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Last active April 10, 2024 08:53
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CLI script to programmatically replace SSL certs on Synology NAS
# *** For DSM v7.x ***
# How to use this script:
# 1. Get your 3 PEM files ready to copy over from your local machine/update server (privkey.pem, fullchain.pem, cert.pem)
# and put into a directory (this will be $CERT_DIRECTORY).
# Personally, I use this script ( to automate steps 1 & 4.
# 2. Ensure you have a user setup on synology that has ssh access (and ssh access is setup).
# This user will need to be able to sudo as root (i.e. add this line to sudoers, <USER> is the user you create):
# <USER> ALL=(ALL) NOPASSWD: /var/services/homes/<USER>/
# 3. Copy this script to Synology: sudo scp $USER@$SYNOLOGY_SERVER:~/
# 4. Call this script as follows:
# sudo bash -c scp ${CERT_DIRECTORY}/{privkey,fullchain,cert}.pem $USER@$SYNOLOGY_SERVER:/tmp/ \
# && ssh $USER@$SYNOLOGY_SERVER 'sudo ./'
# Script start.
DEBUG= # Set to any non-empty value to turn on debug mode
error_exit() { echo "[ERROR] $1"; exit 1; }
warn() { echo "[WARN ] $1"; }
info() { echo "[INFO ] $1"; }
debug() { [[ "${DEBUG}" ]] && echo "[DEBUG ] $1"; }
# 1. Initialization
# =================
[[ "$EUID" -ne 0 ]] && error_exit "Please run as root" # Script only works as root
services_to_restart=("nmbd" "avahi" "ldap-server")
packages_to_restart=("ScsiTarget" "SynologyDrive" "WebDAVServer" "ActiveBackup")
# Add the default directory
if [[ -n "$default_dir_name" ]]; then
debug "Default cert directory found: '/usr/syno/etc/certificate/_archive/${default_dir_name}'"
warn "No default directory found. Probably unusual? Check: 'cat /usr/syno/etc/certificate/_archive/DEFAULT'"
# Add reverse proxy app directories
for proxy in /usr/syno/etc/certificate/ReverseProxy/*/; do
debug "Found proxy dir: ${proxy}"
[[ "${DEBUG}" ]] && set -x
# 2. Move and chown certificates from /tmp to default directory
# =============================================================
mv /tmp/{privkey,fullchain,cert}.pem "${certs_src_dir}/" || error_exit "Halting because of error moving files"
chown root:root "${certs_src_dir}/"{privkey,fullchain,cert}.pem || error_exit "Halting because of error chowning files"
info "Certs moved from /tmp & chowned."
# 3. Copy certificates to target directories if they exist
# ========================================================
for target_dir in "${target_cert_dirs[@]}"; do
if [[ ! -d "$target_dir" ]]; then
debug "Target cert directory '$target_dir' not found, skipping..."
info "Copying certificates to '$target_dir'"
if ! (cp "${certs_src_dir}/"{privkey,fullchain,cert}.pem "$target_dir/" && \
chown root:root "$target_dir/"{privkey,fullchain,cert}.pem); then
warn "Error copying or chowning certs to ${target_dir}"
# 4. Restart services & packages
# ==============================
info "Rebooting all the things..."
for service in "${services_to_restart[@]}"; do
/usr/syno/bin/synosystemctl restart "$service"
for package in "${packages_to_restart[@]}"; do # Restart packages that are installed & turned on
/usr/syno/bin/synopkg is_onoff "$package" 1>/dev/null && /usr/syno/bin/synopkg restart "$package"
# Faster ngnix restart (if certs don't appear to be refreshing, change to synosystemctl
if ! (/usr/syno/bin/synow3tool --gen-all && sudo systemctl reload nginx); then
warn "nginx failed to restart"
info "Completed"
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catchdave commented Oct 5, 2023

Thanks --you are right, it should have parenthesis! I updated the script. Appreciate the suggestion, @xiaozhuai

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raven2cz commented Dec 9, 2023

Hello @catchdave. Nice script! I want to test it. But I have DS218+ where in all certs directories are not just 3 files which is copied by your script.
There are these structure:

cert.pem  chain.pem  fullchain.pem  info  privkey.pem  root.pem  short-chain.pem

I can create cert.pem chain.pem fullchain.pem privkey.pem
But I haven't idea about root.pem short-chain.pem.

Do you have same structure? Or is it something new? How to solve it? Thx for info.

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@raven2cz my advice is to initially manually add your LE cert and make it default. Through the DSM interface, the mapping of LE generated files is:

       	Private Key ---------------> privkey.pem
       	Certificate ---------------> cert.pem
	Intermediate Certificate --> fullchain.pem

Once that's done and the LE cert is now your default certificate, the script should work fine.

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bartowl commented Apr 10, 2024

Great script. You may also be interested in my old scripts for managing certificates also for other apps like MailStation and co. Recently I added also synow3tool call to be able to reload nginx properly in DSM7. This script presents jsut a slightly different approach and was mainly developed for DSM6. If you have a reliable way of reloading services in the absence of /usr/local/libexec/certificate.d/$subscriber in DSM7 I would really appreciate

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