/*
* Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of ARM nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <auth_mod.h>
#include <platform_def.h>
#include <platform_oid.h>
#include <stddef.h>
/*
* Maximum key and hash sizes (in DER format)
*/
#define PK_DER_LEN 294
#define HASH_DER_LEN 51
/*
* The platform must allocate buffers to store the authentication parameters
* extracted from the certificates. In this case, because of the way the CoT is
* established, we can reuse some of the buffers on different stages
*/
static unsigned char tb_fw_hash_buf[HASH_DER_LEN];
static unsigned char scp_fw_hash_buf[HASH_DER_LEN];
static unsigned char soc_fw_hash_buf[HASH_DER_LEN];
static unsigned char tos_fw_hash_buf[HASH_DER_LEN];
static unsigned char nt_world_bl_hash_buf[HASH_DER_LEN];
static unsigned char trusted_world_pk_buf[PK_DER_LEN];
static unsigned char non_trusted_world_pk_buf[PK_DER_LEN];
static unsigned char content_pk_buf[PK_DER_LEN];
/*
* Parameter type descriptors
*/
static auth_param_type_desc_t subject_pk = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_PUB_KEY, 0);
static auth_param_type_desc_t sig = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_SIG, 0);
static auth_param_type_desc_t sig_alg = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_SIG_ALG, 0);
static auth_param_type_desc_t raw_data = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_RAW_DATA, 0);
static auth_param_type_desc_t trusted_world_pk = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_PUB_KEY, TRUSTED_WORLD_PK_OID);
static auth_param_type_desc_t non_trusted_world_pk = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_PUB_KEY, NON_TRUSTED_WORLD_PK_OID);
static auth_param_type_desc_t scp_fw_content_pk = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_PUB_KEY, SCP_FW_CONTENT_CERT_PK_OID);
static auth_param_type_desc_t soc_fw_content_pk = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_PUB_KEY, SOC_FW_CONTENT_CERT_PK_OID);
static auth_param_type_desc_t tos_fw_content_pk = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_PUB_KEY, TRUSTED_OS_FW_CONTENT_CERT_PK_OID);
static auth_param_type_desc_t nt_fw_content_pk = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_PUB_KEY, NON_TRUSTED_FW_CONTENT_CERT_PK_OID);
static auth_param_type_desc_t tb_fw_hash = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_HASH, TRUSTED_BOOT_FW_HASH_OID);
static auth_param_type_desc_t scp_fw_hash = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_HASH, SCP_FW_HASH_OID);
static auth_param_type_desc_t soc_fw_hash = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_HASH, SOC_AP_FW_HASH_OID);
static auth_param_type_desc_t tos_fw_hash = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_HASH, TRUSTED_OS_FW_HASH_OID);
static auth_param_type_desc_t nt_world_bl_hash = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_HASH, NON_TRUSTED_WORLD_BOOTLOADER_HASH_OID);
static auth_param_type_desc_t scp_bl2u_hash = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_HASH, SCP_FWU_CFG_HASH_OID);
static auth_param_type_desc_t bl2u_hash = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_HASH, AP_FWU_CFG_HASH_OID);
static auth_param_type_desc_t ns_bl2u_hash = AUTH_PARAM_TYPE_DESC(
AUTH_PARAM_HASH, FWU_HASH_OID);
/*
* TBBR Chain of trust definition
*/
static const auth_img_desc_t cot_desc[] = {
/*
* BL2
*/
[TRUSTED_BOOT_FW_CERT_ID] = {
.img_id = TRUSTED_BOOT_FW_CERT_ID,
.img_type = IMG_CERT,
.parent = NULL,
.img_auth_methods = {
[0] = {
.type = AUTH_METHOD_SIG,
.param.sig = {
.pk = &subject_pk,
.sig = &sig,
.alg = &sig_alg,
.data = &raw_data,
}
}
},
.authenticated_data = {
[0] = {
.type_desc = &tb_fw_hash,
.data = {
.ptr = (void *)tb_fw_hash_buf,
.len = (unsigned int)HASH_DER_LEN
}
}
}
},
[BL2_IMAGE_ID] = {
.img_id = BL2_IMAGE_ID,
.img_type = IMG_RAW,
.parent = &cot_desc[TRUSTED_BOOT_FW_CERT_ID],
.img_auth_methods = {
[0] = {
.type = AUTH_METHOD_HASH,
.param.hash = {
.data = &raw_data,
.hash = &tb_fw_hash,
}
}
}
},
/*
* Trusted key certificate
*/
[TRUSTED_KEY_CERT_ID] = {
.img_id = TRUSTED_KEY_CERT_ID,
.img_type = IMG_CERT,
.parent = NULL,
.img_auth_methods = {
[0] = {
.type = AUTH_METHOD_SIG,
.param.sig = {
.pk = &subject_pk,
.sig = &sig,
.alg = &sig_alg,
.data = &raw_data,
}
}
},
.authenticated_data = {
[0] = {
.type_desc = &trusted_world_pk,
.data = {
.ptr = (void *)trusted_world_pk_buf,
.len = (unsigned int)PK_DER_LEN
}
},
[1] = {
.type_desc = &non_trusted_world_pk,
.data = {
.ptr = (void *)non_trusted_world_pk_buf,
.len = (unsigned int)PK_DER_LEN
}
}
}
},
/*
* SCP Firmware
*/
[SCP_FW_KEY_CERT_ID] = {
.img_id = SCP_FW_KEY_CERT_ID,
.img_type = IMG_CERT,
.parent = &cot_desc[TRUSTED_KEY_CERT_ID],
.img_auth_methods = {
[0] = {
.type = AUTH_METHOD_SIG,
.param.sig = {
.pk = &trusted_world_pk,
.sig = &sig,
.alg = &sig_alg,
.data = &raw_data,
}
}
},
.authenticated_data = {
[0] = {
.type_desc = &scp_fw_content_pk,
.data = {
.ptr = (void *)content_pk_buf,
.len = (unsigned int)PK_DER_LEN
}
}
}
},
[SCP_FW_CONTENT_CERT_ID] = {
.img_id = SCP_FW_CONTENT_CERT_ID,
.img_type = IMG_CERT,
.parent = &cot_desc[SCP_FW_KEY_CERT_ID],
.img_auth_methods = {
[0] = {
.type = AUTH_METHOD_SIG,
.param.sig = {
.pk = &scp_fw_content_pk,
.sig = &sig,
.alg = &sig_alg,
.data = &raw_data,
}
}
},
.authenticated_data = {
[0] = {
.type_desc = &scp_fw_hash,
.data = {
.ptr = (void *)scp_fw_hash_buf,
.len = (unsigned int)HASH_DER_LEN
}
}
}
},
[SCP_BL2_IMAGE_ID] = {
.img_id = SCP_BL2_IMAGE_ID,
.img_type = IMG_RAW,
.parent = &cot_desc[SCP_FW_CONTENT_CERT_ID],
.img_auth_methods = {
[0] = {
.type = AUTH_METHOD_HASH,
.param.hash = {
.data = &raw_data,
.hash = &scp_fw_hash,
}
}
}
},
/*
* SoC Firmware
*/
[SOC_FW_KEY_CERT_ID] = {
.img_id = SOC_FW_KEY_CERT_ID,
.img_type = IMG_CERT,
.parent = &cot_desc[TRUSTED_KEY_CERT_ID],
.img_auth_methods = {
[0] = {
.type = AUTH_METHOD_SIG,
.param.sig = {
.pk = &trusted_world_pk,
.sig = &sig,
.alg = &sig_alg,
.data = &raw_data,
}
}
},
.authenticated_data = {
[0] = {
.type_desc = &soc_fw_content_pk,
.data = {
.ptr = (void *)content_pk_buf,
.len = (unsigned int)PK_DER_LEN
}
}
}
},
[SOC_FW_CONTENT_CERT_ID] = {
.img_id = SOC_FW_CONTENT_CERT_ID,
.img_type = IMG_CERT,
.parent = &cot_desc[SOC_FW_KEY_CERT_ID],
.img_auth_methods = {
[0] = {
.type = AUTH_METHOD_SIG,
.param.sig = {
.pk = &soc_fw_content_pk,
.sig = &sig,
.alg = &sig_alg,
.data = &raw_data,
}
}
},
.authenticated_data = {
[0] = {
.type_desc = &soc_fw_hash,
.data = {
.ptr = (void *)soc_fw_hash_buf,
.len = (unsigned int)HASH_DER_LEN
}
}
}
},
[BL31_IMAGE_ID] = {
.img_id = BL31_IMAGE_ID,
.img_type = IMG_RAW,
.parent = &cot_desc[SOC_FW_CONTENT_CERT_ID],
.img_auth_methods = {
[0] = {
.type = AUTH_METHOD_HASH,
.param.hash = {
.data = &raw_data,
.hash = &soc_fw_hash,
}
}
}
},
/*
* Trusted OS Firmware
*/
[TRUSTED_OS_FW_KEY_CERT_ID] = {
.img_id = TRUSTED_OS_FW_KEY_CERT_ID,
.img_type = IMG_CERT,
.parent = &cot_desc[TRUSTED_KEY_CERT_ID],
.img_auth_methods = {
[0] = {
.type = AUTH_METHOD_SIG,
.param.sig = {
.pk = &trusted_world_pk,
.sig = &sig,
.alg = &sig_alg,
.data = &raw_data,
}
}
},
.authenticated_data = {
[0] = {
.type_desc = &tos_fw_content_pk,
.data = {
.ptr = (void *)content_pk_buf,
.len = (unsigned int)PK_DER_LEN
}
}
}
},
[TRUSTED_OS_FW_CONTENT_CERT_ID] = {
.img_id = TRUSTED_OS_FW_CONTENT_CERT_ID,
.img_type = IMG_CERT,
.parent = &cot_desc[TRUSTED_OS_FW_KEY_CERT_ID],
.img_auth_methods = {
[0] = {
.type = AUTH_METHOD_SIG,
.param.sig = {
.pk = &tos_fw_content_pk,
.sig = &sig,
.alg = &sig_alg,
.data = &raw_data,
}
}
},
.authenticated_data = {
[0] = {
.type_desc = &tos_fw_hash,
.data = {
.ptr = (void *)tos_fw_hash_buf,
.len = (unsigned int)HASH_DER_LEN
}
}
}
},
[BL32_IMAGE_ID] = {
.img_id = BL32_IMAGE_ID,
.img_type = IMG_RAW,
.parent = &cot_desc[TRUSTED_OS_FW_CONTENT_CERT_ID],
.img_auth_methods = {
[0] = {
.type = AUTH_METHOD_HASH,
.param.hash = {
.data = &raw_data,
.hash = &tos_fw_hash,
}
}
}
},
/*
* Non-Trusted Firmware
*/
[NON_TRUSTED_FW_KEY_CERT_ID] = {
.img_id = NON_TRUSTED_FW_KEY_CERT_ID,
.img_type = IMG_CERT,
.parent = &cot_desc[TRUSTED_KEY_CERT_ID],
.img_auth_methods = {
[0] = {
.type = AUTH_METHOD_SIG,
.param.sig = {
.pk = &non_trusted_world_pk,
.sig = &sig,
.alg = &sig_alg,
.data = &raw_data,
}
}
},
.authenticated_data = {
[0] = {
.type_desc = &nt_fw_content_pk,
.data = {
.ptr = (void *)content_pk_buf,
.len = (unsigned int)PK_DER_LEN
}
}
}
},
[NON_TRUSTED_FW_CONTENT_CERT_ID] = {
.img_id = NON_TRUSTED_FW_CONTENT_CERT_ID,
.img_type = IMG_CERT,
.parent = &cot_desc[NON_TRUSTED_FW_KEY_CERT_ID],
.img_auth_methods = {
[0] = {
.type = AUTH_METHOD_SIG,
.param.sig = {
.pk = &nt_fw_content_pk,
.sig = &sig,
.alg = &sig_alg,
.data = &raw_data,
}
}
},
.authenticated_data = {
[0] = {
.type_desc = &nt_world_bl_hash,
.data = {
.ptr = (void *)nt_world_bl_hash_buf,
.len = (unsigned int)HASH_DER_LEN
}
}
}
},
[BL33_IMAGE_ID] = {
.img_id = BL33_IMAGE_ID,
.img_type = IMG_RAW,
.parent = &cot_desc[NON_TRUSTED_FW_CONTENT_CERT_ID],
.img_auth_methods = {
[0] = {
.type = AUTH_METHOD_HASH,
.param.hash = {
.data = &raw_data,
.hash = &nt_world_bl_hash,
}
}
}
},
/*
* FWU auth descriptor.
*/
[FWU_CERT_ID] = {
.img_id = FWU_CERT_ID,
.img_type = IMG_CERT,
.parent = NULL,
.img_auth_methods = {
[0] = {
.type = AUTH_METHOD_SIG,
.param.sig = {
.pk = &subject_pk,
.sig = &sig,
.alg = &sig_alg,
.data = &raw_data,
}
}
},
.authenticated_data = {
[0] = {
.type_desc = &scp_bl2u_hash,
.data = {
.ptr = (void *)scp_fw_hash_buf,
.len = (unsigned int)HASH_DER_LEN
}
},
[1] = {
.type_desc = &bl2u_hash,
.data = {
.ptr = (void *)tb_fw_hash_buf,
.len = (unsigned int)HASH_DER_LEN
}
},
[2] = {
.type_desc = &ns_bl2u_hash,
.data = {
.ptr = (void *)nt_world_bl_hash_buf,
.len = (unsigned int)HASH_DER_LEN
}
}
}
},
/*
* SCP_BL2U
*/
[SCP_BL2U_IMAGE_ID] = {
.img_id = SCP_BL2U_IMAGE_ID,
.img_type = IMG_RAW,
.parent = &cot_desc[FWU_CERT_ID],
.img_auth_methods = {
[0] = {
.type = AUTH_METHOD_HASH,
.param.hash = {
.data = &raw_data,
.hash = &scp_bl2u_hash,
}
}
}
},
/*
* BL2U
*/
[BL2U_IMAGE_ID] = {
.img_id = BL2U_IMAGE_ID,
.img_type = IMG_RAW,
.parent = &cot_desc[FWU_CERT_ID],
.img_auth_methods = {
[0] = {
.type = AUTH_METHOD_HASH,
.param.hash = {
.data = &raw_data,
.hash = &bl2u_hash,
}
}
}
},
/*
* NS_BL2U
*/
[NS_BL2U_IMAGE_ID] = {
.img_id = NS_BL2U_IMAGE_ID,
.img_type = IMG_RAW,
.parent = &cot_desc[FWU_CERT_ID],
.img_auth_methods = {
[0] = {
.type = AUTH_METHOD_HASH,
.param.hash = {
.data = &raw_data,
.hash = &ns_bl2u_hash,
}
}
}
}
};
/* Register the CoT in the authentication module */
REGISTER_COT(cot_desc);
