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Printing
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Windows printers can be network-shared with other computers in a workgroup or domain in much the same way that directories are shared. A physical printer is first defined on the server via a simple Add Printer Wizard. The new printer is associated with the appropriate device driver and is then represented in the system by a virtual printer object and queue. Note that multiple physical print devices called a printer pool may be referenced by a single queue name. Once the printer definition is complete, the printer can be assigned a share name and made available for remote access. The remote client uses the same printer definition wizard and selects "network printer" as the target. If the target server installed the network client driver for the particular printer, the driver will be automatically downloaded from the server and installed on the client. After installation is complete, the network printer can be used by applications just as if it were a local device. For the local application or user, there is little discernible difference between a local or remote printer. Documents to be printed on a particular device are routed into the associated queue name and processed by the print server process (Figure 3.11). If the destination is a remote share, the document is transferred to the remote site by the network redirector, otherwise it is routed to the local device.
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Figure 3.11: Printer queue listing
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In the previous section on domains we talked about how domain user and group credentials and rights are stored in the domain controller's Security Account Manager (SAM) database. Rights are rules that govern access to all the resources in the domain. Rights can be defined per individual or to groups of individuals that share similar needs (Figure 3.12). Group rights have both local and global scope. Membership in a global group permits access to resources that reside in multiple domains. Global group rights are governed by the interdomain trust relationships. Local groups are restricted to resources within a single domain. Access may also be limited by local SAM information that exists on nondomain controllers and NT workstations.
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Figure 3.12: User Manager for domains
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The Local Security Authority (LSA) and Net Login service are responsible for verifying access rights to resources and authenticating login requests respectively. The LSA validates each request by checking the user's Resource Identifier (RID) and the domain's Security Identifier (SID) against the access permissions of the requested resource. Resource permissions are defined by Access Control Lists (ACLs).
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Kerberos
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Windows 2000 enhances the SAM/LSA mechanism by integrating Kerberos 5.0 for network authentication. This third-party authentication system described in the previous chapter on UNIX, is a component of Windows 2000 Active Directory. Kerberos provides additional interoperability between Windows and a number of other vendor operating systems and applications that support the MIT Kerberos specification. Note that Kerberos is an authentication system and does not normally indicate authorization information. Microsoft has enhanced Kerberos by incorporating Windows access control information into an unused field within the Kerberos ticket. The field is ignored by MIT Kerberos systems and does not affect overall interoperability. Windows 2000 clients can be configured to use an MIT Kerberos security server for authentication. Under this configuration, authorization information is collected from Windows 2000 servers via Kerberos transitive trust relationships.
Summary
The Windows NT operating system represents a layered architecture with partitioned user and kernel modes similar to those of UNIX. The Windows NT microkernel was based on the Mach microkernel.
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Common Windows networking protocols include TCP/IP, NetBEUI, and IPX. NetBIOS is an API designed to facilitate development of LAN based resource sharing applications. NetBIOS is not a protocol and requires the use of a network transport. NetBIOS-over-TCP/IP, called NetBT, is used by Samba to share UNIX resources with Windows clients. NetBIOS share names are registered and queried in either of two modes: network broadcast or point-to-point communication with a name server. WINS is Microsoft's implementation of a NetBT name server. SMB and the subsequent CIFS are NetBT-based resource sharing and messaging protocols. Samba is an implementation of CIFS version 1.0. There are many dialects of SMB and CIFS that must be negotiated during session startup. Workgroups provide a means of grouping together users and resources that share a common work profile. A Windows domain is a logical collection of users and computers sharing a common security policy and namespace. In each domain, one or more Windows NT computers, called domain controllers, act as a locus for administering and resolving access to all the resources located in the domain. The Primary Domain Controller (PDC) maintains a directory of all the account, group, and password information for the domain. The directory of domain account information is called the Security Accounts Manager (SAM). SAM information may be replicated to one or more Backup Domain Controllers (BDC). Resources may be shared between domains by defining trust relationships. Windows 2000 Active Directory technology groups domains into hierarchical topologies called trees and forests. Resources within a domain are located via browsing services. Each subnet within a domain has an elected local master browser, which maintains a list of available resources within the subnet. The domain PDC acts as a domain master browser to synchronize local master browser resource information. Windows supports a wide range of file systems including FAT, FAT16, FAT32, OS/2
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HPFS, NTFS, and DFS. The Microsoft Distributed File System (DFS) provides a means of organizing directory shares on multiple computers into a single directory tree. Print devices with an associated printer driver are represented as virtual printer objects and referenced by a queue name. Multiple physical print devices, called a printer pool, may be referenced by a single queue name. The Local Security Authority (LSA) and Net Login service are responsible for verifying access rights to resources and authenticating login requests respectively. Resource permissions are definedby Access Control Lists (ACLs). Windows 2000 enhances the SAM/LSA mechanism by integrating Kerberos 5.0 for network authentication.
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