blob: 0032a9f5a3a92045658baf77d736ee07c83525cc [file] [log] [blame]
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>
Jens Axboe9df9c8b2010-04-22 12:22:04 +020038#include <linux/backing-dev.h>
Michael Halcrow237fead2006-10-04 02:16:22 -070039
40/* Version verification for shared data structures w/ userspace */
41#define ECRYPTFS_VERSION_MAJOR 0x00
42#define ECRYPTFS_VERSION_MINOR 0x04
Michael Halcrow45eaab72007-10-16 01:28:05 -070043#define ECRYPTFS_SUPPORTED_FILE_VERSION 0x03
Michael Halcrow237fead2006-10-04 02:16:22 -070044/* These flags indicate which features are supported by the kernel
45 * module; userspace tools such as the mount helper read
46 * ECRYPTFS_VERSIONING_MASK from a sysfs handle in order to determine
47 * how to behave. */
Michael Halcrow17398952007-02-12 00:53:45 -080048#define ECRYPTFS_VERSIONING_PASSPHRASE 0x00000001
49#define ECRYPTFS_VERSIONING_PUBKEY 0x00000002
Michael Halcrow237fead2006-10-04 02:16:22 -070050#define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004
Michael Halcrow17398952007-02-12 00:53:45 -080051#define ECRYPTFS_VERSIONING_POLICY 0x00000008
52#define ECRYPTFS_VERSIONING_XATTR 0x00000010
Michael Halcrowf4aad162007-10-16 01:27:53 -070053#define ECRYPTFS_VERSIONING_MULTKEY 0x00000020
Michael Halcrowf66e8832008-04-29 00:59:51 -070054#define ECRYPTFS_VERSIONING_DEVMISC 0x00000040
Michael Halcrowa34f60f2009-01-06 14:41:58 -080055#define ECRYPTFS_VERSIONING_HMAC 0x00000080
56#define ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION 0x00000100
57#define ECRYPTFS_VERSIONING_GCM 0x00000200
Michael Halcrow237fead2006-10-04 02:16:22 -070058#define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \
Michael Halcrow17398952007-02-12 00:53:45 -080059 | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \
Michael Halcrowdd2a3b72007-02-12 00:53:46 -080060 | ECRYPTFS_VERSIONING_PUBKEY \
Michael Halcrowf4aad162007-10-16 01:27:53 -070061 | ECRYPTFS_VERSIONING_XATTR \
Michael Halcrowf66e8832008-04-29 00:59:51 -070062 | ECRYPTFS_VERSIONING_MULTKEY \
Michael Halcrowa34f60f2009-01-06 14:41:58 -080063 | ECRYPTFS_VERSIONING_DEVMISC \
64 | ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION)
Michael Halcrow237fead2006-10-04 02:16:22 -070065#define ECRYPTFS_MAX_PASSWORD_LENGTH 64
66#define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH
67#define ECRYPTFS_SALT_SIZE 8
68#define ECRYPTFS_SALT_SIZE_HEX (ECRYPTFS_SALT_SIZE*2)
69/* The original signature size is only for what is stored on disk; all
70 * in-memory representations are expanded hex, so it better adapted to
71 * be passed around or referenced on the command line */
72#define ECRYPTFS_SIG_SIZE 8
73#define ECRYPTFS_SIG_SIZE_HEX (ECRYPTFS_SIG_SIZE*2)
74#define ECRYPTFS_PASSWORD_SIG_SIZE ECRYPTFS_SIG_SIZE_HEX
75#define ECRYPTFS_MAX_KEY_BYTES 64
76#define ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 512
77#define ECRYPTFS_DEFAULT_IV_BYTES 16
Michael Halcrow45eaab72007-10-16 01:28:05 -070078#define ECRYPTFS_FILE_VERSION 0x03
Michael Halcrow237fead2006-10-04 02:16:22 -070079#define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096
80#define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192
Michael Halcrow88b4a072007-02-12 00:53:43 -080081#define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32
82#define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ
83#define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3)
Michael Halcrow88b4a072007-02-12 00:53:43 -080084#define ECRYPTFS_MAX_PKI_NAME_BYTES 16
85#define ECRYPTFS_DEFAULT_NUM_USERS 4
86#define ECRYPTFS_MAX_NUM_USERS 32768
Michael Halcrowdd2a3b72007-02-12 00:53:46 -080087#define ECRYPTFS_XATTR_NAME "user.ecryptfs"
Michael Halcrow237fead2006-10-04 02:16:22 -070088
89#define RFC2440_CIPHER_DES3_EDE 0x02
90#define RFC2440_CIPHER_CAST_5 0x03
91#define RFC2440_CIPHER_BLOWFISH 0x04
92#define RFC2440_CIPHER_AES_128 0x07
93#define RFC2440_CIPHER_AES_192 0x08
94#define RFC2440_CIPHER_AES_256 0x09
95#define RFC2440_CIPHER_TWOFISH 0x0a
96#define RFC2440_CIPHER_CAST_6 0x0b
97
Michael Halcrow88b4a072007-02-12 00:53:43 -080098#define RFC2440_CIPHER_RSA 0x01
Michael Halcrow237fead2006-10-04 02:16:22 -070099
100/**
101 * For convenience, we may need to pass around the encrypted session
102 * key between kernel and userspace because the authentication token
103 * may not be extractable. For example, the TPM may not release the
104 * private key, instead requiring the encrypted data and returning the
105 * decrypted data.
106 */
107struct ecryptfs_session_key {
108#define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT 0x00000001
109#define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT 0x00000002
110#define ECRYPTFS_CONTAINS_DECRYPTED_KEY 0x00000004
111#define ECRYPTFS_CONTAINS_ENCRYPTED_KEY 0x00000008
112 u32 flags;
113 u32 encrypted_key_size;
114 u32 decrypted_key_size;
115 u8 encrypted_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
116 u8 decrypted_key[ECRYPTFS_MAX_KEY_BYTES];
117};
118
119struct ecryptfs_password {
120 u32 password_bytes;
121 s32 hash_algo;
122 u32 hash_iterations;
123 u32 session_key_encryption_key_bytes;
124#define ECRYPTFS_PERSISTENT_PASSWORD 0x01
125#define ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET 0x02
126 u32 flags;
127 /* Iterated-hash concatenation of salt and passphrase */
128 u8 session_key_encryption_key[ECRYPTFS_MAX_KEY_BYTES];
129 u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
130 /* Always in expanded hex */
131 u8 salt[ECRYPTFS_SALT_SIZE];
132};
133
134enum ecryptfs_token_types {ECRYPTFS_PASSWORD, ECRYPTFS_PRIVATE_KEY};
135
Michael Halcrow88b4a072007-02-12 00:53:43 -0800136struct ecryptfs_private_key {
137 u32 key_size;
138 u32 data_len;
139 u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
140 char pki_type[ECRYPTFS_MAX_PKI_NAME_BYTES + 1];
141 u8 data[];
142};
143
Michael Halcrow237fead2006-10-04 02:16:22 -0700144/* May be a password or a private key */
145struct ecryptfs_auth_tok {
146 u16 version; /* 8-bit major and 8-bit minor */
147 u16 token_type;
Michael Halcrowf4aad162007-10-16 01:27:53 -0700148#define ECRYPTFS_ENCRYPT_ONLY 0x00000001
Michael Halcrow237fead2006-10-04 02:16:22 -0700149 u32 flags;
150 struct ecryptfs_session_key session_key;
151 u8 reserved[32];
152 union {
153 struct ecryptfs_password password;
Michael Halcrow88b4a072007-02-12 00:53:43 -0800154 struct ecryptfs_private_key private_key;
Michael Halcrow237fead2006-10-04 02:16:22 -0700155 } token;
156} __attribute__ ((packed));
157
158void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);
159extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size);
160extern void ecryptfs_from_hex(char *dst, char *src, int dst_size);
161
162struct ecryptfs_key_record {
163 unsigned char type;
164 size_t enc_key_size;
165 unsigned char sig[ECRYPTFS_SIG_SIZE];
166 unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
167};
168
169struct ecryptfs_auth_tok_list {
170 struct ecryptfs_auth_tok *auth_tok;
171 struct list_head list;
172};
173
174struct ecryptfs_crypt_stat;
175struct ecryptfs_mount_crypt_stat;
176
177struct ecryptfs_page_crypt_context {
178 struct page *page;
179#define ECRYPTFS_PREPARE_COMMIT_MODE 0
180#define ECRYPTFS_WRITEPAGE_MODE 1
181 unsigned int mode;
182 union {
183 struct file *lower_file;
184 struct writeback_control *wbc;
185 } param;
186};
187
188static inline struct ecryptfs_auth_tok *
189ecryptfs_get_key_payload_data(struct key *key)
190{
191 return (struct ecryptfs_auth_tok *)
192 (((struct user_key_payload*)key->payload.data)->data);
193}
194
195#define ECRYPTFS_SUPER_MAGIC 0xf15f
196#define ECRYPTFS_MAX_KEYSET_SIZE 1024
197#define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32
198#define ECRYPTFS_MAX_NUM_ENC_KEYS 64
Michael Halcrow237fead2006-10-04 02:16:22 -0700199#define ECRYPTFS_MAX_IV_BYTES 16 /* 128 bits */
200#define ECRYPTFS_SALT_BYTES 2
201#define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5
202#define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8 /* 4*2 */
Michael Halcrow45eaab72007-10-16 01:28:05 -0700203#define ECRYPTFS_FILE_SIZE_BYTES (sizeof(u64))
Michael Halcrow237fead2006-10-04 02:16:22 -0700204#define ECRYPTFS_DEFAULT_CIPHER "aes"
205#define ECRYPTFS_DEFAULT_KEY_BYTES 16
Michael Halcrow565d97242006-10-30 22:07:17 -0800206#define ECRYPTFS_DEFAULT_HASH "md5"
Michael Halcrow9c79f342009-01-06 14:41:57 -0800207#define ECRYPTFS_TAG_70_DIGEST ECRYPTFS_DEFAULT_HASH
Michael Halcrow88b4a072007-02-12 00:53:43 -0800208#define ECRYPTFS_TAG_1_PACKET_TYPE 0x01
Michael Halcrow237fead2006-10-04 02:16:22 -0700209#define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C
210#define ECRYPTFS_TAG_11_PACKET_TYPE 0xED
Michael Halcrow88b4a072007-02-12 00:53:43 -0800211#define ECRYPTFS_TAG_64_PACKET_TYPE 0x40
212#define ECRYPTFS_TAG_65_PACKET_TYPE 0x41
213#define ECRYPTFS_TAG_66_PACKET_TYPE 0x42
214#define ECRYPTFS_TAG_67_PACKET_TYPE 0x43
Michael Halcrow9c79f342009-01-06 14:41:57 -0800215#define ECRYPTFS_TAG_70_PACKET_TYPE 0x46 /* FNEK-encrypted filename
216 * as dentry name */
217#define ECRYPTFS_TAG_71_PACKET_TYPE 0x47 /* FNEK-encrypted filename in
218 * metadata */
219#define ECRYPTFS_TAG_72_PACKET_TYPE 0x48 /* FEK-encrypted filename as
220 * dentry name */
221#define ECRYPTFS_TAG_73_PACKET_TYPE 0x49 /* FEK-encrypted filename as
222 * metadata */
223/* Constraint: ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES >=
224 * ECRYPTFS_MAX_IV_BYTES */
225#define ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES 16
226#define ECRYPTFS_NON_NULL 0x42 /* A reasonable substitute for NULL */
Michael Halcrow237fead2006-10-04 02:16:22 -0700227#define MD5_DIGEST_SIZE 16
Michael Halcrow9c79f342009-01-06 14:41:57 -0800228#define ECRYPTFS_TAG_70_DIGEST_SIZE MD5_DIGEST_SIZE
229#define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FEK_ENCRYPTED."
230#define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX_SIZE 23
231#define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FNEK_ENCRYPTED."
232#define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE 24
233#define ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN (18 + 1 + 4 + 1 + 32)
Michael Halcrow237fead2006-10-04 02:16:22 -0700234
Michael Halcrowf4aad162007-10-16 01:27:53 -0700235struct ecryptfs_key_sig {
236 struct list_head crypt_stat_list;
237 char keysig[ECRYPTFS_SIG_SIZE_HEX];
238};
239
Michael Halcrowa34f60f2009-01-06 14:41:58 -0800240struct ecryptfs_filename {
241 struct list_head crypt_stat_list;
242#define ECRYPTFS_FILENAME_CONTAINS_DECRYPTED 0x00000001
243 u32 flags;
244 u32 seq_no;
245 char *filename;
246 char *encrypted_filename;
247 size_t filename_size;
248 size_t encrypted_filename_size;
249 char fnek_sig[ECRYPTFS_SIG_SIZE_HEX];
250 char dentry_name[ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN + 1];
251};
252
Michael Halcrow237fead2006-10-04 02:16:22 -0700253/**
254 * This is the primary struct associated with each encrypted file.
255 *
256 * TODO: cache align/pack?
257 */
258struct ecryptfs_crypt_stat {
Michael Halcrowa34f60f2009-01-06 14:41:58 -0800259#define ECRYPTFS_STRUCT_INITIALIZED 0x00000001
260#define ECRYPTFS_POLICY_APPLIED 0x00000002
261#define ECRYPTFS_NEW_FILE 0x00000004
262#define ECRYPTFS_ENCRYPTED 0x00000008
263#define ECRYPTFS_SECURITY_WARNING 0x00000010
264#define ECRYPTFS_ENABLE_HMAC 0x00000020
265#define ECRYPTFS_ENCRYPT_IV_PAGES 0x00000040
266#define ECRYPTFS_KEY_VALID 0x00000080
267#define ECRYPTFS_METADATA_IN_XATTR 0x00000100
268#define ECRYPTFS_VIEW_AS_ENCRYPTED 0x00000200
269#define ECRYPTFS_KEY_SET 0x00000400
270#define ECRYPTFS_ENCRYPT_FILENAMES 0x00000800
271#define ECRYPTFS_ENCFN_USE_MOUNT_FNEK 0x00001000
272#define ECRYPTFS_ENCFN_USE_FEK 0x00002000
Tyler Hickse77cc8d2009-04-22 04:08:46 -0500273#define ECRYPTFS_UNLINK_SIGS 0x00004000
Michael Halcrow237fead2006-10-04 02:16:22 -0700274 u32 flags;
275 unsigned int file_version;
276 size_t iv_bytes;
Tyler Hicksfa3ef1c2010-02-11 05:09:14 -0600277 size_t metadata_size;
Michael Halcrow237fead2006-10-04 02:16:22 -0700278 size_t extent_size; /* Data extent size; default is 4096 */
279 size_t key_size;
280 size_t extent_shift;
281 unsigned int extent_mask;
282 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
Michael Halcrow8bba0662006-10-30 22:07:18 -0800283 struct crypto_blkcipher *tfm;
Michael Halcrow565d97242006-10-30 22:07:17 -0800284 struct crypto_hash *hash_tfm; /* Crypto context for generating
285 * the initialization vectors */
Michael Halcrow237fead2006-10-04 02:16:22 -0700286 unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE];
287 unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
288 unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
Michael Halcrowf4aad162007-10-16 01:27:53 -0700289 struct list_head keysig_list;
290 struct mutex keysig_list_mutex;
Michael Halcrow237fead2006-10-04 02:16:22 -0700291 struct mutex cs_tfm_mutex;
Michael Halcrow565d97242006-10-30 22:07:17 -0800292 struct mutex cs_hash_tfm_mutex;
Michael Halcrow237fead2006-10-04 02:16:22 -0700293 struct mutex cs_mutex;
294};
295
296/* inode private data. */
297struct ecryptfs_inode_info {
298 struct inode vfs_inode;
299 struct inode *wii_inode;
Michael Halcrowda0102a2007-10-16 01:28:07 -0700300 struct file *lower_file;
301 struct mutex lower_file_mutex;
Michael Halcrow237fead2006-10-04 02:16:22 -0700302 struct ecryptfs_crypt_stat crypt_stat;
303};
304
305/* dentry private data. Each dentry must keep track of a lower
306 * vfsmount too. */
307struct ecryptfs_dentry_info {
Josef "Jeff" Sipekb65d34f2006-12-08 02:36:34 -0800308 struct path lower_path;
Michael Halcrow237fead2006-10-04 02:16:22 -0700309 struct ecryptfs_crypt_stat *crypt_stat;
310};
311
Michael Halcrow6c6f57f2007-10-16 01:28:01 -0700312/**
Michael Halcrow45eaab72007-10-16 01:28:05 -0700313 * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint
314 * @flags: Status flags
315 * @mount_crypt_stat_list: These auth_toks hang off the mount-wide
316 * cryptographic context. Every time a new
317 * inode comes into existence, eCryptfs copies
318 * the auth_toks on that list to the set of
319 * auth_toks on the inode's crypt_stat
320 * @global_auth_tok_key: The key from the user's keyring for the sig
321 * @global_auth_tok: The key contents
322 * @sig: The key identifier
323 *
Michael Halcrow6c6f57f2007-10-16 01:28:01 -0700324 * ecryptfs_global_auth_tok structs refer to authentication token keys
325 * in the user keyring that apply to newly created files. A list of
326 * these objects hangs off of the mount_crypt_stat struct for any
327 * given eCryptfs mount. This struct maintains a reference to both the
328 * key contents and the key itself so that the key can be put on
329 * unmount.
330 */
Michael Halcrowf4aad162007-10-16 01:27:53 -0700331struct ecryptfs_global_auth_tok {
332#define ECRYPTFS_AUTH_TOK_INVALID 0x00000001
Tyler Hicks84814d62009-03-13 13:51:59 -0700333#define ECRYPTFS_AUTH_TOK_FNEK 0x00000002
Michael Halcrowf4aad162007-10-16 01:27:53 -0700334 u32 flags;
Michael Halcrow45eaab72007-10-16 01:28:05 -0700335 struct list_head mount_crypt_stat_list;
336 struct key *global_auth_tok_key;
337 struct ecryptfs_auth_tok *global_auth_tok;
338 unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1];
Michael Halcrowf4aad162007-10-16 01:27:53 -0700339};
340
Michael Halcrow6c6f57f2007-10-16 01:28:01 -0700341/**
Michael Halcrow45eaab72007-10-16 01:28:05 -0700342 * ecryptfs_key_tfm - Persistent key tfm
343 * @key_tfm: crypto API handle to the key
344 * @key_size: Key size in bytes
345 * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is
346 * using the persistent TFM at any point in time
347 * @key_tfm_list: Handle to hang this off the module-wide TFM list
348 * @cipher_name: String name for the cipher for this TFM
349 *
Michael Halcrow6c6f57f2007-10-16 01:28:01 -0700350 * Typically, eCryptfs will use the same ciphers repeatedly throughout
351 * the course of its operations. In order to avoid unnecessarily
352 * destroying and initializing the same cipher repeatedly, eCryptfs
353 * keeps a list of crypto API contexts around to use when needed.
354 */
Michael Halcrowf4aad162007-10-16 01:27:53 -0700355struct ecryptfs_key_tfm {
356 struct crypto_blkcipher *key_tfm;
357 size_t key_size;
358 struct mutex key_tfm_mutex;
Michael Halcrow45eaab72007-10-16 01:28:05 -0700359 struct list_head key_tfm_list;
Michael Halcrowf4aad162007-10-16 01:27:53 -0700360 unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
361};
362
Eric Sandeenaf440f52008-02-06 01:38:37 -0800363extern struct mutex key_tfm_list_mutex;
364
Michael Halcrow237fead2006-10-04 02:16:22 -0700365/**
366 * This struct is to enable a mount-wide passphrase/salt combo. This
367 * is more or less a stopgap to provide similar functionality to other
368 * crypto filesystems like EncFS or CFS until full policy support is
369 * implemented in eCryptfs.
370 */
371struct ecryptfs_mount_crypt_stat {
372 /* Pointers to memory we do not own, do not free these */
373#define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001
Michael Halcrow17398952007-02-12 00:53:45 -0800374#define ECRYPTFS_XATTR_METADATA_ENABLED 0x00000002
375#define ECRYPTFS_ENCRYPTED_VIEW_ENABLED 0x00000004
Michael Halcrowf4aad162007-10-16 01:27:53 -0700376#define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED 0x00000008
Michael Halcrow9c79f342009-01-06 14:41:57 -0800377#define ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES 0x00000010
378#define ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK 0x00000020
379#define ECRYPTFS_GLOBAL_ENCFN_USE_FEK 0x00000040
Michael Halcrow237fead2006-10-04 02:16:22 -0700380 u32 flags;
Michael Halcrowf4aad162007-10-16 01:27:53 -0700381 struct list_head global_auth_tok_list;
382 struct mutex global_auth_tok_list_mutex;
383 size_t num_global_auth_toks;
Michael Halcrow237fead2006-10-04 02:16:22 -0700384 size_t global_default_cipher_key_size;
Michael Halcrow9c79f342009-01-06 14:41:57 -0800385 size_t global_default_fn_cipher_key_bytes;
Michael Halcrow237fead2006-10-04 02:16:22 -0700386 unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE
387 + 1];
Michael Halcrow9c79f342009-01-06 14:41:57 -0800388 unsigned char global_default_fn_cipher_name[
389 ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
390 char global_default_fnek_sig[ECRYPTFS_SIG_SIZE_HEX + 1];
Michael Halcrow237fead2006-10-04 02:16:22 -0700391};
392
393/* superblock private data. */
394struct ecryptfs_sb_info {
395 struct super_block *wsi_sb;
396 struct ecryptfs_mount_crypt_stat mount_crypt_stat;
Jens Axboe9df9c8b2010-04-22 12:22:04 +0200397 struct backing_dev_info bdi;
Michael Halcrow237fead2006-10-04 02:16:22 -0700398};
399
400/* file private data. */
401struct ecryptfs_file_info {
402 struct file *wfi_file;
403 struct ecryptfs_crypt_stat *crypt_stat;
404};
405
406/* auth_tok <=> encrypted_session_key mappings */
407struct ecryptfs_auth_tok_list_item {
408 unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES];
409 struct list_head list;
410 struct ecryptfs_auth_tok auth_tok;
411};
412
Michael Halcrow88b4a072007-02-12 00:53:43 -0800413struct ecryptfs_message {
Michael Halcrowf66e8832008-04-29 00:59:51 -0700414 /* Can never be greater than ecryptfs_message_buf_len */
415 /* Used to find the parent msg_ctx */
416 /* Inherits from msg_ctx->index */
Michael Halcrow88b4a072007-02-12 00:53:43 -0800417 u32 index;
418 u32 data_len;
419 u8 data[];
420};
421
422struct ecryptfs_msg_ctx {
Michael Halcrowf66e8832008-04-29 00:59:51 -0700423#define ECRYPTFS_MSG_CTX_STATE_FREE 0x01
424#define ECRYPTFS_MSG_CTX_STATE_PENDING 0x02
425#define ECRYPTFS_MSG_CTX_STATE_DONE 0x03
426#define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04
427 u8 state;
428#define ECRYPTFS_MSG_HELO 100
429#define ECRYPTFS_MSG_QUIT 101
430#define ECRYPTFS_MSG_REQUEST 102
431#define ECRYPTFS_MSG_RESPONSE 103
432 u8 type;
433 u32 index;
434 /* Counter converts to a sequence number. Each message sent
435 * out for which we expect a response has an associated
436 * sequence number. The response must have the same sequence
437 * number as the counter for the msg_stc for the message to be
438 * valid. */
439 u32 counter;
440 size_t msg_size;
Michael Halcrow88b4a072007-02-12 00:53:43 -0800441 struct ecryptfs_message *msg;
442 struct task_struct *task;
443 struct list_head node;
Michael Halcrowf66e8832008-04-29 00:59:51 -0700444 struct list_head daemon_out_list;
Michael Halcrow88b4a072007-02-12 00:53:43 -0800445 struct mutex mux;
446};
447
Michael Halcrowf66e8832008-04-29 00:59:51 -0700448struct ecryptfs_daemon;
449
450struct ecryptfs_daemon {
451#define ECRYPTFS_DAEMON_IN_READ 0x00000001
452#define ECRYPTFS_DAEMON_IN_POLL 0x00000002
453#define ECRYPTFS_DAEMON_ZOMBIE 0x00000004
454#define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008
455 u32 flags;
456 u32 num_queued_msg_ctx;
Michael Halcrow6a3fd922008-04-29 00:59:52 -0700457 struct pid *pid;
Michael Halcrowf66e8832008-04-29 00:59:51 -0700458 uid_t euid;
Michael Halcrow6a3fd922008-04-29 00:59:52 -0700459 struct user_namespace *user_ns;
Michael Halcrowf66e8832008-04-29 00:59:51 -0700460 struct task_struct *task;
461 struct mutex mux;
462 struct list_head msg_ctx_out_queue;
463 wait_queue_head_t wait;
464 struct hlist_node euid_chain;
Michael Halcrow88b4a072007-02-12 00:53:43 -0800465};
466
Michael Halcrowf66e8832008-04-29 00:59:51 -0700467extern struct mutex ecryptfs_daemon_hash_mux;
468
Tyler Hicks157f1072010-02-11 07:10:38 -0600469static inline size_t
470ecryptfs_lower_header_size(struct ecryptfs_crypt_stat *crypt_stat)
471{
472 if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
473 return 0;
Tyler Hicksfa3ef1c2010-02-11 05:09:14 -0600474 return crypt_stat->metadata_size;
Tyler Hicks157f1072010-02-11 07:10:38 -0600475}
476
Michael Halcrow237fead2006-10-04 02:16:22 -0700477static inline struct ecryptfs_file_info *
478ecryptfs_file_to_private(struct file *file)
479{
480 return (struct ecryptfs_file_info *)file->private_data;
481}
482
483static inline void
484ecryptfs_set_file_private(struct file *file,
485 struct ecryptfs_file_info *file_info)
486{
487 file->private_data = file_info;
488}
489
490static inline struct file *ecryptfs_file_to_lower(struct file *file)
491{
492 return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;
493}
494
495static inline void
496ecryptfs_set_file_lower(struct file *file, struct file *lower_file)
497{
498 ((struct ecryptfs_file_info *)file->private_data)->wfi_file =
499 lower_file;
500}
501
502static inline struct ecryptfs_inode_info *
503ecryptfs_inode_to_private(struct inode *inode)
504{
505 return container_of(inode, struct ecryptfs_inode_info, vfs_inode);
506}
507
508static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode)
509{
510 return ecryptfs_inode_to_private(inode)->wii_inode;
511}
512
513static inline void
514ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode)
515{
516 ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;
517}
518
519static inline struct ecryptfs_sb_info *
520ecryptfs_superblock_to_private(struct super_block *sb)
521{
522 return (struct ecryptfs_sb_info *)sb->s_fs_info;
523}
524
525static inline void
526ecryptfs_set_superblock_private(struct super_block *sb,
527 struct ecryptfs_sb_info *sb_info)
528{
529 sb->s_fs_info = sb_info;
530}
531
532static inline struct super_block *
533ecryptfs_superblock_to_lower(struct super_block *sb)
534{
535 return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;
536}
537
538static inline void
539ecryptfs_set_superblock_lower(struct super_block *sb,
540 struct super_block *lower_sb)
541{
542 ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb;
543}
544
545static inline struct ecryptfs_dentry_info *
546ecryptfs_dentry_to_private(struct dentry *dentry)
547{
548 return (struct ecryptfs_dentry_info *)dentry->d_fsdata;
549}
550
551static inline void
552ecryptfs_set_dentry_private(struct dentry *dentry,
553 struct ecryptfs_dentry_info *dentry_info)
554{
555 dentry->d_fsdata = dentry_info;
556}
557
558static inline struct dentry *
559ecryptfs_dentry_to_lower(struct dentry *dentry)
560{
Josef "Jeff" Sipekb65d34f2006-12-08 02:36:34 -0800561 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
Michael Halcrow237fead2006-10-04 02:16:22 -0700562}
563
564static inline void
565ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry)
566{
Josef "Jeff" Sipekb65d34f2006-12-08 02:36:34 -0800567 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry =
Michael Halcrow237fead2006-10-04 02:16:22 -0700568 lower_dentry;
569}
570
571static inline struct vfsmount *
572ecryptfs_dentry_to_lower_mnt(struct dentry *dentry)
573{
Josef "Jeff" Sipekb65d34f2006-12-08 02:36:34 -0800574 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;
Michael Halcrow237fead2006-10-04 02:16:22 -0700575}
576
577static inline void
578ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt)
579{
Josef "Jeff" Sipekb65d34f2006-12-08 02:36:34 -0800580 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt =
Michael Halcrow237fead2006-10-04 02:16:22 -0700581 lower_mnt;
582}
583
584#define ecryptfs_printk(type, fmt, arg...) \
Harvey Harrison18d1dbf2008-04-29 00:59:48 -0700585 __ecryptfs_printk(type "%s: " fmt, __func__, ## arg);
Michael Halcrow237fead2006-10-04 02:16:22 -0700586void __ecryptfs_printk(const char *fmt, ...);
587
588extern const struct file_operations ecryptfs_main_fops;
589extern const struct file_operations ecryptfs_dir_fops;
Arjan van de Ven754661f2007-02-12 00:55:38 -0800590extern const struct inode_operations ecryptfs_main_iops;
591extern const struct inode_operations ecryptfs_dir_iops;
592extern const struct inode_operations ecryptfs_symlink_iops;
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800593extern const struct super_operations ecryptfs_sops;
Al Viro5a3fd052009-02-20 05:57:52 +0000594extern const struct dentry_operations ecryptfs_dops;
Alexey Dobriyan7f094102009-09-21 17:01:10 -0700595extern const struct address_space_operations ecryptfs_aops;
Michael Halcrow237fead2006-10-04 02:16:22 -0700596extern int ecryptfs_verbosity;
Michael Halcrow88b4a072007-02-12 00:53:43 -0800597extern unsigned int ecryptfs_message_buf_len;
598extern signed long ecryptfs_message_wait_timeout;
599extern unsigned int ecryptfs_number_of_users;
Michael Halcrow237fead2006-10-04 02:16:22 -0700600
601extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;
602extern struct kmem_cache *ecryptfs_file_info_cache;
603extern struct kmem_cache *ecryptfs_dentry_info_cache;
604extern struct kmem_cache *ecryptfs_inode_info_cache;
605extern struct kmem_cache *ecryptfs_sb_info_cache;
Michael Halcrow237fead2006-10-04 02:16:22 -0700606extern struct kmem_cache *ecryptfs_header_cache_1;
607extern struct kmem_cache *ecryptfs_header_cache_2;
Michael Halcrowdd2a3b72007-02-12 00:53:46 -0800608extern struct kmem_cache *ecryptfs_xattr_cache;
Michael Halcroweb95e7f2007-02-16 01:28:40 -0800609extern struct kmem_cache *ecryptfs_key_record_cache;
Michael Halcrowf4aad162007-10-16 01:27:53 -0700610extern struct kmem_cache *ecryptfs_key_sig_cache;
611extern struct kmem_cache *ecryptfs_global_auth_tok_cache;
612extern struct kmem_cache *ecryptfs_key_tfm_cache;
Michael Halcrow746f1e52008-07-23 21:30:02 -0700613extern struct kmem_cache *ecryptfs_open_req_cache;
614
615struct ecryptfs_open_req {
616#define ECRYPTFS_REQ_PROCESSED 0x00000001
617#define ECRYPTFS_REQ_DROPPED 0x00000002
618#define ECRYPTFS_REQ_ZOMBIE 0x00000004
619 u32 flags;
620 struct file **lower_file;
621 struct dentry *lower_dentry;
622 struct vfsmount *lower_mnt;
623 wait_queue_head_t wait;
624 struct mutex mux;
625 struct list_head kthread_ctl_list;
626};
Michael Halcrow237fead2006-10-04 02:16:22 -0700627
Michael Halcrow72b55ff2008-07-23 21:30:07 -0700628#define ECRYPTFS_INTERPOSE_FLAG_D_ADD 0x00000001
Michael Halcrow237fead2006-10-04 02:16:22 -0700629int ecryptfs_interpose(struct dentry *hidden_dentry,
630 struct dentry *this_dentry, struct super_block *sb,
Michael Halcrow72b55ff2008-07-23 21:30:07 -0700631 u32 flags);
Michael Halcrowa34f60f2009-01-06 14:41:58 -0800632int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
633 struct dentry *lower_dentry,
Michael Halcrowa34f60f2009-01-06 14:41:58 -0800634 struct inode *ecryptfs_dir_inode,
635 struct nameidata *ecryptfs_nd);
636int ecryptfs_decode_and_decrypt_filename(char **decrypted_name,
637 size_t *decrypted_name_size,
638 struct dentry *ecryptfs_dentry,
639 const char *name, size_t name_size);
Michael Halcrow237fead2006-10-04 02:16:22 -0700640int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
Michael Halcrowa34f60f2009-01-06 14:41:58 -0800641int ecryptfs_encrypt_and_encode_filename(
642 char **encoded_name,
643 size_t *encoded_name_size,
644 struct ecryptfs_crypt_stat *crypt_stat,
645 struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
646 const char *name, size_t name_size);
Michael Halcrow237fead2006-10-04 02:16:22 -0700647struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);
Michael Halcrow237fead2006-10-04 02:16:22 -0700648void ecryptfs_dump_hex(char *data, int bytes);
649int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
650 int sg_size);
651int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);
652void ecryptfs_rotate_iv(unsigned char *iv);
653void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
Michael Halcrowfcd12832007-10-16 01:28:01 -0700654void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
655void ecryptfs_destroy_mount_crypt_stat(
Michael Halcrow237fead2006-10-04 02:16:22 -0700656 struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
657int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
Michael Halcrowb6c1d8f2007-10-16 01:28:13 -0700658int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode);
Michael Halcrow0216f7f2007-10-16 01:28:08 -0700659int ecryptfs_encrypt_page(struct page *page);
660int ecryptfs_decrypt_page(struct page *page);
Michael Halcrowd7cdc5f2007-10-16 01:28:10 -0700661int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry);
662int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry);
Michael Halcrow237fead2006-10-04 02:16:22 -0700663int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry);
Tyler Hicksf4e60e62010-02-11 00:02:32 -0600664void ecryptfs_write_crypt_stat_flags(char *page_virt,
665 struct ecryptfs_crypt_stat *crypt_stat,
666 size_t *written);
Michael Halcrowd7cdc5f2007-10-16 01:28:10 -0700667int ecryptfs_read_and_validate_header_region(char *data,
668 struct inode *ecryptfs_inode);
Michael Halcrowdd2a3b72007-02-12 00:53:46 -0800669int ecryptfs_read_and_validate_xattr_region(char *page_virt,
670 struct dentry *ecryptfs_dentry);
Michael Halcrow9c79f342009-01-06 14:41:57 -0800671u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes);
Trevor Highland19e66a62008-02-06 01:38:36 -0800672int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code);
Michael Halcrow237fead2006-10-04 02:16:22 -0700673void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
674int ecryptfs_generate_key_packet_set(char *dest_base,
675 struct ecryptfs_crypt_stat *crypt_stat,
676 struct dentry *ecryptfs_dentry,
677 size_t *len, size_t max);
Michael Halcrow237fead2006-10-04 02:16:22 -0700678int
679ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
680 unsigned char *src, struct dentry *ecryptfs_dentry);
681int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
Michael Halcrow237fead2006-10-04 02:16:22 -0700682int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode);
683int ecryptfs_inode_set(struct inode *inode, void *lower_inode);
684void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode);
Michael Halcrowd7cdc5f2007-10-16 01:28:10 -0700685ssize_t
686ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
687 void *value, size_t size);
Michael Halcrowdd2a3b72007-02-12 00:53:46 -0800688int
689ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
690 size_t size, int flags);
Michael Halcrowd7cdc5f2007-10-16 01:28:10 -0700691int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode);
Tyler Hicks624ae522008-10-15 22:02:51 -0700692int ecryptfs_process_helo(uid_t euid, struct user_namespace *user_ns,
693 struct pid *pid);
Michael Halcrow6a3fd922008-04-29 00:59:52 -0700694int ecryptfs_process_quit(uid_t euid, struct user_namespace *user_ns,
695 struct pid *pid);
696int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
697 struct user_namespace *user_ns, struct pid *pid,
698 u32 seq);
Tyler Hicks624ae522008-10-15 22:02:51 -0700699int ecryptfs_send_message(char *data, int data_len,
Michael Halcrow88b4a072007-02-12 00:53:43 -0800700 struct ecryptfs_msg_ctx **msg_ctx);
701int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
702 struct ecryptfs_message **emsg);
Tyler Hicks624ae522008-10-15 22:02:51 -0700703int ecryptfs_init_messaging(void);
704void ecryptfs_release_messaging(void);
Michael Halcrow88b4a072007-02-12 00:53:43 -0800705
Michael Halcrowe77a56d2007-02-12 00:53:47 -0800706void
707ecryptfs_write_header_metadata(char *virt,
708 struct ecryptfs_crypt_stat *crypt_stat,
709 size_t *written);
Michael Halcrowf4aad162007-10-16 01:27:53 -0700710int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig);
711int
712ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
Tyler Hicks84814d62009-03-13 13:51:59 -0700713 char *sig, u32 global_auth_tok_flags);
Michael Halcrowf4aad162007-10-16 01:27:53 -0700714int ecryptfs_get_global_auth_tok_for_sig(
715 struct ecryptfs_global_auth_tok **global_auth_tok,
716 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig);
717int
718ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
719 size_t key_size);
720int ecryptfs_init_crypto(void);
Michael Halcrowfcd12832007-10-16 01:28:01 -0700721int ecryptfs_destroy_crypto(void);
Eric Sandeenaf440f52008-02-06 01:38:37 -0800722int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm);
Michael Halcrowf4aad162007-10-16 01:27:53 -0700723int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
724 struct mutex **tfm_mutex,
725 char *cipher_name);
726int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
727 struct ecryptfs_auth_tok **auth_tok,
728 char *sig);
Michael Halcrowda0102a2007-10-16 01:28:07 -0700729int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
730 loff_t offset, size_t size);
731int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
732 struct page *page_for_lower,
733 size_t offset_in_page, size_t size);
Al Viro48c1e442010-05-21 11:09:58 -0400734int ecryptfs_write(struct inode *inode, char *data, loff_t offset, size_t size);
Michael Halcrowda0102a2007-10-16 01:28:07 -0700735int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
736 struct inode *ecryptfs_inode);
737int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
738 pgoff_t page_index,
739 size_t offset_in_page, size_t size,
740 struct inode *ecryptfs_inode);
Al Viro02bd9792010-05-21 11:02:14 -0400741struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index);
Michael Halcrowf66e8832008-04-29 00:59:51 -0700742int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon);
Michael Halcrow6a3fd922008-04-29 00:59:52 -0700743int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon, uid_t euid,
744 struct user_namespace *user_ns);
Michael Halcrowf66e8832008-04-29 00:59:51 -0700745int ecryptfs_parse_packet_length(unsigned char *data, size_t *size,
746 size_t *length_size);
747int ecryptfs_write_packet_length(char *dest, size_t size,
748 size_t *packet_size_length);
749int ecryptfs_init_ecryptfs_miscdev(void);
750void ecryptfs_destroy_ecryptfs_miscdev(void);
751int ecryptfs_send_miscdev(char *data, size_t data_size,
752 struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
753 u16 msg_flags, struct ecryptfs_daemon *daemon);
754void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx);
755int
Michael Halcrow6a3fd922008-04-29 00:59:52 -0700756ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, uid_t euid,
757 struct user_namespace *user_ns, struct pid *pid);
Michael Halcrow746f1e52008-07-23 21:30:02 -0700758int ecryptfs_init_kthread(void);
759void ecryptfs_destroy_kthread(void);
760int ecryptfs_privileged_open(struct file **lower_file,
761 struct dentry *lower_dentry,
David Howells745ca242008-11-14 10:39:22 +1100762 struct vfsmount *lower_mnt,
763 const struct cred *cred);
Michael Halcrow72b55ff2008-07-23 21:30:07 -0700764int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry);
Michael Halcrow9c79f342009-01-06 14:41:57 -0800765int
766ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
767 size_t *packet_size,
768 struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
769 char *filename, size_t filename_size);
770int
771ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
772 size_t *packet_size,
773 struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
774 char *data, size_t max_packet_size);
Michael Halcrowa34f60f2009-01-06 14:41:58 -0800775int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat,
776 loff_t offset);
Michael Halcrow88b4a072007-02-12 00:53:43 -0800777
Michael Halcrow237fead2006-10-04 02:16:22 -0700778#endif /* #ifndef ECRYPTFS_KERNEL_H */