List of usage examples for com.lowagie.text.pdf PdfReader getCertificationLevel
public int getCertificationLevel()
From source file:es.gob.afirma.signers.pades.PAdESSigner.java
License:Open Source License
@SuppressWarnings("boxing") static byte[] signPDF(final PrivateKey key, final java.security.cert.Certificate[] certChain, final byte[] inPDF, final Properties extraParams, final String algorithm) throws IOException, AOException, DocumentException, NoSuchAlgorithmException, CertificateException { // ********************************************************************************************************************* // **************** LECTURA PARAMETROS ADICIONALES ********************************************************************* // ********************************************************************************************************************* // Imagen de la rubrica final Image rubric = getRubricImage(extraParams.getProperty("signatureRubricImage")); //$NON-NLS-1$ // Usar hora y fecha del sistema final boolean useSystemDateTime = Boolean .parseBoolean(extraParams.getProperty("applySystemDate", Boolean.TRUE.toString())); //$NON-NLS-1$ // Motivo de la firma final String reason = extraParams.getProperty("signReason"); //$NON-NLS-1$ // Nombre del campo de firma preexistente en el PDF a usar final String signatureField = extraParams.getProperty("signatureField"); //$NON-NLS-1$ // Lugar de realizacion de la firma final String signatureProductionCity = extraParams.getProperty("signatureProductionCity"); //$NON-NLS-1$ // Datos de contacto (correo electronico) del firmante final String signerContact = extraParams.getProperty("signerContact"); //$NON-NLS-1$ // Pagina donde situar la firma visible int page = LAST_PAGE; try {/*from w ww.j ava 2 s .co m*/ page = Integer.parseInt(extraParams.getProperty("signaturePage")); //$NON-NLS-1$ } catch (final Exception e) { /* Se deja la pagina tal y como esta */ } // Nombre del subfiltro de firma en el diccionario PDF final String signatureSubFilter = extraParams.getProperty("signatureSubFilter"); //$NON-NLS-1$ // ****************** // ** Adjuntos ****** // Contenido a adjuntar (en Base64) final String b64Attachment = extraParams.getProperty("attach"); //$NON-NLS-1$ // Nombre que se pondra al fichero adjunto en el PDF final String attachmentFileName = extraParams.getProperty("attachFileName"); //$NON-NLS-1$ // Descripcion del adjunto final String attachmentDescription = extraParams.getProperty("attachDescription"); //$NON-NLS-1$ // ** Fin Adjuntos ** // ****************** // Nivel de certificacion del PDF int certificationLevel; try { certificationLevel = extraParams.getProperty("certificationLevel") != null ? //$NON-NLS-1$ Integer.parseInt(extraParams.getProperty("certificationLevel")) : //$NON-NLS-1$ -1; } catch (final Exception e) { certificationLevel = UNDEFINED; } // ***************************** // **** Texto firma visible **** // Texto en capa 4 final String layer4Text = extraParams.getProperty("layer4Text"); //$NON-NLS-1$ // Texto en capa 2 final String layer2Text = extraParams.getProperty("layer2Text"); //$NON-NLS-1$ // Tipo de letra en capa 2 int layer2FontFamily; try { layer2FontFamily = extraParams.getProperty("layer2FontFamily") != null ? //$NON-NLS-1$ Integer.parseInt(extraParams.getProperty("layer2FontFamily")) : //$NON-NLS-1$ -1; } catch (final Exception e) { layer2FontFamily = UNDEFINED; } // Tamano del tipo de letra en capa 2 int layer2FontSize; try { layer2FontSize = extraParams.getProperty("layer2FontSize") != null ? //$NON-NLS-1$ Integer.parseInt(extraParams.getProperty("layer2FontSize")) : //$NON-NLS-1$ -1; } catch (final Exception e) { layer2FontSize = UNDEFINED; } // Estilo del tipo de letra en capa 2 int layer2FontStyle; try { layer2FontStyle = extraParams.getProperty("layer2FontStyle") != null ? //$NON-NLS-1$ Integer.parseInt(extraParams.getProperty("layer2FontStyle")) : //$NON-NLS-1$ -1; } catch (final Exception e) { layer2FontStyle = UNDEFINED; } // Color del tipo de letra en capa 2 final String layer2FontColor = extraParams.getProperty("layer2FontColor"); //$NON-NLS-1$ // ** Fin texto firma visible ** // ***************************** // Contrasena del propietario del PDF String ownerPassword = extraParams.getProperty("ownerPassword"); //$NON-NLS-1$ // Contrasena del usuario del PDF final String userPassword = extraParams.getProperty("userPassword"); //$NON-NLS-1$ // ********************************************************************************************************************* // **************** FIN LECTURA PARAMETROS ADICIONALES ***************************************************************** // ********************************************************************************************************************* PdfReader pdfReader; try { if (ownerPassword != null) { pdfReader = new PdfReader(inPDF, ownerPassword.getBytes()); } else if (userPassword != null) { pdfReader = new PdfReader(inPDF, userPassword.getBytes()); } else { pdfReader = new PdfReader(inPDF); } } catch (final BadPasswordException e) { // Comprobamos que el signer esta en modo interactivo, y si no lo // esta no pedimos contrasena por dialogo, principalmente para no interrumpir un firmado por lotes // desatendido if (Boolean.TRUE.toString().equalsIgnoreCase(extraParams.getProperty("headLess"))) { //$NON-NLS-1$ throw new BadPdfPasswordException(e); } // La contrasena que nos han proporcionada no es buena o no nos // proporcionaron ninguna ownerPassword = new String(AOUIFactory.getPassword( ownerPassword == null ? PDFMessages.getString("AOPDFSigner.0") //$NON-NLS-1$ : PDFMessages.getString("AOPDFSigner.1"), //$NON-NLS-1$ null)); try { pdfReader = new PdfReader(inPDF, ownerPassword.getBytes()); } catch (final BadPasswordException e2) { throw new BadPdfPasswordException(e2); } } catch (final IOException e) { throw new InvalidPdfException(e); } if (pdfReader.getCertificationLevel() == PdfSignatureAppearance.CERTIFIED_NO_CHANGES_ALLOWED && !Boolean.parseBoolean(extraParams.getProperty("allowSigningCertifiedPdfs"))) { //$NON-NLS-1$ // Si no permitimos dialogos graficos o directamente hemos indicado que no permitimos firmar PDF certificados lanzamos // una excepcion if (Boolean.parseBoolean(extraParams.getProperty("headLess")) //$NON-NLS-1$ || "false".equalsIgnoreCase(extraParams.getProperty("allowSigningCertifiedPdfs"))) { //$NON-NLS-1$ //$NON-NLS-2$ throw new PdfIsCertifiedException(); } // En otro caso, perguntamos al usuario if (AOUIFactory.NO_OPTION == AOUIFactory.showConfirmDialog(null, PDFMessages.getString("AOPDFSigner.8"), //$NON-NLS-1$ PDFMessages.getString("AOPDFSigner.9"), //$NON-NLS-1$ AOUIFactory.YES_NO_OPTION, AOUIFactory.WARNING_MESSAGE)) { throw new AOCancelledOperationException( "El usuario no ha permitido la firma de un PDF certificado"); //$NON-NLS-1$ } } // Los derechos van firmados por Adobe, y como desde iText se invalidan // es mejor quitarlos pdfReader.removeUsageRights(); final ByteArrayOutputStream baos = new ByteArrayOutputStream(); // Activar el atributo de "agregar firma" (cuarto parametro del metodo // "PdfStamper.createSignature") hace que se cree una nueva revision del // documento y evita que las firmas previas queden invalidadas. Sin embargo, este // exige que el PDF no incorpore ningun error, asi que lo mantendremos desactivado // para la primera firma y activado para las subsiguientes. Un error incorporado // en un PDF erroneo puede quedar subsanado en su version firmada, haciendo // posible incorporar nuevas firmas agregando revisiones del documento. final PdfStamper stp; try { stp = PdfStamper.createSignature(pdfReader, // PDF de entrada baos, // Salida '\0', // Mantener version null, // No crear temporal pdfReader.getAcroFields().getSignatureNames().size() > 0 // Si hay mas firmas, creo una revision ); } catch (final BadPasswordException e) { throw new PdfIsPasswordProtectedException(e); } // Aplicamos todos los atributos de firma final PdfSignatureAppearance sap = stp.getSignatureAppearance(); stp.setFullCompression(); sap.setAcro6Layers(true); // PAdES parte 3 seccion 4.7 - Habilitacion para LTV stp.getWriter().addDeveloperExtension(new PdfDeveloperExtension(new PdfName("ESIC"), //$NON-NLS-1$ PdfWriter.PDF_VERSION_1_7, 1)); // Adjuntos if (b64Attachment != null && attachmentFileName != null) { byte[] attachment = null; try { attachment = Base64.decode(b64Attachment); } catch (final IOException e) { LOGGER.warning("Se ha indicado un adjunto, pero no estaba en formato Base64, se ignorara : " + e); //$NON-NLS-1$ } if (attachment != null) { stp.getWriter().addFileAttachment(attachmentDescription, attachment, null, attachmentFileName); } } // iText antiguo sap.setRender(PdfSignatureAppearance.SignatureRenderDescription); // En iText nuevo seria "sap.setRenderingMode(PdfSignatureAppearance.RenderingMode.NAME_AND_DESCRIPTION);" // Razon de firma if (reason != null) { sap.setReason(reason); } // Establecer fecha local del equipo if (useSystemDateTime) { sap.setSignDate(new GregorianCalendar()); } // Gestion de los cifrados if (pdfReader.isEncrypted() && (ownerPassword != null || userPassword != null)) { if (Boolean.TRUE.toString().equalsIgnoreCase(extraParams.getProperty("avoidEncryptingSignedPdfs"))) { //$NON-NLS-1$ LOGGER.info( "Aunque el PDF original estaba encriptado no se encriptara el PDF firmado (se establecio el indicativo 'avoidEncryptingSignedPdfs')" //$NON-NLS-1$ ); } else { LOGGER.info("El PDF original estaba encriptado, se intentara encriptar tambien el PDF firmado" //$NON-NLS-1$ ); try { stp.setEncryption(ownerPassword != null ? ownerPassword.getBytes() : null, userPassword != null ? userPassword.getBytes() : null, pdfReader.getPermissions(), pdfReader.getCryptoMode()); } catch (final DocumentException de) { LOGGER.warning("No se ha podido cifrar el PDF destino, se escribira sin contrasena: " + de //$NON-NLS-1$ ); } } } // Pagina en donde se imprime la firma if (page == LAST_PAGE) { page = pdfReader.getNumberOfPages(); } // Posicion de la firma final Rectangle signaturePositionOnPage = getSignaturePositionOnPage(extraParams); if (signaturePositionOnPage != null && signatureField == null) { sap.setVisibleSignature(signaturePositionOnPage, page, null); } else if (signatureField != null) { sap.setVisibleSignature(signatureField); } // Localizacion en donde se produce la firma if (signatureProductionCity != null) { sap.setLocation(signatureProductionCity); } // Contacto del firmante if (signerContact != null) { sap.setContact(signerContact); } // Rubrica de la firma if (rubric != null) { sap.setImage(rubric); sap.setLayer2Text(""); //$NON-NLS-1$ sap.setLayer4Text(""); //$NON-NLS-1$ } // ************************** // ** Texto en las capas **** // ************************** // Capa 2 if (layer2Text != null) { sap.setLayer2Text(layer2Text); final int layer2FontColorR; final int layer2FontColorG; final int layer2FontColorB; if ("black".equalsIgnoreCase(layer2FontColor)) { //$NON-NLS-1$ layer2FontColorR = 0; layer2FontColorG = 0; layer2FontColorB = 0; } else if ("white".equalsIgnoreCase(layer2FontColor)) { //$NON-NLS-1$ layer2FontColorR = 255; layer2FontColorG = 255; layer2FontColorB = 255; } else if ("lightGray".equalsIgnoreCase(layer2FontColor)) { //$NON-NLS-1$ layer2FontColorR = 192; layer2FontColorG = 192; layer2FontColorB = 192; } else if ("gray".equalsIgnoreCase(layer2FontColor)) { //$NON-NLS-1$ layer2FontColorR = 128; layer2FontColorG = 128; layer2FontColorB = 128; } else if ("darkGray".equalsIgnoreCase(layer2FontColor)) { //$NON-NLS-1$ layer2FontColorR = 64; layer2FontColorG = 64; layer2FontColorB = 64; } else if ("red".equalsIgnoreCase(layer2FontColor)) { //$NON-NLS-1$ layer2FontColorR = 255; layer2FontColorG = 0; layer2FontColorB = 0; } else if ("pink".equalsIgnoreCase(layer2FontColor)) { //$NON-NLS-1$ layer2FontColorR = 255; layer2FontColorG = 175; layer2FontColorB = 175; } else if (layer2FontColor == null) { layer2FontColorR = 0; layer2FontColorG = 0; layer2FontColorB = 0; } else { LOGGER.warning("No se soporta el color '" + layer2FontColor //$NON-NLS-1$ + "' para el texto de la capa 4, se usara negro"); //$NON-NLS-1$ layer2FontColorR = 0; layer2FontColorG = 0; layer2FontColorB = 0; } com.lowagie.text.Font font; try { Class<?> colorClass; if (Platform.getOS() == OS.ANDROID) { colorClass = Class.forName("harmony.java.awt.Color"); //$NON-NLS-1$ } else { colorClass = Class.forName("java.awt.Color"); //$NON-NLS-1$ } final Object color = colorClass.getConstructor(Integer.TYPE, Integer.TYPE, Integer.TYPE) .newInstance(layer2FontColorR, layer2FontColorG, layer2FontColorB); font = com.lowagie.text.Font.class .getConstructor(Integer.TYPE, Integer.TYPE, Integer.TYPE, colorClass).newInstance( // Family (COURIER = 0, HELVETICA = 1, TIMES_ROMAN = 2, SYMBOL = 3, ZAPFDINGBATS = 4) layer2FontFamily == UNDEFINED ? COURIER : layer2FontFamily, // Size (DEFAULTSIZE = 12) layer2FontSize == UNDEFINED ? DEFAULT_LAYER_2_FONT_SIZE : layer2FontSize, // Style (NORMAL = 0, BOLD = 1, ITALIC = 2, BOLDITALIC = 3, UNDERLINE = 4, STRIKETHRU = 8) layer2FontStyle == UNDEFINED ? com.lowagie.text.Font.NORMAL : layer2FontStyle, // Color color); } catch (Exception e) { font = new com.lowagie.text.Font( // Family (COURIER = 0, HELVETICA = 1, TIMES_ROMAN = 2, SYMBOL = 3, ZAPFDINGBATS = 4) layer2FontFamily == UNDEFINED ? COURIER : layer2FontFamily, // Size (DEFAULTSIZE = 12) layer2FontSize == UNDEFINED ? DEFAULT_LAYER_2_FONT_SIZE : layer2FontSize, // Style (NORMAL = 0, BOLD = 1, ITALIC = 2, BOLDITALIC = 3, UNDERLINE = 4, STRIKETHRU = 8) layer2FontStyle == UNDEFINED ? com.lowagie.text.Font.NORMAL : layer2FontStyle, // Color null); } sap.setLayer2Font(font); } // Capa 4 if (layer4Text != null) { sap.setLayer4Text(layer4Text); } // *************************** // ** Fin texto en las capas * // *************************** sap.setCrypto(null, certChain, null, null); final PdfSignature dic = new PdfSignature(PdfName.ADOBE_PPKLITE, signatureSubFilter != null && !"".equals(signatureSubFilter) ? new PdfName(signatureSubFilter) //$NON-NLS-1$ : PdfName.ADBE_PKCS7_DETACHED); // Fecha de firma if (sap.getSignDate() != null) { dic.setDate(new PdfDate(sap.getSignDate())); } dic.setName(PdfPKCS7.getSubjectFields((X509Certificate) certChain[0]).getField("CN")); //$NON-NLS-1$ if (sap.getReason() != null) { dic.setReason(sap.getReason()); } // Lugar de la firma if (sap.getLocation() != null) { dic.setLocation(sap.getLocation()); } // Contacto del firmante if (sap.getContact() != null) { dic.setContact(sap.getContact()); } sap.setCryptoDictionary(dic); // Certificacion del PDF (NOT_CERTIFIED = 0, CERTIFIED_NO_CHANGES_ALLOWED = 1, // CERTIFIED_FORM_FILLING = 2, CERTIFIED_FORM_FILLING_AND_ANNOTATIONS = 3) if (certificationLevel != -1) { sap.setCertificationLevel(certificationLevel); } // Reservamos el espacio necesario en el PDF para insertar la firma final HashMap<PdfName, Integer> exc = new HashMap<PdfName, Integer>(); exc.put(PdfName.CONTENTS, Integer.valueOf(CSIZE * 2 + 2)); sap.preClose(exc); // ******************************************************************************** // **************** CALCULO DEL SIGNED DATA *************************************** // ******************************************************************************** // La norma PAdES establece que si el algoritmo de huella digital es SHA1 debe usarse SigningCertificateV2, y en cualquier // otro caso deberia usarse SigningCertificateV2 boolean signingCertificateV2; if (extraParams.containsKey("signingCertificateV2")) { //$NON-NLS-1$ signingCertificateV2 = Boolean.parseBoolean(extraParams.getProperty("signingCertificateV2")); //$NON-NLS-1$ } else { signingCertificateV2 = !"SHA1".equals(AOSignConstants.getDigestAlgorithmName(algorithm)); //$NON-NLS-1$ } byte[] completeCAdESSignature = GenCAdESEPESSignedData.generateSignedData( new P7ContentSignerParameters(inPDF, algorithm), true, // omitContent new AdESPolicy(extraParams), signingCertificateV2, key, certChain, MessageDigest.getInstance(AOSignConstants.getDigestAlgorithmName(algorithm)) .digest(AOUtil.getDataFromInputStream(sap.getRangeStream())), AOSignConstants.getDigestAlgorithmName(algorithm), true, // Modo PAdES PDF_OID, extraParams.getProperty("contentDescription") != null //$NON-NLS-1$ ? extraParams.getProperty("contentDescription") //$NON-NLS-1$ : PDF_DESC); //***************** SELLO DE TIEMPO **************** final String tsa = extraParams.getProperty("tsaURL"); //$NON-NLS-1$ URI tsaURL; if (tsa != null) { try { tsaURL = new URI(tsa); } catch (final Exception e) { LOGGER.warning("Se ha indicado una URL de TSA invalida (" + tsa //$NON-NLS-1$ + "), no se anadira sello de tiempo: " + e); //$NON-NLS-1$ tsaURL = null; } if (tsaURL != null) { final String tsaPolicy = extraParams.getProperty("tsaPolicy"); //$NON-NLS-1$ if (tsaPolicy == null) { LOGGER.warning( "Se ha indicado una URL de TSA pero no una politica, no se anadira sello de tiempo"); //$NON-NLS-1$ } else { final String tsaHashAlgorithm = extraParams.getProperty("tsaHashAlgorithm"); //$NON-NLS-1$ completeCAdESSignature = new CMSTimestamper( !Boolean.FALSE.toString().equalsIgnoreCase(extraParams.getProperty("tsaRequireCert")), //$NON-NLS-1$ tsaPolicy, tsaURL, extraParams.getProperty("tsaUsr"), //$NON-NLS-1$ extraParams.getProperty("tsaPwd"), //$NON-NLS-1$ extraParams.getProperty("tsaExtensionOid") != null //$NON-NLS-1$ && extraParams.getProperty("tsaExtensionValueBase64") != null ? //$NON-NLS-1$ new TsaRequestExtension[] { new TsaRequestExtension( extraParams.getProperty("tsaExtensionOid"), //$NON-NLS-1$ Boolean.getBoolean(extraParams .getProperty("tsaExtensionCritical", "false")), //$NON-NLS-1$ //$NON-NLS-2$ Base64.decode( extraParams.getProperty("tsaExtensionValueBase64")) //$NON-NLS-1$ ) } : null).addTimestamp(completeCAdESSignature, AOAlgorithmID.getOID(AOSignConstants.getDigestAlgorithmName( tsaHashAlgorithm != null ? tsaHashAlgorithm : "SHA1"))); //$NON-NLS-1$ } } } //************** FIN SELLO DE TIEMPO **************** // ******************************************************************************** // *************** FIN CALCULO DEL SIGNED DATA ************************************ // ******************************************************************************** final byte[] outc = new byte[CSIZE]; if (outc.length < completeCAdESSignature.length) { throw new AOException("La firma generada tiene un tamano (" + completeCAdESSignature.length //$NON-NLS-1$ + ") mayor que el permitido (" + outc.length + ")" //$NON-NLS-1$ //$NON-NLS-2$ ); } final PdfDictionary dic2 = new PdfDictionary(); System.arraycopy(completeCAdESSignature, 0, outc, 0, completeCAdESSignature.length); dic2.put(PdfName.CONTENTS, new PdfString(outc).setHexWriting(true)); sap.close(dic2); return baos.toByteArray(); }
From source file:net.sf.jsignpdf.verify.VerifierLogic.java
License:Mozilla Public License
/** * Verifies signature(s) in PDF document. * //from w ww . jav a2 s . co m * @param tmpReader * PdfReader for given PDF * @return */ @SuppressWarnings("unchecked") private VerificationResult verify(final PdfReader tmpReader) { final VerificationResult tmpResult = new VerificationResult(); try { final AcroFields tmpAcroFields = tmpReader.getAcroFields(); final List<String> tmpNames = tmpAcroFields.getSignatureNames(); tmpResult.setTotalRevisions(tmpAcroFields.getTotalRevisions()); final int lastSignatureIdx = tmpNames.size() - 1; if (lastSignatureIdx < 0) { // there is no signature tmpResult.setWithoutSignature(); } for (int i = lastSignatureIdx; i >= 0; i--) { final String name = tmpNames.get(i); final SignatureVerification tmpVerif = new SignatureVerification(name); tmpVerif.setLastSignature(i == lastSignatureIdx); tmpVerif.setWholeDocument(tmpAcroFields.signatureCoversWholeDocument(name)); tmpVerif.setRevision(tmpAcroFields.getRevision(name)); final PdfPKCS7 pk = tmpAcroFields.verifySignature(name); final TimeStampToken tst = pk.getTimeStampToken(); tmpVerif.setTsTokenPresent(tst != null); tmpVerif.setTsTokenValidationResult(validateTimeStampToken(tst)); tmpVerif.setDate(pk.getTimeStampDate() != null ? pk.getTimeStampDate() : pk.getSignDate()); tmpVerif.setLocation(pk.getLocation()); tmpVerif.setReason(pk.getReason()); tmpVerif.setSignName(pk.getSignName()); final Certificate pkc[] = pk.getCertificates(); final X509Name tmpX509Name = PdfPKCS7.getSubjectFields(pk.getSigningCertificate()); tmpVerif.setSubject(tmpX509Name.toString()); tmpVerif.setModified(!pk.verify()); tmpVerif.setOcspPresent(pk.getOcsp() != null); tmpVerif.setOcspValid(pk.isRevocationValid()); tmpVerif.setCrlPresent(pk.getCRLs() != null && pk.getCRLs().size() > 0); tmpVerif.setFails(PdfPKCS7.verifyCertificates(pkc, kall, pk.getCRLs(), tmpVerif.getDate())); tmpVerif.setSigningCertificate(pk.getSigningCertificate()); // generate CertPath List<Certificate> certList = Arrays.asList(pkc); CertificateFactory cf = CertificateFactory.getInstance("X.509"); CertPath cp = cf.generateCertPath(certList); tmpVerif.setCertPath(cp); // to save time - check OCSP in certificate only if document's OCSP is not present and valid if (!tmpVerif.isOcspValid()) { // try to get OCSP url from signing certificate String url = PdfPKCS7.getOCSPURL((X509Certificate) pk.getSigningCertificate()); tmpVerif.setOcspInCertPresent(url != null); if (url != null) { // OCSP url is found in signing certificate - verify certificate with that url tmpVerif.setOcspInCertValid(validateCertificateOCSP(pk.getSignCertificateChain(), url)); } } String certificateAlias = kall.getCertificateAlias(pk.getSigningCertificate()); if (certificateAlias != null) { // this means that signing certificate is directly trusted String verifyCertificate = PdfPKCS7.verifyCertificate(pk.getSigningCertificate(), pk.getCRLs(), tmpVerif.getDate()); if (verifyCertificate == null) { // this means that signing certificate is valid tmpVerif.setSignCertTrustedAndValid(true); } } final InputStream revision = tmpAcroFields.extractRevision(name); try { final PdfReader revisionReader = new PdfReader(revision); tmpVerif.setCertLevelCode(revisionReader.getCertificationLevel()); } finally { if (revision != null) { revision.close(); } } tmpResult.addVerification(tmpVerif); if (failFast && tmpVerif.containsError()) { return tmpResult; } } } catch (Exception e) { tmpResult.setException(e); } return tmpResult; }
From source file:org.signserver.module.pdfsigner.PDFSigner.java
License:Open Source License
protected byte[] addSignatureToPDFDocument(final ICryptoInstance crypto, PDFSignerParameters params, byte[] pdfbytes, byte[] password, int contentEstimated, final ProcessRequest request, final RequestContext context) throws IOException, DocumentException, CryptoTokenOfflineException, SignServerException, IllegalRequestException { // when given a content length (i.e. non-zero), it means we are running a second try boolean secondTry = contentEstimated != 0; // get signing cert certificate chain and private key final List<Certificate> certs = getSigningCertificateChain(crypto); if (certs == null) { throw new SignServerException("Null certificate chain. This signer needs a certificate."); }//from w w w .j a va2 s. c om final List<Certificate> includedCerts = includedCertificates(certs); Certificate[] certChain = includedCerts.toArray(new Certificate[includedCerts.size()]); PrivateKey privKey = crypto.getPrivateKey(); // need to check digest algorithms for DSA private key at signing // time since we can't be sure what key a configured alias selector gives back if (privKey instanceof DSAPrivateKey) { if (!"SHA1".equals(digestAlgorithm)) { throw new IllegalRequestException( "Only SHA1 is permitted as digest algorithm for DSA private keys"); } } PdfReader reader = new PdfReader(pdfbytes, password); boolean appendMode = true; // TODO: This could be good to have as a property in the future int pdfVersion; try { pdfVersion = Integer.parseInt(Character.toString(reader.getPdfVersion())); } catch (NumberFormatException e) { pdfVersion = 0; } if (LOG.isDebugEnabled()) { LOG.debug("PDF version: " + pdfVersion); } // Don't certify already certified documents if (reader.getCertificationLevel() != PdfSignatureAppearance.NOT_CERTIFIED && params.getCertification_level() != PdfSignatureAppearance.NOT_CERTIFIED) { throw new IllegalRequestException("Will not certify an already certified document"); } // Don't sign documents where the certification does not allow it if (reader.getCertificationLevel() == PdfSignatureAppearance.CERTIFIED_NO_CHANGES_ALLOWED || reader.getCertificationLevel() == PdfSignatureAppearance.CERTIFIED_FORM_FILLING) { throw new IllegalRequestException("Will not sign a certified document where signing is not allowed"); } Permissions currentPermissions = Permissions.fromInt(reader.getPermissions()); if (params.getSetPermissions() != null && params.getRemovePermissions() != null) { throw new SignServerException("Signer " + workerId + " missconfigured. Only one of " + SET_PERMISSIONS + " and " + REMOVE_PERMISSIONS + " should be specified."); } Permissions newPermissions; if (params.getSetPermissions() != null) { newPermissions = params.getSetPermissions(); } else if (params.getRemovePermissions() != null) { newPermissions = currentPermissions.withRemoved(params.getRemovePermissions()); } else { newPermissions = null; } Permissions rejectPermissions = Permissions.fromSet(params.getRejectPermissions()); byte[] userPassword = reader.computeUserPassword(); int cryptoMode = reader.getCryptoMode(); if (LOG.isDebugEnabled()) { StringBuilder buff = new StringBuilder(); buff.append("Current permissions: ").append(currentPermissions).append("\n") .append("Remove permissions: ").append(params.getRemovePermissions()).append("\n") .append("Reject permissions: ").append(rejectPermissions).append("\n") .append("New permissions: ").append(newPermissions).append("\n").append("userPassword: ") .append(userPassword == null ? "null" : "yes").append("\n").append("ownerPassword: ") .append(password == null ? "no" : (isUserPassword(reader, password) ? "no" : "yes")) .append("\n").append("setOwnerPassword: ") .append(params.getSetOwnerPassword() == null ? "no" : "yes").append("\n").append("cryptoMode: ") .append(cryptoMode); LOG.debug(buff.toString()); } if (appendMode && (newPermissions != null || params.getSetOwnerPassword() != null)) { appendMode = false; if (LOG.isDebugEnabled()) { LOG.debug("Changing appendMode to false to be able to change permissions"); } } ByteArrayOutputStream fout = new ByteArrayOutputStream(); // increase PDF version if needed by digest algorithm final char updatedPdfVersion; if (minimumPdfVersion > pdfVersion) { updatedPdfVersion = Character.forDigit(minimumPdfVersion, 10); if (LOG.isDebugEnabled()) { LOG.debug("Need to upgrade PDF to version 1." + updatedPdfVersion); } // check that the document isn't already signed // when trying to upgrade version final AcroFields af = reader.getAcroFields(); final List<String> sigNames = af.getSignatureNames(); if (!sigNames.isEmpty()) { // TODO: in the future we might want to support // a fallback option in this case to allow re-signing using the same version (using append) throw new IllegalRequestException( "Can not upgrade an already signed PDF and a higher version is required to support the configured digest algorithm"); } appendMode = false; } else { updatedPdfVersion = '\0'; } PdfStamper stp = PdfStamper.createSignature(reader, fout, updatedPdfVersion, null, appendMode); PdfSignatureAppearance sap = stp.getSignatureAppearance(); // Set the new permissions if (newPermissions != null || params.getSetOwnerPassword() != null) { if (cryptoMode < 0) { cryptoMode = PdfWriter.STANDARD_ENCRYPTION_128; if (LOG.isDebugEnabled()) { LOG.debug("Setting default encryption algorithm"); } } if (newPermissions == null) { newPermissions = currentPermissions; } if (params.getSetOwnerPassword() != null) { password = params.getSetOwnerPassword().getBytes("ISO-8859-1"); } else if (isUserPassword(reader, password)) { // We do not have an owner password so lets use a random one password = new byte[16]; random.nextBytes(password); if (LOG.isDebugEnabled()) { LOG.debug("Setting random owner password"); } } stp.setEncryption(userPassword, password, newPermissions.asInt(), cryptoMode); currentPermissions = newPermissions; } // Reject if any permissions are rejected and the document does not use a permission password // or if it contains any of the rejected permissions if (rejectPermissions.asInt() != 0) { if (cryptoMode < 0 || currentPermissions.containsAnyOf(rejectPermissions)) { throw new IllegalRequestException("Document contains permissions not allowed by this signer"); } } // include signer certificate crl inside cms package if requested CRL[] crlList = null; if (params.isEmbed_crl()) { crlList = getCrlsForChain(certs); } sap.setCrypto(null, certChain, crlList, PdfSignatureAppearance.SELF_SIGNED); // add visible signature if requested if (params.isAdd_visible_signature()) { int signaturePage = getPageNumberForSignature(reader, params); sap.setVisibleSignature(new com.lowagie.text.Rectangle(params.getVisible_sig_rectangle_llx(), params.getVisible_sig_rectangle_lly(), params.getVisible_sig_rectangle_urx(), params.getVisible_sig_rectangle_ury()), signaturePage, null); // set custom image if requested if (params.isUse_custom_image()) { sap.setAcro6Layers(true); PdfTemplate n2 = sap.getLayer(2); params.getCustom_image().setAbsolutePosition(0, 0); n2.addImage(params.getCustom_image()); } } // Certification level sap.setCertificationLevel(params.getCertification_level()); PdfSignature dic = new PdfSignature(PdfName.ADOBE_PPKLITE, new PdfName("adbe.pkcs7.detached")); dic.setReason(params.getReason()); dic.setLocation(params.getLocation()); dic.setDate(new PdfDate(Calendar.getInstance())); sap.setCryptoDictionary(dic); // add timestamp to signature if requested TSAClient tsc = null; if (params.isUse_timestamp()) { final String tsaUrl = params.getTsa_url(); if (tsaUrl != null) { tsc = getTimeStampClient(params.getTsa_url(), params.getTsa_username(), params.getTsa_password()); } else { tsc = new InternalTSAClient(getWorkerSession(), params.getTsa_worker(), params.getTsa_username(), params.getTsa_password()); } } // embed ocsp response in cms package if requested // for ocsp request to be formed there needs to be issuer certificate in // chain byte[] ocsp = null; if (params.isEmbed_ocsp_response() && certChain.length >= 2) { String url; try { url = PdfPKCS7.getOCSPURL((X509Certificate) certChain[0]); if (url != null && url.length() > 0) { ocsp = new OcspClientBouncyCastle((X509Certificate) certChain[0], (X509Certificate) certChain[1], url).getEncoded(); } } catch (CertificateParsingException e) { throw new SignServerException("Error getting OCSP URL from certificate", e); } } PdfPKCS7 sgn; try { sgn = new PdfPKCS7(privKey, certChain, crlList, digestAlgorithm, null, false); } catch (InvalidKeyException e) { throw new SignServerException("Error constructing PKCS7 package", e); } catch (NoSuchProviderException e) { throw new SignServerException("Error constructing PKCS7 package", e); } catch (NoSuchAlgorithmException e) { throw new SignServerException("Error constructing PKCS7 package", e); } MessageDigest messageDigest; try { messageDigest = MessageDigest.getInstance(digestAlgorithm); } catch (NoSuchAlgorithmException e) { throw new SignServerException("Error creating " + digestAlgorithm + " digest", e); } Calendar cal = Calendar.getInstance(); // calculate signature size if (contentEstimated == 0) { contentEstimated = calculateEstimatedSignatureSize(certChain, tsc, ocsp, crlList); } byte[] encodedSig = calculateSignature(sgn, contentEstimated, messageDigest, cal, params, certChain, tsc, ocsp, sap); if (LOG.isDebugEnabled()) { LOG.debug("Estimated size: " + contentEstimated); LOG.debug("Encoded length: " + encodedSig.length); } if (contentEstimated + 2 < encodedSig.length) { if (!secondTry) { int contentExact = encodedSig.length; LOG.warn( "Estimated signature size too small, usinging accurate calculation (resulting in an extra signature computation)."); if (LOG.isDebugEnabled()) { LOG.debug("Estimated size: " + contentEstimated + ", actual size: " + contentExact); } // try signing again return addSignatureToPDFDocument(crypto, params, pdfbytes, password, contentExact, request, context); } else { // if we fail to get an accurate signature size on the second attempt, bail out (this shouldn't happen) throw new SignServerException("Failed to calculate signature size"); } } byte[] paddedSig = new byte[contentEstimated]; System.arraycopy(encodedSig, 0, paddedSig, 0, encodedSig.length); PdfDictionary dic2 = new PdfDictionary(); dic2.put(PdfName.CONTENTS, new PdfString(paddedSig).setHexWriting(true)); sap.close(dic2); reader.close(); fout.close(); return fout.toByteArray(); }