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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"crypto"
"testing"
)
func TestSignatureSelection(t *testing.T) {
rsaCert := &Certificate{
Certificate: [][]byte{testRSACertificate},
PrivateKey: testRSAPrivateKey,
}
pkcs1Cert := &Certificate{
Certificate: [][]byte{testRSACertificate},
PrivateKey: testRSAPrivateKey,
SupportedSignatureAlgorithms: []SignatureScheme{PKCS1WithSHA1, PKCS1WithSHA256},
}
ecdsaCert := &Certificate{
Certificate: [][]byte{testP256Certificate},
PrivateKey: testP256PrivateKey,
}
ed25519Cert := &Certificate{
Certificate: [][]byte{testEd25519Certificate},
PrivateKey: testEd25519PrivateKey,
}
tests := []struct {
cert *Certificate
peerSigAlgs []SignatureScheme
tlsVersion uint16
expectedSigAlg SignatureScheme
expectedSigType uint8
expectedHash crypto.Hash
}{
{rsaCert, []SignatureScheme{PKCS1WithSHA1, PKCS1WithSHA256}, VersionTLS12, PKCS1WithSHA1, signaturePKCS1v15, crypto.SHA1},
{rsaCert, []SignatureScheme{PKCS1WithSHA512, PKCS1WithSHA1}, VersionTLS12, PKCS1WithSHA512, signaturePKCS1v15, crypto.SHA512},
{rsaCert, []SignatureScheme{PSSWithSHA256, PKCS1WithSHA256}, VersionTLS12, PSSWithSHA256, signatureRSAPSS, crypto.SHA256},
{pkcs1Cert, []SignatureScheme{PSSWithSHA256, PKCS1WithSHA256}, VersionTLS12, PKCS1WithSHA256, signaturePKCS1v15, crypto.SHA256},
{rsaCert, []SignatureScheme{PSSWithSHA384, PKCS1WithSHA1}, VersionTLS13, PSSWithSHA384, signatureRSAPSS, crypto.SHA384},
{ecdsaCert, []SignatureScheme{ECDSAWithSHA1}, VersionTLS12, ECDSAWithSHA1, signatureECDSA, crypto.SHA1},
{ecdsaCert, []SignatureScheme{ECDSAWithP256AndSHA256}, VersionTLS12, ECDSAWithP256AndSHA256, signatureECDSA, crypto.SHA256},
{ecdsaCert, []SignatureScheme{ECDSAWithP256AndSHA256}, VersionTLS13, ECDSAWithP256AndSHA256, signatureECDSA, crypto.SHA256},
{ed25519Cert, []SignatureScheme{Ed25519}, VersionTLS12, Ed25519, signatureEd25519, directSigning},
{ed25519Cert, []SignatureScheme{Ed25519}, VersionTLS13, Ed25519, signatureEd25519, directSigning},
// TLS 1.2 without signature_algorithms extension
{rsaCert, nil, VersionTLS12, PKCS1WithSHA1, signaturePKCS1v15, crypto.SHA1},
{ecdsaCert, nil, VersionTLS12, ECDSAWithSHA1, signatureECDSA, crypto.SHA1},
// TLS 1.2 does not restrict the ECDSA curve (our ecdsaCert is P-256)
{ecdsaCert, []SignatureScheme{ECDSAWithP384AndSHA384}, VersionTLS12, ECDSAWithP384AndSHA384, signatureECDSA, crypto.SHA384},
}
for testNo, test := range tests {
sigAlg, err := selectSignatureScheme(test.tlsVersion, test.cert, test.peerSigAlgs)
if err != nil {
t.Errorf("test[%d]: unexpected selectSignatureScheme error: %v", testNo, err)
}
if test.expectedSigAlg != sigAlg {
t.Errorf("test[%d]: expected signature scheme %v, got %v", testNo, test.expectedSigAlg, sigAlg)
}
sigType, hashFunc, err := typeAndHashFromSignatureScheme(sigAlg)
if err != nil {
t.Errorf("test[%d]: unexpected typeAndHashFromSignatureScheme error: %v", testNo, err)
}
if test.expectedSigType != sigType {
t.Errorf("test[%d]: expected signature algorithm %#x, got %#x", testNo, test.expectedSigType, sigType)
}
if test.expectedHash != hashFunc {
t.Errorf("test[%d]: expected hash function %#x, got %#x", testNo, test.expectedHash, hashFunc)
}
}
brokenCert := &Certificate{
Certificate: [][]byte{testRSACertificate},
PrivateKey: testRSAPrivateKey,
SupportedSignatureAlgorithms: []SignatureScheme{Ed25519},
}
badTests := []struct {
cert *Certificate
peerSigAlgs []SignatureScheme
tlsVersion uint16
}{
{rsaCert, []SignatureScheme{ECDSAWithP256AndSHA256, ECDSAWithSHA1}, VersionTLS12},
{ecdsaCert, []SignatureScheme{PKCS1WithSHA256, PKCS1WithSHA1}, VersionTLS12},
{rsaCert, []SignatureScheme{0}, VersionTLS12},
{ed25519Cert, []SignatureScheme{ECDSAWithP256AndSHA256, ECDSAWithSHA1}, VersionTLS12},
{ecdsaCert, []SignatureScheme{Ed25519}, VersionTLS12},
{brokenCert, []SignatureScheme{Ed25519}, VersionTLS12},
{brokenCert, []SignatureScheme{PKCS1WithSHA256}, VersionTLS12},
// RFC 5246, Section 7.4.1.4.1, says to only consider {sha1,ecdsa} as
// default when the extension is missing, and RFC 8422 does not update
// it. Anyway, if a stack supports Ed25519 it better support sigalgs.
{ed25519Cert, nil, VersionTLS12},
// TLS 1.3 has no default signature_algorithms.
{rsaCert, nil, VersionTLS13},
{ecdsaCert, nil, VersionTLS13},
{ed25519Cert, nil, VersionTLS13},
// Wrong curve, which TLS 1.3 checks
{ecdsaCert, []SignatureScheme{ECDSAWithP384AndSHA384}, VersionTLS13},
// TLS 1.3 does not support PKCS1v1.5 or SHA-1.
{rsaCert, []SignatureScheme{PKCS1WithSHA256}, VersionTLS13},
{pkcs1Cert, []SignatureScheme{PSSWithSHA256, PKCS1WithSHA256}, VersionTLS13},
{ecdsaCert, []SignatureScheme{ECDSAWithSHA1}, VersionTLS13},
// The key can be too small for the hash.
{rsaCert, []SignatureScheme{PSSWithSHA512}, VersionTLS12},
}
for testNo, test := range badTests {
sigAlg, err := selectSignatureScheme(test.tlsVersion, test.cert, test.peerSigAlgs)
if err == nil {
t.Errorf("test[%d]: unexpected success, got %v", testNo, sigAlg)
}
}
}
func TestLegacyTypeAndHash(t *testing.T) {
sigType, hashFunc, err := legacyTypeAndHashFromPublicKey(testRSAPrivateKey.Public())
if err != nil {
t.Errorf("RSA: unexpected error: %v", err)
}
if expectedSigType := signaturePKCS1v15; expectedSigType != sigType {
t.Errorf("RSA: expected signature type %#x, got %#x", expectedSigType, sigType)
}
if expectedHashFunc := crypto.MD5SHA1; expectedHashFunc != hashFunc {
t.Errorf("RSA: expected hash %#x, got %#x", expectedHashFunc, hashFunc)
}
sigType, hashFunc, err = legacyTypeAndHashFromPublicKey(testECDSAPrivateKey.Public())
if err != nil {
t.Errorf("ECDSA: unexpected error: %v", err)
}
if expectedSigType := signatureECDSA; expectedSigType != sigType {
t.Errorf("ECDSA: expected signature type %#x, got %#x", expectedSigType, sigType)
}
if expectedHashFunc := crypto.SHA1; expectedHashFunc != hashFunc {
t.Errorf("ECDSA: expected hash %#x, got %#x", expectedHashFunc, hashFunc)
}
// Ed25519 is not supported by TLS 1.0 and 1.1.
_, _, err = legacyTypeAndHashFromPublicKey(testEd25519PrivateKey.Public())
if err == nil {
t.Errorf("Ed25519: unexpected success")
}
}
// TestSupportedSignatureAlgorithms checks that all supportedSignatureAlgorithms
// have valid type and hash information.
func TestSupportedSignatureAlgorithms(t *testing.T) {
for _, sigAlg := range supportedSignatureAlgorithms {
sigType, hash, err := typeAndHashFromSignatureScheme(sigAlg)
if err != nil {
t.Errorf("%v: unexpected error: %v", sigAlg, err)
}
if sigType == 0 {
t.Errorf("%v: missing signature type", sigAlg)
}
if hash == 0 && sigAlg != Ed25519 {
t.Errorf("%v: missing hash", sigAlg)
}
}
}
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