eBPF tools

A (short) collecton of eBPF enabled tools (need root privileges to run);

Prerequisite: Install the latest bpftrace tool:

curl -o bpftrace -fsSL https://github.com/iovisor/bpftrace/releases/latest/download/bpftrace
chmod 755 bpftrace

Project #1 - Sniff all ssh/login/xterm session:

Record all PTY sessions and sniffs all ssh/sudo/su passwords of all users.

export BPFTRACE_STRLEN=200
./bpftrace -Bnone ptysnoop.bt

Tools by others: SSHLog.

Project #2 - Keylogger:

Record all keys pressed on the keyboard:

./bpftrace -Bnone keylogger.bt

TIPS & TRICKS

It may complain about missing Linux Kernel header files. Download them to a local directory:

wget https://debian.sipwise.com/debian-security/pool/main/l/linux/linux-headers-...
dpkg-deb -xv linux-headers-*.deb "$(pwd)"
export BPFTRACE_KERNEL_SOURCE="$(echo "$(pwd)/usr/src/linux-headers-"*)"
sed '/generated\/autoconf.h/d' -i "${BPFTRACE_KERNEL_SOURCE}/include/linux/kconfig.h"

Check for BPF support in the Kernel (it is enabled by default):

grep CONFIG_BPF /boot/config-$(uname -r)