Module: Chef::Mixin::Securable::WindowsMacros

Defined in:
lib/chef/mixin/securable.rb

Overview

WindowsMacros

Defines methods for adding attributes to a chef resource to describe Windows file security metadata.

This module is meant to be used to extend a class (instead of ‘include`-ing). A class is automatically extended with this module when it includes WindowsSecurableAttributes. – TODO should this be separated into different files?

Instance Method Summary collapse

Instance Method Details

#rights_attribute(name) ⇒ Object

rights_attribute

“meta-method” for dynamically creating rights attributes on resources.

Multiple rights attributes can be declared. This enables resources to have multiple rights attributes with separate runtime states.

For example, Chef::Resource::RemoteDirectory supports different rights on the directories and files by declaring separate rights attributes for each (rights and files_rights).

User Level API

Given a resource that calls

rights_attribute(:rights)

Then the resource DSL could be used like this:

rights :read, ["Administrators","Everyone"]
rights :deny, "Pinky"
rights :full_control, "Users", :applies_to_children => true
rights :write, "John Keiser", :applies_to_children => :containers_only, :applies_to_self => false, :one_level_deep => true

Internal Data Structure

rights attributes support multiple right declarations in a single resource block–the data will be merged into a single internal hash.

The internal representation is a hash with the following keys:

  • ‘:permissions`: Integer of Windows permissions flags, 1..2^32

or one of ‘[:full_control, :modify, :read_execute, :read, :write]`

  • ‘:principals`: String or Array of Strings represnting usernames on

the system.

  • ‘:applies_to_children` (optional): Boolean

  • ‘:applies_to_self` (optional): Boolean

  • ‘:one_level_deep` (optional): Boolean



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# File 'lib/chef/mixin/securable.rb', line 110

def rights_attribute(name)

  # equivalent to something like:
  # def rights(permissions=nil, principals=nil, args_hash=nil)
  define_method(name) do |*args|
    # Ruby 1.8 compat: default the arguments
    permissions = args.length >= 1 ? args[0] : nil
    principals = args.length >= 2 ? args[1] : nil
    args_hash = args.length >= 3 ? args[2] : nil
    raise ArgumentError.new("wrong number of arguments (#{args.length} for 3)") if args.length >= 4

    rights = self.instance_variable_get("@#{name.to_s}".to_sym)
    unless permissions.nil?
      input = {
        :permissions => permissions,
        :principals => principals
      }
      input.merge!(args_hash) unless args_hash.nil?

      validations = {:permissions => { :required => true },
                     :principals => { :required => true, :kind_of => [String, Array] },
                     :applies_to_children => { :equal_to => [ true, false, :containers_only, :objects_only ]},
                     :applies_to_self => { :kind_of => [ TrueClass, FalseClass ] },
                     :one_level_deep => { :kind_of => [ TrueClass, FalseClass ] }
                    }
      validate(input, validations)

      [ permissions ].flatten.each do |permission|
        if permission.is_a?(Integer)
          if permission < 0 || permission > 1<<32
            raise ArgumentError, "permissions flags must be positive and <= 32 bits (#{permission})"
          end
        elsif !([:full_control, :modify, :read_execute, :read, :write].include?(permission.to_sym))
          raise ArgumentError, "permissions parameter must be :full_control, :modify, :read_execute, :read, :write or an integer representing Windows permission flags"
        end
      end

      [ principals ].flatten.each do |principal|
        if !principal.is_a?(String)
          raise ArgumentError, "principals parameter must be a string or array of strings representing usernames"
        end
      end

      if input[:applies_to_children] == false
        if input[:applies_to_self] == false
          raise ArgumentError, "'rights' attribute must specify either :applies_to_children or :applies_to_self."
        end
        if input[:one_level_deep] == true
          raise ArgumentError, "'rights' attribute specified :one_level_deep without specifying :applies_to_children."
        end
      end
      rights ||= []
      rights << input
    end
    set_or_return(
      name,
      rights,
      {}
    )
  end
end