Enterprise SSO: SAML vs OpenID Connect — Which Should You Implement?

Enterprise customers may require your application to use their identity provider for authentication. Supporting that requirement means choosing SAML, OpenID Connect, or both, based on the identity systems your customers use.

What Problem Enterprise SSO Solves

Without SSO, an enterprise customer has to manage credentials for your application separately from the rest of their identity infrastructure. That means:

• IT needs a separate process to remove a departed employee’s access.
• Users manage yet another password.
• Security teams need to assess the application’s own MFA controls.

SSO moves authentication control back to the enterprise's identity provider (IdP). When a user accesses your application, they are redirected to their IdP for authentication. The IdP confirms identity and sends a verified assertion back to your application. You consume the assertion, create or update a user record, and issue a session.

Your application (the service provider in SAML, the relying party in OIDC) trusts the IdP to authenticate users. You never see passwords.

SAML vs OpenID Connect: The Core Difference

SAML (Security Assertion Markup Language) is an XML-based standard that has been in enterprise use since the early 2000s. Many enterprise IdPs support it. Assertions are XML documents signed with X.509 certificates.

OpenID Connect (OIDC) is a modern identity layer built on top of OAuth 2.0. It uses JSON and JWTs. It was designed for the web and mobile world that emerged after SAML was standardized.

Both accomplish the same thing: a user authenticates with their IdP and your application receives a verified identity assertion. The format, protocol mechanics, and implementation complexity differ significantly.

When to Use SAML

SAML is the right choice when:

• Your buyers are large enterprises with legacy IdP infrastructure. Okta, Azure AD, ADFS, PingIdentity, and many on-premises directories speak SAML natively. Check whether the customer already has a SAML configuration process they expect you to support.
• You are selling to regulated industries. Healthcare, finance, and government sectors often have existing SAML-based IdPs and prefer a protocol they already understand.
• Your buyers' IT teams expect a metadata exchange workflow. SAML uses SP and IdP metadata files. Enterprise IT teams are familiar with this setup process.

SAML implementation requires careful XML signature verification and protocol handling. Use a maintained library and test its validation behavior instead of writing your own implementation.

SAML libraries to evaluate: python-saml, onelogin/ruby-saml, node-saml for Node.js, spring-security-saml for Java.

When to Use OpenID Connect

OIDC is the right choice when:

• You are building a modern product where your buyers use Okta, Azure AD, or Google Workspace with OIDC support. Most major enterprise IdPs now support both SAML and OIDC.
• You already have OAuth 2.0 infrastructure. OIDC is an extension of OAuth 2.0. If you have built an OAuth flow, adding OIDC is incremental.
• You need SSO for mobile or SPA clients. SAML was designed for browser-based redirects and does not fit mobile native auth flows well. OIDC works naturally across web, mobile, and API contexts.
• Your team already works with JSON and JWTs. Familiar tooling may make OIDC easier to integrate and debug, though token and protocol validation still require care.

OIDC libraries to evaluate: openid-client for Node.js, authlib for Python, omniauth-openid-connect for Ruby, IdentityModel.OidcClient for .NET.

Choosing a Starting Point

If your target customers support OIDC and have no SAML requirement, start with OIDC and plan how you would add SAML.

The reasoning:

• Your team can reuse its OAuth tooling and experience.
• Most IdPs used by fast-growing companies (Okta, Azure, Google) support OIDC.
• Supporting one protocol initially reduces the integration work to maintain.
• SAML support can be added later using a library or by integrating a managed SSO solution.

If prospective customers require SAML, include it in the initial scope. Confirm their requirements before choosing a protocol.

Using a Managed SSO Provider

A third option: delegate both protocols to a managed identity service that handles SAML and OIDC translation for you. WorkOS, Auth0, and BoxyHQ’s SAML Jackson provide an abstraction layer where your application speaks a single protocol and the service handles the IdP-specific details.

The trade-offs:

• Faster time to market. You implement one integration instead of two.
• Vendor dependency and cost. These services charge per connection or per user and sit in the authentication critical path.
• Reduced control. Debugging a failed SSO login through a managed layer is less direct than owning the full stack.

For teams that need SSO in weeks and do not have the engineering bandwidth for a from-scratch implementation, managed SSO is a reasonable starting point.

What to Think About Beyond the Protocol

Regardless of protocol, decide how to handle provisioning and access lifecycle. SSO alone does not revoke existing application sessions:

• Just-in-time provisioning. When a user authenticates via SSO for the first time, your application needs to create their account from the identity assertion.
• Attribute mapping. IdPs send user attributes (email, name, department, groups) in different formats. You need to map these to your user model.
• Group-to-role mapping. Enterprise customers expect to manage access by IdP groups (e.g., everyone in the "Engineering" group gets the admin role in your app).
• Deprovisioning. When IT revokes a user in the IdP, your application needs to know. SCIM is the standard for this — a separate but related requirement.

Enterprise SSO is a product feature as much as it is a technical integration. Buyers evaluate how easy it is to configure, how the error messages look when something goes wrong, and whether your documentation matches what their IT team expects to see.

Discuss enterprise SSO integration with LinkIT.