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https://github.com/grepplabs/kafka-proxy
Proxy connections to Kafka cluster. Connect through SOCKS Proxy, HTTP Proxy or to cluster running in Kubernetes.
https://github.com/grepplabs/kafka-proxy
kafka kafka-gateway kafka-proxy oauthbearer proxy sasl socks5
Last synced: 3 months ago
JSON representation
Proxy connections to Kafka cluster. Connect through SOCKS Proxy, HTTP Proxy or to cluster running in Kubernetes.
- Host: GitHub
- URL: https://github.com/grepplabs/kafka-proxy
- Owner: grepplabs
- License: apache-2.0
- Created: 2018-02-14T14:39:49.000Z (over 6 years ago)
- Default Branch: master
- Last Pushed: 2024-01-17T17:48:00.000Z (5 months ago)
- Last Synced: 2024-01-18T01:28:46.521Z (5 months ago)
- Topics: kafka, kafka-gateway, kafka-proxy, oauthbearer, proxy, sasl, socks5
- Language: Go
- Homepage:
- Size: 11.5 MB
- Stars: 420
- Watchers: 15
- Forks: 77
- Open Issues: 34
-
Metadata Files:
- Readme: README.md
- Funding: .github/FUNDING.yml
- License: LICENSE
Lists
- awesome-kafka - Kafka Proxy providing SASL/PLAIN authentication and SSL
- awesome-network-stuff - **95**星
- awesome-network-stuff - **95**星
README
## kafka-proxy
[](https://github.com/grepplabs/kafka-proxy/actions/workflows/build.yaml)
[](https://hub.docker.com/r/grepplabs/kafka-proxy)
[](https://hub.docker.com/r/grepplabs/kafka-proxy)
The Kafka Proxy is based on idea of [Cloud SQL Proxy](https://github.com/GoogleCloudPlatform/cloudsql-proxy).
It allows a service to connect to Kafka brokers without having to deal with SASL/PLAIN authentication and SSL certificates.
It works by opening tcp sockets on the local machine and proxying connections to the associated Kafka brokers
when the sockets are used. The host and port in [Metadata](http://kafka.apache.org/protocol.html#The_Messages_Metadata)
and [FindCoordinator](http://kafka.apache.org/protocol.html#The_Messages_FindCoordinator)
responses received from the brokers are replaced by local counterparts.
For discovered brokers (not configured as the boostrap servers), local listeners are started on random ports.
The dynamic local listeners feature can be disabled and an additional list of external server mappings can be provided.
The Proxy can terminate TLS traffic and authenticate users using SASL/PLAIN. The credentials verification method
is configurable and uses golang plugin system over RPC.
The proxies can also authenticate each other using a pluggable method which is transparent to other Kafka servers and clients.
Currently, the Google ID Token for service accounts is implemented i.e. proxy client requests and sends service account JWT and proxy server receives and validates it against Google JWKS.
Kafka API calls can be restricted to prevent some operations e.g. topic deletion or produce requests.
See:
* [Kafka Proxy with Amazon MSK](https://gist.github.com/everesio/262e11c6e5cebf56f1d5111c8cd7da3f)
* [A Guide To The Kafka Protocol](https://cwiki.apache.org/confluence/display/KAFKA/A+Guide+To+The+Kafka+Protocol)
* [Kafka protocol guide](http://kafka.apache.org/protocol.html)
### Supported Kafka versions
Following table provides overview of supported Kafka versions (specified one and all previous Kafka versions).
As not every Kafka release adds new messages/versions which are relevant to the Kafka proxy, newer Kafka versions can also work.
| Kafka proxy version | Kafka version |
|---------------------|---------------|
| | from 0.11.0 |
| 0.2.9 | to 2.8.0 |
| 0.3.1 | to 3.4.0 |
### Install binary release
1. Download the latest release
Linux
curl -Ls https://github.com/grepplabs/kafka-proxy/releases/download/v0.3.8/kafka-proxy-v0.3.8-linux-amd64.tar.gz | tar xz
macOS
curl -Ls https://github.com/grepplabs/kafka-proxy/releases/download/v0.3.8/kafka-proxy-v0.3.8-darwin-amd64.tar.gz | tar xz
2. Move the binary in to your PATH.
```
sudo mv ./kafka-proxy /usr/local/bin/kafka-proxy
```
### Building
make clean build
### Docker images
Docker images are available on [Docker Hub](https://hub.docker.com/r/grepplabs/kafka-proxy/tags).
You can launch a kafka-proxy container for trying it out with
docker run --rm -p 30001-30003:30001-30003 grepplabs/kafka-proxy:0.3.8 \
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" \
--dial-address-mapping "localhost:19092,172.17.0.1:19092" \
--dial-address-mapping "localhost:29092,172.17.0.1:29092" \
--dial-address-mapping "localhost:39092,172.17.0.1:39092" \
--debug-enable
Kafka-proxy will now be reachable on `localhost:30001`, `localhost:30002` and `localhost:30003`, connecting to kafka brokers
running in docker (network bridge gateway `172.17.0.1`) advertising PLAINTEXT listeners on `localhost:19092`, `localhost:29092` and `localhost:39092`.
### Docker images with precompiled plugins
Docker images with precompiled plugins located in `/opt/kafka-proxy/bin/` are tagged with `-all`.
You can launch a kafka-proxy container with auth-ldap plugin for trying it out with
docker run --rm -p 30001-30003:30001-30003 grepplabs/kafka-proxy:0.3.8-all \
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" \
--dial-address-mapping "localhost:19092,172.17.0.1:19092" \
--dial-address-mapping "localhost:29092,172.17.0.1:29092" \
--dial-address-mapping "localhost:39092,172.17.0.1:39092" \
--debug-enable \
--auth-local-enable \
--auth-local-command=/opt/kafka-proxy/bin/auth-ldap \
--auth-local-param=--url=ldap://172.17.0.1:389 \
--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))"
### Help output
Run the kafka-proxy server
Usage:
kafka-proxy server [flags]
Flags:
--auth-gateway-client-command string Path to authentication plugin binary
--auth-gateway-client-enable Enable gateway client authentication
--auth-gateway-client-log-level string Log level of the auth plugin (default "trace")
--auth-gateway-client-magic uint Magic bytes sent in the handshake
--auth-gateway-client-method string Authentication method
--auth-gateway-client-param stringArray Authentication plugin parameter
--auth-gateway-client-timeout duration Authentication timeout (default 10s)
--auth-gateway-server-command string Path to authentication plugin binary
--auth-gateway-server-enable Enable proxy server authentication
--auth-gateway-server-log-level string Log level of the auth plugin (default "trace")
--auth-gateway-server-magic uint Magic bytes sent in the handshake
--auth-gateway-server-method string Authentication method
--auth-gateway-server-param stringArray Authentication plugin parameter
--auth-gateway-server-timeout duration Authentication timeout (default 10s)
--auth-local-command string Path to authentication plugin binary
--auth-local-enable Enable local SASL/PLAIN authentication performed by listener - SASL handshake will not be passed to kafka brokers
--auth-local-log-level string Log level of the auth plugin (default "trace")
--auth-local-mechanism string SASL mechanism used for local authentication: PLAIN or OAUTHBEARER (default "PLAIN")
--auth-local-param stringArray Authentication plugin parameter
--auth-local-timeout duration Authentication timeout (default 10s)
--bootstrap-server-mapping stringArray Mapping of Kafka bootstrap server address to local address (host:port,host:port(,advhost:advport))
--debug-enable Enable Debug endpoint
--debug-listen-address string Debug listen address (default "0.0.0.0:6060")
--default-listener-ip string Default listener IP (default "0.0.0.0")
--dial-address-mapping stringArray Mapping of target broker address to new one (host:port,host:port). The mapping is performed during connection establishment
--dynamic-advertised-listener string Advertised address for dynamic listeners. If empty, default-listener-ip is used
--dynamic-listeners-disable Disable dynamic listeners.
--dynamic-sequential-min-port int If set to non-zero, makes the dynamic listener use a sequential port starting with this value rather than a random port every time.
--external-server-mapping stringArray Mapping of Kafka server address to external address (host:port,host:port). A listener for the external address is not started
--forbidden-api-keys ints Forbidden Kafka request types. The restriction should prevent some Kafka operations e.g. 20 - DeleteTopics
--forward-proxy string URL of the forward proxy. Supported schemas are socks5 and http
--gssapi-auth-type string GSSAPI auth type: KEYTAB or USER (default "KEYTAB")
--gssapi-disable-pa-fx-fast Used to configure the client to not use PA_FX_FAST.
--gssapi-keytab string krb5.keytab file location
--gssapi-krb5 string krb5.conf file path, default: /etc/krb5.conf (default "/etc/krb5.conf")
--gssapi-password string Password for auth type USER
--gssapi-realm string Realm
--gssapi-servicename string ServiceName (default "kafka")
--gssapi-spn-host-mapping stringToString Mapping of Kafka servers address to SPN hosts (default [])
--gssapi-username string Username (default "kafka")
-h, --help help for server
--http-disable Disable HTTP endpoints
--http-health-path string Path on which to health endpoint (default "/health")
--http-listen-address string Address that kafka-proxy is listening on (default "0.0.0.0:9080")
--http-metrics-path string Path on which to expose metrics (default "/metrics")
--kafka-client-id string An optional identifier to track the source of requests (default "kafka-proxy")
--kafka-connection-read-buffer-size int Size of the operating system's receive buffer associated with the connection. If zero, system default is used
--kafka-connection-write-buffer-size int Sets the size of the operating system's transmit buffer associated with the connection. If zero, system default is used
--kafka-dial-timeout duration How long to wait for the initial connection (default 15s)
--kafka-keep-alive duration Keep alive period for an active network connection. If zero, keep-alives are disabled (default 1m0s)
--kafka-max-open-requests int Maximal number of open requests pro tcp connection before sending on it blocks (default 256)
--kafka-read-timeout duration How long to wait for a response (default 30s)
--kafka-write-timeout duration How long to wait for a transmit (default 30s)
--log-format string Log format text or json (default "text")
--log-level string Log level debug, info, warning, error, fatal or panic (default "info")
--log-level-fieldname string Log level fieldname for json format (default "@level")
--log-msg-fieldname string Message fieldname for json format (default "@message")
--log-time-fieldname string Time fieldname for json format (default "@timestamp")
--producer-acks-0-disabled Assume fire-and-forget is never sent by the producer. Enabling this parameter will increase performance
--proxy-listener-ca-chain-cert-file string PEM encoded CA's certificate file. If provided, client certificate is required and verified
--proxy-listener-cert-file string PEM encoded file with server certificate
--proxy-listener-cipher-suites strings List of supported cipher suites
--proxy-listener-curve-preferences strings List of curve preferences
--proxy-listener-keep-alive duration Keep alive period for an active network connection. If zero, keep-alives are disabled (default 1m0s)
--proxy-listener-key-file string PEM encoded file with private key for the server certificate
--proxy-listener-key-password string Password to decrypt rsa private key
--proxy-listener-read-buffer-size int Size of the operating system's receive buffer associated with the connection. If zero, system default is used
--proxy-listener-tls-enable Whether or not to use TLS listener
--proxy-listener-tls-required-client-subject strings Required client certificate subject common name; example; s:/CN=[value]/C=[state]/C=[DE,PL] or r:/CN=[^val.{2}$]/C=[state]/C=[DE,PL]; check manual for more details
--proxy-listener-write-buffer-size int Sets the size of the operating system's transmit buffer associated with the connection. If zero, system default is used
--proxy-request-buffer-size int Request buffer size pro tcp connection (default 4096)
--proxy-response-buffer-size int Response buffer size pro tcp connection (default 4096)
--sasl-aws-profile string AWS profile
--sasl-aws-region string Region for AWS IAM Auth
--sasl-enable Connect using SASL
--sasl-jaas-config-file string Location of JAAS config file with SASL username and password
--sasl-method string SASL method to use (PLAIN, SCRAM-SHA-256, SCRAM-SHA-512, GSSAPI, AWS_MSK_IAM (default "PLAIN")
--sasl-password string SASL user password
--sasl-plugin-command string Path to authentication plugin binary
--sasl-plugin-enable Use plugin for SASL authentication
--sasl-plugin-log-level string Log level of the auth plugin (default "trace")
--sasl-plugin-mechanism string SASL mechanism used for proxy authentication: PLAIN or OAUTHBEARER (default "OAUTHBEARER")
--sasl-plugin-param stringArray Authentication plugin parameter
--sasl-plugin-timeout duration Authentication timeout (default 10s)
--sasl-username string SASL user name
--tls-ca-chain-cert-file string PEM encoded CA's certificate file
--tls-client-cert-file string PEM encoded file with client certificate
--tls-client-key-file string PEM encoded file with private key for the client certificate
--tls-client-key-password string Password to decrypt rsa private key
--tls-enable Whether or not to use TLS when connecting to the broker
--tls-insecure-skip-verify It controls whether a client verifies the server's certificate chain and host name
--tls-same-client-cert-enable Use only when mutual TLS is enabled on proxy and broker. It controls whether a proxy validates if proxy client certificate exactly matches brokers client cert (tls-client-cert-file)
### Usage example
kafka-proxy server --bootstrap-server-mapping "192.168.99.100:32400,0.0.0.0:32399"
kafka-proxy server --bootstrap-server-mapping "192.168.99.100:32400,127.0.0.1:32400" \
--bootstrap-server-mapping "192.168.99.100:32401,127.0.0.1:32401" \
--bootstrap-server-mapping "192.168.99.100:32402,127.0.0.1:32402" \
--dynamic-listeners-disable
kafka-proxy server --bootstrap-server-mapping "kafka-0.example.com:9092,0.0.0.0:32401,kafka-0.grepplabs.com:9092" \
--bootstrap-server-mapping "kafka-1.example.com:9092,0.0.0.0:32402,kafka-1.grepplabs.com:9092" \
--bootstrap-server-mapping "kafka-2.example.com:9092,0.0.0.0:32403,kafka-2.grepplabs.com:9092" \
--dynamic-listeners-disable
kafka-proxy server --bootstrap-server-mapping "192.168.99.100:32400,127.0.0.1:32400" \
--external-server-mapping "192.168.99.100:32401,127.0.0.1:32402" \
--external-server-mapping "192.168.99.100:32402,127.0.0.1:32403" \
--forbidden-api-keys 20
export BOOTSTRAP_SERVER_MAPPING="192.168.99.100:32401,0.0.0.0:32402 192.168.99.100:32402,0.0.0.0:32403" && kafka-proxy server
### Restrict proxy listener cipher suites
kafka-proxy server --bootstrap-server-mapping "localhost:19092,0.0.0.0:30001,localhost:30001" \
--bootstrap-server-mapping "localhost:29092,0.0.0.0:30002,localhost:30002" \
--bootstrap-server-mapping "localhost:39092,0.0.0.0:30003,localhost:30003" \
--proxy-listener-cert-file "tls/ca-cert.pem" \
--proxy-listener-key-file "tls/ca-key.pem" \
--proxy-listener-tls-enable \
--proxy-listener-cipher-suites TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_AES_256_GCM_SHA384,TLS_AES_128_GCM_SHA256
### SASL authentication initiated by proxy example
SASL authentication is initiated by the proxy. SASL authentication is disabled on the clients and enabled on the Kafka brokers.
kafka-proxy server --bootstrap-server-mapping "kafka-0.grepplabs.com:9093,0.0.0.0:32399" \
--tls-enable --tls-insecure-skip-verify \
--sasl-enable --sasl-username myuser --sasl-password mysecret
kafka-proxy server --bootstrap-server-mapping "kafka-0.example.com:9092,0.0.0.0:30001" \
--bootstrap-server-mapping "kafka-1.example.com:9092,0.0.0.0:30002" \
--bootstrap-server-mapping "kafka-1.example.com:9093,0.0.0.0:30003" \
--sasl-enable \
--sasl-username "alice" \
--sasl-password "alice-secret" \
--sasl-method "SCRAM-SHA-512" \
--log-level debug
make clean build plugin.unsecured-jwt-provider && build/kafka-proxy server \
--sasl-enable \
--sasl-plugin-enable \
--sasl-plugin-mechanism "OAUTHBEARER" \
--sasl-plugin-command build/unsecured-jwt-provider \
--sasl-plugin-param "--claim-sub=alice" \
--bootstrap-server-mapping "192.168.99.100:32400,127.0.0.1:32400"
GSSAPI / Kerberos authentication
kafka-proxy server --bootstrap-server-mapping "kafka-0.grepplabs.com:9092,127.0.0.1:32500" \
--bootstrap-server-mapping "kafka-1.grepplabs.com:9092,127.0.0.1:32501" \
--bootstrap-server-mapping "kafka-2.grepplabs.com:9092,127.0.0.1:32502" \
--sasl-enable \
--sasl-method "GSSAPI" \
--gssapi-servicename kafka \
--gssapi-username kafkaclient1 \
--gssapi-realm EXAMPLE.COM \
--gssapi-krb5 /etc/krb5.conf \
--gssapi-keytab /etc/security/keytabs/kafka.keytab
AWS MSK IAM
kafka-proxy server --bootstrap-server-mapping "b-1-public.kafkaproxycluster.uls9ao.c4.kafka.eu-central-1.amazonaws.com:9198,0.0.0.0:30001" \
--bootstrap-server-mapping "b-2-public.kafkaproxycluster.uls9ao.c4.kafka.eu-central-1.amazonaws.com:9198,0.0.0.0:30002" \
--bootstrap-server-mapping "b-3-public.kafkaproxycluster.uls9ao.c4.kafka.eu-central-1.amazonaws.com:9198,0.0.0.0:30003" \
--tls-enable --tls-insecure-skip-verify \
--sasl-enable \
--sasl-method "AWS_MSK_IAM" \
--sasl-aws-region "eu-central-1" \
--log-level debug
### Proxy authentication example
SASL authentication is performed by the proxy. SASL authentication is enabled on the clients and disabled on the Kafka brokers.
make clean build plugin.auth-user && build/kafka-proxy server --proxy-listener-key-file "server-key.pem" \
--proxy-listener-cert-file "server-cert.pem" \
--proxy-listener-ca-chain-cert-file "ca.pem" \
--proxy-listener-tls-enable \
--auth-local-enable \
--auth-local-command build/auth-user \
--auth-local-param "--username=my-test-user" \
--auth-local-param "--password=my-test-password"
make clean build plugin.auth-ldap && build/kafka-proxy server \
--auth-local-enable \
--auth-local-command build/auth-ldap \
--auth-local-param "--url=ldaps://ldap.example.com:636" \
--auth-local-param "--user-dn=cn=users,dc=exemple,dc=com" \
--auth-local-param "--user-attr=uid" \
--bootstrap-server-mapping "192.168.99.100:32400,127.0.0.1:32400"
make clean build plugin.unsecured-jwt-info && build/kafka-proxy server \
--auth-local-enable \
--auth-local-command build/unsecured-jwt-info \
--auth-local-mechanism "OAUTHBEARER" \
--auth-local-param "--claim-sub=alice" \
--auth-local-param "--claim-sub=bob" \
--bootstrap-server-mapping "192.168.99.100:32400,127.0.0.1:32400"
### Same client certificate check enabled example
Validate that client certificate used by proxy client is exactly the same as client certificate in authentication initiated by proxy
kafka-proxy server --bootstrap-server-mapping "kafka-0.grepplabs.com:9093,0.0.0.0:32399" \
--tls-enable \
--tls-client-cert-file client.crt \
--tls-client-key-file client.pem \
--tls-client-key-password changeit \
--proxy-listener-tls-enable \
--proxy-listener-key-file server.pem \
--proxy-listener-cert-file server.crt \
--proxy-listener-key-password changeit \
--proxy-listener-ca-chain-cert-file ca.crt \
--tls-same-client-cert-enable
### Kafka Gateway example
Authentication between Kafka Proxy Client and Kafka Proxy Server with Google-ID (service account JWT)
kafka-proxy server --bootstrap-server-mapping "kafka-0.grepplabs.com:9092,127.0.0.1:32500" \
--bootstrap-server-mapping "kafka-1.grepplabs.com:9092,127.0.0.1:32501" \
--bootstrap-server-mapping "kafka-2.grepplabs.com:9092,127.0.0.1:32502" \
--dynamic-listeners-disable \
--http-disable \
--proxy-listener-tls-enable \
--proxy-listener-cert-file=/var/run/secret/server.cert.pem \
--proxy-listener-key-file=/var/run/secret/server.key.pem \
--auth-gateway-server-enable \
--auth-gateway-server-method google-id \
--auth-gateway-server-magic 3285573610483682037 \
--auth-gateway-server-command google-id-info \
--auth-gateway-server-param "--timeout=10" \
--auth-gateway-server-param "--audience=tcp://kafka-gateway.grepplabs.com" \
--auth-gateway-server-param "--email-regex=^[email protected]$"
kafka-proxy server --bootstrap-server-mapping "127.0.0.1:32500,127.0.0.1:32400" \
--bootstrap-server-mapping "127.0.0.1:32501,127.0.0.1:32401" \
--bootstrap-server-mapping "127.0.0.1:32502,127.0.0.1:32402" \
--dynamic-listeners-disable \
--http-disable \
--tls-enable \
--tls-ca-chain-cert-file /var/run/secret/client/ca-chain.cert.pem \
--auth-gateway-client-enable \
--auth-gateway-client-method google-id \
--auth-gateway-client-magic 3285573610483682037 \
--auth-gateway-client-command google-id-provider \
--auth-gateway-client-param "--credentials-file=/var/run/secret/client/service-account.json" \
--auth-gateway-client-param "--target-audience=tcp://kafka-gateway.grepplabs.com" \
--auth-gateway-client-param "--timeout=10"
### Connect to Kafka through SOCKS5 Proxy example
Connect through test SOCKS5 Proxy server
```
kafka-proxy tools socks5-proxy --addr localhost:1080
kafka-proxy server --bootstrap-server-mapping "kafka-0.grepplabs.com:9092,127.0.0.1:32500" \
--bootstrap-server-mapping "kafka-1.grepplabs.com:9092,127.0.0.1:32501" \
--bootstrap-server-mapping "kafka-2.grepplabs.com:9092,127.0.0.1:32502"
--forward-proxy socks5://localhost:1080
```
```
kafka-proxy tools socks5-proxy --addr localhost:1080 --username my-proxy-user --password my-proxy-password
kafka-proxy server --bootstrap-server-mapping "kafka-0.grepplabs.com:9092,127.0.0.1:32500" \
--bootstrap-server-mapping "kafka-1.grepplabs.com:9092,127.0.0.1:32501" \
--bootstrap-server-mapping "kafka-2.grepplabs.com:9092,127.0.0.1:32502" \
--forward-proxy socks5://my-proxy-user:my-proxy-password@localhost:1080
```
### Connect to Kafka through HTTP Proxy example
Connect through test HTTP Proxy server using CONNECT method
```
kafka-proxy tools http-proxy --addr localhost:3128
kafka-proxy server --bootstrap-server-mapping "kafka-0.grepplabs.com:9092,127.0.0.1:32500" \
--bootstrap-server-mapping "kafka-1.grepplabs.com:9092,127.0.0.1:32501" \
--bootstrap-server-mapping "kafka-2.grepplabs.com:9092,127.0.0.1:32502"
--forward-proxy http://localhost:3128
```
```
kafka-proxy tools http-proxy --addr localhost:3128 --username my-proxy-user --password my-proxy-password
kafka-proxy server --bootstrap-server-mapping "kafka-0.grepplabs.com:9092,127.0.0.1:32500" \
--bootstrap-server-mapping "kafka-1.grepplabs.com:9092,127.0.0.1:32501" \
--bootstrap-server-mapping "kafka-2.grepplabs.com:9092,127.0.0.1:32502" \
--forward-proxy http://my-proxy-user:my-proxy-password@localhost:3128
```
### Validating client certificate DN
Sometimes it might be necessary to not only validate that the client certificate is valid but also that the client certificate DN is issued for a concrete use case. This can be achieved using the following set of arguments:
```
--proxy-listener-tls-client-cert-validate-subject bool Whether to validate client certificate subject (default false)
--proxy-listener-tls-required-client-subject-common-name string Required client certificate subject common name
--proxy-listener-tls-required-client-subject-country stringArray Required client certificate subject country
--proxy-listener-tls-required-client-subject-province stringArray Required client certificate subject province
--proxy-listener-tls-required-client-subject-locality stringArray Required client certificate subject locality
--proxy-listener-tls-required-client-subject-organization stringArray Required client certificate subject organization
--proxy-listener-tls-required-client-subject-organizational-unit stringArray Required client certificate subject organizational unit
```
By setting `--proxy-listener-tls-client-cert-validate-subject true`, Kafka Proxy will inspect client certificate DN fields for the expected values set with the `--proxy-listener-tls-required-client-*` arguments. The matches are always exact and used together, fo all non empty values. For example, to allow a valid certificate for `country=DE` and `organization=grepplabs`, configure Kafka Proxy in the following way:
```
kafka-proxy server \
--proxy-listener-tls-client-cert-validate-subject true \
--proxy-listener-tls-required-client-subject-country DE \
--proxy-listener-tls-required-client-subject-organization grepplabs
```
### Kubernetes sidecar container example
```yaml
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: myapp
spec:
replicas: 1
selector:
matchLabels:
app: myapp
template:
metadata:
labels:
app: myapp
annotations:
prometheus.io/scrape: 'true'
spec:
containers:
- name: kafka-proxy
image: grepplabs/kafka-proxy:latest
args:
- 'server'
- '--log-format=json'
- '--bootstrap-server-mapping=kafka-0:9093,127.0.0.1:32400'
- '--bootstrap-server-mapping=kafka-1:9093,127.0.0.1:32401'
- '--bootstrap-server-mapping=kafka-2:9093,127.0.0.1:32402'
- '--tls-enable'
- '--tls-ca-chain-cert-file=/var/run/secret/kafka-ca-chain-certificate/ca-chain.cert.pem'
- '--tls-client-cert-file=/var/run/secret/kafka-client-certificate/client.cert.pem'
- '--tls-client-key-file=/var/run/secret/kafka-client-key/client.key.pem'
- '--tls-client-key-password=$(TLS_CLIENT_KEY_PASSWORD)'
- '--sasl-enable'
- '--sasl-jaas-config-file=/var/run/secret/kafka-client-jaas/jaas.config'
env:
- name: TLS_CLIENT_KEY_PASSWORD
valueFrom:
secretKeyRef:
name: tls-client-key-password
key: password
volumeMounts:
- name: "sasl-jaas-config-file"
mountPath: "/var/run/secret/kafka-client-jaas"
- name: "tls-ca-chain-certificate"
mountPath: "/var/run/secret/kafka-ca-chain-certificate"
- name: "tls-client-cert-file"
mountPath: "/var/run/secret/kafka-client-certificate"
- name: "tls-client-key-file"
mountPath: "/var/run/secret/kafka-client-key"
ports:
- name: metrics
containerPort: 9080
livenessProbe:
httpGet:
path: /health
port: 9080
initialDelaySeconds: 5
periodSeconds: 3
readinessProbe:
httpGet:
path: /health
port: 9080
initialDelaySeconds: 5
periodSeconds: 10
timeoutSeconds: 5
successThreshold: 2
failureThreshold: 5
- name: myapp
image: myapp:latest
ports:
- containerPort: 8080
name: metrics
env:
- name: BOOTSTRAP_SERVERS
value: "127.0.0.1:32400,127.0.0.1:32401,127.0.0.1:32402"
volumes:
- name: sasl-jaas-config-file
secret:
secretName: sasl-jaas-config-file
- name: tls-ca-chain-certificate
secret:
secretName: tls-ca-chain-certificate
- name: tls-client-cert-file
secret:
secretName: tls-client-cert-file
- name: tls-client-key-file
secret:
secretName: tls-client-key-file
```
### Connect to Kafka running in Kubernetes example (kafka proxy runs in cluster)
```yaml
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: kafka-proxy
spec:
selector:
matchLabels:
app: kafka-proxy
replicas: 1
serviceName: kafka-proxy
template:
metadata:
labels:
app: kafka-proxy
spec:
containers:
- name: kafka-proxy
image: grepplabs/kafka-proxy:latest
args:
- 'server'
- '--log-format=json'
- '--bootstrap-server-mapping=kafka-0:9093,127.0.0.1:32400'
- '--bootstrap-server-mapping=kafka-1:9093,127.0.0.1:32401'
- '--bootstrap-server-mapping=kafka-2:9093,127.0.0.1:32402'
- '--tls-enable'
- '--tls-ca-chain-cert-file=/var/run/secret/kafka-ca-chain-certificate/ca-chain.cert.pem'
- '--tls-client-cert-file=/var/run/secret/kafka-client-certificate/client.cert.pem'
- '--tls-client-key-file=/var/run/secret/kafka-client-key/client.key.pem'
- '--tls-client-key-password=$(TLS_CLIENT_KEY_PASSWORD)'
- '--sasl-enable'
- '--sasl-jaas-config-file=/var/run/secret/kafka-client-jaas/jaas.config'
- '--proxy-request-buffer-size=32768'
- '--proxy-response-buffer-size=32768'
- '--proxy-listener-read-buffer-size=32768'
- '--proxy-listener-write-buffer-size=131072'
- '--kafka-connection-read-buffer-size=131072'
- '--kafka-connection-write-buffer-size=32768'
env:
- name: TLS_CLIENT_KEY_PASSWORD
valueFrom:
secretKeyRef:
name: tls-client-key-password
key: password
volumeMounts:
- name: "sasl-jaas-config-file"
mountPath: "/var/run/secret/kafka-client-jaas"
- name: "tls-ca-chain-certificate"
mountPath: "/var/run/secret/kafka-ca-chain-certificate"
- name: "tls-client-cert-file"
mountPath: "/var/run/secret/kafka-client-certificate"
- name: "tls-client-key-file"
mountPath: "/var/run/secret/kafka-client-key"
ports:
- name: metrics
containerPort: 9080
- name: kafka-0
containerPort: 32400
- name: kafka-1
containerPort: 32401
- name: kafka-2
containerPort: 32402
livenessProbe:
httpGet:
path: /health
port: 9080
initialDelaySeconds: 5
periodSeconds: 3
readinessProbe:
httpGet:
path: /health
port: 9080
initialDelaySeconds: 5
periodSeconds: 10
timeoutSeconds: 5
successThreshold: 2
failureThreshold: 5
resources:
requests:
memory: 128Mi
cpu: 1000m
restartPolicy: Always
volumes:
- name: sasl-jaas-config-file
secret:
secretName: sasl-jaas-config-file
- name: tls-ca-chain-certificate
secret:
secretName: tls-ca-chain-certificate
- name: tls-client-cert-file
secret:
secretName: tls-client-cert-file
- name: tls-client-key-file
secret:
secretName: tls-client-key-file
```
```bash
kubectl port-forward kafka-proxy-0 32400:32400 32401:32401 32402:32402
```
Use localhost:32400, localhost:32401 and localhost:32402 as bootstrap servers
### Connect to Kafka running in Kubernetes example (kafka proxy runs locally)
#### one node Kafka cluster
kafka.properties
```
broker.id=0
advertised.listeners=PLAINTEXT://kafka-0.kafka-headless.kafka:9092
...
```
```bash
kubectl port-forward -n kafka kafka-0 9092:9092
```
```bash
kafka-proxy server --bootstrap-server-mapping "127.0.0.1:9092,0.0.0.0:19092" --dial-address-mapping "kafka-0.kafka-headless.kafka:9092,0.0.0.0:9092"
```
Use localhost:19092 as bootstrap servers
#### 3 nodes Kafka cluster
[strimzi 0.13.0 CRD](https://strimzi.io/)
```yaml
apiVersion: kafka.strimzi.io/v1beta1
kind: Kafka
metadata:
name: test-cluster
namespace: kafka
spec:
kafka:
version: 2.3.0
replicas: 3
listeners:
plain: {}
tls: {}
config:
offsets.topic.replication.factor: 3
transaction.state.log.replication.factor: 3
transaction.state.log.min.isr: 2
num.partitions: 60
default.replication.factor: 3
storage:
type: jbod
volumes:
- id: 0
type: persistent-claim
size: 20Gi
deleteClaim: true
zookeeper:
replicas: 3
storage:
type: persistent-claim
size: 5Gi
deleteClaim: true
entityOperator:
topicOperator: {}
userOperator: {}
```
```bash
kubectl port-forward -n kafka test-cluster-kafka-0 9092:9092
kubectl port-forward -n kafka test-cluster-kafka-1 9093:9092
kubectl port-forward -n kafka test-cluster-kafka-2 9094:9092
kafka-proxy server --log-level debug \
--bootstrap-server-mapping "127.0.0.1:9092,0.0.0.0:19092" \
--bootstrap-server-mapping "127.0.0.1:9093,0.0.0.0:19093" \
--bootstrap-server-mapping "127.0.0.1:9094,0.0.0.0:19094" \
--dial-address-mapping "test-cluster-kafka-0.test-cluster-kafka-brokers.kafka.svc.cluster.local:9092,0.0.0.0:9092" \
--dial-address-mapping "test-cluster-kafka-1.test-cluster-kafka-brokers.kafka.svc.cluster.local:9092,0.0.0.0:9093" \
--dial-address-mapping "test-cluster-kafka-2.test-cluster-kafka-brokers.kafka.svc.cluster.local:9092,0.0.0.0:9094"
```
Use localhost:19092 as bootstrap servers
### Embedded third-party source code
* [Cloud SQL Proxy](https://github.com/GoogleCloudPlatform/cloudsql-proxy)
* [Sarama](https://github.com/Shopify/sarama)