This file is indexed.

/usr/lib/python2.7/dist-packages/libmproxy/proxy.py is in mitmproxy 0.15-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
import os, socket, time
import threading
from OpenSSL import SSL
from netlib import tcp, http, certutils, http_status, http_auth
import utils, flow, version, platform, controller


TRANSPARENT_SSL_PORTS = [443, 8443]

KILL = 0


class ProxyError(Exception):
    def __init__(self, code, msg, headers=None):
        self.code, self.msg, self.headers = code, msg, headers

    def __str__(self):
        return "ProxyError(%s, %s)"%(self.code, self.msg)


class Log:
    def __init__(self, msg):
        self.msg = msg


class ProxyConfig:
    def __init__(self, certfile = None, cacert = None, clientcerts = None, no_upstream_cert=False, body_size_limit = None, reverse_proxy=None, forward_proxy=None, transparent_proxy=None, authenticator=None):
        self.certfile = certfile
        self.cacert = cacert
        self.clientcerts = clientcerts
        self.no_upstream_cert = no_upstream_cert
        self.body_size_limit = body_size_limit
        self.reverse_proxy = reverse_proxy
        self.forward_proxy = forward_proxy
        self.transparent_proxy = transparent_proxy
        self.authenticator = authenticator
        self.certstore = certutils.CertStore()


class ServerConnection(tcp.TCPClient):
    def __init__(self, config, scheme, host, port, sni):
        tcp.TCPClient.__init__(self, host, port)
        self.config = config
        self.scheme, self.sni = scheme, sni
        self.requestcount = 0
        self.tcp_setup_timestamp = None
        self.ssl_setup_timestamp = None

    def connect(self):
        tcp.TCPClient.connect(self)
        self.tcp_setup_timestamp = time.time()
        if self.scheme == "https":
            clientcert = None
            if self.config.clientcerts:
                path = os.path.join(self.config.clientcerts, self.host.encode("idna")) + ".pem"
                if os.path.exists(path):
                    clientcert = path
            try:
                self.convert_to_ssl(cert=clientcert, sni=self.sni)
                self.ssl_setup_timestamp = time.time()
            except tcp.NetLibError, v:
                raise ProxyError(400, str(v))

    def send(self, request):
        self.requestcount += 1
        d = request._assemble()
        if not d:
            raise ProxyError(502, "Cannot transmit an incomplete request.")
        self.wfile.write(d)
        self.wfile.flush()

    def terminate(self):
        if self.connection:
            try:
                self.wfile.flush()
            except tcp.NetLibDisconnect: # pragma: no cover
                pass
            self.connection.close()



class RequestReplayThread(threading.Thread):
    def __init__(self, config, flow, masterq):
        self.config, self.flow, self.channel = config, flow, controller.Channel(masterq)
        threading.Thread.__init__(self)

    def run(self):
        try:
            r = self.flow.request
            server = ServerConnection(self.config, r.scheme, r.host, r.port, r.host)
            server.connect()
            server.send(r)
            httpversion, code, msg, headers, content = http.read_response(
                server.rfile, r.method, self.config.body_size_limit
            )
            response = flow.Response(
                self.flow.request, httpversion, code, msg, headers, content, server.cert, 
                server.rfile.first_byte_timestamp
            )
            self.channel.ask("response", response)
        except (ProxyError, http.HttpError, tcp.NetLibError), v:
            err = flow.Error(self.flow.request, str(v))
            self.channel.ask("error", err)


class HandleSNI:
    def __init__(self, handler, client_conn, host, port, key):
        self.handler, self.client_conn, self.host, self.port = handler, client_conn, host, port
        self.key = key

        # Fix pyOpenSSL 0.14 compatibility
        # https://github.com/mitmproxy/mitmproxy/issues/226
        self.__name__ = "HandleSNI"

    def __call__(self, client_connection):
        try:
            sn = client_connection.get_servername()
            if sn:
                self.handler.get_server_connection(self.client_conn, "https", self.host, self.port, sn)
                dummycert = self.handler.find_cert(self.client_conn, self.host, self.port, sn)
                new_context = SSL.Context(SSL.TLSv1_METHOD)
                new_context.use_privatekey_file(self.key)
                new_context.use_certificate(dummycert.x509)
                client_connection.set_context(new_context)
                self.handler.sni = sn.decode("utf8").encode("idna")
        # An unhandled exception in this method will core dump PyOpenSSL, so
        # make dang sure it doesn't happen.
        except Exception: # pragma: no cover
            pass


class ProxyHandler(tcp.BaseHandler):
    def __init__(self, config, connection, client_address, server, channel, server_version):
        self.channel, self.server_version = channel, server_version
        self.config = config
        self.proxy_connect_state = None
        self.sni = None
        self.server_conn = None
        tcp.BaseHandler.__init__(self, connection, client_address, server)

    def get_server_connection(self, cc, scheme, host, port, sni, request=None):
        """
            When SNI is in play, this means we have an SSL-encrypted
            connection, which means that the entire handler is dedicated to a
            single server connection - no multiplexing. If this assumption ever
            breaks, we'll have to do something different with the SNI host
            variable on the handler object.

            `conn_info` holds the initial connection's parameters, as the
            hook might change them. Also, the hook might require an initial
            request to figure out connection settings; in this case it can
            set require_request, which will cause the connection to be
            re-opened after the client's request arrives.
        """
        sc = self.server_conn
        if not sni:
            sni = host
        conn_info = (scheme, host, port, sni)
        if sc and (conn_info != sc.conn_info or (request and sc.require_request)):
            sc.terminate()
            self.server_conn = None
            self.log(
                cc,
                "switching connection", [
                    "%s://%s:%s (sni=%s) -> %s://%s:%s (sni=%s)"%(
                        scheme, host, port, sni,
                        sc.scheme, sc.host, sc.port, sc.sni
                    )
                ]
            )
        if not self.server_conn:
            try:
                self.server_conn = ServerConnection(self.config, scheme, host, port, sni)

                # Additional attributes, used if the server_connect hook
                # needs to change parameters
                self.server_conn.request = request
                self.server_conn.require_request = False

                self.server_conn.conn_info = conn_info
                self.channel.ask("serverconnect", self.server_conn)
                self.server_conn.connect()
            except tcp.NetLibError, v:
                raise ProxyError(502, v)
        return self.server_conn

    def del_server_connection(self):
        if self.server_conn:
            self.server_conn.terminate()
        self.server_conn = None

    def handle(self):
        cc = flow.ClientConnect(self.client_address)
        self.log(cc, "connect")
        self.channel.ask("clientconnect", cc)
        while self.handle_request(cc) and not cc.close:
            pass
        cc.close = True
        self.del_server_connection()

        cd = flow.ClientDisconnect(cc)
        self.log(
            cc, "disconnect",
            [
                "handled %s requests"%cc.requestcount]
        )
        self.channel.tell("clientdisconnect", cd)

    def handle_request(self, cc):
        try:
            request, err = None, None
            request = self.read_request(cc)
            if request is None:
                return
            cc.requestcount += 1

            request_reply = self.channel.ask("request", request)
            if request_reply is None or request_reply == KILL:
                return
            elif isinstance(request_reply, flow.Response):
                request = False
                response = request_reply
                response_reply = self.channel.ask("response", response)
            else:
                request = request_reply
                if self.config.reverse_proxy:
                    scheme, host, port = self.config.reverse_proxy
                elif self.config.forward_proxy:
                    scheme, host, port = self.config.forward_proxy
                else:
                    scheme, host, port = request.scheme, request.host, request.port

                # If we've already pumped a request over this connection,
                # it's possible that the server has timed out. If this is
                # the case, we want to reconnect without sending an error
                # to the client.
                while 1:
                    sc = self.get_server_connection(cc, scheme, host, port, self.sni, request=request)
                    sc.send(request)
                    if sc.requestcount == 1: # add timestamps only for first request (others are not directly affected)
                        request.tcp_setup_timestamp = sc.tcp_setup_timestamp
                        request.ssl_setup_timestamp = sc.ssl_setup_timestamp
                    sc.rfile.reset_timestamps()
                    try:
                        peername = sc.connection.getpeername()
                        if peername:
                            request.ip = peername[0]
                        httpversion, code, msg, headers, content = http.read_response(
                            sc.rfile,
                            request.method,
                            self.config.body_size_limit
                        )
                    except http.HttpErrorConnClosed:
                        self.del_server_connection()
                        if sc.requestcount > 1:
                            continue
                        else:
                            raise
                    except http.HttpError:
                        raise ProxyError(502, "Invalid server response.")
                    else:
                        break

                response = flow.Response(
                    request, httpversion, code, msg, headers, content, sc.cert,
                    sc.rfile.first_byte_timestamp
                )
                response_reply = self.channel.ask("response", response)
                # Not replying to the server invalidates the server
                # connection, so we terminate.
                if response_reply == KILL:
                    sc.terminate()

            if response_reply == KILL:
                return
            else:
                response = response_reply
                self.send_response(response)
                if request and http.connection_close(request.httpversion, request.headers):
                    return
                # We could keep the client connection when the server
                # connection needs to go away.  However, we want to mimic
                # behaviour as closely as possible to the client, so we
                # disconnect.
                if http.connection_close(response.httpversion, response.headers):
                    return
        except (IOError, ProxyError, http.HttpError, tcp.NetLibError), e:
            if hasattr(e, "code"):
                cc.error = "%s: %s"%(e.code, e.msg)
            else:
                cc.error = str(e)

            if request:
                err = flow.Error(request, cc.error)
                self.channel.ask("error", err)
                self.log(
                    cc, cc.error,
                    ["url: %s"%request.get_url()]
                )
            else:
                self.log(cc, cc.error)
            if isinstance(e, ProxyError):
                self.send_error(e.code, e.msg, e.headers)
        else:
            return True

    def log(self, cc, msg, subs=()):
        msg = [
            "%s:%s: "%cc.address + msg
        ]
        for i in subs:
            msg.append("  -> "+i)
        msg = "\n".join(msg)
        l = Log(msg)
        self.channel.tell("log", l)

    def find_cert(self, cc, host, port, sni):
        if self.config.certfile:
            with open(self.config.certfile, "rb") as f:
                return certutils.SSLCert.from_pem(f.read())
        else:
            sans = []
            if not self.config.no_upstream_cert:
                conn = self.get_server_connection(cc, "https", host, port, sni)
                sans = conn.cert.altnames
                if conn.cert.cn:
                    host = conn.cert.cn.decode("utf8").encode("idna")
            ret = self.config.certstore.get_cert(host, sans, self.config.cacert)
            if not ret:
                raise ProxyError(502, "Unable to generate dummy cert.")
            return ret

    def establish_ssl(self, client_conn, host, port):
        dummycert = self.find_cert(client_conn, host, port, host)
        sni = HandleSNI(
            self, client_conn, host, port, self.config.certfile or self.config.cacert
        )
        try:
            self.convert_to_ssl(dummycert, self.config.certfile or self.config.cacert, handle_sni=sni)
        except tcp.NetLibError, v:
            raise ProxyError(400, str(v))

    def get_line(self, fp):
        """
            Get a line, possibly preceded by a blank.
        """
        line = fp.readline()
        if line == "\r\n" or line == "\n": # Possible leftover from previous message
            line = fp.readline()
        return line

    def read_request(self, client_conn):
        self.rfile.reset_timestamps()
        if self.config.transparent_proxy:
            return self.read_request_transparent(client_conn)
        elif self.config.reverse_proxy:
            return self.read_request_reverse(client_conn)
        else:
            return self.read_request_proxy(client_conn)

    def read_request_transparent(self, client_conn):
        orig = self.config.transparent_proxy["resolver"].original_addr(self.connection)
        if not orig:
            raise ProxyError(502, "Transparent mode failure: could not resolve original destination.")
        self.log(client_conn, "transparent to %s:%s"%orig)

        host, port = orig
        if port in self.config.transparent_proxy["sslports"]:
            scheme = "https"
        else:
            scheme = "http"

        return self._read_request_origin_form(client_conn, scheme, host, port)

    def read_request_reverse(self, client_conn):
        scheme, host, port = self.config.reverse_proxy
        return self._read_request_origin_form(client_conn, scheme, host, port)

    def read_request_proxy(self, client_conn):
        # Check for a CONNECT command.
        if not self.proxy_connect_state:
            line = self.get_line(self.rfile)
            if line == "":
                return None
            self.proxy_connect_state = self._read_request_authority_form(line)

        # Check for an actual request
        if self.proxy_connect_state:
            host, port, _ = self.proxy_connect_state
            return self._read_request_origin_form(client_conn, "https", host, port)
        else:
            # noinspection PyUnboundLocalVariable
            return self._read_request_absolute_form(client_conn, line)

    def _read_request_authority_form(self, line):
        """
        The authority-form of request-target is only used for CONNECT requests.
        The CONNECT method is used to request a tunnel to the destination server.
        This function sends a "200 Connection established" response to the client
        and returns the host information that can be used to process further requests in origin-form.
        An example authority-form request line would be:
            CONNECT www.example.com:80 HTTP/1.1
        """
        connparts = http.parse_init_connect(line)
        if connparts:
            self.read_headers(authenticate=True)
            # respond according to http://tools.ietf.org/html/draft-luotonen-web-proxy-tunneling-01 section 3.2
            self.wfile.write(
                'HTTP/1.1 200 Connection established\r\n' +
                ('Proxy-agent: %s\r\n'%self.server_version) +
                '\r\n'
            )
            self.wfile.flush()
        return connparts

    def _read_request_absolute_form(self, client_conn, line):
        """
        When making a request to a proxy (other than CONNECT or OPTIONS),
        a client must send the target uri in absolute-form.
        An example absolute-form request line would be:
            GET http://www.example.com/foo.html HTTP/1.1
        """
        r = http.parse_init_proxy(line)
        if not r:
            raise ProxyError(400, "Bad HTTP request line: %s"%repr(line))
        method, scheme, host, port, path, httpversion = r
        headers = self.read_headers(authenticate=True)
        self.handle_expect_header(headers, httpversion)
        content = http.read_http_body(
            self.rfile, headers, self.config.body_size_limit, True
        )
        r = flow.Request(
            client_conn, httpversion, host, port, scheme, method, path, headers, content,
            self.rfile.first_byte_timestamp, utils.timestamp()
        )
        r.set_live(self.rfile, self.wfile)
        return r

    def _read_request_origin_form(self, client_conn, scheme, host, port):
        """
        Read a HTTP request with regular (origin-form) request line.
        An example origin-form request line would be:
            GET /foo.html HTTP/1.1

        The request destination is already known from one of the following sources:
        1) transparent proxy: destination provided by platform resolver
        2) reverse proxy: fixed destination
        3) regular proxy: known from CONNECT command.
        """
        if scheme.lower() == "https" and not self.ssl_established:
            self.establish_ssl(client_conn, host, port)

        line = self.get_line(self.rfile)
        if line == "":
            return None

        r = http.parse_init_http(line)
        if not r:
            raise ProxyError(400, "Bad HTTP request line: %s"%repr(line))
        method, path, httpversion = r
        headers = self.read_headers(authenticate=False)
        self.handle_expect_header(headers, httpversion)
        content = http.read_http_body(
            self.rfile, headers, self.config.body_size_limit, True
        )
        r = flow.Request(
            client_conn, httpversion, host, port, scheme, method, path, headers, content,
            self.rfile.first_byte_timestamp, utils.timestamp()
        )
        r.set_live(self.rfile, self.wfile)
        return r

    def handle_expect_header(self, headers, httpversion):
        if "expect" in headers:
            if "100-continue" in headers['expect'] and httpversion >= (1, 1):
                #FIXME: Check if content-length is over limit
                self.wfile.write('HTTP/1.1 100 Continue\r\n'
                                 '\r\n')
                del headers['expect']

    def read_headers(self, authenticate=False):
        headers = http.read_headers(self.rfile)
        if headers is None:
            raise ProxyError(400, "Invalid headers")
        if authenticate and self.config.authenticator:
            if self.config.authenticator.authenticate(headers):
                self.config.authenticator.clean(headers)
            else:
                raise ProxyError(
                            407,
                            "Proxy Authentication Required",
                            self.config.authenticator.auth_challenge_headers()
                       )
        return headers

    def send_response(self, response):
        d = response._assemble()
        if not d:
            raise ProxyError(502, "Cannot transmit an incomplete response.")
        self.wfile.write(d)
        self.wfile.flush()

    def send_error(self, code, body, headers):
        try:
            response = http_status.RESPONSES.get(code, "Unknown")
            html_content = '<html><head>\n<title>%d %s</title>\n</head>\n<body>\n%s\n</body>\n</html>'%(code, response, body)
            self.wfile.write("HTTP/1.1 %s %s\r\n" % (code, response))
            self.wfile.write("Server: %s\r\n"%self.server_version)
            self.wfile.write("Content-type: text/html\r\n")
            self.wfile.write("Content-Length: %d\r\n"%len(html_content))
            if headers:
                for key, value in headers.items():
                    self.wfile.write("%s: %s\r\n"%(key, value))
            self.wfile.write("Connection: close\r\n")
            self.wfile.write("\r\n")
            self.wfile.write(html_content)
            self.wfile.flush()
        except:
            pass


class ProxyServerError(Exception): pass


class ProxyServer(tcp.TCPServer):
    allow_reuse_address = True
    bound = True
    def __init__(self, config, port, address='', server_version=version.NAMEVERSION):
        """
            Raises ProxyServerError if there's a startup problem.
        """
        self.config, self.port, self.address = config, port, address
        self.server_version = server_version
        try:
            tcp.TCPServer.__init__(self, (address, port))
        except socket.error, v:
            raise ProxyServerError('Error starting proxy server: ' + v.strerror)
        self.channel = None

    def start_slave(self, klass, channel):
        slave = klass(channel, self)
        slave.start()

    def set_channel(self, channel):
        self.channel = channel

    def handle_connection(self, request, client_address):
        h = ProxyHandler(self.config, request, client_address, self, self.channel, self.server_version)
        h.handle()
        h.finish()


class DummyServer:
    bound = False
    def __init__(self, config):
        self.config = config

    def start_slave(self, *args):
        pass

    def shutdown(self):
        pass


# Command-line utils
def certificate_option_group(parser):
    group = parser.add_argument_group("SSL")
    group.add_argument(
        "--cert", action="store",
        type = str, dest="cert", default=None,
        help = "User-created SSL certificate file."
    )
    group.add_argument(
        "--client-certs", action="store",
        type = str, dest = "clientcerts", default=None,
        help = "Client certificate directory."
    )



def process_proxy_options(parser, options):
    if options.cert:
        options.cert = os.path.expanduser(options.cert)
        if not os.path.exists(options.cert):
            return parser.error("Manually created certificate does not exist: %s"%options.cert)

    cacert = os.path.join(options.confdir, "mitmproxy-ca.pem")
    cacert = os.path.expanduser(cacert)
    if not os.path.exists(cacert):
        certutils.dummy_ca(cacert)
    body_size_limit = utils.parse_size(options.body_size_limit)
    if options.reverse_proxy and options.transparent_proxy:
        return parser.error("Can't set both reverse proxy and transparent proxy.")

    if options.transparent_proxy:
        if not platform.resolver:
            return parser.error("Transparent mode not supported on this platform.")
        trans = dict(
            resolver = platform.resolver(),
            sslports = TRANSPARENT_SSL_PORTS
        )
    else:
        trans = None

    if options.reverse_proxy:
        rp = utils.parse_proxy_spec(options.reverse_proxy)
        if not rp:
            return parser.error("Invalid reverse proxy specification: %s"%options.reverse_proxy)
    else:
        rp = None

    if options.forward_proxy:
        fp = utils.parse_proxy_spec(options.forward_proxy)
        if not fp:
            return parser.error("Invalid forward proxy specification: %s"%options.forward_proxy)
    else:
        fp = None

    if options.clientcerts:
        options.clientcerts = os.path.expanduser(options.clientcerts)
        if not os.path.exists(options.clientcerts) or not os.path.isdir(options.clientcerts):
            return parser.error(
                    "Client certificate directory does not exist or is not a directory: %s"%options.clientcerts
                )

    if (options.auth_nonanonymous or options.auth_singleuser or options.auth_htpasswd):
        if options.auth_singleuser:
            if len(options.auth_singleuser.split(':')) != 2:
                return parser.error("Invalid single-user specification. Please use the format username:password")
            username, password = options.auth_singleuser.split(':')
            password_manager = http_auth.PassManSingleUser(username, password)
        elif options.auth_nonanonymous:
            password_manager = http_auth.PassManNonAnon()
        elif options.auth_htpasswd:
            try:
                password_manager = http_auth.PassManHtpasswd(options.auth_htpasswd)
            except ValueError, v:
                return parser.error(v.message)
        authenticator = http_auth.BasicProxyAuth(password_manager, "mitmproxy")
    else:
        authenticator = http_auth.NullProxyAuth(None)

    return ProxyConfig(
        certfile = options.cert,
        cacert = cacert,
        clientcerts = options.clientcerts,
        body_size_limit = body_size_limit,
        no_upstream_cert = options.no_upstream_cert,
        reverse_proxy = rp,
        forward_proxy = fp,
        transparent_proxy = trans,
        authenticator = authenticator
    )