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Field level encryption

Let's demonstrate field level encryption

View the full demo in realtime​

You can either follow all the steps manually, or watch the recording

Review the docker compose environment​

As can be seen from docker-compose.yaml the demo environment consists of the following services:

  • gateway1
  • gateway2
  • kafka-client
  • kafka1
  • kafka2
  • kafka3
  • schema-registry
  • zookeeper
cat docker-compose.yaml

Starting the docker environment​

Start all your docker processes, wait for them to be up and ready, then run in background

  • --wait: Wait for services to be running|healthy. Implies detached mode.
  • --detach: Detached mode: Run containers in the background
docker compose up --detach --wait

Creating virtual cluster teamA​

Creating virtual cluster teamA on gateway gateway1 and reviewing the configuration file to access it

# Generate virtual cluster teamA with service account sa
token=$(curl \
    --request POST "http://localhost:8888/admin/vclusters/v1/vcluster/teamA/username/sa" \
    --header 'Content-Type: application/json' \
    --user 'admin:conduktor' \
    --silent \
    --data-raw '{"lifeTimeSeconds": 7776000}' | jq -r ".token")

# Create access file
echo  """
bootstrap.servers=localhost:6969
security.protocol=SASL_PLAINTEXT
sasl.mechanism=PLAIN
sasl.jaas.config=org.apache.kafka.common.security.plain.PlainLoginModule required username='sa' password='$token';
""" > teamA-sa.properties

# Review file
cat teamA-sa.properties

Creating topic customers on teamA​

Creating on teamA:

  • Topic customers with partitions:1 and replication-factor:1
kafka-topics \
    --bootstrap-server localhost:6969 \
    --command-config teamA-sa.properties \
    --replication-factor 1 \
    --partitions 1 \
    --create --if-not-exists \
    --topic customers

Adding interceptor encrypt​

We want to encrypt only two fields, with an in memory KMS.

cat step-07-encrypt.json | jq

curl \
    --request POST "http://localhost:8888/admin/interceptors/v1/vcluster/teamA/interceptor/encrypt" \
    --header 'Content-Type: application/json' \
    --user 'admin:conduktor' \
    --silent \
    --data @step-07-encrypt.json | jq

Listing interceptors for teamA​

Listing interceptors on gateway1 for virtual cluster teamA

curl \
    --request GET 'http://localhost:8888/admin/interceptors/v1/vcluster/teamA' \
    --header 'Content-Type: application/json' \
    --user 'admin:conduktor' \
    --silent | jq

Let's send unencrypted json​

We are using regular kafka tools

Sending 2 events

{
  "name" : "tom",
  "username" : "tom@conduktor.io",
  "password" : "motorhead",
  "visa" : "#abc123",
  "address" : "Chancery lane, London"
}
{
  "name" : "laura",
  "username" : "laura@conduktor.io",
  "password" : "kitesurf",
  "visa" : "#888999XZ;",
  "address" : "Dubai, UAE"
}

with

echo '{"name":"tom","username":"tom@conduktor.io","password":"motorhead","visa":"#abc123","address":"Chancery lane, London"}' | \
    kafka-console-producer \
        --bootstrap-server localhost:6969 \
        --producer.config teamA-sa.properties \
        --topic customers

echo '{"name":"laura","username":"laura@conduktor.io","password":"kitesurf","visa":"#888999XZ;","address":"Dubai, UAE"}' | \
    kafka-console-producer \
        --bootstrap-server localhost:6969 \
        --producer.config teamA-sa.properties \
        --topic customers

Let's consume the message, and confirm tom and laura data is encrypted​

Let's consume the message, and confirm tom and laura data is encrypted in cluster teamA

kafka-console-consumer \
    --bootstrap-server localhost:6969 \
    --consumer.config teamA-sa.properties \
    --topic customers \
    --from-beginning \
    --timeout-ms 10000 | jq

returns 2 events

{
  "name" : "tom",
  "username" : "tom@conduktor.io",
  "password" : "AAAABQAAAAEAAAAzAZyTL3LF2+p1EdfKvrIs626109f3iFgWhIkgmfH325481NBa88owQs6zyeoGKnR0p/H5GwifpQjJuRoxJ08WK9Vo5SLFLaLstd7w1COt7KPAUWoAdm/zqi6sjHn9++c=",
  "visa" : "AAAABQAAAAEAAAAzAUSMa/tvk0HqciPJdw5K87jVyK8qWShUJohIt72igXEB9zNotloi3AzZ7t5zuTHb2bbmEMLQldYbYahPPiFLz87TL4qFatjqtJ2J9SpdZ8DHClID377ZOCwpHgjq",
  "address" : "Chancery lane, London"
}
{
  "name" : "laura",
  "username" : "laura@conduktor.io",
  "password" : "AAAABQAAAAEAAAAzAZyTL3LF2+p1EdfKvrIs626109f3iFgWhIkgmfH325481NBa88owQs6zyeoGKnR0p/H5VsWxypZMpcSVPKWRNn/WGoNGYCTv7L8SIlLvr7vYf6E6Ct0xCeV8yNafCw==",
  "visa" : "AAAABQAAAAEAAAAzAUSMa/tvk0HqciPJdw5K87jVyK8qWShUJohIt72igXEB9zNotloi3AzZ7t5zuTHb2bbmbmZwAx2sq0DrS2DDPgnDF61OxpEdHF2w6V+qmRmFuZhwBz47doX6iVnWdjaB",
  "address" : "Dubai, UAE"
}

Adding interceptor decrypt​

Let's add the decrypt interceptor to decipher messages, but decrypt only a visa

cat step-11-decrypt.json | jq

curl \
    --request POST "http://localhost:8888/admin/interceptors/v1/vcluster/teamA/interceptor/decrypt" \
    --header 'Content-Type: application/json' \
    --user 'admin:conduktor' \
    --silent \
    --data @step-11-decrypt.json | jq

Listing interceptors for teamA​

Listing interceptors on gateway1 for virtual cluster teamA

curl \
    --request GET 'http://localhost:8888/admin/interceptors/v1/vcluster/teamA' \
    --header 'Content-Type: application/json' \
    --user 'admin:conduktor' \
    --silent | jq

Confirm message from tom and laura are partially decrypted​

Confirm message from tom and laura are partially decrypted in cluster teamA

kafka-console-consumer \
    --bootstrap-server localhost:6969 \
    --consumer.config teamA-sa.properties \
    --topic customers \
    --from-beginning \
    --timeout-ms 10000 | jq

returns 2 events

{
  "name" : "tom",
  "username" : "tom@conduktor.io",
  "password" : "AAAABQAAAAEAAAAzAZyTL3LF2+p1EdfKvrIs626109f3iFgWhIkgmfH325481NBa88owQs6zyeoGKnR0p/H5GwifpQjJuRoxJ08WK9Vo5SLFLaLstd7w1COt7KPAUWoAdm/zqi6sjHn9++c=",
  "visa" : "#abc123",
  "address" : "Chancery lane, London"
}
{
  "name" : "laura",
  "username" : "laura@conduktor.io",
  "password" : "AAAABQAAAAEAAAAzAZyTL3LF2+p1EdfKvrIs626109f3iFgWhIkgmfH325481NBa88owQs6zyeoGKnR0p/H5VsWxypZMpcSVPKWRNn/WGoNGYCTv7L8SIlLvr7vYf6E6Ct0xCeV8yNafCw==",
  "visa" : "#888999XZ;",
  "address" : "Dubai, UAE"
}

Tearing down the docker environment​

Remove all your docker processes and associated volumes

  • --volumes: Remove named volumes declared in the "volumes" section of the Compose file and anonymous volumes attached to containers.
docker compose down --volumes

Conclusion

Yes, encryption in the Kafka world can be simple!