mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-12-02 12:01:17 +00:00
104 lines
4.5 KiB
HTML
104 lines
4.5 KiB
HTML
|
|
The proxy situation on Android is [an
|
|
embarrasment](http://code.google.com/p/android/issues/detail?id=1273). It's
|
|
scarcely credible, but Android didn't have a global proxy setting at all until
|
|
quite recently, and it's still not supported on many common Android versions.
|
|
In the meantime the app ecosystem has grown used to life without this basic
|
|
necessity, and many apps merrily ignore it even if it's there. The upshot is
|
|
that in many cases the only way to make interception work on Android is to do
|
|
it without relying on the proxy settings.
|
|
|
|
We used an Asus Transformer Prime TF201 with Android 4.0.3 in the examples
|
|
below - your device may differ, but the broad process should be similar.
|
|
|
|
|
|
Installing the mitmproxy certificate
|
|
====================================
|
|
|
|
The first step is to install mitmproxy's interception certificate on the
|
|
Android device. In your ~/.mitmproxy directory, there should be a file called
|
|
__mitmproxy-ca-cert.cer__ - we need to transfer this file to
|
|
__/sdcard/Downloads__ on the Android device. If this file doesn't exist for
|
|
you, your certs were generated with an older version of mitmproxy - just copy
|
|
the __mitmproxy-ca-cert.pem__ file to __mitmproxy-ca-cert.cer__ and proceed
|
|
from there.
|
|
|
|
In this case, we're using wget from Better Terminal Emulator Pro to transfer
|
|
the certificate from a local HTTP server. Other terminal applications may work,
|
|
and you might also transfer the file via external media like an SDcard:
|
|
|
|
<img src="android-shellwgetmitmproxyca.png"/>
|
|
|
|
Once we have the certificate on the local disk, we need to import it into the
|
|
list of trusted CAs. Go to Settings -> Security -> Credential Storage,
|
|
and select "Install from storage":
|
|
|
|
<img src="android-settingssecuritymenu.png"/>
|
|
|
|
The certificate in /sdcard/Downloads is automatically located and offered for
|
|
installation. Installing the cert will delete the download file from the local
|
|
disk:
|
|
|
|
<img src="android-settingssecurityinstallca.png"/>
|
|
|
|
Afterwards, you should see the certificate listed in the Trusted Credentials
|
|
store:
|
|
|
|
<img src="android-settingssecurityuserinstalledca.png"/>
|
|
|
|
If you're lucky enough to be working with an app that obeys the wireless proxy
|
|
settings, you're just about done - simply configure the settings to point at
|
|
mitmproxy. If not, proceed to the next step...
|
|
|
|
|
|
Working around Android's proxy shortcomings
|
|
===========================================
|
|
|
|
In response to Android's proxy situation, a number of apps have been created to
|
|
duct-tape proxy support onto the OS. These tools work by running a rudimentary
|
|
local proxy on the device, and forwarding all traffic destined for HTTP/S ports
|
|
to it using iptables. Since the proxy is running locally, it can detect what
|
|
the final IP address of the redirected traffic would have been. The local proxy
|
|
then connects to a user-configured upstream proxy, and initiates a proxy
|
|
CONNECT request to the destination IP.
|
|
|
|
Now, if the configured upstream proxy is mitmproxy, we have a slight problem.
|
|
Proxy requests from the Android device in this scheme will specify only the
|
|
destination IP address, __not__ the destination domain. Mitmproxy needs the
|
|
target domain to generate a valid interception certificate. The solution is
|
|
mitmproxy's [upstream certificate](@!urlTo("upstreamcerts.html")!@) option.
|
|
When this is active, mitmproxy makes a connection to the upstream server to
|
|
obtain the certificate Common Name and Subject Alternative Names.
|
|
|
|
Adding all this together, we can achieve reliable Android interception with
|
|
only a few more minutes of setup. The instructions below show how to set up an
|
|
Android device with
|
|
[ProxyDroid](https://play.google.com/store/apps/details?id=org.proxydroid) (the
|
|
local "duct-tape" proxy implementation) to achieve interception.
|
|
|
|
Install ProxyDroid
|
|
------------------
|
|
|
|
First, root your device - this is required to install ProxyDroid. Then install
|
|
ProxyDroid from the Google Play store:
|
|
|
|
<img src="android-proxydroidinstall.png"/>
|
|
|
|
You will be prompted for super-user access, which you must allow. Next, enter
|
|
the ProxyDroid settings, and change the proxy settings to point to your
|
|
mitmproxy instance. When you're done, it should look something like this:
|
|
|
|
<img src="android-proxydroidsettings.png"/>
|
|
|
|
In this case, our mitmproxy instance is at the host __maru.otago.ac.nz__,
|
|
running on port __8080__.
|
|
|
|
When you start mitmproxy, make sure that the upstream certificate option is set
|
|
(use the _--upstream-cert_ command-line option, or enable it interactively
|
|
using the _o_ shortcut):
|
|
|
|
<pre class="terminal">
|
|
mitmproxy --upstream-cert
|
|
</pre>
|
|
|