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
|
//----------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.ServiceModel
{
using System;
using System.DirectoryServices;
using System.IdentityModel.Claims;
using System.Runtime;
using System.Runtime.InteropServices;
using System.Security.Principal;
using System.ServiceModel.Diagnostics;
using System.ServiceModel.Security;
using System.Xml;
public class SpnEndpointIdentity : EndpointIdentity
{
static TimeSpan spnLookupTime = TimeSpan.FromMinutes(1);
SecurityIdentifier spnSid;
// Double-checked locking pattern requires volatile for read/write synchronization
volatile bool hasSpnSidBeenComputed;
Object thisLock = new Object();
static Object typeLock = new Object();
// Double-checked locking pattern requires volatile for read/write synchronization
static volatile DirectoryEntry directoryEntry;
public static TimeSpan SpnLookupTime
{
get
{
return spnLookupTime;
}
set
{
if (value.Ticks < 0)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("value", value.Ticks,
SR.GetString(SR.ValueMustBeNonNegative)));
}
spnLookupTime = value;
}
}
public SpnEndpointIdentity(string spnName)
{
if (spnName == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("spnName");
base.Initialize(Claim.CreateSpnClaim(spnName));
}
public SpnEndpointIdentity(Claim identity)
{
if (identity == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("identity");
// PreSharp Bug: Parameter 'identity.ResourceType' to this public method must be validated: A null-dereference can occur here.
#pragma warning suppress 56506 // Claim.ClaimType will never return null
if (!identity.ClaimType.Equals(ClaimTypes.Spn))
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.UnrecognizedClaimTypeForIdentity, identity.ClaimType, ClaimTypes.Spn));
base.Initialize(identity);
}
internal override void WriteContentsTo(XmlDictionaryWriter writer)
{
if (writer == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("writer");
writer.WriteElementString(XD.AddressingDictionary.Spn, XD.AddressingDictionary.IdentityExtensionNamespace, (string)this.IdentityClaim.Resource);
}
internal SecurityIdentifier GetSpnSid()
{
Fx.Assert(ClaimTypes.Spn.Equals(this.IdentityClaim.ClaimType) || ClaimTypes.Dns.Equals(this.IdentityClaim.ClaimType), "");
if (!hasSpnSidBeenComputed)
{
lock (thisLock)
{
if (!hasSpnSidBeenComputed)
{
string spn = null;
try
{
if (ClaimTypes.Dns.Equals(this.IdentityClaim.ClaimType))
{
spn = "host/" + (string)this.IdentityClaim.Resource;
}
else
{
spn = (string)this.IdentityClaim.Resource;
}
// canonicalize SPN for use in LDAP filter following RFC 1960:
if (spn != null)
{
spn = spn.Replace("*", @"\*").Replace("(", @"\(").Replace(")", @"\)");
}
DirectoryEntry de = GetDirectoryEntry();
using (DirectorySearcher searcher = new DirectorySearcher(de))
{
searcher.CacheResults = true;
searcher.ClientTimeout = SpnLookupTime;
searcher.Filter = "(&(objectCategory=Computer)(objectClass=computer)(servicePrincipalName=" + spn + "))";
searcher.PropertiesToLoad.Add("objectSid");
SearchResult result = searcher.FindOne();
if (result != null)
{
byte[] sidBinaryForm = (byte[])result.Properties["objectSid"][0];
this.spnSid = new SecurityIdentifier(sidBinaryForm, 0);
}
else
{
SecurityTraceRecordHelper.TraceSpnToSidMappingFailure(spn, null);
}
}
}
#pragma warning suppress 56500 // covered by FxCOP
catch (Exception e)
{
// Always immediately rethrow fatal exceptions.
if (Fx.IsFatal(e)) throw;
if (e is NullReferenceException || e is SEHException)
throw;
SecurityTraceRecordHelper.TraceSpnToSidMappingFailure(spn, e);
}
finally
{
hasSpnSidBeenComputed = true;
}
}
}
}
return this.spnSid;
}
static DirectoryEntry GetDirectoryEntry()
{
if (directoryEntry == null)
{
lock (typeLock)
{
if (directoryEntry == null)
{
DirectoryEntry tmp = new DirectoryEntry(@"LDAP://" + SecurityUtils.GetPrimaryDomain());
tmp.RefreshCache(new string[] { "name" });
directoryEntry = tmp;
}
}
}
return directoryEntry;
}
}
}
|
