Introduced curl_sspi.c and curl_sspi.h for the implementation of functions

Curl_sspi_global_init() and Curl_sspi_global_cleanup() which previously were
named Curl_ntlm_global_init() and Curl_ntlm_global_cleanup() in http_ntlm.c
Also adjusted socks_sspi.c to remove the link-time dependency on the Windows
SSPI library using it now in the same way as it was done in http_ntlm.c.

1 files changed, 119 insertions, 0 deletions

diff --git a/lib/curl_sspi.c b/lib/curl_sspi.c
new file mode 100644
index 000000000..36a498e53
--- /dev/null
+++ b/lib/curl_sspi.c
@@ -0,0 +1,119 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * $Id$
+ ***************************************************************************/
+
+#include "setup.h"
+
+#ifdef USE_WINDOWS_SSPI
+
+#include <curl/curl.h>
+
+#include "curl_sspi.h"
+
+#define _MPRINTF_REPLACE /* use our functions only */
+#include <curl/mprintf.h>
+
+#include "memory.h"
+/* The last #include file should be: */
+#include "memdebug.h"
+
+
+/* Handle of security.dll or secur32.dll, depending on Windows version */
+HMODULE s_hSecDll = NULL;
+
+/* Pointer to SSPI dispatch table */
+PSecurityFunctionTableA s_pSecFn = NULL;
+
+
+/*
+ * Curl_sspi_global_init()
+ *
+ * This is used to load the Security Service Provider Interface (SSPI)
+ * dynamic link library portably across all Windows versions, without
+ * the need to directly link libcurl, nor the application using it, at
+ * build time.
+ *
+ * Once this function has been execured, Windows SSPI functions can be
+ * called through the Security Service Provider Interface dispatch table.
+ */
+
+CURLcode
+Curl_sspi_global_init(void)
+{
+  OSVERSIONINFO osver;
+  INIT_SECURITY_INTERFACE_A pInitSecurityInterface;
+
+  /* If security interface is not yet initialized try to do this */
+  if(s_hSecDll == NULL) {
+
+    /* Find out Windows version */
+    memset(&osver, 0, sizeof(osver));
+    osver.dwOSVersionInfoSize = sizeof(osver);
+    if(! GetVersionEx(&osver))
+      return CURLE_FAILED_INIT;
+
+    /* Security Service Provider Interface (SSPI) functions are located in
+     * security.dll on WinNT 4.0 and in secur32.dll on Win9x. Win2K and XP
+     * have both these DLLs (security.dll forwards calls to secur32.dll) */
+
+    /* Load SSPI dll into the address space of the calling process */
+    if(osver.dwPlatformId == VER_PLATFORM_WIN32_NT
+      && osver.dwMajorVersion == 4)
+      s_hSecDll = LoadLibrary("security.dll");
+    else
+      s_hSecDll = LoadLibrary("secur32.dll");
+    if(! s_hSecDll)
+      return CURLE_FAILED_INIT;
+
+    /* Get address of the InitSecurityInterfaceA function from the SSPI dll */
+    pInitSecurityInterface = (INIT_SECURITY_INTERFACE_A)
+      GetProcAddress(s_hSecDll, "InitSecurityInterfaceA");
+    if(! pInitSecurityInterface)
+      return CURLE_FAILED_INIT;
+
+    /* Get pointer to Security Service Provider Interface dispatch table */
+    s_pSecFn = pInitSecurityInterface();
+    if(! s_pSecFn)
+      return CURLE_FAILED_INIT;
+
+  }
+  return CURLE_OK;
+}
+
+
+/*
+ * Curl_sspi_global_cleanup()
+ *
+ * This deinitializes the Security Service Provider Interface from libcurl.
+ */
+
+void
+Curl_sspi_global_cleanup(void)
+{
+  if(s_hSecDll) {
+    FreeLibrary(s_hSecDll);
+    s_hSecDll = NULL;
+    s_pSecFn = NULL;
+  }
+}
+
+#endif /* USE_WINDOWS_SSPI */