Re: Basic security question

From: Ivan Brugiolo [MSFT] (ivanbrug_at_online.microsoft.com)
Date: 06/19/04 

Date: Fri, 18 Jun 2004 19:36:05 -0700

> (e.g., why does "RegConnectRegistry()" succeed but then I can't retrieve
> values from the remote registry unless "WNetAddConnection2()" is called
> prior to "RegConnectRegistry()").

This seems the case of the "net use \\MachineName\IPC$" first before
using the remote resource if the RPC transport if over named pipe,
and if the current SubjectContext does not have a suitable security context
to negotiate authentication with the remote server.

"Programming Windows Security" form Keith Brown is good book. 

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"Rob Bolton" <_nospam@_nospam.com> wrote in message
news:eDzwYuZVEHA.2716@tk2msftngp13.phx.gbl...
> > It depends of the actual service you request on the remote machine, but
> most
> > often, the remote service that handles your request use impersonation,
> which
> > means it endorses your identity and credentials while working for you.
> This
> > way, all the escurity checks are made against your account.
> >
> > See ImpersonnateLoggedOnUser, ImpersonnateNamedPipeClient,
> > RPCImpersonnateClient, RevertToSelf and related functions in MSDN for
> > details.
>
> Thanks very much to both you and Ivan. Just to clarify then, if a process
on
> machine A makes a remote call to machine B via "RegConnectRegistry()" for
> example, two basic things typically happen:
>
> 1) Machine B first authenticates the identity associated with the thread
> that makes the call on machine A. This thread will usually be running
under
> the currently logged on user unless the thread is impersonating someone
else
> at the time. In either case, authentication will occur against the domain
> associated with that user (either machine A itself if the user is logged
in
> locally, the domain controller if the user is logged in against the domain
> controller, or possibly another workstation in the same or trusted
domain).
> 2) Once authenticated, that user will then be impersonated on machine B so
> the standard Windows security model now kicks in. That is, the access
token
> of anything that's executed on machine B will be the same as the thread
that
> launched this on machine A in the first place (and checked against all
DACLs
> on machine B as usual).
>
> I understand this is fairly simplistic and issues such as delegation and
so
> forth can cloud the picture, but is this basically correct or am I way out
> in left-field? BTW, can either of you recommend a good book or white-paper
> on the subject (remote security in particular). The basic Windows security
> model is fairly straight-forward but remote issues like this are murky
> (e.g., why does "RegConnectRegistry()" succeed but then I can't retrieve
> values from the remote registry unless "WNetAddConnection2()" is called
> prior to "RegConnectRegistry()"). Thanks again.
>
>

Relevant Pages

  • Re: Basic security question
    ... to negotiate authentication with the remote server. ... "Programming Windows Security" form Keith Brown is good book. ... >> often, the remote service that handles your request use impersonation,> which ... In either case, authentication will occur against the domain> associated with that user. ...
    (microsoft.public.win32.programmer.wmi)
  • Re: Basic security question
    ... to negotiate authentication with the remote server. ... "Programming Windows Security" form Keith Brown is good book. ... >> often, the remote service that handles your request use impersonation,> which ... In either case, authentication will occur against the domain> associated with that user. ...
    (microsoft.public.platformsdk.security)
  • Re: accessing remote resources from ASP.NET app
    ... You could also disable impersonation and set up your process account to use ... an account that access the remote resource. ... > I would like to avoid using delegation and serviced components, ...
    (microsoft.public.dotnet.framework.aspnet.security)
  • Re: [Full-disclosure] Question for the Windows pros
    ... What services running on Windows allow clients to access them? ... Or do they allow Remote Access? ... helps to have an understanding of what this privilege governs. ... *in general* what an impersonation privilege is. ...
    (Full-Disclosure)
  • Re: Basic security question
    ... > often, the remote service that handles your request use impersonation, ...
    (microsoft.public.win32.programmer.wmi)