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# -*- coding: utf-8 -*-
# test_crypto.py
# Copyright (C) 2013 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Tests for cryptographic related stuff.
"""
import os
import hashlib
import binascii
from leap.soledad.client import crypto
from leap.soledad.common.document import SoledadDocument
from leap.soledad.common.tests.util import BaseSoledadTest
from leap.soledad.common.crypto import WrongMacError
from leap.soledad.common.crypto import UnknownMacMethodError
from leap.soledad.common.crypto import ENC_JSON_KEY
from leap.soledad.common.crypto import ENC_SCHEME_KEY
from leap.soledad.common.crypto import MAC_KEY
from leap.soledad.common.crypto import MAC_METHOD_KEY
class EncryptedSyncTestCase(BaseSoledadTest):
"""
Tests that guarantee that data will always be encrypted when syncing.
"""
def test_encrypt_decrypt_json(self):
"""
Test encrypting and decrypting documents.
"""
simpledoc = {'key': 'val'}
doc1 = SoledadDocument(doc_id='id')
doc1.content = simpledoc
# encrypt doc
doc1.set_json(self._soledad._crypto.encrypt_doc(doc1))
# assert content is different and includes keys
self.assertNotEqual(
simpledoc, doc1.content,
'incorrect document encryption')
self.assertTrue(ENC_JSON_KEY in doc1.content)
self.assertTrue(ENC_SCHEME_KEY in doc1.content)
# decrypt doc
doc1.set_json(self._soledad._crypto.decrypt_doc(doc1))
self.assertEqual(
simpledoc, doc1.content, 'incorrect document encryption')
class RecoveryDocumentTestCase(BaseSoledadTest):
def test_dump_recovery_document_raw(self):
rd = self._soledad.secrets._dump_recovery_document()
secret_id = rd[self._soledad.secrets.STORAGE_SECRETS_KEY].items()[0][0]
# assert exported secret is the same
secret = self._soledad.secrets._decrypt_storage_secret_version_1(
rd[self._soledad.secrets.STORAGE_SECRETS_KEY][secret_id])
self.assertEqual(secret_id, self._soledad.secrets._secret_id)
self.assertEqual(secret, self._soledad.secrets._secrets[secret_id])
# assert recovery document structure
encrypted_secret = rd[
self._soledad.secrets.STORAGE_SECRETS_KEY][secret_id]
self.assertTrue(self._soledad.secrets.CIPHER_KEY in encrypted_secret)
self.assertTrue(
encrypted_secret[self._soledad.secrets.CIPHER_KEY] == 'aes256')
self.assertTrue(self._soledad.secrets.LENGTH_KEY in encrypted_secret)
self.assertTrue(self._soledad.secrets.SECRET_KEY in encrypted_secret)
def test_load_recovery_document(self):
rd = self._soledad.secrets._dump_recovery_document()
s = self._soledad_instance()
s.secrets._load_recovery_document(rd)
s.secrets.set_secret_id(self._soledad.secrets._secret_id)
self.assertEqual(self._soledad.storage_secret,
s.storage_secret,
'Failed settinng secret for symmetric encryption.')
s.close()
class SoledadSecretsTestCase(BaseSoledadTest):
def test_new_soledad_instance_generates_one_secret(self):
self.assertTrue(
self._soledad.storage_secret is not None,
"Expected secret to be something different than None")
number_of_secrets = len(self._soledad.secrets._secrets)
self.assertTrue(
number_of_secrets == 1,
"Expected exactly 1 secret, got %d instead." % number_of_secrets)
def test_generated_secret_is_of_correct_type(self):
expected_type = str
self.assertIsInstance(
self._soledad.storage_secret, expected_type,
"Expected secret to be of type %s" % expected_type)
def test_generated_secret_has_correct_lengt(self):
expected_length = self._soledad.secrets.GEN_SECRET_LENGTH
actual_length = len(self._soledad.storage_secret)
self.assertTrue(
expected_length == actual_length,
"Expected secret with length %d, got %d instead."
% (expected_length, actual_length))
def test_generated_secret_id_is_sha256_hash_of_secret(self):
generated = self._soledad.secrets.secret_id
expected = hashlib.sha256(self._soledad.storage_secret).hexdigest()
self.assertTrue(
generated == expected,
"Expeceted generated secret id to be sha256 hash, got something "
"else instead.")
def test_generate_new_secret_generates_different_secret_id(self):
# generate new secret
secret_id_1 = self._soledad.secrets.secret_id
secret_id_2 = self._soledad.secrets._gen_secret()
self.assertTrue(
len(self._soledad.secrets._secrets) == 2,
"Expected exactly 2 secrets.")
self.assertTrue(
secret_id_1 != secret_id_2,
"Expected IDs of secrets to be distinct.")
self.assertTrue(
secret_id_1 in self._soledad.secrets._secrets,
"Expected to find ID of first secret in Soledad Secrets.")
self.assertTrue(
secret_id_2 in self._soledad.secrets._secrets,
"Expected to find ID of second secret in Soledad Secrets.")
def test__has_secret(self):
self.assertTrue(
self._soledad._secrets._has_secret(),
"Should have a secret at this point")
class MacAuthTestCase(BaseSoledadTest):
def test_decrypt_with_wrong_mac_raises(self):
"""
Trying to decrypt a document with wrong MAC should raise.
"""
simpledoc = {'key': 'val'}
doc = SoledadDocument(doc_id='id')
doc.content = simpledoc
# encrypt doc
doc.set_json(self._soledad._crypto.encrypt_doc(doc))
self.assertTrue(MAC_KEY in doc.content)
self.assertTrue(MAC_METHOD_KEY in doc.content)
# mess with MAC
doc.content[MAC_KEY] = '1234567890ABCDEF'
# try to decrypt doc
self.assertRaises(
WrongMacError,
self._soledad._crypto.decrypt_doc, doc)
def test_decrypt_with_unknown_mac_method_raises(self):
"""
Trying to decrypt a document with unknown MAC method should raise.
"""
simpledoc = {'key': 'val'}
doc = SoledadDocument(doc_id='id')
doc.content = simpledoc
# encrypt doc
doc.set_json(self._soledad._crypto.encrypt_doc(doc))
self.assertTrue(MAC_KEY in doc.content)
self.assertTrue(MAC_METHOD_KEY in doc.content)
# mess with MAC method
doc.content[MAC_METHOD_KEY] = 'mymac'
# try to decrypt doc
self.assertRaises(
UnknownMacMethodError,
self._soledad._crypto.decrypt_doc, doc)
class SoledadCryptoAESTestCase(BaseSoledadTest):
def test_encrypt_decrypt_sym(self):
# generate 256-bit key
key = os.urandom(32)
iv, cyphertext = crypto.encrypt_sym('data', key)
self.assertTrue(cyphertext is not None)
self.assertTrue(cyphertext != '')
self.assertTrue(cyphertext != 'data')
plaintext = crypto.decrypt_sym(cyphertext, key, iv)
self.assertEqual('data', plaintext)
def test_decrypt_with_wrong_iv_fails(self):
key = os.urandom(32)
iv, cyphertext = crypto.encrypt_sym('data', key)
self.assertTrue(cyphertext is not None)
self.assertTrue(cyphertext != '')
self.assertTrue(cyphertext != 'data')
# get a different iv by changing the first byte
rawiv = binascii.a2b_base64(iv)
wrongiv = rawiv
while wrongiv == rawiv:
wrongiv = os.urandom(1) + rawiv[1:]
plaintext = crypto.decrypt_sym(
cyphertext, key, iv=binascii.b2a_base64(wrongiv))
self.assertNotEqual('data', plaintext)
def test_decrypt_with_wrong_key_fails(self):
key = os.urandom(32)
iv, cyphertext = crypto.encrypt_sym('data', key)
self.assertTrue(cyphertext is not None)
self.assertTrue(cyphertext != '')
self.assertTrue(cyphertext != 'data')
wrongkey = os.urandom(32) # 256-bits key
# ensure keys are different in case we are extremely lucky
while wrongkey == key:
wrongkey = os.urandom(32)
plaintext = crypto.decrypt_sym(cyphertext, wrongkey, iv)
self.assertNotEqual('data', plaintext)
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