mirror of https://github.com/google/oss-fuzz.git
65 lines
1.7 KiB
Python
65 lines
1.7 KiB
Python
#!/usr/bin/python3
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# Copyright 2022 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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import sys
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import atheris
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import jwt
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import json
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from collections.abc import Mapping
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def test_decoding(data):
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"""Checks jwt decoding does not fail"""
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fdp = atheris.FuzzedDataProvider(data)
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s1 = fdp.ConsumeUnicodeNoSurrogates(1024)
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try:
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_ = jwt.decode(s1, algorithms=["HS256"])
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except jwt.exceptions.PyJWTError:
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pass
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def test_roundtrip(data):
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"""Check payload == decoded(encoded(payload))"""
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fdp = atheris.FuzzedDataProvider(data)
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try:
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payload = json.loads(fdp.ConsumeUnicodeNoSurrogates(1024))
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except:
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return
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# Only continue if correct type was created as payload.
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if not isinstance(payload, Mapping):
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return
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key = "fuzzing"
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jwt_message = jwt.encode(payload, key, algorithm="HS256")
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decoded_payload = jwt.decode(jwt_message, key, algorithms=["HS256"])
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assert decoded_payload == payload
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def TestOneInput(data):
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test_decoding(data)
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test_roundtrip(data)
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def main():
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atheris.instrument_all()
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atheris.Setup(sys.argv, TestOneInput, enable_python_coverage=True)
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atheris.Fuzz()
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if __name__ == "__main__":
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main()
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