Hufig ist man verpflichtet eine Migration durchzufhren. Part 3: secinfo ACL in detail. Then the file can be immediately activated by reloading the security files. 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. TP is restricted to 64 non-Unicode characters for both secinfo and reginfo files. For example: an SAP SLD system registering the SLD_UC and SLD_NUC programs at an ABAP system. 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. Programs within the system are allowed to register. Please assist me how this change fixed it ? If USER-HOST is not specifed, the value * is accepted. Das Protokoll knnen Sie im Workload-Monitor ber den Menpfad Kollektor und Performance-Datenbank > Systemlast-Kollektor > Protokoll einsehen. The first letter of the rule can begin with either P (permit) or D (deny). 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. 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. 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. 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. Please note: In most cases the registered program name differs from the actual name of the executable program on OS level. You have a non-SAP tax system that needs to be integrated with SAP. Part 8: OS command execution using sapxpg. This means that the sequence of the rules is very important, especially when using general definitions. 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. On SAP NetWeaver AS ABAP registering Registered Server Programs byremote servers may be used to integrate 3rd party technologies. Ergebnis Sie haben eine Queue definiert. To control the cancellation of registered programs, a cancel list can be defined for each entry (same as for the ACCESS list). 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. Part 7: Secure communication Part 7: Secure communication It also enables communication between work or server processes of SAP NetWeaver AS and external programs. 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. Fr die gewnschten Registerkarten "Gewhren" auswhlen. 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. 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. It is configured to start the tax calculation program at the CI of the SAP system, as the tax system is installed only there. 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]. 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). Da das aber gewnscht ist, mssen die Zugriffskontrolllisten schrittweise um jedes bentigte Programm erweitert werden. Auerdem nimmt die Datenbank auch neue Informationen der Anwender auf und sichert diese ab. It is important to mention that the Simulation Mode applies to the registration action only. 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). There may also be an ACL in place which controls access on application level. 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. If these profile parameters are not set the default rules would be the following allow all rules: reginfo: P TP=* 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). 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. 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). Check out our SAST SOLUTIONS website or send us an e-mail us at [email protected]. From a technical perspective the RFC Gateway is a SAP kernel process (gwrd, gwrd.exe) running on OS level as user adm. All of our custom rules should bee allow-rules. You have an RFC destination named TAX_SYSTEM. The blogpost Secure Server Communication in SAP Netweaver AS ABAPor SAP note 2040644 provides more details on that. Help with the understanding of the RFC Gateway ACLs (Access Control Lists) and the Simulation Mode, in order to help prepare production systems to have these security features enabled without disruptions. In case you dont want to use the keyword, each instance would need a specific rule. However, this parameter enhances the security features, by enhancing how the gateway applies / interprets the rules. This could be defined in. Save ACL files and restart the system to activate the parameters. Individuelle Entwicklungen nimmt gerne unser SAP Development Team vor. This makes sure application servers must have a trust relation in order to take part of the internal server communication. The default rule in prxyinfo ACL (as mentioned in part 4) is enabled if no custom ACL is defined. In addition to these hosts it also covers the hosts defined by the profile parameters SAPDBHOST and rdisp/mshost. Part 2: reginfo ACL in detail Here, activating Gateway logging and evaluating the log file over an appropriate period (e.g. 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. 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. Use a line of this format to allow the user to start the program on the host . Sie knnen anschlieend die Registerkarten auf der CMC-Startseite sehen. Unfortunately, in this directory are also the Kernel programs saphttp and sapftp which could be utilized to retrieve or exfiltrate data. 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. Die erstellten Log-Dateien knnen im Anschluss begutachtet und daraufhin die Zugriffskontrolllisten erstellt werden. All other programs from host 10.18.210.140 are not allowed to be registered. Giving more details is not possible, unfortunately, due to security reasons. The RFC Gateway act as an RFC Server which enables RFC function modules to be used by RFC clients. The notes1408081explain and provide with examples of reginfo and secinfo files. Examples of valid addresses are: Number (NO=): Number between 0 and 65535. File reginfocontrols the registration of external programs in the gateway. 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')). 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. Please note: SNC System ACL is not a feature of the RFC Gateway itself. This publication got considerable public attention as 10KBLAZE. In these cases the program alias is generated with a random string. The default value is: gw/sec_info = $(DIR_DATA)/secinfo gw/reg_info = $(DIR_DATA)/reginfo We should pretend as if we would maintain the ACLs of a stand-alone RFC Gateway. All programs started by hosts within the SAP system can be started on all hosts in the system. Its location is defined by parameter gw/reg_info. open transaction SMGW -> Goto -> expert functions -> Display secinfo/reginfo Green means OK, yellow warning, red incorrect. The first line of the reginfo/secinfo files must be # VERSION = 2. Program cpict2 is allowed to be registered, but can only be run and stopped on the local host or hostld8060. 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. Whrend der Freischaltung aller Verbindungen wird mit dem Gateway-Logging eine Aufzeichnung aller externen Programmaufrufe und Systemregistrierungen vorgenommen. 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"}. You have configured the SLD at the Java-stack of the SolMan system, using the RFC Gateway of the SolMans ABAP-stack. In SAP NetWeaver Application Server Java: The SCS instance has a built-in RFC Gateway. If you want to use this syntax, the whole file must be structured accordingly and the first line must contain the entry #VERSION=2 (written precisely in this format). This ACL is applied on the ABAP layer and is maintained in transaction SNC0. The RFC Gateway does not perform any additional security checks. 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. Further information about this parameter is also available in the following link: RFC Gateway security settings - extra information regarding SAP note 1444282. Part 1: General questions about the RFC Gateway and RFC Gateway security. The RFC Gateway can be used to proxy requests to other RFC Gateways. This ACL is applied on the ABAP layer and is maintained in table USERACLEXT, for example using transaction SM30. 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. 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 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). Specifically, it helps create secure ACL files. 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. Part 5: ACLs and the RFC Gateway security Prior to the change in the reginfo and Secinfo the rfc was defined on THE dialogue instance and IT was running okay. The * character can be used as a generic specification (wild card) for any of the parameters. As a result many SAP systems lack for example of proper defined ACLs to prevent malicious use. This publication got considerable public attention as 10KBLAZE. 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. Furthermore the means of some syntax and security checks have been changed or even fixed over time. Sie knnen die Queue-Auswahl reduzieren. Part 6: RFC Gateway Logging. RFCs between two SAP NetWeaver AS ABAP systems are typically controlled on network level only. Environment. The simulation mode is a feature which could help to initially create the ACLs. 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. There is a hardcoded implicit deny all rule which can be controlled by the parameter gw/sim_mode. 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