From 54de9afe818ea6dce5d59f58646a4dbb70c17271 Mon Sep 17 00:00:00 2001
From: Christian Schneppe <christian@pix-art.de>
Date: Sat, 27 Jan 2018 22:06:59 +0100
Subject: encrypt muc PM only to actual recipient

---
 .../messenger/crypto/axolotl/AxolotlService.java   | 28 ++++++++++++++++++----
 .../pixart/messenger/ui/ConversationFragment.java  |  6 +++--
 2 files changed, 27 insertions(+), 7 deletions(-)

(limited to 'src/main/java')

diff --git a/src/main/java/de/pixart/messenger/crypto/axolotl/AxolotlService.java b/src/main/java/de/pixart/messenger/crypto/axolotl/AxolotlService.java
index cece60c5a..55cbba9db 100644
--- a/src/main/java/de/pixart/messenger/crypto/axolotl/AxolotlService.java
+++ b/src/main/java/de/pixart/messenger/crypto/axolotl/AxolotlService.java
@@ -1233,6 +1233,23 @@ public class AxolotlService implements OnAdvancedStreamFeaturesLoaded {
         return true;
     }
 
+    //this is being used for private muc messages only
+    private boolean buildHeader(XmppAxolotlMessage axolotlMessage, Jid jid) {
+        if (jid == null) {
+            return false;
+        }
+        HashSet<XmppAxolotlSession> sessions = new HashSet<>();
+        sessions.addAll(this.sessions.getAll(getAddressForJid(jid).getName()).values());
+        if (sessions.isEmpty()) {
+            return false;
+        }
+        sessions.addAll(findOwnSessions());
+        for (XmppAxolotlSession session : sessions) {
+            axolotlMessage.addDevice(session);
+        }
+        return true;
+    }
+
     @Nullable
     public XmppAxolotlMessage encrypt(Message message) {
         final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(account.getJid().toBareJid(), getOwnDeviceId());
@@ -1248,12 +1265,13 @@ public class AxolotlService implements OnAdvancedStreamFeaturesLoaded {
             Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to encrypt message: " + e.getMessage());
             return null;
         }
-        //TODO: fix this for MUC PMs - Don't encrypt to all participants
-        if (!buildHeader(axolotlMessage, message.getConversation())) {
-            return null;
+        final boolean success;
+        if (message.getType() == Message.TYPE_PRIVATE) {
+            success = buildHeader(axolotlMessage, message.getTrueCounterpart());
+        } else {
+            success = buildHeader(axolotlMessage, message.getConversation());
         }
-
-        return axolotlMessage;
+        return success ? axolotlMessage : null;
     }
 
     public void preparePayloadMessage(final Message message, final boolean delay) {
diff --git a/src/main/java/de/pixart/messenger/ui/ConversationFragment.java b/src/main/java/de/pixart/messenger/ui/ConversationFragment.java
index 56ad55b8a..ad36be78a 100644
--- a/src/main/java/de/pixart/messenger/ui/ConversationFragment.java
+++ b/src/main/java/de/pixart/messenger/ui/ConversationFragment.java
@@ -501,8 +501,10 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
         if (conversation.getCorrectingMessage() == null) {
             message = new Message(conversation, body, conversation.getNextEncryption());
             if (conversation.getMode() == Conversation.MODE_MULTI) {
-                if (conversation.getNextCounterpart() != null) {
-                    message.setCounterpart(conversation.getNextCounterpart());
+                final Jid nextCounterpart = conversation.getNextCounterpart();
+                if (nextCounterpart != null) {
+                    message.setCounterpart(nextCounterpart);
+                    message.setTrueCounterpart(conversation.getMucOptions().getTrueCounterpart(nextCounterpart));
                     message.setType(Message.TYPE_PRIVATE);
                 }
             }
-- 
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