majiayu000/claude-arsenal
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Keycloak Authentication
keycloak-auth
Configure cookie-based OIDC authentication with Keycloak for affolterNET.Web.Bff. Use when setting up login/logout, token refresh, or Keycloak integration.
SKILL.md
Full skill instructions
Keycloak Authentication
Configure cookie-based OIDC authentication with Keycloak.
For complete reference, see Library Guide.
Quick Start
appsettings.json
{
"affolterNET": {
"Web": {
"Auth": {
"Provider": {
"Authority": "https://keycloak.example.com/realms/myrealm",
"ClientId": "my-bff-client",
"ClientSecret": "your-client-secret"
},
"CookieAuth": {
"CookieName": ".MyApp.Auth",
"ExpireTimeSpan": "01:00:00"
}
},
"BffOptions": {
"AuthMode": "Authenticate"
}
}
}
}
Authentication Modes
| Mode | Description |
|---|---|
None | No authentication required |
Authenticate | Valid session required, no permission checks |
Authorize | Valid session + Keycloak RPT permissions required |
Login/Logout Endpoints
The BFF provides these authentication endpoints:
| Endpoint | Method | Description |
|---|---|---|
/bff/account/login | GET | Initiates OIDC login flow |
/bff/account/logout | GET/POST | Logs out user |
/bff/account/user | GET | Returns current user info |
Login with Return URL
/bff/account/login?returnUrl=/dashboard
Configuration Options
AuthProviderOptions
| Property | Description |
|---|---|
Authority | Keycloak realm URL |
ClientId | OIDC client identifier |
ClientSecret | OIDC client secret |
CookieAuthOptions
| Property | Type | Default | Description |
|---|---|---|---|
CookieName | string | .AspNetCore.Auth | Authentication cookie name |
ExpireTimeSpan | TimeSpan | 01:00:00 | Cookie expiration |
SlidingExpiration | bool | true | Extend cookie on activity |
Token Refresh
The RefreshTokenMiddleware automatically refreshes tokens:
- Checks token expiration before each request
- Refreshes when < 10 seconds until expiration
- Uses semaphore lock to prevent concurrent refreshes
- Signs out user on refresh failure
SPA Integration
The BFF returns 401 instead of redirecting to Keycloak:
// Handle 401 in your SPA
if (response.status === 401) {
window.location.href = '/bff/account/login?returnUrl=' +
encodeURIComponent(window.location.pathname);
}
Troubleshooting
Login redirects to wrong URL
- Verify
AuthorityURL is correct - Check Keycloak client redirect URIs include your app
- Ensure cookies are being set (check SameSite settings)
Token refresh fails
- Check refresh token hasn't expired
- Verify Keycloak client has offline_access scope
- Review Keycloak session timeout settings
Logout doesn't work
- Ensure Keycloak client has logout redirect URI configured
- Check if front-channel logout is enabled
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