feat(pubsub): support kafka tls and sasl/plain auth

.github/workflows/centos7-ci.yml

@@ -79,6 +79,8 @@ jobs:
 
     - name: Run other docker containers for test
       run: |
+        # generating SSL certificates for Kafka
+        keytool -genkeypair -keyalg RSA -dname "CN=127.0.0.1" -alias 127.0.0.1 -keystore ./ci/pod/kafka/kafka-server/selfsigned.jks -validity 365 -keysize 2048 -storepass changeit
         make ci-env-up
         ./ci/linux-ci-init-service.sh
 

apisix/plugins/kafka-proxy.lua

@@ -0,0 +1,61 @@
+--
+-- Licensed to the Apache Software Foundation (ASF) under one or more
+-- contributor license agreements.  See the NOTICE file distributed with
+-- this work for additional information regarding copyright ownership.
+-- The ASF licenses this file to You under the Apache License, Version 2.0
+-- (the "License"); you may not use this file except in compliance with
+-- the License.  You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+--
+local core = require("apisix.core")
+
+
+local schema = {
+    type = "object",
+    properties = {
+        sasl = {
+            type = "object",
+            properties = {
+                username = {
+                    type = "string",
+                },
+                password = {
+                    type = "string",
+                },
+            },
+            required = {"username", "password"},
+        },
+    },
+}
+
+
+local _M = {
+    version = 0.1,
+    priority = 508,
+    name = "kafka-proxy",
+    schema = schema,
+}
+
+
+function _M.check_schema(conf)
+    return core.schema.check(schema, conf)
+end
+
+
+function _M.access(conf, ctx)
+    if conf.sasl then
+        ctx.kafka_consumer_enable_sasl = true
+        ctx.kafka_consumer_sasl_username = conf.sasl.username
+        ctx.kafka_consumer_sasl_password = conf.sasl.password
+    end
+end
+
+
+return _M

apisix/pubsub/kafka.lua

@@ -69,9 +69,21 @@ function _M.access(api_ctx)
             host = node.host,
             port = node.port,
         }
+
+        if api_ctx.kafka_consumer_enable_sasl then
+            broker_list[i].sasl_config = {
+                mechanism = "PLAIN",
+                user = api_ctx.kafka_consumer_sasl_username,
+                password = api_ctx.kafka_consumer_sasl_password,
+            }
+        end
     end
 
     local client_config = {refresh_interval = 30 * 60 * 1000}
+    if api_ctx.matched_upstream.tls then
+        client_config.ssl = true
+        client_config.ssl_verify = api_ctx.matched_upstream.tls.verify
+    end
 
     -- load and create the consumer instance when it is determined
     -- that the websocket connection was created successfully

apisix/schema_def.lua

@@ -406,8 +406,17 @@ local upstream_schema = {
             properties = {
                 client_cert = certificate_scheme,
                 client_key = private_key_schema,
+                verify = {
+                    type = "boolean",
+                    description = "Turn on server certificate verification, "..
+                        "currently only kafka upstream is supported",
+                    default = false,
+                },
             },
-            required = {"client_cert", "client_key"},
+            dependencies = {
+                client_cert = {"client_key"},
+                client_key = {"client_cert"},
+            }
         },
         keepalive_pool = {
             type = "object",

apisix/upstream.lua

@@ -435,7 +435,7 @@ local function check_upstream_conf(in_dp, conf)
         end
     end
 
-    if conf.tls then
+    if conf.tls and conf.tls.client_cert then
         local cert = conf.tls.client_cert
         local key = conf.tls.client_key
         local ok, err = apisix_ssl.validate(cert, key)

ci/linux_openresty_common_runner.sh

@@ -21,6 +21,9 @@
 before_install() {
     sudo cpanm --notest Test::Nginx >build.log 2>&1 || (cat build.log && exit 1)
 
+    # generating SSL certificates for Kafka
+    keytool -genkeypair -keyalg RSA -dname "CN=127.0.0.1" -alias 127.0.0.1 -keystore ./ci/pod/kafka/kafka-server/selfsigned.jks -validity 365 -keysize 2048 -storepass changeit
+
     # launch deps env
     make ci-env-up
     ./ci/linux-ci-init-service.sh

ci/pod/docker-compose.yml

@@ -73,11 +73,17 @@ services:
     restart: unless-stopped
     ports:
       - "9092:9092"
+      - "9093:9093"
+      - "9094:9094"
     depends_on:
       - zookeeper-server1
       - zookeeper-server2
     networks:
       kafka_net:
+    volumes:
+      - ./ci/pod/kafka/kafka-server/kafka_jaas.conf:/opt/bitnami/kafka/config/kafka_jaas.conf:ro
+      - ./ci/pod/kafka/kafka-server/selfsigned.jks:/opt/bitnami/kafka/config/certs/kafka.keystore.jks:ro
+      - ./ci/pod/kafka/kafka-server/selfsigned.jks:/opt/bitnami/kafka/config/certs/kafka.truststore.jks:ro
 
   kafka-server2:
     image: bitnami/kafka:2.8.1
@@ -88,11 +94,17 @@ services:
     restart: unless-stopped
     ports:
       - "19092:9092"
+      - "19093:9093"
+      - "19094:9094"
     depends_on:
       - zookeeper-server1
       - zookeeper-server2
     networks:
       kafka_net:
+    volumes:
+      - ./ci/pod/kafka/kafka-server/kafka_jaas.conf:/opt/bitnami/kafka/config/kafka_jaas.conf:ro
+      - ./ci/pod/kafka/kafka-server/selfsigned.jks:/opt/bitnami/kafka/config/certs/kafka.keystore.jks:ro
+      - ./ci/pod/kafka/kafka-server/selfsigned.jks:/opt/bitnami/kafka/config/certs/kafka.truststore.jks:ro
 
 
   ## Eureka

ci/pod/kafka/kafka-server/env/common.env

@@ -1,3 +1,8 @@
 ALLOW_PLAINTEXT_LISTENER=yes
-KAFKA_CFG_AUTO_CREATE_TOPICS_ENABLE=true
-KAFKA_CFG_ADVERTISED_LISTENERS=PLAINTEXT://127.0.0.1:9092
+KAFKA_CFG_AUTO_CREATE_TOPICS_ENABLE=false
+KAFKA_CFG_LISTENERS=PLAINTEXT://0.0.0.0:9092,SSL://0.0.0.0:9093,SASL_PLAINTEXT://0.0.0.0:9094
+KAFKA_CFG_ADVERTISED_LISTENERS=PLAINTEXT://127.0.0.1:9092,SSL://127.0.0.1:9093,SASL_PLAINTEXT://127.0.0.1:9094
+KAFKA_CFG_SSL_ENDPOINT_IDENTIFICATION_ALGORITHM=
+KAFKA_CFG_SSL_KEYSTORE_LOCATION=/opt/bitnami/kafka/config/certs/kafka.keystore.jks
+KAFKA_CFG_SSL_KEYSTORE_PASSWORD=changeit
+KAFKA_CFG_SSL_KEY_PASSWORD=changeit

ci/pod/kafka/kafka-server/kafka_jaas.conf

@@ -0,0 +1,23 @@
+//
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+KafkaServer {
+    org.apache.kafka.common.security.plain.PlainLoginModule required
+    username="admin"
+    password="admin-secret"
+    user_admin="admin-secret";
+};

conf/config-default.yaml

@@ -374,6 +374,7 @@ plugins:                          # plugin list (sorted by priority)
   - traffic-split                  # priority: 966
   - redirect                       # priority: 900
   - response-rewrite               # priority: 899
+  - kafka-proxy                    # priority: 508
   #- dubbo-proxy                   # priority: 507
   - grpc-transcode                 # priority: 506
   - grpc-web                       # priority: 505

docs/en/latest/config.json

@@ -172,7 +172,8 @@
           "label": "Other Protocols",
           "items": [
             "plugins/dubbo-proxy",
-            "plugins/mqtt-proxy"
+            "plugins/mqtt-proxy",
+            "plugins/kafka-proxy"
           ]
         }
       ]

docs/en/latest/plugins/kafka-proxy.md

@@ -0,0 +1,80 @@
+---
+title: kafka-proxy
+keywords:
+  - APISIX
+  - Plugin
+  - Kafka proxy
+description: This document contains information about the Apache APISIX kafka-proxy Plugin.
+---
+
+<!--
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+-->
+
+## Description
+
+The `kafka-proxy` plugin can be used to configure advanced parameters for the kafka upstream of Apache APISIX, such as SASL authentication.
+
+## Attributes
+
+| Name              | Type    | Required | Default | Valid values  | Description                        |
+|-------------------|---------|----------|---------|---------------|------------------------------------|
+| sasl              | object  | optional |         | {"username": "user", "password" :"pwd"} | SASL/PLAIN authentication configuration, when this configuration exists, turn on SASL authentication; this object will contain two parameters username and password, they must be configured. |
+| sasl.username     | string  | required |         |               | SASL/PLAIN authentication username |
+| sasl.password     | string  | required |         |               | SASL/PLAIN authentication password |
+
+:::note
+If SASL authentication is enabled, the `sasl.username` and `sasl.password` must be set.
+The current SASL authentication only supports PLAIN mode, which is the username password login method.
+:::
+
+## Example usage
+
+When we use scheme as the upstream of kafka, we can add kafka authentication configuration to it through this plugin.
+
+```shell
+curl -X PUT 'http://127.0.0.1:9080/apisix/admin/routes/r1' \
+    -H 'X-API-KEY: <api-key>' \
+    -H 'Content-Type: application/json' \
+    -d '{
+    "uri": "/kafka",
+    "plugins": {
+        "kafka-proxy": {
+            "sasl": {
+                "username": "user",
+                "password": "pwd"
+            }
+        }
+    },
+    "upstream": {
+        "nodes": {
+            "kafka-server1:9092": 1,
+            "kafka-server2:9092": 1,
+            "kafka-server3:9092": 1
+        },
+        "type": "none",
+        "scheme": "kafka"
+    }
+}'
+```
+
+Now, we can test it by connecting to the `/kafka` endpoint via websocket.
+
+## Disable Plugin
+
+To disable the `kafka-proxy` Plugin, you can delete the corresponding JSON configuration from the Plugin configuration. APISIX will automatically reload and you do not have to restart for this to take effect.

docs/en/latest/pubsub/kafka.md

@@ -92,3 +92,36 @@ curl -X PUT 'http://127.0.0.1:9080/apisix/admin/routes/kafka' \
 ```
 
 After configuring the route, you can use this feature.
+
+#### Enabling TLS and SASL/PLAIN authentication
+
+Simply turn on the `kafka-proxy` plugin on the created route and enable the Kafka TLS handshake and SASL authentication through the configuration, which can be found in the [plugin documentation](../../../en/latest/plugins/kafka-proxy.md).
+
+```shell
+curl -X PUT 'http://127.0.0.1:9080/apisix/admin/routes/kafka' \
+    -H 'X-API-KEY: <api-key>' \
+    -H 'Content-Type: application/json' \
+    -d '{
+    "uri": "/kafka",
+    "plugins": {
+        "kafka-proxy": {
+            "sasl": {
+                "username": "user",
+                "password": "pwd"
+            }
+        }
+    },
+    "upstream": {
+        "nodes": {
+            "kafka-server1:9092": 1,
+            "kafka-server2:9092": 1,
+            "kafka-server3:9092": 1
+        },
+        "type": "none",
+        "scheme": "kafka",
+        "tls": {
+            "verify": true
+        }
+    }
+}'
+```

t/admin/plugins.t

@@ -102,6 +102,7 @@ server-info
 traffic-split
 redirect
 response-rewrite
+kafka-proxy
 grpc-transcode
 grpc-web
 public-api