Working with Identity Providers (IdP)
1. Understanding IdP Architecture
| Component | Role |
|---|---|
| User store | Identities + credentials |
| AuthN engine | Password, MFA, passkey verification |
| Token service | Issues JWT/SAML/opaque tokens |
| Federation broker | Bridges external IdPs |
| Admin / SCIM | Provisioning + lifecycle |
| Adaptive engine | Risk-based decisions |
2. Integrating with Auth0
| Feature | Detail |
|---|---|
| Universal Login | Hosted login page (OIDC) |
| Rules / Actions | JS hooks in token issuance |
| Management API | CRUD users, clients, connections |
| SDKs | auth0-spa-js, nextjs-auth0, java-jwt |
3. Integrating with Okta
| Feature | Detail |
|---|---|
| Org URL | https://<tenant>.okta.com |
| Sign-In Widget | Embedded customizable login |
| Authorization Server | Multiple per org for API scopes |
| Workflows | Low-code automation |
| Identity Engine | Adaptive policies, factor enrollment |
4. Integrating with Azure AD
| Aspect | Detail |
|---|---|
| Branding (2026) | Microsoft Entra ID |
| SDK | MSAL (microsoft-authentication-library) |
| App registration | Multi/single tenant, redirect URIs, secrets/certs |
| Microsoft Graph | Read user/group data with delegated scopes |
| Conditional Access | Policies enforced at token issuance |
5. Integrating with AWS Cognito
| Component | Detail |
|---|---|
| User Pool | Directory + JWT-issuing OIDC provider |
| Identity Pool | Federates identities → temporary AWS creds (STS) |
| Hosted UI | Branded login page |
| Triggers | Lambda hooks (pre-auth, pre-token, custom message) |
| Federation | SAML, OIDC, Google/Facebook/Apple/Amazon |
6. Integrating with Firebase Authentication
| Provider | Notes |
|---|---|
| Email/Password | Built-in with email verification |
| Phone | SMS OTP (reCAPTCHA-protected) |
| OAuth | Google/FB/GitHub/Apple/MS/Twitter |
| Custom tokens | Mint via Admin SDK with own backend |
| SDK | firebase-auth (web, iOS, Android) |
7. Integrating with Keycloak
| Aspect | Detail |
|---|---|
| Type | Open-source self-hosted IdP |
| Protocols | OIDC, OAuth 2.0, SAML 2.0 |
| Realms | Isolated tenant boundary |
| User federation | LDAP, AD, custom SPI |
| Adapters | JS, Spring Boot, Quarkus |
8. Configuring IdP Connections
| Element | Detail |
|---|---|
| Discovery URL | OIDC: .well-known/openid-configuration |
| Client credentials | client_id + client_secret (or private_key_jwt / mTLS) |
| Claims mapping | IdP claim → local user attribute |
| Group/role mapping | IdP group → local role |
9. Implementing Custom IdP
| Component | Build/Use |
|---|---|
| OIDC server | node-oidc-provider, ory/hydra, Spring Authorization Server |
| User mgmt | node-oidc-provider + custom adapters |
| Key management | KMS / HSM-backed JWKS rotation |
| Compliance | FAPI 2.0 for high-security profiles |
10. Handling IdP Failover
| Strategy | Detail |
|---|---|
| Multi-region | Active-active with health checks |
| Cached JWKS | Continue verification on temporary outage |
| Extended sessions | Skip re-auth during incident |
| Break-glass | Local admin accounts (vaulted creds) |
| Secondary IdP | Pre-configured failover provider |