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Oracle Solaris Administration: Security Services     Oracle Solaris 11 Information Library
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Document Information


Part I Security Overview

1.  Security Services (Overview)

Part II System, File, and Device Security

2.  Managing Machine Security (Overview)

3.  Controlling Access to Systems (Tasks)

4.  Virus Scanning Service (Tasks)

5.  Controlling Access to Devices (Tasks)

6.  Using the Basic Audit Reporting Tool (Tasks)

7.  Controlling Access to Files (Tasks)

Part III Roles, Rights Profiles, and Privileges

8.  Using Roles and Privileges (Overview)

9.  Using Role-Based Access Control (Tasks)

10.  Security Attributes in Oracle Solaris (Reference)

Part IV Cryptographic Services

11.  Cryptographic Framework (Overview)

12.  Cryptographic Framework (Tasks)

13.  Key Management Framework

Part V Authentication Services and Secure Communication

14.  Network Services Authentication (Tasks)

15.  Using PAM

16.  Using SASL

17.  Using Secure Shell (Tasks)

18.  Secure Shell (Reference)

Part VI Kerberos Service

19.  Introduction to the Kerberos Service

20.  Planning for the Kerberos Service

Why Plan for Kerberos Deployments?

Planning Kerberos Realms

Realm Names

Number of Realms

Realm Hierarchy

Mapping Host Names Onto Realms

Client and Service Principal Names

Ports for the KDC and Admin Services

The Number of Slave KDCs

Mapping GSS Credentials to UNIX Credentials

Automatic User Migration to a Kerberos Realm

Which Database Propagation System to Use

Clock Synchronization Within a Realm

Client Configuration Options

Improving Client Login Security

KDC Configuration Options

Trusts of Services for Delegation

Kerberos Encryption Types

Online Help URL in the Graphical Kerberos Administration Tool

21.  Configuring the Kerberos Service (Tasks)

22.  Kerberos Error Messages and Troubleshooting

23.  Administering Kerberos Principals and Policies (Tasks)

24.  Using Kerberos Applications (Tasks)

25.  The Kerberos Service (Reference)

Part VII Auditing in Oracle Solaris

26.  Auditing (Overview)

27.  Planning for Auditing

28.  Managing Auditing (Tasks)

29.  Auditing (Reference)



Planning Kerberos Realms

A realm is logical network, similar to a domain, that defines a group of systems that are under the same master KDC. As with establishing a DNS domain name, issues such as the realm name, the number and size of each realm, and the relationship of a realm to other realms for cross-realm authentication should be resolved before you configure the Kerberos service.

Realm Names

Realm names can consist of any ASCII string. Usually, the realm name is the same as your DNS domain name, except that the realm name is in uppercase. This convention helps differentiate problems with the Kerberos service from problems with the DNS namespace, while using a name that is familiar. If you do not use DNS or you choose to use a different string, then you can use any string. However, the configuration process requires more work. The use of realm names that follow the standard Internet naming structure is wise.

Number of Realms

The number of realms that your installation requires depends on several factors:

Alignment of Kerberos realms with administrative domains is recommended. Note that a Kerberos V realm can span multiple sub-domains of the DNS domain to which the realm corresponds.

Realm Hierarchy

When you are configuring multiple realms for cross-realm authentication, you need to decide how to tie the realms together. You can establish a hierarchical relationship among the realms, which provides automatic paths to the related domains. Of course, all realms in the hierarchical chain must be configured properly. The automatic paths can ease the administration burden. However, if there are many levels of domains, you might not want to use the default path because it requires too many transactions.

You can also choose to establish the trust relationship directly. A direct trust relationship is most useful when too many levels exist between two hierarchical realms or when no hierarchal relationship exists. The connection must be defined in the /etc/krb5/krb5.conf file on all hosts that use the connection. So, some additional work is required. The direct trust relationship is also referred to as a transitive relationship. For an introduction, see Kerberos Realms. For the configuration procedures for multiple realms, see Configuring Cross-Realm Authentication.