attestedtls: new protocol

Use simple cbor-encoded protocol for clean connection
establishment and shutdown and errors and to prepare
for caching mechanism to reduce data to be sent.

Signed-off-by: Simon Ott <[email protected]>

Author: smo4201

Diff for: api/api.go

@@ -255,7 +255,7 @@ func Receive(conn net.Conn) ([]byte, uint32, error) {
 			payloadLen, MaxMsgLen)
 	}
 
-	log.Tracef("Decoded header. Type %v, length %v", TypeToString(msgType), payloadLen)
+	log.Tracef("Received header type %v. Receiving payload length %v", TypeToString(msgType), payloadLen)
 
 	// Read payload
 	payload := bytes.NewBuffer(nil)
@@ -269,8 +269,6 @@ func Receive(conn net.Conn) ([]byte, uint32, error) {
 		received += n
 		payload.Write(chunk[:n])
 
-		log.Tracef("Received chunk of %v bytes\n", n)
-
 		if received == payloadLen {
 			break
 		}

Diff for: attestedhttp/client.go

@@ -57,7 +57,7 @@ type Transport struct {
 	// as we enforce aTLS as the underlying transport protocol
 
 	// Additional aTLS parameters
-	Attest      string
+	Attest      atls.AttestSelect
 	MutualTls   bool
 	CmcAddr     string
 	CmcApi      atls.CmcApiSelect
@@ -154,7 +154,7 @@ func prepareClient(c *Client) error {
 	if c.client == nil {
 
 		// Store aTLS and CMC configuration
-		cmcConfig.Attest = atls.GetAttestMode(c.Transport.Attest)
+		cmcConfig.Attest = c.Transport.Attest
 		cmcConfig.Ca = c.Transport.Ca
 		cmcConfig.Cmc = c.Transport.Cmc
 		cmcConfig.CmcAddr = c.Transport.CmcAddr

Diff for: attestedhttp/server.go

@@ -30,7 +30,7 @@ type Server struct {
 	*http.Server
 
 	// Additional aTLS parameters
-	Attest      string
+	Attest      atls.AttestSelect
 	MutualTls   bool
 	CmcAddr     string
 	CmcApi      atls.CmcApiSelect