oss-fuzz/projects/flask/fuzz_json.py

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#!/usr/bin/python3
# Copyright 2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import atheris
import sys
with atheris.instrument_imports():
import flask
from flask import Flask as _Flask
from werkzeug.http import parse_set_header
class FuzzFlask(_Flask):
testing = True
secret_key = "fuzz test key"
def TestOneInput(data):
fdp = atheris.FuzzedDataProvider(data)
app = FuzzFlask("flask_test", root_path=os.path.dirname(__file__))
app.config["DEBUG"] = True
app.config["TRAP_BAD_REQUEST_ERRORS"] = False
@app.route("/json", methods=["POST"])
def post_json():
flask.request.get_json()
return None
parse_set_header(fdp.ConsumeUnicode(sys.maxsize))
client = app.test_client()
try:
app.add_url_rule(
fdp.ConsumeUnicode(sys.maxsize),
endpoint = "randomendpoint"
)
except ValueError:
None
try:
client.post(
"/json",
data=fdp.ConsumeUnicode(sys.maxsize),
content_type="application/json"
)
except (TypeError, UnicodeEncodeError):
None
def main():
atheris.Setup(sys.argv, TestOneInput, enable_python_coverage=True)
atheris.Fuzz()
if __name__ == "__main__":
main()