source: chapter06/openssh.xml@ fa0686e

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../general.ent">
  %general-entities;
]>
<sect1 id="ch-system-openssh" role="wrap" arch="raq2">
<title>OpenSSH-&openssh-version;</title>
<?dbhtml filename="openssh.html"?>

<indexterm zone="ch-system-openssh"><primary sortas="a-openssh">OpenSSH</primary></indexterm>

<sect2 role="package"><title/>
<para> The OpenSSH package contains ssh clients and the sshd daemon. This is useful
for encrypting authentication and subsequent traffic over a network..</para>

<segmentedlist>
<segtitle>&buildtime;</segtitle>
<segtitle>&diskspace;</segtitle>
<seglistitem><seg>0.4 SBU</seg><seg>13.3 MB</seg></seglistitem>
</segmentedlist>

<segmentedlist>
<segtitle>OpenSSH installation depends on</segtitle>
<seglistitem><seg>OpenSSL</seg></seglistitem>
</segmentedlist>
</sect2>

<sect2 role="installation">
<title>Installation of OpenSSH</title>

<para>Need to create a chroot-jail for OpenSSH:</para>

<screen><userinput>mkdir /var/empty
chown root:sys /var/empty
groupadd sshd
useradd -c 'sshd privsep' -d /var/empty -g sshd -s /bin/false sshd</userinput></screen>

<para>Prepare OpenSSH for compilation:</para>

<screen><userinput>./configure --prefix=/usr --sysconfdir=/etc/ssh \
    --libexecdir=/usr/sbin --with-md5-passwords</userinput></screen>

<para>Compile the package:</para>

<screen><userinput>make</userinput></screen>

<para>Install the package:</para>

<screen><userinput>make install</userinput></screen>

<para>Make OpenSSH usable by the root user.</para>

<screen><userinput>echo "PermitRootLogin yes" &gt;&gt; /etc/ssh/sshd_config</userinput></screen>

</sect2>

<sect2 id="contents-openssh" role="content"><title>Contents of OpenSSH</title>

<segmentedlist>
<segtitle>Installed programs</segtitle>
<seglistitem><seg>ssh, sshd, ssh-agent, ssh-add, sftp, scp, ssh-keygen,
sftp-server and ssh-keyscan</seg></seglistitem>
</segmentedlist>

<variablelist><bridgehead renderas="sect3">Short Descriptions</bridgehead>
<?dbfo list-presentation="list"?>

<varlistentry id="ssh">
<term><command>ssh</command></term>
<listitem>
<para>The basic rlogin/rsh-like client program</para>
<indexterm zone="ch-system-openssh ssh"><primary sortas="b-ssh">ssh</primary></indexterm>
</listitem>
</varlistentry>

<varlistentry id="sshd">
<term><command>ssh</command></term>
<listitem>
<para>The daemon that listens for ssh login requests</para>
<indexterm zone="ch-system-openssh sshd"><primary sortas="b-ssh">sshd</primary></indexterm>
</listitem>
</varlistentry>

<varlistentry id="ssh-agent">
<term><command>ssh-agent</command></term>
<listitem>
<para>An authentication agent that can store private keys</para>
<indexterm zone="ch-system-openssh ssh-agent"><primary sortas="b-ssh-agent">ssh-agent</primary></indexterm>
</listitem>
</varlistentry>

<varlistentry id="ssh-add">
<term><command>ssh-add</command></term>
<listitem>
<para>Tool which adds keys to the ssh-agent</para>
<indexterm zone="ch-system-openssh ssh-add"><primary sortas="b-ssh-add">ssh-add</primary></indexterm>
</listitem>
</varlistentry>

<varlistentry id="sftp">
<term><command>sftp</command></term>
<listitem>
<para>FTP-like program that works over SSH1 and SSH2 protocols</para>
<indexterm zone="ch-system-openssh sftp"><primary sortas="b-sftp">sftp</primary></indexterm>
</listitem>
</varlistentry>

<varlistentry id="scp">
<term><command>scp</command></term>
<listitem>
<para>File copy program that acts like rcp</para>
<indexterm zone="ch-system-openssh scp"><primary sortas="b-scp">scp</primary></indexterm>
</listitem>
</varlistentry>

<varlistentry id="ssh-keygen">
<term><command>ssh-keygen</command></term>
<listitem>
<para>Key generation tool</para>
<indexterm zone="ch-system-openssh ssh-keygen"><primary sortas="b-ssh-keygen">ssh-keygen</primary></indexterm>
</listitem>
</varlistentry>

<varlistentry id="sftp-server">
<term><command>sftp-server</command></term>
<listitem>
<para>SFTP server subsystem</para>
<indexterm zone="ch-system-openssh sftp-server"><primary sortas="b-sftp-server">sftp-server</primary></indexterm>
</listitem>
</varlistentry>

<varlistentry id="ssh-keyscan">
<term><command>ssh-keyscan</command></term>
<listitem>
<para>Utility for gathering public host keys from a number of hosts</para>
<indexterm zone="ch-system-openssh ssh-keyscan"><primary sortas="b-ssh-keyscan">ssh-keyscan</primary></indexterm>
</listitem>
</varlistentry>

</variablelist>

</sect2>

</sect1>