Setting cipher suite is possible using xpack.security.transport.ssl.cipher_suites, for example:
but there appears to be no setting to control the elliptic curve used for ephemeral Diffie–Hellman exchange. Is that correct or I am missing something?
As far as I know, there is no way in JSSE to set the preferred values for the
supported_groups extension that is used in the TLS 1.3 ( or
elliptic_curves as it used to be called in TLS 1.2 ) handshake to denote this.
You can probably set this as a JVM property in
jvm.properties using the
jdk.tls.namedGroups system property that is available since 8u21. Note that setting this will not only affect ECDHE but also ECDSA too.
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