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.



32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
 
# File 'lib/inspec/rule.rb', line 32

def initialize(id, profile_id, opts, &block)
  @impact = nil
  @title = nil
  @descriptions = {}
  @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 



184
185
186
 
# File 'lib/inspec/rule.rb', line 184

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

.merge(dst, src) ⇒ Object

rubocop:disable Metrics/AbcSize



221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
 
# File 'lib/inspec/rule.rb', line 221

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.descriptions(src.descriptions)     unless src.descriptions.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 



201
202
203
 
# File 'lib/inspec/rule.rb', line 201

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

.merge_count(rule) ⇒ Object 



197
198
199
 
# File 'lib/inspec/rule.rb', line 197

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

.prepare_checks(rule) ⇒ Object 



205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
 
# File 'lib/inspec/rule.rb', line 205

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 



180
181
182
 
# File 'lib/inspec/rule.rb', line 180

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

.resource_dsl ⇒ Object

rubocop:disable Style/TrivialAccessors



28
29
30
 
# File 'lib/inspec/rule.rb', line 28

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

.rule_id(rule) ⇒ Object 



172
173
174
 
# File 'lib/inspec/rule.rb', line 172

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

.set_rule_id(rule, value) ⇒ Object 



176
177
178
 
# File 'lib/inspec/rule.rb', line 176

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

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



192
193
194
195
 
# File 'lib/inspec/rule.rb', line 192

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

.skip_status(rule) ⇒ Object 



188
189
190
 
# File 'lib/inspec/rule.rb', line 188

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.



22
23
24
25
26
 
# 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, data = nil) ⇒ Object 



92
93
94
95
96
97
98
99
 
# File 'lib/inspec/rule.rb', line 92

def desc(v = nil, data = nil)
  return @descriptions[:default] if v.nil?
  if data.nil?
    @descriptions[:default] = unindent(v)
  else
    @descriptions[v.to_sym] = unindent(data)
  end
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



155
156
157
158
159
160
161
162
163
164
 
# File 'lib/inspec/rule.rb', line 155

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

#descriptions(description_hash = nil) ⇒ Object 



101
102
103
104
 
# File 'lib/inspec/rule.rb', line 101

def descriptions(description_hash = nil)
  return @descriptions if description_hash.nil?
  @descriptions.merge!(description_hash)
end

#expect(value, &block) ⇒ Object 



166
167
168
169
170
 
# File 'lib/inspec/rule.rb', line 166

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

#id(*_) ⇒ Object 



72
73
74
75
 
# File 'lib/inspec/rule.rb', line 72

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

#impact(v = nil) ⇒ Object 



77
78
79
80
81
82
83
84
85
 
# 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) 


135
136
137
138
139
140
141
 
# File 'lib/inspec/rule.rb', line 135

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 



106
107
108
109
110
111
112
113
114
 
# File 'lib/inspec/rule.rb', line 106

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 



127
128
129
 
# File 'lib/inspec/rule.rb', line 127

def source_file
  @__file
end

#tag(*args) ⇒ Object 



116
117
118
119
120
121
122
123
124
125
 
# File 'lib/inspec/rule.rb', line 116

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 



87
88
89
90
 
# File 'lib/inspec/rule.rb', line 87

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

#to_s ⇒ Object 



68
69
70
 
# File 'lib/inspec/rule.rb', line 68

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