mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-11-30 11:19:23 +00:00
529 lines
18 KiB
Python
529 lines
18 KiB
Python
"""
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A simple proxy server implementation, which always reads all of a server
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response into memory, performs some transformation, and then writes it back
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to the client.
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"""
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import sys, os, string, socket, time
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import shutil, tempfile, threading
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import optparse, SocketServer, ssl
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import utils, flow
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NAME = "mitmproxy"
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class ProxyError(Exception):
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def __init__(self, code, msg):
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self.code, self.msg = code, msg
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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, ciphers = None, cacert = None, cert_wait_time=0, body_size_limit = None, reverse_proxy=None):
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self.certfile = certfile
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self.ciphers = ciphers
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self.cacert = cacert
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self.certdir = None
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self.cert_wait_time = cert_wait_time
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self.body_size_limit = body_size_limit
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self.reverse_proxy = reverse_proxy
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def read_headers(fp):
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"""
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Read a set of headers from a file pointer. Stop once a blank line
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is reached. Return a ODict object.
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"""
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ret = []
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name = ''
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while 1:
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line = fp.readline()
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if not line or line == '\r\n' or line == '\n':
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break
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if line[0] in ' \t':
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# continued header
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ret[-1][1] = ret[-1][1] + '\r\n ' + line.strip()
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else:
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i = line.find(':')
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# We're being liberal in what we accept, here.
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if i > 0:
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name = line[:i]
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value = line[i+1:].strip()
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ret.append([name, value])
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return flow.ODictCaseless(ret)
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def read_chunked(fp, limit):
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content = ""
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total = 0
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while 1:
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line = fp.readline(128)
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if line == "":
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raise IOError("Connection closed")
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if line == '\r\n' or line == '\n':
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continue
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try:
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length = int(line,16)
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except ValueError:
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# FIXME: Not strictly correct - this could be from the server, in which
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# case we should send a 502.
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raise ProxyError(400, "Invalid chunked encoding length: %s"%line)
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if not length:
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break
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total += length
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if limit is not None and total > limit:
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msg = "HTTP Body too large."\
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" Limit is %s, chunked content length was at least %s"%(limit, total)
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raise ProxyError(509, msg)
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content += fp.read(length)
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line = fp.readline(5)
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if line != '\r\n':
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raise IOError("Malformed chunked body")
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while 1:
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line = fp.readline()
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if line == "":
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raise IOError("Connection closed")
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if line == '\r\n' or line == '\n':
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break
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return content
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def read_http_body(rfile, connection, headers, all, limit):
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if 'transfer-encoding' in headers:
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if not ",".join(headers["transfer-encoding"]) == "chunked":
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raise IOError('Invalid transfer-encoding')
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content = read_chunked(rfile, limit)
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elif "content-length" in headers:
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try:
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l = int(headers["content-length"][0])
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except ValueError:
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# FIXME: Not strictly correct - this could be from the server, in which
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# case we should send a 502.
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raise ProxyError(400, "Invalid content-length header: %s"%headers["content-length"])
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if limit is not None and l > limit:
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raise ProxyError(509, "HTTP Body too large. Limit is %s, content-length was %s"%(limit, l))
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content = rfile.read(l)
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elif all:
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content = rfile.read(limit if limit else None)
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connection.close = True
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else:
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content = ""
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return content
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def parse_request_line(request):
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"""
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Parse a proxy request line. Return (method, scheme, host, port, path, minor).
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Raise ProxyError on error.
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"""
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try:
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method, url, protocol = string.split(request)
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except ValueError:
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raise ProxyError(400, "Can't parse request")
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if method == 'CONNECT':
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scheme = None
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path = None
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try:
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host, port = url.split(":")
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except ValueError:
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raise ProxyError(400, "Can't parse request")
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port = int(port)
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else:
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if url.startswith("/") or url == "*":
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scheme, port, host, path = None, None, None, url
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else:
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parts = utils.parse_url(url)
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if not parts:
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raise ProxyError(400, "Invalid url: %s"%url)
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scheme, host, port, path = parts
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if not protocol.startswith("HTTP/"):
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raise ProxyError(400, "Unsupported protocol")
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major,minor = protocol.split('/')[1].split('.')
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major = int(major)
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minor = int(minor)
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if major != 1:
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raise ProxyError(400, "Unsupported protocol")
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return method, scheme, host, port, path, minor
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class FileLike:
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def __init__(self, o):
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self.o = o
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def __getattr__(self, attr):
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return getattr(self.o, attr)
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def flush(self):
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pass
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def read(self, length):
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result = ''
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while len(result) < length:
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try:
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data = self.o.read(length)
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except AttributeError:
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break
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if not data:
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break
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result += data
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return result
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def readline(self):
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result = ''
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while True:
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ch = self.read(1)
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if not ch:
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break
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else:
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result += ch
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if ch == '\n':
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break
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return result
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#begin nocover
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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.masterq = config, flow, 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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server = ServerConnection(self.config, self.flow.request)
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server.send()
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response = server.read_response()
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response._send(self.masterq)
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except ProxyError, v:
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err = flow.Error(self.flow.request, v.msg)
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err._send(self.masterq)
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class ServerConnection:
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def __init__(self, config, request):
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self.config, self.request = config, request
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if config.reverse_proxy:
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self.scheme, self.host, self.port = config.reverse_proxy
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else:
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self.host = request.host
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self.port = request.port
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self.scheme = request.scheme
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self.close = False
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self.server, self.rfile, self.wfile = None, None, None
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self.connect()
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def connect(self):
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try:
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addr = socket.gethostbyname(self.host)
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server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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if self.scheme == "https":
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server = ssl.wrap_socket(server)
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server.connect((addr, self.port))
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except socket.error, err:
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raise ProxyError(502, 'Error connecting to "%s": %s' % (self.host, err))
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self.server = server
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self.rfile, self.wfile = server.makefile('rb'), server.makefile('wb')
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def send(self):
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self.request.close = self.close
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try:
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self.wfile.write(self.request._assemble())
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self.wfile.flush()
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except socket.error, err:
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raise ProxyError(502, 'Error sending data to "%s": %s' % (self.request.host, err))
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def read_response(self):
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line = self.rfile.readline()
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if line == "\r\n" or line == "\n": # Possible leftover from previous message
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line = self.rfile.readline()
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if not line:
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raise ProxyError(502, "Blank server response.")
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parts = line.strip().split(" ", 2)
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if len(parts) == 2: # handle missing message gracefully
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parts.append("")
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if not len(parts) == 3:
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raise ProxyError(502, "Invalid server response: %s."%line)
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proto, code, msg = parts
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try:
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code = int(code)
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except ValueError:
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raise ProxyError(502, "Invalid server response: %s."%line)
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headers = read_headers(self.rfile)
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if code >= 100 and code <= 199:
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return self.read_response()
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if self.request.method == "HEAD" or code == 204 or code == 304:
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content = ""
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else:
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content = read_http_body(self.rfile, self, headers, True, self.config.body_size_limit)
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return flow.Response(self.request, code, msg, headers, content)
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def terminate(self):
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try:
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if not self.wfile.closed:
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self.wfile.flush()
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self.server.close()
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except IOError:
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pass
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class ProxyHandler(SocketServer.StreamRequestHandler):
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def __init__(self, config, request, client_address, server, q):
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self.config = config
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self.mqueue = q
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SocketServer.StreamRequestHandler.__init__(self, request, client_address, server)
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def handle(self):
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cc = flow.ClientConnect(self.client_address)
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cc._send(self.mqueue)
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while not cc.close:
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self.handle_request(cc)
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cd = flow.ClientDisconnect(cc)
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cd._send(self.mqueue)
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self.finish()
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def handle_request(self, cc):
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server, request, err = None, None, None
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try:
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try:
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request = self.read_request(cc)
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except IOError, v:
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raise IOError, "Reading request: %s"%v
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if request is None:
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cc.close = True
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return
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cc.requestcount += 1
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request = request._send(self.mqueue)
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if request is None:
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cc.close = True
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return
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if isinstance(request, flow.Response):
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response = request
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request = False
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response = response._send(self.mqueue)
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else:
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server = ServerConnection(self.config, request)
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server.send()
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try:
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response = server.read_response()
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except IOError, v:
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raise IOError, "Reading response: %s"%v
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response = response._send(self.mqueue)
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if response is None:
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server.terminate()
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if response is None:
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cc.close = True
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return
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self.send_response(response)
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except IOError, v:
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cc.connection_error = v
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cc.close = True
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except ProxyError, e:
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cc.close = True
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cc.connection_error = "%s: %s"%(e.code, e.msg)
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if request:
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err = flow.Error(request, e.msg)
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err._send(self.mqueue)
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self.send_error(e.code, e.msg)
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if server:
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server.terminate()
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def find_cert(self, host):
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if self.config.certfile:
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return self.config.certfile
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else:
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ret = utils.dummy_cert(self.config.certdir, self.config.cacert, host)
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time.sleep(self.config.cert_wait_time)
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if not ret:
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raise ProxyError(502, "mitmproxy: Unable to generate dummy cert.")
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return ret
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def read_request(self, client_conn):
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line = self.rfile.readline()
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if line == "\r\n" or line == "\n": # Possible leftover from previous message
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line = self.rfile.readline()
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if line == "":
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return None
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method, scheme, host, port, path, httpminor = parse_request_line(line)
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if method == "CONNECT":
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# Discard additional headers sent to the proxy. Should I expose
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# these to users?
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while 1:
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d = self.rfile.readline()
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if d == '\r\n' or d == '\n':
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break
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self.wfile.write(
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'HTTP/1.1 200 Connection established\r\n' +
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('Proxy-agent: %s\r\n'%NAME) +
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'\r\n'
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)
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self.wfile.flush()
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kwargs = dict(
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certfile = self.find_cert(host),
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keyfile = self.config.certfile or self.config.cacert,
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server_side = True,
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ssl_version = ssl.PROTOCOL_SSLv23,
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do_handshake_on_connect = True,
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)
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if sys.version_info[1] > 6:
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kwargs["ciphers"] = self.config.ciphers
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self.connection = ssl.wrap_socket(self.connection, **kwargs)
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self.rfile = FileLike(self.connection)
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self.wfile = FileLike(self.connection)
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method, scheme, host, port, path, httpminor = parse_request_line(self.rfile.readline())
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if scheme is None:
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scheme = "https"
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headers = read_headers(self.rfile)
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if host is None and "host" in headers:
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netloc = headers["host"][0]
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if ':' in netloc:
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host, port = string.split(netloc, ':')
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port = int(port)
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else:
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host = netloc
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if scheme == "https":
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port = 443
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else:
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port = 80
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port = int(port)
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if host is None:
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if self.config.reverse_proxy:
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scheme, host, port = self.config.reverse_proxy
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else:
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# FIXME: We only specify the first part of the invalid request in this error.
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# We should gather up everything read from the socket, and specify it all.
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raise ProxyError(400, 'Invalid request: %s'%line)
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if "expect" in headers:
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expect = ",".join(headers['expect'])
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if expect == "100-continue" and httpminor >= 1:
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self.wfile.write('HTTP/1.1 100 Continue\r\n')
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self.wfile.write('Proxy-agent: %s\r\n'%NAME)
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self.wfile.write('\r\n')
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del headers['expect']
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else:
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raise ProxyError(417, 'Unmet expect: %s'%expect)
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if httpminor == 0:
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client_conn.close = True
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if "connection" in headers:
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for value in ",".join(headers['connection']).split(","):
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value = value.strip()
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if value == "close":
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client_conn.close = True
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if value == "keep-alive":
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client_conn.close = False
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content = read_http_body(self.rfile, client_conn, headers, False, self.config.body_size_limit)
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return flow.Request(client_conn, host, port, scheme, method, path, headers, content)
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def send_response(self, response):
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self.wfile.write(response._assemble())
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self.wfile.flush()
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def terminate(self, connection, wfile, rfile):
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self.request.close()
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try:
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if not getattr(wfile, "closed", False):
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wfile.flush()
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connection.close()
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except IOError:
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pass
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def finish(self):
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self.terminate(self.connection, self.wfile, self.rfile)
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def send_error(self, code, body):
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try:
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import BaseHTTPServer
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response = BaseHTTPServer.BaseHTTPRequestHandler.responses[code][0]
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self.wfile.write("HTTP/1.1 %s %s\r\n" % (code, response))
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self.wfile.write("Server: %s\r\n"%NAME)
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self.wfile.write("Connection: close\r\n")
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self.wfile.write("Content-type: text/html\r\n")
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self.wfile.write("\r\n")
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self.wfile.write('<html><head>\n<title>%d %s</title>\n</head>\n'
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'<body>\n%s\n</body>\n</html>' % (code, response, body))
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self.wfile.flush()
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except:
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pass
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class ProxyServerError(Exception): pass
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ServerBase = SocketServer.ThreadingTCPServer
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ServerBase.daemon_threads = True # Terminate workers when main thread terminates
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class ProxyServer(ServerBase):
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request_queue_size = 20
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allow_reuse_address = True
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def __init__(self, config, port, address=''):
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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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try:
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ServerBase.__init__(self, (address, port), ProxyHandler)
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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.masterq = None
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self.certdir = tempfile.mkdtemp(prefix="mitmproxy")
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config.certdir = self.certdir
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def set_mqueue(self, q):
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self.masterq = q
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def finish_request(self, request, client_address):
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self.RequestHandlerClass(self.config, request, client_address, self, self.masterq)
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def shutdown(self):
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ServerBase.shutdown(self)
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try:
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shutil.rmtree(self.certdir)
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except OSError:
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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 = optparse.OptionGroup(parser, "SSL")
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group.add_option(
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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_option(
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"--ciphers", action="store",
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type = "str", dest="ciphers", default=None,
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help = "SSL ciphers."
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)
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parser.add_option_group(group)
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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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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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utils.dummy_ca(cacert)
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if getattr(options, "cache", None) is not None:
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options.cache = os.path.expanduser(options.cache)
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body_size_limit = utils.parse_size(options.body_size_limit)
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if options.reverse_proxy:
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|
rp = utils.parse_proxy_spec(options.reverse_proxy)
|
|
if not rp:
|
|
parser.error("Invalid reverse proxy specification: %s"%options.reverse_proxy)
|
|
else:
|
|
rp = None
|
|
|
|
return ProxyConfig(
|
|
certfile = options.cert,
|
|
cacert = cacert,
|
|
ciphers = options.ciphers,
|
|
cert_wait_time = options.cert_wait_time,
|
|
body_size_limit = body_size_limit,
|
|
reverse_proxy = rp
|
|
)
|