Security-55163.44.tar.gz

[apple/security.git] / libsecurity_ssl / lib / ModuleAttacher.c

diff --git a/libsecurity_ssl/lib/ModuleAttacher.c b/libsecurity_ssl/lib/ModuleAttacher.c
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+++ b/libsecurity_ssl/lib/ModuleAttacher.c
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+/*
+ * Copyright (c) 2000-2001,2005-2007,2010-2012 Apple Inc. All Rights Reserved.
+ *
+ * The contents of this file constitute Original Code as defined in and are
+ * subject to the Apple Public Source License Version 1.2 (the 'License').
+ * You may not use this file except in compliance with the License. Please obtain
+ * a copy of the License at http://www.apple.com/publicsource and read it before
+ * using this file.
+ *
+ * This Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
+ * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
+ * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+ * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
+ * specific language governing rights and limitations under the License.
+ */
+
+
+/*
+ * ModuleAttacher.c
+ *
+ * Process-wide class which loads and attaches to {CSP, TP, CL} at most
+ * once, and detaches and unloads the modules when this code is unloaded.
+ */
+
+#include "ssl.h"
+#if USE_CDSA_CRYPTO
+
+#include "ModuleAttacher.h"
+#include "sslDebug.h"
+#include "appleCdsa.h"
+#include <Security/cssmapple.h>
+#include <Security/cssmtype.h>
+#include <Security/cssmapi.h>
+
+#include <pthread.h>
+
+static pthread_mutex_t gAttachLock = PTHREAD_MUTEX_INITIALIZER;
+static CSSM_CSP_HANDLE gCSPHandle = CSSM_INVALID_HANDLE;
+static CSSM_CL_HANDLE gCLHandle = CSSM_INVALID_HANDLE;
+static CSSM_TP_HANDLE gTPHandle = CSSM_INVALID_HANDLE;
+
+static const CSSM_API_MEMORY_FUNCS CA_memFuncs = {
+       stAppMalloc,
+       stAppFree,
+       stAppRealloc,
+       stAppCalloc,
+       NULL
+};
+static const CSSM_VERSION cssmVers = {2, 0};
+static const CSSM_GUID testGuid = { 0xFADE, 0, 0, { 1,2,3,4,5,6,7,0 }};
+
+static CSSM_HANDLE loadModule(
+       CSSM_SERVICE_TYPE svcType,      // CSSM_SERVICE_CSP, etc.
+       const CSSM_GUID *guid,
+       const char *modName)
+{
+       CSSM_RETURN crtn;
+       CSSM_HANDLE hand;
+
+       crtn = CSSM_ModuleLoad(guid,
+               CSSM_KEY_HIERARCHY_NONE,
+               NULL,                   // eventHandler
+               NULL);                  // AppNotifyCallbackCtx
+       if(crtn) {
+               #ifndef NDEBUG
+               sslErrorLog("loadModule: error (%lu) loading %s\n",
+                       (unsigned long)crtn, modName);
+               #endif
+               return CSSM_INVALID_HANDLE;
+       }
+       crtn = CSSM_ModuleAttach (guid,
+               &cssmVers,
+               &CA_memFuncs,                   // memFuncs
+               0,                                              // SubserviceID
+               svcType,                                // SubserviceFlags
+               0,                                              // AttachFlags
+               CSSM_KEY_HIERARCHY_NONE,
+               NULL,                                   // FunctionTable
+               0,                                              // NumFuncTable
+               NULL,                                   // reserved
+               &hand);
+       if(crtn) {
+               #ifndef NDEBUG
+               sslErrorLog("loadModule: error (%lu) attaching to %s\n",
+                       (unsigned long)crtn, modName);
+               #endif
+               return CSSM_INVALID_HANDLE;
+       }
+       return hand;
+}
+
+
+static CSSM_RETURN doAttachToModules(void)
+{
+       CSSM_RETURN  crtn;
+    CSSM_PVC_MODE pvcPolicy = CSSM_PVC_NONE;
+       CSSM_HANDLE cspHandle, clHandle, tpHandle;
+
+       /* Check if we got the lock after some other thread did the
+          initialization. */
+       if (gCSPHandle)
+               return CSSM_OK;
+
+       crtn = CSSM_Init (&cssmVers,
+               CSSM_PRIVILEGE_SCOPE_NONE,
+               &testGuid,
+               CSSM_KEY_HIERARCHY_NONE,
+               &pvcPolicy,
+               NULL /* reserved */);
+       if(crtn != CSSM_OK) {
+               #ifndef NDEBUG
+               sslErrorLog("CSSM_Init returned %lu", (unsigned long)crtn);
+               #endif
+               return crtn;
+       }
+
+       cspHandle = loadModule(CSSM_SERVICE_CSP, &gGuidAppleCSP, "AppleCSP");
+       if (cspHandle == CSSM_INVALID_HANDLE)
+               return CSSMERR_CSSM_ADDIN_LOAD_FAILED;
+       clHandle = loadModule(CSSM_SERVICE_CL, &gGuidAppleX509CL, "AppleCL");
+       if (clHandle == CSSM_INVALID_HANDLE)
+               return CSSMERR_CSSM_ADDIN_LOAD_FAILED;
+       tpHandle = loadModule(CSSM_SERVICE_TP, &gGuidAppleX509TP, "AppleTP");
+       if (tpHandle == CSSM_INVALID_HANDLE)
+               return CSSMERR_CSSM_ADDIN_LOAD_FAILED;
+
+       gCSPHandle = cspHandle;
+       gCLHandle = clHandle;
+       gTPHandle = tpHandle;
+
+       return CSSM_OK;
+}
+
+/* Public C function to load and attach to all three modules. */
+CSSM_RETURN attachToModules(
+       CSSM_CSP_HANDLE         *cspHand,
+       CSSM_CL_HANDLE          *clHand,
+       CSSM_TP_HANDLE          *tpHand)
+{
+       CSSM_RETURN result;
+       if (gCSPHandle && gCLHandle && gTPHandle)
+               result = CSSM_OK;
+       else
+       {
+               pthread_mutex_lock(&gAttachLock);
+               result = doAttachToModules();
+               pthread_mutex_unlock(&gAttachLock);
+       }
+
+       *cspHand = gCSPHandle;
+       *clHand = gCLHandle;
+       *tpHand = gTPHandle;
+
+       return result;
+}
+
+#endif /* USE_CDSA_CRYPTO */
+