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In many organizations the authentication, authorization, and trust models built into the computing and networking infrastructure closely match those represented in organizational structure and processes. Trust between machines is as critical as trust between employees. A new operating system can often throw a kink into day-to-day operation when it does not fit within the existing structure. Transitive trust rules that follow organizational administrative roles usually work well between like operating systems as, for example, trust between UNIX Kerberos realms or trust between Windows NT
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domains. The same capability is not always as seamless when one is trying to map access control and group relationships between dissimilar architectures. Windows 2000 brings additional complexity into these trust mechanisms with its hybrid authentication and authorization framework. Incorporating Windows 2000 into existing NT domain topologies requires careful planning for how domain relationships will be migrated into the new domain tree and forest model. There are also a number of issues which must be resolved regarding two-way synchronization between Windows 2000 and UNIX Kerberos namespaces.
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An additional side effect of the mobility problem just described is that when one uses multiple computers, there tend to be multiple accounts and passwords corresponding to each platform. It can be a real challenge for users and administrators to attempt to keep accounts and passwords synchronized between diverse operating systems. There is also an additional security exposure in that encryption algorithms used on one system may not be supported on the other. The result may mean transmitting clear-text passwords over unsecured networks or maintaining password lists on unsecured workstations.
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Most of the issues described above can be resolved through the use of mutually supported software tools like Sun's Network File System (NFS) or Novell Netware, which provide a means for sharing files, printers and access controls between UNIX and Windows. A robust and cost-effective alternative is Samba, developed by Andrew Tridgell. Samba is a drop-in replacement for the file- and print-sharing services normally provided by Windows NT- or LAN Manager-based systems. Samba augments these services by also encompassing UNIX file systems and printers in the mix of shared resources. Other Samba services include NetBIOS name service for browsing and limited NT Primary Domain Controller emulation. Since its inception in 1991 Samba has grown in popularity; it is now supported by over 100 commercial vendors worldwide. It has been ported to most flavors of UNIX as well as proprietary operating systems like VMS and MVS. In the next two chapters we will review the protocols and system services in UNIX and Windows that are critical to understanding and maintaining Samba. These chapters will benefit those system administrators and programmers who may be unfamiliar with one or the other of these operating systems. The remainder of the text will focus on Samba architecture, installation, configuration, and support tasks.
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2: UNIX Overview
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In the '60s the adage was never to trust anyone over 30. UNIX is quickly approaching the age of 30-something, but contrary to this adage, I believe we can continue to rely on UNIX's consistent, open and portable computing architecture well into its next decade. Over the years UNIX has evolved into a robust cross-platform, multi-tasking, multiprocessing, multi-user operating system complete with a rich application and programming base. In this chapter we will focus on the UNIX tools and services required to support Samba. We will also cover general networking concepts important in internetworking UNIX and Windows resources. Those readers who have already earned their UNIX wizard's merit badge may want to skip this chapter and go right to the next chapter, on Windows.
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Architecturally, UNIX can best be visualized as a tiered set of services and interfaces (Figure 2.1). At the foundation of the structure resides the kernel, which is responsible for managing the interfaces between all hardware components and the execution environment. This includes scheduling work, allocating memory, moving data, and informing tasks when various system events occur. On top of the kernel layer resides the shell. The shell, of which there is more than one, is essentially a command interpreter that accepts input, provides context, and requests services of the kernel on behalf of the user. The penthouse level of the UNIX tier comprises the user interface. Here reside all the commands, scripting languages, graphical interfaces, and utilities that enable the end-user to interoperate with the resources provided by the operating system. An important concept to remember when working with UNIX is that the general interface between all the system objects is that every object is abstracted as a file. This means that all operations are file operations regardless of whether the target is hardware, data, memory, or running tasks.
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