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By Dave Curry, Visit Amazon's David A. Curry Page, search results, Learn about Author Central, David A. Curry,

As the UNIX process was once initially designed via programmers to be used via different programmers, it used to be utilized in an atmosphere of open cooperation the place safeguard was once of minimum hindrance. Now that its use has unfold to universities, companies, and govt, the exclusive and delicate nature of the information kept on UNIX platforms has made the protection of those platforms of paramount value. regardless of all of the technical papers and workshops on UNIX safeguard, this booklet is exclusive. UNIX method safeguard is the 1st up to date resource to supply the UNIX process person or administrator with the data had to safeguard the knowledge and procedure from unauthorized use. by way of following the approaches defined during this booklet and using the C courses and shell scripts supplied as examples, you could defend your UNIX approach from such a lot attackers. the writer starts off by way of analyzing 4 high-profile breaches of UNIX protection as illustrations of the way a UNIX process should be attacked. He then presents the data essential to guard opposed to those different types of assault, and provides the instruments that may be used to do so.Focusing at the latest liberate of Berkeley and procedure V UNIX, and such seller derivatives as SunOS and ULTRIX, the ebook provides details that may be utilized to any model of UNIX when you consider that 7th variation. concerns mentioned comprise account and password defense, securing the dossier approach, encryption and authentication platforms, TCP/IP community defense, the community details provider (NIS), NFS, RFS, laptop safety, terminals and modems, and UUCP. different chapters describe tips to reply in case your approach is attacked and the way to increase a complete defense coverage in your association. The ebook additionally provides accomplished lists of freely on hand defense software program, and courses and mailing lists facing UNIX safeguard. "UNIX process defense should still turn into well known between website directors suffering to get a deal with on safety wishes - particularly when you consider that so much vendor-specific manuals don’t disguise these famous safety ’holes’ which could reason grief." -Dr. Dobb’s magazine "David A. Curry’s UNIX procedure defense: A consultant for clients and directors is extremely recommended.This should still finish the morbid funny story that UNIX protection books belong to the ’thin-book’ type that comes with The Dan Quayle Spell Checker and The Woody Allen family members Values Guide." -Stan Kelly-Bootle, UNIX evaluation "UNIX method safety: A advisor for clients and directors via David Curry, offers a entire assessment of key matters and provides functional suggestion for making UNIX platforms extra secure." -UniForum per thirty days "UNIX approach protection: A advisor for clients and directors through David A. Curry, offers a rigorous examine safety concerns on BDS four and Systme V unencumber four, enlivened by means of references to 4 recognized defense breakdowns from genuine life." -UNIXWorld "UNIX procedure protection is so in actual fact written that even a few of the extra complicated issues turn into effortless to appreciate, and there are sections that even the main green person will understand. Curry has supplied an important textual content in safeguard for either the start and skilled user." -Sys Admin 0201563274B04062001

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Sticky If set, the “sticky” bit tells the operating system to do special things with the text image of an executable binary file. It is mostly a hold-over from older versions of UNIX, and has little if any use today. However, some newer systems give this bit a special meaning when set on a directory; this is described shortly. SunOS also uses the sticky bit on NFS swap files to inhibit some file system cache operations. The ls Command The ls command, when invoked with the –l option, displays the permission bits associated with a file or directory in a symbolic form.

The president of the company). For more information on security policies, see Chapter 10. Checking Password Security The procedures and policies described in the previous sections, when properly implemented, will greatly reduce the chances of an attacker breaking into your system via a stolen account. However, as with all security measures, the system administrator is responsible for verifying that the policies and procedures are being adhered to. The best way to check the security of the passwords in use on a system is to use a password cracking program much like a real attacker would use.

The groupname is the name assigned to the group, much like a login name. It may be the same as someone’s login name, or different. The maximum length of a group name is eight characters. The password field is unused in Berkeley-derived versions of UNIX (versions without the newgrp command), and should contain an asterisk (*) in this case. The groupid is a number from 0 to 65535 inclusive. Generally numbers below 10 or 100 are reserved for special purposes, but you may choose any unused number. The last field is a commaseparated (no spaces) list of the login names of the users in the group.

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