// // chngpwd.cpp // // Copyright (c) Microsoft Corp, 1998 // // This file contains source code for testing protected storage's key // backup and recovery capabilities under a real world scenario, by creating // a local user account, performing a data protection operation, and then // change the pwd, then performing data unprotect, and comparing the data. // // History: // // Todds 8/15/98 Created // #include #include #include #include #include #include #include #include #define TERROR(msg) LogError(__FILE__, __LINE__, msg) #define TERRORVAL(msg, val) LogErrorVal(__FILE__, __LINE__, msg, val) #define TCOMMENT(msg) LogComment(msg) #define MyAlloc(cb) HeapAlloc(GetProcessHeap(), 0, cb) #define MyFree(pv) HeapFree(GetProcessHeap(), 0, pv) #define WSZ_BYTECOUNT(s) (2 * wcslen(s) + 2) #define CHECK_NULL(s) if (s == NULL) \ LogError(__FILE__, __LINE__, L"## CHECK_NULL ##") #define MAX_BLOBS 20 #define MAX_PROCESSES 200 #define MAX_SD 2048 #define BLOB_INCREMENT 0x4001 // 1 page + 1 byte... // // Error Logging Functions # defined as follows to include // Line and FILE macros: // // TERROR - LogError() // TERRORVAL - LogErrorVal() // // void LogError(LPSTR szFile, int iLine, LPWSTR wszMsg) { // // Event log or testutil logging later... // WCHAR buffer[512]; swprintf(buffer, L"ERROR Line: %i -> %s\n", iLine, wszMsg); OutputDebugStringW(buffer); wprintf(buffer); } void LogErrorVal(LPSTR szFile, int iLine, LPWSTR wszMsg, DWORD dwVal) { WCHAR buffer[256]; // this should be adequate. swprintf(buffer, L"%s Error:: %x", wszMsg, dwVal); LogError(szFile, iLine, buffer); } void LogComment(LPWSTR wszMsg) { // // Event log or testutil logging later... // WCHAR buffer[512]; OutputDebugStringW(wszMsg); wprintf(wszMsg); } void DumpBin(CRYPT_DATA_BLOB hash) { WCHAR buff[256], out[256]; ULONG cb; swprintf(out, L""); while (hash.cbData > 0) { cb = min(4, hash.cbData); hash.cbData -= cb; for (; cb > 0; cb--, hash.pbData++) { swprintf(buff, L"%02X", *hash.pbData); wcscat(out, buff); } wcscat(out, L" "); } wcscat(out, L"\n"); TCOMMENT(out); } // // SetSidOnAcl // BOOL SetSidOnAcl( PSID pSid, PACL pAclSource, PACL *pAclDestination, DWORD AccessMask, BYTE AceFlags, BOOL bAddSid ) { ACL_SIZE_INFORMATION AclInfo; DWORD dwNewAclSize, dwErr = S_OK; LPVOID pAce; DWORD AceCounter; BOOL bSuccess=FALSE; // assume this function will fail // // If we were given a NULL Acl, just provide a NULL Acl // if(pAclSource == NULL) { *pAclDestination = NULL; return TRUE; } if(!IsValidSid(pSid)) return FALSE; if(!GetAclInformation( pAclSource, &AclInfo, sizeof(ACL_SIZE_INFORMATION), AclSizeInformation )) return FALSE; // // compute size for new Acl, based on addition or subtraction of Ace // if(bAddSid) { dwNewAclSize=AclInfo.AclBytesInUse + sizeof(ACCESS_ALLOWED_ACE) + GetLengthSid(pSid) - sizeof(DWORD) ; } else { dwNewAclSize=AclInfo.AclBytesInUse - sizeof(ACCESS_ALLOWED_ACE) - GetLengthSid(pSid) + sizeof(DWORD) ; } *pAclDestination = (PACL)MyAlloc(dwNewAclSize); if(*pAclDestination == NULL) { TERRORVAL(L"Alloc failed!", E_OUTOFMEMORY); return FALSE; } // // initialize new Acl // if(!InitializeAcl( *pAclDestination, dwNewAclSize, ACL_REVISION )){ dwErr = GetLastError(); TERRORVAL(L"InitilizeAcl failed!", dwErr); goto ret; } // // if appropriate, add ace representing pSid // if(bAddSid) { PACCESS_ALLOWED_ACE pNewAce; if(!AddAccessAllowedAce( *pAclDestination, ACL_REVISION, AccessMask, pSid )) { dwErr = GetLastError(); TERRORVAL(L"AddAccessAllowedAce failed!", dwErr); goto ret; } // // get pointer to ace we just added, so we can change the AceFlags // if(!GetAce( *pAclDestination, 0, // this is the first ace in the Acl (void**) &pNewAce )){ dwErr = GetLastError(); TERRORVAL(L"GetAce failed!", dwErr); goto ret; } pNewAce->Header.AceFlags = AceFlags; } // // copy existing aces to new Acl // for(AceCounter = 0 ; AceCounter < AclInfo.AceCount ; AceCounter++) { // // fetch existing ace // if(!GetAce(pAclSource, AceCounter, &pAce)){ dwErr = GetLastError(); TERRORVAL(L"GetAce failed!", dwErr); goto ret; } // // check to see if we are removing the Ace // if(!bAddSid) { // // we only care about ACCESS_ALLOWED aces // if((((PACE_HEADER)pAce)->AceType) == ACCESS_ALLOWED_ACE_TYPE) { PSID pTempSid=(PSID)&((PACCESS_ALLOWED_ACE)pAce)->SidStart; // // if the Sid matches, skip adding this Sid // if(EqualSid(pSid, pTempSid)) continue; } } // // append ace to Acl // if(!AddAce( *pAclDestination, ACL_REVISION, MAXDWORD, // maintain Ace order pAce, ((PACE_HEADER)pAce)->AceSize )) { dwErr = GetLastError(); TERRORVAL(L"AddAccessAllowedAce failed!", dwErr); goto ret; } } bSuccess=TRUE; // indicate success ret: // // free memory if an error occurred // if(!bSuccess) { if(*pAclDestination != NULL) MyFree(*pAclDestination); } return bSuccess; } // // AddSIDToKernelObject() // // This function takes a given SID and dwAccess and adds it to a given token. // // ** Be sure to restore old kernel object // ** using call to GetKernelObjectSecurity() // BOOL AddSIDToKernelObjectDacl(PSID pSid, DWORD dwAccess, HANDLE OriginalToken, PSECURITY_DESCRIPTOR* ppSDOld) { PSECURITY_DESCRIPTOR pSD = NULL; SECURITY_DESCRIPTOR sdNew; DWORD cbByte = MAX_SD, cbNeeded = 0, dwErr = 0; PACL pOldDacl = NULL, pNewDacl = NULL; BOOL fDaclPresent, fDaclDefaulted, fRet = FALSE; pSD = (PSECURITY_DESCRIPTOR) MyAlloc(cbByte); if (NULL == pSD) { TERRORVAL(L"Alloc failed!", E_OUTOFMEMORY); return FALSE; } if (!InitializeSecurityDescriptor( &sdNew, SECURITY_DESCRIPTOR_REVISION )) { dwErr = GetLastError(); TERRORVAL(L"InitializeSecurityDescriptor failed!", dwErr); goto ret; } if (!GetKernelObjectSecurity( OriginalToken, DACL_SECURITY_INFORMATION, pSD, cbByte, &cbNeeded )) { dwErr = GetLastError(); if (cbNeeded > MAX_SD && dwErr == ERROR_MORE_DATA) { MyFree(pSD); pSD = NULL; pSD = (PSECURITY_DESCRIPTOR) MyAlloc(cbNeeded); if (NULL == pSD) { TERRORVAL(L"Alloc failed!", E_OUTOFMEMORY); dwErr = E_OUTOFMEMORY; goto ret; } dwErr = S_OK; if (!GetKernelObjectSecurity( OriginalToken, DACL_SECURITY_INFORMATION, pSD, cbNeeded, &cbNeeded )) { dwErr = GetLastError(); } } if (dwErr != S_OK) { TERRORVAL(L"GetKernelObjectSecurity failed!", dwErr); goto ret; } } if (!GetSecurityDescriptorDacl( pSD, &fDaclPresent, &pOldDacl, &fDaclDefaulted )) { dwErr = GetLastError(); TERRORVAL(L"GetSecurityDescriptorDacl failed!", dwErr); goto ret; } if (!SetSidOnAcl( pSid, pOldDacl, &pNewDacl, dwAccess, 0, TRUE )) { goto ret; } if (!SetSecurityDescriptorDacl( &sdNew, TRUE, pNewDacl, FALSE )) { dwErr = GetLastError(); TERRORVAL(L"SetSecurityDescriptorDacl failed!", dwErr); goto ret; } if (!SetKernelObjectSecurity( OriginalToken, DACL_SECURITY_INFORMATION, &sdNew )) { dwErr = GetLastError(); TERRORVAL(L"SetKernelObjectSecurity failed!", dwErr); goto ret; } *ppSDOld = pSD; fRet = TRUE; ret: if (NULL != pNewDacl) { MyFree(pNewDacl); } if (!fRet) { if (NULL != pSD) { MyFree(pSD); *ppSDOld = NULL; } } return fRet; } // // DataFree() // // Utility for freeing array of DATA_BLOB structs // void DataFree(DATA_BLOB* arDataBlob, BOOL fCryptAlloc) { if (arDataBlob == NULL) return; // not alloc'd for (DWORD i = 0; i < MAX_BLOBS;i++) { if (arDataBlob[i].pbData != NULL) { if (!fCryptAlloc) { MyFree(arDataBlob[i].pbData); } else { // Data member alloc'd by DataProtect call LocalFree(arDataBlob[i].pbData); } } } MyFree(arDataBlob); } BOOL SetPrivilege( HANDLE hToken, // token handle LPCTSTR Privilege, // Privilege to enable/disable BOOL bEnablePrivilege // to enable or disable privilege ) { TOKEN_PRIVILEGES tp; LUID luid; TOKEN_PRIVILEGES tpPrevious; DWORD cbPrevious=sizeof(TOKEN_PRIVILEGES); if(!LookupPrivilegeValue( NULL, Privilege, &luid )) return FALSE; // // first pass. get current privilege setting // tp.PrivilegeCount = 1; tp.Privileges[0].Luid = luid; tp.Privileges[0].Attributes = 0; AdjustTokenPrivileges( hToken, FALSE, &tp, sizeof(TOKEN_PRIVILEGES), &tpPrevious, &cbPrevious ); if (GetLastError() != ERROR_SUCCESS) return FALSE; // // second pass. set privilege based on previous setting // tpPrevious.PrivilegeCount = 1; tpPrevious.Privileges[0].Luid = luid; if(bEnablePrivilege) { tpPrevious.Privileges[0].Attributes |= (SE_PRIVILEGE_ENABLED); } else { tpPrevious.Privileges[0].Attributes ^= (SE_PRIVILEGE_ENABLED & tpPrevious.Privileges[0].Attributes); } AdjustTokenPrivileges( hToken, FALSE, &tpPrevious, cbPrevious, NULL, NULL ); if (GetLastError() != ERROR_SUCCESS) return FALSE; return TRUE; } BOOL SetCurrentPrivilege( LPCTSTR Privilege, // Privilege to enable/disable BOOL bEnablePrivilege // to enable or disable privilege ) { BOOL bSuccess=FALSE; // assume failure HANDLE hToken; if (!OpenThreadToken( GetCurrentThread(), TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES, FALSE, &hToken)){ if(!OpenProcessToken( GetCurrentProcess(), TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES, &hToken )) return FALSE; } if(SetPrivilege(hToken, Privilege, bEnablePrivilege)) bSuccess=TRUE; CloseHandle(hToken); return bSuccess; } // // GetUserSid // // This function takes a token, and returns the user SID from that token. // // Note: SID must be freed by MyFree() // hToken is optional... NULL means we'll grab it. // extern "C" BOOL GetUserSid(HANDLE hClientToken, PSID* ppSid, DWORD* lpcbSid) { DWORD cbUserInfo = 0; PTOKEN_USER pUserInfo = NULL; PUCHAR pnSubAuthorityCount = 0; DWORD cbSid = 0; BOOL fRet = FALSE; HANDLE hToken = hClientToken; *ppSid = NULL; if (NULL == hClientToken) { if (!OpenThreadToken( GetCurrentThread(), TOKEN_QUERY, FALSE, &hToken )) { // not impersonating, use process token... if (!OpenProcessToken( GetCurrentProcess(), TOKEN_QUERY, &hToken )) { TERRORVAL(L"OpenProcessToken failed!", GetLastError()); return FALSE; } } } // this will fail, usually w/ ERROR_INSUFFICIENT_BUFFER GetTokenInformation( hToken, TokenUser, NULL, 0, &cbUserInfo ); pUserInfo = (PTOKEN_USER) MyAlloc(cbUserInfo); if (NULL == pUserInfo) { TERRORVAL(L"ALLOC FAILURE!", E_OUTOFMEMORY); return FALSE; } if (!GetTokenInformation( hToken, TokenUser, pUserInfo, cbUserInfo, &cbUserInfo )) { TERRORVAL(L"GetTokenInformation failed!", GetLastError()); goto ret; } // // Now that we've got the SID AND ATTRIBUTES struct, get the SID lenght, // alloc room, and return *just the SID* // if (!IsValidSid(pUserInfo->User.Sid)) goto ret; pnSubAuthorityCount = GetSidSubAuthorityCount(pUserInfo->User.Sid); cbSid = GetSidLengthRequired(*pnSubAuthorityCount); *ppSid = (PSID) MyAlloc(cbSid); if (NULL == *ppSid ) { TERRORVAL(L"Alloc failed!", E_OUTOFMEMORY); goto ret; } if (!CopySid( cbSid, *ppSid, pUserInfo->User.Sid )) { TERRORVAL(L"CopySid failed!", GetLastError()); goto copyerr; } *lpcbSid = cbSid; // may be useful later on... fRet = TRUE; ret: if (NULL == hClientToken && NULL != hToken) { // supplied our own CloseHandle(hToken); } if (NULL != pUserInfo) { MyFree(pUserInfo); } return fRet; copyerr: if (NULL != *ppSid) { MyFree(*ppSid); *ppSid = NULL; } goto ret; } // // IsLocalSystem() // This function makes the determination if the given process token // is running as local system. // BOOL IsLocalSystem(HANDLE hToken) { PSID pLocalSid = NULL, pTokenSid = NULL; SID_IDENTIFIER_AUTHORITY IDAuthorityNT = SECURITY_NT_AUTHORITY; DWORD cbSid = 0; BOOL fRet = FALSE; if (!GetUserSid( hToken, &pTokenSid, &cbSid )) { goto ret; } if (!AllocateAndInitializeSid( &IDAuthorityNT, 1, SECURITY_LOCAL_SYSTEM_RID, 0,0,0,0,0,0,0, &pLocalSid )) { TERRORVAL(L"AllocateAndInitializeSid failed!", GetLastError()); goto ret; } if (EqualSid(pLocalSid, pTokenSid)) { fRet = TRUE; // got one! } ret: if (NULL != pTokenSid) { MyFree(pTokenSid); } if (NULL != pLocalSid) { FreeSid(pLocalSid); } return fRet; } // // GetLocalSystemToken() // // This function grabs a process token from a LOCAL SYSTEM process and uses it // to run as local system for the duration of the test // extern "C" DWORD GetLocalSystemToken(HANDLE* phRet) { HANDLE hProcess = NULL; HANDLE hPToken = NULL, hPTokenNew = NULL, hPDupToken = NULL; DWORD rgPIDs[MAX_PROCESSES], cbNeeded = 0, dwErr = S_OK, i = 0; DWORD cbrgPIDs = sizeof(DWORD) * MAX_PROCESSES; PSECURITY_DESCRIPTOR pSD = NULL; PSID pSid = NULL; DWORD cbSid = 0; BOOL fSet = FALSE; // SLOW BUFFERs BYTE rgByte[MAX_SD], rgByte2[MAX_SD]; DWORD cbByte = MAX_SD, cbByte2 = MAX_SD; *phRet = NULL; if(!SetCurrentPrivilege(SE_DEBUG_NAME, TRUE)) { TERROR(L"SetCurrentPrivilege (debug) failed!"); return E_FAIL; } if(!SetCurrentPrivilege(SE_TAKE_OWNERSHIP_NAME, TRUE)) { TERROR(L"SetCurrentPrivilege (to) failed!"); return E_FAIL; } if (!EnumProcesses( rgPIDs, cbrgPIDs, &cbNeeded )) { dwErr = GetLastError(); TERRORVAL(L"EnumProcesses failed!", dwErr); goto ret; } // // Get current user's sid for use in expanding SD. // if (!GetUserSid( NULL, &pSid, &cbSid )) { goto ret; } // // Walk processes until we find one that's running as // local system // for (i = 1; i < (cbNeeded / sizeof(DWORD)); i++) { hProcess = OpenProcess( PROCESS_ALL_ACCESS, FALSE, rgPIDs[i] ); if (NULL == hProcess) { dwErr = GetLastError(); TERRORVAL(L"OpenProcess failed!", dwErr); goto ret; } if (!OpenProcessToken( hProcess, READ_CONTROL | WRITE_DAC, &hPToken )) { dwErr = GetLastError(); TERRORVAL(L"OpenProcessToken failed!", dwErr); goto ret; } // // We've got a token, but we can't use it for // TOKEN_DUPLICATE access. So, instead, we'll go // ahead and whack the DACL on the object to grant us // this access, and get a new token. // **** BE SURE TO RESTORE hProcess to Original SD!!! **** // if (!AddSIDToKernelObjectDacl( pSid, TOKEN_DUPLICATE, hPToken, &pSD )) { goto ret; } fSet = TRUE; if (!OpenProcessToken( hProcess, TOKEN_DUPLICATE, &hPTokenNew )) { dwErr = GetLastError(); TERRORVAL(L"OpenProcessToken failed!", dwErr); goto ret; } // // Duplicate the token // if (!DuplicateTokenEx( hPTokenNew, TOKEN_ALL_ACCESS, NULL, SecurityImpersonation, TokenPrimary, &hPDupToken )) { dwErr = GetLastError(); TERRORVAL(L"DuplicateToken failed!", dwErr); goto ret; } if (IsLocalSystem(hPDupToken)) { *phRet = hPDupToken; break; // found a local system token } // Loop cleanup if (!SetKernelObjectSecurity( hPToken, DACL_SECURITY_INFORMATION, pSD )) { dwErr = GetLastError(); TERRORVAL(L"SetKernelObjectSecurity failed!", dwErr); goto ret; } fSet = FALSE; if (NULL != hPDupToken) { CloseHandle(hPDupToken); hPDupToken = NULL; } if (NULL != pSD) { MyFree(pSD); pSD = NULL; } if (NULL != hPToken) { CloseHandle(hPToken); hPToken = NULL; } if (NULL != hProcess) { CloseHandle(hProcess); hProcess = NULL; } } // ** FOR ** ret: //***** REMEMBER TO RESTORE ORIGINAL SD TO OBJECT***** if (fSet) { if (!SetKernelObjectSecurity( hPToken, DACL_SECURITY_INFORMATION, pSD )) { dwErr = GetLastError(); TERRORVAL(L"SetKernelObjectSecurity failed (cleanup)!", dwErr); } } if (NULL != pSid) { MyFree(pSid); } if (NULL != hPToken) { CloseHandle(hPToken); } if (NULL != pSD) { MyFree(pSD); } if (NULL != hProcess) { CloseHandle(hProcess); } return dwErr; }