support SDGS encryption
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c3efc36be2
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@ -39,7 +39,7 @@ class ChuniServlet(BaseServlet):
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def __init__(self, core_cfg: CoreConfig, cfg_dir: str) -> None:
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super().__init__(core_cfg, cfg_dir)
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self.game_cfg = ChuniConfig()
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self.hash_table: Dict[Dict[str, str]] = {}
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self.hash_table: Dict[str, Dict[str, str]] = {}
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if path.exists(f"{cfg_dir}/{ChuniConstants.CONFIG_NAME}"):
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self.game_cfg.update(
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yaml.safe_load(open(f"{cfg_dir}/{ChuniConstants.CONFIG_NAME}"))
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@ -89,45 +89,59 @@ class ChuniServlet(BaseServlet):
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)
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self.logger.inited = True
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known_iter_counts = {
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ChuniConstants.VER_CHUNITHM_CRYSTAL_PLUS: 67,
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ChuniConstants.VER_CHUNITHM_PARADISE: 44,
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f"{ChuniConstants.VER_CHUNITHM_PARADISE}_int": 25,
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ChuniConstants.VER_CHUNITHM_NEW: 54,
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f"{ChuniConstants.VER_CHUNITHM_NEW}_int": 49,
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ChuniConstants.VER_CHUNITHM_NEW_PLUS: 25,
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ChuniConstants.VER_CHUNITHM_SUN: 70,
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ChuniConstants.VER_CHUNITHM_SUN_PLUS: 36,
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}
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for version, keys in self.game_cfg.crypto.keys.items():
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if len(keys) < 3:
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continue
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self.hash_table[version] = {}
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if isinstance(version, int):
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version_idx = version
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else:
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version_idx = int(version.split("_")[0])
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salt = bytes.fromhex(keys[2])
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if len(keys) >= 4:
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iter_count = keys[3]
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elif (iter_count := known_iter_counts.get(version)) is None:
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self.logger.error(
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"Number of iteration rounds for version %s is not known, but it is not specified in the config",
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version,
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)
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continue
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self.hash_table[version] = {}
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method_list = [
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method
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for method in dir(self.versions[version])
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for method in dir(self.versions[version_idx])
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if not method.startswith("__")
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]
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for method in method_list:
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method_fixed = inflection.camelize(method)[6:-7]
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# number of iterations was changed to 70 in SUN and then to 36
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if version == ChuniConstants.VER_CHUNITHM_SUN_PLUS:
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iter_count = 36
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elif version == ChuniConstants.VER_CHUNITHM_SUN:
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iter_count = 70
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elif version == ChuniConstants.VER_CHUNITHM_NEW_PLUS:
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iter_count = 25
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elif version == ChuniConstants.VER_CHUNITHM_NEW:
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iter_count = 54
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elif version == ChuniConstants.VER_CHUNITHM_PARADISE:
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iter_count = 44
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elif version == ChuniConstants.VER_CHUNITHM_CRYSTAL_PLUS:
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iter_count = 67
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else:
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disp_version = (
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ChuniConstants.VERSION_NAMES[version]
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if version in ChuniConstants.VERSION_NAMES
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else str(version)
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)
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self.logger.warning("Version %s does not support encryption", disp_version)
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continue
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# This only applies for CHUNITHM NEW International and later for some reason.
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# CHUNITHM SUPERSTAR (PLUS) did not add "Exp" to the endpoint when hashing.
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if (
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isinstance(version, str)
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and version.endswith("_int")
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and version_idx >= ChuniConstants.VER_CHUNITHM_NEW
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):
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method_fixed += "C3Exp"
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hash = PBKDF2(
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method_fixed,
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bytes.fromhex(keys[2]),
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salt,
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128,
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count=iter_count,
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hmac_hash_module=SHA1,
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@ -137,7 +151,7 @@ class ChuniServlet(BaseServlet):
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self.hash_table[version][hashed_name] = method_fixed
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self.logger.debug(
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f"Hashed v{version} method {method_fixed} with {bytes.fromhex(keys[2])} to get {hash.hex()}"
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f"Hashed v{version} method {method_fixed} with {salt} to get {hashed_name}"
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)
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@classmethod
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@ -226,31 +240,39 @@ class ChuniServlet(BaseServlet):
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if all(c in string.hexdigits for c in endpoint) and len(endpoint) == 32:
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# If we get a 32 character long hex string, it's a hash and we're
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# doing encrypted. The likelyhood of false positives is low but
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# doing encrypted. The likelihood of false positives is low but
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# technically not 0
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if game_code == "SDGS":
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crypto_cfg_key = f"{internal_ver}_int"
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hash_table_key = f"{internal_ver}_int"
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else:
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crypto_cfg_key = internal_ver
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hash_table_key = internal_ver
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if internal_ver < ChuniConstants.VER_CHUNITHM_NEW:
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endpoint = request.headers.get("User-Agent").split("#")[0]
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else:
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if internal_ver not in self.hash_table:
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if hash_table_key not in self.hash_table:
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self.logger.error(
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f"v{version} does not support encryption or no keys entered"
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)
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return Response(zlib.compress(b'{"stat": "0"}'))
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elif endpoint.lower() not in self.hash_table[internal_ver]:
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elif endpoint.lower() not in self.hash_table[hash_table_key]:
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self.logger.error(
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f"No hash found for v{version} endpoint {endpoint}"
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)
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return Response(zlib.compress(b'{"stat": "0"}'))
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endpoint = self.hash_table[internal_ver][endpoint.lower()]
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endpoint = self.hash_table[hash_table_key][endpoint.lower()]
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try:
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crypt = AES.new(
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bytes.fromhex(self.game_cfg.crypto.keys[internal_ver][0]),
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bytes.fromhex(self.game_cfg.crypto.keys[crypto_cfg_key][0]),
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AES.MODE_CBC,
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bytes.fromhex(self.game_cfg.crypto.keys[internal_ver][1]),
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bytes.fromhex(self.game_cfg.crypto.keys[crypto_cfg_key][1]),
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)
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req_raw = crypt.decrypt(req_raw)
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