Softpanorama

May the source be with you, but remember the KISS principle ;-)
Home Switchboard Unix Administration Red Hat TCP/IP Networks Neoliberalism Toxic Managers
(slightly skeptical) Educational society promoting "Back to basics" movement against IT overcomplexity and  bastardization of classic Unix

Security Warning Banners

File /etc/issue can be used to issue security warnings after login. It can contain, for example, the following text:

This system is a restricted access system. All activity on 
this system is subject to monitoring. If information collected
reveals possible criminal activity or activity that exceeds privileges,
evidence of such activity may be provided to the relevant authorities
for further action. By continuing past this point, you expressly consent
to this monitoring. 

Except on systems using CDE for login, this block of text will be displayed above the login prompt.

FTP Warning Banner

Returning a customized banner to FTP clients when they connect is a good idea, as it helps disguise what system the FTP server is running on. You can send banners to incoming connections either using TCP wrappers as described in the Section called TCP Wrappers and Connection Banners or as described below.

For vsftpd, add the following line to its xinetd configuration file, /etc/xinetd.d/vsftpd:

banner /etc/banners/warning.msg

For wu-ftpd add the exact same line to its configuration file, /etc/ftpaccess.

The contents of the banner file for vsftpd should look something like this:

220-Hello, all activity on ftp.example.com is logged.

Telnet banner

the telnet banner is in /etc/issue, but it does not work for the graphical login... 

SSH banner

The banner display from ssh is controlled in the /etc/ssh/sshd_config file. By default, ssh display the last login message on the tty when you login into the system by ssh.In the sshd_config file,there are three items are controlling the login messages.

They are:

PrintMotd yes/no -- SSH will display the contents in the /etc/motd,if you set this item to YES.

PrintLastLog yes/no -- This item to controlling if display the last login message ,such as login name, login time ...... Default value is true

Banner /path/to/file displaying the contents in the file which you are set by this item.

If you set both PrintMotd to true and Banner to a file /etc/motd you will get banner twice.

You can set the bannet to /etc/issue in Banner and set PrintMotd to no.


Top Visited
Switchboard
Latest
Past week
Past month

NEWS CONTENTS

Old News ;-)

Creating Login Banners

UNIX Login Banners
===========================

The banners for UNIX machines depend on the particular vendor and service. For 
many recent systems (Sun, Linux), creating the file /etc/issue containing the 
banner text causes the banner text to be displayed before the console login 
and before all interactive logins such as telnet, rsh, and rlogin. 

For other systems and for services that do not respond to the /etc/issue file, 
put the banner text in the file /etc/motd. The contents of this file are 
displayed by the global /etc/.login and the /etc/profile files, depending on 
which shell you start (sh or csh), immediately after a successful login. 
Displaying the /etc/motd file immediately after login is also an option for 
the Secure Shell daemon (sshd) and is set in the /usr/local/etc/sshd_config 
file. 

Some versions of the FTP service have been modified to display, after login, 
the contents of the file .login_message found in the root directory of the FTP 
tree or in the users home directory. You will have to try this to see if it 
works. If it does not work, you must put a file named NOTICE_TO_USERS 
containing the warning text into the root directory of the anonymous ftp tree 
and the file or a link to the file into each user's home directory.

For machines that do not use these methods for displaying banners, consult the 
man pages for each service to see if there is a banner mechanism available.

NOTE: An important thing to note here is that if you remove a service from a 
UNIX machine, your machine will be more secure and you will not have to worry 
about placing a banner on that service. If you have open services that you do 
not need simply remove them.
...



Etc

Society

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

Quotes

War and Peace : Skeptical Finance : John Kenneth Galbraith :Talleyrand : Oscar Wilde : Otto Von Bismarck : Keynes : George Carlin : Skeptics : Propaganda  : SE quotes : Language Design and Programming Quotes : Random IT-related quotesSomerset Maugham : Marcus Aurelius : Kurt Vonnegut : Eric Hoffer : Winston Churchill : Napoleon Bonaparte : Ambrose BierceBernard Shaw : Mark Twain Quotes

Bulletin:

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

Most popular humor pages:

Manifest of the Softpanorama IT Slacker Society : Ten Commandments of the IT Slackers Society : Computer Humor Collection : BSD Logo Story : The Cuckoo's Egg : IT Slang : C++ Humor : ARE YOU A BBS ADDICT? : The Perl Purity Test : Object oriented programmers of all nations : Financial Humor : Financial Humor Bulletin, 2008 : Financial Humor Bulletin, 2010 : The Most Comprehensive Collection of Editor-related Humor : Programming Language Humor : Goldman Sachs related humor : Greenspan humor : C Humor : Scripting Humor : Real Programmers Humor : Web Humor : GPL-related Humor : OFM Humor : Politically Incorrect Humor : IDS Humor : "Linux Sucks" Humor : Russian Musical Humor : Best Russian Programmer Humor : Microsoft plans to buy Catholic Church : Richard Stallman Related Humor : Admin Humor : Perl-related Humor : Linus Torvalds Related humor : PseudoScience Related Humor : Networking Humor : Shell Humor : Financial Humor Bulletin, 2011 : Financial Humor Bulletin, 2012 : Financial Humor Bulletin, 2013 : Java Humor : Software Engineering Humor : Sun Solaris Related Humor : Education Humor : IBM Humor : Assembler-related Humor : VIM Humor : Computer Viruses Humor : Bright tomorrow is rescheduled to a day after tomorrow : Classic Computer Humor

The Last but not Least Technology is dominated by two types of people: those who understand what they do not manage and those who manage what they do not understand ~Archibald Putt. Ph.D


Copyright © 1996-2021 by Softpanorama Society. www.softpanorama.org was initially created as a service to the (now defunct) UN Sustainable Development Networking Programme (SDNP) without any remuneration. This document is an industrial compilation designed and created exclusively for educational use and is distributed under the Softpanorama Content License. Original materials copyright belong to respective owners. Quotes are made for educational purposes only in compliance with the fair use doctrine.

FAIR USE NOTICE This site contains copyrighted material the use of which has not always been specifically authorized by the copyright owner. We are making such material available to advance understanding of computer science, IT technology, economic, scientific, and social issues. We believe this constitutes a 'fair use' of any such copyrighted material as provided by section 107 of the US Copyright Law according to which such material can be distributed without profit exclusively for research and educational purposes.

This is a Spartan WHYFF (We Help You For Free) site written by people for whom English is not a native language. Grammar and spelling errors should be expected. The site contain some broken links as it develops like a living tree...

You can use PayPal to to buy a cup of coffee for authors of this site

Disclaimer:

The statements, views and opinions presented on this web page are those of the author (or referenced source) and are not endorsed by, nor do they necessarily reflect, the opinions of the Softpanorama society. We do not warrant the correctness of the information provided or its fitness for any purpose. The site uses AdSense so you need to be aware of Google privacy policy. You you do not want to be tracked by Google please disable Javascript for this site. This site is perfectly usable without Javascript.

Last modified: March 12, 2019