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Chroot users with OpenSSH: An easier way to confine users to their home directories

With the release of OpenSSH 4.9p1, you no longer have to rely on third-party hacks or complicated chroot setups to confine users to their home directories or give them access to SFTP services. Vincent Danen tells you how to take advantage of this new addition to OpenSSH. by Vincent Danen

Tags: SFTP, OpenSSH, Home Directory, Vincent Danen

Blog posts 2008-06-24

Realize the flexibility of OpenSSH

OpenSSH is one of the most useful tools available. With it, you can access systems remotely and securely, transfer files securely (using scp, sftp, or even rsync over ssh), execute single commands on remote systems, secure normally insecure services, and much more. Most people make use of...

Tags: Remote System, SSH, OpenSSH, Vincent Danen

Blog posts 2008-06-10

Find and fix weak OpenSSL/OpenSSH keys: Debian-based Linux vulnerability

A recent vulnerability was found in the OpenSSL package as provided by Debian and Debian-based Linux distributions, such as Ubuntu, that broke the effectiveness of the OpenSSL PRNG Predictable Random Number Generator. This vulnerability caused OpenSSL to generate weak keys for anything relying on OpenSSL, including SSL certificates, OpenSSH keys,...

Tags: OpenSSL, Linux, Perl, Vulnerability, Debian, OpenSSH, Debian Team, Ssl/Tls, Operating Systems, Open Source, Security, Software, Vincent Danen

Blog posts 2008-05-19

Use OpenSSH as a secure Web proxy

Making sure your computers are secure is, in some respects, a full-time job. It gets even more complicated when you have to worry about wireless security too. An important concern for travelers who use wireless networks in their travels -- whether they are using the wireless access...

Tags: Web, Network, IP, Server, IP Address, OpenSSH, Firewalls, Network Security, Networking, Network Technology, Security, Chad Perrin

Blog posts 2008-02-17

Specify who can log in via OpenSSH

Great tip! Thanks alot.Thanks for these nice informations. i didn't know it was possible to restrict users by IP/networks. I usually do this by firewall rules, but adding it into sshd_config is another line of defense.I would like to add the tip that one can usually acieve similar results by...

Tags: OpenSSH, oliver@..., administrator, SSH

Discussion threads 2007-11-13

Specify who can log in via OpenSSH

The OpenSSH suite of tools, developed by the OpenBSD Project, includes popular programs that serve many uses. This popularity combined with ssh availability as both server and client on just about every OS makes it no wonder that ssh has been the target of common attacks; and as a result,...

Tags: SSH, OpenSSH, AllowUsers, Vincent Danen

Blog posts 2007-11-09

Protect SSH from brute force password-cracking attacks

In the midst of ensuring you don't have any unnecessary services running while securing a Unix-like system from outside attacks -- whether a proprietary UNIX system, a free BSD Unix system, or a Linux distribution -- one of the services you'll almost certainly come across is the SSH daemon. ...

Tags: Password, SSH, Unix, OpenSSH, Attack, Security, Chad Perrin

Blog posts 2007-10-30

Happy birthday, OpenSSH

I'm sure some of you have noticed by now that this month marks Google's 9th birthday. It's something of a landmark event for a number of reasons, not least of which is the incredible impact Google has had on the IT industry. More relevant to security, however...

Tags: SSH, OpenSSH, Remote Access, Chad Perrin

Blog posts 2007-09-27

10 things to look for in a remote connectivity application

quite possibly the best available toolOpenSSH coupled with the X Window System's network transparency for when GUI access is necessary may be the best tool available to meet all those needs. There is not a single item on that list of ten criteria that is not handled admirably well...

Tags: PRODUCTIVITY, Remote access, UNIX, Operating systems, OPEN SOURCE, apotheon, OpenSSH, tool

Discussion threads 2007-06-28

Can't connect to Openssh after reboot

I tried a method to using my home internet connection at work. I know port 22 is open at work, and I setup openssh and whatnot, and it worked last week. The only thing that happended to the computer was a reboot, and ever since then I can't connect to...

Tags: browncoatz@..., OpenSSH

Discussion threads 2007-06-28

How do I... Create secure tunnels for client-server communication with OpenSSH?

OpenSSH and MAC OS X Terminalanyone tried this with the MAC Terminal util?SSH on MACI haven't use OpenSSH persay on a MAC. But I have used the already availabe ssh on the MAC to connect to my personal PC at home. Just use the commands that you would on a...

Tags: Demo_Dog, client-server, MAC, OpenSSH, SSH

Discussion threads 2007-06-13

OpenSSH service won't start on Vista

Hi,I am trying to install OpenSSH on Windows Vista. I log in as member of Adminstrator and install the package. Vista UAC does not give me Consent prompt but it give me a dialog saying unknown application is trying to get install on the system, probably because the installer is...

Tags: Microsoft Windows Vista (Longhorn), mindreleams@..., OpenSSH, Microsoft Windows Vista, compatibility mode

Discussion threads 2007-06-06

How do I... Create secure tunnels for client-server communication with OpenSSH?

Takeaway:OpenSSH offers a suite of tools for secure client-server communication, including the ability to create secure "tunnels" for any kind of client-server communication, including checking/sending e-mail or Web browsing. This How do I... introduces you to OpenSSH's secure tunneling capabilities, by demonstrating how the program can be used to...

Tags: Security, Open Source, Networking

Blog posts 2007-05-21

Vista: Windows XP with a better theme installed?

New Vista Business installationI've been using Vista Business for two weeks now, and must admit that I am pretty impressed. I installed in on a spare hard disk and kept my old XP disk in the drawer just in case. To date, I've installed the following, and they work a...

Tags: Microsoft Windows Vista, Microsoft Windows XP, paul@..., openssh, pspad, windows, winscp, Microsoft Windows

Discussion threads 2007-02-26

OpenSSH login tricks

ssh shortcutsThanks for that article. I appreciate learning more about the basic tools I use in Linux. Especially shortcuts.Veyr useful trickIndeed, quite a cool trick the one that you provided.If any use, I'd like to suggest PuTTY and pagent, a great SSH client and key agent (avoid retyping passwords all...

Tags: jim-s@..., SSH, software, linux, networking, OpenSSH

Discussion threads 2007-02-06

OpenSSH login tricks

Vincent Danen is a fan of OpenSSH for remote connections. Here, he shares some tricks for streamlining remote access to systems using SSH. OpenSSH is a fantastic tool with a great variety of options and tricks available if you're creative enough to figure them all out. For ...

Tags: SSH, OpenSSH, Vincent Danen, remote system, Linux Tips Newsletter

Technical articles 2007-02-02

Making the switch: Searching for software

Would youmind explaining what the program names nand acronyms you use are?Looks a good article, but it is all Greek to me.WTF is a keychain?Abiword I know from Linux, but what are the rest?thankssome helpA "keychain" applicatio

Tags: feedback, Kiltie, mac, off-topic, SCP, SFTP, software, SSH

Discussion threads 2006-10-26

Linux 101: Establish more effective security capabilities with OpenSSH

Linux 101: Establish more effective security capabilities with OpenSSHarticle rootSSH implementationThe downloadable version of this article is available here:http://downloads.techrepublic.com.com/abstract.aspx?docid=240667What is your current choice for SSH implementation? How important is SSH to your organization?I've noticedmost distros tend to have ssh configured to allow root login and to forward xsession data by...

Tags: SSH, linux, apotheon, linux 101, chad perrin, Mark W. Kaelin, programming, OpenSSH, authentication, security

Discussion threads 2006-07-21

Linux 101: Establish more effective security capabilities with OpenSSH

LongtimeLinux admins know that SSH,the "Secure Shell" protocol, is one of themost handy and potentially critical utilities in their software toolbox. Usingmultiple terminal emulators in an X Windows environment on a workstation, orvia the Screen utility, a sysadmin for Linux or otherUnix-based OS servers can manage several systems simultaneously with...

Tags: Chad Perrin, Linux, OpenSSH, security, SSH

Technical articles 2006-07-21

OpenSSH vulnerability poses critical threat to servers

A vulnerability in OpenSSH has been discovered that can lead to the complete compromise of many Linux/UNIX systems. Even worse, it appears that hackers have known about this vulnerability and have been exploiting it for as long as several months.DetailsCERT advisory CA-2003-24, “Buffer Management Vulnerability in OpenSSH,” indicates that exploiting...

Tags: CERT, John McCormick, OpenSSH, Sendmail Inc., server, vulnerability

Technical articles 2003-09-29