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SSL asynchronous decryption (server side)

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Support SSL asynchronous private operation for the case of a
decryption operation on a server.
This commit is contained in:
Gilles Peskine 2018-01-12 13:46:43 +01:00
parent bcd98a5306
commit 2c6078ed3b
1 changed files with 89 additions and 0 deletions
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89
library/ssl_srv.c
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@ -3416,6 +3416,25 @@ static int ssl_parse_client_dh_public( mbedtls_ssl_context *ssl, unsigned char *
#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \
defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
#if defined(MBEDTLS_SSL_ASYNC_PRIVATE_C)
static int ssl_resume_decrypt_pms( mbedtls_ssl_context *ssl,
unsigned char *peer_pms,
size_t *peer_pmslen,
size_t peer_pmssize )
{
int ret = ssl->conf->f_async_resume( ssl->conf->p_async_connection_ctx,
ssl->handshake->p_async_operation_ctx,
peer_pms, peer_pmslen, peer_pmssize );
if( ret != MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS )
{
ssl->handshake->p_async_operation_ctx = NULL;
}
MBEDTLS_SSL_DEBUG_RET( 2, "ssl_decrypt_encrypted_pms", ret );
return( ret );
}
#endif /* MBEDTLS_SSL_ASYNC_PRIVATE_C */
static int ssl_decrypt_encrypted_pms( mbedtls_ssl_context *ssl,
const unsigned char *p,
const unsigned char *end,
@ -3428,6 +3447,17 @@ static int ssl_decrypt_encrypted_pms( mbedtls_ssl_context *ssl,
mbedtls_pk_context *public_key = &mbedtls_ssl_own_cert( ssl )->pk;
size_t len = mbedtls_pk_get_len( public_key );
#if defined(MBEDTLS_SSL_ASYNC_PRIVATE_C)
/* If we have already started decoding the message and there is an ongoing
decryption operation, resume signing. */
if( ssl->handshake->p_async_operation_ctx != NULL )
{
MBEDTLS_SSL_DEBUG_MSG( 2, ( "resuming decryption operation" ) );
return( ssl_resume_decrypt_pms( ssl,
peer_pms, peer_pmslen, peer_pmssize ) );
}
#endif /* MBEDTLS_SSL_ASYNC_PRIVATE_C */
/*
* Prepare to decrypt the premaster using own private RSA key
*/
@ -3453,6 +3483,33 @@ static int ssl_decrypt_encrypted_pms( mbedtls_ssl_context *ssl,
/*
* Decrypt the premaster secret
*/
#if defined(MBEDTLS_SSL_ASYNC_PRIVATE_C)
if( ssl->conf->f_async_decrypt_start != NULL )
{
ret = ssl->conf->f_async_decrypt_start(
ssl->conf->p_async_connection_ctx,
&ssl->handshake->p_async_operation_ctx,
mbedtls_ssl_own_cert( ssl ),
p, len );
switch( ret )
{
case MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH:
/* act as if f_async_decrypt_start was null */
break;
case 0:
return( ssl_resume_decrypt_pms( ssl,
peer_pms,
peer_pmslen,
peer_pmssize ) );
case MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS:
return( MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS );
default:
MBEDTLS_SSL_DEBUG_RET( 1, "f_async_sign", ret );
return( ret );
}
}
#endif /* MBEDTLS_SSL_ASYNC_PRIVATE_C */
if( ! mbedtls_pk_can_do( private_key, MBEDTLS_PK_RSA ) )
{
/* */
@ -3484,6 +3541,11 @@ static int ssl_parse_encrypted_pms( mbedtls_ssl_context *ssl,
&peer_pmslen,
sizeof( peer_pms ) );
#if defined(MBEDTLS_SSL_ASYNC_PRIVATE_C)
if ( ret == MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS )
return( ret );
#endif /* MBEDTLS_SSL_ASYNC_PRIVATE_C */
/*
* Protection against Bleichenbacher's attack: invalid PKCS#1 v1.5 padding
* must not cause the connection to end immediately; instead, send a
@ -3620,6 +3682,20 @@ static int ssl_parse_client_key_exchange( mbedtls_ssl_context *ssl )
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client key exchange" ) );
#if defined(MBEDTLS_SSL_ASYNC_PRIVATE_C) && \
( defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \
defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) )
if( ( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ||
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA ) &&
( ssl->handshake->p_async_operation_ctx != NULL ) )
{
/* We've already read a record and there is an asynchronous
* operation in progress to decrypt it. So skip reading the
record. */
MBEDTLS_SSL_DEBUG_MSG( 3, ( "will resume decryption of previously-read record" ) );
}
else
#endif
if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
@ -3732,6 +3808,19 @@ static int ssl_parse_client_key_exchange( mbedtls_ssl_context *ssl )
#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
{
#if defined(MBEDTLS_SSL_ASYNC_PRIVATE_C)
if ( ssl->handshake->p_async_operation_ctx != NULL )
{
/* There is an asynchronous operation in progress to
* decrypt the encrypted premaster secret, so skip
* directly to resuming this operation. */
MBEDTLS_SSL_DEBUG_MSG( 3, ( "PSK identity already parsed" ) );
/* Update p to skip the PSK identity. ssl_parse_encrypted_pms
* won't actually use it, but maintain p anyway for robustness. */
p += ssl->conf->psk_identity_len + 2;
}
else
#endif /* MBEDTLS_SSL_ASYNC_PRIVATE_C */
if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );