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Delete template_test_harness.py
Please refer to /samples for documented example harnesses in python, rust, and c. See #1022
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"""
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template_test_harness.py
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Template which loads the context of a process into a Unicorn Engine,
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instance, loads a custom (mutated) inputs, and executes the
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desired code. Designed to be used in conjunction with one of the
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Unicorn Context Dumper scripts.
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Author:
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Nathan Voss <njvoss299@gmail.com>
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"""
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import argparse
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from unicorn import *
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from unicorn.x86_const import * # TODO: Set correct architecture here as necessary
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import unicorn_loader
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# Simple stand-in heap to prevent OS/kernel issues
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unicorn_heap = None
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# Start and end address of emulation
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START_ADDRESS = # TODO: Set start address here
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END_ADDRESS = # TODO: Set end address here
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"""
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Implement target-specific hooks in here.
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Stub out, skip past, and re-implement necessary functionality as appropriate
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"""
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def unicorn_hook_instruction(uc, address, size, user_data):
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# TODO: Setup hooks and handle anything you need to here
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# - For example, hook malloc/free/etc. and handle it internally
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pass
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#------------------------
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#---- Main test function
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def main():
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parser = argparse.ArgumentParser()
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parser.add_argument('context_dir', type=str, help="Directory containing process context")
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parser.add_argument('input_file', type=str, help="Path to the file containing the mutated input content")
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parser.add_argument('-d', '--debug', default=False, action="store_true", help="Dump trace info")
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args = parser.parse_args()
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print("Loading context from {}".format(args.context_dir))
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uc = unicorn_loader.AflUnicornEngine(args.context_dir, enable_trace=args.debug, debug_print=False)
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# Instantiate the hook function to avoid emulation errors
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global unicorn_heap
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unicorn_heap = unicorn_loader.UnicornSimpleHeap(uc, debug_print=True)
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uc.hook_add(UC_HOOK_CODE, unicorn_hook_instruction)
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# Execute 1 instruction just to startup the forkserver
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# NOTE: This instruction will be executed again later, so be sure that
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# there are no negative consequences to the overall execution state.
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# If there are, change the later call to emu_start to no re-execute
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# the first instruction.
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print("Starting the forkserver by executing 1 instruction")
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try:
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uc.emu_start(START_ADDRESS, 0, 0, count=1)
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except UcError as e:
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print("ERROR: Failed to execute a single instruction (error: {})!".format(e))
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return
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# Allocate a buffer and load a mutated input and put it into the right spot
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if args.input_file:
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print("Loading input content from {}".format(args.input_file))
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input_file = open(args.input_file, 'rb')
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input_content = input_file.read()
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input_file.close()
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# TODO: Apply constraints to mutated input here
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raise exceptions.NotImplementedError('No constraints on the mutated inputs have been set!')
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# Allocate a new buffer and put the input into it
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buf_addr = unicorn_heap.malloc(len(input_content))
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uc.mem_write(buf_addr, input_content)
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print("Allocated mutated input buffer @ 0x{0:016x}".format(buf_addr))
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# TODO: Set the input into the state so it will be handled
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raise exceptions.NotImplementedError('The mutated input was not loaded into the Unicorn state!')
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# Run the test
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print("Executing from 0x{0:016x} to 0x{1:016x}".format(START_ADDRESS, END_ADDRESS))
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try:
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result = uc.emu_start(START_ADDRESS, END_ADDRESS, timeout=0, count=0)
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except UcError as e:
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# If something went wrong during emulation a signal is raised to force this
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# script to crash in a way that AFL can detect ('uc.force_crash()' should be
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# called for any condition that you want AFL to treat as a crash).
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print("Execution failed with error: {}".format(e))
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uc.dump_regs()
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uc.force_crash(e)
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print("Final register state:")
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uc.dump_regs()
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print("Done.")
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if __name__ == "__main__":
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main()
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