/* Copyright (c) 2005-2009 TrueCrypt Developers Association. All rights reserved. Governed by the TrueCrypt License 3.0 the full text of which is contained in the file License.txt included in TrueCrypt binary and source code distribution packages. */ #include <stdlib.h> #include <string.h> #include <sys/stat.h> #include <sys/types.h> #include "Tcdefs.h" #include "Keyfiles.h" #include "Crc.h" #include <io.h> #include "Dlgcode.h" #include "Language.h" #include "SecurityToken.h" #include "Common/resource.h" #include "Platform/Finally.h" #include "Platform/ForEach.h" using namespace VeraCrypt; #define stat _stat #define S_IFDIR _S_IFDIR #define snprintf _snprintf BOOL HiddenFilesPresentInKeyfilePath = FALSE; KeyFile *KeyFileAdd (KeyFile *firstKeyFile, KeyFile *keyFile) { KeyFile *kf = firstKeyFile; if (firstKeyFile != NULL) { while (kf->Next) kf = kf->Next; kf->Next = keyFile; } else firstKeyFile = keyFile; keyFile->Next = NULL; return firstKeyFile; } // Returns first keyfile, NULL if last keyfile was removed static KeyFile *KeyFileRemove (KeyFile *firstKeyFile, KeyFile *keyFile) { KeyFile *prevkf = NULL, *kf = firstKeyFile; if (firstKeyFile == NULL) return NULL; do { if (kf == keyFile) { if (prevkf == NULL) firstKeyFile = kf->Next; else prevkf->Next = kf->Next; burn (keyFile, sizeof(*keyFile)); // wipe free (keyFile); break; } prevkf = kf; } while (kf = kf->Next); return firstKeyFile; } void KeyFileRemoveAll (KeyFile **firstKeyFile) { KeyFile *kf = *firstKeyFile; while (kf != NULL) { KeyFile *d = kf; kf = kf->Next; burn (d, sizeof(*d)); // wipe free (d); } *firstKeyFile = NULL; } KeyFile *KeyFileClone (KeyFile *keyFile) { KeyFile *clone; if (keyFile == NULL) return NULL; clone = (KeyFile *) malloc (sizeof (KeyFile)); strcpy (clone->FileName, keyFile->FileName); clone->Next = NULL; return clone; } KeyFile *KeyFileCloneAll (KeyFile *firstKeyFile) { KeyFile *cloneFirstKeyFile = KeyFileClone (firstKeyFile); KeyFile *kf; if (firstKeyFile == NULL) return NULL; kf = firstKeyFile->Next; while (kf != NULL) { KeyFileAdd (cloneFirstKeyFile, KeyFileClone (kf)); kf = kf->Next; } return cloneFirstKeyFile; } static BOOL KeyFileProcess (unsigned __int8 *keyPool, KeyFile *keyFile) { FILE *f; unsigned __int8 buffer[64 * 1024]; unsigned __int32 crc = 0xffffffff; int writePos = 0; size_t bytesRead, totalRead = 0; int status = TRUE; HANDLE src; FILETIME ftCreationTime; FILETIME ftLastWriteTime; FILETIME ftLastAccessTime; BOOL bTimeStampValid = FALSE; /* Remember the last access time of the keyfile. It will be preserved in order to prevent an adversary from determining which file may have been used as keyfile. */ src = CreateFile (keyFile->FileName, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL); if (src != INVALID_HANDLE_VALUE) { if (GetFileTime ((HANDLE) src, &ftCreationTime, &ftLastAccessTime, &ftLastWriteTime)) bTimeStampValid = TRUE; } finally_do_arg (HANDLE, src, { if (finally_arg != INVALID_HANDLE_VALUE) CloseHandle (finally_arg); }); f = fopen (keyFile->FileName, "rb"); if (f == NULL) return FALSE; while ((bytesRead = fread (buffer, 1, sizeof (buffer), f)) > 0) { size_t i; if (ferror (f)) { status = FALSE; goto close; } for (i = 0; i < bytesRead; i++) { crc = UPDC32 (buffer[i], crc); keyPool[writePos++] += (unsigned __int8) (crc >> 24); keyPool[writePos++] += (unsigned __int8) (crc >> 16); keyPool[writePos++] += (unsigned __int8) (crc >> 8); keyPool[writePos++] += (unsigned __int8) crc; if (writePos >= KEYFILE_POOL_SIZE) writePos = 0; if (++totalRead >= KEYFILE_MAX_READ_LEN) goto close; } } if (ferror (f)) { status = FALSE; } else if (totalRead == 0) { status = FALSE; SetLastError (ERROR_HANDLE_EOF); } close: DWORD err = GetLastError(); fclose (f); if (bTimeStampValid && !IsFileOnReadOnlyFilesystem (keyFile->FileName)) { // Restore the keyfile timestamp SetFileTime (src, &ftCreationTime, &ftLastAccessTime, &ftLastWriteTime); } SetLastError (err); return status; } BOOL KeyFilesApply (Password *password, KeyFile *firstKeyFile) { BOOL status = TRUE; KeyFile kfSubStruct; KeyFile *kf; KeyFile *kfSub = &kfSubStruct; static unsigned __int8 keyPool [KEYFILE_POOL_SIZE]; size_t i; struct stat statStruct; char searchPath [TC_MAX_PATH*2]; struct _finddata_t fBuf; intptr_t searchHandle; HiddenFilesPresentInKeyfilePath = FALSE; if (firstKeyFile == NULL) return TRUE; VirtualLock (keyPool, sizeof (keyPool)); memset (keyPool, 0, sizeof (keyPool)); for (kf = firstKeyFile; kf != NULL; kf = kf->Next) { // Determine whether it's a security token path try { if (SecurityToken::IsKeyfilePathValid (SingleStringToWide (kf->FileName))) { // Apply security token keyfile vector <byte> keyfileData; SecurityToken::GetKeyfileData (SecurityTokenKeyfile (SingleStringToWide (kf->FileName)), keyfileData); if (keyfileData.empty()) { SetLastError (ERROR_HANDLE_EOF); handleWin32Error (MainDlg); Error ("ERR_PROCESS_KEYFILE"); status = FALSE; continue; } unsigned __int32 crc = 0xffffffff; int writePos = 0; size_t totalRead = 0; for (size_t i = 0; i < keyfileData.size(); i++) { crc = UPDC32 (keyfileData[i], crc); keyPool[writePos++] += (unsigned __int8) (crc >> 24); keyPool[writePos++] += (unsigned __int8) (crc >> 16); keyPool[writePos++] += (unsigned __int8) (crc >> 8); keyPool[writePos++] += (unsigned __int8) crc; if (writePos >= KEYFILE_POOL_SIZE) writePos = 0; if (++totalRead >= KEYFILE_MAX_READ_LEN) break; } burn (&keyfileData.front(), keyfileData.size()); continue; } } catch (Exception &e) { e.Show (NULL); return FALSE; } // Determine whether it's a path or a file if (stat (kf->FileName, &statStruct) != 0) { handleWin32Error (MainDlg); Error ("ERR_PROCESS_KEYFILE"); status = FALSE; continue; } if (statStruct.st_mode & S_IFDIR) // If it's a directory { /* Find and process all keyfiles in the directory */ int keyfileCount = 0; snprintf (searchPath, sizeof (searchPath), "%s\\*.*", kf->FileName); if ((searchHandle = _findfirst (searchPath, &fBuf)) == -1) { handleWin32Error (MainDlg); Error ("ERR_PROCESS_KEYFILE_PATH"); status = FALSE; continue; } do { WIN32_FILE_ATTRIBUTE_DATA fileAttributes; snprintf (kfSub->FileName, sizeof(kfSub->FileName), "%s%c%s", kf->FileName, '\\', fBuf.name ); // Determine whether it's a path or a file if (stat (kfSub->FileName, &statStruct) != 0) { handleWin32Error (MainDlg); Error ("ERR_PROCESS_KEYFILE"); status = FALSE; continue; } else if (statStruct.st_mode & S_IFDIR) // If it's a directory { // Prevent recursive folder scanning continue; } // Skip hidden files if (GetFileAttributesEx (kfSub->FileName, GetFileExInfoStandard, &fileAttributes) && (fileAttributes.dwFileAttributes & FILE_ATTRIBUTE_HIDDEN) != 0) { HiddenFilesPresentInKeyfilePath = TRUE; continue; } ++keyfileCount; // Apply keyfile to the pool if (!KeyFileProcess (keyPool, kfSub)) { handleWin32Error (MainDlg); Error ("ERR_PROCESS_KEYFILE"); status = FALSE; } } while (_findnext (searchHandle, &fBuf) != -1); _findclose (searchHandle); burn (&kfSubStruct, sizeof (kfSubStruct)); if (keyfileCount == 0) { ErrorDirect ((wstring (GetString ("ERR_KEYFILE_PATH_EMPTY")) + L"\n\n" + SingleStringToWide (kf->FileName)).c_str()); status = FALSE; } } // Apply keyfile to the pool else if (!KeyFileProcess (keyPool, kf)) { handleWin32Error (MainDlg); Error ("ERR_PROCESS_KEYFILE"); status = FALSE; } } /* Mix the keyfile pool contents into the password */ for (i = 0; i < sizeof (keyPool); i++) { if (i < password->Length) password->Text[i] += keyPool[i]; else password->Text[i] = keyPool[i]; } if (password->Length < (int)sizeof (keyPool)) password->Length = sizeof (keyPool); burn (keyPool, sizeof (keyPool)); return status; } static void LoadKeyList (HWND hwndDlg, KeyFile *firstKeyFile) { KeyFile *kf; LVITEM LvItem; int line = 0; HWND hList = GetDlgItem (hwndDlg, IDC_KEYLIST); ListView_DeleteAllItems (hList); EnableWindow (GetDlgItem (hwndDlg, IDC_KEYREMOVE), FALSE); EnableWindow (GetDlgItem (hwndDlg, IDC_KEYREMOVEALL), firstKeyFile != NULL); SetCheckBox (hwndDlg, IDC_KEYFILES_ENABLE, firstKeyFile != NULL); for (kf = firstKeyFile; kf != NULL; kf = kf->Next) { memset (&LvItem,0,sizeof(LvItem)); LvItem.mask = LVIF_TEXT|LVIF_PARAM; LvItem.iItem = line++; LvItem.iSubItem = 0; LvItem.pszText = kf->FileName; LvItem.lParam = (LPARAM) kf; SendMessage (hList, LVM_INSERTITEM, 0, (LPARAM)&LvItem); } } #if KEYFILE_POOL_SIZE % 4 != 0 #error KEYFILE_POOL_SIZE must be a multiple of 4 #endif BOOL CALLBACK KeyFilesDlgProc (HWND hwndDlg, UINT msg, WPARAM wParam, LPARAM lParam) { static KeyFilesDlgParam *param; static KeyFilesDlgParam origParam; WORD lw = LOWORD (wParam); switch (msg) { case WM_INITDIALOG: { LVCOLUMNW LvCol; HWND hList = GetDlgItem (hwndDlg, IDC_KEYLIST); param = (KeyFilesDlgParam *) lParam; origParam = *(KeyFilesDlgParam *) lParam; param->FirstKeyFile = KeyFileCloneAll (param->FirstKeyFile); LocalizeDialog (hwndDlg, "IDD_KEYFILES"); DragAcceptFiles (hwndDlg, TRUE); SendMessageW (hList,LVM_SETEXTENDEDLISTVIEWSTYLE,0, LVS_EX_FULLROWSELECT|LVS_EX_HEADERDRAGDROP ); memset (&LvCol,0,sizeof(LvCol)); LvCol.mask = LVCF_TEXT|LVCF_WIDTH|LVCF_SUBITEM|LVCF_FMT; LvCol.pszText = GetString ("KEYFILE"); LvCol.cx = CompensateXDPI (374); LvCol.fmt = LVCFMT_LEFT; SendMessageW (hList, LVM_INSERTCOLUMNW, 0, (LPARAM)&LvCol); LoadKeyList (hwndDlg, param->FirstKeyFile); SetCheckBox (hwndDlg, IDC_KEYFILES_ENABLE, param->EnableKeyFiles); SetWindowTextW(GetDlgItem(hwndDlg, IDT_KEYFILES_NOTE), GetString ("KEYFILES_NOTE")); ToHyperlink (hwndDlg, IDC_LINK_KEYFILES_INFO); } return 1; case WM_COMMAND: if (lw == IDC_KEYADD) { KeyFile *kf = (KeyFile *) malloc (sizeof (KeyFile)); if (SelectMultipleFiles (hwndDlg, "SELECT_KEYFILE", kf->FileName, bHistory)) { do { param->FirstKeyFile = KeyFileAdd (param->FirstKeyFile, kf); LoadKeyList (hwndDlg, param->FirstKeyFile); kf = (KeyFile *) malloc (sizeof (KeyFile)); } while (SelectMultipleFilesNext (kf->FileName)); } free (kf); return 1; } if (lw == IDC_ADD_KEYFILE_PATH) { KeyFile *kf = (KeyFile *) malloc (sizeof (KeyFile)); if (BrowseDirectories (hwndDlg,"SELECT_KEYFILE_PATH", kf->FileName)) { param->FirstKeyFile = KeyFileAdd (param->FirstKeyFile, kf); LoadKeyList (hwndDlg, param->FirstKeyFile); } else { free (kf); } return 1; } if (lw == IDC_TOKEN_FILES_ADD) { list <SecurityTokenKeyfilePath> selectedTokenKeyfiles; if (DialogBoxParamW (hInst, MAKEINTRESOURCEW (IDD_TOKEN_KEYFILES), hwndDlg, (DLGPROC) SecurityTokenKeyfileDlgProc, (LPARAM) &selectedTokenKeyfiles) == IDOK) { foreach (const SecurityTokenKeyfilePath &keyPath, selectedTokenKeyfiles) { KeyFile *kf = (KeyFile *) malloc (sizeof (KeyFile)); strcpy_s (kf->FileName, sizeof (kf->FileName), WideToSingleString (keyPath).c_str()); param->FirstKeyFile = KeyFileAdd (param->FirstKeyFile, kf); LoadKeyList (hwndDlg, param->FirstKeyFile); } } return 1; } if (lw == IDC_KEYREMOVE) { HWND list = GetDlgItem (hwndDlg, IDC_KEYLIST); LVITEM LvItem; memset (&LvItem, 0, sizeof(LvItem)); LvItem.mask = LVIF_PARAM; LvItem.iItem = -1; while (-1 != (LvItem.iItem = ListView_GetNextItem (list, LvItem.iItem, LVIS_SELECTED))) { ListView_GetItem (list, &LvItem); param->FirstKeyFile = KeyFileRemove (param->FirstKeyFile, (KeyFile *) LvItem.lParam); } LoadKeyList (hwndDlg, param->FirstKeyFile); return 1; } if (lw == IDC_KEYREMOVEALL) { KeyFileRemoveAll (¶m->FirstKeyFile); LoadKeyList (hwndDlg, NULL); return 1; } if (lw == IDC_GENERATE_KEYFILE) { DialogBoxParamW (hInst, MAKEINTRESOURCEW (IDD_KEYFILE_GENERATOR), hwndDlg, (DLGPROC) KeyfileGeneratorDlgProc, (LPARAM) 0); return 1; } if (lw == IDC_LINK_KEYFILES_INFO) { Applink ("keyfiles", TRUE, ""); } if (lw == IDOK) { param->EnableKeyFiles = IsButtonChecked (GetDlgItem (hwndDlg, IDC_KEYFILES_ENABLE)); EndDialog (hwndDlg, IDOK); return 1; } if (lw == IDCANCEL) { KeyFileRemoveAll (¶m->FirstKeyFile); *param = origParam; EndDialog (hwndDlg, IDCLOSE); return 1; } case WM_DROPFILES: { HDROP hdrop = (HDROP) wParam; int i = 0, count = DragQueryFile (hdrop, 0xFFFFFFFF, NULL, 0); while (count-- > 0) { KeyFile *kf = (KeyFile *) malloc (sizeof (KeyFile)); DragQueryFile (hdrop, i++, kf->FileName, sizeof (kf->FileName)); param->FirstKeyFile = KeyFileAdd (param->FirstKeyFile, kf); LoadKeyList (hwndDlg, param->FirstKeyFile); } DragFinish (hdrop); } return 1; case WM_NOTIFY: if (((LPNMHDR) lParam)->code == LVN_ITEMCHANGED) { EnableWindow (GetDlgItem (hwndDlg, IDC_KEYREMOVE), ListView_GetNextItem (GetDlgItem (hwndDlg, IDC_KEYLIST), -1, LVIS_SELECTED) != -1); return 1; } break; case WM_CLOSE: KeyFileRemoveAll (¶m->FirstKeyFile); *param = origParam; EndDialog (hwndDlg, IDCLOSE); return 1; break; } return 0; } #define IDM_KEYFILES_POPUP_ADD_FILES 9001 #define IDM_KEYFILES_POPUP_ADD_DIR 9002 #define IDM_KEYFILES_POPUP_ADD_TOKEN_FILES 9003 BOOL KeyfilesPopupMenu (HWND hwndDlg, POINT popupPosition, KeyFilesDlgParam *param) { HMENU popup = CreatePopupMenu (); int sel; BOOL status = FALSE; AppendMenuW (popup, MF_STRING, IDM_KEYFILES_POPUP_ADD_FILES, GetString ("IDC_KEYADD")); AppendMenuW (popup, MF_STRING, IDM_KEYFILES_POPUP_ADD_DIR, GetString ("IDC_ADD_KEYFILE_PATH")); AppendMenuW (popup, MF_STRING, IDM_KEYFILES_POPUP_ADD_TOKEN_FILES, GetString ("IDC_TOKEN_FILES_ADD")); sel = TrackPopupMenu (popup, TPM_RETURNCMD | TPM_LEFTBUTTON, popupPosition.x, popupPosition.y, 0, hwndDlg, NULL); switch (sel) { case IDM_KEYFILES_POPUP_ADD_FILES: { KeyFile *kf = (KeyFile *) malloc (sizeof (KeyFile)); if (SelectMultipleFiles (hwndDlg, "SELECT_KEYFILE", kf->FileName, bHistory)) { do { param->FirstKeyFile = KeyFileAdd (param->FirstKeyFile, kf); kf = (KeyFile *) malloc (sizeof (KeyFile)); } while (SelectMultipleFilesNext (kf->FileName)); param->EnableKeyFiles = TRUE; status = TRUE; } free (kf); } break; case IDM_KEYFILES_POPUP_ADD_DIR: { KeyFile *kf = (KeyFile *) malloc (sizeof (KeyFile)); if (BrowseDirectories (hwndDlg,"SELECT_KEYFILE_PATH", kf->FileName)) { param->FirstKeyFile = KeyFileAdd (param->FirstKeyFile, kf); param->EnableKeyFiles = TRUE; status = TRUE; } else { free (kf); } } break; case IDM_KEYFILES_POPUP_ADD_TOKEN_FILES: { list <SecurityTokenKeyfilePath> selectedTokenKeyfiles; if (DialogBoxParamW (hInst, MAKEINTRESOURCEW (IDD_TOKEN_KEYFILES), hwndDlg, (DLGPROC) SecurityTokenKeyfileDlgProc, (LPARAM) &selectedTokenKeyfiles) == IDOK) { foreach (const SecurityTokenKeyfilePath &keyPath, selectedTokenKeyfiles) { KeyFile *kf = (KeyFile *) malloc (sizeof (KeyFile)); strcpy_s (kf->FileName, sizeof (kf->FileName), WideToSingleString (keyPath).c_str()); param->FirstKeyFile = KeyFileAdd (param->FirstKeyFile, kf); param->EnableKeyFiles = TRUE; status = TRUE; } } } break; } DestroyMenu (popup); return status; }