Authentication and Single Sign-On (SSO)
Pomerium provides authentication and single sign-on (SSO) by authenticating against your identity provider (IdP).
While Pomerium itself is not an IdP, it supports conventional IdP solutions and can be configured to work with any IdP that uses the OpenID Connect (OIDC) protocol.
See identity providers for step-by-step guides on how to integrate supported IdPs with Pomerium.
Authentication with Pomerium
Pomerium speaks to your IdP to verify user identities and authenticate users to upstream applications.
After Pomerium has verified and authenticated the user, the Authentication service creates a local session with relevant session data, including OAuth and ID tokens, which Pomerium uses to authenticate and authorize users and manage Pomerium sessions.
JWT verification and upstream applications
After Pomerium’s Authentication service obtains OAuth and ID tokens and OIDC claims from your IdP, it stores that session data in the Databroker service, never leaking it to the client or the upstream application. This provides an extra layer of security, as it prevents the application from using OAuth tokens provided by the IdP.
Pomerium mints a new Pomerium JWT based on the claims and scopes in the OAuth and ID tokens and signs the JWT with a private key so the upstream application can verify the incoming request came from Pomerium.
Although JWT verification is optional, Pomerium provides a way for you to verify a user’s identity on the application level by forwarding JWT claim headers with proxied requests to upstream applications.
Pomerium offers frontend and backend SDKs to simplify JWT verification for application developers:
SSO support for legacy applications
Legacy apps that may not directly support SSO are still compatible with Pomerium. As a reverse proxy, Pomerium is designed to sit in front of your applications.
By configuring your applications to route requests to Pomerium’s Proxy service, Pomerium can manage the authentication flow and secure your legacy app with minimal to no work on your end.
External data sources (Enterprise)
Enterprise customers can enforce context-aware access with Pomerium’s external data sources feature (directory sync).
From the Enterprise Console, you can import external data from sources other than your IdP. User identity context such as users, groups, roles, language, time zones, location, and more can be included into your authorization policy so you can make granular access control decisions.