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Use PSA in TLS ticket handling

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Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
This commit is contained in:
Gabor Mezei 2022-03-10 15:15:46 +01:00
parent e6d867f476
commit 2a02051286
No known key found for this signature in database
GPG key ID: 106F5A41ECC305BD
2 changed files with 123 additions and 17 deletions
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11
include/mbedtls/ssl_ticket.h
View file

@ -34,6 +34,10 @@
#include "mbedtls/ssl.h"
#include "mbedtls/cipher.h"
#if defined(MBEDTLS_USE_PSA_CRYPTO)
#include "psa/crypto.h"
#endif
#if defined(MBEDTLS_THREADING_C)
#include "mbedtls/threading.h"
#endif
@ -53,7 +57,14 @@ typedef struct mbedtls_ssl_ticket_key
unsigned char MBEDTLS_PRIVATE(name)[MBEDTLS_SSL_TICKET_KEY_NAME_BYTES];
/*!< random key identifier */
uint32_t MBEDTLS_PRIVATE(generation_time); /*!< key generation timestamp (seconds) */
#if !defined(MBEDTLS_USE_PSA_CRYPTO)
mbedtls_cipher_context_t MBEDTLS_PRIVATE(ctx); /*!< context for auth enc/decryption */
#else
mbedtls_svc_key_id_t MBEDTLS_PRIVATE(key); /*!< key used for auth enc/decryption */
psa_algorithm_t MBEDTLS_PRIVATE(alg); /*!< algorithm of auth enc/decryption */
psa_key_type_t MBEDTLS_PRIVATE(key_type); /*!< key type */
size_t MBEDTLS_PRIVATE(key_bits); /*!< key length in bits */
#endif
}
mbedtls_ssl_ticket_key;

129
library/ssl_ticket.c
View file

@ -73,6 +73,10 @@ static int ssl_ticket_gen_key( mbedtls_ssl_ticket_context *ctx,
unsigned char buf[MAX_KEY_BYTES];
mbedtls_ssl_ticket_key *key = ctx->keys + index;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
#endif
#if defined(MBEDTLS_HAVE_TIME)
key->generation_time = (uint32_t) mbedtls_time( NULL );
#endif
@ -83,11 +87,28 @@ static int ssl_ticket_gen_key( mbedtls_ssl_ticket_context *ctx,
if( ( ret = ctx->f_rng( ctx->p_rng, buf, sizeof( buf ) ) ) != 0 )
return( ret );
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_set_key_usage_flags( &attributes,
PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT );
psa_set_key_algorithm( &attributes, key->alg );
psa_set_key_type( &attributes, key->key_type );
psa_set_key_bits( &attributes, key->key_bits );
ret = psa_ssl_status_to_mbedtls(
psa_import_key( &attributes, buf,
PSA_BITS_TO_BYTES( key->key_bits ),
&key->key ) );
#else
/* With GCM and CCM, same context can encrypt & decrypt */
ret = mbedtls_cipher_setkey( &key->ctx, buf,
mbedtls_cipher_get_key_bitlen( &key->ctx ),
MBEDTLS_ENCRYPT );
#endif /* MBEDTLS_USE_PSA_CRYPTO */
mbedtls_platform_zeroize( buf, sizeof( buf ) );
return( ret );
@ -106,6 +127,10 @@ static int ssl_ticket_update_keys( mbedtls_ssl_ticket_context *ctx )
uint32_t current_time = (uint32_t) mbedtls_time( NULL );
uint32_t key_time = ctx->keys[ctx->active].generation_time;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
#endif
if( current_time >= key_time &&
current_time - key_time < ctx->ticket_lifetime )
{
@ -114,6 +139,14 @@ static int ssl_ticket_update_keys( mbedtls_ssl_ticket_context *ctx )
ctx->active = 1 - ctx->active;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( ( ret = psa_ssl_status_to_mbedtls(
psa_destroy_key( ctx->keys[ctx->active].key ) ) ) != 0 )
return( ret );
#endif /* MBEDTLS_USE_PSA_CRYPTO */
return( ssl_ticket_gen_key( ctx, ctx->active ) );
}
else
@ -131,16 +164,44 @@ int mbedtls_ssl_ticket_rotate( mbedtls_ssl_ticket_context *ctx,
{
const unsigned char idx = 1 - ctx->active;
mbedtls_ssl_ticket_key * const key = ctx->keys + idx;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
const int bitlen = key->key_bits;
#else
const int bitlen = mbedtls_cipher_get_key_bitlen( &key->ctx );
int ret;
#endif
if( nlength < TICKET_KEY_NAME_BYTES || klength * 8 < (size_t)bitlen )
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
/* With GCM and CCM, same context can encrypt & decrypt */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( ( ret = psa_ssl_status_to_mbedtls(
psa_destroy_key( key->key ) ) ) != 0 )
return( ret );
psa_set_key_usage_flags( &attributes,
PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT );
psa_set_key_algorithm( &attributes, key->alg );
psa_set_key_type( &attributes, key->key_type );
psa_set_key_bits( &attributes, key->key_bits );
if( ( ret = psa_ssl_status_to_mbedtls(
psa_import_key( &attributes, k,
PSA_BITS_TO_BYTES( key->key_bits ),
&key->key ) ) ) != 0 )
return( ret );
#else
ret = mbedtls_cipher_setkey( &key->ctx, k, bitlen, MBEDTLS_ENCRYPT );
if( ret != 0 )
return( ret );
#endif /* MBEDTLS_USE_PSA_CRYPTO */
ctx->active = idx;
ctx->ticket_lifetime = lifetime;
memcpy( key->name, name, TICKET_KEY_NAME_BYTES );
@ -161,6 +222,12 @@ int mbedtls_ssl_ticket_setup( mbedtls_ssl_ticket_context *ctx,
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
const mbedtls_cipher_info_t *cipher_info;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_algorithm_t alg;
psa_key_type_t key_type;
size_t key_bits;
#endif
ctx->f_rng = f_rng;
ctx->p_rng = p_rng;
@ -178,27 +245,29 @@ int mbedtls_ssl_ticket_setup( mbedtls_ssl_ticket_context *ctx,
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
#if defined(MBEDTLS_USE_PSA_CRYPTO)
ret = mbedtls_cipher_setup_psa( &ctx->keys[0].ctx,
cipher_info, TICKET_AUTH_TAG_BYTES );
if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE )
return( ret );
/* We don't yet expect to support all ciphers through PSA,
* so allow fallback to ordinary mbedtls_cipher_setup(). */
if( ret == MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE )
#endif /* MBEDTLS_USE_PSA_CRYPTO */
if( mbedtls_ssl_cipher_to_psa( cipher_info->type, TICKET_AUTH_TAG_BYTES,
&alg, &key_type, &key_bits ) != PSA_SUCCESS )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
ctx->keys[0].alg = alg;
ctx->keys[0].key_type = key_type;
ctx->keys[0].key_bits = key_bits;
ctx->keys[1].alg = alg;
ctx->keys[1].key_type = key_type;
ctx->keys[1].key_bits = key_bits;
#else
if( ( ret = mbedtls_cipher_setup( &ctx->keys[0].ctx, cipher_info ) ) != 0 )
return( ret );
#if defined(MBEDTLS_USE_PSA_CRYPTO)
ret = mbedtls_cipher_setup_psa( &ctx->keys[1].ctx,
cipher_info, TICKET_AUTH_TAG_BYTES );
if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE )
return( ret );
if( ret == MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE )
#endif /* MBEDTLS_USE_PSA_CRYPTO */
if( ( ret = mbedtls_cipher_setup( &ctx->keys[1].ctx, cipher_info ) ) != 0 )
return( ret );
#endif /* MBEDTLS_USE_PSA_CRYPTO */
if( ( ret = ssl_ticket_gen_key( ctx, 0 ) ) != 0 ||
( ret = ssl_ticket_gen_key( ctx, 1 ) ) != 0 )
{
@ -275,6 +344,13 @@ int mbedtls_ssl_ticket_write( void *p_ticket,
MBEDTLS_PUT_UINT16_BE( clear_len, state_len_bytes, 0 );
/* Encrypt and authenticate */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( ( ret = psa_ssl_status_to_mbedtls(
psa_aead_encrypt( key->key, key->alg, iv, TICKET_IV_BYTES,
key_name, TICKET_ADD_DATA_LEN,
state, clear_len,
state, end - state, &ciph_len ) ) ) != 0 )
#else
if( ( ret = mbedtls_cipher_auth_encrypt_ext( &key->ctx,
iv, TICKET_IV_BYTES,
/* Additional data: key name, IV and length */
@ -282,9 +358,11 @@ int mbedtls_ssl_ticket_write( void *p_ticket,
state, clear_len,
state, end - state, &ciph_len,
TICKET_AUTH_TAG_BYTES ) ) != 0 )
#endif /* MBEDTLS_USE_PSA_CRYPTO */
{
goto cleanup;
}
if( ciph_len != clear_len + TICKET_AUTH_TAG_BYTES )
{
ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
@ -367,6 +445,13 @@ int mbedtls_ssl_ticket_parse( void *p_ticket,
}
/* Decrypt and authenticate */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( ( ret = psa_ssl_status_to_mbedtls(
psa_aead_decrypt( key->key, key->alg, iv, TICKET_IV_BYTES,
key_name, TICKET_ADD_DATA_LEN,
ticket, enc_len + TICKET_AUTH_TAG_BYTES,
ticket, enc_len, &clear_len ) ) ) != 0 )
#else
if( ( ret = mbedtls_cipher_auth_decrypt_ext( &key->ctx,
iv, TICKET_IV_BYTES,
/* Additional data: key name, IV and length */
@ -374,6 +459,7 @@ int mbedtls_ssl_ticket_parse( void *p_ticket,
ticket, enc_len + TICKET_AUTH_TAG_BYTES,
ticket, enc_len, &clear_len,
TICKET_AUTH_TAG_BYTES ) ) != 0 )
#endif /* MBEDTLS_USE_PSA_CRYPTO */
{
if( ret == MBEDTLS_ERR_CIPHER_AUTH_FAILED )
ret = MBEDTLS_ERR_SSL_INVALID_MAC;
@ -418,9 +504,18 @@ cleanup:
*/
void mbedtls_ssl_ticket_free( mbedtls_ssl_ticket_context *ctx )
{
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_destroy_key( ctx->keys[0].key );
psa_destroy_key( ctx->keys[1].key );
#else
mbedtls_cipher_free( &ctx->keys[0].ctx );
mbedtls_cipher_free( &ctx->keys[1].ctx );
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_THREADING_C)
mbedtls_mutex_free( &ctx->mutex );
#endif