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ProxyEPA

Proxy NTLM EPA authentication against webservers The easy proxy to handle your NTLM EPA authentication against webservers.

Installation

  1. Install the dependancies
$ # In a venv
$ python3 -m venv venv
$ source venv/bin/activate
$ python3 -m pip install -r requirements.txt
  1. Enjoy.

Usage

Quickstart

Run like that, it will try to authenticate with the credentials default_user:default_password:

python3 proxy.py -du default_user -dp default_password

With BurpSuite

In order to work with burpsuite, disable HTTP/2 support (Project options -> HTTP -> HTTP/2 -> uncheck Enable HTTP/2) and uncheck Set "Connection close" on incoming requests as NTLM authenticate a TCP connection. Afterwards, you just have to specify an upstream proxy in burp, so that it uses this proxy for the host you cannot authenticate with (in Project options -> Connections -> Upstream Proxy Servers -> click Add -> specify the remote hostname that is causing problems with NTLM authentication, the proxy host and port configured in the tool and leave the Authentication type to None). You may also need to disable the socks proxy if enabled.

Help

$ python3 proxy.py -h
usage: proxy.py [-h] [--listen-address LISTEN_ADDRESS] [--listen-port LISTEN_PORT] [--cacert CACERT] [--cakey CAKEY] [--cakey-pass CAKEY_PASS] [--certsdir CERTSDIR] [--singleprocess] [--debug] [--creds CREDS]
                [--default_username DEFAULT_USERNAME] [--default_password DEFAULT_PASSWORD] [--kerberos] [--dcip DCIP]

Simple HTTP proxy that support NTLM EPA.

optional arguments:
  -h, --help            show this help message and exit
  --listen-address LISTEN_ADDRESS, -l LISTEN_ADDRESS
                        Address the proxy will be listening on, defaults to 127.0.0.1.
  --listen-port LISTEN_PORT, -p LISTEN_PORT
                        Port the proxy will be listening on, defaults to 3128.
  --cacert CACERT       Filepath to the CA certificate, defaults to ./cacert.pem. Will be created if it does not exists.
  --cakey CAKEY         Filepath to the CA private key, defaults to ./cakey.pem. Will be created if it does not exists.
  --cakey-pass CAKEY_PASS
                        CA private key passphrase.
  --certsdir CERTSDIR   Path to the directory the generated certificates will be stored in, defaults to /tmp/Prox-Ez. Will be created if it does not exists.
  --singleprocess, -sp  Do you want to be slowwwww ?! Actually useful during debug.
  --debug, -d           Increase debug output.
  --creds CREDS         Path to the credentials file, for instance: { "my.hostname.com": { "username": "domain\user", "password": "password" }, "my.second.hostname.com": { "username": "domain1\user1", "password": "password1" } }
  --default_username DEFAULT_USERNAME, -du DEFAULT_USERNAME
                        Default username to use. In the form domain\\user.
  --default_password DEFAULT_PASSWORD, -dp DEFAULT_PASSWORD
                        Default password to use.
  --kerberos, -k        Enable kerberos authentication instead of NTLM
  --dcip DCIP           IP Address of the domain controller (only for kerberos)

Known issues

  • No support for websocket. It will yield assertion errors such as:
DEBUG:Proxy.ProxyToServerHelper:Our state: MIGHT_SWITCH_PROTOCOL; their state: SEND_RESPONSE
[...]
    assert self.conn.our_state in [h11.DONE, h11.MUST_CLOSE, h11.CLOSED] and self.conn.their_state is h11.SEND_RESPONSE
AssertionError