mirror of
https://github.com/Zeckmathederg/glfs.git
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5cd0959daa
git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@2592 af4574ff-66df-0310-9fd7-8a98e5e911e0
183 lines
7.0 KiB
XML
183 lines
7.0 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
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"http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../../general.ent">
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%general-entities;
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<!ENTITY openssh-download-http "http://sunsite.ualberta.ca/pub/OpenBSD/OpenSSH/portable/openssh-&openssh-version;.tar.gz">
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<!ENTITY openssh-download-ftp "ftp://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-&openssh-version;.tar.gz">
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<!ENTITY openssh-size "799 KB">
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<!ENTITY openssh-buildsize "37 MB">
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<!ENTITY openssh-time "0.49 SBU">
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]>
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<sect1 id="openssh" xreflabel="OpenSSH-&openssh-version;">
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<sect1info>
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<othername>$LastChangedBy$</othername>
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<date>$Date$</date>
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</sect1info>
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<?dbhtml filename="openssh.html"?>
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<title>Open<acronym>SSH</acronym>-&openssh-version;</title>
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<sect2>
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<title>Introduction to <application>Open<acronym>SSH</acronym></application></title>
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<para>The <application>Open<acronym>SSH</acronym></application> package
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contains <command>ssh</command> clients and the <command>sshd</command> daemon.
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This is useful for encrypting authentication and subsequent traffic over a network.</para>
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<sect3><title>Package information</title>
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<itemizedlist spacing='compact'>
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<listitem><para>Download (HTTP): <ulink url="&openssh-download-http;"/></para></listitem>
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<listitem><para>Download (FTP): <ulink url="&openssh-download-ftp;"/></para></listitem>
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<listitem><para>Download size: &openssh-size;</para></listitem>
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<listitem><para>Estimated Disk space required: &openssh-buildsize;</para></listitem>
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<listitem><para>Estimated build time: &openssh-time;</para></listitem></itemizedlist>
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</sect3>
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<sect3><title><application>Open<acronym>SSH</acronym></application> dependencies</title>
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<sect4><title>Required</title>
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<para><xref linkend="openssl"/></para></sect4>
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<sect4><title>Optional</title>
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<para>
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<xref linkend="Linux_PAM"/>,
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<xref linkend="tcpwrappers"/>,
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X (<xref linkend="xfree86"/> or <xref linkend="xorg"/>),
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<xref linkend="mitkrb"/> or <xref linkend="heimdal"/>, and
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<ulink url="http://www.opensc.org/">OpenSC</ulink>
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</para></sect4>
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</sect3>
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</sect2>
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<sect2>
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<title>Installation of <application>Open<acronym>SSH</acronym></application></title>
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<para><application>Open<acronym>SSH</acronym></application> runs as two
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processes when connecting to other
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computers. The first process is a privileged process and controls the
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issuance of privileges as necessary. The second process communicates
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with the network. Additional installation steps are necessary to set up
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the proper environment which are performed by the following
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commands:</para>
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<screen><userinput><command>mkdir /var/empty &&
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chown root:sys /var/empty &&
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groupadd sshd &&
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useradd -c 'sshd privsep' -d /var/empty -g sshd -s /bin/false sshd</command></userinput></screen>
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<para><application>OpenSSH</application> is very sensitive to changes in the
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linked <application>OpenSSL</application> libraries. If you recompile
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<application>OpenSSL</application>, <application>OpenSSH</application> may
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fail to startup. An alternative is to link against the static <application>OpenSSL</application>
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library. To link against the static library, execute the following command:</para>
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<screen><userinput><command>sed -i "s:-lcrypto:/usr/lib/libcrypto.a:g" configure</command></userinput></screen>
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<para>Install <application>Open<acronym>SSH</acronym></application> by running
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the following commands:</para>
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<screen><userinput><command>./configure --prefix=/usr --sysconfdir=/etc/ssh \
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--libexecdir=/usr/sbin --with-md5-passwords &&
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make &&
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make install</command></userinput></screen>
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</sect2>
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<sect2>
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<title>Command explanations</title>
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<para><parameter>--sysconfdir=/etc/ssh</parameter>: This prevents the
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configuration files from going to <filename class="directory">/usr/etc</filename>.</para>
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<para><parameter>--with-md5-passwords</parameter>: This is required
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if you made the changes recommended by the shadowpasswd_plus
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<acronym>LFS</acronym> hint on
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your <acronym>SSH</acronym> server when you installed the Shadow Password
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Suite or if you access a <acronym>SSH</acronym> server that authenticates by
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user passwords encrypted with md5. </para>
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<para><parameter>--libexecdir=/usr/sbin</parameter>:
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<application>Open<acronym>SSH</acronym></application> installs
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programs called by programs in <filename class="directory">/usr/libexec</filename>.
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<command>sftp-server</command> is a <command>sshd</command>
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utility and <command>ssh-askpass</command> is a <command>ssh-add</command>
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utility that is installed as a link to <command>X11-ssh-askpass</command>.
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Both of these should go in <filename class="directory">/usr/sbin</filename>
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not <filename class="directory">/usr/libexec</filename>.</para>
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</sect2>
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<sect2>
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<title>Configuring <application>Open<acronym>SSH</acronym></application></title>
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<sect3><title>Config files</title>
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<para><filename>/etc/ssh/ssh_config</filename>,
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<filename>/etc/ssh/sshd_config </filename></para>
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<para>There are no required changes in either of these files. However
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you may wish to view them to make changes for appropriate security to
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your system. Configuration information can be found in the man pages for
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<command>sshd</command>, <command>ssh</command> and <command>ssh-agent
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</command></para>
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</sect3>
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<sect3><title>sshd init.d script</title>
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<para>To start the SSH Server at boot, install the <filename>/etc/rc.d/init.d/sshd</filename>
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init script included in the <xref linkend="intro-important-bootscripts"/> package.</para>
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<screen><userinput><command>make install-sshd</command></userinput></screen>
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</sect3>
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</sect2>
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<sect2>
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<title>Contents</title>
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<para>The <application>Open<acronym>SSH</acronym></application> package contains <command>ssh</command>,
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<command>sshd</command>, <command>ssh-agent</command>,
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<command>ssh-add</command>, <command>sftp</command>,
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<command>scp</command>, <command>ssh-keygen</command>,
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<command>sftp-server</command> and
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<command>ssh-keyscan</command>.</para>
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</sect2>
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<sect2><title>Description</title>
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<sect3><title>ssh</title>
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<para>The basic rlogin/rsh-like client program.</para></sect3>
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<sect3><title>sshd</title>
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<para>The daemon that listens for ssh login requests.</para></sect3>
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<sect3><title>ssh-agent</title>
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<para>An authentication agent that can store private keys.</para></sect3>
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<sect3><title>ssh-add</title>
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<para>Tool which adds keys to the <command>ssh-agent</command>.</para></sect3>
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<sect3><title>sftp</title>
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<para><acronym>FTP</acronym>-like program that works over
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<acronym>SSH</acronym>1 and <acronym>SSH</acronym>2 protocols.</para></sect3>
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<sect3><title>scp</title>
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<para>File copy program that acts like rcp.</para></sect3>
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<sect3><title>ssh-keygen</title>
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<para>Key generation tool.</para></sect3>
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<sect3><title>sftp-server</title>
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<para><acronym>SFTP</acronym> server subsystem.</para></sect3>
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<sect3><title>ssh-keyscan</title>
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<para>Utility for gathering public host keys from a number of hosts.</para></sect3>
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</sect2>
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</sect1>
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