s4eidhp

Requirments

• Install latest version of ARM toolchain

cd ~
wget https://developer.arm.com/-/media/Files/downloads/gnu/13.3.rel1/binrel/arm-gnu-toolchain-13.3.rel1-x86_64-arm-none-eabi.tar.xz
tar xf arm-gnu-toolchain-13.3.rel1-x86_64-arm-none-eabi.tar.xz

• Install openocd, modify its config file path and test it

sudo apt update

s4eidhp

Steps on Linux server

• download appropriate executable from github release page or build it from source using project instructions
• install ffmpeg on system to download best quality of videos (for more information see this post)
• download browser cookies using firefox or chrome extension and copy it on the server
• use --cookies flag to pass cookies file to the yt-dl

./yt-dlp --cookies cookies.txt <video_link>

s4eidhp

How to install a package on a machine which does not have internet access?

Steps

• download apt-offline .deb package file from https://packages.ubuntu.com and transfer it to offline machine

• install apt-offline

sudo dpkg -i apt-offline_<version>_all.deb

s4eidhp

How to build

• install dependencies

sudo apt install build-essential libncurses-dev bison flex libssl-dev libelf-dev fakeroot dwarves

• download latest kernel from kernel.org in tarball format and extract it

wget https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.9.9.tar.xz
tar -xf linux-6.9.9.tar.xz
rm linux-6.9.9.tar.xz

s4eidhp

GNU Debugger Megaprimer

• Find binary file info (if debug symbols exist)

info functions
info variables              # for global variables
info registers              # inspect CPU registers
info scope <scope_name>     # for local variables

s4eidhp

Assembly Language and Shellcode for x86_64

• Compilation process

hello.c -> hello.i -> hello.s -> hello.o + some other object files -> hello.exe

• Findout CPU arch

lscpu

s4eidhp

Toolchain

cd ~
git clone https://github.com/crosstool-ng/crosstool-ng.git  
cd crosstool-ng 
git checkout crosstool-ng-1.26.0        # currently latest stable version
./bootstrap
./configure --prefix=${PWD}
make
make install

s4eidhp

SSH into Windows using Key Authentication

• Install OpenSSH Server on remote machine
• Set OpenSSH Authentication Agent service & OpenSSH Server service to start automatically
• Start both services
• Edit C:\ProgramData\ssh\sshd_config file

PubKeyAuthentication      yes
PasswordAuthentication    no
# Match group admin ...
# Authorized key file ...

s4eidhp

Linux Programming Interface

CHAPTER 2

• Kernel Tasks:
  • Process Schedulling
  • Memory Managment
  • Provision of a file system
  • Creation and termination of processes
  • Access to devices
  • Networking
• Provision of a system call application programming interface (API)

s4eidhp

• Install required packages

sudo apt-get install git wget flex bison gperf python3 python3-pip python3-venv cmake \
                     ninja-build ccache libffi-dev libssl-dev dfu-util libusb-1.0-0

• Get esp-idf

git clone --recursive https://github.com/espressif/esp-idf.git