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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 "chef/mixin/powershell_exec"
require_relative "auth_credentials"
require_relative "../exceptions"
require_relative "../win32/registry"
autoload :OpenSSL, "openssl"
class Chef
class HTTP
class Authenticator
DEFAULT_SERVER_API_VERSION = "2".freeze
extend Chef::Mixin::PowershellExec
attr_reader :signing_key_filename
attr_reader :raw_key
attr_reader :attr_names
attr_reader :auth_credentials
attr_reader :version_class
attr_reader :api_version
attr_accessor :sign_request
def initialize(opts = {})
@raw_key = nil
@sign_request = true
@signing_key_filename = opts[:signing_key_filename]
@key = load_signing_key(opts[:signing_key_filename], opts[:raw_key])
@auth_credentials = AuthCredentials.new(opts[:client_name], @key, use_ssh_agent: opts[:ssh_agent_signing])
@version_class = opts[:version_class]
@api_version = opts[:api_version]
end
def handle_request(method, url, headers = {}, data = false)
headers["X-Ops-Server-API-Version"] = request_version
headers.merge!(authentication_headers(method, url, data, headers)) if sign_requests?
[method, url, headers, data]
end
def handle_response(http_response, rest_request, return_value)
[http_response, rest_request, return_value]
end
def stream_response_handler(response)
nil
end
def handle_stream_complete(http_response, rest_request, return_value)
[http_response, rest_request, return_value]
end
def request_version
if version_class
version_class.best_request_version
elsif api_version
api_version
elsif Chef::ServerAPIVersions.instance.negotiated?
Chef::ServerAPIVersions.instance.max_server_version.to_s
else
DEFAULT_SERVER_API_VERSION
end
end
def sign_requests?
auth_credentials.sign_requests? && @sign_request
end
def client_name
@auth_credentials.client_name
end
def detect_certificate_key(client_name)
self.class.detect_certificate_key(client_name)
end
def check_certstore_for_key(client_name)
self.class.check_certstore_for_key(client_name)
end
def retrieve_certificate_key(client_name)
self.class.retrieve_certificate_key(client_name)
end
def get_cert_password
self.class.get_cert_password
end
def encrypt_pfx_pass_with_vector
self.class.encrypt_pfx_pass_with_vector
end
def decrypt_pfx_pass_with_vector
self.class.decrypt_pfx_pass_with_vector
end
# Detects if a private key exists in a certificate repository like Keychain (macOS) or Certificate Store (Windows)
#
# @param client_name - we're using the node name to store and retrieve any keys
# Returns true if a key is found, false if not. False will trigger a registration event which will lead to a certificate based key being created
#
def self.detect_certificate_key(client_name)
if ChefUtils.windows?
check_certstore_for_key(client_name)
else # generic return for Mac and LInux clients
false
end
end
def self.get_cert_user
Chef::Config[:auth_key_registry_type] == "user" ? store = "CurrentUser" : store = "LocalMachine"
end
def self.get_registry_user
Chef::Config[:auth_key_registry_type] == "user" ? store = "HKEY_CURRENT_USER" : store = "HKEY_LOCAL_MACHINE"
end
def self.check_certstore_for_key(client_name)
store = get_cert_user
powershell_code = <<~CODE
$cert = Get-ChildItem -path cert:\\#{store}\\My -Recurse -Force | Where-Object { $_.Subject -Match "chef-#{client_name}" } -ErrorAction Stop
if (($cert.HasPrivateKey -eq $true) -and ($cert.PrivateKey.Key.ExportPolicy -ne "NonExportable")) {
return $true
}
else{
return $false
}
CODE
powershell_exec!(powershell_code).result
end
def load_signing_key(key_file, raw_key = nil)
results = retrieve_certificate_key(Chef::Config[:node_name])
if !!results
@raw_key = results
elsif key_file == nil? && raw_key == nil?
puts "\nNo key detected\n"
elsif !!key_file
@raw_key = IO.read(key_file).strip
elsif !!raw_key
@raw_key = raw_key.strip
else
return
end
# Pass in '' as the passphrase to avoid OpenSSL prompting on the TTY if
# given an encrypted key. This also helps if using a single file for
# both the public and private key with ssh-agent mode.
@key = OpenSSL::PKey::RSA.new(@raw_key, "")
rescue SystemCallError, IOError => e
Chef::Log.warn "Failed to read the private key #{key_file}: #{e.inspect}"
raise Chef::Exceptions::PrivateKeyMissing, "I cannot read #{key_file}, which you told me to use to sign requests!"
rescue OpenSSL::PKey::RSAError
msg = "The file #{key_file} or :raw_key option does not contain a correctly formatted private key or the key is encrypted.\n"
msg << "The key file should begin with '-----BEGIN RSA PRIVATE KEY-----' and end with '-----END RSA PRIVATE KEY-----'"
raise Chef::Exceptions::InvalidPrivateKey, msg
end
def self.get_cert_password
store = get_registry_user
@win32registry = Chef::Win32::Registry.new
path = "#{store}\\Software\\Progress\\Authentication"
# does the registry key even exist?
# password_blob should be an array of hashes
password_blob = @win32registry.get_values(path)
if password_blob.nil? || password_blob.empty?
raise Chef::Exceptions::Win32RegKeyMissing
end
# Did someone have just the password stored in the registry?
raw_data = password_blob.map { |x| x[:data] }
vector = raw_data[2]
if !!vector
decrypted_password = decrypt_pfx_pass_with_vector(password_blob)
else
decrypted_password = decrypt_pfx_pass_with_password(password_blob)
if !!decrypted_password
migrate_pass_to_use_vector(decrypted_password)
else
Chef::Log.error("Failed to retrieve certificate password")
end
end
decrypted_password
rescue Chef::Exceptions::Win32RegKeyMissing
# if we don't have a password, log that and generate one
store = get_registry_user
new_path = "#{store}\\Software\\Progress\\Authentication"
unless @win32registry.key_exists?(new_path)
@win32registry.create_key(new_path, true)
end
create_and_store_new_password
end
def self.encrypt_pfx_pass_with_vector(password)
powershell_code = <<~CODE
$AES = [System.Security.Cryptography.Aes]::Create()
$key_temp = [System.Convert]::ToBase64String($AES.Key)
$iv_temp = [System.Convert]::ToBase64String($AES.IV)
$encryptor = $AES.CreateEncryptor()
[System.Byte[]]$Bytes = [System.Text.Encoding]::Unicode.GetBytes("#{password}")
$EncryptedBytes = $encryptor.TransformFinalBlock($Bytes,0,$Bytes.Length)
$EncryptedBase64String = [System.Convert]::ToBase64String($EncryptedBytes)
# create array of encrypted pass, key, iv
$password_blob = @($EncryptedBase64String, $key_temp, $iv_temp)
return $password_blob
CODE
powershell_exec!(powershell_code).result
end
def self.decrypt_pfx_pass_with_vector(password_blob)
raw_data = password_blob.map { |x| x[:data] }
password = raw_data[0]
key = raw_data[1]
vector = raw_data[2]
powershell_code = <<~CODE
$KeyBytes = [System.Convert]::FromBase64String("#{key}")
$IVBytes = [System.Convert]::FromBase64String("#{vector}")
$aes = [System.Security.Cryptography.Aes]::Create()
$aes.Key = $KeyBytes
$aes.IV = $IVBytes
$EncryptedBytes = [System.Convert]::FromBase64String("#{password}")
$Decryptor = $aes.CreateDecryptor()
$DecryptedBytes = $Decryptor.TransformFinalBlock($EncryptedBytes,0,$EncryptedBytes.Length)
$DecryptedString = [System.Text.Encoding]::Unicode.GetString($DecryptedBytes)
return $DecryptedString
CODE
results = powershell_exec!(powershell_code).result
end
def self.decrypt_pfx_pass_with_password(password_blob)
password = ""
password_blob.each do |secret|
if secret[:name] == "PfxPass"
password = secret[:data]
else
Chef::Log.error("Failed to retrieve a password for the private key")
end
end
powershell_code = <<~CODE
$secure_string = "#{password}" | ConvertTo-SecureString
$string = [Runtime.InteropServices.Marshal]::PtrToStringAuto([Runtime.InteropServices.Marshal]::SecureStringToBSTR((($secure_string))))
return $string
CODE
powershell_exec!(powershell_code).result
end
def self.migrate_pass_to_use_vector(password)
store = get_cert_user
corrected_store = (store == "CurrentUser" ? "HKCU" : "HKLM")
powershell_code = <<~CODE
Remove-ItemProperty -Path "#{corrected_store}:\\Software\\Progress\\Authentication" -Name "PfXPass"
CODE
powershell_exec!(powershell_code)
create_and_store_new_password(password)
end
# This method name is a bit of a misnomer. We call it to legit create a new password using the vector format.
# But we also call it with a password that needs to be migrated to use the vector format too.
def self.create_and_store_new_password(password = nil)
@win32registry = Chef::Win32::Registry.new
store = get_registry_user
path = "#{store}\\Software\\Progress\\Authentication"
if password.nil?
require "securerandom" unless defined?(SecureRandom)
size = 14
password = SecureRandom.alphanumeric(size)
end
encrypted_blob = encrypt_pfx_pass_with_vector(password)
encrypted_password = encrypted_blob[0]
key = encrypted_blob[1]
vector = encrypted_blob[2]
values = [
{ name: "PfxPass", type: :string, data: encrypted_password },
{ name: "PfxKey", type: :string, data: key },
{ name: "PfxIV", type: :string, data: vector },
]
values.each do |i|
@win32registry.set_value(path, i)
end
password
end
def self.retrieve_certificate_key(client_name)
if ChefUtils.windows?
require "openssl" unless defined?(OpenSSL)
password = get_cert_password
return false unless password
if !!check_certstore_for_key(client_name)
ps_blob = powershell_exec!(get_the_key_ps(client_name, password)).result
file_path = ps_blob["PSPath"].split("::")[1]
pkcs = OpenSSL::PKCS12.new(File.binread(file_path), password)
# We check the pfx we just extracted the private key from
# if that cert is expiring in 7 days or less we generate a new pfx/p12 object
# then we post the new public key from that to the client endpoint on
# chef server.
File.delete(file_path)
key_expiring = is_certificate_expiring?(pkcs)
if key_expiring
powershell_exec!(delete_old_key_ps(client_name))
::Chef::Client.update_key_and_register(Chef::Config[:client_name], pkcs)
end
return pkcs.key.private_to_pem
end
end
false
end
def self.is_certificate_expiring?(pkcs)
today = Date.parse(Time.now.utc.iso8601)
future = Date.parse(pkcs.certificate.not_after.iso8601)
future.mjd - today.mjd <= 7
end
def self.get_the_key_ps(client_name, password)
store = get_cert_user
powershell_code = <<~CODE
Try {
$my_pwd = ConvertTo-SecureString -String "#{password}" -Force -AsPlainText;
$cert = Get-ChildItem -path cert:\\#{store}\\My -Recurse | Where-Object { $_.Subject -match "chef-#{client_name}$" } -ErrorAction Stop;
$tempfile = [System.IO.Path]::GetTempPath() + "export_pfx.pfx";
Export-PfxCertificate -Cert $cert -Password $my_pwd -FilePath $tempfile;
}
Catch {
return $false
}
CODE
end
def self.delete_old_key_ps(client_name)
store = get_cert_user
powershell_code = <<~CODE
Get-ChildItem -path cert:\\#{store}\\My -Recurse | Where-Object { $_.Subject -match "chef-#{client_name}$" } | Remove-Item -ErrorAction Stop;
CODE
end
def authentication_headers(method, url, json_body = nil, headers = nil)
request_params = {
http_method: method,
path: url.path,
body: json_body,
host: "#{url.host}:#{url.port}",
headers: headers,
}
request_params[:body] ||= ""
auth_credentials.signature_headers(request_params)
end
end
end
end
|