c# wpf qr code generator Figure 6-10 Changing the trust authentication requirements in Visual C#

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Figure 6-10 Changing the trust authentication requirements
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The last option, giving the user group the permission Allowed To Authenticate was chosen. This was the right decision. Only one server was involved and only one group of users required access. By limiting the right to authenticate, we added protection for the server and for the rest of the member computers in the domain. Without permission to authenticate, access can be configured but no access will be allowed.
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Lesson 1
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Designing Forest and Domain Trust Models
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6-19
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Grant Permission to Authenticate After the trust is created, if selective authentication was chosen, the permission to authenticate must be granted to each group of users before they can access any resources. Two types of permission can be granted:
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To set authentication per domain in a forest trust, access the Security properties page of each domain controller in the Domain Controller organizational unit (OU) in Active Directory Users and Computers. To set authentication per server in a Windows Server 2003 external trust, use Active Directory Users and Computers to access the Security properties page of each server on which you want to grant access. On the Security properties page, you will add the Windows Groups that should be allowed to access the servers or the domain controllers and grant the Allowed To Authenticate Permission.
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When selective authentication is in effect and a user requests access across a trust boundary, an Other Organization SID is added to the user s credentials. This triggers a check on the resource server or domain controller to check the user s right to authenticate. A user who is not making a request across the trust boundary has the This Organization SID added to her account after she authenticates. These SIDs the This Organization SID and the Other Organi zation SID are mutually exclusive. Only one of them can be within a user s credentials.
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Issues that Can Prevent Networks from Supporting Trusts
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For a trust relationship to be created and for access across domain and forest boundaries to occur, the network infrastructure must support trusts. Three network issues can prevent this:
Physical infrastructure Domain resources must be physically accessible. Routing and wiring must accommodate access. Name resolution Domain Name System (DNS) must be correctly configured so that the domain name of trust peers can be resolved in both directions. If the domains are not listed in the same DNS server, you must ensure that both DNS servers can be reached by both domains. Firewall configuration Access across firewalls might need to be configured. Access can be tunneled or the following ports must be opened:
The Local Security Authority (LSA) RPC port (also known as the NTDS fixed port, an entry made to fix the port used for RPC) is used for trust creation and to access the LSA policy database. RPC by default dynamically assigns the port for RPC replication. Setting a single, fixed value for this port will reduce the number of ports that are required open on the firewall. To set this port, add a new DWORD value called TCP/IP Port and set the value s data to the port you want to use. The new DWORD value should be added at: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NTDS\Parameters.
6-20
6
Designing a Logical Authentication Strategy
The NETLOGON RPC port is used for NTLM and for a secure channel. It can be identified at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Netlogon \Parameters. Additional ports might be required, such as port 88 or Kerberos authentication and port 135 for endpoint resolution. Port 135 will be used during trust cre ation, and by the object picker to add groups to DACLs.
Possible Access Requirements and Recommended Trust Types
After you know the access requirements of the organization and are comfortable with the trust types, requirements, and restrictions, you are almost ready to design appro priate trust models. First, however, you must map access requirements to trust types. Table 6-3 lists possible access requirements and the recommended trust type and restriction. These best practices are, in many cases, the only way to respond to the spe cific needs listed.
Table 6-3
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