forked from quic-go/quic-go
96 lines
2.4 KiB
Go
96 lines
2.4 KiB
Go
package crypto
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import (
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"crypto"
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"crypto/rand"
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"crypto/rsa"
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"crypto/sha256"
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"crypto/tls"
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"errors"
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"strings"
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)
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// rsaSigner stores a key and a certificate for the server proof
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type rsaSigner struct {
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config *tls.Config
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}
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// NewRSASigner loads the key and cert from files
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func NewRSASigner(tlsConfig *tls.Config) (Signer, error) {
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return &rsaSigner{config: tlsConfig}, nil
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}
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// SignServerProof signs CHLO and server config for use in the server proof
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func (kd *rsaSigner) SignServerProof(sni string, chlo []byte, serverConfigData []byte) ([]byte, error) {
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cert, err := kd.getCertForSNI(sni)
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if err != nil {
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return nil, err
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}
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key, ok := cert.PrivateKey.(*rsa.PrivateKey)
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if !ok {
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return nil, errors.New("only RSA keys are supported for now")
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}
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hash := sha256.New()
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if len(chlo) > 0 {
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// Version >= 31
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hash.Write([]byte("QUIC CHLO and server config signature\x00"))
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chloHash := sha256.Sum256(chlo)
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hash.Write([]byte{32, 0, 0, 0})
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hash.Write(chloHash[:])
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} else {
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hash.Write([]byte("QUIC server config signature\x00"))
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}
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hash.Write(serverConfigData)
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return rsa.SignPSS(
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rand.Reader,
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key,
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crypto.SHA256,
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hash.Sum(nil),
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&rsa.PSSOptions{SaltLength: 32},
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)
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}
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// GetCertsCompressed gets the certificate in the format described by the QUIC crypto doc
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func (kd *rsaSigner) GetCertsCompressed(sni string, pCommonSetHashes, pCachedHashes []byte) ([]byte, error) {
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cert, err := kd.getCertForSNI(sni)
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if err != nil {
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return nil, err
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}
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return compressChain(cert.Certificate, pCommonSetHashes, pCachedHashes)
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}
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// GetLeafCert gets the leaf certificate
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func (kd *rsaSigner) GetLeafCert(sni string) ([]byte, error) {
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cert, err := kd.getCertForSNI(sni)
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if err != nil {
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return nil, err
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}
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return cert.Certificate[0], nil
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}
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func (kd *rsaSigner) getCertForSNI(sni string) (*tls.Certificate, error) {
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if kd.config.GetCertificate != nil {
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cert, err := kd.config.GetCertificate(&tls.ClientHelloInfo{ServerName: sni})
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if err != nil {
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return nil, err
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}
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if cert != nil {
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return cert, nil
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}
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}
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if len(kd.config.NameToCertificate) != 0 {
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if cert, ok := kd.config.NameToCertificate[sni]; ok {
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return cert, nil
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}
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wildcardSNI := "*" + strings.TrimLeftFunc(sni, func(r rune) bool { return r != '.' })
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if cert, ok := kd.config.NameToCertificate[wildcardSNI]; ok {
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return cert, nil
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}
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}
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if len(kd.config.Certificates) != 0 {
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return &kd.config.Certificates[0], nil
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}
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return nil, errors.New("no matching certificate found")
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}
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