Solutions over the Internet
Technical Specification
1 Introduction
SAP has embarked on a project to enable its customers to establish secure connections to SAP over the Internet for support purposes. Currently, SAP offers two alternative ways to connect to the Support Network over the Internet:
SAProuter with Secure Network Communications (SNC) over the Internet Internet Virtual Private Network (VPN)
This document describes both alternatives and their technical specifications, and compares the two options. If you read this document, you will have enough information to decide which option is better for your needs and requirements. Both options provide the level of security recommended when using a public medium like the Internet. In other words, strong encryption will be employed for data that travels over the Internet.
2 Overview of Technical Setup
SAP has implemented a functional subset of the Remote Customer Support Network services in an Internet DMZ (demilitarized zone) in SAP AG, Walldorf. With this infrastructure in place, the suite of Remote Customer Support Network service offerings is accessible over the Internet.
SAProuter/SNC via Internet Internet VPN
SNC secured SAProuter – SAProuter
connections are established between SAP and the customer’s SAProuter to provide data confidentiality and integrity services. These SNC connections complement the leased lines in the current SAPNet R/3 Frontend environment. State-of-the-art encryption, authentication, and access control technology will be employed. No additional hardware compared to a leased-line setup is required at either end of the connection. (See diagram below).
Customers are required to install a SAProuter with an official, static IP address (DHCP Addresses will not work) running SNC inbound and outbound connection to SAP at their end of the connection in a Demilitarized Zone. This SAProuter must be accessible from the Internet. All service connections between SAP and the customer must be made over the respective SAProuters.
Certificates needed are available on the SAP Service Marketplace.
LAN-to-LAN IPSec VPNs are established between SAP and the customer’s network to provide data confidentiality and integrity services. These VPNs complement the leased lines in the current Remote Customer Support Network environment. State-of-the-art encryption, authentication, and access control technology will be employed. VPN equipment is required at both ends of the connection. The VPN switch at customer’s side must be reachable from the Internet. (See diagram below).
Besides the VPN equipment (also called VPN switch or VPN gateway), customers are also required to install a SAProuter with an official IP address at their end of the connection. All service connections between SAP and the customer must be made over the respective SAProuters.
For the pilot project, access control and authentication at the VPN gateways will be regulated using static keys. SAP will generate these keys and provide them to the customer. In future, certificate-based authentication is likely to be utilized.
3 Diagrams and Infrastructure
Internet
SAP Corporate Network
Firewall Customer's Internal Network Firewall Internet Router SAProuter @ SAP (with SNC) SAProuter @ Customer (with SNC) Public Interfaces (official IP addresses) SNC Tunnel (encrypted) Internet Router R/3 System
Figure 1 - SAProuter with SNC over Internet
Internet
SAP Corporate Network
Firewall Customer's Internal Network Firewall Internet Router SAProuter @ SAP SAProuter @ Customer Public Interfaces (official IP addresses)
IPSec Tunnel (encrypted)
Technical Requirements
SAProuter / SNC via Internet Internet VPN
1. Internet connection: recommended minimum bandwidth = 64 kbps 2. SAProuter machine
3. Official IP address (static) for the SAProuter host.
4. SAProuter installation package 5. SAP SNC libraries and executables.
These may be downloaded from the SAP Service Marketplace.
6. A Demilitarized Zone at the customer site with a minimal setup as described in the networking section of the SAP Security Guide, Parts 1-3 available in the Service Marketplace at:
http://service.sap.com/SYSTEMMANAGEME NT Choose: Security > Security in Detail > SAP Security Guides.
More information on SNC connections is also available in the SAP Service Marketplace. 7. Since the host running the SAProuter
software is a full computer with operating system, the security at the operating system level must be hardened in order to minimize the risk of the machine being hacked from the Internet. One recommendation will be for example to run a C2 security level compliant operating system. SAP takes no liability if the security of the company’s network is
compromised.
8. Other networking equipment (routers and hubs) needed to form the network at the customer’s premises (see Figure 1).
1. Internet connection: recommended minimum bandwidth = 64 kbps 2. SAProuter machine
3. Two (2) official IP subnets. These IP subnets are assigned to:
The public interface of the VPN box. Additionally, this IP subnet must be routed in the Internet.
The customer’s SAProuter
4. If the customer is operating any firewall(s) to secure its Internet connection, the firewall(s) must permit the edge VPN equipment to exchange IPsec packets using their respective public interfaces (the VPN gateway may also serve as the firewall). Specifically, the customer’s firewall must allow UDP port 500 (IKE) and IP Protocol 50 (ESP)
5. Recommended VPN equipment: SAP is using CISCO VPN equipment. Customers may also try to connect using other IPSec compliant VPN equipment. The equipment must support certain IPSec features (see Appendix A) that are mandatory to establish communication with SAP’s VPN equipment. SAP cannot guarantee interoperability between SAP's CISCO VPN equipment and other types of VPN equipment that the customer elects to use instead. If you wish to use other VPN equipment, contact SAP.
3.1 Comparison of the Two Options
Property SAProuter / SNC via Internet Internet VPN
Hardware requirements
Firewall + SAProuter host in DMZ VPN switch + firewall + SAProuter host
(VPN and firewall may be the same box)
Software SAProuter starting from NI version 35
SAPSECULIB can be obtained from the Service Marketplace
SAProuter starting from NI version 35
Network addresses (besides address of Internet router, firewall, …)
1 official static IP address for SAProuter 1 official static IP address for VPN switch + 1 official static IP address for SAProuter host
Configuration issues
Careful setup of saprouttab necessary for security. Saprouttab influences security strongly as access is controlled via saprouttab and firewall.
Careful setup of routing configuration in VPN switch necessary for security.
Saprouttab influences security less strongly as access is controlled via VPN switch, SAProuter software and firewall
Encryption By software By hardware
Encrypted data TCP packets
Only the data stream between SAProuters is encrypted
Encryption is handled on Application layer (OSI network layer 7)
IPsec (IP packets)
Encryption is handled on IP layer (OSI network layer 3)
Minimum required
free bandwidth
64 kbit/s but may work also with 32 kbit/s
64 kbit/s Supported
services on SAP side
All except FTP (files download)
Please note: NO access available to SAP
internal systems!
All including FTP (files download)
Key management Digital certificates being requested via
Service Marketplace Public Key Infrastructure (PKI)
Pre-shared keys provided by SAP, later Public Key Infrastructure (PKI)
Key storage In file system In VPN switch
Operating system SAProuter resides on a computer
therefore it is necessary to harden the security at the operating system level (for example, C2 level OS) to minimize the risk of the machine being hacked from the Internet
VPN switch has a very small and limited operating system, thus no additional security hardening is required. The SAProuter machine is not reachable from the Internet, thus the risk of hacking is much less. However, security hardening
measures at the SAProuter operating system level are also recommended Additional
expertise
SAProuter knowledge usually available, SNC configuration requires additional knowledge
VPN hardware requires special knowledge, higher technical expertise
Standards Based on SNC, SAP proprietary standard Based on IPSec, well established industry
standard Contributing to
costs
- Firewall hardware and software - Firewall administration costs - No additional license fee for security
library based on SECUDE
3.2 Terms and Conditions
1. The customer is responsible for obtaining any and all approval(s) for importing and operating their equipment, as may be required by the respective local laws and regulations. The use of cryptographic software and hardware is regulated in some countries.
2. All costs for setting up the necessary infrastructure at the customer’s premises is to be borne by the customer.
Appendix A
Mandatory IPSec Features (for the Internet VPN option)
Encapsulating Security Protocol (ESP)
Internet Key Exchange (IKE), with support of Diffie-Hellman Group 2 (1024 bits keys) Encryption Algorithm: Triples DES (3DES)
Authentication Algorithm: HMAC-MD5 and HMAC-SHA1
Support for authentication using shared secrets, RSA digital signatures, and X.509 certificates Support for Diffie-Hellman Group 2 (keys of 1024 bits)
Perfect Forward Secrecy
Appendix B
Remote Customer Support Network over the Internet
Connection Data Sheet
Please complete and fax this data sheet to the SAP Network Hotline at +49 (180) 5 34 34 30
1. Customer Information
Company: Customer No.:
Contact person networking:
Tel.: E-mail address: Fax:
2. Desired Internet Connectivity Option
[ ] SAProuter / SNC via Internet [ ] Internet VPN
3. Networking Information
IP address of SAProuter computer Host name of SAProuter computer IP address of VPN switch (if applicable)
Type of VPN switch: brand and model (if applicable)
4. Information About Your Internet Connection
Type of Internet connection (mark one) [ ] Frame Relay
[ ] ISDN [ ] Leased line [ ] X.25 [ ] Dial-up [ ] xDSL [ ] Other: Bandwidth of your Internet connection (in kbps)
5. Additional Observations
You need official Internet IP addresses for the computer on which the communication software SAProuter and the proxy for the remote access is installed (this also apply to the VPN switch). Private address spaces such as
10.0.0.0 - 10.255.255.255 172.16.0.0 - 172.31.255.255 192.168.0.0 - 192.168.255.255 cannot be used.
If you do not have your own official IP addresses, obtain one from your Internet Service Provider (ISP). If you have any of the following questions:
How do I fill in the data sheet? How can I obtain an IP address?
What type of software and hardware do I need to establish remote access? Questions on the use of a firewall
What kind of costs can I anticipate?
contact the consulting partner responsible for your area, or contact the SAP Network Hotline: Fax: +49 180 53 434 30
