// Handle service request, req and return response over channel (ms).
// This handles the one valid service request: "SecretRequest"
// and terminates the channel after the first successful request
// which is not generally what would happen in most channels.
// Note that in the future, we might want to use grpc rather than custom
// service request/response buffers but we don't want to introduce complexity
// into this example. The single request response buffer is defined in
// taosupport/taosupport.proto.
func HandleServiceRequest(ms *util.MessageStream, serverProgramData *taosupport.TaoProgramData,
clientProgramName string, req *taosupport.SimpleMessage) (bool, error) {
// The somewhat boring secret is the corresponding simpleclient's program name || 43
secret := clientProgramName + "43"
if *req.RequestType == "SecretRequest" {
req.Data = append(req.Data, []byte(secret))
taosupport.SendResponse(ms, req)
log.Printf("HandleServiceRequest response buffer: ")
taosupport.PrintMessage(req)
return true, nil
} else {
log.Printf("HandleServiceRequest response is bad request\n")
errmsg := "BadRequest"
req.Err = &errmsg
return false, nil
}
}
func main() {
// This holds the cloudproxy specific data for simpleclient
// including the Program Cert and Program Private key.
var clientProgramData taosupport.TaoProgramData
// Make sure we zero keys when we're done.
defer taosupport.ClearTaoProgramData(&clientProgramData)
// Parse flags
flag.Parse()
serverAddr = *serverHost + ":" + *serverPort
// If TaoParadigm completes without error, clientProgramData contains all the
// Cloudproxy information needed throughout simpleclient execution.
if taosupport.TaoParadigm(simpleCfg, simpleClientPath, &clientProgramData) !=
nil {
log.Fatalln("simpleclient: Can't establish Tao")
}
fmt.Printf("simpleclient: TaoParadigm complete, name: %s\n",
clientProgramData.TaoName)
// Open the Tao Channel using the Program key. This program does all the
// standard channel negotiation and presents the secure server name after
// negotiation is complete.
ms, serverName, err := taosupport.OpenTaoChannel(&clientProgramData,
&serverAddr)
if err != nil {
log.Fatalln("simpleclient: Can't establish Tao Channel")
}
log.Printf("simpleclient: establish Tao Channel with %s, %s\n",
serverAddr, serverName)
// Send a simple request and get response.
// We have a simple service protobuf for requests and reponsed between
// simpleclient and simpleserver. There's only on request: tell me the
// secret.
secretRequest := "SecretRequest"
msg := new(taosupport.SimpleMessage)
msg.RequestType = &secretRequest
taosupport.SendRequest(ms, msg)
if err != nil {
log.Fatalln("simpleclient: Error in response to SendRequest\n")
}
respmsg, err := taosupport.GetResponse(ms)
if err != nil {
log.Fatalln("simpleclient: Error in response to GetResponse\n")
}
// This is the secret.
retrieveSecret := respmsg.Data[0]
// Encrypt and store the secret in simpleclient's save area.
out, err := taosupport.Protect(clientProgramData.ProgramSymKeys, retrieveSecret)
if err != nil {
log.Fatalln("simpleclient: Error protecting data\n")
}
err = ioutil.WriteFile(path.Join(*simpleClientPath,
"retrieved_secret"), out, os.ModePerm)
if err != nil {
log.Fatalln("simpleclient: error saving retrieved secret\n")
}
// Close down.
log.Printf("simpleclient: secret is %s, done\n", retrieveSecret)
}