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Accounts security

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Access Control in Operating Systems

Recommended Books

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UID policy

Linux Security

Authentication

 

Root Account Root Security System Accounts Nobody Account Dormant accounts Security Warning Banner NFS Security  

Groups administration

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SUID and SGID files RPM-based integrity checking Admin Horror Stories Unix History   Humor Etc

The less the number of accounts the less chances that something will going on undetected. That means that it make sense to delete redundant accounts and groups. 

At the same time please be aware that there is a lot of stupid security advice about account security on the Web. Be selective and understand what are you doing. Excessive zeal can lead to making user life more difficult that it should and prompt them for finding workarounds. And usually that are very inventive in this activity...

Also for existing account there should be a set of rules as for permissions and scripts running to verify that those rules are followed. One useful precaution is to remove SUID privileges from the filesystem that holds /home directory.

The same is applicable to /tmp.

See some useful (although outdated) recommendations can be found in Practical UNIX & Internet Security, 2nd Edition Appendix A

Chapter 8: Defending Your Accounts


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Old News ;-)

Unix System Security Checklist

The following is a partial checklist of actions that can be taken to improve security of your Unix system. This list is neither complete, nor can all of the steps be taken on a given system.

It is not sufficient to just go through this list once, as many of these things will change over time. You should periodically "audit" your network, or install tools that will automatically monitor some aspects of system security and notify you of anything that is discovered. Even then, there is still the potential for successful attacks (through modems or any network or terminal connections). You should never consider your systems 99.999% safe unless there is no way to get in besides the keyboard at the console (to be 100% safe, you must also remove the power supply!)

Recommended Links

Unix security - Wikipedia, the free encyclopedia

Chapter 3 Computer System Security and Access Controls

Web Security, Privacy & Commerce, 2nd Edition Chapter 8 The Web's War on Your Privacy

You should also visit the CERT web site. There you will find :

 



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ABUSE: IPs or network segments from which we detect a stream of probes might be blocked for no less then 90 days. Multiple types of probes increase this period.  

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Groupthink : Two Party System as Polyarchy : Corruption of Regulators : Bureaucracies : Understanding Micromanagers and Control Freaks : Toxic Managers :   Harvard Mafia : Diplomatic Communication : Surviving a Bad Performance Review : Insufficient Retirement Funds as Immanent Problem of Neoliberal Regime : PseudoScience : Who Rules America : Neoliberalism  : The Iron Law of Oligarchy : Libertarian Philosophy

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Vol 25, No.12 (December, 2013) Rational Fools vs. Efficient Crooks The efficient markets hypothesis : Political Skeptic Bulletin, 2013 : Unemployment Bulletin, 2010 :  Vol 23, No.10 (October, 2011) An observation about corporate security departments : Slightly Skeptical Euromaydan Chronicles, June 2014 : Greenspan legacy bulletin, 2008 : Vol 25, No.10 (October, 2013) Cryptolocker Trojan (Win32/Crilock.A) : Vol 25, No.08 (August, 2013) Cloud providers as intelligence collection hubs : Financial Humor Bulletin, 2010 : Inequality Bulletin, 2009 : Financial Humor Bulletin, 2008 : Copyleft Problems Bulletin, 2004 : Financial Humor Bulletin, 2011 : Energy Bulletin, 2010 : Malware Protection Bulletin, 2010 : Vol 26, No.1 (January, 2013) Object-Oriented Cult : Political Skeptic Bulletin, 2011 : Vol 23, No.11 (November, 2011) Softpanorama classification of sysadmin horror stories : Vol 25, No.05 (May, 2013) Corporate bullshit as a communication method  : Vol 25, No.06 (June, 2013) A Note on the Relationship of Brooks Law and Conway Law

History:

Fifty glorious years (1950-2000): the triumph of the US computer engineering : Donald Knuth : TAoCP and its Influence of Computer Science : Richard Stallman : Linus Torvalds  : Larry Wall  : John K. Ousterhout : CTSS : Multix OS Unix History : Unix shell history : VI editor : History of pipes concept : Solaris : MS DOSProgramming Languages History : PL/1 : Simula 67 : C : History of GCC developmentScripting Languages : Perl history   : OS History : Mail : DNS : SSH : CPU Instruction Sets : SPARC systems 1987-2006 : Norton Commander : Norton Utilities : Norton Ghost : Frontpage history : Malware Defense History : GNU Screen : OSS early history

Classic books:

The Peter Principle : Parkinson Law : 1984 : The Mythical Man-MonthHow to Solve It by George Polya : The Art of Computer Programming : The Elements of Programming Style : The Unix Haterís Handbook : The Jargon file : The True Believer : Programming Pearls : The Good Soldier Svejk : The Power Elite

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The Last but not Least


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Last modified: October, 20, 2015