/usr/lib/one/ruby/ssh_auth.rb is in opennebula-tools 3.4.1-4.1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright 2002-2012, OpenNebula Project Leads (OpenNebula.org) #
# #
# 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 'pp'
require 'openssl'
require 'base64'
require 'fileutils'
# SSH key authentication class. It can be used as a driver for auth_mad
# as auth method is defined. It also holds some helper methods to be used
# by oneauth command
class SshAuth
LOGIN_PATH = ENV['HOME']+'/.one/one_ssh'
# Initialize SshAuth object
#
# @param [Hash] default options for path
# @option options [String] :public_key public key for the user
# @option options [String] :private_key key private key for the user.
def initialize(options={})
@private_key = nil
@public_key = nil
if options[:private_key]
begin
@private_key = File.read(options[:private_key])
rescue Exception => e
raise "Cannot read #{options[:private_key]}"
end
end
if options[:public_key]
@public_key = options[:public_key]
elsif @private_key != nil
# Init ssh keys using private key. public key is extracted in a
# format compatible with openssl. The public key does not contain
# "---- BEGIN/END RSA PUBLIC KEY ----" and is in a single line
key = OpenSSL::PKey::RSA.new(@private_key)
@public_key = key.public_key.to_pem.split("\n")
@public_key = @public_key.reject {|l| l.match(/RSA PUBLIC KEY/) }.join('')
end
if @private_key.nil? && @public_key.nil?
raise "You have to define at least one of the keys"
end
end
# Creates the login file for ssh authentication at ~/.one/one_ssh.
# By default it is valid for 1 hour but it can be changed to any number
# of seconds with expire parameter (in seconds)
def login(user, expire=3600)
expire ||= 3600
# Init proxy file path and creates ~/.one directory if needed
proxy_dir = File.dirname(LOGIN_PATH)
begin
FileUtils.mkdir_p(proxy_dir)
rescue Errno::EEXIST
end
# Generate security token
time = Time.now.to_i + expire.to_i
secret_plain = "#{user}:#{time}"
secret_crypted = encrypt(secret_plain)
proxy = "#{user}:#{secret_crypted}"
file = File.open(LOGIN_PATH, "w")
file.write(proxy)
file.close
File.chmod(0600,LOGIN_PATH)
secret_crypted
end
# Returns a valid password string to create a user using this auth driver.
# In this case the ssh public key.
def password
@public_key
end
# Checks the proxy created with the login method
def authenticate(user, token)
begin
token_plain = decrypt(token)
_user, time = token_plain.split(':')
if user == _user
if Time.now.to_i >= time.to_i
return "ssh proxy expired, login again to renew it"
else
return true
end
else
return "invalid credentials"
end
rescue
return "error"
end
end
private
###########################################################################
# Methods to handle ssh keys
###########################################################################
# Encrypts data with the private key of the user and returns
# base 64 encoded output in a single line
def encrypt(data)
rsa=OpenSSL::PKey::RSA.new(@private_key)
Base64::encode64(rsa.private_encrypt(data)).gsub!(/\n/, '').strip
end
# Decrypts base 64 encoded data with pub_key (public key)
def decrypt(data)
rsa=OpenSSL::PKey::RSA.new(Base64::decode64(@public_key))
rsa.public_decrypt(Base64::decode64(data))
end
end
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