Commit | Line | Data |
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237fead6 MH |
1 | /** |
2 | * eCryptfs: Linux filesystem encryption layer | |
3 | * In-kernel key management code. Includes functions to parse and | |
4 | * write authentication token-related packets with the underlying | |
5 | * file. | |
6 | * | |
7 | * Copyright (C) 2004-2006 International Business Machines Corp. | |
8 | * Author(s): Michael A. Halcrow <mhalcrow@us.ibm.com> | |
9 | * Michael C. Thompson <mcthomps@us.ibm.com> | |
dddfa461 | 10 | * Trevor S. Highland <trevor.highland@gmail.com> |
237fead6 MH |
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 | #include <linux/string.h> | |
237fead6 MH |
29 | #include <linux/syscalls.h> |
30 | #include <linux/pagemap.h> | |
31 | #include <linux/key.h> | |
32 | #include <linux/random.h> | |
33 | #include <linux/crypto.h> | |
34 | #include <linux/scatterlist.h> | |
35 | #include "ecryptfs_kernel.h" | |
36 | ||
37 | /** | |
38 | * request_key returned an error instead of a valid key address; | |
39 | * determine the type of error, make appropriate log entries, and | |
40 | * return an error code. | |
41 | */ | |
42 | int process_request_key_err(long err_code) | |
43 | { | |
44 | int rc = 0; | |
45 | ||
46 | switch (err_code) { | |
47 | case ENOKEY: | |
48 | ecryptfs_printk(KERN_WARNING, "No key\n"); | |
49 | rc = -ENOENT; | |
50 | break; | |
51 | case EKEYEXPIRED: | |
52 | ecryptfs_printk(KERN_WARNING, "Key expired\n"); | |
53 | rc = -ETIME; | |
54 | break; | |
55 | case EKEYREVOKED: | |
56 | ecryptfs_printk(KERN_WARNING, "Key revoked\n"); | |
57 | rc = -EINVAL; | |
58 | break; | |
59 | default: | |
60 | ecryptfs_printk(KERN_WARNING, "Unknown error code: " | |
61 | "[0x%.16x]\n", err_code); | |
62 | rc = -EINVAL; | |
63 | } | |
64 | return rc; | |
65 | } | |
66 | ||
237fead6 MH |
67 | /** |
68 | * parse_packet_length | |
69 | * @data: Pointer to memory containing length at offset | |
70 | * @size: This function writes the decoded size to this memory | |
71 | * address; zero on error | |
72 | * @length_size: The number of bytes occupied by the encoded length | |
73 | * | |
74 | * Returns Zero on success | |
75 | */ | |
76 | static int parse_packet_length(unsigned char *data, size_t *size, | |
77 | size_t *length_size) | |
78 | { | |
79 | int rc = 0; | |
80 | ||
81 | (*length_size) = 0; | |
82 | (*size) = 0; | |
83 | if (data[0] < 192) { | |
84 | /* One-byte length */ | |
dddfa461 | 85 | (*size) = (unsigned char)data[0]; |
237fead6 MH |
86 | (*length_size) = 1; |
87 | } else if (data[0] < 224) { | |
88 | /* Two-byte length */ | |
dddfa461 MH |
89 | (*size) = (((unsigned char)(data[0]) - 192) * 256); |
90 | (*size) += ((unsigned char)(data[1]) + 192); | |
237fead6 MH |
91 | (*length_size) = 2; |
92 | } else if (data[0] == 255) { | |
93 | /* Five-byte length; we're not supposed to see this */ | |
94 | ecryptfs_printk(KERN_ERR, "Five-byte packet length not " | |
95 | "supported\n"); | |
96 | rc = -EINVAL; | |
97 | goto out; | |
98 | } else { | |
99 | ecryptfs_printk(KERN_ERR, "Error parsing packet length\n"); | |
100 | rc = -EINVAL; | |
101 | goto out; | |
102 | } | |
103 | out: | |
104 | return rc; | |
105 | } | |
106 | ||
107 | /** | |
108 | * write_packet_length | |
109 | * @dest: The byte array target into which to write the | |
110 | * length. Must have at least 5 bytes allocated. | |
111 | * @size: The length to write. | |
112 | * @packet_size_length: The number of bytes used to encode the | |
113 | * packet length is written to this address. | |
114 | * | |
115 | * Returns zero on success; non-zero on error. | |
116 | */ | |
117 | static int write_packet_length(char *dest, size_t size, | |
118 | size_t *packet_size_length) | |
119 | { | |
120 | int rc = 0; | |
121 | ||
122 | if (size < 192) { | |
123 | dest[0] = size; | |
124 | (*packet_size_length) = 1; | |
125 | } else if (size < 65536) { | |
126 | dest[0] = (((size - 192) / 256) + 192); | |
127 | dest[1] = ((size - 192) % 256); | |
128 | (*packet_size_length) = 2; | |
129 | } else { | |
130 | rc = -EINVAL; | |
131 | ecryptfs_printk(KERN_WARNING, | |
132 | "Unsupported packet size: [%d]\n", size); | |
133 | } | |
134 | return rc; | |
135 | } | |
136 | ||
dddfa461 MH |
137 | static int |
138 | write_tag_64_packet(char *signature, struct ecryptfs_session_key *session_key, | |
139 | char **packet, size_t *packet_len) | |
140 | { | |
141 | size_t i = 0; | |
142 | size_t data_len; | |
143 | size_t packet_size_len; | |
144 | char *message; | |
145 | int rc; | |
146 | ||
147 | /* | |
148 | * ***** TAG 64 Packet Format ***** | |
149 | * | Content Type | 1 byte | | |
150 | * | Key Identifier Size | 1 or 2 bytes | | |
151 | * | Key Identifier | arbitrary | | |
152 | * | Encrypted File Encryption Key Size | 1 or 2 bytes | | |
153 | * | Encrypted File Encryption Key | arbitrary | | |
154 | */ | |
155 | data_len = (5 + ECRYPTFS_SIG_SIZE_HEX | |
156 | + session_key->encrypted_key_size); | |
157 | *packet = kmalloc(data_len, GFP_KERNEL); | |
158 | message = *packet; | |
159 | if (!message) { | |
160 | ecryptfs_printk(KERN_ERR, "Unable to allocate memory\n"); | |
161 | rc = -ENOMEM; | |
162 | goto out; | |
163 | } | |
164 | message[i++] = ECRYPTFS_TAG_64_PACKET_TYPE; | |
165 | rc = write_packet_length(&message[i], ECRYPTFS_SIG_SIZE_HEX, | |
166 | &packet_size_len); | |
167 | if (rc) { | |
168 | ecryptfs_printk(KERN_ERR, "Error generating tag 64 packet " | |
169 | "header; cannot generate packet length\n"); | |
170 | goto out; | |
171 | } | |
172 | i += packet_size_len; | |
173 | memcpy(&message[i], signature, ECRYPTFS_SIG_SIZE_HEX); | |
174 | i += ECRYPTFS_SIG_SIZE_HEX; | |
175 | rc = write_packet_length(&message[i], session_key->encrypted_key_size, | |
176 | &packet_size_len); | |
177 | if (rc) { | |
178 | ecryptfs_printk(KERN_ERR, "Error generating tag 64 packet " | |
179 | "header; cannot generate packet length\n"); | |
180 | goto out; | |
181 | } | |
182 | i += packet_size_len; | |
183 | memcpy(&message[i], session_key->encrypted_key, | |
184 | session_key->encrypted_key_size); | |
185 | i += session_key->encrypted_key_size; | |
186 | *packet_len = i; | |
187 | out: | |
188 | return rc; | |
189 | } | |
190 | ||
191 | static int | |
192 | parse_tag_65_packet(struct ecryptfs_session_key *session_key, u16 *cipher_code, | |
193 | struct ecryptfs_message *msg) | |
194 | { | |
195 | size_t i = 0; | |
196 | char *data; | |
197 | size_t data_len; | |
198 | size_t m_size; | |
199 | size_t message_len; | |
200 | u16 checksum = 0; | |
201 | u16 expected_checksum = 0; | |
202 | int rc; | |
203 | ||
204 | /* | |
205 | * ***** TAG 65 Packet Format ***** | |
206 | * | Content Type | 1 byte | | |
207 | * | Status Indicator | 1 byte | | |
208 | * | File Encryption Key Size | 1 or 2 bytes | | |
209 | * | File Encryption Key | arbitrary | | |
210 | */ | |
211 | message_len = msg->data_len; | |
212 | data = msg->data; | |
213 | if (message_len < 4) { | |
214 | rc = -EIO; | |
215 | goto out; | |
216 | } | |
217 | if (data[i++] != ECRYPTFS_TAG_65_PACKET_TYPE) { | |
218 | ecryptfs_printk(KERN_ERR, "Type should be ECRYPTFS_TAG_65\n"); | |
219 | rc = -EIO; | |
220 | goto out; | |
221 | } | |
222 | if (data[i++]) { | |
223 | ecryptfs_printk(KERN_ERR, "Status indicator has non-zero value " | |
224 | "[%d]\n", data[i-1]); | |
225 | rc = -EIO; | |
226 | goto out; | |
227 | } | |
228 | rc = parse_packet_length(&data[i], &m_size, &data_len); | |
229 | if (rc) { | |
230 | ecryptfs_printk(KERN_WARNING, "Error parsing packet length; " | |
231 | "rc = [%d]\n", rc); | |
232 | goto out; | |
233 | } | |
234 | i += data_len; | |
235 | if (message_len < (i + m_size)) { | |
236 | ecryptfs_printk(KERN_ERR, "The received netlink message is " | |
237 | "shorter than expected\n"); | |
238 | rc = -EIO; | |
239 | goto out; | |
240 | } | |
241 | if (m_size < 3) { | |
242 | ecryptfs_printk(KERN_ERR, | |
243 | "The decrypted key is not long enough to " | |
244 | "include a cipher code and checksum\n"); | |
245 | rc = -EIO; | |
246 | goto out; | |
247 | } | |
248 | *cipher_code = data[i++]; | |
249 | /* The decrypted key includes 1 byte cipher code and 2 byte checksum */ | |
250 | session_key->decrypted_key_size = m_size - 3; | |
251 | if (session_key->decrypted_key_size > ECRYPTFS_MAX_KEY_BYTES) { | |
252 | ecryptfs_printk(KERN_ERR, "key_size [%d] larger than " | |
253 | "the maximum key size [%d]\n", | |
254 | session_key->decrypted_key_size, | |
255 | ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES); | |
256 | rc = -EIO; | |
257 | goto out; | |
258 | } | |
259 | memcpy(session_key->decrypted_key, &data[i], | |
260 | session_key->decrypted_key_size); | |
261 | i += session_key->decrypted_key_size; | |
262 | expected_checksum += (unsigned char)(data[i++]) << 8; | |
263 | expected_checksum += (unsigned char)(data[i++]); | |
264 | for (i = 0; i < session_key->decrypted_key_size; i++) | |
265 | checksum += session_key->decrypted_key[i]; | |
266 | if (expected_checksum != checksum) { | |
267 | ecryptfs_printk(KERN_ERR, "Invalid checksum for file " | |
268 | "encryption key; expected [%x]; calculated " | |
269 | "[%x]\n", expected_checksum, checksum); | |
270 | rc = -EIO; | |
271 | } | |
272 | out: | |
273 | return rc; | |
274 | } | |
275 | ||
276 | ||
277 | static int | |
278 | write_tag_66_packet(char *signature, size_t cipher_code, | |
279 | struct ecryptfs_crypt_stat *crypt_stat, char **packet, | |
280 | size_t *packet_len) | |
281 | { | |
282 | size_t i = 0; | |
283 | size_t j; | |
284 | size_t data_len; | |
285 | size_t checksum = 0; | |
286 | size_t packet_size_len; | |
287 | char *message; | |
288 | int rc; | |
289 | ||
290 | /* | |
291 | * ***** TAG 66 Packet Format ***** | |
292 | * | Content Type | 1 byte | | |
293 | * | Key Identifier Size | 1 or 2 bytes | | |
294 | * | Key Identifier | arbitrary | | |
295 | * | File Encryption Key Size | 1 or 2 bytes | | |
296 | * | File Encryption Key | arbitrary | | |
297 | */ | |
298 | data_len = (5 + ECRYPTFS_SIG_SIZE_HEX + crypt_stat->key_size); | |
299 | *packet = kmalloc(data_len, GFP_KERNEL); | |
300 | message = *packet; | |
301 | if (!message) { | |
302 | ecryptfs_printk(KERN_ERR, "Unable to allocate memory\n"); | |
303 | rc = -ENOMEM; | |
304 | goto out; | |
305 | } | |
306 | message[i++] = ECRYPTFS_TAG_66_PACKET_TYPE; | |
307 | rc = write_packet_length(&message[i], ECRYPTFS_SIG_SIZE_HEX, | |
308 | &packet_size_len); | |
309 | if (rc) { | |
310 | ecryptfs_printk(KERN_ERR, "Error generating tag 66 packet " | |
311 | "header; cannot generate packet length\n"); | |
312 | goto out; | |
313 | } | |
314 | i += packet_size_len; | |
315 | memcpy(&message[i], signature, ECRYPTFS_SIG_SIZE_HEX); | |
316 | i += ECRYPTFS_SIG_SIZE_HEX; | |
317 | /* The encrypted key includes 1 byte cipher code and 2 byte checksum */ | |
318 | rc = write_packet_length(&message[i], crypt_stat->key_size + 3, | |
319 | &packet_size_len); | |
320 | if (rc) { | |
321 | ecryptfs_printk(KERN_ERR, "Error generating tag 66 packet " | |
322 | "header; cannot generate packet length\n"); | |
323 | goto out; | |
324 | } | |
325 | i += packet_size_len; | |
326 | message[i++] = cipher_code; | |
327 | memcpy(&message[i], crypt_stat->key, crypt_stat->key_size); | |
328 | i += crypt_stat->key_size; | |
329 | for (j = 0; j < crypt_stat->key_size; j++) | |
330 | checksum += crypt_stat->key[j]; | |
331 | message[i++] = (checksum / 256) % 256; | |
332 | message[i++] = (checksum % 256); | |
333 | *packet_len = i; | |
334 | out: | |
335 | return rc; | |
336 | } | |
337 | ||
338 | static int | |
339 | parse_tag_67_packet(struct ecryptfs_key_record *key_rec, | |
340 | struct ecryptfs_message *msg) | |
341 | { | |
342 | size_t i = 0; | |
343 | char *data; | |
344 | size_t data_len; | |
345 | size_t message_len; | |
346 | int rc; | |
347 | ||
348 | /* | |
349 | * ***** TAG 65 Packet Format ***** | |
350 | * | Content Type | 1 byte | | |
351 | * | Status Indicator | 1 byte | | |
352 | * | Encrypted File Encryption Key Size | 1 or 2 bytes | | |
353 | * | Encrypted File Encryption Key | arbitrary | | |
354 | */ | |
355 | message_len = msg->data_len; | |
356 | data = msg->data; | |
357 | /* verify that everything through the encrypted FEK size is present */ | |
358 | if (message_len < 4) { | |
359 | rc = -EIO; | |
360 | goto out; | |
361 | } | |
362 | if (data[i++] != ECRYPTFS_TAG_67_PACKET_TYPE) { | |
363 | ecryptfs_printk(KERN_ERR, "Type should be ECRYPTFS_TAG_67\n"); | |
364 | rc = -EIO; | |
365 | goto out; | |
366 | } | |
367 | if (data[i++]) { | |
368 | ecryptfs_printk(KERN_ERR, "Status indicator has non zero value" | |
369 | " [%d]\n", data[i-1]); | |
370 | rc = -EIO; | |
371 | goto out; | |
372 | } | |
373 | rc = parse_packet_length(&data[i], &key_rec->enc_key_size, &data_len); | |
374 | if (rc) { | |
375 | ecryptfs_printk(KERN_WARNING, "Error parsing packet length; " | |
376 | "rc = [%d]\n", rc); | |
377 | goto out; | |
378 | } | |
379 | i += data_len; | |
380 | if (message_len < (i + key_rec->enc_key_size)) { | |
381 | ecryptfs_printk(KERN_ERR, "message_len [%d]; max len is [%d]\n", | |
382 | message_len, (i + key_rec->enc_key_size)); | |
383 | rc = -EIO; | |
384 | goto out; | |
385 | } | |
386 | if (key_rec->enc_key_size > ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES) { | |
387 | ecryptfs_printk(KERN_ERR, "Encrypted key_size [%d] larger than " | |
388 | "the maximum key size [%d]\n", | |
389 | key_rec->enc_key_size, | |
390 | ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES); | |
391 | rc = -EIO; | |
392 | goto out; | |
393 | } | |
394 | memcpy(key_rec->enc_key, &data[i], key_rec->enc_key_size); | |
395 | out: | |
396 | return rc; | |
397 | } | |
398 | ||
399 | /** | |
400 | * decrypt_pki_encrypted_session_key - Decrypt the session key with | |
401 | * the given auth_tok. | |
402 | * | |
403 | * Returns Zero on success; non-zero error otherwise. | |
404 | */ | |
f4aad16a MH |
405 | static int |
406 | decrypt_pki_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok, | |
407 | struct ecryptfs_crypt_stat *crypt_stat) | |
dddfa461 MH |
408 | { |
409 | u16 cipher_code = 0; | |
410 | struct ecryptfs_msg_ctx *msg_ctx; | |
411 | struct ecryptfs_message *msg = NULL; | |
f4aad16a | 412 | char *auth_tok_sig; |
dddfa461 MH |
413 | char *netlink_message; |
414 | size_t netlink_message_length; | |
415 | int rc; | |
416 | ||
f4aad16a MH |
417 | if ((rc = ecryptfs_get_auth_tok_sig(&auth_tok_sig, auth_tok))) { |
418 | printk(KERN_ERR "Unrecognized auth tok type: [%d]\n", | |
419 | auth_tok->token_type); | |
420 | goto out; | |
421 | } | |
422 | rc = write_tag_64_packet(auth_tok_sig, &(auth_tok->session_key), | |
dddfa461 MH |
423 | &netlink_message, &netlink_message_length); |
424 | if (rc) { | |
425 | ecryptfs_printk(KERN_ERR, "Failed to write tag 64 packet"); | |
426 | goto out; | |
427 | } | |
428 | rc = ecryptfs_send_message(ecryptfs_transport, netlink_message, | |
429 | netlink_message_length, &msg_ctx); | |
430 | if (rc) { | |
431 | ecryptfs_printk(KERN_ERR, "Error sending netlink message\n"); | |
432 | goto out; | |
433 | } | |
434 | rc = ecryptfs_wait_for_response(msg_ctx, &msg); | |
435 | if (rc) { | |
436 | ecryptfs_printk(KERN_ERR, "Failed to receive tag 65 packet " | |
437 | "from the user space daemon\n"); | |
438 | rc = -EIO; | |
439 | goto out; | |
440 | } | |
441 | rc = parse_tag_65_packet(&(auth_tok->session_key), | |
442 | &cipher_code, msg); | |
443 | if (rc) { | |
444 | printk(KERN_ERR "Failed to parse tag 65 packet; rc = [%d]\n", | |
445 | rc); | |
446 | goto out; | |
447 | } | |
448 | auth_tok->session_key.flags |= ECRYPTFS_CONTAINS_DECRYPTED_KEY; | |
449 | memcpy(crypt_stat->key, auth_tok->session_key.decrypted_key, | |
450 | auth_tok->session_key.decrypted_key_size); | |
451 | crypt_stat->key_size = auth_tok->session_key.decrypted_key_size; | |
452 | rc = ecryptfs_cipher_code_to_string(crypt_stat->cipher, cipher_code); | |
453 | if (rc) { | |
454 | ecryptfs_printk(KERN_ERR, "Cipher code [%d] is invalid\n", | |
455 | cipher_code) | |
456 | goto out; | |
457 | } | |
458 | crypt_stat->flags |= ECRYPTFS_KEY_VALID; | |
459 | if (ecryptfs_verbosity > 0) { | |
460 | ecryptfs_printk(KERN_DEBUG, "Decrypted session key:\n"); | |
461 | ecryptfs_dump_hex(crypt_stat->key, | |
462 | crypt_stat->key_size); | |
463 | } | |
464 | out: | |
465 | if (msg) | |
466 | kfree(msg); | |
467 | return rc; | |
468 | } | |
469 | ||
470 | static void wipe_auth_tok_list(struct list_head *auth_tok_list_head) | |
471 | { | |
472 | struct list_head *walker; | |
473 | struct ecryptfs_auth_tok_list_item *auth_tok_list_item; | |
474 | ||
475 | walker = auth_tok_list_head->next; | |
476 | while (walker != auth_tok_list_head) { | |
477 | auth_tok_list_item = | |
478 | list_entry(walker, struct ecryptfs_auth_tok_list_item, | |
479 | list); | |
480 | walker = auth_tok_list_item->list.next; | |
481 | memset(auth_tok_list_item, 0, | |
482 | sizeof(struct ecryptfs_auth_tok_list_item)); | |
483 | kmem_cache_free(ecryptfs_auth_tok_list_item_cache, | |
484 | auth_tok_list_item); | |
485 | } | |
486 | auth_tok_list_head->next = NULL; | |
487 | } | |
488 | ||
489 | struct kmem_cache *ecryptfs_auth_tok_list_item_cache; | |
490 | ||
491 | ||
492 | /** | |
493 | * parse_tag_1_packet | |
494 | * @crypt_stat: The cryptographic context to modify based on packet | |
495 | * contents. | |
496 | * @data: The raw bytes of the packet. | |
497 | * @auth_tok_list: eCryptfs parses packets into authentication tokens; | |
498 | * a new authentication token will be placed at the end | |
499 | * of this list for this packet. | |
500 | * @new_auth_tok: Pointer to a pointer to memory that this function | |
501 | * allocates; sets the memory address of the pointer to | |
502 | * NULL on error. This object is added to the | |
503 | * auth_tok_list. | |
504 | * @packet_size: This function writes the size of the parsed packet | |
505 | * into this memory location; zero on error. | |
506 | * | |
507 | * Returns zero on success; non-zero on error. | |
508 | */ | |
509 | static int | |
510 | parse_tag_1_packet(struct ecryptfs_crypt_stat *crypt_stat, | |
511 | unsigned char *data, struct list_head *auth_tok_list, | |
512 | struct ecryptfs_auth_tok **new_auth_tok, | |
513 | size_t *packet_size, size_t max_packet_size) | |
514 | { | |
515 | size_t body_size; | |
516 | struct ecryptfs_auth_tok_list_item *auth_tok_list_item; | |
517 | size_t length_size; | |
518 | int rc = 0; | |
519 | ||
520 | (*packet_size) = 0; | |
521 | (*new_auth_tok) = NULL; | |
522 | ||
523 | /* we check that: | |
524 | * one byte for the Tag 1 ID flag | |
525 | * two bytes for the body size | |
526 | * do not exceed the maximum_packet_size | |
527 | */ | |
528 | if (unlikely((*packet_size) + 3 > max_packet_size)) { | |
529 | ecryptfs_printk(KERN_ERR, "Packet size exceeds max\n"); | |
530 | rc = -EINVAL; | |
531 | goto out; | |
532 | } | |
533 | /* check for Tag 1 identifier - one byte */ | |
534 | if (data[(*packet_size)++] != ECRYPTFS_TAG_1_PACKET_TYPE) { | |
535 | ecryptfs_printk(KERN_ERR, "Enter w/ first byte != 0x%.2x\n", | |
536 | ECRYPTFS_TAG_1_PACKET_TYPE); | |
537 | rc = -EINVAL; | |
538 | goto out; | |
539 | } | |
540 | /* Released: wipe_auth_tok_list called in ecryptfs_parse_packet_set or | |
541 | * at end of function upon failure */ | |
542 | auth_tok_list_item = | |
543 | kmem_cache_alloc(ecryptfs_auth_tok_list_item_cache, | |
544 | GFP_KERNEL); | |
545 | if (!auth_tok_list_item) { | |
546 | ecryptfs_printk(KERN_ERR, "Unable to allocate memory\n"); | |
547 | rc = -ENOMEM; | |
548 | goto out; | |
549 | } | |
550 | memset(auth_tok_list_item, 0, | |
551 | sizeof(struct ecryptfs_auth_tok_list_item)); | |
552 | (*new_auth_tok) = &auth_tok_list_item->auth_tok; | |
553 | /* check for body size - one to two bytes | |
554 | * | |
555 | * ***** TAG 1 Packet Format ***** | |
556 | * | version number | 1 byte | | |
557 | * | key ID | 8 bytes | | |
558 | * | public key algorithm | 1 byte | | |
559 | * | encrypted session key | arbitrary | | |
560 | */ | |
561 | rc = parse_packet_length(&data[(*packet_size)], &body_size, | |
562 | &length_size); | |
563 | if (rc) { | |
564 | ecryptfs_printk(KERN_WARNING, "Error parsing packet length; " | |
565 | "rc = [%d]\n", rc); | |
566 | goto out_free; | |
567 | } | |
568 | if (unlikely(body_size < (0x02 + ECRYPTFS_SIG_SIZE))) { | |
569 | ecryptfs_printk(KERN_WARNING, "Invalid body size ([%d])\n", | |
570 | body_size); | |
571 | rc = -EINVAL; | |
572 | goto out_free; | |
573 | } | |
574 | (*packet_size) += length_size; | |
575 | if (unlikely((*packet_size) + body_size > max_packet_size)) { | |
576 | ecryptfs_printk(KERN_ERR, "Packet size exceeds max\n"); | |
577 | rc = -EINVAL; | |
578 | goto out_free; | |
579 | } | |
580 | /* Version 3 (from RFC2440) - one byte */ | |
581 | if (unlikely(data[(*packet_size)++] != 0x03)) { | |
582 | ecryptfs_printk(KERN_DEBUG, "Unknown version number " | |
583 | "[%d]\n", data[(*packet_size) - 1]); | |
584 | rc = -EINVAL; | |
585 | goto out_free; | |
586 | } | |
587 | /* Read Signature */ | |
588 | ecryptfs_to_hex((*new_auth_tok)->token.private_key.signature, | |
589 | &data[(*packet_size)], ECRYPTFS_SIG_SIZE); | |
590 | *packet_size += ECRYPTFS_SIG_SIZE; | |
591 | /* This byte is skipped because the kernel does not need to | |
592 | * know which public key encryption algorithm was used */ | |
593 | (*packet_size)++; | |
594 | (*new_auth_tok)->session_key.encrypted_key_size = | |
595 | body_size - (0x02 + ECRYPTFS_SIG_SIZE); | |
596 | if ((*new_auth_tok)->session_key.encrypted_key_size | |
597 | > ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES) { | |
598 | ecryptfs_printk(KERN_ERR, "Tag 1 packet contains key larger " | |
599 | "than ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES"); | |
600 | rc = -EINVAL; | |
601 | goto out; | |
602 | } | |
603 | ecryptfs_printk(KERN_DEBUG, "Encrypted key size = [%d]\n", | |
604 | (*new_auth_tok)->session_key.encrypted_key_size); | |
605 | memcpy((*new_auth_tok)->session_key.encrypted_key, | |
606 | &data[(*packet_size)], (body_size - 0x02 - ECRYPTFS_SIG_SIZE)); | |
607 | (*packet_size) += (*new_auth_tok)->session_key.encrypted_key_size; | |
608 | (*new_auth_tok)->session_key.flags &= | |
609 | ~ECRYPTFS_CONTAINS_DECRYPTED_KEY; | |
610 | (*new_auth_tok)->session_key.flags |= | |
611 | ECRYPTFS_CONTAINS_ENCRYPTED_KEY; | |
612 | (*new_auth_tok)->token_type = ECRYPTFS_PRIVATE_KEY; | |
e2bd99ec | 613 | (*new_auth_tok)->flags |= ECRYPTFS_PRIVATE_KEY; |
dddfa461 MH |
614 | /* TODO: Why are we setting this flag here? Don't we want the |
615 | * userspace to decrypt the session key? */ | |
e2bd99ec MH |
616 | (*new_auth_tok)->session_key.flags &= |
617 | ~(ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT); | |
618 | (*new_auth_tok)->session_key.flags &= | |
619 | ~(ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT); | |
dddfa461 MH |
620 | list_add(&auth_tok_list_item->list, auth_tok_list); |
621 | goto out; | |
622 | out_free: | |
623 | (*new_auth_tok) = NULL; | |
624 | memset(auth_tok_list_item, 0, | |
625 | sizeof(struct ecryptfs_auth_tok_list_item)); | |
626 | kmem_cache_free(ecryptfs_auth_tok_list_item_cache, | |
627 | auth_tok_list_item); | |
628 | out: | |
629 | if (rc) | |
630 | (*packet_size) = 0; | |
631 | return rc; | |
632 | } | |
633 | ||
237fead6 MH |
634 | /** |
635 | * parse_tag_3_packet | |
636 | * @crypt_stat: The cryptographic context to modify based on packet | |
637 | * contents. | |
638 | * @data: The raw bytes of the packet. | |
639 | * @auth_tok_list: eCryptfs parses packets into authentication tokens; | |
640 | * a new authentication token will be placed at the end | |
641 | * of this list for this packet. | |
642 | * @new_auth_tok: Pointer to a pointer to memory that this function | |
643 | * allocates; sets the memory address of the pointer to | |
644 | * NULL on error. This object is added to the | |
645 | * auth_tok_list. | |
646 | * @packet_size: This function writes the size of the parsed packet | |
647 | * into this memory location; zero on error. | |
648 | * @max_packet_size: maximum number of bytes to parse | |
649 | * | |
650 | * Returns zero on success; non-zero on error. | |
651 | */ | |
652 | static int | |
653 | parse_tag_3_packet(struct ecryptfs_crypt_stat *crypt_stat, | |
654 | unsigned char *data, struct list_head *auth_tok_list, | |
655 | struct ecryptfs_auth_tok **new_auth_tok, | |
656 | size_t *packet_size, size_t max_packet_size) | |
657 | { | |
237fead6 MH |
658 | size_t body_size; |
659 | struct ecryptfs_auth_tok_list_item *auth_tok_list_item; | |
660 | size_t length_size; | |
dddfa461 | 661 | int rc = 0; |
237fead6 MH |
662 | |
663 | (*packet_size) = 0; | |
664 | (*new_auth_tok) = NULL; | |
665 | ||
666 | /* we check that: | |
667 | * one byte for the Tag 3 ID flag | |
668 | * two bytes for the body size | |
669 | * do not exceed the maximum_packet_size | |
670 | */ | |
671 | if (unlikely((*packet_size) + 3 > max_packet_size)) { | |
672 | ecryptfs_printk(KERN_ERR, "Packet size exceeds max\n"); | |
673 | rc = -EINVAL; | |
674 | goto out; | |
675 | } | |
676 | ||
677 | /* check for Tag 3 identifyer - one byte */ | |
678 | if (data[(*packet_size)++] != ECRYPTFS_TAG_3_PACKET_TYPE) { | |
679 | ecryptfs_printk(KERN_ERR, "Enter w/ first byte != 0x%.2x\n", | |
680 | ECRYPTFS_TAG_3_PACKET_TYPE); | |
681 | rc = -EINVAL; | |
682 | goto out; | |
683 | } | |
684 | /* Released: wipe_auth_tok_list called in ecryptfs_parse_packet_set or | |
685 | * at end of function upon failure */ | |
686 | auth_tok_list_item = | |
c3762229 | 687 | kmem_cache_zalloc(ecryptfs_auth_tok_list_item_cache, GFP_KERNEL); |
237fead6 MH |
688 | if (!auth_tok_list_item) { |
689 | ecryptfs_printk(KERN_ERR, "Unable to allocate memory\n"); | |
690 | rc = -ENOMEM; | |
691 | goto out; | |
692 | } | |
237fead6 MH |
693 | (*new_auth_tok) = &auth_tok_list_item->auth_tok; |
694 | ||
695 | /* check for body size - one to two bytes */ | |
696 | rc = parse_packet_length(&data[(*packet_size)], &body_size, | |
697 | &length_size); | |
698 | if (rc) { | |
699 | ecryptfs_printk(KERN_WARNING, "Error parsing packet length; " | |
700 | "rc = [%d]\n", rc); | |
701 | goto out_free; | |
702 | } | |
703 | if (unlikely(body_size < (0x05 + ECRYPTFS_SALT_SIZE))) { | |
704 | ecryptfs_printk(KERN_WARNING, "Invalid body size ([%d])\n", | |
705 | body_size); | |
706 | rc = -EINVAL; | |
707 | goto out_free; | |
708 | } | |
709 | (*packet_size) += length_size; | |
710 | ||
711 | /* now we know the length of the remainting Tag 3 packet size: | |
712 | * 5 fix bytes for: version string, cipher, S2K ID, hash algo, | |
713 | * number of hash iterations | |
714 | * ECRYPTFS_SALT_SIZE bytes for salt | |
715 | * body_size bytes minus the stuff above is the encrypted key size | |
716 | */ | |
717 | if (unlikely((*packet_size) + body_size > max_packet_size)) { | |
718 | ecryptfs_printk(KERN_ERR, "Packet size exceeds max\n"); | |
719 | rc = -EINVAL; | |
720 | goto out_free; | |
721 | } | |
722 | ||
723 | /* There are 5 characters of additional information in the | |
724 | * packet */ | |
725 | (*new_auth_tok)->session_key.encrypted_key_size = | |
726 | body_size - (0x05 + ECRYPTFS_SALT_SIZE); | |
727 | ecryptfs_printk(KERN_DEBUG, "Encrypted key size = [%d]\n", | |
728 | (*new_auth_tok)->session_key.encrypted_key_size); | |
729 | ||
730 | /* Version 4 (from RFC2440) - one byte */ | |
731 | if (unlikely(data[(*packet_size)++] != 0x04)) { | |
732 | ecryptfs_printk(KERN_DEBUG, "Unknown version number " | |
733 | "[%d]\n", data[(*packet_size) - 1]); | |
734 | rc = -EINVAL; | |
735 | goto out_free; | |
736 | } | |
737 | ||
738 | /* cipher - one byte */ | |
739 | ecryptfs_cipher_code_to_string(crypt_stat->cipher, | |
740 | (u16)data[(*packet_size)]); | |
741 | /* A little extra work to differentiate among the AES key | |
742 | * sizes; see RFC2440 */ | |
743 | switch(data[(*packet_size)++]) { | |
744 | case RFC2440_CIPHER_AES_192: | |
745 | crypt_stat->key_size = 24; | |
746 | break; | |
747 | default: | |
748 | crypt_stat->key_size = | |
749 | (*new_auth_tok)->session_key.encrypted_key_size; | |
750 | } | |
751 | ecryptfs_init_crypt_ctx(crypt_stat); | |
752 | /* S2K identifier 3 (from RFC2440) */ | |
753 | if (unlikely(data[(*packet_size)++] != 0x03)) { | |
754 | ecryptfs_printk(KERN_ERR, "Only S2K ID 3 is currently " | |
755 | "supported\n"); | |
756 | rc = -ENOSYS; | |
757 | goto out_free; | |
758 | } | |
759 | ||
760 | /* TODO: finish the hash mapping */ | |
761 | /* hash algorithm - one byte */ | |
762 | switch (data[(*packet_size)++]) { | |
763 | case 0x01: /* See RFC2440 for these numbers and their mappings */ | |
764 | /* Choose MD5 */ | |
765 | /* salt - ECRYPTFS_SALT_SIZE bytes */ | |
766 | memcpy((*new_auth_tok)->token.password.salt, | |
767 | &data[(*packet_size)], ECRYPTFS_SALT_SIZE); | |
768 | (*packet_size) += ECRYPTFS_SALT_SIZE; | |
769 | ||
770 | /* This conversion was taken straight from RFC2440 */ | |
771 | /* number of hash iterations - one byte */ | |
772 | (*new_auth_tok)->token.password.hash_iterations = | |
773 | ((u32) 16 + (data[(*packet_size)] & 15)) | |
774 | << ((data[(*packet_size)] >> 4) + 6); | |
775 | (*packet_size)++; | |
776 | ||
777 | /* encrypted session key - | |
778 | * (body_size-5-ECRYPTFS_SALT_SIZE) bytes */ | |
779 | memcpy((*new_auth_tok)->session_key.encrypted_key, | |
780 | &data[(*packet_size)], | |
781 | (*new_auth_tok)->session_key.encrypted_key_size); | |
782 | (*packet_size) += | |
783 | (*new_auth_tok)->session_key.encrypted_key_size; | |
784 | (*new_auth_tok)->session_key.flags &= | |
785 | ~ECRYPTFS_CONTAINS_DECRYPTED_KEY; | |
786 | (*new_auth_tok)->session_key.flags |= | |
787 | ECRYPTFS_CONTAINS_ENCRYPTED_KEY; | |
788 | (*new_auth_tok)->token.password.hash_algo = 0x01; | |
789 | break; | |
790 | default: | |
791 | ecryptfs_printk(KERN_ERR, "Unsupported hash algorithm: " | |
792 | "[%d]\n", data[(*packet_size) - 1]); | |
793 | rc = -ENOSYS; | |
794 | goto out_free; | |
795 | } | |
796 | (*new_auth_tok)->token_type = ECRYPTFS_PASSWORD; | |
797 | /* TODO: Parametarize; we might actually want userspace to | |
798 | * decrypt the session key. */ | |
e2bd99ec MH |
799 | (*new_auth_tok)->session_key.flags &= |
800 | ~(ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT); | |
801 | (*new_auth_tok)->session_key.flags &= | |
802 | ~(ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT); | |
237fead6 MH |
803 | list_add(&auth_tok_list_item->list, auth_tok_list); |
804 | goto out; | |
805 | out_free: | |
806 | (*new_auth_tok) = NULL; | |
807 | memset(auth_tok_list_item, 0, | |
808 | sizeof(struct ecryptfs_auth_tok_list_item)); | |
809 | kmem_cache_free(ecryptfs_auth_tok_list_item_cache, | |
810 | auth_tok_list_item); | |
811 | out: | |
812 | if (rc) | |
813 | (*packet_size) = 0; | |
814 | return rc; | |
815 | } | |
816 | ||
817 | /** | |
818 | * parse_tag_11_packet | |
819 | * @data: The raw bytes of the packet | |
820 | * @contents: This function writes the data contents of the literal | |
821 | * packet into this memory location | |
822 | * @max_contents_bytes: The maximum number of bytes that this function | |
823 | * is allowed to write into contents | |
824 | * @tag_11_contents_size: This function writes the size of the parsed | |
825 | * contents into this memory location; zero on | |
826 | * error | |
827 | * @packet_size: This function writes the size of the parsed packet | |
828 | * into this memory location; zero on error | |
829 | * @max_packet_size: maximum number of bytes to parse | |
830 | * | |
831 | * Returns zero on success; non-zero on error. | |
832 | */ | |
833 | static int | |
834 | parse_tag_11_packet(unsigned char *data, unsigned char *contents, | |
835 | size_t max_contents_bytes, size_t *tag_11_contents_size, | |
836 | size_t *packet_size, size_t max_packet_size) | |
837 | { | |
237fead6 MH |
838 | size_t body_size; |
839 | size_t length_size; | |
dddfa461 | 840 | int rc = 0; |
237fead6 MH |
841 | |
842 | (*packet_size) = 0; | |
843 | (*tag_11_contents_size) = 0; | |
844 | ||
845 | /* check that: | |
846 | * one byte for the Tag 11 ID flag | |
847 | * two bytes for the Tag 11 length | |
848 | * do not exceed the maximum_packet_size | |
849 | */ | |
850 | if (unlikely((*packet_size) + 3 > max_packet_size)) { | |
851 | ecryptfs_printk(KERN_ERR, "Packet size exceeds max\n"); | |
852 | rc = -EINVAL; | |
853 | goto out; | |
854 | } | |
855 | ||
856 | /* check for Tag 11 identifyer - one byte */ | |
857 | if (data[(*packet_size)++] != ECRYPTFS_TAG_11_PACKET_TYPE) { | |
858 | ecryptfs_printk(KERN_WARNING, | |
859 | "Invalid tag 11 packet format\n"); | |
860 | rc = -EINVAL; | |
861 | goto out; | |
862 | } | |
863 | ||
864 | /* get Tag 11 content length - one or two bytes */ | |
865 | rc = parse_packet_length(&data[(*packet_size)], &body_size, | |
866 | &length_size); | |
867 | if (rc) { | |
868 | ecryptfs_printk(KERN_WARNING, | |
869 | "Invalid tag 11 packet format\n"); | |
870 | goto out; | |
871 | } | |
872 | (*packet_size) += length_size; | |
873 | ||
874 | if (body_size < 13) { | |
875 | ecryptfs_printk(KERN_WARNING, "Invalid body size ([%d])\n", | |
876 | body_size); | |
877 | rc = -EINVAL; | |
878 | goto out; | |
879 | } | |
880 | /* We have 13 bytes of surrounding packet values */ | |
881 | (*tag_11_contents_size) = (body_size - 13); | |
882 | ||
883 | /* now we know the length of the remainting Tag 11 packet size: | |
884 | * 14 fix bytes for: special flag one, special flag two, | |
885 | * 12 skipped bytes | |
886 | * body_size bytes minus the stuff above is the Tag 11 content | |
887 | */ | |
888 | /* FIXME why is the body size one byte smaller than the actual | |
889 | * size of the body? | |
890 | * this seems to be an error here as well as in | |
891 | * write_tag_11_packet() */ | |
892 | if (unlikely((*packet_size) + body_size + 1 > max_packet_size)) { | |
893 | ecryptfs_printk(KERN_ERR, "Packet size exceeds max\n"); | |
894 | rc = -EINVAL; | |
895 | goto out; | |
896 | } | |
897 | ||
898 | /* special flag one - one byte */ | |
899 | if (data[(*packet_size)++] != 0x62) { | |
900 | ecryptfs_printk(KERN_WARNING, "Unrecognizable packet\n"); | |
901 | rc = -EINVAL; | |
902 | goto out; | |
903 | } | |
904 | ||
905 | /* special flag two - one byte */ | |
906 | if (data[(*packet_size)++] != 0x08) { | |
907 | ecryptfs_printk(KERN_WARNING, "Unrecognizable packet\n"); | |
908 | rc = -EINVAL; | |
909 | goto out; | |
910 | } | |
911 | ||
912 | /* skip the next 12 bytes */ | |
913 | (*packet_size) += 12; /* We don't care about the filename or | |
914 | * the timestamp */ | |
915 | ||
916 | /* get the Tag 11 contents - tag_11_contents_size bytes */ | |
917 | memcpy(contents, &data[(*packet_size)], (*tag_11_contents_size)); | |
918 | (*packet_size) += (*tag_11_contents_size); | |
919 | ||
920 | out: | |
921 | if (rc) { | |
922 | (*packet_size) = 0; | |
923 | (*tag_11_contents_size) = 0; | |
924 | } | |
925 | return rc; | |
926 | } | |
927 | ||
f4aad16a MH |
928 | static int |
929 | ecryptfs_find_global_auth_tok_for_sig( | |
930 | struct ecryptfs_global_auth_tok **global_auth_tok, | |
931 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig) | |
932 | { | |
933 | struct ecryptfs_global_auth_tok *walker; | |
934 | int rc = 0; | |
935 | ||
936 | (*global_auth_tok) = NULL; | |
937 | mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex); | |
938 | list_for_each_entry(walker, | |
939 | &mount_crypt_stat->global_auth_tok_list, | |
940 | mount_crypt_stat_list) { | |
941 | if (memcmp(walker->sig, sig, ECRYPTFS_SIG_SIZE_HEX) == 0) { | |
942 | (*global_auth_tok) = walker; | |
943 | goto out; | |
944 | } | |
945 | } | |
946 | rc = -EINVAL; | |
947 | out: | |
948 | mutex_unlock(&mount_crypt_stat->global_auth_tok_list_mutex); | |
949 | return rc; | |
950 | } | |
951 | ||
237fead6 | 952 | /** |
f4aad16a MH |
953 | * ecryptfs_verify_version |
954 | * @version: The version number to confirm | |
955 | * | |
956 | * Returns zero on good version; non-zero otherwise | |
957 | */ | |
958 | static int ecryptfs_verify_version(u16 version) | |
959 | { | |
960 | int rc = 0; | |
961 | unsigned char major; | |
962 | unsigned char minor; | |
963 | ||
964 | major = ((version >> 8) & 0xFF); | |
965 | minor = (version & 0xFF); | |
966 | if (major != ECRYPTFS_VERSION_MAJOR) { | |
967 | ecryptfs_printk(KERN_ERR, "Major version number mismatch. " | |
968 | "Expected [%d]; got [%d]\n", | |
969 | ECRYPTFS_VERSION_MAJOR, major); | |
970 | rc = -EINVAL; | |
971 | goto out; | |
972 | } | |
973 | if (minor != ECRYPTFS_VERSION_MINOR) { | |
974 | ecryptfs_printk(KERN_ERR, "Minor version number mismatch. " | |
975 | "Expected [%d]; got [%d]\n", | |
976 | ECRYPTFS_VERSION_MINOR, minor); | |
977 | rc = -EINVAL; | |
978 | goto out; | |
979 | } | |
980 | out: | |
981 | return rc; | |
982 | } | |
983 | ||
984 | int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key, | |
985 | struct ecryptfs_auth_tok **auth_tok, | |
986 | char *sig) | |
987 | { | |
988 | int rc = 0; | |
989 | ||
990 | (*auth_tok_key) = request_key(&key_type_user, sig, NULL); | |
991 | if (!(*auth_tok_key) || IS_ERR(*auth_tok_key)) { | |
992 | printk(KERN_ERR "Could not find key with description: [%s]\n", | |
993 | sig); | |
994 | process_request_key_err(PTR_ERR(*auth_tok_key)); | |
995 | rc = -EINVAL; | |
996 | goto out; | |
997 | } | |
998 | (*auth_tok) = ecryptfs_get_key_payload_data(*auth_tok_key); | |
999 | if (ecryptfs_verify_version((*auth_tok)->version)) { | |
1000 | printk(KERN_ERR | |
1001 | "Data structure version mismatch. " | |
1002 | "Userspace tools must match eCryptfs " | |
1003 | "kernel module with major version [%d] " | |
1004 | "and minor version [%d]\n", | |
1005 | ECRYPTFS_VERSION_MAJOR, | |
1006 | ECRYPTFS_VERSION_MINOR); | |
1007 | rc = -EINVAL; | |
1008 | goto out; | |
1009 | } | |
1010 | if ((*auth_tok)->token_type != ECRYPTFS_PASSWORD | |
1011 | && (*auth_tok)->token_type != ECRYPTFS_PRIVATE_KEY) { | |
1012 | printk(KERN_ERR "Invalid auth_tok structure " | |
1013 | "returned from key query\n"); | |
1014 | rc = -EINVAL; | |
1015 | goto out; | |
1016 | } | |
1017 | out: | |
1018 | return rc; | |
1019 | } | |
1020 | ||
1021 | /** | |
1022 | * ecryptfs_find_auth_tok_for_sig | |
1023 | * @auth_tok: Set to the matching auth_tok; NULL if not found | |
1024 | * @crypt_stat: inode crypt_stat crypto context | |
1025 | * @sig: Sig of auth_tok to find | |
1026 | * | |
1027 | * For now, this function simply looks at the registered auth_tok's | |
1028 | * linked off the mount_crypt_stat, so all the auth_toks that can be | |
1029 | * used must be registered at mount time. This function could | |
1030 | * potentially try a lot harder to find auth_tok's (e.g., by calling | |
1031 | * out to ecryptfsd to dynamically retrieve an auth_tok object) so | |
1032 | * that static registration of auth_tok's will no longer be necessary. | |
1033 | * | |
1034 | * Returns zero on no error; non-zero on error | |
1035 | */ | |
1036 | static int | |
1037 | ecryptfs_find_auth_tok_for_sig( | |
1038 | struct ecryptfs_auth_tok **auth_tok, | |
1039 | struct ecryptfs_crypt_stat *crypt_stat, char *sig) | |
1040 | { | |
1041 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = | |
1042 | crypt_stat->mount_crypt_stat; | |
1043 | struct ecryptfs_global_auth_tok *global_auth_tok; | |
1044 | int rc = 0; | |
1045 | ||
1046 | (*auth_tok) = NULL; | |
1047 | if (ecryptfs_find_global_auth_tok_for_sig(&global_auth_tok, | |
1048 | mount_crypt_stat, sig)) { | |
1049 | struct key *auth_tok_key; | |
1050 | ||
1051 | rc = ecryptfs_keyring_auth_tok_for_sig(&auth_tok_key, auth_tok, | |
1052 | sig); | |
1053 | } else | |
1054 | (*auth_tok) = global_auth_tok->global_auth_tok; | |
1055 | return rc; | |
1056 | } | |
1057 | ||
1058 | /** | |
1059 | * decrypt_passphrase_encrypted_session_key - Decrypt the session key | |
1060 | * with the given auth_tok. | |
237fead6 MH |
1061 | * |
1062 | * Returns Zero on success; non-zero error otherwise. | |
1063 | */ | |
f4aad16a MH |
1064 | static int |
1065 | decrypt_passphrase_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok, | |
1066 | struct ecryptfs_crypt_stat *crypt_stat) | |
237fead6 | 1067 | { |
f4aad16a MH |
1068 | struct scatterlist dst_sg; |
1069 | struct scatterlist src_sg; | |
237fead6 | 1070 | struct mutex *tfm_mutex = NULL; |
8bba066f MH |
1071 | struct blkcipher_desc desc = { |
1072 | .flags = CRYPTO_TFM_REQ_MAY_SLEEP | |
1073 | }; | |
1074 | int rc = 0; | |
237fead6 | 1075 | |
f4aad16a MH |
1076 | if (unlikely(ecryptfs_verbosity > 0)) { |
1077 | ecryptfs_printk( | |
1078 | KERN_DEBUG, "Session key encryption key (size [%d]):\n", | |
1079 | auth_tok->token.password.session_key_encryption_key_bytes); | |
1080 | ecryptfs_dump_hex( | |
1081 | auth_tok->token.password.session_key_encryption_key, | |
1082 | auth_tok->token.password.session_key_encryption_key_bytes); | |
1083 | } | |
1084 | rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&desc.tfm, &tfm_mutex, | |
1085 | crypt_stat->cipher); | |
1086 | if (unlikely(rc)) { | |
1087 | printk(KERN_ERR "Internal error whilst attempting to get " | |
1088 | "tfm and mutex for cipher name [%s]; rc = [%d]\n", | |
1089 | crypt_stat->cipher, rc); | |
1090 | goto out; | |
237fead6 | 1091 | } |
f4aad16a MH |
1092 | if ((rc = virt_to_scatterlist(auth_tok->session_key.encrypted_key, |
1093 | auth_tok->session_key.encrypted_key_size, | |
1094 | &src_sg, 1)) != 1) { | |
1095 | printk(KERN_ERR "Internal error whilst attempting to convert " | |
1096 | "auth_tok->session_key.encrypted_key to scatterlist; " | |
1097 | "expected rc = 1; got rc = [%d]. " | |
1098 | "auth_tok->session_key.encrypted_key_size = [%d]\n", rc, | |
1099 | auth_tok->session_key.encrypted_key_size); | |
1100 | goto out; | |
1101 | } | |
1102 | auth_tok->session_key.decrypted_key_size = | |
1103 | auth_tok->session_key.encrypted_key_size; | |
1104 | if ((rc = virt_to_scatterlist(auth_tok->session_key.decrypted_key, | |
1105 | auth_tok->session_key.decrypted_key_size, | |
1106 | &dst_sg, 1)) != 1) { | |
1107 | printk(KERN_ERR "Internal error whilst attempting to convert " | |
1108 | "auth_tok->session_key.decrypted_key to scatterlist; " | |
1109 | "expected rc = 1; got rc = [%d]\n", rc); | |
1110 | goto out; | |
1111 | } | |
1112 | mutex_lock(tfm_mutex); | |
1113 | rc = crypto_blkcipher_setkey( | |
1114 | desc.tfm, auth_tok->token.password.session_key_encryption_key, | |
1115 | crypt_stat->key_size); | |
1116 | if (unlikely(rc < 0)) { | |
1117 | mutex_unlock(tfm_mutex); | |
e5d9cbde MH |
1118 | printk(KERN_ERR "Error setting key for crypto context\n"); |
1119 | rc = -EINVAL; | |
f4aad16a | 1120 | goto out; |
237fead6 | 1121 | } |
f4aad16a | 1122 | rc = crypto_blkcipher_decrypt(&desc, &dst_sg, &src_sg, |
8bba066f | 1123 | auth_tok->session_key.encrypted_key_size); |
f4aad16a MH |
1124 | mutex_unlock(tfm_mutex); |
1125 | if (unlikely(rc)) { | |
8bba066f | 1126 | printk(KERN_ERR "Error decrypting; rc = [%d]\n", rc); |
f4aad16a | 1127 | goto out; |
8bba066f | 1128 | } |
237fead6 MH |
1129 | auth_tok->session_key.flags |= ECRYPTFS_CONTAINS_DECRYPTED_KEY; |
1130 | memcpy(crypt_stat->key, auth_tok->session_key.decrypted_key, | |
1131 | auth_tok->session_key.decrypted_key_size); | |
e2bd99ec | 1132 | crypt_stat->flags |= ECRYPTFS_KEY_VALID; |
f4aad16a MH |
1133 | if (unlikely(ecryptfs_verbosity > 0)) { |
1134 | ecryptfs_printk(KERN_DEBUG, "FEK of size [%d]:\n", | |
1135 | crypt_stat->key_size); | |
237fead6 MH |
1136 | ecryptfs_dump_hex(crypt_stat->key, |
1137 | crypt_stat->key_size); | |
f4aad16a | 1138 | } |
237fead6 MH |
1139 | out: |
1140 | return rc; | |
1141 | } | |
1142 | ||
f4aad16a MH |
1143 | int ecryptfs_get_auth_tok_sig(char **sig, struct ecryptfs_auth_tok *auth_tok) |
1144 | { | |
1145 | int rc = 0; | |
1146 | ||
1147 | (*sig) = NULL; | |
1148 | switch (auth_tok->token_type) { | |
1149 | case ECRYPTFS_PASSWORD: | |
1150 | (*sig) = auth_tok->token.password.signature; | |
1151 | break; | |
1152 | case ECRYPTFS_PRIVATE_KEY: | |
1153 | (*sig) = auth_tok->token.private_key.signature; | |
1154 | break; | |
1155 | default: | |
1156 | printk(KERN_ERR "Cannot get sig for auth_tok of type [%d]\n", | |
1157 | auth_tok->token_type); | |
1158 | rc = -EINVAL; | |
1159 | } | |
1160 | return rc; | |
1161 | } | |
1162 | ||
237fead6 MH |
1163 | /** |
1164 | * ecryptfs_parse_packet_set | |
1165 | * @dest: The header page in memory | |
1166 | * @version: Version of file format, to guide parsing behavior | |
1167 | * | |
1168 | * Get crypt_stat to have the file's session key if the requisite key | |
1169 | * is available to decrypt the session key. | |
1170 | * | |
1171 | * Returns Zero if a valid authentication token was retrieved and | |
1172 | * processed; negative value for file not encrypted or for error | |
1173 | * conditions. | |
1174 | */ | |
1175 | int ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat, | |
1176 | unsigned char *src, | |
1177 | struct dentry *ecryptfs_dentry) | |
1178 | { | |
1179 | size_t i = 0; | |
f4aad16a | 1180 | size_t found_auth_tok; |
237fead6 | 1181 | size_t next_packet_is_auth_tok_packet; |
237fead6 | 1182 | struct list_head auth_tok_list; |
f4aad16a | 1183 | struct ecryptfs_auth_tok *matching_auth_tok = NULL; |
237fead6 | 1184 | struct ecryptfs_auth_tok *candidate_auth_tok = NULL; |
f4aad16a | 1185 | char *candidate_auth_tok_sig; |
237fead6 MH |
1186 | size_t packet_size; |
1187 | struct ecryptfs_auth_tok *new_auth_tok; | |
1188 | unsigned char sig_tmp_space[ECRYPTFS_SIG_SIZE]; | |
f4aad16a | 1189 | struct ecryptfs_auth_tok_list_item *auth_tok_list_item; |
237fead6 MH |
1190 | size_t tag_11_contents_size; |
1191 | size_t tag_11_packet_size; | |
dddfa461 | 1192 | int rc = 0; |
237fead6 MH |
1193 | |
1194 | INIT_LIST_HEAD(&auth_tok_list); | |
f4aad16a | 1195 | /* Parse the header to find as many packets as we can; these will be |
237fead6 MH |
1196 | * added the our &auth_tok_list */ |
1197 | next_packet_is_auth_tok_packet = 1; | |
1198 | while (next_packet_is_auth_tok_packet) { | |
1199 | size_t max_packet_size = ((PAGE_CACHE_SIZE - 8) - i); | |
1200 | ||
1201 | switch (src[i]) { | |
1202 | case ECRYPTFS_TAG_3_PACKET_TYPE: | |
1203 | rc = parse_tag_3_packet(crypt_stat, | |
1204 | (unsigned char *)&src[i], | |
1205 | &auth_tok_list, &new_auth_tok, | |
1206 | &packet_size, max_packet_size); | |
1207 | if (rc) { | |
1208 | ecryptfs_printk(KERN_ERR, "Error parsing " | |
1209 | "tag 3 packet\n"); | |
1210 | rc = -EIO; | |
1211 | goto out_wipe_list; | |
1212 | } | |
1213 | i += packet_size; | |
1214 | rc = parse_tag_11_packet((unsigned char *)&src[i], | |
1215 | sig_tmp_space, | |
1216 | ECRYPTFS_SIG_SIZE, | |
1217 | &tag_11_contents_size, | |
1218 | &tag_11_packet_size, | |
1219 | max_packet_size); | |
1220 | if (rc) { | |
1221 | ecryptfs_printk(KERN_ERR, "No valid " | |
1222 | "(ecryptfs-specific) literal " | |
1223 | "packet containing " | |
1224 | "authentication token " | |
1225 | "signature found after " | |
1226 | "tag 3 packet\n"); | |
1227 | rc = -EIO; | |
1228 | goto out_wipe_list; | |
1229 | } | |
1230 | i += tag_11_packet_size; | |
1231 | if (ECRYPTFS_SIG_SIZE != tag_11_contents_size) { | |
1232 | ecryptfs_printk(KERN_ERR, "Expected " | |
1233 | "signature of size [%d]; " | |
1234 | "read size [%d]\n", | |
1235 | ECRYPTFS_SIG_SIZE, | |
1236 | tag_11_contents_size); | |
1237 | rc = -EIO; | |
1238 | goto out_wipe_list; | |
1239 | } | |
1240 | ecryptfs_to_hex(new_auth_tok->token.password.signature, | |
1241 | sig_tmp_space, tag_11_contents_size); | |
1242 | new_auth_tok->token.password.signature[ | |
1243 | ECRYPTFS_PASSWORD_SIG_SIZE] = '\0'; | |
e2bd99ec | 1244 | crypt_stat->flags |= ECRYPTFS_ENCRYPTED; |
237fead6 | 1245 | break; |
dddfa461 MH |
1246 | case ECRYPTFS_TAG_1_PACKET_TYPE: |
1247 | rc = parse_tag_1_packet(crypt_stat, | |
1248 | (unsigned char *)&src[i], | |
1249 | &auth_tok_list, &new_auth_tok, | |
1250 | &packet_size, max_packet_size); | |
1251 | if (rc) { | |
1252 | ecryptfs_printk(KERN_ERR, "Error parsing " | |
1253 | "tag 1 packet\n"); | |
1254 | rc = -EIO; | |
1255 | goto out_wipe_list; | |
1256 | } | |
1257 | i += packet_size; | |
e2bd99ec | 1258 | crypt_stat->flags |= ECRYPTFS_ENCRYPTED; |
dddfa461 | 1259 | break; |
237fead6 MH |
1260 | case ECRYPTFS_TAG_11_PACKET_TYPE: |
1261 | ecryptfs_printk(KERN_WARNING, "Invalid packet set " | |
1262 | "(Tag 11 not allowed by itself)\n"); | |
1263 | rc = -EIO; | |
1264 | goto out_wipe_list; | |
1265 | break; | |
1266 | default: | |
1267 | ecryptfs_printk(KERN_DEBUG, "No packet at offset " | |
1268 | "[%d] of the file header; hex value of " | |
1269 | "character is [0x%.2x]\n", i, src[i]); | |
1270 | next_packet_is_auth_tok_packet = 0; | |
1271 | } | |
1272 | } | |
1273 | if (list_empty(&auth_tok_list)) { | |
f4aad16a MH |
1274 | printk(KERN_ERR "The lower file appears to be a non-encrypted " |
1275 | "eCryptfs file; this is not supported in this version " | |
1276 | "of the eCryptfs kernel module\n"); | |
1277 | rc = -EINVAL; | |
237fead6 MH |
1278 | goto out; |
1279 | } | |
f4aad16a MH |
1280 | /* auth_tok_list contains the set of authentication tokens |
1281 | * parsed from the metadata. We need to find a matching | |
1282 | * authentication token that has the secret component(s) | |
1283 | * necessary to decrypt the EFEK in the auth_tok parsed from | |
1284 | * the metadata. There may be several potential matches, but | |
1285 | * just one will be sufficient to decrypt to get the FEK. */ | |
1286 | find_next_matching_auth_tok: | |
1287 | found_auth_tok = 0; | |
1288 | list_for_each_entry(auth_tok_list_item, &auth_tok_list, list) { | |
237fead6 MH |
1289 | candidate_auth_tok = &auth_tok_list_item->auth_tok; |
1290 | if (unlikely(ecryptfs_verbosity > 0)) { | |
1291 | ecryptfs_printk(KERN_DEBUG, | |
1292 | "Considering cadidate auth tok:\n"); | |
1293 | ecryptfs_dump_auth_tok(candidate_auth_tok); | |
1294 | } | |
f4aad16a MH |
1295 | if ((rc = ecryptfs_get_auth_tok_sig(&candidate_auth_tok_sig, |
1296 | candidate_auth_tok))) { | |
1297 | printk(KERN_ERR | |
1298 | "Unrecognized candidate auth tok type: [%d]\n", | |
1299 | candidate_auth_tok->token_type); | |
1300 | rc = -EINVAL; | |
1301 | goto out_wipe_list; | |
1302 | } | |
1303 | if ((rc = ecryptfs_find_auth_tok_for_sig( | |
1304 | &matching_auth_tok, crypt_stat, | |
1305 | candidate_auth_tok_sig))) | |
1306 | rc = 0; | |
1307 | if (matching_auth_tok) { | |
dddfa461 | 1308 | found_auth_tok = 1; |
f4aad16a | 1309 | goto found_matching_auth_tok; |
237fead6 MH |
1310 | } |
1311 | } | |
237fead6 | 1312 | if (!found_auth_tok) { |
f4aad16a MH |
1313 | ecryptfs_printk(KERN_ERR, "Could not find a usable " |
1314 | "authentication token\n"); | |
237fead6 MH |
1315 | rc = -EIO; |
1316 | goto out_wipe_list; | |
dddfa461 | 1317 | } |
f4aad16a | 1318 | found_matching_auth_tok: |
e2bd99ec | 1319 | if (candidate_auth_tok->token_type == ECRYPTFS_PRIVATE_KEY) { |
dddfa461 | 1320 | memcpy(&(candidate_auth_tok->token.private_key), |
f4aad16a | 1321 | &(matching_auth_tok->token.private_key), |
dddfa461 | 1322 | sizeof(struct ecryptfs_private_key)); |
f4aad16a | 1323 | rc = decrypt_pki_encrypted_session_key(candidate_auth_tok, |
dddfa461 MH |
1324 | crypt_stat); |
1325 | } else if (candidate_auth_tok->token_type == ECRYPTFS_PASSWORD) { | |
237fead6 | 1326 | memcpy(&(candidate_auth_tok->token.password), |
f4aad16a | 1327 | &(matching_auth_tok->token.password), |
237fead6 | 1328 | sizeof(struct ecryptfs_password)); |
f4aad16a MH |
1329 | rc = decrypt_passphrase_encrypted_session_key( |
1330 | candidate_auth_tok, crypt_stat); | |
dddfa461 MH |
1331 | } |
1332 | if (rc) { | |
f4aad16a MH |
1333 | struct ecryptfs_auth_tok_list_item *auth_tok_list_item_tmp; |
1334 | ||
1335 | ecryptfs_printk(KERN_WARNING, "Error decrypting the " | |
1336 | "session key for authentication token with sig " | |
1337 | "[%.*s]; rc = [%d]. Removing auth tok " | |
1338 | "candidate from the list and searching for " | |
1339 | "the next match.\n", candidate_auth_tok_sig, | |
1340 | ECRYPTFS_SIG_SIZE_HEX, rc); | |
1341 | list_for_each_entry_safe(auth_tok_list_item, | |
1342 | auth_tok_list_item_tmp, | |
1343 | &auth_tok_list, list) { | |
1344 | if (candidate_auth_tok | |
1345 | == &auth_tok_list_item->auth_tok) { | |
1346 | list_del(&auth_tok_list_item->list); | |
1347 | kmem_cache_free( | |
1348 | ecryptfs_auth_tok_list_item_cache, | |
1349 | auth_tok_list_item); | |
1350 | goto find_next_matching_auth_tok; | |
1351 | } | |
1352 | } | |
1353 | BUG(); | |
dddfa461 MH |
1354 | } |
1355 | rc = ecryptfs_compute_root_iv(crypt_stat); | |
1356 | if (rc) { | |
1357 | ecryptfs_printk(KERN_ERR, "Error computing " | |
1358 | "the root IV\n"); | |
1359 | goto out_wipe_list; | |
237fead6 MH |
1360 | } |
1361 | rc = ecryptfs_init_crypt_ctx(crypt_stat); | |
1362 | if (rc) { | |
1363 | ecryptfs_printk(KERN_ERR, "Error initializing crypto " | |
1364 | "context for cipher [%s]; rc = [%d]\n", | |
1365 | crypt_stat->cipher, rc); | |
1366 | } | |
1367 | out_wipe_list: | |
1368 | wipe_auth_tok_list(&auth_tok_list); | |
1369 | out: | |
1370 | return rc; | |
1371 | } | |
f4aad16a | 1372 | |
dddfa461 MH |
1373 | static int |
1374 | pki_encrypt_session_key(struct ecryptfs_auth_tok *auth_tok, | |
1375 | struct ecryptfs_crypt_stat *crypt_stat, | |
1376 | struct ecryptfs_key_record *key_rec) | |
1377 | { | |
1378 | struct ecryptfs_msg_ctx *msg_ctx = NULL; | |
1379 | char *netlink_payload; | |
1380 | size_t netlink_payload_length; | |
1381 | struct ecryptfs_message *msg; | |
1382 | int rc; | |
1383 | ||
1384 | rc = write_tag_66_packet(auth_tok->token.private_key.signature, | |
1385 | ecryptfs_code_for_cipher_string(crypt_stat), | |
1386 | crypt_stat, &netlink_payload, | |
1387 | &netlink_payload_length); | |
1388 | if (rc) { | |
1389 | ecryptfs_printk(KERN_ERR, "Error generating tag 66 packet\n"); | |
1390 | goto out; | |
1391 | } | |
1392 | rc = ecryptfs_send_message(ecryptfs_transport, netlink_payload, | |
1393 | netlink_payload_length, &msg_ctx); | |
1394 | if (rc) { | |
1395 | ecryptfs_printk(KERN_ERR, "Error sending netlink message\n"); | |
1396 | goto out; | |
1397 | } | |
1398 | rc = ecryptfs_wait_for_response(msg_ctx, &msg); | |
1399 | if (rc) { | |
1400 | ecryptfs_printk(KERN_ERR, "Failed to receive tag 67 packet " | |
1401 | "from the user space daemon\n"); | |
1402 | rc = -EIO; | |
1403 | goto out; | |
1404 | } | |
1405 | rc = parse_tag_67_packet(key_rec, msg); | |
1406 | if (rc) | |
1407 | ecryptfs_printk(KERN_ERR, "Error parsing tag 67 packet\n"); | |
1408 | kfree(msg); | |
1409 | out: | |
1410 | if (netlink_payload) | |
1411 | kfree(netlink_payload); | |
1412 | return rc; | |
1413 | } | |
1414 | /** | |
1415 | * write_tag_1_packet - Write an RFC2440-compatible tag 1 (public key) packet | |
1416 | * @dest: Buffer into which to write the packet | |
1417 | * @max: Maximum number of bytes that can be writtn | |
1418 | * @packet_size: This function will write the number of bytes that end | |
1419 | * up constituting the packet; set to zero on error | |
1420 | * | |
1421 | * Returns zero on success; non-zero on error. | |
1422 | */ | |
1423 | static int | |
f4aad16a MH |
1424 | write_tag_1_packet(char *dest, size_t *remaining_bytes, |
1425 | struct ecryptfs_auth_tok *auth_tok, | |
dddfa461 | 1426 | struct ecryptfs_crypt_stat *crypt_stat, |
dddfa461 MH |
1427 | struct ecryptfs_key_record *key_rec, size_t *packet_size) |
1428 | { | |
1429 | size_t i; | |
1430 | size_t encrypted_session_key_valid = 0; | |
dddfa461 | 1431 | size_t packet_size_length; |
f4aad16a | 1432 | size_t max_packet_size; |
dddfa461 MH |
1433 | int rc = 0; |
1434 | ||
1435 | (*packet_size) = 0; | |
1436 | ecryptfs_from_hex(key_rec->sig, auth_tok->token.private_key.signature, | |
1437 | ECRYPTFS_SIG_SIZE); | |
1438 | encrypted_session_key_valid = 0; | |
1439 | for (i = 0; i < crypt_stat->key_size; i++) | |
1440 | encrypted_session_key_valid |= | |
1441 | auth_tok->session_key.encrypted_key[i]; | |
1442 | if (encrypted_session_key_valid) { | |
1443 | memcpy(key_rec->enc_key, | |
1444 | auth_tok->session_key.encrypted_key, | |
1445 | auth_tok->session_key.encrypted_key_size); | |
1446 | goto encrypted_session_key_set; | |
1447 | } | |
1448 | if (auth_tok->session_key.encrypted_key_size == 0) | |
1449 | auth_tok->session_key.encrypted_key_size = | |
1450 | auth_tok->token.private_key.key_size; | |
1451 | rc = pki_encrypt_session_key(auth_tok, crypt_stat, key_rec); | |
1452 | if (rc) { | |
1453 | ecryptfs_printk(KERN_ERR, "Failed to encrypt session key " | |
1454 | "via a pki"); | |
1455 | goto out; | |
1456 | } | |
1457 | if (ecryptfs_verbosity > 0) { | |
1458 | ecryptfs_printk(KERN_DEBUG, "Encrypted key:\n"); | |
1459 | ecryptfs_dump_hex(key_rec->enc_key, key_rec->enc_key_size); | |
1460 | } | |
1461 | encrypted_session_key_set: | |
f4aad16a MH |
1462 | /* This format is inspired by OpenPGP; see RFC 2440 |
1463 | * packet tag 1 */ | |
1464 | max_packet_size = (1 /* Tag 1 identifier */ | |
1465 | + 3 /* Max Tag 1 packet size */ | |
1466 | + 1 /* Version */ | |
1467 | + ECRYPTFS_SIG_SIZE /* Key identifier */ | |
1468 | + 1 /* Cipher identifier */ | |
1469 | + key_rec->enc_key_size); /* Encrypted key size */ | |
1470 | if (max_packet_size > (*remaining_bytes)) { | |
1471 | printk(KERN_ERR "Packet length larger than maximum allowable; " | |
1472 | "need up to [%d] bytes, but there are only [%d] " | |
1473 | "available\n", max_packet_size, (*remaining_bytes)); | |
dddfa461 MH |
1474 | rc = -EINVAL; |
1475 | goto out; | |
1476 | } | |
1477 | dest[(*packet_size)++] = ECRYPTFS_TAG_1_PACKET_TYPE; | |
f4aad16a | 1478 | rc = write_packet_length(&dest[(*packet_size)], (max_packet_size - 4), |
dddfa461 MH |
1479 | &packet_size_length); |
1480 | if (rc) { | |
1481 | ecryptfs_printk(KERN_ERR, "Error generating tag 1 packet " | |
1482 | "header; cannot generate packet length\n"); | |
1483 | goto out; | |
1484 | } | |
1485 | (*packet_size) += packet_size_length; | |
1486 | dest[(*packet_size)++] = 0x03; /* version 3 */ | |
1487 | memcpy(&dest[(*packet_size)], key_rec->sig, ECRYPTFS_SIG_SIZE); | |
1488 | (*packet_size) += ECRYPTFS_SIG_SIZE; | |
1489 | dest[(*packet_size)++] = RFC2440_CIPHER_RSA; | |
1490 | memcpy(&dest[(*packet_size)], key_rec->enc_key, | |
1491 | key_rec->enc_key_size); | |
1492 | (*packet_size) += key_rec->enc_key_size; | |
1493 | out: | |
1494 | if (rc) | |
1495 | (*packet_size) = 0; | |
f4aad16a MH |
1496 | else |
1497 | (*remaining_bytes) -= (*packet_size); | |
dddfa461 MH |
1498 | return rc; |
1499 | } | |
237fead6 MH |
1500 | |
1501 | /** | |
1502 | * write_tag_11_packet | |
1503 | * @dest: Target into which Tag 11 packet is to be written | |
1504 | * @max: Maximum packet length | |
1505 | * @contents: Byte array of contents to copy in | |
1506 | * @contents_length: Number of bytes in contents | |
1507 | * @packet_length: Length of the Tag 11 packet written; zero on error | |
1508 | * | |
1509 | * Returns zero on success; non-zero on error. | |
1510 | */ | |
1511 | static int | |
1512 | write_tag_11_packet(char *dest, int max, char *contents, size_t contents_length, | |
1513 | size_t *packet_length) | |
1514 | { | |
237fead6 | 1515 | size_t packet_size_length; |
dddfa461 | 1516 | int rc = 0; |
237fead6 MH |
1517 | |
1518 | (*packet_length) = 0; | |
1519 | if ((13 + contents_length) > max) { | |
1520 | rc = -EINVAL; | |
1521 | ecryptfs_printk(KERN_ERR, "Packet length larger than " | |
1522 | "maximum allowable\n"); | |
1523 | goto out; | |
1524 | } | |
1525 | /* General packet header */ | |
1526 | /* Packet tag */ | |
1527 | dest[(*packet_length)++] = ECRYPTFS_TAG_11_PACKET_TYPE; | |
1528 | /* Packet length */ | |
1529 | rc = write_packet_length(&dest[(*packet_length)], | |
1530 | (13 + contents_length), &packet_size_length); | |
1531 | if (rc) { | |
1532 | ecryptfs_printk(KERN_ERR, "Error generating tag 11 packet " | |
1533 | "header; cannot generate packet length\n"); | |
1534 | goto out; | |
1535 | } | |
1536 | (*packet_length) += packet_size_length; | |
1537 | /* Tag 11 specific */ | |
1538 | /* One-octet field that describes how the data is formatted */ | |
1539 | dest[(*packet_length)++] = 0x62; /* binary data */ | |
1540 | /* One-octet filename length followed by filename */ | |
1541 | dest[(*packet_length)++] = 8; | |
1542 | memcpy(&dest[(*packet_length)], "_CONSOLE", 8); | |
1543 | (*packet_length) += 8; | |
1544 | /* Four-octet number indicating modification date */ | |
1545 | memset(&dest[(*packet_length)], 0x00, 4); | |
1546 | (*packet_length) += 4; | |
1547 | /* Remainder is literal data */ | |
1548 | memcpy(&dest[(*packet_length)], contents, contents_length); | |
1549 | (*packet_length) += contents_length; | |
1550 | out: | |
1551 | if (rc) | |
1552 | (*packet_length) = 0; | |
1553 | return rc; | |
1554 | } | |
1555 | ||
1556 | /** | |
1557 | * write_tag_3_packet | |
1558 | * @dest: Buffer into which to write the packet | |
1559 | * @max: Maximum number of bytes that can be written | |
1560 | * @auth_tok: Authentication token | |
1561 | * @crypt_stat: The cryptographic context | |
1562 | * @key_rec: encrypted key | |
1563 | * @packet_size: This function will write the number of bytes that end | |
1564 | * up constituting the packet; set to zero on error | |
1565 | * | |
1566 | * Returns zero on success; non-zero on error. | |
1567 | */ | |
1568 | static int | |
f4aad16a MH |
1569 | write_tag_3_packet(char *dest, size_t *remaining_bytes, |
1570 | struct ecryptfs_auth_tok *auth_tok, | |
237fead6 MH |
1571 | struct ecryptfs_crypt_stat *crypt_stat, |
1572 | struct ecryptfs_key_record *key_rec, size_t *packet_size) | |
1573 | { | |
237fead6 | 1574 | size_t i; |
237fead6 MH |
1575 | size_t encrypted_session_key_valid = 0; |
1576 | char session_key_encryption_key[ECRYPTFS_MAX_KEY_BYTES]; | |
f4aad16a MH |
1577 | struct scatterlist dst_sg; |
1578 | struct scatterlist src_sg; | |
237fead6 | 1579 | struct mutex *tfm_mutex = NULL; |
237fead6 | 1580 | size_t cipher_code; |
f4aad16a MH |
1581 | size_t packet_size_length; |
1582 | size_t max_packet_size; | |
1583 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = | |
1584 | crypt_stat->mount_crypt_stat; | |
8bba066f MH |
1585 | struct blkcipher_desc desc = { |
1586 | .tfm = NULL, | |
1587 | .flags = CRYPTO_TFM_REQ_MAY_SLEEP | |
1588 | }; | |
1589 | int rc = 0; | |
237fead6 MH |
1590 | |
1591 | (*packet_size) = 0; | |
dddfa461 | 1592 | ecryptfs_from_hex(key_rec->sig, auth_tok->token.password.signature, |
237fead6 | 1593 | ECRYPTFS_SIG_SIZE); |
f4aad16a MH |
1594 | rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&desc.tfm, &tfm_mutex, |
1595 | crypt_stat->cipher); | |
1596 | if (unlikely(rc)) { | |
1597 | printk(KERN_ERR "Internal error whilst attempting to get " | |
1598 | "tfm and mutex for cipher name [%s]; rc = [%d]\n", | |
1599 | crypt_stat->cipher, rc); | |
1600 | goto out; | |
1601 | } | |
1602 | if (mount_crypt_stat->global_default_cipher_key_size == 0) { | |
1603 | struct blkcipher_alg *alg = crypto_blkcipher_alg(desc.tfm); | |
1604 | ||
1605 | printk(KERN_WARNING "No key size specified at mount; " | |
1606 | "defaulting to [%d]\n", alg->max_keysize); | |
1607 | mount_crypt_stat->global_default_cipher_key_size = | |
1608 | alg->max_keysize; | |
237fead6 | 1609 | } |
f4aad16a MH |
1610 | if (crypt_stat->key_size == 0) |
1611 | crypt_stat->key_size = | |
1612 | mount_crypt_stat->global_default_cipher_key_size; | |
237fead6 MH |
1613 | if (auth_tok->session_key.encrypted_key_size == 0) |
1614 | auth_tok->session_key.encrypted_key_size = | |
1615 | crypt_stat->key_size; | |
1616 | if (crypt_stat->key_size == 24 | |
1617 | && strcmp("aes", crypt_stat->cipher) == 0) { | |
1618 | memset((crypt_stat->key + 24), 0, 8); | |
1619 | auth_tok->session_key.encrypted_key_size = 32; | |
f4aad16a MH |
1620 | } else |
1621 | auth_tok->session_key.encrypted_key_size = crypt_stat->key_size; | |
dddfa461 | 1622 | key_rec->enc_key_size = |
237fead6 | 1623 | auth_tok->session_key.encrypted_key_size; |
f4aad16a MH |
1624 | encrypted_session_key_valid = 0; |
1625 | for (i = 0; i < auth_tok->session_key.encrypted_key_size; i++) | |
1626 | encrypted_session_key_valid |= | |
1627 | auth_tok->session_key.encrypted_key[i]; | |
1628 | if (encrypted_session_key_valid) { | |
1629 | ecryptfs_printk(KERN_DEBUG, "encrypted_session_key_valid != 0; " | |
1630 | "using auth_tok->session_key.encrypted_key, " | |
1631 | "where key_rec->enc_key_size = [%d]\n", | |
1632 | key_rec->enc_key_size); | |
1633 | memcpy(key_rec->enc_key, | |
1634 | auth_tok->session_key.encrypted_key, | |
1635 | key_rec->enc_key_size); | |
1636 | goto encrypted_session_key_set; | |
1637 | } | |
dddfa461 MH |
1638 | if (auth_tok->token.password.flags & |
1639 | ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET) { | |
237fead6 MH |
1640 | ecryptfs_printk(KERN_DEBUG, "Using previously generated " |
1641 | "session key encryption key of size [%d]\n", | |
1642 | auth_tok->token.password. | |
1643 | session_key_encryption_key_bytes); | |
1644 | memcpy(session_key_encryption_key, | |
1645 | auth_tok->token.password.session_key_encryption_key, | |
1646 | crypt_stat->key_size); | |
1647 | ecryptfs_printk(KERN_DEBUG, | |
1648 | "Cached session key " "encryption key: \n"); | |
1649 | if (ecryptfs_verbosity > 0) | |
1650 | ecryptfs_dump_hex(session_key_encryption_key, 16); | |
1651 | } | |
1652 | if (unlikely(ecryptfs_verbosity > 0)) { | |
1653 | ecryptfs_printk(KERN_DEBUG, "Session key encryption key:\n"); | |
1654 | ecryptfs_dump_hex(session_key_encryption_key, 16); | |
1655 | } | |
f4aad16a MH |
1656 | if ((rc = virt_to_scatterlist(crypt_stat->key, |
1657 | key_rec->enc_key_size, &src_sg, 1)) | |
1658 | != 1) { | |
237fead6 | 1659 | ecryptfs_printk(KERN_ERR, "Error generating scatterlist " |
f4aad16a MH |
1660 | "for crypt_stat session key; expected rc = 1; " |
1661 | "got rc = [%d]. key_rec->enc_key_size = [%d]\n", | |
1662 | rc, key_rec->enc_key_size); | |
237fead6 MH |
1663 | rc = -ENOMEM; |
1664 | goto out; | |
1665 | } | |
f4aad16a MH |
1666 | if ((rc = virt_to_scatterlist(key_rec->enc_key, |
1667 | key_rec->enc_key_size, &dst_sg, 1)) | |
1668 | != 1) { | |
237fead6 | 1669 | ecryptfs_printk(KERN_ERR, "Error generating scatterlist " |
f4aad16a MH |
1670 | "for crypt_stat encrypted session key; " |
1671 | "expected rc = 1; got rc = [%d]. " | |
1672 | "key_rec->enc_key_size = [%d]\n", rc, | |
1673 | key_rec->enc_key_size); | |
237fead6 MH |
1674 | rc = -ENOMEM; |
1675 | goto out; | |
1676 | } | |
f4aad16a | 1677 | mutex_lock(tfm_mutex); |
8bba066f MH |
1678 | rc = crypto_blkcipher_setkey(desc.tfm, session_key_encryption_key, |
1679 | crypt_stat->key_size); | |
237fead6 | 1680 | if (rc < 0) { |
f4aad16a | 1681 | mutex_unlock(tfm_mutex); |
237fead6 | 1682 | ecryptfs_printk(KERN_ERR, "Error setting key for crypto " |
8bba066f | 1683 | "context; rc = [%d]\n", rc); |
237fead6 MH |
1684 | goto out; |
1685 | } | |
1686 | rc = 0; | |
1687 | ecryptfs_printk(KERN_DEBUG, "Encrypting [%d] bytes of the key\n", | |
1688 | crypt_stat->key_size); | |
f4aad16a | 1689 | rc = crypto_blkcipher_encrypt(&desc, &dst_sg, &src_sg, |
8bba066f | 1690 | (*key_rec).enc_key_size); |
f4aad16a | 1691 | mutex_unlock(tfm_mutex); |
8bba066f MH |
1692 | if (rc) { |
1693 | printk(KERN_ERR "Error encrypting; rc = [%d]\n", rc); | |
1694 | goto out; | |
1695 | } | |
237fead6 | 1696 | ecryptfs_printk(KERN_DEBUG, "This should be the encrypted key:\n"); |
f4aad16a MH |
1697 | if (ecryptfs_verbosity > 0) { |
1698 | ecryptfs_printk(KERN_DEBUG, "EFEK of size [%d]:\n", | |
1699 | key_rec->enc_key_size); | |
dddfa461 MH |
1700 | ecryptfs_dump_hex(key_rec->enc_key, |
1701 | key_rec->enc_key_size); | |
237fead6 | 1702 | } |
f4aad16a MH |
1703 | encrypted_session_key_set: |
1704 | /* This format is inspired by OpenPGP; see RFC 2440 | |
1705 | * packet tag 3 */ | |
1706 | max_packet_size = (1 /* Tag 3 identifier */ | |
1707 | + 3 /* Max Tag 3 packet size */ | |
1708 | + 1 /* Version */ | |
1709 | + 1 /* Cipher code */ | |
1710 | + 1 /* S2K specifier */ | |
1711 | + 1 /* Hash identifier */ | |
1712 | + ECRYPTFS_SALT_SIZE /* Salt */ | |
1713 | + 1 /* Hash iterations */ | |
1714 | + key_rec->enc_key_size); /* Encrypted key size */ | |
1715 | if (max_packet_size > (*remaining_bytes)) { | |
1716 | printk(KERN_ERR "Packet too large; need up to [%d] bytes, but " | |
1717 | "there are only [%d] available\n", max_packet_size, | |
1718 | (*remaining_bytes)); | |
237fead6 MH |
1719 | rc = -EINVAL; |
1720 | goto out; | |
1721 | } | |
237fead6 | 1722 | dest[(*packet_size)++] = ECRYPTFS_TAG_3_PACKET_TYPE; |
f4aad16a MH |
1723 | /* Chop off the Tag 3 identifier(1) and Tag 3 packet size(3) |
1724 | * to get the number of octets in the actual Tag 3 packet */ | |
1725 | rc = write_packet_length(&dest[(*packet_size)], (max_packet_size - 4), | |
237fead6 MH |
1726 | &packet_size_length); |
1727 | if (rc) { | |
f4aad16a MH |
1728 | printk(KERN_ERR "Error generating tag 3 packet header; cannot " |
1729 | "generate packet length. rc = [%d]\n", rc); | |
237fead6 MH |
1730 | goto out; |
1731 | } | |
1732 | (*packet_size) += packet_size_length; | |
1733 | dest[(*packet_size)++] = 0x04; /* version 4 */ | |
f4aad16a MH |
1734 | /* TODO: Break from RFC2440 so that arbitrary ciphers can be |
1735 | * specified with strings */ | |
237fead6 MH |
1736 | cipher_code = ecryptfs_code_for_cipher_string(crypt_stat); |
1737 | if (cipher_code == 0) { | |
1738 | ecryptfs_printk(KERN_WARNING, "Unable to generate code for " | |
1739 | "cipher [%s]\n", crypt_stat->cipher); | |
1740 | rc = -EINVAL; | |
1741 | goto out; | |
1742 | } | |
1743 | dest[(*packet_size)++] = cipher_code; | |
1744 | dest[(*packet_size)++] = 0x03; /* S2K */ | |
1745 | dest[(*packet_size)++] = 0x01; /* MD5 (TODO: parameterize) */ | |
1746 | memcpy(&dest[(*packet_size)], auth_tok->token.password.salt, | |
1747 | ECRYPTFS_SALT_SIZE); | |
1748 | (*packet_size) += ECRYPTFS_SALT_SIZE; /* salt */ | |
1749 | dest[(*packet_size)++] = 0x60; /* hash iterations (65536) */ | |
dddfa461 MH |
1750 | memcpy(&dest[(*packet_size)], key_rec->enc_key, |
1751 | key_rec->enc_key_size); | |
1752 | (*packet_size) += key_rec->enc_key_size; | |
237fead6 | 1753 | out: |
237fead6 MH |
1754 | if (rc) |
1755 | (*packet_size) = 0; | |
f4aad16a MH |
1756 | else |
1757 | (*remaining_bytes) -= (*packet_size); | |
237fead6 MH |
1758 | return rc; |
1759 | } | |
1760 | ||
eb95e7ff MH |
1761 | struct kmem_cache *ecryptfs_key_record_cache; |
1762 | ||
237fead6 MH |
1763 | /** |
1764 | * ecryptfs_generate_key_packet_set | |
1765 | * @dest: Virtual address from which to write the key record set | |
1766 | * @crypt_stat: The cryptographic context from which the | |
1767 | * authentication tokens will be retrieved | |
1768 | * @ecryptfs_dentry: The dentry, used to retrieve the mount crypt stat | |
1769 | * for the global parameters | |
1770 | * @len: The amount written | |
1771 | * @max: The maximum amount of data allowed to be written | |
1772 | * | |
1773 | * Generates a key packet set and writes it to the virtual address | |
1774 | * passed in. | |
1775 | * | |
1776 | * Returns zero on success; non-zero on error. | |
1777 | */ | |
1778 | int | |
1779 | ecryptfs_generate_key_packet_set(char *dest_base, | |
1780 | struct ecryptfs_crypt_stat *crypt_stat, | |
1781 | struct dentry *ecryptfs_dentry, size_t *len, | |
1782 | size_t max) | |
1783 | { | |
237fead6 | 1784 | struct ecryptfs_auth_tok *auth_tok; |
f4aad16a | 1785 | struct ecryptfs_global_auth_tok *global_auth_tok; |
237fead6 MH |
1786 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = |
1787 | &ecryptfs_superblock_to_private( | |
1788 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
1789 | size_t written; | |
eb95e7ff | 1790 | struct ecryptfs_key_record *key_rec; |
f4aad16a | 1791 | struct ecryptfs_key_sig *key_sig; |
dddfa461 | 1792 | int rc = 0; |
237fead6 MH |
1793 | |
1794 | (*len) = 0; | |
f4aad16a | 1795 | mutex_lock(&crypt_stat->keysig_list_mutex); |
eb95e7ff MH |
1796 | key_rec = kmem_cache_alloc(ecryptfs_key_record_cache, GFP_KERNEL); |
1797 | if (!key_rec) { | |
1798 | rc = -ENOMEM; | |
1799 | goto out; | |
1800 | } | |
f4aad16a MH |
1801 | list_for_each_entry(key_sig, &crypt_stat->keysig_list, |
1802 | crypt_stat_list) { | |
1803 | memset(key_rec, 0, sizeof(*key_rec)); | |
1804 | rc = ecryptfs_find_global_auth_tok_for_sig(&global_auth_tok, | |
1805 | mount_crypt_stat, | |
1806 | key_sig->keysig); | |
1807 | if (rc) { | |
1808 | printk(KERN_ERR "Error attempting to get the global " | |
1809 | "auth_tok; rc = [%d]\n", rc); | |
1810 | goto out_free; | |
1811 | } | |
1812 | if (global_auth_tok->flags & ECRYPTFS_AUTH_TOK_INVALID) { | |
1813 | printk(KERN_WARNING | |
1814 | "Skipping invalid auth tok with sig = [%s]\n", | |
1815 | global_auth_tok->sig); | |
1816 | continue; | |
1817 | } | |
1818 | auth_tok = global_auth_tok->global_auth_tok; | |
237fead6 MH |
1819 | if (auth_tok->token_type == ECRYPTFS_PASSWORD) { |
1820 | rc = write_tag_3_packet((dest_base + (*len)), | |
f4aad16a | 1821 | &max, auth_tok, |
eb95e7ff | 1822 | crypt_stat, key_rec, |
237fead6 MH |
1823 | &written); |
1824 | if (rc) { | |
1825 | ecryptfs_printk(KERN_WARNING, "Error " | |
1826 | "writing tag 3 packet\n"); | |
eb95e7ff | 1827 | goto out_free; |
237fead6 MH |
1828 | } |
1829 | (*len) += written; | |
1830 | /* Write auth tok signature packet */ | |
f4aad16a MH |
1831 | rc = write_tag_11_packet((dest_base + (*len)), &max, |
1832 | key_rec->sig, | |
1833 | ECRYPTFS_SIG_SIZE, &written); | |
237fead6 MH |
1834 | if (rc) { |
1835 | ecryptfs_printk(KERN_ERR, "Error writing " | |
1836 | "auth tok signature packet\n"); | |
eb95e7ff | 1837 | goto out_free; |
237fead6 MH |
1838 | } |
1839 | (*len) += written; | |
dddfa461 MH |
1840 | } else if (auth_tok->token_type == ECRYPTFS_PRIVATE_KEY) { |
1841 | rc = write_tag_1_packet(dest_base + (*len), | |
f4aad16a MH |
1842 | &max, auth_tok, |
1843 | crypt_stat, key_rec, &written); | |
dddfa461 MH |
1844 | if (rc) { |
1845 | ecryptfs_printk(KERN_WARNING, "Error " | |
1846 | "writing tag 1 packet\n"); | |
eb95e7ff | 1847 | goto out_free; |
dddfa461 MH |
1848 | } |
1849 | (*len) += written; | |
237fead6 MH |
1850 | } else { |
1851 | ecryptfs_printk(KERN_WARNING, "Unsupported " | |
1852 | "authentication token type\n"); | |
1853 | rc = -EINVAL; | |
eb95e7ff | 1854 | goto out_free; |
237fead6 | 1855 | } |
f4aad16a MH |
1856 | } |
1857 | if (likely(max > 0)) { | |
237fead6 MH |
1858 | dest_base[(*len)] = 0x00; |
1859 | } else { | |
1860 | ecryptfs_printk(KERN_ERR, "Error writing boundary byte\n"); | |
1861 | rc = -EIO; | |
1862 | } | |
eb95e7ff MH |
1863 | out_free: |
1864 | kmem_cache_free(ecryptfs_key_record_cache, key_rec); | |
237fead6 MH |
1865 | out: |
1866 | if (rc) | |
1867 | (*len) = 0; | |
f4aad16a MH |
1868 | mutex_unlock(&crypt_stat->keysig_list_mutex); |
1869 | return rc; | |
1870 | } | |
1871 | ||
1872 | struct kmem_cache *ecryptfs_key_sig_cache; | |
1873 | ||
1874 | int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig) | |
1875 | { | |
1876 | struct ecryptfs_key_sig *new_key_sig; | |
1877 | int rc = 0; | |
1878 | ||
1879 | new_key_sig = kmem_cache_alloc(ecryptfs_key_sig_cache, GFP_KERNEL); | |
1880 | if (!new_key_sig) { | |
1881 | rc = -ENOMEM; | |
1882 | printk(KERN_ERR | |
1883 | "Error allocating from ecryptfs_key_sig_cache\n"); | |
1884 | goto out; | |
1885 | } | |
1886 | memcpy(new_key_sig->keysig, sig, ECRYPTFS_SIG_SIZE_HEX); | |
1887 | mutex_lock(&crypt_stat->keysig_list_mutex); | |
1888 | list_add(&new_key_sig->crypt_stat_list, &crypt_stat->keysig_list); | |
1889 | mutex_unlock(&crypt_stat->keysig_list_mutex); | |
1890 | out: | |
237fead6 MH |
1891 | return rc; |
1892 | } | |
f4aad16a MH |
1893 | |
1894 | struct kmem_cache *ecryptfs_global_auth_tok_cache; | |
1895 | ||
1896 | int | |
1897 | ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat, | |
1898 | char *sig) | |
1899 | { | |
1900 | struct ecryptfs_global_auth_tok *new_auth_tok; | |
1901 | int rc = 0; | |
1902 | ||
1903 | new_auth_tok = kmem_cache_alloc(ecryptfs_global_auth_tok_cache, | |
1904 | GFP_KERNEL); | |
1905 | if (!new_auth_tok) { | |
1906 | rc = -ENOMEM; | |
1907 | printk(KERN_ERR "Error allocating from " | |
1908 | "ecryptfs_global_auth_tok_cache\n"); | |
1909 | goto out; | |
1910 | } | |
1911 | memcpy(new_auth_tok->sig, sig, ECRYPTFS_SIG_SIZE_HEX); | |
1912 | new_auth_tok->sig[ECRYPTFS_SIG_SIZE_HEX] = '\0'; | |
1913 | mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex); | |
1914 | list_add(&new_auth_tok->mount_crypt_stat_list, | |
1915 | &mount_crypt_stat->global_auth_tok_list); | |
1916 | mount_crypt_stat->num_global_auth_toks++; | |
1917 | mutex_unlock(&mount_crypt_stat->global_auth_tok_list_mutex); | |
1918 | out: | |
1919 | return rc; | |
1920 | } | |
1921 |