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updated sheesh

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This commit is contained in:
lightningitoid
2025-10-27 07:46:35 +07:00
parent e7cfcbdf59
commit f61a42fa59
3 changed files with 164 additions and 150 deletions
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receiver/challenges/Sheesh.py
+60 -48
View File
@@ -5,6 +5,7 @@ import time
import re
import os
import binascii
import secrets
class Sheesh(Challenge):
flag_location = 'flags/sheesh.txt'
@@ -33,7 +34,7 @@ class Sheesh(Challenge):
bufsize=0,
)
def _read_exact_line(self, proc, timeout=5.0):
def _read_exact_line(self, proc, timeout=6.0):
start = time.time()
buf = []
r = proc.stdout.read
@@ -47,13 +48,13 @@ class Sheesh(Challenge):
if ch == "\n":
return "".join(buf)
def _read_until_prompt(self, proc, token: str, timeout=5.0):
def _read_until_prompt(self, proc, token: str, timeout=6.0):
start = time.time()
acc = []
r = proc.stdout.read
while True:
if time.time() - start > timeout:
raise TimeoutError(f"Timeout waiting for '{token}'")
raise TimeoutError(f"Timeout waiting for '{token}'")inp
ch = r(1)
if ch == "" and proc.poll() is not None:
raise RuntimeError("Process ended while waiting for prompt")
@@ -72,6 +73,36 @@ class Sheesh(Challenge):
assert self._HEX_RE.match(hx), f"{label} is not hex"
return hx
def test1(self, proc, b16_hex: str) -> str:
assert len(b16_hex) == 32
self._read_until_prompt(proc, "inp: ", timeout=6.0)
self._send_line(proc, b16_hex)
line = self._read_exact_line(proc, timeout=4.0)
assert line.startswith("blk:"), "Expected blk: for 16-byte input"
hx = self._expect_hex_field(line, "blk")
# chall prints an extra blank line after blk:
_ = self._read_exact_line(proc, timeout=4.0)
return hx.lower()
def test2(self, proc, iv_hex: str, ct_hex: str) -> str:
self._read_until_prompt(proc, "inp: ", timeout=6.0)
self._send_line(proc, iv_hex + ct_hex)
ans = self._read_exact_line(proc, timeout=4.0).strip().lower()
assert ans in ("ok", "zzz"), "Padding oracle did not return ok/zzz"
return ans
def test3(self, proc, iv_hex: str, ct_hex: str, trials=9) -> tuple[int, int, str]:
ok_cnt = 0
zzz_cnt = 0
for _ in range(trials):
ans = self.test2(proc, iv_hex, ct_hex)
if ans == "ok":
ok_cnt += 1
else:
zzz_cnt += 1
final = "ok" if ok_cnt > zzz_cnt else "zzz"
return ok_cnt, zzz_cnt, final
def distribute(self, flag):
try:
os.makedirs(os.path.dirname(self.flag_location), exist_ok=True)
@@ -90,7 +121,6 @@ class Sheesh(Challenge):
def check(self):
try:
# parity check: host vs container flag
with open(self.flag_location, 'r') as f:
host_flag = f.read().strip()
container_flag = self._read_container_flag()
@@ -99,9 +129,9 @@ class Sheesh(Challenge):
proc = self._spawn()
line1 = self._read_exact_line(proc, timeout=5.0)
line2 = self._read_exact_line(proc, timeout=5.0)
blank = self._read_exact_line(proc, timeout=5.0)
line1 = self._read_exact_line(proc, timeout=6.0)
line2 = self._read_exact_line(proc, timeout=6.0)
blank = self._read_exact_line(proc, timeout=6.0)
assert line1.startswith("iv:") and line2.startswith("ct:"), "Missing banner"
iv_hex = self._expect_hex_field(line1, "iv")
ct_hex = self._expect_hex_field(line2, "ct")
@@ -110,54 +140,36 @@ class Sheesh(Challenge):
assert len(iv0) == 16 and len(ct0) >= 16 and len(ct0) % 16 == 0, "Bad banner sizes"
self.logger.info("[ok] banner parsed")
self._read_until_prompt(proc, "blob: ", timeout=5.0)
block00 = "00" * 16
blk1 = self.test1(proc, block00)
blk2 = self.test1(proc, block00)
blk3 = self.test1(proc, block00)
assert blk1 == blk2 == blk3, "ECB-masked oracle not deterministic for same input"
self.logger.info("[ok] blk determinism (3x same input)")
qA = "00" * 16
self._send_line(proc, qA)
lA = self._read_exact_line(proc, timeout=3.0)
assert lA.startswith("blk:"), "Expected blk: for 16-byte blob"
blk1 = self._expect_hex_field(lA, "blk")
_ = self._read_exact_line(proc, timeout=3.0)
self._read_until_prompt(proc, "blob: ", timeout=5.0)
self._send_line(proc, qA)
lA2 = self._read_exact_line(proc, timeout=3.0)
blk2 = self._expect_hex_field(lA2, "blk")
_ = self._read_exact_line(proc, timeout=3.0)
assert blk1 == blk2, "ECB-masked oracle not deterministic for same input"
self.logger.info("[ok] blk determinism")
self._read_until_prompt(proc, "blob: ", timeout=5.0)
qB = "01" * 16
self._send_line(proc, qB)
lB = self._read_exact_line(proc, timeout=3.0)
blk3 = self._expect_hex_field(lB, "blk")
_ = self._read_exact_line(proc, timeout=3.0)
assert blk3 != blk1, "ECB-masked oracle returned same block for different input"
block01 = "01" * 16
blk4 = self.test1(proc, block01)
assert blk4 != blk1, "ECB-masked oracle returned same block for different input"
self.logger.info("[ok] blk diversity")
self._read_until_prompt(proc, "blob: ", timeout=5.0)
self._send_line(proc, "zzzz") # invalid hex
line_err = self._read_exact_line(proc, timeout=3.0)
self._read_until_prompt(proc, "inp: ", timeout=6.0)
self._send_line(proc, "zzzz") # invalid hex
line_err = self._read_exact_line(proc, timeout=4.0)
assert "err" in line_err.lower(), "Expected 'err' for non-hex input"
self.logger.info("[ok] error handling on non-hex")
maybe_hmmm = self._read_exact_line(proc, timeout=4.0).strip().lower()
if "hmmm" not in maybe_hmmm:
self.logger.warning(f"[warn] expected 'hmmm' after err, got: {maybe_hmmm!r}")
self.logger.info("[ok] error handling on non-hex input")
self._read_until_prompt(proc, "blob: ", timeout=5.0)
self._send_line(proc, (iv_hex + ct_hex))
ans1 = self._read_exact_line(proc, timeout=3.0).strip().lower()
assert ans1 in ("ok", "no"), "Padding oracle did not return ok/no for iv||ct"
self.logger.info(f"[ok] padding oracle responds ({ans1}) on banner bundle")
ok_cnt, zzz_cnt, final = self.test3(proc, iv_hex, ct_hex, trials=9)
self.logger.info(f"[ok] padding oracle responded on banner (ok={ok_cnt}, zzz={zzz_cnt}, final={final})")
self._read_until_prompt(proc, "blob: ", timeout=5.0)
iv_synth = os.urandom(16).hex()
ct_synth = ("00" * (6 * 16))
self._send_line(proc, iv_synth + ct_synth)
ans2 = self._read_exact_line(proc, timeout=3.0).strip().lower()
assert ans2 in ("ok", "no"), "Padding oracle did not return ok/no on synthetic 6-block ct"
self.logger.info(f"[ok] padding oracle responds ({ans2}) on synthetic payload")
self._read_until_prompt(proc, "blob: ", timeout=5.0)
iv_synth = secrets.token_hex(16)
ct_synth = "00" * (6 * 16) # 6 blocks
ok_cnt2, zzz_cnt2, final2 = self.test3(proc, iv_synth, ct_synth, trials=9)
self.logger.info(f"[ok] padding oracle responded on synthetic (ok={ok_cnt2}, zzz={zzz_cnt2}, final={final2})")
self._read_until_prompt(proc, "inp: ", timeout=6.0)
proc.kill()
self.logger.info('Check passed for sheesh')
return True
services/sheesh/dist/chall.py
Vendored
+50 -49
View File
@@ -1,80 +1,77 @@
#!/usr/bin/env python3
import os, sys, signal, binascii, random
import os, sys, binascii, random
from Crypto.Cipher import AES
from Crypto.Util.Padding import pad, unpad
from Crypto.Util.number import bytes_to_long, long_to_bytes
random.seed(os.urandom(16))
K0 = os.urandom(16)
K1 = os.urandom(16)
S0 = os.urandom(16)
S1 = os.urandom(16)
M0 = os.urandom(16)
M1 = os.urandom(16)
k0 = os.urandom(16)
k1 = os.urandom(16)
s0 = os.urandom(16); S1 = os.urandom(16)
m0 = os.urandom(16); M1 = os.urandom(16)
with open("/flag.txt","rb") as f:
flag = f.read()
def hex_input(q):
s = input(q).strip()
try: return binascii.unhexlify(s)
try: return binascii.unhexlify(s)
except: print("err"); return None
def enc1(b16: bytes) -> bytes:
x = AES.new(K1, AES.MODE_ECB).encrypt(b16)
return bytes(a ^ b for a, b in zip(x, b16))
def xex(b16):
x = AES.new(k1, AES.MODE_ECB).encrypt(b16)
return bytes(a ^ b for a,b in zip(x, b16))
def enc2(iv: bytes, m: bytes) -> bytes:
return AES.new(K0, AES.MODE_CBC, iv=iv).encrypt(pad(m, 16))
def enc1(iv, msg):
return AES.new(k0, AES.MODE_CBC, iv=iv).encrypt(pad(msg,16))
def enc3(m: bytes) -> bytes:
return AES.new(K1, AES.MODE_CBC, iv=b"\x00"*16).encrypt(pad(m, 16))[-16:]
def dec1(iv, c):
return unpad(AES.new(k0, AES.MODE_CBC, iv=iv).decrypt(c), 16)
def T(iv: bytes, ct: bytes):
def enc2(msg):
return AES.new(k1, AES.MODE_CBC, iv=b"\x00"*16).encrypt(pad(msg,16))[-16:]
def F(iv, ct):
n = len(ct)
if n < 96 or (n & 15):
return None
v = memoryview(ct)
W = [bytes(v[i:i+16]) for i in range(0, n, 16)]
if n < 96 or (n & 15): return None
W = [ct[i:i+16] for i in range(0, n, 16)]
m = len(W)
r = ((iv[0] & 7) + 2) % m
if r:
W = W[r:] + W[:r]
digest = enc2(iv)
r = ((iv[0]^iv[-1]) & 7) + 2
r %= m
if r: W = W[r:] + W[:r]
j = 1 + (W[0][0] & 1)
if len(W) <= j:
return None
if len(W) < 3: return None
A0 = long_to_bytes(bytes_to_long(W[0]) ^ bytes_to_long(m0))
A1 = long_to_bytes(bytes_to_long(W[1]) ^ bytes_to_long(M1))
j = 1 + (digest[0] & 1)
del W[j]
if len(W) < 2:
return None
if len(W) < 2: return None
a0 = long_to_bytes(bytes_to_long(W[0]) ^ bytes_to_long(M0))
a1 = long_to_bytes(bytes_to_long(W[1]) ^ bytes_to_long(M1))
return b"".join((S0, a0, S1, a1, *W[2:]))
return b"".join((s0, A0, S1, A1, *W[2:]))
def C(iv: bytes, ct: bytes) -> bool:
z = T(iv, ct)
def O(iv, ct):
z = F(iv, ct)
if z is None:
ok = False
else:
try:
x = AES.new(K0, AES.MODE_CBC, iv=iv).decrypt(z)
unpad(x, 16)
dec1(iv, z)
ok = True
except:
ok = False
if random.random() < 0.08:
if random.random() < 0.10:
ok = not ok
return ok
iv = os.urandom(16)
MK = enc3(iv + iv)
H0 = (flag + b"\x00"*16)[:16]
H1 = bytes(a ^ b for a, b in zip(H0, MK))
pt = H1 + flag[16:]
ct = enc2(iv, pt)
MK = enc2(iv + iv)
h0 = (flag + b"\x00"*16)[:16]
h1 = bytes(a ^ b for a,b in zip(h0, MK))
pt = h1 + flag[16:]
ct = enc1(iv, pt)
print("iv:", iv.hex())
print("ct:", ct.hex())
@@ -82,17 +79,21 @@ print()
while True:
try:
blob = hex_input("blob: ")
if blob is None:
print("err\n"); continue
L = len(blob)
inp = hex_input("inp: ")
if inp is None:
print("hmmm\n"); continue
L = len(inp)
if L == 16:
y = enc1(blob)
y = xex(inp)
print("blk:", y.hex()); print()
elif L >= 32 and (L % 16) == 0:
iv, ct = blob[:16], blob[16:]
print("ok\n" if C(iv, ct) else "no\n")
ivq, ctq = inp[:16], inp[16:]
print("ok\n" if O(ivq, ctq) else "zzz\n")
else:
print("err\n")
print("hmmm\n")
except EOFError:
break
services/sheesh/src/chall.py
+50 -49
View File
@@ -1,80 +1,77 @@
#!/usr/bin/env python3
import os, sys, signal, binascii, random
import os, sys, binascii, random
from Crypto.Cipher import AES
from Crypto.Util.Padding import pad, unpad
from Crypto.Util.number import bytes_to_long, long_to_bytes
random.seed(os.urandom(16))
K0 = os.urandom(16)
K1 = os.urandom(16)
S0 = os.urandom(16)
S1 = os.urandom(16)
M0 = os.urandom(16)
M1 = os.urandom(16)
k0 = os.urandom(16)
k1 = os.urandom(16)
s0 = os.urandom(16); S1 = os.urandom(16)
m0 = os.urandom(16); M1 = os.urandom(16)
with open("/flag.txt","rb") as f:
flag = f.read()
def hex_input(q):
s = input(q).strip()
try: return binascii.unhexlify(s)
try: return binascii.unhexlify(s)
except: print("err"); return None
def enc1(b16: bytes) -> bytes:
x = AES.new(K1, AES.MODE_ECB).encrypt(b16)
return bytes(a ^ b for a, b in zip(x, b16))
def xex(b16):
x = AES.new(k1, AES.MODE_ECB).encrypt(b16)
return bytes(a ^ b for a,b in zip(x, b16))
def enc2(iv: bytes, m: bytes) -> bytes:
return AES.new(K0, AES.MODE_CBC, iv=iv).encrypt(pad(m, 16))
def enc1(iv, msg):
return AES.new(k0, AES.MODE_CBC, iv=iv).encrypt(pad(msg,16))
def enc3(m: bytes) -> bytes:
return AES.new(K1, AES.MODE_CBC, iv=b"\x00"*16).encrypt(pad(m, 16))[-16:]
def dec1(iv, c):
return unpad(AES.new(k0, AES.MODE_CBC, iv=iv).decrypt(c), 16)
def T(iv: bytes, ct: bytes):
def enc2(msg):
return AES.new(k1, AES.MODE_CBC, iv=b"\x00"*16).encrypt(pad(msg,16))[-16:]
def F(iv, ct):
n = len(ct)
if n < 96 or (n & 15):
return None
v = memoryview(ct)
W = [bytes(v[i:i+16]) for i in range(0, n, 16)]
if n < 96 or (n & 15): return None
W = [ct[i:i+16] for i in range(0, n, 16)]
m = len(W)
r = ((iv[0] & 7) + 2) % m
if r:
W = W[r:] + W[:r]
digest = enc2(iv)
r = ((iv[0]^iv[-1]) & 7) + 2
r %= m
if r: W = W[r:] + W[:r]
j = 1 + (W[0][0] & 1)
if len(W) <= j:
return None
if len(W) < 3: return None
A0 = long_to_bytes(bytes_to_long(W[0]) ^ bytes_to_long(m0))
A1 = long_to_bytes(bytes_to_long(W[1]) ^ bytes_to_long(M1))
j = 1 + (digest[0] & 1)
del W[j]
if len(W) < 2:
return None
if len(W) < 2: return None
a0 = long_to_bytes(bytes_to_long(W[0]) ^ bytes_to_long(M0))
a1 = long_to_bytes(bytes_to_long(W[1]) ^ bytes_to_long(M1))
return b"".join((S0, a0, S1, a1, *W[2:]))
return b"".join((s0, A0, S1, A1, *W[2:]))
def C(iv: bytes, ct: bytes) -> bool:
z = T(iv, ct)
def O(iv, ct):
z = F(iv, ct)
if z is None:
ok = False
else:
try:
x = AES.new(K0, AES.MODE_CBC, iv=iv).decrypt(z)
unpad(x, 16)
dec1(iv, z)
ok = True
except:
ok = False
if random.random() < 0.08:
if random.random() < 0.10:
ok = not ok
return ok
iv = os.urandom(16)
MK = enc3(iv + iv)
H0 = (flag + b"\x00"*16)[:16]
H1 = bytes(a ^ b for a, b in zip(H0, MK))
pt = H1 + flag[16:]
ct = enc2(iv, pt)
MK = enc2(iv + iv)
h0 = (flag + b"\x00"*16)[:16]
h1 = bytes(a ^ b for a,b in zip(h0, MK))
pt = h1 + flag[16:]
ct = enc1(iv, pt)
print("iv:", iv.hex())
print("ct:", ct.hex())
@@ -82,17 +79,21 @@ print()
while True:
try:
blob = hex_input("blob: ")
if blob is None:
print("err\n"); continue
L = len(blob)
inp = hex_input("inp: ")
if inp is None:
print("hmmm\n"); continue
L = len(inp)
if L == 16:
y = enc1(blob)
y = xex(inp)
print("blk:", y.hex()); print()
elif L >= 32 and (L % 16) == 0:
iv, ct = blob[:16], blob[16:]
print("ok\n" if C(iv, ct) else "no\n")
ivq, ctq = inp[:16], inp[16:]
print("ok\n" if O(ivq, ctq) else "zzz\n")
else:
print("err\n")
print("hmmm\n")
except EOFError:
break