Hi, I’m Matthew Shao from China. This year, I got the honor to be selected as a Google Summer of Code student for the mitmproxy project. With the help of my kindly mentors Maximilian Hils and Clemens Brunner, I managed to improve the source code of mitmweb, which is a web interface for mitmproxy, and added some exciting new features for it. Here I’m going to present you the work I’ve done during this fulfilling summer.
Test Coverage for mitmproxy before and after the first month. You can see the
web/ directory at the bottom right.
Jest test suite here, whose flexible mocking function and snapshot feature help a lot. But as you can see, we are not at 100% yet, and there are still some tricky code paths which require more patience to cover.
Mitmproxy’s new options editor implemented by Aldo Cortesi gives us more flexibility on modifying the all kinds of settings, including the extra options brought by the customized scripts and addons. During the second coding period in GSoC, I made this new feature adapt to the Web Interface.
As the first step, with the help of Maximilian, I ported the options editor to the RESTful API. This part is coded in Python (#2395).
Our current implementation does live-editing, the front-end always listens on any changes and tries to update the options to the back-end almost immediately. This works great for the majority of options, although some options (i.e. the
cadir and other file-related ones) need more digging to support live-editing in mitmweb. We created an issue to trace the usability of all the options in mitmweb and also opened a collaborative spreadsheet for that (#2451).
This feature, I personally consider it as the most challenging as well as the most exciting one during my GSoC trip. Mitmweb allows users to save all captured flows into a single
flows file, and there are many cases we need to share captured flows to others. For now, everyone needs to install mitmproxy to view captured flows. The new static viewer changes that: The
flows file can be converted to a set of static HTML/CSS/JS files, which provide an instant interface to view captured flows in any web browser. We are currently finishing a cloud service where users can upload a mitmproxy flow file and then get a publicly shareable URL for their captured session. You can view a demo here: //share.mitmproxy.org/honeynet-demo/!
The sharing process goes like this:
First, we had a discussion about which components in the web interface should be eliminated in static mode. I set a global variable to tell whether we are in static mode or not, and hide the redundant components in static mode according to the variable (#2504). This was a bit tricky as we needed to upgrade to the latest React beta version. Second, I implemented a converter addon to copy all the static files (in
.js) to the destination and generated the json files which contain all the captured information (#2510). Third, @mhils and I started to work on the share.mitmproxy.org code, which can be found at //github.com/mitmproxy/share.mitmproxy.org.
Redux.js, especially about how to write reliable tests for the Web UI.
I enjoy coding cool stuff with my dear mentors very much. Thanks for the countless helpful suggestions and great patience from them. Thanks to Google to provide me with this invaluable chance to work with a famous open source community with awesome members from all over the world. I really appreciate this experience and I believe it will have profound impact on my career.