Technowine

Restricting FTP Users in a chroot-ed Jail:
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We can specify an explicit list of local users to
chroot to their home directories by specifying,
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This page is aimed at programmers new to the Open Source / Free Software world, who want to make a contribution, but aren’t sure where to start.
Open source is a development method for software that harnesses the power of distributed peer review and transparency of process. The promise of open source is better quality, higher reliability, more flexibility, lower cost, and an end to predatory vendor lock-in.
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Security-enhanced Linux (SELinux) is an implementation of a mandatory access control mechanism. This mechanism is in the Linux kernel, checking for allowed operations after standard Linux discretionary access controls are checked.

To understand the benefit of mandatory access control (MAC) over traditional discretionary access control (DAC), you need to first understand the limitations of DAC.
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Zombie process is a process observed in Unix/Linux operating system. Zombie process are those process which has finished execution but still have an entry in the process table. This entry for the zombie process is used by the parent to know about the exit status of its child .
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You must have done remote file sharing and remote logins. Have you ever thought that whether your communication over the channel  is   secure or not. If you are using tools/utilities like ftp , telnet then you are not secure. SSH acronym for Secure Shell enables you to have transfer over the network in the encrypted manner.

This is how SSH works:
When a user attempts for a remote login using SSH ,for the first time it prompts for the generation of keys. SSH uses asymmetric Encryption. Asymmetric encryption also allows for digital certificates.
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Root account in linux is the supreme account holding all the privildges to manage and configure  your system.

Sometimes non-root users wish to login into the root account but doesn’t have the password or in times some bad users change the root password which disables root-user to login ,hence he need to change the password for his account  and setup a new password

Here are the all steps to change/break  password for root in linux even if previous password is not known: Read the rest of this entry »

Grub is the linux default bootloader.

Setting up a password in grub is quite an easy task.you can set the password just at boot time to prevent anyone from logging into the system in any mode.

here is how to do it.

Enter the command line and type

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You may have encountered the error message:

Cannot open /dev/hda9 : device or resource busy

in linux many times..where /dev/hda9 is one of your partitions of your hard drive /dev/hda..and 9 is the partition number.

This can happen due to one of the following reasons:-

1.The device could be mounted somewhere.To fix this
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Now one can easily enjoy the desktop terminal services of a remote linux  machine easily on its own linux/Windows desktop.Vncviewer is    the answer to this.

So what is a vncviewer?

Vncviewer is a viewer(client) for virtual network computing.Vncviewer is an Xt-based client application for the VNC (Virtual Network  Computing) system. It can connect to any VNC-compatible server such as Xvnc or WinVNC, allowing you to control desktop environment  of a different machine.

It is relatively straightforward to display and access a Linux desktop from a system anywhere else on a network or the internet by using Virtual Network Computing (VNC). This can be achieved regardless of whether that system is running Linux, Windows or Mac OS X.. The more impressive thing about this is that it can be set up for free with only a little time and knowledge. Read the rest of this entry »

Sometimes one may find himself in dependcy resolution problem while installing rpm packages on linux. Yum(Yellowdog update manager) server is a viable solution to it which holds the repository of linux packages and allows users to take packages .Client can easily install packages with simple commands using the yum installer . Read the rest of this entry »