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Web server

The web server of Linkurious Enterprise delivers the application to end users through HTTP/S. It is configured in the server configuration key within the configuration file (linkurious/data/config/production.json):

General

Within the server key:

  • listenPort (default: 3000): The port of the web server

Some firewalls block network traffic ports other than 80 (HTTP). Since only root users can listen on ports lower than 1024, you may want reroute traffic from 80 to 3000 as follows:

sudo iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 3000

If you use SSL, you can add a second rule to redirect 3443 to 443:

sudo iptables -t nat -A PREROUTING -p tcp --dport 443 -j REDIRECT --to-port 3443

Serving Linkurious Enterprise under a custom path

Within the server key:

  • baseFolder (default: /): The base path where Linkurious Enterprise will be found

In some cases, you may want to host Linkurious Enterprise on a path other than root for a particular domain. For example, if you want Linkurious Enterprise to be reachable at http(s)://HOST:PORT/linkurious you should set baseFolder equal to linkurious.

Link generation

Within the server key:

  • domain (default: "localhost"): The domain or sub-domain used to access the web server. It is mandatory to edit it for publishing visualizations online. It is also used to restrict the validity of cookies to a domain or sub-domain.
  • publicPortHttp (default: listenPort): The public HTTP port of the web server.
  • publicPortHttps (default: listenPortHttps): The public HTTPS port of the web server.

In some cases, Linkurious Enterprise needs to generate links to itself (for example when generating a link to a widget). For that, the server needs to know its public domain and port to generate those links.

The public port can be different from the actual port if you use traffic rerouting (using a firewall or a reverse-proxy). In the example above (traffic rerouting), the actual HTTP port (listenPort) is 3000, but the public HTTP port (publicPortHttp) is 80.

Cookies

Within the server key:

  • cookieSecret (optional): Set the secret used to compute the hash of you session.
  • cookieDomain (optional): Set this value if you need your cookie to be set for a domain different from domain.
  • cookieHttpOnly (default: true): Set the httpOnly flag of your cookies.
  • cookieSecure (default: false): Set the secure flag of your cookies.

Cross-origin resource sharing (CORS)

Within the server key:

  • allowOrigin: Define the cross-origin resource sharing (CORS) policy. Accept cross-site HTTP/S requests by default. The value can be:
    • a string ("abc.com"): only requests from "abc.com" domain are allowed.
    • wildcard-prefixed string ("*.abc.com"): request from all sub-domains of abc.com are allowed.
    • an array of strings (["abc.com", "*.def.com"]): requests from abc.com and all sub-domains of def.com are allowed.
    • a single wildcard ("*"): requests from any domain are allowed.

Allow to render Linkurious embedded in another web page

Within the server key:

  • allowFraming (default: false): Whether a browser should render Linkurious inside a frame.

By default, Linkurious doesn't allow framing by returning at each request the following HTTP header: X-Frame-Options:SAMEORIGIN.

Setting the configuration key to true will remove the X-Frame-Options HTTP header.

Custom HTTP Headers

Within the server key:

  • customHTTPHeaders (optional): For compliance, custom HTTP headers can be added to configuration to be returned in the headers with each response from the server.

Example:

customHTTPHeaders:{
  'header1': 'value1',
  'header2': 'value2',
  ...
}

Note: Some header keys are reserved for LKE and will be overwritten by the server to default values.

Image cross-origin (client-side)

Within the ogma.settings.render key:

  • imgCrossOrigin (default: "anonymous"): Restrict the origin of images displayed in visualizations to prevent running malicious code on the graphic card of users. Display images from any origin by default. Read here to learn more.

SSL

Within the server key:

  • listenPortHttps (default: 3443): The port of the web server if HTTPS is enabled. See the Install section to learn why you should not set 443 directly.
  • useHttps (default: false): Encrypt communications through HTTPS if true. Requires a valid SSL certificate.
  • forceHttps (default: false): Force all traffic to use HTTPS only if true.
  • forcePublicHttps (default: false): Force all generated URL in Linkurious Enterprise to use HTTPS (useful when HTTPS is not enabled in Linkurious Enterprise but offered by an external reverse proxy). The server will redirect HTTP GET requests to HTTPS and reject all other HTTP requests.
  • certificateFile: The relative path to the SSL certificate (must be in PEM format, located within the linkurious/data folder).
  • certificateKeyFile: The relative path to a private key of the SSL certificate (must be in PEM format, located within the linkurious/data folder).
  • certificatePassphrase: The pass-phrase protecting the SSL certificate (if any).
  • tlsCipherList (optional): The ciphers supported by any connection established by Linkurious Enterprise as a server or client. It expects a string in OpenSSL cipher list format. The default value is tls.DEFAULT_CIPHERS.

External communications with the Linkurious Enterprise server can be secured using SSL without installing third-party software.

If the Linkurious Enterprise server, graph database, and the search index are installed on different machines, we recommend using secure communication channels between these machines (e.g. HTTPS or WSS). Please refer to the data-source documentation and search index documentation to learn how to enable HTTPS.

To use custom Certificate Authorities (CA), please check how to use additional Certificate Authorities in Linkurious Enterprise.

The TLS protocols supported by Linkurious Enterprise server are TLSv1.0, TLSv1.1 and TLSv1.2. If for compliance reasons you want to manually disable TLSv1.0 and TLSv1.1, you can open the file data/manager/manager.json and add "--tls-min-v1.2", above "server/app.js",, save the file and restart Linkurious Enterprise.