From afa7e3fb8266fb6af7c36d46eb8ee20e844d8107 Mon Sep 17 00:00:00 2001 From: Brad Warren Date: Thu, 7 Jun 2018 14:45:23 -0700 Subject: [PATCH] Unrevert #6000 and silence deprecation warnings (#6082) * Revert "Revert "switch signature verification to use pure cryptography (#6000)" (#6074)" This reverts commit 3cffe1449c4e9166b65eaed75022d73b7ad79328. * Fixes #6073. This silences the deprecation warnings from cryptography. I looked into only silencing the cryptography warning specifically in the function, however, CryptographyDeprecationWarning doesn't seem to be publicly documented, so we probably shouldn't depend on it. --- certbot/crypto_util.py | 40 ++++++++++++++----- certbot/tests/crypto_util_test.py | 10 +++++ .../tests/testdata/cert-nosans_nistp256.pem | 11 +++++ .../tests/testdata/csr-nosans_nistp256.pem | 8 ++++ certbot/tests/testdata/nistp256_key.pem | 5 +++ 5 files changed, 64 insertions(+), 10 deletions(-) create mode 100644 certbot/tests/testdata/cert-nosans_nistp256.pem create mode 100644 certbot/tests/testdata/csr-nosans_nistp256.pem create mode 100644 certbot/tests/testdata/nistp256_key.pem diff --git a/certbot/crypto_util.py b/certbot/crypto_util.py index b5ad16db1..943e2c87f 100644 --- a/certbot/crypto_util.py +++ b/certbot/crypto_util.py @@ -7,16 +7,21 @@ import hashlib import logging import os - +import warnings import pyrfc3339 import six import zope.component +from cryptography.exceptions import InvalidSignature +from cryptography.hazmat.backends import default_backend +from cryptography.hazmat.primitives.asymmetric.ec import ECDSA +from cryptography.hazmat.primitives.asymmetric.ec import EllipticCurvePublicKey +from cryptography.hazmat.primitives.asymmetric.padding import PKCS1v15 +from cryptography.hazmat.primitives.asymmetric.rsa import RSAPublicKey +# https://github.com/python/typeshed/tree/master/third_party/2/cryptography +from cryptography import x509 # type: ignore from OpenSSL import crypto from OpenSSL import SSL # type: ignore -from cryptography.hazmat.backends import default_backend -# https://github.com/python/typeshed/tree/master/third_party/2/cryptography -from cryptography import x509 # type: ignore from acme import crypto_util as acme_crypto_util from acme.magic_typing import IO # pylint: disable=unused-import, no-name-in-module @@ -228,13 +233,28 @@ def verify_renewable_cert_sig(renewable_cert): """ try: with open(renewable_cert.chain, 'rb') as chain_file: # type: IO[bytes] - chain, _ = pyopenssl_load_certificate(chain_file.read()) + chain = x509.load_pem_x509_certificate(chain_file.read(), default_backend()) with open(renewable_cert.cert, 'rb') as cert_file: # type: IO[bytes] - cert = x509.load_pem_x509_certificate( - cert_file.read(), default_backend()) - hash_name = cert.signature_hash_algorithm.name - crypto.verify(chain, cert.signature, cert.tbs_certificate_bytes, hash_name) - except (IOError, ValueError, crypto.Error) as e: + cert = x509.load_pem_x509_certificate(cert_file.read(), default_backend()) + pk = chain.public_key() + with warnings.catch_warnings(): + warnings.simplefilter("ignore") + if isinstance(pk, RSAPublicKey): + # https://github.com/python/typeshed/blob/master/third_party/2/cryptography/hazmat/primitives/asymmetric/rsa.pyi + verifier = pk.verifier( # type: ignore + cert.signature, PKCS1v15(), cert.signature_hash_algorithm + ) + verifier.update(cert.tbs_certificate_bytes) + verifier.verify() + elif isinstance(pk, EllipticCurvePublicKey): + verifier = pk.verifier( + cert.signature, ECDSA(cert.signature_hash_algorithm) + ) + verifier.update(cert.tbs_certificate_bytes) + verifier.verify() + else: + raise errors.Error("Unsupported public key type") + except (IOError, ValueError, InvalidSignature) as e: error_str = "verifying the signature of the cert located at {0} has failed. \ Details: {1}".format(renewable_cert.cert, e) logger.exception(error_str) diff --git a/certbot/tests/crypto_util_test.py b/certbot/tests/crypto_util_test.py index 2fe0e3d30..baf14b2ef 100644 --- a/certbot/tests/crypto_util_test.py +++ b/certbot/tests/crypto_util_test.py @@ -21,6 +21,9 @@ CERT_PATH = test_util.vector_path('cert_512.pem') CERT = test_util.load_vector('cert_512.pem') SS_CERT_PATH = test_util.vector_path('cert_2048.pem') SS_CERT = test_util.load_vector('cert_2048.pem') +P256_KEY = test_util.load_vector('nistp256_key.pem') +P256_CERT_PATH = test_util.vector_path('cert-nosans_nistp256.pem') +P256_CERT = test_util.load_vector('cert-nosans_nistp256.pem') class InitSaveKeyTest(test_util.TempDirTestCase): """Tests for certbot.crypto_util.init_save_key.""" @@ -217,6 +220,13 @@ class VerifyRenewableCertSigTest(VerifyCertSetup): def test_cert_sig_match(self): self.assertEqual(None, self._call(self.renewable_cert)) + def test_cert_sig_match_ec(self): + renewable_cert = mock.MagicMock() + renewable_cert.cert = P256_CERT_PATH + renewable_cert.chain = P256_CERT_PATH + renewable_cert.privkey = P256_KEY + self.assertEqual(None, self._call(renewable_cert)) + def test_cert_sig_mismatch(self): self.bad_renewable_cert.cert = test_util.vector_path('cert_512_bad.pem') self.assertRaises(errors.Error, self._call, self.bad_renewable_cert) diff --git a/certbot/tests/testdata/cert-nosans_nistp256.pem b/certbot/tests/testdata/cert-nosans_nistp256.pem new file mode 100644 index 000000000..4ec3f24ce --- /dev/null +++ b/certbot/tests/testdata/cert-nosans_nistp256.pem @@ -0,0 +1,11 @@ +-----BEGIN CERTIFICATE----- +MIIBoDCCAUYCCQDCnzfUZ7TQdDAKBggqhkjOPQQDAjBYMQswCQYDVQQGEwJVUzER +MA8GA1UECAwITWljaGlnYW4xEjAQBgNVBAcMCUFubiBBcmJvcjEMMAoGA1UECgwD +RUZGMRQwEgYDVQQDDAtleGFtcGxlLmNvbTAeFw0xODA1MTUxNzIyMzlaFw0xODA2 +MTQxNzIyMzlaMFgxCzAJBgNVBAYTAlVTMREwDwYDVQQIDAhNaWNoaWdhbjESMBAG +A1UEBwwJQW5uIEFyYm9yMQwwCgYDVQQKDANFRkYxFDASBgNVBAMMC2V4YW1wbGUu +Y29tMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEPPl0JauSZukvAUWv4l5VNLAY +QXhuPXYQBf4dVET3s0E5q9ZCbSe+pNUbko9F+TFkuc7XVjQPsfkDbh0I9nD0tzAK +BggqhkjOPQQDAgNIADBFAiEAv8S2GXmWJqZ+j3DBfm72E1YK+HkOf+TOUHsbVR+O +Z1oCIFWNt1SPdIgRp4QAyzVk2pcTF8jDNajEMLWETDtxgRvM +-----END CERTIFICATE----- diff --git a/certbot/tests/testdata/csr-nosans_nistp256.pem b/certbot/tests/testdata/csr-nosans_nistp256.pem new file mode 100644 index 000000000..2f0a671ed --- /dev/null +++ b/certbot/tests/testdata/csr-nosans_nistp256.pem @@ -0,0 +1,8 @@ +-----BEGIN CERTIFICATE REQUEST----- +MIIBFDCBugIBADBYMQswCQYDVQQGEwJVUzERMA8GA1UECAwITWljaGlnYW4xEjAQ +BgNVBAcMCUFubiBBcmJvcjEMMAoGA1UECgwDRUZGMRQwEgYDVQQDDAtleGFtcGxl +LmNvbTBZMBMGByqGSM49AgEGCCqGSM49AwEHA0IABDz5dCWrkmbpLwFFr+JeVTSw +GEF4bj12EAX+HVRE97NBOavWQm0nvqTVG5KPRfkxZLnO11Y0D7H5A24dCPZw9Leg +ADAKBggqhkjOPQQDAgNJADBGAiEAuoZHrYA5sy2DRTdLAxJTBNHKFFKbtaGt+QaJ +A62qa8sCIQCUkSgSAiNaEnJ7r5fKphdjeORHqhpl6flYkLE3lGmGdg== +-----END CERTIFICATE REQUEST----- diff --git a/certbot/tests/testdata/nistp256_key.pem b/certbot/tests/testdata/nistp256_key.pem new file mode 100644 index 000000000..4be37e49b --- /dev/null +++ b/certbot/tests/testdata/nistp256_key.pem @@ -0,0 +1,5 @@ +-----BEGIN EC PRIVATE KEY----- +MHcCAQEEIOvXH384CyNNv2lfxvjc7hg2f7ScYoLvlk/VpINLJlGBoAoGCCqGSM49 +AwEHoUQDQgAEPPl0JauSZukvAUWv4l5VNLAYQXhuPXYQBf4dVET3s0E5q9ZCbSe+ +pNUbko9F+TFkuc7XVjQPsfkDbh0I9nD0tw== +-----END EC PRIVATE KEY-----