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87 lines
2.9 KiB
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87 lines
2.9 KiB
ReStructuredText
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.. _transparent-dhcp:
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Transparently proxify virtual machines
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======================================
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This walkthrough illustrates how to set up transparent proxying with mitmproxy.
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We use VirtualBox VMs with an Ubuntu proxy machine in this example,
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but the general *Internet <--> Proxy VM <--> (Virtual) Internal Network* setup can be applied to other setups.
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1. Configure Proxy VM
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---------------------
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On the proxy machine, **eth0** is connected to the internet. **eth1** is connected to the internal
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network that will be proxified and configured to use a static ip (192.168.3.1).
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VirtualBox configuration
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^^^^^^^^^^^^^^^^^^^^^^^^
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.. image:: transparent-dhcp/step1_vbox_eth0.png
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.. image:: transparent-dhcp/step1_vbox_eth1.png
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VM Network Configuration
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^^^^^^^^^^^^^^^^^^^^^^^^
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.. image:: transparent-dhcp/step1_proxy.png
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:align: center
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2. Configure DHCP and DNS
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-------------------------
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We use dnsmasq to provide DHCP and DNS in our internal network.
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Dnsmasq is a lightweight server designed to provide DNS (and optionally
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DHCP and TFTP) services to a small-scale network.
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- Before we get to that, we need to fix some Ubuntu quirks:
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**Ubuntu >12.04** runs an internal dnsmasq instance (listening on loopback only) by default
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`[1] <https://www.stgraber.org/2012/02/24/dns-in-ubuntu-12-04/>`_. For our use case, this needs to be
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disabled by changing ``dns=dnsmasq`` to ``#dns=dnsmasq`` in **/etc/NetworkManager/NetworkManager.conf**
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and running
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>>> sudo restart network-manager
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afterwards.
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- Now, dnsmasq can be be installed and configured:
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>>> sudo apt-get install dnsmasq
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Replace **/etc/dnsmasq.conf** with the following configuration:
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.. code-block:: none
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# Listen for DNS requests on the internal network
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interface=eth1
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# Act as a DHCP server, assign IP addresses to clients
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dhcp-range=192.168.3.10,192.168.3.100,96h
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# Broadcast gateway and dns server information
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dhcp-option=option:router,192.168.3.1
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dhcp-option=option:dns-server,192.168.3.1
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Apply changes:
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>>> sudo service dnsmasq restart
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Your **proxied machine** in the internal virtual network should now receive an IP address via DHCP:
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.. image:: transparent-dhcp/step2_proxied_vm.png
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3. Redirect traffic to mitmproxy
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------------------------------------------
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To redirect traffic to mitmproxy, we need to add two iptables rules:
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.. code-block:: none
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iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 80 -j REDIRECT --to-port 8080
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iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 443 -j REDIRECT --to-port 8080
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4. Run mitmproxy
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----------------
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Finally, we can run mitmproxy in transparent mode with
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>>> mitmproxy -T
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The proxied machine cannot to leak any data outside of HTTP or DNS requests.
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If required, you can now :ref:`install the mitmproxy certificates on the proxied machine <certinstall>`.
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