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Linux 4.8-rc8
[linux/fpc-iii.git] / drivers / char / tpm / tpm2-cmd.c
blob0c75c3f1689fc2a053daeaab7f6e862f451c331b
1 /*
2 * Copyright (C) 2014, 2015 Intel Corporation
3 *
4 * Authors:
5 * Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
6 *
7 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
8 *
9 * This file contains TPM2 protocol implementations of the commands
10 * used by the kernel internally.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; version 2
15 * of the License.
16 */
17
18 #include "tpm.h"
19 #include <crypto/hash_info.h>
20 #include <keys/trusted-type.h>
21
22 enum tpm2_object_attributes {
23 TPM2_OA_USER_WITH_AUTH = BIT(6),
24 };
25
26 enum tpm2_session_attributes {
27 TPM2_SA_CONTINUE_SESSION = BIT(0),
28 };
29
30 struct tpm2_startup_in {
31 __be16 startup_type;
32 } __packed;
33
34 struct tpm2_self_test_in {
35 u8 full_test;
36 } __packed;
37
38 struct tpm2_pcr_read_in {
39 __be32 pcr_selects_cnt;
40 __be16 hash_alg;
41 u8 pcr_select_size;
42 u8 pcr_select[TPM2_PCR_SELECT_MIN];
43 } __packed;
44
45 struct tpm2_pcr_read_out {
46 __be32 update_cnt;
47 __be32 pcr_selects_cnt;
48 __be16 hash_alg;
49 u8 pcr_select_size;
50 u8 pcr_select[TPM2_PCR_SELECT_MIN];
51 __be32 digests_cnt;
52 __be16 digest_size;
53 u8 digest[TPM_DIGEST_SIZE];
54 } __packed;
55
56 struct tpm2_null_auth_area {
57 __be32 handle;
58 __be16 nonce_size;
59 u8 attributes;
60 __be16 auth_size;
61 } __packed;
62
63 struct tpm2_pcr_extend_in {
64 __be32 pcr_idx;
65 __be32 auth_area_size;
66 struct tpm2_null_auth_area auth_area;
67 __be32 digest_cnt;
68 __be16 hash_alg;
69 u8 digest[TPM_DIGEST_SIZE];
70 } __packed;
71
72 struct tpm2_get_tpm_pt_in {
73 __be32 cap_id;
74 __be32 property_id;
75 __be32 property_cnt;
76 } __packed;
77
78 struct tpm2_get_tpm_pt_out {
79 u8 more_data;
80 __be32 subcap_id;
81 __be32 property_cnt;
82 __be32 property_id;
83 __be32 value;
84 } __packed;
85
86 struct tpm2_get_random_in {
87 __be16 size;
88 } __packed;
89
90 struct tpm2_get_random_out {
91 __be16 size;
92 u8 buffer[TPM_MAX_RNG_DATA];
93 } __packed;
94
95 union tpm2_cmd_params {
96 struct tpm2_startup_in startup_in;
97 struct tpm2_self_test_in selftest_in;
98 struct tpm2_pcr_read_in pcrread_in;
99 struct tpm2_pcr_read_out pcrread_out;
100 struct tpm2_pcr_extend_in pcrextend_in;
101 struct tpm2_get_tpm_pt_in get_tpm_pt_in;
102 struct tpm2_get_tpm_pt_out get_tpm_pt_out;
103 struct tpm2_get_random_in getrandom_in;
104 struct tpm2_get_random_out getrandom_out;
105 };
106
107 struct tpm2_cmd {
108 tpm_cmd_header header;
109 union tpm2_cmd_params params;
110 } __packed;
111
112 struct tpm2_hash {
113 unsigned int crypto_id;
114 unsigned int tpm_id;
115 };
116
117 static struct tpm2_hash tpm2_hash_map[] = {
118 {HASH_ALGO_SHA1, TPM2_ALG_SHA1},
119 {HASH_ALGO_SHA256, TPM2_ALG_SHA256},
120 {HASH_ALGO_SHA384, TPM2_ALG_SHA384},
121 {HASH_ALGO_SHA512, TPM2_ALG_SHA512},
122 {HASH_ALGO_SM3_256, TPM2_ALG_SM3_256},
123 };
124
125 /*
126 * Array with one entry per ordinal defining the maximum amount
127 * of time the chip could take to return the result. The values
128 * of the SHORT, MEDIUM, and LONG durations are taken from the
129 * PC Client Profile (PTP) specification.
130 */
131 static const u8 tpm2_ordinal_duration[TPM2_CC_LAST - TPM2_CC_FIRST + 1] = {
132 TPM_UNDEFINED, /* 11F */
133 TPM_UNDEFINED, /* 120 */
134 TPM_LONG, /* 121 */
135 TPM_UNDEFINED, /* 122 */
136 TPM_UNDEFINED, /* 123 */
137 TPM_UNDEFINED, /* 124 */
138 TPM_UNDEFINED, /* 125 */
139 TPM_UNDEFINED, /* 126 */
140 TPM_UNDEFINED, /* 127 */
141 TPM_UNDEFINED, /* 128 */
142 TPM_LONG, /* 129 */
143 TPM_UNDEFINED, /* 12a */
144 TPM_UNDEFINED, /* 12b */
145 TPM_UNDEFINED, /* 12c */
146 TPM_UNDEFINED, /* 12d */
147 TPM_UNDEFINED, /* 12e */
148 TPM_UNDEFINED, /* 12f */
149 TPM_UNDEFINED, /* 130 */
150 TPM_UNDEFINED, /* 131 */
151 TPM_UNDEFINED, /* 132 */
152 TPM_UNDEFINED, /* 133 */
153 TPM_UNDEFINED, /* 134 */
154 TPM_UNDEFINED, /* 135 */
155 TPM_UNDEFINED, /* 136 */
156 TPM_UNDEFINED, /* 137 */
157 TPM_UNDEFINED, /* 138 */
158 TPM_UNDEFINED, /* 139 */
159 TPM_UNDEFINED, /* 13a */
160 TPM_UNDEFINED, /* 13b */
161 TPM_UNDEFINED, /* 13c */
162 TPM_UNDEFINED, /* 13d */
163 TPM_MEDIUM, /* 13e */
164 TPM_UNDEFINED, /* 13f */
165 TPM_UNDEFINED, /* 140 */
166 TPM_UNDEFINED, /* 141 */
167 TPM_UNDEFINED, /* 142 */
168 TPM_LONG, /* 143 */
169 TPM_MEDIUM, /* 144 */
170 TPM_UNDEFINED, /* 145 */
171 TPM_UNDEFINED, /* 146 */
172 TPM_UNDEFINED, /* 147 */
173 TPM_UNDEFINED, /* 148 */
174 TPM_UNDEFINED, /* 149 */
175 TPM_UNDEFINED, /* 14a */
176 TPM_UNDEFINED, /* 14b */
177 TPM_UNDEFINED, /* 14c */
178 TPM_UNDEFINED, /* 14d */
179 TPM_LONG, /* 14e */
180 TPM_UNDEFINED, /* 14f */
181 TPM_UNDEFINED, /* 150 */
182 TPM_UNDEFINED, /* 151 */
183 TPM_UNDEFINED, /* 152 */
184 TPM_UNDEFINED, /* 153 */
185 TPM_UNDEFINED, /* 154 */
186 TPM_UNDEFINED, /* 155 */
187 TPM_UNDEFINED, /* 156 */
188 TPM_UNDEFINED, /* 157 */
189 TPM_UNDEFINED, /* 158 */
190 TPM_UNDEFINED, /* 159 */
191 TPM_UNDEFINED, /* 15a */
192 TPM_UNDEFINED, /* 15b */
193 TPM_MEDIUM, /* 15c */
194 TPM_UNDEFINED, /* 15d */
195 TPM_UNDEFINED, /* 15e */
196 TPM_UNDEFINED, /* 15f */
197 TPM_UNDEFINED, /* 160 */
198 TPM_UNDEFINED, /* 161 */
199 TPM_UNDEFINED, /* 162 */
200 TPM_UNDEFINED, /* 163 */
201 TPM_UNDEFINED, /* 164 */
202 TPM_UNDEFINED, /* 165 */
203 TPM_UNDEFINED, /* 166 */
204 TPM_UNDEFINED, /* 167 */
205 TPM_UNDEFINED, /* 168 */
206 TPM_UNDEFINED, /* 169 */
207 TPM_UNDEFINED, /* 16a */
208 TPM_UNDEFINED, /* 16b */
209 TPM_UNDEFINED, /* 16c */
210 TPM_UNDEFINED, /* 16d */
211 TPM_UNDEFINED, /* 16e */
212 TPM_UNDEFINED, /* 16f */
213 TPM_UNDEFINED, /* 170 */
214 TPM_UNDEFINED, /* 171 */
215 TPM_UNDEFINED, /* 172 */
216 TPM_UNDEFINED, /* 173 */
217 TPM_UNDEFINED, /* 174 */
218 TPM_UNDEFINED, /* 175 */
219 TPM_UNDEFINED, /* 176 */
220 TPM_LONG, /* 177 */
221 TPM_UNDEFINED, /* 178 */
222 TPM_UNDEFINED, /* 179 */
223 TPM_MEDIUM, /* 17a */
224 TPM_LONG, /* 17b */
225 TPM_UNDEFINED, /* 17c */
226 TPM_UNDEFINED, /* 17d */
227 TPM_UNDEFINED, /* 17e */
228 TPM_UNDEFINED, /* 17f */
229 TPM_UNDEFINED, /* 180 */
230 TPM_UNDEFINED, /* 181 */
231 TPM_MEDIUM, /* 182 */
232 TPM_UNDEFINED, /* 183 */
233 TPM_UNDEFINED, /* 184 */
234 TPM_MEDIUM, /* 185 */
235 TPM_MEDIUM, /* 186 */
236 TPM_UNDEFINED, /* 187 */
237 TPM_UNDEFINED, /* 188 */
238 TPM_UNDEFINED, /* 189 */
239 TPM_UNDEFINED, /* 18a */
240 TPM_UNDEFINED, /* 18b */
241 TPM_UNDEFINED, /* 18c */
242 TPM_UNDEFINED, /* 18d */
243 TPM_UNDEFINED, /* 18e */
244 TPM_UNDEFINED /* 18f */
245 };
246
247 #define TPM2_PCR_READ_IN_SIZE \
248 (sizeof(struct tpm_input_header) + \
249 sizeof(struct tpm2_pcr_read_in))
250
251 static const struct tpm_input_header tpm2_pcrread_header = {
252 .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
253 .length = cpu_to_be32(TPM2_PCR_READ_IN_SIZE),
254 .ordinal = cpu_to_be32(TPM2_CC_PCR_READ)
255 };
256
257 /**
258 * tpm2_pcr_read() - read a PCR value
259 * @chip: TPM chip to use.
260 * @pcr_idx: index of the PCR to read.
261 * @ref_buf: buffer to store the resulting hash,
262 *
263 * 0 is returned when the operation is successful. If a negative number is
264 * returned it remarks a POSIX error code. If a positive number is returned
265 * it remarks a TPM error.
266 */
267 int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
268 {
269 int rc;
270 struct tpm2_cmd cmd;
271 u8 *buf;
272
273 if (pcr_idx >= TPM2_PLATFORM_PCR)
274 return -EINVAL;
275
276 cmd.header.in = tpm2_pcrread_header;
277 cmd.params.pcrread_in.pcr_selects_cnt = cpu_to_be32(1);
278 cmd.params.pcrread_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
279 cmd.params.pcrread_in.pcr_select_size = TPM2_PCR_SELECT_MIN;
280
281 memset(cmd.params.pcrread_in.pcr_select, 0,
282 sizeof(cmd.params.pcrread_in.pcr_select));
283 cmd.params.pcrread_in.pcr_select[pcr_idx >> 3] = 1 << (pcr_idx & 0x7);
284
285 rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
286 "attempting to read a pcr value");
287 if (rc == 0) {
288 buf = cmd.params.pcrread_out.digest;
289 memcpy(res_buf, buf, TPM_DIGEST_SIZE);
290 }
291
292 return rc;
293 }
294
295 #define TPM2_GET_PCREXTEND_IN_SIZE \
296 (sizeof(struct tpm_input_header) + \
297 sizeof(struct tpm2_pcr_extend_in))
298
299 static const struct tpm_input_header tpm2_pcrextend_header = {
300 .tag = cpu_to_be16(TPM2_ST_SESSIONS),
301 .length = cpu_to_be32(TPM2_GET_PCREXTEND_IN_SIZE),
302 .ordinal = cpu_to_be32(TPM2_CC_PCR_EXTEND)
303 };
304
305 /**
306 * tpm2_pcr_extend() - extend a PCR value
307 * @chip: TPM chip to use.
308 * @pcr_idx: index of the PCR.
309 * @hash: hash value to use for the extend operation.
310 *
311 * 0 is returned when the operation is successful. If a negative number is
312 * returned it remarks a POSIX error code. If a positive number is returned
313 * it remarks a TPM error.
314 */
315 int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash)
316 {
317 struct tpm2_cmd cmd;
318 int rc;
319
320 cmd.header.in = tpm2_pcrextend_header;
321 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
322 cmd.params.pcrextend_in.auth_area_size =
323 cpu_to_be32(sizeof(struct tpm2_null_auth_area));
324 cmd.params.pcrextend_in.auth_area.handle =
325 cpu_to_be32(TPM2_RS_PW);
326 cmd.params.pcrextend_in.auth_area.nonce_size = 0;
327 cmd.params.pcrextend_in.auth_area.attributes = 0;
328 cmd.params.pcrextend_in.auth_area.auth_size = 0;
329 cmd.params.pcrextend_in.digest_cnt = cpu_to_be32(1);
330 cmd.params.pcrextend_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
331 memcpy(cmd.params.pcrextend_in.digest, hash, TPM_DIGEST_SIZE);
332
333 rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
334 "attempting extend a PCR value");
335
336 return rc;
337 }
338
339 #define TPM2_GETRANDOM_IN_SIZE \
340 (sizeof(struct tpm_input_header) + \
341 sizeof(struct tpm2_get_random_in))
342
343 static const struct tpm_input_header tpm2_getrandom_header = {
344 .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
345 .length = cpu_to_be32(TPM2_GETRANDOM_IN_SIZE),
346 .ordinal = cpu_to_be32(TPM2_CC_GET_RANDOM)
347 };
348
349 /**
350 * tpm2_get_random() - get random bytes from the TPM RNG
351 * @chip: TPM chip to use
352 * @out: destination buffer for the random bytes
353 * @max: the max number of bytes to write to @out
354 *
355 * 0 is returned when the operation is successful. If a negative number is
356 * returned it remarks a POSIX error code. If a positive number is returned
357 * it remarks a TPM error.
358 */
359 int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max)
360 {
361 struct tpm2_cmd cmd;
362 u32 recd;
363 u32 num_bytes;
364 int err;
365 int total = 0;
366 int retries = 5;
367 u8 *dest = out;
368
369 num_bytes = min_t(u32, max, sizeof(cmd.params.getrandom_out.buffer));
370
371 if (!out || !num_bytes ||
372 max > sizeof(cmd.params.getrandom_out.buffer))
373 return -EINVAL;
374
375 do {
376 cmd.header.in = tpm2_getrandom_header;
377 cmd.params.getrandom_in.size = cpu_to_be16(num_bytes);
378
379 err = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
380 "attempting get random");
381 if (err)
382 break;
383
384 recd = min_t(u32, be16_to_cpu(cmd.params.getrandom_out.size),
385 num_bytes);
386 memcpy(dest, cmd.params.getrandom_out.buffer, recd);
387
388 dest += recd;
389 total += recd;
390 num_bytes -= recd;
391 } while (retries-- && total < max);
392
393 return total ? total : -EIO;
394 }
395
396 #define TPM2_GET_TPM_PT_IN_SIZE \
397 (sizeof(struct tpm_input_header) + \
398 sizeof(struct tpm2_get_tpm_pt_in))
399
400 static const struct tpm_input_header tpm2_get_tpm_pt_header = {
401 .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
402 .length = cpu_to_be32(TPM2_GET_TPM_PT_IN_SIZE),
403 .ordinal = cpu_to_be32(TPM2_CC_GET_CAPABILITY)
404 };
405
406 /**
407 * Append TPMS_AUTH_COMMAND to the buffer. The buffer must be allocated with
408 * tpm_buf_alloc().
409 *
410 * @param buf: an allocated tpm_buf instance
411 * @param nonce: the session nonce, may be NULL if not used
412 * @param nonce_len: the session nonce length, may be 0 if not used
413 * @param attributes: the session attributes
414 * @param hmac: the session HMAC or password, may be NULL if not used
415 * @param hmac_len: the session HMAC or password length, maybe 0 if not used
416 */
417 static void tpm2_buf_append_auth(struct tpm_buf *buf, u32 session_handle,
418 const u8 *nonce, u16 nonce_len,
419 u8 attributes,
420 const u8 *hmac, u16 hmac_len)
421 {
422 tpm_buf_append_u32(buf, 9 + nonce_len + hmac_len);
423 tpm_buf_append_u32(buf, session_handle);
424 tpm_buf_append_u16(buf, nonce_len);
425
426 if (nonce && nonce_len)
427 tpm_buf_append(buf, nonce, nonce_len);
428
429 tpm_buf_append_u8(buf, attributes);
430 tpm_buf_append_u16(buf, hmac_len);
431
432 if (hmac && hmac_len)
433 tpm_buf_append(buf, hmac, hmac_len);
434 }
435
436 /**
437 * tpm2_seal_trusted() - seal a trusted key
438 * @chip_num: A specific chip number for the request or TPM_ANY_NUM
439 * @options: authentication values and other options
440 * @payload: the key data in clear and encrypted form
441 *
442 * Returns < 0 on error and 0 on success.
443 */
444 int tpm2_seal_trusted(struct tpm_chip *chip,
445 struct trusted_key_payload *payload,
446 struct trusted_key_options *options)
447 {
448 unsigned int blob_len;
449 struct tpm_buf buf;
450 u32 hash;
451 int i;
452 int rc;
453
454 for (i = 0; i < ARRAY_SIZE(tpm2_hash_map); i++) {
455 if (options->hash == tpm2_hash_map[i].crypto_id) {
456 hash = tpm2_hash_map[i].tpm_id;
457 break;
458 }
459 }
460
461 if (i == ARRAY_SIZE(tpm2_hash_map))
462 return -EINVAL;
463
464 rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_CREATE);
465 if (rc)
466 return rc;
467
468 tpm_buf_append_u32(&buf, options->keyhandle);
469 tpm2_buf_append_auth(&buf, TPM2_RS_PW,
470 NULL /* nonce */, 0,
471 0 /* session_attributes */,
472 options->keyauth /* hmac */,
473 TPM_DIGEST_SIZE);
474
475 /* sensitive */
476 tpm_buf_append_u16(&buf, 4 + TPM_DIGEST_SIZE + payload->key_len + 1);
477
478 tpm_buf_append_u16(&buf, TPM_DIGEST_SIZE);
479 tpm_buf_append(&buf, options->blobauth, TPM_DIGEST_SIZE);
480 tpm_buf_append_u16(&buf, payload->key_len + 1);
481 tpm_buf_append(&buf, payload->key, payload->key_len);
482 tpm_buf_append_u8(&buf, payload->migratable);
483
484 /* public */
485 tpm_buf_append_u16(&buf, 14 + options->policydigest_len);
486 tpm_buf_append_u16(&buf, TPM2_ALG_KEYEDHASH);
487 tpm_buf_append_u16(&buf, hash);
488
489 /* policy */
490 if (options->policydigest_len) {
491 tpm_buf_append_u32(&buf, 0);
492 tpm_buf_append_u16(&buf, options->policydigest_len);
493 tpm_buf_append(&buf, options->policydigest,
494 options->policydigest_len);
495 } else {
496 tpm_buf_append_u32(&buf, TPM2_OA_USER_WITH_AUTH);
497 tpm_buf_append_u16(&buf, 0);
498 }
499
500 /* public parameters */
501 tpm_buf_append_u16(&buf, TPM2_ALG_NULL);
502 tpm_buf_append_u16(&buf, 0);
503
504 /* outside info */
505 tpm_buf_append_u16(&buf, 0);
506
507 /* creation PCR */
508 tpm_buf_append_u32(&buf, 0);
509
510 if (buf.flags & TPM_BUF_OVERFLOW) {
511 rc = -E2BIG;
512 goto out;
513 }
514
515 rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, "sealing data");
516 if (rc)
517 goto out;
518
519 blob_len = be32_to_cpup((__be32 *) &buf.data[TPM_HEADER_SIZE]);
520 if (blob_len > MAX_BLOB_SIZE) {
521 rc = -E2BIG;
522 goto out;
523 }
524
525 memcpy(payload->blob, &buf.data[TPM_HEADER_SIZE + 4], blob_len);
526 payload->blob_len = blob_len;
527
528 out:
529 tpm_buf_destroy(&buf);
530
531 if (rc > 0) {
532 if ((rc & TPM2_RC_HASH) == TPM2_RC_HASH)
533 rc = -EINVAL;
534 else
535 rc = -EPERM;
536 }
537
538 return rc;
539 }
540
541 static int tpm2_load(struct tpm_chip *chip,
542 struct trusted_key_payload *payload,
543 struct trusted_key_options *options,
544 u32 *blob_handle)
545 {
546 struct tpm_buf buf;
547 unsigned int private_len;
548 unsigned int public_len;
549 unsigned int blob_len;
550 int rc;
551
552 private_len = be16_to_cpup((__be16 *) &payload->blob[0]);
553 if (private_len > (payload->blob_len - 2))
554 return -E2BIG;
555
556 public_len = be16_to_cpup((__be16 *) &payload->blob[2 + private_len]);
557 blob_len = private_len + public_len + 4;
558 if (blob_len > payload->blob_len)
559 return -E2BIG;
560
561 rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_LOAD);
562 if (rc)
563 return rc;
564
565 tpm_buf_append_u32(&buf, options->keyhandle);
566 tpm2_buf_append_auth(&buf, TPM2_RS_PW,
567 NULL /* nonce */, 0,
568 0 /* session_attributes */,
569 options->keyauth /* hmac */,
570 TPM_DIGEST_SIZE);
571
572 tpm_buf_append(&buf, payload->blob, blob_len);
573
574 if (buf.flags & TPM_BUF_OVERFLOW) {
575 rc = -E2BIG;
576 goto out;
577 }
578
579 rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, "loading blob");
580 if (!rc)
581 *blob_handle = be32_to_cpup(
582 (__be32 *) &buf.data[TPM_HEADER_SIZE]);
583
584 out:
585 tpm_buf_destroy(&buf);
586
587 if (rc > 0)
588 rc = -EPERM;
589
590 return rc;
591 }
592
593 static void tpm2_flush_context(struct tpm_chip *chip, u32 handle)
594 {
595 struct tpm_buf buf;
596 int rc;
597
598 rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_FLUSH_CONTEXT);
599 if (rc) {
600 dev_warn(&chip->dev, "0x%08x was not flushed, out of memory\n",
601 handle);
602 return;
603 }
604
605 tpm_buf_append_u32(&buf, handle);
606
607 rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, "flushing context");
608 if (rc)
609 dev_warn(&chip->dev, "0x%08x was not flushed, rc=%d\n", handle,
610 rc);
611
612 tpm_buf_destroy(&buf);
613 }
614
615 static int tpm2_unseal(struct tpm_chip *chip,
616 struct trusted_key_payload *payload,
617 struct trusted_key_options *options,
618 u32 blob_handle)
619 {
620 struct tpm_buf buf;
621 u16 data_len;
622 u8 *data;
623 int rc;
624
625 rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_UNSEAL);
626 if (rc)
627 return rc;
628
629 tpm_buf_append_u32(&buf, blob_handle);
630 tpm2_buf_append_auth(&buf,
631 options->policyhandle ?
632 options->policyhandle : TPM2_RS_PW,
633 NULL /* nonce */, 0,
634 TPM2_SA_CONTINUE_SESSION,
635 options->blobauth /* hmac */,
636 TPM_DIGEST_SIZE);
637
638 rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, "unsealing");
639 if (rc > 0)
640 rc = -EPERM;
641
642 if (!rc) {
643 data_len = be16_to_cpup(
644 (__be16 *) &buf.data[TPM_HEADER_SIZE + 4]);
645 data = &buf.data[TPM_HEADER_SIZE + 6];
646
647 memcpy(payload->key, data, data_len - 1);
648 payload->key_len = data_len - 1;
649 payload->migratable = data[data_len - 1];
650 }
651
652 tpm_buf_destroy(&buf);
653 return rc;
654 }
655
656 /**
657 * tpm_unseal_trusted() - unseal a trusted key
658 * @chip_num: A specific chip number for the request or TPM_ANY_NUM
659 * @options: authentication values and other options
660 * @payload: the key data in clear and encrypted form
661 *
662 * Returns < 0 on error and 0 on success.
663 */
664 int tpm2_unseal_trusted(struct tpm_chip *chip,
665 struct trusted_key_payload *payload,
666 struct trusted_key_options *options)
667 {
668 u32 blob_handle;
669 int rc;
670
671 rc = tpm2_load(chip, payload, options, &blob_handle);
672 if (rc)
673 return rc;
674
675 rc = tpm2_unseal(chip, payload, options, blob_handle);
676
677 tpm2_flush_context(chip, blob_handle);
678
679 return rc;
680 }
681
682 /**
683 * tpm2_get_tpm_pt() - get value of a TPM_CAP_TPM_PROPERTIES type property
684 * @chip: TPM chip to use.
685 * @property_id: property ID.
686 * @value: output variable.
687 * @desc: passed to tpm_transmit_cmd()
688 *
689 * 0 is returned when the operation is successful. If a negative number is
690 * returned it remarks a POSIX error code. If a positive number is returned
691 * it remarks a TPM error.
692 */
693 ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value,
694 const char *desc)
695 {
696 struct tpm2_cmd cmd;
697 int rc;
698
699 cmd.header.in = tpm2_get_tpm_pt_header;
700 cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES);
701 cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(property_id);
702 cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1);
703
704 rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), desc);
705 if (!rc)
706 *value = be32_to_cpu(cmd.params.get_tpm_pt_out.value);
707
708 return rc;
709 }
710
711 #define TPM2_STARTUP_IN_SIZE \
712 (sizeof(struct tpm_input_header) + \
713 sizeof(struct tpm2_startup_in))
714
715 static const struct tpm_input_header tpm2_startup_header = {
716 .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
717 .length = cpu_to_be32(TPM2_STARTUP_IN_SIZE),
718 .ordinal = cpu_to_be32(TPM2_CC_STARTUP)
719 };
720
721 /**
722 * tpm2_startup() - send startup command to the TPM chip
723 * @chip: TPM chip to use.
724 * @startup_type startup type. The value is either
725 * TPM_SU_CLEAR or TPM_SU_STATE.
726 *
727 * 0 is returned when the operation is successful. If a negative number is
728 * returned it remarks a POSIX error code. If a positive number is returned
729 * it remarks a TPM error.
730 */
731 static int tpm2_startup(struct tpm_chip *chip, u16 startup_type)
732 {
733 struct tpm2_cmd cmd;
734
735 cmd.header.in = tpm2_startup_header;
736
737 cmd.params.startup_in.startup_type = cpu_to_be16(startup_type);
738 return tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
739 "attempting to start the TPM");
740 }
741
742 #define TPM2_SHUTDOWN_IN_SIZE \
743 (sizeof(struct tpm_input_header) + \
744 sizeof(struct tpm2_startup_in))
745
746 static const struct tpm_input_header tpm2_shutdown_header = {
747 .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
748 .length = cpu_to_be32(TPM2_SHUTDOWN_IN_SIZE),
749 .ordinal = cpu_to_be32(TPM2_CC_SHUTDOWN)
750 };
751
752 /**
753 * tpm2_shutdown() - send shutdown command to the TPM chip
754 * @chip: TPM chip to use.
755 * @shutdown_type shutdown type. The value is either
756 * TPM_SU_CLEAR or TPM_SU_STATE.
757 */
758 void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type)
759 {
760 struct tpm2_cmd cmd;
761 int rc;
762
763 cmd.header.in = tpm2_shutdown_header;
764 cmd.params.startup_in.startup_type = cpu_to_be16(shutdown_type);
765
766 rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), "stopping the TPM");
767
768 /* In places where shutdown command is sent there's no much we can do
769 * except print the error code on a system failure.
770 */
771 if (rc < 0)
772 dev_warn(&chip->dev, "transmit returned %d while stopping the TPM",
773 rc);
774 }
775
776 /*
777 * tpm2_calc_ordinal_duration() - maximum duration for a command
778 * @chip: TPM chip to use.
779 * @ordinal: command code number.
780 *
781 * 0 is returned when the operation is successful. If a negative number is
782 * returned it remarks a POSIX error code. If a positive number is returned
783 * it remarks a TPM error.
784 */
785 unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
786 {
787 int index = TPM_UNDEFINED;
788 int duration = 0;
789
790 if (ordinal >= TPM2_CC_FIRST && ordinal <= TPM2_CC_LAST)
791 index = tpm2_ordinal_duration[ordinal - TPM2_CC_FIRST];
792
793 if (index != TPM_UNDEFINED)
794 duration = chip->duration[index];
795
796 if (duration <= 0)
797 duration = 2 * 60 * HZ;
798
799 return duration;
800 }
801 EXPORT_SYMBOL_GPL(tpm2_calc_ordinal_duration);
802
803 #define TPM2_SELF_TEST_IN_SIZE \
804 (sizeof(struct tpm_input_header) + \
805 sizeof(struct tpm2_self_test_in))
806
807 static const struct tpm_input_header tpm2_selftest_header = {
808 .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
809 .length = cpu_to_be32(TPM2_SELF_TEST_IN_SIZE),
810 .ordinal = cpu_to_be32(TPM2_CC_SELF_TEST)
811 };
812
813 /**
814 * tpm2_continue_selftest() - start a self test
815 * @chip: TPM chip to use
816 * @full: test all commands instead of testing only those that were not
817 * previously tested.
818 *
819 * 0 is returned when the operation is successful. If a negative number is
820 * returned it remarks a POSIX error code. If a positive number is returned
821 * it remarks a TPM error.
822 */
823 static int tpm2_start_selftest(struct tpm_chip *chip, bool full)
824 {
825 int rc;
826 struct tpm2_cmd cmd;
827
828 cmd.header.in = tpm2_selftest_header;
829 cmd.params.selftest_in.full_test = full;
830
831 rc = tpm_transmit_cmd(chip, &cmd, TPM2_SELF_TEST_IN_SIZE,
832 "continue selftest");
833
834 /* At least some prototype chips seem to give RC_TESTING error
835 * immediately. This is a workaround for that.
836 */
837 if (rc == TPM2_RC_TESTING) {
838 dev_warn(&chip->dev, "Got RC_TESTING, ignoring\n");
839 rc = 0;
840 }
841
842 return rc;
843 }
844
845 /**
846 * tpm2_do_selftest() - run a full self test
847 * @chip: TPM chip to use
848 *
849 * During the self test TPM2 commands return with the error code RC_TESTING.
850 * Waiting is done by issuing PCR read until it executes successfully.
851 *
852 * 0 is returned when the operation is successful. If a negative number is
853 * returned it remarks a POSIX error code. If a positive number is returned
854 * it remarks a TPM error.
855 */
856 static int tpm2_do_selftest(struct tpm_chip *chip)
857 {
858 int rc;
859 unsigned int loops;
860 unsigned int delay_msec = 100;
861 unsigned long duration;
862 struct tpm2_cmd cmd;
863 int i;
864
865 duration = tpm2_calc_ordinal_duration(chip, TPM2_CC_SELF_TEST);
866
867 loops = jiffies_to_msecs(duration) / delay_msec;
868
869 rc = tpm2_start_selftest(chip, true);
870 if (rc)
871 return rc;
872
873 for (i = 0; i < loops; i++) {
874 /* Attempt to read a PCR value */
875 cmd.header.in = tpm2_pcrread_header;
876 cmd.params.pcrread_in.pcr_selects_cnt = cpu_to_be32(1);
877 cmd.params.pcrread_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
878 cmd.params.pcrread_in.pcr_select_size = TPM2_PCR_SELECT_MIN;
879 cmd.params.pcrread_in.pcr_select[0] = 0x01;
880 cmd.params.pcrread_in.pcr_select[1] = 0x00;
881 cmd.params.pcrread_in.pcr_select[2] = 0x00;
882
883 rc = tpm_transmit_cmd(chip, (u8 *) &cmd, sizeof(cmd), NULL);
884 if (rc < 0)
885 break;
886
887 rc = be32_to_cpu(cmd.header.out.return_code);
888 if (rc != TPM2_RC_TESTING)
889 break;
890
891 msleep(delay_msec);
892 }
893
894 return rc;
895 }
896
897 /**
898 * tpm2_gen_interrupt() - generate an interrupt
899 * @chip: TPM chip to use
900 *
901 * 0 is returned when the operation is successful. If a negative number is
902 * returned it remarks a POSIX error code. If a positive number is returned
903 * it remarks a TPM error.
904 */
905 int tpm2_gen_interrupt(struct tpm_chip *chip)
906 {
907 u32 dummy;
908
909 return tpm2_get_tpm_pt(chip, 0x100, &dummy,
910 "attempting to generate an interrupt");
911 }
912 EXPORT_SYMBOL_GPL(tpm2_gen_interrupt);
913
914 /**
915 * tpm2_probe() - probe TPM 2.0
916 * @chip: TPM chip to use
917 *
918 * Send idempotent TPM 2.0 command and see whether TPM 2.0 chip replied based on
919 * the reply tag.
920 */
921 int tpm2_probe(struct tpm_chip *chip)
922 {
923 struct tpm2_cmd cmd;
924 int rc;
925
926 cmd.header.in = tpm2_get_tpm_pt_header;
927 cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES);
928 cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(0x100);
929 cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1);
930
931 rc = tpm_transmit(chip, (const char *) &cmd, sizeof(cmd));
932 if (rc < 0)
933 return rc;
934 else if (rc < TPM_HEADER_SIZE)
935 return -EFAULT;
936
937 if (be16_to_cpu(cmd.header.out.tag) == TPM2_ST_NO_SESSIONS)
938 chip->flags |= TPM_CHIP_FLAG_TPM2;
939
940 return 0;
941 }
942 EXPORT_SYMBOL_GPL(tpm2_probe);
943
944 /**
945 * tpm2_auto_startup - Perform the standard automatic TPM initialization
946 * sequence
947 * @chip: TPM chip to use
948 *
949 * Returns 0 on success, < 0 in case of fatal error.
950 */
951 int tpm2_auto_startup(struct tpm_chip *chip)
952 {
953 int rc;
954
955 rc = tpm_get_timeouts(chip);
956 if (rc)
957 goto out;
958
959 rc = tpm2_do_selftest(chip);
960 if (rc != 0 && rc != TPM2_RC_INITIALIZE) {
961 dev_err(&chip->dev, "TPM self test failed\n");
962 goto out;
963 }
964
965 if (rc == TPM2_RC_INITIALIZE) {
966 rc = tpm2_startup(chip, TPM2_SU_CLEAR);
967 if (rc)
968 goto out;
969
970 rc = tpm2_do_selftest(chip);
971 if (rc) {
972 dev_err(&chip->dev, "TPM self test failed\n");
973 goto out;
974 }
975 }
976
977 out:
978 if (rc > 0)
979 rc = -ENODEV;
980 return rc;
981 }
Linux with added FPC-III support