/// <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 MessageProtections?ProcessIncomingMessage(IProtocolMessage message)
{
IndirectSignedResponse response = message as IndirectSignedResponse;
if (this.UseRequestNonce(response))
{
if (!response.ReturnToParametersSignatureValidated)
{
Logger.OpenId.Error("Incoming message is expected to have a nonce, but the return_to parameter is not signed.");
}
string nonceValue = response.GetReturnToArgument(NonceParameter);
ErrorUtilities.VerifyProtocol(
nonceValue != null && response.ReturnToParametersSignatureValidated,
this.securitySettings.RejectUnsolicitedAssertions ? OpenIdStrings.UnsolicitedAssertionsNotAllowed : OpenIdStrings.UnsolicitedAssertionsNotAllowedFrom1xOPs);
CustomNonce nonce = CustomNonce.Deserialize(nonceValue);
DateTime expirationDate = nonce.CreationDateUtc + MaximumMessageAge;
if (expirationDate < DateTime.UtcNow)
{
throw new ExpiredMessageException(expirationDate, message);
}
IReplayProtectedProtocolMessage replayResponse = response;
if (!this.nonceStore.StoreNonce(replayResponse.NonceContext, nonce.RandomPartAsString, nonce.CreationDateUtc))
{
Logger.OpenId.ErrorFormat("Replayed nonce detected ({0} {1}). Rejecting message.", replayResponse.Nonce, replayResponse.UtcCreationDate);
throw new ReplayedMessageException(message);
}
return(MessageProtections.ReplayProtection);
}
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>
/// True if the <paramref name="message"/> applied to this binding element
/// and the operation was successful. False if the operation did not apply to this message.
/// </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 bool PrepareMessageForReceiving(IProtocolMessage message)
{
IndirectSignedResponse response = message as IndirectSignedResponse;
if (response != null && response.Version.Major < 2)
{
string nonceValue = response.GetReturnToArgument(NonceParameter);
ErrorUtilities.VerifyProtocol(nonceValue != null, OpenIdStrings.UnsolicitedAssertionsNotAllowedFrom1xOPs);
CustomNonce nonce = CustomNonce.Deserialize(nonceValue);
DateTime expirationDate = nonce.CreationDateUtc + MaximumMessageAge;
if (expirationDate < DateTime.UtcNow)
{
throw new ExpiredMessageException(expirationDate, message);
}
if (!this.nonceStore.StoreNonce(nonce.RandomPartAsString, nonce.CreationDateUtc))
{
throw new ReplayedMessageException(message);
}
return(true);
}
return(false);
}