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84 lines
2.5 KiB
Markdown
84 lines
2.5 KiB
Markdown
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---
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title: Synology Telnet password
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language: en
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layout: default
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created: 2016-01-26 19:54:55 +0100
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updated: 2016-01-26 19:54:55 +0100
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toc: true
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tags:
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- know-how
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- hacking
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- hardware
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- synology
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- xpenology
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- telnet
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- password
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---
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If you ever had a problem with your Synology DiskStation, you might have
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stumbled upon the emergency telnet access or even the serial port on the PCB.
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Or maybe you just wanted to set it (or XPEnology) up and needed the `root`
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password to configure a static IP in order to access the web based setup.
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But what is the password?
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Luckily, Gui Ambros took a look at the GPL'ed source code and
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[made a small C snippet](https://wrgms.com/synologys-secret-telnet-password/)
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to generate that password.
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It is based on the current day and month.
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<script>
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var today = new Date();
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var d = today.getDate();
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var m = today.getMonth() + 1;
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var mh = m.toString(16);
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var pm = ('0' + m).substr(-2);
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var pdh = ('0' + d.toString(16)).substr(-2);
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var months = ['January', 'February', 'March', 'April', 'May', 'June', 'July',
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'August', 'September', 'October', 'November', 'December'];
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function gcd(x, y) {
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return y?gcd(y, x%y):Math.abs(x);
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}
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var x = gcd(d, m);
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var px = ('0' + x).substr(-2);
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document.write('Today\'s (' + d + ' ' + months[m-1] + ') password is: <code>' + mh + pm + '-' + pdh + px + '</code>');
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</script>
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The structure is like this:
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1. Current month in hexadecimal, lower case (Jan:`1`, Feb:`2`, … , Oct:`a`, Nov:`b`, Dec:`c`)
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1. Current month in decimal, 2 characters, zero padded (`01`, `02`, …, `11`, `12`)
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1. Minus (`-`)
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1. Current day of the month in hex, 2 characters, zero padded, lower case (`01`, `02`, …, 10:`0a`, …, 30:`1e`, 31:`1f`)
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1. [Greatest common divisor](https://en.wikipedia.org/wiki/Greatest_common_divisor) between month and day, 2 characters, zero padded (`01`, …, `12`)
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Here is a small Python snippet to calculate today's password:
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{% highlight python %}
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from datetime import date
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import fractions
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today = date.today()
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m = today.month
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d = today.day
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print("%x%02d-%02x%02d" % (m, m, d, fractions.gcd(d, m)))
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{% endhighlight %}
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And if you look at the source code of this page, you'll find the JavaScript
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which calculates the code displayed above.
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<p><div class="notetip" markdown="1">
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If the generated password doesn't work, also try `101-0101`. After a bootup, the
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time might be reset to 1 January 1970.
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</div></p>
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By the way: This password doesn't work for SSH after you've setup your Synology.
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After the setup, the `root` password is that of your `admin` user.
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