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257 lines
7.9 KiB
257 lines
7.9 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 datetime
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from shadowsocks.obfsplugin import plain
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from shadowsocks import common
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from shadowsocks.common import to_bytes, to_str, ord
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def create_http_obfs(method):
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return http_simple(method)
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def create_http2_obfs(method):
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return http2_simple(method)
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def create_tls_obfs(method):
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return tls_simple(method)
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def create_random_head_obfs(method):
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return random_head(method)
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obfs = {
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'http_simple': (create_http_obfs,),
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'http2_simple': (create_http2_obfs,),
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'tls_simple': (create_tls_obfs,),
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'random_head': (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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def client_encode(self, buf):
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# TODO
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return buf
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def client_decode(self, buf):
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# TODO
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return (buf, 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\nServer: openresty\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\nContent-Type: text/plain; charset=utf-8\r\nTransfer-Encoding: chunked\r\nConnection: keep-alive\r\nKeep-Alive: timeout=20\r\nVary: Accept-Encoding\r\nContent-Encoding: gzip\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(hex_items[index][:2])
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break
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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 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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buf = self.recv_buffer + buf
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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.has_sent_header = True
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self.has_recv_header = True
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self.recv_buffer = None
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return (buf, True, False)
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else: #not http header, run on original protocol
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self.has_sent_header = True
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self.has_recv_header = True
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self.recv_buffer = None
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return (buf, True, False)
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else:
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self.recv_buffer = buf
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return (b'', True, False)
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datas = buf.split(b'\r\n\r\n', 1)
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if datas and len(datas) > 1:
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ret_buf = self.get_data_from_http_header(buf)
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ret_buf += datas[1]
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if len(ret_buf) >= 15:
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self.has_recv_header = True
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return (ret_buf, True, False)
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self.recv_buffer = buf
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return (b'', True, False)
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else:
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self.recv_buffer = buf
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return (b'', True, False)
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self.has_sent_header = True
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self.has_recv_header = True
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return (buf, True, False)
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class http2_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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def client_encode(self, buf):
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# TODO
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return buf
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def client_decode(self, buf):
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# TODO
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return (buf, 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/1.1 101 Switching Protocols\r\nConnection: Upgrade\r\nUpgrade: h2c\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 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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buf = self.recv_buffer + buf
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if len(buf) > 10:
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if match_begin(buf, b'GET /'):
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pass
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else: #not http header, run on original protocol
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self.has_sent_header = True
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self.has_recv_header = True
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self.recv_buffer = None
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return (buf, True, False)
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else:
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self.recv_buffer = buf
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return (b'', True, False)
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datas = buf.split(b'\r\n\r\n', 1)
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if datas and len(datas) > 1 and len(datas[0]) >= 4:
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lines = buf.split(b'\r\n')
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if lines and len(lines) >= 4:
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if match_begin(lines[4], b'HTTP2-Settings: '):
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ret_buf = base64.urlsafe_b64decode(lines[4][16:])
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ret_buf += datas[1]
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self.has_recv_header = True
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return (ret_buf, True, False)
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self.recv_buffer = buf
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return (b'', True, False)
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else:
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self.recv_buffer = buf
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return (b'', True, False)
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self.has_sent_header = True
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self.has_recv_header = True
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return (buf, True, False)
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class tls_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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def client_encode(self, buf):
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return buf
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def client_decode(self, buf):
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# (buffer_to_recv, is_need_to_encode_and_send_back)
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return (buf, 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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self.has_sent_header = True
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# TODO
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#server_hello = b''
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return b'\x16\x03\x01'
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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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if not match_begin(buf, b'\x16\x03\x01'):
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self.has_sent_header = True
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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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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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def client_encode(self, buf):
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return buf
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def client_decode(self, buf):
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# (buffer_to_recv, is_need_to_encode_and_send_back)
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return (buf, 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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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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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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