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//-----------------------------------------------------------------------
// <copyright file="HmacShaAssociationProvider.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OpenId.Provider {
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using DotNetOpenAuth.Messaging;
using DotNetOpenAuth.OpenId.Provider;
using Validation;
/// <summary>
/// OpenID Provider utility methods for HMAC-SHA* associations.
/// </summary>
internal static class HmacShaAssociationProvider {
/// <summary>
/// The default lifetime of a shared association when no lifetime is given
/// for a specific association type.
/// </summary>
private static readonly TimeSpan DefaultMaximumLifetime = TimeSpan.FromDays(14);
/// <summary>
/// Creates a new association of a given type at an OpenID Provider.
/// </summary>
/// <param name="protocol">The protocol.</param>
/// <param name="associationType">Type of the association (i.e. HMAC-SHA1 or HMAC-SHA256)</param>
/// <param name="associationUse">A value indicating whether the new association will be used privately by the Provider for "dumb mode" authentication
/// or shared with the Relying Party for "smart mode" authentication.</param>
/// <param name="associationStore">The Provider's association store.</param>
/// <param name="securitySettings">The security settings of the Provider.</param>
/// <returns>
/// The newly created association.
/// </returns>
/// <remarks>
/// The new association is NOT automatically put into an association store. This must be done by the caller.
/// </remarks>
internal static HmacShaAssociation Create(Protocol protocol, string associationType, AssociationRelyingPartyType associationUse, IProviderAssociationStore associationStore, ProviderSecuritySettings securitySettings) {
Requires.NotNull(protocol, "protocol");
Requires.NotNullOrEmpty(associationType, "associationType");
Requires.NotNull(associationStore, "associationStore");
Requires.NotNull(securitySettings, "securitySettings");
int secretLength = HmacShaAssociation.GetSecretLength(protocol, associationType);
// Generate the secret that will be used for signing
byte[] secret = MessagingUtilities.GetCryptoRandomData(secretLength);
TimeSpan lifetime;
if (associationUse == AssociationRelyingPartyType.Smart) {
if (!securitySettings.AssociationLifetimes.TryGetValue(associationType, out lifetime)) {
lifetime = DefaultMaximumLifetime;
}
} else {
lifetime = HmacShaAssociation.DumbSecretLifetime;
}
string handle = associationStore.Serialize(secret, DateTime.UtcNow + lifetime, associationUse == AssociationRelyingPartyType.Dumb);
Assumes.True(protocol != null); // All the way up to the method call, the condition holds, yet we get a Requires failure next
Assumes.True(secret != null);
Assumes.True(!string.IsNullOrEmpty(associationType));
var result = HmacShaAssociation.Create(protocol, associationType, handle, secret, lifetime);
return result;
}
}
}
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