570 lines
18 KiB
C
570 lines
18 KiB
C
/*
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* PSA crypto layer on top of Mbed TLS crypto
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*/
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/*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "common.h"
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#if defined(MBEDTLS_PSA_CRYPTO_C)
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#include "psa/crypto.h"
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#include "psa_crypto_core.h"
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#include "psa_crypto_driver_wrappers.h"
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#include "psa_crypto_slot_management.h"
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#include "psa_crypto_storage.h"
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#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
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#include "psa_crypto_se.h"
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#endif
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#include <stdlib.h>
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#include <string.h>
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#define mbedtls_calloc calloc
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#define mbedtls_free free
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#endif
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#define ARRAY_LENGTH( array ) ( sizeof( array ) / sizeof( *( array ) ) )
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typedef struct
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{
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psa_key_slot_t key_slots[MBEDTLS_PSA_KEY_SLOT_COUNT];
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unsigned key_slots_initialized : 1;
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} psa_global_data_t;
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static psa_global_data_t global_data;
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int psa_is_valid_key_id( mbedtls_svc_key_id_t key, int vendor_ok )
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{
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psa_key_id_t key_id = MBEDTLS_SVC_KEY_ID_GET_KEY_ID( key );
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if( ( PSA_KEY_ID_USER_MIN <= key_id ) &&
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( key_id <= PSA_KEY_ID_USER_MAX ) )
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return( 1 );
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if( vendor_ok &&
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( PSA_KEY_ID_VENDOR_MIN <= key_id ) &&
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( key_id <= PSA_KEY_ID_VENDOR_MAX ) )
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return( 1 );
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return( 0 );
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}
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/** Get the description in memory of a key given its identifier and lock it.
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*
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* The descriptions of volatile keys and loaded persistent keys are
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* stored in key slots. This function returns a pointer to the key slot
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* containing the description of a key given its identifier.
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*
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* The function searches the key slots containing the description of the key
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* with \p key identifier. The function does only read accesses to the key
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* slots. The function does not load any persistent key thus does not access
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* any storage.
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*
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* For volatile key identifiers, only one key slot is queried as a volatile
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* key with identifier key_id can only be stored in slot of index
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* ( key_id - #PSA_KEY_ID_VOLATILE_MIN ).
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*
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* On success, the function locks the key slot. It is the responsibility of
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* the caller to unlock the key slot when it does not access it anymore.
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*
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* \param key Key identifier to query.
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* \param[out] p_slot On success, `*p_slot` contains a pointer to the
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* key slot containing the description of the key
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* identified by \p key.
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*
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* \retval #PSA_SUCCESS
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* The pointer to the key slot containing the description of the key
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* identified by \p key was returned.
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* \retval #PSA_ERROR_INVALID_HANDLE
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* \p key is not a valid key identifier.
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* \retval #PSA_ERROR_DOES_NOT_EXIST
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* There is no key with key identifier \p key in the key slots.
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*/
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static psa_status_t psa_get_and_lock_key_slot_in_memory(
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mbedtls_svc_key_id_t key, psa_key_slot_t **p_slot )
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{
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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psa_key_id_t key_id = MBEDTLS_SVC_KEY_ID_GET_KEY_ID( key );
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size_t slot_idx;
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psa_key_slot_t *slot = NULL;
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if( psa_key_id_is_volatile( key_id ) )
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{
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slot = &global_data.key_slots[ key_id - PSA_KEY_ID_VOLATILE_MIN ];
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/*
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* Check if both the PSA key identifier key_id and the owner
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* identifier of key match those of the key slot.
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*
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* Note that, if the key slot is not occupied, its PSA key identifier
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* is equal to zero. This is an invalid value for a PSA key identifier
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* and thus cannot be equal to the valid PSA key identifier key_id.
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*/
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status = mbedtls_svc_key_id_equal( key, slot->attr.id ) ?
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PSA_SUCCESS : PSA_ERROR_DOES_NOT_EXIST;
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}
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else
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{
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if ( !psa_is_valid_key_id( key, 1 ) )
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return( PSA_ERROR_INVALID_HANDLE );
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for( slot_idx = 0; slot_idx < MBEDTLS_PSA_KEY_SLOT_COUNT; slot_idx++ )
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{
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slot = &global_data.key_slots[ slot_idx ];
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if( mbedtls_svc_key_id_equal( key, slot->attr.id ) )
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break;
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}
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status = ( slot_idx < MBEDTLS_PSA_KEY_SLOT_COUNT ) ?
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PSA_SUCCESS : PSA_ERROR_DOES_NOT_EXIST;
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}
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if( status == PSA_SUCCESS )
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{
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status = psa_lock_key_slot( slot );
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if( status == PSA_SUCCESS )
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*p_slot = slot;
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}
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return( status );
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}
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psa_status_t psa_initialize_key_slots( void )
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{
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/* Nothing to do: program startup and psa_wipe_all_key_slots() both
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* guarantee that the key slots are initialized to all-zero, which
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* means that all the key slots are in a valid, empty state. */
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global_data.key_slots_initialized = 1;
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return( PSA_SUCCESS );
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}
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void psa_wipe_all_key_slots( void )
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{
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size_t slot_idx;
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for( slot_idx = 0; slot_idx < MBEDTLS_PSA_KEY_SLOT_COUNT; slot_idx++ )
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{
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psa_key_slot_t *slot = &global_data.key_slots[ slot_idx ];
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slot->lock_count = 1;
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(void) psa_wipe_key_slot( slot );
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}
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global_data.key_slots_initialized = 0;
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}
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psa_status_t psa_get_empty_key_slot( psa_key_id_t *volatile_key_id,
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psa_key_slot_t **p_slot )
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{
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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size_t slot_idx;
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psa_key_slot_t *selected_slot, *unlocked_persistent_key_slot;
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if( ! global_data.key_slots_initialized )
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{
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status = PSA_ERROR_BAD_STATE;
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goto error;
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}
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selected_slot = unlocked_persistent_key_slot = NULL;
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for( slot_idx = 0; slot_idx < MBEDTLS_PSA_KEY_SLOT_COUNT; slot_idx++ )
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{
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psa_key_slot_t *slot = &global_data.key_slots[ slot_idx ];
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if( ! psa_is_key_slot_occupied( slot ) )
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{
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selected_slot = slot;
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break;
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}
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if( ( unlocked_persistent_key_slot == NULL ) &&
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( ! PSA_KEY_LIFETIME_IS_VOLATILE( slot->attr.lifetime ) ) &&
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( ! psa_is_key_slot_locked( slot ) ) )
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unlocked_persistent_key_slot = slot;
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}
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/*
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* If there is no unused key slot and there is at least one unlocked key
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* slot containing the description of a persistent key, recycle the first
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* such key slot we encountered. If we later need to operate on the
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* persistent key we are evicting now, we will reload its description from
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* storage.
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*/
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if( ( selected_slot == NULL ) &&
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( unlocked_persistent_key_slot != NULL ) )
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{
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selected_slot = unlocked_persistent_key_slot;
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selected_slot->lock_count = 1;
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psa_wipe_key_slot( selected_slot );
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}
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if( selected_slot != NULL )
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{
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status = psa_lock_key_slot( selected_slot );
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if( status != PSA_SUCCESS )
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goto error;
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*volatile_key_id = PSA_KEY_ID_VOLATILE_MIN +
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( (psa_key_id_t)( selected_slot - global_data.key_slots ) );
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*p_slot = selected_slot;
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return( PSA_SUCCESS );
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}
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status = PSA_ERROR_INSUFFICIENT_MEMORY;
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error:
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*p_slot = NULL;
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*volatile_key_id = 0;
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return( status );
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}
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#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
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static psa_status_t psa_load_persistent_key_into_slot( psa_key_slot_t *slot )
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{
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psa_status_t status = PSA_SUCCESS;
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uint8_t *key_data = NULL;
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size_t key_data_length = 0;
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status = psa_load_persistent_key( &slot->attr,
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&key_data, &key_data_length );
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if( status != PSA_SUCCESS )
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goto exit;
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#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
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/* Special handling is required for loading keys associated with a
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* dynamically registered SE interface. */
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const psa_drv_se_t *drv;
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psa_drv_se_context_t *drv_context;
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if( psa_get_se_driver( slot->attr.lifetime, &drv, &drv_context ) )
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{
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psa_se_key_data_storage_t *data;
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if( key_data_length != sizeof( *data ) )
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{
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status = PSA_ERROR_DATA_INVALID;
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goto exit;
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}
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data = (psa_se_key_data_storage_t *) key_data;
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status = psa_copy_key_material_into_slot(
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slot, data->slot_number, sizeof( data->slot_number ) );
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goto exit;
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}
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#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
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status = psa_copy_key_material_into_slot( slot, key_data, key_data_length );
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exit:
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psa_free_persistent_key_data( key_data, key_data_length );
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return( status );
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}
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#endif /* MBEDTLS_PSA_CRYPTO_STORAGE_C */
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#if defined(MBEDTLS_PSA_CRYPTO_BUILTIN_KEYS)
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static psa_status_t psa_load_builtin_key_into_slot( psa_key_slot_t *slot )
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{
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
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psa_key_lifetime_t lifetime = PSA_KEY_LIFETIME_VOLATILE;
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psa_drv_slot_number_t slot_number = 0;
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size_t key_buffer_size = 0;
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size_t key_buffer_length = 0;
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if( ! psa_key_id_is_builtin(
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MBEDTLS_SVC_KEY_ID_GET_KEY_ID( slot->attr.id ) ) )
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{
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return( PSA_ERROR_DOES_NOT_EXIST );
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}
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/* Check the platform function to see whether this key actually exists */
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status = mbedtls_psa_platform_get_builtin_key(
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slot->attr.id, &lifetime, &slot_number );
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if( status != PSA_SUCCESS )
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return( status );
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/* Set required key attributes to ensure get_builtin_key can retrieve the
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* full attributes. */
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psa_set_key_id( &attributes, slot->attr.id );
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psa_set_key_lifetime( &attributes, lifetime );
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/* Get the full key attributes from the driver in order to be able to
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* calculate the required buffer size. */
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status = psa_driver_wrapper_get_builtin_key(
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slot_number, &attributes,
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NULL, 0, NULL );
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if( status != PSA_ERROR_BUFFER_TOO_SMALL )
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{
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/* Builtin keys cannot be defined by the attributes alone */
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if( status == PSA_SUCCESS )
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status = PSA_ERROR_CORRUPTION_DETECTED;
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return( status );
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}
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/* If the key should exist according to the platform, then ask the driver
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* what its expected size is. */
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status = psa_driver_wrapper_get_key_buffer_size( &attributes,
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&key_buffer_size );
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if( status != PSA_SUCCESS )
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return( status );
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/* Allocate a buffer of the required size and load the builtin key directly
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* into the (now properly sized) slot buffer. */
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status = psa_allocate_buffer_to_slot( slot, key_buffer_size );
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if( status != PSA_SUCCESS )
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return( status );
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status = psa_driver_wrapper_get_builtin_key(
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slot_number, &attributes,
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slot->key.data, slot->key.bytes, &key_buffer_length );
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if( status != PSA_SUCCESS )
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goto exit;
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/* Copy actual key length and core attributes into the slot on success */
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slot->key.bytes = key_buffer_length;
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slot->attr = attributes.core;
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exit:
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if( status != PSA_SUCCESS )
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psa_remove_key_data_from_memory( slot );
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return( status );
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}
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#endif /* MBEDTLS_PSA_CRYPTO_BUILTIN_KEYS */
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psa_status_t psa_get_and_lock_key_slot( mbedtls_svc_key_id_t key,
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psa_key_slot_t **p_slot )
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{
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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*p_slot = NULL;
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if( ! global_data.key_slots_initialized )
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return( PSA_ERROR_BAD_STATE );
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/*
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* On success, the pointer to the slot is passed directly to the caller
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* thus no need to unlock the key slot here.
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*/
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status = psa_get_and_lock_key_slot_in_memory( key, p_slot );
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if( status != PSA_ERROR_DOES_NOT_EXIST )
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return( status );
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/* Loading keys from storage requires support for such a mechanism */
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#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C) || \
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defined(MBEDTLS_PSA_CRYPTO_BUILTIN_KEYS)
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psa_key_id_t volatile_key_id;
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status = psa_get_empty_key_slot( &volatile_key_id, p_slot );
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if( status != PSA_SUCCESS )
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return( status );
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(*p_slot)->attr.id = key;
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(*p_slot)->attr.lifetime = PSA_KEY_LIFETIME_PERSISTENT;
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status = PSA_ERROR_DOES_NOT_EXIST;
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#if defined(MBEDTLS_PSA_CRYPTO_BUILTIN_KEYS)
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/* Load keys in the 'builtin' range through their own interface */
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status = psa_load_builtin_key_into_slot( *p_slot );
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#endif /* MBEDTLS_PSA_CRYPTO_BUILTIN_KEYS */
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#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
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if( status == PSA_ERROR_DOES_NOT_EXIST )
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status = psa_load_persistent_key_into_slot( *p_slot );
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#endif /* defined(MBEDTLS_PSA_CRYPTO_STORAGE_C) */
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if( status != PSA_SUCCESS )
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{
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psa_wipe_key_slot( *p_slot );
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if( status == PSA_ERROR_DOES_NOT_EXIST )
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status = PSA_ERROR_INVALID_HANDLE;
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}
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return( status );
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#else /* MBEDTLS_PSA_CRYPTO_STORAGE_C || MBEDTLS_PSA_CRYPTO_BUILTIN_KEYS */
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return( PSA_ERROR_INVALID_HANDLE );
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#endif /* MBEDTLS_PSA_CRYPTO_STORAGE_C || MBEDTLS_PSA_CRYPTO_BUILTIN_KEYS */
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}
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psa_status_t psa_unlock_key_slot( psa_key_slot_t *slot )
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{
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if( slot == NULL )
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return( PSA_SUCCESS );
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if( slot->lock_count > 0 )
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{
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slot->lock_count--;
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return( PSA_SUCCESS );
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}
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return( PSA_ERROR_CORRUPTION_DETECTED );
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}
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psa_status_t psa_validate_key_location( psa_key_lifetime_t lifetime,
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psa_se_drv_table_entry_t **p_drv )
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{
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if ( psa_key_lifetime_is_external( lifetime ) )
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{
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#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
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/* Check whether a driver is registered against this lifetime */
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psa_se_drv_table_entry_t *driver = psa_get_se_driver_entry( lifetime );
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if( driver != NULL )
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{
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if (p_drv != NULL)
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*p_drv = driver;
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return( PSA_SUCCESS );
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}
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#else /* MBEDTLS_PSA_CRYPTO_SE_C */
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(void) p_drv;
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#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
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#if defined(MBEDTLS_PSA_CRYPTO_DRIVERS)
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/* Key location for external keys gets checked by the wrapper */
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return( PSA_SUCCESS );
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#else /* MBEDTLS_PSA_CRYPTO_DRIVERS */
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/* No support for external lifetimes at all, or dynamic interface
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* did not find driver for requested lifetime. */
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return( PSA_ERROR_INVALID_ARGUMENT );
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#endif /* MBEDTLS_PSA_CRYPTO_DRIVERS */
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}
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else
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/* Local/internal keys are always valid */
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return( PSA_SUCCESS );
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}
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psa_status_t psa_validate_key_persistence( psa_key_lifetime_t lifetime )
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{
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if ( PSA_KEY_LIFETIME_IS_VOLATILE( lifetime ) )
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{
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/* Volatile keys are always supported */
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return( PSA_SUCCESS );
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}
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else
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{
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/* Persistent keys require storage support */
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#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
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if( PSA_KEY_LIFETIME_IS_READ_ONLY( lifetime ) )
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return( PSA_ERROR_INVALID_ARGUMENT );
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else
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return( PSA_SUCCESS );
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#else /* MBEDTLS_PSA_CRYPTO_STORAGE_C */
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return( PSA_ERROR_NOT_SUPPORTED );
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#endif /* !MBEDTLS_PSA_CRYPTO_STORAGE_C */
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}
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}
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psa_status_t psa_open_key( mbedtls_svc_key_id_t key, psa_key_handle_t *handle )
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{
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#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
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psa_status_t status;
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psa_key_slot_t *slot;
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|
status = psa_get_and_lock_key_slot( key, &slot );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
*handle = PSA_KEY_HANDLE_INIT;
|
|
if( status == PSA_ERROR_INVALID_HANDLE )
|
|
status = PSA_ERROR_DOES_NOT_EXIST;
|
|
|
|
return( status );
|
|
}
|
|
|
|
*handle = key;
|
|
|
|
return( psa_unlock_key_slot( slot ) );
|
|
|
|
#else /* defined(MBEDTLS_PSA_CRYPTO_STORAGE_C) */
|
|
(void) key;
|
|
*handle = PSA_KEY_HANDLE_INIT;
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
#endif /* !defined(MBEDTLS_PSA_CRYPTO_STORAGE_C) */
|
|
}
|
|
|
|
psa_status_t psa_close_key( psa_key_handle_t handle )
|
|
{
|
|
psa_status_t status;
|
|
psa_key_slot_t *slot;
|
|
|
|
if( psa_key_handle_is_null( handle ) )
|
|
return( PSA_SUCCESS );
|
|
|
|
status = psa_get_and_lock_key_slot_in_memory( handle, &slot );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
if( status == PSA_ERROR_DOES_NOT_EXIST )
|
|
status = PSA_ERROR_INVALID_HANDLE;
|
|
|
|
return( status );
|
|
}
|
|
if( slot->lock_count <= 1 )
|
|
return( psa_wipe_key_slot( slot ) );
|
|
else
|
|
return( psa_unlock_key_slot( slot ) );
|
|
}
|
|
|
|
psa_status_t psa_purge_key( mbedtls_svc_key_id_t key )
|
|
{
|
|
psa_status_t status;
|
|
psa_key_slot_t *slot;
|
|
|
|
status = psa_get_and_lock_key_slot_in_memory( key, &slot );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
|
|
if( ( ! PSA_KEY_LIFETIME_IS_VOLATILE( slot->attr.lifetime ) ) &&
|
|
( slot->lock_count <= 1 ) )
|
|
return( psa_wipe_key_slot( slot ) );
|
|
else
|
|
return( psa_unlock_key_slot( slot ) );
|
|
}
|
|
|
|
void mbedtls_psa_get_stats( mbedtls_psa_stats_t *stats )
|
|
{
|
|
size_t slot_idx;
|
|
|
|
memset( stats, 0, sizeof( *stats ) );
|
|
|
|
for( slot_idx = 0; slot_idx < MBEDTLS_PSA_KEY_SLOT_COUNT; slot_idx++ )
|
|
{
|
|
const psa_key_slot_t *slot = &global_data.key_slots[ slot_idx ];
|
|
if( psa_is_key_slot_locked( slot ) )
|
|
{
|
|
++stats->locked_slots;
|
|
}
|
|
if( ! psa_is_key_slot_occupied( slot ) )
|
|
{
|
|
++stats->empty_slots;
|
|
continue;
|
|
}
|
|
if( PSA_KEY_LIFETIME_IS_VOLATILE( slot->attr.lifetime ) )
|
|
++stats->volatile_slots;
|
|
else
|
|
{
|
|
psa_key_id_t id = MBEDTLS_SVC_KEY_ID_GET_KEY_ID( slot->attr.id );
|
|
++stats->persistent_slots;
|
|
if( id > stats->max_open_internal_key_id )
|
|
stats->max_open_internal_key_id = id;
|
|
}
|
|
if( PSA_KEY_LIFETIME_GET_LOCATION( slot->attr.lifetime ) !=
|
|
PSA_KEY_LOCATION_LOCAL_STORAGE )
|
|
{
|
|
psa_key_id_t id = MBEDTLS_SVC_KEY_ID_GET_KEY_ID( slot->attr.id );
|
|
++stats->external_slots;
|
|
if( id > stats->max_open_external_key_id )
|
|
stats->max_open_external_key_id = id;
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif /* MBEDTLS_PSA_CRYPTO_C */
|