Integrate with Slack

What is Slack

Slack is a platform for collaboration, with chat and real-time video capabilities. To learn more, visit https://slack.com.

Preparation

The following placeholders are used in this guide:

• company.slack.com is the FQDN of your Slack workspace.
• authentik.company is the FQDN of the authentik installation.

:::info This documentation lists only the settings that you need to change from their default values. Be aware that any changes other than those explicitly mentioned in this guide could cause issues accessing your application. :::

For additional information about integrating with Slack, refer to their documentation.

SAML Login Integration

authentik configuration

To support the integration of Slack with authentik, you need to create an application/provider pair in authentik.

Create property mappings

1. Log in to authentik as an administrator and open the authentik Admin interface.
2. Navigate to Customization > Property Mappings and click Create. Create two SAML Provider Property Mappings with the following settings:
   • Name Mapping:
     • Name: Choose a descriptive name
     • SAML Attribute Name: User.Email
     • Friendly Name: Leave blank
     • Expression: return request.user.email
   • Email Mapping:
     • Name: Choose a descriptive name
     • SAML Attribute Name: User.Username
     • Friendly Name: Leave blank
     • Expression: return request.user.username

Create an application and provider in authentik

1. Log in to authentik as an administrator and open the authentik Admin interface.
2. Navigate to Applications > Applications and click Create with Provider to create an application and provider pair. (Alternatively you can first create a provider separately, then create the application and connect it with the provider.)

• Application: provide a descriptive name, an optional group for the type of application, the policy engine mode, and optional UI settings. Take note of the slug as it will be required later.
• Choose a Provider type: select SAML Provider as the provider type.
• Configure the Provider: provide a name (or accept the auto-provided name), the authorization flow to use for this provider, and the following required configurations.
  • Set the ACS URL to https://company.slack.com/sso/saml.
  • Set the Issuer to https://slack.com.
  • Set the Service Provider Binding to Post.
  • Under Advanced protocol settings, select an available Signing certificate and add the two Property Mappings you created in the previous section.
• Configure Bindings (optional): you can create a binding (policy, group, or user) to manage the listing and access to applications on a user's My applications page.

3. Click Submit to save the new application and provider.

Slack configuration

Configure Slack

1. Log in to the Slack Admin Dashboard.
2. Navigate to the Configure SAML Authentication page.
3. Enter the following values:
   • SAML 2.0 Endpoint (HTTP): copy/paste in the SSO URL (Redirect) URL from the provider that you created in authentik. Example: https://_authentik.company_/applications/saml/slack/sso/binding/redirect/
   • Identity Provider Issuer: set to https://slack.com
   • Public Certificate: add the certificate, which you can download from the authentik provider, under Download signing certificate.
4. Optionally, configure the other settings and customize the Sign in button label.
5. Click Save.

SCIM Integration (optional)

You can configure SCIM with Slack to automatically provision new Slack accounts whenever a new user is added to authentik.

Configure Slack

SCIM requires having a Slack account that is Business+ level or higher.

Create a Slack application on your workspace

1. Log in to the Slack Admin Dashboard.
2. Navigate to the Slack App creation page and create a new application.
3. After creating the application, click OAuth & Permissions in the sidebar.
4. Under User Token Scopes, add the admin scope.
5. Refresh the page.
6. Click Install to Workspace to add the application to your workspace.
7. Copy the generated User OAuth Token.

Configure authentik

Create a SCIM provider

1. Log in to authentik as an administrator and open the authentik Admin interface.
2. Navigate to Applications > Providers and click Create.
3. Select SCIM Provider as the provider type and click Next.
4. Enter the following values:
   • Name: Choose a descriptive name.
   • URL: https://api.slack.com/scim/v2/
   • Token: Paste the admin token you copied from Slack.
   • Compatibility Mode: Select Slack.
5. Click Finish to save the provider.

Add the SCIM provider to your application

1. Log in to authentik as an administrator and open the authentik Admin interface.
2. Navigate to Applications > Applications and select your Slack application.
3. Click Edit.
4. In the Backchannel Providers field, select the SCIM provider you created.
5. Click Update to save the application.