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  • Committer: Teddy Hogeborn
  • Date: 2017-08-20 14:14:14 UTC
  • Revision ID: teddy@recompile.se-20170820141414-m034xuebg7ccaeui
Add some more restrictions to the systemd service file.

* mandos.service ([Service]/ProtectKernelTunables): New; set to "yes".
  ([Service]/ProtectControlGroups): - '' -

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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY TIMESTAMP "2011-08-08">
 
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<!ENTITY TIMESTAMP "2017-02-23">
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<!ENTITY % common SYSTEM "common.ent">
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%common;
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]>
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        <firstname>Björn</firstname>
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        <surname>Påhlsson</surname>
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        <address>
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          <email>belorn@fukt.bsnet.se</email>
 
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          <email>belorn@recompile.se</email>
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        </address>
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      </author>
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      <author>
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        <firstname>Teddy</firstname>
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        <surname>Hogeborn</surname>
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        <address>
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          <email>teddy@fukt.bsnet.se</email>
 
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          <email>teddy@recompile.se</email>
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        </address>
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      </author>
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    </authorgroup>
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    <copyright>
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      <year>2011</year>
 
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      <year>2012</year>
 
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      <year>2013</year>
 
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      <year>2014</year>
 
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      <year>2015</year>
 
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      <year>2016</year>
 
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      <year>2017</year>
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      <holder>Teddy Hogeborn</holder>
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      <holder>Björn Påhlsson</holder>
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    </copyright>
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  <refsect1 id="introduction">
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    <title>INTRODUCTION</title>
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    <para>
 
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      <!-- This paragraph is a combination and paraphrase of two
 
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           quotes from the 1995 movie “The Usual Suspects”. -->
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      You know how it is.  You’ve heard of it happening.  The Man
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      comes and takes away your servers, your friends’ servers, the
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      servers of everybody in the same hosting facility. The servers
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      </para>
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    </refsect2>
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    <refsect2 id="sniff">
 
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      <title>How about sniffing the network traffic and decrypting it
 
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      later by physically grabbing the Mandos client and using its
 
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      key?</title>
 
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      <para>
 
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        We only use <acronym>PFS</acronym> (Perfect Forward Security)
 
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        key exchange algorithms in TLS, which protects against this.
 
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      </para>
 
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    </refsect2>
 
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    <refsect2 id="physgrab">
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      <title>Physically grabbing the Mandos server computer?</title>
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      <para>
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      </para>
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    </refsect2>
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    <refsect2 id="fakeping">
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      <title>Faking ping replies?</title>
 
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    <refsect2 id="fakecheck">
 
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      <title>Faking checker results?</title>
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      <para>
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        The default for the server is to use
 
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        If the Mandos client does not have an SSH server, the default
 
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        is for the Mandos server to use
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        <quote><literal>fping</literal></quote>, the replies to which
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        could be faked to eliminate the timeout.  But this could
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        easily be changed to any shell command, with any security
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        measures you like.  It could, for instance, be changed to an
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        SSH command with strict keychecking, which could not be faked.
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        Or IPsec could be used for the ping packets, making them
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        secure.
 
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        measures you like.  If the Mandos client
 
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        <emphasis>has</emphasis> an SSH server, the default
 
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        configuration (as generated by
 
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        <command>mandos-keygen</command> with the
 
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        <option>--password</option> option) is for the Mandos server
 
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        to use an <command>ssh-keyscan</command> command with strict
 
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        keychecking, which can not be faked.  Alternatively, IPsec
 
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        could be used for the ping packets, making them secure.
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      </para>
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    </refsect2>
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  </refsect1>
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    </para>
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  </refsect1>
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  <refsect1 id="bugs">
 
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    <title>BUGS</title>
 
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    <xi:include href="bugs.xml"/>
 
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  </refsect1>
 
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  <refsect1 id="see_also">
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    <title>SEE ALSO</title>
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    <para>
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    <variablelist>
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      <varlistentry>
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        <term>
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          <ulink url="http://www.fukt.bsnet.se/mandos">Mandos</ulink>
 
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          <ulink url="https://www.recompile.se/mandos">Mandos</ulink>
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        </term>
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        <listitem>
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          <para>