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improve next_layer detection

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This commit is contained in:
Thomas Kriechbaumer 2015-08-19 15:23:52 +02:00
parent 9bae97eb17
commit c9fa8491cc
2 changed files with 20 additions and 13 deletions
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29
libmproxy/protocol2/root_context.py
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@ -6,6 +6,7 @@ from .rawtcp import RawTcpLayer
from .tls import TlsLayer
from .http import Http1Layer, Http2Layer, HttpLayer
from netlib.http.http2 import HTTP2Protocol
class RootContext(object):
"""
@ -25,11 +26,11 @@ class RootContext(object):
:return: The next layer.
"""
d = top_layer.client_conn.rfile.peek(3)
# TODO: Handle ignore and tcp passthrough
# TLS ClientHello magic, see http://www.moserware.com/2009/06/first-few-milliseconds-of-https.html#client-hello
# 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
@ -37,20 +38,26 @@ class RootContext(object):
d[2] in ('\x00', '\x01', '\x02', '\x03')
)
is_ascii = all(x in string.ascii_uppercase for x in d)
d = top_layer.client_conn.rfile.peek(3)
is_ascii = (
len(d) == 3 and
all(x in string.ascii_uppercase for x in d)
)
# TODO: build is_http2_magic check here, maybe this is an easy way to detect h2c
d = top_layer.client_conn.rfile.peek(len(HTTP2Protocol.CLIENT_CONNECTION_PREFACE))
is_http2_magic = (d == HTTP2Protocol.CLIENT_CONNECTION_PREFACE)
if not d:
return iter([])
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 isinstance(top_layer, TlsLayer) and is_ascii:
if top_layer.client_conn.get_alpn_proto_negotiated() == 'h2':
elif is_alpn_h2_negotiated or is_http2_magic:
return Http2Layer(top_layer, 'transparent')
else:
return Http1Layer(top_layer, "transparent")
elif is_ascii:
return Http1Layer(top_layer, 'transparent')
else:
return RawTcpLayer(top_layer)