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 openssh-download-http
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8 | "https://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-&openssh-version;.tar.gz">
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9 | <!ENTITY openssh-download-ftp
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10 | " "> <!-- at the moment, unable to connect via ftp: ken
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11 | "ftp://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-&openssh-version;.tar.gz"> -->
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12 | <!ENTITY openssh-md5sum "471912038124285c96918882ee190a22">
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13 | <!ENTITY openssh-size "1.8 MB">
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14 | <!ENTITY openssh-buildsize "44 MB (add 21 MB for tests)">
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15 | <!ENTITY openssh-time "0.2 SBU (Using parallelism=4;
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16 | running the tests takes about 28 minutes,
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17 | irrespective of processor speed)">
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18 | ]>
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19 |
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20 | <sect1 id="openssh" xreflabel="OpenSSH-&openssh-version;">
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21 | <?dbhtml filename="openssh.html"?>
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22 |
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23 |
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24 | <title>OpenSSH-&openssh-version;</title>
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25 |
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26 | <indexterm zone="openssh">
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27 | <primary sortas="a-OpenSSH">OpenSSH</primary>
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28 | </indexterm>
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29 |
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30 | <sect2 role="package">
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31 | <title>Introduction to OpenSSH</title>
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32 |
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33 | <para>
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34 | The <application>OpenSSH</application> package contains
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35 | <command>ssh</command> clients and the <command>sshd</command> daemon.
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36 | This is useful for encrypting authentication and subsequent traffic over
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37 | a network. The <command>ssh</command> and <command>scp</command> commands
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38 | are secure implementations of <command>telnet</command> and
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39 | <command>rcp</command> respectively.
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40 | </para>
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41 |
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42 | &lfs112_checked;
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43 |
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44 | <bridgehead renderas="sect3">Package Information</bridgehead>
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45 | <itemizedlist spacing="compact">
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46 | <listitem>
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47 | <para>
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48 | Download (HTTP): <ulink url="&openssh-download-http;"/>
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49 | </para>
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50 | </listitem>
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51 | <listitem>
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52 | <para>
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53 | Download (FTP): <ulink url="&openssh-download-ftp;"/>
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54 | </para>
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55 | </listitem>
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56 | <listitem>
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57 | <para>
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58 | Download MD5 sum: &openssh-md5sum;
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59 | </para>
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60 | </listitem>
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61 | <listitem>
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62 | <para>
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63 | Download size: &openssh-size;
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64 | </para>
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65 | </listitem>
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66 | <listitem>
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67 | <para>
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68 | Estimated disk space required: &openssh-buildsize;
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69 | </para>
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70 | </listitem>
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71 | <listitem>
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72 | <para>
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73 | Estimated build time: &openssh-time;
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74 | </para>
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75 | </listitem>
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76 | </itemizedlist>
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77 | <!--
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78 | <bridgehead renderas="sect3">Additional Downloads</bridgehead>
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79 | <itemizedlist spacing="compact">
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80 | <listitem>
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81 | <para>
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82 | Required patch:
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83 | <ulink url="&patch-root;/openssh-&openssh-version;-glibc_2.31_fix-1.patch"/>
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84 | </para>
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85 | </listitem>
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86 | </itemizedlist>
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87 | -->
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88 | <bridgehead renderas="sect3">OpenSSH Dependencies</bridgehead>
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89 |
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90 | <bridgehead renderas="sect4">Optional</bridgehead>
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91 | <para role="optional">
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92 | <xref linkend="gdb"/> (for tests),
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93 | <xref linkend="linux-pam"/>,
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94 | <xref linkend="x-window-system"/>,
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95 | <xref linkend="mitkrb"/>,
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96 | <xref linkend="which"/> (for tests),
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97 | <ulink url="https://www.thrysoee.dk/editline/">libedit</ulink>,
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98 | <ulink url="https://www.libressl.org/">LibreSSL Portable</ulink>,
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99 | <ulink url="https://github.com/OpenSC/OpenSC/wiki">OpenSC</ulink>, and
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100 | <ulink url="http://www.citi.umich.edu/projects/smartcard/sectok.html">libsectok</ulink>
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101 | </para>
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102 |
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103 | <bridgehead renderas="sect4">Optional Runtime (Used only to gather entropy)</bridgehead>
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104 | <para role="optional">
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105 | <!--<xref role="runtime" linkend="openjdk"/>, Not seen in 8.8p1 -->
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106 | <xref role="runtime" linkend="net-tools"/>, and
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107 | <xref role="runtime" linkend="sysstat"/>
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108 | </para>
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109 |
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110 | <para condition="html" role="usernotes">
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111 | User Notes: <ulink url="&blfs-wiki;/OpenSSH"/>
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112 | </para>
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113 | </sect2>
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114 |
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115 | <sect2 role="installation">
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116 | <title>Installation of OpenSSH</title>
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117 |
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118 | <para>
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119 | <application>OpenSSH</application> runs as two processes when connecting
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120 | to other computers. The first process is a privileged process and controls
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121 | the issuance of privileges as necessary. The second process communicates
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122 | with the network. Additional installation steps are necessary to set up
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123 | the proper environment, which are performed by issuing the following
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124 | commands as the <systemitem class="username">root</systemitem> user:
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125 | </para>
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126 |
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127 | <screen role="root"><userinput>install -v -m700 -d /var/lib/sshd &&
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128 | chown -v root:sys /var/lib/sshd &&
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129 |
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130 | groupadd -g 50 sshd &&
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131 | useradd -c 'sshd PrivSep' \
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132 | -d /var/lib/sshd \
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133 | -g sshd \
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134 | -s /bin/false \
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135 | -u 50 sshd</userinput></screen>
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136 | <!--
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137 | <para>
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138 | Apply a patch to allow OpenSSH to build and function with
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139 | <application>Glibc-2.31</application> and later:
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140 | </para>
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141 |
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142 | <screen><userinput remap="pre">patch -Np1 -i ../openssh-&openssh-version;-glibc_2.31_fix-1.patch</userinput></screen>
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143 | -->
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144 |
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145 | <!-- Applied in 8.5p1
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146 | <para>
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147 | First, adapt <application>ssh-copy-id</application> to changes
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148 | in bash-5.1:
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149 | </para>
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150 |
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151 | <screen><userinput remap="pre">sed -e '/INSTALLKEYS_SH/s/)//' -e '260a\ )' -i contrib/ssh-copy-id</userinput></screen>
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152 |
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153 | <para>
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154 | Next, fix an issue on platforms other than x86_64:
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155 | </para>
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156 | <screen><userinput remap="pre">if [ "$(uname -m)" != "x86_64" ]; then
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157 | l1="#ifdef __NR_pselect6_time64"
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158 | l2=" SC_ALLOW(__NR_pselect6_time64),"
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159 | l3="#endif"
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160 | sed -e "/^#ifdef __NR_read$/ i $l1\n$l2\n$l3" \
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161 | -i sandbox-seccomp-filter.c
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162 | fi</userinput></screen>
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163 | -->
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164 | <para>
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165 | Install <application>OpenSSH</application> by running the following
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166 | commands:
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167 | </para>
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168 |
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169 | <!-- -\-with-md5-passwords used to be here, but a comment inside of a <screen>
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170 | block leaves an eyesore. -->
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171 | <screen><userinput>./configure --prefix=/usr \
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172 | --sysconfdir=/etc/ssh \
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173 | --with-privsep-path=/var/lib/sshd \
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174 | --with-default-path=/usr/bin \
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175 | --with-superuser-path=/usr/sbin:/usr/bin \
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176 | --with-pid-dir=/run &&
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177 | make</userinput></screen>
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178 |
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179 | <para>
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180 | The test suite requires an installed copy of <command>scp</command> to
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181 | complete the multiplexing tests. To run the test suite, first copy the
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182 | <command>scp</command> program to
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183 | <filename class="directory">/usr/bin</filename>, making sure that you
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184 | backup any existing copy first.
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185 | </para>
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186 | <!-- I got all tests passed without this with 9.0p1. Apr 13, 2022.
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187 | <para>
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188 | If you wish to run the tests, remove a test suite that is not valid on
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189 | Linux-based platforms:
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190 | </para>
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191 |
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192 | <screen><userinput>sed -i 's/conch-ciphers//' regress/Makefile</userinput></screen>
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193 | -->
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194 | <para>
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195 | To test the results, issue: <command>make -j1 tests</command>.
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196 | <!--One test, <filename>key options</filename>, fails when run in chroot.-->
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197 | </para>
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198 |
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199 | <!-- commenting this, I get "all tests passed" [ ken ]
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200 | NB tests should be run as _user_ but the role in the comment is root
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201 |
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202 | commenting [ bruce ]: There are a couple of tests that want root.
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203 | The log mentions that SUDO is not set. These skipped tests are
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204 | ignored and the end says 'all tests passed' even when not root
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205 |
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206 | <para>
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207 | To run the test suite, issue the following commands:
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208 | </para>
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209 |
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210 | <screen role="root"><userinput>make tests 2>&1 | tee check.log
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211 | grep FATAL check.log</userinput></screen>
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212 |
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213 | <para>
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214 | If the above command produces no 'FATAL' errors, then proceed with the
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215 | installation, as the <systemitem class="username">root</systemitem> user:
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216 | </para>-->
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217 | <para>
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218 | Now, as the <systemitem class="username">root</systemitem> user:
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219 | </para>
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220 |
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221 | <screen role="root"><userinput>make install &&
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222 | install -v -m755 contrib/ssh-copy-id /usr/bin &&
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223 |
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224 | install -v -m644 contrib/ssh-copy-id.1 \
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225 | /usr/share/man/man1 &&
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226 | install -v -m755 -d /usr/share/doc/openssh-&openssh-version; &&
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227 | install -v -m644 INSTALL LICENCE OVERVIEW README* \
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228 | /usr/share/doc/openssh-&openssh-version;</userinput></screen>
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229 | </sect2>
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230 |
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231 | <sect2 role="commands">
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232 | <title>Command Explanations</title>
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233 |
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234 | <para>
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235 | <parameter>--sysconfdir=/etc/ssh</parameter>: This prevents the
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236 | configuration files from being installed in
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237 | <filename class="directory">/usr/etc</filename>.
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238 | </para>
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239 |
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240 | <!--
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241 | <para>
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242 | <parameter>-\-with-md5-passwords</parameter>: This enables the use of MD5
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243 | passwords.
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244 | </para>
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245 | -->
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246 |
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247 | <para>
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248 | <parameter>--with-default-path=/usr/bin</parameter> and
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249 | <parameter>--with-superuser-path=/usr/sbin:/usr/bin</parameter>:
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250 | These set <envar>PATH</envar> consistent with LFS and BLFS
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251 | <application>Shadow</application> package.
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252 | </para>
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253 |
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254 | <para>
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255 | <parameter>--with-pid-dir=/run</parameter>: This prevents
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256 | <application>OpenSSH</application> from referring to deprecated
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257 | <filename class="directory">/var/run</filename>.
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258 | </para>
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259 |
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260 | <para>
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261 | <option>--with-pam</option>: This parameter enables
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262 | <application>Linux-PAM</application> support in the build.
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263 | </para>
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264 |
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265 | <para>
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266 | <option>--with-xauth=/usr/bin/xauth</option>: Set the default
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267 | location for the <command>xauth</command> binary for X authentication.
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268 | Change the location if <command>xauth</command> will be installed to a
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269 | different path. This can also be controlled from
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270 | <filename>sshd_config</filename> with the XAuthLocation keyword. You can
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271 | omit this switch if <application>Xorg</application> is already installed.
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272 | </para>
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273 |
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274 | <para>
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275 | <option>--with-kerberos5=/usr</option>: This option is used to
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276 | include Kerberos 5 support in the build.
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277 | </para>
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278 |
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279 | <para>
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280 | <option>--with-libedit</option>: This option enables line editing
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281 | and history features for <command>sftp</command>.
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282 | </para>
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283 |
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284 | </sect2>
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285 |
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286 | <sect2 role="configuration">
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287 | <title>Configuring OpenSSH</title>
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288 |
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289 | <sect3 id="openssh-config">
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290 | <title>Config Files</title>
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291 |
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292 | <para>
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293 | <filename>~/.ssh/*</filename>,
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294 | <filename>/etc/ssh/ssh_config</filename>, and
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295 | <filename>/etc/ssh/sshd_config</filename>
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296 | </para>
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297 |
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298 | <indexterm zone="openssh openssh-config">
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299 | <primary sortas="e-AA.ssh">~/.ssh/*</primary>
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300 | </indexterm>
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301 |
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302 | <indexterm zone="openssh openssh-config">
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303 | <primary sortas="e-etc-ssh-ssh_config">/etc/ssh/ssh_config</primary>
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304 | </indexterm>
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305 |
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306 | <indexterm zone="openssh openssh-config">
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307 | <primary sortas="e-etc-ssh-sshd_config">/etc/ssh/sshd_config</primary>
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308 | </indexterm>
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309 |
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310 | <para>
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311 | There are no required changes to any of these files. However,
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312 | you may wish to view the
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313 | <filename class='directory'>/etc/ssh/</filename> files and make any
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314 | changes appropriate for the security of your system. One recommended
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315 | change is that you disable
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316 | <systemitem class='username'>root</systemitem> login via
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317 | <command>ssh</command>. Execute the following command as the
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318 | <systemitem class='username'>root</systemitem> user to disable
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319 | <systemitem class='username'>root</systemitem> login via
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320 | <command>ssh</command>:
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321 | </para>
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322 |
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323 | <screen role="root"><userinput>echo "PermitRootLogin no" >> /etc/ssh/sshd_config</userinput></screen>
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324 |
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325 | <para>
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326 | If you want to be able to log in without typing in your password, first
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327 | create ~/.ssh/id_rsa and ~/.ssh/id_rsa.pub with
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328 | <command>ssh-keygen</command> and then copy ~/.ssh/id_rsa.pub to
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329 | ~/.ssh/authorized_keys on the remote computer that you want to log into.
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330 | You'll need to change REMOTE_USERNAME and REMOTE_HOSTNAME for the username and hostname of the remote
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331 | computer and you'll also need to enter your password for the ssh-copy-id command
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332 | to succeed:
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333 | </para>
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334 |
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335 | <screen><userinput>ssh-keygen &&
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336 | ssh-copy-id -i ~/.ssh/id_rsa.pub <replaceable>REMOTE_USERNAME</replaceable>@<replaceable>REMOTE_HOSTNAME</replaceable></userinput></screen>
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337 |
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338 | <para>
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339 | Once you've got passwordless logins working it's actually more secure
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340 | than logging in with a password (as the private key is much longer than
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341 | most people's passwords). If you would like to now disable password
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342 | logins, as the <systemitem class="username">root</systemitem> user:
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343 | </para>
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344 |
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345 |
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346 | <screen role="root"><userinput>echo "PasswordAuthentication no" >> /etc/ssh/sshd_config &&
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347 | echo "KbdInteractiveAuthentication no" >> /etc/ssh/sshd_config</userinput></screen>
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348 |
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349 | <para>
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350 | If you added <application>Linux-PAM</application> support and you want
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351 | ssh to use it then you will need to add a configuration file for
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352 | <application>sshd</application> and enable use of
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353 | <application>LinuxPAM</application>. Note, ssh only uses PAM to check
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354 | passwords, if you've disabled password logins these commands are not
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355 | needed. If you want to use PAM, issue the following commands as the
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356 | <systemitem class='username'>root</systemitem> user:
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357 | </para>
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358 |
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359 | <screen role="root"><userinput>sed 's@d/login@d/sshd@g' /etc/pam.d/login > /etc/pam.d/sshd &&
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360 | chmod 644 /etc/pam.d/sshd &&
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361 | echo "UsePAM yes" >> /etc/ssh/sshd_config</userinput></screen>
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362 |
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363 | <para>
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364 | Additional configuration information can be found in the man
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365 | pages for <command>sshd</command>, <command>ssh</command> and
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366 | <command>ssh-agent</command>.
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367 | </para>
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368 | </sect3>
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369 |
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370 | <sect3 id="openssh-init">
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371 | <title><phrase revision="sysv">Boot Script</phrase>
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372 | <phrase revision="systemd">Systemd Unit</phrase></title>
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373 |
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374 | <para revision="sysv">
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375 | To start the SSH server at system boot, install the
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376 | <filename>/etc/rc.d/init.d/sshd</filename> init script included
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377 | in the <xref linkend="bootscripts"/> package.
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378 | </para>
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379 |
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380 | <para revision="systemd">
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381 | To start the SSH server at system boot, install the
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382 | <filename>sshd.service</filename> unit included in the
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383 | <xref linkend="systemd-units"/> package.
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384 | </para>
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385 |
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386 | <indexterm zone="openssh openssh-init">
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387 | <primary sortas="f-sshd">sshd</primary>
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388 | </indexterm>
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389 |
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390 | <screen role="root"><userinput>make install-sshd</userinput></screen>
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391 | </sect3>
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392 | </sect2>
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393 |
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394 | <sect2 role="content">
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395 | <title>Contents</title>
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396 |
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397 | <segmentedlist>
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398 | <segtitle>Installed Programs</segtitle>
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399 | <segtitle>Installed Libraries</segtitle>
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400 | <segtitle>Installed Directories</segtitle>
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401 |
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402 | <seglistitem>
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403 | <seg>
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404 | scp, sftp, <!--slogin (symlink to ssh),--> ssh, ssh-add, ssh-agent,
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405 | ssh-copy-id, ssh-keygen, ssh-keyscan, and sshd
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406 | </seg>
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407 | <seg>
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408 | None
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409 | </seg>
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410 | <seg>
|
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411 | /etc/ssh,
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412 | /usr/share/doc/openssh-&openssh-version;, and
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413 | /var/lib/sshd
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414 | </seg>
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415 | </seglistitem>
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416 | </segmentedlist>
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417 |
|
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418 | <variablelist>
|
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419 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
|
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420 | <?dbfo list-presentation="list"?>
|
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421 | <?dbhtml list-presentation="table"?>
|
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422 |
|
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423 | <varlistentry id="scp">
|
---|
424 | <term><command>scp</command></term>
|
---|
425 | <listitem>
|
---|
426 | <para>
|
---|
427 | is a file copy program that acts like <command>rcp</command> except
|
---|
428 | it uses an encrypted protocol
|
---|
429 | </para>
|
---|
430 | <indexterm zone="openssh scp">
|
---|
431 | <primary sortas="b-scp">scp</primary>
|
---|
432 | </indexterm>
|
---|
433 | </listitem>
|
---|
434 | </varlistentry>
|
---|
435 |
|
---|
436 | <varlistentry id="sftp">
|
---|
437 | <term><command>sftp</command></term>
|
---|
438 | <listitem>
|
---|
439 | <para>
|
---|
440 | is an FTP-like program that works over the SSH1 and SSH2 protocols
|
---|
441 | </para>
|
---|
442 | <indexterm zone="openssh sftp">
|
---|
443 | <primary sortas="b-sftp">sftp</primary>
|
---|
444 | </indexterm>
|
---|
445 | </listitem>
|
---|
446 | </varlistentry>
|
---|
447 | <!-- Not installed anymore as of 8.5p1
|
---|
448 | <varlistentry id="slogin">
|
---|
449 | <term><command>slogin</command></term>
|
---|
450 | <listitem>
|
---|
451 | <para>
|
---|
452 | is a symlink to <command>ssh</command>
|
---|
453 | </para>
|
---|
454 | <indexterm zone="openssh slogin">
|
---|
455 | <primary sortas="b-slogin">slogin</primary>
|
---|
456 | </indexterm>
|
---|
457 | </listitem>
|
---|
458 | </varlistentry>
|
---|
459 | -->
|
---|
460 | <varlistentry id="ssh">
|
---|
461 | <term><command>ssh</command></term>
|
---|
462 | <listitem>
|
---|
463 | <para>
|
---|
464 | is an <command>rlogin</command>/<command>rsh</command>-like client
|
---|
465 | program except it uses an encrypted protocol
|
---|
466 | </para>
|
---|
467 | <indexterm zone="openssh ssh">
|
---|
468 | <primary sortas="b-ssh">ssh</primary>
|
---|
469 | </indexterm>
|
---|
470 | </listitem>
|
---|
471 | </varlistentry>
|
---|
472 |
|
---|
473 | <varlistentry id="sshd">
|
---|
474 | <term><command>sshd</command></term>
|
---|
475 | <listitem>
|
---|
476 | <para>
|
---|
477 | is a daemon that listens for <command>ssh</command> login requests
|
---|
478 | </para>
|
---|
479 | <indexterm zone="openssh sshd">
|
---|
480 | <primary sortas="b-sshd">sshd</primary>
|
---|
481 | </indexterm>
|
---|
482 | </listitem>
|
---|
483 | </varlistentry>
|
---|
484 |
|
---|
485 | <varlistentry id="ssh-add">
|
---|
486 | <term><command>ssh-add</command></term>
|
---|
487 | <listitem>
|
---|
488 | <para>
|
---|
489 | is a tool which adds keys to the <command>ssh-agent</command>
|
---|
490 | </para>
|
---|
491 | <indexterm zone="openssh ssh-add">
|
---|
492 | <primary sortas="b-ssh-add">ssh-add</primary>
|
---|
493 | </indexterm>
|
---|
494 | </listitem>
|
---|
495 | </varlistentry>
|
---|
496 |
|
---|
497 | <varlistentry id="ssh-agent">
|
---|
498 | <term><command>ssh-agent</command></term>
|
---|
499 | <listitem>
|
---|
500 | <para>
|
---|
501 | is an authentication agent that can store private keys
|
---|
502 | </para>
|
---|
503 | <indexterm zone="openssh ssh-agent">
|
---|
504 | <primary sortas="b-ssh-agent">ssh-agent</primary>
|
---|
505 | </indexterm>
|
---|
506 | </listitem>
|
---|
507 | </varlistentry>
|
---|
508 |
|
---|
509 | <varlistentry id="ssh-copy-id">
|
---|
510 | <term><command>ssh-copy-id</command></term>
|
---|
511 | <listitem>
|
---|
512 | <para>
|
---|
513 | is a script that enables logins on remote machines using local keys
|
---|
514 | </para>
|
---|
515 | <indexterm zone="openssh ssh-copy-id">
|
---|
516 | <primary sortas="b-ssh-copy-id">ssh-copy-id</primary>
|
---|
517 | </indexterm>
|
---|
518 | </listitem>
|
---|
519 | </varlistentry>
|
---|
520 |
|
---|
521 | <varlistentry id="ssh-keygen">
|
---|
522 | <term><command>ssh-keygen</command></term>
|
---|
523 | <listitem>
|
---|
524 | <para>
|
---|
525 | is a key generation tool
|
---|
526 | </para>
|
---|
527 | <indexterm zone="openssh ssh-keygen">
|
---|
528 | <primary sortas="b-ssh-keygen">ssh-keygen</primary>
|
---|
529 | </indexterm>
|
---|
530 | </listitem>
|
---|
531 | </varlistentry>
|
---|
532 |
|
---|
533 | <varlistentry id="ssh-keyscan">
|
---|
534 | <term><command>ssh-keyscan</command></term>
|
---|
535 | <listitem>
|
---|
536 | <para>
|
---|
537 | is a utility for gathering public host keys from a number of hosts
|
---|
538 | </para>
|
---|
539 | <indexterm zone="openssh ssh-keyscan">
|
---|
540 | <primary sortas="b-ssh-keyscan">ssh-keyscan</primary>
|
---|
541 | </indexterm>
|
---|
542 | </listitem>
|
---|
543 | </varlistentry>
|
---|
544 |
|
---|
545 | </variablelist>
|
---|
546 | </sect2>
|
---|
547 |
|
---|
548 | </sect1>
|
---|