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@agalyaramadoss agalyaramadoss on 29 Nov 7 KB first commit
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OAuth 2.1 Authorization Server - Implementation Summary

✅ Successfully Implemented

Your OAuth 2.1 Authorization Server is now fully functional and running on http://localhost:9000

🎯 Key Features Implemented

  1. OAuth 2.1 Compliance

    • ✅ PKCE (Proof Key for Code Exchange) required for all authorization code flows
    • ✅ Refresh token rotation (non-reusable tokens)
    • ✅ No implicit flow (removed for security)
    • ✅ No resource owner password flow (removed for security)
    • ✅ Exact redirect URI matching

  2. Grant Types Supported

    • ✅ Authorization Code with PKCE
    • ✅ Refresh Token (with rotation)
    • ✅ Client Credentials

  3. OpenID Connect 1.0

    • ✅ Full OIDC support
    • ✅ UserInfo endpoint
    • ✅ ID tokens (JWT)

  4. Security Features

    • ✅ JWT access tokens with RSA signatures
    • ✅ Form-based authentication
    • ✅ CSRF protection
    • ✅ H2 console (development only)

📁 Project Structure

Auth201Server/
├── src/main/java/com/heaerie/server/auth201/Auth201Server/
│   ├── Auth201ServerApplication.java          # Main application
│   ├── config/
│   │   └── SecurityConfig.java                # OAuth 2.1 security configuration
│   └── controller/
│       └── UserController.java                # Protected resources
├── src/main/resources/
│   └── application.yaml                       # Configuration
├── pom.xml                                    # Maven dependencies
├── README.md                                  # Complete documentation
├── EXAMPLES.md                                # Code examples and integrations
├── postman_collection.json                    # Postman test collection
└── test-oauth.sh                             # Bash test script

🔐 Pre-configured Clients

Public Client (SPAs/Mobile)

Client ID: public-client
Client Secret: None (public client)
PKCE: Required
Grant Types: Authorization Code, Refresh Token
Redirect URIs: 
  - http://127.0.0.1:8080/authorized
  - http://127.0.0.1:8080/login/oauth2/code/public-client
Scopes: openid, profile, email, read, write

Confidential Client (Server-to-Server)

Client ID: confidential-client
Client Secret: secret
PKCE: Required (recommended)
Grant Types: Authorization Code, Refresh Token, Client Credentials
Redirect URIs:
  - http://127.0.0.1:8080/authorized
  - http://127.0.0.1:8080/login/oauth2/code/confidential-client
Scopes: openid, profile, email, read, write

👥 Test Users

Username Password Roles
user password USER
admin admin USER, ADMIN

🔗 Available Endpoints

Endpoint URL Description
Home http://localhost:9000/ Server status
Well-Known http://localhost:9000/.well-known/oauth-authorization-server OAuth configuration
Authorization http://localhost:9000/oauth2/authorize Start OAuth flow
Token http://localhost:9000/oauth2/token Exchange codes/refresh tokens
JWK Set http://localhost:9000/oauth2/jwks Public keys for JWT verification
UserInfo http://localhost:9000/userinfo User information (requires token)
Token Introspection http://localhost:9000/oauth2/introspect Validate tokens
Token Revocation http://localhost:9000/oauth2/revoke Revoke tokens
H2 Console http://localhost:9000/h2-console Database console (dev only)

🚀 Quick Start

1. Run the Server

cd /Users/agalyaramadoss/Downloads/Auth201Server
./mvnw spring-boot:run

Server will start on: http://localhost:9000

2. Test with Bash Script

./test-oauth.sh

3. Test with Postman

Import postman_collection.json into Postman and test all flows.

4. Manual Test - Authorization Code Flow

# Generate PKCE
CODE_VERIFIER=$(openssl rand -base64 32 | tr -d '+/' | tr '=' '_' | cut -c1-43)
CODE_CHALLENGE=$(echo -n "$CODE_VERIFIER" | openssl dgst -binary -sha256 | openssl base64 | tr -d '+/' | tr '=' '_')

# Open in browser
open "http://localhost:9000/oauth2/authorize?response_type=code&client_id=public-client&redirect_uri=http://127.0.0.1:8080/authorized&scope=openid%20profile%20read&code_challenge=$CODE_CHALLENGE&code_challenge_method=S256&state=xyz"

# After login (user/password), exchange code for tokens
curl -X POST http://localhost:9000/oauth2/token \
  -H "Content-Type: application/x-www-form-urlencoded" \
  -d "grant_type=authorization_code" \
  -d "code=YOUR_CODE" \
  -d "redirect_uri=http://127.0.0.1:8080/authorized" \
  -d "client_id=public-client" \
  -d "code_verifier=$CODE_VERIFIER"

5. Test Client Credentials

curl -X POST http://localhost:9000/oauth2/token \
  -u confidential-client:secret \
  -d "grant_type=client_credentials" \
  -d "scope=read write"

📚 Documentation

  • README.md - Complete setup and usage guide
  • EXAMPLES.md - Code examples for various platforms (React, Android, iOS, Python, etc.)
  • postman_collection.json - Postman collection for API testing
  • test-oauth.sh - Automated bash test script

🔧 Technology Stack

  • Spring Boot 4.0.0 - Application framework
  • Spring Security 7.x - Security framework
  • Spring Authorization Server 7.0.0 - OAuth 2.1 implementation
  • H2 Database - In-memory database (development)
  • Java 21 - Programming language
  • Maven - Build tool

🎨 Token Configuration

Access Tokens

  • Type: JWT (JSON Web Token)
  • Signature: RS256 (RSA 2048-bit)
  • Lifetime: 15 minutes
  • Claims: sub, scope, iss, exp, iat, jti, aud

Refresh Tokens

  • Lifetime: 24 hours
  • Rotation: Enabled (OAuth 2.1 requirement)
  • Reuse: Disabled (single-use tokens)

📖 Next Steps

  1. Production Deployment

    • Replace H2 with PostgreSQL/MySQL
    • Configure HTTPS/TLS
    • Use persistent JWK keys
    • Configure proper issuer URL
    • Store clients and users in database

  2. Customization

    • Add more clients in SecurityConfig.java
    • Add more users or connect to LDAP/Active Directory
    • Customize token lifetimes
    • Add custom claims to JWT tokens
    • Implement custom consent pages

  3. Integration

    • Connect your frontend application
    • Protect your APIs with JWT tokens
    • Implement resource servers
    • Add social login providers

📝 Configuration Files

pom.xml Dependencies

- spring-boot-starter-web
- spring-boot-starter-security
- spring-security-oauth2-authorization-server
- spring-boot-starter-data-jpa
- h2database (runtime)
- commons-logging

application.yaml Settings

server.port: 9000
database: H2 in-memory
logging: DEBUG for security

🐛 Troubleshooting

Server won't start?

# Check if port 9000 is available
lsof -i :9000

# Kill existing process
kill -9 <PID>

# Rebuild
./mvnw clean install

Build errors?

# Update dependencies
./mvnw clean install -U

# Check Java version
java -version  # Should be 21+

📞 Support Resources

✨ Summary

You now have a fully functional OAuth 2.1 Authorization Server with:

  • ✅ Modern OAuth 2.1 security standards
  • ✅ PKCE enforcement for all flows
  • ✅ Refresh token rotation
  • ✅ OpenID Connect support
  • ✅ JWT access tokens
  • ✅ Production-ready architecture
  • ✅ Comprehensive documentation
  • ✅ Testing tools included

The server is ready to use for development and can be deployed to production with proper configuration! 🎉