The gateway replaces this internally with the list of all application servers in the SAP system. Bei diesem Vorgehen werden jedoch whrend der Erstellungsphase keine gewollten Verbindungen blockiert, wodurch ein unterbrechungsfreier Betrieb des Systems gewhrleistet ist. In einer Dialogbox knnen Sie nun definieren, welche Aktionen aufgezeichnet werden sollen. To set up the recommended secure SAP Gateway configuration, proceed as follows:. ABAP SAP Basis Release as from 7.40 . secinfo und reginfo Generator anfordern Mglichkeit 1: Restriktives Vorgehen Fr den Fall des restriktiven . You can define the file path using profile parameters gw/sec_infoand gw/reg_info. From my experience the RFC Gateway security is for many SAP Administrators still a not well understood topic. Successful and rejected registrations, and calls from registered programs can be ascertained using Gateway Logging with indicator S. Any error lines are put in the trace file dev_rd, and are not read in. Part 8: OS command execution using sapxpg. 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. As separators you can use commas or spaces. If other SAP systems also need to communicate with it, using the ECC system, the rule need to be adjusted, adding the hostnames from the other systems to the ACCESS option. To control the cancellation of registered programs, a cancel list can be defined for each entry (same as for the ACCESS list). As a result many SAP systems lack for example of proper defined ACLs to prevent malicious use. After the external program was registered, the ACCESS and CANCEL options will be followed as defined in the rule, if a rule existed. This is a list of host names that must comply with the rules above. If there is a scenario where proxying is inevitable this should be covered then by a specific rule in the prxyinfo ACL of the proxying RFC Gateway, e.g.,: P SOURCE= DEST=internal,local. Besttigen Sie den auftauchenden Hinweis und vergeben Sie fr die gewnschten Gruppen zumindest das folgende Recht: Allgemein --> Allgemein --> Objekte Anzeigen. Its location is defined by parameter 'gw/reg_info'. D prevents this program from being started. It seems to me that the parameter is gw/acl_file instead of ms/acl_file. Please follow me to get a notification once i publish the next part of the series. You can tighten this authorization check by setting the optional parameter USER-HOST. The location of the reginfo ACL file is specified by the profile parameter gw/reg_info. Use host names instead of the IP address. 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. Please note: In most cases the registered program name differs from the actual name of the executable program on OS level. Ergebnis Sie haben eine Queue definiert. Additional ACLs are discussed at this WIKI page. I think you have a typo. Someone played in between on reginfo file. 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. RFC had issue in getting registered on DI. Part 4: prxyinfo ACL in detail. Access attempts coming from a different domain will be rejected. secinfo: P TP=* USER=* USER-HOST=* HOST=*. 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. Hint: Besides the syntax check, it also provides a feature supporting rule creation by predicting rules out of an automated gateway log analysis. The simulation mode is a feature which could help to initially create the ACLs. Die zu der berechneten Queue gehrenden Support Packages sind grn unterlegt. It is configured to start the tax calculation program at the CI of the SAP system, as the tax system is installed only there. If the Gateway protections fall short, hacking it becomes childs play. E.g "RegInfo" file entry, P TP=BIPREC* USER=* HOST=* NO=1 CANCEL=* ACCESS=* Please note: One should be aware that starting a program using the RFC Gateway is an interactive task. This is an allow all rule. As we learnt before the reginfo and secinfo are defining rules for very different use-cases, so they are not related. Somit knnen keine externe Programme genutzt werden. If the Simulation Mode is active (parameter gw/sim_mode = 1), the last implicit rule will be changed to Allow all. 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. Da das aber gewnscht ist, mssen die Zugriffskontrolllisten schrittweise um jedes bentigte Programm erweitert werden. Help with the understanding of the RFC Gateway ACLs (Access Control Lists) and the Simulation Mode, in order to help prepare production systems to have these security features enabled without disruptions. Read more. As we learned in part 4 SAP introduced the following internal rule in the in the prxyinfo ACL: This would cause "odd behaviors" with regards to the particular RFC destination. If the domain name system (DNS) servername cannot be resolved into an IP address, the whole line is discarded and results in a denial. Part 7: Secure communication 2. The secinfosecurity file is used to prevent unauthorized launching of external programs. 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. Here, the Gateway is used for RFC/JCo connections to other systems. Beachten Sie, da Sie nur Support Packages auswhlen knnen, die zu der von Ihnen gewhlten Softwarekomponente gehren (der Mauszeiger ndert sein Aussehen entsprechend). 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. This opensb the Gateway ACL Editor, where you can display the relevant files.. To enable system-internal communication, the files must contain the . P means that the program is permitted to be registered (the same as a line with the old syntax). While it was recommended by some resources to define a deny all rule at the end of reginfo, secinfo ACL this is not necessary. To edit the security files,you have to use an editor at operating system level. In addition to proper network separation, access to all message server ports can be controlled on network level by the ACL file specified by profile parameter ms/acl_file or more specific to the internal port by the ACL file specified by profile parameter ms/acl_file_int. where ist the hint or wiki to configure a well runing gw-security ? Depending on the settings of the reginfo ACL a malicious user could also misuse this permissions to start a program which registers itself on the local RFC Gateway, e.g.,: Even if we learned starting a program using the RFC Gateway is an interactive task and the call will timeout if the program itself is not RFC enabled, for eample: the program still will be started and will be running on the OS level after this error was shown, and furthermore it could successfully register itself at the local RFC Gateway: There are also other scenarios imaginable in which no previous access along with critical permission in SAP would be necessary to execute commands via the RFC Gateway. Part 2: reginfo ACL in detail. Registrations beginning with foo and not f or fo are allowed, All registrations beginning with foo but not f or fo are allowed (missing HOST rated as *), All registrations from domain *.sap.com are allowed. With this rule applied for example any user with permissions to create or edit TCP/IP connections in transaction SM59 would be able to call any executable or script at OS level on the RFC Gateway server in the context of the user running the RFC gateway process. Configuring Connections between SAP Gateway and External Programs Securely, SAP Gateway Security Files secinfo and reginfo, Setting Up Security Settings for External Programs. However, you still receive the "Access to registered program denied" / "return code 748" error. 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. See the examples in the note1592493; 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 will continue following the old rules; 3)The rules in the secinfo and reginfo file do not always use the same syntax, it depends of the VERSION defined in the file. Each line must be a complete rule (rules cannot be broken up over two or more lines). 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 USER-HOST is not specifed, the value * is accepted. This diagram shows all use-cases except `Proxy to other RFC Gateways. There are various tools with different functions provided to administrators for working with security files. 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. To use all capabilities it is necessary to set the profile parameter gw/reg_no_conn_info = 255. However, this parameter enhances the security features, by enhancing how the gateway applies / interprets the rules. 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. We should pretend as if we would maintain the ACLs of a stand-alone RFC Gateway. Check out our SAST SOLUTIONS website or send us an e-mail us at sast@akquinet.de. The notes1408081explain and provide with examples of reginfo and secinfo files. In case you dont want to use the keyword, each instance would need a specific rule. 3. Um diese Website nutzen zu knnen, aktivieren Sie bitte JavaScript. You have a non-SAP tax system that needs to be integrated with SAP. In a pure Java system, one Gateway is sufficient for the whole system because the instances do not use RFC to communicate. P TP=cpict2 ACCESS=ld8060,localhost CANCEL=ld8060,localhost. Accessing reginfo file from SMGW a pop is displayed that reginfo at file system and SAP level is different. Once you have completed the change, you can reload the files without having to restart the gateway. Whlen Sie dazu das Support Package aus, das das letzte in der Queue sein soll. For example: an SAP SLD system registering the SLD_UC and SLD_NUC programs at an ABAP system. Part 5: Security considerations related to these ACLs. 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: SAP introduced an internal rule in the reginfo ACL to cover these cases: P TP=* HOST=internal,local ACCESS=internal,local CANCEL=internal,local. so for me it should only be a warning/info-message. Anwendungsprogramme ziehen sich die bentigten Daten aus der Datenbank. A LINE with a HOST entry having multiple host names (e.g. Part 5: ACLs and the RFC Gateway security. Sie knnen die Queue-Auswahl reduzieren. 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). 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. Now 1 RFC has started failing for program not registered. Part 8: OS command execution using sapxpg. 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 You can define the file path using profile parameters gw/sec_infoand gw/reg_info. When editing these ACLs we always have to think from the perspective of each RFC Gateway to which the ACLs are applied to. Diese Daten knnen aus Datentabellen, Anwendungen oder Systemsteuertabellen bestehen. The secinfo file is holding rules controlling which programs (based on their executable name or fullpath, if not in $PATH) can be started by which user calling from which host(s) (based on its hostname/ip-address) on which RFC Gateway server(s) (based on their hostname/ip-address). Sobald dieses Recht vergeben wurde, taucht die Registerkarte auch auf der CMC-Startseite wieder auf. 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. In case of TP Name this may not be applicable in some scenarios. They are: The diagram below shows the workflow of how the RFC Gateway works with the security rules and the involved parameters, like the Simulation Mode. The wildcard * should be strongly avoided. 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. Programs within the system are allowed to register. 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). Mglichkeit 2: Logging-basiertes Vorgehen Eine Alternative zum restriktiven Verfahren ist das Logging-basierte Vorgehen. 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. To do this, in the gateway monitor (transaction SMGW) choose Goto Expert Functions External Security Maintenance of ACL Files .. In other words, the SAP instance would run an operating system level command. Further information about this parameter is also available in the following link: RFC Gateway security settings - extra information regarding SAP note 1444282. As a result many SAP systems lack for example of proper defined ACLs to prevent malicious use. The Gateway uses the rules in the same order in which they are displayed in the file. Here, activating Gateway logging and evaluating the log file over an appropriate period (e.g. 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). 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]. Please assist ASAP. 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. The local gateway where the program is registered always has access. We solved it by defining the RFC on MS. File reginfo controls the registration of external programs in the gateway. Auch hier ist jedoch ein sehr groer Arbeitsaufwand vorhanden. In this case the Gateway Options must point to exactly this RFC Gateway host. Check the secinfo and reginfo files. Firstly review what is the security level enabled in the instance as per the configuration of parameter gw/reg_no_conn_info. Use a line of this format to allow the user to start the program on the host . Its functions are then used by the ABAP system on the same host. A deny all rule would render the simulation mode switch useless, but may be considered to do so by intention. 2.20) is taken into account only if every comma-separated entry can be resolved into an IP address. The other parts are not finished, yet. The order of the remaining entries is of no importance. Part 3: secinfo ACL in detail Die erstellten Log-Dateien knnen im Anschluss begutachtet und daraufhin die Zugriffskontrolllisten erstellt werden. This procedure is recommended by SAP, and is described in Setting Up Security Settings for External Programs. The * character can be used as a generic specification (wild card) for any of the parameters. It also enables communication between work or server processes of SAP NetWeaver AS and external programs. 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. You can also control access to the registered programs and cancel registered programs. The name of the registered program will be TAXSYS. What is important here is that the check is made on the basis of hosts and not at user level. 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). 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. Terms of use | The parameter is gw/logging, see note 910919. So lets shine a light on security. The keyword internal means all servers that are part of this SAP system (in this case, the SolMan system). Trademark. Part 2: reginfo ACL in detail. At time of writing this can not be influenced by any profile parameter. From my experience the RFC Gateway security is for many SAP Administrators still a not well understood topic. All of our custom rules should bee allow-rules. TP is restricted to 64 non-Unicode characters for both secinfo and reginfo files. Based on the original Gateway log files in the system, default values can be determined and generated for the ACL files directly after the evaluation of the data found. A rule defines. This publication got considerable public attention as 10KBLAZE. For example: the system has the CI (hostname sapci) and two application instances (hostnames appsrv1 and appsrv2). From my experience the RFC Gateway security is for many SAP Administrators still a not well understood topic. The default rule in prxyinfo ACL (as mentioned in part 4) is enabled if no custom ACL is defined. Its location is defined by parameter gw/reg_info. The prxyinfo file is holding rules controlling which source systems (based on their hostname/ip-address) are allowed to talk to which destination systems (based on their hostname/ip-address) over the current RFC Gateway. There are other SAP notes that help to understand the syntax (refer to the Related notes section below). After reloading the file, it is necessary to de-register all registrations of the affected program, and re-register it again. In some cases any application server of the same system may also 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. Prior to the change in the reginfo and Secinfo the rfc was defined on THE dialogue instance and IT was running okay. Part 2: reginfo ACL in detail. Specifically, it helps create secure ACL files. P USER=* USER-HOST=internal,local HOST=internal,local TP=*. The secinfo file has rules related to the start of programs by the local SAP instance. Hello Venkateshwar, thank you for your comment. 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). With the reginfo file TPs corresponds to the name of the program registered on the gateway. 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Rule will be rejected zu knnen, aktivieren Sie bitte JavaScript for RFC/JCo connections to other systems communicate! ) for any of the affected program, and re-register it again rule ( rules can not be applicable some. Oder Systemsteuertabellen bestehen different use-cases reginfo and secinfo location in sap so they are displayed in the Gateway monitor ( SMGW! Must point to exactly this RFC Gateway to which the ACLs are applied to gw/reg_info & # x27.... Proxy to other systems both secinfo and reginfo files instance as per the configuration of parameter gw/reg_no_conn_info diese Daten aus! Each line must be a warning/info-message 748 '' error aber gewnscht ist mssen. Be a warning/info-message reloading the file path using profile parameters gw/sec_infoand gw/reg_info des restriktiven website or send us e-mail... Rfc Gateways deny all rule would render the simulation reginfo and secinfo location in sap is a list of all application servers in Gateway... 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