mirror of
https://github.com/zhigang1992/mitmproxy.git
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123 lines
4.6 KiB
Python
123 lines
4.6 KiB
Python
from mitmproxy import log
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from mitmproxy import exceptions
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from mitmproxy.proxy import protocol
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from mitmproxy.proxy import modes
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class RootContext:
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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 <mitmproxy.connections.ClientConnection>`.
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channel:
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A :py:class:`~mitmproxy.controller.Channel` to communicate with the FlowMaster.
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Provides :py:meth:`.ask() <mitmproxy.controller.Channel.ask>` and
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:py:meth:`.tell() <mitmproxy.controller.Channel.tell>` methods.
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config:
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The :py:class:`proxy server's configuration <mitmproxy.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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try:
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d = top_layer.client_conn.rfile.peek(3)
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except exceptions.TcpException as e:
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raise exceptions.ProtocolException(str(e))
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client_tls = protocol.is_tls_record_magic(d)
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# 1. check for --ignore
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if self.config.check_ignore:
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ignore = self.config.check_ignore(top_layer.server_conn.address)
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if not ignore and client_tls:
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try:
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client_hello = protocol.TlsClientHello.from_client_conn(self.client_conn)
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except exceptions.TlsProtocolException as e:
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self.log("Cannot parse Client Hello: %s" % repr(e), "error")
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else:
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ignore = self.config.check_ignore((client_hello.sni, 443))
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if ignore:
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return protocol.RawTCPLayer(top_layer, ignore=True)
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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, modes.ReverseProxy):
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return protocol.TlsLayer(top_layer, client_tls, top_layer.server_tls, top_layer.server_conn.address.host)
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if isinstance(top_layer, protocol.ServerConnectionMixin) or isinstance(top_layer, protocol.UpstreamConnectLayer):
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return protocol.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, protocol.TlsLayer):
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if isinstance(top_layer.ctx, modes.HttpProxy):
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return protocol.Http1Layer(top_layer, "regular")
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if isinstance(top_layer.ctx, modes.HttpUpstreamProxy):
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return protocol.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 protocol.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 protocol.RawTCPLayer(top_layer)
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# 5. Check for TLS ALPN (HTTP1/HTTP2)
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if isinstance(top_layer, protocol.TlsLayer):
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alpn = top_layer.client_conn.get_alpn_proto_negotiated()
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if alpn == b'h2':
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return protocol.Http2Layer(top_layer, 'transparent')
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if alpn == b'http/1.1':
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return protocol.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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# expect A-Za-z
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all(65 <= x <= 90 or 97 <= x <= 122 for x in d)
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)
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if self.config.options.rawtcp and not is_ascii:
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return protocol.RawTCPLayer(top_layer)
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# 7. Assume HTTP1 by default
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return protocol.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.LogEntry(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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