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

   1 package org.asamk.signal.manager.util;
   2
   3 import org.asamk.signal.manager.api.Pair;
   4 import org.asamk.signal.manager.api.Profile;
   5 import org.signal.libsignal.protocol.IdentityKey;
   6 import org.signal.libsignal.protocol.InvalidKeyException;
   7 import org.signal.libsignal.protocol.ecc.ECPublicKey;
   8 import org.signal.libsignal.zkgroup.profiles.ProfileKey;
   9 import org.slf4j.Logger;
  10 import org.slf4j.LoggerFactory;
  11 import org.whispersystems.signalservice.api.crypto.InvalidCiphertextException;
  12 import org.whispersystems.signalservice.api.crypto.ProfileCipher;
  13 import org.whispersystems.signalservice.api.profiles.SignalServiceProfile;
  14 import org.whispersystems.signalservice.internal.push.PaymentAddress;
  15
  16 import java.io.IOException;
  17 import java.util.Base64;
  18 import java.util.HashSet;
  19
  20 public class ProfileUtils {
  21
  22     private static final Logger logger = LoggerFactory.getLogger(ProfileUtils.class);
  23
  24     public static Profile decryptProfile(
  25             final ProfileKey profileKey, final SignalServiceProfile encryptedProfile
  26     ) {
  27         var profileCipher = new ProfileCipher(profileKey);
  28         IdentityKey identityKey = null;
  29         try {
  30             identityKey = new IdentityKey(Base64.getDecoder().decode(encryptedProfile.getIdentityKey()), 0);
  31         } catch (InvalidKeyException e) {
  32             logger.debug("Failed to decode identity key in profile, can't verify payment address", e);
  33         }
  34
  35         try {
  36             var name = decrypt(encryptedProfile.getName(), profileCipher);
  37             var about = trimZeros(decrypt(encryptedProfile.getAbout(), profileCipher));
  38             var aboutEmoji = trimZeros(decrypt(encryptedProfile.getAboutEmoji(), profileCipher));
  39
  40             final var nameParts = splitName(name);
  41             return new Profile(System.currentTimeMillis(),
  42                     nameParts.first(),
  43                     nameParts.second(),
  44                     about,
  45                     aboutEmoji,
  46                     encryptedProfile.getAvatar(),
  47                     identityKey == null || encryptedProfile.getPaymentAddress() == null
  48                             ? null
  49                             : decryptAndVerifyMobileCoinAddress(encryptedProfile.getPaymentAddress(),
  50                                     profileCipher,
  51                                     identityKey.getPublicKey()),
  52                     getUnidentifiedAccessMode(encryptedProfile, profileCipher),
  53                     getCapabilities(encryptedProfile));
  54         } catch (InvalidCiphertextException e) {
  55             logger.debug("Failed to decrypt profile for {}", encryptedProfile.getServiceId(), e);
  56             return null;
  57         }
  58     }
  59
  60     public static Profile.UnidentifiedAccessMode getUnidentifiedAccessMode(
  61             final SignalServiceProfile encryptedProfile, final ProfileCipher profileCipher
  62     ) {
  63         if (encryptedProfile.isUnrestrictedUnidentifiedAccess()) {
  64             return Profile.UnidentifiedAccessMode.UNRESTRICTED;
  65         }
  66
  67         if (encryptedProfile.getUnidentifiedAccess() != null && profileCipher != null) {
  68             final var unidentifiedAccessVerifier = Base64.getDecoder().decode(encryptedProfile.getUnidentifiedAccess());
  69             if (profileCipher.verifyUnidentifiedAccess(unidentifiedAccessVerifier)) {
  70                 return Profile.UnidentifiedAccessMode.ENABLED;
  71             }
  72         }
  73
  74         return Profile.UnidentifiedAccessMode.DISABLED;
  75     }
  76
  77     public static HashSet<Profile.Capability> getCapabilities(final SignalServiceProfile encryptedProfile) {
  78         final var capabilities = new HashSet<Profile.Capability>();
  79         if (encryptedProfile.getCapabilities().isStorage()) {
  80             capabilities.add(Profile.Capability.storage);
  81         }
  82
  83         return capabilities;
  84     }
  85
  86     private static String decrypt(
  87             final String encryptedName, final ProfileCipher profileCipher
  88     ) throws InvalidCiphertextException {
  89         try {
  90             return encryptedName == null
  91                     ? null
  92                     : new String(profileCipher.decrypt(Base64.getDecoder().decode(encryptedName)));
  93         } catch (IllegalArgumentException e) {
  94             return null;
  95         }
  96     }
  97
  98     private static byte[] decryptAndVerifyMobileCoinAddress(
  99             final byte[] encryptedPaymentAddress, final ProfileCipher profileCipher, final ECPublicKey publicKey
 100     ) throws InvalidCiphertextException {
 101         byte[] decrypted;
 102         try {
 103             decrypted = profileCipher.decryptWithLength(encryptedPaymentAddress);
 104         } catch (IOException e) {
 105             logger.debug("Failed to decrypt payment address", e);
 106             return null;
 107         }
 108
 109         PaymentAddress paymentAddress;
 110         try {
 111             paymentAddress = PaymentAddress.ADAPTER.decode(decrypted);
 112         } catch (IOException e) {
 113             logger.debug("Failed to parse payment address", e);
 114             return null;
 115         }
 116
 117         return PaymentUtils.verifyPaymentsAddress(paymentAddress, publicKey);
 118     }
 119
 120     private static Pair<String, String> splitName(String name) {
 121         if (name == null) {
 122             return new Pair<>(null, null);
 123         }
 124         String[] parts = name.split("\0");
 125
 126         return switch (parts.length) {
 127             case 0 -> new Pair<>(null, null);
 128             case 1 -> new Pair<>(parts[0], null);
 129             default -> new Pair<>(parts[0], parts[1]);
 130         };
 131     }
 132
 133     static String trimZeros(String str) {
 134         if (str == null) {
 135             return null;
 136         }
 137
 138         int pos = str.indexOf(0);
 139         return pos == -1 ? str : str.substring(0, pos);
 140     }
 141 }