gh-85162: Add HTTPSServer to http.server to serve files over HTTPS (#129607)

The `http.server` module now supports serving over HTTPS using the `http.server.HTTPSServer` class.
This functionality is also exposed by the command-line interface (`python -m http.server`) through the
`--tls-cert`, `--tls-key` and `--tls-password-file` options.

Author: donBarbos

Doc/library/http.server.rst

@@ -51,9 +51,49 @@ handler.  Code to create and run the server looks like this::
    .. versionadded:: 3.7
 
 
-The :class:`HTTPServer` and :class:`ThreadingHTTPServer` must be given
-a *RequestHandlerClass* on instantiation, of which this module
-provides three different variants:
+.. class:: HTTPSServer(server_address, RequestHandlerClass,\
+                       bind_and_activate=True, *, certfile, keyfile=None,\
+                       password=None, alpn_protocols=None)
+
+   Subclass of :class:`HTTPServer` with a wrapped socket using the :mod:`ssl` module.
+   If the :mod:`ssl` module is not available, instantiating a :class:`!HTTPSServer`
+   object fails with a :exc:`RuntimeError`.
+
+   The *certfile* argument is the path to the SSL certificate chain file,
+   and the *keyfile* is the path to file containing the private key.
+
+   A *password* can be specified for files protected and wrapped with PKCS#8,
+   but beware that this could possibly expose hardcoded passwords in clear.
+
+   .. seealso::
+
+      See :meth:`ssl.SSLContext.load_cert_chain` for additional
+      information on the accepted values for *certfile*, *keyfile*
+      and *password*.
+
+   When specified, the *alpn_protocols* argument must be a sequence of strings
+   specifying the "Application-Layer Protocol Negotiation" (ALPN) protocols
+   supported by the server. ALPN allows the server and the client to negotiate
+   the application protocol during the TLS handshake.
+
+   By default, it is set to ``["http/1.1"]``, meaning the server supports HTTP/1.1.
+
+   .. versionadded:: next
+
+.. class:: ThreadingHTTPSServer(server_address, RequestHandlerClass,\
+                                bind_and_activate=True, *, certfile, keyfile=None,\
+                                password=None, alpn_protocols=None)
+
+   This class is identical to :class:`HTTPSServer` but uses threads to handle
+   requests by inheriting from :class:`~socketserver.ThreadingMixIn`. This is
+   analogous to :class:`ThreadingHTTPServer` only using :class:`HTTPSServer`.
+
+   .. versionadded:: next
+
+
+The :class:`HTTPServer`, :class:`ThreadingHTTPServer`, :class:`HTTPSServer` and
+:class:`ThreadingHTTPSServer` must be given a *RequestHandlerClass* on
+instantiation, of which this module provides three different variants:
 
 .. class:: BaseHTTPRequestHandler(request, client_address, server)
 
@@ -542,6 +582,35 @@ The following options are accepted:
    are not intended for use by untrusted clients and may be vulnerable
    to exploitation. Always use within a secure environment.
 
+.. option:: --tls-cert
+
+   Specifies a TLS certificate chain for HTTPS connections::
+
+      python -m http.server --tls-cert fullchain.pem
+
+   .. versionadded:: next
+
+.. option:: --tls-key
+
+   Specifies a private key file for HTTPS connections.
+
+   This option requires ``--tls-cert`` to be specified.
+
+   .. versionadded:: next
+
+.. option:: --tls-password-file
+
+   Specifies the password file for password-protected private keys::
+
+      python -m http.server \
+             --tls-cert cert.pem \
+             --tls-key key.pem \
+             --tls-password-file password.txt
+
+   This option requires `--tls-cert`` to be specified.
+
+   .. versionadded:: next
+
 
 .. _http.server-security:
 

Doc/whatsnew/3.14.rst

@@ -728,6 +728,17 @@ http
   module allow the browser to apply its default dark mode.
   (Contributed by Yorik Hansen in :gh:`123430`.)
 
+* The :mod:`http.server` module now supports serving over HTTPS using the
+  :class:`http.server.HTTPSServer` class. This functionality is exposed by
+  the command-line interface (``python -m http.server``) through the following
+  options:
+
+  * ``--tls-cert <path>``: Path to the TLS certificate file.
+  * ``--tls-key <path>``: Optional path to the private key file.
+  * ``--tls-password-file <path>``: Optional path to the password file for the private key.
+
+  (Contributed by Semyon Moroz in :gh:`85162`.)
+
 
 imaplib
 -------

Lib/http/server.py

@@ -83,8 +83,10 @@
 __version__ = "0.6"
 
 __all__ = [
-    "HTTPServer", "ThreadingHTTPServer", "BaseHTTPRequestHandler",
-    "SimpleHTTPRequestHandler", "CGIHTTPRequestHandler",
+    "HTTPServer", "ThreadingHTTPServer",
+    "HTTPSServer", "ThreadingHTTPSServer",
+    "BaseHTTPRequestHandler", "SimpleHTTPRequestHandler",
+    "CGIHTTPRequestHandler",
 ]
 
 import copy
@@ -149,6 +151,47 @@ class ThreadingHTTPServer(socketserver.ThreadingMixIn, HTTPServer):
     daemon_threads = True
 
 
+class HTTPSServer(HTTPServer):
+    def __init__(self, server_address, RequestHandlerClass,
+                 bind_and_activate=True, *, certfile, keyfile=None,
+                 password=None, alpn_protocols=None):
+        try:
+            import ssl
+        except ImportError:
+            raise RuntimeError("SSL module is missing; "
+                               "HTTPS support is unavailable")
+
+        self.ssl = ssl
+        self.certfile = certfile
+        self.keyfile = keyfile
+        self.password = password
+        # Support by default HTTP/1.1
+        self.alpn_protocols = (
+            ["http/1.1"] if alpn_protocols is None else alpn_protocols
+        )
+
+        super().__init__(server_address,
+                         RequestHandlerClass,
+                         bind_and_activate)
+
+    def server_activate(self):
+        """Wrap the socket in SSLSocket."""
+        super().server_activate()
+        context = self._create_context()
+        self.socket = context.wrap_socket(self.socket, server_side=True)
+
+    def _create_context(self):
+        """Create a secure SSL context."""
+        context = self.ssl.create_default_context(self.ssl.Purpose.CLIENT_AUTH)
+        context.load_cert_chain(self.certfile, self.keyfile, self.password)
+        context.set_alpn_protocols(self.alpn_protocols)
+        return context
+
+
+class ThreadingHTTPSServer(socketserver.ThreadingMixIn, HTTPSServer):
+    daemon_threads = True
+
+
 class BaseHTTPRequestHandler(socketserver.StreamRequestHandler):
 
     """HTTP request handler base class.
@@ -1263,20 +1306,29 @@ def _get_best_family(*address):
 
 def test(HandlerClass=BaseHTTPRequestHandler,
          ServerClass=ThreadingHTTPServer,
-         protocol="HTTP/1.0", port=8000, bind=None):
+         protocol="HTTP/1.0", port=8000, bind=None,
+         tls_cert=None, tls_key=None, tls_password=None):
     """Test the HTTP request handler class.
 
     This runs an HTTP server on port 8000 (or the port argument).
 
     """
     ServerClass.address_family, addr = _get_best_family(bind, port)
     HandlerClass.protocol_version = protocol
-    with ServerClass(addr, HandlerClass) as httpd:
+
+    if tls_cert:
+        server = ThreadingHTTPSServer(addr, HandlerClass, certfile=tls_cert,
+                                      keyfile=tls_key, password=tls_password)
+    else:
+        server = ServerClass(addr, HandlerClass)
+
+    with server as httpd:
         host, port = httpd.socket.getsockname()[:2]
         url_host = f'[{host}]' if ':' in host else host
+        protocol = 'HTTPS' if tls_cert else 'HTTP'
         print(
-            f"Serving HTTP on {host} port {port} "
-            f"(http://{url_host}:{port}/) ..."
+            f"Serving {protocol} on {host} port {port} "
+            f"({protocol.lower()}://{url_host}:{port}/) ..."
         )
         try:
             httpd.serve_forever()
@@ -1301,10 +1353,31 @@ def test(HandlerClass=BaseHTTPRequestHandler,
                         default='HTTP/1.0',
                         help='conform to this HTTP version '
                              '(default: %(default)s)')
+    parser.add_argument('--tls-cert', metavar='PATH',
+                        help='path to the TLS certificate chain file')
+    parser.add_argument('--tls-key', metavar='PATH',
+                        help='path to the TLS key file')
+    parser.add_argument('--tls-password-file', metavar='PATH',
+                        help='path to the password file for the TLS key')
     parser.add_argument('port', default=8000, type=int, nargs='?',
                         help='bind to this port '
                              '(default: %(default)s)')
     args = parser.parse_args()
+
+    if not args.tls_cert and args.tls_key:
+        parser.error("--tls-key requires --tls-cert to be set")
+
+    tls_key_password = None
+    if args.tls_password_file:
+        if not args.tls_cert:
+            parser.error("--tls-password-file requires --tls-cert to be set")
+
+        try:
+            with open(args.tls_password_file, "r", encoding="utf-8") as f:
+                tls_key_password = f.read().strip()
+        except OSError as e:
+            parser.error(f"Failed to read TLS password file: {e}")
+
     if args.cgi:
         handler_class = CGIHTTPRequestHandler
     else:
@@ -1330,4 +1403,7 @@ def finish_request(self, request, client_address):
         port=args.port,
         bind=args.bind,
         protocol=args.protocol,
+        tls_cert=args.tls_cert,
+        tls_key=args.tls_key,
+        tls_password=tls_key_password,
     )