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522 lines
18 KiB
522 lines
18 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 struct
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import zlib
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import shadowsocks
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from shadowsocks import common
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from shadowsocks.obfsplugin import plain
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from shadowsocks.common import to_bytes, to_str, ord
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def create_verify_obfs(method):
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return verify_simple(method)
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def create_verify_deflate(method):
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return verify_deflate(method)
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def create_auth_obfs(method):
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return auth_simple(method)
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obfs_map = {
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'verify_simple': (create_verify_obfs,),
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'verify_deflate': (create_verify_deflate,),
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'auth_simple': (create_auth_obfs,),
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}
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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 obfs_verify_data(object):
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def __init__(self):
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pass
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class verify_base(plain.plain):
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def __init__(self, method):
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super(verify_base, self).__init__(method)
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self.method = method
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def init_data(self):
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return obfs_verify_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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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 get_head_size(self, buf, def_value):
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if len(buf) < 2:
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return def_value
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if ord(buf[0]) == 1:
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return 7
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if ord(buf[0]) == 4:
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return 19
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if ord(buf[0]) == 3:
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return 4 + ord(buf[1])
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return def_value
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class verify_simple(verify_base):
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def __init__(self, method):
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super(verify_simple, 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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def pack_data(self, buf):
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if len(buf) == 0:
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return b''
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rnd_data = os.urandom(common.ord(os.urandom(1)[0]) % 16)
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data = common.chr(len(rnd_data) + 1) + rnd_data + buf
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data = struct.pack('>H', len(data) + 6) + data
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crc = (0xffffffff - binascii.crc32(data)) & 0xffffffff
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data += struct.pack('<I', crc)
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return data
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def client_pre_encrypt(self, 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 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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if self.decrypt_packet_num == 0:
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return None
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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 (binascii.crc32(self.recv_buf[:length]) & 0xffffffff) != 0xffffffff:
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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 None
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else:
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raise Exception('server_post_decrype data uncorrect CRC32')
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pos = common.ord(self.recv_buf[2]) + 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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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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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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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 (binascii.crc32(self.recv_buf[:length]) & 0xffffffff) != 0xffffffff:
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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 CRC32')
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pos = common.ord(self.recv_buf[2]) + 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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class verify_deflate(verify_base):
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def __init__(self, method):
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super(verify_deflate, self).__init__(method)
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self.recv_buf = b''
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self.unit_len = 32700
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self.decrypt_packet_num = 0
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self.raw_trans = False
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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 = zlib.compress(buf)
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data = struct.pack('>H', len(data)) + data[2:]
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return data
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def client_pre_encrypt(self, 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 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 >= 32768 or length < 6:
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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 None
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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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out_buf += zlib.decompress(b'x\x9c' + self.recv_buf[2:length])
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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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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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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 >= 32768 or length < 6:
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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 None
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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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out_buf += zlib.decompress(b'\x78\x9c' + self.recv_buf[2:length])
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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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class client_queue(object):
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def __init__(self, begin_id):
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self.front = begin_id
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self.back = begin_id
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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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def update(self):
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self.last_update = time.time()
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def is_active(self):
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return time.time() - self.last_update < 60 * 3
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def re_enable(self, connection_id):
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self.enable = True
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self.alloc = {}
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self.front = connection_id
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self.back = connection_id
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def insert(self, connection_id):
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self.update()
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if not self.enable:
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logging.warn('auth_simple: not enable')
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return False
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if connection_id < self.front:
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logging.warn('auth_simple: duplicate id')
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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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if connection_id > self.front + 0x4000:
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logging.warn('auth_simple: wrong id')
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return False
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if connection_id in self.alloc:
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logging.warn('auth_simple: duplicate id 2')
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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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return True
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class obfs_auth_data(object):
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def __init__(self):
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self.client_id = {}
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self.startup_time = int(time.time() - 30) & 0xFFFFFFFF
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self.local_client_id = b''
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self.connection_id = 0
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self.max_client = 16 # max active client count
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self.max_buffer = max(self.max_client, 256) # max client id buffer size
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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 insert(self, client_id, connection_id):
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if client_id not in self.client_id or not self.client_id[client_id].enable:
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active = 0
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for c_id in self.client_id:
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if self.client_id[c_id].is_active():
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active += 1
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if active >= self.max_client:
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logging.warn('auth_simple: max active clients exceeded')
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return False
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if len(self.client_id) < self.max_client:
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if client_id not in self.client_id:
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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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keys = self.client_id.keys()
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random.shuffle(keys)
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for c_id in keys:
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if not self.client_id[c_id].is_active() and self.client_id[c_id].enable:
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if len(self.client_id) >= self.max_buffer:
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del self.client_id[c_id]
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else:
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self.client_id[c_id].enable = False
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if client_id not in self.client_id:
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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_simple: no inactive client [assert]')
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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_simple(verify_base):
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def __init__(self, method):
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super(auth_simple, 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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self.max_time_dif = 60 * 5 # time dif (second) setting
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def init_data(self):
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return obfs_auth_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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rnd_data = os.urandom(common.ord(os.urandom(1)[0]) % 16)
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data = common.chr(len(rnd_data) + 1) + rnd_data + buf
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data = struct.pack('>H', len(data) + 6) + data
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crc = (0xffffffff - binascii.crc32(data)) & 0xffffffff
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data += struct.pack('<I', crc)
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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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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_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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if self.decrypt_packet_num == 0:
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return None
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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 (binascii.crc32(self.recv_buf[:length]) & 0xffffffff) != 0xffffffff:
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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 None
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else:
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raise Exception('server_post_decrype data uncorrect CRC32')
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pos = common.ord(self.recv_buf[2]) + 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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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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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_simple: 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 (binascii.crc32(self.recv_buf[:length]) & 0xffffffff) != 0xffffffff:
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logging.info('auth_simple: crc32 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 CRC32')
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pos = common.ord(self.recv_buf[2]) + 2
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out_buf += self.recv_buf[pos:length - 4]
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if not self.has_recv_header:
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if len(out_buf) < 12:
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self.raw_trans = True
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self.recv_buf = b''
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logging.info('auth_simple: too short')
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return b'E'
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utc_time = struct.unpack('<I', out_buf[:4])[0]
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client_id = struct.unpack('<I', out_buf[4:8])[0]
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connection_id = struct.unpack('<I', out_buf[8:12])[0]
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time_dif = common.int32((int(time.time()) & 0xffffffff) - utc_time)
|
|
if time_dif < -self.max_time_dif or time_dif > self.max_time_dif \
|
|
or common.int32(utc_time - self.server_info.data.startup_time) < 0:
|
|
self.raw_trans = True
|
|
self.recv_buf = b''
|
|
logging.info('auth_simple: wrong timestamp, time_dif %d, data %s' % (time_dif, binascii.hexlify(out_buf),))
|
|
return b'E'
|
|
elif self.server_info.data.insert(client_id, connection_id):
|
|
self.has_recv_header = True
|
|
out_buf = out_buf[12:]
|
|
self.client_id = client_id
|
|
self.connection_id = connection_id
|
|
else:
|
|
self.raw_trans = True
|
|
self.recv_buf = b''
|
|
logging.info('auth_simple: auth fail, data %s' % (binascii.hexlify(out_buf),))
|
|
return b'E'
|
|
self.recv_buf = self.recv_buf[length:]
|
|
|
|
if out_buf:
|
|
self.server_info.data.update(self.client_id, self.connection_id)
|
|
self.decrypt_packet_num += 1
|
|
return out_buf
|
|
|
|
|