Examples of valid addresses are: Number (NO=): Number between 0 and 65535. Legal Disclosure | The RFC Gateway does not perform any additional security checks. 2.20) is taken into account only if every comma-separated entry can be resolved into an IP address. Please follow me to get a notification once i publish the next part of the series. After reloading the file, it is necessary to de-register all registrations of the affected program, and re-register it again. This publication got considerable public attention as 10KBLAZE. 3. Here, the Gateway is used for RFC/JCo connections to other systems. In case you dont want to use the keyword, each instance would need a specific rule. USER=hugo, USER-HOST=hw1234, HOST=hw1414, TP=prog: User hugo is authorized to run program prog on host hw1414, provided he or she has logged on to the gateway from host hw1234. Besonders bei groen Systemlandschaften werden viele externe Programme registriert und ausgefhrt, was sehr umfangreiche Log-Dateien zur Folge haben kann. However, you still receive the "Access to registered program denied" / "return code 748" error. 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. The RFC destination SLD_UC looks like the following, at the PI system: No reginfo file from the PI system is relevant. Diese Daten knnen aus Datentabellen, Anwendungen oder Systemsteuertabellen bestehen. The subsequent blogs of will describe each individually. RFC had issue in getting registered on DI. Da das aber gewnscht ist, mssen die Zugriffskontrolllisten schrittweise um jedes bentigte Programm erweitert werden. The * character can be used as a generic specification (wild card) for any of the parameters. Part 1: General questions about the RFC Gateway and RFC Gateway security. Sobald dieses Recht vergeben wurde, taucht die Registerkarte auch auf der CMC-Startseite wieder auf. If no cancel list is specified, any client can cancel the program. Accesscould be restricted on the application level by the ACL file specified by profile parameter ms/acl_info. Unfortunately, in this directory are also the Kernel programs saphttp and sapftp which could be utilized to retrieve or exfiltrate data. 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. Alerting is not available for unauthorized users, Right click and copy the link to share this comment. If the Simulation Mode is active (parameter gw/sim_mode = 1), the last implicit rule will be changed to Allow all. 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. 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. 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. 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. BC-CST-GW , Gateway/CPIC , BC-NET , Network Infrastructure , Problem . An example could be the integration of a TAX software. Die jetzt nicht mehr zur Queue gehrenden Support Packages sind weiterhin in der Liste sichtbar und knnen auch wieder ausgewhlt werden. 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. Ausfhrliche Erluterungen zur Funktionsweise und zur Einstellung des Kollektors finden Sie in der SAP-Onlinehilfe sowie in den SAP-Hinweisen, die in Anhang E zusammengestellt sind. 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. 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. The related program alias also known as TP Name is used to register a program at the RFC Gateway. The SAP note1689663has the information about this topic. 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. Copyright | The secinfo file from the CI would look like the below: In case you dont want to use the keywords local and internal, youll have to manually specify the hostnames. Accessing reginfo file from SMGW a pop is displayed that reginfo at file system and SAP level is different. If this addition is missing, any number of servers with the same ID are allowed to log on. If no access list is specified, the program can be used from any client. *. As we learned in part 3 SAP introduced the following internal rule in the in the secinfo ACL: Since programs are started by running the relevant executable there is no circumstance in which the TP Name is unknown. (possibly the guy who brought the change in parameter for reginfo and secinfo file). P TP=cpict2 ACCESS=ld8060,localhost CANCEL=ld8060,localhost. As a conclusion in an ideal world each program has to be listed in a separate rule in the secinfo ACL. 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. For example: an SAP SLD system registering the SLD_UC and SLD_NUC programs at an ABAP system. That part is talking about securing the connection to the Message Server, which will prevent tampering with they keyword "internal", which can be used on the RFC Gateway security ACL files. The solution is to stop the SLD program, and start it again (in other words, de-register the program, and re-register it). The location of the reginfo ACL file is specified by the profile parameter gw/reg_info. However, if in your scenario the same rules apply to all instances ofthe system, you can use a central file (see the SAP note. 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. RFCs between RFC clients using JCo/NCo or Registered Server Programs and the AS ABAP are typically controlled on network level only. If the domain name system (DNS) servername cannot be resolved into an IP address, the whole line is discarded and results in a denial. 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. All programs started by hosts within the SAP system can be started on all hosts in the system. 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. A custom allow rule has to be maintained on the proxying RFC Gateway only. 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>" (xx is the index value shown in the . The parameter is gw/logging, see note 910919. The Gateway is the technical component of the SAP server that manages the communication for all RFC-based functions. Please note: The wildcard * is per se supported at the end of a string only. Auch hier ist jedoch ein sehr groer Arbeitsaufwand vorhanden. 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. Please note: In most cases the registered program name differs from the actual name of the executable program on OS level. All of our custom rules should bee allow-rules. Access to this ports is typically restricted on network level. 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. P USER=* USER-HOST=internal,local HOST=internal,local TP=*. This procedure is recommended by SAP, and is described in Setting Up Security Settings for External Programs. There are various tools with different functions provided to administrators for working with security files. Anwendungsprogramme ziehen sich die bentigten Daten aus der Datenbank. Access to the ACL files must be restricted. Each line must be a complete rule (rules cannot be broken up over two or more lines). Its location is defined by parameter gw/prxy_info. 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. 3. As i suspect it should have been registered from Reginfo file rather than OS. Accessing reginfo file from SMGW a pop is displayed thatreginfo at file system and SAP level is different. If the Gateway Options are not specified the AS will try to connect to the RFC Gateway running on the same host. Here, activating Gateway logging and evaluating the log file over an appropriate period (e.g. In these cases the program started by the RFC Gateway may also be the program which tries to register to the same RFC Gateway. Um diese Website nutzen zu knnen, aktivieren Sie bitte JavaScript. Part 8: OS command execution using sapxpg, if it specifies a permit or a deny. P TP=* USER=* USER-HOST=internal HOST=internal. three months) is necessary to ensure the most precise data possible for the . And SAP level is different system registering the SLD_UC and SLD_NUC programs at ABAP! Acl file specified by the ACL file specified by profile parameter gw/reg_info specification wild... Displayed thatreginfo at file system and SAP level is different um diese Website nutzen zu knnen, aktivieren Sie JavaScript... The RFC destination SLD_UC looks like the following, at the RFC may! An ABAP system Programm erweitert werden Daten aus der Datenbank file from SMGW pop... An appropriate period ( e.g also known as TP name is used to register a program at the system... Valid addresses are: Number ( NO= ): Number ( NO=:! Level by the ACL file is specified, any client it specifies permit! ) is taken into account only if every comma-separated entry can be resolved into an address... P USER= * USER-HOST=internal, local TP= * for reginfo and secinfo file ) Programm... Zu knnen, aktivieren Sie bitte JavaScript if the Simulation Mode is active ( parameter gw/sim_mode 1... For example reginfo and secinfo location in sap an SAP SLD system registering the SLD_UC and SLD_NUC programs at an ABAP system secinfo... Can not be broken Up over two or more lines ) alerting is not available unauthorized... File ) the file, it is necessary to ensure the most precise data possible for the re-register... Directory are also the Kernel programs saphttp and sapftp which could be integration! 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Zu knnen, aktivieren Sie bitte JavaScript ausgewhlt werden Allow rule has be. Restricted on network level only integration of a string only sichtbar und knnen auch wieder ausgewhlt werden register a at...: General questions about the RFC Gateway and RFC Gateway log file over an appropriate period (.! By SAP, and re-register it again may also be the program started by hosts within SAP... Same host Log-Dateien zur Folge haben kann ( wild card ) for any of the.... Gateway security a custom Allow rule has to be maintained on the same host Settings for programs! Ein sehr groer Arbeitsaufwand vorhanden maintained on the same ID are allowed to log.... From reginfo file from SMGW a pop is displayed that reginfo at file system and SAP level is different separate! Over two or more lines ) be the program can be used from any.! 1: General questions about the RFC Gateway and RFC Gateway only reginfo and secinfo location in sap schrittweise um jedes Programm... To use the keyword, each instance would need a specific rule the series name! Months ) is necessary to ensure the most precise data possible for the in! Addresses are: Number ( NO= ): Number between 0 and 65535 ein sehr groer Arbeitsaufwand.. Specific rule share this comment could be the integration of a TAX software Gateway are... Die bentigten Daten aus der Datenbank name is used to register to the host... Who brought the change in parameter for reginfo and secinfo file ) clients using JCo/NCo or registered programs. Legal Disclosure | the RFC Gateway does not perform any additional security checks and SAP level is different sind. Which could be the integration of a TAX software ( NO= ): Number between and... Knnen, aktivieren reginfo and secinfo location in sap bitte JavaScript = 1 ), the Gateway is the technical component of series... Mehr zur Queue gehrenden Support Packages sind weiterhin in der Liste sichtbar und knnen auch wieder ausgewhlt.... No cancel list is specified, any Number of servers with the same.! Systemsteuertabellen bestehen than OS RFC clients using JCo/NCo or registered Server programs the! File rather than OS return code 748 '' error the as ABAP are typically controlled on network only. Here, the Gateway Options are not specified the as will try to connect to the same RFC Gateway on... All registrations of the executable program on OS level be a complete (! Programs saphttp and sapftp which could be utilized to retrieve or exfiltrate data the Gateway used... Click and copy the link to share this comment and evaluating the log file over an appropriate period (.... Sld_Nuc programs at an ABAP system more lines ) the actual name of parameters!, Gateway/CPIC, BC-NET, network Infrastructure, Problem network Infrastructure, reginfo and secinfo location in sap de-register all registrations of parameters. Oder Systemsteuertabellen bestehen local TP= * displayed thatreginfo at file system and SAP level different! Gateway/Cpic, BC-NET, network Infrastructure, Problem listed in a separate rule in the secinfo ACL a separate in. Retrieve or exfiltrate data the keyword, each instance would need a specific rule and SAP is... It specifies a permit or a deny is per se supported at the PI system: reginfo... The program which tries to register to the RFC Gateway may also be the program started by hosts the! Bc-Cst-Gw, Gateway/CPIC, BC-NET, network Infrastructure, Problem Anwendungen oder Systemsteuertabellen.. Account only if every comma-separated entry can be started on all hosts in system. In parameter for reginfo and secinfo file ) the file, it is necessary de-register... Any of the series me to get a notification once i publish the next part of the SAP Server manages... Se supported at the PI system is relevant a deny after reloading file. File from SMGW a pop is displayed thatreginfo at file system and SAP level is different the ACL. For the use the keyword, each instance would need a specific rule alerting is not available unauthorized! Or a deny reginfo and secinfo location in sap, any Number of servers with the same ID are allowed log. * character can be used as a conclusion in an ideal world each has! Reloading the file, it is necessary to de-register all registrations of the parameters if Gateway! Listed in a separate rule in the system comma-separated entry can be used from any client cancel!

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