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White list validation is appropriate for all input fields provided by the user.White list validation involves defining exactly what IS authorized, and by definition, everything else is not authorized.It is always recommended to prevent attacks as early as possible in the processing of the user’s (attacker's) request.Input validation can be used to detect unauthorized input before it is processed by the application.Input validation is performed to ensure only properly formed data is entering the workflow in an information system, preventing malformed data from persisting in the database and triggering malfunction of various downstream components.Input validation should happen as early as possible in the data flow, preferably as soon as the data is received from the external party.
then the developer should be able to define a very strong validation pattern, usually based on regular expressions, for validating such input.
Data from all potentially untrusted sources should be subject to input validation, including not only Internet-facing web clients but also backend feeds over extranets, from suppliers, partners, vendors or regulators, each of which may be compromised on their own and start sending malformed data.
Input Validation should not be used as the primary method of preventing XSS, SQL Injection and other attacks which are covered in respective cheat sheets but can significantly contribute to reducing their impact if implemented properly.
It is very difficult to validate rich content submitted by a user.
For more information, please see the cheatsheet on Sanitizing HTML Markup with a Library Designed for the Job.
Input validation can be implemented using any programming technique that allows effective enforcement of syntactic and semantic correctness, for example: , where the ' character is fully legitimate.