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/* DllSecur.c -- DLL loading security
2016-10-04 : Igor Pavlov : Public domain */
#include "Precomp.h"
#ifdef _WIN32
#include <windows.h>
#include "DllSecur.h"
#ifndef UNDER_CE
typedef BOOL (WINAPI *Func_SetDefaultDllDirectories)(DWORD DirectoryFlags);
#define MY_LOAD_LIBRARY_SEARCH_USER_DIRS 0x400
#define MY_LOAD_LIBRARY_SEARCH_SYSTEM32 0x800
static const char * const g_Dlls =
#ifndef _CONSOLE
"UXTHEME\0"
#endif
"USERENV\0"
"SETUPAPI\0"
"APPHELP\0"
"PROPSYS\0"
"DWMAPI\0"
"CRYPTBASE\0"
"OLEACC\0"
"CLBCATQ\0"
;
#endif
void LoadSecurityDlls()
{
#ifndef UNDER_CE
wchar_t buf[MAX_PATH + 100];
{
// at Vista (ver 6.0) : CoCreateInstance(CLSID_ShellLink, ...) doesn't work after SetDefaultDllDirectories() : Check it ???
OSVERSIONINFO vi;
vi.dwOSVersionInfoSize = sizeof(vi);
if (!GetVersionEx(&vi) || vi.dwMajorVersion != 6 || vi.dwMinorVersion != 0)
{
Func_SetDefaultDllDirectories setDllDirs = (Func_SetDefaultDllDirectories)
GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")), "SetDefaultDllDirectories");
if (setDllDirs)
if (setDllDirs(MY_LOAD_LIBRARY_SEARCH_SYSTEM32 | MY_LOAD_LIBRARY_SEARCH_USER_DIRS))
return;
}
}
{
unsigned len = GetSystemDirectoryW(buf, MAX_PATH + 2);
if (len == 0 || len > MAX_PATH)
return;
}
{
const char *dll;
unsigned pos = (unsigned)lstrlenW(buf);
if (buf[pos - 1] != '\\')
buf[pos++] = '\\';
for (dll = g_Dlls; dll[0] != 0;)
{
unsigned k = 0;
for (;;)
{
char c = *dll++;
buf[pos + k] = c;
k++;
if (c == 0)
break;
}
lstrcatW(buf, L".dll");
LoadLibraryExW(buf, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
}
}
#endif
}
#endif
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