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Kerberos Server Version 3.12 Administrator's Guide: HP-UX 11i v3 > Chapter 8 Administering the Kerberos Server

Attributes Tab (Principal Information Window)

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Attributes are the characteristics and properties assigned to a principal that control the behavior of the principal. You can use the Attributes tab in the Principal Information window to assign attributes for a principal, as shown in Figure 8-7 “Attributes Tab”.

Figure 8-7 Attributes Tab

Attributes Tab

Table 8-12 “Attributes Tab Components” describes the components of the Attributes tab.

Table 8-12 Attributes Tab Components

ComponentsDescription
PrincipalDisplays the name of the principal you are editing.

LDAP DN

Displays the LDAP DN that you are editing.

Allow Postdated

Specifies whether a principal is allowed for ticket postdating. Postdating is a mechanism that allows a principal to obtain a ticket that is initially invalid, but that can become valid at some time in the future.

The Allow Postdated attribute applies to both user and service principals. If you set the attribute for a user principal, the user can be issued a postdated or postdatable ticket. If you set the attribute for a service principal, the server can issue postdated service tickets for the service.

Allow Renewable Tickets

Specifies if a principal is allowed to renew tickets. Renewable tickets are those that a principal can revalidate up to the maximum renewable time.

The Allow Renewable attribute applies to both user and service principals. If you set the attributes for a user principal, the principal can be issued a renewable ticket. If you set this attribute for a service principal, the server issues a renewable ticket for the service.

You can set the maximum renewable time in the Principal Information>General tab.

Allow Forwardable

Specifies if a principal is allowed ticket forwarding. Forwarding is a process that sends a ticket-granting ticket (TGT) from one network host to another host. The second host system can use the forwarded TGT to generate a new service ticket on behalf of the principal.

The Allow Forwardable attribute applies to both user and service principals. If you set this attribute for a user principal, the principal can be issued a forwarded or forwardable ticket. If you set this attribute for a service principal, the server can issue a forwarded service ticket for the service.

Allow Proxy

Specifies if a principal is allowed proxy tickets. Proxy tickets allow applications that a principal accesses with a TGT to request a special class of service ticket. You can move this type of service ticket to another host on the network that acts on behalf of the principal, for example, a print service printing a file.

The Allow Proxy attribute applies to both user and service principals. If you set this attribute for a user principal, the principal can be issued a proxy ticket. If you set this attribute for a service principal, the server can issue a proxy service ticket for the service.

Allow Duplicate Session Keys

Specifies if a principal is allowed to use a duplicate session key. A duplicate session key is used in user-to-user authentication and specifies which key is used to encrypt the tickets.

Require Preauthentication

Specifies if a principal is required to use preauthentication in the TGT request. Preauthentication means that additional known encrypted data is sent with the ticket request, providing additional security when the TGT is presented to gain access to a secured service.

The Require Preauthentication attribute applies to user and service principals. If this attribute is set for a user principal, the user is required run the logon software that performs authentication using the preauthentication protocol. If this attribute is set for a service principal, the service cannot accept TGTs from a user principal if the user did not obtain a TGT using a preauthentication protocol.

Require Password Change

Specifies that a principal must change its password during the next logon to the Kerberos server. The Require Password Change attribute applies to user principals.

When new principals are added to the database or when the password of the principal is changed, this attribute is controlled by the NoReqChangePwd setting in the password policy file of the principal. By default, NoReqChangePwd is set to 0 (zero), meaning that users must change their passwords during first logon.

Lock Principal

Specifies if a principal is active. A locked principal still exists in the principal database, but it is unable to use or provide Kerberos services.

The Lock Principal attribute applies to both user and service principals. If you set this attribute for a user principal, tickets cannot be issued to the user. If you set this attribute for a service principal, tickets are not issued to it.

When a principal exceeds the maximum number of failed authentication attempts allowed by the password policy file, the Lock attribute is set. The default maximum level allowed for failed authentication attempts is 5. If a principal is locked, an administrative user must unlock the principal before the user authenticates.

Allow As Service

Specifies if a principal is allowed to act as a service. Set this attribute to allow a principal to act as a service (that is, the name of the principal is in the server field of the service ticket). You must select this attribute for any principal that is used as a service principal.

You can apply the Allow As Service attribute to all principals, in addition to principals that act solely as service principals. The attribute is selected by default.

NOTE: User principals must have this attribute set when using user-to-user authentication.

Require Initial Authentication

Specifies if the server is allowed to issue service to the service principal on behalf of a user principal using a previously obtained TGT.

If you set this attribute for the service principal, a user principal must authenticate to the server again, to obtain a ticket for that service. For example, the Change Password service requires that a principal enter a password to receive a ticket for the Change Password service. If you do not set this attribute, the server issues a server ticket based on the TGT that it already possesses.

The Require Initial Authentication attribute applies only to service principals. If you select this attribute for a principal being edited or created, the Allow as Service attribute is automatically selected.

Set As Password Change Service

Specifies if the server is allowed to issue initial tickets to this service principal for user principals whose passwords have expired.

 

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