Sergio Oller zeehio

PostgreSQL is Enough

Background and Cron Jobs

Iptables(8) TARPIT is a useful security mechanism that can slow down or stop attacks on a network. If everyone used TARPIT to block attackers, in theory their resources would be exhausted as their connection attempts would be delayed, which would discouraged people from attempting unauthorized access. Here's a brief description of how TARPIT works:

To achieve this tar pit state, iptables accepts the incoming TCP/IP connection and then switches to a zero-byte window. This forces the attacker's system to stop sending data, rather like the effect of pressing Ctrl-S on a terminal. Any attempts by the attacker to close the connection are ignored, so the connection remains active and typically times out after only 12–24 minutes. This consumes resources on the attacker's system but not

Wireguard and iptables restrictions for multiple users

If you don't know what Wireguard is, well, you should. It's fast, easy to setup and highly configurable. We will configure Wireguard for multiple users with various restrictions using iptables.

Assumptions

This should fit most setups (not mine though 😉)

Sample service script for debianoids

Look at LSB init scripts for more information.

Usage

Copy to /etc/init.d:

# replace "$YOUR_SERVICE_NAME" with your service's name (whenever it's not enough obvious)

	inner_fn <- function() {
	cat("-- Entering Inner Function --\n")
	# This step of the body is targeted by `at = 3L` in `trace()`
	cat("-- Exiting Inner Function --\n")
	return("inner_fn")
	}

	outer_fn <- function() {
	cat("---- Entering Outer Function ----\n")
	x <- inner_fn()

	# Animated dplyr joins with gganimate
	# * Garrick Aden-Buie
	# * garrickadenbuie.com
	# * MIT License: https://opensource.org/licenses/MIT

	# Note: I used Fira Sans and Fira Mono fonts.
	# Use search and replace to use a different font if Fira is not available.

	library(tidyverse)
	library(gganimate)

	/*
	* I add this to html files generated with pandoc.
	*/

	html {
	font-size: 100%;
	overflow-y: scroll;
	-webkit-text-size-adjust: 100%;
	-ms-text-size-adjust: 100%;
	}

	/*
	Copyright 2012 Gerhard R. <gerd.r.devel@googlemail.com>

	Permission is granted to use, modify, and / or redistribute at will.

	This includes removing authorship notices, re-use of code parts in
	other software (with or without giving credit), and / or creating a
	commercial product based on it.

	This permission is not revocable by the author.