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| 1 | /* | ||
| 2 | * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.security.util; | ||
| 27 | |||
| 28 | import java.security.*; | ||
| 29 | import java.io.*; | ||
| 30 | import java.security.CodeSigner; | ||
| 31 | import java.util.*; | ||
| 32 | import java.util.jar.*; | ||
| 33 | |||
| 34 | import sun.misc.BASE64Decoder; | ||
| 35 | |||
| 36 | import sun.security.jca.Providers; | ||
| 37 | |||
| 38 | /** | ||
| 39 | * This class is used to verify each entry in a jar file with its | ||
| 40 | * manifest value. | ||
| 41 | */ | ||
| 42 | |||
| 43 | public class ManifestEntryVerifier { | ||
| 44 | |||
| 45 | private static final Debug debug = Debug.getInstance("jar"); | ||
| 46 | |||
| 47 | /** | ||
| 48 | * Holder class to lazily load Sun provider. NOTE: if | ||
| 49 | * Providers.getSunProvider returned a cached provider, we could avoid the | ||
| 50 | * need for caching the provider with this holder class; we should try to | ||
| 51 | * revisit this in JDK 8. | ||
| 52 | */ | ||
| 53 | private static class SunProviderHolder { | ||
| 54 | private static final Provider instance = Providers.getSunProvider(); | ||
| 55 | } | ||
| 56 | |||
| 57 | /** the created digest objects */ | ||
| 58 | HashMap<String, MessageDigest> createdDigests; | ||
| 59 | |||
| 60 | /** the digests in use for a given entry*/ | ||
| 61 | ArrayList<MessageDigest> digests; | ||
| 62 | |||
| 63 | /** the manifest hashes for the digests in use */ | ||
| 64 | ArrayList<byte[]> manifestHashes; | ||
| 65 | |||
| 66 | private BASE64Decoder decoder = null; | ||
| 67 | private String name = null; | ||
| 68 | private Manifest man; | ||
| 69 | |||
| 70 | private boolean skip = true; | ||
| 71 | |||
| 72 | private JarEntry entry; | ||
| 73 | |||
| 74 | private CodeSigner[] signers = null; | ||
| 75 | |||
| 76 | /** | ||
| 77 | * Create a new ManifestEntryVerifier object. | ||
| 78 | */ | ||
| 79 | public ManifestEntryVerifier(Manifest man) | ||
| 80 | { | ||
| 81 | createdDigests = new HashMap<String, MessageDigest>(11); | ||
| 82 | digests = new ArrayList<MessageDigest>(); | ||
| 83 | manifestHashes = new ArrayList<byte[]>(); | ||
| 84 | decoder = new BASE64Decoder(); | ||
| 85 | this.man = man; | ||
| 86 | } | ||
| 87 | |||
| 88 | /** | ||
| 89 | * Find the hashes in the | ||
| 90 | * manifest for this entry, save them, and set the MessageDigest | ||
| 91 | * objects to calculate the hashes on the fly. If name is | ||
| 92 | * null it signifies that update/verify should ignore this entry. | ||
| 93 | */ | ||
| 94 | public void setEntry(String name, JarEntry entry) | ||
| 95 | throws IOException | ||
| 96 | { | ||
| 97 | digests.clear(); | ||
| 98 | manifestHashes.clear(); | ||
| 99 | this.name = name; | ||
| 100 | this.entry = entry; | ||
| 101 | |||
| 102 | skip = true; | ||
| 103 | signers = null; | ||
| 104 | |||
| 105 | if (man == null || name == null) { | ||
| 106 | return; | ||
| 107 | } | ||
| 108 | |||
| 109 | /* get the headers from the manifest for this entry */ | ||
| 110 | /* if there aren't any, we can't verify any digests for this entry */ | ||
| 111 | |||
| 112 | Attributes attr = man.getAttributes(name); | ||
| 113 | if (attr == null) { | ||
| 114 | // ugh. we should be able to remove this at some point. | ||
| 115 | // there are broken jars floating around with ./name and /name | ||
| 116 | // in the manifest, and "name" in the zip/jar file. | ||
| 117 | attr = man.getAttributes("./"+name); | ||
| 118 | if (attr == null) { | ||
| 119 | attr = man.getAttributes("/"+name); | ||
| 120 | if (attr == null) | ||
| 121 | return; | ||
| 122 | } | ||
| 123 | } | ||
| 124 | |||
| 125 | for (Map.Entry<Object,Object> se : attr.entrySet()) { | ||
| 126 | String key = se.getKey().toString(); | ||
| 127 | |||
| 128 | if (key.toUpperCase(Locale.ENGLISH).endsWith("-DIGEST")) { | ||
| 129 | // 7 is length of "-Digest" | ||
| 130 | String algorithm = key.substring(0, key.length()-7); | ||
| 131 | |||
| 132 | MessageDigest digest = createdDigests.get(algorithm); | ||
| 133 | |||
| 134 | if (digest == null) { | ||
| 135 | try { | ||
| 136 | |||
| 137 | digest = MessageDigest.getInstance | ||
| 138 | (algorithm, SunProviderHolder.instance); | ||
| 139 | createdDigests.put(algorithm, digest); | ||
| 140 | } catch (NoSuchAlgorithmException nsae) { | ||
| 141 | // ignore | ||
| 142 | } | ||
| 143 | } | ||
| 144 | |||
| 145 | if (digest != null) { | ||
| 146 | skip = false; | ||
| 147 | digest.reset(); | ||
| 148 | digests.add(digest); | ||
| 149 | manifestHashes.add( | ||
| 150 | decoder.decodeBuffer((String)se.getValue())); | ||
| 151 | } | ||
| 152 | } | ||
| 153 | } | ||
| 154 | } | ||
| 155 | |||
| 156 | /** | ||
| 157 | * update the digests for the digests we are interested in | ||
| 158 | */ | ||
| 159 | public void update(byte buffer) { | ||
| 160 | if (skip) return; | ||
| 161 | |||
| 162 | for (int i=0; i < digests.size(); i++) { | ||
| 163 | digests.get(i).update(buffer); | ||
| 164 | } | ||
| 165 | } | ||
| 166 | |||
| 167 | /** | ||
| 168 | * update the digests for the digests we are interested in | ||
| 169 | */ | ||
| 170 | public void update(byte buffer[], int off, int len) { | ||
| 171 | if (skip) return; | ||
| 172 | |||
| 173 | for (int i=0; i < digests.size(); i++) { | ||
| 174 | digests.get(i).update(buffer, off, len); | ||
| 175 | } | ||
| 176 | } | ||
| 177 | |||
| 178 | /** | ||
| 179 | * get the JarEntry for this object | ||
| 180 | */ | ||
| 181 | public JarEntry getEntry() | ||
| 182 | { | ||
| 183 | return entry; | ||
| 184 | } | ||
| 185 | |||
| 186 | /** | ||
| 187 | * go through all the digests, calculating the final digest | ||
| 188 | * and comparing it to the one in the manifest. If this is | ||
| 189 | * the first time we have verified this object, remove its | ||
| 190 | * code signers from sigFileSigners and place in verifiedSigners. | ||
| 191 | * | ||
| 192 | * | ||
| 193 | */ | ||
| 194 | public CodeSigner[] verify(Hashtable<String, CodeSigner[]> verifiedSigners, | ||
| 195 | Hashtable<String, CodeSigner[]> sigFileSigners) | ||
| 196 | throws JarException | ||
| 197 | { | ||
| 198 | if (skip) { | ||
| 199 | return null; | ||
| 200 | } | ||
| 201 | |||
| 202 | if (signers != null) | ||
| 203 | return signers; | ||
| 204 | |||
| 205 | for (int i=0; i < digests.size(); i++) { | ||
| 206 | |||
| 207 | MessageDigest digest = digests.get(i); | ||
| 208 | byte [] manHash = manifestHashes.get(i); | ||
| 209 | byte [] theHash = digest.digest(); | ||
| 210 | |||
| 211 | if (debug != null) { | ||
| 212 | debug.println("Manifest Entry: " + | ||
| 213 | name + " digest=" + digest.getAlgorithm()); | ||
| 214 | debug.println(" manifest " + toHex(manHash)); | ||
| 215 | debug.println(" computed " + toHex(theHash)); | ||
| 216 | debug.println(); | ||
| 217 | } | ||
| 218 | |||
| 219 | if (!MessageDigest.isEqual(theHash, manHash)) | ||
| 220 | throw new SecurityException(digest.getAlgorithm()+ | ||
| 221 | " digest error for "+name); | ||
| 222 | } | ||
| 223 | |||
| 224 | // take it out of sigFileSigners and put it in verifiedSigners... | ||
| 225 | signers = sigFileSigners.remove(name); | ||
| 226 | if (signers != null) { | ||
| 227 | verifiedSigners.put(name, signers); | ||
| 228 | } | ||
| 229 | return signers; | ||
| 230 | } | ||
| 231 | |||
| 232 | // for the toHex function | ||
| 233 | private static final char[] hexc = | ||
| 234 | {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'}; | ||
| 235 | /** | ||
| 236 | * convert a byte array to a hex string for debugging purposes | ||
| 237 | * @param data the binary data to be converted to a hex string | ||
| 238 | * @return an ASCII hex string | ||
| 239 | */ | ||
| 240 | |||
| 241 | static String toHex(byte[] data) { | ||
| 242 | |||
| 243 | StringBuffer sb = new StringBuffer(data.length*2); | ||
| 244 | |||
| 245 | for (int i=0; i<data.length; i++) { | ||
| 246 | sb.append(hexc[(data[i] >>4) & 0x0f]); | ||
| 247 | sb.append(hexc[data[i] & 0x0f]); | ||
| 248 | } | ||
| 249 | return sb.toString(); | ||
| 250 | } | ||
| 251 | |||
| 252 | } | ||