Rename to p11-kit.

A less pretentios, better description of what's going on.

1 files changed, 1974 insertions, 0 deletions

diff --git a/module/p11-kit.c b/module/p11-kit.c
new file mode 100644
index 0000000..ddce209
--- /dev/null
+++ b/module/p11-kit.c
@@ -0,0 +1,1974 @@
+/*
+ * Copyright (C) 2011 Collabora Ltd.
+ * Copyright (C) 2008 Stefan Walter
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *     * Redistributions of source code must retain the above
+ *       copyright notice, this list of conditions and the
+ *       following disclaimer.
+ *     * Redistributions in binary form must reproduce the
+ *       above copyright notice, this list of conditions and
+ *       the following disclaimer in the documentation and/or
+ *       other materials provided with the distribution.
+ *     * The names of contributors to this software may not be
+ *       used to endorse or promote products derived from this
+ *       software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * Author: Stef Walter <stefw@collabora.co.uk>
+ */
+
+#include "config.h"
+
+#include "hash.h"
+#include "pkcs11.h"
+#include "p11-kit.h"
+
+#include <sys/types.h>
+#include <assert.h>
+#include <dirent.h>
+#include <dlfcn.h>
+#include <errno.h>
+#include <pthread.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+/* Start wrap slots slightly higher for testing */
+#define MAPPING_OFFSET 0x10
+#define FIRST_HANDLE   0x10
+
+typedef struct _Mapping {
+	CK_SLOT_ID wrap_slot;
+	CK_SLOT_ID real_slot;
+	CK_FUNCTION_LIST_PTR funcs;
+} Mapping;
+
+typedef struct _Session {
+	CK_SESSION_HANDLE wrap_session;
+	CK_SESSION_HANDLE real_session;
+	CK_SLOT_ID wrap_slot;
+} Session;
+
+typedef struct _Module {
+	char *name;
+	char *path;
+	void *dl_module;
+	CK_FUNCTION_LIST_PTR funcs;
+	int ref_count;
+	int initialize_count;
+	struct _Module *next;
+} Module;
+
+/* Forward declaration */
+static CK_FUNCTION_LIST proxy_function_list;
+
+/*
+ * This is the mutex that protects the global data of this library
+ * and the pkcs11 proxy module. Note that we *never* call into our
+ * underlying pkcs11 modules while holding this mutex. Therefore it
+ * doesn't have to be recursive and we can keep things simple.
+ */
+static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+
+/*
+ * Shared data between threads, protected by the mutex, a structure so
+ * we can audit thread safety easier.
+ */
+static struct _Shared {
+	Mapping *mappings;
+	unsigned int n_mappings;
+	hsh_t *sessions;
+	Module *modules;
+	CK_ULONG last_handle;
+	int registered_loaded;
+} gl = { NULL, 0, NULL, NULL, FIRST_HANDLE, 0 };
+
+#define MANUFACTURER_ID         "PKCS#11 Kit                     "
+#define LIBRARY_DESCRIPTION     "PKCS#11 Kit Proxy Module        "
+#define LIBRARY_VERSION_MAJOR   1
+#define LIBRARY_VERSION_MINOR   1
+
+/* -----------------------------------------------------------------------------
+ * UTILITIES
+ */
+
+static void
+warning (const char* msg, ...)
+{
+	char buffer[512];
+	va_list va;
+
+	va_start (va, msg);
+
+	vsnprintf(buffer, sizeof (buffer) - 1, msg, va);
+	buffer[sizeof (buffer) - 1] = 0;
+	fprintf (stderr, "p11-kit: %s\n", buffer);
+
+	va_end (va);
+}
+
+static char*
+strconcat (const char *first, ...)
+{
+	size_t length = 0;
+	const char *arg;
+	char *result, *at;
+	va_list va;
+
+	va_start (va, first);
+
+	for (arg = first; arg; arg = va_arg (va, const char*))
+		length += strlen (arg);
+
+	va_end (va);
+
+	at = result = malloc (length);
+	if (!result)
+		return NULL;
+
+	va_start (va, first);
+
+	for (arg = first; arg; arg = va_arg (va, const char*)) {
+		length = strlen (arg);
+		memcpy (at, arg, length);
+		at += length;
+	}
+
+	va_end (va);
+
+	*at = 0;
+	return result;
+}
+
+static int
+ends_with (const char *haystack, const char *needle)
+{
+	size_t haystack_len, needle_len;
+
+	assert (haystack);
+	assert (needle);
+
+	haystack_len = strlen (haystack);
+	needle_len = strlen (needle);
+
+	if (needle_len > haystack_len)
+		return 0;
+	return memcmp (haystack + (haystack_len - needle_len),
+	               needle, needle_len) == 0;
+}
+
+static void*
+xrealloc (void * memory, size_t length)
+{
+	void *allocated = realloc (memory, length);
+	if (!allocated)
+		free (memory);
+	return allocated;
+}
+
+/* -----------------------------------------------------------------------------
+ * P11-KIT FUNCTIONALITY
+ */
+
+static CK_RV
+load_module_unlocked (const char *name, Module *module)
+{
+	CK_C_GetFunctionList gfl;
+	CK_RV rv;
+
+	/*
+	 * TODO: This function will change significantly once we're loading
+	 * from a config, see below.
+	 */
+	assert (name);
+	assert (module);
+
+	module->name = strdup (name);
+	if (!module->name)
+		return CKR_HOST_MEMORY;
+
+	module->path = strconcat (PKCS11_MODULE_PATH, "/", name, NULL);
+	if (!module->path)
+		return CKR_HOST_MEMORY;
+
+	module->dl_module = dlopen (module->path, RTLD_LOCAL | RTLD_NOW);
+	if (module->dl_module == NULL) {
+		warning ("couldn't load module: %s: %s",
+		         module->path, dlerror ());
+		return CKR_GENERAL_ERROR;
+	}
+
+	gfl = dlsym (module->dl_module, "C_GetFunctionList");
+	if (!gfl) {
+		warning ("couldn't find C_GetFunctionList entry point in module: %s: %s",
+		         module->path, dlerror ());
+		return CKR_GENERAL_ERROR;
+	}
+
+	rv = gfl (&module->funcs);
+	if (rv != CKR_OK) {
+		warning ("call to C_GetFunctiontList failed in module: %s: %lu",
+		         module->path, (unsigned long)rv);
+		return rv;
+	}
+
+	return CKR_OK;
+}
+
+static void
+unload_module_unlocked (Module *module)
+{
+	assert (module);
+
+	/* Should have been finalized before this */
+	assert (!module->initialize_count);
+
+	if (module->dl_module) {
+		dlclose (module->dl_module);
+		module->dl_module = NULL;
+	}
+
+	free (module->path);
+	module->path = NULL;
+
+	free (module->name);
+	module->name = NULL;
+
+	module->funcs = NULL;
+}
+
+static CK_RV
+load_registered_modules_unlocked (void)
+{
+	struct dirent *dp;
+	Module *module;
+	DIR *dir;
+	CK_RV rv;
+
+	/* First we load all the modules */
+	dir = opendir (PKCS11_MODULE_PATH);
+
+	/* We're within a global mutex, so readdir is safe */
+	while ((dp = readdir(dir)) != NULL) {
+		if ((dp->d_type == DT_LNK || dp->d_type == DT_REG) &&
+		    !ends_with (dp->d_name, ".la")) {
+
+			module = calloc (sizeof (Module), 1);
+			if (!module)
+				rv = CKR_HOST_MEMORY;
+			else
+				rv = load_module_unlocked (dp->d_name, module);
+
+			/* Cleanup for failures happens at caller */
+			module->next = gl.modules;
+			gl.modules = module;
+
+			if (rv != CKR_OK)
+				break;
+		}
+	}
+
+	closedir (dir);
+
+	return rv;
+}
+
+static CK_RV
+create_mutex (CK_VOID_PTR_PTR mut)
+{
+	pthread_mutex_t *pmutex;
+	int err;
+
+	pmutex = malloc (sizeof (pthread_mutex_t));
+	if (!pmutex)
+		return CKR_HOST_MEMORY;
+	err = pthread_mutex_init (pmutex, NULL);
+	if (err == ENOMEM)
+		return CKR_HOST_MEMORY;
+	else if (err != 0)
+		return CKR_GENERAL_ERROR;
+	*mut = pmutex;
+	return CKR_OK;
+}
+
+static CK_RV
+destroy_mutex (CK_VOID_PTR mut)
+{
+	pthread_mutex_t *pmutex = mut;
+	int err;
+
+	err = pthread_mutex_destroy (pmutex);
+	if (err == EINVAL)
+		return CKR_MUTEX_BAD;
+	else if (err != 0)
+		return CKR_GENERAL_ERROR;
+	free (pmutex);
+	return CKR_OK;
+}
+
+static CK_RV
+lock_mutex (CK_VOID_PTR mut)
+{
+	pthread_mutex_t *pmutex = mut;
+	int err;
+
+	err = pthread_mutex_lock (pmutex);
+	if (err == EINVAL)
+		return CKR_MUTEX_BAD;
+	else if (err != 0)
+		return CKR_GENERAL_ERROR;
+	return CKR_OK;
+}
+
+static CK_RV
+unlock_mutex (CK_VOID_PTR mut)
+{
+	pthread_mutex_t *pmutex = mut;
+	int err;
+
+	err = pthread_mutex_unlock (pmutex);
+	if (err == EINVAL)
+		return CKR_MUTEX_BAD;
+	else if (err == EPERM)
+		return CKR_MUTEX_NOT_LOCKED;
+	else if (err != 0)
+		return CKR_GENERAL_ERROR;
+	return CKR_OK;
+}
+
+static CK_RV
+initialize_module_unlocked_reentrant (Module *module, CK_C_INITIALIZE_ARGS_PTR args)
+{
+	CK_RV rv = CKR_OK;
+
+	assert (module);
+
+	/*
+	 * Initialize first, so module doesn't get freed out from
+	 * underneath us when the mutex is unlocked below.
+	 */
+	++module->ref_count;
+
+	if (!module->initialize_count) {
+
+		pthread_mutex_unlock (&mutex);
+
+			assert (module->funcs);
+			rv = module->funcs->C_Initialize (args);
+
+		pthread_mutex_lock (&mutex);
+
+		/*
+		 * Because we have the mutex unlocked above, two initializes could
+		 * race. Therefore we need to take CKR_CRYPTOKI_ALREADY_INITIALIZED
+		 * into account.
+		 *
+		 * We also need to take into account where in a race both calls return
+		 * CKR_OK (which is not according to the spec but may happen, I mean we
+		 * do it in this module, so it's not unimaginable).
+		 */
+
+		if (rv == CKR_OK)
+			++module->initialize_count;
+		else if (rv == CKR_CRYPTOKI_ALREADY_INITIALIZED)
+			rv = CKR_OK;
+		else
+			--module->ref_count;
+	}
+
+	return rv;
+}
+
+static CK_RV
+finalize_module_unlocked_reentrant (Module *module, CK_VOID_PTR args)
+{
+	Module *mod, *next;
+
+	assert (module);
+
+	/*
+	 * We leave module info around until all are finalized
+	 * so we can encounter these zombie Module structures.
+	 */
+	if (module->ref_count == 0)
+		return CKR_ARGUMENTS_BAD;
+
+	if (--module->ref_count > 0)
+		return CKR_OK;
+
+	/*
+	 * Becuase of the mutex unlock below, we temporarily increase
+	 * the ref count. This prevents module from being freed out
+	 * from ounder us.
+	 */
+	++module->ref_count;
+
+	while (module->initialize_count > 0) {
+
+		pthread_mutex_unlock (&mutex);
+
+			assert (module->funcs);
+			module->funcs->C_Finalize (args);
+
+		pthread_mutex_lock (&mutex);
+
+		if (module->initialize_count > 0)
+			--module->initialize_count;
+	}
+
+	/* Match the increment above */
+	--module->ref_count;
+
+	/* Check if any modules have a ref count */
+	for (mod = gl.modules; mod; mod = mod->next) {
+		if (mod->ref_count)
+			break;
+	}
+
+	/* No modules had a refcount? unload and free all info */
+	if (mod == NULL) {
+		for (mod = gl.modules; mod; mod = next) {
+			next = mod->next;
+			unload_module_unlocked (mod);
+			free (mod);
+		}
+		gl.modules = NULL;
+		gl.registered_loaded = 0;
+	}
+
+	return CKR_OK;
+}
+
+static Module*
+find_module_for_funcs_unlocked (CK_FUNCTION_LIST_PTR funcs)
+{
+	Module *module;
+
+	assert (funcs);
+
+	for (module = gl.modules; module; module = module->next)
+		if (module->ref_count && module->funcs == funcs)
+			return module;
+	return NULL;
+}
+
+static Module*
+find_module_for_name_unlocked (const char *name)
+{
+	Module *module;
+
+	assert (name);
+
+	for (module = gl.modules; module; module = module->next)
+		if (module->ref_count && module->name && strcmp (name, module->name))
+			return module;
+	return NULL;
+}
+
+static CK_RV
+initialize_registered_unlocked_reentrant (CK_C_INITIALIZE_ARGS_PTR args)
+{
+	Module *module;
+	CK_RV rv;
+
+	rv = load_registered_modules_unlocked ();
+	if (rv == CKR_OK) {
+		for (module = gl.modules; module; module = module->next) {
+
+			/* Skip all modules that aren't registered */
+			if (!module->name)
+				continue;
+
+			rv = initialize_module_unlocked_reentrant (module, args);
+
+			if (rv != CKR_OK)
+				break;
+		}
+	}
+
+	return rv;
+}
+
+CK_RV
+p11_kit_initialize_registered (void)
+{
+	CK_C_INITIALIZE_ARGS args;
+	CK_RV rv;
+
+	/* WARNING: This function must be reentrant */
+
+	memset (&args, 0, sizeof (args));
+	args.CreateMutex = create_mutex;
+	args.DestroyMutex = destroy_mutex;
+	args.LockMutex = lock_mutex;
+	args.UnlockMutex = unlock_mutex;
+	args.flags = CKF_OS_LOCKING_OK;
+
+	pthread_mutex_lock (&mutex);
+
+		/* WARNING: Reentrancy can occur here */
+		rv = initialize_registered_unlocked_reentrant (&args);
+
+	pthread_mutex_unlock (&mutex);
+
+	/* Cleanup any partial initialization */
+	if (rv != CKR_OK)
+		p11_kit_finalize_registered ();
+
+	return rv;
+}
+
+static CK_RV
+finalize_registered_unlocked_reentrant (CK_VOID_PTR args)
+{
+	Module *module;
+
+	/* WARNING: This function must be reentrant */
+
+	for (module = gl.modules; module; module = module->next) {
+
+		/* Skip all modules that aren't registered */
+		if (!module->name)
+			continue;
+
+		/* WARNING: Reentrant calls can occur here */
+		finalize_module_unlocked_reentrant (module, args);
+	}
+
+	return CKR_OK;
+}
+CK_RV
+p11_kit_finalize_registered (void)
+{
+	CK_RV rv;
+
+	/* WARNING: This function must be reentrant */
+
+	pthread_mutex_lock (&mutex);
+
+		/* WARNING: Reentrant calls can occur here */
+		rv = finalize_registered_unlocked_reentrant (NULL);
+
+	pthread_mutex_unlock (&mutex);
+
+	return rv;
+}
+
+char**
+p11_kit_registered_names (void)
+{
+	Module *module;
+	char **result;
+	int count, i;
+
+	pthread_mutex_lock (&mutex);
+
+		for (module = gl.modules, count = 0;
+		     module; module = module->next)
+			++count;
+		result = calloc (count + 1, sizeof (char*));
+		if (result) {
+			for (module = gl.modules, i = 0;
+			     module; module = module->next, ++i)
+				result[i] = strdup (module->name);
+		}
+
+	pthread_mutex_unlock (&mutex);
+
+	return result;
+}
+
+CK_FUNCTION_LIST_PTR
+p11_kit_registered_module (const char *module_name)
+{
+	CK_FUNCTION_LIST_PTR result;
+	Module *module;
+
+	if (!module_name)
+		return NULL;
+
+	pthread_mutex_lock (&mutex);
+
+		module = find_module_for_name_unlocked (module_name);
+		if (module) {
+			assert (module);
+			result = module->funcs;
+		}
+
+	pthread_mutex_unlock (&mutex);
+
+	return result;
+}
+
+void
+p11_kit_free_names (char **module_names)
+{
+	char **name;
+	for (name = module_names; *name; ++name)
+		free (name);
+}
+
+char*
+p11_kit_registered_option (const char *module_name, const char *field)
+{
+	/* TODO: Need to implement */
+	assert (0);
+	return NULL;
+}
+
+CK_RV
+p11_kit_initialize_module (CK_FUNCTION_LIST_PTR funcs, CK_C_INITIALIZE_ARGS_PTR init_args)
+{
+	Module *module;
+	Module *allocated = NULL;
+	CK_RV rv = CKR_OK;
+
+	/* WARNING: This function must be reentrant for the same arguments */
+
+	pthread_mutex_lock (&mutex);
+
+		module = find_module_for_funcs_unlocked (funcs);
+		if (module == NULL) {
+			allocated = module = calloc (1, sizeof (Module));
+			module->name = NULL;
+			module->dl_module = NULL;
+			module->path = NULL;
+			module->funcs = funcs;
+		}
+
+		/* WARNING: Reentrancy can occur here */
+		rv = initialize_module_unlocked_reentrant (module, init_args);
+
+		/* If this was newly allocated, add it to the list */
+		if (rv == CKR_OK && allocated) {
+			allocated->next = gl.modules;
+			gl.modules = allocated;
+			allocated = NULL;
+		}
+
+		free (allocated);
+
+	pthread_mutex_unlock (&mutex);
+
+	return rv;
+}
+
+CK_RV
+p11_kit_finalize_module (CK_FUNCTION_LIST_PTR funcs, CK_VOID_PTR reserved)
+{
+	Module *module;
+	CK_RV rv = CKR_OK;
+
+	/* WARNING: This function must be reentrant for the same arguments */
+
+	pthread_mutex_lock (&mutex);
+
+		module = find_module_for_funcs_unlocked (funcs);
+		if (module == NULL) {
+			rv = CKR_ARGUMENTS_BAD;
+		} else {
+			/* WARNING: Rentrancy can occur here */
+			rv = finalize_module_unlocked_reentrant (module, reserved);
+		}
+
+	pthread_mutex_unlock (&mutex);
+
+	return rv;
+}
+
+/* -----------------------------------------------------------------------------
+ * PKCS#11 PROXY MODULE
+ */
+
+static CK_RV
+map_slot_unlocked (CK_SLOT_ID slot, Mapping *mapping)
+{
+	assert (mapping);
+
+	if (slot < MAPPING_OFFSET)
+		return CKR_SLOT_ID_INVALID;
+	slot -= MAPPING_OFFSET;
+
+	if (slot > gl.n_mappings) {
+		return CKR_SLOT_ID_INVALID;
+	} else {
+		assert (gl.mappings);
+		memcpy (mapping, &gl.mappings[slot], sizeof (Mapping));
+		return CKR_OK;
+	}
+}
+
+static CK_RV
+map_slot_to_real (CK_SLOT_ID_PTR slot, Mapping *mapping)
+{
+	CK_RV rv;
+
+	assert (mapping);
+
+	pthread_mutex_lock (&mutex);
+
+		if (!gl.mappings)
+			rv = CKR_CRYPTOKI_NOT_INITIALIZED;
+		else
+			rv = map_slot_unlocked (*slot, mapping);
+		if (rv == CKR_OK)
+			*slot = mapping->real_slot;
+
+	pthread_mutex_unlock (&mutex);
+
+	return rv;
+}
+
+static CK_RV
+map_session_to_real (CK_SESSION_HANDLE_PTR handle, Mapping *mapping, Session *session)
+{
+	CK_RV rv = CKR_OK;
+	Session *sess;
+
+	assert (handle);
+	assert (mapping);
+
+	pthread_mutex_lock (&mutex);
+
+		if (!gl.sessions) {
+			rv = CKR_CRYPTOKI_NOT_INITIALIZED;
+		} else {
+			assert (gl.sessions);
+			sess = hsh_get (gl.sessions, handle, sizeof (handle));
+			if (sess != NULL) {
+				*handle = sess->real_session;
+				rv = map_slot_unlocked (sess->wrap_slot, mapping);
+				if (session != NULL)
+					memcpy (session, sess, sizeof (Session));
+			} else {
+				rv = CKR_SESSION_HANDLE_INVALID;
+			}
+		}
+
+	pthread_mutex_unlock (&mutex);
+
+	return rv;
+}
+
+static void
+finalize_mappings_unlocked (void)
+{
+	hsh_index_t *iter;
+
+	/* No more mappings */
+	free (gl.mappings);
+	gl.mappings = NULL;
+	gl.n_mappings = 0;
+
+	/* no more sessions */
+	if (gl.sessions) {
+		for (iter = hsh_first (gl.sessions); iter; iter = hsh_next (iter))
+			free (hsh_this (iter, NULL, NULL));
+		hsh_free (gl.sessions);
+		gl.sessions = NULL;
+	}
+}
+
+static CK_RV
+proxy_C_Finalize (CK_VOID_PTR reserved)
+{
+	CK_RV rv;
+
+	/* WARNING: This function must be reentrant */
+
+	if (reserved)
+		return CKR_ARGUMENTS_BAD;
+
+	pthread_mutex_lock (&mutex);
+
+		/* WARNING: Reentrancy can occur here */
+		rv = finalize_registered_unlocked_reentrant (reserved);
+
+		/*
+		 * If modules are all gone, then this was the last
+		 * finalize, so cleanup our mappings
+		 */
+		if (gl.modules == NULL)
+			finalize_mappings_unlocked ();
+
+	pthread_mutex_unlock (&mutex);
+
+	return rv;
+}
+
+static CK_RV
+initialize_mappings_unlocked_reentrant (void)
+{
+	CK_FUNCTION_LIST_PTR funcs;
+	Mapping *mappings = NULL;
+	int n_mappings = 0;
+	CK_SLOT_ID_PTR slots;
+	CK_ULONG i, count;
+	Module *module;
+	CK_RV rv;
+
+	assert (!gl.mappings);
+
+	for (module = gl.modules; module; module = module->next) {
+
+		/* Only do registered modules */
+		if (module->ref_count && !module->name)
+			continue;
+
+		funcs = module->funcs;
+		assert (funcs);
+		slots = NULL;
+
+		pthread_mutex_unlock (&mutex);
+
+			/* Ask module for its slots */
+			rv = (funcs->C_GetSlotList) (FALSE, NULL, &count);
+			if (rv == CKR_OK && count) {
+				slots = calloc (sizeof (CK_SLOT_ID), count);
+				if (!slots)
+					rv = CKR_HOST_MEMORY;
+				else
+					rv = (funcs->C_GetSlotList) (FALSE, slots, &count);
+			}
+
+		pthread_mutex_lock (&mutex);
+
+		if (rv != CKR_OK) {
+			free (slots);
+			break;
+		}
+
+		mappings = xrealloc (mappings, sizeof (Mapping) * (n_mappings + count));
+		if (!mappings) {
+			free (slots);
+			rv = CKR_HOST_MEMORY;
+			break;
+		}
+
+		/* And now add a mapping for each of those slots */
+		for (i = 0; i < count; ++i) {
+			mappings[n_mappings].funcs = funcs;
+			mappings[n_mappings].wrap_slot = n_mappings + MAPPING_OFFSET;
+			mappings[n_mappings].real_slot = slots[i];
+			++n_mappings;
+		}
+
+		free (slots);
+	}
+
+	/* Another thread raced us here due to above reentrancy */
+	if (gl.mappings) {
+		free (mappings);
+		return CKR_OK;
+	}
+
+	assert (!gl.sessions);
+	gl.sessions = hsh_create ();
+
+	/* Any cleanup necessary for failure will happen at caller */
+	return rv;
+}
+
+static CK_RV
+proxy_C_Initialize (CK_VOID_PTR init_args)
+{
+	CK_RV rv;
+
+	/* WARNING: This function must be reentrant */
+
+	pthread_mutex_lock (&mutex);
+
+		/* WARNING: Reentrancy can occur here */
+		rv = initialize_registered_unlocked_reentrant (init_args);
+
+		/* WARNING: Reentrancy can occur here */
+		if (rv == CKR_OK && !gl.mappings)
+			rv = initialize_mappings_unlocked_reentrant ();
+
+	pthread_mutex_unlock (&mutex);
+
+	if (rv != CKR_OK)
+		proxy_C_Finalize (NULL);
+
+	return rv;
+}
+
+static CK_RV
+proxy_C_GetInfo (CK_INFO_PTR info)
+{
+	CK_RV rv = CKR_OK;
+
+	if (info == NULL)
+		return CKR_ARGUMENTS_BAD;
+
+	pthread_mutex_lock (&mutex);
+
+		if (!gl.mappings)
+			rv = CKR_CRYPTOKI_NOT_INITIALIZED;
+
+	pthread_mutex_unlock (&mutex);
+
+	if (rv != CKR_OK)
+		return rv;
+
+	info->cryptokiVersion.major = CRYPTOKI_VERSION_MAJOR;
+	info->cryptokiVersion.minor = CRYPTOKI_VERSION_MINOR;
+	info->libraryVersion.major = LIBRARY_VERSION_MAJOR;
+	info->libraryVersion.minor = LIBRARY_VERSION_MINOR;
+	info->flags = 0;
+	strncpy ((char*)info->manufacturerID, MANUFACTURER_ID, 32);
+	strncpy ((char*)info->libraryDescription, LIBRARY_DESCRIPTION, 32);
+	return CKR_OK;
+}
+
+static CK_RV
+proxy_C_GetFunctionList (CK_FUNCTION_LIST_PTR_PTR list)
+{
+	/* Can be called before C_Initialize */
+
+	if (!list)
+		return CKR_ARGUMENTS_BAD;
+	*list = &proxy_function_list;
+	return CKR_OK;
+}
+
+static CK_RV
+proxy_C_GetSlotList (CK_BBOOL token_present, CK_SLOT_ID_PTR slot_list,
+                       CK_ULONG_PTR count)
+{
+	CK_SLOT_INFO info;
+	Mapping *mapping;
+	CK_ULONG index;
+	CK_RV rv = CKR_OK;
+	int i;
+
+	if (!count)
+		return CKR_ARGUMENTS_BAD;
+
+	pthread_mutex_lock (&mutex);
+
+		if (!gl.mappings) {
+			rv = CKR_CRYPTOKI_NOT_INITIALIZED;
+		} else {
+			index = 0;
+
+			/* Go through and build up a map */
+			for (i = 0; i < gl.n_mappings; ++i) {
+				mapping = &gl.mappings[i];
+
+				/* Skip ones without a token if requested */
+				if (token_present) {
+					rv = (mapping->funcs->C_GetSlotInfo) (mapping->real_slot, &info);
+					if (rv != CKR_OK)
+						break;
+					if (!(info.flags & CKF_TOKEN_PRESENT))
+						continue;
+				}
+
+				/* Fill in the slot if we can */
+				if (slot_list && *count > index)
+					slot_list[index] = mapping->wrap_slot;
+
+				++index;
+			}
+
+			if (slot_list && *count < index)
+				rv = CKR_BUFFER_TOO_SMALL;
+
+			*count = index;
+		}
+
+	pthread_mutex_unlock (&mutex);
+
+	return rv;
+}
+
+static CK_RV
+proxy_C_GetSlotInfo (CK_SLOT_ID id, CK_SLOT_INFO_PTR info)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_slot_to_real (&id, &map);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_GetSlotInfo) (id, info);
+}
+
+static CK_RV
+proxy_C_GetTokenInfo (CK_SLOT_ID id, CK_TOKEN_INFO_PTR info)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_slot_to_real (&id, &map);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_GetTokenInfo) (id, info);
+}
+
+static CK_RV
+proxy_C_GetMechanismList (CK_SLOT_ID id, CK_MECHANISM_TYPE_PTR mechanism_list,
+                          CK_ULONG_PTR count)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_slot_to_real (&id, &map);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_GetMechanismList) (id, mechanism_list, count);
+}
+
+static CK_RV
+proxy_C_GetMechanismInfo (CK_SLOT_ID id, CK_MECHANISM_TYPE type,
+                          CK_MECHANISM_INFO_PTR info)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_slot_to_real (&id, &map);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_GetMechanismInfo) (id, type, info);
+}
+
+static CK_RV
+proxy_C_InitToken (CK_SLOT_ID id, CK_UTF8CHAR_PTR pin, CK_ULONG pin_len, CK_UTF8CHAR_PTR label)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_slot_to_real (&id, &map);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_InitToken) (id, pin, pin_len, label);
+}
+
+static CK_RV
+proxy_C_WaitForSlotEvent (CK_FLAGS flags, CK_SLOT_ID_PTR slot, CK_VOID_PTR reserved)
+{
+	return CKR_FUNCTION_NOT_SUPPORTED;
+}
+
+static CK_RV
+proxy_C_OpenSession (CK_SLOT_ID id, CK_FLAGS flags, CK_VOID_PTR user_data,
+                     CK_NOTIFY callback, CK_SESSION_HANDLE_PTR handle)
+{
+	Session *sess;
+	Mapping map;
+	CK_RV rv;
+
+	if (handle == NULL)
+		return CKR_ARGUMENTS_BAD;
+
+	rv = map_slot_to_real (&id, &map);
+	if (rv != CKR_OK)
+		return rv;
+
+	rv = (map.funcs->C_OpenSession) (id, flags, user_data, callback, handle);
+
+	if (rv == CKR_OK) {
+		pthread_mutex_lock (&mutex);
+
+			if (!gl.sessions) {
+				/*
+				 * The underlying module should have returned an error, so this
+				 * code should never be reached with properly behaving modules.
+				 * That's why we don't cleanup and close the newly opened session here
+				 * or anything like that.
+				 */
+				rv = CKR_CRYPTOKI_NOT_INITIALIZED;
+
+			} else {
+				sess = calloc (1, sizeof (Session));
+				sess->wrap_slot = map.wrap_slot;
+				sess->real_session = *handle;
+				sess->wrap_session = ++gl.last_handle; /* TODO: Handle wrapping, and then collisions */
+				hsh_set (gl.sessions, &sess->wrap_session, sizeof (sess->wrap_session), sess);
+				*handle = sess->wrap_session;
+			}
+
+		pthread_mutex_unlock (&mutex);
+	}
+
+	return rv;
+}
+
+static CK_RV
+proxy_C_CloseSession (CK_SESSION_HANDLE handle)
+{
+	CK_SESSION_HANDLE key;
+	Mapping map;
+	CK_RV rv;
+
+	key = handle;
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	rv = (map.funcs->C_CloseSession) (handle);
+
+	if (rv == CKR_OK) {
+		pthread_mutex_lock (&mutex);
+
+			if (gl.sessions)
+				hsh_rem (gl.sessions, &key, sizeof (key));
+
+		pthread_mutex_unlock (&mutex);
+	}
+
+	return rv;
+}
+
+static CK_RV
+proxy_C_CloseAllSessions (CK_SLOT_ID id)
+{
+	CK_SESSION_HANDLE_PTR to_close;
+	CK_RV rv = CKR_OK;
+	Session *sess;
+	CK_ULONG i, count;
+	hsh_index_t *iter;
+
+	pthread_mutex_lock (&mutex);
+
+		if (!gl.sessions) {
+			rv = CKR_CRYPTOKI_NOT_INITIALIZED;
+		} else {
+			to_close = calloc (sizeof (CK_SESSION_HANDLE), hsh_count (gl.sessions));
+			if (!to_close) {
+				rv = CKR_HOST_MEMORY;
+			} else {
+				for (iter = hsh_first (gl.sessions), count = 0;
+				     iter; iter = hsh_next (iter)) {
+					sess = hsh_this (iter, NULL, NULL);
+					if (sess->wrap_slot == id && to_close)
+						to_close[count++] = sess->wrap_session;
+				}
+			}
+		}
+
+	pthread_mutex_unlock (&mutex);
+
+	if (rv != CKR_OK)
+		return rv;
+
+	for (i = 0; i < count; ++i)
+		proxy_C_CloseSession (to_close[i]);
+
+	free (to_close);
+	return CKR_OK;
+}
+
+static CK_RV
+proxy_C_GetFunctionStatus (CK_SESSION_HANDLE handle)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_GetFunctionStatus) (handle);
+}
+
+static CK_RV
+proxy_C_CancelFunction (CK_SESSION_HANDLE handle)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_CancelFunction) (handle);
+}
+
+static CK_RV
+proxy_C_GetSessionInfo (CK_SESSION_HANDLE handle, CK_SESSION_INFO_PTR info)
+{
+	Mapping map;
+	CK_RV rv;
+
+	if (info == NULL)
+		return CKR_ARGUMENTS_BAD;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+
+	rv = (map.funcs->C_GetSessionInfo) (handle, info);
+	if (rv == CKR_OK)
+		info->slotID = map.wrap_slot;
+
+	return rv;
+}
+
+static CK_RV
+proxy_C_InitPIN (CK_SESSION_HANDLE handle, CK_UTF8CHAR_PTR pin, CK_ULONG pin_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+
+	return (map.funcs->C_InitPIN) (handle, pin, pin_len);
+}
+
+static CK_RV
+proxy_C_SetPIN (CK_SESSION_HANDLE handle, CK_UTF8CHAR_PTR old_pin, CK_ULONG old_pin_len,
+                CK_UTF8CHAR_PTR new_pin, CK_ULONG new_pin_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+
+	return (map.funcs->C_SetPIN) (handle, old_pin, old_pin_len, new_pin, new_pin_len);
+}
+
+static CK_RV
+proxy_C_GetOperationState (CK_SESSION_HANDLE handle, CK_BYTE_PTR operation_state, CK_ULONG_PTR operation_state_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_GetOperationState) (handle, operation_state, operation_state_len);
+}
+
+static CK_RV
+proxy_C_SetOperationState (CK_SESSION_HANDLE handle, CK_BYTE_PTR operation_state,
+                           CK_ULONG operation_state_len, CK_OBJECT_HANDLE encryption_key,
+                           CK_OBJECT_HANDLE authentication_key)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_SetOperationState) (handle, operation_state, operation_state_len, encryption_key, authentication_key);
+}
+
+static CK_RV
+proxy_C_Login (CK_SESSION_HANDLE handle, CK_USER_TYPE user_type,
+               CK_UTF8CHAR_PTR pin, CK_ULONG pin_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+
+	return (map.funcs->C_Login) (handle, user_type, pin, pin_len);
+}
+
+static CK_RV
+proxy_C_Logout (CK_SESSION_HANDLE handle)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_Logout) (handle);
+}
+
+static CK_RV
+proxy_C_CreateObject (CK_SESSION_HANDLE handle, CK_ATTRIBUTE_PTR template,
+                      CK_ULONG count, CK_OBJECT_HANDLE_PTR new_object)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+
+	return (map.funcs->C_CreateObject) (handle, template, count, new_object);
+}
+
+static CK_RV
+proxy_C_CopyObject (CK_SESSION_HANDLE handle, CK_OBJECT_HANDLE object,
+                    CK_ATTRIBUTE_PTR template, CK_ULONG count,
+                    CK_OBJECT_HANDLE_PTR new_object)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_CopyObject) (handle, object, template, count, new_object);
+}
+
+static CK_RV
+proxy_C_DestroyObject (CK_SESSION_HANDLE handle, CK_OBJECT_HANDLE object)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_DestroyObject) (handle, object);
+}
+
+static CK_RV
+proxy_C_GetObjectSize (CK_SESSION_HANDLE handle, CK_OBJECT_HANDLE object,
+                       CK_ULONG_PTR size)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_GetObjectSize) (handle, object, size);
+}
+
+static CK_RV
+proxy_C_GetAttributeValue (CK_SESSION_HANDLE handle, CK_OBJECT_HANDLE object,
+                           CK_ATTRIBUTE_PTR template, CK_ULONG count)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_GetAttributeValue) (handle, object, template, count);
+}
+
+static CK_RV
+proxy_C_SetAttributeValue (CK_SESSION_HANDLE handle, CK_OBJECT_HANDLE object,
+                           CK_ATTRIBUTE_PTR template, CK_ULONG count)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_SetAttributeValue) (handle, object, template, count);
+}
+
+static CK_RV
+proxy_C_FindObjectsInit (CK_SESSION_HANDLE handle, CK_ATTRIBUTE_PTR template,
+                         CK_ULONG count)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_FindObjectsInit) (handle, template, count);
+}
+
+static CK_RV
+proxy_C_FindObjects (CK_SESSION_HANDLE handle, CK_OBJECT_HANDLE_PTR objects,
+                     CK_ULONG max_count, CK_ULONG_PTR count)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_FindObjects) (handle, objects, max_count, count);
+}
+
+static CK_RV
+proxy_C_FindObjectsFinal (CK_SESSION_HANDLE handle)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_FindObjectsFinal) (handle);
+}
+
+static CK_RV
+proxy_C_EncryptInit (CK_SESSION_HANDLE handle, CK_MECHANISM_PTR mechanism,
+                     CK_OBJECT_HANDLE key)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_EncryptInit) (handle, mechanism, key);
+}
+
+static CK_RV
+proxy_C_Encrypt (CK_SESSION_HANDLE handle, CK_BYTE_PTR data, CK_ULONG data_len,
+                 CK_BYTE_PTR encrypted_data, CK_ULONG_PTR encrypted_data_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_Encrypt) (handle, data, data_len, encrypted_data, encrypted_data_len);
+}
+
+static CK_RV
+proxy_C_EncryptUpdate (CK_SESSION_HANDLE handle, CK_BYTE_PTR part,
+                       CK_ULONG part_len, CK_BYTE_PTR encrypted_part,
+                       CK_ULONG_PTR encrypted_part_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_EncryptUpdate) (handle, part, part_len, encrypted_part, encrypted_part_len);
+}
+
+static CK_RV
+proxy_C_EncryptFinal (CK_SESSION_HANDLE handle, CK_BYTE_PTR last_part,
+                      CK_ULONG_PTR last_part_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_EncryptFinal) (handle, last_part, last_part_len);
+}
+
+static CK_RV
+proxy_C_DecryptInit (CK_SESSION_HANDLE handle, CK_MECHANISM_PTR mechanism,
+                     CK_OBJECT_HANDLE key)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_DecryptInit) (handle, mechanism, key);
+}
+
+static CK_RV
+proxy_C_Decrypt (CK_SESSION_HANDLE handle, CK_BYTE_PTR enc_data,
+                 CK_ULONG enc_data_len, CK_BYTE_PTR data, CK_ULONG_PTR data_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_Decrypt) (handle, enc_data, enc_data_len, data, data_len);
+}
+
+static CK_RV
+proxy_C_DecryptUpdate (CK_SESSION_HANDLE handle, CK_BYTE_PTR enc_part,
+                       CK_ULONG enc_part_len, CK_BYTE_PTR part, CK_ULONG_PTR part_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_DecryptUpdate) (handle, enc_part, enc_part_len, part, part_len);
+}
+
+static CK_RV
+proxy_C_DecryptFinal (CK_SESSION_HANDLE handle, CK_BYTE_PTR last_part,
+                      CK_ULONG_PTR last_part_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_DecryptFinal) (handle, last_part, last_part_len);
+}
+
+static CK_RV
+proxy_C_DigestInit (CK_SESSION_HANDLE handle, CK_MECHANISM_PTR mechanism)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_DigestInit) (handle, mechanism);
+}
+
+static CK_RV
+proxy_C_Digest (CK_SESSION_HANDLE handle, CK_BYTE_PTR data, CK_ULONG data_len,
+                CK_BYTE_PTR digest, CK_ULONG_PTR digest_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_Digest) (handle, data, data_len, digest, digest_len);
+}
+
+static CK_RV
+proxy_C_DigestUpdate (CK_SESSION_HANDLE handle, CK_BYTE_PTR part, CK_ULONG part_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_DigestUpdate) (handle, part, part_len);
+}
+
+static CK_RV
+proxy_C_DigestKey (CK_SESSION_HANDLE handle, CK_OBJECT_HANDLE key)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_DigestKey) (handle, key);
+}
+
+static CK_RV
+proxy_C_DigestFinal (CK_SESSION_HANDLE handle, CK_BYTE_PTR digest,
+                     CK_ULONG_PTR digest_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_DigestFinal) (handle, digest, digest_len);
+}
+
+static CK_RV
+proxy_C_SignInit (CK_SESSION_HANDLE handle, CK_MECHANISM_PTR mechanism,
+                  CK_OBJECT_HANDLE key)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_SignInit) (handle, mechanism, key);
+}
+
+static CK_RV
+proxy_C_Sign (CK_SESSION_HANDLE handle, CK_BYTE_PTR data, CK_ULONG data_len,
+              CK_BYTE_PTR signature, CK_ULONG_PTR signature_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_Sign) (handle, data, data_len, signature, signature_len);
+}
+
+static CK_RV
+proxy_C_SignUpdate (CK_SESSION_HANDLE handle, CK_BYTE_PTR part, CK_ULONG part_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_SignUpdate) (handle, part, part_len);
+}
+
+static CK_RV
+proxy_C_SignFinal (CK_SESSION_HANDLE handle, CK_BYTE_PTR signature,
+                   CK_ULONG_PTR signature_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_SignFinal) (handle, signature, signature_len);
+}
+
+static CK_RV
+proxy_C_SignRecoverInit (CK_SESSION_HANDLE handle, CK_MECHANISM_PTR mechanism,
+                         CK_OBJECT_HANDLE key)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_SignRecoverInit) (handle, mechanism, key);
+}
+
+static CK_RV
+proxy_C_SignRecover (CK_SESSION_HANDLE handle, CK_BYTE_PTR data, CK_ULONG data_len,
+                     CK_BYTE_PTR signature, CK_ULONG_PTR signature_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_SignRecover) (handle, data, data_len, signature, signature_len);
+}
+
+static CK_RV
+proxy_C_VerifyInit (CK_SESSION_HANDLE handle, CK_MECHANISM_PTR mechanism,
+                    CK_OBJECT_HANDLE key)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_VerifyInit) (handle, mechanism, key);
+}
+
+static CK_RV
+proxy_C_Verify (CK_SESSION_HANDLE handle, CK_BYTE_PTR data, CK_ULONG data_len,
+                CK_BYTE_PTR signature, CK_ULONG signature_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_Verify) (handle, data, data_len, signature, signature_len);
+}
+
+static CK_RV
+proxy_C_VerifyUpdate (CK_SESSION_HANDLE handle, CK_BYTE_PTR part, CK_ULONG part_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_VerifyUpdate) (handle, part, part_len);
+}
+
+static CK_RV
+proxy_C_VerifyFinal (CK_SESSION_HANDLE handle, CK_BYTE_PTR signature,
+                     CK_ULONG signature_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_VerifyFinal) (handle, signature, signature_len);
+}
+
+static CK_RV
+proxy_C_VerifyRecoverInit (CK_SESSION_HANDLE handle, CK_MECHANISM_PTR mechanism,
+                           CK_OBJECT_HANDLE key)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_VerifyRecoverInit) (handle, mechanism, key);
+}
+
+static CK_RV
+proxy_C_VerifyRecover (CK_SESSION_HANDLE handle, CK_BYTE_PTR signature,
+                       CK_ULONG signature_len, CK_BYTE_PTR data, CK_ULONG_PTR data_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_VerifyRecover) (handle, signature, signature_len, data, data_len);
+}
+
+static CK_RV
+proxy_C_DigestEncryptUpdate (CK_SESSION_HANDLE handle, CK_BYTE_PTR part,
+                             CK_ULONG part_len, CK_BYTE_PTR enc_part,
+                             CK_ULONG_PTR enc_part_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_DigestEncryptUpdate) (handle, part, part_len, enc_part, enc_part_len);
+}
+
+static CK_RV
+proxy_C_DecryptDigestUpdate (CK_SESSION_HANDLE handle, CK_BYTE_PTR enc_part,
+                             CK_ULONG enc_part_len, CK_BYTE_PTR part,
+                             CK_ULONG_PTR part_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_DecryptDigestUpdate) (handle, enc_part, enc_part_len, part, part_len);
+}
+
+static CK_RV
+proxy_C_SignEncryptUpdate (CK_SESSION_HANDLE handle, CK_BYTE_PTR part,
+                           CK_ULONG part_len, CK_BYTE_PTR enc_part,
+                           CK_ULONG_PTR enc_part_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_SignEncryptUpdate) (handle, part, part_len, enc_part, enc_part_len);
+}
+
+static CK_RV
+proxy_C_DecryptVerifyUpdate (CK_SESSION_HANDLE handle, CK_BYTE_PTR enc_part,
+                             CK_ULONG enc_part_len, CK_BYTE_PTR part,
+                             CK_ULONG_PTR part_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_DecryptVerifyUpdate) (handle, enc_part, enc_part_len, part, part_len);
+}
+
+static CK_RV
+proxy_C_GenerateKey (CK_SESSION_HANDLE handle, CK_MECHANISM_PTR mechanism,
+                     CK_ATTRIBUTE_PTR template, CK_ULONG count,
+                     CK_OBJECT_HANDLE_PTR key)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_GenerateKey) (handle, mechanism, template, count, key);
+}
+
+static CK_RV
+proxy_C_GenerateKeyPair (CK_SESSION_HANDLE handle, CK_MECHANISM_PTR mechanism,
+                         CK_ATTRIBUTE_PTR pub_template, CK_ULONG pub_count,
+                         CK_ATTRIBUTE_PTR priv_template, CK_ULONG priv_count,
+                         CK_OBJECT_HANDLE_PTR pub_key, CK_OBJECT_HANDLE_PTR priv_key)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_GenerateKeyPair) (handle, mechanism, pub_template, pub_count, priv_template, priv_count, pub_key, priv_key);
+}
+
+static CK_RV
+proxy_C_WrapKey (CK_SESSION_HANDLE handle, CK_MECHANISM_PTR mechanism,
+                 CK_OBJECT_HANDLE wrapping_key, CK_OBJECT_HANDLE key,
+                 CK_BYTE_PTR wrapped_key, CK_ULONG_PTR wrapped_key_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_WrapKey) (handle, mechanism, wrapping_key, key, wrapped_key, wrapped_key_len);
+}
+
+static CK_RV
+proxy_C_UnwrapKey (CK_SESSION_HANDLE handle, CK_MECHANISM_PTR mechanism,
+                   CK_OBJECT_HANDLE unwrapping_key, CK_BYTE_PTR wrapped_key,
+                   CK_ULONG wrapped_key_len, CK_ATTRIBUTE_PTR template,
+                   CK_ULONG count, CK_OBJECT_HANDLE_PTR key)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_UnwrapKey) (handle, mechanism, unwrapping_key, wrapped_key, wrapped_key_len, template, count, key);
+}
+
+static CK_RV
+proxy_C_DeriveKey (CK_SESSION_HANDLE handle, CK_MECHANISM_PTR mechanism,
+                   CK_OBJECT_HANDLE base_key, CK_ATTRIBUTE_PTR template,
+                   CK_ULONG count, CK_OBJECT_HANDLE_PTR key)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_DeriveKey) (handle, mechanism, base_key, template, count, key);
+}
+
+static CK_RV
+proxy_C_SeedRandom (CK_SESSION_HANDLE handle, CK_BYTE_PTR seed, CK_ULONG seed_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_SeedRandom) (handle, seed, seed_len);
+}
+
+static CK_RV
+proxy_C_GenerateRandom (CK_SESSION_HANDLE handle, CK_BYTE_PTR random_data,
+                          CK_ULONG random_len)
+{
+	Mapping map;
+	CK_RV rv;
+
+	rv = map_session_to_real (&handle, &map, NULL);
+	if (rv != CKR_OK)
+		return rv;
+	return (map.funcs->C_GenerateRandom) (handle, random_data, random_len);
+}
+
+/* --------------------------------------------------------------------
+ * MODULE ENTRY POINT
+ */
+
+static CK_FUNCTION_LIST proxy_function_list = {
+	{ CRYPTOKI_VERSION_MAJOR, CRYPTOKI_VERSION_MINOR },  /* version */
+	proxy_C_Initialize,
+	proxy_C_Finalize,
+	proxy_C_GetInfo,
+	proxy_C_GetFunctionList,
+	proxy_C_GetSlotList,
+	proxy_C_GetSlotInfo,
+	proxy_C_GetTokenInfo,
+	proxy_C_GetMechanismList,
+	proxy_C_GetMechanismInfo,
+	proxy_C_InitToken,
+	proxy_C_InitPIN,
+	proxy_C_SetPIN,
+	proxy_C_OpenSession,
+	proxy_C_CloseSession,
+	proxy_C_CloseAllSessions,
+	proxy_C_GetSessionInfo,
+	proxy_C_GetOperationState,
+	proxy_C_SetOperationState,
+	proxy_C_Login,
+	proxy_C_Logout,
+	proxy_C_CreateObject,
+	proxy_C_CopyObject,
+	proxy_C_DestroyObject,
+	proxy_C_GetObjectSize,
+	proxy_C_GetAttributeValue,
+	proxy_C_SetAttributeValue,
+	proxy_C_FindObjectsInit,
+	proxy_C_FindObjects,
+	proxy_C_FindObjectsFinal,
+	proxy_C_EncryptInit,
+	proxy_C_Encrypt,
+	proxy_C_EncryptUpdate,
+	proxy_C_EncryptFinal,
+	proxy_C_DecryptInit,
+	proxy_C_Decrypt,
+	proxy_C_DecryptUpdate,
+	proxy_C_DecryptFinal,
+	proxy_C_DigestInit,
+	proxy_C_Digest,
+	proxy_C_DigestUpdate,
+	proxy_C_DigestKey,
+	proxy_C_DigestFinal,
+	proxy_C_SignInit,
+	proxy_C_Sign,
+	proxy_C_SignUpdate,
+	proxy_C_SignFinal,
+	proxy_C_SignRecoverInit,
+	proxy_C_SignRecover,
+	proxy_C_VerifyInit,
+	proxy_C_Verify,
+	proxy_C_VerifyUpdate,
+	proxy_C_VerifyFinal,
+	proxy_C_VerifyRecoverInit,
+	proxy_C_VerifyRecover,
+	proxy_C_DigestEncryptUpdate,
+	proxy_C_DecryptDigestUpdate,
+	proxy_C_SignEncryptUpdate,
+	proxy_C_DecryptVerifyUpdate,
+	proxy_C_GenerateKey,
+	proxy_C_GenerateKeyPair,
+	proxy_C_WrapKey,
+	proxy_C_UnwrapKey,
+	proxy_C_DeriveKey,
+	proxy_C_SeedRandom,
+	proxy_C_GenerateRandom,
+	proxy_C_GetFunctionStatus,
+	proxy_C_CancelFunction,
+	proxy_C_WaitForSlotEvent
+};
+
+CK_RV
+C_GetFunctionList (CK_FUNCTION_LIST_PTR_PTR list)
+{
+	return proxy_C_GetFunctionList (list);
+}