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Setting up Delegated Authentication with OpenID on Microsoft Azure

Before setting up the installer, you need to ensure you correctly configured Microsoft Azure Active Directory

Set up Microsoft Azure Active Directory

  • You need to create an App registration.
  • You have to select Redirect URI (optional) and set it to https://matrix.your-domain.com/_synapse/client/oidc/callback

Screenshot 2023-05-03 at 16.30.06.png

For the bridge to be able to operate correctly, navigate to API permissions, add Microsoft Graph APIs, choose Delegated Permissions and add

  • openid
  • profile

Remember to grant the admin consent for those.

To setup the installer, you'll need

  • the Application (client) ID
  • the Directory (tenant) ID
  • a secret generated from Certificates & secrets on the app.

Configure the installer

  • Allow Existing Users: if checked, it allows a user logging in via OIDC to match a pre-existing account instead of failing. This could be used if switching from password logins to OIDC.
  • Authorization Endpoint: the oauth2 authorization endpoint. Required if provider discovery is disabled.

    https://login.microsoftonline.com/<Directory (tenant) ID>/oauth2/v2.0/authorize

  • Backchannel Logout Enabled: Synapse supports receiving OpenID Connect Back-Channel Logout notifications. This lets the OpenID Connect Provider notify Synapse when a user logs out, so that Synapse can end that user session. This property has to bet set to https://your-domain/_synapse/client/oidc/backchannel_logoutin your identity provider

Screenshot 2023-05-02 at 15.39.56.png

  • Client Auth Method: auth method to use when exchanging the token. Set it to Client Secret Post or any method supported by your Idp
  • Client ID: your Application (client) ID
  • Discover: enable/disable the use of the OIDC discovery mechanism to discover endpoints
  • Idp Brand: an optional brand for this identity provider, allowing clients to style the login flow according to the identity provider in question
  • Idp ID: a string identifying your identity provider in your configuration
  • Idp Name: A user-facing name for this identity provider, which is used to offer the user a choice of login mechanisms in the Element UI. In the screenshot bellow, Idp Name is set to Azure AD

Screenshot 2023-05-04 at 10.45.23.png

  • Issuer: the OIDC issuer. Used to validate tokens and (if discovery is enabled) to discover the provider's endpoints

    https://login.microsoftonline.com/<Directory (tenant) ID>/v2.0

  • Token Endpoint: the oauth2 authorization endpoint. Required if provider discovery is disabled.
  • Client Secret: your secret value defined under "Certificates and secrets"

Screenshot 2023-05-03 at 15.20.20.png

  • Scopes: add every scope on a different line
    • The openid scope is required which translates to the Sign you in permission in the consent UI
    • You might also include other scopes in this request for requesting consent.

Screenshot 2023-05-03 at 17.27.00.png

  • User Mapping Provider: Configuration for how attributes returned from a OIDC provider are mapped onto a matrix user.

    Screenshot 2023-05-11 at 11.06.39.png

    • Localpart Template: Jinja2 template for the localpart of the MXID. Set it to {{ user.preferred_username.split('@')[0] }} for Azure AD
    • Display Name Template: Jinja2 template for the display name to set on first login. If unset, no displayname will be set. Set it to {{ user.name }}for Azure AD

    Other configurations are documented here.

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