c# validate gtin Encryption with a Security Token in C#.NET

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Encryption with a Security Token
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Security tokens can be used to sign and encrypt SOAP messages and the WSE 3.0 class library provides a number of tokens in the Microsoft.Web.Services3.Security.Tokens
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namespace. There are many different types of tokens, each of which has its own respec tive strengths and weaknesses. Each token implementation in WSE 3.0 derives from the SecurityToken base class. The WSE 3.0 classes that inherit from SecurityToken are shown in the following list:
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Microsoft.Web.Services3.Security.Tokens.BinarySecurityToken Microsoft.Web.Services3.Security.Tokens.DerivedKeyToken Microsoft.Web.Services3.Security.Tokens.EncryptedKeyToken Microsoft.Web.Services3.Security.Tokens.IssuedToken Microsoft.Web.Services3.Security.Tokens.UsernameToken Microsoft.Web.Services3.Security.Tokens.X509SecurityToken
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While an in-depth discussion about the strengths and weaknesses of each type of token is beyond the scope of this discussion, the WSE 3.0 documentation file pro vides a good bit of background about each token s usage and benefits or weaknesses. To be used with the custom security policy assertion that was introduced in the pre vious section, Creating a Custom Policy Assertion, you ll use the UsernameToken. A UsernameToken object contains a user name and/or a password. When a Web service receives a request, the user name and password values can be retrieved and compared against a store, such as a database or Windows Active Directory (or whatever other mechanism one chooses to implement), to determine whether the request is valid. The major benefit of using UsernameToken is its simplicity. To sign and encrypt a mes sage with a SecurityToken, the mechanism is fairly simple. In the context of WSE 3.0, we re adding code to the Web service client s custom output filter, the overridden SecureMessage method of the ClientFilterOut class: 1. Create a token type, such as UsernameToken. 2. Add credentials to the token. 3. Decide which PasswordOption value is appropriate. 4. Add the UsernameToken to the SOAP security header. 5. Sign the SOAP message using an XML signature object. 6. Create a new EncryptedData object, passing in the UsernameToken. 7. Add the EncryptedData object to the collection of signatures and encryption keys in the security context, as shown in the following code:
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'VB ' Create token for signing and encryption
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Lesson 2: Custom Policies
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Dim userToken As New UsernameToken(parentAssertion.UserName, _
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parentAssertion.Password, PasswordOption.SendPlainText)
' Add token to SOAP security header
security.Tokens.Add(userToken)
' Sign SOAP message using an XML signature object
Dim mesSignature As New MessageSignature(userToken)
security.Elements.Add(mesSignature)
' Encrypt message body
Dim encData As New EncryptedData(userToken)
' Add encrypted data to collection of signatures and
' encryption keys
security.Elements.Add(encData)
//C# // Create token for signing and encryption
UsernameToken userToken = new UsernameToken(parentAssertion.UserName,
parentAssertion.Password, PasswordOption.SendPlainText);
// Add token to SOAP security header
security.Tokens.Add(userToken);
// Sign SOAP message using an XML signature object
MessageSignature mesSignature = new MessageSignature(userToken);
security.Elements.Add(mesSignature);
// Encrypt message body
EncryptedData encData = new EncryptedData(userToken);
// Add encrypted data to collection of signatures and
// encryption keys
security.Elements.Add(encData);
Although the code doesn t specify which type of authentication to use (that is, Win dows or custom), both types can be used with the UsernameToken. However, if you want custom authentication, that requires creating a class deriving from the User nameTokenManager and overriding the AuthenticateToken method to authenticate against a custom data store such as a database. The derived class must then be regis tered in the Web.config file for the Web service using the Type attribute of the <securityTokenManager> element. Otherwise, the code is straightforward, and the only tricky part of the process is choosing the correct PasswordOption value to use. A brief discus
10
WSE Security
sion of each PasswordOption value is provided in Table 10-1.
Table 10-1 Table 10-1 The PasswordOption Enumeration
Value SendHashed
Description The password is included and the SHA-1 algorithm is used to hash it. To use this value, you must provide a class that inher its from the UsernameTokenManager class, which automati cally calls an overridden AuthenticateToken method to handle authentication. The password is not included in the transmission of the mes sage; however, it is used to sign the message and must be pro vided to allow the message to be decrypted. The password is sent in plain text. This option can be useful, but because it is transmitted in plain text, it has limited appli cability. It is only suitable for scenarios where a certificate is used to encrypt the UsernameToken value, or if the transport channel has been secured using Secure Sockets Layer (SSL).
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