1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.signapk; 18 19 import org.bouncycastle.asn1.ASN1InputStream; 20 import org.bouncycastle.asn1.ASN1ObjectIdentifier; 21 import org.bouncycastle.asn1.DEROutputStream; 22 import org.bouncycastle.asn1.cms.CMSObjectIdentifiers; 23 import org.bouncycastle.asn1.pkcs.PrivateKeyInfo; 24 import org.bouncycastle.cert.jcajce.JcaCertStore; 25 import org.bouncycastle.cms.CMSException; 26 import org.bouncycastle.cms.CMSProcessableByteArray; 27 import org.bouncycastle.cms.CMSSignedData; 28 import org.bouncycastle.cms.CMSSignedDataGenerator; 29 import org.bouncycastle.cms.CMSTypedData; 30 import org.bouncycastle.cms.jcajce.JcaSignerInfoGeneratorBuilder; 31 import org.bouncycastle.jce.provider.BouncyCastleProvider; 32 import org.bouncycastle.operator.ContentSigner; 33 import org.bouncycastle.operator.OperatorCreationException; 34 import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder; 35 import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder; 36 import org.bouncycastle.util.encoders.Base64; 37 38 import java.io.BufferedReader; 39 import java.io.ByteArrayInputStream; 40 import java.io.ByteArrayOutputStream; 41 import java.io.DataInputStream; 42 import java.io.File; 43 import java.io.FileInputStream; 44 import java.io.FileOutputStream; 45 import java.io.FilterOutputStream; 46 import java.io.IOException; 47 import java.io.InputStream; 48 import java.io.InputStreamReader; 49 import java.io.OutputStream; 50 import java.io.PrintStream; 51 import java.lang.reflect.Constructor; 52 import java.security.DigestOutputStream; 53 import java.security.GeneralSecurityException; 54 import java.security.Key; 55 import java.security.KeyFactory; 56 import java.security.MessageDigest; 57 import java.security.PrivateKey; 58 import java.security.Provider; 59 import java.security.Security; 60 import java.security.cert.CertificateEncodingException; 61 import java.security.cert.CertificateFactory; 62 import java.security.cert.X509Certificate; 63 import java.security.spec.InvalidKeySpecException; 64 import java.security.spec.PKCS8EncodedKeySpec; 65 import java.util.ArrayList; 66 import java.util.Collections; 67 import java.util.Enumeration; 68 import java.util.Locale; 69 import java.util.Map; 70 import java.util.TreeMap; 71 import java.util.jar.Attributes; 72 import java.util.jar.JarEntry; 73 import java.util.jar.JarFile; 74 import java.util.jar.JarOutputStream; 75 import java.util.jar.Manifest; 76 import java.util.regex.Pattern; 77 import javax.crypto.Cipher; 78 import javax.crypto.EncryptedPrivateKeyInfo; 79 import javax.crypto.SecretKeyFactory; 80 import javax.crypto.spec.PBEKeySpec; 81 82 /** 83 * HISTORICAL NOTE: 84 * 85 * Prior to the keylimepie release, SignApk ignored the signature 86 * algorithm specified in the certificate and always used SHA1withRSA. 87 * 88 * Starting with JB-MR2, the platform supports SHA256withRSA, so we use 89 * the signature algorithm in the certificate to select which to use 90 * (SHA256withRSA or SHA1withRSA). Also in JB-MR2, EC keys are supported. 91 * 92 * Because there are old keys still in use whose certificate actually 93 * says "MD5withRSA", we treat these as though they say "SHA1withRSA" 94 * for compatibility with older releases. This can be changed by 95 * altering the getAlgorithm() function below. 96 */ 97 98 99 /** 100 * Command line tool to sign JAR files (including APKs and OTA updates) in a way 101 * compatible with the mincrypt verifier, using EC or RSA keys and SHA1 or 102 * SHA-256 (see historical note). 103 */ 104 class SignApk { 105 private static final String CERT_SF_NAME = "META-INF/CERT.SF"; 106 private static final String CERT_SIG_NAME = "META-INF/CERT.%s"; 107 private static final String CERT_SF_MULTI_NAME = "META-INF/CERT%d.SF"; 108 private static final String CERT_SIG_MULTI_NAME = "META-INF/CERT%d.%s"; 109 110 private static final String OTACERT_NAME = "META-INF/com/android/otacert"; 111 112 private static Provider sBouncyCastleProvider; 113 114 // bitmasks for which hash algorithms we need the manifest to include. 115 private static final int USE_SHA1 = 1; 116 private static final int USE_SHA256 = 2; 117 118 /** 119 * Return one of USE_SHA1 or USE_SHA256 according to the signature 120 * algorithm specified in the cert. 121 */ 122 private static int getDigestAlgorithm(X509Certificate cert) { 123 String sigAlg = cert.getSigAlgName().toUpperCase(Locale.US); 124 if ("SHA1WITHRSA".equals(sigAlg) || 125 "MD5WITHRSA".equals(sigAlg)) { // see "HISTORICAL NOTE" above. 126 return USE_SHA1; 127 } else if (sigAlg.startsWith("SHA256WITH")) { 128 return USE_SHA256; 129 } else { 130 throw new IllegalArgumentException("unsupported signature algorithm \"" + sigAlg + 131 "\" in cert [" + cert.getSubjectDN()); 132 } 133 } 134 135 /** Returns the expected signature algorithm for this key type. */ 136 private static String getSignatureAlgorithm(X509Certificate cert) { 137 String sigAlg = cert.getSigAlgName().toUpperCase(Locale.US); 138 String keyType = cert.getPublicKey().getAlgorithm().toUpperCase(Locale.US); 139 if ("RSA".equalsIgnoreCase(keyType)) { 140 if (getDigestAlgorithm(cert) == USE_SHA256) { 141 return "SHA256withRSA"; 142 } else { 143 return "SHA1withRSA"; 144 } 145 } else if ("EC".equalsIgnoreCase(keyType)) { 146 return "SHA256withECDSA"; 147 } else { 148 throw new IllegalArgumentException("unsupported key type: " + keyType); 149 } 150 } 151 152 // Files matching this pattern are not copied to the output. 153 private static Pattern stripPattern = 154 Pattern.compile("^(META-INF/((.*)[.](SF|RSA|DSA|EC)|com/android/otacert))|(" + 155 Pattern.quote(JarFile.MANIFEST_NAME) + ")$"); 156 157 private static X509Certificate readPublicKey(File file) 158 throws IOException, GeneralSecurityException { 159 FileInputStream input = new FileInputStream(file); 160 try { 161 CertificateFactory cf = CertificateFactory.getInstance("X.509"); 162 return (X509Certificate) cf.generateCertificate(input); 163 } finally { 164 input.close(); 165 } 166 } 167 168 /** 169 * Reads the password from stdin and returns it as a string. 170 * 171 * @param keyFile The file containing the private key. Used to prompt the user. 172 */ 173 private static String readPassword(File keyFile) { 174 // TODO: use Console.readPassword() when it's available. 175 System.out.print("Enter password for " + keyFile + " (password will not be hidden): "); 176 System.out.flush(); 177 BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in)); 178 try { 179 return stdin.readLine(); 180 } catch (IOException ex) { 181 return null; 182 } 183 } 184 185 /** 186 * Decrypt an encrypted PKCS#8 format private key. 187 * 188 * Based on ghstark's post on Aug 6, 2006 at 189 * http://forums.sun.com/thread.jspa?threadID=758133&messageID=4330949 190 * 191 * @param encryptedPrivateKey The raw data of the private key 192 * @param keyFile The file containing the private key 193 */ 194 private static PKCS8EncodedKeySpec decryptPrivateKey(byte[] encryptedPrivateKey, File keyFile) 195 throws GeneralSecurityException { 196 EncryptedPrivateKeyInfo epkInfo; 197 try { 198 epkInfo = new EncryptedPrivateKeyInfo(encryptedPrivateKey); 199 } catch (IOException ex) { 200 // Probably not an encrypted key. 201 return null; 202 } 203 204 char[] password = readPassword(keyFile).toCharArray(); 205 206 SecretKeyFactory skFactory = SecretKeyFactory.getInstance(epkInfo.getAlgName()); 207 Key key = skFactory.generateSecret(new PBEKeySpec(password)); 208 209 Cipher cipher = Cipher.getInstance(epkInfo.getAlgName()); 210 cipher.init(Cipher.DECRYPT_MODE, key, epkInfo.getAlgParameters()); 211 212 try { 213 return epkInfo.getKeySpec(cipher); 214 } catch (InvalidKeySpecException ex) { 215 System.err.println("signapk: Password for " + keyFile + " may be bad."); 216 throw ex; 217 } 218 } 219 220 /** Read a PKCS#8 format private key. */ 221 private static PrivateKey readPrivateKey(File file) 222 throws IOException, GeneralSecurityException { 223 DataInputStream input = new DataInputStream(new FileInputStream(file)); 224 try { 225 byte[] bytes = new byte[(int) file.length()]; 226 input.read(bytes); 227 228 /* Check to see if this is in an EncryptedPrivateKeyInfo structure. */ 229 PKCS8EncodedKeySpec spec = decryptPrivateKey(bytes, file); 230 if (spec == null) { 231 spec = new PKCS8EncodedKeySpec(bytes); 232 } 233 234 /* 235 * Now it's in a PKCS#8 PrivateKeyInfo structure. Read its Algorithm 236 * OID and use that to construct a KeyFactory. 237 */ 238 ASN1InputStream bIn = new ASN1InputStream(new ByteArrayInputStream(spec.getEncoded())); 239 PrivateKeyInfo pki = PrivateKeyInfo.getInstance(bIn.readObject()); 240 String algOid = pki.getPrivateKeyAlgorithm().getAlgorithm().getId(); 241 242 return KeyFactory.getInstance(algOid).generatePrivate(spec); 243 } finally { 244 input.close(); 245 } 246 } 247 248 /** 249 * Add the hash(es) of every file to the manifest, creating it if 250 * necessary. 251 */ 252 private static Manifest addDigestsToManifest(JarFile jar, int hashes) 253 throws IOException, GeneralSecurityException { 254 Manifest input = jar.getManifest(); 255 Manifest output = new Manifest(); 256 Attributes main = output.getMainAttributes(); 257 if (input != null) { 258 main.putAll(input.getMainAttributes()); 259 } else { 260 main.putValue("Manifest-Version", "1.0"); 261 main.putValue("Created-By", "1.0 (Android SignApk)"); 262 } 263 264 MessageDigest md_sha1 = null; 265 MessageDigest md_sha256 = null; 266 if ((hashes & USE_SHA1) != 0) { 267 md_sha1 = MessageDigest.getInstance("SHA1"); 268 } 269 if ((hashes & USE_SHA256) != 0) { 270 md_sha256 = MessageDigest.getInstance("SHA256"); 271 } 272 273 byte[] buffer = new byte[4096]; 274 int num; 275 276 // We sort the input entries by name, and add them to the 277 // output manifest in sorted order. We expect that the output 278 // map will be deterministic. 279 280 TreeMap<String, JarEntry> byName = new TreeMap<String, JarEntry>(); 281 282 for (Enumeration<JarEntry> e = jar.entries(); e.hasMoreElements(); ) { 283 JarEntry entry = e.nextElement(); 284 byName.put(entry.getName(), entry); 285 } 286 287 for (JarEntry entry: byName.values()) { 288 String name = entry.getName(); 289 if (!entry.isDirectory() && 290 (stripPattern == null || !stripPattern.matcher(name).matches())) { 291 InputStream data = jar.getInputStream(entry); 292 while ((num = data.read(buffer)) > 0) { 293 if (md_sha1 != null) md_sha1.update(buffer, 0, num); 294 if (md_sha256 != null) md_sha256.update(buffer, 0, num); 295 } 296 297 Attributes attr = null; 298 if (input != null) attr = input.getAttributes(name); 299 attr = attr != null ? new Attributes(attr) : new Attributes(); 300 if (md_sha1 != null) { 301 attr.putValue("SHA1-Digest", 302 new String(Base64.encode(md_sha1.digest()), "ASCII")); 303 } 304 if (md_sha256 != null) { 305 attr.putValue("SHA-256-Digest", 306 new String(Base64.encode(md_sha256.digest()), "ASCII")); 307 } 308 output.getEntries().put(name, attr); 309 } 310 } 311 312 return output; 313 } 314 315 /** 316 * Add a copy of the public key to the archive; this should 317 * exactly match one of the files in 318 * /system/etc/security/otacerts.zip on the device. (The same 319 * cert can be extracted from the CERT.RSA file but this is much 320 * easier to get at.) 321 */ 322 private static void addOtacert(JarOutputStream outputJar, 323 File publicKeyFile, 324 long timestamp, 325 Manifest manifest, 326 int hash) 327 throws IOException, GeneralSecurityException { 328 MessageDigest md = MessageDigest.getInstance(hash == USE_SHA1 ? "SHA1" : "SHA256"); 329 330 JarEntry je = new JarEntry(OTACERT_NAME); 331 je.setTime(timestamp); 332 outputJar.putNextEntry(je); 333 FileInputStream input = new FileInputStream(publicKeyFile); 334 byte[] b = new byte[4096]; 335 int read; 336 while ((read = input.read(b)) != -1) { 337 outputJar.write(b, 0, read); 338 md.update(b, 0, read); 339 } 340 input.close(); 341 342 Attributes attr = new Attributes(); 343 attr.putValue(hash == USE_SHA1 ? "SHA1-Digest" : "SHA-256-Digest", 344 new String(Base64.encode(md.digest()), "ASCII")); 345 manifest.getEntries().put(OTACERT_NAME, attr); 346 } 347 348 349 /** Write to another stream and track how many bytes have been 350 * written. 351 */ 352 private static class CountOutputStream extends FilterOutputStream { 353 private int mCount; 354 355 public CountOutputStream(OutputStream out) { 356 super(out); 357 mCount = 0; 358 } 359 360 @Override 361 public void write(int b) throws IOException { 362 super.write(b); 363 mCount++; 364 } 365 366 @Override 367 public void write(byte[] b, int off, int len) throws IOException { 368 super.write(b, off, len); 369 mCount += len; 370 } 371 372 public int size() { 373 return mCount; 374 } 375 } 376 377 /** Write a .SF file with a digest of the specified manifest. */ 378 private static void writeSignatureFile(Manifest manifest, OutputStream out, 379 int hash) 380 throws IOException, GeneralSecurityException { 381 Manifest sf = new Manifest(); 382 Attributes main = sf.getMainAttributes(); 383 main.putValue("Signature-Version", "1.0"); 384 main.putValue("Created-By", "1.0 (Android SignApk)"); 385 386 MessageDigest md = MessageDigest.getInstance( 387 hash == USE_SHA256 ? "SHA256" : "SHA1"); 388 PrintStream print = new PrintStream( 389 new DigestOutputStream(new ByteArrayOutputStream(), md), 390 true, "UTF-8"); 391 392 // Digest of the entire manifest 393 manifest.write(print); 394 print.flush(); 395 main.putValue(hash == USE_SHA256 ? "SHA-256-Digest-Manifest" : "SHA1-Digest-Manifest", 396 new String(Base64.encode(md.digest()), "ASCII")); 397 398 Map<String, Attributes> entries = manifest.getEntries(); 399 for (Map.Entry<String, Attributes> entry : entries.entrySet()) { 400 // Digest of the manifest stanza for this entry. 401 print.print("Name: " + entry.getKey() + "\r\n"); 402 for (Map.Entry<Object, Object> att : entry.getValue().entrySet()) { 403 print.print(att.getKey() + ": " + att.getValue() + "\r\n"); 404 } 405 print.print("\r\n"); 406 print.flush(); 407 408 Attributes sfAttr = new Attributes(); 409 sfAttr.putValue(hash == USE_SHA256 ? "SHA-256-Digest" : "SHA1-Digest-Manifest", 410 new String(Base64.encode(md.digest()), "ASCII")); 411 sf.getEntries().put(entry.getKey(), sfAttr); 412 } 413 414 CountOutputStream cout = new CountOutputStream(out); 415 sf.write(cout); 416 417 // A bug in the java.util.jar implementation of Android platforms 418 // up to version 1.6 will cause a spurious IOException to be thrown 419 // if the length of the signature file is a multiple of 1024 bytes. 420 // As a workaround, add an extra CRLF in this case. 421 if ((cout.size() % 1024) == 0) { 422 cout.write('\r'); 423 cout.write('\n'); 424 } 425 } 426 427 /** Sign data and write the digital signature to 'out'. */ 428 private static void writeSignatureBlock( 429 CMSTypedData data, X509Certificate publicKey, PrivateKey privateKey, 430 OutputStream out) 431 throws IOException, 432 CertificateEncodingException, 433 OperatorCreationException, 434 CMSException { 435 ArrayList<X509Certificate> certList = new ArrayList<X509Certificate>(1); 436 certList.add(publicKey); 437 JcaCertStore certs = new JcaCertStore(certList); 438 439 CMSSignedDataGenerator gen = new CMSSignedDataGenerator(); 440 ContentSigner signer = new JcaContentSignerBuilder(getSignatureAlgorithm(publicKey)) 441 .setProvider(sBouncyCastleProvider) 442 .build(privateKey); 443 gen.addSignerInfoGenerator( 444 new JcaSignerInfoGeneratorBuilder( 445 new JcaDigestCalculatorProviderBuilder() 446 .setProvider(sBouncyCastleProvider) 447 .build()) 448 .setDirectSignature(true) 449 .build(signer, publicKey)); 450 gen.addCertificates(certs); 451 CMSSignedData sigData = gen.generate(data, false); 452 453 ASN1InputStream asn1 = new ASN1InputStream(sigData.getEncoded()); 454 DEROutputStream dos = new DEROutputStream(out); 455 dos.writeObject(asn1.readObject()); 456 } 457 458 /** 459 * Copy all the files in a manifest from input to output. We set 460 * the modification times in the output to a fixed time, so as to 461 * reduce variation in the output file and make incremental OTAs 462 * more efficient. 463 */ 464 private static void copyFiles(Manifest manifest, JarFile in, JarOutputStream out, 465 long timestamp, int alignment) throws IOException { 466 byte[] buffer = new byte[4096]; 467 int num; 468 469 Map<String, Attributes> entries = manifest.getEntries(); 470 ArrayList<String> names = new ArrayList<String>(entries.keySet()); 471 Collections.sort(names); 472 473 boolean firstEntry = true; 474 long offset = 0L; 475 476 // We do the copy in two passes -- first copying all the 477 // entries that are STORED, then copying all the entries that 478 // have any other compression flag (which in practice means 479 // DEFLATED). This groups all the stored entries together at 480 // the start of the file and makes it easier to do alignment 481 // on them (since only stored entries are aligned). 482 483 for (String name : names) { 484 JarEntry inEntry = in.getJarEntry(name); 485 JarEntry outEntry = null; 486 if (inEntry.getMethod() != JarEntry.STORED) continue; 487 // Preserve the STORED method of the input entry. 488 outEntry = new JarEntry(inEntry); 489 outEntry.setTime(timestamp); 490 491 // 'offset' is the offset into the file at which we expect 492 // the file data to begin. This is the value we need to 493 // make a multiple of 'alignement'. 494 offset += JarFile.LOCHDR + outEntry.getName().length(); 495 if (firstEntry) { 496 // The first entry in a jar file has an extra field of 497 // four bytes that you can't get rid of; any extra 498 // data you specify in the JarEntry is appended to 499 // these forced four bytes. This is JAR_MAGIC in 500 // JarOutputStream; the bytes are 0xfeca0000. 501 offset += 4; 502 firstEntry = false; 503 } 504 if (alignment > 0 && (offset % alignment != 0)) { 505 // Set the "extra data" of the entry to between 1 and 506 // alignment-1 bytes, to make the file data begin at 507 // an aligned offset. 508 int needed = alignment - (int)(offset % alignment); 509 outEntry.setExtra(new byte[needed]); 510 offset += needed; 511 } 512 513 out.putNextEntry(outEntry); 514 515 InputStream data = in.getInputStream(inEntry); 516 while ((num = data.read(buffer)) > 0) { 517 out.write(buffer, 0, num); 518 offset += num; 519 } 520 out.flush(); 521 } 522 523 // Copy all the non-STORED entries. We don't attempt to 524 // maintain the 'offset' variable past this point; we don't do 525 // alignment on these entries. 526 527 for (String name : names) { 528 JarEntry inEntry = in.getJarEntry(name); 529 JarEntry outEntry = null; 530 if (inEntry.getMethod() == JarEntry.STORED) continue; 531 // Create a new entry so that the compressed len is recomputed. 532 outEntry = new JarEntry(name); 533 outEntry.setTime(timestamp); 534 out.putNextEntry(outEntry); 535 536 InputStream data = in.getInputStream(inEntry); 537 while ((num = data.read(buffer)) > 0) { 538 out.write(buffer, 0, num); 539 } 540 out.flush(); 541 } 542 } 543 544 private static class WholeFileSignerOutputStream extends FilterOutputStream { 545 private boolean closing = false; 546 private ByteArrayOutputStream footer = new ByteArrayOutputStream(); 547 private OutputStream tee; 548 549 public WholeFileSignerOutputStream(OutputStream out, OutputStream tee) { 550 super(out); 551 this.tee = tee; 552 } 553 554 public void notifyClosing() { 555 closing = true; 556 } 557 558 public void finish() throws IOException { 559 closing = false; 560 561 byte[] data = footer.toByteArray(); 562 if (data.length < 2) 563 throw new IOException("Less than two bytes written to footer"); 564 write(data, 0, data.length - 2); 565 } 566 567 public byte[] getTail() { 568 return footer.toByteArray(); 569 } 570 571 @Override 572 public void write(byte[] b) throws IOException { 573 write(b, 0, b.length); 574 } 575 576 @Override 577 public void write(byte[] b, int off, int len) throws IOException { 578 if (closing) { 579 // if the jar is about to close, save the footer that will be written 580 footer.write(b, off, len); 581 } 582 else { 583 // write to both output streams. out is the CMSTypedData signer and tee is the file. 584 out.write(b, off, len); 585 tee.write(b, off, len); 586 } 587 } 588 589 @Override 590 public void write(int b) throws IOException { 591 if (closing) { 592 // if the jar is about to close, save the footer that will be written 593 footer.write(b); 594 } 595 else { 596 // write to both output streams. out is the CMSTypedData signer and tee is the file. 597 out.write(b); 598 tee.write(b); 599 } 600 } 601 } 602 603 private static class CMSSigner implements CMSTypedData { 604 private JarFile inputJar; 605 private File publicKeyFile; 606 private X509Certificate publicKey; 607 private PrivateKey privateKey; 608 private String outputFile; 609 private OutputStream outputStream; 610 private final ASN1ObjectIdentifier type; 611 private WholeFileSignerOutputStream signer; 612 613 public CMSSigner(JarFile inputJar, File publicKeyFile, 614 X509Certificate publicKey, PrivateKey privateKey, 615 OutputStream outputStream) { 616 this.inputJar = inputJar; 617 this.publicKeyFile = publicKeyFile; 618 this.publicKey = publicKey; 619 this.privateKey = privateKey; 620 this.outputStream = outputStream; 621 this.type = new ASN1ObjectIdentifier(CMSObjectIdentifiers.data.getId()); 622 } 623 624 public Object getContent() { 625 throw new UnsupportedOperationException(); 626 } 627 628 public ASN1ObjectIdentifier getContentType() { 629 return type; 630 } 631 632 public void write(OutputStream out) throws IOException { 633 try { 634 signer = new WholeFileSignerOutputStream(out, outputStream); 635 JarOutputStream outputJar = new JarOutputStream(signer); 636 637 int hash = getDigestAlgorithm(publicKey); 638 639 // Assume the certificate is valid for at least an hour. 640 long timestamp = publicKey.getNotBefore().getTime() + 3600L * 1000; 641 642 Manifest manifest = addDigestsToManifest(inputJar, hash); 643 copyFiles(manifest, inputJar, outputJar, timestamp, 0); 644 addOtacert(outputJar, publicKeyFile, timestamp, manifest, hash); 645 646 signFile(manifest, inputJar, 647 new X509Certificate[]{ publicKey }, 648 new PrivateKey[]{ privateKey }, 649 outputJar); 650 651 signer.notifyClosing(); 652 outputJar.close(); 653 signer.finish(); 654 } 655 catch (Exception e) { 656 throw new IOException(e); 657 } 658 } 659 660 public void writeSignatureBlock(ByteArrayOutputStream temp) 661 throws IOException, 662 CertificateEncodingException, 663 OperatorCreationException, 664 CMSException { 665 SignApk.writeSignatureBlock(this, publicKey, privateKey, temp); 666 } 667 668 public WholeFileSignerOutputStream getSigner() { 669 return signer; 670 } 671 } 672 673 private static void signWholeFile(JarFile inputJar, File publicKeyFile, 674 X509Certificate publicKey, PrivateKey privateKey, 675 OutputStream outputStream) throws Exception { 676 CMSSigner cmsOut = new CMSSigner(inputJar, publicKeyFile, 677 publicKey, privateKey, outputStream); 678 679 ByteArrayOutputStream temp = new ByteArrayOutputStream(); 680 681 // put a readable message and a null char at the start of the 682 // archive comment, so that tools that display the comment 683 // (hopefully) show something sensible. 684 // TODO: anything more useful we can put in this message? 685 byte[] message = "signed by SignApk".getBytes("UTF-8"); 686 temp.write(message); 687 temp.write(0); 688 689 cmsOut.writeSignatureBlock(temp); 690 691 byte[] zipData = cmsOut.getSigner().getTail(); 692 693 // For a zip with no archive comment, the 694 // end-of-central-directory record will be 22 bytes long, so 695 // we expect to find the EOCD marker 22 bytes from the end. 696 if (zipData[zipData.length-22] != 0x50 || 697 zipData[zipData.length-21] != 0x4b || 698 zipData[zipData.length-20] != 0x05 || 699 zipData[zipData.length-19] != 0x06) { 700 throw new IllegalArgumentException("zip data already has an archive comment"); 701 } 702 703 int total_size = temp.size() + 6; 704 if (total_size > 0xffff) { 705 throw new IllegalArgumentException("signature is too big for ZIP file comment"); 706 } 707 // signature starts this many bytes from the end of the file 708 int signature_start = total_size - message.length - 1; 709 temp.write(signature_start & 0xff); 710 temp.write((signature_start >> 8) & 0xff); 711 // Why the 0xff bytes? In a zip file with no archive comment, 712 // bytes [-6:-2] of the file are the little-endian offset from 713 // the start of the file to the central directory. So for the 714 // two high bytes to be 0xff 0xff, the archive would have to 715 // be nearly 4GB in size. So it's unlikely that a real 716 // commentless archive would have 0xffs here, and lets us tell 717 // an old signed archive from a new one. 718 temp.write(0xff); 719 temp.write(0xff); 720 temp.write(total_size & 0xff); 721 temp.write((total_size >> 8) & 0xff); 722 temp.flush(); 723 724 // Signature verification checks that the EOCD header is the 725 // last such sequence in the file (to avoid minzip finding a 726 // fake EOCD appended after the signature in its scan). The 727 // odds of producing this sequence by chance are very low, but 728 // let's catch it here if it does. 729 byte[] b = temp.toByteArray(); 730 for (int i = 0; i < b.length-3; ++i) { 731 if (b[i] == 0x50 && b[i+1] == 0x4b && b[i+2] == 0x05 && b[i+3] == 0x06) { 732 throw new IllegalArgumentException("found spurious EOCD header at " + i); 733 } 734 } 735 736 outputStream.write(total_size & 0xff); 737 outputStream.write((total_size >> 8) & 0xff); 738 temp.writeTo(outputStream); 739 } 740 741 private static void signFile(Manifest manifest, JarFile inputJar, 742 X509Certificate[] publicKey, PrivateKey[] privateKey, 743 JarOutputStream outputJar) 744 throws Exception { 745 // Assume the certificate is valid for at least an hour. 746 long timestamp = publicKey[0].getNotBefore().getTime() + 3600L * 1000; 747 748 // MANIFEST.MF 749 JarEntry je = new JarEntry(JarFile.MANIFEST_NAME); 750 je.setTime(timestamp); 751 outputJar.putNextEntry(je); 752 manifest.write(outputJar); 753 754 int numKeys = publicKey.length; 755 for (int k = 0; k < numKeys; ++k) { 756 // CERT.SF / CERT#.SF 757 je = new JarEntry(numKeys == 1 ? CERT_SF_NAME : 758 (String.format(CERT_SF_MULTI_NAME, k))); 759 je.setTime(timestamp); 760 outputJar.putNextEntry(je); 761 ByteArrayOutputStream baos = new ByteArrayOutputStream(); 762 writeSignatureFile(manifest, baos, getDigestAlgorithm(publicKey[k])); 763 byte[] signedData = baos.toByteArray(); 764 outputJar.write(signedData); 765 766 // CERT.{EC,RSA} / CERT#.{EC,RSA} 767 final String keyType = publicKey[k].getPublicKey().getAlgorithm(); 768 je = new JarEntry(numKeys == 1 ? 769 (String.format(CERT_SIG_NAME, keyType)) : 770 (String.format(CERT_SIG_MULTI_NAME, k, keyType))); 771 je.setTime(timestamp); 772 outputJar.putNextEntry(je); 773 writeSignatureBlock(new CMSProcessableByteArray(signedData), 774 publicKey[k], privateKey[k], outputJar); 775 } 776 } 777 778 /** 779 * Tries to load a JSE Provider by class name. This is for custom PrivateKey 780 * types that might be stored in PKCS#11-like storage. 781 */ 782 private static void loadProviderIfNecessary(String providerClassName) { 783 if (providerClassName == null) { 784 return; 785 } 786 787 final Class<?> klass; 788 try { 789 final ClassLoader sysLoader = ClassLoader.getSystemClassLoader(); 790 if (sysLoader != null) { 791 klass = sysLoader.loadClass(providerClassName); 792 } else { 793 klass = Class.forName(providerClassName); 794 } 795 } catch (ClassNotFoundException e) { 796 e.printStackTrace(); 797 System.exit(1); 798 return; 799 } 800 801 Constructor<?> constructor = null; 802 for (Constructor<?> c : klass.getConstructors()) { 803 if (c.getParameterTypes().length == 0) { 804 constructor = c; 805 break; 806 } 807 } 808 if (constructor == null) { 809 System.err.println("No zero-arg constructor found for " + providerClassName); 810 System.exit(1); 811 return; 812 } 813 814 final Object o; 815 try { 816 o = constructor.newInstance(); 817 } catch (Exception e) { 818 e.printStackTrace(); 819 System.exit(1); 820 return; 821 } 822 if (!(o instanceof Provider)) { 823 System.err.println("Not a Provider class: " + providerClassName); 824 System.exit(1); 825 } 826 827 Security.insertProviderAt((Provider) o, 1); 828 } 829 830 private static void usage() { 831 System.err.println("Usage: signapk [-w] " + 832 "[-a <alignment>] " + 833 "[-providerClass <className>] " + 834 "publickey.x509[.pem] privatekey.pk8 " + 835 "[publickey2.x509[.pem] privatekey2.pk8 ...] " + 836 "input.jar output.jar"); 837 System.exit(2); 838 } 839 840 public static void main(String[] args) { 841 if (args.length < 4) usage(); 842 843 sBouncyCastleProvider = new BouncyCastleProvider(); 844 Security.addProvider(sBouncyCastleProvider); 845 846 boolean signWholeFile = false; 847 String providerClass = null; 848 String providerArg = null; 849 int alignment = 4; 850 851 int argstart = 0; 852 while (argstart < args.length && args[argstart].startsWith("-")) { 853 if ("-w".equals(args[argstart])) { 854 signWholeFile = true; 855 ++argstart; 856 } else if ("-providerClass".equals(args[argstart])) { 857 if (argstart + 1 >= args.length) { 858 usage(); 859 } 860 providerClass = args[++argstart]; 861 ++argstart; 862 } else if ("-a".equals(args[argstart])) { 863 alignment = Integer.parseInt(args[++argstart]); 864 ++argstart; 865 } else { 866 usage(); 867 } 868 } 869 870 if ((args.length - argstart) % 2 == 1) usage(); 871 int numKeys = ((args.length - argstart) / 2) - 1; 872 if (signWholeFile && numKeys > 1) { 873 System.err.println("Only one key may be used with -w."); 874 System.exit(2); 875 } 876 877 loadProviderIfNecessary(providerClass); 878 879 String inputFilename = args[args.length-2]; 880 String outputFilename = args[args.length-1]; 881 882 JarFile inputJar = null; 883 FileOutputStream outputFile = null; 884 int hashes = 0; 885 886 try { 887 File firstPublicKeyFile = new File(args[argstart+0]); 888 889 X509Certificate[] publicKey = new X509Certificate[numKeys]; 890 try { 891 for (int i = 0; i < numKeys; ++i) { 892 int argNum = argstart + i*2; 893 publicKey[i] = readPublicKey(new File(args[argNum])); 894 hashes |= getDigestAlgorithm(publicKey[i]); 895 } 896 } catch (IllegalArgumentException e) { 897 System.err.println(e); 898 System.exit(1); 899 } 900 901 // Set the ZIP file timestamp to the starting valid time 902 // of the 0th certificate plus one hour (to match what 903 // we've historically done). 904 long timestamp = publicKey[0].getNotBefore().getTime() + 3600L * 1000; 905 906 PrivateKey[] privateKey = new PrivateKey[numKeys]; 907 for (int i = 0; i < numKeys; ++i) { 908 int argNum = argstart + i*2 + 1; 909 privateKey[i] = readPrivateKey(new File(args[argNum])); 910 } 911 inputJar = new JarFile(new File(inputFilename), false); // Don't verify. 912 913 outputFile = new FileOutputStream(outputFilename); 914 915 916 if (signWholeFile) { 917 SignApk.signWholeFile(inputJar, firstPublicKeyFile, 918 publicKey[0], privateKey[0], outputFile); 919 } else { 920 JarOutputStream outputJar = new JarOutputStream(outputFile); 921 922 // For signing .apks, use the maximum compression to make 923 // them as small as possible (since they live forever on 924 // the system partition). For OTA packages, use the 925 // default compression level, which is much much faster 926 // and produces output that is only a tiny bit larger 927 // (~0.1% on full OTA packages I tested). 928 outputJar.setLevel(9); 929 930 Manifest manifest = addDigestsToManifest(inputJar, hashes); 931 copyFiles(manifest, inputJar, outputJar, timestamp, alignment); 932 signFile(manifest, inputJar, publicKey, privateKey, outputJar); 933 outputJar.close(); 934 } 935 } catch (Exception e) { 936 e.printStackTrace(); 937 System.exit(1); 938 } finally { 939 try { 940 if (inputJar != null) inputJar.close(); 941 if (outputFile != null) outputFile.close(); 942 } catch (IOException e) { 943 e.printStackTrace(); 944 System.exit(1); 945 } 946 } 947 } 948 } 949
