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namespace OAuthResourceServer.Code {
using System;
using System.Collections.Generic;
using System.IdentityModel.Policy;
using System.Linq;
using System.Security.Principal;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.ServiceModel.Security;
using DotNetOpenAuth.Messaging;
using DotNetOpenAuth.OAuth2;
using ProtocolException = System.ServiceModel.ProtocolException;
/// <summary>
/// A WCF extension to authenticate incoming messages using OAuth.
/// </summary>
public class OAuthAuthorizationManager : ServiceAuthorizationManager {
public OAuthAuthorizationManager() {
}
protected override bool CheckAccessCore(OperationContext operationContext) {
if (!base.CheckAccessCore(operationContext)) {
return false;
}
var httpDetails = operationContext.RequestContext.RequestMessage.Properties[HttpRequestMessageProperty.Name] as HttpRequestMessageProperty;
var requestUri = operationContext.RequestContext.RequestMessage.Properties.Via;
try {
var principal = VerifyOAuth2(httpDetails, requestUri);
if (principal != null) {
var policy = new OAuthPrincipalAuthorizationPolicy(principal);
var policies = new List<IAuthorizationPolicy> {
policy,
};
var securityContext = new ServiceSecurityContext(policies.AsReadOnly());
if (operationContext.IncomingMessageProperties.Security != null) {
operationContext.IncomingMessageProperties.Security.ServiceSecurityContext = securityContext;
} else {
operationContext.IncomingMessageProperties.Security = new SecurityMessageProperty {
ServiceSecurityContext = securityContext,
};
}
securityContext.AuthorizationContext.Properties["Identities"] = new List<IIdentity> {
principal.Identity,
};
// Only allow this method call if the access token scope permits it.
return principal.IsInRole(operationContext.IncomingMessageHeaders.Action ?? operationContext.IncomingMessageHeaders.To.AbsolutePath);
} else {
return false;
}
} catch (ProtocolException ex) {
Global.Logger.Error("Error processing OAuth messages.", ex);
}
return false;
}
private static IPrincipal VerifyOAuth2(HttpRequestMessageProperty httpDetails, Uri requestUri) {
// for this sample where the auth server and resource server are the same site,
// we use the same public/private key.
using (var signing = Global.CreateAuthorizationServerSigningServiceProvider()) {
using (var encrypting = Global.CreateResourceServerEncryptionServiceProvider()) {
var resourceServer = new ResourceServer(new StandardAccessTokenAnalyzer(signing, encrypting));
IPrincipal result;
var error = resourceServer.VerifyAccess(HttpRequestInfo.Create(httpDetails, requestUri), out result);
// TODO: return the prepared error code.
return error != null ? null : result;
}
}
}
}
}
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