ManifoldCF authority service doesn't handle multi-domain environments

The ManifoldCF authority service doesn't handle multi-domain environments.

The authority service returns a list of SIDs for the specified user, from all available ManifoldCF authorities, for example:

TOKEN:InternalAD:S-1-5-21-1234567890-1234567890-1234567890-1234

Note that the SID is prefixed with the name of the ManifoldCF authority.

Here is my setup:

Output connector: Solr
Authority connector1: Active Directory (internal.com domain), named InternalAD
Authority connector2: Active Directory (external.com domain), named ExternalAD
Repository connector: Sharepoint

If I set the Sharepoint repository connector to use the authority 'None (Global Authority)', then allow_token_document will contain SIDs that are not prefixed with any authority name, for example:

S-1-5-21-1234567890-1234567890-1234567890-1234

It is therefore not possible to get any search results, because the authority service tokens will not match the stored tokens (because they are prefixed with authority names).

If I set the Sharepoint repository connector to use one of the AD authorities 'InternalAD', then allow_token_document will contain SIDs that are prefixed with 'InternalAD', for example:

TOKEN:InternalAD:S-1-5-21-1234567890-1234567890-1234567890-1234

However, the prefix is always 'InternalAD', even if the user/group actually belongs to the external.com domain. Therefore it is not possible for users in the external.com domain to get any search results, because the authority service tokens will not match the stored tokens.

In essence, there seems to be a mismatch between the tokens that the authority service outputs, and those that repository connectors output.

Perhaps one solution would be to use the authority 'None (Global Authority)', and modify the authority service to take an extra query parameter that prevents it from prefixing SIDs with the authority name.