Security Identifier (SID) to User Identifier (uid) ResolutionSystem

Luke Kenneth Casson Leighton lkcl at
Sun Jan 2 15:03:02 GMT 2000

On 2 Jan 2000, Todd Sabin wrote:

> Luke Kenneth Casson Leighton <lkcl at> writes:
> > 
> > also, does anyone know any really good nt kernel gurus/hackers to ask the
> > following question: does NT has some sort of internal virtual
> > representation for users in order to avoid having to compare SIDSs?  i
> > _do_ know that  they use a LUID (local uid) in the LSA (local security
> > authority), but i think tis only has significance to each LSA instance,
> > not to the kernel.
> No, the kernel uses SIDs internally.  I've traced into the AccessCheck
> code with Soft-ICE and the kernel does compare SIDs with each other.

most excellent.  that's exactly what i needed to know.

> The LUIDs are associated with a logon session.  One of the things in

yep.  i wondered if anything else was done with them.

thx todd!

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