Fix named pipe security on Windows 7

src/shared/Communication.cpp

 #include <Windows.h>
 #include <Lmcons.h>
 #include <Sddl.h>
 #include <aclapi.h>
 #include <strsafe.h>
 
 #include "AutoHandle.h"
 #include "Communication.h"
 #include "Utils.h"
 
@@ skipping 90 matching lines @@
       PACL acl = 0;
       if (SetEntriesInAcl(2, explicitAccess, 0, &acl) != ERROR_SUCCESS)
         return std::auto_ptr<SECURITY_DESCRIPTOR>(0);
 
       // NOTE: This only references the acl, not copies it. 
       // DO NOT release the ACL before it's actually used
       if (!SetSecurityDescriptorDacl(securityDescriptor.get(), TRUE, acl, FALSE))
         return std::auto_ptr<SECURITY_DESCRIPTOR>(0);
     }
 
-    // Create a dummy security descriptor with low integrirty preset and refference its SACL in ours
+    // Create a dummy security descriptor with low integrirty preset and reference its SACL in ours
     LPCWSTR accessControlEntry = L"S:(ML;;NW;;;LW)";
     PSECURITY_DESCRIPTOR dummySecurityDescriptorLow;
     ConvertStringSecurityDescriptorToSecurityDescriptorW(accessControlEntry, SDDL_REVISION_1, &dummySecurityDescriptorLow, 0);
     std::tr1::shared_ptr<SECURITY_DESCRIPTOR> sharedDummySecurityDescriptor(static_cast<SECURITY_DESCRIPTOR*>(dummySecurityDescriptorLow), LocalFree); // Just to simplify cleanup
 
     DWORD sdSize(0), saclSize(0), daclSize(0), ownerSize(0), primaryGroupSize(0);
     MakeAbsoluteSD(dummySecurityDescriptorLow, 0, &sdSize, 0, &daclSize, 0, &saclSize, 0, &ownerSize, 0, &primaryGroupSize);
     if (saclSize == 0 || sdSize == 0)
     {
         return std::auto_ptr<SECURITY_DESCRIPTOR>(0);
@@ skipping 170 matching lines @@
   return Communication::InputBuffer(stream.str());
 }
 
 void Communication::Pipe::WriteMessage(Communication::OutputBuffer& message)
 {
   DWORD bytesWritten;
   std::string data = message.Get();
   if (!WriteFile(pipe, data.c_str(), static_cast<DWORD>(data.length()), &bytesWritten, 0))
     throw std::runtime_error("Failed to write to pipe");
 }