How To Use mitmproxy to read and modify HTTPS traffic. Capturing HTTP and HTTPS traffic on your own machine is quite simple Using tools like Wireshark or Firebug, sniffing the local connections is only a matter of seconds. Capturing andor altering the HTTPHTTPS traffic of other machines in your network such as your smartphone or other laptops on the other hand is not so easy. Especially sniffing into SSL secured HTTPS connections seems impossible at first. Using mitmproxy, however, makes this possible in a very easy and straight forward way. This small tutorial shows how to use mitmproxy to transparently sniff into and alter HTTPS connections of your phone or other devices in your network. Contents. 1. How it works. Mitmproxy is an open source proxy application that allows intercepting HTTP and HTTPS connections between any HTTPS client such as a mobile or desktop browser and a web server using a typical man in the middle attack MITM. Similar to other proxies such as Squid, it accepts connections from clients and forwards them to the destination server. However, while other proxies typically focus on content filtering or speed optimization through caching, the goal of mitmproxy is to let an attacker monitor, capture and alter these connections in realtime. Attacking HTTP connections. For unencrypted HTTP connections, this is quite simple mitmproxy accepts a connection from the HTTP client, say a mobile browser, displays the request and its request parameters to the attacker on the screen, and forwards the request to the destination web server as soon as the attacker confirms maybe after adjusting the request payload a bit. To the client, it looks like as if the mitmproxy server was simply relaying its connection like your router or your ISPs servers do. And to the server, it looks like the mitmproxy server is the client. Attacking HTTPS connections. While attacking unencrypted HTTP traffic can be done without having to deal with X. CA, SSL encrypted HTTPS connections encrypt every request and response between client and server end to end. And because the transferred data is encrypted with a shared secret, a middle man or a proxy cannot decipher the exchanged data packets. When the client opens an SSLTLS connection to the secure web server, it verifies the servers identity by checking two conditions First, it checks whether its certificate was signed by a CA known to the client. And second, it makes sure that the common name CN, also host name of the server matches the one it connects to. If both conditions are true, the client assumes the connection is secure. In order to be able to sniff into the connection, mitmproxy acts as a certificate authority, however, not a very trustworthy one Instead of issuing certificates to actual persons or organizations, mitmproxy dynamically generates certificates to whatever hostname is needed for a connection. If, for instance, a client wants to connect to https www. Check If Setuptools Is Installed InfantCA. Provided that the client trusts this CA, both of the above mentioned conditions are true trusted CA, same CN meaning that the client believes that the mitmproxy server is in fact www. The figure below shows the requestresponse flow for this scenario. This mechanism is called transparent HTTPS proxying. For this attack to work, there are a few conditions that must be met Mitmproxy as standard gateway HTTP and HTTPS For both HTTP and HTTPS proxying, the server running mitmproxy must of course be able to intercept the IP packets meaning that it must be somewhere along the way of the packet path. The easiest way to achieve this is to change the default gateway in the client device to the mitmproxy server address. Trusted mitmproxy CA HTTPS only For the HTTPS proxying to work, the client must know and trust the mitmproxy CA, i. CA key file must be added to the trust store of the client. More Details. In case that description is not detailed enough for you There is a wonderful explanation of how mitmproxy works and its different modes of mitmproxy on the official website of the project. Install run mitmproxy. After this little theory session, lets get down to business. InternetInstalling With Setuptools If the Python interpreter youre using has Setuptools installed, and the system has internet access, you can download and. The official home of the Python Programming Language. How to build lxml from source. To build lxml from source, you need libxml2 and libxslt properly installed, including the header files. These are likely shipped in. Install mitmproxy. The installation of mitmproxy is very simple, because its been packaged using the Python package management system pip. Other mitmproxy dependencies can be installed with apt get. Install mitmproxy CA certificate in the phone. Next, you need to install the mitmproxy generated CA certificate in the device for which you want to capturealter the HTTPS connection. This can be a desktop browser, or a mobile phone Android, i. OS,. The mitmproxy documentation has a good section that tells you how to do this. Heres a short summary for Android Upload the certificate located at. Downloadmitmproxy ca cert. Android device. Go to Settings, Security and click Install from device storageEnter mitmproxy ca cert no suffix and click OKNow click on Trusted credentials and select the User tab. The certificate should now appear in the list. Enable IP forwarding and port redirection. The mitmproxy application internally runs on TCP port 8. HTTP and 4. 43HTTPS. Therefore, a IP forwarding in general the system must act as a router and a redirection from 8. IP packets. The nat table of iptables can be used to do that pretty easily. This is also described in the Linux section of the mitmproxy manual. A PREROUTING i eth. REDIRECT to port 8. A PREROUTING i eth. REDIRECT to port 8. APREROUTING ieth. REDIRECT to port. APREROUTING ieth. REDIRECT to port. Its not clear to me why the application does not simply bind to the ports 8. Start mitmproxy. As mentioned above, mitmproxy runs on port 8. So simply stop anything that might be blocking those ports Apache web server, Tomcat, Glassfish, etc. If youre unsure, check out netstat ntap. Important side note mitmproxy has the option p, which allows you to choose a different port than 8. This option did not work for me when I tried it. While it did listen on the given port, no requests were intercepted. The display just stayed blank. It unfortunately cost me three hours to find that out. To actually start mitmproxy, simply run this command. T host. Youll see a blank black screen with a blue bar on the bottom and nothing will happen because your phone or browser does not yet communicate via mitmproxy. Familiarize yourself with the UI, read the docs on the official site, and check out the help page by typing Change the standard gateway of the phone. To be able to sniff into your phones or browsers HTTPHTTPS connections, you need to change the standard gateway to the IP address of the mitmproxy server. You can do this on Android like shown below Go to Settings, Wi Fi and long press on your connected network. Choose Modify network config. Check Show advanced options, set IP settings to Static and manually change the gateway address to the mitmproxy server address. Click Save. 2. 6. Capture and alter HTTPHTTPS requests and responses. After youve changed the settings, start interacting with the device go to facebook. Whats. App status, open your browser. If everything works, you should see lots of HTTP and HTTPS requests on the mitmproxy screen. You can navigate up and down using your arrow keys. Press the return key to look at a request in more detail if you like. As youll notice, right now, you do not have the chance to alter any request. The Homebrew package manager for Linux. Linuxbrew is a fork of Homebrew, the mac. OS package manager, for Linux. It can be installed in your home directory and does not require root access. The same package manager can be used on both your Linux server and your Mac laptop. Installing a modern version of glibc and gcc in your home directory on an old distribution of Linux takes five minutes. Features, usage and installation instructions are summarised on the homepage. Terminology e. g. Cellar, Tap, Cask and so forth is explained here. To receive updates of major changes to Linuxbrew subscribe to the Linuxbrew Updates issue on Git. Hub. Install Linuxbrew. 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