#! /usr/bin/env bash set -e action="$1" LEGACY_KEYS_DIR="/opt/dnscrypt-wrapper/etc/keys" KEYS_DIR="/opt/encrypted-dns/etc/keys" CONF_DIR="/opt/encrypted-dns/etc" CONFIG_FILE="${CONF_DIR}/encrypted-dns.toml" CONFIG_FILE_TEMPLATE="${CONF_DIR}/encrypted-dns.toml.in" # -N provider-name -E external-ip-address:port init() { if [ "$(is_initialized 2>/dev/null)" = yes ]; then start exit $? fi while getopts "h?N:E:T:" opt; do case "$opt" in h | \?) usage ;; N) provider_name=$(echo "$OPTARG" | sed -e 's/^[ \t]*//' | tr A-Z a-z) ;; E) ext_address=$(echo "$OPTARG" | sed -e 's/^[ \t]*//' | tr A-Z a-z) ;; T) tls_proxy_upstream_address=$(echo "$OPTARG" | sed -e 's/^[ \t]*//' | tr A-Z a-z) ;; esac done [ -z "$provider_name" ] && usage case "$provider_name" in .*) usage ;; 2.dnscrypt-cert.*) ;; *) provider_name="2.dnscrypt-cert.${provider_name}" ;; esac [ -z "$ext_address" ] && usage case "$ext_address" in .*) usage ;; 0.*) echo "Do not use 0.0.0.0, use an actual external IP address" >&2 exit 1 ;; esac tls_proxy_configuration="" if [ -n "$tls_proxy_upstream_address" ]; then tls_proxy_configuration="upstream_addr = \"${tls_proxy_upstream_address}\"" fi echo "Provider name: [$provider_name]" echo "$provider_name" >"${KEYS_DIR}/provider_name" chmod 644 "${KEYS_DIR}/provider_name" sed \ -e "s/@PROVIDER_NAME@/${provider_name}/" \ -e "s/@EXTERNAL_IPV4@/${ext_address}/" \ -e "s/@TLS_PROXY_CONFIGURATION@/${tls_proxy_configuration}/" \ "$CONFIG_FILE_TEMPLATE" >"$CONFIG_FILE" /opt/encrypted-dns/sbin/encrypted-dns \ --config "$CONFIG_FILE" --dry-run | tee "${KEYS_DIR}/provider-info.txt" echo echo ----------------------------------------------------------------------- echo echo "Congratulations! The container has been properly initialized." echo "Take a look up above at the way dnscrypt-proxy has to be configured in order" echo "to connect to your resolver. Then, start the container with the default command." } provider_info() { ensure_initialized echo cat "${KEYS_DIR}/provider-info.txt" echo } dnscrypt_wrapper_compat() { if [ ! -d "$LEGACY_KEYS_DIR" ]; then echo "Neither [${KEYS_DIR}] doesn't seem to contain the required DNS provider information, and a [${LEGACY_KEYS_DIR}] directory wasn't found either" >&2 return 1 fi echo "Legacy [$LEGACY_KEYS_DIR] directory found" >&2 if [ -d "${KEYS_DIR}/provider_name" ]; then echo "Both [${LEGACY_KEYS_DIR}] and [${KEYS_DIR}] are present and not empty - This is not expected." >&2 return 1 fi if [ ! -f "${LEGACY_KEYS_DIR}/secret.key" ]; then echo "No secret key in [${LEGACY_KEYS_DIR}/secret.key], this is not expected." >&2 echo >&2 echo "If you are migrating from a container previously running dnscrypt-wrapper," >&2 echo "make sure that the [${LEGACY_KEYS_DIR}] directory is mounted." >&2 echo >&2 echo "If you are setting up a brand new server, maybe you've been following" >&2 echo "an outdated tutorial." >&2 echo >&2 echo "The key directory should be mounted as [${KEYS_DIR}] and not [$LEGACY_KEYS_DIR]." >&2 return 1 fi echo "...and this is fine! You can keep using it, no need to change anything to your Docker volumes." >&2 echo "We'll just copy a few things to [${KEYS_DIR}] internally" >&2 find "$KEYS_DIR" -type f -print -exec cp -afv {} "$LEGACY_KEYS_DIR/" \; chmod 700 "$LEGACY_KEYS_DIR" chown -R _encrypted-dns:_encrypted-dns "$LEGACY_KEYS_DIR" echo "...and update the configuration file" >&2 sed -e "s#${KEYS_DIR}#${LEGACY_KEYS_DIR}#g" <"$CONFIG_FILE_TEMPLATE" >"${CONFIG_FILE_TEMPLATE}.tmp" && mv -f "${CONFIG_FILE_TEMPLATE}.tmp" "$CONFIG_FILE_TEMPLATE" || exit 1 provider_name=$(cat "${LEGACY_KEYS_DIR}/provider_name") if [ -f "${LEGACY_KEYS_DIR}/provider-info.txt" ]; then ext_address=$(grep -F -- "--resolver-address=" "${LEGACY_KEYS_DIR}/provider-info.txt" 2>/dev/null | cut -d'=' -f2 | sed 's/ //g') fi if [ -z "$ext_address" ]; then echo "(we were not able to find the previous external IP address, the printed stamp will be wrong, but the previous stamp will keep working)" >&2 ext_address="0.0.0.0:443" fi sed \ -e "s/@PROVIDER_NAME@/${provider_name}/" \ -e "s/@EXTERNAL_IPV4@/${ext_address}/" \ "$CONFIG_FILE_TEMPLATE" >"$CONFIG_FILE" echo "...and check that everything's fine..." >&2 /opt/encrypted-dns/sbin/encrypted-dns \ --config "$CONFIG_FILE" \ --import-from-dnscrypt-wrapper "${LEGACY_KEYS_DIR}/secret.key" \ --dry-run >/dev/null || exit 1 chmod 600 "${LEGACY_KEYS_DIR}/secret.key" echo "Done!" >&2 echo >&2 export KEYS_DIR="$LEGACY_KEYS_DIR" } is_initialized() { if [ ! -f "${KEYS_DIR}/encrypted-dns.state" ] || [ ! -f "${KEYS_DIR}/provider-info.txt" ] || [ ! -f "${KEYS_DIR}/provider_name" ]; then if dnscrypt_wrapper_compat; then if [ ! -f "${KEYS_DIR}/encrypted-dns.state" ] || [ ! -f "${KEYS_DIR}/provider_name" ]; then echo no else echo yes fi else echo no fi else echo yes fi } ensure_initialized() { if [ "$(is_initialized)" = no ]; then if [ -d "$LEGACY_KEYS_DIR" ]; then echo "Please provide an initial configuration (init -N -E )" >&2 fi exit 1 fi } start() { ensure_initialized /opt/encrypted-dns/sbin/encrypted-dns \ --config "$CONFIG_FILE" --dry-run | tee "${KEYS_DIR}/provider-info.txt" exec /etc/runit/2 /dev/null 2>/dev/null } shell() { exec /bin/bash } usage() { cat < -E : initialize the container for a server accessible at ip on port , for a provider named . This is required only once. If TLS connections to the same port have to be redirected to a HTTPS server (e.g. for DoH), add -T : * start (default command): start the resolver and the dnscrypt server proxy. Ports 443/udp and 443/tcp have to be publicly exposed. * provider-info: prints the provider name and provider public key. * shell: run a shell. This container has a single volume that you might want to securely keep a backup of: /opt/encrypted-dns/etc/keys EOT exit 1 } case "$action" in start) start ;; init) shift init "$@" ;; provider-info) provider_info ;; shell) shell ;; *) usage ;; esac