nmode's Git Repositories - signal-cli/blob - lib/src/main/java/org/asamk/signal/manager/helper/PreKeyHelper.java

   1 package org.asamk.signal.manager.helper;
   2
   3 import org.asamk.signal.manager.config.ServiceConfig;
   4 import org.asamk.signal.manager.internal.SignalDependencies;
   5 import org.asamk.signal.manager.storage.SignalAccount;
   6 import org.asamk.signal.manager.util.KeyUtils;
   7 import org.signal.libsignal.protocol.IdentityKeyPair;
   8 import org.signal.libsignal.protocol.InvalidKeyIdException;
   9 import org.signal.libsignal.protocol.state.KyberPreKeyRecord;
  10 import org.signal.libsignal.protocol.state.PreKeyRecord;
  11 import org.signal.libsignal.protocol.state.SignedPreKeyRecord;
  12 import org.slf4j.Logger;
  13 import org.slf4j.LoggerFactory;
  14 import org.whispersystems.signalservice.api.account.PreKeyUpload;
  15 import org.whispersystems.signalservice.api.push.ServiceIdType;
  16 import org.whispersystems.signalservice.api.push.exceptions.AuthorizationFailedException;
  17 import org.whispersystems.signalservice.internal.push.OneTimePreKeyCounts;
  18
  19 import java.io.IOException;
  20 import java.util.List;
  21
  22 import static org.asamk.signal.manager.config.ServiceConfig.PREKEY_STALE_AGE;
  23 import static org.asamk.signal.manager.config.ServiceConfig.SIGNED_PREKEY_ROTATE_AGE;
  24
  25 public class PreKeyHelper {
  26
  27     private final static Logger logger = LoggerFactory.getLogger(PreKeyHelper.class);
  28
  29     private final SignalAccount account;
  30     private final SignalDependencies dependencies;
  31
  32     public PreKeyHelper(
  33             final SignalAccount account, final SignalDependencies dependencies
  34     ) {
  35         this.account = account;
  36         this.dependencies = dependencies;
  37     }
  38
  39     public void refreshPreKeysIfNecessary() throws IOException {
  40         refreshPreKeysIfNecessary(ServiceIdType.ACI);
  41         refreshPreKeysIfNecessary(ServiceIdType.PNI);
  42     }
  43
  44     public void refreshPreKeysIfNecessary(ServiceIdType serviceIdType) throws IOException {
  45         final var identityKeyPair = account.getIdentityKeyPair(serviceIdType);
  46         if (identityKeyPair == null) {
  47             return;
  48         }
  49         final var accountId = account.getAccountId(serviceIdType);
  50         if (accountId == null) {
  51             return;
  52         }
  53
  54         OneTimePreKeyCounts preKeyCounts;
  55         try {
  56             preKeyCounts = dependencies.getAccountManager().getPreKeyCounts(serviceIdType);
  57         } catch (AuthorizationFailedException e) {
  58             logger.debug("Failed to get pre key count, ignoring: " + e.getClass().getSimpleName());
  59             preKeyCounts = new OneTimePreKeyCounts(0, 0);
  60         }
  61
  62         SignedPreKeyRecord signedPreKeyRecord = null;
  63         List<PreKeyRecord> preKeyRecords = null;
  64         KyberPreKeyRecord lastResortKyberPreKeyRecord = null;
  65         List<KyberPreKeyRecord> kyberPreKeyRecords = null;
  66
  67         try {
  68             if (preKeyCounts.getEcCount() < ServiceConfig.PREKEY_MINIMUM_COUNT) {
  69                 logger.debug("Refreshing {} ec pre keys, because only {} of min {} pre keys remain",
  70                         serviceIdType,
  71                         preKeyCounts.getEcCount(),
  72                         ServiceConfig.PREKEY_MINIMUM_COUNT);
  73                 preKeyRecords = generatePreKeys(serviceIdType);
  74             }
  75             if (signedPreKeyNeedsRefresh(serviceIdType)) {
  76                 logger.debug("Refreshing {} signed pre key.", serviceIdType);
  77                 signedPreKeyRecord = generateSignedPreKey(serviceIdType, identityKeyPair);
  78             }
  79         } catch (Exception e) {
  80             logger.warn("Failed to store new pre keys, resetting preKey id offset", e);
  81             account.resetPreKeyOffsets(serviceIdType);
  82             preKeyRecords = generatePreKeys(serviceIdType);
  83             signedPreKeyRecord = generateSignedPreKey(serviceIdType, identityKeyPair);
  84         }
  85
  86         try {
  87             if (preKeyCounts.getKyberCount() < ServiceConfig.PREKEY_MINIMUM_COUNT) {
  88                 logger.debug("Refreshing {} kyber pre keys, because only {} of min {} pre keys remain",
  89                         serviceIdType,
  90                         preKeyCounts.getKyberCount(),
  91                         ServiceConfig.PREKEY_MINIMUM_COUNT);
  92                 kyberPreKeyRecords = generateKyberPreKeys(serviceIdType, identityKeyPair);
  93             }
  94             if (lastResortKyberPreKeyNeedsRefresh(serviceIdType)) {
  95                 logger.debug("Refreshing {} last resort kyber pre key.", serviceIdType);
  96                 lastResortKyberPreKeyRecord = generateLastResortKyberPreKey(serviceIdType, identityKeyPair);
  97             }
  98         } catch (Exception e) {
  99             logger.warn("Failed to store new kyber pre keys, resetting preKey id offset", e);
 100             account.resetKyberPreKeyOffsets(serviceIdType);
 101             kyberPreKeyRecords = generateKyberPreKeys(serviceIdType, identityKeyPair);
 102             lastResortKyberPreKeyRecord = generateLastResortKyberPreKey(serviceIdType, identityKeyPair);
 103         }
 104
 105         if (signedPreKeyRecord != null
 106                 || preKeyRecords != null
 107                 || lastResortKyberPreKeyRecord != null
 108                 || kyberPreKeyRecords != null) {
 109             final var preKeyUpload = new PreKeyUpload(serviceIdType,
 110                     identityKeyPair.getPublicKey(),
 111                     signedPreKeyRecord,
 112                     preKeyRecords,
 113                     lastResortKyberPreKeyRecord,
 114                     kyberPreKeyRecords);
 115             try {
 116                 dependencies.getAccountManager().setPreKeys(preKeyUpload);
 117             } catch (AuthorizationFailedException e) {
 118                 // This can happen when the primary device has changed phone number
 119                 logger.warn("Failed to updated pre keys: {}", e.getMessage());
 120             }
 121         }
 122
 123         cleanSignedPreKeys((serviceIdType));
 124         cleanOneTimePreKeys(serviceIdType);
 125     }
 126
 127     private List<PreKeyRecord> generatePreKeys(ServiceIdType serviceIdType) {
 128         final var accountData = account.getAccountData(serviceIdType);
 129         final var offset = accountData.getPreKeyMetadata().getNextPreKeyId();
 130
 131         var records = KeyUtils.generatePreKeyRecords(offset);
 132         account.addPreKeys(serviceIdType, records);
 133
 134         return records;
 135     }
 136
 137     private boolean signedPreKeyNeedsRefresh(ServiceIdType serviceIdType) {
 138         final var accountData = account.getAccountData(serviceIdType);
 139
 140         final var activeSignedPreKeyId = accountData.getPreKeyMetadata().getActiveSignedPreKeyId();
 141         if (activeSignedPreKeyId == -1) {
 142             return true;
 143         }
 144         try {
 145             final var signedPreKeyRecord = accountData.getSignedPreKeyStore().loadSignedPreKey(activeSignedPreKeyId);
 146             return signedPreKeyRecord.getTimestamp() < System.currentTimeMillis() - SIGNED_PREKEY_ROTATE_AGE;
 147         } catch (InvalidKeyIdException e) {
 148             return true;
 149         }
 150     }
 151
 152     private SignedPreKeyRecord generateSignedPreKey(ServiceIdType serviceIdType, IdentityKeyPair identityKeyPair) {
 153         final var accountData = account.getAccountData(serviceIdType);
 154         final var signedPreKeyId = accountData.getPreKeyMetadata().getNextSignedPreKeyId();
 155
 156         var record = KeyUtils.generateSignedPreKeyRecord(signedPreKeyId, identityKeyPair.getPrivateKey());
 157         account.addSignedPreKey(serviceIdType, record);
 158
 159         return record;
 160     }
 161
 162     private List<KyberPreKeyRecord> generateKyberPreKeys(
 163             ServiceIdType serviceIdType, final IdentityKeyPair identityKeyPair
 164     ) {
 165         final var accountData = account.getAccountData(serviceIdType);
 166         final var offset = accountData.getPreKeyMetadata().getNextKyberPreKeyId();
 167
 168         var records = KeyUtils.generateKyberPreKeyRecords(offset, identityKeyPair.getPrivateKey());
 169         account.addKyberPreKeys(serviceIdType, records);
 170
 171         return records;
 172     }
 173
 174     private boolean lastResortKyberPreKeyNeedsRefresh(ServiceIdType serviceIdType) {
 175         final var accountData = account.getAccountData(serviceIdType);
 176
 177         final var activeLastResortKyberPreKeyId = accountData.getPreKeyMetadata().getActiveLastResortKyberPreKeyId();
 178         if (activeLastResortKyberPreKeyId == -1) {
 179             return true;
 180         }
 181         try {
 182             final var kyberPreKeyRecord = accountData.getKyberPreKeyStore()
 183                     .loadKyberPreKey(activeLastResortKyberPreKeyId);
 184             return kyberPreKeyRecord.getTimestamp() < System.currentTimeMillis() - SIGNED_PREKEY_ROTATE_AGE;
 185         } catch (InvalidKeyIdException e) {
 186             return true;
 187         }
 188     }
 189
 190     private KyberPreKeyRecord generateLastResortKyberPreKey(
 191             ServiceIdType serviceIdType, IdentityKeyPair identityKeyPair
 192     ) {
 193         final var accountData = account.getAccountData(serviceIdType);
 194         final var signedPreKeyId = accountData.getPreKeyMetadata().getNextKyberPreKeyId();
 195
 196         var record = KeyUtils.generateKyberPreKeyRecord(signedPreKeyId, identityKeyPair.getPrivateKey());
 197         account.addLastResortKyberPreKey(serviceIdType, record);
 198
 199         return record;
 200     }
 201
 202     private void cleanSignedPreKeys(ServiceIdType serviceIdType) {
 203         final var accountData = account.getAccountData(serviceIdType);
 204
 205         final var activeSignedPreKeyId = accountData.getPreKeyMetadata().getActiveSignedPreKeyId();
 206         accountData.getSignedPreKeyStore().removeOldSignedPreKeys(activeSignedPreKeyId);
 207
 208         final var activeLastResortKyberPreKeyId = accountData.getPreKeyMetadata().getActiveLastResortKyberPreKeyId();
 209         accountData.getKyberPreKeyStore().removeOldLastResortKyberPreKeys(activeLastResortKyberPreKeyId);
 210     }
 211
 212     private void cleanOneTimePreKeys(ServiceIdType serviceIdType) {
 213         long threshold = System.currentTimeMillis() - PREKEY_STALE_AGE;
 214         int minCount = 200;
 215
 216         final var accountData = account.getAccountData(serviceIdType);
 217         accountData.getPreKeyStore().deleteAllStaleOneTimeEcPreKeys(threshold, minCount);
 218         accountData.getKyberPreKeyStore().deleteAllStaleOneTimeKyberPreKeys(threshold, minCount);
 219     }
 220 }