/
sni_mask.py
452 lines (400 loc) · 17.2 KB
/
sni_mask.py
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from __future__ import with_statement
import sys
import socket
import select, threading
import SocketServer
import struct, random, time
import logging
INTERFACE = ('0.0.0.0', 443)
WAN = []
KEEPALIVE = True
HOSTS = {
'.wikipedia.org' : (0, 1, 12, 0, [], ['198.35.26.96']),
'.m.wikipedia.org' : (0, 1, 12, 0, [], ['198.35.26.96']),
'SNI' : (0, 1, 12, 0, [], ['69.162.113.194']),
'*' : 'SNI'
}
class ThreadingTCPServer(SocketServer.ThreadingMixIn, SocketServer.TCPServer):
allow_reuse_address = True
def carry_around_add(a, b):
c = a + b
return (c & 0xffff) + (c >> 16)
def checksum(msg):
if len(msg) % 2 != 0:
msg += '\0'
s = 0
for i in range(0, len(msg), 2):
w = (ord(msg[i]) << 8 ) + ord(msg[i+1])
s = carry_around_add(s, w)
return ~s & 0xffff
def move_https(sock, data):
if data == '':
sock.close()
return True
elif data[0] == '\x16':
return False
else:
head = data.split('\r\n')
method, res, ver = head[0].split(' ', 2)
if method in ['GET', 'POST', 'HEAD']:
host = head[1][6:]
content = 'HTTP/1.1 301 Moved Permanently\r\nLocation: https://%s%s\r\n\r\n' % (host, res)
sock.send(content)
sock.close()
return True
def http_filter(data):
if data.find(' HTTP/1.1\r\n') == -1:
return data
request = ''
for line in data.split('\r\n'):
if line[:9] == 'Referer: ':
pass
elif line[:17] == 'Accept-Language: ':
request += 'Accept-Language: en\r\n'
elif line == 'Connection: keep-alive\r\n':
pass
elif line[:8] == 'Cookie: ':
pass
elif line[:12] == 'User-Agent: ':
if line.find('Mobile') != -1:
request += 'User-Agent: Mozilla/5.0 (Android 6.0; Mobile; rv:58.0) Gecko/58.0 Firefox/58.0\r\n'
#request += 'User-Agent: Mozilla/5.0 (iPod; CPU iPhone OS 12_0 like macOS) AppleWebKit/602.1.50 (KHTML, like Gecko) Version/12.0 Mobile/14A5335d Safari/602.1.50\r\n'
elif line.find('Table') != -1:
request += 'User-Agent: Mozilla/5.0 (Android 6.0; Table; rv:58.0) Gecko/58.0 Firefox/58.0\r\n'
else:
request += 'User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0\r\n'
elif line != '':
request += line + '\r\n'
return request + '\r\n'
#return request.replace('\r\n', '\n') + '\n'
class SNIProxy(SocketServer.StreamRequestHandler):
remote = 0
def parse(self, data):
try:
offset = 0
ContentType, Version, Length = struct.unpack('!BHH', data[:5])
offset += 5
if ContentType != 22:
return ''
HandshakeType, HandshakeLength, HandshakeVersion = struct.unpack('!BxHH', data[offset:offset+6])
offset += 6
if HandshakeType != 1:
return ''
Random, SessionIDLength = struct.unpack('!32sB', data[offset:offset+33])
offset += 33 + SessionIDLength
CipherSuitersLength = struct.unpack('!H', data[offset:offset+2])[0]
offset += 2 + CipherSuitersLength
CompressionMethodsLenght = ord(data[offset])
offset += 1 + CompressionMethodsLenght
ExtensionsLength = struct.unpack('!H', data[offset:offset+2])[0]
offset += 2
ExtensionsEnd = offset + ExtensionsLength
while offset < ExtensionsEnd:
ExtensionType, ExtensionLength = struct.unpack('!HH', data[offset:offset+4])
offset += 4
if ExtensionType == 0:
ServerNameListLength = struct.unpack('!H', data[offset:offset+2])
offset += 2
ServerNameType, ServerNameLength = struct.unpack('!BH', data[offset:offset+3])
offset += 3
return data[offset:offset+ServerNameLength]
else:
offset += ExtensionLength
return ''
except:
return ''
def parse_http(self, data):
if data[:4] in ['GET ', 'POST', 'HEAD']:
head = data.split('\r\n')
#method, res, ver = head[0].split(' ', 2)
return head[1][6:]
else:
return ''
def forward(self, sock, remote):
try:
fdset = [sock, remote]
while True:
r, w, e = select.select(fdset, [], [])
if sock in r:
data = sock.recv(32768)
if len(data) <= 0:
break
remote.sendall(data)
if remote in r:
data = remote.recv(32768)
if len(data) <= 0:
break
sock.sendall(data)
except socket.error, e:
logging.warn('Forward: %s' % e)
finally:
sock.close()
remote.close()
def sendall(self, remote, s_send, ttl, aseq, seq, data, fakedata):
sockname = remote.getsockname()
addr = remote.getpeername()
ip_sock = socket.inet_aton(sockname[0])
ip_addr = socket.inet_aton(addr[0])
ip_header = struct.pack('!BBHHHBBH4s4s' , 69, 0, 0, 47843, 16384, ttl, 6, 0, ip_sock, ip_addr)
psh = struct.pack(b'!4s4sBBH', ip_sock, ip_addr, 0, socket.IPPROTO_TCP, 20 + len(fakedata))
if ttl == 1:
tcp_header = struct.pack(b'!HHLLBBHHH', sockname[1], addr[1], aseq, seq+1, 80, 24, 454, 0, 0)
packet = ip_header + tcp_header + fakedata
s_send.sendto(packet, (addr[0], 0))
remote.sendall(data)
s_send.sendto(packet, (addr[0], 0))
elif ttl == 2:
tcp_header = struct.pack(b'!HHLLBBHHH', sockname[1], addr[1], aseq, seq, 80, 24, 454, 0, 0)
tcp_packet = tcp_header + fakedata
tcp_checksum = checksum(psh + tcp_packet)
tcp_header = struct.pack(b'!16sH2s', tcp_header[:16], tcp_checksum, tcp_header[18:])
packet = ip_header + tcp_header + fakedata
s_send.sendto(packet, (addr[0], 0))
remote.sendall(data)
s_send.sendto(packet, (addr[0], 0))
else:
tcp_header = struct.pack(b'!HHLLBBHHH', sockname[1], addr[1], aseq, seq+1, 80, 24, 454, 0, 0)
tcp_packet = tcp_header + fakedata
tcp_checksum = checksum(psh + tcp_packet)
tcp_header = struct.pack(b'!16sH2s', tcp_header[:16], tcp_checksum, tcp_header[18:])
packet = ip_header + tcp_header + fakedata
s_send.sendto(packet, (addr[0], 0))
remote.sendall(data)
s_send.sendto(packet, (addr[0], 0))
def connect(self, addr, data, sni, ttl, mss, keep, event_connected, event_ready, mutex):
global WAN
sock = self.connection
try:
isIPv6 = addr[0].find(':') != -1
if isIPv6:
remote = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
else:
remote = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
if WAN != []:
wan = random.choice(WAN)
remote.bind((wan, 0))
if mss > 0:
remote.setsockopt(socket.SOL_TCP, socket.TCP_MAXSEG, mss)
remote.settimeout(3.0)
s_recv_tcp = None
seq = 0
aseq = 0
if ttl > 0:
if isIPv6:
s_recv_tcp = socket.socket(socket.AF_INET6, socket.SOCK_RAW, socket.IPPROTO_TCP)
else:
s_recv_tcp = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_TCP)
s_recv_tcp.connect(addr)
remote.connect(addr)
remote.settimeout(None)
if mutex.acquire(2):
if event_connected.isSet() == False:
event_connected.set()
else:
mutex.release()
s_recv_tcp.close()
remote.close()
return
else:
s_recv_tcp.close()
remote.close()
return
while not event_ready.isSet():
packet = s_recv_tcp.recv(2048)
if isIPv6:
tcp_header = packet[:20]
else:
tcp_header = packet[20:40]
tcph = struct.unpack(b'!HHIIBBHHH', tcp_header)
sport, dport, seq, aseq, headlen, flags, win, chechsum, p = tcph
if dport == remote.getsockname()[1]:
break
s_recv_tcp.close()
s_send = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_RAW)
if keep:
data = http_filter(data)
fakedata = ' ' * len(data)
else:
fakedata = ' ' * len(data)
remote.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
offset = data.find(sni) + len(sni) / 2
self.sendall(remote, s_send, ttl, aseq, seq, data[:offset], fakedata)
if event_ready.isSet():
s_send.close()
remote.close()
return
remote.sendall(data[offset:])
if keep:
rstword = ''
try:
aseq += len(data)
fdset = [sock, remote]
while True:
r, w, e = select.select(fdset, [], [])
if sock in r:
data = sock.recv(32768)
if len(data) <= 0:
break
data = http_filter(data)
#print repr(data)
fakedata = data.replace(sni, fakesni)
offset = data.find(sni) + len(sni) / 2
self.sendall(remote, s_send, ttl, aseq, seq, data[:offset], fakedata)
remote.sendall(data[offset:])
#rstword = data
aseq += len(data)
if remote in r:
data = remote.recv(32768)
if len(data) <= 0:
break
seq += len(data)
sock.sendall(data)
except socket.error, e:
logging.warn('Forward: %s %s' % (e, sni))
#print repr(rstword)
finally:
sock.close()
remote.close()
s_send.close()
else:
remote.connect(addr)
if mutex.acquire(2):
if self.remote:
mutex.release()
remote.close()
return
event_connected.set()
else:
remote.close()
return
self.remote = remote
remote.settimeout(None)
remote.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
remote.sendall(data)
if keep:
self.forward(sock, remote)
self.remote = remote
mutex.release()
event_ready.set()
except socket.error, e:
logging.warn(sni + ' ' + str(e))
return
def handle_remote(self, rule, port, server_name, data, keep):
try:
event_connected = threading.Event()
event_ready = threading.Event()
round_count, waittime, ttl, mss, goodlist, addrlist = rule
if round_count > 0:
random.shuffle(goodlist)
random.shuffle(addrlist)
else:
round_count = 1
mutex = threading.Lock()
count = len(goodlist)
for i in xrange(count):
addr = (goodlist[i], port)
c = threading.Thread(target=self.connect, args=(addr, data, server_name, ttl, mss, keep, event_connected, event_ready, mutex,), name="connect")
c.start()
if i < count-1:
if event_connected.wait(timeout=waittime):
break
else:
event_connected.wait(timeout=2.0)
if self.remote == False:
goodlist = []
for r in xrange(round_count):
count = len(addrlist)
for i in xrange(count):
addr = (addrlist[i], port)
c = threading.Thread(target=self.connect, args=(addr, data, server_name, ttl, mss, keep, event_connected, event_ready, mutex,), name="connect")
c.start()
if i < count-1:
if event_connected.wait(timeout=waittime):
break
else:
event_connected.wait()
if self.remote:
goodlist.append(self.remote.getpeername()[0])
break
event_ready.wait()
return self.remote
except socket.error, e:
logging.warn(server_name + ' ' + str(e))
return 0
def handle(self):
global HOSTS
server_name = ''
try:
sock = self.connection
sock.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
data = sock.recv(2048)
server_name = self.parse_http(data)
if server_name == '':
server_name = self.parse(data)
https = True
port = 443
else:
https = False
port = 80
remote = 0
root_name = server_name[server_name.find('.'):]
if HOSTS.has_key(server_name):
rule = HOSTS[server_name]
else:
if HOSTS.has_key(root_name):
rule = HOSTS[root_name]
else:
if HOSTS.has_key('*'):
if move_https(sock, data):
return
rule = HOSTS['*']
else:
rule = None
if rule:
if isinstance(rule, str):
rule = HOSTS[rule]
round_count, waittime, ttl, mss, goodlist, addrlist = rule
if https:
remote = self.handle_remote(rule, port, server_name, data, False)
if remote:
global KEEPALIVE
if KEEPALIVE:
remote.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
remote.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, 1)
remote.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, 1)
remote.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, 3)
logging.info('%s->https://%s %s' % (self.client_address[0], server_name, remote.getpeername()[0]))
self.forward(sock, remote)
else:
logging.info('%s->%s fail' % (self.client_address[0], server_name))
sock.close()
else:
logging.info('%s->http://%s' % (self.client_address[0], server_name))
self.handle_remote(rule, port, server_name, data, True)
else:
logging.info('%s->%s %s' % (self.client_address[0], server_name, 'Unknow'))
sock.close()
return
except socket.error, e:
logging.warn(server_name + ' ' + str(e))
sock.close()
def main():
global PORT, LOCAL, IPv6
logging.basicConfig(level=logging.DEBUG,
format='%(asctime)s %(levelname)-8s %(message)s',
datefmt='%Y-%m-%d %H:%M:%S', filemode='a+')
IPv6 = False
global INTERFACE
try:
if IPv6:
ThreadingTCPServer.address_family = socket.AF_INET6
server = ThreadingTCPServer(INTERFACE, SNIProxy)
logging.info("starting local at %s:%d" % tuple(server.server_address[:2]))
server.serve_forever()
except socket.error, e:
logging.error(e)
except KeyboardInterrupt:
server.shutdown()
sys.exit(0)
if __name__ == '__main__':
main()