mirror of
https://github.com/Zeckmathederg/glfs.git
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361 lines
12 KiB
XML
361 lines
12 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../../general.ent">
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%general-entities;
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<!ENTITY cracklib-url "https://github.com/cracklib/cracklib/releases/download">
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<!ENTITY cracklib-download-http "&cracklib-url;/v&cracklib-version;/cracklib-&cracklib-version;.tar.bz2">
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<!ENTITY cracklib-download-ftp " ">
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<!ENTITY cracklib-md5sum "a242301bad13421476db8eecbbc9536a">
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<!ENTITY cracklib-size "600 KB">
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<!ENTITY cracklib-buildsize "6.7 MB">
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<!ENTITY cracklib-time "0.1 SBU">
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<!ENTITY crackdict-download "&cracklib-url;/v&cracklib-version;/cracklib-words-&cracklib-version;.bz2">
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<!ENTITY crackdict-size "6.7 MB">
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<!ENTITY crackdict-md5sum "94e9963e4786294f7fb0f2efd7618551">
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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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<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>
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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.
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</para>
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&lfs112_checked;
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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>
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Download (HTTP): <ulink url="&cracklib-download-http;"/>
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</para>
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</listitem>
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<listitem>
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<para>
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Download (FTP): <ulink url="&cracklib-download-ftp;"/>
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</para>
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</listitem>
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<listitem>
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<para>
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Download MD5 sum: &cracklib-md5sum;
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</para>
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</listitem>
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<listitem>
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<para>
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Download size: &cracklib-size;
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</para>
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</listitem>
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<listitem>
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<para>
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Estimated disk space required: &cracklib-buildsize;
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</para>
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</listitem>
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<listitem>
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<para>
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Estimated build time: &cracklib-time;
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</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>
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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;"/>
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</para>
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</listitem>
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</itemizedlist>
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<para>
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There are additional word lists available for download, e.g., from
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<ulink url="https://wiki.skullsecurity.org/index.php/Passwords"/>.
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<application>CrackLib</application> can utilize as many, or as few word
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lists you choose to install.
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</para>
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<important>
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<para>
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Users tend to base their passwords on regular words of the spoken
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language, and crackers know that. <application>CrackLib</application>
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is 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
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list(s) for use with <application>CrackLib</application> must be an
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exhaustive list of words and word-based keystroke combinations likely
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to be chosen by users of the system as (guessable) passwords.
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</para>
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<para>
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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 lists.
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</para>
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<para>
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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.
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</para>
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</important>
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<para condition="html" role="usernotes">User Notes:
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<ulink url="&blfs-wiki;/cracklib"/>
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</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>
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Install <application>CrackLib</application> by running the following
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commands:
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</para>
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<screen><userinput>autoreconf -fiv &&
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PYTHON=python3 \
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./configure --prefix=/usr \
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--disable-static \
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--with-default-dict=/usr/lib/cracklib/pw_dict &&
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make</userinput></screen>
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<para>
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Now, as the <systemitem class="username">root</systemitem> user:
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</para>
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<screen role="root"><userinput>make install</userinput></screen>
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<para>
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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.
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</para>
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<screen role="root"><userinput>install -v -m644 -D ../cracklib-words-&cracklib-version;.bz2 \
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/usr/share/dict/cracklib-words.bz2 &&
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bunzip2 -v /usr/share/dict/cracklib-words.bz2 &&
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ln -v -sf 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 /usr/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>
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If desired, check the proper operation of the library as an
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unprivileged user by issuing the following command:
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</para>
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<screen remap="test"><userinput>make test</userinput></screen>
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<important>
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<para>
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If you are installing <application>CrackLib</application> after
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your LFS system has been completed and you have the
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<application>Shadow</application> package installed, you must
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reinstall <xref linkend="shadow"/> if you wish to provide strong
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password support on your system. If you are now going to install the
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<xref linkend="linux-pam"/> package, you may disregard this note as
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<application>Shadow</application> will be reinstalled after the
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<application>Linux-PAM</application> installation.
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</para>
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</important>
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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>
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<command>sed -i '/skipping/d' util/packer.c</command>:
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Remove a meaningless warning.
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</para>
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<para>
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<command>autoreconf -fiv</command>: The configure script shipped with
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the package is too old to get the right version string of Python
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3.10 or later. This command regenerates it with a more recent version
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of autotools, which fixes the issue.
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</para>
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<para>
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<envar>PYTHON=python3</envar>: This forces the installation of
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python bindings for Python 3, even if Python 2 is installed.
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</para>
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<!-- fixed by autoreconf
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<para>
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<envar>CPPFLAGS=-I/usr/include/python&python3-majorver;</envar>:
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This works around an issue caused by incorrect usage of Python 3
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headers.
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</para>
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-->
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<para>
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<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.
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</para>
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
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href="../../xincludes/static-libraries.xml"/>
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<para>
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<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.
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</para>
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<para>
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<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
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this command if you already have a
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<filename>/usr/share/dict/words</filename> file installed on your system.
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</para>
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<para>
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<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
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to be a site specific list which includes easy to guess passwords such
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as company or department names, user names, product names, computer
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names, domain names, etc.
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</para>
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<para>
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<command>create-cracklib-dict ...</command>: This command creates the
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<application>CrackLib</application> dictionary from the word lists.
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Modify the command to add any additional word lists you have installed.
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</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 and the _cracklib.so
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(<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="cracklib-check">
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<term><command>cracklib-check</command></term>
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<listitem>
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<para>
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is used to determine if a password is strong
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</para>
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<indexterm zone="cracklib cracklib-check">
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<primary sortas="b-cracklib-check">cracklib-check</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="cracklib-format">
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<term><command>cracklib-format</command></term>
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<listitem>
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<para>
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is used to format text files (lowercases all words,
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removes control characters and sorts the lists)
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</para>
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<indexterm zone="cracklib cracklib-format">
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<primary sortas="b-cracklib-format">cracklib-format</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="cracklib-packer">
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<term><command>cracklib-packer</command></term>
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<listitem>
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<para>
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creates a database with words read from standard input
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</para>
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<indexterm zone="cracklib cracklib-packer">
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<primary sortas="b-cracklib-packer">cracklib-packer</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="cracklib-unpacker">
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<term><command>cracklib-unpacker</command></term>
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<listitem>
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<para>
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displays on standard output the database specified
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</para>
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<indexterm zone="cracklib cracklib-packer">
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<primary sortas="b-cracklib-packer">cracklib-packer</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="create-cracklib-dict">
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<term><command>create-cracklib-dict</command></term>
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<listitem>
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<para>
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is used to create the <application>CrackLib</application>
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dictionary from the given word list(s)
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</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</filename></term>
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<listitem>
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<para>
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provides a fast dictionary lookup method for strong
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password enforcement
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</para>
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<indexterm zone="cracklib libcrack">
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<primary sortas="c-libcrack">libcrack.so</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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