mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-12-18 08:44:25 +00:00
70 lines
2.3 KiB
Python
70 lines
2.3 KiB
Python
from __future__ import (absolute_import, print_function, division)
|
|
import string
|
|
|
|
from libmproxy.protocol2.layer import Kill
|
|
from .rawtcp import RawTcpLayer
|
|
from .tls import TlsLayer
|
|
from .http import Http1Layer, Http2Layer, HttpLayer
|
|
|
|
from netlib.http.http2 import HTTP2Protocol
|
|
|
|
class RootContext(object):
|
|
"""
|
|
The outmost context provided to the root layer.
|
|
As a consequence, every layer has .client_conn, .channel, .next_layer() and .config.
|
|
"""
|
|
|
|
def __init__(self, client_conn, config, channel):
|
|
self.client_conn = client_conn # Client Connection
|
|
self.channel = channel # provides .ask() method to communicate with FlowMaster
|
|
self.config = config # Proxy Configuration
|
|
|
|
def next_layer(self, top_layer):
|
|
"""
|
|
This function determines the next layer in the protocol stack.
|
|
:param top_layer: the current top layer
|
|
:return: The next layer.
|
|
"""
|
|
|
|
# TODO: Handle ignore and tcp passthrough
|
|
|
|
# TLS ClientHello magic, works for SSLv3, TLSv1.0, TLSv1.1, TLSv1.2
|
|
# http://www.moserware.com/2009/06/first-few-milliseconds-of-https.html#client-hello
|
|
d = top_layer.client_conn.rfile.peek(3)
|
|
is_tls_client_hello = (
|
|
len(d) == 3 and
|
|
d[0] == '\x16' and
|
|
d[1] == '\x03' and
|
|
d[2] in ('\x00', '\x01', '\x02', '\x03')
|
|
)
|
|
|
|
d = top_layer.client_conn.rfile.peek(3)
|
|
is_ascii = (
|
|
len(d) == 3 and
|
|
all(x in string.ascii_uppercase for x in d)
|
|
)
|
|
|
|
d = top_layer.client_conn.rfile.peek(len(HTTP2Protocol.CLIENT_CONNECTION_PREFACE))
|
|
is_http2_magic = (d == HTTP2Protocol.CLIENT_CONNECTION_PREFACE)
|
|
|
|
is_alpn_h2_negotiated = (
|
|
isinstance(top_layer, TlsLayer) and
|
|
top_layer.client_conn.get_alpn_proto_negotiated() == HTTP2Protocol.ALPN_PROTO_H2
|
|
)
|
|
|
|
if is_tls_client_hello:
|
|
return TlsLayer(top_layer, True, True)
|
|
elif is_alpn_h2_negotiated or is_http2_magic:
|
|
return Http2Layer(top_layer, 'transparent')
|
|
elif is_ascii:
|
|
return Http1Layer(top_layer, 'transparent')
|
|
else:
|
|
return RawTcpLayer(top_layer)
|
|
|
|
@property
|
|
def layers(self):
|
|
return []
|
|
|
|
def __repr__(self):
|
|
return "RootContext"
|