docker-letsencrypt-nginx-proxy-companion/app/letsencrypt_service

#!/bin/bash

# shellcheck source=functions.sh
source /app/functions.sh

seconds_to_wait=3600
ACME_CA_URI="${ACME_CA_URI:-https://acme-v02.api.letsencrypt.org/directory}"
ACME_CA_TEST_URI="https://acme-staging-v02.api.letsencrypt.org/directory"
DEFAULT_KEY_SIZE="${DEFAULT_KEY_SIZE:-4096}"
RENEW_PRIVATE_KEYS="$(lc "${RENEW_PRIVATE_KEYS:-true}")"

function create_link {
    local -r source=${1?missing source argument}
    local -r target=${2?missing target argument}
    if [[ -f "$target" ]] && [[ "$(readlink "$target")" == "$source" ]]; then
      set_ownership_and_permissions "$target"
      [[ "$DEBUG" == 1 ]] && echo "$target already linked to $source"
      return 1
    else
      ln -sf "$source" "$target" \
        && set_ownership_and_permissions "$target"
    fi
}

function create_links {
    local -r base_domain=${1?missing base_domain argument}
    local -r domain=${2?missing base_domain argument}

    if [[ ! -f "/etc/nginx/certs/$base_domain/fullchain.pem" || \
          ! -f "/etc/nginx/certs/$base_domain/key.pem" ]]; then
        return 1
    fi
    local return_code=1
    create_link "./$base_domain/fullchain.pem" "/etc/nginx/certs/$domain.crt"
    return_code=$(( return_code & $? ))
    create_link "./$base_domain/key.pem" "/etc/nginx/certs/$domain.key"
    return_code=$(( return_code & $? ))
    if [[ -f "/etc/nginx/certs/dhparam.pem" ]]; then
        create_link ./dhparam.pem "/etc/nginx/certs/$domain.dhparam.pem"
        return_code=$(( return_code & $? ))
    fi
    if [[ -f "/etc/nginx/certs/$base_domain/chain.pem" ]]; then
        create_link "./$base_domain/chain.pem" "/etc/nginx/certs/$domain.chain.pem"
        return_code=$(( return_code & $? ))
    fi
    return $return_code
}

function cleanup_links {
    local -a LETSENCRYPT_CONTAINERS
    local -a LETSENCRYPT_STANDALONE_CERTS
    local -a ENABLED_DOMAINS
    local -a SYMLINKED_DOMAINS
    local -a DISABLED_DOMAINS

    # Create an array containing domains for which a
    # symlinked private key exists in /etc/nginx/certs.
    for symlinked_domain in /etc/nginx/certs/*.crt; do
        [[ -L "$symlinked_domain" ]] || continue
        symlinked_domain="${symlinked_domain##*/}"
        symlinked_domain="${symlinked_domain%*.crt}"
        SYMLINKED_DOMAINS+=("$symlinked_domain")
    done
    [[ "$DEBUG" == 1 ]] && echo "Symlinked domains: ${SYMLINKED_DOMAINS[*]}"

    # Create an array containing domains that are considered
    # enabled (ie present on /app/letsencrypt_service_data or /app/letsencrypt_user_data).
    [[ -f /app/letsencrypt_service_data ]] && source /app/letsencrypt_service_data
    [[ -f /app/letsencrypt_user_data ]] && source /app/letsencrypt_user_data
    LETSENCRYPT_CONTAINERS+=( "${LETSENCRYPT_STANDALONE_CERTS[@]}" )
    for cid in "${LETSENCRYPT_CONTAINERS[@]}"; do
      host_varname="LETSENCRYPT_${cid}_HOST"
      hosts_array="${host_varname}[@]"
      for domain in "${!hosts_array}"; do
        # Add domain to the array storing currently enabled domains.
        ENABLED_DOMAINS+=("$domain")
      done
    done
    [[ "$DEBUG" == 1 ]] && echo "Enabled domains: ${ENABLED_DOMAINS[*]}"

    # Create an array containing only domains for which a symlinked private key exists
    # in /etc/nginx/certs but that no longer have a corresponding LETSENCRYPT_HOST set
    # on an active container or on /app/letsencrypt_user_data
    if [[ ${#SYMLINKED_DOMAINS[@]} -gt 0 ]]; then
        mapfile -t DISABLED_DOMAINS < <(echo "${SYMLINKED_DOMAINS[@]}" \
                                             "${ENABLED_DOMAINS[@]}" \
                                             "${ENABLED_DOMAINS[@]}" \
                                             | tr ' ' '\n' | sort | uniq -u)
    fi
    [[ "$DEBUG" == 1 ]] && echo "Disabled domains: ${DISABLED_DOMAINS[*]}"


    # Remove disabled domains symlinks if present.
    # Return 1 if nothing was removed and 0 otherwise.
    if [[ ${#DISABLED_DOMAINS[@]} -gt 0 ]]; then
      [[ "$DEBUG" == 1 ]] && echo "Some domains are disabled :"
      for disabled_domain in "${DISABLED_DOMAINS[@]}"; do
          [[ "$DEBUG" == 1 ]] && echo "Checking domain ${disabled_domain}"
          cert_folder="$(readlink -f "/etc/nginx/certs/${disabled_domain}.crt")"
          # If the dotfile is absent, skip domain.
          if [[ ! -e "${cert_folder%/*}/.companion" ]]; then
              [[ "$DEBUG" == 1 ]] && echo "No .companion file found in ${cert_folder}. ${disabled_domain} is not managed by letsencrypt-nginx-proxy-companion. Skipping domain."
              continue
          else
              [[ "$DEBUG" == 1 ]] && echo "${disabled_domain} is managed by letsencrypt-nginx-proxy-companion. Removing unused symlinks."
          fi

          for extension in .crt .key .dhparam.pem .chain.pem; do
              file="${disabled_domain}${extension}"
              if [[ -n "${file// }" ]] && [[ -L "/etc/nginx/certs/${file}" ]]; then
                  [[ "$DEBUG" == 1 ]] && echo "Removing /etc/nginx/certs/${file}"
                  rm -f "/etc/nginx/certs/${file}"
              fi
          done
      done
      return 0
    else
      return 1
    fi
}

function update_cert {
    local cid="${1:?}"
    # Derive host and email variable names
    local host_varname="LETSENCRYPT_${cid}_HOST"
    # Array variable indirection hack: http://stackoverflow.com/a/25880676/350221
    local -a hosts_array="${host_varname}[@]"
    local hosts_array_expanded=("${!hosts_array}")
    # First domain will be our base domain
    local base_domain="${hosts_array_expanded[0]}"

    local should_restart_container='false'

    local -a params_d_arr

    local keysize_varname="LETSENCRYPT_${cid}_KEYSIZE"
    local cert_keysize="${!keysize_varname:-"<no value>"}"
    if [[ "$cert_keysize" == "<no value>" ]] || \
        [[ ! "$cert_keysize" =~ ^(2048|3072|4096|8192|ec-256|ec-384)$ ]]; then
        cert_keysize=$DEFAULT_KEY_SIZE
    fi

    local test_certificate_varname="LETSENCRYPT_${cid}_TEST"
    local acme_ca_uri certificate_dir
    if [[ $(lc "${!test_certificate_varname:-}") == true ]] || \
        [[ "$ACME_CA_URI" == "$ACME_CA_TEST_URI" ]]; then
        # Use staging Let's Encrypt ACME end point
        acme_ca_uri="$ACME_CA_TEST_URI"
        # Prefix test certificate directory with _test_
        certificate_dir="/etc/nginx/certs/_test_$base_domain"
    else
        # Use default or user provided ACME end point
        acme_ca_uri="$ACME_CA_URI"
        certificate_dir="/etc/nginx/certs/$base_domain"
    fi

    local config_varname="LETSENCRYPT_${cid}_ACMESH_CONFIG"
    local config_name="${!config_varname:-"<no value>"}"
    if [[ "$config_name" == "<no value>" ]]; then
        config_name=default
    else
        [[ ! -d "/etc/acme.sh/$config_name" ]] && mkdir -p "/etc/acme.sh/$config_name"
    fi

    [[ "$DEBUG" == 1 ]] && params_d_arr+=("--debug")
    [[ "$RENEW_PRIVATE_KEYS" == true ]] && params_d_arr+=("--always-force-new-domain-key")
    [[ "${2:-}" == "--force-renew" ]] && params_d_arr+=("--force")

    # Create directory for the first domain
    mkdir -p "$certificate_dir"
    set_ownership_and_permissions "$certificate_dir"

    for domain in "${!hosts_array}"; do
        # Add all the domains to certificate
        params_d_arr+=("--domain" "$domain")
        # Add location configuration for the domain
        add_location_configuration "$domain" || reload_nginx
    done

    echo "Creating/renewal $base_domain certificates... (${hosts_array_expanded[*]})"
    acme.sh --issue \
            --log /dev/null \
            --config-home "/etc/acme.sh/$config_name" \
            "${params_d_arr[@]}" \
            --keylength "$cert_keysize" \
            --server "$acme_ca_uri" \
            --webroot /usr/share/nginx/html \
            --cert-file "${certificate_dir}/cert.pem" \
            --key-file "${certificate_dir}/key.pem" \
            --ca-file "${certificate_dir}/chain.pem" \
            --fullchain-file "${certificate_dir}/fullchain.pem"

    local acmesh_return=$?

    # 0 = success, 2 = RENEW_SKIP
    if [[ $acmesh_return == 0 || $acmesh_return == 2 ]]; then
        for domain in "${!hosts_array}"; do
        if [[ $acme_ca_uri =~ ^https://acme-staging.* ]]; then
            create_links "_test_$base_domain" "$domain" && should_reload_nginx='true' && should_restart_container='true'
        else
            create_links "$base_domain" "$domain" && should_reload_nginx='true' && should_restart_container='true'
        fi
        done
        touch "${certificate_dir}/.companion"
        set_ownership_and_permissions "${certificate_dir}/.companion"
        # Make private key root readable only
        for file in cert.pem key.pem chain.pem fullchain.pem; do
        local file_path="${certificate_dir}/${file}"
        [[ -e "$file_path" ]] && set_ownership_and_permissions "$file_path"
        done
        # Queue nginx reload if a certificate was issued or renewed
        [[ $acmesh_return -eq 0 ]] && should_reload_nginx='true' && should_restart_container='true'
    fi

    # Restart container if certs are updated and the respective environmental variable is set
    local restart_container_var="LETSENCRYPT_${cid}_RESTART_CONTAINER"
    if [[ $(lc "${!restart_container_var:-}") == true ]] && [[ "$should_restart_container" == 'true' ]]; then
        echo "Restarting container (${cid})..."
        docker_restart "${cid}"
    fi

    for domain in "${!hosts_array}"; do
        if [[ -f "/etc/nginx/conf.d/standalone-cert-$domain.conf" ]]; then
            [[ "$DEBUG" == 1 ]] && echo "Debug: removing standalone configuration file /etc/nginx/conf.d/standalone-cert-$domain.conf"
            rm -f "/etc/nginx/conf.d/standalone-cert-$domain.conf" && should_reload_nginx='true'
        fi
    done

}

function update_certs {
    local -a LETSENCRYPT_CONTAINERS
    local -a LETSENCRYPT_STANDALONE_CERTS

    pushd /etc/nginx/certs > /dev/null || return
    check_nginx_proxy_container_run || return

    # Load relevant container settings
    if [[ -f /app/letsencrypt_service_data ]]; then
        source /app/letsencrypt_service_data
    else
        echo "Warning: /app/letsencrypt_service_data not found, skipping data from containers."
    fi

    # Load settings for standalone certs
    if [[ -f /app/letsencrypt_user_data ]]; then
        if source /app/letsencrypt_user_data; then
            for cid in "${LETSENCRYPT_STANDALONE_CERTS[@]}"; do
                host_varname="LETSENCRYPT_${cid}_HOST"
                hosts_array="${host_varname}[@]"
                for domain in "${!hosts_array}"; do
                    add_standalone_configuration "$domain"
                done
            done
            reload_nginx
            LETSENCRYPT_CONTAINERS+=( "${LETSENCRYPT_STANDALONE_CERTS[@]}" )
        else
            echo "Warning: could not source /app/letsencrypt_user_data, skipping user data"
        fi
    fi

    should_reload_nginx='false'
    for cid in "${LETSENCRYPT_CONTAINERS[@]}"; do
        # Pass the eventual --force-renew arg to update_cert() as second arg
        update_cert "$cid" "${1:-}"
    done

    cleanup_links && should_reload_nginx='true'

    [[ "$should_reload_nginx" == 'true' ]] && reload_nginx

    popd > /dev/null || return
}

# Allow the script functions to be sourced without starting the Service Loop.
if [ "${1}" == "--source-only" ]; then
  return 0
fi

pid=
# Service Loop: When this script exits, start it again.
trap '[[ $pid ]] && kill $pid; exec $0' EXIT
trap 'trap - EXIT' INT TERM

update_certs "$@"

# Wait some amount of time
echo "Sleep for ${seconds_to_wait}s"
sleep $seconds_to_wait & pid=$!
wait
pid=