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1 | /** |
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 |
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> |
11 | * |
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> |
33 | #include <linux/fs_stack.h> |
34 | #include <linux/namei.h> |
35 | #include <linux/scatterlist.h> |
36 | #include <linux/hash.h> |
37 | #include <linux/nsproxy.h> |
38 | #include <linux/backing-dev.h> |
39 | |
40 | /* Version verification for shared data structures w/ userspace */ |
41 | #define ECRYPTFS_VERSION_MAJOR 0x00 |
42 | #define ECRYPTFS_VERSION_MINOR 0x04 |
43 | #define ECRYPTFS_SUPPORTED_FILE_VERSION 0x03 |
44 | /* 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. */ |
48 | #define ECRYPTFS_VERSIONING_PASSPHRASE 0x00000001 |
49 | #define ECRYPTFS_VERSIONING_PUBKEY 0x00000002 |
50 | #define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004 |
51 | #define ECRYPTFS_VERSIONING_POLICY 0x00000008 |
52 | #define ECRYPTFS_VERSIONING_XATTR 0x00000010 |
53 | #define ECRYPTFS_VERSIONING_MULTKEY 0x00000020 |
54 | #define ECRYPTFS_VERSIONING_DEVMISC 0x00000040 |
55 | #define ECRYPTFS_VERSIONING_HMAC 0x00000080 |
56 | #define ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION 0x00000100 |
57 | #define ECRYPTFS_VERSIONING_GCM 0x00000200 |
58 | #define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \ |
59 | | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \ |
60 | | ECRYPTFS_VERSIONING_PUBKEY \ |
61 | | ECRYPTFS_VERSIONING_XATTR \ |
62 | | ECRYPTFS_VERSIONING_MULTKEY \ |
63 | | ECRYPTFS_VERSIONING_DEVMISC \ |
64 | | ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION) |
65 | #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 |
78 | #define ECRYPTFS_FILE_VERSION 0x03 |
79 | #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096 |
80 | #define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192 |
81 | #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32 |
82 | #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ |
83 | #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3) |
84 | #define ECRYPTFS_MAX_PKI_NAME_BYTES 16 |
85 | #define ECRYPTFS_DEFAULT_NUM_USERS 4 |
86 | #define ECRYPTFS_MAX_NUM_USERS 32768 |
87 | #define ECRYPTFS_XATTR_NAME "user.ecryptfs" |
88 | |
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 | |
98 | #define RFC2440_CIPHER_RSA 0x01 |
99 | |
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 | */ |
107 | struct 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 | |
119 | struct 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 | |
134 | enum ecryptfs_token_types {ECRYPTFS_PASSWORD, ECRYPTFS_PRIVATE_KEY}; |
135 | |
136 | struct 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 | |
144 | /* May be a password or a private key */ |
145 | struct ecryptfs_auth_tok { |
146 | u16 version; /* 8-bit major and 8-bit minor */ |
147 | u16 token_type; |
148 | #define ECRYPTFS_ENCRYPT_ONLY 0x00000001 |
149 | u32 flags; |
150 | struct ecryptfs_session_key session_key; |
151 | u8 reserved[32]; |
152 | union { |
153 | struct ecryptfs_password password; |
154 | struct ecryptfs_private_key private_key; |
155 | } token; |
156 | } __attribute__ ((packed)); |
157 | |
158 | void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok); |
159 | extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size); |
160 | extern void ecryptfs_from_hex(char *dst, char *src, int dst_size); |
161 | |
162 | struct 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 | |
169 | struct ecryptfs_auth_tok_list { |
170 | struct ecryptfs_auth_tok *auth_tok; |
171 | struct list_head list; |
172 | }; |
173 | |
174 | struct ecryptfs_crypt_stat; |
175 | struct ecryptfs_mount_crypt_stat; |
176 | |
177 | struct 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 | |
188 | static inline struct ecryptfs_auth_tok * |
189 | ecryptfs_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_MAX_KEYSET_SIZE 1024 |
196 | #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32 |
197 | #define ECRYPTFS_MAX_NUM_ENC_KEYS 64 |
198 | #define ECRYPTFS_MAX_IV_BYTES 16 /* 128 bits */ |
199 | #define ECRYPTFS_SALT_BYTES 2 |
200 | #define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5 |
201 | #define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8 /* 4*2 */ |
202 | #define ECRYPTFS_FILE_SIZE_BYTES (sizeof(u64)) |
203 | #define ECRYPTFS_SIZE_AND_MARKER_BYTES (ECRYPTFS_FILE_SIZE_BYTES \ |
204 | + MAGIC_ECRYPTFS_MARKER_SIZE_BYTES) |
205 | #define ECRYPTFS_DEFAULT_CIPHER "aes" |
206 | #define ECRYPTFS_DEFAULT_KEY_BYTES 16 |
207 | #define ECRYPTFS_DEFAULT_HASH "md5" |
208 | #define ECRYPTFS_TAG_70_DIGEST ECRYPTFS_DEFAULT_HASH |
209 | #define ECRYPTFS_TAG_1_PACKET_TYPE 0x01 |
210 | #define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C |
211 | #define ECRYPTFS_TAG_11_PACKET_TYPE 0xED |
212 | #define ECRYPTFS_TAG_64_PACKET_TYPE 0x40 |
213 | #define ECRYPTFS_TAG_65_PACKET_TYPE 0x41 |
214 | #define ECRYPTFS_TAG_66_PACKET_TYPE 0x42 |
215 | #define ECRYPTFS_TAG_67_PACKET_TYPE 0x43 |
216 | #define ECRYPTFS_TAG_70_PACKET_TYPE 0x46 /* FNEK-encrypted filename |
217 | * as dentry name */ |
218 | #define ECRYPTFS_TAG_71_PACKET_TYPE 0x47 /* FNEK-encrypted filename in |
219 | * metadata */ |
220 | #define ECRYPTFS_TAG_72_PACKET_TYPE 0x48 /* FEK-encrypted filename as |
221 | * dentry name */ |
222 | #define ECRYPTFS_TAG_73_PACKET_TYPE 0x49 /* FEK-encrypted filename as |
223 | * metadata */ |
224 | /* Constraint: ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES >= |
225 | * ECRYPTFS_MAX_IV_BYTES */ |
226 | #define ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES 16 |
227 | #define ECRYPTFS_NON_NULL 0x42 /* A reasonable substitute for NULL */ |
228 | #define MD5_DIGEST_SIZE 16 |
229 | #define ECRYPTFS_TAG_70_DIGEST_SIZE MD5_DIGEST_SIZE |
230 | #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FEK_ENCRYPTED." |
231 | #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX_SIZE 23 |
232 | #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FNEK_ENCRYPTED." |
233 | #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE 24 |
234 | #define ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN (18 + 1 + 4 + 1 + 32) |
235 | |
236 | struct ecryptfs_key_sig { |
237 | struct list_head crypt_stat_list; |
238 | char keysig[ECRYPTFS_SIG_SIZE_HEX + 1]; |
239 | }; |
240 | |
241 | struct ecryptfs_filename { |
242 | struct list_head crypt_stat_list; |
243 | #define ECRYPTFS_FILENAME_CONTAINS_DECRYPTED 0x00000001 |
244 | u32 flags; |
245 | u32 seq_no; |
246 | char *filename; |
247 | char *encrypted_filename; |
248 | size_t filename_size; |
249 | size_t encrypted_filename_size; |
250 | char fnek_sig[ECRYPTFS_SIG_SIZE_HEX]; |
251 | char dentry_name[ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN + 1]; |
252 | }; |
253 | |
254 | /** |
255 | * This is the primary struct associated with each encrypted file. |
256 | * |
257 | * TODO: cache align/pack? |
258 | */ |
259 | struct ecryptfs_crypt_stat { |
260 | #define ECRYPTFS_STRUCT_INITIALIZED 0x00000001 |
261 | #define ECRYPTFS_POLICY_APPLIED 0x00000002 |
262 | #define ECRYPTFS_ENCRYPTED 0x00000004 |
263 | #define ECRYPTFS_SECURITY_WARNING 0x00000008 |
264 | #define ECRYPTFS_ENABLE_HMAC 0x00000010 |
265 | #define ECRYPTFS_ENCRYPT_IV_PAGES 0x00000020 |
266 | #define ECRYPTFS_KEY_VALID 0x00000040 |
267 | #define ECRYPTFS_METADATA_IN_XATTR 0x00000080 |
268 | #define ECRYPTFS_VIEW_AS_ENCRYPTED 0x00000100 |
269 | #define ECRYPTFS_KEY_SET 0x00000200 |
270 | #define ECRYPTFS_ENCRYPT_FILENAMES 0x00000400 |
271 | #define ECRYPTFS_ENCFN_USE_MOUNT_FNEK 0x00000800 |
272 | #define ECRYPTFS_ENCFN_USE_FEK 0x00001000 |
273 | #define ECRYPTFS_UNLINK_SIGS 0x00002000 |
274 | #define ECRYPTFS_I_SIZE_INITIALIZED 0x00004000 |
275 | u32 flags; |
276 | unsigned int file_version; |
277 | size_t iv_bytes; |
278 | size_t metadata_size; |
279 | size_t extent_size; /* Data extent size; default is 4096 */ |
280 | size_t key_size; |
281 | size_t extent_shift; |
282 | unsigned int extent_mask; |
283 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
284 | struct crypto_blkcipher *tfm; |
285 | struct crypto_hash *hash_tfm; /* Crypto context for generating |
286 | * the initialization vectors */ |
287 | unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE]; |
288 | unsigned char key[ECRYPTFS_MAX_KEY_BYTES]; |
289 | unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES]; |
290 | struct list_head keysig_list; |
291 | struct mutex keysig_list_mutex; |
292 | struct mutex cs_tfm_mutex; |
293 | struct mutex cs_hash_tfm_mutex; |
294 | struct mutex cs_mutex; |
295 | }; |
296 | |
297 | /* inode private data. */ |
298 | struct ecryptfs_inode_info { |
299 | struct inode vfs_inode; |
300 | struct inode *wii_inode; |
301 | struct mutex lower_file_mutex; |
302 | atomic_t lower_file_count; |
303 | struct file *lower_file; |
304 | struct ecryptfs_crypt_stat crypt_stat; |
305 | }; |
306 | |
307 | /* dentry private data. Each dentry must keep track of a lower |
308 | * vfsmount too. */ |
309 | struct ecryptfs_dentry_info { |
310 | struct path lower_path; |
311 | struct ecryptfs_crypt_stat *crypt_stat; |
312 | }; |
313 | |
314 | /** |
315 | * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint |
316 | * @flags: Status flags |
317 | * @mount_crypt_stat_list: These auth_toks hang off the mount-wide |
318 | * cryptographic context. Every time a new |
319 | * inode comes into existence, eCryptfs copies |
320 | * the auth_toks on that list to the set of |
321 | * auth_toks on the inode's crypt_stat |
322 | * @global_auth_tok_key: The key from the user's keyring for the sig |
323 | * @global_auth_tok: The key contents |
324 | * @sig: The key identifier |
325 | * |
326 | * ecryptfs_global_auth_tok structs refer to authentication token keys |
327 | * in the user keyring that apply to newly created files. A list of |
328 | * these objects hangs off of the mount_crypt_stat struct for any |
329 | * given eCryptfs mount. This struct maintains a reference to both the |
330 | * key contents and the key itself so that the key can be put on |
331 | * unmount. |
332 | */ |
333 | struct ecryptfs_global_auth_tok { |
334 | #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001 |
335 | #define ECRYPTFS_AUTH_TOK_FNEK 0x00000002 |
336 | u32 flags; |
337 | struct list_head mount_crypt_stat_list; |
338 | struct key *global_auth_tok_key; |
339 | unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1]; |
340 | }; |
341 | |
342 | /** |
343 | * ecryptfs_key_tfm - Persistent key tfm |
344 | * @key_tfm: crypto API handle to the key |
345 | * @key_size: Key size in bytes |
346 | * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is |
347 | * using the persistent TFM at any point in time |
348 | * @key_tfm_list: Handle to hang this off the module-wide TFM list |
349 | * @cipher_name: String name for the cipher for this TFM |
350 | * |
351 | * Typically, eCryptfs will use the same ciphers repeatedly throughout |
352 | * the course of its operations. In order to avoid unnecessarily |
353 | * destroying and initializing the same cipher repeatedly, eCryptfs |
354 | * keeps a list of crypto API contexts around to use when needed. |
355 | */ |
356 | struct ecryptfs_key_tfm { |
357 | struct crypto_blkcipher *key_tfm; |
358 | size_t key_size; |
359 | struct mutex key_tfm_mutex; |
360 | struct list_head key_tfm_list; |
361 | unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; |
362 | }; |
363 | |
364 | extern struct mutex key_tfm_list_mutex; |
365 | |
366 | /** |
367 | * This struct is to enable a mount-wide passphrase/salt combo. This |
368 | * is more or less a stopgap to provide similar functionality to other |
369 | * crypto filesystems like EncFS or CFS until full policy support is |
370 | * implemented in eCryptfs. |
371 | */ |
372 | struct ecryptfs_mount_crypt_stat { |
373 | /* Pointers to memory we do not own, do not free these */ |
374 | #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001 |
375 | #define ECRYPTFS_XATTR_METADATA_ENABLED 0x00000002 |
376 | #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED 0x00000004 |
377 | #define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED 0x00000008 |
378 | #define ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES 0x00000010 |
379 | #define ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK 0x00000020 |
380 | #define ECRYPTFS_GLOBAL_ENCFN_USE_FEK 0x00000040 |
381 | #define ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY 0x00000080 |
382 | u32 flags; |
383 | struct list_head global_auth_tok_list; |
384 | struct mutex global_auth_tok_list_mutex; |
385 | size_t global_default_cipher_key_size; |
386 | size_t global_default_fn_cipher_key_bytes; |
387 | unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE |
388 | + 1]; |
389 | unsigned char global_default_fn_cipher_name[ |
390 | ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; |
391 | char global_default_fnek_sig[ECRYPTFS_SIG_SIZE_HEX + 1]; |
392 | }; |
393 | |
394 | /* superblock private data. */ |
395 | struct ecryptfs_sb_info { |
396 | struct super_block *wsi_sb; |
397 | struct ecryptfs_mount_crypt_stat mount_crypt_stat; |
398 | struct backing_dev_info bdi; |
399 | }; |
400 | |
401 | /* file private data. */ |
402 | struct ecryptfs_file_info { |
403 | struct file *wfi_file; |
404 | struct ecryptfs_crypt_stat *crypt_stat; |
405 | }; |
406 | |
407 | /* auth_tok <=> encrypted_session_key mappings */ |
408 | struct ecryptfs_auth_tok_list_item { |
409 | unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES]; |
410 | struct list_head list; |
411 | struct ecryptfs_auth_tok auth_tok; |
412 | }; |
413 | |
414 | struct ecryptfs_message { |
415 | /* Can never be greater than ecryptfs_message_buf_len */ |
416 | /* Used to find the parent msg_ctx */ |
417 | /* Inherits from msg_ctx->index */ |
418 | u32 index; |
419 | u32 data_len; |
420 | u8 data[]; |
421 | }; |
422 | |
423 | struct ecryptfs_msg_ctx { |
424 | #define ECRYPTFS_MSG_CTX_STATE_FREE 0x01 |
425 | #define ECRYPTFS_MSG_CTX_STATE_PENDING 0x02 |
426 | #define ECRYPTFS_MSG_CTX_STATE_DONE 0x03 |
427 | #define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04 |
428 | u8 state; |
429 | #define ECRYPTFS_MSG_HELO 100 |
430 | #define ECRYPTFS_MSG_QUIT 101 |
431 | #define ECRYPTFS_MSG_REQUEST 102 |
432 | #define ECRYPTFS_MSG_RESPONSE 103 |
433 | u8 type; |
434 | u32 index; |
435 | /* Counter converts to a sequence number. Each message sent |
436 | * out for which we expect a response has an associated |
437 | * sequence number. The response must have the same sequence |
438 | * number as the counter for the msg_stc for the message to be |
439 | * valid. */ |
440 | u32 counter; |
441 | size_t msg_size; |
442 | struct ecryptfs_message *msg; |
443 | struct task_struct *task; |
444 | struct list_head node; |
445 | struct list_head daemon_out_list; |
446 | struct mutex mux; |
447 | }; |
448 | |
449 | struct ecryptfs_daemon; |
450 | |
451 | struct ecryptfs_daemon { |
452 | #define ECRYPTFS_DAEMON_IN_READ 0x00000001 |
453 | #define ECRYPTFS_DAEMON_IN_POLL 0x00000002 |
454 | #define ECRYPTFS_DAEMON_ZOMBIE 0x00000004 |
455 | #define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008 |
456 | u32 flags; |
457 | u32 num_queued_msg_ctx; |
458 | struct pid *pid; |
459 | uid_t euid; |
460 | struct user_namespace *user_ns; |
461 | struct task_struct *task; |
462 | struct mutex mux; |
463 | struct list_head msg_ctx_out_queue; |
464 | wait_queue_head_t wait; |
465 | struct hlist_node euid_chain; |
466 | }; |
467 | |
468 | extern struct mutex ecryptfs_daemon_hash_mux; |
469 | |
470 | static inline size_t |
471 | ecryptfs_lower_header_size(struct ecryptfs_crypt_stat *crypt_stat) |
472 | { |
473 | if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) |
474 | return 0; |
475 | return crypt_stat->metadata_size; |
476 | } |
477 | |
478 | static inline struct ecryptfs_file_info * |
479 | ecryptfs_file_to_private(struct file *file) |
480 | { |
481 | return file->private_data; |
482 | } |
483 | |
484 | static inline void |
485 | ecryptfs_set_file_private(struct file *file, |
486 | struct ecryptfs_file_info *file_info) |
487 | { |
488 | file->private_data = file_info; |
489 | } |
490 | |
491 | static inline struct file *ecryptfs_file_to_lower(struct file *file) |
492 | { |
493 | return ((struct ecryptfs_file_info *)file->private_data)->wfi_file; |
494 | } |
495 | |
496 | static inline void |
497 | ecryptfs_set_file_lower(struct file *file, struct file *lower_file) |
498 | { |
499 | ((struct ecryptfs_file_info *)file->private_data)->wfi_file = |
500 | lower_file; |
501 | } |
502 | |
503 | static inline struct ecryptfs_inode_info * |
504 | ecryptfs_inode_to_private(struct inode *inode) |
505 | { |
506 | return container_of(inode, struct ecryptfs_inode_info, vfs_inode); |
507 | } |
508 | |
509 | static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode) |
510 | { |
511 | return ecryptfs_inode_to_private(inode)->wii_inode; |
512 | } |
513 | |
514 | static inline void |
515 | ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode) |
516 | { |
517 | ecryptfs_inode_to_private(inode)->wii_inode = lower_inode; |
518 | } |
519 | |
520 | static inline struct ecryptfs_sb_info * |
521 | ecryptfs_superblock_to_private(struct super_block *sb) |
522 | { |
523 | return (struct ecryptfs_sb_info *)sb->s_fs_info; |
524 | } |
525 | |
526 | static inline void |
527 | ecryptfs_set_superblock_private(struct super_block *sb, |
528 | struct ecryptfs_sb_info *sb_info) |
529 | { |
530 | sb->s_fs_info = sb_info; |
531 | } |
532 | |
533 | static inline struct super_block * |
534 | ecryptfs_superblock_to_lower(struct super_block *sb) |
535 | { |
536 | return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb; |
537 | } |
538 | |
539 | static inline void |
540 | ecryptfs_set_superblock_lower(struct super_block *sb, |
541 | struct super_block *lower_sb) |
542 | { |
543 | ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb; |
544 | } |
545 | |
546 | static inline struct ecryptfs_dentry_info * |
547 | ecryptfs_dentry_to_private(struct dentry *dentry) |
548 | { |
549 | return (struct ecryptfs_dentry_info *)dentry->d_fsdata; |
550 | } |
551 | |
552 | static inline void |
553 | ecryptfs_set_dentry_private(struct dentry *dentry, |
554 | struct ecryptfs_dentry_info *dentry_info) |
555 | { |
556 | dentry->d_fsdata = dentry_info; |
557 | } |
558 | |
559 | static inline struct dentry * |
560 | ecryptfs_dentry_to_lower(struct dentry *dentry) |
561 | { |
562 | return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry; |
563 | } |
564 | |
565 | static inline void |
566 | ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry) |
567 | { |
568 | ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry = |
569 | lower_dentry; |
570 | } |
571 | |
572 | static inline struct vfsmount * |
573 | ecryptfs_dentry_to_lower_mnt(struct dentry *dentry) |
574 | { |
575 | return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt; |
576 | } |
577 | |
578 | static inline void |
579 | ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt) |
580 | { |
581 | ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt = |
582 | lower_mnt; |
583 | } |
584 | |
585 | #define ecryptfs_printk(type, fmt, arg...) \ |
586 | __ecryptfs_printk(type "%s: " fmt, __func__, ## arg); |
587 | __attribute__ ((format(printf, 1, 2))) |
588 | void __ecryptfs_printk(const char *fmt, ...); |
589 | |
590 | extern const struct file_operations ecryptfs_main_fops; |
591 | extern const struct file_operations ecryptfs_dir_fops; |
592 | extern const struct inode_operations ecryptfs_main_iops; |
593 | extern const struct inode_operations ecryptfs_dir_iops; |
594 | extern const struct inode_operations ecryptfs_symlink_iops; |
595 | extern const struct super_operations ecryptfs_sops; |
596 | extern const struct dentry_operations ecryptfs_dops; |
597 | extern const struct address_space_operations ecryptfs_aops; |
598 | extern int ecryptfs_verbosity; |
599 | extern unsigned int ecryptfs_message_buf_len; |
600 | extern signed long ecryptfs_message_wait_timeout; |
601 | extern unsigned int ecryptfs_number_of_users; |
602 | |
603 | extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache; |
604 | extern struct kmem_cache *ecryptfs_file_info_cache; |
605 | extern struct kmem_cache *ecryptfs_dentry_info_cache; |
606 | extern struct kmem_cache *ecryptfs_inode_info_cache; |
607 | extern struct kmem_cache *ecryptfs_sb_info_cache; |
608 | extern struct kmem_cache *ecryptfs_header_cache; |
609 | extern struct kmem_cache *ecryptfs_xattr_cache; |
610 | extern struct kmem_cache *ecryptfs_key_record_cache; |
611 | extern struct kmem_cache *ecryptfs_key_sig_cache; |
612 | extern struct kmem_cache *ecryptfs_global_auth_tok_cache; |
613 | extern struct kmem_cache *ecryptfs_key_tfm_cache; |
614 | extern struct kmem_cache *ecryptfs_open_req_cache; |
615 | |
616 | struct ecryptfs_open_req { |
617 | #define ECRYPTFS_REQ_PROCESSED 0x00000001 |
618 | #define ECRYPTFS_REQ_DROPPED 0x00000002 |
619 | #define ECRYPTFS_REQ_ZOMBIE 0x00000004 |
620 | u32 flags; |
621 | struct file **lower_file; |
622 | struct dentry *lower_dentry; |
623 | struct vfsmount *lower_mnt; |
624 | wait_queue_head_t wait; |
625 | struct mutex mux; |
626 | struct list_head kthread_ctl_list; |
627 | }; |
628 | |
629 | struct inode *ecryptfs_get_inode(struct inode *lower_inode, |
630 | struct super_block *sb); |
631 | void ecryptfs_i_size_init(const char *page_virt, struct inode *inode); |
632 | int ecryptfs_decode_and_decrypt_filename(char **decrypted_name, |
633 | size_t *decrypted_name_size, |
634 | struct dentry *ecryptfs_dentry, |
635 | const char *name, size_t name_size); |
636 | int ecryptfs_fill_zeros(struct file *file, loff_t new_length); |
637 | int ecryptfs_encrypt_and_encode_filename( |
638 | char **encoded_name, |
639 | size_t *encoded_name_size, |
640 | struct ecryptfs_crypt_stat *crypt_stat, |
641 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat, |
642 | const char *name, size_t name_size); |
643 | struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry); |
644 | void ecryptfs_dump_hex(char *data, int bytes); |
645 | int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg, |
646 | int sg_size); |
647 | int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat); |
648 | void ecryptfs_rotate_iv(unsigned char *iv); |
649 | void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); |
650 | void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); |
651 | void ecryptfs_destroy_mount_crypt_stat( |
652 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat); |
653 | int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat); |
654 | int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode); |
655 | int ecryptfs_encrypt_page(struct page *page); |
656 | int ecryptfs_decrypt_page(struct page *page); |
657 | int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry); |
658 | int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry); |
659 | int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry); |
660 | void ecryptfs_write_crypt_stat_flags(char *page_virt, |
661 | struct ecryptfs_crypt_stat *crypt_stat, |
662 | size_t *written); |
663 | int ecryptfs_read_and_validate_header_region(struct inode *inode); |
664 | int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry, |
665 | struct inode *inode); |
666 | u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes); |
667 | int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code); |
668 | void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat); |
669 | int ecryptfs_generate_key_packet_set(char *dest_base, |
670 | struct ecryptfs_crypt_stat *crypt_stat, |
671 | struct dentry *ecryptfs_dentry, |
672 | size_t *len, size_t max); |
673 | int |
674 | ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat, |
675 | unsigned char *src, struct dentry *ecryptfs_dentry); |
676 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length); |
677 | ssize_t |
678 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, |
679 | void *value, size_t size); |
680 | int |
681 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
682 | size_t size, int flags); |
683 | int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode); |
684 | int ecryptfs_process_helo(uid_t euid, struct user_namespace *user_ns, |
685 | struct pid *pid); |
686 | int ecryptfs_process_quit(uid_t euid, struct user_namespace *user_ns, |
687 | struct pid *pid); |
688 | int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid, |
689 | struct user_namespace *user_ns, struct pid *pid, |
690 | u32 seq); |
691 | int ecryptfs_send_message(char *data, int data_len, |
692 | struct ecryptfs_msg_ctx **msg_ctx); |
693 | int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx, |
694 | struct ecryptfs_message **emsg); |
695 | int ecryptfs_init_messaging(void); |
696 | void ecryptfs_release_messaging(void); |
697 | |
698 | void |
699 | ecryptfs_write_header_metadata(char *virt, |
700 | struct ecryptfs_crypt_stat *crypt_stat, |
701 | size_t *written); |
702 | int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig); |
703 | int |
704 | ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat, |
705 | char *sig, u32 global_auth_tok_flags); |
706 | int ecryptfs_get_global_auth_tok_for_sig( |
707 | struct ecryptfs_global_auth_tok **global_auth_tok, |
708 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig); |
709 | int |
710 | ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name, |
711 | size_t key_size); |
712 | int ecryptfs_init_crypto(void); |
713 | int ecryptfs_destroy_crypto(void); |
714 | int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm); |
715 | int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm, |
716 | struct mutex **tfm_mutex, |
717 | char *cipher_name); |
718 | int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key, |
719 | struct ecryptfs_auth_tok **auth_tok, |
720 | char *sig); |
721 | int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data, |
722 | loff_t offset, size_t size); |
723 | int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode, |
724 | struct page *page_for_lower, |
725 | size_t offset_in_page, size_t size); |
726 | int ecryptfs_write(struct inode *inode, char *data, loff_t offset, size_t size); |
727 | int ecryptfs_read_lower(char *data, loff_t offset, size_t size, |
728 | struct inode *ecryptfs_inode); |
729 | int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs, |
730 | pgoff_t page_index, |
731 | size_t offset_in_page, size_t size, |
732 | struct inode *ecryptfs_inode); |
733 | struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index); |
734 | int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon); |
735 | int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon, uid_t euid, |
736 | struct user_namespace *user_ns); |
737 | int ecryptfs_parse_packet_length(unsigned char *data, size_t *size, |
738 | size_t *length_size); |
739 | int ecryptfs_write_packet_length(char *dest, size_t size, |
740 | size_t *packet_size_length); |
741 | int ecryptfs_init_ecryptfs_miscdev(void); |
742 | void ecryptfs_destroy_ecryptfs_miscdev(void); |
743 | int ecryptfs_send_miscdev(char *data, size_t data_size, |
744 | struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type, |
745 | u16 msg_flags, struct ecryptfs_daemon *daemon); |
746 | void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx); |
747 | int |
748 | ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, uid_t euid, |
749 | struct user_namespace *user_ns, struct pid *pid); |
750 | int ecryptfs_init_kthread(void); |
751 | void ecryptfs_destroy_kthread(void); |
752 | int ecryptfs_privileged_open(struct file **lower_file, |
753 | struct dentry *lower_dentry, |
754 | struct vfsmount *lower_mnt, |
755 | const struct cred *cred); |
756 | int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode); |
757 | void ecryptfs_put_lower_file(struct inode *inode); |
758 | int |
759 | ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes, |
760 | size_t *packet_size, |
761 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat, |
762 | char *filename, size_t filename_size); |
763 | int |
764 | ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size, |
765 | size_t *packet_size, |
766 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat, |
767 | char *data, size_t max_packet_size); |
768 | int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat, |
769 | loff_t offset); |
770 | |
771 | #endif /* #ifndef ECRYPTFS_KERNEL_H */ |
772 |
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