| 1 | <?xml version="1.0" encoding="UTF-8"?>
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| 2 | <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/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>
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| 14 | Security takes many forms in a computing environment. After some
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| 15 | initial discussion, this chapter
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| 16 | gives examples of three different types of security: access, prevention
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| 17 | and detection.
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| 18 | </para>
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| 19 |
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| 20 | <para>
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| 21 | Access for users is usually handled by <command>login</command> or an
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| 22 | application designed to handle the login function. In this chapter, we show
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| 23 | how to enhance <command>login</command> by setting policies with
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| 24 | <application>PAM</application> modules. Access via networks can also be
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| 25 | secured by policies set by <application>iptables</application>, commonly
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| 26 | referred to as a firewall. The Network Security Services (NSS) and
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| 27 | Netscape Portable Runtime (NSPR) libraries can be installed and shared
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| 28 | among the many applications requiring them. For applications that don't
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| 29 | offer the best security, you can use the
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| 30 | <application>Stunnel</application> package to wrap an application daemon
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| 31 | inside an SSL tunnel.
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| 32 | </para>
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| 33 |
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| 34 | <para>
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| 35 | Prevention of breaches, like a trojan, are assisted by applications like
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| 36 | <application>GnuPG</application>, specifically the ability to confirm
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| 37 | signed packages, which recognizes modifications of the tarball
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| 38 | after the packager creates it.
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| 39 | </para>
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| 40 |
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| 41 | <para>
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| 42 | Finally, we touch on detection with a package that stores "signatures"
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| 43 | of critical files (defined by the administrator) and then regenerates those
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| 44 | "signatures" and compares for files that have been changed.
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| 45 | </para>
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| 46 |
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| 47 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="vulnerabilities.xml"/>
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| 48 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="make-ca.xml"/>
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| 49 |
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| 50 | <!-- sysv only -->
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| 51 | <!--<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="consolekit.xml"/>-->
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| 52 |
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| 53 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="cracklib.xml"/>
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| 54 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="cryptsetup.xml"/>
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| 55 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="cyrus-sasl.xml"/>
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| 56 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="gnupg2.xml"/>
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| 57 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="gnutls.xml"/>
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| 58 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="gpgme.xml"/>
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| 59 | <!-- archive
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| 60 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="haveged.xml"/>
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| 61 | -->
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| 62 | <!-- Leave in alphabetical order of now -->
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| 63 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="iptables.xml"/>
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| 64 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="firewalling.xml"/>
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| 65 |
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| 66 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="libcap.xml"/>
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| 67 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="linux-pam.xml"/>
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| 68 |
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| 69 | <!-- systemd only -->
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| 70 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="liboauth.xml"/>
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| 71 |
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| 72 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="libpwquality.xml"/>
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| 73 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="mitkrb.xml"/>
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| 74 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="nettle.xml"/>
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| 75 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="nss.xml"/>
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| 76 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="openssh.xml"/>
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| 77 | <!-- <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="openssl.xml"/> -->
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| 78 | <!-- <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="openssl10.xml"/> -->
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| 79 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="p11-kit.xml"/>
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| 80 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="polkit.xml"/>
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| 81 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="polkit-gnome.xml"/>
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| 82 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="shadow.xml"/>
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| 83 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="ssh-askpass.xml"/>
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| 84 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="stunnel.xml"/>
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| 85 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="sudo.xml"/>
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| 86 | <!-- comment out until shadow really abandon su -->
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| 87 | <!--xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="util-linux.xml"/-->
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| 88 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="tripwire.xml"/>
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| 89 | <!-- <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="volume_key.xml"/>-->
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| 90 | <!-- <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="firewalling.xml"/>
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| 91 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="iptables.xml"/>
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| 92 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="nftables.xml"/>
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| 93 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="firewalld.xml"/>-->
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| 94 |
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| 95 | </chapter>
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