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120 lines
4.0 KiB
C
120 lines
4.0 KiB
C
/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
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/* egg-secure-memory.h - library for allocating memory that is non-pageable
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Copyright (C) 2007 Stefan Walter
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The Gnome Keyring Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The Gnome Keyring Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the Gnome Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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Author: Stef Walter <stef@memberwebs.com>
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*/
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#ifndef EGG_SECURE_MEMORY_H
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#define EGG_SECURE_MEMORY_H
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#include <stdlib.h>
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/* -------------------------------------------------------------------
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* Low Level Secure Memory
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*
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* IMPORTANT: This is pure vanila standard C, no glib. We need this
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* because certain consumers of this protocol need to be built
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* without linking in any special libraries. ie: the PKCS#11 module.
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*
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* Thread locking
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*
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* In order to use these functions in a module the following functions
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* must be defined somewhere, and provide appropriate locking for
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* secure memory between threads:
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*/
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extern void egg_memory_lock (void);
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extern void egg_memory_unlock (void);
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/*
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* Allocation Fallbacks
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*
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* If we cannot allocate secure memory, then this function
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* (defined elsewhere) will be called which has a chance to
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* allocate other memory abort or do whatever.
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*
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* Same call semantics as realloc with regard to NULL and zeros
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*/
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extern void* egg_memory_fallback (void *p, size_t length);
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#define EGG_SECURE_GLIB_DEFINITIONS() \
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static GStaticMutex memory_mutex = G_STATIC_MUTEX_INIT; \
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void egg_memory_lock (void) \
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{ g_static_mutex_lock (&memory_mutex); } \
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void egg_memory_unlock (void) \
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{ g_static_mutex_unlock (&memory_mutex); } \
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void* egg_memory_fallback (void *p, size_t sz) \
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{ return g_realloc (p, sz); } \
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/*
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* Main functionality
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*
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* Allocations return NULL on failure.
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*/
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#define EGG_SECURE_USE_FALLBACK 0x0001
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#define EGG_SECURE_DECLARE(tag) \
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static inline void* egg_secure_alloc (size_t length) { \
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return egg_secure_alloc_full (G_STRINGIFY (tag), length, EGG_SECURE_USE_FALLBACK); \
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} \
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static inline void* egg_secure_realloc (void *p, size_t length) { \
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return egg_secure_realloc_full (G_STRINGIFY (tag), p, length, EGG_SECURE_USE_FALLBACK); \
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} \
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static inline void* egg_secure_strdup (const char *str) { \
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return egg_secure_strdup_full (G_STRINGIFY (tag), str, EGG_SECURE_USE_FALLBACK); \
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} \
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static inline void* egg_secure_strndup (const char *str, size_t length) { \
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return egg_secure_strndup_full (G_STRINGIFY (tag), str, length, EGG_SECURE_USE_FALLBACK); \
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}
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void* egg_secure_alloc_full (const char *tag, size_t length, int options);
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void* egg_secure_realloc_full (const char *tag, void *p, size_t length, int options);
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void egg_secure_free (void* p);
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void egg_secure_free_full (void* p, int fallback);
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void egg_secure_clear (void *p, size_t length);
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int egg_secure_check (const void* p);
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void egg_secure_validate (void);
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char* egg_secure_strdup_full (const char *tag, const char *str, int options);
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char* egg_secure_strndup_full (const char *tag, const char *str, size_t length, int options);
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void egg_secure_strclear (char *str);
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void egg_secure_strfree (char *str);
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typedef struct {
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const char *tag;
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size_t request_length;
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size_t block_length;
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} egg_secure_rec;
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egg_secure_rec * egg_secure_records (unsigned int *count);
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#endif /* EGG_SECURE_MEMORY_H */
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