mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-11-23 08:11:00 +00:00
371 lines
14 KiB
Python
371 lines
14 KiB
Python
import sys, os, string, socket, time
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import shutil, tempfile, threading
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import SocketServer
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from OpenSSL import SSL
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from netlib import odict, tcp, http, certutils, http_status, http_auth
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import utils, flow, version, platform, controller, protocol
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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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class ProxyConfig:
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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):
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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 ServerConnection(tcp.TCPClient):
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def __init__(self, config, host, port, sni):
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tcp.TCPClient.__init__(self, host, port)
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self.config = config
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self.sni = sni
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self.tcp_setup_timestamp = None
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self.ssl_setup_timestamp = None
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def connect(self):
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tcp.TCPClient.connect(self)
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self.tcp_setup_timestamp = time.time()
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def establish_ssl(self):
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clientcert = None
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if self.config.clientcerts:
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path = os.path.join(self.config.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=self.sni)
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self.ssl_setup_timestamp = time.time()
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except tcp.NetLibError, v:
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raise ProxyError(400, str(v))
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def send(self, request):
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print "deprecated"
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d = request._assemble()
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if not d:
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raise ProxyError(502, "Cannot transmit an incomplete request.")
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self.wfile.write(d)
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self.wfile.flush()
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def terminate(self):
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if self.connection:
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try:
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self.wfile.flush()
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except tcp.NetLibDisconnect: # pragma: no cover
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pass
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self.connection.close()
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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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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_address, self.client_conn = client_address, tcp.BaseHandler(client_connection)
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self.server_address, self.server_conn = None, None
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self.channel, self.server_version = channel, server_version
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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:
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self.server_conn.terminate()
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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("connect")
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self.channel.ask("clientconnect", self)
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# Can we already identify the target server and connect to it?
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if self.config.forward_proxy:
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self.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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self.server_address = self.config.reverse_proxy[1:]
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elif self.config.transparent_proxy:
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self.server_address = self.config.transparent_proxy["resolver"].original_addr(self.connection)
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if not self.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"%self.server_address)
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if self.server_address:
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self.establish_server_connection()
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self.handle_ssl()
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self.determine_conntype(self.mode, *self.server_address)
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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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self.log("disconnect")
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self.channel.tell("clientdisconnect", self)
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def determine_conntype(self, mode, host, port):
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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):
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"""
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Establishes a new server connection to self.server_address.
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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(self.config, *self.server_address, self.sni)
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self.channel.tell("serverconnect", self)
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def handle_ssl(self):
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if self.config.transparent_proxy:
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client_ssl, server_ssl = (self.server_address[1] 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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else:
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client_ssl, server_ssl = True # In regular mode, this function will only be called on HTTP CONNECT
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# TODO: Implement SSL pass-through handling and change conntype
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if server_ssl and not self.server_conn.ssl_established:
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self.server_conn.establish_ssl()
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if client_ssl and not self.client_conn.ssl_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, handle_sni=self.handle_sni)
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def log(self, msg, subs=()):
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msg = [
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"%s:%s: "%(self.client_address, 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", 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_address[0]
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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.handle_ssl() # 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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