added encryption/decryption strategy

controllers/node.go

@@ -433,7 +433,7 @@ func uncordonNode(w http.ResponseWriter, r *http.Request) {
 		if err := mq.NodeUpdate(&node); err != nil {
 			logger.Log(1, "error publishing node update", err.Error())
 		}
-		if err := mq.UpdatePeers(&node); err != nil {
+		if err := mq.PublishPeerUpdate(&node); err != nil {
 			logger.Log(1, "error publishing peer update ", err.Error())
 		}
 	}()
@@ -465,7 +465,7 @@ func createEgressGateway(w http.ResponseWriter, r *http.Request) {
 		if err := mq.NodeUpdate(&node); err != nil {
 			logger.Log(1, "error publishing node update", err.Error())
 		}
-		if err := mq.UpdatePeers(&node); err != nil {
+		if err := mq.PublishPeerUpdate(&node); err != nil {
 			logger.Log(1, "error publishing peer update "+err.Error())
 		}
 	}()
@@ -491,7 +491,7 @@ func deleteEgressGateway(w http.ResponseWriter, r *http.Request) {
 		if err := mq.NodeUpdate(&node); err != nil {
 			logger.Log(1, "error publishing node update", err.Error())
 		}
-		if err := mq.UpdatePeers(&node); err != nil {
+		if err := mq.PublishPeerUpdate(&node); err != nil {
 			logger.Log(1, "error publishing peer update ", err.Error())
 		}
 	}()
@@ -516,7 +516,7 @@ func createIngressGateway(w http.ResponseWriter, r *http.Request) {
 		if err := mq.NodeUpdate(&node); err != nil {
 			logger.Log(1, "error publishing node update", err.Error())
 		}
-		if err := mq.UpdatePeers(&node); err != nil {
+		if err := mq.PublishPeerUpdate(&node); err != nil {
 			logger.Log(1, "error publishing peer update ", err.Error())
 		}
 	}()
@@ -538,7 +538,7 @@ func deleteIngressGateway(w http.ResponseWriter, r *http.Request) {
 		if err := mq.NodeUpdate(&node); err != nil {
 			logger.Log(1, "error publishing node update", err.Error())
 		}
-		if err := mq.UpdatePeers(&node); err != nil {
+		if err := mq.PublishPeerUpdate(&node); err != nil {
 			logger.Log(1, "error publishing peer update ", err.Error())
 		}
 	}()
@@ -617,7 +617,7 @@ func updateNode(w http.ResponseWriter, r *http.Request) {
 			logger.Log(1, "error publishing node update", err.Error())
 		}
 		if logic.ShouldPeersUpdate(&node, &newNode) {
-			if err := mq.UpdatePeers(&newNode); err != nil {
+			if err := mq.PublishPeerUpdate(&newNode); err != nil {
 				logger.Log(1, "error publishing peer update after node update", err.Error())
 			}
 		}

controllers/node_grpc.go

@@ -2,6 +2,8 @@ package controller
 
 import (
 	"context"
+	"crypto/rand"
+	"crypto/rsa"
 	"encoding/json"
 	"errors"
 	"strings"
@@ -11,6 +13,7 @@ import (
 	"github.com/gravitl/netmaker/logic"
 	"github.com/gravitl/netmaker/models"
 	"github.com/gravitl/netmaker/mq"
+	"github.com/gravitl/netmaker/netclient/ncutils"
 	"github.com/gravitl/netmaker/servercfg"
 )
 
@@ -75,7 +78,21 @@ func (s *NodeServiceServer) CreateNode(ctx context.Context, req *nodepb.Object)
 			Address:  server.Address,
 		}
 	}
+	// TODO consolidate functionality around files
 	node.NetworkSettings.DefaultServerAddrs = serverAddrs
+	var rsaPrivKey, keyErr = rsa.GenerateKey(rand.Reader, ncutils.KEY_SIZE)
+	if keyErr != nil {
+		return nil, keyErr
+	}
+	err = logic.StoreTrafficKey(node.ID, (*rsaPrivKey))
+	if err != nil {
+		return nil, err
+	}
+
+	node.TrafficKeys = models.TrafficKeys{
+		Mine:   node.TrafficKeys.Mine,
+		Server: rsaPrivKey.PublicKey,
+	}
 
 	err = logic.CreateNode(&node)
 	if err != nil {
@@ -103,7 +120,7 @@ func (s *NodeServiceServer) CreateNode(ctx context.Context, req *nodepb.Object)
 	logger.Log(0, "new node,", node.Name, ", added on network,"+node.Network)
 	// notify other nodes on network of new peer
 	go func() {
-		if err := mq.UpdatePeers(&node); err != nil {
+		if err := mq.PublishPeerUpdate(&node); err != nil {
 			logger.Log(0, "failed to inform peers of new node ", err.Error())
 		}
 	}()
@@ -170,7 +187,7 @@ func (s *NodeServiceServer) DeleteNode(ctx context.Context, req *nodepb.Object)
 	}
 	// notify other nodes on network of deleted peer
 	go func() {
-		if err := mq.UpdatePeers(&node); err != nil {
+		if err := mq.PublishPeerUpdate(&node); err != nil {
 			logger.Log(0, "failed to inform peers of deleted node ", err.Error())
 		}
 	}()

controllers/relay.go

@@ -34,7 +34,7 @@ func createRelay(w http.ResponseWriter, r *http.Request) {
 		if err := mq.NodeUpdate(&node); err != nil {
 			logger.Log(1, "error publishing node update", err.Error())
 		}
-		if err := mq.UpdatePeers(&node); err != nil {
+		if err := mq.PublishPeerUpdate(&node); err != nil {
 			logger.Log(1, "error publishing peer update ", err.Error())
 		}
 	}()
@@ -60,7 +60,7 @@ func deleteRelay(w http.ResponseWriter, r *http.Request) {
 		if err := mq.NodeUpdate(&node); err != nil {
 			logger.Log(1, "error publishing node update", err.Error())
 		}
-		if err := mq.UpdatePeers(&node); err != nil {
+		if err := mq.PublishPeerUpdate(&node); err != nil {
 			logger.Log(1, "error publishing peer update ", err.Error())
 		}
 	}()

database/database.go

@@ -36,13 +36,16 @@ const INT_CLIENTS_TABLE_NAME = "intclients"
 // PEERS_TABLE_NAME - peers table
 const PEERS_TABLE_NAME = "peers"
 
-// SERVERCONF_TABLE_NAME
+// SERVERCONF_TABLE_NAME - stores server conf
 const SERVERCONF_TABLE_NAME = "serverconf"
 
-// SERVER_UUID_TABLE_NAME
+// SERVER_UUID_TABLE_NAME - stores
 const SERVER_UUID_TABLE_NAME = "serveruuid"
 
-// SERVER_UUID_RECORD_KEY
+// TRAFFIC_TABLE_NAME - stores stuff to control traffic
+const TRAFFIC_TABLE_NAME = "traffic-table"
+
+// SERVER_UUID_RECORD_KEY - telemetry thing
 const SERVER_UUID_RECORD_KEY = "serveruuid"
 
 // DATABASE_FILENAME - database file name
@@ -130,6 +133,7 @@ func createTables() {
 	createTable(SERVERCONF_TABLE_NAME)
 	createTable(SERVER_UUID_TABLE_NAME)
 	createTable(GENERATED_TABLE_NAME)
+	createTable(TRAFFIC_TABLE_NAME)
 }
 
 func createTable(tableName string) error {

database/sqlite.go

@@ -30,7 +30,7 @@ var SQLITE_FUNCTIONS = map[string]interface{}{
 func initSqliteDB() error {
 	// == create db file if not present ==
 	if _, err := os.Stat("data"); os.IsNotExist(err) {
-		os.Mkdir("data", 0744)
+		os.Mkdir("data", 0700)
 	}
 	dbFilePath := filepath.Join("data", dbFilename)
 	if _, err := os.Stat(dbFilePath); os.IsNotExist(err) {

logic/traffic.go

@@ -0,0 +1,36 @@
+package logic
+
+import (
+	"crypto/rsa"
+	"encoding/json"
+
+	"github.com/gravitl/netmaker/database"
+)
+
+type trafficKey struct {
+	Key rsa.PrivateKey `json:"key" bson:"key"`
+}
+
+// RetrieveTrafficKey - retrieves key based on node
+func RetrieveTrafficKey(nodeid string) (rsa.PrivateKey, error) {
+	var record, err = database.FetchRecord(database.TRAFFIC_TABLE_NAME, nodeid)
+	if err != nil {
+		return rsa.PrivateKey{}, err
+	}
+	var result trafficKey
+	if err = json.Unmarshal([]byte(record), &result); err != nil {
+		return rsa.PrivateKey{}, err
+	}
+	return result.Key, nil
+}
+
+// StoreTrafficKey - stores key based on node
+func StoreTrafficKey(nodeid string, key rsa.PrivateKey) error {
+	var data, err = json.Marshal(trafficKey{
+		Key: key,
+	})
+	if err != nil {
+		return err
+	}
+	return database.Insert(nodeid, string(data), database.TRAFFIC_TABLE_NAME)
+}

models/node.go

@@ -76,6 +76,7 @@ type Node struct {
 	MTU                 int32       `json:"mtu" bson:"mtu" yaml:"mtu"`
 	Version             string      `json:"version" bson:"version" yaml:"version"`
 	ExcludedAddrs       []string    `json:"excludedaddrs" bson:"excludedaddrs" yaml:"excludedaddrs"`
+	TrafficKeys         TrafficKeys `json:"traffickeys" bson:"traffickeys" yaml:"traffickeys"`
 }
 
 // NodesArray - used for node sorting

models/structs.go

@@ -1,6 +1,10 @@
 package models
 
-import jwt "github.com/golang-jwt/jwt/v4"
+import (
+	"crypto/rsa"
+
+	jwt "github.com/golang-jwt/jwt/v4"
+)
 
 const PLACEHOLDER_KEY_TEXT = "ACCESS_KEY"
 const PLACEHOLDER_TOKEN_TEXT = "ACCESS_TOKEN"
@@ -175,3 +179,9 @@ type ServerAddr struct {
 	IsLeader bool   `json:"isleader" bson:"isleader" yaml:"isleader"`
 	Address  string `json:"address" bson:"address" yaml:"address"`
 }
+
+// TrafficKeys - struct to hold public keys
+type TrafficKeys struct {
+	Mine   rsa.PublicKey `json:"mine" bson:"mine" yaml:"mine"`
+	Server rsa.PublicKey `json:"server" bson:"server" yaml:"server"`
+}

mq/mq.go

@@ -3,6 +3,7 @@ package mq
 import (
 	"encoding/json"
 	"errors"
+	"fmt"
 	"log"
 	"strings"
 
@@ -40,6 +41,11 @@ var Ping mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message) {
 			logger.Log(0, record)
 			return
 		}
+		_, decryptErr := decryptMsg(node.ID, msg.Payload())
+		if decryptErr != nil {
+			logger.Log(0, "error updating node ", node.ID, err.Error())
+			return
+		}
 		node.SetLastCheckIn()
 		if err := logic.UpdateNode(&node, &node); err != nil {
 			logger.Log(0, "error updating node ", err.Error())
@@ -58,22 +64,28 @@ var UpdateNode mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message)
 			logger.Log(1, "error getting node.ID sent on ", msg.Topic(), err.Error())
 			return
 		}
+		currentNode, err := logic.GetNodeByID(id)
+		if err != nil {
+			logger.Log(1, "error getting node ", id, err.Error())
+			return
+		}
+		decrypted, decryptErr := decryptMsg(id, msg.Payload())
+		if decryptErr != nil {
+			logger.Log(1, "failed to decrypt message for node ", id, decryptErr.Error())
+			return
+		}
 		logger.Log(1, "Update Node Handler", id)
 		var newNode models.Node
-		if err := json.Unmarshal(msg.Payload(), &newNode); err != nil {
+		if err := json.Unmarshal(decrypted, &newNode); err != nil {
 			logger.Log(1, "error unmarshaling payload ", err.Error())
 			return
 		}
-		currentNode, err := logic.GetNodeByID(newNode.ID)
+
-		if err != nil {
-			logger.Log(1, "error getting node ", newNode.ID, err.Error())
-			return
-		}
 		if err := logic.UpdateNode(&currentNode, &newNode); err != nil {
 			logger.Log(1, "error saving node", err.Error())
 		}
 		if logic.ShouldPeersUpdate(&currentNode, &newNode) {
-			if err := PublishPeerUpdate(client, &newNode); err != nil {
+			if err := PublishPeerUpdate(&newNode); err != nil {
 				logger.Log(1, "error publishing peer update ", err.Error())
 				return
 			}
@@ -82,7 +94,10 @@ var UpdateNode mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message)
 }
 
 // PublishPeerUpdate --- deterines and publishes a peer update to all the peers of a node
-func PublishPeerUpdate(client mqtt.Client, newNode *models.Node) error {
+func PublishPeerUpdate(newNode *models.Node) error {
+	if !servercfg.IsMessageQueueBackend() {
+		return nil
+	}
 	networkNodes, err := logic.GetNetworkNodes(newNode.Network)
 	if err != nil {
 		logger.Log(1, "err getting Network Nodes", err.Error())
@@ -96,12 +111,11 @@ func PublishPeerUpdate(client mqtt.Client, newNode *models.Node) error {
 		}
 		data, err := json.Marshal(&peerUpdate)
 		if err != nil {
-			logger.Log(2, "error marshaling peer update ", err.Error())
+			logger.Log(2, "error marshaling peer update for node", node.ID, err.Error())
-			return err
+			continue
 		}
-		if token := client.Publish("update/peers/"+node.ID, 0, false, data); token.Wait() && token.Error() != nil {
+		if err = publish(node.ID, fmt.Sprintf("peers/%s/%s", node.Network, node.ID), data); err != nil {
-			logger.Log(2, "error publishing peer update to peer ", node.ID, token.Error().Error())
+			logger.Log(1, "failed to publish peer update for node", node.ID)
-			return err
 		}
 	}
 	return nil
@@ -118,28 +132,19 @@ func GetID(topic string) (string, error) {
 	return parts[count-1], nil
 }
 
-// UpdateNode -- publishes a node update
+// NodeUpdate -- publishes a node update
 func NodeUpdate(node *models.Node) error {
+	if !servercfg.IsMessageQueueBackend() {
+		return nil
+	}
 	logger.Log(3, "publishing node update to "+node.Name)
-	client := SetupMQTT()
-	defer client.Disconnect(250)
 	data, err := json.Marshal(node)
 	if err != nil {
 		logger.Log(2, "error marshalling node update ", err.Error())
 		return err
 	}
-	if token := client.Publish("update/"+node.ID, 0, false, data); token.Wait() && token.Error() != nil {
+	if err = publish(node.ID, fmt.Sprintf("update/%s/%s", node.Network, node.ID), data); err != nil {
-		logger.Log(2, "error publishing peer update to peer ", node.ID, token.Error().Error())
+		logger.Log(2, "error publishing node update to peer ", node.ID, err.Error())
-		return err
-	}
-	return nil
-}
-
-// UpdatePeers -- publishes a peer update to all the peers of a node
-func UpdatePeers(node *models.Node) error {
-	client := SetupMQTT()
-	defer client.Disconnect(250)
-	if err := PublishPeerUpdate(client, node); err != nil {
 		return err
 	}
 	return nil

mq/util.go

@@ -0,0 +1,39 @@
+package mq
+
+import (
+	"github.com/gravitl/netmaker/logic"
+	"github.com/gravitl/netmaker/netclient/ncutils"
+)
+
+func decryptMsg(nodeid string, msg []byte) ([]byte, error) {
+	trafficKey, trafficErr := logic.RetrieveTrafficKey(nodeid)
+	if trafficErr != nil {
+		return nil, trafficErr
+	}
+	return ncutils.DecryptWithPrivateKey(msg, &trafficKey), nil
+}
+
+func encrypt(nodeid string, dest string, msg []byte) ([]byte, error) {
+	var node, err = logic.GetNodeByID(nodeid)
+	if err != nil {
+		return nil, err
+	}
+	encrypted, encryptErr := ncutils.EncryptWithPublicKey(msg, &node.TrafficKeys.Mine)
+	if encryptErr != nil {
+		return nil, encryptErr
+	}
+	return encrypted, nil
+}
+
+func publish(nodeid string, dest string, msg []byte) error {
+	client := SetupMQTT()
+	defer client.Disconnect(250)
+	encrypted, encryptErr := encrypt(nodeid, dest, msg)
+	if encryptErr != nil {
+		return encryptErr
+	}
+	if token := client.Publish(dest, 0, false, encrypted); token.Wait() && token.Error() != nil {
+		return token.Error()
+	}
+	return nil
+}

netclient/auth/auth.go

@@ -73,7 +73,7 @@ func AutoLogin(client nodepb.NodeServiceClient, network string) error {
 		return err
 	}
 	tokenstring := []byte(res.Data)
-	err = os.WriteFile(home+"nettoken-"+network, tokenstring, 0644) // TODO: Proper permissions?
+	err = os.WriteFile(home+"nettoken-"+network, tokenstring, 0600) // TODO: Proper permissions?
 	if err != nil {
 		return err
 	}
@@ -83,8 +83,7 @@ func AutoLogin(client nodepb.NodeServiceClient, network string) error {
 // StoreSecret - stores auth secret locally
 func StoreSecret(key string, network string) error {
 	d1 := []byte(key)
-	err := os.WriteFile(ncutils.GetNetclientPathSpecific()+"secret-"+network, d1, 0644)
+	return os.WriteFile(ncutils.GetNetclientPathSpecific()+"secret-"+network, d1, 0600)
-	return err
 }
 
 // RetrieveSecret - fetches secret locally
@@ -93,6 +92,17 @@ func RetrieveSecret(network string) (string, error) {
 	return string(dat), err
 }
 
+// StoreTrafficKey - stores traffic key
+func StoreTrafficKey(key string, network string) error {
+	return os.WriteFile(ncutils.GetNetclientPathSpecific()+"traffic-"+network, []byte(key), 0600)
+}
+
+// RetrieveTrafficKey - reads traffic file locally
+func RetrieveTrafficKey(network string) (string, error) {
+	dat, err := os.ReadFile(ncutils.GetNetclientPathSpecific() + "traffic-" + network)
+	return string(dat), err
+}
+
 // Configuraion - struct for mac and pass
 type Configuration struct {
 	MacAddress string

netclient/functions/daemon.go

@@ -2,18 +2,21 @@ package functions
 
 import (
 	"context"
+	"crypto/rsa"
 	"encoding/json"
 	"fmt"
 	"log"
 	"os"
 	"os/signal"
 	"runtime"
+	"strings"
 	"sync"
 	"syscall"
 	"time"
 
 	mqtt "github.com/eclipse/paho.mqtt.golang"
 	"github.com/gravitl/netmaker/models"
+	"github.com/gravitl/netmaker/netclient/auth"
 	"github.com/gravitl/netmaker/netclient/config"
 	"github.com/gravitl/netmaker/netclient/local"
 	"github.com/gravitl/netmaker/netclient/ncutils"
@@ -88,17 +91,17 @@ func MessageQueue(ctx context.Context, network string) {
 		}
 		ncutils.Log("subscribed to all topics for debugging purposes")
 	}
-	if token := client.Subscribe("update/"+cfg.Node.ID, 0, mqtt.MessageHandler(NodeUpdate)); token.Wait() && token.Error() != nil {
+	if token := client.Subscribe(fmt.Sprintf("update/%s/%s", cfg.Node.Network, cfg.Node.ID), 0, mqtt.MessageHandler(NodeUpdate)); token.Wait() && token.Error() != nil {
 		log.Fatal(token.Error())
 	}
 	if cfg.DebugOn {
-		ncutils.Log("subscribed to node updates for node " + cfg.Node.Name + " update/" + cfg.Node.ID)
+		ncutils.Log(fmt.Sprintf("subscribed to node updates for node %s update/%s/%s \n", cfg.Node.Name, cfg.Node.Network, cfg.Node.ID))
 	}
-	if token := client.Subscribe("update/peers/"+cfg.Node.ID, 0, mqtt.MessageHandler(UpdatePeers)); token.Wait() && token.Error() != nil {
+	if token := client.Subscribe(fmt.Sprintf("peers/%s/%s", cfg.Node.Network, cfg.Node.ID), 0, mqtt.MessageHandler(UpdatePeers)); token.Wait() && token.Error() != nil {
 		log.Fatal(token.Error())
 	}
 	if cfg.DebugOn {
-		ncutils.Log("subscribed to node updates for node " + cfg.Node.Name + " update/peers/" + cfg.Node.ID)
+		ncutils.Log(fmt.Sprintf("subscribed to peer updates for node %s peers/%s/%s \n", cfg.Node.Name, cfg.Node.Network, cfg.Node.ID))
 	}
 	defer client.Disconnect(250)
 	go Checkin(ctx, &cfg, network)
@@ -119,20 +122,27 @@ func NodeUpdate(client mqtt.Client, msg mqtt.Message) {
 	go func() {
 		var newNode models.Node
 		var cfg config.ClientConfig
-		err := json.Unmarshal(msg.Payload(), &newNode)
+		var network = parseNetworkFromTopic(msg.Topic())
+		cfg.Network = network
+		cfg.ReadConfig()
+
+		data, dataErr := decryptMsg(&cfg, msg.Payload())
+		if dataErr != nil {
+			return
+		}
+		err := json.Unmarshal(data, &newNode)
 		if err != nil {
 			ncutils.Log("error unmarshalling node update data" + err.Error())
 			return
 		}
+
 		ncutils.Log("received message to update node " + newNode.Name)
 		// see if cache hit, if so skip
 		var currentMessage = read(newNode.Network, lastNodeUpdate)
-		if currentMessage == string(msg.Payload()) {
+		if currentMessage == string(data) {
 			return
 		}
-		insert(newNode.Network, lastNodeUpdate, string(msg.Payload()))
+		insert(newNode.Network, lastNodeUpdate, string(data))
-		cfg.Network = newNode.Network
-		cfg.ReadConfig()
 		//check if interface name has changed if so delete.
 		if cfg.Node.Interface != newNode.Interface {
 			if err = wireguard.RemoveConf(cfg.Node.Interface, true); err != nil {
@@ -201,21 +211,28 @@ func NodeUpdate(client mqtt.Client, msg mqtt.Message) {
 func UpdatePeers(client mqtt.Client, msg mqtt.Message) {
 	go func() {
 		var peerUpdate models.PeerUpdate
-		err := json.Unmarshal(msg.Payload(), &peerUpdate)
+		var network = parseNetworkFromTopic(msg.Topic())
+		var cfg = config.ClientConfig{}
+		cfg.Network = network
+		cfg.ReadConfig()
+
+		data, dataErr := decryptMsg(&cfg, msg.Payload())
+		if dataErr != nil {
+			return
+		}
+		err := json.Unmarshal(data, &peerUpdate)
 		if err != nil {
 			ncutils.Log("error unmarshalling peer data")
 			return
 		}
 		// see if cache hit, if so skip
 		var currentMessage = read(peerUpdate.Network, lastPeerUpdate)
-		if currentMessage == string(msg.Payload()) {
+		if currentMessage == string(data) {
 			return
 		}
-		insert(peerUpdate.Network, lastPeerUpdate, string(msg.Payload()))
+		insert(peerUpdate.Network, lastPeerUpdate, string(data))
 		ncutils.Log("update peer handler")
-		var cfg config.ClientConfig
+
-		cfg.Network = peerUpdate.Network
-		cfg.ReadConfig()
 		var shouldReSub = shouldResub(cfg.Node.NetworkSettings.DefaultServerAddrs, peerUpdate.ServerAddrs)
 		if shouldReSub {
 			Resubscribe(client, &cfg)
@@ -335,24 +352,49 @@ func PublishNodeUpdate(cfg *config.ClientConfig) {
 	if err := config.Write(cfg, cfg.Network); err != nil {
 		ncutils.Log("error saving configuration" + err.Error())
 	}
-	client := SetupMQTT(cfg)
 	data, err := json.Marshal(cfg.Node)
 	if err != nil {
 		ncutils.Log("error marshling node update " + err.Error())
 	}
-	if token := client.Publish("update/"+cfg.Node.ID, 0, false, data); token.Wait() && token.Error() != nil {
+	if err = publish(cfg, fmt.Sprintf("update/%s", cfg.Node.ID), data); err != nil {
-		ncutils.Log("error publishing endpoint update " + token.Error().Error())
+		ncutils.Log(fmt.Sprintf("error publishing endpoint update, %v \n", err))
 	}
-	client.Disconnect(250)
 }
 
 // Hello -- ping the broker to let server know node is alive and doing fine
 func Hello(cfg *config.ClientConfig, network string) {
-	client := SetupMQTT(cfg)
+	if err := publish(cfg, fmt.Sprintf("ping/%s", cfg.Node.ID), []byte("hello world!")); err != nil {
-	if token := client.Publish("ping/"+cfg.Node.ID, 2, false, "hello world!"); token.Wait() && token.Error() != nil {
+		ncutils.Log(fmt.Sprintf("error publishing ping, %v \n", err))
-		ncutils.Log("error publishing ping " + token.Error().Error())
 	}
-	client.Disconnect(250)
+}
+
+func publish(cfg *config.ClientConfig, dest string, msg []byte) error {
+	client := SetupMQTT(cfg)
+	defer client.Disconnect(250)
+	encrypted, encryptErr := ncutils.EncryptWithPublicKey(msg, &cfg.Node.TrafficKeys.Server)
+	if encryptErr != nil {
+		return encryptErr
+	}
+	if token := client.Publish(dest, 0, false, encrypted); token.Wait() && token.Error() != nil {
+		return token.Error()
+	}
+	return nil
+}
+
+func parseNetworkFromTopic(topic string) string {
+	return strings.Split(topic, "/")[1]
+}
+
+func decryptMsg(cfg *config.ClientConfig, msg []byte) ([]byte, error) {
+	diskKey, trafficErr := auth.RetrieveTrafficKey(cfg.Node.Network)
+	if trafficErr != nil {
+		return nil, trafficErr
+	}
+	var trafficKey rsa.PrivateKey
+	if err := json.Unmarshal([]byte(diskKey), &trafficKey); err != nil {
+		return nil, err
+	}
+	return ncutils.DecryptWithPrivateKey(msg, &trafficKey), nil
 }
 
 func shouldResub(currentServers, newServers []models.ServerAddr) bool {

netclient/functions/join.go

@@ -2,6 +2,8 @@ package functions
 
 import (
 	"context"
+	"crypto/rand"
+	"crypto/rsa"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -30,7 +32,6 @@ func JoinNetwork(cfg config.ClientConfig, privateKey string) error {
 	}
 
 	var err error
-	if cfg.Node.IsServer != "yes" {
 	if local.HasNetwork(cfg.Network) {
 		err := errors.New("ALREADY_INSTALLED. Netclient appears to already be installed for " + cfg.Network + ". To re-install, please remove by executing 'sudo netclient leave -n " + cfg.Network + "'. Then re-run the install command.")
 		return err
@@ -43,8 +44,16 @@ func JoinNetwork(cfg config.ClientConfig, privateKey string) error {
 	if cfg.Node.Password == "" {
 		cfg.Node.Password = ncutils.GenPass()
 	}
-		auth.StoreSecret(cfg.Node.Password, cfg.Node.Network)
+	var rsaPrivKey, errGen = rsa.GenerateKey(rand.Reader, ncutils.KEY_SIZE)
+	if errGen != nil {
+		return errGen
 	}
+	auth.StoreSecret(cfg.Node.Password, cfg.Node.Network)
+	var keyData, errKeyData = json.Marshal(&rsaPrivKey)
+	if errKeyData != nil {
+		return errKeyData
+	}
+	auth.StoreTrafficKey(string(keyData), cfg.Node.Network)
 
 	if cfg.Node.LocalRange != "" && cfg.Node.LocalAddress == "" {
 		log.Println("local vpn, getting local address from range: " + cfg.Node.LocalRange)
@@ -122,6 +131,10 @@ func JoinNetwork(cfg config.ClientConfig, privateKey string) error {
 		Endpoint:            cfg.Node.Endpoint,
 		SaveConfig:          cfg.Node.SaveConfig,
 		UDPHolePunch:        cfg.Node.UDPHolePunch,
+		TrafficKeys: models.TrafficKeys{
+			Mine:   rsaPrivKey.PublicKey,
+			Server: rsa.PublicKey{},
+		},
 	}
 
 	ncutils.Log("joining " + cfg.Network + " at " + cfg.Server.GRPCAddress)

netclient/ncutils/netclientutils.go

@@ -1,6 +1,9 @@
 package ncutils
 
 import (
+	crand "crypto/rand"
+	"crypto/rsa"
+	"crypto/sha512"
 	"crypto/tls"
 	"errors"
 	"fmt"
@@ -51,6 +54,9 @@ const NETCLIENT_DEFAULT_PORT = 51821
 // DEFAULT_GC_PERCENT - garbage collection percent
 const DEFAULT_GC_PERCENT = 10
 
+// KEY_SIZE = ideal length for keys
+const KEY_SIZE = 64
+
 // Log - logs a message
 func Log(message string) {
 	log.SetFlags(log.Flags() &^ (log.Llongfile | log.Lshortfile))
@@ -543,3 +549,27 @@ func ServerAddrSliceContains(slice []models.ServerAddr, item models.ServerAddr)
 	}
 	return false
 }
+
+// EncryptWithPublicKey encrypts data with public key
+func EncryptWithPublicKey(msg []byte, pub *rsa.PublicKey) ([]byte, error) {
+	if pub == nil {
+		return nil, errors.New("invalid public key when decrypting")
+	}
+	log.Printf("pub key size: %d \n", pub.Size())
+	hash := sha512.New()
+	ciphertext, err := rsa.EncryptOAEP(hash, crand.Reader, pub, msg, nil)
+	if err != nil {
+		return nil, err
+	}
+	return ciphertext, nil
+}
+
+// DecryptWithPrivateKey decrypts data with private key
+func DecryptWithPrivateKey(ciphertext []byte, priv *rsa.PrivateKey) []byte {
+	hash := sha512.New()
+	plaintext, err := rsa.DecryptOAEP(hash, crand.Reader, priv, ciphertext, nil)
+	if err != nil {
+		return nil
+	}
+	return plaintext
+}