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For general information about DNS stamps, see https://dnscrypt.info/stamps-specifications

Installation

python3 -m pip install --user dnsstamps

Generating DNS stamps

DNSCrypt

First get the public key, if you use dnsdist, you can get it in this way

> printDNSCryptProviderFingerprint("/path/to/your/providerPublic.key")
Provider fingerprint is: CB6A:DC5C:29F9:5510:0B65:BF12:94FE:5684:579A:B349:9CC9:798F:00D0:1BB5:C1A9:A2C7

Then run

$ dnsstamp.py dnscrypt -s -a 127.0.0.1 -n 2.dnscrypt-cert.example.com -k CB6A:DC5C:29F9:5510:0B65:BF12:94FE:5684:579A:B349:9CC9:798F:00D0:1BB5:C1A9:A2C7
DNSCrypt DNS stamp
==================

DNSSEC: yes
No logs: no
No filter: no
IP Address: 127.0.0.1
Public key: CB6A:DC5C:29F9:5510:0B65:BF12:94FE:5684:579A:B349:9CC9:798F:00D0:1BB5:C1A9:A2C7
Provider name: 2.dnscrypt-cert.example.com

sdns://AQEAAAAAAAAACTEyNy4wLjAuMSDLatxcKflVEAtlvxKU_laEV5qzSZzJeY8A0Bu1wamixxsyLmRuc2NyeXB0LWNlcnQuZXhhbXBsZS5jb20

DNS-over-HTTPS

First get your certificate's signed data hash (tbsCertificate)

$ openssl asn1parse -in doh.example.com.chain.pem -out /dev/stdout -noout -strparse 4 | openssl dgst -sha256
(stdin)= 3e1a1a0f6c53f3e97a492d57084b5b9807059ee057ab1505876fd83fda3db838

Then run

$ dnsstamp.py doh -s -a 127.0.0.1 -n doh.example.com -p /dns-query -t 3e1a1a0f6c53f3e97a492d57084b5b9807059ee057ab1505876fd83fda3db838
DoH DNS stamp
=============

DNSSEC: yes
No logs: no
No filter: no
IP Address: 127.0.0.1
Hashes: ['3e1a1a0f6c53f3e97a492d57084b5b9807059ee057ab1505876fd83fda3db838']
Hostname: doh.example.com
Path: /dns-query
Bootstrap IPs: []

sdns://AgEAAAAAAAAACTEyNy4wLjAuMSA-GhoPbFPz6XpJLVcIS1uYBwWe4FerFQWHb9g_2j24OA9kb2guZXhhbXBsZS5jb20KL2Rucy1xdWVyeQ

DNS-over-TLS

First get your certificate's signed data hash (tbsCertificate)

$ openssl asn1parse -in dot.example.com.chain.pem -out /dev/stdout -noout -strparse 4 | openssl dgst -sha256
(stdin)= 2f1af500a66d4b83760766e41cb1123ebd6b95853afaef3bcdf39cbde3ab30b6

Then run

$ dnsstamp.py dot -s -a 127.0.0.1 -n dot.example.com -t 2f1af500a66d4b83760766e41cb1123ebd6b95853afaef3bcdf39cbde3ab30b6
DoT DNS stamp
=============

DNSSEC: yes
No logs: no
No filter: no
IP Address: 127.0.0.1
Hostname: dot.example.com
Hashes: ['2f1af500a66d4b83760766e41cb1123ebd6b95853afaef3bcdf39cbde3ab30b6']
Bootstrap IPs: []

sdns://AwEAAAAAAAAACTEyNy4wLjAuMSAvGvUApm1Lg3YHZuQcsRI-vWuVhTr67zvN85y946swtg9kb3QuZXhhbXBsZS5jb20

DNS-over-QUIC

First get your certificate's signed data hash (tbsCertificate)

$ openssl asn1parse -in doq.example.com.chain.pem -out /dev/stdout -noout -strparse 4 | openssl dgst -sha256
(stdin)= 2449d49a44b91e80e0c71eeab76627579b6d4e53b4445cd5479004cc93d23263

Then run

$ dnsstamp.py doq -s -a 127.0.0.1 -n doq.example.com -t 2449d49a44b91e80e0c71eeab76627579b6d4e53b4445cd5479004cc93d23263
DoQ DNS stamp
=============

DNSSEC: yes
No logs: no
No filter: no
IP Address: 127.0.0.1
Hostname: doq.example.com
Hashes: ['2449d49a44b91e80e0c71eeab76627579b6d4e53b4445cd5479004cc93d23263']
Bootstrap IPs: []

sdns://BAEAAAAAAAAACTEyNy4wLjAuMSAkSdSaRLkegODHHuq3ZidXm21OU7REXNVHkATMk9IyYw9kb3EuZXhhbXBsZS5jb20

Oblivious DoH target

$ dnsstamp.py doh_target -s -a 127.0.0.1 -n doh-target.example.com -p /dns-query
DoH Target DNS stamp
====================

DNSSEC: yes
No logs: no
No filter: no
Hostname: doh-target.example.com
Path: /dns-query

sdns://BQEAAAAAAAAAFmRvaC10YXJnZXQuZXhhbXBsZS5jb20KL2Rucy1xdWVyeQ

Anonymized DNSCrypt relay

$ dnsstamp.py dnscrypt_relay -a 127.0.0.1
DNSCrypt DNS Relay Stamp
========================

IP Address: 127.0.0.1

sdns://gQkxMjcuMC4wLjE

Oblivious DoH relay

First get your certificate's signed data hash (tbsCertificate)

$ openssl asn1parse -in doh.example.com.chain.pem -out /dev/stdout -noout -strparse 4 | openssl dgst -sha256
(stdin)= 3e1a1a0f6c53f3e97a492d57084b5b9807059ee057ab1505876fd83fda3db838

Then run

$ dnsstamp.py doh_relay -a 127.0.0.1 -n doh-relay.example.com -p /dns-query -t 3e1a1a0f6c53f3e97a492d57084b5b9807059ee057ab1505876fd83fda3db838
DoH Relay DNS stamp
===================

DNSSEC: no
No logs: no
No filter: no
IP Address: 127.0.0.1
Hashes: ['3e1a1a0f6c53f3e97a492d57084b5b9807059ee057ab1505876fd83fda3db838']
Hostname: doh-relay.example.com
Path: /dns-query
Bootstrap IPs: []

sdns://hQAAAAAAAAAACTEyNy4wLjAuMSA-GhoPbFPz6XpJLVcIS1uYBwWe4FerFQWHb9g_2j24OBVkb2gtcmVsYXkuZXhhbXBsZS5jb20KL2Rucy1xdWVyeQ

Plain DNS

$ dnsstamp.py plain -s -a 127.0.0.1
Plain DNS stamp
===============

DNSSEC: yes
No logs: no
No filter: no
IP Address: 127.0.0.1

sdns://AAEAAAAAAAAACTEyNy4wLjAuMQ

Parsing DNS stamps

$ dnsstamp.py parse sdns://AAEAAAAAAAAACTEyNy4wLjAuMQ
Plain DNS stamp
===============

DNSSEC: yes
No logs: no
No filter: no
IP Address: 127.0.0.1

sdns://AAEAAAAAAAAACTEyNy4wLjAuMQ

Using the library

import dnsstamps
from dnsstamps import Option

# DNSCrypt
stamp = dnsstamps.create_dnscrypt("127.0.0.1", "CB6A:DC5C", "provider-name", [Option.DNSSEC])

# DNS-over-HTTPS
stamp = dnsstamps.create_doh("127.0.0.1", ["3e1a1a0f"], "hostname", "path", [Option.NO_LOGS])

# DNS-over-TLS
stamp = dnsstamps.create_dot("127.0.0.1", ["d0b24377"], "hostname", [Option.NO_FILTERS])

# DNS-over-QUIC
stamp = dnsstamps.create_doq("127.0.0.1", ["e50ff421"], "hostname", [Option.NO_FILTERS])

# Oblivious DoH target
stamp = dnsstamps.create_doh_target("hostname", "path", [Option.NO_LOGS])

# Anonymized DNSCrypt relay
stamp = dnsstamps.create_dnscrypt_relay("127.0.0.1")

# Oblivious DoH relay
stamp = dnsstamps.create_doh_relay("127.0.0.1", ["3e1a1a0f"], "hostname", "path", [Option.NO_LOGS])

# Plain DNS
stamp = dnsstamps.create_plain("127.0.0.1", [Option.DNSSEC, Option.NO_LOGS, Option.NO_FILTERS])

# Parse
parameter = dnsstamps.parse("sdns://AAEAAAAAAAAACTEyNy4wLjAuMQ")
dnsstamps.format(parameter)
stamp = dnsstamps.build(parameter)

Running tests

python3 -m unittest discover

Setting up your own DNS server

  • Unbound (DNSSEC, DNSCrypt)
  • PowerDNS (DNSSEC, DNSCrypt, DoH, DoT, Authoritative Server)

Updating PyPI package

python3 setup.py sdist bdist_wheel
python3 -m twine upload dist/*