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 | <sect1info>
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19 | <date>$Date$</date>
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20 | </sect1info>
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21 |
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22 | <title>Util-linux-&util-linux-version;</title>
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23 |
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24 | <indexterm zone="util-linux">
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25 | <primary sortas="a-Util-linux">Util-linux</primary>
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26 | </indexterm>
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27 |
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28 | <sect2 role="package">
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29 | <title>Introduction to Util-linux</title>
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30 |
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31 | <para>
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32 | <application>Util-linux</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> after your LFS system was completed.
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35 | If you have installed <application>Linux-PAM</application>,
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36 | it's possible to build <command>su</command> and
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37 | <command>runuser</command> from <application>Util-linux</application>.
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38 | The <application>Shadow</application> maintainers recommend using
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39 | <command>su</command> from <application>Util-linux</application>
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40 | instead of the version from <application>Shadow</application>.
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41 | </para>
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42 |
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43 | &lfs110a_checked;
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44 |
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45 | <bridgehead renderas="sect3">Package Information</bridgehead>
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46 | <itemizedlist spacing="compact">
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47 | <listitem>
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48 | <para>
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49 | Download (HTTP): <ulink url="&util-linux-download-http;"/>
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50 | </para>
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51 | </listitem>
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52 | <listitem>
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53 | <para>
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54 | Download (FTP): <ulink url="&util-linux-download-ftp;"/>
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55 | </para>
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56 | </listitem>
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57 | <listitem>
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58 | <para>
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59 | Download MD5 sum: &util-linux-md5sum;
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60 | </para>
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61 | </listitem>
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62 | <listitem>
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63 | <para>
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64 | Download size: &util-linux-size;
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65 | </para>
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66 | </listitem>
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67 | <listitem>
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68 | <para>
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69 | Estimated disk space required: &util-linux-buildsize;
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70 | </para>
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71 | </listitem>
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72 | <listitem>
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73 | <para>
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74 | Estimated build time: &util-linux-time;
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75 | </para>
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76 | </listitem>
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77 | </itemizedlist>
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78 |
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79 | <bridgehead renderas="sect3">Util-linux Dependencies</bridgehead>
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80 |
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81 | <bridgehead renderas="sect4">Required</bridgehead>
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82 | <para role="required">
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83 | <xref linkend="linux-pam"/>
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84 | </para>
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85 |
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86 | <para condition="html" role="usernotes">
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87 | User Notes: <ulink url="&blfs-wiki;/shadow"/>
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88 | </para>
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89 | </sect2>
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90 |
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91 | <sect2 role="installation">
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92 | <title>Installation of Util-linux</title>
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93 |
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94 | <important>
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95 | <para>
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96 | The installation commands shown below are for installations where
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97 | <application>Linux-PAM</application> has been installed and
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98 | <application>Util-linux</application> is being rebuilt to
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99 | support the <application>Linux-PAM</application> installation.
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100 | </para>
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101 |
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102 | <para>
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103 | If you are upgrading <application>Util-linux</application>, follow
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104 | the instruction for <application>Util-linux</application> in
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105 | <ulink url='&lfs-dev;/chapter08/util-linux.html'>LFS</ulink>. If
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106 | <application>Linux-PAM</application> has been installed,
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107 | <command>su</command> and <command>runuser</command> will
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108 | automatically be built too. You should follow
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109 | <xref linkend='pam-util-linux'/> to set up the PAM
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110 | configuration in this case.
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111 | </para>
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112 | </important>
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113 |
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114 | <para>
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115 | Build <command>su</command> and <command>runuser</command> from
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116 | <application>Util-linux</application>:
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117 | </para>
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118 |
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119 | <screen><userinput>./configure ADJTIME_PATH=/var/lib/hwclock/adjtime \
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120 | --libdir=/usr/lib \
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121 | --docdir=/usr/share/doc/util-linux-&util-linux-version; \
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122 | --disable-chfn-chsh \
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123 | --disable-login \
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124 | --disable-nologin \
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125 | --disable-setpriv \
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126 | --disable-pylibmount \
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127 | --disable-static \
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128 | --without-python \
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129 | runstatedir=/run &&
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130 | make su runuser</userinput></screen>
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131 |
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132 | <para>
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133 | This package does not come with a test suite.
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134 | </para>
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135 |
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136 | <para>
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137 | Now, as the <systemitem class="username">root</systemitem> user:
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138 | </para>
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139 |
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140 | <screen role="root"><userinput>install -vm4755 su /usr/bin/su
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141 | install -vm0755 runuser /usr/sbin/runuser
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142 | find /usr/share/man -name su.1 -delete
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143 | install -vm0644 login-utils/{su,runuser}.1 /usr/share/man/man1</userinput></screen>
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144 |
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145 | </sect2>
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146 |
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147 | <sect2 role="commands">
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148 | <title>Command Explanations</title>
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149 |
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150 | <para>
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151 | <command>find /usr/share/man -name su.1 -delete</command>: This
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152 | is used to remove the man pages for <command>su</command> installed
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153 | from <application>Shadow</application>.
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154 | <application>Shadow</application> installs man pages with multiple
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155 | languages. They need to be removed to prevent
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156 | <command>man su</command> from picking up a translated man page
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157 | instead of <filename>/usr/share/man/man1/su.1</filename>.
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158 | </para>
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159 | </sect2>
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160 |
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161 | <sect2 role="configuration">
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162 | <title>Configuring Linux-PAM to Work with Util-linux</title>
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163 |
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164 | <sect3>
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165 | <title>Config Files</title>
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166 |
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167 | <para>
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168 | <filename>/etc/pam.d/su</filename>,
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169 | <filename>/etc/pam.d/su-l</filename>, and
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170 | <filename>/etc/pam.d/runuser</filename>
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171 | </para>
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172 |
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173 | <indexterm zone="util-linux pam.d">
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174 | <primary sortas="e-etc-pam.d-su">/etc/pam.d/su</primary>
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175 | </indexterm>
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176 |
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177 | <indexterm zone="util-linux pam.d">
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178 | <primary sortas="e-etc-pam.d-su">/etc/pam.d/su-l</primary>
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179 | </indexterm>
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180 |
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181 | <indexterm zone="util-linux pam.d">
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182 | <primary sortas="e-etc-pam.d-su">/etc/pam.d/runuser</primary>
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183 | </indexterm>
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184 | </sect3>
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185 |
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186 | <sect3 id='pam-util-linux'>
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187 | <title>Configuring the /etc/pam.d/ Files</title>
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188 |
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189 | <para>
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190 | As the <systemitem class="username">root</systemitem> user, create
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191 | the following <application>Linux-PAM</application> configuration files
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192 | in the <filename class="directory">/etc/pam.d/</filename> directory
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193 | (or add the contents to the <filename>/etc/pam.conf</filename> file)
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194 | using the following commands:
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195 | </para>
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196 |
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197 | <sect4>
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198 | <title>'su' and 'su-l'</title>
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199 |
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200 | <screen role="root"><userinput>cat > /etc/pam.d/su << "EOF"
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201 | <literal># Begin /etc/pam.d/su
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202 |
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203 | # always allow root
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204 | auth sufficient pam_rootok.so
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205 |
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206 | # Allow users in the wheel group to execute su without a password
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207 | # disabled by default
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208 | #auth sufficient pam_wheel.so trust use_uid
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209 |
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210 | # include system auth settings
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211 | auth include system-auth
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212 |
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213 | # limit su to users in the wheel group
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214 | auth required pam_wheel.so use_uid
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215 |
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216 | # include system account settings
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217 | account include system-account
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218 |
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219 | # Set default environment variables for the service user
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220 | session required pam_env.so
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221 |
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222 | # include system session settings
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223 | session include system-session
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224 |
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225 | # End /etc/pam.d/su</literal>
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226 | EOF
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227 | ln -sv su /etc/pam.d/su-l</userinput></screen>
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228 |
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229 | </sect4>
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230 |
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231 | <sect4>
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232 | <title>'runuser'</title>
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233 |
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234 | <screen role="root"><userinput>cat > /etc/pam.d/runuser << "EOF"
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235 | <literal># Begin /etc/pam.d/runuser
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236 |
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237 | auth sufficient pam_rootok.so
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238 | session include system-session
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239 |
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240 | # End /etc/pam.d/runuser</literal>
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241 | EOF</userinput></screen>
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242 |
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243 | <warning>
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244 | <para>
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245 | At this point, you should do a simple test to see if
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246 | <command>su</command> is working as expected. Open
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247 | another terminal and log in as a user, then
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248 | <command>su</command> to
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249 | <systemitem class="username">root</systemitem>.
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250 | If you do not see any errors, then all is well.
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251 | If you did receive errors, stop now and double check the
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252 | above configuration files manually. One obvious reason
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253 | for an error is if the user is not in group <systemitem
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254 | class="groupname">wheel</systemitem>. You may want to run
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255 | (as <systemitem class="username">root</systemitem>):
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256 | <command>usermod -a -G wheel
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257 | <replaceable><user></replaceable></command>.
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258 | Any other error is the sign of an error in the above
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259 | procedure. You can also run the test suite from the
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260 | <application>Linux-PAM</application> package to assist you
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261 | in determining the cause of the problem.
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262 | </para>
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263 | </warning>
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264 | </sect4>
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265 | </sect3>
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266 | </sect2>
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267 |
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268 | <sect2 role="content">
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269 | <title>Contents</title>
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270 |
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271 | <para>
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272 | Listed below are the newly installed programs along with short
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273 | descriptions.
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274 | </para>
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275 |
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276 | <segmentedlist>
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277 | <segtitle>Installed Programs</segtitle>
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278 |
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279 | <seglistitem>
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280 | <seg>
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281 | su and runuser
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282 | </seg>
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283 | </seglistitem>
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284 | </segmentedlist>
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285 |
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286 | <variablelist>
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287 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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288 | <?dbfo list-presentation="list"?>
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289 | <?dbhtml list-presentation="table"?>
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290 |
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291 | <varlistentry id="su">
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292 | <term><command>su</command></term>
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293 | <listitem>
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294 | <para>
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295 | runs a command with substitute user and group ID
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296 | </para>
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297 | <indexterm zone="util-linux su">
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298 | <primary sortas="b-su">su</primary>
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299 | </indexterm>
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300 | </listitem>
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301 | </varlistentry>
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302 |
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303 | <varlistentry id="runuser">
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304 | <term><command>runuser</command></term>
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305 | <listitem>
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306 | <para>
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307 | runs a command with substitute user and group ID; it's like
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308 | <command>su</command> but can only be used as
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309 | the <systemitem class='username'>root</systemitem> user.
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310 | </para>
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311 | <indexterm zone="util-linux runuser">
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312 | <primary sortas="b-util-linux-runuser">runuser</primary>
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313 | </indexterm>
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314 | </listitem>
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315 | </varlistentry>
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316 |
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317 | </variablelist>
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318 |
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319 | </sect2>
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320 |
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321 | </sect1>
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