Single Sign-On with Drupal: Centralized Authentication
Last updated: March 2026 · Reading time: 6 minutes
Every additional login is friction. When employees need separate credentials for the intranet, the CMS and the project management tool, they choose weak passwords or write them on sticky notes. SSO solves this by centralizing authentication.
SSO Protocols for Drupal
SAML 2.0: the enterprise standard for SSO. Drupal acts as a Service Provider and authenticates against a central Identity Provider (Azure AD, Okta, Keycloak). Proven, mature, widely supported.
OAuth 2.0 / OpenID Connect: modern protocols for web and mobile applications. OAuth handles authorization, OpenID Connect adds authentication. Ideal for customer-facing portals.
LDAP: direct connection to directory services like Active Directory. Users authenticate with their corporate credentials. Suitable for intranets and internal platforms.
Implementing SSO in Drupal
Drupal provides contrib modules for all common SSO protocols. The SAML Authentication module connects to enterprise identity providers. The OAuth/OpenID Connect modules enable social login and modern authentication flows.
arocom configures SSO including role mapping: Drupal roles are automatically assigned based on group memberships in the identity provider. An editor in Active Directory automatically becomes an editor in Drupal.
Why SSO Pays Off
Fewer helpdesk requests: password resets are the number one helpdesk ticket. With SSO, there is only one password to manage.
Higher security: one strong password with MFA instead of many weak passwords. Centralized deprovisioning when employees leave.
Better user experience: one login, all systems. No repeated authentication, no forgotten passwords.
Your next step
Want to implement SSO for your Drupal platform? The Drupal Future Check analyzes your authentication architecture and recommends the right SSO protocol.
Which SSO protocol should we use?
SAML for enterprise environments with existing identity providers (Azure AD, Okta). OAuth/OpenID Connect for customer-facing portals and modern web apps. LDAP for simple intranet scenarios. arocom advises based on your existing infrastructure.
Can SSO be retrofitted into existing Drupal projects?
Yes. SSO is implemented as a module and does not require a relaunch. Existing local users can be migrated to SSO gradually. arocom handles migration without downtime.
Does SSO work with multi-site Drupal installations?
Yes. All Drupal sites can authenticate against the same identity provider. Users log in once and have access to all connected Drupal instances.
Read more
- Password Security — Strong authentication beyond SSO
- GDPR and Drupal — Data protection in authentication
- HTTPS Migration — Encryption as a prerequisite for SSO
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