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Date: Tue, 19 Nov 2024 17:58:06 +0900
To: cygwin AT cygwin DOT com
Subject: Re: SMBFS mount's file cannot be made executable
Message-Id: <20241119175806.321cdb7e65a727a2eb58c8a6@nifty.ne.jp>
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From: Takashi Yano via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
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On Mon, 18 Nov 2024 17:26:12 +0100
Corinna Vinschen wrote:
> On Nov 16 00:21, Takashi Yano via Cygwin wrote:
> > I built a test program, whose important part is:
> > 
> >   AUTHZ_RESOURCE_MANAGER_HANDLE hManager = NULL;
> >   AUTHZ_CLIENT_CONTEXT_HANDLE hClient = NULL;
> >   AUTHZ_ACCESS_REQUEST AccessRequest = {0};
> >   AUTHZ_ACCESS_REPLY AccessReply = {0};
> > 
> >   AUTHZ_RPC_INIT_INFO_CLIENT authzRpcInitInfoClient = {0};
> > 
> >   WCHAR ObjectUuid[] = L"9a81c2bd-a525-471d-a4ed-49907c0b23da";
> >   WCHAR ProtSeq[] = L"ncacn_ip_tcp";
> >   WCHAR NetworkAddr[] = L"localhost";
> >   WCHAR Endpoint[] = L"135";
> > 
> >   authzRpcInitInfoClient.version = AUTHZ_INIT_INFO_VERSION_V1;
> >   authzRpcInitInfoClient.ObjectUuid = ObjectUuid;
> >   authzRpcInitInfoClient.ProtSeq = ProtSeq;
> >   authzRpcInitInfoClient.NetworkAddr = NetworkAddr;
> >   authzRpcInitInfoClient.Endpoint = Endpoint;
> > 
> >   AuthzInitializeRemoteResourceManager (&authzRpcInitInfoClient, &hManager);
> > 
> >   char buf[1024];
> >   PTOKEN_USER pTokenUser = (PTOKEN_USER) buf;
> >   DWORD len;
> > 
> >   GetTokenInformation(hToken, TokenUser, pTokenUser, 1024, &len);
> > 
> >   LUID luid = {0,};
> >   AuthzInitializeContextFromSid(0, pTokenUser->User.Sid, hManager,
> >                                 NULL, luid, NULL, &hClient);
> > 
> > 
> > This test code fails at AuthzInitializeContextFromSid() with
> > RPC_S_UNKNOWN_IF. If AuthzInitializeRemoteResourceManager()
> > is replaced with AuthzInitializeResourceManager(), the error
> > does not occur.
> > 
> > I searched the combination of AuthzInitializeContextFromSid()
> > and RPC_S_UNKNOWN_IF, however nothing was found.
> 
> RPC_S_UNKNOWN_IF means "unknown interface".  I assume this error has
> nothing to do with AuthzInitializeContextFromSid(), but with the
> AuthzInitializeRemoteResourceManager() call.
> 
> What I failed, though, is to find a working example for
> AuthzInitializeRemoteResourceManager().
> 
> > Any suggestion would be appreciated.
> 
> As I said in my previous posting, maybe we don't really need
> AuthzInitializeRemoteResourceManager().
> 
> We can safely assume that the current user is already authorized on the
> SMB server.  So... shouldn't AuthzInitializeResourceManager be
> sufficient and the code from class authz_ctx already does what we want?
> We may just have to use in in place of calling NtCheckAccess(),
> maybe with a tweak or two...

I already tried AuthzInitializeResourceManager(), but the result
was the same with current implementation...

BTW, I come up with another implementation. This make the things
much simpler. What do you think of the patch attached?

-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>

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