1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
2 | /** |
3 | * eCryptfs: Linux filesystem encryption layer |
4 | * Kernel declarations. |
5 | * |
6 | * Copyright (C) 1997-2003 Erez Zadok |
7 | * Copyright (C) 2001-2003 Stony Brook University |
8 | * Copyright (C) 2004-2008 International Business Machines Corp. |
9 | * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> |
10 | * Trevor S. Highland <trevor.highland@gmail.com> |
11 | * Tyler Hicks <code@tyhicks.com> |
12 | */ |
13 | |
14 | #ifndef ECRYPTFS_KERNEL_H |
15 | #define ECRYPTFS_KERNEL_H |
16 | |
17 | #include <crypto/skcipher.h> |
18 | #include <keys/user-type.h> |
19 | #include <keys/encrypted-type.h> |
20 | #include <linux/kernel.h> |
21 | #include <linux/fs.h> |
22 | #include <linux/fs_stack.h> |
23 | #include <linux/namei.h> |
24 | #include <linux/scatterlist.h> |
25 | #include <linux/hash.h> |
26 | #include <linux/nsproxy.h> |
27 | #include <linux/backing-dev.h> |
28 | #include <linux/ecryptfs.h> |
29 | |
30 | #define ECRYPTFS_DEFAULT_IV_BYTES 16 |
31 | #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096 |
32 | #define 8192 |
33 | #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32 |
34 | #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ |
35 | #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3) |
36 | #define ECRYPTFS_DEFAULT_NUM_USERS 4 |
37 | #define ECRYPTFS_MAX_NUM_USERS 32768 |
38 | #define ECRYPTFS_XATTR_NAME "user.ecryptfs" |
39 | |
40 | void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok); |
41 | static inline void |
42 | ecryptfs_to_hex(char *dst, char *src, size_t src_size) |
43 | { |
44 | char *end = bin2hex(dst, src, count: src_size); |
45 | *end = '\0'; |
46 | } |
47 | |
48 | extern void ecryptfs_from_hex(char *dst, char *src, int dst_size); |
49 | |
50 | struct ecryptfs_key_record { |
51 | unsigned char type; |
52 | size_t enc_key_size; |
53 | unsigned char sig[ECRYPTFS_SIG_SIZE]; |
54 | unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES]; |
55 | }; |
56 | |
57 | struct ecryptfs_auth_tok_list { |
58 | struct ecryptfs_auth_tok *auth_tok; |
59 | struct list_head list; |
60 | }; |
61 | |
62 | struct ecryptfs_crypt_stat; |
63 | struct ecryptfs_mount_crypt_stat; |
64 | |
65 | struct ecryptfs_page_crypt_context { |
66 | struct page *page; |
67 | #define ECRYPTFS_PREPARE_COMMIT_MODE 0 |
68 | #define ECRYPTFS_WRITEPAGE_MODE 1 |
69 | unsigned int mode; |
70 | union { |
71 | struct file *lower_file; |
72 | struct writeback_control *wbc; |
73 | } param; |
74 | }; |
75 | |
76 | #if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE) |
77 | static inline struct ecryptfs_auth_tok * |
78 | ecryptfs_get_encrypted_key_payload_data(struct key *key) |
79 | { |
80 | struct encrypted_key_payload *payload; |
81 | |
82 | if (key->type != &key_type_encrypted) |
83 | return NULL; |
84 | |
85 | payload = key->payload.data[0]; |
86 | if (!payload) |
87 | return ERR_PTR(error: -EKEYREVOKED); |
88 | |
89 | return (struct ecryptfs_auth_tok *)payload->payload_data; |
90 | } |
91 | |
92 | static inline struct key *ecryptfs_get_encrypted_key(char *sig) |
93 | { |
94 | return request_key(type: &key_type_encrypted, description: sig, NULL); |
95 | } |
96 | |
97 | #else |
98 | static inline struct ecryptfs_auth_tok * |
99 | ecryptfs_get_encrypted_key_payload_data(struct key *key) |
100 | { |
101 | return NULL; |
102 | } |
103 | |
104 | static inline struct key *ecryptfs_get_encrypted_key(char *sig) |
105 | { |
106 | return ERR_PTR(-ENOKEY); |
107 | } |
108 | |
109 | #endif /* CONFIG_ENCRYPTED_KEYS */ |
110 | |
111 | static inline struct ecryptfs_auth_tok * |
112 | ecryptfs_get_key_payload_data(struct key *key) |
113 | { |
114 | struct ecryptfs_auth_tok *auth_tok; |
115 | struct user_key_payload *ukp; |
116 | |
117 | auth_tok = ecryptfs_get_encrypted_key_payload_data(key); |
118 | if (auth_tok) |
119 | return auth_tok; |
120 | |
121 | ukp = user_key_payload_locked(key); |
122 | if (!ukp) |
123 | return ERR_PTR(error: -EKEYREVOKED); |
124 | |
125 | return (struct ecryptfs_auth_tok *)ukp->data; |
126 | } |
127 | |
128 | #define ECRYPTFS_MAX_KEYSET_SIZE 1024 |
129 | #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 31 |
130 | #define ECRYPTFS_MAX_NUM_ENC_KEYS 64 |
131 | #define ECRYPTFS_MAX_IV_BYTES 16 /* 128 bits */ |
132 | #define ECRYPTFS_SALT_BYTES 2 |
133 | #define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5 |
134 | #define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8 /* 4*2 */ |
135 | #define ECRYPTFS_FILE_SIZE_BYTES (sizeof(u64)) |
136 | #define ECRYPTFS_SIZE_AND_MARKER_BYTES (ECRYPTFS_FILE_SIZE_BYTES \ |
137 | + MAGIC_ECRYPTFS_MARKER_SIZE_BYTES) |
138 | #define ECRYPTFS_DEFAULT_CIPHER "aes" |
139 | #define ECRYPTFS_DEFAULT_KEY_BYTES 16 |
140 | #define ECRYPTFS_DEFAULT_HASH "md5" |
141 | #define ECRYPTFS_TAG_70_DIGEST ECRYPTFS_DEFAULT_HASH |
142 | #define ECRYPTFS_TAG_1_PACKET_TYPE 0x01 |
143 | #define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C |
144 | #define ECRYPTFS_TAG_11_PACKET_TYPE 0xED |
145 | #define ECRYPTFS_TAG_64_PACKET_TYPE 0x40 |
146 | #define ECRYPTFS_TAG_65_PACKET_TYPE 0x41 |
147 | #define ECRYPTFS_TAG_66_PACKET_TYPE 0x42 |
148 | #define ECRYPTFS_TAG_67_PACKET_TYPE 0x43 |
149 | #define ECRYPTFS_TAG_70_PACKET_TYPE 0x46 /* FNEK-encrypted filename |
150 | * as dentry name */ |
151 | #define ECRYPTFS_TAG_71_PACKET_TYPE 0x47 /* FNEK-encrypted filename in |
152 | * metadata */ |
153 | #define ECRYPTFS_TAG_72_PACKET_TYPE 0x48 /* FEK-encrypted filename as |
154 | * dentry name */ |
155 | #define ECRYPTFS_TAG_73_PACKET_TYPE 0x49 /* FEK-encrypted filename as |
156 | * metadata */ |
157 | #define ECRYPTFS_MIN_PKT_LEN_SIZE 1 /* Min size to specify packet length */ |
158 | #define ECRYPTFS_MAX_PKT_LEN_SIZE 2 /* Pass at least this many bytes to |
159 | * ecryptfs_parse_packet_length() and |
160 | * ecryptfs_write_packet_length() |
161 | */ |
162 | /* Constraint: ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES >= |
163 | * ECRYPTFS_MAX_IV_BYTES */ |
164 | #define ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES 16 |
165 | #define ECRYPTFS_NON_NULL 0x42 /* A reasonable substitute for NULL */ |
166 | #define MD5_DIGEST_SIZE 16 |
167 | #define ECRYPTFS_TAG_70_DIGEST_SIZE MD5_DIGEST_SIZE |
168 | #define ECRYPTFS_TAG_70_MIN_METADATA_SIZE (1 + ECRYPTFS_MIN_PKT_LEN_SIZE \ |
169 | + ECRYPTFS_SIG_SIZE + 1 + 1) |
170 | #define ECRYPTFS_TAG_70_MAX_METADATA_SIZE (1 + ECRYPTFS_MAX_PKT_LEN_SIZE \ |
171 | + ECRYPTFS_SIG_SIZE + 1 + 1) |
172 | #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FEK_ENCRYPTED." |
173 | #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX_SIZE 23 |
174 | #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FNEK_ENCRYPTED." |
175 | #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE 24 |
176 | #define ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN (18 + 1 + 4 + 1 + 32) |
177 | |
178 | #ifdef CONFIG_ECRYPT_FS_MESSAGING |
179 | # define ECRYPTFS_VERSIONING_MASK_MESSAGING (ECRYPTFS_VERSIONING_DEVMISC \ |
180 | | ECRYPTFS_VERSIONING_PUBKEY) |
181 | #else |
182 | # define ECRYPTFS_VERSIONING_MASK_MESSAGING 0 |
183 | #endif |
184 | |
185 | #define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \ |
186 | | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \ |
187 | | ECRYPTFS_VERSIONING_XATTR \ |
188 | | ECRYPTFS_VERSIONING_MULTKEY \ |
189 | | ECRYPTFS_VERSIONING_MASK_MESSAGING \ |
190 | | ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION) |
191 | struct ecryptfs_key_sig { |
192 | struct list_head crypt_stat_list; |
193 | char keysig[ECRYPTFS_SIG_SIZE_HEX + 1]; |
194 | }; |
195 | |
196 | struct ecryptfs_filename { |
197 | struct list_head crypt_stat_list; |
198 | #define ECRYPTFS_FILENAME_CONTAINS_DECRYPTED 0x00000001 |
199 | u32 flags; |
200 | u32 seq_no; |
201 | char *filename; |
202 | char *encrypted_filename; |
203 | size_t filename_size; |
204 | size_t encrypted_filename_size; |
205 | char fnek_sig[ECRYPTFS_SIG_SIZE_HEX]; |
206 | char dentry_name[ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN + 1]; |
207 | }; |
208 | |
209 | /** |
210 | * This is the primary struct associated with each encrypted file. |
211 | * |
212 | * TODO: cache align/pack? |
213 | */ |
214 | struct ecryptfs_crypt_stat { |
215 | #define ECRYPTFS_STRUCT_INITIALIZED 0x00000001 |
216 | #define ECRYPTFS_POLICY_APPLIED 0x00000002 |
217 | #define ECRYPTFS_ENCRYPTED 0x00000004 |
218 | #define ECRYPTFS_SECURITY_WARNING 0x00000008 |
219 | #define ECRYPTFS_ENABLE_HMAC 0x00000010 |
220 | #define ECRYPTFS_ENCRYPT_IV_PAGES 0x00000020 |
221 | #define ECRYPTFS_KEY_VALID 0x00000040 |
222 | #define ECRYPTFS_METADATA_IN_XATTR 0x00000080 |
223 | #define ECRYPTFS_VIEW_AS_ENCRYPTED 0x00000100 |
224 | #define ECRYPTFS_KEY_SET 0x00000200 |
225 | #define ECRYPTFS_ENCRYPT_FILENAMES 0x00000400 |
226 | #define ECRYPTFS_ENCFN_USE_MOUNT_FNEK 0x00000800 |
227 | #define ECRYPTFS_ENCFN_USE_FEK 0x00001000 |
228 | #define ECRYPTFS_UNLINK_SIGS 0x00002000 |
229 | #define ECRYPTFS_I_SIZE_INITIALIZED 0x00004000 |
230 | u32 flags; |
231 | unsigned int file_version; |
232 | size_t iv_bytes; |
233 | size_t metadata_size; |
234 | size_t extent_size; /* Data extent size; default is 4096 */ |
235 | size_t key_size; |
236 | size_t extent_shift; |
237 | unsigned int extent_mask; |
238 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
239 | struct crypto_skcipher *tfm; |
240 | struct crypto_shash *hash_tfm; /* Crypto context for generating |
241 | * the initialization vectors */ |
242 | unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; |
243 | unsigned char key[ECRYPTFS_MAX_KEY_BYTES]; |
244 | unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES]; |
245 | struct list_head keysig_list; |
246 | struct mutex keysig_list_mutex; |
247 | struct mutex cs_tfm_mutex; |
248 | struct mutex cs_mutex; |
249 | }; |
250 | |
251 | /* inode private data. */ |
252 | struct ecryptfs_inode_info { |
253 | struct inode vfs_inode; |
254 | struct inode *wii_inode; |
255 | struct mutex lower_file_mutex; |
256 | atomic_t lower_file_count; |
257 | struct file *lower_file; |
258 | struct ecryptfs_crypt_stat crypt_stat; |
259 | }; |
260 | |
261 | /* dentry private data. Each dentry must keep track of a lower |
262 | * vfsmount too. */ |
263 | struct ecryptfs_dentry_info { |
264 | struct path lower_path; |
265 | struct rcu_head rcu; |
266 | }; |
267 | |
268 | /** |
269 | * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint |
270 | * @flags: Status flags |
271 | * @mount_crypt_stat_list: These auth_toks hang off the mount-wide |
272 | * cryptographic context. Every time a new |
273 | * inode comes into existence, eCryptfs copies |
274 | * the auth_toks on that list to the set of |
275 | * auth_toks on the inode's crypt_stat |
276 | * @global_auth_tok_key: The key from the user's keyring for the sig |
277 | * @global_auth_tok: The key contents |
278 | * @sig: The key identifier |
279 | * |
280 | * ecryptfs_global_auth_tok structs refer to authentication token keys |
281 | * in the user keyring that apply to newly created files. A list of |
282 | * these objects hangs off of the mount_crypt_stat struct for any |
283 | * given eCryptfs mount. This struct maintains a reference to both the |
284 | * key contents and the key itself so that the key can be put on |
285 | * unmount. |
286 | */ |
287 | struct ecryptfs_global_auth_tok { |
288 | #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001 |
289 | #define ECRYPTFS_AUTH_TOK_FNEK 0x00000002 |
290 | u32 flags; |
291 | struct list_head mount_crypt_stat_list; |
292 | struct key *global_auth_tok_key; |
293 | unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1]; |
294 | }; |
295 | |
296 | /** |
297 | * ecryptfs_key_tfm - Persistent key tfm |
298 | * @key_tfm: crypto API handle to the key |
299 | * @key_size: Key size in bytes |
300 | * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is |
301 | * using the persistent TFM at any point in time |
302 | * @key_tfm_list: Handle to hang this off the module-wide TFM list |
303 | * @cipher_name: String name for the cipher for this TFM |
304 | * |
305 | * Typically, eCryptfs will use the same ciphers repeatedly throughout |
306 | * the course of its operations. In order to avoid unnecessarily |
307 | * destroying and initializing the same cipher repeatedly, eCryptfs |
308 | * keeps a list of crypto API contexts around to use when needed. |
309 | */ |
310 | struct ecryptfs_key_tfm { |
311 | struct crypto_skcipher *key_tfm; |
312 | size_t key_size; |
313 | struct mutex key_tfm_mutex; |
314 | struct list_head key_tfm_list; |
315 | unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; |
316 | }; |
317 | |
318 | extern struct mutex key_tfm_list_mutex; |
319 | |
320 | /** |
321 | * This struct is to enable a mount-wide passphrase/salt combo. This |
322 | * is more or less a stopgap to provide similar functionality to other |
323 | * crypto filesystems like EncFS or CFS until full policy support is |
324 | * implemented in eCryptfs. |
325 | */ |
326 | struct ecryptfs_mount_crypt_stat { |
327 | /* Pointers to memory we do not own, do not free these */ |
328 | #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001 |
329 | #define ECRYPTFS_XATTR_METADATA_ENABLED 0x00000002 |
330 | #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED 0x00000004 |
331 | #define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED 0x00000008 |
332 | #define ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES 0x00000010 |
333 | #define ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK 0x00000020 |
334 | #define ECRYPTFS_GLOBAL_ENCFN_USE_FEK 0x00000040 |
335 | #define ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY 0x00000080 |
336 | u32 flags; |
337 | struct list_head global_auth_tok_list; |
338 | struct mutex global_auth_tok_list_mutex; |
339 | size_t global_default_cipher_key_size; |
340 | size_t global_default_fn_cipher_key_bytes; |
341 | unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE |
342 | + 1]; |
343 | unsigned char global_default_fn_cipher_name[ |
344 | ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; |
345 | char global_default_fnek_sig[ECRYPTFS_SIG_SIZE_HEX + 1]; |
346 | }; |
347 | |
348 | /* superblock private data. */ |
349 | struct ecryptfs_sb_info { |
350 | struct super_block *wsi_sb; |
351 | struct ecryptfs_mount_crypt_stat mount_crypt_stat; |
352 | }; |
353 | |
354 | /* file private data. */ |
355 | struct ecryptfs_file_info { |
356 | struct file *wfi_file; |
357 | struct ecryptfs_crypt_stat *crypt_stat; |
358 | }; |
359 | |
360 | /* auth_tok <=> encrypted_session_key mappings */ |
361 | struct ecryptfs_auth_tok_list_item { |
362 | unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES]; |
363 | struct list_head list; |
364 | struct ecryptfs_auth_tok auth_tok; |
365 | }; |
366 | |
367 | struct ecryptfs_message { |
368 | /* Can never be greater than ecryptfs_message_buf_len */ |
369 | /* Used to find the parent msg_ctx */ |
370 | /* Inherits from msg_ctx->index */ |
371 | u32 index; |
372 | u32 data_len; |
373 | u8 data[]; |
374 | }; |
375 | |
376 | struct ecryptfs_msg_ctx { |
377 | #define ECRYPTFS_MSG_CTX_STATE_FREE 0x01 |
378 | #define ECRYPTFS_MSG_CTX_STATE_PENDING 0x02 |
379 | #define ECRYPTFS_MSG_CTX_STATE_DONE 0x03 |
380 | #define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04 |
381 | u8 state; |
382 | #define ECRYPTFS_MSG_HELO 100 |
383 | #define ECRYPTFS_MSG_QUIT 101 |
384 | #define ECRYPTFS_MSG_REQUEST 102 |
385 | #define ECRYPTFS_MSG_RESPONSE 103 |
386 | u8 type; |
387 | u32 index; |
388 | /* Counter converts to a sequence number. Each message sent |
389 | * out for which we expect a response has an associated |
390 | * sequence number. The response must have the same sequence |
391 | * number as the counter for the msg_stc for the message to be |
392 | * valid. */ |
393 | u32 counter; |
394 | size_t msg_size; |
395 | struct ecryptfs_message *msg; |
396 | struct task_struct *task; |
397 | struct list_head node; |
398 | struct list_head daemon_out_list; |
399 | struct mutex mux; |
400 | }; |
401 | |
402 | struct ecryptfs_daemon { |
403 | #define ECRYPTFS_DAEMON_IN_READ 0x00000001 |
404 | #define ECRYPTFS_DAEMON_IN_POLL 0x00000002 |
405 | #define ECRYPTFS_DAEMON_ZOMBIE 0x00000004 |
406 | #define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008 |
407 | u32 flags; |
408 | u32 num_queued_msg_ctx; |
409 | struct file *file; |
410 | struct mutex mux; |
411 | struct list_head msg_ctx_out_queue; |
412 | wait_queue_head_t wait; |
413 | struct hlist_node euid_chain; |
414 | }; |
415 | |
416 | #ifdef CONFIG_ECRYPT_FS_MESSAGING |
417 | extern struct mutex ecryptfs_daemon_hash_mux; |
418 | #endif |
419 | |
420 | static inline size_t |
421 | (struct ecryptfs_crypt_stat *crypt_stat) |
422 | { |
423 | if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) |
424 | return 0; |
425 | return crypt_stat->metadata_size; |
426 | } |
427 | |
428 | static inline struct ecryptfs_file_info * |
429 | ecryptfs_file_to_private(struct file *file) |
430 | { |
431 | return file->private_data; |
432 | } |
433 | |
434 | static inline void |
435 | ecryptfs_set_file_private(struct file *file, |
436 | struct ecryptfs_file_info *file_info) |
437 | { |
438 | file->private_data = file_info; |
439 | } |
440 | |
441 | static inline struct file *ecryptfs_file_to_lower(struct file *file) |
442 | { |
443 | return ((struct ecryptfs_file_info *)file->private_data)->wfi_file; |
444 | } |
445 | |
446 | static inline void |
447 | ecryptfs_set_file_lower(struct file *file, struct file *lower_file) |
448 | { |
449 | ((struct ecryptfs_file_info *)file->private_data)->wfi_file = |
450 | lower_file; |
451 | } |
452 | |
453 | static inline struct ecryptfs_inode_info * |
454 | ecryptfs_inode_to_private(struct inode *inode) |
455 | { |
456 | return container_of(inode, struct ecryptfs_inode_info, vfs_inode); |
457 | } |
458 | |
459 | static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode) |
460 | { |
461 | return ecryptfs_inode_to_private(inode)->wii_inode; |
462 | } |
463 | |
464 | static inline void |
465 | ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode) |
466 | { |
467 | ecryptfs_inode_to_private(inode)->wii_inode = lower_inode; |
468 | } |
469 | |
470 | static inline struct ecryptfs_sb_info * |
471 | ecryptfs_superblock_to_private(struct super_block *sb) |
472 | { |
473 | return (struct ecryptfs_sb_info *)sb->s_fs_info; |
474 | } |
475 | |
476 | static inline void |
477 | ecryptfs_set_superblock_private(struct super_block *sb, |
478 | struct ecryptfs_sb_info *sb_info) |
479 | { |
480 | sb->s_fs_info = sb_info; |
481 | } |
482 | |
483 | static inline struct super_block * |
484 | ecryptfs_superblock_to_lower(struct super_block *sb) |
485 | { |
486 | return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb; |
487 | } |
488 | |
489 | static inline void |
490 | ecryptfs_set_superblock_lower(struct super_block *sb, |
491 | struct super_block *lower_sb) |
492 | { |
493 | ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb; |
494 | } |
495 | |
496 | static inline void |
497 | ecryptfs_set_dentry_private(struct dentry *dentry, |
498 | struct ecryptfs_dentry_info *dentry_info) |
499 | { |
500 | dentry->d_fsdata = dentry_info; |
501 | } |
502 | |
503 | static inline struct dentry * |
504 | ecryptfs_dentry_to_lower(struct dentry *dentry) |
505 | { |
506 | return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry; |
507 | } |
508 | |
509 | static inline const struct path * |
510 | ecryptfs_dentry_to_lower_path(struct dentry *dentry) |
511 | { |
512 | return &((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path; |
513 | } |
514 | |
515 | #define ecryptfs_printk(type, fmt, arg...) \ |
516 | __ecryptfs_printk(type "%s: " fmt, __func__, ## arg) |
517 | __printf(1, 2) |
518 | void __ecryptfs_printk(const char *fmt, ...); |
519 | |
520 | extern const struct file_operations ecryptfs_main_fops; |
521 | extern const struct file_operations ecryptfs_dir_fops; |
522 | extern const struct inode_operations ecryptfs_main_iops; |
523 | extern const struct inode_operations ecryptfs_dir_iops; |
524 | extern const struct inode_operations ecryptfs_symlink_iops; |
525 | extern const struct super_operations ecryptfs_sops; |
526 | extern const struct dentry_operations ecryptfs_dops; |
527 | extern const struct address_space_operations ecryptfs_aops; |
528 | extern int ecryptfs_verbosity; |
529 | extern unsigned int ecryptfs_message_buf_len; |
530 | extern signed long ecryptfs_message_wait_timeout; |
531 | extern unsigned int ecryptfs_number_of_users; |
532 | |
533 | extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache; |
534 | extern struct kmem_cache *ecryptfs_file_info_cache; |
535 | extern struct kmem_cache *ecryptfs_dentry_info_cache; |
536 | extern struct kmem_cache *ecryptfs_inode_info_cache; |
537 | extern struct kmem_cache *ecryptfs_sb_info_cache; |
538 | extern struct kmem_cache *; |
539 | extern struct kmem_cache *ecryptfs_xattr_cache; |
540 | extern struct kmem_cache *ecryptfs_key_record_cache; |
541 | extern struct kmem_cache *ecryptfs_key_sig_cache; |
542 | extern struct kmem_cache *ecryptfs_global_auth_tok_cache; |
543 | extern struct kmem_cache *ecryptfs_key_tfm_cache; |
544 | |
545 | struct inode *ecryptfs_get_inode(struct inode *lower_inode, |
546 | struct super_block *sb); |
547 | void ecryptfs_i_size_init(const char *page_virt, struct inode *inode); |
548 | int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, |
549 | struct inode *ecryptfs_inode); |
550 | int ecryptfs_decode_and_decrypt_filename(char **decrypted_name, |
551 | size_t *decrypted_name_size, |
552 | struct super_block *sb, |
553 | const char *name, size_t name_size); |
554 | int ecryptfs_fill_zeros(struct file *file, loff_t new_length); |
555 | int ecryptfs_encrypt_and_encode_filename( |
556 | char **encoded_name, |
557 | size_t *encoded_name_size, |
558 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat, |
559 | const char *name, size_t name_size); |
560 | struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry); |
561 | void ecryptfs_dump_hex(char *data, int bytes); |
562 | int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg, |
563 | int sg_size); |
564 | int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat); |
565 | void ecryptfs_rotate_iv(unsigned char *iv); |
566 | int ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); |
567 | void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); |
568 | void ecryptfs_destroy_mount_crypt_stat( |
569 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat); |
570 | int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat); |
571 | int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode); |
572 | int ecryptfs_encrypt_page(struct page *page); |
573 | int ecryptfs_decrypt_page(struct page *page); |
574 | int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry, |
575 | struct inode *ecryptfs_inode); |
576 | int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry); |
577 | int ecryptfs_new_file_context(struct inode *ecryptfs_inode); |
578 | void ecryptfs_write_crypt_stat_flags(char *page_virt, |
579 | struct ecryptfs_crypt_stat *crypt_stat, |
580 | size_t *written); |
581 | int ecryptfs_read_and_validate_header_region(struct inode *inode); |
582 | int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry, |
583 | struct inode *inode); |
584 | u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes); |
585 | int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code); |
586 | void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat); |
587 | int ecryptfs_generate_key_packet_set(char *dest_base, |
588 | struct ecryptfs_crypt_stat *crypt_stat, |
589 | struct dentry *ecryptfs_dentry, |
590 | size_t *len, size_t max); |
591 | int |
592 | ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat, |
593 | unsigned char *src, struct dentry *ecryptfs_dentry); |
594 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length); |
595 | ssize_t |
596 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode, |
597 | const char *name, void *value, size_t size); |
598 | int |
599 | ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, const char *name, |
600 | const void *value, size_t size, int flags); |
601 | int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode); |
602 | #ifdef CONFIG_ECRYPT_FS_MESSAGING |
603 | int ecryptfs_process_response(struct ecryptfs_daemon *daemon, |
604 | struct ecryptfs_message *msg, u32 seq); |
605 | int ecryptfs_send_message(char *data, int data_len, |
606 | struct ecryptfs_msg_ctx **msg_ctx); |
607 | int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx, |
608 | struct ecryptfs_message **emsg); |
609 | int ecryptfs_init_messaging(void); |
610 | void ecryptfs_release_messaging(void); |
611 | #else |
612 | static inline int ecryptfs_init_messaging(void) |
613 | { |
614 | return 0; |
615 | } |
616 | static inline void ecryptfs_release_messaging(void) |
617 | { } |
618 | static inline int ecryptfs_send_message(char *data, int data_len, |
619 | struct ecryptfs_msg_ctx **msg_ctx) |
620 | { |
621 | return -ENOTCONN; |
622 | } |
623 | static inline int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx, |
624 | struct ecryptfs_message **emsg) |
625 | { |
626 | return -ENOMSG; |
627 | } |
628 | #endif |
629 | |
630 | void |
631 | (char *virt, |
632 | struct ecryptfs_crypt_stat *crypt_stat, |
633 | size_t *written); |
634 | int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig); |
635 | int |
636 | ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat, |
637 | char *sig, u32 global_auth_tok_flags); |
638 | int ecryptfs_get_global_auth_tok_for_sig( |
639 | struct ecryptfs_global_auth_tok **global_auth_tok, |
640 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig); |
641 | int |
642 | ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name, |
643 | size_t key_size); |
644 | int ecryptfs_init_crypto(void); |
645 | int ecryptfs_destroy_crypto(void); |
646 | int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm); |
647 | int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_skcipher **tfm, |
648 | struct mutex **tfm_mutex, |
649 | char *cipher_name); |
650 | int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key, |
651 | struct ecryptfs_auth_tok **auth_tok, |
652 | char *sig); |
653 | int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data, |
654 | loff_t offset, size_t size); |
655 | int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode, |
656 | struct page *page_for_lower, |
657 | size_t offset_in_page, size_t size); |
658 | int ecryptfs_write(struct inode *inode, char *data, loff_t offset, size_t size); |
659 | int ecryptfs_read_lower(char *data, loff_t offset, size_t size, |
660 | struct inode *ecryptfs_inode); |
661 | int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs, |
662 | pgoff_t page_index, |
663 | size_t offset_in_page, size_t size, |
664 | struct inode *ecryptfs_inode); |
665 | struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index); |
666 | int ecryptfs_parse_packet_length(unsigned char *data, size_t *size, |
667 | size_t *length_size); |
668 | int ecryptfs_write_packet_length(char *dest, size_t size, |
669 | size_t *packet_size_length); |
670 | #ifdef CONFIG_ECRYPT_FS_MESSAGING |
671 | int ecryptfs_init_ecryptfs_miscdev(void); |
672 | void ecryptfs_destroy_ecryptfs_miscdev(void); |
673 | int ecryptfs_send_miscdev(char *data, size_t data_size, |
674 | struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type, |
675 | u16 msg_flags, struct ecryptfs_daemon *daemon); |
676 | void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx); |
677 | int |
678 | ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, struct file *file); |
679 | int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon); |
680 | int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon); |
681 | #endif |
682 | int ecryptfs_init_kthread(void); |
683 | void ecryptfs_destroy_kthread(void); |
684 | int ecryptfs_privileged_open(struct file **lower_file, |
685 | struct dentry *lower_dentry, |
686 | struct vfsmount *lower_mnt, |
687 | const struct cred *cred); |
688 | int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode); |
689 | void ecryptfs_put_lower_file(struct inode *inode); |
690 | int |
691 | ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes, |
692 | size_t *packet_size, |
693 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat, |
694 | char *filename, size_t filename_size); |
695 | int |
696 | ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size, |
697 | size_t *packet_size, |
698 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat, |
699 | char *data, size_t max_packet_size); |
700 | int ecryptfs_set_f_namelen(long *namelen, long lower_namelen, |
701 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat); |
702 | int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat, |
703 | loff_t offset); |
704 | |
705 | extern const struct xattr_handler * const ecryptfs_xattr_handlers[]; |
706 | |
707 | #endif /* #ifndef ECRYPTFS_KERNEL_H */ |
708 | |