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Michael Halcrow237fead2006-10-04 02:16:22 -07001/**
2 * eCryptfs: Linux filesystem encryption layer
3 * Kernel declarations.
4 *
5 * Copyright (C) 1997-2003 Erez Zadok
6 * Copyright (C) 2001-2003 Stony Brook University
Michael Halcrowf66e8832008-04-29 00:59:51 -07007 * Copyright (C) 2004-2008 International Business Machines Corp.
Michael Halcrow237fead2006-10-04 02:16:22 -07008 * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
Michael Halcrow88b4a072007-02-12 00:53:43 -08009 * Trevor S. Highland <trevor.highland@gmail.com>
10 * Tyler Hicks <tyhicks@ou.edu>
Michael Halcrow237fead2006-10-04 02:16:22 -070011 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License as
14 * published by the Free Software Foundation; either version 2 of the
15 * License, or (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
25 * 02111-1307, USA.
26 */
27
28#ifndef ECRYPTFS_KERNEL_H
29#define ECRYPTFS_KERNEL_H
30
31#include <keys/user-type.h>
32#include <linux/fs.h>
Josef "Jeff" Sipek0cc72dc2006-12-08 02:36:31 -080033#include <linux/fs_stack.h>
Josef "Jeff" Sipekb65d34f2006-12-08 02:36:34 -080034#include <linux/namei.h>
Michael Halcrow237fead2006-10-04 02:16:22 -070035#include <linux/scatterlist.h>
Michael Halcrowdddfa462007-02-12 00:53:44 -080036#include <linux/hash.h>
Michael Halcrow6a3fd922008-04-29 00:59:52 -070037#include <linux/nsproxy.h>
Michael Halcrow237fead2006-10-04 02:16:22 -070038
39/* Version verification for shared data structures w/ userspace */
40#define ECRYPTFS_VERSION_MAJOR 0x00
41#define ECRYPTFS_VERSION_MINOR 0x04
Michael Halcrow45eaab72007-10-16 01:28:05 -070042#define ECRYPTFS_SUPPORTED_FILE_VERSION 0x03
Michael Halcrow237fead2006-10-04 02:16:22 -070043/* These flags indicate which features are supported by the kernel
44 * module; userspace tools such as the mount helper read
45 * ECRYPTFS_VERSIONING_MASK from a sysfs handle in order to determine
46 * how to behave. */
Michael Halcrow17398952007-02-12 00:53:45 -080047#define ECRYPTFS_VERSIONING_PASSPHRASE 0x00000001
48#define ECRYPTFS_VERSIONING_PUBKEY 0x00000002
Michael Halcrow237fead2006-10-04 02:16:22 -070049#define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004
Michael Halcrow17398952007-02-12 00:53:45 -080050#define ECRYPTFS_VERSIONING_POLICY 0x00000008
51#define ECRYPTFS_VERSIONING_XATTR 0x00000010
Michael Halcrowf4aad162007-10-16 01:27:53 -070052#define ECRYPTFS_VERSIONING_MULTKEY 0x00000020
Michael Halcrowf66e8832008-04-29 00:59:51 -070053#define ECRYPTFS_VERSIONING_DEVMISC 0x00000040
Michael Halcrowa34f60f2009-01-06 14:41:58 -080054#define ECRYPTFS_VERSIONING_HMAC 0x00000080
55#define ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION 0x00000100
56#define ECRYPTFS_VERSIONING_GCM 0x00000200
Michael Halcrow237fead2006-10-04 02:16:22 -070057#define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \
Michael Halcrow17398952007-02-12 00:53:45 -080058 | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \
Michael Halcrowdd2a3b72007-02-12 00:53:46 -080059 | ECRYPTFS_VERSIONING_PUBKEY \
Michael Halcrowf4aad162007-10-16 01:27:53 -070060 | ECRYPTFS_VERSIONING_XATTR \
Michael Halcrowf66e8832008-04-29 00:59:51 -070061 | ECRYPTFS_VERSIONING_MULTKEY \
Michael Halcrowa34f60f2009-01-06 14:41:58 -080062 | ECRYPTFS_VERSIONING_DEVMISC \
63 | ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION)
Michael Halcrow237fead2006-10-04 02:16:22 -070064#define ECRYPTFS_MAX_PASSWORD_LENGTH 64
65#define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH
66#define ECRYPTFS_SALT_SIZE 8
67#define ECRYPTFS_SALT_SIZE_HEX (ECRYPTFS_SALT_SIZE*2)
68/* The original signature size is only for what is stored on disk; all
69 * in-memory representations are expanded hex, so it better adapted to
70 * be passed around or referenced on the command line */
71#define ECRYPTFS_SIG_SIZE 8
72#define ECRYPTFS_SIG_SIZE_HEX (ECRYPTFS_SIG_SIZE*2)
73#define ECRYPTFS_PASSWORD_SIG_SIZE ECRYPTFS_SIG_SIZE_HEX
74#define ECRYPTFS_MAX_KEY_BYTES 64
75#define ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 512
76#define ECRYPTFS_DEFAULT_IV_BYTES 16
Michael Halcrow45eaab72007-10-16 01:28:05 -070077#define ECRYPTFS_FILE_VERSION 0x03
Michael Halcrow237fead2006-10-04 02:16:22 -070078#define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096
79#define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192
Michael Halcrow88b4a072007-02-12 00:53:43 -080080#define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32
81#define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ
82#define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3)
Michael Halcrow88b4a072007-02-12 00:53:43 -080083#define ECRYPTFS_MAX_PKI_NAME_BYTES 16
84#define ECRYPTFS_DEFAULT_NUM_USERS 4
85#define ECRYPTFS_MAX_NUM_USERS 32768
Michael Halcrowdd2a3b72007-02-12 00:53:46 -080086#define ECRYPTFS_XATTR_NAME "user.ecryptfs"
Michael Halcrow237fead2006-10-04 02:16:22 -070087
88#define RFC2440_CIPHER_DES3_EDE 0x02
89#define RFC2440_CIPHER_CAST_5 0x03
90#define RFC2440_CIPHER_BLOWFISH 0x04
91#define RFC2440_CIPHER_AES_128 0x07
92#define RFC2440_CIPHER_AES_192 0x08
93#define RFC2440_CIPHER_AES_256 0x09
94#define RFC2440_CIPHER_TWOFISH 0x0a
95#define RFC2440_CIPHER_CAST_6 0x0b
96
Michael Halcrow88b4a072007-02-12 00:53:43 -080097#define RFC2440_CIPHER_RSA 0x01
Michael Halcrow237fead2006-10-04 02:16:22 -070098
99/**
100 * For convenience, we may need to pass around the encrypted session
101 * key between kernel and userspace because the authentication token
102 * may not be extractable. For example, the TPM may not release the
103 * private key, instead requiring the encrypted data and returning the
104 * decrypted data.
105 */
106struct ecryptfs_session_key {
107#define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT 0x00000001
108#define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT 0x00000002
109#define ECRYPTFS_CONTAINS_DECRYPTED_KEY 0x00000004
110#define ECRYPTFS_CONTAINS_ENCRYPTED_KEY 0x00000008
111 u32 flags;
112 u32 encrypted_key_size;
113 u32 decrypted_key_size;
114 u8 encrypted_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
115 u8 decrypted_key[ECRYPTFS_MAX_KEY_BYTES];
116};
117
118struct ecryptfs_password {
119 u32 password_bytes;
120 s32 hash_algo;
121 u32 hash_iterations;
122 u32 session_key_encryption_key_bytes;
123#define ECRYPTFS_PERSISTENT_PASSWORD 0x01
124#define ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET 0x02
125 u32 flags;
126 /* Iterated-hash concatenation of salt and passphrase */
127 u8 session_key_encryption_key[ECRYPTFS_MAX_KEY_BYTES];
128 u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
129 /* Always in expanded hex */
130 u8 salt[ECRYPTFS_SALT_SIZE];
131};
132
133enum ecryptfs_token_types {ECRYPTFS_PASSWORD, ECRYPTFS_PRIVATE_KEY};
134
Michael Halcrow88b4a072007-02-12 00:53:43 -0800135struct ecryptfs_private_key {
136 u32 key_size;
137 u32 data_len;
138 u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
139 char pki_type[ECRYPTFS_MAX_PKI_NAME_BYTES + 1];
140 u8 data[];
141};
142
Michael Halcrow237fead2006-10-04 02:16:22 -0700143/* May be a password or a private key */
144struct ecryptfs_auth_tok {
145 u16 version; /* 8-bit major and 8-bit minor */
146 u16 token_type;
Michael Halcrowf4aad162007-10-16 01:27:53 -0700147#define ECRYPTFS_ENCRYPT_ONLY 0x00000001
Michael Halcrow237fead2006-10-04 02:16:22 -0700148 u32 flags;
149 struct ecryptfs_session_key session_key;
150 u8 reserved[32];
151 union {
152 struct ecryptfs_password password;
Michael Halcrow88b4a072007-02-12 00:53:43 -0800153 struct ecryptfs_private_key private_key;
Michael Halcrow237fead2006-10-04 02:16:22 -0700154 } token;
155} __attribute__ ((packed));
156
157void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);
158extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size);
159extern void ecryptfs_from_hex(char *dst, char *src, int dst_size);
160
161struct ecryptfs_key_record {
162 unsigned char type;
163 size_t enc_key_size;
164 unsigned char sig[ECRYPTFS_SIG_SIZE];
165 unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
166};
167
168struct ecryptfs_auth_tok_list {
169 struct ecryptfs_auth_tok *auth_tok;
170 struct list_head list;
171};
172
173struct ecryptfs_crypt_stat;
174struct ecryptfs_mount_crypt_stat;
175
176struct ecryptfs_page_crypt_context {
177 struct page *page;
178#define ECRYPTFS_PREPARE_COMMIT_MODE 0
179#define ECRYPTFS_WRITEPAGE_MODE 1
180 unsigned int mode;
181 union {
182 struct file *lower_file;
183 struct writeback_control *wbc;
184 } param;
185};
186
187static inline struct ecryptfs_auth_tok *
188ecryptfs_get_key_payload_data(struct key *key)
189{
190 return (struct ecryptfs_auth_tok *)
191 (((struct user_key_payload*)key->payload.data)->data);
192}
193
194#define ECRYPTFS_SUPER_MAGIC 0xf15f
195#define ECRYPTFS_MAX_KEYSET_SIZE 1024
196#define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32
197#define ECRYPTFS_MAX_NUM_ENC_KEYS 64
Michael Halcrow237fead2006-10-04 02:16:22 -0700198#define ECRYPTFS_MAX_IV_BYTES 16 /* 128 bits */
199#define ECRYPTFS_SALT_BYTES 2
200#define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5
201#define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8 /* 4*2 */
Michael Halcrow45eaab72007-10-16 01:28:05 -0700202#define ECRYPTFS_FILE_SIZE_BYTES (sizeof(u64))
Michael Halcrow237fead2006-10-04 02:16:22 -0700203#define ECRYPTFS_DEFAULT_CIPHER "aes"
204#define ECRYPTFS_DEFAULT_KEY_BYTES 16
Michael Halcrow565d97242006-10-30 22:07:17 -0800205#define ECRYPTFS_DEFAULT_HASH "md5"
Michael Halcrow9c79f342009-01-06 14:41:57 -0800206#define ECRYPTFS_TAG_70_DIGEST ECRYPTFS_DEFAULT_HASH
Michael Halcrow88b4a072007-02-12 00:53:43 -0800207#define ECRYPTFS_TAG_1_PACKET_TYPE 0x01
Michael Halcrow237fead2006-10-04 02:16:22 -0700208#define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C
209#define ECRYPTFS_TAG_11_PACKET_TYPE 0xED
Michael Halcrow88b4a072007-02-12 00:53:43 -0800210#define ECRYPTFS_TAG_64_PACKET_TYPE 0x40
211#define ECRYPTFS_TAG_65_PACKET_TYPE 0x41
212#define ECRYPTFS_TAG_66_PACKET_TYPE 0x42
213#define ECRYPTFS_TAG_67_PACKET_TYPE 0x43
Michael Halcrow9c79f342009-01-06 14:41:57 -0800214#define ECRYPTFS_TAG_70_PACKET_TYPE 0x46 /* FNEK-encrypted filename
215 * as dentry name */
216#define ECRYPTFS_TAG_71_PACKET_TYPE 0x47 /* FNEK-encrypted filename in
217 * metadata */
218#define ECRYPTFS_TAG_72_PACKET_TYPE 0x48 /* FEK-encrypted filename as
219 * dentry name */
220#define ECRYPTFS_TAG_73_PACKET_TYPE 0x49 /* FEK-encrypted filename as
221 * metadata */
222/* Constraint: ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES >=
223 * ECRYPTFS_MAX_IV_BYTES */
224#define ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES 16
225#define ECRYPTFS_NON_NULL 0x42 /* A reasonable substitute for NULL */
Michael Halcrow237fead2006-10-04 02:16:22 -0700226#define MD5_DIGEST_SIZE 16
Michael Halcrow9c79f342009-01-06 14:41:57 -0800227#define ECRYPTFS_TAG_70_DIGEST_SIZE MD5_DIGEST_SIZE
228#define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FEK_ENCRYPTED."
229#define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX_SIZE 23
230#define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FNEK_ENCRYPTED."
231#define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE 24
232#define ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN (18 + 1 + 4 + 1 + 32)
Michael Halcrow237fead2006-10-04 02:16:22 -0700233
Michael Halcrowf4aad162007-10-16 01:27:53 -0700234struct ecryptfs_key_sig {
235 struct list_head crypt_stat_list;
236 char keysig[ECRYPTFS_SIG_SIZE_HEX];
237};
238
Michael Halcrowa34f60f2009-01-06 14:41:58 -0800239struct ecryptfs_filename {
240 struct list_head crypt_stat_list;
241#define ECRYPTFS_FILENAME_CONTAINS_DECRYPTED 0x00000001
242 u32 flags;
243 u32 seq_no;
244 char *filename;
245 char *encrypted_filename;
246 size_t filename_size;
247 size_t encrypted_filename_size;
248 char fnek_sig[ECRYPTFS_SIG_SIZE_HEX];
249 char dentry_name[ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN + 1];
250};
251
Michael Halcrow237fead2006-10-04 02:16:22 -0700252/**
253 * This is the primary struct associated with each encrypted file.
254 *
255 * TODO: cache align/pack?
256 */
257struct ecryptfs_crypt_stat {
Michael Halcrowa34f60f2009-01-06 14:41:58 -0800258#define ECRYPTFS_STRUCT_INITIALIZED 0x00000001
259#define ECRYPTFS_POLICY_APPLIED 0x00000002
260#define ECRYPTFS_NEW_FILE 0x00000004
261#define ECRYPTFS_ENCRYPTED 0x00000008
262#define ECRYPTFS_SECURITY_WARNING 0x00000010
263#define ECRYPTFS_ENABLE_HMAC 0x00000020
264#define ECRYPTFS_ENCRYPT_IV_PAGES 0x00000040
265#define ECRYPTFS_KEY_VALID 0x00000080
266#define ECRYPTFS_METADATA_IN_XATTR 0x00000100
267#define ECRYPTFS_VIEW_AS_ENCRYPTED 0x00000200
268#define ECRYPTFS_KEY_SET 0x00000400
269#define ECRYPTFS_ENCRYPT_FILENAMES 0x00000800
270#define ECRYPTFS_ENCFN_USE_MOUNT_FNEK 0x00001000
271#define ECRYPTFS_ENCFN_USE_FEK 0x00002000
Michael Halcrow237fead2006-10-04 02:16:22 -0700272 u32 flags;
273 unsigned int file_version;
274 size_t iv_bytes;
Michael Halcrowcc11bef2008-02-06 01:38:32 -0800275 size_t num_header_bytes_at_front;
Michael Halcrow237fead2006-10-04 02:16:22 -0700276 size_t extent_size; /* Data extent size; default is 4096 */
277 size_t key_size;
278 size_t extent_shift;
279 unsigned int extent_mask;
280 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
Michael Halcrow8bba0662006-10-30 22:07:18 -0800281 struct crypto_blkcipher *tfm;
Michael Halcrow565d97242006-10-30 22:07:17 -0800282 struct crypto_hash *hash_tfm; /* Crypto context for generating
283 * the initialization vectors */
Michael Halcrow237fead2006-10-04 02:16:22 -0700284 unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE];
285 unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
286 unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
Michael Halcrowf4aad162007-10-16 01:27:53 -0700287 struct list_head keysig_list;
288 struct mutex keysig_list_mutex;
Michael Halcrow237fead2006-10-04 02:16:22 -0700289 struct mutex cs_tfm_mutex;
Michael Halcrow565d97242006-10-30 22:07:17 -0800290 struct mutex cs_hash_tfm_mutex;
Michael Halcrow237fead2006-10-04 02:16:22 -0700291 struct mutex cs_mutex;
292};
293
294/* inode private data. */
295struct ecryptfs_inode_info {
296 struct inode vfs_inode;
297 struct inode *wii_inode;
Michael Halcrowda0102a2007-10-16 01:28:07 -0700298 struct file *lower_file;
299 struct mutex lower_file_mutex;
Michael Halcrow237fead2006-10-04 02:16:22 -0700300 struct ecryptfs_crypt_stat crypt_stat;
301};
302
303/* dentry private data. Each dentry must keep track of a lower
304 * vfsmount too. */
305struct ecryptfs_dentry_info {
Josef "Jeff" Sipekb65d34f2006-12-08 02:36:34 -0800306 struct path lower_path;
Michael Halcrow237fead2006-10-04 02:16:22 -0700307 struct ecryptfs_crypt_stat *crypt_stat;
308};
309
Michael Halcrow6c6f57f2007-10-16 01:28:01 -0700310/**
Michael Halcrow45eaab72007-10-16 01:28:05 -0700311 * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint
312 * @flags: Status flags
313 * @mount_crypt_stat_list: These auth_toks hang off the mount-wide
314 * cryptographic context. Every time a new
315 * inode comes into existence, eCryptfs copies
316 * the auth_toks on that list to the set of
317 * auth_toks on the inode's crypt_stat
318 * @global_auth_tok_key: The key from the user's keyring for the sig
319 * @global_auth_tok: The key contents
320 * @sig: The key identifier
321 *
Michael Halcrow6c6f57f2007-10-16 01:28:01 -0700322 * ecryptfs_global_auth_tok structs refer to authentication token keys
323 * in the user keyring that apply to newly created files. A list of
324 * these objects hangs off of the mount_crypt_stat struct for any
325 * given eCryptfs mount. This struct maintains a reference to both the
326 * key contents and the key itself so that the key can be put on
327 * unmount.
328 */
Michael Halcrowf4aad162007-10-16 01:27:53 -0700329struct ecryptfs_global_auth_tok {
330#define ECRYPTFS_AUTH_TOK_INVALID 0x00000001
Tyler Hicks84814d62009-03-13 13:51:59 -0700331#define ECRYPTFS_AUTH_TOK_FNEK 0x00000002
Michael Halcrowf4aad162007-10-16 01:27:53 -0700332 u32 flags;
Michael Halcrow45eaab72007-10-16 01:28:05 -0700333 struct list_head mount_crypt_stat_list;
334 struct key *global_auth_tok_key;
335 struct ecryptfs_auth_tok *global_auth_tok;
336 unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1];
Michael Halcrowf4aad162007-10-16 01:27:53 -0700337};
338
Michael Halcrow6c6f57f2007-10-16 01:28:01 -0700339/**
Michael Halcrow45eaab72007-10-16 01:28:05 -0700340 * ecryptfs_key_tfm - Persistent key tfm
341 * @key_tfm: crypto API handle to the key
342 * @key_size: Key size in bytes
343 * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is
344 * using the persistent TFM at any point in time
345 * @key_tfm_list: Handle to hang this off the module-wide TFM list
346 * @cipher_name: String name for the cipher for this TFM
347 *
Michael Halcrow6c6f57f2007-10-16 01:28:01 -0700348 * Typically, eCryptfs will use the same ciphers repeatedly throughout
349 * the course of its operations. In order to avoid unnecessarily
350 * destroying and initializing the same cipher repeatedly, eCryptfs
351 * keeps a list of crypto API contexts around to use when needed.
352 */
Michael Halcrowf4aad162007-10-16 01:27:53 -0700353struct ecryptfs_key_tfm {
354 struct crypto_blkcipher *key_tfm;
355 size_t key_size;
356 struct mutex key_tfm_mutex;
Michael Halcrow45eaab72007-10-16 01:28:05 -0700357 struct list_head key_tfm_list;
Michael Halcrowf4aad162007-10-16 01:27:53 -0700358 unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
359};
360
Eric Sandeenaf440f52008-02-06 01:38:37 -0800361extern struct mutex key_tfm_list_mutex;
362
Michael Halcrow237fead2006-10-04 02:16:22 -0700363/**
364 * This struct is to enable a mount-wide passphrase/salt combo. This
365 * is more or less a stopgap to provide similar functionality to other
366 * crypto filesystems like EncFS or CFS until full policy support is
367 * implemented in eCryptfs.
368 */
369struct ecryptfs_mount_crypt_stat {
370 /* Pointers to memory we do not own, do not free these */
371#define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001
Michael Halcrow17398952007-02-12 00:53:45 -0800372#define ECRYPTFS_XATTR_METADATA_ENABLED 0x00000002
373#define ECRYPTFS_ENCRYPTED_VIEW_ENABLED 0x00000004
Michael Halcrowf4aad162007-10-16 01:27:53 -0700374#define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED 0x00000008
Michael Halcrow9c79f342009-01-06 14:41:57 -0800375#define ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES 0x00000010
376#define ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK 0x00000020
377#define ECRYPTFS_GLOBAL_ENCFN_USE_FEK 0x00000040
Michael Halcrow237fead2006-10-04 02:16:22 -0700378 u32 flags;
Michael Halcrowf4aad162007-10-16 01:27:53 -0700379 struct list_head global_auth_tok_list;
380 struct mutex global_auth_tok_list_mutex;
381 size_t num_global_auth_toks;
Michael Halcrow237fead2006-10-04 02:16:22 -0700382 size_t global_default_cipher_key_size;
Michael Halcrow9c79f342009-01-06 14:41:57 -0800383 size_t global_default_fn_cipher_key_bytes;
Michael Halcrow237fead2006-10-04 02:16:22 -0700384 unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE
385 + 1];
Michael Halcrow9c79f342009-01-06 14:41:57 -0800386 unsigned char global_default_fn_cipher_name[
387 ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
388 char global_default_fnek_sig[ECRYPTFS_SIG_SIZE_HEX + 1];
Michael Halcrow237fead2006-10-04 02:16:22 -0700389};
390
391/* superblock private data. */
392struct ecryptfs_sb_info {
393 struct super_block *wsi_sb;
394 struct ecryptfs_mount_crypt_stat mount_crypt_stat;
395};
396
397/* file private data. */
398struct ecryptfs_file_info {
399 struct file *wfi_file;
400 struct ecryptfs_crypt_stat *crypt_stat;
401};
402
403/* auth_tok <=> encrypted_session_key mappings */
404struct ecryptfs_auth_tok_list_item {
405 unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES];
406 struct list_head list;
407 struct ecryptfs_auth_tok auth_tok;
408};
409
Michael Halcrow88b4a072007-02-12 00:53:43 -0800410struct ecryptfs_message {
Michael Halcrowf66e8832008-04-29 00:59:51 -0700411 /* Can never be greater than ecryptfs_message_buf_len */
412 /* Used to find the parent msg_ctx */
413 /* Inherits from msg_ctx->index */
Michael Halcrow88b4a072007-02-12 00:53:43 -0800414 u32 index;
415 u32 data_len;
416 u8 data[];
417};
418
419struct ecryptfs_msg_ctx {
Michael Halcrowf66e8832008-04-29 00:59:51 -0700420#define ECRYPTFS_MSG_CTX_STATE_FREE 0x01
421#define ECRYPTFS_MSG_CTX_STATE_PENDING 0x02
422#define ECRYPTFS_MSG_CTX_STATE_DONE 0x03
423#define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04
424 u8 state;
425#define ECRYPTFS_MSG_HELO 100
426#define ECRYPTFS_MSG_QUIT 101
427#define ECRYPTFS_MSG_REQUEST 102
428#define ECRYPTFS_MSG_RESPONSE 103
429 u8 type;
430 u32 index;
431 /* Counter converts to a sequence number. Each message sent
432 * out for which we expect a response has an associated
433 * sequence number. The response must have the same sequence
434 * number as the counter for the msg_stc for the message to be
435 * valid. */
436 u32 counter;
437 size_t msg_size;
Michael Halcrow88b4a072007-02-12 00:53:43 -0800438 struct ecryptfs_message *msg;
439 struct task_struct *task;
440 struct list_head node;
Michael Halcrowf66e8832008-04-29 00:59:51 -0700441 struct list_head daemon_out_list;
Michael Halcrow88b4a072007-02-12 00:53:43 -0800442 struct mutex mux;
443};
444
Michael Halcrowf66e8832008-04-29 00:59:51 -0700445struct ecryptfs_daemon;
446
447struct ecryptfs_daemon {
448#define ECRYPTFS_DAEMON_IN_READ 0x00000001
449#define ECRYPTFS_DAEMON_IN_POLL 0x00000002
450#define ECRYPTFS_DAEMON_ZOMBIE 0x00000004
451#define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008
452 u32 flags;
453 u32 num_queued_msg_ctx;
Michael Halcrow6a3fd922008-04-29 00:59:52 -0700454 struct pid *pid;
Michael Halcrowf66e8832008-04-29 00:59:51 -0700455 uid_t euid;
Michael Halcrow6a3fd922008-04-29 00:59:52 -0700456 struct user_namespace *user_ns;
Michael Halcrowf66e8832008-04-29 00:59:51 -0700457 struct task_struct *task;
458 struct mutex mux;
459 struct list_head msg_ctx_out_queue;
460 wait_queue_head_t wait;
461 struct hlist_node euid_chain;
Michael Halcrow88b4a072007-02-12 00:53:43 -0800462};
463
Michael Halcrowf66e8832008-04-29 00:59:51 -0700464extern struct mutex ecryptfs_daemon_hash_mux;
465
Michael Halcrow237fead2006-10-04 02:16:22 -0700466static inline struct ecryptfs_file_info *
467ecryptfs_file_to_private(struct file *file)
468{
469 return (struct ecryptfs_file_info *)file->private_data;
470}
471
472static inline void
473ecryptfs_set_file_private(struct file *file,
474 struct ecryptfs_file_info *file_info)
475{
476 file->private_data = file_info;
477}
478
479static inline struct file *ecryptfs_file_to_lower(struct file *file)
480{
481 return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;
482}
483
484static inline void
485ecryptfs_set_file_lower(struct file *file, struct file *lower_file)
486{
487 ((struct ecryptfs_file_info *)file->private_data)->wfi_file =
488 lower_file;
489}
490
491static inline struct ecryptfs_inode_info *
492ecryptfs_inode_to_private(struct inode *inode)
493{
494 return container_of(inode, struct ecryptfs_inode_info, vfs_inode);
495}
496
497static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode)
498{
499 return ecryptfs_inode_to_private(inode)->wii_inode;
500}
501
502static inline void
503ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode)
504{
505 ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;
506}
507
508static inline struct ecryptfs_sb_info *
509ecryptfs_superblock_to_private(struct super_block *sb)
510{
511 return (struct ecryptfs_sb_info *)sb->s_fs_info;
512}
513
514static inline void
515ecryptfs_set_superblock_private(struct super_block *sb,
516 struct ecryptfs_sb_info *sb_info)
517{
518 sb->s_fs_info = sb_info;
519}
520
521static inline struct super_block *
522ecryptfs_superblock_to_lower(struct super_block *sb)
523{
524 return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;
525}
526
527static inline void
528ecryptfs_set_superblock_lower(struct super_block *sb,
529 struct super_block *lower_sb)
530{
531 ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb;
532}
533
534static inline struct ecryptfs_dentry_info *
535ecryptfs_dentry_to_private(struct dentry *dentry)
536{
537 return (struct ecryptfs_dentry_info *)dentry->d_fsdata;
538}
539
540static inline void
541ecryptfs_set_dentry_private(struct dentry *dentry,
542 struct ecryptfs_dentry_info *dentry_info)
543{
544 dentry->d_fsdata = dentry_info;
545}
546
547static inline struct dentry *
548ecryptfs_dentry_to_lower(struct dentry *dentry)
549{
Josef "Jeff" Sipekb65d34f2006-12-08 02:36:34 -0800550 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
Michael Halcrow237fead2006-10-04 02:16:22 -0700551}
552
553static inline void
554ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry)
555{
Josef "Jeff" Sipekb65d34f2006-12-08 02:36:34 -0800556 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry =
Michael Halcrow237fead2006-10-04 02:16:22 -0700557 lower_dentry;
558}
559
560static inline struct vfsmount *
561ecryptfs_dentry_to_lower_mnt(struct dentry *dentry)
562{
Josef "Jeff" Sipekb65d34f2006-12-08 02:36:34 -0800563 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;
Michael Halcrow237fead2006-10-04 02:16:22 -0700564}
565
566static inline void
567ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt)
568{
Josef "Jeff" Sipekb65d34f2006-12-08 02:36:34 -0800569 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt =
Michael Halcrow237fead2006-10-04 02:16:22 -0700570 lower_mnt;
571}
572
573#define ecryptfs_printk(type, fmt, arg...) \
Harvey Harrison18d1dbf2008-04-29 00:59:48 -0700574 __ecryptfs_printk(type "%s: " fmt, __func__, ## arg);
Michael Halcrow237fead2006-10-04 02:16:22 -0700575void __ecryptfs_printk(const char *fmt, ...);
576
577extern const struct file_operations ecryptfs_main_fops;
578extern const struct file_operations ecryptfs_dir_fops;
Arjan van de Ven754661f2007-02-12 00:55:38 -0800579extern const struct inode_operations ecryptfs_main_iops;
580extern const struct inode_operations ecryptfs_dir_iops;
581extern const struct inode_operations ecryptfs_symlink_iops;
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800582extern const struct super_operations ecryptfs_sops;
Al Viro5a3fd052009-02-20 05:57:52 +0000583extern const struct dentry_operations ecryptfs_dops;
Michael Halcrow237fead2006-10-04 02:16:22 -0700584extern struct address_space_operations ecryptfs_aops;
585extern int ecryptfs_verbosity;
Michael Halcrow88b4a072007-02-12 00:53:43 -0800586extern unsigned int ecryptfs_message_buf_len;
587extern signed long ecryptfs_message_wait_timeout;
588extern unsigned int ecryptfs_number_of_users;
Michael Halcrow237fead2006-10-04 02:16:22 -0700589
590extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;
591extern struct kmem_cache *ecryptfs_file_info_cache;
592extern struct kmem_cache *ecryptfs_dentry_info_cache;
593extern struct kmem_cache *ecryptfs_inode_info_cache;
594extern struct kmem_cache *ecryptfs_sb_info_cache;
Michael Halcrow237fead2006-10-04 02:16:22 -0700595extern struct kmem_cache *ecryptfs_header_cache_1;
596extern struct kmem_cache *ecryptfs_header_cache_2;
Michael Halcrowdd2a3b72007-02-12 00:53:46 -0800597extern struct kmem_cache *ecryptfs_xattr_cache;
Michael Halcroweb95e7f2007-02-16 01:28:40 -0800598extern struct kmem_cache *ecryptfs_key_record_cache;
Michael Halcrowf4aad162007-10-16 01:27:53 -0700599extern struct kmem_cache *ecryptfs_key_sig_cache;
600extern struct kmem_cache *ecryptfs_global_auth_tok_cache;
601extern struct kmem_cache *ecryptfs_key_tfm_cache;
Michael Halcrow746f1e52008-07-23 21:30:02 -0700602extern struct kmem_cache *ecryptfs_open_req_cache;
603
604struct ecryptfs_open_req {
605#define ECRYPTFS_REQ_PROCESSED 0x00000001
606#define ECRYPTFS_REQ_DROPPED 0x00000002
607#define ECRYPTFS_REQ_ZOMBIE 0x00000004
608 u32 flags;
609 struct file **lower_file;
610 struct dentry *lower_dentry;
611 struct vfsmount *lower_mnt;
612 wait_queue_head_t wait;
613 struct mutex mux;
614 struct list_head kthread_ctl_list;
615};
Michael Halcrow237fead2006-10-04 02:16:22 -0700616
Michael Halcrow72b55ff2008-07-23 21:30:07 -0700617#define ECRYPTFS_INTERPOSE_FLAG_D_ADD 0x00000001
Michael Halcrow237fead2006-10-04 02:16:22 -0700618int ecryptfs_interpose(struct dentry *hidden_dentry,
619 struct dentry *this_dentry, struct super_block *sb,
Michael Halcrow72b55ff2008-07-23 21:30:07 -0700620 u32 flags);
Michael Halcrowa34f60f2009-01-06 14:41:58 -0800621int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
622 struct dentry *lower_dentry,
Michael Halcrowa34f60f2009-01-06 14:41:58 -0800623 struct inode *ecryptfs_dir_inode,
624 struct nameidata *ecryptfs_nd);
625int ecryptfs_decode_and_decrypt_filename(char **decrypted_name,
626 size_t *decrypted_name_size,
627 struct dentry *ecryptfs_dentry,
628 const char *name, size_t name_size);
Michael Halcrow237fead2006-10-04 02:16:22 -0700629int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
Michael Halcrowa34f60f2009-01-06 14:41:58 -0800630int ecryptfs_encrypt_and_encode_filename(
631 char **encoded_name,
632 size_t *encoded_name_size,
633 struct ecryptfs_crypt_stat *crypt_stat,
634 struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
635 const char *name, size_t name_size);
Michael Halcrow237fead2006-10-04 02:16:22 -0700636struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);
Michael Halcrow237fead2006-10-04 02:16:22 -0700637void ecryptfs_dump_hex(char *data, int bytes);
638int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
639 int sg_size);
640int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);
641void ecryptfs_rotate_iv(unsigned char *iv);
642void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
Michael Halcrowfcd12832007-10-16 01:28:01 -0700643void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
644void ecryptfs_destroy_mount_crypt_stat(
Michael Halcrow237fead2006-10-04 02:16:22 -0700645 struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
646int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
Michael Halcrowb6c1d8f2007-10-16 01:28:13 -0700647int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode);
Michael Halcrow0216f7f2007-10-16 01:28:08 -0700648int ecryptfs_encrypt_page(struct page *page);
649int ecryptfs_decrypt_page(struct page *page);
Michael Halcrowd7cdc5f2007-10-16 01:28:10 -0700650int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry);
651int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry);
Michael Halcrow237fead2006-10-04 02:16:22 -0700652int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry);
Michael Halcrowd7cdc5f2007-10-16 01:28:10 -0700653int ecryptfs_read_and_validate_header_region(char *data,
654 struct inode *ecryptfs_inode);
Michael Halcrowdd2a3b72007-02-12 00:53:46 -0800655int ecryptfs_read_and_validate_xattr_region(char *page_virt,
656 struct dentry *ecryptfs_dentry);
Michael Halcrow9c79f342009-01-06 14:41:57 -0800657u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes);
Trevor Highland19e66a62008-02-06 01:38:36 -0800658int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code);
Michael Halcrow237fead2006-10-04 02:16:22 -0700659void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
660int ecryptfs_generate_key_packet_set(char *dest_base,
661 struct ecryptfs_crypt_stat *crypt_stat,
662 struct dentry *ecryptfs_dentry,
663 size_t *len, size_t max);
Michael Halcrow237fead2006-10-04 02:16:22 -0700664int
665ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
666 unsigned char *src, struct dentry *ecryptfs_dentry);
667int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
Michael Halcrow237fead2006-10-04 02:16:22 -0700668int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode);
669int ecryptfs_inode_set(struct inode *inode, void *lower_inode);
670void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode);
Michael Halcrowd7cdc5f2007-10-16 01:28:10 -0700671ssize_t
672ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
673 void *value, size_t size);
Michael Halcrowdd2a3b72007-02-12 00:53:46 -0800674int
675ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
676 size_t size, int flags);
Michael Halcrowd7cdc5f2007-10-16 01:28:10 -0700677int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode);
Tyler Hicks624ae522008-10-15 22:02:51 -0700678int ecryptfs_process_helo(uid_t euid, struct user_namespace *user_ns,
679 struct pid *pid);
Michael Halcrow6a3fd922008-04-29 00:59:52 -0700680int ecryptfs_process_quit(uid_t euid, struct user_namespace *user_ns,
681 struct pid *pid);
682int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
683 struct user_namespace *user_ns, struct pid *pid,
684 u32 seq);
Tyler Hicks624ae522008-10-15 22:02:51 -0700685int ecryptfs_send_message(char *data, int data_len,
Michael Halcrow88b4a072007-02-12 00:53:43 -0800686 struct ecryptfs_msg_ctx **msg_ctx);
687int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
688 struct ecryptfs_message **emsg);
Tyler Hicks624ae522008-10-15 22:02:51 -0700689int ecryptfs_init_messaging(void);
690void ecryptfs_release_messaging(void);
Michael Halcrow88b4a072007-02-12 00:53:43 -0800691
Michael Halcrowe77a56d2007-02-12 00:53:47 -0800692void
693ecryptfs_write_header_metadata(char *virt,
694 struct ecryptfs_crypt_stat *crypt_stat,
695 size_t *written);
Michael Halcrowf4aad162007-10-16 01:27:53 -0700696int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig);
697int
698ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
Tyler Hicks84814d62009-03-13 13:51:59 -0700699 char *sig, u32 global_auth_tok_flags);
Michael Halcrowf4aad162007-10-16 01:27:53 -0700700int ecryptfs_get_global_auth_tok_for_sig(
701 struct ecryptfs_global_auth_tok **global_auth_tok,
702 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig);
703int
704ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
705 size_t key_size);
706int ecryptfs_init_crypto(void);
Michael Halcrowfcd12832007-10-16 01:28:01 -0700707int ecryptfs_destroy_crypto(void);
Eric Sandeenaf440f52008-02-06 01:38:37 -0800708int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm);
Michael Halcrowf4aad162007-10-16 01:27:53 -0700709int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
710 struct mutex **tfm_mutex,
711 char *cipher_name);
712int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
713 struct ecryptfs_auth_tok **auth_tok,
714 char *sig);
Michael Halcrowda0102a2007-10-16 01:28:07 -0700715int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
716 loff_t offset, size_t size);
717int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
718 struct page *page_for_lower,
719 size_t offset_in_page, size_t size);
720int ecryptfs_write(struct file *ecryptfs_file, char *data, loff_t offset,
721 size_t size);
722int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
723 struct inode *ecryptfs_inode);
724int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
725 pgoff_t page_index,
726 size_t offset_in_page, size_t size,
727 struct inode *ecryptfs_inode);
Michael Halcrow16a72c42007-10-16 01:28:14 -0700728struct page *ecryptfs_get_locked_page(struct file *file, loff_t index);
Michael Halcrowf66e8832008-04-29 00:59:51 -0700729int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon);
Michael Halcrow6a3fd922008-04-29 00:59:52 -0700730int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon, uid_t euid,
731 struct user_namespace *user_ns);
Michael Halcrowf66e8832008-04-29 00:59:51 -0700732int ecryptfs_parse_packet_length(unsigned char *data, size_t *size,
733 size_t *length_size);
734int ecryptfs_write_packet_length(char *dest, size_t size,
735 size_t *packet_size_length);
736int ecryptfs_init_ecryptfs_miscdev(void);
737void ecryptfs_destroy_ecryptfs_miscdev(void);
738int ecryptfs_send_miscdev(char *data, size_t data_size,
739 struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
740 u16 msg_flags, struct ecryptfs_daemon *daemon);
741void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx);
742int
Michael Halcrow6a3fd922008-04-29 00:59:52 -0700743ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, uid_t euid,
744 struct user_namespace *user_ns, struct pid *pid);
Michael Halcrow746f1e52008-07-23 21:30:02 -0700745int ecryptfs_init_kthread(void);
746void ecryptfs_destroy_kthread(void);
747int ecryptfs_privileged_open(struct file **lower_file,
748 struct dentry *lower_dentry,
David Howells745ca242008-11-14 10:39:22 +1100749 struct vfsmount *lower_mnt,
750 const struct cred *cred);
Michael Halcrow72b55ff2008-07-23 21:30:07 -0700751int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry);
Michael Halcrow9c79f342009-01-06 14:41:57 -0800752int
753ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
754 size_t *packet_size,
755 struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
756 char *filename, size_t filename_size);
757int
758ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
759 size_t *packet_size,
760 struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
761 char *data, size_t max_packet_size);
Michael Halcrowa34f60f2009-01-06 14:41:58 -0800762int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat,
763 loff_t offset);
Michael Halcrow88b4a072007-02-12 00:53:43 -0800764
Michael Halcrow237fead2006-10-04 02:16:22 -0700765#endif /* #ifndef ECRYPTFS_KERNEL_H */