1. other servers had communication problem with that DI. 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). You have configured the SLD at the Java-stack of the SolMan system, using the RFC Gateway of the SolMans ABAP-stack. 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). Fr die gewnschten Registerkarten "Gewhren" auswhlen. Part 8: OS command execution using sapxpg. This can be replaced by the keyword "internal" (see examples below, at the "reginfo" section). Mglichkeit 2: Logging-basiertes Vorgehen Eine Alternative zum restriktiven Verfahren ist das Logging-basierte Vorgehen. P means that the program is permitted to be registered (the same as a line with the old syntax). 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). 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. This is defined in, how many Registered Server Programs with the same name can be registered. Its location is defined by parameter gw/reg_info. Example Example 1: Part 2: reginfo ACL in detail. RFC had issue in getting registered on DI. To control access from the client side too, you can define an access list for each entry. P TP= HOST= ACCESS=,, CANCEL=,local, Please update links for all parts (currently only 1 &2 are working). Part 5: ACLs and the RFC Gateway security. Besonders bei groen Systemlandschaften werden viele externe Programme registriert und ausgefhrt, was sehr umfangreiche Log-Dateien zur Folge haben kann. No error is returned, but the number of cancelled programs is zero. If the TP name has been specified without wild cards, you can specify the number of registrations allowed here. The Gateway uses the rules in the same order in which they are displayed in the file. The network service that, in turn, manages the RFC communication is provided by the RFC Gateway. Part 4: prxyinfo ACL in detail. Privacy |
From my experience the RFC Gateway security is for many SAP Administrators still a not well understood topic. How can I quickly migrate SAP custom code to S/4HANA? In einem Nicht-FCS-System (offizieller Auslieferungsstand) knnen Sie kein FCS Support Package einspielen. File reginfo controls the registration of external programs in the gateway. RFCs between RFC clients using JCo/NCo or Registered Server Programs and the AS ABAP are typically controlled on network level only. Durch einen Doppelklick auf eine Zeile erhalten Sie detaillierte Informationen ber die Task- Typen auf den einzelnen Rechnern. The SAP note1689663has the information about this topic. All subsequent rules are not checked at all. Evaluate the Gateway log files and create ACL rules. 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. This is a list of host names that must comply with the rules above. 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. D prevents this program from being started. 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. 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. 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. This is because the rules used are from the Gateway process of the local instance. Every attribute should be maintained as specific as possible. Furthermore the means of some syntax and security checks have been changed or even fixed over time. 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 gateway replaces this internally with the list of all application servers in the SAP system. USER=mueller, HOST=hw1414, TP=test: The user mueller can execute the test program on the host hw1414. Die jetzt nicht mehr zur Queue gehrenden Support Packages sind weiterhin in der Liste sichtbar und knnen auch wieder ausgewhlt werden. The RFC Gateway does not perform any additional security checks. This list is gathered from the Message Server every 5 minutes by the report RSMONGWY_SEND_NILIST. 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. In other words, the SAP instance would run an operating system level command. Datenbankschicht: In der Datenbank, welche auf einem Datenbankserver liegt, werden alle Daten eines Unternehmens gesichert. Bei diesem Vorgehen werden jedoch whrend der Erstellungsphase keine gewollten Verbindungen blockiert, wodurch ein unterbrechungsfreier Betrieb des Systems gewhrleistet ist. 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. 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 ). 3. This opensb the Gateway ACL Editor, where you can display the relevant files.. To enable system-internal communication, the files must contain the . 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 message server port which accepts registrations is defined by profile parameter rdisp/msserv_internal. Please note: SNC System ACL is not a feature of the RFC Gateway itself. TP is a mandatory field in the secinfo and reginfo files. It registers itself with the program alias IGS. at the RFC Gateway of the same application server. As a result many SAP systems lack for example of proper defined ACLs to prevent malicious use. If the TP name itself contains spaces, you have to use commas instead. If you set it to zero (highlynotrecommended), the rules in the reginfo/secinfo/proxy info files will still be applied. Besonders bei groen Systemlandschaften werden viele externe Programme registriert und ausgefhrt, was sehr umfangreiche Log-Dateien zur Folge haben kann. Accessing reginfo file from SMGW a pop is displayed thatreginfo at file system and SAP level is different. 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. It seems to me that the parameter is gw/acl_file instead of ms/acl_file. 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 parameter is gw/logging, see note 910919. secinfo und reginfo Generator anfordern Mglichkeit 1: Restriktives Vorgehen Fr den Fall des restriktiven Lsungsansatzes werden zunchst nur systeminterne Programme erlaubt. To permit registered servers to be used by local application servers only, the file must contain the following entry. 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. It is common to define this rule also in a custom reginfo file as the last rule. 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. Please note: In most cases the registered program name differs from the actual name of the executable program on OS level. TP is restricted to 64 non-Unicode characters for both secinfo and reginfo files. Only the first matching rule is used (similarly to how a network firewall behaves). You must keep precisely to the syntax of the files, which is described below. Here, activating Gateway logging and evaluating the log file over an appropriate period (e.g. This ACL is applied on the ABAP layer and is maintained in transaction SNC0. 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 5: ACLs and the RFC Gateway security. This way, each instance will use the locally available tax system. If no cancel list is specified, any client can cancel the program. You have already reloaded the reginfo file. The RFC Gateway act as an RFC Server which enables RFC function modules to be used by RFC clients. Program cpict4 is not permitted to be started. 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. Part 4: prxyinfo ACL in detail. If this addition is missing, any number of servers with the same ID are allowed to log on. secinfo und reginfo Generator anfordern Mglichkeit 1: Restriktives Vorgehen Fr den Fall des restriktiven . In other words the same host running the ABAP system is also running the SAP IGS, for example the integrated IGS (as part of SAP NW AS ABAP) may be started on the application servers host during the start procedure of the ABAP system. In SAP NetWeaver Application Server ABAP: Every Application Server has a built-in RFC Gateway. 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. Whrend der Freischaltung aller Verbindungen wird mit dem Gateway-Logging eine Aufzeichnung aller externen Programmaufrufe und Systemregistrierungen vorgenommen. 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 einer Dialogbox knnen Sie nun definieren, welche Aktionen aufgezeichnet werden sollen. Alerting is not available for unauthorized users, Right click and copy the link to share this comment. Auch hier ist jedoch ein sehr groer Arbeitsaufwand vorhanden. The RFC Gateway can be seen as a communication middleware. For this scenario a custom rule in the reginfo ACL would be necessary, e.g., P TP= HOST= ACCESS=internal,local CANCEL=internal,local,. 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. The syntax used in the reginfo, secinfo and prxyinfo changed over time. A rule defines. Part 6: RFC Gateway Logging. 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. We should pretend as if we would maintain the ACLs of a stand-alone RFC Gateway. 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. If this client does not match the criteria in the CANCEL list, then it is not able to cancel a registered program. For example: the system has the CI (hostname sapci) and two application instances (hostnames appsrv1 and appsrv2). Maybe some security concerns regarding the one or the other scenario raised already in you head. It might be needed to add additional servers from other systems (for an SLD program SLD_UC, SLD_NUC, for example).CANCEL is usually a list with all SAP servers from this system (or the keyword "internal"), and also the same servers as in HOSTS (as you must allow the program to de-register itself).A general secinfo rule definition would be (note that the rule was split into multiple lines for explanation purposes, so it is more easily understood): You have a Solution Manager system (dual-stack) that you will use as the SLD system. Um diese Website nutzen zu knnen, aktivieren Sie bitte JavaScript. Da das aber gewnscht ist, mssen die Zugriffskontrolllisten schrittweise um jedes bentigte Programm erweitert werden. An example could be the integration of a TAX software. In addition, the existing rules on the reginfo/secinfo file will be applied, even on Simulation Mode. Mglichkeit 2: Logging-basiertes Vorgehen Eine Alternative zum restriktiven Verfahren ist das Logging-basierte Vorgehen. 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. This means the call of a program is always waiting for an answer before it times out. ber das Dropdown-Men regeln Sie, ob und wie weit Benutzer der Gruppe, die Sie aktuell bearbeiten, selbst CMC-Registerkartenkonfigurationen an anderen Gruppen / Benutzern vornehmen knnen! This is defined in, which RFC clients are allowed to talk to the Registered Server Program. Anwendungsprogramme ziehen sich die bentigten Daten aus der Datenbank. Sie knnen anschlieend die Registerkarten auf der CMC-Startseite sehen. The wildcard * should not be used at all. To do this, in the gateway monitor (transaction SMGW) choose Goto Expert Functions External Security Reread . 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). 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 Sie nur Support Packages auswhlen knnen, die zu der von Ihnen gewhlten Softwarekomponente gehren (der Mauszeiger ndert sein Aussehen entsprechend). Additional ACLs are discussed at this WIKI page. For example: you have changed to the rule related to the SLD_UC program, allowing a new server to communicate with it (you added the new server to the ACCESS option). Die erstellten Log-Dateien knnen im Anschluss begutachtet und daraufhin die Zugriffskontrolllisten erstellt werden. What is important here is that the check is made on the basis of hosts and not at user level. Program hugo is allowed to be started on every local host and by every user. Part 3: secinfo ACL in detail. 3. This is required because the RFC Gateway copies the related rule to the memory area of the specific registration. Should a cyberattack occur, this will give the perpetrators direct access to your sensitive SAP systems. 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. For example: an SAP SLD system registering the SLD_UC and SLD_NUC programs at an ABAP system. 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')). Falls es in der Queue fehlt, kann diese nicht definiert werden. In case you dont want to use the keyword, each instance would need a specific rule. There are two different versions of the syntax for both files: Syntax version 1 does not enable programs to be explicitly forbidden from being started or registered. There is an SAP PI system that needs to communicate with the SLD. In the slides of the talk SAP Gateway to Heaven for example a scenario is outlined in which a SAProuter installed on the same server as the RFC Gateway could be utilized to proxy a connection to local. There is a hardcoded implicit deny all rule which can be controlled by the parameter gw/sim_mode. As a result many SAP systems lack for example of proper defined ACLs to prevent malicious use. Part 5: ACLs and the RFC Gateway security The local gateway where the program is registered can always cancel the program. 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). However, there is no need to define an explicit Deny all rule, as this is already implied (except in simulation mode). So lets shine a light on security. In case of TP Name this may not be applicable in some scenarios. P USER=* USER-HOST=internal,local HOST=internal,local TP=*. Hinweis: Whlen Sie ber den Button und nicht das Dropdown-Men Gewhren aus! Part 5: ACLs and the RFC Gateway security. This order is not mandatory. 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 secinfo file has rules related to the start of programs by the local SAP instance. It is configured to start the tax calculation program at the CI of the SAP system, as the tax system is installed only there. In an ideal world each program alias of the relevant Registered Server Programs would be listed in a separate rule, even for registering program aliases from one of the hosts of internal. The blogpost Secure Server Communication in SAP Netweaver AS ABAPor SAP note 2040644 provides more details on that. ABAP SAP Basis Release as from 7.40 . The RFC Gateway does not perform any additional security checks. The secinfo file has rules related to the start of programs by the local SAP instance. Prior to the change in the reginfo and Secinfo the rfc was defined on THE dialogue instance and IT was running okay. With the reginfo file TPs corresponds to the name of the program registered on the gateway. 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). Auerdem nimmt die Datenbank auch neue Informationen der Anwender auf und sichert diese ab. 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 Here, the Gateway is used for RFC/JCo connections to other systems. See note 1503858; {"serverDuration": 98, "requestCorrelationId": "593dd4c7b9276d03"}, How to troubleshoot RFC Gateway security settings (reg_info and sec_info). Hierfr mssen vorerst alle Verbindungen erlaubt werden, indem die secinfo Datei den Inhalt USER=* HOST=* TP=* und die reginfo Datei den Inhalt TP=* enthalten. A general secinfo rule definition would be (note that the rule was split into multiple lines for explanation purposes, so it is more easily understood): 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. . Now 1 RFC has started failing for program not registered. gw/acl_mode: this parameter controls the value of the default internal rules that the RFC Gateway will use, in case the reginfo/secinfo file is not maintained. It is important to mention that the Simulation Mode applies to the registration action only. Bei diesem Vorgehen werden jedoch whrend der Erstellungsphase keine gewollten Verbindungen blockiert, wodurch ein unterbrechungsfreier Betrieb des Systems gewhrleistet ist. This is defined by the letter, which servers are allowed to register which program aliases as a Registered external RFC Server. Part 4: prxyinfo ACL in detail The name of the registered program will be TAXSYS. The Solution Manager (SolMan) system has only one instance, running at the host sapsmci. Add a Comment Firstly review what is the security level enabled in the instance as per the configuration of parameter gw/reg_no_conn_info. Someone played in between on reginfo file. 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. For example: The SAP KBAs1850230and2075799might be helpful. If the called program is not an RFC enabled program (compiled with the SAP RFC library) the call will time out, but the program is still left running on the OS level! The PI system has one Central Instance (CI) running at the server sappici, and one application instance (running at the server sappiapp1). This makes sure application servers must have a trust relation in order to take part of the internal server communication. three months) is necessary to ensure the most precise data possible for the connections used. 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). RFC had issue in getting registered on DI. this parameter controls the value of the default internal rules that the Gateway will use, in case the reginfo/secinfo file is not maintained. Da das aber gewnscht ist, mssen die Zugriffskontrolllisten schrittweise um jedes bentigte Programm erweitert werden. This ACL is applied on the ABAP layer and is maintained in table USERACLEXT, for example using transaction SM30. Then the file can be immediately activated by reloading the security files. It is configured to start the tax calculation program at the CI of the SAP system, as the tax system is installed only there. Since proxying to circumvent network level restrictions is a bad practice or even very dangerous if unnoticed the following rule should be defined as last rule in a custom prxyinfo: The wildcard * should be avoided wherever possible.
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