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If your preferred identity provider doesn't have a connector with Slack, you can use a custom SAML connection.
Note: We're happy to help troubleshoot your setup, but we can't always guarantee your connection will work with Slack. Send us a note and we'll do what we can!
Follow these parameters to configure your custom SAML connection.
Slack supports Identity Provider (IDP) Initiated Flow, Service Provider (SP) Initiated flow, Just In Time provisioning, and automatic provisioning through our SCIM API.
For SP-Initiated single sign-on, go to https://yourdomain.slack.com.
SSO post-back up URL
https://yourdomain.slack.com/sso/saml (Also known as the Assertion Consumer Service URL)
SAML Logout Endpoint
Slack supports HTTP POST binding, not HTTP REDIRECT. You must configure HTTP POST bindings in the IDP metadata.
Your IDP must ensure a user is both authenticated and authorized before sending an assertion. If a user isn't authorized, assertions should not be sent. We recommend your identity provider redirects people to an HTTP 403 page or something similar.
Slack requires that the SAML response is signed, and you will need to paste a valid X.509 .pem Certificate to verify your identity. This is different from your SSL certificate.
End-to-end encryption key
If you require an end-to-end encryption key for your IDP, you can find a certificate by clicking the Advanced Options button located in your workspace's SSO settings. You can then check the Sign AuthnRequest preference to reveal Slack's public encryption key.
Note: If you'd like to connect your Active Directory Federation Services (ADFS) instance, read ADFS single sign-on for details.
Who can use this feature?
Only Workspace Owners and Admins can access this feature.
Available to workspaces on the Plus plan and Slack Enterprise Grid.
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