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Linux Directories

  • /usr/bin managed by package manager
  • /usr/local/bin managed by user

Config Files Default Locations

  • Apache config /etc/apach2/sites-enabled/000-default.conf
  • gitlab rails /opt/gitlab/embedded/service/gitlab-rails/config/secrets.yml
  • AWS ~/. aws/config

Share VPN Connection between 2 VMs

On The Linux VM with the openvpn connection

# Enable IP Forwarding
echo 1 > /proc/sys/net/ipv4/ip_forward

# Forward Connection
iptables -A FORWARD -i tun0 -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i eth0 -o tun0 -j ACCEPT

# Add NAT
iptables -t nat -A POSTROUTING -s -o tun0 -j MASQUERADE

On The windows vm

# Add new route
route add mask <router_ip>

References: Networking VMs for HTB | 0xdf hacks stuff Ippsec - HTB Sharp

Log Incoming connections to file

# Setup Logging rule
iptables -A INPUT -p tcp -m state --state NEW -j LOG --log-prefix "IP Tables New-Connection: " -i tun0

# Confirm rule was added
iptables -L

# Check Log file for the connections
grep -i iptables /etc/log/messages 

Useful terminal tricks

Pipe to clipboard

# Install package via npm
npm install -g clipboard-cli

# pipe output to clipboard
echo foo | clipboard 

# Via xsel
ls | xsel -ib

# Via xclip
ls | xclip -sel clip

# Pipe clipboard to file using xclip
xclip -selection clipboard -o > clipboard.txt


# Allow python to bind to privileged ports
sudo setcap  cap_net_bind_service+eip  $(which python3.9)

# Check Capabilities
getcap $(which python3)

# or
stat $(which python3)

Debian Packages

ar x mypackage.deb

Grab IP From file system

cat /proc/net/fib_trie

Decompress & Extract

unzip -d arc

tar xvf arc.tar 

gzip -d arc.gz

Bash Tricks

# Pipe stderr to stdout
curl 2>&1