Windows: Support machines without "EFI\Boot" folder for EFI system encryption (e.g. Windows LTSB). Compatibility enhancements for EFI system encryption.

author: Mounir IDRASSI <mounir.idrassi@idrix.fr> 2018-05-02 19:59:50 +0200
committer: Mounir IDRASSI <mounir.idrassi@idrix.fr> 2018-05-03 08:25:22 +0200
commit: 98ff65045e7b6f6cda3bec644b5da4fd61bdf57a (patch)
tree: fb9f05fd240ec7439c512a0553599028283db0bc /src/Common
parent: 143d6c1dde328c051200e754248906e145606b8a (diff)
download: VeraCrypt-98ff65045e7b6f6cda3bec644b5da4fd61bdf57a.tar.gz
VeraCrypt-98ff65045e7b6f6cda3bec644b5da4fd61bdf57a.zip
4 files changed, 127 insertions, 71 deletions
diff --git a/src/Common/BootEncryption.cpp b/src/Common/BootEncryption.cpp
index c4fe4c79..d00629c0 100644
--- a/src/Common/BootEncryption.cpp
+++ b/src/Common/BootEncryption.cpp
@@ -1024,7 +1024,7 @@ namespace VeraCrypt
 
 	static EfiBoot EfiBootInst;
 
-	BootEncryption::BootEncryption (HWND parent)
+	BootEncryption::BootEncryption (HWND parent, bool postOOBE)
 		: DriveConfigValid (false),
 		ParentWindow (parent),
 		RealSystemDriveSizeValid (false),
@@ -1034,7 +1034,8 @@ namespace VeraCrypt
 		RescueVolumeHeaderValid (false),
 		SelectedEncryptionAlgorithmId (0),
 		SelectedPrfAlgorithmId (0),
-		VolumeHeaderValid (false)
+		VolumeHeaderValid (false),
+		PostOOBEMode (postOOBE)
 	{
       HiddenOSCandidatePartition.IsGPT = FALSE;
       HiddenOSCandidatePartition.Number = (size_t) -1;
@@ -3088,78 +3089,106 @@ namespace VeraCrypt
 			{
 				// Save modules
 				bool bAlreadyExist;
-				unsigned __int64 loaderSize = 0;
-				bool bModifiedMsBoot = false;
 
-				if (preserveUserConfig && !EfiBootInst.FileExists (L"\\EFI\\Microsoft\\Boot\\bootmgfw_ms.vc"))
+				if (preserveUserConfig)
 				{
+					bool bModifiedMsBoot = true;
+					const char* g_szMsBootString = "bootmgfw.pdb";
+					unsigned __int64 loaderSize = 0;
 					EfiBootInst.GetFileSize(L"\\EFI\\Microsoft\\Boot\\bootmgfw.efi", loaderSize);
 
-					// DcsBoot.efi is always smaller than 32KB
-					if (loaderSize < 32768)
+					if (EfiBootInst.FileExists (L"\\EFI\\Microsoft\\Boot\\bootmgfw_ms.vc"))
 					{
-						std::vector<byte> bootLoaderBuf ((size_t) loaderSize);
+						if (loaderSize > 32768)
+						{
+							std::vector<byte> bootLoaderBuf ((size_t) loaderSize);
 
-						EfiBootInst.ReadFile(L"\\EFI\\Microsoft\\Boot\\bootmgfw.efi", &bootLoaderBuf[0], (DWORD) loaderSize);
+							EfiBootInst.ReadFile(L"\\EFI\\Microsoft\\Boot\\bootmgfw.efi", &bootLoaderBuf[0], (DWORD) loaderSize);
 
-						// Prevent VeraCrypt EFI loader from being backed up
-						for (size_t i = 0; i < (size_t) loaderSize - (wcslen (_T(TC_APP_NAME)) * 2); ++i)
-						{
-							if (memcmp (&bootLoaderBuf[i], _T(TC_APP_NAME), wcslen (_T(TC_APP_NAME)) * 2) == 0)
+							// look for bootmgfw.efi identifiant string
+							if (BufferHasPattern (bootLoaderBuf.data (), (size_t) loaderSize, g_szMsBootString, strlen (g_szMsBootString)))
 							{
-								bModifiedMsBoot = true;
-								break;
+								bModifiedMsBoot = false;
+								// replace the backup with this version
+								EfiBootInst.RenameFile (L"\\EFI\\Microsoft\\Boot\\bootmgfw.efi", L"\\EFI\\Microsoft\\Boot\\bootmgfw_ms.vc", TRUE);
 							}
 						}
 					}
-
-					if (!bModifiedMsBoot)
-					{
-						EfiBootInst.RenameFile (L"\\EFI\\Microsoft\\Boot\\bootmgfw.efi", L"\\EFI\\Microsoft\\Boot\\bootmgfw_ms.vc", FALSE);					
-					}
 					else
-					{
-						bool bFound = false;
-						EfiBootConf conf;
-						if (EfiBootInst.ReadConfig (L"\\EFI\\VeraCrypt\\DcsProp", conf) && strlen (conf.actionSuccessValue.c_str()))
+					{						
+						// DcsBoot.efi is always smaller than 32KB
+						if (loaderSize > 32768)
 						{
-							string actionValue = conf.actionSuccessValue;
-							std::transform(actionValue.begin(), actionValue.end(), actionValue.begin(), ::tolower);
+							std::vector<byte> bootLoaderBuf ((size_t) loaderSize);
 
-							if (strstr (actionValue.c_str(), "postexec") && strstr (actionValue.c_str(), "file("))
+							EfiBootInst.ReadFile(L"\\EFI\\Microsoft\\Boot\\bootmgfw.efi", &bootLoaderBuf[0], (DWORD) loaderSize);
+
+							// look for bootmgfw.efi identifiant string
+							if (BufferHasPattern (bootLoaderBuf.data (), (size_t) loaderSize, g_szMsBootString, strlen (g_szMsBootString)))
+								bModifiedMsBoot = false;
+						}
+
+						if (!bModifiedMsBoot)
+						{
+							EfiBootInst.RenameFile (L"\\EFI\\Microsoft\\Boot\\bootmgfw.efi", L"\\EFI\\Microsoft\\Boot\\bootmgfw_ms.vc", TRUE);
+						}
+						else
+						{
+							bool bFound = false;
+							EfiBootConf conf;
+							if (EfiBootInst.ReadConfig (L"\\EFI\\VeraCrypt\\DcsProp", conf) && strlen (conf.actionSuccessValue.c_str()))
 							{
-								char c;
-								const char* ptr = strstr (actionValue.c_str(), "file(");
-								ptr += 5;
-								wstring loaderPath = L"\\";
-								while ((c = *ptr))
+								string actionValue = conf.actionSuccessValue;
+								std::transform(actionValue.begin(), actionValue.end(), actionValue.begin(), ::tolower);
+
+								if (strstr (actionValue.c_str(), "postexec") && strstr (actionValue.c_str(), "file("))
 								{
-									if (c == ')' || c == ' ')
-										break;
-									loaderPath += (wchar_t) c;
-									ptr++;
+									char c;
+									const char* ptr = strstr (actionValue.c_str(), "file(");
+									ptr += 5;
+									wstring loaderPath = L"\\";
+									while ((c = *ptr))
+									{
+										if (c == ')' || c == ' ')
+											break;
+										loaderPath += (wchar_t) c;
+										ptr++;
+									}
+									bFound = true;
+									EfiBootInst.RenameFile(loaderPath.c_str(), L"\\EFI\\Microsoft\\Boot\\bootmgfw_ms.vc", TRUE);
 								}
-								bFound = true;
-								EfiBootInst.RenameFile(loaderPath.c_str(), L"\\EFI\\Microsoft\\Boot\\bootmgfw.efi", TRUE);
 							}
+
+							if (!bFound)
+								throw ErrorException ("WINDOWS_EFI_BOOT_LOADER_MISSING", SRC_POS);
 						}
+					}
 
-						if (!bFound)
-							throw ErrorException ("WINDOWS_EFI_BOOT_LOADER_MISSING", SRC_POS);
+					if (PostOOBEMode)
+					{
+						// check if bootmgfw.efi has been set again to Microsoft version
+						// if yes, replace it with our bootloader after it was copied to bootmgfw_ms.vc
+						if (!bModifiedMsBoot)
+							EfiBootInst.CopyFile (L"\\EFI\\VeraCrypt\\DcsBoot.efi", L"\\EFI\\Microsoft\\Boot\\bootmgfw.efi");
+						return;
 					}
 				}
 
+				const wchar_t * szStdEfiBootloader = Is64BitOs()? L"\\EFI\\Boot\\bootx64.efi": L"\\EFI\\Boot\\bootia32.efi";
+
 				EfiBootInst.MkDir(L"\\EFI\\VeraCrypt", bAlreadyExist);
 				EfiBootInst.SaveFile(L"\\EFI\\VeraCrypt\\DcsBoot.efi", dcsBootImg, sizeDcsBoot);
-				EfiBootInst.SaveFile(Is64BitOs()? L"\\EFI\\Boot\\bootx64.efi": L"\\EFI\\Boot\\bootia32.efi", dcsBootImg, sizeDcsBoot);
 				EfiBootInst.SaveFile(L"\\EFI\\VeraCrypt\\DcsInt.dcs", dcsIntImg, sizeDcsInt);
 				EfiBootInst.SaveFile(L"\\EFI\\VeraCrypt\\DcsCfg.dcs", dcsCfgImg, sizeDcsCfg);
 				EfiBootInst.SaveFile(L"\\EFI\\VeraCrypt\\LegacySpeaker.dcs", LegacySpeakerImg, sizeLegacySpeaker);
 				EfiBootInst.SaveFile(L"\\EFI\\VeraCrypt\\DcsBml.dcs", BootMenuLockerImg, sizeBootMenuLocker);
 				EfiBootInst.SaveFile(L"\\EFI\\VeraCrypt\\DcsInfo.dcs", DcsInfoImg, sizeDcsInfo);
-				EfiBootInst.DelFile(L"\\EFI\\VeraCrypt\\PlatformInfo");
+				if (!preserveUserConfig)
+					EfiBootInst.DelFile(L"\\EFI\\VeraCrypt\\PlatformInfo");
 				EfiBootInst.SetStartExec(L"VeraCrypt BootLoader (DcsBoot)", L"\\EFI\\VeraCrypt\\DcsBoot.efi");
 
+				if (EfiBootInst.FileExists (szStdEfiBootloader))
+					EfiBootInst.SaveFile(szStdEfiBootloader, dcsBootImg, sizeDcsBoot);
 				EfiBootInst.SaveFile(L"\\EFI\\Microsoft\\Boot\\bootmgfw.efi", dcsBootImg, sizeDcsBoot);
 				// move configuration file from old location (if it exists) to new location
 				// we don't force the move operation if the new location already exists
@@ -4053,60 +4082,66 @@ namespace VeraCrypt
 			}
 			unsigned __int64 loaderSize = 0;
 			std::vector<byte> bootLoaderBuf;
+			const wchar_t * szStdEfiBootloader = Is64BitOs()? L"\\EFI\\Boot\\bootx64.efi": L"\\EFI\\Boot\\bootia32.efi";
+			const wchar_t * szBackupEfiBootloader = Is64BitOs()? L"\\EFI\\Boot\\original_bootx64.vc_backup": L"\\EFI\\Boot\\original_bootia32.vc_backup";
+			const char* g_szMsBootString = "bootmgfw.pdb";
+			bool bModifiedMsBoot = true;
 
 			finally_do ({ EfiBootInst.DismountBootPartition(); });
 
 			EfiBootInst.MountBootPartition(0);		
 
 			EfiBootInst.GetFileSize(L"\\EFI\\Microsoft\\Boot\\bootmgfw.efi", loaderSize);
+			bootLoaderBuf.resize ((size_t) loaderSize);
+			EfiBootInst.ReadFile(L"\\EFI\\Microsoft\\Boot\\bootmgfw.efi", &bootLoaderBuf[0], (DWORD) loaderSize);
 
 			// DcsBoot.efi is always smaller than 32KB
-			if (loaderSize < 32768)
+			if (loaderSize > 32768)
 			{
-				bootLoaderBuf.resize ((size_t) loaderSize);
-
-				EfiBootInst.ReadFile(L"\\EFI\\Microsoft\\Boot\\bootmgfw.efi", &bootLoaderBuf[0], (DWORD) loaderSize);
-
-				// Prevent VeraCrypt EFI loader from being backed up
-				for (size_t i = 0; i < (size_t) loaderSize - (wcslen (_T(TC_APP_NAME)) * 2); ++i)
+				// look for bootmgfw.efi identifiant string
+				if (BufferHasPattern (bootLoaderBuf.data (), (size_t) loaderSize, g_szMsBootString, strlen (g_szMsBootString)))
+					bModifiedMsBoot = false;
+			}
+			else
+			{
+				if (BufferHasPattern (bootLoaderBuf.data (), (size_t) loaderSize, _T(TC_APP_NAME), wcslen (_T(TC_APP_NAME)) * 2))
 				{
-					if (memcmp (&bootLoaderBuf[i], _T(TC_APP_NAME), wcslen (_T(TC_APP_NAME)) * 2) == 0)
-					{
-						Error ("WINDOWS_EFI_BOOT_LOADER_MISSING", ParentWindow);
+					if (AskWarnNoYes ("TC_BOOT_LOADER_ALREADY_INSTALLED", ParentWindow) == IDNO)
 						throw UserAbort (SRC_POS);
-					}
+					return;
 				}
 			}
 
-			EfiBootInst.GetFileSize(Is64BitOs()? L"\\EFI\\Boot\\bootx64.efi" : L"\\EFI\\Boot\\bootia32.efi", loaderSize);
-
-			bootLoaderBuf.resize ((size_t) loaderSize);
+			if (bModifiedMsBoot)
+			{
+				Error ("WINDOWS_EFI_BOOT_LOADER_MISSING", ParentWindow);
+				throw UserAbort (SRC_POS);
+			}
 
-			EfiBootInst.ReadFile(Is64BitOs()? L"\\EFI\\Boot\\bootx64.efi": L"\\EFI\\Boot\\bootia32.efi", &bootLoaderBuf[0], (DWORD) loaderSize);
+			EfiBootInst.CopyFile (L"\\EFI\\Microsoft\\Boot\\bootmgfw.efi", L"\\EFI\\Microsoft\\Boot\\bootmgfw_ms.vc");
 
-			// Prevent VeraCrypt EFI loader from being backed up
-			for (size_t i = 0; i < (size_t) loaderSize - (wcslen (_T(TC_APP_NAME)) * 2); ++i)
+			if (EfiBootInst.FileExists (szStdEfiBootloader))
 			{
-				if (memcmp (&bootLoaderBuf[i], _T(TC_APP_NAME), wcslen (_T(TC_APP_NAME)) * 2) == 0)
+				EfiBootInst.GetFileSize (szStdEfiBootloader, loaderSize);
+
+				bootLoaderBuf.resize ((size_t) loaderSize);
+
+				EfiBootInst.ReadFile (szStdEfiBootloader, &bootLoaderBuf[0], (DWORD) loaderSize);
+
+				// Prevent VeraCrypt EFI loader from being backed up
+				if (BufferHasPattern (bootLoaderBuf.data (), (size_t) loaderSize, _T(TC_APP_NAME), wcslen (_T(TC_APP_NAME)) * 2))
 				{
 					if (AskWarnNoYes ("TC_BOOT_LOADER_ALREADY_INSTALLED", ParentWindow) == IDNO)
 						throw UserAbort (SRC_POS);
 					return;
 				}
-			}
 
-			if (Is64BitOs())
-			{
-				EfiBootInst.CopyFile(L"\\EFI\\Boot\\bootx64.efi", GetSystemLoaderBackupPath().c_str());
-				EfiBootInst.CopyFile(L"\\EFI\\Boot\\bootx64.efi", L"\\EFI\\Boot\\original_bootx64.vc_backup");
+				EfiBootInst.CopyFile (szStdEfiBootloader, GetSystemLoaderBackupPath().c_str());
+				EfiBootInst.CopyFile (szStdEfiBootloader, szBackupEfiBootloader);
 			}
 			else
-			{
-				EfiBootInst.CopyFile(L"\\EFI\\Boot\\bootia32.efi", GetSystemLoaderBackupPath().c_str());
-				EfiBootInst.CopyFile(L"\\EFI\\Boot\\bootia32.efi", L"\\EFI\\Boot\\original_bootia32.vc_backup");
-			}
+				EfiBootInst.CopyFile (L"\\EFI\\Microsoft\\Boot\\bootmgfw.efi", GetSystemLoaderBackupPath().c_str());
 
-			EfiBootInst.CopyFile (L"\\EFI\\Microsoft\\Boot\\bootmgfw.efi", L"\\EFI\\Microsoft\\Boot\\bootmgfw_ms.vc");
 		}
 		else
 		{
diff --git a/src/Common/BootEncryption.h b/src/Common/BootEncryption.h
index 5ce15362..58cdd2e0 100644
--- a/src/Common/BootEncryption.h
+++ b/src/Common/BootEncryption.h
@@ -235,7 +235,7 @@ namespace VeraCrypt
 	class BootEncryption
 	{
 	public:
-		BootEncryption (HWND parent);
+		BootEncryption (HWND parent, bool postOOBE = false);
 		~BootEncryption ();
 
 		enum FilterType
@@ -343,6 +343,7 @@ namespace VeraCrypt
 		bool RealSystemDriveSizeValid;
 		bool RescueVolumeHeaderValid;
 		bool VolumeHeaderValid;
+		bool PostOOBEMode;
 	};
 }
 
diff --git a/src/Common/Dlgcode.c b/src/Common/Dlgcode.c
index 00e1558f..7d2fffba 100644
--- a/src/Common/Dlgcode.c
+++ b/src/Common/Dlgcode.c
@@ -13643,3 +13643,22 @@ BOOL GetSetupconfigLocation (wchar_t* path, DWORD cchSize)
 
 	return bResult;
 }
+
+BOOL BufferHasPattern (const unsigned char* buffer, size_t bufferLen, const void* pattern, size_t patternLen)
+{
+	BOOL bRet = FALSE;
+	if (patternLen <= bufferLen)
+	{
+		size_t i;
+		for (i = 0; i <= (bufferLen - patternLen); ++i)
+		{
+			if (memcmp (&buffer[i], pattern, patternLen) == 0)
+			{
+				bRet = TRUE;
+				break;
+			}
+		}
+	}
+
+	return bRet;
+}
diff --git a/src/Common/Dlgcode.h b/src/Common/Dlgcode.h
index 681f2814..ded84578 100644
--- a/src/Common/Dlgcode.h
+++ b/src/Common/Dlgcode.h
@@ -532,6 +532,7 @@ INT_PTR SecureDesktopDialogBoxParam (HINSTANCE, LPCWSTR, HWND, DLGPROC, LPARAM);
 BOOL VerifyModuleSignature (const wchar_t* path);
 void GetInstallationPath (HWND hwndDlg, wchar_t* szInstallPath, DWORD cchSize, BOOL* pbInstallPathDetermined);
 BOOL GetSetupconfigLocation (wchar_t* path, DWORD cchSize);
+BOOL BufferHasPattern (const unsigned char* buffer, size_t bufferLen, const void* pattern, size_t patternLen);
 #ifdef __cplusplus
 }
author	Mounir IDRASSI <mounir.idrassi@idrix.fr>	2018-05-02 19:59:50 +0200
committer	Mounir IDRASSI <mounir.idrassi@idrix.fr>	2018-05-03 08:25:22 +0200
commit	98ff65045e7b6f6cda3bec644b5da4fd61bdf57a (patch)
tree	fb9f05fd240ec7439c512a0553599028283db0bc /src/Common
parent	143d6c1dde328c051200e754248906e145606b8a (diff)
download	VeraCrypt-98ff65045e7b6f6cda3bec644b5da4fd61bdf57a.tar.gz VeraCrypt-98ff65045e7b6f6cda3bec644b5da4fd61bdf57a.zip