LetsEncrypt

Using the Qualys FreeScan Scanner to test your website for online vulnerabilities

March 23, 2018 by Simon

It is possible to deploy a server in minutes to hours but it can take days to secure. What tools can you use to help identify what to secure on your website?

I have a number of guides on moving hasting away form CPanel, Setting up VM’s on AWS, Vultr or Digital Ocean along with installing and managing WordPress from the command line, installing a Free SSL certificate and setting up SSL security.

Security Tools

https://asafaweb.com/ is a good tool for quick scanning
Kali Linux has a number of security tools you can use.
You can run a system audit Lynis Audit.
Checking your site for vulnerabilities with Zap.
Run a Gravity Scan malware and supply chain scan
Use Qualys SSL scan to test your SSL certificate: https://www.ssllabs.com/ssltest/

Qualys SSL Labs SSL Tester is the best tool for checking an SSL certificate strength

Most people don’t know Qualys also has another free (limited to 10 scans) vulnerability scanner for websites.

Goto https://freescan.qualys.com/ and click Start your free account.

Complete the signup form

Now check your email to login and confirm your email account

Login now from the email.

Create a password (why the 25 char max Qualys?)

Enter your website URL and click Scan

The scan can take hours

While the scan was being performed I noticed that Qualys offers alerts (I’ll check this out later): https://www.qualys.com/research/security-alerts/

Yes, the scan can take hours, take a walk or read other posts here.

The scan is almost complete

Yay, my latest scan revealed 0 High, 0 Medium and 0 Low-risk vulnerabilities.

It did report 23 informational alerts like “Firewall Detected“.

Threat Report Results

Patch Report Results

This report was empty (probably because I don’t run Windows)

Threat Report Results

The OWASP report contained partial scan results (maybe the full report is available to pro users)

Previous Scan Results

The Qualys dashboard will show all past scans.

My first scan showed a Low priority issue with the /wp-login.php page as the input fields did not have “autocomplete=”off””, I fixed this by adding “autocomplete=”off”” the removing the page (safer).

The second scan found two issues with cookies (possibly ad banner cookies) and 2 subfolders that I created in past development exercises. I deleted the two sub-folders that were not needed.

The third scan was clean.

Here is a scan of a static website of a friends server (static can be less secure if the server underneath is old or unpatched).

Happy scanning. I hope this guide helps someone.

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Revision History

v1.1 Static Web Server Scan

v1.0 Initial post

Using OWASP ZAP GUI to scan your Applications for security issues

March 17, 2018 by Simon

OWASP is a non-profit that lists the Top Ten Most Critical Web Application Security Risks, they also have a GUI Java tool called OWASP Zap that you can use to check your apps for security issue.

I have a number of guides on moving hosting away form CPanel , Setting up VM’s on AWS, Vultr or Digital Ocean along with installing and managing WordPress from the command line. It is important that you always update your site and software and test your sites and software for vulnerabilities. Zap is free and completely open source.

Disclaimer, I am not an expert (this Zap post and my past Kali Linux guide will be updated as I learn more).

OWASP Top 10

OWASP has a top 10 list of things to review.

Download the OWASP 10 10 Application security risks PDF here form here.

Using the free OWASP Zap Tool

Snip from https://www.owasp.org/index.php/OWASP_Zed_Attack_Proxy_Project

“The OWASP Zed Attack Proxy (ZAP) is one of the world’s most popular free security tools and is actively maintained by hundreds of international volunteers*. It can help you automatically find security vulnerabilities in your web applications while you are developing and testing your applications. It’s also a great tool for experienced pentesters to use for manual security testing.”

Zap Overview

Here is a quick demo of Zap in action.

Do check out the official Zap videos on youtube: https://www.youtube.com/user/OWASPGLOBAL/videos if you want to learn more.

Installing Zap

Download Zap from here.

Download Options

Download contents

Copy to the app to the OSX Application folder

App Installed

Open OSX’s Privacy and Security screen and click Open Anyway

OWASP Zap is now Installed

Ready for a Scan

But before we do let’s check out the Options

OWASP Zap allows you to label reports to ad from anyone you want.

Now let’s update the program and plugins, Click Manage Add-ons

Click Update All to Update addons

I clicked Update All

Installed some plugins

Zap is Ready

Add a site and right click on the site and you can perform an active scan or port scan.

First Scan (https failed)

I enabled unsafe SSL/TLS Renegotiation.

This did not work and this guide said I needed to install the “Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files” from here.

The extract files to /Library/Java/JavaVirtualMachines/%your_jdk%/Contents/Home/jre/lib/security

I restarted OWASP Zap and tried to scan my site buy it appears Cloudflare (that I recently set up) was blocking my scans and reported error 403. I decided to scan another site of mine that was not on Cloudflare but had the same Lets Encrypt style SSL cert.

fyi: I own and set up the site I queried below.

OWASP Zap scan performed over 800 requests and tried traversal exploits and many other checks. Do repair any major failures you find.

Generating a Report

To generate a report click Report then the appropriate generation menu of choice.

FYI: The High Priority Alert is a false positive with an HTML item being mistaken for a CC number.

I hope this guide helps someone. Happy software/server hardening and good luck.

More Reading

Check out my Kali Linux guide.

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Revision History

V1.3 fixed hasting typo.

v1.2 False Positive

v1.1 updated main features

v1.0 Initial post

Setting up a website to use Cloudflare on a VM hosted on Vultr and Namecheap

March 13, 2018 by Simon

This guide will show how you can set up a website to use Cloudflare on a VM hosted on Vultr and Namecheap

I have a number of guides on moving hasting away form CPanel, Setting up VM’s on AWS, Vultr or Digital Ocean along with installing and managing WordPress from the command line. This post will show how to let Cloudflare handle the DNS for the domain.

Update 2018: For the best performing VM host (UpCloud) read my guide on the awesome UpCloud VM hosts (get $25 free credit by signing up here).

Snip from here “Cloudflare’s enterprise-class web application firewall (WAF) protects your Internet property from common vulnerabilities like SQL injection attacks, cross-site scripting, and cross-site forgery requests with no changes to your existing infrastructure.”

Buy a Domain

Buy a domain name from Namecheap here.

Cloudflare Benefits (Free Plan)

DDoS Attack Protection (Huge network to absorb attacks DDoS attacks over 600Gbps are no problem for our 15 Tbps networks)
Global CDN
Shared SSL certificate (I disabled this and opted to use my own)
Access to audit logs
3 page rules (maximum)

View paid plan options here.

Cloudflare CDN map

Cloudflare CDN says it can load assets up to 2x faster, 60% less bandwidth from your servers by delivering assets from 127 data centres.

Setup

You will need to sign up at cloudflare.com

After you create an account you will be prompted to add a siteCloudflare will pull your public DNS records to import.

You will be prompted to select a plan (I selected free)

Verify DNS settings to import.

You will now be asked to change your DNS nameservers with your domain reseller

TIP: If you have an SSL cert (e.g Lets Encrypt) already setup head to the crypto section and select ” Full (Strict)” to prevent ERR_TOO_MANY_REDIRECTS errors.

Cloudflare UI

I asked Twitter if they could kindly load my site so I could see if Cloudflare dashboard/stats were loading.

Could I kindly ask if you are reading this that you visit https://t.co/9x5TFARLCt, I am writing a @Cloudflare blog post and need to screenshot stats. Thanks in advance
— Simon Fearby (Developer) (@FearbySoftware) March 13, 2018

The Cloudflare CTO responded. 🙂

Sure thing 🙂
— John Graham-Cumming (@jgrahamc) March 13, 2018

Confirm Cloudflare link to a domain from the OSX Comand line

host -t NS fearby.com
fearby.com name server dane.ns.cloudflare.com.
fearby.com name server nora.ns.cloudflare.com.

Caching Rule

I set up the following caching rule to cache everything for 8 hours instead of WordPress pages

“fearby.com.com/wp-*” Cache level: Bypass
“fearby.com.com/wp-admin/post.php*” Cache level: Bypass
“fearby.com/*” Cache Everything, Edge Cache TTL: 8 Hours

Cache Results

Cache appears to be sitting at 50% after 12 hours. having cache os dynamic pages out there is ok unless I need to fix a typo, then I need to login to Cloudflare and clear the cache manually (or wait 8 hours)

Performance after a few hours

DNS times in gtmetrix have now fallen to a sub 200ms (Y Slow is now a respectable A, it was a C before). I just need to wait for caching and minification to kick in.

webpagetest.org results are awesome

See here: https://www.webpagetest.org/result/180314_PB_7660dfbe65d56b94a60d7a604ca250b3/

Load Time: 1.80s
First Byte 0.176s
Start Render 1.200s

Google Page Speed Insights Report

Mobile: 78/100

Desktop: 87/100

Check with https://developers.google.com/speed/pagespeed/insights/

Update 24th March 2018 Attacked?

I noticed a spike in and traffic (incoming and threats) on the 24th of March 2018.

I logged into Cloudflare on my mobile device and turned on Under Attack Mode.

Cloudflare was now adding a delay screen in the middle of my initial page load. Read more here. A few hours after the Attach started it was over.

After the Attack

I looked at the bandwidth and found no increase in traffic from my initial host VM. Nice.

Thanks, Cloudflare.

Cloudflare Pros

Enabling Attack mode was simple.
Soaked up an attack.
Free Tier
Many Reports
Option to force HTTPS over HTTP
Option to ban/challenge suspicious IP’s and set challenge timeframes.
Ability to setup IP firewall rules and Application Firewalls.
User-agent blocking
Lockdown URL’s to IP’s (pro feature)
Option to minify Javascript, CSS and HTML
Option to accelerate mobile links
Brotli compression on assets served.
Optio to enable BETA Rocket loader for Javascript performance tweaks.
Run Javascript service workers from the 120+ CDN’s
Page/URL rules o perform custom actions (redirects, skip cache, Encryption etc)
HTTP/2 on, IPV6 ON
Option to setup load balancing/failover
CTO of Cloudflare responded in Twitter 🙂
Option to enable rate limiting (charged at 10,000 hits for $0.05c)
Option to block countries (pro feature)
Option to install apps in Cloudflare like(Goole Analytics,

Cloudflare Cons

No more logging into NameCheap to perform DNS management (I now goto Cloudflare, Namecheap are awesome).
Cloudflare Support was slow/confusing (I ended up figuring out the redirect problem myself).
Some sort of verify Cloudflare Setup/DNS/CDN access would be nice. After I set this up my gtmetrix load times were the same and I was not sure if DNS needs to replicate? Changing minify settings in Cloudflare did not seem to happen.
WordPress draft posts are being cached even though page riles block wp-admin page caching.
Would be nice to have ad automatic Under Attack mode
Now all sub-domains were transferred in the setup ( id did not know for weeks)

Cloudflare status

Check out https://www.cloudflarestatus.com/ for status updates.

Don’t forget to install the CloudFlare Plugin for WordPress if you use WordPress.

More Reading

Check out my OWASP Zap and Kali Linux self-application Penetration testing posts.

I hope this guide helps someone.

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Revision History

v1.8 host Command from the OSX CLI

v1.7 Subdomain error

v1.6 Cloudflare Attack

v1.5 WordPress Plugin

v1.4 More Reading

v1.3 added WAF snip

v1.2 Added Google Page Speed Insights and webpage rest results

v1.1 Added Y-Slow

v1.0 Initial post

How to optimize your sites Search Engine Optimization (SEO) and grow customers without paying for Ads

September 9, 2017 by Simon

How to optimize your sites Search Engine Optimization (SEO) and grow customers without paying for Ads.

This guide is a shorter post around setting up SEO (Search Engine Optimization) and driving more traffic to your site without buying ADs. In a nutshell, to have better SEO you need to jump some technical hurdles in order to drive more traffic to your site from search engines along with understanding your customer’s needs and making things easier for them.

I have blogged about this topics before but these posts are too long in reflection.

Buying Ad’s?

Facebook, Google, Bing and advertising agencies will recommend you set goals around growth and site traffic and pay for those goals to succeed (usually by advertisements).

Don’t get me wrong Advertising works but it is a competitive market, Online sites can easily setup the display of Ad’s on their site (my guide here Add Google AdWords to your WordPress blog, https://fearby.com/article/add-google-adwords-wordpress-blog/ ). You can buy physical billboard ad’s on the side of roads (e.g http://www.buythisspace.com.au/). I tried to enquire about the costs of a physical billboard but the agencies robot verification rejected my enquiry submission so I gave up. Advertising is buying peoples times and people now how to avoid ad’s and not interact with them (7 Marketing Lessons from Eye-Tracking Studies https://blog.kissmetrics.com/eye-tracking-studies/)

Do more of what works

Spoiler: This guide will recommend you do more of what works over buying millions of ad’s and hoping for new and engaged customers and customer growth.

If you don’t already have Google Analytics setup on your site then do it, you cannot identify your customers or identify what is broken or in turn fix it (Setting up Google Analytics on your website, https://fearby.com/article/setting-up-google-analytics-on-your-website/ )
Monitor Data – Do review your logs and customer related data (review orders, customers and try and identify what works. Software like https://www.zoho.com/one/applications/web.html will help you connect the dots.
Adobe Audience Cloud: http://www.adobe.com/au/experience-cloud.html is a more expensive software suite for driving decisions based on data.
Benchmarks – Set goals and work toward them (e.g I want 10x more customers).

SEO Tip’s

This older article on How to boost your site’s SEO attempts to mention what you need to do it to get better SEO.

Do run a modern great site

I am a big fan of word of mouth over free/organic traffic over paid customers via advertising (Mostly because I am tight and realize advertising can be a bottomless pit). The single biggest thing you can do to have more organic traffic from search engines is run a modern and fast website, have valuable content and make it as easy for the customer as possible. This is why I moved my site and setup an SSL certificate (link to article).

Search engines like your site to be fast, updated frequently, have sitemaps to make their jobs easier and have an SSL certificate to keep the web safe etc.

Google, Bing and other search engines will not send traffic your way if you do not satisfy them that your site is liked or has valuable content. Google makes money from Google Analytics by helping people understand their site’s visitors then recommend you pay for ad’s to use on sites that have AdWords on their site ( WordPress to a new self-managed server away from CPanel ).

How to boost your site’s SEO https://fearby.com/article/how-to-boost-your-sites-seo/
Your website needs to be fast, use sites like https://www.webpagetest.org to measure how fast your site is (Aim for all A’s). Read this page for information on the impact of slow websites https://www.searchenginejournal.com/mobile-page-speed-benchmarks/194511/
Mobile friendly – Ensure your site is mobile friendly (or risk being dropped from search engine results)
SSL – Do have a secure SSL certificate on your website (view mine here https://www.ssllabs.com/ssltest/analyze.html?d=www.fearby.com&s=45.63.29.217&latest).
Incoming links – Having incoming links to your site tell search engines that your site is popular.

Traffic Source types

Organic – An organic visitor to your site is one who found your site by searching something that was relevant to their search term and not by clicking on an advertisement.
Paid – A paid user is someone who has clicked an ad to come to your site.
Social – A social visitor is one who is known to come from a social media site, using social media sites like Twitter, Facebook or Instagram is a must to driving organic traffic (go where the people are).

Engagement

How engaged are your customers? Have you asked your customers recently what they value or appreciate about your business or product? Have you asked for feedback recently?

User Engagement Levels

None – Do you have landing pages that quickly inform customers of your products or services?
Low – What do they need to know about your product or service?
Medium – Aware (engaged)
High – Can this person be an advocate for your business?
Gone – Did you get exit Feedback?

Ways to engage already engaged customers.

Setup a free MailChimp Newsletter to allow willing people to be alerted of new communication https://login.mailchimp.com/signup/?source=website&pid=GAW
Web Browser popup Alerts can be a great way to engage with users when new content is added to your site (Read the guide here https://documentation.onesignal.com/docs/web-push-setup )
Mobile apps or mobile friendly website are a no brainer given 2 billion people use mobile phones ( http://www.smartinsights.com/mobile-marketing/mobile-marketing-analytics/mobile-marketing-statistics/ ).

What can you do to help understand your customer’s needs and make their purchase processes easier?

Why are your customers leaving?

Understand more about your customers reasons for leaving and act upon preventing others from leaving.

Trying something new (Does your website need to be simpler?)
Are your products too expensive?.
Your site (or ordering) is not convenient (Do you need to setup online ordering/subscriptions and delivery?)
etc

Who are your customers

Personas – Do setup customer personas in order to focus on your customer segments (get a free customer persona template here https://blog.hubspot.com/blog/tabid/6307/bid/33491/everything-marketers-need-to-research-create-detailed-buyer-personas-template.aspx )
Does your website match these personas?

Are your customers.

Engaged
Informed
Advocates

Feedback

Do you have feedback loops (A simple feedback form can solve this)?

What do you know about your customers?

Product Satisfaction
Product Loyalty
Product Awareness

Paid Traffic (Ad’s)

Google Ad’s – Signup Here http://www.google.com.au/adwords/get-started/
Bing – Advertise on Bing here https://advertise.bingads.microsoft.com/
Facebook – Advertise on Facebook here https://www.facebook.com/business/products/ads

Free Traffic (SEO + Organic Ad’s)

Blog Posts (Sharing value/passion)
Social Media Posts (use hashtags)
Instagram (Post value/passion)

Most importantly Do what works (Measure and replicate).

Focus on Business Value

Generate a SWOT Analysis ( Free tool here https://xtensio.com/ )

What are your Strengths?
What are your Weaknesses?
What are your Opportunities?
What are your Threats?

Goals

Goals allow you to investigate, learn, act and measure I order to improve.

Investigate – Data.
Learn/Insight – Make Assumptions.
Act – Act and measure.

Read more about customer engagement here https://en.wikipedia.org/wiki/Customer_engagement

Bonus

Do ensure your website is compliant with accessibility and technical standards

Test our sites Accessibility – https://achecker.ca/checker/index.php
Test your sites HTML5 Compliance – https://validator.w3.org
Test your Google PageSpeed Test – https://developers.google.com/speed/pagespeed/insights/
Do A B testing to determine the statistical significance of changes to your site.

Conclusion

The more you know the better you can connect, Do set goals and as a minimum setup Google Analytics, SSL certificate and submit your site to search engines, then focus on a fast site that makes things simple for your customers.

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v1.0 Initial version

Installing Webmin Server Management web GUI on Ubuntu

August 10, 2017 by Simon

Setting up Ubuntu in the cloud is great if you are not afraid of using the command line but for those that need it, there are web based server management GUI’s you can install.

Once Ubuntu is installed (I have many guides at www.fearby.com) you can install http://www.webmin.com/ (web based management GUI for Ubuntu). It is similar to https://runcloud.io but it’s free. Read the Webadmin install guide here.

Ubuntu Install Steps

Run this in your root terminal to install Webmin on Ubuntu after you install and configure a web server, MySQL and SSL.

sudo sh -c 'echo "deb http://download.webmin.com/download/repository sarge contrib" > /etc/apt/sources.list.d/webmin.list'
wget -qO - http://www.webmin.com/jcameron-key.asc | sudo apt-key add -
sudo apt-get update
sudo apt-get install webmin

Allow port 1000 on your firewall (in my case I am limiting this to my public IP).

sudo ufw allow from 555.55.555.555/24 to any port 10000

I opened port 10,000 on my Digital Ocean firewall screen too.

I installed an SSL certificate on my server (my guide here). I am having issues with Google Chrome and my SSL certificate so I switched ot safari.

I navigated to https://mydomain.com:10000 to log in to the Webmin dashboard

I could now log in to Webmin so I reset the password???

/usr/share/webmin/changepass.pl /etc/webmin username password

Now I can login to Webmin

Webmin has a load of options available, I zeroed in on viewing log files.

I think I need to ban a few IP’s in my firewall based on the login attempts above. View my guide on securing Ubuntu in the cloud.

Done

sudo ufw deny from 92.87.236.65
Rule added

sudo ufw deny from 106.14.3.252
Rule added

sudo ufw deny from 101.200.52.128
Rule added

sudo ufw deny from 47.94.22.157
Rule added

Webmin has a great section on Ubuntu Users

View User Details

Securing Webmin Configuration then IP Access Control and whitelist your IP address to ensure no one else can view your server (I went to http://icanhazip.com to get my IP address).

I then used the Webmin backup screen to backup my system.

This is great, it is backing up my system 🙂

pwd
/
ls -al
total 142372
drwxr-xr-x  27 root root      4096 Aug  9 23:27 .
drwxr-xr-x  27 root root      4096 Aug  9 23:27 ..
-rw-r--r--   1 root root 145670144 Aug  9 23:33 backup.tar

I used pydf to see how much storage space I have (I am only using 2.65GB but have 17GB available).

pydf
Filesystem Size  Used Avail Use%                                  Mounted on
/dev/vda1   19G 2658M   17G 13.5 [####..........................] /
/dev/vda15 104M 3425k  101M  3.2 [#.............................] /boot/efi

Gzip is taking a load of time to backup my system.

I did not need to use (htop) to monitor the CPU, Webmin has a CPU monitor built in.

Webmin also allows you to add users

Beware though you need to assign a user to modules or they won’t be able to do/see much when they login.

If you provide your MySQL root password you can create databases in Webmin under Servers then MySQL Database Server

Loads of database options that I would normally use Adminer for 🙂

File Browser

There is a file browser but (I can’t seem to drag and drop).

Official documentation is found here. I’ll add more to this post as I discover it.

Check out my other posts at www.fearby.com.

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v1.0 Initial Post

Securing Ubuntu in the cloud

August 9, 2017 by Simon

It is easy to deploy servers to the cloud within a few minutes, you can have a cloud-based server that you (or others can use). ubuntu has a great guide on setting up basic security issues but what do you need to do.

If you do not secure your server expect it to be hacked into. Below are tips on securing your cloud server.

First, read more on scanning your server with Lynis security scan.

Always use up to date software

Always use update software, malicious users can detect what software you use with sites like shodan.io (or use port scan tools) and then look for weaknesses from well-published lists (e.g WordPress, Windows, MySQL, node, LifeRay, Oracle etc). People can even use Google to search for login pages or sites with passwords in HTML (yes that simple). Once a system is identified by a malicious user they can send automated bots to break into your site (trying millions of passwords a day) or use tools to bypass existing defences (Security researcher Troy Hunt found out it’s child’s play).

Portscan sites like https://mxtoolbox.com/SuperTool.aspx?action=scan are good for knowing what you have exposed.

You can also use local programs like nmap to view open ports

Instal nmap

sudo apt-get install nmap

Find open ports

nmap -v -sT localhost

Starting Nmap 7.01 ( https://nmap.org ) at 2017-08-08 23:57 AEST
Initiating Connect Scan at 23:57
Scanning localhost (127.0.0.1) [1000 ports]
Discovered open port 80/tcp on 127.0.0.1
Discovered open port 3306/tcp on 127.0.0.1
Discovered open port 22/tcp on 127.0.0.1
Discovered open port 9101/tcp on 127.0.0.1
Discovered open port 9102/tcp on 127.0.0.1
Discovered open port 9103/tcp on 127.0.0.1
Completed Connect Scan at 23:57, 0.05s elapsed (1000 total ports)
Nmap scan report for localhost (127.0.0.1)
Host is up (0.00020s latency).
Not shown: 994 closed ports
PORT     STATE SERVICE
22/tcp   open  ssh
80/tcp   open  http
3306/tcp open  mysql
9101/tcp open  jetdirect
9102/tcp open  jetdirect
9103/tcp open  jetdirect

Read data files from: /usr/bin/../share/nmap
Nmap done: 1 IP address (1 host up) scanned in 0.17 seconds
           Raw packets sent: 0 (0B) | Rcvd: 0 (0B)

Limit ssh connections

Securing an Ubuntu VM with a free LetsEncrypt SSL certificate in 1 Minute

July 29, 2017 by Simon

I visited https://letsencrypt.org/ where it said Let’s Encrypt is a free, automated, and open SSL Certificate Authority. That sounds great, time to check them out. This may not take 1 minute on your server but it did on mine (a self-managed Ubuntu 16.04/NGINX server). If you are not sure why you need an SSL cert read Life Is About to Get a Whole Lot Harder for Websites Without Https from Troy hunt.

FYI you can set up an Ubuntu Vutur VM here (my guide here) for as low as $2.5 a month or a Digital Ocean VM server here (my guide here) for $5 a month, billing is charged to the hour and is cheap as chips.

Buy a domain name from Namecheap here.

But for the best performing server read my guide on the awesome UpCloud VM hosts (get $25 free credit by signing up here). Also read my recent post on setting up Lets Encrypt on sub domains.

I clicked Get Started and read the Getting started guide. I was redirected to https://certbot.eff.org/ where it said: “Automatically enable HTTPS on your website with EFF’s Certbot, deploying Let’s Encrypt certificates.“. I was asked what web server and OS I use..

I confirmed my Linux version

lsb_release -a

Ensure your NGINX is setup (read my Vultr guide here) and you have a”server_name” specified in the “/etc/nginx/sites-available/default” file.

e.g

server_name yourdomain.com www.yourdomain.com;

I also like to set “root” to “/www” in the NGINX configuration.

e.g

root /www;

Tip: Ensure the www folder is set up first and has ownership.

mkdir /www
sudo chown -R www-data:www-data /www

Also, make and verify the contents of a /www /index.html file.

echo "Hello World..." > /www/index.html && cat /www/index.html

I then selected my environment on the site (NGINX and Ubuntu 16.04) and was redirected to the setup instructions.

FYI: I will remove mention of my real domain and substitute with thesubdomain.thedomain.com for security in the output below.

I was asked to run these commands

sudo apt-get update
sudo apt-get install software-properties-common
sudo add-apt-repository ppa:certbot/certbot
sudo apt-get update
sudo apt-get install python-certbot-nginx

Detailed instructions here.

Obtaining an SSL Certificate

I then ran the following command to automatically obtain and install (configure NGINX) an SSL certificate.

sudo certbot --nginx

Output

sudo certbot --nginx
Saving debug log to /var/log/letsencrypt/letsencrypt.log

Enter email address (used for urgent renewal and security notices) (Enter 'c' to
cancel):Invalid email address: .
Enter email address (used for urgent renewal and security notices)  If you
really want to skip this, you can run the client with
--register-unsafely-without-email but make sure you then backup your account key
from /etc/letsencrypt/accounts   (Enter 'c' to cancel): [email protected]

-------------------------------------------------------------------------------
Please read the Terms of Service at
https://letsencrypt.org/documents/LE-SA-v1.1.1-August-1-2016.pdf. You must agree
in order to register with the ACME server at
https://acme-v01.api.letsencrypt.org/directory
-------------------------------------------------------------------------------
(A)gree/(C)ancel: A

-------------------------------------------------------------------------------
Would you be willing to share your email address with the Electronic Frontier
Foundation, a founding partner of the Let's Encrypt project and the non-profit
organization that develops Certbot? We'd like to send you email about EFF and
our work to encrypt the web, protect its users and defend digital rights.
-------------------------------------------------------------------------------
(Y)es/(N)o: Y

Which names would you like to activate HTTPS for?
-------------------------------------------------------------------------------
1: thesubdomain.thedomain.com
-------------------------------------------------------------------------------
Select the appropriate numbers separated by commas and/or spaces, or leave input
blank to select all options shown (Enter 'c' to cancel):1
Obtaining a new certificate
Performing the following challenges:
tls-sni-01 challenge for thesubdomain.thedomain.com
Waiting for verification...
Cleaning up challenges
Deployed Certificate to VirtualHost /etc/nginx/sites-enabled/default for set(['thesubdomain.thedomain.com', 'localhost'])
Please choose whether HTTPS access is required or optional.
-------------------------------------------------------------------------------
1: Easy - Allow both HTTP and HTTPS access to these sites
2: Secure - Make all requests redirect to secure HTTPS access
-------------------------------------------------------------------------------
Select the appropriate number [1-2] then [enter] (press 'c' to cancel): 2
Redirecting all traffic on port 80 to ssl in /etc/nginx/sites-enabled/default

-------------------------------------------------------------------------------
Congratulations! You have successfully enabled https://thesubdomain.thedomain.com

You should test your configuration at:
https://www.ssllabs.com/ssltest/analyze.html?d=thesubdomain.thedomain.com
-------------------------------------------------------------------------------

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at
   /etc/letsencrypt/live/thesubdomain.thedomain.com/fullchain.pem. Your cert will expire on 2017-10-27. To obtain a new or tweaked version
   of this certificate in the future, simply run certbot again with
   the "certonly" option. To non-interactively renew *all* of your
   certificates, run "certbot renew"
 - Your account credentials have been saved in your Certbot
   configuration directory at /etc/letsencrypt. You should make a
   secure backup of this folder now. This configuration directory will
   also contain certificates and private keys obtained by Certbot so
   making regular backups of this folder is ideal.
 - If you like Certbot, please consider supporting our work by:

   Donating to ISRG / Let's Encrypt:   https://letsencrypt.org/donate
   Donating to EFF:                    https://eff.org/donate-le

That was the easiest SSL cert generation in history.

SSL Certificate Renewal (dry run)

sudo certbot renew --dry-run

Saving debug log to /var/log/letsencrypt/letsencrypt.log

-------------------------------------------------------------------------------
Processing /etc/letsencrypt/renewal/thesubdomain.thedomain.com.conf
-------------------------------------------------------------------------------
Cert not due for renewal, but simulating renewal for dry run
Renewing an existing certificate
Performing the following challenges:
tls-sni-01 challenge for thesubdomain.thedomain.com
Waiting for verification...
Cleaning up challenges

-------------------------------------------------------------------------------
new certificate deployed with reload of nginx server; fullchain is
/etc/letsencrypt/live/thesubdomain.thedomain.com/fullchain.pem
-------------------------------------------------------------------------------
** DRY RUN: simulating 'certbot renew' close to cert expiry
**          (The test certificates below have not been saved.)

Congratulations, all renewals succeeded. The following certs have been renewed:
  /etc/letsencrypt/live/thesubdomain.thedomain.com/fullchain.pem (success)
** DRY RUN: simulating 'certbot renew' close to cert expiry
**          (The test certificates above have not been saved.)

IMPORTANT NOTES:
 - Your account credentials have been saved in your Certbot
   configuration directory at /etc/letsencrypt. You should make a
   secure backup of this folder now. This configuration directory will
   also contain certificates and private keys obtained by Certbot so
   making regular backups of this folder is ideal.

SSL Certificate Renewal (Live)

certbot renew

The Lets Encrypt SSL certificate is only a 90-day certificate.

Again: The Lets Encrypt SSL certificate is only a 90-day certificate.

I’ll run “certbot renew” again 2 months time to manually renew the certificate (and configure my higher security configuration (see below)).

Certbot NGINX Config renew (what did it do)

It’s nice to see forces HTTPS added to the configuration

if ($scheme != "https") {
   return 301 https://$host$request_uri;
} # managed by Certbot

Cert stuff added

    listen 443 ssl; # managed by Certbot
ssl_certificate /etc/letsencrypt/live/thesubdomain.thedomain.com/fullchain.pem; # managed by Certbot
ssl_certificate_key /etc/letsencrypt/live/thesubdomain.thedomain.com/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot

Contents of /etc/letsencrypt/options-ssl-nginx.conf

ssl_session_cache shared:le_nginx_SSL:1m;
ssl_session_timeout 1440m;

ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;

ssl_ciphers "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";

This contains too many legacy cyphers for my liking.

I changed /etc/letsencrypt/options-ssl-nginx.conf to tighten ciphers and add TLS 1.3 (as my NGINX Supports it).

ssl_session_cache shared:le_nginx_SSL:1m;
ssl_session_timeout 1440m;

ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
ssl_prefer_server_ciphers on;

ssl_ciphers "EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH";

Enabling OCSP Stapling and Strict Transport Security in NGINX

I add the following to /etc/nginx/sites/available/default

# OCSP (Online Certificate Status Protocol) is a protocol for checking if a SSL certificate has been revoked
ssl_stapling on; # Requires nginx >= 1.3.7
ssl_stapling_verify on; # Requires nginx => 1.3.7
add_header Strict-Transport-Security "max-age=63072000; includeSubdomains; preload";

Restart NGINX.

sudo nginx -t
sudo nginx -s reload
sudo /etc/init.d/nginx restart

SSL Labs SSL Score

I am happy with this.

Read my guide on Beyond SSL with Content Security Policy, Public Key Pinning etc

Automatic SSL Certificate Renewal

There are ways to auto renew the SSL certs floating around YouTube but I’ll stick to manual issue and renewals of SSL certificates.

SSL Checker Reports

‘I checked the certificate with other SSL checking sites.

NameCheap SSL Checker – https://decoder.link/sslchecker/ (Passed). I did notice that the certificate will expire in 89 days (I was not aware of that). I guess a free 90-day certificate for a noncritical server is OK (as long as I renew it in time).

CertLogik – https://certlogik.com/ssl-checker/ (OK)

Comodo – https://sslanalyzer.comodoca.com (OK)

Lets Encrypt SSL Certificate Pros

Free.
Secure.
Easy to install.
Easy to renew.
Good for local, test or development environments.
It auto-detected my domain name (even a subdomain)

Lets Encrypt SSL Certificate Cons

The auto install process does not setup OCSP Stapling (I configured NGINX but the certificate does not support it may be to limit the Certificate Authority resources handing the certificate revocation checks).
The auto install process does not setup HSTS. (I enabled it in NGINX manually).
The auto install process does not setup HPKP. More on enabling Public Key Pinning in NGINX here.
Too many cyphers installed by default.
No TLS 1.3 installed by default by the install process in my NGINX config in the default certbot secure auto install (even though my NGINX supports it). More on enabling TLS 1.3 in NGINX here.

Read my guide on Beyond SSL with Content Security Policy, Public Key Pinning etc

I’d recommend you follow these Twitter security users

http://twitter.com/GibsonResearch

https://twitter.com/troyhunt

https://twitter.com/0xDUDE

Troubleshooting

I had one server were certbot failed to verify the SSL and said I needed a public routable IP (it was) and that the firewall needed to be disabled (it was). I checked the contents of “/etc/nginx/sites-available/default” and it appeared no additional SSL values were added (not even listening on port 443?????).

I am viewing: /var/log/letsencrypt/letsencrypt.log

Forcing Certificate Renewal

Run the following command to force a certificate to renew outside the crontab renewal window.

certbot renew --force-renew

Conclusion

Free is free but I’d still use paid certs from Namecheap for important stuff/sites, not having OCSP stapling on the CA and 90-day certs is a deal breaker for me. The Lets Encrypt certificate is only a 90-day certificate (I’d prefer a 3-year certificate).

A big thank you to Electronic Frontier Foundation for making this possible and providing a free service (please donate to them)..

Lets Encrypt does recommend you renew certs every 60 days or use auto-renew tools but rate limits are in force and Lets Encrypt admit their service is young (will they stick around)? Even Symantec SSL certs are at risk.

Happy SSL’ing.

Check out the extensive Hardening a Linux Server guide at thecloud.org.uk: https://thecloud.org.uk/wiki/index.php?title=Hardening_a_Linux_Server

fyi, I followed this guide setting up Let’s Encrypt on Ubuntu 18.04.

Read my guide on the awesome UpCloud VM hosts (get $25 free credit by signing up here).

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v1.8 Force Renew Command

v1.7 Ubuntu 18.94 info

V1.62 added hardening Linux server link

Type	Protocol	Port Range	Source	Comment
HTTP	TCP	80	0.0.0.0/0	Opens a web server port for later
All ICMP	ALL	N/A	0.0.0.0/0	Allows you to ping
All traffic	ALL	All	0.0.0.0/0	Not advisable long term but OK for testing today.
SSH	TCP	22	0.0.0.0/0	Not advisable, try and limit this to known IP’s only.
HTTPS	TCP	443	0.0.0.0/0	Opens a secure web server port for later

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