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109 lines
2.4 KiB
C
109 lines
2.4 KiB
C
/* DllSecur.c -- DLL loading security
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2018-02-21 : Igor Pavlov : Public domain */
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#include "Precomp.h"
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#ifdef _WIN32
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#include <windows.h>
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#include "DllSecur.h"
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#ifndef UNDER_CE
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typedef BOOL (WINAPI *Func_SetDefaultDllDirectories)(DWORD DirectoryFlags);
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#define MY_LOAD_LIBRARY_SEARCH_USER_DIRS 0x400
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#define MY_LOAD_LIBRARY_SEARCH_SYSTEM32 0x800
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static const char * const g_Dlls =
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#ifndef _CONSOLE
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"UXTHEME\0"
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#endif
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"USERENV\0"
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"SETUPAPI\0"
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"APPHELP\0"
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"PROPSYS\0"
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"DWMAPI\0"
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"CRYPTBASE\0"
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"OLEACC\0"
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"CLBCATQ\0"
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"VERSION\0"
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;
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#endif
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void My_SetDefaultDllDirectories()
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{
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#ifndef UNDER_CE
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OSVERSIONINFO vi;
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vi.dwOSVersionInfoSize = sizeof(vi);
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GetVersionEx(&vi);
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if (!GetVersionEx(&vi) || vi.dwMajorVersion != 6 || vi.dwMinorVersion != 0)
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{
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Func_SetDefaultDllDirectories setDllDirs = (Func_SetDefaultDllDirectories)
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GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")), "SetDefaultDllDirectories");
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if (setDllDirs)
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if (setDllDirs(MY_LOAD_LIBRARY_SEARCH_SYSTEM32 | MY_LOAD_LIBRARY_SEARCH_USER_DIRS))
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return;
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}
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#endif
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}
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void LoadSecurityDlls()
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{
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#ifndef UNDER_CE
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wchar_t buf[MAX_PATH + 100];
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{
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// at Vista (ver 6.0) : CoCreateInstance(CLSID_ShellLink, ...) doesn't work after SetDefaultDllDirectories() : Check it ???
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OSVERSIONINFO vi;
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vi.dwOSVersionInfoSize = sizeof(vi);
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if (!GetVersionEx(&vi) || vi.dwMajorVersion != 6 || vi.dwMinorVersion != 0)
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{
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Func_SetDefaultDllDirectories setDllDirs = (Func_SetDefaultDllDirectories)
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GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")), "SetDefaultDllDirectories");
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if (setDllDirs)
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if (setDllDirs(MY_LOAD_LIBRARY_SEARCH_SYSTEM32 | MY_LOAD_LIBRARY_SEARCH_USER_DIRS))
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return;
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}
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}
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{
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unsigned len = GetSystemDirectoryW(buf, MAX_PATH + 2);
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if (len == 0 || len > MAX_PATH)
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return;
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}
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{
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const char *dll;
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unsigned pos = (unsigned)lstrlenW(buf);
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if (buf[pos - 1] != '\\')
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buf[pos++] = '\\';
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for (dll = g_Dlls; dll[0] != 0;)
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{
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unsigned k = 0;
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for (;;)
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{
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char c = *dll++;
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buf[pos + k] = (Byte)c;
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k++;
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if (c == 0)
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break;
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}
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lstrcatW(buf, L".dll");
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LoadLibraryExW(buf, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
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}
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}
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#endif
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}
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#endif
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