nmode's Git Repositories - signal-cli/blob - src/main/java/org/asamk/signal/storage/protocol/JsonIdentityKeyStore.java

   1 package org.asamk.signal.storage.protocol;
   2
   3 import com.fasterxml.jackson.core.JsonGenerator;
   4 import com.fasterxml.jackson.core.JsonParser;
   5 import com.fasterxml.jackson.core.JsonProcessingException;
   6 import com.fasterxml.jackson.databind.*;
   7 import org.asamk.signal.TrustLevel;
   8 import org.whispersystems.libsignal.IdentityKey;
   9 import org.whispersystems.libsignal.IdentityKeyPair;
  10 import org.whispersystems.libsignal.InvalidKeyException;
  11 import org.whispersystems.libsignal.SignalProtocolAddress;
  12 import org.whispersystems.libsignal.state.IdentityKeyStore;
  13 import org.whispersystems.signalservice.internal.util.Base64;
  14
  15 import java.io.IOException;
  16 import java.util.*;
  17
  18 public class JsonIdentityKeyStore implements IdentityKeyStore {
  19
  20     private final Map<String, List<Identity>> trustedKeys = new HashMap<>();
  21
  22     private final IdentityKeyPair identityKeyPair;
  23     private final int localRegistrationId;
  24
  25
  26     public JsonIdentityKeyStore(IdentityKeyPair identityKeyPair, int localRegistrationId) {
  27         this.identityKeyPair = identityKeyPair;
  28         this.localRegistrationId = localRegistrationId;
  29     }
  30
  31     @Override
  32     public IdentityKeyPair getIdentityKeyPair() {
  33         return identityKeyPair;
  34     }
  35
  36     @Override
  37     public int getLocalRegistrationId() {
  38         return localRegistrationId;
  39     }
  40
  41     @Override
  42     public boolean saveIdentity(SignalProtocolAddress address, IdentityKey identityKey) {
  43         return saveIdentity(address.getName(), identityKey, TrustLevel.TRUSTED_UNVERIFIED, null);
  44     }
  45
  46     /**
  47      * Adds or updates the given identityKey for the user name and sets the trustLevel and added timestamp.
  48      *
  49      * @param name        User name, i.e. phone number
  50      * @param identityKey The user's public key
  51      * @param trustLevel
  52      * @param added       Added timestamp, if null and the key is newly added, the current time is used.
  53      */
  54     public boolean saveIdentity(String name, IdentityKey identityKey, TrustLevel trustLevel, Date added) {
  55         List<Identity> identities = trustedKeys.get(name);
  56         if (identities == null) {
  57             identities = new ArrayList<>();
  58             trustedKeys.put(name, identities);
  59         } else {
  60             for (Identity id : identities) {
  61                 if (!id.identityKey.equals(identityKey))
  62                     continue;
  63
  64                 if (id.trustLevel.compareTo(trustLevel) < 0) {
  65                     id.trustLevel = trustLevel;
  66                 }
  67                 if (added != null) {
  68                     id.added = added;
  69                 }
  70                 return true;
  71             }
  72         }
  73         identities.add(new Identity(identityKey, trustLevel, added != null ? added : new Date()));
  74         return false;
  75     }
  76
  77     @Override
  78     public boolean isTrustedIdentity(SignalProtocolAddress address, IdentityKey identityKey, Direction direction) {
  79         // TODO implement possibility for different handling of incoming/outgoing trust decisions
  80         List<Identity> identities = trustedKeys.get(address.getName());
  81         if (identities == null) {
  82             // Trust on first use
  83             return true;
  84         }
  85
  86         for (Identity id : identities) {
  87             if (id.identityKey.equals(identityKey)) {
  88                 return id.isTrusted();
  89             }
  90         }
  91
  92         return false;
  93     }
  94
  95     public Map<String, List<Identity>> getIdentities() {
  96         // TODO deep copy
  97         return trustedKeys;
  98     }
  99
 100     public List<Identity> getIdentities(String name) {
 101         // TODO deep copy
 102         return trustedKeys.get(name);
 103     }
 104
 105     public static class JsonIdentityKeyStoreDeserializer extends JsonDeserializer<JsonIdentityKeyStore> {
 106
 107         @Override
 108         public JsonIdentityKeyStore deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
 109             JsonNode node = jsonParser.getCodec().readTree(jsonParser);
 110
 111             try {
 112                 int localRegistrationId = node.get("registrationId").asInt();
 113                 IdentityKeyPair identityKeyPair = new IdentityKeyPair(Base64.decode(node.get("identityKey").asText()));
 114
 115
 116                 JsonIdentityKeyStore keyStore = new JsonIdentityKeyStore(identityKeyPair, localRegistrationId);
 117
 118                 JsonNode trustedKeysNode = node.get("trustedKeys");
 119                 if (trustedKeysNode.isArray()) {
 120                     for (JsonNode trustedKey : trustedKeysNode) {
 121                         String trustedKeyName = trustedKey.get("name").asText();
 122                         try {
 123                             IdentityKey id = new IdentityKey(Base64.decode(trustedKey.get("identityKey").asText()), 0);
 124                             TrustLevel trustLevel = trustedKey.has("trustLevel") ? TrustLevel.fromInt(trustedKey.get("trustLevel").asInt()) : TrustLevel.TRUSTED_UNVERIFIED;
 125                             Date added = trustedKey.has("addedTimestamp") ? new Date(trustedKey.get("addedTimestamp").asLong()) : new Date();
 126                             keyStore.saveIdentity(trustedKeyName, id, trustLevel, added);
 127                         } catch (InvalidKeyException | IOException e) {
 128                             System.out.println(String.format("Error while decoding key for: %s", trustedKeyName));
 129                         }
 130                     }
 131                 }
 132
 133                 return keyStore;
 134             } catch (InvalidKeyException e) {
 135                 throw new IOException(e);
 136             }
 137         }
 138     }
 139
 140     public static class JsonIdentityKeyStoreSerializer extends JsonSerializer<JsonIdentityKeyStore> {
 141
 142         @Override
 143         public void serialize(JsonIdentityKeyStore jsonIdentityKeyStore, JsonGenerator json, SerializerProvider serializerProvider) throws IOException, JsonProcessingException {
 144             json.writeStartObject();
 145             json.writeNumberField("registrationId", jsonIdentityKeyStore.getLocalRegistrationId());
 146             json.writeStringField("identityKey", Base64.encodeBytes(jsonIdentityKeyStore.getIdentityKeyPair().serialize()));
 147             json.writeArrayFieldStart("trustedKeys");
 148             for (Map.Entry<String, List<Identity>> trustedKey : jsonIdentityKeyStore.trustedKeys.entrySet()) {
 149                 for (Identity id : trustedKey.getValue()) {
 150                     json.writeStartObject();
 151                     json.writeStringField("name", trustedKey.getKey());
 152                     json.writeStringField("identityKey", Base64.encodeBytes(id.identityKey.serialize()));
 153                     json.writeNumberField("trustLevel", id.trustLevel.ordinal());
 154                     json.writeNumberField("addedTimestamp", id.added.getTime());
 155                     json.writeEndObject();
 156                 }
 157             }
 158             json.writeEndArray();
 159             json.writeEndObject();
 160         }
 161     }
 162
 163     public class Identity {
 164         IdentityKey identityKey;
 165         TrustLevel trustLevel;
 166         Date added;
 167
 168         public Identity(IdentityKey identityKey, TrustLevel trustLevel) {
 169             this.identityKey = identityKey;
 170             this.trustLevel = trustLevel;
 171             this.added = new Date();
 172         }
 173
 174         public Identity(IdentityKey identityKey, TrustLevel trustLevel, Date added) {
 175             this.identityKey = identityKey;
 176             this.trustLevel = trustLevel;
 177             this.added = added;
 178         }
 179
 180         public boolean isTrusted() {
 181             return trustLevel == TrustLevel.TRUSTED_UNVERIFIED ||
 182                     trustLevel == TrustLevel.TRUSTED_VERIFIED;
 183         }
 184
 185         public IdentityKey getIdentityKey() {
 186             return this.identityKey;
 187         }
 188
 189         public TrustLevel getTrustLevel() {
 190             return this.trustLevel;
 191         }
 192
 193         public Date getDateAdded() {
 194             return this.added;
 195         }
 196
 197         public byte[] getFingerprint() {
 198             return identityKey.getPublicKey().serialize();
 199         }
 200     }
 201 }