ghidralib 0.2.0

A Pythonic Ghidra standard library

ghidralib

This library is an attempt to provide a Pythonic standard library for Ghidra.

The main goal is to make writing quick&dirty scripts actually quick, and not that dirty.

Installation

Just copy the ghidralib.py file to your ghidra_scripts directory. Later just from ghidralib import *.

Usage

Check out the documentation or official examples. A short demonstration of a basic ghidralib usage first:

1. Get all function instructions (similarly for basic blocks, low and high pcode, calls and xrefs):

print(Function("main").instructions)

For comparison, plain Ghidra equivalent:

function_manager = currentProgram.getFunctionManager()
symbol_table = currentProgram.getSymbolTable()
main = list(symbol_table.getSymbols('main'))[0].getAddress()
function = function_manager.getFunctionAt(main)
instructions = currentProgram.getListing().getInstructions(function.getBody(), True)
print(list(instructions))

2. You have a structure uint8_t *data; uint32_t len; at 0x1000 and you want to read it:

pos, len_bytes = get_u32(0x10000), get_u32(0x10000 + 4)
print(get_bytes(pos, len_bytes))

For comparison, plain Ghidra equivalent:

start_address = toAddr(0x10000)
pos = currentProgram.getMemory().getInt(start_address)
len_bytes = currentProgram.getMemory().getInt(start_address.add(4))
data = getBytes(toAddr(pos), len_bytes)
print(" ".join(chr(c % 256) for byte in data))  # signed bytes <3

3. Find all calls to a string deobfuscation function and get call parameters:

for call in Function("MyCustomCrypto").calls:
    ctx = call.infer_context()
    key, data = ctx["eax"], ctx["edx"]
    datalen = get_u32(data - 4)
    print(call.address, decode(get_bytes(data, datalen)))

For comparison, plain Ghidra equivalent:

Just joking! Too long to fit in this README.

You can also emulate a function call and read the result:

ctx = Function("GetFuncNameByHash").emulate(0x698766968)
print(ctx.read_cstring(ctx["eax"]))

4. Tons more QoL features:

DataType("_NT_TIB")  # Get a datatype by name
DataType.from_c("typedef void* HINTERNET;")  # Quickly parse structs and typedefs

func = Function("main")  # Work at various abstract levels
print(function.instructions)  # Get instructions...
print(function.basicblocks)  # ..basic blocks...
print(function.pcode)  # ...low pcode...
print(function.high_pcode)  # ...high pcode...
print(function.decompile())  # ...or decompile a whole function

for xref in Symbol("PTR_GetProcAddress").xrefs_to:
  Instruction(xref.from_address).highlight()  # highlight symbol xrefs

5. There are also some flashy (but not necessarily useful) features that might grab your attention.

Get the control flow graph of the main function, and display it:

Function("main").control_flow.show()

Find the shortest path from source to target in the program control flow graph. If it exists, highlight all basic blocks along the way.

source, target = BasicBlock("entry"), BasicBlock(0x00405073)
path = Program.control_flow().bfs(source)
while path.get(target):
    target.highlight()
    target = path[target]

6. Thanks to type hints, scripting gets much easier if your IDE supports that.

Finally, ghidralib doesn't lock you in - you can always retreat to familiar Ghidra types - just get them from the .raw property. For example instruction.raw is a Ghidra Instruction object, similarly function.raw is a Ghidra Function. So you can do the routine stuff in ghidralib, and fall back to Java if something is not implemented.

Learn more

Check out the documentation, especially the getting started page.

More detailed tutorial about specific features is in development. Completed chapters:

• Emulator

If you prefer to learn by example, you can also browse the examples directory.

A fair warning: ghidralib is still actively developed and the API may change slightly in the future. But this doesn't matter for your one-off scripts, does it?

Contributing

PRs are welcome. Feel free to open PRs to add things you need.

You can also just report issues and send feature requests. I started this library to cover my own needs, but I'm interested in learning what other people use it for.

Dragon icon at the top created by cube29, flaticon