DllSecur.c (1894B)
1 /* DllSecur.c -- DLL loading security 2 2016-10-04 : Igor Pavlov : Public domain */ 3 4 #include "Precomp.h" 5 6 #ifdef _WIN32 7 8 #include <windows.h> 9 10 #include "DllSecur.h" 11 12 #ifndef UNDER_CE 13 14 typedef BOOL (WINAPI *Func_SetDefaultDllDirectories)(DWORD DirectoryFlags); 15 16 #define MY_LOAD_LIBRARY_SEARCH_USER_DIRS 0x400 17 #define MY_LOAD_LIBRARY_SEARCH_SYSTEM32 0x800 18 19 static const char * const g_Dlls = 20 #ifndef _CONSOLE 21 "UXTHEME\0" 22 #endif 23 "USERENV\0" 24 "SETUPAPI\0" 25 "APPHELP\0" 26 "PROPSYS\0" 27 "DWMAPI\0" 28 "CRYPTBASE\0" 29 "OLEACC\0" 30 "CLBCATQ\0" 31 ; 32 33 #endif 34 35 void LoadSecurityDlls() 36 { 37 #ifndef UNDER_CE 38 39 wchar_t buf[MAX_PATH + 100]; 40 41 { 42 // at Vista (ver 6.0) : CoCreateInstance(CLSID_ShellLink, ...) doesn't work after SetDefaultDllDirectories() : Check it ??? 43 OSVERSIONINFO vi; 44 vi.dwOSVersionInfoSize = sizeof(vi); 45 if (!GetVersionEx(&vi) || vi.dwMajorVersion != 6 || vi.dwMinorVersion != 0) 46 { 47 Func_SetDefaultDllDirectories setDllDirs = (Func_SetDefaultDllDirectories) 48 GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")), "SetDefaultDllDirectories"); 49 if (setDllDirs) 50 if (setDllDirs(MY_LOAD_LIBRARY_SEARCH_SYSTEM32 | MY_LOAD_LIBRARY_SEARCH_USER_DIRS)) 51 return; 52 } 53 } 54 55 { 56 unsigned len = GetSystemDirectoryW(buf, MAX_PATH + 2); 57 if (len == 0 || len > MAX_PATH) 58 return; 59 } 60 { 61 const char *dll; 62 unsigned pos = (unsigned)lstrlenW(buf); 63 64 if (buf[pos - 1] != '\\') 65 buf[pos++] = '\\'; 66 67 for (dll = g_Dlls; dll[0] != 0;) 68 { 69 unsigned k = 0; 70 for (;;) 71 { 72 char c = *dll++; 73 buf[pos + k] = c; 74 k++; 75 if (c == 0) 76 break; 77 } 78 79 lstrcatW(buf, L".dll"); 80 LoadLibraryExW(buf, NULL, LOAD_WITH_ALTERED_SEARCH_PATH); 81 } 82 } 83 84 #endif 85 } 86 87 #endif