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b886d83c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d00a1c72 MZ |
2 | /* |
3 | * Copyright (C) 2010 IBM Corporation | |
4 | * | |
5 | * Author: | |
6 | * David Safford <safford@us.ibm.com> | |
7 | * | |
5395d312 | 8 | * See Documentation/security/keys/trusted-encrypted.rst |
d00a1c72 MZ |
9 | */ |
10 | ||
5ca4c20c | 11 | #include <crypto/hash_info.h> |
d00a1c72 MZ |
12 | #include <linux/uaccess.h> |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/parser.h> | |
17 | #include <linux/string.h> | |
93ae86e7 | 18 | #include <linux/err.h> |
d00a1c72 MZ |
19 | #include <keys/user-type.h> |
20 | #include <keys/trusted-type.h> | |
21 | #include <linux/key-type.h> | |
22 | #include <linux/rcupdate.h> | |
23 | #include <linux/crypto.h> | |
24 | #include <crypto/hash.h> | |
25 | #include <crypto/sha.h> | |
26 | #include <linux/capability.h> | |
27 | #include <linux/tpm.h> | |
28 | #include <linux/tpm_command.h> | |
29 | ||
22447981 | 30 | #include <keys/trusted.h> |
d00a1c72 MZ |
31 | |
32 | static const char hmac_alg[] = "hmac(sha1)"; | |
33 | static const char hash_alg[] = "sha1"; | |
24073043 | 34 | static struct tpm_chip *chip; |
0b6cf6b9 | 35 | static struct tpm_digest *digests; |
d00a1c72 MZ |
36 | |
37 | struct sdesc { | |
38 | struct shash_desc shash; | |
39 | char ctx[]; | |
40 | }; | |
41 | ||
42 | static struct crypto_shash *hashalg; | |
43 | static struct crypto_shash *hmacalg; | |
44 | ||
45 | static struct sdesc *init_sdesc(struct crypto_shash *alg) | |
46 | { | |
47 | struct sdesc *sdesc; | |
48 | int size; | |
49 | ||
50 | size = sizeof(struct shash_desc) + crypto_shash_descsize(alg); | |
51 | sdesc = kmalloc(size, GFP_KERNEL); | |
52 | if (!sdesc) | |
53 | return ERR_PTR(-ENOMEM); | |
54 | sdesc->shash.tfm = alg; | |
d00a1c72 MZ |
55 | return sdesc; |
56 | } | |
57 | ||
1bdbb402 | 58 | static int TSS_sha1(const unsigned char *data, unsigned int datalen, |
d00a1c72 MZ |
59 | unsigned char *digest) |
60 | { | |
61 | struct sdesc *sdesc; | |
62 | int ret; | |
63 | ||
64 | sdesc = init_sdesc(hashalg); | |
65 | if (IS_ERR(sdesc)) { | |
66 | pr_info("trusted_key: can't alloc %s\n", hash_alg); | |
67 | return PTR_ERR(sdesc); | |
68 | } | |
69 | ||
70 | ret = crypto_shash_digest(&sdesc->shash, data, datalen, digest); | |
ee618b46 | 71 | kzfree(sdesc); |
d00a1c72 MZ |
72 | return ret; |
73 | } | |
74 | ||
75 | static int TSS_rawhmac(unsigned char *digest, const unsigned char *key, | |
1bdbb402 | 76 | unsigned int keylen, ...) |
d00a1c72 MZ |
77 | { |
78 | struct sdesc *sdesc; | |
79 | va_list argp; | |
80 | unsigned int dlen; | |
81 | unsigned char *data; | |
82 | int ret; | |
83 | ||
84 | sdesc = init_sdesc(hmacalg); | |
85 | if (IS_ERR(sdesc)) { | |
86 | pr_info("trusted_key: can't alloc %s\n", hmac_alg); | |
87 | return PTR_ERR(sdesc); | |
88 | } | |
89 | ||
90 | ret = crypto_shash_setkey(hmacalg, key, keylen); | |
91 | if (ret < 0) | |
92 | goto out; | |
93 | ret = crypto_shash_init(&sdesc->shash); | |
94 | if (ret < 0) | |
95 | goto out; | |
96 | ||
97 | va_start(argp, keylen); | |
98 | for (;;) { | |
99 | dlen = va_arg(argp, unsigned int); | |
100 | if (dlen == 0) | |
101 | break; | |
102 | data = va_arg(argp, unsigned char *); | |
35576eab TH |
103 | if (data == NULL) { |
104 | ret = -EINVAL; | |
105 | break; | |
106 | } | |
d00a1c72 MZ |
107 | ret = crypto_shash_update(&sdesc->shash, data, dlen); |
108 | if (ret < 0) | |
35576eab | 109 | break; |
d00a1c72 MZ |
110 | } |
111 | va_end(argp); | |
bc5e0af0 MZ |
112 | if (!ret) |
113 | ret = crypto_shash_final(&sdesc->shash, digest); | |
d00a1c72 | 114 | out: |
ee618b46 | 115 | kzfree(sdesc); |
d00a1c72 MZ |
116 | return ret; |
117 | } | |
118 | ||
119 | /* | |
120 | * calculate authorization info fields to send to TPM | |
121 | */ | |
e1ea9f86 | 122 | int TSS_authhmac(unsigned char *digest, const unsigned char *key, |
1bdbb402 | 123 | unsigned int keylen, unsigned char *h1, |
be24b37e | 124 | unsigned char *h2, unsigned int h3, ...) |
d00a1c72 MZ |
125 | { |
126 | unsigned char paramdigest[SHA1_DIGEST_SIZE]; | |
127 | struct sdesc *sdesc; | |
128 | unsigned int dlen; | |
129 | unsigned char *data; | |
130 | unsigned char c; | |
131 | int ret; | |
132 | va_list argp; | |
133 | ||
c7871920 JS |
134 | if (!chip) |
135 | return -ENODEV; | |
136 | ||
d00a1c72 MZ |
137 | sdesc = init_sdesc(hashalg); |
138 | if (IS_ERR(sdesc)) { | |
139 | pr_info("trusted_key: can't alloc %s\n", hash_alg); | |
140 | return PTR_ERR(sdesc); | |
141 | } | |
142 | ||
be24b37e | 143 | c = !!h3; |
d00a1c72 MZ |
144 | ret = crypto_shash_init(&sdesc->shash); |
145 | if (ret < 0) | |
146 | goto out; | |
147 | va_start(argp, h3); | |
148 | for (;;) { | |
149 | dlen = va_arg(argp, unsigned int); | |
150 | if (dlen == 0) | |
151 | break; | |
152 | data = va_arg(argp, unsigned char *); | |
0e7491f6 TH |
153 | if (!data) { |
154 | ret = -EINVAL; | |
154a96bf | 155 | break; |
0e7491f6 | 156 | } |
d00a1c72 | 157 | ret = crypto_shash_update(&sdesc->shash, data, dlen); |
154a96bf TH |
158 | if (ret < 0) |
159 | break; | |
d00a1c72 MZ |
160 | } |
161 | va_end(argp); | |
154a96bf TH |
162 | if (!ret) |
163 | ret = crypto_shash_final(&sdesc->shash, paramdigest); | |
d00a1c72 | 164 | if (!ret) |
bc5e0af0 MZ |
165 | ret = TSS_rawhmac(digest, key, keylen, SHA1_DIGEST_SIZE, |
166 | paramdigest, TPM_NONCE_SIZE, h1, | |
167 | TPM_NONCE_SIZE, h2, 1, &c, 0, 0); | |
d00a1c72 | 168 | out: |
ee618b46 | 169 | kzfree(sdesc); |
d00a1c72 MZ |
170 | return ret; |
171 | } | |
e1ea9f86 | 172 | EXPORT_SYMBOL_GPL(TSS_authhmac); |
d00a1c72 MZ |
173 | |
174 | /* | |
175 | * verify the AUTH1_COMMAND (Seal) result from TPM | |
176 | */ | |
e1ea9f86 | 177 | int TSS_checkhmac1(unsigned char *buffer, |
bc5e0af0 MZ |
178 | const uint32_t command, |
179 | const unsigned char *ononce, | |
180 | const unsigned char *key, | |
1bdbb402 | 181 | unsigned int keylen, ...) |
d00a1c72 MZ |
182 | { |
183 | uint32_t bufsize; | |
184 | uint16_t tag; | |
185 | uint32_t ordinal; | |
186 | uint32_t result; | |
187 | unsigned char *enonce; | |
188 | unsigned char *continueflag; | |
189 | unsigned char *authdata; | |
190 | unsigned char testhmac[SHA1_DIGEST_SIZE]; | |
191 | unsigned char paramdigest[SHA1_DIGEST_SIZE]; | |
192 | struct sdesc *sdesc; | |
193 | unsigned int dlen; | |
194 | unsigned int dpos; | |
195 | va_list argp; | |
196 | int ret; | |
197 | ||
c7871920 JS |
198 | if (!chip) |
199 | return -ENODEV; | |
200 | ||
d00a1c72 MZ |
201 | bufsize = LOAD32(buffer, TPM_SIZE_OFFSET); |
202 | tag = LOAD16(buffer, 0); | |
203 | ordinal = command; | |
204 | result = LOAD32N(buffer, TPM_RETURN_OFFSET); | |
205 | if (tag == TPM_TAG_RSP_COMMAND) | |
206 | return 0; | |
207 | if (tag != TPM_TAG_RSP_AUTH1_COMMAND) | |
208 | return -EINVAL; | |
209 | authdata = buffer + bufsize - SHA1_DIGEST_SIZE; | |
210 | continueflag = authdata - 1; | |
211 | enonce = continueflag - TPM_NONCE_SIZE; | |
212 | ||
213 | sdesc = init_sdesc(hashalg); | |
214 | if (IS_ERR(sdesc)) { | |
215 | pr_info("trusted_key: can't alloc %s\n", hash_alg); | |
216 | return PTR_ERR(sdesc); | |
217 | } | |
218 | ret = crypto_shash_init(&sdesc->shash); | |
219 | if (ret < 0) | |
220 | goto out; | |
221 | ret = crypto_shash_update(&sdesc->shash, (const u8 *)&result, | |
222 | sizeof result); | |
223 | if (ret < 0) | |
224 | goto out; | |
225 | ret = crypto_shash_update(&sdesc->shash, (const u8 *)&ordinal, | |
226 | sizeof ordinal); | |
227 | if (ret < 0) | |
228 | goto out; | |
229 | va_start(argp, keylen); | |
230 | for (;;) { | |
231 | dlen = va_arg(argp, unsigned int); | |
232 | if (dlen == 0) | |
233 | break; | |
234 | dpos = va_arg(argp, unsigned int); | |
235 | ret = crypto_shash_update(&sdesc->shash, buffer + dpos, dlen); | |
154a96bf TH |
236 | if (ret < 0) |
237 | break; | |
d00a1c72 MZ |
238 | } |
239 | va_end(argp); | |
154a96bf TH |
240 | if (!ret) |
241 | ret = crypto_shash_final(&sdesc->shash, paramdigest); | |
d00a1c72 MZ |
242 | if (ret < 0) |
243 | goto out; | |
bc5e0af0 | 244 | |
d00a1c72 MZ |
245 | ret = TSS_rawhmac(testhmac, key, keylen, SHA1_DIGEST_SIZE, paramdigest, |
246 | TPM_NONCE_SIZE, enonce, TPM_NONCE_SIZE, ononce, | |
247 | 1, continueflag, 0, 0); | |
248 | if (ret < 0) | |
249 | goto out; | |
bc5e0af0 | 250 | |
d00a1c72 MZ |
251 | if (memcmp(testhmac, authdata, SHA1_DIGEST_SIZE)) |
252 | ret = -EINVAL; | |
253 | out: | |
ee618b46 | 254 | kzfree(sdesc); |
d00a1c72 MZ |
255 | return ret; |
256 | } | |
e1ea9f86 | 257 | EXPORT_SYMBOL_GPL(TSS_checkhmac1); |
d00a1c72 MZ |
258 | |
259 | /* | |
260 | * verify the AUTH2_COMMAND (unseal) result from TPM | |
261 | */ | |
bc5e0af0 MZ |
262 | static int TSS_checkhmac2(unsigned char *buffer, |
263 | const uint32_t command, | |
264 | const unsigned char *ononce, | |
265 | const unsigned char *key1, | |
1bdbb402 | 266 | unsigned int keylen1, |
bc5e0af0 | 267 | const unsigned char *key2, |
1bdbb402 | 268 | unsigned int keylen2, ...) |
d00a1c72 MZ |
269 | { |
270 | uint32_t bufsize; | |
271 | uint16_t tag; | |
272 | uint32_t ordinal; | |
273 | uint32_t result; | |
274 | unsigned char *enonce1; | |
275 | unsigned char *continueflag1; | |
276 | unsigned char *authdata1; | |
277 | unsigned char *enonce2; | |
278 | unsigned char *continueflag2; | |
279 | unsigned char *authdata2; | |
280 | unsigned char testhmac1[SHA1_DIGEST_SIZE]; | |
281 | unsigned char testhmac2[SHA1_DIGEST_SIZE]; | |
282 | unsigned char paramdigest[SHA1_DIGEST_SIZE]; | |
283 | struct sdesc *sdesc; | |
284 | unsigned int dlen; | |
285 | unsigned int dpos; | |
286 | va_list argp; | |
287 | int ret; | |
288 | ||
289 | bufsize = LOAD32(buffer, TPM_SIZE_OFFSET); | |
290 | tag = LOAD16(buffer, 0); | |
291 | ordinal = command; | |
292 | result = LOAD32N(buffer, TPM_RETURN_OFFSET); | |
293 | ||
294 | if (tag == TPM_TAG_RSP_COMMAND) | |
295 | return 0; | |
296 | if (tag != TPM_TAG_RSP_AUTH2_COMMAND) | |
297 | return -EINVAL; | |
298 | authdata1 = buffer + bufsize - (SHA1_DIGEST_SIZE + 1 | |
299 | + SHA1_DIGEST_SIZE + SHA1_DIGEST_SIZE); | |
300 | authdata2 = buffer + bufsize - (SHA1_DIGEST_SIZE); | |
301 | continueflag1 = authdata1 - 1; | |
302 | continueflag2 = authdata2 - 1; | |
303 | enonce1 = continueflag1 - TPM_NONCE_SIZE; | |
304 | enonce2 = continueflag2 - TPM_NONCE_SIZE; | |
305 | ||
306 | sdesc = init_sdesc(hashalg); | |
307 | if (IS_ERR(sdesc)) { | |
308 | pr_info("trusted_key: can't alloc %s\n", hash_alg); | |
309 | return PTR_ERR(sdesc); | |
310 | } | |
311 | ret = crypto_shash_init(&sdesc->shash); | |
312 | if (ret < 0) | |
313 | goto out; | |
314 | ret = crypto_shash_update(&sdesc->shash, (const u8 *)&result, | |
315 | sizeof result); | |
316 | if (ret < 0) | |
317 | goto out; | |
318 | ret = crypto_shash_update(&sdesc->shash, (const u8 *)&ordinal, | |
319 | sizeof ordinal); | |
320 | if (ret < 0) | |
321 | goto out; | |
322 | ||
323 | va_start(argp, keylen2); | |
324 | for (;;) { | |
325 | dlen = va_arg(argp, unsigned int); | |
326 | if (dlen == 0) | |
327 | break; | |
328 | dpos = va_arg(argp, unsigned int); | |
329 | ret = crypto_shash_update(&sdesc->shash, buffer + dpos, dlen); | |
154a96bf TH |
330 | if (ret < 0) |
331 | break; | |
d00a1c72 | 332 | } |
bc5e0af0 | 333 | va_end(argp); |
154a96bf TH |
334 | if (!ret) |
335 | ret = crypto_shash_final(&sdesc->shash, paramdigest); | |
d00a1c72 MZ |
336 | if (ret < 0) |
337 | goto out; | |
338 | ||
339 | ret = TSS_rawhmac(testhmac1, key1, keylen1, SHA1_DIGEST_SIZE, | |
340 | paramdigest, TPM_NONCE_SIZE, enonce1, | |
341 | TPM_NONCE_SIZE, ononce, 1, continueflag1, 0, 0); | |
bc5e0af0 MZ |
342 | if (ret < 0) |
343 | goto out; | |
d00a1c72 MZ |
344 | if (memcmp(testhmac1, authdata1, SHA1_DIGEST_SIZE)) { |
345 | ret = -EINVAL; | |
346 | goto out; | |
347 | } | |
348 | ret = TSS_rawhmac(testhmac2, key2, keylen2, SHA1_DIGEST_SIZE, | |
349 | paramdigest, TPM_NONCE_SIZE, enonce2, | |
350 | TPM_NONCE_SIZE, ononce, 1, continueflag2, 0, 0); | |
bc5e0af0 MZ |
351 | if (ret < 0) |
352 | goto out; | |
d00a1c72 MZ |
353 | if (memcmp(testhmac2, authdata2, SHA1_DIGEST_SIZE)) |
354 | ret = -EINVAL; | |
355 | out: | |
ee618b46 | 356 | kzfree(sdesc); |
d00a1c72 MZ |
357 | return ret; |
358 | } | |
359 | ||
360 | /* | |
361 | * For key specific tpm requests, we will generate and send our | |
362 | * own TPM command packets using the drivers send function. | |
363 | */ | |
e1ea9f86 | 364 | int trusted_tpm_send(unsigned char *cmd, size_t buflen) |
d00a1c72 MZ |
365 | { |
366 | int rc; | |
367 | ||
c7871920 JS |
368 | if (!chip) |
369 | return -ENODEV; | |
370 | ||
d00a1c72 | 371 | dump_tpm_buf(cmd); |
24073043 | 372 | rc = tpm_send(chip, cmd, buflen); |
d00a1c72 MZ |
373 | dump_tpm_buf(cmd); |
374 | if (rc > 0) | |
375 | /* Can't return positive return codes values to keyctl */ | |
376 | rc = -EPERM; | |
377 | return rc; | |
378 | } | |
e1ea9f86 | 379 | EXPORT_SYMBOL_GPL(trusted_tpm_send); |
d00a1c72 | 380 | |
d00a1c72 MZ |
381 | /* |
382 | * Lock a trusted key, by extending a selected PCR. | |
383 | * | |
384 | * Prevents a trusted key that is sealed to PCRs from being accessed. | |
385 | * This uses the tpm driver's extend function. | |
386 | */ | |
387 | static int pcrlock(const int pcrnum) | |
388 | { | |
d00a1c72 MZ |
389 | if (!capable(CAP_SYS_ADMIN)) |
390 | return -EPERM; | |
0b6cf6b9 RS |
391 | |
392 | return tpm_pcr_extend(chip, pcrnum, digests) ? -EINVAL : 0; | |
d00a1c72 MZ |
393 | } |
394 | ||
395 | /* | |
396 | * Create an object specific authorisation protocol (OSAP) session | |
397 | */ | |
398 | static int osap(struct tpm_buf *tb, struct osapsess *s, | |
1bdbb402 | 399 | const unsigned char *key, uint16_t type, uint32_t handle) |
d00a1c72 MZ |
400 | { |
401 | unsigned char enonce[TPM_NONCE_SIZE]; | |
402 | unsigned char ononce[TPM_NONCE_SIZE]; | |
403 | int ret; | |
404 | ||
24073043 | 405 | ret = tpm_get_random(chip, ononce, TPM_NONCE_SIZE); |
41ab999c | 406 | if (ret != TPM_NONCE_SIZE) |
d00a1c72 MZ |
407 | return ret; |
408 | ||
409 | INIT_BUF(tb); | |
410 | store16(tb, TPM_TAG_RQU_COMMAND); | |
411 | store32(tb, TPM_OSAP_SIZE); | |
412 | store32(tb, TPM_ORD_OSAP); | |
413 | store16(tb, type); | |
414 | store32(tb, handle); | |
415 | storebytes(tb, ononce, TPM_NONCE_SIZE); | |
416 | ||
aad887f6 | 417 | ret = trusted_tpm_send(tb->data, MAX_BUF_SIZE); |
d00a1c72 MZ |
418 | if (ret < 0) |
419 | return ret; | |
420 | ||
421 | s->handle = LOAD32(tb->data, TPM_DATA_OFFSET); | |
422 | memcpy(s->enonce, &(tb->data[TPM_DATA_OFFSET + sizeof(uint32_t)]), | |
423 | TPM_NONCE_SIZE); | |
424 | memcpy(enonce, &(tb->data[TPM_DATA_OFFSET + sizeof(uint32_t) + | |
425 | TPM_NONCE_SIZE]), TPM_NONCE_SIZE); | |
bc5e0af0 MZ |
426 | return TSS_rawhmac(s->secret, key, SHA1_DIGEST_SIZE, TPM_NONCE_SIZE, |
427 | enonce, TPM_NONCE_SIZE, ononce, 0, 0); | |
d00a1c72 MZ |
428 | } |
429 | ||
430 | /* | |
431 | * Create an object independent authorisation protocol (oiap) session | |
432 | */ | |
e1ea9f86 | 433 | int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce) |
d00a1c72 MZ |
434 | { |
435 | int ret; | |
436 | ||
c7871920 JS |
437 | if (!chip) |
438 | return -ENODEV; | |
439 | ||
d00a1c72 MZ |
440 | INIT_BUF(tb); |
441 | store16(tb, TPM_TAG_RQU_COMMAND); | |
442 | store32(tb, TPM_OIAP_SIZE); | |
443 | store32(tb, TPM_ORD_OIAP); | |
aad887f6 | 444 | ret = trusted_tpm_send(tb->data, MAX_BUF_SIZE); |
d00a1c72 MZ |
445 | if (ret < 0) |
446 | return ret; | |
447 | ||
448 | *handle = LOAD32(tb->data, TPM_DATA_OFFSET); | |
449 | memcpy(nonce, &tb->data[TPM_DATA_OFFSET + sizeof(uint32_t)], | |
450 | TPM_NONCE_SIZE); | |
bc5e0af0 | 451 | return 0; |
d00a1c72 | 452 | } |
e1ea9f86 | 453 | EXPORT_SYMBOL_GPL(oiap); |
d00a1c72 MZ |
454 | |
455 | struct tpm_digests { | |
456 | unsigned char encauth[SHA1_DIGEST_SIZE]; | |
457 | unsigned char pubauth[SHA1_DIGEST_SIZE]; | |
458 | unsigned char xorwork[SHA1_DIGEST_SIZE * 2]; | |
459 | unsigned char xorhash[SHA1_DIGEST_SIZE]; | |
460 | unsigned char nonceodd[TPM_NONCE_SIZE]; | |
461 | }; | |
462 | ||
463 | /* | |
464 | * Have the TPM seal(encrypt) the trusted key, possibly based on | |
465 | * Platform Configuration Registers (PCRs). AUTH1 for sealing key. | |
466 | */ | |
1bdbb402 MZ |
467 | static int tpm_seal(struct tpm_buf *tb, uint16_t keytype, |
468 | uint32_t keyhandle, const unsigned char *keyauth, | |
469 | const unsigned char *data, uint32_t datalen, | |
d00a1c72 MZ |
470 | unsigned char *blob, uint32_t *bloblen, |
471 | const unsigned char *blobauth, | |
1bdbb402 | 472 | const unsigned char *pcrinfo, uint32_t pcrinfosize) |
d00a1c72 MZ |
473 | { |
474 | struct osapsess sess; | |
475 | struct tpm_digests *td; | |
476 | unsigned char cont; | |
477 | uint32_t ordinal; | |
478 | uint32_t pcrsize; | |
479 | uint32_t datsize; | |
480 | int sealinfosize; | |
481 | int encdatasize; | |
482 | int storedsize; | |
483 | int ret; | |
484 | int i; | |
485 | ||
486 | /* alloc some work space for all the hashes */ | |
487 | td = kmalloc(sizeof *td, GFP_KERNEL); | |
488 | if (!td) | |
489 | return -ENOMEM; | |
490 | ||
491 | /* get session for sealing key */ | |
492 | ret = osap(tb, &sess, keyauth, keytype, keyhandle); | |
493 | if (ret < 0) | |
40c10017 | 494 | goto out; |
d00a1c72 MZ |
495 | dump_sess(&sess); |
496 | ||
497 | /* calculate encrypted authorization value */ | |
498 | memcpy(td->xorwork, sess.secret, SHA1_DIGEST_SIZE); | |
499 | memcpy(td->xorwork + SHA1_DIGEST_SIZE, sess.enonce, SHA1_DIGEST_SIZE); | |
500 | ret = TSS_sha1(td->xorwork, SHA1_DIGEST_SIZE * 2, td->xorhash); | |
501 | if (ret < 0) | |
40c10017 | 502 | goto out; |
d00a1c72 | 503 | |
24073043 | 504 | ret = tpm_get_random(chip, td->nonceodd, TPM_NONCE_SIZE); |
41ab999c | 505 | if (ret != TPM_NONCE_SIZE) |
40c10017 | 506 | goto out; |
d00a1c72 MZ |
507 | ordinal = htonl(TPM_ORD_SEAL); |
508 | datsize = htonl(datalen); | |
509 | pcrsize = htonl(pcrinfosize); | |
510 | cont = 0; | |
511 | ||
512 | /* encrypt data authorization key */ | |
513 | for (i = 0; i < SHA1_DIGEST_SIZE; ++i) | |
514 | td->encauth[i] = td->xorhash[i] ^ blobauth[i]; | |
515 | ||
516 | /* calculate authorization HMAC value */ | |
517 | if (pcrinfosize == 0) { | |
518 | /* no pcr info specified */ | |
bc5e0af0 MZ |
519 | ret = TSS_authhmac(td->pubauth, sess.secret, SHA1_DIGEST_SIZE, |
520 | sess.enonce, td->nonceodd, cont, | |
521 | sizeof(uint32_t), &ordinal, SHA1_DIGEST_SIZE, | |
522 | td->encauth, sizeof(uint32_t), &pcrsize, | |
523 | sizeof(uint32_t), &datsize, datalen, data, 0, | |
524 | 0); | |
d00a1c72 MZ |
525 | } else { |
526 | /* pcr info specified */ | |
bc5e0af0 MZ |
527 | ret = TSS_authhmac(td->pubauth, sess.secret, SHA1_DIGEST_SIZE, |
528 | sess.enonce, td->nonceodd, cont, | |
529 | sizeof(uint32_t), &ordinal, SHA1_DIGEST_SIZE, | |
530 | td->encauth, sizeof(uint32_t), &pcrsize, | |
531 | pcrinfosize, pcrinfo, sizeof(uint32_t), | |
532 | &datsize, datalen, data, 0, 0); | |
d00a1c72 | 533 | } |
bc5e0af0 | 534 | if (ret < 0) |
40c10017 | 535 | goto out; |
d00a1c72 MZ |
536 | |
537 | /* build and send the TPM request packet */ | |
538 | INIT_BUF(tb); | |
539 | store16(tb, TPM_TAG_RQU_AUTH1_COMMAND); | |
540 | store32(tb, TPM_SEAL_SIZE + pcrinfosize + datalen); | |
541 | store32(tb, TPM_ORD_SEAL); | |
542 | store32(tb, keyhandle); | |
543 | storebytes(tb, td->encauth, SHA1_DIGEST_SIZE); | |
544 | store32(tb, pcrinfosize); | |
545 | storebytes(tb, pcrinfo, pcrinfosize); | |
546 | store32(tb, datalen); | |
547 | storebytes(tb, data, datalen); | |
548 | store32(tb, sess.handle); | |
549 | storebytes(tb, td->nonceodd, TPM_NONCE_SIZE); | |
550 | store8(tb, cont); | |
551 | storebytes(tb, td->pubauth, SHA1_DIGEST_SIZE); | |
552 | ||
aad887f6 | 553 | ret = trusted_tpm_send(tb->data, MAX_BUF_SIZE); |
d00a1c72 | 554 | if (ret < 0) |
40c10017 | 555 | goto out; |
d00a1c72 MZ |
556 | |
557 | /* calculate the size of the returned Blob */ | |
558 | sealinfosize = LOAD32(tb->data, TPM_DATA_OFFSET + sizeof(uint32_t)); | |
559 | encdatasize = LOAD32(tb->data, TPM_DATA_OFFSET + sizeof(uint32_t) + | |
560 | sizeof(uint32_t) + sealinfosize); | |
561 | storedsize = sizeof(uint32_t) + sizeof(uint32_t) + sealinfosize + | |
562 | sizeof(uint32_t) + encdatasize; | |
563 | ||
564 | /* check the HMAC in the response */ | |
565 | ret = TSS_checkhmac1(tb->data, ordinal, td->nonceodd, sess.secret, | |
566 | SHA1_DIGEST_SIZE, storedsize, TPM_DATA_OFFSET, 0, | |
567 | 0); | |
568 | ||
569 | /* copy the returned blob to caller */ | |
bc5e0af0 MZ |
570 | if (!ret) { |
571 | memcpy(blob, tb->data + TPM_DATA_OFFSET, storedsize); | |
572 | *bloblen = storedsize; | |
573 | } | |
40c10017 | 574 | out: |
ee618b46 | 575 | kzfree(td); |
d00a1c72 MZ |
576 | return ret; |
577 | } | |
578 | ||
579 | /* | |
580 | * use the AUTH2_COMMAND form of unseal, to authorize both key and blob | |
581 | */ | |
582 | static int tpm_unseal(struct tpm_buf *tb, | |
1bdbb402 MZ |
583 | uint32_t keyhandle, const unsigned char *keyauth, |
584 | const unsigned char *blob, int bloblen, | |
d00a1c72 MZ |
585 | const unsigned char *blobauth, |
586 | unsigned char *data, unsigned int *datalen) | |
587 | { | |
588 | unsigned char nonceodd[TPM_NONCE_SIZE]; | |
589 | unsigned char enonce1[TPM_NONCE_SIZE]; | |
590 | unsigned char enonce2[TPM_NONCE_SIZE]; | |
591 | unsigned char authdata1[SHA1_DIGEST_SIZE]; | |
592 | unsigned char authdata2[SHA1_DIGEST_SIZE]; | |
593 | uint32_t authhandle1 = 0; | |
594 | uint32_t authhandle2 = 0; | |
595 | unsigned char cont = 0; | |
596 | uint32_t ordinal; | |
597 | uint32_t keyhndl; | |
598 | int ret; | |
599 | ||
600 | /* sessions for unsealing key and data */ | |
601 | ret = oiap(tb, &authhandle1, enonce1); | |
602 | if (ret < 0) { | |
603 | pr_info("trusted_key: oiap failed (%d)\n", ret); | |
604 | return ret; | |
605 | } | |
606 | ret = oiap(tb, &authhandle2, enonce2); | |
607 | if (ret < 0) { | |
608 | pr_info("trusted_key: oiap failed (%d)\n", ret); | |
609 | return ret; | |
610 | } | |
611 | ||
612 | ordinal = htonl(TPM_ORD_UNSEAL); | |
613 | keyhndl = htonl(SRKHANDLE); | |
24073043 | 614 | ret = tpm_get_random(chip, nonceodd, TPM_NONCE_SIZE); |
41ab999c | 615 | if (ret != TPM_NONCE_SIZE) { |
d00a1c72 MZ |
616 | pr_info("trusted_key: tpm_get_random failed (%d)\n", ret); |
617 | return ret; | |
618 | } | |
bc5e0af0 MZ |
619 | ret = TSS_authhmac(authdata1, keyauth, TPM_NONCE_SIZE, |
620 | enonce1, nonceodd, cont, sizeof(uint32_t), | |
621 | &ordinal, bloblen, blob, 0, 0); | |
622 | if (ret < 0) | |
623 | return ret; | |
624 | ret = TSS_authhmac(authdata2, blobauth, TPM_NONCE_SIZE, | |
625 | enonce2, nonceodd, cont, sizeof(uint32_t), | |
626 | &ordinal, bloblen, blob, 0, 0); | |
627 | if (ret < 0) | |
628 | return ret; | |
d00a1c72 MZ |
629 | |
630 | /* build and send TPM request packet */ | |
631 | INIT_BUF(tb); | |
632 | store16(tb, TPM_TAG_RQU_AUTH2_COMMAND); | |
633 | store32(tb, TPM_UNSEAL_SIZE + bloblen); | |
634 | store32(tb, TPM_ORD_UNSEAL); | |
635 | store32(tb, keyhandle); | |
636 | storebytes(tb, blob, bloblen); | |
637 | store32(tb, authhandle1); | |
638 | storebytes(tb, nonceodd, TPM_NONCE_SIZE); | |
639 | store8(tb, cont); | |
640 | storebytes(tb, authdata1, SHA1_DIGEST_SIZE); | |
641 | store32(tb, authhandle2); | |
642 | storebytes(tb, nonceodd, TPM_NONCE_SIZE); | |
643 | store8(tb, cont); | |
644 | storebytes(tb, authdata2, SHA1_DIGEST_SIZE); | |
645 | ||
aad887f6 | 646 | ret = trusted_tpm_send(tb->data, MAX_BUF_SIZE); |
d00a1c72 MZ |
647 | if (ret < 0) { |
648 | pr_info("trusted_key: authhmac failed (%d)\n", ret); | |
649 | return ret; | |
650 | } | |
651 | ||
652 | *datalen = LOAD32(tb->data, TPM_DATA_OFFSET); | |
653 | ret = TSS_checkhmac2(tb->data, ordinal, nonceodd, | |
654 | keyauth, SHA1_DIGEST_SIZE, | |
655 | blobauth, SHA1_DIGEST_SIZE, | |
656 | sizeof(uint32_t), TPM_DATA_OFFSET, | |
657 | *datalen, TPM_DATA_OFFSET + sizeof(uint32_t), 0, | |
658 | 0); | |
bc5e0af0 | 659 | if (ret < 0) { |
d00a1c72 | 660 | pr_info("trusted_key: TSS_checkhmac2 failed (%d)\n", ret); |
bc5e0af0 MZ |
661 | return ret; |
662 | } | |
d00a1c72 | 663 | memcpy(data, tb->data + TPM_DATA_OFFSET + sizeof(uint32_t), *datalen); |
bc5e0af0 | 664 | return 0; |
d00a1c72 MZ |
665 | } |
666 | ||
667 | /* | |
668 | * Have the TPM seal(encrypt) the symmetric key | |
669 | */ | |
670 | static int key_seal(struct trusted_key_payload *p, | |
671 | struct trusted_key_options *o) | |
672 | { | |
673 | struct tpm_buf *tb; | |
674 | int ret; | |
675 | ||
676 | tb = kzalloc(sizeof *tb, GFP_KERNEL); | |
677 | if (!tb) | |
678 | return -ENOMEM; | |
679 | ||
680 | /* include migratable flag at end of sealed key */ | |
681 | p->key[p->key_len] = p->migratable; | |
682 | ||
683 | ret = tpm_seal(tb, o->keytype, o->keyhandle, o->keyauth, | |
684 | p->key, p->key_len + 1, p->blob, &p->blob_len, | |
685 | o->blobauth, o->pcrinfo, o->pcrinfo_len); | |
686 | if (ret < 0) | |
687 | pr_info("trusted_key: srkseal failed (%d)\n", ret); | |
688 | ||
ee618b46 | 689 | kzfree(tb); |
d00a1c72 MZ |
690 | return ret; |
691 | } | |
692 | ||
693 | /* | |
694 | * Have the TPM unseal(decrypt) the symmetric key | |
695 | */ | |
696 | static int key_unseal(struct trusted_key_payload *p, | |
697 | struct trusted_key_options *o) | |
698 | { | |
699 | struct tpm_buf *tb; | |
700 | int ret; | |
701 | ||
702 | tb = kzalloc(sizeof *tb, GFP_KERNEL); | |
703 | if (!tb) | |
704 | return -ENOMEM; | |
705 | ||
706 | ret = tpm_unseal(tb, o->keyhandle, o->keyauth, p->blob, p->blob_len, | |
707 | o->blobauth, p->key, &p->key_len); | |
d00a1c72 MZ |
708 | if (ret < 0) |
709 | pr_info("trusted_key: srkunseal failed (%d)\n", ret); | |
bc5e0af0 MZ |
710 | else |
711 | /* pull migratable flag out of sealed key */ | |
712 | p->migratable = p->key[--p->key_len]; | |
d00a1c72 | 713 | |
ee618b46 | 714 | kzfree(tb); |
d00a1c72 MZ |
715 | return ret; |
716 | } | |
717 | ||
718 | enum { | |
94c13f66 | 719 | Opt_err, |
d00a1c72 MZ |
720 | Opt_new, Opt_load, Opt_update, |
721 | Opt_keyhandle, Opt_keyauth, Opt_blobauth, | |
5ca4c20c JS |
722 | Opt_pcrinfo, Opt_pcrlock, Opt_migratable, |
723 | Opt_hash, | |
5beb0c43 JS |
724 | Opt_policydigest, |
725 | Opt_policyhandle, | |
d00a1c72 MZ |
726 | }; |
727 | ||
728 | static const match_table_t key_tokens = { | |
729 | {Opt_new, "new"}, | |
730 | {Opt_load, "load"}, | |
731 | {Opt_update, "update"}, | |
732 | {Opt_keyhandle, "keyhandle=%s"}, | |
733 | {Opt_keyauth, "keyauth=%s"}, | |
734 | {Opt_blobauth, "blobauth=%s"}, | |
735 | {Opt_pcrinfo, "pcrinfo=%s"}, | |
736 | {Opt_pcrlock, "pcrlock=%s"}, | |
737 | {Opt_migratable, "migratable=%s"}, | |
5ca4c20c | 738 | {Opt_hash, "hash=%s"}, |
5beb0c43 JS |
739 | {Opt_policydigest, "policydigest=%s"}, |
740 | {Opt_policyhandle, "policyhandle=%s"}, | |
d00a1c72 MZ |
741 | {Opt_err, NULL} |
742 | }; | |
743 | ||
744 | /* can have zero or more token= options */ | |
745 | static int getoptions(char *c, struct trusted_key_payload *pay, | |
746 | struct trusted_key_options *opt) | |
747 | { | |
748 | substring_t args[MAX_OPT_ARGS]; | |
749 | char *p = c; | |
750 | int token; | |
751 | int res; | |
752 | unsigned long handle; | |
753 | unsigned long lock; | |
5208cc83 | 754 | unsigned long token_mask = 0; |
f3c82ade | 755 | unsigned int digest_len; |
5ca4c20c JS |
756 | int i; |
757 | int tpm2; | |
758 | ||
24073043 | 759 | tpm2 = tpm_is_tpm2(chip); |
5ca4c20c JS |
760 | if (tpm2 < 0) |
761 | return tpm2; | |
762 | ||
763 | opt->hash = tpm2 ? HASH_ALGO_SHA256 : HASH_ALGO_SHA1; | |
d00a1c72 MZ |
764 | |
765 | while ((p = strsep(&c, " \t"))) { | |
766 | if (*p == '\0' || *p == ' ' || *p == '\t') | |
767 | continue; | |
768 | token = match_token(p, key_tokens, args); | |
5208cc83 JS |
769 | if (test_and_set_bit(token, &token_mask)) |
770 | return -EINVAL; | |
d00a1c72 MZ |
771 | |
772 | switch (token) { | |
773 | case Opt_pcrinfo: | |
774 | opt->pcrinfo_len = strlen(args[0].from) / 2; | |
775 | if (opt->pcrinfo_len > MAX_PCRINFO_SIZE) | |
776 | return -EINVAL; | |
2684bf7f MZ |
777 | res = hex2bin(opt->pcrinfo, args[0].from, |
778 | opt->pcrinfo_len); | |
779 | if (res < 0) | |
780 | return -EINVAL; | |
d00a1c72 MZ |
781 | break; |
782 | case Opt_keyhandle: | |
29707b20 | 783 | res = kstrtoul(args[0].from, 16, &handle); |
d00a1c72 MZ |
784 | if (res < 0) |
785 | return -EINVAL; | |
786 | opt->keytype = SEAL_keytype; | |
787 | opt->keyhandle = handle; | |
788 | break; | |
789 | case Opt_keyauth: | |
790 | if (strlen(args[0].from) != 2 * SHA1_DIGEST_SIZE) | |
791 | return -EINVAL; | |
2684bf7f MZ |
792 | res = hex2bin(opt->keyauth, args[0].from, |
793 | SHA1_DIGEST_SIZE); | |
794 | if (res < 0) | |
795 | return -EINVAL; | |
d00a1c72 MZ |
796 | break; |
797 | case Opt_blobauth: | |
798 | if (strlen(args[0].from) != 2 * SHA1_DIGEST_SIZE) | |
799 | return -EINVAL; | |
2684bf7f MZ |
800 | res = hex2bin(opt->blobauth, args[0].from, |
801 | SHA1_DIGEST_SIZE); | |
802 | if (res < 0) | |
803 | return -EINVAL; | |
d00a1c72 MZ |
804 | break; |
805 | case Opt_migratable: | |
806 | if (*args[0].from == '0') | |
807 | pay->migratable = 0; | |
808 | else | |
809 | return -EINVAL; | |
810 | break; | |
811 | case Opt_pcrlock: | |
29707b20 | 812 | res = kstrtoul(args[0].from, 10, &lock); |
d00a1c72 MZ |
813 | if (res < 0) |
814 | return -EINVAL; | |
815 | opt->pcrlock = lock; | |
816 | break; | |
5ca4c20c | 817 | case Opt_hash: |
5beb0c43 JS |
818 | if (test_bit(Opt_policydigest, &token_mask)) |
819 | return -EINVAL; | |
5ca4c20c JS |
820 | for (i = 0; i < HASH_ALGO__LAST; i++) { |
821 | if (!strcmp(args[0].from, hash_algo_name[i])) { | |
822 | opt->hash = i; | |
823 | break; | |
824 | } | |
825 | } | |
826 | if (i == HASH_ALGO__LAST) | |
827 | return -EINVAL; | |
828 | if (!tpm2 && i != HASH_ALGO_SHA1) { | |
829 | pr_info("trusted_key: TPM 1.x only supports SHA-1.\n"); | |
830 | return -EINVAL; | |
831 | } | |
832 | break; | |
5beb0c43 | 833 | case Opt_policydigest: |
f3c82ade JS |
834 | digest_len = hash_digest_size[opt->hash]; |
835 | if (!tpm2 || strlen(args[0].from) != (2 * digest_len)) | |
5beb0c43 JS |
836 | return -EINVAL; |
837 | res = hex2bin(opt->policydigest, args[0].from, | |
f3c82ade | 838 | digest_len); |
5beb0c43 JS |
839 | if (res < 0) |
840 | return -EINVAL; | |
f3c82ade | 841 | opt->policydigest_len = digest_len; |
5beb0c43 JS |
842 | break; |
843 | case Opt_policyhandle: | |
844 | if (!tpm2) | |
845 | return -EINVAL; | |
846 | res = kstrtoul(args[0].from, 16, &handle); | |
847 | if (res < 0) | |
848 | return -EINVAL; | |
849 | opt->policyhandle = handle; | |
850 | break; | |
d00a1c72 MZ |
851 | default: |
852 | return -EINVAL; | |
853 | } | |
854 | } | |
855 | return 0; | |
856 | } | |
857 | ||
858 | /* | |
859 | * datablob_parse - parse the keyctl data and fill in the | |
860 | * payload and options structures | |
861 | * | |
862 | * On success returns 0, otherwise -EINVAL. | |
863 | */ | |
864 | static int datablob_parse(char *datablob, struct trusted_key_payload *p, | |
865 | struct trusted_key_options *o) | |
866 | { | |
867 | substring_t args[MAX_OPT_ARGS]; | |
868 | long keylen; | |
869 | int ret = -EINVAL; | |
870 | int key_cmd; | |
871 | char *c; | |
872 | ||
873 | /* main command */ | |
874 | c = strsep(&datablob, " \t"); | |
875 | if (!c) | |
876 | return -EINVAL; | |
877 | key_cmd = match_token(c, key_tokens, args); | |
878 | switch (key_cmd) { | |
879 | case Opt_new: | |
880 | /* first argument is key size */ | |
881 | c = strsep(&datablob, " \t"); | |
882 | if (!c) | |
883 | return -EINVAL; | |
29707b20 | 884 | ret = kstrtol(c, 10, &keylen); |
d00a1c72 MZ |
885 | if (ret < 0 || keylen < MIN_KEY_SIZE || keylen > MAX_KEY_SIZE) |
886 | return -EINVAL; | |
887 | p->key_len = keylen; | |
888 | ret = getoptions(datablob, p, o); | |
889 | if (ret < 0) | |
890 | return ret; | |
891 | ret = Opt_new; | |
892 | break; | |
893 | case Opt_load: | |
894 | /* first argument is sealed blob */ | |
895 | c = strsep(&datablob, " \t"); | |
896 | if (!c) | |
897 | return -EINVAL; | |
898 | p->blob_len = strlen(c) / 2; | |
899 | if (p->blob_len > MAX_BLOB_SIZE) | |
900 | return -EINVAL; | |
2684bf7f MZ |
901 | ret = hex2bin(p->blob, c, p->blob_len); |
902 | if (ret < 0) | |
903 | return -EINVAL; | |
d00a1c72 MZ |
904 | ret = getoptions(datablob, p, o); |
905 | if (ret < 0) | |
906 | return ret; | |
907 | ret = Opt_load; | |
908 | break; | |
909 | case Opt_update: | |
910 | /* all arguments are options */ | |
911 | ret = getoptions(datablob, p, o); | |
912 | if (ret < 0) | |
913 | return ret; | |
914 | ret = Opt_update; | |
915 | break; | |
916 | case Opt_err: | |
917 | return -EINVAL; | |
918 | break; | |
919 | } | |
920 | return ret; | |
921 | } | |
922 | ||
923 | static struct trusted_key_options *trusted_options_alloc(void) | |
924 | { | |
925 | struct trusted_key_options *options; | |
0fe54803 JS |
926 | int tpm2; |
927 | ||
24073043 | 928 | tpm2 = tpm_is_tpm2(chip); |
0fe54803 JS |
929 | if (tpm2 < 0) |
930 | return NULL; | |
d00a1c72 MZ |
931 | |
932 | options = kzalloc(sizeof *options, GFP_KERNEL); | |
bc5e0af0 MZ |
933 | if (options) { |
934 | /* set any non-zero defaults */ | |
935 | options->keytype = SRK_keytype; | |
0fe54803 JS |
936 | |
937 | if (!tpm2) | |
938 | options->keyhandle = SRKHANDLE; | |
bc5e0af0 | 939 | } |
d00a1c72 MZ |
940 | return options; |
941 | } | |
942 | ||
943 | static struct trusted_key_payload *trusted_payload_alloc(struct key *key) | |
944 | { | |
945 | struct trusted_key_payload *p = NULL; | |
946 | int ret; | |
947 | ||
948 | ret = key_payload_reserve(key, sizeof *p); | |
949 | if (ret < 0) | |
950 | return p; | |
951 | p = kzalloc(sizeof *p, GFP_KERNEL); | |
bc5e0af0 MZ |
952 | if (p) |
953 | p->migratable = 1; /* migratable by default */ | |
d00a1c72 MZ |
954 | return p; |
955 | } | |
956 | ||
957 | /* | |
958 | * trusted_instantiate - create a new trusted key | |
959 | * | |
960 | * Unseal an existing trusted blob or, for a new key, get a | |
961 | * random key, then seal and create a trusted key-type key, | |
962 | * adding it to the specified keyring. | |
963 | * | |
964 | * On success, return 0. Otherwise return errno. | |
965 | */ | |
cf7f601c DH |
966 | static int trusted_instantiate(struct key *key, |
967 | struct key_preparsed_payload *prep) | |
d00a1c72 MZ |
968 | { |
969 | struct trusted_key_payload *payload = NULL; | |
970 | struct trusted_key_options *options = NULL; | |
cf7f601c | 971 | size_t datalen = prep->datalen; |
d00a1c72 MZ |
972 | char *datablob; |
973 | int ret = 0; | |
974 | int key_cmd; | |
41ab999c | 975 | size_t key_len; |
0fe54803 JS |
976 | int tpm2; |
977 | ||
24073043 | 978 | tpm2 = tpm_is_tpm2(chip); |
0fe54803 JS |
979 | if (tpm2 < 0) |
980 | return tpm2; | |
d00a1c72 | 981 | |
cf7f601c | 982 | if (datalen <= 0 || datalen > 32767 || !prep->data) |
d00a1c72 MZ |
983 | return -EINVAL; |
984 | ||
985 | datablob = kmalloc(datalen + 1, GFP_KERNEL); | |
986 | if (!datablob) | |
987 | return -ENOMEM; | |
cf7f601c | 988 | memcpy(datablob, prep->data, datalen); |
d00a1c72 MZ |
989 | datablob[datalen] = '\0'; |
990 | ||
991 | options = trusted_options_alloc(); | |
992 | if (!options) { | |
993 | ret = -ENOMEM; | |
994 | goto out; | |
995 | } | |
996 | payload = trusted_payload_alloc(key); | |
997 | if (!payload) { | |
998 | ret = -ENOMEM; | |
999 | goto out; | |
1000 | } | |
1001 | ||
1002 | key_cmd = datablob_parse(datablob, payload, options); | |
1003 | if (key_cmd < 0) { | |
1004 | ret = key_cmd; | |
1005 | goto out; | |
1006 | } | |
1007 | ||
0fe54803 JS |
1008 | if (!options->keyhandle) { |
1009 | ret = -EINVAL; | |
1010 | goto out; | |
1011 | } | |
1012 | ||
d00a1c72 MZ |
1013 | dump_payload(payload); |
1014 | dump_options(options); | |
1015 | ||
1016 | switch (key_cmd) { | |
1017 | case Opt_load: | |
0fe54803 | 1018 | if (tpm2) |
24073043 | 1019 | ret = tpm_unseal_trusted(chip, payload, options); |
0fe54803 JS |
1020 | else |
1021 | ret = key_unseal(payload, options); | |
d00a1c72 MZ |
1022 | dump_payload(payload); |
1023 | dump_options(options); | |
1024 | if (ret < 0) | |
1025 | pr_info("trusted_key: key_unseal failed (%d)\n", ret); | |
1026 | break; | |
1027 | case Opt_new: | |
41ab999c | 1028 | key_len = payload->key_len; |
24073043 | 1029 | ret = tpm_get_random(chip, payload->key, key_len); |
41ab999c | 1030 | if (ret != key_len) { |
d00a1c72 MZ |
1031 | pr_info("trusted_key: key_create failed (%d)\n", ret); |
1032 | goto out; | |
1033 | } | |
0fe54803 | 1034 | if (tpm2) |
24073043 | 1035 | ret = tpm_seal_trusted(chip, payload, options); |
0fe54803 JS |
1036 | else |
1037 | ret = key_seal(payload, options); | |
d00a1c72 MZ |
1038 | if (ret < 0) |
1039 | pr_info("trusted_key: key_seal failed (%d)\n", ret); | |
1040 | break; | |
1041 | default: | |
1042 | ret = -EINVAL; | |
1043 | goto out; | |
1044 | } | |
1045 | if (!ret && options->pcrlock) | |
1046 | ret = pcrlock(options->pcrlock); | |
1047 | out: | |
ee618b46 EB |
1048 | kzfree(datablob); |
1049 | kzfree(options); | |
d00a1c72 | 1050 | if (!ret) |
ee0b31a2 | 1051 | rcu_assign_keypointer(key, payload); |
d00a1c72 | 1052 | else |
ee618b46 | 1053 | kzfree(payload); |
d00a1c72 MZ |
1054 | return ret; |
1055 | } | |
1056 | ||
1057 | static void trusted_rcu_free(struct rcu_head *rcu) | |
1058 | { | |
1059 | struct trusted_key_payload *p; | |
1060 | ||
1061 | p = container_of(rcu, struct trusted_key_payload, rcu); | |
ee618b46 | 1062 | kzfree(p); |
d00a1c72 MZ |
1063 | } |
1064 | ||
1065 | /* | |
1066 | * trusted_update - reseal an existing key with new PCR values | |
1067 | */ | |
cf7f601c | 1068 | static int trusted_update(struct key *key, struct key_preparsed_payload *prep) |
d00a1c72 | 1069 | { |
096fe9ea | 1070 | struct trusted_key_payload *p; |
d00a1c72 MZ |
1071 | struct trusted_key_payload *new_p; |
1072 | struct trusted_key_options *new_o; | |
cf7f601c | 1073 | size_t datalen = prep->datalen; |
d00a1c72 MZ |
1074 | char *datablob; |
1075 | int ret = 0; | |
1076 | ||
363b02da | 1077 | if (key_is_negative(key)) |
096fe9ea DH |
1078 | return -ENOKEY; |
1079 | p = key->payload.data[0]; | |
d00a1c72 MZ |
1080 | if (!p->migratable) |
1081 | return -EPERM; | |
cf7f601c | 1082 | if (datalen <= 0 || datalen > 32767 || !prep->data) |
d00a1c72 MZ |
1083 | return -EINVAL; |
1084 | ||
1085 | datablob = kmalloc(datalen + 1, GFP_KERNEL); | |
1086 | if (!datablob) | |
1087 | return -ENOMEM; | |
1088 | new_o = trusted_options_alloc(); | |
1089 | if (!new_o) { | |
1090 | ret = -ENOMEM; | |
1091 | goto out; | |
1092 | } | |
1093 | new_p = trusted_payload_alloc(key); | |
1094 | if (!new_p) { | |
1095 | ret = -ENOMEM; | |
1096 | goto out; | |
1097 | } | |
1098 | ||
cf7f601c | 1099 | memcpy(datablob, prep->data, datalen); |
d00a1c72 MZ |
1100 | datablob[datalen] = '\0'; |
1101 | ret = datablob_parse(datablob, new_p, new_o); | |
1102 | if (ret != Opt_update) { | |
1103 | ret = -EINVAL; | |
ee618b46 | 1104 | kzfree(new_p); |
d00a1c72 MZ |
1105 | goto out; |
1106 | } | |
0fe54803 JS |
1107 | |
1108 | if (!new_o->keyhandle) { | |
1109 | ret = -EINVAL; | |
ee618b46 | 1110 | kzfree(new_p); |
0fe54803 JS |
1111 | goto out; |
1112 | } | |
1113 | ||
d00a1c72 MZ |
1114 | /* copy old key values, and reseal with new pcrs */ |
1115 | new_p->migratable = p->migratable; | |
1116 | new_p->key_len = p->key_len; | |
1117 | memcpy(new_p->key, p->key, p->key_len); | |
1118 | dump_payload(p); | |
1119 | dump_payload(new_p); | |
1120 | ||
1121 | ret = key_seal(new_p, new_o); | |
1122 | if (ret < 0) { | |
1123 | pr_info("trusted_key: key_seal failed (%d)\n", ret); | |
ee618b46 | 1124 | kzfree(new_p); |
d00a1c72 MZ |
1125 | goto out; |
1126 | } | |
1127 | if (new_o->pcrlock) { | |
1128 | ret = pcrlock(new_o->pcrlock); | |
1129 | if (ret < 0) { | |
1130 | pr_info("trusted_key: pcrlock failed (%d)\n", ret); | |
ee618b46 | 1131 | kzfree(new_p); |
d00a1c72 MZ |
1132 | goto out; |
1133 | } | |
1134 | } | |
ee0b31a2 | 1135 | rcu_assign_keypointer(key, new_p); |
d00a1c72 MZ |
1136 | call_rcu(&p->rcu, trusted_rcu_free); |
1137 | out: | |
ee618b46 EB |
1138 | kzfree(datablob); |
1139 | kzfree(new_o); | |
d00a1c72 MZ |
1140 | return ret; |
1141 | } | |
1142 | ||
1143 | /* | |
1144 | * trusted_read - copy the sealed blob data to userspace in hex. | |
1145 | * On success, return to userspace the trusted key datablob size. | |
1146 | */ | |
1147 | static long trusted_read(const struct key *key, char __user *buffer, | |
1148 | size_t buflen) | |
1149 | { | |
0837e49a | 1150 | const struct trusted_key_payload *p; |
d00a1c72 MZ |
1151 | char *ascii_buf; |
1152 | char *bufp; | |
1153 | int i; | |
1154 | ||
0837e49a | 1155 | p = dereference_key_locked(key); |
d00a1c72 MZ |
1156 | if (!p) |
1157 | return -EINVAL; | |
d00a1c72 | 1158 | |
a3c812f7 | 1159 | if (buffer && buflen >= 2 * p->blob_len) { |
6da2ec56 | 1160 | ascii_buf = kmalloc_array(2, p->blob_len, GFP_KERNEL); |
a3c812f7 EB |
1161 | if (!ascii_buf) |
1162 | return -ENOMEM; | |
1163 | ||
1164 | bufp = ascii_buf; | |
1165 | for (i = 0; i < p->blob_len; i++) | |
1166 | bufp = hex_byte_pack(bufp, p->blob[i]); | |
1167 | if (copy_to_user(buffer, ascii_buf, 2 * p->blob_len) != 0) { | |
1168 | kzfree(ascii_buf); | |
1169 | return -EFAULT; | |
1170 | } | |
ee618b46 | 1171 | kzfree(ascii_buf); |
d00a1c72 | 1172 | } |
d00a1c72 MZ |
1173 | return 2 * p->blob_len; |
1174 | } | |
1175 | ||
1176 | /* | |
ee618b46 | 1177 | * trusted_destroy - clear and free the key's payload |
d00a1c72 MZ |
1178 | */ |
1179 | static void trusted_destroy(struct key *key) | |
1180 | { | |
ee618b46 | 1181 | kzfree(key->payload.data[0]); |
d00a1c72 MZ |
1182 | } |
1183 | ||
1184 | struct key_type key_type_trusted = { | |
1185 | .name = "trusted", | |
1186 | .instantiate = trusted_instantiate, | |
1187 | .update = trusted_update, | |
d00a1c72 MZ |
1188 | .destroy = trusted_destroy, |
1189 | .describe = user_describe, | |
1190 | .read = trusted_read, | |
1191 | }; | |
1192 | ||
1193 | EXPORT_SYMBOL_GPL(key_type_trusted); | |
1194 | ||
1195 | static void trusted_shash_release(void) | |
1196 | { | |
1197 | if (hashalg) | |
1198 | crypto_free_shash(hashalg); | |
1199 | if (hmacalg) | |
1200 | crypto_free_shash(hmacalg); | |
1201 | } | |
1202 | ||
1203 | static int __init trusted_shash_alloc(void) | |
1204 | { | |
1205 | int ret; | |
1206 | ||
3d234b33 | 1207 | hmacalg = crypto_alloc_shash(hmac_alg, 0, 0); |
d00a1c72 MZ |
1208 | if (IS_ERR(hmacalg)) { |
1209 | pr_info("trusted_key: could not allocate crypto %s\n", | |
1210 | hmac_alg); | |
1211 | return PTR_ERR(hmacalg); | |
1212 | } | |
1213 | ||
3d234b33 | 1214 | hashalg = crypto_alloc_shash(hash_alg, 0, 0); |
d00a1c72 MZ |
1215 | if (IS_ERR(hashalg)) { |
1216 | pr_info("trusted_key: could not allocate crypto %s\n", | |
1217 | hash_alg); | |
1218 | ret = PTR_ERR(hashalg); | |
1219 | goto hashalg_fail; | |
1220 | } | |
1221 | ||
1222 | return 0; | |
1223 | ||
1224 | hashalg_fail: | |
1225 | crypto_free_shash(hmacalg); | |
1226 | return ret; | |
1227 | } | |
1228 | ||
0b6cf6b9 RS |
1229 | static int __init init_digests(void) |
1230 | { | |
1231 | u8 digest[TPM_MAX_DIGEST_SIZE]; | |
1232 | int ret; | |
1233 | int i; | |
1234 | ||
1235 | ret = tpm_get_random(chip, digest, TPM_MAX_DIGEST_SIZE); | |
1236 | if (ret < 0) | |
1237 | return ret; | |
1238 | if (ret < TPM_MAX_DIGEST_SIZE) | |
1239 | return -EFAULT; | |
1240 | ||
1241 | digests = kcalloc(chip->nr_allocated_banks, sizeof(*digests), | |
1242 | GFP_KERNEL); | |
1243 | if (!digests) | |
1244 | return -ENOMEM; | |
1245 | ||
1246 | for (i = 0; i < chip->nr_allocated_banks; i++) | |
1247 | memcpy(digests[i].digest, digest, TPM_MAX_DIGEST_SIZE); | |
1248 | ||
1249 | return 0; | |
1250 | } | |
1251 | ||
d00a1c72 MZ |
1252 | static int __init init_trusted(void) |
1253 | { | |
1254 | int ret; | |
1255 | ||
c7871920 JS |
1256 | /* encrypted_keys.ko depends on successful load of this module even if |
1257 | * TPM is not used. | |
1258 | */ | |
24073043 RS |
1259 | chip = tpm_default_chip(); |
1260 | if (!chip) | |
c7871920 JS |
1261 | return 0; |
1262 | ||
0b6cf6b9 | 1263 | ret = init_digests(); |
d00a1c72 | 1264 | if (ret < 0) |
24073043 | 1265 | goto err_put; |
0b6cf6b9 RS |
1266 | ret = trusted_shash_alloc(); |
1267 | if (ret < 0) | |
1268 | goto err_free; | |
d00a1c72 MZ |
1269 | ret = register_key_type(&key_type_trusted); |
1270 | if (ret < 0) | |
24073043 RS |
1271 | goto err_release; |
1272 | return 0; | |
1273 | err_release: | |
1274 | trusted_shash_release(); | |
0b6cf6b9 RS |
1275 | err_free: |
1276 | kfree(digests); | |
24073043 RS |
1277 | err_put: |
1278 | put_device(&chip->dev); | |
d00a1c72 MZ |
1279 | return ret; |
1280 | } | |
1281 | ||
1282 | static void __exit cleanup_trusted(void) | |
1283 | { | |
c7871920 JS |
1284 | if (chip) { |
1285 | put_device(&chip->dev); | |
1286 | kfree(digests); | |
1287 | trusted_shash_release(); | |
1288 | unregister_key_type(&key_type_trusted); | |
1289 | } | |
d00a1c72 MZ |
1290 | } |
1291 | ||
1292 | late_initcall(init_trusted); | |
1293 | module_exit(cleanup_trusted); | |
1294 | ||
1295 | MODULE_LICENSE("GPL"); |