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Isolate cloudflared from my LAN network
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| networks: | |
| cloudflared-network: | |
| name: cloudflared-network | |
| driver: bridge | |
| ipam: | |
| config: | |
| - subnet: 10.0.1.0/24 | |
| gateway: 10.0.1.1 | |
| services: | |
| nginx-reverse-proxy: | |
| image: nginx:latest | |
| restart: unless-stopped | |
| container_name: nginx-reverse-proxy | |
| volumes: | |
| - ./nginx.conf:/etc/nginx/nginx.conf | |
| networks: | |
| cloudflared-network: | |
| ipv4_address: 10.0.1.3 | |
| cloudflared: | |
| image: cloudflare/cloudflared | |
| container_name: cloudflared | |
| restart: unless-stopped | |
| command: ["tunnel", "--no-autoupdate", "run"] | |
| environment: | |
| - TUNNEL_TOKEN=${TUNNEL_TOKEN} | |
| networks: | |
| cloudflared-network: | |
| ipv4_address: 10.0.1.2 | |
| depends_on: | |
| - nginx-reverse-proxy | |
| iptables: | |
| build: | |
| dockerfile_inline: | | |
| FROM alpine:latest | |
| # assume that the host is using iptables-nft, not iptables-legacy | |
| RUN apk update & apk add iptables | |
| container_name: iptables | |
| restart: unless-stopped | |
| cap_add: | |
| - NET_ADMIN | |
| network_mode: host | |
| configs: | |
| - source: block.sh | |
| target: /block.sh | |
| - source: unblock.sh | |
| target: /unblock.sh | |
| environment: | |
| - CLOUDFLARED_IP=10.0.1.2 | |
| - LAN_SUBNET=192.168.0.0/16 | |
| command: /bin/sh /block.sh | |
| depends_on: | |
| - cloudflared | |
| # inline file requires docker 2.23.1 | |
| configs: | |
| block.sh: | |
| content: | | |
| #! /bin/sh | |
| trap "/bin/sh /unblock.sh" INT TERM | |
| iptables -C DOCKER-USER -d $$LAN_SUBNET -s $$CLOUDFLARED_IP -j REJECT 2>/dev/null || \ | |
| iptables -I DOCKER-USER -d $$LAN_SUBNET -s $$CLOUDFLARED_IP -j REJECT | |
| iptables -C INPUT -s $$CLOUDFLARED_IP -j REJECT 2>/dev/null || \ | |
| iptables -I INPUT -s $$CLOUDFLARED_IP -j REJECT | |
| sleep infinity & | |
| wait | |
| unblock.sh: | |
| content: | | |
| #! /bin/sh | |
| iptables -C DOCKER-USER -d $$LAN_SUBNET -s $$CLOUDFLARED_IP -j REJECT 2>/dev/null &&\ | |
| iptables -D DOCKER-USER -d $$LAN_SUBNET -s $$CLOUDFLARED_IP -j REJECT | |
| iptables -C INPUT -s $$CLOUDFLARED_IP -j REJECT 2>/dev/null && \ | |
| iptables -D INPUT -s $$CLOUDFLARED_IP -j REJECT |
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