mirror of https://github.com/google/oss-fuzz.git
91 lines
2.6 KiB
Python
91 lines
2.6 KiB
Python
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#!/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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"""Fuzzer for Packetizer"""
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import os
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import sys
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import atheris
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from hashlib import sha1
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from cryptography.hazmat.backends import default_backend
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from cryptography.hazmat.primitives.ciphers import algorithms, Cipher, modes
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from paramiko import Message, Packetizer
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from paramiko.common import byte_chr, zero_byte, asbytes
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# Extract path of fuzzer so we can include loop.py
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if getattr(sys, 'frozen', False):
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app_path = os.path.dirname(sys.executable)
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elif __file__:
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app_path = os.path.dirname(__file__)
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else:
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raise Exception("Could not extract path needed to import loop.py")
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sys.path.append(app_path)
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from loop import LoopSocket
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def TestOneInput(data):
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fdp = atheris.FuzzedDataProvider(data)
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rsock = LoopSocket()
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wsock = LoopSocket()
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rsock.link(wsock)
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p = Packetizer(wsock)
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encryptor = Cipher(
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algorithms.AES(zero_byte * 16),
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modes.CBC(byte_chr(fdp.ConsumeIntInRange(0, 255)) * 16),
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backend=default_backend(),
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).encryptor()
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p.set_outbound_cipher(
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encryptor,
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16,
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sha1,
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12,
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byte_chr(fdp.ConsumeIntInRange(0, 255)) * 20
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)
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m = Message()
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# Messages need to be at least 16 bytes long, so we'll include
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# at least 16 items.
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for i in range(fdp.ConsumeIntInRange(16, 32)):
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op = fdp.ConsumeIntInRange(0,5)
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if op == 0:
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m.add(fdp.ConsumeUnicodeNoSurrogates(20))
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elif op == 1:
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m.add(fdp.ConsumeIntInRange(0, 4294967295))
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elif op == 2:
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m.add(fdp.ConsumeBool())
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elif op == 3:
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l1 = list()
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for i in range(1, 10):
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l1.append(fdp.ConsumeUnicodeNoSurrogates(20))
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m.add(l1)
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elif op == 4:
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m.add_bytes(fdp.ConsumeBytes(20))
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elif op == 5:
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m.add_byte(byte_chr(fdp.ConsumeIntInRange(0,255)))
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p.send_message(m)
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rsock.recv(sys.maxsize)
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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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