Set up SpamAssassin

Scan incoming and outgoing email for spam. Use a local Unbound for DNS,
so we don't run into blocks for RBL queries.

cookbooks/unbound/resources/config_forward_zone.rb

@@ -0,0 +1,80 @@
+#
+# Cookbook:: unbound
+# Resource:: config_forward_zone
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+unified_mode true
+
+use 'partials/_config_file'
+
+property :config_file, String,
+          default: lazy { "#{config_dir}/forward-zone-#{name}.conf" },
+          desired_state: false,
+          description: 'Set to override unbound configuration file.'
+
+property :zone_name, String,
+          default: lazy { name }
+
+property :forward_host, [String, Array],
+          coerce: proc { |p| Array(p) }
+
+property :forward_addr, [String, Array],
+          coerce: proc { |p| Array(p) }
+
+property :forward_first, [String, true, false],
+          coerce: proc { |p| unbound_yes_no?(p) }
+
+property :forward_tls_upstream, [String, true, false],
+          coerce: proc { |p| unbound_yes_no?(p) }
+
+property :forward_ssl_upstream, [String, true, false],
+          coerce: proc { |p| unbound_yes_no?(p) }
+
+property :forward_tcp_upstream, [String, true, false],
+          coerce: proc { |p| unbound_yes_no?(p) }
+
+property :forward_no_cache, [String, true, false],
+          coerce: proc { |p| unbound_yes_no?(p) }
+
+load_current_value do |new_resource|
+  current_value_does_not_exist! unless ::File.exist?(new_resource.config_file)
+
+  if ::File.exist?(new_resource.config_file)
+    owner ::Etc.getpwuid(::File.stat(new_resource.config_file).uid).name
+    group ::Etc.getgrgid(::File.stat(new_resource.config_file).gid).name
+    mode ::File.stat(new_resource.config_file).mode.to_s(8)[-4..-1]
+  end
+end
+
+action_class do
+  def do_template_action
+    zone_config = {
+      'name' => new_resource.zone_name,
+      'forward-host' => new_resource.forward_host.dup,
+      'forward-addr' => new_resource.forward_addr.dup,
+      'forward-first' => new_resource.forward_first,
+      'forward-tls-upstream' => new_resource.forward_tls_upstream,
+      'forward-ssl-upstream' => new_resource.forward_ssl_upstream,
+      'forward-tcp-upstream' => new_resource.forward_tcp_upstream,
+      'forward-no-cache' => new_resource.forward_no_cache,
+    }.compact
+
+    config = {
+      'forward-zone' => zone_config,
+    }
+
+    perform_config_action(config)
+  end
+end