reginfo and secinfo location in sapreginfo and secinfo location in sap

While it was recommended by some resources to define a deny all rule at the end of reginfo, secinfo ACL this is not necessary. 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: SAP introduced an internal rule in the reginfo ACL to cover these cases: P TP=* HOST=internal,local ACCESS=internal,local CANCEL=internal,local. 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. Somit knnen keine externe Programme genutzt werden. 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). An example would be Trex__ registered at the RFC Gateway of the SAP NW AS ABAP from the server running SAP TREX and consumed by the same AS ABAP as an RFC client. There are various tools with different functions provided to administrators for working with security files. Please follow me to get a notification once i publish the next part of the series. The local gateway where the program is registered always has access. 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. Copyright | In these cases the program alias is generated with a random string. Observation: in emergency situations, follow these steps in order to disable the RFC Gateway security. There is a hardcoded implicit deny all rule which can be controlled by the parameter gw/sim_mode. The individual options can have the following values: TP Name (TP=): Maximum 64 characters, blank spaces not allowed. If the option is missing, this is equivalent to HOST=*. Es gibt verschiedene Grnde wie zB die Gesetzliche Anforderungen oder Vorbereitungsmanahmen fr eine S/HANA Conversion. Bei groen Systemlandschaften ist dieses Verfahren sehr aufwndig. Part 8: OS command execution using sapxpg. This is defined in, which servers are allowed to cancel or de-register the Registered Server Program. I think you have a typo. 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. 3. ABAP SAP Basis Release as from 7.40 . USER=mueller, HOST=hw1414, TP=test: The user mueller can execute the test program on the host hw1414. Durch einen Doppelklick auf eine Zeile erhalten Sie detaillierte Informationen ber die Task- Typen auf den einzelnen Rechnern. In other words, the SAP instance would run an operating system level command. All other programs starting with cpict4 are allowed to be started (on every host and by every user). You can tighten this authorization check by setting the optional parameter USER-HOST. We can identify these use cases by going to transaction SMGW -> Goto -> Logged on Clients and looking for lines with System Type = Registered Server and Gateway Host = 127.0.0.1 (in some cases this may be any other IP address or hostname of any application server of the same system). Program cpict2 is allowed to be registered, but can only be run and stopped on the local host or hostld8060. To do this, in the gateway monitor (transaction SMGW) choose Goto Expert Functions External Security Maintenance of ACL Files .. open transaction SMGW -> Goto -> expert functions -> Display secinfo/reginfo Green means OK, yellow warning, red incorrect. 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. Besonders bei groen Systemlandschaften werden viele externe Programme registriert und ausgefhrt, was sehr umfangreiche Log-Dateien zur Folge haben kann. 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. Please note: The proxying RFC Gateway will additionally check its reginfo and secinfo ACL if the request is permitted. This is defined by the letter, which servers are allowed to register which program aliases as a Registered external RFC Server. For example: The SAP KBAs1850230and2075799might be helpful. Auch hier ist jedoch ein sehr groer Arbeitsaufwand vorhanden. 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. The wildcard * should not be used at all. You have already reloaded the reginfo file. 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). This list is gathered from the Message Server every 5 minutes by the report RSMONGWY_SEND_NILIST. Visit SAP Support Portal's SAP Notes and KBA Search. Somit knnen keine externe Programme genutzt werden. We should pretend as if we would maintain the ACLs of a stand-alone RFC Gateway. TP is restricted to 64 non-Unicode characters for both secinfo and reginfo files. 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. Terms of use | 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. 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. The simulation mode is a feature which could help to initially create the ACLs. 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. Part 5: ACLs and the RFC Gateway security. Programs within the system are allowed to register. To control the cancellation of registered programs, a cancel list can be defined for each entry (same as for the ACCESS list). Once you have completed the change, you can reload the files without having to restart the 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. The name of the registered program will be TAXSYS. 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. 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. See note 1503858; {"serverDuration": 98, "requestCorrelationId": "593dd4c7b9276d03"}, How to troubleshoot RFC Gateway security settings (reg_info and sec_info). The default configuration of an ASCS has no Gateway. In case you dont want to use the keyword, each instance would need a specific rule. Die jetzt nicht mehr zur Queue gehrenden Support Packages sind weiterhin in der Liste sichtbar und knnen auch wieder ausgewhlt werden. 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. Diese durchzuarbeiten und daraufhin Zugriffskontrolllisten zu erstellen, kann eine kaum zu bewltigende Aufgabe darstellen. RFC had issue in getting registered on DI. Part 7: Secure communication 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. However, the RFC Gateway would still be involved, and it would still be the process to enforce the security rules. 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). 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. As i suspect it should have been registered from Reginfo file rather than OS. Besttigen Sie den auftauchenden Hinweis und vergeben Sie fr die gewnschten Gruppen zumindest das folgende Recht: Allgemein --> Allgemein --> Objekte Anzeigen. 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. Every line corresponds one rule. Hierfr mssen vorerst alle Verbindungen erlaubt werden, indem die secinfo Datei den Inhalt USER=* HOST=* TP=* und die reginfo Datei den Inhalt TP=* enthalten. 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. 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. However, you still receive the "Access to registered program denied" / "return code 748" error. However, if in your scenario the same rules apply to all instances ofthe system, you can use a central file (see the SAP note. This ACL is applied on the ABAP layer and is maintained in table USERACLEXT, for example using transaction SM30. As we learned in part 3 SAP introduced the following internal rule in the in the secinfo ACL: In the previous parts we had a look at the different ACLs and the scenarios in which they are applied. Most of the cases this is the troublemaker (!) From my experience the RFC Gateway security is for many SAP Administrators still a not well understood topic. 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. All subsequent rules are not checked at all. Someone played in between on reginfo file. 1. other servers had communication problem with that DI. Part 8: OS command execution using sapxpg. If the TP name itself contains spaces, you have to use commas instead. Part 5: ACLs and the RFC Gateway security From my experience the RFC Gateway security is for many SAP Administrators still a not well understood topic. In ABAP systems, every instance contains a Gateway that is launched and monitored by the ABAP Dispatcher. 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. Secinfo/Reginfo are maintined correctly You need to check Reg-info and Sec-info settings. Part 5: ACLs and the RFC Gateway security. For example: an SAP SLD system registering the SLD_UC and SLD_NUC programs at an ABAP system. About this page This is a preview of a SAP Knowledge Base Article. Access attempts coming from a different domain will be rejected. Um diese Website nutzen zu knnen, aktivieren Sie bitte JavaScript. The RFC Gateway is capable to start programs on the OS level. Remember the AS ABAP or AS Java is just another RFC client to the RFC Gateway. 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. The internal value for the host options (HOST and USER HOST) applies to all hosts in the SAP system. 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. Part 2: reginfo ACL in detail Configuring Connections between SAP Gateway and External Programs Securely, SAP Gateway Security Files secinfo and reginfo, Setting Up Security Settings for External Programs. 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. Wir haben dazu einen Generator entwickelt, der bei der Erstellung der Dateien untersttzt. Use host names instead of the IP address. Program cpict4 is allowed to be registered by any host. It is configured to start the tax calculation program at the CI of the SAP system, as the tax system is installed only there. As we learnt before the reginfo and secinfo are defining rules for very different use-cases, so they are not related. Die erstellten Log-Dateien knnen im Anschluss begutachtet und daraufhin die Zugriffskontrolllisten erstellt werden. 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 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. Each line must be a complete rule (rules cannot be broken up over two or more lines). Hint: Besides the syntax check, it also provides a feature supporting rule creation by predicting rules out of an automated gateway log analysis. E.g "RegInfo" file entry, P TP=BIPREC* USER=* HOST=* NO=1 CANCEL=* ACCESS=* Privacy | This publication got considerable public attention as 10KBLAZE. Part 3: secinfo ACL in detail Please note: In most cases the registered program name differs from the actual name of the executable program on OS level. We solved it by defining the RFC on MS. File reginfocontrols the registration of external programs in the gateway. This is for example used by AS ABAP when starting external commands using transaction SM49/SM69. The rules would be: Another example: lets say that the tax system is installed / available on all servers from this SAP system, the RFC destination is set to Start on application server, and the Gateway options are blank. After implementing this note, modify the Gateway security files "reg_info" and "sec_info" with TP=BIPREC* (Refer notes 614971 and 1069911). Part 2: reginfo ACL in detail. If USER-HOST is not specifed, the value * is accepted. Prior to the change in the reginfo and Secinfo the rfc was defined on THE dialogue instance and IT was running okay. The RFC destination SLD_UC looks like the following, at the PI system: No reginfo file from the PI system is relevant. 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. You have an RFC destination named TAX_SYSTEM. Limiting access to this port would be one mitigation. Da das aber gewnscht ist, mssen die Zugriffskontrolllisten schrittweise um jedes bentigte Programm erweitert werden. 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). This means the call of a program is always waiting for an answer before it times out. P means that the program is permitted to be registered (the same as a line with the old syntax). Hufig ist man verpflichtet eine Migration durchzufhren. It also enables communication between work or server processes of SAP NetWeaver AS and external programs. Unfortunately, in this directory are also the Kernel programs saphttp and sapftp which could be utilized to retrieve or exfiltrate data. 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. For this reason, as an alternative you can work with syntax version 2, which complies with the route permission table of the SAProuter. Every attribute should be maintained as specific as possible. In the following i will do the question and answer game to develop a basic understanding of the RFC Gateway, the RFC Gateway security and its related terms. As separators you can use commas or spaces. There are two different syntax versions that you can use (not together). Please assist me how this change fixed it ? 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. Program cpict4 is allowed to be registered if it arrives from the host with address 10.18.210.140. 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. 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. 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. 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. File reginfocontrols the registration of external programs in the gateway. Hierfr mssen vorerst alle Verbindungen erlaubt werden, indem die secinfo Datei den Inhalt USER=* HOST=* TP=* und die reginfo Datei den Inhalt TP=* enthalten. 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. Save ACL files and restart the system to activate the parameters. So lets shine a light on security. The network service that, in turn, manages the RFC communication is provided by the RFC Gateway. Besonders bei groen Systemlandschaften werden viele externe Programme registriert und ausgefhrt, was sehr umfangreiche Log-Dateien zur Folge haben kann. this parameter controls the value of the default internal rules that the Gateway will use, in case the reginfo/secinfo file is not maintained. In these cases the program started by the RFC Gateway may also be the program which tries to register to the same RFC Gateway. 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. DIE SAP-BASIS ALS CHANCE BEGREIFEN NAHEZU JEDE INNOVATION IM UNTERNEHMEN HAT EINEN TECHNISCHEN FUSSABDRUCK IM BACKEND, DAS MEISTENS EIN SAP-SYSTEM ABBILDET. For example: an SAP SLD system registering the SLD_UC and SLD_NUC programs at an ABAP system. To do this, in the gateway monitor (transaction SMGW) choose Goto Expert Functions External Security Reread . It seems to me that the parameter is gw/acl_file instead of ms/acl_file. P USER=* USER-HOST=internal,local HOST=internal,local TP=*. Please note: SNC System ACL is not a feature of the RFC Gateway itself. Part 7: Secure communication Then the file can be immediately activated by reloading the security files. 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). 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. Only clients from domain *.sap.com are allowed to communicate with this registered program (and the local application server too). This is required because the RFC Gateway copies the related rule to the memory area of the specific registration. 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). The RFC Gateway act as an RFC Server which enables RFC function modules to be used by RFC clients. Furthermore the means of some syntax and security checks have been changed or even fixed over time. Auch hier ist jedoch ein sehr groer Arbeitsaufwand vorhanden. 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. Obviously, if the server is unavailable, an error message appears, which might be better only just a warning, some entries in reginfo and logfile dev_rd shows (if the server is noch reachable), NiHLGetNodeAddr: to get 'NBDxxx' failed in 5006ms (tl=2000ms; MT; UC)*** ERROR => NiHLGetNodeAddr: NiPGetHostByName failed (rc=-1) [nixxhl.cpp 284]*** ERROR => HOST=NBDxxx invalid argument in line 9 (NIEHOST_UNKNOWN) [gwxxreg.c 2897]. 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. 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. 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. Die Datei kann vermutlich nicht zum Lesen geffnet werden, da sie zwischenzeitlich gelscht wurde, oder die Berechtigungen auf Betriebssystemebene unzureichend sind.

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