Allow combined certificate/key files for SSL

Allows the ssl_key_file parameter to be excluded
during SSL operation to support combined certificate/key files.

Closes-Bug: #1303312
Change-Id: Ied5c7a7657e0e26eda31305fc96104c6593e9593

neutron/tests/unit/test_wsgi.py

@@ -1095,6 +1095,25 @@ class TestWSGIServerWithSSL(base.BaseTestCase):
 
         server.stop()
 
+    def test_app_using_ssl_combined_cert_and_key(self):
+        CONF.set_default('use_ssl', True)
+        CONF.set_default("ssl_cert_file",
+                         os.path.join(TEST_VAR_DIR, 'certandkey.pem'))
+
+        greetings = 'Hello, World!!!'
+
+        @webob.dec.wsgify
+        def hello_world(req):
+            return greetings
+
+        server = wsgi.Server("test_app")
+        server.start(hello_world, 0, host="127.0.0.1")
+
+        response = urllib2.urlopen('https://127.0.0.1:%d/' % server.port)
+        self.assertEqual(greetings, response.read())
+
+        server.stop()
+
     def test_app_using_ipv6_and_ssl(self):
         CONF.set_default('use_ssl', True)
         CONF.set_default("ssl_cert_file",

neutron/tests/var/certandkey.pem

@@ -0,0 +1,81 @@
+-----BEGIN CERTIFICATE-----
+MIIFLjCCAxYCAQEwDQYJKoZIhvcNAQEFBQAwYTELMAkGA1UEBhMCQVUxEzARBgNV
+BAgTClNvbWUtU3RhdGUxFTATBgNVBAoTDE9wZW5zdGFjayBDQTESMBAGA1UECxMJ
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+-----END CERTIFICATE-----
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----

neutron/wsgi.py

@@ -142,7 +142,9 @@ class Server(object):
                 raise RuntimeError(_("Unable to find ssl_cert_file "
                                      ": %s") % CONF.ssl_cert_file)
 
-            if not os.path.exists(CONF.ssl_key_file):
+            # ssl_key_file is optional because the key may be embedded in the
+            # certificate file
+            if CONF.ssl_key_file and not os.path.exists(CONF.ssl_key_file):
                 raise RuntimeError(_("Unable to find "
                                      "ssl_key_file : %s") % CONF.ssl_key_file)