[281a21f] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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| 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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| 6 |
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| 7 | <!ENTITY util-linux-download-http "https://www.kernel.org/pub/linux/utils/util-linux/v&util-linux-minor;/util-linux-&util-linux-version;.tar.xz">
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| 8 | <!ENTITY util-linux-download-ftp " ">
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| 9 | <!ENTITY util-linux-md5sum "d659bf7cd417d93dc609872f6334b019">
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| 10 | <!ENTITY util-linux-size "5.4 MB">
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| 11 | <!ENTITY util-linux-buildsize "60 MB">
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| 12 | <!ENTITY util-linux-time "less than 0.1 SBU">
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| 13 | ]>
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| 14 |
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| 15 | <sect1 id="util-linux" xreflabel="Util-linux-&util-linux-version;">
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| 16 | <?dbhtml filename="util-linux.html"?>
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| 17 |
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| 18 |
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| 19 | <title>Util-linux-&util-linux-version;</title>
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| 20 |
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| 21 | <indexterm zone="util-linux">
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| 22 | <primary sortas="a-Util-linux">Util-linux</primary>
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| 23 | </indexterm>
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| 24 |
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| 25 | <sect2 role="package">
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| 26 | <title>Introduction to Util-linux</title>
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| 27 |
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| 28 | <para>
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| 29 | <application>Util-linux</application> was indeed installed in LFS and
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| 30 | there is no reason to reinstall it unless you installed
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| 31 | <application>Linux-PAM</application> after your LFS system was completed.
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| 32 | If you have installed <application>Linux-PAM</application>,
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| 33 | it's possible to build <command>su</command> and
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| 34 | <command>runuser</command> from <application>Util-linux</application>.
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[8ddd8400] | 35 | The <application>Shadow</application> maintainers recommend using
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| 36 | <command>su</command> from <application>Util-linux</application>
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| 37 | instead of the version from <application>Shadow</application>.
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[281a21f] | 38 | </para>
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| 39 |
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| 40 | &lfs110a_checked;
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| 41 |
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| 42 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 43 | <itemizedlist spacing="compact">
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| 44 | <listitem>
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| 45 | <para>
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| 46 | Download (HTTP): <ulink url="&util-linux-download-http;"/>
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| 47 | </para>
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| 48 | </listitem>
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| 49 | <listitem>
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| 50 | <para>
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| 51 | Download (FTP): <ulink url="&util-linux-download-ftp;"/>
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| 52 | </para>
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| 53 | </listitem>
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| 54 | <listitem>
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| 55 | <para>
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| 56 | Download MD5 sum: &util-linux-md5sum;
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| 57 | </para>
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| 58 | </listitem>
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| 59 | <listitem>
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| 60 | <para>
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| 61 | Download size: &util-linux-size;
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| 62 | </para>
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| 63 | </listitem>
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| 64 | <listitem>
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| 65 | <para>
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| 66 | Estimated disk space required: &util-linux-buildsize;
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| 67 | </para>
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| 68 | </listitem>
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| 69 | <listitem>
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| 70 | <para>
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| 71 | Estimated build time: &util-linux-time;
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| 72 | </para>
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| 73 | </listitem>
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| 74 | </itemizedlist>
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| 75 |
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| 76 | <bridgehead renderas="sect3">Util-linux Dependencies</bridgehead>
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| 77 |
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| 78 | <bridgehead renderas="sect4">Required</bridgehead>
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| 79 | <para role="required">
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| 80 | <xref linkend="linux-pam"/>
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| 81 | </para>
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| 82 |
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| 83 | <para condition="html" role="usernotes">
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| 84 | User Notes: <ulink url="&blfs-wiki;/shadow"/>
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| 85 | </para>
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| 86 | </sect2>
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| 87 |
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| 88 | <sect2 role="installation">
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| 89 | <title>Installation of Util-linux</title>
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| 90 |
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| 91 | <important>
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| 92 | <para>
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| 93 | The installation commands shown below are for installations where
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| 94 | <application>Linux-PAM</application> has been installed and
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| 95 | <application>Util-linux</application> is being rebuilt to
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| 96 | support the <application>Linux-PAM</application> installation.
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| 97 | </para>
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| 98 |
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| 99 | <para>
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| 100 | If you are upgrading <application>Util-linux</application>, follow
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| 101 | the instruction for <application>Util-linux</application> in
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[bbf9029] | 102 | <ulink url='&lfs-dev;/chapter08/util-linux.html'>LFS</ulink>. If
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[281a21f] | 103 | <application>Linux-PAM</application> has been installed,
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| 104 | <command>su</command> and <command>runuser</command> will
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[8030339] | 105 | automatically be built too. You should follow
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[281a21f] | 106 | <xref linkend='pam-util-linux'/> to set up the PAM
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[8ddd8400] | 107 | configuration in this case.
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[281a21f] | 108 | </para>
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| 109 | </important>
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| 110 |
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| 111 | <para>
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| 112 | Build <command>su</command> and <command>runuser</command> from
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| 113 | <application>Util-linux</application>:
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| 114 | </para>
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| 115 |
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| 116 | <screen><userinput>./configure ADJTIME_PATH=/var/lib/hwclock/adjtime \
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| 117 | --libdir=/usr/lib \
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| 118 | --docdir=/usr/share/doc/util-linux-&util-linux-version; \
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| 119 | --disable-chfn-chsh \
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| 120 | --disable-login \
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| 121 | --disable-nologin \
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| 122 | --disable-setpriv \
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| 123 | --disable-pylibmount \
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| 124 | --disable-static \
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| 125 | --without-python \
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| 126 | runstatedir=/run &&
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| 127 | make su runuser</userinput></screen>
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| 128 |
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| 129 | <para>
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| 130 | This package does not come with a test suite.
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| 131 | </para>
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| 132 |
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| 133 | <para>
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| 134 | Now, as the <systemitem class="username">root</systemitem> user:
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| 135 | </para>
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| 136 |
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| 137 | <screen role="root"><userinput>install -vm4755 su /usr/bin/su
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| 138 | install -vm0755 runuser /usr/sbin/runuser
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| 139 | find /usr/share/man -name su.1 -delete
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[684b2a58] | 140 | install -vm0644 login-utils/{su,runuser}.1 /usr/share/man/man1</userinput></screen>
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[281a21f] | 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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| 147 | <para>
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| 148 | <command>find /usr/share/man -name su.1 -delete</command>: This
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| 149 | is used to remove the man pages for <command>su</command> installed
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| 150 | from <application>Shadow</application>.
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| 151 | <application>Shadow</application> installs man pages with multiple
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[8ddd8400] | 152 | languages. They need to be removed to prevent
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[281a21f] | 153 | <command>man su</command> from picking up a translated man page
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| 154 | instead of <filename>/usr/share/man/man1/su.1</filename>.
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| 155 | </para>
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| 156 | </sect2>
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| 157 |
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| 158 | <sect2 role="configuration">
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| 159 | <title>Configuring Linux-PAM to Work with Util-linux</title>
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| 160 |
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[8030339] | 161 | <sect3>
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[281a21f] | 162 | <title>Config Files</title>
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| 163 |
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| 164 | <para>
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| 165 | <filename>/etc/pam.d/su</filename>,
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| 166 | <filename>/etc/pam.d/su-l</filename>, and
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| 167 | <filename>/etc/pam.d/runuser</filename>
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| 168 | </para>
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| 169 |
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| 170 | <indexterm zone="util-linux pam.d">
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| 171 | <primary sortas="e-etc-pam.d-su">/etc/pam.d/su</primary>
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| 172 | </indexterm>
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| 173 |
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| 174 | <indexterm zone="util-linux pam.d">
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| 175 | <primary sortas="e-etc-pam.d-su">/etc/pam.d/su-l</primary>
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| 176 | </indexterm>
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| 177 |
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| 178 | <indexterm zone="util-linux pam.d">
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| 179 | <primary sortas="e-etc-pam.d-su">/etc/pam.d/runuser</primary>
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| 180 | </indexterm>
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| 181 | </sect3>
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| 182 |
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[8030339] | 183 | <sect3 id='pam-util-linux'>
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[281a21f] | 184 | <title>Configuring the /etc/pam.d/ Files</title>
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| 185 |
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| 186 | <para>
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| 187 | As the <systemitem class="username">root</systemitem> user, create
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| 188 | the following <application>Linux-PAM</application> configuration files
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| 189 | in the <filename class="directory">/etc/pam.d/</filename> directory
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| 190 | (or add the contents to the <filename>/etc/pam.conf</filename> file)
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| 191 | using the following commands:
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| 192 | </para>
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| 193 |
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| 194 | <sect4>
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| 195 | <title>'su' and 'su-l'</title>
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| 196 |
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| 197 | <screen role="root"><userinput>cat > /etc/pam.d/su << "EOF"
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| 198 | <literal># Begin /etc/pam.d/su
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| 199 |
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| 200 | # always allow root
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| 201 | auth sufficient pam_rootok.so
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| 202 |
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| 203 | # Allow users in the wheel group to execute su without a password
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| 204 | # disabled by default
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| 205 | #auth sufficient pam_wheel.so trust use_uid
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| 206 |
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| 207 | # include system auth settings
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| 208 | auth include system-auth
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| 209 |
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| 210 | # limit su to users in the wheel group
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| 211 | auth required pam_wheel.so use_uid
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| 212 |
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| 213 | # include system account settings
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| 214 | account include system-account
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| 215 |
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| 216 | # Set default environment variables for the service user
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| 217 | session required pam_env.so
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| 218 |
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| 219 | # include system session settings
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| 220 | session include system-session
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| 221 |
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| 222 | # End /etc/pam.d/su</literal>
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| 223 | EOF
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| 224 | ln -sv su /etc/pam.d/su-l</userinput></screen>
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| 225 |
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| 226 | </sect4>
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| 227 |
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| 228 | <sect4>
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| 229 | <title>'runuser'</title>
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| 230 |
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| 231 | <screen role="root"><userinput>cat > /etc/pam.d/runuser << "EOF"
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| 232 | <literal># Begin /etc/pam.d/runuser
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| 233 |
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| 234 | auth sufficient pam_rootok.so
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| 235 | session include system-session
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| 236 |
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| 237 | # End /etc/pam.d/runuser</literal>
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| 238 | EOF</userinput></screen>
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| 239 |
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| 240 | <warning>
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| 241 | <para>
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| 242 | At this point, you should do a simple test to see if
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| 243 | <command>su</command> is working as expected. Open
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| 244 | another terminal and log in as a user, then
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| 245 | <command>su</command> to
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| 246 | <systemitem class="username">root</systemitem>.
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| 247 | If you do not see any errors, then all is well.
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| 248 | If you did receive errors, stop now and double check the
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| 249 | above configuration files manually. One obvious reason
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| 250 | for an error is if the user is not in group <systemitem
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| 251 | class="groupname">wheel</systemitem>. You may want to run
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| 252 | (as <systemitem class="username">root</systemitem>):
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| 253 | <command>usermod -a -G wheel
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| 254 | <replaceable><user></replaceable></command>.
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| 255 | Any other error is the sign of an error in the above
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| 256 | procedure. You can also run the test suite from the
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| 257 | <application>Linux-PAM</application> package to assist you
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[8ddd8400] | 258 | in determining the cause of the problem.
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[281a21f] | 259 | </para>
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| 260 | </warning>
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| 261 | </sect4>
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| 262 | </sect3>
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| 263 | </sect2>
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| 264 |
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| 265 | <sect2 role="content">
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| 266 | <title>Contents</title>
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| 267 |
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| 268 | <para>
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| 269 | Listed below are the newly installed programs along with short
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| 270 | descriptions.
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| 271 | </para>
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| 272 |
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| 273 | <segmentedlist>
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| 274 | <segtitle>Installed Programs</segtitle>
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| 275 |
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| 276 | <seglistitem>
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| 277 | <seg>
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| 278 | su and runuser
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| 279 | </seg>
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| 280 | </seglistitem>
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| 281 | </segmentedlist>
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| 282 |
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| 283 | <variablelist>
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| 284 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 285 | <?dbfo list-presentation="list"?>
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| 286 | <?dbhtml list-presentation="table"?>
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| 287 |
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| 288 | <varlistentry id="su">
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| 289 | <term><command>su</command></term>
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| 290 | <listitem>
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| 291 | <para>
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[8ddd8400] | 292 | runs a command with substitute user and group ID
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[281a21f] | 293 | </para>
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| 294 | <indexterm zone="util-linux su">
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| 295 | <primary sortas="b-su">su</primary>
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| 296 | </indexterm>
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| 297 | </listitem>
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| 298 | </varlistentry>
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| 299 |
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| 300 | <varlistentry id="runuser">
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| 301 | <term><command>runuser</command></term>
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| 302 | <listitem>
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| 303 | <para>
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[8ddd8400] | 304 | runs a command with substitute user and group ID; it's like
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[281a21f] | 305 | <command>su</command> but can only be used as
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| 306 | the <systemitem class='username'>root</systemitem> user.
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| 307 | </para>
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| 308 | <indexterm zone="util-linux runuser">
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| 309 | <primary sortas="b-util-linux-runuser">runuser</primary>
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| 310 | </indexterm>
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| 311 | </listitem>
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| 312 | </varlistentry>
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| 313 |
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| 314 | </variablelist>
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| 315 |
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| 316 | </sect2>
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| 317 |
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| 318 | </sect1>
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