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crypto/tls: add support for Ed25519 certificates in TLS 1.2 and 1.3

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Support for Ed25519 certificates was added in CL 175478, this wires them
up into the TLS stack according to RFC 8422 (TLS 1.2) and RFC 8446 (TLS 1.3).

RFC 8422 also specifies support for TLS 1.0 and 1.1, and I initially
implemented that, but even OpenSSL doesn't take the complexity, so I
just dropped it. It would have required keeping a buffer of the
handshake transcript in order to do the direct Ed25519 signatures. We
effectively need to support TLS 1.2 because it shares ClientHello
signature algorithms with TLS 1.3.

While at it, reordered the advertised signature algorithms in the rough
order we would want to use them, also based on what curves have fast
constant-time implementations.

Client and client auth tests changed because of the change in advertised
signature algorithms in ClientHello and CertificateRequest.

Fixes #25355

Change-Id: I9fdd839afde4fd6b13fcbc5cc7017fd8c35085ee
Reviewed-on: https://go-review.googlesource.com/c/go/+/177698
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
This commit is contained in:
Filippo Valsorda 2019-05-16 19:13:29 -04:00
parent 6c11745f0b
commit 28958b0da6
84 changed files with 4977 additions and 3938 deletions
Download patch file Download diff file Expand all files Collapse all files

16
auth_test.go
View file

@ -6,12 +6,14 @@ package tls
import (
"crypto"
"crypto/ed25519"
"testing"
)
func TestSignatureSelection(t *testing.T) {
rsaCert := &testRSAPrivateKey.PublicKey
ecdsaCert := &testECDSAPrivateKey.PublicKey
ed25519Cert := testEd25519PrivateKey.Public().(ed25519.PublicKey)
sigsPKCS1WithSHA := []SignatureScheme{PKCS1WithSHA256, PKCS1WithSHA1}
sigsPSSWithSHA := []SignatureScheme{PSSWithSHA256, PSSWithSHA384}
sigsECDSAWithSHA := []SignatureScheme{ECDSAWithP256AndSHA256, ECDSAWithSHA1}
@ -22,7 +24,7 @@ func TestSignatureSelection(t *testing.T) {
ourSigAlgs []SignatureScheme
tlsVersion uint16
expectedSigAlg SignatureScheme // or 0 if ignored
expectedSigAlg SignatureScheme // if tlsVersion == VersionTLS12
expectedSigType uint8
expectedHash crypto.Hash
}{
@ -56,6 +58,10 @@ func TestSignatureSelection(t *testing.T) {
// RSASSA-PSS is defined in TLS 1.3 for TLS 1.2
// https://tools.ietf.org/html/draft-ietf-tls-tls13-21#page-45
{rsaCert, []SignatureScheme{PSSWithSHA256}, sigsPSSWithSHA, VersionTLS12, PSSWithSHA256, signatureRSAPSS, crypto.SHA256},
// All results are fixed for Ed25519. RFC 8422, Section 5.10.
{ed25519Cert, []SignatureScheme{Ed25519}, []SignatureScheme{ECDSAWithSHA1, Ed25519}, VersionTLS12, Ed25519, signatureEd25519, directSigning},
{ed25519Cert, nil, nil, VersionTLS12, Ed25519, signatureEd25519, directSigning},
}
for testNo, test := range tests {
@ -63,7 +69,7 @@ func TestSignatureSelection(t *testing.T) {
if err != nil {
t.Errorf("test[%d]: unexpected error: %v", testNo, err)
}
if test.expectedSigAlg != 0 && test.expectedSigAlg != sigAlg {
if test.tlsVersion == VersionTLS12 && test.expectedSigAlg != sigAlg {
t.Errorf("test[%d]: expected signature scheme %#x, got %#x", testNo, test.expectedSigAlg, sigAlg)
}
if test.expectedSigType != sigType {
@ -84,6 +90,12 @@ func TestSignatureSelection(t *testing.T) {
{ecdsaCert, sigsPKCS1WithSHA, sigsPKCS1WithSHA, VersionTLS12},
{ecdsaCert, sigsECDSAWithSHA, sigsPKCS1WithSHA, VersionTLS12},
{rsaCert, []SignatureScheme{0}, sigsPKCS1WithSHA, VersionTLS12},
{ed25519Cert, sigsECDSAWithSHA, sigsECDSAWithSHA, VersionTLS12},
{ed25519Cert, []SignatureScheme{Ed25519}, sigsECDSAWithSHA, VersionTLS12},
{ecdsaCert, []SignatureScheme{Ed25519}, []SignatureScheme{Ed25519}, VersionTLS12},
{ed25519Cert, nil, nil, VersionTLS11},
{ed25519Cert, nil, nil, VersionTLS10},
{ed25519Cert, nil, nil, VersionSSL30},
// ECDSA is unspecified for SSL 3.0 in RFC 4492.
// TODO a SSL 3.0 client cannot advertise signature_algorithms,