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crypto/tls: improve error messages for invalid certificates and signatures

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Also, fix the alert value sent when a signature by a client certificate
is invalid in TLS 1.0-1.2.

Fixes #35190

Change-Id: I2ae1d5593dfd5ee2b4d979664aec74aab4a8a704
Reviewed-on: https://go-review.googlesource.com/c/go/+/204157
Reviewed-by: Katie Hockman <katie@golang.org>
This commit is contained in:
Filippo Valsorda 2019-10-29 16:46:26 -04:00
parent a05934639b
commit cd18da451f
9 changed files with 96 additions and 90 deletions
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49
src/crypto/tls/common.go
View file

@ -339,6 +339,38 @@ const (
ECDSAWithSHA1 SignatureScheme = 0x0203
)
// typeAndHashFromSignatureScheme returns the corresponding signature type and
// crypto.Hash for a given TLS SignatureScheme.
func typeAndHashFromSignatureScheme(signatureAlgorithm SignatureScheme) (sigType uint8, hash crypto.Hash, err error) {
switch signatureAlgorithm {
case PKCS1WithSHA1, PKCS1WithSHA256, PKCS1WithSHA384, PKCS1WithSHA512:
sigType = signaturePKCS1v15
case PSSWithSHA256, PSSWithSHA384, PSSWithSHA512:
sigType = signatureRSAPSS
case ECDSAWithSHA1, ECDSAWithP256AndSHA256, ECDSAWithP384AndSHA384, ECDSAWithP521AndSHA512:
sigType = signatureECDSA
case Ed25519:
sigType = signatureEd25519
default:
return 0, 0, fmt.Errorf("unsupported signature algorithm: %#04x", signatureAlgorithm)
}
switch signatureAlgorithm {
case PKCS1WithSHA1, ECDSAWithSHA1:
hash = crypto.SHA1
case PKCS1WithSHA256, PSSWithSHA256, ECDSAWithP256AndSHA256:
hash = crypto.SHA256
case PKCS1WithSHA384, PSSWithSHA384, ECDSAWithP384AndSHA384:
hash = crypto.SHA384
case PKCS1WithSHA512, PSSWithSHA512, ECDSAWithP521AndSHA512:
hash = crypto.SHA512
case Ed25519:
hash = directSigning
default:
return 0, 0, fmt.Errorf("unsupported signature algorithm: %#04x", signatureAlgorithm)
}
return sigType, hash, nil
}
// ClientHelloInfo contains information from a ClientHello message in order to
// guide certificate selection in the GetCertificate callback.
type ClientHelloInfo struct {
@ -1151,20 +1183,3 @@ func isSupportedSignatureAlgorithm(sigAlg SignatureScheme, supportedSignatureAlg
}
return false
}
// signatureFromSignatureScheme maps a signature algorithm to the underlying
// signature method (without hash function).
func signatureFromSignatureScheme(signatureAlgorithm SignatureScheme) uint8 {
switch signatureAlgorithm {
case PKCS1WithSHA1, PKCS1WithSHA256, PKCS1WithSHA384, PKCS1WithSHA512:
return signaturePKCS1v15
case PSSWithSHA256, PSSWithSHA384, PSSWithSHA512:
return signatureRSAPSS
case ECDSAWithSHA1, ECDSAWithP256AndSHA256, ECDSAWithP384AndSHA384, ECDSAWithP521AndSHA512:
return signatureECDSA
case Ed25519:
return signatureEd25519
default:
return 0
}
}