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qemu/qga/vss-win32/install.cpp
Tomoki Sekiyama bca4bf1028 qemu-ga: vss-win32: Install VSS provider COM+ application service 
Currently, qemu-ga for Windows fails to execute guset-fsfreeze-freeze when
no user is logging in to Windows, with an error message:
  {"error":{"class":"GenericError",
            "desc":"failed to add C:\\ to snapshotset:  (error: 8004230f)"}}

To enable guest-fsfreeze-freeze/thaw without logging in users, this installs
a service to execute qemu-ga VSS provider COM+ application that has full
access privileges to the local system. The service will automatically be
removed when the COM+ application is deregistered.

This patch replaces ICOMAdminCatalog interface with ICOMAdminCatalog2
interface that contains CreateServiceForApplication() method in addition.

Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama@hds.com>
Reviewed-by: Gal Hammer <ghammer@redhat.com>
Reviewed-by: Yan Vugenfirer <yvugenfi@redhat.com>
Tested-by: Yan Vugenfirer <yvugenfi@redhat.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2013-11-22 15:14:05 -06:00

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/*
* QEMU Guest Agent win32 VSS Provider installer
*
* Copyright Hitachi Data Systems Corp. 2013
*
* Authors:
* Tomoki Sekiyama <tomoki.sekiyama@hds.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include <stdio.h>
#include <string.h>
#include "vss-common.h"
#include "inc/win2003/vscoordint.h"
#include <comadmin.h>
#include <wbemidl.h>
#include <comdef.h>
#include <comutil.h>
extern HINSTANCE g_hinstDll;
const GUID CLSID_COMAdminCatalog = { 0xF618C514, 0xDFB8, 0x11d1,
{0xA2, 0xCF, 0x00, 0x80, 0x5F, 0xC7, 0x92, 0x35} };
const GUID IID_ICOMAdminCatalog2 = { 0x790C6E0B, 0x9194, 0x4cc9,
{0x94, 0x26, 0xA4, 0x8A, 0x63, 0x18, 0x56, 0x96} };
const GUID CLSID_WbemLocator = { 0x4590f811, 0x1d3a, 0x11d0,
{0x89, 0x1f, 0x00, 0xaa, 0x00, 0x4b, 0x2e, 0x24} };
const GUID IID_IWbemLocator = { 0xdc12a687, 0x737f, 0x11cf,
{0x88, 0x4d, 0x00, 0xaa, 0x00, 0x4b, 0x2e, 0x24} };
void errmsg(DWORD err, const char *text)
{
/*
* `text' contains function call statement when errmsg is called via chk().
* To make error message more readable, we cut off the text after '('.
* If text doesn't contains '(', negative precision is given, which is
* treated as though it were missing.
*/
char *msg = NULL, *nul = strchr(text, '(');
int len = nul ? nul - text : -1;
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(char *)&msg, 0, NULL);
fprintf(stderr, "%.*s. (Error: %lx) %s\n", len, text, err, msg);
LocalFree(msg);
}
static void errmsg_dialog(DWORD err, const char *text, const char *opt = "")
{
char *msg, buf[512];
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(char *)&msg, 0, NULL);
snprintf(buf, sizeof(buf), "%s%s. (Error: %lx) %s", text, opt, err, msg);
MessageBox(NULL, buf, "Error from " QGA_PROVIDER_NAME, MB_OK|MB_ICONERROR);
LocalFree(msg);
}
#define _chk(hr, status, msg, err_label) \
do { \
hr = (status); \
if (FAILED(hr)) { \
errmsg(hr, msg); \
goto err_label; \
} \
} while (0)
#define chk(status) _chk(hr, status, "Failed to " #status, out)
void __stdcall _com_issue_error(HRESULT hr)
{
errmsg(hr, "Unexpected error in COM");
}
template<class T>
HRESULT put_Value(ICatalogObject *pObj, LPCWSTR name, T val)
{
return pObj->put_Value(_bstr_t(name), _variant_t(val));
}
/* Lookup Administrators group name from winmgmt */
static HRESULT GetAdminName(_bstr_t *name)
{
HRESULT hr;
COMPointer<IWbemLocator> pLoc;
COMPointer<IWbemServices> pSvc;
COMPointer<IEnumWbemClassObject> pEnum;
COMPointer<IWbemClassObject> pWobj;
ULONG returned;
_variant_t var;
chk(CoCreateInstance(CLSID_WbemLocator, NULL, CLSCTX_INPROC_SERVER,
IID_IWbemLocator, (LPVOID *)pLoc.replace()));
chk(pLoc->ConnectServer(_bstr_t(L"ROOT\\CIMV2"), NULL, NULL, NULL,
0, 0, 0, pSvc.replace()));
chk(CoSetProxyBlanket(pSvc, RPC_C_AUTHN_WINNT, RPC_C_AUTHZ_NONE,
NULL, RPC_C_AUTHN_LEVEL_CALL,
RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE));
chk(pSvc->ExecQuery(_bstr_t(L"WQL"),
_bstr_t(L"select * from Win32_Account where "
"SID='S-1-5-32-544' and localAccount=TRUE"),
WBEM_FLAG_RETURN_IMMEDIATELY | WBEM_FLAG_FORWARD_ONLY,
NULL, pEnum.replace()));
if (!pEnum) {
hr = E_FAIL;
errmsg(hr, "Failed to query for Administrators");
goto out;
}
chk(pEnum->Next(WBEM_INFINITE, 1, pWobj.replace(), &returned));
if (returned == 0) {
hr = E_FAIL;
errmsg(hr, "No Administrators found");
goto out;
}
chk(pWobj->Get(_bstr_t(L"Name"), 0, &var, 0, 0));
try {
*name = var;
} catch(...) {
hr = E_FAIL;
errmsg(hr, "Failed to get name of Administrators");
goto out;
}
out:
return hr;
}
/* Find and iterate QGA VSS provider in COM+ Application Catalog */
static HRESULT QGAProviderFind(
HRESULT (*found)(ICatalogCollection *, int, void *), void *arg)
{
HRESULT hr;
COMInitializer initializer;
COMPointer<IUnknown> pUnknown;
COMPointer<ICOMAdminCatalog2> pCatalog;
COMPointer<ICatalogCollection> pColl;
COMPointer<ICatalogObject> pObj;
_variant_t var;
long i, n;
chk(CoCreateInstance(CLSID_COMAdminCatalog, NULL, CLSCTX_INPROC_SERVER,
IID_IUnknown, (void **)pUnknown.replace()));
chk(pUnknown->QueryInterface(IID_ICOMAdminCatalog2,
(void **)pCatalog.replace()));
chk(pCatalog->GetCollection(_bstr_t(L"Applications"),
(IDispatch **)pColl.replace()));
chk(pColl->Populate());
chk(pColl->get_Count(&n));
for (i = n - 1; i >= 0; i--) {
chk(pColl->get_Item(i, (IDispatch **)pObj.replace()));
chk(pObj->get_Value(_bstr_t(L"Name"), &var));
if (var == _variant_t(QGA_PROVIDER_LNAME)) {
if (FAILED(found(pColl, i, arg))) {
goto out;
}
}
}
chk(pColl->SaveChanges(&n));
out:
return hr;
}
/* Count QGA VSS provider in COM+ Application Catalog */
static HRESULT QGAProviderCount(ICatalogCollection *coll, int i, void *arg)
{
(*(int *)arg)++;
return S_OK;
}
/* Remove QGA VSS provider from COM+ Application Catalog Collection */
static HRESULT QGAProviderRemove(ICatalogCollection *coll, int i, void *arg)
{
HRESULT hr;
fprintf(stderr, "Removing COM+ Application: %s\n", QGA_PROVIDER_NAME);
chk(coll->Remove(i));
out:
return hr;
}
/* Unregister this module from COM+ Applications Catalog */
STDAPI COMUnregister(void)
{
HRESULT hr;
DllUnregisterServer();
chk(QGAProviderFind(QGAProviderRemove, NULL));
out:
return hr;
}
/* Register this module to COM+ Applications Catalog */
STDAPI COMRegister(void)
{
HRESULT hr;
COMInitializer initializer;
COMPointer<IUnknown> pUnknown;
COMPointer<ICOMAdminCatalog2> pCatalog;
COMPointer<ICatalogCollection> pApps, pRoles, pUsersInRole;
COMPointer<ICatalogObject> pObj;
long n;
_bstr_t name;
_variant_t key;
CHAR dllPath[MAX_PATH], tlbPath[MAX_PATH];
bool unregisterOnFailure = false;
int count = 0;
if (!g_hinstDll) {
errmsg(E_FAIL, "Failed to initialize DLL");
return E_FAIL;
}
chk(QGAProviderFind(QGAProviderCount, (void *)&count));
if (count) {
errmsg(E_ABORT, "QGA VSS Provider is already installed");
return E_ABORT;
}
chk(CoCreateInstance(CLSID_COMAdminCatalog, NULL, CLSCTX_INPROC_SERVER,
IID_IUnknown, (void **)pUnknown.replace()));
chk(pUnknown->QueryInterface(IID_ICOMAdminCatalog2,
(void **)pCatalog.replace()));
/* Install COM+ Component */
chk(pCatalog->GetCollection(_bstr_t(L"Applications"),
(IDispatch **)pApps.replace()));
chk(pApps->Populate());
chk(pApps->Add((IDispatch **)&pObj));
chk(put_Value(pObj, L"Name", QGA_PROVIDER_LNAME));
chk(put_Value(pObj, L"Description", QGA_PROVIDER_LNAME));
chk(put_Value(pObj, L"ApplicationAccessChecksEnabled", true));
chk(put_Value(pObj, L"Authentication", short(6)));
chk(put_Value(pObj, L"AuthenticationCapability", short(2)));
chk(put_Value(pObj, L"ImpersonationLevel", short(2)));
chk(pApps->SaveChanges(&n));
/* The app should be deleted if something fails after SaveChanges */
unregisterOnFailure = true;
chk(pObj->get_Key(&key));
if (!GetModuleFileName(g_hinstDll, dllPath, sizeof(dllPath))) {
hr = HRESULT_FROM_WIN32(GetLastError());
errmsg(hr, "GetModuleFileName failed");
goto out;
}
n = strlen(dllPath);
if (n < 3) {
hr = E_FAIL;
errmsg(hr, "Failed to lookup dll");
goto out;
}
strcpy(tlbPath, dllPath);
strcpy(tlbPath+n-3, "tlb");
fprintf(stderr, "Registering " QGA_PROVIDER_NAME ":\n");
fprintf(stderr, " %s\n", dllPath);
fprintf(stderr, " %s\n", tlbPath);
if (!PathFileExists(tlbPath)) {
hr = HRESULT_FROM_WIN32(ERROR_FILE_NOT_FOUND);
errmsg(hr, "Failed to lookup tlb");
goto out;
}
chk(pCatalog->CreateServiceForApplication(
_bstr_t(QGA_PROVIDER_LNAME), _bstr_t(QGA_PROVIDER_LNAME),
_bstr_t(L"SERVICE_AUTO_START"), _bstr_t(L"SERVICE_ERROR_NORMAL"),
_bstr_t(L""), _bstr_t(L".\\localsystem"), _bstr_t(L""), FALSE));
chk(pCatalog->InstallComponent(_bstr_t(QGA_PROVIDER_LNAME),
_bstr_t(dllPath), _bstr_t(tlbPath),
_bstr_t("")));
/* Setup roles of the applicaion */
chk(pApps->GetCollection(_bstr_t(L"Roles"), key,
(IDispatch **)pRoles.replace()));
chk(pRoles->Populate());
chk(pRoles->Add((IDispatch **)pObj.replace()));
chk(put_Value(pObj, L"Name", L"Administrators"));
chk(put_Value(pObj, L"Description", L"Administrators group"));
chk(pRoles->SaveChanges(&n));
chk(pObj->get_Key(&key));
/* Setup users in the role */
chk(pRoles->GetCollection(_bstr_t(L"UsersInRole"), key,
(IDispatch **)pUsersInRole.replace()));
chk(pUsersInRole->Populate());
chk(pUsersInRole->Add((IDispatch **)pObj.replace()));
chk(GetAdminName(&name));
chk(put_Value(pObj, L"User", _bstr_t(".\\") + name));
chk(pUsersInRole->Add((IDispatch **)pObj.replace()));
chk(put_Value(pObj, L"User", L"SYSTEM"));
chk(pUsersInRole->SaveChanges(&n));
out:
if (unregisterOnFailure && FAILED(hr)) {
COMUnregister();
}
return hr;
}
static BOOL CreateRegistryKey(LPCTSTR key, LPCTSTR value, LPCTSTR data)
{
HKEY hKey;
LONG ret;
DWORD size;
ret = RegCreateKeyEx(HKEY_CLASSES_ROOT, key, 0, NULL,
REG_OPTION_NON_VOLATILE, KEY_WRITE, NULL, &hKey, NULL);
if (ret != ERROR_SUCCESS) {
goto out;
}
if (data != NULL) {
size = strlen(data) + 1;
} else {
size = 0;
}
ret = RegSetValueEx(hKey, value, 0, REG_SZ, (LPBYTE)data, size);
RegCloseKey(hKey);
out:
if (ret != ERROR_SUCCESS) {
/* As we cannot printf within DllRegisterServer(), show a dialog. */
errmsg_dialog(ret, "Cannot add registry", key);
return FALSE;
}
return TRUE;
}
/* Register this dll as a VSS provider */
STDAPI DllRegisterServer(void)
{
COMInitializer initializer;
COMPointer<IVssAdmin> pVssAdmin;
HRESULT hr = E_FAIL;
char dllPath[MAX_PATH];
char key[256];
if (!g_hinstDll) {
errmsg_dialog(hr, "Module instance is not available");
goto out;
}
/* Add this module to registery */
sprintf(key, "CLSID\\%s", g_szClsid);
if (!CreateRegistryKey(key, NULL, g_szClsid)) {
goto out;
}
if (!GetModuleFileName(g_hinstDll, dllPath, sizeof(dllPath))) {
errmsg_dialog(GetLastError(), "GetModuleFileName failed");
goto out;
}
sprintf(key, "CLSID\\%s\\InprocServer32", g_szClsid);
if (!CreateRegistryKey(key, NULL, dllPath)) {
goto out;
}
if (!CreateRegistryKey(key, "ThreadingModel", "Apartment")) {
goto out;
}
sprintf(key, "CLSID\\%s\\ProgID", g_szClsid);
if (!CreateRegistryKey(key, NULL, g_szProgid)) {
goto out;
}
if (!CreateRegistryKey(g_szProgid, NULL, QGA_PROVIDER_NAME)) {
goto out;
}
sprintf(key, "%s\\CLSID", g_szProgid);
if (!CreateRegistryKey(key, NULL, g_szClsid)) {
goto out;
}
hr = CoCreateInstance(CLSID_VSSCoordinator, NULL, CLSCTX_ALL,
IID_IVssAdmin, (void **)pVssAdmin.replace());
if (FAILED(hr)) {
errmsg_dialog(hr, "CoCreateInstance(VSSCoordinator) failed");
goto out;
}
hr = pVssAdmin->RegisterProvider(g_gProviderId, CLSID_QGAVSSProvider,
const_cast<WCHAR*>(QGA_PROVIDER_LNAME),
VSS_PROV_SOFTWARE,
const_cast<WCHAR*>(QGA_PROVIDER_VERSION),
g_gProviderVersion);
if (FAILED(hr)) {
errmsg_dialog(hr, "RegisterProvider failed");
}
out:
if (FAILED(hr)) {
DllUnregisterServer();
}
return hr;
}
/* Unregister this VSS hardware provider from the system */
STDAPI DllUnregisterServer(void)
{
TCHAR key[256];
COMInitializer initializer;
COMPointer<IVssAdmin> pVssAdmin;
HRESULT hr = CoCreateInstance(CLSID_VSSCoordinator,
NULL, CLSCTX_ALL, IID_IVssAdmin,
(void **)pVssAdmin.replace());
if (SUCCEEDED(hr)) {
hr = pVssAdmin->UnregisterProvider(g_gProviderId);
} else {
errmsg(hr, "CoCreateInstance(VSSCoordinator) failed");
}
sprintf(key, "CLSID\\%s", g_szClsid);
SHDeleteKey(HKEY_CLASSES_ROOT, key);
SHDeleteKey(HKEY_CLASSES_ROOT, g_szProgid);
return S_OK; /* Uninstall should never fail */
}
/* Support function to convert ASCII string into BSTR (used in _bstr_t) */
namespace _com_util
{
BSTR WINAPI ConvertStringToBSTR(const char *ascii) {
int len = strlen(ascii);
BSTR bstr = SysAllocStringLen(NULL, len);
if (!bstr) {
return NULL;
}
if (mbstowcs(bstr, ascii, len) == (size_t)-1) {
fprintf(stderr, "Failed to convert string '%s' into BSTR", ascii);
bstr[0] = 0;
}
return bstr;
}
}
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