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/*
* 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.
*/
package org.apache.kafka.server.authorizer;
import org.apache.kafka.common.Configurable;
import org.apache.kafka.common.Endpoint;
import org.apache.kafka.common.acl.AccessControlEntryFilter;
import org.apache.kafka.common.acl.AclBinding;
import org.apache.kafka.common.acl.AclBindingFilter;
import org.apache.kafka.common.acl.AclOperation;
import org.apache.kafka.common.acl.AclPermissionType;
import org.apache.kafka.common.annotation.InterfaceStability;
import org.apache.kafka.common.resource.PatternType;
import org.apache.kafka.common.resource.ResourcePattern;
import org.apache.kafka.common.resource.ResourcePatternFilter;
import org.apache.kafka.common.resource.ResourceType;
import org.apache.kafka.common.security.auth.KafkaPrincipal;
import org.apache.kafka.common.utils.SecurityUtils;
import java.io.Closeable;
import java.util.Collections;
import java.util.EnumMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.CompletionStage;
/**
*
* Pluggable authorizer interface for Kafka brokers.
*
* Startup sequence in brokers:
*
* - Broker creates authorizer instance if configured in `authorizer.class.name`.
* - Broker configures and starts authorizer instance. Authorizer implementation starts loading its metadata.
* - Broker starts SocketServer to accept connections and process requests.
* - For each listener, SocketServer waits for authorization metadata to be available in the
* authorizer before accepting connections. The future returned by {@link #start(AuthorizerServerInfo)}
* for each listener must return only when authorizer is ready to authorize requests on the listener.
* - Broker accepts connections. For each connection, broker performs authentication and then accepts Kafka requests.
* For each request, broker invokes {@link #authorize(AuthorizableRequestContext, List)} to authorize
* actions performed by the request.
*
*
* Authorizer implementation class may optionally implement @{@link org.apache.kafka.common.Reconfigurable}
* to enable dynamic reconfiguration without restarting the broker.
*
* Threading model:
*
* - All authorizer operations including authorization and ACL updates must be thread-safe.
* - ACL update methods are asynchronous. Implementations with low update latency may return a
* completed future using {@link java.util.concurrent.CompletableFuture#completedFuture(Object)}.
* This ensures that the request will be handled synchronously by the caller without using a
* purgatory to wait for the result. If ACL updates require remote communication which may block,
* return a future that is completed asynchronously when the remote operation completes. This enables
* the caller to process other requests on the request threads without blocking.
* - Any threads or thread pools used for processing remote operations asynchronously can be started during
* {@link #start(AuthorizerServerInfo)}. These threads must be shutdown during {@link Authorizer#close()}.
*
*
*/
@InterfaceStability.Evolving
public interface Authorizer extends Configurable, Closeable {
/**
* Starts loading authorization metadata and returns futures that can be used to wait until
* metadata for authorizing requests on each listener is available. Each listener will be
* started only after its metadata is available and authorizer is ready to start authorizing
* requests on that listener.
*
* @param serverInfo Metadata for the broker including broker id and listener endpoints
* @return CompletionStage for each endpoint that completes when authorizer is ready to
* start authorizing requests on that listener.
*/
Map> start(AuthorizerServerInfo serverInfo);
/**
* Authorizes the specified action. Additional metadata for the action is specified
* in `requestContext`.
*
* This is a synchronous API designed for use with locally cached ACLs. Since this method is invoked on the
* request thread while processing each request, implementations of this method should avoid time-consuming
* remote communication that may block request threads.
*
* @param requestContext Request context including request type, security protocol and listener name
* @param actions Actions being authorized including resource and operation for each action
* @return List of authorization results for each action in the same order as the provided actions
*/
List authorize(AuthorizableRequestContext requestContext, List actions);
/**
* Creates new ACL bindings.
*
* This is an asynchronous API that enables the caller to avoid blocking during the update. Implementations of this
* API can return completed futures using {@link java.util.concurrent.CompletableFuture#completedFuture(Object)}
* to process the update synchronously on the request thread.
*
* @param requestContext Request context if the ACL is being created by a broker to handle
* a client request to create ACLs. This may be null if ACLs are created directly in ZooKeeper
* using AclCommand.
* @param aclBindings ACL bindings to create
*
* @return Create result for each ACL binding in the same order as in the input list. Each result
* is returned as a CompletionStage that completes when the result is available.
*/
List> createAcls(AuthorizableRequestContext requestContext, List aclBindings);
/**
* Deletes all ACL bindings that match the provided filters.
*
* This is an asynchronous API that enables the caller to avoid blocking during the update. Implementations of this
* API can return completed futures using {@link java.util.concurrent.CompletableFuture#completedFuture(Object)}
* to process the update synchronously on the request thread.
*
* Refer to the authorizer implementation docs for details on concurrent update guarantees.
*
* @param requestContext Request context if the ACL is being deleted by a broker to handle
* a client request to delete ACLs. This may be null if ACLs are deleted directly in ZooKeeper
* using AclCommand.
* @param aclBindingFilters Filters to match ACL bindings that are to be deleted
*
* @return Delete result for each filter in the same order as in the input list.
* Each result indicates which ACL bindings were actually deleted as well as any
* bindings that matched but could not be deleted. Each result is returned as a
* CompletionStage that completes when the result is available.
*/
List> deleteAcls(AuthorizableRequestContext requestContext, List aclBindingFilters);
/**
* Returns ACL bindings which match the provided filter.
*
* This is a synchronous API designed for use with locally cached ACLs. This method is invoked on the request
* thread while processing DescribeAcls requests and should avoid time-consuming remote communication that may
* block request threads.
*
* @return Iterator for ACL bindings, which may be populated lazily.
*/
Iterable acls(AclBindingFilter filter);
/**
* Get the current number of ACLs, for the purpose of metrics. Authorizers that don't implement this function
* will simply return -1.
*/
default int aclCount() {
return -1;
}
/**
* Check if the caller is authorized to perform the given ACL operation on at least one
* resource of the given type.
*
* Custom authorizer implementations should consider overriding this default implementation because:
* 1. The default implementation iterates all AclBindings multiple times, without any caching
* by principal, host, operation, permission types, and resource types. More efficient
* implementations may be added in custom authorizers that directly access cached entries.
* 2. The default implementation cannot integrate with any audit logging included in the
* authorizer implementation.
* 3. The default implementation does not support any custom authorizer configs or other access
* rules apart from ACLs.
*
* @param requestContext Request context including request resourceType, security protocol and listener name
* @param op The ACL operation to check
* @param resourceType The resource type to check
* @return Return {@link AuthorizationResult#ALLOWED} if the caller is authorized
* to perform the given ACL operation on at least one resource of the
* given type. Return {@link AuthorizationResult#DENIED} otherwise.
*/
default AuthorizationResult authorizeByResourceType(AuthorizableRequestContext requestContext, AclOperation op, ResourceType resourceType) {
SecurityUtils.authorizeByResourceTypeCheckArgs(op, resourceType);
// Check a hard-coded name to ensure that super users are granted
// access regardless of DENY ACLs.
if (authorize(requestContext, Collections.singletonList(new Action(
op, new ResourcePattern(resourceType, "hardcode", PatternType.LITERAL),
0, true, false)))
.get(0) == AuthorizationResult.ALLOWED) {
return AuthorizationResult.ALLOWED;
}
// Filter out all the resource pattern corresponding to the RequestContext,
// AclOperation, and ResourceType
ResourcePatternFilter resourceTypeFilter = new ResourcePatternFilter(
resourceType, null, PatternType.ANY);
AclBindingFilter aclFilter = new AclBindingFilter(
resourceTypeFilter, AccessControlEntryFilter.ANY);
EnumMap> denyPatterns =
new EnumMap>(PatternType.class) {{
put(PatternType.LITERAL, new HashSet<>());
put(PatternType.PREFIXED, new HashSet<>());
}};
EnumMap> allowPatterns =
new EnumMap>(PatternType.class) {{
put(PatternType.LITERAL, new HashSet<>());
put(PatternType.PREFIXED, new HashSet<>());
}};
boolean hasWildCardAllow = false;
KafkaPrincipal principal = new KafkaPrincipal(
requestContext.principal().getPrincipalType(),
requestContext.principal().getName());
String hostAddr = requestContext.clientAddress().getHostAddress();
for (AclBinding binding : acls(aclFilter)) {
if (!binding.entry().host().equals(hostAddr) && !binding.entry().host().equals("*"))
continue;
if (!SecurityUtils.parseKafkaPrincipal(binding.entry().principal()).equals(principal)
&& !binding.entry().principal().equals("User:*"))
continue;
if (binding.entry().operation() != op
&& binding.entry().operation() != AclOperation.ALL)
continue;
if (binding.entry().permissionType() == AclPermissionType.DENY) {
switch (binding.pattern().patternType()) {
case LITERAL:
// If wildcard deny exists, return deny directly
if (binding.pattern().name().equals(ResourcePattern.WILDCARD_RESOURCE))
return AuthorizationResult.DENIED;
denyPatterns.get(PatternType.LITERAL).add(binding.pattern().name());
break;
case PREFIXED:
denyPatterns.get(PatternType.PREFIXED).add(binding.pattern().name());
break;
default:
}
continue;
}
if (binding.entry().permissionType() != AclPermissionType.ALLOW)
continue;
switch (binding.pattern().patternType()) {
case LITERAL:
if (binding.pattern().name().equals(ResourcePattern.WILDCARD_RESOURCE)) {
hasWildCardAllow = true;
continue;
}
allowPatterns.get(PatternType.LITERAL).add(binding.pattern().name());
break;
case PREFIXED:
allowPatterns.get(PatternType.PREFIXED).add(binding.pattern().name());
break;
default:
}
}
if (hasWildCardAllow) {
return AuthorizationResult.ALLOWED;
}
// For any literal allowed, if there's no dominant literal and prefix denied, return allow.
// For any prefix allowed, if there's no dominant prefix denied, return allow.
for (Map.Entry> entry : allowPatterns.entrySet()) {
for (String allowStr : entry.getValue()) {
if (entry.getKey() == PatternType.LITERAL
&& denyPatterns.get(PatternType.LITERAL).contains(allowStr))
continue;
StringBuilder sb = new StringBuilder();
boolean hasDominatedDeny = false;
for (char ch : allowStr.toCharArray()) {
sb.append(ch);
if (denyPatterns.get(PatternType.PREFIXED).contains(sb.toString())) {
hasDominatedDeny = true;
break;
}
}
if (!hasDominatedDeny)
return AuthorizationResult.ALLOWED;
}
}
return AuthorizationResult.DENIED;
}
}