Microsoft RPC (MSRPC) support

All,

I have a Windows Server inside my firewall which service must be reached via Microsoft-style RPC (MSRPC) by customers who are outside. How to set the proper firewall? (In which case it is important, the code is FWSM Firewall Version 2.3 (1).)

If I understand correctly, MSRPC works as follows. (Please alert me on mistakes.) The customer wants to use a service that provides the server, but the service was not a well known port number. Instead, the service is identified by a famous 'programme number.' The customer contacts 135/tcp port on the server, specifies the number of program of your choice and says on what port number of the service is listening. The customer then proceeds to contact service in the usual way (fee connection; full negotiating TCP) on the port, that he learned to use.

This behavior is a problem. The firewall must allow second connection of the client, but the port of destination may not be known (or so configured in the firewall) in advance. In support of MSRPC, therefore, I expect the firewall to have a correction. There no one for MSRPC, if it is of * seem * to have a non configurable for Sun RPC style. (See PIX Firewall & VPN Config Guide p. 5-29) It is supposed to be a SunRPC correction, example of the documentation implies that you just need to identify the service port forward using "rpcinfo" on the client, and then configure the firewall in a static way. Is it really a good idea? It is possible for the service to use a different port at different times, correct? And how is what is considered fixup? (What correction happening?)

In any case, documentation mentions MSRPC again in the Appendix devoted to support MS Exhange and suggests the use of the command 'established '. Documentation for this command, however, said that it "allows outbound connections back through the PIX firewall access.» In my case, I am concerned by the incoming connections.

Thanks a lot for any advice you can offer.

Christopher Ursich

I'm not a PIX / IOS fix up for this. But it's how Microsoft is going to solve this problem:

http://msdn.Microsoft.com/library/default.asp?url=/library/en-us/dndcom/html/msdn_dcomfirewall.asp

< very="" brief="" summary="" of="" the="" above="" document="">>

Restrict the range of TCP Ports

There are several registry settings that control the functionality of DCOM ports restriction. All of the below named values are located under the key HKEY_LOCAL_MACHINE\Software\Microsoft\Rpc\Internet registry (that you must create). Remember, just do it on the server machine. Customers will automatically get port numbers right when they connect to the MCU on the server machine.

Name ports

Type REG_MULTI_SZ.

Value of 3000-4000 (specify a port range per line. One or more ranges of ports. )

Your firewall configuration

The firewall between your server and the Internet must be configured as follows:

Refuse all incoming traffic from the Internet to your server.

Allow incoming traffic to all customers for the TCP 135 port (and the port UDP 135, if necessary) on your server.

Allow incoming traffic from all the clients to TCP ports (UDP ports and, if necessary) on your server in the range of Ports (s) indicated above.

Volker greetings

Tags: Cisco Security

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