allow ssl module to compile if openssl doesn't support SSL 3 (closes #22935)

Patch by Kurt Roeckx.

Lib/test/test_ftplib.py

@@ -689,7 +689,7 @@ class TestTLS_FTPClass(TestCase):
 
     def test_auth_ssl(self):
         try:
-            self.client.ssl_version = ssl.PROTOCOL_SSLv3
+            self.client.ssl_version = ssl.PROTOCOL_SSLv23
             self.client.auth()
             self.assertRaises(ValueError, self.client.auth)
         finally:

Lib/test/test_ssl.py

@@ -2219,20 +2219,24 @@ else:
                         sys.stdout.write(
                             " SSL2 client to SSL23 server test unexpectedly failed:\n %s\n"
                             % str(x))
-            try_protocol_combo(ssl.PROTOCOL_SSLv23, ssl.PROTOCOL_SSLv3, 'SSLv3')
+            if hasattr(ssl, 'PROTOCOL_SSLv3'):
+                try_protocol_combo(ssl.PROTOCOL_SSLv23, ssl.PROTOCOL_SSLv3, 'SSLv3')
             try_protocol_combo(ssl.PROTOCOL_SSLv23, ssl.PROTOCOL_SSLv23, True)
             try_protocol_combo(ssl.PROTOCOL_SSLv23, ssl.PROTOCOL_TLSv1, 'TLSv1')
 
-            try_protocol_combo(ssl.PROTOCOL_SSLv23, ssl.PROTOCOL_SSLv3, 'SSLv3', ssl.CERT_OPTIONAL)
+            if hasattr(ssl, 'PROTOCOL_SSLv3'):
+                try_protocol_combo(ssl.PROTOCOL_SSLv23, ssl.PROTOCOL_SSLv3, 'SSLv3', ssl.CERT_OPTIONAL)
             try_protocol_combo(ssl.PROTOCOL_SSLv23, ssl.PROTOCOL_SSLv23, True, ssl.CERT_OPTIONAL)
             try_protocol_combo(ssl.PROTOCOL_SSLv23, ssl.PROTOCOL_TLSv1, 'TLSv1', ssl.CERT_OPTIONAL)
 
-            try_protocol_combo(ssl.PROTOCOL_SSLv23, ssl.PROTOCOL_SSLv3, 'SSLv3', ssl.CERT_REQUIRED)
+            if hasattr(ssl, 'PROTOCOL_SSLv3'):
+                try_protocol_combo(ssl.PROTOCOL_SSLv23, ssl.PROTOCOL_SSLv3, 'SSLv3', ssl.CERT_REQUIRED)
             try_protocol_combo(ssl.PROTOCOL_SSLv23, ssl.PROTOCOL_SSLv23, True, ssl.CERT_REQUIRED)
             try_protocol_combo(ssl.PROTOCOL_SSLv23, ssl.PROTOCOL_TLSv1, 'TLSv1', ssl.CERT_REQUIRED)
 
             # Server with specific SSL options
-            try_protocol_combo(ssl.PROTOCOL_SSLv23, ssl.PROTOCOL_SSLv3, False,
+            if hasattr(ssl, 'PROTOCOL_SSLv3'):
+                try_protocol_combo(ssl.PROTOCOL_SSLv23, ssl.PROTOCOL_SSLv3, False,
                                server_options=ssl.OP_NO_SSLv3)
             # Will choose TLSv1
             try_protocol_combo(ssl.PROTOCOL_SSLv23, ssl.PROTOCOL_SSLv23, True,
@@ -2242,6 +2246,8 @@ else:
 
 
         @skip_if_broken_ubuntu_ssl
+        @unittest.skipUnless(hasattr(ssl, 'PROTOCOL_SSLv3'),
+                             "OpenSSL is compiled without SSLv3 support")
         def test_protocol_sslv3(self):
             """Connecting to an SSLv3 server with various client options"""
             if support.verbose:
@@ -2269,7 +2275,8 @@ else:
             try_protocol_combo(ssl.PROTOCOL_TLSv1, ssl.PROTOCOL_TLSv1, 'TLSv1', ssl.CERT_REQUIRED)
             if hasattr(ssl, 'PROTOCOL_SSLv2'):
                 try_protocol_combo(ssl.PROTOCOL_TLSv1, ssl.PROTOCOL_SSLv2, False)
-            try_protocol_combo(ssl.PROTOCOL_TLSv1, ssl.PROTOCOL_SSLv3, False)
+            if hasattr(ssl, 'PROTOCOL_SSLv3'):
+                try_protocol_combo(ssl.PROTOCOL_TLSv1, ssl.PROTOCOL_SSLv3, False)
             try_protocol_combo(ssl.PROTOCOL_TLSv1, ssl.PROTOCOL_SSLv23, False,
                                client_options=ssl.OP_NO_TLSv1)
 
@@ -2284,7 +2291,8 @@ else:
             try_protocol_combo(ssl.PROTOCOL_TLSv1_1, ssl.PROTOCOL_TLSv1_1, 'TLSv1.1')
             if hasattr(ssl, 'PROTOCOL_SSLv2'):
                 try_protocol_combo(ssl.PROTOCOL_TLSv1_1, ssl.PROTOCOL_SSLv2, False)
-            try_protocol_combo(ssl.PROTOCOL_TLSv1_1, ssl.PROTOCOL_SSLv3, False)
+            if hasattr(ssl, 'PROTOCOL_SSLv3'):
+                try_protocol_combo(ssl.PROTOCOL_TLSv1_1, ssl.PROTOCOL_SSLv3, False)
             try_protocol_combo(ssl.PROTOCOL_TLSv1_1, ssl.PROTOCOL_SSLv23, False,
                                client_options=ssl.OP_NO_TLSv1_1)
 
@@ -2306,7 +2314,8 @@ else:
                                client_options=ssl.OP_NO_SSLv3|ssl.OP_NO_SSLv2,)
             if hasattr(ssl, 'PROTOCOL_SSLv2'):
                 try_protocol_combo(ssl.PROTOCOL_TLSv1_2, ssl.PROTOCOL_SSLv2, False)
-            try_protocol_combo(ssl.PROTOCOL_TLSv1_2, ssl.PROTOCOL_SSLv3, False)
+            if hasattr(ssl, 'PROTOCOL_SSLv3'):
+                try_protocol_combo(ssl.PROTOCOL_TLSv1_2, ssl.PROTOCOL_SSLv3, False)
             try_protocol_combo(ssl.PROTOCOL_TLSv1_2, ssl.PROTOCOL_SSLv23, False,
                                client_options=ssl.OP_NO_TLSv1_2)
 

Misc/NEWS

@@ -21,6 +21,12 @@ Library
 
 - Issue #22960: Add a context argument to xmlrpclib.ServerProxy.
 
+Build
+-----
+
+- Issue #22935: Allow the ssl module to be compiled if openssl doesn't support
+  SSL 3.
+
 
 What's New in Python 2.7.9 release candidate 1?
 ===============================================

Modules/_ssl.c

@@ -1997,8 +1997,10 @@ context_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
     else if (proto_version == PY_SSL_VERSION_TLS1_2)
         ctx = SSL_CTX_new(TLSv1_2_method());
 #endif
+#ifndef OPENSSL_NO_SSL3
     else if (proto_version == PY_SSL_VERSION_SSL3)
         ctx = SSL_CTX_new(SSLv3_method());
+#endif
 #ifndef OPENSSL_NO_SSL2
     else if (proto_version == PY_SSL_VERSION_SSL2)
         ctx = SSL_CTX_new(SSLv2_method());
@@ -4023,8 +4025,10 @@ init_ssl(void)
     PyModule_AddIntConstant(m, "PROTOCOL_SSLv2",
                             PY_SSL_VERSION_SSL2);
 #endif
+#ifndef OPENSSL_NO_SSL3
     PyModule_AddIntConstant(m, "PROTOCOL_SSLv3",
                             PY_SSL_VERSION_SSL3);
+#endif
     PyModule_AddIntConstant(m, "PROTOCOL_SSLv23",
                             PY_SSL_VERSION_SSL23);
     PyModule_AddIntConstant(m, "PROTOCOL_TLSv1",