1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
//-----------------------------------------------------------------------
// <copyright file="AssociateDiffieHellmanProviderResponse.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OpenId.Messages {
using System;
using System.Diagnostics.Contracts;
using System.Security.Cryptography;
using DotNetOpenAuth.Messaging;
using DotNetOpenAuth.Messaging.Reflection;
using DotNetOpenAuth.OpenId.Provider;
using Org.Mentalis.Security.Cryptography;
/// <summary>
/// The successful Diffie-Hellman association response message.
/// </summary>
/// <remarks>
/// Association response messages are described in OpenID 2.0 section 8.2. This type covers section 8.2.3.
/// </remarks>
internal class AssociateDiffieHellmanProviderResponse : AssociateDiffieHellmanResponse, IAssociateSuccessfulResponseProvider {
/// <summary>
/// Initializes a new instance of the <see cref="AssociateDiffieHellmanProviderResponse"/> class.
/// </summary>
/// <param name="responseVersion">The OpenID version of the response message.</param>
/// <param name="originatingRequest">The originating request.</param>
internal AssociateDiffieHellmanProviderResponse(Version responseVersion, AssociateDiffieHellmanRequest originatingRequest)
: base(responseVersion, originatingRequest) {
}
/// <summary>
/// Gets or sets the lifetime, in seconds, of this association. The Relying Party MUST NOT use the association after this time has passed.
/// </summary>
/// <value>
/// An integer, represented in base 10 ASCII.
/// </value>
long IAssociateSuccessfulResponseProvider.ExpiresIn {
get { return this.ExpiresIn; }
set { this.ExpiresIn = value; }
}
/// <summary>
/// Gets or sets the association handle is used as a key to refer to this association in subsequent messages.
/// </summary>
/// <value>
/// A string 255 characters or less in length. It MUST consist only of ASCII characters in the range 33-126 inclusive (printable non-whitespace characters).
/// </value>
string IAssociateSuccessfulResponseProvider.AssociationHandle {
get { return this.AssociationHandle; }
set { this.AssociationHandle = value; }
}
/// <summary>
/// Creates the association at the provider side after the association request has been received.
/// </summary>
/// <param name="request">The association request.</param>
/// <param name="associationStore">The OpenID Provider's association store or handle encoder.</param>
/// <param name="securitySettings">The security settings of the Provider.</param>
/// <returns>
/// The newly created association.
/// </returns>
/// <remarks>
/// The response message is updated to include the details of the created association by this method,
/// but the resulting association is <i>not</i> added to the association store and must be done by the caller.
/// </remarks>
public Association CreateAssociationAtProvider(AssociateRequest request, IProviderAssociationStore associationStore, ProviderSecuritySettings securitySettings) {
var diffieHellmanRequest = request as AssociateDiffieHellmanRequest;
ErrorUtilities.VerifyInternal(diffieHellmanRequest != null, "Expected a DH request type.");
this.SessionType = this.SessionType ?? request.SessionType;
// Go ahead and create the association first, complete with its secret that we're about to share.
Association association = HmacShaAssociationProvider.Create(this.Protocol, this.AssociationType, AssociationRelyingPartyType.Smart, associationStore, securitySettings);
// We now need to securely communicate the secret to the relying party using Diffie-Hellman.
// We do this by performing a DH algorithm on the secret and setting a couple of properties
// that will be transmitted to the Relying Party. The RP will perform an inverse operation
// using its part of a DH secret in order to decrypt the shared secret we just invented
// above when we created the association.
using (DiffieHellman dh = new DiffieHellmanManaged(
diffieHellmanRequest.DiffieHellmanModulus ?? AssociateDiffieHellmanRequest.DefaultMod,
diffieHellmanRequest.DiffieHellmanGen ?? AssociateDiffieHellmanRequest.DefaultGen,
AssociateDiffieHellmanRequest.DefaultX)) {
HashAlgorithm hasher = DiffieHellmanUtilities.Lookup(this.Protocol, this.SessionType);
this.DiffieHellmanServerPublic = DiffieHellmanUtilities.EnsurePositive(dh.CreateKeyExchange());
this.EncodedMacKey = DiffieHellmanUtilities.SHAHashXorSecret(hasher, dh, diffieHellmanRequest.DiffieHellmanConsumerPublic, association.SecretKey);
}
return association;
}
}
}
|
