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Add: Support for specifying elliptic curves in TLS handshake #2512

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Add: Support for specifying elliptic curves in TLS handshake #2512

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Add: Support for specifying elliptic curves in TLS handshake
Sep 30, 2025
93fe07b
Update config/v1/types_tlssecurityprofile.go
richardsonnick Oct 2, 2025
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8 changes: 8 additions & 0 deletions config/v1/types_tlssecurityprofile.go
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Original file line number Diff line number Diff line change
Expand Up @@ -213,6 +213,14 @@ type TLSProfileSpec struct {
//
// +listType=atomic
Ciphers []string `json:"ciphers"`
// curves is used to specify the elliptic curves that are used during
// the TLS handshake. Operators may remove entries their operands do
// not support. For example, to use X25519 and P-256 (yaml):
//
// curves:
// - X25519
// - P-256
Curves []string `json:"curves,omitempty"`
Comment on lines +216 to +223
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@tmshort tmshort Oct 7, 2025 •
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My main concern here is the names used for these curves, as they are pretty much all over the place.

X25519 is pretty standard, but I've also seen ecdh_x25519: (openshift/cluster-ingress-operator#1287)

Then there's the P curves. Within golang, they are referred to as:

  • CurveP256
  • CurveP384
  • CurveP521

https://wiki.mozilla.org/Security/Server_Side_TLS refers to them as:

  • prime256v1
  • secp384r1

(No mention of secp521r1)
Note: OpenSSL/LibreSSL/BoringSSL also use these terms
Note: secp256r1 (usedin PR1287) is equivalent to prime256v1 but prime256v1 is more commonly used

This code seems to be using:

  • P-256

(And possibly P-384 and P-521)

We should pick one and use it all over openshift, so we don't need conversion functions all over the place.

// minTLSVersion is used to specify the minimal version of the TLS protocol
// that is negotiated during the TLS handshake. For example, to use TLS
// versions 1.1, 1.2 and 1.3 (yaml):
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