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an ntlm upstream addon for http \ https (#5100)
* an ntlm upstream addon for http \ https Ntlm upstream proxy for http https all http methods * fix filename * lint! Co-authored-by: Maximilian Hils <git@maximilianhils.com>
This commit is contained in:
Eldad Marciano
GitHub
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3d5f6da048
commit
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185
examples/contrib/ntlm_upstream_proxy.py
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185
examples/contrib/ntlm_upstream_proxy.py
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import base64
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import binascii
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import socket
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import typing
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from mitmproxy import ctx
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from mitmproxy import http, addonmanager
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from mitmproxy.net.http import http1
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from mitmproxy.proxy import layer, commands
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from mitmproxy.proxy.context import Context
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from mitmproxy.proxy.layers.http import HttpConnectUpstreamHook, HttpLayer, HttpStream
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from mitmproxy.proxy.layers.http._upstream_proxy import HttpUpstreamProxy
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from ntlm_auth import gss_channel_bindings, ntlm
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class NTLMUpstreamAuth:
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"""
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This addon handles authentication to systems upstream from us for the
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upstream proxy and reverse proxy mode. There are 3 cases:
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- Upstream proxy CONNECT requests should have authentication added, and
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subsequent already connected requests should not.
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- Upstream proxy regular requests
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- Reverse proxy regular requests (CONNECT is invalid in this mode)
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"""
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def load(self, loader: addonmanager.Loader) -> None:
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ctx.log.info("NTLMUpstreamAuth loader")
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loader.add_option(
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name="upstream_ntlm_auth",
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typespec=typing.Optional[str],
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default=None,
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help="""
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Add HTTP NTLM authentication to upstream proxy requests.
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Format: username:password.
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"""
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)
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loader.add_option(
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name="upstream_ntlm_domain",
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typespec=typing.Optional[str],
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default=None,
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help="""
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Add HTTP NTLM domain for authentication to upstream proxy requests.
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"""
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)
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loader.add_option(
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name="upstream_proxy_address",
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typespec=typing.Optional[str],
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default=None,
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help="""
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upstream poxy address.
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"""
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)
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loader.add_option(
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name="upstream_ntlm_compatibility",
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typespec=int,
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default=3,
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help="""
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Add HTTP NTLM compatibility for authentication to upstream proxy requests.
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Valid values are 0-5 (Default: 3)
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"""
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)
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ctx.log.debug("AddOn: NTLM Upstream Authentication - Loaded")
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def running(self):
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def extract_flow_from_context(context: Context) -> http.HTTPFlow:
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if context and context.layers:
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for l in context.layers:
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if isinstance(l, HttpLayer):
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for _, stream in l.streams.items():
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return stream.flow if isinstance(stream, HttpStream) else None
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def build_connect_flow(context: Context, connect_header: typing.Tuple) -> http.HTTPFlow:
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flow = extract_flow_from_context(context)
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if not flow:
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ctx.log.error("failed to build connect flow")
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raise
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flow.request.content = b"" # we should send empty content for handshake
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header_name, header_value = connect_header
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flow.request.headers.add(header_name, header_value)
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return flow
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def patched_start_handshake(self) -> layer.CommandGenerator[None]:
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assert self.conn.address
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self.ntlm_context = CustomNTLMContext(ctx)
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proxy_authorization = self.ntlm_context.get_ntlm_start_negotiate_message()
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self.flow = build_connect_flow(self.context, ("Proxy-Authorization", proxy_authorization))
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yield HttpConnectUpstreamHook(self.flow)
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raw = http1.assemble_request(self.flow.request)
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yield commands.SendData(self.tunnel_connection, raw)
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def extract_proxy_authenticate_msg(response_head: list) -> str:
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for header in response_head:
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if b'Proxy-Authenticate' in header:
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challenge_message = str(bytes(header).decode('utf-8'))
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try:
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token = challenge_message.split(': ')[1]
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except IndexError:
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ctx.log.error("Failed to extract challenge_message")
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raise
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return token
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def patched_receive_handshake_data(self, data) -> layer.CommandGenerator[typing.Tuple[bool, typing.Optional[str]]]:
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self.buf += data
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response_head = self.buf.maybe_extract_lines()
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if response_head:
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response_head = [bytes(x) for x in response_head]
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try:
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response = http1.read_response_head(response_head)
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except ValueError:
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return True, None
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challenge_message = extract_proxy_authenticate_msg(response_head)
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if 200 <= response.status_code < 300:
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if self.buf:
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yield from self.receive_data(data)
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del self.buf
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return True, None
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else:
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if not challenge_message:
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return True, None
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proxy_authorization = self.ntlm_context.get_ntlm_challenge_response_message(challenge_message)
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self.flow = build_connect_flow(self.context, ("Proxy-Authorization", proxy_authorization))
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raw = http1.assemble_request(self.flow.request)
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yield commands.SendData(self.tunnel_connection, raw)
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return False, None
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else:
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return False, None
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HttpUpstreamProxy.start_handshake = patched_start_handshake
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HttpUpstreamProxy.receive_handshake_data = patched_receive_handshake_data
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def done(self):
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ctx.log.info('close ntlm session')
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addons = [
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NTLMUpstreamAuth()
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]
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class CustomNTLMContext:
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def __init__(self,
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ctx,
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preferred_type: str = 'NTLM',
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cbt_data: gss_channel_bindings.GssChannelBindingsStruct = None):
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# TODO:// take care the cbt_data
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auth: str = ctx.options.upstream_ntlm_auth
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domain: str = str(ctx.options.upstream_ntlm_domain).upper()
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ntlm_compatibility: int = ctx.options.upstream_ntlm_compatibility
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username, password = tuple(auth.split(":"))
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workstation = socket.gethostname().upper()
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ctx.log.debug('\nntlm context with the details: "{}\\{}", *****'.format(domain, username))
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self.ctx_log = ctx.log
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self.preferred_type = preferred_type
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self.ntlm_context = ntlm.NtlmContext(
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username=username,
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password=password,
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domain=domain,
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workstation=workstation,
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ntlm_compatibility=ntlm_compatibility,
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cbt_data=cbt_data)
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def get_ntlm_start_negotiate_message(self) -> str:
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negotiate_message = self.ntlm_context.step()
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negotiate_message_base_64_in_bytes = base64.b64encode(negotiate_message)
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negotiate_message_base_64_ascii = negotiate_message_base_64_in_bytes.decode("ascii")
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negotiate_message_base_64_final = u'%s %s' % (self.preferred_type, negotiate_message_base_64_ascii)
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self.ctx_log.debug(
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f'{self.preferred_type} Authentication, negotiate message: {negotiate_message_base_64_final}'
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)
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return negotiate_message_base_64_final
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def get_ntlm_challenge_response_message(self, challenge_message: str) -> typing.Any:
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challenge_message = challenge_message.replace(self.preferred_type + " ", "", 1)
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try:
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challenge_message_ascii_bytes = base64.b64decode(challenge_message, validate=True)
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except binascii.Error as err:
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self.ctx_log.debug('{} Authentication fail with error {}'.format(self.preferred_type, err.__str__()))
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return False
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authenticate_message = self.ntlm_context.step(challenge_message_ascii_bytes)
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negotiate_message_base_64 = u'%s %s' % (self.preferred_type,
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base64.b64encode(authenticate_message).decode('ascii'))
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self.ctx_log.debug(
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f'{self.preferred_type} Authentication, response to challenge message: {negotiate_message_base_64}'
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)
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return negotiate_message_base_64
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