[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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[9912ce81] | 7 | <!ENTITY cracklib-url "https://github.com/cracklib/cracklib/releases/download">
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| 8 |
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| 9 | <!ENTITY cracklib-download-http "&cracklib-url;/cracklib-&cracklib-version;/cracklib-&cracklib-version;.tar.gz">
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[306fb0e] | 10 | <!ENTITY cracklib-download-ftp " ">
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[9912ce81] | 11 | <!ENTITY cracklib-md5sum "c52f463585d85924b28cdc1e373ae06d">
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| 12 | <!ENTITY cracklib-size "628 KB">
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[df9df07] | 13 | <!ENTITY cracklib-buildsize "3.8 MB">
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[9912ce81] | 14 | <!ENTITY cracklib-time "less than 0.1 SBU">
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[1f4d911] | 15 |
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[9912ce81] | 16 | <!ENTITY crackdict-download "&cracklib-url;/cracklib-&cracklib-version;/cracklib-words-&cracklib-version;.gz">
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| 17 | <!ENTITY crackdict-size "5.3 MB">
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| 18 | <!ENTITY crackdict-md5sum "cae1257e3a9f95c917cc9dbbab852316">
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[b4b71892] | 19 | ]>
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| 20 |
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[8b1b2dc7] | 21 | <sect1 id="cracklib" xreflabel="CrackLib-&cracklib-version;">
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[9623b6e8] | 22 | <?dbhtml filename="cracklib.html"?>
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| 23 |
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| 24 | <sect1info>
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| 25 | <othername>$LastChangedBy$</othername>
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| 26 | <date>$Date$</date>
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| 27 | </sect1info>
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| 28 |
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[8b1b2dc7] | 29 | <title>CrackLib-&cracklib-version;</title>
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[9623b6e8] | 30 |
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| 31 | <indexterm zone="cracklib">
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[8b1b2dc7] | 32 | <primary sortas="a-CrackLib">CrackLib</primary>
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[9623b6e8] | 33 | </indexterm>
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| 34 |
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| 35 | <sect2 role="package">
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[8b1b2dc7] | 36 | <title>Introduction to CrackLib</title>
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[9623b6e8] | 37 |
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[8b1b2dc7] | 38 | <para>The <application>CrackLib</application> package contains a
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[0afcfa88] | 39 | library used to enforce strong passwords by comparing user selected
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[8b1b2dc7] | 40 | passwords to words in chosen word lists.</para>
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[9623b6e8] | 41 |
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[a2c3ec79] | 42 | &lfs79_checked;&gcc6_checked;
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[5f4181d] | 43 |
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[9623b6e8] | 44 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 45 | <itemizedlist spacing="compact">
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| 46 | <listitem>
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| 47 | <para>Download (HTTP): <ulink url="&cracklib-download-http;"/></para>
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| 48 | </listitem>
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| 49 | <listitem>
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| 50 | <para>Download (FTP): <ulink url="&cracklib-download-ftp;"/></para>
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| 51 | </listitem>
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| 52 | <listitem>
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[84fcbc2] | 53 | <para>Download MD5 sum: &cracklib-md5sum;</para>
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[9623b6e8] | 54 | </listitem>
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| 55 | <listitem>
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| 56 | <para>Download size: &cracklib-size;</para>
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| 57 | </listitem>
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| 58 | <listitem>
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| 59 | <para>Estimated disk space required: &cracklib-buildsize;</para>
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| 60 | </listitem>
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| 61 | <listitem>
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| 62 | <para>Estimated build time: &cracklib-time;</para>
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| 63 | </listitem>
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| 64 | </itemizedlist>
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| 65 |
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| 66 | <bridgehead renderas="sect3">Additional Downloads</bridgehead>
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[8f1699f2] | 67 | <itemizedlist spacing="compact">
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[9623b6e8] | 68 | <listitem>
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[62494cc] | 69 | <para>Recommended word list for English-speaking countries (size:
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[22861b3] | 70 | &crackdict-size;; md5sum: &crackdict-md5sum;):
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| 71 | <ulink url="&crackdict-download;"/></para>
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| 72 | </listitem>
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[9623b6e8] | 73 | </itemizedlist>
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| 74 |
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[62494cc] | 75 | <para>There are additional word lists available for download, e.g., from
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| 76 | <ulink url="http://www.cotse.com/tools/wordlists.htm"/>.
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| 77 | <application>CrackLib</application> can utilize as many, or as few word
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| 78 | lists you choose to install.</para>
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| 79 |
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[22861b3] | 80 | <important>
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| 81 | <para>Users tend to base their passwords on regular words of the spoken
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| 82 | language, and crackers know that. <application>CrackLib</application> is
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| 83 | intended to filter out such bad passwords at the source using a
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| 84 | dictionary created from word lists. To accomplish this, the word list(s)
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| 85 | for use with <application>CrackLib</application> must be an exhaustive
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| 86 | list of words and word-based keystroke combinations likely to be chosen
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| 87 | by users of the system as (guessable) passwords.</para>
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| 88 |
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| 89 | <para>The default word list recommended above for downloading mostly
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| 90 | satisfies this role in English-speaking countries. In other situations,
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| 91 | it may be necessary to download (or even create) additional word
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| 92 | lists.</para>
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| 93 |
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| 94 | <para>Note that word lists suitable for spell-checking are not usable
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| 95 | as <application>CrackLib</application> word lists in countries with
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| 96 | non-Latin based alphabets, because of <quote>word-based keystroke
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| 97 | combinations</quote> that make bad passwords.</para>
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| 98 | </important>
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[9623b6e8] | 99 |
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[14e13a0c] | 100 | <bridgehead renderas="sect3">CrackLib Dependencies</bridgehead>
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[bccbdaea] | 101 |
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[14e13a0c] | 102 | <bridgehead renderas="sect4">Optional</bridgehead>
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[8f1699f2] | 103 | <para role="optional">
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| 104 | <xref linkend="python2"/>
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| 105 | </para>
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[14e13a0c] | 106 |
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[3597eb6] | 107 | <para condition="html" role="usernotes">User Notes:
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[8f1699f2] | 108 | <ulink url="&blfs-wiki;/cracklib"/>
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| 109 | </para>
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[9623b6e8] | 110 | </sect2>
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| 111 |
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| 112 | <sect2 role="installation">
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[8b1b2dc7] | 113 | <title>Installation of CrackLib</title>
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[4f65b2f] | 114 |
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[8b1b2dc7] | 115 | <para>Install <application>CrackLib</application> by running the following
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| 116 | commands:</para>
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[b4b71892] | 117 |
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[806e763] | 118 | <screen><userinput>sed -i '/skipping/d' util/packer.c &&
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| 119 |
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| 120 | ./configure --prefix=/usr \
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| 121 | --disable-static \
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| 122 | --with-default-dict=/lib/cracklib/pw_dict &&
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[8b1b2dc7] | 123 | make</userinput></screen>
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[b4b71892] | 124 |
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[8b1b2dc7] | 125 | <para>Now, as the <systemitem class="username">root</systemitem> user:</para>
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[9623b6e8] | 126 |
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[806e763] | 127 | <screen role="root"><userinput>make install &&
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[7cadfea] | 128 | mv -v /usr/lib/libcrack.so.* /lib &&
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| 129 | ln -sfv ../../lib/$(readlink /usr/lib/libcrack.so) /usr/lib/libcrack.so</userinput></screen>
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[22861b3] | 130 |
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[1976445] | 131 | <para>Issue the following commands as the
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| 132 | <systemitem class="username">root</systemitem> user to install the
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| 133 | recommended word list and create the <application>CrackLib</application>
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| 134 | dictionary. Other word lists (text based, one word per line) can also be
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| 135 | used by simply installing them into
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[8f1699f2] | 136 | <filename class="directory">/usr/share/dict</filename> and adding them
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[1976445] | 137 | to the <command>create-cracklib-dict</command> command.</para>
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[22861b3] | 138 |
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[9912ce81] | 139 | <screen role="root"><userinput>install -v -m644 -D ../cracklib-words-&cracklib-version;.gz \
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[efd93087] | 140 | /usr/share/dict/cracklib-words.gz &&
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[806e763] | 141 |
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[efd93087] | 142 | gunzip -v /usr/share/dict/cracklib-words.gz &&
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| 143 | ln -v -sf cracklib-words /usr/share/dict/words &&
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| 144 | echo $(hostname) >> /usr/share/dict/cracklib-extra-words &&
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| 145 | install -v -m755 -d /lib/cracklib &&
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[806e763] | 146 |
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| 147 | create-cracklib-dict /usr/share/dict/cracklib-words \
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[efd93087] | 148 | /usr/share/dict/cracklib-extra-words</userinput></screen>
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[8b1b2dc7] | 149 |
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| 150 | <para>If desired, check the proper operation of the library as an
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[a4440544] | 151 | unprivileged user by issuing the following command:</para>
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| 152 |
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| 153 | <screen><userinput>make test</userinput></screen>
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[9623b6e8] | 154 |
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[c6bdcb0] | 155 | <important>
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| 156 | <para>If you are installing <application>CrackLib</application> after
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| 157 | your LFS system has been completed and you have the
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| 158 | <application>Shadow</application> package installed, you must
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| 159 | reinstall <xref linkend="shadow"/> if you wish to provide strong
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| 160 | password support on your system. If you are now going to install the
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| 161 | <xref linkend="linux-pam"/> package, you may disregard this note as
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| 162 | <application>Shadow</application> will be reinstalled after the
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| 163 | <application>Linux-PAM</application> installation.</para>
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| 164 | </important>
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| 165 |
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[9623b6e8] | 166 | </sect2>
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| 167 |
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| 168 | <sect2 role="commands">
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| 169 | <title>Command Explanations</title>
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| 170 |
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[806e763] | 171 | <para><command>sed -i '/skipping/d' util/packer.c</command>:
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| 172 | Remove a meaningless warning.</para>
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| 173 |
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[1976445] | 174 | <para><parameter>--with-default-dict=/lib/cracklib/pw_dict</parameter>:
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| 175 | This parameter forces the installation of the
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| 176 | <application>CrackLib</application> dictionary to the
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[8f1699f2] | 177 | <filename class="directory">/lib</filename> hierarchy.</para>
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| 178 |
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| 179 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
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| 180 | href="../../xincludes/static-libraries.xml"/>
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[8b1b2dc7] | 181 |
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| 182 | <para><command>mv -v /usr/lib/libcrack.so.2* /lib</command> and
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[5f4181d] | 183 | <command>ln -v -sf ../../lib/libcrack.so.2.8.1 ...</command>: These two
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[9912ce81] | 184 | commands move the <filename class="libraryfile">libcrack.so.2.9.0</filename>
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[8b1b2dc7] | 185 | library and associated symlink from
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[8f1699f2] | 186 | <filename class="directory">/usr/lib</filename> to
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| 187 | <filename class="directory">/lib</filename>, then recreates the
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| 188 | <filename class="symlink">/usr/lib/libcrack.so</filename> symlink pointing
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[8b1b2dc7] | 189 | to the relocated file.</para>
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| 190 |
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| 191 | <para><command>install -v -m644 -D ...</command>: This command creates the
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[8f1699f2] | 192 | <filename class="directory">/usr/share/dict</filename> directory (if it
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[8b1b2dc7] | 193 | doesn't already exist) and installs the compressed word list there.</para>
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| 194 |
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| 195 | <para><command>ln -v -s cracklib-words /usr/share/dict/words</command>: The
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| 196 | word list is linked to <filename>/usr/share/dict/words</filename> as
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| 197 | historically, <filename>words</filename> is the primary word list in the
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| 198 | <filename class="directory">/usr/share/dict</filename> directory. Omit this
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| 199 | command if you already have a <filename>/usr/share/dict/words</filename>
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| 200 | file installed on your system.</para>
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| 201 |
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| 202 | <para><command>echo $(hostname) >>...</command>: The value of
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| 203 | <command>hostname</command> is echoed to a file called
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| 204 | <filename>cracklib-extra-words</filename>. This extra file is intended to be
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| 205 | a site specific list which includes easy to guess passwords such as company
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| 206 | or department names, user's names, product names, computer names, domain
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| 207 | names, etc.</para>
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| 208 |
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| 209 | <para><command>create-cracklib-dict ...</command>: This command creates the
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[22861b3] | 210 | <application>CrackLib</application> dictionary from the word lists. Modify
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| 211 | the command to add any additional word lists you have installed.</para>
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[9623b6e8] | 212 |
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| 213 | </sect2>
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| 214 |
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| 215 | <sect2 role="content">
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| 216 | <title>Contents</title>
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| 217 |
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| 218 | <segmentedlist>
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| 219 | <segtitle>Installed Programs</segtitle>
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| 220 | <segtitle>Installed Libraries</segtitle>
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[d80152af] | 221 | <segtitle>Installed Directories</segtitle>
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[9623b6e8] | 222 |
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| 223 | <seglistitem>
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[8b1b2dc7] | 224 | <seg>cracklib-check, cracklib-format, cracklib-packer,
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| 225 | cracklib-unpacker and create-cracklib-dict</seg>
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[d456f78c] | 226 |
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[8f1699f2] | 227 | <seg>libcrack.so and the _cracklibmodule.so
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[d456f78c] | 228 | <application>Python</application> module</seg>
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[0d7900a] | 229 |
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[1976445] | 230 | <seg>/lib/cracklib, /usr/share/dict and /usr/share/cracklib</seg>
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[9623b6e8] | 231 | </seglistitem>
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| 232 | </segmentedlist>
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| 233 |
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| 234 | <variablelist>
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| 235 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 236 | <?dbfo list-presentation="list"?>
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| 237 | <?dbhtml list-presentation="table"?>
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| 238 |
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[efd93087] | 239 | <varlistentry id="cracklib-check">
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| 240 | <term><command>cracklib-check</command></term>
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| 241 | <listitem>
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| 242 | <para>is used to determine if a password is strong.</para>
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| 243 | <indexterm zone="cracklib cracklib-check">
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| 244 | <primary sortas="b-cracklib-check">cracklib-check</primary>
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| 245 | </indexterm>
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| 246 | </listitem>
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| 247 | </varlistentry>
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| 248 |
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[c2de366] | 249 | <varlistentry id="cracklib-format">
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| 250 | <term><command>cracklib-format</command></term>
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| 251 | <listitem>
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| 252 | <para>is used to format text files (lowercases all words,
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| 253 | removes controle characters and sorts the lists).</para>
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| 254 | <indexterm zone="cracklib cracklib-format">
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| 255 | <primary sortas="b-cracklib-format">cracklib-format</primary>
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| 256 | </indexterm>
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| 257 | </listitem>
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| 258 | </varlistentry>
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| 259 |
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| 260 | <varlistentry id="cracklib-packer">
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| 261 | <term><command>cracklib-packer</command></term>
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| 262 | <listitem>
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| 263 | <para>creates a database with words read from standard input.</para>
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| 264 | <indexterm zone="cracklib cracklib-packer">
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| 265 | <primary sortas="b-cracklib-packer">cracklib-packer</primary>
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| 266 | </indexterm>
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| 267 | </listitem>
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| 268 | </varlistentry>
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| 269 |
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| 270 | <varlistentry id="cracklib-unpacker">
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| 271 | <term><command>cracklib-unpacker</command></term>
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| 272 | <listitem>
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| 273 | <para>displays on standard output the database specified.</para>
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| 274 | <indexterm zone="cracklib cracklib-packer">
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| 275 | <primary sortas="b-cracklib-packer">cracklib-packer</primary>
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| 276 | </indexterm>
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| 277 | </listitem>
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| 278 | </varlistentry>
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| 279 |
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[8b1b2dc7] | 280 | <varlistentry id="create-cracklib-dict">
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[0170790e] | 281 | <term><command>create-cracklib-dict</command></term>
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[8b1b2dc7] | 282 | <listitem>
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| 283 | <para>is used to create the <application>CrackLib</application>
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| 284 | dictionary from the given word list(s).</para>
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| 285 | <indexterm zone="cracklib create-cracklib-dict">
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| 286 | <primary sortas="b-create-cracklib-dict">create-cracklib-dict</primary>
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| 287 | </indexterm>
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| 288 | </listitem>
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| 289 | </varlistentry>
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| 290 |
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[9623b6e8] | 291 | <varlistentry id="libcrack">
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[8f1699f2] | 292 | <term><filename class="libraryfile">libcrack.so</filename></term>
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[9623b6e8] | 293 | <listitem>
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[8b1b2dc7] | 294 | <para>provides a fast dictionary lookup method for strong
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[9623b6e8] | 295 | password enforcement.</para>
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| 296 | <indexterm zone="cracklib libcrack">
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[d456f78c] | 297 | <primary sortas="c-libcrack">libcrack.so</primary>
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[9623b6e8] | 298 | </indexterm>
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| 299 | </listitem>
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| 300 | </varlistentry>
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| 301 |
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| 302 | </variablelist>
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| 303 |
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| 304 | </sect2>
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[fa48bf3] | 305 |
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| 306 | </sect1>
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