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Support encoding an owner in key file IDs

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Differentiate between _key identifiers_, which are always `uint32_t`,
and _key file identifiers_, which are platform-dependent. Normally,
the two are the same.

In `psa/crypto_platform.h`, define `psa_app_key_id_t` (which is always
32 bits, the standard key identifier type) and
`psa_key_file_id_t` (which will be different in some service builds).
A subsequent commit will introduce a platform where the two are different.

It would make sense for the function declarations in `psa/crypto.h` to
use `psa_key_file_id_t`. However this file is currently part of the
PSA Crypto API specification, so it must stick to the standard type
`psa_key_id_t`. Hence, as long as the specification and Mbed Crypto
are not separate, use the implementation-specific file
`psa/crypto_platform.h` to define `psa_key_id_t` as `psa_key_file_id_t`.

In the library, systematically use `psa_key_file_id_t`.

    perl -i -pe 's/psa_key_id_t/psa_key_file_id_t/g' library/*.[hc]
This commit is contained in:
Gilles Peskine 2019-02-19 13:24:37 +01:00
parent e988a66b5b
commit 5b229a06f4
8 changed files with 53 additions and 29 deletions
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23
include/psa/crypto_platform.h
View file

@ -49,4 +49,27 @@
/* Integral type representing a key handle. */
typedef uint16_t psa_key_handle_t;
/* This implementation distinguishes *application key identifiers*, which
* are the key identifiers specified by the application, from
* *key file identifiers*, which are the key identifiers that the library
* sees internally. The two types can be different if there is a remote
* call layer between the application and the library which supports
* multiple client applications that do not have access to each others'
* keys. The point of having different types is that the key file
* identifier may encode not only the key identifier specified by the
* application, but also the the identity of the application.
*
* Note that this is an internal concept of the library and the remote
* call layer. The application itself never sees anything other than
* #psa_app_key_id_t with its standard definition.
*/
/* The application key identifier is always what the application sees as
* #psa_key_id_t. */
typedef uint32_t psa_app_key_id_t;
/* By default, a key file identifier is just the application key identifier. */
typedef psa_app_key_id_t psa_key_file_id_t;
#define PSA_KEY_FILE_GET_KEY_ID( id ) ( id )
#endif /* PSA_CRYPTO_PLATFORM_H */

2
library/psa_crypto_core.h
View file

@ -41,7 +41,7 @@ typedef struct
psa_key_type_t type;
psa_key_policy_t policy;
psa_key_lifetime_t lifetime;
psa_key_id_t persistent_storage_id;
psa_key_file_id_t persistent_storage_id;
unsigned allocated : 1;
union
{

15
library/psa_crypto_slot_management.c
View file

@ -189,12 +189,13 @@ exit:
* past released version must remain valid, unless a migration path
* is provided.
*
* \param key_id The key identifier to check.
* \param file_id The key identifier to check.
*
* \return 1 if \p key_id is acceptable, otherwise 0.
* \return 1 if \p file_id is acceptable, otherwise 0.
*/
static int psa_is_key_id_valid( psa_key_id_t key_id )
static int psa_is_key_id_valid( psa_key_file_id_t file_id )
{
psa_app_key_id_t key_id = PSA_KEY_FILE_GET_KEY_ID( file_id );
/* Reject id=0 because by general library conventions, 0 is an invalid
* value wherever possible. */
if( key_id == 0 )
@ -226,7 +227,7 @@ static int psa_is_key_id_valid( psa_key_id_t key_id )
* \retval #PSA_ERROR_STORAGE_FAILURE
*/
static psa_status_t psa_internal_make_key_persistent( psa_key_handle_t handle,
psa_key_id_t id )
psa_key_file_id_t id )
{
#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
psa_key_slot_t *slot;
@ -253,7 +254,7 @@ static psa_status_t psa_internal_make_key_persistent( psa_key_handle_t handle,
}
static psa_status_t persistent_key_setup( psa_key_lifetime_t lifetime,
psa_key_id_t id,
psa_key_file_id_t id,
psa_key_handle_t *handle,
psa_status_t wanted_load_status )
{
@ -278,14 +279,14 @@ static psa_status_t persistent_key_setup( psa_key_lifetime_t lifetime,
}
psa_status_t psa_open_key( psa_key_lifetime_t lifetime,
psa_key_id_t id,
psa_key_file_id_t id,
psa_key_handle_t *handle )
{
return( persistent_key_setup( lifetime, id, handle, PSA_SUCCESS ) );
}
psa_status_t psa_create_key( psa_key_lifetime_t lifetime,
psa_key_id_t id,
psa_key_file_id_t id,
psa_key_handle_t *handle )
{
psa_status_t status;

4
library/psa_crypto_storage.c
View file

@ -148,7 +148,7 @@ psa_status_t psa_parse_key_data_from_storage( const uint8_t *storage_data,
return( PSA_SUCCESS );
}
psa_status_t psa_save_persistent_key( const psa_key_id_t key,
psa_status_t psa_save_persistent_key( const psa_key_file_id_t key,
const psa_key_type_t type,
const psa_key_policy_t *policy,
const uint8_t *data,
@ -186,7 +186,7 @@ void psa_free_persistent_key_data( uint8_t *key_data, size_t key_data_length )
mbedtls_free( key_data );
}
psa_status_t psa_load_persistent_key( psa_key_id_t key,
psa_status_t psa_load_persistent_key( psa_key_file_id_t key,
psa_key_type_t *type,
psa_key_policy_t *policy,
uint8_t **data,

6
library/psa_crypto_storage.h
View file

@ -86,7 +86,7 @@ extern "C" {
* \retval PSA_ERROR_STORAGE_FAILURE
* \retval PSA_ERROR_ALREADY_EXISTS
*/
psa_status_t psa_save_persistent_key( const psa_key_id_t key,
psa_status_t psa_save_persistent_key( const psa_key_file_id_t key,
const psa_key_type_t type,
const psa_key_policy_t *policy,
const uint8_t *data,
@ -117,7 +117,7 @@ psa_status_t psa_save_persistent_key( const psa_key_id_t key,
* \retval PSA_ERROR_STORAGE_FAILURE
* \retval PSA_ERROR_DOES_NOT_EXIST
*/
psa_status_t psa_load_persistent_key( psa_key_id_t key,
psa_status_t psa_load_persistent_key( psa_key_file_id_t key,
psa_key_type_t *type,
psa_key_policy_t *policy,
uint8_t **data,
@ -134,7 +134,7 @@ psa_status_t psa_load_persistent_key( psa_key_id_t key,
* or the key did not exist.
* \retval PSA_ERROR_STORAGE_FAILURE
*/
psa_status_t psa_destroy_persistent_key( const psa_key_id_t key );
psa_status_t psa_destroy_persistent_key( const psa_key_file_id_t key );
/**
* \brief Free the temporary buffer allocated by psa_load_persistent_key().

8
library/psa_crypto_storage_backend.h
View file

@ -56,7 +56,7 @@ extern "C" {
* \retval PSA_ERROR_STORAGE_FAILURE
* \retval PSA_ERROR_DOES_NOT_EXIST
*/
psa_status_t psa_crypto_storage_load( const psa_key_id_t key, uint8_t *data,
psa_status_t psa_crypto_storage_load( const psa_key_file_id_t key, uint8_t *data,
size_t data_size );
/**
@ -75,7 +75,7 @@ psa_status_t psa_crypto_storage_load( const psa_key_id_t key, uint8_t *data,
* \retval PSA_ERROR_STORAGE_FAILURE
* \retval PSA_ERROR_ALREADY_EXISTS
*/
psa_status_t psa_crypto_storage_store( const psa_key_id_t key,
psa_status_t psa_crypto_storage_store( const psa_key_file_id_t key,
const uint8_t *data,
size_t data_length );
@ -92,7 +92,7 @@ psa_status_t psa_crypto_storage_store( const psa_key_id_t key,
* \retval 1
* Persistent data present for slot number
*/
int psa_is_key_present_in_storage( const psa_key_id_t key );
int psa_is_key_present_in_storage( const psa_key_file_id_t key );
/**
* \brief Get data length for given key slot number.
@ -104,7 +104,7 @@ int psa_is_key_present_in_storage( const psa_key_id_t key );
* \retval PSA_SUCCESS
* \retval PSA_ERROR_STORAGE_FAILURE
*/
psa_status_t psa_crypto_storage_get_data_length( const psa_key_id_t key,
psa_status_t psa_crypto_storage_get_data_length( const psa_key_file_id_t key,
size_t *data_length );

12
library/psa_crypto_storage_file.c
View file

@ -49,7 +49,7 @@
enum { MAX_LOCATION_LEN = sizeof(CRYPTO_STORAGE_FILE_LOCATION) + 40 };
static void key_id_to_location( const psa_key_id_t key,
static void key_id_to_location( const psa_key_file_id_t key,
char *location,
size_t location_size )
{
@ -58,7 +58,7 @@ static void key_id_to_location( const psa_key_id_t key,
(unsigned long) key );
}
psa_status_t psa_crypto_storage_load( const psa_key_id_t key, uint8_t *data,
psa_status_t psa_crypto_storage_load( const psa_key_file_id_t key, uint8_t *data,
size_t data_size )
{
psa_status_t status = PSA_SUCCESS;
@ -83,7 +83,7 @@ exit:
return( status );
}
int psa_is_key_present_in_storage( const psa_key_id_t key )
int psa_is_key_present_in_storage( const psa_key_file_id_t key )
{
char slot_location[MAX_LOCATION_LEN];
FILE *file;
@ -101,7 +101,7 @@ int psa_is_key_present_in_storage( const psa_key_id_t key )
return( 1 );
}
psa_status_t psa_crypto_storage_store( const psa_key_id_t key,
psa_status_t psa_crypto_storage_store( const psa_key_file_id_t key,
const uint8_t *data,
size_t data_length )
{
@ -156,7 +156,7 @@ exit:
return( status );
}
psa_status_t psa_destroy_persistent_key( const psa_key_id_t key )
psa_status_t psa_destroy_persistent_key( const psa_key_file_id_t key )
{
FILE *file;
char slot_location[MAX_LOCATION_LEN];
@ -175,7 +175,7 @@ psa_status_t psa_destroy_persistent_key( const psa_key_id_t key )
return( PSA_SUCCESS );
}
psa_status_t psa_crypto_storage_get_data_length( const psa_key_id_t key,
psa_status_t psa_crypto_storage_get_data_length( const psa_key_file_id_t key,
size_t *data_length )
{
psa_status_t status = PSA_SUCCESS;

12
library/psa_crypto_storage_its.c
View file

@ -36,12 +36,12 @@
#include "mbedtls/platform.h"
#endif
static psa_storage_uid_t psa_its_identifier_of_slot( psa_key_id_t key )
static psa_storage_uid_t psa_its_identifier_of_slot( psa_key_file_id_t key )
{
return( key );
}
psa_status_t psa_crypto_storage_load( const psa_key_id_t key, uint8_t *data,
psa_status_t psa_crypto_storage_load( const psa_key_file_id_t key, uint8_t *data,
size_t data_size )
{
psa_status_t status;
@ -57,7 +57,7 @@ psa_status_t psa_crypto_storage_load( const psa_key_id_t key, uint8_t *data,
return( status );
}
int psa_is_key_present_in_storage( const psa_key_id_t key )
int psa_is_key_present_in_storage( const psa_key_file_id_t key )
{
psa_status_t ret;
psa_storage_uid_t data_identifier = psa_its_identifier_of_slot( key );
@ -70,7 +70,7 @@ int psa_is_key_present_in_storage( const psa_key_id_t key )
return( 1 );
}
psa_status_t psa_crypto_storage_store( const psa_key_id_t key,
psa_status_t psa_crypto_storage_store( const psa_key_file_id_t key,
const uint8_t *data,
size_t data_length )
{
@ -105,7 +105,7 @@ exit:
return( status );
}
psa_status_t psa_destroy_persistent_key( const psa_key_id_t key )
psa_status_t psa_destroy_persistent_key( const psa_key_file_id_t key )
{
psa_status_t ret;
psa_storage_uid_t data_identifier = psa_its_identifier_of_slot( key );
@ -125,7 +125,7 @@ psa_status_t psa_destroy_persistent_key( const psa_key_id_t key )
return( PSA_SUCCESS );
}
psa_status_t psa_crypto_storage_get_data_length( const psa_key_id_t key,
psa_status_t psa_crypto_storage_get_data_length( const psa_key_file_id_t key,
size_t *data_length )
{
psa_status_t status;