diff --git a/cdm/devices/android_generic/your_cdm b/cdm/devices/android_generic/your_cdm new file mode 100644 index 0000000..e69de29 diff --git a/cdm/wks.py b/cdm/wks.py new file mode 100644 index 0000000..f991f31 --- /dev/null +++ b/cdm/wks.py @@ -0,0 +1,764 @@ +import binascii +import os +import base64 +from google.protobuf import descriptor as _descriptor, descriptor_pool as _descriptor_pool, symbol_database as _symbol_database +from google.protobuf.internal import builder as _builder +import os +import time +import binascii +import logging +import subprocess +import re +import base64 +import requests +from base64 import b64encode +from google.protobuf.message import DecodeError +from google.protobuf import text_format + +from Cryptodome.Random import get_random_bytes +from Cryptodome.Random import random +from Cryptodome.Cipher import PKCS1_OAEP, AES +from Cryptodome.Hash import CMAC, SHA256, HMAC, SHA1 +from Cryptodome.PublicKey import RSA +from Cryptodome.Signature import pss +from Cryptodome.Util import Padding +import logging + +_sym_db = _symbol_database.Default() + +DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile( + b'\n\x0fwv_proto2.proto\"\xe7\x05\n\x14\x43lientIdentification\x12-\n\x04Type\x18\x01 \x02(\x0e\x32\x1f.ClientIdentification.TokenType\x12\'\n\x05Token\x18\x02 \x01(\x0b\x32\x18.SignedDeviceCertificate\x12\x33\n\nClientInfo\x18\x03 \x03(\x0b\x32\x1f.ClientIdentification.NameValue\x12\x1b\n\x13ProviderClientToken\x18\x04 \x01(\x0c\x12\x16\n\x0eLicenseCounter\x18\x05 \x01(\r\x12\x45\n\x13_ClientCapabilities\x18\x06 \x01(\x0b\x32(.ClientIdentification.ClientCapabilities\x12 \n\x0b_FileHashes\x18\x07 \x01(\x0b\x32\x0b.FileHashes\x1a(\n\tNameValue\x12\x0c\n\x04Name\x18\x01 \x02(\t\x12\r\n\x05Value\x18\x02 \x02(\t\x1a\xa4\x02\n\x12\x43lientCapabilities\x12\x13\n\x0b\x43lientToken\x18\x01 \x01(\r\x12\x14\n\x0cSessionToken\x18\x02 \x01(\r\x12\"\n\x1aVideoResolutionConstraints\x18\x03 \x01(\r\x12L\n\x0eMaxHdcpVersion\x18\x04 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\x01(\x0b\x32\x18.SignedDeviceCertificate\x12\x11\n\tSignature\x18\x03 \x01(\x0c\x12\x12\n\nSessionKey\x18\x04 \x01(\x0c\x12-\n\x11RemoteAttestation\x18\x05 \x01(\x0b\x32\x12.RemoteAttestation\"}\n\x0bMessageType\x12\x13\n\x0fLICENSE_REQUEST\x10\x01\x12\x0b\n\x07LICENSE\x10\x02\x12\x12\n\x0e\x45RROR_RESPONSE\x10\x03\x12\x1f\n\x1bSERVICE_CERTIFICATE_REQUEST\x10\x04\x12\x17\n\x13SERVICE_CERTIFICATE\x10\x05\"\xb5\x01\n\nFileHashes\x12\x0e\n\x06signer\x18\x01 \x01(\x0c\x12)\n\nsignatures\x18\x02 \x03(\x0b\x32\x15.FileHashes.Signature\x1al\n\tSignature\x12\x10\n\x08\x66ilename\x18\x01 \x01(\t\x12\x14\n\x0ctest_signing\x18\x02 \x01(\x08\x12\x12\n\nSHA512Hash\x18\x03 \x01(\x0c\x12\x10\n\x08main_exe\x18\x04 \x01(\x08\x12\x11\n\tsignature\x18\x05 \x01(\x0c*1\n\x0bLicenseType\x12\x08\n\x04ZERO\x10\x00\x12\x0b\n\x07\x44\x45\x46\x41ULT\x10\x01\x12\x0b\n\x07OFFLINE\x10\x02*\x1e\n\x0fProtocolVersion\x12\x0b\n\x07\x43URRENT\x10\x15') + +_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals()) +_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'wv_proto2_pb2', globals()) +if _descriptor._USE_C_DESCRIPTORS == False: + + DESCRIPTOR._options = None + _LICENSETYPE._serialized_start = 8339 + _LICENSETYPE._serialized_end = 8388 + _PROTOCOLVERSION._serialized_start = 8390 + _PROTOCOLVERSION._serialized_end = 8420 + _CLIENTIDENTIFICATION._serialized_start = 20 + _CLIENTIDENTIFICATION._serialized_end = 763 + _CLIENTIDENTIFICATION_NAMEVALUE._serialized_start = 343 + _CLIENTIDENTIFICATION_NAMEVALUE._serialized_end = 383 + _CLIENTIDENTIFICATION_CLIENTCAPABILITIES._serialized_start = 386 + _CLIENTIDENTIFICATION_CLIENTCAPABILITIES._serialized_end = 678 + _CLIENTIDENTIFICATION_CLIENTCAPABILITIES_HDCPVERSION._serialized_start = 594 + _CLIENTIDENTIFICATION_CLIENTCAPABILITIES_HDCPVERSION._serialized_end = 678 + _CLIENTIDENTIFICATION_TOKENTYPE._serialized_start = 680 + _CLIENTIDENTIFICATION_TOKENTYPE._serialized_end = 763 + _DEVICECERTIFICATE._serialized_start = 766 + _DEVICECERTIFICATE._serialized_end = 1049 + _DEVICECERTIFICATE_CERTIFICATETYPE._serialized_start = 974 + _DEVICECERTIFICATE_CERTIFICATETYPE._serialized_end = 1049 + _DEVICECERTIFICATESTATUS._serialized_start = 1052 + _DEVICECERTIFICATESTATUS._serialized_end = 1248 + _DEVICECERTIFICATESTATUS_CERTIFICATESTATUS._serialized_start = 1205 + _DEVICECERTIFICATESTATUS_CERTIFICATESTATUS._serialized_end = 1248 + _DEVICECERTIFICATESTATUSLIST._serialized_start = 1250 + _DEVICECERTIFICATESTATUSLIST._serialized_end = 1361 + _ENCRYPTEDCLIENTIDENTIFICATION._serialized_start = 1364 + _ENCRYPTEDCLIENTIDENTIFICATION._serialized_end = 1539 + _LICENSEIDENTIFICATION._serialized_start = 1542 + _LICENSEIDENTIFICATION._serialized_end = 1698 + _LICENSE._serialized_start = 1701 + _LICENSE._serialized_end = 3526 + _LICENSE_POLICY._serialized_start = 1935 + _LICENSE_POLICY._serialized_end = 2250 + _LICENSE_KEYCONTAINER._serialized_start = 2253 + _LICENSE_KEYCONTAINER._serialized_end = 3526 + _LICENSE_KEYCONTAINER_OUTPUTPROTECTION._serialized_start = 2774 + _LICENSE_KEYCONTAINER_OUTPUTPROTECTION._serialized_end = 2993 + _LICENSE_KEYCONTAINER_OUTPUTPROTECTION_CGMS._serialized_start = 2926 + _LICENSE_KEYCONTAINER_OUTPUTPROTECTION_CGMS._serialized_end = 2993 + _LICENSE_KEYCONTAINER_KEYCONTROL._serialized_start = 2995 + _LICENSE_KEYCONTAINER_KEYCONTROL._serialized_end = 3044 + _LICENSE_KEYCONTAINER_OPERATORSESSIONKEYPERMISSIONS._serialized_start = 3046 + _LICENSE_KEYCONTAINER_OPERATORSESSIONKEYPERMISSIONS._serialized_end = 3170 + _LICENSE_KEYCONTAINER_VIDEORESOLUTIONCONSTRAINT._serialized_start = 3173 + _LICENSE_KEYCONTAINER_VIDEORESOLUTIONCONSTRAINT._serialized_end = 3326 + _LICENSE_KEYCONTAINER_KEYTYPE._serialized_start = 3328 + _LICENSE_KEYCONTAINER_KEYTYPE._serialized_end = 3402 + _LICENSE_KEYCONTAINER_SECURITYLEVEL._serialized_start = 3404 + _LICENSE_KEYCONTAINER_SECURITYLEVEL._serialized_end = 3526 + _LICENSEERROR._serialized_start = 3529 + _LICENSEERROR._serialized_end = 3681 + _LICENSEERROR_ERROR._serialized_start = 3585 + _LICENSEERROR_ERROR._serialized_end = 3681 + _LICENSEREQUEST._serialized_start = 3684 + _LICENSEREQUEST._serialized_end = 4624 + _LICENSEREQUEST_CONTENTIDENTIFICATION._serialized_start = 4028 + _LICENSEREQUEST_CONTENTIDENTIFICATION._serialized_end = 4574 + _LICENSEREQUEST_CONTENTIDENTIFICATION_CENC._serialized_start = 4245 + _LICENSEREQUEST_CONTENTIDENTIFICATION_CENC._serialized_end = 4340 + _LICENSEREQUEST_CONTENTIDENTIFICATION_WEBM._serialized_start = 4342 + _LICENSEREQUEST_CONTENTIDENTIFICATION_WEBM._serialized_end = 4418 + _LICENSEREQUEST_CONTENTIDENTIFICATION_EXISTINGLICENSE._serialized_start = 4421 + _LICENSEREQUEST_CONTENTIDENTIFICATION_EXISTINGLICENSE._serialized_end = 4574 + _LICENSEREQUEST_REQUESTTYPE._serialized_start = 4576 + _LICENSEREQUEST_REQUESTTYPE._serialized_end = 4624 + _LICENSEREQUESTRAW._serialized_start = 4627 + _LICENSEREQUESTRAW._serialized_end = 5564 + _LICENSEREQUESTRAW_CONTENTIDENTIFICATION._serialized_start = 4980 + _LICENSEREQUESTRAW_CONTENTIDENTIFICATION._serialized_end = 5514 + _LICENSEREQUESTRAW_CONTENTIDENTIFICATION_CENC._serialized_start = 5206 + _LICENSEREQUESTRAW_CONTENTIDENTIFICATION_CENC._serialized_end = 5280 + _LICENSEREQUESTRAW_CONTENTIDENTIFICATION_WEBM._serialized_start = 4342 + _LICENSEREQUESTRAW_CONTENTIDENTIFICATION_WEBM._serialized_end = 4418 + _LICENSEREQUESTRAW_CONTENTIDENTIFICATION_EXISTINGLICENSE._serialized_start = 4421 + _LICENSEREQUESTRAW_CONTENTIDENTIFICATION_EXISTINGLICENSE._serialized_end = 4574 + _LICENSEREQUESTRAW_REQUESTTYPE._serialized_start = 4576 + _LICENSEREQUESTRAW_REQUESTTYPE._serialized_end = 4624 + _PROVISIONEDDEVICEINFO._serialized_start = 5567 + _PROVISIONEDDEVICEINFO._serialized_end = 5861 + _PROVISIONEDDEVICEINFO_WVSECURITYLEVEL._serialized_start = 5782 + _PROVISIONEDDEVICEINFO_WVSECURITYLEVEL._serialized_end = 5861 + _PROVISIONINGOPTIONS._serialized_start = 5863 + _PROVISIONINGOPTIONS._serialized_end = 5884 + _PROVISIONINGREQUEST._serialized_start = 5886 + _PROVISIONINGREQUEST._serialized_end = 5907 + _PROVISIONINGRESPONSE._serialized_start = 5909 + _PROVISIONINGRESPONSE._serialized_end = 5931 + _REMOTEATTESTATION._serialized_start = 5933 + _REMOTEATTESTATION._serialized_end = 6038 + _SESSIONINIT._serialized_start = 6040 + _SESSIONINIT._serialized_end = 6053 + _SESSIONSTATE._serialized_start = 6055 + _SESSIONSTATE._serialized_end = 6069 + _SIGNEDCERTIFICATESTATUSLIST._serialized_start = 6071 + _SIGNEDCERTIFICATESTATUSLIST._serialized_end = 6100 + _SIGNEDDEVICECERTIFICATE._serialized_start = 6103 + _SIGNEDDEVICECERTIFICATE._serialized_end = 6237 + _SIGNEDPROVISIONINGMESSAGE._serialized_start = 6239 + _SIGNEDPROVISIONINGMESSAGE._serialized_end = 6266 + _SIGNEDMESSAGE._serialized_start = 6269 + _SIGNEDMESSAGE._serialized_end = 6552 + _SIGNEDMESSAGE_MESSAGETYPE._serialized_start = 6427 + _SIGNEDMESSAGE_MESSAGETYPE._serialized_end = 6552 + _WIDEVINECENCHEADER._serialized_start = 6555 + _WIDEVINECENCHEADER._serialized_end = 6880 + _WIDEVINECENCHEADER_ALGORITHM._serialized_start = 6840 + _WIDEVINECENCHEADER_ALGORITHM._serialized_end = 6880 + _SIGNEDLICENSEREQUEST._serialized_start = 6883 + _SIGNEDLICENSEREQUEST._serialized_end = 7197 + _SIGNEDLICENSEREQUEST_MESSAGETYPE._serialized_start = 6427 + _SIGNEDLICENSEREQUEST_MESSAGETYPE._serialized_end = 6552 + _SIGNEDLICENSEREQUESTRAW._serialized_start = 7200 + _SIGNEDLICENSEREQUESTRAW._serialized_end = 7523 + _SIGNEDLICENSEREQUESTRAW_MESSAGETYPE._serialized_start = 6427 + _SIGNEDLICENSEREQUESTRAW_MESSAGETYPE._serialized_end = 6552 + _SIGNEDLICENSE._serialized_start = 7526 + _SIGNEDLICENSE._serialized_end = 7819 + _SIGNEDLICENSE_MESSAGETYPE._serialized_start = 6427 + _SIGNEDLICENSE_MESSAGETYPE._serialized_end = 6552 + _SIGNEDSERVICECERTIFICATE._serialized_start = 7822 + _SIGNEDSERVICECERTIFICATE._serialized_end = 8153 + _SIGNEDSERVICECERTIFICATE_MESSAGETYPE._serialized_start = 6427 + _SIGNEDSERVICECERTIFICATE_MESSAGETYPE._serialized_end = 6552 + _FILEHASHES._serialized_start = 8156 + _FILEHASHES._serialized_end = 8337 + _FILEHASHES_SIGNATURE._serialized_start = 8229 + _FILEHASHES_SIGNATURE._serialized_end = 8337 +# @@protoc_insertion_point(module_scope) + +class Session: + def __init__(self, session_id, init_data, device_config, offline): + self.session_id = session_id + self.init_data = init_data + self.offline = offline + self.device_config = device_config + self.device_key = None + self.session_key = None + self.derived_keys = { + 'enc': None, + 'auth_1': None, + 'auth_2': None + } + self.license_request = None + self.license = None + self.service_certificate = None + self.privacy_mode = False + self.keys = [] + +class Key: + def __init__(self, kid, type, key, permissions=[]): + self.kid = kid + self.type = type + self.key = key + self.permissions = permissions + + def __repr__(self): + if self.type == "OPERATOR_SESSION": + return "key(kid={}, type={}, key={}, permissions={})".format(self.kid, self.type, binascii.hexlify(self.key), self.permissions) + else: + return "key(kid={}, type={}, key={})".format(self.kid, self.type, binascii.hexlify(self.key)) + +try: + from google.protobuf.internal.decoder import _DecodeVarint as _di +except ImportError: + def LEB128_decode(buffer, pos, limit=64): + result = 0 + shift = 0 + while True: + b = buffer[pos] + pos += 1 + result |= ((b & 0x7F) << shift) + if not (b & 0x80): + return (result, pos) + shift += 7 + if shift > limit: + raise Exception("integer too large, shift: {}".format(shift)) + _di = LEB128_decode + +class FromFileMixin: + @classmethod + def from_file(cls, filename): + with open(filename, "rb") as f: + return cls(f.read()) + +class VariableReader(FromFileMixin): + def __init__(self, buf): + self.buf = buf + self.pos = 0 + self.size = len(buf) + + def read_int(self): + (val, nextpos) = _di(self.buf, self.pos) + self.pos = nextpos + return val + + def read_bytes_raw(self, size): + b = self.buf[self.pos:self.pos+size] + self.pos += size + return b + + def read_bytes(self): + size = self.read_int() + return self.read_bytes_raw(size) + + def is_end(self): + return (self.size == self.pos) + +class TaggedReader(VariableReader): + def read_tag(self): + return (self.read_int(), self.read_bytes()) + + def read_all_tags(self, max_tag=3): + tags = {} + while (not self.is_end()): + (tag, bytes) = self.read_tag() + if (tag > max_tag): + raise IndexError("tag out of bound: got {}, max {}".format(tag, max_tag)) + tags[tag] = bytes + return tags + +class WideVineSignatureReader(FromFileMixin): + SIGNER_TAG = 1 + SIGNATURE_TAG = 2 + ISMAINEXE_TAG = 3 + + def __init__(self, buf): + reader = TaggedReader(buf) + self.version = reader.read_int() + if (self.version != 0): + raise Exception("Unsupported signature format version {}".format(self.version)) + self.tags = reader.read_all_tags() + + self.signer = self.tags[self.SIGNER_TAG] + self.signature = self.tags[self.SIGNATURE_TAG] + + extra = self.tags[self.ISMAINEXE_TAG] + if (len(extra) != 1 or (extra[0] > 1)): + raise Exception("Unexpected 'ismainexe' field value (not '\\x00' or '\\x01'), please check: {0}".format(extra)) + + self.mainexe = bool(extra[0]) + + @classmethod + def get_tags(cls, filename): + return cls.from_file(filename).tags + +device_android_generic = { + 'name': 'android_generic', + 'description': 'android studio cdm', + 'security_level': 3, + 'session_id_type': 'android', + 'private_key_available': True, + 'vmp': False, + 'send_key_control_nonce': True +} +devices_available = [device_android_generic] + +FILES_FOLDER = 'devices' + +class DeviceConfig: + def __init__(self, device): + self.device_name = device['name'] + self.description = device['description'] + self.security_level = device['security_level'] + self.session_id_type = device['session_id_type'] + self.private_key_available = device['private_key_available'] + self.vmp = device['vmp'] + self.send_key_control_nonce = device['send_key_control_nonce'] + + if 'keybox_filename' in device: + self.keybox_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], device['keybox_filename']) + else: + self.keybox_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], 'keybox') + + if 'device_cert_filename' in device: + self.device_cert_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], device['device_cert_filename']) + else: + self.device_cert_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], 'device_cert') + + if 'device_private_key_filename' in device: + self.device_private_key_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], device['device_private_key_filename']) + else: + self.device_private_key_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], 'device_private_key') + + if 'device_client_id_blob_filename' in device: + self.device_client_id_blob_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], device['device_client_id_blob_filename']) + else: + self.device_client_id_blob_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], 'device_client_id_blob') + + if 'device_vmp_blob_filename' in device: + self.device_vmp_blob_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], device['device_vmp_blob_filename']) + else: + self.device_vmp_blob_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], 'device_vmp_blob') + + def __repr__(self): + return "DeviceConfig(name={}, description={}, security_level={}, session_id_type={}, private_key_available={}, vmp={})".format(self.device_name, self.description, self.security_level, self.session_id_type, self.private_key_available, self.vmp) + +class Cdm: + def __init__(self): + self.logger = logging.getLogger(__name__) + self.sessions = {} + + def open_session(self, init_data_b64, device, raw_init_data = None, offline=False): + self.logger.debug("open_session(init_data_b64={}, device={}".format(init_data_b64, device)) + self.logger.info("opening new cdm session") + if device.session_id_type == 'android': + # format: 16 random hexdigits, 2 digit counter, 14 0s + rand_ascii = ''.join(random.choice('ABCDEF0123456789') for _ in range(16)) + counter = '01' # this resets regularly so its fine to use 01 + rest = '00000000000000' + session_id = rand_ascii + counter + rest + session_id = session_id.encode('ascii') + elif device.session_id_type == 'chrome': + rand_bytes = get_random_bytes(16) + session_id = rand_bytes + else: + # other formats NYI + self.logger.error("device type is unusable") + return 1 + if raw_init_data and isinstance(raw_init_data, (bytes, bytearray)): + # used for NF key exchange, where they don't provide a valid PSSH + init_data = raw_init_data + self.raw_pssh = True + else: + init_data = self._parse_init_data(init_data_b64) + self.raw_pssh = False + + if init_data: + new_session = Session(session_id, init_data, device, offline) + else: + self.logger.error("unable to parse init data") + return 1 + self.sessions[session_id] = new_session + self.logger.info("session opened and init data parsed successfully") + return session_id + + def _parse_init_data(self, init_data_b64): + parsed_init_data = WidevineCencHeader() + try: + self.logger.debug("trying to parse init_data directly") + parsed_init_data.ParseFromString(base64.b64decode(init_data_b64)[32:]) + except DecodeError: + self.logger.debug("unable to parse as-is, trying with removed pssh box header") + try: + id_bytes = parsed_init_data.ParseFromString(base64.b64decode(init_data_b64)[32:]) + except DecodeError: + self.logger.error("unable to parse, unsupported init data format") + return None + self.logger.debug("init_data:") + for line in text_format.MessageToString(parsed_init_data).splitlines(): + self.logger.debug(line) + return parsed_init_data + + def close_session(self, session_id): + self.logger.debug("close_session(session_id={})".format(session_id)) + self.logger.info("closing cdm session") + if session_id in self.sessions: + self.sessions.pop(session_id) + self.logger.info("cdm session closed") + return 0 + else: + self.logger.info("session {} not found".format(session_id)) + return 1 + + def set_service_certificate(self, session_id, cert_b64): + self.logger.debug("set_service_certificate(session_id={}, cert={})".format(session_id, cert_b64)) + self.logger.info("setting service certificate") + + if session_id not in self.sessions: + self.logger.error("session id doesn't exist") + return 1 + + session = self.sessions[session_id] + + message = SignedMessage() + + try: + message.ParseFromString(base64.b64decode(cert_b64)) + except DecodeError: + self.logger.error("failed to parse cert as SignedMessage") + + service_certificate = SignedDeviceCertificate() + + if message.Type: + self.logger.debug("service cert provided as signedmessage") + try: + service_certificate.ParseFromString(message.Msg) + except DecodeError: + self.logger.error("failed to parse service certificate") + return 1 + else: + self.logger.debug("service cert provided as signeddevicecertificate") + try: + service_certificate.ParseFromString(base64.b64decode(cert_b64)) + except DecodeError: + self.logger.error("failed to parse service certificate") + return 1 + + self.logger.debug("service certificate:") + for line in text_format.MessageToString(service_certificate).splitlines(): + self.logger.debug(line) + + session.service_certificate = service_certificate + session.privacy_mode = True + + return 0 + + def get_license_request(self, session_id): + self.logger.debug("get_license_request(session_id={})".format(session_id)) + self.logger.info("getting license request") + + if session_id not in self.sessions: + self.logger.error("session ID does not exist") + return 1 + + session = self.sessions[session_id] + + # raw pssh will be treated as bytes and not parsed + if self.raw_pssh: + license_request = SignedLicenseRequestRaw() + else: + license_request = SignedLicenseRequest() + client_id = ClientIdentification() + + if not os.path.exists(session.device_config.device_client_id_blob_filename): + self.logger.error("no client ID blob available for this device") + return 1 + + with open(session.device_config.device_client_id_blob_filename, "rb") as f: + try: + cid_bytes = client_id.ParseFromString(f.read()) + except DecodeError: + self.logger.error("client id failed to parse as protobuf") + return 1 + + self.logger.debug("building license request") + if not self.raw_pssh: + license_request.Type = SignedLicenseRequest.MessageType.Value('LICENSE_REQUEST') + license_request.Msg.ContentId.CencId.Pssh.CopyFrom(session.init_data) + else: + license_request.Type = SignedLicenseRequestRaw.MessageType.Value('LICENSE_REQUEST') + license_request.Msg.ContentId.CencId.Pssh = session.init_data # bytes + + if session.offline: + license_type = LicenseType.Value('OFFLINE') + else: + license_type = LicenseType.Value('DEFAULT') + license_request.Msg.ContentId.CencId.LicenseType = license_type + license_request.Msg.ContentId.CencId.RequestId = session_id + license_request.Msg.Type = LicenseRequest.RequestType.Value('NEW') + license_request.Msg.RequestTime = int(time.time()) + license_request.Msg.ProtocolVersion = ProtocolVersion.Value('CURRENT') + if session.device_config.send_key_control_nonce: + license_request.Msg.KeyControlNonce = random.randrange(1, 2**31) + + if session.privacy_mode: + if session.device_config.vmp: + self.logger.debug("vmp required, adding to client_id") + self.logger.debug("reading vmp hashes") + vmp_hashes = FileHashes() + with open(session.device_config.device_vmp_blob_filename, "rb") as f: + try: + vmp_bytes = vmp_hashes.ParseFromString(f.read()) + except DecodeError: + self.logger.error("vmp hashes failed to parse as protobuf") + return 1 + client_id._FileHashes.CopyFrom(vmp_hashes) + self.logger.debug("privacy mode & service certificate loaded, encrypting client id") + self.logger.debug("unencrypted client id:") + for line in text_format.MessageToString(client_id).splitlines(): + self.logger.debug(line) + cid_aes_key = get_random_bytes(16) + cid_iv = get_random_bytes(16) + + cid_cipher = AES.new(cid_aes_key, AES.MODE_CBC, cid_iv) + + encrypted_client_id = cid_cipher.encrypt(Padding.pad(client_id.SerializeToString(), 16)) + + service_public_key = RSA.importKey(session.service_certificate._DeviceCertificate.PublicKey) + + service_cipher = PKCS1_OAEP.new(service_public_key) + + encrypted_cid_key = service_cipher.encrypt(cid_aes_key) + + encrypted_client_id_proto = EncryptedClientIdentification() + + encrypted_client_id_proto.ServiceId = session.service_certificate._DeviceCertificate.ServiceId + encrypted_client_id_proto.ServiceCertificateSerialNumber = session.service_certificate._DeviceCertificate.SerialNumber + encrypted_client_id_proto.EncryptedClientId = encrypted_client_id + encrypted_client_id_proto.EncryptedClientIdIv = cid_iv + encrypted_client_id_proto.EncryptedPrivacyKey = encrypted_cid_key + + license_request.Msg.EncryptedClientId.CopyFrom(encrypted_client_id_proto) + else: + license_request.Msg.ClientId.CopyFrom(client_id) + + if session.device_config.private_key_available: + key = RSA.importKey(open(session.device_config.device_private_key_filename).read()) + session.device_key = key + else: + self.logger.error("need device private key, other methods unimplemented") + return 1 + + self.logger.debug("signing license request") + + hash = SHA1.new(license_request.Msg.SerializeToString()) + signature = pss.new(key).sign(hash) + + license_request.Signature = signature + + session.license_request = license_request + + self.logger.debug("license request:") + for line in text_format.MessageToString(session.license_request).splitlines(): + self.logger.debug(line) + self.logger.info("license request created") + self.logger.debug("license request b64: {}".format(base64.b64encode(license_request.SerializeToString()))) + return license_request.SerializeToString() + + def provide_license(self, session_id, license_b64): + self.logger.debug("provide_license(session_id={}, license_b64={})".format(session_id, license_b64)) + self.logger.info("decrypting provided license") + + if session_id not in self.sessions: + self.logger.error("session does not exist") + return 1 + + session = self.sessions[session_id] + + if not session.license_request: + self.logger.error("generate a license request first!") + return 1 + + license = SignedLicense() + try: + license.ParseFromString(base64.b64decode(license_b64)) + except DecodeError: + self.logger.error("unable to parse license - check protobufs") + return 1 + + session.license = license + + self.logger.debug("license:") + for line in text_format.MessageToString(license).splitlines(): + self.logger.debug(line) + + self.logger.debug("deriving keys from session key") + + oaep_cipher = PKCS1_OAEP.new(session.device_key) + + session.session_key = oaep_cipher.decrypt(license.SessionKey) + + lic_req_msg = session.license_request.Msg.SerializeToString() + + enc_key_base = b"ENCRYPTION\000" + lic_req_msg + b"\0\0\0\x80" + auth_key_base = b"AUTHENTICATION\0" + lic_req_msg + b"\0\0\2\0" + + enc_key = b"\x01" + enc_key_base + auth_key_1 = b"\x01" + auth_key_base + auth_key_2 = b"\x02" + auth_key_base + auth_key_3 = b"\x03" + auth_key_base + auth_key_4 = b"\x04" + auth_key_base + + cmac_obj = CMAC.new(session.session_key, ciphermod=AES) + cmac_obj.update(enc_key) + + enc_cmac_key = cmac_obj.digest() + + cmac_obj = CMAC.new(session.session_key, ciphermod=AES) + cmac_obj.update(auth_key_1) + auth_cmac_key_1 = cmac_obj.digest() + + cmac_obj = CMAC.new(session.session_key, ciphermod=AES) + cmac_obj.update(auth_key_2) + auth_cmac_key_2 = cmac_obj.digest() + + cmac_obj = CMAC.new(session.session_key, ciphermod=AES) + cmac_obj.update(auth_key_3) + auth_cmac_key_3 = cmac_obj.digest() + + cmac_obj = CMAC.new(session.session_key, ciphermod=AES) + cmac_obj.update(auth_key_4) + auth_cmac_key_4 = cmac_obj.digest() + + auth_cmac_combined_1 = auth_cmac_key_1 + auth_cmac_key_2 + auth_cmac_combined_2 = auth_cmac_key_3 + auth_cmac_key_4 + + session.derived_keys['enc'] = enc_cmac_key + session.derived_keys['auth_1'] = auth_cmac_combined_1 + session.derived_keys['auth_2'] = auth_cmac_combined_2 + + self.logger.debug('verifying license signature') + + lic_hmac = HMAC.new(session.derived_keys['auth_1'], digestmod=SHA256) + lic_hmac.update(license.Msg.SerializeToString()) + + self.logger.debug("calculated sig: {} actual sig: {}".format(lic_hmac.hexdigest(), binascii.hexlify(license.Signature))) + + if lic_hmac.digest() != license.Signature: + self.logger.info("license signature doesn't match - writing bin so they can be debugged") + with open("original_lic.bin", "wb") as f: + f.write(base64.b64decode(license_b64)) + with open("parsed_lic.bin", "wb") as f: + f.write(license.SerializeToString()) + self.logger.info("continuing anyway") + + self.logger.debug("key count: {}".format(len(license.Msg.Key))) + for key in license.Msg.Key: + if key.Id: + key_id = key.Id + else: + key_id = License.KeyContainer.KeyType.Name(key.Type).encode('utf-8') + encrypted_key = key.Key + iv = key.Iv + type = License.KeyContainer.KeyType.Name(key.Type) + + cipher = AES.new(session.derived_keys['enc'], AES.MODE_CBC, iv=iv) + decrypted_key = cipher.decrypt(encrypted_key) + if type == "OPERATOR_SESSION": + permissions = [] + perms = key._OperatorSessionKeyPermissions + for (descriptor, value) in perms.ListFields(): + if value == 1: + permissions.append(descriptor.name) + print(permissions) + else: + permissions = [] + session.keys.append(Key(key_id, type, Padding.unpad(decrypted_key, 16), permissions)) + + self.logger.info("decrypted all keys") + return 0 + + def get_keys(self, session_id): + if session_id in self.sessions: + return self.sessions[session_id].keys + else: + self.logger.error("session not found") + return 1 + +class WvDecrypt(object): + WV_SYSTEM_ID = [ + 237, 239, 139, 169, 121, 214, 74, 206, 163, 200, 39, 220, 213, 29, 33, 237] + + def __init__(self, init_data_b64, cert_data_b64, device): + self.init_data_b64 = init_data_b64 + self.cert_data_b64 = cert_data_b64 + self.device = device + self.cdm = Cdm() + + def check_pssh(pssh_b64): + pssh = base64.b64decode(pssh_b64) + if not pssh[12:28] == bytes(self.WV_SYSTEM_ID): + new_pssh = bytearray([0, 0, 0]) + new_pssh.append(32 + len(pssh)) + new_pssh[4:] = bytearray(b'pssh') + new_pssh[8:] = [0, 0, 0, 0] + new_pssh[13:] = self.WV_SYSTEM_ID + new_pssh[29:] = [0, 0, 0, 0] + new_pssh[31] = len(pssh) + new_pssh[32:] = pssh + return base64.b64encode(new_pssh) + else: + return pssh_b64 + + self.session = self.cdm.open_session(check_pssh(self.init_data_b64), DeviceConfig(self.device)) + if self.cert_data_b64: + self.cdm.set_service_certificate(self.session, self.cert_data_b64) + + def log_message(self, msg): + return '{}'.format(msg) + + def start_process(self): + keyswvdecrypt = [] + try: + for key in self.cdm.get_keys(self.session): + if key.type == 'CONTENT': + keyswvdecrypt.append(self.log_message('{}:{}'.format(key.kid.hex(), key.key.hex()))) + + except Exception: + return ( + False, keyswvdecrypt) + else: + return ( + True, keyswvdecrypt) + + def get_challenge(self): + return self.cdm.get_license_request(self.session) + + def update_license(self, license_b64): + self.cdm.provide_license(self.session, license_b64) + return True + +class PsshExtractor: + def __init__(self, response_text): + self.response_text = response_text + + def extract_pssh(self): + pssh_match = re.search(r'.*?(.*?)', self.response_text, re.DOTALL) + + if pssh_match: + return pssh_match.group(1) + else: + cenc_default_kid_match = re.search(r'cenc:default_KID="([^"]+)"', self.response_text) + if cenc_default_kid_match: + kid = cenc_default_kid_match.group(1) + array_of_bytes = bytearray(b'\x00\x00\x002pssh\x00\x00\x00\x00') + array_of_bytes.extend(bytes.fromhex("edef8ba979d64acea3c827dcd51d21ed")) + array_of_bytes.extend(b'\x00\x00\x00\x12\x12\x10') + array_of_bytes.extend(bytes.fromhex(str(kid).replace("-", ""))) + pssh = base64.b64encode(bytes.fromhex(array_of_bytes.hex())).decode("utf-8") + return pssh + else: + return None +class KeyExtractor: + def __init__(self, pssh_value, cert_b64, license_url, headers): + self.pssh_value = pssh_value + self.cert_b64 = cert_b64 + self.license_url = license_url + self.headers = headers + + def get_keys(self): + wvdecrypt = WvDecrypt(init_data_b64=self.pssh_value, cert_data_b64=self.cert_b64, device=device_android_generic) + raw_challenge = wvdecrypt.get_challenge() + data = raw_challenge + + response = requests.post(self.license_url, headers=self.headers, data=data) + license_b64 = b64encode(response.content) + wvdecrypt.update_license(license_b64) + keys = wvdecrypt.start_process() + return keys \ No newline at end of file diff --git a/main.py b/main.py new file mode 100644 index 0000000..211203e --- /dev/null +++ b/main.py @@ -0,0 +1,43 @@ +import argparse +from cdm.wks import WvDecrypt, device_android_generic, PsshExtractor, KeyExtractor +import requests + +def get_keys_license(mpd_url, license_url): + response = requests.get(mpd_url) + pssh_extractor = PsshExtractor(response.text) + pssh_value = pssh_extractor.extract_pssh() + + print("PSSH value:", pssh_value) + + headers = { + 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36', + } + + cert_b64 = None + key_extractor = KeyExtractor(pssh_value, cert_b64, license_url, headers) + keys = key_extractor.get_keys() + wvdecrypt = WvDecrypt(init_data_b64=pssh_value, cert_data_b64=cert_b64, device=device_android_generic) + raw_challenge = wvdecrypt.get_challenge() + data = raw_challenge + + return keys + +def main(): + parser = argparse.ArgumentParser(description="Decrypt Widevine content using MPD URL and License URL") + parser.add_argument("-mpd", required=True, help="URL of the MPD manifest") + parser.add_argument("-lic", required=True, help="URL of the license server") + args = parser.parse_args() + + mpd_url = args.mpd + license_url = args.lic + + keys = get_keys_license(mpd_url, license_url) + + for key in keys: + if isinstance(key, list): + if key: + for key_str in key: + print(f"KEY: {key_str}") + +if __name__ == "__main__": + main()