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//-----------------------------------------------------------------------
// <copyright file="MessageValidationBindingElement.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OAuth2.ChannelElements {
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using DotNetOpenAuth.OAuth2.Messages;
using Messaging;
using Validation;
/// <summary>
/// A guard for all messages to or from an Authorization Server to ensure that they are well formed,
/// have valid secrets, callback URIs, etc.
/// </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/// not been revoked and that an access token has not expired.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 MessageValidationBindingElement : AuthServerBindingElementBase {
/// <summary>
/// The aggregating client authentication module.
/// </summary>
private readonly ClientAuthenticationModule clientAuthenticationModule;
/// <summary>
/// Initializes a new instance of the <see cref="MessageValidationBindingElement"/> class.
/// </summary>
/// <param name="clientAuthenticationModule">The aggregating client authentication module.</param>
internal MessageValidationBindingElement(ClientAuthenticationModule clientAuthenticationModule) {
Requires.NotNull(clientAuthenticationModule, "clientAuthenticationModule");
this.clientAuthenticationModule = clientAuthenticationModule;
}
/// <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 Task<MessageProtections?> ProcessOutgoingMessageAsync(IProtocolMessage message, CancellationToken cancellationToken) {
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 async Task<MessageProtections?> ProcessIncomingMessageAsync(IProtocolMessage message, CancellationToken cancellationToken) {
bool applied = false;
// Check that the client secret is correct for client authenticated messages.
var clientCredentialOnly = message as AccessTokenClientCredentialsRequest;
var authenticatedClientRequest = message as AuthenticatedClientRequestBase;
var accessTokenRequest = authenticatedClientRequest as AccessTokenRequestBase; // currently the only type of message.
var resourceOwnerPasswordCarrier = message as AccessTokenResourceOwnerPasswordCredentialsRequest;
if (authenticatedClientRequest != null) {
string clientIdentifier;
var result = this.clientAuthenticationModule.TryAuthenticateClient(this.AuthServerChannel.AuthorizationServer, authenticatedClientRequest, out clientIdentifier);
switch (result) {
case ClientAuthenticationResult.ClientAuthenticated:
break;
case ClientAuthenticationResult.NoAuthenticationRecognized:
case ClientAuthenticationResult.ClientIdNotAuthenticated:
// The only grant type that allows no client credentials is the resource owner credentials grant.
AuthServerUtilities.TokenEndpointVerify(resourceOwnerPasswordCarrier != null, accessTokenRequest, Protocol.AccessTokenRequestErrorCodes.InvalidClient, this.clientAuthenticationModule, AuthServerStrings.ClientSecretMismatch);
break;
default:
AuthServerUtilities.TokenEndpointVerify(false, accessTokenRequest, Protocol.AccessTokenRequestErrorCodes.InvalidClient, this.clientAuthenticationModule, AuthServerStrings.ClientSecretMismatch);
break;
}
authenticatedClientRequest.ClientIdentifier = result == ClientAuthenticationResult.NoAuthenticationRecognized ? null : clientIdentifier;
accessTokenRequest.ClientAuthenticated = result == ClientAuthenticationResult.ClientAuthenticated;
applied = true;
}
// Check that any resource owner password credential is correct.
if (resourceOwnerPasswordCarrier != null) {
try {
var authorizeResult =
this.AuthorizationServer.CheckAuthorizeResourceOwnerCredentialGrant(
resourceOwnerPasswordCarrier.RequestingUserName, resourceOwnerPasswordCarrier.Password, resourceOwnerPasswordCarrier);
if (authorizeResult.IsApproved) {
resourceOwnerPasswordCarrier.CredentialsValidated = true;
resourceOwnerPasswordCarrier.RequestingUserName = authorizeResult.CanonicalUserName;
resourceOwnerPasswordCarrier.Scope.ResetContents(authorizeResult.ApprovedScope);
} else {
Logger.OAuth.ErrorFormat(
"Resource owner password credential for user \"{0}\" rejected by authorization server host.",
resourceOwnerPasswordCarrier.RequestingUserName);
throw new TokenEndpointProtocolException(accessTokenRequest, Protocol.AccessTokenRequestErrorCodes.InvalidGrant, AuthServerStrings.InvalidResourceOwnerPasswordCredential);
}
} catch (NotSupportedException) {
throw new TokenEndpointProtocolException(accessTokenRequest, Protocol.AccessTokenRequestErrorCodes.UnsupportedGrantType);
} catch (NotImplementedException) {
throw new TokenEndpointProtocolException(accessTokenRequest, Protocol.AccessTokenRequestErrorCodes.UnsupportedGrantType);
}
applied = true;
} else if (clientCredentialOnly != null) {
try {
var authorizeResult = this.AuthorizationServer.CheckAuthorizeClientCredentialsGrant(clientCredentialOnly);
if (!authorizeResult.IsApproved) {
Logger.OAuth.ErrorFormat(
"Client credentials grant access request for client \"{0}\" rejected by authorization server host.",
clientCredentialOnly.ClientIdentifier);
throw new TokenEndpointProtocolException(accessTokenRequest, Protocol.AccessTokenRequestErrorCodes.UnauthorizedClient);
}
clientCredentialOnly.Scope.ResetContents(authorizeResult.ApprovedScope);
} catch (NotSupportedException) {
throw new TokenEndpointProtocolException(accessTokenRequest, Protocol.AccessTokenRequestErrorCodes.UnsupportedGrantType);
} catch (NotImplementedException) {
throw new TokenEndpointProtocolException(accessTokenRequest, Protocol.AccessTokenRequestErrorCodes.UnsupportedGrantType);
}
} else {
// 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), AuthServerStrings.ClientCallbackDisallowed, authorizationRequest.Callback);
ErrorUtilities.VerifyProtocol(authorizationRequest.Callback != null || client.DefaultCallback != null, AuthServerStrings.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;
}
var authCarrier = message as IAuthorizationCarryingRequest;
if (authCarrier != null) {
var accessRequest = authCarrier as AccessTokenRequestBase;
if (accessRequest != null) {
// Make sure the client sending us this token is the client we issued the token to.
AuthServerUtilities.TokenEndpointVerify(string.Equals(accessRequest.ClientIdentifier, authCarrier.AuthorizationDescription.ClientIdentifier, StringComparison.Ordinal), accessTokenRequest, Protocol.AccessTokenRequestErrorCodes.InvalidClient);
var scopedAccessRequest = accessRequest as ScopedAccessTokenRequest;
if (scopedAccessRequest != null) {
// Make sure the scope the client is requesting does not exceed the scope in the grant.
if (!this.AuthServerChannel.ScopeSatisfiedCheck.IsScopeSatisfied(requiredScope: scopedAccessRequest.Scope, grantedScope: authCarrier.AuthorizationDescription.Scope)) {
Logger.OAuth.ErrorFormat("The requested access scope (\"{0}\") exceeds the grant scope (\"{1}\").", scopedAccessRequest.Scope, authCarrier.AuthorizationDescription.Scope);
throw new TokenEndpointProtocolException(accessTokenRequest, Protocol.AccessTokenRequestErrorCodes.InvalidScope, AuthServerStrings.AccessScopeExceedsGrantScope);
}
}
}
// Make sure the authorization this token represents hasn't already been revoked.
if (!this.AuthorizationServer.IsAuthorizationValid(authCarrier.AuthorizationDescription)) {
Logger.OAuth.Error("Rejecting access token request because the IAuthorizationServerHost.IsAuthorizationValid method returned false.");
throw new TokenEndpointProtocolException(accessTokenRequest, Protocol.AccessTokenRequestErrorCodes.InvalidGrant);
}
applied = true;
}
}
return applied ? (MessageProtections?)MessageProtections.None : null;
}
}
}
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