Cisco 11503 - CSS Content Services Switch User manual

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Cisco Content Services Switch SSL
Configuration Guide
Software Version 7.40
August 2004
Text Part Number: OL-5655-01

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Cisco Content Services Switch SSL Configuration Guide
Copyright © 2004, Cisco Systems, Inc. All rights reserved.
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partnership relationship between Cisco and any other company. (0406R)

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CONTENTS
Preface xv
Audience xvi
How to Use This Guide xvi
Related Documentation xvii
Symbols and Conventions xxi
Obtaining Documentation xxii
Cisco.com xxii
Ordering Documentation xxii
Documentation Feedback xxiii
Obtaining Technical Assistance xxiii
Cisco Technical Support Website xxiii
Submitting a Service Request xxiv
Definitions of Service Request Severity xxiv
Obtaining Additional Publications and Information xxv
CHAPTER 1Overview of CSS SSL 1-1
SSL Cryptography Overview 1-1
SSL Public Key Infrastructure Overview 1-2
Confidentiality 1-3
Authentication 1-4
Message Integrity 1-4
SSL Module Cryptography Capabilities 1-6

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Overview of the SSL Module Functions in the CSS 1-7
SSL Termination 1-8
Client Authentication 1-9
Back-End SSL 1-11
SSL Initiation 1-12
CHAPTER 2SSL Configuration Quick Starts 2-1
RSA Certificate and Key Generation Quick Start 2-2
RSA Certificate and Key Import Quick Start 2-5
SSL Proxy List Quick Start 2-6
SSL Termination Proxy List Quick Start 2-6
Back-End SSL Proxy List Quick Start 2-8
SSL Initiation Proxy List Quick Start 2-10
SSL Service and Content Rule Quick Start 2-13
SSL Termination Service and Content Rule Quick Start 2-13
Back-End SSL Service and Content Rule Quick Start 2-15
SSL Initiation Service Quick Start 2-18
SSL Initiation Content Rule Quick Start 2-20
CHAPTER 3Configuring SSL Certificates and Keys 3-1
Overview of SSL Certificates and Keys 3-1
Generating Certificates and Private Keys in the CSS 3-4
Generating an RSA Key Pair 3-5
Generating a DSA Key Pair 3-6
Generating Diffie-Hellman Key Parameters 3-7
Using an RSA Key to Generate a Certificate Signing Request 3-8
Generating a Self-Signed Certificate 3-10
Preparing a Global Site Certificate 3-11

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Contents
Importing or Exporting Certificates and Private Keys 3-12
Configuring the Default SFTP or FTP Server to Import Certificates and Private
Keys 3-13
Transferring Certificates and Private Keys to the CSS 3-14
Associating Certificate and Private Key Files with Names 3-16
Associating a Certificate with a File 3-17
Associating an RSA Key Pair with a File 3-17
Associating a DSA Key Pair with a File 3-18
Associating Diffie-Hellman Parameters with a File 3-19
Verifying a Certificate Against a Key Pair 3-20
Removing Certificates and Private Keys from the CSS 3-20
CHAPTER 4Configuring SSL Termination 4-1
Overview of SSL Termination 4-1
Creating an SSL Proxy List 4-2
Adding a Description to an SSL Proxy List 4-3
Configuring Virtual SSL Servers for an SSL Proxy List 4-4
Creating an SSL Server Index 4-6
Specifying a Virtual IP Address 4-6
Specifying a Virtual Port 4-7
Assigning Certificate, Key, and Cipher Suites for Server Authentication 4-8
Specifying the RSA Certificate Name 4-8
Specifying the RSA Key Pair Name 4-9
Specifying the DSA Certificate Name 4-9
Specifying the DSA Key Pair Name 4-10
Specifying the Diffie-Hellman Parameter Filename 4-10
Specifying Cipher Suites 4-11
Configuring Client Authentication 4-15
Enabling Client Authentication 4-16
Specifying CA Certificates for Client Certificate Verification 4-16

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Configuring a CRL Record 4-17
Assigning a CRL Record to the Virtual SSL Server 4-19
Handling Client Authentication Failures 4-19
Configuring HTTP Header Insertion 4-20
Inserting Client Certificate Information 4-21
Inserting Server Certificate Information 4-25
Inserting Session Information 4-30
Adding a Prefix to the Fields Inserted in the HTTP Header 4-32
Inserting a Static Text String 4-32
Specifying SSL or TLS Version 4-33
Terminating a Client Connection with a TCP FIN Message Only 4-34
Specifying Secure URL Rewrite 4-34
Specifying SSL Session Cache Timeout 4-37
Specifying SSL Session Handshake Renegotiation 4-38
Configuring the Delay Time for SSL Queued Data 4-40
Specifying SSL TCP Client-Side Connection Timeout Values 4-41
Specifying a TCP SYN Timeout Value (Client-Side Connection) 4-41
Specifying a TCP Inactivity Timeout Value (Client-Side Connection) 4-42
Specifying SSL TCP Server-Side Connection Timeout Values 4-42
Specifying a TCP SYN Timeout Value (Server-Side Connection) 4-43
Specifying a TCP Inactivity Timeout Value (Server-Side Connection) 4-43
Specifying the Nagle Algorithm for SSL TCP Connections 4-44
Specifying the TCP Buffering for SSL TCP Connections 4-45
Activating and Suspending an SSL Proxy List 4-46
Configuring a Service for SSL Termination 4-47
Creating an SSL Service 4-48
Specifying the SSL Acceleration Service Type 4-48
Adding an SSL Proxy List to an SSL Termination Service 4-49
Specifying the SSL Module Slot 4-49
Disabling Keepalive Messages for the SSL Module 4-50

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Contents
Specifying the SSL Session ID Cache Size 4-50
Activating the SSL Service 4-51
Suspending the SSL Service 4-52
Configuring a Content Rule for SSL Termination 4-52
CHAPTER 5Configuring Back-End SSL 5-1
Overview of Back-End SSL 5-1
Creating an SSL Proxy List 5-2
Adding a Description to an SSL Proxy List 5-3
Configuring Back-End SSL Servers in an SSL Proxy List 5-3
Creating a Back-End SSL Server in an SSL Proxy List 5-5
Configuring a Back-End SSL Server Type 5-5
Configuring the VIP Address for an SSL Back-End Server 5-6
Configuring the Virtual Port 5-6
Configuring the Server IP Address 5-7
Configuring the Server Port 5-7
Configuring SSL Version 5-8
Configuring the Available Cipher Suites 5-8
Configuring SSL Session Cache Timeout 5-9
Configuring SSL Session Handshake Renegotiation 5-10
Configuring TCP Virtual Client Connections Timeout Values 5-11
Specifying a TCP SYN Timeout Value for the Virtual Client
Connection 5-11
Specifying a TCP Inactivity Timeout for a Virtual Client Connection 5-12
Configuring TCP Server-Side Connection Timeout Values on the SSL
Module 5-13
Specifying a TCP SYN Timeout Value for a Server-Side Connection 5-13
Specifying a TCP Inactivity Timeout for a Server-Side Connection 5-14
Specifying the Nagle Algorithm for SSL TCP Connections 5-15
Specifying the TCP buffering for SSL TCP Connections 5-16

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Activating and Suspending an SSL Proxy List 5-17
Configuring a Service for Back-End SSL 5-18
Creating an SSL Service 5-19
Configuring the Back-End SSL Service Type 5-19
Adding an SSL Proxy List for a Back-End SSL Server 5-19
Configuring an IP Address for a Back-End SSL Service 5-20
Configuring the Port Number for a Back-End SSL Service 5-20
Activating the SSL Service 5-21
Suspending the SSL Service 5-22
Configuring a Content Rule for Back-End SSL 5-22
CHAPTER 6Configuring SSL Initiation 6-1
Overview of SSL Initiation 6-1
Creating an SSL Initiation Proxy List 6-3
Adding a Description to an SSL Initiation Proxy List 6-4
Configuring Back-End SSL Servers in an SSL Initiation Proxy List 6-4
Creating a Back-End Server in an SSL Initiation Proxy List 6-6
Configuring the Back-End Server as an SSL Initiation Server 6-6
Configuring an IP Address for the SSL Initiation Server 6-7
Configuring a Port for the SSL Initiation Server 6-7
Configuring the SSL Server IP Address 6-8
Configuring the SSL Server Port 6-8
Configuring SSL Version 6-9
Configuring the Available Cipher Suites 6-9
Configuring SSL Session Cache Timeout 6-11
Configuring SSL Session Handshake Renegotiation 6-11

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Contents
Configuring TCP Virtual Client Connections Timeout Values 6-13
Specifying a TCP SYN Timeout Value for the Virtual Client
Connection 6-13
Specifying a TCP Inactivity Timeout for a Virtual Client Connection 6-14
Specifying the Nagle Algorithm for Client-Side Connections 6-15
Configuring TCP Server-Side Connection Timeout Values on the SSL
Module 6-15
Specifying a TCP SYN Timeout Value for a Server-Side Connection 6-16
Specifying a TCP Inactivity Timeout for a Server-Side Connection 6-17
Specifying the Nagle Algorithm for Server-Side Connections 6-17
Specifying the TCP Buffering for SSL TCP Connections 6-18
Configuring Client Certificates and Keys 6-19
Configuring the RSA Certificate Name 6-20
Configuring the RSA Key Name 6-20
Configuring Diffie Hellman Parameters 6-20
Configuring the DSA Certificate Name 6-21
Configuring the DSA Key Filename 6-21
Configuring CA Certificates for Server Authentication 6-21
Activating and Suspending an SSL Proxy List 6-23
Configuring a Service for SSL Initiation 6-24
Creating an SSL Service 6-25
Configuring the SSL Service Type 6-25
Configuring an IP Address for an SSL Initiation Service 6-25
Adding an SSL Proxy List to an SSL Initiation Service 6-26
Specifying the SSL Module Slot 6-26
Configuring the SSL Initiation Service Keepalive Type 6-27
SSL Session ID Cache Size 6-28
Activating the SSL Service 6-28
Suspending the SSL Service 6-29

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Configuring a Content Rule for SSL Initiation 6-29
Troubleshooting SSL Initiation 6-30
CHAPTER 7Displaying SSL Configuration Information and Statistics 7-1
Showing Certificate and Key Pair Information 7-1
Showing SSL Certificates 7-2
Showing SSL RSA Private Keys 7-4
Showing SSL DSA Private Keys 7-5
Showing SSL Diffie-Hellman Parameters 7-6
Showing SSL Associations 7-7
Showing SSL Certificates, Key Pairs, and Diffie-Hellman Parameter Files 7-8
Showing SSL Proxy Configuration Information 7-9
Showing CRL Record Configuration 7-14
Showing SSL URL Rewrite Statistics 7-15
Showing SSL Module Statistics 7-16
Clearing SSL Statistics 7-24
Showing SSL Flows 7-24
CHAPTER 8Examples of CSS SSL Configurations 8-1
Processing of SSL Flows by the SSL Module 8-1
SSL Transparent Proxy Configuration — One SSL Module 8-5
SSL Transparent Proxy Configuration — Two SSL Modules 8-8
SSL Transparent Proxy Configuration — HTTP and Back-End SSL
Servers 8-12
SSL Full Proxy Configuration — One SSL Module 8-17
SSL Initiation Configurations 8-21
SSL Tunnel to Four Data Centers 8-21
SSL Tunnel to One Data Center with Server Authentication 8-25
I NDEX

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FIGURES
Figure 1-1 SSL Handshake Without Client Authentication 1-9
Figure 1-2 SSL Handshake With Client Authentication 1-10
Figure 3-1 SSL Key and Server Certificate Configuration Overview 3-3
Figure 4-1 SSL Termination 4-2
Figure 4-2 Cipher Suite Algorithms 4-11
Figure 5-1 Back-End SSL with SSL Termination 5-2
Figure 6-1 SSL Initiation with an SSL Server 6-2
Figure 6-2 SSL Initiation with a Second CSS Running SSL Termination 6-2
Figure 8-1 CSS Configuration with Multiple SSL Modules 8-2
Figure 8-2 CSS Configuration with a Back-End SSL Server 8-4
Figure 8-3 Transparent Proxy Configuration with a Single SSL Module 8-6
Figure 8-4 Transparent Proxy Configuration with Two SSL Modules 8-9
Figure 8-5 SSL Transparent Proxy Configuration - HTTP and Back-End SSL Servers 8-13
Figure 8-6 Full Proxy Configuration Using a Single SSL Module 8-18
Figure 8-7 SSL Initiation Between a CSS and Four Data Centers 8-22
Figure 8-8 SSL Initiation Between a CSS and One Data Center 8-26

Figures
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TABLES
Table 1-1 SSL Module SSL Cryptography Capabilities 1-6
Table 2-1 RSA Certificate and Key Generation Quick Start 2-2
Table 2-2 RSA Certificate and Key Import Quick Start 2-5
Table 2-3 SSL Termination Proxy List Quick Start 2-7
Table 2-4 Back-End SSL Proxy List Quick Start 2-9
Table 2-5 SSL Initiation Proxy List Quick Start 2-11
Table 2-6 SSL Server Service and Content Rule Quick Start 2-13
Table 2-7 Back-End SSL Service and Content Rule Quick Start 2-15
Table 2-8 SSL Initiation Service Quick Start 2-18
Table 2-9 SSL Initiation Content Rule Quick Start 2-20
Table 4-1 SSL Cipher Suites Supported by the CSS 4-13
Table 4-2 Client Certificate Fields Inserted in the HTTP Header 4-22
Table 4-3 Server Certificate Fields Inserted In the HTTP Header 4-26
Table 4-4 SSL Session Fields Inserted In the HTTP Header 4-31
Table 7-1 Field Descriptions for the show ssl associate cert Command 7-2
Table 7-2 Field Descriptions for the show ssl associate cert certname Command 7-3
Table 7-3 Field Descriptions for the show ssl associate rsakey Command 7-5
Table 7-4 Field Descriptions for the show ssl associate dsakey Command 7-6
Table 7-5 Field Descriptions for the show ssl associate dhparam Command 7-6
Table 7-6 Field Descriptions for the show ssl files Command 7-8
Table 7-7 Field Descriptions for the show ssl-proxy-list Command 7-10
Table 7-8 Field Descriptions for the show ssl-proxy-list Command 7-10
Table 7-9 Field Descriptions for the show ssl crl-record Command 7-14

Tables
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Table 7-10 Field Descriptions for the show ssl urlrewrite Command 7-15
Table 7-11 Field Descriptions for the show ssl statistics Command 7-17
Table 7-12 Field Descriptions for the show ssl flows Command 7-25

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Preface
This guide provides instructions for configuring the SSL features of the Cisco
11500 Series Content Services Switches (CSS). Information in this guide applies
to all CSS models except where noted.
The CSS software is available in a Standard or optional Enhanced feature set.
Proximity Database and Secure Management, which includes Secure Shell Host
and SSL strong encryption for the Device Management User Interface software,
are optional features.
This preface contains the following major sections:
•Audience
•How to Use This Guide
•Related Documentation
•Symbols and Conventions
•Obtaining Documentation
•Documentation Feedback
•Obtaining Technical Assistance
•Obtaining Additional Publications and Information

Preface
Audience
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Audience
This guide is intended for the following trained and qualified service personnel
who are responsible for configuring the CSS:
•Web master
•System administrator
•System operator
How to Use This Guide
This guide is organized as follows:
Chapter Description
Chapter 1,
Overview of CSS SSL
Overview of SSL cryptography and the CSS
SSL features.
Chapter 2, SSL Configuration
Quick Starts
Configure the CSS SSL features quickly
and easily using procedural tables with
command examples followed by
running-config examples for each table.
Chapter 3, Configuring SSL
Certificates and Keys
Import, create, and associate certificates
and key pairs.
Chapter 4, Configuring SSL
Termination
Configure the CSS and the SSL
Acceleration Module to perform Secure
Sockets Layer (SSL) termination between
the client and the Web servers.
Chapter 5, Configuring Back-End
SSL
Configure the CSS and the SSL
Acceleration Module to accept SSL
encrypted data from a client, decrypt the
data to make a load-balancing decision,
then reencrypt the data and send it to a
back-end SSL server.

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Preface
Related Documentation
Related Documentation
In addition to this guide, the Content Services Switch documentation includes the
following publications.
Chapter 6, Configuring SSL
Initiation
Configure the CSS and the SSL
Acceleration Module to accept clear text
from a client and perform SSL encryption
between the CSS and the Web servers.
Chapter 7, Displaying SSL
Configuration Information and
Statistics
Display data and statistics related to your
CSS SSL configuration.
Chapter 8, Examples of CSS SSL
Configurations
Description of SSL flow processing in the
CSS and running-config examples of the
various SSL configurations available on a
CSS.
Chapter Description
Document Title Description
Release Note for the
Cisco 11500 Series
Content Services Switch
This release note provides information on
operating considerations, caveats, and command
line interface (CLI) commands for the Cisco 11500
series CSS.
Cisco 11500 Series
Content Services Switch
Hardware Installation
Guide
This guide provides information for installing,
cabling, and powering the Cisco 11500 series CSS.
In addition, this guide provides information about
CSS specifications, cable pinouts, and hardware
troubleshooting.

Preface
Related Documentation
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Cisco Content Services
Switch Getting Started
Guide
This guide describes how to perform initial
administration and configuration tasks on the CSS,
including:
•Booting the CSS for the first time and a routine
basis, and logging in to the CSS
•Configuring the username and password,
Ethernet management port, static IP routes,
and the date and time
•Configuring DNS server for hostname
resolution
•Configuring sticky cookies with a sticky
overview and advanced load-balancing method
using cookies
•A task list to help you find information in the
CSS documentation
•Troubleshooting the boot process
Cisco Content Services
Switch Administration
Guide
This guide describes how to perform administrative
tasks on the CSS, including upgrading your CSS
software and configuring the following:
•Logging, including displaying log messages
and interpreting sys.log messages
•User profile and CSS parameters
•SNMP
•RMON
•XML documents to configure the CSS
•CSS scripting language
•Offline Diagnostic Monitor (Offline DM)
menu
Document Title Description

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Preface
Related Documentation
Cisco Content Services
Switch Routing and
Bridging Configuration
Guide
This guide describes how to perform routing and
bridging configuration tasks on the CSS, including:
•Management ports, interfaces, and circuits
•Spanning-tree bridging
•Address Resolution Protocol (ARP)
•Routing Information Protocol (RIP)
•Internet Protocol (IP)
•Open Shortest Path First (OSPF) protocol
•Cisco Discovery Protocol (CDP)
•Dynamic Host Configuration Protocol (DHCP)
relay agent
Cisco Content Services
Switch Content
Load-Balancing
Configuration Guide
This guide describes how to perform CSS content
load-balancing configuration tasks, including:
•Flow and port mapping
•Services
•Service, global, and script keepalives
•Source groups
•Loads for services
•Dynamic Feedback Protocol (DFP)
•Owners
•Content rules
•Sticky parameters
•HTTP header load balancing
•Content caching
•Content replication
Document Title Description

Preface
Related Documentation
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Cisco Content Services
Switch Global Server
Load-Balancing
Configuration Guide
This guide describes how to perform CSS global
load-balancing configuration tasks, including:
•Domain Name System (DNS)
•DNS Sticky
•Content Routing Agent
•Client-Side Accelerator
•Network proximity
Cisco Content Services
Switch Redundancy
Configuration Guide
This guide describes how to perform CSS
redundancy configuration tasks, including:
•VIP and virtual interface redundancy
•Adaptive session redundancy
•Box-to-box redundancy
Cisco Content Services
Switch Security
Configuration Guide
This guide describes how to perform CSS security
configuration tasks, including:
•Controlling access to the CSS
•Secure Shell Daemon protocol
•Radius
•TACACS+
•Firewall load balancing
Cisco Content Services
Switch Command
Reference
This reference provides an alphabetical list of all
CLI commands including syntax, options, and
related commands.
Cisco Content Services
Switch Device
Management User’s Guide
This guide describes how to use the Device
Management user interface, an HTML-based
Web-based application that you use to configure
and manage your CSS.
Document Title Description