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git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@3190 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
103 lines
3.6 KiB
XML
103 lines
3.6 KiB
XML
<sect1 id="ch-system-shadow" xreflabel="Shadow">
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<title>Installing Shadow-&shadow-version;</title>
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<?dbhtml filename="shadow.html" dir="chapter06"?>
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<para>The Shadow package contains programs for handling passwords in a secure
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way.</para>
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<screen>&buildtime; &shadow-time;
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&diskspace; &shadow-compsize;</screen>
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&aa-shadowpwd-down;
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&aa-shadowpwd-dep;
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<sect2><title> </title><para> </para></sect2>
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<sect2>
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<title>Installation of Shadow</title>
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<para>Shadow hard-wires the path to the <userinput>passwd</userinput> binary
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within the binary itself, but does this the wrong way. If a
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<userinput>passwd</userinput> binary is not present before installing Shadow,
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the package incorrectly assumes it is going to be located at
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<filename>/bin/passwd</filename>, but then installs it in
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<filename>/usr/bin/passwd</filename>. This will lead to errors about not finding
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<filename>/bin/passwd</filename>. To work around this bug, create a dummy
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<filename>passwd</filename> file, so that it gets hard-wired properly:</para>
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<screen><userinput>touch /usr/bin/passwd</userinput></screen>
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<para>Now prepare Shadow for compilation:</para>
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<screen><userinput>./configure --libdir=/usr/lib --enable-shared</userinput></screen>
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<para>Work around a problem that prevents Shadow's internationalization from
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working:</para>
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<screen><userinput>echo '#define HAVE_SETLOCALE 1' >> config.h</userinput></screen>
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<para>Compile the package:</para>
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<screen><userinput>make</userinput></screen>
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<para>And install it:</para>
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<screen><userinput>make install</userinput></screen>
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<para>Shadow uses two files to configure authentication settings for the
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system. Install these two config files:</para>
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<screen><userinput>cp etc/{limits,login.access} /etc</userinput></screen>
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<para>We want to change the password method to enable MD5 passwords which are
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theoretically more secure than the default "crypt" method and also allow
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password lengths greater than 8 characters. We also need to change the old
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<filename class="directory">/var/spool/mail</filename> location for user
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mailboxes to the current location at
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<filename class="directory">/var/mail</filename>. We do this by changing the
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relevant configuration file while copying it to its destination:</para>
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<screen><userinput>sed -e 's%/var/spool/mail%/var/mail%' \
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-e 's%#MD5_CRYPT_ENAB.no%MD5_CRYPT_ENAB yes%' \
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etc/login.defs.linux > /etc/login.defs</userinput></screen>
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<note><para>Be extra careful when typing all of the above. It is probably safer
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to cut-and-paste it rather than try and type it all in.</para></note>
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<para>Move some misplaced symlinks to their proper locations:</para>
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<screen><userinput>mv /bin/sg /usr/bin
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mv /bin/vigr /usr/sbin</userinput></screen>
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<para>And move Shadow's dynamic libraries to a more appropriate location:</para>
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<screen><userinput>mv /usr/lib/lib{shadow,misc}.so.0* /lib</userinput></screen>
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<para>As some packages expect to find the just-moved libraries in
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<filename>/usr/lib</filename>, create the following symlinks:</para>
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<screen><userinput>ln -sf ../../lib/libshadow.so.0 /usr/lib/libshadow.so
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ln -sf ../../lib/libmisc.so.0 /usr/lib/libmisc.so</userinput></screen>
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<para>The -D option of the <filename>useradd</filename> program requires this
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directory for it to work properly:</para>
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<screen><userinput>mkdir /etc/default</userinput></screen>
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<para>Coreutils has already installed a better <userinput>groups</userinput>
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program in <filename>/usr/bin</filename>. Remove the one installed by
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Shadow:</para>
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<screen><userinput>rm /bin/groups</userinput></screen>
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</sect2>
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&c6-cf-shadowpwd;
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&c6-cf-password;
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&aa-shadowpwd-shortdesc;
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&aa-shadowpwd-desc;
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</sect1>
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