blob: 189e4a5ba59c91c04133a00fde740a3f23df0c53 [file] [log] [blame]
Ilias Apalodimas590fef62020-11-11 11:18:11 +02001// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Defines APIs that allow an OS to interact with UEFI firmware to query
4 * information about the device.
5 * https://trustedcomputinggroup.org/resource/tcg-efi-protocol-specification/
6 *
7 * Copyright (c) 2020, Linaro Limited
8 */
9
10#define LOG_CATEGORY LOGC_EFI
11#include <common.h>
12#include <dm.h>
13#include <efi_loader.h>
Heinrich Schuchardt6f26e7c2021-09-09 08:50:01 +020014#include <efi_variable.h>
Ilias Apalodimas590fef62020-11-11 11:18:11 +020015#include <efi_tcg2.h>
16#include <log.h>
Masahisa Kojima70be5a62021-05-26 12:09:58 +090017#include <malloc.h>
Masahisa Kojimacd1fe7d2021-10-26 17:27:24 +090018#include <smbios.h>
Pali Rohárba87ddf2021-08-02 15:18:31 +020019#include <version_string.h>
Ilias Apalodimas590fef62020-11-11 11:18:11 +020020#include <tpm-v2.h>
Masahisa Kojima70be5a62021-05-26 12:09:58 +090021#include <u-boot/hash-checksum.h>
Ilias Apalodimas967650d2020-11-30 11:47:40 +020022#include <u-boot/sha1.h>
23#include <u-boot/sha256.h>
24#include <u-boot/sha512.h>
Masahisa Kojimad420d8d2021-11-03 11:04:09 +090025#include <linux/unaligned/be_byteshift.h>
26#include <linux/unaligned/le_byteshift.h>
Ilias Apalodimas590fef62020-11-11 11:18:11 +020027#include <linux/unaligned/generic.h>
Ilias Apalodimas967650d2020-11-30 11:47:40 +020028#include <hexdump.h>
Ilias Apalodimas590fef62020-11-11 11:18:11 +020029
Ilias Apalodimas967650d2020-11-30 11:47:40 +020030struct event_log_buffer {
31 void *buffer;
32 void *final_buffer;
33 size_t pos; /* eventlog position */
34 size_t final_pos; /* final events config table position */
35 size_t last_event_size;
36 bool get_event_called;
37 bool truncated;
38};
Ilias Apalodimas590fef62020-11-11 11:18:11 +020039
Ilias Apalodimas967650d2020-11-30 11:47:40 +020040static struct event_log_buffer event_log;
Masahisa Kojima8173cd42021-08-13 16:12:40 +090041static bool tcg2_efi_app_invoked;
Ilias Apalodimas590fef62020-11-11 11:18:11 +020042/*
43 * When requesting TPM2_CAP_TPM_PROPERTIES the value is on a standard offset.
44 * Since the current tpm2_get_capability() response buffers starts at
45 * 'union tpmu_capabilities data' of 'struct tpms_capability_data', calculate
46 * the response size and offset once for all consumers
47 */
48#define TPM2_RESPONSE_BUFFER_SIZE (sizeof(struct tpms_capability_data) - \
49 offsetof(struct tpms_capability_data, data))
50#define properties_offset (offsetof(struct tpml_tagged_tpm_property, tpm_property) + \
51 offsetof(struct tpms_tagged_property, value))
52
Ilias Apalodimas967650d2020-11-30 11:47:40 +020053static const efi_guid_t efi_guid_tcg2_protocol = EFI_TCG2_PROTOCOL_GUID;
54static const efi_guid_t efi_guid_final_events = EFI_TCG2_FINAL_EVENTS_TABLE_GUID;
55
56struct digest_info {
Ilias Apalodimasc67fef62020-11-16 08:52:41 +020057 u16 hash_alg;
58 u32 hash_mask;
Ilias Apalodimas967650d2020-11-30 11:47:40 +020059 u16 hash_len;
60};
61
Ilias Apalodimas190b0a22021-05-25 14:35:31 +030062static const struct digest_info hash_algo_list[] = {
Ilias Apalodimasc67fef62020-11-16 08:52:41 +020063 {
64 TPM2_ALG_SHA1,
65 EFI_TCG2_BOOT_HASH_ALG_SHA1,
Ilias Apalodimas967650d2020-11-30 11:47:40 +020066 TPM2_SHA1_DIGEST_SIZE,
Ilias Apalodimasc67fef62020-11-16 08:52:41 +020067 },
68 {
69 TPM2_ALG_SHA256,
70 EFI_TCG2_BOOT_HASH_ALG_SHA256,
Ilias Apalodimas967650d2020-11-30 11:47:40 +020071 TPM2_SHA256_DIGEST_SIZE,
Ilias Apalodimasc67fef62020-11-16 08:52:41 +020072 },
73 {
74 TPM2_ALG_SHA384,
75 EFI_TCG2_BOOT_HASH_ALG_SHA384,
Ilias Apalodimas967650d2020-11-30 11:47:40 +020076 TPM2_SHA384_DIGEST_SIZE,
Ilias Apalodimasc67fef62020-11-16 08:52:41 +020077 },
78 {
79 TPM2_ALG_SHA512,
80 EFI_TCG2_BOOT_HASH_ALG_SHA512,
Ilias Apalodimas967650d2020-11-30 11:47:40 +020081 TPM2_SHA512_DIGEST_SIZE,
Ilias Apalodimasc67fef62020-11-16 08:52:41 +020082 },
83};
84
Masahisa Kojima21684522021-10-26 17:27:26 +090085struct variable_info {
86 const u16 *name;
87 bool accept_empty;
Masahisa Kojimaf3e0c552021-10-26 17:27:27 +090088 u32 pcr_index;
Masahisa Kojima1d2a6562021-08-13 16:12:39 +090089};
90
Masahisa Kojima21684522021-10-26 17:27:26 +090091static struct variable_info secure_variables[] = {
Masahisa Kojimaf3e0c552021-10-26 17:27:27 +090092 {u"SecureBoot", true, 7},
93 {u"PK", true, 7},
94 {u"KEK", true, 7},
95 {u"db", true, 7},
96 {u"dbx", true, 7},
97 {u"dbt", false, 7},
98 {u"dbr", false, 7},
99 {u"DeployedMode", false, 1},
100 {u"AuditMode", false, 1},
Masahisa Kojima21684522021-10-26 17:27:26 +0900101};
102
Ilias Apalodimasc67fef62020-11-16 08:52:41 +0200103#define MAX_HASH_COUNT ARRAY_SIZE(hash_algo_list)
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200104
Ilias Apalodimasc67fef62020-11-16 08:52:41 +0200105/**
106 * alg_to_mask - Get a TCG hash mask for algorithms
107 *
108 * @hash_alg: TCG defined algorithm
109 *
110 * @Return: TCG hashing algorithm bitmaps, 0 if the algorithm is not supported
111 */
112static u32 alg_to_mask(u16 hash_alg)
113{
Ilias Apalodimas190b0a22021-05-25 14:35:31 +0300114 size_t i;
Ilias Apalodimasc67fef62020-11-16 08:52:41 +0200115
116 for (i = 0; i < MAX_HASH_COUNT; i++) {
117 if (hash_algo_list[i].hash_alg == hash_alg)
118 return hash_algo_list[i].hash_mask;
119 }
120
121 return 0;
122}
123
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200124/**
125 * alg_to_len - Get a TCG hash len for algorithms
126 *
127 * @hash_alg: TCG defined algorithm
128 *
129 * @Return: len of chosen algorithm, 0 if the algorithm is not supported
130 */
131static u16 alg_to_len(u16 hash_alg)
132{
Ilias Apalodimas190b0a22021-05-25 14:35:31 +0300133 size_t i;
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200134
135 for (i = 0; i < MAX_HASH_COUNT; i++) {
136 if (hash_algo_list[i].hash_alg == hash_alg)
137 return hash_algo_list[i].hash_len;
138 }
139
140 return 0;
141}
142
143static u32 tcg_event_final_size(struct tpml_digest_values *digest_list)
144{
145 u32 len;
Ilias Apalodimas190b0a22021-05-25 14:35:31 +0300146 size_t i;
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200147
148 len = offsetof(struct tcg_pcr_event2, digests);
149 len += offsetof(struct tpml_digest_values, digests);
150 for (i = 0; i < digest_list->count; i++) {
151 u16 hash_alg = digest_list->digests[i].hash_alg;
152
153 len += offsetof(struct tpmt_ha, digest);
154 len += alg_to_len(hash_alg);
155 }
156 len += sizeof(u32); /* tcg_pcr_event2 event_size*/
157
158 return len;
159}
160
161/* tcg2_pcr_extend - Extend PCRs for a TPM2 device for a given tpml_digest_values
162 *
163 * @dev: device
164 * @digest_list: list of digest algorithms to extend
165 *
166 * @Return: status code
167 */
168static efi_status_t tcg2_pcr_extend(struct udevice *dev, u32 pcr_index,
169 struct tpml_digest_values *digest_list)
170{
171 u32 rc;
Ilias Apalodimas190b0a22021-05-25 14:35:31 +0300172 size_t i;
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200173
174 for (i = 0; i < digest_list->count; i++) {
175 u32 alg = digest_list->digests[i].hash_alg;
176
177 rc = tpm2_pcr_extend(dev, pcr_index, alg,
178 (u8 *)&digest_list->digests[i].digest,
179 alg_to_len(alg));
180 if (rc) {
181 EFI_PRINT("Failed to extend PCR\n");
182 return EFI_DEVICE_ERROR;
183 }
184 }
185
186 return EFI_SUCCESS;
187}
188
189/* tcg2_agile_log_append - Append an agile event to out eventlog
190 *
191 * @pcr_index: PCR index
192 * @event_type: type of event added
193 * @digest_list: list of digest algorithms to add
194 * @size: size of event
195 * @event: event to add
196 *
197 * @Return: status code
198 */
199static efi_status_t tcg2_agile_log_append(u32 pcr_index, u32 event_type,
200 struct tpml_digest_values *digest_list,
201 u32 size, u8 event[])
202{
Ilias Apalodimas4390e762021-03-30 00:42:36 +0300203 void *log = (void *)((uintptr_t)event_log.buffer + event_log.pos);
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200204 size_t pos;
Ilias Apalodimas190b0a22021-05-25 14:35:31 +0300205 size_t i;
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200206 u32 event_size;
207
208 if (event_log.get_event_called)
Ilias Apalodimas4390e762021-03-30 00:42:36 +0300209 log = (void *)((uintptr_t)event_log.final_buffer +
210 event_log.final_pos);
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200211
212 /*
213 * size refers to the length of event[] only, we need to check against
214 * the final tcg_pcr_event2 size
215 */
216 event_size = size + tcg_event_final_size(digest_list);
217 if (event_log.pos + event_size > TPM2_EVENT_LOG_SIZE ||
218 event_log.final_pos + event_size > TPM2_EVENT_LOG_SIZE) {
219 event_log.truncated = true;
220 return EFI_VOLUME_FULL;
221 }
222
223 put_unaligned_le32(pcr_index, log);
224 pos = offsetof(struct tcg_pcr_event2, event_type);
Ilias Apalodimas4390e762021-03-30 00:42:36 +0300225 put_unaligned_le32(event_type, (void *)((uintptr_t)log + pos));
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200226 pos = offsetof(struct tcg_pcr_event2, digests); /* count */
Ilias Apalodimas4390e762021-03-30 00:42:36 +0300227 put_unaligned_le32(digest_list->count, (void *)((uintptr_t)log + pos));
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200228
229 pos += offsetof(struct tpml_digest_values, digests);
230 for (i = 0; i < digest_list->count; i++) {
231 u16 hash_alg = digest_list->digests[i].hash_alg;
232 u8 *digest = (u8 *)&digest_list->digests[i].digest;
233
Ilias Apalodimas4390e762021-03-30 00:42:36 +0300234 put_unaligned_le16(hash_alg, (void *)((uintptr_t)log + pos));
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200235 pos += offsetof(struct tpmt_ha, digest);
Ilias Apalodimas4390e762021-03-30 00:42:36 +0300236 memcpy((void *)((uintptr_t)log + pos), digest, alg_to_len(hash_alg));
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200237 pos += alg_to_len(hash_alg);
238 }
239
Ilias Apalodimas4390e762021-03-30 00:42:36 +0300240 put_unaligned_le32(size, (void *)((uintptr_t)log + pos));
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200241 pos += sizeof(u32); /* tcg_pcr_event2 event_size*/
Ilias Apalodimas4390e762021-03-30 00:42:36 +0300242 memcpy((void *)((uintptr_t)log + pos), event, size);
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200243 pos += size;
244
245 /* make sure the calculated buffer is what we checked against */
246 if (pos != event_size)
247 return EFI_INVALID_PARAMETER;
248
249 /* if GetEventLog hasn't been called update the normal log */
250 if (!event_log.get_event_called) {
251 event_log.pos += pos;
252 event_log.last_event_size = pos;
253 } else {
254 /* if GetEventLog has been called update config table log */
255 struct efi_tcg2_final_events_table *final_event;
256
257 final_event =
258 (struct efi_tcg2_final_events_table *)(event_log.final_buffer);
259 final_event->number_of_events++;
260 event_log.final_pos += pos;
261 }
262
263 return EFI_SUCCESS;
264}
Ilias Apalodimas590fef62020-11-11 11:18:11 +0200265
266/**
267 * platform_get_tpm_device() - retrieve TPM device
268 *
269 * This function retrieves the udevice implementing a TPM
270 *
271 * This function may be overridden if special initialization is needed.
272 *
273 * @dev: udevice
274 * Return: status code
275 */
276__weak efi_status_t platform_get_tpm2_device(struct udevice **dev)
277{
Ilias Apalodimasc67fef62020-11-16 08:52:41 +0200278 for_each_tpm_device(*dev) {
279 /* Only support TPMv2 devices */
Ilias Apalodimas590fef62020-11-11 11:18:11 +0200280 if (tpm_get_version(*dev) == TPM_V2)
281 return EFI_SUCCESS;
282 }
Ilias Apalodimasc67fef62020-11-16 08:52:41 +0200283
Ilias Apalodimas590fef62020-11-11 11:18:11 +0200284 return EFI_NOT_FOUND;
285}
286
287/**
288 * tpm2_get_max_command_size() - get the supported max command size
289 *
290 * @dev: TPM device
291 * @max_command_size: output buffer for the size
292 *
293 * Return: 0 on success, -1 on error
294 */
295static int tpm2_get_max_command_size(struct udevice *dev, u16 *max_command_size)
296{
297 u8 response[TPM2_RESPONSE_BUFFER_SIZE];
298 u32 ret;
299
300 memset(response, 0, sizeof(response));
301 ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
302 TPM2_PT_MAX_COMMAND_SIZE, response, 1);
303 if (ret)
304 return -1;
305
306 *max_command_size = (uint16_t)get_unaligned_be32(response +
307 properties_offset);
308
309 return 0;
310}
311
312/**
313 * tpm2_get_max_response_size() - get the supported max response size
314 *
315 * @dev: TPM device
316 * @max_response_size: output buffer for the size
317 *
318 * Return: 0 on success, -1 on error
319 */
320static int tpm2_get_max_response_size(struct udevice *dev,
321 u16 *max_response_size)
322{
323 u8 response[TPM2_RESPONSE_BUFFER_SIZE];
324 u32 ret;
325
326 memset(response, 0, sizeof(response));
327 ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
328 TPM2_PT_MAX_RESPONSE_SIZE, response, 1);
329 if (ret)
330 return -1;
331
332 *max_response_size = (uint16_t)get_unaligned_be32(response +
333 properties_offset);
334
335 return 0;
336}
337
338/**
339 * tpm2_get_manufacturer_id() - get the manufacturer ID
340 *
341 * @dev: TPM device
342 * @manufacturer_id: output buffer for the id
343 *
344 * Return: 0 on success, -1 on error
345 */
346static int tpm2_get_manufacturer_id(struct udevice *dev, u32 *manufacturer_id)
347{
348 u8 response[TPM2_RESPONSE_BUFFER_SIZE];
349 u32 ret;
350
351 memset(response, 0, sizeof(response));
352 ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
353 TPM2_PT_MANUFACTURER, response, 1);
354 if (ret)
355 return -1;
356
357 *manufacturer_id = get_unaligned_be32(response + properties_offset);
358
359 return 0;
360}
361
362/**
363 * tpm2_get_num_pcr() - get the number of PCRs
364 *
365 * @dev: TPM device
366 * @manufacturer_id: output buffer for the number
367 *
368 * Return: 0 on success, -1 on error
369 */
370static int tpm2_get_num_pcr(struct udevice *dev, u32 *num_pcr)
371{
372 u8 response[TPM2_RESPONSE_BUFFER_SIZE];
373 u32 ret;
374
375 memset(response, 0, sizeof(response));
376 ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
377 TPM2_PT_PCR_COUNT, response, 1);
378 if (ret)
379 return -1;
380
381 *num_pcr = get_unaligned_be32(response + properties_offset);
382 if (*num_pcr > TPM2_MAX_PCRS)
383 return -1;
384
385 return 0;
386}
387
388/**
389 * is_active_pcr() - Check if a supported algorithm is active
390 *
391 * @dev: TPM device
392 * @selection: struct of PCR information
393 *
394 * Return: true if PCR is active
395 */
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200396static bool is_active_pcr(struct tpms_pcr_selection *selection)
Ilias Apalodimas590fef62020-11-11 11:18:11 +0200397{
398 int i;
399 /*
400 * check the pcr_select. If at least one of the PCRs supports the
401 * algorithm add it on the active ones
402 */
403 for (i = 0; i < selection->size_of_select; i++) {
404 if (selection->pcr_select[i])
405 return true;
406 }
407
408 return false;
409}
410
411/**
412 * tpm2_get_pcr_info() - get the supported, active PCRs and number of banks
413 *
414 * @dev: TPM device
415 * @supported_pcr: bitmask with the algorithms supported
416 * @active_pcr: bitmask with the active algorithms
417 * @pcr_banks: number of PCR banks
418 *
419 * Return: 0 on success, -1 on error
420 */
421static int tpm2_get_pcr_info(struct udevice *dev, u32 *supported_pcr,
422 u32 *active_pcr, u32 *pcr_banks)
423{
424 u8 response[TPM2_RESPONSE_BUFFER_SIZE];
425 struct tpml_pcr_selection pcrs;
426 u32 ret, num_pcr;
Ilias Apalodimas190b0a22021-05-25 14:35:31 +0300427 size_t i;
428 int tpm_ret;
Ilias Apalodimas590fef62020-11-11 11:18:11 +0200429
Ilias Apalodimas09402b12021-05-26 21:01:00 +0300430 *supported_pcr = 0;
431 *active_pcr = 0;
432 *pcr_banks = 0;
Ilias Apalodimas590fef62020-11-11 11:18:11 +0200433 memset(response, 0, sizeof(response));
434 ret = tpm2_get_capability(dev, TPM2_CAP_PCRS, 0, response, 1);
435 if (ret)
436 goto out;
437
438 pcrs.count = get_unaligned_be32(response);
439 /*
440 * We only support 5 algorithms for now so check against that
441 * instead of TPM2_NUM_PCR_BANKS
442 */
443 if (pcrs.count > MAX_HASH_COUNT || pcrs.count < 1)
444 goto out;
445
446 tpm_ret = tpm2_get_num_pcr(dev, &num_pcr);
447 if (tpm_ret)
448 goto out;
449
450 for (i = 0; i < pcrs.count; i++) {
451 /*
452 * Definition of TPMS_PCR_SELECTION Structure
453 * hash: u16
454 * size_of_select: u8
455 * pcr_select: u8 array
456 *
457 * The offsets depend on the number of the device PCRs
458 * so we have to calculate them based on that
459 */
460 u32 hash_offset = offsetof(struct tpml_pcr_selection, selection) +
461 i * offsetof(struct tpms_pcr_selection, pcr_select) +
462 i * ((num_pcr + 7) / 8);
463 u32 size_select_offset =
464 hash_offset + offsetof(struct tpms_pcr_selection,
465 size_of_select);
466 u32 pcr_select_offset =
467 hash_offset + offsetof(struct tpms_pcr_selection,
468 pcr_select);
469
470 pcrs.selection[i].hash =
471 get_unaligned_be16(response + hash_offset);
472 pcrs.selection[i].size_of_select =
473 __get_unaligned_be(response + size_select_offset);
474 if (pcrs.selection[i].size_of_select > TPM2_PCR_SELECT_MAX)
475 goto out;
476 /* copy the array of pcr_select */
477 memcpy(pcrs.selection[i].pcr_select, response + pcr_select_offset,
478 pcrs.selection[i].size_of_select);
479 }
480
481 for (i = 0; i < pcrs.count; i++) {
Ilias Apalodimasc67fef62020-11-16 08:52:41 +0200482 u32 hash_mask = alg_to_mask(pcrs.selection[i].hash);
483
484 if (hash_mask) {
485 *supported_pcr |= hash_mask;
Ilias Apalodimas590fef62020-11-11 11:18:11 +0200486 if (is_active_pcr(&pcrs.selection[i]))
Ilias Apalodimasc67fef62020-11-16 08:52:41 +0200487 *active_pcr |= hash_mask;
488 } else {
489 EFI_PRINT("Unknown algorithm %x\n", pcrs.selection[i].hash);
Ilias Apalodimas590fef62020-11-11 11:18:11 +0200490 }
491 }
492
493 *pcr_banks = pcrs.count;
494
495 return 0;
496out:
497 return -1;
498}
499
500/**
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200501 * __get_active_pcr_banks() - returns the currently active PCR banks
502 *
503 * @active_pcr_banks: pointer for receiving the bitmap of currently
504 * active PCR banks
505 *
506 * Return: status code
507 */
508static efi_status_t __get_active_pcr_banks(u32 *active_pcr_banks)
509{
510 struct udevice *dev;
Ilias Apalodimas09402b12021-05-26 21:01:00 +0300511 u32 active = 0, supported = 0, pcr_banks = 0;
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200512 efi_status_t ret;
513 int err;
514
515 ret = platform_get_tpm2_device(&dev);
516 if (ret != EFI_SUCCESS)
517 goto out;
518
519 err = tpm2_get_pcr_info(dev, &supported, &active, &pcr_banks);
520 if (err) {
521 ret = EFI_DEVICE_ERROR;
522 goto out;
523 }
524
525 *active_pcr_banks = active;
526
527out:
528 return ret;
529}
530
531/* tcg2_create_digest - create a list of digests of the supported PCR banks
532 * for a given memory range
533 *
534 * @input: input memory
535 * @length: length of buffer to calculate the digest
536 * @digest_list: list of digests to fill in
537 *
538 * Return: status code
539 */
540static efi_status_t tcg2_create_digest(const u8 *input, u32 length,
541 struct tpml_digest_values *digest_list)
542{
543 sha1_context ctx;
544 sha256_context ctx_256;
545 sha512_context ctx_512;
Masahisa Kojimaeb74a902021-04-14 11:55:49 +0900546 u8 final[TPM2_SHA512_DIGEST_SIZE];
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200547 efi_status_t ret;
548 u32 active;
Ilias Apalodimas190b0a22021-05-25 14:35:31 +0300549 size_t i;
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200550
551 ret = __get_active_pcr_banks(&active);
552 if (ret != EFI_SUCCESS)
553 return ret;
554
555 digest_list->count = 0;
556 for (i = 0; i < MAX_HASH_COUNT; i++) {
557 u16 hash_alg = hash_algo_list[i].hash_alg;
558
559 if (!(active & alg_to_mask(hash_alg)))
560 continue;
561 switch (hash_alg) {
562 case TPM2_ALG_SHA1:
563 sha1_starts(&ctx);
564 sha1_update(&ctx, input, length);
565 sha1_finish(&ctx, final);
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200566 break;
567 case TPM2_ALG_SHA256:
568 sha256_starts(&ctx_256);
569 sha256_update(&ctx_256, input, length);
570 sha256_finish(&ctx_256, final);
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200571 break;
572 case TPM2_ALG_SHA384:
573 sha384_starts(&ctx_512);
574 sha384_update(&ctx_512, input, length);
575 sha384_finish(&ctx_512, final);
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200576 break;
577 case TPM2_ALG_SHA512:
578 sha512_starts(&ctx_512);
579 sha512_update(&ctx_512, input, length);
580 sha512_finish(&ctx_512, final);
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200581 break;
582 default:
583 EFI_PRINT("Unsupported algorithm %x\n", hash_alg);
584 return EFI_INVALID_PARAMETER;
585 }
Ruchika Guptae53007b2021-09-14 12:14:31 +0530586 digest_list->digests[digest_list->count].hash_alg = hash_alg;
587 memcpy(&digest_list->digests[digest_list->count].digest, final,
588 (u32)alg_to_len(hash_alg));
Ilias Apalodimas754b3a42021-04-22 14:32:14 +0300589 digest_list->count++;
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200590 }
591
592 return EFI_SUCCESS;
593}
594
595/**
Ilias Apalodimasc67fef62020-11-16 08:52:41 +0200596 * efi_tcg2_get_capability() - protocol capability information and state information
Ilias Apalodimas590fef62020-11-11 11:18:11 +0200597 *
598 * @this: TCG2 protocol instance
599 * @capability: caller allocated memory with size field to the size of
600 * the structure allocated
601
602 * Return: status code
603 */
604static efi_status_t EFIAPI
Ilias Apalodimasc67fef62020-11-16 08:52:41 +0200605efi_tcg2_get_capability(struct efi_tcg2_protocol *this,
606 struct efi_tcg2_boot_service_capability *capability)
Ilias Apalodimas590fef62020-11-11 11:18:11 +0200607{
608 struct udevice *dev;
609 efi_status_t efi_ret;
610 int ret;
611
612 EFI_ENTRY("%p, %p", this, capability);
613
614 if (!this || !capability) {
615 efi_ret = EFI_INVALID_PARAMETER;
616 goto out;
617 }
618
Masahisa Kojima9cc82932021-09-06 12:04:12 +0900619 if (capability->size < BOOT_SERVICE_CAPABILITY_MIN) {
620 capability->size = BOOT_SERVICE_CAPABILITY_MIN;
Ilias Apalodimas590fef62020-11-11 11:18:11 +0200621 efi_ret = EFI_BUFFER_TOO_SMALL;
622 goto out;
623 }
624
625 if (capability->size < sizeof(*capability)) {
626 capability->size = sizeof(*capability);
627 efi_ret = EFI_BUFFER_TOO_SMALL;
628 goto out;
629 }
630
631 capability->structure_version.major = 1;
632 capability->structure_version.minor = 1;
633 capability->protocol_version.major = 1;
634 capability->protocol_version.minor = 1;
635
636 efi_ret = platform_get_tpm2_device(&dev);
637 if (efi_ret != EFI_SUCCESS) {
638 capability->supported_event_logs = 0;
639 capability->hash_algorithm_bitmap = 0;
640 capability->tpm_present_flag = false;
641 capability->max_command_size = 0;
642 capability->max_response_size = 0;
643 capability->manufacturer_id = 0;
644 capability->number_of_pcr_banks = 0;
645 capability->active_pcr_banks = 0;
646
647 efi_ret = EFI_SUCCESS;
648 goto out;
649 }
650
651 /* We only allow a TPMv2 device to register the EFI protocol */
652 capability->supported_event_logs = TCG2_EVENT_LOG_FORMAT_TCG_2;
653
654 capability->tpm_present_flag = true;
655
656 /* Supported and active PCRs */
657 capability->hash_algorithm_bitmap = 0;
658 capability->active_pcr_banks = 0;
659 ret = tpm2_get_pcr_info(dev, &capability->hash_algorithm_bitmap,
660 &capability->active_pcr_banks,
661 &capability->number_of_pcr_banks);
662 if (ret) {
663 efi_ret = EFI_DEVICE_ERROR;
664 goto out;
665 }
666
667 /* Max command size */
668 ret = tpm2_get_max_command_size(dev, &capability->max_command_size);
669 if (ret) {
670 efi_ret = EFI_DEVICE_ERROR;
671 goto out;
672 }
673
674 /* Max response size */
675 ret = tpm2_get_max_response_size(dev, &capability->max_response_size);
676 if (ret) {
677 efi_ret = EFI_DEVICE_ERROR;
678 goto out;
679 }
680
681 /* Manufacturer ID */
682 ret = tpm2_get_manufacturer_id(dev, &capability->manufacturer_id);
683 if (ret) {
684 efi_ret = EFI_DEVICE_ERROR;
685 goto out;
686 }
687
688 return EFI_EXIT(EFI_SUCCESS);
689out:
690 return EFI_EXIT(efi_ret);
691}
692
693/**
Ilias Apalodimasc67fef62020-11-16 08:52:41 +0200694 * efi_tcg2_get_eventlog() - retrieve the the address of an event log and its
695 * last entry
Ilias Apalodimas590fef62020-11-11 11:18:11 +0200696 *
697 * @this: TCG2 protocol instance
698 * @log_format: type of event log format
699 * @event_log_location: pointer to the memory address of the event log
700 * @event_log_last_entry: pointer to the address of the start of the last
701 * entry in the event log in memory, if log contains
702 * more than 1 entry
703 * @event_log_truncated: set to true, if the Event Log is missing at i
704 * least one entry
705 *
706 * Return: status code
707 */
708static efi_status_t EFIAPI
Ilias Apalodimasc67fef62020-11-16 08:52:41 +0200709efi_tcg2_get_eventlog(struct efi_tcg2_protocol *this,
710 efi_tcg_event_log_format log_format,
711 u64 *event_log_location, u64 *event_log_last_entry,
712 bool *event_log_truncated)
Ilias Apalodimas590fef62020-11-11 11:18:11 +0200713{
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200714 efi_status_t ret = EFI_SUCCESS;
715 struct udevice *dev;
716
717 EFI_ENTRY("%p, %u, %p, %p, %p", this, log_format, event_log_location,
718 event_log_last_entry, event_log_truncated);
719
Masahisa Kojima7c5fccd2021-09-03 10:55:50 +0900720 if (!this || !event_log_location || !event_log_last_entry ||
721 !event_log_truncated) {
722 ret = EFI_INVALID_PARAMETER;
723 goto out;
724 }
725
726 /* Only support TPMV2 */
727 if (log_format != TCG2_EVENT_LOG_FORMAT_TCG_2) {
728 ret = EFI_INVALID_PARAMETER;
729 goto out;
730 }
731
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200732 ret = platform_get_tpm2_device(&dev);
733 if (ret != EFI_SUCCESS) {
734 event_log_location = NULL;
735 event_log_last_entry = NULL;
736 *event_log_truncated = false;
737 ret = EFI_SUCCESS;
738 goto out;
739 }
740 *event_log_location = (uintptr_t)event_log.buffer;
741 *event_log_last_entry = (uintptr_t)(event_log.buffer + event_log.pos -
742 event_log.last_event_size);
743 *event_log_truncated = event_log.truncated;
744 event_log.get_event_called = true;
745
746out:
747 return EFI_EXIT(ret);
Ilias Apalodimas590fef62020-11-11 11:18:11 +0200748}
749
750/**
Masahisa Kojima70be5a62021-05-26 12:09:58 +0900751 * tcg2_hash_pe_image() - calculate PE/COFF image hash
752 *
753 * @efi: pointer to the EFI binary
754 * @efi_size: size of @efi binary
755 * @digest_list: list of digest algorithms to extend
756 *
757 * Return: status code
758 */
759static efi_status_t tcg2_hash_pe_image(void *efi, u64 efi_size,
760 struct tpml_digest_values *digest_list)
761{
762 WIN_CERTIFICATE *wincerts = NULL;
763 size_t wincerts_len;
764 struct efi_image_regions *regs = NULL;
765 void *new_efi = NULL;
766 u8 hash[TPM2_SHA512_DIGEST_SIZE];
767 efi_status_t ret;
768 u32 active;
769 int i;
770
771 new_efi = efi_prepare_aligned_image(efi, &efi_size);
772 if (!new_efi)
773 return EFI_OUT_OF_RESOURCES;
774
775 if (!efi_image_parse(new_efi, efi_size, &regs, &wincerts,
776 &wincerts_len)) {
777 log_err("Parsing PE executable image failed\n");
778 ret = EFI_UNSUPPORTED;
779 goto out;
780 }
781
782 ret = __get_active_pcr_banks(&active);
783 if (ret != EFI_SUCCESS) {
784 goto out;
785 }
786
787 digest_list->count = 0;
788 for (i = 0; i < MAX_HASH_COUNT; i++) {
789 u16 hash_alg = hash_algo_list[i].hash_alg;
790
791 if (!(active & alg_to_mask(hash_alg)))
792 continue;
793 switch (hash_alg) {
794 case TPM2_ALG_SHA1:
795 hash_calculate("sha1", regs->reg, regs->num, hash);
796 break;
797 case TPM2_ALG_SHA256:
798 hash_calculate("sha256", regs->reg, regs->num, hash);
799 break;
800 case TPM2_ALG_SHA384:
801 hash_calculate("sha384", regs->reg, regs->num, hash);
802 break;
803 case TPM2_ALG_SHA512:
804 hash_calculate("sha512", regs->reg, regs->num, hash);
805 break;
806 default:
807 EFI_PRINT("Unsupported algorithm %x\n", hash_alg);
808 return EFI_INVALID_PARAMETER;
809 }
Ruchika Guptae53007b2021-09-14 12:14:31 +0530810 digest_list->digests[digest_list->count].hash_alg = hash_alg;
811 memcpy(&digest_list->digests[digest_list->count].digest, hash,
812 (u32)alg_to_len(hash_alg));
Masahisa Kojima70be5a62021-05-26 12:09:58 +0900813 digest_list->count++;
814 }
815
816out:
817 if (new_efi != efi)
818 free(new_efi);
819 free(regs);
820
821 return ret;
822}
823
824/**
825 * tcg2_measure_pe_image() - measure PE/COFF image
826 *
827 * @efi: pointer to the EFI binary
828 * @efi_size: size of @efi binary
829 * @handle: loaded image handle
830 * @loaded_image: loaded image protocol
831 *
832 * Return: status code
833 */
834efi_status_t tcg2_measure_pe_image(void *efi, u64 efi_size,
835 struct efi_loaded_image_obj *handle,
836 struct efi_loaded_image *loaded_image)
837{
838 struct tpml_digest_values digest_list;
839 efi_status_t ret;
840 struct udevice *dev;
841 u32 pcr_index, event_type, event_size;
842 struct uefi_image_load_event *image_load_event;
843 struct efi_device_path *device_path;
844 u32 device_path_length;
845 IMAGE_DOS_HEADER *dos;
846 IMAGE_NT_HEADERS32 *nt;
847 struct efi_handler *handler;
848
849 ret = platform_get_tpm2_device(&dev);
850 if (ret != EFI_SUCCESS)
851 return ret;
852
853 switch (handle->image_type) {
854 case IMAGE_SUBSYSTEM_EFI_APPLICATION:
855 pcr_index = 4;
856 event_type = EV_EFI_BOOT_SERVICES_APPLICATION;
857 break;
858 case IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER:
859 pcr_index = 2;
860 event_type = EV_EFI_BOOT_SERVICES_DRIVER;
861 break;
862 case IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER:
863 pcr_index = 2;
864 event_type = EV_EFI_RUNTIME_SERVICES_DRIVER;
865 break;
866 default:
867 return EFI_UNSUPPORTED;
868 }
869
870 ret = tcg2_hash_pe_image(efi, efi_size, &digest_list);
871 if (ret != EFI_SUCCESS)
872 return ret;
873
874 ret = tcg2_pcr_extend(dev, pcr_index, &digest_list);
875 if (ret != EFI_SUCCESS)
876 return ret;
877
Ilias Apalodimas26753c02021-09-09 00:30:49 +0300878 ret = efi_search_protocol(&handle->header,
879 &efi_guid_loaded_image_device_path, &handler);
Masahisa Kojima70be5a62021-05-26 12:09:58 +0900880 if (ret != EFI_SUCCESS)
881 return ret;
882
Ilias Apalodimas26753c02021-09-09 00:30:49 +0300883 device_path = handler->protocol_interface;
Masahisa Kojima70be5a62021-05-26 12:09:58 +0900884 device_path_length = efi_dp_size(device_path);
885 if (device_path_length > 0) {
886 /* add end node size */
887 device_path_length += sizeof(struct efi_device_path);
888 }
889 event_size = sizeof(struct uefi_image_load_event) + device_path_length;
Ilias Apalodimas26753c02021-09-09 00:30:49 +0300890 image_load_event = calloc(1, event_size);
Masahisa Kojima70be5a62021-05-26 12:09:58 +0900891 if (!image_load_event)
892 return EFI_OUT_OF_RESOURCES;
893
894 image_load_event->image_location_in_memory = (uintptr_t)efi;
895 image_load_event->image_length_in_memory = efi_size;
896 image_load_event->length_of_device_path = device_path_length;
897
898 dos = (IMAGE_DOS_HEADER *)efi;
899 nt = (IMAGE_NT_HEADERS32 *)(efi + dos->e_lfanew);
900 if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC) {
901 IMAGE_NT_HEADERS64 *nt64 = (IMAGE_NT_HEADERS64 *)nt;
902
903 image_load_event->image_link_time_address =
904 nt64->OptionalHeader.ImageBase;
905 } else if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
906 image_load_event->image_link_time_address =
907 nt->OptionalHeader.ImageBase;
908 } else {
909 ret = EFI_INVALID_PARAMETER;
910 goto out;
911 }
912
Ilias Apalodimas26753c02021-09-09 00:30:49 +0300913 /* device_path_length might be zero */
914 memcpy(image_load_event->device_path, device_path, device_path_length);
Masahisa Kojima70be5a62021-05-26 12:09:58 +0900915
916 ret = tcg2_agile_log_append(pcr_index, event_type, &digest_list,
917 event_size, (u8 *)image_load_event);
918
919out:
920 free(image_load_event);
921
922 return ret;
923}
924
925/**
Ilias Apalodimasc67fef62020-11-16 08:52:41 +0200926 * efi_tcg2_hash_log_extend_event() - extend and optionally log events
Ilias Apalodimas590fef62020-11-11 11:18:11 +0200927 *
928 * @this: TCG2 protocol instance
929 * @flags: bitmap providing additional information on the
930 * operation
931 * @data_to_hash: physical address of the start of the data buffer
932 * to be hashed
933 * @data_to_hash_len: the length in bytes of the buffer referenced by
934 * data_to_hash
935 * @efi_tcg_event: pointer to data buffer containing information
936 * about the event
937 *
938 * Return: status code
939 */
940static efi_status_t EFIAPI
Ilias Apalodimasc67fef62020-11-16 08:52:41 +0200941efi_tcg2_hash_log_extend_event(struct efi_tcg2_protocol *this, u64 flags,
942 u64 data_to_hash, u64 data_to_hash_len,
943 struct efi_tcg2_event *efi_tcg_event)
Ilias Apalodimas590fef62020-11-11 11:18:11 +0200944{
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200945 struct udevice *dev;
946 efi_status_t ret;
947 u32 event_type, pcr_index, event_size;
948 struct tpml_digest_values digest_list;
949
950 EFI_ENTRY("%p, %llu, %llu, %llu, %p", this, flags, data_to_hash,
951 data_to_hash_len, efi_tcg_event);
952
953 if (!this || !data_to_hash || !efi_tcg_event) {
954 ret = EFI_INVALID_PARAMETER;
955 goto out;
956 }
957
958 ret = platform_get_tpm2_device(&dev);
959 if (ret != EFI_SUCCESS)
960 goto out;
961
962 if (efi_tcg_event->size < efi_tcg_event->header.header_size +
963 sizeof(u32)) {
964 ret = EFI_INVALID_PARAMETER;
965 goto out;
966 }
967
Masahisa Kojimab8074912021-09-03 10:55:52 +0900968 if (efi_tcg_event->header.pcr_index > EFI_TCG2_MAX_PCR_INDEX) {
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200969 ret = EFI_INVALID_PARAMETER;
970 goto out;
971 }
972
973 /*
974 * if PE_COFF_IMAGE is set we need to make sure the image is not
975 * corrupted, verify it and hash the PE/COFF image in accordance with
Masahisa Kojima70be5a62021-05-26 12:09:58 +0900976 * the procedure specified in "Calculating the PE Image Hash"
977 * section of the "Windows Authenticode Portable Executable Signature
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200978 * Format"
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200979 */
980 if (flags & PE_COFF_IMAGE) {
Masahisa Kojima70be5a62021-05-26 12:09:58 +0900981 IMAGE_NT_HEADERS32 *nt;
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200982
Masahisa Kojima70be5a62021-05-26 12:09:58 +0900983 ret = efi_check_pe((void *)(uintptr_t)data_to_hash,
984 data_to_hash_len, (void **)&nt);
985 if (ret != EFI_SUCCESS) {
986 log_err("Not a valid PE-COFF file\n");
Masahisa Kojima7c5fccd2021-09-03 10:55:50 +0900987 ret = EFI_UNSUPPORTED;
Masahisa Kojima70be5a62021-05-26 12:09:58 +0900988 goto out;
989 }
990 ret = tcg2_hash_pe_image((void *)(uintptr_t)data_to_hash,
991 data_to_hash_len, &digest_list);
992 } else {
993 ret = tcg2_create_digest((u8 *)(uintptr_t)data_to_hash,
994 data_to_hash_len, &digest_list);
995 }
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200996
Ilias Apalodimas967650d2020-11-30 11:47:40 +0200997 if (ret != EFI_SUCCESS)
998 goto out;
999
Masahisa Kojima70be5a62021-05-26 12:09:58 +09001000 pcr_index = efi_tcg_event->header.pcr_index;
1001 event_type = efi_tcg_event->header.event_type;
1002
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001003 ret = tcg2_pcr_extend(dev, pcr_index, &digest_list);
1004 if (ret != EFI_SUCCESS)
1005 goto out;
1006
1007 if (flags & EFI_TCG2_EXTEND_ONLY) {
1008 if (event_log.truncated)
1009 ret = EFI_VOLUME_FULL;
1010 goto out;
1011 }
1012
1013 /*
1014 * The efi_tcg_event size includes the size component and the
1015 * headersize
1016 */
1017 event_size = efi_tcg_event->size - sizeof(efi_tcg_event->size) -
1018 efi_tcg_event->header.header_size;
1019 ret = tcg2_agile_log_append(pcr_index, event_type, &digest_list,
1020 event_size, efi_tcg_event->event);
1021out:
1022 return EFI_EXIT(ret);
Ilias Apalodimas590fef62020-11-11 11:18:11 +02001023}
1024
1025/**
Ilias Apalodimasc67fef62020-11-16 08:52:41 +02001026 * efi_tcg2_submit_command() - Send command to the TPM
Ilias Apalodimas590fef62020-11-11 11:18:11 +02001027 *
1028 * @this: TCG2 protocol instance
1029 * @input_param_block_size: size of the TPM input parameter block
1030 * @input_param_block: pointer to the TPM input parameter block
1031 * @output_param_block_size: size of the TPM output parameter block
1032 * @output_param_block: pointer to the TPM output parameter block
1033 *
1034 * Return: status code
1035 */
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001036static efi_status_t EFIAPI
Masahisa Kojima06ef6b62021-11-04 22:59:16 +09001037efi_tcg2_submit_command(struct efi_tcg2_protocol *this,
1038 u32 input_param_block_size,
1039 u8 *input_param_block,
1040 u32 output_param_block_size,
1041 u8 *output_param_block)
Ilias Apalodimas590fef62020-11-11 11:18:11 +02001042{
Masahisa Kojima06ef6b62021-11-04 22:59:16 +09001043 struct udevice *dev;
1044 efi_status_t ret;
1045 u32 rc;
1046 size_t resp_buf_size = output_param_block_size;
1047
1048 EFI_ENTRY("%p, %u, %p, %u, %p", this, input_param_block_size,
1049 input_param_block, output_param_block_size, output_param_block);
1050
1051 if (!this || !input_param_block || !input_param_block_size) {
1052 ret = EFI_INVALID_PARAMETER;
1053 goto out;
1054 }
1055
1056 ret = platform_get_tpm2_device(&dev);
1057 if (ret != EFI_SUCCESS)
1058 goto out;
1059
1060 rc = tpm2_submit_command(dev, input_param_block,
1061 output_param_block, &resp_buf_size);
1062 if (rc) {
1063 ret = (rc == -ENOSPC) ? EFI_OUT_OF_RESOURCES : EFI_DEVICE_ERROR;
1064
1065 goto out;
1066 }
1067
1068out:
1069 return EFI_EXIT(ret);
Ilias Apalodimas590fef62020-11-11 11:18:11 +02001070}
1071
1072/**
Ilias Apalodimasc67fef62020-11-16 08:52:41 +02001073 * efi_tcg2_get_active_pcr_banks() - returns the currently active PCR banks
Ilias Apalodimas590fef62020-11-11 11:18:11 +02001074 *
1075 * @this: TCG2 protocol instance
1076 * @active_pcr_banks: pointer for receiving the bitmap of currently
1077 * active PCR banks
1078 *
1079 * Return: status code
1080 */
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001081static efi_status_t EFIAPI
Ilias Apalodimasc67fef62020-11-16 08:52:41 +02001082efi_tcg2_get_active_pcr_banks(struct efi_tcg2_protocol *this,
1083 u32 *active_pcr_banks)
Ilias Apalodimas590fef62020-11-11 11:18:11 +02001084{
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001085 efi_status_t ret;
1086
Masahisa Kojima7c5fccd2021-09-03 10:55:50 +09001087 if (!this || !active_pcr_banks) {
1088 ret = EFI_INVALID_PARAMETER;
1089 goto out;
1090 }
1091
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001092 EFI_ENTRY("%p, %p", this, active_pcr_banks);
1093 ret = __get_active_pcr_banks(active_pcr_banks);
1094
Masahisa Kojima7c5fccd2021-09-03 10:55:50 +09001095out:
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001096 return EFI_EXIT(ret);
Ilias Apalodimas590fef62020-11-11 11:18:11 +02001097}
1098
1099/**
Ilias Apalodimasc67fef62020-11-16 08:52:41 +02001100 * efi_tcg2_set_active_pcr_banks() - sets the currently active PCR banks
Ilias Apalodimas590fef62020-11-11 11:18:11 +02001101 *
1102 * @this: TCG2 protocol instance
1103 * @active_pcr_banks: bitmap of the requested active PCR banks
1104 *
1105 * Return: status code
1106 */
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001107static efi_status_t EFIAPI
Ilias Apalodimas190b0a22021-05-25 14:35:31 +03001108efi_tcg2_set_active_pcr_banks(__maybe_unused struct efi_tcg2_protocol *this,
1109 u32 __maybe_unused active_pcr_banks)
Ilias Apalodimas590fef62020-11-11 11:18:11 +02001110{
1111 return EFI_UNSUPPORTED;
1112}
1113
1114/**
Ilias Apalodimasc67fef62020-11-16 08:52:41 +02001115 * efi_tcg2_get_result_of_set_active_pcr_banks() - retrieve result for previous
1116 * set_active_pcr_banks()
Ilias Apalodimas590fef62020-11-11 11:18:11 +02001117 *
1118 * @this: TCG2 protocol instance
1119 * @operation_present: non-zero value to indicate a
1120 * set_active_pcr_banks operation was
1121 * invoked during last boot
1122 * @response: result value could be returned
1123 *
1124 * Return: status code
1125 */
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001126static efi_status_t EFIAPI
Ilias Apalodimas190b0a22021-05-25 14:35:31 +03001127efi_tcg2_get_result_of_set_active_pcr_banks(__maybe_unused struct efi_tcg2_protocol *this,
1128 u32 __maybe_unused *operation_present,
1129 u32 __maybe_unused *response)
Ilias Apalodimas590fef62020-11-11 11:18:11 +02001130{
1131 return EFI_UNSUPPORTED;
1132}
1133
1134static const struct efi_tcg2_protocol efi_tcg2_protocol = {
Ilias Apalodimasc67fef62020-11-16 08:52:41 +02001135 .get_capability = efi_tcg2_get_capability,
1136 .get_eventlog = efi_tcg2_get_eventlog,
1137 .hash_log_extend_event = efi_tcg2_hash_log_extend_event,
1138 .submit_command = efi_tcg2_submit_command,
1139 .get_active_pcr_banks = efi_tcg2_get_active_pcr_banks,
1140 .set_active_pcr_banks = efi_tcg2_set_active_pcr_banks,
1141 .get_result_of_set_active_pcr_banks = efi_tcg2_get_result_of_set_active_pcr_banks,
Ilias Apalodimas590fef62020-11-11 11:18:11 +02001142};
1143
1144/**
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001145 * create_specid_event() - Create the first event in the eventlog
1146 *
1147 * @dev: tpm device
1148 * @event_header: Pointer to the final event header
1149 * @event_size: final spec event size
1150 *
1151 * Return: status code
1152 */
1153static efi_status_t create_specid_event(struct udevice *dev, void *buffer,
1154 size_t *event_size)
1155{
1156 struct tcg_efi_spec_id_event *spec_event;
1157 size_t spec_event_size;
1158 efi_status_t ret = EFI_DEVICE_ERROR;
Ruchika Guptae53007b2021-09-14 12:14:31 +05301159 u32 active = 0, supported = 0, pcr_count = 0, alg_count = 0;
Ilias Apalodimas190b0a22021-05-25 14:35:31 +03001160 int err;
1161 size_t i;
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001162
1163 /*
1164 * Create Spec event. This needs to be the first event in the log
1165 * according to the TCG EFI protocol spec
1166 */
1167
1168 /* Setup specID event data */
1169 spec_event = (struct tcg_efi_spec_id_event *)buffer;
1170 memcpy(spec_event->signature, TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03,
1171 sizeof(spec_event->signature));
1172 put_unaligned_le32(0, &spec_event->platform_class); /* type client */
1173 spec_event->spec_version_minor =
1174 TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MINOR_TPM2;
1175 spec_event->spec_version_major =
1176 TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MAJOR_TPM2;
1177 spec_event->spec_errata =
1178 TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_ERRATA_TPM2;
1179 spec_event->uintn_size = sizeof(efi_uintn_t) / sizeof(u32);
1180
Ruchika Guptae53007b2021-09-14 12:14:31 +05301181 err = tpm2_get_pcr_info(dev, &supported, &active, &pcr_count);
1182
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001183 if (err)
1184 goto out;
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001185
Ruchika Guptae53007b2021-09-14 12:14:31 +05301186 for (i = 0; i < pcr_count; i++) {
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001187 u16 hash_alg = hash_algo_list[i].hash_alg;
1188 u16 hash_len = hash_algo_list[i].hash_len;
1189
Ruchika Guptae53007b2021-09-14 12:14:31 +05301190 if (active & alg_to_mask(hash_alg)) {
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001191 put_unaligned_le16(hash_alg,
Ruchika Guptae53007b2021-09-14 12:14:31 +05301192 &spec_event->digest_sizes[alg_count].algorithm_id);
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001193 put_unaligned_le16(hash_len,
Ruchika Guptae53007b2021-09-14 12:14:31 +05301194 &spec_event->digest_sizes[alg_count].digest_size);
1195 alg_count++;
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001196 }
1197 }
Ruchika Guptae53007b2021-09-14 12:14:31 +05301198
1199 spec_event->number_of_algorithms = alg_count;
1200 if (spec_event->number_of_algorithms > MAX_HASH_COUNT ||
1201 spec_event->number_of_algorithms < 1)
1202 goto out;
1203
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001204 /*
1205 * the size of the spec event and placement of vendor_info_size
1206 * depends on supported algoriths
1207 */
1208 spec_event_size =
1209 offsetof(struct tcg_efi_spec_id_event, digest_sizes) +
1210 spec_event->number_of_algorithms * sizeof(spec_event->digest_sizes[0]);
1211 /* no vendor info for us */
Ruchika Guptae53007b2021-09-14 12:14:31 +05301212 memset(buffer + spec_event_size, 0, 1);
1213 /* add a byte for vendor_info_size in the spec event */
1214 spec_event_size += 1;
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001215 *event_size = spec_event_size;
1216
1217 return EFI_SUCCESS;
1218
1219out:
1220 return ret;
1221}
1222
1223/**
Ilias Apalodimas1b278e62021-03-25 13:31:45 +02001224 * tcg2_uninit - remove the final event table and free efi memory on failures
1225 */
1226void tcg2_uninit(void)
1227{
1228 efi_status_t ret;
1229
1230 ret = efi_install_configuration_table(&efi_guid_final_events, NULL);
1231 if (ret != EFI_SUCCESS)
1232 log_err("Failed to delete final events config table\n");
1233
1234 efi_free_pool(event_log.buffer);
1235 event_log.buffer = NULL;
1236 efi_free_pool(event_log.final_buffer);
1237 event_log.final_buffer = NULL;
1238}
1239
1240/**
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001241 * create_final_event() - Create the final event and install the config
1242 * defined by the TCG EFI spec
1243 */
1244static efi_status_t create_final_event(void)
1245{
1246 struct efi_tcg2_final_events_table *final_event;
1247 efi_status_t ret;
1248
1249 /*
1250 * All events generated after the invocation of
1251 * EFI_TCG2_GET_EVENT_LOGS need to be stored in an instance of an
1252 * EFI_CONFIGURATION_TABLE
1253 */
1254 ret = efi_allocate_pool(EFI_ACPI_MEMORY_NVS, TPM2_EVENT_LOG_SIZE,
1255 &event_log.final_buffer);
1256 if (ret != EFI_SUCCESS)
1257 goto out;
1258
1259 memset(event_log.final_buffer, 0xff, TPM2_EVENT_LOG_SIZE);
1260 final_event = event_log.final_buffer;
1261 final_event->number_of_events = 0;
1262 final_event->version = EFI_TCG2_FINAL_EVENTS_TABLE_VERSION;
1263 event_log.final_pos = sizeof(*final_event);
1264 ret = efi_install_configuration_table(&efi_guid_final_events,
1265 final_event);
Ilias Apalodimas5a2baf92021-05-12 00:03:41 +03001266 if (ret != EFI_SUCCESS) {
1267 efi_free_pool(event_log.final_buffer);
1268 event_log.final_buffer = NULL;
1269 }
1270
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001271out:
1272 return ret;
1273}
1274
1275/**
1276 * efi_init_event_log() - initialize an eventlog
1277 */
1278static efi_status_t efi_init_event_log(void)
1279{
1280 /*
1281 * vendor_info_size is currently set to 0, we need to change the length
1282 * and allocate the flexible array member if this changes
1283 */
1284 struct tcg_pcr_event *event_header = NULL;
1285 struct udevice *dev;
1286 size_t spec_event_size;
1287 efi_status_t ret;
1288
1289 ret = platform_get_tpm2_device(&dev);
1290 if (ret != EFI_SUCCESS)
1291 goto out;
1292
1293 ret = efi_allocate_pool(EFI_BOOT_SERVICES_DATA, TPM2_EVENT_LOG_SIZE,
1294 (void **)&event_log.buffer);
1295 if (ret != EFI_SUCCESS)
1296 goto out;
1297
1298 /*
1299 * initialize log area as 0xff so the OS can easily figure out the
1300 * last log entry
1301 */
1302 memset(event_log.buffer, 0xff, TPM2_EVENT_LOG_SIZE);
1303 event_log.pos = 0;
1304 event_log.last_event_size = 0;
1305 event_log.get_event_called = false;
1306 event_log.truncated = false;
1307
1308 /*
1309 * The log header is defined to be in SHA1 event log entry format.
1310 * Setup event header
1311 */
1312 event_header = (struct tcg_pcr_event *)event_log.buffer;
1313 put_unaligned_le32(0, &event_header->pcr_index);
1314 put_unaligned_le32(EV_NO_ACTION, &event_header->event_type);
1315 memset(&event_header->digest, 0, sizeof(event_header->digest));
Ilias Apalodimas4390e762021-03-30 00:42:36 +03001316 ret = create_specid_event(dev, (void *)((uintptr_t)event_log.buffer + sizeof(*event_header)),
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001317 &spec_event_size);
1318 if (ret != EFI_SUCCESS)
Ilias Apalodimas5a2baf92021-05-12 00:03:41 +03001319 goto free_pool;
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001320 put_unaligned_le32(spec_event_size, &event_header->event_size);
1321 event_log.pos = spec_event_size + sizeof(*event_header);
1322 event_log.last_event_size = event_log.pos;
1323
1324 ret = create_final_event();
Ilias Apalodimas5a2baf92021-05-12 00:03:41 +03001325 if (ret != EFI_SUCCESS)
1326 goto free_pool;
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001327
1328out:
1329 return ret;
Ilias Apalodimas5a2baf92021-05-12 00:03:41 +03001330
1331free_pool:
1332 efi_free_pool(event_log.buffer);
1333 event_log.buffer = NULL;
1334 return ret;
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001335}
1336
1337/**
Masahisa Kojima1d2a6562021-08-13 16:12:39 +09001338 * tcg2_measure_event() - common function to add event log and extend PCR
1339 *
1340 * @dev: TPM device
1341 * @pcr_index: PCR index
1342 * @event_type: type of event added
1343 * @size: event size
1344 * @event: event data
1345 *
1346 * Return: status code
1347 */
1348static efi_status_t
1349tcg2_measure_event(struct udevice *dev, u32 pcr_index, u32 event_type,
1350 u32 size, u8 event[])
1351{
1352 struct tpml_digest_values digest_list;
1353 efi_status_t ret;
1354
1355 ret = tcg2_create_digest(event, size, &digest_list);
1356 if (ret != EFI_SUCCESS)
1357 goto out;
1358
1359 ret = tcg2_pcr_extend(dev, pcr_index, &digest_list);
1360 if (ret != EFI_SUCCESS)
1361 goto out;
1362
1363 ret = tcg2_agile_log_append(pcr_index, event_type, &digest_list,
1364 size, event);
1365
1366out:
1367 return ret;
1368}
1369
1370/**
Ilias Apalodimasf576f7d2021-03-24 16:50:46 +02001371 * efi_append_scrtm_version - Append an S-CRTM EV_S_CRTM_VERSION event on the
1372 * eventlog and extend the PCRs
1373 *
1374 * @dev: TPM device
1375 *
1376 * @Return: status code
1377 */
1378static efi_status_t efi_append_scrtm_version(struct udevice *dev)
1379{
Ilias Apalodimasf576f7d2021-03-24 16:50:46 +02001380 efi_status_t ret;
1381
Pali Rohár144d6422021-08-02 15:18:30 +02001382 ret = tcg2_measure_event(dev, 0, EV_S_CRTM_VERSION,
1383 strlen(version_string) + 1,
1384 (u8 *)version_string);
Ilias Apalodimasf576f7d2021-03-24 16:50:46 +02001385
Ilias Apalodimasf576f7d2021-03-24 16:50:46 +02001386 return ret;
1387}
1388
1389/**
Masahisa Kojima1d2a6562021-08-13 16:12:39 +09001390 * tcg2_measure_variable() - add variable event log and extend PCR
1391 *
1392 * @dev: TPM device
1393 * @pcr_index: PCR index
1394 * @event_type: type of event added
1395 * @var_name: variable name
1396 * @guid: guid
1397 * @data_size: variable data size
1398 * @data: variable data
1399 *
1400 * Return: status code
1401 */
1402static efi_status_t tcg2_measure_variable(struct udevice *dev, u32 pcr_index,
Heinrich Schuchardt1ad2f0d2021-09-09 07:12:14 +02001403 u32 event_type, const u16 *var_name,
Masahisa Kojima1d2a6562021-08-13 16:12:39 +09001404 const efi_guid_t *guid,
1405 efi_uintn_t data_size, u8 *data)
1406{
1407 u32 event_size;
1408 efi_status_t ret;
1409 struct efi_tcg2_uefi_variable_data *event;
1410
1411 event_size = sizeof(event->variable_name) +
1412 sizeof(event->unicode_name_length) +
1413 sizeof(event->variable_data_length) +
1414 (u16_strlen(var_name) * sizeof(u16)) + data_size;
1415 event = malloc(event_size);
1416 if (!event)
1417 return EFI_OUT_OF_RESOURCES;
1418
1419 guidcpy(&event->variable_name, guid);
1420 event->unicode_name_length = u16_strlen(var_name);
1421 event->variable_data_length = data_size;
1422 memcpy(event->unicode_name, var_name,
1423 (event->unicode_name_length * sizeof(u16)));
1424 if (data) {
1425 memcpy((u16 *)event->unicode_name + event->unicode_name_length,
1426 data, data_size);
1427 }
1428 ret = tcg2_measure_event(dev, pcr_index, event_type, event_size,
1429 (u8 *)event);
1430 free(event);
1431 return ret;
1432}
1433
1434/**
Masahisa Kojima8173cd42021-08-13 16:12:40 +09001435 * tcg2_measure_boot_variable() - measure boot variables
1436 *
1437 * @dev: TPM device
1438 *
1439 * Return: status code
1440 */
1441static efi_status_t tcg2_measure_boot_variable(struct udevice *dev)
1442{
1443 u16 *boot_order;
1444 u16 *boot_index;
1445 u16 var_name[] = L"BootOrder";
1446 u16 boot_name[] = L"Boot####";
1447 u8 *bootvar;
1448 efi_uintn_t var_data_size;
1449 u32 count, i;
1450 efi_status_t ret;
1451
1452 boot_order = efi_get_var(var_name, &efi_global_variable_guid,
1453 &var_data_size);
1454 if (!boot_order) {
Masahisa Kojimad1325932021-11-09 18:44:54 +09001455 /* If "BootOrder" is not defined, skip the boot variable measurement */
1456 return EFI_SUCCESS;
Masahisa Kojima8173cd42021-08-13 16:12:40 +09001457 }
1458
1459 ret = tcg2_measure_variable(dev, 1, EV_EFI_VARIABLE_BOOT2, var_name,
1460 &efi_global_variable_guid, var_data_size,
1461 (u8 *)boot_order);
1462 if (ret != EFI_SUCCESS)
1463 goto error;
1464
1465 count = var_data_size / sizeof(*boot_order);
1466 boot_index = boot_order;
1467 for (i = 0; i < count; i++) {
1468 efi_create_indexed_name(boot_name, sizeof(boot_name),
1469 "Boot", *boot_index++);
1470
1471 bootvar = efi_get_var(boot_name, &efi_global_variable_guid,
1472 &var_data_size);
1473
1474 if (!bootvar) {
1475 log_info("%ls not found\n", boot_name);
1476 continue;
1477 }
1478
1479 ret = tcg2_measure_variable(dev, 1, EV_EFI_VARIABLE_BOOT2,
1480 boot_name,
1481 &efi_global_variable_guid,
1482 var_data_size, bootvar);
1483 free(bootvar);
1484 if (ret != EFI_SUCCESS)
1485 goto error;
1486 }
1487
1488error:
1489 free(boot_order);
1490 return ret;
1491}
1492
1493/**
Masahisa Kojimacd1fe7d2021-10-26 17:27:24 +09001494 * tcg2_measure_smbios() - measure smbios table
1495 *
1496 * @dev: TPM device
1497 * @entry: pointer to the smbios_entry structure
1498 *
1499 * Return: status code
1500 */
1501static efi_status_t
1502tcg2_measure_smbios(struct udevice *dev,
1503 const struct smbios_entry *entry)
1504{
1505 efi_status_t ret;
1506 struct smbios_header *smbios_copy;
1507 struct smbios_handoff_table_pointers2 *event = NULL;
1508 u32 event_size;
1509
1510 /*
1511 * TCG PC Client PFP Spec says
1512 * "SMBIOS structures that contain static configuration information
1513 * (e.g. Platform Manufacturer Enterprise Number assigned by IANA,
1514 * platform model number, Vendor and Device IDs for each SMBIOS table)
1515 * that is relevant to the security of the platform MUST be measured".
1516 * Device dependent parameters such as serial number are cleared to
1517 * zero or spaces for the measurement.
1518 */
1519 event_size = sizeof(struct smbios_handoff_table_pointers2) +
1520 FIELD_SIZEOF(struct efi_configuration_table, guid) +
1521 entry->struct_table_length;
1522 event = calloc(1, event_size);
1523 if (!event) {
1524 ret = EFI_OUT_OF_RESOURCES;
1525 goto out;
1526 }
1527
1528 event->table_description_size = sizeof(SMBIOS_HANDOFF_TABLE_DESC);
1529 memcpy(event->table_description, SMBIOS_HANDOFF_TABLE_DESC,
1530 sizeof(SMBIOS_HANDOFF_TABLE_DESC));
1531 put_unaligned_le64(1, &event->number_of_tables);
1532 guidcpy(&event->table_entry[0].guid, &smbios_guid);
1533 smbios_copy = (struct smbios_header *)((uintptr_t)&event->table_entry[0].table);
1534 memcpy(&event->table_entry[0].table,
1535 (void *)((uintptr_t)entry->struct_table_address),
1536 entry->struct_table_length);
1537
1538 smbios_prepare_measurement(entry, smbios_copy);
1539
1540 ret = tcg2_measure_event(dev, 1, EV_EFI_HANDOFF_TABLES2, event_size,
1541 (u8 *)event);
1542 if (ret != EFI_SUCCESS)
1543 goto out;
1544
1545out:
1546 free(event);
1547
1548 return ret;
1549}
1550
1551/**
1552 * find_smbios_table() - find smbios table
1553 *
1554 * Return: pointer to the smbios table
1555 */
1556static void *find_smbios_table(void)
1557{
1558 u32 i;
1559
1560 for (i = 0; i < systab.nr_tables; i++) {
1561 if (!guidcmp(&smbios_guid, &systab.tables[i].guid))
1562 return systab.tables[i].table;
1563 }
1564
1565 return NULL;
1566}
1567
1568/**
Masahisa Kojima6460c3e2021-10-26 17:27:25 +09001569 * tcg2_measure_gpt_table() - measure gpt table
1570 *
1571 * @dev: TPM device
1572 * @loaded_image: handle to the loaded image
1573 *
1574 * Return: status code
1575 */
1576static efi_status_t
1577tcg2_measure_gpt_data(struct udevice *dev,
1578 struct efi_loaded_image_obj *loaded_image)
1579{
1580 efi_status_t ret;
1581 efi_handle_t handle;
1582 struct efi_handler *dp_handler;
1583 struct efi_device_path *orig_device_path;
1584 struct efi_device_path *device_path;
1585 struct efi_device_path *dp;
1586 struct efi_block_io *block_io;
1587 struct efi_gpt_data *event = NULL;
1588 efi_guid_t null_guid = NULL_GUID;
1589 gpt_header *gpt_h;
1590 gpt_entry *entry = NULL;
1591 gpt_entry *gpt_e;
1592 u32 num_of_valid_entry = 0;
1593 u32 event_size;
1594 u32 i;
1595 u32 total_gpt_entry_size;
1596
1597 ret = efi_search_protocol(&loaded_image->header,
1598 &efi_guid_loaded_image_device_path,
1599 &dp_handler);
1600 if (ret != EFI_SUCCESS)
1601 return ret;
1602
1603 orig_device_path = dp_handler->protocol_interface;
1604 if (!orig_device_path) /* no device path, skip GPT measurement */
1605 return EFI_SUCCESS;
1606
1607 device_path = efi_dp_dup(orig_device_path);
1608 if (!device_path)
1609 return EFI_OUT_OF_RESOURCES;
1610
1611 dp = search_gpt_dp_node(device_path);
1612 if (!dp) {
1613 /* no GPT device path node found, skip GPT measurement */
1614 ret = EFI_SUCCESS;
1615 goto out1;
1616 }
1617
1618 /* read GPT header */
1619 dp->type = DEVICE_PATH_TYPE_END;
1620 dp->sub_type = DEVICE_PATH_SUB_TYPE_END;
1621 dp = device_path;
1622 ret = EFI_CALL(systab.boottime->locate_device_path(&efi_block_io_guid,
1623 &dp, &handle));
1624 if (ret != EFI_SUCCESS)
1625 goto out1;
1626
1627 ret = EFI_CALL(efi_handle_protocol(handle,
1628 &efi_block_io_guid, (void **)&block_io));
1629 if (ret != EFI_SUCCESS)
1630 goto out1;
1631
1632 gpt_h = memalign(block_io->media->io_align, block_io->media->block_size);
1633 if (!gpt_h) {
1634 ret = EFI_OUT_OF_RESOURCES;
1635 goto out2;
1636 }
1637
1638 ret = block_io->read_blocks(block_io, block_io->media->media_id, 1,
1639 block_io->media->block_size, gpt_h);
1640 if (ret != EFI_SUCCESS)
1641 goto out2;
1642
1643 /* read GPT entry */
1644 total_gpt_entry_size = gpt_h->num_partition_entries *
1645 gpt_h->sizeof_partition_entry;
1646 entry = memalign(block_io->media->io_align, total_gpt_entry_size);
1647 if (!entry) {
1648 ret = EFI_OUT_OF_RESOURCES;
1649 goto out2;
1650 }
1651
1652 ret = block_io->read_blocks(block_io, block_io->media->media_id,
1653 gpt_h->partition_entry_lba,
1654 total_gpt_entry_size, entry);
1655 if (ret != EFI_SUCCESS)
1656 goto out2;
1657
1658 /* count valid GPT entry */
1659 gpt_e = entry;
1660 for (i = 0; i < gpt_h->num_partition_entries; i++) {
1661 if (guidcmp(&null_guid, &gpt_e->partition_type_guid))
1662 num_of_valid_entry++;
1663
1664 gpt_e = (gpt_entry *)((u8 *)gpt_e + gpt_h->sizeof_partition_entry);
1665 }
1666
1667 /* prepare event data for measurement */
1668 event_size = sizeof(struct efi_gpt_data) +
1669 (num_of_valid_entry * gpt_h->sizeof_partition_entry);
1670 event = calloc(1, event_size);
1671 if (!event) {
1672 ret = EFI_OUT_OF_RESOURCES;
1673 goto out2;
1674 }
1675 memcpy(event, gpt_h, sizeof(gpt_header));
1676 put_unaligned_le64(num_of_valid_entry, &event->number_of_partitions);
1677
1678 /* copy valid GPT entry */
1679 gpt_e = entry;
1680 num_of_valid_entry = 0;
1681 for (i = 0; i < gpt_h->num_partition_entries; i++) {
1682 if (guidcmp(&null_guid, &gpt_e->partition_type_guid)) {
1683 memcpy((u8 *)event->partitions +
1684 (num_of_valid_entry * gpt_h->sizeof_partition_entry),
1685 gpt_e, gpt_h->sizeof_partition_entry);
1686 num_of_valid_entry++;
1687 }
1688
1689 gpt_e = (gpt_entry *)((u8 *)gpt_e + gpt_h->sizeof_partition_entry);
1690 }
1691
1692 ret = tcg2_measure_event(dev, 5, EV_EFI_GPT_EVENT, event_size, (u8 *)event);
1693 if (ret != EFI_SUCCESS)
1694 goto out2;
1695
1696out2:
1697 EFI_CALL(efi_close_protocol((efi_handle_t)block_io, &efi_block_io_guid,
1698 NULL, NULL));
1699 free(gpt_h);
1700 free(entry);
1701 free(event);
1702out1:
1703 efi_free_pool(device_path);
1704
1705 return ret;
1706}
1707
1708/**
Masahisa Kojima8173cd42021-08-13 16:12:40 +09001709 * efi_tcg2_measure_efi_app_invocation() - measure efi app invocation
1710 *
1711 * Return: status code
1712 */
Masahisa Kojima6460c3e2021-10-26 17:27:25 +09001713efi_status_t efi_tcg2_measure_efi_app_invocation(struct efi_loaded_image_obj *handle)
Masahisa Kojima8173cd42021-08-13 16:12:40 +09001714{
1715 efi_status_t ret;
1716 u32 pcr_index;
1717 struct udevice *dev;
1718 u32 event = 0;
Masahisa Kojimacd1fe7d2021-10-26 17:27:24 +09001719 struct smbios_entry *entry;
Masahisa Kojima8173cd42021-08-13 16:12:40 +09001720
1721 if (tcg2_efi_app_invoked)
1722 return EFI_SUCCESS;
1723
1724 ret = platform_get_tpm2_device(&dev);
1725 if (ret != EFI_SUCCESS)
1726 return ret;
1727
1728 ret = tcg2_measure_boot_variable(dev);
1729 if (ret != EFI_SUCCESS)
1730 goto out;
1731
1732 ret = tcg2_measure_event(dev, 4, EV_EFI_ACTION,
1733 strlen(EFI_CALLING_EFI_APPLICATION),
1734 (u8 *)EFI_CALLING_EFI_APPLICATION);
1735 if (ret != EFI_SUCCESS)
1736 goto out;
1737
Masahisa Kojimacd1fe7d2021-10-26 17:27:24 +09001738 entry = (struct smbios_entry *)find_smbios_table();
1739 if (entry) {
1740 ret = tcg2_measure_smbios(dev, entry);
1741 if (ret != EFI_SUCCESS)
1742 goto out;
1743 }
1744
Masahisa Kojima6460c3e2021-10-26 17:27:25 +09001745 ret = tcg2_measure_gpt_data(dev, handle);
1746 if (ret != EFI_SUCCESS)
1747 goto out;
1748
Masahisa Kojima8173cd42021-08-13 16:12:40 +09001749 for (pcr_index = 0; pcr_index <= 7; pcr_index++) {
1750 ret = tcg2_measure_event(dev, pcr_index, EV_SEPARATOR,
1751 sizeof(event), (u8 *)&event);
1752 if (ret != EFI_SUCCESS)
1753 goto out;
1754 }
1755
1756 tcg2_efi_app_invoked = true;
1757out:
1758 return ret;
1759}
1760
1761/**
1762 * efi_tcg2_measure_efi_app_exit() - measure efi app exit
1763 *
1764 * Return: status code
1765 */
1766efi_status_t efi_tcg2_measure_efi_app_exit(void)
1767{
1768 efi_status_t ret;
1769 struct udevice *dev;
1770
1771 ret = platform_get_tpm2_device(&dev);
1772 if (ret != EFI_SUCCESS)
1773 return ret;
1774
1775 ret = tcg2_measure_event(dev, 4, EV_EFI_ACTION,
1776 strlen(EFI_RETURNING_FROM_EFI_APPLICATION),
1777 (u8 *)EFI_RETURNING_FROM_EFI_APPLICATION);
1778 return ret;
1779}
1780
1781/**
Masahisa Kojima1ac19bb2021-08-13 16:12:41 +09001782 * efi_tcg2_notify_exit_boot_services() - ExitBootService callback
1783 *
1784 * @event: callback event
1785 * @context: callback context
1786 */
1787static void EFIAPI
1788efi_tcg2_notify_exit_boot_services(struct efi_event *event, void *context)
1789{
1790 efi_status_t ret;
1791 struct udevice *dev;
1792
1793 EFI_ENTRY("%p, %p", event, context);
1794
1795 ret = platform_get_tpm2_device(&dev);
1796 if (ret != EFI_SUCCESS)
1797 goto out;
1798
1799 ret = tcg2_measure_event(dev, 5, EV_EFI_ACTION,
1800 strlen(EFI_EXIT_BOOT_SERVICES_INVOCATION),
1801 (u8 *)EFI_EXIT_BOOT_SERVICES_INVOCATION);
1802 if (ret != EFI_SUCCESS)
1803 goto out;
1804
1805 ret = tcg2_measure_event(dev, 5, EV_EFI_ACTION,
1806 strlen(EFI_EXIT_BOOT_SERVICES_SUCCEEDED),
1807 (u8 *)EFI_EXIT_BOOT_SERVICES_SUCCEEDED);
1808
1809out:
1810 EFI_EXIT(ret);
1811}
1812
1813/**
1814 * efi_tcg2_notify_exit_boot_services_failed()
1815 * - notify ExitBootServices() is failed
1816 *
1817 * Return: status code
1818 */
1819efi_status_t efi_tcg2_notify_exit_boot_services_failed(void)
1820{
1821 struct udevice *dev;
1822 efi_status_t ret;
1823
1824 ret = platform_get_tpm2_device(&dev);
1825 if (ret != EFI_SUCCESS)
1826 goto out;
1827
1828 ret = tcg2_measure_event(dev, 5, EV_EFI_ACTION,
1829 strlen(EFI_EXIT_BOOT_SERVICES_INVOCATION),
1830 (u8 *)EFI_EXIT_BOOT_SERVICES_INVOCATION);
1831 if (ret != EFI_SUCCESS)
1832 goto out;
1833
1834 ret = tcg2_measure_event(dev, 5, EV_EFI_ACTION,
1835 strlen(EFI_EXIT_BOOT_SERVICES_FAILED),
1836 (u8 *)EFI_EXIT_BOOT_SERVICES_FAILED);
1837
1838out:
1839 return ret;
1840}
1841
1842/**
Masahisa Kojima1d2a6562021-08-13 16:12:39 +09001843 * tcg2_measure_secure_boot_variable() - measure secure boot variables
1844 *
1845 * @dev: TPM device
1846 *
1847 * Return: status code
1848 */
1849static efi_status_t tcg2_measure_secure_boot_variable(struct udevice *dev)
1850{
1851 u8 *data;
1852 efi_uintn_t data_size;
1853 u32 count, i;
1854 efi_status_t ret;
Masahisa Kojimaf3e0c552021-10-26 17:27:27 +09001855 u8 deployed_mode;
1856 efi_uintn_t size;
1857 u32 deployed_audit_pcr_index = 1;
1858
1859 size = sizeof(deployed_mode);
1860 ret = efi_get_variable_int(u"DeployedMode", &efi_global_variable_guid,
1861 NULL, &size, &deployed_mode, NULL);
1862 if (ret != EFI_SUCCESS || !deployed_mode)
1863 deployed_audit_pcr_index = 7;
Masahisa Kojima1d2a6562021-08-13 16:12:39 +09001864
1865 count = ARRAY_SIZE(secure_variables);
1866 for (i = 0; i < count; i++) {
Heinrich Schuchardt6f26e7c2021-09-09 08:50:01 +02001867 const efi_guid_t *guid;
1868
Masahisa Kojima21684522021-10-26 17:27:26 +09001869 guid = efi_auth_var_get_guid(secure_variables[i].name);
Heinrich Schuchardt6f26e7c2021-09-09 08:50:01 +02001870
Masahisa Kojima21684522021-10-26 17:27:26 +09001871 data = efi_get_var(secure_variables[i].name, guid, &data_size);
1872 if (!data && !secure_variables[i].accept_empty)
1873 continue;
Masahisa Kojima1d2a6562021-08-13 16:12:39 +09001874
Masahisa Kojimaf3e0c552021-10-26 17:27:27 +09001875 if (u16_strcmp(u"DeployedMode", secure_variables[i].name))
1876 secure_variables[i].pcr_index = deployed_audit_pcr_index;
1877 if (u16_strcmp(u"AuditMode", secure_variables[i].name))
1878 secure_variables[i].pcr_index = deployed_audit_pcr_index;
1879
1880 ret = tcg2_measure_variable(dev, secure_variables[i].pcr_index,
Masahisa Kojima1d2a6562021-08-13 16:12:39 +09001881 EV_EFI_VARIABLE_DRIVER_CONFIG,
Masahisa Kojima21684522021-10-26 17:27:26 +09001882 secure_variables[i].name, guid,
Masahisa Kojima1d2a6562021-08-13 16:12:39 +09001883 data_size, data);
1884 free(data);
1885 if (ret != EFI_SUCCESS)
1886 goto error;
1887 }
1888
Masahisa Kojima1d2a6562021-08-13 16:12:39 +09001889error:
1890 return ret;
1891}
1892
1893/**
Ilias Apalodimas590fef62020-11-11 11:18:11 +02001894 * efi_tcg2_register() - register EFI_TCG2_PROTOCOL
1895 *
1896 * If a TPM2 device is available, the TPM TCG2 Protocol is registered
1897 *
1898 * Return: An error status is only returned if adding the protocol fails.
1899 */
1900efi_status_t efi_tcg2_register(void)
1901{
Ilias Apalodimas1b278e62021-03-25 13:31:45 +02001902 efi_status_t ret = EFI_SUCCESS;
Ilias Apalodimas590fef62020-11-11 11:18:11 +02001903 struct udevice *dev;
Masahisa Kojima1ac19bb2021-08-13 16:12:41 +09001904 struct efi_event *event;
Ilias Apalodimas590fef62020-11-11 11:18:11 +02001905
1906 ret = platform_get_tpm2_device(&dev);
Ilias Apalodimasc67fef62020-11-16 08:52:41 +02001907 if (ret != EFI_SUCCESS) {
1908 log_warning("Unable to find TPMv2 device\n");
Ilias Apalodimasfa5217d2021-05-10 21:19:14 +03001909 return EFI_SUCCESS;
Ilias Apalodimas590fef62020-11-11 11:18:11 +02001910 }
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001911
1912 ret = efi_init_event_log();
1913 if (ret != EFI_SUCCESS)
Ilias Apalodimas1b278e62021-03-25 13:31:45 +02001914 goto fail;
Ilias Apalodimas967650d2020-11-30 11:47:40 +02001915
Ilias Apalodimasf576f7d2021-03-24 16:50:46 +02001916 ret = efi_append_scrtm_version(dev);
Ilias Apalodimas5a2baf92021-05-12 00:03:41 +03001917 if (ret != EFI_SUCCESS) {
1918 tcg2_uninit();
Ilias Apalodimasfa5217d2021-05-10 21:19:14 +03001919 goto fail;
Ilias Apalodimas5a2baf92021-05-12 00:03:41 +03001920 }
Ilias Apalodimasf576f7d2021-03-24 16:50:46 +02001921
Ilias Apalodimas590fef62020-11-11 11:18:11 +02001922 ret = efi_add_protocol(efi_root, &efi_guid_tcg2_protocol,
1923 (void *)&efi_tcg2_protocol);
Ilias Apalodimas1b278e62021-03-25 13:31:45 +02001924 if (ret != EFI_SUCCESS) {
Ilias Apalodimas5a2baf92021-05-12 00:03:41 +03001925 tcg2_uninit();
Ilias Apalodimas1b278e62021-03-25 13:31:45 +02001926 goto fail;
1927 }
Masahisa Kojima1d2a6562021-08-13 16:12:39 +09001928
Masahisa Kojima1ac19bb2021-08-13 16:12:41 +09001929 ret = efi_create_event(EVT_SIGNAL_EXIT_BOOT_SERVICES, TPL_CALLBACK,
1930 efi_tcg2_notify_exit_boot_services, NULL,
1931 NULL, &event);
1932 if (ret != EFI_SUCCESS) {
1933 tcg2_uninit();
1934 goto fail;
1935 }
1936
Masahisa Kojima1d2a6562021-08-13 16:12:39 +09001937 ret = tcg2_measure_secure_boot_variable(dev);
1938 if (ret != EFI_SUCCESS) {
1939 tcg2_uninit();
1940 goto fail;
1941 }
1942
Ilias Apalodimas1b278e62021-03-25 13:31:45 +02001943 return ret;
Ilias Apalodimasfa5217d2021-05-10 21:19:14 +03001944
Ilias Apalodimas1b278e62021-03-25 13:31:45 +02001945fail:
Ilias Apalodimas5a2baf92021-05-12 00:03:41 +03001946 log_err("Cannot install EFI_TCG2_PROTOCOL\n");
1947 /*
1948 * Return EFI_SUCCESS and don't stop the EFI subsystem.
1949 * That's done for 2 reasons
1950 * - If the protocol is not installed the PCRs won't be extended. So
1951 * someone later in the boot flow will notice that and take the
1952 * necessary actions.
1953 * - The TPM sandbox is limited and we won't be able to run any efi
1954 * related tests with TCG2 enabled
1955 */
1956 return EFI_SUCCESS;
Ilias Apalodimas590fef62020-11-11 11:18:11 +02001957}