The built-in wifi radio on a Raspberry Pi 4 is kind of sad, as it does not support monitor mode. Luckily the hackers at Seemo Labs have fixed this.
In this post we'll describe how to load Seemoo's Nexmon onto a pi4 running a modern kernel, and package it into a SPR Plugin named spr-nexmon. We'll demonstrate that packet capture and injection works.
SPR lets users create adaptive, micro-segmented networks for connecting and managing devices. In addition to fine-grained network visibility we also build hardened software and work to avoid common security flaws. As SPR has matured we've started taking on further efforts to eliminate attack surfaces.
When it comes to native code: we introduce none. As in, we have not written new native code for SPR anywhere. We have one BPF filter, and its otherwise golang all the way down. We also do not run standard native services where we can avoid them. We have replaced traditional C code for services such as DNS and DHCP with golang implementations, namely CoreDNS and CoreDHCP.
The remaining native code targets that we have in SPR are as follows:
We've published barely an implementation of a WiFi 802.11 Access Point, using Scapy to teach people about WiFi authentication.