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#
# Author:: Seth Falcon (<seth@chef.io>)
# Copyright:: Copyright 2010-2016, 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.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require "chef/config"
require "chef/data_bag_item"
require "chef/encrypted_data_bag_item/decryptor"
require "chef/encrypted_data_bag_item/encryptor"
require "open-uri"
# An EncryptedDataBagItem represents a read-only data bag item where
# all values, except for the value associated with the id key, have
# been encrypted.
#
# EncryptedDataBagItem can be used in recipes to decrypt data bag item
# members.
#
# Data bag item values are assumed to have been encrypted using the
# default symmetric encryption provided by Encryptor.encrypt where
# values are converted to YAML prior to encryption.
#
# If the shared secret is not specified at initialization or load,
# then the contents of the file referred to in
# Chef::Config[:encrypted_data_bag_secret] will be used as the
# secret. The default path is /etc/chef/encrypted_data_bag_secret
#
# EncryptedDataBagItem is intended to provide a means to avoid storing
# data bag items in the clear on the Chef server. This provides some
# protection against a breach of the Chef server or of Chef server
# backup data. Because the secret must be stored in the clear on any
# node needing access to an EncryptedDataBagItem, this approach
# provides no protection of data bag items from actors with access to
# such nodes in the infrastructure.
#
class Chef::EncryptedDataBagItem
ALGORITHM = "aes-256-cbc"
AEAD_ALGORITHM = "aes-256-gcm"
#
# === Synopsis
#
# EncryptedDataBagItem.new(hash, secret)
#
# === Args
#
# +enc_hash+::
# The encrypted hash to be decrypted
# +secret+::
# The raw secret key
#
# === Description
#
# Create a new encrypted data bag item for reading (decryption)
#
def initialize(enc_hash, secret)
@enc_hash = enc_hash
@secret = secret
end
def [](key)
value = @enc_hash[key]
if key == "id" || value.nil?
value
else
Decryptor.for(value, @secret).for_decrypted_item
end
end
def []=(key, value)
raise ArgumentError, "assignment not supported for #{self.class}"
end
def to_hash
@enc_hash.keys.inject({}) { |hash, key| hash[key] = self[key]; hash }
end
def self.encrypt_data_bag_item(plain_hash, secret)
plain_hash.inject({}) do |h, (key, val)|
h[key] = if key != "id"
Encryptor.new(val, secret).for_encrypted_item
else
val
end
h
end
end
#
# === Synopsis
#
# EncryptedDataBagItem.load(data_bag, name, secret = nil)
#
# === Args
#
# +data_bag+::
# The name of the data bag to fetch
# +name+::
# The name of the data bag item to fetch
# +secret+::
# The raw secret key. If the +secret+ is nil, the value of the file at
# +Chef::Config[:encrypted_data_bag_secret]+ is loaded. See +load_secret+
# for more information.
#
# === Description
#
# Loads and decrypts the data bag item with the given name.
#
def self.load(data_bag, name, secret = nil)
raw_hash = Chef::DataBagItem.load(data_bag, name)
secret = secret || self.load_secret
self.new(raw_hash, secret)
end
def self.load_secret(path = nil)
path ||= Chef::Config[:encrypted_data_bag_secret]
if !path
raise ArgumentError, "No secret specified and no secret found at #{Chef::Config.platform_specific_path('/etc/chef/encrypted_data_bag_secret')}"
end
secret = case path
when /^\w+:\/\//
# We have a remote key
begin
Kernel.open(path).read.strip
rescue Errno::ECONNREFUSED
raise ArgumentError, "Remote key not available from '#{path}'"
rescue OpenURI::HTTPError
raise ArgumentError, "Remote key not found at '#{path}'"
end
else
if !File.exist?(path)
raise Errno::ENOENT, "file not found '#{path}'"
end
IO.read(path).strip
end
if secret.size < 1
raise ArgumentError, "invalid zero length secret in '#{path}'"
end
secret
end
end
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