Add new windows_firewall and windows_firewall_rule resources

Signed-off-by: Thomas Heinen <theinen@tecracer.de>

docs/resources/windows_firewall.md.erb

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+---
+title: About the windows_firewall Resource
+platform: windows
+---
+
+# windows_firewall
+
+Use the `windows_firewall` Chef InSpec audit resource to test if a firewall profile is correctly configured on a Windows system.
+
+<br>
+
+## Availability
+
+### Installation
+
+This resource is distributed along with Chef InSpec itself. You can use it automatically.
+
+## Syntax
+
+A `windows_firewall` resource block specifies which profile to validate:
+
+    describe windows_firewall('name') do
+      it { should be_enabled }
+    end
+
+where
+
+* `('name')` must specify the name of a firewall profile, such as `'Public'`, `'Private'` or `'Domain'`
+* `be_enabled` is a valid matcher for this resource
+
+<br>
+
+## Examples
+
+The following example shows how to use this Chef InSpec audit resource.
+
+### Test if the firewall has the appropriate amount of rules and default Accept
+
+    describe windows_firewall('Public') do
+      it { should be_enabled }
+      it { should have_default_inbound_allowed }
+      its('num_rules') { should eq 219 }
+    end
+
+<br>
+
+## Properties
+
+The resource compiles the following list of firewall profile properties:
+
+* `description`
+* `default_inbound_action`
+* `default_outbound_action`
+* `allow_inbound_rules`
+* `allow_local_firewall_rules`
+* `allow_local_ipsec_rules`
+* `allow_user_apps`
+* `allow_user_ports`
+* `allow_unicast_response_to_multicast`
+* `notify_on_listen`
+* `enable_stealth_mode_for_ipsec`
+* `log_max_size_kilobytes`
+* `log_allowed`
+* `log_blocked`
+* `log_ignored`
+* `num_rules`
+
+Each of these properties can be used in two distinct ways:
+
+    its('default_inbound_action') { should cmp 'Allow' }
+
+or via matcher:
+
+    it { should have_default_inbound_action 'Allow' }
+
+Shortcuts are defined for:
+
+* `have_default_inbound_allow?`
+* `have_default_outbound_allow?`
+
+## Matchers
+
+For a full list of available matchers, please visit our [matchers page](https://www.inspec.io/docs/reference/matchers/).
+
+### be_enabled
+
+The `be_enabled` matcher tests if the Profile is enabled:
+
+    it { should be_enabled }
+

docs/resources/windows_firewall_rule.md.erb

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+---
+title: About the windows_firewall_rule Resource
+platform: windows
+---
+
+# windows_firewall_rule
+
+Use the `windows_firewall_rule` Chef InSpec audit resource to test if a firewall rule is correctly configured on a Windows system.
+
+<br>
+
+## Availability
+
+### Installation
+
+This resource is distributed along with Chef InSpec itself. You can use it automatically.
+
+## Syntax
+
+A `windows_firewall_rule` resource block specifies which rule to validate:
+
+    describe windows_firewall_rule('name') do
+      it { should be_enabled }
+    end
+
+where
+
+* `('name')` must specify the name of a firewall rule, which is not the firewall rule's display name
+* `be_enabled` is a valid matcher for this resource
+
+<br>
+
+## Examples
+
+The following example shows how to use this Chef InSpec audit resource.
+
+### Test if the firewall contains a rule for outbound HTTPS
+
+    describe windows_firewall_rule('HTTPS Out') do
+      it { should be_enabled }
+      it { should be_allowed }
+      it { should be_outbound }
+      it { should be_tcp }
+
+      its('remote_port') { should eq 443 }
+    end
+
+<br>
+
+## Properties
+
+The resource compiles the following list of firewall rule properties:
+
+* `description`
+* `displayname`
+* `group`
+* `local_address`
+* `local_port`
+* `remote_address`
+* `remote_port`
+* `direction`
+* `protocol`
+* `icmp_type`
+* `action`
+* `profile`
+* `program`
+* `service`
+* `interface_type`
+
+Each of these properties can be used in two distinct ways:
+
+    its('remote_address') { should cmp '192.0.2.42' }
+
+or via matcher:
+
+    it { should have_remote_address '192.0.2.42' }
+
+## Matchers
+
+For a full list of available matchers, please visit our [matchers page](https://www.inspec.io/docs/reference/matchers/).
+
+### exist
+
+The `be_enabled` matcher tests if the rule does exist:
+
+    it { should exist }
+
+### be_enabled
+
+The `be_enabled` matcher tests if the rule is enabled:
+
+    it { should be_enabled }
+
+### be_allowed
+
+The `be_allowed` matcher tests if the rule is allowing traffic:
+
+    it { should be_allowed }
+
+### be_inbound
+
+The `be_inbound` matcher tests if the rule is an inbound rule:
+
+    it { should be_inbound }
+
+### be_outbound
+
+The `be_outbound` matcher tests if the rule is an outbound rule:
+
+    it { should be_outbound }
+
+### be_tcp
+
+The `be_tcp` matcher tests if the rule is for the TCP protocol:
+
+    it { should be_tcp }
+
+### be_ucp
+
+The `be_ucp` matcher tests if the rule is for the DCP protocol:
+
+    it { should be_dcp }
+
+### be_icmp
+
+The `be_icmp` matcher tests if the rule is for any ICMP protocol:
+
+    it { should be_icmp }
+
+### be_icmpv4
+
+The `be_icmpv4` matcher tests if the rule is for the ICMPv4 protocol:
+
+    it { should be_icmpv4 }
+
+### be_icmpv6
+
+The `be_icmpv6` matcher tests if the rule is for any ICMPv6 protocol:
+
+    it { should be_icmpv6 }
+

lib/inspec/resources/windows_firewall.rb

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+module Inspec::Resources
+  class WindowsFirewall < Inspec.resource(1)
+    name "windows_firewall"
+    supports platform: "windows"
+    desc "Check properties of the Windows Firewall for a specific profile."
+    example <<~EXAMPLE
+      describe windows_firewall("Public") do
+        it { should be_enabled }
+        its("default_inbound_action") { should_not cmp "NotConfigured" }
+        its("num_rules") { should be 19 }
+      end
+    EXAMPLE
+
+    def initialize(profile = "Public")
+      @profile = profile
+      @state = {}
+
+      load_profile_cmd = load_firewall_profile(profile)
+      cmd = inspec.powershell(load_profile_cmd)
+
+      @state = JSON.load(cmd.stdout) unless cmd.stdout.empty?
+    end
+
+    def to_s
+      "Windows Firewall (Profile #{@profile})"
+    end
+
+    def exist?
+      !@state.empty?
+    end
+
+    def enabled?
+      @state["enabled"]
+    end
+
+    def default_inbound_allowed?
+      @state["default_inbound_action"] == "Allow"
+    end
+
+    def default_outbound_allowed?
+      @state["default_outbound_action"] == "Allow"
+    end
+
+    # Access to return values from Powershell via `its("PROPERTY")` and `have_PROPERTY "VALUE"`
+    def method_missing(method_name, *arguments, &_block)
+      property = normalize_for_have_access(method_name)
+
+      if method_name.to_s.start_with? "has_"
+        expected_value = arguments.first
+        respond_to_have(property, expected_value)
+      else
+        access_property(property)
+      end
+    end
+
+    def respond_to_missing?(method_name, _include_private = false)
+      property = normalize_for_have_access(method_name)
+
+      @state.key? property
+    end
+
+    private
+
+    def normalize_for_have_access(property)
+      property.to_s
+        .delete_prefix("has_")
+        .delete_suffix("?")
+    end
+
+    def access_property(property)
+      @state[property]
+    end
+
+    def respond_to_have(property, value)
+      @state[property] == value
+    end
+
+    def load_firewall_profile(profile_name)
+      <<-EOH
+        Remove-TypeData System.Array # workaround for PS bug here: https://bit.ly/2SRMQ8M
+        $profile = Get-NetFirewallProfile -Name "#{profile_name}"
+        $count = @($profile | Get-NetFirewallRule).Count
+        ([PSCustomObject]@{
+          profile_name = $profile.Name
+          profile = $profile.Profile.ToString()
+          description = $profile.Description
+          enabled = [bool]::Parse($profile.Enabled.ToString())
+          default_inbound_action = $profile.DefaultInboundAction.ToString()
+          default_outbound_action = $profile.DefaultOutboundAction.ToString()
+
+          allow_inbound_rules = $profile.AllowInboundRules.ToString()
+          allow_local_firewall_rules = $profile.AllowLocalFirewallRules.ToString()
+          allow_local_ipsec_rules = $profile.AllowLocalIPsecRules.ToString()
+          allow_user_apps = $profile.AllowUserApps.ToString()
+          allow_user_ports = $profile.AllowUserPorts.ToString()
+          allow_unicast_response_to_multicast = $profile.AllowUnicastResponseToMulticast.ToString()
+
+          notify_on_listen = $profile.NotifyOnListen.ToString()
+          enable_stealth_mode_for_ipsec = $profile.EnableStealthModeForIPsec.ToString()
+          log_max_size_kilobytes = $profile.LogMaxSizeKilobytes
+          log_allowed = $profile.LogAllowed.ToString()
+          log_blocked = $profile.LogBlocked.ToString()
+          log_ignored = $profile.LogIgnored.ToString()
+
+          num_rules = $count
+        }) | ConvertTo-Json
+      EOH
+    end
+  end
+end

lib/inspec/resources/windows_firewall_rule.rb

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+module Inspec::Resources
+  class WindowsFirewallRule < Inspec.resource(1)
+    name "windows_firewall_rule"
+    supports platform: "windows"
+    desc "Check properties of a Windows Firewall rule."
+    example <<~EXAMPLE
+      describe windows_firewall_rule("Name") do
+        it { should exist }
+        it { should be_enabled }
+
+        it { should be_outbound}
+        it { should be_tcp }
+        it { should have_remote_port 80 }
+      end
+    EXAMPLE
+
+    def initialize(name)
+      @name = name
+      @state = {}
+
+      query = load_firewall_state(name)
+      cmd = inspec.powershell(query)
+      @state = JSON.load(cmd.stdout) unless cmd.stdout.empty?
+    end
+
+    def to_s
+      "Windows Firewall Rule #{@name}"
+    end
+
+    def exist?
+      !@state.empty?
+    end
+
+    def enabled?
+      @state["enabled"]
+    end
+
+    def allowed?
+      @state["action"] == "Allow"
+    end
+
+    def inbound?
+      @state["direction"] == "Inbound"
+    end
+
+    def outbound?
+      ! inbound?
+    end
+
+    def tcp?
+      @state["protocol"] == "TCP"
+    end
+
+    def udp?
+      @state["protocol"] == "UDP"
+    end
+
+    def icmp?
+      @state["protocol"].start_with? "ICMP"
+    end
+
+    def icmpv4?
+      @state["protocol"] == "ICMPv4"
+    end
+
+    def icmpv6?
+      @state["protocol"] == "ICMPv6"
+    end
+
+    # Access to return values from Powershell via `its("PROPERTY")` and `have_PROPERTY? "VALUE"`
+    def method_missing(method_name, *arguments, &_block)
+      property = normalize_for_have_access(method_name)
+
+      if method_name.to_s.start_with? "has_"
+        expected_value = arguments.first
+        respond_to_have(property, expected_value)
+      else
+        access_property(property)
+      end
+    end
+
+    def respond_to_missing?(method_name, _include_private = false)
+      property = normalize_for_have_access(method_name)
+
+      @state.key? property
+    end
+
+    private
+
+    def normalize_for_have_access(property)
+      property.to_s
+        .delete_prefix("has_")
+        .delete_suffix("?")
+    end
+
+    def access_property(property)
+      @state[property]
+    end
+
+    def respond_to_have(property, value)
+      @state[property] == value
+    end
+
+    # Taken from Chef, but changed `firewall_action` to `action` for consistency
+    # @see https://github.com/chef/chef/blob/master/lib/chef/resource/windows_firewall_rule.rb
+    def load_firewall_state(rule_name)
+      <<-EOH
+        Remove-TypeData System.Array # workaround for PS bug here: https://bit.ly/2SRMQ8M
+        $rule = Get-NetFirewallRule -Name "#{rule_name}"
+        $addressFilter = $rule | Get-NetFirewallAddressFilter
+        $portFilter = $rule | Get-NetFirewallPortFilter
+        $applicationFilter = $rule | Get-NetFirewallApplicationFilter
+        $serviceFilter = $rule | Get-NetFirewallServiceFilter
+        $interfaceTypeFilter = $rule | Get-NetFirewallInterfaceTypeFilter
+        ([PSCustomObject]@{
+          rule_name = $rule.Name
+          description = $rule.Description
+          displayname = $rule.DisplayName
+          group = $rule.Group
+          local_address = $addressFilter.LocalAddress
+          local_port = $portFilter.LocalPort
+          remote_address = $addressFilter.RemoteAddress
+          remote_port = $portFilter.RemotePort
+          direction = $rule.Direction.ToString()
+          protocol = $portFilter.Protocol
+          icmp_type = $portFilter.IcmpType
+          action = $rule.Action.ToString()
+          profile = $rule.Profile.ToString()
+          program = $applicationFilter.Program
+          service = $serviceFilter.Service
+          interface_type = $interfaceTypeFilter.InterfaceType.ToString()
+          enabled = [bool]::Parse($rule.Enabled.ToString())
+        }) | ConvertTo-Json
+      EOH
+    end
+  end
+end