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Linux 4.18.10
[linux/fpc-iii.git] / drivers / char / tpm / tpm2-cmd.c
blobd31b090992163d12a4f7bda31be1464f6caf66e9
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_get_tpm_pt_in {
35 __be32 cap_id;
36 __be32 property_id;
37 __be32 property_cnt;
38 } __packed;
39
40 struct tpm2_get_tpm_pt_out {
41 u8 more_data;
42 __be32 subcap_id;
43 __be32 property_cnt;
44 __be32 property_id;
45 __be32 value;
46 } __packed;
47
48 struct tpm2_get_random_in {
49 __be16 size;
50 } __packed;
51
52 struct tpm2_get_random_out {
53 __be16 size;
54 u8 buffer[TPM_MAX_RNG_DATA];
55 } __packed;
56
57 union tpm2_cmd_params {
58 struct tpm2_startup_in startup_in;
59 struct tpm2_get_tpm_pt_in get_tpm_pt_in;
60 struct tpm2_get_tpm_pt_out get_tpm_pt_out;
61 struct tpm2_get_random_in getrandom_in;
62 struct tpm2_get_random_out getrandom_out;
63 };
64
65 struct tpm2_cmd {
66 tpm_cmd_header header;
67 union tpm2_cmd_params params;
68 } __packed;
69
70 struct tpm2_hash {
71 unsigned int crypto_id;
72 unsigned int tpm_id;
73 };
74
75 static struct tpm2_hash tpm2_hash_map[] = {
76 {HASH_ALGO_SHA1, TPM2_ALG_SHA1},
77 {HASH_ALGO_SHA256, TPM2_ALG_SHA256},
78 {HASH_ALGO_SHA384, TPM2_ALG_SHA384},
79 {HASH_ALGO_SHA512, TPM2_ALG_SHA512},
80 {HASH_ALGO_SM3_256, TPM2_ALG_SM3_256},
81 };
82
83 /*
84 * Array with one entry per ordinal defining the maximum amount
85 * of time the chip could take to return the result. The values
86 * of the SHORT, MEDIUM, and LONG durations are taken from the
87 * PC Client Profile (PTP) specification.
88 * LONG_LONG is for commands that generates keys which empirically
89 * takes longer time on some systems.
90 */
91 static const u8 tpm2_ordinal_duration[TPM2_CC_LAST - TPM2_CC_FIRST + 1] = {
92 TPM_UNDEFINED, /* 11F */
93 TPM_UNDEFINED, /* 120 */
94 TPM_LONG, /* 121 */
95 TPM_UNDEFINED, /* 122 */
96 TPM_UNDEFINED, /* 123 */
97 TPM_UNDEFINED, /* 124 */
98 TPM_UNDEFINED, /* 125 */
99 TPM_UNDEFINED, /* 126 */
100 TPM_UNDEFINED, /* 127 */
101 TPM_UNDEFINED, /* 128 */
102 TPM_LONG, /* 129 */
103 TPM_UNDEFINED, /* 12a */
104 TPM_UNDEFINED, /* 12b */
105 TPM_UNDEFINED, /* 12c */
106 TPM_UNDEFINED, /* 12d */
107 TPM_UNDEFINED, /* 12e */
108 TPM_UNDEFINED, /* 12f */
109 TPM_UNDEFINED, /* 130 */
110 TPM_LONG_LONG, /* 131 */
111 TPM_UNDEFINED, /* 132 */
112 TPM_UNDEFINED, /* 133 */
113 TPM_UNDEFINED, /* 134 */
114 TPM_UNDEFINED, /* 135 */
115 TPM_UNDEFINED, /* 136 */
116 TPM_UNDEFINED, /* 137 */
117 TPM_UNDEFINED, /* 138 */
118 TPM_UNDEFINED, /* 139 */
119 TPM_UNDEFINED, /* 13a */
120 TPM_UNDEFINED, /* 13b */
121 TPM_UNDEFINED, /* 13c */
122 TPM_UNDEFINED, /* 13d */
123 TPM_MEDIUM, /* 13e */
124 TPM_UNDEFINED, /* 13f */
125 TPM_UNDEFINED, /* 140 */
126 TPM_UNDEFINED, /* 141 */
127 TPM_UNDEFINED, /* 142 */
128 TPM_LONG, /* 143 */
129 TPM_MEDIUM, /* 144 */
130 TPM_UNDEFINED, /* 145 */
131 TPM_UNDEFINED, /* 146 */
132 TPM_UNDEFINED, /* 147 */
133 TPM_UNDEFINED, /* 148 */
134 TPM_UNDEFINED, /* 149 */
135 TPM_UNDEFINED, /* 14a */
136 TPM_UNDEFINED, /* 14b */
137 TPM_UNDEFINED, /* 14c */
138 TPM_UNDEFINED, /* 14d */
139 TPM_LONG, /* 14e */
140 TPM_UNDEFINED, /* 14f */
141 TPM_UNDEFINED, /* 150 */
142 TPM_UNDEFINED, /* 151 */
143 TPM_UNDEFINED, /* 152 */
144 TPM_LONG_LONG, /* 153 */
145 TPM_UNDEFINED, /* 154 */
146 TPM_UNDEFINED, /* 155 */
147 TPM_UNDEFINED, /* 156 */
148 TPM_UNDEFINED, /* 157 */
149 TPM_UNDEFINED, /* 158 */
150 TPM_UNDEFINED, /* 159 */
151 TPM_UNDEFINED, /* 15a */
152 TPM_UNDEFINED, /* 15b */
153 TPM_MEDIUM, /* 15c */
154 TPM_UNDEFINED, /* 15d */
155 TPM_UNDEFINED, /* 15e */
156 TPM_UNDEFINED, /* 15f */
157 TPM_UNDEFINED, /* 160 */
158 TPM_UNDEFINED, /* 161 */
159 TPM_UNDEFINED, /* 162 */
160 TPM_UNDEFINED, /* 163 */
161 TPM_UNDEFINED, /* 164 */
162 TPM_UNDEFINED, /* 165 */
163 TPM_UNDEFINED, /* 166 */
164 TPM_UNDEFINED, /* 167 */
165 TPM_UNDEFINED, /* 168 */
166 TPM_UNDEFINED, /* 169 */
167 TPM_UNDEFINED, /* 16a */
168 TPM_UNDEFINED, /* 16b */
169 TPM_UNDEFINED, /* 16c */
170 TPM_UNDEFINED, /* 16d */
171 TPM_UNDEFINED, /* 16e */
172 TPM_UNDEFINED, /* 16f */
173 TPM_UNDEFINED, /* 170 */
174 TPM_UNDEFINED, /* 171 */
175 TPM_UNDEFINED, /* 172 */
176 TPM_UNDEFINED, /* 173 */
177 TPM_UNDEFINED, /* 174 */
178 TPM_UNDEFINED, /* 175 */
179 TPM_UNDEFINED, /* 176 */
180 TPM_LONG, /* 177 */
181 TPM_UNDEFINED, /* 178 */
182 TPM_UNDEFINED, /* 179 */
183 TPM_MEDIUM, /* 17a */
184 TPM_LONG, /* 17b */
185 TPM_UNDEFINED, /* 17c */
186 TPM_UNDEFINED, /* 17d */
187 TPM_UNDEFINED, /* 17e */
188 TPM_UNDEFINED, /* 17f */
189 TPM_UNDEFINED, /* 180 */
190 TPM_UNDEFINED, /* 181 */
191 TPM_MEDIUM, /* 182 */
192 TPM_UNDEFINED, /* 183 */
193 TPM_UNDEFINED, /* 184 */
194 TPM_MEDIUM, /* 185 */
195 TPM_MEDIUM, /* 186 */
196 TPM_UNDEFINED, /* 187 */
197 TPM_UNDEFINED, /* 188 */
198 TPM_UNDEFINED, /* 189 */
199 TPM_UNDEFINED, /* 18a */
200 TPM_UNDEFINED, /* 18b */
201 TPM_UNDEFINED, /* 18c */
202 TPM_UNDEFINED, /* 18d */
203 TPM_UNDEFINED, /* 18e */
204 TPM_UNDEFINED /* 18f */
205 };
206
207 struct tpm2_pcr_read_out {
208 __be32 update_cnt;
209 __be32 pcr_selects_cnt;
210 __be16 hash_alg;
211 u8 pcr_select_size;
212 u8 pcr_select[TPM2_PCR_SELECT_MIN];
213 __be32 digests_cnt;
214 __be16 digest_size;
215 u8 digest[];
216 } __packed;
217
218 /**
219 * tpm2_pcr_read() - read a PCR value
220 * @chip: TPM chip to use.
221 * @pcr_idx: index of the PCR to read.
222 * @res_buf: buffer to store the resulting hash.
223 *
224 * Return: Same as with tpm_transmit_cmd.
225 */
226 int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
227 {
228 int rc;
229 struct tpm_buf buf;
230 struct tpm2_pcr_read_out *out;
231 u8 pcr_select[TPM2_PCR_SELECT_MIN] = {0};
232
233 if (pcr_idx >= TPM2_PLATFORM_PCR)
234 return -EINVAL;
235
236 rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_PCR_READ);
237 if (rc)
238 return rc;
239
240 pcr_select[pcr_idx >> 3] = 1 << (pcr_idx & 0x7);
241
242 tpm_buf_append_u32(&buf, 1);
243 tpm_buf_append_u16(&buf, TPM2_ALG_SHA1);
244 tpm_buf_append_u8(&buf, TPM2_PCR_SELECT_MIN);
245 tpm_buf_append(&buf, (const unsigned char *)pcr_select,
246 sizeof(pcr_select));
247
248 rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 0, 0,
249 res_buf ? "attempting to read a pcr value" : NULL);
250 if (rc == 0 && res_buf) {
251 out = (struct tpm2_pcr_read_out *)&buf.data[TPM_HEADER_SIZE];
252 memcpy(res_buf, out->digest, SHA1_DIGEST_SIZE);
253 }
254
255 tpm_buf_destroy(&buf);
256 return rc;
257 }
258
259 struct tpm2_null_auth_area {
260 __be32 handle;
261 __be16 nonce_size;
262 u8 attributes;
263 __be16 auth_size;
264 } __packed;
265
266 /**
267 * tpm2_pcr_extend() - extend a PCR value
268 *
269 * @chip: TPM chip to use.
270 * @pcr_idx: index of the PCR.
271 * @count: number of digests passed.
272 * @digests: list of pcr banks and corresponding digest values to extend.
273 *
274 * Return: Same as with tpm_transmit_cmd.
275 */
276 int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, u32 count,
277 struct tpm2_digest *digests)
278 {
279 struct tpm_buf buf;
280 struct tpm2_null_auth_area auth_area;
281 int rc;
282 int i;
283 int j;
284
285 if (count > ARRAY_SIZE(chip->active_banks))
286 return -EINVAL;
287
288 rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_PCR_EXTEND);
289 if (rc)
290 return rc;
291
292 tpm_buf_append_u32(&buf, pcr_idx);
293
294 auth_area.handle = cpu_to_be32(TPM2_RS_PW);
295 auth_area.nonce_size = 0;
296 auth_area.attributes = 0;
297 auth_area.auth_size = 0;
298
299 tpm_buf_append_u32(&buf, sizeof(struct tpm2_null_auth_area));
300 tpm_buf_append(&buf, (const unsigned char *)&auth_area,
301 sizeof(auth_area));
302 tpm_buf_append_u32(&buf, count);
303
304 for (i = 0; i < count; i++) {
305 for (j = 0; j < ARRAY_SIZE(tpm2_hash_map); j++) {
306 if (digests[i].alg_id != tpm2_hash_map[j].tpm_id)
307 continue;
308 tpm_buf_append_u16(&buf, digests[i].alg_id);
309 tpm_buf_append(&buf, (const unsigned char
310 *)&digests[i].digest,
311 hash_digest_size[tpm2_hash_map[j].crypto_id]);
312 }
313 }
314
315 rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 0, 0,
316 "attempting extend a PCR value");
317
318 tpm_buf_destroy(&buf);
319
320 return rc;
321 }
322
323
324 #define TPM2_GETRANDOM_IN_SIZE \
325 (sizeof(struct tpm_input_header) + \
326 sizeof(struct tpm2_get_random_in))
327
328 static const struct tpm_input_header tpm2_getrandom_header = {
329 .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
330 .length = cpu_to_be32(TPM2_GETRANDOM_IN_SIZE),
331 .ordinal = cpu_to_be32(TPM2_CC_GET_RANDOM)
332 };
333
334 /**
335 * tpm2_get_random() - get random bytes from the TPM RNG
336 *
337 * @chip: TPM chip to use
338 * @out: destination buffer for the random bytes
339 * @max: the max number of bytes to write to @out
340 *
341 * Return:
342 * Size of the output buffer, or -EIO on error.
343 */
344 int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max)
345 {
346 struct tpm2_cmd cmd;
347 u32 recd, rlength;
348 u32 num_bytes;
349 int err;
350 int total = 0;
351 int retries = 5;
352 u8 *dest = out;
353
354 num_bytes = min_t(u32, max, sizeof(cmd.params.getrandom_out.buffer));
355
356 if (!out || !num_bytes ||
357 max > sizeof(cmd.params.getrandom_out.buffer))
358 return -EINVAL;
359
360 do {
361 cmd.header.in = tpm2_getrandom_header;
362 cmd.params.getrandom_in.size = cpu_to_be16(num_bytes);
363
364 err = tpm_transmit_cmd(chip, NULL, &cmd, sizeof(cmd),
365 offsetof(struct tpm2_get_random_out,
366 buffer),
367 0, "attempting get random");
368 if (err)
369 break;
370
371 recd = min_t(u32, be16_to_cpu(cmd.params.getrandom_out.size),
372 num_bytes);
373 rlength = be32_to_cpu(cmd.header.out.length);
374 if (rlength < offsetof(struct tpm2_get_random_out, buffer) +
375 recd)
376 return -EFAULT;
377 memcpy(dest, cmd.params.getrandom_out.buffer, recd);
378
379 dest += recd;
380 total += recd;
381 num_bytes -= recd;
382 } while (retries-- && total < max);
383
384 return total ? total : -EIO;
385 }
386
387 #define TPM2_GET_TPM_PT_IN_SIZE \
388 (sizeof(struct tpm_input_header) + \
389 sizeof(struct tpm2_get_tpm_pt_in))
390
391 #define TPM2_GET_TPM_PT_OUT_BODY_SIZE \
392 sizeof(struct tpm2_get_tpm_pt_out)
393
394 static const struct tpm_input_header tpm2_get_tpm_pt_header = {
395 .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
396 .length = cpu_to_be32(TPM2_GET_TPM_PT_IN_SIZE),
397 .ordinal = cpu_to_be32(TPM2_CC_GET_CAPABILITY)
398 };
399
400 /**
401 * tpm2_flush_context_cmd() - execute a TPM2_FlushContext command
402 * @chip: TPM chip to use
403 * @payload: the key data in clear and encrypted form
404 * @options: authentication values and other options
405 *
406 * Return: same as with tpm_transmit_cmd
407 */
408 void tpm2_flush_context_cmd(struct tpm_chip *chip, u32 handle,
409 unsigned int flags)
410 {
411 struct tpm_buf buf;
412 int rc;
413
414 rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_FLUSH_CONTEXT);
415 if (rc) {
416 dev_warn(&chip->dev, "0x%08x was not flushed, out of memory\n",
417 handle);
418 return;
419 }
420
421 tpm_buf_append_u32(&buf, handle);
422
423 (void) tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 0, flags,
424 "flushing context");
425
426 tpm_buf_destroy(&buf);
427 }
428
429 /**
430 * tpm_buf_append_auth() - append TPMS_AUTH_COMMAND to the buffer.
431 *
432 * @buf: an allocated tpm_buf instance
433 * @session_handle: session handle
434 * @nonce: the session nonce, may be NULL if not used
435 * @nonce_len: the session nonce length, may be 0 if not used
436 * @attributes: the session attributes
437 * @hmac: the session HMAC or password, may be NULL if not used
438 * @hmac_len: the session HMAC or password length, maybe 0 if not used
439 */
440 static void tpm2_buf_append_auth(struct tpm_buf *buf, u32 session_handle,
441 const u8 *nonce, u16 nonce_len,
442 u8 attributes,
443 const u8 *hmac, u16 hmac_len)
444 {
445 tpm_buf_append_u32(buf, 9 + nonce_len + hmac_len);
446 tpm_buf_append_u32(buf, session_handle);
447 tpm_buf_append_u16(buf, nonce_len);
448
449 if (nonce && nonce_len)
450 tpm_buf_append(buf, nonce, nonce_len);
451
452 tpm_buf_append_u8(buf, attributes);
453 tpm_buf_append_u16(buf, hmac_len);
454
455 if (hmac && hmac_len)
456 tpm_buf_append(buf, hmac, hmac_len);
457 }
458
459 /**
460 * tpm2_seal_trusted() - seal the payload of a trusted key
461 *
462 * @chip: TPM chip to use
463 * @payload: the key data in clear and encrypted form
464 * @options: authentication values and other options
465 *
466 * Return: < 0 on error and 0 on success.
467 */
468 int tpm2_seal_trusted(struct tpm_chip *chip,
469 struct trusted_key_payload *payload,
470 struct trusted_key_options *options)
471 {
472 unsigned int blob_len;
473 struct tpm_buf buf;
474 u32 hash, rlength;
475 int i;
476 int rc;
477
478 for (i = 0; i < ARRAY_SIZE(tpm2_hash_map); i++) {
479 if (options->hash == tpm2_hash_map[i].crypto_id) {
480 hash = tpm2_hash_map[i].tpm_id;
481 break;
482 }
483 }
484
485 if (i == ARRAY_SIZE(tpm2_hash_map))
486 return -EINVAL;
487
488 rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_CREATE);
489 if (rc)
490 return rc;
491
492 tpm_buf_append_u32(&buf, options->keyhandle);
493 tpm2_buf_append_auth(&buf, TPM2_RS_PW,
494 NULL /* nonce */, 0,
495 0 /* session_attributes */,
496 options->keyauth /* hmac */,
497 TPM_DIGEST_SIZE);
498
499 /* sensitive */
500 tpm_buf_append_u16(&buf, 4 + TPM_DIGEST_SIZE + payload->key_len + 1);
501
502 tpm_buf_append_u16(&buf, TPM_DIGEST_SIZE);
503 tpm_buf_append(&buf, options->blobauth, TPM_DIGEST_SIZE);
504 tpm_buf_append_u16(&buf, payload->key_len + 1);
505 tpm_buf_append(&buf, payload->key, payload->key_len);
506 tpm_buf_append_u8(&buf, payload->migratable);
507
508 /* public */
509 tpm_buf_append_u16(&buf, 14 + options->policydigest_len);
510 tpm_buf_append_u16(&buf, TPM2_ALG_KEYEDHASH);
511 tpm_buf_append_u16(&buf, hash);
512
513 /* policy */
514 if (options->policydigest_len) {
515 tpm_buf_append_u32(&buf, 0);
516 tpm_buf_append_u16(&buf, options->policydigest_len);
517 tpm_buf_append(&buf, options->policydigest,
518 options->policydigest_len);
519 } else {
520 tpm_buf_append_u32(&buf, TPM2_OA_USER_WITH_AUTH);
521 tpm_buf_append_u16(&buf, 0);
522 }
523
524 /* public parameters */
525 tpm_buf_append_u16(&buf, TPM2_ALG_NULL);
526 tpm_buf_append_u16(&buf, 0);
527
528 /* outside info */
529 tpm_buf_append_u16(&buf, 0);
530
531 /* creation PCR */
532 tpm_buf_append_u32(&buf, 0);
533
534 if (buf.flags & TPM_BUF_OVERFLOW) {
535 rc = -E2BIG;
536 goto out;
537 }
538
539 rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 4, 0,
540 "sealing data");
541 if (rc)
542 goto out;
543
544 blob_len = be32_to_cpup((__be32 *) &buf.data[TPM_HEADER_SIZE]);
545 if (blob_len > MAX_BLOB_SIZE) {
546 rc = -E2BIG;
547 goto out;
548 }
549 rlength = be32_to_cpu(((struct tpm2_cmd *)&buf)->header.out.length);
550 if (rlength < TPM_HEADER_SIZE + 4 + blob_len) {
551 rc = -EFAULT;
552 goto out;
553 }
554
555 memcpy(payload->blob, &buf.data[TPM_HEADER_SIZE + 4], blob_len);
556 payload->blob_len = blob_len;
557
558 out:
559 tpm_buf_destroy(&buf);
560
561 if (rc > 0) {
562 if (tpm2_rc_value(rc) == TPM2_RC_HASH)
563 rc = -EINVAL;
564 else
565 rc = -EPERM;
566 }
567
568 return rc;
569 }
570
571 /**
572 * tpm2_load_cmd() - execute a TPM2_Load command
573 *
574 * @chip: TPM chip to use
575 * @payload: the key data in clear and encrypted form
576 * @options: authentication values and other options
577 * @blob_handle: returned blob handle
578 * @flags: tpm transmit flags
579 *
580 * Return: 0 on success.
581 * -E2BIG on wrong payload size.
582 * -EPERM on tpm error status.
583 * < 0 error from tpm_transmit_cmd.
584 */
585 static int tpm2_load_cmd(struct tpm_chip *chip,
586 struct trusted_key_payload *payload,
587 struct trusted_key_options *options,
588 u32 *blob_handle, unsigned int flags)
589 {
590 struct tpm_buf buf;
591 unsigned int private_len;
592 unsigned int public_len;
593 unsigned int blob_len;
594 int rc;
595
596 private_len = be16_to_cpup((__be16 *) &payload->blob[0]);
597 if (private_len > (payload->blob_len - 2))
598 return -E2BIG;
599
600 public_len = be16_to_cpup((__be16 *) &payload->blob[2 + private_len]);
601 blob_len = private_len + public_len + 4;
602 if (blob_len > payload->blob_len)
603 return -E2BIG;
604
605 rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_LOAD);
606 if (rc)
607 return rc;
608
609 tpm_buf_append_u32(&buf, options->keyhandle);
610 tpm2_buf_append_auth(&buf, TPM2_RS_PW,
611 NULL /* nonce */, 0,
612 0 /* session_attributes */,
613 options->keyauth /* hmac */,
614 TPM_DIGEST_SIZE);
615
616 tpm_buf_append(&buf, payload->blob, blob_len);
617
618 if (buf.flags & TPM_BUF_OVERFLOW) {
619 rc = -E2BIG;
620 goto out;
621 }
622
623 rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 4, flags,
624 "loading blob");
625 if (!rc)
626 *blob_handle = be32_to_cpup(
627 (__be32 *) &buf.data[TPM_HEADER_SIZE]);
628
629 out:
630 tpm_buf_destroy(&buf);
631
632 if (rc > 0)
633 rc = -EPERM;
634
635 return rc;
636 }
637
638 /**
639 * tpm2_unseal_cmd() - execute a TPM2_Unload command
640 *
641 * @chip: TPM chip to use
642 * @payload: the key data in clear and encrypted form
643 * @options: authentication values and other options
644 * @blob_handle: blob handle
645 * @flags: tpm_transmit_cmd flags
646 *
647 * Return: 0 on success
648 * -EPERM on tpm error status
649 * < 0 error from tpm_transmit_cmd
650 */
651 static int tpm2_unseal_cmd(struct tpm_chip *chip,
652 struct trusted_key_payload *payload,
653 struct trusted_key_options *options,
654 u32 blob_handle, unsigned int flags)
655 {
656 struct tpm_buf buf;
657 u16 data_len;
658 u8 *data;
659 int rc;
660 u32 rlength;
661
662 rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_UNSEAL);
663 if (rc)
664 return rc;
665
666 tpm_buf_append_u32(&buf, blob_handle);
667 tpm2_buf_append_auth(&buf,
668 options->policyhandle ?
669 options->policyhandle : TPM2_RS_PW,
670 NULL /* nonce */, 0,
671 TPM2_SA_CONTINUE_SESSION,
672 options->blobauth /* hmac */,
673 TPM_DIGEST_SIZE);
674
675 rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 6, flags,
676 "unsealing");
677 if (rc > 0)
678 rc = -EPERM;
679
680 if (!rc) {
681 data_len = be16_to_cpup(
682 (__be16 *) &buf.data[TPM_HEADER_SIZE + 4]);
683 if (data_len < MIN_KEY_SIZE || data_len > MAX_KEY_SIZE + 1) {
684 rc = -EFAULT;
685 goto out;
686 }
687
688 rlength = be32_to_cpu(((struct tpm2_cmd *)&buf)
689 ->header.out.length);
690 if (rlength < TPM_HEADER_SIZE + 6 + data_len) {
691 rc = -EFAULT;
692 goto out;
693 }
694 data = &buf.data[TPM_HEADER_SIZE + 6];
695
696 memcpy(payload->key, data, data_len - 1);
697 payload->key_len = data_len - 1;
698 payload->migratable = data[data_len - 1];
699 }
700
701 out:
702 tpm_buf_destroy(&buf);
703 return rc;
704 }
705
706 /**
707 * tpm2_unseal_trusted() - unseal the payload of a trusted key
708 *
709 * @chip: TPM chip to use
710 * @payload: the key data in clear and encrypted form
711 * @options: authentication values and other options
712 *
713 * Return: Same as with tpm_transmit_cmd.
714 */
715 int tpm2_unseal_trusted(struct tpm_chip *chip,
716 struct trusted_key_payload *payload,
717 struct trusted_key_options *options)
718 {
719 u32 blob_handle;
720 int rc;
721
722 mutex_lock(&chip->tpm_mutex);
723 rc = tpm2_load_cmd(chip, payload, options, &blob_handle,
724 TPM_TRANSMIT_UNLOCKED);
725 if (rc)
726 goto out;
727
728 rc = tpm2_unseal_cmd(chip, payload, options, blob_handle,
729 TPM_TRANSMIT_UNLOCKED);
730 tpm2_flush_context_cmd(chip, blob_handle, TPM_TRANSMIT_UNLOCKED);
731 out:
732 mutex_unlock(&chip->tpm_mutex);
733 return rc;
734 }
735
736 /**
737 * tpm2_get_tpm_pt() - get value of a TPM_CAP_TPM_PROPERTIES type property
738 * @chip: TPM chip to use.
739 * @property_id: property ID.
740 * @value: output variable.
741 * @desc: passed to tpm_transmit_cmd()
742 *
743 * Return: Same as with tpm_transmit_cmd.
744 */
745 ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value,
746 const char *desc)
747 {
748 struct tpm2_cmd cmd;
749 int rc;
750
751 cmd.header.in = tpm2_get_tpm_pt_header;
752 cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES);
753 cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(property_id);
754 cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1);
755
756 rc = tpm_transmit_cmd(chip, NULL, &cmd, sizeof(cmd),
757 TPM2_GET_TPM_PT_OUT_BODY_SIZE, 0, desc);
758 if (!rc)
759 *value = be32_to_cpu(cmd.params.get_tpm_pt_out.value);
760
761 return rc;
762 }
763 EXPORT_SYMBOL_GPL(tpm2_get_tpm_pt);
764
765 #define TPM2_SHUTDOWN_IN_SIZE \
766 (sizeof(struct tpm_input_header) + \
767 sizeof(struct tpm2_startup_in))
768
769 static const struct tpm_input_header tpm2_shutdown_header = {
770 .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
771 .length = cpu_to_be32(TPM2_SHUTDOWN_IN_SIZE),
772 .ordinal = cpu_to_be32(TPM2_CC_SHUTDOWN)
773 };
774
775 /**
776 * tpm2_shutdown() - send shutdown command to the TPM chip
777 *
778 * @chip: TPM chip to use.
779 * @shutdown_type: shutdown type. The value is either
780 * TPM_SU_CLEAR or TPM_SU_STATE.
781 */
782 void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type)
783 {
784 struct tpm2_cmd cmd;
785 int rc;
786
787 cmd.header.in = tpm2_shutdown_header;
788 cmd.params.startup_in.startup_type = cpu_to_be16(shutdown_type);
789
790 rc = tpm_transmit_cmd(chip, NULL, &cmd, sizeof(cmd), 0, 0,
791 "stopping the TPM");
792
793 /* In places where shutdown command is sent there's no much we can do
794 * except print the error code on a system failure.
795 */
796 if (rc < 0 && rc != -EPIPE)
797 dev_warn(&chip->dev, "transmit returned %d while stopping the TPM",
798 rc);
799 }
800
801 /*
802 * tpm2_calc_ordinal_duration() - maximum duration for a command
803 *
804 * @chip: TPM chip to use.
805 * @ordinal: command code number.
806 *
807 * Return: maximum duration for a command
808 */
809 unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
810 {
811 int index = TPM_UNDEFINED;
812 int duration = 0;
813
814 if (ordinal >= TPM2_CC_FIRST && ordinal <= TPM2_CC_LAST)
815 index = tpm2_ordinal_duration[ordinal - TPM2_CC_FIRST];
816
817 if (index != TPM_UNDEFINED)
818 duration = chip->duration[index];
819
820 if (duration <= 0)
821 duration = msecs_to_jiffies(TPM2_DURATION_DEFAULT);
822
823 return duration;
824 }
825 EXPORT_SYMBOL_GPL(tpm2_calc_ordinal_duration);
826
827 /**
828 * tpm2_do_selftest() - ensure that all self tests have passed
829 *
830 * @chip: TPM chip to use
831 *
832 * Return: Same as with tpm_transmit_cmd.
833 *
834 * The TPM can either run all self tests synchronously and then return
835 * RC_SUCCESS once all tests were successful. Or it can choose to run the tests
836 * asynchronously and return RC_TESTING immediately while the self tests still
837 * execute in the background. This function handles both cases and waits until
838 * all tests have completed.
839 */
840 static int tpm2_do_selftest(struct tpm_chip *chip)
841 {
842 struct tpm_buf buf;
843 int full;
844 int rc;
845
846 for (full = 0; full < 2; full++) {
847 rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_SELF_TEST);
848 if (rc)
849 return rc;
850
851 tpm_buf_append_u8(&buf, full);
852 rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 0, 0,
853 "attempting the self test");
854 tpm_buf_destroy(&buf);
855
856 if (rc == TPM2_RC_TESTING)
857 rc = TPM2_RC_SUCCESS;
858 if (rc == TPM2_RC_INITIALIZE || rc == TPM2_RC_SUCCESS)
859 return rc;
860 }
861
862 return rc;
863 }
864
865 /**
866 * tpm2_probe() - probe TPM 2.0
867 * @chip: TPM chip to use
868 *
869 * Return: < 0 error and 0 on success.
870 *
871 * Send idempotent TPM 2.0 command and see whether TPM 2.0 chip replied based on
872 * the reply tag.
873 */
874 int tpm2_probe(struct tpm_chip *chip)
875 {
876 struct tpm2_cmd cmd;
877 int rc;
878
879 cmd.header.in = tpm2_get_tpm_pt_header;
880 cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES);
881 cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(0x100);
882 cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1);
883
884 rc = tpm_transmit_cmd(chip, NULL, &cmd, sizeof(cmd), 0, 0, NULL);
885 if (rc < 0)
886 return rc;
887
888 if (be16_to_cpu(cmd.header.out.tag) == TPM2_ST_NO_SESSIONS)
889 chip->flags |= TPM_CHIP_FLAG_TPM2;
890
891 return 0;
892 }
893 EXPORT_SYMBOL_GPL(tpm2_probe);
894
895 struct tpm2_pcr_selection {
896 __be16 hash_alg;
897 u8 size_of_select;
898 u8 pcr_select[3];
899 } __packed;
900
901 static ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip)
902 {
903 struct tpm2_pcr_selection pcr_selection;
904 struct tpm_buf buf;
905 void *marker;
906 void *end;
907 void *pcr_select_offset;
908 unsigned int count;
909 u32 sizeof_pcr_selection;
910 u32 rsp_len;
911 int rc;
912 int i = 0;
913
914 rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY);
915 if (rc)
916 return rc;
917
918 tpm_buf_append_u32(&buf, TPM2_CAP_PCRS);
919 tpm_buf_append_u32(&buf, 0);
920 tpm_buf_append_u32(&buf, 1);
921
922 rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 9, 0,
923 "get tpm pcr allocation");
924 if (rc)
925 goto out;
926
927 count = be32_to_cpup(
928 (__be32 *)&buf.data[TPM_HEADER_SIZE + 5]);
929
930 if (count > ARRAY_SIZE(chip->active_banks)) {
931 rc = -ENODEV;
932 goto out;
933 }
934
935 marker = &buf.data[TPM_HEADER_SIZE + 9];
936
937 rsp_len = be32_to_cpup((__be32 *)&buf.data[2]);
938 end = &buf.data[rsp_len];
939
940 for (i = 0; i < count; i++) {
941 pcr_select_offset = marker +
942 offsetof(struct tpm2_pcr_selection, size_of_select);
943 if (pcr_select_offset >= end) {
944 rc = -EFAULT;
945 break;
946 }
947
948 memcpy(&pcr_selection, marker, sizeof(pcr_selection));
949 chip->active_banks[i] = be16_to_cpu(pcr_selection.hash_alg);
950 sizeof_pcr_selection = sizeof(pcr_selection.hash_alg) +
951 sizeof(pcr_selection.size_of_select) +
952 pcr_selection.size_of_select;
953 marker = marker + sizeof_pcr_selection;
954 }
955
956 out:
957 if (i < ARRAY_SIZE(chip->active_banks))
958 chip->active_banks[i] = TPM2_ALG_ERROR;
959
960 tpm_buf_destroy(&buf);
961
962 return rc;
963 }
964
965 static int tpm2_get_cc_attrs_tbl(struct tpm_chip *chip)
966 {
967 struct tpm_buf buf;
968 u32 nr_commands;
969 __be32 *attrs;
970 u32 cc;
971 int i;
972 int rc;
973
974 rc = tpm2_get_tpm_pt(chip, TPM_PT_TOTAL_COMMANDS, &nr_commands, NULL);
975 if (rc)
976 goto out;
977
978 if (nr_commands > 0xFFFFF) {
979 rc = -EFAULT;
980 goto out;
981 }
982
983 chip->cc_attrs_tbl = devm_kcalloc(&chip->dev, 4, nr_commands,
984 GFP_KERNEL);
985
986 rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY);
987 if (rc)
988 goto out;
989
990 tpm_buf_append_u32(&buf, TPM2_CAP_COMMANDS);
991 tpm_buf_append_u32(&buf, TPM2_CC_FIRST);
992 tpm_buf_append_u32(&buf, nr_commands);
993
994 rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE,
995 9 + 4 * nr_commands, 0, NULL);
996 if (rc) {
997 tpm_buf_destroy(&buf);
998 goto out;
999 }
1000
1001 if (nr_commands !=
1002 be32_to_cpup((__be32 *)&buf.data[TPM_HEADER_SIZE + 5])) {
1003 tpm_buf_destroy(&buf);
1004 goto out;
1005 }
1006
1007 chip->nr_commands = nr_commands;
1008
1009 attrs = (__be32 *)&buf.data[TPM_HEADER_SIZE + 9];
1010 for (i = 0; i < nr_commands; i++, attrs++) {
1011 chip->cc_attrs_tbl[i] = be32_to_cpup(attrs);
1012 cc = chip->cc_attrs_tbl[i] & 0xFFFF;
1013
1014 if (cc == TPM2_CC_CONTEXT_SAVE || cc == TPM2_CC_FLUSH_CONTEXT) {
1015 chip->cc_attrs_tbl[i] &=
1016 ~(GENMASK(2, 0) << TPM2_CC_ATTR_CHANDLES);
1017 chip->cc_attrs_tbl[i] |= 1 << TPM2_CC_ATTR_CHANDLES;
1018 }
1019 }
1020
1021 tpm_buf_destroy(&buf);
1022
1023 out:
1024 if (rc > 0)
1025 rc = -ENODEV;
1026 return rc;
1027 }
1028
1029 /**
1030 * tpm2_auto_startup - Perform the standard automatic TPM initialization
1031 * sequence
1032 * @chip: TPM chip to use
1033 *
1034 * Returns 0 on success, < 0 in case of fatal error.
1035 */
1036 int tpm2_auto_startup(struct tpm_chip *chip)
1037 {
1038 int rc;
1039
1040 rc = tpm_get_timeouts(chip);
1041 if (rc)
1042 goto out;
1043
1044 rc = tpm2_do_selftest(chip);
1045 if (rc && rc != TPM2_RC_INITIALIZE)
1046 goto out;
1047
1048 if (rc == TPM2_RC_INITIALIZE) {
1049 rc = tpm_startup(chip);
1050 if (rc)
1051 goto out;
1052
1053 rc = tpm2_do_selftest(chip);
1054 if (rc)
1055 goto out;
1056 }
1057
1058 rc = tpm2_get_pcr_allocation(chip);
1059 if (rc)
1060 goto out;
1061
1062 rc = tpm2_get_cc_attrs_tbl(chip);
1063
1064 out:
1065 if (rc > 0)
1066 rc = -ENODEV;
1067 return rc;
1068 }
1069
1070 int tpm2_find_cc(struct tpm_chip *chip, u32 cc)
1071 {
1072 int i;
1073
1074 for (i = 0; i < chip->nr_commands; i++)
1075 if (cc == (chip->cc_attrs_tbl[i] & GENMASK(15, 0)))
1076 return i;
1077
1078 return -1;
1079 }
Linux with added FPC-III support