZE]; __u32 size; }; /* * New policy version with HKDF and key verification (recommended). */ #define FSCRYPT_POLICY_V2 2 #define FSCRYPT_KEY_IDENTIFIER_SIZE 16 struct fscrypt_policy_v2 { __u8 version; __u8 contents_encryption_mode; __u8 filenames_encryption_mode; __u8 flags; __u8 __reserved[4]; __u8 master_key_identifier[FSCRYPT_KEY_IDENTIFIER_SIZE]; }; /* Struct passed to FS_IOC_GET_ENCRYPTION_POLICY_EX */ struct fscrypt_get_policy_ex_arg { __u64 policy_size; /* input/output */ union { __u8 version; struct fscrypt_policy_v1 v1; struct fscrypt_policy_v2 v2; } policy; /* output */ }; /* * v1 policy keys are specified by an arbitrary 8-byte key "descriptor", * matching fscrypt_policy_v1::master_key_descriptor. */ #define FSCRYPT_KEY_SPEC_TYPE_DESCRIPTOR 1 /* * v2 policy keys are specified by a 16-byte key "identifier" which the kernel * calculates as a cryptographic hash of the key itself, * matching fscrypt_policy_v2::master_key_identifier. */ #define FSCRYPT_KEY_SPEC_TYPE_IDENTIFIER 2 /* * Specifies a key, either for v1 or v2 policies. This doesn't contain the * actual key itself; this is just the "name" of the key. */ struct fscrypt_key_specifier { __u32 type; /* one of FSCRYPT_KEY_SPEC_TYPE_* */ __u32 __reserved; union { __u8 __reserved[32]; /* reserve some extra space */ __u8 descriptor[FSCRYPT_KEY_DESCRIPTOR_SIZE]; __u8 identifier[FSCRYPT_KEY_IDENTIFIER_SIZE]; } u; }; /* * Payload of Linux keyring key of type "fscrypt-provisioning", referenced by * fscrypt_add_key_arg::key_id as an alternative to fscrypt_add_key_arg::raw. */ struct fscrypt_provisioning_key_payload { __u32 type; __u32 __reserved; __u8 raw[]; }; /* Struct passed to FS_IOC_ADD_ENCRYPTION_KEY */ struct fscrypt_add_key_arg { struct fscrypt_key_specifier key_spec; __u32 raw_size; __u32 key_id; __u32 __reserved[8]; __u8 raw[]; }; /* Struct passed to FS_IOC_REMOVE_ENCRYPTION_KEY */ struct fscrypt_remove_key_arg { struct fscrypt_key_specifier key_spec; #define FSCRYPT_KEY_REMOVAL_STATUS_FLAG_FILES_BUSY 0x00000001 #define FSCRYPT_KEY_REMOVAL_STATUS_FLAG_OTHER_USERS 0x00000002 __u32 removal_status_flags; /* output */ __u32 __reserved[5]; }; /* Struct passed to FS_IOC_GET_ENCRYPTION_KEY_STATUS */ struct fscrypt_get_key_status_arg { /* input */ struct fscrypt_key_specifier key_spec; __u32 __reserved[6]; /* output */ #define FSCRYPT_KEY_STATUS_ABSENT 1 #define FSCRYPT_KEY_STATUS_PRESENT 2 #define FSCRYPT_KEY_STATUS_INCOMPLETELY_REMOVED 3 __u32 status; #define FSCRYPT_KEY_STATUS_FLAG_ADDED_BY_SELF 0x00000001 __u32 status_flags; __u32 user_count; __u32 __out_reserved[13]; }; #define FS_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct fscrypt_policy_v1) #define FS_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16]) #define FS_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct fscrypt_policy_v1) #define FS_IOC_GET_ENCRYPTION_POLICY_EX _IOWR('f', 22, __u8[9]) /* size + version */ #define FS_IOC_ADD_ENCRYPTION_KEY _IOWR('f', 23, struct fscrypt_add_key_arg) #define FS_IOC_REMOVE_ENCRYPTION_KEY _IOWR('f', 24, struct fscrypt_remove_key_arg) #define FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS _IOWR('f', 25, struct fscrypt_remove_key_arg) #define FS_IOC_GET_ENCRYPTION_KEY_STATUS _IOWR('f', 26, struct fscrypt_get_key_status_arg) #define FS_IOC_GET_ENCRYPTION_NONCE _IOR('f', 27, __u8[16]) /**********************************************************************/ /* old names; don't add anything new here! */ #define fscrypt_policy fscrypt_policy_v1 #define FS_KEY_DESCRIPTOR_SIZE FSCRYPT_KEY_DESCRIPTOR_SIZE #define FS_POLICY_FLAGS_PAD_4 FSCRYPT_POLICY_FLAGS_PAD_4 #define FS_POLICY_FLAGS_PAD_8 FSCRYPT_POLICY_FLAGS_PAD_8 #define FS_POLICY_FLAGS_PAD_16 FSCRYPT_POLICY_FLAGS_PAD_16 #define FS_POLICY_FLAGS_PAD_32 FSCRYPT_POLICY_FLAGS_PAD_32 #define FS_POLICY_FLAGS_PAD_MASK FSCRYPT_POLICY_FLAGS_PAD_MASK #define FS_POLICY_FLAG_DIRECT_KEY FSCRYPT_POLICY_FLAG_DIRECT_KEY #define FS_POLICY_FLAGS_VALID 0x07 /* contains old flags only */ #define FS_ENCRYPTION_MODE_INVALID 0 /* never used */ #define FS_ENCRYPTION_MODE_AES_256_XTS FSCRYPT_MODE_AES_256_XTS #define FS_ENCRYPTION_MODE_AES_256_GCM 2 /* never used */ #define FS_ENCRYPTION_MODE_AES_256_CBC 3 /* never used */ #define FS_ENCRYPTION_MODE_AES_256_CTS FSCRYPT_MODE_AES_256_CTS #define FS_ENCRYPTION_MODE_AES_128_CBC FSCRYPT_MODE_AES_128_CBC #define FS_ENCRYPTION_MODE_AES_128_CTS FSCRYPT_MODE_AES_128_CTS #define FS_ENCRYPTION_MODE_ADIANTUM FSCRYPT_MODE_ADIANTUM #define FS_KEY_DESC_PREFIX FSCRYPT_KEY_DESC_PREFIX #define FS_KEY_DESC_PREFIX_SIZE FSCRYPT_KEY_DESC_PREFIX_SIZE #define FS_MAX_KEY_SIZE FSCRYPT_MAX_KEY_SIZE #endif /* _LINUX_FSCRYPT_H */
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