NGINX Reverse Proxy für Exchange 2016

Folgende Pakete müssen auf einem Ubuntu 16.04 LTS installiert werden:

apt install nginx nginx-extras

Die Konfiguration wird abgelegt unter /etc/nginx/conf.d/exchange.conf

Folgende Dinge müssen angepasst werden:

• DNS Name unter dem OWA etc. erreichbar sein soll z.B. mail.example.org
• Autodiscover DNS Name z.B. autodiscover.example.org
• Interner Exchange Server z.B. exchange-server.example.internal

server {
    listen 80;
    server_name mail.example.org autodiscover.example.org;
    return 301 https://$host$request_uri;
}

server {
    tcp_nodelay on;
    listen 443;
    ssl                     on;
    ssl_certificate /etc/ssl/certs/star.example.org.pem;
    ssl_certificate_key /etc/ssl/private/star.example.org.key;

    ssl_session_timeout     5m;
    server_name mail.example.org;

    location / {
            return 301 https://mail.example.org/owa;
    }

    proxy_http_version      1.1;
    proxy_read_timeout      360;
    proxy_pass_header       Date;
    proxy_pass_header       Server;
    proxy_pass_header       Authorization;
    proxy_set_header        Host $host;
    proxy_set_header        X-Real-IP $remote_addr;
    proxy_set_header        X-Forwarded-For  $proxy_add_x_forwarded_for;
    proxy_pass_request_headers on;
    more_set_input_headers 'Authorization: $http_authorization';
    proxy_set_header Accept-Encoding "";
    more_set_headers -s 401 'WWW-Authenticate: Basic realm="exchange-server.example.internal"';
    # proxy_request_buffering off;
    proxy_buffering off;
    proxy_set_header Connection "Keep-Alive";

    location ~* ^/owa { proxy_pass https://exchange-server.example.internal; }
    location ~* ^/Microsoft-Server-ActiveSync { proxy_pass https://exchange-server.example.internal; }
    location ~* ^/ecp { proxy_pass https://exchange-server.example.internal; }
    location ~* ^/rpc { proxy_pass https://exchange-server.example.internal; }
    location ~* ^/autodiscover { proxy_pass https://exchange-server.example.internal; }
    location ~* ^/oab { proxy_pass https://exchange-server.example.internal; }

    error_log /var/log/nginx/exchange-rproxy-ssl-error.log;
    access_log /var/log/nginx/exchange-rproxy-ssl-access.log;
}

Ob alles einwandfrei Funktioniert lässt sich über einen Webservice von Microsoft testen:

https://testconnectivity.microsoft.com/

Quellen:

• http://blog.adamjoshuasmith.com/deploying-exchange-2016-behind-nginx-free/
• https://gist.github.com/taddev/7275873
• https://blog.friedlandreas.net/2016/05/nginx-reverseproxy-fuer-mapi-over-http-eas-und-owa/

Viel Spaß