Additional ACLs are discussed at this WIKI page. In other words, the SAP instance would run an operating system level command. RFCs between two SAP NetWeaver AS ABAP systems are typically controlled on network level only. 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. If no cancel list is specified, any client can cancel the program. Somit knnen keine externe Programme genutzt werden. Please note: The proxying RFC Gateway will additionally check its reginfo and secinfo ACL if the request is permitted. When editing these ACLs we always have to think from the perspective of each RFC Gateway to which the ACLs are applied to. That part is talking about securing the connection to the Message Server, which will prevent tampering with they keyword "internal", which can be used on the RFC Gateway security ACL files. The keyword local will be substituted at evaluation time by a list of IP addresses belonging to the host of the RFC Gateway. The wildcard * should be strongly avoided. 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. Part 8: OS command execution using sapxpg, if it specifies a permit or a deny. Bei groen Systemlandschaften ist dieses Verfahren sehr aufwndig. The secinfosecurity file is used to prevent unauthorized launching of external programs. In einer Dialogbox knnen Sie nun definieren, welche Aktionen aufgezeichnet werden sollen. (possibly the guy who brought the change in parameter for reginfo and secinfo file). You can define the file path using profile parameters gw/sec_infoand gw/reg_info. Very good post. 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. 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). As a result many SAP systems lack for example of proper defined ACLs to prevent malicious use of the RFC Gateway. Program foo is only allowed to be used by hosts from domain *.sap.com. All programs started by hosts within the SAP system can be started on all hosts in the system. This publication got considerable public attention as 10KBLAZE. TP is restricted to 64 non-Unicode characters for both secinfo and reginfo files. Part 8: OS command execution using sapxpg. Then the file can be immediately activated by reloading the security files. However, if in your scenario the same rules apply to all instances ofthe system, you can use a central file (see the SAP note. 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 destination would look like: The secinfo files from the application instances are not relevant. To control access from the client side too, you can define an access list for each entry. In the gateway monitor (SMGW) choose Goto Logged On Clients , use the cursor to select the registered program, and choose Goto Logged On Clients Delete Client . RFCs between RFC clients using JCo/NCo or Registered Server Programs and the AS ABAP are typically controlled on network level only. Da das aber gewnscht ist, mssen die Zugriffskontrolllisten schrittweise um jedes bentigte Programm erweitert werden. Part 2: reginfo ACL in detail. Save ACL files and restart the system to activate the parameters. D prevents this program from being started. 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. 2. You must keep precisely to the syntax of the files, which is described below. Once you have completed the change, you can reload the files without having to restart the gateway. Mglichkeit 2: Logging-basiertes Vorgehen Eine Alternative zum restriktiven Verfahren ist das Logging-basierte Vorgehen. 3. It is important to mention that the Simulation Mode applies to the registration action only. The default configuration of an ASCS has no Gateway. Maybe some security concerns regarding the one or the other scenario raised already in you head. Check the availability and use SM59 to ping all TP IDs.In the case of an SCS/ASCS instance, it cannot be reloaded via SMGW. HOST = servername, 10. It is common to define this rule also in a custom reginfo file as the last rule. USER=mueller, HOST=hw1414, TP=test: The user mueller can execute the test program on the host hw1414. 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. Please note: In most cases the registered program name differs from the actual name of the executable program on OS level. It registers itself with the program alias IGS. at the RFC Gateway of the same application server. There aretwo parameters that control the behavior of the RFC Gateway with regards to the security rules. Darber hinaus stellt die dauerhafte manuelle Freischaltung einzelner Verbindungen einen stndigen Arbeitsaufwand dar. Please note: One should be aware that starting a program using the RFC Gateway is an interactive task. Here, activating Gateway logging and evaluating the log file over an appropriate period (e.g. There may also be an ACL in place which controls access on application level. 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). Firstly review what is the security level enabled in the instance as per the configuration of parameter gw/reg_no_conn_info. BC-CST-GW , Gateway/CPIC , BC-NET , Network Infrastructure , Problem . As i suspect it should have been registered from Reginfo file rather than OS. Accesscould be restricted on the application level by the ACL file specified by profile parameter ms/acl_info. However, there is no need to define an explicit Deny all rule, as this is already implied (except in simulation mode). Please make sure you have read at least part 1 of this series to be familiar with the basics of the RFC Gateway and the terms i use to describe things. 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). Examples of valid addresses are: Number (NO=): Number between 0 and 65535. 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. (possibly the guy who brought the change in parameter for reginfo and secinfo file). 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. Observation: in emergency situations, follow these steps in order to disable the RFC Gateway security. Part 5: Security considerations related to these ACLs. Sie knnen die Queue-Auswahl reduzieren. The reginfo file have ACLs (rules) related to the registration of external programs (systems) to the local SAP instance. If this client does not match the criteria in the CANCEL list, then it is not able to cancel a registered program. 3. Only the first matching rule is used (similarly to how a network firewall behaves). Ausfhrliche Erluterungen zur Funktionsweise und zur Einstellung des Kollektors finden Sie in der SAP-Onlinehilfe sowie in den SAP-Hinweisen, die in Anhang E zusammengestellt sind. Most of the cases this is the troublemaker (!) Part 6: RFC Gateway Logging. The network service that, in turn, manages the RFC communication is provided by the RFC Gateway. P means that the program is permitted to be registered (the same as a line with the old syntax). Please make sure you have read part 1 4 of this series. 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). 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. File reginfocontrols the registration of external programs in the gateway. 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. All other programs starting with cpict4 are allowed to be started (on every host and by every user). The local gateway where the program is registered always has access. This way, each instance will use the locally available tax system. Please assist ASAP. After the external program was registered, the ACCESS and CANCEL options will be followed as defined in the rule, if a rule existed. It is configured to start the tax calculation program at the CI of the SAP system, as the tax system is installed only there. Terms of use | secinfo und reginfo Generator anfordern Mglichkeit 1: Restriktives Vorgehen Fr den Fall des restriktiven . The reginfo file has the following syntax. P USER=* USER-HOST=internal,local HOST=internal,local TP=*. You can also control access to the registered programs and cancel registered programs. The Gateway is a central communication component of an SAP system. 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. Please assist me how this change fixed it ? 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. This publication got considerable public attention as 10KBLAZE. Fr die gewnschten Registerkarten "Gewhren" auswhlen. Unfortunately, in this directory are also the Kernel programs saphttp and sapftp which could be utilized to retrieve or exfiltrate data. The RFC Gateway does not perform any additional security checks. In the previous parts we had a look at the different ACLs and the scenarios in which they are applied. 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. All subsequent rules are not checked at all. 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. Besonders bei groen Systemlandschaften werden viele externe Programme registriert und ausgefhrt, was sehr umfangreiche Log-Dateien zur Folge haben kann. In case you dont want to use the keyword, each instance would need a specific rule. Please follow me to get a notification once i publish the next part of the series. The default value is: gw/sec_info = $(DIR_DATA)/secinfo gw/reg_info = $(DIR_DATA)/reginfo File reginfo controls the registration of external programs in the gateway. Die zu der berechneten Queue gehrenden Support Packages sind grn unterlegt. RFC had issue in getting registered on DI. All of our custom rules should bee allow-rules. This can be replaced by the keyword "internal" (see examples below, at the "reginfo" section). 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. Its location is defined by parameter gw/prxy_info. The wildcard * should not be used at all. However, the RFC Gateway would still be involved, and it would still be the process to enforce the security rules. All other programs from host 10.18.210.140 are not allowed to be registered. The order of the remaining entries is of no importance. The Stand-alone RFC Gateway: As a dedicated RFC Gateway serving for various RFC clients or as an additional component which may be used to extend a SAP NW AS ABAP or AS Java system. Besttigen Sie den auftauchenden Hinweis und vergeben Sie fr die gewnschten Gruppen zumindest das folgende Recht: Allgemein --> Allgemein --> Objekte Anzeigen. Accessing reginfo file from SMGW a pop is displayed thatreginfo at file system and SAP level is different. Auerdem nimmt die Datenbank auch neue Informationen der Anwender auf und sichert diese ab. 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. An example could be the integration of a TAX software. This means the call of a program is always waiting for an answer before it times out. So lets shine a light on security. 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. Prior to the change in the reginfo and Secinfo the rfc was defined on THE dialogue instance and IT was running okay. As we learned in part 3 SAP introduced the following internal rule in the in the secinfo ACL: Part 8: OS command execution using sapxpg. For this scenario a custom rule in the reginfo ACL would be necessary, e.g., P TP= HOST= ACCESS=internal,local CANCEL=internal,local,. Please note: The wildcard * is per se supported at the end of a string only. secinfo: P TP=* USER=* USER-HOST=* HOST=*. CANNOT_DETERMINE_EPS_PARCEL: Die OCS-Datei ist in der EPS-Inbox nicht vorhanden; vermutlich wurde sie gelscht. Note: depending on the systems settings, it will not be the RFC Gateway itself that will start the program. To display the security files, use the gateway monitor in AS ABAP (transaction SMGW). Das von Ihnen gewhlte hchste Support Package der vorher ausgewhlten Softwarekomponente ist zustzlich mit einem grnen Haken markiert. 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)). For example: the system has the CI (hostname sapci) and two application instances (hostnames appsrv1 and appsrv2). Programs within the system are allowed to register. Accessing reginfo file from SMGW a pop is displayed that reginfo at file system and SAP level is different. Durch einen Doppelklick auf eine Zeile erhalten Sie detaillierte Informationen ber die Task- Typen auf den einzelnen Rechnern. Part 7: Secure communication 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. 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. Part 5: ACLs and the RFC Gateway security. They also have a video (the same video on both KBAs) illustrating how the reginfo rules work. The syntax used in the reginfo, secinfo and prxyinfo changed over time. 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. Registered Server Programs at a standalone RFC Gateway may be used to integrate 3rd party technologies. Host Name (HOST=, ACCESS= and/or CANCEL=): The wildcard character * stands for any host name, *.sap.com for a domain, sapprod for host sapprod. 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. Its functions are then used by the ABAP system on the same host. (any helpful wiki is very welcome, many thanks toIsaias Freitas). In case the files are maintained, the value of this parameter is irrelevant; and with parmgw/reg_no_conn_info, all other sec-checks can be disabled =>SAP note1444282, obviously this parm default is set to 1 ( if not set in profile file ) in kernel-773, I wasted a whole day unsuccessfully trying to configure the (GW-Sec) in a new system, sorry for my bad mood. 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')). Access to this ports is typically restricted on network level. Trademark. 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. 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. Anwendungsprogramme ziehen sich die bentigten Daten aus der Datenbank. 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. 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). You can tighten this authorization check by setting the optional parameter USER-HOST. 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. 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. For all Gateways, a sec_info-ACL, a prxy_info-ACL and a reg_info-ACL file must be available. RFC had issue in getting registered on DI. Danach wird die Queue neu berechnet. The reginfo file have ACLs (rules) related to the registration of external programs (systems) to the local SAP instance. 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 case of AS ABAP for example it may be defined as $(DIR_GLOBAL)$(DIR_SEP)security$(DIR_SEP)data$(DIR_SEP)$(FN_SEC_INFO) to make sure all RFC Gateways of the application servers of the same system relay on the same configuration. Before jumping to the ACLs themselves, here are a few general tips: The syntax of the rules is documented at the SAP note. 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. Program hugo is allowed to be started on every local host and by every user. This ACL is applied on the ABAP layer and is maintained in table USERACLEXT, for example using transaction SM30. 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