[331] | 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include <openssl/buffer.h>
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| 13 |
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| 14 | /*
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| 15 | * LIMIT_BEFORE_EXPANSION is the maximum n such that (n+3)/3*4 < 2**31. That
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| 16 | * function is applied in several functions in this file and this limit
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| 17 | * ensures that the result fits in an int.
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| 18 | */
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| 19 | #define LIMIT_BEFORE_EXPANSION 0x5ffffffc
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| 20 |
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| 21 | BUF_MEM *BUF_MEM_new_ex(unsigned long flags)
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| 22 | {
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| 23 | BUF_MEM *ret;
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| 24 |
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| 25 | ret = BUF_MEM_new();
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| 26 | if (ret != NULL)
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| 27 | ret->flags = flags;
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| 28 | return (ret);
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| 29 | }
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| 30 |
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| 31 | BUF_MEM *BUF_MEM_new(void)
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| 32 | {
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| 33 | BUF_MEM *ret;
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| 34 |
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| 35 | ret = OPENSSL_zalloc(sizeof(*ret));
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| 36 | if (ret == NULL) {
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| 37 | BUFerr(BUF_F_BUF_MEM_NEW, ERR_R_MALLOC_FAILURE);
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| 38 | return (NULL);
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| 39 | }
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| 40 | return (ret);
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| 41 | }
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| 42 |
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| 43 | void BUF_MEM_free(BUF_MEM *a)
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| 44 | {
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| 45 | if (a == NULL)
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| 46 | return;
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| 47 |
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| 48 | if (a->data != NULL) {
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| 49 | if (a->flags & BUF_MEM_FLAG_SECURE)
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| 50 | OPENSSL_secure_free(a->data);
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| 51 | else
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| 52 | OPENSSL_clear_free(a->data, a->max);
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| 53 | }
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| 54 | OPENSSL_free(a);
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| 55 | }
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| 56 |
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| 57 | /* Allocate a block of secure memory; copy over old data if there
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| 58 | * was any, and then free it. */
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| 59 | static char *sec_alloc_realloc(BUF_MEM *str, size_t len)
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| 60 | {
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| 61 | char *ret;
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| 62 |
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| 63 | ret = OPENSSL_secure_malloc(len);
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| 64 | if (str->data != NULL) {
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| 65 | if (ret != NULL)
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| 66 | memcpy(ret, str->data, str->length);
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| 67 | OPENSSL_secure_free(str->data);
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| 68 | }
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| 69 | return (ret);
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| 70 | }
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| 71 |
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| 72 | size_t BUF_MEM_grow(BUF_MEM *str, size_t len)
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| 73 | {
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| 74 | char *ret;
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| 75 | size_t n;
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| 76 |
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| 77 | if (str->length >= len) {
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| 78 | str->length = len;
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| 79 | return (len);
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| 80 | }
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| 81 | if (str->max >= len) {
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| 82 | if (str->data != NULL)
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| 83 | memset(&str->data[str->length], 0, len - str->length);
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| 84 | str->length = len;
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| 85 | return (len);
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| 86 | }
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| 87 | /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */
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| 88 | if (len > LIMIT_BEFORE_EXPANSION) {
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| 89 | BUFerr(BUF_F_BUF_MEM_GROW, ERR_R_MALLOC_FAILURE);
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| 90 | return 0;
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| 91 | }
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| 92 | n = (len + 3) / 3 * 4;
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| 93 | if ((str->flags & BUF_MEM_FLAG_SECURE))
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| 94 | ret = sec_alloc_realloc(str, n);
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| 95 | else
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| 96 | ret = OPENSSL_realloc(str->data, n);
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| 97 | if (ret == NULL) {
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| 98 | BUFerr(BUF_F_BUF_MEM_GROW, ERR_R_MALLOC_FAILURE);
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| 99 | len = 0;
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| 100 | } else {
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| 101 | str->data = ret;
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| 102 | str->max = n;
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| 103 | memset(&str->data[str->length], 0, len - str->length);
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| 104 | str->length = len;
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| 105 | }
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| 106 | return (len);
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| 107 | }
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| 108 |
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| 109 | size_t BUF_MEM_grow_clean(BUF_MEM *str, size_t len)
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| 110 | {
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| 111 | char *ret;
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| 112 | size_t n;
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| 113 |
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| 114 | if (str->length >= len) {
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| 115 | if (str->data != NULL)
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| 116 | memset(&str->data[len], 0, str->length - len);
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| 117 | str->length = len;
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| 118 | return (len);
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| 119 | }
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| 120 | if (str->max >= len) {
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| 121 | memset(&str->data[str->length], 0, len - str->length);
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| 122 | str->length = len;
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| 123 | return (len);
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| 124 | }
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| 125 | /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */
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| 126 | if (len > LIMIT_BEFORE_EXPANSION) {
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| 127 | BUFerr(BUF_F_BUF_MEM_GROW_CLEAN, ERR_R_MALLOC_FAILURE);
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| 128 | return 0;
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| 129 | }
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| 130 | n = (len + 3) / 3 * 4;
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| 131 | if ((str->flags & BUF_MEM_FLAG_SECURE))
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| 132 | ret = sec_alloc_realloc(str, n);
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| 133 | else
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| 134 | ret = OPENSSL_clear_realloc(str->data, str->max, n);
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| 135 | if (ret == NULL) {
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| 136 | BUFerr(BUF_F_BUF_MEM_GROW_CLEAN, ERR_R_MALLOC_FAILURE);
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| 137 | len = 0;
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| 138 | } else {
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| 139 | str->data = ret;
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| 140 | str->max = n;
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| 141 | memset(&str->data[str->length], 0, len - str->length);
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| 142 | str->length = len;
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| 143 | }
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| 144 | return (len);
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| 145 | }
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| 146 |
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| 147 | void BUF_reverse(unsigned char *out, const unsigned char *in, size_t size)
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| 148 | {
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| 149 | size_t i;
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| 150 | if (in) {
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| 151 | out += size - 1;
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| 152 | for (i = 0; i < size; i++)
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| 153 | *out-- = *in++;
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| 154 | } else {
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| 155 | unsigned char *q;
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| 156 | char c;
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| 157 | q = out + size - 1;
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| 158 | for (i = 0; i < size / 2; i++) {
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| 159 | c = *q;
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| 160 | *q-- = *out;
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| 161 | *out++ = c;
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| 162 | }
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| 163 | }
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| 164 | }
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