Dependancy free

libs/cherrypy/wsgiserver/ssl_builtin.py

@@ -0,0 +1,91 @@
+"""A library for integrating Python's builtin ``ssl`` library with CherryPy.
+
+The ssl module must be importable for SSL functionality.
+
+To use this module, set ``CherryPyWSGIServer.ssl_adapter`` to an instance of
+``BuiltinSSLAdapter``.
+"""
+
+try:
+    import ssl
+except ImportError:
+    ssl = None
+
+try:
+    from _pyio import DEFAULT_BUFFER_SIZE
+except ImportError:
+    try:
+        from io import DEFAULT_BUFFER_SIZE
+    except ImportError:
+        DEFAULT_BUFFER_SIZE = -1
+
+import sys
+
+from cherrypy import wsgiserver
+
+
+class BuiltinSSLAdapter(wsgiserver.SSLAdapter):
+    """A wrapper for integrating Python's builtin ssl module with CherryPy."""
+    
+    certificate = None
+    """The filename of the server SSL certificate."""
+    
+    private_key = None
+    """The filename of the server's private key file."""
+    
+    def __init__(self, certificate, private_key, certificate_chain=None):
+        if ssl is None:
+            raise ImportError("You must install the ssl module to use HTTPS.")
+        self.certificate = certificate
+        self.private_key = private_key
+        self.certificate_chain = certificate_chain
+    
+    def bind(self, sock):
+        """Wrap and return the given socket."""
+        return sock
+    
+    def wrap(self, sock):
+        """Wrap and return the given socket, plus WSGI environ entries."""
+        try:
+            s = ssl.wrap_socket(sock, do_handshake_on_connect=True,
+                    server_side=True, certfile=self.certificate,
+                    keyfile=self.private_key, ssl_version=ssl.PROTOCOL_SSLv23)
+        except ssl.SSLError:
+            e = sys.exc_info()[1]
+            if e.errno == ssl.SSL_ERROR_EOF:
+                # This is almost certainly due to the cherrypy engine
+                # 'pinging' the socket to assert it's connectable;
+                # the 'ping' isn't SSL.
+                return None, {}
+            elif e.errno == ssl.SSL_ERROR_SSL:
+                if e.args[1].endswith('http request'):
+                    # The client is speaking HTTP to an HTTPS server.
+                    raise wsgiserver.NoSSLError
+                elif e.args[1].endswith('unknown protocol'):
+                    # The client is speaking some non-HTTP protocol.
+                    # Drop the conn.
+                    return None, {}
+            raise
+        return s, self.get_environ(s)
+    
+    # TODO: fill this out more with mod ssl env
+    def get_environ(self, sock):
+        """Create WSGI environ entries to be merged into each request."""
+        cipher = sock.cipher()
+        ssl_environ = {
+            "wsgi.url_scheme": "https",
+            "HTTPS": "on",
+            'SSL_PROTOCOL': cipher[1],
+            'SSL_CIPHER': cipher[0]
+##            SSL_VERSION_INTERFACE 	string 	The mod_ssl program version
+##            SSL_VERSION_LIBRARY 	string 	The OpenSSL program version
+            }
+        return ssl_environ
+    
+    if sys.version_info >= (3, 0):
+        def makefile(self, sock, mode='r', bufsize=DEFAULT_BUFFER_SIZE):
+            return wsgiserver.CP_makefile(sock, mode, bufsize)
+    else:
+        def makefile(self, sock, mode='r', bufsize=DEFAULT_BUFFER_SIZE):
+            return wsgiserver.CP_fileobject(sock, mode, bufsize)
+