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

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

Overview

TODO:

should this be separated into different files?

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.

Instance Method Summary collapse

Instance Method Details

#rights_attribute(name) ⇒ Object

“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 representing 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 106

def rights_attribute(name)
  # equivalent to something like:
  # def rights(permissions=nil, principals=nil, args_hash=nil)
  define_method(name) do |permissions = nil, principals = nil, args_hash = nil|
    rights = instance_variable_get("@#{name}".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 !(%i{full_control modify read_execute read write}.include?(permission.to_sym))
          raise ArgumentError, "permissions property must be :full_control, :modify, :read_execute, :read, :write or an integer representing Windows permission flags"
        end
      end

      [ principals ].flatten.each do |principal|
        unless principal.is_a?(String)
          raise ArgumentError, "principals property 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' property must specify either :applies_to_children or :applies_to_self."
        end
        if input[:one_level_deep] == true
          raise ArgumentError, "'rights' property specified :one_level_deep without specifying :applies_to_children."
        end
      end
      rights ||= []
      rights << input
    end
    set_or_return(
      name,
      rights,
      {}
    )
  end
end