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 com.google.protobuf.InvalidProtocolBufferException;
   4
   5 import org.asamk.signal.manager.api.Pair;
   6 import org.asamk.signal.manager.storage.recipients.Profile;
   7 import org.signal.libsignal.protocol.IdentityKey;
   8 import org.signal.libsignal.protocol.InvalidKeyException;
   9 import org.signal.libsignal.protocol.ecc.ECPublicKey;
  10 import org.signal.libsignal.zkgroup.profiles.ProfileKey;
  11 import org.slf4j.Logger;
  12 import org.slf4j.LoggerFactory;
  13 import org.whispersystems.signalservice.api.crypto.InvalidCiphertextException;
  14 import org.whispersystems.signalservice.api.crypto.ProfileCipher;
  15 import org.whispersystems.signalservice.api.profiles.SignalServiceProfile;
  16 import org.whispersystems.signalservice.internal.push.SignalServiceProtos;
  17
  18 import java.io.IOException;
  19 import java.util.Base64;
  20 import java.util.HashSet;
  21
  22 public class ProfileUtils {
  23
  24     private final static Logger logger = LoggerFactory.getLogger(ProfileUtils.class);
  25
  26     public static Profile decryptProfile(
  27             final ProfileKey profileKey, final SignalServiceProfile encryptedProfile
  28     ) {
  29         var profileCipher = new ProfileCipher(profileKey);
  30         IdentityKey identityKey = null;
  31         try {
  32             identityKey = new IdentityKey(Base64.getDecoder().decode(encryptedProfile.getIdentityKey()), 0);
  33         } catch (InvalidKeyException ignored) {
  34         }
  35
  36         try {
  37             var name = decrypt(encryptedProfile.getName(), profileCipher);
  38             var about = trimZeros(decrypt(encryptedProfile.getAbout(), profileCipher));
  39             var aboutEmoji = trimZeros(decrypt(encryptedProfile.getAboutEmoji(), profileCipher));
  40
  41             final var nameParts = splitName(name);
  42             return new Profile(System.currentTimeMillis(),
  43                     nameParts.first(),
  44                     nameParts.second(),
  45                     about,
  46                     aboutEmoji,
  47                     encryptedProfile.getAvatar(),
  48                     identityKey == null || encryptedProfile.getPaymentAddress() == null
  49                             ? null
  50                             : decryptAndVerifyMobileCoinAddress(encryptedProfile.getPaymentAddress(),
  51                                     profileCipher,
  52                                     identityKey.getPublicKey()),
  53                     getUnidentifiedAccessMode(encryptedProfile, profileCipher),
  54                     getCapabilities(encryptedProfile));
  55         } catch (InvalidCiphertextException e) {
  56             logger.debug("Failed to decrypt profile for {}", encryptedProfile.getServiceId(), e);
  57             return null;
  58         }
  59     }
  60
  61     public static Profile.UnidentifiedAccessMode getUnidentifiedAccessMode(
  62             final SignalServiceProfile encryptedProfile, final ProfileCipher profileCipher
  63     ) {
  64         if (encryptedProfile.isUnrestrictedUnidentifiedAccess()) {
  65             return Profile.UnidentifiedAccessMode.UNRESTRICTED;
  66         }
  67
  68         if (encryptedProfile.getUnidentifiedAccess() != null && profileCipher != null) {
  69             final var unidentifiedAccessVerifier = Base64.getDecoder().decode(encryptedProfile.getUnidentifiedAccess());
  70             if (profileCipher.verifyUnidentifiedAccess(unidentifiedAccessVerifier)) {
  71                 return Profile.UnidentifiedAccessMode.ENABLED;
  72             }
  73         }
  74
  75         return Profile.UnidentifiedAccessMode.DISABLED;
  76     }
  77
  78     public static HashSet<Profile.Capability> getCapabilities(final SignalServiceProfile encryptedProfile) {
  79         final var capabilities = new HashSet<Profile.Capability>();
  80         if (encryptedProfile.getCapabilities().isGv1Migration()) {
  81             capabilities.add(Profile.Capability.gv1Migration);
  82         }
  83         if (encryptedProfile.getCapabilities().isStorage()) {
  84             capabilities.add(Profile.Capability.storage);
  85         }
  86         if (encryptedProfile.getCapabilities().isSenderKey()) {
  87             capabilities.add(Profile.Capability.senderKey);
  88         }
  89         if (encryptedProfile.getCapabilities().isAnnouncementGroup()) {
  90             capabilities.add(Profile.Capability.announcementGroup);
  91         }
  92
  93         return capabilities;
  94     }
  95
  96     private static String decrypt(
  97             final String encryptedName, final ProfileCipher profileCipher
  98     ) throws InvalidCiphertextException {
  99         try {
 100             return encryptedName == null
 101                     ? null
 102                     : new String(profileCipher.decrypt(Base64.getDecoder().decode(encryptedName)));
 103         } catch (IllegalArgumentException e) {
 104             return null;
 105         }
 106     }
 107
 108     private static byte[] decryptAndVerifyMobileCoinAddress(
 109             final byte[] encryptedPaymentAddress, final ProfileCipher profileCipher, final ECPublicKey publicKey
 110     ) throws InvalidCiphertextException {
 111         byte[] decrypted;
 112         try {
 113             decrypted = profileCipher.decryptWithLength(encryptedPaymentAddress);
 114         } catch (IOException e) {
 115             return null;
 116         }
 117
 118         SignalServiceProtos.PaymentAddress paymentAddress;
 119         try {
 120             paymentAddress = SignalServiceProtos.PaymentAddress.parseFrom(decrypted);
 121         } catch (InvalidProtocolBufferException e) {
 122             return null;
 123         }
 124
 125         return PaymentUtils.verifyPaymentsAddress(paymentAddress, publicKey);
 126     }
 127
 128     private static Pair<String, String> splitName(String name) {
 129         if (name == null) {
 130             return new Pair<>(null, null);
 131         }
 132         String[] parts = name.split("\0");
 133
 134         return switch (parts.length) {
 135             case 0 -> new Pair<>(null, null);
 136             case 1 -> new Pair<>(parts[0], null);
 137             default -> new Pair<>(parts[0], parts[1]);
 138         };
 139     }
 140
 141     static String trimZeros(String str) {
 142         if (str == null) {
 143             return null;
 144         }
 145
 146         int pos = str.indexOf(0);
 147         return pos == -1 ? str : str.substring(0, pos);
 148     }
 149 }