2 * eCryptfs: Linux filesystem encryption layer
5 * Copyright (C) 1997-2003 Erez Zadok
6 * Copyright (C) 2001-2003 Stony Brook University
7 * Copyright (C) 2004-2008 International Business Machines Corp.
8 * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
9 * Trevor S. Highland <trevor.highland@gmail.com>
10 * Tyler Hicks <tyhicks@ou.edu>
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.
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.
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
28 #ifndef ECRYPTFS_KERNEL_H
29 #define ECRYPTFS_KERNEL_H
31 #include <keys/user-type.h>
32 #include <keys/encrypted-type.h>
34 #include <linux/fs_stack.h>
35 #include <linux/namei.h>
36 #include <linux/scatterlist.h>
37 #include <linux/hash.h>
38 #include <linux/nsproxy.h>
39 #include <linux/backing-dev.h>
40 #include <linux/ecryptfs.h>
42 #define ECRYPTFS_DEFAULT_IV_BYTES 16
43 #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096
44 #define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192
45 #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32
46 #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ
47 #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3)
48 #define ECRYPTFS_DEFAULT_NUM_USERS 4
49 #define ECRYPTFS_MAX_NUM_USERS 32768
50 #define ECRYPTFS_XATTR_NAME "user.ecryptfs"
52 void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);
53 extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size);
54 extern void ecryptfs_from_hex(char *dst, char *src, int dst_size);
56 struct ecryptfs_key_record {
59 unsigned char sig[ECRYPTFS_SIG_SIZE];
60 unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
63 struct ecryptfs_auth_tok_list {
64 struct ecryptfs_auth_tok *auth_tok;
65 struct list_head list;
68 struct ecryptfs_crypt_stat;
69 struct ecryptfs_mount_crypt_stat;
71 struct ecryptfs_page_crypt_context {
73 #define ECRYPTFS_PREPARE_COMMIT_MODE 0
74 #define ECRYPTFS_WRITEPAGE_MODE 1
77 struct file *lower_file;
78 struct writeback_control *wbc;
82 #if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
83 static inline struct ecryptfs_auth_tok *
84 ecryptfs_get_encrypted_key_payload_data(struct key *key)
86 struct encrypted_key_payload *payload;
88 if (key->type != &key_type_encrypted)
91 payload = key->payload.data;
93 return ERR_PTR(-EKEYREVOKED);
95 return (struct ecryptfs_auth_tok *)payload->payload_data;
98 static inline struct key *ecryptfs_get_encrypted_key(char *sig)
100 return request_key(&key_type_encrypted, sig, NULL);
104 static inline struct ecryptfs_auth_tok *
105 ecryptfs_get_encrypted_key_payload_data(struct key *key)
110 static inline struct key *ecryptfs_get_encrypted_key(char *sig)
112 return ERR_PTR(-ENOKEY);
115 #endif /* CONFIG_ENCRYPTED_KEYS */
117 static inline struct ecryptfs_auth_tok *
118 ecryptfs_get_key_payload_data(struct key *key)
120 struct ecryptfs_auth_tok *auth_tok;
121 struct user_key_payload *ukp;
123 auth_tok = ecryptfs_get_encrypted_key_payload_data(key);
127 ukp = key->payload.data;
129 return ERR_PTR(-EKEYREVOKED);
131 return (struct ecryptfs_auth_tok *)ukp->data;
134 #define ECRYPTFS_MAX_KEYSET_SIZE 1024
135 #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32
136 #define ECRYPTFS_MAX_NUM_ENC_KEYS 64
137 #define ECRYPTFS_MAX_IV_BYTES 16 /* 128 bits */
138 #define ECRYPTFS_SALT_BYTES 2
139 #define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5
140 #define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8 /* 4*2 */
141 #define ECRYPTFS_FILE_SIZE_BYTES (sizeof(u64))
142 #define ECRYPTFS_SIZE_AND_MARKER_BYTES (ECRYPTFS_FILE_SIZE_BYTES \
143 + MAGIC_ECRYPTFS_MARKER_SIZE_BYTES)
144 #define ECRYPTFS_DEFAULT_CIPHER "aes"
145 #define ECRYPTFS_DEFAULT_KEY_BYTES 16
146 #define ECRYPTFS_DEFAULT_HASH "md5"
147 #define ECRYPTFS_TAG_70_DIGEST ECRYPTFS_DEFAULT_HASH
148 #define ECRYPTFS_TAG_1_PACKET_TYPE 0x01
149 #define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C
150 #define ECRYPTFS_TAG_11_PACKET_TYPE 0xED
151 #define ECRYPTFS_TAG_64_PACKET_TYPE 0x40
152 #define ECRYPTFS_TAG_65_PACKET_TYPE 0x41
153 #define ECRYPTFS_TAG_66_PACKET_TYPE 0x42
154 #define ECRYPTFS_TAG_67_PACKET_TYPE 0x43
155 #define ECRYPTFS_TAG_70_PACKET_TYPE 0x46 /* FNEK-encrypted filename
157 #define ECRYPTFS_TAG_71_PACKET_TYPE 0x47 /* FNEK-encrypted filename in
159 #define ECRYPTFS_TAG_72_PACKET_TYPE 0x48 /* FEK-encrypted filename as
161 #define ECRYPTFS_TAG_73_PACKET_TYPE 0x49 /* FEK-encrypted filename as
163 #define ECRYPTFS_MIN_PKT_LEN_SIZE 1 /* Min size to specify packet length */
164 #define ECRYPTFS_MAX_PKT_LEN_SIZE 2 /* Pass at least this many bytes to
165 * ecryptfs_parse_packet_length() and
166 * ecryptfs_write_packet_length()
168 /* Constraint: ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES >=
169 * ECRYPTFS_MAX_IV_BYTES */
170 #define ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES 16
171 #define ECRYPTFS_NON_NULL 0x42 /* A reasonable substitute for NULL */
172 #define MD5_DIGEST_SIZE 16
173 #define ECRYPTFS_TAG_70_DIGEST_SIZE MD5_DIGEST_SIZE
174 #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FEK_ENCRYPTED."
175 #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX_SIZE 23
176 #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FNEK_ENCRYPTED."
177 #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE 24
178 #define ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN (18 + 1 + 4 + 1 + 32)
180 struct ecryptfs_key_sig {
181 struct list_head crypt_stat_list;
182 char keysig[ECRYPTFS_SIG_SIZE_HEX + 1];
185 struct ecryptfs_filename {
186 struct list_head crypt_stat_list;
187 #define ECRYPTFS_FILENAME_CONTAINS_DECRYPTED 0x00000001
191 char *encrypted_filename;
192 size_t filename_size;
193 size_t encrypted_filename_size;
194 char fnek_sig[ECRYPTFS_SIG_SIZE_HEX];
195 char dentry_name[ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN + 1];
199 * This is the primary struct associated with each encrypted file.
201 * TODO: cache align/pack?
203 struct ecryptfs_crypt_stat {
204 #define ECRYPTFS_STRUCT_INITIALIZED 0x00000001
205 #define ECRYPTFS_POLICY_APPLIED 0x00000002
206 #define ECRYPTFS_ENCRYPTED 0x00000004
207 #define ECRYPTFS_SECURITY_WARNING 0x00000008
208 #define ECRYPTFS_ENABLE_HMAC 0x00000010
209 #define ECRYPTFS_ENCRYPT_IV_PAGES 0x00000020
210 #define ECRYPTFS_KEY_VALID 0x00000040
211 #define ECRYPTFS_METADATA_IN_XATTR 0x00000080
212 #define ECRYPTFS_VIEW_AS_ENCRYPTED 0x00000100
213 #define ECRYPTFS_KEY_SET 0x00000200
214 #define ECRYPTFS_ENCRYPT_FILENAMES 0x00000400
215 #define ECRYPTFS_ENCFN_USE_MOUNT_FNEK 0x00000800
216 #define ECRYPTFS_ENCFN_USE_FEK 0x00001000
217 #define ECRYPTFS_UNLINK_SIGS 0x00002000
218 #define ECRYPTFS_I_SIZE_INITIALIZED 0x00004000
220 unsigned int file_version;
222 size_t metadata_size;
223 size_t extent_size; /* Data extent size; default is 4096 */
226 unsigned int extent_mask;
227 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
228 struct crypto_blkcipher *tfm;
229 struct crypto_hash *hash_tfm; /* Crypto context for generating
230 * the initialization vectors */
231 unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE];
232 unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
233 unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
234 struct list_head keysig_list;
235 struct mutex keysig_list_mutex;
236 struct mutex cs_tfm_mutex;
237 struct mutex cs_hash_tfm_mutex;
238 struct mutex cs_mutex;
241 /* inode private data. */
242 struct ecryptfs_inode_info {
243 struct inode vfs_inode;
244 struct inode *wii_inode;
245 struct mutex lower_file_mutex;
246 atomic_t lower_file_count;
247 struct file *lower_file;
248 struct ecryptfs_crypt_stat crypt_stat;
251 /* dentry private data. Each dentry must keep track of a lower
253 struct ecryptfs_dentry_info {
254 struct path lower_path;
255 struct ecryptfs_crypt_stat *crypt_stat;
259 * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint
260 * @flags: Status flags
261 * @mount_crypt_stat_list: These auth_toks hang off the mount-wide
262 * cryptographic context. Every time a new
263 * inode comes into existence, eCryptfs copies
264 * the auth_toks on that list to the set of
265 * auth_toks on the inode's crypt_stat
266 * @global_auth_tok_key: The key from the user's keyring for the sig
267 * @global_auth_tok: The key contents
268 * @sig: The key identifier
270 * ecryptfs_global_auth_tok structs refer to authentication token keys
271 * in the user keyring that apply to newly created files. A list of
272 * these objects hangs off of the mount_crypt_stat struct for any
273 * given eCryptfs mount. This struct maintains a reference to both the
274 * key contents and the key itself so that the key can be put on
277 struct ecryptfs_global_auth_tok {
278 #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001
279 #define ECRYPTFS_AUTH_TOK_FNEK 0x00000002
281 struct list_head mount_crypt_stat_list;
282 struct key *global_auth_tok_key;
283 unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1];
287 * ecryptfs_key_tfm - Persistent key tfm
288 * @key_tfm: crypto API handle to the key
289 * @key_size: Key size in bytes
290 * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is
291 * using the persistent TFM at any point in time
292 * @key_tfm_list: Handle to hang this off the module-wide TFM list
293 * @cipher_name: String name for the cipher for this TFM
295 * Typically, eCryptfs will use the same ciphers repeatedly throughout
296 * the course of its operations. In order to avoid unnecessarily
297 * destroying and initializing the same cipher repeatedly, eCryptfs
298 * keeps a list of crypto API contexts around to use when needed.
300 struct ecryptfs_key_tfm {
301 struct crypto_blkcipher *key_tfm;
303 struct mutex key_tfm_mutex;
304 struct list_head key_tfm_list;
305 unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
308 extern struct mutex key_tfm_list_mutex;
311 * This struct is to enable a mount-wide passphrase/salt combo. This
312 * is more or less a stopgap to provide similar functionality to other
313 * crypto filesystems like EncFS or CFS until full policy support is
314 * implemented in eCryptfs.
316 struct ecryptfs_mount_crypt_stat {
317 /* Pointers to memory we do not own, do not free these */
318 #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001
319 #define ECRYPTFS_XATTR_METADATA_ENABLED 0x00000002
320 #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED 0x00000004
321 #define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED 0x00000008
322 #define ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES 0x00000010
323 #define ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK 0x00000020
324 #define ECRYPTFS_GLOBAL_ENCFN_USE_FEK 0x00000040
325 #define ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY 0x00000080
327 struct list_head global_auth_tok_list;
328 struct mutex global_auth_tok_list_mutex;
329 size_t global_default_cipher_key_size;
330 size_t global_default_fn_cipher_key_bytes;
331 unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE
333 unsigned char global_default_fn_cipher_name[
334 ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
335 char global_default_fnek_sig[ECRYPTFS_SIG_SIZE_HEX + 1];
338 /* superblock private data. */
339 struct ecryptfs_sb_info {
340 struct super_block *wsi_sb;
341 struct ecryptfs_mount_crypt_stat mount_crypt_stat;
342 struct backing_dev_info bdi;
345 /* file private data. */
346 struct ecryptfs_file_info {
347 struct file *wfi_file;
348 struct ecryptfs_crypt_stat *crypt_stat;
351 /* auth_tok <=> encrypted_session_key mappings */
352 struct ecryptfs_auth_tok_list_item {
353 unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES];
354 struct list_head list;
355 struct ecryptfs_auth_tok auth_tok;
358 struct ecryptfs_message {
359 /* Can never be greater than ecryptfs_message_buf_len */
360 /* Used to find the parent msg_ctx */
361 /* Inherits from msg_ctx->index */
367 struct ecryptfs_msg_ctx {
368 #define ECRYPTFS_MSG_CTX_STATE_FREE 0x01
369 #define ECRYPTFS_MSG_CTX_STATE_PENDING 0x02
370 #define ECRYPTFS_MSG_CTX_STATE_DONE 0x03
371 #define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04
373 #define ECRYPTFS_MSG_HELO 100
374 #define ECRYPTFS_MSG_QUIT 101
375 #define ECRYPTFS_MSG_REQUEST 102
376 #define ECRYPTFS_MSG_RESPONSE 103
379 /* Counter converts to a sequence number. Each message sent
380 * out for which we expect a response has an associated
381 * sequence number. The response must have the same sequence
382 * number as the counter for the msg_stc for the message to be
386 struct ecryptfs_message *msg;
387 struct task_struct *task;
388 struct list_head node;
389 struct list_head daemon_out_list;
393 struct ecryptfs_daemon;
395 struct ecryptfs_daemon {
396 #define ECRYPTFS_DAEMON_IN_READ 0x00000001
397 #define ECRYPTFS_DAEMON_IN_POLL 0x00000002
398 #define ECRYPTFS_DAEMON_ZOMBIE 0x00000004
399 #define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008
401 u32 num_queued_msg_ctx;
404 struct user_namespace *user_ns;
405 struct task_struct *task;
407 struct list_head msg_ctx_out_queue;
408 wait_queue_head_t wait;
409 struct hlist_node euid_chain;
412 extern struct mutex ecryptfs_daemon_hash_mux;
415 ecryptfs_lower_header_size(struct ecryptfs_crypt_stat *crypt_stat)
417 if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
419 return crypt_stat->metadata_size;
422 static inline struct ecryptfs_file_info *
423 ecryptfs_file_to_private(struct file *file)
425 return file->private_data;
429 ecryptfs_set_file_private(struct file *file,
430 struct ecryptfs_file_info *file_info)
432 file->private_data = file_info;
435 static inline struct file *ecryptfs_file_to_lower(struct file *file)
437 return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;
441 ecryptfs_set_file_lower(struct file *file, struct file *lower_file)
443 ((struct ecryptfs_file_info *)file->private_data)->wfi_file =
447 static inline struct ecryptfs_inode_info *
448 ecryptfs_inode_to_private(struct inode *inode)
450 return container_of(inode, struct ecryptfs_inode_info, vfs_inode);
453 static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode)
455 return ecryptfs_inode_to_private(inode)->wii_inode;
459 ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode)
461 ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;
464 static inline struct ecryptfs_sb_info *
465 ecryptfs_superblock_to_private(struct super_block *sb)
467 return (struct ecryptfs_sb_info *)sb->s_fs_info;
471 ecryptfs_set_superblock_private(struct super_block *sb,
472 struct ecryptfs_sb_info *sb_info)
474 sb->s_fs_info = sb_info;
477 static inline struct super_block *
478 ecryptfs_superblock_to_lower(struct super_block *sb)
480 return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;
484 ecryptfs_set_superblock_lower(struct super_block *sb,
485 struct super_block *lower_sb)
487 ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb;
490 static inline struct ecryptfs_dentry_info *
491 ecryptfs_dentry_to_private(struct dentry *dentry)
493 return (struct ecryptfs_dentry_info *)dentry->d_fsdata;
497 ecryptfs_set_dentry_private(struct dentry *dentry,
498 struct ecryptfs_dentry_info *dentry_info)
500 dentry->d_fsdata = dentry_info;
503 static inline struct dentry *
504 ecryptfs_dentry_to_lower(struct dentry *dentry)
506 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
510 ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry)
512 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry =
516 static inline struct vfsmount *
517 ecryptfs_dentry_to_lower_mnt(struct dentry *dentry)
519 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;
523 ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt)
525 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt =
529 #define ecryptfs_printk(type, fmt, arg...) \
530 __ecryptfs_printk(type "%s: " fmt, __func__, ## arg);
532 void __ecryptfs_printk(const char *fmt, ...);
534 extern const struct file_operations ecryptfs_main_fops;
535 extern const struct file_operations ecryptfs_dir_fops;
536 extern const struct inode_operations ecryptfs_main_iops;
537 extern const struct inode_operations ecryptfs_dir_iops;
538 extern const struct inode_operations ecryptfs_symlink_iops;
539 extern const struct super_operations ecryptfs_sops;
540 extern const struct dentry_operations ecryptfs_dops;
541 extern const struct address_space_operations ecryptfs_aops;
542 extern int ecryptfs_verbosity;
543 extern unsigned int ecryptfs_message_buf_len;
544 extern signed long ecryptfs_message_wait_timeout;
545 extern unsigned int ecryptfs_number_of_users;
547 extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;
548 extern struct kmem_cache *ecryptfs_file_info_cache;
549 extern struct kmem_cache *ecryptfs_dentry_info_cache;
550 extern struct kmem_cache *ecryptfs_inode_info_cache;
551 extern struct kmem_cache *ecryptfs_sb_info_cache;
552 extern struct kmem_cache *ecryptfs_header_cache;
553 extern struct kmem_cache *ecryptfs_xattr_cache;
554 extern struct kmem_cache *ecryptfs_key_record_cache;
555 extern struct kmem_cache *ecryptfs_key_sig_cache;
556 extern struct kmem_cache *ecryptfs_global_auth_tok_cache;
557 extern struct kmem_cache *ecryptfs_key_tfm_cache;
558 extern struct kmem_cache *ecryptfs_open_req_cache;
560 struct ecryptfs_open_req {
561 #define ECRYPTFS_REQ_PROCESSED 0x00000001
562 #define ECRYPTFS_REQ_DROPPED 0x00000002
563 #define ECRYPTFS_REQ_ZOMBIE 0x00000004
565 struct file **lower_file;
566 struct dentry *lower_dentry;
567 struct vfsmount *lower_mnt;
568 wait_queue_head_t wait;
570 struct list_head kthread_ctl_list;
573 struct inode *ecryptfs_get_inode(struct inode *lower_inode,
574 struct super_block *sb);
575 void ecryptfs_i_size_init(const char *page_virt, struct inode *inode);
576 int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
577 struct inode *ecryptfs_inode);
578 int ecryptfs_decode_and_decrypt_filename(char **decrypted_name,
579 size_t *decrypted_name_size,
580 struct dentry *ecryptfs_dentry,
581 const char *name, size_t name_size);
582 int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
583 int ecryptfs_encrypt_and_encode_filename(
585 size_t *encoded_name_size,
586 struct ecryptfs_crypt_stat *crypt_stat,
587 struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
588 const char *name, size_t name_size);
589 struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);
590 void ecryptfs_dump_hex(char *data, int bytes);
591 int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
593 int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);
594 void ecryptfs_rotate_iv(unsigned char *iv);
595 void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
596 void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
597 void ecryptfs_destroy_mount_crypt_stat(
598 struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
599 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
600 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode);
601 int ecryptfs_encrypt_page(struct page *page);
602 int ecryptfs_decrypt_page(struct page *page);
603 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry,
604 struct inode *ecryptfs_inode);
605 int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry);
606 int ecryptfs_new_file_context(struct inode *ecryptfs_inode);
607 void ecryptfs_write_crypt_stat_flags(char *page_virt,
608 struct ecryptfs_crypt_stat *crypt_stat,
610 int ecryptfs_read_and_validate_header_region(struct inode *inode);
611 int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry,
612 struct inode *inode);
613 u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes);
614 int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code);
615 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
616 int ecryptfs_generate_key_packet_set(char *dest_base,
617 struct ecryptfs_crypt_stat *crypt_stat,
618 struct dentry *ecryptfs_dentry,
619 size_t *len, size_t max);
621 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
622 unsigned char *src, struct dentry *ecryptfs_dentry);
623 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
625 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
626 void *value, size_t size);
628 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
629 size_t size, int flags);
630 int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode);
631 int ecryptfs_process_helo(uid_t euid, struct user_namespace *user_ns,
633 int ecryptfs_process_quit(uid_t euid, struct user_namespace *user_ns,
635 int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
636 struct user_namespace *user_ns, struct pid *pid,
638 int ecryptfs_send_message(char *data, int data_len,
639 struct ecryptfs_msg_ctx **msg_ctx);
640 int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
641 struct ecryptfs_message **emsg);
642 int ecryptfs_init_messaging(void);
643 void ecryptfs_release_messaging(void);
646 ecryptfs_write_header_metadata(char *virt,
647 struct ecryptfs_crypt_stat *crypt_stat,
649 int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig);
651 ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
652 char *sig, u32 global_auth_tok_flags);
653 int ecryptfs_get_global_auth_tok_for_sig(
654 struct ecryptfs_global_auth_tok **global_auth_tok,
655 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig);
657 ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
659 int ecryptfs_init_crypto(void);
660 int ecryptfs_destroy_crypto(void);
661 int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm);
662 int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
663 struct mutex **tfm_mutex,
665 int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
666 struct ecryptfs_auth_tok **auth_tok,
668 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
669 loff_t offset, size_t size);
670 int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
671 struct page *page_for_lower,
672 size_t offset_in_page, size_t size);
673 int ecryptfs_write(struct inode *inode, char *data, loff_t offset, size_t size);
674 int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
675 struct inode *ecryptfs_inode);
676 int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
678 size_t offset_in_page, size_t size,
679 struct inode *ecryptfs_inode);
680 struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index);
681 int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon);
682 int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon, uid_t euid,
683 struct user_namespace *user_ns);
684 int ecryptfs_parse_packet_length(unsigned char *data, size_t *size,
685 size_t *length_size);
686 int ecryptfs_write_packet_length(char *dest, size_t size,
687 size_t *packet_size_length);
688 int ecryptfs_init_ecryptfs_miscdev(void);
689 void ecryptfs_destroy_ecryptfs_miscdev(void);
690 int ecryptfs_send_miscdev(char *data, size_t data_size,
691 struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
692 u16 msg_flags, struct ecryptfs_daemon *daemon);
693 void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx);
695 ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, uid_t euid,
696 struct user_namespace *user_ns, struct pid *pid);
697 int ecryptfs_init_kthread(void);
698 void ecryptfs_destroy_kthread(void);
699 int ecryptfs_privileged_open(struct file **lower_file,
700 struct dentry *lower_dentry,
701 struct vfsmount *lower_mnt,
702 const struct cred *cred);
703 int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode);
704 void ecryptfs_put_lower_file(struct inode *inode);
706 ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
708 struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
709 char *filename, size_t filename_size);
711 ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
713 struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
714 char *data, size_t max_packet_size);
715 int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat,
718 #endif /* #ifndef ECRYPTFS_KERNEL_H */