IMPLEMENTATION GUIDE
JUNIPER NETWORKS SRX
SERIES SERVICES GATEWAYS/
WEBSENSE V10000
SRX Series Configuration to Enable
Security Solutions with TRITON
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information provided herein. Third party product descriptions and related technical details provided in this document are for information purposes only and such
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IMPLEMENTATION GUIDE - Juniper Networks SRX Series Services Gateways/Websense V10000
Introduction
A powerful new paradigm of Internet-enabled relationships is transforming businesses across the globe. Companies
that embrace “Web 2.0” technologies empower effective and lasting connections with employees, customers,
and partners. These are powerful tools that can create and sustain competitive advantage—but the underlying
technologies can also expose the business to complex and dynamic new risks. Juniper Networks® SRX Series Services
Gateways, combined with Websense’s V10000 Web Security Gateways, help companies enjoy the benefits of Web 2.0
solutions while mitigating the associated security challenges with power, speed, and flexibility.
Scope
This document is targeted at system engineers, network administrators, and other technical audiences interested in
designing and implementing Juniper Networks SRX Series Services Gateways with Websense TRITON V10000 Web
Security Gateway appliances.
Design Considerations
Figure 1 illustrates a common network design solution using the SRX Series and V10000 appliances. The SRX Series is
responsible for redirecting specific traffic from the User LAN --for example, HTTP/HTTPS --to the V10000 appliances.
The network administrator configures the TRITON V10000 appliances to provide multi-vector inbound and outbound
real-time content inspection to protect against malware and sensitive data loss. The policy-based user interface
increases user productivity by basing privileges on user or group identity in your corporate user directory. The V10000
proxies user traffic to the Internet. When the user traffic is unauthorized based on protocol or dynamic website policy,
the user’s browser is redirected to the “Block Page” served by the V10000.
The enterprise network includes the SRX Series and the Websense TRITON V10000 appliances in the “management”
segment of the network, and the enterprise users are identified in the “User LAN” segment of the network. This
deployment architecture leverages the flexibility of the SRX Series to securely separate the user traffic from the
network administration of the SRX Series and the Websense security appliances.
For the one V10000 appliance solution, three physical
ports are utilized: “C”, “P1,” and “N.” The “C” port of the
INTERNET
appliance is the management port through which the
administrator manages the appliance. The “C” port is also
the destination for the “Block Page” redirection. The “P1”
port is the proxy port of the V10000 that provides the
Websense
real-time malware and dynamic website classification. The
V10000
SRX Series connects the V10000 to both the user LAN and
SRX
Series
the Internet. The “N” port is used to provide application
and Web protocol-specific blocking and bandwidth
throttling. Over 120 Web protocols are recognized by
protocol “fingerprint” (this permits the identification
of applications such as Skype, BitTorrent, and Yahoo
Chat.) Malware “phone-home” communications are
also recognized and denied access to the Internet. To
implement this capability, a layer 2 switch is needed to
mirror user traffic. When the P1 port allows user traffic,
the V10000 establishes a new traffic flow (proxy) via
the same P1 port. When traffic is not permitted, the
V10000 issues a redirect message via the P1 port to the
V10000
L2 Switch
USER LAN
L2 Switch
Figure 1: Reference network
user browser. The user browser is redirected to a “Block Page” that is served by the V10000 at the C port. These two
scenarios are illustrated in the following ladder diagrams.
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IMPLEMENTATION GUIDE -Juniper Networks SRX Series Services Gateways/Websense V10000
Figure 2 illustrates the ladder diagram for user traffic allowed by the Websense V10000. The V10000 proxies the traffic
between the user and the Internet via the V10000 P1 port. The proxied traffic is indicated by the separate dark gray and
light gray traffic flows.
SRX Series
INTERNET
Websense V10000
P1
User attempts to
access a URL
SRX Series redirects
traꢀc to V10000
V10000 policy allows
traꢀc, establishes new
traꢀc flow (proxy) to
the URL
SRX Series routes
traꢀc to the
URL and performs
NAT if necessary
V10000 proxies
the end-to-end
traꢀc flow to
the target URL
Figure 2: User traffic allowed
Figure 3 illustrates the ladder diagram for user traffic that is blocked and redirected by the V10000.
SRX Series
Websense V10000
P1
C
User attempts to
access a URL
SRX Series redirects
trac to V10000
On a policy violation, the
V10000 blocks trac and
redirects the user's Web browser
User browser
redirected to
V10000 C port
User sees
“blocked page”
on browser
Figure 3: User traffic blocked
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IMPLEMENTATION GUIDE - Juniper Networks SRX Series Services Gateways/Websense V10000
Protocol Operation
The Websense V10000 product uses TCP port 15871. This port service is used to insert an alert placed in-stream with
the Web browser, thereby redirecting the Web browser to a “Block Page” served by the V10000 appliance. The Web
browser is redirected to the V10000 “C” port. The “C” port is typically located in the management segment of the
network, to which the User LAN would typically not have access. Therefore, the SRX Series security policy must be
configured to permit the User LAN traffic to access the V10000 “C” port for TCP/15871.
The SRX Series uses the native Juniper Networks Junos® operating system filter-based forwarding (FBF) approach to
redirect the traffic to the V10000. No special protocol is required to redirect traffic to the V10000.
Implementation
This section provides the step-by-step SRX Series configuration to support the joint solution. Figure 4 illustrates the
reference network that is used throughput this implementation guide. The SRX Series administrator must set up four
(4) separate security zones: “public-inet” (for access to the public Internet), “user-lan” (for access to the internal
network), “management” (for access to the V10000’s “C” port), and “web-redirect” (for access to V10000’s P1 port).
To keep the network diagram simple, each of the SRX Series physical interfaces are shown directly attached to the end
devices. In a field deployment, these ports would most likely be connected via L2 switches.
The four security zones and the permitted traffic flows through the SRX Series are illustrated and explained in Table 1.
INTERNET
public-inet
66.97.23.82
ge-0/0/0
management
172.25.44.19/24
ge-1/0/1
C
Websense
SRX
Series
V10000
P1
ge-2/0/1
web-redirect
192.168.10.12/24
ge-0/0/1
192.168.5.1
192.168.5/24
user-lan
USER LAN
L2 Switch
Figure 4: Example implementation network
Table 1: SRX Series Security Policies
FROM SECURITY ZONE
TO SECURITY ZONE
PURPOSE
user-lan
web-redirect
Redirected traffic to V10000 for security processing
web-redirect
user-lan
public-inet
management
public-inet
public-inet
V10000 proxies allowed user traffic
V10000 redirecting user browser to “Block Page”
User traffic that does not need to be processed by V10000
user-lan
management
V10000 control traffic that needs to access security databases
for subscription updates and other functions
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IMPLEMENTATION GUIDE -Juniper Networks SRX Series Services Gateways/Websense V10000
Implementation Tasks
The SRX Series administrator needs to perform the following configuration steps that are specific to creating an end-
to-end solution with the Websense V10000 appliance.
1. Create the web-redirect security zone that provides access to the V10000 P1 port.
2. Create a FBF that is used to redirect specific traffic from the User LAN to the V10000 P1 port.
3. Add a security policy from user-lan to web-redirect. This step is necessary to allow any traffic to be redirected to the
V10000. A separate access control filter list is used to explicitly specify which traffic is actually redirected.
4. Create an access control filter (called a “firewall filter” in Junos OS) to selectively identify the traffic to be redirected
to the V10000. For the purpose of this implementation guide example, this is HTTP and HTTPS traffic only.
5. Attach the redirecting firewall-filter to the physical interface attached to the User LAN network segment.
6. Add a security policy from user-lan to public-inet. This step is necessary to allow traffic to the Internet that does not
need to be processed by the Websense V10000.
7. Add the V10000 “C” port to the management security zone address book. This step is necessary so that the V10000
can redirect the user Web browser to the “C” port for blocked sites or Web protocols.
8. Create a Websense-specific security application definition for the Websense redirect protocol—TCP/15871.
9. Add a security policy from user-lan to management only to the V10000 “C” port and only for the TCP/15871 traffic.
This step is necessary so that the user Web browser can be redirected to the V10000 “Block Page.” Normally User
LAN traffic should not be allowed to access the management security zone.
10. Add any Network Address Translation (NAT) necessary to support both web-redirect traffic as well as user-lan
traffic out toward the public Internet.
There are two general approaches for configuring Junos OS devices for solution integration with partner products.
The first, and most common, is manually provisioning these steps. This implementation guide presents this detailed
information in a step-by-step fashion. The second approach, which is significantly easier to deploy, is using Junos OS self-
provisioning for Websense. This implementation guide presents an example of such self-provisioning in the next section.
SRX Series Configuration Using Junos Automation
Junos OS natively supports the ability to extend and customize the configuration and operational elements of the
SRX Series using Junos automation capabilities. The key benefit of using Junos automation is that the network
administrator is not required to manually provision the SRX Series with the specific Junos OS commands. Instead, the
administrator needs only to provision the relevant V10000 information, and the SRX Series automatically creates the
required configuration. By using this technique, the administrator can be assured that all required configurations steps
are properly completed, thereby reducing errors and enabling a faster installation.
For example, in the reference network the following is known:
•
•
•
The management security zone is attached to SRX Series interface ge-1/0/1.
The web-redirect security zone is attached to SRX Series interface ge-2/0/1.
The V10000 appliance:
-
-
The C port inet address is 172.25.44.19
The P1 port inet address is 192.168.10.12
•
The User LAN:
-
-
-
-
The SRX Series inet address is 192.168.5.1.
The User LAN network is 192.168.5.0 / 24.
The attached SRX Series interface is ge-0/0/1.
HTTP/HTTPS traffic should be redirected to V10000.
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IMPLEMENTATION GUIDE - Juniper Networks SRX Series Services Gateways/Websense V10000
Junos OS could automatically configure all 10 steps described in the previous section using the following SRX Series
configuration.
[edit]
admin@SRX# show groups
websense {
apply-macro V10000-alpha {
c-port 172.25.44.19;
p1-port 192.168.10.12;
}
apply-macro user-lan {
interface ge-0/0/1;
address 192.168.5.1/24;
redirect V10000-alpha;
}
apply-macro zones {
management ge-1/0/1;
web-redirect ge-2/0/1;
}
}
This configuration shows an example use of Junos OS groups and apply-macros that can be used to organize the
relevant information. This configuration concisely describes the solution details in one location under the “websense”
group. A Junos OS commit script tailored for the Websense solution uses this information to automatically create the
configuration outlined in the 10 steps.
SRX Series Configuration Step by Step
The alternate approach to using Junos automation is to create the configuration manually. This section presents the 10
steps outlined in the previous section.
1. Create the web-redirect security zone that provides access to the V10000 P1 port. This step is accomplished by
defining a new security zone and identifying the interface toward the V10000 P1 port.
[edit]
admin@SRX# show security zones
security-zone web-redirect {
interfaces {
ge-2/0/1.0;
}
}
Note that you should follow this step if the physical interface toward the V10000 P1 interface was already configured. If
this is not the case, then use the following configuration at the interface hierarchy.
admin@SRX# show interfaces ge-2/0/1
description “To Websense V10000 P1 network”;
unit 0 {
family inet {
address 192.168.10.1/24;
}
}
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IMPLEMENTATION GUIDE -Juniper Networks SRX Series Services Gateways/Websense V10000
2. Create a FBF that is used to redirect specific traffic from the User LAN to the V10000 P1 port.
This technique requires a forwarding-based routing-instance that has a single next-hop route to the V10000 P1 port.
The forwarding instance has an independent routing table, which is the basis for changing the routing rules for traffic
processing. In order to populate the forwarder’s routing table correctly, a policy-statement must be defined to only
include routing for the interface going to the V10000 P1 port—in this case ge-2/0/1.
admin@SRX# show policy-options
policy-statement only-web-redirect-interface {
term allow {
from {
instance master;
interface ge-2/0/1.0;
}
then accept;
}
term reject {
then reject;
}
}
The next part is to define the forwarding instance and import only the interface route defined by the only-web-
redirect-interfacerouting policy. The forwarding instance has a single next hop to the V10000 P1 address
192.168.10.12. This is the configuration that redirects all traffic to the V10000 P1 port for processing.
admin@SRK# show routing-instances
to-P1-V10000-alpha {
instance-type forwarding;
routing-options {
static {
route 0.0.0.0/0 next-hop 192.168.10.12;
}
instance-import only-web-redirect-interface;
}
}
3. Add a security policy from user-lan to web-redirect. This step is necessary to allow any traffic to be redirected to the
V10000. A separate access control list is used to explicitly specify which traffic is actually redirected.
admin@SRX# show security policies
from-zone user-lan to-zone web-redirect {
policy permit-all {
match {
source-address any;
destination-address any;
application any;
}
then {
permit;
}
}
}
Note that you should follow this step if the user-lan security zone has already been set up. If it has not been set up,
then do the following to first configure the physical interface and then the security zone. Within the security zone
definition there is an address book definition that identifies the local hosts on the user-lan network. This address book
definition is used in a later step involving a specific security policy.
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IMPLEMENTATION GUIDE - Juniper Networks SRX Series Services Gateways/Websense V10000
admin@SRX# show interfaces ge-0/0/1
description “To User LAN network”;
unit 0 {
family inet {
address 192.168.5.1/24;
}
}
admin@SRX# show security zones
security-zone user-lan {
address-book {
address local-hosts 192.168.5.0/24;
}
interfaces {
ge-0/0/1.0;
}
}
4. Create an access control filter (called a “firewall filter” in Junos OS) to selectively identify the traffic to be redirected
to the V10000. For the purpose of this implementation guide example, this is HTTP and HTTPS traffic only. The
following firewall configuration has two terms. The first term matches on the target redirect traffic (HTTP/HTTPS)
and when found puts the traffic into the forwarding instance created in the prior step. That forwarding instance
determines one thing—it forwards the traffic to the V10000 P1 port. The second term accepts all other (non-
redirected) traffic. This term is very important, and if left out, all other traffic would be silently discarded. The reason
for that is that a firewall filter has an implicit “deny” as a last term rule.
admin@SRX# show firewall
family inet {
filter redirect-to-V10000-alpha {
term web-traffic {
from {
protocol tcp;
port [ http https ];
}
then {
routing-instance to-P1-V10000-alpha;
}
}
term default {
then accept;
}
}
}
5. Attach the redirecting firewall-filter to the physical interface attached to the User LAN network segment. The filter
created in the prior step is added to the physical interface as highlighted.
admin@SRX# show interfaces ge-0/0/1
description “To User LAN network”;
unit 0 {
family inet {
filter {
input redirect-to-V10000-alpha;
}
}
}
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IMPLEMENTATION GUIDE -Juniper Networks SRX Series Services Gateways/Websense V10000
6. Add a security policy from user-lan to public-inet. This step is necessary to allow traffic to the Internet that does not
need to be processed by the Websense V10000.
admin@SRX# show security policies
from-zone user-lan to-zone public-inet {
policy permit-all {
match {
source-address any;
destination-address any;
application any;
}
then {
permit;
}
}
}
Note that you should follow this step if the public-inet security zone has already been configured. If this is not the case,
use the following to set up the interface and security zone.
admin@SRX# show interfaces ge-0/0/0
description “To Public Ineternet”;
unit 0 {
family inet {
address 66.97.23.82/24;
}
}
admin@SRX# show security zones
security-zone public-inet {
screen untrust-screen;
interfaces {
ge-0/0/0.0;
}
}
7. Add the V10000 “C” port address 172.25.44.19 to the management security zone address book. This step is necessary
so that the V10000 can redirect the user Web browser to the “C” port for blocked sites. Note that in addition to the
specific address, an “address-set” has also been defined. This was done should the network need to support multiple
V10000 appliances. Each additional “C” port would be included in the set, and the associated security policy (in an
upcoming step) would not need to be changed.
admin@SRX# show security zones
security-zone management {
address-book {
address V10000-alpha-c 172.25.44.19/32;
address-set V10000-c {
address V10000-alpha-c;
}
}
}
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IMPLEMENTATION GUIDE - Juniper Networks SRX Series Services Gateways/Websense V10000
8. Create a Websense-specific security application definition for the Websense redirect protocol—TCP/15871.
admin@SRX# show applications
application webs-redirect {
protocol tcp;
destination-port 15871;
}
9. Add a security policy from user-lan to management only to the V10000 “C” port and only for the TCP/15871 traffic.
This step is necessary so that the user Web browser can be redirected to the V10000 “Block Page.” Normally User
LAN traffic should not be allowed to access the management security zone.
admin@SRX# show security policies
from-zone lanA to-zone management {
policy redirect-only {
match {
source-address local-hosts;
destination-address V10000-c;
application webs-redirect;
}
then {
permit;
}
}
}
10. Add any NAT necessary to support both web-redirect traffic as well as user-lan traffic out toward the public Internet.
admin@SRX# show security nat source
rule-set websense {
from zone web-redirect;
to zone public-inet;
rule ifnat-all {
match {
source-address 192.168.10.0/24;
destination-address 0.0.0.0/0;
}
then {
source-nat {
interface;
}
}
}
}
rule-set user-lan {
from zone user-lan;
to zone [ public-inet web-redirect ];
rule ifnet-all {
match {
destination-address 0.0.0.0/0;
}
then {
source-nat {
interface;
}
}
}
}
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IMPLEMENTATION GUIDE - Juniper Networks SRX Series Services Gateways/Websense V10000
Summary
Juniper Networks SRX Series Services Gateways provide scalable security solutions with Websense TRITON V10000
appliances. This solution is suitable for a wide range of enterprise and service provider customers.
Appendices
Additional information on the SRX Series Services Gateways:
Additional information on Junos OS filter-based forwarding techniques:
www.juniper.net/techpubs/en_US/junos10.2/topics/usage-guidelines/routing-configuring-filter-based-forwarding.html
Additional information on SRX Series security configuration:
Additional general information on Junos OS:
Additional general information on Junos automation:
Additional information about locating Websense security products:
Additional information regarding installation and deployment of Websense’s V10000:
About Juniper Networks
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infrastructure that creates a responsive and trusted environment for accelerating the deployment of services and
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Copyright 2010 Juniper Networks, Inc. All rights reserved. Juniper Networks, the Juniper Networks logo, Junos,
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