mirror of
https://github.com/refraction-networking/utls.git
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309a3593cd
This enables TLS 1.3, disables P-521, and disables non-ECDHE suites. Reapplies CL 549975. Updates #64717 Updates #62372 Change-Id: I6c608704638d59a063a657fbd4eb1126027112dd Reviewed-on: https://go-review.googlesource.com/c/go/+/603376 Reviewed-by: Roland Shoemaker <roland@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: David Chase <drchase@google.com>
129 lines
3.9 KiB
Go
129 lines
3.9 KiB
Go
// Copyright 2024 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package tls
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import (
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"internal/godebug"
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"slices"
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_ "unsafe" // for linkname
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)
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// Defaults are collected in this file to allow distributions to more easily patch
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// them to apply local policies.
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var tlskyber = godebug.New("tlskyber")
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func defaultCurvePreferences() []CurveID {
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if tlskyber.Value() == "0" {
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return []CurveID{X25519, CurveP256, CurveP384, CurveP521}
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}
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// For now, x25519Kyber768Draft00 must always be followed by X25519.
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return []CurveID{x25519Kyber768Draft00, X25519, CurveP256, CurveP384, CurveP521}
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}
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// defaultSupportedSignatureAlgorithms contains the signature and hash algorithms that
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// the code advertises as supported in a TLS 1.2+ ClientHello and in a TLS 1.2+
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// CertificateRequest. The two fields are merged to match with TLS 1.3.
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// Note that in TLS 1.2, the ECDSA algorithms are not constrained to P-256, etc.
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var defaultSupportedSignatureAlgorithms = []SignatureScheme{
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PSSWithSHA256,
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ECDSAWithP256AndSHA256,
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Ed25519,
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PSSWithSHA384,
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PSSWithSHA512,
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PKCS1WithSHA256,
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PKCS1WithSHA384,
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PKCS1WithSHA512,
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ECDSAWithP384AndSHA384,
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ECDSAWithP521AndSHA512,
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PKCS1WithSHA1,
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ECDSAWithSHA1,
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}
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var tlsrsakex = godebug.New("tlsrsakex")
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var tls3des = godebug.New("tls3des")
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func defaultCipherSuites() []uint16 {
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suites := slices.Clone(cipherSuitesPreferenceOrder)
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return slices.DeleteFunc(suites, func(c uint16) bool {
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return disabledCipherSuites[c] ||
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tlsrsakex.Value() != "1" && rsaKexCiphers[c] ||
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tls3des.Value() != "1" && tdesCiphers[c]
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})
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}
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// defaultCipherSuitesTLS13 is also the preference order, since there are no
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// disabled by default TLS 1.3 cipher suites. The same AES vs ChaCha20 logic as
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// cipherSuitesPreferenceOrder applies.
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//
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// defaultCipherSuitesTLS13 should be an internal detail,
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// but widely used packages access it using linkname.
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// Notable members of the hall of shame include:
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// - github.com/quic-go/quic-go
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// - github.com/sagernet/quic-go
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//
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// Do not remove or change the type signature.
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// See go.dev/issue/67401.
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//
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//go:linkname defaultCipherSuitesTLS13
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var defaultCipherSuitesTLS13 = []uint16{
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TLS_AES_128_GCM_SHA256,
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TLS_AES_256_GCM_SHA384,
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TLS_CHACHA20_POLY1305_SHA256,
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}
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// defaultCipherSuitesTLS13NoAES should be an internal detail,
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// but widely used packages access it using linkname.
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// Notable members of the hall of shame include:
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// - github.com/quic-go/quic-go
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// - github.com/sagernet/quic-go
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//
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// Do not remove or change the type signature.
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// See go.dev/issue/67401.
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//
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//go:linkname defaultCipherSuitesTLS13NoAES
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var defaultCipherSuitesTLS13NoAES = []uint16{
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TLS_CHACHA20_POLY1305_SHA256,
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TLS_AES_128_GCM_SHA256,
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TLS_AES_256_GCM_SHA384,
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}
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// The FIPS-only policies below match BoringSSL's ssl_policy_fips_202205.
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var defaultSupportedVersionsFIPS = []uint16{
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VersionTLS12,
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VersionTLS13,
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}
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// defaultCurvePreferencesFIPS are the FIPS-allowed curves,
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// in preference order (most preferable first).
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var defaultCurvePreferencesFIPS = []CurveID{CurveP256, CurveP384}
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// defaultSupportedSignatureAlgorithmsFIPS currently are a subset of
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// defaultSupportedSignatureAlgorithms without Ed25519 and SHA-1.
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var defaultSupportedSignatureAlgorithmsFIPS = []SignatureScheme{
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PSSWithSHA256,
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PSSWithSHA384,
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PSSWithSHA512,
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PKCS1WithSHA256,
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ECDSAWithP256AndSHA256,
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PKCS1WithSHA384,
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ECDSAWithP384AndSHA384,
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PKCS1WithSHA512,
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}
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// defaultCipherSuitesFIPS are the FIPS-allowed cipher suites.
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var defaultCipherSuitesFIPS = []uint16{
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TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
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TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
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TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
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TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
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}
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// defaultCipherSuitesTLS13FIPS are the FIPS-allowed cipher suites for TLS 1.3.
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var defaultCipherSuitesTLS13FIPS = []uint16{
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TLS_AES_128_GCM_SHA256,
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TLS_AES_256_GCM_SHA384,
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}
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