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Solaris security includes the need to protect individual files, as well as entire systems, from unauthorized access, especially using remote-access tools. However, these individual actions need to be placed within a context that logically covers all aspects of security, typically known as levels. A level is an extra barrier that must be breached to obtain access to data. In terms of physical security, a bank provides an excellent analogy. Breaking into a bank s front counter and teller area is as easy as walking through the door, because these doors are publicly accessible. However, providing this level of access sometimes opens doors deeper inside the building. For example, the private banking area, which may normally be accessed only by staff and identified private banking customers, may allow access using a smart card. If a smart card is stolen from a staff member, it could be used to enter the secure area, because the staff member s credentials would be authenticated. Entering this level would not necessarily provide access to the vault: superuser privileges would be required. However, a thorough physical search of the private banking area might yield the key required for entry, or a brute-force attack on the safe s combination might be used to guess the correct combination. Having accessed the vault, if readily negotiated currency or bullion is contained therein, an intruder could easily steal it. However, if the vault contains checks that need to be countersigned,
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the intruder may not be able to make use of the contents. The lesson here is simple: banks provide public services that open up pathways straight to the cash. Banks know that any or all of the physical security layers may be breached. That s why the storage of negotiable securities is always minimized, because any system designed by humans can be broken by humans, with enough time and patience. The only sensible strategy is to make sure that external layers are as difficult to breach as possible and to ensure that security experts are immediately notified of breaches. Similarly, public file areas, such as FTP and Web servers, are publicly accessible areas on computer systems that sometimes provide entry to a different level in the system. An easily guessed or stolen password may provide user-level (but unprivileged) access to the system. A brute-force attack against the local password database might even yield the superuser password. Accessing a local database might contain the target records of interest. However, instead of storing the data plaintext within tables, data may have been written using a stream cipher, making it potentially very difficult to obtain the data. However, because 40-bit ciphers have been broken in the past, obtaining the encrypted data might eventually lead to its dissemination. Again, a key strategy is to ensure that data is secured by as many external layers as possible, and also that the data itself is difficult to negotiate. Increasing the number of levels of security typically leads to a decrease in system ease-of-use. For example, setting a password for accessing a printer requires users to remember and enter a password when challenged. Whether printer access needs this level of security will depend on organizational requirements. For a printer that prints on plain paper, no password may be needed. However, for a printer that prints on bonded paper with an official company letterhead, a password should be used to protect the printer and, optionally, a copy of the file being sent to the printer may need to be stored securely, for auditing purposes. For government and military systems, a number of security specifications and policy documents are available that detail the steps necessary to secure Solaris systems in top secret installations. The U.S. Department of Defense, for example, publishes the Orange Book, formally known as the Department of Defense Trusted Computer System Evaluation Criteria. This publication describes systems that it has evaluated in terms of different protection levels, from weakest to strongest, including the following: Class D Systems that do not pass any tests and are therefore untrusted. No sensitive data should be stored on Class D systems. Class C1 Systems that require authentication based on a user model. Class C2 Systems that provide auditing and logging on a per-user basis, ensuring that file accesses and related operations can always be traced to the initiating user. Class B1 Systems that require security labeling for all files. Labels range from top secret to unclassified. Class B2 Systems that separate normal system administration duties from security activities, which are performed by a separate security officer. This level
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