A method, apparatus, and computer-readable media for authorizing users of network portals to access a secure resource hosted by a secure server comprises storing a plurality of user identifiers, each representing a user of an owning portal; storing for each of the user identifiers an access privilege to the secure resource; storing a proxy user identifier representing a guest portal and a guest access privilege to the secure resource for all of the users of the guest portal; receiving from the owning portal a first request for access to the secure resource, the first request comprising a first user identifier representing a user of the owning portal; granting to the user of the owning portal access to the secure resource according to the access privilege stored for the first user identifier; receiving from the guest portal a second request for access to the secure resource, the second request comprising a second user identifier representing a user of the guest portal and a portal identifier representing the guest portal; and granting to the user of the guest portal access to the secure resource according to the guest access privilege stored in the authorization table for the proxy user identifier.