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.storage.recipients.Profile;
   5 import org.signal.libsignal.zkgroup.profiles.ProfileKey;
   6 import org.slf4j.Logger;
   7 import org.slf4j.LoggerFactory;
   8 import org.whispersystems.signalservice.api.crypto.InvalidCiphertextException;
   9 import org.whispersystems.signalservice.api.crypto.ProfileCipher;
  10 import org.whispersystems.signalservice.api.profiles.SignalServiceProfile;
  11
  12 import java.util.Base64;
  13 import java.util.HashSet;
  14
  15 public class ProfileUtils {
  16
  17     private final static Logger logger = LoggerFactory.getLogger(ProfileUtils.class);
  18
  19     public static Profile decryptProfile(
  20             final ProfileKey profileKey, final SignalServiceProfile encryptedProfile
  21     ) {
  22         var profileCipher = new ProfileCipher(profileKey);
  23         try {
  24             var name = decrypt(encryptedProfile.getName(), profileCipher);
  25             var about = trimZeros(decrypt(encryptedProfile.getAbout(), profileCipher));
  26             var aboutEmoji = trimZeros(decrypt(encryptedProfile.getAboutEmoji(), profileCipher));
  27
  28             final var nameParts = splitName(name);
  29             return new Profile(System.currentTimeMillis(),
  30                     nameParts.first(),
  31                     nameParts.second(),
  32                     about,
  33                     aboutEmoji,
  34                     encryptedProfile.getAvatar(),
  35                     encryptedProfile.getPaymentAddress(),
  36                     getUnidentifiedAccessMode(encryptedProfile, profileCipher),
  37                     getCapabilities(encryptedProfile));
  38         } catch (InvalidCiphertextException e) {
  39             logger.debug("Failed to decrypt profile for {}", encryptedProfile.getServiceId(), e);
  40             return null;
  41         }
  42     }
  43
  44     public static Profile.UnidentifiedAccessMode getUnidentifiedAccessMode(
  45             final SignalServiceProfile encryptedProfile, final ProfileCipher profileCipher
  46     ) {
  47         if (encryptedProfile.isUnrestrictedUnidentifiedAccess()) {
  48             return Profile.UnidentifiedAccessMode.UNRESTRICTED;
  49         }
  50
  51         if (encryptedProfile.getUnidentifiedAccess() != null && profileCipher != null) {
  52             final var unidentifiedAccessVerifier = Base64.getDecoder().decode(encryptedProfile.getUnidentifiedAccess());
  53             if (profileCipher.verifyUnidentifiedAccess(unidentifiedAccessVerifier)) {
  54                 return Profile.UnidentifiedAccessMode.ENABLED;
  55             }
  56         }
  57
  58         return Profile.UnidentifiedAccessMode.DISABLED;
  59     }
  60
  61     public static HashSet<Profile.Capability> getCapabilities(final SignalServiceProfile encryptedProfile) {
  62         final var capabilities = new HashSet<Profile.Capability>();
  63         if (encryptedProfile.getCapabilities().isGv1Migration()) {
  64             capabilities.add(Profile.Capability.gv1Migration);
  65         }
  66         if (encryptedProfile.getCapabilities().isStorage()) {
  67             capabilities.add(Profile.Capability.storage);
  68         }
  69         if (encryptedProfile.getCapabilities().isSenderKey()) {
  70             capabilities.add(Profile.Capability.senderKey);
  71         }
  72         if (encryptedProfile.getCapabilities().isAnnouncementGroup()) {
  73             capabilities.add(Profile.Capability.announcementGroup);
  74         }
  75
  76         return capabilities;
  77     }
  78
  79     private static String decrypt(
  80             final String encryptedName, final ProfileCipher profileCipher
  81     ) throws InvalidCiphertextException {
  82         try {
  83             return encryptedName == null
  84                     ? null
  85                     : new String(profileCipher.decrypt(Base64.getDecoder().decode(encryptedName)));
  86         } catch (IllegalArgumentException e) {
  87             return null;
  88         }
  89     }
  90
  91     private static Pair<String, String> splitName(String name) {
  92         if (name == null) {
  93             return new Pair<>(null, null);
  94         }
  95         String[] parts = name.split("\0");
  96
  97         return switch (parts.length) {
  98             case 0 -> new Pair<>(null, null);
  99             case 1 -> new Pair<>(parts[0], null);
 100             default -> new Pair<>(parts[0], parts[1]);
 101         };
 102     }
 103
 104     static String trimZeros(String str) {
 105         if (str == null) {
 106             return null;
 107         }
 108
 109         int pos = str.indexOf(0);
 110         return pos == -1 ? str : str.substring(0, pos);
 111     }
 112 }