mirror of
https://github.com/openssl/openssl.git
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242 lines
7.4 KiB
C
242 lines
7.4 KiB
C
/*
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* Copyright 2021-2022 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <string.h>
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#include <openssl/params.h>
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#include <openssl/param_build.h>
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#include "internal/param_build_set.h"
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#define OSSL_PARAM_ALLOCATED_END 127
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#define OSSL_PARAM_MERGE_LIST_MAX 128
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#define OSSL_PARAM_BUF_PUBLIC 0
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#define OSSL_PARAM_BUF_SECURE 1
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#define OSSL_PARAM_BUF_MAX (OSSL_PARAM_BUF_SECURE + 1)
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typedef struct {
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OSSL_PARAM_ALIGNED_BLOCK *alloc; /* The allocated buffer */
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OSSL_PARAM_ALIGNED_BLOCK *cur; /* Current position in the allocated buf */
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size_t blocks; /* Number of aligned blocks */
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size_t alloc_sz; /* The size of the allocated buffer (in bytes) */
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} OSSL_PARAM_BUF;
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size_t ossl_param_bytes_to_blocks(size_t bytes)
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{
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return (bytes + OSSL_PARAM_ALIGN_SIZE - 1) / OSSL_PARAM_ALIGN_SIZE;
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}
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static int ossl_param_buf_alloc(OSSL_PARAM_BUF *out, size_t extra_blocks,
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int is_secure)
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{
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size_t sz = OSSL_PARAM_ALIGN_SIZE * (extra_blocks + out->blocks);
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out->alloc = is_secure ? OPENSSL_secure_zalloc(sz) : OPENSSL_zalloc(sz);
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if (out->alloc == NULL) {
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ERR_raise(ERR_LIB_CRYPTO, is_secure ? CRYPTO_R_SECURE_MALLOC_FAILURE
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: ERR_R_MALLOC_FAILURE);
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return 0;
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}
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out->alloc_sz = sz;
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out->cur = out->alloc + extra_blocks;
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return 1;
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}
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void ossl_param_set_secure_block(OSSL_PARAM *last, void *secure_buffer,
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size_t secure_buffer_sz)
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{
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last->key = NULL;
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last->data_size = secure_buffer_sz;
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last->data = secure_buffer;
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last->data_type = OSSL_PARAM_ALLOCATED_END;
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}
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static OSSL_PARAM *ossl_param_dup(const OSSL_PARAM *src, OSSL_PARAM *dst,
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OSSL_PARAM_BUF buf[OSSL_PARAM_BUF_MAX],
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int *param_count)
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{
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const OSSL_PARAM *in;
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int has_dst = (dst != NULL);
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int is_secure;
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size_t param_sz, blks;
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for (in = src; in->key != NULL; in++) {
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is_secure = CRYPTO_secure_allocated(in->data);
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if (has_dst) {
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*dst = *in;
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dst->data = buf[is_secure].cur;
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}
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if (in->data_type == OSSL_PARAM_OCTET_PTR
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|| in->data_type == OSSL_PARAM_UTF8_PTR) {
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param_sz = sizeof(in->data);
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if (has_dst)
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*((const void **)dst->data) = *(const void **)in->data;
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} else {
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param_sz = in->data_size;
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if (has_dst)
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memcpy(dst->data, in->data, param_sz);
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}
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if (in->data_type == OSSL_PARAM_UTF8_STRING)
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param_sz++; /* NULL terminator */
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blks = ossl_param_bytes_to_blocks(param_sz);
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if (has_dst) {
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dst++;
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buf[is_secure].cur += blks;
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} else {
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buf[is_secure].blocks += blks;
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}
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if (param_count != NULL)
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++*param_count;
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}
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return dst;
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}
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OSSL_PARAM *OSSL_PARAM_dup(const OSSL_PARAM *src)
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{
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size_t param_blocks;
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OSSL_PARAM_BUF buf[OSSL_PARAM_BUF_MAX];
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OSSL_PARAM *last, *dst;
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int param_count = 1; /* Include terminator in the count */
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if (src == NULL) {
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ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
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return NULL;
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}
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memset(buf, 0, sizeof(buf));
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/* First Pass: get the param_count and block sizes required */
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(void)ossl_param_dup(src, NULL, buf, ¶m_count);
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param_blocks = ossl_param_bytes_to_blocks(param_count * sizeof(*src));
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/*
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* The allocated buffer consists of an array of OSSL_PARAM followed by
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* aligned data bytes that the array elements will point to.
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*/
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if (!ossl_param_buf_alloc(&buf[OSSL_PARAM_BUF_PUBLIC], param_blocks, 0))
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return NULL;
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/* Allocate a secure memory buffer if required */
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if (buf[OSSL_PARAM_BUF_SECURE].blocks > 0
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&& !ossl_param_buf_alloc(&buf[OSSL_PARAM_BUF_SECURE], 0, 1)) {
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OPENSSL_free(buf[OSSL_PARAM_BUF_PUBLIC].alloc);
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return NULL;
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}
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dst = (OSSL_PARAM *)buf[OSSL_PARAM_BUF_PUBLIC].alloc;
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last = ossl_param_dup(src, dst, buf, NULL);
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/* Store the allocated secure memory buffer in the last param block */
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ossl_param_set_secure_block(last, buf[OSSL_PARAM_BUF_SECURE].alloc,
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buf[OSSL_PARAM_BUF_SECURE].alloc_sz);
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return dst;
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}
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static int compare_params(const void *left, const void *right)
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{
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const OSSL_PARAM *l = *(const OSSL_PARAM **)left;
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const OSSL_PARAM *r = *(const OSSL_PARAM **)right;
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return OPENSSL_strcasecmp(l->key, r->key);
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}
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OSSL_PARAM *OSSL_PARAM_merge(const OSSL_PARAM *p1, const OSSL_PARAM *p2)
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{
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const OSSL_PARAM *list1[OSSL_PARAM_MERGE_LIST_MAX + 1];
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const OSSL_PARAM *list2[OSSL_PARAM_MERGE_LIST_MAX + 1];
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const OSSL_PARAM *p = NULL;
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const OSSL_PARAM **p1cur, **p2cur;
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OSSL_PARAM *params, *dst;
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size_t list1_sz = 0, list2_sz = 0;
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int diff;
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if (p1 == NULL && p2 == NULL) {
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ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
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return NULL;
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}
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/* Copy p1 to list1 */
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if (p1 != NULL) {
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for (p = p1; p->key != NULL && list1_sz < OSSL_PARAM_MERGE_LIST_MAX; p++)
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list1[list1_sz++] = p;
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}
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list1[list1_sz] = NULL;
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/* copy p2 to a list2 */
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if (p2 != NULL) {
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for (p = p2; p->key != NULL && list2_sz < OSSL_PARAM_MERGE_LIST_MAX; p++)
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list2[list2_sz++] = p;
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}
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list2[list2_sz] = NULL;
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if (list1_sz == 0 && list2_sz == 0) {
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ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_NO_PARAMS_TO_MERGE);
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return NULL;
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}
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/* Sort the 2 lists */
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qsort(list1, list1_sz, sizeof(OSSL_PARAM *), compare_params);
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qsort(list2, list2_sz, sizeof(OSSL_PARAM *), compare_params);
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/* Allocate enough space to store the merged parameters */
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params = OPENSSL_zalloc((list1_sz + list2_sz + 1) * sizeof(*p1));
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if (params == NULL) {
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ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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dst = params;
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p1cur = list1;
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p2cur = list2;
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while (1) {
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/* If list1 is finished just tack list2 onto the end */
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if (*p1cur == NULL) {
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do {
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*dst++ = **p2cur;
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p2cur++;
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} while (*p2cur != NULL);
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break;
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}
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/* If list2 is finished just tack list1 onto the end */
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if (*p2cur == NULL) {
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do {
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*dst++ = **p1cur;
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p1cur++;
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} while (*p1cur != NULL);
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break;
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}
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/* consume the list element with the smaller key */
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diff = OPENSSL_strcasecmp((*p1cur)->key, (*p2cur)->key);
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if (diff == 0) {
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/* If the keys are the same then throw away the list1 element */
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*dst++ = **p2cur;
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p2cur++;
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p1cur++;
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} else if (diff > 0) {
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*dst++ = **p2cur;
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p2cur++;
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} else {
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*dst++ = **p1cur;
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p1cur++;
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}
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}
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return params;
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}
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void OSSL_PARAM_free(OSSL_PARAM *params)
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{
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if (params != NULL) {
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OSSL_PARAM *p;
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for (p = params; p->key != NULL; p++)
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;
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if (p->data_type == OSSL_PARAM_ALLOCATED_END)
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OPENSSL_secure_clear_free(p->data, p->data_size);
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OPENSSL_free(params);
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}
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}
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