Examples of valid addresses are: Number (NO=): Number between 0 and 65535. The RFC Gateway act as an RFC Server which enables RFC function modules to be used by RFC clients. 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')). 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. In addition, the existing rules on the reginfo/secinfo file will be applied, even on Simulation Mode. Read more. Once you have completed the change, you can reload the files without having to restart the gateway. Only the secinfo from the CI is applicable, as it is the RFC Gateway from the CI that will be used to start the program (check the Gateway Options at the screenshot above). 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. 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. The wildcard * should not be used at all. You can make dynamic changes by changing, adding, or deleting entries in the reginfo file. At time of writing this can not be influenced by any profile parameter. 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. In summary, if the Simulation Mode is deactivated (parameter gw/sim_mode = 0; default value), the last implicit rule from the RFC Gateway will be Deny all as mentioned above, at the RFC Gateway ACLs (reginfo and secinfo) section. In case you dont want to use the keyword, each instance would need a specific rule. Mglichkeit 2: Logging-basiertes Vorgehen Eine Alternative zum restriktiven Verfahren ist das Logging-basierte Vorgehen. With this rule applied any RFC enabled program on any of the servers covered by the keyword internal is able to register itself at the RFC Gateway independent from which user started the corresponding executable on OS level (again refer to 10KBLAZE). Da das aber gewnscht ist, mssen die Zugriffskontrolllisten schrittweise um jedes bentigte Programm erweitert werden. The reginfo file have ACLs (rules) related to the registration of external programs (systems) to the local SAP instance. Es gibt folgende Grnde, die zum Abbruch dieses Schrittes fhren knnen: CANNOT_SKIP_ATTRIBUTE_RECORD: Die Attribute knnen in der OCS-Datei nicht gelesen werden. Check out our SAST SOLUTIONS website or send us an e-mail us at sast@akquinet.de. Copyright |
This is for clarity purposes. Alerting is not available for unauthorized users, Right click and copy the link to share this comment. NUMA steht fr Non-Uniform Memory Access und beschreibt eine Computer-Speicher-Architektur fr Multiprozessorsysteme, bei der jeder Prozessor ber einen eigenen, lokalen physischen Speicher verfgt, aber anderen Prozessoren ber einen gemeinsamen Adressraum direkten Zugriff darauf gewhrt (Distributed Shared Memory). File reginfocontrols the registration of external programs in the gateway. The secinfo file has rules related to the start of programs by the local SAP instance. Part 5: ACLs and the RFC Gateway security. Additional ACLs are discussed at this WIKI page. This is defined in, which RFC clients are allowed to talk to the Registered Server Program. Check the above mentioned SAP documentation about the particular of each version; 4)It is possible to enable the RFC Gateway logging in order to reproduce the issue. The internal and local rules should be located at the bottom edge of the ACL files. Check the secinfo and reginfo files. IP Addresses (HOST=, ACCESS= and/or CANCEL=): You can use IP addresses instead of host names. if the server is available again, this as error declared message is obsolete. 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. The Gateway uses the rules in the same order in which they are displayed in the file. 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. 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. It is common to define this rule also in a custom reginfo file as the last rule. Auch hier ist jedoch ein sehr groer Arbeitsaufwand vorhanden. The RFC Gateway can be seen as a communication middleware. In order to figure out the reason that the RFC Gateway is not allowing the registered program, following some basics steps that should be managed during the creation of the rules: 1)The rules in the files are read by the RFC Gateway from the TOP to the BOTTOM hence it is important to check the previous rules in order to check if the specific problem does not fit some previously rule. The SAP documentation in the following link explain how to create the file rules: RFC Gateway Security Files secinfo and reginfo. 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). Program cpict4 is not permitted to be started. The keyword internal means all servers that are part of this SAP system (in this case, the SolMan system). Note: depending on the systems settings, it will not be the RFC Gateway itself that will start the program. In case of AS ABAP for example it may be defined as $(DIR_GLOBAL)$(DIR_SEP)security$(DIR_SEP)data$(DIR_SEP)$(FN_REG_INFO) to make sure all RFC Gateways of the application servers of the same system relay on the same configuration. 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. If these profile parameters are not set the default rules would be the following allow all rules: reginfo: P TP=* 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. This diagram shows all use-cases except `Proxy to other RFC Gateways. No error is returned, but the number of cancelled programs is zero. Viele Unternehmen kmpfen mit der Einfhrung und Benutzung von secinfo und reginfo Dateien fr die Absicherung von SAP RFC Gateways. As a result many SAP systems lack for example of proper defined ACLs to prevent malicious use of the RFC Gateway. Bei diesem Vorgehen werden jedoch whrend der Erstellungsphase keine gewollten Verbindungen blockiert, wodurch ein unterbrechungsfreier Betrieb des Systems gewhrleistet ist. In these cases the program started by the RFC Gateway may also be the program which tries to register to the same RFC Gateway. Bei groen Systemlandschaften ist dieses Verfahren sehr aufwndig. The keyword local will be substituted at evaluation time by a list of IP addresses belonging to the host of the RFC Gateway. Program cpict2 is allowed to be registered, but can only be run and stopped on the local host or hostld8060. Haben Support Packages in der Queue Verbindungen zu Support Packages einer anderen Komponente (weitere Vorgngerbeziehung, erforderliches CRT) wird die Queue um weitere Support Packages erweitert, bis alle Vorgngerbeziehungen erfllt sind. The location of this ACL can be defined by parameter gw/acl_info. The message server port which accepts registrations is defined by profile parameter rdisp/msserv_internal. Part 4: prxyinfo ACL in detail. This parameter will allow you to reproduce the RFC Gateway access and see the TP and HOST that the access is using hence create the rules in the reginfo or secinfo file; 5)The rules defined in the reginfo or secinfo file can be reviewed in colored syntactic correctness. Thank you! I think you have a typo. How to guard your SAP Gateway against unauthorized calls, Study shows SAP systems especially prone to insider attacks, Visit our Pathlock Germany website https://pathlock.com/de/, Visit our Pathlock Blog: https://pathlock.com/de/blog/, SAST SOLUTIONS: Now member of Pathlock Group. Another example: you have a non-SAP tax system that will register a program at the CI of an SAP ECC system. Make sure that they are set as per the Notes: Note 1425765 - Generating sec_info reg_info Note 1947412 - MDM Memory increase and RFC connection error Wir haben dazu einen Generator entwickelt, der bei der Erstellung der Dateien untersttzt. Its functions are then used by the ABAP system on the same host. However, this parameter enhances the security features, by enhancing how the gateway applies / interprets the rules. As a result many SAP systems lack for example of proper defined ACLs to prevent malicious use. Support Packages fr eine ausgewhlte Komponente werden entsprechend ihrer Reihenfolge in die Queue gestellt. We should pretend as if we would maintain the ACLs of a stand-alone RFC Gateway. Would you like more information on our SAST SUITE or would you like to find out more about ALL ROUND protection of your SAP systems? Auch hier ist jedoch ein sehr groer Arbeitsaufwand vorhanden. Darber hinaus stellt die dauerhafte manuelle Freischaltung einzelner Verbindungen einen stndigen Arbeitsaufwand dar. In SAP NetWeaver Application Server Java: The SCS instance has a built-in RFC Gateway. As we learned in part 3 SAP introduced the following internal rule in the in the secinfo ACL: Auerdem nimmt die Datenbank auch neue Informationen der Anwender auf und sichert diese ab. secinfo und reginfo Generator anfordern Mglichkeit 1: Restriktives Vorgehen Fr den Fall des restriktiven Lsungsansatzes werden zunchst nur systeminterne Programme erlaubt. The subsequent blogs of will describe each individually. Its location is defined by parameter gw/sec_info. 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. 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). 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. How can I quickly migrate SAP custom code to S/4HANA? Someone played in between on reginfo file. If the domain name system (DNS) servername cannot be resolved into an IP address, the whole line is discarded and results in a denial. When using SNC to secure logon for RFC Clients or Registered Server Programs the so called SNC User ACL, also known as User Authentication, is introduced and must be maintained accordingly. Part 2: reginfo ACL in detail. Part 2: reginfo ACL in detail Sie knnen die Queue-Auswahl reduzieren. The RFC Gateway allows external RFC Server programs (also known as Registered Server or Registered Server Program) to register to itself and allows RFC clients to consume the functions offered by these programs. Limiting access to this port would be one mitigation. (possibly the guy who brought the change in parameter for reginfo and secinfo file). This also includes the loopback address 127.0.0.1 as well as its IPv6 equivalent ::1. Part 5: ACLs and the 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. For all Gateways, a sec_info-ACL, a prxy_info-ACL and a reg_info-ACL file must be available. 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. Part 3: secinfo ACL in detail. Besttigen Sie den auftauchenden Hinweis und vergeben Sie fr die gewnschten Gruppen zumindest das folgende Recht: Allgemein --> Allgemein --> Objekte Anzeigen. All programs started by hosts within the SAP system can be started on all hosts in the system. The first letter of the rule can begin with either P (permit) or D (deny). 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)). 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. Part 2: reginfo ACL in detail. This is because the rules used are from the Gateway process of the local instance. To prevent the list of application servers from tampering we have to take care which servers are allowed to register themselves at the Message Server as an application server. 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. Die erstellten Log-Dateien knnen im Anschluss begutachtet und daraufhin die Zugriffskontrolllisten erstellt werden. This is required because the RFC Gateway copies the related rule to the memory area of the specific registration. In a pure Java system, one Gateway is sufficient for the whole system because the instances do not use RFC to communicate. RFCs between two SAP NetWeaver AS ABAP systems are typically controlled on network level only. 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. 2. Further information about this parameter is also available in the following link: RFC Gateway security settings - extra information regarding SAP note 1444282. 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. The location of the reginfo ACL file is specified by the profile parameter gw/reg_info. The default rules of reginfo and secinfo ACL (as mentioned in part 2 and part 3) are enabled if either profile parameter gw/acl_mode = 1 is set or if gw/reg_no_conn_info includes the value 16 in its bit mask, and if no custom ACLs are defined. 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. 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. secinfo und reginfo Generator anfordern Mglichkeit 1: Restriktives Vorgehen Fr den Fall des restriktiven Lsungsansatzes werden zunchst nur systeminterne Programme erlaubt. The format of the first line is #VERSION=2, all further lines are structured as follows: Here the line starting with P or D, followed by a space or a TAB, has the following meaning: P means that the program is permitted to be started (the same as a line with the old syntax). 2. 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). Die erstellten Log-Dateien knnen im Anschluss begutachtet und daraufhin die Zugriffskontrolllisten erstellt werden. 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. 1. other servers had communication problem with that DI. 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. Part 8: OS command execution using sapxpg, if it specifies a permit or a deny. In these cases the program alias is generated with a random string. *. Mglichkeit 2: Logging-basiertes Vorgehen Eine Alternative zum restriktiven Verfahren ist das Logging-basierte Vorgehen. You can define the file path using profile parameters gw/sec_infoand gw/reg_info. You have already reloaded the reginfo file. Thus, part of your reginfo might not be active.The gateway is logging an error while performing name resolution.The operating system / DNS took 5 seconds to reply - 5006ms per the error message you posted; and the response was "host unknown".If the "HOST" argument on the reginfo rule from line 9 has only one host, then the whole rule is ignored as the Gateway could not determine the IP address of the server.Kind regards. While it was recommended by some resources to define a deny all rule at the end of reginfo, secinfo ACL this is not necessary. Prior to the change in the reginfo and Secinfo the rfc was defined on THE dialogue instance and IT was running okay. Each line must be a complete rule (rules cannot be broken up over two or more lines). All other programs starting with cpict4 are allowed to be started (on every host and by every user). After the external program was registered, the ACCESS and CANCEL options will be followed as defined in the rule, if a rule existed. 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