mattermost

• Category: Apps
• Status: 3
• Image: mattermost/mattermost-team-edition, 4, upstream
• Healthcheck: No
• Backups: Yes
• Email: 1
• Tests: 2
• SSO: No

Basic usage

1. Set up Docker Swarm and abra
2. Deploy coop-cloud/traefik
3. abra app new --secrets --app-name YOURAPPNAME mattermost (optionally with --pass if you'd like to save secrets in pass)
4. abra app config YOURAPPNAME - be sure to change $DOMAIN to something that resolves to your Docker swarm box
5. abra app deploy YOURAPPNAME
6. Open the configured domain in your browser to finish set-up

Enable Email

• abra app config YOURAPPNAME
• Uncomment the section starting with Email Support
• abra app secret i chat.justiceexchange.org smtp_pass v1 'yourSMTPpassword'
• abra app undeploy YOURAPPNAME
• abra app deploy YOURAPPNAME

Enable SSO with Authentik

This is how to configure your Mattermost server to accept logins from your Authentik SSO provider.

Configure Authentik

Create a property mapping

• Log in as administrator of your Authentik instance
• Go to https://authentik.yourserver.org/if/admin/#/core/property-mappings and choose Create
• Choose Scope Mapping
  • Name: Mattermost ID
  • Scope Name: id
  • Description: optional own description
  • Expression: return { "id": request.user.id }
• Create another Scope Mapping
  • Name: Mattermost Username
  • Scope Name: username
  • Description: optional own description
  • Expression: return { "username": request.user.username }

Create Application and Provider

• Go to https://authentik.yourserver.org/if/admin/#/core/applications and choose Create With Wizard
  • Application Name: mattermost
  • Next
  • Choose OAuth2/OIDC
  • Set Authorization flow: default-provider-authorization-implicit-consent (Authorize Application)
  • Copy the Client ID and Client Secret, you'll need them later
  • Add Redirect URIs:
    • https://mattermost.yourserver.org/login/gitlab/complete
    • https://mattermost.yourserver.org/signup/gitlab/complete
  • Expand Advanced Protocol Settings
  • Under Scopes, select Mattermost ID and Mattermost Username, and click the > to add them to Selected Scopes
  • Submit

Configure Mattermost

WARNING: Following these steps will overwrite the configuration of your Mattermost instance

• abra app configure YOURAPPNAME
  • Uncomment the section starting with ## SSO config
  • Set SSO_ID to the value you saved when configuring Authentik
• abra app secret insert YOURAPPNAME mattermost_sso_secret v1 <the authentik provider secret you saved>
• abra app undeploy YOURAPPNAME
• abra app deploy YOURAPPNAME

Disable non-SSO login (Optional)

• Ensure that your SSO user has the System Admin role: https://YOURAPPNAME/admin_console/user_management/users
• Go to https://YOURAPPNAME/admin_console/authentication/email
• Set Enable sign-in with email and Enable sign-in with username to false