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Attribute based access control provider
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/*
* Copyright (c) 2018, 2023 Oracle and/or its affiliates.
*
* Licensed 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 io.helidon.security.providers.abac;
import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.ServiceLoader;
import java.util.Set;
import java.util.stream.Collectors;
import io.helidon.common.Errors;
import io.helidon.common.HelidonServiceLoader;
import io.helidon.common.config.Config;
import io.helidon.config.metadata.Configured;
import io.helidon.config.metadata.ConfiguredOption;
import io.helidon.security.AuthorizationResponse;
import io.helidon.security.EndpointConfig;
import io.helidon.security.ProviderRequest;
import io.helidon.security.SecurityLevel;
import io.helidon.security.SecurityResponse;
import io.helidon.security.providers.abac.spi.AbacValidator;
import io.helidon.security.providers.abac.spi.AbacValidatorService;
import io.helidon.security.spi.AuthorizationProvider;
import io.helidon.security.spi.SecurityProvider;
import jakarta.annotation.security.DenyAll;
import jakarta.annotation.security.PermitAll;
import jakarta.annotation.security.RolesAllowed;
/**
* Attribute based access control (ABAC) provider.
* This provider gathers all attributes to be validated on endpoint and makes sure they are all validated as expected during
* authorization process.
* Each attribute to be validated must have a {@link AbacValidator} implemented.
*
* @see #builder()
* @see #create(Config)
*/
public final class AbacProvider implements AuthorizationProvider {
private final List> validators = new ArrayList<>();
private final Set> supportedAnnotations;
private final Set supportedConfigKeys;
private final Set> supportedCustomObjects;
private final boolean failOnUnvalidated;
private final boolean failIfNoneValidated;
private AbacProvider(Builder builder) {
HelidonServiceLoader services =
HelidonServiceLoader.create(ServiceLoader.load(AbacValidatorService.class));
for (AbacValidatorService service : services) {
validators.add(service.instantiate(builder.config.get(service.configKey())));
}
this.validators.addAll(builder.validators);
Set> annotations = new HashSet<>();
Set configKeys = new HashSet<>();
Set> customObjects = new HashSet<>();
validators.forEach(v -> {
annotations.addAll(v.supportedAnnotations());
configKeys.add(v.configKey());
customObjects.add(v.configClass());
});
this.supportedAnnotations = Collections.unmodifiableSet(annotations);
this.supportedConfigKeys = Collections.unmodifiableSet(configKeys);
this.supportedCustomObjects = Collections.unmodifiableSet(customObjects);
this.failOnUnvalidated = builder.failOnUnvalidated;
this.failIfNoneValidated = builder.failIfNoneValidated;
}
/**
* Creates a fluent API builder to build new instances of this class.
*
* @return a new builder instance
*/
public static Builder builder() {
return new Builder();
}
/**
* Creates a new provider instance from configuration.
*
* @param config configuration
* @return ABAC provider instantiated from config
*/
public static AbacProvider create(Config config) {
return builder().config(config).build();
}
/**
* Creates a new provider instance with default configuration.
*
* @return ABAC provider
*/
public static AbacProvider create() {
return builder().build();
}
@Override
public Collection> supportedAnnotations() {
return supportedAnnotations;
}
@Override
public AuthorizationResponse authorize(ProviderRequest providerRequest) {
//let's find attributes to be validated
Errors.Collector collector = Errors.collector();
List attributes = new ArrayList<>();
EndpointConfig epConfig = providerRequest.endpointConfig();
// list all "Attribute" annotations and make sure we support them
validateAnnotations(epConfig, collector);
// list all children of abac config and make sure one of the AbacValidators supports them
validateConfig(epConfig, collector);
// list all custom objects and check those that implement AttributeConfig and ...
validateCustom(epConfig, collector);
Optional abacConfig = epConfig.config(AbacProviderService.PROVIDER_CONFIG_KEY);
for (var validator : validators) {
// order of preference - explicit class, configuration, annotation
Class configClass = validator.configClass();
String configKey = validator.configKey();
Collection> annotations = validator.supportedAnnotations();
Optional customObject = epConfig.instance(configClass);
if (customObject.isPresent()) {
attributes.add(new RuntimeAttribute(validator, customObject.get()));
} else {
// only configure this validator if its config key exists
// or it has a supported annotation
abacConfig.flatMap(it -> it.get(configKey).asNode().asOptional())
.ifPresentOrElse(attribConfig -> {
attributes.add(new RuntimeAttribute(validator, validator.fromConfig(attribConfig)));
},
() -> {
List annotationConfig = new ArrayList<>();
for (SecurityLevel securityLevel : epConfig.securityLevels()) {
for (Class annotation : annotations) {
List list = securityLevel
.combineAnnotations(annotation,
EndpointConfig.AnnotationScope.values());
annotationConfig.addAll(list);
}
}
if (!annotationConfig.isEmpty()) {
attributes.add(new RuntimeAttribute(validator,
validator.fromAnnotations(epConfig)));
}
});
}
}
for (RuntimeAttribute attribute : attributes) {
validate(attribute.getValidator(), attribute.getConfig(), collector, providerRequest);
}
Errors errors = collector.collect();
if (errors.isValid()) {
return AuthorizationResponse.permit();
}
return AuthorizationResponse.builder()
.status(SecurityResponse.SecurityStatus.FAILURE)
.description(errors.toString())
.build();
}
@SuppressWarnings("unchecked")
private , B extends AbacValidatorConfig> void validate(A validator,
AbacValidatorConfig config,
Errors.Collector collector,
ProviderRequest context) {
validator.validate((B) config, collector, context);
}
private void validateCustom(EndpointConfig epConfig, Errors.Collector collector) {
epConfig.instanceKeys()
.forEach(clazz -> {
int attributes = 0;
int unsupported = 0;
List unsupportedClasses = new LinkedList<>();
if (AbacValidatorConfig.class.isInstance(epConfig.instance(clazz))) {
attributes++;
if (!supportedCustomObjects.contains(clazz)) {
unsupported++;
unsupportedClasses.add(clazz.getName());
}
}
//evaluate that we can continue
boolean fail = false;
if (unsupported != 0) {
if (unsupported == attributes && failIfNoneValidated) {
fail = true;
} else if (failOnUnvalidated) {
fail = true;
}
if (fail) {
for (String key : unsupportedClasses) {
collector.fatal(this,
key + " custom object is not supported.");
}
collector.fatal(this, "Supported custom objects: " + supportedCustomObjects);
}
}
});
}
private void validateConfig(EndpointConfig config, Errors.Collector collector) {
config.config(AbacProviderService.PROVIDER_CONFIG_KEY)
.ifPresent(abacConfig -> validateAbacConfig(abacConfig, collector));
}
private void validateAbacConfig(Config abacConfig, Errors.Collector collector) {
// we need to iterate first level subkeys to see if they are supported
List keys = abacConfig.asNodeList()
.orElseGet(List::of)
.stream()
.map(Config::name)
.collect(Collectors.toList());
Set uniqueKeys = new HashSet<>(keys);
if (uniqueKeys.size() != keys.size()) {
collector.fatal(keys, "There are duplicit keys under \"abac\" node in configuration.");
}
int attributes = 0;
int unsupported = 0;
List unsupportedKeys = new LinkedList<>();
for (String key : uniqueKeys) {
attributes++;
if (!supportedConfigKeys.contains(key)) {
unsupported++;
unsupportedKeys.add(key);
}
}
//evaluate that we can continue
boolean fail = false;
if (unsupported != 0) {
if ((unsupported == attributes) && failIfNoneValidated) {
fail = true;
} else if (failOnUnvalidated) {
fail = true;
}
if (fail) {
for (String key : unsupportedKeys) {
collector.fatal(this,
"\"" + key + "\" ABAC attribute config key is not supported.");
}
collector.fatal(this, "Supported ABAC config keys: " + supportedConfigKeys);
}
}
}
private void validateAnnotations(EndpointConfig epConfig, Errors.Collector collector) {
// list all annotations that are marked as Attribute and make sure some AbacValidator supports them
for (SecurityLevel securityLevel : epConfig.securityLevels()) {
int attributeAnnotations = 0;
int unsupported = 0;
List unsupportedClassNames = new LinkedList<>();
Map, List> allAnnotations = securityLevel.allAnnotations();
for (Class type : allAnnotations.keySet()) {
AbacAnnotation abacAnnotation = type.getAnnotation(AbacAnnotation.class);
if (null != abacAnnotation || isSupportedAnnotation(type)) {
attributeAnnotations++;
if (!supportedAnnotations.contains(type)) {
unsupported++;
unsupportedClassNames.add(type.getName());
}
}
}
//evaluate that we can continue
if (unsupported != 0) {
boolean fail = failOnUnvalidated;
if (unsupported == attributeAnnotations && failIfNoneValidated) {
fail = true;
}
if (fail) {
for (String unsupportedClassName : unsupportedClassNames) {
collector.fatal(this,
unsupportedClassName + " attribute annotation is not supported.");
}
collector.fatal(this, "Supported annotations: " + supportedAnnotations);
}
}
}
}
private boolean isSupportedAnnotation(Class type) {
return RolesAllowed.class.equals(type)
|| PermitAll.class.equals(type)
|| DenyAll.class.equals(type);
}
/**
* A fluent API builder for {@link AbacProvider}.
*/
@Configured(prefix = AbacProviderService.PROVIDER_CONFIG_KEY,
description = "Attribute Based Access Control provider",
provides = {SecurityProvider.class, AuthorizationProvider.class})
public static final class Builder implements io.helidon.common.Builder {
private final List> validators = new ArrayList<>();
private Config config = Config.empty();
private boolean failOnUnvalidated = true;
private boolean failIfNoneValidated = true;
private Builder() {
}
@Override
public AbacProvider build() {
return new AbacProvider(this);
}
/**
* Add an explicit (e.g. not configurable automatically from a java service) attribute validator.
*
* @param validator validator to add
* @return updated builder instance
* @see AbacValidatorService
*/
public Builder addValidator(AbacValidator validator) {
this.validators.add(validator);
return this;
}
/**
* Configuration to use for validator instances.
* This builder is NOT updated from the provided config, use {@link #config(Config)} to update this builder.
*
* @param config configuration
* @return updated builder instance
*/
public Builder configuration(Config config) {
this.config = config;
return this;
}
/**
* Whether to fail if any attribute is left unvalidated.
*
* @param failOnUnvalidated true for failure on unvalidated, false if it is OK to fail some of the validations
* @return updated builder instance
*/
@ConfiguredOption("true")
public Builder failOnUnvalidated(boolean failOnUnvalidated) {
this.failOnUnvalidated = failOnUnvalidated;
return this;
}
/**
* Whether to fail if NONE of the attributes is validated.
*
* @param failIfNoneValidated true for failure on unvalidated, false if it is OK not to validate any attribute
* @return updated builder instance
*/
@ConfiguredOption("true")
public Builder failIfNoneValidated(boolean failIfNoneValidated) {
this.failIfNoneValidated = failIfNoneValidated;
return this;
}
/**
* Update builder from configuration and set the config to {@link #configuration(io.helidon.config.Config)}.
*
* @param config configuration placed on the key of this provider
* @return updated builder instance
*/
public Builder config(Config config) {
configuration(config);
config.get("fail-on-unvalidated").asBoolean().ifPresent(this::failOnUnvalidated);
config.get("fail-if-none-validated").asBoolean().ifPresent(this::failIfNoneValidated);
return this;
}
}
}