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# Copyright (C) 2012 Aldo Cortesi
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import sys, os, string, socket, time
import shutil, tempfile, threading
import optparse, SocketServer
import utils, flow, certutils, version, wsgi, netlib, protocol
from OpenSSL import SSL
class ProxyError(Exception):
def __init__(self, code, msg):
self.code, self.msg = code, msg
def __str__(self):
return "ProxyError(%s, %s)"%(self.code, self.msg)
class ProxyConfig:
def __init__(self, certfile = None, cacert = None, clientcerts = None, cert_wait_time=0, upstream_cert=False, body_size_limit = None, reverse_proxy=None, transparent_proxy=None):
assert not (reverse_proxy and transparent_proxy)
self.certfile = certfile
self.cacert = cacert
self.clientcerts = clientcerts
self.certdir = None
self.cert_wait_time = cert_wait_time
self.upstream_cert = upstream_cert
self.body_size_limit = body_size_limit
self.reverse_proxy = reverse_proxy
self.transparent_proxy = transparent_proxy
class RequestReplayThread(threading.Thread):
def __init__(self, config, flow, masterq):
self.config, self.flow, self.masterq = config, flow, masterq
threading.Thread.__init__(self)
def run(self):
try:
r = self.flow.request
server = ServerConnection(self.config, r.scheme, r.host, r.port)
server.send(r)
response = server.read_response(r)
response._send(self.masterq)
except (ProxyError, protocol.ProtocolError), v:
err = flow.Error(self.flow.request, v.msg)
err._send(self.masterq)
except netlib.NetLibError, v:
raise ProxyError(502, v)
class ServerConnection(netlib.TCPClient):
def __init__(self, config, scheme, host, port):
clientcert = None
if config.clientcerts:
path = os.path.join(config.clientcerts, self.host) + ".pem"
if os.path.exists(clientcert):
clientcert = path
netlib.TCPClient.__init__(
self,
True if scheme == "https" else False,
host,
port,
clientcert
)
self.config, self.scheme = config, scheme
self.requestcount = 0
def send(self, request):
self.requestcount += 1
try:
d = request._assemble()
if not d:
raise ProxyError(502, "Incomplete request could not not be readied for transmission.")
self.wfile.write(d)
self.wfile.flush()
except socket.error, err:
raise ProxyError(502, 'Error sending data to "%s": %s' % (request.host, err))
def read_response(self, request):
line = self.rfile.readline()
if line == "\r\n" or line == "\n": # Possible leftover from previous message
line = self.rfile.readline()
if not line:
raise ProxyError(502, "Blank server response.")
parts = line.strip().split(" ", 2)
if len(parts) == 2: # handle missing message gracefully
parts.append("")
if not len(parts) == 3:
raise ProxyError(502, "Invalid server response: %s."%line)
proto, code, msg = parts
httpversion = protocol.parse_http_protocol(proto)
if httpversion is None:
raise ProxyError(502, "Invalid HTTP version: %s."%httpversion)
try:
code = int(code)
except ValueError:
raise ProxyError(502, "Invalid server response: %s."%line)
headers = flow.ODictCaseless(protocol.read_headers(self.rfile))
if code >= 100 and code <= 199:
return self.read_response()
if request.method == "HEAD" or code == 204 or code == 304:
content = ""
else:
content = protocol.read_http_body(self.rfile, headers, True, self.config.body_size_limit)
return flow.Response(request, httpversion, code, msg, headers, content, self.cert)
def terminate(self):
try:
if not self.wfile.closed:
self.wfile.flush()
self.connection.close()
except IOError:
pass
class ProxyHandler(netlib.BaseHandler):
def __init__(self, config, connection, client_address, server, q):
self.mqueue = q
self.config = config
self.server_conn = None
self.proxy_connect_state = None
netlib.BaseHandler.__init__(self, connection, client_address, server)
def handle(self):
cc = flow.ClientConnect(self.client_address)
cc._send(self.mqueue)
while self.handle_request(cc) and not cc.close:
pass
cc.close = True
cd = flow.ClientDisconnect(cc)
cd._send(self.mqueue)
def server_connect(self, scheme, host, port):
sc = self.server_conn
if sc and (scheme, host, port) != (sc.scheme, sc.host, sc.port):
sc.terminate()
self.server_conn = None
if not self.server_conn:
try:
self.server_conn = ServerConnection(self.config, scheme, host, port)
except netlib.NetLibError, v:
raise ProxyError(502, v)
def handle_request(self, cc):
try:
request, err = None, None
try:
request = self.read_request(cc)
except IOError, v:
raise IOError, "Reading request: %s"%v
if request is None:
return
cc.requestcount += 1
app = self.server.apps.get(request)
if app:
app.serve(request, self.wfile)
else:
request = request._send(self.mqueue)
if request is None:
return
if isinstance(request, flow.Response):
response = request
request = False
response = response._send(self.mqueue)
else:
if self.config.reverse_proxy:
scheme, host, port = self.config.reverse_proxy
else:
scheme, host, port = request.scheme, request.host, request.port
self.server_connect(scheme, host, port)
self.server_conn.send(request)
try:
response = self.server_conn.read_response(request)
except IOError, v:
raise IOError, "Reading response: %s"%v
response = response._send(self.mqueue)
if response is None:
self.server_conn.terminate()
if response is None:
return
self.send_response(response)
if protocol.request_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 protocol.response_connection_close(response.httpversion, response.headers):
return
except IOError, v:
cc.connection_error = v
except (ProxyError, protocol.ProtocolError), e:
cc.connection_error = "%s: %s"%(e.code, e.msg)
if request:
err = flow.Error(request, e.msg)
err._send(self.mqueue)
self.send_error(e.code, e.msg)
else:
return True
def find_cert(self, host, port):
if self.config.certfile:
return self.config.certfile
else:
sans = []
if self.config.upstream_cert:
cert = certutils.get_remote_cert(host, port)
sans = cert.altnames
host = cert.cn
ret = certutils.dummy_cert(self.config.certdir, self.config.cacert, host, sans)
time.sleep(self.config.cert_wait_time)
if not ret:
raise ProxyError(502, "mitmproxy: Unable to generate dummy cert.")
return ret
def read_request(self, client_conn):
line = self.rfile.readline()
if line == "\r\n" or line == "\n": # Possible leftover from previous message
line = self.rfile.readline()
if line == "":
return None
if self.config.transparent_proxy:
host, port = self.config.transparent_proxy["resolver"].original_addr(self.connection)
if port in self.config.transparent_proxy["sslports"]:
scheme = "https"
certfile = self.find_cert(host, port)
self.convert_to_ssl(certfile, self.config.certfile or self.config.cacert)
else:
scheme = "http"
method, path, httpversion = protocol.parse_init_http(line)
headers = flow.ODictCaseless(protocol.read_headers(self.rfile))
content = protocol.read_http_body_request(
self.rfile, self.wfile, headers, httpversion, self.config.body_size_limit
)
return flow.Request(client_conn, httpversion, host, port, "http", method, path, headers, content)
elif self.config.reverse_proxy:
scheme, host, port = self.config.reverse_proxy
method, path, httpversion = protocol.parse_init_http(line)
headers = flow.ODictCaseless(protocol.read_headers(self.rfile))
content = protocol.read_http_body_request(
self.rfile, self.wfile, headers, httpversion, self.config.body_size_limit
)
return flow.Request(client_conn, httpversion, host, port, "http", method, path, headers, content)
else:
if line.startswith("CONNECT"):
host, port, httpversion = protocol.parse_init_connect(line)
# FIXME: Discard additional headers sent to the proxy. Should I expose
# these to users?
while 1:
d = self.rfile.readline()
if d == '\r\n' or d == '\n':
break
self.wfile.write(
'HTTP/1.1 200 Connection established\r\n' +
('Proxy-agent: %s\r\n'%version.NAMEVERSION) +
'\r\n'
)
self.wfile.flush()
certfile = self.find_cert(host, port)
self.convert_to_ssl(certfile, self.config.certfile or self.config.cacert)
self.proxy_connect_state = (host, port, httpversion)
line = self.rfile.readline(line)
if self.proxy_connect_state:
host, port, httpversion = self.proxy_connect_state
method, path, httpversion = protocol.parse_init_http(line)
headers = flow.ODictCaseless(protocol.read_headers(self.rfile))
content = protocol.read_http_body_request(
self.rfile, self.wfile, headers, httpversion, self.config.body_size_limit
)
return flow.Request(client_conn, httpversion, host, port, "https", method, path, headers, content)
else:
method, scheme, host, port, path, httpversion = protocol.parse_init_proxy(line)
headers = flow.ODictCaseless(protocol.read_headers(self.rfile))
content = protocol.read_http_body_request(
self.rfile, self.wfile, headers, httpversion, self.config.body_size_limit
)
return flow.Request(client_conn, httpversion, host, port, scheme, method, path, headers, content)
def send_response(self, response):
d = response._assemble()
if not d:
raise ProxyError(502, "Incomplete response could not not be readied for transmission.")
self.wfile.write(d)
self.wfile.flush()
def send_error(self, code, body):
try:
import BaseHTTPServer
response = BaseHTTPServer.BaseHTTPRequestHandler.responses[code][0]
self.wfile.write("HTTP/1.1 %s %s\r\n" % (code, response))
self.wfile.write("Server: %s\r\n"%version.NAMEVERSION)
self.wfile.write("Connection: close\r\n")
self.wfile.write("Content-type: text/html\r\n")
self.wfile.write("\r\n")
self.wfile.write('<html><head>\n<title>%d %s</title>\n</head>\n'
'<body>\n%s\n</body>\n</html>' % (code, response, body))
self.wfile.flush()
except:
pass
class ProxyServerError(Exception): pass
class ProxyServer(netlib.TCPServer):
allow_reuse_address = True
bound = True
def __init__(self, config, port, address=''):
"""
Raises ProxyServerError if there's a startup problem.
"""
self.config, self.port, self.address = config, port, address
try:
netlib.TCPServer.__init__(self, (address, port))
except socket.error, v:
raise ProxyServerError('Error starting proxy server: ' + v.strerror)
self.masterq = None
self.certdir = tempfile.mkdtemp(prefix="mitmproxy")
config.certdir = self.certdir
self.apps = wsgi.AppRegistry()
def start_slave(self, klass, masterq):
slave = klass(masterq, self)
slave.start()
def set_mqueue(self, q):
self.masterq = q
def handle_connection(self, request, client_address):
ProxyHandler(self.config, request, client_address, self, self.masterq)
def handle_shutdown(self):
try:
shutil.rmtree(self.certdir)
except OSError:
pass
class DummyServer:
bound = False
def __init__(self, config):
self.config = config
def start_slave(self, klass, masterq):
pass
def shutdown(self):
pass
# Command-line utils
def certificate_option_group(parser):
group = optparse.OptionGroup(parser, "SSL")
group.add_option(
"--cert", action="store",
type = "str", dest="cert", default=None,
help = "User-created SSL certificate file."
)
group.add_option(
"--client-certs", action="store",
type = "str", dest = "clientcerts", default=None,
help = "Client certificate directory."
)
parser.add_option_group(group)
def process_proxy_options(parser, options):
if options.cert:
options.cert = os.path.expanduser(options.cert)
if not os.path.exists(options.cert):
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)
if getattr(options, "cache", None) is not None:
options.cache = os.path.expanduser(options.cache)
body_size_limit = utils.parse_size(options.body_size_limit)
if options.reverse_proxy:
rp = utils.parse_proxy_spec(options.reverse_proxy)
if not rp:
parser.error("Invalid reverse proxy specification: %s"%options.reverse_proxy)
else:
rp = 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):
parser.error("Client certificate directory does not exist or is not a directory: %s"%options.clientcerts)
return ProxyConfig(
certfile = options.cert,
cacert = cacert,
clientcerts = options.clientcerts,
cert_wait_time = options.cert_wait_time,
body_size_limit = body_size_limit,
upstream_cert = options.upstream_cert,
reverse_proxy = rp
)
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