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a cross-forest trust, a Windows Server 2003 CA will not by default chase, or attempt to find, user information necessary to approve a certificate request from a trusted forest. This constraint improves performance and also security because you might not want to issue certificates directly to users in the trusted forest. Cross-forest referral,[link widoczny dla zalogowanych], or referral chasing, can be enabled via a certutil command on certification provider the CA. The certutil setreg policy +EDITF_ENABLELDAPREFERRALS command must be issued at the command prompt on the CA, and then the service must be stopped and started.
An enrollment agent role can be configured by assigning a Windows group permission to obtain an enrollment agent certificate. A user in possession of this type of certificate can obtain a certificate on behalf of other users. For example, if automatic enrollment for smart card certificates is not -wanted or configured, a smart card enrollment agent can produce smart cards for employees. This takes the process out of the hands of the end user, who might have problems understanding the enrollment process,[link widoczny dla zalogowanych], and provides another degree of control over who is issued a smart card, as well as who is issued replacement smart cards. However,[link widoczny dla zalogowanych],[link widoczny dla zalogowanych], this approach provides the enrollment agent with a very powerful right. An enrollment agent might not be necessary if auto-enrollment can be established for certificate needs in which an agent might have been required.
An enrollment agent can be restricted. Enrollment agents by default have sweeping powers and are able to issue certificates for anyone in the organization. Certificates can be restricted by permissions set on the certificate templates; however, CompTIA Certification for stricter control, the ability of the enrollment agent to issue certificates can be constrained by identifying both who can perform the enrollment and who an enrollment agent can enroll. To implement these additional restrictions, version 2 certificates are required.
When a user authenticates across a trust with the Selective authentication option enabled, an Other Organization security ID (SID) is added to the user\'s authorization data. The presence of this SID prompts a check on the resource domain to ensure that the user is allowed to authenticate to the particular service. Once the user is authenticated, if the Other CompTIA Organization SID is not already present, the server to which the user authenticates adds the This Organization SID. Only one of these special SIDs can be present in an authenticated user\'s context.
Administrators in each domain can add objects from one domain to access control lists (ACLs) on shared resources in the other domain. You can use the ACL editor to add or remove objects residing in one domain to ACLs on resources in the other domain. For more information about how to set permissions on resources, refer to Chapter 9, \"Administering Active Directory Objects.\"
Requirements To create a shortcut trust, you must have Enterprise Admin or Domain Admin privileges in both domains within the forest. Each trust is assigned a password that must be known to the administrators of both domains in the relationship.
When to Create a Realm Trust
A realm trust can be established between any non-Windows Kerberos version 5 realm and a Windows Server 2003 domain to allow cross-platform interoperability with security services based on other Kerberos version 5 implementations, such as UNIX or MIT. Realm trusts can be switched from nontransitive to transitive and back and can be either one- or two-way.
Requirements To create a realm trust, you must have Enterprise Admin or Domain Admin privileges for the domain in the Windows Server 2003 forest and the appropriate administrative privileges in the target Kerberos realm.