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//-----------------------------------------------------------------------
// <copyright file="AccessRequestBindingElement.cs" company="Andrew Arnott">
// Copyright (c) Andrew Arnott. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OAuth2.ChannelElements {
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using DotNetOpenAuth.Messaging;
using DotNetOpenAuth.Messaging.Bindings;
using DotNetOpenAuth.OAuth2.Messages;
/// <summary>
/// Decodes verification codes, refresh tokens and access tokens on incoming messages.
/// </summary>
/// <remarks>
/// This binding element also ensures that the code/token coming in is issued to
/// the same client that is sending the code/token and that the authorization has
/// not been revoked and that an access token has not expired.
/// </remarks>
internal class AccessRequestBindingElement : AuthServerBindingElementBase {
/// <summary>
/// Initializes a new instance of the <see cref="AccessRequestBindingElement"/> class.
/// </summary>
internal AccessRequestBindingElement() {
}
/// <summary>
/// Gets the protection commonly offered (if any) by this binding element.
/// </summary>
/// <value></value>
/// <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) {
var response = message as IAuthorizationCarryingRequest;
if (response != null) {
switch (response.CodeOrTokenType) {
case CodeOrTokenType.AuthorizationCode:
var codeFormatter = AuthorizationCode.CreateFormatter(this.AuthorizationServer);
var code = (AuthorizationCode)response.AuthorizationDescription;
response.CodeOrToken = codeFormatter.Serialize(code);
break;
case CodeOrTokenType.AccessToken:
var responseWithOriginatingRequest = (IDirectResponseProtocolMessage)message;
var request = (IAccessTokenRequest)responseWithOriginatingRequest.OriginatingRequest;
using (var resourceServerKey = this.AuthorizationServer.GetResourceServerEncryptionKey(request)) {
var tokenFormatter = AccessToken.CreateFormatter(this.AuthorizationServer.AccessTokenSigningKey, resourceServerKey);
var token = (AccessToken)response.AuthorizationDescription;
response.CodeOrToken = tokenFormatter.Serialize(token);
break;
}
default:
throw ErrorUtilities.ThrowInternal(string.Format(CultureInfo.CurrentCulture, "Unexpected outgoing code or token type: {0}", response.CodeOrTokenType));
}
return MessageProtections.None;
}
var accessTokenResponse = message as AccessTokenSuccessResponse;
if (accessTokenResponse != null) {
var directResponseMessage = (IDirectResponseProtocolMessage)accessTokenResponse;
var accessTokenRequest = (AccessTokenRequestBase)directResponseMessage.OriginatingRequest;
ErrorUtilities.VerifyProtocol(accessTokenRequest.GrantType != GrantType.ClientCredentials || accessTokenResponse.RefreshToken == null, OAuthStrings.NoGrantNoRefreshToken);
}
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) {
var tokenRequest = message as IAuthorizationCarryingRequest;
if (tokenRequest != null) {
try {
switch (tokenRequest.CodeOrTokenType) {
case CodeOrTokenType.AuthorizationCode:
var verificationCodeFormatter = AuthorizationCode.CreateFormatter(this.AuthorizationServer);
var verificationCode = verificationCodeFormatter.Deserialize(message, tokenRequest.CodeOrToken);
tokenRequest.AuthorizationDescription = verificationCode;
break;
case CodeOrTokenType.RefreshToken:
var refreshTokenFormatter = RefreshToken.CreateFormatter(this.AuthorizationServer.CryptoKeyStore);
var refreshToken = refreshTokenFormatter.Deserialize(message, tokenRequest.CodeOrToken);
tokenRequest.AuthorizationDescription = refreshToken;
break;
default:
throw ErrorUtilities.ThrowInternal("Unexpected value for CodeOrTokenType: " + tokenRequest.CodeOrTokenType);
}
} catch (ExpiredMessageException ex) {
throw ErrorUtilities.Wrap(ex, Protocol.authorization_expired);
}
var accessRequest = tokenRequest as AccessTokenRequestBase;
if (accessRequest != null) {
// Make sure the client sending us this token is the client we issued the token to.
ErrorUtilities.VerifyProtocol(string.Equals(accessRequest.ClientIdentifier, tokenRequest.AuthorizationDescription.ClientIdentifier, StringComparison.Ordinal), Protocol.incorrect_client_credentials);
// Check that the client secret is correct.
var client = this.AuthorizationServer.GetClientOrThrow(accessRequest.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, accessRequest.ClientSecret), Protocol.incorrect_client_credentials);
var scopedAccessRequest = accessRequest as ScopedAccessTokenRequest;
if (scopedAccessRequest != null) {
// Make sure the scope the client is requesting does not exceed the scope in the grant.
ErrorUtilities.VerifyProtocol(scopedAccessRequest.Scope.IsSubsetOf(tokenRequest.AuthorizationDescription.Scope), OAuthStrings.AccessScopeExceedsGrantScope, scopedAccessRequest.Scope, tokenRequest.AuthorizationDescription.Scope);
}
}
// Make sure the authorization this token represents hasn't already been revoked.
ErrorUtilities.VerifyProtocol(this.AuthorizationServer.IsAuthorizationValid(tokenRequest.AuthorizationDescription), Protocol.authorization_expired);
return MessageProtections.None;
}
return null;
}
}
}
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