#!/usr/bin/env python # # Copyright 2015-2015 breakwa11 # # Licensed under the Apache License, Version 2.0 (the "License"); you may # not use this file except in compliance with the License. You may obtain # a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the # License for the specific language governing permissions and limitations # under the License. from __future__ import absolute_import, division, print_function, \ with_statement import os import sys import hashlib import logging import binascii import struct import base64 import datetime import random from shadowsocks import common from shadowsocks.obfsplugin import plain from shadowsocks.common import to_bytes, to_str, ord, chr def create_http_simple_obfs(method): return http_simple(method) def create_http_post_obfs(method): return http_post(method) def create_random_head_obfs(method): return random_head(method) obfs_map = { 'http_simple': (create_http_simple_obfs,), 'http_simple_compatible': (create_http_simple_obfs,), 'http_post': (create_http_post_obfs,), 'http_post_compatible': (create_http_post_obfs,), 'random_head': (create_random_head_obfs,), 'random_head_compatible': (create_random_head_obfs,), } def match_begin(str1, str2): if len(str1) >= len(str2): if str1[:len(str2)] == str2: return True return False class http_simple(plain.plain): def __init__(self, method): self.method = method self.has_sent_header = False self.has_recv_header = False self.host = None self.port = 0 self.recv_buffer = b'' self.user_agent = [b"Mozilla/5.0 (Windows NT 6.3; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0", b"Mozilla/5.0 (Windows NT 6.3; WOW64; rv:40.0) Gecko/20100101 Firefox/44.0", b"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36", 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", b"Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0", b"Mozilla/5.0 (compatible; WOW64; MSIE 10.0; Windows NT 6.2)", 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", b"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.3; Trident/7.0; .NET4.0E; .NET4.0C)", b"Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko", 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", 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", 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"] def encode_head(self, buf): hexstr = binascii.hexlify(buf) chs = [] for i in range(0, len(hexstr), 2): chs.append(b"%" + hexstr[i:i+2]) return b''.join(chs) def client_encode(self, buf): if self.has_sent_header: return buf head_size = len(self.server_info.iv) + self.server_info.head_len if len(buf) - head_size > 64: headlen = head_size + random.randint(0, 64) else: headlen = len(buf) headdata = buf[:headlen] buf = buf[headlen:] port = b'' if self.server_info.port != 80: port = b':' + to_bytes(str(self.server_info.port)) http_head = b"GET /" + self.encode_head(headdata) + b" HTTP/1.1\r\n" http_head += b"Host: " + to_bytes(self.server_info.obfs_param or self.server_info.host) + port + b"\r\n" http_head += b"User-Agent: " + random.choice(self.user_agent) + b"\r\n" 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" self.has_sent_header = True return http_head + buf def client_decode(self, buf): if self.has_recv_header: return (buf, False) pos = buf.find(b'\r\n\r\n') if pos >= 0: self.has_recv_header = True return (buf[pos + 4:], False) else: return (b'', False) def server_encode(self, buf): if self.has_sent_header: return buf header = b'HTTP/1.1 200 OK\r\nConnection: keep-alive\r\nContent-Encoding: gzip\r\nContent-Type: text/html\r\nDate: ' header += to_bytes(datetime.datetime.now().strftime('%a, %d %b %Y %H:%M:%S GMT')) header += b'\r\nServer: nginx\r\nVary: Accept-Encoding\r\n\r\n' self.has_sent_header = True return header + buf def get_data_from_http_header(self, buf): ret_buf = b'' lines = buf.split(b'\r\n') if lines and len(lines) > 4: hex_items = lines[0].split(b'%') if hex_items and len(hex_items) > 1: for index in range(1, len(hex_items)): if len(hex_items[index]) < 2: ret_buf += binascii.unhexlify('0' + hex_items[index]) break elif len(hex_items[index]) > 2: ret_buf += binascii.unhexlify(hex_items[index][:2]) break else: ret_buf += binascii.unhexlify(hex_items[index]) return ret_buf return b'' def not_match_return(self, buf): self.has_sent_header = True self.has_recv_header = True if self.method == 'http_simple': return (b'E'*64, False, False) return (buf, True, False) def server_decode(self, buf): if self.has_recv_header: return (buf, True, False) self.recv_buffer += buf buf = self.recv_buffer if len(buf) > 10: if match_begin(buf, b'GET /') or match_begin(buf, b'POST /'): if len(buf) > 65536: self.recv_buffer = None logging.warn('http_simple: over size') return self.not_match_return(buf) else: #not http header, run on original protocol self.recv_buffer = None logging.debug('http_simple: not match begin') return self.not_match_return(buf) else: return (b'', True, False) if b'\r\n\r\n' in buf: datas = buf.split(b'\r\n\r\n', 1) ret_buf = self.get_data_from_http_header(buf) if len(datas) > 1: ret_buf += datas[1] if len(ret_buf) >= 7: self.has_recv_header = True return (ret_buf, True, False) return self.not_match_return(buf) else: return (b'', True, False) class http_post(http_simple): def __init__(self, method): super(http_post, self).__init__(method) def boundary(self): return b''.join([random.choice(b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789") for i in range(32)]) def client_encode(self, buf): if self.has_sent_header: return buf head_size = len(self.server_info.iv) + self.server_info.head_len if len(buf) - head_size > 64: headlen = head_size + random.randint(0, 64) else: headlen = len(buf) headdata = buf[:headlen] buf = buf[headlen:] port = b'' if self.server_info.port != 80: port = b':' + to_bytes(str(self.server_info.port)) http_head = b"POST /" + self.encode_head(headdata) + b" HTTP/1.1\r\n" http_head += b"Host: " + to_bytes(self.server_info.obfs_param or self.server_info.host) + port + b"\r\n" http_head += b"User-Agent: " + random.choice(self.user_agent) + b"\r\n" 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" http_head += b"Content-Type: multipart/form-data; boundary=" + self.boundary() + b"\r\nDNT: 1\r\n" http_head += "Connection: keep-alive\r\n\r\n" self.has_sent_header = True return http_head + buf def not_match_return(self, buf): self.has_sent_header = True self.has_recv_header = True if self.method == 'http_post': return (b'E'*64, False, False) return (buf, True, False) def server_decode(self, buf): if self.has_recv_header: return (buf, True, False) self.recv_buffer += buf buf = self.recv_buffer if len(buf) > 10: if match_begin(buf, b'GET ') or match_begin(buf, b'POST '): if len(buf) > 65536: self.recv_buffer = None logging.warn('http_post: over size') return self.not_match_return(buf) else: #not http header, run on original protocol self.recv_buffer = None logging.debug('http_post: not match begin') return self.not_match_return(buf) else: return (b'', True, False) if b'\r\n\r\n' in buf: datas = buf.split(b'\r\n\r\n', 1) ret_buf = self.get_data_from_http_header(buf) if len(datas) > 1: ret_buf += datas[1] if len(ret_buf) >= 7: self.has_recv_header = True return (ret_buf, True, False) return self.not_match_return(buf) else: return (b'', True, False) class random_head(plain.plain): def __init__(self, method): self.method = method self.has_sent_header = False self.has_recv_header = False self.raw_trans_sent = False self.raw_trans_recv = False self.send_buffer = b'' def client_encode(self, buf): if self.raw_trans_sent: return buf self.send_buffer += buf if not self.has_sent_header: self.has_sent_header = True data = os.urandom(common.ord(os.urandom(1)[0]) % 96 + 4) crc = (0xffffffff - binascii.crc32(data)) & 0xffffffff return data + struct.pack('