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221 lines
8.0 KiB
221 lines
8.0 KiB
# This file is dual licensed under the terms of the Apache License, Version
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# 2.0, and the BSD License. See the LICENSE file in the root of this repository
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# for complete details.
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from __future__ import absolute_import, division, print_function
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import base64
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import calendar
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import datetime
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import json
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import os
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import time
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import iso8601
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import pytest
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import six
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from cryptography.fernet import Fernet, InvalidToken, MultiFernet
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from cryptography.hazmat.backends import default_backend
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from cryptography.hazmat.backends.interfaces import CipherBackend, HMACBackend
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from cryptography.hazmat.primitives.ciphers import algorithms, modes
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import cryptography_vectors
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def json_parametrize(keys, filename):
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vector_file = cryptography_vectors.open_vector_file(
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os.path.join('fernet', filename), "r"
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)
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with vector_file:
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data = json.load(vector_file)
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return pytest.mark.parametrize(keys, [
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tuple([entry[k] for k in keys])
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for entry in data
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])
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def test_default_backend():
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f = Fernet(Fernet.generate_key())
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assert f._backend is default_backend()
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@pytest.mark.requires_backend_interface(interface=CipherBackend)
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@pytest.mark.requires_backend_interface(interface=HMACBackend)
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@pytest.mark.supported(
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only_if=lambda backend: backend.cipher_supported(
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algorithms.AES(b"\x00" * 32), modes.CBC(b"\x00" * 16)
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),
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skip_message="Does not support AES CBC",
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)
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class TestFernet(object):
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@json_parametrize(
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("secret", "now", "iv", "src", "token"), "generate.json",
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)
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def test_generate(self, secret, now, iv, src, token, backend):
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f = Fernet(secret.encode("ascii"), backend=backend)
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actual_token = f._encrypt_from_parts(
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src.encode("ascii"),
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calendar.timegm(iso8601.parse_date(now).utctimetuple()),
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b"".join(map(six.int2byte, iv))
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)
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assert actual_token == token.encode("ascii")
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@json_parametrize(
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("secret", "now", "src", "ttl_sec", "token"), "verify.json",
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)
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def test_verify(self, secret, now, src, ttl_sec, token, backend,
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monkeypatch):
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f = Fernet(secret.encode("ascii"), backend=backend)
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current_time = calendar.timegm(iso8601.parse_date(now).utctimetuple())
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monkeypatch.setattr(time, "time", lambda: current_time)
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payload = f.decrypt(token.encode("ascii"), ttl=ttl_sec)
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assert payload == src.encode("ascii")
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@json_parametrize(("secret", "token", "now", "ttl_sec"), "invalid.json")
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def test_invalid(self, secret, token, now, ttl_sec, backend, monkeypatch):
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f = Fernet(secret.encode("ascii"), backend=backend)
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current_time = calendar.timegm(iso8601.parse_date(now).utctimetuple())
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monkeypatch.setattr(time, "time", lambda: current_time)
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with pytest.raises(InvalidToken):
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f.decrypt(token.encode("ascii"), ttl=ttl_sec)
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def test_invalid_start_byte(self, backend):
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f = Fernet(base64.urlsafe_b64encode(b"\x00" * 32), backend=backend)
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with pytest.raises(InvalidToken):
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f.decrypt(base64.urlsafe_b64encode(b"\x81"))
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def test_timestamp_too_short(self, backend):
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f = Fernet(base64.urlsafe_b64encode(b"\x00" * 32), backend=backend)
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with pytest.raises(InvalidToken):
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f.decrypt(base64.urlsafe_b64encode(b"\x80abc"))
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def test_non_base64_token(self, backend):
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f = Fernet(base64.urlsafe_b64encode(b"\x00" * 32), backend=backend)
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with pytest.raises(InvalidToken):
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f.decrypt(b"\x00")
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def test_unicode(self, backend):
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f = Fernet(base64.urlsafe_b64encode(b"\x00" * 32), backend=backend)
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with pytest.raises(TypeError):
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f.encrypt(u"")
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with pytest.raises(TypeError):
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f.decrypt(u"")
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def test_timestamp_ignored_no_ttl(self, monkeypatch, backend):
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f = Fernet(base64.urlsafe_b64encode(b"\x00" * 32), backend=backend)
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pt = b"encrypt me"
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token = f.encrypt(pt)
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ts = "1985-10-26T01:20:01-07:00"
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current_time = calendar.timegm(iso8601.parse_date(ts).utctimetuple())
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monkeypatch.setattr(time, "time", lambda: current_time)
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assert f.decrypt(token, ttl=None) == pt
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@pytest.mark.parametrize("message", [b"", b"Abc!", b"\x00\xFF\x00\x80"])
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def test_roundtrips(self, message, backend):
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f = Fernet(Fernet.generate_key(), backend=backend)
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assert f.decrypt(f.encrypt(message)) == message
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def test_bad_key(self, backend):
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with pytest.raises(ValueError):
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Fernet(base64.urlsafe_b64encode(b"abc"), backend=backend)
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def test_extract_timestamp(self, monkeypatch, backend):
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f = Fernet(base64.urlsafe_b64encode(b"\x00" * 32), backend=backend)
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current_time = 1526138327
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monkeypatch.setattr(time, "time", lambda: current_time)
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token = f.encrypt(b'encrypt me')
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assert f.extract_timestamp(token) == current_time
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with pytest.raises(InvalidToken):
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f.extract_timestamp(b"nonsensetoken")
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@pytest.mark.requires_backend_interface(interface=CipherBackend)
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@pytest.mark.requires_backend_interface(interface=HMACBackend)
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@pytest.mark.supported(
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only_if=lambda backend: backend.cipher_supported(
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algorithms.AES(b"\x00" * 32), modes.CBC(b"\x00" * 16)
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),
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skip_message="Does not support AES CBC",
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)
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class TestMultiFernet(object):
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def test_encrypt(self, backend):
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f1 = Fernet(base64.urlsafe_b64encode(b"\x00" * 32), backend=backend)
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f2 = Fernet(base64.urlsafe_b64encode(b"\x01" * 32), backend=backend)
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f = MultiFernet([f1, f2])
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assert f1.decrypt(f.encrypt(b"abc")) == b"abc"
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def test_decrypt(self, backend):
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f1 = Fernet(base64.urlsafe_b64encode(b"\x00" * 32), backend=backend)
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f2 = Fernet(base64.urlsafe_b64encode(b"\x01" * 32), backend=backend)
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f = MultiFernet([f1, f2])
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assert f.decrypt(f1.encrypt(b"abc")) == b"abc"
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assert f.decrypt(f2.encrypt(b"abc")) == b"abc"
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with pytest.raises(InvalidToken):
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f.decrypt(b"\x00" * 16)
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def test_no_fernets(self, backend):
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with pytest.raises(ValueError):
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MultiFernet([])
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def test_non_iterable_argument(self, backend):
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with pytest.raises(TypeError):
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MultiFernet(None)
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def test_rotate(self, backend):
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f1 = Fernet(base64.urlsafe_b64encode(b"\x00" * 32), backend=backend)
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f2 = Fernet(base64.urlsafe_b64encode(b"\x01" * 32), backend=backend)
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mf1 = MultiFernet([f1])
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mf2 = MultiFernet([f2, f1])
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plaintext = b"abc"
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mf1_ciphertext = mf1.encrypt(plaintext)
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assert mf2.decrypt(mf1_ciphertext) == plaintext
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rotated = mf2.rotate(mf1_ciphertext)
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assert rotated != mf1_ciphertext
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assert mf2.decrypt(rotated) == plaintext
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with pytest.raises(InvalidToken):
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mf1.decrypt(rotated)
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def test_rotate_preserves_timestamp(self, backend, monkeypatch):
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f1 = Fernet(base64.urlsafe_b64encode(b"\x00" * 32), backend=backend)
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f2 = Fernet(base64.urlsafe_b64encode(b"\x01" * 32), backend=backend)
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mf1 = MultiFernet([f1])
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mf2 = MultiFernet([f2, f1])
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plaintext = b"abc"
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mf1_ciphertext = mf1.encrypt(plaintext)
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later = datetime.datetime.now() + datetime.timedelta(minutes=5)
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later_time = time.mktime(later.timetuple())
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monkeypatch.setattr(time, "time", lambda: later_time)
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original_time, _ = Fernet._get_unverified_token_data(mf1_ciphertext)
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rotated_time, _ = Fernet._get_unverified_token_data(
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mf2.rotate(mf1_ciphertext)
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)
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assert later_time != rotated_time
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assert original_time == rotated_time
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def test_rotate_decrypt_no_shared_keys(self, backend):
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f1 = Fernet(base64.urlsafe_b64encode(b"\x00" * 32), backend=backend)
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f2 = Fernet(base64.urlsafe_b64encode(b"\x01" * 32), backend=backend)
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mf1 = MultiFernet([f1])
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mf2 = MultiFernet([f2])
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with pytest.raises(InvalidToken):
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mf2.rotate(mf1.encrypt(b"abc"))
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