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// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright (c) 2017, Linaro Limited
*/
#include <kernel/pseudo_ta.h>
#include <tee/tadb.h>
#include <pta_secstor_ta_mgmt.h>
#include <signed_hdr.h>
#include <string_ext.h>
#include <string.h>
#include <tee_api_types.h>
#include <crypto/crypto.h>
#include <tee/uuid.h>
#include <types_ext.h>
#include <utee_defines.h>
static TEE_Result check_install_conflict(const struct shdr_bootstrap_ta *bs_ta)
{
TEE_Result res;
struct tee_tadb_ta_read *ta;
TEE_UUID uuid;
const struct tee_tadb_property *prop;
tee_uuid_from_octets(&uuid, bs_ta->uuid);
res = tee_tadb_ta_open(&uuid, &ta);
if (res == TEE_ERROR_ITEM_NOT_FOUND)
return TEE_SUCCESS;
if (res)
return res;
prop = tee_tadb_ta_get_property(ta);
if (prop->version > bs_ta->ta_version)
res = TEE_ERROR_ACCESS_CONFLICT;
tee_tadb_ta_close(ta);
return res;
}
static TEE_Result install_ta(struct shdr *shdr, const uint8_t *nw,
size_t nw_size)
{
TEE_Result res;
struct tee_tadb_ta_write *ta;
void *hash_ctx = NULL;
size_t offs;
const size_t buf_size = 2 * 4096;
void *buf;
struct tee_tadb_property property;
struct shdr_bootstrap_ta bs_ta;
if (shdr->img_type != SHDR_BOOTSTRAP_TA)
return TEE_ERROR_SECURITY;
if (nw_size < (sizeof(struct shdr_bootstrap_ta) + SHDR_GET_SIZE(shdr)))
return TEE_ERROR_SECURITY;
if (shdr->hash_size > buf_size)
return TEE_ERROR_SECURITY;
buf = malloc(buf_size);
if (!buf)
return TEE_ERROR_OUT_OF_MEMORY;
/*
* Initialize a hash context and run the algorithm over the signed
* header (less the final file hash and its signature of course)
*/
res = crypto_hash_alloc_ctx(&hash_ctx,
TEE_DIGEST_HASH_TO_ALGO(shdr->algo));
if (res)
goto err;
res = crypto_hash_init(hash_ctx);
if (res)
goto err_free_hash_ctx;
res = crypto_hash_update(hash_ctx, (uint8_t *)shdr, sizeof(*shdr));
if (res)
goto err_free_hash_ctx;
offs = SHDR_GET_SIZE(shdr);
memcpy(&bs_ta, nw + offs, sizeof(bs_ta));
/* Check that we're not downgrading a TA */
res = check_install_conflict(&bs_ta);
if (res)
goto err_free_hash_ctx;
res = crypto_hash_update(hash_ctx, (uint8_t *)&bs_ta, sizeof(bs_ta));
if (res)
goto err_free_hash_ctx;
offs += sizeof(bs_ta);
memset(&property, 0, sizeof(property));
COMPILE_TIME_ASSERT(sizeof(property.uuid) == sizeof(bs_ta.uuid));
tee_uuid_from_octets(&property.uuid, bs_ta.uuid);
property.version = bs_ta.ta_version;
property.custom_size = 0;
property.bin_size = nw_size - offs;
DMSG("Installing %pUl", (void *)&property.uuid);
res = tee_tadb_ta_create(&property, &ta);
if (res)
goto err_free_hash_ctx;
while (offs < nw_size) {
size_t l = MIN(buf_size, nw_size - offs);
memcpy(buf, nw + offs, l);
res = crypto_hash_update(hash_ctx, buf, l);
if (res)
goto err_ta_finalize;
res = tee_tadb_ta_write(ta, buf, l);
if (res)
goto err_ta_finalize;
offs += l;
}
res = crypto_hash_final(hash_ctx, buf, shdr->hash_size);
if (res)
goto err_ta_finalize;
if (consttime_memcmp(buf, SHDR_GET_HASH(shdr), shdr->hash_size)) {
res = TEE_ERROR_SECURITY;
goto err_ta_finalize;
}
crypto_hash_free_ctx(hash_ctx);
free(buf);
return tee_tadb_ta_close_and_commit(ta);
err_ta_finalize:
tee_tadb_ta_close_and_delete(ta);
err_free_hash_ctx:
crypto_hash_free_ctx(hash_ctx);
err:
free(buf);
return res;
}
static TEE_Result bootstrap(uint32_t param_types,
TEE_Param params[TEE_NUM_PARAMS])
{
TEE_Result res;
struct shdr *shdr;
const uint32_t exp_pt = TEE_PARAM_TYPES(TEE_PARAM_TYPE_MEMREF_INPUT,
TEE_PARAM_TYPE_NONE,
TEE_PARAM_TYPE_NONE,
TEE_PARAM_TYPE_NONE);
if (param_types != exp_pt)
return TEE_ERROR_BAD_PARAMETERS;
shdr = shdr_alloc_and_copy(params->memref.buffer, params->memref.size);
if (!shdr)
return TEE_ERROR_SECURITY;
res = shdr_verify_signature(shdr);
if (res)
goto out;
res = install_ta(shdr, params->memref.buffer, params->memref.size);
out:
shdr_free(shdr);
return res;
}
static TEE_Result invoke_command(void *sess_ctx __unused, uint32_t cmd_id,
uint32_t param_types,
TEE_Param params[TEE_NUM_PARAMS])
{
switch (cmd_id) {
case PTA_SECSTOR_TA_MGMT_BOOTSTRAP:
return bootstrap(param_types, params);
default:
break;
}
return TEE_ERROR_NOT_IMPLEMENTED;
}
pseudo_ta_register(.uuid = PTA_SECSTOR_TA_MGMT_UUID, .name = "secstor_ta_mgmt",
/*
* TA_FLAG_SINGLE_INSTANCE and TA_FLAG_MULTI_SESSION are
* current part of PTA_DEFAULT_FLAGS, but as this TA
* depends on those two flags we add them explicitly
* too.
*/
.flags = PTA_DEFAULT_FLAGS | TA_FLAG_SINGLE_INSTANCE |
TA_FLAG_MULTI_SESSION,
.invoke_command_entry_point = invoke_command);
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