#
# Copyright:: Copyright 2009-2018, Chef Software Inc.
# License:: Apache License, Version 2.0
#
# 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.
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require "chef/resource"

class Chef
  class Resource
    class OpensslRsaPrivateKey < Chef::Resource
      require "chef/mixin/openssl_helper"
      include Chef::Mixin::OpenSSLHelper

      resource_name :openssl_rsa_private_key
      provides(:openssl_rsa_private_key) { true }
      provides(:openssl_rsa_key) { true } # legacy cookbook resource name

      description "Use the openssl_rsa_private_key resource to generate RSA private key files. If a valid RSA key file can be opened at the specified location, no new file will be created. If the RSA key file cannot be opened, either because it does not exist or because the password to the RSA key file does not match the password in the recipe, it will be overwritten."
      introduced "14.0"

      property :path, String,
               description: "The path to write the file to it's different than the resource name.",
               name_property: true

      property :key_length, Integer,
               equal_to: [1024, 2048, 4096, 8192],
               validation_message: "key_length (bits) must be 1024, 2048, 4096, or 8192.",
               description: "The desired bit length of the generated key.",
               default: 2048

      property :key_pass, String,
               description: "The desired passphrase for the key."

      property :key_cipher, String,
               equal_to: OpenSSL::Cipher.ciphers,
               validation_message: "key_cipher must be a cipher known to openssl. Run `openssl list-cipher-algorithms` to see available options.",
               description: "The designed cipher to use when generating your key. Run `openssl list-cipher-algorithms` to see available options.",
               default: "des3"

      property :owner, [String, nil],
               description: "The owner of all files created by the resource."

      property :group, [String, nil],
               description: "The group of all files created by the resource."

      property :mode, [Integer, String],
               description: "The permission mode of all files created by the resource.",
               default: "0600"

      property :force, [TrueClass, FalseClass],
               description: "Force creating the key even if the existing key exists.",
               default: false, desired_state: false

      action :create do
        description "Create the RSA private key."

        return if new_resource.force || priv_key_file_valid?(new_resource.path, new_resource.key_pass)

        converge_by("create #{new_resource.key_length} bit RSA key #{new_resource.path}") do
          if new_resource.key_pass
            unencrypted_rsa_key = gen_rsa_priv_key(new_resource.key_length)
            rsa_key_content = encrypt_rsa_key(unencrypted_rsa_key, new_resource.key_pass, new_resource.key_cipher)
          else
            rsa_key_content = gen_rsa_priv_key(new_resource.key_length).to_pem
          end

          file new_resource.path do
            action :create
            owner new_resource.owner unless new_resource.owner.nil?
            group new_resource.group unless new_resource.group.nil?
            mode new_resource.mode
            sensitive true
            content rsa_key_content
          end
        end
      end
    end
  end
end