Linux - SecurityThis forum is for all security related questions.
Questions, tips, system compromises, firewalls, etc. are all included here.
Welcome to LinuxQuestions.org, a friendly and active Linux Community.
You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today!
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in.
If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here.
Having a problem logging in? Please visit this page to clear all LQ-related cookies.
There is less than 12 hours left to vote in the 2015 LinuxQuestions.org Members Choice Awards. Click here to go to the polls. Vote now and make sure your voice is heard!
Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
Click Here to receive this Complete Guide absolutely free.
I've been messing around (hey, Sunday morning, not shaved, still in wrinkles of last night, mug of steaming hot Java - eh you get the picture) with the firewall and found ssh at port 22 to be among the trusted services. These is an SSHD listening to port 22 as well...
Do I need this? I read that ssh is needed to log on remotely. I don't want THAT to happen (eek) to me! If I uncheck this, will I be able to log back in from console 0 - the keyboard.
Maybe you installed it "by accident", some (many) distributions don't install such services unless you specifically want to, because of what you said (it's a potential hole and totally unnecessary if you don't use it). A "full install" or "install everything" option might pull that in of course, and if you've done something like that, check the other services you might be running to see if there are others you don't need (httpd/apache, mail server, ...)
The client (openssh-client) is all you need if you connect to remote servers yourself; server (openssh-server) is needed if you (or somebody else) need(s) to connect to your machine remotely. On some distributions there may be a metapackage (for example called just "ssh") that pulls in both the client and server, so that's a third way to accidentally get it.
Big tnx! It felt like a (huge) security hole...so, why not plug it? I don't need to access or have accessed my machine remotely at all...
So, click, turned off and tnx!
I wouldn't really call it a "security hole" as such the protocol is generally pretty secure. Yes, it does give an attack point to the outside world but if your passwords (and/or ssh key passphrases) are secure enough then you should be fine. But like you said, if you have no need for it, there's no point it running!