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Password-Only Login for SSH and SCP
Public key authentication is very common way when we have to access remote Linux/UNIX servers. Normally, we add the public keys to the authentication agent on local side (e.g. by ssh-add), to simply the login process.
Filed in: Applications, Security
Antispam: Understanding SPF records
Email is an extremely powerful and valuable tool for netizen, but only when used in the right way. As such we fully support measures that aim to defend users from unwanted emails.
One way to do this is by participating in the Sender Policy Framework (SPF), which is an open standard method of allowing [...]
Filed in: Security, System Tuning
Prepare the RPM Building Environment
Some days ago, I posted some examples on the common usage of RPM. Now, this post describes a manual preparation of a RPM building environment. With the help of this environment, you can generate upated RPM packages and patch your RPM-based system from source code.
Filed in: Applications, Security
Ubuntu 9.10 Desktop Edition Released
This new release comes with GIMP 2.6, GNOME 2.28/KDE 4.3.2, Mozilla Firefox 3.5, OpenOffice.org 3.1, Linux kernel 2.6.31, X.Org 7.5, and the Empathy Instant Messenger instead of Pidgin. The Ubuntu One client, which interfaces with Canonical’s new online storage system, is installed by default. [...]
Life Cycle of Redhat Enterprise Linux
The Red Hat Enterprise Linux Life Cycle is designed to reduce the level of change within each major release over time increasing predictability and decreasing maintenance costs. Every major version of Red Hat Enterprise Linux is maintained and supported independently during the life cycle.
Filed in: Security, System Tuning
Clamav: Quick glance and exim integration
Clamav should be the best anti-virus software for linux, it’s widely used and frequently updated for security vulnerabilities. If your server allows some public groups to upload files or serves as mail server, it’s highly recommended to have a good antivirus installed, so that every of the [...]
Filed in: Security, System Tuning
Something about Clickjacking
Let’s watch a youtube video first: Clickjacking
As we see that, After playing a simple game, the player’s webcam got clickjacked.
Here is another video from Google video, New Zero-Day Browser Exploits -ClickJacking, which will show you a detailed descrtion about ClickJacking.
Filed in: Security
How to Implement P3P HTTP Headers for cross-site cookies
Posted by joseph on September 8, 2009 · 4 Comments
Why I need to make sure to implement P3P if using iframes or using cross-site cookies?
The point is that if your application is inside iframe with parent belongs to another domain – cookies will not work for some very common configurations, for example IE 6/7 with privacy set to medium. If cookies [...]
Filed in: Security, System Tuning
File system based ACL in Linux
Posted by joseph on July 8, 2008 · 2 Comments
If you require more controls on file permissions, ACL (a.k.a Access Control Lists) might be a nice choice. ACL goes beyond normal user-group based permission control and allow setting permissions on per individual user or group basis.
Filed in: Security, System Tuning
Bash shell fork() bomb
I just tried the famous shell fork() bomb on my Laptop, which is running Debian lenny. (I dare to do this because I’m going to shut down my laptop.) Please note that do NOT run it on your production server!
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Web Hosting: Netcat really owns it's title: the swiss army knife!...
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Hassan: I have an E1A14 Errror. Im new to servers, kindly tell what is...
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joseph: Welcome Eric! Your website makes a lot of sense, thank you!...
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Eric Hammond: I've listed the commands necessary for each step in this article ...
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