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d00a1c72 MZ |
1 | /* |
2 | * Copyright (C) 2010 IBM Corporation | |
3 | * | |
4 | * Author: | |
5 | * David Safford <safford@us.ibm.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation, version 2 of the License. | |
10 | * | |
5395d312 | 11 | * See Documentation/security/keys/trusted-encrypted.rst |
d00a1c72 MZ |
12 | */ |
13 | ||
5ca4c20c | 14 | #include <crypto/hash_info.h> |
d00a1c72 MZ |
15 | #include <linux/uaccess.h> |
16 | #include <linux/module.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/parser.h> | |
20 | #include <linux/string.h> | |
93ae86e7 | 21 | #include <linux/err.h> |
d00a1c72 MZ |
22 | #include <keys/user-type.h> |
23 | #include <keys/trusted-type.h> | |
24 | #include <linux/key-type.h> | |
25 | #include <linux/rcupdate.h> | |
26 | #include <linux/crypto.h> | |
27 | #include <crypto/hash.h> | |
28 | #include <crypto/sha.h> | |
29 | #include <linux/capability.h> | |
30 | #include <linux/tpm.h> | |
31 | #include <linux/tpm_command.h> | |
32 | ||
4b174b6d | 33 | #include "trusted.h" |
d00a1c72 MZ |
34 | |
35 | static const char hmac_alg[] = "hmac(sha1)"; | |
36 | static const char hash_alg[] = "sha1"; | |
37 | ||
38 | struct sdesc { | |
39 | struct shash_desc shash; | |
40 | char ctx[]; | |
41 | }; | |
42 | ||
43 | static struct crypto_shash *hashalg; | |
44 | static struct crypto_shash *hmacalg; | |
45 | ||
46 | static struct sdesc *init_sdesc(struct crypto_shash *alg) | |
47 | { | |
48 | struct sdesc *sdesc; | |
49 | int size; | |
50 | ||
51 | size = sizeof(struct shash_desc) + crypto_shash_descsize(alg); | |
52 | sdesc = kmalloc(size, GFP_KERNEL); | |
53 | if (!sdesc) | |
54 | return ERR_PTR(-ENOMEM); | |
55 | sdesc->shash.tfm = alg; | |
56 | sdesc->shash.flags = 0x0; | |
57 | return sdesc; | |
58 | } | |
59 | ||
1bdbb402 | 60 | static int TSS_sha1(const unsigned char *data, unsigned int datalen, |
d00a1c72 MZ |
61 | unsigned char *digest) |
62 | { | |
63 | struct sdesc *sdesc; | |
64 | int ret; | |
65 | ||
66 | sdesc = init_sdesc(hashalg); | |
67 | if (IS_ERR(sdesc)) { | |
68 | pr_info("trusted_key: can't alloc %s\n", hash_alg); | |
69 | return PTR_ERR(sdesc); | |
70 | } | |
71 | ||
72 | ret = crypto_shash_digest(&sdesc->shash, data, datalen, digest); | |
ee618b46 | 73 | kzfree(sdesc); |
d00a1c72 MZ |
74 | return ret; |
75 | } | |
76 | ||
77 | static int TSS_rawhmac(unsigned char *digest, const unsigned char *key, | |
1bdbb402 | 78 | unsigned int keylen, ...) |
d00a1c72 MZ |
79 | { |
80 | struct sdesc *sdesc; | |
81 | va_list argp; | |
82 | unsigned int dlen; | |
83 | unsigned char *data; | |
84 | int ret; | |
85 | ||
86 | sdesc = init_sdesc(hmacalg); | |
87 | if (IS_ERR(sdesc)) { | |
88 | pr_info("trusted_key: can't alloc %s\n", hmac_alg); | |
89 | return PTR_ERR(sdesc); | |
90 | } | |
91 | ||
92 | ret = crypto_shash_setkey(hmacalg, key, keylen); | |
93 | if (ret < 0) | |
94 | goto out; | |
95 | ret = crypto_shash_init(&sdesc->shash); | |
96 | if (ret < 0) | |
97 | goto out; | |
98 | ||
99 | va_start(argp, keylen); | |
100 | for (;;) { | |
101 | dlen = va_arg(argp, unsigned int); | |
102 | if (dlen == 0) | |
103 | break; | |
104 | data = va_arg(argp, unsigned char *); | |
35576eab TH |
105 | if (data == NULL) { |
106 | ret = -EINVAL; | |
107 | break; | |
108 | } | |
d00a1c72 MZ |
109 | ret = crypto_shash_update(&sdesc->shash, data, dlen); |
110 | if (ret < 0) | |
35576eab | 111 | break; |
d00a1c72 MZ |
112 | } |
113 | va_end(argp); | |
bc5e0af0 MZ |
114 | if (!ret) |
115 | ret = crypto_shash_final(&sdesc->shash, digest); | |
d00a1c72 | 116 | out: |
ee618b46 | 117 | kzfree(sdesc); |
d00a1c72 MZ |
118 | return ret; |
119 | } | |
120 | ||
121 | /* | |
122 | * calculate authorization info fields to send to TPM | |
123 | */ | |
bc5e0af0 | 124 | static int TSS_authhmac(unsigned char *digest, const unsigned char *key, |
1bdbb402 | 125 | unsigned int keylen, unsigned char *h1, |
bc5e0af0 | 126 | unsigned char *h2, unsigned char h3, ...) |
d00a1c72 MZ |
127 | { |
128 | unsigned char paramdigest[SHA1_DIGEST_SIZE]; | |
129 | struct sdesc *sdesc; | |
130 | unsigned int dlen; | |
131 | unsigned char *data; | |
132 | unsigned char c; | |
133 | int ret; | |
134 | va_list argp; | |
135 | ||
136 | sdesc = init_sdesc(hashalg); | |
137 | if (IS_ERR(sdesc)) { | |
138 | pr_info("trusted_key: can't alloc %s\n", hash_alg); | |
139 | return PTR_ERR(sdesc); | |
140 | } | |
141 | ||
142 | c = h3; | |
143 | ret = crypto_shash_init(&sdesc->shash); | |
144 | if (ret < 0) | |
145 | goto out; | |
146 | va_start(argp, h3); | |
147 | for (;;) { | |
148 | dlen = va_arg(argp, unsigned int); | |
149 | if (dlen == 0) | |
150 | break; | |
151 | data = va_arg(argp, unsigned char *); | |
0e7491f6 TH |
152 | if (!data) { |
153 | ret = -EINVAL; | |
154a96bf | 154 | break; |
0e7491f6 | 155 | } |
d00a1c72 | 156 | ret = crypto_shash_update(&sdesc->shash, data, dlen); |
154a96bf TH |
157 | if (ret < 0) |
158 | break; | |
d00a1c72 MZ |
159 | } |
160 | va_end(argp); | |
154a96bf TH |
161 | if (!ret) |
162 | ret = crypto_shash_final(&sdesc->shash, paramdigest); | |
d00a1c72 | 163 | if (!ret) |
bc5e0af0 MZ |
164 | ret = TSS_rawhmac(digest, key, keylen, SHA1_DIGEST_SIZE, |
165 | paramdigest, TPM_NONCE_SIZE, h1, | |
166 | TPM_NONCE_SIZE, h2, 1, &c, 0, 0); | |
d00a1c72 | 167 | out: |
ee618b46 | 168 | kzfree(sdesc); |
d00a1c72 MZ |
169 | return ret; |
170 | } | |
171 | ||
172 | /* | |
173 | * verify the AUTH1_COMMAND (Seal) result from TPM | |
174 | */ | |
bc5e0af0 MZ |
175 | static int TSS_checkhmac1(unsigned char *buffer, |
176 | const uint32_t command, | |
177 | const unsigned char *ononce, | |
178 | const unsigned char *key, | |
1bdbb402 | 179 | unsigned int keylen, ...) |
d00a1c72 MZ |
180 | { |
181 | uint32_t bufsize; | |
182 | uint16_t tag; | |
183 | uint32_t ordinal; | |
184 | uint32_t result; | |
185 | unsigned char *enonce; | |
186 | unsigned char *continueflag; | |
187 | unsigned char *authdata; | |
188 | unsigned char testhmac[SHA1_DIGEST_SIZE]; | |
189 | unsigned char paramdigest[SHA1_DIGEST_SIZE]; | |
190 | struct sdesc *sdesc; | |
191 | unsigned int dlen; | |
192 | unsigned int dpos; | |
193 | va_list argp; | |
194 | int ret; | |
195 | ||
196 | bufsize = LOAD32(buffer, TPM_SIZE_OFFSET); | |
197 | tag = LOAD16(buffer, 0); | |
198 | ordinal = command; | |
199 | result = LOAD32N(buffer, TPM_RETURN_OFFSET); | |
200 | if (tag == TPM_TAG_RSP_COMMAND) | |
201 | return 0; | |
202 | if (tag != TPM_TAG_RSP_AUTH1_COMMAND) | |
203 | return -EINVAL; | |
204 | authdata = buffer + bufsize - SHA1_DIGEST_SIZE; | |
205 | continueflag = authdata - 1; | |
206 | enonce = continueflag - TPM_NONCE_SIZE; | |
207 | ||
208 | sdesc = init_sdesc(hashalg); | |
209 | if (IS_ERR(sdesc)) { | |
210 | pr_info("trusted_key: can't alloc %s\n", hash_alg); | |
211 | return PTR_ERR(sdesc); | |
212 | } | |
213 | ret = crypto_shash_init(&sdesc->shash); | |
214 | if (ret < 0) | |
215 | goto out; | |
216 | ret = crypto_shash_update(&sdesc->shash, (const u8 *)&result, | |
217 | sizeof result); | |
218 | if (ret < 0) | |
219 | goto out; | |
220 | ret = crypto_shash_update(&sdesc->shash, (const u8 *)&ordinal, | |
221 | sizeof ordinal); | |
222 | if (ret < 0) | |
223 | goto out; | |
224 | va_start(argp, keylen); | |
225 | for (;;) { | |
226 | dlen = va_arg(argp, unsigned int); | |
227 | if (dlen == 0) | |
228 | break; | |
229 | dpos = va_arg(argp, unsigned int); | |
230 | ret = crypto_shash_update(&sdesc->shash, buffer + dpos, dlen); | |
154a96bf TH |
231 | if (ret < 0) |
232 | break; | |
d00a1c72 MZ |
233 | } |
234 | va_end(argp); | |
154a96bf TH |
235 | if (!ret) |
236 | ret = crypto_shash_final(&sdesc->shash, paramdigest); | |
d00a1c72 MZ |
237 | if (ret < 0) |
238 | goto out; | |
bc5e0af0 | 239 | |
d00a1c72 MZ |
240 | ret = TSS_rawhmac(testhmac, key, keylen, SHA1_DIGEST_SIZE, paramdigest, |
241 | TPM_NONCE_SIZE, enonce, TPM_NONCE_SIZE, ononce, | |
242 | 1, continueflag, 0, 0); | |
243 | if (ret < 0) | |
244 | goto out; | |
bc5e0af0 | 245 | |
d00a1c72 MZ |
246 | if (memcmp(testhmac, authdata, SHA1_DIGEST_SIZE)) |
247 | ret = -EINVAL; | |
248 | out: | |
ee618b46 | 249 | kzfree(sdesc); |
d00a1c72 MZ |
250 | return ret; |
251 | } | |
252 | ||
253 | /* | |
254 | * verify the AUTH2_COMMAND (unseal) result from TPM | |
255 | */ | |
bc5e0af0 MZ |
256 | static int TSS_checkhmac2(unsigned char *buffer, |
257 | const uint32_t command, | |
258 | const unsigned char *ononce, | |
259 | const unsigned char *key1, | |
1bdbb402 | 260 | unsigned int keylen1, |
bc5e0af0 | 261 | const unsigned char *key2, |
1bdbb402 | 262 | unsigned int keylen2, ...) |
d00a1c72 MZ |
263 | { |
264 | uint32_t bufsize; | |
265 | uint16_t tag; | |
266 | uint32_t ordinal; | |
267 | uint32_t result; | |
268 | unsigned char *enonce1; | |
269 | unsigned char *continueflag1; | |
270 | unsigned char *authdata1; | |
271 | unsigned char *enonce2; | |
272 | unsigned char *continueflag2; | |
273 | unsigned char *authdata2; | |
274 | unsigned char testhmac1[SHA1_DIGEST_SIZE]; | |
275 | unsigned char testhmac2[SHA1_DIGEST_SIZE]; | |
276 | unsigned char paramdigest[SHA1_DIGEST_SIZE]; | |
277 | struct sdesc *sdesc; | |
278 | unsigned int dlen; | |
279 | unsigned int dpos; | |
280 | va_list argp; | |
281 | int ret; | |
282 | ||
283 | bufsize = LOAD32(buffer, TPM_SIZE_OFFSET); | |
284 | tag = LOAD16(buffer, 0); | |
285 | ordinal = command; | |
286 | result = LOAD32N(buffer, TPM_RETURN_OFFSET); | |
287 | ||
288 | if (tag == TPM_TAG_RSP_COMMAND) | |
289 | return 0; | |
290 | if (tag != TPM_TAG_RSP_AUTH2_COMMAND) | |
291 | return -EINVAL; | |
292 | authdata1 = buffer + bufsize - (SHA1_DIGEST_SIZE + 1 | |
293 | + SHA1_DIGEST_SIZE + SHA1_DIGEST_SIZE); | |
294 | authdata2 = buffer + bufsize - (SHA1_DIGEST_SIZE); | |
295 | continueflag1 = authdata1 - 1; | |
296 | continueflag2 = authdata2 - 1; | |
297 | enonce1 = continueflag1 - TPM_NONCE_SIZE; | |
298 | enonce2 = continueflag2 - TPM_NONCE_SIZE; | |
299 | ||
300 | sdesc = init_sdesc(hashalg); | |
301 | if (IS_ERR(sdesc)) { | |
302 | pr_info("trusted_key: can't alloc %s\n", hash_alg); | |
303 | return PTR_ERR(sdesc); | |
304 | } | |
305 | ret = crypto_shash_init(&sdesc->shash); | |
306 | if (ret < 0) | |
307 | goto out; | |
308 | ret = crypto_shash_update(&sdesc->shash, (const u8 *)&result, | |
309 | sizeof result); | |
310 | if (ret < 0) | |
311 | goto out; | |
312 | ret = crypto_shash_update(&sdesc->shash, (const u8 *)&ordinal, | |
313 | sizeof ordinal); | |
314 | if (ret < 0) | |
315 | goto out; | |
316 | ||
317 | va_start(argp, keylen2); | |
318 | for (;;) { | |
319 | dlen = va_arg(argp, unsigned int); | |
320 | if (dlen == 0) | |
321 | break; | |
322 | dpos = va_arg(argp, unsigned int); | |
323 | ret = crypto_shash_update(&sdesc->shash, buffer + dpos, dlen); | |
154a96bf TH |
324 | if (ret < 0) |
325 | break; | |
d00a1c72 | 326 | } |
bc5e0af0 | 327 | va_end(argp); |
154a96bf TH |
328 | if (!ret) |
329 | ret = crypto_shash_final(&sdesc->shash, paramdigest); | |
d00a1c72 MZ |
330 | if (ret < 0) |
331 | goto out; | |
332 | ||
333 | ret = TSS_rawhmac(testhmac1, key1, keylen1, SHA1_DIGEST_SIZE, | |
334 | paramdigest, TPM_NONCE_SIZE, enonce1, | |
335 | TPM_NONCE_SIZE, ononce, 1, continueflag1, 0, 0); | |
bc5e0af0 MZ |
336 | if (ret < 0) |
337 | goto out; | |
d00a1c72 MZ |
338 | if (memcmp(testhmac1, authdata1, SHA1_DIGEST_SIZE)) { |
339 | ret = -EINVAL; | |
340 | goto out; | |
341 | } | |
342 | ret = TSS_rawhmac(testhmac2, key2, keylen2, SHA1_DIGEST_SIZE, | |
343 | paramdigest, TPM_NONCE_SIZE, enonce2, | |
344 | TPM_NONCE_SIZE, ononce, 1, continueflag2, 0, 0); | |
bc5e0af0 MZ |
345 | if (ret < 0) |
346 | goto out; | |
d00a1c72 MZ |
347 | if (memcmp(testhmac2, authdata2, SHA1_DIGEST_SIZE)) |
348 | ret = -EINVAL; | |
349 | out: | |
ee618b46 | 350 | kzfree(sdesc); |
d00a1c72 MZ |
351 | return ret; |
352 | } | |
353 | ||
354 | /* | |
355 | * For key specific tpm requests, we will generate and send our | |
356 | * own TPM command packets using the drivers send function. | |
357 | */ | |
358 | static int trusted_tpm_send(const u32 chip_num, unsigned char *cmd, | |
359 | size_t buflen) | |
360 | { | |
361 | int rc; | |
362 | ||
363 | dump_tpm_buf(cmd); | |
364 | rc = tpm_send(chip_num, cmd, buflen); | |
365 | dump_tpm_buf(cmd); | |
366 | if (rc > 0) | |
367 | /* Can't return positive return codes values to keyctl */ | |
368 | rc = -EPERM; | |
369 | return rc; | |
370 | } | |
371 | ||
d00a1c72 MZ |
372 | /* |
373 | * Lock a trusted key, by extending a selected PCR. | |
374 | * | |
375 | * Prevents a trusted key that is sealed to PCRs from being accessed. | |
376 | * This uses the tpm driver's extend function. | |
377 | */ | |
378 | static int pcrlock(const int pcrnum) | |
379 | { | |
380 | unsigned char hash[SHA1_DIGEST_SIZE]; | |
bc5e0af0 | 381 | int ret; |
d00a1c72 MZ |
382 | |
383 | if (!capable(CAP_SYS_ADMIN)) | |
384 | return -EPERM; | |
41ab999c KY |
385 | ret = tpm_get_random(TPM_ANY_NUM, hash, SHA1_DIGEST_SIZE); |
386 | if (ret != SHA1_DIGEST_SIZE) | |
bc5e0af0 | 387 | return ret; |
d00a1c72 MZ |
388 | return tpm_pcr_extend(TPM_ANY_NUM, pcrnum, hash) ? -EINVAL : 0; |
389 | } | |
390 | ||
391 | /* | |
392 | * Create an object specific authorisation protocol (OSAP) session | |
393 | */ | |
394 | static int osap(struct tpm_buf *tb, struct osapsess *s, | |
1bdbb402 | 395 | const unsigned char *key, uint16_t type, uint32_t handle) |
d00a1c72 MZ |
396 | { |
397 | unsigned char enonce[TPM_NONCE_SIZE]; | |
398 | unsigned char ononce[TPM_NONCE_SIZE]; | |
399 | int ret; | |
400 | ||
41ab999c KY |
401 | ret = tpm_get_random(TPM_ANY_NUM, ononce, TPM_NONCE_SIZE); |
402 | if (ret != TPM_NONCE_SIZE) | |
d00a1c72 MZ |
403 | return ret; |
404 | ||
405 | INIT_BUF(tb); | |
406 | store16(tb, TPM_TAG_RQU_COMMAND); | |
407 | store32(tb, TPM_OSAP_SIZE); | |
408 | store32(tb, TPM_ORD_OSAP); | |
409 | store16(tb, type); | |
410 | store32(tb, handle); | |
411 | storebytes(tb, ononce, TPM_NONCE_SIZE); | |
412 | ||
413 | ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, MAX_BUF_SIZE); | |
414 | if (ret < 0) | |
415 | return ret; | |
416 | ||
417 | s->handle = LOAD32(tb->data, TPM_DATA_OFFSET); | |
418 | memcpy(s->enonce, &(tb->data[TPM_DATA_OFFSET + sizeof(uint32_t)]), | |
419 | TPM_NONCE_SIZE); | |
420 | memcpy(enonce, &(tb->data[TPM_DATA_OFFSET + sizeof(uint32_t) + | |
421 | TPM_NONCE_SIZE]), TPM_NONCE_SIZE); | |
bc5e0af0 MZ |
422 | return TSS_rawhmac(s->secret, key, SHA1_DIGEST_SIZE, TPM_NONCE_SIZE, |
423 | enonce, TPM_NONCE_SIZE, ononce, 0, 0); | |
d00a1c72 MZ |
424 | } |
425 | ||
426 | /* | |
427 | * Create an object independent authorisation protocol (oiap) session | |
428 | */ | |
429 | static int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce) | |
430 | { | |
431 | int ret; | |
432 | ||
433 | INIT_BUF(tb); | |
434 | store16(tb, TPM_TAG_RQU_COMMAND); | |
435 | store32(tb, TPM_OIAP_SIZE); | |
436 | store32(tb, TPM_ORD_OIAP); | |
437 | ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, MAX_BUF_SIZE); | |
438 | if (ret < 0) | |
439 | return ret; | |
440 | ||
441 | *handle = LOAD32(tb->data, TPM_DATA_OFFSET); | |
442 | memcpy(nonce, &tb->data[TPM_DATA_OFFSET + sizeof(uint32_t)], | |
443 | TPM_NONCE_SIZE); | |
bc5e0af0 | 444 | return 0; |
d00a1c72 MZ |
445 | } |
446 | ||
447 | struct tpm_digests { | |
448 | unsigned char encauth[SHA1_DIGEST_SIZE]; | |
449 | unsigned char pubauth[SHA1_DIGEST_SIZE]; | |
450 | unsigned char xorwork[SHA1_DIGEST_SIZE * 2]; | |
451 | unsigned char xorhash[SHA1_DIGEST_SIZE]; | |
452 | unsigned char nonceodd[TPM_NONCE_SIZE]; | |
453 | }; | |
454 | ||
455 | /* | |
456 | * Have the TPM seal(encrypt) the trusted key, possibly based on | |
457 | * Platform Configuration Registers (PCRs). AUTH1 for sealing key. | |
458 | */ | |
1bdbb402 MZ |
459 | static int tpm_seal(struct tpm_buf *tb, uint16_t keytype, |
460 | uint32_t keyhandle, const unsigned char *keyauth, | |
461 | const unsigned char *data, uint32_t datalen, | |
d00a1c72 MZ |
462 | unsigned char *blob, uint32_t *bloblen, |
463 | const unsigned char *blobauth, | |
1bdbb402 | 464 | const unsigned char *pcrinfo, uint32_t pcrinfosize) |
d00a1c72 MZ |
465 | { |
466 | struct osapsess sess; | |
467 | struct tpm_digests *td; | |
468 | unsigned char cont; | |
469 | uint32_t ordinal; | |
470 | uint32_t pcrsize; | |
471 | uint32_t datsize; | |
472 | int sealinfosize; | |
473 | int encdatasize; | |
474 | int storedsize; | |
475 | int ret; | |
476 | int i; | |
477 | ||
478 | /* alloc some work space for all the hashes */ | |
479 | td = kmalloc(sizeof *td, GFP_KERNEL); | |
480 | if (!td) | |
481 | return -ENOMEM; | |
482 | ||
483 | /* get session for sealing key */ | |
484 | ret = osap(tb, &sess, keyauth, keytype, keyhandle); | |
485 | if (ret < 0) | |
40c10017 | 486 | goto out; |
d00a1c72 MZ |
487 | dump_sess(&sess); |
488 | ||
489 | /* calculate encrypted authorization value */ | |
490 | memcpy(td->xorwork, sess.secret, SHA1_DIGEST_SIZE); | |
491 | memcpy(td->xorwork + SHA1_DIGEST_SIZE, sess.enonce, SHA1_DIGEST_SIZE); | |
492 | ret = TSS_sha1(td->xorwork, SHA1_DIGEST_SIZE * 2, td->xorhash); | |
493 | if (ret < 0) | |
40c10017 | 494 | goto out; |
d00a1c72 | 495 | |
41ab999c KY |
496 | ret = tpm_get_random(TPM_ANY_NUM, td->nonceodd, TPM_NONCE_SIZE); |
497 | if (ret != TPM_NONCE_SIZE) | |
40c10017 | 498 | goto out; |
d00a1c72 MZ |
499 | ordinal = htonl(TPM_ORD_SEAL); |
500 | datsize = htonl(datalen); | |
501 | pcrsize = htonl(pcrinfosize); | |
502 | cont = 0; | |
503 | ||
504 | /* encrypt data authorization key */ | |
505 | for (i = 0; i < SHA1_DIGEST_SIZE; ++i) | |
506 | td->encauth[i] = td->xorhash[i] ^ blobauth[i]; | |
507 | ||
508 | /* calculate authorization HMAC value */ | |
509 | if (pcrinfosize == 0) { | |
510 | /* no pcr info specified */ | |
bc5e0af0 MZ |
511 | ret = TSS_authhmac(td->pubauth, sess.secret, SHA1_DIGEST_SIZE, |
512 | sess.enonce, td->nonceodd, cont, | |
513 | sizeof(uint32_t), &ordinal, SHA1_DIGEST_SIZE, | |
514 | td->encauth, sizeof(uint32_t), &pcrsize, | |
515 | sizeof(uint32_t), &datsize, datalen, data, 0, | |
516 | 0); | |
d00a1c72 MZ |
517 | } else { |
518 | /* 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 | pcrinfosize, pcrinfo, sizeof(uint32_t), | |
524 | &datsize, datalen, data, 0, 0); | |
d00a1c72 | 525 | } |
bc5e0af0 | 526 | if (ret < 0) |
40c10017 | 527 | goto out; |
d00a1c72 MZ |
528 | |
529 | /* build and send the TPM request packet */ | |
530 | INIT_BUF(tb); | |
531 | store16(tb, TPM_TAG_RQU_AUTH1_COMMAND); | |
532 | store32(tb, TPM_SEAL_SIZE + pcrinfosize + datalen); | |
533 | store32(tb, TPM_ORD_SEAL); | |
534 | store32(tb, keyhandle); | |
535 | storebytes(tb, td->encauth, SHA1_DIGEST_SIZE); | |
536 | store32(tb, pcrinfosize); | |
537 | storebytes(tb, pcrinfo, pcrinfosize); | |
538 | store32(tb, datalen); | |
539 | storebytes(tb, data, datalen); | |
540 | store32(tb, sess.handle); | |
541 | storebytes(tb, td->nonceodd, TPM_NONCE_SIZE); | |
542 | store8(tb, cont); | |
543 | storebytes(tb, td->pubauth, SHA1_DIGEST_SIZE); | |
544 | ||
545 | ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, MAX_BUF_SIZE); | |
546 | if (ret < 0) | |
40c10017 | 547 | goto out; |
d00a1c72 MZ |
548 | |
549 | /* calculate the size of the returned Blob */ | |
550 | sealinfosize = LOAD32(tb->data, TPM_DATA_OFFSET + sizeof(uint32_t)); | |
551 | encdatasize = LOAD32(tb->data, TPM_DATA_OFFSET + sizeof(uint32_t) + | |
552 | sizeof(uint32_t) + sealinfosize); | |
553 | storedsize = sizeof(uint32_t) + sizeof(uint32_t) + sealinfosize + | |
554 | sizeof(uint32_t) + encdatasize; | |
555 | ||
556 | /* check the HMAC in the response */ | |
557 | ret = TSS_checkhmac1(tb->data, ordinal, td->nonceodd, sess.secret, | |
558 | SHA1_DIGEST_SIZE, storedsize, TPM_DATA_OFFSET, 0, | |
559 | 0); | |
560 | ||
561 | /* copy the returned blob to caller */ | |
bc5e0af0 MZ |
562 | if (!ret) { |
563 | memcpy(blob, tb->data + TPM_DATA_OFFSET, storedsize); | |
564 | *bloblen = storedsize; | |
565 | } | |
40c10017 | 566 | out: |
ee618b46 | 567 | kzfree(td); |
d00a1c72 MZ |
568 | return ret; |
569 | } | |
570 | ||
571 | /* | |
572 | * use the AUTH2_COMMAND form of unseal, to authorize both key and blob | |
573 | */ | |
574 | static int tpm_unseal(struct tpm_buf *tb, | |
1bdbb402 MZ |
575 | uint32_t keyhandle, const unsigned char *keyauth, |
576 | const unsigned char *blob, int bloblen, | |
d00a1c72 MZ |
577 | const unsigned char *blobauth, |
578 | unsigned char *data, unsigned int *datalen) | |
579 | { | |
580 | unsigned char nonceodd[TPM_NONCE_SIZE]; | |
581 | unsigned char enonce1[TPM_NONCE_SIZE]; | |
582 | unsigned char enonce2[TPM_NONCE_SIZE]; | |
583 | unsigned char authdata1[SHA1_DIGEST_SIZE]; | |
584 | unsigned char authdata2[SHA1_DIGEST_SIZE]; | |
585 | uint32_t authhandle1 = 0; | |
586 | uint32_t authhandle2 = 0; | |
587 | unsigned char cont = 0; | |
588 | uint32_t ordinal; | |
589 | uint32_t keyhndl; | |
590 | int ret; | |
591 | ||
592 | /* sessions for unsealing key and data */ | |
593 | ret = oiap(tb, &authhandle1, enonce1); | |
594 | if (ret < 0) { | |
595 | pr_info("trusted_key: oiap failed (%d)\n", ret); | |
596 | return ret; | |
597 | } | |
598 | ret = oiap(tb, &authhandle2, enonce2); | |
599 | if (ret < 0) { | |
600 | pr_info("trusted_key: oiap failed (%d)\n", ret); | |
601 | return ret; | |
602 | } | |
603 | ||
604 | ordinal = htonl(TPM_ORD_UNSEAL); | |
605 | keyhndl = htonl(SRKHANDLE); | |
41ab999c KY |
606 | ret = tpm_get_random(TPM_ANY_NUM, nonceodd, TPM_NONCE_SIZE); |
607 | if (ret != TPM_NONCE_SIZE) { | |
d00a1c72 MZ |
608 | pr_info("trusted_key: tpm_get_random failed (%d)\n", ret); |
609 | return ret; | |
610 | } | |
bc5e0af0 MZ |
611 | ret = TSS_authhmac(authdata1, keyauth, TPM_NONCE_SIZE, |
612 | enonce1, nonceodd, cont, sizeof(uint32_t), | |
613 | &ordinal, bloblen, blob, 0, 0); | |
614 | if (ret < 0) | |
615 | return ret; | |
616 | ret = TSS_authhmac(authdata2, blobauth, TPM_NONCE_SIZE, | |
617 | enonce2, nonceodd, cont, sizeof(uint32_t), | |
618 | &ordinal, bloblen, blob, 0, 0); | |
619 | if (ret < 0) | |
620 | return ret; | |
d00a1c72 MZ |
621 | |
622 | /* build and send TPM request packet */ | |
623 | INIT_BUF(tb); | |
624 | store16(tb, TPM_TAG_RQU_AUTH2_COMMAND); | |
625 | store32(tb, TPM_UNSEAL_SIZE + bloblen); | |
626 | store32(tb, TPM_ORD_UNSEAL); | |
627 | store32(tb, keyhandle); | |
628 | storebytes(tb, blob, bloblen); | |
629 | store32(tb, authhandle1); | |
630 | storebytes(tb, nonceodd, TPM_NONCE_SIZE); | |
631 | store8(tb, cont); | |
632 | storebytes(tb, authdata1, SHA1_DIGEST_SIZE); | |
633 | store32(tb, authhandle2); | |
634 | storebytes(tb, nonceodd, TPM_NONCE_SIZE); | |
635 | store8(tb, cont); | |
636 | storebytes(tb, authdata2, SHA1_DIGEST_SIZE); | |
637 | ||
638 | ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, MAX_BUF_SIZE); | |
639 | if (ret < 0) { | |
640 | pr_info("trusted_key: authhmac failed (%d)\n", ret); | |
641 | return ret; | |
642 | } | |
643 | ||
644 | *datalen = LOAD32(tb->data, TPM_DATA_OFFSET); | |
645 | ret = TSS_checkhmac2(tb->data, ordinal, nonceodd, | |
646 | keyauth, SHA1_DIGEST_SIZE, | |
647 | blobauth, SHA1_DIGEST_SIZE, | |
648 | sizeof(uint32_t), TPM_DATA_OFFSET, | |
649 | *datalen, TPM_DATA_OFFSET + sizeof(uint32_t), 0, | |
650 | 0); | |
bc5e0af0 | 651 | if (ret < 0) { |
d00a1c72 | 652 | pr_info("trusted_key: TSS_checkhmac2 failed (%d)\n", ret); |
bc5e0af0 MZ |
653 | return ret; |
654 | } | |
d00a1c72 | 655 | memcpy(data, tb->data + TPM_DATA_OFFSET + sizeof(uint32_t), *datalen); |
bc5e0af0 | 656 | return 0; |
d00a1c72 MZ |
657 | } |
658 | ||
659 | /* | |
660 | * Have the TPM seal(encrypt) the symmetric key | |
661 | */ | |
662 | static int key_seal(struct trusted_key_payload *p, | |
663 | struct trusted_key_options *o) | |
664 | { | |
665 | struct tpm_buf *tb; | |
666 | int ret; | |
667 | ||
668 | tb = kzalloc(sizeof *tb, GFP_KERNEL); | |
669 | if (!tb) | |
670 | return -ENOMEM; | |
671 | ||
672 | /* include migratable flag at end of sealed key */ | |
673 | p->key[p->key_len] = p->migratable; | |
674 | ||
675 | ret = tpm_seal(tb, o->keytype, o->keyhandle, o->keyauth, | |
676 | p->key, p->key_len + 1, p->blob, &p->blob_len, | |
677 | o->blobauth, o->pcrinfo, o->pcrinfo_len); | |
678 | if (ret < 0) | |
679 | pr_info("trusted_key: srkseal failed (%d)\n", ret); | |
680 | ||
ee618b46 | 681 | kzfree(tb); |
d00a1c72 MZ |
682 | return ret; |
683 | } | |
684 | ||
685 | /* | |
686 | * Have the TPM unseal(decrypt) the symmetric key | |
687 | */ | |
688 | static int key_unseal(struct trusted_key_payload *p, | |
689 | struct trusted_key_options *o) | |
690 | { | |
691 | struct tpm_buf *tb; | |
692 | int ret; | |
693 | ||
694 | tb = kzalloc(sizeof *tb, GFP_KERNEL); | |
695 | if (!tb) | |
696 | return -ENOMEM; | |
697 | ||
698 | ret = tpm_unseal(tb, o->keyhandle, o->keyauth, p->blob, p->blob_len, | |
699 | o->blobauth, p->key, &p->key_len); | |
d00a1c72 MZ |
700 | if (ret < 0) |
701 | pr_info("trusted_key: srkunseal failed (%d)\n", ret); | |
bc5e0af0 MZ |
702 | else |
703 | /* pull migratable flag out of sealed key */ | |
704 | p->migratable = p->key[--p->key_len]; | |
d00a1c72 | 705 | |
ee618b46 | 706 | kzfree(tb); |
d00a1c72 MZ |
707 | return ret; |
708 | } | |
709 | ||
710 | enum { | |
711 | Opt_err = -1, | |
712 | Opt_new, Opt_load, Opt_update, | |
713 | Opt_keyhandle, Opt_keyauth, Opt_blobauth, | |
5ca4c20c JS |
714 | Opt_pcrinfo, Opt_pcrlock, Opt_migratable, |
715 | Opt_hash, | |
5beb0c43 JS |
716 | Opt_policydigest, |
717 | Opt_policyhandle, | |
d00a1c72 MZ |
718 | }; |
719 | ||
720 | static const match_table_t key_tokens = { | |
721 | {Opt_new, "new"}, | |
722 | {Opt_load, "load"}, | |
723 | {Opt_update, "update"}, | |
724 | {Opt_keyhandle, "keyhandle=%s"}, | |
725 | {Opt_keyauth, "keyauth=%s"}, | |
726 | {Opt_blobauth, "blobauth=%s"}, | |
727 | {Opt_pcrinfo, "pcrinfo=%s"}, | |
728 | {Opt_pcrlock, "pcrlock=%s"}, | |
729 | {Opt_migratable, "migratable=%s"}, | |
5ca4c20c | 730 | {Opt_hash, "hash=%s"}, |
5beb0c43 JS |
731 | {Opt_policydigest, "policydigest=%s"}, |
732 | {Opt_policyhandle, "policyhandle=%s"}, | |
d00a1c72 MZ |
733 | {Opt_err, NULL} |
734 | }; | |
735 | ||
736 | /* can have zero or more token= options */ | |
737 | static int getoptions(char *c, struct trusted_key_payload *pay, | |
738 | struct trusted_key_options *opt) | |
739 | { | |
740 | substring_t args[MAX_OPT_ARGS]; | |
741 | char *p = c; | |
742 | int token; | |
743 | int res; | |
744 | unsigned long handle; | |
745 | unsigned long lock; | |
5208cc83 | 746 | unsigned long token_mask = 0; |
f3c82ade | 747 | unsigned int digest_len; |
5ca4c20c JS |
748 | int i; |
749 | int tpm2; | |
750 | ||
751 | tpm2 = tpm_is_tpm2(TPM_ANY_NUM); | |
752 | if (tpm2 < 0) | |
753 | return tpm2; | |
754 | ||
755 | opt->hash = tpm2 ? HASH_ALGO_SHA256 : HASH_ALGO_SHA1; | |
d00a1c72 MZ |
756 | |
757 | while ((p = strsep(&c, " \t"))) { | |
758 | if (*p == '\0' || *p == ' ' || *p == '\t') | |
759 | continue; | |
760 | token = match_token(p, key_tokens, args); | |
5208cc83 JS |
761 | if (test_and_set_bit(token, &token_mask)) |
762 | return -EINVAL; | |
d00a1c72 MZ |
763 | |
764 | switch (token) { | |
765 | case Opt_pcrinfo: | |
766 | opt->pcrinfo_len = strlen(args[0].from) / 2; | |
767 | if (opt->pcrinfo_len > MAX_PCRINFO_SIZE) | |
768 | return -EINVAL; | |
2684bf7f MZ |
769 | res = hex2bin(opt->pcrinfo, args[0].from, |
770 | opt->pcrinfo_len); | |
771 | if (res < 0) | |
772 | return -EINVAL; | |
d00a1c72 MZ |
773 | break; |
774 | case Opt_keyhandle: | |
29707b20 | 775 | res = kstrtoul(args[0].from, 16, &handle); |
d00a1c72 MZ |
776 | if (res < 0) |
777 | return -EINVAL; | |
778 | opt->keytype = SEAL_keytype; | |
779 | opt->keyhandle = handle; | |
780 | break; | |
781 | case Opt_keyauth: | |
782 | if (strlen(args[0].from) != 2 * SHA1_DIGEST_SIZE) | |
783 | return -EINVAL; | |
2684bf7f MZ |
784 | res = hex2bin(opt->keyauth, args[0].from, |
785 | SHA1_DIGEST_SIZE); | |
786 | if (res < 0) | |
787 | return -EINVAL; | |
d00a1c72 MZ |
788 | break; |
789 | case Opt_blobauth: | |
790 | if (strlen(args[0].from) != 2 * SHA1_DIGEST_SIZE) | |
791 | return -EINVAL; | |
2684bf7f MZ |
792 | res = hex2bin(opt->blobauth, args[0].from, |
793 | SHA1_DIGEST_SIZE); | |
794 | if (res < 0) | |
795 | return -EINVAL; | |
d00a1c72 MZ |
796 | break; |
797 | case Opt_migratable: | |
798 | if (*args[0].from == '0') | |
799 | pay->migratable = 0; | |
800 | else | |
801 | return -EINVAL; | |
802 | break; | |
803 | case Opt_pcrlock: | |
29707b20 | 804 | res = kstrtoul(args[0].from, 10, &lock); |
d00a1c72 MZ |
805 | if (res < 0) |
806 | return -EINVAL; | |
807 | opt->pcrlock = lock; | |
808 | break; | |
5ca4c20c | 809 | case Opt_hash: |
5beb0c43 JS |
810 | if (test_bit(Opt_policydigest, &token_mask)) |
811 | return -EINVAL; | |
5ca4c20c JS |
812 | for (i = 0; i < HASH_ALGO__LAST; i++) { |
813 | if (!strcmp(args[0].from, hash_algo_name[i])) { | |
814 | opt->hash = i; | |
815 | break; | |
816 | } | |
817 | } | |
818 | if (i == HASH_ALGO__LAST) | |
819 | return -EINVAL; | |
820 | if (!tpm2 && i != HASH_ALGO_SHA1) { | |
821 | pr_info("trusted_key: TPM 1.x only supports SHA-1.\n"); | |
822 | return -EINVAL; | |
823 | } | |
824 | break; | |
5beb0c43 | 825 | case Opt_policydigest: |
f3c82ade JS |
826 | digest_len = hash_digest_size[opt->hash]; |
827 | if (!tpm2 || strlen(args[0].from) != (2 * digest_len)) | |
5beb0c43 JS |
828 | return -EINVAL; |
829 | res = hex2bin(opt->policydigest, args[0].from, | |
f3c82ade | 830 | digest_len); |
5beb0c43 JS |
831 | if (res < 0) |
832 | return -EINVAL; | |
f3c82ade | 833 | opt->policydigest_len = digest_len; |
5beb0c43 JS |
834 | break; |
835 | case Opt_policyhandle: | |
836 | if (!tpm2) | |
837 | return -EINVAL; | |
838 | res = kstrtoul(args[0].from, 16, &handle); | |
839 | if (res < 0) | |
840 | return -EINVAL; | |
841 | opt->policyhandle = handle; | |
842 | break; | |
d00a1c72 MZ |
843 | default: |
844 | return -EINVAL; | |
845 | } | |
846 | } | |
847 | return 0; | |
848 | } | |
849 | ||
850 | /* | |
851 | * datablob_parse - parse the keyctl data and fill in the | |
852 | * payload and options structures | |
853 | * | |
854 | * On success returns 0, otherwise -EINVAL. | |
855 | */ | |
856 | static int datablob_parse(char *datablob, struct trusted_key_payload *p, | |
857 | struct trusted_key_options *o) | |
858 | { | |
859 | substring_t args[MAX_OPT_ARGS]; | |
860 | long keylen; | |
861 | int ret = -EINVAL; | |
862 | int key_cmd; | |
863 | char *c; | |
864 | ||
865 | /* main command */ | |
866 | c = strsep(&datablob, " \t"); | |
867 | if (!c) | |
868 | return -EINVAL; | |
869 | key_cmd = match_token(c, key_tokens, args); | |
870 | switch (key_cmd) { | |
871 | case Opt_new: | |
872 | /* first argument is key size */ | |
873 | c = strsep(&datablob, " \t"); | |
874 | if (!c) | |
875 | return -EINVAL; | |
29707b20 | 876 | ret = kstrtol(c, 10, &keylen); |
d00a1c72 MZ |
877 | if (ret < 0 || keylen < MIN_KEY_SIZE || keylen > MAX_KEY_SIZE) |
878 | return -EINVAL; | |
879 | p->key_len = keylen; | |
880 | ret = getoptions(datablob, p, o); | |
881 | if (ret < 0) | |
882 | return ret; | |
883 | ret = Opt_new; | |
884 | break; | |
885 | case Opt_load: | |
886 | /* first argument is sealed blob */ | |
887 | c = strsep(&datablob, " \t"); | |
888 | if (!c) | |
889 | return -EINVAL; | |
890 | p->blob_len = strlen(c) / 2; | |
891 | if (p->blob_len > MAX_BLOB_SIZE) | |
892 | return -EINVAL; | |
2684bf7f MZ |
893 | ret = hex2bin(p->blob, c, p->blob_len); |
894 | if (ret < 0) | |
895 | return -EINVAL; | |
d00a1c72 MZ |
896 | ret = getoptions(datablob, p, o); |
897 | if (ret < 0) | |
898 | return ret; | |
899 | ret = Opt_load; | |
900 | break; | |
901 | case Opt_update: | |
902 | /* all arguments are options */ | |
903 | ret = getoptions(datablob, p, o); | |
904 | if (ret < 0) | |
905 | return ret; | |
906 | ret = Opt_update; | |
907 | break; | |
908 | case Opt_err: | |
909 | return -EINVAL; | |
910 | break; | |
911 | } | |
912 | return ret; | |
913 | } | |
914 | ||
915 | static struct trusted_key_options *trusted_options_alloc(void) | |
916 | { | |
917 | struct trusted_key_options *options; | |
0fe54803 JS |
918 | int tpm2; |
919 | ||
920 | tpm2 = tpm_is_tpm2(TPM_ANY_NUM); | |
921 | if (tpm2 < 0) | |
922 | return NULL; | |
d00a1c72 MZ |
923 | |
924 | options = kzalloc(sizeof *options, GFP_KERNEL); | |
bc5e0af0 MZ |
925 | if (options) { |
926 | /* set any non-zero defaults */ | |
927 | options->keytype = SRK_keytype; | |
0fe54803 JS |
928 | |
929 | if (!tpm2) | |
930 | options->keyhandle = SRKHANDLE; | |
bc5e0af0 | 931 | } |
d00a1c72 MZ |
932 | return options; |
933 | } | |
934 | ||
935 | static struct trusted_key_payload *trusted_payload_alloc(struct key *key) | |
936 | { | |
937 | struct trusted_key_payload *p = NULL; | |
938 | int ret; | |
939 | ||
940 | ret = key_payload_reserve(key, sizeof *p); | |
941 | if (ret < 0) | |
942 | return p; | |
943 | p = kzalloc(sizeof *p, GFP_KERNEL); | |
bc5e0af0 MZ |
944 | if (p) |
945 | p->migratable = 1; /* migratable by default */ | |
d00a1c72 MZ |
946 | return p; |
947 | } | |
948 | ||
949 | /* | |
950 | * trusted_instantiate - create a new trusted key | |
951 | * | |
952 | * Unseal an existing trusted blob or, for a new key, get a | |
953 | * random key, then seal and create a trusted key-type key, | |
954 | * adding it to the specified keyring. | |
955 | * | |
956 | * On success, return 0. Otherwise return errno. | |
957 | */ | |
cf7f601c DH |
958 | static int trusted_instantiate(struct key *key, |
959 | struct key_preparsed_payload *prep) | |
d00a1c72 MZ |
960 | { |
961 | struct trusted_key_payload *payload = NULL; | |
962 | struct trusted_key_options *options = NULL; | |
cf7f601c | 963 | size_t datalen = prep->datalen; |
d00a1c72 MZ |
964 | char *datablob; |
965 | int ret = 0; | |
966 | int key_cmd; | |
41ab999c | 967 | size_t key_len; |
0fe54803 JS |
968 | int tpm2; |
969 | ||
970 | tpm2 = tpm_is_tpm2(TPM_ANY_NUM); | |
971 | if (tpm2 < 0) | |
972 | return tpm2; | |
d00a1c72 | 973 | |
cf7f601c | 974 | if (datalen <= 0 || datalen > 32767 || !prep->data) |
d00a1c72 MZ |
975 | return -EINVAL; |
976 | ||
977 | datablob = kmalloc(datalen + 1, GFP_KERNEL); | |
978 | if (!datablob) | |
979 | return -ENOMEM; | |
cf7f601c | 980 | memcpy(datablob, prep->data, datalen); |
d00a1c72 MZ |
981 | datablob[datalen] = '\0'; |
982 | ||
983 | options = trusted_options_alloc(); | |
984 | if (!options) { | |
985 | ret = -ENOMEM; | |
986 | goto out; | |
987 | } | |
988 | payload = trusted_payload_alloc(key); | |
989 | if (!payload) { | |
990 | ret = -ENOMEM; | |
991 | goto out; | |
992 | } | |
993 | ||
994 | key_cmd = datablob_parse(datablob, payload, options); | |
995 | if (key_cmd < 0) { | |
996 | ret = key_cmd; | |
997 | goto out; | |
998 | } | |
999 | ||
0fe54803 JS |
1000 | if (!options->keyhandle) { |
1001 | ret = -EINVAL; | |
1002 | goto out; | |
1003 | } | |
1004 | ||
d00a1c72 MZ |
1005 | dump_payload(payload); |
1006 | dump_options(options); | |
1007 | ||
1008 | switch (key_cmd) { | |
1009 | case Opt_load: | |
0fe54803 JS |
1010 | if (tpm2) |
1011 | ret = tpm_unseal_trusted(TPM_ANY_NUM, payload, options); | |
1012 | else | |
1013 | ret = key_unseal(payload, options); | |
d00a1c72 MZ |
1014 | dump_payload(payload); |
1015 | dump_options(options); | |
1016 | if (ret < 0) | |
1017 | pr_info("trusted_key: key_unseal failed (%d)\n", ret); | |
1018 | break; | |
1019 | case Opt_new: | |
41ab999c KY |
1020 | key_len = payload->key_len; |
1021 | ret = tpm_get_random(TPM_ANY_NUM, payload->key, key_len); | |
1022 | if (ret != key_len) { | |
d00a1c72 MZ |
1023 | pr_info("trusted_key: key_create failed (%d)\n", ret); |
1024 | goto out; | |
1025 | } | |
0fe54803 JS |
1026 | if (tpm2) |
1027 | ret = tpm_seal_trusted(TPM_ANY_NUM, payload, options); | |
1028 | else | |
1029 | ret = key_seal(payload, options); | |
d00a1c72 MZ |
1030 | if (ret < 0) |
1031 | pr_info("trusted_key: key_seal failed (%d)\n", ret); | |
1032 | break; | |
1033 | default: | |
1034 | ret = -EINVAL; | |
1035 | goto out; | |
1036 | } | |
1037 | if (!ret && options->pcrlock) | |
1038 | ret = pcrlock(options->pcrlock); | |
1039 | out: | |
ee618b46 EB |
1040 | kzfree(datablob); |
1041 | kzfree(options); | |
d00a1c72 | 1042 | if (!ret) |
ee0b31a2 | 1043 | rcu_assign_keypointer(key, payload); |
d00a1c72 | 1044 | else |
ee618b46 | 1045 | kzfree(payload); |
d00a1c72 MZ |
1046 | return ret; |
1047 | } | |
1048 | ||
1049 | static void trusted_rcu_free(struct rcu_head *rcu) | |
1050 | { | |
1051 | struct trusted_key_payload *p; | |
1052 | ||
1053 | p = container_of(rcu, struct trusted_key_payload, rcu); | |
ee618b46 | 1054 | kzfree(p); |
d00a1c72 MZ |
1055 | } |
1056 | ||
1057 | /* | |
1058 | * trusted_update - reseal an existing key with new PCR values | |
1059 | */ | |
cf7f601c | 1060 | static int trusted_update(struct key *key, struct key_preparsed_payload *prep) |
d00a1c72 | 1061 | { |
096fe9ea | 1062 | struct trusted_key_payload *p; |
d00a1c72 MZ |
1063 | struct trusted_key_payload *new_p; |
1064 | struct trusted_key_options *new_o; | |
cf7f601c | 1065 | size_t datalen = prep->datalen; |
d00a1c72 MZ |
1066 | char *datablob; |
1067 | int ret = 0; | |
1068 | ||
363b02da | 1069 | if (key_is_negative(key)) |
096fe9ea DH |
1070 | return -ENOKEY; |
1071 | p = key->payload.data[0]; | |
d00a1c72 MZ |
1072 | if (!p->migratable) |
1073 | return -EPERM; | |
cf7f601c | 1074 | if (datalen <= 0 || datalen > 32767 || !prep->data) |
d00a1c72 MZ |
1075 | return -EINVAL; |
1076 | ||
1077 | datablob = kmalloc(datalen + 1, GFP_KERNEL); | |
1078 | if (!datablob) | |
1079 | return -ENOMEM; | |
1080 | new_o = trusted_options_alloc(); | |
1081 | if (!new_o) { | |
1082 | ret = -ENOMEM; | |
1083 | goto out; | |
1084 | } | |
1085 | new_p = trusted_payload_alloc(key); | |
1086 | if (!new_p) { | |
1087 | ret = -ENOMEM; | |
1088 | goto out; | |
1089 | } | |
1090 | ||
cf7f601c | 1091 | memcpy(datablob, prep->data, datalen); |
d00a1c72 MZ |
1092 | datablob[datalen] = '\0'; |
1093 | ret = datablob_parse(datablob, new_p, new_o); | |
1094 | if (ret != Opt_update) { | |
1095 | ret = -EINVAL; | |
ee618b46 | 1096 | kzfree(new_p); |
d00a1c72 MZ |
1097 | goto out; |
1098 | } | |
0fe54803 JS |
1099 | |
1100 | if (!new_o->keyhandle) { | |
1101 | ret = -EINVAL; | |
ee618b46 | 1102 | kzfree(new_p); |
0fe54803 JS |
1103 | goto out; |
1104 | } | |
1105 | ||
d00a1c72 MZ |
1106 | /* copy old key values, and reseal with new pcrs */ |
1107 | new_p->migratable = p->migratable; | |
1108 | new_p->key_len = p->key_len; | |
1109 | memcpy(new_p->key, p->key, p->key_len); | |
1110 | dump_payload(p); | |
1111 | dump_payload(new_p); | |
1112 | ||
1113 | ret = key_seal(new_p, new_o); | |
1114 | if (ret < 0) { | |
1115 | pr_info("trusted_key: key_seal failed (%d)\n", ret); | |
ee618b46 | 1116 | kzfree(new_p); |
d00a1c72 MZ |
1117 | goto out; |
1118 | } | |
1119 | if (new_o->pcrlock) { | |
1120 | ret = pcrlock(new_o->pcrlock); | |
1121 | if (ret < 0) { | |
1122 | pr_info("trusted_key: pcrlock failed (%d)\n", ret); | |
ee618b46 | 1123 | kzfree(new_p); |
d00a1c72 MZ |
1124 | goto out; |
1125 | } | |
1126 | } | |
ee0b31a2 | 1127 | rcu_assign_keypointer(key, new_p); |
d00a1c72 MZ |
1128 | call_rcu(&p->rcu, trusted_rcu_free); |
1129 | out: | |
ee618b46 EB |
1130 | kzfree(datablob); |
1131 | kzfree(new_o); | |
d00a1c72 MZ |
1132 | return ret; |
1133 | } | |
1134 | ||
1135 | /* | |
1136 | * trusted_read - copy the sealed blob data to userspace in hex. | |
1137 | * On success, return to userspace the trusted key datablob size. | |
1138 | */ | |
1139 | static long trusted_read(const struct key *key, char __user *buffer, | |
1140 | size_t buflen) | |
1141 | { | |
0837e49a | 1142 | const struct trusted_key_payload *p; |
d00a1c72 MZ |
1143 | char *ascii_buf; |
1144 | char *bufp; | |
1145 | int i; | |
1146 | ||
0837e49a | 1147 | p = dereference_key_locked(key); |
d00a1c72 MZ |
1148 | if (!p) |
1149 | return -EINVAL; | |
d00a1c72 | 1150 | |
a3c812f7 EB |
1151 | if (buffer && buflen >= 2 * p->blob_len) { |
1152 | ascii_buf = kmalloc(2 * p->blob_len, GFP_KERNEL); | |
1153 | if (!ascii_buf) | |
1154 | return -ENOMEM; | |
1155 | ||
1156 | bufp = ascii_buf; | |
1157 | for (i = 0; i < p->blob_len; i++) | |
1158 | bufp = hex_byte_pack(bufp, p->blob[i]); | |
1159 | if (copy_to_user(buffer, ascii_buf, 2 * p->blob_len) != 0) { | |
1160 | kzfree(ascii_buf); | |
1161 | return -EFAULT; | |
1162 | } | |
ee618b46 | 1163 | kzfree(ascii_buf); |
d00a1c72 | 1164 | } |
d00a1c72 MZ |
1165 | return 2 * p->blob_len; |
1166 | } | |
1167 | ||
1168 | /* | |
ee618b46 | 1169 | * trusted_destroy - clear and free the key's payload |
d00a1c72 MZ |
1170 | */ |
1171 | static void trusted_destroy(struct key *key) | |
1172 | { | |
ee618b46 | 1173 | kzfree(key->payload.data[0]); |
d00a1c72 MZ |
1174 | } |
1175 | ||
1176 | struct key_type key_type_trusted = { | |
1177 | .name = "trusted", | |
1178 | .instantiate = trusted_instantiate, | |
1179 | .update = trusted_update, | |
d00a1c72 MZ |
1180 | .destroy = trusted_destroy, |
1181 | .describe = user_describe, | |
1182 | .read = trusted_read, | |
1183 | }; | |
1184 | ||
1185 | EXPORT_SYMBOL_GPL(key_type_trusted); | |
1186 | ||
1187 | static void trusted_shash_release(void) | |
1188 | { | |
1189 | if (hashalg) | |
1190 | crypto_free_shash(hashalg); | |
1191 | if (hmacalg) | |
1192 | crypto_free_shash(hmacalg); | |
1193 | } | |
1194 | ||
1195 | static int __init trusted_shash_alloc(void) | |
1196 | { | |
1197 | int ret; | |
1198 | ||
1199 | hmacalg = crypto_alloc_shash(hmac_alg, 0, CRYPTO_ALG_ASYNC); | |
1200 | if (IS_ERR(hmacalg)) { | |
1201 | pr_info("trusted_key: could not allocate crypto %s\n", | |
1202 | hmac_alg); | |
1203 | return PTR_ERR(hmacalg); | |
1204 | } | |
1205 | ||
1206 | hashalg = crypto_alloc_shash(hash_alg, 0, CRYPTO_ALG_ASYNC); | |
1207 | if (IS_ERR(hashalg)) { | |
1208 | pr_info("trusted_key: could not allocate crypto %s\n", | |
1209 | hash_alg); | |
1210 | ret = PTR_ERR(hashalg); | |
1211 | goto hashalg_fail; | |
1212 | } | |
1213 | ||
1214 | return 0; | |
1215 | ||
1216 | hashalg_fail: | |
1217 | crypto_free_shash(hmacalg); | |
1218 | return ret; | |
1219 | } | |
1220 | ||
1221 | static int __init init_trusted(void) | |
1222 | { | |
1223 | int ret; | |
1224 | ||
1225 | ret = trusted_shash_alloc(); | |
1226 | if (ret < 0) | |
1227 | return ret; | |
1228 | ret = register_key_type(&key_type_trusted); | |
1229 | if (ret < 0) | |
1230 | trusted_shash_release(); | |
1231 | return ret; | |
1232 | } | |
1233 | ||
1234 | static void __exit cleanup_trusted(void) | |
1235 | { | |
1236 | trusted_shash_release(); | |
1237 | unregister_key_type(&key_type_trusted); | |
1238 | } | |
1239 | ||
1240 | late_initcall(init_trusted); | |
1241 | module_exit(cleanup_trusted); | |
1242 | ||
1243 | MODULE_LICENSE("GPL"); |