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Current competing solutions
The Windows POSIX subsystem has this exact problem.
- Currently it uses ranges above the 24 bit uid/gid space to map 'foreign' SIDs to POSIX principals.
Microsoft SAK appliances also have this problem to solve for their NFS services.
- Although not a good model to emulate, this will give an idea of a 'what the market will bear' solution.
NetApp store the full Windows ACL, but map the principals to POSIX principals on query.