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#
# Author:: Daniel DeLeo (<dan@opscode.com>)
# Copyright:: Copyright (c) 2012 Opscode, 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/rest'
require 'chef/exceptions'
class Chef
class ApiClient
# ==Chef::ApiClient::Registration
# Manages the process of creating or updating a Chef::ApiClient on the
# server and writing the resulting private key to disk. Registration uses
# the validator credentials for its API calls. This allows it to bootstrap
# a new client/node identity by borrowing the validator client identity
# when creating a new client.
class Registration
attr_reader :destination
attr_reader :name
def initialize(name, destination, opts = {})
opts ||= {}
@name = name
@destination = destination
@http_api_as_validator = opts[:http_api]
@update = opts[:update].nil? ? true : opts[:update]
@server_generated_private_key = nil
end
# Runs the client registration process, including creating the client on
# the chef-server and writing its private key to disk.
#--
# If client creation fails with a 5xx, it is retried up to 5 times. These
# retries are on top of the retries with randomized exponential backoff
# built in to Chef::REST. The retries here are a workaround for failures
# caused by resource contention in Hosted Chef when creating a very large
# number of clients simultaneously, (e.g., spinning up 100s of ec2 nodes
# at once). Future improvements to the affected component should make
# these retries unnecessary.
def run
assert_destination_writable!
retries = Config[:client_registration_retries] || 5
begin
@update ? create_or_update : create
rescue Net::HTTPFatalError => e
# HTTPFatalError implies 5xx.
raise if retries <= 0
retries -= 1
Chef::Log.warn("Failed to register new client, #{retries} tries remaining")
Chef::Log.warn("Response: HTTP #{e.response.code} - #{e}")
retry
end
write_key
end
def assert_destination_writable!
if (File.exists?(destination) && !File.writable?(destination)) or !File.writable?(File.dirname(destination))
raise Chef::Exceptions::CannotWritePrivateKey, "I cannot write your private key to #{destination} - check permissions?"
end
end
def write_key
::File.open(destination, file_flags, 0600) do |f|
f.print(private_key)
end
rescue IOError => e
raise Chef::Exceptions::CannotWritePrivateKey, "Error writing private key to #{destination}: #{e}"
end
def create_or_update
create
rescue Net::HTTPServerException => e
# If create fails because the client exists, attempt to update. This
# requires admin privileges.
raise unless e.response.code == "409"
update
end
def create
response = http_api.post("clients", post_data)
@server_generated_private_key = response["private_key"]
response
end
def update
response = http_api.put("clients/#{name}", put_data)
if response.respond_to?(:private_key) # Chef 11
@server_generated_private_key = response.private_key
else # Chef 10
@server_generated_private_key = response["private_key"]
end
response
end
def put_data
base_put_data = { :name => name, :admin => false }
if self_generate_keys?
base_put_data[:public_key] = generated_public_key
else
base_put_data[:private_key] = true
end
base_put_data
end
def post_data
post_data = { :name => name, :admin => false }
post_data[:public_key] = generated_public_key if self_generate_keys?
post_data
end
def http_api
@http_api_as_validator ||= Chef::REST.new(Chef::Config[:chef_server_url],
Chef::Config[:validation_client_name],
Chef::Config[:validation_key])
end
# Whether or not to generate keys locally and post the public key to the
# server. Delegates to `Chef::Config.local_key_generation`. Servers
# before 11.0 do not support this feature.
def self_generate_keys?
Chef::Config.local_key_generation
end
def private_key
if self_generate_keys?
generated_private_key.to_pem
else
@server_generated_private_key
end
end
def generated_private_key
@generated_key ||= OpenSSL::PKey::RSA.generate(2048)
end
def generated_public_key
generated_private_key.public_key.to_pem
end
def file_flags
base_flags = File::CREAT|File::TRUNC|File::RDWR
# Windows doesn't have symlinks, so it doesn't have NOFOLLOW
base_flags |= File::NOFOLLOW if defined?(File::NOFOLLOW)
base_flags
end
end
end
end
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