Evaluate the Gateway log files and create ACL rules. To display the security files, use the gateway monitor in AS ABAP (transaction SMGW). 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. Program foo is only allowed to be used by hosts from domain *.sap.com. 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. However, if in your scenario the same rules apply to all instances ofthe system, you can use a central file (see the SAP note. Part 5: ACLs and the RFC Gateway security Remember the AS ABAP or AS Java is just another RFC client to the RFC Gateway. See note 1503858; {"serverDuration": 98, "requestCorrelationId": "593dd4c7b9276d03"}, How to troubleshoot RFC Gateway security settings (reg_info and sec_info). Every line corresponds one rule. Part 3: secinfo ACL in detail Always document the changes in the ACL files. 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 8: OS command execution using sapxpg. Please note: The wildcard * is per se supported at the end of a string only. This means the call of a program is always waiting for an answer before it times out. The wildcard * should not be used at all. The reginfo rule from the ECCs CI would be: The rule above allows any instance from the ECC system to communicate with the tax system. 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). 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 case the files are maintained, the value of this parameter is irrelevant; gw/sim_mode: activates/deactivates the simulation mode (see the previous section of this WIKI page). Example Example 1: 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. RFCs between RFC clients using JCo/NCo or Registered Server Programs and the AS ABAP are typically controlled on network level only. For example: the system has the CI (hostname sapci) and two application instances (hostnames appsrv1 and appsrv2). 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. 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 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). As i suspect it should have been registered from Reginfo file rather than OS. 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. In einer Dialogbox knnen Sie nun definieren, welche Aktionen aufgezeichnet werden sollen. Part 5: Security considerations related to these ACLs. 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 location of this ACL can be defined by parameter gw/acl_info. Unfortunately, in this directory are also the Kernel programs saphttp and sapftp which could be utilized to retrieve or exfiltrate data. 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). File reginfocontrols the registration of external programs in the gateway. Alerting is not available for unauthorized users, Right click and copy the link to share this comment. Part 8: OS command execution using sapxpg. 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. For example: an SAP SLD system registering the SLD_UC and SLD_NUC programs at an ABAP system. 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. There aretwo parameters that control the behavior of the RFC Gateway with regards to the security rules. You must keep precisely to the syntax of the files, which is described below. Read more. As we learned in part 3 SAP introduced the following internal rule in the in the secinfo ACL: Despite this, system interfaces are often left out when securing IT systems. The gateway replaces this internally with the list of all application servers in the SAP system. The internal value for the host options (HOST and USER HOST) applies to all hosts in the SAP system. Configuring Connections between SAP Gateway and External Programs Securely, SAP Gateway Security Files secinfo and reginfo, Setting Up Security Settings for 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. 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 . Bei diesem Vorgehen werden jedoch whrend der Erstellungsphase keine gewollten Verbindungen blockiert, wodurch ein unterbrechungsfreier Betrieb des Systems gewhrleistet ist. Part 8: OS command execution using sapxpg. Besonders bei groen Systemlandschaften werden viele externe Programme registriert und ausgefhrt, was sehr umfangreiche Log-Dateien zur Folge haben kann. The Solution Manager (SolMan) system has only one instance, running at the host sapsmci. In case of TP Name this may not be applicable in some scenarios. Again when a remote server of a Registered Server Program is going to be shutdown due to maintenance it may de-register its program from the RFC Gateway to avoid errors. They also have a video (the same video on both KBAs) illustrating how the reginfo rules work. It is important to mention that the Simulation Mode applies to the registration action only. Access to this ports is typically restricted on network level. 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. 1408081 - Basic settings for reg_info and sec_info 1702229 - Precalculation: Specify Program ID in sec_info and reg_info. To overcome this issue the RFC enabled program SAPXPG can be used as a wrapper to call any OS command. Accessing reginfo file from SMGW a pop is displayed that reginfo at file system and SAP level is different. If USER-HOST is not specifed, the value * is accepted. To control access from the client side too, you can define an access list for each entry. 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. Accessing reginfo file from SMGW a pop is displayed thatreginfo at file system and SAP level is different. Wir haben dazu einen Generator entwickelt, der bei der Erstellung der Dateien untersttzt. The local gateway where the program is registered can always cancel the program. It is common to define this rule also in a custom reginfo file as the last rule. 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! Please follow me to get a notification once i publish the next part of the series. The RFC destination would look like: It could not have been more complicated -obviously the sequence of lines is important): gw/reg_no_conn_info, all other sec-checks can be disabled =>, {"serverDuration": 153, "requestCorrelationId": "397367366a414325"}. With secinfo file this corresponds to the name of the program on the operating system level. Please pay special attention to this phase! Limiting access to this port would be one mitigation. Part 6: RFC Gateway Logging. Somit knnen keine externe Programme genutzt werden. There may also be an ACL in place which controls access on application level. The RFC Gateway act as an RFC Server which enables RFC function modules to be used by RFC clients. The secinfo file has rules related to the start of programs by the local SAP instance. This is defined by the letter, which servers are allowed to register which program aliases as a Registered external RFC Server. Terms of use | At time of writing this can not be influenced by any profile parameter. There are other SAP notes that help to understand the syntax (refer to the Related notes section below). On SAP NetWeaver AS ABAP registering Registered Server Programs byremote servers may be used to integrate 3rd party technologies. In SAP NetWeaver Application Server Java: The SCS instance has a built-in RFC Gateway. 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. 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. 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). Diese durchzuarbeiten und daraufhin Zugriffskontrolllisten zu erstellen, kann eine kaum zu bewltigende Aufgabe darstellen. The Gateway is the technical component of the SAP server that manages the communication for all RFC-based functions. Benign programs to be started by the local RFC Gateway of a SAP NetWeaver AS ABAP are typically part of the SAP Kernel and located in the $(DIR_EXE) of the application server. This ACL is applied on the ABAP layer and is maintained in transaction SNC0. 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. It is common and recommended by many resources to define the following rule in a custom prxyinfo ACL: With this, all requests from the local system, as well as all application servers of the same system, will be proxied by the RFC Gateway to any destination or end point. The reginfo file has the following syntax. To do this, in the gateway monitor (transaction SMGW) choose Goto Expert Functions External Security Reread . It is common to define this rule also in a custom reginfo file as the last rule. However, you still receive the "Access to registered program denied" / "return code 748" error. E.g "RegInfo" file entry, P TP=BIPREC* USER=* HOST=* NO=1 CANCEL=* ACCESS=* As such, it is an attractive target for hacker attacks and should receive corresponding protections. Part 3: secinfo ACL in detail. 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. While it is common and recommended by many resources to define this rule in a custom secinfo ACL as the last rule, from a security perspective it is not an optimal approach. 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). The RFC Gateway can be used to proxy requests to other RFC Gateways. RFC had issue in getting registered on DI. The default value is: When the gateway is started, it rereads both security files. The * character can be used as a generic specification (wild card) for any of the parameters. Die jetzt nicht mehr zur Queue gehrenden Support Packages sind weiterhin in der Liste sichtbar und knnen auch wieder ausgewhlt werden. Secinfo/Reginfo are maintined correctly You need to check Reg-info and Sec-info settings. BC-CST-GW , Gateway/CPIC , BC-NET , Network Infrastructure , Problem . To use all capabilities it is necessary to set the profile parameter gw/reg_no_conn_info = 255. This rule is generated when gw/acl_mode = 1 is set but no custom reginfo was defined. three months) is necessary to ensure the most precise data possible for the connections used. secinfo und reginfo Generator anfordern Mglichkeit 1: Restriktives Vorgehen Fr den Fall des restriktiven . File reginfocontrols the registration of external programs in the gateway. For this scenario a custom rule in the reginfo ACL would be necessary, e.g., P TP= HOST= ACCESS=internal,local CANCEL=internal,local,. If the TP name has been specified without wild cards, you can specify the number of registrations allowed here. All programs started by hosts within the SAP system can be started on all hosts in the system. Each instance can have its own security files with its own rules. 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. This is a list of host names that must comply with the rules above. 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. 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. If the TP name itself contains spaces, you have to use commas instead. The related program alias can be found in column TP: We can identify RFC clients which consume these Registered Server Programs by corresponding entries in the gateway log. Ergebnis Sie haben eine Queue definiert. Auerdem nimmt die Datenbank auch neue Informationen der Anwender auf und sichert diese ab. Another example: you have a non-SAP tax system that will register a program at the CI of an SAP ECC system. 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. Since programs are started by running the relevant executable there is no circumstance in which the TP Name is unknown. Further information about this parameter is also available in the following link: RFC Gateway security settings - extra information regarding SAP note 1444282. No error is returned, but the number of cancelled programs is zero. 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 Datenbankschicht: In der Datenbank, welche auf einem Datenbankserver liegt, werden alle Daten eines Unternehmens gesichert. This publication got considerable public attention as 10KBLAZE. Diese durchzuarbeiten und daraufhin Zugriffskontrolllisten zu erstellen, kann eine kaum zu bewltigende Aufgabe darstellen. The related program alias also known as TP Name is used to register a program at the RFC Gateway. Regeln fr die Queue Die folgenden Regeln gelten fr die Erstellung einer Queue: Wenn es sich um ein FCS-System handelt, dann steht an erster Stelle ein FCS Support Package. 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. Program cpict4 is not permitted to be started. This page contains information about the RFC Gateway ACLs (reginfo and secinfo files), the Simulation Mode, as well as the workflow showing how the RFC Gateway works with regards to the ACLs versus the Simulation Mode. In other words, the SAP instance would run an operating system level command. You have already reloaded the reginfo 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. Additional ACLs are discussed at this WIKI page. This would cause "odd behaviors" with regards to the particular RFC destination. 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. Das Protokoll knnen Sie im Workload-Monitor ber den Menpfad Kollektor und Performance-Datenbank > Systemlast-Kollektor > Protokoll einsehen. What is important here is that the check is made on the basis of hosts and not at user level. 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). 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. 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')). This is for example used by AS ABAP when starting external commands using transaction SM49/SM69. SMGW-->Goto -->External Functions --> External Security --> Maintenance of ACL files --> pop-up is shown as below: "Gateway content and file content for reginfo do not match starting with index " (xx is the index value shown in the pop-up), Gateway, Security, length, line, rule, limit, abap , KBA , BC-CST-GW , Gateway/CPIC , Problem. We first registered it on the server it is defined (which was getting de-registered after a while so we registered it again through background command nohup *** & ), This solved the RFC communication on that Dialogue instance yet other Dialogue instances were not able to communicate on the RFC. 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. 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. 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). The first letter of the rule can be either P (for Permit) or D (for Deny). A combination of these mitigations should be considered in general. The RFC Gateway hands over the request from the RFC client to the dispatcher which assigns it to a work process (AS ABAP) or to a server process (AS Java). The simulation mode is a feature which could help to initially create the ACLs. There are various tools with different functions provided to administrators for working with security files. To set up the recommended secure SAP Gateway configuration, proceed as follows:. Access to the ACL files must be restricted. Checking the Security Configuration of SAP Gateway. IP Addresses (HOST=, ACCESS= and/or CANCEL=): You can use IP addresses instead of host names. As we learned in part 4 SAP introduced the following internal rule in the in the prxyinfo ACL: The default rule in prxyinfo ACL (as mentioned in part 4) is enabled if no custom ACL is defined. Part 4: prxyinfo ACL in detail. Please note: SNC User ACL is not a feature of the RFC Gateway itself. Prior to the change in the reginfo and Secinfo the rfc was defined on THE dialogue instance and IT was running okay. If these profile parameters are not set the default rules would be the following allow all rules: reginfo: P TP=* Only clients from domain *.sap.com are allowed to communicate with this registered program (and the local application server too). We solved it by defining the RFC on MS. We made a change in the location of Reginfo and Secinfo file location we moved it to SYS directory and updated the profile parameter accordingly (instance profile). 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. The SAP documentation in the following link explain how to create the file rules: RFC Gateway Security Files secinfo and reginfo. Part 2: reginfo ACL in detail. Part 7: Secure communication Um diese Website nutzen zu knnen, aktivieren Sie bitte JavaScript. 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. Hufig ist man verpflichtet eine Migration durchzufhren. Auch hier ist jedoch ein sehr groer Arbeitsaufwand vorhanden. This is required because the RFC Gateway copies the related rule to the memory area of the specific registration. 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. 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 following syntax is valid for the secinfo file. Besonders bei groen Systemlandschaften werden viele externe Programme registriert und ausgefhrt, was sehr umfangreiche Log-Dateien zur Folge haben kann. 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. To set up the recommended secure SAP Gateway configuration, proceed as follows: the end of string... Behaviors '' with regards to the memory area of the series local SAP instance run... To control access from the client side too, you can use Addresses! Should not be applicable in some scenarios and it was running okay list for entry... Ist jedoch ein sehr groer Arbeitsaufwand vorhanden security rules what is important here is that the check made! Settings - extra information regarding SAP note 1444282 Erstellung der Dateien untersttzt enables RFC function modules to be used a. 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I suspect it should have been Registered from reginfo file as the last implicit will... Abap system der Liste sichtbar und knnen auch wieder ausgewhlt werden string only anfordern Mglichkeit 1: Restriktives Vorgehen den. Part reginfo and secinfo location in sap: secinfo ACL in detail always document the changes in the SAP in... Any OS command saphttp and sapftp which could be utilized to retrieve exfiltrate! To integrate 3rd party technologies also in a custom reginfo was defined RFC-based... All hosts in the system the link to share this comment Registered external RFC Server SolMan ) system has CI... Dazu einen Generator entwickelt, der bei der Erstellung der Dateien untersttzt which could to! Internal value for the connections used some scenarios Registered external RFC Server is... Means the call of a program at the host sapsmci of these mitigations should be considered in general ( and! Sapxpg can be either P ( for Permit ) or D ( for )!