Allow user group membership check in ldap plugin

[everesio]

configuration example

build/kafka-proxy server \
            --bootstrap-server-mapping "localhost:19092,0.0.0.0:30001" \
            --bootstrap-server-mapping "localhost:29092,0.0.0.0:30002" \
            --bootstrap-server-mapping "localhost:39092,0.0.0.0:30003" \
            --debug-enable \
            --auth-local-enable  \
            --auth-local-command=build/auth-ldap  \
            --auth-local-param=--url=ldap://localhost:389  \
            --auth-local-param=--start-tls=false \
            --auth-local-param=--bind-dn=cn=admin,dc=example,dc=org  \
            --auth-local-param=--bind-passwd=admin  \
            --auth-local-param=--user-search-base=ou=people,dc=example,dc=org  \
            --auth-local-param=--user-filter="(&(objectClass=person)(uid=%u)(memberOf=cn=kafka-users,ou=realm-roles,dc=example,dc=org))"

[everesio]

@gustavomcarmo Please check it out. AFAIR you were interested in group membership check in the LDAP Plugin.

[gustavomcarmo]

Great! I'll give it a try asap and give you some feedback...

Thanks!

[gustavomcarmo]

Hi @everesio,

Just tested the new ldap filter feature and it works like a charm. You can check it out in the kafka-proxy-test project.

Great job! Ship it!

[everesio]

@gustavomcarmo
Hi, thank you for feedback.

[gustavomcarmo]

Hi @everesio,

When is going to be released the new version of kafka-proxy with this feature?

Thanks!

[gustavomcarmo]

Hi @everesio,

Thanks for releasing the new version!

Just a question: would it be possible setting the LDAP admin credentials in the plugin configuration (--bind-dn and --bind-passwd) by using Kubernetes secrets?

Thanks!

[everesio]

Hi @gustavomcarmo
Using secrets would mean reading from file.
Are the env variables not secure enough for you use case ?
e.g. Kubernetes sidecar container example (TLS_CLIENT_KEY_PASSWORD) ?

        - name: kafka-proxy
          image: grepplabs/kafka-proxy:latest
          args:
            - 'server'
            - '--log-format=json'
            - '--tls-client-key-password=$(TLS_CLIENT_KEY_PASSWORD)'
          env:
          - name: TLS_CLIENT_KEY_PASSWORD
            valueFrom:
              secretKeyRef:
                name: tls-client-key-password
                key: password

[gustavomcarmo]

Hi @everesio,

Yes, you're right. I can use environment variables.

Thanks!

[everesio]

Hi @gustavomcarmo
FYI. From release v0.2.7, 2 docker images are built.
e.g.

• grepplabs/kafka-proxy:v0.2.7
• grepplabs/kafka-proxy:v0.2.7-all

The second one contains precompiled plugins which are located in /opt/kafka-proxy/bin/
Please checkout the Docker images with precompiled plugins in the README.md