mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-11-24 00:31:33 +00:00
70 lines
2.3 KiB
Python
70 lines
2.3 KiB
Python
from __future__ import (absolute_import, print_function, division)
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import string
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from libmproxy.protocol2.layer import Kill
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from .rawtcp import RawTcpLayer
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from .tls import TlsLayer
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from .http import Http1Layer, Http2Layer, HttpLayer
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from netlib.http.http2 import HTTP2Protocol
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class RootContext(object):
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"""
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The outmost context provided to the root layer.
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As a consequence, every layer has .client_conn, .channel, .next_layer() and .config.
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"""
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def __init__(self, client_conn, config, channel):
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self.client_conn = client_conn # Client Connection
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self.channel = channel # provides .ask() method to communicate with FlowMaster
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self.config = config # Proxy Configuration
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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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:param top_layer: the current top layer
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:return: The next layer.
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"""
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# TODO: Handle ignore and tcp passthrough
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# TLS ClientHello magic, works for SSLv3, TLSv1.0, TLSv1.1, TLSv1.2
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# http://www.moserware.com/2009/06/first-few-milliseconds-of-https.html#client-hello
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d = top_layer.client_conn.rfile.peek(3)
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is_tls_client_hello = (
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len(d) == 3 and
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d[0] == '\x16' and
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d[1] == '\x03' and
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d[2] in ('\x00', '\x01', '\x02', '\x03')
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)
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d = top_layer.client_conn.rfile.peek(3)
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is_ascii = (
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len(d) == 3 and
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all(x in string.ascii_uppercase for x in d)
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)
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d = top_layer.client_conn.rfile.peek(len(HTTP2Protocol.CLIENT_CONNECTION_PREFACE))
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is_http2_magic = (d == HTTP2Protocol.CLIENT_CONNECTION_PREFACE)
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is_alpn_h2_negotiated = (
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isinstance(top_layer, TlsLayer) and
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top_layer.client_conn.get_alpn_proto_negotiated() == HTTP2Protocol.ALPN_PROTO_H2
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)
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if is_tls_client_hello:
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return TlsLayer(top_layer, True, True)
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elif is_alpn_h2_negotiated or is_http2_magic:
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return Http2Layer(top_layer, 'transparent')
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elif is_ascii:
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return Http1Layer(top_layer, 'transparent')
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else:
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return RawTcpLayer(top_layer)
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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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