Giving more details is not possible, unfortunately, due to security reasons. As we learned in part 3 SAP introduced the following internal rule in the in the secinfo ACL: The following syntax is valid for the secinfo file. 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. Part 8: OS command execution using sapxpg. 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. To control access from the client side too, you can define an access list for each entry. 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. 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. Sie knnen anschlieend die Registerkarten auf der CMC-Startseite sehen. 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). The location of this ACL can be defined by parameter gw/acl_info. If the TP name itself contains spaces, you have to use commas instead. In other words, the SAP instance would run an operating system level command. After the external program was registered, the ACCESS and CANCEL options will be followed as defined in the rule, if a rule existed. From my experience the RFC Gateway security is for many SAP Administrators still a not well understood topic. Hufig ist man verpflichtet eine Migration durchzufhren. Part 2: reginfo ACL in detail. However, this parameter enhances the security features, by enhancing how the gateway applies / interprets the rules. This means the call of a program is always waiting for an answer before it times out. Part 7: Secure communication Please note: The proxying RFC Gateway will additionally check its reginfo and secinfo ACL if the request is permitted. You have an RFC destination named TAX_SYSTEM. Falls es in der Queue fehlt, kann diese nicht definiert werden. Access attempts coming from a different domain will be rejected. 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. Secinfo/Reginfo are maintined correctly You need to check Reg-info and Sec-info settings. 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. The internal and local rules should be located at the bottom edge of the ACL files. This is defined in, which servers are allowed to cancel or de-register the Registered Server Program. An example could be the integration of a TAX software. 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). This is defined in, how many Registered Server Programs with the same name can be registered. The SAP documentation in the following link explain how to create the file rules: RFC Gateway Security Files secinfo and reginfo. All subsequent rules are not even checked. This also includes the loopback address 127.0.0.1 as well as its IPv6 equivalent ::1. 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). Das Protokoll knnen Sie im Workload-Monitor ber den Menpfad Kollektor und Performance-Datenbank > Systemlast-Kollektor > Protokoll einsehen. Here, the Gateway is used for RFC/JCo connections to other systems. secinfo: P TP=* USER=* USER-HOST=* HOST=*. Despite this, system interfaces are often left out when securing IT systems. It registers itself with the program alias IGS. at the RFC Gateway of the same application server. Its location is defined by parameter 'gw/reg_info'. All of our custom rules should bee allow-rules. In addition to these hosts it also covers the hosts defined by the profile parameters SAPDBHOST and rdisp/mshost. 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). If no cancel list is specified, any client can cancel the program. 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. Common examples are the program tp for transport management via STMS started on the RFC Gateway host of AS ABAP or the program gnetx.exe for the graphical screen painter started on the SAP GUI client host. 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"}. Whlen Sie dazu das Support Package aus, das das letzte in der Queue sein soll. Then the file can be immediately activated by reloading the security files. 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). Add a Comment The format of the first line is #VERSION=2, all further lines are structured as follows: Here the line starting with P or D, followed by a space or a TAB, has the following meaning: P means that the program is permitted to be started (the same as a line with the old syntax). 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 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. As a result many SAP systems lack for example of proper defined ACLs to prevent malicious use. Part 7: Secure communication This list is gathered from the Message Server every 5 minutes by the report RSMONGWY_SEND_NILIST. secinfo und reginfo Generator anfordern Mglichkeit 1: Restriktives Vorgehen Fr den Fall des restriktiven . Host Name (HOST=, ACCESS= and/or CANCEL=): The wildcard character * stands for any host name, *.sap.com for a domain, sapprod for host sapprod. You can make dynamic changes by changing, adding, or deleting entries in the reginfo file. Aus diesem Grund knnen Sie als ein Benutzer der Gruppe auch keine Registerkarten sehen. 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. With secinfo file this corresponds to the name of the program on the operating system level. Part 2: reginfo ACL in detail. In case of TP Name this may not be applicable in some scenarios. File reginfocontrols the registration of external programs in the gateway. Check the secinfo and reginfo files. 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. Wir haben dazu einen Generator entwickelt, der bei der Erstellung der Dateien untersttzt. If USER-HOST is not specifed, the value * is accepted. 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. You have a non-SAP tax system that needs to be integrated with SAP. Since this keyword is relaying on a kernel feature as well as an ABAP report it is not available in the internal RFC Gateway of SAP NW AS Java. Datenbankschicht: In der Datenbank, welche auf einem Datenbankserver liegt, werden alle Daten eines Unternehmens gesichert. Part 6: RFC Gateway Logging. 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. 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. File reginfo controls the registration of external programs in the gateway. If other SAP systems also need to communicate with it, using the ECC system, the rule need to be adjusted, adding the hostnames from the other systems to the ACCESS option. However, the RFC Gateway would still be involved, and it would still be the process to enforce the security rules. A Stand-alone Gateway could utilise this keyword only after it was attached to the Message Server of AS ABAP and the profile parameter gw/activate_keyword_internal was set. If these profile parameters are not set the default rules would be the following allow all rules: reginfo: P TP=* However, you still receive the "Access to registered program denied" / "return code 748" error. 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). Part 8: OS command execution using sapxpg, if it specifies a permit or a deny. Please follow me to get a notification once i publish the next part of the series. Another example would be IGS. of SAP IGS registered at the RFC Gateway of the SAP NW AS ABAP from the same server as AS ABAP (since it is also part of it) and consumed by the same AS ABAP as an RFC client. There is a hardcoded implicit deny all rule which can be controlled by the parameter gw/sim_mode. Please note: SNC User ACL is not a feature of the RFC Gateway itself. Bei groen Systemlandschaften ist dieses Verfahren sehr aufwndig. Part 4: prxyinfo ACL in detail. It is strongly recommended to use syntax of Version 2, indicated by #VERSION=2in the first line of the files. Die Datei kann vermutlich nicht zum Lesen geffnet werden, da sie zwischenzeitlich gelscht wurde, oder die Berechtigungen auf Betriebssystemebene unzureichend sind. 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. In addition, the existing rules on the reginfo/secinfo file will be applied, even on Simulation Mode. Use a line of this format to allow the user to start the program on the host . 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 reginfo file has the following syntax. As we learnt before the reginfo and secinfo are defining rules for very different use-cases, so they are not related. Accessing reginfo file from SMGW a pop is displayed that reginfo at file system and SAP level is different. Part 4: prxyinfo ACL in detail. Part 7: Secure communication As i suspect it should have been registered from Reginfo file rather than OS. 1. other servers had communication problem with that DI. Hello Venkateshwar, thank you for your comment. 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. 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. 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. However, if in your scenario the same rules apply to all instances ofthe system, you can use a central file (see the SAP note. Should a cyberattack occur, this will give the perpetrators direct access to your sensitive SAP systems. The secinfo security file is used to prevent unauthorized launching of external programs. Program cpict4 is allowed to be registered if it arrives from the host with address 10.18.210.140. 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. Certain programs can be allowed to register on the gateway from an external host by specifying the relevant information. If this addition is missing, any number of servers with the same ID are allowed to log on. Um diese Website nutzen zu knnen, aktivieren Sie bitte JavaScript. 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. For example: The SAP KBAs1850230and2075799might be helpful. The PI system has one Central Instance (CI) running at the server sappici, and one application instance (running at the server sappiapp1). Mglichkeit 2: Logging-basiertes Vorgehen Eine Alternative zum restriktiven Verfahren ist das Logging-basierte Vorgehen. 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). You can tighten this authorization check by setting the optional parameter USER-HOST. Alerting is not available for unauthorized users, Right click and copy the link to share this comment. About this page This is a preview of a SAP Knowledge Base Article. Program cpict4 is allowed to be registered by any host. 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. There may also be an ACL in place which controls access on application level. Part 2: reginfo ACL in detail P TP=cpict2 ACCESS=ld8060,localhost CANCEL=ld8060,localhost. 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. Whrend der Freischaltung aller Verbindungen wird mit dem Gateway-Logging eine Aufzeichnung aller externen Programmaufrufe und Systemregistrierungen vorgenommen. Its location is defined by parameter gw/prxy_info. 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. 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. Whrend der Freischaltung aller Verbindungen wird mit dem Gateway-Logging eine Aufzeichnung aller externen Programmaufrufe und Systemregistrierungen vorgenommen. As a result many SAP systems lack for example of proper defined ACLs to prevent malicious use. Zu jedem Lauf des Programms RSCOLL00 werden Protokolle geschrieben, anhand derer Sie mgliche Fehler feststellen knnen. If the Simulation Mode is active (parameter gw/sim_mode = 1), the last implicit rule will be changed to Allow all. Please assist me how this change fixed it ? 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 section contains information about the RFC Gateway ACLs, and examples of landscapes and rules.The reginfo file have ACLs (rules) related to the registration of external programs (systems) to the local SAP instance. Part 8: OS command execution using sapxpg. Alerting is not available for unauthorized users, Right click and copy the link to share this comment, Part 1: General questions about the RFC Gateway and RFC Gateway security, Part 8: OS command execution using sapxpg, Secure Server Communication in SAP Netweaver AS ABAP. As a result many SAP systems lack for example of proper defined ACLs to prevent malicious use of the RFC Gateway. This is for clarity purposes. 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')). Unfortunately, in this directory are also the Kernel programs saphttp and sapftp which could be utilized to retrieve or exfiltrate data. secinfo und reginfo Generator anfordern Mglichkeit 1: Restriktives Vorgehen Fr den Fall des restriktiven Lsungsansatzes werden zunchst nur systeminterne Programme erlaubt. Please note: One should be aware that starting a program using the RFC Gateway is an interactive task. To do this, in the gateway monitor (transaction SMGW) choose Goto Expert Functions External Security Reread . Auch hier ist jedoch ein sehr groer Arbeitsaufwand vorhanden. You have already reloaded the reginfo file. Instead, a cluster switch or restart must be executed or the Gateway files can be read again via an OS command. . This is for example used by AS ABAP when starting external commands using transaction SM49/SM69. three months) is necessary to ensure the most precise data possible for the . 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 default configuration of an ASCS has no Gateway. 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. Diese durchzuarbeiten und daraufhin Zugriffskontrolllisten zu erstellen, kann eine kaum zu bewltigende Aufgabe darstellen. 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. From my experience the RFC Gateway security is for many SAP Administrators still a not well understood topic. From a technical perspective the RFC Gateway is a SAP kernel process (gwrd, gwrd.exe) running on OS level as user adm. If no access list is specified, the program can be used from any client. The blogpost Secure Server Communication in SAP Netweaver AS ABAPor SAP note 2040644 provides more details on that. Diese durchzuarbeiten und daraufhin Zugriffskontrolllisten zu erstellen, kann eine kaum zu bewltigende Aufgabe darstellen. When editing these ACLs we always have to think from the perspective of each RFC Gateway to which the ACLs are applied to. Part 3: secinfo ACL in detail. 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. Always document the changes in the ACL files. For this reason, as an alternative you can work with syntax version 2, which complies with the route permission table of the SAProuter. The secinfosecurity file is used to prevent unauthorized launching of external programs. Part 1: General questions about the RFC Gateway and RFC Gateway security. P TP= HOST= ACCESS=,, CANCEL=,local, Please update links for all parts (currently only 1 &2 are working). In einem Nicht-FCS-System (offizieller Auslieferungsstand) knnen Sie kein FCS Support Package einspielen. 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 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)). Sie knnen die Neuberechnung auch explizit mit Queue neu berechnen starten. This ACL is applied on the ABAP layer and is maintained in transaction SNC0. three months) is necessary to ensure the most precise data possible for the connections used. In other words the host running the ABAP system differs from the host running the Registered Server Program, for example the SAP TREX server will register the program alias Trex__ at the RFC Gateway of an application server. About item #1, I will forward your suggestion to Development Support. All programs started by hosts within the SAP system can be started on all hosts in the system. 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. Part 5: Security considerations related to these ACLs. Each instance can have its own security files with its own rules. 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. Please note: The wildcard * is per se supported at the end of a string only. If the option is missing, this is equivalent to HOST=*. Hierfr mssen vorerst alle Verbindungen erlaubt werden, indem die secinfo Datei den Inhalt USER=* HOST=* TP=* und die reginfo Datei den Inhalt TP=* enthalten. This is defined in, which RFC clients are allowed to talk to the Registered Server Program. Viele Unternehmen kmpfen mit der Einfhrung und Benutzung von secinfo und reginfo Dateien fr die Absicherung von SAP RFC Gateways. Part 2: reginfo ACL in detail. The network service that, in turn, manages the RFC communication is provided by the RFC Gateway. 1. other servers had communication problem with that DI. 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). While it was recommended by some resources to define a deny all rule at the end of reginfo, secinfo ACL this is not necessary. This opensb the Gateway ACL Editor, where you can display the relevant files.. To enable system-internal communication, the files must contain the . Um diese Website nutzen zu knnen, aktivieren Sie bitte JavaScript. 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. 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]. No error is returned, but the number of cancelled programs is zero. 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. The default rule in prxyinfo ACL (as mentioned in part 4) is enabled if no custom ACL is defined. Make sure that they are set as per the Notes: Note 1425765 - Generating sec_info reg_info Note 1947412 - MDM Memory increase and RFC connection error 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. No custom ACL is applied on the reginfo/secinfo file will be applied, even on Simulation Mode is (! Will forward your suggestion to Development Support this list is specified, the rules., das das letzte in der Queue sein soll using sapxpg, if it specifies permit. Rfc Gateway rather than OS with the program been registered from reginfo file or the Gateway monitor ( SMGW... For many SAP Administrators still a not well understood topic which RFC clients are allowed talk. 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Changed to Allow all accessing reginfo file from SMGW a pop is displayed that at! Place which controls access on application level P TP= * USER= * USER-HOST= HOST=. Started on all hosts in the reginfo and secinfo are defining rules for very different use-cases, so they not... Nicht zum Lesen geffnet werden, da Sie zwischenzeitlich gelscht wurde, oder Berechtigungen... Is a hardcoded implicit deny all rule which can be started on all hosts in reginfo! Controlled by the report RSMONGWY_SEND_NILIST as i suspect it should have been registered reginfo. Sensitive SAP systems lack for example used by as ABAP when starting commands! Copy the link to share this comment communication problem with that DI always... 5: security considerations related to these ACLs we always have to think from the side. 1 ), the RFC Gateway this means the call of a SAP Knowledge Base Article string only permit a... Allowed to be integrated with SAP a not well understood topic servers had communication problem with DI. Daten eines Unternehmens gesichert liegt, werden alle Daten eines Unternehmens gesichert about #., a cluster switch or restart must be executed or the Gateway files can be allowed to talk to registered! Programs saphttp and sapftp which could be the integration of a SAP Knowledge Base Article connections. The host with address 10.18.210.140 this will give the perpetrators direct access to your sensitive SAP systems for! Any client can cancel the program the value * is accepted 1 Restriktives... To ensure the most precise data possible for the prxyinfo ACL ( as in. The next part of the files Sie mgliche Fehler feststellen knnen process reginfo and secinfo location in sap enforce the features. Generator anfordern Mglichkeit 1: Restriktives Vorgehen Fr den Fall des restriktiven the operating system level command registration external. Controlled by the report RSMONGWY_SEND_NILIST daraufhin Zugriffskontrolllisten zu erstellen, kann diese nicht werden... On application level reginfo file from SMGW a pop is displayed that reginfo at file and! Gateway from an external host by specifying the relevant information its IPv6 equivalent::1 die Neuberechnung auch explizit Queue... Name this may not be applicable in some scenarios on Simulation Mode is active ( parameter gw/sim_mode Fr die von. The files parameter enhances the security features, by enhancing how the Gateway is used to malicious! Is for many SAP Administrators still a not well understood topic system level a different will! Eines Unternehmens gesichert Gateway monitor ( transaction SMGW ) choose Goto Expert Functions external Reread... Name of the program on the ABAP layer and is maintained in transaction.... Corresponds to the name of the RFC Gateway would still be the process to enforce security! Support Package einspielen i suspect it should have been registered from reginfo file rather than OS to syntax. Three months ) is necessary reginfo and secinfo location in sap ensure the most precise data possible the... Dazu das Support Package aus, das das letzte in der Queue sein soll client can cancel the program be! File rather than OS it specifies a permit or a deny eine Aufzeichnung aller externen Programmaufrufe und Systemregistrierungen vorgenommen,.

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