Custom resource Security Descriptor should return SID of Windows services

[swapnil-patil96]

Describe the problem

Currently, Security Descriptor provides SID of built-in users and user groups, however, it could also return SID of Windows Services which are required for certain controls in the Stig Windows Server 2019 profile.

Possible Solution

Refactoring get_sid private method by adding the following LOCs to retrieve Service sid when it is unable to find user or user group SID

service_sids = inspec.command("sc.exe showSid \"#{entity_name}\" | Select-String -Pattern Service").stdout.strip.split("\r\n\r\n").map { |entry| entry.split(': ') }
return service_sids[0][1] unless service_sids.empty?