mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-11-23 08:11:00 +00:00
437 lines
16 KiB
Python
437 lines
16 KiB
Python
import os, socket, time, threading
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from OpenSSL import SSL
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from netlib import tcp, http, certutils, http_auth
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import utils, flow, version, platform, controller
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TRANSPARENT_SSL_PORTS = [443, 8443]
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KILL = 0
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class ProxyError(Exception):
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def __init__(self, code, msg, headers=None):
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self.code, self.msg, self.headers = code, msg, headers
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def __str__(self):
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return "ProxyError(%s, %s)" % (self.code, self.msg)
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import protocol
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class Log:
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def __init__(self, msg):
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self.msg = msg
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class ProxyConfig:
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def __init__(self, certfile=None, cacert=None, clientcerts=None, no_upstream_cert=False, body_size_limit=None,
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reverse_proxy=None, forward_proxy=None, transparent_proxy=None, authenticator=None):
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self.certfile = certfile
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self.cacert = cacert
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self.clientcerts = clientcerts
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self.no_upstream_cert = no_upstream_cert
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self.body_size_limit = body_size_limit
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self.reverse_proxy = reverse_proxy
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self.forward_proxy = forward_proxy
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self.transparent_proxy = transparent_proxy
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self.authenticator = authenticator
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self.certstore = certutils.CertStore()
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class ClientConnection(tcp.BaseHandler):
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def __init__(self, client_connection, host, port):
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tcp.BaseHandler.__init__(self, client_connection)
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self.host, self.port = host, port
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self.timestamp_start = utils.timestamp()
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self.timestamp_end = None
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self.timestamp_ssl_setup = None
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@property
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def address(self):
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return self.host, self.port
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def convert_to_ssl(self, *args, **kwargs):
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tcp.BaseHandler.convert_to_ssl(self, *args, **kwargs)
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self.timestamp_ssl_setup = utils.timestamp()
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def finish(self):
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tcp.BaseHandler.finish(self)
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self.timestamp_end = utils.timestamp()
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class ServerConnection(tcp.TCPClient):
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def __init__(self, host, port):
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tcp.TCPClient.__init__(self, host, port)
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self.timestamp_start = None
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self.timestamp_end = None
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self.timestamp_tcp_setup = None
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self.timestamp_ssl_setup = None
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@property
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def address(self):
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return self.host, self.port
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def connect(self):
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self.timestamp_start = utils.timestamp()
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tcp.TCPClient.connect(self)
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self.timestamp_tcp_setup = utils.timestamp()
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def establish_ssl(self, clientcerts, sni):
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clientcert = None
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if clientcerts:
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path = os.path.join(clientcerts, self.host.encode("idna")) + ".pem"
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if os.path.exists(path):
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clientcert = path
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try:
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self.convert_to_ssl(cert=clientcert, sni=sni)
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self.timestamp_ssl_setup = utils.timestamp()
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except tcp.NetLibError, v:
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raise ProxyError(400, str(v))
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def finish(self):
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tcp.TCPClient.finish(self)
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self.timestamp_end = utils.timestamp()
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"""
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class RequestReplayThread(threading.Thread):
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def __init__(self, config, flow, masterq):
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self.config, self.flow, self.channel = config, flow, controller.Channel(masterq)
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threading.Thread.__init__(self)
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def run(self):
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try:
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r = self.flow.request
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server = ServerConnection(self.config, r.scheme, r.host, r.port, r.host)
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server.connect()
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server.send(r)
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tsstart = utils.timestamp()
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httpversion, code, msg, headers, content = http.read_response(
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server.rfile, r.method, self.config.body_size_limit
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)
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response = flow.Response(
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self.flow.request, httpversion, code, msg, headers, content, server.cert,
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server.rfile.first_byte_timestamp
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)
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self.channel.ask("response", response)
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except (ProxyError, http.HttpError, tcp.NetLibError), v:
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err = flow.Error(self.flow.request, str(v))
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self.channel.ask("error", err)
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"""
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class ConnectionHandler:
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def __init__(self, config, client_connection, client_address, server, channel, server_version):
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self.config = config
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self.client_conn = ClientConnection(client_connection, *client_address)
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self.server_conn = None
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self.channel, self.server_version = channel, server_version
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self.close = False
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self.conntype = None
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self.sni = None
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self.mode = "regular"
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if self.config.reverse_proxy:
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self.mode = "reverse"
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if self.config.transparent_proxy:
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self.mode = "transparent"
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def del_server_connection(self):
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if self.server_conn and self.server_conn.connection:
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self.server_conn.finish()
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self.log("serverdisconnect", ["%s:%s" % (self.server_conn.host, self.server_conn.port)])
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self.channel.tell("serverdisconnect", self)
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self.server_conn = None
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self.sni = None
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def handle(self):
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self.log("clientconnect")
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self.channel.ask("clientconnect", self)
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try:
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# Can we already identify the target server and connect to it?
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server_address = None
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if self.config.forward_proxy:
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server_address = self.config.forward_proxy[1:]
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else:
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if self.config.reverse_proxy:
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server_address = self.config.reverse_proxy[1:]
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elif self.config.transparent_proxy:
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server_address = self.config.transparent_proxy["resolver"].original_addr(
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self.client_conn.connection)
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if not server_address:
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raise ProxyError(502, "Transparent mode failure: could not resolve original destination.")
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self.log("transparent to %s:%s" % server_address)
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self.determine_conntype()
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if server_address:
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self.establish_server_connection(*server_address)
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self._handle_ssl()
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while not self.close:
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try:
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protocol.handle_messages(self.conntype, self)
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except protocol.ConnectionTypeChange:
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continue
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self.del_server_connection()
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except ProxyError, e:
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self.log(str(e))
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# FIXME: We need to persist errors
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self.log("clientdisconnect")
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self.channel.tell("clientdisconnect", self)
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def _handle_ssl(self):
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"""
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Check if we can already identify SSL connections.
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"""
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if self.config.transparent_proxy:
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client_ssl = server_ssl = (self.server_conn.port in self.config.transparent_proxy["sslports"])
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elif self.config.reverse_proxy:
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client_ssl = server_ssl = (self.config.reverse_proxy[0] == "https")
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# TODO: Make protocol generic (as with transparent proxies)
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# TODO: Add SSL-terminating capatbility (SSL -> mitmproxy -> plain and vice versa)
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self.establish_ssl(client=client_ssl, server=server_ssl)
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def finish(self):
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self.client_conn.finish()
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def determine_conntype(self):
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#TODO: Add ruleset to select correct protocol depending on mode/target port etc.
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self.conntype = "http"
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def establish_server_connection(self, host, port):
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"""
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Establishes a new server connection to the given server
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If there is already an existing server connection, it will be killed.
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"""
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self.del_server_connection()
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self.server_conn = ServerConnection(host, port)
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try:
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self.server_conn.connect()
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except tcp.NetLibError, v:
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raise ProxyError(502, v)
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self.log("serverconnect", ["%s:%s" % (host, port)])
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self.channel.tell("serverconnect", self)
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def establish_ssl(self, client=False, server=False):
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"""
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Establishes SSL on the existing connection(s) to the server or the client,
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as specified by the parameters. If the target server is on the pass-through list,
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the conntype attribute will be changed and no the SSL connection won't be wrapped.
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A protocol handler must raise a ConnTypeChanged exception if it detects that this is happening
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"""
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# TODO: Implement SSL pass-through handling and change conntype
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if self.server_conn.host == "ycombinator.com":
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self.conntype = "tcp"
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if server:
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if self.server_conn.ssl_established:
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raise ProxyError(502, "SSL to Server already established.")
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self.server_conn.establish_ssl(self.config.clientcerts, self.sni)
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if client:
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if self.client_conn.ssl_established:
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raise ProxyError(502, "SSL to Client already established.")
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dummycert = self.find_cert()
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self.client_conn.convert_to_ssl(dummycert, self.config.certfile or self.config.cacert,
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handle_sni=self.handle_sni)
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def server_reconnect(self, no_ssl=False):
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self.log("server reconnect")
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had_ssl, sni = self.server_conn.ssl_established, self.sni
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self.establish_server_connection(*self.server_conn.address)
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if had_ssl and not no_ssl:
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self.sni = sni
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self.establish_ssl(server=True)
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def log(self, msg, subs=()):
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msg = [
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"%s:%s: %s" % (self.client_conn.host, self.client_conn.port, msg)
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]
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for i in subs:
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msg.append(" -> " + i)
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msg = "\n".join(msg)
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self.channel.tell("log", Log(msg))
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def find_cert(self):
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if self.config.certfile:
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with open(self.config.certfile, "rb") as f:
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return certutils.SSLCert.from_pem(f.read())
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else:
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host = self.server_conn.host
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sans = []
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if not self.config.no_upstream_cert or not self.server_conn.ssl_established:
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upstream_cert = self.server_conn.cert
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if upstream_cert.cn:
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host = upstream_cert.cn.decode("utf8").encode("idna")
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sans = upstream_cert.altnames
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ret = self.config.certstore.get_cert(host, sans, self.config.cacert)
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if not ret:
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raise ProxyError(502, "Unable to generate dummy cert.")
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return ret
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def handle_sni(self, connection):
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"""
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This callback gets called during the SSL handshake with the client.
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The client has just sent the Sever Name Indication (SNI). We now connect upstream to
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figure out which certificate needs to be served.
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"""
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try:
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sn = connection.get_servername()
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if sn and sn != self.sni:
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self.sni = sn.decode("utf8").encode("idna")
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self.establish_server_connection() # reconnect to upstream server with SNI
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self.establish_ssl(server=True) # establish SSL with upstream
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# Now, change client context to reflect changed certificate:
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new_context = SSL.Context(SSL.TLSv1_METHOD)
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new_context.use_privatekey_file(self.config.certfile or self.config.cacert)
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dummycert = self.find_cert()
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new_context.use_certificate(dummycert.x509)
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connection.set_context(new_context)
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# An unhandled exception in this method will core dump PyOpenSSL, so
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# make dang sure it doesn't happen.
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except Exception, e: # pragma: no cover
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pass
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class ProxyServerError(Exception): pass
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class ProxyServer(tcp.TCPServer):
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allow_reuse_address = True
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bound = True
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def __init__(self, config, port, address='', server_version=version.NAMEVERSION):
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"""
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Raises ProxyServerError if there's a startup problem.
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"""
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self.config, self.port, self.address = config, port, address
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self.server_version = server_version
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try:
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tcp.TCPServer.__init__(self, (address, port))
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except socket.error, v:
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raise ProxyServerError('Error starting proxy server: ' + v.strerror)
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self.channel = None
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def start_slave(self, klass, channel):
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slave = klass(channel, self)
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slave.start()
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def set_channel(self, channel):
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self.channel = channel
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def handle_client_connection(self, conn, client_address):
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h = ConnectionHandler(self.config, conn, client_address, self, self.channel, self.server_version)
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h.handle()
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h.finish()
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class DummyServer:
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bound = False
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def __init__(self, config):
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self.config = config
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def start_slave(self, *args):
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pass
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def shutdown(self):
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pass
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# Command-line utils
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def certificate_option_group(parser):
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group = parser.add_argument_group("SSL")
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group.add_argument(
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"--cert", action="store",
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type=str, dest="cert", default=None,
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help="User-created SSL certificate file."
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)
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group.add_argument(
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"--client-certs", action="store",
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type=str, dest="clientcerts", default=None,
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help="Client certificate directory."
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)
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def process_proxy_options(parser, options):
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if options.cert:
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options.cert = os.path.expanduser(options.cert)
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if not os.path.exists(options.cert):
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return parser.error("Manually created certificate does not exist: %s" % options.cert)
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cacert = os.path.join(options.confdir, "mitmproxy-ca.pem")
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cacert = os.path.expanduser(cacert)
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if not os.path.exists(cacert):
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certutils.dummy_ca(cacert)
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body_size_limit = utils.parse_size(options.body_size_limit)
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if options.reverse_proxy and options.transparent_proxy:
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return parser.error("Can't set both reverse proxy and transparent proxy.")
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if options.transparent_proxy:
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if not platform.resolver:
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return parser.error("Transparent mode not supported on this platform.")
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trans = dict(
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resolver=platform.resolver(),
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sslports=TRANSPARENT_SSL_PORTS
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)
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else:
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trans = None
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if options.reverse_proxy:
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rp = utils.parse_proxy_spec(options.reverse_proxy)
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if not rp:
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return parser.error("Invalid reverse proxy specification: %s" % options.reverse_proxy)
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else:
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rp = None
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if options.forward_proxy:
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fp = utils.parse_proxy_spec(options.forward_proxy)
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if not fp:
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return parser.error("Invalid forward proxy specification: %s" % options.forward_proxy)
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else:
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fp = None
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if options.clientcerts:
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options.clientcerts = os.path.expanduser(options.clientcerts)
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if not os.path.exists(options.clientcerts) or not os.path.isdir(options.clientcerts):
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return parser.error(
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"Client certificate directory does not exist or is not a directory: %s" % options.clientcerts
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)
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if (options.auth_nonanonymous or options.auth_singleuser or options.auth_htpasswd):
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if options.auth_singleuser:
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if len(options.auth_singleuser.split(':')) != 2:
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return parser.error("Invalid single-user specification. Please use the format username:password")
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username, password = options.auth_singleuser.split(':')
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password_manager = http_auth.PassManSingleUser(username, password)
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elif options.auth_nonanonymous:
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password_manager = http_auth.PassManNonAnon()
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elif options.auth_htpasswd:
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try:
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password_manager = http_auth.PassManHtpasswd(options.auth_htpasswd)
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except ValueError, v:
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return parser.error(v.message)
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authenticator = http_auth.BasicProxyAuth(password_manager, "mitmproxy")
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else:
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authenticator = http_auth.NullProxyAuth(None)
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return ProxyConfig(
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certfile=options.cert,
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cacert=cacert,
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clientcerts=options.clientcerts,
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body_size_limit=body_size_limit,
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no_upstream_cert=options.no_upstream_cert,
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reverse_proxy=rp,
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forward_proxy=fp,
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transparent_proxy=trans,
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authenticator=authenticator
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)
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