Deprecated passing X509 objects to add_extra_chain_cert

CHANGELOG.rst

@@ -15,7 +15,7 @@ Deprecations:
 
 - Deprecated ``OpenSSL.rand`` - callers should use ``os.urandom()`` instead.
 - Deprecated ``OpenSSL.crypto.get_elliptic_curves`` and ``OpenSSL.crypto.get_elliptic_curve``, as well as passing the reult of them to ``OpenSSL.SSL.Context.set_tmp_ecdh``, users should instead pass curves from ``cryptography``.
-- Deprecated passing ``X509`` objects to ``OpenSSL.SSL.Context.use_certificate`` and ``OpenSSL.SSL.Connection.use_certificate``, users should instead pass ``cryptography.x509.Certificate`` instances. This is in preparation for deprecating pyOpenSSL's ``X509`` entirely.
+- Deprecated passing ``X509`` objects to ``OpenSSL.SSL.Context.use_certificate``, ``OpenSSL.SSL.Connection.use_certificate``, and ``OpenSSL.SSL.Context.add_extra_chain_cert``, users should instead pass ``cryptography.x509.Certificate`` instances. This is in preparation for deprecating pyOpenSSL's ``X509`` entirely.
 
 Changes:
 ^^^^^^^^

src/OpenSSL/SSL.py

@@ -1151,15 +1151,24 @@ def use_certificate(self, cert: X509 | x509.Certificate) -> None:
         if not use_result:
             _raise_current_error()
 
-    def add_extra_chain_cert(self, certobj: X509) -> None:
+    def add_extra_chain_cert(self, certobj: X509 | x509.Certificate) -> None:
         """
         Add certificate to chain
 
         :param certobj: The X509 certificate object to add to the chain
         :return: None
         """
         if not isinstance(certobj, X509):
-            raise TypeError("certobj must be an X509 instance")
+            certobj = X509.from_cryptography(certobj)
+        else:
+            warnings.warn(
+                (
+                    "Passing pyOpenSSL X509 objects is deprecated. You "
+                    "should use a cryptography.x509.Certificate instead."
+                ),
+                DeprecationWarning,
+                stacklevel=2,
+            )
 
         copy = _lib.X509_dup(certobj._x509)
         add_result = _lib.SSL_CTX_add_extra_chain_cert(self._context, copy)

tests/test_ssl.py

@@ -2586,7 +2586,7 @@ def test_get_peer_cert_chain(self):
         serverContext.use_privatekey(skey)
         serverContext.use_certificate(scert)
         serverContext.add_extra_chain_cert(icert)
-        serverContext.add_extra_chain_cert(cacert)
+        serverContext.add_extra_chain_cert(cacert.to_cryptography())
         server = Connection(serverContext, None)
         server.set_accept_state()
 
@@ -2630,7 +2630,7 @@ def test_get_verified_chain(self):
         serverContext = Context(SSLv23_METHOD)
         serverContext.use_privatekey(skey)
         serverContext.use_certificate(scert)
-        serverContext.add_extra_chain_cert(icert)
+        serverContext.add_extra_chain_cert(icert.to_cryptography())
         serverContext.add_extra_chain_cert(cacert)
         server = Connection(serverContext, None)
         server.set_accept_state()