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587 lines
22 KiB
587 lines
22 KiB
#!/usr/bin/env python
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#
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# Copyright 2015-2015 breakwa11
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from __future__ import absolute_import, division, print_function, \
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with_statement
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import os
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import sys
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import hashlib
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import logging
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import binascii
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import base64
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import time
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import datetime
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import random
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import math
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import struct
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import zlib
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import hmac
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import hashlib
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import shadowsocks
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from shadowsocks import common, lru_cache, encrypt
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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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def create_auth_chain_a(method):
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return auth_chain_a(method)
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obfs_map = {
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'auth_chain_a': (create_auth_chain_a,),
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}
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class xorshift128plus(object):
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max_int = (1 << 64) - 1
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mov_mask = (1 << (64 - 23)) - 1
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def __init__(self):
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self.v0 = 0
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self.v1 = 0
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def next(self):
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x = self.v0
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y = self.v1
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self.v0 = y
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x ^= ((x & xorshift128plus.mov_mask) << 23)
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x ^= (y ^ (x >> 17) ^ (y >> 26)) & xorshift128plus.max_int
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self.v1 = x
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return (x + y) & xorshift128plus.max_int
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def init_from_bin(self, bin):
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bin += b'\0' * 16
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self.v0 = struct.unpack('<Q', bin[:8])[0]
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self.v1 = struct.unpack('<Q', bin[8:16])[0]
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def init_from_bin_len(self, bin, length):
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bin += b'\0' * 16
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bin = struct.pack('<H', length) + bin[2:]
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self.v0 = struct.unpack('<Q', bin[:8])[0]
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self.v1 = struct.unpack('<Q', bin[8:16])[0]
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for i in range(4):
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self.next()
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def match_begin(str1, str2):
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if len(str1) >= len(str2):
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if str1[:len(str2)] == str2:
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return True
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return False
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class auth_base(plain.plain):
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def __init__(self, method):
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super(auth_base, self).__init__(method)
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self.method = method
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self.no_compatible_method = ''
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self.overhead = 4
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def init_data(self):
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return ''
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def get_overhead(self, direction): # direction: true for c->s false for s->c
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return self.overhead
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def set_server_info(self, server_info):
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self.server_info = server_info
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def client_encode(self, buf):
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return buf
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def client_decode(self, buf):
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return (buf, False)
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def server_encode(self, buf):
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return buf
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def server_decode(self, buf):
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return (buf, True, False)
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def not_match_return(self, buf):
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self.raw_trans = True
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self.overhead = 0
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if self.method == self.no_compatible_method:
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return (b'E'*2048, False)
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return (buf, False)
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class client_queue(object):
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def __init__(self, begin_id):
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self.front = begin_id - 64
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self.back = begin_id + 1
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self.alloc = {}
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self.enable = True
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self.last_update = time.time()
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self.ref = 0
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def update(self):
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self.last_update = time.time()
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def addref(self):
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self.ref += 1
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def delref(self):
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if self.ref > 0:
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self.ref -= 1
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def is_active(self):
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return (self.ref > 0) and (time.time() - self.last_update < 60 * 10)
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def re_enable(self, connection_id):
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self.enable = True
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self.front = connection_id - 64
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self.back = connection_id + 1
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self.alloc = {}
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def insert(self, connection_id):
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if not self.enable:
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logging.warn('obfs auth: not enable')
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return False
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if not self.is_active():
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self.re_enable(connection_id)
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self.update()
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if connection_id < self.front:
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logging.warn('obfs auth: deprecated id, someone replay attack')
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return False
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if connection_id > self.front + 0x4000:
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logging.warn('obfs auth: wrong id')
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return False
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if connection_id in self.alloc:
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logging.warn('obfs auth: duplicate id, someone replay attack')
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return False
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if self.back <= connection_id:
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self.back = connection_id + 1
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self.alloc[connection_id] = 1
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while (self.front in self.alloc) or self.front + 0x1000 < self.back:
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if self.front in self.alloc:
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del self.alloc[self.front]
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self.front += 1
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self.addref()
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return True
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class obfs_auth_chain_data(object):
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def __init__(self, name):
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self.name = name
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self.user_id = {}
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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, user_id, client_id, connection_id):
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if user_id not in self.user_id:
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self.user_id[user_id] = lru_cache.LRUCache()
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local_client_id = self.user_id[user_id]
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if client_id in local_client_id:
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local_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, user_id, client_id, connection_id):
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if user_id not in self.user_id:
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self.user_id[user_id] = lru_cache.LRUCache()
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local_client_id = self.user_id[user_id]
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if local_client_id.get(client_id, None) is None or not local_client_id[client_id].enable:
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if local_client_id.first() is None or len(local_client_id) < self.max_client:
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if client_id not in local_client_id:
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#TODO: check
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local_client_id[client_id] = client_queue(connection_id)
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else:
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local_client_id[client_id].re_enable(connection_id)
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return local_client_id[client_id].insert(connection_id)
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if not local_client_id[local_client_id.first()].is_active():
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del local_client_id[local_client_id.first()]
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if client_id not in local_client_id:
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#TODO: check
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local_client_id[client_id] = client_queue(connection_id)
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else:
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local_client_id[client_id].re_enable(connection_id)
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return local_client_id[client_id].insert(connection_id)
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logging.warn(self.name + ': no inactive client')
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return False
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else:
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return local_client_id[client_id].insert(connection_id)
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def remove(self, user_id, client_id):
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if user_id in self.user_id:
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local_client_id = self.user_id[user_id]
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if client_id in local_client_id:
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local_client_id[client_id].delref()
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class auth_chain_a(auth_base):
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def __init__(self, method):
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super(auth_chain_a, self).__init__(method)
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self.hashfunc = hashlib.md5
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self.recv_buf = b''
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self.unit_len = 2800
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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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self.max_time_dif = 60 * 60 * 24 # time dif (second) setting
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self.salt = b"auth_chain_a"
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self.no_compatible_method = 'auth_chain_a'
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self.pack_id = 1
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self.recv_id = 1
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self.user_id = None
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self.user_id_num = 0
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self.user_key = None
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self.overhead = 4
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self.client_over_head = 4
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self.last_client_hash = b''
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self.last_server_hash = b''
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self.random_client = xorshift128plus()
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self.random_server = xorshift128plus()
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self.encryptor = None
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def init_data(self):
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return obfs_auth_chain_data(self.method)
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def get_overhead(self, direction): # direction: true for c->s false for s->c
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return self.overhead
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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.split('#')[0])
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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 trapezoid_random_float(self, d):
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if d == 0:
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return random.random()
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s = random.random()
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a = 1 - d
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return (math.sqrt(a * a + 4 * d * s) - a) / (2 * d)
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def trapezoid_random_int(self, max_val, d):
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v = self.trapezoid_random_float(d)
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return int(v * max_val)
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def rnd_data_len(self, buf_size, last_hash, random):
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if buf_size > 1440:
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return 0
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random.init_from_bin_len(last_hash, buf_size)
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if buf_size > 1300:
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return random.next() % 31
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if buf_size > 900:
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return random.next() % 127
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if buf_size > 400:
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return random.next() % 521
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return random.next() % 1021
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def rnd_start_pos(self, rand_len, random):
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if rand_len > 0:
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return random.next() % 8589934609 % rand_len
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return 0
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def rnd_data(self, buf_size, buf, last_hash, random):
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rand_len = self.rnd_data_len(buf_size, last_hash, random)
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rnd_data_buf = os.urandom(rand_len)
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if buf_size == 0:
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return rnd_data_buf
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else:
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if rand_len > 0:
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start_pos = self.rnd_start_pos(rand_len, random)
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return rnd_data_buf[:start_pos] + buf + rnd_data_buf[start_pos:]
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else:
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return buf
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def pack_client_data(self, buf):
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data = self.rnd_data(len(buf), buf, self.last_client_hash, self.random_client)
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data_len = len(data) + 8
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mac_key = self.user_key + struct.pack('<I', self.pack_id)
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length = len(buf) ^ struct.unpack('<H', self.last_client_hash[14:])[0]
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data = struct.pack('<H', length) + data
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self.last_client_hash = hmac.new(mac_key, data, self.hashfunc).digest()
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data += self.last_client_hash[:2]
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self.pack_id = (self.pack_id + 1) & 0xFFFFFFFF
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return data
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def pack_server_data(self, buf):
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buf = self.encryptor.encrypt(buf)
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data = self.rnd_data(len(buf), buf, self.last_server_hash, self.random_server)
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data_len = len(data) + 8
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mac_key = self.user_key + struct.pack('<I', self.pack_id)
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length = len(buf) ^ struct.unpack('<H', self.last_server_hash[14:])[0]
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data = struct.pack('<H', length) + data
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self.last_server_hash = hmac.new(mac_key, data, self.hashfunc).digest()
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data += self.last_server_hash[:2]
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self.pack_id = (self.pack_id + 1) & 0xFFFFFFFF
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return data
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def pack_auth_data(self, auth_data, buf):
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if len(buf) == 0:
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return b''
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if len(buf) > 400:
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rnd_len = struct.unpack('<H', os.urandom(2))[0] % 512
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else:
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rnd_len = struct.unpack('<H', os.urandom(2))[0] % 1024
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data = auth_data
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data_len = 7 + 4 + 16 + 4 + len(buf) + rnd_len + 4
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data = data + struct.pack('<H', data_len) + struct.pack('<H', rnd_len)
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mac_key = self.server_info.iv + self.server_info.key
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uid = os.urandom(4)
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if b':' in to_bytes(self.server_info.protocol_param):
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try:
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items = to_bytes(self.server_info.protocol_param).split(b':')
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self.user_key = self.hashfunc(items[1]).digest()
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uid = struct.pack('<I', int(items[0]))
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except:
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pass
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if self.user_key is None:
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self.user_key = self.server_info.key
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encryptor = encrypt.Encryptor(to_bytes(base64.b64encode(self.user_key)) + self.salt, 'aes-128-cbc', b'\x00' * 16)
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data = uid + encryptor.encrypt(data)[16:]
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data += hmac.new(mac_key, data, self.hashfunc).digest()[:4]
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check_head = os.urandom(1)
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check_head += hmac.new(mac_key, check_head, self.hashfunc).digest()[:6]
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data = check_head + data + os.urandom(rnd_len) + buf
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data += hmac.new(self.user_key, data, self.hashfunc).digest()[:4]
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return data
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def auth_data(self):
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utc_time = int(time.time()) & 0xFFFFFFFF
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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(4)
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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('<I', os.urandom(4))[0] & 0xFFFFFF
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self.server_info.data.connection_id += 1
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return b''.join([struct.pack('<I', utc_time),
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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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ogn_data_len = len(buf)
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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_client_data(buf[:self.unit_len])
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buf = buf[self.unit_len:]
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ret += self.pack_client_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) > 4:
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mac_key = self.user_key + struct.pack('<I', self.recv_id)
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mac = hmac.new(mac_key, self.recv_buf[:2], self.hashfunc).digest()[:2]
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if mac != self.recv_buf[2:4]:
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raise Exception('client_post_decrypt data uncorrect mac')
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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 hmac.new(mac_key, self.recv_buf[:length - 4], self.hashfunc).digest()[:4] != 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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self.recv_id = (self.recv_id + 1) & 0xFFFFFFFF
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pos = common.ord(self.recv_buf[4])
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if pos < 255:
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pos += 4
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else:
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pos = struct.unpack('<H', self.recv_buf[5:7])[0] + 4
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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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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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if self.pack_id == 1:
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tcp_mss = self.server_info.tcp_mss if self.server_info.tcp_mss < 1500 else 1500
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self.server_info.tcp_mss = tcp_mss
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buf = struct.pack('<H', tcp_mss) + buf
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self.unit_len = tcp_mss - self.client_over_head
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while len(buf) > self.unit_len:
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ret += self.pack_server_data(buf[:self.unit_len])
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buf = buf[self.unit_len:]
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ret += self.pack_server_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, False)
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self.recv_buf += buf
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out_buf = b''
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sendback = False
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if not self.has_recv_header:
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if len(self.recv_buf) >= 12 or len(self.recv_buf) in [7, 8]:
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recv_len = min(len(self.recv_buf), 12)
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mac_key = self.server_info.recv_iv + self.server_info.key
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md5data = hmac.new(mac_key, self.recv_buf[:4], self.hashfunc).digest()
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if md5data[:recv_len - 4] != self.recv_buf[4:recv_len]:
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return self.not_match_return(self.recv_buf)
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if len(self.recv_buf) < 12 + 24:
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return (b'', False)
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self.last_client_hash = md5data
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md5data = hmac.new(mac_key, self.recv_buf[12 : 12 + 20], self.hashfunc).digest()
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if md5data[:4] != self.recv_buf[32:36]:
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logging.error('%s data uncorrect auth HMAC-SHA1 from %s:%d, data %s' % (self.no_compatible_method, self.server_info.client, self.server_info.client_port, binascii.hexlify(self.recv_buf)))
|
|
if len(self.recv_buf) < 36:
|
|
return (b'', False)
|
|
return self.not_match_return(self.recv_buf)
|
|
|
|
self.last_server_hash = md5data
|
|
uid = struct.unpack('<I', self.recv_buf[12:16])[0] ^ struct.unpack('<I', md5data[8:12])[0]
|
|
self.user_id_num = uid
|
|
uid = struct.pack('<I', uid)
|
|
if uid in self.server_info.users:
|
|
self.user_id = uid
|
|
self.user_key = self.hashfunc(self.server_info.users[uid]).digest()
|
|
self.server_info.update_user_func(uid)
|
|
else:
|
|
self.user_id_num = 0
|
|
if not self.server_info.users:
|
|
self.user_key = self.server_info.key
|
|
else:
|
|
self.user_key = self.server_info.recv_iv
|
|
encryptor = encrypt.Encryptor(to_bytes(base64.b64encode(self.user_key)) + self.salt, 'aes-128-cbc')
|
|
head = encryptor.decrypt(b'\x00' * 16 + self.recv_buf[16:32] + b'\x00') # need an extra byte or recv empty
|
|
self.client_over_head = struct.unpack('<H', head[12:14])[0]
|
|
|
|
utc_time = struct.unpack('<I', head[:4])[0]
|
|
client_id = struct.unpack('<I', head[4:8])[0]
|
|
connection_id = struct.unpack('<I', head[8:12])[0]
|
|
time_dif = common.int32(utc_time - (int(time.time()) & 0xffffffff))
|
|
if time_dif < -self.max_time_dif or time_dif > self.max_time_dif:
|
|
logging.info('%s: wrong timestamp, time_dif %d, data %s' % (self.no_compatible_method, time_dif, binascii.hexlify(head)))
|
|
return self.not_match_return(self.recv_buf)
|
|
elif self.server_info.data.insert(self.user_id, client_id, connection_id):
|
|
self.has_recv_header = True
|
|
self.client_id = client_id
|
|
self.connection_id = connection_id
|
|
else:
|
|
logging.info('%s: auth fail, data %s' % (self.no_compatible_method, binascii.hexlify(out_buf)))
|
|
return self.not_match_return(self.recv_buf)
|
|
|
|
self.encryptor = encrypt.Encryptor(to_bytes(base64.b64encode(self.user_key)) + to_bytes(base64.b64encode(self.last_server_hash)), 'rc4')
|
|
self.recv_buf = self.recv_buf[36:]
|
|
self.has_recv_header = True
|
|
sendback = True
|
|
|
|
while len(self.recv_buf) > 4:
|
|
mac_key = self.user_key + struct.pack('<I', self.recv_id)
|
|
data_len = struct.unpack('<H', self.recv_buf[:2])[0] ^ struct.unpack('<H', self.last_client_hash[14:16])[0]
|
|
rand_len = self.rnd_data_len(data_len, self.last_client_hash, self.random_client)
|
|
length = data_len + rand_len
|
|
if length >= 4096:
|
|
self.raw_trans = True
|
|
self.recv_buf = b''
|
|
if self.recv_id == 0:
|
|
logging.info(self.no_compatible_method + ': over size')
|
|
return (b'E'*2048, False)
|
|
else:
|
|
raise Exception('server_post_decrype data error')
|
|
|
|
if length + 4 > len(self.recv_buf):
|
|
break
|
|
|
|
client_hash = hmac.new(mac_key, self.recv_buf[:length + 2], self.hashfunc).digest()
|
|
if client_hash[:2] != self.recv_buf[length + 2 : length + 4]:
|
|
logging.info('%s: checksum error, data %s' % (self.no_compatible_method, binascii.hexlify(self.recv_buf[:length])))
|
|
self.raw_trans = True
|
|
self.recv_buf = b''
|
|
if self.recv_id == 0:
|
|
return (b'E'*2048, False)
|
|
else:
|
|
raise Exception('server_post_decrype data uncorrect checksum')
|
|
|
|
self.recv_id = (self.recv_id + 1) & 0xFFFFFFFF
|
|
pos = 2
|
|
if data_len > 0 and rand_len > 0:
|
|
pos = 2 + self.rnd_start_pos(rand_len, self.random_client)
|
|
out_buf += self.encryptor.decrypt(self.recv_buf[pos : data_len + pos])
|
|
self.last_client_hash = client_hash
|
|
self.recv_buf = self.recv_buf[length + 4:]
|
|
if data_len == 0:
|
|
sendback = True
|
|
|
|
if out_buf:
|
|
self.server_info.data.update(self.user_id, self.client_id, self.connection_id)
|
|
return (out_buf, sendback)
|
|
|
|
def client_udp_pre_encrypt(self, buf):
|
|
if self.user_key is None:
|
|
if b':' in to_bytes(self.server_info.protocol_param):
|
|
try:
|
|
items = to_bytes(self.server_info.protocol_param).split(':')
|
|
self.user_key = self.hashfunc(items[1]).digest()
|
|
self.user_id = struct.pack('<I', int(items[0]))
|
|
except:
|
|
pass
|
|
if self.user_key is None:
|
|
self.user_id = os.urandom(4)
|
|
self.user_key = self.server_info.key
|
|
buf += self.user_id
|
|
return buf + hmac.new(self.user_key, buf, self.hashfunc).digest()[:4]
|
|
|
|
def client_udp_post_decrypt(self, buf):
|
|
user_key = self.server_info.key
|
|
if hmac.new(user_key, buf[:-4], self.hashfunc).digest()[:4] != buf[-4:]:
|
|
return b''
|
|
return buf[:-4]
|
|
|
|
def server_udp_pre_encrypt(self, buf):
|
|
user_key = self.server_info.key
|
|
return buf + hmac.new(user_key, buf, self.hashfunc).digest()[:4]
|
|
|
|
def server_udp_post_decrypt(self, buf):
|
|
uid = buf[-8:-4]
|
|
if uid in self.server_info.users:
|
|
user_key = self.hashfunc(self.server_info.users[uid]).digest()
|
|
else:
|
|
uid = None
|
|
if not self.server_info.users:
|
|
user_key = self.server_info.key
|
|
else:
|
|
user_key = self.server_info.recv_iv
|
|
if hmac.new(user_key, buf[:-4], self.hashfunc).digest()[:4] != buf[-4:]:
|
|
return (b'', None)
|
|
return (buf[:-8], uid)
|
|
|
|
def dispose(self):
|
|
self.server_info.data.remove(self.user_id, self.client_id)
|
|
|
|
|