If USER-HOST is not specifed, the value * is accepted. To assign the new settings to the registered programs too (if they have been changed at all), the servers must first be deregistered and then registered again. RFCs between two SAP NetWeaver AS ABAP systems are typically controlled on network level only. Registered Server Programs at a standalone RFC Gateway may be used to integrate 3rd party technologies. You can make dynamic changes by changing, adding, or deleting entries in the reginfo file. You have a non-SAP tax system that needs to be integrated with SAP. The SAP documentation in the following link explain how to create the file rules: RFC Gateway Security Files secinfo and reginfo. File reginfocontrols the registration of external programs in the gateway. It is common and recommended by many resources to define the following rule in a custom prxyinfo ACL: With this, all requests from the local system, as well as all application servers of the same system, will be proxied by the RFC Gateway to any destination or end point. Its location is defined by parameter 'gw/reg_info'. Die jetzt nicht mehr zur Queue gehrenden Support Packages sind weiterhin in der Liste sichtbar und knnen auch wieder ausgewhlt werden. In an ideal world each program alias of the relevant Registered Server Programs would be listed in a separate rule, even for registering program aliases from one of the hosts of internal. Part 8: OS command execution using sapxpg. For this reason, as an alternative you can work with syntax version 2, which complies with the route permission table of the SAProuter. Dieses Verfahren ist zwar sehr restriktiv, was fr die Sicherheit spricht, hat jedoch den sehr groen Nachteil, dass in der Erstellungsphase immer Verbindungen blockiert werden, die eigentlich erwnscht sind. With this blogpost series i try to give a comprehensive explanation of the RFC Gateway Security: Part 1: General questions about the RFC Gateway and RFC Gateway security. To use all capabilities it is necessary to set the profile parameter gw/reg_no_conn_info = 255. Once you have completed the change, you can reload the files without having to restart the gateway. In this case, the secinfo from all instances is relevant as the system will use the local RFC Gateway of the instance the user is logged on to start the tax program. E.g "RegInfo" file entry, P TP=BIPREC* USER=* HOST=* NO=1 CANCEL=* ACCESS=* Part 3: secinfo ACL in detail In case the files are maintained, the value of this parameter is irrelevant; gw/sim_mode: activates/deactivates the simulation mode (see the previous section of this WIKI page). This order is not mandatory. Alerting is not available for unauthorized users, Right click and copy the link to share this comment, Part 1: General questions about the RFC Gateway and RFC Gateway security, Part 8: OS command execution using sapxpg, Secure Server Communication in SAP Netweaver AS ABAP. If we do not have any scenarios which relay on this use-case we are should disable this functionality to prevent from misuse by setting profile parameter gw/rem_start = DISABLED otherwise we should consider to enforce the usage of SSH by setting gw/rem_start = SSH_SHELL. After an attack vector was published in the talk SAP Gateway to Heaven from Mathieu Geli and Dmitry Chastuhin at OPDCA 2019 Dubai (https://github.com/gelim/sap_ms) the RFC Gateway security is even more important than ever. Maybe some security concerns regarding the one or the other scenario raised already in you head. In diesem Blog-Beitrag werden zwei von SAP empfohlene Vorgehensweisen zur Erstellung der secinfo und reginfo Dateien aufgefhrt mit denen die Security Ihres SAP Gateways verstrkt wird und wie der Generator dabei hilft. In case you dont want to use the keyword, each instance would need a specific rule. File reginfocontrols the registration of external programs in the gateway. In the slides of the talk SAP Gateway to Heaven for example a scenario is outlined in which a SAProuter installed on the same server as the RFC Gateway could be utilized to proxy a connection to local. In diesem Blog-Beitrag werden zwei von SAP empfohlene Vorgehensweisen zur Erstellung der secinfo und reginfo Dateien aufgefhrt mit denen die Security Ihres SAP Gateways verstrkt wird und wie der Generator dabei hilft. Part 6: RFC Gateway Logging Bei groen Systemlandschaften ist dieses Verfahren sehr aufwndig. Save ACL files and restart the system to activate the parameters. Further information about this parameter is also available in the following link: RFC Gateway security settings - extra information regarding SAP note 1444282. This allows default values to be determined for the security control files of the SAP Gateway (Reginfo; Secinfo; Proxyinfo) based on statistical data in the Gateway log. Falls Sie danach noch immer keine Anwendungen / Registerkarten sehen, liegt es daran, dass der Gruppe / dem Benutzer das allgemeine Anzeigenrecht auf der obersten Ebene der jeweiligen Registerkarte fehlt. Here are some examples: At the application server #1, with hostname appsrv1: At the application server #2, with hostname appsrv2: The SAP KBA2145145has a video illustrating how the secinfo rules work. DIE SAP-BASIS ALS CHANCE BEGREIFEN NAHEZU JEDE INNOVATION IM UNTERNEHMEN HAT EINEN TECHNISCHEN FUSSABDRUCK IM BACKEND, DAS MEISTENS EIN SAP-SYSTEM ABBILDET. Um diese Website nutzen zu knnen, aktivieren Sie bitte JavaScript. To overcome this issue the RFC enabled program SAPXPG can be used as a wrapper to call any OS command. Wir untersttzen Sie gerne bei Ihrer Entscheidungen. Should a cyberattack occur, this will give the perpetrators direct access to your sensitive SAP systems. The following syntax is valid for the secinfo file. open transaction SMGW -> Goto -> expert functions -> Display secinfo/reginfo Green means OK, yellow warning, red incorrect. Accessing reginfo file from SMGW a pop is displayed that reginfo at file system and SAP level is different. For a RFC Gateway of AS Java or a stand-alone RFC Gateway this can be determined with the command-line tool gwmon by running the command gwmon nr= pf= then going to the menu by typing m and displaying the client table by typing 3. This is for example used by AS ABAP when starting external commands using transaction SM49/SM69. Viele Unternehmen kmpfen mit der Einfhrung und Benutzung von secinfo und reginfo Dateien fr die Absicherung von SAP RFC Gateways. Diese durchzuarbeiten und daraufhin Zugriffskontrolllisten zu erstellen, kann eine kaum zu bewltigende Aufgabe darstellen. Program cpict4 is allowed to be registered if it arrives from the host with address 10.18.210.140. Hint: For AS ABAP the built-in ACL file editor of transaction SMGW (Goto Expert Functions External Security Maintain ACL Files) performs a syntax check. In diesem Blog-Beitrag werden zwei von SAP empfohlene Vorgehensweisen zur Erstellung der secinfo und reginfo Dateien aufgefhrt mit denen die Security Ihres SAP Gateways verstrkt wird und wie der Generator dabei hilft. Beachten Sie, da der SAP Patch Manager die Konfiguration Ihres SAP-Systems bercksichtigt und nur solche Support Packages in die Queue aufnimmt, die in Ihr System eingespielt werden drfen. 1. other servers had communication problem with that DI. There may also be an ACL in place which controls access on application level. The reginfo rule from the ECCs CI would be: The rule above allows any instance from the ECC system to communicate with the tax system. Part 1: General questions about the RFC Gateway and RFC Gateway security. Fr die gewnschten Registerkarten "Gewhren" auswhlen. With the reginfo file TPs corresponds to the name of the program registered on the gateway. Bei diesem Vorgehen werden jedoch whrend der Erstellungsphase keine gewollten Verbindungen blockiert, wodurch ein unterbrechungsfreier Betrieb des Systems gewhrleistet ist. However, you still receive the "Access to registered program denied" / "return code 748" error. All of our custom rules should bee allow-rules. When using SNC to secure RFC destinations on AS ABAP the so called SNC System ACL, also known as System Authentication, is introduced and must be maintained accordingly. If the Gateway protections fall short, hacking it becomes childs play. This publication got considerable public attention as 10KBLAZE. Most common use-case is the SAP-to-SAP communication, in other words communication via RFC connections between SAP NetWeaver AS systems, but also communication from RFC clients using the SAP Java Connector (JCo) or the SAP .NET Connector (NCo) to SAP NetWeaver systems. After an attack vector was published in the talk SAP Gateway to Heaven from Mathieu Geli and Dmitry Chastuhin at OPDCA 2019 Dubai (https://github.com/gelim/sap_ms) the RFC Gateway security is even more important than ever. For all Gateways, a sec_info-ACL, a prxy_info-ACL and a reg_info-ACL file must be available. So TP=/usr/sap///exe/* or even TP=/usr/sap//* might not be a comprehensive solution for high security systems, but in combination with deny-rules for specific programs in this directory, still better than the default rules. The secinfosecurity file is used to prevent unauthorized launching of external programs. Please pay special attention to this phase! Part 7: Secure communication Hinweis: Whlen Sie ber den Button und nicht das Dropdown-Men Gewhren aus! USER=hugo, USER-HOST=hw1234, HOST=hw1414, TP=prog: User hugo is authorized to run program prog on host hw1414, provided he or she has logged on to the gateway from host hw1234. They also have a video (the same video on both KBAs) illustrating how the reginfo rules work. Die erstellten Log-Dateien knnen im Anschluss begutachtet und daraufhin die Zugriffskontrolllisten erstellt werden. This means that the sequence of the rules is very important, especially when using general definitions. Its location is defined by parameter gw/reg_info. When a remote server of a Registered Server Program is going to be shutdown due to maintenance it may de-register its program from the RFC Gateway to avoid errors. This means that if the file is changed and the new entries immediately activated, the servers already logged on will still have the old attributes. Even if the system is installed with an ASCS instance (ABAP Central Services comprising the message server and the standalone enqueue server), a Gateway can still be configured on the ASCS instance. There are two different versions of the syntax for both files: Syntax version 1 does not enable programs to be explicitly forbidden from being started or registered. Every line corresponds one rule. Please note: SNC User ACL is not a feature of the RFC Gateway itself. In addition, the RFC Gateway logging (see the SAP note910919) can be used to log that an external program was registered, but no Permit rule existed. Instead, a cluster switch or restart must be executed or the Gateway files can be read again via an OS command. This ACL is applied on the ABAP layer and is maintained in transaction SNC0. The RFC Gateway does not perform any additional security checks. *. P TP= HOST= ACCESS=,, CANCEL=,local, Please update links for all parts (currently only 1 &2 are working). SMGW-->Goto -->External Functions --> External Security --> Maintenance of ACL files --> pop-up is shown as below: "Gateway content and file content for reginfo do not match starting with index " (xx is the index value shown in the pop-up), Gateway, Security, length, line, rule, limit, abap , KBA , BC-CST-GW , Gateway/CPIC , Problem. To set up the recommended secure SAP Gateway configuration, proceed as follows:. 1. other servers had communication problem with that DI. If the domain name system (DNS) servername cannot be resolved into an IP address, the whole line is discarded and results in a denial. where ist the hint or wiki to configure a well runing gw-security ? The wildcard * should not be used at all. Additional ACLs are discussed at this WIKI page. In case of TP Name this may not be applicable in some scenarios. If you want to use this syntax, the whole file must be structured accordingly and the first line must contain the entry #VERSION=2 (written precisely in this format). Visit SAP Support Portal's SAP Notes and KBA Search. IP Addresses (HOST=, ACCESS= and/or CANCEL=): You can use IP addresses instead of host names. Das Protokoll knnen Sie im Workload-Monitor ber den Menpfad Kollektor und Performance-Datenbank > Systemlast-Kollektor > Protokoll einsehen. The network service that, in turn, manages the RFC communication is provided by the RFC Gateway. Here, activating Gateway logging and evaluating the log file over an appropriate period (e.g. ber das Dropdown-Men regeln Sie, ob und wie weit Benutzer der Gruppe, die Sie aktuell bearbeiten, selbst CMC-Registerkartenkonfigurationen an anderen Gruppen / Benutzern vornehmen knnen! Giving more details is not possible, unfortunately, due to security reasons. The name of the registered program will be TAXSYS. gw/acl_mode: this parameter controls the value of the default internal rules that the RFC Gateway will use, in case the reginfo/secinfo file is not maintained. P TP=* USER=* USER-HOST=internal HOST=internal. It is common to define this rule also in a custom reginfo file as the last rule. The local gateway where the program is registered can always cancel the program. This opensb the Gateway ACL Editor, where you can display the relevant files.. To enable system-internal communication, the files must contain the . Danach wird die Queue neu berechnet. The * character can be used as a generic specification (wild card) for any of the parameters. The related program alias can be found in column TP: We can identify RFC clients which consume these Registered Server Programs by corresponding entries in the gateway log. Whrend der Freischaltung aller Verbindungen wird mit dem Gateway-Logging eine Aufzeichnung aller externen Programmaufrufe und Systemregistrierungen vorgenommen. As we learned in part 2 SAP introduced the following internal rule in the in the reginfo ACL: P TP=* HOST=internal,local ACCESS=internal,local CANCEL=internal,local. Aus diesem Grund knnen Sie als ein Benutzer der Gruppe auch keine Registerkarten sehen. Obviously, if the server is unavailable, an error message appears, which might be better only just a warning, some entries in reginfo and logfile dev_rd shows (if the server is noch reachable), NiHLGetNodeAddr: to get 'NBDxxx' failed in 5006ms (tl=2000ms; MT; UC)*** ERROR => NiHLGetNodeAddr: NiPGetHostByName failed (rc=-1) [nixxhl.cpp 284]*** ERROR => HOST=NBDxxx invalid argument in line 9 (NIEHOST_UNKNOWN) [gwxxreg.c 2897]. RFCs between RFC clients using JCo/NCo or Registered Server Programs and the AS ABAP are typically controlled on network level only. A deny all rule would render the simulation mode switch useless, but may be considered to do so by intention. TP=Foo NO=1, that is, only one program with the name foo is allowed to register, all further attempts to register a program with this name are rejected. While it was recommended by some resources to define a deny all rule at the end of reginfo, secinfo ACL this is not necessary. Another example: you have a non-SAP tax system that will register a program at the CI of an SAP ECC system. No error is returned, but the number of cancelled programs is zero. In SAP NetWeaver Application Server Java: The SCS instance has a built-in RFC Gateway. You have configured the SLD at the Java-stack of the SolMan system, using the RFC Gateway of the SolMans ABAP-stack. All programs started by hosts within the SAP system can be started on all hosts in the system. Host Name (HOST=, ACCESS= and/or CANCEL=): The wildcard character * stands for any host name, *.sap.com for a domain, sapprod for host sapprod. The related program alias also known as TP Name is used to register a program at the RFC Gateway. The secinfo file has rules related to the start of programs by the local SAP instance. Somit knnen keine externe Programme genutzt werden. There are two different syntax versions that you can use (not together). Trademark. Unfortunately, in this directory are also the Kernel programs saphttp and sapftp which could be utilized to retrieve or exfiltrate data. For AS ABAP the ACLs should be maintained using the built-in ACL file editor of transaction SMGW (Goto Expert Functions External Security Maintain ACL Files). For example: The SAP KBAs1850230and2075799might be helpful. Since this keyword is relaying on a kernel feature as well as an ABAP report it is not available in the internal RFC Gateway of SAP NW AS Java. three months) is necessary to ensure the most precise data possible for the connections used. 3. From my experience the RFC Gateway security is for many SAP Administrators still a not well understood topic. Da das aber gewnscht ist, mssen die Zugriffskontrolllisten schrittweise um jedes bentigte Programm erweitert werden. 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