def parse_name(data, offset):
p = offset
labels = []
# l为偏置offset的数据
l = common.ord(data[p])
while l > 0:
# 为什么是128+64
if (l & (128 + 64)) == (128 + 64):
# 定义指针
pointer = struct.unpack('!H', data[p:p + 2])[0]
# 指针取无符号2字节
pointer &= 0x3FFF
# 递归自身处理记录
r = parse_name(data, pointer)
# 追加数据
labels.append(r[1])
# 指针偏移自增两个字节
p += 2
# 指针到末尾（递归结束条件）
return p - offset, b'.'.join(labels)
else:
# 追加labels
labels.append(data[p + 1:p + 1 + l])
# 指针自增（递归的一般条件）
p += 1 + l
l = common.ord(data[p])
# 递归结束：l=0:
return p - offset + 1, b'.'.join(labels)
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 parse_name(data, offset):
p = offset
labels = []
# l为data数据流中的偏置offset的label的长度
l = common.ord(data[p])
while l > 0:
# 为什么是128+64, 因为未经压缩的合法name长度在63内，因此
# rfc定义0x11000000B为压缩指针的标志
if (l & (128 + 64)) == (128 + 64):
# 取出指针的位置
pointer = struct.unpack('!H', data[p:p + 2])[0]
# 指针取两个字节减去高两位（用于标志0x11000000B那两位）
pointer &= 0x3FFF
# 递归处理指针，找到上文的name记录，参考rfc1035
r = parse_name(data, pointer)
# 读取指针所指的数据，追加到labels中
labels.append(r[1])
# 指针偏移自增两个字节（跳过0x11000000B所在的两个字节的data数据段）
p += 2
# 递归返回
return p - offset, b'.'.join(labels)
# 若不是指针压缩，直接追加dns报文
else:
# 追加labels
labels.append(data[p + 1:p + 1 + l])
# 指针自增（1+len）
p += 1 + l
l = common.ord(data[p])
# 递归返回
return p - offset + 1, b'.'.join(labels)
def parse_name(data, offset):
"""
提取NAME字段
:param data: 接收到的数据
:param offset: name字段的偏移量
:return: (l, r) l name字段的长度，r 解析出的数据
"""
p = offset
labels = []
l = common.ord(data[p])
while l > 0:
if (l & (128 + 64)) == (128 + 64):
# pointer
pointer = struct.unpack('!H', data[p:p + 2])[0]
pointer &= 0x3FFF
r = parse_name(data, pointer)
labels.append(r[1])
p += 2
# pointer is the end
return p - offset, b'.'.join(labels)
else:
labels.append(data[p + 1:p + 1 + l])
p += 1 + l
l = common.ord(data[p])
return p - offset + 1, b'.'.join(labels)
def get_head_size(self, buf, def_value):
if len(buf) < 2:
return def_value
if ord(buf[0]) == 1:
return 7
if ord(buf[0]) == 4:
return 19
if ord(buf[0]) == 3:
return 4 + ord(buf[1])
return def_value
def server_udp_post_decrypt(self, buf):
if buf and ((ord(buf[0]) & 0x10) == 0x10):
if len(buf) <= 11:
return b''
sha1data = hmac.new(self.server_info.recv_iv + self.server_info.key, buf[:-10], hashlib.sha1).digest()[:10]
if sha1data != buf[-10:]:
return b''
return to_bytes(chr(ord(buf[0]) & 0xEF)) + buf[1:-10]
else:
return buf
def server_udp_post_decrypt(self, buf):
if buf and ((ord(buf[0]) & 0x10) == 0x10):
if len(buf) <= 11:
return b'E'
sha1data = hmac.new(self.server_info.recv_iv + self.server_info.key, buf[:-10], hashlib.sha1).digest()[:10]
if sha1data != buf[-10:]:
logging.error('server_udp_post_decrypt data uncorrect auth HMAC-SHA1')
return b'E'
return to_bytes(chr(ord(buf[0]) & 0xEF)) + buf[1:-10]
else:
return buf
def _get_head_size(self, buf, def_value):
if len(buf) < 2:
return def_value
head_type = common.ord(buf[0]) & 0xF
if head_type == 1:
return 7
if head_type == 4:
return 19
if head_type == 3:
return 4 + common.ord(buf[1])
return def_value
def get_head_size(self, buf, def_value):
if len(buf) < 2:
return def_value
head_type = ord(buf[0]) & 0x7
if head_type == 1:
return 7
if head_type == 4:
return 19
if head_type == 3:
return 4 + ord(buf[1])
return def_value
def test_nonce_increment():
buf = create_string_buffer(12)
print("".join("%02x" % ord(b) for b in buf))
nonce_increment(buf, 12)
nonce_increment(buf, 12)
nonce_increment(buf, 12)
nonce_increment(buf, 12)
print("".join("%02x" % ord(b) for b in buf))
for i in range(256):
nonce_increment(buf, 12)
print("".join("%02x" % ord(b) for b in buf))
def client_decode(self, buf):
if self.handshake_status == -1:
return (buf, False)
if self.handshake_status == 8:
ret = b''
self.recv_buffer += buf
while len(self.recv_buffer) > 5:
if ord(self.recv_buffer[0]) != 0x17:
logging.info("data = %s" % (binascii.hexlify(self.recv_buffer)))
raise Exception('server_decode appdata error')
size = struct.unpack('>H', self.recv_buffer[3:5])[0]
if len(self.recv_buffer) < size + 5:
break
buf = self.recv_buffer[5:size+5]
ret += buf
self.recv_buffer = self.recv_buffer[size+5:]
return (ret, False)
if len(buf) < 11 + 32 + 1 + 32:
raise Exception('client_decode data error')
verify = buf[11:33]
if hmac.new(self.server_info.key + self.server_info.data.client_id, verify, hashlib.sha1).digest()[:10] != buf[33:43]:
raise Exception('client_decode data error')
return (b'', True)
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 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 client_post_decrypt(self, buf):
if self.raw_trans:
return buf
self.recv_buf += buf
out_buf = b''
while len(self.recv_buf) > 4:
mac_key = self.user_key + struct.pack('<I', self.recv_id)
mac = hmac.new(mac_key, self.recv_buf[:2], self.hashfunc).digest()[:2]
if mac != self.recv_buf[2:4]:
raise Exception('client_post_decrypt data uncorrect mac')
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 hmac.new(mac_key, self.recv_buf[:length - 4], self.hashfunc).digest()[:4] != self.recv_buf[length - 4:length]:
self.raw_trans = True
self.recv_buf = b''
raise Exception('client_post_decrypt data uncorrect checksum')
self.recv_id = (self.recv_id + 1) & 0xFFFFFFFF
pos = common.ord(self.recv_buf[4])
if pos < 255:
pos += 4
else:
pos = struct.unpack('<H', self.recv_buf[5:7])[0] + 4
out_buf += self.recv_buf[pos:length - 4]
self.recv_buf = self.recv_buf[length:]
return out_buf
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', 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', 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)
def server_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:
self.raw_trans = True
self.recv_buf = b''
if self.decrypt_packet_num == 0:
logging.info('auth_simple: over size')
return b'E'
else:
raise Exception('server_post_decrype data error')
if length > len(self.recv_buf):
break
if (binascii.crc32(self.recv_buf[:length]) & 0xffffffff) != 0xffffffff:
logging.info('auth_simple: crc32 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'
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]
if not self.has_recv_header:
if len(out_buf) < 12:
self.raw_trans = True
self.recv_buf = b''
logging.info('auth_simple: too short')
return b'E'
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((int(time.time()) & 0xffffffff) - utc_time)
if time_dif < 60 * -3 or time_dif > 60 * 3 or common.int32(utc_time - self.server_info.data.startup_time) < 0:
self.raw_trans = True
self.recv_buf = b''
logging.info('auth_simple: wrong timestamp, time_dif %d, data %s' % (time_dif, binascii.hexlify(out_buf),))
return b'E'
elif self.server_info.data.insert(client_id, connection_id):
self.has_recv_header = True
out_buf = out_buf[12:]
self.client_id = client_id
self.connection_id = connection_id
else:
self.raw_trans = True
self.recv_buf = b''
logging.info('auth_simple: auth fail, data %s' % (binascii.hexlify(out_buf),))
return b'E'
self.recv_buf = self.recv_buf[length:]
if out_buf:
self.server_info.data.update(self.client_id, self.connection_id)
self.decrypt_packet_num += 1
return out_buf
def _handle_stage_addr(self, data):
try:
if self._is_local:
cmd = common.ord(data[1])
if cmd == CMD_UDP_ASSOCIATE:
logging.debug('UDP associate')
if self._local_sock.family == socket.AF_INET6:
header = b'\x05\x00\x00\x04'
else:
header = b'\x05\x00\x00\x01'
addr, port = self._local_sock.getsockname()[:2]
addr_to_send = socket.inet_pton(self._local_sock.family,
addr)
port_to_send = struct.pack('>H', port)
self._write_to_sock(header + addr_to_send + port_to_send,
self._local_sock)
self._stage = STAGE_UDP_ASSOC
# just wait for the client to disconnect
return
elif cmd == CMD_CONNECT:
# just trim VER CMD RSV
data = data[3:]
else:
logging.error('unknown command %d', cmd)
self.destroy()
return
header_result = parse_header(data)
if header_result is None:
raise Exception('can not parse header')
addrtype, remote_addr, remote_port, header_length = header_result
logging.info('connecting %s:%d' % (common.to_str(remote_addr),
remote_port))
self._remote_address = (remote_addr, remote_port)
# pause reading
self._update_stream(STREAM_UP, WAIT_STATUS_WRITING)
self._stage = STAGE_DNS
if self._is_local:
# forward address to remote
self._write_to_sock((b'\x05\x00\x00\x01'
b'\x00\x00\x00\x00\x10\x10'),
self._local_sock)
data_to_send = self._encryptor.encrypt(data)
self._data_to_write_to_remote.append(data_to_send)
# notice here may go into _handle_dns_resolved directly
# Here uses the resolve in dns_server, dns_server could perform like a portable module
self._dns_resolver.resolve(self._chosen_server[0],
self._handle_dns_resolved)
else:
if len(data) > header_length:
self._data_to_write_to_remote.append(data[header_length:])
# notice here may go into _handle_dns_resolved directly
self._dns_resolver.resolve(remote_addr,
self._handle_dns_resolved)
except Exception as e:
logging.error(e)
if self._config['verbose']:
traceback.print_exc()
# TODO use logging when debug completed
self.destroy()
def _handle_server(self):
server = self._server_socket
data, r_addr = server.recvfrom(BUF_SIZE)
ogn_data = data
if not data:
logging.debug('UDP handle_server: data is empty')
if self._stat_callback:
self._stat_callback(self._listen_port, len(data))
uid = None
if self._is_local:
frag = common.ord(data[2])
if frag != 0:
logging.warn('drop a message since frag is not 0')
return
else:
data = data[3:]
else:
ref_iv = [0]
data = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key, self._method, 0, data, ref_iv)
# decrypt data
if not data:
logging.debug('UDP handle_server: data is empty after decrypt')
return
self._protocol.obfs.server_info.recv_iv = ref_iv[0]
data, uid = self._protocol.server_udp_post_decrypt(data)
#logging.info("UDP data %s" % (binascii.hexlify(data),))
if not self._is_local:
data = pre_parse_header(data)
if data is None:
return
try:
header_result = parse_header(data)
except:
self._handel_protocol_error(r_addr, ogn_data)
return
if header_result is None:
self._handel_protocol_error(r_addr, ogn_data)
return
connecttype, addrtype, dest_addr, dest_port, header_length = header_result
if self._is_local:
addrtype = 3
server_addr, server_port = self._get_a_server()
else:
server_addr, server_port = dest_addr, dest_port
if (addrtype & 7) == 3:
af = common.is_ip(server_addr)
if af == False:
handler = common.UDPAsyncDNSHandler((data, r_addr, uid, header_length))
handler.resolve(self._dns_resolver, (server_addr, server_port), self._handle_server_dns_resolved)
else:
self._handle_server_dns_resolved("", (server_addr, server_port), server_addr, (data, r_addr, uid, header_length))
else:
self._handle_server_dns_resolved("", (server_addr, server_port), server_addr, (data, r_addr, uid, header_length))
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 parse_name(data, offset):
p = offset
labels = []
l = common.ord(data[p])
while l > 0:
if (l & (128 + 64)) == (128 + 64):
# pointer
pointer = struct.unpack('!H', data[p:p + 2])[0]
pointer &= 0x3FFF
r = parse_name(data, pointer)
labels.append(r[1])
p += 2
# pointer is the end
return p - offset, b'.'.join(labels)
else:
labels.append(data[p + 1:p + 1 + l])
p += 1 + l
l = common.ord(data[p])
return p - offset + 1, b'.'.join(labels)
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_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 get_table(key):
m = hashlib.md5()
m.update(key)
s = m.digest()
a, b = struct.unpack('<QQ', s)
table = maketrans(b'', b'')
table = [table[i: i + 1] for i in range(len(table))]
for i in range(1, 1024):
table.sort(key=lambda x: int(a % (ord(x) + i)))
return table
def client_pre_encrypt(self, buf):
ret = b''
if not self.has_sent_header:
datalen = max(len(buf), common.ord(os.urandom(1)[0]) % 32 + 4)
ret += self.pack_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 rnd_data(self, buf_size):
if buf_size > 1200:
return b'\x01'
if buf_size > 400:
rnd_data = os.urandom(common.ord(os.urandom(1)[0]) % 256)
else:
rnd_data = os.urandom(struct.unpack('>H', os.urandom(2))[0] % 512)
if len(rnd_data) < 128:
return common.chr(len(rnd_data) + 1) + rnd_data
else:
return common.chr(255) + struct.pack('>H', len(rnd_data) + 3) + rnd_data
def _check_auth_method(self, data):
# VER, NMETHODS, and at least 1 METHODS
if len(data) < 3:
logging.warning('method selection header too short')
raise BadSocksHeader
socks_version = common.ord(data[0])
nmethods = common.ord(data[1])
if socks_version != 5:
logging.warning('unsupported SOCKS protocol version ' +
str(socks_version))
raise BadSocksHeader
if nmethods < 1 or len(data) != nmethods + 2:
logging.warning('NMETHODS and number of METHODS mismatch')
raise BadSocksHeader
noauth_exist = False
for method in data[2:]:
if common.ord(method) == METHOD_NOAUTH:
noauth_exist = True
break
if not noauth_exist:
logging.warning('none of SOCKS METHOD\'s '
'requested by client is supported')
raise NoAcceptableMethods
def rnd_data_len(self, buf_size, full_buf_size):
if full_buf_size >= self.server_info.buffer_size:
return 0
tcp_mss = self.server_info.tcp_mss
rev_len = tcp_mss - buf_size - 9
if rev_len == 0:
return 0
if rev_len < 0:
if rev_len > -tcp_mss:
return self.trapezoid_random_int(rev_len + tcp_mss, -0.3)
return common.ord(os.urandom(1)[0]) % 32
if buf_size > 900:
return struct.unpack('>H', os.urandom(2))[0] % rev_len
return self.trapezoid_random_int(rev_len, -0.3)
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('<I', crc)
if self.raw_trans_recv:
ret = self.send_buffer
self.send_buffer = b''
self.raw_trans_sent = True
return ret
return b''
def parse_name(data, offset):
# obtain the first byte pointed by offset
# it is either a length octet followed by a label or another pointer or a termination
# common.ord() converts it from ASCII char to number
p = offset
labels = []
l = common.ord(data[p])
# while not a termination
while l > 0:
# if the first byte is a pointer
# dig into it, retrieve the innermost labels and append it as tail
# then return directly
# this is because pointer, if exists, is at the end of label sequence
if (l & (128 + 64)) == (128 + 64):
# pointer
pointer = struct.unpack('!H', data[p:p + 2])[0]
pointer &= 0x3FFF
r = parse_name(data, pointer)
labels.append(r[1])
p += 2
# pointer is the end
return p - offset, b'.'.join(labels)
# if the first byte is a length octet
# append label according to length
# then jump to the beginning of the next label
else:
labels.append(data[p + 1:p + 1 + l])
p += 1 + l
l = common.ord(data[p])
# when termination is found, return labels and total length
return p - offset + 1, b'.'.join(labels)
def nonce_increment(nonce, nlen):
"""
Increase nonce by 1 in little endian
From libsodium sodium_increment():
for (; i < nlen; i++) {
c += (uint_fast16_t) n[i];
n[i] = (unsigned char) c;
c >>= 8;
}
:param nonce: string_buffer nonce
:param nlen: nonce length
:return: nonce plus by 1
"""
c = 1
i = 0
# n = create_string_buffer(nlen)
while i < nlen:
c += ord(nonce[i])
nonce[i] = chr(c & 0xFF)
c >>= 8
i += 1
return # n.raw
def server_decode(self, buf):
if self.handshake_status == -1:
return (buf, True, False)
if self.handshake_status == 8:
ret = b''
self.recv_buffer += buf
while len(self.recv_buffer) > 5:
if ord(self.recv_buffer[0]) != 0x17 or ord(
self.recv_buffer[1]) != 0x3 or ord(
self.recv_buffer[2]) != 0x3:
logging.info("data = %s" %
(binascii.hexlify(self.recv_buffer)))
raise Exception('server_decode appdata error')
size = struct.unpack('>H', self.recv_buffer[3:5])[0]
if len(self.recv_buffer) < size + 5:
break
ret += self.recv_buffer[5:size + 5]
self.recv_buffer = self.recv_buffer[size + 5:]
return (ret, True, False)
if self.handshake_status == 3:
verify = buf
verify_len = 43 - 10
if len(buf) < 43:
raise Exception('server_decode data error')
if not match_begin(buf, b"\x14" + self.tls_version +
b"\x00\x01\x01"): #ChangeCipherSpec
raise Exception('server_decode data error')
buf = buf[6:]
if not match_begin(
buf, b"\x16" + self.tls_version + b"\x00\x20"): #Finished
raise Exception('server_decode data error')
if hmac.new(self.server_info.key + self.client_id,
verify[:verify_len], hashlib.sha1).digest(
)[:10] != verify[verify_len:verify_len + 10]:
raise Exception('server_decode data error')
if len(buf) < 37:
raise Exception('server_decode data error')
self.recv_buffer = buf[37:]
self.handshake_status = 8
return self.server_decode(b'')
#raise Exception("handshake data = %s" % (binascii.hexlify(buf)))
self.handshake_status = 2
ogn_buf = buf
if not match_begin(buf, b'\x16\x03\x01'):
return self.decode_error_return(ogn_buf)
buf = buf[3:]
if struct.unpack('>H', buf[:2])[0] != len(buf) - 2:
logging.info("tls_auth wrong tls head size")
return self.decode_error_return(ogn_buf)
buf = buf[2:]
if not match_begin(buf, b'\x01\x00'): #client hello
logging.info("tls_auth not client hello message")
return self.decode_error_return(ogn_buf)
buf = buf[2:]
if struct.unpack('>H', buf[:2])[0] != len(buf) - 2:
logging.info("tls_auth wrong message size")
return self.decode_error_return(ogn_buf)
buf = buf[2:]
if not match_begin(buf, self.tls_version):
logging.info("tls_auth wrong tls version")
return self.decode_error_return(ogn_buf)
buf = buf[2:]
verifyid = buf[:32]
buf = buf[32:]
sessionid_len = ord(buf[0])
if sessionid_len < 32:
logging.info("tls_auth wrong sessionid_len")
return self.decode_error_return(ogn_buf)
sessionid = buf[1:sessionid_len + 1]
buf = buf[sessionid_len + 1:]
self.client_id = sessionid
sha1 = hmac.new(self.server_info.key + sessionid, verifyid[:22],
hashlib.sha1).digest()[:10]
utc_time = struct.unpack('>I', verifyid[:4])[0]
time_dif = common.int32((int(time.time()) & 0xffffffff) - utc_time)
if self.server_info.obfs_param:
try:
self.max_time_dif = int(self.server_info.obfs_param)
except:
pass
if self.max_time_dif > 0 and (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("tls_auth wrong time")
return self.decode_error_return(ogn_buf)
if sha1 != verifyid[22:]:
logging.info("tls_auth wrong sha1")
return self.decode_error_return(ogn_buf)
if self.server_info.data.client_data.get(verifyid[:22]):
logging.info("replay attack detect, id = %s" %
(binascii.hexlify(verifyid)))
return self.decode_error_return(ogn_buf)
self.server_info.data.client_data.sweep()
self.server_info.data.client_data[verifyid[:22]] = sessionid
# (buffer_to_recv, is_need_decrypt, is_need_to_encode_and_send_back)
buf = buf[48:]
host_name = ''
for index in range(len(buf)):
if index + 4 < len(buf):
if buf[index:index + 4] == b"\x00\x17\x00\x00":
if buf[:index] != '':
host_name = buf[:index]
return (b'', False, True, host_name)
def _handle_server(self):
server = self._server_socket
data, r_addr = server.recvfrom(BUF_SIZE)
key = None
iv = None
if not data:
logging.debug('UDP handle_server: data is empty')
if self._stat_callback:
self._stat_callback(self._listen_port, len(data))
if self._is_local:
# +----+------+------+----------+----------+----------+
# |RSV | FRAG | ATYP | DST.ADDR | DST.PORT | DATA |
# +----+------+------+----------+----------+----------+
# ~~~~~~~~
frag = common.ord(data[2]) #shadowsocks中FRAG就使用0
if frag != 0:
logging.warn('UDP drop a message since frag is not 0')
return
else:
# +------+----------+----------+----------+
# | ATYP | DST.ADDR | DST.PORT | DATA |
# +------+----------+----------+----------+
data = data[3:]
else:
data, key, iv = encrypt.dencrypt_all(self._password, self._method,
data)
# decrypt data
if not data:
logging.debug('UDP handle_server: data is empty after decrypt')
return
header_result = parse_header(data)
if header_result is None:
return
# +------+----------+----------+----------+
# | ATYP | DST.ADDR | DST.PORT | DATA |
# +------+----------+----------+----------+
# . .
# |<----- header_length ------>|
addrtype, dest_addr, dest_port, header_length = header_result
# 如果是sslocal，则需要查找的是ssserver的地址及端口
# 如果是ssserver，则需要获取的是目标服务器的地址及端口
if self._is_local:
# ssserver 地址和端口
server_addr, server_port = self._get_a_server()
else:
# 「目标服务器」地址和端口
server_addr, server_port = dest_addr, dest_port
# spec https://shadowsocks.org/en/spec/one-time-auth.html
self._ota_enable_session = addrtype & ADDRTYPE_AUTH
if self._ota_enable and not self._ota_enable_session:
logging.warn('client one time auth is required')
return
if self._ota_enable_session:
if len(data) < header_length + ONETIMEAUTH_BYTES:
logging.warn('UDP one time auth header is too short')
return
_hash = data[-ONETIMEAUTH_BYTES:]
data = data[:-ONETIMEAUTH_BYTES]
_key = iv + key
if onetimeauth_verify(_hash, data, _key) is False:
logging.warn('UDP one time auth fail')
return
# 从缓存中取 server_addr 解析后的地址
addrs = self._dns_cache.get(server_addr, None)
# 如果找不到，则解析 server_addr 的地址并存入缓存
if addrs is None:
# 注意，getaddrinfo 函数是阻塞的
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs:
# drop
return
else:
self._dns_cache[server_addr] = addrs
af, socktype, proto, canonname, sa = addrs[0]
# 根据地址、端口、af 生成一个 key，这个 key 与 UDP 套接字一一对应
key = client_key(r_addr, af)
client = self._cache.get(key, None)
if not client:
# TODO async getaddrinfo
if self._forbidden_iplist:
if common.to_str(sa[0]) in self._forbidden_iplist:
logging.debug('IP %s is in forbidden list, drop' %
common.to_str(sa[0]))
# drop
return
# 创建 UDP 套接字
client = socket.socket(af, socktype, proto)
client.setblocking(False)
self._cache[key] = client
# 将套接字与其地址关联起来，`_handle_client` 会用到
self._client_fd_to_server_addr[client.fileno()] = r_addr
# 将套接字关联的文件描述符加入 `self._sockets` 中，`handle_event` 会用到
self._sockets.add(client.fileno())
# 将套接字加入事件循环，
self._eventloop.add(client, eventloop.POLL_IN, self)
# 如果是 sslocal，那么需要将数据加密
if self._is_local:
key, iv, m = encrypt.gen_key_iv(self._password, self._method)
# spec https://shadowsocks.org/en/spec/one-time-auth.html
if self._ota_enable_session:
data = self._ota_chunk_data_gen(key, iv, data)
data = encrypt.encrypt_all_m(key, iv, m, self._method, data)
if not data:
return
# 如果是 ssserver，在将接收到的数据发送给目标服务器之前，
# 需要解密并且去掉头部，解密在上面已经完成了
else:
# +------+----------+----------+----------+
# | ATYP | DST.ADDR | DST.PORT | DATA |
# +------+----------+----------+----------+
#
data = data[header_length:]
if not data:
return
# - 对于 sslocal 而言，将加密后的数据发送给 ssserver，数据格式如下：
#
# +------+----------+----------+----------+
# | ATYP | DST.ADDR | DST.PORT | DATA |
# +------+----------+----------+----------+
#
# - 对于 ssserver 而言，将解密后的数据发送给目标服务器（只剩 `DATA` 部分了）
try:
client.sendto(data, (server_addr, server_port))
except IOError as e:
err = eventloop.errno_from_exception(e)
if err in (errno.EINPROGRESS, errno.EAGAIN):
pass
else:
shell.print_exception(e)
def server_encode(self, buf):
if self.has_sent_header:
return buf
self.has_sent_header = True
return os.urandom(common.ord(os.urandom(1)[0]) % 96 + 4)
def server_decode(self, buf):
if self.deobfs_stage == -1:
return (buf, True, False)
if self.deobfs_stage == 1:
ret = b''
self.recv_buffer += buf
while len(self.recv_buffer) > 5:
if ord(self.recv_buffer[0]) != 0x17 or ord(
self.recv_buffer[1]) != 0x3 or ord(
self.recv_buffer[2]) != 0x3:
logging.info("data = %s" %
(binascii.hexlify(self.recv_buffer)))
raise Exception('server_decode appdata error')
size = struct.unpack('>H', self.recv_buffer[3:5])[0]
if len(self.recv_buffer) < size + 5:
break
ret += self.recv_buffer[5:size + 5]
self.recv_buffer = self.recv_buffer[size + 5:]
return (ret, True, False)
#raise Exception("handshake data = %s" % (binascii.hexlify(buf)))
self.recv_buffer += buf
buf = self.recv_buffer
ogn_buf = buf
if len(buf) < 5:
return (b'', False, False)
if not match_begin(buf, b'\x16\x03\x01'):
return self.decode_error_return(ogn_buf)
buf = buf[3:]
header_len = struct.unpack('>H', buf[:2])[0]
if header_len > len(buf) - 2:
return (b'', False, False)
self.recv_buffer = self.recv_buffer[header_len + 5:]
self.deobfs_stage = 1
buf = buf[2:header_len + 2]
if not match_begin(buf, b'\x01\x00'): #client hello
logging.info("tls_auth not client hello message")
return self.decode_error_return(ogn_buf)
buf = buf[2:]
if struct.unpack('>H', buf[:2])[0] != len(buf) - 2:
logging.info("tls_auth wrong message size")
return self.decode_error_return(ogn_buf)
buf = buf[2:]
if not match_begin(buf, self.tls_version):
logging.info("tls_auth wrong tls version")
return self.decode_error_return(ogn_buf)
buf = buf[2:]
verifyid = buf[:32]
buf = buf[32:]
sessionid_len = ord(buf[0])
if sessionid_len < 32:
logging.info("tls_auth wrong sessionid_len")
return self.decode_error_return(ogn_buf)
sessionid = buf[1:sessionid_len + 1]
buf = buf[sessionid_len + 1:]
self.client_id = sessionid
utc_time = struct.unpack('>I', verifyid[:4])[0]
time_dif = common.int32((int(time.time()) & 0xffffffff) - utc_time)
if self.server_info.obfs_param:
try:
self.max_time_dif = int(self.server_info.obfs_param)
except:
pass
if self.max_time_dif > 0 and (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("tls_auth wrong time")
return self.decode_error_return(ogn_buf)
if self.server_info.data.client_data.get(verifyid[:22]):
logging.info("replay attack detect, id = %s" %
(binascii.hexlify(verifyid)))
return self.decode_error_return(ogn_buf)
self.server_info.data.client_data.sweep()
self.server_info.data.client_data[verifyid[:22]] = sessionid
# (buffer_to_recv, is_need_decrypt, is_need_to_encode_and_send_back)
buf = buf[62:]
if not match_begin(buf, b'\x00\x23'):
logging.info("ext header error")
return self.decode_error_return(ogn_buf)
buf = buf[2:]
ext_length = struct.unpack('>H', buf[:2])[0]
buf = buf[2:]
ret = buf[:ext_length]
if len(self.recv_buffer) > 0:
ret += self.server_decode(b'')[0]
buf = buf[ext_length:]
host_name = b''
buf = buf[7:]
host_name_len = struct.unpack('>H', buf[:2])[0]
buf = buf[2:]
hostname = buf[:host_name_len]
host_name = common.to_str(hostname)
return (ret, True, False, host_name)
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 _handle_server(self):
server = self._server_socket
data, r_addr = server.recvfrom(BUF_SIZE)
ogn_data = data
if not data:
logging.debug('UDP handle_server: data is empty')
if self._stat_callback:
self._stat_callback(self._listen_port, len(data))
uid = None
if self._is_local:
frag = common.ord(data[2])
if frag != 0:
logging.warn('Drop a message since frag is not 0')
return
else:
data = data[3:]
else:
ref_iv = [0]
data = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key,
self._method, 0, data, ref_iv)
# decrypt data
if not data:
logging.debug('UDP handle_server: data is empty after decrypt')
return
self._protocol.obfs.server_info.recv_iv = ref_iv[0]
data, uid = self._protocol.server_udp_post_decrypt(data)
#logging.info("UDP data %s" % (binascii.hexlify(data),))
if not self._is_local:
data = pre_parse_header(data)
if data is None:
return
try:
header_result = parse_header(data)
except:
self._handel_protocol_error(r_addr, ogn_data)
return
if header_result is None:
self._handel_protocol_error(r_addr, ogn_data)
return
connecttype, addrtype, dest_addr, dest_port, header_length = header_result
if self._is_local:
addrtype = 3
server_addr, server_port = self._get_a_server()
else:
server_addr, server_port = dest_addr, dest_port
if (addrtype & 7) == 3:
af = common.is_ip(server_addr)
if af == False:
handler = common.UDPAsyncDNSHandler(
(data, r_addr, uid, header_length))
handler.resolve(self._dns_resolver, (server_addr, server_port),
self._handle_server_dns_resolved)
else:
self._handle_server_dns_resolved(
"", (server_addr, server_port), server_addr,
(data, r_addr, uid, header_length))
else:
self._handle_server_dns_resolved(
"", (server_addr, server_port), server_addr,
(data, r_addr, uid, header_length))
def server_decode(self, buf):
if self.raw_trans_recv:
return (buf, True, False)
if self.has_recv_header:
verify = buf
verify_len = 43 - 10
if len(buf) < 43:
raise Exception('server_decode data error')
if not match_begin(buf, b"\x14" + self.tls_version + "\x00\x01\x01"): #ChangeCipherSpec
raise Exception('server_decode data error')
buf = buf[6:]
if not match_begin(buf, b"\x16" + self.tls_version + "\x00\x20"): #Finished
raise Exception('server_decode data error')
if hmac.new(self.server_info.key + self.client_id, verify[:verify_len], hashlib.sha1).digest()[:10] != verify[verify_len:verify_len+10]:
raise Exception('server_decode data error')
if len(buf) < 37:
raise Exception('server_decode data error')
buf = buf[37:]
self.raw_trans_recv = True
return (buf, True, False)
self.has_recv_header = True
ogn_buf = buf
if not match_begin(buf, b'\x16' + self.tls_version):
return self.decode_error_return(ogn_buf)
buf = buf[3:]
if struct.unpack('>H', buf[:2])[0] != len(buf) - 2:
return self.decode_error_return(ogn_buf)
buf = buf[2:]
if not match_begin(buf, b'\x01\x00'): #client hello
return self.decode_error_return(ogn_buf)
buf = buf[2:]
if struct.unpack('>H', buf[:2])[0] != len(buf) - 2:
return self.decode_error_return(ogn_buf)
buf = buf[2:]
if not match_begin(buf, self.tls_version):
return self.decode_error_return(ogn_buf)
buf = buf[2:]
verifyid = buf[:32]
buf = buf[32:]
sessionid_len = ord(buf[0])
if sessionid_len < 32:
logging.info("tls_auth wrong sessionid_len")
return self.decode_error_return(ogn_buf)
sessionid = buf[1:sessionid_len + 1]
buf = buf[sessionid_len+1:]
self.client_id = sessionid
sha1 = hmac.new(self.server_info.key + sessionid, verifyid[:22], hashlib.sha1).digest()[:10]
utc_time = struct.unpack('>I', verifyid[:4])[0]
time_dif = common.int32((int(time.time()) & 0xffffffff) - utc_time)
if time_dif < -self.max_time_dif or time_dif > self.max_time_dif \
or common.int32(utc_time - self.server_info.data.startup_time) < -self.max_time_dif / 2:
logging.info("tls_auth wrong time")
return self.decode_error_return(ogn_buf)
if sha1 != verifyid[22:]:
logging.info("tls_auth wrong sha1")
return self.decode_error_return(ogn_buf)
if self.server_info.data.client_data.get(verifyid[:22]):
logging.info("replay attack detect, id = %s" % (binascii.hexlify(verifyid)))
return self.decode_error_return(ogn_buf)
self.server_info.data.client_data.sweep()
self.server_info.data.client_data[verifyid[:22]] = sessionid
# (buffer_to_recv, is_need_decrypt, is_need_to_encode_and_send_back)
return (b'', False, True)
def _handle_stage_addr(self, ogn_data, data):
try:
if self._is_local:
cmd = common.ord(data[1])
if cmd == CMD_UDP_ASSOCIATE:
logging.debug('UDP associate')
if self._local_sock.family == socket.AF_INET6:
header = b'\x05\x00\x00\x04'
else:
header = b'\x05\x00\x00\x01'
addr, port = self._local_sock.getsockname()[:2]
addr_to_send = socket.inet_pton(self._local_sock.family,
addr)
port_to_send = struct.pack('>H', port)
self._write_to_sock(header + addr_to_send + port_to_send,
self._local_sock)
self._stage = STAGE_UDP_ASSOC
# just wait for the client to disconnect
return
elif cmd == CMD_CONNECT:
# just trim VER CMD RSV
data = data[3:]
else:
logging.error('unknown command %d', cmd)
self.destroy()
return
before_parse_data = data
if self._is_local:
header_result = parse_header(data)
else:
if data is None or FORCE_NEW_PROTOCOL and common.ord(
data[0]) != 0x88 and (~common.ord(data[0])
& 0xff) != 0x88:
data = self._handel_protocol_error(self._client_address,
ogn_data)
data = pre_parse_header(data)
if data is None:
data = self._handel_protocol_error(self._client_address,
ogn_data)
header_result = parse_header(data)
if header_result is None:
data = self._handel_protocol_error(self._client_address,
ogn_data)
header_result = parse_header(data)
connecttype, remote_addr, remote_port, header_length = header_result
logging.info('%s connecting %s:%d from %s:%d' %
((connecttype == 0) and 'TCP'
or 'UDP', common.to_str(remote_addr), remote_port,
self._client_address[0], self._client_address[1]))
self._remote_address = (common.to_str(remote_addr), remote_port)
self._remote_udp = (connecttype != 0)
# pause reading
self._update_stream(STREAM_UP, WAIT_STATUS_WRITING)
self._stage = STAGE_DNS
if self._is_local:
# forward address to remote
self._write_to_sock((b'\x05\x00\x00\x01'
b'\x00\x00\x00\x00\x10\x10'),
self._local_sock)
if CLIENT_NEW_PROTOCOL:
rnd_len = random.randint(1, 32)
total_len = 7 + rnd_len + len(data)
data = b'\x88' + struct.pack(
'>H',
total_len) + chr(rnd_len) + (b' ' *
(rnd_len - 1)) + data
crc = (0xffffffff - binascii.crc32(data)) & 0xffffffff
data += struct.pack('<I', crc)
data = self._obfs.client_pre_encrypt(data)
data_to_send = self._encryptor.encrypt(data)
self._data_to_write_to_remote.append(data_to_send)
# notice here may go into _handle_dns_resolved directly
self._dns_resolver.resolve(self._chosen_server[0],
self._handle_dns_resolved)
else:
if len(data) > header_length:
self._data_to_write_to_remote.append(data[header_length:])
# notice here may go into _handle_dns_resolved directly
self._dns_resolver.resolve(remote_addr,
self._handle_dns_resolved)
except Exception as e:
self._log_error(e)
if self._config['verbose']:
traceback.print_exc()
self.destroy()
def _handle_server(self):
server = self._server_socket
data, r_addr = server.recvfrom(BUF_SIZE)
ogn_data = data
if not data:
logging.debug('UDP handle_server: data is empty')
if self._stat_callback:
self._stat_callback(self._listen_port, len(data))
uid = None
if self._is_local:
frag = common.ord(data[2])
if frag != 0:
logging.warn('drop a message since frag is not 0')
return
else:
data = data[3:]
else:
try:
data, key, ref_iv = encrypt.decrypt_all(
self._password, self._method, data)
except Exception:
logging.debug('UDP handle_server: decrypt data failed')
return
# decrypt data
if not data:
logging.debug('UDP handle_server: data is empty after decrypt')
return
ref_iv = [0]
self._protocol.obfs.server_info.recv_iv = ref_iv[0]
data, uid = self._protocol.server_udp_post_decrypt(data)
if self._config['is_multi_user'] != 0 and data:
if uid:
if uid not in self.mu_server_transfer_ul:
self.mu_server_transfer_ul[uid] = 0
if uid not in self.mu_server_transfer_dl:
self.mu_server_transfer_dl[uid] = 0
if uid not in self.mu_connected_iplist:
self.mu_connected_iplist[uid] = []
if uid not in self.mu_detect_log_list:
self.mu_detect_log_list[uid] = []
if common.getRealIp(
r_addr[0]) not in self.mu_connected_iplist[uid]:
self.mu_connected_iplist[uid].append(
common.getRealIp(r_addr[0]))
else:
raise Exception(
'This port is multi user in single port only,so The connection has been rejected, when connect from %s:%d via port %d'
% (r_addr[0], r_addr[1], self._listen_port))
is_relay = False
#logging.info("UDP data %s" % (binascii.hexlify(data),))
if not self._is_local:
if not self._is_relay(r_addr, ogn_data, uid):
data = pre_parse_header(data)
data = self._pre_parse_udp_header(data)
if data is None:
return
if isinstance(data, tuple):
return
# return self._handle_tcp_over_udp(data, r_addr)
else:
if self._config["is_multi_user"] == 0:
data, is_relay = self._handel_normal_relay(
r_addr, ogn_data)
else:
data, is_relay = self._handel_mu_relay(
r_addr, ogn_data, uid)
try:
header_result = parse_header(data)
except:
self._handel_protocol_error(r_addr, ogn_data)
return
if header_result is None:
self._handel_protocol_error(r_addr, ogn_data)
return
connecttype, addrtype, dest_addr, dest_port, header_length = header_result
if self._is_local:
addrtype = 3
server_addr, server_port = self._get_a_server()
else:
server_addr, server_port = dest_addr, dest_port
if (addrtype & 7) == 3:
af = common.is_ip(server_addr)
if af == False:
handler = common.UDPAsyncDNSHandler(
(data, r_addr, uid, header_length, is_relay))
handler.resolve(self._dns_resolver, (server_addr, server_port),
self._handle_server_dns_resolved)
else:
self._handle_server_dns_resolved(
"", (server_addr, server_port), server_addr,
(data, r_addr, uid, header_length, is_relay))
else:
self._handle_server_dns_resolved(
"", (server_addr, server_port), server_addr,
(data, r_addr, uid, header_length, is_relay))
def _handle_stage_addr(self, data):
logging.debug("Running in the TCPRelayHandler class. [_handle_stage_addr]")
try:
if self._is_local:
cmd = common.ord(data[1])
if cmd == CMD_UDP_ASSOCIATE:
logging.debug('UDP associate')
if self._local_sock.family == socket.AF_INET6:
header = b'\x05\x00\x00\x04'
else:
header = b'\x05\x00\x00\x01'
addr, port = self._local_sock.getsockname()[:2]
addr_to_send = socket.inet_pton(
self._local_sock.family, addr)
port_to_send = struct.pack('>H', port)
self._write_to_sock(
header + addr_to_send + port_to_send, self._local_sock)
self._stage = STAGE_UDP_ASSOC
# just wait for the client to disconnect
return
elif cmd == CMD_CONNECT:
# just trim VER CMD RSV
data = data[3:]
else:
logging.error('unknown command %d' % cmd)
common.error_to_file('unknown command %d' % cmd,self._config)
self.destroy()
return
header_result = parse_header(data,self._config)
if header_result is None:
raise Exception('can not parse header')
addrtype, remote_addr, remote_port, header_length = header_result
logging.info('connecting %s:%d from %s:%d' % (common.to_str(
remote_addr), remote_port, self._client_address[0], self._client_address[1]))
if self._server._listen_port in self._config['forbid']['port']:
for i in self._config['forbid']['site']:
if str(i) in common.to_str(remote_addr):
self.destroy()
try:
if common.to_str(self._config['log']['log_enable']) == "True":
log_str_one_line = '''[%s]\t%s:%d\t%s:%d [server_port: %s]\n''' % (time.strftime(
"%Y-%m-%d %H:%M:%S"), common.to_str(remote_addr), remote_port, self._client_address[0], self._client_address[1],self._server._listen_port)
log_str_buf.append(log_str_one_line)
if os.path.exists(os.path.split(self._config['log']['log_path'])[0]) is False:
os.makedirs(os.path.split(self._config['log']['log_path'])[0])
if len(log_str_buf) == 10:
f = open("%s" % self._config['log']['log_path'], 'a+')
f.write("".join(log_str_buf))
f.close()
del log_str_buf[:]
except Exception as e:
logging.error(
"Sorry.Some ERROR happend when I try to log something to file : info: %s" % str(e))
common.error_to_file("Sorry.Some ERROR happend when I try to log something to file : info: %s" % str(e),self._config)
self._remote_address = (common.to_str(remote_addr), remote_port)
# pause reading
self._update_stream(STREAM_UP, WAIT_STATUS_WRITING)
self._stage = STAGE_DNS
if self._is_local:
# forward address to remote
self._write_to_sock(
(b'\x05\x00\x00\x01' b'\x00\x00\x00\x00\x10\x10'), self._local_sock)
data_to_send = self._encryptor.encrypt(data)
self._data_to_write_to_remote.append(data_to_send)
# notice here may go into _handle_dns_resolved directly
self._dns_resolver.resolve(
self._chosen_server[0], self._handle_dns_resolved)
else:
if len(data) > header_length:
self._data_to_write_to_remote.append(data[header_length:])
# notice here may go into _handle_dns_resolved directly
self._dns_resolver.resolve(
remote_addr, self._handle_dns_resolved)
except Exception as e:
self._log_error(e)
if self._config['verbose']:
traceback.print_exc()
# TODO use logging when debug completed
self.destroy()
def _handle_stage_addr(self, data):
try:
if self._is_local:
cmd = common.ord(data[1])
if cmd == CMD_UDP_ASSOCIATE:
logging.debug('UDP associate')
if self._local_sock.family == socket.AF_INET6:
header = b'\x05\x00\x00\x04'
else:
header = b'\x05\x00\x00\x01'
addr, port = self._local_sock.getsockname()[:2]
addr_to_send = socket.inet_pton(self._local_sock.family,
addr)
port_to_send = struct.pack('>H', port)
self._write_to_sock(header + addr_to_send + port_to_send,
self._local_sock)
self._stage = STAGE_UDP_ASSOC
# just wait for the client to disconnect
return
elif cmd == CMD_CONNECT:
# just trim VER CMD RSV
data = data[3:]
else:
logging.error('unknown command %d', cmd)
self.destroy()
return
header_result = parse_header(data)
if header_result is None:
raise Exception('can not parse header')
addrtype, remote_addr, remote_port, header_length = header_result
if self._ban_list:
link_name = common.to_str(remote_addr)
for b in self._ban_list:
if b in link_name:
raise Exception('link %s is been banned by rule %s' %
(link_name, b))
logging.info('connecting %s:%d from %s:%d' %
(common.to_str(remote_addr), remote_port,
self._client_address[0], self._client_address[1]))
self._remote_address = (common.to_str(remote_addr), remote_port)
# pause reading
self._update_stream(STREAM_UP, WAIT_STATUS_WRITING)
self._stage = STAGE_DNS
if self._is_local:
# forward address to remote
self._write_to_sock((b'\x05\x00\x00\x01'
b'\x00\x00\x00\x00\x10\x10'),
self._local_sock)
data_to_send = self._encryptor.encrypt(data)
self._data_to_write_to_remote.append(data_to_send)
# notice here may go into _handle_dns_resolved directly
self._dns_resolver.resolve(self._chosen_server[0],
self._handle_dns_resolved)
else:
if len(data) > header_length:
self._data_to_write_to_remote.append(data[header_length:])
# notice here may go into _handle_dns_resolved directly
self._dns_resolver.resolve(remote_addr,
self._handle_dns_resolved)
except Exception as e:
self._log_error(e)
if self._config['verbose']:
traceback.print_exc()
self.destroy()
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.recv_buf[:2] + self.salt +
self.server_info.key) & 0xFFFFFFFF)
if crc != self.recv_buf[2:6]:
return self.not_match_return(self.recv_buf)
length = struct.unpack('>H', self.recv_buf[:2])[0]
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_v4 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_v4: 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:
logging.info(
'auth_sha1_v4: 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_v4: 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) > 4:
crc = struct.pack('<H', binascii.crc32(self.recv_buf[:2]) & 0xFFFF)
if crc != self.recv_buf[2:4]:
self.raw_trans = True
logging.info('auth_sha1_v4: wrong crc')
if self.decrypt_packet_num == 0:
logging.info('auth_sha1_v4: wrong crc')
return (b'E' * 2048, False)
else:
raise Exception('server_post_decrype data error')
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_v4: 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_v4: 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[4])
if pos < 255:
pos += 4
else:
pos = struct.unpack('>H', self.recv_buf[5:7])[0] + 4
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)
def _ota_chunk_data_gen(self, key, iv, data):
data = common.chr(common.ord(data[0]) | ADDRTYPE_AUTH) + data[1:]
key = iv + key
return data + onetimeauth_gen(data, key)
def _handle_server(self):
server = self._server_socket
data, r_addr = server.recvfrom(BUF_SIZE)
key = None
iv = None
if not data:
logging.debug('UDP handle_server: data is empty')
if self._stat_callback:
self._stat_callback(self._listen_port, len(data))
# 若本地端从监听1080端口收到本机应用进程（例如chrome）的数据，进行切除header
if self._is_local:
if self._is_tunnel:
# add ss header to data
tunnel_remote = self.tunnel_remote
tunnel_remote_port = self.tunnel_remote_port
data = common.add_header(tunnel_remote,
tunnel_remote_port, data)
else:
frag = common.ord(data[2])
if frag != 0:
logging.warn('UDP drop a message since frag is not 0')
return
else:
data = data[3:]
# 如果是服务端收到本地端发出的udp数据，先进行解密
else:
# decrypt data
try:
data, key, iv = cryptor.decrypt_all(self._password,
self._method,
data, self._crypto_path)
except Exception:
logging.debug('UDP handle_server: decrypt data failed')
return
if not data:
logging.debug('UDP handle_server: data is empty after decrypt')
return
# 处理header
header_result = parse_header(data)
if header_result is None:
return
addrtype, dest_addr, dest_port, header_length = header_result
logging.info("udp data to %s:%d from %s:%d"
% (dest_addr, dest_port, r_addr[0], r_addr[1]))
if self._is_local:
# 如果是local收到，则server_addr server_port都是远程的
server_addr, server_port = self._get_a_server()
else:
# 如果远程收到，则将server_addr这些改成dest_addr dest_port，方便操作
# dest就是最终目标，例如 www.youtube.com:443
server_addr, server_port = dest_addr, dest_port
# spec https://shadowsocks.org/en/spec/one-time-auth.html
self._ota_enable_session = addrtype & ADDRTYPE_AUTH
if self._ota_enable and not self._ota_enable_session:
logging.warn('client one time auth is required')
return
if self._ota_enable_session:
if len(data) < header_length + ONETIMEAUTH_BYTES:
logging.warn('UDP one time auth header is too short')
return
_hash = data[-ONETIMEAUTH_BYTES:]
data = data[: -ONETIMEAUTH_BYTES]
_key = iv + key
if onetimeauth_verify(_hash, data, _key) is False:
logging.warn('UDP one time auth fail')
return
addrs = self._dns_cache.get(server_addr, None)
if addrs is None:
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs:
# drop
return
else:
self._dns_cache[server_addr] = addrs
af, socktype, proto, canonname, sa = addrs[0]
key = client_key(r_addr, af)
client = self._cache.get(key, None)
if not client:
# TODO async getaddrinfo
if self._forbidden_iplist:
if common.to_str(sa[0]) in self._forbidden_iplist:
logging.debug('IP %s is in forbidden list, drop' %
common.to_str(sa[0]))
# drop
return
client = socket.socket(af, socktype, proto)
client.setblocking(False)
self._cache[key] = client
self._client_fd_to_server_addr[client.fileno()] = r_addr
self._sockets.add(client.fileno())
# 添加进Eventloop，标志设置为可读
self._eventloop.add(client, eventloop.POLL_IN, self)
# 如果是local，要向远程发，要过墙，所以要加密
if self._is_local:
key, iv, m = cryptor.gen_key_iv(self._password, self._method)
# spec https://shadowsocks.org/en/spec/one-time-auth.html
if self._ota_enable_session:
data = self._ota_chunk_data_gen(key, iv, data)
try:
data = cryptor.encrypt_all_m(key, iv, m, self._method, data,
self._crypto_path)
except Exception:
logging.debug("UDP handle_server: encrypt data failed")
return
if not data:
return
# 如果是远程，要向dest发请求，所以把除数据的部分除去，即除去header。
else:
# data已经在上面进行数据解密了。不需要像local一样加密发送。
# data已经被切除头的3个字节了
data = data[header_length:]
if not data:
return
try:
# 发送，完美无瑕。。。。
# 这个sendto同时有udp的和tcp的两种，sendto函数主要用于UDP，但这里两种都用了
# 调用sendto时候会自动加上那个首3个字节，貌似是x00 x00 x00
client.sendto(data, (server_addr, server_port))
except IOError as e:
err = eventloop.errno_from_exception(e)
if err in (errno.EINPROGRESS, errno.EAGAIN):
pass
else:
shell.print_exception(e)
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) >= 7 or len(self.recv_buf) in [2, 3]:
recv_len = min(len(self.recv_buf), 7)
mac_key = self.server_info['recv_iv'] + self.server_info['key']
sha1data = hmac.new(mac_key, self.recv_buf[:1],
self.hashfunc).digest()[:recv_len - 1]
if sha1data != self.recv_buf[1:recv_len]:
return self.not_match_return(self.recv_buf)
if len(self.recv_buf) < 31:
return (b'', False)
sha1data = hmac.new(mac_key, self.recv_buf[7:27],
self.hashfunc).digest()[:4]
if sha1data != self.recv_buf[27:31]:
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) < 31 + self.extra_wait_size:
return (b'', False)
return self.not_match_return(self.recv_buf)
uid = self.recv_buf[7:11]
# if uid in self.server_info.users:
# self.user_id = uid
# self.user_key = self.hashfunc(self.server_info.users[uid]).digest()
# self.server_info.update_user_func(uid)
# else:
# if not self.server_info.users:
# self.user_key = self.server_info.key
# else:
# self.user_key = self.server_info.recv_iv
if self.user_key is None:
self.user_key = self.server_info['key']
encryptor = encrypt.Encryptor(
to_bytes(base64.b64encode(self.user_key)) + self.salt,
'aes-128-cbc')
head = encryptor.decrypt(
b'\x00' * 16 + self.recv_buf[11:27] +
b'\x00') # need an extra byte or recv empty
length = struct.unpack('<H', head[12:14])[0]
if len(self.recv_buf) < length:
return (b'', False)
utc_time = struct.unpack('<I', head[:4])[0]
client_id = struct.unpack('<I', head[4:8])[0]
connection_id = struct.unpack('<I', head[8:12])[0]
rnd_len = struct.unpack('<H', head[14:16])[0]
if hmac.new(self.user_key, self.recv_buf[:length - 4],
self.hashfunc).digest()[:4] != self.recv_buf[length -
4:length]:
logging.info('%s: checksum error, data %s' %
(self.no_compatible_method,
binascii.hexlify(self.recv_buf[:length])))
return self.not_match_return(self.recv_buf)
time_dif = common.int32(utc_time - (int(time.time()) & 0xffffffff))
if time_dif < -self.max_time_dif or time_dif > self.max_time_dif:
logging.info('%s: wrong timestamp, time_dif %d, data %s' %
(self.no_compatible_method, time_dif,
binascii.hexlify(head)))
return self.not_match_return(self.recv_buf)
elif self.data.insert(self.user_id, client_id, connection_id):
self.has_recv_header = True
out_buf = self.recv_buf[31 + rnd_len:length - 4]
self.client_id = client_id
self.connection_id = connection_id
else:
logging.info(
'%s: auth fail, data %s' %
(self.no_compatible_method, 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) > 4:
mac_key = self.user_key + struct.pack('<I', self.recv_id)
mac = hmac.new(mac_key, self.recv_buf[:2],
self.hashfunc).digest()[:2]
if mac != self.recv_buf[2:4]:
self.raw_trans = True
logging.info(self.no_compatible_method + ': wrong crc')
if self.recv_id == 0:
logging.info(self.no_compatible_method + ': wrong crc')
return (b'E' * 2048, False)
else:
raise Exception('server_post_decrype data error')
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.recv_id == 0:
logging.info(self.no_compatible_method + ': over size')
return (b'E' * 2048, False)
else:
raise Exception('server_post_decrype data error')
if length > len(self.recv_buf):
break
if hmac.new(mac_key, self.recv_buf[:length - 4],
self.hashfunc).digest()[:4] != self.recv_buf[length -
4:length]:
logging.info('%s: checksum error, data %s' %
(self.no_compatible_method,
binascii.hexlify(self.recv_buf[:length])))
self.raw_trans = True
self.recv_buf = b''
if self.recv_id == 0:
return (b'E' * 2048, False)
else:
raise Exception(
'server_post_decrype data uncorrect checksum')
self.recv_id = (self.recv_id + 1) & 0xFFFFFFFF
pos = common.ord(self.recv_buf[4])
if pos < 255:
pos += 4
else:
pos = struct.unpack('<H', self.recv_buf[5:7])[0] + 4
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.data.update(self.user_id, self.client_id, self.connection_id)
return (out_buf, sendback)
def _handle_server(self):
server = self._server_socket
data, r_addr = server.recvfrom(BUF_SIZE)
key = None
iv = None
if not data:
logging.debug('UDP handle_server: data is empty')
if self._stat_callback:
self._stat_callback(self._listen_port, len(data))
if self._is_local:
if self._is_tunnel:
# add ss header to data
tunnel_remote = self.tunnel_remote
tunnel_remote_port = self.tunnel_remote_port
data = common.add_header(tunnel_remote,
tunnel_remote_port, data)
else:
frag = common.ord(data[2])
if frag != 0:
logging.warn('UDP drop a message since frag is not 0')
return
else:
data = data[3:]
else:
# decrypt data
try:
data, key, iv = cryptor.decrypt_all(self._password,
self._method,
data, self._crypto_path)
except Exception:
logging.debug('UDP handle_server: decrypt data failed')
return
if not data:
logging.debug('UDP handle_server: data is empty after decrypt')
return
header_result = parse_header(data)
if header_result is None:
return
addrtype, dest_addr, dest_port, header_length = header_result
logging.info("udp data to %s:%d from %s:%d"
% (dest_addr, dest_port, r_addr[0], r_addr[1]))
if self._is_local:
server_addr, server_port = self._get_a_server()
else:
server_addr, server_port = dest_addr, dest_port
# spec https://shadowsocks.org/en/spec/one-time-auth.html
self._ota_enable_session = addrtype & ADDRTYPE_AUTH
if self._ota_enable and not self._ota_enable_session:
logging.warn('client one time auth is required')
return
if self._ota_enable_session:
if len(data) < header_length + ONETIMEAUTH_BYTES:
logging.warn('UDP one time auth header is too short')
return
_hash = data[-ONETIMEAUTH_BYTES:]
data = data[: -ONETIMEAUTH_BYTES]
_key = iv + key
if onetimeauth_verify(_hash, data, _key) is False:
logging.warn('UDP one time auth fail')
return
addrs = self._dns_cache.get(server_addr, None)
if addrs is None:
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs:
# drop
return
else:
self._dns_cache[server_addr] = addrs
af, socktype, proto, canonname, sa = addrs[0]
key = client_key(r_addr, af)
client = self._cache.get(key, None)
if not client:
# TODO async getaddrinfo
if self._forbidden_iplist:
if common.to_str(sa[0]) in self._forbidden_iplist:
logging.debug('IP %s is in forbidden list, drop' %
common.to_str(sa[0]))
# drop
return
client = socket.socket(af, socktype, proto)
client.setblocking(False)
self._cache[key] = client
self._client_fd_to_server_addr[client.fileno()] = r_addr
self._sockets.add(client.fileno())
self._eventloop.add(client, eventloop.POLL_IN, self)
if self._is_local:
key, iv, m = cryptor.gen_key_iv(self._password, self._method)
# spec https://shadowsocks.org/en/spec/one-time-auth.html
if self._ota_enable_session:
data = self._ota_chunk_data_gen(key, iv, data)
try:
data = cryptor.encrypt_all_m(key, iv, m, self._method, data,
self._crypto_path)
except Exception:
logging.debug("UDP handle_server: encrypt data failed")
return
if not data:
return
else:
data = data[header_length:]
if not data:
return
try:
client.sendto(data, (server_addr, server_port))
except IOError as e:
err = eventloop.errno_from_exception(e)
if err in (errno.EINPROGRESS, errno.EAGAIN):
pass
else:
shell.print_exception(e)
def _handle_server(self):
server = self._server_socket
data, r_addr = server.recvfrom(BUF_SIZE)
if not data:
logging.debug('UDP handle_server: data is empty')
if self._stat_callback:
self._stat_callback(self._listen_port, len(data))
# note(yan): server接受到数据
if self._is_local:
# note(yan): 如果是local的话，收到的是SOCKS5 UDP request.
frag = common.ord(data[2])
if frag != 0:
logging.warn('drop a message since frag is not 0')
return
else:
data = data[3:]
else:
# note(yan): 否则，收到的是shadowsocks encrypted udp request.
# 注意ss udp request的后半段，和socks5 udp request完全一致
data = encrypt.encrypt_all(self._password, self._method, 0, data)
# decrypt data
if not data:
logging.debug('UDP handle_server: data is empty after decrypt')
return
header_result = parse_header(data)
if header_result is None:
return
addrtype, dest_addr, dest_port, header_length = header_result
# note(yan): 如果是local的话，那么dest_addr/port在配置中
# 否则dest_addr/port在请求里面
if self._is_local:
server_addr, server_port = self._get_a_server()
else:
server_addr, server_port = dest_addr, dest_port
addrs = self._dns_cache.get(server_addr, None)
if addrs is None:
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs:
# drop
return
else:
self._dns_cache[server_addr] = addrs
af, socktype, proto, canonname, sa = addrs[0]
# note(yan): 找到对应的proxy client. 所有的proxy都需要管理
# <c, c>这样的pair集合
key = client_key(r_addr, af)
client = self._cache.get(key, None)
if not client:
# TODO async getaddrinfo
if self._forbidden_iplist:
if common.to_str(sa[0]) in self._forbidden_iplist:
logging.debug('IP %s is in forbidden list, drop' %
common.to_str(sa[0]))
# drop
return
client = socket.socket(af, socktype, proto)
client.setblocking(False)
self._cache[key] = client
self._client_fd_to_server_addr[client.fileno()] = r_addr
self._sockets.add(client.fileno())
self._eventloop.add(client, eventloop.POLL_IN, self)
if self._is_local:
data = encrypt.encrypt_all(self._password, self._method, 1, data)
if not data:
return
else:
data = data[header_length:]
if not data:
return
try:
client.sendto(data, (server_addr, server_port))
except IOError as e:
err = eventloop.errno_from_exception(e)
if err in (errno.EINPROGRESS, errno.EAGAIN):
pass
else:
shell.print_exception(e)
def server_post_decrypt(self, buf):
if self.raw_trans:
return buf
self.recv_buf += buf
out_buf = b''
if not self.has_recv_header:
if len(self.recv_buf) < 4:
return b''
crc = struct.pack(
'<I',
binascii.crc32(self.server_info.key) & 0xFFFFFFFF)
if crc != self.recv_buf[:4]:
if self.method == 'auth_sha1':
return b'E'
else:
self.raw_trans = True
return self.recv_buf
length = struct.unpack('>H', self.recv_buf[4:6])[0]
if length > len(self.recv_buf):
return b''
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 b'E'
pos = common.ord(self.recv_buf[6]) + 6
out_buf = self.recv_buf[pos:length - 10]
if len(out_buf) < 12:
self.raw_trans = True
self.recv_buf = b''
logging.info('auth_sha1: too short')
return b'E'
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((int(time.time()) & 0xffffffff) - utc_time)
if time_dif < -self.max_time_dif or time_dif > self.max_time_dif \
or common.int32(utc_time - self.server_info.data.startup_time) < -self.max_time_dif / 2:
self.raw_trans = True
self.recv_buf = b''
logging.info(
'auth_sha1: wrong timestamp, time_dif %d, data %s' % (
time_dif,
binascii.hexlify(out_buf),
))
return b'E'
elif self.server_info.data.insert(client_id, connection_id):
self.has_recv_header = True
out_buf = out_buf[12:]
self.client_id = client_id
self.connection_id = connection_id
else:
self.raw_trans = True
self.recv_buf = b''
logging.info('auth_sha1: auth fail, data %s' %
(binascii.hexlify(out_buf), ))
return b'E'
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'
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'
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
def _handle_server(self):
server = self._server_socket
data, r_addr = server.recvfrom(BUF_SIZE)
client_address = r_addr[0]
key = None
iv = None
if not data:
logging.debug('U[%d] UDP handle_server: data is empty' %
self._config['server_port'])
if self._stat_callback:
self._stat_callback(self._listen_port, len(data))
if self._is_local:
if self._is_tunnel:
# add ss header to data
tunnel_remote = self.tunnel_remote
tunnel_remote_port = self.tunnel_remote_port
data = common.add_header(tunnel_remote,
tunnel_remote_port, data)
else:
frag = common.ord(data[2])
if frag != 0:
logging.warn('UDP drop a message since frag is not 0')
return
else:
data = data[3:]
else:
# decrypt data
try:
data, key, iv = cryptor.decrypt_all(self._password,
self._method,
data)
except Exception:
logging.debug('U[%d] UDP handle_server: decrypt data failed' % self._config[
'server_port'])
return
if not data:
logging.debug(
'U[%d] UDP handle_server: data is empty after decrypt' % self._config[
'server_port']
)
return
header_result = parse_header(data)
if header_result is None:
return
addrtype, dest_addr, dest_port, header_length = header_result
if self._config['firewall_ports'] and self._config['server_port'] not in self._config['firewall_trusted']:
# Firewall enabled
if self._config['firewall_mode'] == 'blacklist' and dest_port in self._config['firewall_ports']:
firewall_blocked = True
elif self._config['firewall_mode'] == 'whitelist' and dest_port not in self._config['firewall_ports']:
firewall_blocked = True
else:
firewall_blocked = False
else:
firewall_blocked = False
if firewall_blocked:
logging.warning('U[%d] UDP PORT BANNED: RP[%d] A[%s-->%s]' % (
self._config['server_port'], dest_port,
client_address, common.to_str(dest_addr)
))
return
else:
logging.info('U[%d] UDP CONN: RP[%d] A[%s-->%s]' % (
self._config['server_port'], dest_port,
client_address, common.to_str(dest_addr)
))
if self._is_local:
server_addr, server_port = self._get_a_server()
else:
server_addr, server_port = dest_addr, dest_port
# spec https://shadowsocks.org/en/spec/one-time-auth.html
self._ota_enable_session = addrtype & ADDRTYPE_AUTH
if self._ota_enable and not self._ota_enable_session:
logging.warn('client one time auth is required')
return
if self._ota_enable_session:
if len(data) < header_length + ONETIMEAUTH_BYTES:
logging.warn('U[%d] UDP one time auth header is too short' % self._config[
'server_port'])
return
_hash = data[-ONETIMEAUTH_BYTES:]
data = data[: -ONETIMEAUTH_BYTES]
_key = iv + key
if onetimeauth_verify(_hash, data, _key) is False:
logging.warn('U[%d] UDP one time auth fail' %
self._config['server_port'])
return
addrs = self._dns_cache.get(server_addr, None)
if addrs is None:
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs:
# drop
return
else:
self._dns_cache[server_addr] = addrs
af, socktype, proto, canonname, sa = addrs[0]
key = client_key(r_addr, af)
client = self._cache.get(key, None)
if not client:
# TODO async getaddrinfo
if self._forbidden_iplist:
if common.to_str(sa[0]) in self._forbidden_iplist:
logging.debug('U[%d] IP %s is in forbidden list, drop' %
(self._config['server_port'], common.to_str(sa[0])))
# drop
return
client = socket.socket(af, socktype, proto)
client.setblocking(False)
self._cache[key] = client
self._client_fd_to_server_addr[client.fileno()] = r_addr
self._sockets.add(client.fileno())
self._eventloop.add(client, eventloop.POLL_IN, self)
if self._is_local:
key, iv, m = cryptor.gen_key_iv(self._password, self._method)
# spec https://shadowsocks.org/en/spec/one-time-auth.html
if self._ota_enable_session:
data = self._ota_chunk_data_gen(key, iv, data)
try:
data = cryptor.encrypt_all_m(key, iv, m, self._method, data,
self._crypto_path)
except Exception:
logging.debug("UDP handle_server: encrypt data failed")
return
if not data:
return
else:
data = data[header_length:]
if not data:
return
try:
client.sendto(data, (server_addr, server_port))
except (socket.error, OSError, IOError) as e:
error_no = eventloop.errno_from_exception(e)
if sys.platform == "win32":
if error_no in (errno.EAGAIN, errno.EINPROGRESS,
errno.EWOULDBLOCK, errno.WSAEWOULDBLOCK):
pass
else:
shell.print_exception(e)
elif error_no in (errno.EAGAIN, errno.EINPROGRESS,
errno.EWOULDBLOCK):
pass
else:
shell.print_exception(e)
def _handle_server(self):
server = self._server_socket
data, r_addr = server.recvfrom(BUF_SIZE)
if not data:
logging.debug('UDP handle_server: data is empty')
if self._is_local:
frag = common.ord(data[2])
if frag != 0:
logging.warn('drop a message since frag is not 0')
return
else:
data = data[3:]
else:
data = encrypt.encrypt_all(self._password, self._method, 0, data)
# decrypt data
if not data:
logging.debug('UDP handle_server: data is empty after decrypt')
return
header_result = parse_header(data)
if header_result is None:
return
addrtype, dest_addr, dest_port, header_length = header_result
if self._is_local:
server_addr, server_port = self._get_a_server()
else:
server_addr, server_port = dest_addr, dest_port
key = client_key(r_addr[0], r_addr[1], dest_addr, dest_port)
client = self._cache.get(key, None)
if not client:
# TODO async getaddrinfo
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if addrs:
af, socktype, proto, canonname, sa = addrs[0]
if self._forbidden_iplist:
if common.to_str(sa[0]) in self._forbidden_iplist:
logging.debug('IP %s is in forbidden list, drop' %
common.to_str(sa[0]))
# drop
return
client = socket.socket(af, socktype, proto)
client.setblocking(False)
self._cache[key] = client
self._client_fd_to_server_addr[client.fileno()] = r_addr
else:
# drop
return
self._sockets.add(client.fileno())
self._eventloop.add(client, eventloop.POLL_IN)
if self._is_local:
data = encrypt.encrypt_all(self._password, self._method, 1, data)
if not data:
return
else:
data = data[header_length:]
if not data:
return
try:
client.sendto(data, (server_addr, server_port))
except IOError as e:
err = eventloop.errno_from_exception(e)
if err in (errno.EINPROGRESS, errno.EAGAIN):
pass
else:
shell.print_exception(e)
def _handle_stage_addr(self, data):
try:
if self._is_local:
cmd = common.ord(data[1])
if cmd == CMD_UDP_ASSOCIATE:
logging.debug('UDP associate')
if self._local_sock.family == socket.AF_INET6:
header = b'\x05\x00\x00\x04'
else:
header = b'\x05\x00\x00\x01'
addr, port = self._local_sock.getsockname()[:2]
addr_to_send = socket.inet_pton(self._local_sock.family,
addr)
port_to_send = struct.pack('>H', port)
self._write_to_sock(header + addr_to_send + port_to_send,
self._local_sock)
self._stage = STAGE_UDP_ASSOC
# just wait for the client to disconnect
return
elif cmd == CMD_CONNECT:
# just trim VER CMD RSV
data = data[3:]
else:
logging.error('unknown command %d', cmd)
self.destroy()
return
header_result = parse_header(data)
if header_result is None:
raise Exception('can not parse header')
addrtype, remote_addr, remote_port, header_length = header_result
logging.info('connecting %s:%d from %s:%d' %
(common.to_str(remote_addr), remote_port,
self._client_address[0], self._client_address[1]))
if self._is_local is False:
# spec https://shadowsocks.org/en/spec/one-time-auth.html
if self._ota_enable or addrtype & ADDRTYPE_AUTH:
if len(data) < header_length + ONETIMEAUTH_BYTES:
logging.warn('one time auth header is too short')
return None
offset = header_length + ONETIMEAUTH_BYTES
_hash = data[header_length: offset]
_data = data[:header_length]
key = self._encryptor.decipher_iv + self._encryptor.key
if onetimeauth_verify(_hash, _data, key) is False:
logging.warn('one time auth fail')
self.destroy()
header_length += ONETIMEAUTH_BYTES
self._remote_address = (common.to_str(remote_addr), remote_port)
# pause reading
self._update_stream(STREAM_UP, WAIT_STATUS_WRITING)
self._stage = STAGE_DNS
if self._is_local:
# forward address to remote
self._write_to_sock((b'\x05\x00\x00\x01'
b'\x00\x00\x00\x00\x10\x10'),
self._local_sock)
# spec https://shadowsocks.org/en/spec/one-time-auth.html
# ATYP & 0x10 == 1, then OTA is enabled.
if self._ota_enable:
data = common.chr(addrtype | ADDRTYPE_AUTH) + data[1:]
key = self._encryptor.cipher_iv + self._encryptor.key
data += onetimeauth_gen(data, key)
data_to_send = self._encryptor.encrypt(data)
self._data_to_write_to_remote.append(data_to_send)
# notice here may go into _handle_dns_resolved directly
self._dns_resolver.resolve(self._chosen_server[0],
self._handle_dns_resolved)
else:
if self._ota_enable:
data = data[header_length:]
self._ota_chunk_data(data,
self._data_to_write_to_remote.append)
elif len(data) > header_length:
self._data_to_write_to_remote.append(data[header_length:])
# notice here may go into _handle_dns_resolved directly
self._dns_resolver.resolve(remote_addr,
self._handle_dns_resolved)
except Exception as e:
self._log_error(e)
if self._config['verbose']:
traceback.print_exc()
self.destroy()
def client_udp_pre_encrypt(self, buf):
ret = self.pack_auth_data(buf)
return chr(ord(buf[0]) | 0x10) + buf[1:]
def server_post_decrypt(self, buf):
if self.raw_trans:
return buf
self.recv_buf += buf
out_buf = b''
if not self.has_recv_header:
if len(self.recv_buf) < 4:
return b''
crc = struct.pack(
'<I',
binascii.crc32(self.salt + self.server_info.key) & 0xFFFFFFFF)
if crc != self.recv_buf[:4]:
if self.method == 'auth_sha1_v2':
return b'E'
else:
self.raw_trans = True
return self.recv_buf
length = struct.unpack('>H', self.recv_buf[4:6])[0]
if length > len(self.recv_buf):
return b''
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 b'E'
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) < 8:
self.raw_trans = True
self.recv_buf = b''
logging.info('auth_sha1_v2: too short')
return b'E'
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:
self.raw_trans = True
self.recv_buf = b''
logging.info('auth_sha1_v2: auth fail, data %s' %
(binascii.hexlify(out_buf), ))
return b'E'
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_v2: over size')
return b'E'
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'
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 out_buf:
self.server_info.data.update(self.client_id, self.connection_id)
self.decrypt_packet_num += 1
return out_buf
def _write_to_sock(self, data, sock):
# 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 sock:
return False
#logging.debug("_write_to_sock %s %s %s" % (self._remote_sock, sock, self._remote_udp))
uncomplete = False
if self._remote_udp and sock == self._remote_sock:
try:
self._udp_data_send_buffer += data
#logging.info('UDP over TCP sendto %d %s' % (len(data), binascii.hexlify(data)))
while len(self._udp_data_send_buffer) > 6:
length = struct.unpack('>H',
self._udp_data_send_buffer[:2])[0]
if length >= 0xff00:
length = struct.unpack(
'>H', self._udp_data_send_buffer[1:3])[0] + 0xff00
if length > len(self._udp_data_send_buffer):
break
data = self._udp_data_send_buffer[:length]
if length >= 0xff00:
data = data[1:]
self._udp_data_send_buffer = self._udp_data_send_buffer[
length:]
frag = common.ord(data[2])
if frag != 0:
logging.warn('drop a message since frag is %d' %
(frag, ))
continue
else:
data = data[3:]
header_result = parse_header(data)
if header_result is None:
continue
connecttype, dest_addr, dest_port, header_length = header_result
addrs = socket.getaddrinfo(dest_addr, dest_port, 0,
socket.SOCK_DGRAM,
socket.SOL_UDP)
#logging.info('UDP over TCP sendto %s:%d %d bytes from %s:%d' % (dest_addr, dest_port, len(data), self._client_address[0], self._client_address[1]))
if addrs:
af, socktype, proto, canonname, server_addr = addrs[0]
data = data[header_length:]
if af == socket.AF_INET6:
self._remote_sock_v6.sendto(
data, (server_addr[0], dest_port))
else:
sock.sendto(data, (server_addr[0], dest_port))
except Exception as e:
#trace = traceback.format_exc()
#logging.error(trace)
error_no = eventloop.errno_from_exception(e)
if error_no in (errno.EAGAIN, errno.EINPROGRESS,
errno.EWOULDBLOCK):
uncomplete = True
else:
shell.print_exception(e)
self.destroy()
return False
return True
else:
try:
if self._encrypt_correct:
if sock == self._remote_sock:
self._server.server_transfer_ul += len(data)
self._update_activity(len(data))
if data:
l = len(data)
s = sock.send(data)
if s < l:
data = data[s:]
uncomplete = True
else:
return
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:
#traceback.print_exc()
shell.print_exception(e)
self.destroy()
return False
except Exception as e:
shell.print_exception(e)
self.destroy()
return False
if uncomplete:
if sock == self._local_sock:
self._data_to_write_to_local.append(data)
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:
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 server_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''
if self.decrypt_packet_num == 0:
logging.info('auth_simple: over size')
return b'E'
else:
raise Exception('server_post_decrype data error')
if length > len(self.recv_buf):
break
if (binascii.crc32(self.recv_buf[:length])
& 0xffffffff) != 0xffffffff:
logging.info('auth_simple: crc32 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'
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]
if not self.has_recv_header:
if len(out_buf) < 12:
self.raw_trans = True
self.recv_buf = b''
logging.info('auth_simple: too short')
return b'E'
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((int(time.time()) & 0xffffffff) -
utc_time)
if time_dif < -self.max_time_dif or time_dif > self.max_time_dif \
or common.int32(utc_time - self.server_info.data.startup_time) < 0:
self.raw_trans = True
self.recv_buf = b''
logging.info(
'auth_simple: wrong timestamp, time_dif %d, data %s' %
(
time_dif,
binascii.hexlify(out_buf),
))
return b'E'
elif self.server_info.data.insert(client_id, connection_id):
self.has_recv_header = True
out_buf = out_buf[12:]
self.client_id = client_id
self.connection_id = connection_id
else:
self.raw_trans = True
self.recv_buf = b''
logging.info('auth_simple: auth fail, data %s' %
(binascii.hexlify(out_buf), ))
return b'E'
self.recv_buf = self.recv_buf[length:]
if out_buf:
self.server_info.data.update(self.client_id, self.connection_id)
self.decrypt_packet_num += 1
return out_buf
def _handle_stage_addr(self, ogn_data, data):
try:
if self._is_local:
cmd = common.ord(data[1])
if cmd == CMD_UDP_ASSOCIATE:
logging.debug('UDP associate')
if self._local_sock.family == socket.AF_INET6:
header = b'\x05\x00\x00\x04'
else:
header = b'\x05\x00\x00\x01'
addr, port = self._local_sock.getsockname()[:2]
addr_to_send = socket.inet_pton(self._local_sock.family,
addr)
port_to_send = struct.pack('>H', port)
self._write_to_sock(header + addr_to_send + port_to_send,
self._local_sock)
self._stage = STAGE_UDP_ASSOC
# just wait for the client to disconnect
return
elif cmd == CMD_CONNECT:
# just trim VER CMD RSV
data = data[3:]
else:
logging.error('unknown command %d', cmd)
self.destroy()
return
before_parse_data = data
if self._is_local:
header_result = parse_header(data)
else:
data = pre_parse_header(data)
if data is None:
data = self._handel_protocol_error(self._client_address,
ogn_data)
header_result = parse_header(data)
if header_result is None:
data = self._handel_protocol_error(self._client_address,
ogn_data)
header_result = parse_header(data)
connecttype, remote_addr, remote_port, header_length = header_result
common.connect_log(
'%s connecting %s:%d from %s:%d' %
((connecttype == 0) and 'TCP'
or 'UDP', common.to_str(remote_addr), remote_port,
self._client_address[0], self._client_address[1]))
self._remote_address = (common.to_str(remote_addr), remote_port)
self._remote_udp = (connecttype != 0)
# pause reading
self._update_stream(STREAM_UP, WAIT_STATUS_WRITING)
self._stage = STAGE_DNS
if self._is_local:
# forward address to remote
self._write_to_sock((b'\x05\x00\x00\x01'
b'\x00\x00\x00\x00\x10\x10'),
self._local_sock)
head_len = self._get_head_size(data, 30)
self._obfs.obfs.server_info.head_len = head_len
self._protocol.obfs.server_info.head_len = head_len
if self._encryptor is not None:
data = self._protocol.client_pre_encrypt(data)
data_to_send = self._encryptor.encrypt(data)
data_to_send = self._obfs.client_encode(data_to_send)
if data_to_send:
self._data_to_write_to_remote.append(data_to_send)
# notice here may go into _handle_dns_resolved directly
self._dns_resolver.resolve(self._chosen_server[0],
self._handle_dns_resolved)
else:
if len(data) > header_length:
self._data_to_write_to_remote.append(data[header_length:])
# notice here may go into _handle_dns_resolved directly
self._dns_resolver.resolve(remote_addr,
self._handle_dns_resolved)
except Exception as e:
self._log_error(e)
if self._config['verbose']:
traceback.print_exc()
self.destroy()
def test_table_result():
from shadowsocks.common import ord
target1 = [
[60, 53, 84, 138, 217, 94, 88, 23, 39, 242, 219, 35, 12, 157, 165, 181,
255, 143, 83, 247, 162, 16, 31, 209, 190, 171, 115, 65, 38, 41, 21,
245, 236, 46, 121, 62, 166, 233, 44, 154, 153, 145, 230, 49, 128, 216,
173, 29, 241, 119, 64, 229, 194, 103, 131, 110, 26, 197, 218, 59, 204,
56, 27, 34, 141, 221, 149, 239, 192, 195, 24, 155, 170, 183, 11, 254,
213, 37, 137, 226, 75, 203, 55, 19, 72, 248, 22, 129, 33, 175, 178,
10, 198, 71, 77, 36, 113, 167, 48, 2, 117, 140, 142, 66, 199, 232,
243, 32, 123, 54, 51, 82, 57, 177, 87, 251, 150, 196, 133, 5, 253,
130, 8, 184, 14, 152, 231, 3, 186, 159, 76, 89, 228, 205, 156, 96,
163, 146, 18, 91, 132, 85, 80, 109, 172, 176, 105, 13, 50, 235, 127,
0, 189, 95, 98, 136, 250, 200, 108, 179, 211, 214, 106, 168, 78, 79,
74, 210, 30, 73, 201, 151, 208, 114, 101, 174, 92, 52, 120, 240, 15,
169, 220, 182, 81, 224, 43, 185, 40, 99, 180, 17, 212, 158, 42, 90, 9,
191, 45, 6, 25, 4, 222, 67, 126, 1, 116, 124, 206, 69, 61, 7, 68, 97,
202, 63, 244, 20, 28, 58, 93, 134, 104, 144, 227, 147, 102, 118, 135,
148, 47, 238, 86, 112, 122, 70, 107, 215, 100, 139, 223, 225, 164,
237, 111, 125, 207, 160, 187, 246, 234, 161, 188, 193, 249, 252],
[151, 205, 99, 127, 201, 119, 199, 211, 122, 196, 91, 74, 12, 147, 124,
180, 21, 191, 138, 83, 217, 30, 86, 7, 70, 200, 56, 62, 218, 47, 168,
22, 107, 88, 63, 11, 95, 77, 28, 8, 188, 29, 194, 186, 38, 198, 33,
230, 98, 43, 148, 110, 177, 1, 109, 82, 61, 112, 219, 59, 0, 210, 35,
215, 50, 27, 103, 203, 212, 209, 235, 93, 84, 169, 166, 80, 130, 94,
164, 165, 142, 184, 111, 18, 2, 141, 232, 114, 6, 131, 195, 139, 176,
220, 5, 153, 135, 213, 154, 189, 238, 174, 226, 53, 222, 146, 162,
236, 158, 143, 55, 244, 233, 96, 173, 26, 206, 100, 227, 49, 178, 34,
234, 108, 207, 245, 204, 150, 44, 87, 121, 54, 140, 118, 221, 228,
155, 78, 3, 239, 101, 64, 102, 17, 223, 41, 137, 225, 229, 66, 116,
171, 125, 40, 39, 71, 134, 13, 193, 129, 247, 251, 20, 136, 242, 14,
36, 97, 163, 181, 72, 25, 144, 46, 175, 89, 145, 113, 90, 159, 190,
15, 183, 73, 123, 187, 128, 248, 252, 152, 24, 197, 68, 253, 52, 69,
117, 57, 92, 104, 157, 170, 214, 81, 60, 133, 208, 246, 172, 23, 167,
160, 192, 76, 161, 237, 45, 4, 58, 10, 182, 65, 202, 240, 185, 241,
79, 224, 132, 51, 42, 126, 105, 37, 250, 149, 32, 243, 231, 67, 179,
48, 9, 106, 216, 31, 249, 19, 85, 254, 156, 115, 255, 120, 75, 16]]
target2 = [
[124, 30, 170, 247, 27, 127, 224, 59, 13, 22, 196, 76, 72, 154, 32,
209, 4, 2, 131, 62, 101, 51, 230, 9, 166, 11, 99, 80, 208, 112, 36,
248, 81, 102, 130, 88, 218, 38, 168, 15, 241, 228, 167, 117, 158, 41,
10, 180, 194, 50, 204, 243, 246, 251, 29, 198, 219, 210, 195, 21, 54,
91, 203, 221, 70, 57, 183, 17, 147, 49, 133, 65, 77, 55, 202, 122,
162, 169, 188, 200, 190, 125, 63, 244, 96, 31, 107, 106, 74, 143, 116,
148, 78, 46, 1, 137, 150, 110, 181, 56, 95, 139, 58, 3, 231, 66, 165,
142, 242, 43, 192, 157, 89, 175, 109, 220, 128, 0, 178, 42, 255, 20,
214, 185, 83, 160, 253, 7, 23, 92, 111, 153, 26, 226, 33, 176, 144,
18, 216, 212, 28, 151, 71, 206, 222, 182, 8, 174, 205, 201, 152, 240,
155, 108, 223, 104, 239, 98, 164, 211, 184, 34, 193, 14, 114, 187, 40,
254, 12, 67, 93, 217, 6, 94, 16, 19, 82, 86, 245, 24, 197, 134, 132,
138, 229, 121, 5, 235, 238, 85, 47, 103, 113, 179, 69, 250, 45, 135,
156, 25, 61, 75, 44, 146, 189, 84, 207, 172, 119, 53, 123, 186, 120,
171, 68, 227, 145, 136, 100, 90, 48, 79, 159, 149, 39, 213, 236, 126,
52, 60, 225, 199, 105, 73, 233, 252, 118, 215, 35, 115, 64, 37, 97,
129, 161, 177, 87, 237, 141, 173, 191, 163, 140, 234, 232, 249],
[117, 94, 17, 103, 16, 186, 172, 127, 146, 23, 46, 25, 168, 8, 163, 39,
174, 67, 137, 175, 121, 59, 9, 128, 179, 199, 132, 4, 140, 54, 1, 85,
14, 134, 161, 238, 30, 241, 37, 224, 166, 45, 119, 109, 202, 196, 93,
190, 220, 69, 49, 21, 228, 209, 60, 73, 99, 65, 102, 7, 229, 200, 19,
82, 240, 71, 105, 169, 214, 194, 64, 142, 12, 233, 88, 201, 11, 72,
92, 221, 27, 32, 176, 124, 205, 189, 177, 246, 35, 112, 219, 61, 129,
170, 173, 100, 84, 242, 157, 26, 218, 20, 33, 191, 155, 232, 87, 86,
153, 114, 97, 130, 29, 192, 164, 239, 90, 43, 236, 208, 212, 185, 75,
210, 0, 81, 227, 5, 116, 243, 34, 18, 182, 70, 181, 197, 217, 95, 183,
101, 252, 248, 107, 89, 136, 216, 203, 68, 91, 223, 96, 141, 150, 131,
13, 152, 198, 111, 44, 222, 125, 244, 76, 251, 158, 106, 24, 42, 38,
77, 2, 213, 207, 249, 147, 113, 135, 245, 118, 193, 47, 98, 145, 66,
160, 123, 211, 165, 78, 204, 80, 250, 110, 162, 48, 58, 10, 180, 55,
231, 79, 149, 74, 62, 50, 148, 143, 206, 28, 15, 57, 159, 139, 225,
122, 237, 138, 171, 36, 56, 115, 63, 144, 154, 6, 230, 133, 215, 41,
184, 22, 104, 254, 234, 253, 187, 226, 247, 188, 156, 151, 40, 108,
51, 83, 178, 52, 3, 31, 255, 195, 53, 235, 126, 167, 120]]
encrypt_table = b''.join(get_table(b'foobar!'))
decrypt_table = maketrans(encrypt_table, maketrans(b'', b''))
for i in range(0, 256):
assert (target1[0][i] == ord(encrypt_table[i]))
assert (target1[1][i] == ord(decrypt_table[i]))
encrypt_table = b''.join(get_table(b'barfoo!'))
decrypt_table = maketrans(encrypt_table, maketrans(b'', b''))
for i in range(0, 256):
assert (target2[0][i] == ord(encrypt_table[i]))
assert (target2[1][i] == ord(decrypt_table[i]))
def _handle_stage_addr(self, data):
try:
addr, port = self._local_sock.getpeername()[:2]
if self._is_local:
cmd = common.ord(data[1])
if cmd == CMD_UDP_ASSOCIATE:
logging.debug('U[%d] UDP associate' %
self._config['server_port'])
if self._local_sock.family == socket.AF_INET6:
header = b'\x05\x00\x00\x04'
else:
header = b'\x05\x00\x00\x01'
# TODO: inet_pton is added for windows in Py 3.4
addr_to_send = socket.inet_pton(self._local_sock.family,
addr)
port_to_send = struct.pack('>H', port)
self._write_to_sock(header + addr_to_send + port_to_send,
self._local_sock)
self._stage = STAGE_UDP_ASSOC
# just wait for the client to disconnect
return
elif cmd == CMD_CONNECT:
# just trim VER CMD RSV
data = data[3:]
else:
logging.error('U[%d] Unknown command %d',
self._config['server_port'], cmd)
self.destroy()
return
header_result = parse_header(data)
if header_result is None:
raise Exception('TCP Can not parse header')
addrtype, remote_addr, remote_port, header_length = header_result
if self._config['firewall_ports'] and self._config[
'server_port'] not in self._config['firewall_trusted']:
# Firewall enabled
if self._config[
'firewall_mode'] == 'blacklist' and remote_port in self._config[
'firewall_ports']:
firewall_blocked = True
elif self._config[
'firewall_mode'] == 'whitelist' and remote_port not in self._config[
'firewall_ports']:
firewall_blocked = True
else:
firewall_blocked = False
else:
firewall_blocked = False
if firewall_blocked:
logging.warning('U[%d] TCP PORT BANNED: RP[%d] A[%s-->%s]' %
(self._config['server_port'], remote_port,
addr, common.to_str(remote_addr)))
return
else:
logging.info('U[%d] TCP CONN: RP[%d] A[%s-->%s]' %
(self._config['server_port'], remote_port, addr,
common.to_str(remote_addr)))
self._remote_address = (common.to_str(remote_addr), remote_port)
# pause reading
self._update_stream(STREAM_UP, WAIT_STATUS_WRITING)
self._stage = STAGE_DNS
if self._is_local:
# forward address to remote
self._write_to_sock((b'\x05\x00\x00\x01'
b'\x00\x00\x00\x00\x10\x10'),
self._local_sock)
key = self._cryptor.cipher_iv + self._cryptor.key
data_to_send = self._cryptor.encrypt(data)
self._data_to_write_to_remote.append(data_to_send)
# notice here may go into _handle_dns_resolved directly
self._dns_resolver.resolve(self._chosen_server[0],
self._handle_dns_resolved)
else:
if len(data) > header_length:
self._data_to_write_to_remote.append(data[header_length:])
# notice here may go into _handle_dns_resolved directly
self._dns_resolver.resolve(remote_addr,
self._handle_dns_resolved)
except Exception as e:
self._log_error(e)
if self._config['verbose']:
traceback.print_exc()
self.destroy()
def _handle_server(self):
server = self._server_socket
# receive request
# note that no listen()/accept() is used as TCP
# this is because udp doesn't require long-lived connection
# so the server does not need to listen for and accept connections
# It only needs to use bind() to associate its socket with a port
# and then wait for individual messages
# _server_socket has been bound in __init__()
data, r_addr = server.recvfrom(BUF_SIZE)
if not data:
logging.debug('UDP handle_server: data is empty')
if self._stat_callback:
self._stat_callback(self._listen_port, len(data))
# for a local server, request is from local client
# if the datagram isnot standalone, drop it
if self._is_local:
frag = common.ord(data[2])
# FRAG Current fragment number
# ord() converts it back to number
# The FRAG field indicates whether or not this datagram is one of a number of fragments.
# Implementation of fragmentation is optional; an implementation that
# does not support fragmentation MUST drop any datagram whose FRAG field is other than X'00'.
if frag != 0:
logging.warn('drop a message since frag is not 0')
return
else:
data = data[3:]
# for a remote server, request is from local server
# decrypt it
# note that no removal of first 3 bytes canbe found here, guess in decryption?
else:
data = encrypt.encrypt_all(self._password, self._method, 0, data)
# decrypt data
if not data:
logging.debug('UDP handle_server: data is empty after decrypt')
return
# for both local and remote server, analyse request header
header_result = parse_header(data)
if header_result is None:
return
addrtype, dest_addr, dest_port, header_length = header_result
# set a place where a server relays request to
# a local server relays request to remote server
if self._is_local:
server_addr, server_port = self._get_a_server()
# a remote server relays request to dest, extracted from request header
else:
server_addr, server_port = dest_addr, dest_port
# try to find send-socket from cache
addrs = self._dns_cache.get(server_addr, None)
if addrs is None:
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs:
# drop
return
else:
self._dns_cache[server_addr] = addrs
af, socktype, proto, canonname, sa = addrs[0]
key = client_key(r_addr, af)
client = self._cache.get(key, None)
# if not found in the cache, init a new send-socket
# add it to the eventloop
if not client:
# TODO async getaddrinfo
if self._forbidden_iplist:
if common.to_str(sa[0]) in self._forbidden_iplist:
logging.debug('IP %s is in forbidden list, drop' %
common.to_str(sa[0]))
# drop
return
client = socket.socket(af, socktype, proto)
client.setblocking(False)
self._cache[key] = client
self._client_fd_to_server_addr[client.fileno()] = r_addr
self._sockets.add(client.fileno())
self._eventloop.add(client, eventloop.POLL_IN, self)
# process the request before relay
# a local server relays request to remote server
# so request should be encrypted
if self._is_local:
data = encrypt.encrypt_all(self._password, self._method, 1, data)
if not data:
return
# a remote server relays request to dest
# note that request has been decrypted before
# so just relays it
# note that udp request header is removed
else:
data = data[header_length:]
if not data:
return
# relay the request using send-socket
try:
client.sendto(data, (server_addr, server_port))
except IOError as e:
err = eventloop.errno_from_exception(e)
if err in (errno.EINPROGRESS, errno.EAGAIN):
pass
else:
shell.print_exception(e)
def _handle_stage_addr(self, data):
try:
addr, port = self._local_sock.getpeername()[:2]
if self._is_local:
cmd = common.ord(data[1])
if cmd == CMD_UDP_ASSOCIATE:
logging.debug('U[%d] UDP associate' %
self._config['server_port'])
if self._local_sock.family == socket.AF_INET6:
header = b'\x05\x00\x00\x04'
else:
header = b'\x05\x00\x00\x01'
# TODO: inet_pton is added for windows in Py 3.4
addr_to_send = socket.inet_pton(self._local_sock.family,
addr)
port_to_send = struct.pack('>H', port)
self._write_to_sock(header + addr_to_send + port_to_send,
self._local_sock)
self._stage = STAGE_UDP_ASSOC
# just wait for the client to disconnect
return
elif cmd == CMD_CONNECT:
# just trim VER CMD RSV
data = data[3:]
else:
logging.error('U[%d] Unknown command %d',
self._config['server_port'], cmd)
self.destroy()
return
header_result = parse_header(data)
if header_result is None:
raise Exception('TCP Can not parse header')
addrtype, remote_addr, remote_port, header_length = header_result
if self._config['firewall_ports'] and self._config[
'server_port'] not in self._config['firewall_trusted']:
# Firewall enabled
if self._config[
'firewall_mode'] == 'blacklist' and remote_port in self._config[
'firewall_ports']:
firewall_blocked = True
elif self._config[
'firewall_mode'] == 'whitelist' and remote_port not in self._config[
'firewall_ports']:
firewall_blocked = True
else:
firewall_blocked = False
else:
firewall_blocked = False
if firewall_blocked:
logging.warning('U[%d] TCP PORT BANNED: RP[%d] A[%s-->%s]' %
(self._config['server_port'], remote_port,
addr, common.to_str(remote_addr)))
return
key = self._cryptor.decipher_iv + self._cryptor.key
else:
logging.info('U[%d] TCP CONN: RP[%d] A[%s-->%s]' %
(self._config['server_port'], remote_port, addr,
common.to_str(remote_addr)))
if self._is_local is False:
# spec https://shadowsocks.org/en/spec/one-time-auth.html
self._ota_enable_session = addrtype & ADDRTYPE_AUTH
if self._ota_enable or (addrtype & ADDRTYPE_AUTH
== ADDRTYPE_AUTH):
if not self._ota_enable and self._config['verbose']:
logging.info(
'U[%d] TCP one time auth automatically enabled' %
self._config['server_port'])
self._ota_enable = True
if len(data) < header_length + ONETIMEAUTH_BYTES:
logging.warn(
'U[%d] One time auth header is too short' %
self._config['server_port'])
return None
offset = header_length + ONETIMEAUTH_BYTES
_hash = data[header_length:offset]
_data = data[:header_length]
key = self._cryptor.decipher_iv + self._cryptor.key
if onetimeauth_verify(_hash, _data, key) is False:
logging.warn('U[%d] One time auth fail' %
self._config['server_port'])
self.destroy()
header_length += ONETIMEAUTH_BYTES
self._remote_address = (common.to_str(remote_addr), remote_port)
# pause reading
self._update_stream(STREAM_UP, WAIT_STATUS_WRITING)
self._stage = STAGE_DNS
if self._is_local:
# forward address to remote
self._write_to_sock((b'\x05\x00\x00\x01'
b'\x00\x00\x00\x00\x10\x10'),
self._local_sock)
key = self._cryptor.cipher_iv + self._cryptor.key
# spec https://shadowsocks.org/en/spec/one-time-auth.html
# ATYP & 0x10 == 0x10, then OTA is enabled.
if self._ota_enable:
data = common.chr(addrtype | ADDRTYPE_AUTH) + data[1:]
key = self._cryptor.cipher_iv + self._cryptor.key
data += onetimeauth_gen(data, key)
data_to_send = self._cryptor.encrypt(data)
self._data_to_write_to_remote.append(data_to_send)
# notice here may go into _handle_dns_resolved directly
self._dns_resolver.resolve(self._chosen_server[0],
self._handle_dns_resolved)
else:
if self._ota_enable:
data = data[header_length:]
self._ota_chunk_data(data,
self._data_to_write_to_remote.append)
elif len(data) > header_length:
self._data_to_write_to_remote.append(data[header_length:])
# notice here may go into _handle_dns_resolved directly
self._dns_resolver.resolve(remote_addr,
self._handle_dns_resolved)
except Exception as e:
self._log_error(e)
if self._config['verbose']:
traceback.print_exc()
self.destroy()