-
Notifications
You must be signed in to change notification settings - Fork 5.4k
/
ManifestEntryVerifier.java
288 lines (244 loc) · 9.58 KB
/
ManifestEntryVerifier.java
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
/*
* Copyright (c) 1997, 2020, 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.util;
import java.security.*;
import java.io.*;
import java.util.*;
import java.util.jar.*;
import sun.security.jca.Providers;
import sun.security.util.DisabledAlgorithmConstraints;
import sun.security.util.JarConstraintsParameters;
/**
* This class is used to verify each entry in a jar file with its
* manifest value.
*/
public class ManifestEntryVerifier {
private static final Debug debug = Debug.getInstance("jar");
/**
* Holder class to lazily load Sun provider. NOTE: if
* Providers.getSunProvider returned a cached provider, we could avoid the
* need for caching the provider with this holder class; we should try to
* revisit this in JDK 8.
*/
private static class SunProviderHolder {
private static final Provider instance = Providers.getSunProvider();
}
/** the created digest objects */
HashMap<String, MessageDigest> createdDigests;
/** the digests in use for a given entry*/
ArrayList<MessageDigest> digests;
/** the manifest hashes for the digests in use */
ArrayList<byte[]> manifestHashes;
private String name = null;
private final String manifestFileName; // never null
private final Manifest man;
private boolean skip = true;
private JarEntry entry;
private CodeSigner[] signers = null;
/**
* Create a new ManifestEntryVerifier object.
*/
public ManifestEntryVerifier(Manifest man, String manifestFileName)
{
createdDigests = new HashMap<>(11);
digests = new ArrayList<>();
manifestHashes = new ArrayList<>();
this.manifestFileName = manifestFileName;
this.man = man;
}
/**
* Find the hashes in the
* manifest for this entry, save them, and set the MessageDigest
* objects to calculate the hashes on the fly. If name is
* null it signifies that update/verify should ignore this entry.
*/
public void setEntry(String name, JarEntry entry)
throws IOException
{
digests.clear();
manifestHashes.clear();
this.name = name;
this.entry = entry;
skip = true;
signers = null;
if (man == null || name == null) {
return;
}
/* get the headers from the manifest for this entry */
/* if there aren't any, we can't verify any digests for this entry */
skip = false;
Attributes attr = man.getAttributes(name);
if (attr == null) {
// ugh. we should be able to remove this at some point.
// there are broken jars floating around with ./name and /name
// in the manifest, and "name" in the zip/jar file.
attr = man.getAttributes("./"+name);
if (attr == null) {
attr = man.getAttributes("/"+name);
if (attr == null)
return;
}
}
for (Map.Entry<Object,Object> se : attr.entrySet()) {
String key = se.getKey().toString();
if (key.toUpperCase(Locale.ENGLISH).endsWith("-DIGEST")) {
// 7 is length of "-Digest"
String algorithm = key.substring(0, key.length()-7);
MessageDigest digest = createdDigests.get(algorithm);
if (digest == null) {
try {
digest = MessageDigest.getInstance
(algorithm, SunProviderHolder.instance);
createdDigests.put(algorithm, digest);
} catch (NoSuchAlgorithmException nsae) {
// ignore
}
}
if (digest != null) {
digest.reset();
digests.add(digest);
manifestHashes.add(
Base64.getMimeDecoder().decode((String)se.getValue()));
}
}
}
}
/**
* update the digests for the digests we are interested in
*/
public void update(byte buffer) {
if (skip) return;
for (int i=0; i < digests.size(); i++) {
digests.get(i).update(buffer);
}
}
/**
* update the digests for the digests we are interested in
*/
public void update(byte[] buffer, int off, int len) {
if (skip) return;
for (int i=0; i < digests.size(); i++) {
digests.get(i).update(buffer, off, len);
}
}
/**
* get the JarEntry for this object
*/
public JarEntry getEntry()
{
return entry;
}
/**
* go through all the digests, calculating the final digest
* and comparing it to the one in the manifest. If this is
* the first time we have verified this object, remove its
* code signers from sigFileSigners and place in verifiedSigners.
*
*/
public CodeSigner[] verify(Hashtable<String, CodeSigner[]> verifiedSigners,
Hashtable<String, CodeSigner[]> sigFileSigners)
throws JarException
{
if (skip) {
return null;
}
if (digests.isEmpty()) {
throw new SecurityException("digest missing for " + name);
}
if (signers != null) {
return signers;
}
JarConstraintsParameters params =
getParams(verifiedSigners, sigFileSigners);
for (int i=0; i < digests.size(); i++) {
MessageDigest digest = digests.get(i);
if (params != null) {
try {
params.setExtendedExceptionMsg(JarFile.MANIFEST_NAME,
name + " entry");
DisabledAlgorithmConstraints.jarConstraints()
.permits(digest.getAlgorithm(), params);
} catch (GeneralSecurityException e) {
if (debug != null) {
debug.println("Digest algorithm is restricted: " + e);
}
return null;
}
}
byte [] manHash = manifestHashes.get(i);
byte [] theHash = digest.digest();
if (debug != null) {
debug.println("Manifest Entry: " +
name + " digest=" + digest.getAlgorithm());
debug.println(" manifest " + HexFormat.of().formatHex(manHash));
debug.println(" computed " + HexFormat.of().formatHex(theHash));
debug.println();
}
if (!MessageDigest.isEqual(theHash, manHash))
throw new SecurityException(digest.getAlgorithm()+
" digest error for "+name);
}
// take it out of sigFileSigners and put it in verifiedSigners...
signers = sigFileSigners.remove(name);
if (signers != null) {
verifiedSigners.put(name, signers);
}
return signers;
}
/**
* Get constraints parameters for JAR. The constraints should be
* checked against all code signers. Returns the parameters,
* or null if the signers for this entry have already been checked
* or there are no signers for this entry.
*/
private JarConstraintsParameters getParams(
Map<String, CodeSigner[]> verifiedSigners,
Map<String, CodeSigner[]> sigFileSigners) {
// verifiedSigners is usually preloaded with the Manifest's signers.
// If verifiedSigners contains the Manifest, then it will have all of
// the signers of the JAR. But if it doesn't then we need to fallback
// and check verifiedSigners to see if the signers of this entry have
// been checked already.
if (verifiedSigners.containsKey(manifestFileName)) {
if (verifiedSigners.size() > 1) {
// this means we already checked it previously
return null;
} else {
return new JarConstraintsParameters(
verifiedSigners.get(manifestFileName));
}
} else {
if (debug != null) {
debug.println(manifestFileName + " not present in verifiedSigners");
}
CodeSigner[] signers = sigFileSigners.get(name);
if (signers == null || verifiedSigners.containsValue(signers)) {
return null;
} else {
return new JarConstraintsParameters(signers);
}
}
}
}