| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
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| 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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| 7 |
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| 8 | <chapter id="postlfs-security">
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| 9 | <?dbhtml filename="security.html"?>
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| 10 |
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| 11 | <title>Security</title>
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| 12 |
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| 13 | <para>Security takes many forms in a computing environment. This chapter
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| 14 | gives examples of three different types of security: access, prevention
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| 15 | and detection.</para>
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| 16 |
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| 17 | <para>Access for users is usually handled by <command>login</command> or an
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| 18 | application designed to handle the login function. In this chapter, we show
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| 19 | how to enhance <command>login</command> by setting policies with
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| 20 | <application>PAM</application> modules. Access via networks
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| 21 | can also be secured by policies set by <application>iptables</application>,
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| 22 | commonly referred to as a firewall. The Network Security Services (NSS) and
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| 23 | Netscape Portable Runtime (NSPR) libraries can be installed and shared among
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| 24 | the many applications requiring them. For applications that don't offer the
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| 25 | best security, you can use the <application>Stunnel</application> package to
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| 26 | wrap an application daemon inside an SSL tunnel.</para>
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| 27 |
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| 28 | <para>Prevention of breaches, like a trojan, are assisted by applications like
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| 29 | <application>GnuPG</application>, specifically the ability to confirm signed
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| 30 | packages, which recognizes modifications of the tarball
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| 31 | after the packager creates it.</para>
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| 32 |
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| 33 | <para> Finally, we touch on detection with a package that stores "signatures"
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| 34 | of critical files (defined by the administrator) and then regenerates those
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| 35 | "signatures" and compares for files that have been changed.</para>
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| 36 |
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| 37 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="openssl.xml"/>
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| 38 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="cracklib.xml"/>
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| 39 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="linux-pam.xml"/>
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| 40 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="shadow.xml"/>
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| 41 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="iptables.xml"/>
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| 42 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="firewalling.xml"/>
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| 43 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="gnupg.xml"/>
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| 44 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="tripwire.xml"/>
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| 45 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="heimdal.xml"/>
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| 46 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="mitkrb.xml"/>
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| 47 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="cyrus-sasl.xml"/>
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| 48 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="stunnel.xml"/>
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| 49 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="sudo.xml"/>
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| 50 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="nss.xml"/>
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| 51 |
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| 52 | </chapter>
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