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Encrypting Connection Strings in web.config file
ASP.NET stores all the configuration information in plain text files called web.config and machine.config files. We store all vital information including database connection strings, user names, passwords for the databases. Thus you end up storing all sensitive information in vulnerable plain text files which is nothing but security compromise.
Taking a clue, Microsoft has provided the capability to encrypt sensitive information in configuration files including connection strings in ASP.NET 2.0. With this new capability you can easily encrypt sections of configuration files which makes your application secure.
This new capability brings it with performance overhead that occurs when you encrypt or decrypt sections of web.config files. So use it sparingly. That means be judgmental and judicious when you decide to encrypt data.
ASP.NET 2.0 introduced Protected Configuration model that allows you to encrypt data using two Protected Configuration Providers. They are:
Let's explore this new capability of encrypting and decrypting of connection strings in web.config files using above two providers available in ASP.NET 2.0.
Take web.config file which contains valid connection string from some existing project. Bellow is an example of configuration section.
You can observe <connectionStrings> section in above sample which contains connection string information.
Add new form to your existing project and add the below method EncryptConnString() to code behind of the form. We will use RSAProtectedConfigurationProvider model to encrypt the connection strings. We will try to analyze this magic piece of code. Let's start with namespaces. The System.configuration namespace contains classes which deal with the configuration information associated with client applications and ASP.NET applications. The System.Web.Configuration.WebConfigurationManager class is the preferred way to provide programmatic access to configuration files of ASP.NET web applications. You can use one of open methods provided by WebConfigurationManager that return configuration object which in turn provides the required methods and properties to handle the underlying configuration files. The GetSection method of configuration object returns the connectionStrings section object for the web.config file.
Encrypting Connection string using RSAProtectedConfigurationProvider model
You can observe in below listing that connectionStrings section is encrypted when we execute above method using RsaProctectedConfigurationProvider model.
Similarly, we can encrypt connectionStrings information using DataProtectionConfigurationProvider model. Use the same above method and replace parameter for ProtectSection method with DataProtectionConfigurationProvider as shown below.
Encrypted Connection String using DataProtectionConfigurationProvider
You can in the similar way decrypt connection strings information using below method.
Remember, we cannot encrypt all sections of web.config file using this above programmatic approach. There are few sections which need some additional steps before we can encrypt them with above approach.
In order to encrypt these configuration sections you must encrypt the value and store it in the registry. There's an aspnet_setreg.exe command-line tool to help along with this process.
Encryption/Decryption using aspnet_regiis.exe command line tool
You can also encrypt and decrypt sections in the Web.config file using the aspnet_regiis.exe command-line tool, which can be found in the <WINDOWSDIR>\Microsoft.Net\Framework\version directory. To encrypt a section of the Web.config using the DPAPI machine key with this command-line tool, use following command.
aspnet_regiis.exe -pe "connectionStrings" -app "/YourWebSiteName" â€“prov "DataProtectionConfigurationProvider"
To decrypt connectionStrings section using this tool, you can specify following command in aspnet_iisreg.exe tool.
aspnet_regiis.exe -pd "connectionStrings" -app "/YouWebSiteName"
Even though, ASP.NET is configured to reject all HTTP requests for resources with .config extension, but, if the malicious user gains access to web server's file system then sensitive information in configuration file will be disclosed. Fortunately, ASP.NET 2.0 mitigates this problem by introducing encryption schemes for configuration files. You can either encrypt/decrypt configuration files including Web.config and Machine.config either programmatically or using aspnet_regiis.exe tool.
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