Pro PHP Security: From Application Security Principles to the Implementation of XSS Defenses, Second Edition

Working with SSH

Unlike SSL, Secure Shell (SSH) is most commonly used to secure connections for administrative purposes.

Secure Shell will forward either a command line or a window from a remote host to a client, by means of which you can interact with that remote host as if you were physically present. Think of it as a console interface to the world, and you'll have some idea of its potential. A Secure Shell client suite typically includes support for a command shell, file transfer, network port forwarding, and X11 window forwarding capability. We will cover all of these topics in this section. PHP's PECL extension library has the ability to speak SSH2, and we will show you some ways to use it for accomplishing system administration tasks on ...