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//-----------------------------------------------------------------------
// <copyright file="IncomingMessageValidationBindingElement.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OAuth2.ChannelElements {
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.Linq;
using System.Text;
using DotNetOpenAuth.OAuth2.Messages;
using Messaging;
/// <summary>
/// A guard for all messages incoming to an Authorization Server to ensure that they are well formed,
/// have valid secrets, callback URIs, etc.
/// </summary>
internal class IncomingMessageValidationBindingElement : AuthServerBindingElementBase {
/// <summary>
/// Gets the protection commonly offered (if any) by this binding element.
/// </summary>
/// <remarks>
/// This value is used to assist in sorting binding elements in the channel stack.
/// </remarks>
public override MessageProtections Protection {
get { return MessageProtections.None; }
}
/// <summary>
/// Prepares a message for sending based on the rules of this channel binding element.
/// </summary>
/// <param name="message">The message to prepare for sending.</param>
/// <returns>
/// The protections (if any) that this binding element applied to the message.
/// Null if this binding element did not even apply to this binding element.
/// </returns>
/// <remarks>
/// Implementations that provide message protection must honor the
/// <see cref="MessagePartAttribute.RequiredProtection"/> properties where applicable.
/// </remarks>
public override MessageProtections? ProcessOutgoingMessage(IProtocolMessage message) {
return null;
}
/// <summary>
/// Performs any transformation on an incoming message that may be necessary and/or
/// validates an incoming message based on the rules of this channel binding element.
/// </summary>
/// <param name="message">The incoming message to process.</param>
/// <returns>
/// The protections (if any) that this binding element applied to the message.
/// Null if this binding element did not even apply to this binding element.
/// </returns>
/// <exception cref="ProtocolException">
/// Thrown when the binding element rules indicate that this message is invalid and should
/// NOT be processed.
/// </exception>
/// <remarks>
/// Implementations that provide message protection must honor the
/// <see cref="MessagePartAttribute.RequiredProtection"/> properties where applicable.
/// </remarks>
public override MessageProtections? ProcessIncomingMessage(IProtocolMessage message) {
bool applied = false;
// Check that the client secret is correct for client authenticated messages.
var authenticatedClientRequest = message as AuthenticatedClientRequestBase;
if (authenticatedClientRequest != null) {
var client = this.AuthorizationServer.GetClientOrThrow(authenticatedClientRequest.ClientIdentifier);
string secret = client.Secret;
ErrorUtilities.VerifyProtocol(!string.IsNullOrEmpty(secret), Protocol.unauthorized_client); // an empty secret is not allowed for client authenticated calls.
ErrorUtilities.VerifyProtocol(MessagingUtilities.EqualsConstantTime(secret, authenticatedClientRequest.ClientSecret), Protocol.incorrect_client_credentials);
applied = true;
}
// Check that authorization requests come with an acceptable callback URI.
var authorizationRequest = message as EndUserAuthorizationRequest;
if (authorizationRequest != null) {
var client = this.AuthorizationServer.GetClientOrThrow(authorizationRequest.ClientIdentifier);
ErrorUtilities.VerifyProtocol(authorizationRequest.Callback == null || client.IsCallbackAllowed(authorizationRequest.Callback), OAuthStrings.ClientCallbackDisallowed, authorizationRequest.Callback);
ErrorUtilities.VerifyProtocol(authorizationRequest.Callback != null || client.DefaultCallback != null, OAuthStrings.NoCallback);
applied = true;
}
// Check that the callback URI in a direct message from the client matches the one in the indirect message received earlier.
var request = message as AccessTokenAuthorizationCodeRequestAS;
if (request != null) {
IAuthorizationCodeCarryingRequest tokenRequest = request;
tokenRequest.AuthorizationDescription.VerifyCallback(request.Callback);
applied = true;
}
return applied ? (MessageProtections?)MessageProtections.None : null;
}
}
}
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