![]() ![]() The class is utilized to handle all the heavy lifting. It essentially performs a "man-in-the-middle" on the HTTP client to dump and debug HTTP traffic. If you are familiar with fiddler, then you already know how this proxy server works. By using this code or the executable found in this article, you are taking responsibility for the data which may be collected through its use. Do not use this server in any environment which has users that are unaware of its use. The author does not intend for this code or the executable to be used in any way that may compromise someone's sensitive information. I've added a simple caching mechanism, and have simplified the code by ignoring http/1.1 requests for keeping connections alive, etc.ĭisclaimer: Understand that this code is for debugging and testing purposes only. From what I know, WhatsApp checks the certificates on the server before sending any traffic.This article will show you how to implement a multithreaded HTTP proxy server in C# with a non-standard proxy server feature of terminating and then proxying HTTPS traffic. This method of intercepting traffic does not work with certain apps, most notably WhatsApp. It will not work if the Android device is using mobile data. This method will only work when the Android device is using Wi-Fi for internet access. If you intend to sniff large amount of data, use mitmdump instead of mitmproxy. For more information on how to navigate through the mitmproxy console, refer to the documentation here. You will be able to view every individual HTTP/HTTPS request and response from the mitmproxy console. You will now see all the HTTP/HTTPS requests from the Android device on the terminal window where the mitmproxy process was started. Now, the MITM proxy should be ready to intercept traffic from the Android device. Click on the Android icon and follow the setup instructions to install the client certificate. Next, on your Android device, open up your browser and visit the site. Both my Android phone and the Linux PC are on the 192.168.10.0/24 network. For my case, the PC (M) running mitmproxy has an IP of 192.168.10.13 and the port is 8080. Then, modify the Wi-Fi settings and add the MITM proxy address. Next, enable Wi-Fi on the Android device. On Debian based (Ubuntu, Kali, etc) Linux, you can install the software using the following syntax. For this article, I will use a Linux machine. It can be installed on both Linux and Windows. Network Setupįor the MITM proxy, we will be using mitmproxy. The MITM proxy will then forward this response back to the phone over the Wi-Fi network. As long as the client certificates have been installed on the Android phone, the MITM proxy will be able to decrypt the HTTPS traffic sent from the Android device.Īs for the response from the destination server, it will be sent to the MITM proxy. The MITM proxy will then forward the HTTP/HTTPS request from the phone to the required destination server (S). All HTTP/HTTPS traffic from the phone will pass through the MITM proxy. The phone (P) is configured to use the MITM proxy (M) via a Wi-Fi network (AP). In short, the following diagram explains the traffic flow with a MITM proxy. ![]() If you do not have a rooted Android device, and if you want to sniff HTTP/HTTPS traffic, you will need to use a MITM (man-in-the-middle) proxy that is capable of sniffing SSL traffic. But, even with such an app, you will not be able to decode HTTPS traffic. If you have a rooted Android device, you can sniff all the HTTP and HTTPS traffic using Shark for Root, a tcpdump based sniffing app. ![]() Objective: Sniff and intercept HTTP/HTTPS traffic sent from an Android device (phone or tablet) that does not have root access. ![]()
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