pyjwt: initial integration (#8230)

projects/pyjwt/Dockerfile

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+# 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.
+#
+################################################################################
+
+FROM gcr.io/oss-fuzz-base/base-builder-python
+RUN apt-get update && apt-get install -y make autoconf automake libtool
+RUN git clone --depth 1 https://github.com/jpadilla/pyjwt
+WORKDIR pyjwt
+COPY build.sh *.py $SRC/

projects/pyjwt/build.sh

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+#!/bin/bash -eu
+# 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.
+#
+################################################################################
+
+pip3 install .
+for fuzzer in $(find $SRC -name 'fuzz_*.py'); do
+  compile_python_fuzzer $fuzzer
+done

projects/pyjwt/fuzz_jwt.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 os
+import sys
+import atheris
+
+import jwt
+import json
+from collections.abc import Mapping
+
+
+def test_decoding(data):
+    """Checks jwt decoding does not fail"""
+    fdp = atheris.FuzzedDataProvider(data)
+    s1 = fdp.ConsumeUnicodeNoSurrogates(1024)
+    try:
+        _ = jwt.decode(s1, algorithms=["HS256"])
+    except jwt.exceptions.PyJWTError:
+        pass
+
+
+def test_roundtrip(data):
+    """Check payload == decoded(encoded(payload))"""
+    fdp = atheris.FuzzedDataProvider(data)
+    try:
+        payload = json.loads(fdp.ConsumeUnicodeNoSurrogates(1024))
+    except:
+        return
+    # Only continue if correct type was created as payload.
+    if not isinstance(payload, Mapping): 
+        return
+
+    key = "fuzzing"
+    jwt_message = jwt.encode(payload, key, algorithm="HS256")
+    decoded_payload = jwt.decode(jwt_message, key, algorithms=["HS256"])
+    assert decoded_payload == payload 
+
+
+def TestOneInput(data):
+    test_decoding(data)
+    test_roundtrip(data)
+
+
+def main():
+    atheris.instrument_all()
+    atheris.Setup(sys.argv, TestOneInput, enable_python_coverage=True)
+    atheris.Fuzz()
+
+
+if __name__ == "__main__":
+    main()

projects/pyjwt/project.yaml

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+homepage: "https://github.com/jpadilla/pyjwt"
+language: python
+main_repo: "https://github.com/jpadilla/pyjwt"
+fuzzing_engines:
+- libfuzzer
+sanitizers:
+- address
+- undefined
+vendor_ccs:
+- david@adalogics.com
+- adam@adalogics.com
+- arthur.chan@adalogics.com