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//-----------------------------------------------------------------------
// <copyright file="AccessRequestBindingElement.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.CodeAnalysis;
using System.Globalization;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using DotNetOpenAuth.Messaging;
using DotNetOpenAuth.Messaging.Bindings;
using DotNetOpenAuth.OAuth2.AuthServer.ChannelElements;
using DotNetOpenAuth.OAuth2.Messages;
/// <summary>
/// Decodes authorization codes and refresh 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/// not been revoked and that an access token has not expired.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>
/// 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 responseWithOriginatingRequest = message as IDirectResponseProtocolMessage;
var accessRequest = responseWithOriginatingRequest.OriginatingRequest as IAccessTokenRequestInternal;
var authCodeCarrier = message as IAuthorizationCodeCarryingRequest;
if (authCodeCarrier != null) {
var codeFormatter = AuthorizationCode.CreateFormatter(this.AuthorizationServer);
var code = authCodeCarrier.AuthorizationDescription;
authCodeCarrier.Code = codeFormatter.Serialize(code);
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>
[SuppressMessage("Microsoft.Naming", "CA2204:Literals should be spelled correctly", MessageId = "unauthorizedclient", Justification = "Protocol requirement")]
[SuppressMessage("Microsoft.Naming", "CA2204:Literals should be spelled correctly", MessageId = "incorrectclientcredentials", Justification = "Protocol requirement")]
[SuppressMessage("Microsoft.Naming", "CA2204:Literals should be spelled correctly", MessageId = "authorizationexpired", Justification = "Protocol requirement")]
[SuppressMessage("Microsoft.Globalization", "CA1303:Do not pass literals as localized parameters", MessageId = "DotNetOpenAuth.Messaging.ErrorUtilities.VerifyProtocol(System.Boolean,System.String,System.Object[])", Justification = "Protocol requirement")]
public override MessageProtections? ProcessIncomingMessage(IProtocolMessage message) {
var tokenRequest = message as IAuthorizationCarryingRequest;
if (tokenRequest != null) {
try {
var authCodeCarrier = message as IAuthorizationCodeCarryingRequest;
var refreshTokenCarrier = message as IRefreshTokenCarryingRequest;
var resourceOwnerPasswordCarrier = message as AccessTokenResourceOwnerPasswordCredentialsRequest;
var clientCredentialOnly = message as AccessTokenClientCredentialsRequest;
if (authCodeCarrier != null) {
var authorizationCodeFormatter = AuthorizationCode.CreateFormatter(this.AuthorizationServer);
var authorizationCode = authorizationCodeFormatter.Deserialize(message, authCodeCarrier.Code, Protocol.code);
authCodeCarrier.AuthorizationDescription = authorizationCode;
} else if (refreshTokenCarrier != null) {
var refreshTokenFormatter = RefreshToken.CreateFormatter(this.AuthorizationServer.CryptoKeyStore);
var refreshToken = refreshTokenFormatter.Deserialize(message, refreshTokenCarrier.RefreshToken, Protocol.refresh_token);
refreshTokenCarrier.AuthorizationDescription = refreshToken;
} else if (resourceOwnerPasswordCarrier != null) {
try {
if (this.AuthorizationServer.IsResourceOwnerCredentialValid(resourceOwnerPasswordCarrier.UserName, resourceOwnerPasswordCarrier.Password)) {
resourceOwnerPasswordCarrier.CredentialsValidated = true;
} else {
Logger.OAuth.WarnFormat(
"Resource owner password credential for user \"{0}\" rejected by authorization server host.",
resourceOwnerPasswordCarrier.UserName);
// TODO: fix this to report the appropriate error code for a bad credential.
throw new ProtocolException();
}
} catch (NotSupportedException) {
// TODO: fix this to return the appropriate error code for not supporting resource owner password credentials
throw new ProtocolException();
} catch (NotImplementedException) {
// TODO: fix this to return the appropriate error code for not supporting resource owner password credentials
throw new ProtocolException();
}
} else if (clientCredentialOnly != null) {
// this method will throw later if the credentials are false.
clientCredentialOnly.CredentialsValidated = true;
} else {
throw ErrorUtilities.ThrowInternal("Unexpected message type: " + tokenRequest.GetType());
}
} 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);
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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