]>
Commit | Line | Data |
---|---|---|
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 | ||
22 | enum tpm2_object_attributes { | |
c0b5eed1 JS |
23 | TPM2_OA_USER_WITH_AUTH = BIT(6), |
24 | }; | |
25 | ||
26 | enum tpm2_session_attributes { | |
27 | TPM2_SA_CONTINUE_SESSION = BIT(0), | |
954650ef | 28 | }; |
7a1d7e6d JS |
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 | ||
5ca4c20c JS |
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 | ||
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 | */ | |
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 | ||
c659af78 SB |
251 | #define TPM2_PCR_READ_RESP_BODY_SIZE \ |
252 | sizeof(struct tpm2_pcr_read_out) | |
253 | ||
7a1d7e6d JS |
254 | static const struct tpm_input_header tpm2_pcrread_header = { |
255 | .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS), | |
256 | .length = cpu_to_be32(TPM2_PCR_READ_IN_SIZE), | |
257 | .ordinal = cpu_to_be32(TPM2_CC_PCR_READ) | |
258 | }; | |
259 | ||
260 | /** | |
261 | * tpm2_pcr_read() - read a PCR value | |
262 | * @chip: TPM chip to use. | |
263 | * @pcr_idx: index of the PCR to read. | |
794c6e10 | 264 | * @res_buf: buffer to store the resulting hash. |
7a1d7e6d | 265 | * |
794c6e10 | 266 | * Return: Same as with tpm_transmit_cmd. |
7a1d7e6d JS |
267 | */ |
268 | int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf) | |
269 | { | |
270 | int rc; | |
271 | struct tpm2_cmd cmd; | |
272 | u8 *buf; | |
273 | ||
274 | if (pcr_idx >= TPM2_PLATFORM_PCR) | |
275 | return -EINVAL; | |
276 | ||
277 | cmd.header.in = tpm2_pcrread_header; | |
278 | cmd.params.pcrread_in.pcr_selects_cnt = cpu_to_be32(1); | |
279 | cmd.params.pcrread_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1); | |
280 | cmd.params.pcrread_in.pcr_select_size = TPM2_PCR_SELECT_MIN; | |
281 | ||
282 | memset(cmd.params.pcrread_in.pcr_select, 0, | |
283 | sizeof(cmd.params.pcrread_in.pcr_select)); | |
284 | cmd.params.pcrread_in.pcr_select[pcr_idx >> 3] = 1 << (pcr_idx & 0x7); | |
285 | ||
c659af78 SB |
286 | rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), |
287 | TPM2_PCR_READ_RESP_BODY_SIZE, | |
288 | 0, "attempting to read a pcr value"); | |
7a1d7e6d JS |
289 | if (rc == 0) { |
290 | buf = cmd.params.pcrread_out.digest; | |
291 | memcpy(res_buf, buf, TPM_DIGEST_SIZE); | |
292 | } | |
293 | ||
294 | return rc; | |
295 | } | |
296 | ||
297 | #define TPM2_GET_PCREXTEND_IN_SIZE \ | |
298 | (sizeof(struct tpm_input_header) + \ | |
299 | sizeof(struct tpm2_pcr_extend_in)) | |
300 | ||
301 | static const struct tpm_input_header tpm2_pcrextend_header = { | |
302 | .tag = cpu_to_be16(TPM2_ST_SESSIONS), | |
303 | .length = cpu_to_be32(TPM2_GET_PCREXTEND_IN_SIZE), | |
304 | .ordinal = cpu_to_be32(TPM2_CC_PCR_EXTEND) | |
305 | }; | |
306 | ||
307 | /** | |
308 | * tpm2_pcr_extend() - extend a PCR value | |
794c6e10 | 309 | * |
7a1d7e6d JS |
310 | * @chip: TPM chip to use. |
311 | * @pcr_idx: index of the PCR. | |
312 | * @hash: hash value to use for the extend operation. | |
313 | * | |
794c6e10 | 314 | * Return: Same as with tpm_transmit_cmd. |
7a1d7e6d JS |
315 | */ |
316 | int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash) | |
317 | { | |
318 | struct tpm2_cmd cmd; | |
319 | int rc; | |
320 | ||
321 | cmd.header.in = tpm2_pcrextend_header; | |
322 | cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx); | |
323 | cmd.params.pcrextend_in.auth_area_size = | |
324 | cpu_to_be32(sizeof(struct tpm2_null_auth_area)); | |
325 | cmd.params.pcrextend_in.auth_area.handle = | |
326 | cpu_to_be32(TPM2_RS_PW); | |
327 | cmd.params.pcrextend_in.auth_area.nonce_size = 0; | |
328 | cmd.params.pcrextend_in.auth_area.attributes = 0; | |
329 | cmd.params.pcrextend_in.auth_area.auth_size = 0; | |
330 | cmd.params.pcrextend_in.digest_cnt = cpu_to_be32(1); | |
331 | cmd.params.pcrextend_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1); | |
332 | memcpy(cmd.params.pcrextend_in.digest, hash, TPM_DIGEST_SIZE); | |
333 | ||
c659af78 | 334 | rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, 0, |
7a1d7e6d JS |
335 | "attempting extend a PCR value"); |
336 | ||
337 | return rc; | |
338 | } | |
339 | ||
340 | #define TPM2_GETRANDOM_IN_SIZE \ | |
341 | (sizeof(struct tpm_input_header) + \ | |
342 | sizeof(struct tpm2_get_random_in)) | |
343 | ||
344 | static const struct tpm_input_header tpm2_getrandom_header = { | |
345 | .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS), | |
346 | .length = cpu_to_be32(TPM2_GETRANDOM_IN_SIZE), | |
347 | .ordinal = cpu_to_be32(TPM2_CC_GET_RANDOM) | |
348 | }; | |
349 | ||
350 | /** | |
351 | * tpm2_get_random() - get random bytes from the TPM RNG | |
794c6e10 | 352 | * |
7a1d7e6d JS |
353 | * @chip: TPM chip to use |
354 | * @out: destination buffer for the random bytes | |
355 | * @max: the max number of bytes to write to @out | |
356 | * | |
794c6e10 WT |
357 | * Return: |
358 | * Size of the output buffer, or -EIO on error. | |
7a1d7e6d JS |
359 | */ |
360 | int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max) | |
361 | { | |
362 | struct tpm2_cmd cmd; | |
c659af78 | 363 | u32 recd, rlength; |
7a1d7e6d JS |
364 | u32 num_bytes; |
365 | int err; | |
366 | int total = 0; | |
367 | int retries = 5; | |
368 | u8 *dest = out; | |
369 | ||
370 | num_bytes = min_t(u32, max, sizeof(cmd.params.getrandom_out.buffer)); | |
371 | ||
372 | if (!out || !num_bytes || | |
373 | max > sizeof(cmd.params.getrandom_out.buffer)) | |
374 | return -EINVAL; | |
375 | ||
376 | do { | |
377 | cmd.header.in = tpm2_getrandom_header; | |
378 | cmd.params.getrandom_in.size = cpu_to_be16(num_bytes); | |
379 | ||
c659af78 SB |
380 | err = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), |
381 | offsetof(struct tpm2_get_random_out, | |
382 | buffer), | |
383 | 0, "attempting get random"); | |
7a1d7e6d JS |
384 | if (err) |
385 | break; | |
386 | ||
387 | recd = min_t(u32, be16_to_cpu(cmd.params.getrandom_out.size), | |
388 | num_bytes); | |
c659af78 SB |
389 | rlength = be32_to_cpu(cmd.header.out.length); |
390 | if (rlength < offsetof(struct tpm2_get_random_out, buffer) + | |
391 | recd) | |
392 | return -EFAULT; | |
7a1d7e6d JS |
393 | memcpy(dest, cmd.params.getrandom_out.buffer, recd); |
394 | ||
395 | dest += recd; | |
396 | total += recd; | |
397 | num_bytes -= recd; | |
398 | } while (retries-- && total < max); | |
399 | ||
400 | return total ? total : -EIO; | |
401 | } | |
402 | ||
403 | #define TPM2_GET_TPM_PT_IN_SIZE \ | |
404 | (sizeof(struct tpm_input_header) + \ | |
405 | sizeof(struct tpm2_get_tpm_pt_in)) | |
406 | ||
c659af78 SB |
407 | #define TPM2_GET_TPM_PT_OUT_BODY_SIZE \ |
408 | sizeof(struct tpm2_get_tpm_pt_out) | |
409 | ||
7a1d7e6d JS |
410 | static const struct tpm_input_header tpm2_get_tpm_pt_header = { |
411 | .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS), | |
412 | .length = cpu_to_be32(TPM2_GET_TPM_PT_IN_SIZE), | |
413 | .ordinal = cpu_to_be32(TPM2_CC_GET_CAPABILITY) | |
414 | }; | |
415 | ||
954650ef | 416 | /** |
794c6e10 WT |
417 | * tpm_buf_append_auth() - append TPMS_AUTH_COMMAND to the buffer. |
418 | * | |
419 | * @buf: an allocated tpm_buf instance | |
420 | * @session_handle: session handle | |
421 | * @nonce: the session nonce, may be NULL if not used | |
422 | * @nonce_len: the session nonce length, may be 0 if not used | |
423 | * @attributes: the session attributes | |
424 | * @hmac: the session HMAC or password, may be NULL if not used | |
425 | * @hmac_len: the session HMAC or password length, maybe 0 if not used | |
954650ef JS |
426 | */ |
427 | static void tpm2_buf_append_auth(struct tpm_buf *buf, u32 session_handle, | |
428 | const u8 *nonce, u16 nonce_len, | |
429 | u8 attributes, | |
430 | const u8 *hmac, u16 hmac_len) | |
431 | { | |
432 | tpm_buf_append_u32(buf, 9 + nonce_len + hmac_len); | |
433 | tpm_buf_append_u32(buf, session_handle); | |
434 | tpm_buf_append_u16(buf, nonce_len); | |
435 | ||
436 | if (nonce && nonce_len) | |
437 | tpm_buf_append(buf, nonce, nonce_len); | |
438 | ||
439 | tpm_buf_append_u8(buf, attributes); | |
440 | tpm_buf_append_u16(buf, hmac_len); | |
441 | ||
442 | if (hmac && hmac_len) | |
443 | tpm_buf_append(buf, hmac, hmac_len); | |
444 | } | |
445 | ||
446 | /** | |
d4816edf | 447 | * tpm2_seal_trusted() - seal the payload of a trusted key |
794c6e10 WT |
448 | * |
449 | * @chip: TPM chip to use | |
954650ef | 450 | * @payload: the key data in clear and encrypted form |
d4816edf | 451 | * @options: authentication values and other options |
954650ef | 452 | * |
d4816edf | 453 | * Return: < 0 on error and 0 on success. |
954650ef JS |
454 | */ |
455 | int tpm2_seal_trusted(struct tpm_chip *chip, | |
456 | struct trusted_key_payload *payload, | |
457 | struct trusted_key_options *options) | |
458 | { | |
459 | unsigned int blob_len; | |
460 | struct tpm_buf buf; | |
c659af78 | 461 | u32 hash, rlength; |
5ca4c20c | 462 | int i; |
954650ef JS |
463 | int rc; |
464 | ||
5ca4c20c JS |
465 | for (i = 0; i < ARRAY_SIZE(tpm2_hash_map); i++) { |
466 | if (options->hash == tpm2_hash_map[i].crypto_id) { | |
467 | hash = tpm2_hash_map[i].tpm_id; | |
468 | break; | |
469 | } | |
470 | } | |
471 | ||
472 | if (i == ARRAY_SIZE(tpm2_hash_map)) | |
473 | return -EINVAL; | |
474 | ||
954650ef JS |
475 | rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_CREATE); |
476 | if (rc) | |
477 | return rc; | |
478 | ||
479 | tpm_buf_append_u32(&buf, options->keyhandle); | |
480 | tpm2_buf_append_auth(&buf, TPM2_RS_PW, | |
481 | NULL /* nonce */, 0, | |
482 | 0 /* session_attributes */, | |
483 | options->keyauth /* hmac */, | |
484 | TPM_DIGEST_SIZE); | |
485 | ||
486 | /* sensitive */ | |
2e31125c | 487 | tpm_buf_append_u16(&buf, 4 + TPM_DIGEST_SIZE + payload->key_len + 1); |
954650ef JS |
488 | |
489 | tpm_buf_append_u16(&buf, TPM_DIGEST_SIZE); | |
490 | tpm_buf_append(&buf, options->blobauth, TPM_DIGEST_SIZE); | |
2e31125c | 491 | tpm_buf_append_u16(&buf, payload->key_len + 1); |
954650ef | 492 | tpm_buf_append(&buf, payload->key, payload->key_len); |
2e31125c | 493 | tpm_buf_append_u8(&buf, payload->migratable); |
954650ef JS |
494 | |
495 | /* public */ | |
f3c82ade | 496 | tpm_buf_append_u16(&buf, 14 + options->policydigest_len); |
954650ef | 497 | tpm_buf_append_u16(&buf, TPM2_ALG_KEYEDHASH); |
5ca4c20c | 498 | tpm_buf_append_u16(&buf, hash); |
5beb0c43 JS |
499 | |
500 | /* policy */ | |
f3c82ade | 501 | if (options->policydigest_len) { |
5beb0c43 | 502 | tpm_buf_append_u32(&buf, 0); |
f3c82ade | 503 | tpm_buf_append_u16(&buf, options->policydigest_len); |
5beb0c43 | 504 | tpm_buf_append(&buf, options->policydigest, |
f3c82ade | 505 | options->policydigest_len); |
5beb0c43 | 506 | } else { |
c0b5eed1 | 507 | tpm_buf_append_u32(&buf, TPM2_OA_USER_WITH_AUTH); |
5beb0c43 JS |
508 | tpm_buf_append_u16(&buf, 0); |
509 | } | |
510 | ||
511 | /* public parameters */ | |
954650ef JS |
512 | tpm_buf_append_u16(&buf, TPM2_ALG_NULL); |
513 | tpm_buf_append_u16(&buf, 0); | |
514 | ||
515 | /* outside info */ | |
516 | tpm_buf_append_u16(&buf, 0); | |
517 | ||
518 | /* creation PCR */ | |
519 | tpm_buf_append_u32(&buf, 0); | |
520 | ||
521 | if (buf.flags & TPM_BUF_OVERFLOW) { | |
522 | rc = -E2BIG; | |
523 | goto out; | |
524 | } | |
525 | ||
c659af78 SB |
526 | rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, 4, 0, |
527 | "sealing data"); | |
954650ef JS |
528 | if (rc) |
529 | goto out; | |
530 | ||
531 | blob_len = be32_to_cpup((__be32 *) &buf.data[TPM_HEADER_SIZE]); | |
532 | if (blob_len > MAX_BLOB_SIZE) { | |
533 | rc = -E2BIG; | |
534 | goto out; | |
535 | } | |
c659af78 SB |
536 | rlength = be32_to_cpu(((struct tpm2_cmd *)&buf)->header.out.length); |
537 | if (rlength < TPM_HEADER_SIZE + 4 + blob_len) { | |
538 | rc = -EFAULT; | |
539 | goto out; | |
540 | } | |
954650ef JS |
541 | |
542 | memcpy(payload->blob, &buf.data[TPM_HEADER_SIZE + 4], blob_len); | |
543 | payload->blob_len = blob_len; | |
544 | ||
545 | out: | |
546 | tpm_buf_destroy(&buf); | |
547 | ||
5ca4c20c JS |
548 | if (rc > 0) { |
549 | if ((rc & TPM2_RC_HASH) == TPM2_RC_HASH) | |
550 | rc = -EINVAL; | |
551 | else | |
552 | rc = -EPERM; | |
553 | } | |
954650ef JS |
554 | |
555 | return rc; | |
556 | } | |
557 | ||
d4816edf JS |
558 | /** |
559 | * tpm2_load_cmd() - execute a TPM2_Load command | |
794c6e10 WT |
560 | * |
561 | * @chip: TPM chip to use | |
d4816edf JS |
562 | * @payload: the key data in clear and encrypted form |
563 | * @options: authentication values and other options | |
794c6e10 WT |
564 | * @blob_handle: returned blob handle |
565 | * @flags: tpm transmit flags | |
d4816edf | 566 | * |
794c6e10 WT |
567 | * Return: 0 on success. |
568 | * -E2BIG on wrong payload size. | |
569 | * -EPERM on tpm error status. | |
570 | * < 0 error from tpm_transmit_cmd. | |
d4816edf JS |
571 | */ |
572 | static int tpm2_load_cmd(struct tpm_chip *chip, | |
573 | struct trusted_key_payload *payload, | |
574 | struct trusted_key_options *options, | |
575 | u32 *blob_handle, unsigned int flags) | |
954650ef JS |
576 | { |
577 | struct tpm_buf buf; | |
578 | unsigned int private_len; | |
579 | unsigned int public_len; | |
580 | unsigned int blob_len; | |
581 | int rc; | |
582 | ||
583 | private_len = be16_to_cpup((__be16 *) &payload->blob[0]); | |
584 | if (private_len > (payload->blob_len - 2)) | |
585 | return -E2BIG; | |
586 | ||
587 | public_len = be16_to_cpup((__be16 *) &payload->blob[2 + private_len]); | |
588 | blob_len = private_len + public_len + 4; | |
589 | if (blob_len > payload->blob_len) | |
590 | return -E2BIG; | |
591 | ||
592 | rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_LOAD); | |
593 | if (rc) | |
594 | return rc; | |
595 | ||
596 | tpm_buf_append_u32(&buf, options->keyhandle); | |
597 | tpm2_buf_append_auth(&buf, TPM2_RS_PW, | |
598 | NULL /* nonce */, 0, | |
599 | 0 /* session_attributes */, | |
600 | options->keyauth /* hmac */, | |
601 | TPM_DIGEST_SIZE); | |
602 | ||
603 | tpm_buf_append(&buf, payload->blob, blob_len); | |
604 | ||
605 | if (buf.flags & TPM_BUF_OVERFLOW) { | |
606 | rc = -E2BIG; | |
607 | goto out; | |
608 | } | |
609 | ||
c659af78 SB |
610 | rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, 4, flags, |
611 | "loading blob"); | |
954650ef JS |
612 | if (!rc) |
613 | *blob_handle = be32_to_cpup( | |
614 | (__be32 *) &buf.data[TPM_HEADER_SIZE]); | |
615 | ||
616 | out: | |
617 | tpm_buf_destroy(&buf); | |
618 | ||
619 | if (rc > 0) | |
620 | rc = -EPERM; | |
621 | ||
622 | return rc; | |
623 | } | |
624 | ||
d4816edf JS |
625 | /** |
626 | * tpm2_flush_context_cmd() - execute a TPM2_FlushContext command | |
d4816edf | 627 | * |
794c6e10 WT |
628 | * @chip: TPM chip to use |
629 | * @handle: the key data in clear and encrypted form | |
630 | * @flags: tpm transmit flags | |
631 | * | |
632 | * Return: Same as with tpm_transmit_cmd. | |
d4816edf JS |
633 | */ |
634 | static void tpm2_flush_context_cmd(struct tpm_chip *chip, u32 handle, | |
635 | unsigned int flags) | |
954650ef JS |
636 | { |
637 | struct tpm_buf buf; | |
638 | int rc; | |
639 | ||
640 | rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_FLUSH_CONTEXT); | |
641 | if (rc) { | |
8cfffc9d | 642 | dev_warn(&chip->dev, "0x%08x was not flushed, out of memory\n", |
954650ef JS |
643 | handle); |
644 | return; | |
645 | } | |
646 | ||
647 | tpm_buf_append_u32(&buf, handle); | |
648 | ||
c659af78 | 649 | rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, 0, flags, |
d4816edf | 650 | "flushing context"); |
954650ef | 651 | if (rc) |
8cfffc9d | 652 | dev_warn(&chip->dev, "0x%08x was not flushed, rc=%d\n", handle, |
954650ef JS |
653 | rc); |
654 | ||
655 | tpm_buf_destroy(&buf); | |
656 | } | |
657 | ||
d4816edf JS |
658 | /** |
659 | * tpm2_unseal_cmd() - execute a TPM2_Unload command | |
794c6e10 WT |
660 | * |
661 | * @chip: TPM chip to use | |
d4816edf JS |
662 | * @payload: the key data in clear and encrypted form |
663 | * @options: authentication values and other options | |
794c6e10 WT |
664 | * @blob_handle: blob handle |
665 | * @flags: tpm_transmit_cmd flags | |
d4816edf | 666 | * |
794c6e10 WT |
667 | * Return: 0 on success |
668 | * -EPERM on tpm error status | |
669 | * < 0 error from tpm_transmit_cmd | |
d4816edf JS |
670 | */ |
671 | static int tpm2_unseal_cmd(struct tpm_chip *chip, | |
672 | struct trusted_key_payload *payload, | |
673 | struct trusted_key_options *options, | |
674 | u32 blob_handle, unsigned int flags) | |
954650ef JS |
675 | { |
676 | struct tpm_buf buf; | |
2e31125c JS |
677 | u16 data_len; |
678 | u8 *data; | |
954650ef | 679 | int rc; |
c659af78 | 680 | u32 rlength; |
954650ef JS |
681 | |
682 | rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_UNSEAL); | |
683 | if (rc) | |
684 | return rc; | |
685 | ||
686 | tpm_buf_append_u32(&buf, blob_handle); | |
5beb0c43 JS |
687 | tpm2_buf_append_auth(&buf, |
688 | options->policyhandle ? | |
689 | options->policyhandle : TPM2_RS_PW, | |
954650ef | 690 | NULL /* nonce */, 0, |
c0b5eed1 | 691 | TPM2_SA_CONTINUE_SESSION, |
954650ef JS |
692 | options->blobauth /* hmac */, |
693 | TPM_DIGEST_SIZE); | |
694 | ||
c659af78 SB |
695 | rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, 6, flags, |
696 | "unsealing"); | |
954650ef JS |
697 | if (rc > 0) |
698 | rc = -EPERM; | |
699 | ||
700 | if (!rc) { | |
2e31125c | 701 | data_len = be16_to_cpup( |
954650ef | 702 | (__be16 *) &buf.data[TPM_HEADER_SIZE + 4]); |
c659af78 SB |
703 | |
704 | rlength = be32_to_cpu(((struct tpm2_cmd *)&buf) | |
705 | ->header.out.length); | |
706 | if (rlength < TPM_HEADER_SIZE + 6 + data_len) { | |
707 | rc = -EFAULT; | |
708 | goto out; | |
709 | } | |
2e31125c | 710 | data = &buf.data[TPM_HEADER_SIZE + 6]; |
954650ef | 711 | |
2e31125c JS |
712 | memcpy(payload->key, data, data_len - 1); |
713 | payload->key_len = data_len - 1; | |
714 | payload->migratable = data[data_len - 1]; | |
954650ef JS |
715 | } |
716 | ||
c659af78 | 717 | out: |
954650ef JS |
718 | tpm_buf_destroy(&buf); |
719 | return rc; | |
720 | } | |
721 | ||
722 | /** | |
cbef69a9 | 723 | * tpm2_unseal_trusted() - unseal the payload of a trusted key |
794c6e10 WT |
724 | * |
725 | * @chip: TPM chip to use | |
954650ef | 726 | * @payload: the key data in clear and encrypted form |
d4816edf | 727 | * @options: authentication values and other options |
954650ef | 728 | * |
794c6e10 | 729 | * Return: Same as with tpm_transmit_cmd. |
954650ef JS |
730 | */ |
731 | int tpm2_unseal_trusted(struct tpm_chip *chip, | |
732 | struct trusted_key_payload *payload, | |
733 | struct trusted_key_options *options) | |
734 | { | |
735 | u32 blob_handle; | |
736 | int rc; | |
737 | ||
d4816edf JS |
738 | mutex_lock(&chip->tpm_mutex); |
739 | rc = tpm2_load_cmd(chip, payload, options, &blob_handle, | |
740 | TPM_TRANSMIT_UNLOCKED); | |
954650ef | 741 | if (rc) |
d4816edf | 742 | goto out; |
954650ef | 743 | |
d4816edf JS |
744 | rc = tpm2_unseal_cmd(chip, payload, options, blob_handle, |
745 | TPM_TRANSMIT_UNLOCKED); | |
746 | tpm2_flush_context_cmd(chip, blob_handle, TPM_TRANSMIT_UNLOCKED); | |
747 | out: | |
748 | mutex_unlock(&chip->tpm_mutex); | |
954650ef JS |
749 | return rc; |
750 | } | |
751 | ||
7a1d7e6d JS |
752 | /** |
753 | * tpm2_get_tpm_pt() - get value of a TPM_CAP_TPM_PROPERTIES type property | |
754 | * @chip: TPM chip to use. | |
755 | * @property_id: property ID. | |
756 | * @value: output variable. | |
757 | * @desc: passed to tpm_transmit_cmd() | |
758 | * | |
794c6e10 | 759 | * Return: Same as with tpm_transmit_cmd. |
7a1d7e6d JS |
760 | */ |
761 | ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value, | |
762 | const char *desc) | |
763 | { | |
764 | struct tpm2_cmd cmd; | |
765 | int rc; | |
766 | ||
767 | cmd.header.in = tpm2_get_tpm_pt_header; | |
768 | cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES); | |
769 | cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(property_id); | |
770 | cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1); | |
771 | ||
c659af78 SB |
772 | rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), |
773 | TPM2_GET_TPM_PT_OUT_BODY_SIZE, 0, desc); | |
7a1d7e6d | 774 | if (!rc) |
1b0612b0 | 775 | *value = be32_to_cpu(cmd.params.get_tpm_pt_out.value); |
7a1d7e6d JS |
776 | |
777 | return rc; | |
778 | } | |
eb5854e7 | 779 | EXPORT_SYMBOL_GPL(tpm2_get_tpm_pt); |
7a1d7e6d JS |
780 | |
781 | #define TPM2_STARTUP_IN_SIZE \ | |
782 | (sizeof(struct tpm_input_header) + \ | |
783 | sizeof(struct tpm2_startup_in)) | |
784 | ||
785 | static const struct tpm_input_header tpm2_startup_header = { | |
786 | .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS), | |
787 | .length = cpu_to_be32(TPM2_STARTUP_IN_SIZE), | |
788 | .ordinal = cpu_to_be32(TPM2_CC_STARTUP) | |
789 | }; | |
790 | ||
791 | /** | |
792 | * tpm2_startup() - send startup command to the TPM chip | |
794c6e10 | 793 | * |
7a1d7e6d | 794 | * @chip: TPM chip to use. |
794c6e10 | 795 | * @startup_type: startup type. The value is either |
7a1d7e6d JS |
796 | * TPM_SU_CLEAR or TPM_SU_STATE. |
797 | * | |
794c6e10 | 798 | * Return: Same as with tpm_transmit_cmd. |
7a1d7e6d | 799 | */ |
cae8b441 | 800 | static int tpm2_startup(struct tpm_chip *chip, u16 startup_type) |
7a1d7e6d JS |
801 | { |
802 | struct tpm2_cmd cmd; | |
803 | ||
804 | cmd.header.in = tpm2_startup_header; | |
805 | ||
806 | cmd.params.startup_in.startup_type = cpu_to_be16(startup_type); | |
c659af78 | 807 | return tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, 0, |
7a1d7e6d JS |
808 | "attempting to start the TPM"); |
809 | } | |
7a1d7e6d JS |
810 | |
811 | #define TPM2_SHUTDOWN_IN_SIZE \ | |
812 | (sizeof(struct tpm_input_header) + \ | |
813 | sizeof(struct tpm2_startup_in)) | |
814 | ||
815 | static const struct tpm_input_header tpm2_shutdown_header = { | |
816 | .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS), | |
817 | .length = cpu_to_be32(TPM2_SHUTDOWN_IN_SIZE), | |
818 | .ordinal = cpu_to_be32(TPM2_CC_SHUTDOWN) | |
819 | }; | |
820 | ||
821 | /** | |
822 | * tpm2_shutdown() - send shutdown command to the TPM chip | |
794c6e10 | 823 | * |
7a1d7e6d | 824 | * @chip: TPM chip to use. |
794c6e10 | 825 | * @shutdown_type: shutdown type. The value is either |
7a1d7e6d | 826 | * TPM_SU_CLEAR or TPM_SU_STATE. |
7a1d7e6d | 827 | */ |
74d6b3ce | 828 | void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type) |
7a1d7e6d JS |
829 | { |
830 | struct tpm2_cmd cmd; | |
74d6b3ce | 831 | int rc; |
7a1d7e6d JS |
832 | |
833 | cmd.header.in = tpm2_shutdown_header; | |
7a1d7e6d | 834 | cmd.params.startup_in.startup_type = cpu_to_be16(shutdown_type); |
74d6b3ce | 835 | |
c659af78 SB |
836 | rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, 0, |
837 | "stopping the TPM"); | |
74d6b3ce JS |
838 | |
839 | /* In places where shutdown command is sent there's no much we can do | |
840 | * except print the error code on a system failure. | |
841 | */ | |
842 | if (rc < 0) | |
8cfffc9d | 843 | dev_warn(&chip->dev, "transmit returned %d while stopping the TPM", |
74d6b3ce | 844 | rc); |
7a1d7e6d | 845 | } |
7a1d7e6d JS |
846 | |
847 | /* | |
848 | * tpm2_calc_ordinal_duration() - maximum duration for a command | |
794c6e10 | 849 | * |
7a1d7e6d JS |
850 | * @chip: TPM chip to use. |
851 | * @ordinal: command code number. | |
852 | * | |
794c6e10 | 853 | * Return: maximum duration for a command |
7a1d7e6d JS |
854 | */ |
855 | unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal) | |
856 | { | |
857 | int index = TPM_UNDEFINED; | |
858 | int duration = 0; | |
859 | ||
860 | if (ordinal >= TPM2_CC_FIRST && ordinal <= TPM2_CC_LAST) | |
861 | index = tpm2_ordinal_duration[ordinal - TPM2_CC_FIRST]; | |
862 | ||
863 | if (index != TPM_UNDEFINED) | |
af782f33 | 864 | duration = chip->duration[index]; |
7a1d7e6d JS |
865 | |
866 | if (duration <= 0) | |
867 | duration = 2 * 60 * HZ; | |
868 | ||
869 | return duration; | |
870 | } | |
871 | EXPORT_SYMBOL_GPL(tpm2_calc_ordinal_duration); | |
872 | ||
873 | #define TPM2_SELF_TEST_IN_SIZE \ | |
874 | (sizeof(struct tpm_input_header) + \ | |
875 | sizeof(struct tpm2_self_test_in)) | |
876 | ||
877 | static const struct tpm_input_header tpm2_selftest_header = { | |
878 | .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS), | |
879 | .length = cpu_to_be32(TPM2_SELF_TEST_IN_SIZE), | |
880 | .ordinal = cpu_to_be32(TPM2_CC_SELF_TEST) | |
881 | }; | |
882 | ||
883 | /** | |
884 | * tpm2_continue_selftest() - start a self test | |
794c6e10 | 885 | * |
7a1d7e6d JS |
886 | * @chip: TPM chip to use |
887 | * @full: test all commands instead of testing only those that were not | |
888 | * previously tested. | |
889 | * | |
794c6e10 | 890 | * Return: Same as with tpm_transmit_cmd with exception of RC_TESTING. |
7a1d7e6d JS |
891 | */ |
892 | static int tpm2_start_selftest(struct tpm_chip *chip, bool full) | |
893 | { | |
894 | int rc; | |
895 | struct tpm2_cmd cmd; | |
896 | ||
897 | cmd.header.in = tpm2_selftest_header; | |
898 | cmd.params.selftest_in.full_test = full; | |
899 | ||
c659af78 | 900 | rc = tpm_transmit_cmd(chip, &cmd, TPM2_SELF_TEST_IN_SIZE, 0, 0, |
7a1d7e6d JS |
901 | "continue selftest"); |
902 | ||
903 | /* At least some prototype chips seem to give RC_TESTING error | |
904 | * immediately. This is a workaround for that. | |
905 | */ | |
906 | if (rc == TPM2_RC_TESTING) { | |
8cfffc9d | 907 | dev_warn(&chip->dev, "Got RC_TESTING, ignoring\n"); |
7a1d7e6d JS |
908 | rc = 0; |
909 | } | |
910 | ||
911 | return rc; | |
912 | } | |
913 | ||
914 | /** | |
915 | * tpm2_do_selftest() - run a full self test | |
794c6e10 | 916 | * |
7a1d7e6d JS |
917 | * @chip: TPM chip to use |
918 | * | |
794c6e10 WT |
919 | * Return: Same as with tpm_transmit_cmd. |
920 | * | |
7a1d7e6d JS |
921 | * During the self test TPM2 commands return with the error code RC_TESTING. |
922 | * Waiting is done by issuing PCR read until it executes successfully. | |
7a1d7e6d | 923 | */ |
cae8b441 | 924 | static int tpm2_do_selftest(struct tpm_chip *chip) |
7a1d7e6d JS |
925 | { |
926 | int rc; | |
927 | unsigned int loops; | |
928 | unsigned int delay_msec = 100; | |
929 | unsigned long duration; | |
930 | struct tpm2_cmd cmd; | |
931 | int i; | |
932 | ||
933 | duration = tpm2_calc_ordinal_duration(chip, TPM2_CC_SELF_TEST); | |
934 | ||
935 | loops = jiffies_to_msecs(duration) / delay_msec; | |
936 | ||
937 | rc = tpm2_start_selftest(chip, true); | |
938 | if (rc) | |
939 | return rc; | |
940 | ||
941 | for (i = 0; i < loops; i++) { | |
942 | /* Attempt to read a PCR value */ | |
943 | cmd.header.in = tpm2_pcrread_header; | |
944 | cmd.params.pcrread_in.pcr_selects_cnt = cpu_to_be32(1); | |
945 | cmd.params.pcrread_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1); | |
946 | cmd.params.pcrread_in.pcr_select_size = TPM2_PCR_SELECT_MIN; | |
947 | cmd.params.pcrread_in.pcr_select[0] = 0x01; | |
948 | cmd.params.pcrread_in.pcr_select[1] = 0x00; | |
949 | cmd.params.pcrread_in.pcr_select[2] = 0x00; | |
950 | ||
c659af78 | 951 | rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, 0, NULL); |
7a1d7e6d JS |
952 | if (rc < 0) |
953 | break; | |
954 | ||
955 | rc = be32_to_cpu(cmd.header.out.return_code); | |
956 | if (rc != TPM2_RC_TESTING) | |
957 | break; | |
958 | ||
959 | msleep(delay_msec); | |
960 | } | |
961 | ||
962 | return rc; | |
963 | } | |
7a1d7e6d | 964 | |
4d5f2051 JS |
965 | /** |
966 | * tpm2_probe() - probe TPM 2.0 | |
967 | * @chip: TPM chip to use | |
968 | * | |
794c6e10 WT |
969 | * Return: < 0 error and 0 on success. |
970 | * | |
4d5f2051 JS |
971 | * Send idempotent TPM 2.0 command and see whether TPM 2.0 chip replied based on |
972 | * the reply tag. | |
973 | */ | |
974 | int tpm2_probe(struct tpm_chip *chip) | |
975 | { | |
976 | struct tpm2_cmd cmd; | |
977 | int rc; | |
978 | ||
979 | cmd.header.in = tpm2_get_tpm_pt_header; | |
980 | cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES); | |
981 | cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(0x100); | |
982 | cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1); | |
983 | ||
c659af78 | 984 | rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, 0, NULL); |
4d5f2051 JS |
985 | if (rc < 0) |
986 | return rc; | |
4d5f2051 JS |
987 | |
988 | if (be16_to_cpu(cmd.header.out.tag) == TPM2_ST_NO_SESSIONS) | |
989 | chip->flags |= TPM_CHIP_FLAG_TPM2; | |
990 | ||
991 | return 0; | |
992 | } | |
993 | EXPORT_SYMBOL_GPL(tpm2_probe); | |
cae8b441 JG |
994 | |
995 | /** | |
996 | * tpm2_auto_startup - Perform the standard automatic TPM initialization | |
997 | * sequence | |
998 | * @chip: TPM chip to use | |
999 | * | |
1000 | * Returns 0 on success, < 0 in case of fatal error. | |
1001 | */ | |
1002 | int tpm2_auto_startup(struct tpm_chip *chip) | |
1003 | { | |
1004 | int rc; | |
1005 | ||
1006 | rc = tpm_get_timeouts(chip); | |
1007 | if (rc) | |
1008 | goto out; | |
1009 | ||
1010 | rc = tpm2_do_selftest(chip); | |
b7d7b284 | 1011 | if (rc != 0 && rc != TPM2_RC_INITIALIZE) { |
cae8b441 JG |
1012 | dev_err(&chip->dev, "TPM self test failed\n"); |
1013 | goto out; | |
1014 | } | |
1015 | ||
1016 | if (rc == TPM2_RC_INITIALIZE) { | |
1017 | rc = tpm2_startup(chip, TPM2_SU_CLEAR); | |
1018 | if (rc) | |
1019 | goto out; | |
1020 | ||
1021 | rc = tpm2_do_selftest(chip); | |
1022 | if (rc) { | |
1023 | dev_err(&chip->dev, "TPM self test failed\n"); | |
1024 | goto out; | |
1025 | } | |
1026 | } | |
1027 | ||
cae8b441 JG |
1028 | out: |
1029 | if (rc > 0) | |
1030 | rc = -ENODEV; | |
1031 | return rc; | |
1032 | } |