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ZShaolin: vim, nmap, git, rsync, ssh for Android

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Remember ZShaolin? Yep, its that Android ninja tool that gives you zsh and a whole bunch of command-line applications on your Android device, minus the need to root it. read more...
permapage | score:9492 | -finid, November 9, 2012

ssh: Use Linux as a SOCKS5 proxy

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Did you know you could use ssh to create a SOCKS5 server?

This article explains how to create a SOCKS5 server in 1 command and how to add ip-based access control to it via iptables and tcp forwarder. read more...
permapage | score:9261 | -pkrumins, May 7, 2010

Tutorial: Secure Chat with YTalk and SSH

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Encrypting your chat sessions with SSH.
Under normal conditions, when everybody trusts everybody else, YTalk, talk, ntalk, et cetera will work without any problems. Alas, I found the real world a little more difficult and disappointing. It turned out my buddies couldn't reach me because of firewalls. Either their firewall rules would block the UDP connection or my firewall rules would stop it. Then there was the issue of corporate firewalls and even the ISP who sometimes played the big brother by blocking certain ports for the protection of our Windows brethren. Rather than taking the time to reset my firewall to better rules and hoping my buddies could take the same effort for theirs, I opted for another approach: remote logging with SSH and using guest accounts expressly setup for the purpose.
read more...
mail this link | permapage | score:8799 | -Ray, February 19, 2003

Protect SSH from dictionary attacks with pam_abl

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Use pam_abl module to stop brute force attacks against your SSH server...
Practically all Unix and Linux servers run an SSH service to let administrators connect securely from remote locations. Unfortunately for security administrators, attacks on SSH services are popular today. In this article I'll show you how can you protect machines running SSH services from brute force attacks using the pam_abl plugin for SSH pluggable authentication modules (PAM).
read more...
permapage | score:8765 | -Ray, March 28, 2007

SSH over Tor

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How to encrypt your traffic with SSH and tunnel it through Tor for privacy and security...
For communicating anonymously on the Internet you use Tor. For secure communications, so that nobody can read your private information you use SSH. Combine both, and you have a secure and anonymous communication. In this hack, well show you how to use Tor to anonymize your SSH connections.
read more...
permapage | score:8737 | -Ray, June 4, 2007

sslh ssl/ssh multiplexer

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sslh accepts connections on specified ports, and forwards them further based on tests performed on the first data packet sent by the remote client.Probes for HTTP, SSL, SSH, OpenVPN, tinc, XMPP are implemented, and any other protocol that can be tested using a regular expression, can be recognised. A typical use case is to allow serving several services on port 443 (e.g. to connect to ssh from inside a corporate firewall, which almost never block port 443) while still serving HTTPS on that port. read more...
permapage | score:8601 | -gg234, January 9, 2013

Anyterm: Remote access without SSH

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Browser-based secure terminal access to remote systems...
Anyterm allows you to have secure terminal access to a server without needing any special software on a client machine beyond a Web browser. For example, with Anyterm you can open a terminal into your server from an Internet cafe. Because Anyterm uses a pseudo-terminal for communication with the shell, you can run most command-line tools from an Anyterm terminal running inside a Web browser.
read more...
permapage | score:8486 | -Ray, March 19, 2008

Tutorial: Kippo SSH Honeypot (CentOS 5.5)

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Kippo is a medium interaction SSH honeypot designed to log brute force attacks and, most importantly, the entire shell interaction performed by the attacker. Kippo is inspired, but not based on Kojoney. This tutorial shows how you can compile and install Kippo on a CentOS 5.5 server. read more...
permapage | score:8380 | -falko, April 3, 2011

Set up SSH with Public-Key Authentication

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This guide explains how to set up an SSH server on Debian Etch with public-key authorization (and optionally with disabled password logins). SSH is a great tool to control Linux-based computers remotely. It is safe and secure. read more...
permapage | score:8355 | -falko, March 30, 2008

Tutorial: Set up Kojoney SSH Honeypot on CentOS 5.5

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Kojoney is a low level interaction honeypot that emulates an SSH server. The daemon is written in Python using the Twisted Conch libraries. In computer terminology, a honeypot is a trap set to detect, deflect, or in some manner counteract attempts at unauthorized use of information systems. Generally it consists of a computer, data, or a network site that appears to be part of a network, but is actually isolated, (un)protected, and monitored, and which seems to contain information or a resource of value to attackers. This tutorial shows how you can compile and install an updated version of Kojoney on a CentOS 5.5 server. read more...
mail this link | permapage | score:8343 | -falko, October 4, 2010

Tutorial: Set up chrooted SSH/SFTP

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This tutorial describes how to give users chrooted SSH and/or chrooted SFTP access on Debian Squeeze. With this setup, you can give your users shell access without having to fear that they can see your whole system. Your users will be jailed in a specific directory which they will not be able to break out of. I will also show how to restrict users to SFTP so that they cannot use SSH (this part is independent from the chroot part of this tutorial). read more...
permapage | score:8340 | -falko, September 6, 2011

Secure NFS: Tunneling NFS over SSH

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The goal of this howto is building an NFS server that works on an SSH tunnel. This way all traffic between your hosts and the file server is encrypted and thus more secure. Normally you should enter a password every time you try to establish an SSH connection but since we could be mounting at bootup we will use ssh-keygen to create a keypair so we can login without entering a password. We will, however, limit that login session to executing just one command. read more...
permapage | score:8301 | -falko, September 28, 2006

SSHFS Tutorial: How to use the SSH filesystem

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This short and sweet article has the steps you need to set up and use sshfs.
SSHFS is a really nice piece of software, because it just makes your life just a bit easier. It can 'mount' a directory of a remote SSH server and you can use it as a normal directory.
read more...
permapage | score:8287 | -Ray, August 23, 2006 (Updated: March 24, 2007)

HPN-SSH: Multithreaded SSH

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This performance-enhanced SSH/SCP variant also dynamically allocates and sizes the receive buffers for substantial performance inprovement.
This cipher mode introduces multi-threading into the OpenSSH application in order to allow it to make full use of CPU resources available on multi-core systems. As the canonical distribution of OpenSSH is unable to make use of more than one core, high performance transfers can be bottlenecked by the cryptographic overhead.
read more...
permapage | score:8269 | -Ray, February 13, 2008

Opening SSH and HTTP ports with iptables

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How to use the command line to open ports on your iptables firewall under Linux.
I have to look this up from time to time, usually just after installing a new Linux system intended for use as a test server. There are GUI tools for configuring the firewall, but I usually leave the entire windowing system uninstalled.

By default, many Linux distributions will start up sshd and httpd, but you wont be able to connect to them over the network, since the ports will be blocked by iptables. The examples below are for Red Hat or CentOS (which is basically Red Hat), and may vary slightly betweenl distributions.
read more...
mail this link | permapage | score:8268 | -Ray, January 9, 2006

GDB and SSH Tunneling

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This article explains how to use GDB and ssh to debug remote processes on embedded systems. The same technique could be used to debug processes running behind firewalls.
Ever debugged a program remotely and felt like telling your computer where to go and how to get there? Hopelessly adding calls to printf() and recompiling as a steady string of explectatives flow from your over-caffeinated brain waves.

Fear not! Help is on the way.
(here are some wave prints) read more...
mail this link | permapage | score:8258 | -Curt Brune, June 13, 2006 (Updated: April 24, 2012)

sshguard: Security for OpenSSH

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Stop dictionary attacks against OpenSSH with sshguard...
OpenSSH provides a secure alternative to clear-text logins used by first-generation network protocols like Telnet and FTP. But it's not enough simply to use SSH instead of Telnet -- you have to use it wisely. If you use weak passwords with SSH, a brute force dictionary attack will reveal your secrets as easily as if your password were sent in clear text.
read more...
permapage | score:8247 | -Ray, March 9, 2007

SSHerminator: Split screen terminal and SSH client

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SSHerminator is a terminal emulator based on Terminator, with extra SSH features.The aim of this project is not to provide a standard, general use Terminal emulator, but an emulator that provides as rich an experience as possible while using SSH (that can also be used as a standard terminal).SSHerminator is a semi-fork of Terminator. We sync up with the Terminator code as often as possible, to get the best Terminator features, but include our SSH hacks. read more...
permapage | score:8245 | -gg234, February 20, 2009

Secure your VNC connection with SSH

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VNC stands for Virtual Network Computing. It is remote control software which allows you to view and fully interact with one computer desktop using a VNC viewer on another computer desktop anywhere on the LAN or Internet. The two computers don't even have to be the same type, so for example you can use VNC to view a Windows XP desktop at the office on a Linux or Mac computer at home.

Once you are connected, traffic between the viewer and the server is unencrypted, and could be sniffed by someone with access to the intervening network. Is security imported to you, we recommend tunneling the VNC protocol through some more secure channel such as SSH. This workshop describes how to connect from a Windows XP client to a Linux (OpenSuse 10.3) server via VNC and to tunnel this connection using SSH. read more...
mail this link | permapage | score:8230 | -fn-eagle, December 12, 2007

Restrict users to SCP and SFTP with Chrooted rssh on RHEL

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FTP is insecure protocol, but file-transfer is required all time. You can use OpenSSH Server to transfer file using SCP and SFTP (secure ftp) without setting up an FTP server. However, this feature also grants ssh shell access to a user.

In this article series we will help you provide secure restricted file-transfer services to your users without resorting to FTP. It also covers chroot jail setup instructions to lock down users to their own home directories (allow users to transfer files but not browse the entire Linux / UNIX file system of the server) as well as per user configurations. read more...
mail this link | permapage | score:8226 | -nixcraft, January 2, 2008
More articles...
Buy Art Online with a Free Return Policy

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VPS: Xen vs. OpenVZ

Space Tyrant: A threaded C game project: First Code

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Testing the Digital Ocean $5 Cloud Servers with an MMORPG

The Real Microsoft Monopoly

The Supreme Court is wrong on Copyright Case

Shadow.sh: A simple directory shadowing script for Linux

No, RMS, Linux is not GNU/Linux

Space Tyrant: Multithreading lessons learned on SMP hardware

Space Tyrant: A threaded game server project in C

Why software sucks

Tutorial: Introduction to Linux files

Why Programmers are not Software Engineers

Microsoft to push unlicensed users to Linux

Apple DIY Repair

Apple to Intel move no threat to Linux

MiniLesson: An introduction to Linux in ten commands

The life cycle of a programmer

Graffiti Server Download Page

Space Tyrant: A multiplayer network game for Linux

Scripting: A parallel Linux backup script

Programming Language Tradeoffs: 3GL vs 4GL

Linux dominates Windows

How to install Ubuntu Linux on the decTOP SFF computer

Hacker Haiku

Download: Linux 3D Client for Starship Traders

Missing the point of the Mac Mini

Linux vs. Windows: Why Linux will win

Mono-culture and the .NETwork effect

The short life and hard times of a Linux virus

Beneficial Computer Viruses

The Network Computer: An opportunity for Linux

 

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