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<h1 class=title>AppGate SDP on Arch Linux</h1>
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<span class=screen-reader-text>Posted on </span>
<time class=entry-date datetime=2020-03-16T22:00:15-04:00>2020, Mar 16</time>
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<div class="container entry-content"><p>AppGate SDP provides a Zero Trust network. This post describes how to get AppGate SDP <code>4.3.2</code> working on Arch Linux.</p>
<p>Depending on the AppGate SDP Server that is running, you may require a client that is more recent than the latest package on <a href=https://aur.archlinux.org/packages/appgate-sdp/>AUR</a>.
As of right now, the latest AUR is <code>4.2.2-1</code>.</p>
<p>These steps highlight how to get it working with <code>Python3.8</code> by making a 1 line modification to AppGate source code.</p>
<h1 id=packaging>Packaging</h1>
<p>We already know the community package is currently out of date, so let&rsquo;s clone it:</p>
<div class=highlight><pre tabindex=0 style=background-color:#f0f3f3;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-shell data-lang=shell>git clone https://aur.archlinux.org/appgate-sdp.git
<span style=color:#366>cd</span> appgate-sdp
</code></pre></div><p>You&rsquo;ll likely notice that the version is not what we want, so let&rsquo;s modify the <code>PKGBUILD</code> to the following:</p>
<div class=highlight><pre tabindex=0 style=background-color:#f0f3f3;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-shell data-lang=shell><span style=color:#09f;font-style:italic># Maintainer: Pawel Mosakowski &lt;pawel at mosakowski dot net&gt;</span>
<span style=color:#033>pkgname</span><span style=color:#555>=</span>appgate-sdp
<span style=color:#033>conflicts</span><span style=color:#555>=(</span><span style=color:#c30>&#39;appgate-sdp-headless&#39;</span><span style=color:#555>)</span>
<span style=color:#033>pkgver</span><span style=color:#555>=</span>4.3.2
<span style=color:#033>_download_pkgver</span><span style=color:#555>=</span>4.3
<span style=color:#033>pkgrel</span><span style=color:#555>=</span><span style=color:#f60>1</span>
<span style=color:#033>epoch</span><span style=color:#555>=</span>
<span style=color:#033>pkgdesc</span><span style=color:#555>=</span><span style=color:#c30>&#34;Software Defined Perimeter - GUI client&#34;</span>
<span style=color:#033>arch</span><span style=color:#555>=(</span><span style=color:#c30>&#39;x86_64&#39;</span><span style=color:#555>)</span>
<span style=color:#033>url</span><span style=color:#555>=</span><span style=color:#c30>&#34;https://www.cyxtera.com/essential-defense/appgate-sdp/support&#34;</span>
<span style=color:#033>license</span><span style=color:#555>=(</span><span style=color:#c30>&#39;custom&#39;</span><span style=color:#555>)</span>
<span style=color:#09f;font-style:italic># dependecies calculated by namcap</span>
<span style=color:#033>depends</span><span style=color:#555>=(</span><span style=color:#c30>&#39;gconf&#39;</span> <span style=color:#c30>&#39;libsecret&#39;</span> <span style=color:#c30>&#39;gtk3&#39;</span> <span style=color:#c30>&#39;python&#39;</span> <span style=color:#c30>&#39;nss&#39;</span> <span style=color:#c30>&#39;libxss&#39;</span> <span style=color:#c30>&#39;nodejs&#39;</span> <span style=color:#c30>&#39;dnsmasq&#39;</span><span style=color:#555>)</span>
<span style=color:#033>source</span><span style=color:#555>=(</span><span style=color:#c30>&#34;https://sdpdownloads.cyxtera.com/AppGate-SDP-</span><span style=color:#a00>${</span><span style=color:#033>_download_pkgver</span><span style=color:#a00>}</span><span style=color:#c30>/clients/</span><span style=color:#a00>${</span><span style=color:#033>pkgname</span><span style=color:#a00>}</span><span style=color:#c30>_</span><span style=color:#a00>${</span><span style=color:#033>pkgver</span><span style=color:#a00>}</span><span style=color:#c30>_amd64.deb&#34;</span>
<span style=color:#c30>&#34;appgatedriver.service&#34;</span><span style=color:#555>)</span>
<span style=color:#033>options</span><span style=color:#555>=(</span>staticlibs<span style=color:#555>)</span>
prepare<span style=color:#555>()</span> <span style=color:#555>{</span>
tar -xf data.tar.xz
<span style=color:#555>}</span>
package<span style=color:#555>()</span> <span style=color:#555>{</span>
cp -dpr <span style=color:#c30>&#34;</span><span style=color:#a00>${</span><span style=color:#033>srcdir</span><span style=color:#a00>}</span><span style=color:#c30>&#34;</span>/<span style=color:#555>{</span>etc,lib,opt,usr<span style=color:#555>}</span> <span style=color:#c30>&#34;</span><span style=color:#a00>${</span><span style=color:#033>pkgdir</span><span style=color:#a00>}</span><span style=color:#c30>&#34;</span>
mv -v <span style=color:#c30>&#34;</span><span style=color:#033>$pkgdir</span><span style=color:#c30>/lib/systemd/system&#34;</span> <span style=color:#c30>&#34;</span><span style=color:#033>$pkgdir</span><span style=color:#c30>/usr/lib/systemd/&#34;</span>
rm -vrf <span style=color:#c30>&#34;</span><span style=color:#033>$pkgdir</span><span style=color:#c30>/lib&#34;</span>
cp -v <span style=color:#c30>&#34;</span><span style=color:#033>$srcdir</span><span style=color:#c30>/appgatedriver.service&#34;</span> <span style=color:#c30>&#34;</span><span style=color:#033>$pkgdir</span><span style=color:#c30>/usr/lib/systemd/system/appgatedriver.service&#34;</span>
mkdir -vp <span style=color:#c30>&#34;</span><span style=color:#033>$pkgdir</span><span style=color:#c30>/usr/share/licenses/appgate-sdp&#34;</span>
cp -v <span style=color:#c30>&#34;</span><span style=color:#033>$pkgdir</span><span style=color:#c30>/usr/share/doc/appgate/copyright&#34;</span> <span style=color:#c30>&#34;</span><span style=color:#033>$pkgdir</span><span style=color:#c30>/usr/share/licenses/appgate-sdp&#34;</span>
cp -v <span style=color:#c30>&#34;</span><span style=color:#033>$pkgdir</span><span style=color:#c30>/usr/share/doc/appgate/LICENSE.github&#34;</span> <span style=color:#c30>&#34;</span><span style=color:#033>$pkgdir</span><span style=color:#c30>/usr/share/licenses/appgate-sdp&#34;</span>
cp -v <span style=color:#c30>&#34;</span><span style=color:#033>$pkgdir</span><span style=color:#c30>/usr/share/doc/appgate/LICENSES.chromium.html.bz2&#34;</span> <span style=color:#c30>&#34;</span><span style=color:#033>$pkgdir</span><span style=color:#c30>/usr/share/licenses/appgate-sdp&#34;</span>
<span style=color:#555>}</span>
<span style=color:#033>md5sums</span><span style=color:#555>=(</span><span style=color:#c30>&#39;17101aac7623c06d5fbb95f50cf3dbdc&#39;</span>
<span style=color:#c30>&#39;002644116e20b2d79fdb36b7677ab4cf&#39;</span><span style=color:#555>)</span>
</code></pre></div><p>Let&rsquo;s first make sure we have some dependencies. If you do not have <a href=https://github.com/Jguer/yay>yay</a>, check it out.</p>
<div class=highlight><pre tabindex=0 style=background-color:#f0f3f3;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-shell data-lang=shell>yay -S dnsmasq gconf
</code></pre></div><p>Now, let&rsquo;s install it:</p>
<div class=highlight><pre tabindex=0 style=background-color:#f0f3f3;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-shell data-lang=shell>makepkg -si
</code></pre></div><h1 id=running-the-client>Running the client</h1>
<p>Ok, let&rsquo;s run the client by executing <code>appgate</code>.</p>
<p>It complains about not being able to connect.</p>
<p>Easy fix:</p>
<div class=highlight><pre tabindex=0 style=background-color:#f0f3f3;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-shell data-lang=shell>sudo systemctl start appgatedriver.service
</code></pre></div><p>Now we should be connected&mldr; but DNS is not working?</p>
<h1 id=fixing-the-dns>Fixing the DNS</h1>
<p>Running <code>resolvectl</code> should display that something is not right.</p>
<p>Why is the DNS not being set by appgate?</p>
<div class=highlight><pre tabindex=0 style=background-color:#f0f3f3;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-shell data-lang=shell>$ head -3 /opt/appgate/linux/set_dns
<span style=color:#09f;font-style:italic>#!/usr/bin/env python3</span>
<span style=color:#c30>&#39;&#39;</span><span style=color:#a00;background-color:#faa>&#39;</span>
This is used to <span style=color:#366>set</span> and <span style=color:#366>unset</span> the DNS.
</code></pre></div><p>It seems like python3 is required for the DNS setting to happen.
Let&rsquo;s try to run it.</p>
<div class=highlight><pre tabindex=0 style=background-color:#f0f3f3;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-shell data-lang=shell>$ sudo /opt/appgate/linux/set_dns
/opt/appgate/linux/set_dns:88: SyntaxWarning: <span style=color:#c30>&#34;is&#34;</span> with a literal. Did you mean <span style=color:#c30>&#34;==&#34;</span>?
<span style=color:#033>servers</span> <span style=color:#555>=</span> <span style=color:#555>[(</span> socket.AF_INET <span style=color:#069;font-weight:700>if</span> x.version is <span style=color:#f60>4</span> <span style=color:#069;font-weight:700>else</span> socket.AF_INET6, map<span style=color:#555>(</span>int, x.packed<span style=color:#555>))</span> <span style=color:#069;font-weight:700>for</span> x in servers<span style=color:#555>]</span>
Traceback <span style=color:#555>(</span>most recent call last<span style=color:#555>)</span>:
File <span style=color:#c30>&#34;/opt/appgate/linux/set_dns&#34;</span>, line 30, in &lt;module&gt;
import dbus
ModuleNotFoundError: No module named <span style=color:#c30>&#39;dbus&#39;</span>
</code></pre></div><p>Ok, let&rsquo;s install it:</p>
<div class=highlight><pre tabindex=0 style=background-color:#f0f3f3;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-shell data-lang=shell>$ sudo python3.8 -m pip install dbus-python
</code></pre></div><p>Will it work now? Not yet. There&rsquo;s another issue:</p>
<div class=highlight><pre tabindex=0 style=background-color:#f0f3f3;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-shell data-lang=shell>$ sudo /opt/appgate/linux/set_dns
/opt/appgate/linux/set_dns:88: SyntaxWarning: <span style=color:#c30>&#34;is&#34;</span> with a literal. Did you mean <span style=color:#c30>&#34;==&#34;</span>?
<span style=color:#033>servers</span> <span style=color:#555>=</span> <span style=color:#555>[(</span> socket.AF_INET <span style=color:#069;font-weight:700>if</span> x.version is <span style=color:#f60>4</span> <span style=color:#069;font-weight:700>else</span> socket.AF_INET6, map<span style=color:#555>(</span>int, x.packed<span style=color:#555>))</span> <span style=color:#069;font-weight:700>for</span> x in servers<span style=color:#555>]</span>
module <span style=color:#c30>&#39;platform&#39;</span> has no attribute <span style=color:#c30>&#39;linux_distribution&#39;</span>
</code></pre></div><p>This is a breaking change in Python3.8.</p>
<p>So what is calling <code>platform.linux_distribution</code>?</p>
<p>Let&rsquo;s search for it:</p>
<div class=highlight><pre tabindex=0 style=background-color:#f0f3f3;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-shell data-lang=shell>$ sudo grep -r <span style=color:#c30>&#39;linux_distribution&#39;</span> /opt/appgate/linux/
/opt/appgate/linux/nm.py: <span style=color:#069;font-weight:700>if</span> platform.linux_distribution<span style=color:#555>()[</span>0<span style=color:#555>]</span> !<span style=color:#555>=</span> <span style=color:#c30>&#39;Fedora&#39;</span>:
</code></pre></div><p>Aha! So this is in the local AppGate source code. This should be an easy fix. Let&rsquo;s just replace this line with:</p>
<div class=highlight><pre tabindex=0 style=background-color:#f0f3f3;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-python data-lang=python><span style=color:#069;font-weight:700>if</span> <span style=color:#069;font-weight:700>True</span>: <span style=color:#09f;font-style:italic># Since we are not using Fedora :)</span>
</code></pre></div><h1 id=wrapping-up>Wrapping up</h1>
<p>It turns out there are <a href=https://docs.python.org/3.7/library/platform.html#platform.linux_distribution>breaking changes</a> in Python3.8.</p>
<p>The docs say <code>Deprecated since version 3.5, will be removed in version 3.8: See alternative like the distro package.</code></p>
<p>I suppose this highlights one of the caveats of relying upon the system&rsquo;s python, rather than having an isolated, dedicated environment for all dependencies.</p></div>
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