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dnstrike

A small set of DNS utilities in the form of a weaponized DNS resolver. Use cases: SSRF exploitation, playing with DNS, anything you want.

Commands

  • <ip>.bind - resolves IPv4-like subdomain in the form of %d-%d-%d-%d to the IPv4 address, example: 1-1-1-1.bind.domain.tld resolves to 1.1.1.1
  • random - resolves to random IPv4 address, example: random.domain.tld returns a random IPv4 address
  • <subdomain>.as.<ip> - creates record to resolve subdomain name to the IPv4 address, example: testname.as.1-1-1-1.domain.tld resolves to 1.1.1.1
  • <subdomain>.lookup - returns created on the previous step IPv4 record for the subdomain, example: testname.lookup.domain.tld resolves to 1.1.1.1

See tests for more details.

Install

python3 -m venv venv
source venv/bin/activate
pip3 install -r requirements.txt

Run in Docker

Run:

make up

Check container status:

CONTAINER ID   IMAGE            COMMAND                  CREATED          STATUS                    PORTS                   NAMES
e353becd50f4   dnstrike:0.1.0   "python3 resolver.py…"   23 seconds ago   Up 22 seconds (healthy)   0.0.0.0:53->55053/udp   dnstrike

Test:

dig @127.0.0.1 1-2-3-4.bind.localhost

Expected output:

;; QUESTION SECTION:
;1-2-3-4.bind.localhost.                IN      A

;; ANSWER SECTION:
1-2-3-4.bind.localhost. 60      IN      A       1.2.3.4

;; Query time: 3 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sun Aug 07 00:47:58 +03 2022
;; MSG SIZE  rcvd: 56

Self-Host

Requirements: domain name, VPS or any available machine.

Create NS records so they will point to the resolver, example configuration:

Type: A, Name: ns1, Data: <machine (VPS) IP>
Type: A, Name: ns2, Data: <machine (VPS) IP>
Type: NS, Name: anything you want, Data: ns1.<domain.tld>
Type: NS, Name: anything you want, Data: ns2.<domain.tld>

Tests

make test

Expected output:

Ran 7 tests in 0.007s

OK