My Blog Setup
Hello Internet! This is the first entry of my blog. I am a software engineer working for Siemens Technology in Germany. I mostly work on IoT related projects in different industrial branches like smart infrastructure, manufacturing, energy, healthcare etc. You can find out more about me on my about page.
I mostly do backend stuff with golang in my professional life and feel comfortable automating stuff with Linux. Nowadays it's almost impossible to evade web technology, as most desktop applications have disappeared.
As nobody has ever learned anything, without getting their hands dirty, I decided to hand-write HTML / CSS for this blog, to see how far this approach can take me (probably not that far, as the plethora of static site generators, CSS frameworks and worry-free hosting providers don't exist for nothing).
Domain and Web Server
I reserved www.hadjian.com and www.hadjian.de ages ago
from a German hosting provider and never cared to put
something up. I was able to SSH into the server and
checked the settings of
my surprise, all users including
allowed to login via password! Can you spell
Since this is the internet we're talking about, I checked the frequency of login attempts by hackers or script kiddies (see output below, snipped for sanity).
email@example.com:~$ sudo lastb -- snip -- root ssh:notty 22.214.171.124 Fri Jan 1 04:23 - 04:23 (00:00) root ssh:notty 126.96.36.199 Fri Jan 1 04:23 - 04:23 (00:00) ubuntu ssh:notty 188.8.131.52 Fri Jan 1 04:22 - 04:22 (00:00) gary ssh:notty 184.108.40.206 Fri Jan 1 04:22 - 04:22 (00:00) ubuntu ssh:notty 220.127.116.11 Fri Jan 1 04:22 - 04:22 (00:00) gary ssh:notty 18.104.22.168 Fri Jan 1 04:22 - 04:22 (00:00) root ssh:notty 135.ip-51-83-128 Fri Jan 1 04:22 - 04:22 (00:00) redmine ssh:notty 22.214.171.124 Fri Jan 1 04:22 - 04:22 (00:00) redmine ssh:notty 126.96.36.199 Fri Jan 1 04:22 - 04:22 (00:00) indra ssh:notty vps-8ee9d389.vps Fri Jan 1 04:21 - 04:21 (00:00) indra ssh:notty vps-8ee9d389.vps Fri Jan 1 04:21 - 04:21 (00:00) oracle ssh:notty 188.8.131.52 Fri Jan 1 04:21 - 04:21 (00:00) oracle ssh:notty 184.108.40.206 Fri Jan 1 04:21 - 04:21 (00:00) cmsadmin ssh:notty 220.127.116.11 Fri Jan 1 04:21 - 04:21 (00:00) cmsadmin ssh:notty 18.104.22.168 Fri Jan 1 04:21 - 04:21 (00:00) tmp ssh:notty 22.214.171.124 Fri Jan 1 04:20 - 04:20 (00:00) tmp ssh:notty 126.96.36.199 Fri Jan 1 04:20 - 04:20 (00:00) bot ssh:notty 188.8.131.52 Fri Jan 1 04:20 - 04:20 (00:00) -- snip --
Who is gary and why was he trying to break into
my server? Luckily
failed attempts. When I ran
last it only
showed my own logins, although a good hacker would
have wiped that probably. So roughly 5-6 attempts per
Adding (slightly more) Security
First things first:
firstname.lastname@example.org:~$ sudo apt update email@example.com:~$ sudo apt upgrade
After updating all the packages, I modified
- dissallow root login,
- only allow a specific group to login and
- only allow key-based login / disabling password login
Before that, I added my user to the login group,
created an SSH key with
ssh-keygen on my
local machine and copied over the public key to
~/.ssh/authorized_keys. Then I restarted
sshd. Now I should be the only one being
able to login.
Next, I checked running processes:
hadjian@s18186989:~$ sudo ps ax PID TTY STAT TIME COMMAND 1 ? Ss 3:34 init 2 ? S 0:00 [kthreadd/800044] 3 ? S 0:00 [khelper/8000447] 311 ? Ssl 12:03 rsyslogd 316 ? Ss 0:00 dbus-daemon --system --fork 323 ? Ss 0:00 /lib/systemd/systemd-logind 508 ? Ss 0:00 /usr/sbin/xinetd -dontfork -pidfile /var/run/xinetd.pid -stayalive -inetd_com 522 ? Ss 0:14 cron 746 ? Ss 0:00 /usr/sbin/saslauthd -a pam -c -m /var/run/saslauthd -n 2 748 ? S 0:00 /usr/sbin/saslauthd -a pam -c -m /var/run/saslauthd -n 2 777 tty1 Ss+ 0:00 /sbin/getty 38400 console 780 tty2 Ss+ 0:00 /sbin/getty 38400 tty2 5028 ? Ss 0:00 /usr/sbin/sshd -D 5244 ? Ss 0:00 nginx: master process /usr/sbin/nginx 5245 ? S 0:18 nginx: worker process 5246 ? S 0:18 nginx: worker process 5247 ? S 0:18 nginx: worker process 5248 ? S 0:00 nginx: worker process 5953 ? Ss 0:00 sshd: hadjian [priv] 5964 ? S 0:00 sshd: hadjian@pts/1 5965 pts/1 Ss+ 0:00 -bash 6010 ? Ss 0:00 sshd: hadjian [priv] 6021 ? S 0:00 sshd: hadjian@pts/3 6022 pts/3 Ss+ 0:00 -bash 6044 ? Ss 0:00 sshd: hadjian [priv] 6055 ? S 0:00 sshd: hadjian@pts/4 6056 pts/4 Ss 0:00 -bash 6620 pts/4 S+ 0:00 sudo ps ax 6621 pts/4 R+ 0:00 ps ax 20253 ? S 0:00 upstart-file-bridge --daemon 20257 ? S 0:00 upstart-socket-bridge --daemon 28952 ? S 0:00 upstart-udev-bridge --daemon 28955 ? Ss 0:00 /lib/systemd/systemd-udevd --daemon 29575 ? Ssl 0:00 /usr/sbin/named -u bind
Nothing worrying to my understanding, excpet maybe the
Why is that installed?
xinetd is a
super-server, which invokes others, in case their port
is connected to. Trying to deinstall it should list
dependent packages and tell me, if there is something
I might need. It didn't list anything dependent, so I
saslauthd had some dependencies however,
which don't seem necessary for my purposes:
hadjian@s18186989:~$ apt-cache rdepends sasl2-bin sasl2-bin Reverse Depends: sendmail-bin qpidd postfix sasl2-bin:i386 sendmail-bin rinputd qpidd libapache2-mod-authn-sasl cyrus-common-2.4 cyrus-admin-2.4 postfix
I was not going to use my webserver as a mailserver and all of those packages have to do with mail. Also I was going to use nginx instead of apache, so all of that could go away, if it was installed. Now I have a list of running processes, I am familiar with and which are required for webserver operations.
Now to the open ports:
hadjian@s18186989:~$ sudo netstat -tulpn [sudo] password for hadjian: Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 5244/nginx tcp 0 0 184.108.40.206:53 0.0.0.0:* LISTEN 29575/named tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN 29575/named tcp 0 0 0.0.0.0:3223 0.0.0.0:* LISTEN 5028/sshd tcp 0 0 127.0.0.1:953 0.0.0.0:* LISTEN 29575/named tcp6 0 0 :::80 :::* LISTEN 5244/nginx tcp6 0 0 :::53 :::* LISTEN 29575/named tcp6 0 0 :::3223 :::* LISTEN 5028/sshd tcp6 0 0 ::1:953 :::* LISTEN 29575/named udp 0 0 220.127.116.11:53 0.0.0.0:* 29575/named udp 0 0 127.0.0.1:53 0.0.0.0:* 29575/named udp6 0 0 :::53 :::* 29575/named
SSH, nginx and named have ports open, which seems ok. With the minimum of proccesses running, a minimum of ports open and a secure way to login, I think I can proceed to actually putting content on the site.
Nowadays it probably doesn't make sense to run your own server and hand-write HTML / CSS. We have medium, worpress and similar things and even going one level below the convenience layer, you'd probably use bootstrap and deploy to github pages, Heroku or AWS S3.
I wanted to write at least one web-site the most ancient way available, to see how much the browser can do nowadays. So let's get started.
The Blogs that I frequently read are more informative and less design-focused. I wanted to follow that strategy and compared some of my frequents:
Looks simple: a header with the name of the website, a small navbar with links to "blog", "github" and "about". The main area will contain list of articles previews, to get straight to the point.
So let's make a plan:
- Site Structure
- A landing page with a list of articles and links to an "about"-page and my github page. The landing page will display a list of all articles. I will cheat and put my CV as pdf behind the "about"-link. It is written in LaTeX and I don't want to recreate it in HTML.
- Page Structure
HTML5 introduced semantic tags, which are
quite well defined if you write a
text-document. So it was straigh-forward to
use them in the creation of a blog.
For the landing page, the
navbar, while the
mainarea contains merely a list of
articleelements like in the below figure. An actual blog entry will have the same structure, but only one article element.
CSS has become a joy to work with. I remember
my first experiments a couple of years ago,
where centering was hard! Now it is
margin: 0 auto;I wanted to display the title and the navbar in one line, if there is enough space (see responsiveness below). This was also easily done using
display: flex, aligning the links to the right with
justify-content: flex-end;and exanding the title to take up the rest of the space, so the text can be left-aligned, while pushing the links to the right. This is done with
flex: 1 auto;. The result:
Normal Flow will
already give me responsiveness for normal
text. Also the header will behave nicely, when
the browser is resized. However, if there is
not enough space for all of the text, the
title text will wrap with the following result:
This happens if either the font-size is
increased or the screen has not enough
horizontal width. There is an easy built-in
mitigation, by using
flex-wrap: wrapon the navbar, which will allow the links to wrap to the next line. I will only add a tiny media query to center the title and navbar horizontally, once they display on two separate lines. The clever thing I learned from MDN is to make the query dependent on the number of charaters with
39em, as centering will also happen if the text is zoomed and not only if the page width falls below a certain number of pixels. Final result:
As a beginner I wrote the CSS without a specific approach, adding lines as I needed them. After the site behaved as I wanted it to do, I ran over the CSS once and deleted/rearranged to make it more sensible. But that is probably all the love that file will get. It was a hobby project anyways.
I know that web-technology is quite forgiving, so I ran my pages through validators to see how much I got wrong on my first go. It wasn't all that bad: After fixing those tiny errors, I would quickly check how large my page size has become. I checked this on the browser network tab by reloading the page and as expected it was with 280 KiB quite tiny, so no need for minifying anything. Also I tried the worst throttling ("Slow 3G") and the page loaded in 11.27 seconds. Great!
The best thing about this project is, that I finally have a blog, where I can do write-ups of the projects I spend a lot of time on.
I did understand lots from following the MDN tutorials and now at least know what "normal flow", "block elements" and "inline elements" are and much much more, so I got my moneys worth of education out of it.
As always, if you really finish a small project, it takes multiple the amount of time you'd thought it would take, so even in private it is important to scope any project to the bare minimum.
Thanks for reading! Feedback is welcome firstname.lastname@example.org