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109 lines
3.0 KiB
109 lines
3.0 KiB
package tls
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import (
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"context"
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gotls "crypto/tls"
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"net"
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"net/url"
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"strconv"
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utls "github.com/refraction-networking/utls"
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"google.golang.org/grpc/credentials"
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)
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// grpcUtlsInfo contains the auth information for a TLS authenticated connection.
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// It implements the AuthInfo interface.
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type grpcUtlsInfo struct {
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State utls.ConnectionState
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credentials.CommonAuthInfo
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// This API is experimental.
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SPIFFEID *url.URL
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}
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// AuthType returns the type of TLSInfo as a string.
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func (t grpcUtlsInfo) AuthType() string {
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return "utls"
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}
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// GetSecurityValue returns security info requested by channelz.
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func (t grpcUtlsInfo) GetSecurityValue() credentials.ChannelzSecurityValue {
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v := &credentials.TLSChannelzSecurityValue{
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StandardName: "0x" + strconv.FormatUint(uint64(t.State.CipherSuite), 16),
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}
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// Currently there's no way to get LocalCertificate info from tls package.
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if len(t.State.PeerCertificates) > 0 {
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v.RemoteCertificate = t.State.PeerCertificates[0].Raw
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}
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return v
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}
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// grpcUtls is the credentials required for authenticating a connection using TLS.
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type grpcUtls struct {
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config *gotls.Config
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fingerprint *utls.ClientHelloID
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}
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func (c grpcUtls) Info() credentials.ProtocolInfo {
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return credentials.ProtocolInfo{
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SecurityProtocol: "tls",
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SecurityVersion: "1.2",
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ServerName: c.config.ServerName,
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}
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}
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func (c *grpcUtls) ClientHandshake(ctx context.Context, authority string, rawConn net.Conn) (_ net.Conn, _ credentials.AuthInfo, err error) {
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// use local cfg to avoid clobbering ServerName if using multiple endpoints
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cfg := c.config.Clone()
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if cfg.ServerName == "" {
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serverName, _, err := net.SplitHostPort(authority)
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if err != nil {
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// If the authority had no host port or if the authority cannot be parsed, use it as-is.
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serverName = authority
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}
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cfg.ServerName = serverName
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}
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conn := UClient(rawConn, cfg, c.fingerprint).(*UConn)
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errChannel := make(chan error, 1)
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go func() {
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errChannel <- conn.HandshakeContext(ctx)
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close(errChannel)
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}()
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select {
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case err := <-errChannel:
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if err != nil {
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conn.Close()
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return nil, nil, err
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}
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case <-ctx.Done():
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conn.Close()
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return nil, nil, ctx.Err()
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}
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tlsInfo := grpcUtlsInfo{
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State: conn.ConnectionState(),
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CommonAuthInfo: credentials.CommonAuthInfo{
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SecurityLevel: credentials.PrivacyAndIntegrity,
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},
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}
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return conn, tlsInfo, nil
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}
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// ServerHandshake will always panic. We don't support running uTLS as server.
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func (c *grpcUtls) ServerHandshake(net.Conn) (net.Conn, credentials.AuthInfo, error) {
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panic("not available!")
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}
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func (c *grpcUtls) Clone() credentials.TransportCredentials {
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return NewGrpcUtls(c.config, c.fingerprint)
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}
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func (c *grpcUtls) OverrideServerName(serverNameOverride string) error {
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c.config.ServerName = serverNameOverride
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return nil
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}
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// NewGrpcUtls uses c to construct a TransportCredentials based on uTLS.
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func NewGrpcUtls(c *gotls.Config, fingerprint *utls.ClientHelloID) credentials.TransportCredentials {
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tc := &grpcUtls{c.Clone(), fingerprint}
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return tc
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}
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