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May 22
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- setup vmware tools on your guest OS
- on the Host OS, go into the .vmx file for your virtual server and add or edit:
tools.syncTime = “TRUE”
time.synchronize.continue = “TRUE”
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May 19
|
By default, Iptables log message to a /var/log/messages file. However you can change this location. I will show you how to create a new logfile called /var/log/iptables.log. Changing or using a new file allows you to create better statistics and/or allows you to analyze the attacks.
Procedure to log the iptables messages to a different log file
Open your /etc/syslog.conf file:
# vi /etc/syslog.conf
Append following line
kern.warning /var/log/iptables.log
Save and close the file.
Restart the syslogd (Debian / Ubuntu Linux):
# /etc/init.d/sysklogd restart
On the other hand, use following command to restart syslogd under Red Hat/Cent OS/Fedora Core Linux:
# /etc/init.d/syslog restart
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May 19
|
Plesk disables the ‘root’ account when Plesk is installed. To get root privileges please login with the ‘admin’ username. The password is the same as the admin’s password in Plesk.
You can find it in /etc/psa/.psa.shadow.
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May 14
|
First you must create your VPN connection in Windows (XP, 2000 or later) using the standard wizard thingy Windows provides. Let’s say your connection is named “My vpn”.
I assumed that my intranet is giving me an address always starting with ”192.168.100″ and I want to add route to 10.10.10.0/24 to my VPN gateway.
Now let’s start our script in a .bat file:
@rasdial /disconnect
@rasdial “My vpn” “MyUser” “MyPassword”
@setlocal
@for /f “tokens=1-2 delims=:” %%i in (‘ipconfig ^| find “IP Address” ^| find “192.168.100″‘) do set GETIP=%%j
@route add 10.10.10.0 mask 255.255.255.0 %GetIp%
@endlocal
After you’re done creating the .bat file, simply create a shortcut to it and put it on your desktop. This way you can doubleclick it, connect and start surfing your Intranet
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May 09
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- Logged in as root, check which timezone your machine is currently using by executing `date`. You’ll see something like
Mon 17 Jan 2005 13:19:11 PM PST, PST in this case is the current timezone. - Change to the directory
/usr/share/zoneinfohere you will find a list of time zone regions. Choose the most appropriate region, if you live in Romania this directory is the “Europe” directory. - If you wish, backup the previous timezone configuration by copying it to a different location. Such as
mv /etc/localtime /etc/localtime-old
-
Copy file with your zone to /etc/localtime .
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May 07
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Securely delete a file called /tmp/login.txt:
shred -u /tmp/login.txt
You can add a final overwrite with zeros to hide shredding:
shred -u -x /tmp/login.txt
Where,- -u : Remove file after overwriting
- -x : Add a zero to hide shredding
- -n NUM : Overwrite NUM times instead of the default 25
Shred a multiple files
Let us say you have 100 subdirectories and just wanted to get rid of all files:
find -t f . -exec shred -u '{}' \;
Run shred on entire partition
shred -n 30 -vz /dev/hdb2
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May 07
|
#!/bin/bash
HOME_BASE=”/home/” #set your home base directory
SHELL=”/bin/bash” #set shell for users
#checking if you are root
if [ $(id -u) -eq 0 ]; then
read -p “Username:” USER
read -s -p “Password:” PASSWORD
egrep -w “^$USER” /etc/passwd >/dev/null
if [ $? -eq 0 ]; then
echo -e “\n$USER exists!\n”
exit 1
else
PASS=$(perl -e ‘print crypt($ARGV[0], “password”)’ $PASSWORD)
useradd -p ${PASS} -s $SHELL -m -d ${HOME_BASE}${USER} ${USER}
[ $? -eq 0 ] && echo -e “\nUser has been added to system!\n” || echo -e “\nFailed to add a user!\n”
fi
else
echo -e “\nOnly root may add a user to the system\n”
exit 2
fi
save it like script.sh and run it with: ./script.sh
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