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Chapter 7. Security in Tcl Scripts

Chapter 7. Security in Tcl Scripts

This chapter covers the following topics:

From the early days of programming, those with nefarious intent have attempted—and in many cases successfully integrated—additional code into programs that have caused serious consequences to the unsuspecting user. Because a Tcl script is a program running on an IOS-based device, additional code added to the script could potentially send passwords via e-mail, erase the saved configurations or IOS images, cause the device to reload periodically, and so on. The capability to protect scripts against this type of attack is paramount!

Cisco IOS Software Release 12.4(15)T introduced a new feature to improve security for Tcl scripts. The purpose of this security feature is to provide a method for signing a Tcl script that proves the script has not been modified since the time it was signed by the author. It relies on techniques and methods of existing public key cryptography libraries.

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