Database encryption

Sensitive data is stored in the database, in an encrypted form. You should set the configuration option access_key_encryption in configuration file to enable Access Keys encryption. It must be generated by command:

head -c32 /dev/urandom | base64

Encrypted connection

For security reasons, Semaphore should not be used over unencrypted HTTP!

Why use encrypted connections? See: Article

Options you have:

  • VPN

  • Reverse Proxy with SSL


You can use a Client-to-Site VPN, that terminates on the Semaphore server, to encrypt & secure the connection.

Reverse Proxy with SSL

Semaphore doesn't support SSL/TLS on its own.

You need to use a reverse proxy like NGINX / Apache / HAProxy in front of Semaphore to serve secure connections.


Configuration example:

server {
  listen 443 ssl;
  server_name  _;

  # add Strict-Transport-Security to prevent man in the middle attacks
  add_header Strict-Transport-Security "max-age=31536000" always;

  # SSL
  ssl_certificate /etc/nginx/cert/cert.pem;
  ssl_certificate_key /etc/nginx/cert/privkey.pem;

  # Recommendations from 
  ssl_protocols TLSv1.1 TLSv1.2;
  ssl_prefer_server_ciphers on;
  ssl_session_cache shared:SSL:10m;

  # required to avoid HTTP 411: see Issue #1486 
  # (
  chunked_transfer_encoding on;

  location / {
    proxy_set_header Host $http_host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;

    proxy_buffering off;
    proxy_request_buffering off;

  location /api/ws {
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_set_header Origin "";


<VirtualHost *:443>

    ServerName yourapp.test

    ServerAdmin webmaster@localhost
    SSLEngine on
    SSLCertificateFile /path/to/www_yoursite_com.crt
    SSLCertificateKeyFile /path/to/www_yoursite_com.key

    <Location />

    <Location /api/ws>
        ProxyPass ws://


If you want to use any other reverse proxy - make sure to also forward websocket connections on the /api/ws route!

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