anil.recoil.org
JSON web tokens in OCaml
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fuzz/dune
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fuzz/dune
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; Crowbar fuzz testing for jsonwt
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;
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; To run: dune exec ocaml-jsonwt/fuzz/fuzz_jsonwt.exe
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; With AFL: afl-fuzz -i fuzz/corpus -o fuzz/findings -- ./_build/default/ocaml-jsonwt/fuzz/fuzz_jsonwt.exe @@
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(executable
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(name fuzz_jsonwt)
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(modules fuzz_jsonwt)
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(libraries jsonwt crowbar))
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(rule
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(alias fuzz)
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(deps fuzz_jsonwt.exe)
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(action
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(run %{exe:fuzz_jsonwt.exe})))
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fuzz/fuzz_jsonwt.ml
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fuzz/fuzz_jsonwt.ml
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(*---------------------------------------------------------------------------
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Copyright (c) 2025 Thomas Gazagnaire. All rights reserved.
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SPDX-License-Identifier: MIT
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---------------------------------------------------------------------------*)
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(* Crowbar-based fuzz testing for JWT parsing *)
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open Crowbar
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(* Test that JWT parsing never crashes on arbitrary input *)
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let test_parse_no_crash input =
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let _ = Jsonwt.parse input in
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()
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(* Test that JWT parsing in unsafe mode never crashes *)
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let test_parse_unsafe_no_crash input =
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let _ = Jsonwt.parse_unsafe input in
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()
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(* Test that nested JWT parsing never crashes *)
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let test_parse_nested_no_crash input =
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let _ = Jsonwt.parse_nested input in
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()
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(* Test header parsing never crashes *)
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let test_header_parse_no_crash input =
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let _ = Jsonwt.Header.of_json input in
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()
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(* Test claims parsing never crashes *)
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let test_claims_parse_no_crash input =
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let _ = Jsonwt.Claims.of_json input in
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()
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(* Test JWK parsing never crashes *)
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let test_jwk_parse_no_crash input =
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let _ = Jsonwt.Jwk.of_json input in
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()
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(* Test algorithm parsing never crashes *)
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let test_algorithm_parse_no_crash input =
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let _ = Jsonwt.Algorithm.of_string input in
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()
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(* Test base64url-like inputs (dots are JWT separators) *)
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let test_jwt_structure input1 input2 input3 =
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let token = input1 ^ "." ^ input2 ^ "." ^ input3 in
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let _ = Jsonwt.parse token in
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()
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(* Test error printing never crashes *)
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let () =
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let errors =
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[
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Jsonwt.Invalid_json "test";
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Jsonwt.Invalid_base64url "test";
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Jsonwt.Invalid_structure "test";
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Jsonwt.Invalid_header "test";
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Jsonwt.Invalid_claims "test";
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Jsonwt.Invalid_uri "test";
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Jsonwt.Duplicate_claim "test";
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Jsonwt.Unsupported_algorithm "test";
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Jsonwt.Algorithm_not_allowed "test";
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Jsonwt.Signature_mismatch;
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Jsonwt.Token_expired;
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Jsonwt.Token_not_yet_valid;
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Jsonwt.Invalid_issuer;
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Jsonwt.Invalid_audience;
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Jsonwt.Key_type_mismatch "test";
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Jsonwt.Unsecured_not_allowed;
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Jsonwt.Nesting_too_deep;
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]
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in
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List.iter
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(fun e ->
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let _ = Format.asprintf "%a" Jsonwt.pp_error e in
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let _ = Jsonwt.error_to_string e in
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())
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errors
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let () =
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add_test ~name:"jwt: parse no crash" [ bytes ] test_parse_no_crash;
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add_test ~name:"jwt: parse_unsafe no crash" [ bytes ]
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test_parse_unsafe_no_crash;
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add_test ~name:"jwt: parse_nested no crash" [ bytes ]
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test_parse_nested_no_crash;
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add_test ~name:"jwt: header parse no crash" [ bytes ]
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test_header_parse_no_crash;
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add_test ~name:"jwt: claims parse no crash" [ bytes ]
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test_claims_parse_no_crash;
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add_test ~name:"jwt: jwk parse no crash" [ bytes ] test_jwk_parse_no_crash;
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add_test ~name:"jwt: algorithm parse no crash" [ bytes ]
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test_algorithm_parse_no_crash;
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add_test ~name:"jwt: structured input" [ bytes; bytes; bytes ]
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test_jwt_structure