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fix: Address code review feedback and add SSO documentation
- Remove duplicate route registration - Fix return type for OAuth callback handler - Add OAuth SSO configuration documentation - Add security comments for OAuth query parameters Co-authored-by: samanhappy <2755122+samanhappy@users.noreply.github.com>
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docs/configuration/oauth-sso.mdx
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docs/configuration/oauth-sso.mdx
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---
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title: OAuth SSO Configuration
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description: Configure OAuth 2.0 / OIDC Single Sign-On for MCPHub
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---
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# OAuth SSO Configuration
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MCPHub supports OAuth 2.0 / OIDC Single Sign-On (SSO) for enterprise authentication, allowing users to log in using their existing identity provider accounts (Google, Microsoft, GitHub, or custom OIDC providers).
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## Overview
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SSO support allows:
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- Login via major providers (Google, Microsoft, GitHub)
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- Custom OIDC provider integration
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- Auto-provisioning of new users from OAuth profiles
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- Role mapping from provider claims/groups
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- Hybrid auth (both SSO and local username/password)
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## Configuration
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Add the `oauthSSO` section to your `mcp_settings.json` under `systemConfig`:
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```json
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{
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"systemConfig": {
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"oauthSSO": {
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"enabled": true,
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"allowLocalAuth": true,
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"callbackBaseUrl": "https://your-mcphub-domain.com",
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"providers": [
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{
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"id": "google",
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"name": "Google",
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"type": "google",
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"clientId": "your-google-client-id",
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"clientSecret": "your-google-client-secret"
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},
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{
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"id": "github",
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"name": "GitHub",
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"type": "github",
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"clientId": "your-github-client-id",
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"clientSecret": "your-github-client-secret"
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},
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{
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"id": "microsoft",
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"name": "Microsoft",
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"type": "microsoft",
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"clientId": "your-microsoft-client-id",
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"clientSecret": "your-microsoft-client-secret"
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}
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]
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}
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}
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}
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```
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## Provider Configuration
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### Google
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1. Go to [Google Cloud Console](https://console.cloud.google.com/)
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2. Create a new project or select existing one
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3. Navigate to "APIs & Services" → "Credentials"
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4. Create OAuth 2.0 Client ID (Web application)
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5. Add authorized redirect URI: `https://your-domain/api/auth/sso/google/callback`
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6. Copy Client ID and Client Secret
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```json
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{
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"id": "google",
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"name": "Google",
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"type": "google",
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"clientId": "YOUR_GOOGLE_CLIENT_ID.apps.googleusercontent.com",
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"clientSecret": "YOUR_GOOGLE_CLIENT_SECRET"
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}
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```
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### GitHub
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1. Go to [GitHub Developer Settings](https://github.com/settings/developers)
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2. Click "New OAuth App"
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3. Set Authorization callback URL: `https://your-domain/api/auth/sso/github/callback`
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4. Copy Client ID and generate Client Secret
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```json
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{
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"id": "github",
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"name": "GitHub",
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"type": "github",
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"clientId": "YOUR_GITHUB_CLIENT_ID",
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"clientSecret": "YOUR_GITHUB_CLIENT_SECRET"
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}
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```
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### Microsoft (Azure AD)
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1. Go to [Azure Portal](https://portal.azure.com/) → Azure Active Directory
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2. Navigate to "App registrations" → "New registration"
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3. Add redirect URI: `https://your-domain/api/auth/sso/microsoft/callback`
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4. Under "Certificates & secrets", create a new client secret
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5. Copy Application (client) ID and client secret value
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```json
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{
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"id": "microsoft",
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"name": "Microsoft",
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"type": "microsoft",
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"clientId": "YOUR_AZURE_CLIENT_ID",
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"clientSecret": "YOUR_AZURE_CLIENT_SECRET"
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}
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```
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### Custom OIDC Provider
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For other OIDC-compatible identity providers:
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```json
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{
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"id": "custom-idp",
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"name": "Corporate SSO",
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"type": "oidc",
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"issuerUrl": "https://idp.example.com",
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"authorizationUrl": "https://idp.example.com/oauth2/authorize",
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"tokenUrl": "https://idp.example.com/oauth2/token",
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"userInfoUrl": "https://idp.example.com/oauth2/userinfo",
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"clientId": "YOUR_CLIENT_ID",
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"clientSecret": "YOUR_CLIENT_SECRET",
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"scopes": ["openid", "email", "profile"],
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"attributeMapping": {
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"username": "preferred_username",
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"email": "email",
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"name": "name"
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}
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}
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```
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## Role Mapping
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Configure automatic admin role assignment based on provider claims:
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```json
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{
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"id": "google",
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"name": "Google",
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"type": "google",
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"clientId": "...",
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"clientSecret": "...",
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"roleMapping": {
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"adminClaim": "groups",
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"adminValues": ["mcphub-admins", "engineering-leads"],
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"defaultIsAdmin": false
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}
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}
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```
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This configuration:
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- Checks the `groups` claim in the user's profile
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- Grants admin access if any value matches `mcphub-admins` or `engineering-leads`
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- Non-matching users get regular (non-admin) access
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## Configuration Options
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### Global Options
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| Option | Type | Default | Description |
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|--------|------|---------|-------------|
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| `enabled` | boolean | `false` | Enable/disable SSO globally |
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| `allowLocalAuth` | boolean | `true` | Allow local username/password auth alongside SSO |
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| `callbackBaseUrl` | string | auto-detected | Base URL for OAuth callbacks |
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### Provider Options
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| Option | Type | Required | Description |
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|--------|------|----------|-------------|
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| `id` | string | Yes | Unique identifier for the provider |
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| `name` | string | Yes | Display name shown on login page |
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| `type` | string | Yes | Provider type: `google`, `github`, `microsoft`, or `oidc` |
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| `clientId` | string | Yes | OAuth client ID from the provider |
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| `clientSecret` | string | Yes | OAuth client secret from the provider |
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| `enabled` | boolean | No | Enable/disable this specific provider (default: true) |
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| `scopes` | string[] | No | OAuth scopes to request |
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| `autoProvision` | boolean | No | Auto-create users on first SSO login (default: true) |
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| `allowLinking` | boolean | No | Allow existing users to link their accounts (default: true) |
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### Custom OIDC Options (type: "oidc")
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| Option | Type | Required | Description |
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|--------|------|----------|-------------|
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| `issuerUrl` | string | No | OIDC issuer URL for discovery |
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| `authorizationUrl` | string | Yes | OAuth authorization endpoint |
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| `tokenUrl` | string | Yes | OAuth token endpoint |
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| `userInfoUrl` | string | Yes | OIDC userinfo endpoint |
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| `attributeMapping` | object | No | Map provider claims to user attributes |
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## Security Notes
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1. **PKCE Support**: MCPHub uses PKCE (Proof Key for Code Exchange) for all providers except GitHub (which doesn't support it)
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2. **State Parameter**: A cryptographically random state is generated for each login to prevent CSRF attacks
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3. **Token Storage**: OAuth tokens from providers are not stored; only MCPHub's JWT is issued after successful authentication
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4. **Rate Limiting**: Consider implementing rate limiting at infrastructure level (reverse proxy) for SSO endpoints
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## Troubleshooting
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### Common Issues
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1. **"OAuth provider not found"**: Check that the provider is enabled and configured correctly
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2. **"Invalid or expired OAuth state"**: The login attempt took too long (>10 minutes) or was a replay attack
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3. **"Could not determine username"**: The provider didn't return expected user attributes; check `attributeMapping`
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4. **"User account not found and auto-provisioning is disabled"**: Set `autoProvision: true` or pre-create the user
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### Debug Mode
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Enable debug logging by setting the `DEBUG` environment variable:
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```bash
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DEBUG=oauth* node dist/index.js
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```
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