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Improve handling of nested fields in index reader wrappers (elastic#1…
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…18757)

This update enhances the handling of parent filters to ensure proper exclusion of child documents.
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@jimczi
jimczi committed Dec 18, 2024
1 parent 6ae803b commit c04ba2d
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Showing 4 changed files with 193 additions and 2 deletions.
5 changes: 5 additions & 0 deletions docs/changelog/118757.yaml
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@@ -0,0 +1,5 @@
pr: 118757
summary: Improve handling of nested fields in index reader wrappers
area: Authorization
type: enhancement
issues: []
4 changes: 4 additions & 0 deletions test/framework/src/main/java/org/elasticsearch/test/AbstractBuilderTestCase.java
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Expand Up @@ -233,6 +233,10 @@ protected static IndexSettings indexSettings() {
return serviceHolder.idxSettings;
}

protected static MapperService mapperService() {
return serviceHolder.mapperService;
}

protected static String expectedFieldName(String builderFieldName) {
return ALIAS_TO_CONCRETE_FIELD_NAME.getOrDefault(builderFieldName, builderFieldName);
}
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6 changes: 4 additions & 2 deletions ...main/java/org/elasticsearch/xpack/core/security/authz/permission/DocumentPermissions.java
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Expand Up @@ -159,15 +159,17 @@ private static void buildRoleQuery(
if (queryBuilder != null) {
failIfQueryUsesClient(queryBuilder, context);
Query roleQuery = context.toQuery(queryBuilder).query();
filter.add(roleQuery, SHOULD);
NestedLookup nestedLookup = context.nestedLookup();
if (nestedLookup != NestedLookup.EMPTY) {
if (nestedLookup == NestedLookup.EMPTY) {
filter.add(roleQuery, SHOULD);
} else {
NestedHelper nestedHelper = new NestedHelper(nestedLookup, context::isFieldMapped);
if (nestedHelper.mightMatchNestedDocs(roleQuery)) {
roleQuery = new BooleanQuery.Builder().add(roleQuery, FILTER)
.add(Queries.newNonNestedFilter(context.indexVersionCreated()), FILTER)
.build();
}
filter.add(roleQuery, SHOULD);
// If access is allowed on root doc then also access is allowed on all nested docs of that root document:
BitSetProducer rootDocs = context.bitsetFilter(Queries.newNonNestedFilter(context.indexVersionCreated()));
ToChildBlockJoinQuery includeNestedDocs = new ToChildBlockJoinQuery(roleQuery, rootDocs);
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180 changes: 180 additions & 0 deletions ...h/xpack/core/security/authz/accesscontrol/SecurityIndexReaderWrapperIntegrationTests.java
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Expand Up @@ -23,19 +23,24 @@
import org.apache.lucene.search.TotalHitCountCollectorManager;
import org.apache.lucene.store.Directory;
import org.elasticsearch.client.internal.Client;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.bytes.BytesArray;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.compress.CompressedXContent;
import org.elasticsearch.common.lucene.index.ElasticsearchDirectoryReader;
import org.elasticsearch.common.lucene.search.Queries;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.util.concurrent.ThreadContext;
import org.elasticsearch.index.IndexSettings;
import org.elasticsearch.index.mapper.FieldMapper;
import org.elasticsearch.index.mapper.KeywordFieldMapper.KeywordFieldType;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.index.mapper.MapperMetrics;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.mapper.Mapping;
import org.elasticsearch.index.mapper.MappingLookup;
import org.elasticsearch.index.mapper.MockFieldMapper;
import org.elasticsearch.index.mapper.SourceToParse;
import org.elasticsearch.index.query.ParsedQuery;
import org.elasticsearch.index.query.SearchExecutionContext;
import org.elasticsearch.index.query.TermsQueryBuilder;
Expand All @@ -45,13 +50,18 @@
import org.elasticsearch.search.internal.ContextIndexSearcher;
import org.elasticsearch.test.AbstractBuilderTestCase;
import org.elasticsearch.test.IndexSettingsModule;
import org.elasticsearch.xcontent.XContentBuilder;
import org.elasticsearch.xcontent.XContentFactory;
import org.elasticsearch.xcontent.XContentType;
import org.elasticsearch.xpack.core.security.SecurityContext;
import org.elasticsearch.xpack.core.security.authc.Authentication;
import org.elasticsearch.xpack.core.security.authc.AuthenticationTestHelper;
import org.elasticsearch.xpack.core.security.authc.support.AuthenticationContextSerializer;
import org.elasticsearch.xpack.core.security.authz.permission.DocumentPermissions;
import org.elasticsearch.xpack.core.security.authz.permission.FieldPermissions;

import java.io.IOException;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
Expand Down Expand Up @@ -340,6 +350,176 @@ protected IndicesAccessControl getIndicesAccessControl() {
directory.close();
}

@Override
protected void initializeAdditionalMappings(MapperService mapperService) throws IOException {
XContentBuilder builder = XContentFactory.jsonBuilder()
.startObject()
.startObject("properties")
.startObject("f1")
.field("type", "keyword")
.endObject()
.startObject("nested1")
.field("type", "nested")
.startObject("properties")
.startObject("field")
.field("type", "keyword")
.endObject()
.endObject()
.endObject()
.endObject()
.endObject();
mapperService.merge(
MapperService.SINGLE_MAPPING_NAME,
new CompressedXContent(Strings.toString(builder)),
MapperService.MergeReason.MAPPING_UPDATE
);
}

public void testDLSWithNestedDocs() throws Exception {
Directory directory = newDirectory();
try (
IndexWriter iw = new IndexWriter(
directory,
new IndexWriterConfig(new StandardAnalyzer()).setMergePolicy(NoMergePolicy.INSTANCE)
)
) {
var parser = mapperService().documentParser();
String doc = """
{
"f1": "value",
"nested1": [
{
"field": "0"
},
{
"field": "1"
},
{}
]
}
""";
var parsedDoc = parser.parseDocument(
new SourceToParse("0", new BytesArray(doc), XContentType.JSON),
mapperService().mappingLookup()
);
iw.addDocuments(parsedDoc.docs());

doc = """
{
"nested1": [
{
"field": "12"
},
{
"field": "13"
},
{}
]
}
""";
parsedDoc = parser.parseDocument(
new SourceToParse("1", new BytesArray(doc), XContentType.JSON),
mapperService().mappingLookup()
);
iw.addDocuments(parsedDoc.docs());

doc = """
{
"f1": "value",
"nested1": [
{
"field": "12"
},
{}
]
}
""";
parsedDoc = parser.parseDocument(
new SourceToParse("2", new BytesArray(doc), XContentType.JSON),
mapperService().mappingLookup()
);
iw.addDocuments(parsedDoc.docs());

doc = """
{
"nested1": [
{
"field": "12"
},
{}
]
}
""";
parsedDoc = parser.parseDocument(
new SourceToParse("3", new BytesArray(doc), XContentType.JSON),
mapperService().mappingLookup()
);
iw.addDocuments(parsedDoc.docs());

iw.commit();
}

DirectoryReader directoryReader = ElasticsearchDirectoryReader.wrap(
DirectoryReader.open(directory),
new ShardId(indexSettings().getIndex(), 0)
);
SearchExecutionContext context = createSearchExecutionContext(new IndexSearcher(directoryReader));

final ThreadContext threadContext = new ThreadContext(Settings.EMPTY);
final SecurityContext securityContext = new SecurityContext(Settings.EMPTY, threadContext);
final Authentication authentication = AuthenticationTestHelper.builder().build();
new AuthenticationContextSerializer().writeToContext(authentication, threadContext);

Set<BytesReference> queries = new HashSet<>();
queries.add(new BytesArray("{\"bool\": { \"must_not\": { \"exists\": { \"field\": \"f1\" } } } }"));
IndicesAccessControl.IndexAccessControl indexAccessControl = new IndicesAccessControl.IndexAccessControl(
FieldPermissions.DEFAULT,
DocumentPermissions.filteredBy(queries)
);

DocumentSubsetBitsetCache bitsetCache = new DocumentSubsetBitsetCache(Settings.EMPTY, Executors.newSingleThreadExecutor());

final MockLicenseState licenseState = mock(MockLicenseState.class);
when(licenseState.isAllowed(DOCUMENT_LEVEL_SECURITY_FEATURE)).thenReturn(true);
ScriptService scriptService = mock(ScriptService.class);
SecurityIndexReaderWrapper wrapper = new SecurityIndexReaderWrapper(
s -> context,
bitsetCache,
securityContext,
licenseState,
scriptService
) {

@Override
protected IndicesAccessControl getIndicesAccessControl() {
IndicesAccessControl indicesAccessControl = new IndicesAccessControl(
true,
singletonMap(indexSettings().getIndex().getName(), indexAccessControl)
);
return indicesAccessControl;
}
};

DirectoryReader wrappedDirectoryReader = wrapper.apply(directoryReader);
IndexSearcher indexSearcher = new ContextIndexSearcher(
wrappedDirectoryReader,
IndexSearcher.getDefaultSimilarity(),
IndexSearcher.getDefaultQueryCache(),
IndexSearcher.getDefaultQueryCachingPolicy(),
true
);

ScoreDoc[] hits = indexSearcher.search(new MatchAllDocsQuery(), 1000).scoreDocs;
assertThat(Arrays.stream(hits).map(h -> h.doc).collect(Collectors.toSet()), containsInAnyOrder(4, 5, 6, 7, 11, 12, 13));

hits = indexSearcher.search(Queries.newNonNestedFilter(context.indexVersionCreated()), 1000).scoreDocs;
assertThat(Arrays.stream(hits).map(h -> h.doc).collect(Collectors.toSet()), containsInAnyOrder(7, 13));

bitsetCache.close();
directoryReader.close();
directory.close();
}

private static MappingLookup createMappingLookup(List<MappedFieldType> concreteFields) {
List<FieldMapper> mappers = concreteFields.stream().map(MockFieldMapper::new).collect(Collectors.toList());
return MappingLookup.fromMappers(Mapping.EMPTY, mappers, emptyList());
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