Monday, April 9, 2007

Aspnet_Regiis - Encrypt/Decrypt Web.config

Encrypting a Configuration Section
IIS/ASP.NET will not serve direct requests to Web.config, which protects possibly sensitive information (e.g. connection strings, email addresses) from the public...at least in theory.

You can further protect web.config information via encryption. Out of the box, the aspnet_regiis.exe utility will encrypt web.config according to your preferences.

Here is a sample <appsettings> section:

Assume that this application runs under http://localhost/myApp, we could run the following command to encrypt:

    aspnet_regiis -pe "appSettings" -app "/myApp"

After which, the <appsettings> section would look like this:


Implementing Code to Retrieve Configuration Settings
What's great is that the code that accesses the configuration settings need not change, e.g.:
    string strGUID = ConfigurationSettings.AppSettings["ROOTGUID"];

...would work before and after encryption.

Decryption
To decrypt the configuration settings, just substitute a "-pd" switch for "-pe":

    aspnet_regiis -pd "appSettings" -app "/myApp"

...Finally, I came across a good article about handling this encryption/decryption programmatically (e.g. via an ASP.NET page or a Console App). Here's the 4gfr link.

16 comments:

ken zip-s-place-a-t c-o-m-c-a-s-t d-o-t-n-e-t said...

two questions ??
1: What version of Dot NEt is this for ?
2: If you can decrypt with that command - then so can anyone who gets the file..am I correct ?

Anonymous said...

1: 2.0 and forward
2: No, you need the crypto container residing in your computer as well

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