mirror of
https://github.com/Zeckmathederg/glfs.git
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9084c2ebd8
git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@5383 af4574ff-66df-0310-9fd7-8a98e5e911e0
248 lines
10 KiB
XML
248 lines
10 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../../general.ent">
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%general-entities;
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<!ENTITY cracklib-download-http "http://prdownloads.sourceforge.net/cracklib/cracklib-&cracklib-version;.tar.gz">
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<!ENTITY cracklib-download-ftp " ">
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<!ENTITY cracklib-http-md5sum "3cef136fe33fc40c57f7514d9aa90c51">
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<!ENTITY cracklib-size "574 KB">
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<!ENTITY cracklib-buildsize "28.7 MB (without Python bindings)">
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<!ENTITY cracklib-time "0.1 SBU">
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<!ENTITY crackdict-download "http://prdownloads.sourceforge.net/cracklib/cracklib-words.gz">
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<!ENTITY crackdict-size "4.4 MB">
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<!ENTITY crackdict-md5sum "d18e670e5df560a8745e1b4dede8f84f">
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]>
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<sect1 id="cracklib" xreflabel="CrackLib-&cracklib-version;">
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<?dbhtml filename="cracklib.html"?>
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<sect1info>
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<othername>$LastChangedBy$</othername>
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<date>$Date$</date>
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<keywordset>
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<keyword role="package">cracklib-&cracklib-version;.tar</keyword>
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<keyword role="ftpdir">cracklib</keyword>
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</keywordset>
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</sect1info>
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<title>CrackLib-&cracklib-version;</title>
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<indexterm zone="cracklib">
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<primary sortas="a-CrackLib">CrackLib</primary>
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</indexterm>
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<sect2 role="package">
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<title>Introduction to CrackLib</title>
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<para>The <application>CrackLib</application> package contains a
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library used to enforce strong passwords by comparing user selected
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passwords to words in chosen word lists.</para>
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<bridgehead renderas="sect3">Package Information</bridgehead>
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<itemizedlist spacing="compact">
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<listitem>
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<para>Download (HTTP): <ulink url="&cracklib-download-http;"/></para>
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</listitem>
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<listitem>
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<para>Download (FTP): <ulink url="&cracklib-download-ftp;"/></para>
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</listitem>
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<listitem>
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<para>Download MD5 sum: &cracklib-http-md5sum;</para>
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</listitem>
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<listitem>
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<para>Download size: &cracklib-size;</para>
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</listitem>
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<listitem>
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<para>Estimated disk space required: &cracklib-buildsize;</para>
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</listitem>
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<listitem>
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<para>Estimated build time: &cracklib-time;</para>
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</listitem>
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</itemizedlist>
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<bridgehead renderas="sect3">Additional Downloads</bridgehead>
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<itemizedlist spacing='compact'>
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<listitem>
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<para>Recommended word list for English-speaking countries (size:
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&crackdict-size;; md5sum: &crackdict-md5sum;):
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<ulink url="&crackdict-download;"/></para>
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</listitem>
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<listitem>
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<para>Required patch to create a library used with the Heimdal
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Kerberos 5 package: <ulink
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url="&patch-root;/cracklib-&cracklib-version;-heimdal-1.patch"/></para>
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</listitem>
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</itemizedlist>
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<para>There are additional word lists available for download, e.g., from
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<ulink url="http://www.cotse.com/tools/wordlists.htm"/>.
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<application>CrackLib</application> can utilize as many, or as few word
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lists you choose to install.</para>
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<important>
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<para>Users tend to base their passwords on regular words of the spoken
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language, and crackers know that. <application>CrackLib</application> is
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intended to filter out such bad passwords at the source using a
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dictionary created from word lists. To accomplish this, the word list(s)
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for use with <application>CrackLib</application> must be an exhaustive
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list of words and word-based keystroke combinations likely to be chosen
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by users of the system as (guessable) passwords.</para>
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<para>The default word list recommended above for downloading mostly
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satisfies this role in English-speaking countries. In other situations,
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it may be necessary to download (or even create) additional word
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lists.</para>
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<para>Note that word lists suitable for spell-checking are not usable
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as <application>CrackLib</application> word lists in countries with
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non-Latin based alphabets, because of <quote>word-based keystroke
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combinations</quote> that make bad passwords.</para>
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</important>
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<bridgehead renderas="sect3">CrackLib Dependencies</bridgehead>
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<bridgehead renderas="sect4">Optional</bridgehead>
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<para role="optional"><xref linkend="python"/></para>
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</sect2>
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<sect2 role="installation">
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<title>Installation of CrackLib</title>
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<para>If desired, apply the <application>Heimdal</application> patch
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(note that with this patch the original library is not affected; this patch
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only creates an additional library used by the
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<application>Heimdal</application> password-checking routines):</para>
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<screen><userinput>patch -Np1 -i ../cracklib-&cracklib-version;-heimdal-1.patch</userinput></screen>
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<para>Install <application>CrackLib</application> by running the following
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commands:</para>
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<screen><userinput>./configure --prefix=/usr \
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--with-default-dict=/lib/cracklib/pw_dict &&
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make</userinput></screen>
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<para>Now, as the <systemitem class="username">root</systemitem> user:</para>
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<screen role="root"><userinput>make install &&
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mv -v /usr/lib/libcrack.so.2* /lib &&
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ln -v -sf ../../lib/libcrack.so.2.8.0 /usr/lib/libcrack.so</userinput></screen>
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<para>Issue the following commands as the
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<systemitem class="username">root</systemitem> user to install the
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recommended word list and create the <application>CrackLib</application>
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dictionary. Other word lists (text based, one word per line) can also be
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used by simply installing them into
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<filename class='directory'>/usr/share/dict</filename> and adding them
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to the <command>create-cracklib-dict</command> command.</para>
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<screen role="root"><userinput>install -v -m644 -D ../cracklib-words.gz \
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/usr/share/dict/cracklib-words.gz &&
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gunzip -v /usr/share/dict/cracklib-words.gz &&
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ln -v -s cracklib-words /usr/share/dict/words &&
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echo $(hostname) >>/usr/share/dict/cracklib-extra-words &&
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install -v -m755 -d /lib/cracklib &&
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create-cracklib-dict /usr/share/dict/cracklib-words \
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/usr/share/dict/cracklib-extra-words</userinput></screen>
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<para>If desired, check the proper operation of the library as an
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unprivileged user using the tests included with the package:</para>
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<screen><userinput>make test</userinput></screen>
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</sect2>
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<sect2 role="commands">
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<title>Command Explanations</title>
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<para><parameter>--with-default-dict=/lib/cracklib/pw_dict</parameter>:
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This parameter forces the installation of the
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<application>CrackLib</application> dictionary to the
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<filename class='directory'>/lib</filename> hierarchy.</para>
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<para><command>mv -v /usr/lib/libcrack.so.2* /lib</command> and
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<command>ln -v -sf ../../lib/libcrack.so.2.8.0 ...</command>: These two
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commands move the <filename class='libraryfile'>libcrack.so.2.8.0</filename>
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library and associated symlink from
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<filename class='directory'>/usr/lib</filename> to
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<filename class='directory'>/lib</filename>, then recreates the
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<filename class='symlink'>/usr/lib/libcrack.so</filename> symlink pointing
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to the relocated file.</para>
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<para><command>install -v -m644 -D ...</command>: This command creates the
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<filename class='directory'>/usr/share/dict</filename> directory (if it
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doesn't already exist) and installs the compressed word list there.</para>
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<para><command>ln -v -s cracklib-words /usr/share/dict/words</command>: The
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word list is linked to <filename>/usr/share/dict/words</filename> as
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historically, <filename>words</filename> is the primary word list in the
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<filename class="directory">/usr/share/dict</filename> directory. Omit this
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command if you already have a <filename>/usr/share/dict/words</filename>
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file installed on your system.</para>
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<para><command>echo $(hostname) >>...</command>: The value of
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<command>hostname</command> is echoed to a file called
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<filename>cracklib-extra-words</filename>. This extra file is intended to be
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a site specific list which includes easy to guess passwords such as company
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or department names, user's names, product names, computer names, domain
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names, etc.</para>
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<para><command>create-cracklib-dict ...</command>: This command creates the
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<application>CrackLib</application> dictionary from the word lists. Modify
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the command to add any additional word lists you have installed.</para>
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</sect2>
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<sect2 role="content">
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<title>Contents</title>
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<segmentedlist>
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<segtitle>Installed Programs</segtitle>
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<segtitle>Installed Libraries</segtitle>
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<segtitle>Installed Directories</segtitle>
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<seglistitem>
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<seg>cracklib-check, cracklib-format, cracklib-packer,
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cracklib-unpacker and create-cracklib-dict</seg>
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<seg>libcrack.[so,a] and optionally, libcrack_heimdal.[so,a] and
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cracklibmodule.[so,a] <application>Python</application> module</seg>
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<seg>/lib/cracklib, /usr/share/dict and /usr/share/cracklib</seg>
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</seglistitem>
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</segmentedlist>
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<variablelist>
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<bridgehead renderas="sect3">Short Descriptions</bridgehead>
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<?dbfo list-presentation="list"?>
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<?dbhtml list-presentation="table"?>
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<varlistentry id="create-cracklib-dict">
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<term><filename>create-cracklib-dict</filename></term>
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<listitem>
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<para>is used to create the <application>CrackLib</application>
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dictionary from the given word list(s).</para>
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<indexterm zone="cracklib create-cracklib-dict">
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<primary sortas="b-create-cracklib-dict">create-cracklib-dict</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="libcrack">
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<term><filename class='libraryfile'>libcrack.[so,a]</filename></term>
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<listitem>
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<para>provides a fast dictionary lookup method for strong
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password enforcement.</para>
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<indexterm zone="cracklib libcrack">
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<primary sortas="c-libcrack">libcrack.[so,a]</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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</variablelist>
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</sect2>
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</sect1>
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