SSH Mastery: OpenSSH, PuTTY, Tunnels and Keys
Michael W Lucas
Format: PDF / Kindle (mobi) / ePub
Secure Shell (SSH) lets systems administrators securely manage remote systems. But most people only use the bare minimum SSH offers. Used properly, SSH simplifies your job and improves security.
This book saves you from sifting a decade of obsolete online tutorials and quickly gets you running:SSH with the OpenSSH server and the PuTTY and OpenSSH clients. You will:
* Eliminate passwords.
* Manage access to your SSH server by users, groups, addresses, and more
* Securely move files around your network
* Forward graphic displays from one host to another
* Forward TCP/IP connections
* Centrally manage host keys and client configurations
* Use SSH as a secure transport for other applications
* Secure applications run over SSH
* Build Virtual Private Networks with OpenSSH
And more! This book quickly and painlessly simplifies life for anyone using SSH.
/home/pkdick, and he is chrooted into /usr/prisonroot, you must create the directory /usr/prisonroot/home/pkdick. This directory should be owned by the user, just like a regular home directory, and should contain any necessary dotfiles. Create device nodes inside a dev directory inside the chroot. With a chroot directory of /usr/prisonroot, you would need /usr/prisonroot/dev. The method to create device nodes varies between operating systems. OpenBSD and many Linuxes use the shell script
another service that you configure). The most popular SSH server is OpenSSH's sshd. SSH Clients You use an SSH client to connect to your remote server or network device. The most popular SSH client for Windows systems is PuTTY, while the standard SSH client for Unix-like systems is ssh, from OpenSSH. Both clients are freely available and usable for any purpose, commercial or noncommercial, at no cost. We'll cover both. SSH Protocol Versions The SSH protocol comes in two versions, SSH-1
run with the agent. If your console supports multiple virtual terminals (i.e., any BSD, Linux, etc), the SSH agent will only work for the process environment where you ran these commands. Another virtual terminal won't be able to access the agent; it will require its own SSH agent. If you have multiple keys with the same passphrase, automatically decrypts all of the keys. If the keys have different passphrases, ssh-add prompts you for each passphrase separately. ssh-add Using Nonstandard Key
cannot view the file. Save the file with a .pub extension. Now save the private key. I strongly recommend using the same file name for the public and private keys. PuTTYgen uses a .ppk extension for private keys, so they won't overwrite each other. For example, the key files I use in my day job are named mwlucas-work-20101114.pub and mwlucas-work-20101114.ppk. You now have a public key. Congratulations! The key is stored in a format used by Pageant and PuTTY. This is different than the format
-R remoteport:localIP:localport hostname I want to connect port 2222 on SSH server pride to port 22 on the SSH client, using the localhost address on both sides, so I run: $ ssh -R 2222:localhost:22 pride My client connects to the SSH server and gives me a command prompt. As long as that SSH session remains open, another user on pride could SSH to my workstation by running: $ ssh -p 2222 localhost Poof! A new SSH connection into the client. It's best to not have random untrusted users on the