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-rw-r--r--crypto/buffer/buffer.c138
1 files changed, 58 insertions, 80 deletions
diff --git a/crypto/buffer/buffer.c b/crypto/buffer/buffer.c
index eff3e081576c..72258abb9e5e 100644
--- a/crypto/buffer/buffer.c
+++ b/crypto/buffer/buffer.c
@@ -1,63 +1,14 @@
-/* crypto/buffer/buffer.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. 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.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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.
+/*
+ * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
*
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
+ * 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
*/
#include <stdio.h>
-#include "cryptlib.h"
+#include "internal/cryptlib.h"
#include <openssl/buffer.h>
/*
@@ -67,46 +18,72 @@
*/
#define LIMIT_BEFORE_EXPANSION 0x5ffffffc
+BUF_MEM *BUF_MEM_new_ex(unsigned long flags)
+{
+ BUF_MEM *ret;
+
+ ret = BUF_MEM_new();
+ if (ret != NULL)
+ ret->flags = flags;
+ return ret;
+}
+
BUF_MEM *BUF_MEM_new(void)
{
BUF_MEM *ret;
- ret = OPENSSL_malloc(sizeof(BUF_MEM));
+ ret = OPENSSL_zalloc(sizeof(*ret));
if (ret == NULL) {
BUFerr(BUF_F_BUF_MEM_NEW, ERR_R_MALLOC_FAILURE);
- return (NULL);
+ return NULL;
}
- ret->length = 0;
- ret->max = 0;
- ret->data = NULL;
- return (ret);
+ return ret;
}
void BUF_MEM_free(BUF_MEM *a)
{
if (a == NULL)
return;
-
if (a->data != NULL) {
- OPENSSL_cleanse(a->data, a->max);
- OPENSSL_free(a->data);
+ if (a->flags & BUF_MEM_FLAG_SECURE)
+ OPENSSL_secure_clear_free(a->data, a->max);
+ else
+ OPENSSL_clear_free(a->data, a->max);
}
OPENSSL_free(a);
}
-int BUF_MEM_grow(BUF_MEM *str, size_t len)
+/* Allocate a block of secure memory; copy over old data if there
+ * was any, and then free it. */
+static char *sec_alloc_realloc(BUF_MEM *str, size_t len)
+{
+ char *ret;
+
+ ret = OPENSSL_secure_malloc(len);
+ if (str->data != NULL) {
+ if (ret != NULL) {
+ memcpy(ret, str->data, str->length);
+ OPENSSL_secure_clear_free(str->data, str->length);
+ str->data = NULL;
+ }
+ }
+ return ret;
+}
+
+size_t BUF_MEM_grow(BUF_MEM *str, size_t len)
{
char *ret;
size_t n;
if (str->length >= len) {
str->length = len;
- return (len);
+ return len;
}
if (str->max >= len) {
- memset(&str->data[str->length], 0, len - str->length);
+ if (str->data != NULL)
+ memset(&str->data[str->length], 0, len - str->length);
str->length = len;
- return (len);
+ return len;
}
/* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */
if (len > LIMIT_BEFORE_EXPANSION) {
@@ -114,8 +91,8 @@ int BUF_MEM_grow(BUF_MEM *str, size_t len)
return 0;
}
n = (len + 3) / 3 * 4;
- if (str->data == NULL)
- ret = OPENSSL_malloc(n);
+ if ((str->flags & BUF_MEM_FLAG_SECURE))
+ ret = sec_alloc_realloc(str, n);
else
ret = OPENSSL_realloc(str->data, n);
if (ret == NULL) {
@@ -127,23 +104,24 @@ int BUF_MEM_grow(BUF_MEM *str, size_t len)
memset(&str->data[str->length], 0, len - str->length);
str->length = len;
}
- return (len);
+ return len;
}
-int BUF_MEM_grow_clean(BUF_MEM *str, size_t len)
+size_t BUF_MEM_grow_clean(BUF_MEM *str, size_t len)
{
char *ret;
size_t n;
if (str->length >= len) {
- memset(&str->data[len], 0, str->length - len);
+ if (str->data != NULL)
+ memset(&str->data[len], 0, str->length - len);
str->length = len;
- return (len);
+ return len;
}
if (str->max >= len) {
memset(&str->data[str->length], 0, len - str->length);
str->length = len;
- return (len);
+ return len;
}
/* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */
if (len > LIMIT_BEFORE_EXPANSION) {
@@ -151,10 +129,10 @@ int BUF_MEM_grow_clean(BUF_MEM *str, size_t len)
return 0;
}
n = (len + 3) / 3 * 4;
- if (str->data == NULL)
- ret = OPENSSL_malloc(n);
+ if ((str->flags & BUF_MEM_FLAG_SECURE))
+ ret = sec_alloc_realloc(str, n);
else
- ret = OPENSSL_realloc_clean(str->data, str->max, n);
+ ret = OPENSSL_clear_realloc(str->data, str->max, n);
if (ret == NULL) {
BUFerr(BUF_F_BUF_MEM_GROW_CLEAN, ERR_R_MALLOC_FAILURE);
len = 0;
@@ -164,7 +142,7 @@ int BUF_MEM_grow_clean(BUF_MEM *str, size_t len)
memset(&str->data[str->length], 0, len - str->length);
str->length = len;
}
- return (len);
+ return len;
}
void BUF_reverse(unsigned char *out, const unsigned char *in, size_t size)
generated by cgit v1.2.3 (git 2.25.1) at 2025-02-23 11:43:42 +0000