OpenSSH

From Gentoo Linux Wiki

SSH Basics OpenSSH X-forwarding Using host keys Passwordless Login Use ssh-agent for secure passwordless login Windows with SSH openssh with keys and S/Key HOWTO VPN over SSH and tun Tips & Tricks autossh keychain Reverse Tunnel Protect sshd w/ Swatch Protect sshd w/ DenyHosts Protect sshd w/ IP Tables Protect sshd w/ sshdfilter Protect sshd w/ fail2ban Distcc over SSH Other Gentoo-wiki SSH edit

[edit] Introduction

OpenSSH is a powerful set of tools including ssh, sshd, scp, and sftp. The purpose of ssh, or Secure Shell, is to have secure, encrypted remote access to another machine.

What can you do with ssh?

• Log into your home PC from school, work, the library, etc from any major operating system.
• Using nautilus or konquerer graphically browse through files remotely.
• Tunnel sensitive information over an encrypted channel.
• Tunnel data or create a listening service even through restrictive firewalls.

[edit] Enable SSH

ssh is installed on Gentoo by default, however it is not enabled. You can start the daemon by issuing /etc/init.d/sshd start or add it as a default daemon on every startup rc-update add sshd default.

WARNING: You should do some initial configuration before starting ssh - especially if you are not firewalled. Mac OS X and many Linux systems are vulnerable Out-of-the-Box because ssh is configured with lax settings. A cracker could run an outrageous attempt of 1000 logins per minute and brute force your password with a dictionary attack. Running Linux may make your system bullet-proof, but how can it do any good if the zipper is down on your kevlar vest, y'know? Securing SSH is covered in the GWikInstall guide. Of course you could just use long passwords of random characters that cannot be guessed by a dictionary or brute force attack before the sun goes nova and turns the Earth into a big lump of charcoal.

[edit] Basic SSH

Getting started with SSH

• Installing OpenSSH
• SECURITY SSH without a password
• TIP keychain
• HOWTO X-forwarding
• TIP SSHD Host Keys

[edit] Tips & Tricks

Little ways ssh can make your computorial life more convenient

• autossh
• Reverse tunneling
• Protecting with swatch
• Distcc over ssh with portage

[edit] Secure shell on Windows

Please refer this wiki page on The Windows Documentation Project for information on how to set up ssh on windows. This gives you a windows shell prompt through which it is possible to do admininistrative local and domain tasks such as restarting printer spools and joining a domain.

[edit] Other

Can't find what you're looking for? Since 3-letter searches are ignored by MySQL you'll have to google the gentoo-wiki for other SSH pages.

BTW, If you come across a SSH artcle which does not have this header, please add {{OpenSSH}} to it. :-D