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Re: Learning python networking

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On Jan 15, 2014, at 11:31 AM, Chris Angelico <rosuav@gmail.com> wrote:

> On Thu, Jan 16, 2014 at 3:25 AM, William Ray Wing <wrw@mac.com> wrote:
>> On Jan 15, 2014, at 7:52 AM, Chris Angelico <rosuav@gmail.com> wrote:
>>> One of the fundamentals of the internet is that connections *will*
>>> break. A friend of mine introduced me to Magic: The Gathering via a
>>> program that couldn't handle drop-outs, and it got extremely
>>> frustrating - we couldn't get a game going. Build your server such
>>> that your clients can disconnect and reconnect, and you protect
>>> yourself against half the problem; allow them to connect and kick the
>>> other connection off, and you solve the other half.
>> 
>> But note VERY carefully that this can open HUGE security holes if not done with extreme care.
>> 
>> Leaving a dangling connection (not session, TCP closes sessions) open is an invitation so bad things happening.
> 
> Not sure what you mean here. I'm assuming an authentication system
> that stipulates one single active connection per authenticated user
> (if you reauthenticate with the same credentials, it'll disconnect the
> other one on the presumption that the connection's been lost). In
> terms of resource wastage, there's no difference between disconnecting
> now and letting it time out, and waiting the ten minutes (or whatever)
> and then terminating cleanly. Or do you mean another user gaining
> access? It's still governed by the same authentication.
> 

I was assuming another user picking up the connection using sniffed credentials (and yes, despite all the work on ssh, not all man-in-the-middle attacks have been killed).

-Bill

> ChrisA
> -- 
> https://mail.python.org/mailman/listinfo/python-list

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Learning python networking Paul Pittlerson <menkomigen6@gmail.com> - 2014-01-08 14:27 -0800
  Re: Learning python networking Chris Angelico <rosuav@gmail.com> - 2014-01-09 10:29 +1100
    Re: Learning python networking Paul Pittlerson <menkomigen6@gmail.com> - 2014-01-15 02:37 -0800
      Re: Learning python networking Denis McMahon <denismfmcmahon@gmail.com> - 2014-01-15 11:11 +0000
      Re: Learning python networking Chris Angelico <rosuav@gmail.com> - 2014-01-15 23:52 +1100
      Re: Learning python networking "Frank Millman" <frank@chagford.com> - 2014-01-15 15:31 +0200
      Re: Learning python networking Chris Angelico <rosuav@gmail.com> - 2014-01-16 01:07 +1100
      Re: Learning python networking Chris Angelico <rosuav@gmail.com> - 2014-01-16 02:36 +1100
      Re: Learning python networking Chris Angelico <rosuav@gmail.com> - 2014-01-16 03:31 +1100
      Re: Learning python networking Chris Angelico <rosuav@gmail.com> - 2014-01-16 03:32 +1100
      Re: Learning python networking William Ray Wing <wrw@mac.com> - 2014-01-15 11:43 -0500
      Re: Learning python networking Chris Angelico <rosuav@gmail.com> - 2014-01-16 04:07 +1100
      Re: Learning python networking William Ray Wing <wrw@mac.com> - 2014-01-15 11:25 -0500
  Re: Learning python networking Dan Stromberg <drsalists@gmail.com> - 2014-01-08 15:53 -0800
  Re: Learning python networking Chris Angelico <rosuav@gmail.com> - 2014-01-09 11:07 +1100
  Re: Learning python networking Dan Stromberg <drsalists@gmail.com> - 2014-01-08 19:49 -0800
    Re: Learning python networking Alister <alister.ware@ntlworld.com> - 2014-01-09 11:32 +0000
  Re: Learning python networking Chris Angelico <rosuav@gmail.com> - 2014-01-09 15:20 +1100

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