Karl Pauls | 3640732 | 2008-03-07 00:37:30 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
| 3 | * or more contributor license agreements. See the NOTICE file |
| 4 | * distributed with this work for additional information |
| 5 | * regarding copyright ownership. The ASF licenses this file |
| 6 | * to you under the Apache License, Version 2.0 (the |
| 7 | * "License"); you may not use this file except in compliance |
| 8 | * with the License. You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, |
| 13 | * software distributed under the License is distributed on an |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | * KIND, either express or implied. See the License for the |
| 16 | * specific language governing permissions and limitations |
| 17 | * under the License. |
| 18 | */ |
| 19 | package org.apache.felix.framework.security.verifier; |
| 20 | |
| 21 | import java.io.IOException; |
| 22 | import java.io.InputStream; |
| 23 | import java.lang.reflect.Method; |
| 24 | import java.security.cert.CRL; |
| 25 | import java.security.cert.Certificate; |
| 26 | import java.security.cert.CertificateException; |
| 27 | import java.security.cert.X509Certificate; |
| 28 | import java.util.ArrayList; |
| 29 | import java.util.HashMap; |
| 30 | import java.util.Iterator; |
| 31 | import java.util.List; |
| 32 | import java.util.Map; |
| 33 | import java.util.jar.JarEntry; |
| 34 | import java.util.jar.JarInputStream; |
| 35 | |
| 36 | import org.apache.felix.framework.cache.BundleRevision; |
| 37 | import org.apache.felix.framework.security.util.BundleInputStream; |
| 38 | import org.apache.felix.framework.security.util.TrustManager; |
| 39 | import org.apache.felix.moduleloader.IContent; |
| 40 | import org.apache.felix.moduleloader.IContentLoader; |
| 41 | |
| 42 | public final class BundleDNParser |
| 43 | { |
| 44 | private static final Method m_getCodeSigners; |
| 45 | private static final Method m_getSignerCertPath; |
| 46 | private static final Method m_getCertificates; |
| 47 | |
| 48 | static |
| 49 | { |
| 50 | Method getCodeSigners = null; |
| 51 | Method getSignerCertPath = null; |
| 52 | Method getCertificates = null; |
| 53 | try |
| 54 | { |
| 55 | getCodeSigners = |
| 56 | Class.forName("java.util.jar.JarEntry").getMethod( |
| 57 | "getCodeSigners", null); |
| 58 | getSignerCertPath = |
| 59 | Class.forName("java.security.CodeSigner").getMethod( |
| 60 | "getSignerCertPath", null); |
| 61 | getCertificates = |
| 62 | Class.forName("java.security.cert.CertPath").getMethod( |
| 63 | "getCertificates", null); |
| 64 | } |
| 65 | catch (Exception ex) |
| 66 | { |
| 67 | ex.printStackTrace(); |
| 68 | getCodeSigners = null; |
| 69 | getSignerCertPath = null; |
| 70 | getCertificates = null; |
| 71 | } |
| 72 | m_getCodeSigners = getCodeSigners; |
| 73 | m_getSignerCertPath = getSignerCertPath; |
| 74 | m_getCertificates = getCertificates; |
| 75 | } |
| 76 | |
| 77 | private final Map m_cache = new HashMap(); |
| 78 | private final TrustManager m_manager; |
| 79 | |
| 80 | public BundleDNParser(TrustManager manager) |
| 81 | { |
| 82 | m_manager = manager; |
| 83 | } |
| 84 | |
| 85 | public Map getCache() |
| 86 | { |
| 87 | synchronized (m_cache) |
| 88 | { |
| 89 | return new HashMap(m_cache); |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | public void put(String root, String[] dnChains) |
| 94 | { |
| 95 | synchronized (m_cache) |
| 96 | { |
| 97 | m_cache.put(root, dnChains); |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | public void checkDNChains(String root, IContentLoader contentLoader) throws Exception |
| 102 | { |
| 103 | synchronized (m_cache) |
| 104 | { |
| 105 | if (m_cache.containsKey(root)) |
| 106 | { |
| 107 | String[] result = (String[]) m_cache.get(root); |
| 108 | if ((result != null) && (result.length == 0)) |
| 109 | { |
| 110 | throw new IOException("Bundle not properly signed"); |
| 111 | } |
| 112 | return; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | String[] result = new String[0]; |
| 117 | Exception org = null; |
| 118 | try |
| 119 | { |
| 120 | result = _getDNChains(root, contentLoader.getContent()); |
| 121 | } |
| 122 | catch (Exception ex) |
| 123 | { |
| 124 | org = ex; |
| 125 | } |
| 126 | |
| 127 | synchronized (m_cache) |
| 128 | { |
| 129 | m_cache.put(root, result); |
| 130 | } |
| 131 | |
| 132 | if (org != null) |
| 133 | { |
| 134 | throw org; |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | public String[] getDNChains(String root, BundleRevision bundleRevision) |
| 139 | { |
| 140 | synchronized (m_cache) |
| 141 | { |
| 142 | if (m_cache.containsKey(root)) |
| 143 | { |
| 144 | String[] result = (String[]) m_cache.get(root); |
| 145 | if ((result != null) && (result.length == 0)) |
| 146 | { |
| 147 | return null; |
| 148 | } |
| 149 | return result; |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | String[] result = new String[0]; |
| 154 | |
| 155 | IContent content = null; |
| 156 | try |
| 157 | { |
| 158 | content = bundleRevision.getContent(); |
| 159 | content.open(); |
| 160 | result = _getDNChains(root, content); |
| 161 | } |
| 162 | catch (Exception ex) |
| 163 | { |
| 164 | // Ignore |
| 165 | } |
| 166 | if (content != null) |
| 167 | { |
| 168 | try |
| 169 | { |
| 170 | content.close(); |
| 171 | } |
| 172 | catch (Exception ex) |
| 173 | { |
| 174 | // Ignore |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | synchronized (m_cache) |
| 179 | { |
| 180 | m_cache.put(root, result); |
| 181 | } |
| 182 | |
| 183 | return result; |
| 184 | } |
| 185 | |
| 186 | private String[] _getDNChains(String root, IContent content) |
| 187 | throws IOException |
| 188 | { |
| 189 | X509Certificate[] certificates = null; |
| 190 | |
| 191 | certificates = getCertificates(new BundleInputStream(content)); |
| 192 | |
| 193 | if (certificates == null) |
| 194 | { |
| 195 | return null; |
| 196 | } |
| 197 | |
| 198 | List rootChains = new ArrayList(); |
| 199 | |
| 200 | getRootChains(certificates, rootChains); |
| 201 | |
| 202 | List result = new ArrayList(); |
| 203 | |
| 204 | SubjectDNParser parser = new SubjectDNParser(); |
| 205 | |
| 206 | for (Iterator rootIter = rootChains.iterator(); rootIter.hasNext();) |
| 207 | { |
| 208 | StringBuffer buffer = new StringBuffer(); |
| 209 | |
| 210 | List chain = (List) rootIter.next(); |
| 211 | |
| 212 | Iterator iter = chain.iterator(); |
| 213 | |
| 214 | X509Certificate current = (X509Certificate) iter.next(); |
| 215 | |
| 216 | try |
| 217 | { |
| 218 | buffer.append(parser |
| 219 | .parseSubjectDN(current.getTBSCertificate())); |
| 220 | |
| 221 | while (iter.hasNext()) |
| 222 | { |
| 223 | buffer.append(';'); |
| 224 | |
| 225 | current = (X509Certificate) iter.next(); |
| 226 | |
| 227 | buffer.append(parser.parseSubjectDN(current |
| 228 | .getTBSCertificate())); |
| 229 | } |
| 230 | |
| 231 | result.add(buffer.toString()); |
| 232 | |
| 233 | } |
| 234 | catch (Exception ex) |
| 235 | { |
| 236 | // something went wrong during parsing - |
| 237 | // it might be that the cert contained an unsupported OID |
| 238 | // TODO: log this or something |
| 239 | ex.printStackTrace(); |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | if (!result.isEmpty()) |
| 244 | { |
| 245 | return (String[]) result.toArray(new String[result.size()]); |
| 246 | } |
| 247 | |
| 248 | throw new IOException(); |
| 249 | } |
| 250 | |
| 251 | private X509Certificate[] getCertificates(InputStream input) |
| 252 | throws IOException |
| 253 | { |
| 254 | JarInputStream bundle = new JarInputStream(input, true); |
| 255 | |
| 256 | if (bundle.getManifest() == null) |
| 257 | { |
| 258 | return null; |
| 259 | } |
| 260 | |
| 261 | List certificateChains = new ArrayList(); |
| 262 | |
| 263 | int count = certificateChains.size(); |
| 264 | |
| 265 | // This is tricky: jdk1.3 doesn't say anything about what is happening |
| 266 | // if a bad sig is detected on an entry - later jdk's do say that they |
| 267 | // will throw a security Exception. The below should cater for both |
| 268 | // behaviors. |
| 269 | for (JarEntry entry = bundle.getNextJarEntry(); entry != null; entry = |
| 270 | bundle.getNextJarEntry()) |
| 271 | { |
| 272 | |
| 273 | if (entry.isDirectory() || entry.getName().startsWith("META-INF")) |
| 274 | { |
| 275 | continue; |
| 276 | } |
| 277 | |
| 278 | for (byte[] tmp = new byte[4096]; bundle.read(tmp, 0, tmp.length) != -1;) |
| 279 | { |
| 280 | } |
| 281 | |
| 282 | Certificate[] certificates = entry.getCertificates(); |
| 283 | |
| 284 | // Workaround stupid bug in the sun jdk 1.5.x - getCertificates() |
| 285 | // returns null there even if there are valid certificates. |
| 286 | // This is a regression bug that has been fixed in 1.6. |
| 287 | // |
| 288 | // We use reflection to see whether we have a SignerCertPath |
| 289 | // for the entry (available >= 1.5) and if so check whether |
| 290 | // there are valid certificates - don't try this at home. |
| 291 | if ((certificates == null) && (m_getCodeSigners != null)) |
| 292 | { |
| 293 | try |
| 294 | { |
| 295 | Object[] signers = |
| 296 | (Object[]) m_getCodeSigners.invoke(entry, null); |
| 297 | |
| 298 | if (signers != null) |
| 299 | { |
| 300 | List certChains = new ArrayList(); |
| 301 | |
| 302 | for (int i = 0; i < signers.length; i++) |
| 303 | { |
| 304 | Object path = |
| 305 | m_getSignerCertPath.invoke(signers[i], null); |
| 306 | |
| 307 | certChains.addAll((List) m_getCertificates.invoke( |
| 308 | path, null)); |
| 309 | } |
| 310 | |
| 311 | certificates = |
| 312 | (Certificate[]) certChains |
| 313 | .toArray(new Certificate[certChains.size()]); |
| 314 | } |
| 315 | } |
| 316 | catch (Exception ex) |
| 317 | { |
| 318 | ex.printStackTrace(); |
| 319 | // Not much we can do - probably we are not on >= 1.5 |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | if ((certificates == null) || (certificates.length == 0)) |
| 324 | { |
| 325 | return null; |
| 326 | } |
| 327 | |
| 328 | List chains = new ArrayList(); |
| 329 | |
| 330 | getRootChains(certificates, chains); |
| 331 | |
| 332 | if (certificateChains.isEmpty()) |
| 333 | { |
| 334 | certificateChains.addAll(chains); |
| 335 | count = certificateChains.size(); |
| 336 | } |
| 337 | else |
| 338 | { |
| 339 | for (Iterator iter2 = certificateChains.iterator(); iter2 |
| 340 | .hasNext();) |
| 341 | { |
| 342 | X509Certificate cert = |
| 343 | (X509Certificate) ((List) iter2.next()).get(0); |
| 344 | boolean found = false; |
| 345 | for (Iterator iter3 = chains.iterator(); iter3.hasNext();) |
| 346 | { |
| 347 | X509Certificate cert2 = |
| 348 | (X509Certificate) ((List) iter3.next()).get(0); |
| 349 | |
| 350 | if (cert.getSubjectDN().equals(cert2.getSubjectDN()) |
| 351 | && cert.equals(cert2)) |
| 352 | { |
| 353 | found = true; |
| 354 | break; |
| 355 | } |
| 356 | } |
| 357 | if (!found) |
| 358 | { |
| 359 | iter2.remove(); |
| 360 | } |
| 361 | } |
| 362 | } |
| 363 | |
| 364 | if (certificateChains.isEmpty()) |
| 365 | { |
| 366 | if (count > 0) |
| 367 | { |
| 368 | throw new IOException("Bad signers"); |
| 369 | } |
| 370 | return null; |
| 371 | } |
| 372 | } |
| 373 | |
| 374 | List result = new ArrayList(); |
| 375 | |
| 376 | for (Iterator iter = certificateChains.iterator(); iter.hasNext();) |
| 377 | { |
| 378 | result.addAll((List) iter.next()); |
| 379 | } |
| 380 | |
| 381 | return (X509Certificate[]) result.toArray(new X509Certificate[result |
| 382 | .size()]); |
| 383 | } |
| 384 | |
| 385 | private boolean isRevoked(Certificate certificate) |
| 386 | { |
| 387 | for (Iterator iter = m_manager.getCRLs().iterator(); iter.hasNext();) |
| 388 | { |
| 389 | if (((CRL) iter.next()).isRevoked(certificate)) |
| 390 | { |
| 391 | return true; |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | return false; |
| 396 | } |
| 397 | |
| 398 | private void getRootChains(Certificate[] certificates, List chains) |
| 399 | { |
| 400 | List chain = new ArrayList(); |
| 401 | |
| 402 | boolean revoked = false; |
| 403 | |
| 404 | for (int i = 0; i < certificates.length - 1; i++) |
| 405 | { |
| 406 | X509Certificate certificate = (X509Certificate) certificates[i]; |
| 407 | |
| 408 | if (!revoked && isRevoked(certificate)) |
| 409 | { |
| 410 | revoked = true; |
| 411 | } |
| 412 | else if (!revoked) |
| 413 | { |
| 414 | try |
| 415 | { |
| 416 | certificate.checkValidity(); |
| 417 | |
| 418 | chain.add(certificate); |
| 419 | } |
| 420 | catch (CertificateException ex) |
| 421 | { |
| 422 | // TODO: log this or something |
| 423 | revoked = true; |
| 424 | } |
| 425 | } |
| 426 | |
| 427 | if (!((X509Certificate) certificates[i + 1]).getSubjectDN().equals( |
| 428 | certificate.getIssuerDN())) |
| 429 | { |
| 430 | if (!revoked && trusted(certificate)) |
| 431 | { |
| 432 | chains.add(chain); |
| 433 | } |
| 434 | |
| 435 | revoked = false; |
| 436 | |
| 437 | if (!chain.isEmpty()) |
| 438 | { |
| 439 | chain = new ArrayList(); |
| 440 | } |
| 441 | } |
| 442 | } |
| 443 | // The final entry in the certs array is always |
| 444 | // a "root" certificate |
| 445 | if (!revoked) |
| 446 | { |
| 447 | chain.add(certificates[certificates.length - 1]); |
| 448 | if (trusted((X509Certificate) certificates[certificates.length - 1])) |
| 449 | { |
| 450 | chains.add(chain); |
| 451 | } |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | private boolean trusted(X509Certificate cert) |
| 456 | { |
| 457 | if (m_manager.getCaCerts().isEmpty() || isRevoked(cert)) |
| 458 | { |
| 459 | return false; |
| 460 | } |
| 461 | |
| 462 | for (Iterator iter = m_manager.getCaCerts().iterator(); iter.hasNext();) |
| 463 | { |
| 464 | X509Certificate trustedCaCert = (X509Certificate) iter.next(); |
| 465 | |
| 466 | if (isRevoked(trustedCaCert)) |
| 467 | { |
| 468 | continue; |
| 469 | } |
| 470 | |
| 471 | // If the cert has the same SubjectDN |
| 472 | // as a trusted CA, check whether |
| 473 | // the two certs are the same. |
| 474 | if (cert.getSubjectDN().equals(trustedCaCert.getSubjectDN())) |
| 475 | { |
| 476 | if (cert.equals(trustedCaCert)) |
| 477 | { |
| 478 | try |
| 479 | { |
| 480 | cert.checkValidity(); |
| 481 | trustedCaCert.checkValidity(); |
| 482 | return true; |
| 483 | } |
| 484 | catch (CertificateException ex) |
| 485 | { |
| 486 | // Not much we can do |
| 487 | // TODO: log this or something |
| 488 | } |
| 489 | } |
| 490 | } |
| 491 | } |
| 492 | |
| 493 | // cert issued by any of m_trustedCaCerts ? return true : return false |
| 494 | for (Iterator iter = m_manager.getCaCerts().iterator(); iter.hasNext();) |
| 495 | { |
| 496 | X509Certificate trustedCaCert = (X509Certificate) iter.next(); |
| 497 | |
| 498 | if (isRevoked(trustedCaCert)) |
| 499 | { |
| 500 | continue; |
| 501 | } |
| 502 | |
| 503 | if (cert.getIssuerDN().equals(trustedCaCert.getSubjectDN())) |
| 504 | { |
| 505 | try |
| 506 | { |
| 507 | cert.verify(trustedCaCert.getPublicKey()); |
| 508 | cert.checkValidity(); |
| 509 | trustedCaCert.checkValidity(); |
| 510 | return true; |
| 511 | } |
| 512 | catch (Exception ex) |
| 513 | { |
| 514 | // TODO: log this or something |
| 515 | } |
| 516 | } |
| 517 | } |
| 518 | |
| 519 | return false; |
| 520 | } |
| 521 | } |