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Manual Chapter: LTM SSL Forward Proxy and SWG
Manual Chapter
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LTM SSL Forward Proxy and SWG

Overview: Adding SWG to LTM SSL forward proxy

If you have an LTM™ SSL forward proxy configuration, you can add a per-request policy to it. Every time a client makes a URL request, the per-request policy runs. The policy can contain any available per-request policy action item, including those for URL and application categorization and filtering.

Complete these tasks before you start:

  • Configure any URL filters and application filters that you want to use.
  • Configure a per-request policy.
  • Have an LTM SSL forward proxy configuration set up.

Task summary

Creating a DNS resolver

You configure a DNS resolver on the BIG-IP® system to resolve DNS queries and cache the responses. The next time the system receives a query for a response that exists in the cache, the system returns the response from the cache.
  1. On the Main tab, click Network > DNS Resolvers > DNS Resolver List .
    The DNS Resolver List screen opens.
  2. Click Create.
    The New DNS Resolver screen opens.
  3. In the Name field, type a name for the resolver.
  4. Click Finished.

Adding forward zones to a DNS resolver

Before you begin, gather the IP addresses of the nameservers that you want to associate with a forward zone.

Add a forward zone to a DNS resolver when you want the BIG-IP® system to forward queries for particular zones to specific nameservers for resolution in case the resolver does not contain a response to the query.
Note: Creating a forward zone is optional. Without one, a DNS resolver can still make recursive name queries to the root DNS servers; however, this requires that the virtual servers using the cache have a route to the Internet.
  1. On the Main tab, click Network > DNS Resolvers > DNS Resolver List .
    The DNS Resolver List screen opens.
  2. Click the name of the resolver you want to modify.
    The properties screen opens.
  3. On the menu bar, click Forward Zones.
    The Forward Zones screen displays.
  4. Click the Add button.
    Note: You add more than one zone to forward based on the needs of your organization.
  5. In the Name field, type the name of a subdomain or type the fully qualified domain name (FQDN) of a forward zone.
    For example, either example or site.example.com would be valid zone names.
  6. Add one or more nameservers:
    1. In the Address field, type the IP address of a DNS nameserver that is considered authoritative for this zone.
      Based on your network configuration, add IPv4 or IPv6 addresses, or both.
    2. Click Add.
      The address is added to the list.
    Note: The order of nameservers in the configuration does not impact which nameserver the system selects to forward a query to.
  7. Click Finished.

Adding a DNS resolver to the http-explicit profile

An HTTP profile defines the way that you want the BIG-IP®system to manage HTTP traffic.
Note: APM® provides a default http-explicit profile for Secure Web Gateway (SWG) explicit forward proxy. You must add a DNS resolver to the profile.
  1. On the Main tab, click Local Traffic > Profiles > Services > HTTP .
    The HTTP profile list screen opens.
  2. Click the http-explicit link.
    The Properties screen displays.
  3. Scroll down to the Explicit Proxy area.
  4. From the DNS Resolver list, select the DNS resolver you configured previously.
  5. Ensure that you retain the default values for the Tunnel Name and Default Connect Handling fields.
    The default value for Tunnel Name is http-tunnel. The default value for Default Connect Handling is Deny.
  6. Click Finished.

Creating an access profile for LTM-APM

You create an access profile to provide the access policy configuration for a virtual server that establishes a secured session.
  1. On the Main tab, click Access Policy > Access Profiles .
    The Access Profiles List screen opens.
  2. Click Create.
    The New Profile screen opens.
  3. In the Name field, type a name for the access profile.
    Note: An access profile name must be unique among all access profile and any per-request policy names.
  4. From the Profile Type list, select LTM-APM.
    Additional settings display.
  5. In the Language Settings area, add and remove accepted languages, and set the default language.
    A browser uses the highest priority accepted language. If no browser language matches the accepted languages list, the browser uses the default language.
  6. Click Finished.
    This creates an access profile with a default access policy.
The access profile displays in the Access Profiles List. Default-log-setting is assigned to the access profile.
You can configure the access policy further but you are not required to do so.

Verifying log settings for the access profile

Confirm that the correct log settings are selected for the access profile to ensure that events are logged as you intend.
Note: Log settings are configured in the Access Policy Event Logs area of the product. They enable and disable logging for access system and URL request filtering events. Log settings also specify log publishers that send log messages to specified destinations.
  1. On the Main tab, click Access Policy > Access Profiles .
    The Access Profiles List screen opens.
  2. Click the name of the access profile that you want to edit.
    The properties screen opens.
  3. On the menu bar, click Logs.
    The access profile log settings display.
  4. Move log settings between the Available and Selected lists.
    You can assign up to three log settings that enable access system logging to an access profile. You can assign additional log settings to an access profile provided that they enable logging for URl request logging only.
    Note: Logging is disabled when the Selected list is empty.
  5. Click Update.
An access profile is in effect when it is assigned to a virtual server.

Updating the virtual server for SSL forward proxy with SWG

To add per-request processing to an LTM™ SSL forward proxy configuration, associate the access profile, custom HTTP profile, and per-request policy with the virtual server.

  1. On the Main tab, click Local Traffic > Virtual Servers .
    The Virtual Server List screen opens.
  2. Click the name of the virtual server that is configured for LTM SSL forward proxy.
    SSL client and server profiles that are configured specifically for SSL forward proxy are associated with this virtual server.
  3. From the HTTP Profile list, select the HTTP profile you configured earlier.
  4. In the Access Policy area, from the Access Profile list, select the access profile that you configured earlier.
  5. From the Per-Request Policy list, select the per-request policy that you configured earlier.
  6. Click Update.
The access policy is now associated with the virtual server.

Overview: SSL forward proxy client and server authentication

With the BIG-IP® system's SSL forward proxy functionality, you can encrypt all traffic between a client and the BIG-IP system, by using one certificate, and to encrypt all traffic between the BIG-IP system and the server, by using a different certificate.

A client establishes a three-way handshake and SSL connection with the wildcard IP address of the BIG-IP system virtual server. The BIG-IP system then establishes a three-way handshake and SSL connection with the server, and receives and validates a server certificate (while maintaining the separate connection with the client). The BIG-IP system uses the server certificate to create a second unique server certificate to send to the client. The client receives the second server certificate from the BIG-IP system, but recognizes the certificate as originating directly from the server.

Important: To enable SSL forward proxy functionality, you can either:
  • Disassociate existing Client SSL and Server SSL profiles from a virtual server and configure the SSL Forward Proxy settings.
  • Create new Client SSL and Server SSL profiles and configure the SSL Forward Proxy settings.
Then with either option, select the Client SSL and Server SSL profiles on a virtual server. You cannot modify existing Client SSL and Server SSL profiles while they are selected on a virtual server to enable SSL forward proxy functionality.
A virtual server configured with Client and Server SSL profiles for SSL forward proxy     functionality

A virtual server configured with Client and Server SSL profiles for SSL forward proxy functionality

  1. Client establishes three-way handshake and SSL connection with wildcard IP address.
  2. BIG-IP system establishes three-way handshake and SSL connection with server.
  3. BIG-IP system validates a server certificate (Certificate A), while maintaining the separate connection with the client.
  4. BIG-IP system creates different server certificate (Certificate B) and sends it to client.

Task summary

To implement SSL forward proxy client-to-server authentication, as well as application data manipulation, you perform a few basic configuration tasks. Note that you must create both a Client SSL and a Server SSL profile, and enable the SSL Forward Proxy feature in both profiles.

Task list

Creating a custom Client SSL forward proxy profile

You perform this task to create a Client SSL forward proxy profile that makes it possible for client and server authentication while still allowing the BIG-IP® system to perform data optimization, such as decryption and encryption. This profile applies to client-side SSL forward proxy traffic only.

  1. On the Main tab, click Local Traffic > Profiles > SSL > Client .
    The Client profile list screen opens.
  2. Click Create.
    The New Client SSL Profile screen opens.
  3. In the Name field, type a unique name for the profile.
  4. From the Parent Profile list, select clientssl.
  5. From the SSL Forward Proxy list, select Advanced.
  6. Select the Custom check box for the SSL Forward Proxy area.
  7. Modify the SSL Forward Proxy settings.
    1. From the SSL Forward Proxy list, select Enabled.
    2. From the CA Certificate list, select a certificate.
      Important: If the BIG-IP system is part of a DSC Sync-Failover group, always select a non-default certificate name, and ensure that this same certificate name is specified in every instance of this SSL profile in the device group. Taking these actions helps to ensure that SSL handshakes are successful after a failover event.
    3. From the CA Key list, select a key.
      Important: If the BIG-IP system is part of a DSC Sync-Failover group, always select a non-default key name, and ensure that this same key name is specified in every instance of this SSL profile in the device group. Taking these actions helps to ensure that SSL handshakes are successful after a failover event.
    4. In the CA Passphrase field, type a passphrase.
    5. In the Confirm CA Passphrase field, type the passphrase again.
    6. In the Certificate Lifespan field, type a lifespan for the SSL forward proxy certificate in days.
    7. Optional: From the Certificate Extensions list, select Extensions List.
    8. Optional: For the Certificate Extensions List setting, select the extensions that you want in the Available extensions field, and move them to the Enabled Extensions field using the Enable button.
    9. Select the Cache Certificate by Addr-Port check box if you want to cache certificates by IP address and port number.
    10. From the SSL Forward Proxy Bypass list, select Enabled.
      Additional settings display.
    11. From the Bypass Default Action list, select Intercept or Bypass.
      The default action applies to addresses and hostnames that do not match any entry specified in the lists that you specify. The system matches traffic first against destination IP address lists, then source IP address lists, and lastly, hostname lists. Within these, the default action also specifies whether to search the intercept list or the bypass list first.
      Note: If you select Bypass and do not specify any additional settings, you introduce a security risk to your system.
  8. Click Finished.
The custom Client SSL forward proxy profile now appears in the Client SSL profile list screen.

Creating a custom Server SSL forward proxy profile

You perform this task to create a Server SSL forward proxy profile that makes it possible for client and server authentication while still allowing the BIG-IP® system to perform data optimization, such as decryption and encryption. This profile applies to server-side SSL forward proxy traffic only.
  1. On the Main tab, click Local Traffic > Profiles > SSL > Server .
    The SSL Server profile list screen opens.
  2. Click Create.
    The New Server SSL Profile screen opens.
  3. In the Name field, type a unique name for the profile.
  4. From the Parent Profile list select serverssl.
  5. Select the Custom check box for the Configuration area.
  6. From the SSL Forward Proxy list, select Enabled.
  7. Click Finished.
The custom Server SSL forward proxy profile now appears in the Server SSL profile list screen.

Creating a load balancing pool

You can create a load balancing pool (a logical set of devices such as web servers that you group together to receive and process traffic) to efficiently distribute the load on your server resources.
Note: You must create the pool before you create the corresponding virtual server.
  1. On the Main tab, click Local Traffic > Pools .
    The Pool List screen opens.
  2. Click Create.
    The New Pool screen opens.
  3. In the Name field, type a unique name for the pool.
  4. For the Health Monitors setting, in the Available list, select a monitor type, and click << to move the monitor to the Active list.
    Tip: Hold the Shift or Ctrl key to select more than one monitor at a time.
  5. From the Load Balancing Method list, select how the system distributes traffic to members of this pool.
    The default is Round Robin.
  6. For the Priority Group Activation setting, specify how to handle priority groups:
    • Select Disabled to disable priority groups. This is the default option.
    • Select Less than, and in the Available Members field type the minimum number of members that must remain available in each priority group in order for traffic to remain confined to that group.
  7. Using the New Members setting, add each resource that you want to include in the pool:
    1. (Optional) In the Node Name field, type a name for the node portion of the pool member.
    2. In the Address field, type an IP address.
    3. In the Service Port field, type a port number, or select a service name from the list.
    4. (Optional) In the Priority field, type a priority number.
    5. Click Add.
  8. Click Finished.
The load balancing pool appears in the Pools list.

Creating a virtual server for client-side and server-side SSL traffic

You can specify a virtual server to be either a host virtual server or a network virtual server to manage application traffic.
  1. On the Main tab, click Local Traffic > Virtual Servers .
    The Virtual Server List screen opens.
  2. Click the Create button.
    The New Virtual Server screen opens.
  3. In the Name field, type a unique name for the virtual server.
  4. For a network, in the Destination Address field, type an IPv4 or IPv6 address in CIDR format to allow all traffic to be translated.
    The supported format is address/prefix, where the prefix length is in bits. For example, an IPv4 address/prefix is 0.0.0.0/0, and an IPv6 address/prefix is ::/0.
  5. In the Service Port field, type a port number or select a service name from the Service Port list.
  6. For the SSL Profile (Client) setting, from the Available list, select the name of the Client SSL forward proxy profile you previously created, and using the Move button, move the name to the Selected list.
    Important: To enable SSL forward proxy functionality, you can either:
    • Disassociate existing Client SSL and Server SSL profiles from a virtual server and configure the SSL Forward Proxy settings.
    • Create new Client SSL and Server SSL profiles and configure the SSL Forward Proxy settings.
    Then with either option, select the Client SSL and Server SSL profiles on a virtual server. You cannot modify existing Client SSL and Server SSL profiles while they are selected on a virtual server to enable SSL forward proxy functionality.
  7. For the SSL Profile (Server) setting, from the Available list, select the name of the Server SSL forward proxy profile you previously created, and using the Move button, move the name to the Selected list.
    Important: To enable SSL forward proxy functionality, you can either:
    • Disassociate existing Client SSL and Server SSL profiles from a virtual server and configure the SSL Forward Proxy settings.
    • Create new Client SSL and Server SSL profiles and configure the SSL Forward Proxy settings.
    Then with either option, select the Client SSL and Server SSL profiles on a virtual server. You cannot modify existing Client SSL and Server SSL profiles while they are selected on a virtual server to enable SSL forward proxy functionality.
  8. Assign other profiles to the virtual server if applicable.
  9. In the Resources area, from the Default Pool list, select the name of the pool that you created previously.
  10. Click Finished.
The virtual server now appears in the Virtual Server List screen.

Implementation result

After you complete the tasks in this implementation, the BIG-IP® system ensures that the client system and server system can authenticate each other independently. After client and server authentication, the BIG-IP system can intelligently decrypt and manipulate the application data according to the configuration settings in the profiles assigned to the virtual server.

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