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opnsense-src/crypto/openssl/ssl/statem
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Enji Cooper cc43f991ab openssl: Import OpenSSL 3.0.15. 
This release incorporates the following bug fixes and mitigations:
- Fixed possible denial of service in X.509 name checks ([CVE-2024-6119])
- Fixed possible buffer overread in SSL_select_next_proto() ([CVE-2024-5535])

Release notes can be found at:
https://openssl-library.org/news/openssl-3.0-notes/index.html

Co-authored-by:	gordon
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D46602

Merge commit '108164cf95d9594884c2dcccba2691335e6f221b'

(cherry picked from commit a7148ab39c03abd4d1a84997c70bf96f15dd2a09)

Update config/build info for OpenSSL 3.0.15

This is a companion commit to the OpenSSL 3.0.15 update.

`opensslv.h` was regenerated via the following process:

```
cd crypto/openssl
./config
git reset --hard
gmake include/openssl/opensslv.h
```

`Makefile.inc` has been updated to match.

MFC after:	1 week
MFC with:	a7148ab39c03abd4d1a84997c70bf96f15dd2a09
Differential Revision:	https://reviews.freebsd.org/D46603

(cherry picked from commit cc717b574d7faa2e0b2de1a985076286cef74187)

sys/crypto/openssl: update powerpc* ASM

This change updates the crypto powerpc* ASM via the prescribed process
documented in `crypto/openssl/FREEBSD-upgrade`.

This change syncs the ASM with 3.0.15's generated ASM.

MFC after:	1 week
MFC with:	a7148ab39c03abd4d1a84997c70bf96f15dd2a09
MFC with:	cc717b574d7faa2e0b2de1a985076286cef74187
Differential Revision:	https://reviews.freebsd.org/D46604

(cherry picked from commit 77864b545b0aaa91bc78b1156c477825007a6233)
2024-09-27 20:50:47 -07:00
..
extensions.c openssl: Import OpenSSL 3.0.15. 2024-09-27 20:50:47 -07:00
extensions_clnt.c openssl: Import OpenSSL 3.0.15. 2024-09-27 20:50:47 -07:00
extensions_cust.c OpenSSL: Vendor import of OpenSSL 3.0.13 2024-02-05 08:06:08 -08:00
extensions_srvr.c openssl: Import OpenSSL 3.0.15. 2024-09-27 20:50:47 -07:00
README.md Merge OpenSSL 3.0.9 2023-06-23 18:53:36 -04:00
statem.c Merge OpenSSL 3.0.9 2023-06-23 18:53:36 -04:00
statem.h Merge OpenSSL 3.0.9 2023-06-23 18:53:36 -04:00
statem_clnt.c Merge OpenSSL 3.0.9 2023-06-23 18:53:36 -04:00
statem_dtls.c OpenSSL: Vendor import of OpenSSL 3.0.13 2024-02-05 08:06:08 -08:00
statem_lib.c openssl: Import OpenSSL 3.0.15. 2024-09-27 20:50:47 -07:00
statem_local.h Merge OpenSSL 3.0.9 2023-06-23 18:53:36 -04:00
statem_srvr.c Update to OpenSSL 3.0.14 2024-06-29 13:29:18 -07:00

README.md

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_local.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_lib.c                | | statem_dtls.c                 |
|                             | |                               |
| Non core functions common   | | Non core functions common to  |
| to both servers and clients | | both DTLS servers and clients |
|_____________________________| |_______________________________|