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<h1>WebDAV with nginx</h1>
<span class="meta">Posted by
<a href="https://captainark.net/author/antoine-joubert.html">Antoine Joubert</a>
on Sat 26 March 2016
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<p>This website has been hosted on an <a href="https://www.online.net">Online.net</a> dedicated server since its creation. I've been one of their customers for the past 3 years now, and I still don't have anything bad to say about them.</p>
<p>They recently upgraded their personnal range, and I took the opportunity to upgrade from a single server running all of my services to 2 servers running LXC containers that are hosting my services.</p>
<p>It took me 2 days to migrate everything, but it was worth it. If I decide to switch servers again, I'll have to migrate the containers instead of the services themselves. Considering they are stored on a separate BTRFS volume, it shouldn't take me more than a few hours at most.</p>
<p>During the migration, I realized that I needed to make files that were hosted on one server accessible to the other. I could have gone with CIFS or NFS, but I wanted to have encryption built-in instead of having to rely on a VPN for that. Since I figured it was a good opportunity to learn something new, I ended up going with WebDAV.</p>
<p>In this tutorial, I'll explain how I've configured a read-only WebDAV share using <a href="https://www.nginx.com/">nginx</a> and <a href="https://letsencrypt.org/">Let'sEncrypt</a> SSL certificates between two Debian Jessie containers.</p>
<h2>Server configuration</h2>
<h3>Installing the required packages</h3>
<p>First thing first, we need to install the packages we'll need for this configuration :</p>
<div class="highlight"><pre><span></span>apt update
apt -t jessie-backports install nginx letsencrypt
apt install apache2-utils
</pre></div>
<h3>Getting our first certificate from letsencrypt</h3>
<h4>letsencrypt configuration</h4>
<p>Let's create a configuration file for letsencrypt :</p>
<div class="highlight"><pre><span></span>mkdir /etc/letsencrypt
<span class="nb">echo</span> <span class="s1">&#39;rsa-key-size = 3072</span>
<span class="s1">renew-by-default</span>
<span class="s1">text = True</span>
<span class="s1">agree-tos = True</span>
<span class="s1">renew-by-default = True</span>
<span class="s1">authenticator = webroot</span>
<span class="s1">email = admin@example.com</span>
<span class="s1">webroot-path = /var/www/letsencrypt/&#39;</span> &gt; /etc/letsencrypt/cli.ini
</pre></div>
<p><em>Please do modify admin@example.com by your actual e-mail address.</em></p>
<p>We also need to create the directory structure where letsencrypt ACME challenge temporary files will be stored :</p>
<div class="highlight"><pre><span></span>mkdir -p /var/www/letsencrypt/.well-known
</pre></div>
<h4>nginx configuration</h4>
<p>We now need to configure nginx by adding the following in the <code>/etc/nginx/sites-available/default</code> file, anywhere in the <code>server{}</code> block that is configured to listen on port 80.</p>
<div class="highlight"><pre><span></span>location /.well-known/acme-challenge {
root /var/www/letsencrypt;
}
</pre></div>
<p>Let's make sure that we haven't done anything wrong :</p>
<div class="highlight"><pre><span></span>nginx -t
</pre></div>
<p>The command should give you the following output :</p>
<div class="highlight"><pre><span></span><span class="n">nginx</span><span class="o">:</span> <span class="n">the</span> <span class="n">configuration</span> <span class="n">file</span> <span class="sr">/etc/nginx/</span><span class="n">nginx</span><span class="o">.</span><span class="na">conf</span> <span class="n">syntax</span> <span class="k">is</span> <span class="n">ok</span>
<span class="n">nginx</span><span class="o">:</span> <span class="n">configuration</span> <span class="n">file</span> <span class="sr">/etc/nginx/</span><span class="n">nginx</span><span class="o">.</span><span class="na">conf</span> <span class="n">test</span> <span class="k">is</span> <span class="n">successful</span>
</pre></div>
<p>If that's the case, you can safely reload the nginx daemon :</p>
<div class="highlight"><pre><span></span>nginx -s reload
</pre></div>
<h4>Certificate request</h4>
<p>Now that letsencrypt and nginx are properly configured, we can request our certificate from letsencrypt :</p>
<div class="highlight"><pre><span></span>letsencrypt --config /etc/letsencrypt/cli.ini certonly -w /var/www/letsencrypt -d www.example.com
</pre></div>
<p><em>Please do modify www.example.com by your server's FQDN, and please note that the letsencrypt servers need to be able to resolve that name to your server's IP.</em></p>
<p>If everything goes well, your certificates will be generated and stored in the /etc/letsencrypt folder.</p>
<h3>WebDAV configuration</h3>
<p>Now that we've obtained our certificate from letsencrypt, we can begin configuring nginx.</p>
<p>First, we need to comment two SSL directives from the default nginx configuration :</p>
<div class="highlight"><pre><span></span>sed -i &#39;/ssl_/ s/^/#/&#39; /etc/nginx/nginx.conf
</pre></div>
<p>Let's now create a <code>/etc/nginx/conf.d/ssl.conf</code> with the following content :</p>
<div class="highlight"><pre><span></span><span class="nt">ssl_session_timeout</span> <span class="nt">1d</span><span class="o">;</span>
<span class="nt">ssl_session_cache</span> <span class="nt">shared</span><span class="nd">:SSL:50m</span><span class="o">;</span>
<span class="nt">ssl_session_tickets</span> <span class="nt">off</span><span class="o">;</span>
<span class="nt">ssl_certificate</span> <span class="o">/</span><span class="nt">etc</span><span class="o">/</span><span class="nt">letsencrypt</span><span class="o">/</span><span class="nt">live</span><span class="o">/</span><span class="nt">www</span><span class="nc">.example.com</span><span class="o">/</span><span class="nt">fullchain</span><span class="nc">.pem</span><span class="o">;</span>
<span class="nt">ssl_certificate_key</span> <span class="o">/</span><span class="nt">etc</span><span class="o">/</span><span class="nt">letsencrypt</span><span class="o">/</span><span class="nt">live</span><span class="o">/</span><span class="nt">www</span><span class="nc">.example.com</span><span class="o">/</span><span class="nt">privkey</span><span class="nc">.pem</span><span class="o">;</span>
<span class="nt">ssl_trusted_certificate</span> <span class="o">/</span><span class="nt">etc</span><span class="o">/</span><span class="nt">letsencrypt</span><span class="o">/</span><span class="nt">live</span><span class="o">/</span><span class="nt">www</span><span class="nc">.example.com</span><span class="o">/</span><span class="nt">fullchain</span><span class="nc">.pem</span><span class="o">;</span>
<span class="nt">ssl_dhparam</span> <span class="o">/</span><span class="nt">etc</span><span class="o">/</span><span class="nt">nginx</span><span class="o">/</span><span class="nt">ssl</span><span class="o">/</span><span class="nt">dhparam</span><span class="nc">.pem</span><span class="o">;</span>
<span class="nt">ssl_protocols</span> <span class="nt">TLSv1</span> <span class="nt">TLSv1</span><span class="nc">.1</span> <span class="nt">TLSv1</span><span class="nc">.2</span><span class="o">;</span>
<span class="nt">ssl_ciphers</span> <span class="s1">&#39;ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS&#39;</span><span class="o">;</span>
<span class="nt">ssl_prefer_server_ciphers</span> <span class="nt">on</span><span class="o">;</span>
<span class="nt">add_header</span> <span class="nt">Strict-Transport-Security</span> <span class="nt">max-age</span><span class="o">=</span><span class="nt">15768000</span><span class="o">;</span>
<span class="nt">add_header</span> <span class="nt">X-Frame-Options</span> <span class="nt">DENY</span><span class="o">;</span>
<span class="nt">add_header</span> <span class="nt">X-Content-Type-Options</span> <span class="nt">nosniff</span><span class="o">;</span>
<span class="nt">ssl_stapling</span> <span class="nt">on</span><span class="o">;</span>
<span class="nt">ssl_stapling_verify</span> <span class="nt">on</span><span class="o">;</span>
<span class="nt">resolver</span> <span class="nt">127</span><span class="nc">.0.0.1</span> <span class="nt">valid</span><span class="o">=</span><span class="nt">300s</span><span class="o">;</span>
<span class="nt">resolver_timeout</span> <span class="nt">5s</span><span class="o">;</span>
</pre></div>
<p><em>This configuration will work if you're using a single certificate on your server. If not, you'll have to remove the <code>ssl_certificate</code>, <code>ssl_certificate_key</code> and <code>ssl_trusted_certificate</code> directives from this file and move them to the correct <code>server{}</code> block.</em></p>
<p>We now need to generate a <code>dhparam.pem</code> file :</p>
<div class="highlight"><pre><span></span>mkdir /etc/nginx/ssl <span class="o">&amp;&amp;</span> chmod <span class="m">700</span> /etc/nginx/ssl
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 3072
chmod <span class="m">600</span> /etc/nginx/ssl/dhparam.pem
</pre></div>
<p>Let's now generate a HTTP basic authentication file. This example creates a user named example :</p>
<div class="highlight"><pre><span></span>mkdir /etc/nginx/auth
htpasswd -c /etc/nginx/auth/webdav example
New password:
Re-type new password:
Adding password for user user
</pre></div>
<p>This file has to be readable by the user running your webserver. For security reasons, we'll make it readable only by him :</p>
<div class="highlight"><pre><span></span>chown -R www-data:nogroup /etc/nginx/auth
chmod 700 /etc/nginx/auth
chmod 400 /etc/nginx/auth/webdav
</pre></div>
<p>Let's now modify our <code>/etc/nginx/sites-available/default</code> file with the following content :</p>
<div class="highlight"><pre><span></span>server {
listen 80 default_server;
listen [::]:80 default_server ipv6only=on;
server_name &quot;&quot;;
return 444;
}
server {
listen 443 default_server ssl http2;
listen [::]:443 default_server ipv6only=on ssl http2;
server_name &quot;&quot;;
return 444;
}
</pre></div>
<p>We now have to create a <code>/etc/nginx/sites-available/example</code> file that will contain our actual webdav configuration. This example makes a <code>data</code> folder stored in <code>/var/www/</code> accessible.</p>
<div class="highlight"><pre><span></span><span class="nt">server</span> <span class="p">{</span>
<span class="n">listen</span> <span class="m">80</span><span class="p">;</span>
<span class="n">listen</span> <span class="cp">[</span><span class="p">::</span><span class="cp">]</span><span class="o">:</span><span class="m">80</span><span class="p">;</span>
<span class="n">server_name</span> <span class="n">www</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span><span class="p">;</span>
<span class="n">return</span> <span class="m">301</span> <span class="n">https</span><span class="o">://</span><span class="err">$</span><span class="n">server_name</span><span class="err">$</span><span class="n">request_uri</span><span class="p">;</span>
<span class="p">}</span>
<span class="nt">server</span> <span class="p">{</span>
<span class="n">listen</span> <span class="m">443</span> <span class="n">ssl</span> <span class="n">http2</span><span class="p">;</span>
<span class="n">listen</span> <span class="cp">[</span><span class="p">::</span><span class="cp">]</span><span class="o">:</span><span class="m">443</span> <span class="n">ssl</span> <span class="n">http2</span><span class="p">;</span>
<span class="n">server_name</span> <span class="n">www</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span><span class="p">;</span>
<span class="n">root</span> <span class="o">/</span><span class="n">var</span><span class="o">/</span><span class="n">www</span><span class="p">;</span>
<span class="n">location</span> <span class="o">/</span> <span class="err">{</span>
<span class="n">index</span> <span class="n">index</span><span class="o">.</span><span class="n">html</span><span class="p">;</span>
<span class="p">}</span>
<span class="nt">location</span> <span class="o">/</span><span class="nc">.well-known</span><span class="o">/</span><span class="nt">acme-challenge</span> <span class="p">{</span>
<span class="n">root</span> <span class="o">/</span><span class="n">var</span><span class="o">/</span><span class="n">www</span><span class="o">/</span><span class="n">letsencrypt</span><span class="p">;</span>
<span class="p">}</span>
<span class="nt">location</span> <span class="o">/</span><span class="nt">data</span> <span class="p">{</span>
<span class="n">client_body_temp_path</span> <span class="o">/</span><span class="n">tmp</span><span class="p">;</span>
<span class="n">dav_methods</span> <span class="n">PUT</span> <span class="n">DELETE</span> <span class="n">MKCOL</span> <span class="n">COPY</span> <span class="n">MOVE</span><span class="p">;</span>
<span class="n">dav_ext_methods</span> <span class="n">PROPFIND</span> <span class="n">OPTIONS</span><span class="p">;</span>
<span class="n">create_full_put_path</span> <span class="n">on</span><span class="p">;</span>
<span class="n">dav_access</span> <span class="n">user</span><span class="o">:</span><span class="n">r</span> <span class="n">group</span><span class="o">:</span><span class="n">r</span><span class="p">;</span>
<span class="n">auth_basic</span> <span class="s2">&quot;Restricted access&quot;</span><span class="p">;</span>
<span class="n">auth_basic_user_file</span> <span class="n">auth</span><span class="o">/</span><span class="n">webdav</span><span class="p">;</span>
<span class="n">limit_except</span> <span class="n">GET</span> <span class="err">{</span>
<span class="n">allow</span> <span class="o">&lt;</span><span class="n">YOUR</span> <span class="n">IP</span> <span class="n">HERE</span><span class="o">&gt;</span><span class="p">;</span>
<span class="n">deny</span> <span class="n">all</span><span class="p">;</span>
<span class="p">}</span>
<span class="err">}</span>
<span class="err">}</span>
</pre></div>
<p>The last thing we have to do is to create a symlink so that nginx will load our configuration :</p>
<div class="highlight"><pre><span></span>ln -s /etc/nginx/sites-available/example /etc/nginx/sites-enabled/example
</pre></div>
<p>Like before, let's make sure our configuration is correct and then reload the daemon :</p>
<div class="highlight"><pre><span></span>nginx -t
nginx -s reload
</pre></div>
<p>That's it for the WebDAV configuration server-side !</p>
<h3>nginx monitoring</h3>
<p>If you're using monit, you can easily monitor the nginx daemon by copying the following in <code>/etc/monit/conf.d/nginx</code> :</p>
<div class="highlight"><pre><span></span>check process nginx
with pidfile &quot;/run/nginx.pid&quot;
start program = &quot;/bin/systemctl start nginx&quot;
stop program = &quot;/bin/systemctl stop nginx&quot;
alert monit@example.com
</pre></div>
<h3>Certificates auto-renewal</h3>
<p>This goes beyond the scope of the article, but since letsencrypt certficates are only valid for 3 months, you'll need to renew them regularily. You can do so manually or you can setup a cron that does it for you.</p>
<p>I personnaly use the following script :</p>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17</pre></div></td><td class="code"><div class="highlight"><pre><span></span><span class="ch">#!/bin/bash</span>
<span class="nv">PRG</span><span class="o">=</span><span class="s2">&quot;/usr/bin/letsencrypt&quot;</span>
<span class="nv">CONFIG</span><span class="o">=</span><span class="s2">&quot;/etc/letsencrypt/cli.ini&quot;</span>
<span class="nv">MAILDEST</span><span class="o">=</span><span class="s2">&quot;admin@example.com&quot;</span>
<span class="nv">GLOBAL</span><span class="o">=</span>0
<span class="c1"># www.example.com</span>
<span class="nv">$PRG</span> --config <span class="nv">$CONFIG</span> certonly -w /var/www/letsencrypt -d www.example.com
<span class="o">[[</span> <span class="nv">$?</span> !<span class="o">=</span> <span class="m">0</span> <span class="o">]]</span> <span class="o">&amp;&amp;</span> <span class="nv">GLOBAL</span><span class="o">=</span><span class="k">$((</span> <span class="nv">$GLOBAL</span> <span class="o">+</span> <span class="m">1</span> <span class="k">))</span>
<span class="k">if</span> <span class="o">[[</span> <span class="nv">$GLOBAL</span> <span class="o">==</span> <span class="m">0</span> <span class="o">]]</span><span class="p">;</span> <span class="k">then</span>
/usr/sbin/nginx -s reload
<span class="k">else</span>
<span class="nb">echo</span> <span class="s2">&quot;Something went wrong while renewing the certificates on </span><span class="k">$(</span>hostname -f<span class="k">)</span><span class="s2"></span>
<span class="s2"> Manual action needed.&quot;</span> <span class="p">|</span> mail -s <span class="s2">&quot;Letsencrypt error on </span><span class="k">$(</span>hostname -f<span class="k">)</span><span class="s2">&quot;</span> <span class="nv">$MAILDEST</span>
<span class="k">fi</span>
</pre></div>
</td></tr></table>
<p>You can add multiple domains in the script. As long as you add all 3 lines for each domain, it will not automatically reload nginx if one or more certificate could not be renewed and will send an e-mail to the address configured in the <code>MAILDEST</code> variable.</p>
<p>You can configure this script in the root user crontab using the <code>crontab -e</code> command :</p>
<div class="highlight"><pre><span></span>## LETSENCRYPT CERTIFICATE AUTORENEWAL
30 03 01 */2 * /root/bin/tlsrenew
</pre></div>
<p>This will run the script every two months, on the first day of the month, at 3:30 AM.</p>
<h2>Client configuration</h2>
<h3>Installing the required packages</h3>
<p>A single package is required to mount a webdav volume on Debian :</p>
<div class="highlight"><pre><span></span>apt update &amp;&amp; apt install davfs2
</pre></div>
<h3>Mounting the share manually</h3>
<p>If like me, you want to mount your webdav share in a LXC container, you'll first need to make sure that the following line is present in its configuration file :</p>
<div class="highlight"><pre><span></span>lxc.cgroup.devices.allow = c 10:229 rwm
</pre></div>
<p>You'll also need to create the <code>/dev/fuse</code> node in the container :</p>
<div class="highlight"><pre><span></span>mknod /dev/fuse c 10 229
</pre></div>
<p>In any case, we have to edit the <code>/etc/davfs2/secrets</code> file to add the mount point, username and password that will be used to mount the share :</p>
<div class="highlight"><pre><span></span>echo &#39;/data webdav notanactualpassword&#39; &gt;&gt; /etc/davfs2/secrets
</pre></div>
<p>Once that's done, we can mount our share with the following command :</p>
<div class="highlight"><pre><span></span>mount -t davfs https://www.example.com/data /data -o ro,dir_mode=750,file_mode=640,uid=root,gid=root
</pre></div>
<p>You might need to edit the parameters depending on which users you want to make the share available to.</p>
<h3>Mouting the share on boot</h3>
<p>A davfs volume can be mounted via the <code>/etc/fstab</code> file, but I decided to use monit instead so that the volume would be mounted again automatically should my WebDAV server reboot.</p>
<p>In order to do so, I first created a <code>davfs.txt</code> file in the <code>/var/www/data</code> folder on my WebDAV server :</p>
<div class="highlight"><pre><span></span>touch /var/www/data/davfs.txt
</pre></div>
<p>I then created the following <code>/root/bin/mount_davfs</code> script :</p>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre>1
2
3
4</pre></div></td><td class="code"><div class="highlight"><pre><span></span><span class="ch">#!/bin/bash</span>
mknod /dev/fuse c <span class="m">10</span> 229
mount -t davfs https://www.example.com/data /data -o ro,dir_mode<span class="o">=</span>750,file_mode<span class="o">=</span>640,uid<span class="o">=</span>root,gid<span class="o">=</span>root
</pre></div>
</td></tr></table>
<p>The last thing I did was create a <code>/etc/monit/conf.d/davfs</code> file with the following content :</p>
<div class="highlight"><pre><span></span>check file davfs with path /data/davfs.txt
alert monit@example.com
if does not exist then exec &quot;/root/bin/mount_davfs&quot;
</pre></div>
<p>That way, if monit notices that the <code>/data/davfs.txt</code> file becomes inaccessible for some reason, it will try remouting the share.</p>
<h2>Conclusion</h2>
<p>That's all ! Hopefully this has been useful to someone. Please do comment below if you have any question or if this has been helpful !</p>
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