Filtering URLs by using Permission Table in SAP Web Dispatcher

Let us say, you have installed a Web Dispatcher in the DMZ and it is used so that the business partners can send SOAP messages over the internet to you. From a security perspective, you may want the business partners to access the SOAP URLs alone; they should even be calling admin related URLs.

To achieve this, you can use a permission table (ptab) in the Web Dispatcher.

Create a file (say ptabfile) which allows SOAP URL pattern /XISOAPAdapter/MessagingServlet*, so that a call to the SOAP URL (http://<host>:<port>/XISOAPAdapter/MessagingServlet?channel=<party>:<sendersystem>:<CC_sender>) is permitted. The contents of the file would then be:

P    /XISOAPAdapter/MessagingServlet*
D   *

Add the following parameter to the web dispatcher profile file:
wdisp/permission_table = <absolute_path_to_ptabfile>

Restart web dispatcher for the change to get activated.

When a call to the web dispatcher is made containing the pattern http(s)://<web dispatcher host>:<web dispatcher port>/XISOAPAdapter/MessagingServlet*, the Web Dispatcher reads the first line of the ptabfile and finds that it is permitted. As it is a valid rule, it stops evaluating further permissions (thereby ignoring deny all patterns D   *). The end result is that the caller can proceed further.

If a call to the WD admin port (http(s)://<web dispatcher host>:<web dispatcher port>/sap/admin) is made (for example), the WD evaluates the first line, finds it irrelevant, then proceeds to the next line which matches the URI and evaluates it a deny all. The end-user/business partner calling this URL will get a 403 error.

Comments

Post a Comment

Popular posts from this blog

OS/DB Migration - CMD. STR, TOC, EXT, R3load, DDLDBS.TPL and more

Image
With increasing need to improve performance or reduce costs or vanishing support for operating systems/databases it becomes inevitable to migrate to a better OS or DB. We feel take a quick look at the primary ingredients of the tools for OS/DB migration handled by R3SETUP. Tools - R3load, R3ldctl and R3szchk R3ldctl creates STRucture files, TemPLate files by reading the technical settings for table/indexes in SAP data dictionary. R3szchk calculates the database size object sizes (EXTent files) for the target system based on the STR files created by R3ldctl. The EXT and STR files can be later split into smaller groups. The most crucial tool R3load is responsible for unloading and loading data from the database. R3load uses the files created by R3ldctl and R3szchk and dumps the data into compressed binary format as .001, .002 .. files. It uses cmd files to achieve the task. If the cmd files are not present, it creates on its own. Files Command files*.cmd  are created i
Read more

Fixing Inconsistent Table - Table activation fails due to inconsistency between DD and DB

If you find a table to be available on the database, but not active in ABAP dictionary, try calling SE14 as DDIC user, enter the table name and choose Table > Reconstruct, Execute. If this method fails follow these steps: Call transaction code SE37 and execute the function module  DD_TABL_ACTM with single test On the next screen, do not change any other field except the following and set them as shown below: MODE: 12 NTAB_PUTSTATE: N TABNAME: <enter the correct table name> Click on Execute The export parameter ACT_RESULT should show 0. To verify if the inconsistency is fixed, call transaction SE14 > Extras > Database Object > Check and  SE14 > Extras > Runtime object > Check.
Read more

301 Redirect Using SAP Web Dispatcher

301 redirects are typically used to redirect accesses that include www to non-www or vice-versa. Example, when you call http://blogger.com, the call is redirected to www.blogger.com. An end-user may prefer to call a URL in any manner. You must ensure that all these calls are redirected to relevant URLs with content. SAP web dispatcher can be configured to send a redirect (301) to the client. To enable redirection add icm/HTTP/redirect_<xx> to the web dispatcher's profile file. The parameter uses the following syntax: icm/HTTP/redirect_<xx> = PREFIX=<URL prefix>[, FROM=<pattern for URL>, FROMPROT=<incoming protocol>, FOR=<pattern for host name:port>,TO=<new URL prefix>, PROT=<protocol>, HOST=<host>, PORT=<port number/name>] Let's say you want to redirect all the HTTP requests on mysource.com on 80 port to mytarget.com on HTTPS 443 port icm/HTTP/redirect_0 = PREFIX=/, FROM=*, FROMPROT=http, FOR=mysource.com:80,
Read more