tbbr/dualroot: Add fw_config image in chain of trust
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
diff --git a/drivers/auth/dualroot/cot.c b/drivers/auth/dualroot/cot.c
index f28ddaa..31e5d65 100644
--- a/drivers/auth/dualroot/cot.c
+++ b/drivers/auth/dualroot/cot.c
@@ -16,6 +16,7 @@
* Allocate static buffers to store the authentication parameters extracted from
* the certificates.
*/
+static unsigned char fw_config_hash_buf[HASH_DER_LEN];
static unsigned char tb_fw_hash_buf[HASH_DER_LEN];
static unsigned char tb_fw_config_hash_buf[HASH_DER_LEN];
static unsigned char hw_config_hash_buf[HASH_DER_LEN];
@@ -58,6 +59,8 @@
AUTH_PARAM_HASH, TRUSTED_BOOT_FW_CONFIG_HASH_OID);
static auth_param_type_desc_t hw_config_hash = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_HASH, HW_CONFIG_HASH_OID);
+static auth_param_type_desc_t fw_config_hash = AUTH_PARAM_TYPE_DESC(
+ AUTH_PARAM_HASH, FW_CONFIG_HASH_OID);
#ifdef IMAGE_BL1
static auth_param_type_desc_t scp_bl2u_hash = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_HASH, SCP_FWU_CFG_HASH_OID);
@@ -165,6 +168,13 @@
.ptr = (void *)hw_config_hash_buf,
.len = (unsigned int)HASH_DER_LEN
}
+ },
+ [3] = {
+ .type_desc = &fw_config_hash,
+ .data = {
+ .ptr = (void *)fw_config_hash_buf,
+ .len = (unsigned int)HASH_DER_LEN
+ }
}
}
};
@@ -218,6 +228,22 @@
}
}
};
+
+static const auth_img_desc_t fw_config = {
+ .img_id = FW_CONFIG_ID,
+ .img_type = IMG_RAW,
+ .parent = &trusted_boot_fw_cert,
+ .img_auth_methods = (const auth_method_desc_t[AUTH_METHOD_NUM]) {
+ [0] = {
+ .type = AUTH_METHOD_HASH,
+ .param.hash = {
+ .data = &raw_data,
+ .hash = &fw_config_hash
+ }
+ }
+ }
+};
+
#endif /* IMAGE_BL1 */
#ifdef IMAGE_BL2
@@ -860,6 +886,7 @@
[BL2_IMAGE_ID] = &bl2_image,
[HW_CONFIG_ID] = &hw_config,
[TB_FW_CONFIG_ID] = &tb_fw_config,
+ [FW_CONFIG_ID] = &fw_config,
[FWU_CERT_ID] = &fwu_cert,
[SCP_BL2U_IMAGE_ID] = &scp_bl2u_image,
[BL2U_IMAGE_ID] = &bl2u_image,
diff --git a/drivers/auth/tbbr/tbbr_cot_bl1.c b/drivers/auth/tbbr/tbbr_cot_bl1.c
index f3bb376..e4c9221 100644
--- a/drivers/auth/tbbr/tbbr_cot_bl1.c
+++ b/drivers/auth/tbbr/tbbr_cot_bl1.c
@@ -150,6 +150,21 @@
}
};
+static const auth_img_desc_t fw_config = {
+ .img_id = FW_CONFIG_ID,
+ .img_type = IMG_RAW,
+ .parent = &trusted_boot_fw_cert,
+ .img_auth_methods = (const auth_method_desc_t[AUTH_METHOD_NUM]) {
+ [0] = {
+ .type = AUTH_METHOD_HASH,
+ .param.hash = {
+ .data = &raw_data,
+ .hash = &fw_config_hash
+ }
+ }
+ }
+};
+
/*
* TBBR Chain of trust definition
*/
@@ -158,6 +173,7 @@
[BL2_IMAGE_ID] = &bl2_image,
[HW_CONFIG_ID] = &hw_config,
[TB_FW_CONFIG_ID] = &tb_fw_config,
+ [FW_CONFIG_ID] = &fw_config,
[FWU_CERT_ID] = &fwu_cert,
[SCP_BL2U_IMAGE_ID] = &scp_bl2u_image,
[BL2U_IMAGE_ID] = &bl2u_image,
diff --git a/drivers/auth/tbbr/tbbr_cot_common.c b/drivers/auth/tbbr/tbbr_cot_common.c
index 0a4b75e..ff3f22d 100644
--- a/drivers/auth/tbbr/tbbr_cot_common.c
+++ b/drivers/auth/tbbr/tbbr_cot_common.c
@@ -23,9 +23,10 @@
* established, we can reuse some of the buffers on different stages
*/
+static unsigned char fw_config_hash_buf[HASH_DER_LEN];
+static unsigned char tb_fw_config_hash_buf[HASH_DER_LEN];
+static unsigned char hw_config_hash_buf[HASH_DER_LEN];
unsigned char tb_fw_hash_buf[HASH_DER_LEN];
-unsigned char tb_fw_config_hash_buf[HASH_DER_LEN];
-unsigned char hw_config_hash_buf[HASH_DER_LEN];
unsigned char scp_fw_hash_buf[HASH_DER_LEN];
unsigned char nt_world_bl_hash_buf[HASH_DER_LEN];
@@ -48,7 +49,9 @@
AUTH_PARAM_HASH, TRUSTED_BOOT_FW_HASH_OID);
auth_param_type_desc_t tb_fw_config_hash = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_HASH, TRUSTED_BOOT_FW_CONFIG_HASH_OID);
-auth_param_type_desc_t hw_config_hash = AUTH_PARAM_TYPE_DESC(
+auth_param_type_desc_t fw_config_hash = AUTH_PARAM_TYPE_DESC(
+ AUTH_PARAM_HASH, FW_CONFIG_HASH_OID);
+static auth_param_type_desc_t hw_config_hash = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_HASH, HW_CONFIG_HASH_OID);
/* trusted_boot_fw_cert */
@@ -95,6 +98,13 @@
.ptr = (void *)hw_config_hash_buf,
.len = (unsigned int)HASH_DER_LEN
}
+ },
+ [3] = {
+ .type_desc = &fw_config_hash,
+ .data = {
+ .ptr = (void *)fw_config_hash_buf,
+ .len = (unsigned int)HASH_DER_LEN
+ }
}
}
};