489 lines
17 KiB
C
489 lines
17 KiB
C
/**
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* eCryptfs: Linux filesystem encryption layer
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* Kernel declarations.
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*
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* Copyright (C) 1997-2003 Erez Zadok
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* Copyright (C) 2001-2003 Stony Brook University
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* Copyright (C) 2004-2006 International Business Machines Corp.
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* Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#ifndef ECRYPTFS_KERNEL_H
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#define ECRYPTFS_KERNEL_H
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#include <keys/user-type.h>
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#include <linux/fs.h>
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#include <linux/fs_stack.h>
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#include <linux/namei.h>
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#include <linux/scatterlist.h>
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/* Version verification for shared data structures w/ userspace */
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#define ECRYPTFS_VERSION_MAJOR 0x00
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#define ECRYPTFS_VERSION_MINOR 0x04
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#define ECRYPTFS_SUPPORTED_FILE_VERSION 0x01
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/* These flags indicate which features are supported by the kernel
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* module; userspace tools such as the mount helper read
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* ECRYPTFS_VERSIONING_MASK from a sysfs handle in order to determine
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* how to behave. */
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#define ECRYPTFS_VERSIONING_PASSPHRASE 0x00000001
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#define ECRYPTFS_VERSIONING_PUBKEY 0x00000002
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#define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004
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#define ECRYPTFS_VERSIONING_POLICY 0x00000008
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#define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \
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| ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH)
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#define ECRYPTFS_MAX_PASSWORD_LENGTH 64
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#define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH
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#define ECRYPTFS_SALT_SIZE 8
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#define ECRYPTFS_SALT_SIZE_HEX (ECRYPTFS_SALT_SIZE*2)
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/* The original signature size is only for what is stored on disk; all
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* in-memory representations are expanded hex, so it better adapted to
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* be passed around or referenced on the command line */
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#define ECRYPTFS_SIG_SIZE 8
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#define ECRYPTFS_SIG_SIZE_HEX (ECRYPTFS_SIG_SIZE*2)
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#define ECRYPTFS_PASSWORD_SIG_SIZE ECRYPTFS_SIG_SIZE_HEX
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#define ECRYPTFS_MAX_KEY_BYTES 64
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#define ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 512
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#define ECRYPTFS_DEFAULT_IV_BYTES 16
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#define ECRYPTFS_FILE_VERSION 0x01
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#define ECRYPTFS_DEFAULT_HEADER_EXTENT_SIZE 8192
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#define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096
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#define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192
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#define RFC2440_CIPHER_DES3_EDE 0x02
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#define RFC2440_CIPHER_CAST_5 0x03
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#define RFC2440_CIPHER_BLOWFISH 0x04
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#define RFC2440_CIPHER_AES_128 0x07
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#define RFC2440_CIPHER_AES_192 0x08
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#define RFC2440_CIPHER_AES_256 0x09
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#define RFC2440_CIPHER_TWOFISH 0x0a
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#define RFC2440_CIPHER_CAST_6 0x0b
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#define ECRYPTFS_SET_FLAG(flag_bit_vector, flag) (flag_bit_vector |= (flag))
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#define ECRYPTFS_CLEAR_FLAG(flag_bit_vector, flag) (flag_bit_vector &= ~(flag))
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#define ECRYPTFS_CHECK_FLAG(flag_bit_vector, flag) (flag_bit_vector & (flag))
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/**
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* For convenience, we may need to pass around the encrypted session
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* key between kernel and userspace because the authentication token
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* may not be extractable. For example, the TPM may not release the
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* private key, instead requiring the encrypted data and returning the
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* decrypted data.
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*/
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struct ecryptfs_session_key {
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#define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT 0x00000001
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#define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT 0x00000002
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#define ECRYPTFS_CONTAINS_DECRYPTED_KEY 0x00000004
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#define ECRYPTFS_CONTAINS_ENCRYPTED_KEY 0x00000008
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u32 flags;
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u32 encrypted_key_size;
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u32 decrypted_key_size;
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u8 encrypted_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
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u8 decrypted_key[ECRYPTFS_MAX_KEY_BYTES];
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};
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struct ecryptfs_password {
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u32 password_bytes;
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s32 hash_algo;
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u32 hash_iterations;
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u32 session_key_encryption_key_bytes;
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#define ECRYPTFS_PERSISTENT_PASSWORD 0x01
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#define ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET 0x02
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u32 flags;
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/* Iterated-hash concatenation of salt and passphrase */
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u8 session_key_encryption_key[ECRYPTFS_MAX_KEY_BYTES];
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u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
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/* Always in expanded hex */
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u8 salt[ECRYPTFS_SALT_SIZE];
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};
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enum ecryptfs_token_types {ECRYPTFS_PASSWORD, ECRYPTFS_PRIVATE_KEY};
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/* May be a password or a private key */
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struct ecryptfs_auth_tok {
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u16 version; /* 8-bit major and 8-bit minor */
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u16 token_type;
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u32 flags;
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struct ecryptfs_session_key session_key;
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u8 reserved[32];
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union {
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struct ecryptfs_password password;
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/* Private key is in future eCryptfs releases */
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} token;
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} __attribute__ ((packed));
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void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);
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extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size);
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extern void ecryptfs_from_hex(char *dst, char *src, int dst_size);
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struct ecryptfs_key_record {
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unsigned char type;
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size_t enc_key_size;
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unsigned char sig[ECRYPTFS_SIG_SIZE];
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unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
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};
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struct ecryptfs_auth_tok_list {
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struct ecryptfs_auth_tok *auth_tok;
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struct list_head list;
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};
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struct ecryptfs_crypt_stat;
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struct ecryptfs_mount_crypt_stat;
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struct ecryptfs_page_crypt_context {
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struct page *page;
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#define ECRYPTFS_PREPARE_COMMIT_MODE 0
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#define ECRYPTFS_WRITEPAGE_MODE 1
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unsigned int mode;
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union {
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struct file *lower_file;
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struct writeback_control *wbc;
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} param;
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};
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static inline struct ecryptfs_auth_tok *
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ecryptfs_get_key_payload_data(struct key *key)
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{
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return (struct ecryptfs_auth_tok *)
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(((struct user_key_payload*)key->payload.data)->data);
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}
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#define ECRYPTFS_SUPER_MAGIC 0xf15f
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#define ECRYPTFS_MAX_KEYSET_SIZE 1024
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#define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32
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#define ECRYPTFS_MAX_NUM_ENC_KEYS 64
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#define ECRYPTFS_MAX_NUM_KEYSIGS 2 /* TODO: Make this a linked list */
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#define ECRYPTFS_MAX_IV_BYTES 16 /* 128 bits */
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#define ECRYPTFS_SALT_BYTES 2
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#define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5
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#define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8 /* 4*2 */
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#define ECRYPTFS_FILE_SIZE_BYTES 8
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#define ECRYPTFS_DEFAULT_CIPHER "aes"
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#define ECRYPTFS_DEFAULT_KEY_BYTES 16
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#define ECRYPTFS_DEFAULT_CHAINING_MODE CRYPTO_TFM_MODE_CBC
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#define ECRYPTFS_DEFAULT_HASH "md5"
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#define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C
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#define ECRYPTFS_TAG_11_PACKET_TYPE 0xED
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#define MD5_DIGEST_SIZE 16
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/**
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* This is the primary struct associated with each encrypted file.
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*
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* TODO: cache align/pack?
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*/
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struct ecryptfs_crypt_stat {
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#define ECRYPTFS_STRUCT_INITIALIZED 0x00000001
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#define ECRYPTFS_POLICY_APPLIED 0x00000002
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#define ECRYPTFS_NEW_FILE 0x00000004
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#define ECRYPTFS_ENCRYPTED 0x00000008
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#define ECRYPTFS_SECURITY_WARNING 0x00000010
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#define ECRYPTFS_ENABLE_HMAC 0x00000020
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#define ECRYPTFS_ENCRYPT_IV_PAGES 0x00000040
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#define ECRYPTFS_KEY_VALID 0x00000080
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u32 flags;
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unsigned int file_version;
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size_t iv_bytes;
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size_t num_keysigs;
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size_t header_extent_size;
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size_t num_header_extents_at_front;
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size_t extent_size; /* Data extent size; default is 4096 */
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size_t key_size;
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size_t extent_shift;
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unsigned int extent_mask;
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struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
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struct crypto_blkcipher *tfm;
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struct crypto_hash *hash_tfm; /* Crypto context for generating
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* the initialization vectors */
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unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE];
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unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
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unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
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unsigned char keysigs[ECRYPTFS_MAX_NUM_KEYSIGS][ECRYPTFS_SIG_SIZE_HEX];
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struct mutex cs_tfm_mutex;
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struct mutex cs_hash_tfm_mutex;
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struct mutex cs_mutex;
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};
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/* inode private data. */
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struct ecryptfs_inode_info {
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struct inode vfs_inode;
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struct inode *wii_inode;
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struct ecryptfs_crypt_stat crypt_stat;
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};
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/* dentry private data. Each dentry must keep track of a lower
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* vfsmount too. */
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struct ecryptfs_dentry_info {
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struct path lower_path;
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struct ecryptfs_crypt_stat *crypt_stat;
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};
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/**
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* This struct is to enable a mount-wide passphrase/salt combo. This
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* is more or less a stopgap to provide similar functionality to other
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* crypto filesystems like EncFS or CFS until full policy support is
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* implemented in eCryptfs.
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*/
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struct ecryptfs_mount_crypt_stat {
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/* Pointers to memory we do not own, do not free these */
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#define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001
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u32 flags;
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struct ecryptfs_auth_tok *global_auth_tok;
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struct key *global_auth_tok_key;
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size_t global_default_cipher_key_size;
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struct crypto_blkcipher *global_key_tfm;
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struct mutex global_key_tfm_mutex;
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unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE
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+ 1];
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unsigned char global_auth_tok_sig[ECRYPTFS_SIG_SIZE_HEX + 1];
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};
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/* superblock private data. */
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struct ecryptfs_sb_info {
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struct super_block *wsi_sb;
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struct ecryptfs_mount_crypt_stat mount_crypt_stat;
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};
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/* file private data. */
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struct ecryptfs_file_info {
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struct file *wfi_file;
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struct ecryptfs_crypt_stat *crypt_stat;
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};
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/* auth_tok <=> encrypted_session_key mappings */
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struct ecryptfs_auth_tok_list_item {
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unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES];
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struct list_head list;
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struct ecryptfs_auth_tok auth_tok;
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};
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static inline struct ecryptfs_file_info *
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ecryptfs_file_to_private(struct file *file)
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{
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return (struct ecryptfs_file_info *)file->private_data;
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}
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static inline void
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ecryptfs_set_file_private(struct file *file,
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struct ecryptfs_file_info *file_info)
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{
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file->private_data = file_info;
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}
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static inline struct file *ecryptfs_file_to_lower(struct file *file)
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{
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return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;
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}
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static inline void
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ecryptfs_set_file_lower(struct file *file, struct file *lower_file)
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{
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((struct ecryptfs_file_info *)file->private_data)->wfi_file =
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lower_file;
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}
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static inline struct ecryptfs_inode_info *
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ecryptfs_inode_to_private(struct inode *inode)
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{
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return container_of(inode, struct ecryptfs_inode_info, vfs_inode);
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}
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static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode)
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{
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return ecryptfs_inode_to_private(inode)->wii_inode;
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}
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static inline void
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ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode)
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{
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ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;
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}
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static inline struct ecryptfs_sb_info *
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ecryptfs_superblock_to_private(struct super_block *sb)
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{
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return (struct ecryptfs_sb_info *)sb->s_fs_info;
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}
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static inline void
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ecryptfs_set_superblock_private(struct super_block *sb,
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struct ecryptfs_sb_info *sb_info)
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{
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sb->s_fs_info = sb_info;
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}
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static inline struct super_block *
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ecryptfs_superblock_to_lower(struct super_block *sb)
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{
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return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;
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}
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static inline void
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ecryptfs_set_superblock_lower(struct super_block *sb,
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struct super_block *lower_sb)
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{
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((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb;
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}
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static inline struct ecryptfs_dentry_info *
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ecryptfs_dentry_to_private(struct dentry *dentry)
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{
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return (struct ecryptfs_dentry_info *)dentry->d_fsdata;
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}
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static inline void
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ecryptfs_set_dentry_private(struct dentry *dentry,
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struct ecryptfs_dentry_info *dentry_info)
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{
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dentry->d_fsdata = dentry_info;
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}
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static inline struct dentry *
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ecryptfs_dentry_to_lower(struct dentry *dentry)
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{
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return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
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}
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static inline void
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ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry)
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{
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((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry =
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lower_dentry;
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}
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static inline struct vfsmount *
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ecryptfs_dentry_to_lower_mnt(struct dentry *dentry)
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{
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return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;
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}
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static inline void
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ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt)
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{
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((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt =
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lower_mnt;
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}
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#define ecryptfs_printk(type, fmt, arg...) \
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__ecryptfs_printk(type "%s: " fmt, __FUNCTION__, ## arg);
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void __ecryptfs_printk(const char *fmt, ...);
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extern const struct file_operations ecryptfs_main_fops;
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extern const struct file_operations ecryptfs_dir_fops;
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extern struct inode_operations ecryptfs_main_iops;
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extern struct inode_operations ecryptfs_dir_iops;
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extern struct inode_operations ecryptfs_symlink_iops;
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extern struct super_operations ecryptfs_sops;
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extern struct dentry_operations ecryptfs_dops;
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extern struct address_space_operations ecryptfs_aops;
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extern int ecryptfs_verbosity;
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extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;
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extern struct kmem_cache *ecryptfs_file_info_cache;
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extern struct kmem_cache *ecryptfs_dentry_info_cache;
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extern struct kmem_cache *ecryptfs_inode_info_cache;
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extern struct kmem_cache *ecryptfs_sb_info_cache;
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extern struct kmem_cache *ecryptfs_header_cache_0;
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extern struct kmem_cache *ecryptfs_header_cache_1;
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extern struct kmem_cache *ecryptfs_header_cache_2;
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extern struct kmem_cache *ecryptfs_lower_page_cache;
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int ecryptfs_interpose(struct dentry *hidden_dentry,
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struct dentry *this_dentry, struct super_block *sb,
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int flag);
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int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
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int ecryptfs_decode_filename(struct ecryptfs_crypt_stat *crypt_stat,
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const char *name, int length,
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char **decrypted_name);
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int ecryptfs_encode_filename(struct ecryptfs_crypt_stat *crypt_stat,
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const char *name, int length,
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char **encoded_name);
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struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);
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void ecryptfs_dump_hex(char *data, int bytes);
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int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
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int sg_size);
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int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);
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void ecryptfs_rotate_iv(unsigned char *iv);
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void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
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void ecryptfs_destruct_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
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void ecryptfs_destruct_mount_crypt_stat(
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struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
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int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
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int ecryptfs_crypto_api_algify_cipher_name(char **algified_name,
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char *cipher_name,
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char *chaining_modifier);
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int ecryptfs_write_inode_size_to_header(struct file *lower_file,
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struct inode *lower_inode,
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struct inode *inode);
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int ecryptfs_get_lower_page(struct page **lower_page, struct inode *lower_inode,
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struct file *lower_file,
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unsigned long lower_page_index, int byte_offset,
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int region_bytes);
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int
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ecryptfs_commit_lower_page(struct page *lower_page, struct inode *lower_inode,
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struct file *lower_file, int byte_offset,
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int region_size);
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int ecryptfs_copy_page_to_lower(struct page *page, struct inode *lower_inode,
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struct file *lower_file);
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int ecryptfs_do_readpage(struct file *file, struct page *page,
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pgoff_t lower_page_index);
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int ecryptfs_grab_and_map_lower_page(struct page **lower_page,
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char **lower_virt,
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struct inode *lower_inode,
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unsigned long lower_page_index);
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int ecryptfs_writepage_and_release_lower_page(struct page *lower_page,
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struct inode *lower_inode,
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struct writeback_control *wbc);
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int ecryptfs_encrypt_page(struct ecryptfs_page_crypt_context *ctx);
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int ecryptfs_decrypt_page(struct file *file, struct page *page);
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int ecryptfs_write_headers(struct dentry *ecryptfs_dentry,
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struct file *lower_file);
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int ecryptfs_write_headers_virt(char *page_virt,
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struct ecryptfs_crypt_stat *crypt_stat,
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struct dentry *ecryptfs_dentry);
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int ecryptfs_read_headers(struct dentry *ecryptfs_dentry,
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struct file *lower_file);
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int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry);
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int contains_ecryptfs_marker(char *data);
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int ecryptfs_read_header_region(char *data, struct dentry *dentry,
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struct vfsmount *mnt);
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u16 ecryptfs_code_for_cipher_string(struct ecryptfs_crypt_stat *crypt_stat);
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int ecryptfs_cipher_code_to_string(char *str, u16 cipher_code);
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void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
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int ecryptfs_generate_key_packet_set(char *dest_base,
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struct ecryptfs_crypt_stat *crypt_stat,
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struct dentry *ecryptfs_dentry,
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size_t *len, size_t max);
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int process_request_key_err(long err_code);
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int
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ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
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unsigned char *src, struct dentry *ecryptfs_dentry);
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int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
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int
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ecryptfs_process_cipher(struct crypto_blkcipher **key_tfm, char *cipher_name,
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size_t *key_size);
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int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode);
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int ecryptfs_inode_set(struct inode *inode, void *lower_inode);
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void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode);
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int ecryptfs_open_lower_file(struct file **lower_file,
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struct dentry *lower_dentry,
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struct vfsmount *lower_mnt, int flags);
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int ecryptfs_close_lower_file(struct file *lower_file);
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#endif /* #ifndef ECRYPTFS_KERNEL_H */
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