Allow administrator to impersonate another user.
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Zope (and Plone) PAS Plugin providing users and groups from LDAP directory
Authomatic OAuth1/OAuth2/OpenID Login Integration with Plone
PAS plugin for OpenID Connect authentication
Reject unconditionnally anonymous users from a Plone site, without any change in your security policy matrix or workflows. The basic use case is an extranet, where all visitors must be authenticated