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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/securerom/ROM.C $ */
/* */
/* OpenPOWER HostBoot Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2016,2017 */
/* [+] International Business Machines Corp. */
/* */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */
/* implied. See the License for the specific language governing */
/* permissions and limitations under the License. */
/* */
/* IBM_PROLOG_END_TAG */
#include <securerom/ROM.H>
#include <securerom/ecverify.H>
#include <securerom/status_codes.H>
#include <string.h>
#define valid_magic_number(header) \
(GET32((header)->magic_number) == ROM_MAGIC_NUMBER)
#define valid_container_version(header) \
(GET16((header)->version) == CONTAINER_VERSION)
static int valid_ver_alg(ROM_version_raw* ver_alg, uint8_t sig_alg)
{
if (GET16(ver_alg->version) != HEADER_VERSION)
{
return 0;
}
if (ver_alg->hash_alg != HASH_ALG_SHA512)
{
return 0;
}
if (!sig_alg)
{
return 1;
}
if (ver_alg->sig_alg != sig_alg)
{
return 0;
}
return 1;
}
static int valid_ecid(int ecid_count, uint8_t* ecids, uint8_t* hw_ecid)
{
if (ecid_count == 0)
{
return 1;
}
return 0;
}
static int multi_key_verify(uint8_t* digest, int key_count, uint8_t* keys,
uint8_t* sigs)
{
for (;key_count;key_count--,keys+=sizeof(ecc_key_t),
sigs+=sizeof(ecc_signature_t))
{
if (ec_verify (keys, digest, sigs)<1)
{
return 0;
}
}
return 1;
}
static inline ROM_container_raw* cast_container(uint64_t addr)
{
return (ROM_container_raw*) Convert_Mem_Addr(physical_addr(addr));
}
static inline void ROM_init_cache_area(uint64_t target, uint64_t size)
{
uint64_t i;
for (i=0;i<size;i+=CACHE_LINE)
{
assem_DCBZ(target);
target+=CACHE_LINE;
}
}
#undef CONTEXT
#define CONTEXT ROM_SRESET
#ifdef EMULATE_HW
void ROM_sreset (void)
{
#else
void ROM_sreset(void)
{
asm volatile (".globl rom_sreset\n rom_sreset:"); //skip prologue
#endif
// should never get here unless started too soon by fsp/sbe, checkstop
ERROR_STOP(EXECUTION_ERROR,"sreset");
}
#ifdef EMULATE_HW
#define FAILED(_c,_m) { params->log=ERROR_EVENT|CONTEXT|(_c); \
printf ("FAILED '%s'\n", (_m)); return ROM_FAILED; }
#else
#define FAILED(_c,_m) { params->log=ERROR_EVENT|CONTEXT|(_c); \
return ROM_FAILED; }
#endif
#undef CONTEXT
#define CONTEXT ROM_VERIFY
// NOTE: ROM_verify is called with with hrmor relative addresses from Hostboot
asm(".globl .L.ROM_verify");
ROM_response ROM_verify( ROM_container_raw* container,
ROM_hw_params* params )
{
SHA512_t digest;
ROM_prefix_header_raw* prefix;
ROM_prefix_data_raw* hw_data;
ROM_sw_header_raw* header;
ROM_sw_sig_raw* sw_sig;
uint64_t size;
params->log=CONTEXT|BEGIN;
// test for valid container magic number, version, hash & signature
// algorithms (sanity check)
if(!valid_magic_number(container))
FAILED(MAGIC_NUMBER_TEST,"bad container magic number");
if(!valid_container_version(container))
FAILED(CONTAINER_VERSION_TEST,"bad container version");
// process hw keys
// test for valid hw keys
SHA512_Hash(container->hw_pkey_a, HW_KEY_COUNT*sizeof(ecc_key_t), &digest);
if(memcmp(params->hw_key_hash, digest, sizeof(SHA512_t)))
{
FAILED(HW_KEY_HASH_TEST,"invalid hw keys");
}
// process prefix header
prefix = (ROM_prefix_header_raw*) &container->prefix;
// test for valid header version, hash & signature algorithms (sanity check)
if(!valid_ver_alg(&prefix->ver_alg, SIG_ALG_ECDSA521))
{
FAILED(PREFIX_VER_ALG_TEST,"bad prefix header version,alg's");
}
// test for valid prefix header signatures (all)
hw_data = (ROM_prefix_data_raw*) (prefix->ecid
+ prefix->ecid_count*ECID_SIZE);
SHA512_Hash((uint8_t*)prefix, PREFIX_HEADER_SIZE(prefix), &digest);
if(!multi_key_verify(digest, HW_KEY_COUNT, container->hw_pkey_a,
hw_data->hw_sig_a))
{
FAILED(HW_SIGNATURE_TEST,"invalid hw signature");
}
// test for machine specific matching ecid
if(!valid_ecid(prefix->ecid_count, prefix->ecid, params->my_ecid))
{
FAILED(PREFIX_ECID_TEST,"unauthorized prefix ecid");
}
// test for valid prefix payload hash
size = GET64(prefix->payload_size);
SHA512_Hash(hw_data->sw_pkey_p, size, &digest);
if(memcmp(prefix->payload_hash, digest, sizeof(SHA512_t)))
{
FAILED(PREFIX_HASH_TEST,"invalid prefix payload hash");
}
// test for valid sw key count
if (prefix->sw_key_count < SW_KEY_COUNT_MIN ||
prefix->sw_key_count > SW_KEY_COUNT_MAX)
{
FAILED(SW_KEY_INVALID_COUNT,"sw key count not between 1-3");
}
// finish proce`sing prefix header
// test for protection of all sw key material (sanity check)
if(size != (prefix->sw_key_count * sizeof(ecc_key_t)))
{
FAILED(SW_KEY_PROTECTION_TEST,"incomplete sw key protection in prefix header");
}
// start processing sw header
header = (ROM_sw_header_raw*) (hw_data->sw_pkey_p
+ prefix->sw_key_count*sizeof(ecc_key_t));
// test for valid header version, hash & signature algorithms (sanity check)
if(!valid_ver_alg(&header->ver_alg, 0))
{
FAILED(HEADER_VER_ALG_TEST,"bad sw header version,alg");
}
// test for valid sw header signatures (all)
sw_sig = (ROM_sw_sig_raw*) (header->ecid + header->ecid_count*ECID_SIZE);
SHA512_Hash((uint8_t*)header, SW_HEADER_SIZE(header), &digest);
if(!multi_key_verify(digest, prefix->sw_key_count, hw_data->sw_pkey_p,
sw_sig->sw_sig_p))
{
FAILED(SW_SIGNATURE_TEST,"invalid sw signature");
}
// test for machine specific matching ecid
if(!valid_ecid(header->ecid_count, header->ecid, params->my_ecid))
{
FAILED(HEADER_ECID_TEST,"unauthorized sw ecid");
}
// test for entry point within protected payload (sanity check)
params->entry_point = GET64(header->code_start_offset);
//check if the entry is HRMOR-relative and aligned
if(params->entry_point & ~(ENTRY_MASK))
{
FAILED(ENTRY_VALID_TEST,"entry is not HRMOR relative or not aligned");
}
size = GET64(header->payload_size);
// must have full instruction (3 more bytes)
if(params->entry_point+3 >= size)
{
FAILED(CODE_PROTECTION_TEST,"unprotected code_start in sw header");
}
// begin test for valid sw payload hash
SHA512_Hash((uint8_t*)container + 4096, size, &digest);
if(memcmp(header->payload_hash, digest, sizeof(SHA512_t)))
{
FAILED(HEADER_HASH_TEST,"invalid sw payload hash");
}
params->log=CONTEXT|COMPLETED;
return ROM_DONE;
}
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