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Securing an ASP.Net application...

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  link to register.aspx for users who require the facility.

Alternatively you can have multiple web.config files, with that for a sub-directory overriding that for the application a whole, an approach that we shall implement later for completeness.

Finally, you may also perform forms authentication in ASP.Net against a Web Service, which we won’t consider any further as this could form an article in itself, and against Microsoft Passport. Passport uses standard web technologies such as SSL, cookies and javascript and uses strong symmetric key encryption using Triple DES (3DES) to deliver a single sign in service where a user can register once and then has access to any passport enabled site.

Consideration of suitability
Forms based authentication is a flexible mechanism supporting a variety of techniques of various levels of security. Some of the available techniques may be secure enough for implementation if extended appropriately. Some of the techniques are more suited to our problem domain than others, as we’ll discuss shortly.
In terms of specific authorities:

Passport is most appropriately utilized where your site will be used in conjunction with other Passport enabled sites and where you do not wish to maintain your own user credentials data source. This is not the case in our chosen problem domain where Passport would both be overkill and inappropriate.

SQLServer would be the correct solution for the most common web site scenario where you have many users visiting a site where the majority of content is protected. Then an automated registration facility is the obvious solution with a configuration as per the web.config file just introduced. In our chosen problem domain we have stated that we potentially have only a handful of users accounts accessing a small portion of the application functionality and hence SQLServer is not necessarily the best solution, though is perfectly viable.

Use of the credentials section of the forms element of web.config or a simple text/ XML file would seem most suitable for this problem domain. The extra security and simplicity of implementation offered by the former makes this the method of choice.

Authorization via ASP.Net
As discussed earlier this is the second stage of gaining access to a site: determining whether an authenticated user should be permitted access to a requested resource.
File authorization utilizes windows security services access control lists (ACLs) – using the authorized identity to do so. Further, ASP.Net allows further refinement based on the URL requested, as you may have recognized in the examples already introduced, as well as the HTTP request method attempted via the verb attribute, valid values of which are: GET, POST, HEAD or DEBUG. I can't think of many occasions in which you'd want to use this feature but you may have other ideas! You may also refer to windows roles as well as named users.

A few exam

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