Ubuntu 下使用 DNS over TLS (DoT)
DNS over TLS（縮寫：DoT）是通過傳輸層安全協定（TLS）來加密並打包域名系統（DNS）的安全協定。此協定旨在防止中間人攻擊與控制DNS資料以保護使用者隱私。引用自 Wikipedia – DNS over TLS，但是 DNS query 的效能會掉，而且是倍數的XD。
安裝及設定 stubby
以 Ubuntu 為例，設定檔位置為：/etc/stubby/stubby.yml （以下懶惰寫法）：
resolution_type: GETDNS_RESOLUTION_STUB
dns_transport_list:
- GETDNS_TRANSPORT_TLS
tls_authentication: GETDNS_AUTHENTICATION_REQUIRED
listen_addresses:
- 192.168.2.11
- 127.0.0.1
- 0::1
round_robin_upstreams: 0
upstream_recursive_servers:
- address_data: 1.1.1.1
tls_auth_name: "cloudflare-dns.com"
- address_data: 1.0.0.1
tls_auth_name: "cloudflare-dns.com"
- address_data: 2606:4700:4700::1111
tls_auth_name: "cloudflare-dns.com"
- address_data: 2606:4700:4700::1001
tls_auth_name: "cloudflare-dns.com"加密 key
跑一段時間之後 Stubby 會幫忙取得 sha256 的 key
修改 systemd-resolve
sudo vim /etc/systemd/resolved.conf
--------
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# Entries in this file show the compile time defaults.
# You can change settings by editing this file.
# Defaults can be restored by simply deleting this file.
#
# See resolved.conf(5) for details
[Resolve]
DNS=127.0.0.1
#FallbackDNS=
#Domains=
#LLMNR=no
#MulticastDNS=no
#DNSSEC=no
#DNSSEC=yes
#Cache=yes
#DNSStubListener=yes驗證（收割）DoT
dig @127.0.0.1 www.google.com
; <<>> DiG 9.11.3-1ubuntu1.13-Ubuntu <<>> @127.0.0.1 www.google.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16028
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; PAD: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 (".....................................................................................................................................................................................................................................................................................................................................................................................................................")
;; QUESTION SECTION:
;www.google.com. IN A
;; ANSWER SECTION:
www.google.com. 60 IN A 172.217.160.100
;; Query time: 5 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Dec 22 23:18:47 CST 2020
;; MSG SIZE rcvd: 482
DoT 連 853 port 狀況
netstat -tuWc | grep 853
tcp 0 0 host:88387 one.one.one.one:853 ESTABLISHED
tcp 0 0 host:38788 one.one.one.one:853 ESTABLISHED
tcp6 0 0 2001-b011-0000-0000-0000-0-0-0.dynamic-ip6.hinet.net:54386 one.one.one.one:853 ESTABLISHED
tcp6 0 0 2001-b011-0000-0000-0000-0-0-0.dynamic-ip6.hinet.net:38372 one.one.one.one:853 ESTABLISHED