gunicorn: intial integration (#7921)

Create util fuzzer

projects/gunicorn/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 git clone https://github.com/benoitc/gunicorn
+WORKDIR gunicorn
+
+COPY build.sh fuzz_*.py $SRC/

projects/gunicorn/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.
+#
+################################################################################
+
+# Build and install project (using current CFLAGS, CXXFLAGS).
+pip3 install --upgrade pip
+pip3 install .
+
+for fuzzer in $(find $SRC -name 'fuzz_*.py'); do
+  compile_python_fuzzer $fuzzer
+done

projects/gunicorn/fuzz_util.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():
+    from gunicorn import util
+    from gunicorn.errors import AppImportError
+
+def TestInput(data):
+
+    fdp = atheris.FuzzedDataProvider(data)
+
+    util.is_ipv6(fdp.ConsumeString(100))
+    util.warn(fdp.ConsumeString(100))
+    util.split_request_uri(fdp.ConsumeString(100))
+
+    try:
+        util.parse_address(fdp.ConsumeString(100))
+    except RuntimeError as e:
+        if "is not a valid port number." not in str(e):
+            raise e
+
+    try:
+        util.http_date(fdp.ConsumeInt(50))
+    except OSError as e:
+        if "Value too large for defined data type" not in str(e):
+            raise e
+    except (OverflowError,ValueError) as e:
+        if "out of range" not in str(e):
+            raise e
+
+    try:
+        util.to_bytestring(fdp.ConsumeString(100))
+        util.to_bytestring(fdp.ConsumeString(100),'ascii')
+    except UnicodeEncodeError as e:
+        if "codec can't encode character" not in str(e):
+            raise e
+
+    try:
+        util.import_app(fdp.ConsumeString(100))
+    except (ValueError,ImportError,AppImportError) as e:
+        error_list = [
+             "Empty module name",
+             "No module",
+             "Failed to parse",
+             "Function reference",
+             "literal values",
+             "attribute name",
+             "find attribute",
+             "takes",
+             "inner",
+             "find application object",
+             "callable"
+        ]
+        expected_error = False
+        for error in error_list:
+            if error in str(e):
+                expected_error = True
+        if not expected_error:
+            raise e
+
+def main():
+    atheris.Setup(sys.argv, TestInput, enable_python_coverage=True)
+    atheris.Fuzz()
+
+if __name__ == "__main__":
+    main()

projects/gunicorn/project.yaml

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