[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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[17fb537e] | 6 |
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| 7 | <!ENTITY shadow-download-http " ">
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[349b53dd] | 8 | <!ENTITY shadow-download-ftp "ftp://ftp.pld.org.pl/software/shadow/old/shadow-&shadow-version;.tar.bz2">
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| 9 | <!ENTITY shadow-md5sum "66e3a3a60ea6b021a7babff311b07607">
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| 10 | <!ENTITY shadow-size "1.1 MB">
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| 11 | <!ENTITY shadow-buildsize "13 MB">
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| 12 | <!ENTITY shadow-time "0.3 SBU">
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[b4b71892] | 13 | ]>
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| 14 |
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[17fb537e] | 15 | <sect1 id="shadow" xreflabel="Shadow-&shadow-version;">
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[322f172] | 16 | <?dbhtml filename="shadow.html"?>
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| 17 |
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| 18 | <sect1info>
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| 19 | <othername>$LastChangedBy$</othername>
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| 20 | <date>$Date$</date>
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| 21 | </sect1info>
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| 22 |
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| 23 | <title>Shadow-&shadow-version;</title>
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| 24 |
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| 25 | <indexterm zone="shadow">
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| 26 | <primary sortas="a-Shadow">Shadow</primary>
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| 27 | </indexterm>
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| 28 |
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| 29 | <sect2 role="package">
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| 30 | <title>Introduction to Shadow</title>
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| 31 |
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| 32 | <para><application>Shadow</application> was indeed installed in LFS and
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| 33 | there is no reason to reinstall it unless you installed
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| 34 | <application>Linux-PAM</application>. If you did, this will allow programs
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| 35 | like <command>login</command> and <command>su</command> to utilize PAM.</para>
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| 36 |
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| 37 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 38 | <itemizedlist spacing="compact">
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| 39 | <listitem>
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| 40 | <para>Download (HTTP): <ulink url="&shadow-download-http;"/></para>
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| 41 | </listitem>
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| 42 | <listitem>
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| 43 | <para>Download (FTP): <ulink url="&shadow-download-ftp;"/></para>
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| 44 | </listitem>
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| 45 | <listitem>
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| 46 | <para>Download MD5 sum: &shadow-md5sum;</para>
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| 47 | </listitem>
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| 48 | <listitem>
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| 49 | <para>Download size: &shadow-size;</para>
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| 50 | </listitem>
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| 51 | <listitem>
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| 52 | <para>Estimated disk space required: &shadow-buildsize;</para>
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| 53 | </listitem>
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| 54 | <listitem>
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| 55 | <para>Estimated build time: &shadow-time;</para>
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| 56 | </listitem>
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| 57 | </itemizedlist>
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| 58 |
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| 59 | <bridgehead renderas="sect3">Additional Downloads</bridgehead>
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| 60 | <itemizedlist spacing='compact'>
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| 61 | <listitem>
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[349b53dd] | 62 | <para>Patch to fix several invalid warning messages when used with
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| 63 | <application>Linux_PAM</application>: <ulink
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| 64 | url="&patch-root;/shadow-&shadow-version;-Linux_PAM_fixes-1.patch"/></para>
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[322f172] | 65 | </listitem>
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| 66 | </itemizedlist>
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| 67 |
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| 68 | <bridgehead renderas="sect3">Shadow Dependencies</bridgehead>
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| 69 |
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| 70 | <bridgehead renderas="sect4">Required</bridgehead>
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| 71 | <para><xref linkend="Linux_PAM"/></para>
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| 72 |
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| 73 | </sect2>
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| 74 |
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| 75 | <sect2 role="installation">
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| 76 | <title>Installation of Shadow</title>
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| 77 |
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| 78 | <para>Reinstall <application>Shadow</application> by running the following
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| 79 | commands:</para>
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| 80 |
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[349b53dd] | 81 | <screen><userinput>patch -Np1 -i ../shadow-&shadow-version;-Linux_PAM_fixes-1.patch &&
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[c53fc5f6] | 82 | ./configure --libdir=/lib --enable-shared \
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[4fcf20a5] | 83 | --with-libpam --without-libcrack &&
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| 84 | sed -i 's/groups$(EXEEXT) //' src/Makefile &&
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| 85 | sed -i '/groups/d' man/Makefile &&
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[322f172] | 86 | make</userinput></screen>
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[17fb537e] | 87 |
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[322f172] | 88 | <para>Now, as the <systemitem class="username">root</systemitem> user:</para>
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[17fb537e] | 89 |
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[322f172] | 90 | <screen role="root"><userinput>make install &&
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[4fcf20a5] | 91 | mv -v /usr/bin/passwd /bin &&
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| 92 | mv -v /lib/libshadow.*a /usr/lib &&
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| 93 | rm -v /lib/libshadow.so &&
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[322f172] | 94 | ln -v -sf ../../lib/libshadow.so.0 /usr/lib/libshadow.so</userinput></screen>
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[b4b71892] | 95 |
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[322f172] | 96 | </sect2>
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[b4b71892] | 97 |
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[322f172] | 98 | <sect2 role="commands">
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| 99 | <title>Command Explanations</title>
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[b4b71892] | 100 |
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[322f172] | 101 | <para><parameter>--without-libcrack</parameter>: This switch tells
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| 102 | <application>Shadow</application> not to use
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| 103 | <filename class='libraryfile'>libcrack</filename>. This is desired as
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| 104 | <application>Linux-PAM</application> already contains
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| 105 | <filename class='libraryfile'>libcrack</filename>.</para>
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[b4b71892] | 106 |
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[322f172] | 107 | <para><command>sed -i ...</command>: These commands are used to suppress
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| 108 | the installation of the <command>groups</command> program as the version
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| 109 | from the <application>Coreutils</application> package installed during
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| 110 | LFS is preferred.</para>
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[39975e9] | 111 |
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[322f172] | 112 | </sect2>
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[b4b71892] | 113 |
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[322f172] | 114 | <sect2 role="configuration">
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| 115 | <title>Configuring Linux-PAM to Work with Shadow</title>
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[b4b71892] | 116 |
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[322f172] | 117 | <sect3 id="pam.d">
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| 118 | <title>Config Files</title>
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[b4b71892] | 119 |
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[322f172] | 120 | <para><filename>/etc/pam.d/*</filename>, or alternatively,
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| 121 | <filename>/etc/pam.conf</filename></para>
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[b4b71892] | 122 |
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[322f172] | 123 | <indexterm zone="shadow pam.d">
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| 124 | <primary sortas="e-etc-pam.d">/etc/pam.d/*</primary>
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| 125 | </indexterm>
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[2197589] | 126 |
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[322f172] | 127 | <indexterm zone="shadow pam.d">
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| 128 | <primary sortas="e-etc-pam.conf">/etc/pam.conf</primary>
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| 129 | </indexterm>
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[4fcf20a5] | 130 |
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[322f172] | 131 | </sect3>
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| 132 |
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| 133 | <sect3>
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| 134 | <title>Configuration Information</title>
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| 135 |
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| 136 | <para>Add the following <application>Linux-PAM</application> configuration
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| 137 | files to <filename class="directory">/etc/pam.d/</filename> (or add them
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| 138 | to <filename>/etc/pam.conf</filename> with the additional field for
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| 139 | the program).</para>
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| 140 |
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| 141 | <sect4>
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[974951c] | 142 | <title>'login' (with CrackLib)</title>
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[322f172] | 143 |
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| 144 | <screen role="root"><userinput>cat > /etc/pam.d/login << "EOF"
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| 145 | <literal># Begin /etc/pam.d/login
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[4fcf20a5] | 146 |
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| 147 | auth requisite pam_securetty.so
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| 148 | auth requisite pam_nologin.so
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| 149 | auth required pam_env.so
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| 150 | auth required pam_unix.so
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| 151 | account required pam_access.so
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| 152 | account required pam_unix.so
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| 153 | session required pam_motd.so
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| 154 | session required pam_limits.so
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| 155 | session optional pam_mail.so dir=/var/mail standard
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| 156 | session optional pam_lastlog.so
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| 157 | session required pam_unix.so
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| 158 | password required pam_cracklib.so retry=3 difok=8 minlen=5 \
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| 159 | dcredit=3 ocredit=3 \
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| 160 | ucredit=2 lcredit=2
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| 161 | password required pam_unix.so md5 shadow use_authtok
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| 162 |
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[322f172] | 163 | # End /etc/pam.d/login</literal>
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| 164 | EOF</userinput></screen>
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| 165 |
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| 166 | </sect4>
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[4fcf20a5] | 167 |
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[322f172] | 168 | <sect4>
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[974951c] | 169 | <title>'login' (without CrackLib)</title>
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[4fcf20a5] | 170 |
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[322f172] | 171 | <screen role="root"><userinput>cat > /etc/pam.d/login << "EOF"
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| 172 | <literal># Begin /etc/pam.d/login
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[b4b71892] | 173 |
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| 174 | auth requisite pam_securetty.so
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| 175 | auth requisite pam_nologin.so
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| 176 | auth required pam_env.so
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| 177 | auth required pam_unix.so
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| 178 | account required pam_access.so
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| 179 | account required pam_unix.so
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| 180 | session required pam_motd.so
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| 181 | session required pam_limits.so
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[4fcf20a5] | 182 | session optional pam_mail.so dir=/var/mail standard
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[b4b71892] | 183 | session optional pam_lastlog.so
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| 184 | session required pam_unix.so
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[4fcf20a5] | 185 | password required pam_unix.so md5 shadow
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[b4b71892] | 186 |
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[322f172] | 187 | # End /etc/pam.d/login</literal>
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| 188 | EOF</userinput></screen>
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[4fcf20a5] | 189 |
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[322f172] | 190 | </sect4>
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[4fcf20a5] | 191 |
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[322f172] | 192 | <sect4>
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[974951c] | 193 | <title>'passwd' (with CrackLib)</title>
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[322f172] | 194 |
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| 195 | <screen role="root"><userinput>cat > /etc/pam.d/passwd << "EOF"
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| 196 | <literal># Begin /etc/pam.d/passwd
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[b4b71892] | 197 |
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[4fcf20a5] | 198 | password required pam_cracklib.so retry=3 difok=8 minlen=5 \
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| 199 | dcredit=3 ocredit=3 \
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| 200 | ucredit=2 lcredit=2
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| 201 | password required pam_unix.so md5 shadow use_authtok
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[b4b71892] | 202 |
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[322f172] | 203 | # End /etc/pam.d/passwd</literal>
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| 204 | EOF</userinput></screen>
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| 205 |
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| 206 | </sect4>
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[b4b71892] | 207 |
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[322f172] | 208 | <sect4>
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[974951c] | 209 | <title>'passwd' (without CrackLib)</title>
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[4fcf20a5] | 210 |
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[322f172] | 211 | <screen role="root"><userinput>cat > /etc/pam.d/passwd << "EOF"
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| 212 | <literal># Begin /etc/pam.d/passwd
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[4fcf20a5] | 213 |
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| 214 | password required pam_unix.so md5 shadow
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[b4b71892] | 215 |
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[322f172] | 216 | # End /etc/pam.d/passwd</literal>
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| 217 | EOF</userinput></screen>
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| 218 |
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| 219 | </sect4>
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[4fcf20a5] | 220 |
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[322f172] | 221 | <sect4>
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| 222 | <title>'su'</title>
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[4fcf20a5] | 223 |
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[322f172] | 224 | <screen role="root"><userinput>cat > /etc/pam.d/su << "EOF"
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| 225 | <literal># Begin /etc/pam.d/su
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[b4b71892] | 226 |
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| 227 | auth sufficient pam_rootok.so
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| 228 | auth required pam_unix.so
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| 229 | account required pam_unix.so
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[4fcf20a5] | 230 | session optional pam_mail.so dir=/var/mail standard
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[b4b71892] | 231 | session required pam_unix.so
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| 232 |
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[322f172] | 233 | # End /etc/pam.d/su</literal>
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| 234 | EOF</userinput></screen>
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[b4b71892] | 235 |
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[322f172] | 236 | </sect4>
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[b4b71892] | 237 |
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[322f172] | 238 | <sect4>
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| 239 | <title>'chage'</title>
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| 240 |
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| 241 | <screen role="root"><userinput>cat > /etc/pam.d/chage << "EOF"
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| 242 | <literal># Begin /etc/pam.d/chage
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[b4b71892] | 243 |
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| 244 | auth sufficient pam_rootok.so
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| 245 | auth required pam_unix.so
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| 246 | account required pam_unix.so
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| 247 | session required pam_unix.so
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| 248 | password required pam_permit.so
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| 249 |
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[322f172] | 250 | # End /etc/pam.d/chage</literal>
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| 251 | EOF</userinput></screen>
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| 252 |
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| 253 | </sect4>
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[b4b71892] | 254 |
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[322f172] | 255 | <sect4>
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| 256 | <title>'chpasswd', 'newusers', 'groupadd', 'groupdel',
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| 257 | 'groupmod', 'useradd', 'userdel', and 'usermod'</title>
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[39975e9] | 258 |
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[322f172] | 259 | <screen role="root"><userinput>for PROGRAM in chpasswd newusers groupadd groupdel \
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[4fcf20a5] | 260 | groupmod useradd userdel usermod
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| 261 | do
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[904f31e2] | 262 | install -v -m644 /etc/pam.d/chage /etc/pam.d/$PROGRAM
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[4fcf20a5] | 263 | sed -i -e "s/chage/$PROGRAM/" /etc/pam.d/$PROGRAM
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[322f172] | 264 | done</userinput></screen>
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| 265 |
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| 266 | <warning>
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| 267 | <para>At this point, you should do a simple test to see if
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| 268 | <application>Shadow</application> is working as expected. Open
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[974951c] | 269 | another term and log in as a user, then <command>su</command> to
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| 270 | <systemitem class="username">root</systemitem>. If you do not see any
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| 271 | errors, then all is well and you should proceed with the rest of the
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[322f172] | 272 | configuration. If you did receive errors, stop now and double check
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[974951c] | 273 | the above configuration files manually. If you cannot find and
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[322f172] | 274 | fix the error, you should recompile <application>Shadow</application>
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| 275 | replacing <option>--with-libpam</option> with
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| 276 | <option>--without-libpam</option> in the above instructions. If you
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| 277 | fail to do this and the errors remain, you will be unable to log into
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| 278 | your system.</para>
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| 279 | </warning>
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| 280 |
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[349b53dd] | 281 | </sect4>
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| 282 |
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| 283 | <sect4>
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| 284 | <title>Other</title>
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| 285 |
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[322f172] | 286 | <para>Currently, <filename>/etc/pam.d/other</filename> is configured
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| 287 | to allow anyone with an account on the machine to use PAM-aware
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| 288 | programs without a configuration file for that program. After testing
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| 289 | <application>Linux-PAM</application> for proper configuration, install
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| 290 | a more restrictive <filename>other</filename> file so that
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| 291 | program-specific configuration files are required:</para>
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| 292 |
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| 293 | <screen role="root"><userinput>cat > /etc/pam.d/other << "EOF"
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| 294 | <literal># Begin /etc/pam.d/other
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[b4b71892] | 295 |
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| 296 | auth required pam_deny.so
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| 297 | auth required pam_warn.so
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| 298 | account required pam_deny.so
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| 299 | session required pam_deny.so
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| 300 | password required pam_deny.so
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| 301 | password required pam_warn.so
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| 302 |
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[322f172] | 303 | # End /etc/pam.d/other</literal>
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| 304 | EOF</userinput></screen>
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[4fcf20a5] | 305 |
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[322f172] | 306 | </sect4>
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[4fcf20a5] | 307 |
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[322f172] | 308 | <sect4 id="pam-access">
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| 309 | <title>Configuring Login Access</title>
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[4fcf20a5] | 310 |
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[322f172] | 311 | <para>Instead of using the <filename>/etc/login.access</filename>
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| 312 | file for controlling access to the system,
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| 313 | <application>Linux-PAM</application> uses the
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| 314 | <filename class='libraryfile'>pam_access.so</filename> module along
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| 315 | with the <filename>/etc/security/access.conf</filename> file. Rename
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| 316 | the <filename>/etc/login.access</filename> file using the following
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| 317 | command:</para>
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| 318 |
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| 319 | <indexterm zone="shadow pam-access">
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| 320 | <primary sortas="e-etc-security-access.conf">/etc/security/access.conf</primary>
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| 321 | </indexterm>
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| 322 |
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| 323 | <screen role="root"><userinput>if [ -f /etc/login.access ]; then
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[4fcf20a5] | 324 | mv -v /etc/login.access /etc/login.access.NOUSE
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[322f172] | 325 | fi</userinput></screen>
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| 326 |
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| 327 | </sect4>
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| 328 |
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| 329 | <sect4 id="pam-limits">
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| 330 | <title>Configuring Resource Limits</title>
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| 331 |
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| 332 | <para>Instead of using the <filename>/etc/limits</filename> file
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| 333 | for limiting usage of system resources,
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| 334 | <application>Linux-PAM</application> uses the
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| 335 | <filename class='libraryfile'>pam_limits.so</filename> module along
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| 336 | with the <filename>/etc/security/limits.conf</filename> file. Rename
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| 337 | the <filename>/etc/limits</filename> file using the following
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| 338 | command:</para>
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| 339 |
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| 340 | <indexterm zone="shadow pam-limits">
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| 341 | <primary sortas="e-etc-security-limits.conf">/etc/security/limits.conf</primary>
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| 342 | </indexterm>
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| 343 |
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| 344 | <screen role="root"><userinput>if [ -f /etc/limits ]; then
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[4fcf20a5] | 345 | mv -v /etc/limits /etc/limits.NOUSE
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[322f172] | 346 | fi</userinput></screen>
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| 347 |
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| 348 | </sect4>
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[4fcf20a5] | 349 |
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[322f172] | 350 | <sect4 id="pam-login-defs">
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| 351 | <title>Configuring /etc/login.defs</title>
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[4fcf20a5] | 352 |
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[322f172] | 353 | <para>The <command>login</command> program currently performs many
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| 354 | functions which <application>Linux-PAM</application> modules should
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| 355 | now handle. The following command will comment out the appropriate
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| 356 | lines in <filename>/etc/login.defs</filename>, and stop
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| 357 | <command>login</command> from performing these functions:</para>
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[4fcf20a5] | 358 |
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[322f172] | 359 | <indexterm zone="shadow pam-login-defs">
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| 360 | <primary sortas="e-etc-login.defs">/etc/login.defs</primary>
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| 361 | </indexterm>
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| 362 |
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| 363 | <screen role="root"><userinput>for FUNCTION in LASTLOG_ENAB MAIL_CHECK_ENAB \
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[4fcf20a5] | 364 | PORTTIME_CHECKS_ENAB CONSOLE \
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| 365 | MOTD_FILE NOLOGINS_FILE PASS_MIN_LEN \
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| 366 | SU_WHEEL_ONLY MD5_CRYPT_ENAB \
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[349b53dd] | 367 | CONSOLE_GROUPS ENVIRON_FILE \
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| 368 | ULIMIT ENV_TZ ENV_HZ ENV_SUPATH \
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[4c700d3f] | 369 | ENV_PATH QMAIL_DIR MAIL_DIR MAIL_FILE \
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| 370 | CHFN_AUTH FAILLOG_ENAB QUOTAS_ENAB FTMP_FILE
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[4fcf20a5] | 371 | do
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| 372 | sed -i -e "s/^$FUNCTION/# &/" /etc/login.defs
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[322f172] | 373 | done</userinput></screen>
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[4fcf20a5] | 374 |
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[974951c] | 375 | <para>If you have <application>CrackLib</application> installed,
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[322f172] | 376 | also comment out four more lines using the following command:</para>
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[4fcf20a5] | 377 |
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[322f172] | 378 | <screen role="root"><userinput>for FUNCTION in OBSCURE_CHECKS_ENAB CRACKLIB_DICTPATH \
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[4fcf20a5] | 379 | PASS_CHANGE_TRIES PASS_ALWAYS_WARN
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| 380 | do
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| 381 | sed -i -e "s/^$FUNCTION/# &/" /etc/login.defs
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[322f172] | 382 | done</userinput></screen>
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| 383 |
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| 384 | </sect4>
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[b4b71892] | 385 |
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[322f172] | 386 | </sect3>
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[b4b71892] | 387 |
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[322f172] | 388 | </sect2>
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[f45b1953] | 389 |
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[322f172] | 390 | <sect2 role="content">
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| 391 | <title>Contents</title>
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[17fb537e] | 392 |
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[322f172] | 393 | <para>A list of the installed files, along with their short descriptions
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| 394 | can be found at
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| 395 | <ulink url="&lfs-root;/chapter06/shadow.html#contents-shadow"/>.</para>
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[17fb537e] | 396 |
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[322f172] | 397 | </sect2>
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[17fb537e] | 398 |
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[f45b1953] | 399 | </sect1>
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