Commit | Line | Data |
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7e70cb49 MZ |
1 | /* |
2 | * Copyright (C) 2010 IBM Corporation | |
4e561d38 RS |
3 | * Copyright (C) 2010 Politecnico di Torino, Italy |
4 | * TORSEC group -- http://security.polito.it | |
7e70cb49 | 5 | * |
4e561d38 | 6 | * Authors: |
7e70cb49 | 7 | * Mimi Zohar <zohar@us.ibm.com> |
4e561d38 | 8 | * Roberto Sassu <roberto.sassu@polito.it> |
7e70cb49 MZ |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation, version 2 of the License. | |
13 | * | |
d410fa4e | 14 | * See Documentation/security/keys-trusted-encrypted.txt |
7e70cb49 MZ |
15 | */ |
16 | ||
17 | #include <linux/uaccess.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/parser.h> | |
22 | #include <linux/string.h> | |
93ae86e7 | 23 | #include <linux/err.h> |
7e70cb49 MZ |
24 | #include <keys/user-type.h> |
25 | #include <keys/trusted-type.h> | |
26 | #include <keys/encrypted-type.h> | |
27 | #include <linux/key-type.h> | |
28 | #include <linux/random.h> | |
29 | #include <linux/rcupdate.h> | |
30 | #include <linux/scatterlist.h> | |
79a73d18 | 31 | #include <linux/ctype.h> |
7e70cb49 MZ |
32 | #include <crypto/hash.h> |
33 | #include <crypto/sha.h> | |
c3917fd9 | 34 | #include <crypto/skcipher.h> |
7e70cb49 | 35 | |
b9703449 | 36 | #include "encrypted.h" |
79a73d18 | 37 | #include "ecryptfs_format.h" |
7e70cb49 | 38 | |
3b1826ce MZ |
39 | static const char KEY_TRUSTED_PREFIX[] = "trusted:"; |
40 | static const char KEY_USER_PREFIX[] = "user:"; | |
7e70cb49 MZ |
41 | static const char hash_alg[] = "sha256"; |
42 | static const char hmac_alg[] = "hmac(sha256)"; | |
43 | static const char blkcipher_alg[] = "cbc(aes)"; | |
4e561d38 | 44 | static const char key_format_default[] = "default"; |
79a73d18 | 45 | static const char key_format_ecryptfs[] = "ecryptfs"; |
7e70cb49 MZ |
46 | static unsigned int ivsize; |
47 | static int blksize; | |
48 | ||
3b1826ce MZ |
49 | #define KEY_TRUSTED_PREFIX_LEN (sizeof (KEY_TRUSTED_PREFIX) - 1) |
50 | #define KEY_USER_PREFIX_LEN (sizeof (KEY_USER_PREFIX) - 1) | |
79a73d18 | 51 | #define KEY_ECRYPTFS_DESC_LEN 16 |
3b1826ce MZ |
52 | #define HASH_SIZE SHA256_DIGEST_SIZE |
53 | #define MAX_DATA_SIZE 4096 | |
54 | #define MIN_DATA_SIZE 20 | |
55 | ||
7e70cb49 MZ |
56 | struct sdesc { |
57 | struct shash_desc shash; | |
58 | char ctx[]; | |
59 | }; | |
60 | ||
61 | static struct crypto_shash *hashalg; | |
62 | static struct crypto_shash *hmacalg; | |
63 | ||
64 | enum { | |
65 | Opt_err = -1, Opt_new, Opt_load, Opt_update | |
66 | }; | |
67 | ||
4e561d38 | 68 | enum { |
79a73d18 | 69 | Opt_error = -1, Opt_default, Opt_ecryptfs |
4e561d38 RS |
70 | }; |
71 | ||
72 | static const match_table_t key_format_tokens = { | |
73 | {Opt_default, "default"}, | |
79a73d18 | 74 | {Opt_ecryptfs, "ecryptfs"}, |
4e561d38 RS |
75 | {Opt_error, NULL} |
76 | }; | |
77 | ||
7e70cb49 MZ |
78 | static const match_table_t key_tokens = { |
79 | {Opt_new, "new"}, | |
80 | {Opt_load, "load"}, | |
81 | {Opt_update, "update"}, | |
82 | {Opt_err, NULL} | |
83 | }; | |
84 | ||
85 | static int aes_get_sizes(void) | |
86 | { | |
c3917fd9 | 87 | struct crypto_skcipher *tfm; |
7e70cb49 | 88 | |
c3917fd9 | 89 | tfm = crypto_alloc_skcipher(blkcipher_alg, 0, CRYPTO_ALG_ASYNC); |
7e70cb49 MZ |
90 | if (IS_ERR(tfm)) { |
91 | pr_err("encrypted_key: failed to alloc_cipher (%ld)\n", | |
92 | PTR_ERR(tfm)); | |
93 | return PTR_ERR(tfm); | |
94 | } | |
c3917fd9 HX |
95 | ivsize = crypto_skcipher_ivsize(tfm); |
96 | blksize = crypto_skcipher_blocksize(tfm); | |
97 | crypto_free_skcipher(tfm); | |
7e70cb49 MZ |
98 | return 0; |
99 | } | |
100 | ||
79a73d18 RS |
101 | /* |
102 | * valid_ecryptfs_desc - verify the description of a new/loaded encrypted key | |
103 | * | |
104 | * The description of a encrypted key with format 'ecryptfs' must contain | |
105 | * exactly 16 hexadecimal characters. | |
106 | * | |
107 | */ | |
108 | static int valid_ecryptfs_desc(const char *ecryptfs_desc) | |
109 | { | |
110 | int i; | |
111 | ||
112 | if (strlen(ecryptfs_desc) != KEY_ECRYPTFS_DESC_LEN) { | |
113 | pr_err("encrypted_key: key description must be %d hexadecimal " | |
114 | "characters long\n", KEY_ECRYPTFS_DESC_LEN); | |
115 | return -EINVAL; | |
116 | } | |
117 | ||
118 | for (i = 0; i < KEY_ECRYPTFS_DESC_LEN; i++) { | |
119 | if (!isxdigit(ecryptfs_desc[i])) { | |
120 | pr_err("encrypted_key: key description must contain " | |
121 | "only hexadecimal characters\n"); | |
122 | return -EINVAL; | |
123 | } | |
124 | } | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
7e70cb49 MZ |
129 | /* |
130 | * valid_master_desc - verify the 'key-type:desc' of a new/updated master-key | |
131 | * | |
08fa2aa5 | 132 | * key-type:= "trusted:" | "user:" |
7e70cb49 MZ |
133 | * desc:= master-key description |
134 | * | |
135 | * Verify that 'key-type' is valid and that 'desc' exists. On key update, | |
136 | * only the master key description is permitted to change, not the key-type. | |
137 | * The key-type remains constant. | |
138 | * | |
139 | * On success returns 0, otherwise -EINVAL. | |
140 | */ | |
141 | static int valid_master_desc(const char *new_desc, const char *orig_desc) | |
142 | { | |
143 | if (!memcmp(new_desc, KEY_TRUSTED_PREFIX, KEY_TRUSTED_PREFIX_LEN)) { | |
144 | if (strlen(new_desc) == KEY_TRUSTED_PREFIX_LEN) | |
145 | goto out; | |
146 | if (orig_desc) | |
147 | if (memcmp(new_desc, orig_desc, KEY_TRUSTED_PREFIX_LEN)) | |
148 | goto out; | |
149 | } else if (!memcmp(new_desc, KEY_USER_PREFIX, KEY_USER_PREFIX_LEN)) { | |
150 | if (strlen(new_desc) == KEY_USER_PREFIX_LEN) | |
151 | goto out; | |
152 | if (orig_desc) | |
153 | if (memcmp(new_desc, orig_desc, KEY_USER_PREFIX_LEN)) | |
154 | goto out; | |
155 | } else | |
156 | goto out; | |
157 | return 0; | |
158 | out: | |
159 | return -EINVAL; | |
160 | } | |
161 | ||
162 | /* | |
163 | * datablob_parse - parse the keyctl data | |
164 | * | |
165 | * datablob format: | |
4e561d38 RS |
166 | * new [<format>] <master-key name> <decrypted data length> |
167 | * load [<format>] <master-key name> <decrypted data length> | |
168 | * <encrypted iv + data> | |
7e70cb49 MZ |
169 | * update <new-master-key name> |
170 | * | |
171 | * Tokenizes a copy of the keyctl data, returning a pointer to each token, | |
172 | * which is null terminated. | |
173 | * | |
174 | * On success returns 0, otherwise -EINVAL. | |
175 | */ | |
4e561d38 RS |
176 | static int datablob_parse(char *datablob, const char **format, |
177 | char **master_desc, char **decrypted_datalen, | |
178 | char **hex_encoded_iv) | |
7e70cb49 MZ |
179 | { |
180 | substring_t args[MAX_OPT_ARGS]; | |
181 | int ret = -EINVAL; | |
182 | int key_cmd; | |
4e561d38 RS |
183 | int key_format; |
184 | char *p, *keyword; | |
7e70cb49 | 185 | |
7103dff0 RS |
186 | keyword = strsep(&datablob, " \t"); |
187 | if (!keyword) { | |
188 | pr_info("encrypted_key: insufficient parameters specified\n"); | |
7e70cb49 | 189 | return ret; |
7103dff0 RS |
190 | } |
191 | key_cmd = match_token(keyword, key_tokens, args); | |
7e70cb49 | 192 | |
79a73d18 | 193 | /* Get optional format: default | ecryptfs */ |
4e561d38 RS |
194 | p = strsep(&datablob, " \t"); |
195 | if (!p) { | |
196 | pr_err("encrypted_key: insufficient parameters specified\n"); | |
197 | return ret; | |
198 | } | |
199 | ||
200 | key_format = match_token(p, key_format_tokens, args); | |
201 | switch (key_format) { | |
79a73d18 | 202 | case Opt_ecryptfs: |
4e561d38 RS |
203 | case Opt_default: |
204 | *format = p; | |
205 | *master_desc = strsep(&datablob, " \t"); | |
206 | break; | |
207 | case Opt_error: | |
208 | *master_desc = p; | |
209 | break; | |
210 | } | |
211 | ||
7103dff0 RS |
212 | if (!*master_desc) { |
213 | pr_info("encrypted_key: master key parameter is missing\n"); | |
7e70cb49 | 214 | goto out; |
7103dff0 | 215 | } |
7e70cb49 | 216 | |
7103dff0 RS |
217 | if (valid_master_desc(*master_desc, NULL) < 0) { |
218 | pr_info("encrypted_key: master key parameter \'%s\' " | |
219 | "is invalid\n", *master_desc); | |
7e70cb49 | 220 | goto out; |
7103dff0 | 221 | } |
7e70cb49 MZ |
222 | |
223 | if (decrypted_datalen) { | |
224 | *decrypted_datalen = strsep(&datablob, " \t"); | |
7103dff0 RS |
225 | if (!*decrypted_datalen) { |
226 | pr_info("encrypted_key: keylen parameter is missing\n"); | |
7e70cb49 | 227 | goto out; |
7103dff0 | 228 | } |
7e70cb49 MZ |
229 | } |
230 | ||
231 | switch (key_cmd) { | |
232 | case Opt_new: | |
7103dff0 RS |
233 | if (!decrypted_datalen) { |
234 | pr_info("encrypted_key: keyword \'%s\' not allowed " | |
235 | "when called from .update method\n", keyword); | |
7e70cb49 | 236 | break; |
7103dff0 | 237 | } |
7e70cb49 MZ |
238 | ret = 0; |
239 | break; | |
240 | case Opt_load: | |
7103dff0 RS |
241 | if (!decrypted_datalen) { |
242 | pr_info("encrypted_key: keyword \'%s\' not allowed " | |
243 | "when called from .update method\n", keyword); | |
7e70cb49 | 244 | break; |
7103dff0 | 245 | } |
7e70cb49 | 246 | *hex_encoded_iv = strsep(&datablob, " \t"); |
7103dff0 RS |
247 | if (!*hex_encoded_iv) { |
248 | pr_info("encrypted_key: hex blob is missing\n"); | |
7e70cb49 | 249 | break; |
7103dff0 | 250 | } |
7e70cb49 MZ |
251 | ret = 0; |
252 | break; | |
253 | case Opt_update: | |
7103dff0 RS |
254 | if (decrypted_datalen) { |
255 | pr_info("encrypted_key: keyword \'%s\' not allowed " | |
256 | "when called from .instantiate method\n", | |
257 | keyword); | |
7e70cb49 | 258 | break; |
7103dff0 | 259 | } |
7e70cb49 MZ |
260 | ret = 0; |
261 | break; | |
262 | case Opt_err: | |
7103dff0 RS |
263 | pr_info("encrypted_key: keyword \'%s\' not recognized\n", |
264 | keyword); | |
7e70cb49 MZ |
265 | break; |
266 | } | |
267 | out: | |
268 | return ret; | |
269 | } | |
270 | ||
271 | /* | |
272 | * datablob_format - format as an ascii string, before copying to userspace | |
273 | */ | |
274 | static char *datablob_format(struct encrypted_key_payload *epayload, | |
275 | size_t asciiblob_len) | |
276 | { | |
277 | char *ascii_buf, *bufp; | |
278 | u8 *iv = epayload->iv; | |
279 | int len; | |
280 | int i; | |
281 | ||
282 | ascii_buf = kmalloc(asciiblob_len + 1, GFP_KERNEL); | |
283 | if (!ascii_buf) | |
284 | goto out; | |
285 | ||
286 | ascii_buf[asciiblob_len] = '\0'; | |
287 | ||
288 | /* copy datablob master_desc and datalen strings */ | |
4e561d38 RS |
289 | len = sprintf(ascii_buf, "%s %s %s ", epayload->format, |
290 | epayload->master_desc, epayload->datalen); | |
7e70cb49 MZ |
291 | |
292 | /* convert the hex encoded iv, encrypted-data and HMAC to ascii */ | |
293 | bufp = &ascii_buf[len]; | |
294 | for (i = 0; i < (asciiblob_len - len) / 2; i++) | |
02473119 | 295 | bufp = hex_byte_pack(bufp, iv[i]); |
7e70cb49 MZ |
296 | out: |
297 | return ascii_buf; | |
298 | } | |
299 | ||
7e70cb49 MZ |
300 | /* |
301 | * request_user_key - request the user key | |
302 | * | |
303 | * Use a user provided key to encrypt/decrypt an encrypted-key. | |
304 | */ | |
146aa8b1 | 305 | static struct key *request_user_key(const char *master_desc, const u8 **master_key, |
3b1826ce | 306 | size_t *master_keylen) |
7e70cb49 | 307 | { |
146aa8b1 | 308 | const struct user_key_payload *upayload; |
7e70cb49 MZ |
309 | struct key *ukey; |
310 | ||
311 | ukey = request_key(&key_type_user, master_desc, NULL); | |
312 | if (IS_ERR(ukey)) | |
313 | goto error; | |
314 | ||
315 | down_read(&ukey->sem); | |
146aa8b1 | 316 | upayload = user_key_payload(ukey); |
7e70cb49 MZ |
317 | *master_key = upayload->data; |
318 | *master_keylen = upayload->datalen; | |
319 | error: | |
320 | return ukey; | |
321 | } | |
322 | ||
3b1826ce | 323 | static struct sdesc *alloc_sdesc(struct crypto_shash *alg) |
7e70cb49 MZ |
324 | { |
325 | struct sdesc *sdesc; | |
326 | int size; | |
327 | ||
328 | size = sizeof(struct shash_desc) + crypto_shash_descsize(alg); | |
329 | sdesc = kmalloc(size, GFP_KERNEL); | |
330 | if (!sdesc) | |
331 | return ERR_PTR(-ENOMEM); | |
332 | sdesc->shash.tfm = alg; | |
333 | sdesc->shash.flags = 0x0; | |
334 | return sdesc; | |
335 | } | |
336 | ||
3b1826ce MZ |
337 | static int calc_hmac(u8 *digest, const u8 *key, unsigned int keylen, |
338 | const u8 *buf, unsigned int buflen) | |
7e70cb49 MZ |
339 | { |
340 | struct sdesc *sdesc; | |
341 | int ret; | |
342 | ||
3b1826ce | 343 | sdesc = alloc_sdesc(hmacalg); |
7e70cb49 MZ |
344 | if (IS_ERR(sdesc)) { |
345 | pr_info("encrypted_key: can't alloc %s\n", hmac_alg); | |
346 | return PTR_ERR(sdesc); | |
347 | } | |
348 | ||
349 | ret = crypto_shash_setkey(hmacalg, key, keylen); | |
350 | if (!ret) | |
351 | ret = crypto_shash_digest(&sdesc->shash, buf, buflen, digest); | |
352 | kfree(sdesc); | |
353 | return ret; | |
354 | } | |
355 | ||
3b1826ce | 356 | static int calc_hash(u8 *digest, const u8 *buf, unsigned int buflen) |
7e70cb49 MZ |
357 | { |
358 | struct sdesc *sdesc; | |
359 | int ret; | |
360 | ||
3b1826ce | 361 | sdesc = alloc_sdesc(hashalg); |
7e70cb49 MZ |
362 | if (IS_ERR(sdesc)) { |
363 | pr_info("encrypted_key: can't alloc %s\n", hash_alg); | |
364 | return PTR_ERR(sdesc); | |
365 | } | |
366 | ||
367 | ret = crypto_shash_digest(&sdesc->shash, buf, buflen, digest); | |
368 | kfree(sdesc); | |
369 | return ret; | |
370 | } | |
371 | ||
372 | enum derived_key_type { ENC_KEY, AUTH_KEY }; | |
373 | ||
374 | /* Derive authentication/encryption key from trusted key */ | |
375 | static int get_derived_key(u8 *derived_key, enum derived_key_type key_type, | |
3b1826ce | 376 | const u8 *master_key, size_t master_keylen) |
7e70cb49 MZ |
377 | { |
378 | u8 *derived_buf; | |
379 | unsigned int derived_buf_len; | |
380 | int ret; | |
381 | ||
382 | derived_buf_len = strlen("AUTH_KEY") + 1 + master_keylen; | |
383 | if (derived_buf_len < HASH_SIZE) | |
384 | derived_buf_len = HASH_SIZE; | |
385 | ||
386 | derived_buf = kzalloc(derived_buf_len, GFP_KERNEL); | |
387 | if (!derived_buf) { | |
388 | pr_err("encrypted_key: out of memory\n"); | |
389 | return -ENOMEM; | |
390 | } | |
391 | if (key_type) | |
392 | strcpy(derived_buf, "AUTH_KEY"); | |
393 | else | |
394 | strcpy(derived_buf, "ENC_KEY"); | |
395 | ||
396 | memcpy(derived_buf + strlen(derived_buf) + 1, master_key, | |
397 | master_keylen); | |
398 | ret = calc_hash(derived_key, derived_buf, derived_buf_len); | |
399 | kfree(derived_buf); | |
400 | return ret; | |
401 | } | |
402 | ||
c3917fd9 HX |
403 | static struct skcipher_request *init_skcipher_req(const u8 *key, |
404 | unsigned int key_len) | |
7e70cb49 | 405 | { |
c3917fd9 HX |
406 | struct skcipher_request *req; |
407 | struct crypto_skcipher *tfm; | |
7e70cb49 MZ |
408 | int ret; |
409 | ||
c3917fd9 HX |
410 | tfm = crypto_alloc_skcipher(blkcipher_alg, 0, CRYPTO_ALG_ASYNC); |
411 | if (IS_ERR(tfm)) { | |
7e70cb49 | 412 | pr_err("encrypted_key: failed to load %s transform (%ld)\n", |
c3917fd9 HX |
413 | blkcipher_alg, PTR_ERR(tfm)); |
414 | return ERR_CAST(tfm); | |
7e70cb49 | 415 | } |
7e70cb49 | 416 | |
c3917fd9 | 417 | ret = crypto_skcipher_setkey(tfm, key, key_len); |
7e70cb49 MZ |
418 | if (ret < 0) { |
419 | pr_err("encrypted_key: failed to setkey (%d)\n", ret); | |
c3917fd9 HX |
420 | crypto_free_skcipher(tfm); |
421 | return ERR_PTR(ret); | |
7e70cb49 | 422 | } |
c3917fd9 HX |
423 | |
424 | req = skcipher_request_alloc(tfm, GFP_KERNEL); | |
425 | if (!req) { | |
426 | pr_err("encrypted_key: failed to allocate request for %s\n", | |
427 | blkcipher_alg); | |
428 | crypto_free_skcipher(tfm); | |
429 | return ERR_PTR(-ENOMEM); | |
430 | } | |
431 | ||
432 | skcipher_request_set_callback(req, 0, NULL, NULL); | |
433 | return req; | |
7e70cb49 MZ |
434 | } |
435 | ||
436 | static struct key *request_master_key(struct encrypted_key_payload *epayload, | |
146aa8b1 | 437 | const u8 **master_key, size_t *master_keylen) |
7e70cb49 MZ |
438 | { |
439 | struct key *mkey = NULL; | |
440 | ||
441 | if (!strncmp(epayload->master_desc, KEY_TRUSTED_PREFIX, | |
442 | KEY_TRUSTED_PREFIX_LEN)) { | |
443 | mkey = request_trusted_key(epayload->master_desc + | |
444 | KEY_TRUSTED_PREFIX_LEN, | |
445 | master_key, master_keylen); | |
446 | } else if (!strncmp(epayload->master_desc, KEY_USER_PREFIX, | |
447 | KEY_USER_PREFIX_LEN)) { | |
448 | mkey = request_user_key(epayload->master_desc + | |
449 | KEY_USER_PREFIX_LEN, | |
450 | master_key, master_keylen); | |
451 | } else | |
452 | goto out; | |
453 | ||
f91c2c5c | 454 | if (IS_ERR(mkey)) { |
f4a0d5ab | 455 | int ret = PTR_ERR(mkey); |
982e617a MZ |
456 | |
457 | if (ret == -ENOTSUPP) | |
458 | pr_info("encrypted_key: key %s not supported", | |
459 | epayload->master_desc); | |
460 | else | |
461 | pr_info("encrypted_key: key %s not found", | |
462 | epayload->master_desc); | |
f91c2c5c RS |
463 | goto out; |
464 | } | |
465 | ||
466 | dump_master_key(*master_key, *master_keylen); | |
7e70cb49 MZ |
467 | out: |
468 | return mkey; | |
469 | } | |
470 | ||
471 | /* Before returning data to userspace, encrypt decrypted data. */ | |
472 | static int derived_key_encrypt(struct encrypted_key_payload *epayload, | |
473 | const u8 *derived_key, | |
3b1826ce | 474 | unsigned int derived_keylen) |
7e70cb49 MZ |
475 | { |
476 | struct scatterlist sg_in[2]; | |
477 | struct scatterlist sg_out[1]; | |
c3917fd9 HX |
478 | struct crypto_skcipher *tfm; |
479 | struct skcipher_request *req; | |
7e70cb49 MZ |
480 | unsigned int encrypted_datalen; |
481 | unsigned int padlen; | |
482 | char pad[16]; | |
483 | int ret; | |
484 | ||
485 | encrypted_datalen = roundup(epayload->decrypted_datalen, blksize); | |
486 | padlen = encrypted_datalen - epayload->decrypted_datalen; | |
487 | ||
c3917fd9 HX |
488 | req = init_skcipher_req(derived_key, derived_keylen); |
489 | ret = PTR_ERR(req); | |
490 | if (IS_ERR(req)) | |
7e70cb49 MZ |
491 | goto out; |
492 | dump_decrypted_data(epayload); | |
493 | ||
494 | memset(pad, 0, sizeof pad); | |
495 | sg_init_table(sg_in, 2); | |
496 | sg_set_buf(&sg_in[0], epayload->decrypted_data, | |
497 | epayload->decrypted_datalen); | |
498 | sg_set_buf(&sg_in[1], pad, padlen); | |
499 | ||
500 | sg_init_table(sg_out, 1); | |
501 | sg_set_buf(sg_out, epayload->encrypted_data, encrypted_datalen); | |
502 | ||
c3917fd9 HX |
503 | skcipher_request_set_crypt(req, sg_in, sg_out, encrypted_datalen, |
504 | epayload->iv); | |
505 | ret = crypto_skcipher_encrypt(req); | |
506 | tfm = crypto_skcipher_reqtfm(req); | |
507 | skcipher_request_free(req); | |
508 | crypto_free_skcipher(tfm); | |
7e70cb49 MZ |
509 | if (ret < 0) |
510 | pr_err("encrypted_key: failed to encrypt (%d)\n", ret); | |
511 | else | |
512 | dump_encrypted_data(epayload, encrypted_datalen); | |
513 | out: | |
514 | return ret; | |
515 | } | |
516 | ||
517 | static int datablob_hmac_append(struct encrypted_key_payload *epayload, | |
3b1826ce | 518 | const u8 *master_key, size_t master_keylen) |
7e70cb49 MZ |
519 | { |
520 | u8 derived_key[HASH_SIZE]; | |
521 | u8 *digest; | |
522 | int ret; | |
523 | ||
524 | ret = get_derived_key(derived_key, AUTH_KEY, master_key, master_keylen); | |
525 | if (ret < 0) | |
526 | goto out; | |
527 | ||
4e561d38 | 528 | digest = epayload->format + epayload->datablob_len; |
7e70cb49 | 529 | ret = calc_hmac(digest, derived_key, sizeof derived_key, |
4e561d38 | 530 | epayload->format, epayload->datablob_len); |
7e70cb49 MZ |
531 | if (!ret) |
532 | dump_hmac(NULL, digest, HASH_SIZE); | |
533 | out: | |
534 | return ret; | |
535 | } | |
536 | ||
537 | /* verify HMAC before decrypting encrypted key */ | |
538 | static int datablob_hmac_verify(struct encrypted_key_payload *epayload, | |
4e561d38 RS |
539 | const u8 *format, const u8 *master_key, |
540 | size_t master_keylen) | |
7e70cb49 MZ |
541 | { |
542 | u8 derived_key[HASH_SIZE]; | |
543 | u8 digest[HASH_SIZE]; | |
544 | int ret; | |
4e561d38 RS |
545 | char *p; |
546 | unsigned short len; | |
7e70cb49 MZ |
547 | |
548 | ret = get_derived_key(derived_key, AUTH_KEY, master_key, master_keylen); | |
549 | if (ret < 0) | |
550 | goto out; | |
551 | ||
4e561d38 RS |
552 | len = epayload->datablob_len; |
553 | if (!format) { | |
554 | p = epayload->master_desc; | |
555 | len -= strlen(epayload->format) + 1; | |
556 | } else | |
557 | p = epayload->format; | |
558 | ||
559 | ret = calc_hmac(digest, derived_key, sizeof derived_key, p, len); | |
7e70cb49 MZ |
560 | if (ret < 0) |
561 | goto out; | |
4e561d38 | 562 | ret = memcmp(digest, epayload->format + epayload->datablob_len, |
7e70cb49 MZ |
563 | sizeof digest); |
564 | if (ret) { | |
565 | ret = -EINVAL; | |
566 | dump_hmac("datablob", | |
4e561d38 | 567 | epayload->format + epayload->datablob_len, |
7e70cb49 MZ |
568 | HASH_SIZE); |
569 | dump_hmac("calc", digest, HASH_SIZE); | |
570 | } | |
571 | out: | |
572 | return ret; | |
573 | } | |
574 | ||
575 | static int derived_key_decrypt(struct encrypted_key_payload *epayload, | |
576 | const u8 *derived_key, | |
3b1826ce | 577 | unsigned int derived_keylen) |
7e70cb49 MZ |
578 | { |
579 | struct scatterlist sg_in[1]; | |
580 | struct scatterlist sg_out[2]; | |
c3917fd9 HX |
581 | struct crypto_skcipher *tfm; |
582 | struct skcipher_request *req; | |
7e70cb49 MZ |
583 | unsigned int encrypted_datalen; |
584 | char pad[16]; | |
585 | int ret; | |
586 | ||
587 | encrypted_datalen = roundup(epayload->decrypted_datalen, blksize); | |
c3917fd9 HX |
588 | req = init_skcipher_req(derived_key, derived_keylen); |
589 | ret = PTR_ERR(req); | |
590 | if (IS_ERR(req)) | |
7e70cb49 MZ |
591 | goto out; |
592 | dump_encrypted_data(epayload, encrypted_datalen); | |
593 | ||
594 | memset(pad, 0, sizeof pad); | |
595 | sg_init_table(sg_in, 1); | |
596 | sg_init_table(sg_out, 2); | |
597 | sg_set_buf(sg_in, epayload->encrypted_data, encrypted_datalen); | |
598 | sg_set_buf(&sg_out[0], epayload->decrypted_data, | |
3b1826ce | 599 | epayload->decrypted_datalen); |
7e70cb49 MZ |
600 | sg_set_buf(&sg_out[1], pad, sizeof pad); |
601 | ||
c3917fd9 HX |
602 | skcipher_request_set_crypt(req, sg_in, sg_out, encrypted_datalen, |
603 | epayload->iv); | |
604 | ret = crypto_skcipher_decrypt(req); | |
605 | tfm = crypto_skcipher_reqtfm(req); | |
606 | skcipher_request_free(req); | |
607 | crypto_free_skcipher(tfm); | |
7e70cb49 MZ |
608 | if (ret < 0) |
609 | goto out; | |
610 | dump_decrypted_data(epayload); | |
611 | out: | |
612 | return ret; | |
613 | } | |
614 | ||
615 | /* Allocate memory for decrypted key and datablob. */ | |
616 | static struct encrypted_key_payload *encrypted_key_alloc(struct key *key, | |
4e561d38 | 617 | const char *format, |
7e70cb49 MZ |
618 | const char *master_desc, |
619 | const char *datalen) | |
620 | { | |
621 | struct encrypted_key_payload *epayload = NULL; | |
622 | unsigned short datablob_len; | |
623 | unsigned short decrypted_datalen; | |
4e561d38 | 624 | unsigned short payload_datalen; |
7e70cb49 | 625 | unsigned int encrypted_datalen; |
4e561d38 | 626 | unsigned int format_len; |
7e70cb49 MZ |
627 | long dlen; |
628 | int ret; | |
629 | ||
29707b20 | 630 | ret = kstrtol(datalen, 10, &dlen); |
7e70cb49 MZ |
631 | if (ret < 0 || dlen < MIN_DATA_SIZE || dlen > MAX_DATA_SIZE) |
632 | return ERR_PTR(-EINVAL); | |
633 | ||
4e561d38 | 634 | format_len = (!format) ? strlen(key_format_default) : strlen(format); |
7e70cb49 | 635 | decrypted_datalen = dlen; |
4e561d38 | 636 | payload_datalen = decrypted_datalen; |
79a73d18 RS |
637 | if (format && !strcmp(format, key_format_ecryptfs)) { |
638 | if (dlen != ECRYPTFS_MAX_KEY_BYTES) { | |
639 | pr_err("encrypted_key: keylen for the ecryptfs format " | |
640 | "must be equal to %d bytes\n", | |
641 | ECRYPTFS_MAX_KEY_BYTES); | |
642 | return ERR_PTR(-EINVAL); | |
643 | } | |
644 | decrypted_datalen = ECRYPTFS_MAX_KEY_BYTES; | |
645 | payload_datalen = sizeof(struct ecryptfs_auth_tok); | |
646 | } | |
647 | ||
7e70cb49 MZ |
648 | encrypted_datalen = roundup(decrypted_datalen, blksize); |
649 | ||
4e561d38 RS |
650 | datablob_len = format_len + 1 + strlen(master_desc) + 1 |
651 | + strlen(datalen) + 1 + ivsize + 1 + encrypted_datalen; | |
7e70cb49 | 652 | |
4e561d38 | 653 | ret = key_payload_reserve(key, payload_datalen + datablob_len |
7e70cb49 MZ |
654 | + HASH_SIZE + 1); |
655 | if (ret < 0) | |
656 | return ERR_PTR(ret); | |
657 | ||
4e561d38 | 658 | epayload = kzalloc(sizeof(*epayload) + payload_datalen + |
7e70cb49 MZ |
659 | datablob_len + HASH_SIZE + 1, GFP_KERNEL); |
660 | if (!epayload) | |
661 | return ERR_PTR(-ENOMEM); | |
662 | ||
4e561d38 | 663 | epayload->payload_datalen = payload_datalen; |
7e70cb49 MZ |
664 | epayload->decrypted_datalen = decrypted_datalen; |
665 | epayload->datablob_len = datablob_len; | |
666 | return epayload; | |
667 | } | |
668 | ||
669 | static int encrypted_key_decrypt(struct encrypted_key_payload *epayload, | |
4e561d38 | 670 | const char *format, const char *hex_encoded_iv) |
7e70cb49 MZ |
671 | { |
672 | struct key *mkey; | |
673 | u8 derived_key[HASH_SIZE]; | |
146aa8b1 | 674 | const u8 *master_key; |
7e70cb49 | 675 | u8 *hmac; |
1f35065a | 676 | const char *hex_encoded_data; |
7e70cb49 | 677 | unsigned int encrypted_datalen; |
3b1826ce | 678 | size_t master_keylen; |
1f35065a | 679 | size_t asciilen; |
7e70cb49 MZ |
680 | int ret; |
681 | ||
682 | encrypted_datalen = roundup(epayload->decrypted_datalen, blksize); | |
1f35065a MZ |
683 | asciilen = (ivsize + 1 + encrypted_datalen + HASH_SIZE) * 2; |
684 | if (strlen(hex_encoded_iv) != asciilen) | |
685 | return -EINVAL; | |
686 | ||
687 | hex_encoded_data = hex_encoded_iv + (2 * ivsize) + 2; | |
2b3ff631 MZ |
688 | ret = hex2bin(epayload->iv, hex_encoded_iv, ivsize); |
689 | if (ret < 0) | |
690 | return -EINVAL; | |
691 | ret = hex2bin(epayload->encrypted_data, hex_encoded_data, | |
692 | encrypted_datalen); | |
693 | if (ret < 0) | |
694 | return -EINVAL; | |
7e70cb49 | 695 | |
4e561d38 | 696 | hmac = epayload->format + epayload->datablob_len; |
2b3ff631 MZ |
697 | ret = hex2bin(hmac, hex_encoded_data + (encrypted_datalen * 2), |
698 | HASH_SIZE); | |
699 | if (ret < 0) | |
700 | return -EINVAL; | |
7e70cb49 MZ |
701 | |
702 | mkey = request_master_key(epayload, &master_key, &master_keylen); | |
703 | if (IS_ERR(mkey)) | |
704 | return PTR_ERR(mkey); | |
705 | ||
4e561d38 | 706 | ret = datablob_hmac_verify(epayload, format, master_key, master_keylen); |
7e70cb49 MZ |
707 | if (ret < 0) { |
708 | pr_err("encrypted_key: bad hmac (%d)\n", ret); | |
709 | goto out; | |
710 | } | |
711 | ||
712 | ret = get_derived_key(derived_key, ENC_KEY, master_key, master_keylen); | |
713 | if (ret < 0) | |
714 | goto out; | |
715 | ||
716 | ret = derived_key_decrypt(epayload, derived_key, sizeof derived_key); | |
717 | if (ret < 0) | |
718 | pr_err("encrypted_key: failed to decrypt key (%d)\n", ret); | |
719 | out: | |
720 | up_read(&mkey->sem); | |
721 | key_put(mkey); | |
722 | return ret; | |
723 | } | |
724 | ||
725 | static void __ekey_init(struct encrypted_key_payload *epayload, | |
4e561d38 RS |
726 | const char *format, const char *master_desc, |
727 | const char *datalen) | |
7e70cb49 | 728 | { |
4e561d38 RS |
729 | unsigned int format_len; |
730 | ||
731 | format_len = (!format) ? strlen(key_format_default) : strlen(format); | |
732 | epayload->format = epayload->payload_data + epayload->payload_datalen; | |
733 | epayload->master_desc = epayload->format + format_len + 1; | |
7e70cb49 MZ |
734 | epayload->datalen = epayload->master_desc + strlen(master_desc) + 1; |
735 | epayload->iv = epayload->datalen + strlen(datalen) + 1; | |
736 | epayload->encrypted_data = epayload->iv + ivsize + 1; | |
4e561d38 | 737 | epayload->decrypted_data = epayload->payload_data; |
7e70cb49 | 738 | |
4e561d38 RS |
739 | if (!format) |
740 | memcpy(epayload->format, key_format_default, format_len); | |
79a73d18 RS |
741 | else { |
742 | if (!strcmp(format, key_format_ecryptfs)) | |
743 | epayload->decrypted_data = | |
744 | ecryptfs_get_auth_tok_key((struct ecryptfs_auth_tok *)epayload->payload_data); | |
745 | ||
4e561d38 | 746 | memcpy(epayload->format, format, format_len); |
79a73d18 RS |
747 | } |
748 | ||
7e70cb49 MZ |
749 | memcpy(epayload->master_desc, master_desc, strlen(master_desc)); |
750 | memcpy(epayload->datalen, datalen, strlen(datalen)); | |
751 | } | |
752 | ||
753 | /* | |
754 | * encrypted_init - initialize an encrypted key | |
755 | * | |
756 | * For a new key, use a random number for both the iv and data | |
757 | * itself. For an old key, decrypt the hex encoded data. | |
758 | */ | |
759 | static int encrypted_init(struct encrypted_key_payload *epayload, | |
79a73d18 RS |
760 | const char *key_desc, const char *format, |
761 | const char *master_desc, const char *datalen, | |
762 | const char *hex_encoded_iv) | |
7e70cb49 MZ |
763 | { |
764 | int ret = 0; | |
765 | ||
79a73d18 RS |
766 | if (format && !strcmp(format, key_format_ecryptfs)) { |
767 | ret = valid_ecryptfs_desc(key_desc); | |
768 | if (ret < 0) | |
769 | return ret; | |
770 | ||
771 | ecryptfs_fill_auth_tok((struct ecryptfs_auth_tok *)epayload->payload_data, | |
772 | key_desc); | |
773 | } | |
774 | ||
4e561d38 | 775 | __ekey_init(epayload, format, master_desc, datalen); |
1f35065a | 776 | if (!hex_encoded_iv) { |
7e70cb49 MZ |
777 | get_random_bytes(epayload->iv, ivsize); |
778 | ||
779 | get_random_bytes(epayload->decrypted_data, | |
780 | epayload->decrypted_datalen); | |
781 | } else | |
4e561d38 | 782 | ret = encrypted_key_decrypt(epayload, format, hex_encoded_iv); |
7e70cb49 MZ |
783 | return ret; |
784 | } | |
785 | ||
786 | /* | |
787 | * encrypted_instantiate - instantiate an encrypted key | |
788 | * | |
789 | * Decrypt an existing encrypted datablob or create a new encrypted key | |
790 | * based on a kernel random number. | |
791 | * | |
792 | * On success, return 0. Otherwise return errno. | |
793 | */ | |
cf7f601c DH |
794 | static int encrypted_instantiate(struct key *key, |
795 | struct key_preparsed_payload *prep) | |
7e70cb49 MZ |
796 | { |
797 | struct encrypted_key_payload *epayload = NULL; | |
798 | char *datablob = NULL; | |
4e561d38 | 799 | const char *format = NULL; |
7e70cb49 MZ |
800 | char *master_desc = NULL; |
801 | char *decrypted_datalen = NULL; | |
802 | char *hex_encoded_iv = NULL; | |
cf7f601c | 803 | size_t datalen = prep->datalen; |
7e70cb49 MZ |
804 | int ret; |
805 | ||
cf7f601c | 806 | if (datalen <= 0 || datalen > 32767 || !prep->data) |
7e70cb49 MZ |
807 | return -EINVAL; |
808 | ||
809 | datablob = kmalloc(datalen + 1, GFP_KERNEL); | |
810 | if (!datablob) | |
811 | return -ENOMEM; | |
812 | datablob[datalen] = 0; | |
cf7f601c | 813 | memcpy(datablob, prep->data, datalen); |
4e561d38 RS |
814 | ret = datablob_parse(datablob, &format, &master_desc, |
815 | &decrypted_datalen, &hex_encoded_iv); | |
7e70cb49 MZ |
816 | if (ret < 0) |
817 | goto out; | |
818 | ||
4e561d38 RS |
819 | epayload = encrypted_key_alloc(key, format, master_desc, |
820 | decrypted_datalen); | |
7e70cb49 MZ |
821 | if (IS_ERR(epayload)) { |
822 | ret = PTR_ERR(epayload); | |
823 | goto out; | |
824 | } | |
79a73d18 RS |
825 | ret = encrypted_init(epayload, key->description, format, master_desc, |
826 | decrypted_datalen, hex_encoded_iv); | |
7e70cb49 MZ |
827 | if (ret < 0) { |
828 | kfree(epayload); | |
829 | goto out; | |
830 | } | |
831 | ||
b64cc5fb | 832 | rcu_assign_keypointer(key, epayload); |
7e70cb49 MZ |
833 | out: |
834 | kfree(datablob); | |
835 | return ret; | |
836 | } | |
837 | ||
838 | static void encrypted_rcu_free(struct rcu_head *rcu) | |
839 | { | |
840 | struct encrypted_key_payload *epayload; | |
841 | ||
842 | epayload = container_of(rcu, struct encrypted_key_payload, rcu); | |
843 | memset(epayload->decrypted_data, 0, epayload->decrypted_datalen); | |
844 | kfree(epayload); | |
845 | } | |
846 | ||
847 | /* | |
848 | * encrypted_update - update the master key description | |
849 | * | |
850 | * Change the master key description for an existing encrypted key. | |
851 | * The next read will return an encrypted datablob using the new | |
852 | * master key description. | |
853 | * | |
854 | * On success, return 0. Otherwise return errno. | |
855 | */ | |
cf7f601c | 856 | static int encrypted_update(struct key *key, struct key_preparsed_payload *prep) |
7e70cb49 | 857 | { |
146aa8b1 | 858 | struct encrypted_key_payload *epayload = key->payload.data[0]; |
7e70cb49 MZ |
859 | struct encrypted_key_payload *new_epayload; |
860 | char *buf; | |
861 | char *new_master_desc = NULL; | |
4e561d38 | 862 | const char *format = NULL; |
cf7f601c | 863 | size_t datalen = prep->datalen; |
7e70cb49 MZ |
864 | int ret = 0; |
865 | ||
096fe9ea DH |
866 | if (test_bit(KEY_FLAG_NEGATIVE, &key->flags)) |
867 | return -ENOKEY; | |
cf7f601c | 868 | if (datalen <= 0 || datalen > 32767 || !prep->data) |
7e70cb49 MZ |
869 | return -EINVAL; |
870 | ||
871 | buf = kmalloc(datalen + 1, GFP_KERNEL); | |
872 | if (!buf) | |
873 | return -ENOMEM; | |
874 | ||
875 | buf[datalen] = 0; | |
cf7f601c | 876 | memcpy(buf, prep->data, datalen); |
4e561d38 | 877 | ret = datablob_parse(buf, &format, &new_master_desc, NULL, NULL); |
7e70cb49 MZ |
878 | if (ret < 0) |
879 | goto out; | |
880 | ||
881 | ret = valid_master_desc(new_master_desc, epayload->master_desc); | |
882 | if (ret < 0) | |
883 | goto out; | |
884 | ||
4e561d38 RS |
885 | new_epayload = encrypted_key_alloc(key, epayload->format, |
886 | new_master_desc, epayload->datalen); | |
7e70cb49 MZ |
887 | if (IS_ERR(new_epayload)) { |
888 | ret = PTR_ERR(new_epayload); | |
889 | goto out; | |
890 | } | |
891 | ||
4e561d38 RS |
892 | __ekey_init(new_epayload, epayload->format, new_master_desc, |
893 | epayload->datalen); | |
7e70cb49 MZ |
894 | |
895 | memcpy(new_epayload->iv, epayload->iv, ivsize); | |
4e561d38 RS |
896 | memcpy(new_epayload->payload_data, epayload->payload_data, |
897 | epayload->payload_datalen); | |
7e70cb49 | 898 | |
ee0b31a2 | 899 | rcu_assign_keypointer(key, new_epayload); |
7e70cb49 MZ |
900 | call_rcu(&epayload->rcu, encrypted_rcu_free); |
901 | out: | |
902 | kfree(buf); | |
903 | return ret; | |
904 | } | |
905 | ||
906 | /* | |
907 | * encrypted_read - format and copy the encrypted data to userspace | |
908 | * | |
909 | * The resulting datablob format is: | |
910 | * <master-key name> <decrypted data length> <encrypted iv> <encrypted data> | |
911 | * | |
912 | * On success, return to userspace the encrypted key datablob size. | |
913 | */ | |
914 | static long encrypted_read(const struct key *key, char __user *buffer, | |
915 | size_t buflen) | |
916 | { | |
917 | struct encrypted_key_payload *epayload; | |
918 | struct key *mkey; | |
146aa8b1 | 919 | const u8 *master_key; |
3b1826ce | 920 | size_t master_keylen; |
7e70cb49 MZ |
921 | char derived_key[HASH_SIZE]; |
922 | char *ascii_buf; | |
923 | size_t asciiblob_len; | |
924 | int ret; | |
925 | ||
633e804e | 926 | epayload = rcu_dereference_key(key); |
7e70cb49 MZ |
927 | |
928 | /* returns the hex encoded iv, encrypted-data, and hmac as ascii */ | |
929 | asciiblob_len = epayload->datablob_len + ivsize + 1 | |
930 | + roundup(epayload->decrypted_datalen, blksize) | |
931 | + (HASH_SIZE * 2); | |
932 | ||
933 | if (!buffer || buflen < asciiblob_len) | |
934 | return asciiblob_len; | |
935 | ||
936 | mkey = request_master_key(epayload, &master_key, &master_keylen); | |
937 | if (IS_ERR(mkey)) | |
938 | return PTR_ERR(mkey); | |
939 | ||
940 | ret = get_derived_key(derived_key, ENC_KEY, master_key, master_keylen); | |
941 | if (ret < 0) | |
942 | goto out; | |
943 | ||
944 | ret = derived_key_encrypt(epayload, derived_key, sizeof derived_key); | |
945 | if (ret < 0) | |
946 | goto out; | |
947 | ||
948 | ret = datablob_hmac_append(epayload, master_key, master_keylen); | |
949 | if (ret < 0) | |
950 | goto out; | |
951 | ||
952 | ascii_buf = datablob_format(epayload, asciiblob_len); | |
953 | if (!ascii_buf) { | |
954 | ret = -ENOMEM; | |
955 | goto out; | |
956 | } | |
957 | ||
958 | up_read(&mkey->sem); | |
959 | key_put(mkey); | |
960 | ||
961 | if (copy_to_user(buffer, ascii_buf, asciiblob_len) != 0) | |
962 | ret = -EFAULT; | |
963 | kfree(ascii_buf); | |
964 | ||
965 | return asciiblob_len; | |
966 | out: | |
967 | up_read(&mkey->sem); | |
968 | key_put(mkey); | |
969 | return ret; | |
970 | } | |
971 | ||
972 | /* | |
973 | * encrypted_destroy - before freeing the key, clear the decrypted data | |
974 | * | |
975 | * Before freeing the key, clear the memory containing the decrypted | |
976 | * key data. | |
977 | */ | |
978 | static void encrypted_destroy(struct key *key) | |
979 | { | |
146aa8b1 | 980 | struct encrypted_key_payload *epayload = key->payload.data[0]; |
7e70cb49 MZ |
981 | |
982 | if (!epayload) | |
983 | return; | |
984 | ||
985 | memset(epayload->decrypted_data, 0, epayload->decrypted_datalen); | |
146aa8b1 | 986 | kfree(key->payload.data[0]); |
7e70cb49 MZ |
987 | } |
988 | ||
989 | struct key_type key_type_encrypted = { | |
990 | .name = "encrypted", | |
991 | .instantiate = encrypted_instantiate, | |
992 | .update = encrypted_update, | |
7e70cb49 MZ |
993 | .destroy = encrypted_destroy, |
994 | .describe = user_describe, | |
995 | .read = encrypted_read, | |
996 | }; | |
997 | EXPORT_SYMBOL_GPL(key_type_encrypted); | |
998 | ||
999 | static void encrypted_shash_release(void) | |
1000 | { | |
1001 | if (hashalg) | |
1002 | crypto_free_shash(hashalg); | |
1003 | if (hmacalg) | |
1004 | crypto_free_shash(hmacalg); | |
1005 | } | |
1006 | ||
1007 | static int __init encrypted_shash_alloc(void) | |
1008 | { | |
1009 | int ret; | |
1010 | ||
1011 | hmacalg = crypto_alloc_shash(hmac_alg, 0, CRYPTO_ALG_ASYNC); | |
1012 | if (IS_ERR(hmacalg)) { | |
1013 | pr_info("encrypted_key: could not allocate crypto %s\n", | |
1014 | hmac_alg); | |
1015 | return PTR_ERR(hmacalg); | |
1016 | } | |
1017 | ||
1018 | hashalg = crypto_alloc_shash(hash_alg, 0, CRYPTO_ALG_ASYNC); | |
1019 | if (IS_ERR(hashalg)) { | |
1020 | pr_info("encrypted_key: could not allocate crypto %s\n", | |
1021 | hash_alg); | |
1022 | ret = PTR_ERR(hashalg); | |
1023 | goto hashalg_fail; | |
1024 | } | |
1025 | ||
1026 | return 0; | |
1027 | ||
1028 | hashalg_fail: | |
1029 | crypto_free_shash(hmacalg); | |
1030 | return ret; | |
1031 | } | |
1032 | ||
1033 | static int __init init_encrypted(void) | |
1034 | { | |
1035 | int ret; | |
1036 | ||
1037 | ret = encrypted_shash_alloc(); | |
1038 | if (ret < 0) | |
1039 | return ret; | |
b26bdde5 TI |
1040 | ret = aes_get_sizes(); |
1041 | if (ret < 0) | |
1042 | goto out; | |
7e70cb49 MZ |
1043 | ret = register_key_type(&key_type_encrypted); |
1044 | if (ret < 0) | |
1045 | goto out; | |
b26bdde5 | 1046 | return 0; |
7e70cb49 MZ |
1047 | out: |
1048 | encrypted_shash_release(); | |
1049 | return ret; | |
b9703449 | 1050 | |
7e70cb49 MZ |
1051 | } |
1052 | ||
1053 | static void __exit cleanup_encrypted(void) | |
1054 | { | |
1055 | encrypted_shash_release(); | |
1056 | unregister_key_type(&key_type_encrypted); | |
1057 | } | |
1058 | ||
1059 | late_initcall(init_encrypted); | |
1060 | module_exit(cleanup_encrypted); | |
1061 | ||
1062 | MODULE_LICENSE("GPL"); |