How do I add SSO for enterprise customers?

To add SSO for enterprise customers, the standard approach is to support SAML 2.0 and/or OpenID Connect (OIDC) with an external identity provider like Okta, Azure AD / Entra ID, Google Workspace, or Ping.

What you usually need

1) Choose the SSO protocols

• SAML 2.0: Still very common in enterprise SaaS procurement.
• OIDC: Simpler to implement and increasingly preferred.
• Many products support both to maximize compatibility.

2) Build a “connection” model

For each enterprise customer, store:

• Customer/org ID
• IdP type: SAML or OIDC
• IdP issuer/entity ID
• SSO endpoints (SSO URL / authorization URL, token endpoint, metadata URL)
• Certificates or JWKS config
• Attribute mappings
• Domains associated with the customer
• Status, created/updated timestamps

3) Support IdP-initiated and SP-initiated login

• SP-initiated: user starts at your app, gets redirected to IdP, comes back authenticated.
• IdP-initiated: user starts from Okta/Azure portal and lands in your app.
• Most vendors require SP-initiated; some enterprises want both.

4) Map identity to your users

Typical flow:

• Validate SSO response/assertion
• Extract unique identity claim:
  • SAML: NameID or a stable custom attribute
  • OIDC: sub plus email/employee ID if needed
• Find or create user account
• Link user to the enterprise org
• Assign roles/groups based on claims

5) Add domain-based routing and enrollment

Common enterprise UX:

• User enters email
• If domain matches an enterprise SSO config, redirect to that IdP
• Optionally enforce SSO-only login for that domain

6) Handle provisioning separately

SSO authenticates users; it does not always provision them. For automated provisioning, support:

• SCIM 2.0 for user/group provisioning
• Role/group sync from IdP if available

7) Security essentials

• Validate signatures on SAML assertions / OIDC tokens
• Enforce audience, issuer, nonce, expiry, and clock skew checks
• Use encrypted assertions if required
• Store certs/keys securely
• Prevent account takeover by verifying email/domain ownership
• Support MFA policy on the IdP side, but don’t rely on it solely

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Recommended implementation plan

Phase 1: Minimum viable enterprise SSO

• Support OIDC
• Add organization-level IdP config
• Implement login redirect and callback flow
• Auto-link users by verified email
• Support just-in-time user creation

Phase 2: Enterprise readiness

• Add SAML 2.0
• Add domain-based SSO discovery
• Add admin UI for managing IdP config
• Add role/group mapping
• Add audit logs and SSO troubleshooting info

Phase 3: Provisioning and controls

• Add SCIM
• Add enforced SSO per domain/org
• Add session management, logout, and step-up auth
• Add certificate rotation handling and metadata refresh

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Common product requirements

Enterprise customers often ask for:

• Okta, Azure AD, Google Workspace support
• SAML metadata upload or URL
• OIDC discovery URL
• SCIM provisioning
• Enforced SSO for specific domains
• Audit logs
• Role mapping
• Multiple IdPs per tenant
• Just-in-time provisioning
• SSO test button in admin console

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Typical user flow

1. Admin configures IdP in your app.
2. User visits your login page and enters work email.
3. You detect the domain and redirect to the IdP.
4. IdP authenticates the user.
5. Your app validates the response.
6. You create/link the user and start a session.
7. Optional: SCIM keeps the account and groups in sync.

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If you want, I can help with any of these next:

• A step-by-step architecture
• SAML vs OIDC decision guidance
• A database schema for enterprise SSO
• Example implementation in Node, Python, Java, or Go
• A rollout plan for your SaaS product