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tpm: fix crash in tpm_tis deinitialization
[deliverable/linux.git] / drivers / char / tpm / tpm2-cmd.c
CommitLineData
7a1d7e6d 1/*
954650ef 2 * Copyright (C) 2014, 2015 Intel Corporation
7a1d7e6d
JS		 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"
5ca4c20c 19#include <crypto/hash_info.h>
954650ef
JS		 20#include <keys/trusted-type.h>
21
22enum tpm2_object_attributes {
c0b5eed1
JS		 23 TPM2_OA_USER_WITH_AUTH = BIT(6),
24};
25
26enum tpm2_session_attributes {
27 TPM2_SA_CONTINUE_SESSION = BIT(0),
954650ef 28};
7a1d7e6d
JS		 29
30struct tpm2_startup_in {
31 __be16 startup_type;
32} __packed;
33
34struct tpm2_self_test_in {
35 u8 full_test;
36} __packed;
37
38struct 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
45struct 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
56struct tpm2_null_auth_area {
57 __be32 handle;
58 __be16 nonce_size;
59 u8 attributes;
60 __be16 auth_size;
61} __packed;
62
63struct 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
72struct tpm2_get_tpm_pt_in {
73 __be32 cap_id;
74 __be32 property_id;
75 __be32 property_cnt;
76} __packed;
77
78struct 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
86struct tpm2_get_random_in {
87 __be16 size;
88} __packed;
89
90struct tpm2_get_random_out {
91 __be16 size;
92 u8 buffer[TPM_MAX_RNG_DATA];
93} __packed;
94
95union 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
107struct tpm2_cmd {
108 tpm_cmd_header header;
109 union tpm2_cmd_params params;
110} __packed;
111
5ca4c20c
JS		 112struct tpm2_hash {
113 unsigned int crypto_id;
114 unsigned int tpm_id;
115};
116
117static 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
7a1d7e6d
JS		 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 */
131static 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
251static 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 */
267int 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
299static 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 */
315int 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
343static 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 */
359int 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
400static 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
954650ef
JS		 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 */
417static 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 */
444int 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;
5ca4c20c
JS		 450 u32 hash;
451 int i;
954650ef
JS		 452 int rc;
453
5ca4c20c
JS		 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
954650ef
JS		 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 */
2e31125c 476 tpm_buf_append_u16(&buf, 4 + TPM_DIGEST_SIZE + payload->key_len + 1);
954650ef
JS		 477
478 tpm_buf_append_u16(&buf, TPM_DIGEST_SIZE);
479 tpm_buf_append(&buf, options->blobauth, TPM_DIGEST_SIZE);
2e31125c 480 tpm_buf_append_u16(&buf, payload->key_len + 1);
954650ef 481 tpm_buf_append(&buf, payload->key, payload->key_len);
2e31125c 482 tpm_buf_append_u8(&buf, payload->migratable);
954650ef
JS		 483
484 /* public */
f3c82ade 485 tpm_buf_append_u16(&buf, 14 + options->policydigest_len);
954650ef 486 tpm_buf_append_u16(&buf, TPM2_ALG_KEYEDHASH);
5ca4c20c 487 tpm_buf_append_u16(&buf, hash);
5beb0c43
JS		 488
489 /* policy */
f3c82ade 490 if (options->policydigest_len) {
5beb0c43 491 tpm_buf_append_u32(&buf, 0);
f3c82ade 492 tpm_buf_append_u16(&buf, options->policydigest_len);
5beb0c43 493 tpm_buf_append(&buf, options->policydigest,
f3c82ade 494 options->policydigest_len);
5beb0c43 495 } else {
c0b5eed1 496 tpm_buf_append_u32(&buf, TPM2_OA_USER_WITH_AUTH);
5beb0c43
JS		 497 tpm_buf_append_u16(&buf, 0);
498 }
499
500 /* public parameters */
954650ef
JS		 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
528out:
529 tpm_buf_destroy(&buf);
530
5ca4c20c
JS		 531 if (rc > 0) {
532 if ((rc & TPM2_RC_HASH) == TPM2_RC_HASH)
533 rc = -EINVAL;
534 else
535 rc = -EPERM;
536 }
954650ef
JS		 537
538 return rc;
539}
540
541static 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
584out:
585 tpm_buf_destroy(&buf);
586
587 if (rc > 0)
588 rc = -EPERM;
589
590 return rc;
591}
592
593static 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) {
8cfffc9d 600 dev_warn(&chip->dev, "0x%08x was not flushed, out of memory\n",
954650ef
JS		 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)
8cfffc9d 609 dev_warn(&chip->dev, "0x%08x was not flushed, rc=%d\n", handle,
954650ef
JS		 610 rc);
611
612 tpm_buf_destroy(&buf);
613}
614
615static 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;
2e31125c
JS		 621 u16 data_len;
622 u8 *data;
954650ef
JS		 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);
5beb0c43
JS		 630 tpm2_buf_append_auth(&buf,
631 options->policyhandle ?
632 options->policyhandle : TPM2_RS_PW,
954650ef 633 NULL /* nonce */, 0,
c0b5eed1 634 TPM2_SA_CONTINUE_SESSION,
954650ef
JS		 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) {
2e31125c 643 data_len = be16_to_cpup(
954650ef 644 (__be16 *) &buf.data[TPM_HEADER_SIZE + 4]);
2e31125c 645 data = &buf.data[TPM_HEADER_SIZE + 6];
954650ef 646
2e31125c
JS		 647 memcpy(payload->key, data, data_len - 1);
648 payload->key_len = data_len - 1;
649 payload->migratable = data[data_len - 1];
954650ef
JS		 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 */
664int 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
7a1d7e6d
JS		 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 */
693ssize_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 = 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
715static 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 */
731int 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}
741EXPORT_SYMBOL_GPL(tpm2_startup);
742
743#define TPM2_SHUTDOWN_IN_SIZE \
744 (sizeof(struct tpm_input_header) + \
745 sizeof(struct tpm2_startup_in))
746
747static const struct tpm_input_header tpm2_shutdown_header = {
748 .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
749 .length = cpu_to_be32(TPM2_SHUTDOWN_IN_SIZE),
750 .ordinal = cpu_to_be32(TPM2_CC_SHUTDOWN)
751};
752
753/**
754 * tpm2_shutdown() - send shutdown command to the TPM chip
755 * @chip: TPM chip to use.
756 * @shutdown_type shutdown type. The value is either
757 * TPM_SU_CLEAR or TPM_SU_STATE.
7a1d7e6d 758 */
74d6b3ce 759void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type)
7a1d7e6d
JS		 760{
761 struct tpm2_cmd cmd;
74d6b3ce 762 int rc;
7a1d7e6d
JS		 763
764 cmd.header.in = tpm2_shutdown_header;
7a1d7e6d 765 cmd.params.startup_in.startup_type = cpu_to_be16(shutdown_type);
74d6b3ce
JS		 766
767 rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), "stopping the TPM");
768
769 /* In places where shutdown command is sent there's no much we can do
770 * except print the error code on a system failure.
771 */
772 if (rc < 0)
8cfffc9d 773 dev_warn(&chip->dev, "transmit returned %d while stopping the TPM",
74d6b3ce 774 rc);
7a1d7e6d 775}
7a1d7e6d
JS		 776
777/*
778 * tpm2_calc_ordinal_duration() - maximum duration for a command
779 * @chip: TPM chip to use.
780 * @ordinal: command code number.
781 *
782 * 0 is returned when the operation is successful. If a negative number is
783 * returned it remarks a POSIX error code. If a positive number is returned
784 * it remarks a TPM error.
785 */
786unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
787{
788 int index = TPM_UNDEFINED;
789 int duration = 0;
790
791 if (ordinal >= TPM2_CC_FIRST && ordinal <= TPM2_CC_LAST)
792 index = tpm2_ordinal_duration[ordinal - TPM2_CC_FIRST];
793
794 if (index != TPM_UNDEFINED)
795 duration = chip->vendor.duration[index];
796
797 if (duration <= 0)
798 duration = 2 * 60 * HZ;
799
800 return duration;
801}
802EXPORT_SYMBOL_GPL(tpm2_calc_ordinal_duration);
803
804#define TPM2_SELF_TEST_IN_SIZE \
805 (sizeof(struct tpm_input_header) + \
806 sizeof(struct tpm2_self_test_in))
807
808static const struct tpm_input_header tpm2_selftest_header = {
809 .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
810 .length = cpu_to_be32(TPM2_SELF_TEST_IN_SIZE),
811 .ordinal = cpu_to_be32(TPM2_CC_SELF_TEST)
812};
813
814/**
815 * tpm2_continue_selftest() - start a self test
816 * @chip: TPM chip to use
817 * @full: test all commands instead of testing only those that were not
818 * previously tested.
819 *
820 * 0 is returned when the operation is successful. If a negative number is
821 * returned it remarks a POSIX error code. If a positive number is returned
822 * it remarks a TPM error.
823 */
824static int tpm2_start_selftest(struct tpm_chip *chip, bool full)
825{
826 int rc;
827 struct tpm2_cmd cmd;
828
829 cmd.header.in = tpm2_selftest_header;
830 cmd.params.selftest_in.full_test = full;
831
832 rc = tpm_transmit_cmd(chip, &cmd, TPM2_SELF_TEST_IN_SIZE,
833 "continue selftest");
834
835 /* At least some prototype chips seem to give RC_TESTING error
836 * immediately. This is a workaround for that.
837 */
838 if (rc == TPM2_RC_TESTING) {
8cfffc9d 839 dev_warn(&chip->dev, "Got RC_TESTING, ignoring\n");
7a1d7e6d
JS		 840 rc = 0;
841 }
842
843 return rc;
844}
845
846/**
847 * tpm2_do_selftest() - run a full self test
848 * @chip: TPM chip to use
849 *
850 * During the self test TPM2 commands return with the error code RC_TESTING.
851 * Waiting is done by issuing PCR read until it executes successfully.
852 *
853 * 0 is returned when the operation is successful. If a negative number is
854 * returned it remarks a POSIX error code. If a positive number is returned
855 * it remarks a TPM error.
856 */
857int tpm2_do_selftest(struct tpm_chip *chip)
858{
859 int rc;
860 unsigned int loops;
861 unsigned int delay_msec = 100;
862 unsigned long duration;
863 struct tpm2_cmd cmd;
864 int i;
865
866 duration = tpm2_calc_ordinal_duration(chip, TPM2_CC_SELF_TEST);
867
868 loops = jiffies_to_msecs(duration) / delay_msec;
869
870 rc = tpm2_start_selftest(chip, true);
871 if (rc)
872 return rc;
873
874 for (i = 0; i < loops; i++) {
875 /* Attempt to read a PCR value */
876 cmd.header.in = tpm2_pcrread_header;
877 cmd.params.pcrread_in.pcr_selects_cnt = cpu_to_be32(1);
878 cmd.params.pcrread_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
879 cmd.params.pcrread_in.pcr_select_size = TPM2_PCR_SELECT_MIN;
880 cmd.params.pcrread_in.pcr_select[0] = 0x01;
881 cmd.params.pcrread_in.pcr_select[1] = 0x00;
882 cmd.params.pcrread_in.pcr_select[2] = 0x00;
883
884 rc = tpm_transmit_cmd(chip, (u8 *) &cmd, sizeof(cmd), NULL);
885 if (rc < 0)
886 break;
887
888 rc = be32_to_cpu(cmd.header.out.return_code);
889 if (rc != TPM2_RC_TESTING)
890 break;
891
892 msleep(delay_msec);
893 }
894
895 return rc;
896}
897EXPORT_SYMBOL_GPL(tpm2_do_selftest);
898
899/**
900 * tpm2_gen_interrupt() - generate an interrupt
901 * @chip: TPM chip to use
7a1d7e6d
JS		 902 *
903 * 0 is returned when the operation is successful. If a negative number is
904 * returned it remarks a POSIX error code. If a positive number is returned
905 * it remarks a TPM error.
906 */
4d5f2051 907int tpm2_gen_interrupt(struct tpm_chip *chip)
7a1d7e6d 908{
7a1d7e6d
JS		 909 u32 dummy;
910
4d5f2051
JS		 911 return tpm2_get_tpm_pt(chip, 0x100, &dummy,
912 "attempting to generate an interrupt");
7a1d7e6d
JS		 913}
914EXPORT_SYMBOL_GPL(tpm2_gen_interrupt);
4d5f2051
JS		 915
916/**
917 * tpm2_probe() - probe TPM 2.0
918 * @chip: TPM chip to use
919 *
920 * Send idempotent TPM 2.0 command and see whether TPM 2.0 chip replied based on
921 * the reply tag.
922 */
923int tpm2_probe(struct tpm_chip *chip)
924{
925 struct tpm2_cmd cmd;
926 int rc;
927
928 cmd.header.in = tpm2_get_tpm_pt_header;
929 cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES);
930 cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(0x100);
931 cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1);
932
933 rc = tpm_transmit(chip, (const char *) &cmd, sizeof(cmd));
934 if (rc < 0)
935 return rc;
936 else if (rc < TPM_HEADER_SIZE)
937 return -EFAULT;
938
939 if (be16_to_cpu(cmd.header.out.tag) == TPM2_ST_NO_SESSIONS)
940 chip->flags |= TPM_CHIP_FLAG_TPM2;
941
942 return 0;
943}
944EXPORT_SYMBOL_GPL(tpm2_probe);
Linux kernel - Deliverables
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