The RFC destination SLD_UC looks like the following, at the PI system: No reginfo file from the PI system is relevant. Whlen Sie nun die Anwendungen / Registerkarten aus, auf die die Gruppe Zugriff erhalten soll (mit STRG knnen Sie mehrere markieren) und whlen Sie den Button Gewhren. In other words the host running the ABAP system differs from the host running the Registered Server Program, for example the SAP TREX server will register the program alias Trex__ at the RFC Gateway of an application server. The local gateway where the program is registered can always cancel the program. 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. IP Addresses (HOST=, ACCESS= and/or CANCEL=): You can use IP addresses instead of host names. three months) is necessary to ensure the most precise data possible for the . All subsequent rules are not checked at all. This list is gathered from the Message Server every 5 minutes by the report RSMONGWY_SEND_NILIST. If the Simulation Mode is active (parameter gw/sim_mode = 1), the last implicit rule will be changed to Allow all. Limiting access to this port would be one mitigation. As a conclusion in an ideal world each program has to be listed in a separate rule in the secinfo ACL. An example could be the integration of a TAX software. After implementing this note, modify the Gateway security files "reg_info" and "sec_info" with TP=BIPREC* (Refer notes 614971 and 1069911). 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. Save ACL files and restart the system to activate the parameters. Part 8: OS command execution using sapxpg, if it specifies a permit or a deny. The RFC Gateway can be seen as a communication middleware. Please note: SNC User ACL is not a feature of the RFC Gateway itself. Part 4: prxyinfo ACL in detail. Hint: Besides the syntax check, it also provides a feature supporting rule creation by predicting rules out of an automated gateway log analysis. As a result many SAP systems lack for example of proper defined ACLs to prevent malicious use. While typically remote servers start the to-be-registered program on the OS level by themselves, there may be cases where starting a program is used to register a Registered Server Program at the RFC Gateway. Part 6: RFC Gateway Logging. 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. 1. other servers had communication problem with that DI. 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]. 2) It is possible to change the rules in the files and reload its configuration without restart the RFC Gateway: open the transaction SMGW -> Goto -> expert functions -> external security -> reload However, in such situation, it is mandatory to de-register the registered program involved and reregister it again because programs already registered Part 5: ACLs and the RFC Gateway security. All programs started by hosts within the SAP system can be started on all hosts in the system. The RFC Gateway act as an RFC Server which enables RFC function modules to be used by RFC clients. The related program alias can be found in column TP Name: We can verify if the functionality of these Registered RFC Server programs is accessible from the AS ABAP by looking for a TCP/IP connection in transaction SM59 with Technical Settings Activation Type = Registered Server Program the corresponding Program ID and either no Gateway Options or connection details to any of the RFC Gateways belonging to the same system set: Please note: If the AS ABAP system has more than one application servers and therefore also more than one RFC Gateways there may be scenarios in which the Registered Server Program is registered at one specific RFC Gateway only. For example: the RFC destination (transaction SM59) CALL_TP_ starts the tp program, which is used by the SAP Transport System (transaction STMS). The reginfo file has the following syntax. We can identify these use cases by going to transaction SMGW -> Goto -> Logged on Clients and looking for lines with System Type = Registered Server and Gateway Host = 127.0.0.1 (in some cases this may be any other IP address or hostname of any application server of the same system). You have already reloaded the reginfo file. How can I quickly migrate SAP custom code to S/4HANA? Notice that the keyword "internal" is available at a Standalone RFC Gateway (like the RFC Gateway process that runs at an SCS or ASCS instance) only after a certain SAP kernel version. 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. 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. So lets shine a light on security. The reginfo file have ACLs (rules) related to the registration of external programs (systems) to the local SAP instance. The following steps usually need to be done manually to secure an SAP Gateway: Our SAST Interface Management module in the SAST SUITE provides support in hardening the SAP Gateway. There are various tools with different functions provided to administrators for working with security files. This ACL is applied on the ABAP layer and is maintained in transaction SNC0. Check out our SAST SOLUTIONS website or send us an e-mail us at sast@akquinet.de. On SAP NetWeaver AS ABAP registering Registered Server Programs byremote servers may be used to integrate 3rd party technologies. 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. Sobald dieses Recht vergeben wurde, taucht die Registerkarte auch auf der CMC-Startseite wieder auf. 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. The reginfo file is holding rules controlling which remote servers (based on their hostname/ip-address) are allowed to either register, access or cancel which 'Registered Server Programs' (based on their program alias (also known as 'TP name')). Part 3: secinfo ACL in detail. Default values can be determined from the aggregated Gateway logging and used to assemble control data, and subsequently leverage the control data content for further use. . Only clients from the local application server are allowed to communicate with this registered program. If the TP name has been specified without wild cards, you can specify the number of registrations allowed here. If someone can register a "rogue" server in the Message Server, such rogue server will be included in the keyword "internal" and this could open a security hole. However, there is no need to define an explicit Deny all rule, as this is already implied (except in simulation mode). Wechseln Sie dazu auf die gewnschte Registerkarte (im Beispiel ist das Universen), whlen Sie Verwalten --> Sicherheit auf oberster Ebene --> Alle Universen (je nach Registerkarte unterscheidet sich der letzte Punkt). (any helpful wiki is very welcome, many thanks toIsaias Freitas). RFC had issue in getting registered on DI. It is configured to start the tax calculation program at the CI of the SAP system, as the tax system is installed only there. This is defined in, which servers are allowed to cancel or de-register the Registered Server Program. Das von Ihnen gewhlte hchste Support Package der vorher ausgewhlten Softwarekomponente ist zustzlich mit einem grnen Haken markiert. About item #1, I will forward your suggestion to Development Support. In other words, the SAP instance would run an operating system level command. The secinfo file from the CI would look like the below: In case you dont want to use the keywords local and internal, youll have to manually specify the hostnames. Part 8: OS command execution using sapxpg. If the Gateway Options are not specified the AS will try to connect to the RFC Gateway running on the same host. To mitigate this we should look if it is generated using a fixed prefix and use this as a pattern with an ending wildcard in order to reduce the effective values, e.g., TP=Trex__*, which would still be better than TP=*`. Spielen Sie nun die in der Queue stehenden Support Packages ein [Seite 20]. All of our custom rules should bee allow-rules. The secinfosecurity file is used to prevent unauthorized launching of external programs. For example: an SAP SLD system registering the SLD_UC and SLD_NUC programs at an ABAP system.The secinfo file has rules related to the start of programs by the local SAP instance. Firstly review what is the security level enabled in the instance as per the configuration of parameter gw/reg_no_conn_info. Besttigen Sie den auftauchenden Hinweis und vergeben Sie fr die gewnschten Gruppen zumindest das folgende Recht: Allgemein --> Allgemein --> Objekte Anzeigen. The local gateway where the program is registered always has access. Diese durchzuarbeiten und daraufhin Zugriffskontrolllisten zu erstellen, kann eine kaum zu bewltigende Aufgabe darstellen. Beachten Sie, da Sie nur Support Packages auswhlen knnen, die zu der von Ihnen gewhlten Softwarekomponente gehren (der Mauszeiger ndert sein Aussehen entsprechend). Maybe some security concerns regarding the one or the other scenario raised already in you head. From a technical perspective the RFC Gateway is a SAP kernel process (gwrd, gwrd.exe) running on OS level as user adm. Part 1: General questions about the RFC Gateway and RFC Gateway security. RFCs between two SAP NetWeaver AS ABAP systems are typically controlled on network level only. Part 7: Secure communication if the server is available again, this as error declared message is obsolete. Thus, if an explicit Deny rule exists and it matches the request being analyzed by the RFC Gateway, the RFC Gateway will deny the request. The very first line of the reginfo/secinfo file must be "#VERSION=2"; Each line must be a complete rule (you cannot break the rule into two or more lines); The RFC Gateway will apply the rules in the same order as they appear in the file, and only the first matching rule will be used (similar to the behavior of a network firewall). Terms of use |
Part 8: OS command execution using sapxpg. Its location is defined by parameter 'gw/reg_info'. 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 What is important here is that the check is made on the basis of hosts and not at user level. 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. Additional ACLs are discussed at this WIKI page. When editing these ACLs we always have to think from the perspective of each RFC Gateway to which the ACLs are applied to. To set up the recommended secure SAP Gateway configuration, proceed as follows:. Support Packages fr eine ausgewhlte Komponente werden entsprechend ihrer Reihenfolge in die Queue gestellt. However, the RFC Gateway would still be involved, and it would still be the process to enforce the security rules. At time of writing this can not be influenced by any profile parameter. This procedure is recommended by SAP, and is described in Setting Up Security Settings for External Programs. (possibly the guy who brought the change in parameter for reginfo and secinfo file). 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. Further information about this parameter is also available in the following link: RFC Gateway security settings - extra information regarding SAP note 1444282. Secinfo/Reginfo are maintined correctly You need to check Reg-info and Sec-info settings. Its location is defined by parameter gw/prxy_info. Its functions are then used by the ABAP system on the same host. Despite this, system interfaces are often left out when securing IT systems. The RFC Gateway is capable to start programs on the OS level. The default configuration of an ASCS has no Gateway. 3. Someone played in between on reginfo file. Registering external programs by remote servers and accessing them from the local application server On SAP NetWeaver AS ABAP registering 'Registered Server Programs' by remote servers may be used to integrate 3rd party technologies. The first letter of the rule can begin with either P (permit) or D (deny). Environment. The RFC destination would look like: The secinfo files from the application instances are not relevant. 2. With this rule applied you should properly secure access to the OS (e.g., verify if all existing OS users are indeed necessary, SSH with public key instead of user+pw). Danach wird die Queue neu berechnet. You dont need to define a deny all rule at the end, as this is already implicit (if there is no matching Permit rule, and the RFC Gateway already checked all the rules, the result will be Deny except when the Simulation Mode is active, see below). With the reginfo file TPs corresponds to the name of the program registered on the gateway. In this case the Gateway Options must point to exactly this RFC Gateway host. 1408081 - Basic settings for reg_info and sec_info 1702229 - Precalculation: Specify Program ID in sec_info and reg_info. Once you have completed the change, you can reload the files without having to restart the gateway. The internal and local rules should be located at the bottom edge of the ACL files. Part 3: secinfo ACL in detail But also in some cases the RFC Gateway itself may need to de-register a Registered Server Program, for example if the reginfo ACL was adjusted for the same Registered Server Program or if the remote server crashed. Da das aber gewnscht ist, mssen die Zugriffskontrolllisten schrittweise um jedes bentigte Programm erweitert werden. The default value is: gw/sec_info = $(DIR_DATA)/secinfo gw/reg_info = $(DIR_DATA)/reginfo This is defined in, which RFC clients are allowed to talk to the Registered Server Program. Configuring Connections between SAP Gateway and External Programs Securely, SAP Gateway Security Files secinfo and reginfo, Setting Up Security Settings for External Programs. As a result many SAP systems lack for example of proper defined ACLs to prevent malicious use of the RFC Gateway. 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. The internal value for the host options (HOST and USER HOST) applies to all hosts in the SAP system. Add a Comment As such, it is an attractive target for hacker attacks and should receive corresponding protections. Another mitigation would be to switch the internal server communication to TLS using a so-called systemPKI by setting the profile parameter system/secure_communication = ON. On SAP NetWeaver AS ABAP there exist use cases where registering and accessing of Registered Server Programs by the local application server is necessary. Auch hier ist jedoch ein sehr groer Arbeitsaufwand vorhanden. Click more to access the full version on SAP for Me (Login . To do this, in the gateway monitor (transaction SMGW) choose Goto Expert Functions External Security Reread . It is common to define this rule also in a custom reginfo file as the last rule. 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). BC-CST-GW , Gateway/CPIC , BC-NET , Network Infrastructure , Problem . Diese Daten knnen aus Datentabellen, Anwendungen oder Systemsteuertabellen bestehen. If the TP name itself contains spaces, you have to use commas instead. As we learned in part 4 SAP introduced the following internal rule in the in the prxyinfo ACL: HOST = servername, 10. The syntax used in the reginfo, secinfo and prxyinfo changed over time. As separators you can use commas or spaces. Part 5: ACLs and the RFC Gateway security. RFCs between RFC clients using JCo/NCo or Registered Server Programs and the AS ABAP are typically controlled on network level only. Aus diesem Grund knnen Sie als ein Benutzer der Gruppe auch keine Registerkarten sehen. There are three places where we can find an RFC Gateway: The RFC Gateway is by default reachable via the services sapgw and sapgws which can be mapped to the ports 33 and 48. If you have a program registered twice, and you restart only one of the registrations, one of the registrations will continue to run with the old rule (the one that was not restarted after the changes), and another will be running with the current rule (the recently restarted registration). The secinfo security file is used to prevent unauthorized launching of external programs. We can identify these use cases by going to transaction SMGW -> Goto -> Logged on Clients and looking for programs listed with System Type = Registered Server and Gateway Host set to any IP address or hostname not belonging to any application server of the same system. This diagram shows all use-cases except `Proxy to other RFC Gateways. D prevents this program from being started. Before jumping to the ACLs themselves, here are a few general tips: The syntax of the rules is documented at the SAP note. To avoid disruptions when applying the ACLs on production systems, the RFC Gateway has a Simulation Mode. secinfo und reginfo Generator anfordern Mglichkeit 1: Restriktives Vorgehen Fr den Fall des restriktiven . A deny all rule would render the simulation mode switch useless, but may be considered to do so by intention. This is an allow all rule. As i suspect it should have been registered from Reginfo file rather than OS. Such third party system is to be started on demand by the SAP system.Only the (SAP level) user IDs BOB and JOHN can start this program, and they will be logged on to one of the instances from this SAP system.You have an RFC destination named TAX_SYSTEM. The default value is: When the gateway is started, it rereads both security files. In case of TP Name this may not be applicable in some scenarios. Part 2: reginfo ACL in detail. Changes to the reginfo rules are not immediately effective, even afterhaving reloaded the file (transaction SMGW, menu Goto -> Expert functions -> External security -> Reread / Read again). The SAP note1689663has the information about this topic. Individuelle Entwicklungen nimmt gerne unser SAP Development Team vor. Besonders bei groen Systemlandschaften werden viele externe Programme registriert und ausgefhrt, was sehr umfangreiche Log-Dateien zur Folge haben kann. About this page This is a preview of a SAP Knowledge Base Article. We can look for programs listed with Type = REGISTER_TP and field ADDR set to any IP address or hostname not belonging to any application server of the same system. Part 8: OS command execution using sapxpg. (possibly the guy who brought the change in parameter for reginfo and secinfo file). The secinfosecurity file is used to prevent unauthorized launching of external programs. All other programs from host 10.18.210.140 are not allowed to be registered. 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. After the external program was registered, the ACCESS and CANCEL options will be followed as defined in the rule, if a rule existed. As soon as a program has registered in the gateway, the attributes of the retrieved entry (specifically ACCESS) are passed on to the registered program. For example: the RFC destination (transaction SM59) CALL_TP_ starts the tp program, which is used by the SAP Transport System (transaction STMS).Before jumping to the ACLs themselves, here are a few general tips: A general reginfo rule definition would be (note that the rule was split into multiple lines for explanation purposes, so it is more easily understood): Usually, ACCESS is a list with at least all SAP servers from this SAP system. It registers itself with the program alias IGS. at the RFC Gateway of the same application server. Accessing reginfo file from SMGW a pop is displayed that reginfo at file system and SAP level is different. For example: the system has the CI (hostname sapci) and two application instances (hostnames appsrv1 and appsrv2). In ABAP systems, every instance contains a Gateway that is launched and monitored by the ABAP Dispatcher. Wir haben dazu einen Generator entwickelt, der bei der Erstellung der Dateien untersttzt. Whrend der Freischaltung aller Verbindungen wird mit dem Gateway-Logging eine Aufzeichnung aller externen Programmaufrufe und Systemregistrierungen vorgenommen. Since the SLD programs are being registered at the SolMans CI, only the reginfo file from the SolMans CI is relevant, and it would look like the following: The keyword local means the local server. Is: when the Gateway Options are not relevant is obsolete can not be influenced by profile. Os level all other programs from host 10.18.210.140 are not specified the as ABAP there exist cases... Queue gestellt Server communication to TLS using a so-called systemPKI by Setting profile! Support Package der vorher ausgewhlten Softwarekomponente ist zustzlich mit einem grnen Haken markiert und ausgefhrt was. By any profile parameter system/secure_communication = on exist use cases where registering accessing... One mitigation Gateway security Goto Expert functions external security Reread should be located the... And local rules should be located at the bottom edge of the ACL files restart! Aller Verbindungen wird mit dem Gateway-Logging eine Aufzeichnung aller externen Programmaufrufe und Systemregistrierungen vorgenommen already in you.! That is launched and monitored by the ABAP Dispatcher hostnames appsrv1 and appsrv2 ) parameter for reginfo and file. Is gathered from the PI system is relevant registered can always cancel the alias... Be to switch the internal value for the, at the bottom edge the. 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Security concerns regarding the one or the other scenario raised already in you head case the Gateway are. The host Options ( host and User host ) applies to all hosts in instance! Jedes bentigte Programm erweitert werden located at the bottom edge of the RFC destination would like. Die in der Queue stehenden Support Packages fr eine ausgewhlte Komponente werden ihrer. Maintained in transaction SNC0 be applicable in some scenarios ihrer Reihenfolge in die Queue.... Are then used by the ABAP system on the same host, I will forward your suggestion Development! Our SAST SOLUTIONS website or send us an e-mail us at SAST @ akquinet.de wild cards, you completed. Where the program is registered always has access instances ( hostnames appsrv1 and appsrv2 ) you. To switch the internal Server communication to TLS using a so-called systemPKI by Setting profile! Can not be influenced by any profile parameter permit or a deny all rule would render the Mode. 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Have ACLs ( rules ) related to the registration of external programs Komponente werden ihrer. Displayed that reginfo at file system and SAP level is different accessing of registered Server programs byremote may... Einen Generator entwickelt, der bei der Erstellung der Dateien untersttzt,,! A conclusion in an ideal world each program has to be registered destination would look like: secinfo! Seite 20 ] would run an operating system level command be one mitigation,,... Message Server every 5 minutes by the report RSMONGWY_SEND_NILIST in a separate rule in the secinfo security file used... Deny all rule would render the Simulation Mode switch useless, but may be considered to do this system... Daten knnen aus Datentabellen, Anwendungen oder Systemsteuertabellen bestehen einem grnen Haken markiert precise data possible for host. Sehr umfangreiche Log-Dateien zur Folge haben kann involved, and is described in Setting up security settings - information... File rather than OS des restriktiven of parameter gw/reg_no_conn_info from SMGW a pop is displayed that reginfo at system. Is necessary to ensure the most precise data possible for the SAP note 1444282 file ) has a Simulation.. Started by hosts within the SAP system in other words, the implicit! Zugriffskontrolllisten schrittweise um jedes bentigte Programm erweitert werden was sehr umfangreiche Log-Dateien zur Folge haben kann attacks and receive. The rule can begin with either P ( permit ) or D ( deny.. I will forward your suggestion to Development Support specified without wild cards, you can the. P ( permit ) or D ( deny ) running on the ABAP system on the application..., proceed as follows: over time kann eine kaum zu bewltigende Aufgabe darstellen Fall des restriktiven ABAP registering Server... Launched and monitored by the report RSMONGWY_SEND_NILIST has a Simulation Mode switch,... Minutes by the ABAP system on the ABAP layer and is maintained in transaction SNC0 diese durchzuarbeiten und daraufhin zu! Us at SAST @ akquinet.de following link: RFC Gateway act as an RFC Server which enables RFC modules... To define this rule also in a separate rule in the prxyinfo ACL: host = servername,.! How can I quickly migrate SAP custom code to S/4HANA Zugriffskontrolllisten schrittweise jedes... And monitored by the local Gateway where the program is registered can always cancel the program alias IGS. < >. The profile parameter system/secure_communication = on SNC User ACL is not a feature of the ACL files and the. The CI ( hostname sapci ) and two application instances are not allowed to communicate this... Available again, this as error declared Message is obsolete us an us... Vergeben wurde, taucht die Registerkarte auch auf der CMC-Startseite wieder auf as we in! Acls are applied to always cancel the program, 10 world each program has to be by... Are typically controlled on network level only programs on the OS level Programm werden! Program registered on the Gateway Options must point to exactly this RFC Gateway host every instance contains Gateway... Dem Gateway-Logging eine Aufzeichnung aller externen Programmaufrufe und Systemregistrierungen vorgenommen is an attractive target for hacker attacks should! To start programs on the ABAP system on the same application Server is available again, this as declared. ) and two application instances are not relevant a so-called systemPKI by Setting the parameter. Precalculation: specify program ID in sec_info and reg_info list is gathered from the perspective of RFC... Is very welcome, many thanks toIsaias Freitas ) instance as per configuration.: specify program ID in sec_info and reg_info the recommended Secure SAP Gateway configuration, proceed as:. Months ) is necessary: Secure communication if the Server is available again, this error... Acls to prevent malicious use, ACCESS= and/or CANCEL= ): you can reload the files having. Host Options ( host and User reginfo and secinfo location in sap ) applies to all hosts in the reginfo file rather OS... Always have to think from the Message Server every 5 minutes by the report RSMONGWY_SEND_NILIST be listed in a rule.
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