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shadowsocksr
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remove auth_sha1, auth_sha1_v2, verify_simple, auth_simple, verify_sha1 

remove TCP over UDP
add UDP part of auth_chain_a
dev
破娃酱 8 years ago
parent
db6629a130
commit
774134ffad
8 changed files with 87 additions and 1505 deletions
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  1. 4
      db_transfer.py
  2. 7
      shadowsocks/obfs.py
  3. 450
      shadowsocks/obfsplugin/auth.py
  4. 84
      shadowsocks/obfsplugin/auth_chain.py
  5. 2
      shadowsocks/obfsplugin/plain.py
  6. 206
      shadowsocks/obfsplugin/verify.py
  7. 2
      shadowsocks/tcprelay.py
  8. 837
      shadowsocks/udprelay.py

4
db_transfer.py
View File

@ -6,7 +6,7 @@ import time
import sys import sys
from server_pool import ServerPool from server_pool import ServerPool
import traceback import traceback
from shadowsocks import common, shell, lru_cache from shadowsocks import common, shell, lru_cache, obfs
from configloader import load_config, get_config from configloader import load_config, get_config
import importloader import importloader
@ -123,7 +123,7 @@ class TransferBase(object):
if allow: if allow:
allow_users[port] = passwd allow_users[port] = passwd
if 'protocol' in cfg and 'protocol_param' in cfg and common.to_str(cfg['protocol']) in ['auth_aes128_md5', 'auth_aes128_sha1']: if 'protocol' in cfg and 'protocol_param' in cfg and common.to_str(cfg['protocol']) in obfs.mu_protocol():
if '#' in common.to_str(cfg['protocol_param']): if '#' in common.to_str(cfg['protocol_param']):
mu_servers[port] = passwd mu_servers[port] = passwd
del allow_users[port] del allow_users[port]

7
shadowsocks/obfs.py
View File

@ -34,6 +34,9 @@ method_supported.update(verify.obfs_map)
method_supported.update(auth.obfs_map) method_supported.update(auth.obfs_map)
method_supported.update(auth_chain.obfs_map) method_supported.update(auth_chain.obfs_map)
def mu_protocol():
return ["auth_aes128_md5", "auth_aes128_sha1", "auth_chain_a"]
class server_info(object): class server_info(object):
def __init__(self, data): def __init__(self, data):
self.data = data self.data = data
@ -99,8 +102,8 @@ class obfs(object):
def client_udp_post_decrypt(self, buf): def client_udp_post_decrypt(self, buf):
return self.obfs.client_udp_post_decrypt(buf) return self.obfs.client_udp_post_decrypt(buf)
def server_udp_pre_encrypt(self, buf): def server_udp_pre_encrypt(self, buf, uid):
return self.obfs.server_udp_pre_encrypt(buf) return self.obfs.server_udp_pre_encrypt(buf, uid)
def server_udp_post_decrypt(self, buf): def server_udp_post_decrypt(self, buf):
return self.obfs.server_udp_post_decrypt(buf) return self.obfs.server_udp_post_decrypt(buf)

450
shadowsocks/obfsplugin/auth.py
View File

@ -37,12 +37,6 @@ from shadowsocks import common, lru_cache, encrypt
from shadowsocks.obfsplugin import plain from shadowsocks.obfsplugin import plain
from shadowsocks.common import to_bytes, to_str, ord, chr from shadowsocks.common import to_bytes, to_str, ord, chr
def create_auth_sha1(method):
return auth_sha1(method)
def create_auth_sha1_v2(method):
return auth_sha1_v2(method)
def create_auth_sha1_v4(method): def create_auth_sha1_v4(method):
return auth_sha1_v4(method) return auth_sha1_v4(method)
@ -53,10 +47,6 @@ def create_auth_aes128_sha1(method):
return auth_aes128_sha1(method, hashlib.sha1) return auth_aes128_sha1(method, hashlib.sha1)
obfs_map = { obfs_map = {
'auth_sha1': (create_auth_sha1,),
'auth_sha1_compatible': (create_auth_sha1,),
'auth_sha1_v2': (create_auth_sha1_v2,),
'auth_sha1_v2_compatible': (create_auth_sha1_v2,),
'auth_sha1_v4': (create_auth_sha1_v4,), 'auth_sha1_v4': (create_auth_sha1_v4,),
'auth_sha1_v4_compatible': (create_auth_sha1_v4,), 'auth_sha1_v4_compatible': (create_auth_sha1_v4,),
'auth_aes128_md5': (create_auth_aes128_md5,), 'auth_aes128_md5': (create_auth_aes128_md5,),
@ -69,10 +59,6 @@ def match_begin(str1, str2):
return True return True
return False return False
class obfs_verify_data(object):
def __init__(self):
pass
class auth_base(plain.plain): class auth_base(plain.plain):
def __init__(self, method): def __init__(self, method):
super(auth_base, self).__init__(method) super(auth_base, self).__init__(method)
@ -153,239 +139,6 @@ class client_queue(object):
self.front += 1 self.front += 1
return True return True
class obfs_auth_data(object):
def __init__(self):
self.client_id = {}
self.startup_time = int(time.time() - 30) & 0xFFFFFFFF
self.local_client_id = b''
self.connection_id = 0
self.set_max_client(64) # max active client count
def update(self, client_id, connection_id):
if client_id in self.client_id:
self.client_id[client_id].update()
def set_max_client(self, max_client):
self.max_client = max_client
self.max_buffer = max(self.max_client * 2, 256)
def insert(self, client_id, connection_id):
if client_id not in self.client_id or not self.client_id[client_id].enable:
active = 0
for c_id in self.client_id:
if self.client_id[c_id].is_active():
active += 1
if active >= self.max_client:
logging.warn('obfs auth: max active clients exceeded')
return False
if len(self.client_id) < self.max_client:
if client_id not in self.client_id:
self.client_id[client_id] = client_queue(connection_id)
else:
self.client_id[client_id].re_enable(connection_id)
return self.client_id[client_id].insert(connection_id)
keys = self.client_id.keys()
random.shuffle(keys)
for c_id in keys:
if not self.client_id[c_id].is_active() and self.client_id[c_id].enable:
if len(self.client_id) >= self.max_buffer:
del self.client_id[c_id]
else:
self.client_id[c_id].enable = False
if client_id not in self.client_id:
self.client_id[client_id] = client_queue(connection_id)
else:
self.client_id[client_id].re_enable(connection_id)
return self.client_id[client_id].insert(connection_id)
logging.warn('obfs auth: no inactive client [assert]')
return False
else:
return self.client_id[client_id].insert(connection_id)
class auth_sha1(auth_base):
def __init__(self, method):
super(auth_sha1, self).__init__(method)
self.recv_buf = b''
self.unit_len = 8000
self.decrypt_packet_num = 0
self.raw_trans = False
self.has_sent_header = False
self.has_recv_header = False
self.client_id = 0
self.connection_id = 0
self.max_time_dif = 60 * 60 # time dif (second) setting
self.no_compatible_method = 'auth_sha1'
def init_data(self):
return obfs_auth_data()
def set_server_info(self, server_info):
self.server_info = server_info
try:
max_client = int(server_info.protocol_param)
except:
max_client = 64
self.server_info.data.set_max_client(max_client)
def pack_data(self, buf):
rnd_data = os.urandom(common.ord(os.urandom(1)[0]) % 16)
data = common.chr(len(rnd_data) + 1) + rnd_data + buf
data = struct.pack('>H', len(data) + 6) + data
adler32 = zlib.adler32(data) & 0xFFFFFFFF
data += struct.pack('<I', adler32)
return data
def pack_auth_data(self, buf):
if len(buf) == 0:
return b''
rnd_data = os.urandom(common.ord(os.urandom(1)[0]) % 128)
data = common.chr(len(rnd_data) + 1) + rnd_data + buf
data = struct.pack('>H', len(data) + 16) + data
crc = binascii.crc32(self.server_info.key) & 0xFFFFFFFF
data = struct.pack('<I', crc) + data
data += hmac.new(self.server_info.iv + self.server_info.key, data, hashlib.sha1).digest()[:10]
return data
def auth_data(self):
utc_time = int(time.time()) & 0xFFFFFFFF
if self.server_info.data.connection_id > 0xFF000000:
self.server_info.data.local_client_id = b''
if not self.server_info.data.local_client_id:
self.server_info.data.local_client_id = os.urandom(4)
logging.debug("local_client_id %s" % (binascii.hexlify(self.server_info.data.local_client_id),))
self.server_info.data.connection_id = struct.unpack('<I', os.urandom(4))[0] & 0xFFFFFF
self.server_info.data.connection_id += 1
return b''.join([struct.pack('<I', utc_time),
self.server_info.data.local_client_id,
struct.pack('<I', self.server_info.data.connection_id)])
def client_pre_encrypt(self, buf):
ret = b''
if not self.has_sent_header:
head_size = self.get_head_size(buf, 30)
datalen = min(len(buf), random.randint(0, 31) + head_size)
ret += self.pack_auth_data(self.auth_data() + buf[:datalen])
buf = buf[datalen:]
self.has_sent_header = True
while len(buf) > self.unit_len:
ret += self.pack_data(buf[:self.unit_len])
buf = buf[self.unit_len:]
ret += self.pack_data(buf)
return ret
def client_post_decrypt(self, buf):
if self.raw_trans:
return buf
self.recv_buf += buf
out_buf = b''
while len(self.recv_buf) > 2:
length = struct.unpack('>H', self.recv_buf[:2])[0]
if length >= 8192 or length < 7:
self.raw_trans = True
self.recv_buf = b''
raise Exception('client_post_decrypt data error')
if length > len(self.recv_buf):
break
if struct.pack('<I', zlib.adler32(self.recv_buf[:length - 4]) & 0xFFFFFFFF) != self.recv_buf[length - 4:length]:
self.raw_trans = True
self.recv_buf = b''
raise Exception('client_post_decrypt data uncorrect checksum')
pos = common.ord(self.recv_buf[2]) + 2
out_buf += self.recv_buf[pos:length - 4]
self.recv_buf = self.recv_buf[length:]
if out_buf:
self.decrypt_packet_num += 1
return out_buf
def server_pre_encrypt(self, buf):
if self.raw_trans:
return buf
ret = b''
while len(buf) > self.unit_len:
ret += self.pack_data(buf[:self.unit_len])
buf = buf[self.unit_len:]
ret += self.pack_data(buf)
return ret
def server_post_decrypt(self, buf):
if self.raw_trans:
return (buf, False)
self.recv_buf += buf
out_buf = b''
if not self.has_recv_header:
if len(self.recv_buf) < 6:
return (b'', False)
crc = struct.pack('<I', binascii.crc32(self.server_info.key) & 0xFFFFFFFF)
if crc != self.recv_buf[:4]:
return self.not_match_return(self.recv_buf)
length = struct.unpack('>H', self.recv_buf[4:6])[0]
if length > 2048:
return self.not_match_return(self.recv_buf)
if length > len(self.recv_buf):
return (b'', False)
sha1data = hmac.new(self.server_info.recv_iv + self.server_info.key, self.recv_buf[:length - 10], hashlib.sha1).digest()[:10]
if sha1data != self.recv_buf[length - 10:length]:
logging.error('auth_sha1 data uncorrect auth HMAC-SHA1')
return self.not_match_return(self.recv_buf)
pos = common.ord(self.recv_buf[6]) + 6
out_buf = self.recv_buf[pos:length - 10]
if len(out_buf) < 12:
logging.info('auth_sha1: too short, data %s' % (binascii.hexlify(self.recv_buf),))
return self.not_match_return(self.recv_buf)
utc_time = struct.unpack('<I', out_buf[:4])[0]
client_id = struct.unpack('<I', out_buf[4:8])[0]
connection_id = struct.unpack('<I', out_buf[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 \
or common.int32(utc_time - self.server_info.data.startup_time) < -self.max_time_dif / 2:
logging.info('auth_sha1: wrong timestamp, time_dif %d, data %s' % (time_dif, binascii.hexlify(out_buf),))
return self.not_match_return(self.recv_buf)
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:
logging.info('auth_sha1: auth fail, data %s' % (binascii.hexlify(out_buf),))
return self.not_match_return(self.recv_buf)
self.recv_buf = self.recv_buf[length:]
self.has_recv_header = True
while len(self.recv_buf) > 2:
length = struct.unpack('>H', self.recv_buf[:2])[0]
if length >= 8192 or length < 7:
self.raw_trans = True
self.recv_buf = b''
if self.decrypt_packet_num == 0:
logging.info('auth_sha1: over size')
return (b'E'*2048, False)
else:
raise Exception('server_post_decrype data error')
if length > len(self.recv_buf):
break
if struct.pack('<I', zlib.adler32(self.recv_buf[:length - 4]) & 0xFFFFFFFF) != self.recv_buf[length - 4:length]:
logging.info('auth_sha1: checksum error, data %s' % (binascii.hexlify(self.recv_buf[:length]),))
self.raw_trans = True
self.recv_buf = b''
if self.decrypt_packet_num == 0:
return (b'E'*2048, False)
else:
raise Exception('server_post_decrype data uncorrect checksum')
pos = common.ord(self.recv_buf[2]) + 2
out_buf += self.recv_buf[pos:length - 4]
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, False)
class obfs_auth_v2_data(object): class obfs_auth_v2_data(object):
def __init__(self): def __init__(self):
self.client_id = lru_cache.LRUCache() self.client_id = lru_cache.LRUCache()
@ -425,207 +178,6 @@ class obfs_auth_v2_data(object):
else: else:
return self.client_id[client_id].insert(connection_id) return self.client_id[client_id].insert(connection_id)
class auth_sha1_v2(auth_base):
def __init__(self, method):
super(auth_sha1_v2, self).__init__(method)
self.recv_buf = b''
self.unit_len = 8100
self.decrypt_packet_num = 0
self.raw_trans = False
self.has_sent_header = False
self.has_recv_header = False
self.client_id = 0
self.connection_id = 0
self.salt = b"auth_sha1_v2"
self.no_compatible_method = 'auth_sha1_v2'
def init_data(self):
return obfs_auth_v2_data()
def set_server_info(self, server_info):
self.server_info = server_info
try:
max_client = int(server_info.protocol_param)
except:
max_client = 64
self.server_info.data.set_max_client(max_client)
def rnd_data(self, buf_size):
if buf_size > 1300:
return b'\x01'
if buf_size > 400:
rnd_data = os.urandom(common.ord(os.urandom(1)[0]) % 128)
return common.chr(len(rnd_data) + 1) + rnd_data
rnd_data = os.urandom(struct.unpack('>H', os.urandom(2))[0] % 1024)
return common.chr(255) + struct.pack('>H', len(rnd_data) + 3) + rnd_data
def pack_data(self, buf):
data = self.rnd_data(len(buf)) + buf
data = struct.pack('>H', len(data) + 6) + data
adler32 = zlib.adler32(data) & 0xFFFFFFFF
data += struct.pack('<I', adler32)
return data
def pack_auth_data(self, buf):
if len(buf) == 0:
return b''
data = self.rnd_data(len(buf)) + buf
data = struct.pack('>H', len(data) + 16) + data
crc = binascii.crc32(self.salt + self.server_info.key) & 0xFFFFFFFF
data = struct.pack('<I', crc) + data
data += hmac.new(self.server_info.iv + self.server_info.key, data, hashlib.sha1).digest()[:10]
return data
def auth_data(self):
if self.server_info.data.connection_id > 0xFF000000:
self.server_info.data.local_client_id = b''
if not self.server_info.data.local_client_id:
self.server_info.data.local_client_id = os.urandom(8)
logging.debug("local_client_id %s" % (binascii.hexlify(self.server_info.data.local_client_id),))
self.server_info.data.connection_id = struct.unpack('<Q', self.server_info.data.local_client_id)[0] % 0xFFFFFD
self.server_info.data.connection_id += 1
return b''.join([self.server_info.data.local_client_id,
struct.pack('<I', self.server_info.data.connection_id)])
def client_pre_encrypt(self, buf):
ret = b''
if not self.has_sent_header:
head_size = self.get_head_size(buf, 30)
datalen = min(len(buf), random.randint(0, 31) + head_size)
ret += self.pack_auth_data(self.auth_data() + buf[:datalen])
buf = buf[datalen:]
self.has_sent_header = True
while len(buf) > self.unit_len:
ret += self.pack_data(buf[:self.unit_len])
buf = buf[self.unit_len:]
ret += self.pack_data(buf)
return ret
def client_post_decrypt(self, buf):
if self.raw_trans:
return buf
self.recv_buf += buf
out_buf = b''
while len(self.recv_buf) > 2:
length = struct.unpack('>H', self.recv_buf[:2])[0]
if length >= 8192 or length < 7:
self.raw_trans = True
self.recv_buf = b''
raise Exception('client_post_decrypt data error')
if length > len(self.recv_buf):
break
if struct.pack('<I', zlib.adler32(self.recv_buf[:length - 4]) & 0xFFFFFFFF) != self.recv_buf[length - 4:length]:
self.raw_trans = True
self.recv_buf = b''
raise Exception('client_post_decrypt data uncorrect checksum')
pos = common.ord(self.recv_buf[2])
if pos < 255:
pos += 2
else:
pos = struct.unpack('>H', self.recv_buf[3:5])[0] + 2
out_buf += self.recv_buf[pos:length - 4]
self.recv_buf = self.recv_buf[length:]
if out_buf:
self.decrypt_packet_num += 1
return out_buf
def server_pre_encrypt(self, buf):
if self.raw_trans:
return buf
ret = b''
while len(buf) > self.unit_len:
ret += self.pack_data(buf[:self.unit_len])
buf = buf[self.unit_len:]
ret += self.pack_data(buf)
return ret
def server_post_decrypt(self, buf):
if self.raw_trans:
return (buf, False)
self.recv_buf += buf
out_buf = b''
sendback = False
if not self.has_recv_header:
if len(self.recv_buf) < 6:
return (b'', False)
crc = struct.pack('<I', binascii.crc32(self.salt + self.server_info.key) & 0xFFFFFFFF)
if crc != self.recv_buf[:4]:
return self.not_match_return(self.recv_buf)
length = struct.unpack('>H', self.recv_buf[4:6])[0]
if length > 2048:
return self.not_match_return(self.recv_buf)
if length > len(self.recv_buf):
return (b'', False)
sha1data = hmac.new(self.server_info.recv_iv + self.server_info.key, self.recv_buf[:length - 10], hashlib.sha1).digest()[:10]
if sha1data != self.recv_buf[length - 10:length]:
logging.error('auth_sha1_v2 data uncorrect auth HMAC-SHA1')
return self.not_match_return(self.recv_buf)
pos = common.ord(self.recv_buf[6])
if pos < 255:
pos += 6
else:
pos = struct.unpack('>H', self.recv_buf[7:9])[0] + 6
out_buf = self.recv_buf[pos:length - 10]
if len(out_buf) < 12:
logging.info('auth_sha1_v2: too short, data %s' % (binascii.hexlify(self.recv_buf),))
return self.not_match_return(self.recv_buf)
client_id = struct.unpack('<Q', out_buf[:8])[0]
connection_id = struct.unpack('<I', out_buf[8:12])[0]
if 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:
logging.info('auth_sha1_v2: auth fail, data %s' % (binascii.hexlify(out_buf),))
return self.not_match_return(self.recv_buf)
self.recv_buf = self.recv_buf[length:]
self.has_recv_header = True
sendback = True
while len(self.recv_buf) > 2:
length = struct.unpack('>H', self.recv_buf[:2])[0]
if length >= 8192 or length < 7:
self.raw_trans = True
self.recv_buf = b''
if self.decrypt_packet_num == 0:
logging.info('auth_sha1_v2: over size')
return (b'E'*2048, False)
else:
raise Exception('server_post_decrype data error')
if length > len(self.recv_buf):
break
if struct.pack('<I', zlib.adler32(self.recv_buf[:length - 4]) & 0xFFFFFFFF) != self.recv_buf[length - 4:length]:
logging.info('auth_sha1_v2: checksum error, data %s' % (binascii.hexlify(self.recv_buf[:length]),))
self.raw_trans = True
self.recv_buf = b''
if self.decrypt_packet_num == 0:
return (b'E'*2048, False)
else:
raise Exception('server_post_decrype data uncorrect checksum')
pos = common.ord(self.recv_buf[2])
if pos < 255:
pos += 2
else:
pos = struct.unpack('>H', self.recv_buf[3:5])[0] + 2
out_buf += self.recv_buf[pos:length - 4]
self.recv_buf = self.recv_buf[length:]
if pos == length - 4:
sendback = True
if out_buf:
self.server_info.data.update(self.client_id, self.connection_id)
self.decrypt_packet_num += 1
return (out_buf, sendback)
class auth_sha1_v4(auth_base): class auth_sha1_v4(auth_base):
def __init__(self, method): def __init__(self, method):
super(auth_sha1_v4, self).__init__(method) super(auth_sha1_v4, self).__init__(method)
@ -1215,7 +767,7 @@ class auth_aes128_sha1(auth_base):
return b'' return b''
return buf[:-4] return buf[:-4]
def server_udp_pre_encrypt(self, buf): def server_udp_pre_encrypt(self, buf, uid):
user_key = self.server_info.key user_key = self.server_info.key
return buf + hmac.new(user_key, buf, self.hashfunc).digest()[:4] return buf + hmac.new(user_key, buf, self.hashfunc).digest()[:4]

84
shadowsocks/obfsplugin/auth_chain.py
View File

@ -289,6 +289,10 @@ class auth_chain_a(auth_base):
return random.next() % 521 return random.next() % 521
return random.next() % 1021 return random.next() % 1021
def udp_rnd_data_len(self, last_hash, random):
random.init_from_bin(last_hash)
return random.next() % 127
def rnd_start_pos(self, rand_len, random): def rnd_start_pos(self, rand_len, random):
if rand_len > 0: if rand_len > 0:
return random.next() % 8589934609 % rand_len return random.next() % 8589934609 % rand_len
@ -457,20 +461,12 @@ class auth_chain_a(auth_base):
return (b'', False) return (b'', False)
self.last_client_hash = md5data self.last_client_hash = md5data
md5data = hmac.new(mac_key, self.recv_buf[12 : 12 + 20], self.hashfunc).digest()
if md5data[:4] != self.recv_buf[32:36]:
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] uid = struct.unpack('<I', self.recv_buf[12:16])[0] ^ struct.unpack('<I', md5data[8:12])[0]
self.user_id_num = uid self.user_id_num = uid
uid = struct.pack('<I', uid) uid = struct.pack('<I', uid)
if uid in self.server_info.users: if uid in self.server_info.users:
self.user_id = uid self.user_id = uid
self.user_key = self.hashfunc(self.server_info.users[uid]).digest() self.user_key = self.server_info.users[uid]
self.server_info.update_user_func(uid) self.server_info.update_user_func(uid)
else: else:
self.user_id_num = 0 self.user_id_num = 0
@ -478,6 +474,15 @@ class auth_chain_a(auth_base):
self.user_key = self.server_info.key self.user_key = self.server_info.key
else: else:
self.user_key = self.server_info.recv_iv self.user_key = self.server_info.recv_iv
md5data = hmac.new(self.user_key, self.recv_buf[12 : 12 + 20], self.hashfunc).digest()
if md5data[:4] != self.recv_buf[32:36]:
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
encryptor = encrypt.Encryptor(to_bytes(base64.b64encode(self.user_key)) + self.salt, 'aes-128-cbc') 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 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] self.client_over_head = struct.unpack('<H', head[12:14])[0]
@ -497,7 +502,7 @@ class auth_chain_a(auth_base):
logging.info('%s: auth fail, data %s' % (self.no_compatible_method, binascii.hexlify(out_buf))) logging.info('%s: auth fail, data %s' % (self.no_compatible_method, binascii.hexlify(out_buf)))
return self.not_match_return(self.recv_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.encryptor = encrypt.Encryptor(to_bytes(base64.b64encode(self.user_key)) + to_bytes(base64.b64encode(self.last_client_hash)), 'rc4')
self.recv_buf = self.recv_buf[36:] self.recv_buf = self.recv_buf[36:]
self.has_recv_header = True self.has_recv_header = True
sendback = True sendback = True
@ -555,32 +560,65 @@ class auth_chain_a(auth_base):
if self.user_key is None: if self.user_key is None:
self.user_id = os.urandom(4) self.user_id = os.urandom(4)
self.user_key = self.server_info.key self.user_key = self.server_info.key
buf += self.user_id authdata = os.urandom(3)
return buf + hmac.new(self.user_key, buf, self.hashfunc).digest()[:4] mac_key = self.server_info.key
md5data = hmac.new(mac_key, authdata, self.hashfunc).digest()
uid = struct.unpack('<I', self.user_id)[0] ^ struct.unpack('<I', md5data[:4])[0]
uid = struct.pack('<I', uid)
rand_len = self.udp_rnd_data_len(md5data, self.random_client)
encryptor = encrypt.Encryptor(to_bytes(base64.b64encode(self.user_key)) + to_bytes(base64.b64encode(md5data)), 'rc4')
out_buf = encryptor.encrypt(buf)
buf = out_buf + os.urandom(rand_len) + authdata + uid
return buf + hmac.new(self.user_key, buf, self.hashfunc).digest()[:1]
def client_udp_post_decrypt(self, buf): def client_udp_post_decrypt(self, buf):
user_key = self.server_info.key if len(buf) <= 8:
if hmac.new(user_key, buf[:-4], self.hashfunc).digest()[:4] != buf[-4:]: return (b'', None)
return b'' if hmac.new(self.user_key, buf[:-1], self.hashfunc).digest()[:1] != buf[-1:]:
return buf[:-4] return (b'', None)
mac_key = self.server_info.key
md5data = hmac.new(mac_key, buf[-8:-1], self.hashfunc).digest()
rand_len = self.udp_rnd_data_len(md5data, self.random_server)
encryptor = encrypt.Encryptor(to_bytes(base64.b64encode(self.user_key)) + to_bytes(base64.b64encode(md5data)), 'rc4')
return encryptor.decrypt(buf[:-8 - rand_len])
def server_udp_pre_encrypt(self, buf): def server_udp_pre_encrypt(self, buf, uid):
user_key = self.server_info.key if uid in self.server_info.users:
return buf + hmac.new(user_key, buf, self.hashfunc).digest()[:4] user_key = self.server_info.users[uid]
else:
uid = None
if not self.server_info.users:
user_key = self.server_info.key
else:
user_key = self.server_info.recv_iv
authdata = os.urandom(7)
mac_key = self.server_info.key
md5data = hmac.new(mac_key, authdata, self.hashfunc).digest()
rand_len = self.udp_rnd_data_len(md5data, self.random_server)
encryptor = encrypt.Encryptor(to_bytes(base64.b64encode(self.user_key)) + to_bytes(base64.b64encode(md5data)), 'rc4')
out_buf = encryptor.encrypt(buf)
buf = out_buf + os.urandom(rand_len) + authdata
return buf + hmac.new(user_key, buf, self.hashfunc).digest()[:1]
def server_udp_post_decrypt(self, buf): def server_udp_post_decrypt(self, buf):
uid = buf[-8:-4] mac_key = self.server_info.key
md5data = hmac.new(mac_key, buf[-8:-5], self.hashfunc).digest()
uid = struct.unpack('<I', buf[-5:-1])[0] ^ struct.unpack('<I', md5data[:4])[0]
uid = struct.pack('<I', uid)
if uid in self.server_info.users: if uid in self.server_info.users:
user_key = self.hashfunc(self.server_info.users[uid]).digest() user_key = self.server_info.users[uid]
else: else:
uid = None uid = None
if not self.server_info.users: if not self.server_info.users:
user_key = self.server_info.key user_key = self.server_info.key
else: else:
user_key = self.server_info.recv_iv user_key = self.server_info.recv_iv
if hmac.new(user_key, buf[:-4], self.hashfunc).digest()[:4] != buf[-4:]: if hmac.new(user_key, buf[:-1], self.hashfunc).digest()[:1] != buf[-1:]:
return (b'', None) return (b'', None)
return (buf[:-8], uid) rand_len = self.udp_rnd_data_len(md5data, self.random_client)
encryptor = encrypt.Encryptor(to_bytes(base64.b64encode(user_key)) + to_bytes(base64.b64encode(md5data)), 'rc4')
out_buf = encryptor.decrypt(buf[:-8 - rand_len])
return (out_buf, uid)
def dispose(self): def dispose(self):
self.server_info.data.remove(self.user_id, self.client_id) self.server_info.data.remove(self.user_id, self.client_id)

2
shadowsocks/obfsplugin/plain.py
View File

@ -81,7 +81,7 @@ class plain(object):
def client_udp_post_decrypt(self, buf): def client_udp_post_decrypt(self, buf):
return buf return buf
def server_udp_pre_encrypt(self, buf): def server_udp_pre_encrypt(self, buf, uid):
return buf return buf
def server_udp_post_decrypt(self, buf): def server_udp_post_decrypt(self, buf):

206
shadowsocks/obfsplugin/verify.py
View File

@ -36,23 +36,11 @@ from shadowsocks import common
from shadowsocks.obfsplugin import plain from shadowsocks.obfsplugin import plain
from shadowsocks.common import to_bytes, to_str, ord, chr from shadowsocks.common import to_bytes, to_str, ord, chr
def create_verify_obfs(method):
return verify_simple(method)
def create_verify_deflate(method): def create_verify_deflate(method):
return verify_deflate(method) return verify_deflate(method)
def create_verify_sha1(method):
return verify_sha1(method)
def create_auth_obfs(method):
return auth_simple(method)
obfs_map = { obfs_map = {
'verify_simple': (create_verify_obfs,),
'verify_deflate': (create_verify_deflate,), 'verify_deflate': (create_verify_deflate,),
'verify_sha1': (create_verify_sha1,),
'verify_sha1_compatible': (create_verify_sha1,),
} }
def match_begin(str1, str2): def match_begin(str1, str2):
@ -88,100 +76,6 @@ class verify_base(plain.plain):
def server_decode(self, buf): def server_decode(self, buf):
return (buf, True, False) return (buf, True, False)
class verify_simple(verify_base):
def __init__(self, method):
super(verify_simple, self).__init__(method)
self.recv_buf = b''
self.unit_len = 8100
self.decrypt_packet_num = 0
self.raw_trans = False
def pack_data(self, buf):
if len(buf) == 0:
return b''
rnd_data = os.urandom(common.ord(os.urandom(1)[0]) % 16)
data = common.chr(len(rnd_data) + 1) + rnd_data + buf
data = struct.pack('>H', len(data) + 6) + data
crc = (0xffffffff - binascii.crc32(data)) & 0xffffffff
data += struct.pack('<I', crc)
return data
def client_pre_encrypt(self, buf):
ret = b''
while len(buf) > self.unit_len:
ret += self.pack_data(buf[:self.unit_len])
buf = buf[self.unit_len:]
ret += self.pack_data(buf)
return ret
def client_post_decrypt(self, buf):
if self.raw_trans:
return buf
self.recv_buf += buf
out_buf = b''
while len(self.recv_buf) > 2:
length = struct.unpack('>H', self.recv_buf[:2])[0]
if length >= 8192 or length < 7:
self.raw_trans = True
self.recv_buf = b''
raise Exception('client_post_decrypt data error')
if length > len(self.recv_buf):
break
if (binascii.crc32(self.recv_buf[:length]) & 0xffffffff) != 0xffffffff:
self.raw_trans = True
self.recv_buf = b''
raise Exception('client_post_decrypt data uncorrect CRC32')
pos = common.ord(self.recv_buf[2]) + 2
out_buf += self.recv_buf[pos:length - 4]
self.recv_buf = self.recv_buf[length:]
if out_buf:
self.decrypt_packet_num += 1
return out_buf
def server_pre_encrypt(self, buf):
ret = b''
while len(buf) > self.unit_len:
ret += self.pack_data(buf[:self.unit_len])
buf = buf[self.unit_len:]
ret += self.pack_data(buf)
return ret
def server_post_decrypt(self, buf):
if self.raw_trans:
return (buf, False)
self.recv_buf += buf
out_buf = b''
while len(self.recv_buf) > 2:
length = struct.unpack('>H', self.recv_buf[:2])[0]
if length >= 8192 or length < 7:
self.raw_trans = True
self.recv_buf = b''
if self.decrypt_packet_num == 0:
return (b'E'*2048, False)
else:
raise Exception('server_post_decrype data error')
if length > len(self.recv_buf):
break
if (binascii.crc32(self.recv_buf[:length]) & 0xffffffff) != 0xffffffff:
self.raw_trans = True
self.recv_buf = b''
if self.decrypt_packet_num == 0:
return (b'E'*2048, False)
else:
raise Exception('server_post_decrype data uncorrect CRC32')
pos = common.ord(self.recv_buf[2]) + 2
out_buf += self.recv_buf[pos:length - 4]
self.recv_buf = self.recv_buf[length:]
if out_buf:
self.decrypt_packet_num += 1
return (out_buf, False)
class verify_deflate(verify_base): class verify_deflate(verify_base):
def __init__(self, method): def __init__(self, method):
super(verify_deflate, self).__init__(method) super(verify_deflate, self).__init__(method)
@ -258,103 +152,3 @@ class verify_deflate(verify_base):
self.decrypt_packet_num += 1 self.decrypt_packet_num += 1
return (out_buf, False) return (out_buf, False)
class verify_sha1(verify_base):
def __init__(self, method):
super(verify_sha1, self).__init__(method)
self.recv_buf = b''
self.unit_len = 8100
self.raw_trans = False
self.pack_id = 0
self.recv_id = 0
self.has_sent_header = False
self.has_recv_header = False
def pack_data(self, buf):
if len(buf) == 0:
return b''
sha1data = hmac.new(self.server_info.iv + struct.pack('>I', self.pack_id), buf, hashlib.sha1).digest()
data = struct.pack('>H', len(buf)) + sha1data[:10] + buf
self.pack_id += 1
return data
def pack_auth_data(self, buf):
data = chr(ord(buf[0]) | 0x10) + buf[1:]
data += hmac.new(self.server_info.iv + self.server_info.key, data, hashlib.sha1).digest()[:10]
return data
def client_pre_encrypt(self, buf):
ret = b''
if not self.has_sent_header:
datalen = self.get_head_size(buf, 30)
ret += self.pack_auth_data(buf[:datalen])
buf = buf[datalen:]
self.has_sent_header = True
while len(buf) > self.unit_len:
ret += self.pack_data(buf[:self.unit_len])
buf = buf[self.unit_len:]
ret += self.pack_data(buf)
return ret
def client_post_decrypt(self, buf):
return buf
def server_pre_encrypt(self, buf):
return buf
def not_match_return(self, buf):
self.raw_trans = True
if self.method == 'verify_sha1':
return (b'E'*2048, False)
return (buf, False)
def server_post_decrypt(self, buf):
if self.raw_trans:
return (buf, False)
self.recv_buf += buf
out_buf = b''
if not self.has_recv_header:
if len(self.recv_buf) < 2:
return (b'', False)
if (ord(self.recv_buf[0]) & 0x10) != 0x10:
return self.not_match_return(self.recv_buf)
head_size = self.get_head_size(self.recv_buf, 65536)
if len(self.recv_buf) < head_size + 10:
return self.not_match_return(self.recv_buf)
sha1data = hmac.new(self.server_info.recv_iv + self.server_info.key, self.recv_buf[:head_size], hashlib.sha1).digest()[:10]
if sha1data != self.recv_buf[head_size:head_size + 10]:
logging.error('server_post_decrype data uncorrect auth HMAC-SHA1')
return self.not_match_return(self.recv_buf)
out_buf = to_bytes(chr(ord(self.recv_buf[0]) & 0xEF)) + self.recv_buf[1:head_size]
self.recv_buf = self.recv_buf[head_size + 10:]
self.has_recv_header = True
while len(self.recv_buf) > 2:
length = struct.unpack('>H', self.recv_buf[:2])[0] + 12
if length > len(self.recv_buf):
break
data = self.recv_buf[12:length]
sha1data = hmac.new(self.server_info.recv_iv + struct.pack('>I', self.recv_id), data, hashlib.sha1).digest()[:10]
if sha1data != self.recv_buf[2:12]:
raise Exception('server_post_decrype data uncorrect chunk HMAC-SHA1')
self.recv_id = (self.recv_id + 1) & 0xFFFFFFFF
out_buf += data
self.recv_buf = self.recv_buf[length:]
return (out_buf, False)
def client_udp_pre_encrypt(self, buf):
ret = self.pack_auth_data(buf)
return chr(ord(buf[0]) | 0x10) + buf[1:]
def server_udp_post_decrypt(self, buf):
if buf and ((ord(buf[0]) & 0x10) == 0x10):
if len(buf) <= 11:
return (b'', None)
sha1data = hmac.new(self.server_info.recv_iv + self.server_info.key, buf[:-10], hashlib.sha1).digest()[:10]
if sha1data != buf[-10:]:
return (b'', None)
return (to_bytes(chr(ord(buf[0]) & 0xEF)) + buf[1:-10], None)
else:
return (buf, None)

2
shadowsocks/tcprelay.py
View File

@ -1116,7 +1116,7 @@ class TCPRelay(object):
listen_port = config['server_port'] listen_port = config['server_port']
self._listen_port = listen_port self._listen_port = listen_port
if common.to_bytes(config['protocol']) in [b"auth_aes128_md5", b"auth_aes128_sha1"]: if common.to_str(config['protocol']) in obfs.mu_protocol():
self._update_users(None, None) self._update_users(None, None)
addrs = socket.getaddrinfo(listen_addr, listen_port, 0, addrs = socket.getaddrinfo(listen_addr, listen_port, 0,

837
shadowsocks/udprelay.py
View File

@ -123,751 +123,6 @@ RSP_STATE_ERROR = b"\x03"
RSP_STATE_DISCONNECT = b"\x04" RSP_STATE_DISCONNECT = b"\x04"
RSP_STATE_REDIRECT = b"\x05" RSP_STATE_REDIRECT = b"\x05"
class UDPLocalAddress(object):
def __init__(self, addr):
self.addr = addr
self.last_activity = time.time()
def is_timeout(self):
return time.time() - self.last_activity > 30
class PacketInfo(object):
def __init__(self, data):
self.data = data
self.time = time.time()
class SendingQueue(object):
def __init__(self):
self.queue = {}
self.begin_id = 0
self.end_id = 1
self.interval = 0.5
def append(self, data):
self.queue[self.end_id] = PacketInfo(data)
self.end_id += 1
return self.end_id - 1
def empty(self):
return self.begin_id + 1 == self.end_id
def size(self):
return self.end_id - self.begin_id - 1
def get_begin_id(self):
return self.begin_id
def get_end_id(self):
return self.end_id
def get_data_list(self, pack_id_base, pack_id_list):
ret_list = []
curtime = time.time()
for pack_id in pack_id_list:
offset = pack_id_base + pack_id
if offset <= self.begin_id or self.end_id <= offset:
continue
ret_data = self.queue[offset]
if curtime - ret_data.time > self.interval:
ret_data.time = curtime
ret_list.append( (offset, ret_data.data) )
return ret_list
def set_finish(self, begin_id, done_list):
while self.begin_id < begin_id:
self.begin_id += 1
del self.queue[self.begin_id]
class RecvQueue(object):
def __init__(self):
self.queue = {}
self.miss_queue = set()
self.begin_id = 0
self.end_id = 1
def empty(self):
return self.begin_id + 1 == self.end_id
def insert(self, pack_id, data):
if (pack_id not in self.queue) and pack_id > self.begin_id:
self.queue[pack_id] = PacketInfo(data)
if self.end_id == pack_id:
self.end_id = pack_id + 1
elif self.end_id < pack_id:
eid = self.end_id
while eid < pack_id:
self.miss_queue.add(eid)
eid += 1
self.end_id = pack_id + 1
else:
self.miss_queue.remove(pack_id)
def set_end(self, end_id):
if end_id > self.end_id:
eid = self.end_id
while eid < end_id:
self.miss_queue.add(eid)
eid += 1
self.end_id = end_id
def get_begin_id(self):
return self.begin_id
def has_data(self):
return (self.begin_id + 1) in self.queue
def get_data(self):
if (self.begin_id + 1) in self.queue:
self.begin_id += 1
pack_id = self.begin_id
ret_data = self.queue[pack_id]
del self.queue[pack_id]
return (pack_id, ret_data.data)
def get_missing_id(self, begin_id):
missing = []
if begin_id == 0:
begin_id = self.begin_id
for i in self.miss_queue:
if i - begin_id > 32768:
break
missing.append(i - begin_id)
return (begin_id, missing)
class AddressMap(object):
def __init__(self):
self._queue = []
self._addr_map = {}
def add(self, addr):
if addr in self._addr_map:
self._addr_map[addr] = UDPLocalAddress(addr)
else:
self._addr_map[addr] = UDPLocalAddress(addr)
self._queue.append(addr)
def keys(self):
return self._queue
def get(self):
if self._queue:
while True:
if len(self._queue) == 1:
return self._queue[0]
index = random.randint(0, len(self._queue) - 1)
addr = self._queue[index]
if self._addr_map[addr].is_timeout():
self._queue[index] = self._queue[len(self._queue) - 1]
del self._queue[len(self._queue) - 1]
del self._addr_map[addr]
else:
break
return addr
else:
return None
class TCPRelayHandler(object):
def __init__(self, server, reqid_to_handlers, fd_to_handlers, loop,
local_sock, local_id, client_param, config,
dns_resolver, is_local):
self._server = server
self._reqid_to_handlers = reqid_to_handlers
self._fd_to_handlers = fd_to_handlers
self._loop = loop
self._local_sock = local_sock
self._remote_sock = None
self._remote_udp = False
self._config = config
self._dns_resolver = dns_resolver
self._local_id = local_id
self._is_local = is_local
self._stage = STAGE_INIT
self._password = config['password']
self._method = config['method']
self._fastopen_connected = False
self._data_to_write_to_local = []
self._data_to_write_to_remote = []
self._upstream_status = WAIT_STATUS_READING
self._downstream_status = WAIT_STATUS_INIT
self._request_id = 0
self._client_address = AddressMap()
self._remote_address = None
self._sendingqueue = SendingQueue()
self._recvqueue = RecvQueue()
if 'forbidden_ip' in config:
self._forbidden_iplist = config['forbidden_ip']
else:
self._forbidden_iplist = None
if 'forbidden_port' in config:
self._forbidden_portset = config['forbidden_port']
else:
self._forbidden_portset = None
#fd_to_handlers[local_sock.fileno()] = self
#local_sock.setblocking(False)
#loop.add(local_sock, eventloop.POLL_IN | eventloop.POLL_ERR)
self.last_activity = 0
self._update_activity()
self._random_mtu_size = [random.randint(POST_MTU_MIN, POST_MTU_MAX) for i in range(1024)]
self._random_mtu_index = 0
self._rand_data = b"\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10" * 4
def __hash__(self):
# default __hash__ is id / 16
# we want to eliminate collisions
return id(self)
@property
def remote_address(self):
return self._remote_address
def add_local_address(self, addr):
self._client_address.add(addr)
def get_local_address(self):
return self._client_address.get()
def _update_activity(self):
# tell the TCP Relay we have activities recently
# else it will think we are inactive and timed out
self._server.update_activity(self)
def _update_stream(self, stream, status):
# update a stream to a new waiting status
# check if status is changed
# only update if dirty
dirty = False
if stream == STREAM_DOWN:
if self._downstream_status != status:
self._downstream_status = status
dirty = True
elif stream == STREAM_UP:
if self._upstream_status != status:
self._upstream_status = status
dirty = True
if dirty:
'''
if self._local_sock:
event = eventloop.POLL_ERR
if self._downstream_status & WAIT_STATUS_WRITING:
event |= eventloop.POLL_OUT
if self._upstream_status & WAIT_STATUS_READING:
event |= eventloop.POLL_IN
self._loop.modify(self._local_sock, event)
'''
if self._remote_sock:
event = eventloop.POLL_ERR
if self._downstream_status & WAIT_STATUS_READING:
event |= eventloop.POLL_IN
if self._upstream_status & WAIT_STATUS_WRITING:
event |= eventloop.POLL_OUT
self._loop.modify(self._remote_sock, event)
def _write_to_sock(self, data, sock, addr = None):
# write data to sock
# if only some of the data are written, put remaining in the buffer
# and update the stream to wait for writing
if not data or not sock:
return False
uncomplete = False
retry = 0
if sock == self._local_sock:
data = encrypt.encrypt_all(self._password, self._method, 1, data)
if addr is None:
return False
try:
self._server.write_to_server_socket(data, addr)
except (OSError, IOError) as e:
error_no = eventloop.errno_from_exception(e)
uncomplete = True
if error_no in (errno.EAGAIN, errno.EINPROGRESS,
errno.EWOULDBLOCK):
pass
else:
#traceback.print_exc()
shell.print_exception(e)
self.destroy()
return False
else:
try:
l = len(data)
s = sock.send(data)
if s < l:
data = data[s:]
uncomplete = True
except (OSError, IOError) as e:
error_no = eventloop.errno_from_exception(e)
if error_no in (errno.EAGAIN, errno.EINPROGRESS,
errno.EWOULDBLOCK):
uncomplete = True
else:
#logging.error(traceback.extract_stack())
#traceback.print_exc()
shell.print_exception(e)
self.destroy()
return False
if uncomplete:
if sock == self._local_sock:
self._update_stream(STREAM_DOWN, WAIT_STATUS_WRITING)
elif sock == self._remote_sock:
self._data_to_write_to_remote.append(data)
self._update_stream(STREAM_UP, WAIT_STATUS_WRITING)
else:
logging.error('write_all_to_sock:unknown socket')
else:
if sock == self._local_sock:
if self._sendingqueue.size() > SENDING_WINDOW_SIZE:
self._update_stream(STREAM_DOWN, WAIT_STATUS_WRITING)
else:
self._update_stream(STREAM_DOWN, WAIT_STATUS_READING)
elif sock == self._remote_sock:
self._update_stream(STREAM_UP, WAIT_STATUS_READING)
else:
logging.error('write_all_to_sock:unknown socket')
return True
def _create_remote_socket(self, ip, port):
addrs = socket.getaddrinfo(ip, port, 0, socket.SOCK_STREAM, socket.SOL_TCP)
if len(addrs) == 0:
raise Exception("getaddrinfo failed for %s:%d" % (ip, port))
af, socktype, proto, canonname, sa = addrs[0]
if self._forbidden_iplist:
if common.to_str(sa[0]) in self._forbidden_iplist:
raise Exception('IP %s is in forbidden list, reject' %
common.to_str(sa[0]))
remote_sock = socket.socket(af, socktype, proto)
self._remote_sock = remote_sock
self._fd_to_handlers[remote_sock.fileno()] = self
remote_sock.setblocking(False)
remote_sock.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
return remote_sock
def _handle_dns_resolved(self, result, error):
if error:
self._log_error(error)
self.destroy()
return
if result:
ip = result[1]
if ip:
try:
self._stage = STAGE_CONNECTING
remote_addr = ip
remote_port = self._remote_address[1]
logging.info("connect to %s : %d" % (remote_addr, remote_port))
remote_sock = self._create_remote_socket(remote_addr,
remote_port)
try:
remote_sock.connect((remote_addr, remote_port))
except (OSError, IOError) as e:
if eventloop.errno_from_exception(e) in (errno.EINPROGRESS,
errno.EWOULDBLOCK):
pass # always goto here
else:
raise e
self._loop.add(remote_sock,
eventloop.POLL_ERR | eventloop.POLL_OUT,
self._server)
self._update_stream(STREAM_UP, WAIT_STATUS_READWRITING)
self._update_stream(STREAM_DOWN, WAIT_STATUS_READING)
self._stage = STAGE_STREAM
addr = self.get_local_address()
for i in range(2):
rsp_data = self._pack_rsp_data(CMD_RSP_CONNECT_REMOTE, RSP_STATE_CONNECTEDREMOTE)
self._write_to_sock(rsp_data, self._local_sock, addr)
return
except Exception as e:
shell.print_exception(e)
if self._config['verbose']:
traceback.print_exc()
self.destroy()
def _on_local_read(self):
# handle all local read events and dispatch them to methods for
# each stage
self._update_activity()
if not self._local_sock:
return
data = None
try:
data = self._local_sock.recv(BUF_SIZE)
except (OSError, IOError) as e:
if eventloop.errno_from_exception(e) in \
(errno.ETIMEDOUT, errno.EAGAIN, errno.EWOULDBLOCK):
return
if not data:
self.destroy()
return
if not data:
return
self._server.server_transfer_ul += len(data)
#TODO ============================================================
if self._stage == STAGE_STREAM:
self._write_to_sock(data, self._remote_sock)
return
def _on_remote_read(self):
# handle all remote read events
self._update_activity()
data = None
try:
data = self._remote_sock.recv(BUF_SIZE)
except (OSError, IOError) as e:
if eventloop.errno_from_exception(e) in \
(errno.ETIMEDOUT, errno.EAGAIN, errno.EWOULDBLOCK, 10035): #errno.WSAEWOULDBLOCK
return
if not data:
self.destroy()
return
try:
self._server.server_transfer_dl += len(data)
recv_data = data
beg_pos = 0
max_len = len(recv_data)
while beg_pos < max_len:
if beg_pos + POST_MTU_MAX >= max_len:
split_pos = max_len
else:
split_pos = beg_pos + self._random_mtu_size[self._random_mtu_index]
self._random_mtu_index = (self._random_mtu_index + 1) & 0x3ff
#split_pos = beg_pos + random.randint(POST_MTU_MIN, POST_MTU_MAX)
data = recv_data[beg_pos:split_pos]
beg_pos = split_pos
pack_id = self._sendingqueue.append(data)
post_data = self._pack_post_data(CMD_POST, pack_id, data)
addr = self.get_local_address()
self._write_to_sock(post_data, self._local_sock, addr)
if pack_id <= DOUBLE_SEND_BEG_IDS:
post_data = self._pack_post_data(CMD_POST, pack_id, data)
self._write_to_sock(post_data, self._local_sock, addr)
except Exception as e:
shell.print_exception(e)
if self._config['verbose']:
traceback.print_exc()
# TODO use logging when debug completed
self.destroy()
def _on_local_write(self):
# handle local writable event
if self._data_to_write_to_local:
data = b''.join(self._data_to_write_to_local)
self._data_to_write_to_local = []
self._write_to_sock(data, self._local_sock)
else:
self._update_stream(STREAM_DOWN, WAIT_STATUS_READING)
def _on_remote_write(self):
# handle remote writable event
self._stage = STAGE_STREAM
if self._data_to_write_to_remote:
data = b''.join(self._data_to_write_to_remote)
self._data_to_write_to_remote = []
self._write_to_sock(data, self._remote_sock)
else:
self._update_stream(STREAM_UP, WAIT_STATUS_READING)
def _on_local_error(self):
logging.debug('got local error')
if self._local_sock:
logging.error(eventloop.get_sock_error(self._local_sock))
self.destroy()
def _on_remote_error(self):
logging.debug('got remote error')
if self._remote_sock:
logging.error(eventloop.get_sock_error(self._remote_sock))
self.destroy()
def _pack_rsp_data(self, cmd, data):
reqid_str = struct.pack(">H", self._request_id)
return b''.join([CMD_VER_STR, common.chr(cmd), reqid_str, data, self._rand_data[:random.randint(0, len(self._rand_data))], reqid_str])
def _pack_rnd_data(self, data):
length = random.randint(0, len(self._rand_data))
if length == 0:
return data
elif length == 1:
return b"\x81" + data
elif length < 256:
return b"\x80" + common.chr(length) + self._rand_data[:length - 2] + data
else:
return b"\x82" + struct.pack(">H", length) + self._rand_data[:length - 3] + data
def _pack_post_data(self, cmd, pack_id, data):
reqid_str = struct.pack(">H", self._request_id)
recv_id = self._recvqueue.get_begin_id()
rsp_data = b''.join([CMD_VER_STR, common.chr(cmd), reqid_str, struct.pack(">I", recv_id), struct.pack(">I", pack_id), data, reqid_str])
return rsp_data
def _pack_post_data_64(self, cmd, send_id, pack_id, data):
reqid_str = struct.pack(">H", self._request_id)
recv_id = self._recvqueue.get_begin_id()
rsp_data = b''.join([CMD_VER_STR, common.chr(cmd), reqid_str, struct.pack(">Q", recv_id), struct.pack(">Q", pack_id), data, reqid_str])
return rsp_data
def sweep_timeout(self):
logging.info("sweep_timeout")
if self._stage == STAGE_STREAM:
pack_id, missing = self._recvqueue.get_missing_id(0)
logging.info("sweep_timeout %s %s" % (pack_id, missing))
data = b''
for pid in missing:
data += struct.pack(">H", pid)
rsp_data = self._pack_post_data(CMD_SYN_STATUS, pack_id, data)
addr = self.get_local_address()
self._write_to_sock(rsp_data, self._local_sock, addr)
def handle_stream_sync_status(self, addr, cmd, request_id, pack_id, max_send_id, data):
missing_list = []
while len(data) >= 2:
pid = struct.unpack(">H", data[0:2])[0]
data = data[2:]
missing_list.append(pid)
done_list = []
self._recvqueue.set_end(max_send_id)
self._sendingqueue.set_finish(pack_id, done_list)
if self._stage == STAGE_DESTROYED and self._sendingqueue.empty():
self.destroy_local()
return
# post CMD_SYN_STATUS
send_id = self._sendingqueue.get_end_id()
post_pack_id, missing = self._recvqueue.get_missing_id(0)
pack_ids_data = b''
for pid in missing:
pack_ids_data += struct.pack(">H", pid)
rsp_data = self._pack_rnd_data(self._pack_post_data(CMD_SYN_STATUS, send_id, pack_ids_data))
self._write_to_sock(rsp_data, self._local_sock, addr)
send_list = self._sendingqueue.get_data_list(pack_id, missing_list)
for post_pack_id, post_data in send_list:
rsp_data = self._pack_post_data(CMD_POST, post_pack_id, post_data)
self._write_to_sock(rsp_data, self._local_sock, addr)
if post_pack_id <= DOUBLE_SEND_BEG_IDS:
rsp_data = self._pack_post_data(CMD_POST, post_pack_id, post_data)
self._write_to_sock(rsp_data, self._local_sock, addr)
def handle_client(self, addr, cmd, request_id, data):
self.add_local_address(addr)
if cmd == CMD_DISCONNECT:
rsp_data = self._pack_rsp_data(CMD_DISCONNECT, RSP_STATE_EMPTY)
self._write_to_sock(rsp_data, self._local_sock, addr)
self.destroy()
self.destroy_local()
return
if self._stage == STAGE_INIT:
if cmd == CMD_CONNECT:
self._request_id = request_id
self._stage = STAGE_RSP_ID
return
if self._request_id != request_id:
return
if self._stage == STAGE_RSP_ID:
if cmd == CMD_CONNECT:
for i in range(2):
rsp_data = self._pack_rsp_data(CMD_RSP_CONNECT, RSP_STATE_CONNECTED)
self._write_to_sock(rsp_data, self._local_sock, addr)
elif cmd == CMD_CONNECT_REMOTE:
local_id = data[0:4]
if self._local_id == local_id:
data = data[4:]
header_result = parse_header(data)
if header_result is None:
return
connecttype, remote_addr, remote_port, header_length = header_result
self._remote_address = (common.to_str(remote_addr), remote_port)
self._stage = STAGE_DNS
self._dns_resolver.resolve(remote_addr,
self._handle_dns_resolved)
common.connect_log('TCPonUDP connect %s:%d from %s:%d' % (remote_addr, remote_port, addr[0], addr[1]))
else:
# ileagal request
rsp_data = self._pack_rsp_data(CMD_DISCONNECT, RSP_STATE_EMPTY)
self._write_to_sock(rsp_data, self._local_sock, addr)
elif self._stage == STAGE_CONNECTING:
if cmd == CMD_CONNECT_REMOTE:
local_id = data[0:4]
if self._local_id == local_id:
for i in range(2):
rsp_data = self._pack_rsp_data(CMD_RSP_CONNECT_REMOTE, RSP_STATE_CONNECTEDREMOTE)
self._write_to_sock(rsp_data, self._local_sock, addr)
else:
# ileagal request
rsp_data = self._pack_rsp_data(CMD_DISCONNECT, RSP_STATE_EMPTY)
self._write_to_sock(rsp_data, self._local_sock, addr)
elif self._stage == STAGE_STREAM:
if len(data) < 4:
# ileagal request
rsp_data = self._pack_rsp_data(CMD_DISCONNECT, RSP_STATE_EMPTY)
self._write_to_sock(rsp_data, self._local_sock, addr)
return
local_id = data[0:4]
if self._local_id != local_id:
# ileagal request
rsp_data = self._pack_rsp_data(CMD_DISCONNECT, RSP_STATE_EMPTY)
self._write_to_sock(rsp_data, self._local_sock, addr)
return
else:
data = data[4:]
if cmd == CMD_CONNECT_REMOTE:
rsp_data = self._pack_rsp_data(CMD_RSP_CONNECT_REMOTE, RSP_STATE_CONNECTEDREMOTE)
self._write_to_sock(rsp_data, self._local_sock, addr)
elif cmd == CMD_POST:
recv_id = struct.unpack(">I", data[0:4])[0]
pack_id = struct.unpack(">I", data[4:8])[0]
self._recvqueue.insert(pack_id, data[8:])
self._sendingqueue.set_finish(recv_id, [])
elif cmd == CMD_POST_64:
recv_id = struct.unpack(">Q", data[0:8])[0]
pack_id = struct.unpack(">Q", data[8:16])[0]
self._recvqueue.insert(pack_id, data[16:])
self._sendingqueue.set_finish(recv_id, [])
elif cmd == CMD_DISCONNECT:
rsp_data = self._pack_rsp_data(CMD_DISCONNECT, RSP_STATE_EMPTY)
self._write_to_sock(rsp_data, self._local_sock, addr)
self.destroy()
self.destroy_local()
return
elif cmd == CMD_SYN_STATUS:
pack_id = struct.unpack(">I", data[0:4])[0]
max_send_id = struct.unpack(">I", data[4:8])[0]
data = data[8:]
self.handle_stream_sync_status(addr, cmd, request_id, pack_id, max_send_id, data)
elif cmd == CMD_SYN_STATUS_64:
pack_id = struct.unpack(">Q", data[0:8])[0]
max_send_id = struct.unpack(">Q", data[8:16])[0]
data = data[16:]
self.handle_stream_sync_status(addr, cmd, request_id, pack_id, max_send_id, data)
while self._recvqueue.has_data():
pack_id, post_data = self._recvqueue.get_data()
self._write_to_sock(post_data, self._remote_sock)
elif self._stage == STAGE_DESTROYED:
local_id = data[0:4]
if self._local_id != local_id:
# ileagal request
rsp_data = self._pack_rsp_data(CMD_DISCONNECT, RSP_STATE_EMPTY)
self._write_to_sock(rsp_data, self._local_sock, addr)
return
else:
data = data[4:]
if cmd == CMD_SYN_STATUS:
pack_id = struct.unpack(">I", data[0:4])[0]
max_send_id = struct.unpack(">I", data[4:8])[0]
data = data[8:]
self.handle_stream_sync_status(addr, cmd, request_id, pack_id, max_send_id, data)
elif cmd == CMD_SYN_STATUS_64:
pack_id = struct.unpack(">Q", data[0:8])[0]
max_send_id = struct.unpack(">Q", data[8:16])[0]
data = data[16:]
self.handle_stream_sync_status(addr, cmd, request_id, pack_id, max_send_id, data)
def handle_event(self, sock, event):
# handle all events in this handler and dispatch them to methods
handle = False
if self._stage == STAGE_DESTROYED:
logging.debug('ignore handle_event: destroyed')
return True
# order is important
if sock == self._remote_sock:
if event & eventloop.POLL_ERR:
handle = True
self._on_remote_error()
if self._stage == STAGE_DESTROYED:
return True
if event & (eventloop.POLL_IN | eventloop.POLL_HUP):
handle = True
self._on_remote_read()
if self._stage == STAGE_DESTROYED:
return True
if event & eventloop.POLL_OUT:
handle = True
self._on_remote_write()
elif sock == self._local_sock:
if event & eventloop.POLL_ERR:
handle = True
self._on_local_error()
if self._stage == STAGE_DESTROYED:
return True
if event & (eventloop.POLL_IN | eventloop.POLL_HUP):
handle = True
self._on_local_read()
if self._stage == STAGE_DESTROYED:
return True
if event & eventloop.POLL_OUT:
handle = True
self._on_local_write()
else:
logging.warn('unknown socket')
return handle
def _log_error(self, e):
logging.error('%s when handling connection from %s' %
(e, self._client_address.keys()))
def destroy(self):
# destroy the handler and release any resources
# promises:
# 1. destroy won't make another destroy() call inside
# 2. destroy releases resources so it prevents future call to destroy
# 3. destroy won't raise any exceptions
# if any of the promises are broken, it indicates a bug has been
# introduced! mostly likely memory leaks, etc
#logging.info('tcp destroy called')
if self._stage == STAGE_DESTROYED:
# this couldn't happen
logging.debug('already destroyed')
return
self._stage = STAGE_DESTROYED
if self._remote_address:
logging.debug('destroy: %s:%d' %
self._remote_address)
else:
logging.debug('destroy')
if self._remote_sock:
logging.debug('destroying remote')
self._loop.remove(self._remote_sock)
try:
del self._fd_to_handlers[self._remote_sock.fileno()]
except Exception as e:
pass
self._remote_sock.close()
self._remote_sock = None
if self._sendingqueue.empty():
self.destroy_local()
self._dns_resolver.remove_callback(self._handle_dns_resolved)
def destroy_local(self):
if self._local_sock:
logging.debug('disconnect local')
rsp_data = self._pack_rsp_data(CMD_DISCONNECT, RSP_STATE_EMPTY)
addr = None
addr = self.get_local_address()
self._write_to_sock(rsp_data, self._local_sock, addr)
self._local_sock = None
try:
del self._reqid_to_handlers[self._request_id]
except Exception as e:
pass
self._server.remove_handler(self)
def client_key(source_addr, server_af): def client_key(source_addr, server_af):
# notice this is server af, not dest af # notice this is server af, not dest af
return '%s:%s:%d' % (source_addr[0], source_addr[1], server_af) return '%s:%s:%d' % (source_addr[0], source_addr[1], server_af)
@ -908,7 +163,7 @@ class UDPRelay(object):
self.server_user_transfer_ul = {} self.server_user_transfer_ul = {}
self.server_user_transfer_dl = {} self.server_user_transfer_dl = {}
if common.to_bytes(config['protocol']) in [b"auth_aes128_md5", b"auth_aes128_sha1"]: if common.to_bytes(config['protocol']) in obfs.mu_protocol():
self._update_users(None, None) self._update_users(None, None)
self.protocol_data = obfs.obfs(config['protocol']).init_data() self.protocol_data = obfs.obfs(config['protocol']).init_data()
@ -1261,71 +516,6 @@ class UDPRelay(object):
else: else:
shell.print_exception(e) shell.print_exception(e)
def _handle_tcp_over_udp(self, data, r_addr):
#(cmd, request_id, data)
#logging.info("UDP data %d %d %s" % (data[0], data[1], binascii.hexlify(data[2])))
try:
self.server_transfer_ul += len(data[2])
if data[0] == 0:
if len(data[2]) >= 4:
for i in range(64):
req_id = random.randint(1, 65535)
if req_id not in self._reqid_to_hd:
break
if req_id in self._reqid_to_hd:
for i in range(64):
req_id = random.randint(1, 65535)
if type(self._reqid_to_hd[req_id]) is tuple:
break
# return req id
self._reqid_to_hd[req_id] = (data[2][0:4], None)
rsp_data = self._pack_rsp_data(CMD_RSP_CONNECT, req_id, RSP_STATE_CONNECTED)
data_to_send = encrypt.encrypt_all(self._password, self._method, 1, rsp_data)
self.write_to_server_socket(data_to_send, r_addr)
elif data[0] == CMD_CONNECT_REMOTE:
if len(data[2]) > 4 and data[1] in self._reqid_to_hd:
# create
if type(self._reqid_to_hd[data[1]]) is tuple:
if data[2][0:4] == self._reqid_to_hd[data[1]][0]:
handle = TCPRelayHandler(self, self._reqid_to_hd, self._fd_to_handlers,
self._eventloop, self._server_socket,
self._reqid_to_hd[data[1]][0], self._reqid_to_hd[data[1]][1],
self._config, self._dns_resolver, self._is_local)
self._reqid_to_hd[data[1]] = handle
handle.handle_client(r_addr, CMD_CONNECT, data[1], data[2])
handle.handle_client(r_addr, *data)
self.update_activity(handle)
else:
# disconnect
rsp_data = self._pack_rsp_data(CMD_DISCONNECT, data[1], RSP_STATE_EMPTY)
data_to_send = encrypt.encrypt_all(self._password, self._method, 1, rsp_data)
self.write_to_server_socket(data_to_send, r_addr)
else:
self.update_activity(self._reqid_to_hd[data[1]])
self._reqid_to_hd[data[1]].handle_client(r_addr, *data)
else:
# disconnect
rsp_data = self._pack_rsp_data(CMD_DISCONNECT, data[1], RSP_STATE_EMPTY)
data_to_send = encrypt.encrypt_all(self._password, self._method, 1, rsp_data)
self.write_to_server_socket(data_to_send, r_addr)
elif data[0] > CMD_CONNECT_REMOTE and data[0] <= CMD_DISCONNECT:
if data[1] in self._reqid_to_hd:
if type(self._reqid_to_hd[data[1]]) is tuple:
pass
else:
self.update_activity(self._reqid_to_hd[data[1]])
self._reqid_to_hd[data[1]].handle_client(r_addr, *data)
else:
# disconnect
rsp_data = self._pack_rsp_data(CMD_DISCONNECT, data[1], RSP_STATE_EMPTY)
data_to_send = encrypt.encrypt_all(self._password, self._method, 1, rsp_data)
self.write_to_server_socket(data_to_send, r_addr)
return
except Exception as e:
trace = traceback.format_exc()
logging.error(trace)
return
def _handle_client(self, sock): def _handle_client(self, sock):
data, r_addr = sock.recvfrom(BUF_SIZE) data, r_addr = sock.recvfrom(BUF_SIZE)
if not data: if not data:
@ -1333,6 +523,18 @@ class UDPRelay(object):
return return
if self._stat_callback: if self._stat_callback:
self._stat_callback(self._listen_port, len(data)) self._stat_callback(self._listen_port, len(data))
client_addr = self._client_fd_to_server_addr.get(sock.fileno())
client_uid = None
if client_addr:
key = client_key(client_addr[0], client_addr[1])
client_pair = self._cache.get(key, None)
client_dns_pair = self._cache_dns_client.get(key, None)
if client_pair:
client, client_uid = client_pair
elif client_dns_pair:
client, client_uid = client_dns_pair
if not self._is_local: if not self._is_local:
addrlen = len(r_addr[0]) addrlen = len(r_addr[0])
if addrlen > 255: if addrlen > 255:
@ -1341,7 +543,7 @@ class UDPRelay(object):
data = pack_addr(r_addr[0]) + struct.pack('>H', r_addr[1]) + data data = pack_addr(r_addr[0]) + struct.pack('>H', r_addr[1]) + data
ref_iv = [encrypt.encrypt_new_iv(self._method)] ref_iv = [encrypt.encrypt_new_iv(self._method)]
self._protocol.obfs.server_info.iv = ref_iv[0] self._protocol.obfs.server_info.iv = ref_iv[0]
data = self._protocol.server_udp_pre_encrypt(data) data = self._protocol.server_udp_pre_encrypt(data, client_uid)
response = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key, self._method, 1, response = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key, self._method, 1,
data, ref_iv) data, ref_iv)
if not response: if not response:
@ -1361,16 +563,9 @@ class UDPRelay(object):
#logging.debug('UDP handle_client %s:%d to %s:%d' % (common.to_str(r_addr[0]), r_addr[1], dest_addr, dest_port)) #logging.debug('UDP handle_client %s:%d to %s:%d' % (common.to_str(r_addr[0]), r_addr[1], dest_addr, dest_port))
response = b'\x00\x00\x00' + data response = b'\x00\x00\x00' + data
client_addr = self._client_fd_to_server_addr.get(sock.fileno())
if client_addr: if client_addr:
key = client_key(client_addr[0], client_addr[1]) if client_uid:
client_pair = self._cache.get(key, None)
client_dns_pair = self._cache_dns_client.get(key, None)
if client_pair:
client, client_uid = client_pair
self.add_transfer_d(client_uid, len(response))
elif client_dns_pair:
client, client_uid = client_dns_pair
self.add_transfer_d(client_uid, len(response)) self.add_transfer_d(client_uid, len(response))
else: else:
self.server_transfer_dl += len(response) self.server_transfer_dl += len(response)

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