mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-11-24 00:31:33 +00:00
830 lines
26 KiB
Python
830 lines
26 KiB
Python
from __future__ import absolute_import
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import Cookie
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import copy
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import threading
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import time
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import urllib
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import urlparse
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from email.utils import parsedate_tz, formatdate, mktime_tz
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import netlib
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from netlib import http, tcp, odict, utils
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from netlib.http import cookies, semantics, http1
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from .tcp import TCPHandler
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from .primitives import KILL, ProtocolHandler, Flow, Error
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from ..proxy.connection import ServerConnection
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from .. import encoding, utils, controller, stateobject, proxy
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HDR_FORM_URLENCODED = "application/x-www-form-urlencoded"
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HDR_FORM_MULTIPART = "multipart/form-data"
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CONTENT_MISSING = 0
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class decoded(object):
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"""
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A context manager that decodes a request or response, and then
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re-encodes it with the same encoding after execution of the block.
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Example:
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with decoded(request):
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request.content = request.content.replace("foo", "bar")
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"""
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def __init__(self, o):
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self.o = o
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ce = o.headers.get_first("content-encoding")
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if ce in encoding.ENCODINGS:
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self.ce = ce
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else:
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self.ce = None
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def __enter__(self):
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if self.ce:
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self.o.decode()
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def __exit__(self, type, value, tb):
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if self.ce:
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self.o.encode(self.ce)
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class MessageMixin(stateobject.StateObject):
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_stateobject_attributes = dict(
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httpversion=tuple,
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headers=odict.ODictCaseless,
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body=str,
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timestamp_start=float,
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timestamp_end=float
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)
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_stateobject_long_attributes = {"body"}
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def get_state(self, short=False):
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ret = super(MessageMixin, self).get_state(short)
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if short:
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if self.body:
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ret["contentLength"] = len(self.body)
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elif self.body == CONTENT_MISSING:
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ret["contentLength"] = None
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else:
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ret["contentLength"] = 0
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return ret
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def get_decoded_content(self):
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"""
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Returns the decoded content based on the current Content-Encoding
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header.
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Doesn't change the message iteself or its headers.
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"""
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ce = self.headers.get_first("content-encoding")
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if not self.body or ce not in encoding.ENCODINGS:
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return self.body
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return encoding.decode(ce, self.body)
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def decode(self):
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"""
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Decodes body based on the current Content-Encoding header, then
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removes the header. If there is no Content-Encoding header, no
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action is taken.
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Returns True if decoding succeeded, False otherwise.
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"""
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ce = self.headers.get_first("content-encoding")
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if not self.body or ce not in encoding.ENCODINGS:
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return False
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data = encoding.decode(ce, self.body)
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if data is None:
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return False
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self.body = data
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del self.headers["content-encoding"]
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return True
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def encode(self, e):
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"""
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Encodes body with the encoding e, where e is "gzip", "deflate"
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or "identity".
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"""
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# FIXME: Error if there's an existing encoding header?
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self.body = encoding.encode(e, self.body)
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self.headers["content-encoding"] = [e]
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def size(self, **kwargs):
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"""
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Size in bytes of a fully rendered message, including headers and
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HTTP lead-in.
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"""
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hl = len(self._assemble_head(**kwargs))
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if self.body:
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return hl + len(self.body)
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else:
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return hl
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def copy(self):
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c = copy.copy(self)
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c.headers = self.headers.copy()
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return c
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def replace(self, pattern, repl, *args, **kwargs):
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"""
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Replaces a regular expression pattern with repl in both the headers
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and the body of the message. Encoded body will be decoded
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before replacement, and re-encoded afterwards.
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Returns the number of replacements made.
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"""
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with decoded(self):
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self.body, c = utils.safe_subn(
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pattern, repl, self.body, *args, **kwargs
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)
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c += self.headers.replace(pattern, repl, *args, **kwargs)
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return c
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def _assemble_first_line(self):
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"""
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Returns the assembled request/response line
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"""
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raise NotImplementedError() # pragma: nocover
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def _assemble_headers(self):
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"""
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Returns the assembled headers
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"""
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raise NotImplementedError() # pragma: nocover
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def _assemble_head(self):
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"""
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Returns the assembled request/response line plus headers
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"""
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raise NotImplementedError() # pragma: nocover
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def assemble(self):
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"""
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Returns the assembled request/response
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"""
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raise NotImplementedError() # pragma: nocover
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class HTTPRequest(MessageMixin, semantics.Request):
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"""
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An HTTP request.
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Exposes the following attributes:
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method: HTTP method
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scheme: URL scheme (http/https)
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host: Target hostname of the request. This is not neccessarily the
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directy upstream server (which could be another proxy), but it's always
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the target server we want to reach at the end. This attribute is either
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inferred from the request itself (absolute-form, authority-form) or from
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the connection metadata (e.g. the host in reverse proxy mode).
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port: Destination port
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path: Path portion of the URL (not present in authority-form)
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httpversion: HTTP version tuple, e.g. (1,1)
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headers: odict.ODictCaseless object
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content: Content of the request, None, or CONTENT_MISSING if there
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is content associated, but not present. CONTENT_MISSING evaluates
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to False to make checking for the presence of content natural.
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form_in: The request form which mitmproxy has received. The following
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values are possible:
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- relative (GET /index.html, OPTIONS *) (covers origin form and
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asterisk form)
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- absolute (GET http://example.com:80/index.html)
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- authority-form (CONNECT example.com:443)
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Details: http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-25#section-5.3
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form_out: The request form which mitmproxy will send out to the
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destination
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timestamp_start: Timestamp indicating when request transmission started
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timestamp_end: Timestamp indicating when request transmission ended
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"""
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def __init__(
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self,
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form_in,
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method,
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scheme,
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host,
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port,
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path,
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httpversion,
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headers,
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body,
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timestamp_start=None,
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timestamp_end=None,
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form_out=None,
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):
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semantics.Request.__init__(
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self,
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form_in,
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method,
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scheme,
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host,
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port,
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path,
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httpversion,
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headers,
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body,
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timestamp_start,
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timestamp_end,
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)
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self.form_out = form_out or form_in
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# Have this request's cookies been modified by sticky cookies or auth?
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self.stickycookie = False
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self.stickyauth = False
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# Is this request replayed?
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self.is_replay = False
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_stateobject_attributes = MessageMixin._stateobject_attributes.copy()
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_stateobject_attributes.update(
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form_in=str,
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method=str,
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scheme=str,
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host=str,
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port=int,
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path=str,
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form_out=str,
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is_replay=bool
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)
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# This list is adopted legacy code.
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# We probably don't need to strip off keep-alive.
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_headers_to_strip_off = ['Proxy-Connection',
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'Keep-Alive',
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'Connection',
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'Transfer-Encoding',
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'Upgrade']
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@classmethod
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def from_state(cls, state):
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f = cls(
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None,
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None,
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None,
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None,
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None,
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None,
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None,
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None,
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None,
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None,
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None)
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f.load_state(state)
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return f
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def __repr__(self):
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return "<HTTPRequest: {0}>".format(
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self._assemble_first_line(self.form_in)[:-9]
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)
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@classmethod
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def from_protocol(
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self,
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protocol,
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include_body=True,
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body_size_limit=None,
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):
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req = protocol.read_request(
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include_body = include_body,
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body_size_limit = body_size_limit,
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)
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return HTTPRequest(
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req.form_in,
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req.method,
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req.scheme,
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req.host,
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req.port,
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req.path,
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req.httpversion,
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req.headers,
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req.body,
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req.timestamp_start,
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req.timestamp_end,
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)
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def _assemble_first_line(self, form=None):
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form = form or self.form_out
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if form == "relative":
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request_line = '%s %s HTTP/%s.%s' % (
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self.method, self.path, self.httpversion[0], self.httpversion[1]
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)
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elif form == "authority":
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request_line = '%s %s:%s HTTP/%s.%s' % (
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self.method, self.host, self.port, self.httpversion[0],
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self.httpversion[1]
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)
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elif form == "absolute":
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request_line = '%s %s://%s:%s%s HTTP/%s.%s' % (
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self.method, self.scheme, self.host,
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self.port, self.path, self.httpversion[0],
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self.httpversion[1]
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)
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else:
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raise http.HttpError(400, "Invalid request form")
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return request_line
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def _assemble_headers(self):
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headers = self.headers.copy()
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for k in self._headers_to_strip_off:
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del headers[k]
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if 'host' not in headers and self.scheme and self.host and self.port:
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headers["Host"] = [utils.hostport(self.scheme,
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self.host,
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self.port)]
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# If content is defined (i.e. not None or CONTENT_MISSING), we always
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# add a content-length header.
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if self.body or self.body == "":
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headers["Content-Length"] = [str(len(self.body))]
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return headers.format()
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def _assemble_head(self, form=None):
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return "%s\r\n%s\r\n" % (
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self._assemble_first_line(form), self._assemble_headers()
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)
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def assemble(self, form=None):
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"""
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Assembles the request for transmission to the server. We make some
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modifications to make sure interception works properly.
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Raises an Exception if the request cannot be assembled.
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"""
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if self.body == CONTENT_MISSING:
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raise proxy.ProxyError(
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502,
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"Cannot assemble flow with CONTENT_MISSING"
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)
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head = self._assemble_head(form)
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if self.body:
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return head + self.body
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else:
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return head
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def __hash__(self):
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return id(self)
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def anticache(self):
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"""
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Modifies this request to remove headers that might produce a cached
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response. That is, we remove ETags and If-Modified-Since headers.
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"""
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delheaders = [
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"if-modified-since",
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"if-none-match",
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]
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for i in delheaders:
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del self.headers[i]
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def anticomp(self):
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"""
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Modifies this request to remove headers that will compress the
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resource's data.
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"""
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self.headers["accept-encoding"] = ["identity"]
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def constrain_encoding(self):
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"""
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Limits the permissible Accept-Encoding values, based on what we can
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decode appropriately.
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"""
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if self.headers["accept-encoding"]:
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self.headers["accept-encoding"] = [
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', '.join(
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e for e in encoding.ENCODINGS if e in self.headers["accept-encoding"][0])]
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def update_host_header(self):
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"""
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Update the host header to reflect the current target.
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"""
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self.headers["Host"] = [self.host]
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def get_form(self):
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"""
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Retrieves the URL-encoded or multipart form data, returning an ODict object.
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Returns an empty ODict if there is no data or the content-type
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indicates non-form data.
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"""
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if self.body:
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if self.headers.in_any("content-type", HDR_FORM_URLENCODED, True):
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return self.get_form_urlencoded()
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elif self.headers.in_any("content-type", HDR_FORM_MULTIPART, True):
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return self.get_form_multipart()
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return odict.ODict([])
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def get_form_urlencoded(self):
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"""
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Retrieves the URL-encoded form data, returning an ODict object.
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Returns an empty ODict if there is no data or the content-type
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indicates non-form data.
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"""
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if self.body and self.headers.in_any(
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"content-type",
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HDR_FORM_URLENCODED,
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True):
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return odict.ODict(utils.urldecode(self.body))
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return odict.ODict([])
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def get_form_multipart(self):
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if self.body and self.headers.in_any(
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"content-type",
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HDR_FORM_MULTIPART,
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True):
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return odict.ODict(
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utils.multipartdecode(
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self.headers,
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self.body))
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return odict.ODict([])
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def set_form_urlencoded(self, odict):
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"""
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Sets the body to the URL-encoded form data, and adds the
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appropriate content-type header. Note that this will destory the
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existing body if there is one.
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"""
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# FIXME: If there's an existing content-type header indicating a
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# url-encoded form, leave it alone.
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self.headers["Content-Type"] = [HDR_FORM_URLENCODED]
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self.body = utils.urlencode(odict.lst)
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def get_path_components(self):
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"""
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Returns the path components of the URL as a list of strings.
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Components are unquoted.
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"""
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_, _, path, _, _, _ = urlparse.urlparse(self.url)
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return [urllib.unquote(i) for i in path.split("/") if i]
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def set_path_components(self, lst):
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"""
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Takes a list of strings, and sets the path component of the URL.
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Components are quoted.
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"""
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lst = [urllib.quote(i, safe="") for i in lst]
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path = "/" + "/".join(lst)
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scheme, netloc, _, params, query, fragment = urlparse.urlparse(self.url)
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self.url = urlparse.urlunparse(
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[scheme, netloc, path, params, query, fragment]
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)
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def get_query(self):
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"""
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Gets the request query string. Returns an ODict object.
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"""
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_, _, _, _, query, _ = urlparse.urlparse(self.url)
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if query:
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return odict.ODict(utils.urldecode(query))
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return odict.ODict([])
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def set_query(self, odict):
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"""
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Takes an ODict object, and sets the request query string.
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"""
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scheme, netloc, path, params, _, fragment = urlparse.urlparse(self.url)
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query = utils.urlencode(odict.lst)
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self.url = urlparse.urlunparse(
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[scheme, netloc, path, params, query, fragment]
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)
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def pretty_host(self, hostheader):
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"""
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Heuristic to get the host of the request.
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Note that pretty_host() does not always return the TCP destination
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of the request, e.g. if an upstream proxy is in place
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If hostheader is set to True, the Host: header will be used as
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additional (and preferred) data source. This is handy in
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transparent mode, where only the IO of the destination is known,
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but not the resolved name. This is disabled by default, as an
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attacker may spoof the host header to confuse an analyst.
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"""
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host = None
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if hostheader:
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host = self.headers.get_first("host")
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if not host:
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host = self.host
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if host:
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try:
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return host.encode("idna")
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except ValueError:
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return host
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else:
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return None
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def pretty_url(self, hostheader):
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if self.form_out == "authority": # upstream proxy mode
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return "%s:%s" % (self.pretty_host(hostheader), self.port)
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return utils.unparse_url(self.scheme,
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self.pretty_host(hostheader),
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self.port,
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self.path).encode('ascii')
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@property
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def url(self):
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"""
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Returns a URL string, constructed from the Request's URL components.
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"""
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return utils.unparse_url(
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self.scheme,
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self.host,
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self.port,
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self.path
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).encode('ascii')
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@url.setter
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def url(self, url):
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"""
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Parses a URL specification, and updates the Request's information
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accordingly.
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Returns False if the URL was invalid, True if the request succeeded.
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"""
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parts = http.parse_url(url)
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if not parts:
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raise ValueError("Invalid URL: %s" % url)
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self.scheme, self.host, self.port, self.path = parts
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def get_cookies(self):
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"""
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Returns a possibly empty netlib.odict.ODict object.
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"""
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ret = odict.ODict()
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|
for i in self.headers["cookie"]:
|
|
ret.extend(cookies.parse_cookie_header(i))
|
|
return ret
|
|
|
|
def set_cookies(self, odict):
|
|
"""
|
|
Takes an netlib.odict.ODict object. Over-writes any existing Cookie
|
|
headers.
|
|
"""
|
|
v = cookies.format_cookie_header(odict)
|
|
self.headers["Cookie"] = [v]
|
|
|
|
def replace(self, pattern, repl, *args, **kwargs):
|
|
"""
|
|
Replaces a regular expression pattern with repl in the headers, the
|
|
request path and the body of the request. Encoded content will be
|
|
decoded before replacement, and re-encoded afterwards.
|
|
|
|
Returns the number of replacements made.
|
|
"""
|
|
c = MessageMixin.replace(self, pattern, repl, *args, **kwargs)
|
|
self.path, pc = utils.safe_subn(
|
|
pattern, repl, self.path, *args, **kwargs
|
|
)
|
|
c += pc
|
|
return c
|
|
|
|
|
|
class HTTPResponse(MessageMixin, semantics.Response):
|
|
"""
|
|
An HTTP response.
|
|
|
|
Exposes the following attributes:
|
|
|
|
httpversion: HTTP version tuple, e.g. (1, 0), (1, 1), or (2, 0)
|
|
|
|
status_code: HTTP response status code
|
|
|
|
msg: HTTP response message
|
|
|
|
headers: ODict Caseless object
|
|
|
|
content: Content of the request, None, or CONTENT_MISSING if there
|
|
is content associated, but not present. CONTENT_MISSING evaluates
|
|
to False to make checking for the presence of content natural.
|
|
|
|
timestamp_start: Timestamp indicating when request transmission started
|
|
|
|
timestamp_end: Timestamp indicating when request transmission ended
|
|
"""
|
|
|
|
def __init__(
|
|
self,
|
|
httpversion,
|
|
status_code,
|
|
msg,
|
|
headers,
|
|
body,
|
|
timestamp_start=None,
|
|
timestamp_end=None,
|
|
):
|
|
semantics.Response.__init__(
|
|
self,
|
|
httpversion,
|
|
status_code,
|
|
msg,
|
|
headers,
|
|
body,
|
|
timestamp_start=timestamp_start,
|
|
timestamp_end=timestamp_end,
|
|
)
|
|
|
|
# Is this request replayed?
|
|
self.is_replay = False
|
|
self.stream = False
|
|
|
|
_stateobject_attributes = MessageMixin._stateobject_attributes.copy()
|
|
_stateobject_attributes.update(
|
|
code=int,
|
|
msg=str
|
|
)
|
|
|
|
_headers_to_strip_off = ['Proxy-Connection',
|
|
'Alternate-Protocol',
|
|
'Alt-Svc']
|
|
|
|
|
|
@classmethod
|
|
def from_state(cls, state):
|
|
f = cls(None, None, None, None, None)
|
|
f.load_state(state)
|
|
return f
|
|
|
|
def __repr__(self):
|
|
if self.body:
|
|
size = netlib.utils.pretty_size(len(self.body))
|
|
else:
|
|
size = "content missing"
|
|
return "<HTTPResponse: {status_code} {msg} ({contenttype}, {size})>".format(
|
|
status_code=self.status_code,
|
|
msg=self.msg,
|
|
contenttype=self.headers.get_first(
|
|
"content-type", "unknown content type"
|
|
),
|
|
size=size
|
|
)
|
|
|
|
@classmethod
|
|
def from_protocol(
|
|
self,
|
|
protocol,
|
|
request_method,
|
|
include_body=True,
|
|
body_size_limit=None
|
|
):
|
|
resp = protocol.read_response(
|
|
request_method,
|
|
body_size_limit,
|
|
include_body=include_body
|
|
)
|
|
|
|
return HTTPResponse(
|
|
resp.httpversion,
|
|
resp.status_code,
|
|
resp.msg,
|
|
resp.headers,
|
|
resp.body,
|
|
resp.timestamp_start,
|
|
resp.timestamp_end,
|
|
)
|
|
|
|
def _assemble_first_line(self):
|
|
return 'HTTP/%s.%s %s %s' % \
|
|
(self.httpversion[0], self.httpversion[1], self.code, self.msg)
|
|
|
|
def _assemble_headers(self, preserve_transfer_encoding=False):
|
|
headers = self.headers.copy()
|
|
for k in self._headers_to_strip_off:
|
|
del headers[k]
|
|
if not preserve_transfer_encoding:
|
|
del headers['Transfer-Encoding']
|
|
|
|
# If body is defined (i.e. not None or CONTENT_MISSING), we always
|
|
# add a content-length header.
|
|
if self.body or self.body == "":
|
|
headers["Content-Length"] = [str(len(self.body))]
|
|
|
|
return headers.format()
|
|
|
|
def _assemble_head(self, preserve_transfer_encoding=False):
|
|
return '%s\r\n%s\r\n' % (
|
|
self._assemble_first_line(),
|
|
self._assemble_headers(
|
|
preserve_transfer_encoding=preserve_transfer_encoding
|
|
)
|
|
)
|
|
|
|
def assemble(self):
|
|
"""
|
|
Assembles the response for transmission to the client. We make some
|
|
modifications to make sure interception works properly.
|
|
|
|
Raises an Exception if the request cannot be assembled.
|
|
"""
|
|
if self.body == CONTENT_MISSING:
|
|
raise proxy.ProxyError(
|
|
502,
|
|
"Cannot assemble flow with CONTENT_MISSING"
|
|
)
|
|
head = self._assemble_head()
|
|
if self.body:
|
|
return head + self.body
|
|
else:
|
|
return head
|
|
|
|
def _refresh_cookie(self, c, delta):
|
|
"""
|
|
Takes a cookie string c and a time delta in seconds, and returns
|
|
a refreshed cookie string.
|
|
"""
|
|
c = Cookie.SimpleCookie(str(c))
|
|
for i in c.values():
|
|
if "expires" in i:
|
|
d = parsedate_tz(i["expires"])
|
|
if d:
|
|
d = mktime_tz(d) + delta
|
|
i["expires"] = formatdate(d)
|
|
else:
|
|
# This can happen when the expires tag is invalid.
|
|
# reddit.com sends a an expires tag like this: "Thu, 31 Dec
|
|
# 2037 23:59:59 GMT", which is valid RFC 1123, but not
|
|
# strictly correct according to the cookie spec. Browsers
|
|
# appear to parse this tolerantly - maybe we should too.
|
|
# For now, we just ignore this.
|
|
del i["expires"]
|
|
return c.output(header="").strip()
|
|
|
|
def refresh(self, now=None):
|
|
"""
|
|
This fairly complex and heuristic function refreshes a server
|
|
response for replay.
|
|
|
|
- It adjusts date, expires and last-modified headers.
|
|
- It adjusts cookie expiration.
|
|
"""
|
|
if not now:
|
|
now = time.time()
|
|
delta = now - self.timestamp_start
|
|
refresh_headers = [
|
|
"date",
|
|
"expires",
|
|
"last-modified",
|
|
]
|
|
for i in refresh_headers:
|
|
if i in self.headers:
|
|
d = parsedate_tz(self.headers[i][0])
|
|
if d:
|
|
new = mktime_tz(d) + delta
|
|
self.headers[i] = [formatdate(new)]
|
|
c = []
|
|
for i in self.headers["set-cookie"]:
|
|
c.append(self._refresh_cookie(i, delta))
|
|
if c:
|
|
self.headers["set-cookie"] = c
|
|
|
|
def get_cookies(self):
|
|
"""
|
|
Get the contents of all Set-Cookie headers.
|
|
|
|
Returns a possibly empty ODict, where keys are cookie name strings,
|
|
and values are [value, attr] lists. Value is a string, and attr is
|
|
an ODictCaseless containing cookie attributes. Within attrs, unary
|
|
attributes (e.g. HTTPOnly) are indicated by a Null value.
|
|
"""
|
|
ret = []
|
|
for header in self.headers["set-cookie"]:
|
|
v = http.cookies.parse_set_cookie_header(header)
|
|
if v:
|
|
name, value, attrs = v
|
|
ret.append([name, [value, attrs]])
|
|
return odict.ODict(ret)
|
|
|
|
def set_cookies(self, odict):
|
|
"""
|
|
Set the Set-Cookie headers on this response, over-writing existing
|
|
headers.
|
|
|
|
Accepts an ODict of the same format as that returned by get_cookies.
|
|
"""
|
|
values = []
|
|
for i in odict.lst:
|
|
values.append(
|
|
http.cookies.format_set_cookie_header(
|
|
i[0],
|
|
i[1][0],
|
|
i[1][1]
|
|
)
|
|
)
|
|
self.headers["Set-Cookie"] = values
|