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#
# Author:: Daniel DeLeo (<dan@chef.io>)
# Copyright:: Copyright (c) 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_relative "../knife"
class Chef
class Knife
class SslFetch < Chef::Knife
deps do
require_relative "../config"
require "pp" unless defined?(PP)
require "socket" unless defined?(Socket)
require "uri" unless defined?(URI)
require "openssl" unless defined?(OpenSSL)
require_relative "../mixin/proxified_socket"
include Chef::Mixin::ProxifiedSocket
end
banner "knife ssl fetch [URL] (options)"
def initialize(*args)
super
@uri = nil
end
def uri
@uri ||= begin
Chef::Log.trace("Checking SSL cert on #{given_uri}")
URI.parse(given_uri)
end
end
def given_uri
(name_args[0] || Chef::Config.chef_server_url)
end
def host
uri.host
end
def port
uri.port
end
def validate_uri
unless host && port
invalid_uri!
end
rescue URI::Error
invalid_uri!
end
def invalid_uri!
ui.error("Given URI: `#{given_uri}' is invalid")
show_usage
exit 1
end
def remote_cert_chain
tcp_connection = proxified_socket(host, port)
shady_ssl_connection = OpenSSL::SSL::SSLSocket.new(tcp_connection, noverify_peer_ssl_context)
shady_ssl_connection.connect
shady_ssl_connection.peer_cert_chain
end
def noverify_peer_ssl_context
@noverify_peer_ssl_context ||= begin
noverify_peer_context = OpenSSL::SSL::SSLContext.new
noverify_peer_context.verify_mode = OpenSSL::SSL::VERIFY_NONE
noverify_peer_context
end
end
def cn_of(certificate)
subject = certificate.subject
if cn_field_tuple = subject.to_a.find { |field| field[0] == "CN" }
cn_field_tuple[1]
else
nil
end
end
# Convert the CN of a certificate into something that will work well as a
# filename. To do so, all `*` characters are converted to the string
# "wildcard" and then all characters other than alphanumeric and hyphen
# characters are converted to underscores.
# NOTE: There is some confusion about what the CN will contain when
# using internationalized domain names. RFC 6125 mandates that the ascii
# representation be used, but it is not clear whether this is followed in
# practice.
# https://tools.ietf.org/html/rfc6125#section-6.4.2
def normalize_cn(cn)
cn.gsub("*", "wildcard").gsub(/[^[:alnum:]\-]/, "_")
end
def configuration
Chef::Config
end
def trusted_certs_dir
configuration.trusted_certs_dir
end
def write_cert(cert)
FileUtils.mkdir_p(trusted_certs_dir)
cn = cn_of(cert)
filename = cn.nil? ? "#{host}_#{Time.new.to_i}" : normalize_cn(cn)
full_path = File.join(trusted_certs_dir, "#{filename}.crt")
ui.msg("Adding certificate for #{filename} in #{full_path}")
File.open(full_path, File::CREAT | File::TRUNC | File::RDWR, 0644) do |f|
f.print(cert.to_s)
end
end
def run
validate_uri
ui.warn(<<~TRUST_TRUST)
Certificates from #{host} will be fetched and placed in your trusted_cert
directory (#{trusted_certs_dir}).
Knife has no means to verify these are the correct certificates. You should
verify the authenticity of these certificates after downloading.
TRUST_TRUST
remote_cert_chain.each do |cert|
write_cert(cert)
end
rescue OpenSSL::SSL::SSLError => e
# 'unknown protocol' usually means you tried to connect to a non-ssl
# service. We handle that specially here, any other error we let bubble
# up (probably a bug of some sort).
raise unless e.message.include?("unknown protocol")
ui.error("The service at the given URI (#{uri}) does not accept SSL connections")
if uri.scheme == "http"
https_uri = uri.to_s.sub(/^http/, "https")
ui.error("Perhaps you meant to connect to '#{https_uri}'?")
end
exit 1
end
end
end
end
|
