this post was submitted on 10 Dec 2023
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Privacy DNS Chooser Script v1.0 "Snow Breeze" (kbin.social)
submitted 11 months ago* (last edited 11 months ago) by Baritone5371@kbin.social to c/linux@lemmy.ml
18 comments fedilink hide all child comments
 

Disclaimer : I'm the author of this project.

🚀 Privacy DNS Chooser Script v1.0 "Snow Breeze" Release!

Project source code : https://github.com/rollsicecream/privacy-dns-chooser

Dear Community,

I'm thrilled to announce the official release of the Privacy DNS Chooser Script v1.0, code-named "Snow Breeze"! This marks a significant milestone in my journey to simplify the process of enabling DNS-over-TLS with privacy-focused DNS providers on Linux systems using systemd-resolved.

Key Highlights:

  • User-Friendly Setup: Easily configure DNS-over-TLS with a seamless and intuitive CLI Interface
  • Privacy-Focused Providers: Choose from trusted DNS providers like Quad9, Mullvad DNS, and NextDNS (more coming soon!)
  • Enhanced Security: DNS-over-TLS is enabled by default for a more secure online experience.

How to Get Started:

  1. Ensure you have systemd-resolved installed on your Linux system.
  2. Download the script from GitHub.
  3. Run the script with sudo to set up your preferred DNS provider.

Your Feedback Matters:

We value your feedback! Share your experience, report issues, or suggest improvements on GitHub Issues. Your insights help us refine and enhance the Privacy DNS Chooser Script.

Spread the Word:

Help us reach more users by sharing the news! Talk about it, share on your favorite forums, and let your community know about the release.

Thank you!

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[–] _s10e@feddit.de 2 points 11 months ago (1 children)

Have you looked into how existing software handles captive portals. I believe, both Ubuntu (or Gnome or Network-Manager) and Firefox do check for such portals and detect real internet access. (They simple poll some URL http://detectportal.vendor.com and check for the expected return code. Portals usually redirect.)

Now I'm thinking, what if this check could trigger a change to the DNS configuration. That is use DoT when internet is available, otherwise fall back to DHCP announced DNS

[–] Pantherina@feddit.de 2 points 11 months ago

That is neat! It is a specific response so it should work.

#!/bin/bash

# Function to set insecure DNS
function insecure-dns() {
  # Backup the original resolved.conf file
  cp /etc/systemd/resolved.conf /etc/systemd/resolved.conf.bak

  # Modify resolved.conf to disable custom DNS, DoT, and DNSSEC
  sed -i 's/^DNS=.*/#DNS=/; s/^Domains=.*/#Domains=/; s/^DNSOverTLS=.*/#DNSOverTLS=/; s/^DNSSEC=.*/#DNSSEC=/' /etc/systemd/resolved.conf

  # Restart systemd-resolved
  systemctl restart systemd-resolved
}

# Function to set secure DNS
function secure-dns() {
  # Restore the original resolved.conf file
  mv /etc/systemd/resolved.conf.bak /etc/systemd/resolved.conf

  # Restart systemd-resolved
  systemctl restart systemd-resolved
}

while true; do
  response=$(curl -sI captive.test.com | head -n 1 | cut -d' ' -f2)

  if [ "$response" == "200" ]; then
    insecure-dns
    xdg-open captive.test.com
    sleep 30
    # something to wait until window is closed, otherwise spam!
  else
    secure-dns
  fi

  sleep 5
done

This should work. What would be needed is to track the process of the login and only continue when the window is closed again.