adding encryption support for ongeki

example_config/ongeki.yaml

@@ -35,3 +35,6 @@ version:
     card_maker: 1.30.01
   7:
     card_maker: 1.35.03
+
+crypto:
+  encrypted_only: False

titles/ongeki/config.py

@@ -48,9 +48,30 @@ class OngekiCardMakerVersionConfig:
             self.__config, "ongeki", "version", default={}
         ).get(version)
 
+class OngekiCryptoConfig:
+    def __init__(self, parent_config: "OngekiConfig") -> None:
+        self.__config = parent_config
+
+    @property
+    def keys(self) -> Dict:
+        """
+        in the form of:
+        internal_version: [key, iv]
+        all values are hex strings
+        """
+        return CoreConfig.get_config_field(
+            self.__config, "ongeki", "crypto", "keys", default={}
+        )
+
+    @property
+    def encrypted_only(self) -> bool:
+        return CoreConfig.get_config_field(
+            self.__config, "ongeki", "crypto", "encrypted_only", default=False
+        )
 
 class OngekiConfig(dict):
     def __init__(self) -> None:
         self.server = OngekiServerConfig(self)
         self.gachas = OngekiGachaConfig(self)
         self.version = OngekiCardMakerVersionConfig(self)
+        self.crypto = OngekiCryptoConfig(self)

titles/ongeki/index.py

@@ -7,6 +7,10 @@ import logging
 import coloredlogs
 import zlib
 from logging.handlers import TimedRotatingFileHandler
+from Crypto.Cipher import AES
+from Crypto.Util.Padding import pad
+from Crypto.Protocol.KDF import PBKDF2
+from Crypto.Hash import SHA1
 from os import path
 from typing import Tuple
 
@@ -28,6 +32,7 @@ class OngekiServlet:
     def __init__(self, core_cfg: CoreConfig, cfg_dir: str) -> None:
         self.core_cfg = core_cfg
         self.game_cfg = OngekiConfig()
+        self.hash_table: Dict[Dict[str, str]] = {}
         if path.exists(f"{cfg_dir}/{OngekiConstants.CONFIG_NAME}"):
             self.game_cfg.update(
                 yaml.safe_load(open(f"{cfg_dir}/{OngekiConstants.CONFIG_NAME}"))
@@ -45,6 +50,8 @@ class OngekiServlet:
         ]
 
         self.logger = logging.getLogger("ongeki")
+
+        if not hasattr(self.logger, "inited"):
             log_fmt_str = "[%(asctime)s] Ongeki | %(levelname)s | %(message)s"
             log_fmt = logging.Formatter(log_fmt_str)
             fileHandler = TimedRotatingFileHandler(
@@ -66,6 +73,37 @@ class OngekiServlet:
             coloredlogs.install(
                 level=self.game_cfg.server.loglevel, logger=self.logger, fmt=log_fmt_str
             )
+            self.logger.inited = True
+
+        for version, keys in self.game_cfg.crypto.keys.items():
+            if len(keys) < 3:
+                continue
+
+            self.hash_table[version] = {}
+
+            method_list = [
+                method
+                for method in dir(self.versions[version])
+                if not method.startswith("__")
+            ]
+            for method in method_list:
+                method_fixed = inflection.camelize(method)[6:-7]
+                # number of iterations is 64 on Bright Memory
+                iter_count = 64
+                hash = PBKDF2(
+                    method_fixed,
+                    bytes.fromhex(keys[2]),
+                    128,
+                    count=iter_count,
+                    hmac_hash_module=SHA1,
+                )
+
+                hashed_name = hash.hex()[:32] # truncate unused bytes like the game does
+                self.hash_table[version][hashed_name] = method_fixed
+
+                self.logger.debug(
+                    f"Hashed v{version} method {method_fixed} with {bytes.fromhex(keys[2])} to get {hash.hex()[:32]}"
+                )
 
     @classmethod
     def get_allnet_info(
@@ -100,6 +138,7 @@ class OngekiServlet:
 
         req_raw = request.content.getvalue()
         url_split = url_path.split("/")
+        encrtped = False
         internal_ver = 0
         endpoint = url_split[len(url_split) - 1]
         client_ip = Utils.get_ip_addr(request)
@@ -125,8 +164,45 @@ class OngekiServlet:
             # If we get a 32 character long hex string, it's a hash and we're
             # doing encrypted. The likelyhood of false positives is low but
             # technically not 0
-            self.logger.error("Encryption not supported at this time")
-            return b""
+            if internal_ver not in self.hash_table:
+                self.logger.error(
+                    f"v{version} does not support encryption or no keys entered"
+                )
+                return zlib.compress(b'{"stat": "0"}')
+
+            elif endpoint.lower() not in self.hash_table[internal_ver]:
+                self.logger.error(
+                    f"No hash found for v{version} endpoint {endpoint}"
+                )
+                return zlib.compress(b'{"stat": "0"}')
+
+            endpoint = self.hash_table[internal_ver][endpoint.lower()]
+
+            try:
+                crypt = AES.new(
+                    bytes.fromhex(self.game_cfg.crypto.keys[internal_ver][0]),
+                    AES.MODE_CBC,
+                    bytes.fromhex(self.game_cfg.crypto.keys[internal_ver][1]),
+                )
+
+                req_raw = crypt.decrypt(req_raw)
+
+            except Exception as e:
+                self.logger.error(
+                    f"Failed to decrypt v{version} request to {endpoint} -> {e}"
+                )
+                return zlib.compress(b'{"stat": "0"}')
+
+            encrtped = True
+
+        if (
+            not encrtped
+            and self.game_cfg.crypto.encrypted_only
+        ):
+            self.logger.error(
+                f"Unencrypted v{version} {endpoint} request, but config is set to encrypted only: {req_raw}"
+            )
+            return zlib.compress(b'{"stat": "0"}')
 
         try:
             unzip = zlib.decompress(req_raw)
@@ -163,4 +239,17 @@ class OngekiServlet:
 
         self.logger.debug(f"Response {resp}")
 
-        return zlib.compress(json.dumps(resp, ensure_ascii=False).encode("utf-8"))
+        zipped = zlib.compress(json.dumps(resp, ensure_ascii=False).encode("utf-8"))
+
+        if not encrtped:
+            return zipped
+
+        padded = pad(zipped, 16)
+
+        crypt = AES.new(
+            bytes.fromhex(self.game_cfg.crypto.keys[internal_ver][0]),
+            AES.MODE_CBC,
+            bytes.fromhex(self.game_cfg.crypto.keys[internal_ver][1]),
+        )
+
+        return crypt.encrypt(padded)