diff options
Diffstat (limited to 'src/VBox/HostDrivers/Support/win/SUPR3HardenedMainImports-win.cpp')
| -rw-r--r-- | src/VBox/HostDrivers/Support/win/SUPR3HardenedMainImports-win.cpp | 863 |
1 files changed, 863 insertions, 0 deletions
diff --git a/src/VBox/HostDrivers/Support/win/SUPR3HardenedMainImports-win.cpp b/src/VBox/HostDrivers/Support/win/SUPR3HardenedMainImports-win.cpp new file mode 100644 index 00000000..eada4678 --- /dev/null +++ b/src/VBox/HostDrivers/Support/win/SUPR3HardenedMainImports-win.cpp @@ -0,0 +1,863 @@ +/* $Id: SUPR3HardenedMainImports-win.cpp $ */ +/** @file + * VirtualBox Support Library - Hardened Main, Windows Import Trickery. + */ + +/* + * Copyright (C) 2006-2019 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#include <iprt/nt/nt-and-windows.h> + +#include <VBox/sup.h> +#include <VBox/err.h> +#include <iprt/ctype.h> +#include <iprt/initterm.h> +#include <iprt/param.h> +#include <iprt/string.h> +#include <iprt/utf16.h> + +#include "SUPLibInternal.h" +#include "SUPHardenedVerify-win.h" + + +/********************************************************************************************************************************* +* Defined Constants And Macros * +*********************************************************************************************************************************/ +#define SUPHARNT_COMMENT(a_Blah) /* nothing */ + +#define VBOX_HARDENED_STUB_WITHOUT_IMPORTS +#ifdef VBOX_HARDENED_STUB_WITHOUT_IMPORTS +# define SUPHNTIMP_ERROR(a_fReportErrors, a_id, a_szWhere, a_enmOp, a_rc, ...) \ + do { \ + if (a_fReportErrors) supR3HardenedFatalMsg(a_szWhere, a_enmOp, a_rc, __VA_ARGS__); \ + else { static const char s_szWhere[] = a_szWhere; *(char *)(uintptr_t)(a_id) += 1; __debugbreak(); } \ + } while (0) +#else +# define SUPHNTIMP_ERROR(a_fReportErrors, a_id, a_szWhere, a_enmOp, a_rc, ...) \ + supR3HardenedFatalMsg(a_szWhere, a_enmOp, a_rc, __VA_ARGS__) + +#endif + + +/********************************************************************************************************************************* +* Defined Constants And Macros * +*********************************************************************************************************************************/ +/** + * Import function entry. + */ +typedef struct SUPHNTIMPFUNC +{ + /** The name of the function we're importing. */ + const char *pszName; + /** Where to store the function address (think __imp_ApiName). */ + PFNRT *ppfnImport; + /** Pointer to an early dummy function for imports that aren't available + * during early process initialization. */ + PFNRT pfnEarlyDummy; + /** Indicates whether this is an optional import and failure to locate it + * should set it to NULL instead of freaking out. */ + bool fOptional; +} SUPHNTIMPFUNC; +/** Pointer to an import table entry. */ +typedef SUPHNTIMPFUNC const *PCSUPHNTIMPFUNC; + +/** + * Information for constructing a direct system call. + */ +typedef struct SUPHNTIMPSYSCALL +{ + /** Where to store the system call number. + * NULL if this import doesn't stupport direct system call. */ + uint32_t *puApiNo; + /** Assembly system call routine, type 1. */ + PFNRT pfnType1; + /** Assembly system call routine, type 2. */ + PFNRT pfnType2; +#ifdef RT_ARCH_X86 + /** The parameter size in bytes for a standard call. */ + uint32_t cbParams; +#endif +} SUPHNTIMPSYSCALL; +/** Pointer to a system call entry. */ +typedef SUPHNTIMPSYSCALL const *PCSUPHNTIMPSYSCALL; + +/** + * Import DLL. + * + * This contains both static (like name & imports) and runtime information (like + * load and export table locations). + * + * @sa RTDBGNTKRNLMODINFO + */ +typedef struct SUPHNTIMPDLL +{ + /** @name Static data. + * @{ */ + const wchar_t *pwszName; + const char *pszName; + size_t cImports; + PCSUPHNTIMPFUNC paImports; + /** Array running parallel to paImports if present. */ + PCSUPHNTIMPSYSCALL paSyscalls; + /** @} */ + + + /** The image base. */ + uint8_t const *pbImageBase; + /** The NT headers. */ + PIMAGE_NT_HEADERS pNtHdrs; + /** The NT header offset/RVA. */ + uint32_t offNtHdrs; + /** The end of the section headers. */ + uint32_t offEndSectHdrs; + /** The end of the image. */ + uint32_t cbImage; + /** Offset of the export directory. */ + uint32_t offExportDir; + /** Size of the export directory. */ + uint32_t cbExportDir; + + /** Exported functions and data by ordinal (RVAs). */ + uint32_t const *paoffExports; + /** The number of exports. */ + uint32_t cExports; + /** The number of exported names. */ + uint32_t cNamedExports; + /** Pointer to the array of exported names (RVAs to strings). */ + uint32_t const *paoffNamedExports; + /** Array parallel to paoffNamedExports with the corresponding ordinals + * (indexes into paoffExports). */ + uint16_t const *pau16NameOrdinals; + + /** Number of patched export table entries. */ + uint32_t cPatchedExports; + +} SUPHNTIMPDLL; +/** Pointer to an import DLL entry. */ +typedef SUPHNTIMPDLL *PSUPHNTIMPDLL; + + + +/* + * Declare assembly symbols. + */ +#define SUPHARNT_IMPORT_STDCALL_EARLY(a_Name, a_cbParamsX86) \ + extern PFNRT RT_CONCAT(g_pfn, a_Name); +#define SUPHARNT_IMPORT_STDCALL_EARLY_OPTIONAL(a_Name, a_cbParamsX86) SUPHARNT_IMPORT_STDCALL_EARLY(a_Name, a_cbParamsX86) +#define SUPHARNT_IMPORT_SYSCALL(a_Name, a_cbParamsX86) \ + SUPHARNT_IMPORT_STDCALL_EARLY(a_Name, a_cbParamsX86) \ + extern uint32_t RT_CONCAT(g_uApiNo, a_Name); \ + extern FNRT RT_CONCAT(a_Name, _SyscallType1); \ + extern FNRT RT_CONCAT(a_Name, _SyscallType2); +#define SUPHARNT_IMPORT_STDCALL(a_Name, a_cbParamsX86) \ + extern PFNRT RT_CONCAT(g_pfn, a_Name); \ + extern FNRT RT_CONCAT(a_Name, _Early); +#define SUPHARNT_IMPORT_STDCALL_OPTIONAL(a_Name, a_cbParamsX86) SUPHARNT_IMPORT_STDCALL(a_Name, a_cbParamsX86) + +RT_C_DECLS_BEGIN +#include "import-template-ntdll.h" +#include "import-template-kernel32.h" +RT_C_DECLS_END + +/* + * Import functions. + */ +#undef SUPHARNT_IMPORT_SYSCALL +#undef SUPHARNT_IMPORT_STDCALL_EARLY +#undef SUPHARNT_IMPORT_STDCALL_EARLY_OPTIONAL +#undef SUPHARNT_IMPORT_STDCALL +#undef SUPHARNT_IMPORT_STDCALL_OPTIONAL +#define SUPHARNT_IMPORT_SYSCALL(a_Name, a_cbParamsX86) \ + { #a_Name, &RT_CONCAT(g_pfn, a_Name), NULL, false }, +#define SUPHARNT_IMPORT_STDCALL_EARLY(a_Name, a_cbParamsX86) \ + { #a_Name, &RT_CONCAT(g_pfn, a_Name), NULL, false }, +#define SUPHARNT_IMPORT_STDCALL_EARLY_OPTIONAL(a_Name, a_cbParamsX86) \ + { #a_Name, &RT_CONCAT(g_pfn, a_Name), NULL, true }, +#define SUPHARNT_IMPORT_STDCALL(a_Name, a_cbParamsX86) \ + { #a_Name, &RT_CONCAT(g_pfn, a_Name), RT_CONCAT(a_Name,_Early), false }, +#define SUPHARNT_IMPORT_STDCALL_OPTIONAL(a_Name, a_cbParamsX86) \ + { #a_Name, &RT_CONCAT(g_pfn, a_Name), RT_CONCAT(a_Name,_Early), true }, +static const SUPHNTIMPFUNC g_aSupNtImpNtDllFunctions[] = +{ +#include "import-template-ntdll.h" +}; + +static const SUPHNTIMPFUNC g_aSupNtImpKernel32Functions[] = +{ +#include "import-template-kernel32.h" +}; + + + +/* + * Syscalls in ntdll. + */ +#undef SUPHARNT_IMPORT_SYSCALL +#undef SUPHARNT_IMPORT_STDCALL_EARLY +#undef SUPHARNT_IMPORT_STDCALL_EARLY_OPTIONAL +#undef SUPHARNT_IMPORT_STDCALL +#undef SUPHARNT_IMPORT_STDCALL_OPTIONAL +#ifdef RT_ARCH_AMD64 +# define SUPHARNT_IMPORT_STDCALL(a_Name, a_cbParamsX86) \ + { NULL, NULL }, +# define SUPHARNT_IMPORT_SYSCALL(a_Name, a_cbParamsX86) \ + { &RT_CONCAT(g_uApiNo, a_Name), &RT_CONCAT(a_Name, _SyscallType1), &RT_CONCAT(a_Name, _SyscallType2) }, +#elif defined(RT_ARCH_X86) +# define SUPHARNT_IMPORT_STDCALL(a_Name, a_cbParamsX86) \ + { NULL, NULL, NULL, 0 }, +# define SUPHARNT_IMPORT_SYSCALL(a_Name, a_cbParamsX86) \ + { &RT_CONCAT(g_uApiNo, a_Name), &RT_CONCAT(a_Name,_SyscallType1), &RT_CONCAT(a_Name, _SyscallType2), a_cbParamsX86 }, +#endif +#define SUPHARNT_IMPORT_STDCALL_OPTIONAL(a_Name, a_cbParamsX86) SUPHARNT_IMPORT_STDCALL(a_Name, a_cbParamsX86) +#define SUPHARNT_IMPORT_STDCALL_EARLY(a_Name, a_cbParamsX86) SUPHARNT_IMPORT_STDCALL(a_Name, a_cbParamsX86) +#define SUPHARNT_IMPORT_STDCALL_EARLY_OPTIONAL(a_Name, a_cbParamsX86) SUPHARNT_IMPORT_STDCALL(a_Name, a_cbParamsX86) +static const SUPHNTIMPSYSCALL g_aSupNtImpNtDllSyscalls[] = +{ +#include "import-template-ntdll.h" +}; + + +/** + * All the DLLs we import from. + * @remarks Code ASSUMES that ntdll is the first entry. + */ +static SUPHNTIMPDLL g_aSupNtImpDlls[] = +{ + { L"ntdll.dll", "ntdll.dll", RT_ELEMENTS(g_aSupNtImpNtDllFunctions), g_aSupNtImpNtDllFunctions, g_aSupNtImpNtDllSyscalls }, + { L"kernelbase.dll", "kernelbase.dll", 0 /* optional module, forwarders only */, NULL, NULL }, + { L"kernel32.dll", "kernel32.dll", RT_ELEMENTS(g_aSupNtImpKernel32Functions), g_aSupNtImpKernel32Functions, NULL }, +}; + + +static void supR3HardenedFindOrLoadModule(PSUPHNTIMPDLL pDll) +{ +#ifdef VBOX_HARDENED_STUB_WITHOUT_IMPORTS + uint32_t const cbName = (uint32_t)RTUtf16Len(pDll->pwszName) * sizeof(WCHAR); + PPEB_LDR_DATA pLdrData = NtCurrentPeb()->Ldr; + LIST_ENTRY *pList = &pLdrData->InMemoryOrderModuleList; + LIST_ENTRY *pListEntry = pList->Flink; + uint32_t cLoops = 0; + while (pListEntry != pList && cLoops < 1024) + { + PLDR_DATA_TABLE_ENTRY pLdrEntry = RT_FROM_MEMBER(pListEntry, LDR_DATA_TABLE_ENTRY, InMemoryOrderLinks); + + if ( pLdrEntry->FullDllName.Length > cbName + sizeof(WCHAR) + && ( pLdrEntry->FullDllName.Buffer[(pLdrEntry->FullDllName.Length - cbName) / sizeof(WCHAR) - 1] == '\\' + || pLdrEntry->FullDllName.Buffer[(pLdrEntry->FullDllName.Length - cbName) / sizeof(WCHAR) - 1] == '/') + && RTUtf16ICmpAscii(&pLdrEntry->FullDllName.Buffer[(pLdrEntry->FullDllName.Length - cbName) / sizeof(WCHAR)], + pDll->pszName) == 0) + { + pDll->pbImageBase = (uint8_t *)pLdrEntry->DllBase; + return; + } + + pListEntry = pListEntry->Flink; + cLoops++; + } + + if (!pDll->cImports) + pDll->pbImageBase = NULL; /* optional */ + else + SUPHNTIMP_ERROR(false, 1, "supR3HardenedFindOrLoadModule", kSupInitOp_Misc, VERR_MODULE_NOT_FOUND, + "Failed to locate %ls", pDll->pwszName); +#else + HMODULE hmod = GetModuleHandleW(pDll->pwszName); + if (RT_UNLIKELY(!hmod && pDll->cImports)) + SUPHNTIMP_ERROR(true, 1, "supR3HardenedWinInitImports", kSupInitOp_Misc, VERR_MODULE_NOT_FOUND, + "Failed to locate %ls", pDll->pwszName); + pDll->pbImageBase = (uint8_t *)hmod; +#endif +} + + +/** @sa rtR0DbgKrnlNtParseModule */ +static void supR3HardenedParseModule(PSUPHNTIMPDLL pDll) +{ + /* + * Locate the PE header, do some basic validations. + */ + IMAGE_DOS_HEADER const *pMzHdr = (IMAGE_DOS_HEADER const *)pDll->pbImageBase; + uint32_t offNtHdrs = 0; + PIMAGE_NT_HEADERS pNtHdrs; + if (pMzHdr->e_magic == IMAGE_DOS_SIGNATURE) + { + offNtHdrs = pMzHdr->e_lfanew; + if (offNtHdrs > _2K) + SUPHNTIMP_ERROR(false, 2, "supR3HardenedParseModule", kSupInitOp_Misc, VERR_MODULE_NOT_FOUND, + "%ls: e_lfanew=%#x, expected a lower value", pDll->pwszName, offNtHdrs); + } + pDll->pNtHdrs = pNtHdrs = (PIMAGE_NT_HEADERS)&pDll->pbImageBase[offNtHdrs]; + + if (pNtHdrs->Signature != IMAGE_NT_SIGNATURE) + SUPHNTIMP_ERROR(false, 3, "supR3HardenedParseModule", kSupInitOp_Misc, VERR_INVALID_EXE_SIGNATURE, + "%ls: Invalid PE signature: %#x", pDll->pwszName, pNtHdrs->Signature); + if (pNtHdrs->FileHeader.SizeOfOptionalHeader != sizeof(pNtHdrs->OptionalHeader)) + SUPHNTIMP_ERROR(false, 4, "supR3HardenedParseModule", kSupInitOp_Misc, VERR_INVALID_EXE_SIGNATURE, + "%ls: Unexpected optional header size: %#x", pDll->pwszName, pNtHdrs->FileHeader.SizeOfOptionalHeader); + if (pNtHdrs->OptionalHeader.Magic != RT_CONCAT3(IMAGE_NT_OPTIONAL_HDR,ARCH_BITS,_MAGIC)) + SUPHNTIMP_ERROR(false, 5, "supR3HardenedParseModule", kSupInitOp_Misc, VERR_INVALID_EXE_SIGNATURE, + "%ls: Unexpected optional header magic: %#x", pDll->pwszName, pNtHdrs->OptionalHeader.Magic); + if (pNtHdrs->OptionalHeader.NumberOfRvaAndSizes != IMAGE_NUMBEROF_DIRECTORY_ENTRIES) + SUPHNTIMP_ERROR(false, 6, "supR3HardenedParseModule", kSupInitOp_Misc, VERR_INVALID_EXE_SIGNATURE, + "%ls: Unexpected number of RVA and sizes: %#x", pDll->pwszName, pNtHdrs->OptionalHeader.NumberOfRvaAndSizes); + + pDll->offNtHdrs = offNtHdrs; + pDll->offEndSectHdrs = offNtHdrs + + sizeof(*pNtHdrs) + + pNtHdrs->FileHeader.NumberOfSections * sizeof(IMAGE_SECTION_HEADER); + pDll->cbImage = pNtHdrs->OptionalHeader.SizeOfImage; + + /* + * Find the export directory. + */ + IMAGE_DATA_DIRECTORY ExpDir = pNtHdrs->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT]; + if ( ExpDir.Size < sizeof(IMAGE_EXPORT_DIRECTORY) + || ExpDir.VirtualAddress < pDll->offEndSectHdrs + || ExpDir.VirtualAddress >= pNtHdrs->OptionalHeader.SizeOfImage + || ExpDir.VirtualAddress + ExpDir.Size > pNtHdrs->OptionalHeader.SizeOfImage) + SUPHNTIMP_ERROR(false, 7, "supR3HardenedParseModule", kSupInitOp_Misc, VERR_INVALID_EXE_SIGNATURE, + "%ls: Missing or invalid export directory: %#lx LB %#x", pDll->pwszName, ExpDir.VirtualAddress, ExpDir.Size); + pDll->offExportDir = ExpDir.VirtualAddress; + pDll->cbExportDir = ExpDir.Size; + + IMAGE_EXPORT_DIRECTORY const *pExpDir = (IMAGE_EXPORT_DIRECTORY const *)&pDll->pbImageBase[ExpDir.VirtualAddress]; + + if ( pExpDir->NumberOfFunctions >= _1M + || pExpDir->NumberOfFunctions < 1 + || pExpDir->NumberOfNames >= _1M + || pExpDir->NumberOfNames < 1) + SUPHNTIMP_ERROR(false, 8, "supR3HardenedParseModule", kSupInitOp_Misc, VERR_INVALID_EXE_SIGNATURE, + "%ls: NumberOfNames or/and NumberOfFunctions are outside the expected range: nof=%#x non=%#x\n", + pDll->pwszName, pExpDir->NumberOfFunctions, pExpDir->NumberOfNames); + pDll->cNamedExports = pExpDir->NumberOfNames; + pDll->cExports = RT_MAX(pExpDir->NumberOfNames, pExpDir->NumberOfFunctions); + + if ( pExpDir->AddressOfFunctions < pDll->offEndSectHdrs + || pExpDir->AddressOfFunctions >= pNtHdrs->OptionalHeader.SizeOfImage + || pExpDir->AddressOfFunctions + pDll->cExports * sizeof(uint32_t) > pNtHdrs->OptionalHeader.SizeOfImage) + SUPHNTIMP_ERROR(false, 9, "supR3HardenedParseModule", kSupInitOp_Misc, VERR_INVALID_EXE_SIGNATURE, + "%ls: Bad AddressOfFunctions: %#x\n", pDll->pwszName, pExpDir->AddressOfFunctions); + pDll->paoffExports = (uint32_t const *)&pDll->pbImageBase[pExpDir->AddressOfFunctions]; + + if ( pExpDir->AddressOfNames < pDll->offEndSectHdrs + || pExpDir->AddressOfNames >= pNtHdrs->OptionalHeader.SizeOfImage + || pExpDir->AddressOfNames + pExpDir->NumberOfNames * sizeof(uint32_t) > pNtHdrs->OptionalHeader.SizeOfImage) + SUPHNTIMP_ERROR(false, 10, "supR3HardenedParseModule", kSupInitOp_Misc, VERR_INVALID_EXE_SIGNATURE, + "%ls: Bad AddressOfNames: %#x\n", pDll->pwszName, pExpDir->AddressOfNames); + pDll->paoffNamedExports = (uint32_t const *)&pDll->pbImageBase[pExpDir->AddressOfNames]; + + if ( pExpDir->AddressOfNameOrdinals < pDll->offEndSectHdrs + || pExpDir->AddressOfNameOrdinals >= pNtHdrs->OptionalHeader.SizeOfImage + || pExpDir->AddressOfNameOrdinals + pExpDir->NumberOfNames * sizeof(uint32_t) > pNtHdrs->OptionalHeader.SizeOfImage) + SUPHNTIMP_ERROR(false, 11, "supR3HardenedParseModule", kSupInitOp_Misc, VERR_INVALID_EXE_SIGNATURE, + "%ls: Bad AddressOfNameOrdinals: %#x\n", pDll->pwszName, pExpDir->AddressOfNameOrdinals); + pDll->pau16NameOrdinals = (uint16_t const *)&pDll->pbImageBase[pExpDir->AddressOfNameOrdinals]; +} + + +/** @sa rtR0DbgKrnlInfoLookupSymbol */ +static const char *supR3HardenedResolveImport(PSUPHNTIMPDLL pDll, PCSUPHNTIMPFUNC pImport, bool fReportErrors) +{ + /* + * Binary search. + */ + uint32_t iStart = 0; + uint32_t iEnd = pDll->cNamedExports; + while (iStart < iEnd) + { + uint32_t iCur = iStart + (iEnd - iStart) / 2; + uint32_t offExpName = pDll->paoffNamedExports[iCur]; + if (RT_UNLIKELY(offExpName < pDll->offEndSectHdrs || offExpName >= pDll->cbImage)) + SUPHNTIMP_ERROR(fReportErrors, 12, "supR3HardenedResolveImport", kSupInitOp_Misc, VERR_SYMBOL_NOT_FOUND, + "%ls: Bad export name entry: %#x (iCur=%#x)", pDll->pwszName, offExpName, iCur); + + const char *pszExpName = (const char *)&pDll->pbImageBase[offExpName]; + int iDiff = strcmp(pszExpName, pImport->pszName); + if (iDiff > 0) /* pszExpName > pszSymbol: search chunck before i */ + iEnd = iCur; + else if (iDiff < 0) /* pszExpName < pszSymbol: search chunk after i */ + iStart = iCur + 1; + else /* pszExpName == pszSymbol */ + { + uint16_t iExpOrdinal = pDll->pau16NameOrdinals[iCur]; + if (iExpOrdinal < pDll->cExports) + { + uint32_t offExport = pDll->paoffExports[iExpOrdinal]; + + /* detect export table patching. */ + if (offExport >= pDll->cbImage) + pDll->cPatchedExports++; + + if (offExport - pDll->offExportDir >= pDll->cbExportDir) + { + *pImport->ppfnImport = (PFNRT)&pDll->pbImageBase[offExport]; + return NULL; + } + + /* Forwarder. */ + return (const char *)&pDll->pbImageBase[offExport]; + } + SUPHNTIMP_ERROR(fReportErrors, 14, "supR3HardenedResolveImport", kSupInitOp_Misc, VERR_BAD_EXE_FORMAT, + "%ls: Name ordinal for '%s' is out of bounds: %#x (max %#x)", + pDll->pwszName, iExpOrdinal, pDll->cExports); + return NULL; + } + } + + if (!pImport->fOptional) + SUPHNTIMP_ERROR(fReportErrors, 15, "supR3HardenedResolveImport", kSupInitOp_Misc, VERR_SYMBOL_NOT_FOUND, + "%ls: Failed to resolve '%s'.", pDll->pwszName, pImport->pszName); + *pImport->ppfnImport = NULL; + return NULL; +} + + +static void supR3HardenedDirectSyscall(PSUPHNTIMPDLL pDll, PCSUPHNTIMPFUNC pImport, PCSUPHNTIMPSYSCALL pSyscall, + PSUPHNTLDRCACHEENTRY pLdrEntry, uint8_t *pbBits, bool fReportErrors) +{ + /* + * Skip non-syscall entries. + */ + if (!pSyscall->puApiNo) + return; + + /* + * Locate the virgin bits. + */ + RTLDRADDR uValue; + int rc = RTLdrGetSymbolEx(pLdrEntry->hLdrMod, pbBits, (uintptr_t)pDll->pbImageBase, UINT32_MAX, pImport->pszName, &uValue); + if (RT_FAILURE(rc)) + { + SUPHNTIMP_ERROR(fReportErrors, 16, "supR3HardenedDirectSyscall", kSupInitOp_Misc, rc, + "%s: RTLdrGetSymbolEx failed on %s: %Rrc", pDll->pszName, pImport->pszName, rc); + return; + } + uintptr_t offSymbol = (uintptr_t)uValue - (uintptr_t)pDll->pbImageBase; + uint8_t const *pbFunction = &pbBits[offSymbol]; + + /* + * Parse the code and extract the API call number. + */ +#ifdef RT_ARCH_AMD64 + /* Pattern #1: XP64/W2K3-64 thru Windows 10 build 10240. + 0:000> u ntdll!NtCreateSection + ntdll!NtCreateSection: + 00000000`779f1750 4c8bd1 mov r10,rcx + 00000000`779f1753 b847000000 mov eax,47h + 00000000`779f1758 0f05 syscall + 00000000`779f175a c3 ret + 00000000`779f175b 0f1f440000 nop dword ptr [rax+rax] + + Pattern #2: Windows 10 build 10525+. + 0:000> u ntdll_7ffc26300000!NtCreateSection + ntdll_7ffc26300000!ZwCreateSection: + 00007ffc`263943e0 4c8bd1 mov r10,rcx + 00007ffc`263943e3 b84a000000 mov eax,4Ah + 00007ffc`263943e8 f604250803fe7f01 test byte ptr [SharedUserData+0x308 (00000000`7ffe0308)],1 + 00007ffc`263943f0 7503 jne ntdll_7ffc26300000!ZwCreateSection+0x15 (00007ffc`263943f5) + 00007ffc`263943f2 0f05 syscall + 00007ffc`263943f4 c3 ret + 00007ffc`263943f5 cd2e int 2Eh + 00007ffc`263943f7 c3 ret + */ + if ( pbFunction[ 0] == 0x4c /* mov r10, rcx */ + && pbFunction[ 1] == 0x8b + && pbFunction[ 2] == 0xd1 + && pbFunction[ 3] == 0xb8 /* mov eax, 0000yyzzh */ + //&& pbFunction[ 4] == 0xZZ + //&& pbFunction[ 5] == 0xYY + && pbFunction[ 6] == 0x00 + && pbFunction[ 7] == 0x00) + { + if ( pbFunction[ 8] == 0x0f /* syscall */ + && pbFunction[ 9] == 0x05 + && pbFunction[10] == 0xc3 /* ret */ ) + { + *pSyscall->puApiNo = RT_MAKE_U16(pbFunction[4], pbFunction[5]); + *pImport->ppfnImport = pSyscall->pfnType1; + return; + } + if ( pbFunction[ 8] == 0xf6 /* test byte ptr [SharedUserData+0x308 (00000000`7ffe0308)],1 */ + && pbFunction[ 9] == 0x04 + && pbFunction[10] == 0x25 + && pbFunction[11] == 0x08 + && pbFunction[12] == 0x03 + && pbFunction[13] == 0xfe + && pbFunction[14] == 0x7f + && pbFunction[15] == 0x01 + && pbFunction[16] == 0x75 /* jnz +3 */ + && pbFunction[17] == 0x03 + && pbFunction[18] == 0x0f /* syscall*/ + && pbFunction[19] == 0x05 + && pbFunction[20] == 0xc3 /* ret */ + && pbFunction[21] == 0xcd /* int 2eh */ + && pbFunction[22] == 0x2e + && pbFunction[23] == 0xc3 /* ret */ ) + { + *pSyscall->puApiNo = RT_MAKE_U16(pbFunction[4], pbFunction[5]); + *pImport->ppfnImport = pSyscall->pfnType2; + return; + } + } +#else + /* Pattern #1: XP thru Windows 7 + kd> u ntdll!NtCreateSection + ntdll!NtCreateSection: + 7c90d160 b832000000 mov eax,32h + 7c90d165 ba0003fe7f mov edx,offset SharedUserData!SystemCallStub (7ffe0300) + 7c90d16a ff12 call dword ptr [edx] + 7c90d16c c21c00 ret 1Ch + 7c90d16f 90 nop + The variable bit is the value loaded into eax: XP=32h, W2K3=34h, Vista=4bh, W7=54h + + Pattern #2: Windows 8.1 + 0:000:x86> u ntdll_6a0f0000!NtCreateSection + ntdll_6a0f0000!NtCreateSection: + 6a15eabc b854010000 mov eax,154h + 6a15eac1 e803000000 call ntdll_6a0f0000!NtCreateSection+0xd (6a15eac9) + 6a15eac6 c21c00 ret 1Ch + 6a15eac9 8bd4 mov edx,esp + 6a15eacb 0f34 sysenter + 6a15eacd c3 ret + The variable bit is the value loaded into eax: W81=154h + Note! One nice thing here is that we can share code pattern #1. */ + + if ( pbFunction[ 0] == 0xb8 /* mov eax, 0000yyzzh*/ + //&& pbFunction[ 1] <= 0xZZ + //&& pbFunction[ 2] <= 0xYY + && pbFunction[ 3] == 0x00 + && pbFunction[ 4] == 0x00) + { + *pSyscall->puApiNo = RT_MAKE_U16(pbFunction[1], pbFunction[2]); + if ( pbFunction[5] == 0xba /* mov edx, offset SharedUserData!SystemCallStub */ + && pbFunction[ 6] == 0x00 + && pbFunction[ 7] == 0x03 + && pbFunction[ 8] == 0xfe + && pbFunction[ 9] == 0x7f + && pbFunction[10] == 0xff /* call [edx] */ + && pbFunction[11] == 0x12 + && ( ( pbFunction[12] == 0xc2 /* ret 1ch */ + && pbFunction[13] == pSyscall->cbParams + && pbFunction[14] == 0x00) + || ( pbFunction[12] == 0xc3 /* ret */ + && pSyscall->cbParams == 0) + ) + ) + { + *pImport->ppfnImport = pSyscall->pfnType1; + return; + } + + if ( pbFunction[ 5] == 0xe8 /* call [$+3] */ + && RT_ABS(*(int32_t *)&pbFunction[6]) < 0x10 + && ( ( pbFunction[10] == 0xc2 /* ret 1ch */ + && pbFunction[11] == pSyscall->cbParams + && pbFunction[12] == 0x00) + || ( pbFunction[10] == 0xc3 /* ret */ + && pSyscall->cbParams == 0) + ) + ) + { + *pImport->ppfnImport = pSyscall->pfnType2; + return; + } + } +#endif + + /* + * Failed to parse it. + */ + volatile uint8_t abCopy[16]; + memcpy((void *)&abCopy[0], pbFunction, sizeof(abCopy)); + SUPHNTIMP_ERROR(fReportErrors, 17, "supR3HardenedWinInitImports", kSupInitOp_Misc, rc, + "%ls: failed to parse syscall: '%s': %.16Rhxs", + pDll->pwszName, pImport->pszName, &abCopy[0]); +} + + +/** + * Check out system calls and do the directly instead of via NtDll. + * + * We need to have access to the on disk NTDLL.DLL file as we do not trust the + * stuff we find in memory. Too early to verify signatures though. + * + * @param fReportErrors Whether we've got the machinery for reporting + * errors going already. + * @param pErrInfo Buffer for gathering additional error info. This + * is mainly to avoid consuming lots of stacks with + * RTERRINFOSTATIC structures. + */ +DECLHIDDEN(void) supR3HardenedWinInitSyscalls(bool fReportErrors, PRTERRINFO pErrInfo) +{ + for (uint32_t iDll = 0; iDll < RT_ELEMENTS(g_aSupNtImpDlls); iDll++) + if (g_aSupNtImpDlls[iDll].paSyscalls) + { + PSUPHNTLDRCACHEENTRY pLdrEntry; + int rc = supHardNtLdrCacheOpen(g_aSupNtImpDlls[iDll].pszName, &pLdrEntry, pErrInfo); + if (RT_SUCCESS(rc)) + { + uint8_t *pbBits; + rc = supHardNtLdrCacheEntryGetBits(pLdrEntry, &pbBits, (uintptr_t)g_aSupNtImpDlls[iDll].pbImageBase, + NULL, NULL, pErrInfo); + if (RT_SUCCESS(rc)) + { + for (uint32_t i = 0; i < g_aSupNtImpDlls[iDll].cImports; i++) + supR3HardenedDirectSyscall(&g_aSupNtImpDlls[iDll], &g_aSupNtImpDlls[iDll].paImports[i], + &g_aSupNtImpDlls[iDll].paSyscalls[i], pLdrEntry, pbBits, fReportErrors); + } + else + SUPHNTIMP_ERROR(fReportErrors, 20, "supR3HardenedWinInitImports", kSupInitOp_Misc, rc, + "%ls: supHardNtLdrCacheEntryGetBits failed: %Rrc %s", + g_aSupNtImpDlls[iDll].pwszName, rc, pErrInfo ? pErrInfo->pszMsg : ""); + } + else + SUPHNTIMP_ERROR(fReportErrors, 21, "supR3HardenedWinInitImports", kSupInitOp_Misc, rc, + "%ls: supHardNtLdrCacheOpen failed: %Rrc %s", + g_aSupNtImpDlls[iDll].pwszName, rc, pErrInfo ? pErrInfo->pszMsg : ""); + } +} + + +/** + * Resolves a few NtDll functions we need before child purification is executed. + * + * We must not permanently modify any global data here. + * + * @param uNtDllAddr The address of the NTDLL. + * @param ppfnNtWaitForSingleObject Where to store the NtWaitForSingleObject + * address. + * @param ppfnNtSetEvent Where to store the NtSetEvent address. + */ +DECLHIDDEN(void) supR3HardenedWinGetVeryEarlyImports(uintptr_t uNtDllAddr, + PFNNTWAITFORSINGLEOBJECT *ppfnNtWaitForSingleObject, + PFNNTSETEVENT *ppfnNtSetEvent) +{ + /* + * NTDLL is the first entry in the list. Save it and do the parsing. + */ + SUPHNTIMPDLL SavedDllEntry = g_aSupNtImpDlls[0]; + + g_aSupNtImpDlls[0].pbImageBase = (uint8_t const *)uNtDllAddr; + supR3HardenedParseModule(&g_aSupNtImpDlls[0]); + + /* + * Create a temporary import table for the requested APIs and resolve them. + */ + SUPHNTIMPFUNC aImports[] = + { + { "NtWaitForSingleObject", (PFNRT *)ppfnNtWaitForSingleObject, NULL, false }, + { "NtSetEvent", (PFNRT *)ppfnNtSetEvent, NULL, false }, + }; + + for (uint32_t i = 0; i < RT_ELEMENTS(aImports); i++) + { + const char *pszForwarder = supR3HardenedResolveImport(&g_aSupNtImpDlls[0], &aImports[i], false); + if (pszForwarder) + SUPHNTIMP_ERROR(false, 31, "supR3HardenedWinGetVeryEarlyImports", kSupInitOp_Misc, VERR_MODULE_NOT_FOUND, + "ntdll: Failed to resolve forwarder '%s'.", pszForwarder); + } + + /* + * Restore the NtDll entry. + */ + g_aSupNtImpDlls[0] = SavedDllEntry; +} + + +/** + * Resolves NtDll functions we can trust calling before process init. + * + * @param uNtDllAddr The address of the NTDLL. + */ +DECLHIDDEN(void) supR3HardenedWinInitImportsEarly(uintptr_t uNtDllAddr) +{ + /* + * NTDLL is the first entry in the list. + */ + g_aSupNtImpDlls[0].pbImageBase = (uint8_t const *)uNtDllAddr; + supR3HardenedParseModule(&g_aSupNtImpDlls[0]); + for (uint32_t i = 0; i < g_aSupNtImpDlls[0].cImports; i++) + if (!g_aSupNtImpDlls[0].paImports[i].pfnEarlyDummy) + { + const char *pszForwarder = supR3HardenedResolveImport(&g_aSupNtImpDlls[0], &g_aSupNtImpDlls[0].paImports[i], false); + if (pszForwarder) + SUPHNTIMP_ERROR(false, 32, "supR3HardenedWinInitImports", kSupInitOp_Misc, VERR_MODULE_NOT_FOUND, + "ntdll: Failed to resolve forwarder '%s'.", pszForwarder); + } + else + *g_aSupNtImpDlls[0].paImports[i].ppfnImport = g_aSupNtImpDlls[0].paImports[i].pfnEarlyDummy; + + /* + * Point the other imports at the early init stubs. + */ + for (uint32_t iDll = 1; iDll < RT_ELEMENTS(g_aSupNtImpDlls); iDll++) + for (uint32_t i = 0; i < g_aSupNtImpDlls[iDll].cImports; i++) + if (!g_aSupNtImpDlls[iDll].paImports[i].fOptional) + *g_aSupNtImpDlls[iDll].paImports[i].ppfnImport = g_aSupNtImpDlls[iDll].paImports[i].pfnEarlyDummy; + else + *g_aSupNtImpDlls[iDll].paImports[i].ppfnImport = NULL; +} + + +/** + * Resolves imported functions, esp. system calls from NTDLL. + * + * This crap is necessary because there are sandboxing products out there that + * will mess with system calls we make, just like any other wannabe userland + * rootkit. Kudos to microsoft for not providing a generic system call hook API + * in the kernel mode, which I guess is what forcing these kind of products to + * do ugly userland hacks that doesn't really hold water. + */ +DECLHIDDEN(void) supR3HardenedWinInitImports(void) +{ + RTERRINFOSTATIC ErrInfo; + + /* + * Find the DLLs we will be needing first (forwarders). + */ + for (uint32_t iDll = 0; iDll < RT_ELEMENTS(g_aSupNtImpDlls); iDll++) + { + supR3HardenedFindOrLoadModule(&g_aSupNtImpDlls[iDll]); + if (g_aSupNtImpDlls[iDll].pbImageBase) + supR3HardenedParseModule(&g_aSupNtImpDlls[iDll]); + } + + /* + * Resolve the functions. + */ + for (uint32_t iDll = 0; iDll < RT_ELEMENTS(g_aSupNtImpDlls); iDll++) + for (uint32_t i = 0; i < g_aSupNtImpDlls[iDll].cImports; i++) + { + const char *pszForwarder = supR3HardenedResolveImport(&g_aSupNtImpDlls[iDll], &g_aSupNtImpDlls[iDll].paImports[i], + false); + if (pszForwarder) + { + const char *pszDot = strchr(pszForwarder, '.'); + size_t cchDllName = pszDot - pszForwarder; + SUPHNTIMPFUNC Tmp = g_aSupNtImpDlls[iDll].paImports[i]; + Tmp.pszName = pszDot + 1; + if (cchDllName == sizeof("ntdll") - 1 && RTStrNICmp(pszForwarder, RT_STR_TUPLE("ntdll")) == 0) + supR3HardenedResolveImport(&g_aSupNtImpDlls[0], &Tmp, false); + else if (cchDllName == sizeof("kernelbase") - 1 && RTStrNICmp(pszForwarder, RT_STR_TUPLE("kernelbase")) == 0) + supR3HardenedResolveImport(&g_aSupNtImpDlls[1], &Tmp, false); + else + SUPHNTIMP_ERROR(false, 18, "supR3HardenedWinInitImports", kSupInitOp_Misc, VERR_MODULE_NOT_FOUND, + "%ls: Failed to resolve forwarder '%s'.", g_aSupNtImpDlls[iDll].pwszName, pszForwarder); + } + } + + /* + * Do system calls directly. + */ + supR3HardenedWinInitSyscalls(false, RTErrInfoInitStatic(&ErrInfo)); + + /* + * Use the on disk image to avoid export table patching. Currently + * ignoring errors here as can live normally without this step. + */ + for (uint32_t iDll = 0; iDll < RT_ELEMENTS(g_aSupNtImpDlls); iDll++) + if (g_aSupNtImpDlls[iDll].cPatchedExports > 0) + { + PSUPHNTLDRCACHEENTRY pLdrEntry; + int rc = supHardNtLdrCacheOpen(g_aSupNtImpDlls[iDll].pszName, &pLdrEntry, RTErrInfoInitStatic(&ErrInfo)); + if (RT_SUCCESS(rc)) + { + uint8_t *pbBits; + rc = supHardNtLdrCacheEntryGetBits(pLdrEntry, &pbBits, (uintptr_t)g_aSupNtImpDlls[iDll].pbImageBase, NULL, NULL, + RTErrInfoInitStatic(&ErrInfo)); + if (RT_SUCCESS(rc)) + for (uint32_t i = 0; i < g_aSupNtImpDlls[iDll].cImports; i++) + { + RTLDRADDR uValue; + rc = RTLdrGetSymbolEx(pLdrEntry->hLdrMod, pbBits, (uintptr_t)g_aSupNtImpDlls[iDll].pbImageBase, + UINT32_MAX, g_aSupNtImpDlls[iDll].paImports[i].pszName, &uValue); + if (RT_SUCCESS(rc)) + *g_aSupNtImpDlls[iDll].paImports[i].ppfnImport = (PFNRT)(uintptr_t)uValue; + } + } + } + + +#if 0 /* Win7/32 ntdll!LdrpDebugFlags. */ + *(uint8_t *)&g_aSupNtImpDlls[0].pbImageBase[0xdd770] = 0x3; +#endif +} + + +/** + * Gets the address of a procedure in a DLL, ignoring our own syscall + * implementations. + * + * Currently restricted to NTDLL and KERNEL32 + * + * @returns The procedure address. + * @param pszDll The DLL name. + * @param pszProcedure The procedure name. + */ +DECLHIDDEN(PFNRT) supR3HardenedWinGetRealDllSymbol(const char *pszDll, const char *pszProcedure) +{ + RTERRINFOSTATIC ErrInfo; + + /* + * Look the DLL up in the import DLL table. + */ + for (uint32_t iDll = 0; iDll < RT_ELEMENTS(g_aSupNtImpDlls); iDll++) + if (RTStrICmp(g_aSupNtImpDlls[iDll].pszName, pszDll) == 0) + { + + PSUPHNTLDRCACHEENTRY pLdrEntry; + int rc = supHardNtLdrCacheOpen(g_aSupNtImpDlls[iDll].pszName, &pLdrEntry, RTErrInfoInitStatic(&ErrInfo)); + if (RT_SUCCESS(rc)) + { + uint8_t *pbBits; + rc = supHardNtLdrCacheEntryGetBits(pLdrEntry, &pbBits, (uintptr_t)g_aSupNtImpDlls[iDll].pbImageBase, NULL, NULL, + RTErrInfoInitStatic(&ErrInfo)); + if (RT_SUCCESS(rc)) + { + RTLDRADDR uValue; + rc = RTLdrGetSymbolEx(pLdrEntry->hLdrMod, pbBits, (uintptr_t)g_aSupNtImpDlls[iDll].pbImageBase, + UINT32_MAX, pszProcedure, &uValue); + if (RT_SUCCESS(rc)) + return (PFNRT)(uintptr_t)uValue; + SUP_DPRINTF(("supR3HardenedWinGetRealDllSymbol: Error getting %s in %s -> %Rrc\n", pszProcedure, pszDll, rc)); + } + else + SUP_DPRINTF(("supR3HardenedWinGetRealDllSymbol: supHardNtLdrCacheEntryAllocBits failed on %s: %Rrc %s\n", + pszDll, rc, ErrInfo.Core.pszMsg)); + } + else + SUP_DPRINTF(("supR3HardenedWinGetRealDllSymbol: supHardNtLdrCacheOpen failed on %s: %Rrc %s\n", + pszDll, rc, ErrInfo.Core.pszMsg)); + + /* Complications, just call GetProcAddress. */ + if (g_enmSupR3HardenedMainState >= SUPR3HARDENEDMAINSTATE_WIN_IMPORTS_RESOLVED) + return (PFNRT)GetProcAddress(GetModuleHandleW(g_aSupNtImpDlls[iDll].pwszName), pszProcedure); + return NULL; + } + + supR3HardenedFatal("supR3HardenedWinGetRealDllSymbol: Unknown DLL %s (proc: %s)\n", pszDll, pszProcedure); + /* not reached */ +} + |