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SSL asynchronous signature: first implementation

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Implement SSL asynchronous private operation for the case of a
signature operation in a server.

This is a first implementation. It is functional, but the code is not
clean, with heavy reliance on goto.
This commit is contained in:
Gilles Peskine 2018-01-05 21:20:50 +01:00
parent ebd652fe2d
commit 4bf9a28d1d
2 changed files with 62 additions and 6 deletions
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1
include/mbedtls/ssl_internal.h
View file

@ -220,6 +220,7 @@ struct mbedtls_ssl_handshake_params
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#if defined(MBEDTLS_SSL_ASYNC_PRIVATE_C)
void *p_async_operation_ctx; /*!< asynchronous operation context */
unsigned char *out_async_start; /*!< pointer where the asynchronous operation must write in the output buffer */
#endif /* MBEDTLS_SSL_ASYNC_PRIVATE_C */
#if defined(MBEDTLS_SSL_PROTO_DTLS)

67
library/ssl_srv.c
View file

@ -2843,6 +2843,17 @@ static int ssl_write_server_key_exchange( mbedtls_ssl_context *ssl )
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server key exchange" ) );
#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) && \
defined(MBEDTLS_SSL_ASYNC_PRIVATE_C)
if( ssl->handshake->out_async_start != NULL )
{
MBEDTLS_SSL_DEBUG_MSG( 2, ( "resuming signature operation" ) );
p = ssl->handshake->out_async_start;
goto async_resume;
}
#endif /* defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) &&
defined(MBEDTLS_SSL_ASYNC_PRIVATE_C) */
/*
*
* Part 1: Extract static ECDH parameters and abort
@ -3169,12 +3180,6 @@ curve_matching_done:
/*
* 3.3: Compute and add the signature
*/
if( mbedtls_ssl_own_key( ssl ) == NULL )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no private key" ) );
return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
}
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
{
@ -3199,6 +3204,55 @@ curve_matching_done:
}
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
#if defined(MBEDTLS_SSL_ASYNC_PRIVATE_C)
if( ssl->conf->f_async_sign_start != NULL )
{
size_t sig_max_len = ( ssl->out_buf + MBEDTLS_SSL_MAX_CONTENT_LEN
- ( p + 2 ) );
ret = ssl->conf->f_async_sign_start(
ssl->conf->p_async_connection_ctx,
&ssl->handshake->p_async_operation_ctx,
mbedtls_ssl_own_cert( ssl ),
md_alg, hash, hashlen );
switch( ret )
{
case MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH:
/* act as if f_async_sign was null */
break;
case 0:
async_resume:
ret = ssl->conf->f_async_resume(
ssl->conf->p_async_connection_ctx,
ssl->handshake->p_async_operation_ctx,
p + 2, &signature_len, sig_max_len );
if( ret != MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS )
{
ssl->handshake->p_async_operation_ctx = NULL;
if( ret != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "f_async_resume", ret );
return( ret );
}
goto have_signature;
}
/* FALLTHROUGH */
case MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS:
ssl->handshake->out_async_start = p;
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server key exchange (pending)" ) );
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_ssl_own_key( ssl ) == NULL )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no private key" ) );
return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
}
if( ( ret = mbedtls_pk_sign( mbedtls_ssl_own_key( ssl ), md_alg, hash, hashlen,
p + 2 , &signature_len, ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
{
@ -3206,6 +3260,7 @@ curve_matching_done:
return( ret );
}
have_signature:
*(p++) = (unsigned char)( signature_len >> 8 );
*(p++) = (unsigned char)( signature_len );