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217 lines
6.0 KiB
Markdown
217 lines
6.0 KiB
Markdown
# 2.7 Pwntools
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- [安装](#安装)
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- [模块简介](#模块简介)
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- [使用 Pwntools](#使用-pwntools)
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- [Pwntools 在 CTF 中的运用](#pwntools-在-ctf-中的运用)
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- [参考资料](#参考资料)
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Pwntools 是一个 CTF 框架和漏洞利用开发库,用 Python 开发,由 rapid 设计,旨在让使用者简单快速的编写 exp 脚本。包含了本地执行、远程连接读写、shellcode 生成、ROP 链的构建、ELF 解析、符号泄露众多强大功能。
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## 安装
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1. 安装binutils:
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```shell
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git clone https://github.com/Gallopsled/pwntools-binutils
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sudo apt-get install software-properties-common
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sudo apt-add-repository ppa:pwntools/binutils
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sudo apt-get update
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sudo apt-get install binutils-arm-linux-gnu
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```
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2. 安装capstone:
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```shell
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git clone https://github.com/aquynh/capstone
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cd capstone
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make
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sudo make install
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```
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3. 安装pwntools:
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```shell
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sudo apt-get install libssl-dev
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sudo pip install pwntools
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```
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如果你在使用 Arch Linux,则可以通过 AUR 直接安装,这个包目前是由我维护的,如果有什么问题,欢迎与我交流:
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```
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$ yaourt -S python2-pwntools
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或者
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$ yaourt -S python2-pwntools-git
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```
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测试安装是否成功:
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```python
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>>> import pwn
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>>> pwn.asm("xor eax,eax")
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'1\xc0'
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```
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## 模块简介
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Pwntools 分为两个模块,一个是 `pwn`,简单地使用 `from pwn import *` 即可将所有子模块和一些常用的系统库导入到当前命名空间中,是专门针对 CTF 比赛的;而另一个模块是 `pwnlib`,它更推荐你仅仅导入需要的子模块,常用于基于 pwntools 的开发。
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下面是 pwnlib 的一些子模块(常用模块和函数加粗显示):
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- `adb`:安卓调试桥
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- `args`:命令行魔法参数
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- **`asm`**:汇编和反汇编,支持 i386/i686/amd64/thumb 等
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- `constants`:对不同架构和操作系统的常量的快速访问
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- `config`:配置文件
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- `context`:设置运行时变量
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- **`dynelf`**:用于远程函数泄露
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- `encoders`:对 shellcode 进行编码
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- **`elf`**:用于操作 ELF 可执行文件和库
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- `flag`:提交 flag 到服务器
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- **`fmtstr`**:格式化字符串利用工具
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- **`gdb`**:与 gdb 配合使用
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- `libcdb`:libc 数据库
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- `log`:日志记录
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- **`memleak`**:用于内存泄露
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- `rop`:ROP 利用模块,包括 rop 和 srop
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- `runner`:运行 shellcode
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- **`shellcraft`**:shellcode 生成器
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- `term`:终端处理
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- `timeout`:超时处理
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- **`tubes`**:能与 sockets, processes, ssh 等进行连接
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- `ui`:与用户交互
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- `useragents`:useragent 字符串数据库
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- **`util`**:一些实用小工具
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## 使用 Pwntools
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下面我们对常用模块和函数做详细的介绍。
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#### tubes
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在一次漏洞利用中,首先当然要与二进制文件或者目标服务器进行交互,这就要用到 tubes 模块。
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主要函数在 `pwnlib.tubes.tube` 中实现,子模块只实现某管道特殊的地方。四种管道和相对应的子模块如下:
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- `pwnlib.tubes.process`:进程
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- `>>> p = process('/bin/sh')`
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- `pwnlib.tubes.serialtube`:串口
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- `pwnlib.tubes.sock`:套接字
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- `>>> r = remote('127.0.0.1', 1080)`
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- `>>> l = listen(1080)`
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- `pwnlib.tubes.ssh`:SSH
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- `>>> s = ssh(host='example.com`, user='name', password='passwd')`
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`pwnlib.tubes.tube` 中的主要函数:
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- `interactive()`:可同时读写管道,相当于回到 shell 模式进行交互,在取得 shell 之后调用
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- `recv(numb=1096, timeout=default)`:接收指定字节数的数据
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- `recvall()`:接收数据直到 EOF
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- `recvline(keepends=True)`:接收一行,可选择是否保留行尾的 `\n`
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- `recvrepeat(timeout=default)`:接收数据直到 EOF 或 timeout
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- `recvuntil(delims, timeout=default)`:接收数据直到 delims 出现
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- `send(data)`:发送数据
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- `sendline(data)`:发送一行,默认在行尾加 `\n`
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- `close()`:关闭管道
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下面是一个例子,先使用 listen 开启一个本地的监听端口,然后使用 remote 开启一个套接字管道与之交互:
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```
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In [1]: from pwn import *
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In [2]: l = listen()
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[x] Trying to bind to 0.0.0.0 on port 0
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[x] Trying to bind to 0.0.0.0 on port 0: Trying 0.0.0.0
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[+] Trying to bind to 0.0.0.0 on port 0: Done
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[x] Waiting for connections on 0.0.0.0:35117
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In [3]: r = remote('localhost', l.lport)
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[x] Opening connection to localhost on port 35117
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[x] Opening connection to localhost on port 35117: Trying ::1
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[x] Opening connection to localhost on port 35117: Trying 127.0.0.1
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[+] Opening connection to localhost on port 35117: Done
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[+] Waiting for connections on 0.0.0.0:35117: Got connection from 127.0.0.1 on port 36966
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In [4]: c = l.wait_for_connection()
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In [5]: r.send('hello\n')
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In [6]: c.recv()
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Out[6]: 'hello\n'
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In [7]: r.send('hello\n')
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In [8]: c.recvline()
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Out[8]: 'hello\n'
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In [9]: r.sendline('hello')
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In [10]: c.recv()
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Out[10]: 'hello\n'
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In [11]: r.sendline('hello')
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In [12]: c.recvline()
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Out[12]: 'hello\n'
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In [13]: r.sendline('hello')
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In [14]: c.recvline(keepends=False)
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Out[14]: 'hello'
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In [15]: r.send('hello world')
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In [16]: c.recvuntil('hello')
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Out[16]: 'hello'
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In [17]: c.recv()
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Out[17]: ' world'
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In [18]: c.close()
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[*] Closed connection to 127.0.0.1 port 36966
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In [19]: r.close()
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[*] Closed connection to localhost port 35117
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```
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下面是一个与进程交互的例子:
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```
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In [1]: p = process('/bin/sh')
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[x] Starting local process '/bin/sh'
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[+] Starting local process '/bin/sh': pid 32165
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In [2]: p.sendline('sleep 3; echo hello world;')
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In [3]: p.recvline(timeout=1)
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Out[3]: 'hello world\n'
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In [4]: p.sendline('sleep 3; echo hello world;')
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In [5]: p.recvline(timeout=1)
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Out[5]: ''
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In [6]: p.recvline(timeout=5)
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Out[6]: 'hello world\n'
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In [7]: p.interactive()
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[*] Switching to interactive mode
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whoami
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firmy
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^C[*] Interrupted
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In [8]: p.close()
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[*] Stopped process '/bin/sh' (pid 32165)
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```
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#### asm
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#### dynelf
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#### elf
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#### fmtstr
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#### gdb
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#### memleak
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#### shellcraft
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#### util
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## Pwntools 在 CTF 中的运用
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## 参考资料
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- [docs.pwntools.com](https://docs.pwntools.com/en/stable/index.html)
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