How to access a protected znode from ZooKeeper using zkCli?

user_721540 0
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I have created a znode using:

zookeeper-0:/opt/zookeeper/bin # ./zkCli.sh create /mynode content digest:user:pass:cdrwa

How to access the znode using the zkCli.sh utility now?

zookeeper-0:/opt/zookeeper/bin # ./zkCli.sh get /mynode
Connecting to localhost:2181

WATCHER::

WatchedEvent state:SyncConnected type:None path:null
Authentication is not valid : /mynode
zookeeper-0:/opt/zookeeper/bin #

The getAcl is showing the following:

zookeeper-0:/opt/zookeeper/bin # ./zkCli.sh getAcl /mynode
Connecting to localhost:2181

WATCHER::

WatchedEvent state:SyncConnected type:None path:null
'digest,'user:pass
: cdrwa
zookeeper-0:/opt/zookeeper/bin #
apache-zookeeper
2 Answers

You need to create the digest ACL using the hashed password.

ZooKeeper Programmer's Guide

digest uses a username:password string to generate MD5 hash which is then used as an ACL ID identity. Authentication is done by sending the username:password in clear text. When used in the ACL the expression will be the username:base64 encoded SHA1 password digest.

Generate the hashed password

$ java -cp "./zookeeper-3.4.13.jar:./lib/slf4j-api-1.7.25.jar" \
org.apache.zookeeper.server.auth.DigestAuthenticationProvider user:pass
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
user:pass->user:smGaoVKd/cQkjm7b88GyorAUz20=

Create a node using the hashed password

[zk: zookeeper(CONNECTED) 0] create /mynode content digest:user:smGaoVKd/cQkjm7b88GyorAUz20=:cdrwa
Created /mynode

Accessing the protected node

[zk: zookeeper(CONNECTED) 1] get /mynode
Authentication is not valid : /mynode
[zk: zookeeper(CONNECTED) 2] addauth digest user:pass
[zk: zookeeper(CONNECTED) 3] get /mynode
content
cZxid = 0x14
ctime = Wed Sep 12 19:37:48 GMT 2018
mZxid = 0x14
mtime = Wed Sep 12 19:37:48 GMT 2018
pZxid = 0x14
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 7
numChildren = 0
user_57645370

If you look at the content of the zkcli.sh script, you will see a commented out block showing how to configure an environment variable with credentials:

#SOLR_ZK_CREDS_AND_ACLS="-DzkACLProvider=org.apache.solr.common.cloud.VMParamsAllAndReadonlyDigestZkACLProvider \
#  -DzkCredentialsProvider=org.apache.solr.common.cloud.VMParamsSingleSetCredentialsDigestZkCredentialsProvider \
#  -DzkDigestUsername=admin-user -DzkDigestPassword=CHANGEME-ADMIN-PASSWORD \
#  -DzkDigestReadonlyUsername=readonly-user -DzkDigestReadonlyPassword=CHANGEME-READONLY-PASSWORD"

You can configure the environment variable SOLR_ZK_CREDS_AND_ACLS on your local system with the correct credentials following this template and then the zkcli.sh script will use them when communicating with ZooKeeper.

user_4289450
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