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/*
* Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.
* Copyright 2004-2014, Akamai Technologies. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (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
*/
/*
* 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 "e_os.h"
#include <openssl/crypto.h>
#include <string.h>
#ifndef OPENSSL_NO_SECURE_MEMORY
# if defined(_WIN32)
# include <windows.h>
# endif
# include <stdlib.h>
# include <assert.h>
# if defined(OPENSSL_SYS_UNIX)
# include <unistd.h>
# endif
# include <sys/types.h>
# if defined(OPENSSL_SYS_UNIX)
# include <sys/mman.h>
# endif
# if defined(OPENSSL_SYS_LINUX)
# include <sys/syscall.h>
# if defined(SYS_mlock2)
# include <linux/mman.h>
# include <errno.h>
# endif
# include <sys/param.h>
# endif
# include <sys/stat.h>
# include <fcntl.h>
#endif
#define CLEAR(p, s) OPENSSL_cleanse(p, s)
#ifndef PAGE_SIZE
# define PAGE_SIZE 4096
#endif
#if !defined(MAP_ANON) && defined(MAP_ANONYMOUS)
# define MAP_ANON MAP_ANONYMOUS
#endif
#ifndef OPENSSL_NO_SECURE_MEMORY
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, size_t minsize);
static void *sh_malloc(size_t size);
static void sh_free(void *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, size_t minsize)
{
#ifndef OPENSSL_NO_SECURE_MEMORY
int ret = 0;
if (!secure_mem_initialized) {
sec_malloc_lock = CRYPTO_THREAD_lock_new();
if (sec_malloc_lock == NULL)
return 0;
if ((ret = sh_init(size, minsize)) != 0) {
secure_mem_initialized = 1;
} else {
CRYPTO_THREAD_lock_free(sec_malloc_lock);
sec_malloc_lock = NULL;
}
}
return ret;
#else
return 0;
#endif /* OPENSSL_NO_SECURE_MEMORY */
}
int CRYPTO_secure_malloc_done(void)
{
#ifndef OPENSSL_NO_SECURE_MEMORY
if (secure_mem_used == 0) {
sh_done();
secure_mem_initialized = 0;
CRYPTO_THREAD_lock_free(sec_malloc_lock);
sec_malloc_lock = NULL;
return 1;
}
#endif /* OPENSSL_NO_SECURE_MEMORY */
return 0;
}
int CRYPTO_secure_malloc_initialized(void)
{
#ifndef OPENSSL_NO_SECURE_MEMORY
return secure_mem_initialized;
#else
return 0;
#endif /* OPENSSL_NO_SECURE_MEMORY */
}
void *CRYPTO_secure_malloc(size_t num, const char *file, int line)
{
#ifndef OPENSSL_NO_SECURE_MEMORY
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 /* OPENSSL_NO_SECURE_MEMORY */
}
void *CRYPTO_secure_zalloc(size_t num, const char *file, int line)
{
#ifndef OPENSSL_NO_SECURE_MEMORY
if (secure_mem_initialized)
/* CRYPTO_secure_malloc() zeroes allocations when it is implemented */
return CRYPTO_secure_malloc(num, file, line);
#endif
return CRYPTO_zalloc(num, file, line);
}
void CRYPTO_secure_free(void *ptr, const char *file, int line)
{
#ifndef OPENSSL_NO_SECURE_MEMORY
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 /* OPENSSL_NO_SECURE_MEMORY */
}
void CRYPTO_secure_clear_free(void *ptr, size_t num,
const char *file, int line)
{
#ifndef OPENSSL_NO_SECURE_MEMORY
size_t actual_size;
if (ptr == NULL)
return;
if (!CRYPTO_secure_allocated(ptr)) {
OPENSSL_cleanse(ptr, num);
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
if (ptr == NULL)
return;
OPENSSL_cleanse(ptr, num);
CRYPTO_free(ptr, file, line);
#endif /* OPENSSL_NO_SECURE_MEMORY */
}
int CRYPTO_secure_allocated(const void *ptr)
{
#ifndef OPENSSL_NO_SECURE_MEMORY
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 /* OPENSSL_NO_SECURE_MEMORY */
}
size_t CRYPTO_secure_used(void)
{
#ifndef OPENSSL_NO_SECURE_MEMORY
return secure_mem_used;
#else
return 0;
#endif /* OPENSSL_NO_SECURE_MEMORY */
}
size_t CRYPTO_secure_actual_size(void *ptr)
{
#ifndef OPENSSL_NO_SECURE_MEMORY
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
}
/*
* SECURE HEAP IMPLEMENTATION
*/
#ifndef OPENSSL_NO_SECURE_MEMORY
/*
* 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;
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