Class: Inspec::Rule

Inherits:
Object
  • Object
show all
Includes:
RSpec::Matchers
Defined in:
lib/inspec/rule.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(id, profile_id, opts, &block) ⇒ Rule

Returns a new instance of Rule.



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# File 'lib/inspec/rule.rb', line 32

def initialize(id, profile_id, opts, &block)
  @impact = nil
  @title = nil
  @desc = nil
  @refs = []
  @tags = {}

  # not changeable by the user:
  @__block = block
  @__source_location = __get_block_source_location(&block)
  @__rule_id = id
  @__profile_id = profile_id
  @__checks = []
  @__skip_rule = {}
  @__merge_count = 0
  @__merge_changes = []
  @__skip_only_if_eval = opts[:skip_only_if_eval]

  # evaluate the given definition
  return unless block_given?
  begin
    instance_eval(&block)
  rescue StandardError => e
    # We've encountered an exception while trying to eval the code inside the
    # control block. We need to prevent the exception from bubbling up, and
    # fail the control. Controls are failed by having a failed resource within
    # them; but since our control block is unsafe (and opaque) to us, let's
    # make a dummy and fail that.
    location = block.source_location.compact.join(':')
    describe 'Control Source Code Error' do
      # Rubocop thinks we are raising an exception - we're actually calling RSpec's fail()
      its(location) { fail e.message } # rubocop: disable Style/SignalException
    end
  end
end

Class Method Details

.checks(rule) ⇒ Object 



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# File 'lib/inspec/rule.rb', line 175

def self.checks(rule)
  rule.instance_variable_get(:@__checks)
end

.merge(dst, src) ⇒ Object

rubocop:disable Metrics/AbcSize



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# File 'lib/inspec/rule.rb', line 212

def self.merge(dst, src) # rubocop:disable Metrics/AbcSize
  if src.id != dst.id
    # TODO: register an error, this case should not happen
    return
  end
  sp = rule_id(src)
  dp = rule_id(dst)
  if sp != dp
    # TODO: register an error, this case should not happen
    return
  end
  # merge all fields
  dst.impact(src.impact) unless src.impact.nil?
  dst.title(src.title)   unless src.title.nil?
  dst.desc(src.desc)     unless src.desc.nil?
  dst.tag(src.tag)       unless src.tag.nil?
  dst.ref(src.ref)       unless src.ref.nil?

  # merge indirect fields
  # checks defined in the source will completely eliminate
  # all checks that were defined in the destination
  sc = checks(src)
  dst.instance_variable_set(:@__checks, sc) unless sc.empty?
  skip_check = skip_status(src)
  sr = skip_check[:result]
  msg = skip_check[:message]
  set_skip_rule(dst, sr, msg) unless sr.nil?

  # Save merge history
  dst.instance_variable_set(:@__merge_count, merge_count(dst) + 1)
  dst.instance_variable_set(
    :@__merge_changes,
    merge_changes(dst) << src.instance_variable_get(:@__source_location),
  )
end

.merge_changes(rule) ⇒ Object 



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# File 'lib/inspec/rule.rb', line 192

def self.merge_changes(rule)
  rule.instance_variable_get(:@__merge_changes)
end

.merge_count(rule) ⇒ Object 



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# File 'lib/inspec/rule.rb', line 188

def self.merge_count(rule)
  rule.instance_variable_get(:@__merge_count)
end

.prepare_checks(rule) ⇒ Object 



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# File 'lib/inspec/rule.rb', line 196

def self.prepare_checks(rule)
  skip_check = skip_status(rule)
  return checks(rule) unless skip_check[:result].eql?(true)
  if skip_check[:message]
    msg = "Skipped control due to only_if condition: #{skip_check[:message]}"
  else
    msg = 'Skipped control due to only_if condition.'
  end

  # TODO: we use os as the carrier here, but should consider
  # a separate resource to do skipping
  resource = rule.os
  resource.skip_resource(msg)
  [['describe', [resource], nil]]
end

.profile_id(rule) ⇒ Object 



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# File 'lib/inspec/rule.rb', line 171

def self.profile_id(rule)
  rule.instance_variable_get(:@__profile_id)
end

.resource_dsl ⇒ Object

rubocop:disable Style/TrivialAccessors



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# File 'lib/inspec/rule.rb', line 28

def self.resource_dsl # rubocop:disable Style/TrivialAccessors
  @resource_dsl
end

.rule_id(rule) ⇒ Object 



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# File 'lib/inspec/rule.rb', line 163

def self.rule_id(rule)
  rule.instance_variable_get(:@__rule_id)
end

.set_rule_id(rule, value) ⇒ Object 



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# File 'lib/inspec/rule.rb', line 167

def self.set_rule_id(rule, value)
  rule.instance_variable_set(:@__rule_id, value)
end

.set_skip_rule(rule, value, message = nil) ⇒ Object 



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# File 'lib/inspec/rule.rb', line 183

def self.set_skip_rule(rule, value, message = nil)
  rule.instance_variable_set(:@__skip_rule,
                             { result: value, message: message })
end

.skip_status(rule) ⇒ Object 



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# File 'lib/inspec/rule.rb', line 179

def self.skip_status(rule)
  rule.instance_variable_get(:@__skip_rule)
end

.with_resource_dsl(resource_dsl) ⇒ Object

Include any resources from the given resource DSL. The passed resource_dsl will also be included in any Inspec::Expect objects we make.



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# File 'lib/inspec/rule.rb', line 22

def self.with_resource_dsl(resource_dsl)
  include resource_dsl
  @resource_dsl = resource_dsl
  true
end

Instance Method Details

#desc(v = nil) ⇒ Object 



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# File 'lib/inspec/rule.rb', line 92

def desc(v = nil)
  @desc = unindent(v) unless v.nil?
  @desc
end

#describe(*values, &block) ⇒ nil|DescribeBase

Describe will add one or more tests to this control. There is 2 ways of calling it:

describe resource do ... end

or

describe.one do ... end

Parameters:

  • Resource (any) —

    to be describe, string, or nil

  • An (Proc) —

    optional block containing tests for the described resource

Returns:

  • (nil|DescribeBase) —

    if called without arguments, returns DescribeBase



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# File 'lib/inspec/rule.rb', line 146

def describe(*values, &block)
  if values.empty? && !block_given?
    dsl = self.class.ancestors[1]
    Class.new(DescribeBase) do
      include dsl
    end.new(method(:__add_check))
  else
    __add_check('describe', values, with_dsl(block))
  end
end

#expect(value, &block) ⇒ Object 



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# File 'lib/inspec/rule.rb', line 157

def expect(value, &block)
  target = Inspec::Expect.new(value, &with_dsl(block))
  __add_check('expect', [value], target)
  target
end

#id(*_) ⇒ Object 



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# File 'lib/inspec/rule.rb', line 72

def id(*_)
  # never overwrite the ID
  @id
end

#impact(v = nil) ⇒ Object 



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# File 'lib/inspec/rule.rb', line 77

def impact(v = nil)
  if v.is_a?(String)
    @impact = Inspec::Impact.impact_from_string(v)
  elsif !v.nil?
    @impact = v
  end

  @impact
end

#only_if(message = nil) ⇒ nil

Skip all checks if only_if is false

Parameters:

  • &block (Type) —

    returns true if tests are added, false otherwise

Returns:

  • (nil) 


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# File 'lib/inspec/rule.rb', line 126

def only_if(message = nil)
  return unless block_given?
  return if @__skip_only_if_eval == true

  @__skip_rule[:result] ||= !yield
  @__skip_rule[:message] = message
end

#ref(ref = nil, opts = {}) ⇒ Object 



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# File 'lib/inspec/rule.rb', line 97

def ref(ref = nil, opts = {})
  return @refs if ref.nil? && opts.empty?
  if opts.empty? && ref.is_a?(Hash)
    opts = ref
  else
    opts[:ref] = ref
  end
  @refs.push(opts)
end

#source_file ⇒ Object 



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# File 'lib/inspec/rule.rb', line 118

def source_file
  @__file
end

#tag(*args) ⇒ Object 



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# File 'lib/inspec/rule.rb', line 107

def tag(*args)
  args.each do |arg|
    if arg.is_a?(Hash)
      @tags.merge!(arg)
    else
      @tags[arg] ||= nil
    end
  end
  @tags
end

#title(v = nil) ⇒ Object 



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# File 'lib/inspec/rule.rb', line 87

def title(v = nil)
  @title = v unless v.nil?
  @title
end

#to_s ⇒ Object 



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# File 'lib/inspec/rule.rb', line 68

def to_s
  Inspec::Rule.rule_id(self)
end