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HTTP Strict Transport Security (HSTS)

Configuring HSTS ensures that all traffic with the server is done using secure HTTPS connections, instead HTTP. HSTS can be configured in the Web.config of CXO-Cockpit via the Configurator by adding the Strict-Transport-Security header to the customHeaders element in the system.webServer section.

<configuration>
        :
  <system.webserver>
        :
    <httpProtocol>
      <customHeaders>
        : 
        <add name="Strict-Transport-Security" value="max-age=31536000; includeSubDomains"/>
        :
      </customHeaders>
    </httpProtocol>
        :
  </system.webserver>
        :
</configuration>

Secure Cookies

When using HTTPS protocol for the CXO-Cockpit website, it is advised to set the following flags on cookies:

  • Secure. Enabling the Secure flag ensures that cookies are not sent over unsecure HTTP connections. This mitigates information leakage.
  • SameSite. Enabling the SameSite flag ensure that cookies are only sent with request done from the same domain. With requests done by other websites, the cookies are not sent. This mitigates information leakage and risks of CSRF.

To add these flags to the cookies used by the CXO-Cockpit application, the Web.config file should be changed. This can be done through the Configurator.

Enable Secure flag

To enable the Secure flag on cookies set the attribute requireSSL on the httpCookies element in the system.web section.

<configuration>       
        :
  <system.web>
        :
    <httpCookies ... requireSSL="true" />
        :
  </system.web>
        : 
</configuration> 

Enable SameSite flag

To enable the SameSite flag on cookies the Web.config needs to be extended with a rewrite rule. To be able to use rewriting within IIS, the URL Rewrite component needs to be installed. More information can be found here: IIS Rewrite module.

After this component is installed, add the following configuration to the system.webServer section.

<configuration>
        :
  <system.webServer>
        :
    <rewrite>
      <outboundRules>
        <rule name="Add SameSite" preCondition="No SameSite">
          <match serverVariable="RESPONSE_Set_Cookie" pattern=".*" negate="false" />
          <action type="Rewrite" value="{R:0}; SameSite=strict" />
        </rule>
        <preConditions>
          <preCondition name="No SameSite">
            <add input="{RESPONSE_Set_Cookie}" pattern="." />
            <add input="{RESPONSE_Set_Cookie}" pattern="; SameSite=strict" negate="true" />
          </preCondition>
        </preConditions>
      </outboundRules>
    </rewrite>
  </system.webServer>
        :
</configuration>
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