Youtube burp suite
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We need non-persisted queries going through Burp Suite to perform any detection. If the endpoint uses Automated Persisted Queries, proxy detection won't work.
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Caveats Doesn't Work with Automated Persisted Queries We discuss some caveats to this approach in the following section. You might notice a pattern whereby types are named relative to a field's parent. GetPosts(author: UnknownScalar): getPostsQueryType Here is a bit more complicated query that uses fragments. We followed the naming convention: field name + QueryType. The query company also needed a type where we set all the fields inside. In the example above, we assigned all the fields: ceo, name, and summary as a UnknownScalar type. In addition, a default scalar is defined in the schema as UnknownScalar, which is set as the field type whenever we don't know what the type is. I also wanted to give a big shout-out to AST explorer, a convenient tool for exploring how GraphQL queries and schemas are parsed.Įvery schema needs a defined Query type. As a result, we build a schema piece by piece that we can use in other tools. This process repeats with every GraphQL query that comes in. We then merge the newly created schema with the existing schema. We parse the GraphQL query into an AST and then create a schema based on it. This function takes an existing schema (basically empty at first) and the GraphQL query.
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This section describes our approach to building a GraphQL schema using queries sent through Burp Suite.Įvery GraphQL query that goes through Burp Suite gets sent to a query transformer function we built using graphql-java. The application had introspection enabled by default, but we just assumed that it didn't. We tested this against a local Go application called Traggo. The following video demonstrates GraphQuail building a schema for a GraphQL API with introspection disabled. As a result, GraphQuail shows all queries, arguments, and fields available for use within the API. The extension returns a fake response when it receives an introspection query. The extension also exposes GraphiQL and Voyager. This extension observes GraphQL API requests going through Burp and builds an internal GraphQL schema with each new query it sees. I included this functionality as part of our Burp Suite extension, GraphQuail.
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After some trial and error, I developed a practical approach to do just that. Having a GraphQL schema is a considerable improvement over working with raw HTTP requests. If I could do this, it would let anyone interact with a GraphQL API through GraphiQL even without having the schema. I wondered if it would be possible to passively observe traffic and piece together a GraphQL schema based on the queries that went through Burp Suite. Otherwise, you could point GraphiQL (or similar tools) to the GraphQL endpoint and have a fully populated schema to aid the construction of queries. This is only an issue if introspection is disabled. It also doesn't make much sense to test GraphQL endpoints by manipulating raw HTTP requests, and it's much more suitable to use tools like GraphiQL. You would need to spend a lot of time reviewing each request to determine queries, arguments, and fields. This isn't fun to look at, but more importantly, getting the coverage you need isn't feasible. Anyone who has reviewed a GraphQL API will have seen many requests that look something like this: One of the main obstacles of a black box GraphQL security review is getting good coverage of the exposed functionality.