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Validate query
field when creating roles
#46275
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/* | ||
* 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; | ||
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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; | ||
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import java.io.IOException; | ||
import java.util.ArrayList; | ||
import java.util.List; | ||
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/** | ||
* This class helps in evaluating the query field if it is template | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. it evaluates non template queries also, right ? There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. So there are two validation methods one that validates query ( |
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* and checking if the query type is allowed to be used in DLS role query. | ||
*/ | ||
public class DLSRoleQueryValidator { | ||
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/** | ||
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* 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; | ||
} | ||
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validateAndVerifyRoleQuery(query.utf8ToString(), xContentRegistry); | ||
} | ||
} | ||
} | ||
} | ||
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private static boolean isTemplateQuery(BytesReference query, NamedXContentRegistry xContentRegistry) { | ||
try { | ||
try (XContentParser parser = XContentFactory.xContent(query.utf8ToString()).createParser(xContentRegistry, | ||
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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); | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. consider changing the error message here, we wouldn't trying parse the query. WDYT ? There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. changed the message here, Thank you. |
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} | ||
return false; | ||
} | ||
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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"); | ||
} | ||
} | ||
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/** | ||
* 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, | ||
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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; | ||
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} | ||
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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; | ||
} | ||
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/** | ||
* 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) { | ||
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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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If we really want this to be a random role then may this would be better as
But maybe that's overkill, I didn't really look at where we use this method.
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Since this was an IT testing put role, we were failing due to validation, earlier the query was invalid.
I don't think we need to create a random query here, the
createNewRandom
is being used in unit tests mostly. But if you feel that we should have a random query string generated then we can do something here. Thank you.