*Refactor to use message signing and track with timestamps

messages.proto

@@ -12,10 +12,14 @@ message Message {
     required Type type = 1;
     map<string, State> bootstrap = 2; // For bootstrap events
     optional bytes data = 3; // For state event
- optional bytes id = 4; // For connected and disconnected events
+    optional bytes signature = 4;
+    optional int64 timestamp = 5;
+    optional bytes id = 6; // For connected and disconnected events
 }
 
 message State {
     repeated bytes connectedTo = 1;
     optional bytes data = 2;
+    optional bytes signature = 3;
+    optional int64 timestamp = 4;
 }

package.json

@@ -6,11 +6,12 @@
     "dependencies": {
         "@lumeweb/dht-flood": "https://git.lumeweb.com/LumeWeb/dht-flood.git",
         "@protobuf-ts/plugin": "^2.8.1",
-        "@types/codecs": "^2.2.3",
+        "b4a": "^1.6.1",
-        "codecs": "^3.0.0",
         "compact-encoding": "^2.11.0",
+        "hypercore-crypto": "^3.3.0",
         "jsnetworkx": "^0.3.4",
         "lru": "^3.1.0",
+        "ordered-json": "^0.1.1",
         "protocol-buffers-encodings": "^1.2.0",
         "protomux-rpc": "^1.3.0"
     },

src/dhtOnlineBase.ts

@@ -1,8 +1,15 @@
 import EventEmitter from "events";
 // @ts-ignore
 import { DiGraph, hasPath } from "jsnetworkx";
-import codecs from "codecs";
+// @ts-ignore
+import orderedJSON from "ordered-json";
+// @ts-ignore
+import crypto from "hypercore-crypto";
+import b4a from "b4a";
 import { Message, State, Type } from "./messages.js";
+// @ts-ignore
+import sodium from "sodium-universal";
+import debug from "debug";
 
 const DEFAULT_ENCODING = "json";
 
@@ -15,9 +22,9 @@ export default class DHTOnlineBase extends EventEmitter {
   private bootstrapped: boolean;
   private graph: any;
   private connectedTo: Set<any>;
-  private encoding: codecs.Codec<any>;
+  protected swarm: any;
 
-  constructor(id: Buffer, { encoding = DEFAULT_ENCODING } = {}) {
+  constructor(id: Buffer, { swarm }: { swarm?: any } = {}) {
     super();
     if (!id) throw new TypeError("Must provide id for self");
 
@@ -26,8 +33,8 @@ export default class DHTOnlineBase extends EventEmitter {
     this.graph = new DiGraph();
     this.connectedTo = new Set();
     this._data = {};
-    this.encoding = codecs(encoding || DEFAULT_ENCODING);
     this._online = [this._maybeHexify(this.id)];
+    this.swarm = swarm;
   }
 
   private _data: {};
@@ -39,8 +46,16 @@ export default class DHTOnlineBase extends EventEmitter {
   set data(value: {}) {
     this._data = value;
 
-    this._setPeer(this.id, value);
+    const timestamp = BigInt(Date.now());
 
+    const rawData = orderedJSON.stringify(value);
+
+    const signature = crypto.sign(
+      b4a.from(`${timestamp}${rawData}`),
+      this.swarm.keyPair.secretKey
+    );
+
+    this._setPeer(this.id, value, timestamp, signature);
     this._broadcastData();
   }
 
@@ -55,7 +70,13 @@ export default class DHTOnlineBase extends EventEmitter {
   }
 
   getPeerData(id: Buffer | string) {
-    return this.graph.node.get(this._maybeHexify(id));
+    let data = this.graph.node.get(this._maybeHexify(id));
+
+    if (!data) {
+      return false;
+    }
+
+    return data?.data;
   }
 
   protected onAddPeer(id: Buffer) {
@@ -125,11 +146,19 @@ export default class DHTOnlineBase extends EventEmitter {
       throw new Error("Missing Type In Message");
     }
     if (type === Type.STATE) {
-      const { data: rawData } = decoded;
+      const { data: rawData, timestamp, signature } = decoded;
-      const data = this.encoding.decode(rawData);
+
-      this._setPeer(id, data);
+      if (
+        signature &&
+        crypto.verify(b4a.from(`${timestamp}${rawData}`), signature, id)
+      ) {
+        const data = rawData ? orderedJSON.parse(rawData) : null;
+        this._setPeer(id, data, timestamp, signature);
         this.emit("peer-data", data, id);
         this._recalculate();
+        return;
+      }
+      debug(`Invalid signature received for peer ${id}`);
     } else if (type === Type.CONNECTED) {
       const { id: toId } = decoded;
       this._addPeerConnection(id, Buffer.from(toId as Uint8Array));
@@ -162,12 +191,17 @@ export default class DHTOnlineBase extends EventEmitter {
     if (!Object.keys(rawData).length) {
       return;
     }
-    const data = this.encoding.encode(rawData);
+    const data = orderedJSON.stringify(rawData);
+    const { timestamp, signature } = this.graph.node.get(
+      this._maybeHexify(this.id)
+    );
     this.broadcast(
       Message.toBinary(
         Message.create({
           type: Type.STATE,
-          data,
+          data: b4a.from(data),
+          signature,
+          timestamp,
         })
       )
     );
@@ -177,9 +211,19 @@ export default class DHTOnlineBase extends EventEmitter {
     return this.graph.hasNode(this._maybeHexify(id));
   }
 
-  private _setPeer(id: Buffer | string, data: any) {
+  private _setPeer(
-    this.graph.addNode(this._maybeHexify(id), data);
+    id: Buffer | string,
+    data: any,
+    timestamp?: BigInt,
+    signature?: Uint8Array
+  ) {
+    this.graph.addNode(this._maybeHexify(id), {
+      timestamp,
+      signature,
+      data,
+    });
   }
+
   private _ensurePeer(id: Buffer | string) {
     id = this._maybeHexify(id);
     if (!this._hasSeenPeer(id)) {
@@ -218,18 +262,29 @@ export default class DHTOnlineBase extends EventEmitter {
     }
 
     for (const id in bootstrap) {
-      const { data, connectedTo } = bootstrap[id];
+      const { data, connectedTo, signature, timestamp } = bootstrap[id];
-      const parsedData = data ? this.encoding.decode(data) : null;
+      if (id === this.id.toString("hex")) {
+        continue;
+      }
+
+      if (
+        signature &&
+        crypto.verify(b4a.from(`${timestamp}${data}`), signature, b4a.from(id))
+      ) {
+        const parsedData = data ? orderedJSON.parse(data) : null;
         let peerData = parsedData || {};
-      if (id === this.id.toString("hex")) continue;
+
         // If we're already tracking them
         if (this._hasSeenPeer(id)) {
           // See what data we already have for them
           // Add their existing data to what we got from the bootstrap
           const existingPeerData = this.getPeerData(id);
           peerData = { ...existingPeerData, ...peerData };
+          this._setPeer(id, peerData, timestamp, signature);
+        }
+      } else {
+        debug(`Invalid signature received for peer ${id}`);
       }
-      this._setPeer(id, peerData);
       for (const connection of connectedTo) {
         this._addPeerConnection(id, Buffer.from(connection));
       }
@@ -239,14 +294,17 @@ export default class DHTOnlineBase extends EventEmitter {
 
     this._recalculate();
   }
+
   private _getBootstrapInfo() {
     const state: Bootstrap = {};
     for (const [id, rawData] of this.graph.nodes(true)) {
       const connectedTo = this.graph
         .neighbors(id)
         .map((id: string) => Buffer.from(id, "hex"));
-      const data = rawData ? this.encoding.encode(rawData) : null;
+
-      state[id] = { data, connectedTo };
+      const data = rawData ? orderedJSON.stringify(rawData?.data) : null;
+      const { timestamp = undefined, signature = undefined } = rawData;
+      state[id] = { data: b4a.from(data), connectedTo, timestamp, signature };
     }
 
     return state;
@@ -278,7 +336,7 @@ export default class DHTOnlineBase extends EventEmitter {
   }
 
   private _maybeHexify(data: Buffer | string): string {
-    if (Buffer.isBuffer(data)) {
+    if (b4a.isBuffer(data)) {
       return data.toString("hex");
     }
 

src/index.ts

@@ -5,7 +5,6 @@ const DISCONNECT_SMOOTH = 500;
 
 export default class DHTOnline extends DHTOnlineBase {
   private flood: DHTFlood;
-  private swarm: any;
 
   constructor(
     swarm: any,
@@ -15,9 +14,8 @@ export default class DHTOnline extends DHTOnlineBase {
       ...opts
     }: { id?: Buffer; data?: {}; [key: string]: any } = {}
   ) {
-    super(id, opts as any);
+    super(id, { swarm, ...(opts as any) });
     this.flood = new DHTFlood({ id, swarm, ...opts });
-    this.swarm = swarm;
 
     this.flood.on("peer-open", (peer) => this.handlePeerAdd(peer));
     this.flood.on("peer-remove", (peer) => this.handlePeerRemove(peer));

src/messages.ts

@@ -30,7 +30,15 @@ export interface Message {
      */
     data?: Uint8Array; // For state event
     /**
-     * @generated from protobuf field: optional bytes id = 4;
+     * @generated from protobuf field: optional bytes signature = 4;
+     */
+    signature?: Uint8Array;
+    /**
+     * @generated from protobuf field: optional int64 timestamp = 5;
+     */
+    timestamp?: bigint;
+    /**
+     * @generated from protobuf field: optional bytes id = 6;
      */
     id?: Uint8Array; // For connected and disconnected events
 }
@@ -46,6 +54,14 @@ export interface State {
      * @generated from protobuf field: optional bytes data = 2;
      */
     data?: Uint8Array;
+    /**
+     * @generated from protobuf field: optional bytes signature = 3;
+     */
+    signature?: Uint8Array;
+    /**
+     * @generated from protobuf field: optional int64 timestamp = 4;
+     */
+    timestamp?: bigint;
 }
 /**
  * @generated from protobuf enum Type
@@ -83,7 +99,9 @@ class Message$Type extends MessageType<Message> {
             { no: 1, name: "type", kind: "enum", T: () => ["Type", Type] },
             { no: 2, name: "bootstrap", kind: "map", K: 9 /*ScalarType.STRING*/, V: { kind: "message", T: () => State } },
             { no: 3, name: "data", kind: "scalar", opt: true, T: 12 /*ScalarType.BYTES*/ },
-            { no: 4, name: "id", kind: "scalar", opt: true, T: 12 /*ScalarType.BYTES*/ }
+            { no: 4, name: "signature", kind: "scalar", opt: true, T: 12 /*ScalarType.BYTES*/ },
+            { no: 5, name: "timestamp", kind: "scalar", opt: true, T: 3 /*ScalarType.INT64*/, L: 0 /*LongType.BIGINT*/ },
+            { no: 6, name: "id", kind: "scalar", opt: true, T: 12 /*ScalarType.BYTES*/ }
         ]);
     }
     create(value?: PartialMessage<Message>): Message {
@@ -107,7 +125,13 @@ class Message$Type extends MessageType<Message> {
                 case /* optional bytes data */ 3:
                     message.data = reader.bytes();
                     break;
-                case /* optional bytes id */ 4:
+                case /* optional bytes signature */ 4:
+                    message.signature = reader.bytes();
+                    break;
+                case /* optional int64 timestamp */ 5:
+                    message.timestamp = reader.int64().toBigInt();
+                    break;
+                case /* optional bytes id */ 6:
                     message.id = reader.bytes();
                     break;
                 default:
@@ -151,9 +175,15 @@ class Message$Type extends MessageType<Message> {
         /* optional bytes data = 3; */
         if (message.data !== undefined)
             writer.tag(3, WireType.LengthDelimited).bytes(message.data);
-        /* optional bytes id = 4; */
+        /* optional bytes signature = 4; */
+        if (message.signature !== undefined)
+            writer.tag(4, WireType.LengthDelimited).bytes(message.signature);
+        /* optional int64 timestamp = 5; */
+        if (message.timestamp !== undefined)
+            writer.tag(5, WireType.Varint).int64(message.timestamp);
+        /* optional bytes id = 6; */
         if (message.id !== undefined)
-            writer.tag(4, WireType.LengthDelimited).bytes(message.id);
+            writer.tag(6, WireType.LengthDelimited).bytes(message.id);
         let u = options.writeUnknownFields;
         if (u !== false)
             (u == true ? UnknownFieldHandler.onWrite : u)(this.typeName, message, writer);
@@ -169,7 +199,9 @@ class State$Type extends MessageType<State> {
     constructor() {
         super("State", [
             { no: 1, name: "connectedTo", kind: "scalar", repeat: 2 /*RepeatType.UNPACKED*/, T: 12 /*ScalarType.BYTES*/ },
-            { no: 2, name: "data", kind: "scalar", opt: true, T: 12 /*ScalarType.BYTES*/ }
+            { no: 2, name: "data", kind: "scalar", opt: true, T: 12 /*ScalarType.BYTES*/ },
+            { no: 3, name: "signature", kind: "scalar", opt: true, T: 12 /*ScalarType.BYTES*/ },
+            { no: 4, name: "timestamp", kind: "scalar", opt: true, T: 3 /*ScalarType.INT64*/, L: 0 /*LongType.BIGINT*/ }
         ]);
     }
     create(value?: PartialMessage<State>): State {
@@ -190,6 +222,12 @@ class State$Type extends MessageType<State> {
                 case /* optional bytes data */ 2:
                     message.data = reader.bytes();
                     break;
+                case /* optional bytes signature */ 3:
+                    message.signature = reader.bytes();
+                    break;
+                case /* optional int64 timestamp */ 4:
+                    message.timestamp = reader.int64().toBigInt();
+                    break;
                 default:
                     let u = options.readUnknownField;
                     if (u === "throw")
@@ -208,6 +246,12 @@ class State$Type extends MessageType<State> {
         /* optional bytes data = 2; */
         if (message.data !== undefined)
             writer.tag(2, WireType.LengthDelimited).bytes(message.data);
+        /* optional bytes signature = 3; */
+        if (message.signature !== undefined)
+            writer.tag(3, WireType.LengthDelimited).bytes(message.signature);
+        /* optional int64 timestamp = 4; */
+        if (message.timestamp !== undefined)
+            writer.tag(4, WireType.Varint).int64(message.timestamp);
         let u = options.writeUnknownFields;
         if (u !== false)
             (u == true ? UnknownFieldHandler.onWrite : u)(this.typeName, message, writer);