[0931098] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.3/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 "http://sunsite.ualberta.ca/pub/OpenBSD/OpenSSH/portable/openssh-&openssh-version;.tar.gz">
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| 8 | <!ENTITY openssh-download-ftp "ftp://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-&openssh-version;.tar.gz">
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| 9 | <!ENTITY openssh-size "799 KB">
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| 10 | <!ENTITY openssh-buildsize "37 MB">
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| 11 | <!ENTITY openssh-time "0.49 SBU">
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| 12 |
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| 13 | ]>
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| 14 |
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[1708d1e9] | 15 | <sect1 id="openssh" xreflabel="OpenSSH-&openssh-version;">
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[00bb024c] | 16 | <?dbhtml filename="openssh.html"?>
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[40330fcd] | 17 | <title>Open<acronym>SSH</acronym>-&openssh-version;</title>
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[f45b1953] | 18 |
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[0931098] | 19 | <sect2>
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| 20 | <title>Introduction to <application>Open<acronym>SSH</acronym></application></title>
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| 21 |
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| 22 | <para>The <application>Open<acronym>SSH</acronym></application> package
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| 23 | contains <command>ssh</command> clients and the <command>sshd</command> daemon.
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| 24 | This is useful for encrypting authentication and subsequent traffic over a network.</para>
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| 25 |
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| 26 | <sect3><title>Package information</title>
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| 27 | <itemizedlist spacing='compact'>
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| 28 | <listitem><para>Download (HTTP): <ulink url="&openssh-download-http;"/></para></listitem>
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| 29 | <listitem><para>Download (FTP): <ulink url="&openssh-download-ftp;"/></para></listitem>
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| 30 | <listitem><para>Download size: &openssh-size;</para></listitem>
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| 31 | <listitem><para>Estimated Disk space required: &openssh-buildsize;</para></listitem>
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| 32 | <listitem><para>Estimated build time: &openssh-time;</para></listitem></itemizedlist>
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| 33 | </sect3>
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| 34 |
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| 35 | <sect3><title><application>Open<acronym>SSH</acronym></application> dependencies</title>
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| 36 | <sect4><title>Required</title>
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| 37 | <para><xref linkend="openssl"/></para></sect4>
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| 38 | <sect4><title>Optional</title>
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| 39 | <para>
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| 40 | <xref linkend="Linux_PAM"/>,
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| 41 | <xref linkend="tcpwrappers"/>,
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| 42 | X (<xref linkend="xfree86"/> or <xref linkend="xorg"/>),
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| 43 | <xref linkend="mitkrb"/> or <xref linkend="heimdal"/>, and
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| 44 | <ulink url="http://www.opensc.org/">OpenSC</ulink>
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| 45 | </para></sect4>
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| 46 | </sect3>
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| 47 |
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| 48 | </sect2>
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| 49 |
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| 50 | <sect2>
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| 51 | <title>Installation of <application>Open<acronym>SSH</acronym></application></title>
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| 52 |
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| 53 | <para><application>Open<acronym>SSH</acronym></application> runs as two
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| 54 | processes when connecting to other
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| 55 | computers. The first process is a privileged process and controls the
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| 56 | issuance of privileges as necessary. The second process communicates
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| 57 | with the network. Additional installation steps are necessary to set up
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| 58 | the proper environment which are performed by the following
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| 59 | commands:</para>
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| 60 |
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| 61 | <screen><userinput><command>mkdir /var/empty &&
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| 62 | chown root:sys /var/empty &&
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| 63 | groupadd sshd &&
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| 64 | useradd -c 'sshd privsep' -d /var/empty -g sshd -s /bin/false sshd</command></userinput></screen>
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| 65 |
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| 66 | <para><application>OpenSSH</application> is very sensitive to changes in the
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| 67 | linked <application>OpenSSL</application> libraries. If you recompile
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| 68 | <application>OpenSSL</application>, <application>OpenSSH</application> may
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| 69 | fail to startup. An alternative is to link against the static <application>OpenSSL</application>
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| 70 | library. To link against the static library, execute the following command:</para>
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| 71 |
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| 72 | <screen><userinput><command>sed -i "s:-lcrypto:/usr/lib/libcrypto.a:g" configure</command></userinput></screen>
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| 73 |
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| 74 | <para>Install <application>Open<acronym>SSH</acronym></application> by running
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| 75 | the following commands:</para>
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| 76 |
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| 77 | <screen><userinput><command>./configure --prefix=/usr --sysconfdir=/etc/ssh \
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| 78 | --libexecdir=/usr/sbin --with-md5-passwords &&
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| 79 | make &&
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| 80 | make install</command></userinput></screen>
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| 81 |
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| 82 | </sect2>
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| 83 |
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| 84 | <sect2>
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| 85 | <title>Command explanations</title>
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| 86 |
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| 87 | <para><parameter>--sysconfdir=/etc/ssh</parameter>: This prevents the
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| 88 | configuration files from going to <filename class="directory">/usr/etc</filename>.</para>
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| 89 |
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| 90 | <para><parameter>--with-md5-passwords</parameter>: This is required
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| 91 | if you made the changes recommended by the shadowpasswd_plus
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| 92 | <acronym>LFS</acronym> hint on
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| 93 | your <acronym>SSH</acronym> server when you installed the Shadow Password
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| 94 | Suite or if you access a <acronym>SSH</acronym> server that authenticates by
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| 95 | user passwords encrypted with md5. </para>
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| 96 |
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| 97 | <para><parameter>--libexecdir=/usr/sbin</parameter>:
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| 98 | <application>Open<acronym>SSH</acronym></application> installs
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| 99 | programs called by programs in <filename class="directory">/usr/libexec</filename>.
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| 100 | <command>sftp-server</command> is a <command>sshd</command>
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| 101 | utility and <command>ssh-askpass</command> is a <command>ssh-add</command>
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| 102 | utility that is installed as a link to <command>X11-ssh-askpass</command>.
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| 103 | Both of these should go in <filename class="directory">/usr/sbin</filename>
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| 104 | not <filename class="directory">/usr/libexec</filename>.</para>
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| 105 |
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| 106 | </sect2>
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| 107 |
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| 108 | <sect2>
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| 109 | <title>Configuring <application>Open<acronym>SSH</acronym></application></title>
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| 110 |
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| 111 | <sect3><title>Config files</title>
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| 112 |
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| 113 | <para><filename>/etc/ssh/ssh_config</filename>,
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| 114 | <filename>/etc/ssh/sshd_config </filename></para>
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| 115 | <para>There are no required changes in either of these files. However
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| 116 | you may wish to view them to make changes for appropriate security to
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| 117 | your system. Configuration information can be found in the man pages for
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| 118 | <command>sshd</command>, <command>ssh</command> and <command>ssh-agent
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| 119 | </command></para>
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| 120 | </sect3>
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| 121 |
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| 122 | <sect3><title>sshd init.d script</title>
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| 123 |
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| 124 | <para>To start the SSH Server at boot, install the <filename>/etc/rc.d/init.d/sshd</filename>
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| 125 | init script included in the <xref linkend="intro-important-bootscripts"/> package.</para>
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| 126 |
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| 127 | <screen><userinput><command>make install-sshd</command></userinput></screen>
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| 128 |
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| 129 | </sect3>
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| 130 |
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| 131 | </sect2>
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| 132 |
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| 133 | <sect2>
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| 134 | <title>Contents</title>
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| 135 |
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| 136 | <para>The <application>Open<acronym>SSH</acronym></application> package contains <command>ssh</command>,
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| 137 | <command>sshd</command>, <command>ssh-agent</command>,
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| 138 | <command>ssh-add</command>, <command>sftp</command>,
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| 139 | <command>scp</command>, <command>ssh-keygen</command>,
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| 140 | <command>sftp-server</command> and
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| 141 | <command>ssh-keyscan</command>.</para>
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| 142 |
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| 143 | </sect2>
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| 144 |
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| 145 | <sect2><title>Description</title>
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| 146 |
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| 147 | <sect3><title>ssh</title>
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| 148 | <para>The basic rlogin/rsh-like client program.</para></sect3>
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| 149 |
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| 150 | <sect3><title>sshd</title>
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| 151 | <para>The daemon that listens for ssh login requests.</para></sect3>
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| 152 |
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| 153 | <sect3><title>ssh-agent</title>
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| 154 | <para>An authentication agent that can store private keys.</para></sect3>
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| 155 |
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| 156 | <sect3><title>ssh-add</title>
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| 157 | <para>Tool which adds keys to the <command>ssh-agent</command>.</para></sect3>
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| 158 |
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| 159 | <sect3><title>sftp</title>
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| 160 | <para><acronym>FTP</acronym>-like program that works over
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| 161 | <acronym>SSH</acronym>1 and <acronym>SSH</acronym>2 protocols.</para></sect3>
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| 162 |
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| 163 | <sect3><title>scp</title>
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| 164 | <para>File copy program that acts like rcp.</para></sect3>
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| 165 |
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| 166 | <sect3><title>ssh-keygen</title>
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| 167 | <para>Key generation tool.</para></sect3>
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| 168 |
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| 169 | <sect3><title>sftp-server</title>
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| 170 | <para><acronym>SFTP</acronym> server subsystem.</para></sect3>
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| 171 |
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| 172 | <sect3><title>ssh-keyscan</title>
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| 173 | <para>Utility for gathering public host keys from a number of hosts.</para></sect3>
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| 174 |
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| 175 | </sect2>
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[f45b1953] | 176 |
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| 177 | </sect1>
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| 178 |
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