security/vboot: Add Support for Intel PTT
Add support for Intel PTT. For supporting Intel PTT we need to disable
read and write access to the TPM NVRAM during the bootblock. TPM NVRAM
will only be available once the DRAM is initialized. To circumvent this,
we mock secdata if HAVE_INTEL_PTT is set. The underlying problem is,
that the iTPM only supports a stripped down instruction set while the
Intel ME is not fully booted up. Details can be found in Intel document
number 571993 - Paragraph 2.10.
Change-Id: I08c9a839f53f96506be5fb68f7c1ed5bf6692505
Signed-off-by: Christian Walter <christian.walter@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34510
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
diff --git a/src/drivers/intel/ptt/Kconfig b/src/drivers/intel/ptt/Kconfig
index c013f42..fb70f9a 100644
--- a/src/drivers/intel/ptt/Kconfig
+++ b/src/drivers/intel/ptt/Kconfig
@@ -1,5 +1,6 @@
config HAVE_INTEL_PTT
bool
default n
+ select VBOOT_MOCK_SECDATA if VBOOT
help
Activate if your platform has Intel Platform Trust Technology like Intel iTPM and you want to use it.
diff --git a/src/security/vboot/Kconfig b/src/security/vboot/Kconfig
index ea1f738..c5146c6 100644
--- a/src/security/vboot/Kconfig
+++ b/src/security/vboot/Kconfig
@@ -26,10 +26,13 @@
if VBOOT
+comment "Anti-Rollback Protection disabled because mocking secdata is enabled."
+ depends on VBOOT_MOCK_SECDATA
+
config VBOOT_MEASURED_BOOT
bool "Enable Measured Boot"
default n
- depends on !VBOOT_MOCK_SECDATA
+ depends on TPM1 || TPM2
depends on !VBOOT_RETURN_FROM_VERSTAGE
help
Enables measured boot mode in vboot (experimental)
diff --git a/src/security/vboot/Makefile.inc b/src/security/vboot/Makefile.inc
index 6d19529..d554f10 100644
--- a/src/security/vboot/Makefile.inc
+++ b/src/security/vboot/Makefile.inc
@@ -88,6 +88,11 @@
verstage-y += secdata_tpm.c
romstage-$(CONFIG_VBOOT_SEPARATE_VERSTAGE) += secdata_tpm.c
endif
+
+ifneq ($(CONFIG_TPM1)$(CONFIG_TPM2),)
+verstage-y += tpm_common.c
+endif
+
romstage-y += vboot_logic.c
romstage-y += common.c
diff --git a/src/security/vboot/antirollback.h b/src/security/vboot/antirollback.h
index 62d2e20..5af9236 100644
--- a/src/security/vboot/antirollback.h
+++ b/src/security/vboot/antirollback.h
@@ -83,11 +83,4 @@
/* Lock down recovery hash space in TPM. */
uint32_t antirollback_lock_space_rec_hash(void);
-/* Start of the root of trust */
-uint32_t vboot_setup_tpm(struct vb2_context *ctx);
-
-/* vboot_extend_pcr function for vb2 context */
-uint32_t vboot_extend_pcr(struct vb2_context *ctx, int pcr,
- enum vb2_pcr_digest which_digest);
-
#endif /* ANTIROLLBACK_H_ */
diff --git a/src/security/vboot/secdata_mock.c b/src/security/vboot/secdata_mock.c
index 3075d33..43206df 100644
--- a/src/security/vboot/secdata_mock.c
+++ b/src/security/vboot/secdata_mock.c
@@ -43,12 +43,6 @@
return VB2_SUCCESS;
}
-uint32_t vboot_extend_pcr(struct vb2_context *ctx, int pcr,
- enum vb2_pcr_digest which_digest)
-{
- return VB2_SUCCESS;
-}
-
uint32_t antirollback_read_space_firmware(struct vb2_context *ctx)
{
vb2api_secdata_create(ctx);
@@ -60,7 +54,7 @@
return VB2_SUCCESS;
}
-uint32_t antirollback_lock_space_firmware()
+uint32_t antirollback_lock_space_firmware(void)
{
return VB2_SUCCESS;
}
diff --git a/src/security/vboot/secdata_tpm.c b/src/security/vboot/secdata_tpm.c
index 39cd614..09c7e72 100644
--- a/src/security/vboot/secdata_tpm.c
+++ b/src/security/vboot/secdata_tpm.c
@@ -33,6 +33,7 @@
*/
#include <security/vboot/antirollback.h>
+#include <security/vboot/tpm_common.h>
#include <stdlib.h>
#include <string.h>
#include <security/tpm/tspi.h>
@@ -65,31 +66,6 @@
static uint32_t safe_write(uint32_t index, const void *data, uint32_t length);
-uint32_t vboot_extend_pcr(struct vb2_context *ctx, int pcr,
- enum vb2_pcr_digest which_digest)
-{
- uint8_t buffer[VB2_PCR_DIGEST_RECOMMENDED_SIZE];
- uint32_t size = sizeof(buffer);
- int rv;
-
- rv = vb2api_get_pcr_digest(ctx, which_digest, buffer, &size);
- if (rv != VB2_SUCCESS)
- return rv;
- if (size < TPM_PCR_MINIMUM_DIGEST_SIZE)
- return VB2_ERROR_UNKNOWN;
-
- switch (which_digest) {
- case BOOT_MODE_PCR:
- return tpm_extend_pcr(pcr, VB2_HASH_SHA1, buffer, size,
- TPM_PCR_GBB_FLAGS_NAME);
- case HWID_DIGEST_PCR:
- return tpm_extend_pcr(pcr, VB2_HASH_SHA256, buffer,
- size, TPM_PCR_GBB_HWID_NAME);
- default:
- return VB2_ERROR_UNKNOWN;
- }
-}
-
static uint32_t read_space_firmware(struct vb2_context *ctx)
{
int attempts = 3;
@@ -443,25 +419,10 @@
return TPM_SUCCESS;
}
-uint32_t vboot_setup_tpm(struct vb2_context *ctx)
-{
- uint32_t result;
-
- result = tpm_setup(ctx->flags & VB2_CONTEXT_S3_RESUME);
- if (result == TPM_E_MUST_REBOOT)
- ctx->flags |= VB2_CONTEXT_SECDATA_WANTS_REBOOT;
-
- return result;
-}
-
uint32_t antirollback_read_space_firmware(struct vb2_context *ctx)
{
uint32_t rv;
- rv = vboot_setup_tpm(ctx);
- if (rv)
- return rv;
-
/* Read the firmware space. */
rv = read_space_firmware(ctx);
if (rv == TPM_E_BADINDEX) {
diff --git a/src/security/vboot/tpm_common.c b/src/security/vboot/tpm_common.c
new file mode 100644
index 0000000..1a07ef6
--- /dev/null
+++ b/src/security/vboot/tpm_common.c
@@ -0,0 +1,58 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * 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 <security/tpm/tspi.h>
+#include <vb2_api.h>
+#include <security/vboot/tpm_common.h>
+
+#define TPM_PCR_BOOT_MODE "VBOOT: boot mode"
+#define TPM_PCR_GBB_HWID_NAME "VBOOT: GBB HWID"
+
+uint32_t vboot_setup_tpm(struct vb2_context *ctx)
+{
+ uint32_t result;
+
+ result = tpm_setup(ctx->flags & VB2_CONTEXT_S3_RESUME);
+ if (result == TPM_E_MUST_REBOOT)
+ ctx->flags |= VB2_CONTEXT_SECDATA_WANTS_REBOOT;
+
+ return result;
+}
+
+uint32_t vboot_extend_pcr(struct vb2_context *ctx, int pcr,
+ enum vb2_pcr_digest which_digest)
+{
+ uint8_t buffer[VB2_PCR_DIGEST_RECOMMENDED_SIZE];
+ uint32_t size = sizeof(buffer);
+ int rv;
+
+ rv = vb2api_get_pcr_digest(ctx, which_digest, buffer, &size);
+ if (rv != VB2_SUCCESS)
+ return rv;
+ if (size < TPM_PCR_MINIMUM_DIGEST_SIZE)
+ return VB2_ERROR_UNKNOWN;
+
+ switch (which_digest) {
+ /* SHA1 of (devmode|recmode|keyblock) bits */
+ case BOOT_MODE_PCR:
+ return tpm_extend_pcr(pcr, VB2_HASH_SHA1, buffer, size,
+ TPM_PCR_BOOT_MODE);
+ /* SHA256 of HWID */
+ case HWID_DIGEST_PCR:
+ return tpm_extend_pcr(pcr, VB2_HASH_SHA256, buffer,
+ size, TPM_PCR_GBB_HWID_NAME);
+ default:
+ return VB2_ERROR_UNKNOWN;
+ }
+}
diff --git a/src/security/vboot/tpm_common.h b/src/security/vboot/tpm_common.h
new file mode 100644
index 0000000..6bb32bb
--- /dev/null
+++ b/src/security/vboot/tpm_common.h
@@ -0,0 +1,29 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * 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.
+ */
+
+#if CONFIG(TPM1) || CONFIG(TPM2)
+
+/* Start of the root of trust */
+uint32_t vboot_setup_tpm(struct vb2_context *ctx);
+
+/* vboot_extend_pcr function for vb2 context */
+uint32_t vboot_extend_pcr(struct vb2_context *ctx, int pcr,
+ enum vb2_pcr_digest which_digest);
+
+#else
+
+#define vboot_setup_tpm(ctx) 0
+
+#define vboot_extend_pcr(ctx, pcr, which_digest) 0
+
+#endif
diff --git a/src/security/vboot/vboot_logic.c b/src/security/vboot/vboot_logic.c
index 2468f5f..c61d6be 100644
--- a/src/security/vboot/vboot_logic.c
+++ b/src/security/vboot/vboot_logic.c
@@ -25,6 +25,7 @@
#include <security/vboot/misc.h>
#include <security/vboot/vbnv.h>
#include <security/vboot/vboot_crtm.h>
+#include <security/vboot/tpm_common.h>
#include "antirollback.h"
@@ -334,7 +335,9 @@
* check the return value here because vb2api_fw_phase1 will catch
* invalid secdata and tell us what to do (=reboot). */
timestamp_add_now(TS_START_TPMINIT);
- antirollback_read_space_firmware(&ctx);
+ rv = vboot_setup_tpm(&ctx);
+ if (rv)
+ antirollback_read_space_firmware(&ctx);
timestamp_add_now(TS_END_TPMINIT);
/* Enable measured boot mode */