Commit | Line | Data |
---|---|---|
b886d83c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d00a1c72 MZ |
2 | /* |
3 | * Copyright (C) 2010 IBM Corporation | |
5d0682be | 4 | * Copyright (c) 2019-2021, Linaro Limited |
d00a1c72 | 5 | * |
5395d312 | 6 | * See Documentation/security/keys/trusted-encrypted.rst |
d00a1c72 MZ |
7 | */ |
8 | ||
5ca4c20c | 9 | #include <crypto/hash_info.h> |
d00a1c72 MZ |
10 | #include <linux/init.h> |
11 | #include <linux/slab.h> | |
12 | #include <linux/parser.h> | |
13 | #include <linux/string.h> | |
93ae86e7 | 14 | #include <linux/err.h> |
d00a1c72 MZ |
15 | #include <keys/trusted-type.h> |
16 | #include <linux/key-type.h> | |
d00a1c72 MZ |
17 | #include <linux/crypto.h> |
18 | #include <crypto/hash.h> | |
a24d22b2 | 19 | #include <crypto/sha1.h> |
d00a1c72 MZ |
20 | #include <linux/tpm.h> |
21 | #include <linux/tpm_command.h> | |
22 | ||
47f9c279 | 23 | #include <keys/trusted_tpm.h> |
d00a1c72 MZ |
24 | |
25 | static const char hmac_alg[] = "hmac(sha1)"; | |
26 | static const char hash_alg[] = "sha1"; | |
24073043 | 27 | static struct tpm_chip *chip; |
0b6cf6b9 | 28 | static struct tpm_digest *digests; |
d00a1c72 MZ |
29 | |
30 | struct sdesc { | |
31 | struct shash_desc shash; | |
32 | char ctx[]; | |
33 | }; | |
34 | ||
35 | static struct crypto_shash *hashalg; | |
36 | static struct crypto_shash *hmacalg; | |
37 | ||
38 | static struct sdesc *init_sdesc(struct crypto_shash *alg) | |
39 | { | |
40 | struct sdesc *sdesc; | |
41 | int size; | |
42 | ||
43 | size = sizeof(struct shash_desc) + crypto_shash_descsize(alg); | |
44 | sdesc = kmalloc(size, GFP_KERNEL); | |
45 | if (!sdesc) | |
46 | return ERR_PTR(-ENOMEM); | |
47 | sdesc->shash.tfm = alg; | |
d00a1c72 MZ |
48 | return sdesc; |
49 | } | |
50 | ||
1bdbb402 | 51 | static int TSS_sha1(const unsigned char *data, unsigned int datalen, |
d00a1c72 MZ |
52 | unsigned char *digest) |
53 | { | |
54 | struct sdesc *sdesc; | |
55 | int ret; | |
56 | ||
57 | sdesc = init_sdesc(hashalg); | |
58 | if (IS_ERR(sdesc)) { | |
5d0682be | 59 | pr_info("can't alloc %s\n", hash_alg); |
d00a1c72 MZ |
60 | return PTR_ERR(sdesc); |
61 | } | |
62 | ||
63 | ret = crypto_shash_digest(&sdesc->shash, data, datalen, digest); | |
453431a5 | 64 | kfree_sensitive(sdesc); |
d00a1c72 MZ |
65 | return ret; |
66 | } | |
67 | ||
68 | static int TSS_rawhmac(unsigned char *digest, const unsigned char *key, | |
1bdbb402 | 69 | unsigned int keylen, ...) |
d00a1c72 MZ |
70 | { |
71 | struct sdesc *sdesc; | |
72 | va_list argp; | |
73 | unsigned int dlen; | |
74 | unsigned char *data; | |
75 | int ret; | |
76 | ||
77 | sdesc = init_sdesc(hmacalg); | |
78 | if (IS_ERR(sdesc)) { | |
5d0682be | 79 | pr_info("can't alloc %s\n", hmac_alg); |
d00a1c72 MZ |
80 | return PTR_ERR(sdesc); |
81 | } | |
82 | ||
83 | ret = crypto_shash_setkey(hmacalg, key, keylen); | |
84 | if (ret < 0) | |
85 | goto out; | |
86 | ret = crypto_shash_init(&sdesc->shash); | |
87 | if (ret < 0) | |
88 | goto out; | |
89 | ||
90 | va_start(argp, keylen); | |
91 | for (;;) { | |
92 | dlen = va_arg(argp, unsigned int); | |
93 | if (dlen == 0) | |
94 | break; | |
95 | data = va_arg(argp, unsigned char *); | |
35576eab TH |
96 | if (data == NULL) { |
97 | ret = -EINVAL; | |
98 | break; | |
99 | } | |
d00a1c72 MZ |
100 | ret = crypto_shash_update(&sdesc->shash, data, dlen); |
101 | if (ret < 0) | |
35576eab | 102 | break; |
d00a1c72 MZ |
103 | } |
104 | va_end(argp); | |
bc5e0af0 MZ |
105 | if (!ret) |
106 | ret = crypto_shash_final(&sdesc->shash, digest); | |
d00a1c72 | 107 | out: |
453431a5 | 108 | kfree_sensitive(sdesc); |
d00a1c72 MZ |
109 | return ret; |
110 | } | |
111 | ||
112 | /* | |
113 | * calculate authorization info fields to send to TPM | |
114 | */ | |
e1ea9f86 | 115 | int TSS_authhmac(unsigned char *digest, const unsigned char *key, |
1bdbb402 | 116 | unsigned int keylen, unsigned char *h1, |
be24b37e | 117 | unsigned char *h2, unsigned int h3, ...) |
d00a1c72 MZ |
118 | { |
119 | unsigned char paramdigest[SHA1_DIGEST_SIZE]; | |
120 | struct sdesc *sdesc; | |
121 | unsigned int dlen; | |
122 | unsigned char *data; | |
123 | unsigned char c; | |
124 | int ret; | |
125 | va_list argp; | |
126 | ||
c7871920 JS |
127 | if (!chip) |
128 | return -ENODEV; | |
129 | ||
d00a1c72 MZ |
130 | sdesc = init_sdesc(hashalg); |
131 | if (IS_ERR(sdesc)) { | |
5d0682be | 132 | pr_info("can't alloc %s\n", hash_alg); |
d00a1c72 MZ |
133 | return PTR_ERR(sdesc); |
134 | } | |
135 | ||
be24b37e | 136 | c = !!h3; |
d00a1c72 MZ |
137 | ret = crypto_shash_init(&sdesc->shash); |
138 | if (ret < 0) | |
139 | goto out; | |
140 | va_start(argp, h3); | |
141 | for (;;) { | |
142 | dlen = va_arg(argp, unsigned int); | |
143 | if (dlen == 0) | |
144 | break; | |
145 | data = va_arg(argp, unsigned char *); | |
0e7491f6 TH |
146 | if (!data) { |
147 | ret = -EINVAL; | |
154a96bf | 148 | break; |
0e7491f6 | 149 | } |
d00a1c72 | 150 | ret = crypto_shash_update(&sdesc->shash, data, dlen); |
154a96bf TH |
151 | if (ret < 0) |
152 | break; | |
d00a1c72 MZ |
153 | } |
154 | va_end(argp); | |
154a96bf TH |
155 | if (!ret) |
156 | ret = crypto_shash_final(&sdesc->shash, paramdigest); | |
d00a1c72 | 157 | if (!ret) |
bc5e0af0 MZ |
158 | ret = TSS_rawhmac(digest, key, keylen, SHA1_DIGEST_SIZE, |
159 | paramdigest, TPM_NONCE_SIZE, h1, | |
160 | TPM_NONCE_SIZE, h2, 1, &c, 0, 0); | |
d00a1c72 | 161 | out: |
453431a5 | 162 | kfree_sensitive(sdesc); |
d00a1c72 MZ |
163 | return ret; |
164 | } | |
e1ea9f86 | 165 | EXPORT_SYMBOL_GPL(TSS_authhmac); |
d00a1c72 MZ |
166 | |
167 | /* | |
168 | * verify the AUTH1_COMMAND (Seal) result from TPM | |
169 | */ | |
e1ea9f86 | 170 | int TSS_checkhmac1(unsigned char *buffer, |
bc5e0af0 MZ |
171 | const uint32_t command, |
172 | const unsigned char *ononce, | |
173 | const unsigned char *key, | |
1bdbb402 | 174 | unsigned int keylen, ...) |
d00a1c72 MZ |
175 | { |
176 | uint32_t bufsize; | |
177 | uint16_t tag; | |
178 | uint32_t ordinal; | |
179 | uint32_t result; | |
180 | unsigned char *enonce; | |
181 | unsigned char *continueflag; | |
182 | unsigned char *authdata; | |
183 | unsigned char testhmac[SHA1_DIGEST_SIZE]; | |
184 | unsigned char paramdigest[SHA1_DIGEST_SIZE]; | |
185 | struct sdesc *sdesc; | |
186 | unsigned int dlen; | |
187 | unsigned int dpos; | |
188 | va_list argp; | |
189 | int ret; | |
190 | ||
c7871920 JS |
191 | if (!chip) |
192 | return -ENODEV; | |
193 | ||
d00a1c72 MZ |
194 | bufsize = LOAD32(buffer, TPM_SIZE_OFFSET); |
195 | tag = LOAD16(buffer, 0); | |
196 | ordinal = command; | |
197 | result = LOAD32N(buffer, TPM_RETURN_OFFSET); | |
198 | if (tag == TPM_TAG_RSP_COMMAND) | |
199 | return 0; | |
200 | if (tag != TPM_TAG_RSP_AUTH1_COMMAND) | |
201 | return -EINVAL; | |
202 | authdata = buffer + bufsize - SHA1_DIGEST_SIZE; | |
203 | continueflag = authdata - 1; | |
204 | enonce = continueflag - TPM_NONCE_SIZE; | |
205 | ||
206 | sdesc = init_sdesc(hashalg); | |
207 | if (IS_ERR(sdesc)) { | |
5d0682be | 208 | pr_info("can't alloc %s\n", hash_alg); |
d00a1c72 MZ |
209 | return PTR_ERR(sdesc); |
210 | } | |
211 | ret = crypto_shash_init(&sdesc->shash); | |
212 | if (ret < 0) | |
213 | goto out; | |
214 | ret = crypto_shash_update(&sdesc->shash, (const u8 *)&result, | |
215 | sizeof result); | |
216 | if (ret < 0) | |
217 | goto out; | |
218 | ret = crypto_shash_update(&sdesc->shash, (const u8 *)&ordinal, | |
219 | sizeof ordinal); | |
220 | if (ret < 0) | |
221 | goto out; | |
222 | va_start(argp, keylen); | |
223 | for (;;) { | |
224 | dlen = va_arg(argp, unsigned int); | |
225 | if (dlen == 0) | |
226 | break; | |
227 | dpos = va_arg(argp, unsigned int); | |
228 | ret = crypto_shash_update(&sdesc->shash, buffer + dpos, dlen); | |
154a96bf TH |
229 | if (ret < 0) |
230 | break; | |
d00a1c72 MZ |
231 | } |
232 | va_end(argp); | |
154a96bf TH |
233 | if (!ret) |
234 | ret = crypto_shash_final(&sdesc->shash, paramdigest); | |
d00a1c72 MZ |
235 | if (ret < 0) |
236 | goto out; | |
bc5e0af0 | 237 | |
d00a1c72 MZ |
238 | ret = TSS_rawhmac(testhmac, key, keylen, SHA1_DIGEST_SIZE, paramdigest, |
239 | TPM_NONCE_SIZE, enonce, TPM_NONCE_SIZE, ononce, | |
240 | 1, continueflag, 0, 0); | |
241 | if (ret < 0) | |
242 | goto out; | |
bc5e0af0 | 243 | |
d00a1c72 MZ |
244 | if (memcmp(testhmac, authdata, SHA1_DIGEST_SIZE)) |
245 | ret = -EINVAL; | |
246 | out: | |
453431a5 | 247 | kfree_sensitive(sdesc); |
d00a1c72 MZ |
248 | return ret; |
249 | } | |
e1ea9f86 | 250 | EXPORT_SYMBOL_GPL(TSS_checkhmac1); |
d00a1c72 MZ |
251 | |
252 | /* | |
253 | * verify the AUTH2_COMMAND (unseal) result from TPM | |
254 | */ | |
bc5e0af0 MZ |
255 | static int TSS_checkhmac2(unsigned char *buffer, |
256 | const uint32_t command, | |
257 | const unsigned char *ononce, | |
258 | const unsigned char *key1, | |
1bdbb402 | 259 | unsigned int keylen1, |
bc5e0af0 | 260 | const unsigned char *key2, |
1bdbb402 | 261 | unsigned int keylen2, ...) |
d00a1c72 MZ |
262 | { |
263 | uint32_t bufsize; | |
264 | uint16_t tag; | |
265 | uint32_t ordinal; | |
266 | uint32_t result; | |
267 | unsigned char *enonce1; | |
268 | unsigned char *continueflag1; | |
269 | unsigned char *authdata1; | |
270 | unsigned char *enonce2; | |
271 | unsigned char *continueflag2; | |
272 | unsigned char *authdata2; | |
273 | unsigned char testhmac1[SHA1_DIGEST_SIZE]; | |
274 | unsigned char testhmac2[SHA1_DIGEST_SIZE]; | |
275 | unsigned char paramdigest[SHA1_DIGEST_SIZE]; | |
276 | struct sdesc *sdesc; | |
277 | unsigned int dlen; | |
278 | unsigned int dpos; | |
279 | va_list argp; | |
280 | int ret; | |
281 | ||
282 | bufsize = LOAD32(buffer, TPM_SIZE_OFFSET); | |
283 | tag = LOAD16(buffer, 0); | |
284 | ordinal = command; | |
285 | result = LOAD32N(buffer, TPM_RETURN_OFFSET); | |
286 | ||
287 | if (tag == TPM_TAG_RSP_COMMAND) | |
288 | return 0; | |
289 | if (tag != TPM_TAG_RSP_AUTH2_COMMAND) | |
290 | return -EINVAL; | |
291 | authdata1 = buffer + bufsize - (SHA1_DIGEST_SIZE + 1 | |
292 | + SHA1_DIGEST_SIZE + SHA1_DIGEST_SIZE); | |
293 | authdata2 = buffer + bufsize - (SHA1_DIGEST_SIZE); | |
294 | continueflag1 = authdata1 - 1; | |
295 | continueflag2 = authdata2 - 1; | |
296 | enonce1 = continueflag1 - TPM_NONCE_SIZE; | |
297 | enonce2 = continueflag2 - TPM_NONCE_SIZE; | |
298 | ||
299 | sdesc = init_sdesc(hashalg); | |
300 | if (IS_ERR(sdesc)) { | |
5d0682be | 301 | pr_info("can't alloc %s\n", hash_alg); |
d00a1c72 MZ |
302 | return PTR_ERR(sdesc); |
303 | } | |
304 | ret = crypto_shash_init(&sdesc->shash); | |
305 | if (ret < 0) | |
306 | goto out; | |
307 | ret = crypto_shash_update(&sdesc->shash, (const u8 *)&result, | |
308 | sizeof result); | |
309 | if (ret < 0) | |
310 | goto out; | |
311 | ret = crypto_shash_update(&sdesc->shash, (const u8 *)&ordinal, | |
312 | sizeof ordinal); | |
313 | if (ret < 0) | |
314 | goto out; | |
315 | ||
316 | va_start(argp, keylen2); | |
317 | for (;;) { | |
318 | dlen = va_arg(argp, unsigned int); | |
319 | if (dlen == 0) | |
320 | break; | |
321 | dpos = va_arg(argp, unsigned int); | |
322 | ret = crypto_shash_update(&sdesc->shash, buffer + dpos, dlen); | |
154a96bf TH |
323 | if (ret < 0) |
324 | break; | |
d00a1c72 | 325 | } |
bc5e0af0 | 326 | va_end(argp); |
154a96bf TH |
327 | if (!ret) |
328 | ret = crypto_shash_final(&sdesc->shash, paramdigest); | |
d00a1c72 MZ |
329 | if (ret < 0) |
330 | goto out; | |
331 | ||
332 | ret = TSS_rawhmac(testhmac1, key1, keylen1, SHA1_DIGEST_SIZE, | |
333 | paramdigest, TPM_NONCE_SIZE, enonce1, | |
334 | TPM_NONCE_SIZE, ononce, 1, continueflag1, 0, 0); | |
bc5e0af0 MZ |
335 | if (ret < 0) |
336 | goto out; | |
d00a1c72 MZ |
337 | if (memcmp(testhmac1, authdata1, SHA1_DIGEST_SIZE)) { |
338 | ret = -EINVAL; | |
339 | goto out; | |
340 | } | |
341 | ret = TSS_rawhmac(testhmac2, key2, keylen2, SHA1_DIGEST_SIZE, | |
342 | paramdigest, TPM_NONCE_SIZE, enonce2, | |
343 | TPM_NONCE_SIZE, ononce, 1, continueflag2, 0, 0); | |
bc5e0af0 MZ |
344 | if (ret < 0) |
345 | goto out; | |
d00a1c72 MZ |
346 | if (memcmp(testhmac2, authdata2, SHA1_DIGEST_SIZE)) |
347 | ret = -EINVAL; | |
348 | out: | |
453431a5 | 349 | kfree_sensitive(sdesc); |
d00a1c72 MZ |
350 | return ret; |
351 | } | |
352 | ||
353 | /* | |
354 | * For key specific tpm requests, we will generate and send our | |
355 | * own TPM command packets using the drivers send function. | |
356 | */ | |
e1ea9f86 | 357 | int trusted_tpm_send(unsigned char *cmd, size_t buflen) |
d00a1c72 | 358 | { |
4f0feb54 | 359 | struct tpm_buf buf; |
d00a1c72 MZ |
360 | int rc; |
361 | ||
c7871920 JS |
362 | if (!chip) |
363 | return -ENODEV; | |
364 | ||
4f0feb54 JS |
365 | rc = tpm_try_get_ops(chip); |
366 | if (rc) | |
367 | return rc; | |
368 | ||
369 | buf.flags = 0; | |
e1b72e1b | 370 | buf.length = buflen; |
4f0feb54 | 371 | buf.data = cmd; |
d00a1c72 | 372 | dump_tpm_buf(cmd); |
4f0feb54 | 373 | rc = tpm_transmit_cmd(chip, &buf, 4, "sending data"); |
d00a1c72 | 374 | dump_tpm_buf(cmd); |
4f0feb54 | 375 | |
d00a1c72 | 376 | if (rc > 0) |
4f0feb54 | 377 | /* TPM error */ |
d00a1c72 | 378 | rc = -EPERM; |
4f0feb54 JS |
379 | |
380 | tpm_put_ops(chip); | |
d00a1c72 MZ |
381 | return rc; |
382 | } | |
e1ea9f86 | 383 | EXPORT_SYMBOL_GPL(trusted_tpm_send); |
d00a1c72 | 384 | |
d00a1c72 MZ |
385 | /* |
386 | * Lock a trusted key, by extending a selected PCR. | |
387 | * | |
388 | * Prevents a trusted key that is sealed to PCRs from being accessed. | |
389 | * This uses the tpm driver's extend function. | |
390 | */ | |
391 | static int pcrlock(const int pcrnum) | |
392 | { | |
d00a1c72 MZ |
393 | if (!capable(CAP_SYS_ADMIN)) |
394 | return -EPERM; | |
0b6cf6b9 RS |
395 | |
396 | return tpm_pcr_extend(chip, pcrnum, digests) ? -EINVAL : 0; | |
d00a1c72 MZ |
397 | } |
398 | ||
399 | /* | |
400 | * Create an object specific authorisation protocol (OSAP) session | |
401 | */ | |
c6f61e59 | 402 | static int osap(struct tpm_buf *tb, struct osapsess *s, |
1bdbb402 | 403 | const unsigned char *key, uint16_t type, uint32_t handle) |
d00a1c72 MZ |
404 | { |
405 | unsigned char enonce[TPM_NONCE_SIZE]; | |
406 | unsigned char ononce[TPM_NONCE_SIZE]; | |
407 | int ret; | |
408 | ||
24073043 | 409 | ret = tpm_get_random(chip, ononce, TPM_NONCE_SIZE); |
5df16caa | 410 | if (ret < 0) |
d00a1c72 MZ |
411 | return ret; |
412 | ||
5df16caa JS |
413 | if (ret != TPM_NONCE_SIZE) |
414 | return -EIO; | |
415 | ||
c6f61e59 SG |
416 | tpm_buf_reset(tb, TPM_TAG_RQU_COMMAND, TPM_ORD_OSAP); |
417 | tpm_buf_append_u16(tb, type); | |
418 | tpm_buf_append_u32(tb, handle); | |
419 | tpm_buf_append(tb, ononce, TPM_NONCE_SIZE); | |
d00a1c72 | 420 | |
e1b72e1b | 421 | ret = trusted_tpm_send(tb->data, tb->length); |
d00a1c72 MZ |
422 | if (ret < 0) |
423 | return ret; | |
424 | ||
425 | s->handle = LOAD32(tb->data, TPM_DATA_OFFSET); | |
426 | memcpy(s->enonce, &(tb->data[TPM_DATA_OFFSET + sizeof(uint32_t)]), | |
427 | TPM_NONCE_SIZE); | |
428 | memcpy(enonce, &(tb->data[TPM_DATA_OFFSET + sizeof(uint32_t) + | |
429 | TPM_NONCE_SIZE]), TPM_NONCE_SIZE); | |
bc5e0af0 MZ |
430 | return TSS_rawhmac(s->secret, key, SHA1_DIGEST_SIZE, TPM_NONCE_SIZE, |
431 | enonce, TPM_NONCE_SIZE, ononce, 0, 0); | |
d00a1c72 MZ |
432 | } |
433 | ||
434 | /* | |
435 | * Create an object independent authorisation protocol (oiap) session | |
436 | */ | |
c6f61e59 | 437 | int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce) |
d00a1c72 MZ |
438 | { |
439 | int ret; | |
440 | ||
c7871920 JS |
441 | if (!chip) |
442 | return -ENODEV; | |
443 | ||
c6f61e59 | 444 | tpm_buf_reset(tb, TPM_TAG_RQU_COMMAND, TPM_ORD_OIAP); |
e1b72e1b | 445 | ret = trusted_tpm_send(tb->data, tb->length); |
d00a1c72 MZ |
446 | if (ret < 0) |
447 | return ret; | |
448 | ||
449 | *handle = LOAD32(tb->data, TPM_DATA_OFFSET); | |
450 | memcpy(nonce, &tb->data[TPM_DATA_OFFSET + sizeof(uint32_t)], | |
451 | TPM_NONCE_SIZE); | |
bc5e0af0 | 452 | return 0; |
d00a1c72 | 453 | } |
e1ea9f86 | 454 | EXPORT_SYMBOL_GPL(oiap); |
d00a1c72 MZ |
455 | |
456 | struct tpm_digests { | |
457 | unsigned char encauth[SHA1_DIGEST_SIZE]; | |
458 | unsigned char pubauth[SHA1_DIGEST_SIZE]; | |
459 | unsigned char xorwork[SHA1_DIGEST_SIZE * 2]; | |
460 | unsigned char xorhash[SHA1_DIGEST_SIZE]; | |
461 | unsigned char nonceodd[TPM_NONCE_SIZE]; | |
462 | }; | |
463 | ||
464 | /* | |
465 | * Have the TPM seal(encrypt) the trusted key, possibly based on | |
466 | * Platform Configuration Registers (PCRs). AUTH1 for sealing key. | |
467 | */ | |
c6f61e59 | 468 | static int tpm_seal(struct tpm_buf *tb, uint16_t keytype, |
1bdbb402 MZ |
469 | uint32_t keyhandle, const unsigned char *keyauth, |
470 | const unsigned char *data, uint32_t datalen, | |
d00a1c72 MZ |
471 | unsigned char *blob, uint32_t *bloblen, |
472 | const unsigned char *blobauth, | |
1bdbb402 | 473 | const unsigned char *pcrinfo, uint32_t pcrinfosize) |
d00a1c72 MZ |
474 | { |
475 | struct osapsess sess; | |
476 | struct tpm_digests *td; | |
477 | unsigned char cont; | |
478 | uint32_t ordinal; | |
479 | uint32_t pcrsize; | |
480 | uint32_t datsize; | |
481 | int sealinfosize; | |
482 | int encdatasize; | |
483 | int storedsize; | |
484 | int ret; | |
485 | int i; | |
486 | ||
487 | /* alloc some work space for all the hashes */ | |
488 | td = kmalloc(sizeof *td, GFP_KERNEL); | |
489 | if (!td) | |
490 | return -ENOMEM; | |
491 | ||
492 | /* get session for sealing key */ | |
493 | ret = osap(tb, &sess, keyauth, keytype, keyhandle); | |
494 | if (ret < 0) | |
40c10017 | 495 | goto out; |
d00a1c72 MZ |
496 | dump_sess(&sess); |
497 | ||
498 | /* calculate encrypted authorization value */ | |
499 | memcpy(td->xorwork, sess.secret, SHA1_DIGEST_SIZE); | |
500 | memcpy(td->xorwork + SHA1_DIGEST_SIZE, sess.enonce, SHA1_DIGEST_SIZE); | |
501 | ret = TSS_sha1(td->xorwork, SHA1_DIGEST_SIZE * 2, td->xorhash); | |
502 | if (ret < 0) | |
40c10017 | 503 | goto out; |
d00a1c72 | 504 | |
24073043 | 505 | ret = tpm_get_random(chip, td->nonceodd, TPM_NONCE_SIZE); |
5df16caa | 506 | if (ret < 0) |
83a775d5 | 507 | goto out; |
5df16caa | 508 | |
83a775d5 CIK |
509 | if (ret != TPM_NONCE_SIZE) { |
510 | ret = -EIO; | |
511 | goto out; | |
512 | } | |
5df16caa | 513 | |
d00a1c72 MZ |
514 | ordinal = htonl(TPM_ORD_SEAL); |
515 | datsize = htonl(datalen); | |
516 | pcrsize = htonl(pcrinfosize); | |
517 | cont = 0; | |
518 | ||
519 | /* encrypt data authorization key */ | |
520 | for (i = 0; i < SHA1_DIGEST_SIZE; ++i) | |
521 | td->encauth[i] = td->xorhash[i] ^ blobauth[i]; | |
522 | ||
523 | /* calculate authorization HMAC value */ | |
524 | if (pcrinfosize == 0) { | |
525 | /* no pcr info specified */ | |
bc5e0af0 MZ |
526 | ret = TSS_authhmac(td->pubauth, sess.secret, SHA1_DIGEST_SIZE, |
527 | sess.enonce, td->nonceodd, cont, | |
528 | sizeof(uint32_t), &ordinal, SHA1_DIGEST_SIZE, | |
529 | td->encauth, sizeof(uint32_t), &pcrsize, | |
530 | sizeof(uint32_t), &datsize, datalen, data, 0, | |
531 | 0); | |
d00a1c72 MZ |
532 | } else { |
533 | /* pcr info specified */ | |
bc5e0af0 MZ |
534 | ret = TSS_authhmac(td->pubauth, sess.secret, SHA1_DIGEST_SIZE, |
535 | sess.enonce, td->nonceodd, cont, | |
536 | sizeof(uint32_t), &ordinal, SHA1_DIGEST_SIZE, | |
537 | td->encauth, sizeof(uint32_t), &pcrsize, | |
538 | pcrinfosize, pcrinfo, sizeof(uint32_t), | |
539 | &datsize, datalen, data, 0, 0); | |
d00a1c72 | 540 | } |
bc5e0af0 | 541 | if (ret < 0) |
40c10017 | 542 | goto out; |
d00a1c72 MZ |
543 | |
544 | /* build and send the TPM request packet */ | |
c6f61e59 SG |
545 | tpm_buf_reset(tb, TPM_TAG_RQU_AUTH1_COMMAND, TPM_ORD_SEAL); |
546 | tpm_buf_append_u32(tb, keyhandle); | |
547 | tpm_buf_append(tb, td->encauth, SHA1_DIGEST_SIZE); | |
548 | tpm_buf_append_u32(tb, pcrinfosize); | |
549 | tpm_buf_append(tb, pcrinfo, pcrinfosize); | |
550 | tpm_buf_append_u32(tb, datalen); | |
551 | tpm_buf_append(tb, data, datalen); | |
552 | tpm_buf_append_u32(tb, sess.handle); | |
553 | tpm_buf_append(tb, td->nonceodd, TPM_NONCE_SIZE); | |
554 | tpm_buf_append_u8(tb, cont); | |
555 | tpm_buf_append(tb, td->pubauth, SHA1_DIGEST_SIZE); | |
d00a1c72 | 556 | |
e1b72e1b | 557 | ret = trusted_tpm_send(tb->data, tb->length); |
d00a1c72 | 558 | if (ret < 0) |
40c10017 | 559 | goto out; |
d00a1c72 MZ |
560 | |
561 | /* calculate the size of the returned Blob */ | |
562 | sealinfosize = LOAD32(tb->data, TPM_DATA_OFFSET + sizeof(uint32_t)); | |
563 | encdatasize = LOAD32(tb->data, TPM_DATA_OFFSET + sizeof(uint32_t) + | |
564 | sizeof(uint32_t) + sealinfosize); | |
565 | storedsize = sizeof(uint32_t) + sizeof(uint32_t) + sealinfosize + | |
566 | sizeof(uint32_t) + encdatasize; | |
567 | ||
568 | /* check the HMAC in the response */ | |
569 | ret = TSS_checkhmac1(tb->data, ordinal, td->nonceodd, sess.secret, | |
570 | SHA1_DIGEST_SIZE, storedsize, TPM_DATA_OFFSET, 0, | |
571 | 0); | |
572 | ||
573 | /* copy the returned blob to caller */ | |
bc5e0af0 MZ |
574 | if (!ret) { |
575 | memcpy(blob, tb->data + TPM_DATA_OFFSET, storedsize); | |
576 | *bloblen = storedsize; | |
577 | } | |
40c10017 | 578 | out: |
453431a5 | 579 | kfree_sensitive(td); |
d00a1c72 MZ |
580 | return ret; |
581 | } | |
582 | ||
583 | /* | |
584 | * use the AUTH2_COMMAND form of unseal, to authorize both key and blob | |
585 | */ | |
c6f61e59 | 586 | static int tpm_unseal(struct tpm_buf *tb, |
1bdbb402 MZ |
587 | uint32_t keyhandle, const unsigned char *keyauth, |
588 | const unsigned char *blob, int bloblen, | |
d00a1c72 MZ |
589 | const unsigned char *blobauth, |
590 | unsigned char *data, unsigned int *datalen) | |
591 | { | |
592 | unsigned char nonceodd[TPM_NONCE_SIZE]; | |
593 | unsigned char enonce1[TPM_NONCE_SIZE]; | |
594 | unsigned char enonce2[TPM_NONCE_SIZE]; | |
595 | unsigned char authdata1[SHA1_DIGEST_SIZE]; | |
596 | unsigned char authdata2[SHA1_DIGEST_SIZE]; | |
597 | uint32_t authhandle1 = 0; | |
598 | uint32_t authhandle2 = 0; | |
599 | unsigned char cont = 0; | |
600 | uint32_t ordinal; | |
d00a1c72 MZ |
601 | int ret; |
602 | ||
603 | /* sessions for unsealing key and data */ | |
604 | ret = oiap(tb, &authhandle1, enonce1); | |
605 | if (ret < 0) { | |
5d0682be | 606 | pr_info("oiap failed (%d)\n", ret); |
d00a1c72 MZ |
607 | return ret; |
608 | } | |
609 | ret = oiap(tb, &authhandle2, enonce2); | |
610 | if (ret < 0) { | |
5d0682be | 611 | pr_info("oiap failed (%d)\n", ret); |
d00a1c72 MZ |
612 | return ret; |
613 | } | |
614 | ||
615 | ordinal = htonl(TPM_ORD_UNSEAL); | |
24073043 | 616 | ret = tpm_get_random(chip, nonceodd, TPM_NONCE_SIZE); |
5df16caa JS |
617 | if (ret < 0) |
618 | return ret; | |
619 | ||
41ab999c | 620 | if (ret != TPM_NONCE_SIZE) { |
5d0682be | 621 | pr_info("tpm_get_random failed (%d)\n", ret); |
5df16caa | 622 | return -EIO; |
d00a1c72 | 623 | } |
bc5e0af0 MZ |
624 | ret = TSS_authhmac(authdata1, keyauth, TPM_NONCE_SIZE, |
625 | enonce1, nonceodd, cont, sizeof(uint32_t), | |
626 | &ordinal, bloblen, blob, 0, 0); | |
627 | if (ret < 0) | |
628 | return ret; | |
629 | ret = TSS_authhmac(authdata2, blobauth, TPM_NONCE_SIZE, | |
630 | enonce2, nonceodd, cont, sizeof(uint32_t), | |
631 | &ordinal, bloblen, blob, 0, 0); | |
632 | if (ret < 0) | |
633 | return ret; | |
d00a1c72 MZ |
634 | |
635 | /* build and send TPM request packet */ | |
c6f61e59 SG |
636 | tpm_buf_reset(tb, TPM_TAG_RQU_AUTH2_COMMAND, TPM_ORD_UNSEAL); |
637 | tpm_buf_append_u32(tb, keyhandle); | |
638 | tpm_buf_append(tb, blob, bloblen); | |
639 | tpm_buf_append_u32(tb, authhandle1); | |
640 | tpm_buf_append(tb, nonceodd, TPM_NONCE_SIZE); | |
641 | tpm_buf_append_u8(tb, cont); | |
642 | tpm_buf_append(tb, authdata1, SHA1_DIGEST_SIZE); | |
643 | tpm_buf_append_u32(tb, authhandle2); | |
644 | tpm_buf_append(tb, nonceodd, TPM_NONCE_SIZE); | |
645 | tpm_buf_append_u8(tb, cont); | |
646 | tpm_buf_append(tb, authdata2, SHA1_DIGEST_SIZE); | |
d00a1c72 | 647 | |
e1b72e1b | 648 | ret = trusted_tpm_send(tb->data, tb->length); |
d00a1c72 | 649 | if (ret < 0) { |
5d0682be | 650 | pr_info("authhmac failed (%d)\n", ret); |
d00a1c72 MZ |
651 | return ret; |
652 | } | |
653 | ||
654 | *datalen = LOAD32(tb->data, TPM_DATA_OFFSET); | |
655 | ret = TSS_checkhmac2(tb->data, ordinal, nonceodd, | |
656 | keyauth, SHA1_DIGEST_SIZE, | |
657 | blobauth, SHA1_DIGEST_SIZE, | |
658 | sizeof(uint32_t), TPM_DATA_OFFSET, | |
659 | *datalen, TPM_DATA_OFFSET + sizeof(uint32_t), 0, | |
660 | 0); | |
bc5e0af0 | 661 | if (ret < 0) { |
5d0682be | 662 | pr_info("TSS_checkhmac2 failed (%d)\n", ret); |
bc5e0af0 MZ |
663 | return ret; |
664 | } | |
d00a1c72 | 665 | memcpy(data, tb->data + TPM_DATA_OFFSET + sizeof(uint32_t), *datalen); |
bc5e0af0 | 666 | return 0; |
d00a1c72 MZ |
667 | } |
668 | ||
669 | /* | |
670 | * Have the TPM seal(encrypt) the symmetric key | |
671 | */ | |
672 | static int key_seal(struct trusted_key_payload *p, | |
673 | struct trusted_key_options *o) | |
674 | { | |
c6f61e59 | 675 | struct tpm_buf tb; |
d00a1c72 MZ |
676 | int ret; |
677 | ||
c6f61e59 SG |
678 | ret = tpm_buf_init(&tb, 0, 0); |
679 | if (ret) | |
680 | return ret; | |
d00a1c72 MZ |
681 | |
682 | /* include migratable flag at end of sealed key */ | |
683 | p->key[p->key_len] = p->migratable; | |
684 | ||
c6f61e59 | 685 | ret = tpm_seal(&tb, o->keytype, o->keyhandle, o->keyauth, |
d00a1c72 MZ |
686 | p->key, p->key_len + 1, p->blob, &p->blob_len, |
687 | o->blobauth, o->pcrinfo, o->pcrinfo_len); | |
688 | if (ret < 0) | |
5d0682be | 689 | pr_info("srkseal failed (%d)\n", ret); |
d00a1c72 | 690 | |
c6f61e59 | 691 | tpm_buf_destroy(&tb); |
d00a1c72 MZ |
692 | return ret; |
693 | } | |
694 | ||
695 | /* | |
696 | * Have the TPM unseal(decrypt) the symmetric key | |
697 | */ | |
698 | static int key_unseal(struct trusted_key_payload *p, | |
699 | struct trusted_key_options *o) | |
700 | { | |
c6f61e59 | 701 | struct tpm_buf tb; |
d00a1c72 MZ |
702 | int ret; |
703 | ||
c6f61e59 SG |
704 | ret = tpm_buf_init(&tb, 0, 0); |
705 | if (ret) | |
706 | return ret; | |
d00a1c72 | 707 | |
c6f61e59 | 708 | ret = tpm_unseal(&tb, o->keyhandle, o->keyauth, p->blob, p->blob_len, |
d00a1c72 | 709 | o->blobauth, p->key, &p->key_len); |
d00a1c72 | 710 | if (ret < 0) |
5d0682be | 711 | pr_info("srkunseal failed (%d)\n", ret); |
bc5e0af0 MZ |
712 | else |
713 | /* pull migratable flag out of sealed key */ | |
714 | p->migratable = p->key[--p->key_len]; | |
d00a1c72 | 715 | |
c6f61e59 | 716 | tpm_buf_destroy(&tb); |
d00a1c72 MZ |
717 | return ret; |
718 | } | |
719 | ||
720 | enum { | |
94c13f66 | 721 | Opt_err, |
d00a1c72 | 722 | Opt_keyhandle, Opt_keyauth, Opt_blobauth, |
5ca4c20c JS |
723 | Opt_pcrinfo, Opt_pcrlock, Opt_migratable, |
724 | Opt_hash, | |
5beb0c43 JS |
725 | Opt_policydigest, |
726 | Opt_policyhandle, | |
d00a1c72 MZ |
727 | }; |
728 | ||
729 | static const match_table_t key_tokens = { | |
d00a1c72 MZ |
730 | {Opt_keyhandle, "keyhandle=%s"}, |
731 | {Opt_keyauth, "keyauth=%s"}, | |
732 | {Opt_blobauth, "blobauth=%s"}, | |
733 | {Opt_pcrinfo, "pcrinfo=%s"}, | |
734 | {Opt_pcrlock, "pcrlock=%s"}, | |
735 | {Opt_migratable, "migratable=%s"}, | |
5ca4c20c | 736 | {Opt_hash, "hash=%s"}, |
5beb0c43 JS |
737 | {Opt_policydigest, "policydigest=%s"}, |
738 | {Opt_policyhandle, "policyhandle=%s"}, | |
d00a1c72 MZ |
739 | {Opt_err, NULL} |
740 | }; | |
741 | ||
742 | /* can have zero or more token= options */ | |
743 | static int getoptions(char *c, struct trusted_key_payload *pay, | |
744 | struct trusted_key_options *opt) | |
745 | { | |
746 | substring_t args[MAX_OPT_ARGS]; | |
747 | char *p = c; | |
748 | int token; | |
749 | int res; | |
750 | unsigned long handle; | |
751 | unsigned long lock; | |
5208cc83 | 752 | unsigned long token_mask = 0; |
f3c82ade | 753 | unsigned int digest_len; |
5ca4c20c JS |
754 | int i; |
755 | int tpm2; | |
756 | ||
24073043 | 757 | tpm2 = tpm_is_tpm2(chip); |
5ca4c20c JS |
758 | if (tpm2 < 0) |
759 | return tpm2; | |
760 | ||
761 | opt->hash = tpm2 ? HASH_ALGO_SHA256 : HASH_ALGO_SHA1; | |
d00a1c72 | 762 | |
60dc5f1b JB |
763 | if (!c) |
764 | return 0; | |
765 | ||
d00a1c72 MZ |
766 | while ((p = strsep(&c, " \t"))) { |
767 | if (*p == '\0' || *p == ' ' || *p == '\t') | |
768 | continue; | |
769 | token = match_token(p, key_tokens, args); | |
5208cc83 JS |
770 | if (test_and_set_bit(token, &token_mask)) |
771 | return -EINVAL; | |
d00a1c72 MZ |
772 | |
773 | switch (token) { | |
774 | case Opt_pcrinfo: | |
775 | opt->pcrinfo_len = strlen(args[0].from) / 2; | |
776 | if (opt->pcrinfo_len > MAX_PCRINFO_SIZE) | |
777 | return -EINVAL; | |
2684bf7f MZ |
778 | res = hex2bin(opt->pcrinfo, args[0].from, |
779 | opt->pcrinfo_len); | |
780 | if (res < 0) | |
781 | return -EINVAL; | |
d00a1c72 MZ |
782 | break; |
783 | case Opt_keyhandle: | |
29707b20 | 784 | res = kstrtoul(args[0].from, 16, &handle); |
d00a1c72 MZ |
785 | if (res < 0) |
786 | return -EINVAL; | |
787 | opt->keytype = SEAL_keytype; | |
788 | opt->keyhandle = handle; | |
789 | break; | |
790 | case Opt_keyauth: | |
791 | if (strlen(args[0].from) != 2 * SHA1_DIGEST_SIZE) | |
792 | return -EINVAL; | |
2684bf7f MZ |
793 | res = hex2bin(opt->keyauth, args[0].from, |
794 | SHA1_DIGEST_SIZE); | |
795 | if (res < 0) | |
796 | return -EINVAL; | |
d00a1c72 MZ |
797 | break; |
798 | case Opt_blobauth: | |
de66514d JB |
799 | /* |
800 | * TPM 1.2 authorizations are sha1 hashes passed in as | |
801 | * hex strings. TPM 2.0 authorizations are simple | |
802 | * passwords (although it can take a hash as well) | |
803 | */ | |
804 | opt->blobauth_len = strlen(args[0].from); | |
805 | ||
806 | if (opt->blobauth_len == 2 * TPM_DIGEST_SIZE) { | |
807 | res = hex2bin(opt->blobauth, args[0].from, | |
808 | TPM_DIGEST_SIZE); | |
809 | if (res < 0) | |
810 | return -EINVAL; | |
811 | ||
812 | opt->blobauth_len = TPM_DIGEST_SIZE; | |
813 | break; | |
814 | } | |
815 | ||
816 | if (tpm2 && opt->blobauth_len <= sizeof(opt->blobauth)) { | |
817 | memcpy(opt->blobauth, args[0].from, | |
818 | opt->blobauth_len); | |
819 | break; | |
820 | } | |
821 | ||
822 | return -EINVAL; | |
823 | ||
d00a1c72 | 824 | break; |
de66514d | 825 | |
d00a1c72 MZ |
826 | case Opt_migratable: |
827 | if (*args[0].from == '0') | |
828 | pay->migratable = 0; | |
8da7520c | 829 | else if (*args[0].from != '1') |
d00a1c72 MZ |
830 | return -EINVAL; |
831 | break; | |
832 | case Opt_pcrlock: | |
29707b20 | 833 | res = kstrtoul(args[0].from, 10, &lock); |
d00a1c72 MZ |
834 | if (res < 0) |
835 | return -EINVAL; | |
836 | opt->pcrlock = lock; | |
837 | break; | |
5ca4c20c | 838 | case Opt_hash: |
5beb0c43 JS |
839 | if (test_bit(Opt_policydigest, &token_mask)) |
840 | return -EINVAL; | |
5ca4c20c JS |
841 | for (i = 0; i < HASH_ALGO__LAST; i++) { |
842 | if (!strcmp(args[0].from, hash_algo_name[i])) { | |
843 | opt->hash = i; | |
844 | break; | |
845 | } | |
846 | } | |
847 | if (i == HASH_ALGO__LAST) | |
848 | return -EINVAL; | |
849 | if (!tpm2 && i != HASH_ALGO_SHA1) { | |
5d0682be | 850 | pr_info("TPM 1.x only supports SHA-1.\n"); |
5ca4c20c JS |
851 | return -EINVAL; |
852 | } | |
853 | break; | |
5beb0c43 | 854 | case Opt_policydigest: |
f3c82ade JS |
855 | digest_len = hash_digest_size[opt->hash]; |
856 | if (!tpm2 || strlen(args[0].from) != (2 * digest_len)) | |
5beb0c43 JS |
857 | return -EINVAL; |
858 | res = hex2bin(opt->policydigest, args[0].from, | |
f3c82ade | 859 | digest_len); |
5beb0c43 JS |
860 | if (res < 0) |
861 | return -EINVAL; | |
f3c82ade | 862 | opt->policydigest_len = digest_len; |
5beb0c43 JS |
863 | break; |
864 | case Opt_policyhandle: | |
865 | if (!tpm2) | |
866 | return -EINVAL; | |
867 | res = kstrtoul(args[0].from, 16, &handle); | |
868 | if (res < 0) | |
869 | return -EINVAL; | |
870 | opt->policyhandle = handle; | |
871 | break; | |
d00a1c72 MZ |
872 | default: |
873 | return -EINVAL; | |
874 | } | |
875 | } | |
876 | return 0; | |
877 | } | |
878 | ||
d00a1c72 MZ |
879 | static struct trusted_key_options *trusted_options_alloc(void) |
880 | { | |
881 | struct trusted_key_options *options; | |
0fe54803 JS |
882 | int tpm2; |
883 | ||
24073043 | 884 | tpm2 = tpm_is_tpm2(chip); |
0fe54803 JS |
885 | if (tpm2 < 0) |
886 | return NULL; | |
d00a1c72 MZ |
887 | |
888 | options = kzalloc(sizeof *options, GFP_KERNEL); | |
bc5e0af0 MZ |
889 | if (options) { |
890 | /* set any non-zero defaults */ | |
891 | options->keytype = SRK_keytype; | |
0fe54803 JS |
892 | |
893 | if (!tpm2) | |
894 | options->keyhandle = SRKHANDLE; | |
bc5e0af0 | 895 | } |
d00a1c72 MZ |
896 | return options; |
897 | } | |
898 | ||
5d0682be | 899 | static int trusted_tpm_seal(struct trusted_key_payload *p, char *datablob) |
d00a1c72 | 900 | { |
d00a1c72 | 901 | struct trusted_key_options *options = NULL; |
d00a1c72 | 902 | int ret = 0; |
0fe54803 JS |
903 | int tpm2; |
904 | ||
24073043 | 905 | tpm2 = tpm_is_tpm2(chip); |
0fe54803 JS |
906 | if (tpm2 < 0) |
907 | return tpm2; | |
d00a1c72 | 908 | |
d00a1c72 | 909 | options = trusted_options_alloc(); |
5d0682be SG |
910 | if (!options) |
911 | return -ENOMEM; | |
d00a1c72 | 912 | |
5d0682be SG |
913 | ret = getoptions(datablob, p, options); |
914 | if (ret < 0) | |
d00a1c72 | 915 | goto out; |
5d0682be | 916 | dump_options(options); |
d00a1c72 | 917 | |
f2219745 | 918 | if (!options->keyhandle && !tpm2) { |
0fe54803 JS |
919 | ret = -EINVAL; |
920 | goto out; | |
921 | } | |
922 | ||
5d0682be SG |
923 | if (tpm2) |
924 | ret = tpm2_seal_trusted(chip, p, options); | |
925 | else | |
926 | ret = key_seal(p, options); | |
927 | if (ret < 0) { | |
928 | pr_info("key_seal failed (%d)\n", ret); | |
929 | goto out; | |
930 | } | |
5df16caa | 931 | |
5d0682be SG |
932 | if (options->pcrlock) { |
933 | ret = pcrlock(options->pcrlock); | |
934 | if (ret < 0) { | |
935 | pr_info("pcrlock failed (%d)\n", ret); | |
d00a1c72 MZ |
936 | goto out; |
937 | } | |
d00a1c72 | 938 | } |
d00a1c72 | 939 | out: |
453431a5 | 940 | kfree_sensitive(options); |
d00a1c72 MZ |
941 | return ret; |
942 | } | |
943 | ||
5d0682be | 944 | static int trusted_tpm_unseal(struct trusted_key_payload *p, char *datablob) |
d00a1c72 | 945 | { |
5d0682be | 946 | struct trusted_key_options *options = NULL; |
d00a1c72 | 947 | int ret = 0; |
5d0682be | 948 | int tpm2; |
d00a1c72 | 949 | |
5d0682be SG |
950 | tpm2 = tpm_is_tpm2(chip); |
951 | if (tpm2 < 0) | |
952 | return tpm2; | |
d00a1c72 | 953 | |
5d0682be SG |
954 | options = trusted_options_alloc(); |
955 | if (!options) | |
d00a1c72 | 956 | return -ENOMEM; |
d00a1c72 | 957 | |
5d0682be SG |
958 | ret = getoptions(datablob, p, options); |
959 | if (ret < 0) | |
d00a1c72 | 960 | goto out; |
5d0682be | 961 | dump_options(options); |
0fe54803 | 962 | |
60dc5f1b | 963 | if (!options->keyhandle && !tpm2) { |
0fe54803 | 964 | ret = -EINVAL; |
0fe54803 JS |
965 | goto out; |
966 | } | |
967 | ||
5d0682be SG |
968 | if (tpm2) |
969 | ret = tpm2_unseal_trusted(chip, p, options); | |
970 | else | |
971 | ret = key_unseal(p, options); | |
972 | if (ret < 0) | |
973 | pr_info("key_unseal failed (%d)\n", ret); | |
d00a1c72 | 974 | |
5d0682be SG |
975 | if (options->pcrlock) { |
976 | ret = pcrlock(options->pcrlock); | |
d00a1c72 | 977 | if (ret < 0) { |
5d0682be | 978 | pr_info("pcrlock failed (%d)\n", ret); |
d00a1c72 MZ |
979 | goto out; |
980 | } | |
981 | } | |
d00a1c72 | 982 | out: |
5d0682be | 983 | kfree_sensitive(options); |
d00a1c72 MZ |
984 | return ret; |
985 | } | |
986 | ||
5d0682be | 987 | static int trusted_tpm_get_random(unsigned char *key, size_t key_len) |
d00a1c72 | 988 | { |
5d0682be | 989 | return tpm_get_random(chip, key, key_len); |
d00a1c72 MZ |
990 | } |
991 | ||
d00a1c72 MZ |
992 | static void trusted_shash_release(void) |
993 | { | |
994 | if (hashalg) | |
995 | crypto_free_shash(hashalg); | |
996 | if (hmacalg) | |
997 | crypto_free_shash(hmacalg); | |
998 | } | |
999 | ||
1000 | static int __init trusted_shash_alloc(void) | |
1001 | { | |
1002 | int ret; | |
1003 | ||
3d234b33 | 1004 | hmacalg = crypto_alloc_shash(hmac_alg, 0, 0); |
d00a1c72 | 1005 | if (IS_ERR(hmacalg)) { |
5d0682be | 1006 | pr_info("could not allocate crypto %s\n", |
d00a1c72 MZ |
1007 | hmac_alg); |
1008 | return PTR_ERR(hmacalg); | |
1009 | } | |
1010 | ||
3d234b33 | 1011 | hashalg = crypto_alloc_shash(hash_alg, 0, 0); |
d00a1c72 | 1012 | if (IS_ERR(hashalg)) { |
5d0682be | 1013 | pr_info("could not allocate crypto %s\n", |
d00a1c72 MZ |
1014 | hash_alg); |
1015 | ret = PTR_ERR(hashalg); | |
1016 | goto hashalg_fail; | |
1017 | } | |
1018 | ||
1019 | return 0; | |
1020 | ||
1021 | hashalg_fail: | |
1022 | crypto_free_shash(hmacalg); | |
1023 | return ret; | |
1024 | } | |
1025 | ||
0b6cf6b9 RS |
1026 | static int __init init_digests(void) |
1027 | { | |
9f75c822 RS |
1028 | int i; |
1029 | ||
0b6cf6b9 RS |
1030 | digests = kcalloc(chip->nr_allocated_banks, sizeof(*digests), |
1031 | GFP_KERNEL); | |
1032 | if (!digests) | |
1033 | return -ENOMEM; | |
1034 | ||
9f75c822 RS |
1035 | for (i = 0; i < chip->nr_allocated_banks; i++) |
1036 | digests[i].alg_id = chip->allocated_banks[i].alg_id; | |
1037 | ||
0b6cf6b9 RS |
1038 | return 0; |
1039 | } | |
1040 | ||
5d0682be | 1041 | static int __init trusted_tpm_init(void) |
d00a1c72 MZ |
1042 | { |
1043 | int ret; | |
1044 | ||
24073043 RS |
1045 | chip = tpm_default_chip(); |
1046 | if (!chip) | |
5d0682be | 1047 | return -ENODEV; |
c7871920 | 1048 | |
0b6cf6b9 | 1049 | ret = init_digests(); |
d00a1c72 | 1050 | if (ret < 0) |
24073043 | 1051 | goto err_put; |
0b6cf6b9 RS |
1052 | ret = trusted_shash_alloc(); |
1053 | if (ret < 0) | |
1054 | goto err_free; | |
d00a1c72 MZ |
1055 | ret = register_key_type(&key_type_trusted); |
1056 | if (ret < 0) | |
24073043 RS |
1057 | goto err_release; |
1058 | return 0; | |
1059 | err_release: | |
1060 | trusted_shash_release(); | |
0b6cf6b9 RS |
1061 | err_free: |
1062 | kfree(digests); | |
24073043 RS |
1063 | err_put: |
1064 | put_device(&chip->dev); | |
d00a1c72 MZ |
1065 | return ret; |
1066 | } | |
1067 | ||
5d0682be | 1068 | static void trusted_tpm_exit(void) |
d00a1c72 | 1069 | { |
c7871920 JS |
1070 | if (chip) { |
1071 | put_device(&chip->dev); | |
1072 | kfree(digests); | |
1073 | trusted_shash_release(); | |
1074 | unregister_key_type(&key_type_trusted); | |
1075 | } | |
d00a1c72 MZ |
1076 | } |
1077 | ||
5d0682be SG |
1078 | struct trusted_key_ops trusted_key_tpm_ops = { |
1079 | .migratable = 1, /* migratable by default */ | |
1080 | .init = trusted_tpm_init, | |
1081 | .seal = trusted_tpm_seal, | |
1082 | .unseal = trusted_tpm_unseal, | |
1083 | .get_random = trusted_tpm_get_random, | |
1084 | .exit = trusted_tpm_exit, | |
1085 | }; |