zammad/contrib/apache2/zammad_ssl.conf

#
# this is an example apache 2.4 config for zammad with free letsencrypt.org ssl certificates
# replace all occurrences of example.com with your domain
# create letsencrypt certificate by: certbot certonly --webroot -w /var/www/html -d www.example.com
# create dhparam.pem by: openssl dhparam -out /etc/ssl/dhparam.pem 4096
# download x3 certificate by: wget -q https://letsencrypt.org/certs/lets-encrypt-x3-cross-signed.pem -P /etc/ssl
# you can test your ssl configuration @ https://www.ssllabs.com/ssltest/analyze.html
#

<VirtualHost *:80>
    ServerName example.com

    # security - prevent information disclosure about server version
    ServerTokens Prod

    Redirect permanent / https://example.com
</VirtualHost>

<VirtualHost *:443>
    SSLEngine on
    SSLProtocol all -SSLv2 -SSLv3
    SSLCipherSuite EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH

    SSLCertificateFile /etc/letsencrypt/live/example.com-0000/fullchain.pem
    SSLCertificateKeyFile /etc/letsencrypt/live/example.com-0000/privkey.pem
    SSLCertificateChainFile /etc/ssl/lets-encrypt-x3-cross-signed.pem
    SSLOpenSSLConfCmd DHParameters /etc/ssl/dhparam.pem

    # replace 'localhost' with your fqdn if you want to use zammad from remote
    ServerName localhost

    # security - prevent information disclosure about server version
    ServerTokens Prod

    ## don't loose time with IP address lookups
    HostnameLookups Off

    ## needed for named virtual hosts
    UseCanonicalName Off

    ## configures the footer on server-generated documents
    ServerSignature Off

    ProxyRequests Off
    ProxyPreserveHost On

    <Proxy 127.0.0.1:3000>
      Require local
    </Proxy>

    ProxyPass /assets !
    ProxyPass /favicon.ico !
    ProxyPass /robots.txt !
    ProxyPass /ws ws://127.0.0.1:6042/
    ProxyPass / http://127.0.0.1:3000/

    # Use settings below if proxying does not work and you receive HTTP-Errror 404
    # if you use the settings below, make sure to comment out the above two options
    # This may not apply to all systems, applies to openSuse
    #ProxyPass /ws ws://127.0.0.1:6042/ "retry=1 acque=3000 timeout=600 keepalive=On"
    #ProxyPass / http://127.0.0.1:3000/ "retry=1 acque=3000 timeout=600 keepalive=On"

    DocumentRoot "/opt/zammad/public"

    <Directory />
        Options FollowSymLinks
        AllowOverride None
    </Directory>

    <Directory "/opt/zammad/public">
        Options FollowSymLinks
	      Require all granted
    </Directory>
</VirtualHost>