add plugin "auth_sha1_v2"
This commit is contained in:
BreakWa11
parent
187e266b26
commit
397990534a
2 changed files with 251 additions and 1 deletions
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@ -32,7 +32,7 @@ import hmac
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import hashlib
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import shadowsocks
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from shadowsocks import common
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from shadowsocks import common, lru_cache
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from shadowsocks.obfsplugin import plain
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from shadowsocks.common import to_bytes, to_str, ord, chr
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@ -42,10 +42,15 @@ def create_auth_simple(method):
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def create_auth_sha1(method):
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return auth_sha1(method)
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def create_auth_sha1_v2(method):
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return auth_sha1_v2(method)
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obfs_map = {
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'auth_simple': (create_auth_simple,),
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'auth_sha1': (create_auth_sha1,),
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'auth_sha1_compatible': (create_auth_sha1,),
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'auth_sha1_v2': (create_auth_sha1_v2,),
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'auth_sha1_v2_compatible': (create_auth_sha1_v2,),
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}
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def match_begin(str1, str2):
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@ -526,3 +531,244 @@ class auth_sha1(verify_base):
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self.decrypt_packet_num += 1
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return out_buf
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class obfs_auth_v2_data(object):
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def __init__(self):
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self.client_id = lru_cache.LRUCache()
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self.local_client_id = b''
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self.connection_id = 0
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self.set_max_client(64) # max active client count
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def update(self, client_id, connection_id):
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if client_id in self.client_id:
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self.client_id[client_id].update()
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def set_max_client(self, max_client):
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self.max_client = max_client
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self.max_buffer = max(self.max_client * 2, 1024)
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def insert(self, client_id, connection_id):
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if self.client_id.get(client_id, None) is None or not self.client_id[client_id].enable:
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if self.client_id.first() is None or len(self.client_id) < self.max_client:
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if client_id not in self.client_id:
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#TODO: check
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self.client_id[client_id] = client_queue(connection_id)
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else:
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self.client_id[client_id].re_enable(connection_id)
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return self.client_id[client_id].insert(connection_id)
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if not self.client_id[self.client_id.first()].is_active():
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del self.client_id[self.client_id.first()]
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if client_id not in self.client_id:
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#TODO: check
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self.client_id[client_id] = client_queue(connection_id)
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else:
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self.client_id[client_id].re_enable(connection_id)
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return self.client_id[client_id].insert(connection_id)
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logging.warn('auth_sha1_v2: no inactive client')
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return False
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else:
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return self.client_id[client_id].insert(connection_id)
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class auth_sha1_v2(verify_base):
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def __init__(self, method):
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super(auth_sha1_v2, self).__init__(method)
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self.recv_buf = b''
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self.unit_len = 8100
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self.decrypt_packet_num = 0
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self.raw_trans = False
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self.has_sent_header = False
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self.has_recv_header = False
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self.client_id = 0
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self.connection_id = 0
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def init_data(self):
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return obfs_auth_v2_data()
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def set_server_info(self, server_info):
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self.server_info = server_info
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try:
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max_client = int(server_info.protocol_param)
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except:
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max_client = 64
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self.server_info.data.set_max_client(max_client)
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def rnd_data(self, buf_size):
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if buf_size > 1500:
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return b'\x01'
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if buf_size > 400:
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rnd_data = os.urandom(common.ord(os.urandom(1)[0]) % 128)
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return common.chr(len(rnd_data) + 1) + rnd_data
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rnd_data = os.urandom(struct.unpack('>H', os.urandom(2))[0] % 1024)
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return common.chr(255) + struct.pack('>H', len(rnd_data) + 3) + rnd_data
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def pack_data(self, buf):
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if len(buf) == 0:
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return b''
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data = self.rnd_data(len(buf)) + buf
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data = struct.pack('>H', len(data) + 6) + data
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adler32 = zlib.adler32(data) & 0xFFFFFFFF
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data += struct.pack('<I', adler32)
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return data
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def pack_auth_data(self, buf):
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if len(buf) == 0:
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return b''
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data = self.rnd_data(len(buf)) + buf
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data = struct.pack('>H', len(data) + 16) + data
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crc = binascii.crc32(self.server_info.key) & 0xFFFFFFFF
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data = struct.pack('<I', crc) + data
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data += hmac.new(self.server_info.iv + self.server_info.key, data, hashlib.sha1).digest()[:10]
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return data
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def auth_data(self):
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if self.server_info.data.connection_id > 0xFF000000:
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self.server_info.data.local_client_id = b''
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if not self.server_info.data.local_client_id:
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self.server_info.data.local_client_id = os.urandom(8)
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logging.debug("local_client_id %s" % (binascii.hexlify(self.server_info.data.local_client_id),))
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self.server_info.data.connection_id = struct.unpack('<Q', self.server_info.data.local_client_id)[0] % 0xFFFFFD
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self.server_info.data.connection_id += 1
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return b''.join([self.server_info.data.local_client_id,
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struct.pack('<I', self.server_info.data.connection_id)])
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def client_pre_encrypt(self, buf):
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ret = b''
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if not self.has_sent_header:
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head_size = self.get_head_size(buf, 30)
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datalen = min(len(buf), random.randint(0, 31) + head_size)
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ret += self.pack_auth_data(self.auth_data() + buf[:datalen])
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buf = buf[datalen:]
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self.has_sent_header = True
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while len(buf) > self.unit_len:
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ret += self.pack_data(buf[:self.unit_len])
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buf = buf[self.unit_len:]
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ret += self.pack_data(buf)
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return ret
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def client_post_decrypt(self, buf):
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if self.raw_trans:
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return buf
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self.recv_buf += buf
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out_buf = b''
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while len(self.recv_buf) > 2:
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length = struct.unpack('>H', self.recv_buf[:2])[0]
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if length >= 8192 or length < 7:
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self.raw_trans = True
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self.recv_buf = b''
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raise Exception('client_post_decrypt data error')
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if length > len(self.recv_buf):
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break
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if struct.pack('<I', zlib.adler32(self.recv_buf[:length - 4]) & 0xFFFFFFFF) != self.recv_buf[length - 4:length]:
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self.raw_trans = True
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self.recv_buf = b''
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raise Exception('client_post_decrypt data uncorrect checksum')
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pos = common.ord(self.recv_buf[2])
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if pos < 255:
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pos += 2
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else:
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pos = struct.unpack('>H', self.recv_buf[3:5])[0] + 2
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out_buf += self.recv_buf[pos:length - 4]
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self.recv_buf = self.recv_buf[length:]
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if out_buf:
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self.decrypt_packet_num += 1
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return out_buf
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def server_pre_encrypt(self, buf):
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if self.raw_trans:
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return buf
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ret = b''
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while len(buf) > self.unit_len:
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ret += self.pack_data(buf[:self.unit_len])
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buf = buf[self.unit_len:]
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ret += self.pack_data(buf)
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return ret
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def server_post_decrypt(self, buf):
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if self.raw_trans:
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return buf
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self.recv_buf += buf
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out_buf = b''
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if not self.has_recv_header:
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if len(self.recv_buf) < 4:
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return b''
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crc = struct.pack('<I', binascii.crc32(self.server_info.key) & 0xFFFFFFFF)
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if crc != self.recv_buf[:4]:
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if self.method == 'auth_sha1_v2':
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return b'E'
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else:
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self.raw_trans = True
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return self.recv_buf
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length = struct.unpack('>H', self.recv_buf[4:6])[0]
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if length > len(self.recv_buf):
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return b''
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sha1data = hmac.new(self.server_info.recv_iv + self.server_info.key, self.recv_buf[:length - 10], hashlib.sha1).digest()[:10]
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if sha1data != self.recv_buf[length - 10:length]:
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logging.error('auth_sha1_v2 data uncorrect auth HMAC-SHA1')
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return b'E'
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pos = common.ord(self.recv_buf[6])
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if pos < 255:
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pos += 6
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else:
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pos = struct.unpack('>H', self.recv_buf[7:9])[0] + 6
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out_buf = self.recv_buf[pos:length - 10]
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if len(out_buf) < 8:
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self.raw_trans = True
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self.recv_buf = b''
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logging.info('auth_sha1_v2: too short')
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return b'E'
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client_id = struct.unpack('<Q', out_buf[:8])[0]
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connection_id = struct.unpack('<I', out_buf[8:12])[0]
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if self.server_info.data.insert(client_id, connection_id):
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self.has_recv_header = True
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out_buf = out_buf[12:]
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self.client_id = client_id
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self.connection_id = connection_id
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else:
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self.raw_trans = True
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self.recv_buf = b''
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logging.info('auth_sha1_v2: auth fail, data %s' % (binascii.hexlify(out_buf),))
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return b'E'
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self.recv_buf = self.recv_buf[length:]
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self.has_recv_header = True
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while len(self.recv_buf) > 2:
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length = struct.unpack('>H', self.recv_buf[:2])[0]
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if length >= 8192 or length < 7:
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self.raw_trans = True
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self.recv_buf = b''
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if self.decrypt_packet_num == 0:
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logging.info('auth_sha1_v2: over size')
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return b'E'
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else:
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raise Exception('server_post_decrype data error')
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if length > len(self.recv_buf):
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break
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if struct.pack('<I', zlib.adler32(self.recv_buf[:length - 4]) & 0xFFFFFFFF) != self.recv_buf[length - 4:length]:
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logging.info('auth_sha1: checksum error, data %s' % (binascii.hexlify(self.recv_buf[:length]),))
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self.raw_trans = True
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self.recv_buf = b''
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if self.decrypt_packet_num == 0:
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return b'E'
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else:
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raise Exception('server_post_decrype data uncorrect checksum')
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pos = common.ord(self.recv_buf[2])
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if pos < 255:
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pos += 2
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else:
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pos = struct.unpack('>H', self.recv_buf[3:5])[0] + 2
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out_buf += self.recv_buf[pos:length - 4]
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self.recv_buf = self.recv_buf[length:]
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if out_buf:
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self.server_info.data.update(self.client_id, self.connection_id)
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self.decrypt_packet_num += 1
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return out_buf
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