![]() ![]() The KDC authenticates the user by contacting the Active Directory and the Authentication Server (AS) issues a Ticket Granting Ticket (TGT) that the client can use to request a service ticket for the SAP system later. Upon logon the user is validated against a domain controller (DC) server that also functions as an active directory LDAP server, a Key Distribution Center (KDC), an Authentication Server (AS) and a Ticket Granting Service (TGS).The local security subsystem takes the domain name specified by the user during logon, and uses DNS to locate a domain controller in the domain Please be aware that SAP Single Sign-On and gsskrb5.dll/g圆4krb5.dll are NOT interoperable, because they use different wire protocols and different token formats Only SAP side of the coding is supported. SAP Note150380 – Is Kerberos 5 supported for use with SNC? SAP does not provide support for problems that occur within/inside third-party Single Sign-On solutions at SAP’s BC-SNC interface.Access to note 2115486 can be requested via customer message on component BC-SEC-SNC. The files are still available under note 2115486. Further development for this solution is discontinued and SAP offers support only for the SAP wrapper, but not for the underlying authentication mechanisms, which are genuine Microsoft technology and beyond SAP’s control (see note 150380). */ Previous versions of the note 352295 contained the download of the GSSKRB5.dlls. More information about this product can be found at. *With the product SAP Single Sign-On SAP offers its own comprehensive single sign-on solution based on this interface, covering multiple scenarios, including the re-use of Microsoft Windows authentication. This interface is based on the GSS-API v2 standard, which was developed in the IETF (Internet Engineering Task Force) and published as RFCs 2743+2744. SAP ABAP systems offers the BC-SNC software interface to perform authentication through an external single sign-on solution. We re-use the Microsoft Windows Kerberos or NTLM authentication for single sign-on to SAP R/3 systems.SAP’s Disclaimer on GSSKrb5.DLL *Important : You do not need to install any additional client software. The Single Sign-on for SAP installs and configures the gsskrb5.dll module which provides a SAP Secure Network Communications (SNC) compliant Generic Security Services Application Program Interface (GSS-API) to Microsoft Security Support Provider Interface (SSPI) translation layer. The Single Sign-on for SAP solution is used with SAP GUI clients running on Windows systems that are joined to an Active Directory domain. In pure Microsoft environments, Kerberos authentication is only available for Domain Accounts that are managed by a Microsoft Active Directory, but NOT for local computer accounts. The Microsoft Kerberos SSP should be on-the-wire compatible with the standardized Kerberos 5 GSS-API mechanism (rfc1964 and rfc4121), and interoperable with Kerberos 5 implementations from various vendors/providers for other platforms. gssntlm.dll/g圆4ntlm.dll wraps the Microsoft NTLM SSP (1), and gsskrb5.dll/g圆4krb5.dll wraps the Microsoft Kerberos SSP The DLLs attached to this Note only “wraps” a genuine Microsoft SSP, and translate API calls and API semantics between the IETF GSS-API used by SAP’s BC-SNC interface, and the underlying Microsoft’s SSP. (2) Microsoft Kerberos SSP with mutual authentication, encryption and integrity protection for the entire communication (1) NT Lan Manager Sercurity Service Provider (NTLM SSP) with client-only authentication based on a challenge-response protocol an no protection for application data. Microsoft has implemented authentication and single sign-on on their Win32 platforms in a proprietary variant of GSS-API named Microsoft “SSPI” (Security Service Provider Interface), and includes two Security Service Providers for user authentication in Microsoft Windows: In this blog we are going to use Microsoft proprietary single sign on mechanism for SAPGUI. This method allows you to reduce your TCO. Is there a way to single sign on without any 3rd party or SSO products for SAP session from SAPGUI ? Yes, if you have Microsoft Active directory with kerberos support then it is possible. But there has been some limitations and cost involved in using a Single Sign-On products. In order to reduce manual login process Single sign on (SSO) has been introduced. It also takes soo much of time and cost in resetting the passwords from an IT team. In today’s world its hard to remember user name and password for every environment we login. ![]()
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