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299 lines
12 KiB
299 lines
12 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 struct
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import base64
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import datetime
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import random
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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, chr
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def create_http_simple_obfs(method):
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return http_simple(method)
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def create_http_post_obfs(method):
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return http_post(method)
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def create_random_head_obfs(method):
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return random_head(method)
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obfs_map = {
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'http_simple': (create_http_simple_obfs,),
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'http_simple_compatible': (create_http_simple_obfs,),
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'http_post': (create_http_post_obfs,),
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'http_post_compatible': (create_http_post_obfs,),
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'random_head': (create_random_head_obfs,),
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'random_head_compatible': (create_random_head_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 http_simple(plain.plain):
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def __init__(self, method):
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self.method = method
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self.has_sent_header = False
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self.has_recv_header = False
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self.host = None
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self.port = 0
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self.recv_buffer = b''
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self.user_agent = [b"Mozilla/5.0 (Windows NT 6.3; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0",
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b"Mozilla/5.0 (Windows NT 6.3; WOW64; rv:40.0) Gecko/20100101 Firefox/44.0",
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b"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36",
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b"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.11 (KHTML, like Gecko) Ubuntu/11.10 Chromium/27.0.1453.93 Chrome/27.0.1453.93 Safari/537.36",
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b"Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0",
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b"Mozilla/5.0 (compatible; WOW64; MSIE 10.0; Windows NT 6.2)",
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b"Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.20.25 (KHTML, like Gecko) Version/5.0.4 Safari/533.20.27",
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b"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.3; Trident/7.0; .NET4.0E; .NET4.0C)",
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b"Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko",
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b"Mozilla/5.0 (Linux; Android 4.4; Nexus 5 Build/BuildID) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/537.36",
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b"Mozilla/5.0 (iPad; CPU OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3",
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b"Mozilla/5.0 (iPhone; CPU iPhone OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3"]
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def encode_head(self, buf):
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hexstr = binascii.hexlify(buf)
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chs = []
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for i in range(0, len(hexstr), 2):
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chs.append(b"%" + hexstr[i:i+2])
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return b''.join(chs)
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def client_encode(self, buf):
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if self.has_sent_header:
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return buf
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head_size = len(self.server_info.iv) + self.server_info.head_len
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if len(buf) - head_size > 64:
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headlen = head_size + random.randint(0, 64)
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else:
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headlen = len(buf)
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headdata = buf[:headlen]
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buf = buf[headlen:]
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port = b''
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if self.server_info.port != 80:
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port = b':' + to_bytes(str(self.server_info.port))
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http_head = b"GET /" + self.encode_head(headdata) + b" HTTP/1.1\r\n"
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http_head += b"Host: " + to_bytes(self.server_info.obfs_param or self.server_info.host) + port + b"\r\n"
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http_head += b"User-Agent: " + random.choice(self.user_agent) + b"\r\n"
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http_head += b"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\nAccept-Language: en-US,en;q=0.8\r\nAccept-Encoding: gzip, deflate\r\nDNT: 1\r\nConnection: keep-alive\r\n\r\n"
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self.has_sent_header = True
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return http_head + buf
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def client_decode(self, buf):
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if self.has_recv_header:
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return (buf, False)
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pos = buf.find(b'\r\n\r\n')
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if pos >= 0:
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self.has_recv_header = True
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return (buf[pos + 4:], False)
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else:
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return (b'', False)
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def server_encode(self, buf):
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if self.has_sent_header:
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return buf
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header = b'HTTP/1.1 200 OK\r\nConnection: keep-alive\r\nContent-Encoding: gzip\r\nContent-Type: text/html\r\nDate: '
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header += to_bytes(datetime.datetime.now().strftime('%a, %d %b %Y %H:%M:%S GMT'))
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header += b'\r\nServer: nginx\r\nVary: Accept-Encoding\r\n\r\n'
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self.has_sent_header = True
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return header + buf
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def get_data_from_http_header(self, buf):
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ret_buf = b''
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lines = buf.split(b'\r\n')
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if lines and len(lines) > 4:
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hex_items = lines[0].split(b'%')
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if hex_items and len(hex_items) > 1:
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for index in range(1, len(hex_items)):
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if len(hex_items[index]) < 2:
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ret_buf += binascii.unhexlify('0' + hex_items[index])
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break
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elif len(hex_items[index]) > 2:
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ret_buf += binascii.unhexlify(hex_items[index][:2])
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break
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else:
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ret_buf += binascii.unhexlify(hex_items[index])
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return ret_buf
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return b''
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def not_match_return(self, buf):
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self.has_sent_header = True
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self.has_recv_header = True
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if self.method == 'http_simple':
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return (b'E'*64, False, False)
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return (buf, True, False)
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def server_decode(self, buf):
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if self.has_recv_header:
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return (buf, True, False)
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self.recv_buffer += buf
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buf = self.recv_buffer
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if len(buf) > 10:
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if match_begin(buf, b'GET /') or match_begin(buf, b'POST /'):
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if len(buf) > 65536:
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self.recv_buffer = None
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logging.warn('http_simple: over size')
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return self.not_match_return(buf)
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else: #not http header, run on original protocol
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self.recv_buffer = None
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logging.debug('http_simple: not match begin')
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return self.not_match_return(buf)
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else:
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return (b'', True, False)
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if b'\r\n\r\n' in buf:
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datas = buf.split(b'\r\n\r\n', 1)
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ret_buf = self.get_data_from_http_header(buf)
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if len(datas) > 1:
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ret_buf += datas[1]
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if len(ret_buf) >= 7:
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self.has_recv_header = True
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return (ret_buf, True, False)
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return self.not_match_return(buf)
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else:
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return (b'', True, False)
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class http_post(http_simple):
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def __init__(self, method):
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super(http_post, self).__init__(method)
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def boundary(self):
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return b''.join([random.choice(b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789") for i in range(32)])
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def client_encode(self, buf):
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if self.has_sent_header:
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return buf
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head_size = len(self.server_info.iv) + self.server_info.head_len
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if len(buf) - head_size > 64:
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headlen = head_size + random.randint(0, 64)
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else:
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headlen = len(buf)
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headdata = buf[:headlen]
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buf = buf[headlen:]
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port = b''
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if self.server_info.port != 80:
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port = b':' + to_bytes(str(self.server_info.port))
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http_head = b"POST /" + self.encode_head(headdata) + b" HTTP/1.1\r\n"
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http_head += b"Host: " + to_bytes(self.server_info.obfs_param or self.server_info.host) + port + b"\r\n"
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http_head += b"User-Agent: " + random.choice(self.user_agent) + b"\r\n"
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http_head += b"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\nAccept-Language: en-US,en;q=0.8\r\nAccept-Encoding: gzip, deflate\r\n"
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http_head += b"Content-Type: multipart/form-data; boundary=" + self.boundary() + b"\r\nDNT: 1\r\n"
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http_head += "Connection: keep-alive\r\n\r\n"
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self.has_sent_header = True
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return http_head + buf
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def not_match_return(self, buf):
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self.has_sent_header = True
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self.has_recv_header = True
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if self.method == 'http_post':
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return (b'E'*64, False, False)
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return (buf, True, False)
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def server_decode(self, buf):
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if self.has_recv_header:
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return (buf, True, False)
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self.recv_buffer += buf
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buf = self.recv_buffer
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if len(buf) > 10:
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if match_begin(buf, b'GET ') or match_begin(buf, b'POST '):
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if len(buf) > 65536:
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self.recv_buffer = None
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logging.warn('http_post: over size')
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return self.not_match_return(buf)
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else: #not http header, run on original protocol
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self.recv_buffer = None
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logging.debug('http_post: not match begin')
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return self.not_match_return(buf)
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else:
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return (b'', True, False)
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if b'\r\n\r\n' in buf:
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datas = buf.split(b'\r\n\r\n', 1)
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ret_buf = self.get_data_from_http_header(buf)
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if len(datas) > 1:
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ret_buf += datas[1]
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if len(ret_buf) >= 7:
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self.has_recv_header = True
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return (ret_buf, True, False)
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return self.not_match_return(buf)
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else:
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return (b'', True, False)
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class random_head(plain.plain):
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def __init__(self, method):
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self.method = method
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self.has_sent_header = False
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self.has_recv_header = False
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self.raw_trans_sent = False
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self.raw_trans_recv = False
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self.send_buffer = b''
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def client_encode(self, buf):
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if self.raw_trans_sent:
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return buf
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self.send_buffer += buf
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if not self.has_sent_header:
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self.has_sent_header = True
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data = os.urandom(common.ord(os.urandom(1)[0]) % 96 + 4)
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crc = (0xffffffff - binascii.crc32(data)) & 0xffffffff
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return data + struct.pack('<I', crc)
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if self.raw_trans_recv:
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ret = self.send_buffer
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self.send_buffer = b''
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self.raw_trans_sent = True
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return ret
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return b''
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def client_decode(self, buf):
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if self.raw_trans_recv:
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return (buf, False)
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self.raw_trans_recv = True
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return (b'', True)
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def server_encode(self, buf):
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if self.has_sent_header:
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return buf
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self.has_sent_header = True
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return os.urandom(common.ord(os.urandom(1)[0]) % 96 + 4)
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def server_decode(self, buf):
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if self.has_recv_header:
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return (buf, True, False)
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self.has_recv_header = True
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crc = binascii.crc32(buf) & 0xffffffff
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if crc != 0xffffffff:
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self.has_sent_header = True
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if self.method == 'random_head':
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return (b'E'*64, False, False)
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return (buf, True, False)
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# (buffer_to_recv, is_need_decrypt, is_need_to_encode_and_send_back)
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return (b'', False, True)
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