Setting Proxy in Gnome for yum
From bash shell in terminal
export http_proxy=http://proxy_ip_address:port
Saturday, December 12, 2009
Linux to Windows file share using samba
Objective is to share a folder called "Shaded_Folder" from linux such a way that it can be accessible to a user called "hnarsha" from windows XP
Step 1 : Make sure you have samba installed in your system
Step 2 : edit /etc/samba/smb.conf
add following lines
hosts allow = *
hosts deny = *
[Shaded_Folder]
path = /home/hnarsha
read only = yes
step 3 : save the file
Stap 4 : set the password for user hnarsha to access this file share
smbpasswd -a hnarsha
it will ask for new password and retype the password.
Step 5 : add users to access the file share
edit file /etc/samba/smbusers
add following lines -
root = administrator admin hnarsha
nobody = guest pcguest smbguest
save the file
step 6 : Restart Samba services ( Login as root if needed )
/sbin/service smb stop
/sbin/service smb start
To access this shared folder from windows machine
Start - > Run -> \ \ < hostname / ipaddress > \Shaded_Folder
Friday, November 27, 2009
The invisible dangerous thing !
How do you feel when some one standing behind you and watching you closely all the time when you are using your system ?
Keyloger :
A keylogger (also called as spy software/hardware) is a small program/hardware device that monitors each and every keystroke a user types on a specific computer’s keyboard.
A keylogger program can be installed just in a few seconds and once installed you are only a step away from getting the victim’s password.
How does it work ?
Once the keylogger is installed on a PC/Laptop, it starts operating in the background (stealth mode) and captures every keystroke of the victim on that PC.
Let’s take up a small example: The victim goes to a online banking site and types his “username” and the “password” in the respective fields to login. The keylogger silently records these keystrokes and stores them in the logs [Usually a encrypted file hidden inside your system]. These logs when opened up shows the captured “username” and “password” and will also tell you that they were typed in the particular web page. Thus the keylogger loads upon every startup, runs in the background and captures each and every keystroke.
Some keylogers are capable of sending emails to a account with all the keystrokes recorded.
How it gets installed ?
Interestingly, there are many ways -
A keylogger can be installed just like any other program. Just follow the screen instructions and you’re done.
It can be bundled with other software installers that usually comes as freewares, you get a software but you think, hey I got it for free ! But you pay for it later ! Remember not all of them but dont forget many of them !
Do I know about it’s presence ?
No. The victim will never come to know about the presence of the keylogger on his/her computer. This is because, once installed the keylogger will run in total stealth mode. Unlike other programs it will never show up in start-menu, start-up, program files, add/remove programs and task manager. So the victim can no way identify it’s presence on his/her PC.
How do I prevent it ?
Always have a very good Antivirus, Anti Spywares. Many people will think what if I dont have a antivirus or anti spyware installed on my system ? Why should I pay for it ? Guys, Just do it ! Specially if you connect your system to the public network !
Refrain from using publicly accessible systems when you are dealing with confidential things public systems include PCs kept in cyber cafe or internet browsing centers, or could be a shared internet browsing system kept for all in the corner of your office !
What is it capable of ?
1. Capable of sending recorded keystrokes thorugh email to a remote system !
2. Capable of taking screenshots at regular intervals and ftp the file to a remote system with out your knowledge.
3. Some of them can even send the files stored in your system to a remote computer. Files can include, your confidential data like back account details, email addresses, personal photos or any thing that a remote user wants from your system !
Who uses it ?
As I said in one of my previous postings in this blog, there are two types of user groups for every technology that was invented. One set of good people, other one set of hackers !
Good Ones include : Organisations like companies, school, collages etc to monitor employees or who ever is using the system.
Bad ones include : Hackers, who pretends to give you worldclass softwares for free !
and the third group ! believe me -
A doubtful- husband, wife, boy friend, girl friend or brother or sister or parents - To see with out your knowledge what you have done in that system ! You decide which category they belong to !
Read my another posting about Data Recovery and understand when you are using a system what are the things that you need to be aware of !
All the best ! trust me my blog does not have any thing of such kind :-)
2012 !
PS: Read the post below at your own risk !
SCIENTIFIC EXPERTS from around the world are predicting that two years from now, all life on Earth could well come to an end. Some are saying it’ll be humans that would set it off. Others believe that a natural phenomenon will be the cause. And the religious folks are saying it’ll be God himself who would press the stop button. The following are some likely arguments as to why the world would end by the year 2012.
Reason one: Mayan calendar
The first to predict 2012 as the end of the world were the Mayans, a bloodthirsty race that were good at two things -- building highly accurate astrological equipment out of stone and sacrificing virgins.
Thousands of years ago they managed to calculate the length of the lunar moon as 329.53020 days, only 34 seconds out. The Mayan calendar predicts that the earth will end on December 21, 2012. Given that they were pretty close to the mark with the lunar cycle, it’s likely they’ve got the end of the world right as well.
Reason two: Sun storms
Solar experts from around the world monitoring the sun have made a startling discovery. Our sun is in a bit of strife. The energy output of the sun is, like most things in nature, cyclic and it’s supposed to be in the middle of a period of relative stability. However, recent solar storms have been bombarding the earth with lot of radiation energy. It’s been knocking out power grids and destroying satellites. This activity is predicted to get worse and calculations suggest it’ll reach its deadly peak sometime in 2012.
Reason three: The atom smasher
Scientists in Europe have been building the world’s largest particle accelerator. Basically, its a 27 km tunnel designed to smash atoms together to find out what makes the universe tick. However, the mega-gadget has caused serious concern, with some scientists suggesting that it’s properly even a bad idea to turn it on in the first place. They’re predicting all manner of deadly results, including mini black holes. So when this machine is fired up for its first serious experiment in 2012, the world could be crushed into a super-dense blob the size of a basketball.
Reason four: The Bible says it
If having scientists warning us about the end of the world isn’t bad enough, religious folks are getting in on the act as well. Interpretations of the Christian Bible reveal that the date for Armageddon, the final battle between good an evil, has been set for 2012. The I Ching, also known as the Chinese Book of Changes, says the same thing, as do various sections of the Hindu teachings.
Reason five: Super volcano
Yellowstone National Park in United States is famous for its thermal springs and old faithful geyser. The reason for this is simple -- it’s sitting on top of the world’s biggest volcano and geological experts are beginning to get nervous sweats. The Yellowstone volcano has a pattern of erupting every 650,000 years or so, and we’re many years overdue for an explosion that will fill the atmosphere with ash, blocking the sun and plunging the earth into a frozen winter that could last up to 15,000 years. The pressure under the Yellowstone is building steadily, and geologists have set 2012 as a likely date for the big bang.
Reason six: The physicists
This one’s case of bog -- simple maths mathematics. Physicists at Berkely University have been crunching the numbers. They’ve determined that the earth is well overdue for a major catastrophic event. Even worse, they’re claiming that their calculations prove that we’re all going to die, very soon. They are also saying that their prediction comes with a certainty of 99 per cent; and 2012 just happens to be the best guess as to when it occurs.
Reason seven: Earth’s magnetic field
We all know the Earth is surrounded by a magnetic field that shields us from most of the sun’s radiation. What you might not know is that the magnetic poles we call North and South have a nasty habit of swapping places every 750,000 years or so -- and right now we’re about 30,000 years overdue. Scientists have noted that the poles are drifting apart roughly 20-30 kms each year, much faster than ever before, which points to a pole-shift being right around the corner. While the pole shift is under way, the magnetic field is disrupted and will eventually disappear, sometimes for up to 100 years. The result is enough UV outdoors to crisp your skin in seconds, killing everything it touches.
Source : http://www.merinews.com/article/the-world-will-end-in-2012-say-experts/139440.shtml
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