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46 lines
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.. _linux:
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Linux
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=====
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On Linux, mitmproxy integrates with the iptables redirection mechanism to
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achieve transparent mode.
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1. :ref:`Install the mitmproxy certificate on the test device <certinstall>`
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2. Enable IP forwarding:
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>>> sysctl -w net.ipv4.ip_forward=1
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You may also want to consider enabling this permanently in ``/etc/sysctl.conf``.
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3. If your target machine is on the same physical network and you configured it to use a custom
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gateway, disable ICMP redirects:
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>>> echo 0 | sudo tee /proc/sys/net/ipv4/conf/*/send_redirects
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You may also want to consider enabling this permanently in ``/etc/sysctl.conf``
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as demonstrated `here <https://unix.stackexchange.com/a/58081>`_.
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4. Create an iptables ruleset that redirects the desired traffic to the
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mitmproxy port. Details will differ according to your setup, but the
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ruleset should look something like this:
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.. code-block:: none
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iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8080
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iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 443 -j REDIRECT --to-port 8080
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5. Fire up mitmproxy. You probably want a command like this:
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>>> mitmproxy -T --host
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The ``-T`` flag turns on transparent mode, and the ``--host``
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argument tells mitmproxy to use the value of the Host header for URL display.
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6. Finally, configure your test device to use the host on which mitmproxy is
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running as the default gateway.
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For a detailed walkthrough, have a look at the :ref:`transparent-dhcp` tutorial.
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