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docs:guide-user:services:dns:doh_dnsmasq_https-dns-proxy
Table of Contents
DNS over HTTPS with Dnsmasq and https-dns-proxy
Introduction
- This how-to describes the method for setting up DNS over HTTPS on OpenWrt.
- It relies on Dnsmasq and https-dns-proxy for masking DNS traffic as HTTPS traffic.
- Follow DNS encryption for alternative methods or use VPN to protect all traffic.
Goals
- Encrypt your DNS traffic improving security and privacy.
- Prevent DNS leak and DNS hijacking.
- Bypass regional restrictions using public DNS providers.
- Escape DNS-based content filters and internet censorship.
Instructions
Enable split DNS mode to encrypt LAN client DNS traffic assuming that local system traffic does not involve private data.
Use https-dns-proxy to encrypt DNS traffic. Configure Dnsmasq to forward DNS queries to https-dns-proxy. Enforce DNS encryption for LAN clients to avoid DNS leak.
# Install packages opkg update opkg install dnsmasq https_dns_proxy # Enable DNS encryption uci -q delete dhcp.@dnsmasq[0].server DOHPROXY_ADDR="$(uci get https_dns_proxy.@https_dns_proxy[0].listen_addr)" DOHPROXY_PORT="$(uci get https_dns_proxy.@https_dns_proxy[0].listen_port)" DOHPROXY_SERV="${DOHPROXY_ADDR//[][]/}#${DOHPROXY_PORT}" uci add_list dhcp.@dnsmasq[0].server="${DOHPROXY_SERV}" # Enforce DNS encryption for LAN clients uci set dhcp.@dnsmasq[0].noresolv="1" uci commit dhcp /etc/init.d/dnsmasq restart # Start the https_dns_proxy plugin /etc/init.d/https_dns_proxy enable /etc/init.d/https_dns_proxy start
Testing
Verify that domain name resolution works.
nslookup openwrt.org localhost
Check your DNS provider. Make sure there is no DNS leak.
Test DNSSEC validation.
Troubleshooting
Collect and analyze the following information.
# Restart the services /etc/init.d/log restart; /etc/init.d/dnsmasq restart; /etc/init.d/https_dns_proxy restart # Log and status logread -e dnsmasq; netstat -l -n -p | grep -e dnsmasq logread -e https_dns_proxy; netstat -l -n -p | grep -e https_dns # Runtime configuration pgrep -f -a dnsmasq; pgrep -f -a https_dns_proxy # Persistent configuration uci show dhcp; uci show https_dns_proxy
Extras
Web interface
Install the necessary packages if you want to manage the settings via web interface.
# Install packages opkg update opkg install luci-app-https_dns_proxy
DoH provider
https-dns-proxy is configured with Google DNS by default. You can change it to another DoH provider. Make sure selected provider supports DNSSEC validation if required. Specify several servers to improve fault tolerance.
# Configure DoH provider while uci -q delete https_dns_proxy.@https_dns_proxy[0]; do :; done uci set https_dns_proxy.dns="https_dns_proxy" uci set https_dns_proxy.dns.listen_addr="127.0.0.1" uci set https_dns_proxy.dns.listen_port="5053" uci set https_dns_proxy.dns.user="nobody" uci set https_dns_proxy.dns.group="nogroup" uci set https_dns_proxy.dns.url_prefix="https://cloudflare-dns.com/dns-query?ct=application/dns-json&" uci commit https_dns_proxy /etc/init.d/https_dns_proxy restart
Local system
Local system does not use Dnsmasq as a primary resolver when DNS encryption is enabled. Enforce Dnsmasq as a primary resolver to provide DNS encryption for local system. Bypass DNS encryption for NTP provider to avoid deadlock state when system time is not synchronized. Beware of race condition with Adblock service.
# Enforce DNS encryption for local system uci set dhcp.@dnsmasq[0].localuse="1" # Fetch DNS provider . /lib/functions/network.sh network_flush_cache network_find_wan NET_IF network_find_wan6 NET_IF6 network_get_dnsserver NET_DNS "${NET_IF}" network_get_dnsserver NET_DNS6 "${NET_IF6}" # Bypass DNS encryption for NTP provider uci get system.ntp.server \ | sed -e "s/\s/\n/g" \ | sed -e "s/^[0-9]*\.//" \ | sort -u \ | while read -r NTP_DOMAIN do uci add_list dhcp.@dnsmasq[0].server="/${NTP_DOMAIN}/${NET_DNS%% *}" uci add_list dhcp.@dnsmasq[0].server="/${NTP_DOMAIN}/${NET_DNS6%% *}" done uci commit dhcp /etc/init.d/dnsmasq restart
docs/guide-user/services/dns/doh_dnsmasq_https-dns-proxy.txt · Last modified: 2019/10/11 22:42 by stansmith
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