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requires covert channels for data communications and verified testing of an installation s security procedures. Class B3 Systems that requires that a standalone request monitor be available to authenticate all requests for file and resource access. In addition, the request monitor must be secured and all of its operations must be logged. Class A1 Systems that are formally tested and verified installations of a Class B3 system. All of the strategies that are discussed in this chapter are focused on increasing the number of layers through which a potential cracker (or disgruntled staff member) must pass to obtain the data that they are illegally trying to access. Reducing the threat of remote-access exploits and protecting data are key components of this strategy.
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Trusted Solaris implements much stricter controls over UNIX than the standard releases, and it is capable of meeting B1-level security by default. It is designed for organizations that handle military-grade or commercially sensitive data. In addition to the mandatory use of Role-Based Access Control (as reviewed in 11), Trusted Solaris actually has no superuser at all: no single user is permitted to have control over every aspect of system service. This decentralization of authority is necessary in situations where consensus and/or authorization is required to carry out specific activities. For example, a system administrator installing a new Web server might inadvertently interfere with the operations of an existing service. For a server that s handling sensitive production data, the results could be catastrophic. Once a system has been installed in production, it s crucial to define a set of roles that specifies what operations need to be performed by a particular individual. For example, the role of managing a firewall is unrelated to the database administration role, so the two roles should be separated rather than run from a single superuser account. In addition, access to files is restricted by special access control lists, which define file contents as being anything from unclassified up to top secret. Access to data that is labeled as more secret requires a higher level of authentication and authorization than does access to unclassified data. Four roles are defined by default under Trusted Solaris for system management purposes: Security officer Manages all aspects of security on the system, such as auditing, logging, and password management System manager Performs all system management tasks that are not related to security, except for installing new software Root account Oper account Used for installing new software Used for performing backups
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New roles can be created for other tasks, such as database and Web server administration, where necessary. Some aspects of a Trusted Solaris installation already form part of a standard Solaris installation. For example, Trusted Solaris requires that centralized authentication be performed across an encrypted channel using NIS+. This feature is also available on Solaris, although many sites are now moving to LDAP-based authentication.
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When two or more parties communicate with each other, they must have some level of trust. This trust level will determine the extent to which most of the requirements discussed in this section will be required. For example, if your trust domain includes your lawyer s network, then the level of authorization required to access resources inside your network would be lower than the level required if an untrusted entity made a request for access. Similarly, if a principal is authenticated from a trusted domain, then they do not need to be separately authenticated for all subsequent resource requests. The extent to which parties trust each other underlies the different types of security architectures that can be implemented. If a dedicated ISDN line connects two business partners, then they may well trust their communications to be more secure than if connections were being made across the public Internet. Again, it s a question of assessing and managing risks systematically before implementing a specific architecture. Part of the excitement concerning the Trusted Computing Platform developed by Microsoft and others is that the trust equation is reversed between clients and servers, and becomes more symmetric. Currently, clients trust servers to process and store their data correctly so, when you transfer $100 from a savings to a checking account using Internet banking, you trust that the bank will perform the operation. Indeed, the bank has sophisticated messaging and reliable delivery systems to ensure that such transactions are never lost. However, when server data is downloaded to a client, the client is pretty much free to do what they want to it, and the server is essentially powerless to control what the client does with this data. For example, imagine that a user pays to download an MP3 file to her computer from a music retailer. Once that physical file is stored on the client s hard drive, it can be easily e-mailed to others or shared using a file-swapping program. Even if each MP3 file was digitally watermarked on a per-client basis, so that illegally shared files could be traced back to the original purchaser, this is still not going to prevent sharing. So, the notion of making the trust relationship between client and server symmetric simply means that the client trusts the server to honor certain types of data and operations. Thus, even if an MP3 file is downloaded to a client s hard drive, the client operating system must ensure that this cannot be accessed by any application other than an MP3 player. The only question is whether users will permit this kind of trust level, given that malicious server applications could potentially take control of the client s computer. For example, if an illegal MP3 file were detected on the client s system, would the server have the ability, if not the explicit right, to delete it
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