Securing a web application.

Hello,

I have written a little ISAPI dll that reads a document database and returns a document as a PDF by setting the reponse stream to the document.

It is very simple and works fantastically.

However i need to secure it so that not everyone can just type in the url and read a document.

Any suggestions?
soozhCEOAsked:
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Ray PaseurCommented:
The general design for client authentication is given in this article.  If you're not using PHP, choose the language you like and make a Google search for "[language] client authentication."  A good answer will almost certainly appear in the top one or two pages of search results.
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_2391.html
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btanExec ConsultantCommented:
Probably I see it as defense in depth where you harden from network, web and down to data layer. In this case, server hardening is good start like use of iis  and urlscan http://technet.microsoft.com/en-us/library/cc731278(v=ws.10).aspx

Check out url authorization and restrict of isapi
 http://technet.microsoft.com/en-us/library/cc772206(v=ws.10).aspx
 http://technet.microsoft.com/en-us/library/cc730912(v=ws.10).aspx

Overall, owasp cheatsheets are good resource to leverage further hardening of the web codes e.g. defense against force browsing and i see data leakage as a key concerned as well
 https://www.owasp.org/index.php/Cheat_Sheets
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Shalom CarmelCTOCommented:
You can secure it by basic authentication in IIS.
The actual implementation depends on your environment (AD/domain/IIS version), here is how it is done in IIS 6.

http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/abbca505-6f63-4267-aac1-1ea89d861eb4.mspx?mfr=true
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