Version 4 supported
This version of Silverstripe CMS is still supported though will not receive any additional features. Go to documentation for the most recent stable version.

Security & best practices

Authentication
Ensure your GraphQL api is only accessible to provisioned users
Cross-Origin Resource Sharing (CORS)
Ensure that requests to your API come from a whitelist of origins
CSRF protection
Protect destructive actions from cross-site request forgery
Strict HTTP method checking
Ensure requests are GET or POST
Recursive or complex queries
Protecting against potentially malicious queries

Recursive or complex queries

GraphQL schemas can contain recursive types and circular dependencies. Recursive or overly complex queries can take up a lot of resources, and could have a high impact on server performance and even result in a denial of service if not handled carefully.

Before parsing queries, if a query is found to have more than 500 nodes, it is rejected. While executing queries there is a default query depth limit of 15 for all schemas with no complexity limit.

You can customise the node limit and query depth and complexity limits by setting the following configuration:

# app/_config/graphql.yml
---
After: 'graphql-schema-global'
---
SilverStripe\GraphQL\Schema\Schema:
  schemas:
    '*':
      config:
        max_query_nodes: 250 # default 500
        max_query_depth: 20 # default 15
        max_query_complexity: 100 # default unlimited

For calculating the query complexity, every field in the query gets a default score 1 (including ObjectType nodes). Total complexity of the query is the sum of all field scores.

You can also configure these settings for individual schemas. This allows you to fine-tune the security of your custom public-facing schema without affecting the security of the schema used in the CMS. To do so, either replace '*' with the name of your schema in the YAML configuration above, or set the values under the config key for your schema using preferred file structure as defined in configuring your schema. For example:

# app/_graphql/config.yml
max_query_nodes: 250
max_query_depth: 20
max_query_complexity: 100

Further reading

Authentication
Ensure your GraphQL api is only accessible to provisioned users
Cross-Origin Resource Sharing (CORS)
Ensure that requests to your API come from a whitelist of origins
CSRF protection
Protect destructive actions from cross-site request forgery
Strict HTTP method checking
Ensure requests are GET or POST
Recursive or complex queries
Protecting against potentially malicious queries