mirror of
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improve transparent mode docs
This commit is contained in:
Maximilian Hils
parent
252684e14e
commit
9748487939
@ -27,7 +27,209 @@ At the moment, mitmproxy supports transparent proxying on OSX Lion and above,
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and all current flavors of Linux.
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## Linux fully transparent mode
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## Linux
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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. Enable IP forwarding.
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{{< highlight bash >}}
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sysctl -w net.ipv4.ip_forward=1
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sysctl -w net.ipv6.conf.all.forwarding=1
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{{< / highlight >}}
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This makes sure that your machine forwards packets instead of rejecting them.
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If you want to persist this across reboots, you need to adjust your `/etc/sysctl.conf` or
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a newly created `/etc/sysctl.d/mitmproxy.conf` (see [here](https://superuser.com/a/625852)).
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### 2. Disable ICMP redirects.
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{{< highlight bash >}}
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sysctl -w net.ipv4.conf.all.send_redirects=0
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{{< / highlight >}}
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If your test device is on the same physical network, your machine shouldn't inform the device that
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there's a shorter route available by skipping the proxy.
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If you want to persist this across reboots, see above.
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### 3. Create an iptables ruleset that redirects the desired traffic to mitmproxy.
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Details will differ according to your setup, but the ruleset should look
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something like this:
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{{< highlight bash >}}
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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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ip6tables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8080
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ip6tables -t nat -A PREROUTING -i eth0 -p tcp --dport 443 -j REDIRECT --to-port 8080
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{{< / highlight >}}
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If you want to persist this across reboots, you can use the `iptables-persistent` package (see
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[here](http://www.microhowto.info/howto/make_the_configuration_of_iptables_persistent_on_debian.html)).
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### 4. Fire up mitmproxy.
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You probably want a command like this:
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{{< highlight bash >}}
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mitmproxy --mode transparent --showhost
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{{< / highlight >}}
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The `--mode transparent` option turns on transparent mode, and the `--showhost` argument tells
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mitmproxy to use the value of the Host header for URL display.
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### 5. Finally, configure your test device.
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Set the test device up to use the host on which mitmproxy is running as the default gateway and
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[install the mitmproxy certificate authority on the test device]({{< relref "concepts-certificates" >}}).
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## OpenBSD
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### 1. Enable IP forwarding.
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{{< highlight bash >}}
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sudo sysctl -w net.inet.ip.forwarding=1
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{{< / highlight >}}
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### 2. Place the following two lines in **/etc/pf.conf**.
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{{< highlight none >}}
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mitm_if = "re2"
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pass in quick proto tcp from $mitm_if to port { 80, 443 } divert-to 127.0.0.1 port 8080
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{{< / highlight >}}
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These rules tell pf to divert all traffic from `$mitm_if` destined for port 80
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or 443 to the local mitmproxy instance running on port 8080. You should replace
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`$mitm_if` value with the interface on which your test device will appear.
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### 3. Configure pf with the rules.
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{{< highlight bash >}}
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doas pfctl -f /etc/pf.conf
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{{< / highlight >}}
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### 4. And now enable it.
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{{< highlight bash >}}
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doas pfctl -e
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{{< / highlight >}}
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### 5. Fire up mitmproxy.
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You probably want a command like this:
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{{< highlight bash >}}
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mitmproxy --mode transparent --showhost
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{{< / highlight >}}
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The `--mode transparent` option turns on transparent mode, and the `--showhost` argument tells
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mitmproxy to use the value of the Host header for URL display.
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### 6. Finally, configure your test device.
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Set the test device up to use the host on which mitmproxy is running as the default gateway and
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[install the mitmproxy certificate authority on the test device]({{< relref "concepts-certificates" >}}).
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{{% note %}}
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Note that the **divert-to** rules in the pf.conf given above only apply
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to inbound traffic. **This means that they will NOT redirect traffic
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coming from the box running pf itself.** We can't distinguish between an
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outbound connection from a non-mitmproxy app, and an outbound connection
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from mitmproxy itself - if you want to intercept your traffic, you
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should use an external host to run mitmproxy. Nonetheless, pf is
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flexible to cater for a range of creative possibilities, like
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intercepting traffic emanating from VMs. See the **pf.conf** man page
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for more.
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{{% /note %}}
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## macOS
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OSX Lion integrated the [pf](https://en.wikipedia.org/wiki/PF_(firewall))
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packet filter from the OpenBSD project, which mitmproxy uses to implement
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transparent mode on OSX. Note that this means we don't support transparent mode
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for earlier versions of OSX.
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### 1. Enable IP forwarding.
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{{< highlight bash >}}
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sudo sysctl -w net.inet.ip.forwarding=1
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{{< / highlight >}}
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### 2. Place the following two lines in a file called, say, **pf.conf**.
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{{< highlight none >}}
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rdr on en0 inet proto tcp to any port {80, 443} -> 127.0.0.1 port 8080
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{{< / highlight >}}
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These rules tell pf to redirect all traffic destined for port 80 or 443
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to the local mitmproxy instance running on port 8080. You should replace
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`en2` with the interface on which your test device will appear.
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### 3. Configure pf with the rules.
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{{< highlight bash >}}
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sudo pfctl -f pf.conf
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{{< / highlight >}}
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### 4. And now enable it.
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{{< highlight bash >}}
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sudo pfctl -e
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{{< / highlight >}}
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### 5. Configure sudoers to allow mitmproxy to access pfctl.
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Edit the file **/etc/sudoers** on your system as root. Add the following line to
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the end of the file:
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{{< highlight none >}}
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ALL ALL=NOPASSWD: /sbin/pfctl -s state
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{{< / highlight >}}
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Note that this allows any user on the system to run the command `/sbin/pfctl -s
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state` as root without a password. This only allows inspection of the state
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table, so should not be an undue security risk. If you're special feel free to
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tighten the restriction up to the user running mitmproxy.
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### 6. Fire up mitmproxy.
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You probably want a command like this:
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{{< highlight bash >}}
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mitmproxy --mode transparent --showhost
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{{< / highlight >}}
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The `--mode transparent` flag turns on transparent mode, and the `--showhost` argument tells
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mitmproxy to use the value of the Host header for URL display.
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### 7. Finally, configure your test device.
|
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|
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Set the test device up to use the host on which mitmproxy is running as the default gateway and
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[install the mitmproxy certificate authority on the test device]({{< relref "concepts-certificates" >}}).
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{{% note %}}
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Note that the **rdr** rules in the pf.conf given above only apply to
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inbound traffic. **This means that they will NOT redirect traffic coming
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from the box running pf itself.** We can't distinguish between an
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outbound connection from a non-mitmproxy app, and an outbound connection
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from mitmproxy itself - if you want to intercept your OSX traffic, you
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should use an external host to run mitmproxy. Nonetheless, pf is
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flexible to cater for a range of creative possibilities, like
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intercepting traffic emanating from VMs. See the **pf.conf** man page
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for more.
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{{% /note %}}
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## "Full" transparent mode on Linux
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By default mitmproxy will use its own local IP address for its server-side
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connections. In case this isn't desired, the --spoof-source-address argument can
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@ -60,210 +262,3 @@ sudo chown root:root mitmproxy_shim
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sudo chmod u+s mitmproxy_shim
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./mitmproxy_shim $(which mitmproxy) --mode transparent --set spoof-source-address
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{{< / highlight >}}
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## Linux
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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. [Install the mitmproxy certificate on the test device]({{< relref "concepts-certificates" >}})
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### 2. Enable IP forwarding:
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{{< highlight bash >}}
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sysctl -w net.ipv4.ip_forward=1
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sysctl -w net.ipv6.conf.all.forwarding=1
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{{< / highlight >}}
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You may also want to consider enabling this permanently in `/etc/sysctl.conf` or
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newly created `/etc/sysctl.d/mitmproxy.conf`, see
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[here](https://superuser.com/a/625852).
|
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### 3. If your target machine is on the same physical network and you configured it to use a custom gateway, disable ICMP redirects:
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{{< highlight bash >}}
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sysctl -w net.ipv4.conf.all.send_redirects=0
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{{< / highlight >}}
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You may also want to consider enabling this permanently in `/etc/sysctl.conf` or
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a newly created `/etc/sysctl.d/mitmproxy.conf`, see
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[here](https://superuser.com/a/625852).
|
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### 4. Create an iptables ruleset that redirects the desired traffic to the mitmproxy port
|
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|
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Details will differ according to your setup, but the ruleset should look
|
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something like this:
|
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|
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{{< highlight bash >}}
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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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ip6tables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8080
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ip6tables -t nat -A PREROUTING -i eth0 -p tcp --dport 443 -j REDIRECT --to-port 8080
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{{< / highlight >}}
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You may also want to consider enabling this permanently with the
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`iptables-persistent` package, see
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[here](http://www.microhowto.info/howto/make_the_configuration_of_iptables_persistent_on_debian.html).
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### 5. Fire up mitmproxy
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|
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You probably want a command like this:
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|
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{{< highlight bash >}}
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mitmproxy --mode transparent --showhost
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{{< / highlight >}}
|
||||
|
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The `--mode transparent` option turns on transparent mode, and the `--showhost` argument tells
|
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mitmproxy to use the value of the Host header for URL display.
|
||||
|
||||
### 6. Finally, configure your test device
|
||||
|
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Set the test device up to use the host on which mitmproxy is running as the
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default gateway. For a detailed walkthrough, have a look at the [tutorial for
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transparently proxying VMs]({{< relref "howto-transparent-vms" >}}).
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## OpenBSD
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### 1 [Install the mitmproxy certificate on the test device]({{< relref "concepts-certificates" >}})
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### 2. Enable IP forwarding
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{{< highlight bash >}}
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sudo sysctl -w net.inet.ip.forwarding=1
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{{< / highlight >}}
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### 3. Place the following two lines in **/etc/pf.conf**
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|
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{{< highlight none >}}
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mitm_if = "re2"
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pass in quick proto tcp from $mitm_if to port { 80, 443 } divert-to 127.0.0.1 port 8080
|
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{{< / highlight >}}
|
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|
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These rules tell pf to divert all traffic from `$mitm_if` destined for port 80
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or 443 to the local mitmproxy instance running on port 8080. You should replace
|
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`$mitm_if` value with the interface on which your test device will appear.
|
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### 4. Enable the pf ruleset and enable it
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{{< highlight bash >}}
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doas pfctl -f /etc/pf.conf
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{{< / highlight >}}
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And now enable it:
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{{< highlight bash >}}
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doas pfctl -e
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{{< / highlight >}}
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### 5. Fire up mitmproxy
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You probably want a command like this:
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|
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{{< highlight bash >}}
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mitmproxy --mode transparent --showhost
|
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{{< / highlight >}}
|
||||
|
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The `--mode transparent` option turns on transparent mode, and the `--showhost` argument tells
|
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mitmproxy to use the value of the Host header for URL display.
|
||||
|
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### 6. Finally, configure your test device
|
||||
|
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Set the test device up to use the host on which mitmproxy is running as the
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default gateway.
|
||||
|
||||
|
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{{% note %}}
|
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Note that the **divert-to** rules in the pf.conf given above only apply
|
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to inbound traffic. **This means that they will NOT redirect traffic
|
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coming from the box running pf itself.** We can't distinguish between an
|
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outbound connection from a non-mitmproxy app, and an outbound connection
|
||||
from mitmproxy itself - if you want to intercept your traffic, you
|
||||
should use an external host to run mitmproxy. Nonetheless, pf is
|
||||
flexible to cater for a range of creative possibilities, like
|
||||
intercepting traffic emanating from VMs. See the **pf.conf** man page
|
||||
for more.
|
||||
{{% /note %}}
|
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|
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## macOS
|
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|
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OSX Lion integrated the [pf](https://en.wikipedia.org/wiki/PF_(firewall))
|
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packet filter from the OpenBSD project, which mitmproxy uses to implement
|
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transparent mode on OSX. Note that this means we don't support transparent mode
|
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for earlier versions of OSX.
|
||||
|
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### 1. [Install the mitmproxy certificate on the test device]({{< relref "concepts-certificates" >}})
|
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|
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### 2. Enable IP forwarding
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|
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{{< highlight bash >}}
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sudo sysctl -w net.inet.ip.forwarding=1
|
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{{< / highlight >}}
|
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### 3. Place the following two lines in a file called, say, **pf.conf**
|
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|
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|
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{{< highlight none >}}
|
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rdr on en0 inet proto tcp to any port {80, 443} -> 127.0.0.1 port 8080
|
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{{< / highlight >}}
|
||||
|
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These rules tell pf to redirect all traffic destined for port 80 or 443
|
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to the local mitmproxy instance running on port 8080. You should replace
|
||||
`en2` with the interface on which your test device will appear.
|
||||
|
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### 4. Configure pf with the rules
|
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|
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{{< highlight bash >}}
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sudo pfctl -f pf.conf
|
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{{< / highlight >}}
|
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### 5. And now enable it
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|
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{{< highlight bash >}}
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sudo pfctl -e
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{{< / highlight >}}
|
||||
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### 6. Configure sudoers to allow mitmproxy to access pfctl
|
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|
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Edit the file **/etc/sudoers** on your system as root. Add the following line to
|
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the end of the file:
|
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|
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{{< highlight none >}}
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ALL ALL=NOPASSWD: /sbin/pfctl -s state
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{{< / highlight >}}
|
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|
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Note that this allows any user on the system to run the command `/sbin/pfctl -s
|
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state` as root without a password. This only allows inspection of the state
|
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table, so should not be an undue security risk. If you're special feel free to
|
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tighten the restriction up to the user running mitmproxy.
|
||||
|
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### 7. Fire up mitmproxy
|
||||
|
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You probably want a command like this:
|
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|
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{{< highlight bash >}}
|
||||
mitmproxy --mode transparent --showhost
|
||||
{{< / highlight >}}
|
||||
|
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The `--mode transparent` flag turns on transparent mode, and the `--showhost` argument tells
|
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mitmproxy to use the value of the Host header for URL display.
|
||||
|
||||
### 6. Finally, configure your test device
|
||||
|
||||
Set the test device up to use the host on which mitmproxy is running as the
|
||||
default gateway.
|
||||
|
||||
{{% note %}}
|
||||
Note that the **rdr** rules in the pf.conf given above only apply to
|
||||
inbound traffic. **This means that they will NOT redirect traffic coming
|
||||
from the box running pf itself.** We can't distinguish between an
|
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outbound connection from a non-mitmproxy app, and an outbound connection
|
||||
from mitmproxy itself - if you want to intercept your OSX traffic, you
|
||||
should use an external host to run mitmproxy. Nonetheless, pf is
|
||||
flexible to cater for a range of creative possibilities, like
|
||||
intercepting traffic emanating from VMs. See the **pf.conf** man page
|
||||
for more.
|
||||
{{% /note %}}
|
||||
|
||||
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