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Improve save API by always updating olen

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This allows callers to discover what an appropriate size is. Otherwise they'd
have to either try repeatedly, or allocate an overly large buffer (or some
combination of those).

Adapt documentation an example usage in ssl_client2.
This commit is contained in:
Manuel Pégourié-Gonnard 2019-05-21 11:01:32 +02:00
parent 57a348ba8c
commit 32ce596c35
3 changed files with 71 additions and 34 deletions
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12
include/mbedtls/ssl.h
View file

@ -2188,10 +2188,16 @@ int mbedtls_ssl_session_load( mbedtls_ssl_session *session,
*
* \param session The session structure to be saved.
* \param buf The buffer to write the serialized data to. It must be a
* writeable buffer of at least \p len bytes.
* 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 of the written data in bytes. It must point to a
* valid \c size_t.
* \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.

29
library/ssl_tls.c
View file

@ -8791,7 +8791,7 @@ int mbedtls_ssl_session_save( const mbedtls_ssl_session *session,
size_t *olen )
{
unsigned char *p = buf;
size_t left = buf_len;
size_t used = 0;
#if defined(MBEDTLS_X509_CRT_PARSE_C)
size_t cert_len;
#endif /* MBEDTLS_X509_CRT_PARSE_C */
@ -8799,12 +8799,13 @@ int mbedtls_ssl_session_save( const mbedtls_ssl_session *session,
/*
* Shallow copy of the session structure
*/
if( left < sizeof( mbedtls_ssl_session ) )
return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
left -= sizeof( mbedtls_ssl_session );
used += sizeof( mbedtls_ssl_session );
if( used <= buf_len )
{
memcpy( p, session, sizeof( mbedtls_ssl_session ) );
p += sizeof( mbedtls_ssl_session );
}
/*
* Copy of the peer's end-entity certificate
@ -8815,10 +8816,10 @@ int mbedtls_ssl_session_save( const mbedtls_ssl_session *session,
else
cert_len = session->peer_cert->raw.len;
if( left < 3 + cert_len )
return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
left -= 3 + cert_len;
used += 3 + cert_len;
if( used <= buf_len )
{
*p++ = (unsigned char)( ( cert_len >> 16 ) & 0xFF );
*p++ = (unsigned char)( ( cert_len >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( cert_len ) & 0xFF );
@ -8828,16 +8829,17 @@ int mbedtls_ssl_session_save( const mbedtls_ssl_session *session,
memcpy( p, session->peer_cert->raw.p, cert_len );
p += cert_len;
}
}
#endif /* MBEDTLS_X509_CRT_PARSE_C */
/*
* Copy of the session ticket if any
*/
#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
if( left < 3 + session->ticket_len )
return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
left -= 3 + session->ticket_len;
used += 3 + session->ticket_len;
if( used <= buf_len )
{
*p++ = (unsigned char)( ( session->ticket_len >> 16 ) & 0xFF );
*p++ = (unsigned char)( ( session->ticket_len >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( session->ticket_len ) & 0xFF );
@ -8847,11 +8849,14 @@ int mbedtls_ssl_session_save( const mbedtls_ssl_session *session,
memcpy( p, session->ticket, session->ticket_len );
p += session->ticket_len;
}
}
#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
/* Done */
(void) left;
*olen = p - buf;
*olen = used;
if( used > buf_len )
return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
return( 0 );
}

32
programs/ssl/ssl_client2.c
View file

@ -36,6 +36,8 @@
#define mbedtls_fprintf fprintf
#define mbedtls_snprintf snprintf
#define mbedtls_exit exit
#define mbedtls_calloc calloc
#define mbedtls_free free
#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
#endif
@ -721,8 +723,8 @@ int main( int argc, char *argv[] )
mbedtls_ssl_context ssl;
mbedtls_ssl_config conf;
mbedtls_ssl_session saved_session;
unsigned char session_data[MBEDTLS_SSL_MAX_CONTENT_LEN];
size_t session_data_len;
unsigned char *session_data = NULL;
size_t session_data_len = 0;
#if defined(MBEDTLS_TIMING_C)
mbedtls_timing_delay_context timer;
#endif
@ -1879,8 +1881,25 @@ int main( int argc, char *argv[] )
if( opt.reco_mode == 1 )
{
/* free any previously saved data */
mbedtls_free( session_data );
session_data = NULL;
/* get size of the buffer needed */
mbedtls_ssl_session_save( mbedtls_ssl_get_session_pointer( &ssl ),
NULL, 0, &session_data_len );
session_data = mbedtls_calloc( 1, session_data_len );
if( session_data == NULL )
{
mbedtls_printf( " failed\n ! alloc %u bytes for session data\n",
(unsigned) session_data_len );
ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
goto exit;
}
/* actually save session data */
if( ( ret = mbedtls_ssl_session_save( mbedtls_ssl_get_session_pointer( &ssl ),
session_data, sizeof( session_data ),
session_data, session_data_len,
&session_data_len ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_ssl_session_saved returned -0x%04x\n\n",
@ -1899,6 +1918,12 @@ int main( int argc, char *argv[] )
}
mbedtls_printf( " ok\n" );
if( opt.reco_mode == 1 )
{
mbedtls_printf( " [ Saved %u bytes of session data]\n",
(unsigned) session_data_len );
}
}
#if defined(MBEDTLS_X509_CRT_PARSE_C)
@ -2416,6 +2441,7 @@ exit:
mbedtls_ssl_config_free( &conf );
mbedtls_ctr_drbg_free( &ctr_drbg );
mbedtls_entropy_free( &entropy );
mbedtls_free( session_data );
#if defined(_WIN32)
mbedtls_printf( " + Press Enter to exit this program.\n" );