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 sudo-download-http "http://www.sudo.ws/sudo/dist/sudo-&sudo-version;.tar.gz">
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8 | <!ENTITY sudo-download-ftp "ftp://ftp.twaren.net/Unix/Security/Sudo/sudo-&sudo-version;.tar.gz">
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9 | <!ENTITY sudo-md5sum "000f458e7391be9fdf459a9ad6a4912a">
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10 | <!ENTITY sudo-size "1.4 MB">
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11 | <!ENTITY sudo-buildsize "13 MB">
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12 | <!ENTITY sudo-time "0.2 SBU">
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13 | ]>
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14 |
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15 | <sect1 id="sudo" xreflabel="sudo-&sudo-version;">
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16 | <?dbhtml filename="sudo.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>Sudo-&sudo-version;</title>
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24 |
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25 | <indexterm zone="sudo">
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26 | <primary sortas="a-sudo">sudo</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 Sudo</title>
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31 |
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32 | <para>The <application>sudo</application> package allows a system
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33 | administrator to give certain users (or groups of users) the ability to run
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34 | some (or all) commands as
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35 | <systemitem class="username">root</systemitem> or another user while
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36 | logging the commands and arguments.</para>
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37 |
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38 | &lfs70_checked;
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39 |
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40 | <bridgehead renderas="sect3">Package Information</bridgehead>
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41 | <itemizedlist spacing="compact">
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42 | <listitem>
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43 | <para>Download (HTTP): <ulink url="&sudo-download-http;"/></para>
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44 | </listitem>
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45 | <listitem>
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46 | <para>Download (FTP): <ulink url="&sudo-download-ftp;"/></para>
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47 | </listitem>
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48 | <listitem>
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49 | <para>Download MD5 sum: &sudo-md5sum;</para>
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50 | </listitem>
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51 | <listitem>
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52 | <para>Download size: &sudo-size;</para>
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53 | </listitem>
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54 | <listitem>
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55 | <para>Estimated disk space required: &sudo-buildsize;</para>
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56 | </listitem>
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57 | <listitem>
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58 | <para>Estimated build time: &sudo-time;</para>
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59 | </listitem>
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60 | </itemizedlist>
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61 |
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62 | <bridgehead renderas="sect3">Additional Downloads</bridgehead>
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63 | <itemizedlist spacing="compact">
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64 | <listitem>
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65 | <para>Required patch: <ulink
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66 | url="&patch-root;/sudo-&sudo-version;-fprintf_debug-1.patch"/></para>
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67 | </listitem>
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68 | </itemizedlist>
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69 |
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70 | <bridgehead renderas="sect3">Sudo Dependencies</bridgehead>
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71 |
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72 | <bridgehead renderas="sect4">Optional</bridgehead>
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73 | <para role="optional"><xref linkend="linux-pam"/>,
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74 | <ulink url="ftp://ftp.nrl.navy.mil/pub/security/opie">Opie</ulink>,
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75 | <ulink url="http://www.rsa.com/node.aspx?id=1156">SecurID</ulink>,
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76 | <ulink url="http://www.fwtk.org/">FWTK</ulink>,
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77 | an <xref linkend="server-mail"/> (that provides a
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78 | <command>sendmail</command> command),
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79 | <ulink url="http://www.pdc.kth.se/kth-krb/">krb4</ulink>,
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80 | <xref linkend="heimdal"/> or <xref linkend="mitkrb"/>,
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81 | <xref linkend="openldap"/>, and
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82 | <ulink url="http://www.openafs.org/">AFS</ulink></para>
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83 |
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84 | <para condition="html" role="usernotes">User Notes:
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85 | <ulink url="&blfs-wiki;/sudo"/></para>
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86 |
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87 | </sect2>
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88 |
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89 | <sect2 role="installation">
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90 | <title>Installation of Sudo</title>
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91 |
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92 | <para>Install <application>sudo</application> by running
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93 | the following commands:</para>
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94 |
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95 | <screen><userinput>patch -p1 < ../sudo-&sudo-version;-fprintf_debug-1.patch &&
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96 | ./configure --prefix=/usr \
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97 | --libexecdir=/usr/lib \
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98 | --with-ignore-dot \
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99 | --with-all-insults \
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100 | --enable-shell-sets-home \
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101 | --disable-root-sudo \
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102 | --with-logfac=auth \
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103 | --without-pam \
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104 | --without-sendmail &&
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105 | make</userinput></screen>
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106 |
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107 | <para>This package does not come with a test suite.</para>
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108 |
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109 | <para>Now, as the <systemitem class="username">root</systemitem> user:</para>
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110 |
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111 | <screen role="root"><userinput>make install</userinput></screen>
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112 |
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113 | </sect2>
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114 |
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115 | <sect2 role="commands">
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116 | <title>Command Explanations</title>
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117 |
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118 | <para><command>patch -p1 < ...</command>: This patch fixes a
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119 | vulnerability in the debugging code in sudo versions 1.8.0 through 1.8.3p1
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120 | that can be used to crash sudo or potentially allow an unauthorized user to
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121 | achieve root privileges.</para>
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122 |
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123 | <para><option>--with-ignore-dot</option>: This switch causes
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124 | <application>sudo</application> to ignore '.' in the PATH.</para>
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125 |
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126 | <para><option>--with-all-insults</option>: This switch includes all the
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127 | <application>sudo</application> insult sets.</para>
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128 |
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129 | <para><option>--enable-shell-sets-home</option>: This switch sets HOME to
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130 | the target user in shell mode.</para>
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131 |
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132 | <para><option>--disable-root-sudo</option>: This switch keeps the
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133 | <systemitem class="username">root</systemitem> user from running sudo,
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134 | preventing users from chaining commands to get a root shell.</para>
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135 |
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136 | <para><option>--with-logfac=auth</option>: This switch forces use of the
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137 | auth facility for logging.</para>
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138 |
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139 | <para><option>--without-pam</option>: This switch disables the use of
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140 | <application>PAM</application> authentication. Omit if you have
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141 | <application>PAM</application> installed.</para>
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142 |
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143 | <para><option>--without-sendmail</option>: This switch disables the use of
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144 | sendmail. Remove if you have a sendmail compatible MTA.</para>
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145 |
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146 | <para><option>--enable-noargs-shell</option>: This switch allows
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147 | <application>sudo</application> to run a shell if invoked with no
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148 | arguments.</para>
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149 |
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150 | <note>
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151 | <para>There are many options to <application>sudo</application>'s
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152 | <command>configure</command> command. Check the
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153 | <command>configure --help</command> output for a complete list.</para>
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154 | </note>
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155 |
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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 Sudo</title>
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160 |
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161 | <sect3 id="sudo-config">
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162 | <title>Config File</title>
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163 |
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164 | <para><filename>/etc/sudoers</filename></para>
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165 |
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166 | <indexterm zone="sudo sudo-config">
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167 | <primary sortas="e-etc-sudoers">/etc/sudoers</primary>
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168 | </indexterm>
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169 |
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170 | </sect3>
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171 |
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172 | <sect3>
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173 | <title>Configuration Information</title>
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174 |
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175 | <para>The <filename>sudoers</filename> file can be quite complicated. It
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176 | is composed of two types of entries: aliases (basically variables) and
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177 | user specifications (which specify who may run what). The installation
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178 | installs a default configuration that has no privileges installed for any
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179 | user.</para>
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180 |
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181 | <para>One example usage is to allow the system administrator to execute
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182 | any program without typing a password each time root privileges are
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183 | needed. This can be configured as:</para>
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184 |
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185 | <screen># User alias specification
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186 | User_Alias ADMIN = YourLoginId
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187 |
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188 | # Allow people in group ADMIN to run all commands without a password
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189 | ADMIN ALL = NOPASSWD: ALL</screen>
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190 |
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191 | <para>For details, see <command>man sudoers</command>.</para>
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192 |
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193 | <note>
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194 | <para>The <application>Sudo</application> developers highly recommend
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195 | using the <command>visudo</command> program to edit the
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196 | <filename>sudoers</filename> file. This will provide basic sanity
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197 | checking like syntax parsing and file permission to avoid some possible
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198 | mistakes that could lead to a vulnerable configuration.</para>
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199 | </note>
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200 |
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201 | <para>If you've built <application>Sudo</application> with
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202 | <application>PAM</application> support, issue the following
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203 | command as the <systemitem class="username">root</systemitem> user
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204 | to create the <application>PAM</application> configuration file:</para>
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205 |
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206 | <screen role="root"><userinput>cat > /etc/pam.d/sudo << "EOF" &&
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207 | # Begin /etc/pam.d/sudo
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208 |
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209 | # include the default auth settings
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210 | auth include system-auth
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211 |
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212 | # include the default account settings
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213 | account include system-account
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214 |
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215 | # Use xauth keys (if available)
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216 | session optional pam_xauth.so
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217 |
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218 | # Set default environment variables for the service user
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219 | session required pam_env.so
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220 |
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221 | # include system session defaults
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222 | session include system-session
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223 |
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224 | # End /etc/pam.d/sudo
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225 | EOF
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226 | chmod 644 /etc/pam.d/sudo</userinput></screen>
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227 |
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228 | </sect3>
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229 |
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230 | </sect2>
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231 |
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232 | <sect2 role="content">
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233 | <title>Contents</title>
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234 |
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235 | <segmentedlist>
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236 | <segtitle>Installed Programs</segtitle>
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237 | <segtitle>Installed Library</segtitle>
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238 | <segtitle>Installed Directories</segtitle>
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239 |
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240 | <seglistitem>
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241 | <seg>sudo, sudoedit, and visudo</seg>
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242 | <seg>sudo_noexec.so</seg>
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243 | <seg>None</seg>
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244 | </seglistitem>
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245 | </segmentedlist>
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246 |
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247 | <variablelist>
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248 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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249 | <?dbfo list-presentation="list"?>
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250 | <?dbhtml list-presentation="table"?>
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251 |
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252 | <varlistentry id="sudo_prog">
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253 | <term><command>sudo</command></term>
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254 | <listitem>
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255 | <para>executes a command as another user as permitted by
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256 | the <filename>/etc/sudoers</filename> configuration file.
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257 | </para>
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258 | <indexterm zone="sudo sudo">
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259 | <primary sortas="b-sudo">sudo</primary>
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260 | </indexterm>
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261 | </listitem>
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262 | </varlistentry>
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263 |
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264 | <varlistentry id="sudoedit">
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265 | <term><command>sudoedit</command></term>
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266 | <listitem>
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267 | <para>is a hard link to <command>sudo</command> that implies
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268 | the <option>-e</option> option to invoke an editor as another
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269 | user.</para>
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270 | <indexterm zone="sudo sudoedit">
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271 | <primary sortas="b-sudoedit">sudoedit</primary>
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272 | </indexterm>
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273 | </listitem>
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274 | </varlistentry>
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275 |
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276 | <varlistentry id="visudo">
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277 | <term><command>visudo</command></term>
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278 | <listitem>
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279 | <para>allows for safer editing of the <filename>sudoers</filename>
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280 | file.</para>
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281 | <indexterm zone="sudo visudo">
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282 | <primary sortas="b-visudo">visudo</primary>
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283 | </indexterm>
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284 | </listitem>
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285 | </varlistentry>
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286 |
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287 |
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288 | <varlistentry id="sudo_noexec">
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289 | <term><filename class='libraryfile'>sudo_noexec.so</filename></term>
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290 | <listitem>
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291 | <para>enables support for the "noexec" functionality which prevents
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292 | a dynamically-linked program being run by sudo from executing
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293 | another program (think shell escapes).</para>
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294 | <indexterm zone="sudo sudo_noexec">
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295 | <primary sortas="c-sudo_noexec">sudo_noexec.so</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 | </variablelist>
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301 |
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302 | </sect2>
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303 |
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304 | </sect1>
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