pax_global_header00006660000000000000000000000064125666214470014527gustar00rootroot0000000000000052 comment=ae466d95a4c0fafe2c4c867afae82f3a25dcbffe python-signedjson-1.0.0/000077500000000000000000000000001256662144700152075ustar00rootroot00000000000000python-signedjson-1.0.0/.gitignore000066400000000000000000000001221256662144700171720ustar00rootroot00000000000000.coverage .tox/ __pycache__ */__pycache__/ *.egg-info/ *.pyc */*.pyc build/ dist/ python-signedjson-1.0.0/.travis.yml000066400000000000000000000002531256662144700173200ustar00rootroot00000000000000language: python env: - TOXENV=packaging - TOXENV=pep8 - TOXENV=py3pep8 - TOXENV=py27 - TOXENV=py33 - TOXENV=py34 - TOXENV=pypy install: - pip install tox script: - tox python-signedjson-1.0.0/LICENSE000066400000000000000000000236761256662144700162320ustar00rootroot00000000000000 Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. 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END OF TERMS AND CONDITIONS python-signedjson-1.0.0/MANIFEST.in000066400000000000000000000001461256662144700167460ustar00rootroot00000000000000include *.in include *.py include tests/*.py include LICENSE include tox.ini include requirements.txt python-signedjson-1.0.0/README.rst000066400000000000000000000030611256662144700166760ustar00rootroot00000000000000Signed JSON =========== .. image:: https://img.shields.io/pypi/v/signedjson.svg :target: https://pypi.python.org/pypi/signedjson/ :alt: Latest Version .. image:: https://img.shields.io/travis/matrix-org/python-signedjson.svg :target: https://travis-ci.org/matrix-org/python-signedjson Signs JSON objects with ED25519 signatures. Features -------- * More than one entity can sign the same object. * Each entity can sign the object with more than one key making it easier to rotate keys * ED25519 can be replaced with a different algorithm. * Unprotected data can be added to the object under the ``"unsigned"`` key. Installing ---------- .. code:: bash pip install signedjson Using ----- .. code:: python from signedjson.key import generate_signing_key, get_verify_key from signedjson.sign import ( sign_json, verify_signed_json, SignatureVerifyException ) signing_key = generate_signing_key('zxcvb') signed_json = sign_json({'my_key': 'my_data'}, 'Alice', signing_key) verify_key = get_verify_key(signing_key) try: verify_signed_json(signed_json, 'Alice', verify_key) print 'Signature is valid' except SignatureVerifyException: print 'Signature is invalid' Format ------ .. code:: json { "": "", "signatures": { "": { "ed25519:": "" } }, "unsigned": { "": "", } } python-signedjson-1.0.0/requirements.txt000066400000000000000000000000051256662144700204660ustar00rootroot00000000000000-e . python-signedjson-1.0.0/setup.py000077500000000000000000000032231256662144700167240ustar00rootroot00000000000000#!/usr/bin/env python # Copyright 2015 OpenMarket Ltd # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. from setuptools import setup from codecs import open import os here = os.path.abspath(os.path.dirname(__file__)) def read_file(path_segments): """Read a UTF-8 file from the package. Takes a list of strings to join to make the path""" file_path = os.path.join(here, *path_segments) with open(file_path, encoding="utf-8") as f: return f.read() def exec_file(path_segments, name): """Extract a constant from a python file by looking for a line defining the constant and executing it.""" result = {} code = read_file(path_segments) lines = [line for line in code.split('\n') if line.startswith(name)] exec("\n".join(lines), result) return result[name] setup( name="signedjson", version=exec_file(("signedjson", "__init__.py",), "__version__"), packages=["signedjson"], description="Sign JSON with Ed25519 signatures", install_requires=[ "canonicaljson>=1.0.0", "unpaddedbase64>=1.0.1", "pynacl>=0.3.0", ], long_description=read_file(("README.rst",)), keywords="json", ) python-signedjson-1.0.0/signedjson/000077500000000000000000000000001256662144700173525ustar00rootroot00000000000000python-signedjson-1.0.0/signedjson/__init__.py000066400000000000000000000011311256662144700214570ustar00rootroot00000000000000# Copyright 2014 OpenMarket Ltd # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. __version__ = "1.0.0" python-signedjson-1.0.0/signedjson/key.py000066400000000000000000000102611256662144700205140ustar00rootroot00000000000000from unpaddedbase64 import encode_base64, decode_base64 import nacl.signing NACL_ED25519 = "ed25519" SUPPORTED_ALGORITHMS = [NACL_ED25519] def generate_signing_key(version): """Generate a new signing key Args: version (str): Identifies this key out the keys for this entity. Returns: A SigningKey object. """ key = nacl.signing.SigningKey.generate() key.version = version key.alg = NACL_ED25519 return key def get_verify_key(signing_key): """Get a verify key from a signing key""" verify_key = signing_key.verify_key verify_key.version = signing_key.version verify_key.alg = signing_key.alg return verify_key def decode_signing_key_base64(algorithm, version, key_base64): """Decode a base64 encoded signing key Args: algorithm (str): The algorithm the key is for (currently "ed25519"). version (str): Identifies this key out of the keys for this entity. key_base64 (str): Base64 encoded bytes of the key. Returns: A SigningKey object. """ if algorithm == NACL_ED25519: key_bytes = decode_base64(key_base64) key = nacl.signing.SigningKey(key_bytes) key.version = version key.alg = NACL_ED25519 return key else: raise ValueError("Unsupported algorithm %s" % (algorithm,)) def encode_signing_key_base64(key): """Encode a signing key as base64 Args: key (SigningKey): A signing key to encode. Returns: base64 encoded string. """ return encode_base64(key.encode()) def encode_verify_key_base64(key): """Encode a verify key as base64 Args: key (VerifyKey): A signing key to encode. Returns: base64 encoded string. """ return encode_base64(key.encode()) def is_signing_algorithm_supported(key_id): """Is the signing algorithm for this key_id supported""" if key_id.startswith(NACL_ED25519 + ":"): return True else: return False def decode_verify_key_base64(algorithm, version, key_base64): """Decode a base64 encoded verify key Args: algorithm (str): The algorithm the key is for (currently "ed25519"). version (str): Identifies this key out of the keys for this entity. key_base64 (str): Base64 encoded bytes of the key. Returns: A VerifyKey object. """ key_id = "%s:%s" % (algorithm, version) key_bytes = decode_base64(key_base64) return decode_verify_key_bytes(key_id, key_bytes) def decode_verify_key_bytes(key_id, key_bytes): """Decode a base64 encoded verify key Args: key_id (str): Identifies this key out of the keys for this entity. key_base64 (str): Base64 encoded bytes of the key. Returns: A VerifyKey object. """ if key_id.startswith(NACL_ED25519 + ":"): version = key_id[len(NACL_ED25519) + 1:] key = nacl.signing.VerifyKey(key_bytes) key.version = version key.alg = NACL_ED25519 return key else: raise ValueError("Unsupported algorithm %r" % (key_id,)) def read_signing_keys(stream): """Reads a list of keys from a stream Args: stream : A stream to iterate for keys. Returns: list of SigningKey objects. """ keys = [] for line in stream: algorithm, version, key_base64 = line.split() key = decode_signing_key_base64(algorithm, version, key_base64) keys.append(key) return keys def read_old_signing_keys(stream): """Reads a list of old keys from a stream Args: stream : A stream to iterate for keys. Returns: list of VerifyKey objects. """ keys = [] for line in stream: algorithm, version, expired, key_base64 = line.split() key = decode_verify_key_base64(algorithm, version, key_base64) key.expired = int(expired) keys.append(key) return keys def write_signing_keys(stream, keys): """Writes a list of keys to a stream. Args: stream: Stream to write keys to. keys: List of SigningKey objects. """ for key in keys: key_base64 = encode_signing_key_base64(key) stream.write("%s %s %s\n" % (key.alg, key.version, key_base64,)) python-signedjson-1.0.0/signedjson/sign.py000066400000000000000000000100021256662144700206550ustar00rootroot00000000000000# -*- coding: utf-8 -*- # Copyright 2014 OpenMarket Ltd # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. from canonicaljson import encode_canonical_json from unpaddedbase64 import encode_base64, decode_base64 from signedjson.key import SUPPORTED_ALGORITHMS import logging logger = logging.getLogger(__name__) def sign_json(json_object, signature_name, signing_key): """Sign the JSON object. Stores the signature in json_object["signatures"]. Args: json_object (dict): The JSON object to sign. signature_name (str): The name of the signing entity. signing_key (syutil.crypto.SigningKey): The key to sign the JSON with. Returns: The modified, signed JSON object.""" signatures = json_object.pop("signatures", {}) unsigned = json_object.pop("unsigned", None) message_bytes = encode_canonical_json(json_object) signed = signing_key.sign(message_bytes) signature_base64 = encode_base64(signed.signature) key_id = "%s:%s" % (signing_key.alg, signing_key.version) signatures.setdefault(signature_name, {})[key_id] = signature_base64 # logger.debug("SIGNING: %s %s %s", signature_name, key_id, message_bytes) json_object["signatures"] = signatures if unsigned is not None: json_object["unsigned"] = unsigned return json_object def signature_ids(json_object, signature_name, supported_algorithms=SUPPORTED_ALGORITHMS): """Does the JSON object have a signature for the given name? Args: json_object (dict): The JSON object to check. signature_name (str): The name of the signing entity to check for supported_algorithms (list of str): List of supported signature algorithms Returns: list of key identifier strings. """ key_ids = json_object.get("signatures", {}).get(signature_name, {}).keys() return list( key_id for key_id in key_ids if key_id.split(":")[0] in supported_algorithms ) class SignatureVerifyException(Exception): """A signature could not be verified""" pass def verify_signed_json(json_object, signature_name, verify_key): """Check a signature on a signed JSON object. Args: json_object (dict): The signed JSON object to check. signature_name (str): The name of the signature to check. verify_key (syutil.crypto.VerifyKey): The key to verify the signature. Raises: InvalidSignature: If the signature isn't valid """ try: signatures = json_object["signatures"] except KeyError: raise SignatureVerifyException("No signatures on this object") key_id = "%s:%s" % (verify_key.alg, verify_key.version) try: signature_b64 = signatures[signature_name][key_id] except: raise SignatureVerifyException( "Missing signature for %s, %s" % (signature_name, key_id) ) try: signature = decode_base64(signature_b64) except: raise SignatureVerifyException( "Invalid signature base64 for %s, %s" % (signature_name, key_id) ) json_object_copy = dict(json_object) del json_object_copy["signatures"] json_object_copy.pop("unsigned", None) message = encode_canonical_json(json_object_copy) # logger.debug("VERIFY: %s %s %s", signature_name, key_id, message) try: verify_key.verify(message, signature) except: logger.exception("Error verifying signature") raise SignatureVerifyException( "Unable to verify signature for %s " % signature_name ) python-signedjson-1.0.0/tests/000077500000000000000000000000001256662144700163515ustar00rootroot00000000000000python-signedjson-1.0.0/tests/__init__.py000066400000000000000000000011021256662144700204540ustar00rootroot00000000000000# Copyright 2014 OpenMarket Ltd # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. python-signedjson-1.0.0/tests/test_key.py000066400000000000000000000063061256662144700205570ustar00rootroot00000000000000 import unittest from signedjson.key import ( generate_signing_key, get_verify_key, decode_signing_key_base64, encode_signing_key_base64, is_signing_algorithm_supported, encode_verify_key_base64, decode_verify_key_base64, read_signing_keys, read_old_signing_keys, write_signing_keys ) class GenerateTestCase(unittest.TestCase): def test_generate_key(self): my_version = "my_version" my_key = generate_signing_key(my_version) self.assertEquals(my_key.alg, "ed25519") self.assertEquals(my_key.version, my_version) class DecodeTestCase(unittest.TestCase): def setUp(self): self.version = "my_version" self.key = generate_signing_key(self.version) self.key_base64 = encode_signing_key_base64(self.key) self.verify_key = get_verify_key(self.key) self.verify_key_base64 = encode_verify_key_base64(self.verify_key) def test_decode(self): decoded_key = decode_signing_key_base64( "ed25519", self.version, self.key_base64 ) self.assertEquals(decoded_key.alg, "ed25519") self.assertEquals(decoded_key.version, self.version) def test_decode_invalid_base64(self): with self.assertRaises(Exception): decode_signing_key_base64("ed25519", self.version, "not base 64") def test_decode_invalid_algorithm(self): with self.assertRaises(Exception): decode_signing_key_base64("not a valid alg", self.version, "") def test_decode_invalid_key(self): with self.assertRaises(Exception): decode_signing_key_base64("ed25519", self.version, "") def test_decode_verify_key(self): decoded_key = decode_verify_key_base64( "ed25519", self.version, self.verify_key_base64 ) self.assertEquals(decoded_key.alg, "ed25519") self.assertEquals(decoded_key.version, self.version) def test_decode_verify_key_invalid_base64(self): with self.assertRaises(Exception): decode_verify_key_base64("ed25519", self.version, "not base 64") def test_decode_verify_key_invalid_algorithm(self): with self.assertRaises(Exception): decode_verify_key_base64("not a valid alg", self.version, "") def test_decode_verify_key_invalid_key(self): with self.assertRaises(Exception): decode_verify_key_base64("ed25519", self.version, "") def test_read_keys(self): stream = ["ed25519 %s %s" % (self.version, self.key_base64)] keys = read_signing_keys(stream) self.assertEquals(len(keys), 1) def test_read_old_keys(self): stream = ["ed25519 %s 0 %s" % (self.version, self.verify_key_base64)] keys = read_old_signing_keys(stream) self.assertEquals(len(keys), 1) def test_write_signing_keys(self): class MockStream(object): def write(self, data): pass write_signing_keys(MockStream(), [self.key]) class AlgorithmSupportedTestCase(unittest.TestCase): def test_ed25519(self): self.assertTrue(is_signing_algorithm_supported("ed25519:an_id")) def test_unsupported(self): self.assertFalse(is_signing_algorithm_supported("unsupported:")) python-signedjson-1.0.0/tests/test_sign.py000066400000000000000000000057631256662144700207350ustar00rootroot00000000000000# -*- coding: utf-8 -*- # Copyright 2014 OpenMarket Ltd # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. import unittest from unpaddedbase64 import encode_base64 from signedjson.sign import ( sign_json, verify_signed_json, signature_ids, SignatureVerifyException ) class JsonSignTestCase(unittest.TestCase): def setUp(self): self.message = {'foo': 'bar', 'unsigned': {}} self.sigkey = MockSigningKey() self.assertEqual(self.sigkey.alg, 'mock') self.signed = sign_json(self.message, 'Alice', self.sigkey) self.verkey = MockVerifyKey() def test_sign_and_verify(self): self.assertIn('signatures', self.signed) self.assertIn('Alice', self.signed['signatures']) self.assertIn('mock:test', self.signed['signatures']['Alice']) self.assertEqual( self.signed['signatures']['Alice']['mock:test'], encode_base64(b'x_______') ) self.assertEqual(self.sigkey.signed_bytes, b'{"foo":"bar"}') verify_signed_json(self.signed, 'Alice', self.verkey) def test_signature_ids(self): key_ids = signature_ids( self.signed, 'Alice', supported_algorithms=['mock'] ) self.assertListEqual(key_ids, ['mock:test']) def test_verify_fail(self): self.signed['signatures']['Alice']['mock:test'] = encode_base64( b'not a signature' ) with self.assertRaises(SignatureVerifyException): verify_signed_json(self.signed, 'Alice', self.verkey) def test_verify_fail_no_signatures(self): with self.assertRaises(SignatureVerifyException): verify_signed_json({}, 'Alice', self.verkey) def test_verify_fail_no_signature_for_alice(self): with self.assertRaises(SignatureVerifyException): verify_signed_json({'signatures': {}}, 'Alice', self.verkey) def test_verify_fail_not_base64(self): invalid = {'signatures': {'Alice': {'mock:test': 'not base64'}}} with self.assertRaises(SignatureVerifyException): verify_signed_json(invalid, 'Alice', self.verkey) class MockSigningKey(object): alg = "mock" version = "test" def sign(self, signed_bytes): self.signed_bytes = signed_bytes return MockSignature() class MockVerifyKey(object): alg = "mock" version = "test" def verify(self, message, sig): if not sig == b"x_______": raise Exception() class MockSignature(object): def __init__(self): self.signature = b"x_______" python-signedjson-1.0.0/tox.ini000066400000000000000000000007061256662144700165250ustar00rootroot00000000000000[tox] envlist = packaging, pep8, py3pep8, py27, py33, py34, pypy [testenv] deps = coverage nose -rrequirements.txt commands = coverage run --source signedjson -m nose coverage report -m --fail-under 100 [testenv:packaging] deps = check-manifest commands = check-manifest [testenv:pep8] basepython = python2.7 deps = flake8 commands = flake8 . [testenv:py3pep8] basepython = python3.4 deps = flake8 commands = flake8 .