[b4b71892] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[ff769b8c] | 2 | <!DOCTYPE sect1 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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[b4b71892] | 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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| 6 |
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[8b1b2dc7] | 7 | <!ENTITY cracklib-download-http "http://prdownloads.sourceforge.net/cracklib/cracklib-&cracklib-version;.tar.gz">
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| 8 | <!ENTITY cracklib-download-ftp " ">
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| 9 | <!ENTITY cracklib-http-md5sum "13f82f75b892cbd0ba7cb9069e307006">
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| 10 | <!ENTITY cracklib-size "480 KB">
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| 11 | <!ENTITY cracklib-buildsize "27.6 MB">
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| 12 | <!ENTITY cracklib-time "0.1 SBU">
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| 13 | <!ENTITY crackdict-download "http://prdownloads.sourceforge.net/cracklib/cracklib-words.gz">
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| 14 | <!ENTITY crackdict-size "4.4 MB">
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| 15 | <!ENTITY crackdict-md5sum "d18e670e5df560a8745e1b4dede8f84f">
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[b4b71892] | 16 | ]>
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| 17 |
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[8b1b2dc7] | 18 | <sect1 id="cracklib" xreflabel="CrackLib-&cracklib-version;">
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[9623b6e8] | 19 | <?dbhtml filename="cracklib.html"?>
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| 20 |
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| 21 | <sect1info>
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| 22 | <othername>$LastChangedBy$</othername>
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| 23 | <date>$Date$</date>
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| 24 | </sect1info>
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| 25 |
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[8b1b2dc7] | 26 | <title>CrackLib-&cracklib-version;</title>
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[9623b6e8] | 27 |
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| 28 | <indexterm zone="cracklib">
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[8b1b2dc7] | 29 | <primary sortas="a-CrackLib">CrackLib</primary>
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[9623b6e8] | 30 | </indexterm>
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| 31 |
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| 32 | <sect2 role="package">
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[8b1b2dc7] | 33 | <title>Introduction to CrackLib</title>
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[9623b6e8] | 34 |
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[8b1b2dc7] | 35 | <para>The <application>CrackLib</application> package contains a
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[0afcfa88] | 36 | library used to enforce strong passwords by comparing user selected
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[8b1b2dc7] | 37 | passwords to words in chosen word lists.</para>
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[9623b6e8] | 38 |
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| 39 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 40 | <itemizedlist spacing="compact">
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| 41 | <listitem>
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| 42 | <para>Download (HTTP): <ulink url="&cracklib-download-http;"/></para>
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| 43 | </listitem>
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| 44 | <listitem>
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| 45 | <para>Download (FTP): <ulink url="&cracklib-download-ftp;"/></para>
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| 46 | </listitem>
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| 47 | <listitem>
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[8b1b2dc7] | 48 | <para>Download MD5 sum: &cracklib-http-md5sum;</para>
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[9623b6e8] | 49 | </listitem>
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| 50 | <listitem>
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| 51 | <para>Download size: &cracklib-size;</para>
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| 52 | </listitem>
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| 53 | <listitem>
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| 54 | <para>Estimated disk space required: &cracklib-buildsize;</para>
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| 55 | </listitem>
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| 56 | <listitem>
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| 57 | <para>Estimated build time: &cracklib-time;</para>
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| 58 | </listitem>
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| 59 | </itemizedlist>
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| 60 |
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| 61 | <bridgehead renderas="sect3">Additional Downloads</bridgehead>
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| 62 | <itemizedlist spacing='compact'>
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| 63 | <listitem>
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[62494cc] | 64 | <para>Recommended word list for English-speaking countries (size:
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[22861b3] | 65 | &crackdict-size;; md5sum: &crackdict-md5sum;):
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| 66 | <ulink url="&crackdict-download;"/></para>
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| 67 | </listitem>
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[9623b6e8] | 68 | <listitem>
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[8b1b2dc7] | 69 | <para>Required patch to create a library used with the Heimdal
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| 70 | Kerberos 5 package: <ulink
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| 71 | url="&patch-root;/cracklib-&cracklib-version;-heimdal-1.patch"/></para>
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[9623b6e8] | 72 | </listitem>
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| 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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| 100 | </sect2>
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| 101 |
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| 102 | <sect2 role="installation">
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[8b1b2dc7] | 103 | <title>Installation of CrackLib</title>
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[4f65b2f] | 104 |
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[8b1b2dc7] | 105 | <para>If desired, apply the <application>Heimdal</application> patch
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| 106 | (note that with this patch the original library is not affected; this patch
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| 107 | only creates an additional library used by the
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| 108 | <application>Heimdal</application> password-checking routines):</para>
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[b4b71892] | 109 |
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[8b1b2dc7] | 110 | <screen><userinput>patch -Np1 -i ../cracklib-&cracklib-version;-heimdal-1.patch</userinput></screen>
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[b4b71892] | 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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[8b1b2dc7] | 115 | <screen><userinput>./configure --prefix=/usr --datadir=/lib &&
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| 116 | make</userinput></screen>
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[b4b71892] | 117 |
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[8b1b2dc7] | 118 | <para>Now, as the <systemitem class="username">root</systemitem> user:</para>
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[9623b6e8] | 119 |
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| 120 | <screen role="root"><userinput>make install &&
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[8b1b2dc7] | 121 | mv -v /usr/lib/libcrack.so.2* /lib &&
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[22861b3] | 122 | ln -v -sf ../../lib/libcrack.so.2.8.0 /usr/lib/libcrack.so</userinput></screen>
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| 123 |
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| 124 | <para>The following commands can be used to install the recommended word
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| 125 | list. Other word lists (text based, one word per line) can also be used by
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| 126 | simply installing them into
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| 127 | <filename class='directory'>/usr/share/dict</filename>.</para>
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| 128 |
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| 129 | <screen role="root"><userinput>install -v -m644 -D ../cracklib-words.gz \
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[8b1b2dc7] | 130 | /usr/share/dict/cracklib-words.gz &&
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| 131 | gunzip -v /usr/share/dict/cracklib-words.gz &&
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| 132 | ln -v -s cracklib-words /usr/share/dict/words &&
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| 133 | echo $(hostname) >>/usr/share/dict/cracklib-extra-words &&
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| 134 | create-cracklib-dict /usr/share/dict/cracklib-words \
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| 135 | /usr/share/dict/cracklib-extra-words</userinput></screen>
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| 136 |
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| 137 | <para>If desired, check the proper operation of the library as an
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| 138 | unprivileged user using the tests included with the package:</para>
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| 139 |
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| 140 | <screen><userinput>make test</userinput></screen>
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[9623b6e8] | 141 |
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| 142 | </sect2>
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| 143 |
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| 144 | <sect2 role="commands">
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| 145 | <title>Command Explanations</title>
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| 146 |
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[8b1b2dc7] | 147 | <para><parameter>--datadir=/lib</parameter>: This parameter forces the
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| 148 | installation of the <application>CrackLib</application> dictionary to the
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| 149 | <filename class='directory'>/lib</filename> hierarchy.</para>
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| 150 |
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| 151 | <para><command>mv -v /usr/lib/libcrack.so.2* /lib</command> and
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| 152 | <command>ln -v -sf ../../lib/libcrack.so.2.8.0 ...</command>: These two
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| 153 | commands move the <filename class='libraryfile'>libcrack.so.2.8.0</filename>
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| 154 | library and associated symlink from
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| 155 | <filename class='directory'>/usr/lib</filename> to
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| 156 | <filename class='directory'>/lib</filename>, then recreates the
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[b26339be] | 157 | <filename class='symlink'>/usr/lib/libcrack.so</filename> symlink pointing
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[8b1b2dc7] | 158 | to the relocated file.</para>
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| 159 |
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| 160 | <para><command>install -v -m644 -D ...</command>: This command creates the
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| 161 | <filename class='directory'>/usr/share/dict</filename> directory (if it
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| 162 | doesn't already exist) and installs the compressed word list there.</para>
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| 163 |
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| 164 | <para><command>ln -v -s cracklib-words /usr/share/dict/words</command>: The
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| 165 | word list is linked to <filename>/usr/share/dict/words</filename> as
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| 166 | historically, <filename>words</filename> is the primary word list in the
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| 167 | <filename class="directory">/usr/share/dict</filename> directory. Omit this
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| 168 | command if you already have a <filename>/usr/share/dict/words</filename>
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| 169 | file installed on your system.</para>
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| 170 |
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| 171 | <para><command>echo $(hostname) >>...</command>: The value of
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| 172 | <command>hostname</command> is echoed to a file called
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| 173 | <filename>cracklib-extra-words</filename>. This extra file is intended to be
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| 174 | a site specific list which includes easy to guess passwords such as company
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| 175 | or department names, user's names, product names, computer names, domain
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| 176 | names, etc.</para>
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| 177 |
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| 178 | <para><command>create-cracklib-dict ...</command>: This command creates the
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[22861b3] | 179 | <application>CrackLib</application> dictionary from the word lists. Modify
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| 180 | the command to add any additional word lists you have installed.</para>
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[9623b6e8] | 181 |
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| 182 | </sect2>
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| 183 |
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| 184 | <sect2 role="content">
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| 185 | <title>Contents</title>
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| 186 |
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| 187 | <segmentedlist>
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| 188 | <segtitle>Installed Programs</segtitle>
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| 189 | <segtitle>Installed Libraries</segtitle>
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[d80152af] | 190 | <segtitle>Installed Directories</segtitle>
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[9623b6e8] | 191 |
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| 192 | <seglistitem>
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[8b1b2dc7] | 193 | <seg>cracklib-check, cracklib-format, cracklib-packer,
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| 194 | cracklib-unpacker and create-cracklib-dict</seg>
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| 195 | <seg>libcrack.[so,a] and optionally, libcrack_heimdal.[so,a]</seg>
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| 196 | <seg>/lib/cracklib and /usr/share/dict</seg>
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[9623b6e8] | 197 | </seglistitem>
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| 198 | </segmentedlist>
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| 199 |
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| 200 | <variablelist>
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| 201 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 202 | <?dbfo list-presentation="list"?>
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| 203 | <?dbhtml list-presentation="table"?>
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| 204 |
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[8b1b2dc7] | 205 | <varlistentry id="create-cracklib-dict">
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| 206 | <term><filename>create-cracklib-dict</filename></term>
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| 207 | <listitem>
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| 208 | <para>is used to create the <application>CrackLib</application>
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| 209 | dictionary from the given word list(s).</para>
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| 210 | <indexterm zone="cracklib create-cracklib-dict">
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| 211 | <primary sortas="b-create-cracklib-dict">create-cracklib-dict</primary>
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| 212 | </indexterm>
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| 213 | </listitem>
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| 214 | </varlistentry>
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| 215 |
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[9623b6e8] | 216 | <varlistentry id="libcrack">
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[8b1b2dc7] | 217 | <term><filename class='libraryfile'>libcrack.[so,a]</filename></term>
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[9623b6e8] | 218 | <listitem>
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[8b1b2dc7] | 219 | <para>provides a fast dictionary lookup method for strong
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[9623b6e8] | 220 | password enforcement.</para>
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| 221 | <indexterm zone="cracklib libcrack">
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[8b1b2dc7] | 222 | <primary sortas="c-libcrack">libcrack.[so,a]</primary>
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[9623b6e8] | 223 | </indexterm>
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| 224 | </listitem>
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| 225 | </varlistentry>
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| 226 |
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| 227 | </variablelist>
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| 228 |
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| 229 | </sect2>
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[fa48bf3] | 230 |
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| 231 | </sect1>
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