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Add configuration identifier to serialized SSL sessions

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This commit adds space for two bytes in the header of serizlied
SSL sessions which can be used to determine the structure of the
remaining serialized session in the respective version of Mbed TLS.

Specifically, if parts of the session depend on whether specific
compile-time options are set or not, the setting of these options
can be encoded in the added space.

This commit doesn't yet make use of the fields.
This commit is contained in:
Hanno Becker 2019-05-16 12:41:07 +01:00 committed by Jarno Lamsa
parent a835da5cb1
commit f878707b8f
1 changed files with 14 additions and 5 deletions
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19
library/ssl_tls.c
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@ -9848,17 +9848,26 @@ const mbedtls_ssl_session *mbedtls_ssl_get_session_pointer( const mbedtls_ssl_co
* and structure of the ticket.
*/
static unsigned char ssl_serialized_session_header[] = {
MBEDTLS_VERSION_MAJOR,
MBEDTLS_VERSION_MINOR,
MBEDTLS_VERSION_PATCH,
};
static unsigned char ssl_serialized_session_header[] = {
MBEDTLS_VERSION_MAJOR,
MBEDTLS_VERSION_MINOR,
MBEDTLS_VERSION_PATCH,
0xFF /* TBD */,
0xFF /* TBD */
};
/*
* Serialize a session in the following format:
* (in the presentation language of TLS, RFC 8446 section 3)
*
* opaque mbedtls_version[3]; // major, minor, patch
* opaque session_format[2]; // version-specific 16-bit field determining
* // the format of the remaining serialized
* // data. For example, it could be a bitfield
* // indicating the setting of those compile-
* // time configuration options influencing
* // the format of the serialized data.
* // Unused so far.
* uint64 start_time;
* uint8 ciphersuite[2]; // defined by the standard
* uint8 compression; // 0 or 1