Expand the CHANGES entry for SHA1 and libssl

As well as SSL 3, TLS 1.0, TLS 1.1 and DTLS 1.0 not working at
security level 1 we also document that TLS 1.2 connection will fail
if the ClientHello does not have a signature algorithms extension.

Fixes #14447

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14465)
master
Matt Caswell 2 years ago
parent f74f416b91
commit 0966aee5ed

@ -568,7 +568,12 @@ OpenSSL 3.0
reduced. This results in SSL 3, TLS 1.0, TLS 1.1 and DTLS 1.0 no longer
working at the default security level of 1 and instead requires security
level 0. The security level can be changed either using the cipher string
with `@SECLEVEL`, or calling `SSL_CTX_set_security_level()`.
with `@SECLEVEL`, or calling `SSL_CTX_set_security_level()`. This also means
that where the signature algorithms extension is missing from a ClientHello
then the handshake will fail in TLS 1.2 at security level 1. This is because,
although this extension is optional, failing to provide one means that
OpenSSL will fallback to a default set of signature algorithms. This default
set requires the availability of SHA1.
*Kurt Roeckx*

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