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SAML Introduction

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SAML Auth Filter (dgp.filter.http.auth.saml)

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English

Overview

The dgp.filter.http.auth.saml filter allows Pixiu to act as a SAML Service Provider (SP).

With this filter enabled, Pixiu can:

• expose SP metadata for IdP registration
• redirect unauthenticated browser requests to the IdP login page
• receive the SAML response on the ACS endpoint
• create a session cookie after a successful login
• forward selected SAML assertion attributes to upstream services as HTTP headers

Typical IdPs include Keycloak, Okta, and Microsoft Entra ID.

Request Flow

1. A browser requests a protected Pixiu route such as /app.
2. Pixiu checks whether the request already carries a valid SAML session cookie.
3. If no valid session exists, Pixiu redirects the browser to the IdP login page.
4. After the user signs in, the IdP posts a SAMLResponse to Pixiu's ACS endpoint.
5. Pixiu validates the assertion, creates a session cookie, and redirects the browser back to the original route.
6. Later requests continue to the upstream service, with configured SAML attributes forwarded as headers.

Minimal Configuration

http_filters:
  - name: "dgp.filter.http.auth.saml"
    config:
      entity_id: "pixiu-saml-sp"
      acs_url: "https://pixiu.example.com/saml/acs"
      metadata_url: "https://pixiu.example.com/saml/metadata"
      idp_metadata_url: "https://idp.example.com/app/metadata"
      cert_file: "/etc/pixiu/saml/sp.crt"
      key_file: "/etc/pixiu/saml/sp.key"
      rules:
        - match:
            prefix: "/app"
      forward_attributes:
        - saml_attribute: "email"
          header: "X-User-Email"
        - saml_attribute: "displayName"
          header: "X-User-Name"

Instead of idp_metadata_url, you can load IdP metadata from a local file:

idp_metadata_file: "/etc/pixiu/saml/idp-metadata.xml"

Configuration Fields

• entity_id: SP entity ID advertised by Pixiu
• acs_url: Assertion Consumer Service endpoint that receives the SAMLResponse
• metadata_url: Pixiu SP metadata endpoint shared with the IdP administrator
• idp_metadata_url: URL used by Pixiu to fetch IdP metadata
• idp_metadata_file: local metadata file, used instead of idp_metadata_url
• cert_file: SP certificate file
• key_file: SP private key file
• rules: protected path prefixes that require SAML login
• forward_attributes: mapping from SAML assertion attributes to upstream HTTP headers
• allow_idp_initiated: development-focused escape hatch for local HTTP testing when browsers drop the request-tracking cookie on the cross-site ACS POST
• err_msg: custom local reply message for SAML auth failures

Important Notes

• acs_url and metadata_url must use the same scheme and host.
• metadata_url is the SP metadata endpoint that the IdP imports.
• idp_metadata_url or idp_metadata_file is used by Pixiu to learn the IdP signing key and SSO endpoint.
• Pixiu removes client-supplied values for headers listed in forward_attributes before writing SAML-derived values.
• HTTPS is strongly recommended.

Cookie and HTTPS Behavior

SAML SP-initiated login usually depends on a request-tracking cookie surviving the cross-site POST back from the IdP to the ACS endpoint.

• Under HTTPS, Pixiu uses SameSite=None, which allows the cookie to be sent on the cross-site ACS POST.
• Under plain HTTP development, browsers typically reject the combination needed for that flow, so Pixiu falls back to the browser default cookie policy.
• For local HTTP development, you may need allow_idp_initiated: true so the ACS flow can continue without relying on strict InResponseTo validation.

In some local HTTP browser environments, the first login may not return cleanly to the original route because the request-tracking cookie is dropped on the ACS POST. In that case, the session may already have been created successfully. Revisit /app to verify the login result when testing the local sample.

Sample

A runnable sample is maintained in dubbo-go-pixiu-samples under auth/saml.