1 /* 2 * QEMU Guest Agent win32 VSS Provider installer 3 * 4 * Copyright Hitachi Data Systems Corp. 2013 5 * 6 * Authors: 7 * Tomoki Sekiyama <tomoki.sekiyama@hds.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2 or later. 10 * See the COPYING file in the top-level directory. 11 */ 12 13 #include "qemu/osdep.h" 14 15 #include "vss-common.h" 16 #include <inc/win2003/vscoordint.h> 17 #include "install.h" 18 #include <wbemidl.h> 19 #include <comdef.h> 20 #include <comutil.h> 21 #include <sddl.h> 22 #include <winsvc.h> 23 24 #define BUFFER_SIZE 1024 25 26 extern HINSTANCE g_hinstDll; 27 28 const GUID CLSID_COMAdminCatalog = { 0xF618C514, 0xDFB8, 0x11d1, 29 {0xA2, 0xCF, 0x00, 0x80, 0x5F, 0xC7, 0x92, 0x35} }; 30 const GUID IID_ICOMAdminCatalog2 = { 0x790C6E0B, 0x9194, 0x4cc9, 31 {0x94, 0x26, 0xA4, 0x8A, 0x63, 0x18, 0x56, 0x96} }; 32 const GUID CLSID_WbemLocator = { 0x4590f811, 0x1d3a, 0x11d0, 33 {0x89, 0x1f, 0x00, 0xaa, 0x00, 0x4b, 0x2e, 0x24} }; 34 const GUID IID_IWbemLocator = { 0xdc12a687, 0x737f, 0x11cf, 35 {0x88, 0x4d, 0x00, 0xaa, 0x00, 0x4b, 0x2e, 0x24} }; 36 37 void errmsg(DWORD err, const char *text) 38 { 39 /* 40 * `text' contains function call statement when errmsg is called via chk(). 41 * To make error message more readable, we cut off the text after '('. 42 * If text doesn't contains '(', negative precision is given, which is 43 * treated as though it were missing. 44 */ 45 char *msg = NULL, *nul = strchr(text, '('); 46 int len = nul ? nul - text : -1; 47 48 FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | 49 FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, 50 NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), 51 (char *)&msg, 0, NULL); 52 fprintf(stderr, "%.*s. (Error: %lx) %s\n", len, text, err, msg); 53 LocalFree(msg); 54 } 55 56 static void errmsg_dialog(DWORD err, const char *text, const char *opt = "") 57 { 58 char *msg, buf[512]; 59 60 FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | 61 FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, 62 NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), 63 (char *)&msg, 0, NULL); 64 snprintf(buf, sizeof(buf), "%s%s. (Error: %lx) %s", text, opt, err, msg); 65 MessageBox(NULL, buf, "Error from " QGA_PROVIDER_NAME, MB_OK|MB_ICONERROR); 66 LocalFree(msg); 67 } 68 69 #define _chk(hr, status, msg, err_label) \ 70 do { \ 71 hr = (status); \ 72 if (FAILED(hr)) { \ 73 errmsg(hr, msg); \ 74 goto err_label; \ 75 } \ 76 } while (0) 77 78 #define chk(status) _chk(hr, status, "Failed to " #status, out) 79 80 #if !defined(__MINGW64_VERSION_MAJOR) || !defined(__MINGW64_VERSION_MINOR) || \ 81 __MINGW64_VERSION_MAJOR * 100 + __MINGW64_VERSION_MINOR < 301 82 void __stdcall _com_issue_error(HRESULT hr) 83 { 84 errmsg(hr, "Unexpected error in COM"); 85 } 86 #endif 87 88 template<class T> 89 HRESULT put_Value(ICatalogObject *pObj, LPCWSTR name, T val) 90 { 91 return pObj->put_Value(_bstr_t(name), _variant_t(val)); 92 } 93 94 /* Lookup Administrators group name from winmgmt */ 95 static HRESULT GetAdminName(_bstr_t *name) 96 { 97 HRESULT hr; 98 COMPointer<IWbemLocator> pLoc; 99 COMPointer<IWbemServices> pSvc; 100 COMPointer<IEnumWbemClassObject> pEnum; 101 COMPointer<IWbemClassObject> pWobj; 102 ULONG returned; 103 _variant_t var; 104 105 chk(CoCreateInstance(CLSID_WbemLocator, NULL, CLSCTX_INPROC_SERVER, 106 IID_IWbemLocator, (LPVOID *)pLoc.replace())); 107 chk(pLoc->ConnectServer(_bstr_t(L"ROOT\\CIMV2"), NULL, NULL, NULL, 108 0, 0, 0, pSvc.replace())); 109 chk(CoSetProxyBlanket(pSvc, RPC_C_AUTHN_WINNT, RPC_C_AUTHZ_NONE, 110 NULL, RPC_C_AUTHN_LEVEL_CALL, 111 RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE)); 112 chk(pSvc->ExecQuery(_bstr_t(L"WQL"), 113 _bstr_t(L"select * from Win32_Account where " 114 "SID='S-1-5-32-544' and localAccount=TRUE"), 115 WBEM_FLAG_RETURN_IMMEDIATELY | WBEM_FLAG_FORWARD_ONLY, 116 NULL, pEnum.replace())); 117 if (!pEnum) { 118 hr = E_FAIL; 119 errmsg(hr, "Failed to query for Administrators"); 120 goto out; 121 } 122 chk(pEnum->Next(WBEM_INFINITE, 1, pWobj.replace(), &returned)); 123 if (returned == 0) { 124 hr = E_FAIL; 125 errmsg(hr, "No Administrators found"); 126 goto out; 127 } 128 129 chk(pWobj->Get(_bstr_t(L"Name"), 0, &var, 0, 0)); 130 try { 131 *name = var; 132 } catch(...) { 133 hr = E_FAIL; 134 errmsg(hr, "Failed to get name of Administrators"); 135 goto out; 136 } 137 138 out: 139 return hr; 140 } 141 142 /* Acquire group or user name by SID */ 143 static HRESULT getNameByStringSID( 144 const wchar_t *sid, LPWSTR buffer, LPDWORD bufferLen) 145 { 146 HRESULT hr = S_OK; 147 PSID psid = NULL; 148 SID_NAME_USE groupType; 149 DWORD domainNameLen = BUFFER_SIZE; 150 wchar_t domainName[BUFFER_SIZE]; 151 152 if (!ConvertStringSidToSidW(sid, &psid)) { 153 hr = HRESULT_FROM_WIN32(GetLastError()); 154 goto out; 155 } 156 if (!LookupAccountSidW(NULL, psid, buffer, bufferLen, 157 domainName, &domainNameLen, &groupType)) { 158 hr = HRESULT_FROM_WIN32(GetLastError()); 159 /* Fall through and free psid */ 160 } 161 162 LocalFree(psid); 163 164 out: 165 return hr; 166 } 167 168 /* Find and iterate QGA VSS provider in COM+ Application Catalog */ 169 static HRESULT QGAProviderFind( 170 HRESULT (*found)(ICatalogCollection *, int, void *), void *arg) 171 { 172 HRESULT hr; 173 COMInitializer initializer; 174 COMPointer<IUnknown> pUnknown; 175 COMPointer<ICOMAdminCatalog2> pCatalog; 176 COMPointer<ICatalogCollection> pColl; 177 COMPointer<ICatalogObject> pObj; 178 _variant_t var; 179 long i, n; 180 181 chk(CoCreateInstance(CLSID_COMAdminCatalog, NULL, CLSCTX_INPROC_SERVER, 182 IID_IUnknown, (void **)pUnknown.replace())); 183 chk(pUnknown->QueryInterface(IID_ICOMAdminCatalog2, 184 (void **)pCatalog.replace())); 185 chk(pCatalog->GetCollection(_bstr_t(L"Applications"), 186 (IDispatch **)pColl.replace())); 187 chk(pColl->Populate()); 188 189 chk(pColl->get_Count(&n)); 190 for (i = n - 1; i >= 0; i--) { 191 chk(pColl->get_Item(i, (IDispatch **)pObj.replace())); 192 chk(pObj->get_Value(_bstr_t(L"Name"), &var)); 193 if (var == _variant_t(QGA_PROVIDER_LNAME)) { 194 if (FAILED(found(pColl, i, arg))) { 195 goto out; 196 } 197 } 198 } 199 chk(pColl->SaveChanges(&n)); 200 201 out: 202 return hr; 203 } 204 205 /* Count QGA VSS provider in COM+ Application Catalog */ 206 static HRESULT QGAProviderCount(ICatalogCollection *coll, int i, void *arg) 207 { 208 (*(int *)arg)++; 209 return S_OK; 210 } 211 212 /* Remove QGA VSS provider from COM+ Application Catalog Collection */ 213 static HRESULT QGAProviderRemove(ICatalogCollection *coll, int i, void *arg) 214 { 215 HRESULT hr; 216 217 fprintf(stderr, "Removing COM+ Application: %s\n", QGA_PROVIDER_NAME); 218 chk(coll->Remove(i)); 219 out: 220 return hr; 221 } 222 223 /* Unregister this module from COM+ Applications Catalog */ 224 STDAPI COMUnregister(void) 225 { 226 HRESULT hr; 227 228 DllUnregisterServer(); 229 chk(QGAProviderFind(QGAProviderRemove, NULL)); 230 out: 231 return hr; 232 } 233 234 /* Register this module to COM+ Applications Catalog */ 235 STDAPI COMRegister(void) 236 { 237 HRESULT hr; 238 COMInitializer initializer; 239 COMPointer<IUnknown> pUnknown; 240 COMPointer<ICOMAdminCatalog2> pCatalog; 241 COMPointer<ICatalogCollection> pApps, pRoles, pUsersInRole; 242 COMPointer<ICatalogObject> pObj; 243 long n; 244 _bstr_t name; 245 _variant_t key; 246 CHAR dllPath[MAX_PATH], tlbPath[MAX_PATH]; 247 bool unregisterOnFailure = false; 248 int count = 0; 249 DWORD bufferLen = BUFFER_SIZE; 250 wchar_t buffer[BUFFER_SIZE]; 251 const wchar_t *administratorsGroupSID = L"S-1-5-32-544"; 252 const wchar_t *systemUserSID = L"S-1-5-18"; 253 254 if (!g_hinstDll) { 255 errmsg(E_FAIL, "Failed to initialize DLL"); 256 return E_FAIL; 257 } 258 259 chk(QGAProviderFind(QGAProviderCount, (void *)&count)); 260 if (count) { 261 errmsg(E_ABORT, "QGA VSS Provider is already installed"); 262 return E_ABORT; 263 } 264 265 chk(CoCreateInstance(CLSID_COMAdminCatalog, NULL, CLSCTX_INPROC_SERVER, 266 IID_IUnknown, (void **)pUnknown.replace())); 267 chk(pUnknown->QueryInterface(IID_ICOMAdminCatalog2, 268 (void **)pCatalog.replace())); 269 270 /* Install COM+ Component */ 271 272 chk(pCatalog->GetCollection(_bstr_t(L"Applications"), 273 (IDispatch **)pApps.replace())); 274 chk(pApps->Populate()); 275 chk(pApps->Add((IDispatch **)&pObj)); 276 chk(put_Value(pObj, L"Name", QGA_PROVIDER_LNAME)); 277 chk(put_Value(pObj, L"Description", QGA_PROVIDER_LNAME)); 278 chk(put_Value(pObj, L"ApplicationAccessChecksEnabled", true)); 279 chk(put_Value(pObj, L"Authentication", short(6))); 280 chk(put_Value(pObj, L"AuthenticationCapability", short(2))); 281 chk(put_Value(pObj, L"ImpersonationLevel", short(2))); 282 chk(pApps->SaveChanges(&n)); 283 284 /* The app should be deleted if something fails after SaveChanges */ 285 unregisterOnFailure = true; 286 287 chk(pObj->get_Key(&key)); 288 289 if (!GetModuleFileName(g_hinstDll, dllPath, sizeof(dllPath))) { 290 hr = HRESULT_FROM_WIN32(GetLastError()); 291 errmsg(hr, "GetModuleFileName failed"); 292 goto out; 293 } 294 n = strlen(dllPath); 295 if (n < 3) { 296 hr = E_FAIL; 297 errmsg(hr, "Failed to lookup dll"); 298 goto out; 299 } 300 strcpy(tlbPath, dllPath); 301 strcpy(tlbPath+n-3, "tlb"); 302 fprintf(stderr, "Registering " QGA_PROVIDER_NAME ":\n"); 303 fprintf(stderr, " %s\n", dllPath); 304 fprintf(stderr, " %s\n", tlbPath); 305 if (!PathFileExists(tlbPath)) { 306 hr = HRESULT_FROM_WIN32(ERROR_FILE_NOT_FOUND); 307 errmsg(hr, "Failed to lookup tlb"); 308 goto out; 309 } 310 311 chk(pCatalog->CreateServiceForApplication( 312 _bstr_t(QGA_PROVIDER_LNAME), _bstr_t(QGA_PROVIDER_LNAME), 313 _bstr_t(L"SERVICE_DEMAND_START"), _bstr_t(L"SERVICE_ERROR_NORMAL"), 314 _bstr_t(L""), _bstr_t(L".\\localsystem"), _bstr_t(L""), FALSE)); 315 chk(pCatalog->InstallComponent(_bstr_t(QGA_PROVIDER_LNAME), 316 _bstr_t(dllPath), _bstr_t(tlbPath), 317 _bstr_t(""))); 318 319 /* Setup roles of the applicaion */ 320 321 chk(getNameByStringSID(administratorsGroupSID, buffer, &bufferLen)); 322 chk(pApps->GetCollection(_bstr_t(L"Roles"), key, 323 (IDispatch **)pRoles.replace())); 324 chk(pRoles->Populate()); 325 chk(pRoles->Add((IDispatch **)pObj.replace())); 326 chk(put_Value(pObj, L"Name", buffer)); 327 chk(put_Value(pObj, L"Description", L"Administrators group")); 328 chk(pRoles->SaveChanges(&n)); 329 chk(pObj->get_Key(&key)); 330 331 /* Setup users in the role */ 332 333 chk(pRoles->GetCollection(_bstr_t(L"UsersInRole"), key, 334 (IDispatch **)pUsersInRole.replace())); 335 chk(pUsersInRole->Populate()); 336 337 chk(pUsersInRole->Add((IDispatch **)pObj.replace())); 338 chk(GetAdminName(&name)); 339 chk(put_Value(pObj, L"User", _bstr_t(".\\") + name)); 340 341 bufferLen = BUFFER_SIZE; 342 chk(getNameByStringSID(systemUserSID, buffer, &bufferLen)); 343 chk(pUsersInRole->Add((IDispatch **)pObj.replace())); 344 chk(put_Value(pObj, L"User", buffer)); 345 chk(pUsersInRole->SaveChanges(&n)); 346 347 out: 348 if (unregisterOnFailure && FAILED(hr)) { 349 COMUnregister(); 350 } 351 352 return hr; 353 } 354 355 356 static BOOL CreateRegistryKey(LPCTSTR key, LPCTSTR value, LPCTSTR data) 357 { 358 HKEY hKey; 359 LONG ret; 360 DWORD size; 361 362 ret = RegCreateKeyEx(HKEY_CLASSES_ROOT, key, 0, NULL, 363 REG_OPTION_NON_VOLATILE, KEY_WRITE, NULL, &hKey, NULL); 364 if (ret != ERROR_SUCCESS) { 365 goto out; 366 } 367 368 if (data != NULL) { 369 size = strlen(data) + 1; 370 } else { 371 size = 0; 372 } 373 374 ret = RegSetValueEx(hKey, value, 0, REG_SZ, (LPBYTE)data, size); 375 RegCloseKey(hKey); 376 377 out: 378 if (ret != ERROR_SUCCESS) { 379 /* As we cannot printf within DllRegisterServer(), show a dialog. */ 380 errmsg_dialog(ret, "Cannot add registry", key); 381 return FALSE; 382 } 383 return TRUE; 384 } 385 386 /* Register this dll as a VSS provider */ 387 STDAPI DllRegisterServer(void) 388 { 389 COMInitializer initializer; 390 COMPointer<IVssAdmin> pVssAdmin; 391 HRESULT hr = E_FAIL; 392 char dllPath[MAX_PATH]; 393 char key[256]; 394 395 if (!g_hinstDll) { 396 errmsg_dialog(hr, "Module instance is not available"); 397 goto out; 398 } 399 400 /* Add this module to registery */ 401 402 sprintf(key, "CLSID\\%s", g_szClsid); 403 if (!CreateRegistryKey(key, NULL, g_szClsid)) { 404 goto out; 405 } 406 407 if (!GetModuleFileName(g_hinstDll, dllPath, sizeof(dllPath))) { 408 errmsg_dialog(GetLastError(), "GetModuleFileName failed"); 409 goto out; 410 } 411 412 sprintf(key, "CLSID\\%s\\InprocServer32", g_szClsid); 413 if (!CreateRegistryKey(key, NULL, dllPath)) { 414 goto out; 415 } 416 417 if (!CreateRegistryKey(key, "ThreadingModel", "Apartment")) { 418 goto out; 419 } 420 421 sprintf(key, "CLSID\\%s\\ProgID", g_szClsid); 422 if (!CreateRegistryKey(key, NULL, g_szProgid)) { 423 goto out; 424 } 425 426 if (!CreateRegistryKey(g_szProgid, NULL, QGA_PROVIDER_NAME)) { 427 goto out; 428 } 429 430 sprintf(key, "%s\\CLSID", g_szProgid); 431 if (!CreateRegistryKey(key, NULL, g_szClsid)) { 432 goto out; 433 } 434 435 hr = CoCreateInstance(CLSID_VSSCoordinator, NULL, CLSCTX_ALL, 436 IID_IVssAdmin, (void **)pVssAdmin.replace()); 437 if (FAILED(hr)) { 438 errmsg_dialog(hr, "CoCreateInstance(VSSCoordinator) failed"); 439 goto out; 440 } 441 442 hr = pVssAdmin->RegisterProvider(g_gProviderId, CLSID_QGAVSSProvider, 443 const_cast<WCHAR*>(QGA_PROVIDER_LNAME), 444 VSS_PROV_SOFTWARE, 445 const_cast<WCHAR*>(QGA_PROVIDER_VERSION), 446 g_gProviderVersion); 447 if (hr == (long int) VSS_E_PROVIDER_ALREADY_REGISTERED) { 448 DllUnregisterServer(); 449 hr = pVssAdmin->RegisterProvider(g_gProviderId, CLSID_QGAVSSProvider, 450 const_cast<WCHAR * > 451 (QGA_PROVIDER_LNAME), 452 VSS_PROV_SOFTWARE, 453 const_cast<WCHAR * > 454 (QGA_PROVIDER_VERSION), 455 g_gProviderVersion); 456 } 457 458 if (FAILED(hr)) { 459 errmsg_dialog(hr, "RegisterProvider failed"); 460 } 461 462 out: 463 if (FAILED(hr)) { 464 DllUnregisterServer(); 465 } 466 467 return hr; 468 } 469 470 /* Unregister this VSS hardware provider from the system */ 471 STDAPI DllUnregisterServer(void) 472 { 473 TCHAR key[256]; 474 COMInitializer initializer; 475 COMPointer<IVssAdmin> pVssAdmin; 476 477 HRESULT hr = CoCreateInstance(CLSID_VSSCoordinator, 478 NULL, CLSCTX_ALL, IID_IVssAdmin, 479 (void **)pVssAdmin.replace()); 480 if (SUCCEEDED(hr)) { 481 hr = pVssAdmin->UnregisterProvider(g_gProviderId); 482 } else { 483 errmsg(hr, "CoCreateInstance(VSSCoordinator) failed"); 484 } 485 486 sprintf(key, "CLSID\\%s", g_szClsid); 487 SHDeleteKey(HKEY_CLASSES_ROOT, key); 488 SHDeleteKey(HKEY_CLASSES_ROOT, g_szProgid); 489 490 return S_OK; /* Uninstall should never fail */ 491 } 492 493 494 /* Support function to convert ASCII string into BSTR (used in _bstr_t) */ 495 namespace _com_util 496 { 497 BSTR WINAPI ConvertStringToBSTR(const char *ascii) { 498 int len = strlen(ascii); 499 BSTR bstr = SysAllocStringLen(NULL, len); 500 501 if (!bstr) { 502 return NULL; 503 } 504 505 if (mbstowcs(bstr, ascii, len) == (size_t)-1) { 506 fprintf(stderr, "Failed to convert string '%s' into BSTR", ascii); 507 bstr[0] = 0; 508 } 509 return bstr; 510 } 511 } 512 513 /* Stop QGA VSS provider service using Winsvc API */ 514 STDAPI StopService(void) 515 { 516 HRESULT hr; 517 SC_HANDLE manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS); 518 SC_HANDLE service = NULL; 519 520 if (!manager) { 521 errmsg(E_FAIL, "Failed to open service manager"); 522 hr = E_FAIL; 523 goto out; 524 } 525 service = OpenService(manager, QGA_PROVIDER_NAME, SC_MANAGER_ALL_ACCESS); 526 527 if (!service) { 528 errmsg(E_FAIL, "Failed to open service"); 529 hr = E_FAIL; 530 goto out; 531 } 532 if (!(ControlService(service, SERVICE_CONTROL_STOP, NULL))) { 533 errmsg(E_FAIL, "Failed to stop service"); 534 hr = E_FAIL; 535 } 536 537 out: 538 CloseServiceHandle(service); 539 CloseServiceHandle(manager); 540 return hr; 541 } 542