Run cryptominer while the screen is locked

dbus-monitor --session "type=signal,interface=org.gnome.ScreenSaver" | 
while read MSG; do
LOCK_STAT=`echo $MSG | grep boolean | awk '{print $2}'`
if [[ "$LOCK_STAT" == "true" ]]; then
echo "was locked"
killall ethdcrminer64
screen -d -m /home/user/Downloads/Claymore/ethdcrminer64 -epool exp-us.dwarfpool.com:8018 -ewal 0xaddresshere/m3 -epsw x -allpools 1 -gser 2 -allcoins exp
else
echo "was un-locked"
killall ethdcrminer64
fi
done

Swap space notes

Whats using swap space

for file in /proc/*/status ; do awk '/VmSwap|Name/{printf $2 " " $3}END{ print ""}' $file; done | sort -k 2 -n -r | less

Where are my swap files

 cat /proc/swaps

How to add more swap space

1. Create empty file:
This file will contain virtual memory contents so make file big enough for your needs. This one will create 1Gb file which means +1Gb swap space for your system:

dd if=/dev/zero of=/media/fasthdd/swapfile.img bs=1024 count=1M

If you want to make 3Gb file then change count value to count=3M. See man dd for more information.

2. Bake swap file:
Following command is going to make “swap filesystem” inside your fresh swap file.

mkswap /media/fasthdd/swapfile.img

3. Bring up on boot:
To make sure that your new swap space is activated while booting up computer you should add it to filesystem configuration file /etc/fstab. Add it to end of file, this is recommended because other filesystems (at least one that contains swap file) must be mounted in read-write mode before we can access any files.

# Add this line to /etc/fstab
/media/fasthdd/swapfile.img swap swap sw 0 0

4. Activate:
You can either reboot your computer or activate new swap file by hand with following command:

swapon /media/fasthdd/swapfile.img

Original articles

https://askubuntu.com/questions/178712/how-to-increase-swap-space
https://www.cyberciti.biz/faq/linux-which-process-is-using-swap/

Putty SSH settings to stop garbled output

Using ubuntu 18 and tools like glances and iftop would often mangle the output

Changing the default Puttty settings
‘Connection > Data > ‘Terminal-type string’ to ‘putty’ instead of ‘xterm’
and setting your PuTTY settings under Translation and ensure that you have UTF-8 set as the character set then save this as the default profile and enjoy 🙂

Copy files from Andorid phone using ADB – Quicker than MTP

When backing up photos form my Android phone i found that the phone didn’t present as a mass storage device, it would only appear as a MTP\PTP device and the file copy speed was terrible.

So some research led me to using the ADB command, you’ll need to enable USB debugging before this will work.

 

Find your files

adb shell ls /storage/

Back em up

adb pull /storage/self/primary/DCIM/Camera /home/user/photos/

TCPDump commands

HTTP GET or POST commands on port 5000

tcpdump -i eth0 -s 0 -A 'tcp dst port 5000 and tcp[((tcp[12:1] & 0xf0)  >> 2):4] = 0x47455420 or tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x504F5354'

Exchange Autodiscover with HTTP redirect method

Server 2012 R2
Create a new Website on the CAS “autodiscover-redirect”
create a virtual directory called “autodiscover”
Click the virtual directory then open “Http Redirect
enter the url of the exchange server e.g. “https://contoso.com/autodiscover/autodiscover.xml” (Must be HTTPS)
Ensure both “Redirect all requests to excact destination” and “Only redirect requests to content in this directory” are ticked
Test using either https://testconnectivity.microsoft.com/ or a mobile / outlook client.

https://www.mysysadmintips.com/windows/servers/503-configure-exchange-autodiscover-with-multiple-smtp-namespaces

Configure MikroTik VPN using Radius and NPS on Windows AD

Configure NPS on a Domain controller:
(Based on Windows Server 2019)
Install NPS Role
open NPS admin console
Select “RADIUS server for Dial-Up or VPN Connections” and click “Configure VPN or Dial-Up
Select “VPN Connections” and click Next
Click “Add” and fill in details as required (IP must be the IP of the router)
Take note of the Shared Secret
Click next on the rest of the screens (add groups as required)

Note: Before users will be able to authenticate using Radius “Allow Access” on the “Dial-in” Tab for the user in AD will need to be selected as “Control Access throught NPS Network Policy” does not work at least for Windows Server 2016 and above.

on the Mikrotik:
Click “Radius” then “+”
Complete the following:
Service: ppp
Domain: domain
Address: IP of NPS Server
Secret: Password defined while setting up NPS
Src Address: The IP of the interface (Must match the IP Specified in while setting up NPS)

Add the following rule in the firewall:
chain: input, Action: Accept, Protocol: TCP, Dst. Port: 1723
chain: input, Action: Accept. Protocol: 47 (gre)

Source:
https://mivilisnet.wordpress.com/2018/10/01/how-to-integrate-your-mikrotik-router-with-windows-ad/

Metadata service in DHCP namespace

Some gold info
http://kimizhang.com/metadata-service-in-dhcp-namespace/

Whats inside an APT package?

sudo dpkg –listfiles docker-ce

Generate OTP keys in linux – Extracting FreeOTP keys

apt install oathtool
oathtool --totp -b -d 6 KY3OUPMUYWCKS53F

Linux: TOTP Password Generator

https://github.com/philipsharp/FreeOTPDecoder
Enable USB debugging – https://www.kingoapp.com/root-tutorials/how-to-enable-usb-debugging-mode-on-android.htm
Backup the FreeOTP app – adb backup -f ~/freeotp.ab -noapk org.fedorahosted.freeotp
Decompress the backup – dd if=freeotp.ab bs=1 skip=24 | python -c "import zlib,sys;sys.stdout.write(zlib.decompress(sys.stdin.read()))" | tar -xvf -
Decode the keys – https://github.com/philipsharp/FreeOTPDecoder