Neeraj Kanhere neerajkanhere

58 bytes of CSS to look great nearly everywhere

When making this website, i wanted a simple, reasonable way to make it look good on most displays. Not counting any minimization techniques, the following 58 bytes worked well for me:

main {
  max-width: 38rem;
  padding: 2rem;
  margin: auto;
}

Create Root CA (Done once)

Create Root Key

Attention: this is the key used to sign the certificate requests, anyone holding this can sign certificates on your behalf. So keep it in a safe place!

openssl genrsa -des3 -out rootCA.key 4096

Recon and Attack Vectors from My Logs

This document contains excerpts from my web server logs collected over a period of 7 years that shows various kinds of recon and attack vectors.

There were a total of 37.2 million lines of logs out of which 1.1 million unique HTTP requests (Method + URI) were found.

$ sed 's/^.* - - \[.*\] "\(.*\) HTTP\/.*" .*/\1/' access.log &gt; requests.txt

Keycloak - Get IDP Token

Get Access Token

export TKN=$(curl -X POST 'http://127.0.0.1:8080/auth/realms/your-realm/protocol/openid-connect/token' \
 -H "Content-Type: application/x-www-form-urlencoded" \
 -d "username=your-user" \
 -d 'password=your-pass' \
 -d 'grant_type=password' \

JS REPL

There's not a good, simple embeddable REPL for JS out there that I could find. I wanted one for presentations on JavaScript concepts. The developer tools' console would be ideal, but bailing out of my presentation and opening a console brakes the flow. Tools like codepen.io et al. are great, but more overhead and set up than I need. I just want to type JS and show the result. This is a decent first step for my needs.

A Pen by Cory on CodePen.

License.

For those of you who want to try out systemd-networkd, you can read on, and find out in this tutorial how to switch from NetworkManager to systemd-networkd on Linux.

Requirement systemd-networkd is available in systemd version 210 and higher. Check the version of your systemd before proceeding.

$ systemctl --version

Switch from Network Manager to Systemd-Networkd

It is relatively straightforward to switch from Network Manager to systemd-networkd (and vice versa).

	//
	// ffmpeg_customfilter
	// - base name - ainfoda (audio filter)
	// - base name - vinfoda (video filter)
	//


	// 1. create new filein libavfilter/infoda_af.c
	// use any filters as template, simplest is af_afnull.c
	// filename is arbitrary (all recent named as af_name), but for me all my stuff called with

	/* Allocate aligned memory in a portable way.
	*
	* Memory allocated with aligned alloc MUST be freed using aligned_free.
	*
	* @param alignment The number of bytes to which memory must be aligned. This
	* value must be <= 255.
	* @param bytes The number of bytes to allocate.
	* @param zero If true, the returned memory will be zeroed. If false, the
	* contents of the returned memory are undefined.
	* @returns A pointer to `size` bytes of memory, aligned to an `alignment`-byte

	Source material:
	http://security.stackexchange.com/questions/24444/what-is-the-most-hardened-set-of-options-for-gcc-compiling-c-c
	https://wiki.gentoo.org/wiki/Hardened_Gentoo
	https://wiki.debian.org/Hardening

	================================================================================================================>
	GCC Security related flags and options:

	CFLAGS="-fPIE -fstack-protector-all -D_FORTIFY_SOURCE=2"
	LDFLAGS="-Wl,-z,now -Wl,-z,relro"

	d3 = require("d3");
	jsdom = require("jsdom");
	document = jsdom.jsdom();
	window = document.parentWindow;

	var sampleSVG = d3.select(document.body)
	.append("svg")
	.attr("width", 100)
	.attr("height", 100)