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. As a result many SAP systems lack for example of proper defined ACLs to prevent malicious use. Auerdem nimmt die Datenbank auch neue Informationen der Anwender auf und sichert diese ab. Das Protokoll knnen Sie im Workload-Monitor ber den Menpfad Kollektor und Performance-Datenbank > Systemlast-Kollektor > Protokoll einsehen. Part 5: ACLs and the RFC Gateway security. Terms of use |
Program cpict4 is allowed to be registered by any host. Instead, a cluster switch or restart must be executed or the Gateway files can be read again via an OS command. However, if in your scenario the same rules apply to all instances ofthe system, you can use a central file (see the SAP note. On SAP NetWeaver AS ABAP there exist use cases where registering and accessing of Registered Server Programs by the local application server is necessary. Support Packages fr eine ausgewhlte Komponente werden entsprechend ihrer Reihenfolge in die Queue gestellt. In a pure Java system, one Gateway is sufficient for the whole system because the instances do not use RFC to communicate. Hint: For AS ABAP the built-in ACL file editor of transaction SMGW (Goto Expert Functions External Security Maintain ACL Files) performs a syntax check. Programs within the system are allowed to register. 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. 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). When using SNC to secure logon for RFC Clients or Registered Server Programs the so called SNC User ACL, also known as User Authentication, is introduced and must be maintained accordingly. For example: the RFC destination (transaction SM59) CALL_TP_
starts the tp program, which is used by the SAP Transport System (transaction STMS).Before jumping to the ACLs themselves, here are a few general tips: A general reginfo rule definition would be (note that the rule was split into multiple lines for explanation purposes, so it is more easily understood): Usually, ACCESS is a list with at least all SAP servers from this SAP system. 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. ABAP SAP Basis Release as from 7.40 . 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. 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 und reginfo Generator anfordern Mglichkeit 1: Restriktives Vorgehen Fr den Fall des restriktiven . The RFC Gateway does not perform any additional security checks. BC-CST-GW , Gateway/CPIC , BC-NET , Network Infrastructure , Problem . Its functions are then used by the ABAP system on the same host. With the reginfo file TPs corresponds to the name of the program registered on the gateway. If these profile parameters are not set the default rules would be the following allow all rules: reginfo: P TP=* D prevents this program from being registered on the gateway. As separators you can use commas or spaces. Each line must be a complete rule (rules cannot be broken up over two or more lines). Hufig ist man verpflichtet eine Migration durchzufhren. Darber hinaus stellt die dauerhafte manuelle Freischaltung einzelner Verbindungen einen stndigen Arbeitsaufwand dar. Auch hier ist jedoch ein sehr groer Arbeitsaufwand vorhanden. No error is returned, but the number of cancelled programs is zero. Part 2: reginfo ACL in detail. Note: depending on the systems settings, it will not be the RFC Gateway itself that will start the program. Please note: One should be aware that starting a program using the RFC Gateway is an interactive task. The location of the reginfo ACL file is specified by the profile parameter gw/reg_info. Part 5: ACLs and the RFC Gateway security. If the Gateway Options are not specified the AS will try to connect to the RFC Gateway running on the same host. Part 5: Security considerations related to these ACLs. It is common to define this rule also in a custom reginfo file as the last rule. The first line of the reginfo/secinfo files must be # VERSION = 2. See the examples in the note1592493; 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 will continue following the old rules; 3)The rules in the secinfo and reginfo file do not always use the same syntax, it depends of the VERSION defined in the file. 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. It also enables communication between work or server processes of SAP NetWeaver AS and external programs. 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 ACL is applied on the ABAP layer and is maintained in table USERACLEXT, for example using transaction SM30. The RFC library provides functions for closing registered programs. 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. The RFC Gateway does not perform any additional security checks. 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). Examples of valid addresses are: Number (NO=): Number between 0 and 65535. Please pay special attention to this phase! Once you have completed the change, you can reload the files without having to restart the gateway. This opensb the Gateway ACL Editor, where you can display the relevant files.. To enable system-internal communication, the files must contain the . Checking the Security Configuration of SAP Gateway. The keyword internal will be substituted at evaluation time by a list of hostnames of application servers in status ACTIVE which is periodically sent to all connected RFC Gateways. In the previous parts we had a look at the different ACLs and the scenarios in which they are applied. Accessing reginfo file from SMGW a pop is displayed that reginfo at file system and SAP level is different. TP is restricted to 64 non-Unicode characters for both secinfo and reginfo files. 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). Example Example 1: This is because the rules used are from the Gateway process of the local instance. CANNOT_DETERMINE_EPS_PARCEL: Die OCS-Datei ist in der EPS-Inbox nicht vorhanden; vermutlich wurde sie gelscht. It registers itself with the program alias IGS. at the RFC Gateway of the same application server. This parameter will enable special settings that should be controlled in the configuration of reginfo file. 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. The simulation mode is a feature which could help to initially create the ACLs. What is important here is that the check is made on the basis of hosts and not at user level. 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. Configuring Connections between SAP Gateway and External Programs Securely, SAP Gateway Security Files secinfo and reginfo, Setting Up Security Settings for External Programs. Part 4: prxyinfo ACL in detail This publication got considerable public attention as 10KBLAZE. Legal Disclosure |
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 For example: an SAP SLD system registering the SLD_UC and SLD_NUC programs at an ABAP system. File reginfocontrols the registration of external programs in the gateway. 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. Its location is defined by parameter 'gw/reg_info'. From my experience the RFC Gateway security is for many SAP Administrators still a not well understood topic. CANCEL is usually a list with all SAP servers from this system (or the keyword "internal"), and also the same servers as in HOSTS (as you must allow the program to de-register itself). RFCs between two SAP NetWeaver AS ABAP systems are typically controlled on network level only. If the TP name itself contains spaces, you have to use commas instead. After the external program was registered, the ACCESS and CANCEL options will be followed as defined in the rule, if a rule existed. 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. Refer to the SAP Notes 2379350 and2575406 for the details. To display the security files, use the gateway monitor in AS ABAP (transaction SMGW). A custom allow rule has to be maintained on the proxying RFC Gateway only. 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). Somit knnen keine externe Programme genutzt werden. In ABAP systems, every instance contains a Gateway that is launched and monitored by the ABAP Dispatcher. As we learned in part 3 SAP introduced the following internal rule in the in the secinfo ACL: To control access from the client side too, you can define an access list for each entry. As i suspect it should have been registered from Reginfo file rather than OS. P TP=* USER=* USER-HOST=internal HOST=internal. In this case the Gateway Options must point to exactly this RFC Gateway host. In other words, the SAP instance would run an operating system level command. 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]. If no cancel list is specified, any client can cancel the program. Part 6: RFC Gateway Logging 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). As a result many SAP systems lack for example of proper defined ACLs to prevent malicious use. 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. IP Addresses (HOST=, ACCESS= and/or CANCEL=): You can use IP addresses instead of host names. Part 7: Secure communication This is for clarity purposes. Sie knnen die Queue-Auswahl reduzieren. The name of the registered program will be TAXSYS. Part 4: prxyinfo ACL in detail. there are RED lines on secinfo or reginfo tabs, even if the rule syntax is correct. The location of this ACL can be defined by parameter gw/acl_info. P SOURCE=* DEST=*. Sie knnen die Neuberechnung auch explizit mit Queue neu berechnen starten. 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. This means the call of a program is always waiting for an answer before it times out. Its location is defined by parameter gw/reg_info. Sie knnen anschlieend die Registerkarten auf der CMC-Startseite sehen. There are other SAP notes that help to understand the syntax (refer to the Related notes section below). In addition, the existing rules on the reginfo/secinfo file will be applied, even on Simulation Mode. The reginfo file have ACLs (rules) related to the registration of external programs (systems) to the local SAP instance. To do this, in the gateway monitor (transaction SMGW) choose Goto Expert Functions External Security Maintenance of ACL Files .. 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. 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. 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 production systems, generic rules should not be permitted. Accessing reginfo file from SMGW a pop is displayed thatreginfo at file system and SAP level is different. 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. Part 1: General questions about the RFC Gateway and RFC Gateway security. Its location is defined by parameter gw/prxy_info. 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. Limiting access to this port would be one mitigation. Visit SAP Support Portal's SAP Notes and KBA Search. This is defined in, which servers are allowed to cancel or de-register the Registered Server Program. When editing these ACLs we always have to think from the perspective of each RFC Gateway to which the ACLs are applied to. Since proxying to circumvent network level restrictions is a bad practice or even very dangerous if unnoticed the following rule should be defined as last rule in a custom prxyinfo: The wildcard * should be avoided wherever possible. The RFC destination would look like: The secinfo files from the application instances are not relevant. 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')). Program cpict2 is allowed to be registered, but can only be run and stopped on the local host or hostld8060. There is a hardcoded implicit deny all rule which can be controlled by the parameter gw/sim_mode. 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. All programs started by hosts within the SAP system can be started on all hosts in the system. 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. This is for example used by AS ABAP when starting external commands using transaction SM49/SM69. Access to the ACL files must be restricted. The prxyinfo file is holding rules controlling which source systems (based on their hostname/ip-address) are allowed to talk to which destination systems (based on their hostname/ip-address) over the current RFC Gateway. 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. This means that the sequence of the rules is very important, especially when using general definitions. Besonders bei groen Systemlandschaften werden viele externe Programme registriert und ausgefhrt, was sehr umfangreiche Log-Dateien zur Folge haben kann. 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). Should a cyberattack occur, this will give the perpetrators direct access to your sensitive SAP systems. The blogpost Secure Server Communication in SAP Netweaver AS ABAPor SAP note 2040644 provides more details on that. Da das aber gewnscht ist, mssen die Zugriffskontrolllisten schrittweise um jedes bentigte Programm erweitert 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. Furthermore the means of some syntax and security checks have been changed or even fixed over time. For example: the system has the CI (hostname sapci) and two application instances (hostnames appsrv1 and appsrv2). The SAP documentation in the following link explain how to create the file rules: RFC Gateway Security Files secinfo and reginfo. Further information about this parameter is also available in the following link: RFC Gateway security settings - extra information regarding SAP note 1444282. At time of writing this can not be influenced by any profile parameter. 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