Configuring Proxy with Apache Knox
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Mapping Authenticated Users to Groups

The Knox Gateway uses group membership for Service Level Authorization only. The gateway does not propagate the user's group when communicating with the cluster.

The group.principal.mapping parameter of the identity-assertion provider determines the user's group membership. The gateway evaluates this parameter after the principal.mapping parameter using the authenticated user. Unlike principal.mapping, the group mapping applies all the matching values. A user is a member of all matching groups.