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Network security

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

Why use encrypted connections? See: Article from Cloudflare.

Options you have:

VPN​

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

TLS​

Semaphore supports SSL/TLS starting from v2.12.

config.json:

{
    ...
    "tls": {
        "enabled": true,
        "cert_file": "/path/to/cert/example.com.cert",
        "key_file": "/path/to/key/example.com.key"
    }
    ...
}

Or environment variables (useful for Docker):

export SEMAPHORE_TLS_ENABLED=True
export SEMAPHORE_TLS_CERT_FILE=/path/to/cert/example.com.cert
export SEMAPHORE_TLS_KEY_FILE=/path/to/key/example.com.key

HTTP-to-HTTPS redirect listener​

To configure the HTTP-to-HTTPS redirect listener, add one of the following fields to the tls block in config.json, or set the corresponding environment variable.

Use http_redirect_addr to bind the listener to a specific IP address and port. Use http_redirect_port to listen on all network interfaces. These options are mutually exclusive.

Bind HTTP redirect listener toconfig.json (tls block)Environment variable
Specific IP address and port"http_redirect_addr": "172.29.184.90:80"SEMAPHORE_TLS_HTTP_REDIRECT_ADDR=172.29.184.90:80
All network interfaces on a port"http_redirect_port": 80SEMAPHORE_TLS_HTTP_REDIRECT_PORT=80

Reverse proxy​

Alternatively, you can use a reverse proxy in front of Semaphore to handle secure connections. For example:

Self-signed SSL certificate​

You can generate your own SSL certificate with using openssl CLI tool:

openssl req -x509 -newkey rsa:4096 \
    -keyout key.pem -out cert.pem \
    -sha256 -days 3650 -nodes \
    -subj "/C=US/ST=California/L=San Francisco/O=CompanyName/OU=DevOps/CN=example.com"

Let's Encrypt SSL certificate​

You can use Certbot to generate and automatically renew a Let's Encrypt SSL certificate.

Example for Apache:

sudo snap install certbot
sudo certbot --apache -n --agree-tos -d example.com -m [email protected]

Others​

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