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host.Authorization.ExternalAuthorizationPolicies = policies.AsReadOnly();
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The declarative technique is a little easier. You can place an authorizationPolicies element within the serviceAuthorization element for a service s behavior. The following segment from a configuration file demonstrates adding the CustomPolicy authorization policy to the service.
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<behavior name="DemoBehavior"> <serviceAuthorization> <authorizationPolicies> <add policyType="DemoLibrary.CustomPolicy" /> </authorizationPolicies> </serviceAuthorization> </behavior>
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The custom authorization policy (or any authorization policy) is built to add claims to the security context for the request. However, this is not the only place where claims are added. When a request first arrives at the service, the security tokens included with the request are evaluated. These claims are also added to the security context. The process of actually interpreting the token and adding the claims is left to a set of classes known as Token Authenticators. There is a separate authenticator for each type of token. Table 8-6 contains a list of the most commonly used token authenticators.
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Table 8-6
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Commonly Used Security Token Authenticators
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Description Ensures that the token is a valid Windows token. A WindowsClaimSet is generated.
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SecurityTokenAuthenticator Type WindowsSecurityTokenAuthenticator
KerberosSecurityTokenAuthenticator Ensures that the token is a valid Kerberos token. A WindowsClaimsSet is generated. X509SecurityTokenAuthenticator Validates the certificate. If possible, the certificate is mapped to a Windows identity. An X509ClaimSet is generated. A WindowsClaimSet is generated if the identity mapping was successful. Creates a Windows token for the username and password provided. A WindowsClaimSet is generated. Validates the username and password against the configured membership provider or password validator. A UserNameClaimSet is generated. Ensures that the SAML token is valid. Includes the claims that are part of the token in the security context.
WindowsUserNameSecurityTokenAuthenticator CustomUserNameSecurityTokenAuthenticator SamlSecurityTokenAuthenticator
Lesson 2: Authorization and Impersonation
Because a single request can contain more than one token, it is possible that more than one authenticator will be used for the same request. Also, the data store used for authentication depends on the type of token. Windows tokens are authenticated against the Windows domain, as are username tokens, unless another provider has been specified. To change the provider for username tokens, change the userNamePasswordValidationMode attribute from Windows to MembershipProvider. This causes the ASP.NET membership provider to be used. Alternate membership providers can be specified in a single userNameAuthentication element. The following segment illustrates the attributes available to this element:
<userNameAuthentication cacheLogonTokenLifetime="<TimeSpan>" cacheLogonTokens="<Boolean>" customUserNamePasswordValidatorType="<String>" includeWindowsGroups="<Boolean>" maxCacheLogonTokens="<Integer>" membershipProviderName="<String>" userNamePasswordValidationMode="<Windows|MembershipProvider|Custom>" />
A number of attributes are directly related to caching the tokens. The cacheLogonTokenLifetime attribute specifies how long any individual token should be cached. The maxCacheLogonTokens attribute indicates how many tokens should be kept in the cache at one time. Caching tokens is controlled through the cacheLogonTokens attribute. If tokens are cached, the claim set generated by the token is stored so that if the token is presented again, the cache claims can be added without having to go back to the security data store. The includeWindowsGroups attribute determines whether the Windows groups to which a user belongs should be included in the generated claim set. If this attribute is set to true, there is a potential performance implication because all the Windows groups will be expanded to ensure that all the appropriate groups are included in the claims. The last three attributes are related to how the username token is authenticated. If the userNamePasswordValidationMode is set to MembershipProvider, the membership provider specified in the membershipProviderName attribute validates the credentials. If the userNamePasswordValidationMode is set to Custom, the password validator identified by the customUserNamePasswordValidatorType attribute authenticates the credentials. Certificates are authenticated using the rules specified in the clientCertificate section of the service behavior. There are two components in the clientCertificate configuration. The certificate element specifies which certificate to use when secure communication with the client must be arranged. This would normally be required when a secure duplex channel is used and is not part of the authorization process. The second component is the authentication element. This element specifies how the certificate should be authenticated. The following segment illustrates the options that are available:
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