0c5d725ebf
`RSA_free()` and friends are called in case of error from `RSA_new_method(ENGINE *e)` (or the respective equivalent functions). For the rest of the description I'll talk about `RSA_*`, but the same applies for the equivalent `DSA_free()`, `DH_free()`, `EC_KEY_free()`. If `RSA_new_method()` fails because the engine does not implement the required method, when `RSA_free(RSA *r)` is called, `r->meth == NULL` and a segfault happens while checking if `r->meth->finish` is defined. This commit fixes this issue by ensuring that `r->meth` is not NULL before dereferencing it to check for `r->meth->finish`. Fixes #7102 . Reviewed-by: Richard Levitte <levitte@openssl.org> Reviewed-by: Tim Hudson <tjh@openssl.org> Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com> Reviewed-by: Paul Dale <paul.dale@oracle.com> (Merged from https://github.com/openssl/openssl/pull/7121)
618 lines
16 KiB
C
618 lines
16 KiB
C
/*
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* Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.
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* Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
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*
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* Licensed under the OpenSSL license (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 "internal/cryptlib.h"
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#include <string.h>
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#include "ec_lcl.h"
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#include "internal/refcount.h"
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#include <openssl/err.h>
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#include <openssl/engine.h>
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EC_KEY *EC_KEY_new(void)
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{
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return EC_KEY_new_method(NULL);
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}
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EC_KEY *EC_KEY_new_by_curve_name(int nid)
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{
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EC_KEY *ret = EC_KEY_new();
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if (ret == NULL)
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return NULL;
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ret->group = EC_GROUP_new_by_curve_name(nid);
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if (ret->group == NULL) {
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EC_KEY_free(ret);
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return NULL;
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}
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if (ret->meth->set_group != NULL
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&& ret->meth->set_group(ret, ret->group) == 0) {
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EC_KEY_free(ret);
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return NULL;
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}
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return ret;
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}
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void EC_KEY_free(EC_KEY *r)
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{
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int i;
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if (r == NULL)
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return;
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CRYPTO_DOWN_REF(&r->references, &i, r->lock);
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REF_PRINT_COUNT("EC_KEY", r);
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if (i > 0)
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return;
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REF_ASSERT_ISNT(i < 0);
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if (r->meth != NULL && r->meth->finish != NULL)
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r->meth->finish(r);
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#ifndef OPENSSL_NO_ENGINE
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ENGINE_finish(r->engine);
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#endif
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if (r->group && r->group->meth->keyfinish)
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r->group->meth->keyfinish(r);
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CRYPTO_free_ex_data(CRYPTO_EX_INDEX_EC_KEY, r, &r->ex_data);
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CRYPTO_THREAD_lock_free(r->lock);
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EC_GROUP_free(r->group);
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EC_POINT_free(r->pub_key);
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BN_clear_free(r->priv_key);
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OPENSSL_clear_free((void *)r, sizeof(EC_KEY));
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}
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EC_KEY *EC_KEY_copy(EC_KEY *dest, const EC_KEY *src)
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{
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if (dest == NULL || src == NULL) {
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ECerr(EC_F_EC_KEY_COPY, ERR_R_PASSED_NULL_PARAMETER);
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return NULL;
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}
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if (src->meth != dest->meth) {
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if (dest->meth->finish != NULL)
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dest->meth->finish(dest);
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if (dest->group && dest->group->meth->keyfinish)
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dest->group->meth->keyfinish(dest);
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#ifndef OPENSSL_NO_ENGINE
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if (ENGINE_finish(dest->engine) == 0)
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return 0;
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dest->engine = NULL;
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#endif
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}
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/* copy the parameters */
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if (src->group != NULL) {
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const EC_METHOD *meth = EC_GROUP_method_of(src->group);
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/* clear the old group */
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EC_GROUP_free(dest->group);
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dest->group = EC_GROUP_new(meth);
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if (dest->group == NULL)
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return NULL;
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if (!EC_GROUP_copy(dest->group, src->group))
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return NULL;
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/* copy the public key */
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if (src->pub_key != NULL) {
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EC_POINT_free(dest->pub_key);
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dest->pub_key = EC_POINT_new(src->group);
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if (dest->pub_key == NULL)
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return NULL;
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if (!EC_POINT_copy(dest->pub_key, src->pub_key))
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return NULL;
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}
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/* copy the private key */
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if (src->priv_key != NULL) {
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if (dest->priv_key == NULL) {
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dest->priv_key = BN_new();
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if (dest->priv_key == NULL)
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return NULL;
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}
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if (!BN_copy(dest->priv_key, src->priv_key))
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return NULL;
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if (src->group->meth->keycopy
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&& src->group->meth->keycopy(dest, src) == 0)
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return NULL;
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}
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}
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/* copy the rest */
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dest->enc_flag = src->enc_flag;
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dest->conv_form = src->conv_form;
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dest->version = src->version;
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dest->flags = src->flags;
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if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_EC_KEY,
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&dest->ex_data, &src->ex_data))
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return NULL;
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if (src->meth != dest->meth) {
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#ifndef OPENSSL_NO_ENGINE
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if (src->engine != NULL && ENGINE_init(src->engine) == 0)
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return NULL;
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dest->engine = src->engine;
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#endif
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dest->meth = src->meth;
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}
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if (src->meth->copy != NULL && src->meth->copy(dest, src) == 0)
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return NULL;
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return dest;
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}
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EC_KEY *EC_KEY_dup(const EC_KEY *ec_key)
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{
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EC_KEY *ret = EC_KEY_new_method(ec_key->engine);
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if (ret == NULL)
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return NULL;
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if (EC_KEY_copy(ret, ec_key) == NULL) {
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EC_KEY_free(ret);
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return NULL;
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}
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return ret;
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}
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int EC_KEY_up_ref(EC_KEY *r)
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{
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int i;
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if (CRYPTO_UP_REF(&r->references, &i, r->lock) <= 0)
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return 0;
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REF_PRINT_COUNT("EC_KEY", r);
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REF_ASSERT_ISNT(i < 2);
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return ((i > 1) ? 1 : 0);
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}
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ENGINE *EC_KEY_get0_engine(const EC_KEY *eckey)
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{
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return eckey->engine;
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}
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int EC_KEY_generate_key(EC_KEY *eckey)
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{
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if (eckey == NULL || eckey->group == NULL) {
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ECerr(EC_F_EC_KEY_GENERATE_KEY, ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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if (eckey->meth->keygen != NULL)
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return eckey->meth->keygen(eckey);
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ECerr(EC_F_EC_KEY_GENERATE_KEY, EC_R_OPERATION_NOT_SUPPORTED);
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return 0;
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}
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int ossl_ec_key_gen(EC_KEY *eckey)
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{
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return eckey->group->meth->keygen(eckey);
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}
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int ec_key_simple_generate_key(EC_KEY *eckey)
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{
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int ok = 0;
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BN_CTX *ctx = NULL;
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BIGNUM *priv_key = NULL;
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const BIGNUM *order = NULL;
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EC_POINT *pub_key = NULL;
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if ((ctx = BN_CTX_new()) == NULL)
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goto err;
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if (eckey->priv_key == NULL) {
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priv_key = BN_new();
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if (priv_key == NULL)
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goto err;
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} else
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priv_key = eckey->priv_key;
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order = EC_GROUP_get0_order(eckey->group);
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if (order == NULL)
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goto err;
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do
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if (!BN_priv_rand_range(priv_key, order))
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goto err;
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while (BN_is_zero(priv_key)) ;
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if (eckey->pub_key == NULL) {
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pub_key = EC_POINT_new(eckey->group);
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if (pub_key == NULL)
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goto err;
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} else
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pub_key = eckey->pub_key;
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if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx))
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goto err;
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eckey->priv_key = priv_key;
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eckey->pub_key = pub_key;
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ok = 1;
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err:
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if (eckey->pub_key == NULL)
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EC_POINT_free(pub_key);
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if (eckey->priv_key != priv_key)
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BN_free(priv_key);
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BN_CTX_free(ctx);
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return ok;
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}
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int ec_key_simple_generate_public_key(EC_KEY *eckey)
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{
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return EC_POINT_mul(eckey->group, eckey->pub_key, eckey->priv_key, NULL,
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NULL, NULL);
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}
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int EC_KEY_check_key(const EC_KEY *eckey)
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{
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if (eckey == NULL || eckey->group == NULL || eckey->pub_key == NULL) {
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ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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if (eckey->group->meth->keycheck == NULL) {
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ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
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return 0;
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}
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return eckey->group->meth->keycheck(eckey);
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}
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int ec_key_simple_check_key(const EC_KEY *eckey)
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{
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int ok = 0;
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BN_CTX *ctx = NULL;
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const BIGNUM *order = NULL;
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EC_POINT *point = NULL;
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if (eckey == NULL || eckey->group == NULL || eckey->pub_key == NULL) {
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ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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if (EC_POINT_is_at_infinity(eckey->group, eckey->pub_key)) {
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ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_POINT_AT_INFINITY);
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goto err;
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}
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if ((ctx = BN_CTX_new()) == NULL)
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goto err;
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if ((point = EC_POINT_new(eckey->group)) == NULL)
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goto err;
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/* testing whether the pub_key is on the elliptic curve */
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if (EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx) <= 0) {
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ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_POINT_IS_NOT_ON_CURVE);
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goto err;
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}
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/* testing whether pub_key * order is the point at infinity */
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order = eckey->group->order;
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if (BN_is_zero(order)) {
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ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_INVALID_GROUP_ORDER);
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goto err;
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}
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if (!EC_POINT_mul(eckey->group, point, NULL, eckey->pub_key, order, ctx)) {
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ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, ERR_R_EC_LIB);
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goto err;
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}
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if (!EC_POINT_is_at_infinity(eckey->group, point)) {
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ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_WRONG_ORDER);
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goto err;
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}
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/*
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* in case the priv_key is present : check if generator * priv_key ==
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* pub_key
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*/
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if (eckey->priv_key != NULL) {
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if (BN_cmp(eckey->priv_key, order) >= 0) {
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ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_WRONG_ORDER);
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goto err;
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}
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if (!EC_POINT_mul(eckey->group, point, eckey->priv_key,
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NULL, NULL, ctx)) {
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ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, ERR_R_EC_LIB);
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goto err;
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}
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if (EC_POINT_cmp(eckey->group, point, eckey->pub_key, ctx) != 0) {
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ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_INVALID_PRIVATE_KEY);
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goto err;
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}
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}
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ok = 1;
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err:
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BN_CTX_free(ctx);
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EC_POINT_free(point);
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return ok;
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}
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int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x,
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BIGNUM *y)
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{
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BN_CTX *ctx = NULL;
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BIGNUM *tx, *ty;
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EC_POINT *point = NULL;
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int ok = 0;
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if (key == NULL || key->group == NULL || x == NULL || y == NULL) {
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ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES,
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ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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ctx = BN_CTX_new();
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if (ctx == NULL)
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return 0;
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BN_CTX_start(ctx);
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point = EC_POINT_new(key->group);
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if (point == NULL)
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goto err;
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tx = BN_CTX_get(ctx);
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ty = BN_CTX_get(ctx);
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if (ty == NULL)
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goto err;
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if (!EC_POINT_set_affine_coordinates(key->group, point, x, y, ctx))
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goto err;
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if (!EC_POINT_get_affine_coordinates(key->group, point, tx, ty, ctx))
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goto err;
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/*
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* Check if retrieved coordinates match originals and are less than field
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* order: if not values are out of range.
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*/
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if (BN_cmp(x, tx) || BN_cmp(y, ty)
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|| (BN_cmp(x, key->group->field) >= 0)
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|| (BN_cmp(y, key->group->field) >= 0)) {
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ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES,
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EC_R_COORDINATES_OUT_OF_RANGE);
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goto err;
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}
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if (!EC_KEY_set_public_key(key, point))
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goto err;
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if (EC_KEY_check_key(key) == 0)
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goto err;
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ok = 1;
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err:
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BN_CTX_end(ctx);
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BN_CTX_free(ctx);
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EC_POINT_free(point);
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return ok;
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}
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const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key)
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{
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return key->group;
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}
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int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group)
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{
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if (key->meth->set_group != NULL && key->meth->set_group(key, group) == 0)
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return 0;
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EC_GROUP_free(key->group);
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key->group = EC_GROUP_dup(group);
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return (key->group == NULL) ? 0 : 1;
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}
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const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key)
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{
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return key->priv_key;
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}
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int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *priv_key)
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{
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if (key->group == NULL || key->group->meth == NULL)
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return 0;
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if (key->group->meth->set_private != NULL
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&& key->group->meth->set_private(key, priv_key) == 0)
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return 0;
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if (key->meth->set_private != NULL
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&& key->meth->set_private(key, priv_key) == 0)
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return 0;
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BN_clear_free(key->priv_key);
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key->priv_key = BN_dup(priv_key);
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return (key->priv_key == NULL) ? 0 : 1;
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}
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const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key)
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{
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return key->pub_key;
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}
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int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub_key)
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{
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if (key->meth->set_public != NULL
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&& key->meth->set_public(key, pub_key) == 0)
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return 0;
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EC_POINT_free(key->pub_key);
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key->pub_key = EC_POINT_dup(pub_key, key->group);
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return (key->pub_key == NULL) ? 0 : 1;
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}
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unsigned int EC_KEY_get_enc_flags(const EC_KEY *key)
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{
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return key->enc_flag;
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}
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void EC_KEY_set_enc_flags(EC_KEY *key, unsigned int flags)
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{
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key->enc_flag = flags;
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}
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point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key)
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{
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return key->conv_form;
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}
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void EC_KEY_set_conv_form(EC_KEY *key, point_conversion_form_t cform)
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{
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key->conv_form = cform;
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if (key->group != NULL)
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EC_GROUP_set_point_conversion_form(key->group, cform);
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}
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void EC_KEY_set_asn1_flag(EC_KEY *key, int flag)
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{
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if (key->group != NULL)
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EC_GROUP_set_asn1_flag(key->group, flag);
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}
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int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx)
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{
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if (key->group == NULL)
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return 0;
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return EC_GROUP_precompute_mult(key->group, ctx);
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}
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int EC_KEY_get_flags(const EC_KEY *key)
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{
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return key->flags;
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}
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void EC_KEY_set_flags(EC_KEY *key, int flags)
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{
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key->flags |= flags;
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}
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void EC_KEY_clear_flags(EC_KEY *key, int flags)
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{
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key->flags &= ~flags;
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}
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size_t EC_KEY_key2buf(const EC_KEY *key, point_conversion_form_t form,
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unsigned char **pbuf, BN_CTX *ctx)
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{
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if (key == NULL || key->pub_key == NULL || key->group == NULL)
|
|
return 0;
|
|
return EC_POINT_point2buf(key->group, key->pub_key, form, pbuf, ctx);
|
|
}
|
|
|
|
int EC_KEY_oct2key(EC_KEY *key, const unsigned char *buf, size_t len,
|
|
BN_CTX *ctx)
|
|
{
|
|
if (key == NULL || key->group == NULL)
|
|
return 0;
|
|
if (key->pub_key == NULL)
|
|
key->pub_key = EC_POINT_new(key->group);
|
|
if (key->pub_key == NULL)
|
|
return 0;
|
|
if (EC_POINT_oct2point(key->group, key->pub_key, buf, len, ctx) == 0)
|
|
return 0;
|
|
/*
|
|
* Save the point conversion form.
|
|
* For non-custom curves the first octet of the buffer (excluding
|
|
* the last significant bit) contains the point conversion form.
|
|
* EC_POINT_oct2point() has already performed sanity checking of
|
|
* the buffer so we know it is valid.
|
|
*/
|
|
if ((key->group->meth->flags & EC_FLAGS_CUSTOM_CURVE) == 0)
|
|
key->conv_form = (point_conversion_form_t)(buf[0] & ~0x01);
|
|
return 1;
|
|
}
|
|
|
|
size_t EC_KEY_priv2oct(const EC_KEY *eckey,
|
|
unsigned char *buf, size_t len)
|
|
{
|
|
if (eckey->group == NULL || eckey->group->meth == NULL)
|
|
return 0;
|
|
if (eckey->group->meth->priv2oct == NULL) {
|
|
ECerr(EC_F_EC_KEY_PRIV2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
|
|
return 0;
|
|
}
|
|
|
|
return eckey->group->meth->priv2oct(eckey, buf, len);
|
|
}
|
|
|
|
size_t ec_key_simple_priv2oct(const EC_KEY *eckey,
|
|
unsigned char *buf, size_t len)
|
|
{
|
|
size_t buf_len;
|
|
|
|
buf_len = (EC_GROUP_order_bits(eckey->group) + 7) / 8;
|
|
if (eckey->priv_key == NULL)
|
|
return 0;
|
|
if (buf == NULL)
|
|
return buf_len;
|
|
else if (len < buf_len)
|
|
return 0;
|
|
|
|
/* Octetstring may need leading zeros if BN is to short */
|
|
|
|
if (BN_bn2binpad(eckey->priv_key, buf, buf_len) == -1) {
|
|
ECerr(EC_F_EC_KEY_SIMPLE_PRIV2OCT, EC_R_BUFFER_TOO_SMALL);
|
|
return 0;
|
|
}
|
|
|
|
return buf_len;
|
|
}
|
|
|
|
int EC_KEY_oct2priv(EC_KEY *eckey, const unsigned char *buf, size_t len)
|
|
{
|
|
if (eckey->group == NULL || eckey->group->meth == NULL)
|
|
return 0;
|
|
if (eckey->group->meth->oct2priv == NULL) {
|
|
ECerr(EC_F_EC_KEY_OCT2PRIV, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
|
|
return 0;
|
|
}
|
|
return eckey->group->meth->oct2priv(eckey, buf, len);
|
|
}
|
|
|
|
int ec_key_simple_oct2priv(EC_KEY *eckey, const unsigned char *buf, size_t len)
|
|
{
|
|
if (eckey->priv_key == NULL)
|
|
eckey->priv_key = BN_secure_new();
|
|
if (eckey->priv_key == NULL) {
|
|
ECerr(EC_F_EC_KEY_SIMPLE_OCT2PRIV, ERR_R_MALLOC_FAILURE);
|
|
return 0;
|
|
}
|
|
eckey->priv_key = BN_bin2bn(buf, len, eckey->priv_key);
|
|
if (eckey->priv_key == NULL) {
|
|
ECerr(EC_F_EC_KEY_SIMPLE_OCT2PRIV, ERR_R_BN_LIB);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
size_t EC_KEY_priv2buf(const EC_KEY *eckey, unsigned char **pbuf)
|
|
{
|
|
size_t len;
|
|
unsigned char *buf;
|
|
|
|
len = EC_KEY_priv2oct(eckey, NULL, 0);
|
|
if (len == 0)
|
|
return 0;
|
|
if ((buf = OPENSSL_malloc(len)) == NULL) {
|
|
ECerr(EC_F_EC_KEY_PRIV2BUF, ERR_R_MALLOC_FAILURE);
|
|
return 0;
|
|
}
|
|
len = EC_KEY_priv2oct(eckey, buf, len);
|
|
if (len == 0) {
|
|
OPENSSL_free(buf);
|
|
return 0;
|
|
}
|
|
*pbuf = buf;
|
|
return len;
|
|
}
|
|
|
|
int EC_KEY_can_sign(const EC_KEY *eckey)
|
|
{
|
|
if (eckey->group == NULL || eckey->group->meth == NULL
|
|
|| (eckey->group->meth->flags & EC_FLAGS_NO_SIGN))
|
|
return 0;
|
|
return 1;
|
|
}
|