stig2nist.rb

require 'yaml'
require 'nokogiri'

# This is extracted from the DISA STIG content
input_doc = 'U_Red_Hat_Enterprise_Linux_7_STIG_V1R2_Manual-xccdf.xml'

# You have to pull this file out of the STIGViewer Java JAR file
cci_mapping = 'U_CCI_List.xml'

def cci2nist(cci, ccidoc)
  cci_item = ccidoc.at_css("[id=#{cci}]")
  return [] unless cci_item
  
  cci_item.css('reference').map do |reference|
    {   
      reference['title'] => reference['index']
    }   
  end.flatten
end
  
doc = Nokogiri::XML(File.read(input_doc))
ccidoc = Nokogiri::XML(File.read(cci_mapping))
  
group2cci = doc.css("Group").map do |groups|
  { groups['id'] => groups.css('ident').map do |cci|
    {cci.text => cci2nist(cci.text, ccidoc)}
    end 
  }
end
  
puts group2cci.to_yaml