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Posted to dev@zookeeper.apache.org by "Thomas Hamm (JIRA)" <ji...@apache.org> on 2017/01/23 13:20:26 UTC
[jira] [Commented] (ZOOKEEPER-1736) Zookeeper SASL authentication
allows anonymus users to log in
[ https://issues.apache.org/jira/browse/ZOOKEEPER-1736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15834470#comment-15834470 ]
Thomas Hamm commented on ZOOKEEPER-1736:
----------------------------------------
[~apurtell], I'm curious about if there is now a way to prevent anonymous users to connect to zk. Seems like a serious security issue to me.
> Zookeeper SASL authentication allows anonymus users to log in
> -------------------------------------------------------------
>
> Key: ZOOKEEPER-1736
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1736
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Environment: Development
> Reporter: AntonioS
>
> Hello.
> I have configured Zookeeper to provide SASL authentication, using ordinary username and password stored in the JAAS.conf as a DigestLoginModule
> I have created a simple jaas.conf file:
> Server {
> org.apache.zookeeper.server.auth.DigestLoginModule required
> user_admin="admin";
> };
> Client {
> org.apache.zookeeper.server.auth.DigestLoginModule required
> username="admin"
> password="admin";
> };
> I have the zoo.cfg correctly configured for security, adding the following:
> requireClientAuthScheme=sasl
> authProvider.1=org.apache.zookeeper.server.auth.SASLAuthenticationProvider
> jaasLoginRenew=3600000
> zookeeper.allowSaslFailedClients=false
> And I also have the java.env file:
> export JVMFLAGS="-Djava.security.auth.login.config=/etc/zookeeper/conf/jaas.conf -Dzookeeper.allowSaslFailedClients=false"
> Everything looks good. If I put the right username and password I authenticate, otherwise not and I get an exception.
> The problem is when I don’t put any username and password at all, zookeeper allows me to go through.
> I tried different things but nothing stops anonymous users to log in.
> I was looking at the source code, in particular the ZookeeperServer.java, this method:
> public void processPacket(ServerCnxn cnxn, ByteBuffer incomingBuffer) throws IOException {
> The section below:
> } else {
> if (h.getType() == OpCode.sasl) {
> Record rsp = processSasl(incomingBuffer,cnxn);
> ReplyHeader rh = new ReplyHeader(h.getXid(), 0, KeeperException.Code.OK.intValue());
> cnxn.sendResponse(rh,rsp, "response"); // not sure about 3rd arg..what is it?
> }
> else {
> Request si = new Request(cnxn, cnxn.getSessionId(), h.getXid(),
> h.getType(), incomingBuffer, cnxn.getAuthInfo());
> si.setOwner(ServerCnxn.me);
> submitRequest(si);
> }
> }
> The else flow appears to just forward any anonymous request to the handler, without attempting any authentication.
> Is this a bug? Is there any way to stop anonymous users connecting to Zookeeper?
> Thanks
> Antonio
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