[b4b71892] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[6732c094] | 2 | <!DOCTYPE sect1 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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[b4b71892] | 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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| 6 |
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[fce275e] | 7 | <!ENTITY cracklib-download-http "&sourceforge-repo;/cracklib/cracklib-&cracklib-version;.tar.gz">
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[fb2e525] | 8 | <!ENTITY cracklib-download-ftp "&gentoo-ftp-repo;/cracklib-&cracklib-version;.tar.gz">
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[d456f78c] | 9 | <!ENTITY cracklib-md5sum "ca0ec168d9c6466612204e8dfb2df8a9">
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| 10 | <!ENTITY cracklib-size "604 KB">
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[c24c91c] | 11 | <!ENTITY cracklib-buildsize "29 MB">
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| 12 | <!ENTITY cracklib-time "less than 0.1 SBU">
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[1f4d911] | 13 |
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[a4440544] | 14 | <!ENTITY crackdict-version "20080507">
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| 15 | <!ENTITY crackdict-download "&sourceforge-repo;/cracklib/cracklib-words-&crackdict-version;.gz">
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| 16 | <!ENTITY crackdict-size "4.5 MB">
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| 17 | <!ENTITY crackdict-md5sum "7fa6ba0cd50e7f9ccaf4707c810b14f1">
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[b4b71892] | 18 | ]>
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| 19 |
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[8b1b2dc7] | 20 | <sect1 id="cracklib" xreflabel="CrackLib-&cracklib-version;">
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[9623b6e8] | 21 | <?dbhtml filename="cracklib.html"?>
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| 22 |
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| 23 | <sect1info>
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| 24 | <othername>$LastChangedBy$</othername>
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| 25 | <date>$Date$</date>
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| 26 | </sect1info>
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| 27 |
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[8b1b2dc7] | 28 | <title>CrackLib-&cracklib-version;</title>
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[9623b6e8] | 29 |
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| 30 | <indexterm zone="cracklib">
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[8b1b2dc7] | 31 | <primary sortas="a-CrackLib">CrackLib</primary>
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[9623b6e8] | 32 | </indexterm>
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| 33 |
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| 34 | <sect2 role="package">
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[8b1b2dc7] | 35 | <title>Introduction to CrackLib</title>
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[9623b6e8] | 36 |
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[8b1b2dc7] | 37 | <para>The <application>CrackLib</application> package contains a
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[0afcfa88] | 38 | library used to enforce strong passwords by comparing user selected
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[8b1b2dc7] | 39 | passwords to words in chosen word lists.</para>
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[9623b6e8] | 40 |
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[60ecc5bb] | 41 | &lfs72_checked;
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[5f4181d] | 42 |
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[9623b6e8] | 43 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 44 | <itemizedlist spacing="compact">
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| 45 | <listitem>
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| 46 | <para>Download (HTTP): <ulink url="&cracklib-download-http;"/></para>
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| 47 | </listitem>
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| 48 | <listitem>
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| 49 | <para>Download (FTP): <ulink url="&cracklib-download-ftp;"/></para>
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| 50 | </listitem>
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| 51 | <listitem>
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[84fcbc2] | 52 | <para>Download MD5 sum: &cracklib-md5sum;</para>
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[9623b6e8] | 53 | </listitem>
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| 54 | <listitem>
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| 55 | <para>Download size: &cracklib-size;</para>
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| 56 | </listitem>
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| 57 | <listitem>
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| 58 | <para>Estimated disk space required: &cracklib-buildsize;</para>
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| 59 | </listitem>
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| 60 | <listitem>
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| 61 | <para>Estimated build time: &cracklib-time;</para>
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| 62 | </listitem>
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| 63 | </itemizedlist>
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| 64 |
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| 65 | <bridgehead renderas="sect3">Additional Downloads</bridgehead>
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| 66 | <itemizedlist spacing='compact'>
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| 67 | <listitem>
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[62494cc] | 68 | <para>Recommended word list for English-speaking countries (size:
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[22861b3] | 69 | &crackdict-size;; md5sum: &crackdict-md5sum;):
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| 70 | <ulink url="&crackdict-download;"/></para>
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| 71 | </listitem>
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[9623b6e8] | 72 | </itemizedlist>
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| 73 |
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[62494cc] | 74 | <para>There are additional word lists available for download, e.g., from
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| 75 | <ulink url="http://www.cotse.com/tools/wordlists.htm"/>.
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| 76 | <application>CrackLib</application> can utilize as many, or as few word
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| 77 | lists you choose to install.</para>
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| 78 |
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[22861b3] | 79 | <important>
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| 80 | <para>Users tend to base their passwords on regular words of the spoken
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| 81 | language, and crackers know that. <application>CrackLib</application> is
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| 82 | intended to filter out such bad passwords at the source using a
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| 83 | dictionary created from word lists. To accomplish this, the word list(s)
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| 84 | for use with <application>CrackLib</application> must be an exhaustive
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| 85 | list of words and word-based keystroke combinations likely to be chosen
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| 86 | by users of the system as (guessable) passwords.</para>
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| 87 |
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| 88 | <para>The default word list recommended above for downloading mostly
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| 89 | satisfies this role in English-speaking countries. In other situations,
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| 90 | it may be necessary to download (or even create) additional word
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| 91 | lists.</para>
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| 92 |
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| 93 | <para>Note that word lists suitable for spell-checking are not usable
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| 94 | as <application>CrackLib</application> word lists in countries with
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| 95 | non-Latin based alphabets, because of <quote>word-based keystroke
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| 96 | combinations</quote> that make bad passwords.</para>
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| 97 | </important>
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[9623b6e8] | 98 |
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[14e13a0c] | 99 | <bridgehead renderas="sect3">CrackLib Dependencies</bridgehead>
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[bccbdaea] | 100 |
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[14e13a0c] | 101 | <bridgehead renderas="sect4">Optional</bridgehead>
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[4716d52] | 102 | <para role="optional"><xref linkend="python2"/></para>
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[14e13a0c] | 103 |
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[3597eb6] | 104 | <para condition="html" role="usernotes">User Notes:
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| 105 | <ulink url="&blfs-wiki;/cracklib"/></para>
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| 106 |
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[9623b6e8] | 107 | </sect2>
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| 108 |
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| 109 | <sect2 role="installation">
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[8b1b2dc7] | 110 | <title>Installation of CrackLib</title>
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[4f65b2f] | 111 |
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[8b1b2dc7] | 112 | <para>Install <application>CrackLib</application> by running the following
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| 113 | commands:</para>
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[b4b71892] | 114 |
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[1976445] | 115 | <screen><userinput>./configure --prefix=/usr \
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| 116 | --with-default-dict=/lib/cracklib/pw_dict &&
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[8b1b2dc7] | 117 | make</userinput></screen>
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[b4b71892] | 118 |
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[8b1b2dc7] | 119 | <para>Now, as the <systemitem class="username">root</systemitem> user:</para>
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[9623b6e8] | 120 |
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| 121 | <screen role="root"><userinput>make install &&
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[8b1b2dc7] | 122 | mv -v /usr/lib/libcrack.so.2* /lib &&
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[5f4181d] | 123 | ln -v -sf ../../lib/libcrack.so.2.8.1 /usr/lib/libcrack.so</userinput></screen>
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[22861b3] | 124 |
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[1976445] | 125 | <para>Issue the following commands as the
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| 126 | <systemitem class="username">root</systemitem> user to install the
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| 127 | recommended word list and create the <application>CrackLib</application>
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| 128 | dictionary. Other word lists (text based, one word per line) can also be
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| 129 | used by simply installing them into
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| 130 | <filename class='directory'>/usr/share/dict</filename> and adding them
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| 131 | to the <command>create-cracklib-dict</command> command.</para>
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[22861b3] | 132 |
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[a4440544] | 133 | <screen role="root"><userinput>install -v -m644 -D ../cracklib-words-&crackdict-version;.gz \
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[8b1b2dc7] | 134 | /usr/share/dict/cracklib-words.gz &&
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| 135 | gunzip -v /usr/share/dict/cracklib-words.gz &&
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| 136 | ln -v -s cracklib-words /usr/share/dict/words &&
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| 137 | echo $(hostname) >>/usr/share/dict/cracklib-extra-words &&
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[1976445] | 138 | install -v -m755 -d /lib/cracklib &&
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[8b1b2dc7] | 139 | create-cracklib-dict /usr/share/dict/cracklib-words \
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| 140 | /usr/share/dict/cracklib-extra-words</userinput></screen>
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| 141 |
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| 142 | <para>If desired, check the proper operation of the library as an
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[a4440544] | 143 | unprivileged user by issuing the following command:</para>
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| 144 |
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| 145 | <screen><userinput>make test</userinput></screen>
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[9623b6e8] | 146 |
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[c6bdcb0] | 147 | <important>
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| 148 | <para>If you are installing <application>CrackLib</application> after
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| 149 | your LFS system has been completed and you have the
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| 150 | <application>Shadow</application> package installed, you must
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| 151 | reinstall <xref linkend="shadow"/> if you wish to provide strong
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| 152 | password support on your system. If you are now going to install the
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| 153 | <xref linkend="linux-pam"/> package, you may disregard this note as
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| 154 | <application>Shadow</application> will be reinstalled after the
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| 155 | <application>Linux-PAM</application> installation.</para>
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| 156 | </important>
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| 157 |
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[9623b6e8] | 158 | </sect2>
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| 159 |
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| 160 | <sect2 role="commands">
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| 161 | <title>Command Explanations</title>
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| 162 |
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[1976445] | 163 | <para><parameter>--with-default-dict=/lib/cracklib/pw_dict</parameter>:
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| 164 | This parameter forces the installation of the
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| 165 | <application>CrackLib</application> dictionary to the
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[8b1b2dc7] | 166 | <filename class='directory'>/lib</filename> hierarchy.</para>
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| 167 |
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| 168 | <para><command>mv -v /usr/lib/libcrack.so.2* /lib</command> and
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[5f4181d] | 169 | <command>ln -v -sf ../../lib/libcrack.so.2.8.1 ...</command>: These two
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| 170 | commands move the <filename class='libraryfile'>libcrack.so.2.8.1</filename>
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[8b1b2dc7] | 171 | library and associated symlink from
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| 172 | <filename class='directory'>/usr/lib</filename> to
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| 173 | <filename class='directory'>/lib</filename>, then recreates the
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[b26339be] | 174 | <filename class='symlink'>/usr/lib/libcrack.so</filename> symlink pointing
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[8b1b2dc7] | 175 | to the relocated file.</para>
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| 176 |
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| 177 | <para><command>install -v -m644 -D ...</command>: This command creates the
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| 178 | <filename class='directory'>/usr/share/dict</filename> directory (if it
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| 179 | doesn't already exist) and installs the compressed word list there.</para>
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| 180 |
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| 181 | <para><command>ln -v -s cracklib-words /usr/share/dict/words</command>: The
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| 182 | word list is linked to <filename>/usr/share/dict/words</filename> as
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| 183 | historically, <filename>words</filename> is the primary word list in the
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| 184 | <filename class="directory">/usr/share/dict</filename> directory. Omit this
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| 185 | command if you already have a <filename>/usr/share/dict/words</filename>
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| 186 | file installed on your system.</para>
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| 187 |
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| 188 | <para><command>echo $(hostname) >>...</command>: The value of
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| 189 | <command>hostname</command> is echoed to a file called
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| 190 | <filename>cracklib-extra-words</filename>. This extra file is intended to be
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| 191 | a site specific list which includes easy to guess passwords such as company
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| 192 | or department names, user's names, product names, computer names, domain
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| 193 | names, etc.</para>
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| 194 |
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| 195 | <para><command>create-cracklib-dict ...</command>: This command creates the
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[22861b3] | 196 | <application>CrackLib</application> dictionary from the word lists. Modify
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| 197 | the command to add any additional word lists you have installed.</para>
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[9623b6e8] | 198 |
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| 199 | </sect2>
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| 200 |
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| 201 | <sect2 role="content">
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| 202 | <title>Contents</title>
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| 203 |
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| 204 | <segmentedlist>
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| 205 | <segtitle>Installed Programs</segtitle>
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| 206 | <segtitle>Installed Libraries</segtitle>
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[d80152af] | 207 | <segtitle>Installed Directories</segtitle>
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[9623b6e8] | 208 |
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| 209 | <seglistitem>
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[8b1b2dc7] | 210 | <seg>cracklib-check, cracklib-format, cracklib-packer,
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| 211 | cracklib-unpacker and create-cracklib-dict</seg>
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[d456f78c] | 212 |
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| 213 | <seg>libcrack.so and the _cracklibmodule.{so,a}
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| 214 | <application>Python</application> module</seg>
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| 215 |
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[1976445] | 216 | <seg>/lib/cracklib, /usr/share/dict and /usr/share/cracklib</seg>
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[9623b6e8] | 217 | </seglistitem>
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| 218 | </segmentedlist>
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| 219 |
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| 220 | <variablelist>
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| 221 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 222 | <?dbfo list-presentation="list"?>
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| 223 | <?dbhtml list-presentation="table"?>
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| 224 |
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[8b1b2dc7] | 225 | <varlistentry id="create-cracklib-dict">
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[0170790e] | 226 | <term><command>create-cracklib-dict</command></term>
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[8b1b2dc7] | 227 | <listitem>
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| 228 | <para>is used to create the <application>CrackLib</application>
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| 229 | dictionary from the given word list(s).</para>
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| 230 | <indexterm zone="cracklib create-cracklib-dict">
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| 231 | <primary sortas="b-create-cracklib-dict">create-cracklib-dict</primary>
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| 232 | </indexterm>
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| 233 | </listitem>
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| 234 | </varlistentry>
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| 235 |
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[9623b6e8] | 236 | <varlistentry id="libcrack">
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[d456f78c] | 237 | <term><filename class='libraryfile'>libcrack.so</filename></term>
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[9623b6e8] | 238 | <listitem>
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[8b1b2dc7] | 239 | <para>provides a fast dictionary lookup method for strong
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[9623b6e8] | 240 | password enforcement.</para>
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| 241 | <indexterm zone="cracklib libcrack">
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[d456f78c] | 242 | <primary sortas="c-libcrack">libcrack.so</primary>
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[9623b6e8] | 243 | </indexterm>
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| 244 | </listitem>
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| 245 | </varlistentry>
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| 246 |
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| 247 | </variablelist>
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| 248 |
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| 249 | </sect2>
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[fa48bf3] | 250 |
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| 251 | </sect1>
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