├── LICENSE ├── README.md └── sni_mask.py /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. 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Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # SNI-Mask 2 | A proxy server use invalid fake packets to make firewall ignore the Server Name Indication 3 | -------------------------------------------------------------------------------- /sni_mask.py: -------------------------------------------------------------------------------- 1 | from __future__ import with_statement 2 | import sys 3 | import socket 4 | import select, threading 5 | import SocketServer 6 | import struct, random, time 7 | import logging 8 | 9 | INTERFACE = ('0.0.0.0', 443) 10 | WAN = [] 11 | KEEPALIVE = True 12 | 13 | HOSTS = { 14 | '.wikipedia.org' : (0, 1, 12, 0, [], ['198.35.26.96']), 15 | '.m.wikipedia.org' : (0, 1, 12, 0, [], ['198.35.26.96']), 16 | 'SNI' : (0, 1, 12, 0, [], ['69.162.113.194']), 17 | '*' : 'SNI' 18 | } 19 | 20 | class ThreadingTCPServer(SocketServer.ThreadingMixIn, SocketServer.TCPServer): 21 | allow_reuse_address = True 22 | 23 | def carry_around_add(a, b): 24 | c = a + b 25 | return (c & 0xffff) + (c >> 16) 26 | 27 | def checksum(msg): 28 | if len(msg) % 2 != 0: 29 | msg += '\0' 30 | s = 0 31 | for i in range(0, len(msg), 2): 32 | w = (ord(msg[i]) << 8 ) + ord(msg[i+1]) 33 | s = carry_around_add(s, w) 34 | return ~s & 0xffff 35 | 36 | def move_https(sock, data): 37 | if data == '': 38 | sock.close() 39 | return True 40 | elif data[0] == '\x16': 41 | return False 42 | else: 43 | head = data.split('\r\n') 44 | method, res, ver = head[0].split(' ', 2) 45 | if method in ['GET', 'POST', 'HEAD']: 46 | host = head[1][6:] 47 | content = 'HTTP/1.1 301 Moved Permanently\r\nLocation: https://%s%s\r\n\r\n' % (host, res) 48 | sock.send(content) 49 | sock.close() 50 | return True 51 | 52 | def http_filter(data): 53 | if data.find(' HTTP/1.1\r\n') == -1: 54 | return data 55 | request = '' 56 | for line in data.split('\r\n'): 57 | if line[:9] == 'Referer: ': 58 | pass 59 | elif line[:17] == 'Accept-Language: ': 60 | request += 'Accept-Language: en\r\n' 61 | elif line == 'Connection: keep-alive\r\n': 62 | pass 63 | elif line[:8] == 'Cookie: ': 64 | pass 65 | elif line[:12] == 'User-Agent: ': 66 | if line.find('Mobile') != -1: 67 | request += 'User-Agent: Mozilla/5.0 (Android 6.0; Mobile; rv:58.0) Gecko/58.0 Firefox/58.0\r\n' 68 | #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' 69 | elif line.find('Table') != -1: 70 | request += 'User-Agent: Mozilla/5.0 (Android 6.0; Table; rv:58.0) Gecko/58.0 Firefox/58.0\r\n' 71 | else: 72 | request += 'User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0\r\n' 73 | elif line != '': 74 | request += line + '\r\n' 75 | return request + '\r\n' 76 | #return request.replace('\r\n', '\n') + '\n' 77 | 78 | class SNIProxy(SocketServer.StreamRequestHandler): 79 | remote = 0 80 | 81 | def parse(self, data): 82 | try: 83 | offset = 0 84 | ContentType, Version, Length = struct.unpack('!BHH', data[:5]) 85 | offset += 5 86 | if ContentType != 22: 87 | return '' 88 | HandshakeType, HandshakeLength, HandshakeVersion = struct.unpack('!BxHH', data[offset:offset+6]) 89 | offset += 6 90 | if HandshakeType != 1: 91 | return '' 92 | Random, SessionIDLength = struct.unpack('!32sB', data[offset:offset+33]) 93 | offset += 33 + SessionIDLength 94 | CipherSuitersLength = struct.unpack('!H', data[offset:offset+2])[0] 95 | offset += 2 + CipherSuitersLength 96 | CompressionMethodsLenght = ord(data[offset]) 97 | offset += 1 + CompressionMethodsLenght 98 | ExtensionsLength = struct.unpack('!H', data[offset:offset+2])[0] 99 | offset += 2 100 | ExtensionsEnd = offset + ExtensionsLength 101 | while offset < ExtensionsEnd: 102 | ExtensionType, ExtensionLength = struct.unpack('!HH', data[offset:offset+4]) 103 | offset += 4 104 | if ExtensionType == 0: 105 | ServerNameListLength = struct.unpack('!H', data[offset:offset+2]) 106 | offset += 2 107 | ServerNameType, ServerNameLength = struct.unpack('!BH', data[offset:offset+3]) 108 | offset += 3 109 | return data[offset:offset+ServerNameLength] 110 | else: 111 | offset += ExtensionLength 112 | 113 | return '' 114 | except: 115 | return '' 116 | 117 | def parse_http(self, data): 118 | if data[:4] in ['GET ', 'POST', 'HEAD']: 119 | head = data.split('\r\n') 120 | #method, res, ver = head[0].split(' ', 2) 121 | return head[1][6:] 122 | else: 123 | return '' 124 | 125 | def forward(self, sock, remote): 126 | try: 127 | fdset = [sock, remote] 128 | while True: 129 | r, w, e = select.select(fdset, [], []) 130 | if sock in r: 131 | data = sock.recv(32768) 132 | if len(data) <= 0: 133 | break 134 | remote.sendall(data) 135 | 136 | if remote in r: 137 | data = remote.recv(32768) 138 | if len(data) <= 0: 139 | break 140 | sock.sendall(data) 141 | except socket.error, e: 142 | logging.warn('Forward: %s' % e) 143 | finally: 144 | sock.close() 145 | remote.close() 146 | 147 | def sendall(self, remote, s_send, ttl, aseq, seq, data, fakedata): 148 | sockname = remote.getsockname() 149 | addr = remote.getpeername() 150 | 151 | ip_sock = socket.inet_aton(sockname[0]) 152 | ip_addr = socket.inet_aton(addr[0]) 153 | 154 | ip_header = struct.pack('!BBHHHBBH4s4s' , 69, 0, 0, 47843, 16384, ttl, 6, 0, ip_sock, ip_addr) 155 | psh = struct.pack(b'!4s4sBBH', ip_sock, ip_addr, 0, socket.IPPROTO_TCP, 20 + len(fakedata)) 156 | 157 | if ttl == 1: 158 | tcp_header = struct.pack(b'!HHLLBBHHH', sockname[1], addr[1], aseq, seq+1, 80, 24, 454, 0, 0) 159 | packet = ip_header + tcp_header + fakedata 160 | s_send.sendto(packet, (addr[0], 0)) 161 | remote.sendall(data) 162 | s_send.sendto(packet, (addr[0], 0)) 163 | elif ttl == 2: 164 | tcp_header = struct.pack(b'!HHLLBBHHH', sockname[1], addr[1], aseq, seq, 80, 24, 454, 0, 0) 165 | tcp_packet = tcp_header + fakedata 166 | tcp_checksum = checksum(psh + tcp_packet) 167 | tcp_header = struct.pack(b'!16sH2s', tcp_header[:16], tcp_checksum, tcp_header[18:]) 168 | packet = ip_header + tcp_header + fakedata 169 | s_send.sendto(packet, (addr[0], 0)) 170 | remote.sendall(data) 171 | s_send.sendto(packet, (addr[0], 0)) 172 | else: 173 | tcp_header = struct.pack(b'!HHLLBBHHH', sockname[1], addr[1], aseq, seq+1, 80, 24, 454, 0, 0) 174 | tcp_packet = tcp_header + fakedata 175 | tcp_checksum = checksum(psh + tcp_packet) 176 | tcp_header = struct.pack(b'!16sH2s', tcp_header[:16], tcp_checksum, tcp_header[18:]) 177 | packet = ip_header + tcp_header + fakedata 178 | s_send.sendto(packet, (addr[0], 0)) 179 | remote.sendall(data) 180 | s_send.sendto(packet, (addr[0], 0)) 181 | 182 | def connect(self, addr, data, sni, ttl, mss, keep, event_connected, event_ready, mutex): 183 | global WAN 184 | sock = self.connection 185 | try: 186 | isIPv6 = addr[0].find(':') != -1 187 | if isIPv6: 188 | remote = socket.socket(socket.AF_INET6, socket.SOCK_STREAM) 189 | else: 190 | remote = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 191 | 192 | if WAN != []: 193 | wan = random.choice(WAN) 194 | remote.bind((wan, 0)) 195 | 196 | if mss > 0: 197 | remote.setsockopt(socket.SOL_TCP, socket.TCP_MAXSEG, mss) 198 | remote.settimeout(3.0) 199 | s_recv_tcp = None 200 | seq = 0 201 | aseq = 0 202 | 203 | if ttl > 0: 204 | if isIPv6: 205 | s_recv_tcp = socket.socket(socket.AF_INET6, socket.SOCK_RAW, socket.IPPROTO_TCP) 206 | else: 207 | s_recv_tcp = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_TCP) 208 | s_recv_tcp.connect(addr) 209 | remote.connect(addr) 210 | remote.settimeout(None) 211 | 212 | if mutex.acquire(2): 213 | if event_connected.isSet() == False: 214 | event_connected.set() 215 | else: 216 | mutex.release() 217 | s_recv_tcp.close() 218 | remote.close() 219 | return 220 | else: 221 | s_recv_tcp.close() 222 | remote.close() 223 | return 224 | 225 | while not event_ready.isSet(): 226 | packet = s_recv_tcp.recv(2048) 227 | 228 | if isIPv6: 229 | tcp_header = packet[:20] 230 | else: 231 | tcp_header = packet[20:40] 232 | tcph = struct.unpack(b'!HHIIBBHHH', tcp_header) 233 | sport, dport, seq, aseq, headlen, flags, win, chechsum, p = tcph 234 | 235 | if dport == remote.getsockname()[1]: 236 | break 237 | 238 | s_recv_tcp.close() 239 | 240 | s_send = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_RAW) 241 | 242 | if keep: 243 | data = http_filter(data) 244 | fakedata = ' ' * len(data) 245 | else: 246 | fakedata = ' ' * len(data) 247 | 248 | remote.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1) 249 | offset = data.find(sni) + len(sni) / 2 250 | 251 | self.sendall(remote, s_send, ttl, aseq, seq, data[:offset], fakedata) 252 | 253 | if event_ready.isSet(): 254 | s_send.close() 255 | remote.close() 256 | return 257 | 258 | remote.sendall(data[offset:]) 259 | 260 | if keep: 261 | rstword = '' 262 | try: 263 | aseq += len(data) 264 | fdset = [sock, remote] 265 | while True: 266 | r, w, e = select.select(fdset, [], []) 267 | if sock in r: 268 | data = sock.recv(32768) 269 | if len(data) <= 0: 270 | break 271 | data = http_filter(data) 272 | #print repr(data) 273 | fakedata = data.replace(sni, fakesni) 274 | offset = data.find(sni) + len(sni) / 2 275 | self.sendall(remote, s_send, ttl, aseq, seq, data[:offset], fakedata) 276 | remote.sendall(data[offset:]) 277 | #rstword = data 278 | aseq += len(data) 279 | 280 | if remote in r: 281 | data = remote.recv(32768) 282 | if len(data) <= 0: 283 | break 284 | seq += len(data) 285 | sock.sendall(data) 286 | except socket.error, e: 287 | logging.warn('Forward: %s %s' % (e, sni)) 288 | #print repr(rstword) 289 | finally: 290 | sock.close() 291 | remote.close() 292 | s_send.close() 293 | else: 294 | remote.connect(addr) 295 | if mutex.acquire(2): 296 | if self.remote: 297 | mutex.release() 298 | remote.close() 299 | return 300 | event_connected.set() 301 | else: 302 | remote.close() 303 | return 304 | self.remote = remote 305 | remote.settimeout(None) 306 | remote.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1) 307 | remote.sendall(data) 308 | if keep: 309 | self.forward(sock, remote) 310 | self.remote = remote 311 | mutex.release() 312 | event_ready.set() 313 | except socket.error, e: 314 | logging.warn(sni + ' ' + str(e)) 315 | return 316 | 317 | def handle_remote(self, rule, port, server_name, data, keep): 318 | try: 319 | event_connected = threading.Event() 320 | event_ready = threading.Event() 321 | 322 | round_count, waittime, ttl, mss, goodlist, addrlist = rule 323 | 324 | if round_count > 0: 325 | random.shuffle(goodlist) 326 | random.shuffle(addrlist) 327 | else: 328 | round_count = 1 329 | 330 | mutex = threading.Lock() 331 | count = len(goodlist) 332 | for i in xrange(count): 333 | addr = (goodlist[i], port) 334 | c = threading.Thread(target=self.connect, args=(addr, data, server_name, ttl, mss, keep, event_connected, event_ready, mutex,), name="connect") 335 | c.start() 336 | if i < count-1: 337 | if event_connected.wait(timeout=waittime): 338 | break 339 | else: 340 | event_connected.wait(timeout=2.0) 341 | 342 | if self.remote == False: 343 | goodlist = [] 344 | for r in xrange(round_count): 345 | count = len(addrlist) 346 | for i in xrange(count): 347 | addr = (addrlist[i], port) 348 | c = threading.Thread(target=self.connect, args=(addr, data, server_name, ttl, mss, keep, event_connected, event_ready, mutex,), name="connect") 349 | c.start() 350 | if i < count-1: 351 | if event_connected.wait(timeout=waittime): 352 | break 353 | else: 354 | event_connected.wait() 355 | 356 | if self.remote: 357 | goodlist.append(self.remote.getpeername()[0]) 358 | break 359 | event_ready.wait() 360 | return self.remote 361 | except socket.error, e: 362 | logging.warn(server_name + ' ' + str(e)) 363 | return 0 364 | 365 | def handle(self): 366 | global HOSTS 367 | server_name = '' 368 | try: 369 | sock = self.connection 370 | sock.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1) 371 | data = sock.recv(2048) 372 | 373 | server_name = self.parse_http(data) 374 | if server_name == '': 375 | server_name = self.parse(data) 376 | https = True 377 | port = 443 378 | else: 379 | https = False 380 | port = 80 381 | remote = 0 382 | 383 | root_name = server_name[server_name.find('.'):] 384 | if HOSTS.has_key(server_name): 385 | rule = HOSTS[server_name] 386 | else: 387 | if HOSTS.has_key(root_name): 388 | rule = HOSTS[root_name] 389 | else: 390 | if HOSTS.has_key('*'): 391 | if move_https(sock, data): 392 | return 393 | rule = HOSTS['*'] 394 | else: 395 | rule = None 396 | 397 | if rule: 398 | if isinstance(rule, str): 399 | rule = HOSTS[rule] 400 | 401 | round_count, waittime, ttl, mss, goodlist, addrlist = rule 402 | 403 | if https: 404 | remote = self.handle_remote(rule, port, server_name, data, False) 405 | if remote: 406 | global KEEPALIVE 407 | if KEEPALIVE: 408 | remote.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1) 409 | remote.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, 1) 410 | remote.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, 1) 411 | remote.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, 3) 412 | logging.info('%s->https://%s %s' % (self.client_address[0], server_name, remote.getpeername()[0])) 413 | self.forward(sock, remote) 414 | else: 415 | logging.info('%s->%s fail' % (self.client_address[0], server_name)) 416 | sock.close() 417 | else: 418 | logging.info('%s->http://%s' % (self.client_address[0], server_name)) 419 | self.handle_remote(rule, port, server_name, data, True) 420 | else: 421 | logging.info('%s->%s %s' % (self.client_address[0], server_name, 'Unknow')) 422 | sock.close() 423 | return 424 | except socket.error, e: 425 | logging.warn(server_name + ' ' + str(e)) 426 | sock.close() 427 | 428 | 429 | def main(): 430 | global PORT, LOCAL, IPv6 431 | 432 | logging.basicConfig(level=logging.DEBUG, 433 | format='%(asctime)s %(levelname)-8s %(message)s', 434 | datefmt='%Y-%m-%d %H:%M:%S', filemode='a+') 435 | 436 | IPv6 = False 437 | global INTERFACE 438 | 439 | try: 440 | if IPv6: 441 | ThreadingTCPServer.address_family = socket.AF_INET6 442 | server = ThreadingTCPServer(INTERFACE, SNIProxy) 443 | logging.info("starting local at %s:%d" % tuple(server.server_address[:2])) 444 | server.serve_forever() 445 | except socket.error, e: 446 | logging.error(e) 447 | except KeyboardInterrupt: 448 | server.shutdown() 449 | sys.exit(0) 450 | 451 | if __name__ == '__main__': 452 | main() 453 | --------------------------------------------------------------------------------