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authordrebs <drebs@leap.se>2012-12-24 12:39:35 -0200
committerdrebs <drebs@leap.se>2012-12-24 12:39:35 -0200
commit15a5b15cf1a03cc3fbb68bfccf4cd32af8479f2a (patch)
tree497800d61acc7884ec522d79f3b15350d204b8b2 /src
parent7ad507d24ee8c6f38d527c298311159594922658 (diff)
Load local u1db encrypted database.
Diffstat (limited to 'src')
-rw-r--r--src/leap/soledad/__init__.py84
1 files changed, 81 insertions, 3 deletions
diff --git a/src/leap/soledad/__init__.py b/src/leap/soledad/__init__.py
index 6a3707ea..f0d1cbb9 100644
--- a/src/leap/soledad/__init__.py
+++ b/src/leap/soledad/__init__.py
@@ -7,13 +7,18 @@ import string
import random
import cStringIO
import hmac
+from backends import sqlcipher
from soledad.util import GPGWrapper
class Soledad(object):
- PREFIX = os.environ['HOME'] + '/.config/leap/soledad'
- SECRET_PATH = PREFIX + '/secret.gpg'
- GNUPG_HOME = PREFIX + '/gnupg'
+ # paths
+ PREFIX = os.environ['HOME'] + '/.config/leap/soledad'
+ SECRET_PATH = PREFIX + '/secret.gpg'
+ GNUPG_HOME = PREFIX + '/gnupg'
+ U1DB_PATH = PREFIX + '/soledad.u1db'
+
+ # other configs
SECRET_LENGTH = 50
def __init__(self, user_email, gpghome=None):
@@ -31,13 +36,29 @@ class Soledad(object):
if not self._has_secret():
self._gen_secret()
self._load_secret()
+ # instantiate u1db
+ # TODO: verify if secret for sqlcipher should be the same as the one
+ # for symmetric encryption.
+ self._db = sqlcipher.open(self.U1DB_PATH, True, self._secret)
+
+ #-------------------------------------------------------------------------
+ # Symmetric secret management
+ #-------------------------------------------------------------------------
def _has_secret(self):
+ """
+ Verify if secret for symmetric encryption exists on local encrypted file.
+ """
+ # TODO: verify if file is a GPG-encrypted file and if we have the
+ # corresponding private key for decryption.
if os.path.isfile(self.SECRET_PATH):
return True
return False
def _load_secret(self):
+ """
+ Load secret for symmetric encryption from local encrypted file.
+ """
try:
with open(self.SECRET_PATH) as f:
self._secret = str(self._gpg.decrypt(f.read()))
@@ -45,14 +66,24 @@ class Soledad(object):
raise IOError('Failed to open secret file %s.' % self.SECRET_PATH)
def _gen_secret(self):
+ """
+ Generate a secret for symmetric encryption and store 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()
+ #-------------------------------------------------------------------------
+ # OpenPGP keypair management
+ #-------------------------------------------------------------------------
def _has_openpgp_keypair(self):
+ """
+ Verify if there exists an OpenPGP keypair for this user.
+ """
+ # TODO: verify if we have the corresponding private key.
try:
self._gpg.find_key(self._user_email)
return True
@@ -60,6 +91,9 @@ class Soledad(object):
return False
def _gen_openpgp_keypair(self):
+ """
+ Generate and OpenPGP keypair for this user.
+ """
params = self._gpg.gen_key_input(
key_type='RSA',
key_length=4096,
@@ -69,19 +103,63 @@ class Soledad(object):
self._gpg.gen_key(params)
def _load_openpgp_keypair(self):
+ """
+ Find fingerprint for this user's OpenPGP keypair.
+ """
self._fingerprint = self._gpg.find_key(self._user_email)['fingerprint']
+ def publish_pubkey(self, keyserver):
+ pass
+
+ #-------------------------------------------------------------------------
+ # Data encryption/decryption
+ #-------------------------------------------------------------------------
+
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):
+ """
+ Encrypt data using symmetric 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):
+ """
+ Decrypt data using symmetric 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 in the local encrypted database.
+ """
+ pass
+
+ def get(self, doc_id):
+ """
+ Retrieve a document from the local encrypted database.
+ """
+ pass
+
+ def sync(self):
+ """
+ Synchronize the local encrypted database with LEAP server.
+ """
+ pass