Copyright (C) 2015 by Martin Gallo, Core Security

The library was designed and developed by Martin Gallo from the Security Consulting Services team of Core Security.

Version 0.1.7 (May 2015)

SAP Netweaver [1] is a technology platform for building and integrating SAP business applications. Communication between components uses different network protocols. While some of them are standard and well-known protocols, others are proprietaries and public information is not available.

This Python library provides modules for crafting and sending packets using SAP's NI, Message Server, Router, RFC, SNC, Enqueue and Diag protocols. The modules are based on Scapy [2] and are based on information acquired at researching the different protocols and services. Detailed information about the research can be found at [3], [4], [5], [6] and [7].

This tool counts with the following components:

• SAPNI module

  Scapy class for the SAP NI (Network Interface protocol). It also includes a Stream Socket implementation for the SAP NI protocol, as well as a base proxy and server implementations.

• SAPDiag module

  Contain Scapy classes for craft and dissect Diag DP headers, Diag packets and items. The main class is SAPDiag, that is in charge of handling compression/decompression of payload items and serve as a container for them.

• SAPDiagItems module

  Some classes for craft and dissect common Diag items.

• SAPDiagClient module

  Basic class for establishing a connection with an application server.

• SAPEnqueue module

  Scapy classes for the Enqueue protocol.

• SAPRouter module

  Scapy classes for the different SAP Router packets (route, control, error and admin messages).

• SAPMS module

  Scapy classes for the Message Server protocol.

• SAPSNC module

  Basic class to serve as container of SNC Frames found in SAP Router and SAP Diag packets.

• Examples

  Example and proof of concept scripts to illustrate the use of the different modules and protocols: login brute force, gather information on the application server, intercept communications, a rogue Diag server implementation, test of Denial of Server issues [4], a Message Server monitor implementation, listener/messager for Message Server, SAP Router internal networks scanner and port forwarder, etc.

Installing pysap is simple with pip, just run the following command on a terminal:

$ pip install pysap

Some example scripts has additional required libraries:

tabulate
netaddr
wxPython (http://www.wxpython.org/)
fau_timer (https://code.google.com/p/fau-timer/)

Some of those extra libraries can be installed with pip running the following command:

$ pip install pysap[examples] 

The tool relays on the Scapy [2] library for crafting packets. Epydoc is also required for building the API documentation. To install the required libraries use:

$ pip install -r requirements.txt

Once you have downloaded pysap's sources, you can install it easily using the Python's setuptools script provided:

1. $ python setup.py test

2. $ python setup.py install

• Some scapy installations also requires the following steps:

  Edit the file supersocket.py (located for example on /usr/local/lib/python2.7/dist-packages/scapy/supersocket.py)

  Add the line from scapy.packet import Padding

• Additionally, runnnig Scapy on Windows might require some patching:

  Edit the file supersocket.py

  Add the line import arch at the end of the file

  See this scapy issue for more details.

Documentation of the API can be build using:

$ python setup.py doc

A build is also available at http://pythonhosted.org/pysap/.

Examples can be found in the examples directory.

This library is distributed under the GPLv2 license. Check the COPYING file for more details.

[1] http://www.sap.com/platform/netweaver/index.epx

[2] http://www.secdev.org/projects/scapy/

[3] http://corelabs.coresecurity.com/index.php?module=Wiki&action=view&type=tool&name=pysap

[4] http://www.coresecurity.com/content/sap-netweaver-dispatcher-multiple-vulnerabilities

[5] http://www.coresecurity.com/content/SAP-netweaver-msg-srv-multiple-vulnerabilities

[6] http://corelabs.coresecurity.com/index.php?module=Wiki&action=view&type=publication&name=Uncovering_SAP_vulnerabilities

[7] http://corelabs.coresecurity.com/index.php?module=Wiki&action=view&type=publication&name=saps_network_protocols_revisited

Whether you want to report a bug or give some suggestions on this package, drop us a few lines at [email protected] or contact the author email [email protected].