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x86/topology: Fix function name in documentation
[cris-mirror.git] / drivers / char / tpm / tpm2-cmd.c
blobc17e75348a991e355236f2040f931e940541049f
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_get_tpm_pt_in {
39 __be32 cap_id;
40 __be32 property_id;
41 __be32 property_cnt;
42 } __packed;
43
44 struct tpm2_get_tpm_pt_out {
45 u8 more_data;
46 __be32 subcap_id;
47 __be32 property_cnt;
48 __be32 property_id;
49 __be32 value;
50 } __packed;
51
52 struct tpm2_get_random_in {
53 __be16 size;
54 } __packed;
55
56 struct tpm2_get_random_out {
57 __be16 size;
58 u8 buffer[TPM_MAX_RNG_DATA];
59 } __packed;
60
61 union tpm2_cmd_params {
62 struct tpm2_startup_in startup_in;
63 struct tpm2_self_test_in selftest_in;
64 struct tpm2_get_tpm_pt_in get_tpm_pt_in;
65 struct tpm2_get_tpm_pt_out get_tpm_pt_out;
66 struct tpm2_get_random_in getrandom_in;
67 struct tpm2_get_random_out getrandom_out;
68 };
69
70 struct tpm2_cmd {
71 tpm_cmd_header header;
72 union tpm2_cmd_params params;
73 } __packed;
74
75 struct tpm2_hash {
76 unsigned int crypto_id;
77 unsigned int tpm_id;
78 };
79
80 static struct tpm2_hash tpm2_hash_map[] = {
81 {HASH_ALGO_SHA1, TPM2_ALG_SHA1},
82 {HASH_ALGO_SHA256, TPM2_ALG_SHA256},
83 {HASH_ALGO_SHA384, TPM2_ALG_SHA384},
84 {HASH_ALGO_SHA512, TPM2_ALG_SHA512},
85 {HASH_ALGO_SM3_256, TPM2_ALG_SM3_256},
86 };
87
88 /*
89 * Array with one entry per ordinal defining the maximum amount
90 * of time the chip could take to return the result. The values
91 * of the SHORT, MEDIUM, and LONG durations are taken from the
92 * PC Client Profile (PTP) specification.
93 */
94 static const u8 tpm2_ordinal_duration[TPM2_CC_LAST - TPM2_CC_FIRST + 1] = {
95 TPM_UNDEFINED, /* 11F */
96 TPM_UNDEFINED, /* 120 */
97 TPM_LONG, /* 121 */
98 TPM_UNDEFINED, /* 122 */
99 TPM_UNDEFINED, /* 123 */
100 TPM_UNDEFINED, /* 124 */
101 TPM_UNDEFINED, /* 125 */
102 TPM_UNDEFINED, /* 126 */
103 TPM_UNDEFINED, /* 127 */
104 TPM_UNDEFINED, /* 128 */
105 TPM_LONG, /* 129 */
106 TPM_UNDEFINED, /* 12a */
107 TPM_UNDEFINED, /* 12b */
108 TPM_UNDEFINED, /* 12c */
109 TPM_UNDEFINED, /* 12d */
110 TPM_UNDEFINED, /* 12e */
111 TPM_UNDEFINED, /* 12f */
112 TPM_UNDEFINED, /* 130 */
113 TPM_UNDEFINED, /* 131 */
114 TPM_UNDEFINED, /* 132 */
115 TPM_UNDEFINED, /* 133 */
116 TPM_UNDEFINED, /* 134 */
117 TPM_UNDEFINED, /* 135 */
118 TPM_UNDEFINED, /* 136 */
119 TPM_UNDEFINED, /* 137 */
120 TPM_UNDEFINED, /* 138 */
121 TPM_UNDEFINED, /* 139 */
122 TPM_UNDEFINED, /* 13a */
123 TPM_UNDEFINED, /* 13b */
124 TPM_UNDEFINED, /* 13c */
125 TPM_UNDEFINED, /* 13d */
126 TPM_MEDIUM, /* 13e */
127 TPM_UNDEFINED, /* 13f */
128 TPM_UNDEFINED, /* 140 */
129 TPM_UNDEFINED, /* 141 */
130 TPM_UNDEFINED, /* 142 */
131 TPM_LONG, /* 143 */
132 TPM_MEDIUM, /* 144 */
133 TPM_UNDEFINED, /* 145 */
134 TPM_UNDEFINED, /* 146 */
135 TPM_UNDEFINED, /* 147 */
136 TPM_UNDEFINED, /* 148 */
137 TPM_UNDEFINED, /* 149 */
138 TPM_UNDEFINED, /* 14a */
139 TPM_UNDEFINED, /* 14b */
140 TPM_UNDEFINED, /* 14c */
141 TPM_UNDEFINED, /* 14d */
142 TPM_LONG, /* 14e */
143 TPM_UNDEFINED, /* 14f */
144 TPM_UNDEFINED, /* 150 */
145 TPM_UNDEFINED, /* 151 */
146 TPM_UNDEFINED, /* 152 */
147 TPM_UNDEFINED, /* 153 */
148 TPM_UNDEFINED, /* 154 */
149 TPM_UNDEFINED, /* 155 */
150 TPM_UNDEFINED, /* 156 */
151 TPM_UNDEFINED, /* 157 */
152 TPM_UNDEFINED, /* 158 */
153 TPM_UNDEFINED, /* 159 */
154 TPM_UNDEFINED, /* 15a */
155 TPM_UNDEFINED, /* 15b */
156 TPM_MEDIUM, /* 15c */
157 TPM_UNDEFINED, /* 15d */
158 TPM_UNDEFINED, /* 15e */
159 TPM_UNDEFINED, /* 15f */
160 TPM_UNDEFINED, /* 160 */
161 TPM_UNDEFINED, /* 161 */
162 TPM_UNDEFINED, /* 162 */
163 TPM_UNDEFINED, /* 163 */
164 TPM_UNDEFINED, /* 164 */
165 TPM_UNDEFINED, /* 165 */
166 TPM_UNDEFINED, /* 166 */
167 TPM_UNDEFINED, /* 167 */
168 TPM_UNDEFINED, /* 168 */
169 TPM_UNDEFINED, /* 169 */
170 TPM_UNDEFINED, /* 16a */
171 TPM_UNDEFINED, /* 16b */
172 TPM_UNDEFINED, /* 16c */
173 TPM_UNDEFINED, /* 16d */
174 TPM_UNDEFINED, /* 16e */
175 TPM_UNDEFINED, /* 16f */
176 TPM_UNDEFINED, /* 170 */
177 TPM_UNDEFINED, /* 171 */
178 TPM_UNDEFINED, /* 172 */
179 TPM_UNDEFINED, /* 173 */
180 TPM_UNDEFINED, /* 174 */
181 TPM_UNDEFINED, /* 175 */
182 TPM_UNDEFINED, /* 176 */
183 TPM_LONG, /* 177 */
184 TPM_UNDEFINED, /* 178 */
185 TPM_UNDEFINED, /* 179 */
186 TPM_MEDIUM, /* 17a */
187 TPM_LONG, /* 17b */
188 TPM_UNDEFINED, /* 17c */
189 TPM_UNDEFINED, /* 17d */
190 TPM_UNDEFINED, /* 17e */
191 TPM_UNDEFINED, /* 17f */
192 TPM_UNDEFINED, /* 180 */
193 TPM_UNDEFINED, /* 181 */
194 TPM_MEDIUM, /* 182 */
195 TPM_UNDEFINED, /* 183 */
196 TPM_UNDEFINED, /* 184 */
197 TPM_MEDIUM, /* 185 */
198 TPM_MEDIUM, /* 186 */
199 TPM_UNDEFINED, /* 187 */
200 TPM_UNDEFINED, /* 188 */
201 TPM_UNDEFINED, /* 189 */
202 TPM_UNDEFINED, /* 18a */
203 TPM_UNDEFINED, /* 18b */
204 TPM_UNDEFINED, /* 18c */
205 TPM_UNDEFINED, /* 18d */
206 TPM_UNDEFINED, /* 18e */
207 TPM_UNDEFINED /* 18f */
208 };
209
210 struct tpm2_pcr_read_out {
211 __be32 update_cnt;
212 __be32 pcr_selects_cnt;
213 __be16 hash_alg;
214 u8 pcr_select_size;
215 u8 pcr_select[TPM2_PCR_SELECT_MIN];
216 __be32 digests_cnt;
217 __be16 digest_size;
218 u8 digest[];
219 } __packed;
220
221 /**
222 * tpm2_pcr_read() - read a PCR value
223 * @chip: TPM chip to use.
224 * @pcr_idx: index of the PCR to read.
225 * @res_buf: buffer to store the resulting hash.
226 *
227 * Return: Same as with tpm_transmit_cmd.
228 */
229 int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
230 {
231 int rc;
232 struct tpm_buf buf;
233 struct tpm2_pcr_read_out *out;
234 u8 pcr_select[TPM2_PCR_SELECT_MIN] = {0};
235
236 if (pcr_idx >= TPM2_PLATFORM_PCR)
237 return -EINVAL;
238
239 rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_PCR_READ);
240 if (rc)
241 return rc;
242
243 pcr_select[pcr_idx >> 3] = 1 << (pcr_idx & 0x7);
244
245 tpm_buf_append_u32(&buf, 1);
246 tpm_buf_append_u16(&buf, TPM2_ALG_SHA1);
247 tpm_buf_append_u8(&buf, TPM2_PCR_SELECT_MIN);
248 tpm_buf_append(&buf, (const unsigned char *)pcr_select,
249 sizeof(pcr_select));
250
251 rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 0, 0,
252 res_buf ? "attempting to read a pcr value" : NULL);
253 if (rc == 0 && res_buf) {
254 out = (struct tpm2_pcr_read_out *)&buf.data[TPM_HEADER_SIZE];
255 memcpy(res_buf, out->digest, SHA1_DIGEST_SIZE);
256 }
257
258 tpm_buf_destroy(&buf);
259 return rc;
260 }
261
262 struct tpm2_null_auth_area {
263 __be32 handle;
264 __be16 nonce_size;
265 u8 attributes;
266 __be16 auth_size;
267 } __packed;
268
269 /**
270 * tpm2_pcr_extend() - extend a PCR value
271 *
272 * @chip: TPM chip to use.
273 * @pcr_idx: index of the PCR.
274 * @count: number of digests passed.
275 * @digests: list of pcr banks and corresponding digest values to extend.
276 *
277 * Return: Same as with tpm_transmit_cmd.
278 */
279 int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, u32 count,
280 struct tpm2_digest *digests)
281 {
282 struct tpm_buf buf;
283 struct tpm2_null_auth_area auth_area;
284 int rc;
285 int i;
286 int j;
287
288 if (count > ARRAY_SIZE(chip->active_banks))
289 return -EINVAL;
290
291 rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_PCR_EXTEND);
292 if (rc)
293 return rc;
294
295 tpm_buf_append_u32(&buf, pcr_idx);
296
297 auth_area.handle = cpu_to_be32(TPM2_RS_PW);
298 auth_area.nonce_size = 0;
299 auth_area.attributes = 0;
300 auth_area.auth_size = 0;
301
302 tpm_buf_append_u32(&buf, sizeof(struct tpm2_null_auth_area));
303 tpm_buf_append(&buf, (const unsigned char *)&auth_area,
304 sizeof(auth_area));
305 tpm_buf_append_u32(&buf, count);
306
307 for (i = 0; i < count; i++) {
308 for (j = 0; j < ARRAY_SIZE(tpm2_hash_map); j++) {
309 if (digests[i].alg_id != tpm2_hash_map[j].tpm_id)
310 continue;
311 tpm_buf_append_u16(&buf, digests[i].alg_id);
312 tpm_buf_append(&buf, (const unsigned char
313 *)&digests[i].digest,
314 hash_digest_size[tpm2_hash_map[j].crypto_id]);
315 }
316 }
317
318 rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 0, 0,
319 "attempting extend a PCR value");
320
321 tpm_buf_destroy(&buf);
322
323 return rc;
324 }
325
326
327 #define TPM2_GETRANDOM_IN_SIZE \
328 (sizeof(struct tpm_input_header) + \
329 sizeof(struct tpm2_get_random_in))
330
331 static const struct tpm_input_header tpm2_getrandom_header = {
332 .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
333 .length = cpu_to_be32(TPM2_GETRANDOM_IN_SIZE),
334 .ordinal = cpu_to_be32(TPM2_CC_GET_RANDOM)
335 };
336
337 /**
338 * tpm2_get_random() - get random bytes from the TPM RNG
339 *
340 * @chip: TPM chip to use
341 * @out: destination buffer for the random bytes
342 * @max: the max number of bytes to write to @out
343 *
344 * Return:
345 * Size of the output buffer, or -EIO on error.
346 */
347 int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max)
348 {
349 struct tpm2_cmd cmd;
350 u32 recd, rlength;
351 u32 num_bytes;
352 int err;
353 int total = 0;
354 int retries = 5;
355 u8 *dest = out;
356
357 num_bytes = min_t(u32, max, sizeof(cmd.params.getrandom_out.buffer));
358
359 if (!out || !num_bytes ||
360 max > sizeof(cmd.params.getrandom_out.buffer))
361 return -EINVAL;
362
363 do {
364 cmd.header.in = tpm2_getrandom_header;
365 cmd.params.getrandom_in.size = cpu_to_be16(num_bytes);
366
367 err = tpm_transmit_cmd(chip, NULL, &cmd, sizeof(cmd),
368 offsetof(struct tpm2_get_random_out,
369 buffer),
370 0, "attempting get random");
371 if (err)
372 break;
373
374 recd = min_t(u32, be16_to_cpu(cmd.params.getrandom_out.size),
375 num_bytes);
376 rlength = be32_to_cpu(cmd.header.out.length);
377 if (rlength < offsetof(struct tpm2_get_random_out, buffer) +
378 recd)
379 return -EFAULT;
380 memcpy(dest, cmd.params.getrandom_out.buffer, recd);
381
382 dest += recd;
383 total += recd;
384 num_bytes -= recd;
385 } while (retries-- && total < max);
386
387 return total ? total : -EIO;
388 }
389
390 #define TPM2_GET_TPM_PT_IN_SIZE \
391 (sizeof(struct tpm_input_header) + \
392 sizeof(struct tpm2_get_tpm_pt_in))
393
394 #define TPM2_GET_TPM_PT_OUT_BODY_SIZE \
395 sizeof(struct tpm2_get_tpm_pt_out)
396
397 static const struct tpm_input_header tpm2_get_tpm_pt_header = {
398 .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
399 .length = cpu_to_be32(TPM2_GET_TPM_PT_IN_SIZE),
400 .ordinal = cpu_to_be32(TPM2_CC_GET_CAPABILITY)
401 };
402
403 /**
404 * tpm2_flush_context_cmd() - execute a TPM2_FlushContext command
405 * @chip: TPM chip to use
406 * @payload: the key data in clear and encrypted form
407 * @options: authentication values and other options
408 *
409 * Return: same as with tpm_transmit_cmd
410 */
411 void tpm2_flush_context_cmd(struct tpm_chip *chip, u32 handle,
412 unsigned int flags)
413 {
414 struct tpm_buf buf;
415 int rc;
416
417 rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_FLUSH_CONTEXT);
418 if (rc) {
419 dev_warn(&chip->dev, "0x%08x was not flushed, out of memory\n",
420 handle);
421 return;
422 }
423
424 tpm_buf_append_u32(&buf, handle);
425
426 (void) tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 0, flags,
427 "flushing context");
428
429 tpm_buf_destroy(&buf);
430 }
431
432 /**
433 * tpm_buf_append_auth() - append TPMS_AUTH_COMMAND to the buffer.
434 *
435 * @buf: an allocated tpm_buf instance
436 * @session_handle: session handle
437 * @nonce: the session nonce, may be NULL if not used
438 * @nonce_len: the session nonce length, may be 0 if not used
439 * @attributes: the session attributes
440 * @hmac: the session HMAC or password, may be NULL if not used
441 * @hmac_len: the session HMAC or password length, maybe 0 if not used
442 */
443 static void tpm2_buf_append_auth(struct tpm_buf *buf, u32 session_handle,
444 const u8 *nonce, u16 nonce_len,
445 u8 attributes,
446 const u8 *hmac, u16 hmac_len)
447 {
448 tpm_buf_append_u32(buf, 9 + nonce_len + hmac_len);
449 tpm_buf_append_u32(buf, session_handle);
450 tpm_buf_append_u16(buf, nonce_len);
451
452 if (nonce && nonce_len)
453 tpm_buf_append(buf, nonce, nonce_len);
454
455 tpm_buf_append_u8(buf, attributes);
456 tpm_buf_append_u16(buf, hmac_len);
457
458 if (hmac && hmac_len)
459 tpm_buf_append(buf, hmac, hmac_len);
460 }
461
462 /**
463 * tpm2_seal_trusted() - seal the payload of a trusted key
464 *
465 * @chip: TPM chip to use
466 * @payload: the key data in clear and encrypted form
467 * @options: authentication values and other options
468 *
469 * Return: < 0 on error and 0 on success.
470 */
471 int tpm2_seal_trusted(struct tpm_chip *chip,
472 struct trusted_key_payload *payload,
473 struct trusted_key_options *options)
474 {
475 unsigned int blob_len;
476 struct tpm_buf buf;
477 u32 hash, rlength;
478 int i;
479 int rc;
480
481 for (i = 0; i < ARRAY_SIZE(tpm2_hash_map); i++) {
482 if (options->hash == tpm2_hash_map[i].crypto_id) {
483 hash = tpm2_hash_map[i].tpm_id;
484 break;
485 }
486 }
487
488 if (i == ARRAY_SIZE(tpm2_hash_map))
489 return -EINVAL;
490
491 rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_CREATE);
492 if (rc)
493 return rc;
494
495 tpm_buf_append_u32(&buf, options->keyhandle);
496 tpm2_buf_append_auth(&buf, TPM2_RS_PW,
497 NULL /* nonce */, 0,
498 0 /* session_attributes */,
499 options->keyauth /* hmac */,
500 TPM_DIGEST_SIZE);
501
502 /* sensitive */
503 tpm_buf_append_u16(&buf, 4 + TPM_DIGEST_SIZE + payload->key_len + 1);
504
505 tpm_buf_append_u16(&buf, TPM_DIGEST_SIZE);
506 tpm_buf_append(&buf, options->blobauth, TPM_DIGEST_SIZE);
507 tpm_buf_append_u16(&buf, payload->key_len + 1);
508 tpm_buf_append(&buf, payload->key, payload->key_len);
509 tpm_buf_append_u8(&buf, payload->migratable);
510
511 /* public */
512 tpm_buf_append_u16(&buf, 14 + options->policydigest_len);
513 tpm_buf_append_u16(&buf, TPM2_ALG_KEYEDHASH);
514 tpm_buf_append_u16(&buf, hash);
515
516 /* policy */
517 if (options->policydigest_len) {
518 tpm_buf_append_u32(&buf, 0);
519 tpm_buf_append_u16(&buf, options->policydigest_len);
520 tpm_buf_append(&buf, options->policydigest,
521 options->policydigest_len);
522 } else {
523 tpm_buf_append_u32(&buf, TPM2_OA_USER_WITH_AUTH);
524 tpm_buf_append_u16(&buf, 0);
525 }
526
527 /* public parameters */
528 tpm_buf_append_u16(&buf, TPM2_ALG_NULL);
529 tpm_buf_append_u16(&buf, 0);
530
531 /* outside info */
532 tpm_buf_append_u16(&buf, 0);
533
534 /* creation PCR */
535 tpm_buf_append_u32(&buf, 0);
536
537 if (buf.flags & TPM_BUF_OVERFLOW) {
538 rc = -E2BIG;
539 goto out;
540 }
541
542 rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 4, 0,
543 "sealing data");
544 if (rc)
545 goto out;
546
547 blob_len = be32_to_cpup((__be32 *) &buf.data[TPM_HEADER_SIZE]);
548 if (blob_len > MAX_BLOB_SIZE) {
549 rc = -E2BIG;
550 goto out;
551 }
552 rlength = be32_to_cpu(((struct tpm2_cmd *)&buf)->header.out.length);
553 if (rlength < TPM_HEADER_SIZE + 4 + blob_len) {
554 rc = -EFAULT;
555 goto out;
556 }
557
558 memcpy(payload->blob, &buf.data[TPM_HEADER_SIZE + 4], blob_len);
559 payload->blob_len = blob_len;
560
561 out:
562 tpm_buf_destroy(&buf);
563
564 if (rc > 0) {
565 if (tpm2_rc_value(rc) == TPM2_RC_HASH)
566 rc = -EINVAL;
567 else
568 rc = -EPERM;
569 }
570
571 return rc;
572 }
573
574 /**
575 * tpm2_load_cmd() - execute a TPM2_Load command
576 *
577 * @chip: TPM chip to use
578 * @payload: the key data in clear and encrypted form
579 * @options: authentication values and other options
580 * @blob_handle: returned blob handle
581 * @flags: tpm transmit flags
582 *
583 * Return: 0 on success.
584 * -E2BIG on wrong payload size.
585 * -EPERM on tpm error status.
586 * < 0 error from tpm_transmit_cmd.
587 */
588 static int tpm2_load_cmd(struct tpm_chip *chip,
589 struct trusted_key_payload *payload,
590 struct trusted_key_options *options,
591 u32 *blob_handle, unsigned int flags)
592 {
593 struct tpm_buf buf;
594 unsigned int private_len;
595 unsigned int public_len;
596 unsigned int blob_len;
597 int rc;
598
599 private_len = be16_to_cpup((__be16 *) &payload->blob[0]);
600 if (private_len > (payload->blob_len - 2))
601 return -E2BIG;
602
603 public_len = be16_to_cpup((__be16 *) &payload->blob[2 + private_len]);
604 blob_len = private_len + public_len + 4;
605 if (blob_len > payload->blob_len)
606 return -E2BIG;
607
608 rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_LOAD);
609 if (rc)
610 return rc;
611
612 tpm_buf_append_u32(&buf, options->keyhandle);
613 tpm2_buf_append_auth(&buf, TPM2_RS_PW,
614 NULL /* nonce */, 0,
615 0 /* session_attributes */,
616 options->keyauth /* hmac */,
617 TPM_DIGEST_SIZE);
618
619 tpm_buf_append(&buf, payload->blob, blob_len);
620
621 if (buf.flags & TPM_BUF_OVERFLOW) {
622 rc = -E2BIG;
623 goto out;
624 }
625
626 rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 4, flags,
627 "loading blob");
628 if (!rc)
629 *blob_handle = be32_to_cpup(
630 (__be32 *) &buf.data[TPM_HEADER_SIZE]);
631
632 out:
633 tpm_buf_destroy(&buf);
634
635 if (rc > 0)
636 rc = -EPERM;
637
638 return rc;
639 }
640
641 /**
642 * tpm2_unseal_cmd() - execute a TPM2_Unload command
643 *
644 * @chip: TPM chip to use
645 * @payload: the key data in clear and encrypted form
646 * @options: authentication values and other options
647 * @blob_handle: blob handle
648 * @flags: tpm_transmit_cmd flags
649 *
650 * Return: 0 on success
651 * -EPERM on tpm error status
652 * < 0 error from tpm_transmit_cmd
653 */
654 static int tpm2_unseal_cmd(struct tpm_chip *chip,
655 struct trusted_key_payload *payload,
656 struct trusted_key_options *options,
657 u32 blob_handle, unsigned int flags)
658 {
659 struct tpm_buf buf;
660 u16 data_len;
661 u8 *data;
662 int rc;
663 u32 rlength;
664
665 rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_UNSEAL);
666 if (rc)
667 return rc;
668
669 tpm_buf_append_u32(&buf, blob_handle);
670 tpm2_buf_append_auth(&buf,
671 options->policyhandle ?
672 options->policyhandle : TPM2_RS_PW,
673 NULL /* nonce */, 0,
674 TPM2_SA_CONTINUE_SESSION,
675 options->blobauth /* hmac */,
676 TPM_DIGEST_SIZE);
677
678 rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 6, flags,
679 "unsealing");
680 if (rc > 0)
681 rc = -EPERM;
682
683 if (!rc) {
684 data_len = be16_to_cpup(
685 (__be16 *) &buf.data[TPM_HEADER_SIZE + 4]);
686
687 rlength = be32_to_cpu(((struct tpm2_cmd *)&buf)
688 ->header.out.length);
689 if (rlength < TPM_HEADER_SIZE + 6 + data_len) {
690 rc = -EFAULT;
691 goto out;
692 }
693 data = &buf.data[TPM_HEADER_SIZE + 6];
694
695 memcpy(payload->key, data, data_len - 1);
696 payload->key_len = data_len - 1;
697 payload->migratable = data[data_len - 1];
698 }
699
700 out:
701 tpm_buf_destroy(&buf);
702 return rc;
703 }
704
705 /**
706 * tpm2_unseal_trusted() - unseal the payload of a trusted key
707 *
708 * @chip: TPM chip to use
709 * @payload: the key data in clear and encrypted form
710 * @options: authentication values and other options
711 *
712 * Return: Same as with tpm_transmit_cmd.
713 */
714 int tpm2_unseal_trusted(struct tpm_chip *chip,
715 struct trusted_key_payload *payload,
716 struct trusted_key_options *options)
717 {
718 u32 blob_handle;
719 int rc;
720
721 mutex_lock(&chip->tpm_mutex);
722 rc = tpm2_load_cmd(chip, payload, options, &blob_handle,
723 TPM_TRANSMIT_UNLOCKED);
724 if (rc)
725 goto out;
726
727 rc = tpm2_unseal_cmd(chip, payload, options, blob_handle,
728 TPM_TRANSMIT_UNLOCKED);
729 tpm2_flush_context_cmd(chip, blob_handle, TPM_TRANSMIT_UNLOCKED);
730 out:
731 mutex_unlock(&chip->tpm_mutex);
732 return rc;
733 }
734
735 /**
736 * tpm2_get_tpm_pt() - get value of a TPM_CAP_TPM_PROPERTIES type property
737 * @chip: TPM chip to use.
738 * @property_id: property ID.
739 * @value: output variable.
740 * @desc: passed to tpm_transmit_cmd()
741 *
742 * Return: Same as with tpm_transmit_cmd.
743 */
744 ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value,
745 const char *desc)
746 {
747 struct tpm2_cmd cmd;
748 int rc;
749
750 cmd.header.in = tpm2_get_tpm_pt_header;
751 cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES);
752 cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(property_id);
753 cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1);
754
755 rc = tpm_transmit_cmd(chip, NULL, &cmd, sizeof(cmd),
756 TPM2_GET_TPM_PT_OUT_BODY_SIZE, 0, desc);
757 if (!rc)
758 *value = be32_to_cpu(cmd.params.get_tpm_pt_out.value);
759
760 return rc;
761 }
762 EXPORT_SYMBOL_GPL(tpm2_get_tpm_pt);
763
764 #define TPM2_SHUTDOWN_IN_SIZE \
765 (sizeof(struct tpm_input_header) + \
766 sizeof(struct tpm2_startup_in))
767
768 static const struct tpm_input_header tpm2_shutdown_header = {
769 .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
770 .length = cpu_to_be32(TPM2_SHUTDOWN_IN_SIZE),
771 .ordinal = cpu_to_be32(TPM2_CC_SHUTDOWN)
772 };
773
774 /**
775 * tpm2_shutdown() - send shutdown command to the TPM chip
776 *
777 * @chip: TPM chip to use.
778 * @shutdown_type: shutdown type. The value is either
779 * TPM_SU_CLEAR or TPM_SU_STATE.
780 */
781 void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type)
782 {
783 struct tpm2_cmd cmd;
784 int rc;
785
786 cmd.header.in = tpm2_shutdown_header;
787 cmd.params.startup_in.startup_type = cpu_to_be16(shutdown_type);
788
789 rc = tpm_transmit_cmd(chip, NULL, &cmd, sizeof(cmd), 0, 0,
790 "stopping the TPM");
791
792 /* In places where shutdown command is sent there's no much we can do
793 * except print the error code on a system failure.
794 */
795 if (rc < 0 && rc != -EPIPE)
796 dev_warn(&chip->dev, "transmit returned %d while stopping the TPM",
797 rc);
798 }
799
800 /*
801 * tpm2_calc_ordinal_duration() - maximum duration for a command
802 *
803 * @chip: TPM chip to use.
804 * @ordinal: command code number.
805 *
806 * Return: maximum duration for a command
807 */
808 unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
809 {
810 int index = TPM_UNDEFINED;
811 int duration = 0;
812
813 if (ordinal >= TPM2_CC_FIRST && ordinal <= TPM2_CC_LAST)
814 index = tpm2_ordinal_duration[ordinal - TPM2_CC_FIRST];
815
816 if (index != TPM_UNDEFINED)
817 duration = chip->duration[index];
818
819 if (duration <= 0)
820 duration = 2 * 60 * HZ;
821
822 return duration;
823 }
824 EXPORT_SYMBOL_GPL(tpm2_calc_ordinal_duration);
825
826 #define TPM2_SELF_TEST_IN_SIZE \
827 (sizeof(struct tpm_input_header) + \
828 sizeof(struct tpm2_self_test_in))
829
830 static const struct tpm_input_header tpm2_selftest_header = {
831 .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
832 .length = cpu_to_be32(TPM2_SELF_TEST_IN_SIZE),
833 .ordinal = cpu_to_be32(TPM2_CC_SELF_TEST)
834 };
835
836 /**
837 * tpm2_do_selftest() - ensure that all self tests have passed
838 *
839 * @chip: TPM chip to use
840 *
841 * Return: Same as with tpm_transmit_cmd.
842 *
843 * The TPM can either run all self tests synchronously and then return
844 * RC_SUCCESS once all tests were successful. Or it can choose to run the tests
845 * asynchronously and return RC_TESTING immediately while the self tests still
846 * execute in the background. This function handles both cases and waits until
847 * all tests have completed.
848 */
849 static int tpm2_do_selftest(struct tpm_chip *chip)
850 {
851 int rc;
852 unsigned int delay_msec = 10;
853 long duration;
854 struct tpm2_cmd cmd;
855
856 duration = jiffies_to_msecs(
857 tpm2_calc_ordinal_duration(chip, TPM2_CC_SELF_TEST));
858
859 while (1) {
860 cmd.header.in = tpm2_selftest_header;
861 cmd.params.selftest_in.full_test = 0;
862
863 rc = tpm_transmit_cmd(chip, NULL, &cmd, TPM2_SELF_TEST_IN_SIZE,
864 0, 0, "continue selftest");
865
866 if (rc != TPM2_RC_TESTING || delay_msec >= duration)
867 break;
868
869 /* wait longer than before */
870 delay_msec *= 2;
871 tpm_msleep(delay_msec);
872 }
873
874 return rc;
875 }
876
877 /**
878 * tpm2_probe() - probe TPM 2.0
879 * @chip: TPM chip to use
880 *
881 * Return: < 0 error and 0 on success.
882 *
883 * Send idempotent TPM 2.0 command and see whether TPM 2.0 chip replied based on
884 * the reply tag.
885 */
886 int tpm2_probe(struct tpm_chip *chip)
887 {
888 struct tpm2_cmd cmd;
889 int rc;
890
891 cmd.header.in = tpm2_get_tpm_pt_header;
892 cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES);
893 cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(0x100);
894 cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1);
895
896 rc = tpm_transmit_cmd(chip, NULL, &cmd, sizeof(cmd), 0, 0, NULL);
897 if (rc < 0)
898 return rc;
899
900 if (be16_to_cpu(cmd.header.out.tag) == TPM2_ST_NO_SESSIONS)
901 chip->flags |= TPM_CHIP_FLAG_TPM2;
902
903 return 0;
904 }
905 EXPORT_SYMBOL_GPL(tpm2_probe);
906
907 struct tpm2_pcr_selection {
908 __be16 hash_alg;
909 u8 size_of_select;
910 u8 pcr_select[3];
911 } __packed;
912
913 static ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip)
914 {
915 struct tpm2_pcr_selection pcr_selection;
916 struct tpm_buf buf;
917 void *marker;
918 void *end;
919 void *pcr_select_offset;
920 unsigned int count;
921 u32 sizeof_pcr_selection;
922 u32 rsp_len;
923 int rc;
924 int i = 0;
925
926 rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY);
927 if (rc)
928 return rc;
929
930 tpm_buf_append_u32(&buf, TPM2_CAP_PCRS);
931 tpm_buf_append_u32(&buf, 0);
932 tpm_buf_append_u32(&buf, 1);
933
934 rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 9, 0,
935 "get tpm pcr allocation");
936 if (rc)
937 goto out;
938
939 count = be32_to_cpup(
940 (__be32 *)&buf.data[TPM_HEADER_SIZE + 5]);
941
942 if (count > ARRAY_SIZE(chip->active_banks)) {
943 rc = -ENODEV;
944 goto out;
945 }
946
947 marker = &buf.data[TPM_HEADER_SIZE + 9];
948
949 rsp_len = be32_to_cpup((__be32 *)&buf.data[2]);
950 end = &buf.data[rsp_len];
951
952 for (i = 0; i < count; i++) {
953 pcr_select_offset = marker +
954 offsetof(struct tpm2_pcr_selection, size_of_select);
955 if (pcr_select_offset >= end) {
956 rc = -EFAULT;
957 break;
958 }
959
960 memcpy(&pcr_selection, marker, sizeof(pcr_selection));
961 chip->active_banks[i] = be16_to_cpu(pcr_selection.hash_alg);
962 sizeof_pcr_selection = sizeof(pcr_selection.hash_alg) +
963 sizeof(pcr_selection.size_of_select) +
964 pcr_selection.size_of_select;
965 marker = marker + sizeof_pcr_selection;
966 }
967
968 out:
969 if (i < ARRAY_SIZE(chip->active_banks))
970 chip->active_banks[i] = TPM2_ALG_ERROR;
971
972 tpm_buf_destroy(&buf);
973
974 return rc;
975 }
976
977 static int tpm2_get_cc_attrs_tbl(struct tpm_chip *chip)
978 {
979 struct tpm_buf buf;
980 u32 nr_commands;
981 __be32 *attrs;
982 u32 cc;
983 int i;
984 int rc;
985
986 rc = tpm2_get_tpm_pt(chip, TPM_PT_TOTAL_COMMANDS, &nr_commands, NULL);
987 if (rc)
988 goto out;
989
990 if (nr_commands > 0xFFFFF) {
991 rc = -EFAULT;
992 goto out;
993 }
994
995 chip->cc_attrs_tbl = devm_kzalloc(&chip->dev, 4 * nr_commands,
996 GFP_KERNEL);
997
998 rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY);
999 if (rc)
1000 goto out;
1001
1002 tpm_buf_append_u32(&buf, TPM2_CAP_COMMANDS);
1003 tpm_buf_append_u32(&buf, TPM2_CC_FIRST);
1004 tpm_buf_append_u32(&buf, nr_commands);
1005
1006 rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE,
1007 9 + 4 * nr_commands, 0, NULL);
1008 if (rc) {
1009 tpm_buf_destroy(&buf);
1010 goto out;
1011 }
1012
1013 if (nr_commands !=
1014 be32_to_cpup((__be32 *)&buf.data[TPM_HEADER_SIZE + 5])) {
1015 tpm_buf_destroy(&buf);
1016 goto out;
1017 }
1018
1019 chip->nr_commands = nr_commands;
1020
1021 attrs = (__be32 *)&buf.data[TPM_HEADER_SIZE + 9];
1022 for (i = 0; i < nr_commands; i++, attrs++) {
1023 chip->cc_attrs_tbl[i] = be32_to_cpup(attrs);
1024 cc = chip->cc_attrs_tbl[i] & 0xFFFF;
1025
1026 if (cc == TPM2_CC_CONTEXT_SAVE || cc == TPM2_CC_FLUSH_CONTEXT) {
1027 chip->cc_attrs_tbl[i] &=
1028 ~(GENMASK(2, 0) << TPM2_CC_ATTR_CHANDLES);
1029 chip->cc_attrs_tbl[i] |= 1 << TPM2_CC_ATTR_CHANDLES;
1030 }
1031 }
1032
1033 tpm_buf_destroy(&buf);
1034
1035 out:
1036 if (rc > 0)
1037 rc = -ENODEV;
1038 return rc;
1039 }
1040
1041 /**
1042 * tpm2_auto_startup - Perform the standard automatic TPM initialization
1043 * sequence
1044 * @chip: TPM chip to use
1045 *
1046 * Returns 0 on success, < 0 in case of fatal error.
1047 */
1048 int tpm2_auto_startup(struct tpm_chip *chip)
1049 {
1050 int rc;
1051
1052 rc = tpm_get_timeouts(chip);
1053 if (rc)
1054 goto out;
1055
1056 rc = tpm2_do_selftest(chip);
1057 if (rc != 0 && rc != TPM2_RC_INITIALIZE) {
1058 dev_err(&chip->dev, "TPM self test failed\n");
1059 goto out;
1060 }
1061
1062 if (rc == TPM2_RC_INITIALIZE) {
1063 rc = tpm_startup(chip);
1064 if (rc)
1065 goto out;
1066
1067 rc = tpm2_do_selftest(chip);
1068 if (rc) {
1069 dev_err(&chip->dev, "TPM self test failed\n");
1070 goto out;
1071 }
1072 }
1073
1074 rc = tpm2_get_pcr_allocation(chip);
1075 if (rc)
1076 goto out;
1077
1078 rc = tpm2_get_cc_attrs_tbl(chip);
1079
1080 out:
1081 if (rc > 0)
1082 rc = -ENODEV;
1083 return rc;
1084 }
1085
1086 int tpm2_find_cc(struct tpm_chip *chip, u32 cc)
1087 {
1088 int i;
1089
1090 for (i = 0; i < chip->nr_commands; i++)
1091 if (cc == (chip->cc_attrs_tbl[i] & GENMASK(15, 0)))
1092 return i;
1093
1094 return -1;
1095 }
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