Philipp Deppenwiese merged this change.
security/tpm: Add TCPA logging functionality
* TCG spec only applies to BIOS or UEFI.
* Therefore implement coreboot TCPA compliant log
in CBMEM.
* Write CBMEM log into the coreboot table for CBMEM tool access
Change-Id: I0a52494f647d21e2587231af26ed13d62b3a72f5
Signed-off-by: Philipp Deppenwiese <zaolin@das-labor.org>
Reviewed-on: https://review.coreboot.org/22867
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
---
M src/commonlib/include/commonlib/cbmem_id.h
A src/commonlib/include/commonlib/tcpa_log_serialized.h
M src/drivers/tpm/tpm.c
M src/security/tpm/Makefile.inc
M src/security/tpm/tspi.h
A src/security/tpm/tspi/log.c
6 files changed, 141 insertions(+), 8 deletions(-)
diff --git a/src/commonlib/include/commonlib/cbmem_id.h b/src/commonlib/include/commonlib/cbmem_id.h
index 3529fef..cc2fed1 100644
--- a/src/commonlib/include/commonlib/cbmem_id.h
+++ b/src/commonlib/include/commonlib/cbmem_id.h
@@ -64,6 +64,7 @@
#define CBMEM_ID_STAGEx_RAW 0x57a9e200
#define CBMEM_ID_STORAGE_DATA 0x53746f72
#define CBMEM_ID_TCPA_LOG 0x54435041
+#define CBMEM_ID_TCPA_COMPLIANT_LOG 0x54445041
#define CBMEM_ID_TIMESTAMP 0x54494d45
#define CBMEM_ID_VBOOT_HANDOFF 0x780074f0
#define CBMEM_ID_VBOOT_SEL_REG 0x780074f1
@@ -120,6 +121,7 @@
{ CBMEM_ID_SMM_SAVE_SPACE, "SMM BACKUP " }, \
{ CBMEM_ID_STORAGE_DATA, "SD/MMC/eMMC" }, \
{ CBMEM_ID_TCPA_LOG, "TCPA LOG " }, \
+ { CBMEM_ID_TCPA_COMPLIANT_LOG, "TCPA COMPLIANT LOG " }, \
{ CBMEM_ID_TIMESTAMP, "TIME STAMP " }, \
{ CBMEM_ID_VBOOT_HANDOFF, "VBOOT " }, \
{ CBMEM_ID_VBOOT_SEL_REG, "VBOOT SEL " }, \
diff --git a/src/commonlib/include/commonlib/tcpa_log_serialized.h b/src/commonlib/include/commonlib/tcpa_log_serialized.h
new file mode 100644
index 0000000..cd6fbec
--- /dev/null
+++ b/src/commonlib/include/commonlib/tcpa_log_serialized.h
@@ -0,0 +1,41 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 Facebook Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __TCPA_LOG_SERIALIZED_H__
+#define __TCPA_LOG_SERIALIZED_H__
+
+#include <compiler.h>
+#include <stdint.h>
+
+#define MAX_TCPA_LOG_ENTRIES 50
+#define TCPA_LOG_STRING_LENGTH 512
+#define TCPA_FORMAT_HASH_LENGTH 128
+#define TCPA_DIGEST_MAX_LENGTH 64
+#define TCPA_PCR_HASH_NAME 256
+
+struct tcpa_entry {
+ uint32_t pcr;
+ uint8_t digest[TCPA_DIGEST_MAX_LENGTH];
+ uint32_t digest_length;
+ uint8_t name[TCPA_PCR_HASH_NAME];
+} __packed;
+
+struct tcpa_table {
+ uint16_t max_entries;
+ uint16_t num_entries;
+ struct tcpa_entry entries[0]; /* Variable number of entries */
+} __packed;
+
+#endif
diff --git a/src/drivers/tpm/tpm.c b/src/drivers/tpm/tpm.c
index e4a81c3..8c68159 100644
--- a/src/drivers/tpm/tpm.c
+++ b/src/drivers/tpm/tpm.c
@@ -30,6 +30,9 @@
#else
tpm_setup(false);
#endif
+
+ // TCPA cbmem log
+ tcpa_log_init();
}
BOOT_STATE_INIT_ENTRY(BS_DEV_INIT, BS_ON_ENTRY, init_tpm_dev, NULL);
diff --git a/src/security/tpm/Makefile.inc b/src/security/tpm/Makefile.inc
index 9157fec..34ead8f 100644
--- a/src/security/tpm/Makefile.inc
+++ b/src/security/tpm/Makefile.inc
@@ -12,11 +12,11 @@
## TSPI
-ramstage-y += tspi/tspi.c
-romstage-y += tspi/tspi.c
+ramstage-y += tspi/tspi.c tspi/log.c
+romstage-y += tspi/tspi.c tspi/log.c
-verstage-$(CONFIG_VBOOT) += tspi/tspi.c
-postcar-$(CONFIG_VBOOT) += tspi/tspi.c
+verstage-$(CONFIG_VBOOT) += tspi/tspi.c tspi/log.c
+postcar-$(CONFIG_VBOOT) += tspi/tspi.c tspi/log.c
endif # CONFIG_TPM1
@@ -36,10 +36,10 @@
## TSPI
-ramstage-y += tspi/tspi.c
-romstage-y += tspi/tspi.c
+ramstage-y += tspi/tspi.c tspi/log.c
+romstage-y += tspi/tspi.c tspi/log.c
-verstage-$(CONFIG_VBOOT) += tspi/tspi.c
-postcar-$(CONFIG_VBOOT) += tspi/tspi.c
+verstage-$(CONFIG_VBOOT) += tspi/tspi.c tspi/log.c
+postcar-$(CONFIG_VBOOT) += tspi/tspi.c tspi/log.c
endif # CONFIG_TPM2
diff --git a/src/security/tpm/tspi.h b/src/security/tpm/tspi.h
index fdc9e1c..01b2984 100644
--- a/src/security/tpm/tspi.h
+++ b/src/security/tpm/tspi.h
@@ -18,6 +18,18 @@
#define TSPI_H_
#include <security/tpm/tss.h>
+#include <commonlib/tcpa_log_serialized.h>
+
+/**
+ * Setup TCPA cbmem log.
+ */
+void tcpa_log_init(void);
+
+/**
+ * Add table entry for cbmem TCPA log.
+ */
+int tcpa_log_add_table_entry(const char *name, const uint32_t pcr,
+ const uint8_t *digest, const size_t digest_length);
/**
* Ask vboot for a digest and extend a TPM PCR with it.
diff --git a/src/security/tpm/tspi/log.c b/src/security/tpm/tspi/log.c
new file mode 100644
index 0000000..6091dfe
--- /dev/null
+++ b/src/security/tpm/tspi/log.c
@@ -0,0 +1,75 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 Facebook Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <string.h>
+#include <cbmem.h>
+#include <console/console.h>
+#include <security/tpm/tspi.h>
+
+void tcpa_log_init(void)
+{
+ const struct cbmem_entry *ce;
+ struct tcpa_table *tclt;
+
+ if (!cbmem_possibly_online())
+ return;
+
+ ce = cbmem_entry_find(CBMEM_ID_TCPA_LOG);
+ if (ce)
+ return;
+
+ tclt = cbmem_add(CBMEM_ID_TCPA_LOG,
+ sizeof(struct tcpa_table) +
+ MAX_TCPA_LOG_ENTRIES *
+ sizeof(struct tcpa_entry));
+
+ if (!tclt)
+ return;
+
+ tclt->max_entries = MAX_TCPA_LOG_ENTRIES;
+ tclt->num_entries = 0;
+
+ printk(BIOS_DEBUG, "TCPA log created at %p\n", tclt);
+}
+
+int tcpa_log_add_table_entry(const char *name, const uint32_t pcr,
+ const uint8_t *digest, const size_t digest_length)
+{
+ MAYBE_STATIC struct tcpa_table *tclt = NULL;
+ struct tcpa_entry *tce;
+
+ if (!cbmem_possibly_online())
+ return -1;
+
+ tclt = cbmem_find(CBMEM_ID_TCPA_LOG);
+ if (!tclt) {
+ printk(BIOS_ERR, "ERROR: No TCPA log table found\n");
+ return -1;
+ }
+
+ if (tclt->num_entries == tclt->max_entries) {
+ printk(BIOS_WARNING, "ERROR: TCPA log table is full\n");
+ return -1;
+ }
+
+ tce = &tclt->entries[tclt->num_entries++];
+
+ memcpy(tce->name, name, TCPA_PCR_HASH_NAME);
+ tce->pcr = pcr;
+ memcpy(tce->digest, digest, digest_length);
+ tce->digest_length = digest_length;
+
+ return 0;
+}
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