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//-----------------------------------------------------------------------
// <copyright file="OpenIdRelyingPartyChannel.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OpenId.ChannelElements {
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using DotNetOpenAuth.Messaging;
using DotNetOpenAuth.Messaging.Bindings;
using DotNetOpenAuth.OpenId.Extensions;
using DotNetOpenAuth.OpenId.RelyingParty;
using Validation;
/// <summary>
/// The messaging channel for OpenID relying parties.
/// </summary>
internal class OpenIdRelyingPartyChannel : OpenIdChannel {
/// <summary>
/// Initializes a new instance of the <see cref="OpenIdRelyingPartyChannel"/> class.
/// </summary>
/// <param name="cryptoKeyStore">The association store to use.</param>
/// <param name="nonceStore">The nonce store to use.</param>
/// <param name="securitySettings">The security settings to apply.</param>
internal OpenIdRelyingPartyChannel(ICryptoKeyStore cryptoKeyStore, INonceStore nonceStore, RelyingPartySecuritySettings securitySettings)
: this(cryptoKeyStore, nonceStore, new OpenIdRelyingPartyMessageFactory(), securitySettings, false) {
Requires.NotNull(securitySettings, "securitySettings");
}
/// <summary>
/// Initializes a new instance of the <see cref="OpenIdRelyingPartyChannel"/> class.
/// </summary>
/// <param name="cryptoKeyStore">The association store to use.</param>
/// <param name="nonceStore">The nonce store to use.</param>
/// <param name="messageTypeProvider">An object that knows how to distinguish the various OpenID message types for deserialization purposes.</param>
/// <param name="securitySettings">The security settings to apply.</param>
/// <param name="nonVerifying">A value indicating whether the channel is set up with no functional security binding elements.</param>
private OpenIdRelyingPartyChannel(ICryptoKeyStore cryptoKeyStore, INonceStore nonceStore, IMessageFactory messageTypeProvider, RelyingPartySecuritySettings securitySettings, bool nonVerifying) :
base(messageTypeProvider, InitializeBindingElements(cryptoKeyStore, nonceStore, securitySettings, nonVerifying)) {
Requires.NotNull(messageTypeProvider, "messageTypeProvider");
Requires.NotNull(securitySettings, "securitySettings");
Assumes.True(!nonVerifying || securitySettings is RelyingPartySecuritySettings);
}
/// <summary>
/// A value indicating whether the channel is set up
/// with no functional security binding elements.
/// </summary>
/// <returns>A new <see cref="OpenIdChannel"/> instance that will not perform verification on incoming messages or apply any security to outgoing messages.</returns>
/// <remarks>
/// <para>A value of <c>true</c> allows the relying party to preview incoming
/// messages without invalidating nonces or checking signatures.</para>
/// <para>Setting this to <c>true</c> poses a great security risk and is only
/// present to support the OpenIdAjaxTextBox which needs to preview
/// messages, and will validate them later.</para>
/// </remarks>
internal static OpenIdChannel CreateNonVerifyingChannel() {
return new OpenIdRelyingPartyChannel(null, null, new OpenIdRelyingPartyMessageFactory(), new RelyingPartySecuritySettings(), true);
}
/// <summary>
/// Initializes the binding elements.
/// </summary>
/// <param name="cryptoKeyStore">The crypto key store.</param>
/// <param name="nonceStore">The nonce store to use.</param>
/// <param name="securitySettings">The security settings to apply. Must be an instance of either <see cref="RelyingPartySecuritySettings"/> or ProviderSecuritySettings.</param>
/// <param name="nonVerifying">A value indicating whether the channel is set up with no functional security binding elements.</param>
/// <returns>
/// An array of binding elements which may be used to construct the channel.
/// </returns>
private static IChannelBindingElement[] InitializeBindingElements(ICryptoKeyStore cryptoKeyStore, INonceStore nonceStore, RelyingPartySecuritySettings securitySettings, bool nonVerifying) {
Requires.NotNull(securitySettings, "securitySettings");
SigningBindingElement signingElement;
signingElement = nonVerifying ? null : new RelyingPartySigningBindingElement(new CryptoKeyStoreAsRelyingPartyAssociationStore(cryptoKeyStore ?? new MemoryCryptoKeyStore()));
var extensionFactory = OpenIdExtensionFactoryAggregator.LoadFromConfiguration();
List<IChannelBindingElement> elements = new List<IChannelBindingElement>(8);
elements.Add(new ExtensionsBindingElementRelyingParty(extensionFactory, securitySettings));
elements.Add(new RelyingPartySecurityOptions(securitySettings));
elements.Add(new BackwardCompatibilityBindingElement());
ReturnToNonceBindingElement requestNonceElement = null;
if (cryptoKeyStore != null) {
if (nonceStore != null) {
// There is no point in having a ReturnToNonceBindingElement without
// a ReturnToSignatureBindingElement because the nonce could be
// artificially changed without it.
requestNonceElement = new ReturnToNonceBindingElement(nonceStore, securitySettings);
elements.Add(requestNonceElement);
}
// It is important that the return_to signing element comes last
// so that the nonce is included in the signature.
elements.Add(new ReturnToSignatureBindingElement(cryptoKeyStore));
}
ErrorUtilities.VerifyOperation(!securitySettings.RejectUnsolicitedAssertions || requestNonceElement != null, OpenIdStrings.UnsolicitedAssertionRejectionRequiresNonceStore);
if (nonVerifying) {
elements.Add(new SkipSecurityBindingElement());
} else {
if (nonceStore != null) {
elements.Add(new StandardReplayProtectionBindingElement(nonceStore, true));
}
elements.Add(new StandardExpirationBindingElement());
elements.Add(signingElement);
}
return elements.ToArray();
}
}
}
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