SSL Insight 编辑

SSL Insight provides visibility into secure web transactions (HTTPS) and allows IT administrators to monitor all the secure web applications being served by the Citrix ADC by providing integrated and real-time and historic monitoring of secure web transactions. With this visibility the administrator can assess following:

• Determine configuration change impact on customer usage: The administrator can understand the impact on clients for making a configuration change like turning off SSLv3 or removing a cipher like RC4-MD5. This can be done by assessing the historic transaction data on this protocol and cipher.

• Quantify client performance: Administrator can understand the impact on Application Response Time based on the SSL ciphers/protocol used or the certificates negotiated.

• Application security: Assess if any of the applications has transactions running on low security protocols, ciphers, or weak key strength.

When SSL Analytics is enabled on a Citrix ADC instance, SSL statistics are recorded and logged for every SSL transaction. The statistics show the details of the SSL flow. Also, every successful connection is logged and displayed by Citrix Application Delivery Management (ADM) Analytics.

SSL Insight provides the following critical information, which is displayed by Citrix ADM Analytics:

• SSL Protocol version negotiated

• Cipher negotiated, and the cipher strength

• Signature Hash algorithm of the certificate used

• Certificate Type & Size

• SSL Front-end and Back-end errors

Note

For successful SSL connections, SSL AppFlow logging happens at the end of every transaction.

Prerequisites

• The Citrix ADC instance on which you intend to configure SSL Insight must be running Citrix ADC software release 11.1 51.21 and higher. Run the following commands on the ADC instance running 11.1 51.21 to enable Logstream as a transport type for SSL Insight.

1. enable ns mode ulfd

2. add ulfd server <IP Address of the ADM>

   For ADC instances running version 12.0 and above, select Logstream as the transport type while enabling AppFlow from ADM.

• The Citrix ADM version and build must be equal to or higher than the Citrix ADC version and build. For example, if you have installed Citrix ADM 11.1 build 61.7, then ensure you have installed Citrix ADC 11.1 build 60.14 or earlier.

Configure SSL Insight

SSL Insight Metrics are included in Web Insight reports if you enable the following elements:

• Enable AppFlow for Web Insight on each Citrix ADC instance.

• Enable ULFD mode on each Citrix ADC instance.

• Enable required AppFlow parameters on each Citrix ADC instance.

Enable the AppFlow feature

Note

You can enable the AppFlow feature either from Citrix ADM or from each Citrix ADC instance.

To enable the AppFlow feature from Citrix ADM:

If your Citrix ADM is 13.0 Build 41.x or later:

1. Navigate to Networks > Instances > Citrix ADC, and select the instance type. For example, VPX.

2. Select the instance and from Select Action list, click Configure Analytics.

3. On the Configure Analytics on Virtual Server(s) page, select the virtual server, and click Enable Analytics.

4. On the Enable Analytics window:

   1. Select Web Insight

   2. Select Logstream as Transport Mode

      Note

      For Citrix ADC 12.0 or earlier, IPFIX is the default option for Transport Mode. For Citrix ADC 12.0 or later, you can either select Logstream or IPFIX as Transport Mode.

      For more information about IPFIX and Logstream, see Logstream overview.

   3. The Expression is true by default

   4. Click OK

      

      Note

      • If you select virtual servers that are not licensed, then Citrix ADM first licenses those virtual servers and then enables analytics

      • For admin partitions, only Web Insight is supported

      • For virtual servers such as Cache Redirection, Authentication, and GSLB, you cannot enable analytics. An error message is displayed.

After you click OK, Citrix ADM processes to enable analytics on the selected virtual servers.

If your Citrix ADM is 13.0 Build 36.27 or earlier:

1. Navigate to Networks > Instances > Citrix ADC, and select the Citrix ADC instance on which you want to enable analytics.

2. From the Select Action list, select Configure Analytics.

   

3. On the Configure Insight page:

   1. Select the Application List for either Load Balancing or Content Switching.

      

   2. Select the virtual server and click Enable AppFlow.

      

4. In the Enable AppFlow dialog box:

   • Enter true in the text box

   • Select Logstream as the transport mode

     Note Citrix recommends you to select Logstream as the transport mode

   • Select Web Insight and click OK.

     

To enable the AppFlow feature by using the Citrix ADC GUI:

In a Citrix ADC instance’s GUI, navigate to Configuration > System > Settings, click Configure Advanced Features, and select AppFlow.

Enable SSL Insight parameters

On each Citrix ADC instance, you have to enable some HTTP parameters to display SSL Insight records in Citrix ADM.

To enable SSL Insight parameters from the Citrix ADC configuration utility:

1. Navigate to Configuration > System > AppFlow, and click Change AppFlowSettings.

2. Select the following check boxes: HTTP Domain, HTTP Host, HTTP Method, HTTP URL, HTTP User-Agent, HTTP Content-Type.  

3. Click OK.

   

View the SSL Insight metrics

SSL Insight metrics in Citrix ADM provide a detailed view of the performance of the SSL transactions served by the Citrix ADC instances. You can view the SSL Insight metrics at the client, server, or application level, and the SSL success and failure transactions’ metrics. With the help of these metrics, you can analyze and optimize your Citrix ADC HTTPS settings and SSL-certificate settings, and track performance issues.

Note

When you create a group, you can assign roles to the group, provide application-level access to the group, and assign users to the group. Citrix ADM analytics now supports virtual IP address based authorization. Your users can now see reports for all Insights for only the applications (virtual servers) that they are authorized to. For more information on groups and assigning users to the group, see Configure Groups.

To monitor SSL Insight Metrics in Citrix ADM:

You can view SSL metrics for:

• An application. Navigate to Applications > Dashboard, click an application, and select Web Insight tab to view the detailed metrics. For more information, see Application Usage Analytics.

• All applications. Navigate to Applications > Web Insight and click Applications and Clients tabs to view the SSL metrics.

Use case: Obtain an overview of the SSL transactions

The following use case describes how you can use SSL Insight to assess the usage of various SSL Parameters and improve security measures.

Consider that you have a set of applications that are using SSL transactions (HTTPS) for communication, and you have configured Citrix ADM to monitor the SSL components. You might need to frequently review the applications so that you can focus first on the applications that need the most attention. The Web Insight dashboard for an application or all applications provides a summary of following SSL parameters under SSL Errors and SSL Usage:

• SSL Certificates

• SSL Protocols

• SSL Cipher

• SSL Key Strength

• SSL Failure – Front end

• SSL Failure – Back end

  

You can click each tab to view details.

Use case: SSL metrics for clients

You can see list of clients (identified by their IP addresses) and the total occurences per client. Navigate to Applications > Web Insight and select the Clients tab to view the details under SSL Usage.

Click a metric to view details and under Clients, click any client IP address to view the SSL metrics for the selected client.