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POCross session activation. Session moniker ignored
 

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    <p>There are two accounts on my windows pc: \A1 and \SYSTEM. My test project consists of three applications: </p> <ol> <li>Server.exe - out-of-proc com server. implements object <strong>Q</strong></li> <li>Service.exe - out-of proc com service. implements object <strong>T</strong></li> <li>Client.exe - a client applications</li> </ol> <p>My workflow is shown below:</p> <ol> <li>I logged in the \A1. I launch 'Client.exe'.</li> <li>Client creates an instance of the object 'T' </li> <li>Client calls some method, say 'T.ActivateQ', which instantiates 'Q'. </li> </ol> <p>My intention is to make Service.exe to create an instance of 'Q' in the account \A1, even though Service.exe resides under the \SYSTEM account.</p> <p>As stated in <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa383255%28v=vs.85%29.aspx" rel="nofollow">this</a> article, Windows has built in functionality to do this kind of activation called 'Session-to-Session activation'. It is implemented by means of Session Moniker ("Session:!clsid:").</p> <p>Given that, I've configured 'Server.exe' to run as 'Interactive user' via dcomcnfg. Then I've implemented the function 'CoGetClassObjectInSession':</p> <pre><code>void CoGetClassObjectInSession(DWORD sessionId, Guid const&amp; clsid, void *pvReserved, Guid const&amp; riid, void **ppv) { ATL::CComQIPtr&lt;IBindCtx&gt; bindCtxInst; COMCHK(CreateBindCtx(NULL, &amp;bindCtxInst)); CComQIPtr&lt;IMoniker&gt; classMonikerInst; COMCHK(::CreateClassMoniker(clsid, &amp;classMonikerInst)); std::wstringstream ss; ss &lt;&lt; L"Session:" &lt;&lt; std::dec &lt;&lt; sessionId; ULONG parsed; ATL::CComQIPtr&lt;IMoniker&gt; sessionMonikerInst; COMCHK(::MkParseDisplayNameEx(bindCtxInst, ss.str().c_str(), &amp;parsed, &amp;sessionMonikerInst)); ATL::CComQIPtr&lt;IMoniker&gt; classObjectMoniker; COMCHK(sessionMonikerInst-&gt;ComposeWith(classMonikerInst, FALSE, &amp;classObjectMoniker)); ATL::CComPtr&lt;IClassFactory&gt; sessionFactoryInst; COMCHK(classObjectMoniker-&gt;BindToObject(bindCtxInst, NULL, riid, ppv)); } </code></pre> <p>and I use it in the service:</p> <pre><code>HRESULT CMyActivator::Activate() { try { // Impersonate the client CComQIPtr&lt;IServerSecurity&gt; ss; COMCHK(::CoGetCallContext(__uuidof(IServerSecurity), reinterpret_cast&lt;void**&gt;(&amp;ss))); callctx_impersonation_handle _handle(ss); ImpersonationScope _imp_scope(_handle); CComQIPtr&lt;IClassFactory&gt; ppv; CoGetClassObjectInSession(/*session id for \\A1*/ 1, Guid(__uuidof(Q)), nullptr, Guid(__uuidof(IClassFactory)), reinterpret_cast&lt;void**&gt;(&amp;ppv)); ENSURE(NULL != ppv, "'ppv' should not be null"); return S_OK; } catch(std::exception const&amp; ex) { return E_FAIL; } catch(...) { return E_FAIL; } } </code></pre> <p>But nothing happens. I mean the service always launches the server in the session 0 which corresponds to the \SYSTEM account.</p> <p>Client's security settings:</p> <pre><code>COMCHK(::CoSetProxyBlanket( activatorQ , RPC_C_AUTHN_DEFAULT , RPC_C_AUTHZ_DEFAULT , NULL , RPC_C_AUTHN_LEVEL_DEFAULT , RPC_C_IMP_LEVEL_DELEGATE , NULL , EOAC_DYNAMIC_CLOAKING)); </code></pre> <p>Server.rgs file:</p> <pre><code>HKLM { NoRemove Software { NoRemove Classes { NoRemove AppID { ForceRemove '%APPID%' = s 'Test Server' { val RunAs = s 'Interactive User' } } } } } </code></pre> <p>Am I doing something wrong? </p> <p><strong>UPDATE</strong> I've finally found a solution. The registration script for the class 'Q' was missing the AppID field:</p> <pre><code>HKCR { NoRemove CLSID { ForceRemove {6FDE856C-F1B2-4466-8435-20F4AEF2C2E1} = s 'SMonClass Class' { ForceRemove Programmable LocalServer32 = s '%MODULE%' { val ServerExecutable = s '%MODULE_RAW%' } TypeLib = s '{4FA39B0F-5B24-43C6-A5B1-11D8F34277B7}' Version = s '1.0' --&gt; val AppID = s '%APPID%'** &lt;-- This line } } } </code></pre>
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    1. USIgor Chornous
    1. USIgor Chornous
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    1. COwhat is monker???
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      1. USBЈовић
    2. CO@VJovic, [Here](http://msdn.microsoft.com/en-us/library/windows/desktop/ms691261(v=vs.85).aspx) you may find a good explanation
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      1. USIgor Chornous
    3. COWouldn't it be much simpler for the client to instantiate a Q (which would automatically be in the right session) and pass it to T?
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