1 /***************************************************************************
2  *                                  _   _ ____  _
3  *  Project                     ___| | | |  _ \| |
4  *                             / __| | | | |_) | |
5  *                            | (__| |_| |  _ <| |___
6  *                             \___|\___/|_| \_\_____|
7  *
8  * Copyright (C) 2016, Steve Holme, <steve_holme@hotmail.com>.
9  *
10  * This software is licensed as described in the file COPYING, which
11  * you should have received as part of this distribution. The terms
12  * are also available at https://curl.haxx.se/docs/copyright.html.
13  *
14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15  * copies of the Software, and permit persons to whom the Software is
16  * furnished to do so, under the terms of the COPYING file.
17  *
18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19  * KIND, either express or implied.
20  *
21  ***************************************************************************/
22 
23 #include "curl_setup.h"
24 
25 #if defined(WIN32)
26 
27 #include <curl/curl.h>
28 #include "system_win32.h"
29 
30 /* The last #include files should be: */
31 #include "curl_memory.h"
32 #include "memdebug.h"
33 
34 #if defined(USE_WINDOWS_SSPI) || (!defined(CURL_DISABLE_TELNET) && \
35                                   defined(USE_WINSOCK))
36 
37 
38 #if !defined(LOAD_WITH_ALTERED_SEARCH_PATH)
39 #define LOAD_WITH_ALTERED_SEARCH_PATH  0x00000008
40 #endif
41 
42 #if !defined(LOAD_LIBRARY_SEARCH_SYSTEM32)
43 #define LOAD_LIBRARY_SEARCH_SYSTEM32   0x00000800
44 #endif
45 
46 /* We use our own typedef here since some headers might lack these */
47 typedef HMODULE (APIENTRY *LOADLIBRARYEX_FN)(LPCTSTR, HANDLE, DWORD);
48 
49 /* See function definitions in winbase.h */
50 #ifdef UNICODE
51 #  ifdef _WIN32_WCE
52 #    define LOADLIBARYEX  L"LoadLibraryExW"
53 #  else
54 #    define LOADLIBARYEX  "LoadLibraryExW"
55 #  endif
56 #else
57 #  define LOADLIBARYEX    "LoadLibraryExA"
58 #endif
59 
60 #endif /* USE_WINDOWS_SSPI || (!CURL_DISABLE_TELNET && USE_WINSOCK) */
61 
62 /*
63  * Curl_verify_windows_version()
64  *
65  * This is used to verify if we are running on a specific windows version.
66  *
67  * Parameters:
68  *
69  * majorVersion [in] - The major version number.
70  * minorVersion [in] - The minor version number.
71  * platform     [in] - The optional platform identifer.
72  * condition    [in] - The test condition used to specifier whether we are
73  *                     checking a version less then, equal to or greater than
74  *                     what is specified in the major and minor version
75  *                     numbers.
76  *
77  * Returns TRUE if matched; otherwise FALSE.
78  */
Curl_verify_windows_version(const unsigned int majorVersion,const unsigned int minorVersion,const PlatformIdentifier platform,const VersionCondition condition)79 bool Curl_verify_windows_version(const unsigned int majorVersion,
80                                  const unsigned int minorVersion,
81                                  const PlatformIdentifier platform,
82                                  const VersionCondition condition)
83 {
84   bool matched = FALSE;
85 
86 #if !defined(_WIN32_WINNT) || !defined(_WIN32_WINNT_WIN2K) || \
87     (_WIN32_WINNT < _WIN32_WINNT_WIN2K)
88   OSVERSIONINFO osver;
89 
90   memset(&osver, 0, sizeof(osver));
91   osver.dwOSVersionInfoSize = sizeof(osver);
92 
93   /* Find out Windows version */
94   if(GetVersionEx(&osver)) {
95     /* Verify the Operating System version number */
96     switch(condition) {
97     case VERSION_LESS_THAN:
98       if(osver.dwMajorVersion < majorVersion ||
99         (osver.dwMajorVersion == majorVersion &&
100          osver.dwMinorVersion < minorVersion))
101         matched = TRUE;
102       break;
103 
104     case VERSION_LESS_THAN_EQUAL:
105       if(osver.dwMajorVersion <= majorVersion &&
106          osver.dwMinorVersion <= minorVersion)
107         matched = TRUE;
108       break;
109 
110     case VERSION_EQUAL:
111       if(osver.dwMajorVersion == majorVersion &&
112          osver.dwMinorVersion == minorVersion)
113         matched = TRUE;
114       break;
115 
116     case VERSION_GREATER_THAN_EQUAL:
117       if(osver.dwMajorVersion >= majorVersion &&
118          osver.dwMinorVersion >= minorVersion)
119         matched = TRUE;
120       break;
121 
122     case VERSION_GREATER_THAN:
123       if(osver.dwMajorVersion > majorVersion ||
124         (osver.dwMajorVersion == majorVersion &&
125          osver.dwMinorVersion > minorVersion))
126         matched = TRUE;
127       break;
128     }
129 
130     /* Verify the platform identifier (if necessary) */
131     if(matched && platform != PLATFORM_DONT_CARE) {
132       switch(platform) {
133       case PLATFORM_WINDOWS:
134         if(osver.dwPlatformId != VER_PLATFORM_WIN32_WINDOWS)
135           matched = FALSE;
136         break;
137 
138       case PLATFORM_WINNT:
139         if(osver.dwPlatformId != VER_PLATFORM_WIN32_NT)
140           matched = FALSE;
141       }
142     }
143   }
144 #else
145   ULONGLONG cm = 0;
146   OSVERSIONINFOEX osver;
147   BYTE majorCondition;
148   BYTE minorCondition;
149   BYTE spMajorCondition;
150   BYTE spMinorCondition;
151 
152   switch(condition) {
153   case VERSION_LESS_THAN:
154     majorCondition = VER_LESS;
155     minorCondition = VER_LESS;
156     spMajorCondition = VER_LESS_EQUAL;
157     spMinorCondition = VER_LESS_EQUAL;
158     break;
159 
160   case VERSION_LESS_THAN_EQUAL:
161     majorCondition = VER_LESS_EQUAL;
162     minorCondition = VER_LESS_EQUAL;
163     spMajorCondition = VER_LESS_EQUAL;
164     spMinorCondition = VER_LESS_EQUAL;
165     break;
166 
167   case VERSION_EQUAL:
168     majorCondition = VER_EQUAL;
169     minorCondition = VER_EQUAL;
170     spMajorCondition = VER_GREATER_EQUAL;
171     spMinorCondition = VER_GREATER_EQUAL;
172     break;
173 
174   case VERSION_GREATER_THAN_EQUAL:
175     majorCondition = VER_GREATER_EQUAL;
176     minorCondition = VER_GREATER_EQUAL;
177     spMajorCondition = VER_GREATER_EQUAL;
178     spMinorCondition = VER_GREATER_EQUAL;
179     break;
180 
181   case VERSION_GREATER_THAN:
182     majorCondition = VER_GREATER;
183     minorCondition = VER_GREATER;
184     spMajorCondition = VER_GREATER_EQUAL;
185     spMinorCondition = VER_GREATER_EQUAL;
186     break;
187 
188   default:
189     return FALSE;
190   }
191 
192   memset(&osver, 0, sizeof(osver));
193   osver.dwOSVersionInfoSize = sizeof(osver);
194   osver.dwMajorVersion = majorVersion;
195   osver.dwMinorVersion = minorVersion;
196   if(platform == PLATFORM_WINDOWS)
197     osver.dwPlatformId = VER_PLATFORM_WIN32_WINDOWS;
198   else if(platform == PLATFORM_WINNT)
199     osver.dwPlatformId = VER_PLATFORM_WIN32_NT;
200 
201   cm = VerSetConditionMask(cm, VER_MAJORVERSION, majorCondition);
202   cm = VerSetConditionMask(cm, VER_MINORVERSION, minorCondition);
203   cm = VerSetConditionMask(cm, VER_SERVICEPACKMAJOR, spMajorCondition);
204   cm = VerSetConditionMask(cm, VER_SERVICEPACKMINOR, spMinorCondition);
205   if(platform != PLATFORM_DONT_CARE)
206     cm = VerSetConditionMask(cm, VER_PLATFORMID, VER_EQUAL);
207 
208   if(VerifyVersionInfo(&osver, (VER_MAJORVERSION | VER_MINORVERSION |
209                                 VER_SERVICEPACKMAJOR | VER_SERVICEPACKMINOR),
210                        cm))
211     matched = TRUE;
212 #endif
213 
214   return matched;
215 }
216 
217 #if defined(USE_WINDOWS_SSPI) || (!defined(CURL_DISABLE_TELNET) && \
218                                   defined(USE_WINSOCK))
219 
220 /*
221  * Curl_load_library()
222  *
223  * This is used to dynamically load DLLs using the most secure method available
224  * for the version of Windows that we are running on.
225  *
226  * Parameters:
227  *
228  * filename  [in] - The filename or full path of the DLL to load. If only the
229  *                  filename is passed then the DLL will be loaded from the
230  *                  Windows system directory.
231  *
232  * Returns the handle of the module on success; otherwise NULL.
233  */
Curl_load_library(LPCTSTR filename)234 HMODULE Curl_load_library(LPCTSTR filename)
235 {
236   HMODULE hModule = NULL;
237   LOADLIBRARYEX_FN pLoadLibraryEx = NULL;
238 
239   /* Get a handle to kernel32 so we can access it's functions at runtime */
240   HMODULE hKernel32 = GetModuleHandle(TEXT("kernel32"));
241   if(!hKernel32)
242     return NULL;
243 
244   /* Attempt to find LoadLibraryEx() which is only available on Windows 2000
245      and above */
246   pLoadLibraryEx = (LOADLIBRARYEX_FN) GetProcAddress(hKernel32, LOADLIBARYEX);
247 
248   /* Detect if there's already a path in the filename and load the library if
249      there is. Note: Both back slashes and forward slashes have been supported
250      since the earlier days of DOS at an API level although they are not
251      supported by command prompt */
252   if(_tcspbrk(filename, TEXT("\\/"))) {
253     /** !checksrc! disable BANNEDFUNC 1 **/
254     hModule = pLoadLibraryEx ?
255       pLoadLibraryEx(filename, NULL, LOAD_WITH_ALTERED_SEARCH_PATH) :
256       LoadLibrary(filename);
257   }
258   /* Detect if KB2533623 is installed, as LOAD_LIBARY_SEARCH_SYSTEM32 is only
259      supported on Windows Vista, Windows Server 2008, Windows 7 and Windows
260      Server 2008 R2 with this patch or natively on Windows 8 and above */
261   else if(pLoadLibraryEx && GetProcAddress(hKernel32, "AddDllDirectory")) {
262     /* Load the DLL from the Windows system directory */
263     hModule = pLoadLibraryEx(filename, NULL, LOAD_LIBRARY_SEARCH_SYSTEM32);
264   }
265   else {
266     /* Attempt to get the Windows system path */
267     UINT systemdirlen = GetSystemDirectory(NULL, 0);
268     if(systemdirlen) {
269       /* Allocate space for the full DLL path (Room for the null terminator
270          is included in systemdirlen) */
271       size_t filenamelen = _tcslen(filename);
272       TCHAR *path = malloc(sizeof(TCHAR) * (systemdirlen + 1 + filenamelen));
273       if(path && GetSystemDirectory(path, systemdirlen)) {
274         /* Calculate the full DLL path */
275         _tcscpy(path + _tcslen(path), TEXT("\\"));
276         _tcscpy(path + _tcslen(path), filename);
277 
278         /* Load the DLL from the Windows system directory */
279         /** !checksrc! disable BANNEDFUNC 1 **/
280         hModule = pLoadLibraryEx ?
281           pLoadLibraryEx(path, NULL, LOAD_WITH_ALTERED_SEARCH_PATH) :
282           LoadLibrary(path);
283 
284       }
285       free(path);
286     }
287   }
288 
289   return hModule;
290 }
291 
292 #endif /* USE_WINDOWS_SSPI || (!CURL_DISABLE_TELNET && USE_WINSOCK) */
293 
294 #endif /* WIN32 */
295