Method readClientCertificate

handshake_server_tls13.go:1145–1233

()

}

func (hs *serverHandshakeStateTLS13) readClientCertificate() error {
	c := hs.c

	if !hs.requestClientCert() {
		// Make sure the connection is still being verified whether or not
		// the server requested a client certificate.
		if c.config.VerifyConnection != nil {
			if err := c.config.VerifyConnection(c.connectionStateLocked()); err != nil {
				c.sendAlert(alertBadCertificate)
				return err
			}
		}
		return nil
	}

	// If we requested a client certificate, then the client must send a
	// certificate message. If it's empty, no CertificateVerify is sent.

	msg, err := c.readHandshake(hs.transcript)
	if err != nil {
		return err
	}

	certMsg, ok := msg.(*certificateMsgTLS13)
	if !ok {
		c.sendAlert(alertUnexpectedMessage)
		return unexpectedMessageError(certMsg, msg)
	}

	if err := c.processCertsFromClient(certMsg.certificate); err != nil {
		return err
	}

	if c.config.VerifyConnection != nil {
		if err := c.config.VerifyConnection(c.connectionStateLocked()); err != nil {
			c.sendAlert(alertBadCertificate)
			return err
		}
	}

	if len(certMsg.certificate.Certificate) != 0 {
		// certificateVerifyMsg is included in the transcript, but not until
		// after we verify the handshake signature, since the state before
		// this message was sent is used.
		msg, err = c.readHandshake(nil)
		if err != nil {
			return err
		}

		certVerify, ok := msg.(*certificateVerifyMsg)
		if !ok {
			c.sendAlert(alertUnexpectedMessage)
			return unexpectedMessageError(certVerify, msg)
		}

		// See RFC 8446, Section 4.4.3.
		// We don't use certReq.supportedSignatureAlgorithms because it would
		// require keeping the certificateRequestMsgTLS13 around in the hs.