🔑 Authentication and Logging 📝

- Added optional debug configuration to `config.yaml` for logging levels.
- Implemented Basic and Bearer token authentication methods in the gateway.
- Updated `README.md` to include new authentication features and examples.
- Integrated Winston for structured logging with customizable log levels.
- Modified server command execution for Puppeteer and added YouTube server configuration.
- Updated `package.json` and `package-lock.json` to include Winston as a dependency.

README.md

@@ -10,14 +10,52 @@ A flexible gateway server that bridges Model Context Protocol (MCP) STDIO server
 - Clean separation between server instances using session IDs
 - Automatic cleanup of server resources on connection close
 - YAML-based configuration
+- Optional Basic and Bearer token authentication
+- Configurable debug logging levels
 
 ## Purpose
 
 At the moment, most MCP servers are designed for local execution. MCP Gateway enables HTTP+SSE capable clients to interact with MCP servers running on remote machines. This addresses common deployment scenarios, such as running [LibreChat](https://github.com/LibreChat/LibreChat) in a containerized environment where certain MCP servers, like the Puppeteer server, may have limited functionality. MCP Gateway provides a robust solution for distributing MCP servers across multiple machines while maintaining seamless connectivity.
 
-## Security Warning
+## Security Features
 
-MCP Gateway does not yet provide any authentication or authorization. Run MCP Gateway only on a trusted network!
+MCP Gateway supports two authentication methods that can be enabled independently:
+
+1. Basic Authentication: Username/password pairs
+2. Bearer Token Authentication: Token-based authentication
+
+Both methods can be enabled simultaneously, and any valid authentication will grant access.
+
+### Authentication Configuration
+
+Add authentication settings to your `config.yaml`:
+
+```yaml
+auth:
+  basic:
+    enabled: true
+    credentials:
+      - username: "admin"
+        password: "your-secure-password"
+      # Add more username/password pairs as needed
+  bearer:
+    enabled: true
+    tokens:
+      - "your-secure-token"
+      # Add more tokens as needed
+```
+
+### Using Authentication
+
+#### Basic Authentication
+```bash
+curl -u username:password http://localhost:3000/serverName
+```
+
+#### Bearer Token Authentication
+```bash
+curl -H "Authorization: Bearer your-secure-token" http://localhost:3000/serverName
+```
 
 ## Installation
 
@@ -29,6 +67,31 @@ npm install
 
 The gateway is configured using a YAML file. By default, it looks for `config.yaml` in the current directory, but you can specify a different path using the `CONFIG_PATH` environment variable.
 
+### Debug Configuration
+
+The gateway uses [Winston](https://github.com/winstonjs/winston) for logging, providing rich formatting and multiple log levels:
+
+```yaml
+debug:
+  level: "info"  # Possible values: "error", "warn", "info", "debug", "verbose"
+```
+
+Log levels, from least to most verbose:
+- `error`: Only show errors
+- `warn`: Show warnings and errors
+- `info`: Show general information, warnings, and errors (default)
+- `debug`: Show debug information and all above
+- `verbose`: Show all possible logging information
+
+The logs include timestamps and are color-coded by level when viewing in a terminal. Additional metadata is included as JSON when relevant.
+
+Example log output:
+```
+2024-01-20T10:15:30.123Z [INFO]: New SSE connection for filesystem
+2024-01-20T10:15:30.124Z [DEBUG]: Server instance created with sessionId: /filesystem?sessionId=abc123
+2024-01-20T10:15:30.125Z [VERBOSE]: STDIO message received: {"type":"ready"}
+```
+
 ### Basic Configuration Example
 
 ```yaml
@@ -89,6 +152,33 @@ servers:
       - "--some-option"
 ```
 
+### Complete Configuration Example
+
+```yaml
+hostname: "0.0.0.0"
+port: 3000
+
+# Authentication configuration (optional)
+auth:
+  basic:
+    enabled: true
+    credentials:
+      - username: "admin"
+        password: "your-secure-password"
+  bearer:
+    enabled: true
+    tokens:
+      - "your-secure-token"
+
+servers:
+  filesystem:
+    command: npx
+    args:
+      - -y
+      - "@modelcontextprotocol/server-filesystem"
+      - "/path/to/root"
+```
+
 ## Running the Gateway
 
 Standard start:

config.yaml

@@ -1,22 +1,38 @@
 hostname: "0.0.0.0"  # Listen on all interfaces by default
 port: 3000
 
+# Debug configuration (optional)
+debug:
+  level: "info"  # Possible values: "error", "warn", "info", "debug", "verbose"
+
+# Authentication configuration (optional)
+# auth:
+#   basic:
+#     enabled: true
+#     credentials:
+#       - username: "admin"
+#         password: "your-secure-password"
+#   bearer:
+#     enabled: true
+#     tokens:
+#       - "your-secure-token"
+
 servers:
+  # run an MCP server with npx
   filesystem:
     command: npx
     args:
       - -y
       - "@modelcontextprotocol/server-filesystem"
       - "/home/aaron"
-    
-  git:
-    command: npx
-    args:
-      - -y
-      - "@modelcontextprotocol/server-git"
 
+  # run a an MCP server from local source
   puppeteer:
-    command: npx
+    command: tsx
     args:
-      - -y
+      - "/home/aaron/AI/MCP-Servers/src/puppeteer/index.ts"
-      - "@modelcontextprotocol/server-puppeteer"
+
+  youtube:
+    command: tsx
+    args:
+      - "/home/aaron/AI/mcp-server-youtube-transcript/src/index.ts"

package-lock.json

@@ -13,12 +13,22 @@
         "@types/node": "^22.10.2",
         "ts-node": "^10.9.1",
         "typescript": "^5.0.0",
+        "winston": "^3.17.0",
         "yaml": "^2.6.1"
       },
       "devDependencies": {
         "tsx": "^4.19.2"
       }
     },
+    "node_modules/@colors/colors": {
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+      "resolved": "https://registry.npmjs.org/@colors/colors/-/colors-1.6.0.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">=0.1.90"
+      }
+    },
     "node_modules/@cspotcode/source-map-support": {
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@@ -31,6 +41,17 @@
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+    "node_modules/@dabh/diagnostics": {
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+      "license": "MIT",
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+        "colorspace": "1.1.x",
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@@ -508,6 +529,12 @@
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@@ -580,6 +658,12 @@
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@@ -620,6 +704,18 @@
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@@ -703,6 +855,20 @@
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+      "funding": [
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+          "url": "https://github.com/sponsors/feross"
+        },
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+          "url": "https://www.patreon.com/feross"
+        },
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+          "type": "consulting",
+          "url": "https://feross.org/support"
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@@ -743,6 +971,15 @@
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       "version": "10.9.2",
       "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-10.9.2.tgz",
@@ -834,12 +1071,54 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
+      "license": "MIT"
+    },
     "node_modules/v8-compile-cache-lib": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/v8-compile-cache-lib/-/v8-compile-cache-lib-3.0.1.tgz",
       "integrity": "sha512-wa7YjyUGfNZngI/vtK0UHAN+lgDCxBPCylVXGp0zu59Fz5aiGtNXaq3DhIov063MorB+VfufLh3JlF2KdTK3xg==",
       "license": "MIT"
     },
+    "node_modules/winston": {
+      "version": "3.17.0",
+      "resolved": "https://registry.npmjs.org/winston/-/winston-3.17.0.tgz",
+      "integrity": "sha512-DLiFIXYC5fMPxaRg832S6F5mJYvePtmO5G9v9IgUFPhXm9/GkXarH/TUrBAVzhTCzAj9anE/+GjrgXp/54nOgw==",
+      "license": "MIT",
+      "dependencies": {
+        "@colors/colors": "^1.6.0",
+        "@dabh/diagnostics": "^2.0.2",
+        "async": "^3.2.3",
+        "is-stream": "^2.0.0",
+        "logform": "^2.7.0",
+        "one-time": "^1.0.0",
+        "readable-stream": "^3.4.0",
+        "safe-stable-stringify": "^2.3.1",
+        "stack-trace": "0.0.x",
+        "triple-beam": "^1.3.0",
+        "winston-transport": "^4.9.0"
+      },
+      "engines": {
+        "node": ">= 12.0.0"
+      }
+    },
+    "node_modules/winston-transport": {
+      "version": "4.9.0",
+      "resolved": "https://registry.npmjs.org/winston-transport/-/winston-transport-4.9.0.tgz",
+      "integrity": "sha512-8drMJ4rkgaPo1Me4zD/3WLfI/zPdA9o2IipKODunnGDcuqbHwjsbB79ylv04LCGGzU0xQ6vTznOMpQGaLhhm6A==",
+      "license": "MIT",
+      "dependencies": {
+        "logform": "^2.7.0",
+        "readable-stream": "^3.6.2",
+        "triple-beam": "^1.3.0"
+      },
+      "engines": {
+        "node": ">= 12.0.0"
+      }
+    },
     "node_modules/yaml": {
       "version": "2.6.1",
       "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.6.1.tgz",

package.json

@@ -14,6 +14,7 @@
     "@types/node": "^22.10.2",
     "ts-node": "^10.9.1",
     "typescript": "^5.0.0",
+    "winston": "^3.17.0",
     "yaml": "^2.6.1"
   },
   "devDependencies": {

src/gateway.ts

@@ -1,9 +1,30 @@
 import { SSEServerTransport } from "@modelcontextprotocol/sdk/server/sse.js";
 import { StdioClientTransport } from "@modelcontextprotocol/sdk/client/stdio.js";
+import { createLogger, format, transports } from 'winston';
 import { parse } from 'yaml';
 import { readFileSync } from 'fs';
 import http from "http";
 
+type LogLevel = 'error' | 'warn' | 'info' | 'debug' | 'verbose';
+
+interface DebugConfig {
+  level: LogLevel;
+}
+
+interface AuthConfig {
+  basic?: {
+    enabled: boolean;
+    credentials: Array<{
+      username: string;
+      password: string;
+    }>;
+  };
+  bearer?: {
+    enabled: boolean;
+    tokens: string[];
+  };
+}
+
 interface ServerConfig {
   command: string;
   args: string[];
@@ -13,6 +34,8 @@ interface ServerConfig {
 interface GatewayConfig {
   hostname: string;
   port: number;
+  debug?: DebugConfig;
+  auth?: AuthConfig;
   servers: Record<string, ServerConfig>;
 }
 
@@ -25,13 +48,81 @@ class MCPServer {
 
 class MCPGateway {
   private servers: Map<string, MCPServer> = new Map();
+  private logger: ReturnType<typeof createLogger>;
 
-  constructor(private config: GatewayConfig) { }
+  constructor(private config: GatewayConfig) {
+    this.logger = createLogger({
+      level: config.debug?.level || 'info',
+      format: format.combine(
+        format.timestamp(),
+        format.colorize(),
+        format.printf(({ level, message, timestamp, ...metadata }) => {
+          let msg = `${timestamp} [${level}]: ${message}`;
+          if (Object.keys(metadata).length > 0) {
+            msg += ` ${JSON.stringify(metadata)}`;
+          }
+          return msg;
+        })
+      ),
+      transports: [
+        new transports.Console()
+      ]
+    });
+  }
+
+  private authenticateRequest(req: http.IncomingMessage): boolean {
+    // If no auth config is present, allow all requests
+    if (!this.config.auth) {
+      this.logger.debug('No authentication configured, allowing request');
+      return true;
+    }
+
+    const authHeader = req.headers.authorization;
+    this.logger.verbose('Processing authentication header:', { header: authHeader });
+
+    // Check Bearer token authentication
+    if (this.config.auth.bearer?.enabled) {
+      if (authHeader?.startsWith('Bearer ')) {
+        const token = authHeader.substring(7);
+        const isValid = this.config.auth.bearer.tokens.includes(token);
+        this.logger.debug('Bearer token authentication result:', { isValid });
+        if (isValid) return true;
+      }
+    }
+
+    // Check Basic authentication
+    if (this.config.auth.basic?.enabled) {
+      if (authHeader?.startsWith('Basic ')) {
+        const base64Credentials = authHeader.substring(6);
+        const credentials = Buffer.from(base64Credentials, 'base64').toString('utf-8');
+        const [username, password] = credentials.split(':');
+
+        const validCredentials = this.config.auth.basic.credentials.some(
+          cred => cred.username === username && cred.password === password
+        );
+        
+        this.logger.debug('Basic authentication result:', { validCredentials });
+        if (validCredentials) return true;
+      }
+    }
+
+    this.logger.warn('Authentication failed for request');
+    return false;
+  }
 
   async start() {
     const httpServer = http.createServer(async (req, res) => {
+      // Check authentication first
+      if (!this.authenticateRequest(req)) {
+        this.logger.warn('Unauthorized request rejected');
+        res.writeHead(401, {
+          'WWW-Authenticate': 'Basic realm="MCP Gateway", Bearer'
+        }).end('Unauthorized');
+        return;
+      }
+
       const serverName = req.url?.split('/')[1].split('?')[0] || "";
-      console.debug({
+      this.logger.debug('Incoming request:', {
         fullUrl: req.url,
         method: req.method,
         serverName,
@@ -40,14 +131,14 @@ class MCPGateway {
       });
 
       if (!serverName || !this.config.servers[serverName] || !req.url) {
-        console.log('404: Server not found or invalid URL path');
+        this.logger.warn('404: Server not found or invalid URL path');
         res.writeHead(404).end();
         return;
       }
 
       // Handle root server path - establish SSE connection
       if (req.method === "GET") {
-        console.log(`New SSE connection for ${serverName}`);
+        this.logger.info(`New SSE connection for ${serverName}`);
 
         try {
           const serverConfig = this.config.servers[serverName];
@@ -64,25 +155,27 @@ class MCPGateway {
 
           // Store server info
           this.servers.set(sessionId, server);
+          this.logger.debug(`Server instance created with sessionId: ${sessionId}`);
 
           // Bridge messages from STDIO to SSE
           server.stdioTransport.onmessage = (msg) => {
+            this.logger.verbose('STDIO -> SSE:', msg);
             sseTransport.send(msg);
           };
           
           res.on('close', () => {
-            console.log(`SSE connection closed for ${sessionId}`);
+            this.logger.info(`SSE connection closed for ${sessionId}`);
             server.sseTransport.close();
             server.stdioTransport.close();  
             this.servers.delete(sessionId);
           });
           
-          console.log(`Starting transports for ${sessionId}`);
+          this.logger.info(`Starting transports for ${sessionId}`);
           await server.stdioTransport.start();
           await server.sseTransport.start();
 
         } catch (error) {
-          console.error('Error setting up SSE connection:', error);
+          this.logger.error('Error setting up SSE connection:', error);
           res.writeHead(500).end(String(error));
         }
         return;
@@ -107,6 +200,9 @@ class MCPGateway {
           try {
             // Parse and forward message to STDIO server
             const message = JSON.parse(body);
+
+            this.logger.verbose('SSE -> STDIO:', message);
+
             await server.stdioTransport.send(message);
 
             // Send success response