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aproxy - transparent proxy for HTTP and HTTPS/TLS

Aproxy is a transparent proxy for HTTP and HTTPS/TLS connections. By pre-reading the Host header in HTTP requests and the SNI in TLS client hellos, it forwards HTTP proxy requests with the hostname, therefore, complies with HTTP proxies requiring destination hostname for auditing or access control.

Usage

Install aproxy using snap, and configure the upstream http proxy.

sudo snap install aproxy --edge
sudo snap set aproxy proxy=squid.internal:3128

Create the following nftables rules to redirect outbound traffic to aproxy on the same machine. Please note that aproxy for now only works with IPv4, supporting only HTTP on port 80 and HTTPS/TLS on port 443.

sudo nft -f - << EOF
define default-ip = $(ip route get $(ip route show 0.0.0.0/0 | grep -oP 'via \K\S+') | grep -oP 'src \K\S+')
define private-ips = { 10.0.0.0/8, 127.0.0.1/8, 172.16.0.0/12, 192.168.0.0/16 }
table ip aproxy
flush table ip aproxy
table ip aproxy {
        chain prerouting {
                type nat hook prerouting priority dstnat; policy accept;
                ip daddr != \$private-ips tcp dport { 80, 443 } counter dnat to \$default-ip:8443
        }

        chain output {
                type nat hook output priority -100; policy accept;
                ip daddr != \$private-ips tcp dport { 80, 443 } counter dnat to \$default-ip:8443
        }
}
EOF

You can inspect the access logs of aproxy using:

sudo snap logs aproxy.aproxy -n=all

Running from Source

To run this application directly from the source code, you'll need to have Go 1.21 installed on your system.

Follow these steps to get started:

git clone https://github.com/canonical/aproxy.git
cd aproxy
go mod download
go run . --proxy=squid.internal:3128