by ·Keine Kommentare

Faking Mails with cutomized sender:

mail -s "Everything possible" -aFrom:bill.gargantur@iliketobeanemailfaker.com recipient@maildomain.com < /dev/null

*Will be delivered into spamfolder or not delivered cause SPF checks that mailsender is not authorized sender of the maildomain –> only if accurate spamsolution/SPF is implemented on recipient side

7+

by ·Keine Kommentare

Some time ago I set up a Raspberry and expanded the filesystem to 16GB. Unfortunately I wanted to share the Image afterwards. I tried to reduce the size the easy way and succeeded. Procecure was:

– Created the *.img from the SD-Card of Raspberry via Win32Imager (via Read function)
– Copied the big *.img to a USB Stick (32 GB)
– Created Linux Live CD (Linux Mint) and wrote it to a USB-Stick to boot from it afterwards
– of course also plugged in the USB Stick with the img
– mounted the USB Drive and opened a Console and changed the dir (cd) where the image is

After booting into Linux Mint
– I installed quemu utils via

sudo apt-get install qemu-utils

– checked the img via

fdisk -l image.img

I saw that there are 2 partitions holding only 2,1 Gigs so I did

qemu-img resize vdisk.img 3GB

afterwards I wrote the img to an SD-Card and booted it successfully in a RPI3

Alternative would be: https://www.instructables.com/id/How-to-BackUp-and-Shrink-Your-Raspberry-Pi-Image/

7+

by ·Keine Kommentare

Script copies UltraVNC to target client (C:\vnc\) and executes UltraVNC with configurable settings. Launches VNC Viewer afterwards and removes VNC (optional).

Requirements and Usage:
- Copy psexec.exe to C:\Windows
- Run the Powershell with Admin-Rights / elevated Console
- User has to be admin on the target and local machine
- Default password = 123

– Save the Script and create a folder on the same level called „UltraVNC“
– Copy UltraVNC Programm Files to the UltraVNC folder
– Run vnc_deploy.ps1 (elevated, user has to be admin on the targeted client)

 

The ACL part is variable if you use it in an Domain environment. Start uvnc_settings.exe and configure Domain Access with groups or edit the *ultravnc.ini and change to:

[ultravnc]
passwd=000000000000000000
passwd2=000000000000000000
[admin]
UseRegistry=0
MSLogonRequired=1
NewMSLogon=1

And change acl.txt

Download Script, VNC, PSexec

#PowershellScript vnc_deploy.ps1:

# Administrator Privilige needed for Execution Policy Change
Set-ExecutionPolicy RemoteSigned

write "---------------------------------------------"
write "VNC Remote Access"
write "---------------------------------------------"
write "(1) Connect without permission(1)"
write "(2) Ask user for permission (2)"
$q = read-host "(1/2)"
switch ($q)
{ 
"1" {
$Hostname_PS = read-host "Enter hostname"
write "---------------------------------------------"
write "Install VNC on remote host"
write "---------------------------------------------"
copy-item UltraVNC\ -dest \\$Hostname_PS\c$\vnc -recurse
write "Assigning Config"
copy-item \\$Hostname_PS\c$\vnc\NOprompt_ultravnc.ini -dest \\$Hostname_PS\c$\vnc\ultravnc.ini -recurse
psexec \\$Hostname_PS C:\vnc\winvnc.exe -service loadinf=C:\vnc\NOprompt_ultravnc.ini
write "VNC copied to $Hostname_PS "
write "---------------------------------------------"
write "Assign security settings"
psexec \\$Hostname_PS C:\vnc\MSLogonACL.exe /i /o C:\vnc\acl.txt
write "starting VNC service"
psexec \\$Hostname_PS C:\vnc\winvnc.exe -install
start-sleep -s 5
write "---------------------------------------------"}
"2" {
$Hostname_PS = read-host "Enter hostname"
write "---------------------------------------------"
write "Install VNC on remote host"
write "---------------------------------------------"
copy-item UltraVNC\ -dest \\$Hostname_PS\c$\vnc -recurse
write "VNC copied to $Hostname_PS"
write "---------------------------------------------"
write "Assigning Config" 
copy-item \\$Hostname_PS\c$\vnc\prompt_ultravnc.ini -dest \\$Hostname_PS\c$\vnc\ultravnc.ini -recurse
psexec \\$Hostname_PS C:\vnc\winvnc.exe -service loadinf=C:\vnc\prompt_ultravnc.ini

write "Assign security settings"
psexec \\$Hostname_PS C:\vnc\MSLogonACL.exe /i /o C:\vnc\UltraVNC\acl.txt
write "Starting VNC service"
psexec \\$Hostname_PS C:\vnc\winvnc.exe -install
start-sleep -s 5
write "---------------------------------------------"}}


write "Connecting to $Hostname_PS"
& UltraVNC\vncviewer.exe -connect $Hostname_PS -quickoption 7
write "---------------------------------------------"
write "---------------------------------------------"
write "---------------------------------------------"
write "---------------------------------------------"
$Pause = read-host "Enter any to uninstall VNC"
write $Pause
psexec \\$Hostname_PS C:\vnc\winvnc.exe -uninstall
start-sleep -s 5
Remove-Item \\$Hostname_PS\c$\vnc -recurse
write "---------------------------------------------"
2+

by ·Keine Kommentare

If you dont want to login with password everytime or you want to use autossh then you should think about Key Login or Key based authentication in SSH.

Generate SSH-Key:

ssh-keygen

by default they are saved here

/home/pi/.ssh/

 

pi@pi:~/.ssh $ ls -lart
insgesamt 16
drwxr-xr-x 20 pi pi 4096 Jän 3 18:47 ..
-rw-r--r-- 1 pi pi 390 Jän 3 18:47 id_rsa.pub
-rw------- 1 pi pi 1679 Jän 3 18:47 id_rsa
drwx------ 2 pi pi 4096 Jän 3 18:47 .

show content of generated file:

more id_rsa.pub
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDUs8HxOGrMjM72cf6vv952/qxZ3nOG+BJ9JRCF1JWX6c
JZiHQxce9gz/IZv02G5QL6KbPA5oy5bvNv7LFe25erFLle4rbixiCdKyQ3YjiJquz3R/9oMXYkF/HfJVE
GIYcSgXVF/oRBJbTiSZfG3ryiWgcqPu9zDNHtYHxLcwrzfffYIerDjR86TzXLux9Q+1WUz0MKV6nw5/
I/y9MF7dSo194J2H0qZhlbyf3QYZmC1b94YD7zAz6cayK3iIX1Q/Dra7OqD4v+jdkpkgpiyr1XoKodPo
RPQEYZHgKulwZpl71lqtOv+/oSyW+g+QomvbRXu9PqbXtbRThNQw4YfpiN pi@pi

Copy to remote machine (where you want to login without password)

vi /user/.ssh/authorized_keys

copy the content inside of this file.

SSH Connection to the host should now be possible without using password.

Makes also AutoSSH possible:

autossh -R 20000:localhost:22 root@domain.com

to connect from the other side:

ssh -p 20000 pi@localhost
4+