From 1fa848c01f0289a40d14f60bfa61fd027eccb3d2 Mon Sep 17 00:00:00 2001
From: agatha <agatha@juggalol.com>
Date: Fri, 25 Oct 2024 16:24:08 -0400
Subject: [PATCH] crypto: halloween

---
 crypto/halloween/halloween.zip        | Bin 0 -> 1249 bytes
 crypto/halloween/halloween/Dockerfile |  15 +++++++++++++++
 crypto/halloween/halloween/chall.py   |  16 ++++++++++++++++
 crypto/halloween/halloween/entry.sh   |   6 ++++++
 4 files changed, 37 insertions(+)
 create mode 100644 crypto/halloween/halloween.zip
 create mode 100644 crypto/halloween/halloween/Dockerfile
 create mode 100644 crypto/halloween/halloween/chall.py
 create mode 100644 crypto/halloween/halloween/entry.sh

diff --git a/crypto/halloween/halloween.zip b/crypto/halloween/halloween.zip
new file mode 100644
index 0000000000000000000000000000000000000000..325d78ea56860ac2e67511818d40783fc4a2c8f2
GIT binary patch
literal 1249
zcmWIWW@h1H0D)UeBO}2KD8a=b!;q1flapVbnwqB{8p6rIJm<M|`a~cut>9*0WO>2N
zzyKx!fM$pQb#Z{rcyLnkj3^@m!z>^cLNOy5WSm|>CEP5Kd1z+kPH^-)q9D@tea<6Z
zy_O}3Qt8P)X-n018K|Xwo4oC_m1=I|fo$um6&(H#9QRCdpHOxzqi4;7_W!>dHXq%@
zT{km(v&-dX>6M$(j+VS$qkiMIL#w>(&G$#xj<NZQMzp(q*mUw+7vB-#2X@beHZeRE
zZMImZ8{xdtCe2z=a&@7P!*|2Yj-__S*0;N^w))hq*H_ivviidDWcxBx|K~B1GDmbC
zlzz|Iu%blvt?{4#hYmkJ`}SMaXOX9Fm$w~ny0$C*quaS`=S5Gxm&hq(-@4Jbdrjt>
zh72KvyGj#UZG~8-FVk07m=&qCOx!E<q2r0`CTrb))YSiu_`o5jbyp#$rv3PSi>`lH
zK2J1Qap`uMQ^sQ}p`dvUlWG}J16X(R@}~!Z!TlSEMNk6RB|kYkwJ0q!Cly~1hxT6N
zYBG>$U4J|Hk4wpNK|#k0p^_d?QzTVI4WDI9%C*lE6xv(8>~2Y=-MR8}lP>ZmJe_j!
z@<e-?syzo{yq#|7G4+{$*u$Q7$MZoX+cl1N4_vJN{xi2<qjNC&ifrmTAvPI7scU8i
z#|59<vWgQaFum5f$tj&<=4FeusteBqpO-qA|KwZfirps@jO5I76t-$>-(O|M8QT9d
zLU7aaoUI%;{dxEd@3LK}UVAuK$YuJBO;2JUYb0j+9M)(|{+_?C`X2*oa6JA$aY-RC
zC@O#$HNB<gl@wL#6=&cJjNq`43;w6hT-HDL;E~q(6K6a_H$3t>`8<fB>CvAjM}%4h
zo-@SCpMM|_Zm&Hxi$mG&fW5|&Fm>Ji8e4U?dMwx2y2ZlOP<1JX%A~aqq#nM?S-Nh1
zM8Jaib0*H1yf{2y<+_BF<?|;+Et?-cYcjKmo&HpApyL^t<d|_~ISHUAKtO=uts{s=
z&Va0t42YItAm-u9eh~A3Igw#WqYH|8h|EZwxu~fQ+1#Z-;}PyePJ_gmj2eN+CU0Rv
aHW?9}xXfi`1BDq25JmyrR0u4e7#IL?54sxw

literal 0
HcmV?d00001

diff --git a/crypto/halloween/halloween/Dockerfile b/crypto/halloween/halloween/Dockerfile
new file mode 100644
index 0000000..2d3a8be
--- /dev/null
+++ b/crypto/halloween/halloween/Dockerfile
@@ -0,0 +1,15 @@
+FROM python:3.11-alpine
+
+RUN apk --update add socat \
+	&& adduser -D --home /app user \
+	&& pip3 install gostcrypto
+
+COPY --chown=user . /app
+
+RUN chmod 755 /app/entry.sh /app/chall.py
+
+WORKDIR /app
+
+EXPOSE ${LISTEN_PORT}
+
+ENTRYPOINT ["/app/entry.sh"]
\ No newline at end of file
diff --git a/crypto/halloween/halloween/chall.py b/crypto/halloween/halloween/chall.py
new file mode 100644
index 0000000..4925c5b
--- /dev/null
+++ b/crypto/halloween/halloween/chall.py
@@ -0,0 +1,16 @@
+#!/usr/bin/env python3
+import gostcrypto
+import os
+
+with open("flag.txt", "rb") as f:
+    flag = f.read()
+
+key, iv = os.urandom(32), os.urandom(8)
+cipher = gostcrypto.gostcipher.new(
+    "kuznechik", key, gostcrypto.gostcipher.MODE_CTR, init_vect=iv
+)
+
+print(f"It's almost Halloween, time to get sp00{cipher.encrypt(flag).hex()}00ky 👻!")
+
+while True:
+    print(cipher.encrypt(bytes.fromhex(input())).hex())
diff --git a/crypto/halloween/halloween/entry.sh b/crypto/halloween/halloween/entry.sh
new file mode 100644
index 0000000..5ee439f
--- /dev/null
+++ b/crypto/halloween/halloween/entry.sh
@@ -0,0 +1,6 @@
+#! /bin/sh
+
+while :
+do
+    socat TCP-LISTEN:${LISTEN_PORT},forever,reuseaddr,fork EXEC:'/app/chall.py' 2>/dev/null
+done