// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (c) 2023 Linaro Limited * Copyright (c) 2018 Bootlin * Author: Miquel Raynal */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "tpm-utils.h" int tcg2_get_active_pcr_banks(struct udevice *dev, u32 *active_pcr_banks) { u32 supported = 0; u32 pcr_banks = 0; u32 active = 0; int rc; rc = tpm2_get_pcr_info(dev, &supported, &active, &pcr_banks); if (rc) return rc; *active_pcr_banks = active; return 0; } u32 tcg2_event_get_size(struct tpml_digest_values *digest_list) { u32 len; size_t i; len = offsetof(struct tcg_pcr_event2, digests); len += offsetof(struct tpml_digest_values, digests); for (i = 0; i < digest_list->count; ++i) { u16 l = tpm2_algorithm_to_len(digest_list->digests[i].hash_alg); if (!l) continue; len += l + offsetof(struct tpmt_ha, digest); } len += sizeof(u32); return len; } int tcg2_create_digest(struct udevice *dev, const u8 *input, u32 length, struct tpml_digest_values *digest_list) { u8 final[sizeof(union tpmu_ha)]; sha256_context ctx_256; sha512_context ctx_512; sha1_context ctx; u32 active; size_t i; u32 len; int rc; rc = tcg2_get_active_pcr_banks(dev, &active); if (rc) return rc; digest_list->count = 0; for (i = 0; i < ARRAY_SIZE(hash_algo_list); ++i) { if (!(active & hash_algo_list[i].hash_mask)) continue; switch (hash_algo_list[i].hash_alg) { case TPM2_ALG_SHA1: sha1_starts(&ctx); sha1_update(&ctx, input, length); sha1_finish(&ctx, final); len = TPM2_SHA1_DIGEST_SIZE; break; case TPM2_ALG_SHA256: sha256_starts(&ctx_256); sha256_update(&ctx_256, input, length); sha256_finish(&ctx_256, final); len = TPM2_SHA256_DIGEST_SIZE; break; case TPM2_ALG_SHA384: sha384_starts(&ctx_512); sha384_update(&ctx_512, input, length); sha384_finish(&ctx_512, final); len = TPM2_SHA384_DIGEST_SIZE; break; case TPM2_ALG_SHA512: sha512_starts(&ctx_512); sha512_update(&ctx_512, input, length); sha512_finish(&ctx_512, final); len = TPM2_SHA512_DIGEST_SIZE; break; default: printf("%s: unsupported algorithm %x\n", __func__, hash_algo_list[i].hash_alg); continue; } digest_list->digests[digest_list->count].hash_alg = hash_algo_list[i].hash_alg; memcpy(&digest_list->digests[digest_list->count].digest, final, len); digest_list->count++; } return 0; } void tcg2_log_append(u32 pcr_index, u32 event_type, struct tpml_digest_values *digest_list, u32 size, const u8 *event, u8 *log) { size_t len; size_t pos; u32 i; pos = offsetof(struct tcg_pcr_event2, pcr_index); put_unaligned_le32(pcr_index, log); pos = offsetof(struct tcg_pcr_event2, event_type); put_unaligned_le32(event_type, log + pos); pos = offsetof(struct tcg_pcr_event2, digests) + offsetof(struct tpml_digest_values, count); put_unaligned_le32(digest_list->count, log + pos); pos = offsetof(struct tcg_pcr_event2, digests) + offsetof(struct tpml_digest_values, digests); for (i = 0; i < digest_list->count; ++i) { u16 hash_alg = digest_list->digests[i].hash_alg; len = tpm2_algorithm_to_len(hash_alg); if (!len) continue; pos += offsetof(struct tpmt_ha, hash_alg); put_unaligned_le16(hash_alg, log + pos); pos += offsetof(struct tpmt_ha, digest); memcpy(log + pos, (u8 *)&digest_list->digests[i].digest, len); pos += len; } put_unaligned_le32(size, log + pos); pos += sizeof(u32); memcpy(log + pos, event, size); } static int tcg2_log_append_check(struct tcg2_event_log *elog, u32 pcr_index, u32 event_type, struct tpml_digest_values *digest_list, u32 size, const u8 *event) { u32 event_size; u8 *log; event_size = size + tcg2_event_get_size(digest_list); if (elog->log_position + event_size > elog->log_size) { printf("%s: log too large: %u + %u > %u\n", __func__, elog->log_position, event_size, elog->log_size); return -ENOBUFS; } log = elog->log + elog->log_position; elog->log_position += event_size; tcg2_log_append(pcr_index, event_type, digest_list, size, event, log); return 0; } static int tcg2_log_init(struct udevice *dev, struct tcg2_event_log *elog) { struct tcg_efi_spec_id_event *ev; struct tcg_pcr_event *log; u32 event_size; u32 count = 0; u32 log_size; u32 active; size_t i; u16 len; int rc; rc = tcg2_get_active_pcr_banks(dev, &active); if (rc) return rc; event_size = offsetof(struct tcg_efi_spec_id_event, digest_sizes); for (i = 0; i < ARRAY_SIZE(hash_algo_list); ++i) { if (!(active & hash_algo_list[i].hash_mask)) continue; switch (hash_algo_list[i].hash_alg) { case TPM2_ALG_SHA1: case TPM2_ALG_SHA256: case TPM2_ALG_SHA384: case TPM2_ALG_SHA512: count++; break; default: continue; } } event_size += 1 + (sizeof(struct tcg_efi_spec_id_event_algorithm_size) * count); log_size = offsetof(struct tcg_pcr_event, event) + event_size; if (log_size > elog->log_size) { printf("%s: log too large: %u > %u\n", __func__, log_size, elog->log_size); return -ENOBUFS; } log = (struct tcg_pcr_event *)elog->log; put_unaligned_le32(0, &log->pcr_index); put_unaligned_le32(EV_NO_ACTION, &log->event_type); memset(&log->digest, 0, sizeof(log->digest)); put_unaligned_le32(event_size, &log->event_size); ev = (struct tcg_efi_spec_id_event *)log->event; strlcpy((char *)ev->signature, TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03, sizeof(ev->signature)); put_unaligned_le32(0, &ev->platform_class); ev->spec_version_minor = TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MINOR_TPM2; ev->spec_version_major = TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MAJOR_TPM2; ev->spec_errata = TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_ERRATA_TPM2; ev->uintn_size = sizeof(size_t) / sizeof(u32); put_unaligned_le32(count, &ev->number_of_algorithms); count = 0; for (i = 0; i < ARRAY_SIZE(hash_algo_list); ++i) { if (!(active & hash_algo_list[i].hash_mask)) continue; len = hash_algo_list[i].hash_len; if (!len) continue; put_unaligned_le16(hash_algo_list[i].hash_alg, &ev->digest_sizes[count].algorithm_id); put_unaligned_le16(len, &ev->digest_sizes[count].digest_size); count++; } *((u8 *)ev + (event_size - 1)) = 0; elog->log_position = log_size; return 0; } static int tcg2_replay_eventlog(struct tcg2_event_log *elog, struct udevice *dev, struct tpml_digest_values *digest_list, u32 log_position) { const u32 offset = offsetof(struct tcg_pcr_event2, digests) + offsetof(struct tpml_digest_values, digests); u32 event_size; u32 count; u16 algo; u32 pcr; u32 pos; u16 len; u8 *log; int rc; u32 i; while (log_position + offset < elog->log_size) { log = elog->log + log_position; pos = offsetof(struct tcg_pcr_event2, pcr_index); pcr = get_unaligned_le32(log + pos); pos = offsetof(struct tcg_pcr_event2, event_type); if (!get_unaligned_le32(log + pos)) return 0; pos = offsetof(struct tcg_pcr_event2, digests) + offsetof(struct tpml_digest_values, count); count = get_unaligned_le32(log + pos); if (count > ARRAY_SIZE(hash_algo_list) || (digest_list->count && digest_list->count != count)) return 0; pos = offsetof(struct tcg_pcr_event2, digests) + offsetof(struct tpml_digest_values, digests); for (i = 0; i < count; ++i) { pos += offsetof(struct tpmt_ha, hash_alg); if (log_position + pos + sizeof(u16) >= elog->log_size) return 0; algo = get_unaligned_le16(log + pos); pos += offsetof(struct tpmt_ha, digest); switch (algo) { case TPM2_ALG_SHA1: case TPM2_ALG_SHA256: case TPM2_ALG_SHA384: case TPM2_ALG_SHA512: len = tpm2_algorithm_to_len(algo); break; default: return 0; } if (digest_list->count) { if (algo != digest_list->digests[i].hash_alg || log_position + pos + len >= elog->log_size) return 0; memcpy(digest_list->digests[i].digest.sha512, log + pos, len); } pos += len; } if (log_position + pos + sizeof(u32) >= elog->log_size) return 0; event_size = get_unaligned_le32(log + pos); pos += event_size + sizeof(u32); if (log_position + pos > elog->log_size) return 0; if (digest_list->count) { rc = tcg2_pcr_extend(dev, pcr, digest_list); if (rc) return rc; } log_position += pos; } elog->log_position = log_position; elog->found = true; return 0; } static int tcg2_log_parse(struct udevice *dev, struct tcg2_event_log *elog) { struct tpml_digest_values digest_list; struct tcg_efi_spec_id_event *event; struct tcg_pcr_event *log; u32 log_active; u32 calc_size; u32 active; u32 count; u32 evsz; u32 mask; u16 algo; u16 len; int rc; u32 i; u16 j; if (elog->log_size <= offsetof(struct tcg_pcr_event, event)) return 0; log = (struct tcg_pcr_event *)elog->log; if (get_unaligned_le32(&log->pcr_index) != 0 || get_unaligned_le32(&log->event_type) != EV_NO_ACTION) return 0; for (i = 0; i < sizeof(log->digest); i++) { if (log->digest[i]) return 0; } evsz = get_unaligned_le32(&log->event_size); if (evsz < offsetof(struct tcg_efi_spec_id_event, digest_sizes) || evsz + offsetof(struct tcg_pcr_event, event) > elog->log_size) return 0; event = (struct tcg_efi_spec_id_event *)log->event; if (memcmp(event->signature, TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03, sizeof(TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03))) return 0; if (event->spec_version_minor != TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MINOR_TPM2 || event->spec_version_major != TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MAJOR_TPM2) return 0; count = get_unaligned_le32(&event->number_of_algorithms); if (count > ARRAY_SIZE(hash_algo_list)) return 0; calc_size = offsetof(struct tcg_efi_spec_id_event, digest_sizes) + (sizeof(struct tcg_efi_spec_id_event_algorithm_size) * count) + 1; if (evsz != calc_size) return 0; rc = tcg2_get_active_pcr_banks(dev, &active); if (rc) return rc; digest_list.count = 0; log_active = 0; for (i = 0; i < count; ++i) { algo = get_unaligned_le16(&event->digest_sizes[i].algorithm_id); mask = tpm2_algorithm_to_mask(algo); if (!(active & mask)) return 0; switch (algo) { case TPM2_ALG_SHA1: case TPM2_ALG_SHA256: case TPM2_ALG_SHA384: case TPM2_ALG_SHA512: len = get_unaligned_le16(&event->digest_sizes[i].digest_size); if (tpm2_algorithm_to_len(algo) != len) return 0; digest_list.digests[digest_list.count++].hash_alg = algo; break; default: return 0; } log_active |= mask; } /* Ensure the previous firmware extended all the PCRs. */ if (log_active != active) return 0; /* Read PCR0 to check if previous firmware extended the PCRs or not. */ rc = tcg2_pcr_read(dev, 0, &digest_list); if (rc) return rc; for (i = 0; i < digest_list.count; ++i) { len = tpm2_algorithm_to_len(digest_list.digests[i].hash_alg); for (j = 0; j < len; ++j) { if (digest_list.digests[i].digest.sha512[j]) break; } /* PCR is non-zero; it has been extended, so skip extending. */ if (j != len) { digest_list.count = 0; break; } } return tcg2_replay_eventlog(elog, dev, &digest_list, offsetof(struct tcg_pcr_event, event) + evsz); } int tcg2_pcr_extend(struct udevice *dev, u32 pcr_index, struct tpml_digest_values *digest_list) { u32 rc; u32 i; for (i = 0; i < digest_list->count; i++) { u32 alg = digest_list->digests[i].hash_alg; rc = tpm2_pcr_extend(dev, pcr_index, alg, (u8 *)&digest_list->digests[i].digest, tpm2_algorithm_to_len(alg)); if (rc) { printf("%s: error pcr:%u alg:%08x\n", __func__, pcr_index, alg); return rc; } } return 0; } int tcg2_pcr_read(struct udevice *dev, u32 pcr_index, struct tpml_digest_values *digest_list) { struct tpm_chip_priv *priv; u32 rc; u32 i; priv = dev_get_uclass_priv(dev); if (!priv) return -ENODEV; for (i = 0; i < digest_list->count; i++) { u32 alg = digest_list->digests[i].hash_alg; u8 *digest = (u8 *)&digest_list->digests[i].digest; rc = tpm2_pcr_read(dev, pcr_index, priv->pcr_select_min, alg, digest, tpm2_algorithm_to_len(alg), NULL); if (rc) { printf("%s: error pcr:%u alg:%08x\n", __func__, pcr_index, alg); return rc; } } return 0; } int tcg2_measure_data(struct udevice *dev, struct tcg2_event_log *elog, u32 pcr_index, u32 size, const u8 *data, u32 event_type, u32 event_size, const u8 *event) { struct tpml_digest_values digest_list; int rc; if (data) rc = tcg2_create_digest(dev, data, size, &digest_list); else rc = tcg2_create_digest(dev, event, event_size, &digest_list); if (rc) return rc; rc = tcg2_pcr_extend(dev, pcr_index, &digest_list); if (rc) return rc; return tcg2_log_append_check(elog, pcr_index, event_type, &digest_list, event_size, event); } int tcg2_log_prepare_buffer(struct udevice *dev, struct tcg2_event_log *elog, bool ignore_existing_log) { struct tcg2_event_log log; int rc; elog->log_position = 0; elog->found = false; rc = tcg2_platform_get_log(dev, (void **)&log.log, &log.log_size); if (!rc) { log.log_position = 0; log.found = false; if (!ignore_existing_log) { rc = tcg2_log_parse(dev, &log); if (rc) return rc; } if (elog->log_size) { if (log.found) { if (elog->log_size < log.log_position) return -ENOSPC; /* * Copy the discovered log into the user buffer * if there's enough space. */ memcpy(elog->log, log.log, log.log_position); } unmap_physmem(log.log, MAP_NOCACHE); } else { elog->log = log.log; elog->log_size = log.log_size; } elog->log_position = log.log_position; elog->found = log.found; } /* * Initialize the log buffer if no log was discovered and the buffer is * valid. User's can pass in their own buffer as a fallback if no * memory region is found. */ if (!elog->found && elog->log_size) rc = tcg2_log_init(dev, elog); return rc; } int tcg2_measurement_init(struct udevice **dev, struct tcg2_event_log *elog, bool ignore_existing_log) { int rc; rc = tcg2_platform_get_tpm2(dev); if (rc) return rc; rc = tpm_auto_start(*dev); if (rc) return rc; rc = tcg2_log_prepare_buffer(*dev, elog, ignore_existing_log); if (rc) { tcg2_measurement_term(*dev, elog, true); return rc; } rc = tcg2_measure_event(*dev, elog, 0, EV_S_CRTM_VERSION, strlen(version_string) + 1, (u8 *)version_string); if (rc) { tcg2_measurement_term(*dev, elog, true); return rc; } return 0; } void tcg2_measurement_term(struct udevice *dev, struct tcg2_event_log *elog, bool error) { u32 event = error ? 0x1 : 0xffffffff; int i; for (i = 0; i < 8; ++i) tcg2_measure_event(dev, elog, i, EV_SEPARATOR, sizeof(event), (const u8 *)&event); if (elog->log) unmap_physmem(elog->log, MAP_NOCACHE); } __weak int tcg2_platform_get_log(struct udevice *dev, void **addr, u32 *size) { const __be32 *addr_prop; const __be32 *size_prop; int asize; int ssize; *addr = NULL; *size = 0; addr_prop = dev_read_prop(dev, "tpm_event_log_addr", &asize); if (!addr_prop) addr_prop = dev_read_prop(dev, "linux,sml-base", &asize); size_prop = dev_read_prop(dev, "tpm_event_log_size", &ssize); if (!size_prop) size_prop = dev_read_prop(dev, "linux,sml-size", &ssize); if (addr_prop && size_prop) { u64 a = of_read_number(addr_prop, asize / sizeof(__be32)); u64 s = of_read_number(size_prop, ssize / sizeof(__be32)); *addr = map_physmem(a, s, MAP_NOCACHE); *size = (u32)s; } else { struct ofnode_phandle_args args; phys_addr_t a; fdt_size_t s; if (dev_read_phandle_with_args(dev, "memory-region", NULL, 0, 0, &args)) return -ENODEV; a = ofnode_get_addr_size(args.node, "reg", &s); if (a == FDT_ADDR_T_NONE) return -ENOMEM; *addr = map_physmem(a, s, MAP_NOCACHE); *size = (u32)s; } return 0; } __weak int tcg2_platform_get_tpm2(struct udevice **dev) { for_each_tpm_device(*dev) { if (tpm_get_version(*dev) == TPM_V2) return 0; } return -ENODEV; } __weak void tcg2_platform_startup_error(struct udevice *dev, int rc) {} u32 tpm2_startup(struct udevice *dev, enum tpm2_startup_types mode) { const u8 command_v2[12] = { tpm_u16(TPM2_ST_NO_SESSIONS), tpm_u32(12), tpm_u32(TPM2_CC_STARTUP), tpm_u16(mode), }; int ret; /* * Note TPM2_Startup command will return RC_SUCCESS the first time, * but will return RC_INITIALIZE otherwise. */ ret = tpm_sendrecv_command(dev, command_v2, NULL, NULL); if (ret && ret != TPM2_RC_INITIALIZE) return ret; return 0; } u32 tpm2_self_test(struct udevice *dev, enum tpm2_yes_no full_test) { const u8 command_v2[12] = { tpm_u16(TPM2_ST_NO_SESSIONS), tpm_u32(11), tpm_u32(TPM2_CC_SELF_TEST), full_test, }; return tpm_sendrecv_command(dev, command_v2, NULL, NULL); } u32 tpm2_auto_start(struct udevice *dev) { u32 rc; rc = tpm2_self_test(dev, TPMI_YES); if (rc == TPM2_RC_INITIALIZE) { rc = tpm2_startup(dev, TPM2_SU_CLEAR); if (rc) return rc; rc = tpm2_self_test(dev, TPMI_YES); } return rc; } u32 tpm2_clear(struct udevice *dev, u32 handle, const char *pw, const ssize_t pw_sz) { /* Length of the message header, up to start of password */ uint offset = 27; u8 command_v2[COMMAND_BUFFER_SIZE] = { tpm_u16(TPM2_ST_SESSIONS), /* TAG */ tpm_u32(offset + pw_sz), /* Length */ tpm_u32(TPM2_CC_CLEAR), /* Command code */ /* HANDLE */ tpm_u32(handle), /* TPM resource handle */ /* AUTH_SESSION */ tpm_u32(9 + pw_sz), /* Authorization size */ tpm_u32(TPM2_RS_PW), /* Session handle */ tpm_u16(0), /* Size of */ /* (if any) */ 0, /* Attributes: Cont/Excl/Rst */ tpm_u16(pw_sz), /* Size of */ /* STRING(pw) (if any) */ }; int ret; /* * Fill the command structure starting from the first buffer: * - the password (if any) */ ret = pack_byte_string(command_v2, sizeof(command_v2), "s", offset, pw, pw_sz); offset += pw_sz; if (ret) return TPM_LIB_ERROR; return tpm_sendrecv_command(dev, command_v2, NULL, NULL); } u32 tpm2_nv_define_space(struct udevice *dev, u32 space_index, size_t space_size, u32 nv_attributes, const u8 *nv_policy, size_t nv_policy_size) { /* * Calculate the offset of the nv_policy piece by adding each of the * chunks below. */ const int platform_len = sizeof(u32); const int session_hdr_len = 13; const int message_len = 14; uint offset = TPM2_HDR_LEN + platform_len + session_hdr_len + message_len; u8 command_v2[COMMAND_BUFFER_SIZE] = { /* header 10 bytes */ tpm_u16(TPM2_ST_SESSIONS), /* TAG */ tpm_u32(offset + nv_policy_size + 2),/* Length */ tpm_u32(TPM2_CC_NV_DEFINE_SPACE),/* Command code */ /* handles 4 bytes */ tpm_u32(TPM2_RH_PLATFORM), /* Primary platform seed */ /* session header 13 bytes */ tpm_u32(9), /* Header size */ tpm_u32(TPM2_RS_PW), /* Password authorisation */ tpm_u16(0), /* nonce_size */ 0, /* session_attrs */ tpm_u16(0), /* auth_size */ /* message 14 bytes + policy */ tpm_u16(message_len + nv_policy_size), /* size */ tpm_u32(space_index), tpm_u16(TPM2_ALG_SHA256), tpm_u32(nv_attributes), tpm_u16(nv_policy_size), /* * nv_policy * space_size */ }; int ret; /* * Fill the command structure starting from the first buffer: * - the password (if any) */ ret = pack_byte_string(command_v2, sizeof(command_v2), "sw", offset, nv_policy, nv_policy_size, offset + nv_policy_size, space_size); if (ret) return TPM_LIB_ERROR; return tpm_sendrecv_command(dev, command_v2, NULL, NULL); } u32 tpm2_pcr_extend(struct udevice *dev, u32 index, u32 algorithm, const u8 *digest, u32 digest_len) { /* Length of the message header, up to start of digest */ uint offset = 33; u8 command_v2[COMMAND_BUFFER_SIZE] = { tpm_u16(TPM2_ST_SESSIONS), /* TAG */ tpm_u32(offset + digest_len), /* Length */ tpm_u32(TPM2_CC_PCR_EXTEND), /* Command code */ /* HANDLE */ tpm_u32(index), /* Handle (PCR Index) */ /* AUTH_SESSION */ tpm_u32(9), /* Authorization size */ tpm_u32(TPM2_RS_PW), /* Session handle */ tpm_u16(0), /* Size of */ /* (if any) */ 0, /* Attributes: Cont/Excl/Rst */ tpm_u16(0), /* Size of */ /* (if any) */ /* hashes */ tpm_u32(1), /* Count (number of hashes) */ tpm_u16(algorithm), /* Algorithm of the hash */ /* STRING(digest) Digest */ }; int ret; if (!digest) return -EINVAL; /* * Fill the command structure starting from the first buffer: * - the digest */ ret = pack_byte_string(command_v2, sizeof(command_v2), "s", offset, digest, digest_len); if (ret) return TPM_LIB_ERROR; return tpm_sendrecv_command(dev, command_v2, NULL, NULL); } u32 tpm2_nv_read_value(struct udevice *dev, u32 index, void *data, u32 count) { u8 command_v2[COMMAND_BUFFER_SIZE] = { /* header 10 bytes */ tpm_u16(TPM2_ST_SESSIONS), /* TAG */ tpm_u32(10 + 8 + 4 + 9 + 4), /* Length */ tpm_u32(TPM2_CC_NV_READ), /* Command code */ /* handles 8 bytes */ tpm_u32(TPM2_RH_PLATFORM), /* Primary platform seed */ tpm_u32(HR_NV_INDEX + index), /* Password authorisation */ /* AUTH_SESSION */ tpm_u32(9), /* Authorization size */ tpm_u32(TPM2_RS_PW), /* Session handle */ tpm_u16(0), /* Size of */ /* (if any) */ 0, /* Attributes: Cont/Excl/Rst */ tpm_u16(0), /* Size of */ /* (if any) */ tpm_u16(count), /* Number of bytes */ tpm_u16(0), /* Offset */ }; size_t response_len = COMMAND_BUFFER_SIZE; u8 response[COMMAND_BUFFER_SIZE]; int ret; u16 tag; u32 size, code; ret = tpm_sendrecv_command(dev, command_v2, response, &response_len); if (ret) return log_msg_ret("read", ret); if (unpack_byte_string(response, response_len, "wdds", 0, &tag, 2, &size, 6, &code, 16, data, count)) return TPM_LIB_ERROR; return 0; } u32 tpm2_nv_write_value(struct udevice *dev, u32 index, const void *data, u32 count) { struct tpm_chip_priv *priv = dev_get_uclass_priv(dev); uint offset = 10 + 8 + 4 + 9 + 2; uint len = offset + count + 2; /* Use empty password auth if platform hierarchy is disabled */ u32 auth = priv->plat_hier_disabled ? HR_NV_INDEX + index : TPM2_RH_PLATFORM; u8 command_v2[COMMAND_BUFFER_SIZE] = { /* header 10 bytes */ tpm_u16(TPM2_ST_SESSIONS), /* TAG */ tpm_u32(len), /* Length */ tpm_u32(TPM2_CC_NV_WRITE), /* Command code */ /* handles 8 bytes */ tpm_u32(auth), /* Primary platform seed */ tpm_u32(HR_NV_INDEX + index), /* Password authorisation */ /* AUTH_SESSION */ tpm_u32(9), /* Authorization size */ tpm_u32(TPM2_RS_PW), /* Session handle */ tpm_u16(0), /* Size of */ /* (if any) */ 0, /* Attributes: Cont/Excl/Rst */ tpm_u16(0), /* Size of */ /* (if any) */ tpm_u16(count), }; size_t response_len = COMMAND_BUFFER_SIZE; u8 response[COMMAND_BUFFER_SIZE]; int ret; ret = pack_byte_string(command_v2, sizeof(command_v2), "sw", offset, data, count, offset + count, 0); if (ret) return TPM_LIB_ERROR; return tpm_sendrecv_command(dev, command_v2, response, &response_len); } u32 tpm2_pcr_read(struct udevice *dev, u32 idx, unsigned int idx_min_sz, u16 algorithm, void *data, u32 digest_len, unsigned int *updates) { u8 idx_array_sz = max(idx_min_sz, DIV_ROUND_UP(idx, 8)); u8 command_v2[COMMAND_BUFFER_SIZE] = { tpm_u16(TPM2_ST_NO_SESSIONS), /* TAG */ tpm_u32(17 + idx_array_sz), /* Length */ tpm_u32(TPM2_CC_PCR_READ), /* Command code */ /* TPML_PCR_SELECTION */ tpm_u32(1), /* Number of selections */ tpm_u16(algorithm), /* Algorithm of the hash */ idx_array_sz, /* Array size for selection */ /* bitmap(idx) Selected PCR bitmap */ }; size_t response_len = COMMAND_BUFFER_SIZE; u8 response[COMMAND_BUFFER_SIZE]; unsigned int pcr_sel_idx = idx / 8; u8 pcr_sel_bit = BIT(idx % 8); unsigned int counter = 0; int ret; if (pack_byte_string(command_v2, COMMAND_BUFFER_SIZE, "b", 17 + pcr_sel_idx, pcr_sel_bit)) return TPM_LIB_ERROR; ret = tpm_sendrecv_command(dev, command_v2, response, &response_len); if (ret) return ret; if (digest_len > response_len) return TPM_LIB_ERROR; if (unpack_byte_string(response, response_len, "ds", 10, &counter, response_len - digest_len, data, digest_len)) return TPM_LIB_ERROR; if (updates) *updates = counter; return 0; } u32 tpm2_get_capability(struct udevice *dev, u32 capability, u32 property, void *buf, size_t prop_count) { u8 command_v2[COMMAND_BUFFER_SIZE] = { tpm_u16(TPM2_ST_NO_SESSIONS), /* TAG */ tpm_u32(22), /* Length */ tpm_u32(TPM2_CC_GET_CAPABILITY), /* Command code */ tpm_u32(capability), /* Capability */ tpm_u32(property), /* Property */ tpm_u32(prop_count), /* Property count */ }; u8 response[COMMAND_BUFFER_SIZE]; size_t response_len = COMMAND_BUFFER_SIZE; unsigned int properties_off; int ret; ret = tpm_sendrecv_command(dev, command_v2, response, &response_len); if (ret) return ret; /* * In the response buffer, the properties are located after the: * tag (u16), response size (u32), response code (u32), * YES/NO flag (u8), TPM_CAP (u32). */ properties_off = sizeof(u16) + sizeof(u32) + sizeof(u32) + sizeof(u8) + sizeof(u32); memcpy(buf, &response[properties_off], response_len - properties_off); return 0; } static int tpm2_get_num_pcr(struct udevice *dev, u32 *num_pcr) { u8 response[(sizeof(struct tpms_capability_data) - offsetof(struct tpms_capability_data, data))]; u32 properties_offset = offsetof(struct tpml_tagged_tpm_property, tpm_property) + offsetof(struct tpms_tagged_property, value); u32 ret; memset(response, 0, sizeof(response)); ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES, TPM2_PT_PCR_COUNT, response, 1); if (ret) return ret; *num_pcr = get_unaligned_be32(response + properties_offset); if (*num_pcr > TPM2_MAX_PCRS) { printf("%s: too many pcrs: %u\n", __func__, *num_pcr); return -E2BIG; } return 0; } static bool tpm2_is_active_pcr(struct tpms_pcr_selection *selection) { int i; /* * check the pcr_select. If at least one of the PCRs supports the * algorithm add it on the active ones */ for (i = 0; i < selection->size_of_select; i++) { if (selection->pcr_select[i]) return true; } return false; } int tpm2_get_pcr_info(struct udevice *dev, u32 *supported_pcr, u32 *active_pcr, u32 *pcr_banks) { u8 response[(sizeof(struct tpms_capability_data) - offsetof(struct tpms_capability_data, data))]; struct tpml_pcr_selection pcrs; u32 num_pcr; size_t i; u32 ret; *supported_pcr = 0; *active_pcr = 0; *pcr_banks = 0; memset(response, 0, sizeof(response)); ret = tpm2_get_capability(dev, TPM2_CAP_PCRS, 0, response, 1); if (ret) return ret; pcrs.count = get_unaligned_be32(response); /* * We only support 5 algorithms for now so check against that * instead of TPM2_NUM_PCR_BANKS */ if (pcrs.count > ARRAY_SIZE(hash_algo_list) || pcrs.count < 1) { printf("%s: too many pcrs: %u\n", __func__, pcrs.count); return -EMSGSIZE; } ret = tpm2_get_num_pcr(dev, &num_pcr); if (ret) return ret; for (i = 0; i < pcrs.count; i++) { /* * Definition of TPMS_PCR_SELECTION Structure * hash: u16 * size_of_select: u8 * pcr_select: u8 array * * The offsets depend on the number of the device PCRs * so we have to calculate them based on that */ u32 hash_offset = offsetof(struct tpml_pcr_selection, selection) + i * offsetof(struct tpms_pcr_selection, pcr_select) + i * ((num_pcr + 7) / 8); u32 size_select_offset = hash_offset + offsetof(struct tpms_pcr_selection, size_of_select); u32 pcr_select_offset = hash_offset + offsetof(struct tpms_pcr_selection, pcr_select); pcrs.selection[i].hash = get_unaligned_be16(response + hash_offset); pcrs.selection[i].size_of_select = __get_unaligned_be(response + size_select_offset); if (pcrs.selection[i].size_of_select > TPM2_PCR_SELECT_MAX) { printf("%s: pcrs selection too large: %u\n", __func__, pcrs.selection[i].size_of_select); return -ENOBUFS; } /* copy the array of pcr_select */ memcpy(pcrs.selection[i].pcr_select, response + pcr_select_offset, pcrs.selection[i].size_of_select); } for (i = 0; i < pcrs.count; i++) { u32 hash_mask = tpm2_algorithm_to_mask(pcrs.selection[i].hash); if (hash_mask) { *supported_pcr |= hash_mask; if (tpm2_is_active_pcr(&pcrs.selection[i])) *active_pcr |= hash_mask; } else { printf("%s: unknown algorithm %x\n", __func__, pcrs.selection[i].hash); } } *pcr_banks = pcrs.count; return 0; } u32 tpm2_dam_reset(struct udevice *dev, const char *pw, const ssize_t pw_sz) { u8 command_v2[COMMAND_BUFFER_SIZE] = { tpm_u16(TPM2_ST_SESSIONS), /* TAG */ tpm_u32(27 + pw_sz), /* Length */ tpm_u32(TPM2_CC_DAM_RESET), /* Command code */ /* HANDLE */ tpm_u32(TPM2_RH_LOCKOUT), /* TPM resource handle */ /* AUTH_SESSION */ tpm_u32(9 + pw_sz), /* Authorization size */ tpm_u32(TPM2_RS_PW), /* Session handle */ tpm_u16(0), /* Size of */ /* (if any) */ 0, /* Attributes: Cont/Excl/Rst */ tpm_u16(pw_sz), /* Size of */ /* STRING(pw) (if any) */ }; unsigned int offset = 27; int ret; /* * Fill the command structure starting from the first buffer: * - the password (if any) */ ret = pack_byte_string(command_v2, sizeof(command_v2), "s", offset, pw, pw_sz); offset += pw_sz; if (ret) return TPM_LIB_ERROR; return tpm_sendrecv_command(dev, command_v2, NULL, NULL); } u32 tpm2_dam_parameters(struct udevice *dev, const char *pw, const ssize_t pw_sz, unsigned int max_tries, unsigned int recovery_time, unsigned int lockout_recovery) { u8 command_v2[COMMAND_BUFFER_SIZE] = { tpm_u16(TPM2_ST_SESSIONS), /* TAG */ tpm_u32(27 + pw_sz + 12), /* Length */ tpm_u32(TPM2_CC_DAM_PARAMETERS), /* Command code */ /* HANDLE */ tpm_u32(TPM2_RH_LOCKOUT), /* TPM resource handle */ /* AUTH_SESSION */ tpm_u32(9 + pw_sz), /* Authorization size */ tpm_u32(TPM2_RS_PW), /* Session handle */ tpm_u16(0), /* Size of */ /* (if any) */ 0, /* Attributes: Cont/Excl/Rst */ tpm_u16(pw_sz), /* Size of */ /* STRING(pw) (if any) */ /* LOCKOUT PARAMETERS */ /* tpm_u32(max_tries) Max tries (0, always lock) */ /* tpm_u32(recovery_time) Recovery time (0, no lock) */ /* tpm_u32(lockout_recovery) Lockout recovery */ }; unsigned int offset = 27; int ret; /* * Fill the command structure starting from the first buffer: * - the password (if any) * - max tries * - recovery time * - lockout recovery */ ret = pack_byte_string(command_v2, sizeof(command_v2), "sddd", offset, pw, pw_sz, offset + pw_sz, max_tries, offset + pw_sz + 4, recovery_time, offset + pw_sz + 8, lockout_recovery); offset += pw_sz + 12; if (ret) return TPM_LIB_ERROR; return tpm_sendrecv_command(dev, command_v2, NULL, NULL); } int tpm2_change_auth(struct udevice *dev, u32 handle, const char *newpw, const ssize_t newpw_sz, const char *oldpw, const ssize_t oldpw_sz) { unsigned int offset = 27; u8 command_v2[COMMAND_BUFFER_SIZE] = { tpm_u16(TPM2_ST_SESSIONS), /* TAG */ tpm_u32(offset + oldpw_sz + 2 + newpw_sz), /* Length */ tpm_u32(TPM2_CC_HIERCHANGEAUTH), /* Command code */ /* HANDLE */ tpm_u32(handle), /* TPM resource handle */ /* AUTH_SESSION */ tpm_u32(9 + oldpw_sz), /* Authorization size */ tpm_u32(TPM2_RS_PW), /* Session handle */ tpm_u16(0), /* Size of */ /* (if any) */ 0, /* Attributes: Cont/Excl/Rst */ tpm_u16(oldpw_sz) /* Size of */ /* STRING(oldpw) (if any) */ /* TPM2B_AUTH (TPM2B_DIGEST) */ /* tpm_u16(newpw_sz) Digest size, new pw length */ /* STRING(newpw) Digest buffer, new pw */ }; int ret; /* * Fill the command structure starting from the first buffer: * - the old password (if any) * - size of the new password * - new password */ ret = pack_byte_string(command_v2, sizeof(command_v2), "sws", offset, oldpw, oldpw_sz, offset + oldpw_sz, newpw_sz, offset + oldpw_sz + 2, newpw, newpw_sz); offset += oldpw_sz + 2 + newpw_sz; if (ret) return TPM_LIB_ERROR; return tpm_sendrecv_command(dev, command_v2, NULL, NULL); } u32 tpm2_pcr_setauthpolicy(struct udevice *dev, const char *pw, const ssize_t pw_sz, u32 index, const char *key) { u8 command_v2[COMMAND_BUFFER_SIZE] = { tpm_u16(TPM2_ST_SESSIONS), /* TAG */ tpm_u32(35 + pw_sz + TPM2_DIGEST_LEN), /* Length */ tpm_u32(TPM2_CC_PCR_SETAUTHPOL), /* Command code */ /* HANDLE */ tpm_u32(TPM2_RH_PLATFORM), /* TPM resource handle */ /* AUTH_SESSION */ tpm_u32(9 + pw_sz), /* Authorization size */ tpm_u32(TPM2_RS_PW), /* session handle */ tpm_u16(0), /* Size of */ /* (if any) */ 0, /* Attributes: Cont/Excl/Rst */ tpm_u16(pw_sz) /* Size of */ /* STRING(pw) (if any) */ /* TPM2B_AUTH (TPM2B_DIGEST) */ /* tpm_u16(TPM2_DIGEST_LEN) Digest size length */ /* STRING(key) Digest buffer (PCR key) */ /* TPMI_ALG_HASH */ /* tpm_u16(TPM2_ALG_SHA256) Algorithm of the hash */ /* TPMI_DH_PCR */ /* tpm_u32(index), PCR Index */ }; unsigned int offset = 27; int ret; /* * Fill the command structure starting from the first buffer: * - the password (if any) * - the PCR key length * - the PCR key * - the hash algorithm * - the PCR index */ ret = pack_byte_string(command_v2, sizeof(command_v2), "swswd", offset, pw, pw_sz, offset + pw_sz, TPM2_DIGEST_LEN, offset + pw_sz + 2, key, TPM2_DIGEST_LEN, offset + pw_sz + 2 + TPM2_DIGEST_LEN, TPM2_ALG_SHA256, offset + pw_sz + 4 + TPM2_DIGEST_LEN, index); offset += pw_sz + 2 + TPM2_DIGEST_LEN + 2 + 4; if (ret) return TPM_LIB_ERROR; return tpm_sendrecv_command(dev, command_v2, NULL, NULL); } u32 tpm2_pcr_setauthvalue(struct udevice *dev, const char *pw, const ssize_t pw_sz, u32 index, const char *key, const ssize_t key_sz) { u8 command_v2[COMMAND_BUFFER_SIZE] = { tpm_u16(TPM2_ST_SESSIONS), /* TAG */ tpm_u32(33 + pw_sz + TPM2_DIGEST_LEN), /* Length */ tpm_u32(TPM2_CC_PCR_SETAUTHVAL), /* Command code */ /* HANDLE */ tpm_u32(index), /* Handle (PCR Index) */ /* AUTH_SESSION */ tpm_u32(9 + pw_sz), /* Authorization size */ tpm_u32(TPM2_RS_PW), /* session handle */ tpm_u16(0), /* Size of */ /* (if any) */ 0, /* Attributes: Cont/Excl/Rst */ tpm_u16(pw_sz), /* Size of */ /* STRING(pw) (if any) */ /* TPM2B_DIGEST */ /* tpm_u16(key_sz) Key length */ /* STRING(key) Key */ }; unsigned int offset = 27; int ret; /* * Fill the command structure starting from the first buffer: * - the password (if any) * - the number of digests, 1 in our case * - the algorithm, sha256 in our case * - the digest (64 bytes) */ ret = pack_byte_string(command_v2, sizeof(command_v2), "sws", offset, pw, pw_sz, offset + pw_sz, key_sz, offset + pw_sz + 2, key, key_sz); offset += pw_sz + 2 + key_sz; if (ret) return TPM_LIB_ERROR; return tpm_sendrecv_command(dev, command_v2, NULL, NULL); } u32 tpm2_get_random(struct udevice *dev, void *data, u32 count) { const u8 command_v2[10] = { tpm_u16(TPM2_ST_NO_SESSIONS), tpm_u32(12), tpm_u32(TPM2_CC_GET_RANDOM), }; u8 buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE]; const size_t data_size_offset = 10; const size_t data_offset = 12; size_t response_length = sizeof(response); u32 data_size; u8 *out = data; while (count > 0) { u32 this_bytes = min((size_t)count, sizeof(response) - data_offset); u32 err; if (pack_byte_string(buf, sizeof(buf), "sw", 0, command_v2, sizeof(command_v2), sizeof(command_v2), this_bytes)) return TPM_LIB_ERROR; err = tpm_sendrecv_command(dev, buf, response, &response_length); if (err) return err; if (unpack_byte_string(response, response_length, "w", data_size_offset, &data_size)) return TPM_LIB_ERROR; if (data_size > this_bytes) return TPM_LIB_ERROR; if (unpack_byte_string(response, response_length, "s", data_offset, out, data_size)) return TPM_LIB_ERROR; count -= data_size; out += data_size; } return 0; } u32 tpm2_write_lock(struct udevice *dev, u32 index) { u8 command_v2[COMMAND_BUFFER_SIZE] = { /* header 10 bytes */ tpm_u16(TPM2_ST_SESSIONS), /* TAG */ tpm_u32(10 + 8 + 13), /* Length */ tpm_u32(TPM2_CC_NV_WRITELOCK), /* Command code */ /* handles 8 bytes */ tpm_u32(TPM2_RH_PLATFORM), /* Primary platform seed */ tpm_u32(HR_NV_INDEX + index), /* Password authorisation */ /* session header 9 bytes */ tpm_u32(9), /* Header size */ tpm_u32(TPM2_RS_PW), /* Password authorisation */ tpm_u16(0), /* nonce_size */ 0, /* session_attrs */ tpm_u16(0), /* auth_size */ }; return tpm_sendrecv_command(dev, command_v2, NULL, NULL); } u32 tpm2_disable_platform_hierarchy(struct udevice *dev) { struct tpm_chip_priv *priv = dev_get_uclass_priv(dev); u8 command_v2[COMMAND_BUFFER_SIZE] = { /* header 10 bytes */ tpm_u16(TPM2_ST_SESSIONS), /* TAG */ tpm_u32(10 + 4 + 13 + 5), /* Length */ tpm_u32(TPM2_CC_HIER_CONTROL), /* Command code */ /* 4 bytes */ tpm_u32(TPM2_RH_PLATFORM), /* Primary platform seed */ /* session header 9 bytes */ tpm_u32(9), /* Header size */ tpm_u32(TPM2_RS_PW), /* Password authorisation */ tpm_u16(0), /* nonce_size */ 0, /* session_attrs */ tpm_u16(0), /* auth_size */ /* payload 5 bytes */ tpm_u32(TPM2_RH_PLATFORM), /* Hierarchy to disable */ 0, /* 0=disable */ }; int ret; ret = tpm_sendrecv_command(dev, command_v2, NULL, NULL); log_info("ret=%s, %x\n", dev->name, ret); if (ret) return ret; priv->plat_hier_disabled = true; return 0; } u32 tpm2_submit_command(struct udevice *dev, const u8 *sendbuf, u8 *recvbuf, size_t *recv_size) { return tpm_sendrecv_command(dev, sendbuf, recvbuf, recv_size); } u32 tpm2_report_state(struct udevice *dev, uint vendor_cmd, uint vendor_subcmd, u8 *recvbuf, size_t *recv_size) { u8 command_v2[COMMAND_BUFFER_SIZE] = { /* header 10 bytes */ tpm_u16(TPM2_ST_NO_SESSIONS), /* TAG */ tpm_u32(10 + 2), /* Length */ tpm_u32(vendor_cmd), /* Command code */ tpm_u16(vendor_subcmd), }; int ret; ret = tpm_sendrecv_command(dev, command_v2, recvbuf, recv_size); log_debug("ret=%s, %x\n", dev->name, ret); if (ret) return ret; if (*recv_size < 12) return -ENODATA; *recv_size -= 12; memcpy(recvbuf, recvbuf + 12, *recv_size); return 0; } u32 tpm2_enable_nvcommits(struct udevice *dev, uint vendor_cmd, uint vendor_subcmd) { u8 command_v2[COMMAND_BUFFER_SIZE] = { /* header 10 bytes */ tpm_u16(TPM2_ST_NO_SESSIONS), /* TAG */ tpm_u32(10 + 2), /* Length */ tpm_u32(vendor_cmd), /* Command code */ tpm_u16(vendor_subcmd), }; int ret; ret = tpm_sendrecv_command(dev, command_v2, NULL, NULL); log_debug("ret=%s, %x\n", dev->name, ret); if (ret) return ret; return 0; } enum tpm2_algorithms tpm2_name_to_algorithm(const char *name) { size_t i; for (i = 0; i < ARRAY_SIZE(hash_algo_list); ++i) { if (!strcasecmp(name, hash_algo_list[i].hash_name)) return hash_algo_list[i].hash_alg; } printf("%s: unsupported algorithm %s\n", __func__, name); return -EINVAL; } const char *tpm2_algorithm_name(enum tpm2_algorithms algo) { size_t i; for (i = 0; i < ARRAY_SIZE(hash_algo_list); ++i) { if (hash_algo_list[i].hash_alg == algo) return hash_algo_list[i].hash_name; } return ""; } u32 tpm2_algorithm_to_mask(enum tpm2_algorithms algo) { size_t i; for (i = 0; i < ARRAY_SIZE(hash_algo_list); i++) { if (hash_algo_list[i].hash_alg == algo) return hash_algo_list[i].hash_mask; } return 0; }