SecurityKeyType Enum

Definition

Namespace:

System.IdentityModel.Tokens

Assembly:

System.ServiceModel.Primitives.dll

Package:

System.ServiceModel.Primitives v8.0.0

Source:

SecurityKeyType.cs

Specifies the type of key that is associated with a security token.

public enum class SecurityKeyType

public enum SecurityKeyType

type SecurityKeyType = 

Public Enum SecurityKeyType

Inheritance

Object

ValueType

Enum

SecurityKeyType

Fields

Name	Value	Description
SymmetricKey	0	Specifies that the key is a symmetric key.
AsymmetricKey	1	Specifies that the key is an asymmetric key.
BearerKey	2	Specifies that the security token does not contain a proof-of-possession key.

Remarks

Use the SecurityKeyType enumeration to set the KeyType property.

The BearerKey field is used with the KeyType property.

BearerKey Requires Wsu:Id or Transport Security with Message Credentials

In federation scenarios, an issued token is generally configured as an endorsing supporting token for message security between a client and the relying parties. However, when a Security Token Service (STS) issues a token with no key (BearerKey), WCF configures it as a SecurityTokenAttachmentMode.SignedEncrypted supporting token (WCF cannot endorse without a key). This requires the issued token to be referenced in the signature. WCF currently uses the following: http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd:Id as a reference mechanism (Wsu:Id).

If an issued token does not have such an attribute, on a client, a MessageSecurityException is thrown with the text "Element to sign must have id". This happens when a SAML 1.1 token is used as an issued token (the Wsu:Id is not defined in the SAML 1.1 specification).

To work around this situation, either use transport security with message credentials (for example, AuthenticationMode.IssuedTokenOverTransport), or an STS must add the http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd:Id (Wsu:Id) to the issued token.

Note that if the Wsu:Id is added to a SAML 1.1 token, the resulting XML does not comply to the SAML 1.1 specification. The alternative is to add a Wsu:Id to the EncryptedData which is a result of encrypting the issued token. This procedure complies with the SAML 1.1 specification, because the EncryptedData element supports the Wsu:Id attribute.

So to be compliant with the specification, the bearer token must be encrypted by the STS.