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
|
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package javax.net.ssl;
import java.net.InetAddress;
import java.security.cert.Certificate;
import java.security.cert.CertificateParsingException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import javax.security.auth.x500.X500Principal;
/**
* A HostnameVerifier consistent with <a
* href="http://www.ietf.org/rfc/rfc2818.txt">RFC 2818</a>.
*
* @hide accessible via HttpsURLConnection.getDefaultHostnameVerifier()
*/
public final class DefaultHostnameVerifier implements HostnameVerifier {
private static final int ALT_DNS_NAME = 2;
private static final int ALT_IPA_NAME = 7;
public final boolean verify(String host, SSLSession session) {
try {
Certificate[] certificates = session.getPeerCertificates();
return verify(host, (X509Certificate) certificates[0]);
} catch (SSLException e) {
return false;
}
}
public boolean verify(String host, X509Certificate certificate) {
return InetAddress.isNumeric(host)
? verifyIpAddress(host, certificate)
: verifyHostName(host, certificate);
}
/**
* Returns true if {@code certificate} matches {@code ipAddress}.
*/
private boolean verifyIpAddress(String ipAddress, X509Certificate certificate) {
for (String altName : getSubjectAltNames(certificate, ALT_IPA_NAME)) {
if (ipAddress.equalsIgnoreCase(altName)) {
return true;
}
}
return false;
}
/**
* Returns true if {@code certificate} matches {@code hostName}.
*/
private boolean verifyHostName(String hostName, X509Certificate certificate) {
hostName = hostName.toLowerCase(Locale.US);
boolean hasDns = false;
for (String altName : getSubjectAltNames(certificate, ALT_DNS_NAME)) {
hasDns = true;
if (verifyHostName(hostName, altName)) {
return true;
}
}
if (!hasDns) {
X500Principal principal = certificate.getSubjectX500Principal();
// RFC 2818 advises using the most specific name for matching.
String cn = new DistinguishedNameParser(principal).findMostSpecific("cn");
if (cn != null) {
return verifyHostName(hostName, cn);
}
}
return false;
}
private List<String> getSubjectAltNames(X509Certificate certificate, int type) {
List<String> result = new ArrayList<String>();
try {
Collection<?> subjectAltNames = certificate.getSubjectAlternativeNames();
if (subjectAltNames == null) {
return Collections.emptyList();
}
for (Object subjectAltName : subjectAltNames) {
List<?> entry = (List<?>) subjectAltName;
if (entry == null || entry.size() < 2) {
continue;
}
Integer altNameType = (Integer) entry.get(0);
if (altNameType == null) {
continue;
}
if (altNameType == type) {
String altName = (String) entry.get(1);
if (altName != null) {
result.add(altName);
}
}
}
return result;
} catch (CertificateParsingException e) {
return Collections.emptyList();
}
}
/**
* Returns true if {@code hostName} matches the name or pattern {@code cn}.
*
* @param hostName lowercase host name.
* @param cn certificate host name. May include wildcards like
* {@code *.android.com}.
*/
public boolean verifyHostName(String hostName, String cn) {
if (hostName == null || hostName.isEmpty() || cn == null || cn.isEmpty()) {
return false;
}
cn = cn.toLowerCase(Locale.US);
if (!cn.contains("*")) {
return hostName.equals(cn);
}
if (cn.startsWith("*.") && hostName.regionMatches(0, cn, 2, cn.length() - 2)) {
return true; // "*.foo.com" matches "foo.com"
}
int asterisk = cn.indexOf('*');
int dot = cn.indexOf('.');
if (asterisk > dot) {
return false; // malformed; wildcard must be in the first part of the cn
}
if (!hostName.regionMatches(0, cn, 0, asterisk)) {
return false; // prefix before '*' doesn't match
}
int suffixLength = cn.length() - (asterisk + 1);
int suffixStart = hostName.length() - suffixLength;
if (hostName.indexOf('.', asterisk) < suffixStart) {
// TODO: remove workaround for *.clients.google.com http://b/5426333
if (!hostName.endsWith(".clients.google.com")) {
return false; // wildcard '*' can't match a '.'
}
}
if (!hostName.regionMatches(suffixStart, cn, asterisk + 1, suffixLength)) {
return false; // suffix after '*' doesn't match
}
return true;
}
}
|
