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/*
* Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* Copyright 2004-2014, Akamai Technologies. All Rights Reserved.
* This file is distributed under the terms of the OpenSSL license.
*/
/*
* This file is in two halves. The first half implements the public API
* to be used by external consumers, and to be used by OpenSSL to store
* data in a "secure arena." The second half implements the secure arena.
* For details on that implementation, see below (look for uppercase
* "SECURE HEAP IMPLEMENTATION").
*/
#include <openssl/crypto.h>
#include <e_os.h>
#include <string.h>
#if defined(OPENSSL_SYS_LINUX) || defined(OPENSSL_SYS_UNIX)
# define IMPLEMENTED
# include <stdlib.h>
# include <assert.h>
# include <unistd.h>
# include <sys/types.h>
# include <sys/mman.h>
# include <sys/param.h>
# include <sys/stat.h>
# include <fcntl.h>
#endif
#define CLEAR(p, s) OPENSSL_cleanse(p, s)
#ifndef PAGE_SIZE
# define PAGE_SIZE 4096
#endif
#ifdef IMPLEMENTED
static size_t secure_mem_used;
static int secure_mem_initialized;
static CRYPTO_RWLOCK *sec_malloc_lock = NULL;
/*
* These are the functions that must be implemented by a secure heap (sh).
*/
static int sh_init(size_t size, int minsize);
static char *sh_malloc(size_t size);
static void sh_free(char *ptr);
static void sh_done(void);
static size_t sh_actual_size(char *ptr);
static int sh_allocated(const char *ptr);
#endif
int CRYPTO_secure_malloc_init(size_t size, int minsize)
{
#ifdef IMPLEMENTED
int ret = 0;
if (!secure_mem_initialized) {
sec_malloc_lock = CRYPTO_THREAD_lock_new();
if (sec_malloc_lock == NULL)
return 0;
ret = sh_init(size, minsize);
secure_mem_initialized = 1;
}
return ret;
#else
return 0;
#endif /* IMPLEMENTED */
}
int CRYPTO_secure_malloc_done()
{
#ifdef IMPLEMENTED
if (secure_mem_used == 0) {
sh_done();
secure_mem_initialized = 0;
CRYPTO_THREAD_lock_free(sec_malloc_lock);
return 1;
}
#endif /* IMPLEMENTED */
return 0;
}
int CRYPTO_secure_malloc_initialized()
{
#ifdef IMPLEMENTED
return secure_mem_initialized;
#else
return 0;
#endif /* IMPLEMENTED */
}
void *CRYPTO_secure_malloc(size_t num, const char *file, int line)
{
#ifdef IMPLEMENTED
void *ret;
size_t actual_size;
if (!secure_mem_initialized) {
return CRYPTO_malloc(num, file, line);
}
CRYPTO_THREAD_write_lock(sec_malloc_lock);
ret = sh_malloc(num);
actual_size = ret ? sh_actual_size(ret) : 0;
secure_mem_used += actual_size;
CRYPTO_THREAD_unlock(sec_malloc_lock);
return ret;
#else
return CRYPTO_malloc(num, file, line);
#endif /* IMPLEMENTED */
}
void *CRYPTO_secure_zalloc(size_t num, const char *file, int line)
{
void *ret = CRYPTO_secure_malloc(num, file, line);
if (ret != NULL)
memset(ret, 0, num);
return ret;
}
void CRYPTO_secure_free(void *ptr, const char *file, int line)
{
#ifdef IMPLEMENTED
size_t actual_size;
if (ptr == NULL)
return;
if (!CRYPTO_secure_allocated(ptr)) {
CRYPTO_free(ptr, file, line);
return;
}
CRYPTO_THREAD_write_lock(sec_malloc_lock);
actual_size = sh_actual_size(ptr);
CLEAR(ptr, actual_size);
secure_mem_used -= actual_size;
sh_free(ptr);
CRYPTO_THREAD_unlock(sec_malloc_lock);
#else
CRYPTO_free(ptr, file, line);
#endif /* IMPLEMENTED */
}
int CRYPTO_secure_allocated(const void *ptr)
{
#ifdef IMPLEMENTED
int ret;
if (!secure_mem_initialized)
return 0;
CRYPTO_THREAD_write_lock(sec_malloc_lock);
ret = sh_allocated(ptr);
CRYPTO_THREAD_unlock(sec_malloc_lock);
return ret;
#else
return 0;
#endif /* IMPLEMENTED */
}
size_t CRYPTO_secure_used()
{
#ifdef IMPLEMENTED
return secure_mem_used;
#else
return 0;
#endif /* IMPLEMENTED */
}
size_t CRYPTO_secure_actual_size(void *ptr)
{
#ifdef IMPLEMENTED
size_t actual_size;
CRYPTO_THREAD_write_lock(sec_malloc_lock);
actual_size = sh_actual_size(ptr);
CRYPTO_THREAD_unlock(sec_malloc_lock);
return actual_size;
#else
return 0;
#endif
}
/* END OF PAGE ...
... START OF PAGE */
/*
* SECURE HEAP IMPLEMENTATION
*/
#ifdef IMPLEMENTED
/*
* The implementation provided here uses a fixed-sized mmap() heap,
* which is locked into memory, not written to core files, and protected
* on either side by an unmapped page, which will catch pointer overruns
* (or underruns) and an attempt to read data out of the secure heap.
* Free'd memory is zero'd or otherwise cleansed.
*
* This is a pretty standard buddy allocator. We keep areas in a multiple
* of "sh.minsize" units. The freelist and bitmaps are kept separately,
* so all (and only) data is kept in the mmap'd heap.
*
* This code assumes eight-bit bytes. The numbers 3 and 7 are all over the
* place.
*/
#define ONE ((size_t)1)
# define TESTBIT(t, b) (t[(b) >> 3] & (ONE << ((b) & 7)))
# define SETBIT(t, b) (t[(b) >> 3] |= (ONE << ((b) & 7)))
# define CLEARBIT(t, b) (t[(b) >> 3] &= (0xFF & ~(ONE << ((b) & 7))))
#define WITHIN_ARENA(p) \
((char*)(p) >= sh.arena && (char*)(p) < &sh.arena[sh.arena_size])
#define WITHIN_FREELIST(p) \
((char*)(p) >= (char*)sh.freelist && (char*)(p) < (char*)&sh.freelist[sh.freelist_size])
typedef struct sh_list_st
{
struct sh_list_st *next;
struct sh_list_st **p_next;
} SH_LIST;
typedef struct sh_st
{
char* map_result;
size_t map_size;
char *arena;
size_t arena_size;
char **freelist;
ossl_ssize_t freelist_size;
size_t minsize;
unsigned char *bittable;
unsigned char *bitmalloc;
size_t bittable_size; /* size in bits */
} SH;
static SH sh;
static size_t sh_getlist(char *ptr)
{
ossl_ssize_t list = sh.freelist_size - 1;
size_t bit = (sh.arena_size + ptr - sh.arena) / sh.minsize;
for (; bit; bit >>= 1, list--) {
if (TESTBIT(sh.bittable, bit))
break;
OPENSSL_assert((bit & 1) == 0);
}
return list;
}
static int sh_testbit(char *ptr, int list, unsigned char *table)
{
size_t bit;
OPENSSL_assert(list >= 0 && list < sh.freelist_size);
OPENSSL_assert(((ptr - sh.arena) & ((sh.arena_size >> list) - 1)) == 0);
bit = (ONE << list) + ((ptr - sh.arena) / (sh.arena_size >> list));
OPENSSL_assert(bit > 0 && bit < sh.bittable_size);
return TESTBIT(table, bit);
}
static void sh_clearbit(char *ptr, int list, unsigned char *table)
{
size_t bit;
OPENSSL_assert(list >= 0 && list < sh.freelist_size);
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