openssl/ssl/statem
Matt Caswell 2813852d71 Fix a race condition in supported groups handling
In TLSv1.3 the supported groups can be negotiated each time a handshake
occurs, regardless of whether we are resuming or not. We should not store
the supported groups information in the session because session objects
can be shared between multiple threads and we can end up with race
conditions. For most users this won't be seen because, by default, we
use stateless tickets in TLSv1.3 which don't get shared. However if you
use SSL_OP_NO_TICKET (to get stateful tickets in TLSv1.3) then this can
happen.

The answer is to move the supported the supported group information into
the SSL object instead.

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/9176)
2019-06-18 14:26:16 +01:00
..
extensions.c Don't write the tick_identity to the session 2019-03-05 14:28:27 +00:00
extensions_clnt.c Update copyright year 2019-05-28 14:49:38 +02:00
extensions_cust.c Update copyright year 2018-02-13 13:59:25 +00:00
extensions_srvr.c Fix a race condition in supported groups handling 2019-06-18 14:26:16 +01:00
README
statem.c Update copyright year 2019-02-26 14:05:09 +00:00
statem.h Tolerate encrypted or plaintext alerts 2018-08-08 10:16:58 +01:00
statem_clnt.c Defer sending a KeyUpdate until after pending writes are complete 2019-06-03 11:57:31 +01:00
statem_dtls.c Don't memcpy the contents of an empty fragment 2018-05-12 09:59:02 +01:00
statem_lib.c Defer sending a KeyUpdate until after pending writes are complete 2019-06-03 11:57:31 +01:00
statem_locl.h Update copyright year 2019-02-26 14:05:09 +00:00
statem_srvr.c Defer sending a KeyUpdate until after pending writes are complete 2019-06-03 11:57:31 +01:00

State Machine Design
====================

This file provides some guidance on the thinking behind the design of the
state machine code to aid future maintenance.

The state machine code replaces an older state machine present in OpenSSL
versions 1.0.2 and below. The new state machine has the following objectives:
    - Remove duplication of state code between client and server
    - Remove duplication of state code between TLS and DTLS
    - Simplify transitions and bring the logic together in a single location
      so that it is easier to validate
    - Remove duplication of code between each of the message handling functions
    - Receive a message first and then work out whether that is a valid
      transition - not the other way around (the other way causes lots of issues
      where we are expecting one type of message next but actually get something
      else)
    - Separate message flow state from handshake state (in order to better
      understand each)
      - message flow state = when to flush buffers; handling restarts in the
        event of NBIO events; handling the common flow of steps for reading a
        message and the common flow of steps for writing a message etc
      - handshake state = what handshake message are we working on now
    - Control complexity: only the state machine can change state: keep all
      the state changes local to the state machine component

The message flow state machine is divided into a reading sub-state machine and a
writing sub-state machine. See the source comments in statem.c for a more
detailed description of the various states and transitions possible.

Conceptually the state machine component is designed as follows:

                        libssl
                           |
---------------------------|-----statem.h--------------------------------------
                           |
                    _______V____________________
                   |                            |
                   |    statem.c                |
                   |                            |
                   |    Core state machine code |
                   |____________________________|
        statem_locl.h     ^          ^
                 _________|          |_______
                |                            |
   _____________|____________   _____________|____________
  |                          | |                          |
  | statem_clnt.c            | | statem_srvr.c            |
  |                          | |                          |
  | TLS/DTLS client specific | | TLS/DTLS server specific |
  | state machine code       | | state machine code       |
  |__________________________| |__________________________|
               |        |_______________|__       |
               |        ________________|  |      |
               |       |                   |      |
   ____________V_______V________   ________V______V_______________
  |                             | |                               |
  | statem_both.c               | | statem_dtls.c                 |
  |                             | |                               |
  | Non core functions common   | | Non core functions common to  |
  | to both servers and clients | | both DTLS servers and clients |
  |_____________________________| |_______________________________|