DOCSLIB.ORG

Linux: Configuring and Securing Your Server Howto Guide

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Linux: Configuring and Securing Your Server Howto Guide Linux: Configuring and securing your server howto guide A technical howto document presented to H3ABioNet Created by The System Administrator Task-force Prepared for The greater H3ABioNet and H3Africa Consortium community Document Control Date Author Authorization By Version Description 27 June 2014 Suresh System Administrator 1.0 First draft Maslamoney Task-force Contributors Last Name First Name Institution Country Alibi Mohamed Pasteur Institute of Tunis (IPT) Tunisia Brown David Rhodes University (RU) South Africa Indome David Noguchi Memorial Institute for Medical Research Ghana (NMIMR) Scheepers Inus Centre for High Performance Computing (CHPC) South Africa Maslamoney Suresh Computational Biology Group – UCT (CBIO) South Africa Panji Sumir Computational Biology Group – UCT (CBIO) South Africa Van Heusden Peter South African National Bioinformatics (SANBI) South Africa Marcello Lucio (CIDRES) Burkina Faso Reviewers Last Name First Name Institution Country HowTo: Linux Server Management and Configuration Guide Page 2 of 33 Acronyms and Abbreviations Acronym and Abbreviations Description CLI The Command Line Interface refers to the actual local terminal on the Linux server used to navigate, configure and manage the system NIC A Network Interface Card is a physical network card installed the physical server OS A Operating System is a piece of software which is installed on a computer system and manages communication between the physical hardware and user based applications SL Scientific Linux Operating System HowTo: Linux Server Management and Configuration Guide Page 3 of 33 Table of Contents Document Control................................................................................................................................... 2 Contributors ............................................................................................................................................ 2 Reviewers ................................................................................................................................................ 2 Acronyms and Abbreviations .................................................................................................................. 3 Introduction ............................................................................................................................................ 6 Support Contact Information .................................................................................................................. 6 Overview ................................................................................................................................................. 7 1. Network Interface Card (NIC) Configuration .................................................................................. 7 2. Software repositories ...................................................................................................................... 9 2.1. Package manager ................................................................................................................. 11 3. User Accounts ............................................................................................................................... 12 3.1. Creating general user accounts ....................................................................................... 12 3.2. Granting user accounts sudo rights ................................................................................ 13 4. Services ......................................................................................................................................... 13 5. Securing your local server: The basics .......................................................................................... 14 5.1. Install and configure a Linux firewall ................................................................................... 15 5.1.1. To install ufw from the CLI .............................................................................................. 15 5.1.2. iptables ............................................................................................................................ 15 5.2. Secure shell (SSH) ................................................................................................................ 16 5.2.1. How Does SSH Work? ...................................................................................................... 16 5.2.2. How to configure SSH ...................................................................................................... 17 5.2.3. How to log into SSH with keys ......................................................................................... 18 5.2.4. How to create SSH keys ................................................................................................... 18 5.2.5. How To Transfer Your Public Key to the Server .............................................................. 19 5.3. Server hardening (SELinux and AppArmor) ......................................................................... 20 AppArmor ...................................................................................................................................... 20 SELinux .......................................................................................................................................... 20 5.4. Nmap - Scanning the local machine or network ................................................................. 21 5.4.1. Installing nmap ................................................................................................................ 21 5.4.2. Basic nmap usage commands ............................................................................................. 22 5.5. Log Files ............................................................................................................................... 22 5.5.1. LogWatch ........................................................................................................................ 23 5.5.2. Deny Hosts ...................................................................................................................... 24 HowTo: Linux Server Management and Configuration Guide Page 4 of 33 5.5.3. Fail2ban ........................................................................................................................... 25 5.6. Audit your system security .................................................................................................. 26 6. Data Encryption............................................................................................................................. 27 6.1. GnuPG .................................................................................................................................. 28 6.2. Crypt .................................................................................................................................... 30 6.3. 7-Zip ..................................................................................................................................... 31 7. Software application and OS updates ........................................................................................... 32 8. References .................................................................................................................................... 33 HowTo: Linux Server Management and Configuration Guide Page 5 of 33 Introduction This document was developed by the H3ABioNet system administrator task force and is focused specifically on H3ABioNet system administrators who do not have Linux specific skills. In the level one documentation we looked at how to configure RAID on your hard drives and how to install the three officially supported Linux distributions. In this document we concentrate on configuring and securing your local server Support Contact Information Table 1 below lists all the support contact details for the C6145 server. Both groups of support personnel will provide both hardware and software support to H3ABioNet consortium members. The H3ABioNet helpdesk will however provide additional bioinformatics support. Table 1 Vendor Contact Number Contact Description Person H3ABioNet [email protected] Helpdesk Log all calls via the H3AbioNet Helpdesk helpdesk and a support specialist will be assigned to your call HowTo: Linux Server Management and Configuration Guide Page 6 of 33 Overview This howto document sets out to provide tips, best practices and step by step instructions for configuring and securing your server. The level 2 series of howto guides starts with this document and branches out to additional howto guides such as installing and using a HPC cluster and Globus Online application for transferring data between nodes. This document begins with the configuration of your network cards. Once your operating system is installed, your next step is to configure the network cards. This step is important as it makes your server accessible via the network. 1. Network Interface Card (NIC) Configuration For a computer system to work on a network it requires an IP address. The server can be configured to us a static IP address or one assigned by a DHCP server. The below instruction will provide step by step instruction to configure your network interface cards to use either a statically assigned IP address or one automatically assigned by a DHCP server. Setting up of a DHCP server is beyond the scope of this howto and as such will not be discussed. NOTE: 1. Network
Load more

Recommended publications
  • MASTERCLASS GNUPG MASTERCLASS You Wouldn’T Want Other People Opening Your Letters and BEN EVERARD Your Data Is No Different
    MASTERCLASS GNUPG MASTERCLASS You wouldn’t want other people opening your letters and BEN EVERARD your data is no different. Encrypt it today! SECURE EMAIL WITH GNUPG AND ENIGMAIL Send encrypted emails from your favourite email client. our typical email is about as secure as a The first thing that you need to do is create a key to JOHN LANE postcard, which is good news if you’re a represent your identity in the OpenPGP world. You’d Ygovernment agency. But you wouldn’t use a typically create one key per identity that you have. postcard for most things sent in the post; you’d use a Most people would have one identity, being sealed envelope. Email is no different; you just need themselves as a person. However, some may find an envelope – and it’s called “Encryption”. having separate personal and professional identities Since the early 1990s, the main way to encrypt useful. It’s a personal choice, but starting with a single email has been PGP, which stands for “Pretty Good key will help while you’re learning. Privacy”. It’s a protocol for the secure encryption of Launch Seahorse and click on the large plus-sign email that has since evolved into an open standard icon that’s just below the menu. Select ‘PGP Key’ and called OpenPGP. work your way through the screens that follow to supply your name and email address and then My lovely horse generate the key. The GNU Privacy Guard (GnuPG), is a free, GPL-licensed You can, optionally, use the Advanced Key Options implementation of the OpenPGP standard (there are to add a comment that can help others identify your other implementations, both free and commercial – key and to select the cipher, its strength and set when the PGP name now refers to a commercial product the key should expire.
    [Show full text]
  • FAKULT¨AT F¨UR INFORMATIK Cryogenic Enabling Power-Aware
    FAKULTAT¨ FUR¨ INFORMATIK DER TECHNISCHEN UNIVERSITAT¨ MUNCHEN¨ Masterarbeit in Informatik Cryogenic Enabling Power-Aware Applications on Linux Alejandra Morales Ruiz FAKULTAT¨ FUR¨ INFORMATIK DER TECHNISCHEN UNIVERSITAT¨ MUNCHEN¨ Masterarbeit in Informatik Cryogenic Enabling Power-Aware Applications on Linux Cryogenic Ein Linux Kernel-Modul fur¨ Kooperatives Energiesparen Author: Alejandra Morales Ruiz Supervisor: Dr. Christian Grothoff Date: February 17, 2014 Ich versichere, dass ich dieses Master-Thesis selbstandig¨ verfasst und nur die angegebe- nen Quellen und Hilfsmittel verwendet habe. I assure the single handed composition of this master’s thesis only supported by declared resources. Munich, February 17, 2014 Alejandra Morales Ruiz Acknowledgments I want to thank Christian Grothoff for giving me the opportunity to write this thesis as well as for the support and advice given throughout its completion. I also thank the people at the Chair for Robotics and Embedded Systems, especially Reinhard Lafrenz and Steffen Wittmeier, who allowed me to access their laboratory and provided me with the necessary equipment to perform the energy measurements. Thanks to Danny Hughes and Wilfried Daniels, from the Katholieke Universiteit Leuven, for their advice and contributions to the experimentation and the subsequent results of this work. I would also like to express my gratitude to the whole community of Linux developers for sharing their knowledge and experience on the Internet, which has helped me not only during this thesis, but during all my studies. Finally, I would like to thank my parents and brothers, who always supported and en- couraged me to finish my studies abroad, and my partner, Angel,´ because this thesis would have never been possible without him.
    [Show full text]
  • The Science DMZ
    The Science DMZ Brian Tierney, Eli Dart, Eric Pouyoul, Jason Zurawski ESnet Supporting Data-Intensive Research Workshop QuestNet 2013 Gold Coast, Australia July 2, 2013 What’s there to worry about? © Owen Humphreys/National Geographic Traveler Photo Contest 2013 7/2/13 2 Lawrence Berkeley National Laboratory U.S. Department of Energy | Office of Science The Science DMZ in 1 Slide Consists of three key components, all required: “Friction free” network path • Highly capable network devices (wire-speed, deep queues) • Virtual circuit connectivity option • Security policy and enforcement specific to science workflows • Located at or near site perimeter if possible Dedicated, high-performance Data Transfer Nodes (DTNs) • Hardware, operating system, libraries all optimized for transfer • Includes optimized data transfer tools such as Globus Online and GridFTP Performance measurement/test node • perfSONAR Details at http://fasterdata.es.net/science-dmz/ Lawrence Berkeley National Laboratory U.S. Department of Energy | Office of Science Overview Part 1: • What is ESnet? • Science DMZ Motivation • Science DMZ Architecture Part 2: • PerfSONAR • The Data Transfer Node • Data Transfer Tools Part 3: • Science DMZ Security Best Practices • Conclusions Lawrence Berkeley National Laboratory U.S. Department of Energy | Office of Science The Energy Sciences Network (ESnet) A Department of Energy Facility Naonal Fiber footprint Distributed Team of 35 Science Data Network Internaonal Collaboraons Mul3ple 10G waves 5 Lawrence Berkeley National Laboratory U.S. Department of Energy | Office of Science ESnetSC Supports Supports Research DOE at More Office than 300 of Institutions Science Across the U.S. Universities DOE laboratories The Office of Science supports: 27,000 Ph.D.s, graduate students, undergraduates, engineers, and technicians 26,000 users of open-access facilities 300 leading academic institutions 17 DOE laboratories 6 Lawrence Berkeley National Laboratory U.S.
    [Show full text]
  • SL8500 Modular Library System
    StorageTek SL8500 Modular Library System Systems Assurance Guide Part Number: MT9229 May 2010 Revision: L Submit comments about this document by clicking the Feedback [+] link at: http://docs.sun.com StorageTek SL8500 Modular Library System - Systems Assurance Guide MT9229 Revision: L Copyright © 2004, 2010, Oracle and/or its affiliates. All rights reserved. This software and related documentation are provided under a license agreement containing restrictions on use and disclosure and are protected by intellectual property laws. Except as expressly permitted in your license agreement or allowed by law, you may not use, copy, reproduce, translate, broadcast, modify, license, transmit, distribute, exhibit, perform, publish, or display any part, in any form, or by any means. Reverse engineering, disassembly, or decompilation of this software, unless required by law for interoperability, is prohibited. The information contained herein is subject to change without notice and is not warranted to be error-free. If you find any errors, please report them to us in writing. If this is software or related software documentation that is delivered to the U.S. Government or anyone licensing it on behalf of the U.S. Government, the following notice is applicable: U.S. GOVERNMENT RIGHTS Programs, software, databases, and related documentation and technical data delivered to U.S. Government customers are “commercial computer software” or “commercial technical data” pursuant to the applicable Federal Acquisition Regulation and agency-specific supplemental regulations. As such, the use, duplication, disclosure, modification, and adaptation shall be subject to the restrictions and license terms set forth in the applicable Government contract, and, to the extent applicable by the terms of the Government contract, the additional rights set forth in FAR 52.227-19, Commercial Computer Software License (December 2007).
    [Show full text]
  • Server Administration Manual Release Latest
    Nextcloud Server Administration Manual Release latest The Nextcloud developers Oct 01, 2021 CONTENTS 1 Introduction 1 1.1 Videos and blogs.............................................1 1.2 Target audience..............................................1 2 Release notes 3 3 Maintenance and release schedule5 3.1 Major releases..............................................5 3.2 Maintenance releases...........................................5 3.3 Older versions..............................................6 4 Installation and server configuration7 4.1 System requirements...........................................7 4.2 Deployment recommendations......................................9 4.3 Installation on Linux...........................................9 4.4 Installation wizard............................................ 17 4.5 Installing from command line...................................... 21 4.6 Supported apps.............................................. 22 4.7 SELinux configuration.......................................... 24 4.8 NGINX configuration.......................................... 27 4.9 Hardening and security guidance.................................... 36 4.10 Server tuning............................................... 40 4.11 Example installation on Ubuntu 20.04 LTS............................... 42 4.12 Example installation on CentOS 8.................................... 44 4.13 Example installation on OpenBSD.................................... 48 5 Nextcloud configuration 53 5.1 Warnings on admin page........................................
    [Show full text]
  • Installing Freepbx 13 on Centos 7
    Installing FreePBX 13 on CentOS 7 READ FIRST Manual installations of FreePBX is considered an EXPERTS ONLY exercise. This method of installation is enough to get CORE functionality of FreePBX. Non-commercial modules may not function as expected or detailed in the Wiki's. Certain modules and features may require additional software to be installed and configured on the server. **** COMMERCIAL MODULES CANNOT BE INSTALLED ON THIS OS **** Install Centos 7 **** COMMERCIAL MODULES CANNOT BE INSTALLED ON THIS OS **** Install Centos 7 Initial System Setup Disable selinux Update Your System Install Additional Required Dependencies Install Legacy Pear requirements Firewalld Basic Configuration Enable and Start MariaDB Enable and Start Apache Install Dependencies for Google Voice (if required) Install iksemel Add the Asterisk User Install and Configure Asterisk Download Asterisk source files. Compile and install DAHDI Compile and install pjproject Compile and Install jansson Compile and install Asterisk Install Asterisk Soundfiles. Set Asterisk ownership permissions. Install and Configure FreePBX A few small modifications to Apache. Download and install FreePBX. That's it! Automatic Startup Initial System Setup You MUST run all of these commands as the root user! You MUST disable selinux. selinux can cause strange behavior during the install Disable selinux In /etc/sysconfig/selinux , change the following lines: sed -i 's/\(^SELINUX=\).*/\SELINUX=disabled/' /etc/sysconfig/selinux sed -i 's/\(^SELINUX=\).*/\SELINUX=disabled/' /etc/selinux/config reboot,
    [Show full text]
  • Encryption Suite
    comforte_Encryption_Suite.qxp_comforte_Encryption_Suite 29.10.17 13:33 Seite 1 comForte´scomforte’s encryptionencryptio nsuite suite ProtectProtect passwords passwords andand confidentialconfidential applicationapplication data data on on HP HP NonStopE Nonsto psystems systems SSecurCSecurCS Se SecurTNcurTN Se SecurFTPcurFTP Sec SecurLiburLib Secu SecurSHrSH Secu SecurPrintrPrint communication is our Forte comforte_Encryption_Suite.qxp_comforte_Encryption_Suite 29.10.17 13:33 Seite 2 Overview comForte offers a rich set of products The following diagram shows all products All our products take advantage of the most depending on the protocol you want to together. This diagram may look confusing widely used and accepted security protocols: encrypt. Even for a single protocol (such at first glance, but we do believe that our Depending on the product, connections are as Telnet) we offer different solutions rich set of products allows us to tailor our secured either via SSL (Secure Sockets Layer, depending on your requirements. solutions according to the customers’ now standardized by the IETF as Transport requirements rather than according to our Layer Security – TLS) or via SSH2 (Secure Shell product set. The purpose of this flyer is to protocol version 2). provide an overview of the different products and to help you find the right solution for All our solutions can restrict access to your your requirements. NonStop system to “encrypted only” and also provide some basic firewall capabilities. comforte_Encryption_Suite.qxp_comforte_Encryption_Suite 29.10.17 13:33 Seite 3 Telnet Encryption Many organizations are realizing that using Webbrowser access to NonStop 6530 single, integrated product. SecurTN replaces Telnet over a heterogenous TCP/IP network and 3270 applications and services, TELSERV, thereby eliminating the “256 session results in reduced security: all protective delivering them to users both inside only” limit of TELSERV.
    [Show full text]
  • Emacspeak User's Guide
    Emacspeak User's Guide Jennifer Jobst Revision History Revision 1.3 July 24,2002 Revised by: SDS Updated the maintainer of this document to Sharon Snider, corrected links, and converted to HTML Revision 1.2 December 3, 2001 Revised by: JEJ Changed license to GFDL Revision 1.1 November 12, 2001 Revised by: JEJ Revision 1.0 DRAFT October 19, 2001 Revised by: JEJ This document helps Emacspeak users become familiar with Emacs as an audio desktop and provides tutorials on many common tasks and the Emacs applications available to perform those tasks. Emacspeak User's Guide Table of Contents 1. Legal Notice.....................................................................................................................................................1 2. Introduction.....................................................................................................................................................2 2.1. What is Emacspeak?.........................................................................................................................2 2.2. About this tutorial.............................................................................................................................2 3. Before you begin..............................................................................................................................................3 3.1. Getting started with Emacs and Emacspeak.....................................................................................3 3.2. Emacs Command Conventions.........................................................................................................3
    [Show full text]
  • GNU Wget 1.10 the Non-Interactive Download Utility Updated for Wget 1.10, Apr 2005
    GNU Wget 1.10 The non-interactive download utility Updated for Wget 1.10, Apr 2005 by Hrvoje Nikˇsi´cand the developers Copyright c 1996–2005, Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with the Invariant Sections being “GNU General Public License” and “GNU Free Documentation License”, with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is included in the section entitled “GNU Free Documentation License”. Chapter 1: Overview 1 1 Overview GNU Wget is a free utility for non-interactive download of files from the Web. It supports http, https, and ftp protocols, as well as retrieval through http proxies. This chapter is a partial overview of Wget’s features. • Wget is non-interactive, meaning that it can work in the background, while the user is not logged on. This allows you to start a retrieval and disconnect from the system, letting Wget finish the work. By contrast, most of the Web browsers require constant user’s presence, which can be a great hindrance when transferring a lot of data. • Wget can follow links in html and xhtml pages and create local versions of remote web sites, fully recreating the directory structure of the original site. This is sometimes referred to as “recursive downloading.” While doing that, Wget respects the Robot Exclusion Standard (‘/robots.txt’). Wget can be instructed to convert the links in downloaded html files to the local files for offline viewing.
    [Show full text]
  • Continuous Auditing of SSH Servers to Mitigate Brute-Force Attacks Phuong M
    CAUDIT: Continuous Auditing of SSH Servers To Mitigate Brute-Force Attacks Phuong M. Cao, Yuming Wu, and Subho S. Banerjee, UIUC; Justin Azoff and Alex Withers, NCSA; Zbigniew T. Kalbarczyk and Ravishankar K. Iyer, UIUC https://www.usenix.org/conference/nsdi19/presentation/cao This paper is included in the Proceedings of the 16th USENIX Symposium on Networked Systems Design and Implementation (NSDI ’19). February 26–28, 2019 • Boston, MA, USA ISBN 978-1-931971-49-2 Open access to the Proceedings of the 16th USENIX Symposium on Networked Systems Design and Implementation (NSDI ’19) is sponsored by CAUDIT: Continuous Auditing of SSH Servers to Mitigate Brute-Force Attacks Phuong M. Cao1, Yuming Wu1, Subho S. Banerjee1, Justin Azoff2;3, Alexander Withers3, Zbigniew T. Kalbarczyk1, Ravishankar K. Iyer1 1University of Illinois at Urbana-Champaign, 2Corelight, 3National Center for Supercomputing Applications Abstract While only a small fraction of such attempts succeed, they This paper describes CAUDIT1, an operational system have led to major misuses in 51% of 1,800 surveyed organi- deployed at the National Center for Supercomputing Applica- zations, with a financial impact of up to $500,000 per organi- tions (NCSA) at the University of Illinois. CAUDIT is a fully zation [7]. automated system that enables the identification and exclusion This paper describes the production deployment of of hosts that are vulnerable to SSH brute-force attacks. Its CAUDIT at the National Center for Supercomputing Ap- key features include: 1) a honeypot for attracting SSH-based plications (NCSA) at the University of Illinois over a period attacks over a /16 IP address range and extracting key meta- of 463 days.
    [Show full text]
  • Scripting the Openssh, SFTP, and SCP Utilities on I Scott Klement
    Scripting the OpenSSH, SFTP, and SCP Utilities on i Presented by Scott Klement http://www.scottklement.com © 2010-2015, Scott Klement Why do programmers get Halloween and Christmas mixed-up? 31 OCT = 25 DEC Objectives Of This Session • Setting up OpenSSH on i • The OpenSSH tools: SSH, SFTP and SCP • How do you use them? • How do you automate them so they can be run from native programs (CL programs) 2 What is SSH SSH is short for "Secure Shell." Created by: • Tatu Ylönen (SSH Communications Corp) • Björn Grönvall (OSSH – short lived) • OpenBSD team (led by Theo de Raadt) The term "SSH" can refer to a secured network protocol. It also can refer to the tools that run over that protocol. • Secure replacement for "telnet" • Secure replacement for "rcp" (copying files over a network) • Secure replacement for "ftp" • Secure replacement for "rexec" (RUNRMTCMD) 3 What is OpenSSH OpenSSH is an open source (free) implementation of SSH. • Developed by the OpenBSD team • but it's available for all major OSes • Included with many operating systems • BSD, Linux, AIX, HP-UX, MacOS X, Novell NetWare, Solaris, Irix… and yes, IBM i. • Integrated into appliances (routers, switches, etc) • HP, Nokia, Cisco, Digi, Dell, Juniper Networks "Puffy" – OpenBSD's Mascot The #1 SSH implementation in the world. • More than 85% of all SSH installations. • Measured by ScanSSH software. • You can be sure your business partners who use SSH will support OpenSSH 4 Included with IBM i These must be installed (all are free and shipped with IBM i **) • 57xx-SS1, option 33 = PASE • 5733-SC1, *BASE = Portable Utilities • 5733-SC1, option 1 = OpenSSH, OpenSSL, zlib • 57xx-SS1, option 30 = QShell (useful, not required) ** in v5r3, had 5733-SC1 had to be ordered separately (no charge.) In v5r4 or later, it's shipped automatically.
    [Show full text]
  • Linux Networking Cookbook.Pdf
    Linux Networking Cookbook ™ Carla Schroder Beijing • Cambridge • Farnham • Köln • Paris • Sebastopol • Taipei • Tokyo Linux Networking Cookbook™ by Carla Schroder Copyright © 2008 O’Reilly Media, Inc. All rights reserved. Printed in the United States of America. Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472. O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (safari.oreilly.com). For more information, contact our corporate/institutional sales department: (800) 998-9938 or [email protected]. Editor: Mike Loukides Indexer: John Bickelhaupt Production Editor: Sumita Mukherji Cover Designer: Karen Montgomery Copyeditor: Derek Di Matteo Interior Designer: David Futato Proofreader: Sumita Mukherji Illustrator: Jessamyn Read Printing History: November 2007: First Edition. Nutshell Handbook, the Nutshell Handbook logo, and the O’Reilly logo are registered trademarks of O’Reilly Media, Inc. The Cookbook series designations, Linux Networking Cookbook, the image of a female blacksmith, and related trade dress are trademarks of O’Reilly Media, Inc. Java™ is a trademark of Sun Microsystems, Inc. .NET is a registered trademark of Microsoft Corporation. Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this book, and O’Reilly Media, Inc. was aware of a trademark claim, the designations have been printed in caps or initial caps. While every precaution has been taken in the preparation of this book, the publisher and author assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein.
    [Show full text]