util/cbmem: add parsing of TPM logs per specs

CBMEM can contain log in different forms (at most one is present):
 - coreboot-specific format (CBMEM_ID_TPM_CB_LOG exported as
   LB_TAG_TPM_CB_LOG)
 - TPM1.2 format (CBMEM_ID_TCPA_TCG_LOG)
 - TPM2 format (CBMEM_ID_TPM2_TCG_LOG)

The last two follow specifications by Trusted Computing Group, but until
now cbmem couldn't print them.  These formats were added not so long ago
in:
 - commit 4191dbf0c9a5 ("security/tpm: add TPM log format as per 1.2
   spec")
 - commit 53db677586e3 ("security/tpm: add TPM log format as per 2.0
   spec")

These changes make cbmem utility check for existence of TPM1.2/TPM2 logs
in CBMEM and add code necessary for parsing and printing of their
entries.

TEST=`cbmem -L` for CONFIG_TPM1=y case
TCPA log:
	Specification: 1.21
	Platform class: PC Client
TCPA log entry 1:
	PCR: 2
	Event type: Action
	Digest: 5622416ea417186aa1ac32b32c527ac09009fb5e
	Event data: FMAP: FMAP

TEST=`cbmem -L` for CONFIG_TPM2=y case
TPM2 log:
	Specification: 2.00
	Platform class: PC Client
TPM2 log entry 1:
	PCR: 2
	Event type: Action
	Digests:
		 SHA256: 68d27f08cb261463a6d004524333ac5db1a3c2166721785a6061327b6538657c
	Event data: FMAP: FMAP

Change-Id: Ib76dc7dec56dd1789a219539a1ac05a958f47a5c
Ticket: https://ticket.coreboot.org/issues/425
Signed-off-by: Krystian Hebel <krystian.hebel@3mdeb.com>
Signed-off-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Signed-off-by: Sergii Dmytruk <sergii.dmytruk@3mdeb.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68749
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 64 insertions, 0 deletions

diff --git a/src/commonlib/bsd/include/commonlib/bsd/tpm_log_defs.h b/src/commonlib/bsd/include/commonlib/bsd/tpm_log_defs.h
index 3a754173e5..041b636574 100644
--- a/src/commonlib/bsd/include/commonlib/bsd/tpm_log_defs.h
+++ b/src/commonlib/bsd/include/commonlib/bsd/tpm_log_defs.h
@@ -9,6 +9,26 @@
 #define TCPA_SPEC_ID_EVENT_SIGNATURE    "Spec ID Event00"
 #define TCG_EFI_SPEC_ID_EVENT_SIGNATURE "Spec ID Event03"
 
+struct tcpa_log_entry {
+	uint32_t pcr;
+	uint32_t event_type;
+	uint8_t digest[20];
+	uint32_t event_data_size;
+	uint8_t event[0];
+} __packed;
+
+struct tcpa_spec_entry {
+	struct tcpa_log_entry entry;
+	uint8_t signature[16];
+	uint32_t platform_class;
+	uint8_t spec_version_minor;
+	uint8_t spec_version_major;
+	uint8_t spec_errata;
+	uint8_t reserved;
+	uint8_t vendor_info_size;
+	uint8_t vendor_info[0];
+} __packed;
+
 #define TPM2_ALG_ERROR   0x0000
 #define TPM2_ALG_HMAC    0x0005
 #define TPM2_ALG_NULL    0x0010
@@ -56,6 +76,28 @@ struct spec_id_event_data {
 	uint8_t vendor_info_size;
 } __packed;
 
+union tpm_hash_digest {
+	uint8_t sha1[SHA1_DIGEST_SIZE];
+	uint8_t sha256[SHA256_DIGEST_SIZE];
+	uint8_t sm3_256[SM3_256_DIGEST_SIZE];
+	uint8_t sha384[SHA384_DIGEST_SIZE];
+	uint8_t sha512[SHA512_DIGEST_SIZE];
+};
+
+struct tpm_hash_algorithm {
+	uint16_t hashAlg;
+	union tpm_hash_digest digest;
+} __packed;
+
+struct tcg_pcr_event2_header {
+	uint32_t pcr_index;
+	uint32_t event_type;
+	uint32_t digest_count;
+	uint8_t digests[0];
+	/* uint32_t event_size; */
+	/* uint8_t event[0]; */
+} __packed;
+
 struct tpm_digest_sizes {
 	uint16_t alg_id;
 	uint16_t digest_size;
@@ -78,4 +120,26 @@ struct tcg_efi_spec_id_event {
 	/* uint8_t vendor_info[vendor_info_size]; */
 } __packed;
 
+static const char *tpm_event_types[] __maybe_unused = {
+	[EV_PREBOOT_CERT]		= "Reserved",
+	[EV_POST_CODE]			= "POST code",
+	[EV_UNUSED]			= "Unused",
+	[EV_NO_ACTION]			= "No action",
+	[EV_SEPARATOR]			= "Separator",
+	[EV_ACTION]			= "Action",
+	[EV_EVENT_TAG]			= "Event tag",
+	[EV_S_CRTM_CONTENTS]		= "S-CRTM contents",
+	[EV_S_CRTM_VERSION]		= "S-CRTM version",
+	[EV_CPU_MICROCODE]		= "CPU microcode",
+	[EV_PLATFORM_CONFIG_FLAGS]	= "Platform configuration flags",
+	[EV_TABLE_OF_DEVICES]		= "Table of devices",
+	[EV_COMPACT_HASH]		= "Compact hash",
+	[EV_IPL]			= "IPL",
+	[EV_IPL_PARTITION_DATA]		= "IPL partition data",
+	[EV_NONHOST_CODE]		= "Non-host code",
+	[EV_NONHOST_CONFIG]		= "Non-host configuration",
+	[EV_NONHOST_INFO]		= "Non-host information",
+	[EV_OMIT_BOOT_DEVICE_EVENTS]	= "Omit boot device events",
+};
+
 #endif