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authorAndreas Straub <andy@strb.org>2015-07-03 13:34:34 +0200
committerAndreas Straub <andy@strb.org>2015-07-05 17:27:29 +0200
commit72619de889a80f2d3b17f8ddbc30c2f60e6068e0 (patch)
treececa8dbf31ae051654a5587545a19b0931da2094 /src
parent12fc24dd4205bb2ff67ff9e2e2b3400cd894a370 (diff)
Refresh PEP on session establish
We now track preKeys used to establish incoming sessions with us. On each new established session, we remove the used prekey from PEP. We have to do this because libaxolotl-java internally clears the used preKey from its storage, so we will not be able to establish any future sessions using that key.
Diffstat (limited to 'src')
-rw-r--r--src/main/java/eu/siacs/conversations/crypto/axolotl/AxolotlService.java18
1 files changed, 18 insertions, 0 deletions
diff --git a/src/main/java/eu/siacs/conversations/crypto/axolotl/AxolotlService.java b/src/main/java/eu/siacs/conversations/crypto/axolotl/AxolotlService.java
index d79fa1bf..420c75b5 100644
--- a/src/main/java/eu/siacs/conversations/crypto/axolotl/AxolotlService.java
+++ b/src/main/java/eu/siacs/conversations/crypto/axolotl/AxolotlService.java
@@ -444,6 +444,7 @@ public class AxolotlService {
public static class XmppAxolotlSession {
private SessionCipher cipher;
private boolean isTrusted = false;
+ private Integer preKeyId = null;
private SQLiteAxolotlStore sqLiteAxolotlStore;
private AxolotlAddress remoteAddress;
@@ -463,6 +464,14 @@ public class AxolotlService {
return this.isTrusted;
}
+ public Integer getPreKeyId() {
+ return preKeyId;
+ }
+
+ public void resetPreKeyId() {
+ preKeyId = null;
+ }
+
public byte[] processReceiving(XmppAxolotlMessage.XmppAxolotlMessageHeader incomingHeader) {
byte[] plaintext = null;
try {
@@ -470,6 +479,9 @@ public class AxolotlService {
PreKeyWhisperMessage message = new PreKeyWhisperMessage(incomingHeader.getContents());
Log.d(Config.LOGTAG, "PreKeyWhisperMessage ID:" + message.getSignedPreKeyId() + "/" + message.getPreKeyId());
plaintext = cipher.decrypt(message);
+ if (message.getPreKeyId().isPresent()) {
+ preKeyId = message.getPreKeyId().get();
+ }
} catch (InvalidMessageException | InvalidVersionException e) {
WhisperMessage message = new WhisperMessage(incomingHeader.getContents());
plaintext = cipher.decrypt(message);
@@ -946,6 +958,12 @@ public class AxolotlService {
Log.d(Config.LOGTAG, "Got payload key from axolotl header. Decrypting message...");
plaintextMessage = message.decrypt(session, payloadKey);
}
+ Integer preKeyId = session.getPreKeyId();
+ if (preKeyId != null) {
+ publishBundlesIfNeeded();
+ session.resetPreKeyId();
+ }
+ break;
}
}