The transparent redirector intercepts both local and forwarded packets that match our criteria ( dstport in, but that is configurable). If mitmdump is then started with -T, it opens a TCP connection to the redirector and transmits its process id (pid). Support interception of forwarded trafficįirst, the 'transparent redirector' (platform/windows.py) is started.transparently intercept/debug a local webserver just by running mitmdump -T) Support interception of inbound traffic (e.g.Support interception of outbound traffic.Good news first: mitmproxy now supports intercepting traffic from its own machine. Anyway, thanks for keeping me posted, excited to see what you've come up with! I'm unfamiliar with the internals of mitmproxy (compared to you, haha :)) but from other code I've written, and if winDivert can accept filters specifying address AND port, this should work for sure. So yeah, I guess you'd need to avoid that.ĭid you play around with the idea of binding all listening sockets for the proxy to 127.0.0.1:80/443 and all outbound/upstream to say 127.1.1.1:80/443? I failed to grasp why you thought this wouldn't be successful. The drawback/failure of my original attempts at this by spoofing DNS was that absolutely all traffic (any port/protocol) from the process was redirected, obviously, because of the bs A-Record. So basically, you're looking at using this winapi call to sort traffic interception based on the binding process? I assume you'd be further checking the port somehow. Hey, sorry I havn't been contributing much yet, I'm side-tracked trying to compile and set up openframeworks with mingw/eclipse in windows. Reply to this email directly or view it on GitHub I'll look in to this later and update with my results. Just requires modifying the binding of the upstream port inside I'll let you know as soon as I knowĪm 17:04 schrieb 'Jesse Nicholson' more I think about this, the more sure I become that this could easily Not sure yet whether this is already accessible when we I fiddled around with the GetTcpTable2 syscallĪfter your last post, which in theory gives us a nice Outbound Port -> I'm not sure how binding to a different ip behaves, that Using just a fixed outbound port won't work, as we often have multipleĬonnections to the same server,port tuple, which would make them Retrospective, I'm not entirely sure why this was the case I only remember (which then gets rewritten again), but that failed with SSL IIRC. Sounds good! I initially tried connecting to a meta-address from the proxy If you now any nice way of intercepting traffic from the Windows machine itself, please let me know! If you have any further issues: Please don't hesistate to ask! :-) There might be some minor issues introduced by the latest release of PyDivert (which installs Windivert automatically), I'm happy to help here if you don't figure it out.Īs a last note, any pull requests that improve either the documentation of this feature or the feature itself are highly appreciated. Step 2 is usually not neccessary as the redirect script is started in transparent mode by default, but may output more descriptive error messages at this point. You should now be able to observe traffic. Sometimes this may still work for a limited time, probably because your Windows machine emitted ICMP Redirect packets previously (which tell the client that there's a shorter route - we block them as soon as the script is active.). This should (a) run without errors and (b) break forwarding of port 80 and 443 traffic (verify that using your device again, but don't get fooled by some aggressive browser caching). You can verify that IP forwarding works by configuring any client to use you Windows machine as the Gateway - this should work now and you can take a look at the (unintercepted) traffic in Wireshark. Enable IP forwarding ( - not sure if the last step is neccessary, I'd love to hear if it works for you without).We can't distinguish between an outbound connection from a non-mitmproxy app, and an outbound connection from mitmproxy itself - if you want to intercept your Windows traffic, you should use an external host to run mitmproxy. This means that mitmproxy will NOT redirect traffic coming from the machine running mitmproxy itself.

Note that redirection only applies to inbound traffic. Nevertheless, our lack of documentation and Windows support didn't seem to discourage you so far, so here's the rough path: In other words, I developed that for my personal convenience. to give a false impression of Windows support. Consequently, the transparent mode is not documented/advertised/. Nice to see someone trying this out so early! 😉 Sorry for the confusion - we don't support Windows officially, in particular because curses/ncurses/mitmproxy doesn't work, only the non-GUI mitmdump does.

Mitmproxy transparent windows