Restrict HTTP/2 TLS cipher suites - #13428
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HTTP/2 can currently be negotiated with TLS 1.2 cipher suites that RFC 9113 prohibits. Clients that enforce the restriction can reject those connections instead of falling back to HTTP/1.1. This checks the pending cipher during ALPN selection and removes HTTP/2 when its IANA identifier is prohibited. This also adds AuTest coverage for permitted negotiation and HTTP/1.1 fallback. Fixes: apache#5287
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HTTP/2 can currently be negotiated with TLS 1.2 cipher suites that
RFC 9113 prohibits. Clients that enforce the restriction can reject
those connections instead of falling back to HTTP/1.1.
This checks the pending cipher during ALPN selection and removes
HTTP/2 when its IANA identifier is prohibited. This also adds AuTest
coverage for permitted negotiation and HTTP/1.1 fallback.
Fixes: #5287