Use cryptography to load PKCS12 certificates

... because implementation in PyOpenSSL has been derprecated, according
to the following warning.

```
DeprecationWarning: PKCS#12 support in pyOpenSSL is deprecated. You
should use the APIs in cryptography.
```

Closes-Bug: #2042787
Change-Id: Ic81e98c54c4bce100e3f44ff1a2fe6ce7b7f4256

Author: kajinamit

octavia/certificates/common/pkcs12.py

@@ -18,7 +18,7 @@
 """
 
 from cryptography.hazmat.primitives import serialization
-from OpenSSL import crypto
+from cryptography.hazmat.primitives.serialization import pkcs12
 
 from octavia.certificates.common import cert
 from octavia.common import exceptions
@@ -28,29 +28,29 @@ class PKCS12Cert(cert.Cert):
     """Representation of a Cert for local storage."""
     def __init__(self, certbag):
         try:
-            p12 = crypto.load_pkcs12(certbag)
-        except crypto.Error as e:
+            p12 = pkcs12.load_pkcs12(certbag, None)
+        except (TypeError, ValueError) as e:
             raise exceptions.UnreadablePKCS12(error=str(e))
-        self.certificate = p12.get_certificate()
-        self.intermediates = p12.get_ca_certificates()
-        self.private_key = p12.get_privatekey()
+        self.certificate = p12.cert
+        self.intermediates = p12.additional_certs
+        self.private_key = p12.key
 
     def get_certificate(self):
-        return self.certificate.to_cryptography().public_bytes(
+        return self.certificate.certificate.public_bytes(
             encoding=serialization.Encoding.PEM).strip()
 
     def get_intermediates(self):
         if self.intermediates:
             int_data = [
-                ic.to_cryptography().public_bytes(
+                ic.certificate.public_bytes(
                     encoding=serialization.Encoding.PEM).strip()
                 for ic in self.intermediates
             ]
             return int_data
         return None
 
     def get_private_key(self):
-        return self.private_key.to_cryptography_key().private_bytes(
+        return self.private_key.private_bytes(
             encoding=serialization.Encoding.PEM,
             format=serialization.PrivateFormat.TraditionalOpenSSL,
             encryption_algorithm=serialization.NoEncryption()).strip()

octavia/certificates/manager/barbican.py

@@ -17,8 +17,9 @@
 """
 Cert manager implementation for Barbican using a single PKCS12 secret
 """
-from OpenSSL import crypto
-
+from cryptography.hazmat.primitives import serialization
+from cryptography.hazmat.primitives.serialization import pkcs12 as c_pkcs12
+from cryptography import x509
 from oslo_config import cfg
 from oslo_log import log as logging
 from oslo_utils import encodeutils
@@ -64,25 +65,29 @@ def store_cert(self, context, certificate, private_key, intermediates=None,
         connection = self.auth.get_barbican_client(context.project_id)
 
         LOG.info("Storing certificate secret '%s' in Barbican.", name)
-        p12 = crypto.PKCS12()
-        p12.set_friendlyname(encodeutils.to_utf8(name))
-        x509_cert = crypto.load_certificate(crypto.FILETYPE_PEM, certificate)
-        p12.set_certificate(x509_cert)
-        x509_pk = crypto.load_privatekey(crypto.FILETYPE_PEM, private_key)
-        p12.set_privatekey(x509_pk)
-        if intermediates:
-            cert_ints = list(cert_parser.get_intermediates_pems(intermediates))
-            x509_ints = [
-                crypto.load_certificate(crypto.FILETYPE_PEM, ci)
-                for ci in cert_ints]
-            p12.set_ca_certificates(x509_ints)
+
         if private_key_passphrase:
             raise exceptions.CertificateStorageException(
                 "Passphrase protected PKCS12 certificates are not supported.")
 
+        x509_cert = x509.load_pem_x509_certificate(certificate)
+        x509_pk = serialization.load_pem_private_key(private_key, None)
+        cas = None
+        if intermediates:
+            cert_ints = list(cert_parser.get_intermediates_pems(intermediates))
+            cas = [
+                x509.load_pem_x509_certificate(ci)
+                for ci in cert_ints]
+
         try:
             certificate_secret = connection.secrets.create(
-                payload=p12.export(),
+                payload=c_pkcs12.serialize_key_and_certificates(
+                    name=encodeutils.safe_encode(name),
+                    key=x509_pk,
+                    cert=x509_cert,
+                    cas=cas,
+                    encryption_algorithm=serialization.NoEncryption()
+                ),
                 expiration=expiration,
                 name=name
             )

octavia/certificates/manager/castellan_mgr.py

@@ -18,7 +18,8 @@
 """
 from castellan.common.objects import opaque_data
 from castellan import key_manager
-from OpenSSL import crypto
+from cryptography.hazmat.primitives import serialization
+from cryptography.hazmat.primitives.serialization import pkcs12 as c_pkcs12
 from oslo_config import cfg
 from oslo_log import log as logging
 
@@ -41,16 +42,20 @@ def __init__(self):
     def store_cert(self, context, certificate, private_key, intermediates=None,
                    private_key_passphrase=None, expiration=None,
                    name="PKCS12 Certificate Bundle"):
-        p12 = crypto.PKCS12()
-        p12.set_certificate(certificate)
-        p12.set_privatekey(private_key)
-        if intermediates:
-            p12.set_ca_certificates(intermediates)
         if private_key_passphrase:
             raise exceptions.CertificateStorageException(
                 "Passphrases protected PKCS12 certificates are not supported.")
 
-        p12_data = opaque_data.OpaqueData(p12.export(), name=name)
+        p12_data = opaque_data.OpaqueData(
+            c_pkcs12.serialize_key_and_certificates(
+                name=None,
+                key=private_key,
+                cert=certificate,
+                cas=intermediates,
+                encryption_algorithm=serialization.NoEncryption()
+            ),
+            name=name
+        )
         self.manager.store(context, p12_data)
 
     def get_cert(self, context, cert_ref, resource_ref=None, check_only=False,

octavia/tests/unit/certificates/manager/test_barbican.py

@@ -15,7 +15,6 @@
 import uuid
 
 from barbicanclient.v1 import secrets
-from OpenSSL import crypto
 
 import octavia.certificates.common.barbican as barbican_common
 import octavia.certificates.common.cert as cert
@@ -138,10 +137,11 @@ def test_get_cert(self):
                          sorted(data.get_intermediates()))
         self.assertIsNone(data.get_private_key_passphrase())
 
-    @mock.patch('OpenSSL.crypto.load_pkcs12')
+    @mock.patch('cryptography.hazmat.primitives.serialization.pkcs12.'
+                'load_pkcs12')
     def test_get_cert_bad_pkcs12(self, mock_load_pkcs12):
 
-        mock_load_pkcs12.side_effect = [crypto.Error]
+        mock_load_pkcs12.side_effect = [ValueError]
 
         # Mock out the client
         self.bc.secrets.get.return_value = self.secret_pkcs12

requirements.txt

@@ -38,7 +38,6 @@ python-barbicanclient>=4.5.2 # Apache-2.0
 python-glanceclient>=2.8.0 # Apache-2.0
 python-novaclient>=9.1.0 # Apache-2.0
 python-cinderclient>=3.3.0 # Apache-2.0
-pyOpenSSL>=19.1.0 # Apache-2.0
 WSME>=0.8.0 # MIT
 Jinja2>=2.10 # BSD License (3 clause)
 taskflow>=4.4.0 # Apache-2.0