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reactos/dll/appcompat/apphelp/layer.c

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/*
* PROJECT: ReactOS Application compatibility module
* LICENSE: GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
* PURPOSE: Registry layer manipulation functions
* COPYRIGHT: Copyright 2015-2017 Mark Jansen (mark.jansen@reactos.org)
*/
#define WIN32_NO_STATUS
#include "windef.h"
#include "winbase.h"
#include "strsafe.h"
#include <ntndk.h>
#include "apphelp.h"
#define GPLK_USER 1
#define GPLK_MACHINE 2
#define MAX_LAYER_LENGTH 256
#define LAYER_APPLY_TO_SYSTEM_EXES 1
#define LAYER_UNK_FLAG2 2
#ifndef REG_SZ
#define REG_SZ 1
#endif
#if defined(__GNUC__)
#define APPCOMPAT_LAYER_KEY (const WCHAR[]){'\\','S','o','f','t','w','a','r','e','\\','M','i','c','r','o','s','o','f','t','\\','W','i','n','d','o','w','s',' ','N','T','\\','C','u','r','r','e','n','t','V','e','r','s','i','o','n','\\','A','p','p','C','o','m','p','a','t','F','l','a','g','s','\\','L','a','y','e','r','s',0}
#define REGISTRY_MACHINE (const WCHAR[]){'\\','R','e','g','i','s','t','r','y','\\','M','a','c','h','i','n','e',0}
#define SPACE_ONLY (const WCHAR[]){' ',0}
#define DISALLOWED_LAYER_CHARS (const WCHAR[]){' ','#','!',0}
#define LAYER_SEPARATORS (const WCHAR[]){' ','\t',0}
#define SIGN_MEDIA_FMT (const WCHAR[]){'S','I','G','N','.','M','E','D','I','A','=','%','X',' ','%','s',0}
#else
#define APPCOMPAT_LAYER_KEY L"\\Software\\Microsoft\\Windows NT\\CurrentVersion\\AppCompatFlags\\Layers"
#define REGISTRY_MACHINE L"\\Registry\\Machine"
#define SPACE_ONLY L" "
#define DISALLOWED_LAYER_CHARS L" #!"
#define LAYER_SEPARATORS L" \t"
#define SIGN_MEDIA_FMT L"SIGN.MEDIA=%X %s"
#endif
/* Fixme: use RTL_UNICODE_STRING_BUFFER */
typedef struct SDB_TMP_STR
{
UNICODE_STRING Str;
WCHAR FixedBuffer[MAX_PATH];
} SDB_TMP_STR, *PSDB_TMP_STR;
void SdbpInitTempStr(PSDB_TMP_STR String)
{
String->Str.Buffer = String->FixedBuffer;
String->Str.Length = 0;
String->Str.MaximumLength = sizeof(String->FixedBuffer);
}
void SdbpFreeTempStr(PSDB_TMP_STR String)
{
if (String->Str.Buffer != String->FixedBuffer)
{
SdbFree(String->Str.Buffer);
}
}
void SdbpResizeTempStr(PSDB_TMP_STR String, WORD newLength)
{
if (newLength > String->Str.MaximumLength)
{
SdbpFreeTempStr(String);
String->Str.MaximumLength = newLength * sizeof(WCHAR);
String->Str.Buffer = SdbAlloc(String->Str.MaximumLength);
String->Str.Length = 0;
}
}
BOOL SdbpGetLongPathName(PCWSTR wszPath, PSDB_TMP_STR Result)
{
DWORD max = Result->Str.MaximumLength / 2;
DWORD ret = GetLongPathNameW(wszPath, Result->Str.Buffer, max);
if (ret)
{
if (ret >= max)
{
SdbpResizeTempStr(Result, ret);
max = Result->Str.MaximumLength / 2;
ret = GetLongPathNameW(wszPath, Result->Str.Buffer, max);
}
if (ret && ret < max)
{
Result->Str.Length = ret * 2;
return TRUE;
}
}
SHIM_ERR("Failed to convert short path to long path error 0x%lx\n", GetLastError());
return FALSE;
}
BOOL SdbpIsPathOnRemovableMedia(PCWSTR Path)
{
WCHAR tmp[] = { 'A',':','\\',0 };
ULONG type;
if (!Path || Path[0] == UNICODE_NULL)
{
SHIM_ERR("Invalid argument\n");
return FALSE;
}
switch (Path[1])
{
case L':':
break;
case L'\\':
SHIM_INFO("\"%S\" is a network path.\n", Path);
return FALSE;
default:
SHIM_INFO("\"%S\" not a full path we can operate on.\n", Path);
return FALSE;
}
tmp[0] = Path[0];
type = GetDriveTypeW(tmp);
return type == DRIVE_REMOVABLE || type == DRIVE_CDROM;
}
/* Convert a path on removable media to 'SIGN.MEDIA=%X filename' */
BOOL SdbpBuildSignMediaId(PSDB_TMP_STR LongPath)
{
SDB_TMP_STR Scratch;
PWCHAR Ptr;
SdbpInitTempStr(&Scratch);
SdbpResizeTempStr(&Scratch, LongPath->Str.Length / sizeof(WCHAR) + 30);
StringCbCopyNW(Scratch.Str.Buffer, Scratch.Str.MaximumLength, LongPath->Str.Buffer, LongPath->Str.Length);
Ptr = wcsrchr(LongPath->Str.Buffer, '\\');
if (Ptr)
{
HANDLE FindHandle;
WIN32_FIND_DATAW FindData;
Ptr[1] = '*';
Ptr[2] = '\0';
FindHandle = FindFirstFileW(LongPath->Str.Buffer, &FindData);
if (FindHandle != INVALID_HANDLE_VALUE)
{
DWORD SignMedia = 0;
do
{
if (!(FindData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) && FindData.nFileSizeLow)
SignMedia = SignMedia << 1 ^ FindData.nFileSizeLow;
} while (FindNextFileW(FindHandle, &FindData));
FindClose(FindHandle);
SdbpResizeTempStr(LongPath, (LongPath->Str.Length >> 1) + 20);
StringCbPrintfW(LongPath->Str.Buffer, LongPath->Str.MaximumLength, SIGN_MEDIA_FMT, SignMedia, Scratch.Str.Buffer + 3);
LongPath->Str.Length = (USHORT)SdbpStrlen(LongPath->Str.Buffer) * sizeof(WCHAR);
SdbpFreeTempStr(&Scratch);
return TRUE;
}
}
SdbpFreeTempStr(&Scratch);
SdbpFreeTempStr(LongPath);
return FALSE;
}
/* Convert a given path to a long or media path */
BOOL SdbpResolvePath(PSDB_TMP_STR LongPath, PCWSTR wszPath)
{
SdbpInitTempStr(LongPath);
if (!SdbpGetLongPathName(wszPath, LongPath))
{
SdbpFreeTempStr(LongPath);
return FALSE;
}
if (SdbpIsPathOnRemovableMedia(LongPath->Str.Buffer))
{
return SdbpBuildSignMediaId(LongPath);
}
return TRUE;
}
static ACCESS_MASK g_QueryFlag = 0xffffffff;
ACCESS_MASK QueryFlag(void)
{
if (g_QueryFlag == 0xffffffff)
{
ULONG_PTR wow64_ptr = 0;
NTSTATUS Status = NtQueryInformationProcess(NtCurrentProcess(), ProcessWow64Information, &wow64_ptr, sizeof(wow64_ptr), NULL);
g_QueryFlag = (NT_SUCCESS(Status) && wow64_ptr != 0) ? KEY_WOW64_64KEY : 0;
}
return g_QueryFlag;
}
NTSTATUS SdbpOpenKey(PUNICODE_STRING FullPath, BOOL bMachine, ACCESS_MASK Access, PHANDLE KeyHandle)
{
UNICODE_STRING BasePath;
const WCHAR* LayersKey = APPCOMPAT_LAYER_KEY;
OBJECT_ATTRIBUTES ObjectLayer = RTL_INIT_OBJECT_ATTRIBUTES(FullPath, OBJ_CASE_INSENSITIVE);
NTSTATUS Status;
FullPath->Buffer = NULL;
FullPath->Length = FullPath->MaximumLength = 0;
if (bMachine)
{
RtlInitUnicodeString(&BasePath, REGISTRY_MACHINE);
}
else
{
Status = RtlFormatCurrentUserKeyPath(&BasePath);
if (!NT_SUCCESS(Status))
{
SHIM_ERR("Unable to acquire user registry key, Error: 0x%lx\n", Status);
return Status;
}
}
FullPath->MaximumLength = (USHORT)(BasePath.Length + SdbpStrsize(LayersKey));
FullPath->Buffer = SdbAlloc(FullPath->MaximumLength);
FullPath->Length = 0;
RtlAppendUnicodeStringToString(FullPath, &BasePath);
if (!bMachine)
RtlFreeUnicodeString(&BasePath);
RtlAppendUnicodeToString(FullPath, LayersKey);
Status = NtOpenKey(KeyHandle, Access | QueryFlag(), &ObjectLayer);
if (!NT_SUCCESS(Status))
{
SHIM_ERR("Unable to open Key \"%wZ\" Status 0x%lx\n", FullPath, Status);
SdbFree(FullPath->Buffer);
FullPath->Buffer = NULL;
}
return Status;
}
BOOL SdbpGetPermLayersInternal(PUNICODE_STRING FullPath, PWSTR pwszLayers, PDWORD pdwBytes, BOOL bMachine)
{
UNICODE_STRING FullKey;
ULONG ValueBuffer[(MAX_LAYER_LENGTH * sizeof(WCHAR) + sizeof(KEY_VALUE_PARTIAL_INFORMATION) + sizeof(ULONG) - 1) / sizeof(ULONG)];
PKEY_VALUE_PARTIAL_INFORMATION PartialInfo = (PVOID)ValueBuffer;
ULONG Length = 0;
HANDLE KeyHandle;
NTSTATUS Status;
Status = SdbpOpenKey(&FullKey, bMachine, KEY_QUERY_VALUE, &KeyHandle);
if (NT_SUCCESS(Status))
{
Status = NtQueryValueKey(KeyHandle, FullPath, KeyValuePartialInformation, PartialInfo, sizeof(ValueBuffer), &Length);
if (NT_SUCCESS(Status))
{
StringCbCopyNW(pwszLayers, *pdwBytes, (PCWSTR)PartialInfo->Data, PartialInfo->DataLength);
*pdwBytes = PartialInfo->DataLength;
}
else
{
SHIM_INFO("Failed to read value info from Key \"%wZ\" Status 0x%lx\n", &FullKey, Status);
}
NtClose(KeyHandle);
SdbFree(FullKey.Buffer);
}
return NT_SUCCESS(Status);
}
BOOL SdbDeletePermLayerKeys(PCWSTR wszPath, BOOL bMachine)
{
UNICODE_STRING FullKey;
SDB_TMP_STR LongPath;
HANDLE KeyHandle;
NTSTATUS Status;
if (!SdbpResolvePath(&LongPath, wszPath))
return FALSE;
Status = SdbpOpenKey(&FullKey, bMachine, KEY_SET_VALUE, &KeyHandle);
if (NT_SUCCESS(Status))
{
Status = NtDeleteValueKey(KeyHandle, &LongPath.Str);
if (!NT_SUCCESS(Status))
{
SHIM_INFO("Failed to delete value from Key \"%wZ\" Status 0x%lx\n", &FullKey, Status);
/* This is what we want, so if the key didnt exist, we should not fail :) */
if (Status == STATUS_OBJECT_NAME_NOT_FOUND)
Status = STATUS_SUCCESS;
}
NtClose(KeyHandle);
SdbFree(FullKey.Buffer);
}
SdbpFreeTempStr(&LongPath);
return NT_SUCCESS(Status);
}
BOOL SdbpMatchLayer(PCWSTR start, PCWSTR end, PCWSTR compare)
{
size_t len;
if (!end)
return !wcsicmp(start, compare);
len = end - start;
return wcslen(compare) == len && !_wcsnicmp(start, compare, len);
}
BOOL SdbpAppendLayer(PWSTR target, DWORD len, PCWSTR layer, PCWSTR end)
{
NTSTATUS Status = STATUS_SUCCESS;
if (target[0])
Status = StringCbCatW(target, len, SPACE_ONLY);
if (NT_SUCCESS(Status))
{
if (end)
Status = StringCbCatNW(target, len, layer, (end - layer) * sizeof(WCHAR));
else
Status = StringCbCatW(target, len, layer);
}
return NT_SUCCESS(Status);
}
/**
* Determine if we allow permission layers to apply on this file.
*
* @param [in] Path Full pathname of the file, only the drive part is used.
*
* @return TRUE if we allow permission layer, FALSE if not.
*/
BOOL WINAPI AllowPermLayer(PCWSTR Path)
{
WCHAR tmp[] = { 'A',':','\\', 0 };
ULONG type;
if (!Path)
{
SHIM_ERR("Invalid argument\n");
return FALSE;
}
switch (Path[1])
{
case L':':
break;
case L'\\':
SHIM_INFO("\"%S\" is a network path.\n", Path);
return FALSE;
default:
SHIM_INFO("\"%S\" not a full path we can operate on.\n", Path);
return FALSE;
}
tmp[0] = Path[0];
type = GetDriveTypeW(tmp);
if (type == DRIVE_REMOTE)
{
/* The logging here indicates that it does not like a CDROM or removable media, but it only
seems to bail out on a media that reports it is remote...
I have included correct logging, I doubt anyone would parse the logging, so this shouldnt break anything. */
SHIM_INFO("\"%S\" is on a remote drive.\n", Path);
return FALSE;
}
return TRUE;
}
/**
* Read the layers specified for the application.
*
* @param [in] wszPath Full pathname of the file.
* @param [out] pwszLayers On return, the layers set on the file.
* @param pdwBytes The size of the pwszLayers buffer in bytes, and on return the size of
* the data written (in bytes)
* @param [in] dwFlags The flags, [GPLK_USER | GPLK_MACHINE].
*
* @return TRUE if it succeeds, FALSE if it fails.
*/
BOOL WINAPI SdbGetPermLayerKeys(PCWSTR wszPath, PWSTR pwszLayers, PDWORD pdwBytes, DWORD dwFlags)
{
BOOL Result = FALSE;
SDB_TMP_STR LongPath;
DWORD dwBytes, dwTotal = 0;
if (!wszPath || !pdwBytes)
{
SHIM_ERR("NULL parameter passed for wszPath or pdwBytes.\n");
return FALSE;
}
if (!SdbpResolvePath(&LongPath, wszPath))
return FALSE;
dwBytes = *pdwBytes;
if (dwFlags & GPLK_MACHINE)
{
if (SdbpGetPermLayersInternal(&LongPath.Str, pwszLayers, &dwBytes, TRUE))
{
Result = TRUE;
dwTotal = dwBytes - sizeof(WCHAR); /* Compensate for the nullterm. */
pwszLayers += dwTotal / sizeof(WCHAR);
dwBytes = *pdwBytes - dwBytes;
if (dwFlags & GPLK_USER)
{
*(pwszLayers++) = L' ';
*pwszLayers = L'\0';
dwBytes -= sizeof(WCHAR);
dwTotal += sizeof(WCHAR);
}
}
}
if (dwFlags & GPLK_USER)
{
if (SdbpGetPermLayersInternal(&LongPath.Str, pwszLayers, &dwBytes, FALSE))
{
Result = TRUE;
dwTotal += dwBytes - sizeof(WCHAR); /* Compensate for the nullterm. */
}
else if (dwTotal > 0 && pwszLayers[-1] == L' ')
{
pwszLayers[-1] = '\0';
dwTotal -= sizeof(WCHAR);
}
}
if (dwTotal)
dwTotal += sizeof(WCHAR);
*pdwBytes = dwTotal;
SdbpFreeTempStr(&LongPath);
return Result;
}
/**
* Set or clear the Layer key.
*
* @param [in] wszPath Full pathname of the file.
* @param [in] wszLayers The layers to add (space separated), or an empty string / NULL to
* remove all layers.
* @param [in] bMachine TRUE to machine.
*
* @return TRUE if it succeeds, FALSE if it fails.
*/
BOOL WINAPI SdbSetPermLayerKeys(PCWSTR wszPath, PCWSTR wszLayers, BOOL bMachine)
{
UNICODE_STRING FullKey;
SDB_TMP_STR LongPath;
HANDLE KeyHandle;
NTSTATUS Status;
if (!wszLayers || *wszLayers == '\0')
return SdbDeletePermLayerKeys(wszPath, bMachine);
if (!SdbpResolvePath(&LongPath, wszPath))
return FALSE;
Status = SdbpOpenKey(&FullKey, bMachine, KEY_SET_VALUE, &KeyHandle);
if (NT_SUCCESS(Status))
{
Status = NtSetValueKey(KeyHandle, &LongPath.Str, 0, REG_SZ, (PVOID)wszLayers, SdbpStrsize(wszLayers));
if (!NT_SUCCESS(Status))
{
SHIM_INFO("Failed to write a value to Key \"%wZ\" Status 0x%lx\n", &FullKey, Status);
if (Status == STATUS_OBJECT_NAME_NOT_FOUND)
Status = STATUS_SUCCESS;
}
NtClose(KeyHandle);
SdbFree(FullKey.Buffer);
}
SdbpFreeTempStr(&LongPath);
return NT_SUCCESS(Status);
}
/**
* Adds or removes a single layer entry.
*
* @param [in] wszPath Full pathname of the file.
* @param [in] wszLayer The layer to add or remove.
* @param [in] dwFlags Additional flags to add / remove [LAYER_APPLY_TO_SYSTEM_EXES | ???].
* @param [in] bMachine When TRUE, the setting applies to all users, when FALSE only applies
* to the current user.
* @param [in] bEnable TRUE to enable, FALSE to disable a layer / flag specified.
*
* @return TRUE if it succeeds, FALSE if it fails.
*/
BOOL WINAPI SetPermLayerState(PCWSTR wszPath, PCWSTR wszLayer, DWORD dwFlags, BOOL bMachine, BOOL bEnable)
{
WCHAR fullLayer[MAX_LAYER_LENGTH] = { 0 };
WCHAR newLayer[MAX_LAYER_LENGTH] = { 0 };
DWORD dwBytes = sizeof(fullLayer), dwWriteFlags = 0;
PWSTR start, p;
if (!wszLayer)
{
SHIM_ERR("Invalid argument\n");
return FALSE;
}
if (dwFlags & ~(LAYER_APPLY_TO_SYSTEM_EXES | LAYER_UNK_FLAG2))
{
SHIM_ERR("Invalid flags\n");
return FALSE;
}
p = wcspbrk(wszLayer, DISALLOWED_LAYER_CHARS);
if (p)
{
switch (*p)
{
case ' ':
SHIM_ERR("Only one layer can be passed in at a time.\n");
return FALSE;
case '#':
case '!':
SHIM_ERR("Flags cannot be passed in with the layer name.\n");
return FALSE;
}
}
if (!SdbGetPermLayerKeys(wszPath, fullLayer, &dwBytes, bMachine ? GPLK_MACHINE : GPLK_USER))
{
fullLayer[0] = '\0';
dwBytes = sizeof(fullLayer);
}
start = fullLayer;
while (*start == '!' || *start == '#' || *start == ' ' || *start == '\t')
{
if (*start == '#')
dwWriteFlags |= LAYER_APPLY_TO_SYSTEM_EXES;
else if (*start == '!')
dwWriteFlags |= LAYER_UNK_FLAG2;
start++;
}
if (bEnable)
dwWriteFlags |= dwFlags;
else
dwWriteFlags &= ~dwFlags;
p = newLayer;
if (dwWriteFlags & LAYER_UNK_FLAG2)
*(p++) = '!';
if (dwWriteFlags & LAYER_APPLY_TO_SYSTEM_EXES)
*(p++) = '#';
do
{
while (*start == ' ' || *start == '\t')
++start;
if (*start == '\0')
break;
p = wcspbrk(start, LAYER_SEPARATORS);
if (!SdbpMatchLayer(start, p, wszLayer))
{
SdbpAppendLayer(newLayer, sizeof(newLayer), start, p);
}
start = p + 1;
} while (p);
if (bEnable && wszLayer[0])
{
SdbpAppendLayer(newLayer, sizeof(newLayer), wszLayer, NULL);
}
return SdbSetPermLayerKeys(wszPath, newLayer, bMachine);
}
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