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
|
/*
* Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.security.jgss.krb5;
import com.sun.security.jgss.AuthorizationDataEntry;
import org.ietf.jgss.*;
import java.io.InputStream;
import java.io.IOException;
import sun.security.action.GetPropertyAction;
import sun.security.krb5.*;
import java.net.InetAddress;
import sun.security.krb5.internal.AuthorizationData;
import sun.security.krb5.internal.KerberosTime;
class InitSecContextToken extends InitialToken {
// If non-mutual authentication is requested, there is no AP-REP message.
// The acceptor thus has no chance to send the seq-number field to the
// initiator. In this case, the initiator and acceptor should has an
// agreement to derive acceptor's initial seq-number if the acceptor wishes
// to send messages to the initiator.
// If this flag is true, it will the same as the initiator's initial
// seq-number (as MIT krb5 and Windows SSPI do). Otherwise, it will be zero
// (as Heimdal does). The default value is true.
private static final boolean ACCEPTOR_USE_INITIATOR_SEQNUM;
static {
// The ACCEPTOR_USE_INITIATOR_SEQNUM value is determined by the system
// property "sun.security.krb5.acceptor.sequence.number.nonmutual",
// which can be set to "initiator", "zero" or "0".
String propName = "sun.security.krb5.acceptor.sequence.number.nonmutual";
String s = GetPropertyAction.privilegedGetProperty(propName, "initiator");
if (s.equals("initiator")) {
ACCEPTOR_USE_INITIATOR_SEQNUM = true;
} else if (s.equals("zero") || s.equals("0")) {
ACCEPTOR_USE_INITIATOR_SEQNUM = false;
} else {
throw new AssertionError("Unrecognized value for " + propName
+ ": " + s);
}
}
private KrbApReq apReq = null;
/**
* For the context initiator to call. It constructs a new
* InitSecContextToken to send over to the peer containing the desired
* flags and the AP-REQ. It also updates the context with the local
* sequence number and shared context key.
* (When mutual auth is enabled the peer has an opportunity to
* renegotiate the session key in the followup AcceptSecContextToken
* that it sends.)
*/
InitSecContextToken(Krb5Context context,
Credentials tgt,
Credentials serviceTicket)
throws KrbException, IOException, GSSException {
boolean mutualRequired = context.getMutualAuthState();
boolean useSubkey = true; // MIT Impl will crash if this is not set!
boolean useSequenceNumber = true;
OverloadedChecksum gssChecksum =
new OverloadedChecksum(context, tgt, serviceTicket);
Checksum checksum = gssChecksum.getChecksum();
context.setTktFlags(serviceTicket.getFlags());
context.setAuthTime(
new KerberosTime(serviceTicket.getAuthTime()).toString());
apReq = new KrbApReq(serviceTicket,
mutualRequired,
useSubkey,
useSequenceNumber,
checksum);
context.resetMySequenceNumber(apReq.getSeqNumber().intValue());
EncryptionKey subKey = apReq.getSubKey();
if (subKey != null)
context.setKey(Krb5Context.INITIATOR_SUBKEY, subKey);
else
context.setKey(Krb5Context.SESSION_KEY, serviceTicket.getSessionKey());
if (!mutualRequired)
context.resetPeerSequenceNumber(
ACCEPTOR_USE_INITIATOR_SEQNUM
? apReq.getSeqNumber().intValue()
: 0);
}
/**
* For the context acceptor to call. It reads the bytes out of an
* InputStream and constructs an InitSecContextToken with them.
*/
InitSecContextToken(Krb5Context context, Krb5AcceptCredential cred,
InputStream is)
throws IOException, GSSException, KrbException {
int tokenId = ((is.read()<<8) | is.read());
if (tokenId != Krb5Token.AP_REQ_ID)
throw new GSSException(GSSException.DEFECTIVE_TOKEN, -1,
"AP_REQ token id does not match!");
// XXX Modify KrbApReq cons to take an InputStream
byte[] apReqBytes =
new sun.security.util.DerValue(is).toByteArray();
//debug("=====ApReqBytes: [" + getHexBytes(apReqBytes) + "]\n");
InetAddress addr = null;
if (context.getChannelBinding() != null) {
addr = context.getChannelBinding().getInitiatorAddress();
}
apReq = new KrbApReq(apReqBytes, cred, addr);
//debug("\nReceived AP-REQ and authenticated it.\n");
EncryptionKey sessionKey = apReq.getCreds().getSessionKey();
/*
System.out.println("\n\nSession key from service ticket is: " +
getHexBytes(sessionKey.getBytes()));
*/
EncryptionKey subKey = apReq.getSubKey();
if (subKey != null) {
context.setKey(Krb5Context.INITIATOR_SUBKEY, subKey);
/*
System.out.println("Sub-Session key from authenticator is: " +
getHexBytes(subKey.getBytes()) + "\n");
*/
} else {
context.setKey(Krb5Context.SESSION_KEY, sessionKey);
//System.out.println("Sub-Session Key Missing in Authenticator.\n");
}
OverloadedChecksum gssChecksum = new OverloadedChecksum(
context, apReq.getChecksum(), sessionKey, subKey);
gssChecksum.setContextFlags(context);
Credentials delegCred = gssChecksum.getDelegatedCreds();
if (delegCred != null) {
Krb5CredElement credElement =
Krb5InitCredential.getInstance(
(Krb5NameElement)context.getSrcName(),
delegCred);
context.setDelegCred(credElement);
}
Integer apReqSeqNumber = apReq.getSeqNumber();
int peerSeqNumber = (apReqSeqNumber != null ?
apReqSeqNumber.intValue() :
0);
context.resetPeerSequenceNumber(peerSeqNumber);
if (!context.getMutualAuthState()) {
context.resetMySequenceNumber(
ACCEPTOR_USE_INITIATOR_SEQNUM
? peerSeqNumber
: 0);
}
context.setAuthTime(
new KerberosTime(apReq.getCreds().getAuthTime()).toString());
context.setTktFlags(apReq.getCreds().getFlags());
AuthorizationData ad = apReq.getCreds().getAuthzData();
if (ad == null) {
context.setAuthzData(null);
} else {
AuthorizationDataEntry[] authzData =
new AuthorizationDataEntry[ad.count()];
for (int i=0; i<ad.count(); i++) {
authzData[i] = new AuthorizationDataEntry(
ad.item(i).adType, ad.item(i).adData);
}
context.setAuthzData(authzData);
}
}
public final KrbApReq getKrbApReq() {
return apReq;
}
public final byte[] encode() throws IOException {
byte[] apReqBytes = apReq.getMessage();
byte[] retVal = new byte[2 + apReqBytes.length];
writeInt(Krb5Token.AP_REQ_ID, retVal, 0);
System.arraycopy(apReqBytes, 0, retVal, 2, apReqBytes.length);
// System.out.println("GSS-Token with AP_REQ is:");
// System.out.println(getHexBytes(retVal));
return retVal;
}
}
|
