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openssl/crypto/param_build.c

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/*
* Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
* Copyright (c) 2019, Oracle and/or its affiliates. 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
*/
#include <string.h>
#include <openssl/err.h>
#include <openssl/cryptoerr.h>
#include <openssl/params.h>
#include <openssl/types.h>
#include <openssl/safestack.h>
#include "internal/cryptlib.h"
#include "openssl/param_build.h"
/*
* Special internal param type to indicate the end of an allocate OSSL_PARAM
* array.
*/
#define OSSL_PARAM_ALLOCATED_END 127
typedef struct {
const char *key;
int type;
int secure;
size_t size;
size_t alloc_blocks;
const BIGNUM *bn;
const void *string;
union {
/*
* These fields are never directly addressed, but their sizes are
* imporant so that all native types can be copied here without overrun.
*/
ossl_intmax_t i;
ossl_uintmax_t u;
double d;
} num;
} OSSL_PARAM_BLD_DEF;
DEFINE_STACK_OF(OSSL_PARAM_BLD_DEF)
struct ossl_param_bld_st {
size_t total_blocks;
size_t secure_blocks;
STACK_OF(OSSL_PARAM_BLD_DEF) *params;
};
typedef union {
OSSL_UNION_ALIGN;
} OSSL_PARAM_BLD_BLOCK;
#define ALIGN_SIZE sizeof(OSSL_PARAM_BLD_BLOCK)
static size_t bytes_to_blocks(size_t bytes)
{
return (bytes + ALIGN_SIZE - 1) / ALIGN_SIZE;
}
static OSSL_PARAM_BLD_DEF *param_push(OSSL_PARAM_BLD *bld, const char *key,
int size, size_t alloc, int type,
int secure)
{
OSSL_PARAM_BLD_DEF *pd = OPENSSL_zalloc(sizeof(*pd));
if (pd == NULL) {
CRYPTOerr(CRYPTO_F_PARAM_PUSH, ERR_R_MALLOC_FAILURE);
return NULL;
}
pd->key = key;
pd->type = type;
pd->size = size;
pd->alloc_blocks = bytes_to_blocks(size);
if ((pd->secure = secure) != 0)
bld->secure_blocks += pd->alloc_blocks;
else
bld->total_blocks += pd->alloc_blocks;
if (sk_OSSL_PARAM_BLD_DEF_push(bld->params, pd) <= 0) {
OPENSSL_free(pd);
pd = NULL;
}
return pd;
}
static int param_push_num(OSSL_PARAM_BLD *bld, const char *key,
void *num, size_t size, int type)
{
OSSL_PARAM_BLD_DEF *pd = param_push(bld, key, size, size, type, 0);
if (pd == NULL)
return 0;
if (size > sizeof(pd->num)) {
CRYPTOerr(CRYPTO_F_PARAM_PUSH_NUM, CRYPTO_R_TOO_MANY_BYTES);
return 0;
}
memcpy(&pd->num, num, size);
return 1;
}
OSSL_PARAM_BLD *OSSL_PARAM_BLD_new(void)
{
OSSL_PARAM_BLD *r = OPENSSL_zalloc(sizeof(OSSL_PARAM_BLD));
if (r != NULL) {
r->params = sk_OSSL_PARAM_BLD_DEF_new_null();
if (r->params == NULL) {
OPENSSL_free(r);
r = NULL;
}
}
return r;
}
static void free_all_params(OSSL_PARAM_BLD *bld)
{
int i, n = sk_OSSL_PARAM_BLD_DEF_num(bld->params);
for (i = 0; i < n; i++)
OPENSSL_free(sk_OSSL_PARAM_BLD_DEF_pop(bld->params));
}
void OSSL_PARAM_BLD_free(OSSL_PARAM_BLD *bld)
{
if (bld == NULL)
return;
free_all_params(bld);
sk_OSSL_PARAM_BLD_DEF_free(bld->params);
OPENSSL_free(bld);
}
int OSSL_PARAM_BLD_push_int(OSSL_PARAM_BLD *bld, const char *key, int num)
{
return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
}
int OSSL_PARAM_BLD_push_uint(OSSL_PARAM_BLD *bld, const char *key,
unsigned int num)
{
return param_push_num(bld, key, &num, sizeof(num),
OSSL_PARAM_UNSIGNED_INTEGER);
}
int OSSL_PARAM_BLD_push_long(OSSL_PARAM_BLD *bld, const char *key,
long int num)
{
return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
}
int OSSL_PARAM_BLD_push_ulong(OSSL_PARAM_BLD *bld, const char *key,
unsigned long int num)
{
return param_push_num(bld, key, &num, sizeof(num),
OSSL_PARAM_UNSIGNED_INTEGER);
}
int OSSL_PARAM_BLD_push_int32(OSSL_PARAM_BLD *bld, const char *key,
int32_t num)
{
return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
}
int OSSL_PARAM_BLD_push_uint32(OSSL_PARAM_BLD *bld, const char *key,
uint32_t num)
{
return param_push_num(bld, key, &num, sizeof(num),
OSSL_PARAM_UNSIGNED_INTEGER);
}
int OSSL_PARAM_BLD_push_int64(OSSL_PARAM_BLD *bld, const char *key,
int64_t num)
{
return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
}
int OSSL_PARAM_BLD_push_uint64(OSSL_PARAM_BLD *bld, const char *key,
uint64_t num)
{
return param_push_num(bld, key, &num, sizeof(num),
OSSL_PARAM_UNSIGNED_INTEGER);
}
int OSSL_PARAM_BLD_push_size_t(OSSL_PARAM_BLD *bld, const char *key,
size_t num)
{
return param_push_num(bld, key, &num, sizeof(num),
OSSL_PARAM_UNSIGNED_INTEGER);
}
int OSSL_PARAM_BLD_push_double(OSSL_PARAM_BLD *bld, const char *key,
double num)
{
return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_REAL);
}
int OSSL_PARAM_BLD_push_BN(OSSL_PARAM_BLD *bld, const char *key,
const BIGNUM *bn)
{
return OSSL_PARAM_BLD_push_BN_pad(bld, key, bn,
bn == NULL ? 0 : BN_num_bytes(bn));
}
int OSSL_PARAM_BLD_push_BN_pad(OSSL_PARAM_BLD *bld, const char *key,
const BIGNUM *bn, size_t sz)
{
int n, secure = 0;
OSSL_PARAM_BLD_DEF *pd;
if (bn != NULL) {
n = BN_num_bytes(bn);
if (n < 0) {
CRYPTOerr(0, CRYPTO_R_ZERO_LENGTH_NUMBER);
return 0;
}
if (sz < (size_t)n) {
CRYPTOerr(0, CRYPTO_R_TOO_SMALL_BUFFER);
return 0;
}
if (BN_get_flags(bn, BN_FLG_SECURE) == BN_FLG_SECURE)
secure = 1;
}
pd = param_push(bld, key, sz, sz, OSSL_PARAM_UNSIGNED_INTEGER, secure);
if (pd == NULL)
return 0;
pd->bn = bn;
return 1;
}
int OSSL_PARAM_BLD_push_utf8_string(OSSL_PARAM_BLD *bld, const char *key,
const char *buf, size_t bsize)
{
OSSL_PARAM_BLD_DEF *pd;
if (bsize == 0) {
bsize = strlen(buf) + 1;
} else if (bsize > INT_MAX) {
CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_PUSH_UTF8_STRING,
CRYPTO_R_STRING_TOO_LONG);
return 0;
}
pd = param_push(bld, key, bsize, bsize, OSSL_PARAM_UTF8_STRING, 0);
if (pd == NULL)
return 0;
pd->string = buf;
return 1;
}
int OSSL_PARAM_BLD_push_utf8_ptr(OSSL_PARAM_BLD *bld, const char *key,
char *buf, size_t bsize)
{
OSSL_PARAM_BLD_DEF *pd;
if (bsize == 0) {
bsize = strlen(buf) + 1;
} else if (bsize > INT_MAX) {
CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_PUSH_UTF8_PTR,
CRYPTO_R_STRING_TOO_LONG);
return 0;
}
pd = param_push(bld, key, bsize, sizeof(buf), OSSL_PARAM_UTF8_PTR, 0);
if (pd == NULL)
return 0;
pd->string = buf;
return 1;
}
int OSSL_PARAM_BLD_push_octet_string(OSSL_PARAM_BLD *bld, const char *key,
const void *buf, size_t bsize)
{
OSSL_PARAM_BLD_DEF *pd;
if (bsize > INT_MAX) {
CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_PUSH_OCTET_STRING,
CRYPTO_R_STRING_TOO_LONG);
return 0;
}
pd = param_push(bld, key, bsize, bsize, OSSL_PARAM_OCTET_STRING, 0);
if (pd == NULL)
return 0;
pd->string = buf;
return 1;
}
int OSSL_PARAM_BLD_push_octet_ptr(OSSL_PARAM_BLD *bld, const char *key,
void *buf, size_t bsize)
{
OSSL_PARAM_BLD_DEF *pd;
if (bsize > INT_MAX) {
CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_PUSH_OCTET_PTR,
CRYPTO_R_STRING_TOO_LONG);
return 0;
}
pd = param_push(bld, key, bsize, sizeof(buf), OSSL_PARAM_OCTET_PTR, 0);
if (pd == NULL)
return 0;
pd->string = buf;
return 1;
}
static OSSL_PARAM *param_bld_convert(OSSL_PARAM_BLD *bld, OSSL_PARAM *param,
OSSL_PARAM_BLD_BLOCK *blk,
OSSL_PARAM_BLD_BLOCK *secure)
{
int i, num = sk_OSSL_PARAM_BLD_DEF_num(bld->params);
OSSL_PARAM_BLD_DEF *pd;
void *p;
for (i = 0; i < num; i++) {
pd = sk_OSSL_PARAM_BLD_DEF_value(bld->params, i);
param[i].key = pd->key;
param[i].data_type = pd->type;
param[i].data_size = pd->size;
param[i].return_size = OSSL_PARAM_UNMODIFIED;
if (pd->secure) {
p = secure;
secure += pd->alloc_blocks;
} else {
p = blk;
blk += pd->alloc_blocks;
}
param[i].data = p;
if (pd->bn != NULL) {
/* BIGNUM */
BN_bn2nativepad(pd->bn, (unsigned char *)p, pd->size);
} else if (pd->type == OSSL_PARAM_OCTET_PTR
|| pd->type == OSSL_PARAM_UTF8_PTR) {
/* PTR */
*(const void **)p = pd->string;
} else if (pd->type == OSSL_PARAM_OCTET_STRING
|| pd->type == OSSL_PARAM_UTF8_STRING) {
if (pd->string != NULL)
memcpy(p, pd->string, pd->size);
else
memset(p, 0, pd->size);
} else {
/* Number, but could also be a NULL BIGNUM */
if (pd->size > sizeof(pd->num))
memset(p, 0, pd->size);
else if (pd->size > 0)
memcpy(p, &pd->num, pd->size);
}
}
param[i] = OSSL_PARAM_construct_end();
return param + i;
}
OSSL_PARAM *OSSL_PARAM_BLD_to_param(OSSL_PARAM_BLD *bld)
{
OSSL_PARAM_BLD_BLOCK *blk, *s = NULL;
OSSL_PARAM *params, *last;
const int num = sk_OSSL_PARAM_BLD_DEF_num(bld->params);
const size_t p_blks = bytes_to_blocks((1 + num) * sizeof(*params));
const size_t total = ALIGN_SIZE * (p_blks + bld->total_blocks);
const size_t ss = ALIGN_SIZE * bld->secure_blocks;
if (ss > 0) {
s = OPENSSL_secure_malloc(ss);
if (s == NULL) {
CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_TO_PARAM,
CRYPTO_R_SECURE_MALLOC_FAILURE);
return NULL;
}
}
params = OPENSSL_malloc(total);
if (params == NULL) {
CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_TO_PARAM, ERR_R_MALLOC_FAILURE);
OPENSSL_secure_free(s);
return NULL;
}
blk = p_blks + (OSSL_PARAM_BLD_BLOCK *)(params);
last = param_bld_convert(bld, params, blk, s);
last->data_size = ss;
last->data = s;
last->data_type = OSSL_PARAM_ALLOCATED_END;
/* Reset builder for reuse */
bld->total_blocks = 0;
bld->secure_blocks = 0;
free_all_params(bld);
return params;
}
void OSSL_PARAM_BLD_free_params(OSSL_PARAM *params)
{
if (params != NULL) {
OSSL_PARAM *p;
for (p = params; p->key != NULL; p++)
;
if (p->data_type == OSSL_PARAM_ALLOCATED_END)
OPENSSL_secure_clear_free(p->data, p->data_size);
OPENSSL_free(params);
}
}
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