As we learned in part 4 SAP introduced the following internal rule in the in the prxyinfo ACL: To control access from the client side too, you can define an access list for each entry. 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 2: reginfo ACL in detail. Limiting access to this port would be one mitigation. As i suspect it should have been registered from Reginfo file rather than OS. 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. The RFC Gateway act as an RFC Server which enables RFC function modules to be used by RFC clients. Part 4: prxyinfo ACL in detail. 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 addition, note that the system checks the case of all keywords and only takes keywords into account if they are written in upper case. 1. other servers had communication problem with that DI. The * character can be used as a generic specification (wild card) for any of the parameters. Evaluate the Gateway log files and create ACL rules. 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. A LINE with a HOST entry having multiple host names (e.g. To set up the recommended secure SAP Gateway configuration, proceed as follows:. 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. Please note: SNC System ACL is not a feature of the RFC Gateway itself. The local gateway where the program is registered always has access. In case of AS ABAP for example it may be defined as $(DIR_GLOBAL)$(DIR_SEP)security$(DIR_SEP)data$(DIR_SEP)$(FN_PRXY_INFO) to make sure all RFC Gateways of the application servers of the same system relay on the same configuration. Always document the changes in the ACL files. Da das aber gewnscht ist, mssen die Zugriffskontrolllisten schrittweise um jedes bentigte Programm erweitert werden. Of course the local application server is allowed access. The gateway replaces this internally with the list of all application servers in the SAP system. As we learned in part 3 SAP introduced the following internal rule in the in the secinfo ACL: There are two different syntax versions that you can use (not together). Save ACL files and restart the system to activate the parameters. This section contains information about the RFC Gateway ACLs, and examples of landscapes and rules.The reginfo file have ACLs (rules) related to the registration of external programs (systems) to the local SAP instance. 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. Part 6: RFC Gateway Logging 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. 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. After reloading the file, it is necessary to de-register all registrations of the affected program, and re-register it again. Should a cyberattack occur, this will give the perpetrators direct access to your sensitive SAP systems. where ist the hint or wiki to configure a well runing gw-security ? The message server port which accepts registrations is defined by profile parameter rdisp/msserv_internal. For example: an SAP SLD system registering the SLD_UC and SLD_NUC programs at an ABAP system. Part 5: ACLs and the RFC Gateway security. In other words, the SAP instance would run an operating system level command. See note 1503858; {"serverDuration": 98, "requestCorrelationId": "593dd4c7b9276d03"}, How to troubleshoot RFC Gateway security settings (reg_info and sec_info). This would cause "odd behaviors" with regards to the particular RFC destination. P means that the program is permitted to be registered (the same as a line with the old syntax). The secinfosecurity file is used to prevent unauthorized launching of external programs. About the second comment and the error messages, those are messages related to DNS lookup.I believe that these are raised as errors because they have occurred during the parsing of the reginfo file. 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. P SOURCE=* DEST=*. This diagram shows all use-cases except `Proxy to other RFC Gateways. The related program alias also known as TP Name is used to register a program at the RFC Gateway. 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. Part 1: General questions about the RFC Gateway and RFC Gateway 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. Please note: The wildcard * is per se supported at the end of a string only. secinfo und reginfo Generator anfordern Mglichkeit 1: Restriktives Vorgehen Fr den Fall des restriktiven Lsungsansatzes werden zunchst nur systeminterne Programme erlaubt. Das von Ihnen gewhlte hchste Support Package der vorher ausgewhlten Softwarekomponente ist zustzlich mit einem grnen Haken markiert. 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. The SAP note1689663has the information about this topic. Part 5: ACLs and the RFC Gateway security. so for me it should only be a warning/info-message. Please assist ASAP. At time of writing this can not be influenced by any profile parameter. 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). 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. Privacy |
SAP Gateway Security Files secinfo and reginfo, Configuring Connections between Gateway and External Programs Securely, Gateway security settings - extra information regarding SAP note 1444282, Additional Access Control Lists (Gateway), Reloading the reginfo - secinfo at a Standalone Gateway, SAP note1689663: GW: Simulation mode for reg_info and sec_info, SAP note1444282: gw/reg_no_conn_info settings, SAP note1408081: Basic settings for reg_info and sec_info, SAP note1425765: Generating sec_info reg_info, SAP note1069911: GW: Changes to the ACL list of the gateway (reginfo), SAP note614971: GW: Changes to the ACL list of the gateway (secinfo), SAP note910919: Setting up Gateway logging, SAP KBA1850230: GW: "Registration of tp not allowed", SAP KBA2075799: ERROR: Error (Msg EGW 748 not found), SAP KBA2145145: User is not authorized to start an external program, SAP KBA 2605523: [WEBINAR] Gateway Security Features, SAP Note 2379350: Support keyword internal for standalone gateway, SAP Note 2575406: GW: keyword internal on gwrd 749, SAP Note 2375682: GW: keyword internal lacks localhost as of 740. ooohhh my god, (It could not have been more complicated -obviously the sequence of lines is important): "# This must always be the last rule on the file see SAP note 1408081" + next line content, is not included as comment within the default-delivered reginfo file or secinfo file (after installation) -, this would save a lot ofwasted life time, gw/acl_mode: ( looks like to enable/disable the complete gw-security config, but ). As a result many SAP systems lack for example of proper defined ACLs to prevent malicious use of the RFC Gateway. However, you still receive the "Access to registered program denied" / "return code 748" error. Part 2: reginfo ACL in detail. You have an RFC destination named TAX_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. 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. Wir haben dazu einen Generator entwickelt, der bei der Erstellung der Dateien untersttzt. 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. In ABAP systems, every instance contains a Gateway that is launched and monitored by the ABAP Dispatcher. You can make dynamic changes by changing, adding, or deleting entries in the reginfo file. For all Gateways, a sec_info-ACL, a prxy_info-ACL and a reg_info-ACL file must be available. 2. In addition, the existing rules on the reginfo/secinfo file will be applied, even on Simulation Mode. 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. Its location is defined by parameter gw/sec_info. Part 5: ACLs and the RFC Gateway security. In case of TP Name this may not be applicable in some scenarios. Program cpict4 is allowed to be registered if it arrives from the host with address 10.18.210.140. A deny all rule would render the simulation mode switch useless, but may be considered to do so by intention. In these cases the program started by the RFC Gateway may also be the program which tries to register to the same RFC Gateway. Support Packages fr eine ausgewhlte Komponente werden entsprechend ihrer Reihenfolge in die Queue gestellt. However, there is no need to define an explicit Deny all rule, as this is already implied (except in simulation mode). 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. Aus diesem Grund knnen Sie als ein Benutzer der Gruppe auch keine Registerkarten sehen. 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Program cpict4 is allowed to be registered if it arrives from the host with address 10.18.210.140 server.
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