Merge pull request #36 from cerc-io/dboreham/tls-proxy

Initial version of automated TLS proxy

tls-proxy/README.md

@@ -0,0 +1,2 @@
+# tls-proxy
+Automated deployment of TLS reverse proxy provisioned with Let's Encrypt certificate

tls-proxy/docker-compose.yml

@@ -0,0 +1,27 @@
+services:
+
+    proxy:
+        image: nginx:stable-bullseye
+        command: "/bin/sh -c 'while :; do sleep 6h & wait $${!}; nginx -s reload; done & nginx -g \"daemon off;\"'"
+        ports:
+            - 80:80
+            - 443:443
+        volumes:
+            - ./nginx/nginx.conf:/etc/nginx/nginx.conf:ro
+            - ./certbot/challenge:/data/certbot-challenge:ro
+            - ./certbot/certificates:/data/certificates:ro
+
+    certbot:
+        image: certbot/certbot:v2.5.0
+        volumes: 
+            - ./certbot/certificates:/etc/letsencrypt
+            - ./certbot/challenge:/data-www-challenge
+        entrypoint: "/bin/sh -c 'sleep 300; trap exit TERM; while :; do certbot renew; sleep 12h & wait $${!}; done;'"
+
+    # Hello-world http container useful for test/debugging the proxy
+    # an actual service would be used for production
+    example-webservice:
+        image: crccheck/hello-world
+        ports:
+          - 8000
+

tls-proxy/initialize-tls-proxy.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+if [[ -n "$CERC_SCRIPT_DEBUG" ]]; then
+    set -x
+fi
+# TODO: get from the caller
+LACONIC_TLS_DOMAIN=example.com
+# When we're called nginx and certbot container are up and running and certbot is sleeping before executing renew
+# So we can now ask certbot to issue our initial cert
+tls_certificate_directory=./certbot/certificates/live/${LACONIC_TLS_DOMAIN}
+rm -rf ${tls_certificate_directory}
+# TODO: pass in email from caller
+# TODO: allow staging/dry-run mode
+docker compose exec certbot \
+    certbot certonly --webroot -w /data-www-challenge \
+    --staging \
+    --email ${EMAIL} \
+    -d ${LACONIC_TLS_DOMAIN} \
+    --rsa-key-size 4096 \
+    --agree-tos \
+    --force-renewal

tls-proxy/nginx-config-template

@@ -0,0 +1,39 @@
+events {
+    worker_connections  1024;
+}
+
+http {
+    server_tokens off;
+    charset utf-8;
+
+    server {
+        listen 80 default_server;
+
+        server_name _;
+
+        location ~ /.well-known/acme-challenge/ {
+            root /data/certbot-challenge;
+        }
+
+        location / {
+            proxy_pass http://webservice:8000/;
+        }
+    }
+
+    server {
+        listen 443 ssl http2;
+        ssl_certificate     /data/certificates/live/${LACONIC_TLS_DOMAIN}/fullchain.pem;
+        ssl_certificate_key /data/certificates/live/${LACONIC_TLS_DOMAIN}/privkey.pem;
+        server_name ${LACONIC_TLS_DOMAIN};
+        root /var/www/html;
+        index index.php index.html index.htm;
+
+        location / {
+            proxy_pass ${LACONIC_ORIGIN_SERVICE_URL};
+        }
+
+        location ~ /.well-known/acme-challenge/ {
+            root /data/certbot-challenge;
+        }
+    }
+}

tls-proxy/run-this-first.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+if [[ -n "$CERC_SCRIPT_DEBUG" ]]; then
+    set -x
+fi
+set -e
+mkdir -p ./nginx
+mkdir -p ./certbot/certificates
+mkdir -p ./certbot/challenge
+# TODO: get from the caller
+LACONIC_TLS_DOMAIN=example.com
+LACONIC_ORIGIN_SERVICE_URL=http://example-webservice:8000/
+# Expand the config template into the nginx config file
+cat ./nginx-config-template | sed 's/${LACONIC_TLS_DOMAIN}/'${LACONIC_TLS_DOMAIN}'/' | \
+	sed 's/${LACONIC_ORIGIN_SERVICE_URL}/'${LACONIC_ORIGIN_SERVICE_URL}'/' > ./nginx/nginx.conf
+# Create a self-signed cert so nginx will start without us changing its config between pre and post certbot invocation.
+# Check if we have a cert already
+tls_certificate_directory=./certbot/certificates/live/${LACONIC_TLS_DOMAIN}
+tls_certificate_directory_in_container=/etc/letsencrypt/live/${LACONIC_TLS_DOMAIN}
+tls_certificate_file_name=${tls_certificate_directory}/fullchain.pem
+# TODO: this won't work if there's a delay of more than one day between generating the 
+# self signed cert and starting the certbot enrollment process
+if [[ ! -f ${tls_certificate_file_name} ]] ; then
+    echo "Generating self-signed certificate for ${LACONIC_TLS_DOMAIN}:"
+    mkdir -p ${tls_certificate_directory}
+    docker compose run --rm --entrypoint "\
+        openssl req -x509 -nodes -newkey rsa:4096 -days 1 -keyout '${tls_certificate_directory_in_container}/privkey.pem' \
+        -out '${tls_certificate_directory_in_container}/fullchain.pem' -subj '/CN=${LACONIC_TLS_DOMAIN}'" certbot
+echo
+fi