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Validate
query field when creating roles
As of now the validation occurs at runtime when the query is being executed. I think the reason was due to the use of template queries which need runtime information as they need to be evaluated like user information. This commit adds validation for the role query but **not for the template query** as we do not have the runtime information required for evaluating the template query. This also corrects some tests and roles.yml files where the `query` field was not populated correctly. For validation, the query is evaluated (if not a template), parsed to build the `QueryBuilder` and verify if the query type is allowed. Closes #34252
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Yogesh Gaikwad
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Sep 5, 2019
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177 changes: 177 additions & 0 deletions
177
.../main/java/org/elasticsearch/xpack/core/security/authz/support/DLSRoleQueryValidator.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,177 @@ | ||
| /* | ||
| * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| * or more contributor license agreements. Licensed under the Elastic License; | ||
| * you may not use this file except in compliance with the Elastic License. | ||
| */ | ||
| package org.elasticsearch.xpack.core.security.authz.support; | ||
|
|
||
| import org.elasticsearch.ElasticsearchParseException; | ||
| import org.elasticsearch.common.Nullable; | ||
| import org.elasticsearch.common.ParsingException; | ||
| import org.elasticsearch.common.bytes.BytesReference; | ||
| import org.elasticsearch.common.xcontent.LoggingDeprecationHandler; | ||
| import org.elasticsearch.common.xcontent.NamedXContentRegistry; | ||
| import org.elasticsearch.common.xcontent.XContentFactory; | ||
| import org.elasticsearch.common.xcontent.XContentParseException; | ||
| import org.elasticsearch.common.xcontent.XContentParser; | ||
| import org.elasticsearch.index.query.AbstractQueryBuilder; | ||
| import org.elasticsearch.index.query.BoolQueryBuilder; | ||
| import org.elasticsearch.index.query.BoostingQueryBuilder; | ||
| import org.elasticsearch.index.query.ConstantScoreQueryBuilder; | ||
| import org.elasticsearch.index.query.GeoShapeQueryBuilder; | ||
| import org.elasticsearch.index.query.QueryBuilder; | ||
| import org.elasticsearch.index.query.TermsQueryBuilder; | ||
| import org.elasticsearch.index.query.functionscore.FunctionScoreQueryBuilder; | ||
| import org.elasticsearch.script.ScriptService; | ||
| import org.elasticsearch.xpack.core.security.authz.RoleDescriptor; | ||
| import org.elasticsearch.xpack.core.security.user.User; | ||
|
|
||
| import java.io.IOException; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
|
|
||
| /** | ||
| * This class helps in evaluating the query field if it is template | ||
| * and checking if the query type is allowed to be used in DLS role query. | ||
| */ | ||
| public class DLSRoleQueryValidator { | ||
|
|
||
| /** | ||
| * Evaluates the query field in the {@link RoleDescriptor.IndicesPrivileges} only if it is not a template | ||
| * query.<br> | ||
| * It parses the query and builds the {@link QueryBuilder}, also checks if the query type is supported in DLS role query. | ||
| * | ||
| * @param indicesPrivileges {@link RoleDescriptor.IndicesPrivileges} | ||
| * @param xContentRegistry {@link NamedXContentRegistry} for finding named queries | ||
| */ | ||
| public static void validateQueryField(RoleDescriptor.IndicesPrivileges[] indicesPrivileges, | ||
| NamedXContentRegistry xContentRegistry) { | ||
| if (indicesPrivileges != null) { | ||
| for (RoleDescriptor.IndicesPrivileges idp : indicesPrivileges) { | ||
| BytesReference query = idp.getQuery(); | ||
| if (query != null) { | ||
| if (isTemplateQuery(query, xContentRegistry)) { | ||
| // skip template query, this requires runtime information like 'User' information. | ||
| continue; | ||
| } | ||
|
|
||
| validateAndVerifyRoleQuery(query.utf8ToString(), xContentRegistry); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private static boolean isTemplateQuery(BytesReference query, NamedXContentRegistry xContentRegistry) { | ||
| try { | ||
| try (XContentParser parser = XContentFactory.xContent(query.utf8ToString()).createParser(xContentRegistry, | ||
| LoggingDeprecationHandler.INSTANCE, query.utf8ToString())) { | ||
| expectedToken(parser.nextToken(), parser, XContentParser.Token.START_OBJECT); | ||
| expectedToken(parser.nextToken(), parser, XContentParser.Token.FIELD_NAME); | ||
| String fieldName = parser.currentName(); | ||
| if ("template".equals(fieldName)) { | ||
| return true; | ||
| } | ||
| } | ||
| } catch (XContentParseException | IOException e) { | ||
| throw new ElasticsearchParseException("failed to parse field 'query' from the role descriptor", e); | ||
| } | ||
| return false; | ||
| } | ||
|
|
||
| private static void expectedToken(XContentParser.Token read, XContentParser parser, XContentParser.Token expected) { | ||
| if (read != expected) { | ||
| throw new XContentParseException(parser.getTokenLocation(), | ||
| "expected [" + expected + "] but found [" + read + "] instead"); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Evaluates the query if it is a template and then validates the query by parsing | ||
| * and building the {@link QueryBuilder}. It also checks if the query type is | ||
| * supported in DLS role query. | ||
| * | ||
| * @param query {@link BytesReference} query field from the role | ||
| * @param scriptService {@link ScriptService} used for evaluation of a template query | ||
| * @param xContentRegistry {@link NamedXContentRegistry} for finding named queries | ||
| * @param user {@link User} used when evaluation a template query | ||
| * @return {@link QueryBuilder} if the query is valid and allowed, in case {@link RoleDescriptor.IndicesPrivileges} | ||
| * * does not have a query field then it returns {@code null}. | ||
| */ | ||
| @Nullable | ||
| public static QueryBuilder validateAndVerifyRoleQuery(BytesReference query, ScriptService scriptService, | ||
| NamedXContentRegistry xContentRegistry, User user) { | ||
| QueryBuilder queryBuilder = null; | ||
| if (query != null) { | ||
| try { | ||
| String templateResult = SecurityQueryTemplateEvaluator.evaluateTemplate(query.utf8ToString(), scriptService, | ||
| user); | ||
| queryBuilder = validateAndVerifyRoleQuery(templateResult, xContentRegistry); | ||
| } catch (ElasticsearchParseException | ParsingException | XContentParseException | IOException e) { | ||
| throw new ElasticsearchParseException("failed to parse field 'query' from the role descriptor", e); | ||
| } | ||
| } | ||
| return queryBuilder; | ||
| } | ||
|
|
||
| private static QueryBuilder validateAndVerifyRoleQuery(String query, NamedXContentRegistry xContentRegistry) { | ||
| QueryBuilder queryBuilder = null; | ||
| if (query != null) { | ||
| try { | ||
| try (XContentParser parser = XContentFactory.xContent(query).createParser(xContentRegistry, | ||
| LoggingDeprecationHandler.INSTANCE, query)) { | ||
| queryBuilder = AbstractQueryBuilder.parseInnerQueryBuilder(parser); | ||
| verifyRoleQuery(queryBuilder); | ||
| } | ||
| } catch (ElasticsearchParseException | ParsingException | XContentParseException | IOException e) { | ||
| throw new ElasticsearchParseException("failed to parse field 'query' from the role descriptor", e); | ||
| } | ||
| } | ||
| return queryBuilder; | ||
| } | ||
|
|
||
| /** | ||
| * Checks whether the role query contains queries we know can't be used as DLS role query. | ||
| * | ||
| * @param queryBuilder {@link QueryBuilder} for given query | ||
| */ | ||
| public static void verifyRoleQuery(QueryBuilder queryBuilder) { | ||
| if (queryBuilder instanceof TermsQueryBuilder) { | ||
| TermsQueryBuilder termsQueryBuilder = (TermsQueryBuilder) queryBuilder; | ||
| if (termsQueryBuilder.termsLookup() != null) { | ||
| throw new IllegalArgumentException("terms query with terms lookup isn't supported as part of a role query"); | ||
| } | ||
| } else if (queryBuilder instanceof GeoShapeQueryBuilder) { | ||
| GeoShapeQueryBuilder geoShapeQueryBuilder = (GeoShapeQueryBuilder) queryBuilder; | ||
| if (geoShapeQueryBuilder.shape() == null) { | ||
| throw new IllegalArgumentException("geoshape query referring to indexed shapes isn't support as part of a role query"); | ||
| } | ||
| } else if (queryBuilder.getName().equals("percolate")) { | ||
| // actually only if percolate query is referring to an existing document then this is problematic, | ||
| // a normal percolate query does work. However we can't check that here as this query builder is inside | ||
| // another module. So we don't allow the entire percolate query. I don't think users would ever use | ||
| // a percolate query as role query, so this restriction shouldn't prohibit anyone from using dls. | ||
| throw new IllegalArgumentException("percolate query isn't support as part of a role query"); | ||
| } else if (queryBuilder.getName().equals("has_child")) { | ||
| throw new IllegalArgumentException("has_child query isn't support as part of a role query"); | ||
| } else if (queryBuilder.getName().equals("has_parent")) { | ||
| throw new IllegalArgumentException("has_parent query isn't support as part of a role query"); | ||
| } else if (queryBuilder instanceof BoolQueryBuilder) { | ||
| BoolQueryBuilder boolQueryBuilder = (BoolQueryBuilder) queryBuilder; | ||
| List<QueryBuilder> clauses = new ArrayList<>(); | ||
| clauses.addAll(boolQueryBuilder.filter()); | ||
| clauses.addAll(boolQueryBuilder.must()); | ||
| clauses.addAll(boolQueryBuilder.mustNot()); | ||
| clauses.addAll(boolQueryBuilder.should()); | ||
| for (QueryBuilder clause : clauses) { | ||
| verifyRoleQuery(clause); | ||
| } | ||
| } else if (queryBuilder instanceof ConstantScoreQueryBuilder) { | ||
| verifyRoleQuery(((ConstantScoreQueryBuilder) queryBuilder).innerQuery()); | ||
| } else if (queryBuilder instanceof FunctionScoreQueryBuilder) { | ||
| verifyRoleQuery(((FunctionScoreQueryBuilder) queryBuilder).query()); | ||
| } else if (queryBuilder instanceof BoostingQueryBuilder) { | ||
| verifyRoleQuery(((BoostingQueryBuilder) queryBuilder).negativeQuery()); | ||
| verifyRoleQuery(((BoostingQueryBuilder) queryBuilder).positiveQuery()); | ||
| } | ||
| } | ||
| } |
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