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EFS has a handful of other API functions that applications can use to manipulate encrypted files. For example, applications use the AddUsersToEncryptedFile API function to give additional users access to an encrypted file and RemoveUsersFromEncryptedFile to revoke users access to an encrypted file. Applications use the QueryUsersOn-EncryptedFile function to obtain information about a file s associated DDF and DRF key fields. QueryUsersOnEncryptedFile returns the SID, certificate hash value, and display information that each DDF and DRF key field contains. The following output is from the EFSDump utility, from Sysinternals, when an encrypted file is specified as a commandline argument: 1. C:\>efsdump test.txt 2. EFS Information Dumper v1.02 3. Copyright (C) 1999 Mark Russinovich 4. Systems Internals http://www.sysinternals.com 5. test.txt: 6. DDF Entry: 7. DARYL\Mark: 8. CN=Mark,L=EFS,OU=EFS File Encryption Certificate 9. DRF Entry: 10. Unknown user: 11. EFS Data Recovery You can see that the file test.txt has one DDF entry for user Mark and one DRF entry for the EFS Data Recovery agent, which is the only Recovery Agent currently registered on the system.
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11.10 Conclusion
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Windows supports a wide variety of file system formats accessible to both the local system and remote clients. The file system filter driver architecture provides a clean way to extend and augment file system access, and NTFS provides a reliable, secure, scalable file system format for local file system storage. In the next chapter, we ll look at networking on Windows.
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12. Networking
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Windows was designed with networking in mind, and it includes broad networking support that is integrated with the I/O system and the Windows API. The four basic types of networking software are services, APIs, protocols, and network adapter device drivers, and each is layered on the next to form a network stack. Windows has well-defined interfaces for each layer, so in addition to using the wide variety of APIs, protocols, and adapter device drivers that ship with Windows, third parties can extend the operating system s networking capabilities by developing their own. In this chapter, we take you from the top of the Windows networking stack to the bottom. First, we present the mapping between the Windows networking software components and the Open Systems Interconnection (OSI) reference model. Then we briefly describe the networking APIs available on Windows and explain how they are implemented. You ll learn how multiple redirector support and name resolution work and how protocol drivers are implemented. After looking at the implementation of network adapter device drivers, we examine binding, which is the glue that connects services, protocol stacks, and network adapters.
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12.1 Windows Networking Architecture
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The goal of network software is to take a request (usually an I/O request) from an application on one machine, pass it to another machine, execute the request on the remote machine, and return the results to the first machine. In the course of this process, the request must be transformed several times. A high-level request, such as read x number of bytes from file y on machine z, requires software that can determine how to get to machine z and what communication software that machine understands. Then the request must be altered for transmission across a network for example, divided into short packets of information. When the request reaches the other side, it must be checked for completeness, decoded, and sent to the correct operating system component for execution. Finally, the reply must be encoded for sending back across the network.
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12.1.1 The OSI Reference Model
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To help different computer manufacturers standardize and integrate their networking software, in 1984 the International Organization for Standardization (ISO) defined a software model for sending messages between machines. The result was the Open Systems Interconnection (OSI) reference model. The model defines six layers of software and one physical layer of hardware, as shown in Figure 12-1.
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The OSI reference model is an idealized scheme that few systems implement precisely, but it s often used to frame discussions of networking principles. Each layer on one machine assumes that it is talking to the same layer on the other machine. Both machines speak the same language, or protocol, at the same level. In reality, however, a network transmission must pass down each layer on the client machine, be transmitted across the network, and then pass up the layers on the destination machine until it reaches a layer that can understand and implement the request. The purpose of each layer in the OSI model is to provide services to higher layers and to abstract how the services are implemented at lower layers. Detailing the purpose of each layer is beyond the scope of this book, but here are some brief descriptions of the various layers: Application layer Handles information transfer between two network applications, including functions such as security checks, identification of the participating machines, and initiation of the data exchange. Presentation layer Handles data formatting, including issues such as whether lines end in a carriage return/line feed (CR/LF) or just a carriage return (CR), whether data is to be compressed or encrypted, and so forth. Session layer Manages the connection between cooperating applications, including high-level synchronization and monitoring of which application is talking and which is listening. Transport layer On the client, this layer divides messages into packets and assigns them sequence numbers to ensure that they are all received in the proper order. On the destination, it assembles packets that have been received. It also shields the session layer from the effects of changes in hardware. Network layer Creates packet headers and handles routing, congestion control, and internetworking. It is the highest layer that understands the network s topology that is, the physical configuration of the machines in the network, any limitations in bandwidth, and so on. Data-link layer Transmits low-level data frames, waits for acknowledgment that they were received, and retransmits frames that were lost over unreliable lines as a result of collisions. Physical layer Passes bits to the network cable or other physical transmission medium. The gray lines in Figure 12-1 represent protocols used in transmitting a request to a remote machine. As stated earlier, each layer of the hierarchy assumes that it is speaking to the same layer
on another machine and uses a common protocol. The collection of protocols through which a request passes on its way down and back up the layers of the network is called a protocol stack.
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