wiki.mbirth.de/know-how/hacking/_posts/2016-01-26-synology-telnet-password.md

title	language	layout	created	updated	toc	tags
Synology Telnet password	en	default	2016-01-26 19:54:55 +0100	2016-01-26 19:54:55 +0100	true	know-how hacking hardware synology xpenology telnet password

If you ever had a problem with your Synology DiskStation, you might have stumbled upon the emergency telnet access or even the serial port on the PCB.

Or maybe you just wanted to set it (or XPEnology) up and needed the root password to configure a static IP in order to access the web based setup.

But what is the password?

Luckily, Gui Ambros took a look at the GPL'ed source code and made a small C snippet to generate that password.

It is based on the current day and month.

The structure is like this:

1. Current month in hexadecimal, lower case (Jan:1, Feb:2, … , Oct:a, Nov:b, Dec:c)
2. Current month in decimal, 2 characters, zero padded (01, 02, …, 11, 12)
3. Minus (-)
4. Current day of the month in hex, 2 characters, zero padded, lower case (01, 02, …, 10:0a, …, 30:1e, 31:1f)
5. Greatest common divisor between month and day, 2 characters, zero padded (01, …, 12)

Here is a small Python snippet to calculate today's password:

{% highlight python %} from datetime import date import fractions

today = date.today() m = today.month d = today.day

print("%x%02d-%02x%02d" % (m, m, d, fractions.gcd(d, m))) {% endhighlight %}

And if you look at the source code of this page, you'll find the JavaScript which calculates the code displayed above.

If the generated password doesn't work, also try `101-0101`. After a bootup, the time might be reset to 1 January 1970.

By the way: This password doesn't work for SSH after you've setup your Synology. After the setup, the root password is that of your admin user.