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Merge remote-tracking branch 'origin/pr/572' into baremetal

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Simon Butcher 2019-06-18 14:56:13 +01:00
commit 0c7e36ccf8
5 changed files with 183 additions and 0 deletions
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27
include/mbedtls/config.h
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@ -1308,6 +1308,33 @@
*/
//#define MBEDTLS_SSL_ASYNC_PRIVATE
/**
* \def MBEDTLS_SSL_CONTEXT_SERIALIZATION
*
* Enable serialization of the TLS context structures, through use of the
* functions mbedtls_ssl_context_save() and mbedtls_ssl_context_load().
*
* This pair of functions allows one side of a connection to serialize the
* context associated with the connection, then free or re-use that context
* while the serialized state is persisted elsewhere, and finally deserialize
* that state to a live context for resuming read/write operations on the
* connection. From a protocol perspective, the state of the connection is
* unaffected, in particular this is entirely transparent to the peer.
*
* Note: this is distinct from TLS session resumption, which is part of the
* protocol and fully visible by the peer. TLS session resumption enables
* establishing new connections associated to a saved session with shorter,
* lighter handshakes, while context serialization is a local optimization in
* handling a single, potentially long-lived connection.
*
* Enabling these APIs makes some SSL structures larger, as 64 extra bytes are
* saved after the handshake to allow for more efficient serialization, so if
* you don't need this feature you'll save RAM by disabling it.
*
* Comment to disable the context serialization APIs.
*/
#define MBEDTLS_SSL_CONTEXT_SERIALIZATION
/**
* \def MBEDTLS_SSL_DEBUG_ALL
*

111
include/mbedtls/ssl.h
View File

@ -3552,6 +3552,117 @@ int mbedtls_ssl_close_notify( mbedtls_ssl_context *ssl );
*/
void mbedtls_ssl_free( mbedtls_ssl_context *ssl );
/**
* \brief Save an active connection as serialized data in a buffer.
* This allows the freeing or re-using of the SSL context
* while still picking up the connection later in a way that
* it entirely transparent to the peer.
*
* \see mbedtls_ssl_context_load()
*
* \note This feature is currently only available under certain
* conditions, see the documentation of the return value
* #MBEDTLS_ERR_SSL_BAD_INPUT_DATA for details.
*
* \note When this function succeeds, it calls
* mbedtls_ssl_session_reset() on \p ssl which as a result is
* no longer associated with the connection that has been
* serialized. This avoids creating copies of the session
* state. You're then free to either re-use the context
* structure for a different connection, or call
* mbedtls_ssl_session_free() on it. See the documentation of
* mbedtls_ssl_session_reset() for more details.
*
* \param ssl The SSL context to save. On success, it is no longer
* associated with the connection that has been serialized.
* \param buf The buffer to write the serialized data to. It must be a
* writeable buffer of at least \p len bytes, or may be \c
* NULL if \p len is \c 0.
* \param buf_len The number of bytes available for writing in \p buf.
* \param olen The size in bytes of the data that has been or would have
* been written. It must point to a valid \c size_t.
*
* \note \p olen is updated to the correct value regardless of
* whether \p buf_len was large enough. This makes it possible
* to determine the necessary size by calling this function
* with \p buf set to \c NULL and \p buf_len to \c 0.
*
* \return \c 0 if successful.
* \return #MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL if \p buf is too small.
* \return #MBEDTLS_ERR_SSL_BAD_INPUT_DATA if a handshake is in
* progress, or there is pending data for reading or sending,
* or the connection does not use DTLS 1.2 with and AEAD
* ciphersuite, or renegotiation is enabled.
*/
int mbedtls_ssl_context_save( mbedtls_ssl_context *ssl,
unsigned char *buf,
size_t buf_len,
size_t *olen );
/**
* \brief Load serialized connection data to an SSL context.
*
* \see mbedtls_ssl_context_save()
*
* \warning The same serialized data must never be loaded into more
* that one context. In order to ensure that, after
* successfully loading serialized data to an SSL context, you
* should immediately destroy or invalidate all copies of the
* serialized data that was loaded. Loading the same data in
* more than one context would cause severe security failures
* including but not limited to loss of confidentiality.
*
* \note Before calling this function, the SSL context must be
* prepared in one of the two following ways. The first way is
* to take a context freshly initialised with
* mbedtls_ssl_init() and call mbedtls_ssl_setup() on it with
* the same ::mbedtls_ssl_config structure that was used in
* the original connection. The second way is to
* call mbedtls_ssl_session_reset() on a context that was
* previously prepared as above but used in the meantime.
* Either way, you must not use the context to perform a
* handshake between calling mbedtls_ssl_setup() or
* mbedtls_ssl_session_reset() and calling this function. You
* may however call other setter functions in that time frame
* as indicated in the note below.
*
* \note Before or after calling this function successfully, you
* also need to configure some connection-specific callbacks
* and settings before you can use the connection again
* (unless they were already set before calling
* mbedtls_ssl_session_reset() and the values are suitable for
* the present connection). Specifically, you want to call
* at least mbedtls_ssl_set_bio(). If you're using a read
* timeout (that is, you called
* mbedtls_ssl_conf_read_timeout() with a non-zero timeout)
* and non-blocking I/O, you also need to set timer callbacks
* by calling mbedtls_ssl_set_timer_cb(). All other SSL setter
* functions are not necessary to call, either because they're
* only used in handshakes, or because the setting is already
* saved. You might choose to call them anyway, for example in
* order to share code between the cases of establishing a new
* connection and the case of loading an already-established
* connection.
*
* \note If you have new information about the path MTU, you want to
* call mbedtls_ssl_set_mtu() after calling this function, as
* otherwise this function would overwrite your
* newly-configured value with the value that was active when
* the context was saved.
*
* \param ssl The SSL context structure to be populated. It must have
* been prepared as described in the note above.
* \param buf The buffer holding the serialized connection data. It must
* be a readable buffer of at least \p len bytes.
* \param len The size of the serialized data in bytes.
*
* \return \c 0 if successful.
* \return #MBEDTLS_ERR_SSL_ALLOC_FAILED if memory allocation failed.
* \return #MBEDTLS_ERR_SSL_BAD_INPUT_DATA if input data is invalid.
*/
int mbedtls_ssl_context_load( mbedtls_ssl_context *ssl,
const unsigned char *buf,
size_t len );
/**
* \brief Initialize an SSL configuration context
* Just makes the context ready for

34
library/ssl_tls.c
View File

@ -10213,6 +10213,40 @@ void mbedtls_ssl_session_free( mbedtls_ssl_session *session )
mbedtls_platform_zeroize( session, sizeof( mbedtls_ssl_session ) );
}
/*
* Serialize a full SSL context
*/
int mbedtls_ssl_context_save( mbedtls_ssl_context *ssl,
unsigned char *buf,
size_t buf_len,
size_t *olen )
{
/* Unimplemented */
(void) ssl;
if( buf != NULL )
memset( buf, 0, buf_len );
*olen = 0;
return( 0 );
}
/*
* Deserialize a full SSL context
*/
int mbedtls_ssl_context_load( mbedtls_ssl_context *ssl,
const unsigned char *buf,
size_t len )
{
/* Unimplemented */
(void) ssl;
(void) buf;
(void) len;
return( 0 );
}
/*
* Free an SSL context
*/

3
library/version_features.c
View File

@ -441,6 +441,9 @@ static const char *features[] = {
#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
"MBEDTLS_SSL_ASYNC_PRIVATE",
#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
"MBEDTLS_SSL_CONTEXT_SERIALIZATION",
#endif /* MBEDTLS_SSL_CONTEXT_SERIALIZATION */
#if defined(MBEDTLS_SSL_DEBUG_ALL)
"MBEDTLS_SSL_DEBUG_ALL",
#endif /* MBEDTLS_SSL_DEBUG_ALL */

8
programs/ssl/query_config.c
View File

@ -1218,6 +1218,14 @@ int query_config( const char *config )
}
#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
if( strcmp( "MBEDTLS_SSL_CONTEXT_SERIALIZATION", config ) == 0 )
{
MACRO_EXPANSION_TO_STR( MBEDTLS_SSL_CONTEXT_SERIALIZATION );
return( 0 );
}
#endif /* MBEDTLS_SSL_CONTEXT_SERIALIZATION */
#if defined(MBEDTLS_SSL_DEBUG_ALL)
if( strcmp( "MBEDTLS_SSL_DEBUG_ALL", config ) == 0 )
{