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243875eaf9
fw_config image is authenticated using secure boot framework by
adding it into the single root and dual root chain of trust.
The COT for fw_config image looks as below:
+------------------+ +-------------------+
| ROTPK/ROTPK Hash |------>| Trusted Boot fw |
+------------------+ | Certificate |
| (Auth Image) |
/+-------------------+
/ |
/ |
/ |
/ |
L v
+------------------+ +-------------------+
| fw_config hash |------>| fw_config |
| | | (Data Image) |
+------------------+ +-------------------+
Signed-off-by: Louis Mayencourt <louis.mayencourt@arm.com>
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: I08fc8ee95c29a95bb140c807dd06e772474c7367
127 lines
3.3 KiB
C
127 lines
3.3 KiB
C
/*
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* Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <stddef.h>
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#include <platform_def.h>
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#include <drivers/auth/mbedtls/mbedtls_config.h>
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#include <drivers/auth/auth_mod.h>
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#include <drivers/auth/tbbr_cot_common.h>
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#if USE_TBBR_DEFS
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#include <tools_share/tbbr_oid.h>
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#else
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#include <platform_oid.h>
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#endif
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/*
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* The platform must allocate buffers to store the authentication parameters
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* extracted from the certificates. In this case, because of the way the CoT is
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* established, we can reuse some of the buffers on different stages
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*/
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static unsigned char fw_config_hash_buf[HASH_DER_LEN];
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static unsigned char tb_fw_config_hash_buf[HASH_DER_LEN];
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static unsigned char hw_config_hash_buf[HASH_DER_LEN];
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unsigned char tb_fw_hash_buf[HASH_DER_LEN];
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unsigned char scp_fw_hash_buf[HASH_DER_LEN];
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unsigned char nt_world_bl_hash_buf[HASH_DER_LEN];
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/*
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* common Parameter type descriptors across BL1 and BL2
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*/
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auth_param_type_desc_t trusted_nv_ctr = AUTH_PARAM_TYPE_DESC(
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AUTH_PARAM_NV_CTR, TRUSTED_FW_NVCOUNTER_OID);
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auth_param_type_desc_t subject_pk = AUTH_PARAM_TYPE_DESC(
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AUTH_PARAM_PUB_KEY, 0);
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auth_param_type_desc_t sig = AUTH_PARAM_TYPE_DESC(
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AUTH_PARAM_SIG, 0);
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auth_param_type_desc_t sig_alg = AUTH_PARAM_TYPE_DESC(
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AUTH_PARAM_SIG_ALG, 0);
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auth_param_type_desc_t raw_data = AUTH_PARAM_TYPE_DESC(
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AUTH_PARAM_RAW_DATA, 0);
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/* common hash used across BL1 and BL2 */
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auth_param_type_desc_t tb_fw_hash = AUTH_PARAM_TYPE_DESC(
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AUTH_PARAM_HASH, TRUSTED_BOOT_FW_HASH_OID);
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auth_param_type_desc_t tb_fw_config_hash = AUTH_PARAM_TYPE_DESC(
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AUTH_PARAM_HASH, TRUSTED_BOOT_FW_CONFIG_HASH_OID);
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auth_param_type_desc_t fw_config_hash = AUTH_PARAM_TYPE_DESC(
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AUTH_PARAM_HASH, FW_CONFIG_HASH_OID);
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static auth_param_type_desc_t hw_config_hash = AUTH_PARAM_TYPE_DESC(
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AUTH_PARAM_HASH, HW_CONFIG_HASH_OID);
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/* trusted_boot_fw_cert */
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const auth_img_desc_t trusted_boot_fw_cert = {
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.img_id = TRUSTED_BOOT_FW_CERT_ID,
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.img_type = IMG_CERT,
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.parent = NULL,
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.img_auth_methods = (const auth_method_desc_t[AUTH_METHOD_NUM]) {
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[0] = {
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.type = AUTH_METHOD_SIG,
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.param.sig = {
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.pk = &subject_pk,
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.sig = &sig,
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.alg = &sig_alg,
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.data = &raw_data
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}
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},
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[1] = {
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.type = AUTH_METHOD_NV_CTR,
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.param.nv_ctr = {
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.cert_nv_ctr = &trusted_nv_ctr,
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.plat_nv_ctr = &trusted_nv_ctr
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}
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}
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},
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.authenticated_data = (const auth_param_desc_t[COT_MAX_VERIFIED_PARAMS]) {
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[0] = {
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.type_desc = &tb_fw_hash,
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.data = {
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.ptr = (void *)tb_fw_hash_buf,
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.len = (unsigned int)HASH_DER_LEN
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}
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},
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[1] = {
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.type_desc = &tb_fw_config_hash,
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.data = {
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.ptr = (void *)tb_fw_config_hash_buf,
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.len = (unsigned int)HASH_DER_LEN
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}
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},
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[2] = {
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.type_desc = &hw_config_hash,
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.data = {
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.ptr = (void *)hw_config_hash_buf,
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.len = (unsigned int)HASH_DER_LEN
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}
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},
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[3] = {
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.type_desc = &fw_config_hash,
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.data = {
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.ptr = (void *)fw_config_hash_buf,
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.len = (unsigned int)HASH_DER_LEN
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}
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}
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}
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};
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/* HW Config */
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const auth_img_desc_t hw_config = {
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.img_id = HW_CONFIG_ID,
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.img_type = IMG_RAW,
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.parent = &trusted_boot_fw_cert,
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.img_auth_methods = (const auth_method_desc_t[AUTH_METHOD_NUM]) {
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[0] = {
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.type = AUTH_METHOD_HASH,
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.param.hash = {
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.data = &raw_data,
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.hash = &hw_config_hash
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}
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}
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}
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};
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