| | 1 | + | import argparse |
| | 2 | + | import os |
| | 3 | + | from plugins.plugin_client import ClientPlugin |
| | 4 | + | from subprocess import Popen, PIPE, TimeoutExpired |
| | 5 | + | |
| | 6 | + | |
| | 7 | + | class SNIIndiaClient(ClientPlugin): |
| | 8 | + | """ |
| | 9 | + | Defines the SNI client. |
| | 10 | + | """ |
| | 11 | + | name = "airtel_sni" |
| | 12 | + | |
| | 13 | + | def __init__(self, args): |
| | 14 | + | """ |
| | 15 | + | Initializes the SNI client. |
| | 16 | + | """ |
| | 17 | + | ClientPlugin.__init__(self) |
| | 18 | + | self.args = args |
| | 19 | + | |
| | 20 | + | @staticmethod |
| | 21 | + | def get_args(command): |
| | 22 | + | """ |
| | 23 | + | Defines args for this plugin |
| | 24 | + | """ |
| | 25 | + | super_args = ClientPlugin.get_args(command) |
| | 26 | + | |
| | 27 | + | parser = argparse.ArgumentParser(description="India SNI client") |
| | 28 | + | |
| | 29 | + | parser.add_argument("--server", action='store', help='server to connect to') |
| | 30 | + | parser.add_argument("--sni", action="store", help="sni to include in tls client hello") |
| | 31 | + | parser.add_argument("--timeout", action="store", help="timeout for requests", type=int) |
| | 32 | + | |
| | 33 | + | args, _ = parser.parse_known_args(command) |
| | 34 | + | args = vars(args) |
| | 35 | + | super_args.update(args) |
| | 36 | + | |
| | 37 | + | return super_args |
| | 38 | + | |
| | 39 | + | def run(self, args, logger, engine=None): |
| | 40 | + | """ |
| | 41 | + | Try to start a TLS handshake with the SNI set to a censored website and see if we receive a RST |
| | 42 | + | """ |
| | 43 | + | |
| | 44 | + | fitness = 0 |
| | 45 | + | port = int(args["port"]) |
| | 46 | + | server = args["server"] |
| | 47 | + | sni = args["sni"] |
| | 48 | + | timeout = args["timeout"] |
| | 49 | + | |
| | 50 | + | proc = Popen(["openssl", "s_client", "-connect" ,"%s:%d" % (server, port), "-servername", sni], stdin=PIPE, stdout=PIPE, stderr=PIPE) |
| | 51 | + | |
| | 52 | + | try: |
| | 53 | + | outs, errs = proc.communicate(input=b"Q", timeout=timeout) |
| | 54 | + | |
| | 55 | + | if b"read 0 bytes" in outs: |
| | 56 | + | fitness -= 90 |
| | 57 | + | logger.debug("TLS handshake blocked") |
| | 58 | + | elif proc.returncode == 0: |
| | 59 | + | fitness += 100 |
| | 60 | + | logger.debug("TLS handshake successful") |
| | 61 | + | else: |
| | 62 | + | fitness -= 100 |
| | 63 | + | logger.debug("Unknown error") |
| | 64 | + | except TimeoutExpired: |
| | 65 | + | proc.kill() |
| | 66 | + | fitness -= 100 |
| | 67 | + | logger.debug("Timeout") |
| | 68 | + | |
| | 69 | + | return fitness * 4 |
| | 70 | + | |
Kkevsterrr
committed
4 years ago
1 parent 4f44a82e