mcp-auth-proxy

MCP Auth Proxy

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Quickstart

docker run --rm -p 80:80 --net=host \
  -e EXTERNAL_URL=http://localhost \
  -e PROXY_URL=http://localhost:8080 \
  -e PASSWORD=changeme \
  -v ./data:/data \
  ghcr.io/sigbit/mcp-auth-proxy:latest

.mcp.json

{
  "mcpServers": {
    "mcp": {
      "type": "http",
      "url": "http://localhost/mcp"
    }
  }
}

Overview

MCP Auth Proxy is a secure OAuth 2.1 authentication proxy for Model Context Protocol (MCP) servers. MCP servers are expected to support not only standard OAuth 2.1 flows but also Dynamic Client support (e.g., dynamic client registration) and authentication-related .well-known metadata. On top of that, different MCP clients handle tokens differently, which makes implementation tricky.

MCP Auth Proxy sits in front of your MCP services and enforces sign-in with OAuth providers (such as Google or GitHub) or password before users can access protected MCP resources.

Note

For a simpler approach to publish local MCP servers over OAuth, consider MCP Warp, which provides an OAuth Proxy + ngrok-like service. We highly recommend considering this option as well.

🔧 Configuration

Environment Variables

OAuth Provider Setup

Google OAuth Setup

1. Go to the Google Cloud Console
2. Create a new project or select an existing one
3. Enable the Google+ API
4. Create OAuth 2.0 credentials
5. Add authorized redirect URI: {EXTERNAL_URL}/.auth/google/callback

GitHub OAuth Setup

1. Go to the Register new GitHub App
2. Set Authorization callback URL: {EXTERNAL_URL}/.auth/github/callback

🚀 Usage

Method 1: Download Binary

Download the latest binary from releases and run with command line options:

./mcp-auth-proxy \
  --external-url "http://localhost:8081" \
  --proxy-url "http://localhost:8080" \
  --google-client-id "your-google-client-id" \
  --google-client-secret "your-google-client-secret" \
  --google-allowed-users "user1@example.com,user2@example.com" \
  --github-client-id "your-github-client-id" \
  --github-client-secret "your-github-client-secret" \
  --github-allowed-users "username1,username2" \
  --password "changeme"

Method 2: Docker

docker run --rm -p 8081:8081 --net=host \
  -e EXTERNAL_URL=http://localhost:8081 \
  -e PROXY_URL=http://localhost:8080 \
  -e GOOGLE_CLIENT_ID="your-google-client-id" \
  -e GOOGLE_CLIENT_SECRET="your-google-client-secret" \
  -e GOOGLE_ALLOWED_USERS="user1@example.com,user2@example.com" \
  -e GITHUB_CLIENT_ID="your-github-client-id" \
  -e GITHUB_CLIENT_SECRET="your-github-client-secret" \
  -e GITHUB_ALLOWED_USERS="username1,username2" \
  -e PASSWORD=changeme \
  -v ./data:/data \
  ghcr.io/sigbit/mcp-auth-proxy:latest

👨‍💻 For Developers

Commit Message Guidelines

This project follows Conventional Commits specification for commit messages. This helps with automated versioning, changelog generation, and makes the commit history more readable.

Types

• feat: A new feature
• fix: A bug fix
• docs: Documentation only changes
• style: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)
• refactor: A code change that neither fixes a bug nor adds a feature
• perf: A code change that improves performance
• test: Adding missing tests or correcting existing tests
• build: Changes that affect the build system or external dependencies
• ci: Changes to our CI configuration files and scripts
• chore: Other changes that don't modify src or test files
• revert: Reverts a previous commit

Examples

feat: add GitHub OAuth provider support
fix: resolve token expiration handling
docs: update OAuth setup instructions
refactor: simplify authentication middleware
ci: add automated release workflow

Breaking Changes

Breaking changes should be indicated by a ! after the type/scope:

feat!: change authentication API to support multiple providers