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
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
|
//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.ServiceModel.Security.Tokens
{
using System.Collections;
using System.ServiceModel;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Globalization;
using System.IO;
using System.IdentityModel.Claims;
using System.IdentityModel.Policy;
using System.IdentityModel.Tokens;
using System.IdentityModel.Selectors;
using System.Security.Cryptography;
using System.Text;
using System.Xml;
sealed class DerivedKeySecurityToken : SecurityToken
{
// public const string DefaultLabel = "WS-SecureConversationWS-SecureConversation";
static readonly byte[] DefaultLabel = new byte[]
{
(byte)'W', (byte)'S', (byte)'-', (byte)'S', (byte)'e', (byte)'c', (byte)'u', (byte)'r', (byte)'e',
(byte)'C', (byte)'o', (byte)'n', (byte)'v', (byte)'e', (byte)'r', (byte)'s', (byte)'a', (byte)'t', (byte)'i', (byte)'o', (byte)'n',
(byte)'W', (byte)'S', (byte)'-', (byte)'S', (byte)'e', (byte)'c', (byte)'u', (byte)'r', (byte)'e',
(byte)'C', (byte)'o', (byte)'n', (byte)'v', (byte)'e', (byte)'r', (byte)'s', (byte)'a', (byte)'t', (byte)'i', (byte)'o', (byte)'n'
};
public const int DefaultNonceLength = 16;
public const int DefaultDerivedKeyLength = 32;
string id;
byte[] key;
string keyDerivationAlgorithm;
string label;
int length = -1;
byte[] nonce;
// either offset or generation must be specified.
int offset = -1;
int generation = -1;
SecurityToken tokenToDerive;
SecurityKeyIdentifierClause tokenToDeriveIdentifier;
ReadOnlyCollection<SecurityKey> securityKeys;
// create from scratch
public DerivedKeySecurityToken(SecurityToken tokenToDerive, SecurityKeyIdentifierClause tokenToDeriveIdentifier, int length)
: this(tokenToDerive, tokenToDeriveIdentifier, length, SecurityUtils.GenerateId())
{
}
internal DerivedKeySecurityToken(SecurityToken tokenToDerive, SecurityKeyIdentifierClause tokenToDeriveIdentifier,
int length, string id)
{
if (length != 16 && length != 24 && length != 32)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR.GetString(SR.Psha1KeyLengthInvalid, length * 8)));
byte[] nonce = new byte[DefaultNonceLength];
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
rng.GetBytes(nonce);
Initialize(id, -1, 0, length, null, nonce, tokenToDerive, tokenToDeriveIdentifier, SecurityAlgorithms.Psha1KeyDerivation);
}
internal DerivedKeySecurityToken(int generation, int offset, int length,
string label, int minNonceLength, SecurityToken tokenToDerive,
SecurityKeyIdentifierClause tokenToDeriveIdentifier,
string derivationAlgorithm, string id)
{
byte[] nonce = new byte[minNonceLength];
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
rng.GetBytes(nonce);
Initialize(id, generation, offset, length, label, nonce, tokenToDerive, tokenToDeriveIdentifier, derivationAlgorithm);
}
// create from xml
internal DerivedKeySecurityToken(int generation, int offset, int length,
string label, byte[] nonce, SecurityToken tokenToDerive,
SecurityKeyIdentifierClause tokenToDeriveIdentifier, string derivationAlgorithm, string id)
{
Initialize(id, generation, offset, length, label, nonce, tokenToDerive, tokenToDeriveIdentifier, derivationAlgorithm, false);
}
public override string Id
{
get { return this.id; }
}
public override DateTime ValidFrom
{
get { return this.tokenToDerive.ValidFrom; }
}
public override DateTime ValidTo
{
get { return this.tokenToDerive.ValidTo; }
}
public string KeyDerivationAlgorithm
{
get { return keyDerivationAlgorithm; }
}
public int Generation
{
get { return this.generation; }
}
public string Label
{
get { return this.label; }
}
public int Length
{
get { return this.length; }
}
internal byte[] Nonce
{
get { return this.nonce; }
}
public int Offset
{
get { return this.offset; }
}
internal SecurityToken TokenToDerive
{
get { return this.tokenToDerive; }
}
internal SecurityKeyIdentifierClause TokenToDeriveIdentifier
{
get { return this.tokenToDeriveIdentifier; }
}
public override ReadOnlyCollection<SecurityKey> SecurityKeys
{
get
{
if (this.securityKeys == null)
{
#pragma warning suppress 56503
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.DerivedKeyNotInitialized)));
}
return this.securityKeys;
}
}
public byte[] GetKeyBytes()
{
return SecurityUtils.CloneBuffer(this.key);
}
public byte[] GetNonce()
{
return SecurityUtils.CloneBuffer(this.nonce);
}
internal bool TryGetSecurityKeys(out ReadOnlyCollection<SecurityKey> keys)
{
keys = this.securityKeys;
return (keys != null);
}
public override string ToString()
{
StringWriter writer = new StringWriter(CultureInfo.InvariantCulture);
writer.WriteLine("DerivedKeySecurityToken:");
writer.WriteLine(" Generation: {0}", this.Generation);
writer.WriteLine(" Offset: {0}", this.Offset);
writer.WriteLine(" Length: {0}", this.Length);
writer.WriteLine(" Label: {0}", this.Label);
writer.WriteLine(" Nonce: {0}", Convert.ToBase64String(this.Nonce));
writer.WriteLine(" TokenToDeriveFrom:");
using (XmlTextWriter xmlWriter = new XmlTextWriter(writer))
{
xmlWriter.Formatting = Formatting.Indented;
SecurityStandardsManager.DefaultInstance.SecurityTokenSerializer.WriteKeyIdentifierClause(XmlDictionaryWriter.CreateDictionaryWriter(xmlWriter), this.TokenToDeriveIdentifier);
}
return writer.ToString();
}
void Initialize(string id, int generation, int offset, int length, string label, byte[] nonce,
SecurityToken tokenToDerive, SecurityKeyIdentifierClause tokenToDeriveIdentifier, string derivationAlgorithm)
{
Initialize(id, generation, offset, length, label, nonce, tokenToDerive, tokenToDeriveIdentifier, derivationAlgorithm, true);
}
void Initialize(string id, int generation, int offset, int length, string label, byte[] nonce,
SecurityToken tokenToDerive, SecurityKeyIdentifierClause tokenToDeriveIdentifier, string derivationAlgorithm,
bool initializeDerivedKey)
{
if (id == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("id");
}
if (tokenToDerive == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("tokenToDerive");
}
if (tokenToDeriveIdentifier == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("tokentoDeriveIdentifier");
}
if (!SecurityUtils.IsSupportedAlgorithm(derivationAlgorithm, tokenToDerive))
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR.GetString(SR.DerivedKeyCannotDeriveFromSecret)));
}
if (nonce == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("nonce");
}
if (length == -1)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("length"));
}
if (offset == -1 && generation == -1)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.DerivedKeyPosAndGenNotSpecified));
}
if (offset >= 0 && generation >= 0)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.DerivedKeyPosAndGenBothSpecified));
}
this.id = id;
this.label = label;
this.nonce = nonce;
this.length = length;
this.offset = offset;
this.generation = generation;
this.tokenToDerive = tokenToDerive;
this.tokenToDeriveIdentifier = tokenToDeriveIdentifier;
this.keyDerivationAlgorithm = derivationAlgorithm;
if (initializeDerivedKey)
{
InitializeDerivedKey(this.length);
}
}
internal void InitializeDerivedKey(int maxKeyLength)
{
if (this.key != null)
{
return;
}
if (this.length > maxKeyLength)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.DerivedKeyLengthTooLong, this.length, maxKeyLength));
}
this.key = SecurityUtils.GenerateDerivedKey(this.tokenToDerive, this.keyDerivationAlgorithm,
(this.label != null ? Encoding.UTF8.GetBytes(this.label) : DefaultLabel), this.nonce, this.length * 8,
((this.offset >= 0) ? this.offset : this.generation * this.length));
if ((this.key == null) || (this.key.Length == 0))
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.DerivedKeyCannotDeriveFromSecret));
}
List<SecurityKey> temp = new List<SecurityKey>(1);
temp.Add(new InMemorySymmetricSecurityKey(this.key, false));
this.securityKeys = temp.AsReadOnly();
}
internal void InitializeDerivedKey(ReadOnlyCollection<SecurityKey> securityKeys)
{
this.key = ((SymmetricSecurityKey)securityKeys[0]).GetSymmetricKey();
this.securityKeys = securityKeys;
}
internal static void EnsureAcceptableOffset(int offset, int generation, int length, int maxOffset)
{
if (offset != -1)
{
if (offset > maxOffset)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new MessageSecurityException(SR.GetString(SR.DerivedKeyTokenOffsetTooHigh, offset, maxOffset)));
}
}
else
{
int effectiveOffset = generation * length;
if ((effectiveOffset < generation && effectiveOffset < length) || effectiveOffset > maxOffset)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new MessageSecurityException(SR.GetString(SR.DerivedKeyTokenGenerationAndLengthTooHigh, generation, length, maxOffset)));
}
}
}
}
}
|
