mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-11-23 16:17:49 +00:00
130 lines
4.4 KiB
Python
130 lines
4.4 KiB
Python
from __future__ import (absolute_import, print_function, division)
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import string
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import sys
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import six
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from libmproxy.exceptions import ProtocolException
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from netlib.http.http1 import HTTP1Protocol
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from netlib.http.http2 import HTTP2Protocol
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from netlib.tcp import NetLibError
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from ..protocol import (
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RawTCPLayer, TlsLayer, Http1Layer, Http2Layer, is_tls_record_magic, ServerConnectionMixin
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)
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from .modes import HttpProxy, HttpUpstreamProxy, ReverseProxy
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class RootContext(object):
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"""
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The outermost context provided to the root layer.
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As a consequence, every layer has access to methods and attributes defined here.
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Attributes:
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client_conn:
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The :py:class:`client connection <libmproxy.models.ClientConnection>`.
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channel:
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A :py:class:`~libmproxy.controller.Channel` to communicate with the FlowMaster.
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Provides :py:meth:`.ask() <libmproxy.controller.Channel.ask>` and
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:py:meth:`.tell() <libmproxy.controller.Channel.tell>` methods.
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config:
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The :py:class:`proxy server's configuration <libmproxy.proxy.ProxyConfig>`
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"""
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def __init__(self, client_conn, config, channel):
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self.client_conn = client_conn
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self.channel = channel
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self.config = config
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def next_layer(self, top_layer):
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"""
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This function determines the next layer in the protocol stack.
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Arguments:
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top_layer: the current innermost layer.
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Returns:
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The next layer
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"""
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layer = self._next_layer(top_layer)
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return self.channel.ask("next_layer", layer)
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def _next_layer(self, top_layer):
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# 1. Check for --ignore.
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if self.config.check_ignore(top_layer.server_conn.address):
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return RawTCPLayer(top_layer, logging=False)
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try:
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d = top_layer.client_conn.rfile.peek(3)
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except NetLibError as e:
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six.reraise(ProtocolException, ProtocolException(str(e)), sys.exc_info()[2])
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client_tls = is_tls_record_magic(d)
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# 2. Always insert a TLS layer, even if there's neither client nor server tls.
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# An inline script may upgrade from http to https,
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# in which case we need some form of TLS layer.
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if isinstance(top_layer, ReverseProxy):
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return TlsLayer(top_layer, client_tls, top_layer.server_tls)
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if isinstance(top_layer, ServerConnectionMixin):
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return TlsLayer(top_layer, client_tls, client_tls)
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# 3. In Http Proxy mode and Upstream Proxy mode, the next layer is fixed.
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if isinstance(top_layer, TlsLayer):
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if isinstance(top_layer.ctx, HttpProxy):
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return Http1Layer(top_layer, "regular")
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if isinstance(top_layer.ctx, HttpUpstreamProxy):
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return Http1Layer(top_layer, "upstream")
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# 4. Check for other TLS cases (e.g. after CONNECT).
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if client_tls:
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return TlsLayer(top_layer, True, True)
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# 4. Check for --tcp
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if self.config.check_tcp(top_layer.server_conn.address):
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return RawTCPLayer(top_layer)
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# 5. Check for TLS ALPN (HTTP1/HTTP2)
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if isinstance(top_layer, TlsLayer):
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alpn = top_layer.client_conn.get_alpn_proto_negotiated()
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if alpn == HTTP2Protocol.ALPN_PROTO_H2:
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return Http2Layer(top_layer, 'transparent')
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if alpn == HTTP1Protocol.ALPN_PROTO_HTTP1:
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return Http1Layer(top_layer, 'transparent')
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# 6. Check for raw tcp mode
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is_ascii = (
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len(d) == 3 and
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# better be safe here and don't expect uppercase...
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all(x in string.ascii_letters for x in d)
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)
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if self.config.rawtcp and not is_ascii:
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return RawTCPLayer(top_layer)
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# 7. Assume HTTP1 by default
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return Http1Layer(top_layer, 'transparent')
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def log(self, msg, level, subs=()):
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"""
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Send a log message to the master.
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"""
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full_msg = [
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"{}: {}".format(repr(self.client_conn.address), msg)
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]
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for i in subs:
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full_msg.append(" -> " + i)
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full_msg = "\n".join(full_msg)
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self.channel.tell("log", Log(full_msg, level))
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@property
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def layers(self):
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return []
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def __repr__(self):
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return "RootContext"
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class Log(object):
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def __init__(self, msg, level="info"):
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self.msg = msg
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self.level = level
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