--- /dev/null
+require 'openssl'
+require 'base64'
+require 'digest/sha1'
+
+module MCollective
+ # A class that assists in encrypting and decrypting data using a
+ # combination of RSA and AES
+ #
+ # Data will be AES encrypted for speed, the Key used in # the AES
+ # stage will be encrypted using RSA
+ #
+ # ssl = SSL.new(public_key, private_key, passphrase)
+ #
+ # data = File.read("largefile.dat")
+ #
+ # crypted_data = ssl.encrypt_with_private(data)
+ #
+ # pp crypted_data
+ #
+ # This will result in a hash of data like:
+ #
+ # crypted = {:key => "crd4NHvG....=",
+ # :data => "XWXlqN+i...=="}
+ #
+ # The key and data will all be base 64 encoded already by default
+ # you can pass a 2nd parameter as false to encrypt_with_private and
+ # counterparts that will prevent the base 64 encoding
+ #
+ # You can pass the data hash into ssl.decrypt_with_public which
+ # should return your original data
+ #
+ # There are matching methods for using a public key to encrypt
+ # data to be decrypted using a private key
+ class SSL
+ attr_reader :public_key_file, :private_key_file, :ssl_cipher
+
+ def initialize(pubkey=nil, privkey=nil, passphrase=nil, cipher=nil)
+ @public_key_file = pubkey
+ @private_key_file = privkey
+
+ @public_key = read_key(:public, pubkey)
+ @private_key = read_key(:private, privkey, passphrase)
+
+ @ssl_cipher = "aes-256-cbc"
+ @ssl_cipher = Config.instance.ssl_cipher if Config.instance.ssl_cipher
+ @ssl_cipher = cipher if cipher
+
+ raise "The supplied cipher '#{@ssl_cipher}' is not supported" unless OpenSSL::Cipher.ciphers.include?(@ssl_cipher)
+ end
+
+ # Encrypts supplied data using AES and then encrypts using RSA
+ # the key and IV
+ #
+ # Return a hash with everything optionally base 64 encoded
+ def encrypt_with_public(plain_text, base64=true)
+ crypted = aes_encrypt(plain_text)
+
+ if base64
+ key = base64_encode(rsa_encrypt_with_public(crypted[:key]))
+ data = base64_encode(crypted[:data])
+ else
+ key = rsa_encrypt_with_public(crypted[:key])
+ data = crypted[:data]
+ end
+
+ {:key => key, :data => data}
+ end
+
+ # Encrypts supplied data using AES and then encrypts using RSA
+ # the key and IV
+ #
+ # Return a hash with everything optionally base 64 encoded
+ def encrypt_with_private(plain_text, base64=true)
+ crypted = aes_encrypt(plain_text)
+
+ if base64
+ key = base64_encode(rsa_encrypt_with_private(crypted[:key]))
+ data = base64_encode(crypted[:data])
+ else
+ key = rsa_encrypt_with_private(crypted[:key])
+ data = crypted[:data]
+ end
+
+ {:key => key, :data => data}
+ end
+
+ # Decrypts data, expects a hash as create with crypt_with_public
+ def decrypt_with_private(crypted, base64=true)
+ raise "Crypted data should include a key" unless crypted.include?(:key)
+ raise "Crypted data should include data" unless crypted.include?(:data)
+
+ if base64
+ key = rsa_decrypt_with_private(base64_decode(crypted[:key]))
+ aes_decrypt(key, base64_decode(crypted[:data]))
+ else
+ key = rsa_decrypt_with_private(crypted[:key])
+ aes_decrypt(key, crypted[:data])
+ end
+ end
+
+ # Decrypts data, expects a hash as create with crypt_with_private
+ def decrypt_with_public(crypted, base64=true)
+ raise "Crypted data should include a key" unless crypted.include?(:key)
+ raise "Crypted data should include data" unless crypted.include?(:data)
+
+ if base64
+ key = rsa_decrypt_with_public(base64_decode(crypted[:key]))
+ aes_decrypt(key, base64_decode(crypted[:data]))
+ else
+ key = rsa_decrypt_with_public(crypted[:key])
+ aes_decrypt(key, crypted[:data])
+ end
+ end
+
+ # Use the public key to RSA encrypt data
+ def rsa_encrypt_with_public(plain_string)
+ raise "No public key set" unless @public_key
+
+ @public_key.public_encrypt(plain_string)
+ end
+
+ # Use the private key to RSA decrypt data
+ def rsa_decrypt_with_private(crypt_string)
+ raise "No private key set" unless @private_key
+
+ @private_key.private_decrypt(crypt_string)
+ end
+
+ # Use the private key to RSA encrypt data
+ def rsa_encrypt_with_private(plain_string)
+ raise "No private key set" unless @private_key
+
+ @private_key.private_encrypt(plain_string)
+ end
+
+ # Use the public key to RSA decrypt data
+ def rsa_decrypt_with_public(crypt_string)
+ raise "No public key set" unless @public_key
+
+ @public_key.public_decrypt(crypt_string)
+ end
+
+ # encrypts a string, returns a hash of key, iv and data
+ def aes_encrypt(plain_string)
+ cipher = OpenSSL::Cipher::Cipher.new(ssl_cipher)
+ cipher.encrypt
+
+ key = cipher.random_key
+
+ cipher.key = key
+ cipher.pkcs5_keyivgen(key)
+ encrypted_data = cipher.update(plain_string) + cipher.final
+
+ {:key => key, :data => encrypted_data}
+ end
+
+ # decrypts a string given key, iv and data
+ def aes_decrypt(key, crypt_string)
+ cipher = OpenSSL::Cipher::Cipher.new(ssl_cipher)
+
+ cipher.decrypt
+ cipher.key = key
+ cipher.pkcs5_keyivgen(key)
+ decrypted_data = cipher.update(crypt_string) + cipher.final
+ end
+
+ # Signs a string using the private key
+ def sign(string, base64=false)
+ sig = @private_key.sign(OpenSSL::Digest::SHA1.new, string)
+
+ base64 ? base64_encode(sig) : sig
+ end
+
+ # Using the public key verifies that a string was signed using the private key
+ def verify_signature(signature, string, base64=false)
+ signature = base64_decode(signature) if base64
+
+ @public_key.verify(OpenSSL::Digest::SHA1.new, signature, string)
+ end
+
+ # base 64 encode a string
+ def base64_encode(string)
+ SSL.base64_encode(string)
+ end
+
+ def self.base64_encode(string)
+ Base64.encode64(string)
+ end
+
+ # base 64 decode a string
+ def base64_decode(string)
+ SSL.base64_decode(string)
+ end
+
+ def self.base64_decode(string)
+ Base64.decode64(string)
+ end
+
+ def md5(string)
+ SSL.md5(string)
+ end
+
+ def self.md5(string)
+ Digest::MD5.hexdigest(string)
+ end
+
+ # Creates a RFC 4122 version 5 UUID. If string is supplied it will produce repeatable
+ # UUIDs for that string else a random 128bit string will be used from OpenSSL::BN
+ #
+ # Code used with permission from:
+ # https://github.com/kwilczynski/puppet-functions/blob/master/lib/puppet/parser/functions/uuid.rb
+ #
+ def self.uuid(string=nil)
+ string ||= OpenSSL::Random.random_bytes(16).unpack('H*').shift
+
+ uuid_name_space_dns = "\x6b\xa7\xb8\x10\x9d\xad\x11\xd1\x80\xb4\x00\xc0\x4f\xd4\x30\xc8"
+
+ sha1 = Digest::SHA1.new
+ sha1.update(uuid_name_space_dns)
+ sha1.update(string)
+
+ # first 16 bytes..
+ bytes = sha1.digest[0, 16].bytes.to_a
+
+ # version 5 adjustments
+ bytes[6] &= 0x0f
+ bytes[6] |= 0x50
+
+ # variant is DCE 1.1
+ bytes[8] &= 0x3f
+ bytes[8] |= 0x80
+
+ bytes = [4, 2, 2, 2, 6].collect do |i|
+ bytes.slice!(0, i).pack('C*').unpack('H*')
+ end
+
+ bytes.join('-')
+ end
+
+ # Reads either a :public or :private key from disk, uses an
+ # optional passphrase to read the private key
+ def read_key(type, key=nil, passphrase=nil)
+ return key if key.nil?
+
+ raise "Could not find key #{key}" unless File.exist?(key)
+ raise "#{type} key file '#{key}' is empty" if File.zero?(key)
+
+ if type == :public
+ begin
+ key = OpenSSL::PKey::RSA.new(File.read(key))
+ rescue OpenSSL::PKey::RSAError
+ key = OpenSSL::X509::Certificate.new(File.read(key)).public_key
+ end
+
+ # Ruby < 1.9.3 had a bug where it does not correctly clear the
+ # queue of errors while reading a key. It tries various ways
+ # to read the key and each failing attempt pushes an error onto
+ # the queue. With pubkeys only the 3rd attempt pass leaving 2
+ # stale errors on the error queue.
+ #
+ # In 1.9.3 they fixed this by simply discarding the errors after
+ # every attempt. So we simulate this fix here for older rubies
+ # as without it we get SSL_read errors from the Stomp+TLS sessions
+ #
+ # We do this only on 1.8 relying on 1.9.3 to do the right thing
+ # and we do not support 1.9 less than 1.9.3
+ #
+ # See http://bugs.ruby-lang.org/issues/4550
+ OpenSSL.errors if Util.ruby_version =~ /^1.8/
+
+ return key
+ elsif type == :private
+ return OpenSSL::PKey::RSA.new(File.read(key), passphrase)
+ else
+ raise "Can only load :public or :private keys"
+ end
+ end
+
+ end
+end
Code Review / packages / precise / mcollective.git / blobdiff