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Karan Mehta commented on ZOOKEEPER-3905: ---------------------------------------- Great, thanks for the update. Looking forward for the patch. > Race condition causes sessions to be created for clients even though their > certificate authentication has failed > ---------------------------------------------------------------------------------------------------------------- > > Key: ZOOKEEPER-3905 > URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3905 > Project: ZooKeeper > Issue Type: Bug > Affects Versions: 3.5.8, 3.6.2 > Reporter: Karan Mehta > Assignee: Andor Molnar > Priority: Major > > To reproduce, apply the diff and run > ClientSSLTest#testSecureStandaloneServer() test. The logs would show that a > valid session was created before connection was rejected and client had to > retry > > {code:java} > diff --git > a/zookeeper-server/src/main/java/org/apache/zookeeper/common/ZKTrustManager.java > > b/zookeeper-server/src/main/java/org/apache/zookeeper/common/ZKTrustManager.java > index aa02145b2..df1bdcc0f 100644 > — > a/zookeeper-server/src/main/java/org/apache/zookeeper/common/ZKTrustManager.java > +++ > b/zookeeper-server/src/main/java/org/apache/zookeeper/common/ZKTrustManager.java > @@ -111,6 +111,7 @@ public void checkServerTrusted(X509Certificate[] chain, > String authType, SSLEngi > @Override > public void checkClientTrusted(X509Certificate[] chain, String authType) > throws CertificateException > { x509ExtendedTrustManager.checkClientTrusted(chain, authType); + throw new > CertificateException(); } > @Override > {code} > > What should have happened: > Server should instantly close the client's connection and NOT process any > request. > > Potential threat: > Malicious clients may be able to put unnecessary load/traffic on the leader > by creating these sessions. > > Race Condition: > In CertificateVerifier#operationComplete(), `addCnxn(cnxn)` method is only > called after auth is completed. NettyServerCnxn#close() returns as a no-op > [here|https://github.com/apache/zookeeper/blob/branch-3.5/zookeeper-server/src/main/java/org/apache/zookeeper/server/NettyServerCnxn.java#L105]. > > I see this as an issue. Please assess the risk and let me know if this is a > legit behavior or not. > -- This message was sent by Atlassian Jira (v8.3.4#803005)