1 | package org.expeditee.auth;
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2 |
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3 | import java.io.BufferedReader;
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4 | import java.io.FileInputStream;
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5 | import java.io.FileReader;
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6 | import java.io.IOException;
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7 | import java.io.InputStreamReader;
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8 | import java.io.Reader;
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9 | import java.io.UnsupportedEncodingException;
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10 | import java.security.InvalidKeyException;
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11 | import java.security.NoSuchAlgorithmException;
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12 | import java.util.Arrays;
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13 | import java.util.Base64;
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14 | import java.util.List;
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15 | import java.util.stream.Collectors;
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16 |
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17 | import javax.crypto.BadPaddingException;
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18 | import javax.crypto.Cipher;
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19 | import javax.crypto.IllegalBlockSizeException;
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20 | import javax.crypto.NoSuchPaddingException;
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21 | import javax.crypto.SecretKey;
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22 | import javax.crypto.spec.SecretKeySpec;
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23 |
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24 | import org.expeditee.gui.Frame;
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25 | import org.expeditee.io.ExpReader;
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26 | import org.expeditee.items.Text;
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27 | import org.expeditee.settings.auth.secrets.KeyList;
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28 | import org.ngikm.Util.ThrowingFunction;
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29 | import org.ngikm.cryptography.CryptographyConstants;
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30 |
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31 | public class EncryptedExpReader extends ExpReader implements CryptographyConstants {
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32 | static final String ENCRYPTED_EXP_FLAG = "EncryptedExp";
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33 | private SecretKey personalKey;
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34 | private List<SecretKey> multiKey;
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35 | private boolean accessDenied = false;
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36 | private boolean usePersonalKey;
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37 |
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38 | public EncryptedExpReader(final String frameName, final boolean usePersonalKey) throws UnsupportedEncodingException {
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39 | super(frameName);
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40 | this.usePersonalKey = usePersonalKey;
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41 | }
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42 |
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43 | public static boolean isEncryptedExpediteeFile(final String path) throws IOException {
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44 | final BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(path), "UTF-8"));
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45 | final String firstLine = in.readLine();
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46 | in.close();
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47 | return firstLine.startsWith(ENCRYPTED_EXP_FLAG);
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48 | }
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49 |
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50 | public int getVersionEnc(String fullpath) {
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51 | try {
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52 | BufferedReader reader;
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53 | if (usePersonalKey) {
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54 | reader = new EncryptedProfileLineReader(new BufferedReader(new FileReader(fullpath)));
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55 | } else {
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56 | reader = new EncryptedLineReader(new BufferedReader(new FileReader(fullpath)));
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57 | }
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58 | String next = "";
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59 | // First read the header lines until we get the version number
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60 | while (reader.ready() && !(next = reader.readLine()).equals("Z")) {
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61 | if (isValidLine(next)) {
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62 | Character tag = getTag(next);
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63 | String value = getValue(next);
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64 | if (tag.equals('V')) {
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65 | reader.close();
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66 | return Integer.parseInt(value);
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67 | }
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68 | }
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69 | }
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70 | reader.close();
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71 | } catch (Exception e) {
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72 | }
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73 | return -1;
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74 | }
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75 |
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76 | @Override
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77 | public Frame readFrame(final String fullPath) throws IOException {
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78 | final Reader in = new InputStreamReader(new FileInputStream(fullPath), "UTF-8");
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79 | if (usePersonalKey) {
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80 | return readFrame(new EncryptedProfileLineReader(new BufferedReader(in)));
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81 | } else {
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82 | return readFrame(new EncryptedLineReader(new BufferedReader(in)));
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83 | }
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84 | }
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85 |
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86 | @Override
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87 | public Frame readFrame(final BufferedReader reader) throws IOException {
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88 | if (accessDenied) { return null; }
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89 | else return super.readFrame(reader);
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90 | }
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91 |
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92 | private static byte[] DecryptSymmetric(final byte[] toDecrypt, final SecretKey key) {
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93 | try {
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94 | final Cipher cipher = Cipher.getInstance(SymmetricAlgorithm + SymmetricAlgorithmParameters);
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95 | cipher.init(Cipher.DECRYPT_MODE, key);
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96 | final byte[] decryptedBytes = cipher.doFinal(toDecrypt);
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97 | int indexOfZero = decryptedBytes.length - 1;
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98 | for (int i = decryptedBytes.length - 1; i >= 0; i--) {
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99 | if (decryptedBytes[i] != (byte) 0) {
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100 | indexOfZero = i + 1;
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101 | break;
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102 | }
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103 | }
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104 | if (indexOfZero < 0) { return decryptedBytes; }
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105 | else { return Arrays.copyOf(decryptedBytes, indexOfZero); }
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106 | } catch (final NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException
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107 | | IllegalBlockSizeException | BadPaddingException e) {
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108 | e.printStackTrace();
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109 | return null;
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110 | }
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111 | }
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112 |
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113 | private class EncryptedProfileLineReader extends BufferedReader {
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114 |
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115 | public EncryptedProfileLineReader(final Reader in) {
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116 | super(in);
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117 | }
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118 |
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119 | @Override
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120 | /**
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121 | * Reads a line from an encrypted exp file that uses profile encryption (single key; personal key)
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122 | * Returns that line to process, null if the currently logged in users personal key is not the appropriate one (access denied).
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123 | */
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124 | public String readLine() throws IOException {
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125 | // read encrypted line
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126 | final String line = super.readLine();
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127 |
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128 | if (line.isEmpty()) { return ""; }
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129 | if (line.startsWith(ENCRYPTED_EXP_FLAG)) {
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130 | // record/overwrite previous personal key then ignore this line by recursing
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131 | final Text text = KeyList.PersonalKey.get();
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132 | final byte[] keyBytes = Base64.getDecoder().decode(text.getData().get(0));
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133 | personalKey = new SecretKeySpec(keyBytes, SymmetricAlgorithm);
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134 | return readLine();
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135 | }
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136 |
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137 | // decrypt line and return result
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138 | final byte[] toDecrypt = Base64.getDecoder().decode(line);
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139 | final byte[] decrypted = DecryptSymmetric(toDecrypt, personalKey);
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140 | if (decrypted == null) {
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141 | accessDenied = true;
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142 | return null; // access denied
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143 | } else {
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144 | final String decryptedLine = new String(decrypted);
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145 | if (decryptedLine.startsWith("Z")) { return decryptedLine.trim(); }
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146 | else { return decryptedLine; }
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147 | }
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148 | }
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149 | }
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150 |
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151 | private class EncryptedLineReader extends BufferedReader {
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152 |
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153 | public EncryptedLineReader(final Reader in) {
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154 | super(in);
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155 | }
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156 |
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157 | @Override
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158 | /**
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159 | * Reads a line from an encrypted exp file that uses (potentially multiple) labeled keys
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160 | * Returns that line to process, null if the ...
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161 | */
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162 | public String readLine() throws IOException {
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163 | // read encrypted line
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164 | final String line = super.readLine();
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165 |
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166 | if (line.isEmpty()) { return ""; }
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167 | if (line.startsWith(ENCRYPTED_EXP_FLAG)) {
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168 | // resolve labels to secret keys
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169 | final List<String> labels = Arrays.asList(line.split(" ")).stream().skip(1).collect(Collectors.toList());
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170 | final ThrowingFunction<String, SecretKey, Exception> worker = new ThrowingFunction<String, SecretKey, Exception>() {
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171 | @Override
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172 | public SecretKey applyThrows(final String label) throws Exception {
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173 | return Authenticator.getInstance().getSecretKey(label, System.getProperty("password"));
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174 | }
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175 | };
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176 | multiKey = labels.stream().map(l -> {
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177 | try {
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178 | return worker.apply(l);
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179 | } catch (final Exception e) {
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180 | return null;
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181 | }
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182 | }).collect(Collectors.toList());
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183 |
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184 | // confirm you have all the keys necessary for decryption
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185 | if (multiKey.contains(null)) {
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186 | return null;
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187 | }
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188 |
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189 | // move onto the next line
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190 | return readLine();
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191 | }
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192 |
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193 | // decrypt line and return result
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194 | final byte[] toDecrypt = Base64.getDecoder().decode(line);
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195 | byte[] decryptedBytes = null;
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196 | for (final SecretKey key: multiKey) {
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197 | decryptedBytes = DecryptSymmetric(toDecrypt, key);
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198 | if (decryptedBytes == null) { return null; }
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199 | }
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200 | final String decrypted = new String(decryptedBytes);
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201 | if (decrypted.startsWith("Z")) { return decrypted.trim(); }
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202 | else { return decrypted; }
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203 | }
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204 | }
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205 | }
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