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# License?
"""A U1DB implementation for using Object Stores as its persistence layer."""
import os
import string
import random
import cStringIO
import hmac
from util import GPGWrapper
class Soledad(object):
PREFIX = os.environ['HOME'] + '/.config/leap/soledad'
SECRET_PATH = PREFIX + '/secret.gpg'
GNUPG_HOME = PREFIX + '/gnupg'
SECRET_LENGTH = 50
def __init__(self, user_email, gpghome=None):
self._user_email = user_email
if not os.path.isdir(self.PREFIX):
os.makedirs(self.PREFIX)
if not gpghome:
gpghome = self.GNUPG_HOME
self._gpg = GPGWrapper(gpghome=gpghome)
# load/generate OpenPGP keypair
if not self._has_openpgp_keypair():
self._gen_openpgp_keypair()
self._load_openpgp_keypair()
# load/generate secret
if not self._has_secret():
self._gen_secret()
self._load_secret()
#-------------------------------------------------------------------------
# Management of secret for symmetric encryption
#-------------------------------------------------------------------------
def _has_secret(self):
"""
Verify if secret already exists in a local encrypted file.
"""
if os.path.isfile(self.SECRET_PATH):
return True
return False
def _load_secret(self):
"""
Load secret from local encrypted file.
"""
try:
with open(self.SECRET_PATH) as f:
self._secret = str(self._gpg.decrypt(f.read()))
except IOError as e:
raise IOError('Failed to open secret file %s.' % self.SECRET_PATH)
def _gen_secret(self):
"""
Generate secret for symmetric encryption and store it in a local encrypted file.
"""
self._secret = ''.join(random.choice(string.ascii_uppercase + string.digits) for x in range(self.SECRET_LENGTH))
ciphertext = self._gpg.encrypt(self._secret, self._fingerprint, self._fingerprint)
f = open(self.SECRET_PATH, 'w')
f.write(str(ciphertext))
f.close()
#-------------------------------------------------------------------------
# Management of OpenPGP keypair
#-------------------------------------------------------------------------
def _has_openpgp_keypair(self):
"""
Verify if a keypair exists for this user.
"""
# TODO: verify if private key exists.
try:
self._gpg.find_key(self._user_email)
return True
except LookupError:
return False
def _gen_openpgp_keypair(self):
"""
Generate a keypair for this user.
"""
params = self._gpg.gen_key_input(
key_type='RSA',
key_length=4096,
name_real=self._user_email,
name_email=self._user_email,
name_comment='Generated by LEAP Soledad.')
self._gpg.gen_key(params)
def _load_openpgp_keypair(self):
"""
Load the fingerprint for this user's keypair.
"""
self._fingerprint = self._gpg.find_key(self._user_email)['fingerprint']
def publish_pubkey(self, keyserver):
"""
Publish OpenPGP public key to a keyserver.
"""
pass
#-------------------------------------------------------------------------
# Data encryption and decription
#-------------------------------------------------------------------------
def encrypt(self, data, sign=None, passphrase=None, symmetric=False):
"""
Encrypt data.
"""
return str(self._gpg.encrypt(data, self._fingerprint, sign=sign,
passphrase=passphrase, symmetric=symmetric))
def encrypt_symmetric(self, doc_id, data, sign=None):
"""
Symmetrically encrypt data using this user's secret.
"""
h = hmac.new(self._secret, doc_id).hexdigest()
return self.encrypt(data, sign=sign, passphrase=h, symmetric=True)
def decrypt(self, data, passphrase=None, symmetric=False):
"""
Decrypt data.
"""
return str(self._gpg.decrypt(data, passphrase=passphrase))
def decrypt_symmetric(self, doc_id, data):
"""
Symmetrically decrypt data using this user's secret.
"""
h = hmac.new(self._secret, doc_id).hexdigest()
return self.decrypt(data, passphrase=h)
#-------------------------------------------------------------------------
# Document storage, retrieval and sync
#-------------------------------------------------------------------------
def put(self, doc_id, data):
"""
Store a document.
"""
pass
def get(self, doc_id):
"""
Retrieve a document.
"""
pass
def sync(self):
"""
Synchronize with LEAP server.
"""
pass
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