add wmi resource

lib/inspec/resource.rb

@@ -99,6 +99,7 @@ require 'resources/user'
 require 'resources/vbscript'
 require 'resources/windows_feature'
 require 'resources/xinetd'
+require 'resources/wmi'
 require 'resources/yum'
 
 # file formats, depend on json implementation

lib/resources/wmi.rb

@@ -0,0 +1,51 @@
+# encoding: utf-8
+# author: Christoph Hartmann
+# author: Dominik Richter
+
+class WMI < Inspec.resource(1)
+  name 'wmi'
+  desc 'request wmi information'
+  example "
+    describe wmi('RSOP_SecuritySettingNumeric', {
+      namespace: 'root\\rsop\\computer',
+      filter: 'KeyName = 'MinimumPasswordAge' And precedence=1'
+    }) do
+       its('Setting') { should eq true }
+    end
+  "
+
+  # This would be the same as:
+  # WMIC /NAMESPACE:\\root\rsop\computer PATH RSOP_SecuritySettingNumeric WHERE "KeyName = 'MinimumPasswordAge' And precedence=1" GET Setting
+  attr_accessor :content
+  def initialize(wmiclass, opts)
+    @wmiclass = wmiclass
+    @wminamespace = opts[:namespace]
+    @wmifilter = opts[:filter]
+
+    # verify that this resource is only supported on Windows
+    return skip_resource 'The `windows_feature` resource is not supported on your OS.' unless inspec.os.windows?
+  end
+
+  # returns nil, if not existant or value
+  def method_missing(property)
+    info[property.to_s]
+  end
+
+  def to_s
+    "WMI #{@wmiclass} where #{@wmifilter}"
+  end
+
+  def info
+    return @content if defined?(@content)
+    @content = {}
+    cmd = inspec.command("Get-WmiObject -namespace #{@wminamespace} -class #{@wmiclass} -filter \"#{@wmifilter}\" | ConvertTo-Json")
+    @content = JSON.parse(cmd.stdout)
+    # sometimes we get multiple values
+    if @content.is_a?(Array)
+      # select the first entry
+      @content = @content.first
+    end
+  rescue JSON::ParserError => e
+    @content
+  end
+end