Dec 31, 2022

Moving to GitHub

Tags:

Starting from 2023, this blog is moving to GitHub to continue on my personal web site and blog management. 

Thank you Blogger.com This is a long journey 16 years. Let's continue on https://myseq.github.io/


Dec 24, 2022

Cybersecurity Vs Database Engineering

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What is the difference between Cybersecurity and Database engineering?

Cybersecurity specialists thinks 24 hours, and database engineer thinks end of every quarter.

Dec 23, 2022

The different between Information security, security resilience and cybersecurity

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Here is a Venn diagram that shows the difference between Information Security, Security Resilience, and Cybersecurity.

       _____________
      /             \
     /   Cyber-    \
    |  security     |
     \_____________/
          |   |
          |   |
    _____________________
   |                     |
   |   Security Resilience |
   |_____________________|
          |   |
          |   |
     ___________________
    |                   |
    | Information Security |
    |___________________|
 

The diagram shows that Cybersecurity is a subset of Security Resilience, as Security Resilience encompasses not just Cybersecurity but also physical security, incident response planning, and business continuity planning. Similarly, Information Security is a subset of Security Resilience, as Security Resilience encompasses a broader set of security-related activities beyond just information security.

Dec 22, 2022

Is there a difference between information security and Cybersecurity ?

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Yes, there is a difference between information security and cybersecurity, although the two terms are often used interchangeably.

Information security is a broader term that encompasses the protection of all forms of information, both digital and non-digital, from unauthorized access, use, disclosure, disruption, modification, or destruction. This includes physical security measures, such as locks and access controls, as well as technical and administrative controls, such as encryption and policies and procedures.

Cybersecurity, on the other hand, specifically refers to the protection of digital information and systems from cyber threats, such as cyber attacks, hacking, malware, and other forms of unauthorized access, use, or disclosure. It involves the use of technical measures, such as firewalls, intrusion detection systems, and encryption, to secure digital assets.

In summary, information security is a broader concept that includes both physical and digital security, while cybersecurity is a specific subset of information security that focuses solely on digital security.

Dec 21, 2022

Setup Jekyll

Tags: ,

Jekyll is one of the most popular generators for static websites and is based on Ruby. To realize the actual website, the generator uses CSS, HTML and Markdown. Jekyll also offers easy migration from WordPress or other systems to the new environment.

Here the steps I followed to setup Jekyll on Ubuntu.


Let's start with installing Ruby and prerequisites.

$ sudo apt install ruby-full build-essential zlib1g-dev

Then, setup the gem installation directory in the BASH startup.

$ echo '# Install Ruby Gems to ~/gems' >> ~/.bashrc
$ echo 'export GEM_HOME="$HOME/gems"' >> ~/.bashrc
$ echo 'export PATH="$HOME/gems/bin:$PATH"' >> ~/.bashrc
$ source ~/.bashrc

Next, install Jekyll and Bundler:

$ gem install jekyll bundler

Now, just clone from the GitHub with the theme Chirpy.

$ git clone https://github.com/cotes2020/jekyll-theme-chirpy

Last,  install the dependencies and run local server.

$ cd jekyll-theme-chirpy

$ bundler

$ bundle exec jekyll serve --host 0.0.0.0

http://0.0.0.0:4000/



Dec 16, 2022

Vulnerability Scanner for Open Source

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Finally, Google has released the OSV-scanner as a free tool that gives opensource developers access to vulnerability information which may relevant to their projects.

With the new launching OSV.dev service, it allows all the different opensource ecosystems and vulnerability databases to publish and consume information in one simple, precise, and machine readable format (JSON).

OSV-scanner is an effort to provide supported fronted to the OSV database (OSV.dev) that connects a project's list of dependencies with vulnerabilities that affect them. 

There are a few ways to use OSV:

So, let's get start running the OSV-scanner on your project to find all the dependencies that are being used by analyzing manifests, SBOMs, and commit hashes. The scanner hen connects this information with the centralized OSV database and displays the vulnerabilities relevant to your project.


Links:

Dec 15, 2022

OpenSSF Scorecard

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OpenSSF Scorecard is one of the initiative from Open Source Security Foundation or OpenSSF. It is a tool to provide quick access to opensource projects for any risky practices via automated checks.

To run the checks, there are 2 ways:

  1. Run automatically on code you own using the GitHub Action
  2. Run manually on your (or somebody else’s) project via the Command Line

Scorecard checks for vulnerabilities affecting different parts of the software chain including source code, build, dependencies, testing, and project maintenance.


Links:

Dec 13, 2022

Upgrade to Python 3.11 on Ubuntu 22.04 LTS

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My Ubuntu 22.04 (WSL) comes with Python 3.10.6, and I need to upgrade it to 3.11 for a workshop. (More importantly is, it claims to be 10-60% faster than the previous 3.10. 😎

Here are the steps:

$ sudo add-apt-repository ppa:deadsnakes/ppa

$ sudo apt update  

$ sudo apt install python3.11-full

$ python3.11 --version
Python 3.11.1


Next. To set Python 3.11 as default.

$ sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.10 110

$ sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.11 100

$ sudo update-alternatives --config python3


Dec 11, 2022

Python-HTTPX Vs. Python-Requests

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#!/usr/bin/evn python3 

# -*- coding: utf-8 -*-

import httpx

import requests

 

In general, both the module are similar, Here, I just make a simple comparison on what are the differences between Python HTTPX and Requests module.

 


 Requests HTTPX
Sessions requests.Session() httpx.Client()
Async support
 Not supported
 httpx.AsyncClient()
HTTP/2 support
 Not supported httpx.Client(http2=True)
httpx.AsyncClient(http2=True)


I have started moving over to HTTPX since Dec 2022.


Links:

Dec 10, 2022

Security Role Management Best Practices

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Everyone know RBAC is important. And this is one of the best webinar that demonstrate how the best practices in designing RBAC.

Notes:

  • Complexity is the enemy of security
  • Don't let perfect become the enemy of the good. 80/20
  • Be flexible and ready to be changed over time.
  • Top-down approach design
  • Bottom-up approach for role discovery (engineering)
  • Business user tier Vs App entitlement tier.

Dec 8, 2022

CISA KEV Catalog Hits 860 After 13 Months

Tags: ,
Top 10 vendors and vulnerable products

CISA starts to share KEV catalog to public back in Nov 3, 2021. There are total of 860 cve been added into KEV catalog after 13 months (849 cve by Nov 3).

Too many organizations are relying on the Common Vulnerability Scoring System, developed at FIRST.org, to decide when it is time to patch.Vulnerabilities with a Low/Medium CVSS score are often ignored completely or deferred to another time, while a vulnerability with a 7.0 and above generates a hair-on-fire “patch now” event.

And this is the reason why patches just don’t get applied in a timely fashion all the time.

It is time we reexamine each of our vulnerability management programs to assure we are not letting impactful and known CVEs continue to exist in our networks long past the time that vendor fixes are available. We need to evolve our practices to incorporate capabilities such as KEV into our operational vulnerability analysis decision making.

The screenshot above shows the top 10 vulnerable products and the vendors within the KEV catalog. And I have shared the script at GitHub back in April 2022.


Links:

Dec 7, 2022

Make Some CmdLine Fun on ChatGPT

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Let's make some hacking/cmdline fun on ChatGPT.

Do you know wha is the OS, how much memory and hard disk size used by ChatGPT? It is running on

  • Ubuntu 18.04 LTS 
  • with 4GB RAM 
  • and 500GB disk size  

😮 😮 😮 😮 😮 😮

First login to ChatGPT at https://chat.openai.com/chat with Google account.

Second, enable the terminal by paste into ChatGPT:

I want you to act as a Linux terminal. I will type commands and you will reply with what the terminal should show. I want you to only reply with the terminal output inside one unique code block, and nothing else. Do not write explanations. Do not type commands unless I instruct you to do so. When I need to tell you something in English I will do so by putting text inside curly brackets {like this}. My first command is pwd.

Next, we can continue with all cmdline that we are familiar:

  • whoami
  • w
  • uptime
  • ip route
  • ip addr show
  • free -h  
  • sudo fdisk -l /dev/sda
  • sudo su -
  • cat /etc/passwd
  • cat /etc/shadow
  • (evil) rm -rf /* &

 

lsb_release -a

free -h


fdisk -l /dev/sda


cat /etc/passwd


cat /etc/shadow

uptime


Personally, I don't think the information above is true, but it is fun to see this sometimes. 😇

 

Links:

Dec 6, 2022

OpenAI ChatGPT

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ChatGPT is a language model developed by OpenAI. GPT-3 stands for "Generative Pretrained Transformer 3" and is a type of artificial intelligence (AI) that is designed to generate human-like text. 

ChatGPT is specifically designed to be used in chatbot applications, where it can generate natural-sounding responses to user inputs.

screenshot taken

ChatGPT can remember what we said, and allow for follow up questions. Such as:

  • What is HTTP request?
  • How do I create it in Python?

chatGPT

ChatGPT can support multiple languages, and even .............

秋天的诗


Let's start to get some fun.

 

Links:

Dec 5, 2022

OpenAI DALL-E 2

Tags:

OpenAI created a tool to generate AI images and make it available to everyone on Internet. The tool is called DALL-E 2.

Login to DALL-E 2 at https://openai.com/dall-e-2/ with Google account. And just type in any description to generate image, such as:

an old man and a dog walking at beach

We can also add append some keywords to be more specific, such as:

an old man and a dog walking at beach, line art

Keywords can be:

  • ascii art
  • line art
  • digital art 
  • oil painting
  • one-line drawing

an old man and a dog walking along beach, oil painting


Links:

Dec 3, 2022

5 Experimental Flags in Microsoft Edge

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Goto edge://flags at URL bar, and enable the following:

 

1. Enhance text contrast 

edge://flags/#edge-enhance-text-contrast 



2. Show block option in autoplay settings

edge://flags/#edge-autoplay-user-setting-block-option



3. Show Windows 11 visual effects in the title bar and toolbar 

edge://flags/#edge-visual-rejuv-mica



4. Assigns the Backspace key to go back a page

edge://flags/#edge-backspace-key-navigate-page-back



5. Rounded tabs 

edge://flags/#edge-visual-rejuv-rounded-tabs

 

Links:

Dec 1, 2022

Simulate Linux's SUDO in PowerShell

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To start a notepad.exe process as normal user:

c:\> notepad.exe

To start a notepad.exe process as normal user with PowerShell:

PS> Start-Process notepad


To open a file as Administrator with PowerShell:

Start-Process 'notepad' -Verb runAs -ArgumentList c:\windows\system32\drivers\etc\hosts


To simulate 'sudo' with PowerShell Cmdlet

-----------8<------------------

function sudo
{
  if ($args.Count -gt 0)
  {
    $lastIndex = $args.Count-1
    $programName = $args[0]
    if ($args.Count -gt 1)
    {
      $programArgs = $args[1 .. $lastIndex]
    }
    Start-Process $programName -Verb runAs -ArgumentList $programArgs
  }
  else
  {
    if ($env:WT_SESSION) {
      Start-Process "wt.exe" -Verb runAs
    }
    elseif ($PSVersionTable.PSEdition -eq 'Core')
    {
      Start-Process "$PSHOME\pwsh.exe" -Verb runAs
    }
    elseif ($PSVersionTable.PSEdition -eq 'Desktop')
    {
      Start-Process "$PSHOME\powershell.exe" -Verb runAs
    }
  }
}

Set-Alias -Name su -Value sudo

-----------8<------------------


To use the cmdlet:

PS> sudo notepad c:\windows\system32\drivers\etc\hosts


Links:

Nov 30, 2022

Zero Effort Zero Trust for Blocking Zero Days in Kubernetes

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Let's learn the zero trust segmentation for network, process, and file access within K8s cluster with Tracy Walker. 


Threat-Based Controls Zero-Trust Controls
CVEs Automated Learning
DLP Network
Network Attacks Process
OWASP Top 10 WAF File Access
Admission Control Security as Code



The Automated Behavioral-based Zero-Trust covers:

  • Discover mode - identifies apps behavior (learning mode)
  • Monitor mode - alerts to any anomalous app behavior
  • Protect mode - denies on any anomalous app behavior

 

The demo will show how Zero Trust can protect against zero-day attacks as well as exploits such as Log4j and Spring4shell.


Links:

Nov 26, 2022

Docker Network 101

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Learn how the docker/container network works.

Different Docker Network Types:

  1. Bridge (default)
  2. User-defined bridge
  3. Host
  4. Mac Vlan
  5. Mac Vlan (802.1q)
  6. IP Vlan (L2)
  7. IP Vlan (L3)
  8. Overlay
  9. None
Interface Description
eth0 VM host network interface
docker0 Virtual bridge interface (switch)

Show the default docker network interface

ubuntu@docker:~$ docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
e2397b67991e   bridge    bridge    local
f6648d670e10   host      host      local
031ec528726f   none      null      local
ubuntu@docker:~$

Start the first container () with default bridge driver.

ubuntu@docker:~$ docker run -itd --rm --name dnet_bridge busybox
e05bdb96427b458d649c0ca8eb6d800a50dde48c6619df34121f3f6c29b36f6f
ubuntu@docker:~$ docker ps
CONTAINER ID   IMAGE     COMMAND   CREATED         STATUS         PORTS     NAMES
e05bdb96427b   busybox   "sh"      5 seconds ago   Up 4 seconds             dnet_bridge
ubuntu@docker:~$

By default, the bridge network applies NAT masq for accessing to external but never expose the container to external network. We need to expose the port if we need the external network to access to our docker container.

ubuntu@docker:~$ docker run -itd --rm -p80:80 --name web01 nginx
e83d9abbea4a909f579a0461c9fb04a8247dd42100b7be08cd701cf9740d856c
ubuntu@docker:~$ docker ps
CONTAINER ID   IMAGE     COMMAND                  CREATED         STATUS         PORTS                               NAMES
e83d9abbea4a   nginx     "/docker-entrypoint.…"   4 seconds ago   Up 4 seconds   0.0.0.0:80->80/tcp, :::80->80/tcp   web01
13f8d2d6f05f   busybox   "sh"                     4 minutes ago   Up 4 minutes                                       dns01
e05bdb96427b   busybox   "sh"                     9 minutes ago   Up 9 minutes                                       dnet_bridge
ubuntu@docker:~$

 

Second. Let's define our own bridge network. This is mainly for segregating (isolation) the containers.

ubuntu@docker:~$ docker network create dmz
71a335a2c869afde71ff4d6debf5155b319e65894c7c83dcea1b1d6e208eb882
ubuntu@docker:~$ docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
e2397b67991e   bridge    bridge    local
71a335a2c869   dmz       bridge    local
f6648d670e10   host      host      local
031ec528726f   none      null      local

ubuntu@docker:~$ docker run -itd --rm --network dmz -p80:80 --name web01 nginx
9ddc5bd9c13c884237aa7164a4c4f3c17498a68da64c735879eaf479c397a433
ubuntu@docker:~$ docker ps
CONTAINER ID   IMAGE     COMMAND                  CREATED          STATUS          PORTS                               NAMES
9ddc5bd9c13c   nginx     "/docker-entrypoint.…"   9 seconds ago    Up 8 seconds    0.0.0.0:80->80/tcp, :::80->80/tcp   web01
e05bdb96427b   busybox   "sh"                     16 minutes ago   Up 16 minutes                                       dnet_bridge
ubuntu@docker:~$


Third. We call it host network. This makes the container runs on the same network as the VM host.

ubuntu@docker:~$ docker run -itd --rm --network host --name web02 nginx
3022063adc651f94e23edd8755c7c9521f40a7b2df157bfc92c66f21016d3842
ubuntu@docker:~$


Forth. We call it MAC-VLAN (bridge mode).

ubuntu@docker:~$ docker network create -d macvlan --subnet 172.31.112.0/20 --gateway 172.31.112.1 -o parent=eth0 vlan1
373a821c44aefb4030109482f9480008bf87a152ad74a6c714cbeaa57f73e6dc
ubuntu@docker:~$ docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
e2397b67991e   bridge    bridge    local
71a335a2c869   dmz       bridge    local
f6648d670e10   host      host      local
031ec528726f   none      null      local
373a821c44ae   vlan1     macvlan   local
ubuntu@docker:~$

ubuntu@docker:~$ sudo ip link set eth0 promisc on
ubuntu@docker:~$


Fifth. We call it MAC-VLAN (802.1q mode).

ubuntu@docker:~$ docker network create -d macvlan --subnet 192.168.20.0/24 --gateway 192.168.20.1 -o parent=eth0.20 vlan20
3634f36fe849afa8d7dfc65589b71aa0c0902bd6bc1ed294e0d258ffc14e640f
ubuntu@docker:~$ docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
e2397b67991e   bridge    bridge    local
71a335a2c869   dmz       bridge    local
f6648d670e10   host      host      local
031ec528726f   none      null      local
373a821c44ae   vlan1     macvlan   local
3634f36fe849   vlan20    macvlan   local
ubuntu@docker:~$

ubuntu@docker:~$ docker run -itd --rm --network vlan3 --ip 192.168.94.7 --name dns01 busybox
de504908dc372c0f017a36c4357c70a1f28acd0a7f763bb372642c96e89baef9
ubuntu@docker:~$ docker run -itd --rm --network vlan3 --ip 192.168.94.8 --name dns02 busybox
2dc61bd9a45f828493fe1b55f8786692740baf5079deeddb5cefebe2468aa583
ubuntu@docker:~$ docker run -itd --rm --network vlan3 --ip 192.168.95.9 --name web01 busybox
a1d23a1691d0c2fd33b03d023bc03bb0a282e39a8f254bdf54fbab4d3e46a9de
ubuntu@docker:~$ docker run -itd --rm --network vlan3 --ip 192.168.95.10 --name web02 busybox
9cc2db6492de35f5a2fa230702e5e41ff4bf75bd563eac71bf39d0e7171b0e0f
ubuntu@docker:~$ docker ps
CONTAINER ID   IMAGE     COMMAND   CREATED              STATUS              PORTS     NAMES
9cc2db6492de   busybox   "sh"      4 seconds ago        Up 3 seconds                  web02
a1d23a1691d0   busybox   "sh"      13 seconds ago       Up 13 seconds                 web01
2dc61bd9a45f   busybox   "sh"      35 seconds ago       Up 35 seconds                 dns02
de504908dc37   busybox   "sh"      About a minute ago   Up About a minute             dns01
ubuntu@docker:~$

 

Sixth. We call it IP-VLAN (L2) - layer_2. This will share the same mac address with the VM host, and must allow 1 mac addr with 20 IP addresses associated on the network.

ubuntu@docker:~$ docker network create -d ipvlan --subnet 172.31.112.0/20 --gateway 172.31.112.1 -o parent=eth0 vlan2
40aadb9f60c3dc889c8b9a30e627d5a314226c204ca48f09375447def53b4ad4
ubuntu@docker:~$


Seventh. We call it IP-VLAN (L3) - layer_3. Everything is connecting to host and host is functioning like router. And we have more control on the traffic.

ubuntu@docker:~$ docker network create -d ipvlan --subnet 192.168.94.0/24 -o parent=eth0 -o ipvlan_mode=l3 --subnet 192.168.95.0/24 vlan3
000b2c4799a4fd62a4435d99eed592ae8fa7ad5b8b797aeb7e06322b477f7ecf
ubuntu@docker:~$ docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
e2397b67991e   bridge    bridge    local
71a335a2c869   dmz       bridge    local
f6648d670e10   host      host      local
031ec528726f   none      null      local
000b2c4799a4   vlan3     ipvlan    local
ubuntu@docker:~$

 * Need to add static route at the router in order for the network to reach back to vlan3.

 

Eighth. We call it Overlay network. And it is used to link up multiple host, create an overlay network, and create rule to allow the containers (at different host) to talk to each other.

Usually it is used with Docker Swarm.

 

Last (9th) is None network.

ubuntu@docker:~$ docker run -itd --rm --network none --name xnet busybox
0c21ccbb87d1937dd7ce18da696a5bd7ca1530969a4198992e5852e3d0593d14
ubuntu@docker:~$


Links:

Docker Compose 102

Tags: , ,

Let's follow the steps to create more complex docker images:

  • frontend - wordpress image
  • backend - mysql image


First, we just start a docker images with Multipass.

PS> multipass launch docker -n kiko

Login to docker (kiko) and start creating docker-compose.yaml.

PS> multipass shell kiko

ubuntu@kiko:~$ mkdir blog && cd blog

ubuntu@kiko:~/blog$ vi docker.compose.yaml

---------------------------------------------------

version: "3"
services:
  frontend:
    image: wordpress
    ports:
      - "8089:80"
    depends_on:
      - backend
    environment:
      WORDPRESS_DB_HOST: backend
      WORDPRESS_DB_USER: root
      WORDPRESS_DB_PASSWORD: "coffee"
      WORDPRESS_DB_NAME: wordpress
    networks:
      dmz:
        ipv4_address: "192.168.33.89"
  backend:
    image: "mysql:5.7"
    environment:
      MYSQL_DATABASE: wordpress
      MYSQL_ROOT_PASSWORD: "coffee"
    volumes:
      - ./mysql:/var/lib/mysql
    networks:
      dmz:
        ipv4_address: "192.168.33.90"
networks:
  dmz:
    ipam:
      driver: default
      config:
        - subnet: "192.168.33.0/24"

----------------------------------------------------

ubuntu@kiko:~/blog$ docker-compose up -d 

ubuntu@kiko:~/blog$ docker-compose ps

ubuntu@kiko:~/blog$ docker network ls

ubuntu@kiko:~/blog$ docker inspect blog_dmz

 

http://kiko.mshome.net:8089/


Links:

  • Docker Compose 101

Nov 24, 2022

Docker Compose 101

Tags: , ,

Let's follow the steps to create first docker images.


First, we just start a docker images with Multipass.

PS> multipass launch docker -n kiko

Login to docker (kiko) and start creating docker-compose.yaml.

PS> multipass shell kiko

ubuntu@kiko:~$ mkdir coffee && cd coffee

ubuntu@kiko:~/coffee$ vi docker.compose.yaml

---------------------------------------------------

version: "3"
services:
  website:
    image: nginx
    ports:
      - "8081:80"
    restart: always 

----------------------------------------------------

ubuntu@kiko:~/coffee$ docker-compose up -d 

ubuntu@kiko:~/coffee$ docker-compose ps

Add second image with different network (coffee).

ubuntu@kiko:~/coffee$ vi docker.compose.yaml

---------------------------------------------------

version: "3"
services:
  website:
    image: nginx
    ports:
      - "8081:80"
    restart: always
  website2:
    image: nginx
    ports:
      - "8082:80"
    restart: always
    networks:
      coffee:
        ipv4_address: 192.168.92.22
networks:
  coffee:
    ipam:
      driver: default
      config:
        - subnet: "192.168.92.0/24"

----------------------------------------------------

ubuntu@kiko:~/coffee$ docker-compose up -d 

ubuntu@kiko:~/coffee$ docker network ls 

ubuntu@kiko:~/coffee$ docker inspect coffee_default 

ubuntu@kiko:~/coffee$ docker inspect coffee_coffee


Links:

Nov 23, 2022

Docker Container 101

Tags: , ,

Virtualization or hypervisor virtualizes hardware; docker container virtualizes OS kernel.

First, we just start a docker images with Multipass.

PS> multipass launch docker -n kiko

Login to docker and start download the images.

PS> multipass shell kiko

ubuntu@kiko:~$ docker pull centos

ubuntu@kiko:~$  docker container run -itd --name cc centos

ubuntu@kiko:~$ docker exec -it cc bash 

[root@a4d5e22b6ef5 /]# cat /etc/os-release

Try download other images.

ubuntu@kiko:~$ docker pull archlinux 

ubuntu@kiko:~$ docker pull ubuntu

ubuntu@kiko:~$ docker pull almalinux

ubuntu@kiko:~$ docker run -itd --name uu ubuntu

Check the utilization and stop the container.

ubuntu@kiko:~$ docker stats

ubuntu@kiko:~$ docker stop uu cc 

 

Why container runs so fast and why use container?

  • share the kernel with hosts (compare to separate guest OS kernel).
  • use control group to define cpu, mem, disk, network namespaces.
  • container is portable.
  • micro-service concept.


Links:

Nov 21, 2022

Redmine on Docker

Tags: ,

This is a quick tutorial on setting up a Redmine on Docker container.

 

Overview

Redmine is a flexible project management web application written using Ruby on Rails framework.


Architecture

This is to simulate how to dockerize a production-ready infrastructure on Redmine application using Nginx as reverse proxy.


Prerequisite

I'm using the Multipass to setup my docker platform.

PS> multipass launch docker -n dido

PS> multipass shell dido


Setup

First, create 3 files within an empty folder.

  1. Dockerfile
  2. conf/default.conf
  3. conf/supervisord.conf

~$ mkdir red

~$ cd red

~/red$ cat Dockerfile 

------------------8<-------------------------

FROM redmine:5

RUN apt update && \
    apt install -y \
    supervisor \
    nginx && \
    apt clean && \
    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

COPY conf/supervisord.conf /etc/supervisor/conf.d/supervisord.conf
COPY conf/default.conf /etc/nginx/sites-available/default

EXPOSE 80

ENTRYPOINT ["/usr/bin/supervisord", "-c", "/etc/supervisor/conf.d/supervisord.conf"]

------------------8<------------------------- 

~/red$ cat conf/default.conf

------------------8<------------------------- 

server {
    listen       80;
    server_name  _;

    location / {
        proxy_pass http://127.0.0.1:3000;
    }
}

------------------8<------------------------- 

~/red$ cat conf/supervisord.conf

------------------8<------------------------- 

[supervisord]
nodaemon=true
user=root

[program:nginx]
user=root
command=nginx

[program:redmine]
user=redmine
directory=/usr/src/redmine
command=/docker-entrypoint.sh rails server -b 127.0.0.1

------------------8<-------------------------

 

Build the Docker Image

Next, build the docker image called "redapp".

~/red$ docker build -t redapp . 

Sending build context to Docker daemon  4.608kB
Step 1/6 : FROM redmine:5
 ---> 7cc28c5d1864
Step 2/6 : RUN apt update &&     apt install -y     supervisor     nginx &&     apt clean &&     rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 ---> Using cache
 ---> 03ee1eb12c0a
Step 3/6 : COPY conf/supervisord.conf /etc/supervisor/conf.d/supervisord.conf
 ---> Using cache
 ---> bfaee539e7d4
Step 4/6 : COPY conf/default.conf /etc/nginx/sites-available/default
 ---> Using cache
 ---> 8f20ffe3be6a
Step 5/6 : EXPOSE 80
 ---> Using cache
 ---> de69fec60e49
Step 6/6 : ENTRYPOINT ["/usr/bin/supervisord", "-c", "/etc/supervisor/conf.d/supervisord.conf"]
 ---> Using cache
 ---> 3e9b0eecdfaf
Successfully built 3e9b0eecdfaf
Successfully tagged redapp:latest


Start the Docker image as Container

Next, run the container by exposing the port 80 (external on eth0 interface) with Nginx (internal port 80 on docker0 interface)

~/red$ docker run -p 80:80 -d redapp 

4851a3266f50ebd3ee7c3c69e87bc2e4697e74e699839b21f566119c39e5665f


Access the Redmine Application

Last, point the browser to the URL at http://172.18.238.107/login (where 172.18.238.107 is the IP address at my eth0 interface).

http://172.18.238.107/login

Links:

Nov 7, 2022

Weather at CmdLine

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Check or curl your weather at cmdline with :

$ curl -s wttr.in/Melbourne?format="%l:%c+%C+%t/%f+%h+%w+%m+UV:%u/12+%P"
Melbourne:⛅️  Partly cloudy +15°C/+14°C 59% ↑31km/h 🌗 UV:3/12 1016hPa

$ curl -s wttr.in/New+York?format="%l:%c+%C+%t/%f+%h+%w+%m+UV:%u/12+%P"
New+York:☀️   Clear +1°C/-3°C 56% ↓15km/h 🌗 UV:1/12 1022hPa

PS> Invoke-RestMEthod  'https://wttr.in/New+York?format="%l:%c+%C+%t/%f+%h+%w+%m+UV:%u/12+%P"'
New+York:☀️   Clear +1°C/-3°C 56% ↓15km/h 🌗 UV:1/12 1022hPa


Links:

Nov 5, 2022

Windows Commands

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This set of documentation describes the Windows Commands you can use to automate tasks by using scripts or scripting tools.

All supported versions of Windows and Windows Server have a set of Win32 console commands built in.

 

Links:

Nov 3, 2022

MS Teams Dev Mode

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Microsoft Teams is power by Electron, SlimCore, Chromium, Node.js, and V8 Javascript engine. (No wonder it sucks up all your memory)

To check your MS Teams version, you have to enter the Dev Mode with the following steps:

  1. Minimize your MS Teams, and you should see the small icon at taskbar (beside datetime).
  2. Continuously (left) click on the icon for 7 times.
  3. Right click the icon and you should see the hidden menu.
  4. Click "Get Electron/SlimCore version".

 


Nov 2, 2022

Firefox Tuning

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Once again, I need to tune my new Firefox browser settings.


Change settings with about:config:

Description Settings Values Default
To disable disk cache browser.cache.disk.enable false true
To disable disk cache on SSL browser.cache.disk_cache_ssl false true
To enable RAM cache browser.cache.memory.enable true true
To set RAM cache capacity based on 2GB physical memory browser.cache.memory.capacity 24576 -1


To view current memory cache usage, put about:cache?device=memory in the Location Bar.


Links:

Nov 1, 2022

Debugging Windows 11

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I was installing my printer driver to my new Windows 11.

And I need a debugger to troubleshoot my printer driver. It is time to get a Windows Debugger for the new OS.

The Windows Debugger (WinDbg) can be used to debug kernel-mode and user-mode code, analyze crash dumps, and examine the CPU registers while the code executes. 

Before get start with Windows debugging, we need to complete 2 things.

Seem like the easiest way to get Windows symbols is to use the Microsoft public symbol server. The symbol server makes symbols available to your debugging tools as needed and make it easier to debug your code. 

After a symbol file is downloaded from the symbol server it is cached on the local computer for quick access. And Microsoft no longer publishing the offline symbol packages for Windows.

While looking for WinDBG, I also found WinDbg Preview (at MS Store).

WinDbg Preview is the latest version of WinDbg with more modern visuals, faster windows, a full-fledged scripting experience, built with the extensible debugger data model front and center. In short, simply more user friendly.

And the best part is, WinDbg Preview is available in MS Store. Simply run the cmdline below to install it.

C:\> winget install WinDbg --source msstore

Links:

Oct 31, 2022

How fun is Windows?

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Received new laptop that runs Windows 11 over the weekend.


Had spent some times on customize a few things:
  1. Install Google_Pinyin 
  2. Setup the input method switching to (left) ctrl-shift notkey.
  3. Install WSL/WSL2
  4. Install Windows Terminal
  5. Install Multipass (VM orchestrator)
  6. Setup ssh-keygen
  7. Create sample multipass VM with cloud-init
  8. Install python3 (in Windows 11)

Between WSL and Multipass, I need to setup the routing in order for them to communicate.

PS> Set-NetIPInterface -ifAlias "vEthernet (WSL)" -Forwarding Enabled
PS> Set-NetIPInterface -ifAlias "vEthernet (Default Switch)" -Forwarding Enabled

And to show the final routing table:
PS> Get-NetIPInterface | select ifIndex,InterfaceAlias,AddressFamily,ConnectionState,Forwarding | Sort-Object -Property IfIndex | Format-Table

One the routing is configured, then I proceed with ssh-keygen and setup the public key authentication between WSL and multipass.

~$ cd .ssh
~/.ssh$ ssh-keygen -t ed25519 -C "xx@wsl2"
~/.ssh$ ssh-keygen -l -f id_ed25519.pub
~/.ssh$ ssh-copy-id -i id_ed25519.pub xx@remote_server


Next, I need to setup multipass VM with cloud-init.

Create a cloud-init.yaml file for multipass:
-------------------------------
users:
  - default
  - name: xx
    groups: sudo
    shell: /bin/bash
    sudo: ['ALL=(ALL) NOPASSWD:ALL']
    ssh_authorized_keys:
      - ssh-rsa <rsa keys in one line>
package_update: true
package_upgrade: true
packages:
  - nodejs
  - python3
-------------------------------


PS> multipass multipass launch -c 2 -m 2G -d 20G -n ubuntu-vm --cloud-init cloud_init.yaml


Learnt some tricks in Windows command line. I install Python (with cmdline) and locate where is the python.exe.

PS> winget install python --source msstore
PS> where python

Oct 30, 2022

wtfis

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Found an interesting tool called wtfis.

wtfis is a commandline tool that gathers information about a domain, FQDN or IP address using various OSINT services. 

This tool assumes that you are using free tier / community level accounts, and so makes as few API calls as possible to minimize hitting quotas and rate limits.

Setup

wtfis uses these environment variables:

  • VT_API_KEY (required) - Virustotal API key
  • PT_API_KEY (optional) - Passivetotal API key
  • PT_API_USER (optional) - Passivetotal API user
  • SHODAN_API_KEY (optional) - Shodan API key

Installation

$ pip install wtfis

Usage:

$ wtfis -h
usage: wtfis [-h] [-m N] [-s] [-n] [-1] [-V] entity

positional arguments:
  entity                Hostname, domain or IP

options:
  -h, --help            show this help message and exit
  -m N, --max-resolutions N
                        Maximum number of resolutions to show (default: 3)
  -s, --use-shodan      Use Shodan to enrich IPs
  -n, --no-color        Show output without colors
  -1, --one-column      Display results in one column
  -V, --version         Print version number


Links:

Oct 29, 2022

DevOps Exercises

Tags:

Found an interesting repo that shares resources about DevOps exercises and questions. It can be used for preparing for an interview. 

It is suitable for anyone who interested in pursuing a career as DevOps engineer, learning the concepts.


Links:

Oct 28, 2022

Steps to a successful GitSecOps approach

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GitOps is an approach to perform cloud operations (in DevOps way) by centralizing the desired state of system into code and enforcing change through automation via version control system (such as Git).

Git acts as a common place where workflows, automation, checks and balances can be applied before entering a production environment, enabling organizations with a crucial foothold to secure by design further than ever before.

By adopting GitOps, it means it is a commitment to interacting only with Git and leaving the integration and deployment jobs to be automated.

By ensuring that everything is code driven and declared, the risk from non-automated agents (a.k.a. humans) can be drastically minimized. 

For example, using the automation workflows, you can embed compliance scans to enforce best-practices and regulatory mandates to prevent mis-configurations. With detection of configuration drift, it becomes easier and quicker to isolate vulnerable/compromised resources for investigation.

GitOps can leverage DevSecOps tools, such as IaC scanning, security testing, IAM and secret management. And by bringing a security-as-code and adding compliance requirements and security policies into coded artifacts, organizations can embrace GitSecOps to effectively shift the security left.


Seven steps to a successful GitSecOps approach:

  1. Applying identity and access controls
  2. Enforcing change control and peer review workflows
  3. Observing end-to-end
  4. Keep secrets safe (vault or eternal key managers)
  5. Protecting audit logs
  6. Catching the drift
  7. Monitoring anomalous behavior

Just like DevSecOps, GitSecOps also requires the adoption of a new mindset and culture to getting things done in a cloud native way.

Sharing common tools, processes and goals — focused on a successful shared outcome rather than an isolated deliverable — ensures that the DevSecOps and GitSecOps goals are aligned to support each other and the organization’s digital transformation vision.


Links:

Oct 27, 2022

Modern Binary/Patch Diffing

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In this webinar, Stephen will demonstrate the process of downloading Microsoft cumulative updates to extract the patches and prep them for diffing. 

It's a very useful way to identify patched vulnerabilities that can potentially be weaponized for exploitation of un-patched systems, as well as learning how vulnerabilities are patched to aid in bug hunting. 

My notes:

  • Time consuming to find the diff. (use bindiff or diaphora)
  • 2022-10 x64 "Windows 10" 22H2  Vs "Cumulative windows 10"
  • 2 purposes:
    • weaponize patched vuln (n-day exploit)
    • find new 0-day vuln
  • MS doesn't obfuscate the patch management process. 😅
  • expand.exe -F:* .\xxxx.msu .\extract
  • expand.exe -F:* .\extract\xxxx.cab .\patch
  • expand.exe -F:* .\patch\yyyy.cab .\patch
  • expand.exe -F:* .\patch\zzzz.cab .\patch [20min++]
  • gci -Recurse c:\windows\WinSxS\ -Filter ntdll.dll
  • .\delta_patch.py -i .\NTDLL\ntdll.dll -o ntdll.2020-10.dll .\NTDLL\r\ntdll.dll .\2020-10\x64\ntdll.dll_10.0.18362.1139\f\ntdll.dll
  • .\delta_patch.py -i .\NTDLL\ntdll.dll -o ntdll.2020-11.dll .\NTDLL\r\ntdll.dll .\2020-11\x64\ntdll.dll_10.0.18362.1171\f\ntdll.dll


Links:

Oct 26, 2022

Moving from Operations to GitOps

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After the article on Operation Hates Agile, here comes next, how to move from Operations to GitOps.

IaC is the replacement of traditional operation. It allows enterprises to control changes and manage the configuration settings in cloud environments more efficiently.

First, we need to know what contained inside "Infrastructure as Code" or IaC. There are 3 characteristics in IaC:

  1. Imperative and Declarative
  2. Mutable and Immutable
  3. DevOps

Imperative Vs. Declarative

Most IaC is declarative in nature. However, we can always make changes to the cloud environment with both imperative or declarative automation.

To make imperative automation changes to cloud infra, we use cmdline interface (CLI). It directs changes to the cloud first within a container, then virtual machine (VM), and then virtual private cloud, through a script. This is a detailed checklist, but if the configuration needs to be changed after the push to multiple machines, the steps and the script would have to be repeat.

A declarative automation approach requires goal creation. For example, rather than using the CLI and listing the exact step-by-step configuration for a VM, you’d simply state that you want a VM with, say, a domain attached, and then let the automation take over. The declarative approach (most of the time in YAML) enables you to more easily state what needs to be accomplished by the automation tools.

Mutable Vs. Immutable

Mutable means that it is prone to change. A virtual machine is an example of mutable infrastructure.

Immutable infrastructure cannot be changed once deployed, such as container/docker. Changes will still occur, but they are made to the original declarative statements. Once the changes are ready, all like devices or configurations are changed consistently.

Most of the time, we use both imperative and declarative automation methods interchangeably to manage IaC. This may raise an issue called Configuration Drift.

Read more »

Oct 25, 2022

MHDDoS - DDoS Attack Script

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MHDDoS is a DDoS Attack Script written in Python3. It includes 56 attack methods (DoS/DDoS). 


Installation (1st way)

$ git clone https://github.com/MHProDev/MHDDoS.git
$ cd MHDDoS
$ pip install -r requirements.txt

 Installation (2nd way)

$ docker pull ghcr.io/mhprodev/mhddos:latest


Links:

Oct 24, 2022

Multipass Private SSH Key is Exposing to Everyone

Tags: ,

It is so convenience to use the command 'multipass shell jimny' whenever we need to access to VM created. 

But, how can we login without password? Where is the SSH private key?

Actually it is using SSH public key authentication for login to VM. 

Read more »

Oct 23, 2022

Windows Event Log Analysis

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Configuring logging on Windows systems, and aggregating those logs into a SIEM, is a critical step toward ensuring that your environment is able to support effective incident response using Incident response tools.

Events can be logged in the Security, System and Application event logs. 

Log NameEvent Log where the event is stored. Useful when processing numerous logs pulled from the same system.
SourceThe service, Microsoft component or application that generated the event.
Event IDA code assigned to each type of audited activity.
LevelThe severity assigned to the event in question.
User
The user account involved in triggering the activity or the user context that the source was running as when it logged the event.
OpCodeAssigned by the source generating the log.
LoggedThe local system date and time when the event was logged.
Task CategoryAssigned by the source generating the log.
KeywordsAssigned by the source and used to group or sort events.
ComputerThe computer on which the event was logged. This is useful when examining logs collected from multiple systems, but should not be considered to be the device that caused an event (remote workstation).
DescriptionA text block where additional information specific to the event being logged is recorded.

 

Types of Windows Event Log Analysis – Guide

  •     Account Management Events
  •     Account Logon and Logon Events
  •     Common Event ID 4768 result codes
  •     Logon event type code descriptions
  •     Common logon failure status codes
  •     Access to Shared Objects
  •     Scheduled Task Logging
  •     Object Access Auditing
  •     Audit Policy Changes
  •     Auditing Windows Services
  •     Wireless LAN Auditing
  •     Process Tracking
  •     Additional Program Execution Logging
  •     Auditing PowerShell Use


Go thru the complete incident response guide with the following link.


Links:

Oct 22, 2022

Couldn't open a raw socket. Error: Permission denied (13)

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With Multipass, do I still need VMware Player to run Linux with full privilege, under Windows OS ?

WSL is more common choice of running virtual machine nowadays comparing to VMware Player.

With Multipass, everything seems more easier/faster now. 😇 

Here's my story today, on how I need to run nmap port scan to a router.

PS> multipass launch -n scanner

PS> multipass shell scanner

ubuntu@scanner:~$ sudo snap install nmap

ubuntu@scanner:~$ sudo nmap -sU -p 53 192.168.31.1
Starting Nmap 7.93 ( https://nmap.org ) at 2022-10-21 23:17 +08
Couldn't open a raw socket. Error: Permission denied (13)

ubuntu@scanner:~$ sudo snap connect nmap:network-control

ubuntu@suzuki:~$ sudo nmap -sU -p 53 192.168.31.1
Starting Nmap 7.93 ( https://nmap.org ) at 2022-10-21 23:18 +08
Nmap scan report for XiaoQiang (192.168.31.1)
Host is up (0.0027s latency).

PORT   STATE SERVICE
53/udp open  domain

Nmap done: 1 IP address (1 host up) scanned in 0.06 seconds

ubuntu@scanner:~$ sudo nmap -n -sS -p 1-1024 192.168.31.1
Starting Nmap 7.93 ( https://nmap.org ) at 2022-10-21 23:35 +08
Nmap scan report for 192.168.31.1
Host is up (0.0075s latency).
Not shown: 1020 closed tcp ports (reset)
PORT    STATE SERVICE
53/tcp  open  domain
80/tcp  open  http
443/tcp open  https
784/tcp open  unknown

Nmap done: 1 IP address (1 host up) scanned in 0.34 seconds
ubuntu@scanner:~$

With this, I have more confidence with Multipass now. 😉

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