Single sign-on (SSO) with ELLO

Modified on Tue, 19 Nov 2019 at 03:29 PM

Overview

ELLO implements single sign-on (SSO) using the SAML 2.0 protocol. ELLO can be configured to work with two kinds of Identity Providers (IDPs).

internal IDP: the one you see when log in to https://ello.complianceonline.co.za
external IDP: Companies provide an own IDP

Basic Authentication Flow

When the user tries to access the ELLOapplication in the browser, the Service Provider (SP) checks if the user is already authenticated. If not, then the user is redirected to the Identify Provider (IDP), which initiates the authentication (e.g. via username and password). After successful authentication, the user is redirected back to the Service Provider which grants access to the ELLO application. The IDP provides attributes, e.g. email address, to the Service Provider (SP) which are used to properly identify the user within ELLO.

SSO Authentication Flow

Supported IDPs

ELLO is tested and works with IDPs which support the SAML 2.0 protocol, e.g.

IDP Name	IDP Documentation
Microsoft Active Directory Federation Services (AD FS)	https://msdn.microsoft.com/en-us/library/bb897402.aspx
Microsoft Azure AD	https://docs.microsoft.com/en-us/azure/active-directory/connect/active-directory-aadconnect-federation-saml-idp
Google IDP	https://support.google.com/a/answer/6087519?hl=en
Okta	https://www.okta.com/topic/saml/

Checklist external IDP

Prerequisites:

IDP must support SAML 2.0
client browser needs network access to IDP

Setup steps

Customer provides Start URL e.g https://<IDP-URL>/adfs/ls
Customer provides Public X.509 certificate file
ELLO sets up a client account and configures to use the customer's IDP. Once setup the metadata of ELLO will be sent to the customer
Customer imports the ELLO metadata and configures SAML attributes that ELLO requires.
Customer tests the access to ELLO
If successful, ELLO deactivates the access via username / password.

Attribute Mapping

Please ensure that the name of every SAML 2.0 attribute exactly matches the name ELLO SP expects.

Name	Format	Example	Comment
emailAddress	urn:oasis:names:tc:SAML:2.0:attrname-format:uri	john.doe@customer.com

For Microsoft ADFS we provide custom rule mappings, see https://compliance.freshdesk.com/support/solutions/articles/12000059870-sso-with-adfs

Example SAML message

<saml2:AttributeStatement>
    <saml2:Attribute FriendlyName="emailAddress" Name="emailAddress" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri">
          <saml2:AttributeValue xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string">
          john.doe@customer.com
          </saml2:AttributeValue>
   </saml2:Attribute>
</saml2:AttributeStatement>