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 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 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')
if hmac.new(self.server_info.key + self.server_info.data.client_id,
buf[:-10], hashlib.sha1).digest()[:10] != buf[-10:]:
raise Exception('client_decode data error')
return (b'', True)
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 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 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 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 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 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 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 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 client_post_decrypt(self, buf):
if self.raw_trans:
return buf
self.recv_buf += buf
out_buf = b''
while len(self.recv_buf) > 4:
crc = struct.pack('<H', binascii.crc32(self.recv_buf[:2]) & 0xFFFF)
if crc != self.recv_buf[2:4]:
raise Exception('client_post_decrypt data uncorrect crc')
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[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 out_buf:
self.decrypt_packet_num += 1
return out_buf
def test_table_result():
from app.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 test_table_result():
from app.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 server_decode(self, buf):
if self.handshake_status == -1:
return (buf, True, False)
if (self.handshake_status & 4) == 4:
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 & 1) == 1:
self.recv_buffer += buf
buf = self.recv_buffer
verify = buf
if len(buf) < 11:
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"): #Finished
raise Exception('server_decode data error')
verify_len = struct.unpack('>H', buf[3:5])[0] + 1 # 11 - 10
if len(verify) < verify_len + 10:
return (b'', False, False)
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')
self.recv_buffer = verify[verify_len + 10:]
status = self.handshake_status
self.handshake_status |= 4
ret = self.server_decode(b'')
return ret
#raise Exception("handshake data = %s" % (binascii.hexlify(buf)))
self.recv_buffer += buf
buf = self.recv_buffer
ogn_buf = buf
if len(buf) < 3:
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.handshake_status = 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
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
if len(self.recv_buffer) >= 11:
ret = self.server_decode(b'')
return (ret[0], True, True)
# (buffer_to_recv, is_need_decrypt, is_need_to_encode_and_send_back)
return (b'', False, True)
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_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
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.server_info.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.server_info.data.update(self.user_id, self.client_id,
self.connection_id)
return (out_buf, sendback)
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_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)