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.NET Forum / .NET Framework / New Users / February 2007Controlling Windows Firewall from .Net
Hi, I have written a service which listens on a particular port (using remoting). The service runs under a user account with local admin rights. This service will run on XP/Server 2003/Vista. I need to either open the required port, or register my app with the Windows Firewall so it can receive requests. How can I do this from my code? I'd like to code a method to make the changes to the firewall when the servce is running, and then undo the changes when the service stops. I'm using VB.NET 2005 Cheers for any help Stu When you think it through, the last thing you actually want is an API that allows external applications to open ports. It would be a virus writers dream! > Hi, > [quoted text clipped - 12 lines] > > Stu Hmmmm... ok, so I just installed a copy of ftp voyager on my laptop, and it told me I had windows firewall running and asked if I wanted to open the required ports. How does it do that? osmosis ? > When you think it through, the last thing you actually want is an API that > allows external applications to open ports. It would be a virus writers [quoted text clipped - 16 lines] >> >> Stu Don't most firewalls just report when an application is trying to do something, you then get the chance to allow it / deny it through the firewall. I'd hate to think that there was a chance that the application could speak directly to the firewall to do this - all it would need was to find a way of surpressing any dialog popup (buffer overruns?) and the application gets the ability to do what it wants to the firewall. > Hmmmm... ok, so I just installed a copy of ftp voyager on my laptop, and > it told me I had windows firewall running and asked if I wanted to open [quoted text clipped - 22 lines] >>> >>> Stu Nothing Windows Firewall related popped up during the installation or operation of FTP Voyager. > Don't most firewalls just report when an application is trying to do > something, you then get the chance to allow it / deny it through the [quoted text clipped - 32 lines] >>>> >>>> Stu > Don't most firewalls just report when an application is trying to do > something, you then get the chance to allow it / deny it through the [quoted text clipped - 4 lines] > surpressing any dialog popup (buffer overruns?) and the application gets the > ability to do what it wants to the firewall. ... Windows firewall can be easily bypassed, given the administrative priveleges. There are already viruses that do that: http://www.sophos.com/virusinfo/analyses/trojagentco.html Anyway, windows firewall cannot stop any decent virus, as many use code injection into IE, for example (thus traffic originates from authorized application). But this is off-topic here. Regards, Goran Hello Stuart, See my post there http://groups.google.com/group/microsoft.public.dotnet.security/browse_thread/th read/28dbadee99ff7e3c/8f1ae788620df7c2 SP> Hi, SP> SP> I have written a service which listens on a particular port (using SP> remoting). The service runs under a user account with local admin SP> rights. This service will run on XP/Server 2003/Vista. SP> SP> I need to either open the required port, or register my app with the SP> Windows Firewall so it can receive requests. How can I do this from SP> my code? I'd like to code a method to make the changes to the SP> firewall when the servce is running, and then undo the changes when SP> the service stops. SP> SP> I'm using VB.NET 2005 SP> SP> Cheers for any help SP> SP> Stu SP> --- WBR, Michael Nemtsev [C# MVP]. Blog: http://spaces.live.com/laflour team blog: http://devkids.blogspot.com/ "The greatest danger for most of us is not that our aim is too high and we miss it, but that it is too low and we reach it" (c) Michelangel You star. Much appreciated > Hello Stuart, > [quoted text clipped - 20 lines] > "The greatest danger for most of us is not that our aim is too high and we > miss it, but that it is too low and we reach it" (c) Michelangelo OK. Ive added a reference to Firewall.DLL in my VB project (Vista has all the firewall stuff in Firewall.DLL and not HNetCfg.DLL like previous versions) So now I have an interop assembly presenting me with a bunch of interfaces. I may be being completely dumb here, but I can't NEW any of the objects. dim fwmgr as NetFwTypeLib.INetFwMgr = new ...... doesnt work. Using Object Browser, I see there are no New() constructors. What am I doing wrong ? Cheers Stu > You star. Much appreciated > [quoted text clipped - 23 lines] >> "The greatest danger for most of us is not that our aim is too high and >> we miss it, but that it is too low and we reach it" (c) Michelangelo > OK. Ive added a reference to Firewall.DLL in my VB project (Vista has > all the firewall stuff in Firewall.DLL and not HNetCfg.DLL like previous [quoted text clipped - 5 lines] > > dim fwmgr as NetFwTypeLib.INetFwMgr = new ...... doesnt work. You're using VB? The sample code I took a quick peek at all uses "CreateObject()" to instantiate the objects. I haven't done .NET in VB (only C#) so I don't know the significance of that, but maybe that's the problem. Have you tried just copying and pasting some of the sample code included in the MSDN documentation Michael referred you to? Pete The examples use VBScript, which creates the native COM objects. I'm trying to use VB.NET with interop. Adding a reference to the required .dll file in VB.NET produces an interop assembly. That interop assembly is what I'm coding against and it will not allow me to create new objects as they are presented as interfaces. Stu On Thu, 08 Feb 2007 08:11:52 -0800, Stuart Parker <no_chance@hell.com> wrote: > OK. Ive added a reference to Firewall.DLL in my VB project (Vista has all > the firewall stuff in Firewall.DLL and not HNetCfg.DLL like previous [quoted text clipped - 5 lines] > > dim fwmgr as NetFwTypeLib.INetFwMgr = new ...... doesnt work. You're using VB? The sample code I took a quick peek at all uses "CreateObject()" to instantiate the objects. I haven't done .NET in VB (only C#) so I don't know the significance of that, but maybe that's the problem. Have you tried just copying and pasting some of the sample code included in the MSDN documentation Michael referred you to? Pete
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