mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-12-22 18:17:52 -05:00
110 lines
3.6 KiB
Go
110 lines
3.6 KiB
Go
// Copyright 2017 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 qtls
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import (
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"crypto"
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"crypto/ecdsa"
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"crypto/rsa"
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"encoding/asn1"
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"errors"
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"fmt"
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)
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// pickSignatureAlgorithm selects a signature algorithm that is compatible with
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// the given public key and the list of algorithms from both sides of connection.
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// The lists of signature algorithms (peerSigAlgs and ourSigAlgs) are ignored
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// for tlsVersion < VersionTLS12.
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//
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// The returned SignatureScheme codepoint is only meaningful for TLS 1.2 and newer
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// previous TLS versions have a fixed hash function.
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func pickSignatureAlgorithm(pubkey crypto.PublicKey, peerSigAlgs, ourSigAlgs []SignatureScheme, tlsVersion uint16) (SignatureScheme, uint8, crypto.Hash, error) {
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if tlsVersion < VersionTLS12 || len(peerSigAlgs) == 0 {
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// If the client didn't specify any signature_algorithms
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// extension then we can assume that it supports SHA1. See
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// http://tools.ietf.org/html/rfc5246#section-7.4.1.4.1
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switch pubkey.(type) {
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case *rsa.PublicKey:
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if tlsVersion < VersionTLS12 {
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return 0, signaturePKCS1v15, crypto.MD5SHA1, nil
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} else {
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return PKCS1WithSHA1, signaturePKCS1v15, crypto.SHA1, nil
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}
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case *ecdsa.PublicKey:
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return ECDSAWithSHA1, signatureECDSA, crypto.SHA1, nil
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default:
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return 0, 0, 0, fmt.Errorf("tls: unsupported public key: %T", pubkey)
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}
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}
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for _, sigAlg := range peerSigAlgs {
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if !isSupportedSignatureAlgorithm(sigAlg, ourSigAlgs) {
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continue
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}
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hashAlg, err := lookupTLSHash(sigAlg)
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if err != nil {
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panic("tls: supported signature algorithm has an unknown hash function")
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}
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sigType := signatureFromSignatureScheme(sigAlg)
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if (sigType == signaturePKCS1v15 || hashAlg == crypto.SHA1) && tlsVersion >= VersionTLS13 {
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// TLS 1.3 forbids RSASSA-PKCS1-v1_5 and SHA-1 for
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// handshake messages.
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continue
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}
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switch pubkey.(type) {
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case *rsa.PublicKey:
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if sigType == signaturePKCS1v15 || sigType == signatureRSAPSS {
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return sigAlg, sigType, hashAlg, nil
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}
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case *ecdsa.PublicKey:
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if sigType == signatureECDSA {
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return sigAlg, sigType, hashAlg, nil
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}
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}
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}
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return 0, 0, 0, errors.New("tls: peer doesn't support any common signature algorithms")
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}
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// verifyHandshakeSignature verifies a signature against pre-hashed handshake
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// contents.
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func verifyHandshakeSignature(sigType uint8, pubkey crypto.PublicKey, hashFunc crypto.Hash, digest, sig []byte) error {
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switch sigType {
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case signatureECDSA:
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pubKey, ok := pubkey.(*ecdsa.PublicKey)
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if !ok {
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return errors.New("tls: ECDSA signing requires a ECDSA public key")
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}
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ecdsaSig := new(ecdsaSignature)
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if _, err := asn1.Unmarshal(sig, ecdsaSig); err != nil {
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return err
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}
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if ecdsaSig.R.Sign() <= 0 || ecdsaSig.S.Sign() <= 0 {
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return errors.New("tls: ECDSA signature contained zero or negative values")
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}
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if !ecdsa.Verify(pubKey, digest, ecdsaSig.R, ecdsaSig.S) {
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return errors.New("tls: ECDSA verification failure")
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}
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case signaturePKCS1v15:
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pubKey, ok := pubkey.(*rsa.PublicKey)
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if !ok {
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return errors.New("tls: RSA signing requires a RSA public key")
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}
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if err := rsa.VerifyPKCS1v15(pubKey, hashFunc, digest, sig); err != nil {
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return err
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}
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case signatureRSAPSS:
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pubKey, ok := pubkey.(*rsa.PublicKey)
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if !ok {
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return errors.New("tls: RSA signing requires a RSA public key")
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}
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signOpts := &rsa.PSSOptions{SaltLength: rsa.PSSSaltLengthEqualsHash}
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if err := rsa.VerifyPSS(pubKey, hashFunc, digest, sig, signOpts); err != nil {
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return err
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}
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default:
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return errors.New("tls: unknown signature algorithm")
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}
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return nil
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}
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