A sound bite from The Pragmatic Programmer: Your Journey To Mastery, 20th Anniversary Edition (2nd Edition) Interested? You can grab a copy of this book from Amazon. https://www.amazon.com/Pragmatic-Programmer-journey-mastery-Anniversary/dp/0135957052

Reduce SSH brute force attacks by changing your default SSH server (sshd) port from port 22 to a different one. Below is a sshd log example of a brute force attacks. Changing the port You can change the default port by editing the sshd configuration file. sudo nano /etc/ssh/sshd_config Find the line that say #Port. Remove the # symbol and set the port number you prefer. Refer to the image below as reference....

Some Linux servers were security hardened by changing the default SSH port from port 22 to a different port number. To use rsync with a different SSH port, add ‘ssh -p 12345’ in the rsync parameters. Push rsync -azvP -e 'ssh -p 12345' SOURCE [email protected]:DEST Pull rsync -azvP -e 'ssh -p 12345' [email protected]:SOURCE DEST

Google’s reCAPTCHA is one of the tool we can use to stop malicious internet bots from abusing our web applications. It comes in two versions, reCAPTCHA v2 and v3. Version 3 uses a score-based method with no user interaction. Version 2 uses a checkbox that will require users to answer a question. In this tutorial we will focus on reCAPTCHA v2. Prerequisite This tutorial requires the following: Registered Google webmaster account Domain registered property in Google webmaster Created Google reCAPTCHA account – https://www....

The go:embed feature was introduce in Go 1.16. It lets you embed resources into the compiled application. Prior to version 1.16, developers uses external tooling to do this. With go:embed you can embed images, webpages, email templates, predefined SQL statements or an entire directory. That’s neat! Usage Examples Embedding a text file in a string //go:embed version.txt var version string Embedding a binary file //go:embed product-catalog.pdf var catalog []byte Embedding a directory filesystem //go:embed template/* var templateFS fs....

I was creating an Active Directory (AD) security auditing tool in Go and Python when I stumbled upon the UserAccountControl flags. This attribute can hold multiple statuses like ACCOUNTDISABLE, NORMAL_ACCOUNT, or DONT_EXPIRE_PASSWORD. It uses a bit-field; a bit-field is a group of bits with each bit representing a value. It is an efficient way of handling multiple statues of a record. A tool that helps identify the property flags. Since a bit-field can hold a range of values, I need a tool that can help me look up the value it represents....

I am backing-up a large number of files to another computer when this idea came to me to write a Python script that generate and validate batch MD5 checksum. Feel free to customize the script according to your needs.

Do you want to rename a number of files that begins with a specific name or string? I wrote this small Python script that does that. Of course, you can also do this with Bash or Powershell. I hope somebody might find it useful. import os import sys from os import path parameters = sys.argv[1:] if len(parameters) == 0: print(f"usage: {sys.argv[0]}<startswith-string>") sys.exit(0) if len(parameters) > 0: for file in os.listdir(): if file....

If your SSH connection to your Raspberry Pi is freezing or unstable it could be because of OpenSSH TOS (Type of Service). To fix this, add IPQoS cs0 cs0 in the sshd configuration file. Open your /etc/ssh/sshd_config and add IPQoS cs0 cs0 at the bottom of the file. Please refer to the example configuration file below. # $OpenBSD: sshd_config,v 1.103 2018/04/09 20:41:22 tj Exp $ # This is the sshd server system-wide configuration file....

Setting up static IP address in Debian Linux is easy. In this simple guide, I will be configuring the IP address using the old way (ifconfig) and requires that you have system administration rights to do the following steps: Open the network interface file with the following command: sudo vi /etc/network/interfaces Once opened you might see something similar like this Your interface label might be different from the example but in this case we are interested in making interface ens33 to have a static IP....