Sandboxie/Sandboxie/core/dll/handle.c

272 lines
8.1 KiB
C

/*
* Copyright 2021-2022 David Xanatos, xanasoft.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
//---------------------------------------------------------------------------
// Handle
//---------------------------------------------------------------------------
#define NOGDI
#include "dll.h"
#include "handle.h"
#include <stdio.h>
#include "debug.h"
#include "common/pool.h"
#include "common/map.h"
//---------------------------------------------------------------------------
// Structures and Types
//---------------------------------------------------------------------------
typedef struct _HANDLE_STATE {
BOOLEAN DeleteOnClose;
P_CloseHandler CloseHandlers[MAX_CLOSE_HANDLERS];
WCHAR* RelocationPath;
} HANDLE_STATE;
//---------------------------------------------------------------------------
// Variables
//---------------------------------------------------------------------------
extern POOL* Dll_Pool;
static HASH_MAP Handle_StatusData;
static CRITICAL_SECTION Handle_StatusData_CritSec;
//---------------------------------------------------------------------------
// Functions
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
// Handle_Init
//---------------------------------------------------------------------------
_FX BOOLEAN Handle_Init(void)
{
InitializeCriticalSection(&Handle_StatusData_CritSec);
map_init(&Handle_StatusData, Dll_Pool);
return TRUE;
}
//---------------------------------------------------------------------------
// Handle_SetDeleteOnClose
//---------------------------------------------------------------------------
_FX VOID Handle_SetDeleteOnClose(HANDLE FileHandle, BOOLEAN DeleteOnClose)
{
EnterCriticalSection(&Handle_StatusData_CritSec);
HANDLE_STATE* state = map_get(&Handle_StatusData, FileHandle);
if (!state) {
state = map_insert(&Handle_StatusData, FileHandle, NULL, sizeof(HANDLE_STATE));
}
state->DeleteOnClose = DeleteOnClose;
LeaveCriticalSection(&Handle_StatusData_CritSec);
}
//---------------------------------------------------------------------------
// Handle_SetRelocationPath
//---------------------------------------------------------------------------
_FX VOID Handle_SetRelocationPath(HANDLE FileHandle, WCHAR* RelocationPath)
{
EnterCriticalSection(&Handle_StatusData_CritSec);
HANDLE_STATE* state = map_get(&Handle_StatusData, FileHandle);
if (!state) { // this shoudl always be the case, as we only use Handle_SetRelocationPath when the handle is first created
state = map_insert(&Handle_StatusData, FileHandle, NULL, sizeof(HANDLE_STATE));
} else if (state->RelocationPath) Dll_Free(state->RelocationPath); // should not happen but in case
state->RelocationPath = Dll_Alloc((wcslen(RelocationPath) + 1) * sizeof(WCHAR));
wcscpy(state->RelocationPath, RelocationPath);
LeaveCriticalSection(&Handle_StatusData_CritSec);
}
//---------------------------------------------------------------------------
// Handle_GetRelocationPath
//---------------------------------------------------------------------------
_FX WCHAR* Handle_GetRelocationPath(HANDLE FileHandle, ULONG ExtraLength)
{
WCHAR* name = NULL;
EnterCriticalSection(&Handle_StatusData_CritSec);
HANDLE_STATE* state = map_get(&Handle_StatusData, FileHandle);
if (state && state->RelocationPath) {
THREAD_DATA *TlsData = Dll_GetTlsData(NULL);
ULONG length = (wcslen(state->RelocationPath) + 1) * sizeof(WCHAR);
name = Dll_GetTlsNameBuffer(TlsData, TRUE_NAME_BUFFER, length + ExtraLength);
wcscpy(name, state->RelocationPath);
}
LeaveCriticalSection(&Handle_StatusData_CritSec);
return name;
}
//---------------------------------------------------------------------------
// Handle_FreeCloseHandler
//---------------------------------------------------------------------------
_FX BOOLEAN Handle_FreeCloseHandler(HANDLE FileHandle, P_CloseHandler* CloseHandlers, BOOLEAN* DeleteOnClose)
{
BOOLEAN HasCloseHandlers = FALSE;
EnterCriticalSection(&Handle_StatusData_CritSec);
HANDLE_STATE* state = (HANDLE_STATE*)map_get(&Handle_StatusData, FileHandle);
if (state) {
HasCloseHandlers = TRUE;
if(CloseHandlers)
memcpy(CloseHandlers, state->CloseHandlers, MAX_CLOSE_HANDLERS * sizeof(P_CloseHandler));
if(DeleteOnClose) *DeleteOnClose = state->DeleteOnClose;
if (state->RelocationPath) Dll_Free(state->RelocationPath);
}
map_remove(&Handle_StatusData, FileHandle);
LeaveCriticalSection(&Handle_StatusData_CritSec);
return HasCloseHandlers;
}
//---------------------------------------------------------------------------
// Handle_RegisterCloseHandler
//---------------------------------------------------------------------------
_FX BOOLEAN Handle_RegisterCloseHandler(HANDLE FileHandle, P_CloseHandler CloseHandler)
{
if (!FileHandle || FileHandle == (HANDLE)-1)
return FALSE;
ULONG i;
EnterCriticalSection(&Handle_StatusData_CritSec);
HANDLE_STATE* state = map_get(&Handle_StatusData, FileHandle);
if (!state) {
state = map_insert(&Handle_StatusData, FileHandle, NULL, sizeof(HANDLE_STATE));
}
for (i = 0; i < MAX_CLOSE_HANDLERS; i++) {
if (state->CloseHandlers[i] == CloseHandler)
break; // already registered
if (state->CloseHandlers[i] == NULL) {
state->CloseHandlers[i] = CloseHandler; // set to empty slot
break;
}
}
LeaveCriticalSection(&Handle_StatusData_CritSec);
if (i == MAX_CLOSE_HANDLERS) {
SbieApi_Log(2301, L"No free CloseHandlers slot available");
return FALSE;
}
return TRUE;
}
//---------------------------------------------------------------------------
// Handle_UnRegisterCloseHandler
//---------------------------------------------------------------------------
_FX BOOLEAN Handle_UnRegisterCloseHandler(HANDLE FileHandle, P_CloseHandler CloseHandler)
{
ULONG i = MAX_CLOSE_HANDLERS;
EnterCriticalSection(&Handle_StatusData_CritSec);
HANDLE_STATE* state = map_get(&Handle_StatusData, FileHandle);
if (state) {
for (i = 0; i < MAX_CLOSE_HANDLERS; i++) {
if (state->CloseHandlers[i] == CloseHandler) {
state->CloseHandlers[i] = NULL; // clear slot
break;
}
}
}
LeaveCriticalSection(&Handle_StatusData_CritSec);
return i != MAX_CLOSE_HANDLERS;
}
//---------------------------------------------------------------------------
// Handle_SetupDuplicate
//---------------------------------------------------------------------------
_FX void Handle_SetupDuplicate(HANDLE OldFileHandle, HANDLE NewFileHandle)
{
ULONG i;
EnterCriticalSection(&Handle_StatusData_CritSec);
HANDLE_STATE* state = map_get(&Handle_StatusData, OldFileHandle);
if (state) {
if(state->RelocationPath)
Handle_SetRelocationPath(NewFileHandle, state->RelocationPath);
// todo: add a flag to each CloseHandlers entry to indicate if it should be propagated or not
BOOLEAN found = FALSE;
for (i = 0; i < MAX_CLOSE_HANDLERS; i++) {
if (state->CloseHandlers[i] == File_NotifyRecover) {
found = TRUE;
break;
}
}
if(found)
Handle_RegisterCloseHandler(NewFileHandle, File_NotifyRecover);
}
LeaveCriticalSection(&Handle_StatusData_CritSec);
}