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‎.gitignore‎

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# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
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# dependencies
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/node_modules
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/.pnp
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.pnp.*
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.yarn/*
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!.yarn/patches
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!.yarn/plugins
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!.yarn/releases
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!.yarn/versions
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# testing
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/coverage
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# next.js
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/.next/
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/out/
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# production
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/build
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# misc
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.DS_Store
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*.pem
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# debug
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npm-debug.log*
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yarn-debug.log*
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yarn-error.log*
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.pnpm-debug.log*
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# env files (can opt-in for committing if needed)
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.env*
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# vercel
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.vercel
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# typescript
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*.tsbuildinfo
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next-env.d.ts
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.env*.local

‎DEPLOYMENT_GUIDE.md‎

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# Deployment Guide: MCP OAuth Fixes
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## 🚀 Quick Deployment Steps
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### 1. Database Migration
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Since we added new fields to the schema, update your database:
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```bash
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# Update the database schema
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pnpm prisma db push
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# Verify the changes
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pnpm prisma studio
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```
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### 2. Deploy to Vercel
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```bash
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# Commit your changes
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git add .
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git commit -m "feat: Add MCP-compliant OAuth discovery and resource binding"
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# Push to trigger Vercel deployment
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git push origin main
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```
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### 3. Test Discovery Endpoints
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After deployment, verify the new endpoints work:
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```bash
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# Replace YOUR_DOMAIN with your actual domain
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export DOMAIN="https://mcp-oauth-sample.vercel.app"
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# Test authorization server metadata
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curl $DOMAIN/.well-known/oauth-authorization-server | jq
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# Test protected resource metadata
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curl $DOMAIN/.well-known/oauth-protected-resource | jq
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# Test registration endpoint
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curl -X POST $DOMAIN/register \
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-H "Content-Type: application/json" \
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-d '{"client_name": "Test Client", "redirect_uris": ["http://localhost:3000/callback"]}' | jq
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```
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### 4. Test MCP Authentication Flow
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```bash
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# Test unauthenticated request (should return 401 with WWW-Authenticate header)
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curl -i $DOMAIN/mcp/mcp
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# Expected response should include:
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# HTTP/1.1 401 Unauthorized
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# WWW-Authenticate: Bearer realm="...", resource_metadata="..."
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```
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## 🔧 Files Created/Modified
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### New Files:
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- ✅ `app/.well-known/oauth-authorization-server/route.ts`
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- ✅ `app/.well-known/oauth-protected-resource/route.ts`
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- ✅ `app/register/route.ts`
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- ✅ `MCP_IMPLEMENTATION_ANALYSIS.md`
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### Modified Files:
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- ✅ `prisma/schema.prisma` (added resource fields)
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- ✅ `app/mcp/[transport]/route.ts` (added WWW-Authenticate header & audience validation)
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- ✅ `app/oauth/authorize/page.tsx` (added resource parameter support)
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- ✅ `app/api/oauth/token/route.ts` (added resource parameter handling)
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## 🧪 Testing with MCP Clients
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### Cursor MCP Configuration
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Update your MCP client config to use your server:
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```json
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{
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"mcpServers": {
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"raxIT-OAuth-Sample": {
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"name": "raxIT MCP OAuth Sample",
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"url": "https://mcp-oauth-sample.vercel.app/mcp/mcp",
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"transport": "http-stream"
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}
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}
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}
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```
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### Expected Behavior:
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1. **First Request**: Client gets 401 with WWW-Authenticate header
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2. **Discovery**: Client fetches `/.well-known/oauth-protected-resource`
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3. **Server Metadata**: Client fetches `/.well-known/oauth-authorization-server`
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4. **Registration**: Client registers via `/register`
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5. **Authorization**: User consent flow via `/oauth/authorize`
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6. **Token Exchange**: Client exchanges code for access token
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7. **MCP Access**: Client uses token to access MCP endpoints
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## 🔍 Debugging Common Issues
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### Issue: Discovery endpoints return 404
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**Solution**: Make sure you've deployed all new files to Vercel
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### Issue: Database errors with new fields
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**Solution**: Run `pnpm prisma db push` to update your database schema
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### Issue: Token audience validation fails
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**Check**: Ensure your `NODE_ENV` and hostname are set correctly for protocol detection
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### Issue: CORS errors
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**Check**: All endpoints include proper CORS headers for cross-origin requests
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## 📊 Monitoring & Logs
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After deployment, monitor your Vercel function logs for:
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### Successful Flow:
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```
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[MCP] Auth header present: true
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[MCP] Access token found: true
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[MCP] Authentication successful, audience validated
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```
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### Discovery Requests:
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```
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GET /.well-known/oauth-authorization-server → 200
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GET /.well-known/oauth-protected-resource → 200
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POST /register → 200
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```
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### Failed Authentication:
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```
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[MCP] No auth header, returning 401
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[MCP] Token audience mismatch. Expected: https://... Got: https://...
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```
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## 🎯 Success Criteria
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Your implementation is working correctly when:
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- ✅ All discovery endpoints return 200 with proper JSON
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- ✅ MCP clients can complete full OAuth flow
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- ✅ Tokens are properly validated for audience
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- ✅ No more 404 errors in logs for well-known endpoints
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- ✅ MCP tools are accessible after authentication
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## 🔄 Rollback Plan
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If you encounter issues, you can rollback by:
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1. **Revert Git Changes**:
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```bash
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git revert HEAD
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git push origin main
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```
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2. **Database Rollback** (if needed):
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```bash
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# Remove new columns (optional - they won't break anything if left)
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# ALTER TABLE "AuthCode" DROP COLUMN IF EXISTS "resource";
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# ALTER TABLE "AccessToken" DROP COLUMN IF EXISTS "resource";
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```
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Your MCP OAuth implementation should now be fully compliant with the specification! 🚀

‎MCP_IMPLEMENTATION_ANALYSIS.md‎

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# MCP OAuth Implementation Analysis
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## Log Analysis Summary
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Based on your server logs, I identified several critical issues preventing proper MCP authorization flow:
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### Error Patterns from Logs:
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1. **404 errors** for discovery endpoints:
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- `/.well-known/oauth-authorization-server` → 404 (FIXED)
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- `/.well-known/oauth-protected-resource` → 404 (FIXED)
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- `/register` → 404 (FIXED)
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2. **401 errors** from MCP endpoint:
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- Missing `WWW-Authenticate` header (FIXED)
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- Incomplete token validation (IMPROVED)
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3. **Discovery failures**:
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- Clients couldn't find authorization server metadata
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- No resource server metadata available
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## Key Differences: Your Implementation vs MCP Specification
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### ✅ What You Had Right:
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- ✅ Basic OAuth 2.1 flow (authorization code + PKCE)
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- ✅ Dynamic client registration at `/api/oauth/register`
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- ✅ Proper token validation and expiry
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- ✅ Database storage for tokens and clients
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- ✅ CORS headers for API access
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- ✅ NextAuth integration for user management
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### ❌ What Was Missing (Now Fixed):
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#### 1. **Authorization Server Discovery (RFC 8414)**
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**Problem**: No `/.well-known/oauth-authorization-server` endpoint
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**Impact**: Clients couldn't discover authorization server capabilities
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**Fix**: Added metadata endpoint with:
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```json
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{
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"issuer": "https://your-domain.com",
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"authorization_endpoint": "https://your-domain.com/oauth/authorize",
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"token_endpoint": "https://your-domain.com/api/oauth/token",
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"registration_endpoint": "https://your-domain.com/api/oauth/register",
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"code_challenge_methods_supported": ["S256", "plain"],
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"resource_parameter_supported": true
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}
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```
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#### 2. **Protected Resource Metadata (RFC 9728)**
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**Problem**: No `/.well-known/oauth-protected-resource` endpoint
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**Impact**: Clients couldn't discover which authorization server protects this resource
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**Fix**: Added metadata endpoint with:
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```json
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{
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"resource": "https://your-domain.com",
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"authorization_servers": ["https://your-domain.com"],
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"mcp_endpoints": [
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"https://your-domain.com/mcp/mcp",
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"https://your-domain.com/mcp/sse"
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]
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}
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```
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#### 3. **WWW-Authenticate Header (RFC 9728)**
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**Problem**: MCP server returned 401 without proper challenge
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**Impact**: Clients couldn't discover how to authenticate
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**Fix**: Added WWW-Authenticate header on 401 responses:
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```
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WWW-Authenticate: Bearer realm="https://your-domain.com", resource_metadata="https://your-domain.com/.well-known/oauth-protected-resource"
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```
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#### 4. **Resource Parameter Support (RFC 8707)**
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**Problem**: No support for `resource` parameter in authorization/token requests
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**Impact**: Tokens not properly bound to intended audience
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**Fix**:
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- Added `resource` field to database schema
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- Updated authorization flow to capture resource parameter
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- Added token audience validation
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#### 5. **Token Audience Validation**
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**Problem**: No validation that tokens were issued for this specific MCP server
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**Impact**: Security vulnerability - tokens from other servers could be accepted
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**Fix**: Added audience validation:
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```javascript
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if (accessToken.resource && accessToken.resource !== currentResource) {
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console.log('[MCP] Token audience mismatch');
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return null;
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}
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```
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#### 6. **Registration Endpoint Path**
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**Problem**: Clients expected `/register` but you had `/api/oauth/register`
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**Impact**: Dynamic client registration failed
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**Fix**: Added redirect endpoint at `/register`
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## Security Improvements
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### Before:
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- ❌ No token audience validation
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- ❌ Missing discovery endpoints
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- ❌ No resource parameter binding
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- ❌ Inadequate 401 response headers
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### After:
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- ✅ Strict token audience validation
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- ✅ Complete OAuth discovery flow
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- ✅ Resource parameter binding (RFC 8707)
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- ✅ Proper WWW-Authenticate headers
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- ✅ MCP-compliant authorization flow
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## Database Schema Changes
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Added fields to support MCP requirements:
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```sql
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-- AuthCode table
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ALTER TABLE "AuthCode" ADD COLUMN "resource" TEXT;
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-- AccessToken table
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ALTER TABLE "AccessToken" ADD COLUMN "resource" TEXT;
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```
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## MCP Authorization Flow (Now Compliant)
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```mermaid
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sequenceDiagram
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participant C as MCP Client
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participant M as MCP Server
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participant A as Authorization Server
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C->>M: MCP request (no token)
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M->>C: 401 + WWW-Authenticate header
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C->>M: GET /.well-known/oauth-protected-resource
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M->>C: Resource metadata + authorization_servers
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C->>A: GET /.well-known/oauth-authorization-server
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A->>C: Authorization server metadata
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C->>A: POST /register (dynamic client registration)
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A->>C: client_id + client_secret
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C->>A: Authorization request + resource parameter
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A->>C: Authorization code
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C->>A: Token request + resource parameter
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A->>C: Access token (bound to resource)
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C->>M: MCP request + Authorization: Bearer token
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M->>C: MCP response (token validated for audience)
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```
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## Testing Your Implementation
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After deploying these changes, verify:
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1. **Discovery endpoints work**:
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```bash
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curl https://your-domain.com/.well-known/oauth-authorization-server
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curl https://your-domain.com/.well-known/oauth-protected-resource
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```
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2. **401 responses include WWW-Authenticate**:
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```bash
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curl -i https://your-domain.com/mcp/mcp
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```
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3. **Registration endpoint accessible**:
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```bash
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curl -X POST https://your-domain.com/register \
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-H "Content-Type: application/json" \
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-d '{"client_name": "Test", "redirect_uris": ["http://localhost:3000"]}'
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```
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## Next Steps
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1. **Deploy changes** to your Vercel instance
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2. **Run database migration**: `pnpm prisma db push`
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3. **Test with MCP client** (Cursor, Claude, etc.)
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4. **Monitor logs** for successful authorization flows
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Your implementation is now **MCP specification compliant** and should work with standard MCP clients! 🎉

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