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| -rw-r--r-- | man/systemd-ssh-proxy.xml | 116 |
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diff --git a/man/systemd-ssh-proxy.xml b/man/systemd-ssh-proxy.xml new file mode 100644 index 0000000..d9615ff --- /dev/null +++ b/man/systemd-ssh-proxy.xml @@ -0,0 +1,116 @@ +<?xml version='1.0'?> <!--*-nxml-*--> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" + "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd"> +<!-- SPDX-License-Identifier: LGPL-2.1-or-later --> + +<refentry id="systemd-ssh-proxy" + xmlns:xi="http://www.w3.org/2001/XInclude"> + + <refentryinfo> + <title>systemd-ssh-proxy</title> + <productname>systemd</productname> + </refentryinfo> + + <refmeta> + <refentrytitle>systemd-ssh-proxy</refentrytitle> + <manvolnum>1</manvolnum> + </refmeta> + + <refnamediv> + <refname>systemd-ssh-proxy</refname> + <refpurpose>SSH client plugin for connecting to <constant>AF_VSOCK</constant> and + <constant>AF_UNIX</constant> sockets</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <programlisting> +Host unix/* vsock/* + ProxyCommand /usr/lib/systemd/systemd-ssh-proxy %h %p + ProxyUseFdpass yes +</programlisting> + <cmdsynopsis> + <command>/usr/lib/systemd/systemd-ssh-proxy</command> <arg>ADDRESS</arg> <arg>PORT</arg> + </cmdsynopsis> + </refsynopsisdiv> + + + <refsect1> + <title>Description</title> + + <para><command>systemd-ssh-proxy</command> is a small "proxy" plugin for the <citerefentry + project="man-pages"><refentrytitle>ssh</refentrytitle><manvolnum>1</manvolnum></citerefentry> + tool that allows connecting to <constant>AF_UNIX</constant> and <constant>AF_VSOCK</constant> sockets. It + implements the interface defined by <filename>ssh</filename>'s <varname>ProxyCommand</varname> + configuration option. It's supposed to be used with an <citerefentry + project="man-pages"><refentrytitle>ssh_config</refentrytitle><manvolnum>5</manvolnum></citerefentry> + configuration fragment like the following:</para> + + <programlisting> +Host unix/* vsock/* + ProxyCommand /usr/lib/systemd/systemd-ssh-proxy %h %p + ProxyUseFdpass yes + CheckHostIP no + +Host .host + ProxyCommand /usr/lib/systemd/systemd-ssh-proxy unix/run/ssh-unix-local/socket %p + ProxyUseFdpass yes + CheckHostIP no +</programlisting> + + <para>A configuration fragment along these lines is by default installed into + <filename>/etc/ssh/ssh_config.d/20-systemd-ssh-proxy.conf.in</filename>.</para> + + <para>With this in place, SSH connections to host string <literal>unix/</literal> followed by an absolute + <constant>AF_UNIX</constant> file system path to a socket will be directed to the specified socket, which + must be of type <constant>SOCK_STREAM</constant>. Similar, SSH connections to <literal>vsock/</literal> + followed by an <constant>AF_VSOCK</constant> CID will result in an SSH connection made to that + CID. Moreover connecting to <literal>.host</literal> will connect to the local host via SSH, without + involving networking.</para> + + <para>This tool is supposed to be used together with + <citerefentry><refentrytitle>systemd-ssh-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry> + which when run inside a VM or container will bind SSH to suitable + addresses. <command>systemd-ssh-generator</command> is supposed to run in the container of VM guest, and + <command>systemd-ssh-proxy</command> is run on the host, in order to connect to the container or VM + guest.</para> + </refsect1> + + <refsect1> + <title>Exit status</title> + + <para>On success, 0 is returned, a non-zero failure code + otherwise.</para> + </refsect1> + + <refsect1> + <title>Examples</title> + + <example> + <title>Talk to a local VM with CID 4711</title> + + <programlisting>ssh vsock/4711</programlisting> + </example> + + <example> + <title>Talk to the local host via ssh</title> + + <programlisting>ssh .host</programlisting> + + <para>or equivalent:</para> + + <programlisting>ssh unix/run/ssh-unix-local/socket</programlisting> + </example> + </refsect1> + + <refsect1> + <title>See Also</title> + <para><simplelist type="inline"> + <member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member> + <member><citerefentry><refentrytitle>systemd-ssh-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> + <member><citerefentry project="man-pages"><refentrytitle>vsock</refentrytitle><manvolnum>7</manvolnum></citerefentry></member> + <member><citerefentry project="man-pages"><refentrytitle>unix</refentrytitle><manvolnum>7</manvolnum></citerefentry></member> + <member><citerefentry project="man-pages"><refentrytitle>ssh</refentrytitle><manvolnum>1</manvolnum></citerefentry></member> + <member><citerefentry project="man-pages"><refentrytitle>sshd</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> + </simplelist></para> + </refsect1> +</refentry> |