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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* egg-secure-memory.h - library for allocating memory that is non-pageable
*
* Copyright (C) 2007 Stefan Walter
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*
* Author: Stef Walter <stef@thewalter.net>
*/
#ifndef EGG_SECURE_MEMORY_H
#define EGG_SECURE_MEMORY_H
#include <stdlib.h>
/* -------------------------------------------------------------------
* Low Level Secure Memory
*
* IMPORTANT: This is pure vanila standard C, no glib. We need this
* because certain consumers of this protocol need to be built
* without linking in any special libraries. ie: the PKCS#11 module.
*
* Thread locking
*
* In order to use these functions in a module the following functions
* must be defined somewhere, and provide appropriate locking for
* secure memory between threads:
*/
extern void egg_memory_lock (void);
extern void egg_memory_unlock (void);
/*
* Allocation Fallbacks
*
* If we cannot allocate secure memory, then this function
* (defined elsewhere) will be called which has a chance to
* allocate other memory abort or do whatever.
*
* Same call semantics as realloc with regard to NULL and zeros
*/
extern void* egg_memory_fallback (void *p, size_t length);
#define EGG_SECURE_GLIB_DEFINITIONS() \
static GStaticMutex memory_mutex = G_STATIC_MUTEX_INIT; \
void egg_memory_lock (void) \
{ g_static_mutex_lock (&memory_mutex); } \
void egg_memory_unlock (void) \
{ g_static_mutex_unlock (&memory_mutex); } \
void* egg_memory_fallback (void *p, size_t sz) \
{ return g_realloc (p, sz); } \
/*
* Main functionality
*
* Allocations return NULL on failure.
*/
#define EGG_SECURE_USE_FALLBACK 0x0001
#define EGG_SECURE_DECLARE(tag) \
static inline void* egg_secure_alloc (size_t length) { \
return egg_secure_alloc_full (G_STRINGIFY (tag), length, EGG_SECURE_USE_FALLBACK); \
} \
static inline void* egg_secure_realloc (void *p, size_t length) { \
return egg_secure_realloc_full (G_STRINGIFY (tag), p, length, EGG_SECURE_USE_FALLBACK); \
} \
static inline void* egg_secure_strdup (const char *str) { \
return egg_secure_strdup_full (G_STRINGIFY (tag), str, EGG_SECURE_USE_FALLBACK); \
} \
static inline void* egg_secure_strndup (const char *str, size_t length) { \
return egg_secure_strndup_full (G_STRINGIFY (tag), str, length, EGG_SECURE_USE_FALLBACK); \
}
void* egg_secure_alloc_full (const char *tag, size_t length, int options);
void* egg_secure_realloc_full (const char *tag, void *p, size_t length, int options);
void egg_secure_free (void* p);
void egg_secure_free_full (void* p, int fallback);
void egg_secure_clear (void *p, size_t length);
int egg_secure_check (const void* p);
void egg_secure_validate (void);
char* egg_secure_strdup_full (const char *tag, const char *str, int options);
char* egg_secure_strndup_full (const char *tag, const char *str, size_t length, int options);
void egg_secure_strclear (char *str);
void egg_secure_strfree (char *str);
typedef struct {
const char *tag;
size_t request_length;
size_t block_length;
} egg_secure_rec;
egg_secure_rec * egg_secure_records (unsigned int *count);
#endif /* EGG_SECURE_MEMORY_H */
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