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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 | ||
251 | static const struct tpm_input_header tpm2_pcrread_header = { | |
252 | .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS), | |
253 | .length = cpu_to_be32(TPM2_PCR_READ_IN_SIZE), | |
254 | .ordinal = cpu_to_be32(TPM2_CC_PCR_READ) | |
255 | }; | |
256 | ||
257 | /** | |
258 | * tpm2_pcr_read() - read a PCR value | |
259 | * @chip: TPM chip to use. | |
260 | * @pcr_idx: index of the PCR to read. | |
261 | * @ref_buf: buffer to store the resulting hash, | |
262 | * | |
263 | * 0 is returned when the operation is successful. If a negative number is | |
264 | * returned it remarks a POSIX error code. If a positive number is returned | |
265 | * it remarks a TPM error. | |
266 | */ | |
267 | int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf) | |
268 | { | |
269 | int rc; | |
270 | struct tpm2_cmd cmd; | |
271 | u8 *buf; | |
272 | ||
273 | if (pcr_idx >= TPM2_PLATFORM_PCR) | |
274 | return -EINVAL; | |
275 | ||
276 | cmd.header.in = tpm2_pcrread_header; | |
277 | cmd.params.pcrread_in.pcr_selects_cnt = cpu_to_be32(1); | |
278 | cmd.params.pcrread_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1); | |
279 | cmd.params.pcrread_in.pcr_select_size = TPM2_PCR_SELECT_MIN; | |
280 | ||
281 | memset(cmd.params.pcrread_in.pcr_select, 0, | |
282 | sizeof(cmd.params.pcrread_in.pcr_select)); | |
283 | cmd.params.pcrread_in.pcr_select[pcr_idx >> 3] = 1 << (pcr_idx & 0x7); | |
284 | ||
285 | rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), | |
286 | "attempting to read a pcr value"); | |
287 | if (rc == 0) { | |
288 | buf = cmd.params.pcrread_out.digest; | |
289 | memcpy(res_buf, buf, TPM_DIGEST_SIZE); | |
290 | } | |
291 | ||
292 | return rc; | |
293 | } | |
294 | ||
295 | #define TPM2_GET_PCREXTEND_IN_SIZE \ | |
296 | (sizeof(struct tpm_input_header) + \ | |
297 | sizeof(struct tpm2_pcr_extend_in)) | |
298 | ||
299 | static const struct tpm_input_header tpm2_pcrextend_header = { | |
300 | .tag = cpu_to_be16(TPM2_ST_SESSIONS), | |
301 | .length = cpu_to_be32(TPM2_GET_PCREXTEND_IN_SIZE), | |
302 | .ordinal = cpu_to_be32(TPM2_CC_PCR_EXTEND) | |
303 | }; | |
304 | ||
305 | /** | |
306 | * tpm2_pcr_extend() - extend a PCR value | |
307 | * @chip: TPM chip to use. | |
308 | * @pcr_idx: index of the PCR. | |
309 | * @hash: hash value to use for the extend operation. | |
310 | * | |
311 | * 0 is returned when the operation is successful. If a negative number is | |
312 | * returned it remarks a POSIX error code. If a positive number is returned | |
313 | * it remarks a TPM error. | |
314 | */ | |
315 | int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash) | |
316 | { | |
317 | struct tpm2_cmd cmd; | |
318 | int rc; | |
319 | ||
320 | cmd.header.in = tpm2_pcrextend_header; | |
321 | cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx); | |
322 | cmd.params.pcrextend_in.auth_area_size = | |
323 | cpu_to_be32(sizeof(struct tpm2_null_auth_area)); | |
324 | cmd.params.pcrextend_in.auth_area.handle = | |
325 | cpu_to_be32(TPM2_RS_PW); | |
326 | cmd.params.pcrextend_in.auth_area.nonce_size = 0; | |
327 | cmd.params.pcrextend_in.auth_area.attributes = 0; | |
328 | cmd.params.pcrextend_in.auth_area.auth_size = 0; | |
329 | cmd.params.pcrextend_in.digest_cnt = cpu_to_be32(1); | |
330 | cmd.params.pcrextend_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1); | |
331 | memcpy(cmd.params.pcrextend_in.digest, hash, TPM_DIGEST_SIZE); | |
332 | ||
333 | rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), | |
334 | "attempting extend a PCR value"); | |
335 | ||
336 | return rc; | |
337 | } | |
338 | ||
339 | #define TPM2_GETRANDOM_IN_SIZE \ | |
340 | (sizeof(struct tpm_input_header) + \ | |
341 | sizeof(struct tpm2_get_random_in)) | |
342 | ||
343 | static const struct tpm_input_header tpm2_getrandom_header = { | |
344 | .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS), | |
345 | .length = cpu_to_be32(TPM2_GETRANDOM_IN_SIZE), | |
346 | .ordinal = cpu_to_be32(TPM2_CC_GET_RANDOM) | |
347 | }; | |
348 | ||
349 | /** | |
350 | * tpm2_get_random() - get random bytes from the TPM RNG | |
351 | * @chip: TPM chip to use | |
352 | * @out: destination buffer for the random bytes | |
353 | * @max: the max number of bytes to write to @out | |
354 | * | |
355 | * 0 is returned when the operation is successful. If a negative number is | |
356 | * returned it remarks a POSIX error code. If a positive number is returned | |
357 | * it remarks a TPM error. | |
358 | */ | |
359 | int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max) | |
360 | { | |
361 | struct tpm2_cmd cmd; | |
362 | u32 recd; | |
363 | u32 num_bytes; | |
364 | int err; | |
365 | int total = 0; | |
366 | int retries = 5; | |
367 | u8 *dest = out; | |
368 | ||
369 | num_bytes = min_t(u32, max, sizeof(cmd.params.getrandom_out.buffer)); | |
370 | ||
371 | if (!out || !num_bytes || | |
372 | max > sizeof(cmd.params.getrandom_out.buffer)) | |
373 | return -EINVAL; | |
374 | ||
375 | do { | |
376 | cmd.header.in = tpm2_getrandom_header; | |
377 | cmd.params.getrandom_in.size = cpu_to_be16(num_bytes); | |
378 | ||
379 | err = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), | |
380 | "attempting get random"); | |
381 | if (err) | |
382 | break; | |
383 | ||
384 | recd = min_t(u32, be16_to_cpu(cmd.params.getrandom_out.size), | |
385 | num_bytes); | |
386 | memcpy(dest, cmd.params.getrandom_out.buffer, recd); | |
387 | ||
388 | dest += recd; | |
389 | total += recd; | |
390 | num_bytes -= recd; | |
391 | } while (retries-- && total < max); | |
392 | ||
393 | return total ? total : -EIO; | |
394 | } | |
395 | ||
396 | #define TPM2_GET_TPM_PT_IN_SIZE \ | |
397 | (sizeof(struct tpm_input_header) + \ | |
398 | sizeof(struct tpm2_get_tpm_pt_in)) | |
399 | ||
400 | static const struct tpm_input_header tpm2_get_tpm_pt_header = { | |
401 | .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS), | |
402 | .length = cpu_to_be32(TPM2_GET_TPM_PT_IN_SIZE), | |
403 | .ordinal = cpu_to_be32(TPM2_CC_GET_CAPABILITY) | |
404 | }; | |
405 | ||
954650ef JS |
406 | /** |
407 | * Append TPMS_AUTH_COMMAND to the buffer. The buffer must be allocated with | |
408 | * tpm_buf_alloc(). | |
409 | * | |
410 | * @param buf: an allocated tpm_buf instance | |
411 | * @param nonce: the session nonce, may be NULL if not used | |
412 | * @param nonce_len: the session nonce length, may be 0 if not used | |
413 | * @param attributes: the session attributes | |
414 | * @param hmac: the session HMAC or password, may be NULL if not used | |
415 | * @param hmac_len: the session HMAC or password length, maybe 0 if not used | |
416 | */ | |
417 | static void tpm2_buf_append_auth(struct tpm_buf *buf, u32 session_handle, | |
418 | const u8 *nonce, u16 nonce_len, | |
419 | u8 attributes, | |
420 | const u8 *hmac, u16 hmac_len) | |
421 | { | |
422 | tpm_buf_append_u32(buf, 9 + nonce_len + hmac_len); | |
423 | tpm_buf_append_u32(buf, session_handle); | |
424 | tpm_buf_append_u16(buf, nonce_len); | |
425 | ||
426 | if (nonce && nonce_len) | |
427 | tpm_buf_append(buf, nonce, nonce_len); | |
428 | ||
429 | tpm_buf_append_u8(buf, attributes); | |
430 | tpm_buf_append_u16(buf, hmac_len); | |
431 | ||
432 | if (hmac && hmac_len) | |
433 | tpm_buf_append(buf, hmac, hmac_len); | |
434 | } | |
435 | ||
436 | /** | |
437 | * tpm2_seal_trusted() - seal a trusted key | |
438 | * @chip_num: A specific chip number for the request or TPM_ANY_NUM | |
439 | * @options: authentication values and other options | |
440 | * @payload: the key data in clear and encrypted form | |
441 | * | |
442 | * Returns < 0 on error and 0 on success. | |
443 | */ | |
444 | int tpm2_seal_trusted(struct tpm_chip *chip, | |
445 | struct trusted_key_payload *payload, | |
446 | struct trusted_key_options *options) | |
447 | { | |
448 | unsigned int blob_len; | |
449 | struct tpm_buf buf; | |
5ca4c20c JS |
450 | u32 hash; |
451 | int i; | |
954650ef JS |
452 | int rc; |
453 | ||
5ca4c20c JS |
454 | for (i = 0; i < ARRAY_SIZE(tpm2_hash_map); i++) { |
455 | if (options->hash == tpm2_hash_map[i].crypto_id) { | |
456 | hash = tpm2_hash_map[i].tpm_id; | |
457 | break; | |
458 | } | |
459 | } | |
460 | ||
461 | if (i == ARRAY_SIZE(tpm2_hash_map)) | |
462 | return -EINVAL; | |
463 | ||
954650ef JS |
464 | rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_CREATE); |
465 | if (rc) | |
466 | return rc; | |
467 | ||
468 | tpm_buf_append_u32(&buf, options->keyhandle); | |
469 | tpm2_buf_append_auth(&buf, TPM2_RS_PW, | |
470 | NULL /* nonce */, 0, | |
471 | 0 /* session_attributes */, | |
472 | options->keyauth /* hmac */, | |
473 | TPM_DIGEST_SIZE); | |
474 | ||
475 | /* sensitive */ | |
2e31125c | 476 | tpm_buf_append_u16(&buf, 4 + TPM_DIGEST_SIZE + payload->key_len + 1); |
954650ef JS |
477 | |
478 | tpm_buf_append_u16(&buf, TPM_DIGEST_SIZE); | |
479 | tpm_buf_append(&buf, options->blobauth, TPM_DIGEST_SIZE); | |
2e31125c | 480 | tpm_buf_append_u16(&buf, payload->key_len + 1); |
954650ef | 481 | tpm_buf_append(&buf, payload->key, payload->key_len); |
2e31125c | 482 | tpm_buf_append_u8(&buf, payload->migratable); |
954650ef JS |
483 | |
484 | /* public */ | |
f3c82ade | 485 | tpm_buf_append_u16(&buf, 14 + options->policydigest_len); |
954650ef | 486 | tpm_buf_append_u16(&buf, TPM2_ALG_KEYEDHASH); |
5ca4c20c | 487 | tpm_buf_append_u16(&buf, hash); |
5beb0c43 JS |
488 | |
489 | /* policy */ | |
f3c82ade | 490 | if (options->policydigest_len) { |
5beb0c43 | 491 | tpm_buf_append_u32(&buf, 0); |
f3c82ade | 492 | tpm_buf_append_u16(&buf, options->policydigest_len); |
5beb0c43 | 493 | tpm_buf_append(&buf, options->policydigest, |
f3c82ade | 494 | options->policydigest_len); |
5beb0c43 | 495 | } else { |
c0b5eed1 | 496 | tpm_buf_append_u32(&buf, TPM2_OA_USER_WITH_AUTH); |
5beb0c43 JS |
497 | tpm_buf_append_u16(&buf, 0); |
498 | } | |
499 | ||
500 | /* public parameters */ | |
954650ef JS |
501 | tpm_buf_append_u16(&buf, TPM2_ALG_NULL); |
502 | tpm_buf_append_u16(&buf, 0); | |
503 | ||
504 | /* outside info */ | |
505 | tpm_buf_append_u16(&buf, 0); | |
506 | ||
507 | /* creation PCR */ | |
508 | tpm_buf_append_u32(&buf, 0); | |
509 | ||
510 | if (buf.flags & TPM_BUF_OVERFLOW) { | |
511 | rc = -E2BIG; | |
512 | goto out; | |
513 | } | |
514 | ||
515 | rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, "sealing data"); | |
516 | if (rc) | |
517 | goto out; | |
518 | ||
519 | blob_len = be32_to_cpup((__be32 *) &buf.data[TPM_HEADER_SIZE]); | |
520 | if (blob_len > MAX_BLOB_SIZE) { | |
521 | rc = -E2BIG; | |
522 | goto out; | |
523 | } | |
524 | ||
525 | memcpy(payload->blob, &buf.data[TPM_HEADER_SIZE + 4], blob_len); | |
526 | payload->blob_len = blob_len; | |
527 | ||
528 | out: | |
529 | tpm_buf_destroy(&buf); | |
530 | ||
5ca4c20c JS |
531 | if (rc > 0) { |
532 | if ((rc & TPM2_RC_HASH) == TPM2_RC_HASH) | |
533 | rc = -EINVAL; | |
534 | else | |
535 | rc = -EPERM; | |
536 | } | |
954650ef JS |
537 | |
538 | return rc; | |
539 | } | |
540 | ||
541 | static int tpm2_load(struct tpm_chip *chip, | |
542 | struct trusted_key_payload *payload, | |
543 | struct trusted_key_options *options, | |
544 | u32 *blob_handle) | |
545 | { | |
546 | struct tpm_buf buf; | |
547 | unsigned int private_len; | |
548 | unsigned int public_len; | |
549 | unsigned int blob_len; | |
550 | int rc; | |
551 | ||
552 | private_len = be16_to_cpup((__be16 *) &payload->blob[0]); | |
553 | if (private_len > (payload->blob_len - 2)) | |
554 | return -E2BIG; | |
555 | ||
556 | public_len = be16_to_cpup((__be16 *) &payload->blob[2 + private_len]); | |
557 | blob_len = private_len + public_len + 4; | |
558 | if (blob_len > payload->blob_len) | |
559 | return -E2BIG; | |
560 | ||
561 | rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_LOAD); | |
562 | if (rc) | |
563 | return rc; | |
564 | ||
565 | tpm_buf_append_u32(&buf, options->keyhandle); | |
566 | tpm2_buf_append_auth(&buf, TPM2_RS_PW, | |
567 | NULL /* nonce */, 0, | |
568 | 0 /* session_attributes */, | |
569 | options->keyauth /* hmac */, | |
570 | TPM_DIGEST_SIZE); | |
571 | ||
572 | tpm_buf_append(&buf, payload->blob, blob_len); | |
573 | ||
574 | if (buf.flags & TPM_BUF_OVERFLOW) { | |
575 | rc = -E2BIG; | |
576 | goto out; | |
577 | } | |
578 | ||
579 | rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, "loading blob"); | |
580 | if (!rc) | |
581 | *blob_handle = be32_to_cpup( | |
582 | (__be32 *) &buf.data[TPM_HEADER_SIZE]); | |
583 | ||
584 | out: | |
585 | tpm_buf_destroy(&buf); | |
586 | ||
587 | if (rc > 0) | |
588 | rc = -EPERM; | |
589 | ||
590 | return rc; | |
591 | } | |
592 | ||
593 | static void tpm2_flush_context(struct tpm_chip *chip, u32 handle) | |
594 | { | |
595 | struct tpm_buf buf; | |
596 | int rc; | |
597 | ||
598 | rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_FLUSH_CONTEXT); | |
599 | if (rc) { | |
8cfffc9d | 600 | dev_warn(&chip->dev, "0x%08x was not flushed, out of memory\n", |
954650ef JS |
601 | handle); |
602 | return; | |
603 | } | |
604 | ||
605 | tpm_buf_append_u32(&buf, handle); | |
606 | ||
607 | rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, "flushing context"); | |
608 | if (rc) | |
8cfffc9d | 609 | dev_warn(&chip->dev, "0x%08x was not flushed, rc=%d\n", handle, |
954650ef JS |
610 | rc); |
611 | ||
612 | tpm_buf_destroy(&buf); | |
613 | } | |
614 | ||
615 | static int tpm2_unseal(struct tpm_chip *chip, | |
616 | struct trusted_key_payload *payload, | |
617 | struct trusted_key_options *options, | |
618 | u32 blob_handle) | |
619 | { | |
620 | struct tpm_buf buf; | |
2e31125c JS |
621 | u16 data_len; |
622 | u8 *data; | |
954650ef JS |
623 | int rc; |
624 | ||
625 | rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_UNSEAL); | |
626 | if (rc) | |
627 | return rc; | |
628 | ||
629 | tpm_buf_append_u32(&buf, blob_handle); | |
5beb0c43 JS |
630 | tpm2_buf_append_auth(&buf, |
631 | options->policyhandle ? | |
632 | options->policyhandle : TPM2_RS_PW, | |
954650ef | 633 | NULL /* nonce */, 0, |
c0b5eed1 | 634 | TPM2_SA_CONTINUE_SESSION, |
954650ef JS |
635 | options->blobauth /* hmac */, |
636 | TPM_DIGEST_SIZE); | |
637 | ||
638 | rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, "unsealing"); | |
639 | if (rc > 0) | |
640 | rc = -EPERM; | |
641 | ||
642 | if (!rc) { | |
2e31125c | 643 | data_len = be16_to_cpup( |
954650ef | 644 | (__be16 *) &buf.data[TPM_HEADER_SIZE + 4]); |
2e31125c | 645 | data = &buf.data[TPM_HEADER_SIZE + 6]; |
954650ef | 646 | |
2e31125c JS |
647 | memcpy(payload->key, data, data_len - 1); |
648 | payload->key_len = data_len - 1; | |
649 | payload->migratable = data[data_len - 1]; | |
954650ef JS |
650 | } |
651 | ||
652 | tpm_buf_destroy(&buf); | |
653 | return rc; | |
654 | } | |
655 | ||
656 | /** | |
657 | * tpm_unseal_trusted() - unseal a trusted key | |
658 | * @chip_num: A specific chip number for the request or TPM_ANY_NUM | |
659 | * @options: authentication values and other options | |
660 | * @payload: the key data in clear and encrypted form | |
661 | * | |
662 | * Returns < 0 on error and 0 on success. | |
663 | */ | |
664 | int tpm2_unseal_trusted(struct tpm_chip *chip, | |
665 | struct trusted_key_payload *payload, | |
666 | struct trusted_key_options *options) | |
667 | { | |
668 | u32 blob_handle; | |
669 | int rc; | |
670 | ||
671 | rc = tpm2_load(chip, payload, options, &blob_handle); | |
672 | if (rc) | |
673 | return rc; | |
674 | ||
675 | rc = tpm2_unseal(chip, payload, options, blob_handle); | |
676 | ||
677 | tpm2_flush_context(chip, blob_handle); | |
678 | ||
679 | return rc; | |
680 | } | |
681 | ||
7a1d7e6d JS |
682 | /** |
683 | * tpm2_get_tpm_pt() - get value of a TPM_CAP_TPM_PROPERTIES type property | |
684 | * @chip: TPM chip to use. | |
685 | * @property_id: property ID. | |
686 | * @value: output variable. | |
687 | * @desc: passed to tpm_transmit_cmd() | |
688 | * | |
689 | * 0 is returned when the operation is successful. If a negative number is | |
690 | * returned it remarks a POSIX error code. If a positive number is returned | |
691 | * it remarks a TPM error. | |
692 | */ | |
693 | ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value, | |
694 | const char *desc) | |
695 | { | |
696 | struct tpm2_cmd cmd; | |
697 | int rc; | |
698 | ||
699 | cmd.header.in = tpm2_get_tpm_pt_header; | |
700 | cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES); | |
701 | cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(property_id); | |
702 | cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1); | |
703 | ||
704 | rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), desc); | |
705 | if (!rc) | |
1b0612b0 | 706 | *value = be32_to_cpu(cmd.params.get_tpm_pt_out.value); |
7a1d7e6d JS |
707 | |
708 | return rc; | |
709 | } | |
710 | ||
711 | #define TPM2_STARTUP_IN_SIZE \ | |
712 | (sizeof(struct tpm_input_header) + \ | |
713 | sizeof(struct tpm2_startup_in)) | |
714 | ||
715 | static const struct tpm_input_header tpm2_startup_header = { | |
716 | .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS), | |
717 | .length = cpu_to_be32(TPM2_STARTUP_IN_SIZE), | |
718 | .ordinal = cpu_to_be32(TPM2_CC_STARTUP) | |
719 | }; | |
720 | ||
721 | /** | |
722 | * tpm2_startup() - send startup command to the TPM chip | |
723 | * @chip: TPM chip to use. | |
724 | * @startup_type startup type. The value is either | |
725 | * TPM_SU_CLEAR or TPM_SU_STATE. | |
726 | * | |
727 | * 0 is returned when the operation is successful. If a negative number is | |
728 | * returned it remarks a POSIX error code. If a positive number is returned | |
729 | * it remarks a TPM error. | |
730 | */ | |
cae8b441 | 731 | static int tpm2_startup(struct tpm_chip *chip, u16 startup_type) |
7a1d7e6d JS |
732 | { |
733 | struct tpm2_cmd cmd; | |
734 | ||
735 | cmd.header.in = tpm2_startup_header; | |
736 | ||
737 | cmd.params.startup_in.startup_type = cpu_to_be16(startup_type); | |
738 | return tpm_transmit_cmd(chip, &cmd, sizeof(cmd), | |
739 | "attempting to start the TPM"); | |
740 | } | |
7a1d7e6d JS |
741 | |
742 | #define TPM2_SHUTDOWN_IN_SIZE \ | |
743 | (sizeof(struct tpm_input_header) + \ | |
744 | sizeof(struct tpm2_startup_in)) | |
745 | ||
746 | static const struct tpm_input_header tpm2_shutdown_header = { | |
747 | .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS), | |
748 | .length = cpu_to_be32(TPM2_SHUTDOWN_IN_SIZE), | |
749 | .ordinal = cpu_to_be32(TPM2_CC_SHUTDOWN) | |
750 | }; | |
751 | ||
752 | /** | |
753 | * tpm2_shutdown() - send shutdown command to the TPM chip | |
754 | * @chip: TPM chip to use. | |
755 | * @shutdown_type shutdown type. The value is either | |
756 | * TPM_SU_CLEAR or TPM_SU_STATE. | |
7a1d7e6d | 757 | */ |
74d6b3ce | 758 | void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type) |
7a1d7e6d JS |
759 | { |
760 | struct tpm2_cmd cmd; | |
74d6b3ce | 761 | int rc; |
7a1d7e6d JS |
762 | |
763 | cmd.header.in = tpm2_shutdown_header; | |
7a1d7e6d | 764 | cmd.params.startup_in.startup_type = cpu_to_be16(shutdown_type); |
74d6b3ce JS |
765 | |
766 | rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), "stopping the TPM"); | |
767 | ||
768 | /* In places where shutdown command is sent there's no much we can do | |
769 | * except print the error code on a system failure. | |
770 | */ | |
771 | if (rc < 0) | |
8cfffc9d | 772 | dev_warn(&chip->dev, "transmit returned %d while stopping the TPM", |
74d6b3ce | 773 | rc); |
7a1d7e6d | 774 | } |
7a1d7e6d JS |
775 | |
776 | /* | |
777 | * tpm2_calc_ordinal_duration() - maximum duration for a command | |
778 | * @chip: TPM chip to use. | |
779 | * @ordinal: command code number. | |
780 | * | |
781 | * 0 is returned when the operation is successful. If a negative number is | |
782 | * returned it remarks a POSIX error code. If a positive number is returned | |
783 | * it remarks a TPM error. | |
784 | */ | |
785 | unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal) | |
786 | { | |
787 | int index = TPM_UNDEFINED; | |
788 | int duration = 0; | |
789 | ||
790 | if (ordinal >= TPM2_CC_FIRST && ordinal <= TPM2_CC_LAST) | |
791 | index = tpm2_ordinal_duration[ordinal - TPM2_CC_FIRST]; | |
792 | ||
793 | if (index != TPM_UNDEFINED) | |
af782f33 | 794 | duration = chip->duration[index]; |
7a1d7e6d JS |
795 | |
796 | if (duration <= 0) | |
797 | duration = 2 * 60 * HZ; | |
798 | ||
799 | return duration; | |
800 | } | |
801 | EXPORT_SYMBOL_GPL(tpm2_calc_ordinal_duration); | |
802 | ||
803 | #define TPM2_SELF_TEST_IN_SIZE \ | |
804 | (sizeof(struct tpm_input_header) + \ | |
805 | sizeof(struct tpm2_self_test_in)) | |
806 | ||
807 | static const struct tpm_input_header tpm2_selftest_header = { | |
808 | .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS), | |
809 | .length = cpu_to_be32(TPM2_SELF_TEST_IN_SIZE), | |
810 | .ordinal = cpu_to_be32(TPM2_CC_SELF_TEST) | |
811 | }; | |
812 | ||
813 | /** | |
814 | * tpm2_continue_selftest() - start a self test | |
815 | * @chip: TPM chip to use | |
816 | * @full: test all commands instead of testing only those that were not | |
817 | * previously tested. | |
818 | * | |
819 | * 0 is returned when the operation is successful. If a negative number is | |
820 | * returned it remarks a POSIX error code. If a positive number is returned | |
821 | * it remarks a TPM error. | |
822 | */ | |
823 | static int tpm2_start_selftest(struct tpm_chip *chip, bool full) | |
824 | { | |
825 | int rc; | |
826 | struct tpm2_cmd cmd; | |
827 | ||
828 | cmd.header.in = tpm2_selftest_header; | |
829 | cmd.params.selftest_in.full_test = full; | |
830 | ||
831 | rc = tpm_transmit_cmd(chip, &cmd, TPM2_SELF_TEST_IN_SIZE, | |
832 | "continue selftest"); | |
833 | ||
834 | /* At least some prototype chips seem to give RC_TESTING error | |
835 | * immediately. This is a workaround for that. | |
836 | */ | |
837 | if (rc == TPM2_RC_TESTING) { | |
8cfffc9d | 838 | dev_warn(&chip->dev, "Got RC_TESTING, ignoring\n"); |
7a1d7e6d JS |
839 | rc = 0; |
840 | } | |
841 | ||
842 | return rc; | |
843 | } | |
844 | ||
845 | /** | |
846 | * tpm2_do_selftest() - run a full self test | |
847 | * @chip: TPM chip to use | |
848 | * | |
849 | * During the self test TPM2 commands return with the error code RC_TESTING. | |
850 | * Waiting is done by issuing PCR read until it executes successfully. | |
851 | * | |
852 | * 0 is returned when the operation is successful. If a negative number is | |
853 | * returned it remarks a POSIX error code. If a positive number is returned | |
854 | * it remarks a TPM error. | |
855 | */ | |
cae8b441 | 856 | static int tpm2_do_selftest(struct tpm_chip *chip) |
7a1d7e6d JS |
857 | { |
858 | int rc; | |
859 | unsigned int loops; | |
860 | unsigned int delay_msec = 100; | |
861 | unsigned long duration; | |
862 | struct tpm2_cmd cmd; | |
863 | int i; | |
864 | ||
865 | duration = tpm2_calc_ordinal_duration(chip, TPM2_CC_SELF_TEST); | |
866 | ||
867 | loops = jiffies_to_msecs(duration) / delay_msec; | |
868 | ||
869 | rc = tpm2_start_selftest(chip, true); | |
870 | if (rc) | |
871 | return rc; | |
872 | ||
873 | for (i = 0; i < loops; i++) { | |
874 | /* Attempt to read a PCR value */ | |
875 | cmd.header.in = tpm2_pcrread_header; | |
876 | cmd.params.pcrread_in.pcr_selects_cnt = cpu_to_be32(1); | |
877 | cmd.params.pcrread_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1); | |
878 | cmd.params.pcrread_in.pcr_select_size = TPM2_PCR_SELECT_MIN; | |
879 | cmd.params.pcrread_in.pcr_select[0] = 0x01; | |
880 | cmd.params.pcrread_in.pcr_select[1] = 0x00; | |
881 | cmd.params.pcrread_in.pcr_select[2] = 0x00; | |
882 | ||
883 | rc = tpm_transmit_cmd(chip, (u8 *) &cmd, sizeof(cmd), NULL); | |
884 | if (rc < 0) | |
885 | break; | |
886 | ||
887 | rc = be32_to_cpu(cmd.header.out.return_code); | |
888 | if (rc != TPM2_RC_TESTING) | |
889 | break; | |
890 | ||
891 | msleep(delay_msec); | |
892 | } | |
893 | ||
894 | return rc; | |
895 | } | |
7a1d7e6d JS |
896 | |
897 | /** | |
898 | * tpm2_gen_interrupt() - generate an interrupt | |
899 | * @chip: TPM chip to use | |
7a1d7e6d JS |
900 | * |
901 | * 0 is returned when the operation is successful. If a negative number is | |
902 | * returned it remarks a POSIX error code. If a positive number is returned | |
903 | * it remarks a TPM error. | |
904 | */ | |
4d5f2051 | 905 | int tpm2_gen_interrupt(struct tpm_chip *chip) |
7a1d7e6d | 906 | { |
7a1d7e6d JS |
907 | u32 dummy; |
908 | ||
4d5f2051 JS |
909 | return tpm2_get_tpm_pt(chip, 0x100, &dummy, |
910 | "attempting to generate an interrupt"); | |
7a1d7e6d JS |
911 | } |
912 | EXPORT_SYMBOL_GPL(tpm2_gen_interrupt); | |
4d5f2051 JS |
913 | |
914 | /** | |
915 | * tpm2_probe() - probe TPM 2.0 | |
916 | * @chip: TPM chip to use | |
917 | * | |
918 | * Send idempotent TPM 2.0 command and see whether TPM 2.0 chip replied based on | |
919 | * the reply tag. | |
920 | */ | |
921 | int tpm2_probe(struct tpm_chip *chip) | |
922 | { | |
923 | struct tpm2_cmd cmd; | |
924 | int rc; | |
925 | ||
926 | cmd.header.in = tpm2_get_tpm_pt_header; | |
927 | cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES); | |
928 | cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(0x100); | |
929 | cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1); | |
930 | ||
931 | rc = tpm_transmit(chip, (const char *) &cmd, sizeof(cmd)); | |
932 | if (rc < 0) | |
933 | return rc; | |
934 | else if (rc < TPM_HEADER_SIZE) | |
935 | return -EFAULT; | |
936 | ||
937 | if (be16_to_cpu(cmd.header.out.tag) == TPM2_ST_NO_SESSIONS) | |
938 | chip->flags |= TPM_CHIP_FLAG_TPM2; | |
939 | ||
940 | return 0; | |
941 | } | |
942 | EXPORT_SYMBOL_GPL(tpm2_probe); | |
cae8b441 JG |
943 | |
944 | /** | |
945 | * tpm2_auto_startup - Perform the standard automatic TPM initialization | |
946 | * sequence | |
947 | * @chip: TPM chip to use | |
948 | * | |
949 | * Returns 0 on success, < 0 in case of fatal error. | |
950 | */ | |
951 | int tpm2_auto_startup(struct tpm_chip *chip) | |
952 | { | |
953 | int rc; | |
954 | ||
955 | rc = tpm_get_timeouts(chip); | |
956 | if (rc) | |
957 | goto out; | |
958 | ||
959 | rc = tpm2_do_selftest(chip); | |
4a29b348 | 960 | if (rc != 0 && rc != TPM2_RC_INITIALIZE) { |
cae8b441 JG |
961 | dev_err(&chip->dev, "TPM self test failed\n"); |
962 | goto out; | |
963 | } | |
964 | ||
965 | if (rc == TPM2_RC_INITIALIZE) { | |
966 | rc = tpm2_startup(chip, TPM2_SU_CLEAR); | |
967 | if (rc) | |
968 | goto out; | |
969 | ||
970 | rc = tpm2_do_selftest(chip); | |
971 | if (rc) { | |
972 | dev_err(&chip->dev, "TPM self test failed\n"); | |
973 | goto out; | |
974 | } | |
975 | } | |
976 | ||
cae8b441 JG |
977 | out: |
978 | if (rc > 0) | |
979 | rc = -ENODEV; | |
980 | return rc; | |
981 | } |