jo-makar

Apt and zoom (or any custom deb)

Setup

mkdir -p /srv/apt
# copy to update-zoom.py to /srv/apt

echo 'APT::Update::Pre-Invoke {"cd /srv/apt && ./update-zoom.py && apt-ftparchive packages . >Packages && apt-ftparchive release . >Release";};' >/etc/apt/apt.conf.d/100custom
echo 'deb [trusted=yes] file:/srv/apt ./' >/etc/apt/sources.list.d/custom.list

jo-makar

Create an AWS AMI from scratch

• Create (or import) a virtual machine
  • Any hypervisor would work though KVM does not easily support exporting to an OVA
    • The challenge with KVM is not the disk conversion from qcow2 but the generation of an OVF file (TODO Investigate options)
  • Note that the virtual machine should not be EFI-based, which EC2 does not support
• Install and configure cloud-init (minimally for deploying the ssh keypair and resetting the sshd host keys)
  • Assuming a Centos / Red Hat based system:

yum -y install cloud-init

jo-makar

FROM debian:10

RUN apt-get update && \
    apt-get install -y curl gnupg2 nmap postgresql postgresql-client

# Ref: https://docs.rapid7.com/metasploit/installing-the-metasploit-framework/#installing-the-metasploit-framework-on-linux
RUN cd /root && curl -o msfinstall https://raw.githubusercontent.com/rapid7/metasploit-omnibus/master/config/templates/metasploit-framework-wrappers/msfupdate.erb && chmod +x msfinstall
RUN cd /root && ./msfinstall

# Ref: https://www.offensive-security.com/metasploit-unleashed/using-databases/

jo-makar

#!/usr/bin/env python3

import argparse, contextlib, socket, ssl

if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('--host', '-o', default='localhost')
    parser.add_argument('--port', '-p', type=int, default=4430)
    args = parser.parse_args()

jo-makar

package logger

import (
        "fmt"
        "io"
        "path"
        "runtime"
        "strings"
        "sync"
        "time"

jo-makar

Systray notifier

This is a simple project to receive D-Bus desktop notifications and display them with a systray application.

Purposefully displaying notifications only when the systray application is right-clicked, if OSD notifications is your preference there are a multitude of options available: notification-daemon, notify-osd, dunst, etc.

jo-makar

Create the modified ISO

mount -o loop debian-10.0.0-amd64-netinst.iso /mnt/loop
mkdir debian-10.0.0-amd64-netinst
shopt -s dotglob; cp -rv /mnt/loop/* debian-10.0.0-amd64-netinst/
umount /mnt/loop

dd if=debian-10.0.0-amd64-netinst.iso of=isohdpfx.bin bs=1 count=432

cp debian-10.0.0-amd64-netinst/.disk/mkisofs .

jo-makar

#!/usr/bin/env python3
# Restore/build an i3 session

import argparse, json, logging, queue, subprocess, threading

if __name__ == '__main__':
    def i3msg(args):
        cmd = ['i3-msg'] + args
        logging.info('cmd = %r', cmd)
        subprocess.check_call(cmd, stderr=subprocess.STDOUT, encoding='utf-8')

jo-makar

Read live process memory

/proc/$pid/maps describes virtual memory regions with the first column being the address range

cd /proc/$pid/mem

# Extract the start and end address for the first entry (NR==1)
eval $(awk -F'[- ]' 'NR==1 {print "s="$1" e="$2}' maps)

jo-makar

Setup a PXE boot server

Using dnsmasq (on Debian)

apt-get install dnsmasq pxelinux syslinux-common syslinux-efi

mkdir /srv/tftpboot

ln -s /usr/lib/PXELINUX/pxelinux.0 /srv/tftpboot/