src/com/owncloud/android/ui/adapter/X509CertificateViewAdapter.java

   1 /**
   2  *   ownCloud Android client application
   3  *
   4  *   @author masensio
   5  *   @author David A. Velasco
   6  *   Copyright (C) 2015 ownCloud Inc.
   7  *
   8  *   This program is free software: you can redistribute it and/or modify
   9  *   it under the terms of the GNU General Public License version 2,
  10  *   as published by the Free Software Foundation.
  11  *
  12  *   This program is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  *
  20  */
  21 package com.owncloud.android.ui.adapter;
  22
  23 import java.security.MessageDigest;
  24 import java.security.NoSuchAlgorithmException;
  25 import java.security.cert.CertificateEncodingException;
  26 import java.security.cert.X509Certificate;
  27 import java.text.DateFormat;
  28 import java.util.Date;
  29 import java.util.HashMap;
  30 import java.util.Map;
  31
  32 import javax.security.auth.x500.X500Principal;
  33
  34 import com.owncloud.android.R;
  35 import com.owncloud.android.ui.dialog.SslUntrustedCertDialog;
  36
  37 import android.util.Log;
  38 import android.view.View;
  39 import android.widget.TextView;
  40
  41 /**
  42  *
  43  */
  44 public class X509CertificateViewAdapter implements SslUntrustedCertDialog.CertificateViewAdapter {
  45
  46     //private final static String TAG = X509CertificateViewAdapter.class.getSimpleName();
  47
  48     private X509Certificate mCertificate = null;
  49
  50     private static final String TAG = X509CertificateViewAdapter.class.getSimpleName();
  51
  52     public X509CertificateViewAdapter(X509Certificate certificate) {
  53         mCertificate = certificate;
  54     }
  55
  56     @Override
  57     public void updateCertificateView(View dialogView) {
  58         TextView nullCerView = (TextView) dialogView.findViewById(R.id.null_cert);
  59
  60         if (mCertificate != null) {
  61             nullCerView.setVisibility(View.GONE);
  62             showSubject(mCertificate.getSubjectX500Principal(), dialogView);
  63             showIssuer(mCertificate.getIssuerX500Principal(), dialogView);
  64             showValidity(mCertificate.getNotBefore(), mCertificate.getNotAfter(), dialogView);
  65             showSignature(dialogView);
  66
  67         } else {
  68             nullCerView.setVisibility(View.VISIBLE);
  69         }
  70     }
  71
  72     private byte[] getDigest(String algorithm, byte[] message) {
  73         MessageDigest md = null;
  74
  75         try {
  76             md = MessageDigest.getInstance(algorithm);
  77         } catch (NoSuchAlgorithmException e) {
  78             return null;
  79         }
  80         md.reset();
  81         return md.digest(message);
  82     }
  83
  84     private void showSignature(View dialogView) {
  85         byte[] cert = null;
  86
  87         TextView certFingerprintView = ((TextView) dialogView.findViewById(R.id.value_certificate_fingerprint));
  88         TextView algorithmView = ((TextView) dialogView.findViewById(R.id.value_signature_algorithm));
  89
  90         try {
  91             cert = mCertificate.getEncoded();
  92             if (cert == null) {
  93
  94                 certFingerprintView.setText(R.string.certificate_load_problem);
  95                 algorithmView.setText(R.string.certificate_load_problem);
  96
  97             } else {
  98
  99                 certFingerprintView.setText(
 100                         getDigestHexBytesWithColonsAndNewLines(dialogView, "SHA-256", cert)
 101                                 + getDigestHexBytesWithColonsAndNewLines(dialogView, "SHA-1", cert)
 102                                 + getDigestHexBytesWithColonsAndNewLines(dialogView, "MD5", cert));
 103                 algorithmView.setText(mCertificate.getSigAlgName());
 104
 105             }
 106
 107         } catch (CertificateEncodingException e) {
 108             Log.e(TAG, "Problem while trying to decode the certificate.");
 109         }
 110
 111
 112     }
 113
 114     private final String getDigestHexBytesWithColonsAndNewLines(View dialogView, final String digestType, final byte [] cert) {
 115         final byte[] rawDigest;
 116         final String newLine = System.getProperty("line.separator");
 117
 118         rawDigest = getDigest(digestType, cert);
 119
 120         if ( rawDigest == null) {
 121             return digestType + ":" + newLine + dialogView.getContext().getString(R.string.digest_algorithm_not_available) + newLine + newLine;
 122         }
 123
 124         final StringBuilder hex = new StringBuilder(3 * rawDigest.length);
 125
 126         for (final byte b : rawDigest) {
 127            final int hiVal = (b & 0xF0) >> 4;
 128            final int loVal = b & 0x0F;
 129            hex.append((char) ('0' + (hiVal + (hiVal / 10 * 7))));
 130            hex.append((char) ('0' + (loVal + (loVal / 10 * 7))));
 131            hex.append(":");
 132         }
 133         return digestType + ":" + newLine + hex.toString().replaceFirst("\\:$","") + newLine + newLine;
 134      }
 135
 136     private void showValidity(Date notBefore, Date notAfter, View dialogView) {
 137         TextView fromView = ((TextView)dialogView.findViewById(R.id.value_validity_from));
 138         TextView toView = ((TextView)dialogView.findViewById(R.id.value_validity_to));
 139         DateFormat dateFormat = DateFormat.getDateInstance();
 140         fromView.setText(dateFormat.format(notBefore));
 141         toView.setText(dateFormat.format(notAfter));
 142     }
 143
 144     private void showSubject(X500Principal subject, View dialogView) {
 145         Map<String, String> s = parsePrincipal(subject);
 146         TextView cnView = ((TextView)dialogView.findViewById(R.id.value_subject_CN));
 147         TextView oView = ((TextView)dialogView.findViewById(R.id.value_subject_O));
 148         TextView ouView = ((TextView)dialogView.findViewById(R.id.value_subject_OU));
 149         TextView cView = ((TextView)dialogView.findViewById(R.id.value_subject_C));
 150         TextView stView = ((TextView)dialogView.findViewById(R.id.value_subject_ST));
 151         TextView lView = ((TextView)dialogView.findViewById(R.id.value_subject_L));
 152
 153         if (s.get("CN") != null) {
 154             cnView.setText(s.get("CN"));
 155             cnView.setVisibility(View.VISIBLE);
 156         } else {
 157             cnView.setVisibility(View.GONE);
 158         }
 159         if (s.get("O") != null) {
 160             oView.setText(s.get("O"));
 161             oView.setVisibility(View.VISIBLE);
 162         } else {
 163             oView.setVisibility(View.GONE);
 164         }
 165         if (s.get("OU") != null) {
 166             ouView.setText(s.get("OU"));
 167             ouView.setVisibility(View.VISIBLE);
 168         } else {
 169             ouView.setVisibility(View.GONE);
 170         }
 171         if (s.get("C") != null) {
 172             cView.setText(s.get("C"));
 173             cView.setVisibility(View.VISIBLE);
 174         } else {
 175             cView.setVisibility(View.GONE);
 176         }
 177         if (s.get("ST") != null) {
 178             stView.setText(s.get("ST"));
 179             stView.setVisibility(View.VISIBLE);
 180         } else {
 181             stView.setVisibility(View.GONE);
 182         }
 183         if (s.get("L") != null) {
 184             lView.setText(s.get("L"));
 185             lView.setVisibility(View.VISIBLE);
 186         } else {
 187             lView.setVisibility(View.GONE);
 188         }
 189     }
 190
 191     private void showIssuer(X500Principal issuer, View dialogView) {
 192         Map<String, String> s = parsePrincipal(issuer);
 193         TextView cnView = ((TextView)dialogView.findViewById(R.id.value_issuer_CN));
 194         TextView oView = ((TextView)dialogView.findViewById(R.id.value_issuer_O));
 195         TextView ouView = ((TextView)dialogView.findViewById(R.id.value_issuer_OU));
 196         TextView cView = ((TextView)dialogView.findViewById(R.id.value_issuer_C));
 197         TextView stView = ((TextView)dialogView.findViewById(R.id.value_issuer_ST));
 198         TextView lView = ((TextView)dialogView.findViewById(R.id.value_issuer_L));
 199
 200         if (s.get("CN") != null) {
 201             cnView.setText(s.get("CN"));
 202             cnView.setVisibility(View.VISIBLE);
 203         } else {
 204             cnView.setVisibility(View.GONE);
 205         }
 206         if (s.get("O") != null) {
 207             oView.setText(s.get("O"));
 208             oView.setVisibility(View.VISIBLE);
 209         } else {
 210             oView.setVisibility(View.GONE);
 211         }
 212         if (s.get("OU") != null) {
 213             ouView.setText(s.get("OU"));
 214             ouView.setVisibility(View.VISIBLE);
 215         } else {
 216             ouView.setVisibility(View.GONE);
 217         }
 218         if (s.get("C") != null) {
 219             cView.setText(s.get("C"));
 220             cView.setVisibility(View.VISIBLE);
 221         } else {
 222             cView.setVisibility(View.GONE);
 223         }
 224         if (s.get("ST") != null) {
 225             stView.setText(s.get("ST"));
 226             stView.setVisibility(View.VISIBLE);
 227         } else {
 228             stView.setVisibility(View.GONE);
 229         }
 230         if (s.get("L") != null) {
 231             lView.setText(s.get("L"));
 232             lView.setVisibility(View.VISIBLE);
 233         } else {
 234             lView.setVisibility(View.GONE);
 235         }
 236     }
 237
 238
 239     private Map<String, String> parsePrincipal(X500Principal principal) {
 240         Map<String, String> result = new HashMap<String, String>();
 241         String toParse = principal.getName();
 242         String[] pieces = toParse.split(",");
 243         String[] tokens = {"CN", "O", "OU", "C", "ST", "L"};
 244         for (int i=0; i < pieces.length ; i++) {
 245             for (int j=0; j<tokens.length; j++) {
 246                 if (pieces[i].startsWith(tokens[j] + "=")) {
 247                     result.put(tokens[j], pieces[i].substring(tokens[j].length()+1));
 248                 }
 249             }
 250         }
 251         return result;
 252     }
 253
 254 }