Archive for January, 2013

Python xmlrpcserver with HTTPS support and basic authentication

6

For a project I’m working on at Formatics.nl I needed a Python based multithreaded xmlrpcserver with HTTPS support, HTTP basic authentication and capable of running on any port. After looking into solutions which required some sort of server for the HTTPS and basic autentication parts I decided to go for a better solution to try to add the HTTPS support and basic authentication to the Python xmlrpsserver itself. That way we would have a simple and fast solution which could run from any box on any port. Looking around on the net I found various solutions for every requirement but nothing which combined it all into one solution. So after combining various bits and pieces I came up with a Python xmlrpcserver with HTTPS and basic authentication support.

As the code used came from various free-software projects and locations I decided to share the server with the world so that it might benefit others.

For the HTTPS you need OpenSSL certificates, use your existing PEM formatted one or just create one yourself.

$ openssl genrsa -out privkey.pem 2048
$ openssl req -new -key privkey.pem -out cert.csr
$ openssl req -new -x509 -key privkey.pem -out cacert.pem -days 1095

And here’s the server

from SocketServer import ThreadingMixIn, BaseServer
from SimpleXMLRPCServer import SimpleXMLRPCServer, SimpleXMLRPCRequestHandler, SimpleXMLRPCDispatcher
import socket
from OpenSSL import SSL
from base64 import b64decode

from threading import Thread, Condition
from thread import start_new_thread

import traceback
import time

# static stuff
DEFAULTKEYFILE = 'privkey.pem'  # Replace with your PEM formatted key file
DEFAULTCERTFILE = 'cacert.pem'  # Replace with your PEM formatted certificate file

class Services:
    def give_me_time(self):
        return time.asctime()

class CustomThreadingMixIn:
    """Mix-in class to handle each request in a new thread."""
    # Decides how threads will act upon termination of the main process
    daemon_threads = True

    def process_request_thread(self, request, client_address):
        """Same as in BaseServer but as a thread.
        In addition, exception handling is done here.
        """
        try:
            self.finish_request(request, client_address)
            self.close_request(request)
        except (socket.error, SSL.SysCallError), why:
            print 'socket.error finishing request from "%s"; Error: %s' % (client_address, str(why))
            self.close_request(request)
        except:
            self.handle_error(request, client_address)
            self.close_request(request)

    def process_request(self, request, client_address):
        """Start a new thread to process the request."""
        t = Thread(target=self.process_request_thread, args=(request, client_address))
        if self.daemon_threads:
            t.setDaemon(1)
        t.start()

class MyXMLRPCServer(CustomThreadingMixIn, SimpleXMLRPCServer):
    def __init__(self, ip, port, keyFile=DEFAULTKEYFILE, certFile=DEFAULTCERTFILE, logRequests=True):
        self.logRequests = logRequests
        class VerifyingRequestHandler(SimpleXMLRPCRequestHandler):

            def setup(myself):
                myself.connection = myself.request
                myself.rfile = socket._fileobject(myself.request, "rb", myself.rbufsize)
                myself.wfile = socket._fileobject(myself.request, "wb", myself.wbufsize)

            def address_string(myself):
                "getting 'FQDN' from host seems to stall on some ip addresses, so... just (quickly!) return raw host address"
                host, port = myself.client_address
                #return socket.getfqdn(host)
                return host

            def do_POST(myself):
                """Handles the HTTPS POST request.
                It was copied out from SimpleXMLRPCServer.py and modified to shutdown the socket cleanly.
                """
                try:
                    # get arguments
                    data = myself.rfile.read(int(myself.headers["content-length"]))
                    # In previous versions of SimpleXMLRPCServer, _dispatch
                    # could be overridden in this class, instead of in
                    # SimpleXMLRPCDispatcher. To maintain backwards compatibility,
                    # check to see if a subclass implements _dispatch and dispatch
                    # using that method if present.
                    response = myself.server._marshaled_dispatch(data, getattr(myself, '_dispatch', None))
                except Exception, info: # This should only happen if the module is buggy
                    print "ERROR do_POST: ", info
                    print "Traceback follows:", traceback.print_exc()

                    # internal error, report as HTTP server error
                    myself.send_response(500)
                    myself.end_headers()
                else:
                    # got a valid XML RPC response
                    myself.send_response(200)
                    myself.send_header("Content-type", "text/xml")
                    myself.send_header("Content-length", str(len(response)))
                    myself.end_headers()
                    myself.wfile.write(response)

                    # shut down the connection
                    myself.wfile.flush()
                    myself.connection.shutdown() # Modified here!

            def do_GET(myself):
                """Handles the HTTP GET request.

                Interpret all HTTP GET requests as requests for server
                documentation.
                """
                # Check that the path is legal
                if not myself.is_rpc_path_valid():
                    myself.report_404()
                    return

                response = myself.server.generate_html_documentation()
                myself.send_response(200)
                myself.send_header("Content-type", "text/html")
                myself.send_header("Content-length", str(len(response)))
                myself.end_headers()
                myself.wfile.write(response)

                # shut down the connection
                myself.wfile.flush()
                myself.connection.shutdown() # Modified here!

            def report_404(myself):
                # Report a 404 error
                myself.send_response(404)
                response = 'No such page'
                myself.send_header("Content-type", "text/plain")
                myself.send_header("Content-length", str(len(response)))
                myself.end_headers()
                myself.wfile.write(response)
                # shut down the connection
                myself.wfile.flush()
                myself.connection.shutdown() # Modified here!

            def parse_request(myself):
                if SimpleXMLRPCRequestHandler.parse_request(myself):
                    basic, foo, encoded = myself.headers.get('Authorization').partition(' ')
                    username, foo, password = b64decode(encoded).partition(':')
                    #print username, foo, password
                    if username == 'admin':
                        return True
                    else:
                        myself.send_error(401, 'Authentication failed')
                        return False
        SimpleXMLRPCDispatcher.__init__(self, False, None)
        BaseServer.__init__(self, (ip, port), VerifyingRequestHandler)

        # SSL socket stuff
        ctx = SSL.Context(SSL.SSLv23_METHOD)
        ctx.use_privatekey_file(keyFile)
        ctx.use_certificate_file(certFile)
        self.socket = SSL.Connection(ctx, socket.socket(self.address_family, self.socket_type))
        self.server_bind()
        self.server_activate()

        self.funcs = {}
        self.register_introspection_functions()
        self.register_instance(Services())

        # requests count and condition, to allow for keyboard quit via CTL-C
        self.requests = 0
        self.rCondition = Condition()

    def startup(self):
        #run until quit signaled from keyboard
        print 'server starting; hit CTRL-C to quit...'
        while True:
            try:
                self.rCondition.acquire()
                start_new_thread(self.handle_request, ()) # we do this async, because handle_request blocks!
                while not self.requests:
                    self.rCondition.wait(timeout=3.0)
                if self.requests:
                    self.requests -= 1
                self.rCondition.release()
            except KeyboardInterrupt:
                print "quit signaled, i'm done."
                return

    def get_request(self):
        request, client_address = self.socket.accept()
        self.rCondition.acquire()
        self.requests += 1
        self.rCondition.notifyAll()
        self.rCondition.release()
        return (request, client_address)

    def listMethods(self):
        """return list of method names (strings)"""
        methodNames = self.funcs.keys()
        methodNames.sort()
        return methodNames

    def methodHelp(self, methodName):
        """method help"""
        if methodName in self.funcs:
            return self.funcs[methodName].__doc__
        else:
            raise Exception('method "%s" is not supported' % methodName)

if __name__ == '__main__':
    import sys
    if len(sys.argv) == 3:
        host = sys.argv[1]
        port = int(sys.argv[2])
    else:
        host = 'localhost'
        port = 8111

    server = MyXMLRPCServer(host, port, logRequests=True)
    # Run the server's main loop
    sa = server.socket.getsockname()
    print "Serving HTTPS on", sa[0], "port", sa[1]

    server.startup()

For a client use someting like this

from xmlrpclib import ServerProxy

user = 'stas'
pas = 'stas'
p = ServerProxy('https://%s:%s@localhost:8111' % (user, pas))
print p.give_me_time()

There are pizzas and there are Pizzas

0

 

Nothing beats an Italian made pizza oven, well perhaps a real Italian wood fueled oven.

But this is the next best thing 🙂

pizza

http://www.g3ferrari.com/en/index.asp

 

Linux wifi intel Centrino Advanced-N 6235 slow

0

There seems to be an issue with the new Intel Centrino Advanced-N 6235 wifi chip when running in N mode. This problem occurs in all current kernels, as of this writing  <= 3.7.

The problem lies in the iwlwifi driver and disabling the N mode support seems to be an reasonable solution for the time beeing.

First check if you get an improvement:

$ sudo modprobe iwlwifi 11n_disable=1

If it performs better make it permanent:

$ sudo su#  echo options iwlwifi 11n_disable=1 | sudo tee /etc/modprobe.d/51-disable-6235-11n.conf

 

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