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Adds support to reset windows passwords on Google provided images
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154
lib/fog/compute/google/requests/reset_windows_password.rb
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# Copyright 2015 Google Inc. All Rights Reserved. | ||
# | ||
# 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. | ||
# | ||
# Changes: | ||
# March 2020: Modified example found here: | ||
# https://github.com/GoogleCloudPlatform/compute-image-windows/blob/master/examples/windows_auth_python_sample.py | ||
# to enable fog-google to change windows passwords. | ||
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require "openssl" | ||
require "base64" | ||
require "json" | ||
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module Fog | ||
module Compute | ||
class Google | ||
class Mock | ||
def reset_windows_password(_server:, _user:) | ||
Fog::Mock.not_implemented | ||
end | ||
end | ||
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class Real | ||
## | ||
# Resets Windows passwords for users on Google's Windows based images. Code based on Google provided example. | ||
# | ||
# @param instance [String] the name of the instance | ||
# @param zone [String] the name of the zone of the instance | ||
# @param user [String] the user whose password should be reset | ||
# | ||
# @return [String] new password | ||
# | ||
# @see https://cloud.google.com/compute/docs/instances/windows/automate-pw-generation | ||
def reset_windows_password(server:, user:) | ||
# Pull the e-mail address of user authenticated to API | ||
email = @compute.request_options.authorization.issuer | ||
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# Create a new key | ||
key = OpenSSL::PKey::RSA.new(2048) | ||
modulus, exponent = get_modulus_exponent_in_base64(key) | ||
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# Get Old Metadata | ||
old_metadata = server.metadata | ||
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# Create JSON Object with needed information | ||
metadata_entry = get_json_string(user, modulus, exponent, email) | ||
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# Create new metadata object | ||
new_metadata = update_windows_keys(old_metadata, metadata_entry) | ||
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# Set metadata on instance | ||
server.set_metadata(new_metadata, false) | ||
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# Get encrypted password from Serial Port 4 Output | ||
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# If machine is booting for the first time, there appears to be a | ||
# delay before the password appears on the serial port. | ||
sleep(1) until server.ready? | ||
serial_port_output = server.serial_port_output(:port => 4) | ||
loop_cnt = 0 | ||
while serial_port_output.empty? | ||
if loop_cnt > 12 | ||
Fog::Logger.warning("Encrypted password never found on Serial Output Port 4") | ||
raise "Could not reset password." | ||
end | ||
sleep(5) | ||
serial_port_output = server.serial_port_output(:port => 4) | ||
loop_cnt += 1 | ||
end | ||
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# Parse and decrypt password | ||
enc_password = get_encrypted_password_from_serial_port(serial_port_output, modulus) | ||
password = decrypt_password(enc_password, key) | ||
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return password | ||
end | ||
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def get_modulus_exponent_in_base64(key) | ||
mod = [key.n.to_s(16)].pack("H*").strip | ||
exp = [key.e.to_s(16)].pack("H*").strip | ||
modulus = Base64.strict_encode64(mod).strip | ||
exponent = Base64.strict_encode64(exp).strip | ||
return modulus, exponent | ||
end | ||
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def get_expiration_time_string | ||
utc_now = Time.now.utc | ||
expire_time = utc_now + 5 * 60 | ||
return expire_time.strftime("%Y-%m-%dT%H:%M:%SZ") | ||
end | ||
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def get_json_string(user, modulus, exponent, email) | ||
expire = get_expiration_time_string | ||
data = { 'userName': user, | ||
'modulus': modulus, | ||
'exponent': exponent, | ||
'email': email, | ||
'expireOn': expire } | ||
return ::JSON.dump(data) | ||
end | ||
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def update_windows_keys(old_metadata, metadata_entry) | ||
if old_metadata[:items] | ||
new_metadata = Hash[old_metadata[:items].map { |item| [item[:key], item[:value]] }] | ||
else | ||
new_metadata = {} | ||
end | ||
new_metadata["windows-keys"] = metadata_entry | ||
return new_metadata | ||
end | ||
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def get_encrypted_password_from_serial_port(serial_port_output, modulus) | ||
output = serial_port_output.split("\n") | ||
output.reverse_each do |line| | ||
begin | ||
if line.include?("modulus") && line.include?("encryptedPassword") | ||
entry = ::JSON.parse(line) | ||
if modulus == entry["modulus"] | ||
return entry["encryptedPassword"] | ||
end | ||
else | ||
next | ||
end | ||
rescue ::JSON::ParserError | ||
Fog::Logger.warning("Parsing encrypted password from serial output | ||
failed. Trying to parse next matching line.") | ||
next | ||
end | ||
end | ||
end | ||
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def decrypt_password(enc_password, key) | ||
decoded_password = Base64.strict_decode64(enc_password) | ||
begin | ||
return key.private_decrypt(decoded_password, OpenSSL::PKey::RSA::PKCS1_OAEP_PADDING) | ||
rescue OpenSSL::PKey::RSAError | ||
Fog::Logger.warning("Error decrypting password received from Google. | ||
Maybe check output on Serial Port 4 and Metadata key: windows-keys?") | ||
end | ||
end | ||
end | ||
end | ||
end | ||
end |
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