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validation: restrict maximum number of errors to 100 by default #3283

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merged 1 commit into from Oct 1, 2021
Merged

validation: restrict maximum number of errors to 100 by default #3283

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10 changes: 8 additions & 2 deletions src/validation/validate.ts
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Expand Up @@ -28,18 +28,24 @@ import { SDLValidationContext, ValidationContext } from './ValidationContext';
* (see the language/visitor API). Visitor methods are expected to return
* GraphQLErrors, or Arrays of GraphQLErrors when invalid.
*
* Validate will stop validation after a `maxErrors` limit has been reached.
* Attackers can send pathologically invalid queries to induce a DoS attack,
* so by default `maxErrors` set to 100 errors.
*
* Optionally a custom TypeInfo instance may be provided. If not provided, one
* will be created from the provided schema.
*/
export function validate(
schema: GraphQLSchema,
documentAST: DocumentNode,
rules: ReadonlyArray<ValidationRule> = specifiedRules,
options: { maxErrors?: number } = { maxErrors: undefined },
options?: { maxErrors?: number },

/** @deprecated will be removed in 17.0.0 */
typeInfo: TypeInfo = new TypeInfo(schema),
): ReadonlyArray<GraphQLError> {
const maxErrors = options?.maxErrors ?? 100;

devAssert(documentAST, 'Must provide document.');
// If the schema used for validation is invalid, throw an error.
assertValidSchema(schema);
Expand All @@ -51,7 +57,7 @@ export function validate(
documentAST,
typeInfo,
(error) => {
if (options.maxErrors != null && errors.length >= options.maxErrors) {
if (errors.length >= maxErrors) {
errors.push(
new GraphQLError(
'Too many validation errors, error limit reached. Validation aborted.',
Expand Down