1/***************************************************************************
2 *                                  _   _ ____  _
3 *  Project                     ___| | | |  _ \| |
4 *                             / __| | | | |_) | |
5 *                            | (__| |_| |  _ <| |___
6 *                             \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al.
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 http://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 "setup.h"
24
25#ifdef USE_WINDOWS_SSPI
26
27#include <curl/curl.h>
28
29#include "curl_sspi.h"
30
31#define _MPRINTF_REPLACE /* use our functions only */
32#include <curl/mprintf.h>
33
34#include "curl_memory.h"
35/* The last #include file should be: */
36#include "memdebug.h"
37
38
39/* We use our own typedef here since some headers might lack these */
40typedef PSecurityFunctionTableA (APIENTRY *INITSECURITYINTERFACE_FN_A)(VOID);
41
42/* Handle of security.dll or secur32.dll, depending on Windows version */
43HMODULE s_hSecDll = NULL;
44
45/* Pointer to SSPI dispatch table */
46PSecurityFunctionTableA s_pSecFn = NULL;
47
48
49/*
50 * Curl_sspi_global_init()
51 *
52 * This is used to load the Security Service Provider Interface (SSPI)
53 * dynamic link library portably across all Windows versions, without
54 * the need to directly link libcurl, nor the application using it, at
55 * build time.
56 *
57 * Once this function has been executed, Windows SSPI functions can be
58 * called through the Security Service Provider Interface dispatch table.
59 */
60
61CURLcode
62Curl_sspi_global_init(void)
63{
64  OSVERSIONINFO osver;
65  INITSECURITYINTERFACE_FN_A pInitSecurityInterface;
66
67  /* If security interface is not yet initialized try to do this */
68  if(s_hSecDll == NULL) {
69
70    /* Find out Windows version */
71    memset(&osver, 0, sizeof(osver));
72    osver.dwOSVersionInfoSize = sizeof(osver);
73    if(! GetVersionEx(&osver))
74      return CURLE_FAILED_INIT;
75
76    /* Security Service Provider Interface (SSPI) functions are located in
77     * security.dll on WinNT 4.0 and in secur32.dll on Win9x. Win2K and XP
78     * have both these DLLs (security.dll forwards calls to secur32.dll) */
79
80    /* Load SSPI dll into the address space of the calling process */
81    if(osver.dwPlatformId == VER_PLATFORM_WIN32_NT
82      && osver.dwMajorVersion == 4)
83      s_hSecDll = LoadLibrary("security.dll");
84    else
85      s_hSecDll = LoadLibrary("secur32.dll");
86    if(! s_hSecDll)
87      return CURLE_FAILED_INIT;
88
89    /* Get address of the InitSecurityInterfaceA function from the SSPI dll */
90    pInitSecurityInterface = (INITSECURITYINTERFACE_FN_A)
91      GetProcAddress(s_hSecDll, "InitSecurityInterfaceA");
92    if(! pInitSecurityInterface)
93      return CURLE_FAILED_INIT;
94
95    /* Get pointer to Security Service Provider Interface dispatch table */
96    s_pSecFn = pInitSecurityInterface();
97    if(! s_pSecFn)
98      return CURLE_FAILED_INIT;
99
100  }
101  return CURLE_OK;
102}
103
104
105/*
106 * Curl_sspi_global_cleanup()
107 *
108 * This deinitializes the Security Service Provider Interface from libcurl.
109 */
110
111void
112Curl_sspi_global_cleanup(void)
113{
114  if(s_hSecDll) {
115    FreeLibrary(s_hSecDll);
116    s_hSecDll = NULL;
117    s_pSecFn = NULL;
118  }
119}
120
121#endif /* USE_WINDOWS_SSPI */
122