path: root/src/leap/common/tests/test_keymanager.py

## -*- coding: utf-8 -*-
# test_keymanager.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 the Key Manager.
"""


from mock import Mock
try:
    import simplejson as json
except ImportError:
    import json  # noqa


from leap.common.testing.basetest import BaseLeapTest
from leap.soledad import Soledad
from leap.soledad.crypto import SoledadCrypto


from leap.common.keymanager import (
    KeyManager,
    openpgp,
    KeyNotFound,
    NoPasswordGiven,
    TAGS_INDEX,
    TAGS_AND_PRIVATE_INDEX,
)
from leap.common.keymanager.openpgp import OpenPGPKey
from leap.common.keymanager.keys import (
    is_address,
    build_key_from_dict,
    keymanager_doc_id,
)
from leap.common.keymanager import errors


ADDRESS = 'leap@leap.se'
ADDRESS_2 = 'anotheruser@leap.se'


class KeyManagerUtilTestCase(BaseLeapTest):

    def setUp(self):
        pass

    def tearDown(self):
        pass

    def test_is_address(self):
        self.assertTrue(
            is_address('user@leap.se'),
            'Incorrect address detection.')
        self.assertFalse(
            is_address('userleap.se'),
            'Incorrect address detection.')
        self.assertFalse(
            is_address('user@'),
            'Incorrect address detection.')
        self.assertFalse(
            is_address('@leap.se'),
            'Incorrect address detection.')

    def test_build_key_from_dict(self):
        kdict = {
            'address': ADDRESS,
            'key_id': 'key_id',
            'fingerprint': 'fingerprint',
            'key_data': 'key_data',
            'private': 'private',
            'length': 'length',
            'expiry_date': 'expiry_date',
            'first_seen_at': 'first_seen_at',
            'last_audited_at': 'last_audited_at',
            'validation': 'validation',
        }
        key = build_key_from_dict(OpenPGPKey, ADDRESS, kdict)
        self.assertEqual(
            kdict['address'], key.address,
            'Wrong data in key.')
        self.assertEqual(
            kdict['key_id'], key.key_id,
            'Wrong data in key.')
        self.assertEqual(
            kdict['fingerprint'], key.fingerprint,
            'Wrong data in key.')
        self.assertEqual(
            kdict['key_data'], key.key_data,
            'Wrong data in key.')
        self.assertEqual(
            kdict['private'], key.private,
            'Wrong data in key.')
        self.assertEqual(
            kdict['length'], key.length,
            'Wrong data in key.')
        self.assertEqual(
            kdict['expiry_date'], key.expiry_date,
            'Wrong data in key.')
        self.assertEqual(
            kdict['first_seen_at'], key.first_seen_at,
            'Wrong data in key.')
        self.assertEqual(
            kdict['last_audited_at'], key.last_audited_at,
            'Wrong data in key.')
        self.assertEqual(
            kdict['validation'], key.validation,
            'Wrong data in key.')

    def test_keymanager_doc_id(self):
        doc_id1 = keymanager_doc_id(
            OpenPGPKey, ADDRESS, private=False)
        doc_id2 = keymanager_doc_id(
            OpenPGPKey, ADDRESS, private=True)
        doc_id3 = keymanager_doc_id(
            OpenPGPKey, 'user@leap.se', private=False)
        doc_id4 = keymanager_doc_id(
            OpenPGPKey, 'user@leap.se', private=True)
        self.assertFalse(doc_id1 == doc_id2, 'Doc ids are equal!')
        self.assertFalse(doc_id1 == doc_id3, 'Doc ids are equal!')
        self.assertFalse(doc_id1 == doc_id4, 'Doc ids are equal!')
        self.assertFalse(doc_id2 == doc_id3, 'Doc ids are equal!')
        self.assertFalse(doc_id2 == doc_id4, 'Doc ids are equal!')
        self.assertFalse(doc_id3 == doc_id4, 'Doc ids are equal!')


class KeyManagerWithSoledadTestCase(BaseLeapTest):

    def setUp(self):
        # mock key fetching and storing so Soledad doesn't fail when trying to
        # reach the server.
        Soledad._fetch_keys_from_shared_db = Mock(return_value=None)
        Soledad._assert_keys_in_shared_db = Mock(return_value=None)

        self._soledad = Soledad(
            "leap@leap.se",
            "123456",
            secret_path=self.tempdir+"/secret.gpg",
            local_db_path=self.tempdir+"/soledad.u1db",
            server_url='',
            cert_file=None,
        )

    def tearDown(self):
        km = self._key_manager()
        for key in km.get_all_keys_in_local_db():
            km._wrapper_map[key.__class__].delete_key(key)
        for key in km.get_all_keys_in_local_db(private=True):
            km._wrapper_map[key.__class__].delete_key(key)

    def _key_manager(self, user=ADDRESS, url=''):
        return KeyManager(user, url, self._soledad)


class OpenPGPCryptoTestCase(KeyManagerWithSoledadTestCase):

    def _test_openpgp_gen_key(self):
        pgp = openpgp.OpenPGPScheme(self._soledad)
        self.assertRaises(KeyNotFound, pgp.get_key, 'user@leap.se')
        key = pgp.gen_key('user@leap.se')
        self.assertIsInstance(key, openpgp.OpenPGPKey)
        self.assertEqual(
            'user@leap.se', key.address, 'Wrong address bound to key.')
        self.assertEqual(
            '4096', key.length, 'Wrong key length.')

    def test_openpgp_put_delete_key(self):
        pgp = openpgp.OpenPGPScheme(self._soledad)
        self.assertRaises(KeyNotFound, pgp.get_key, ADDRESS)
        pgp.put_ascii_key(PUBLIC_KEY)
        key = pgp.get_key(ADDRESS, private=False)
        pgp.delete_key(key)
        self.assertRaises(KeyNotFound, pgp.get_key, ADDRESS)

    def test_openpgp_put_ascii_key(self):
        pgp = openpgp.OpenPGPScheme(self._soledad)
        self.assertRaises(KeyNotFound, pgp.get_key, ADDRESS)
        pgp.put_ascii_key(PUBLIC_KEY)
        key = pgp.get_key(ADDRESS, private=False)
        self.assertIsInstance(key, openpgp.OpenPGPKey)
        self.assertEqual(
            ADDRESS, key.address, 'Wrong address bound to key.')
        self.assertEqual(
            '4096', key.length, 'Wrong key length.')
        pgp.delete_key(key)
        self.assertRaises(KeyNotFound, pgp.get_key, ADDRESS)

    def test_get_public_key(self):
        pgp = openpgp.OpenPGPScheme(self._soledad)
        self.assertRaises(KeyNotFound, pgp.get_key, ADDRESS)
        pgp.put_ascii_key(PUBLIC_KEY)
        self.assertRaises(
            KeyNotFound, pgp.get_key, ADDRESS, private=True)
        key = pgp.get_key(ADDRESS, private=False)
        self.assertEqual(ADDRESS, key.address)
        self.assertFalse(key.private)
        self.assertEqual(KEY_FINGERPRINT, key.fingerprint)
        pgp.delete_key(key)
        self.assertRaises(KeyNotFound, pgp.get_key, ADDRESS)

    def test_openpgp_encrypt_decrypt_asym(self):
        # encrypt
        pgp = openpgp.OpenPGPScheme(self._soledad)
        pgp.put_ascii_key(PUBLIC_KEY)
        pubkey = pgp.get_key(ADDRESS, private=False)
        cyphertext = openpgp.encrypt_asym('data', pubkey)
        # assert
        self.assertTrue(cyphertext is not None)
        self.assertTrue(cyphertext != '')
        self.assertTrue(cyphertext != 'data')
        self.assertTrue(openpgp.is_encrypted_asym(cyphertext))
        self.assertFalse(openpgp.is_encrypted_sym(cyphertext))
        self.assertTrue(openpgp.is_encrypted(cyphertext))
        # decrypt
        self.assertRaises(
            KeyNotFound, pgp.get_key, ADDRESS, private=True)
        pgp.put_ascii_key(PRIVATE_KEY)
        privkey = pgp.get_key(ADDRESS, private=True)
        plaintext = openpgp.decrypt_asym(cyphertext, privkey)
        pgp.delete_key(pubkey)
        pgp.delete_key(privkey)
        self.assertRaises(
            KeyNotFound, pgp.get_key, ADDRESS, private=False)
        self.assertRaises(
            KeyNotFound, pgp.get_key, ADDRESS, private=True)

    def test_openpgp_encrypt_decrypt_sym(self):
        cyphertext = openpgp.encrypt_sym('data', 'pass')
        self.assertTrue(cyphertext is not None)
        self.assertTrue(cyphertext != '')
        self.assertTrue(cyphertext != 'data')
        self.assertTrue(openpgp.is_encrypted_sym(cyphertext))
        self.assertFalse(openpgp.is_encrypted_asym(cyphertext))
        self.assertTrue(openpgp.is_encrypted(cyphertext))
        plaintext = openpgp.decrypt_sym(cyphertext, 'pass')
        self.assertEqual('data', plaintext)

    def test_verify_with_private_raises(self):
        pgp = openpgp.OpenPGPScheme(self._soledad)
        pgp.put_ascii_key(PRIVATE_KEY)
        data = 'data'
        privkey = pgp.get_key(ADDRESS, private=True)
        signed = openpgp.sign(data, privkey)
        self.assertRaises(
            AssertionError,
            openpgp.verify, signed, privkey)

    def test_sign_with_public_raises(self):
        pgp = openpgp.OpenPGPScheme(self._soledad)
        pgp.put_ascii_key(PUBLIC_KEY)
        data = 'data'
        pubkey = pgp.get_key(ADDRESS, private=False)
        self.assertRaises(
            AssertionError,
            openpgp.sign, data, pubkey)

    def test_verify_with_wrong_key_raises(self):
        pgp = openpgp.OpenPGPScheme(self._soledad)
        pgp.put_ascii_key(PRIVATE_KEY)
        data = 'data'
        privkey = pgp.get_key(ADDRESS, private=True)
        signed = openpgp.sign(data, privkey)
        pgp.put_ascii_key(PUBLIC_KEY_2)
        wrongkey = pgp.get_key(ADDRESS_2)
        self.assertRaises(
            errors.InvalidSignature,
            openpgp.verify, signed, wrongkey)

    def test_encrypt_asym_sign_with_public_raises(self):
        pgp = openpgp.OpenPGPScheme(self._soledad)
        pgp.put_ascii_key(PRIVATE_KEY)
        data = 'data'
        privkey = pgp.get_key(ADDRESS, private=True)
        pubkey = pgp.get_key(ADDRESS, private=False)
        self.assertRaises(
            AssertionError,
            openpgp.encrypt_asym, data, privkey, sign=pubkey)

    def test_encrypt_sym_sign_with_public_raises(self):
        pgp = openpgp.OpenPGPScheme(self._soledad)
        pgp.put_ascii_key(PUBLIC_KEY)
        data = 'data'
        pubkey = pgp.get_key(ADDRESS, private=False)
        self.assertRaises(
            AssertionError,
            openpgp.encrypt_sym, data, '123', sign=pubkey)

    def test_decrypt_asym_verify_with_private_raises(self):
        pgp = openpgp.OpenPGPScheme(self._soledad)
        pgp.put_ascii_key(PRIVATE_KEY)
        data = 'data'
        privkey = pgp.get_key(ADDRESS, private=True)
        pubkey = pgp.get_key(ADDRESS, private=False)
        encrypted_and_signed = openpgp.encrypt_asym(
            data, pubkey, sign=privkey)
        self.assertRaises(
            AssertionError,
            openpgp.decrypt_asym,
            encrypted_and_signed, privkey, verify=privkey)

    def test_decrypt_asym_verify_with_wrong_key_raises(self):
        pgp = openpgp.OpenPGPScheme(self._soledad)
        pgp.put_ascii_key(PRIVATE_KEY)
        data = 'data'
        privkey = pgp.get_key(ADDRESS, private=True)
        pubkey = pgp.get_key(ADDRESS, private=False)
        encrypted_and_signed = openpgp.encrypt_asym(data, pubkey, sign=privkey)
        pgp.put_ascii_key(PUBLIC_KEY_2)
        wrongkey = pgp.get_key('anotheruser@leap.se')
        self.assertRaises(
            errors.InvalidSignature,
            openpgp.verify, encrypted_and_signed, wrongkey)

    def test_decrypt_sym_verify_with_private_raises(self):
        pgp = openpgp.OpenPGPScheme(self._soledad)
        pgp.put_ascii_key(PRIVATE_KEY)
        data = 'data'
        privkey = pgp.get_key(ADDRESS, private=True)
        encrypted_and_signed = openpgp.encrypt_sym(data, '123', sign=privkey)
        self.assertRaises(
            AssertionError,
            openpgp.decrypt_sym,
            encrypted_and_signed, 'decrypt', verify=privkey)

    def test_decrypt_sym_verify_with_private_raises(self):
        pgp = openpgp.OpenPGPScheme(self._soledad)
        pgp.put_ascii_key(PRIVATE_KEY)
        data = 'data'
        privkey = pgp.get_key(ADDRESS, private=True)
        encrypted_and_signed = openpgp.encrypt_sym(data, '123', sign=privkey)
        pgp.put_ascii_key(PUBLIC_KEY_2)
        wrongkey = pgp.get_key('anotheruser@leap.se')
        self.assertRaises(
            errors.InvalidSignature,
            openpgp.verify, encrypted_and_signed, wrongkey)

    def test_sign_verify(self):
        pgp = openpgp.OpenPGPScheme(self._soledad)
        pgp.put_ascii_key(PRIVATE_KEY)
        data = 'data'
        privkey = pgp.get_key(ADDRESS, private=True)
        signed = openpgp.sign(data, privkey)
        pubkey = pgp.get_key(ADDRESS, private=False)
        self.assertTrue(openpgp.verify(signed, pubkey))

    def test_encrypt_asym_sign_decrypt_verify(self):
        pgp = openpgp.OpenPGPScheme(self._soledad)
        pgp.put_ascii_key(PRIVATE_KEY)
        pubkey = pgp.get_key(ADDRESS, private=False)
        privkey = pgp.get_key(ADDRESS, private=True)
        pgp.put_ascii_key(PRIVATE_KEY_2)
        pubkey2 = pgp.get_key(ADDRESS_2, private=False)
        privkey2 = pgp.get_key(ADDRESS_2, private=True)
        data = 'data'
        encrypted_and_signed = openpgp.encrypt_asym(data, pubkey2, sign=privkey)
        res = openpgp.decrypt_asym(
                encrypted_and_signed, privkey2, verify=pubkey)
        self.assertTrue(data, res)

    def test_encrypt_sym_sign_decrypt_verify(self):
        pgp = openpgp.OpenPGPScheme(self._soledad)
        pgp.put_ascii_key(PRIVATE_KEY)
        data = 'data'
        privkey = pgp.get_key(ADDRESS, private=True)
        pubkey = pgp.get_key(ADDRESS, private=False)
        encrypted_and_signed = openpgp.encrypt_sym(data, '123', sign=privkey)
        res = openpgp.decrypt_sym(
                encrypted_and_signed, '123', verify=pubkey)
        self.assertEqual(data, res)


class KeyManagerKeyManagementTestCase(
    KeyManagerWithSoledadTestCase):

    def test_get_all_keys_in_db(self):
        km = self._key_manager()
        km._wrapper_map[OpenPGPKey].put_ascii_key(PRIVATE_KEY)
        # get public keys
        keys = km.get_all_keys_in_local_db(False)
        self.assertEqual(len(keys), 1, 'Wrong number of keys')
        self.assertEqual(ADDRESS, keys[0].address)
        self.assertFalse(keys[0].private)
        # get private keys
        keys = km.get_all_keys_in_local_db(True)
        self.assertEqual(len(keys), 1, 'Wrong number of keys')
        self.assertEqual(ADDRESS, keys[0].address)
        self.assertTrue(keys[0].private)

    def test_get_public_key(self):
        km = self._key_manager()
        km._wrapper_map[OpenPGPKey].put_ascii_key(PRIVATE_KEY)
        # get the key
        key = km.get_key(ADDRESS, OpenPGPKey, private=False,
                         fetch_remote=False)
        self.assertTrue(key is not None)
        self.assertEqual(key.address, ADDRESS)
        self.assertEqual(
            key.fingerprint.lower(),  KEY_FINGERPRINT.lower())
        self.assertFalse(key.private)

    def test_get_private_key(self):
        km = self._key_manager()
        km._wrapper_map[OpenPGPKey].put_ascii_key(PRIVATE_KEY)
        # get the key
        key = km.get_key(ADDRESS, OpenPGPKey, private=True,
                         fetch_remote=False)
        self.assertTrue(key is not None)
        self.assertEqual(key.address, ADDRESS)
        self.assertEqual(
            key.fingerprint.lower(), KEY_FINGERPRINT.lower())
        self.assertTrue(key.private)

    def test_send_key_raises_key_not_found(self):
        km = self._key_manager()
        self.assertRaises(
            KeyNotFound,
            km.send_key, OpenPGPKey, send_private=False)

    def test_send_private_key_raises_key_not_found(self):
        km = self._key_manager()
        km._wrapper_map[OpenPGPKey].put_ascii_key(PUBLIC_KEY)
        self.assertRaises(
            KeyNotFound,
            km.send_key, OpenPGPKey, send_private=True,
            password='123')

    def test_send_private_key_without_password_raises(self):
        km = self._key_manager()
        km._wrapper_map[OpenPGPKey].put_ascii_key(PUBLIC_KEY)
        self.assertRaises(
            NoPasswordGiven,
            km.send_key, OpenPGPKey, send_private=True)

    def test_send_public_key(self):
        km = self._key_manager()
        km._wrapper_map[OpenPGPKey].put_ascii_key(PUBLIC_KEY)
        km._fetcher.put = Mock()
        km.token = '123'
        km.send_key(OpenPGPKey, send_private=False)
        # setup args
        data = {
            'address': km._address,
            'keys': [
                json.loads(
                    km.get_key(
                        km._address, OpenPGPKey).get_json()),
            ]
        }
        url = km._nickserver_url + '/key/' + km._address

        km._fetcher.put.assert_called_once_with(
            url, data=data, auth=(km._address, '123')
        )

    def test_fetch_keys_from_server(self):
        km = self._key_manager()
        # setup mock

        class Response(object):
            status_code = 200
            headers = {'content-type': 'application/json'}
            def json(self):
                return {'address': 'anotheruser@leap.se', 'keys': []}

        km._fetcher.get = Mock(
            return_value=Response())
        # do the fetch
        km.fetch_keys_from_server('anotheruser@leap.se')
        # and verify the call
        km._fetcher.get.assert_called_once_with(
           km._nickserver_url + '/key/' + 'anotheruser@leap.se',
        )

    def test_refresh_keys(self):
        # TODO: maybe we should not attempt to refresh our own public key?
        km = self._key_manager()
        km._wrapper_map[OpenPGPKey].put_ascii_key(PUBLIC_KEY)
        km.fetch_keys_from_server = Mock(return_value=[])
        km.refresh_keys()
        km.fetch_keys_from_server.assert_called_once_with(
            'leap@leap.se'
        )


# Key material for testing
KEY_FINGERPRINT = "E36E738D69173C13D709E44F2F455E2824D18DDF"
PUBLIC_KEY = """
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.10 (GNU/Linux)

mQINBFC9+dkBEADNRfwV23TWEoGc/x0wWH1P7PlXt8MnC2Z1kKaKKmfnglVrpOiz
iLWoiU58sfZ0L5vHkzXHXCBf6Eiy/EtUIvdiWAn+yASJ1mk5jZTBKO/WMAHD8wTO
zpMsFmWyg3xc4DkmFa9KQ5EVU0o/nqPeyQxNMQN7px5pPwrJtJFmPxnxm+aDkPYx
irDmz/4DeDNqXliazGJKw7efqBdlwTHkl9Akw2gwy178pmsKwHHEMOBOFFvX61AT
huKqHYmlCGSliwbrJppTG7jc1/ls3itrK+CWTg4txREkSpEVmfcASvw/ZqLbjgfs
d/INMwXnR9U81O8+7LT6yw/ca4ppcFoJD7/XJbkRiML6+bJ4Dakiy6i727BzV17g
wI1zqNvm5rAhtALKfACha6YO43aJzairO4II1wxVHvRDHZn2IuKDDephQ3Ii7/vb
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=MuOY
-----END PGP PUBLIC KEY BLOCK-----
"""
PRIVATE_KEY = """
-----BEGIN PGP PRIVATE KEY BLOCK-----
Version: GnuPG v1.4.10 (GNU/Linux)

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=JTFu
-----END PGP PRIVATE KEY BLOCK-----
"""

PUBLIC_KEY_2 = """
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.10 (GNU/Linux)

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=Thdu
-----END PGP PUBLIC KEY BLOCK-----
"""

PRIVATE_KEY_2 = """
-----BEGIN PGP PRIVATE KEY BLOCK-----
Version: GnuPG v1.4.10 (GNU/Linux)

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=a5gs
-----END PGP PRIVATE KEY BLOCK-----
"""