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  • PR-DNSd – Passive-Recursive DNS Daemon

PR-DNSd – Passive-Recursive DNS Daemon

August 1, 2022 Comments Off on PR-DNSd – Passive-Recursive DNS Daemon
PR-DNSd - Passive-Recursive DNS Daemon cybersecurity ethical hacking hack android hack app hack wordpress hacker news hacking hacking tools for windows keylogger kit kitploit password brute force penetration testing pentest pentest android pentest linux pentest toolkit pentest tools spy tool kit spyware tools

Passive-Recursive DNS daemon.

Quickstart

nameserver 127.0.0.1 | sudo tee /etc/resolv.conf dig google.com dig -x $(dig +short google.com)”>

go get github.com/korc/PR-DNSd
sudo setcap cap_net_bind_service,cap_sys_chroot=ep go/bin/PR-DNSd
go/bin/PR-DNSd -upstream 9.9.9.9:53 -listen 127.0.0.1:53
echo nameserver 127.0.0.1 | sudo tee /etc/resolv.conf
dig google.com
dig -x $(dig +short google.com)

If you can’t use setcap, you have to use -chroot "" and -listen :<high_port> options, or run as root.

Use cases

  • run as local host DNS service, to fix your netstat/tcpview/lsof etc. output
  • as enterprise-internal DNS server, to also be able to do meaningful EDR/IR and log analysis
  • as cloud service, to also collect Passive DNS data from non-enterprise (home, BYOD etc.) devices
    • hint: you probably want to configure DDoS protection options
  • in cloud as DNS-over-TLS server, to additionally provide private DNS for supporting devices (ex: Android 9’s private DNS setting)
    • ex: domain pattern based firewall/proxy configuration for mobile devices

Running as your own private server for Android9’s Private DNS settings

After appropriate setcap, run:

PR-DNSd -tlslisten :853 -cert YOUR_SERVER_CRT_KEY_PEM -upstream 1.1.1.1:53 -store pr-dnsd

Options

-cert string
TCP-TLS listener certificate (required for tls listener)
-chroot string
chroot to directory after start (default "/var/tmp")
-count int
Count of replies allowed before debounce delay is applied (default 100)
-ctmout string
Client timeout for upstream queries
-debounce string
Required time duration between UDP replies to single IP to prevent DoS (default "200ms")
-key string
TCP-TLS certificate key (default same as -cert value)
-listen string
listen address (default ":53")
-silent
Don't report normal data
-store string
Store PTR data to specified file
-tlslisten string
TCP-TLS listener address (default ":853")
-upstream string
upstream DNS serv er (tcp-tls:// prefix for DoT) (default "1.1.1.1:53")
(with tls and chroot, ensure ca-certificates and resolv.conf in chroot are properly set up)
Download PR-DNSd

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